CN116250376A - Control circuit, LED driver and control method - Google Patents

Abstract

The invention provides a control circuit, an LED driver and a control method. The controller is configured to output a modulation signal to the dimmable chip upon detection of the DC input, and the dimmable chip drives a switch of the transformer or the converter according to the modulation signal. Accordingly, due to the change in the switching frequency of the converter or transformer, the EMI test can be passed, and an EMI filter including a plurality of inductors is not required, and a compact size and low cost are realized.

Description

Translated fromChinese

控制电路、LED驱动器和控制方法Control circuit, LED driver and control method

技术领域technical field

本公开的实施方案整体涉及电气装置领域，并且更具体地涉及控制电路、LED驱动器和控制方法。Embodiments of the present disclosure relate generally to the field of electrical devices, and more particularly to control circuits, LED drivers, and control methods.

背景技术Background technique

本部分介绍可有利于更好地理解本公开的方面。因此，本部分的陈述应就此来阅读，并且不应理解为是对现有技术中的内容或不是现有技术中的内容的承认。This section introduces aspects that may facilitate a better understanding of the disclosure. Accordingly, the statements in this section should be read in this light and should not be construed as an admission that what is or is not prior art.

在照明领域中，越来越多的产品需要以DC(直流)紧急输入通过EMI(电磁干扰)测试，但是开关频率太恒定而不能通过EMI测试。In the field of lighting, more and more products need to pass EMI (electromagnetic interference) test with DC (direct current) emergency input, but the switching frequency is too constant to pass EMI test.

为了解决这个问题，例如，对于使用可调光芯片的产品，可以将包括多个电感器的EMI滤波器添加到产品的输入端。To solve this problem, for example, for products using dimmable chips, an EMI filter including multiple inductors can be added to the input of the product.

发明内容Contents of the invention

本公开的发明人发现包括多个电感器的EMI滤波器的尺寸大且成本高。The inventors of the present disclosure found that an EMI filter including a plurality of inductors is large in size and high in cost.

一般来讲，本公开的实施方案提供了一种控制电路、LED驱动器和控制方法。在实施方案中，控制器被配置为在检测到DC输入时向可调光芯片输出调制信号，并且可调光芯片根据调制信号驱动变压器或转换器的开关。因此，由于转换器或变压器的开关频率的改变，可以通过EMI测试，并且不需要包括多个电感器的EMI滤波器，并且实现了紧凑尺寸和低成本。In general, embodiments of the present disclosure provide a control circuit, an LED driver and a control method. In an embodiment, the controller is configured to output a modulation signal to the dimmable chip upon detection of a DC input, and the dimmable chip drives a switch of the transformer or converter according to the modulation signal. Therefore, it is possible to pass the EMI test due to a change in the switching frequency of the converter or the transformer, and an EMI filter including a plurality of inductors is not required, and compact size and low cost are achieved.

在第一方面，提供了一种控制电路，该控制电路包括：可调光芯片，该可调光芯片被配置为驱动变压器或转换器的开关；和控制器，该控制器被配置为在检测到DC输入时向可调光芯片输出调制信号，可调光芯片根据调制信号驱动开关。In a first aspect, a control circuit is provided, the control circuit includes: a dimmable chip configured to drive a switch of a transformer or a converter; and a controller configured to detect When DC is input, the modulation signal is output to the dimmable chip, and the dimmable chip drives the switch according to the modulation signal.

在一个实施方案中，当检测到DC输入时，调制信号被输出到可调光芯片的DIM引脚。In one embodiment, when a DC input is detected, the modulated signal is output to the DIM pin of the dimmable chip.

在一个实施方案中，调制信号是周期性调制信号。In one embodiment, the modulated signal is a periodically modulated signal.

在一个实施方案中，调制信号是PWM信号。In one embodiment, the modulating signal is a PWM signal.

在一个实施方案中，开关是高频开关，并且开关包括两个晶体管。In one embodiment, the switch is a high frequency switch and the switch includes two transistors.

在一个实施方案中，控制器被配置为在检测到AC输入时不向可调光芯片输出调制信号。In one embodiment, the controller is configured not to output a modulation signal to the dimmable chip when AC input is detected.

在一个实施方案中，可调光芯片被进一步配置为调整变压器或转换器的输出电流。In one embodiment, the dimmable chip is further configured to adjust the output current of the transformer or converter.

在一个实施方案中，控制器是微控制器单元(MCU)。In one embodiment, the controller is a microcontroller unit (MCU).

在第二实施方案中，提供了一种LED驱动器，该LED驱动器包括：根据第一实施方案的控制电路。In a second embodiment, there is provided an LED driver comprising: the control circuit according to the first embodiment.

在一个实施方案中，LED驱动器还包括：变压器或转换器，该变压器或转换器被配置为向由开关控制的输出端传递能量。In one embodiment, the LED driver further includes: a transformer or converter configured to deliver energy to the output controlled by the switch.

在一个实施方案中，LED驱动器还包括：检测电路，该检测电路被配置为检测LED驱动器的输入是DC输入还是AC输入。In one embodiment, the LED driver further includes: a detection circuit configured to detect whether the input of the LED driver is a DC input or an AC input.

在第三实施方案中，提供了一种LED驱动器的控制方法，该控制方法包括：当检测到DC输入时，控制器向可调光芯片输出调制信号；并且可调光芯片根据调制信号驱动变压器或转换器的开关。In a third embodiment, a control method of an LED driver is provided, the control method comprising: when a DC input is detected, the controller outputs a modulation signal to the dimmable chip; and the dimmable chip drives the transformer according to the modulation signal or converter switch.

在一个实施方案中，调制信号是周期性调制信号。In one embodiment, the modulated signal is a periodically modulated signal.

在一个实施方案中，调制信号是PWM信号。In one embodiment, the modulating signal is a PWM signal.

根据本公开的各种实施方案，控制器被配置为在检测到DC输入时向可调光芯片输出调制信号，并且可调光芯片根据调制信号驱动变压器或转换器的开关。因此，由于转换器或变压器的开关频率的改变，可以通过EMI测试，并且不需要包括多个电感器的EMI滤波器，并且实现了紧凑尺寸和低成本。According to various embodiments of the present disclosure, the controller is configured to output a modulation signal to the dimmable chip when a DC input is detected, and the dimmable chip drives a switch of the transformer or converter according to the modulation signal. Therefore, it is possible to pass the EMI test due to a change in the switching frequency of the converter or the transformer, and an EMI filter including a plurality of inductors is not required, and compact size and low cost are achieved.

附图说明Description of drawings

以举例的方式，通过以下参考附图的详细描述，本公开的各种实施方案的上述和其他方面、特征部和益处将变得更加显而易见，其中类似的附图标号或字母用于表示类似或等同的元件。附图是为了便于更好地理解本公开的实施方案而示出的并且未必按比例绘制，其中：By way of example, the above and other aspects, features and benefits of various embodiments of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings, in which like reference numerals or letters are used to denote like or Equivalent components. The accompanying drawings, which are not necessarily drawn to scale, are shown to facilitate a better understanding of embodiments of the present disclosure, in which:

图1是具有本公开的实施方案的控制电路的图示；FIG. 1 is a diagram of a control circuit having an embodiment of the present disclosure;

图2是具有本公开的实施方案的LED驱动器的图示；Figure 2 is a diagram of an LED driver having an embodiment of the present disclosure;

图3是具有本公开的实施方案的LED驱动器的电路图；3 is a circuit diagram of an LED driver having an embodiment of the present disclosure;

图4是具有本公开的实施方案的LED驱动器的控制方法的流程图。FIG. 4 is a flowchart of a control method of an LED driver with an embodiment of the present disclosure.

具体实施方式Detailed ways

现在将参考若干示例性实施方案来讨论本公开。应当理解，讨论这些实施方案的目的仅在于使得本领域的技术人员能够更好地理解本公开并因此实施本公开，而不是提出对本公开的范围的任何限制。The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that the purpose of discussing these embodiments is only to enable those skilled in the art to better understand the present disclosure and thus practice the present disclosure, rather than to propose any limitation on the scope of the present disclosure.

如本文所用，术语“第一”和“第二”是指不同的元件。除非上下文另有明确说明，否则单数形式“一个”和“一种”旨在也包括复数形式。如本文所用，术语“包括”、“包含”、“具有”和/或“含有”指定所述特征部、元件和/或部件等的存在，但不排除一种或多种其他特征部、元件、部件和/或它们的组合的存在或添加。术语“基于”应被理解为“至少部分地基于”。术语“一个实施方案”和“实施方案”应被理解为“至少一个实施方案”。术语“另一个实施方案”应被理解为“至少一个其他实施方案”。下文可包括其他明确和隐含的定义。As used herein, the terms "first" and "second" refer to different elements. The singular forms "a" and "an" are intended to include the plural forms as well, unless the context clearly dictates otherwise. As used herein, the terms "comprising", "comprising", "having" and/or "containing" specify the presence of stated features, elements and/or parts etc., but do not exclude one or more other features, elements , the presence or addition of components and/or combinations thereof. The term "based on" should be understood as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment". The term "another embodiment" is to be understood as "at least one other embodiment". Other definitions, both express and implied, may be included below.

第一实施方案first embodiment

在第一实施方案中，提供了一种控制电路。In a first embodiment, a control circuit is provided.

图1是具有本公开的实施方案的控制电路的图示。如图1所示，控制电路100包括：FIG. 1 is a diagram of a control circuit having an embodiment of the present disclosure. As shown in Figure 1, thecontrol circuit 100 includes:

可调光芯片110，该可调光芯片被配置为驱动变压器或转换器的开关；和adimmable chip 110 configured to drive a switch of a transformer or converter; and

控制器120，该控制器被配置为在检测到DC输入时向可调光芯片输出调制信号。Acontroller 120 configured to output a modulation signal to the dimmable chip when a DC input is detected.

在一个实施方案中，可调光芯片110通过驱动信号来驱动开关。例如，驱动信号由可调光芯片110的TX1和TX2引脚输出。In one embodiment, thedimmable chip 110 drives the switch through a driving signal. For example, the driving signal is output by the TX1 and TX2 pins of thedimmable chip 110 .

在一个实施方案中，控制电路100可以应用于包括可调光芯片的任何产品中，诸如LED驱动器。In one embodiment, thecontrol circuit 100 can be applied in any product including a dimmable chip, such as an LED driver.

LED驱动器可以包括变压器或转换器。LED drivers can include transformers or converters.

在一个实施方案中，变压器或转换器向由开关控制的输出端传递能量。In one embodiment, a transformer or converter transfers energy to an output controlled by a switch.

在一个实施方案中，开关是高频开关。例如，开关包括两个晶体管，诸如场效应晶体管(FET)。In one embodiment, the switch is a high frequency switch. For example, a switch includes two transistors, such as field effect transistors (FETs).

在一个实施方案中，LED驱动器可以经由可调光芯片110利用PWM(脉冲宽度调制)信号或模拟信号可调光。也就是说，可调光芯片110被进一步配置为根据PWM信号或模拟信号来调整变压器或转换器的输出电流。In one embodiment, the LED driver can be dimmable via adimmable chip 110 using a PWM (Pulse Width Modulation) signal or an analog signal. That is to say, thedimmable chip 110 is further configured to adjust the output current of the transformer or converter according to the PWM signal or the analog signal.

在一个实施方案中，可调光芯片110可以是任何类型的可调光芯片，诸如RED2821。In one embodiment, thedimmable chip 110 may be any type of dimmable chip, such as RED2821.

在一个实施方案中，控制器120根据检测信号向可调光芯片110输出调制信号。In one embodiment, thecontroller 120 outputs a modulation signal to thedimmable chip 110 according to the detection signal.

例如，当检测到DC输入时，控制器120向可调光芯片110输出调制信号。并且当检测到AC输入时，控制器120不向可调光芯片110输出调制信号。DC输入或AC输入是功率供应输入或市电供应输入。For example, when a DC input is detected, thecontroller 120 outputs a modulation signal to thedimmable chip 110 . And when an AC input is detected, thecontroller 120 does not output a modulation signal to thedimmable chip 110 . DC input or AC input is power supply input or mains supply input.

例如，当检测到DC输入时，调制信号被输出到可调光芯片的DIM引脚。For example, when DC input is detected, the modulated signal is output to the DIM pin of the dimmable chip.

例如，当检测到LED驱动器的DC输入时，控制器120的引脚不被下拉并且控制器120输出调制信号。另选地，当检测到LED驱动器的DC输入时，控制器120的引脚被下拉并且控制器120输出调制信号。For example, when the DC input of the LED driver is detected, the pin of thecontroller 120 is not pulled down and thecontroller 120 outputs a modulation signal. Alternatively, when the DC input of the LED driver is detected, the pin of thecontroller 120 is pulled down and thecontroller 120 outputs the modulation signal.

在一个实施方案中，可以使用任何检测方法来检测LED驱动器的输入是DC输入还是AC输入。In one embodiment, any detection method can be used to detect whether the input to the LED driver is a DC input or an AC input.

例如，AC电流可以通过电容器，而DC电流可以被电容器隔离，电容器的这种特性可以被应用于检测LED驱动器的输入是DC输入还是AC输入。For example, AC current can pass through a capacitor, while DC current can be isolated by the capacitor, and this characteristic of the capacitor can be applied to detect whether the input of the LED driver is a DC input or an AC input.

当输入AC时，包括电容器的通路导通并且连接到该通路的光耦合器导通，并且向控制器120的引脚提供低电平。换句话说，控制器120的引脚被下拉，并且控制器120不向可调光芯片110输出调制信号。When AC is input, a path including a capacitor is turned on and a photocoupler connected to the path is turned on, and a low level is supplied to a pin of thecontroller 120 . In other words, the pin of thecontroller 120 is pulled down, and thecontroller 120 does not output the modulation signal to thedimmable chip 110 .

当输入DC时，包括电容器的通路断开并且光耦合器断开，并且不向控制器120的引脚提供低电平。换句话说，控制器120的引脚不被下拉，并且控制器120向可调光芯片110输出调制信号。When DC is input, the path including the capacitor is disconnected and the photocoupler is disconnected, and a low level is not supplied to the pin of thecontroller 120 . In other words, the pin of thecontroller 120 is not pulled down, and thecontroller 120 outputs the modulation signal to thedimmable chip 110 .

在一个实施方案中，控制器120被配置为接收来自调光接口的信号，并且调制信号取决于来自调光接口的信号以及是否检测到DC输入。也就是说，控制器120将来自调光接口的信号以及检测信号进行组合，并且向可调光芯片110输出调制信号。In one embodiment, thecontroller 120 is configured to receive a signal from the dimming interface, and the modulated signal is dependent on the signal from the dimming interface and whether a DC input is detected. That is to say, thecontroller 120 combines the signal from the dimming interface and the detection signal, and outputs a modulation signal to thedimmable chip 110 .

在一个实施方案中，可调光芯片110根据调制信号驱动开关。In one embodiment, thedimmable chip 110 drives a switch according to a modulation signal.

在一个实施方案中，调制信号是脉冲调制信号或幅度调制信号。例如，调制信号是PWM(脉冲宽度调制)信号或脉冲持续时间调制信号或模拟信号，例如模拟信号电压电平。In one embodiment, the modulated signal is a pulse modulated signal or an amplitude modulated signal. For example, the modulation signal is a PWM (Pulse Width Modulation) signal or a Pulse Duration Modulation signal or an analog signal, eg an analog signal voltage level.

PWM信号或模拟信号的参数可以根据实际要求进行设定。The parameters of the PWM signal or the analog signal can be set according to actual requirements.

例如，可以将PWM信号的频率设定为100Hz至100kHz。For example, the frequency of the PWM signal can be set to 100 Hz to 100 kHz.

例如，可以根据输出电流的要求来调整PWM信号或模拟信号的占空比。For example, the duty cycle of a PWM signal or an analog signal can be adjusted according to the requirements of the output current.

当PWM信号或模拟信号被输入到可调光芯片110的DIM引脚时，可调光芯片110的TX1和TX2引脚可以PWM信号的高电平向开关输出驱动信号，而TX1和TX2引脚可以以PWM信号的低电平不向开关输出驱动信号。因此，根据PWM信号来驱动开关。因此，由于转换器或变压器的开关频率的改变，可以通过EMI测试。When the PWM signal or analog signal is input to the DIM pin of thedimmable chip 110, the TX1 and TX2 pins of thedimmable chip 110 can output the driving signal to the switch at the high level of the PWM signal, while the TX1 and TX2 pins The drive signal may not be output to the switch at the low level of the PWM signal. Therefore, the switches are driven according to the PWM signal. Therefore, due to the change of the switching frequency of the converter or transformer, the EMI test can be passed.

在一个实施方案中，控制器是微控制器单元(MCU)。In one embodiment, the controller is a microcontroller unit (MCU).

在一个实施方案中，控制电路的其他构造和功能可类似于相关领域中的那些，并且本文不应再进一步描述这些部件的更多细节。In one embodiment, other configurations and functions of the control circuit may be similar to those in the related art, and further details of these components shall not be further described herein.

从上述实施方案可以看出，控制器被配置为在检测到DC输入时向可调光芯片输出调制信号，并且可调光芯片根据调制信号驱动变压器或转换器的开关。因此，由于转换器或变压器的开关频率的改变，可以通过EMI测试，并且不需要包括多个电感器的EMI滤波器，并且实现了紧凑尺寸和低成本。It can be seen from the above embodiments that the controller is configured to output a modulation signal to the dimmable chip when a DC input is detected, and the dimmable chip drives a switch of a transformer or a converter according to the modulation signal. Therefore, it is possible to pass the EMI test due to a change in the switching frequency of the converter or the transformer, and an EMI filter including a plurality of inductors is not required, and compact size and low cost are achieved.

第二实施方案second embodiment

在第二实施方案中，提供了一种LED驱动器。In a second embodiment, an LED driver is provided.

图2是具有本公开的实施方案的LED驱动器的图示。Figure 2 is a diagram of an LED driver with an embodiment of the present disclosure.

如图2所示，LED驱动器10包括：As shown in Figure 2, theLED driver 10 includes:

控制电路100，该控制电路被配置为根据调制信号驱动至少一个开关，其结构和功能与第一实施方案所述的那些相同，这在本文不应再进一步描述；acontrol circuit 100 configured to drive at least one switch according to the modulation signal, the structure and function of which are the same as those described in the first embodiment, which shall not be further described herein;

检测电路200，该检测电路被配置为检测LED驱动器的输入是DC输入还是AC输入；Adetection circuit 200 configured to detect whether the input of the LED driver is a DC input or an AC input;

调光接口600，该调光接口被配置为接收调光信号并且控制LED驱动器10的输出电流或输出功率；a dimminginterface 600, the dimming interface is configured to receive a dimming signal and control the output current or output power of theLED driver 10;

转换器或变压器300，该转换器或变压器被配置为向由开关控制的输出端传递能量。A converter ortransformer 300 configured to transfer energy to an output controlled by a switch.

在一个实施方案中，LED驱动器10还可以包括滤波器电路400和整流电路500，该滤波器电路和整流电路的构造和功能可类似于相关领域中的那些，并且本文不应再进一步描述这些部件的更多细节。In one embodiment, theLED driver 10 can also include afilter circuit 400 and arectification circuit 500, the construction and function of the filter circuit and the rectification circuit can be similar to those in the related art, and these components should not be further described herein more details of .

在一个实施方案中，LED驱动器10可以用于驱动作为输出负载的LED 20。LED驱动器10可以根据由调光接口600接收的调光信号来控制供应给LED 20的电流、电压或功率。控制电路100可以将从检测电路200和调光接口600接收的两个信号进行组合，并且可以根据两个信号的组合来驱动开关。In one embodiment,LED driver 10 may be used to driveLED 20 as an output load. TheLED driver 10 may control the current, voltage or power supplied to theLED 20 according to the dimming signal received by the dimminginterface 600 . Thecontrol circuit 100 may combine the two signals received from thedetection circuit 200 and the dimminginterface 600, and may drive a switch according to the combination of the two signals.

图3是具有本公开的实施方案的LED驱动器的电路图。Figure 3 is a circuit diagram of an LED driver having an embodiment of the present disclosure.

如图3所示，作为用于LED驱动器的集成控制芯片的一个示例的可调光芯片RED2821和微控制器单元MCU构成控制电路100。As shown in FIG. 3 , a dimmable chip RED2821 as an example of an integrated control chip for an LED driver and a microcontroller unit MCU constitute acontrol circuit 100 .

当输入AC时，包括电容器C1的通路导通并且连接到该通路的光耦合器导通，并且向MCU 120的引脚提供低电平。并且MCU不向可调光芯片RED2821的DIM引脚输出PWM信号或模拟信号，可调光芯片RED2821的TX1和TX2引脚向由晶体管Q1和Q2构成的开关输出驱动信号，并且开关工作。When AC is input, the path including the capacitor C1 is turned on and the photocoupler connected to the path is turned on, and a low level is supplied to the pin of theMCU 120 . And the MCU does not output PWM signal or analog signal to the DIM pin of the dimmable chip RED2821, the TX1 and TX2 pins of the dimmable chip RED2821 output the drive signal to the switch composed of transistors Q1 and Q2, and the switch works.

当输入DC时，包括电容器C1的路径断开并且光耦合器断开，并且不向MCU的引脚提供低电平。然后，MCU根据来自调光接口的信号(DIM+和DIM-)向可调光芯片RED2821的DIM引脚输出PWM信号或模拟信号。调光接口600优选地被设计为接收调光控制信号，例如1V-10V调光信号。当PWM信号或模拟信号被输入到可调光芯片110的DIM引脚时，可调光芯片RED2821的TX1和TX2引脚以PWM信号或模拟信号的高电平向开关输出驱动信号，而TX1和TX2引脚以PWM信号或模拟信号的低电平不向开关输出驱动信号。因此，开关根据PWM信号或模拟信号被驱动并工作。When DC is input, the path including the capacitor C1 is disconnected and the optocoupler is disconnected, and no low level is supplied to the pin of the MCU. Then, the MCU outputs PWM signal or analog signal to the DIM pin of the dimmable chip RED2821 according to the signal from the dimming interface (DIM+ and DIM-). The dimminginterface 600 is preferably designed to receive dimming control signals, such as 1V-10V dimming signals. When the PWM signal or the analog signal is input to the DIM pin of thedimmable chip 110, the TX1 and TX2 pins of the dimmable chip RED2821 output the driving signal to the switch with the high level of the PWM signal or the analog signal, while TX1 and The TX2 pin does not output a drive signal to the switch with a PWM signal or a low level of an analog signal. Therefore, the switch is driven and operated according to a PWM signal or an analog signal.

在一个实施方案中，LED驱动器的其他构造和功能可类似于相关领域中的那些，并且本文不应再进一步描述这些部件的更多细节。In one embodiment, other configurations and functions of the LED driver may be similar to those in the related art, and further details of these components shall not be further described herein.

从上述实施方案可以看出，控制器被配置为在检测到DC输入时向可调光芯片输出调制信号，并且可调光芯片根据调制信号驱动变压器或转换器的开关。因此，由于转换器或变压器的开关频率的改变，可以通过EMI测试，并且不需要包括多个电感器的EMI滤波器，并且实现了紧凑尺寸和低成本。It can be seen from the above embodiments that the controller is configured to output a modulation signal to the dimmable chip when a DC input is detected, and the dimmable chip drives a switch of a transformer or a converter according to the modulation signal. Therefore, it is possible to pass the EMI test due to a change in the switching frequency of the converter or the transformer, and an EMI filter including a plurality of inductors is not required, and compact size and low cost are achieved.

第三实施方案third embodiment

在第三实施方案中提供了一种LED驱动器的控制方法，该控制方法对应于第一实施方案中描述的控制电路。In the third embodiment there is provided a control method of an LED driver, which corresponds to the control circuit described in the first embodiment.

图4是具有本公开的实施方案的LED驱动器的控制方法的流程图。如图4所示，该方法包括：FIG. 4 is a flowchart of a control method of an LED driver with an embodiment of the present disclosure. As shown in Figure 4, the method includes:

步骤401：当检测到DC输入时，控制器向可调光芯片输出调制信号；和Step 401: When a DC input is detected, the controller outputs a modulation signal to the dimmable chip; and

步骤402：可调光芯片根据调制信号驱动变压器或转换器的开关。Step 402: The dimmable chip drives the switch of the transformer or converter according to the modulation signal.

在一个实施方案中，调制信号是脉冲调制信号或幅度调制信号。例如，调制信号是PWM信号或模拟信号。In one embodiment, the modulated signal is a pulse modulated signal or an amplitude modulated signal. For example, the modulation signal is a PWM signal or an analog signal.

在一个实施方案中，针对上述步骤的具体实施方式，可以参考第一实施方案中所描述的内容，这在本文不应再进一步描述。In one embodiment, for the specific implementation of the above steps, reference may be made to the content described in the first embodiment, which shall not be further described herein.

从上述实施方案可以看出，控制器被配置为在检测到DC输入时向可调光芯片输出调制信号，并且可调光芯片根据调制信号驱动变压器或转换器的开关。因此，由于转换器或变压器的开关频率的改变，可以通过EMI测试，并且不需要包括多个电感器的EMI滤波器，并且实现了紧凑尺寸和低成本。It can be seen from the above embodiments that the controller is configured to output a modulation signal to the dimmable chip when a DC input is detected, and the dimmable chip drives a switch of a transformer or a converter according to the modulation signal. Therefore, it is possible to pass the EMI test due to a change in the switching frequency of the converter or the transformer, and an EMI filter including a plurality of inductors is not required, and compact size and low cost are achieved.

一般来讲，虽然操作以特定次序示出，但不应将这种情况理解为需要以所示的特定次序或以相继次序来执行此类操作或者需要执行所有所示的操作才能实现期望的结果。在某些情况下，多任务和并行处理可能是有利的。同样，虽然若干具体实施细节包含在上述讨论中，但这些具体实施细节不应被理解为对本公开的范围的限制，而是应被理解为可能特定于具体实施方案的特征部的描述。在单独实施方案的上下文中描述的某些特征部也可以在单个实施方案中组合地实现。相反，在单个实施方案的上下文中描述的各种特征部也可单独地或者以任何合适的子组合的形式在多个实施方案中实现。In general, while operations are shown in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown, or in sequential order, or that all illustrated operations be performed, to achieve desirable results . In some cases, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to particular implementations. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.

尽管以特定于结构特征部和/或方法动作的语言对本公开进行了描述，但应当理解，以所附权利要求书限定的本公开并不一定限于上述的特定特征部或动作。相反，上文所述的特定特征部和动作被公开为实现权利要求的示例性形式。Although the disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (15)

Translated fromChinese

1.一种控制电路，包括：1. A control circuit comprising:可调光芯片，所述可调光芯片被配置为驱动变压器或转换器的开关；和a dimmable chip configured to drive a switch of a transformer or converter; and控制器，所述控制器被配置为在检测到DC输入时向所述可调光芯片输出调制信号，a controller configured to output a modulation signal to the dimmable chip when a DC input is detected,所述可调光芯片根据所述调制信号驱动所述开关。The dimmable chip drives the switch according to the modulation signal.2.根据权利要求1所述的控制电路，其中，2. The control circuit according to claim 1, wherein,所述控制器被配置为接收来自调光接口的信号，并且所述调制信号取决于所述来自调光接口的信号以及是否检测到DC输入。The controller is configured to receive a signal from the dimming interface, and the modulation signal is dependent on the signal from the dimming interface and whether a DC input is detected.3.根据权利要求1或2所述的控制电路，其中，3. The control circuit according to claim 1 or 2, wherein,当检测到DC输入时，所述调制信号被输出到所述可调光芯片的DIM引脚。When a DC input is detected, the modulation signal is output to the DIM pin of the dimmable chip.4.根据权利要求1或2所述的控制电路，其中，4. The control circuit according to claim 1 or 2, wherein,所述调制信号是脉冲调制信号或幅度调制信号。The modulation signal is a pulse modulation signal or an amplitude modulation signal.5.根据权利要求4所述的控制电路，其中，5. The control circuit according to claim 4, wherein,所述调制信号是PWM信号或模拟信号。The modulation signal is a PWM signal or an analog signal.6.根据权利要求1所述的控制电路，其中，6. The control circuit according to claim 1, wherein,所述开关是高频开关，The switch is a high frequency switch,并且所述开关包括两个晶体管。And the switch includes two transistors.7.根据权利要求1所述的控制电路，其中，7. The control circuit according to claim 1, wherein,所述控制器被配置为在检测到AC输入时不向所述可调光芯片输出所述调制信号。The controller is configured not to output the modulation signal to the dimmable chip when an AC input is detected.8.根据权利要求1所述的控制电路，其中，8. The control circuit according to claim 1, wherein,所述可调光芯片被进一步配置为调整所述变压器或所述转换器的输出电流。The dimmable chip is further configured to adjust the output current of the transformer or the converter.9.根据权利要求1所述的控制电路，其中，9. The control circuit according to claim 1, wherein,所述控制器是微控制器单元(MCU)。The controller is a microcontroller unit (MCU).10.一种LED驱动器，包括：10. An LED driver comprising:根据权利要求1至9中任一项所述的控制电路。A control circuit according to any one of claims 1 to 9.11.根据权利要求10所述的LED驱动器，其中，所述LED驱动器还包括：11. The LED driver according to claim 10, wherein the LED driver further comprises:调光接口，所述调光接口被配置为接收调光信号并且控制所述LED驱动器的输出电流或输出功率。a dimming interface configured to receive a dimming signal and control the output current or output power of the LED driver.12.根据权利要求10或11所述的LED驱动器，其中，所述LED驱动器还包括：12. The LED driver according to claim 10 or 11, wherein the LED driver further comprises:变压器或转换器，所述变压器或转换器被配置为向由所述开关控制的输出端传递能量；和a transformer or converter configured to transfer energy to an output controlled by the switch; and检测电路，所述检测电路被配置为检测所述LED驱动器的输入是DC输入还是AC输入。A detection circuit configured to detect whether the input of the LED driver is a DC input or an AC input.13.一种LED驱动器的控制方法，所述控制方法包括：13. A control method for an LED driver, the control method comprising:当检测到DC输入时，控制器向可调光芯片输出调制信号；并且When a DC input is detected, the controller outputs a modulation signal to the dimmable chip; and所述可调光芯片根据所述调制信号驱动变压器或转换器的开关。The dimmable chip drives a switch of a transformer or a converter according to the modulation signal.14.根据权利要求13所述的控制方法，其中，14. The control method according to claim 13, wherein,所述调制信号是脉冲调制信号或幅度调制信号。The modulation signal is a pulse modulation signal or an amplitude modulation signal.15.根据权利要求13或14所述的控制方法，其中，15. The control method according to claim 13 or 14, wherein,所述调制信号是PWM信号或模拟信号。The modulation signal is a PWM signal or an analog signal.

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