CN107888150B - Power amplification circuit and method for audio signal and terminal equipment - Google Patents

Abstract

The embodiment of the application discloses a power amplification circuit and method of an audio signal and terminal equipment, relates to the technical field of terminals, and can reduce power loss while resisting interference, so that amplification efficiency in the audio signal amplification process is improved. The specific scheme is as follows: the power amplifier is an AB type power amplifier or an A type power amplifier; the input end of the power supply module is used for connecting an audio signal input device; the output end of the power supply module is connected with the power supply end of the power amplifier and used for inputting working voltage to the power amplifier, the absolute value of the working voltage is controlled to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is in a preset range; the input end of the power amplifier is used for being connected with an audio signal input device and used for carrying out power amplification on the audio signal according to the working voltage.

Description

Translated fromChinese

一种音频信号的功率放大电路、方法及终端设备A power amplifier circuit, method and terminal device for audio signal

技术领域technical field

本申请涉及终端技术领域，尤其涉及一种音频信号的功率放大电路、方法及终端设备。The present application relates to the technical field of terminals, and in particular, to a power amplifier circuit, method and terminal device for audio signals.

背景技术Background technique

功率放大电路是一种以输出较大功率为目的的放大电路，它可以驱动负载工作，如扬声器。其中，功率放大电路包括电源模块和功率放大器。电源模块用于整个功率放大电路供电；功率放大器，一般简称“功放”，是一种在给定失真率条件下，能够产生最大功率输出以驱动某一负载的放大器。A power amplifier circuit is an amplifier circuit for the purpose of outputting high power, which can drive loads such as speakers. Wherein, the power amplifier circuit includes a power module and a power amplifier. The power module is used to supply power to the entire power amplifier circuit; the power amplifier, generally referred to as "power amplifier", is an amplifier that can generate the maximum power output to drive a certain load under the condition of a given distortion rate.

目前，功率放大电路采用的功率放大器一般为D类功率放大器和AB类功率放大器。At present, the power amplifiers used in the power amplifier circuit are generally class D power amplifiers and class AB power amplifiers.

其中，D类功率放大器是一种脉冲控制的大电流开关放大器，具有高频率的特点，它的实际效率大约能够达到90％；但是D类功率放大器容易和功率放大器应用的设备上的其他信号产生干扰，从而产生杂音，因而D类功率放大器通常只能布置在靠近扬声器的位置，如此使得功率放大电路在设备中布局具有较大的局限性。Among them, the class D power amplifier is a pulse-controlled high-current switching amplifier, which has the characteristics of high frequency, and its actual efficiency can reach about 90%; but the class D power amplifier is easy to generate with other signals on the power amplifier application equipment. Therefore, the class D power amplifier can usually only be arranged close to the speaker, which makes the layout of the power amplifier circuit in the device have great limitations.

AB类功率放大器是一种抗干扰能力较好的放大器。但其效率较低，在采用AB类功率放大器时，电源模块向AB类功率放大器输入工作电压，以该工作电压产生的能量中的几乎一半能量用于电源模块中的晶体管的发热，剩余的一半能量用于AB类功率放大器对音频信号进行放大，因此AB类功率放大器在对音频信号放大时的实际效率大约只有50％。Class AB power amplifier is a kind of amplifier with better anti-interference ability. However, its efficiency is low. When a class AB power amplifier is used, the power supply module inputs the working voltage to the class AB power amplifier, and almost half of the energy generated by the working voltage is used for the heating of the transistor in the power module, and the remaining half The energy is used by the class AB power amplifier to amplify the audio signal, so the actual efficiency of the class AB power amplifier in amplifying the audio signal is only about 50%.

发明内容SUMMARY OF THE INVENTION

本申请提供一种音频信号的功率放大电路、方法及终端设备，能够在抗干扰的同时，减少功率的损耗，从而提高音频信号放大过程中的放大效率。The present application provides an audio signal power amplifying circuit, method and terminal device, which can reduce power loss while resisting interference, thereby improving the amplification efficiency in the audio signal amplifying process.

为了达到上述目的，本申请采用如下技术方案：In order to achieve the above object, the application adopts the following technical solutions:

本申请的第一方面，提供一种音频信号的功率放大电路，包括：电源模块和功率放大器。其中，功率放大器为AB类功率放大器或A类功率放大器。电源模块的输入端用于连接音频信号输入装置；电源模块的输出端与功率放大器的电源端连接，用于向功率放大器输入工作电压，并根据功率放大器的输出电压控制工作电压的绝对值大于输出电压的绝对值，且工作电压与输出电压之差的绝对值在预设范围内。功率放大器的输入端用于连接音频信号输入装置，用于根据工作电压对音频信号进行功率放大。A first aspect of the present application provides an audio signal power amplifying circuit, including: a power supply module and a power amplifier. The power amplifier is a class AB power amplifier or a class A power amplifier. The input end of the power supply module is used to connect the audio signal input device; the output end of the power supply module is connected to the power supply end of the power amplifier, and is used to input the working voltage to the power amplifier, and control the absolute value of the working voltage to be greater than the output voltage according to the output voltage of the power amplifier. The absolute value of the voltage, and the absolute value of the difference between the working voltage and the output voltage is within the preset range. The input end of the power amplifier is used for connecting an audio signal input device, and is used for power amplifying the audio signal according to the working voltage.

本申请中，由于音频信号的功率放大电路采用的是AB类功率放大器或A类功率放大器，因此具有较好的抗干扰能力；并且，由于电源模块可以通过控制向功率放大器输入的工作电压，使得该工作电压与功率放大器的输出电压之差的绝对值在预设范围内，此时电源模块产生的无用的热功率非常小，因此减少了功率的损耗，从而提高了音频信号放大过程中的放大效率。In this application, since the power amplifier circuit of the audio signal adopts a class AB power amplifier or a class A power amplifier, it has better anti-interference ability; The absolute value of the difference between the working voltage and the output voltage of the power amplifier is within a preset range, and the useless thermal power generated by the power module is very small at this time, thus reducing the power loss, thereby improving the audio signal amplification process. efficiency.

本申请的第二方面，提供一种音频信号的功率放大方法，可以应用于包括电源模块和功率放大器的音频信号的功率放大电路，电源模块的输入端与音频信号输入装置连接，电源模块的输出端与功率放大器的电源端连接，功率放大器的输入端与音频信号输入装置连接。本申请中的音频信号的功率放大方法包括：电源模块向功率放大器输入工作电压，功率放大器为AB类功率放大器或A类功率放大器；电源模块根据功率放大器的输出电压，控制工作电压的绝对值大于输出电压的绝对值，且工作电压与输出电压之差的绝对值在预设范围内，以使得功率放大器根据工作电压对音频信号进行功率放大。A second aspect of the present application provides a power amplifying method for an audio signal, which can be applied to a power amplifying circuit for an audio signal including a power supply module and a power amplifier, the input end of the power supply module is connected to an audio signal input device, and the output of the power supply module The terminal is connected with the power supply terminal of the power amplifier, and the input terminal of the power amplifier is connected with the audio signal input device. The power amplifying method of an audio signal in the present application includes: a power supply module inputs a working voltage to a power amplifier, and the power amplifier is a class AB power amplifier or a class A power amplifier; the power supply module controls the absolute value of the working voltage to be greater than the output voltage of the power amplifier The absolute value of the output voltage, and the absolute value of the difference between the working voltage and the output voltage is within a preset range, so that the power amplifier performs power amplification on the audio signal according to the working voltage.

本申请中，由于音频信号的功率放大电路采用的是AB类功率放大器或A类功率放大器，因此具有较好的抗干扰能力；并且，由于电源模块可以通过控制向功率放大器输入的工作电压，使得该工作电压与功率放大器的输出电压之差的绝对值在预设范围内，此时电源模块产生的无用的热功率非常小，因此减少了功率的损耗，从而提高了音频信号放大过程中的放大效率。In this application, since the power amplifier circuit of the audio signal adopts a class AB power amplifier or a class A power amplifier, it has better anti-interference ability; The absolute value of the difference between the working voltage and the output voltage of the power amplifier is within a preset range, and the useless thermal power generated by the power module is very small at this time, thus reducing the power loss, thereby improving the audio signal amplification process. efficiency.

本申请的第三方面，提供一种终端设备，该终端设备包括：至少一个音频信号输出装置以及如第一方面或第一方面的可能的实现方式中的音频信号的功率放大电路。其中，音频信号的功率放大电路用于驱动至少一个音频信号输出装置，以使得至少一个音频信号输出装置输出放大后的音频信号。A third aspect of the present application provides a terminal device, which includes: at least one audio signal output device and a power amplifying circuit for audio signals as in the first aspect or possible implementations of the first aspect. Wherein, the power amplifying circuit of the audio signal is used to drive at least one audio signal output device, so that the at least one audio signal output device outputs the amplified audio signal.

本申请中，终端设备不仅简化了D类功率放大器的布局，且节省了成本；并且，减少了功率的损耗，从而提高了音频信号放大过程中的放大效率。In the present application, the terminal device not only simplifies the layout of the class D power amplifier, but also saves the cost; and also reduces the power loss, thereby improving the amplification efficiency in the audio signal amplification process.

本申请的第四方面，提供一种音频信号的功率放大的装置，该音频信号的功率放大的装置包括：至少一个音频信号输出装置以及如第一方面或第一方面的可能的实现方式中的音频信号的功率放大电路。A fourth aspect of the present application provides an apparatus for power amplifying an audio signal, the apparatus for amplifying the power of an audio signal includes: at least one audio signal output apparatus and the first aspect or a possible implementation manner of the first aspect. Power amplifier circuit for audio signal.

附图说明Description of drawings

图1为本申请实施例提供的一种音频信号的功率放大电路的组成示意图；1 is a schematic diagram of the composition of a power amplifier circuit for an audio signal provided by an embodiment of the application;

图2为现有技术中的工作电压与输出电压的实例示意图；2 is a schematic diagram of an example of a working voltage and an output voltage in the prior art;

图3为本申请实施例提供的一种工作电压与输出电压的实例示意图；3 is a schematic diagram of an example of a working voltage and an output voltage provided by an embodiment of the present application;

图4为本申请实施例提供的另一种音频信号的功率放大电路的组成示意图；FIG. 4 is a schematic diagram of the composition of another audio signal power amplifying circuit provided by an embodiment of the present application;

图5为本申请实施例提供的一种第一电源支路的组成示意图；FIG. 5 is a schematic diagram of the composition of a first power supply branch according to an embodiment of the present application;

图6为本申请实施例提供的一种第一正弦波信号的实例示意图；6 is a schematic diagram of an example of a first sine wave signal provided by an embodiment of the present application;

图7为本申请实施例提供的一种第一PWM信号的实例示意图；7 is a schematic diagram of an example of a first PWM signal provided by an embodiment of the present application;

图8为本申请实施例提供的一种第二电源支路的组成示意图；FIG. 8 is a schematic diagram of the composition of a second power supply branch according to an embodiment of the present application;

图9为本申请实施例提供的第二正弦波信号的实例示意图；9 is a schematic diagram of an example of a second sine wave signal provided by an embodiment of the present application;

图10为本申请实施例提供的第二PWM信号的实例示意图；10 is a schematic diagram of an example of a second PWM signal provided by an embodiment of the application;

图11为本申请实施例提供的一种电源模块的组成示意图；FIG. 11 is a schematic diagram of the composition of a power module according to an embodiment of the application;

图12为本申请实施例提供的另一种音频信号的功率放大电路的组成示意图；12 is a schematic diagram of the composition of another audio signal power amplifying circuit provided by an embodiment of the application;

图13为本申请实施例提供的一种终端设备的结构示意图；FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

图14为现有技术中的终端设备的实例示意图；14 is a schematic diagram of an example of a terminal device in the prior art;

图15为本申请实施例提供的一种终端设备的实例示意图；FIG. 15 is a schematic diagram of an example of a terminal device provided by an embodiment of the present application;

图16为本申请实施例提供的一种音频信号的功率放大方法的流程图；16 is a flowchart of a method for power amplifying an audio signal provided by an embodiment of the application;

图17为本申请实施例提供的另一种音频信号的功率放大方法的流程图；17 is a flowchart of another audio signal power amplifying method provided by an embodiment of the present application;

图18为本申请实施例提供的另一种音频信号的功率放大方法的流程图。FIG. 18 is a flowchart of another audio signal power amplifying method provided by an embodiment of the present application.

具体实施方式Detailed ways

下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

本申请实施例的说明书和权利要求书中的术语“第一”和“第二”等是用于区别不同的对象，而不是用于描述对象的特定顺序。例如，第一电源支路和第二电源支路等是用于区别不同的电源支路，而不是用于描述操作指令的特定顺序。在本申请实施例的描述中，除非另有说明，“多个”的含义是指两个或两个以上。The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of the objects. For example, the first power supply branch, the second power supply branch, etc. are used to distinguish different power supply branches, but are not used to describe a specific sequence of operation instructions. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "plurality" refers to two or more.

在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

本申请实施例提供一种音频信号的功率放大电路、方法及终端设备，可以在抗干扰的同时，减少功率的损耗，从而提高音频信号放大过程中的放大效率。Embodiments of the present application provide an audio signal power amplifying circuit, method, and terminal device, which can reduce power loss while resisting interference, thereby improving the amplification efficiency in the audio signal amplifying process.

在本申请的第一种实施例中，图1示出了本申请实施例提供的一种音频信号的功率放大电路。如图1所示，该音频信号的功率放大电路1可以包括：电源模块01和功率放大器02。In the first embodiment of the present application, FIG. 1 shows an audio signal power amplifying circuit provided by the embodiment of the present application. As shown in FIG. 1 , the power amplifyingcircuit 1 of the audio signal may include: a power supply module 01 and a power amplifier 02 .

其中，电源模块01的输入端用于连接音频信号输入装置；电源模块01的输出端与功率放大器02的电源端连接，用于向功率放大器02输入工作电压，并根据功率放大器02的输出电压控制工作电压的绝对值大于输出电压的绝对值，且工作电压与输出电压之差的绝对值在预设范围内。The input terminal of the power supply module 01 is used to connect the audio signal input device; the output terminal of the power supply module 01 is connected to the power supply terminal of the power amplifier 02, and is used to input the working voltage to the power amplifier 02 and control the output voltage according to the power amplifier 02. The absolute value of the working voltage is greater than the absolute value of the output voltage, and the absolute value of the difference between the working voltage and the output voltage is within a preset range.

其中，功率放大器02可以为AB类功率放大器或A类功率放大器。功率放大器02的输入端用于连接音频信号输入装置，并用于根据工作电压对音频信号进行功率放大。The power amplifier 02 may be a class AB power amplifier or a class A power amplifier. The input end of the power amplifier 02 is used to connect the audio signal input device, and is used to power amplify the audio signal according to the working voltage.

可选的，本申请实施例中的电源模块01可以为开关电源电路、降压式变换电路或升压斩波电路。Optionally, the power module 01 in the embodiment of the present application may be a switching power supply circuit, a step-down conversion circuit, or a boost chopper circuit.

可选的，本申请实施例中的预设范围可以为0.1V～0.2V。Optionally, the preset range in this embodiment of the present application may be 0.1V to 0.2V.

示例性的，以功率放大器为AB类功率放大器为例，以正弦波为例。现有技术中，如图2所示，电源模块的输出端向AB类功率放大器输入的工作电压为±V1，AB类功率放大器在对音频信号放大时使用的工作电压(即输出电压)为±V2，图2中的a1部分为无用的热功率，a2部分为有效功率，则在对音频信号放大时的功放效率为

Illustratively, take the power amplifier as a class AB power amplifier as an example, and take a sine wave as an example. In the prior art, as shown in Figure 2, the working voltage input by the output end of the power module to the class AB power amplifier is ±V1, and the working voltage (ie the output voltage) used by the class AB power amplifier when amplifying the audio signal is ±V1. V2, the a1 part in Figure 2 is the useless thermal power, the a2 part is the effective power, then the power amplifier efficiency when amplifying the audio signal is

本申请实施例中，如图3所示，电源模块01的输出端向AB类功率放大器输入的工作电压为±V3，AB类功率放大器的输出电压为±V2，且V3与V2之差为0.1V，图3中的a3部分(a3<a1)为无用的热功率，a2部分为有效功率，则在对音频信号放大时的功放效率为

由于a3<a1，因此可以看出

即在对音频信号放大时，本申请实施例中的功放效率大于现有技术中的功放效率。In the embodiment of the present application, as shown in FIG. 3 , the working voltage input by the output end of the power module 01 to the class AB power amplifier is ±V3, the output voltage of the class AB power amplifier is ±V2, and the difference between V3 and V2 is 0.1 V, the a3 part (a3<a1) in Figure 3 is the useless thermal power, and the a2 part is the effective power, then the power amplifier efficiency when amplifying the audio signal is

Since a3<a1, it can be seen that

That is, when amplifying an audio signal, the power amplifier efficiency in the embodiment of the present application is greater than that in the prior art.

示例性的，本申请实施例中的预设范围为0.1V时，在对音频信号放大时的功放效率最大，且不会产生失真现象。Exemplarily, when the preset range in the embodiment of the present application is 0.1V, the power amplifier efficiency when amplifying the audio signal is the highest, and no distortion phenomenon occurs.

例如，AB类功率放大器的输出电压V2＝4V，输入的工作电压为V3＝4.1V，则功放效率为

电源模块01为开关电源，电源效率大约为90％，则在对音频信号放大时的总效率为97.6％×90％≈87.8％。可以看出，采用AB类功率放大器对音频信号放大时，本申请实施例中的总效率大于现有技术中的总效率(大约为50％)，并且和采用D类功率放大器时的总效率(大约为90％)几乎相同。For example, the output voltage of the class AB power amplifier is V2=4V, and the input working voltage is V3=4.1V, then the power amplifier efficiency is

The power supply module 01 is a switching power supply, and the power supply efficiency is about 90%, so the total efficiency when amplifying the audio signal is 97.6%×90%≈87.8%. It can be seen that when a class AB power amplifier is used to amplify the audio signal, the total efficiency in the embodiment of the present application is greater than that in the prior art (about 50%), and is the same as the total efficiency when a class D power amplifier is used ( about 90%) almost the same.

本申请实施例提供一种音频信号的功率放大电路，由于音频信号的功率放大电路采用的是AB类功率放大器或A类功率放大器，因此具有较好的抗干扰能力；并且，由于电源模块可以通过控制向功率放大器输入的工作电压，使得该工作电压与功率放大器的输出电压之差的绝对值在预设范围内，此时电源模块产生的无用的热功率非常小，因此减少了功率的损耗，从而提高了音频信号放大过程中的放大效率。An embodiment of the present application provides a power amplifier circuit for audio signals. Since the power amplifier circuit for audio signals adopts a class AB power amplifier or a class A power amplifier, it has better anti-interference ability; The working voltage input to the power amplifier is controlled so that the absolute value of the difference between the working voltage and the output voltage of the power amplifier is within a preset range. At this time, the useless thermal power generated by the power module is very small, thus reducing the power loss, Thus, the amplification efficiency in the audio signal amplification process is improved.

可选的，在本申请实施例的一种实现方式中，结合图1，如图4所示，示出了本申请实施例提供的另一种音频信号的功率放大电路。具体的，图4中的电源模块01可以包括第一电源支路10和第二电源支路20，功率放大器02为AB类功率放大器。Optionally, in an implementation manner of the embodiment of the present application, with reference to FIG. 1 , as shown in FIG. 4 , another audio signal power amplifying circuit provided by the embodiment of the present application is shown. Specifically, the power supply module 01 in FIG. 4 may include a firstpower supply branch 10 and a secondpower supply branch 20 , and the power amplifier 02 is a class AB power amplifier.

其中，第一电源支路10的输入端用于连接音频信号输入装置，第一电源支路10的输出端与AB类功率放大器的第一电源端连接。第一电源支路10的输入端用于向AB类功率放大器输入第一工作电压，并根据AB类功率放大器的第一输出电压控制第一工作电压大于第一输出电压，且第一工作电压与第一输出电压之差的绝对值在预设范围内。The input end of the firstpower supply branch 10 is used to connect an audio signal input device, and the output end of the firstpower supply branch 10 is connected to the first power supply end of the class AB power amplifier. The input end of the firstpower supply branch 10 is used to input the first working voltage to the class AB power amplifier, and control the first working voltage to be greater than the first output voltage according to the first output voltage of the class AB power amplifier, and the first working voltage is the same as the first output voltage. The absolute value of the difference between the first output voltages is within a preset range.

其中，第二电源支路20的输入端用于连接音频信号输入装置，第二电源支路20的输出端与AB类功率放大器的第二电源端连接。第二电源支路20的输入端用于向AB类功率放大器输入第二工作电压，并根据AB类功率放大器的第二输出电压控制第二工作电压的绝对值大于第二输出电压的绝对值，且第二工作电压与第二输出电压之差的绝对值在预设范围内。The input end of the secondpower supply branch 20 is used for connecting an audio signal input device, and the output end of the secondpower supply branch 20 is connected to the second power supply end of the class AB power amplifier. The input end of the secondpower supply branch 20 is used to input the second working voltage to the class AB power amplifier, and control the absolute value of the second working voltage to be greater than the absolute value of the second output voltage according to the second output voltage of the class AB power amplifier, And the absolute value of the difference between the second working voltage and the second output voltage is within a preset range.

其中，AB类功率放大器的输入端用于连接音频信号输入装置。Among them, the input end of the class AB power amplifier is used to connect the audio signal input device.

示例性的，本申请实施例中的第一电源支路10可以为正电源模块，AB类功率放大器的第一电源端可以为正电源端。第一电源支路10向AB类功率放大器输入第一工作电压+V3(即V3，V3>0)，并根据AB类功率放大器的第一输出电压+V2(即V2，V2≥0)控制V3大于V2，且V3与V2之差的绝对值在预设范围内。Exemplarily, the firstpower supply branch 10 in the embodiment of the present application may be a positive power supply module, and the first power supply terminal of the class AB power amplifier may be a positive power supply terminal. The firstpower supply branch 10 inputs the first working voltage +V3 (ie V3, V3>0) to the class AB power amplifier, and controls V3 according to the first output voltage +V2 (ie V2, V2≥0) of the class AB power amplifier is greater than V2, and the absolute value of the difference between V3 and V2 is within a preset range.

例如，假设预设范围为0.1V。AB类功率放大器的第一输出电压为4V，第一电源支路10则向AB类功率放大器输入的第一工作电压为4.1V。For example, assume the preset range is 0.1V. The first output voltage of the class AB power amplifier is 4V, and the first operating voltage input by the firstpower supply branch 10 to the class AB power amplifier is 4.1V.

示例性的，本申请实施例中的第二电源支路20可以为负电源模块，AB类功率放大器的第二电源端可以为负电源端。第二电源支路20向AB类功率放大器输入第二工作电压-V3，并根据AB类功率放大器的第二输出电压-V2控制-V3的绝对值大于-V2的绝对值(即V3大于V2)，且-V3与-V2之差的绝对值在预设范围内。Exemplarily, the secondpower supply branch 20 in the embodiment of the present application may be a negative power supply module, and the second power supply terminal of the class AB power amplifier may be a negative power supply terminal. The secondpower supply branch 20 inputs the second operating voltage -V3 to the class AB power amplifier, and controls the absolute value of -V3 to be greater than the absolute value of -V2 according to the second output voltage -V2 of the class AB power amplifier (ie, V3 is greater than V2) , and the absolute value of the difference between -V3 and -V2 is within the preset range.

例如，假设预设范围为0.1V。AB类功率放大器的第二输出电压为-4V，第一电源支路10则向AB类功率放大器输入的第二工作电压为-4.1V。For example, assume the preset range is 0.1V. The second output voltage of the class AB power amplifier is -4V, and the second operating voltage input by the firstpower supply branch 10 to the class AB power amplifier is -4.1V.

进一步的，本申请实施例中的电源模块01可以为开关电源电路。如图5所示，示出了本申请实施例提供的一种第一电源支路10。其中，第一电源支路10包括正向二极管100、第一比较器101、第一晶体管102和第一还原电路103。Further, the power supply module 01 in the embodiment of the present application may be a switching power supply circuit. As shown in FIG. 5 , a firstpower supply branch 10 provided by an embodiment of the present application is shown. The firstpower supply branch 10 includes a forward diode 100 , a first comparator 101 , afirst transistor 102 and a first restoration circuit 103 .

其中，正向二极管100的第一端用于连接音频信号输入装置，正向二极管100的第二端与第一比较器101的第一端连接，第一比较器101的第二端与第一晶体管102的栅极连接，第一晶体管102的源极与正电源电压(Volt Current Condenser，VCC)连接，第一晶体管102的漏极与第一还原电路103的第一端连接，第一还原电路103的第二端与AB类功率放大器的第一电源端连接。The first end of the forward diode 100 is used to connect the audio signal input device, the second end of the forward diode 100 is connected to the first end of the first comparator 101, and the second end of the first comparator 101 is connected to the first end of the first comparator 101. The gate of thetransistor 102 is connected, the source of thefirst transistor 102 is connected to the positive power supply voltage (Volt Current Condenser, VCC), the drain of thefirst transistor 102 is connected to the first end of the first restoration circuit 103, and the first restoration circuit The second terminal of 103 is connected to the first power terminal of the class AB power amplifier.

其中，正向二极管100，用于对音频信号进行分离处理，以得到第一音频信号。The forward diode 100 is used to separate and process the audio signal to obtain the first audio signal.

示例性的，以正弦波信号为例。如图6所示，正向二极管100对图6中的(1)所示的正弦波信号进行分离处理，得到图6中的(2)所示的第一正弦波信号。Illustratively, take a sine wave signal as an example. As shown in FIG. 6 , the forward diode 100 performs separation processing on the sine wave signal shown in (1) in FIG. 6 to obtain the first sine wave signal shown in (2) in FIG. 6 .

其中，第一比较器101，用于对第一音频信号进行比较处理，以得到第一脉宽调制(Pulse Width Modulation，PWM)信号。The first comparator 101 is configured to perform comparison processing on the first audio signal to obtain a first pulse width modulation (Pulse Width Modulation, PWM) signal.

示例性的，如图5所示，第一比较器101的第三端与第一锯齿波发生器连接，第一比较器101用于对第一音频信号和第一锯齿波发生器产生的第一锯齿波信号进行比较处理。Exemplarily, as shown in FIG. 5 , the third end of the first comparator 101 is connected to the first sawtooth wave generator, and the first comparator 101 is used to compare the first audio signal and the first signal generated by the first sawtooth wave generator. A sawtooth wave signal is compared and processed.

示例性的，如图7所示，第一比较器101将图6中的(2)所示的第一正弦波信号与第一锯齿波信号进行比较，当第一正弦波信号高于第一锯齿波信号时，记为高电平，当第一正弦波信号低于第一锯齿波信号时，记为低电平，得到如图7所示的第一PWM信号。Exemplarily, as shown in FIG. 7 , the first comparator 101 compares the first sine wave signal shown in (2) in FIG. 6 with the first sawtooth wave signal, and when the first sine wave signal is higher than the first When a sawtooth wave signal is used, it is recorded as a high level, and when the first sine wave signal is lower than the first sawtooth wave signal, it is recorded as a low level, and a first PWM signal as shown in FIG. 7 is obtained.

其中，第一晶体管102，用于对第一PWM信号进行放大处理，以得到放大的第一PWM信号；第一晶体管102，还用于根据第一输出电压控制放大的第一PWM信号的电压为第一工作电压。Thefirst transistor 102 is used for amplifying the first PWM signal to obtain the amplified first PWM signal; thefirst transistor 102 is also used for controlling the voltage of the amplified first PWM signal according to the first output voltage to be The first working voltage.

示例性的，第一晶体管102可以为金属-氧化物-半导体(Metal-Oxide-Semiconductor，MOS)管。第一晶体管102根据第一输出电压V2控制放大的第一PWM信号的电压为第一工作电压V3，V3大于V2，且V3与V2之差的绝对值在预设范围内。Exemplarily, thefirst transistor 102 may be a metal-oxide-semiconductor (Metal-Oxide-Semiconductor, MOS) transistor. Thefirst transistor 102 controls the voltage of the amplified first PWM signal according to the first output voltage V2 to be the first operating voltage V3, where V3 is greater than V2, and the absolute value of the difference between V3 and V2 is within a preset range.

本申请实施例中，第一晶体管102控制放大的第一PWM信号的电压为第一工作电压，第一工作电压大于第一输出电压，且第一工作电压与第一输出电压之差的绝对值在预设范围内，此时第一晶体管102工作在饱和区(第一晶体管102的源极和漏极之间的压降大约为0.1V)，产生的无用的热功率非常小。In the embodiment of the present application, the voltage of the first PWM signal amplified by thefirst transistor 102 is the first working voltage, the first working voltage is greater than the first output voltage, and the absolute value of the difference between the first working voltage and the first output voltage Within the preset range, thefirst transistor 102 operates in the saturation region (the voltage drop between the source and the drain of thefirst transistor 102 is about 0.1V), and the useless heat power generated is very small.

其中，第一还原电路103，用于对放大的第一PWM信号进行还原处理，以得到放大的第一音频信号；第一还原电路103，还用于向AB类功率放大器输入第一工作电压的放大的第一音频信号。Wherein, the first restoration circuit 103 is used to restore the amplified first PWM signal to obtain the amplified first audio signal; the first restoration circuit 103 is also used to input the first working voltage to the class AB power amplifier. The amplified first audio signal.

示例性的，第一还原电路103可以对放大的第一PWM信号进行滤波等还原处理，得到放大的第一音频信号。第一还原电路103可以包括正向二极管、电感和电容等元件。Exemplarily, the first restoration circuit 103 may perform restoration processing such as filtering on the amplified first PWM signal to obtain the amplified first audio signal. The first restoration circuit 103 may include elements such as forward diodes, inductors, and capacitors.

如图8所示，示出了本申请实施例提供的一种第二电源支路20。其中，第二电源支路20包括反向二极管200、第二比较器201、第二晶体管202和第二还原电路203。As shown in FIG. 8 , a secondpower supply branch 20 provided by an embodiment of the present application is shown. The secondpower supply branch 20 includes a reverse diode 200 , a second comparator 201 , asecond transistor 202 and a second restoration circuit 203 .

其中，反向二极管200的第一端用于连接音频信号输入装置，反向二极管200的第二端与第二比较器201的第一端连接，第二比较器201的第二端与第二晶体管202的栅极连接，第二晶体管202的源极与负VCC连接，第二晶体管202的漏极与第二还原电路203的第一端连接，第二还原电路203的第二端与AB类功率放大器的第二电源端连接。The first end of the reverse diode 200 is used to connect the audio signal input device, the second end of the reverse diode 200 is connected to the first end of the second comparator 201, and the second end of the second comparator 201 is connected to the second The gate of thetransistor 202 is connected, the source of thesecond transistor 202 is connected to the negative VCC, the drain of thesecond transistor 202 is connected to the first end of the second restoration circuit 203, and the second end of the second restoration circuit 203 is connected to the class AB The second power supply terminal of the power amplifier is connected.

其中，反向二极管200，用于对音频信号进行分离处理，以得到第二音频信号。The reverse diode 200 is used to separate and process the audio signal to obtain the second audio signal.

示例性的，以正弦波信号为例。如图9所示，反向二极管200对图6中的(1)所示的正弦波信号进行分离处理，得到如图9所示的第二正弦波信号。Illustratively, take a sine wave signal as an example. As shown in FIG. 9 , the reverse diode 200 performs separation processing on the sine wave signal shown in (1) in FIG. 6 to obtain the second sine wave signal shown in FIG. 9 .

其中，第二比较器201，用于对第二音频信号进行比较处理，以得到第二PWM信号。The second comparator 201 is used for comparing and processing the second audio signal to obtain the second PWM signal.

示例性的，如图8所示，第二比较器201的第三端与第二锯齿波发生器连接，第二比较器201用于对第二音频信号和第二锯齿波发生器产生的第二锯齿波信号进行比较处理。Exemplarily, as shown in FIG. 8 , the third end of the second comparator 201 is connected to the second sawtooth wave generator, and the second comparator 201 is used to compare the second audio signal and the first signal generated by the second sawtooth wave generator. The two sawtooth wave signals are compared and processed.

示例性的，如图10所示，第二比较器201将图9所示的第二正弦波信号与第二锯齿波信号进行比较，当第二正弦波信号高于第二锯齿波信号时，记为高电平，当第二正弦波信号低于第二锯齿波信号时，记为低电平，得到如图10所示的第二PWM信号。Exemplarily, as shown in FIG. 10 , the second comparator 201 compares the second sine wave signal shown in FIG. 9 with the second sawtooth wave signal, and when the second sine wave signal is higher than the second sawtooth wave signal, It is marked as a high level, and when the second sine wave signal is lower than the second sawtooth wave signal, it is marked as a low level, and a second PWM signal as shown in FIG. 10 is obtained.

其中，第二晶体管202，用于对第二PWM信号进行放大处理，以得到放大的第二PWM信号；第二晶体管202，还用于根据第二输出电压控制放大的第二PWM信号的电压为第二工作电压。Thesecond transistor 202 is used to amplify the second PWM signal to obtain the amplified second PWM signal; thesecond transistor 202 is also used to control the voltage of the amplified second PWM signal according to the second output voltage to be second working voltage.

示例性的，第二晶体管202可以为MOS管。第二晶体管202根据第二输出电压-V2控制放大的第二PWM信号的电压为第二工作电压-V3，-V3的绝对值大于-V2的绝对值，且-V3与-V2之差的绝对值在预设范围内。Exemplarily, thesecond transistor 202 may be a MOS transistor. Thesecond transistor 202 controls the voltage of the second PWM signal amplified according to the second output voltage -V2 to be the second operating voltage -V3, the absolute value of -V3 is greater than the absolute value of -V2, and the absolute value of the difference between -V3 and -V2 The value is within the preset range.

本申请实施例中，第二晶体管202控制放大的第二PWM信号的电压为第二工作电压，第二工作电压的绝对值大于第二输出电压的绝对值，且第二工作电压与第二输出电压之差的绝对值在预设范围内，此时第二晶体管202工作在饱和区(第二晶体管202的源极和漏极之间的压降大约为0.1V)，产生的无用的热功率非常小。In the embodiment of the present application, the voltage of the second PWM signal amplified by thesecond transistor 202 is the second working voltage, the absolute value of the second working voltage is greater than the absolute value of the second output voltage, and the second working voltage is the same as the second output voltage. The absolute value of the difference between the voltages is within the preset range, and thesecond transistor 202 operates in the saturation region (the voltage drop between the source and the drain of thesecond transistor 202 is about 0.1V), resulting in useless thermal power very small.

其中，第二还原电路203，用于对放大的第二PWM信号进行还原处理，以得到放大的第二音频信号；第二还原电路203，还用于向AB类功率放大器输入第二工作电压的放大的第二音频信号。Wherein, the second restoration circuit 203 is used to restore the amplified second PWM signal to obtain the amplified second audio signal; the second restoration circuit 203 is also used to input the second working voltage to the class AB power amplifier. Amplified second audio signal.

示例性的，第二还原电路203可以对放大的第二PWM信号进行滤波等还原处理，得到放大的第二音频信号。第二还原电路203可以包括反向二极管、电感和电容等元件。Exemplarily, the second restoration circuit 203 may perform restoration processing such as filtering on the amplified second PWM signal to obtain the amplified second audio signal. The second restoration circuit 203 may include elements such as reverse diodes, inductors, and capacitors.

本申请实施例中，结合图5和图8，如图11所示，示出了本申请实施例提供的一种电源模块01。其中，电源模块01包括第一电源支路10和第二电源支路20。第一电源支路10包括正向二极管100、第一比较器101、第一晶体管102和第一还原电路103。第二电源支路20包括反向二极管200、第二比较器201、第二晶体管202和第二还原电路203。In the embodiment of the present application, with reference to FIG. 5 and FIG. 8 , as shown in FIG. 11 , a power module 01 provided by the embodiment of the present application is shown. The power supply module 01 includes a firstpower supply branch 10 and a secondpower supply branch 20 . The firstpower supply branch 10 includes a forward diode 100 , a first comparator 101 , afirst transistor 102 and a first restoration circuit 103 . The secondpower supply branch 20 includes a reverse diode 200 , a second comparator 201 , asecond transistor 202 and a second restoration circuit 203 .

其中，正向二极管100的第一端用于连接音频信号输入装置，正向二极管100的第二端与第一比较器101的第一端连接，第一比较器101的第二端与第一晶体管102的栅极连接，第一比较器101的第三端与第一锯齿波发生器连接，第一晶体管102的源极与正VCC连接，第一晶体管102的漏极与第一还原电路103的第一端连接，第一还原电路103的第二端用于连接AB类功率放大器的第一电源端。The first end of the forward diode 100 is used to connect the audio signal input device, the second end of the forward diode 100 is connected to the first end of the first comparator 101, and the second end of the first comparator 101 is connected to the first end of the first comparator 101. The gate of thetransistor 102 is connected, the third end of the first comparator 101 is connected to the first sawtooth wave generator, the source of thefirst transistor 102 is connected to the positive VCC, and the drain of thefirst transistor 102 is connected to the first restoration circuit 103 The first end of the first restoration circuit 103 is connected to the first power supply end of the class AB power amplifier.

其中，反向二极管200的第一端用于连接音频信号输入装置，反向二极管200的第二端与第二比较器201的第一端连接，第二比较器201的第二端与第二晶体管202的栅极连接，第二比较器201的第三端与第二锯齿波发生器连接，第二晶体管202的源极与负VCC连接，第二晶体管202的漏极与第二还原电路203的第一端连接，第二还原电路203的第二端用于连接AB类功率放大器的第二电源端。The first end of the reverse diode 200 is used to connect the audio signal input device, the second end of the reverse diode 200 is connected to the first end of the second comparator 201, and the second end of the second comparator 201 is connected to the second The gate of thetransistor 202 is connected to the gate, the third end of the second comparator 201 is connected to the second sawtooth generator, the source of thesecond transistor 202 is connected to the negative VCC, and the drain of thesecond transistor 202 is connected to the second reduction circuit 203 The first end of the second restoration circuit 203 is connected to the second power supply end of the class AB power amplifier.

本申请实施例中，结合图4和图11，如图12所示，示出了本申请实施例提供的另一种音频信号的功率放大电路。其中，音频信号的功率放大电路1包括电源模块01和AB功率放大器。电源模块01包括第一电源支路10和第二电源支路20。第一电源支路10包括正向二极管100、第一比较器101、第一晶体管102和第一还原电路103。第二电源支路20包括反向二极管200、第二比较器201、第二晶体管202和第二还原电路203。In the embodiment of the present application, with reference to FIG. 4 and FIG. 11 , as shown in FIG. 12 , another audio signal power amplifying circuit provided by the embodiment of the present application is shown. Thepower amplifying circuit 1 of the audio signal includes a power supply module 01 and an AB power amplifier. The power supply module 01 includes a firstpower supply branch 10 and a secondpower supply branch 20 . The firstpower supply branch 10 includes a forward diode 100 , a first comparator 101 , afirst transistor 102 and a first restoration circuit 103 . The secondpower supply branch 20 includes a reverse diode 200 , a second comparator 201 , asecond transistor 202 and a second restoration circuit 203 .

需要说明的是，本申请实施例中的电源模块还可以为其他的开关电源模块，本申请实施例在此不作任何限制。It should be noted that, the power supply module in the embodiment of the present application may also be other switching power supply modules, and the embodiment of the present application does not make any limitation here.

需要说明的是，本申请实施例中的符号“±”表示正或负，例如输出电压为±V2表示输出电压为+V2(即V2)或为-V2。It should be noted that the symbol "±" in the embodiments of the present application means positive or negative, for example, an output voltage of ±V2 means that the output voltage is +V2 (ie V2) or -V2.

可选的，在本申请实施例的另一种实现方式中，电源模块01可以仅包括第三电源支路30，功率放大器为A类功率放大器。Optionally, in another implementation manner of the embodiment of the present application, the power supply module 01 may only include the third power supply branch 30 , and the power amplifier is a class A power amplifier.

其中，第三电源支路30的输入端用于连接音频信号输入装置，第三电源支路30的输出端与A类功率放大器的电源端连接。第三电源支路30的输入端用于向A类功率放大器输入第三工作电压，并根据A类功率放大器的第三输出电压控制第三工作电压的绝对值大于第三输出电压的绝对值，且第三工作电压与第三输出电压之差的绝对值在预设范围内。A类功率放大器的输入端用于连接音频信号输入装置。The input end of the third power supply branch 30 is used for connecting an audio signal input device, and the output end of the third power supply branch 30 is connected to the power supply end of the class A power amplifier. The input end of the third power supply branch 30 is used to input the third working voltage to the class A power amplifier, and control the absolute value of the third working voltage to be greater than the absolute value of the third output voltage according to the third output voltage of the class A power amplifier, And the absolute value of the difference between the third working voltage and the third output voltage is within a preset range. The input terminal of the class A power amplifier is used to connect the audio signal input device.

在本申请的第二种实施例中，图13示出了本申请实施例提供的一种终端设备。如图13所示，该终端设备1300可以包括：至少一个音频信号输出装置1301和音频信号的功率放大电路1。In the second embodiment of the present application, FIG. 13 shows a terminal device provided by an embodiment of the present application. As shown in FIG. 13 , the terminal device 1300 may include: at least one audio signal output device 1301 and apower amplifying circuit 1 for audio signals.

其中，音频信号的功率放大电路1用于驱动至少一个音频信号输出装置1301，以使得至少一个音频信号输出装置1301输出放大后的音频信号。Thepower amplifying circuit 1 of the audio signal is used to drive at least one audio signal output device 1301, so that the at least one audio signal output device 1301 outputs the amplified audio signal.

示例性的，至少一个音频信号输出装置1301可以为至少一个扬声器。Exemplarily, the at least one audio signal output device 1301 may be at least one speaker.

相较于现有技术，本申请实施例提供的终端设备中，音频信号的功率放大电路1的布局比较灵活，无需局限于扬声器附近，尤其是在终端设备包含多个(大于一个)扬声器的情况下，效果更佳突出。下面结合附图具体说明。图14和图15分别示出了现有技术中终端设备1300和本申请实施例中的终端设备1300。Compared with the prior art, in the terminal device provided by the embodiment of the present application, the layout of thepower amplifying circuit 1 of the audio signal is relatively flexible, and does not need to be limited to the vicinity of the speaker, especially when the terminal device includes multiple (greater than one) speakers. down, the effect is better. The following is a detailed description with reference to the accompanying drawings. FIG. 14 and FIG. 15 respectively show the terminal device 1300 in the prior art and the terminal device 1300 in the embodiment of the present application.

示例性的，如图14所示，现有技术中的终端设备1300在包括多个(图14中仅示出两个为例)扬声器(即扬声器1和扬声器2)时，需要相应数量的音频信号的功率放大电路(图14中的音频信号的功率放大电路2和音频信号的功率放大电路3)。其中，音频信号的功率放大电路2包括D类功率放大器1，音频信号的功率放大电路3包括D类功率放大器2，D类功率放大器1与扬声器1连接，D类功率放大器2与扬声器2连接。Exemplarily, as shown in FIG. 14 , when the terminal device 1300 in the prior art includes multiple (only two are shown in FIG. 14 as an example) speakers (ie,speaker 1 and speaker 2 ), a corresponding amount of audio frequency is required. Signal power amplifying circuit (audio signalpower amplifying circuit 2 and audio signal power amplifying circuit 3 in FIG. 14 ). The audio signalpower amplifier circuit 2 includes a classD power amplifier 1 , the audio signal power amplifier circuit 3 includes a classD power amplifier 2 , the classD power amplifier 1 is connected to thespeaker 1 , and the classD power amplifier 2 is connected to thespeaker 2 .

示例性的，如图15所示，本申请实施例的终端设备1300在多个(图15中仅示出两个为例)扬声器(即扬声器1和扬声器2)时，可以采用一个音频信号的功率放大电路(图15中的音频信号的功率放大电路1)。其中，音频信号的功率放大电路1包括AB类功率放大器(或A类功率放大器)，AB类功率放大器分别与扬声器1和扬声器2连接。Exemplarily, as shown in FIG. 15 , when the terminal device 1300 in this embodiment of the present application has multiple (only two are shown in FIG. 15 as an example) speakers (that is,speaker 1 and speaker 2 ), one audio signal may be used. Power amplifier circuit (power amplifier circuit 1 for audio signal in Figure 15). Thepower amplifier circuit 1 of the audio signal includes a class AB power amplifier (or class A power amplifier), and the class AB power amplifier is connected to thespeaker 1 and thespeaker 2 respectively.

由于现有技术中，当终端设备1300包含有多个(大于一个)扬声器时，由于采用D类功率放大器时的干扰较大，D类功率放大器通常只能靠近扬声器的位置，且需要多个D类功率放大器驱动扬声器，因此终端设备1300中的D类功率放大器的布局比较复杂，且成本较高。Because in the prior art, when the terminal device 1300 includes multiple (more than one) speakers, due to the large interference when using a Class D power amplifier, the Class D power amplifier can usually only be located close to the speaker, and multiple D power amplifiers are required. The class-D power amplifier drives the speaker, so the layout of the class-D power amplifier in the terminal device 1300 is complicated and the cost is high.

而本申请实施例中，当终端设备1300包含有多个扬声器时，由于音频信号的功率放大电路1中的AB类功率放大器抗干扰能力较强，AB类功率放大器可以与位置较远的扬声器相连以驱动该扬声器，因此一个AB类功率放大器可以驱动多个扬声器，简化了功率放大器的布局，且节省了成本；并且，音频信号的功率放大电路1中的电源模块01通过控制向AB类功率放大器输入的工作电压，使得该工作电压与AB类功率放大器的输出电压之差的绝对值在预设范围内，此时电源模块01产生的无用的热功率非常小，因此减少了功率的损耗，从而提高了音频信号放大过程中的放大效率。However, in the embodiment of the present application, when the terminal device 1300 includes multiple speakers, since the class AB power amplifier in the audio signalpower amplifier circuit 1 has strong anti-interference ability, the class AB power amplifier can be connected to the farther speaker. to drive the speaker, so one class AB power amplifier can drive multiple speakers, which simplifies the layout of the power amplifier and saves the cost; and, the power module 01 in thepower amplifier circuit 1 of the audio signal controls the power amplifier to the class AB power amplifier. The input working voltage makes the absolute value of the difference between the working voltage and the output voltage of the class AB power amplifier within the preset range. At this time, the useless thermal power generated by the power module 01 is very small, so the power loss is reduced. The amplification efficiency in the audio signal amplification process is improved.

在本申请的第三种实施例中，图16示出了本申请实施例提供的一种音频信号的功率放大方法，该方法可以应用于如图1、图4和图12中任一所述的音频信号的功率放大电路。如图16所示，该音频信号的功率放大方法包括S1601和S1602：In the third embodiment of the present application, FIG. 16 shows a power amplifying method for an audio signal provided by an embodiment of the present application, and the method can be applied to any one of those described in FIG. 1 , FIG. 4 , and FIG. 12 . audio signal power amplifier circuit. As shown in Figure 16, the power amplification method of the audio signal includes S1601 and S1602:

S1601、电源模块向功率放大器输入工作电压。S1601. The power supply module inputs a working voltage to the power amplifier.

其中，功率放大器可以为AB类功率放大器或A类功率放大器。Wherein, the power amplifier may be a class AB power amplifier or a class A power amplifier.

S1602、电源模块根据功率放大器的输出电压，控制工作电压的绝对值大于输出电压的绝对值，且工作电压与输出电压之差的绝对值在预设范围内。S1602. The power module controls the absolute value of the working voltage to be greater than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range.

其中，功率放大器可以根据工作电压对音频信号进行功率放大。The power amplifier can perform power amplification on the audio signal according to the working voltage.

本申请实施例提供一种音频信号的功率放大方法，由于音频信号的功率放大电路采用的是AB类功率放大器或A类功率放大器，因此具有较好的抗干扰能力；并且，由于电源模块可以通过控制向功率放大器输入的工作电压，使得该工作电压与功率放大器的输出电压之差的绝对值在预设范围内，此时电源模块产生的无用的热功率非常小，因此减少了功率的损耗，从而提高了音频信号放大过程中的放大效率。The embodiment of the present application provides a power amplifying method for an audio signal. Since the power amplifying circuit of the audio signal adopts a class AB power amplifier or a class A power amplifier, it has better anti-interference ability; The working voltage input to the power amplifier is controlled so that the absolute value of the difference between the working voltage and the output voltage of the power amplifier is within a preset range. At this time, the useless thermal power generated by the power module is very small, thus reducing the power loss, Thus, the amplification efficiency in the audio signal amplification process is improved.

可选的，本申请实施例中，结合图16，如图17所示，上述S1601具体可以通过S1601a和S1601b实现：Optionally, in this embodiment of the present application, with reference to FIG. 16 , as shown in FIG. 17 , the foregoing S1601 may be specifically implemented through S1601a and S1601b:

S1601a、电源模块通过第一电源支路向AB类功率放大器输入第一工作电压。S1601a, the power supply module inputs the first working voltage to the class AB power amplifier through the first power supply branch.

S1601b、电源模块通过第二电源支路向AB类功率放大器输入第二工作电压。S1601b, the power supply module inputs the second working voltage to the class AB power amplifier through the second power supply branch.

相应的，本申请实施例中，结合图16，如图17所示，上述S1602具体可以通过S1602a和S1602b实现：Correspondingly, in this embodiment of the present application, with reference to FIG. 16 , as shown in FIG. 17 , the above S1602 can be specifically implemented by S1602a and S1602b:

S1602a、电源模块通过第一电源支路，根据AB类功率放大器的第一输出电压控制第一工作电压大于第一输出电压，且第一工作电压与第一输出电压之差的绝对值在预设范围内。S1602a, the power supply module controls the first operating voltage to be greater than the first output voltage according to the first output voltage of the class AB power amplifier through the first power supply branch, and the absolute value of the difference between the first operating voltage and the first output voltage is at a preset value within the range.

S1602b、电源模块通过第二电源支路，根据AB类功率放大器的第二输出电压控制第二工作电压的绝对值大于第二输出电压的绝对值，且第二工作电压与第二输出电压之差的绝对值在预设范围内。S1602b, the power supply module controls the absolute value of the second working voltage to be greater than the absolute value of the second output voltage according to the second output voltage of the class AB power amplifier through the second power supply branch, and the difference between the second working voltage and the second output voltage The absolute value of is within the preset range.

可选的，本申请实施例中，结合图16，如图18所示，上述S1601具体可以通过S1601c实现：Optionally, in this embodiment of the present application, with reference to FIG. 16 , as shown in FIG. 18 , the foregoing S1601 may be specifically implemented through S1601c:

S1601c、电源模块通过第三电源支路向A类功率放大器输入第三工作电压。S1601c, the power supply module inputs a third working voltage to the class A power amplifier through the third power supply branch.

相应的，本申请实施例中，结合图16，如图18所示，上述S1602具体可以通过S1602c实现：Correspondingly, in this embodiment of the present application, with reference to FIG. 16 , as shown in FIG. 18 , the above S1602 can be specifically implemented by S1602c:

S1602c、电源模块通过第三电源支路，根据A类功率放大器的第三输出电压控制第三工作电压的绝对值大于第三输出电压的绝对值，且第三工作电压与第三输出电压之差的绝对值在预设范围内。S1602c, the power supply module controls the absolute value of the third working voltage to be greater than the absolute value of the third output voltage according to the third output voltage of the class A power amplifier through the third power supply branch, and the difference between the third working voltage and the third output voltage The absolute value of is within the preset range.

需要说明的是，本申请实施例提供的音频信号的功率放大方法中的相关方法步骤的具体描述，可以参考本申请实施例中的音频信号的功率放大电路的相关描述，此处不再赘述。It should be noted that, for the specific description of the related method steps in the audio signal power amplifying method provided by the embodiment of the present application, reference may be made to the related description of the audio signal power amplifying circuit in the embodiment of the present application, which will not be repeated here.

需要说明的是，在本申请实施例中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。It should be noted that, in the embodiments of the present application, the terms "comprising", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes Those elements, but also other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of this application.

上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the scope of protection of the purpose of this application and the claims, many forms can be made, which all fall within the protection of this application.

Claims (9)

Translated fromChinese

1.一种音频信号的功率放大电路，其特征在于，包括：1. a power amplifier circuit of audio signal, is characterized in that, comprises:电源模块和功率放大器，所述功率放大器为AB类功率放大器或A类功率放大器，所述电源模块包括一个电源支路或两个电源支路；A power supply module and a power amplifier, the power amplifier is a class AB power amplifier or a class A power amplifier, and the power supply module includes one power supply branch or two power supply branches;所述电源模块的每个电源支路的输入端用于连接音频信号输入装置；对于所述电源模块的每个电源支路，所述每个电源支路的输出端与所述功率放大器的一个电源端连接，用于向所述功率放大器输入一个工作电压，并根据所述功率放大器的输出电压控制所述一个工作电压的绝对值大于所述输出电压的绝对值，且所述一个工作电压与所述输出电压之差的绝对值在预设范围内；The input end of each power supply branch of the power supply module is used to connect an audio signal input device; for each power supply branch of the power supply module, the output end of each power supply branch is connected to one of the power amplifiers. The power supply terminal is connected to input a working voltage to the power amplifier, and according to the output voltage of the power amplifier, the absolute value of the one working voltage is controlled to be greater than the absolute value of the output voltage, and the one working voltage is the same as the output voltage. The absolute value of the difference between the output voltages is within a preset range;所述功率放大器的输入端用于连接所述音频信号输入装置，用于根据所述每个电源支路的工作电压对音频信号进行功率放大。The input end of the power amplifier is used to connect the audio signal input device, and is used for power amplifying the audio signal according to the working voltage of each power supply branch.2.根据权利要求1所述的音频信号的功率放大电路，其特征在于，所述电源模块包括两个电源支路，所述两个电源支路为第一电源支路和第二电源支路，所述功率放大器为所述AB类功率放大器；2 . The audio signal power amplifier circuit according to claim 1 , wherein the power supply module comprises two power supply branches, and the two power supply branches are a first power supply branch and a second power supply branch. 3 . , the power amplifier is the class AB power amplifier;所述第一电源支路的输入端用于连接所述音频信号输入装置，所述第一电源支路的输出端与所述AB类功率放大器的第一电源端连接，用于向所述AB类功率放大器输入第一工作电压，并根据所述AB类功率放大器的第一输出电压控制所述第一工作电压大于所述第一输出电压，且所述第一工作电压与所述第一输出电压之差的绝对值在预设范围内；The input end of the first power supply branch is used to connect to the audio signal input device, and the output end of the first power supply branch is connected to the first power supply end of the class AB power amplifier, and is used to connect to the AB power amplifier. The class power amplifier inputs a first working voltage, and controls the first working voltage to be greater than the first output voltage according to the first output voltage of the class AB power amplifier, and the first working voltage and the first output The absolute value of the voltage difference is within the preset range;所述第二电源支路的输入端用于连接所述音频信号输入装置，所述第二电源支路的输出端与所述AB类功率放大器的第二电源端连接，用于向所述AB类功率放大器输入第二工作电压，并根据所述AB类功率放大器的第二输出电压控制所述第二工作电压的绝对值大于所述第二输出电压的绝对值，且所述第二工作电压与所述第二输出电压之差的绝对值在预设范围内；The input end of the second power supply branch is used to connect to the audio signal input device, and the output end of the second power supply branch is connected to the second power supply end of the class AB power amplifier, and is used to connect to the AB power amplifier. The class power amplifier inputs a second working voltage, and controls the absolute value of the second working voltage to be greater than the absolute value of the second output voltage according to the second output voltage of the class AB power amplifier, and the second working voltage the absolute value of the difference with the second output voltage is within a preset range;所述AB类功率放大器的输入端用于连接所述音频信号输入装置。The input end of the class AB power amplifier is used to connect the audio signal input device.3.根据权利要求1所述的音频信号的功率放大电路，其特征在于，所述电源模块包括一个电源支路，所述一个电源支路为第三电源支路，所述功率放大器为所述A类功率放大器；3. The power amplifier circuit for audio signals according to claim 1, wherein the power supply module comprises a power supply branch, the one power supply branch is a third power supply branch, and the power amplifier is the Class A power amplifier;所述第三电源支路的输入端用于连接所述音频信号输入装置，所述第三电源支路的输出端与所述A类功率放大器的电源端连接，用于向所述A类功率放大器输入第三工作电压，并根据所述A类功率放大器的第三输出电压控制所述第三工作电压的绝对值大于所述第三输出电压的绝对值，且所述第三工作电压与所述第三输出电压之差的绝对值在预设范围内；The input end of the third power supply branch is used to connect to the audio signal input device, and the output end of the third power supply branch is connected to the power supply end of the class A power amplifier, and is used to supply the class A power The amplifier inputs a third working voltage, and controls the absolute value of the third working voltage to be greater than the absolute value of the third output voltage according to the third output voltage of the class A power amplifier, and the third working voltage is the same as the third output voltage. the absolute value of the difference between the third output voltages is within a preset range;所述A类功率放大器的输入端用于连接所述音频信号输入装置。The input end of the class A power amplifier is used to connect the audio signal input device.4.根据权利要求2所述的音频信号的功率放大电路，其特征在于，所述第一电源支路包括正向二极管、第一比较器、第一晶体管和第一还原电路；4. The power amplifying circuit of an audio signal according to claim 2, wherein the first power supply branch comprises a forward diode, a first comparator, a first transistor and a first restoration circuit;所述正向二极管的第一端用于连接所述音频信号输入装置，所述正向二极管的第二端与所述第一比较器的第一端连接，所述第一比较器的第二端与所述第一晶体管的栅极连接，所述第一晶体管的源极与正电源电压VCC连接，所述第一晶体管的漏极与所述第一还原电路的第一端连接，所述第一还原电路的第二端与所述AB类功率放大器的第一电源端连接；The first end of the forward diode is used to connect to the audio signal input device, the second end of the forward diode is connected to the first end of the first comparator, and the second end of the first comparator is connected to the first end of the first comparator. The terminal is connected to the gate of the first transistor, the source of the first transistor is connected to the positive power supply voltage VCC, the drain of the first transistor is connected to the first terminal of the first reduction circuit, the The second end of the first restoration circuit is connected to the first power supply end of the class AB power amplifier;所述正向二极管，用于对所述音频信号进行分离处理，以得到第一音频信号；The forward diode is used to separate and process the audio signal to obtain a first audio signal;所述第一比较器，用于对所述第一音频信号进行比较处理，以得到第一脉宽调制PWM信号；the first comparator, configured to compare and process the first audio signal to obtain a first pulse width modulated PWM signal;所述第一晶体管，用于对所述第一PWM信号进行放大处理，以得到放大的第一PWM信号，并用于根据所述第一输出电压控制所述放大的第一PWM信号的电压为第一工作电压；The first transistor is used to amplify the first PWM signal to obtain an amplified first PWM signal, and is used to control the voltage of the amplified first PWM signal to be the first PWM signal according to the first output voltage. a working voltage;所述第一还原电路，用于对所述放大的第一PWM信号进行还原处理，以得到放大的第一音频信号，并用于向所述AB类功率放大器输入所述第一工作电压的所述放大的第一音频信号。The first restoration circuit is used to restore the amplified first PWM signal to obtain the amplified first audio signal, and is used to input the first operating voltage to the class AB power amplifier. The amplified first audio signal.5.根据权利要求2所述的音频信号的功率放大电路，其特征在于，所述第二电源支路包括反向二极管、第二比较器、第二晶体管和第二还原电路；5. The power amplifier circuit of an audio signal according to claim 2, wherein the second power supply branch comprises a reverse diode, a second comparator, a second transistor and a second reduction circuit;所述反向二极管的第一端用于连接所述音频信号输入装置，所述反向二极管的第二端与所述第二比较器的第一端连接，所述第二比较器的第二端与所述第二晶体管的栅极连接，所述第二晶体管的源极与负VCC连接，所述第二晶体管的漏极与所述第二还原电路的第一端连接，所述第二还原电路的第二端与所述AB类功率放大器的第二电源端连接；The first end of the reverse diode is used to connect to the audio signal input device, the second end of the reverse diode is connected to the first end of the second comparator, and the second end of the second comparator is connected to the first end of the second comparator. The terminal is connected to the gate of the second transistor, the source of the second transistor is connected to negative VCC, the drain of the second transistor is connected to the first terminal of the second reduction circuit, the second The second end of the restoration circuit is connected to the second power supply end of the class AB power amplifier;所述反向二极管，用于对所述音频信号进行分离处理，以得到第二音频信号；The reverse diode is used to separate and process the audio signal to obtain a second audio signal;所述第二比较器，用于对所述第二音频信号进行比较处理，以得到第二PWM信号；the second comparator, for performing comparison processing on the second audio signal to obtain a second PWM signal;所述第二晶体管，用于对所述第二PWM信号进行放大处理，以得到放大的第二PWM信号，并用于根据所述第二输出电压控制所述放大的第二PWM信号的电压为第二工作电压；The second transistor is used for amplifying the second PWM signal to obtain an amplified second PWM signal, and is used for controlling the voltage of the amplified second PWM signal to be the first according to the second output voltage. 2. Working voltage;所述第二还原电路，用于对所述放大的第二PWM信号进行还原处理，以得到放大的第二音频信号，并用于向所述AB类功率放大器输入所述第二工作电压的所述放大的第二音频信号。The second restoration circuit is used to restore the amplified second PWM signal to obtain the amplified second audio signal, and is used to input the second working voltage to the class AB power amplifier. Amplified second audio signal.6.一种音频信号的功率放大方法，其特征在于，应用于包括电源模块和功率放大器的音频信号的功率放大电路，所述功率放大器为AB类功率放大器或A类功率放大器，所述电源模块包括一个电源支路或两个电源支路，所述电源模块的每个电源支路的输入端与音频信号输入装置连接，所述电源模块的每个电源支路的输出端与功率放大器的一个电源端连接，所述功率放大器的输入端与所述音频信号输入装置连接，所述方法包括：6. A power amplifying method for an audio signal, characterized in that it is applied to a power amplifying circuit of an audio signal comprising a power module and a power amplifier, wherein the power amplifier is a class AB power amplifier or a class A power amplifier, and the power module Including one power supply branch or two power supply branches, the input end of each power supply branch of the power supply module is connected with the audio signal input device, and the output end of each power supply branch of the power supply module is connected to one of the power amplifiers. The power supply terminal is connected, the input terminal of the power amplifier is connected to the audio signal input device, and the method includes:对于所述电源模块的每个电源支路，所述电源模块向所述功率放大器输入一个工作电压；For each power supply branch of the power supply module, the power supply module inputs a working voltage to the power amplifier;所述电源模块根据所述功率放大器的输出电压，控制所述一个工作电压的绝对值大于所述输出电压的绝对值，且所述一个工作电压与所述输出电压之差的绝对值在预设范围内，以使得所述功率放大器根据所述每个电源支路的工作电压对音频信号进行功率放大。The power supply module controls the absolute value of the one working voltage to be greater than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the one working voltage and the output voltage is at a preset value. range, so that the power amplifier performs power amplification on the audio signal according to the working voltage of each power supply branch.7.根据权利要求6所述的方法，其特征在于，所述电源模块向所述功率放大器输入工作电压，包括：7. The method according to claim 6, wherein the power supply module inputs a working voltage to the power amplifier, comprising:所述电源模块通过第一电源支路向所述AB类功率放大器输入第一工作电压；the power supply module inputs a first working voltage to the class AB power amplifier through a first power supply branch;所述电源模块通过第二电源支路向所述AB类功率放大器输入第二工作电压；the power supply module inputs a second working voltage to the class AB power amplifier through a second power supply branch;相应的，所述电源模块根据所述功率放大器的输出电压，控制所述工作电压的绝对值大于所述输出电压的绝对值，且所述工作电压与所述输出电压之差的绝对值在预设范围内，包括：Correspondingly, the power supply module controls the absolute value of the working voltage to be greater than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a predetermined value. within the scope, including:所述电源模块通过第一电源支路，根据所述AB类功率放大器的第一输出电压控制所述第一工作电压大于所述第一输出电压，且所述第一工作电压与所述第一输出电压之差的绝对值在预设范围内；The power supply module controls the first working voltage to be greater than the first output voltage according to the first output voltage of the class AB power amplifier through the first power supply branch, and the first working voltage is the same as the first output voltage. The absolute value of the difference between the output voltages is within the preset range;所述电源模块通过第二电源支路，根据所述AB类功率放大器的第二输出电压控制所述第二工作电压的绝对值大于所述第二输出电压的绝对值，且所述第二工作电压与所述第二输出电压之差的绝对值在预设范围内。The power supply module controls the absolute value of the second working voltage to be greater than the absolute value of the second output voltage according to the second output voltage of the class AB power amplifier through the second power supply branch, and the second working voltage The absolute value of the difference between the voltage and the second output voltage is within a preset range.8.根据权利要求6所述的方法，其特征在于，所述电源模块向所述功率放大器输入工作电压，包括：8. The method according to claim 6, wherein the power supply module inputs a working voltage to the power amplifier, comprising:所述电源模块通过第三电源支路向所述A类功率放大器输入第三工作电压；the power supply module inputs a third working voltage to the class A power amplifier through a third power supply branch;相应的，所述电源模块根据所述功率放大器的输出电压，控制所述工作电压的绝对值大于所述输出电压的绝对值，且所述工作电压与所述输出电压之差的绝对值在预设范围内，包括：Correspondingly, the power supply module controls the absolute value of the working voltage to be greater than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a predetermined value. within the scope, including:所述电源模块通过第三电源支路，根据所述A类功率放大器的第三输出电压控制所述第三工作电压的绝对值大于所述第三输出电压的绝对值，且所述第三工作电压与所述第三输出电压之差的绝对值在预设范围内。The power supply module controls the absolute value of the third working voltage to be greater than the absolute value of the third output voltage according to the third output voltage of the class A power amplifier through the third power supply branch, and the third working voltage The absolute value of the difference between the voltage and the third output voltage is within a preset range.9.一种终端设备，其特征在于，所述终端设备包括：9. A terminal device, wherein the terminal device comprises:至少一个音频信号输出装置以及如权利要求1-5中任一项所述的音频信号的功率放大电路；At least one audio signal output device and a power amplifier circuit for audio signals as claimed in any one of claims 1-5;所述音频信号的功率放大电路用于驱动所述至少一个音频信号输出装置，以使得所述至少一个音频信号输出装置输出放大后的音频信号。The audio signal power amplifying circuit is used to drive the at least one audio signal output device, so that the at least one audio signal output device outputs an amplified audio signal.

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