CN115514195A - Power supply control circuit, power supply circuit control method and electronic device - Google Patents
Power supply control circuit, power supply circuit control method and electronic deviceDownload PDFInfo
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- CN115514195A CN115514195ACN202110631894.4ACN202110631894ACN115514195ACN 115514195 ACN115514195 ACN 115514195ACN 202110631894 ACN202110631894 ACN 202110631894ACN 115514195 ACN115514195 ACN 115514195A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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Abstract
Description
Translated fromChinese技术领域technical field
本申请涉及电路领域，尤其涉及一种电源控制电路、电源电路控制方法和电子设备。The present application relates to the field of circuits, in particular to a power supply control circuit, a power supply circuit control method and electronic equipment.
背景技术Background technique
电源是向电子设备提供功率的装置，也称电源供应器，它可以将交流电转换为稳定的直流电。电源所能提供的电流和电压的稳定性，直接影响电子设备的工作性能和使用寿命。A power supply is a device that provides power to electronic equipment, also known as a power supply, which can convert alternating current into stable direct current. The stability of the current and voltage that the power supply can provide directly affects the working performance and service life of electronic equipment.
传统反激式电源控制电路会工作在深度连续状态，导致整个电路中电压电流振荡严重，引起变压器、MOS管、二极管等功率器件温升超标，应力超标，致使电源寿命缩减。The traditional flyback power supply control circuit will work in a deep continuous state, resulting in serious voltage and current oscillations in the entire circuit, causing excessive temperature rise and stress of power devices such as transformers, MOS tubes, and diodes, resulting in shortened power supply life.
发明内容Contents of the invention
本申请实施例提供了一种电源控制电路、电源电路控制方法和电子设备，可以工作在断续状态，解决电路中功率器件应力超标的问题。Embodiments of the present application provide a power supply control circuit, a power supply circuit control method and electronic equipment, which can work in an intermittent state and solve the problem of excessive stress of power devices in the circuit.
所述技术方案如下：Described technical scheme is as follows:
第一方面，本申请实施例提供了一种电源控制电路，用于为负载供电，所述电路包括：电源回路、恒流回路、恒压回路、控制电路；In the first aspect, the embodiment of the present application provides a power supply control circuit for supplying power to a load, and the circuit includes: a power supply loop, a constant current loop, a constant voltage loop, and a control circuit;
所述电源回路分别与所述恒流回路和恒压回路耦合连接，用于为所述恒流回路与所述恒压回路提供能量；The power supply circuit is respectively coupled and connected to the constant current circuit and the constant voltage circuit for providing energy for the constant current circuit and the constant voltage circuit;
所述控制电路的第一输出端与所述电源回路连接，用于控制所述电源回路周期性地导通和关断；The first output terminal of the control circuit is connected to the power circuit, and is used to control the power circuit to be turned on and off periodically;
所述控制电路的第二输出端与所述恒流回路连接，用于在每个周期中检测到电流需求信号且检测到所述电源回路断开时，控制所述恒流回路导通，以为所述负载提供恒定电流；The second output terminal of the control circuit is connected to the constant current loop, and is used to control the conduction of the constant current loop when a current demand signal is detected in each cycle and the power supply loop is disconnected, so as to The load provides a constant current;
所述控制电路的第三输出端与所述恒压回路连接，用于在每个周期中检测到电压需求信号且检测到所述电源回路断开时，控制所述恒压回路导通，以为所述负载提供恒定电压。The third output terminal of the control circuit is connected to the constant voltage circuit, and is used to control the conduction of the constant voltage circuit when a voltage demand signal is detected in each cycle and the power supply circuit is disconnected, so as to The load provides a constant voltage.
可选的，所述恒流回路包括：变压器的第一次级绕组、第一开关管、第一储能电容；Optionally, the constant current loop includes: a first secondary winding of a transformer, a first switch tube, and a first energy storage capacitor;
所述第一次级绕组的第一输出端经由所述第一储能电容、所述第一开关管的输入端和所述第一开关管的输出端连接至所述第一次级绕组的第二输出端；所述第一储能电容与所述负载并联，为所述负载提供恒定电流；The first output terminal of the first secondary winding is connected to the first secondary winding via the first energy storage capacitor, the input terminal of the first switching transistor, and the output terminal of the first switching transistor. The second output terminal; the first energy storage capacitor is connected in parallel with the load to provide a constant current for the load;
所述控制电路的第二输出端连接所述第一开关管的使能端，用于控制所述第一开关管的导通或截止，进而控制所述恒流回路导通或断开。The second output terminal of the control circuit is connected to the enable terminal of the first switch tube, and is used to control the turn-on or cut-off of the first switch tube, and then control the turn-on or turn-off of the constant current loop.
可选的，所述恒压回路包括：变压器的第二次级绕组、第二开关管、第二储能电容；Optionally, the constant voltage circuit includes: a second secondary winding of a transformer, a second switch tube, and a second energy storage capacitor;
所述第二次级绕组的第一输出端经由所述第二开关管的输入端、所述第二开关管的输出端和所述第二储能电容连接至所述第二次级绕组的第二输出端；所述第二储能电容与所述负载并联，为所述负载提供恒定电压；The first output end of the second secondary winding is connected to the second secondary winding via the input end of the second switching transistor, the output end of the second switching transistor, and the second energy storage capacitor. a second output terminal; the second energy storage capacitor is connected in parallel with the load to provide a constant voltage for the load;
所述控制电路的第三输出端连接所述第二开关管的使能端，用于控制所述第二开关管的导通或截止，进而控制所述恒压回路导通或断开。The third output terminal of the control circuit is connected to the enable terminal of the second switch tube, and is used to control the turn-on or cut-off of the second switch tube, and then control the turn-on or turn-off of the constant voltage circuit.
可选的，所述电源回路包括：变压器的初级绕组、第三开关管、第三储能电容；Optionally, the power circuit includes: a primary winding of a transformer, a third switch tube, and a third energy storage capacitor;
所述初级绕组的第一输出端经由所述第三储能电容、所述第三开关管的输入端、所述第三开关管的输出端连接至所述初级绕组的第二输出端；The first output end of the primary winding is connected to the second output end of the primary winding via the third energy storage capacitor, the input end of the third switching transistor, and the output end of the third switching transistor;
所述控制电路的第一输出端连接所述第三开关管的使能端，用于控制所述第三开关管的导通或截止，进而控制所述电源回路导通或断开。The first output terminal of the control circuit is connected to the enable terminal of the third switch tube, and is used to control the turn-on or cut-off of the third switch tube, and then control the turn-on or turn-off of the power circuit.
可选的，所述第一开关管为恒流MOS管；所述第一开关管的使能端为所述恒流MOS管的栅极；所述第一开关管的输入端为所述恒流MOS管的源极；所述第一开关管的输出端为所述恒流MOS管的漏极；Optionally, the first switch tube is a constant current MOS tube; the enabling terminal of the first switch tube is the gate of the constant current MOS tube; the input terminal of the first switch tube is the constant current MOS tube. The source of the current MOS tube; the output end of the first switch tube is the drain of the constant current MOS tube;
所述第二开关管为恒压MOS管；所述第二开关管的使能端为所述恒压MOS管的栅极；所述第二开关管的输入端为所述恒压MOS管的漏极；所述第二开关管的输出端为所述恒压MOS管的源极；The second switch tube is a constant voltage MOS tube; the enabling terminal of the second switch tube is the gate of the constant voltage MOS tube; the input terminal of the second switch tube is the gate of the constant voltage MOS tube a drain; the output end of the second switching tube is the source of the constant voltage MOS tube;
所述第三开关管为原边MOS管；所述第三开关管的使能端为所述原边MOS管的栅极；所述第三开关管的输入端为所述原边MOS管的漏极；所述第三开关管的输出端为所述原边MOS管的源极。The third switching tube is a primary MOS tube; the enable terminal of the third switching tube is the gate of the primary MOS tube; the input terminal of the third switching tube is the gate of the primary MOS tube Drain; the output end of the third switch tube is the source of the primary side MOS tube.
可选的，所述控制回路具体用于：Optionally, the control loop is specifically used for:
在每个周期开始时，控制所述原边MOS导通，同时控制所述恒流MOS管或所述恒压MOS管关断；At the beginning of each cycle, the primary side MOS is controlled to be turned on, and the constant current MOS transistor or the constant voltage MOS transistor is controlled to be turned off;
在原边MOS导通时间结束后，控制所述原边MOS管关断，同时控制所述恒流MOS管或所述恒压MOS管导通；After the primary-side MOS conduction time ends, control the primary-side MOS transistor to turn off, and simultaneously control the constant-current MOS transistor or the constant-voltage MOS transistor to turn on;
可选的，所述恒流回路还包括：第一采样元件，用于对所述恒流回路的电流进行采样；Optionally, the constant current loop further includes: a first sampling element, configured to sample the current of the constant current loop;
所述恒压回路还包括：第二采样元件，用于对所述恒压回路的电压进行采样；The constant voltage loop further includes: a second sampling element, configured to sample the voltage of the constant voltage loop;
所述控制回路具体用于根据采样的电流或采样的电压判断原边MOS导通时间是否结束。The control loop is specifically used to judge whether the conduction time of the primary MOS is over according to the sampled current or the sampled voltage.
第二方面，本申请实施例提供了一种电子设备，包括：如第一方面所述的电源控制电路和负载；In the second aspect, the embodiment of the present application provides an electronic device, including: the power control circuit and the load as described in the first aspect;
所述电源控制电路与所述负载连接，为所述负载提供恒定电流和/或恒定电压。The power control circuit is connected with the load, and provides constant current and/or constant voltage for the load.
第三方面，本申请实施例提供了一种电源电路控制方法，应用于如第一方面所述的电源控制电路，所述方法包括：In a third aspect, an embodiment of the present application provides a power circuit control method, which is applied to the power control circuit described in the first aspect, and the method includes:
检测到达周期开始时刻，控制电源回路导通，同时控制恒流回路或恒压回路断开；When the detection reaches the beginning of the cycle, the control power circuit is turned on, and the constant current circuit or constant voltage circuit is controlled to be disconnected at the same time;
检测到电源回路导通时间结束后，控制电源回路断开，同时控制恒流回路或恒压回路导通。After detecting that the conduction time of the power circuit is over, the control power circuit is disconnected, and the constant current circuit or constant voltage circuit is controlled to be turned on at the same time.
可选的，所述方法还包括：Optionally, the method also includes:
对所述恒流回路的电流进行采样或对所述恒压回路的电压进行采样；Sampling the current of the constant current loop or sampling the voltage of the constant voltage loop;
根据采样的电流或采样的电压判断电源回路导通时间是否结束。According to the sampled current or the sampled voltage, it is judged whether the conduction time of the power loop is over.
第四方面，本申请实施例提供一种计算机存储介质，所述计算机存储介质存储有多条指令，所述指令适于由处理器加载并执行上述的方法步骤。In a fourth aspect, an embodiment of the present application provides a computer storage medium, where a plurality of instructions are stored in the computer storage medium, and the instructions are adapted to be loaded by a processor and execute the above method steps.
在本申请实施例中，提供了一种电源控制电路、电源电路控制方法和电子设备。本申请实施例提供的电源控制电路，用于为负载供电，包括：电源回路、恒流回路、恒压回路、控制电路；所述电源回路分别与所述恒流回路和恒压回路耦合连接，用于为所述恒流回路与所述恒压回路提供能量；所述控制电路的第一输出端与所述电源回路连接，用于控制所述电源回路周期性地导通和关断；所述控制电路的第二输出端与所述恒流回路连接，用于在每个周期中检测到电流需求信号且检测到所述电源回路断开时，控制所述恒流回路导通，以为所述负载提供恒定电流；所述控制电路的第三输出端与所述恒压回路连接，用于在每个周期中检测到电压需求信号且检测到所述电源回路断开时，控制所述恒压回路导通，以为所述负载提供恒定电压。在本申请实施例提供的电源控制电路中，在一个周期内，电源回路导通一次后恒流电路或恒压电路其一导通一次，使电路可以在一次充电后完全放电工作在断续状态，解决电路中功率器件应力超标的问题。In the embodiments of the present application, a power supply control circuit, a power supply circuit control method, and electronic equipment are provided. The power supply control circuit provided in the embodiment of the present application is used to supply power to the load, including: a power supply loop, a constant current loop, a constant voltage loop, and a control circuit; the power supply loop is coupled and connected to the constant current loop and the constant voltage loop respectively, It is used to provide energy for the constant current loop and the constant voltage loop; the first output terminal of the control circuit is connected to the power supply loop, and is used to control the power supply loop to be turned on and off periodically; The second output terminal of the control circuit is connected to the constant current loop, and is used to control the conduction of the constant current loop when the current demand signal is detected in each cycle and the power supply loop is disconnected, so that the The load provides a constant current; the third output terminal of the control circuit is connected to the constant voltage circuit, and is used to control the constant voltage circuit when a voltage demand signal is detected in each cycle and the power supply circuit is disconnected. The voltage loop is turned on to provide a constant voltage to the load. In the power supply control circuit provided in the embodiment of the present application, in one cycle, one of the constant current circuit or the constant voltage circuit is turned on once after the power circuit is turned on once, so that the circuit can be fully discharged after one charge and work in an intermittent state , to solve the problem of excessive stress of power devices in the circuit.
附图说明Description of drawings
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为本申请提供的一种传统的电源驱动电路的电路图；Fig. 1 is a circuit diagram of a traditional power drive circuit provided by the present application;
图2为本申请提供的一种应用场景示意图；FIG. 2 is a schematic diagram of an application scenario provided by the present application;
图3为本申请一实施例提供的一种电源控制电路的电路图；FIG. 3 is a circuit diagram of a power supply control circuit provided by an embodiment of the present application;
图4为本申请一实施例提供的另一种电源控制电路的电路图；FIG. 4 is a circuit diagram of another power supply control circuit provided by an embodiment of the present application;
图5为本申请一实施例提供的一种电子设备的结构示意图；FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present application;
图6为本申请一实施例提供的一种电源电路控制方法的流程图。FIG. 6 is a flow chart of a method for controlling a power supply circuit provided by an embodiment of the present application.
具体实施方式detailed description
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施例方式作进一步地详细描述。In order to make the purpose, technical solution and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.
应当明确，所描述的实施例仅仅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它实施例，都属于本申请保护的范围。It should be clear that the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.
在本申请的描述中，需要理解的是，术语“第一”、“第二”、“第三”等仅用于区别类似的对象，而不必用于描述特定的顺序或先后次序，也不能理解为指示或暗示相对重要性。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。此外，在本申请的描述中，除非另有说明，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be Read as indicating or implying relative importance. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations. In addition, in the description of the present application, unless otherwise specified, "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship.
图1为本申请提供的一种传统的反激式电源控制电路的电路图。如图1所示的，传统的反激式电源控制电路包括电源驱动回路101、恒流驱动回路102和恒压驱动回路103。具体的，电源驱动回路101包括MOS管Q1和电容C1，通过反激式变压器T的初级绕组与恒流驱动回路102和恒压驱动回路103耦合连接；恒流驱动回路102包括MOS管Q2、电容C2和二极管D1，通过反激式变压器T的次级绕组与电源驱动回路101耦合连接；恒压驱动回路103包括电容C3和二级管D2，通过反激式变压器T的次级绕组与电源驱动回路101耦合连接。各器件的具体连接关系如图1所示。FIG. 1 is a circuit diagram of a traditional flyback power supply control circuit provided by the present application. As shown in FIG. 1 , a traditional flyback power control circuit includes a
反激式变压器T的初级绕组被激励时，次级绕组不向负载提供功率输出，而只在初级绕组的激励被关断后，次级绕组才向负载提供功率输出。When the primary winding of the flyback transformer T is excited, the secondary winding does not provide power output to the load, and only after the excitation of the primary winding is turned off, the secondary winding provides power output to the load.
在工作状态，该电路的工作过程如下：当MOS管Q1导通，且二极管D1截止时，反激式变压器T的初级绕组被激励，储存能量；当MOS管Q1截止，且二极管D1导通，MOS管Q2导通时，反激式变压器T的初级绕组激励被关断，次级绕组释放能量，恒流驱动回路导通，为负载提供恒定电流，二极管D2截止，恒压回路断开；当MOS管Q2关断，恒流驱动回路断开，二极管D2导通，次级绕组继续释放能量，恒压驱动回路导通，为负载提供恒定电压。In the working state, the working process of the circuit is as follows: when the MOS transistor Q1 is turned on and the diode D1 is turned off, the primary winding of the flyback transformer T is excited to store energy; when the MOS transistor Q1 is turned off and the diode D1 is turned on, When the MOS transistor Q2 is turned on, the excitation of the primary winding of the flyback transformer T is turned off, the secondary winding releases energy, the constant current drive circuit is turned on, and a constant current is provided for the load, the diode D2 is cut off, and the constant voltage circuit is disconnected; The MOS transistor Q2 is turned off, the constant current drive circuit is disconnected, the diode D2 is turned on, the secondary winding continues to release energy, the constant voltage drive circuit is turned on, and a constant voltage is provided for the load.
即在一个周期内，变压器储能一次，恒流驱动回路与恒压驱动回路交替导通释放能量。因此，在恒流驱动回路导通期间，变压器能量必定不能完全释放，导致电路工作在深度连续状态，整个电路中电压电流振荡严重，引起变压器、MOS管、二极管等功率器件温升超标，应力超标，致使电源寿命缩减。That is, in one cycle, the transformer stores energy once, and the constant current drive circuit and the constant voltage drive circuit are alternately turned on to release energy. Therefore, during the conduction period of the constant current drive circuit, the energy of the transformer must not be fully released, causing the circuit to work in a deep continuous state, and the voltage and current oscillations in the entire circuit are serious, causing the temperature rise and stress of power devices such as transformers, MOS tubes, and diodes to exceed the standard. , resulting in reduced power supply life.
基于传统电源的缺陷，本申请实施例提供了一种新的电源控制电路、应用此电源控制电路的电子设备和此电源控制电路所适用的电源电路控制方法。以期通过改变电路结构和电路控制方法，改变电路工作时序，使电路可工作在断续状态，减少电路中电压电流的振荡，避免功率器件过热。Based on the defects of the traditional power supply, the embodiment of the present application provides a new power control circuit, an electronic device using the power control circuit, and a power circuit control method applicable to the power control circuit. It is hoped that by changing the circuit structure and circuit control method, the working sequence of the circuit can be changed, so that the circuit can work in an intermittent state, reduce the oscillation of voltage and current in the circuit, and avoid overheating of power devices.
图2为本申请提供的一种应用场景示意图。如图2所示的，显示设备201通过电源适配器202接入市电，电源适配器202中使用本申请提供的电源控制电路，基于此电路，将市电进行转化，为显示设备201提供恒定电压和/或恒定电流，以使显示设备201正常工作。FIG. 2 is a schematic diagram of an application scenario provided by the present application. As shown in Figure 2, the
具体的实现方式可以参考以下实施例。For specific implementation manners, reference may be made to the following embodiments.
图3为本申请一实施例提供的一种电源控制电路的电路结构示意图，用于为负载300供电，该电路包括：电源回路301、恒流回路302、恒压回路303、控制电路304；电源回路301分别与恒流回路302和恒压回路303耦合连接，用于为恒流回路302与恒压回路303提供能量；控制电路304的第一输出端与电源回路301连接，用于控制电源回路301周期性地导通和关断；控制电路304的第二输出端与恒流回路302连接，用于在每个周期中检测到电流需求信号且检测到电源回路301断开时，控制恒流回路302导通，以为负载提供恒定电流；控制电路304的第三输出端与恒压回路303连接，用于在每个周期中检测到电压需求信号且检测到电源回路301断开时，控制恒压回路303导通，以为负载300提供恒定电压。Figure 3 is a schematic diagram of the circuit structure of a power supply control circuit provided by an embodiment of the present application, which is used to supply power to a
控制电路304通过第一输出端控制电源回路301周期性地导通和关断，也即，在每个周期中，电源回路301有一段导通时间和一段关断时间。当电源回路301导通时储能，恒流回路302与恒压回路303断开；当电源回路301断开，根据检测到的需求信号的不同，选择性地导通恒流回路302与恒压回路303其中一个，电源回路301为导通的回路提供能量，以为负载300提供所需要的恒压或恒流。也就是说，在一个周期内，电源回路储能一次，之后通过恒压回路或恒流回路释放能量一次。基于此电路，只需要将电源回路301的导通时间和关断时间进行调整，就可以使一个周期内储存的能量完全释放，工作在断续状态，从而避免电路中电压电流振荡严重引起的功率器件温升超标，应力超标等问题。The
图4为本申请一实施例提供的另一种电源控制电路的电路图。如图4所示的，恒流回路302的具体结构可以包括：变压器T4的第一次级绕组、第一开关管Q41、第一储能电容C41。其中，第一次级绕组的第一输出端经由第一储能电容C41、第一开关管Q41的输入端和第一开关管Q41的输出端连接至第一次级绕组的第二输出端；第一储能电容C41与负载300并联，为负载300提供恒定电流；控制电路的第二输出端连接第一开关管Q41的使能端，用于控制第一开关管Q41的导通或截止，进而控制恒流回路导通或断开。FIG. 4 is a circuit diagram of another power control circuit provided by an embodiment of the present application. As shown in FIG. 4 , the specific structure of the constant
恒压回路303的具体结构可以包括：变压器T4的第二次级绕组、第二开关管Q42、第二储能电容C42。其中，第二次级绕组的第一输出端经由第二开关管Q42的输入端、第二开关管Q42的输出端和第二储能电容C42连接至第二次级绕组的第二输出端；第二储能电容C42与负载300并联，为负载300提供恒定电压；控制电路的第三输出端连接第二开关管Q42的使能端，用于控制第二开关管Q42的导通或截止，进而控制恒压回路导通或断开。The specific structure of the
电源回路301的具体结构可以包括：变压器T4的初级绕组、第三开关管Q43、第三储能电容C43；初级绕组的第一输出端经由第三储能电容C43、第三开关管Q43的输入端、第三开关管Q43的输出端连接至初级绕组的第二输出端；控制电路的第一输出端连接第三开关管Q43的使能端，用于控制第三开关管Q43的导通或截止，进而控制电源回路导通或断开。The specific structure of the
控制回路通过输出PWM控制信号，即可控制各回路中开关管的导通与截止，进而控制各回路的通断。The control circuit can control the on and off of the switching tubes in each circuit by outputting the PWM control signal, and then control the on-off of each circuit.
在一些实施例中，上述的第一开关管Q41可以为恒流MOS管；第一开关管Q41的使能端为恒流MOS管的栅极；第一开关管Q41的输入端为恒流MOS管的源极；第一开关管Q41的输出端为恒流MOS管的漏极。上述的第二开关管Q42为恒压MOS管；第二开关管Q42的使能端为恒压MOS管的栅极；第二开关管Q42的输入端为恒压MOS管的漏极；第二开关管Q42的输出端为恒压MOS管的源极。上述的第三开关管Q43为原边MOS管；第三开关管Q43的使能端为原边MOS管的栅极；第三开关管Q43的输入端为原边MOS管的漏极；第三开关管Q43的输出端为原边MOS管的源极。In some embodiments, the above-mentioned first switching tube Q41 can be a constant current MOS tube; the enabling terminal of the first switching tube Q41 is the gate of the constant current MOS tube; the input terminal of the first switching tube Q41 is a constant current MOS tube The source of the tube; the output end of the first switching tube Q41 is the drain of the constant current MOS tube. The above-mentioned second switch tube Q42 is a constant voltage MOS tube; the enabling terminal of the second switch tube Q42 is the gate of the constant voltage MOS tube; the input terminal of the second switch tube Q42 is the drain of the constant voltage MOS tube; The output end of the switch tube Q42 is the source of the constant voltage MOS tube. The above-mentioned third switching tube Q43 is a primary side MOS tube; the enabling terminal of the third switching tube Q43 is the gate of the primary side MOS tube; the input terminal of the third switching tube Q43 is the drain of the primary side MOS tube; The output terminal of the switch tube Q43 is the source of the primary side MOS tube.
需要说明的是，上述的第一开关管Q41、第二开关管Q42、第三开关管Q43都可以为MOS管，这里根据所在回路功能使用“恒流MOS管”“恒压MOS管”“原边MOS管”加以区分，并不对MOS管的型号构成限定。It should be noted that the above-mentioned first switching tube Q41, second switching tube Q42, and third switching tube Q43 can all be MOS tubes. "side MOS tube" is distinguished, and does not limit the type of MOS tube.
基于上述实施例，控制回路具体用于：在每个周期开始时，控制原边MOS导通，同时控制恒流MOS管或恒压MOS管关断；在原边MOS导通时间结束后，控制原边MOS管关断，同时控制恒流MOS管或恒压MOS管导通。Based on the above-mentioned embodiments, the control loop is specifically used for: at the beginning of each cycle, control the primary side MOS to turn on, and at the same time control the constant current MOS tube or constant voltage MOS tube to turn off; The side MOS tube is turned off, and at the same time, the constant current MOS tube or the constant voltage MOS tube is controlled to be turned on.
在一些实施例中，可以基于设计好的电路结构，通过模拟测试计算原边MOS管的占空比，进而预先设定原边MOS管的导通时间。In some embodiments, based on the designed circuit structure, the duty cycle of the primary MOS transistor can be calculated through a simulation test, and then the conduction time of the primary MOS transistor can be preset.
在另一些实施例中，还可以通过在电路中增加反馈回路，由控制器对原边MOS管的占空比进行调整。In some other embodiments, the controller can also adjust the duty ratio of the primary side MOS transistor by adding a feedback loop in the circuit.
具体的，可以增加采样电路，对恒流回路的电流或恒压回路的电压进行采样，采样的电流值或采样的电压值与预设的基准值进行比较，以判断采样的电流值是否达到期望的恒定电流或采样的电压值是否达到期望的恒定电压值；在采样的电流值未达到期望的恒定电流或采样的电压值未达到期望的恒定电压时，可以将比较结果反馈到控制器，由控制器根据比较结果调整原边MOS管的占空比，也即调整原边MOS管的导通时间，以对恒流回路的电流进行调整或对恒压回路的电压进行调整，直至采样的电流值达到期望的恒定电流或采样的电压值达到期望的恒定电压值。之后，电路进入稳定状态，将持续稳定输出恒定电流和/或恒定电压。Specifically, a sampling circuit can be added to sample the current of the constant current loop or the voltage of the constant voltage loop, and compare the sampled current value or sampled voltage value with a preset reference value to determine whether the sampled current value meets the expectation Whether the constant current or the sampled voltage value reaches the desired constant voltage value; when the sampled current value does not reach the desired constant current or the sampled voltage value does not reach the desired constant voltage, the comparison result can be fed back to the controller, by The controller adjusts the duty cycle of the primary MOS tube according to the comparison result, that is, adjusts the conduction time of the primary MOS tube to adjust the current of the constant current circuit or the voltage of the constant voltage circuit until the sampled current value reaches the desired constant current or the sampled voltage value reaches the desired constant voltage value. Afterwards, the circuit enters a steady state and will continue to output constant current and/or constant voltage steadily.
在一些实施例中，采样电路可以通过在恒流回路或恒压回路中加设采样元件实现。具体的，上述的恒流回路中还可以包括：第一采样元件，用于对恒流回路的电流进行采样；恒压回路中还可以包括：第二采样元件，用于对恒压回路的电压进行采样。相对应的，控制器具体用于根据采样的电流或采样的电压判断原边MOS导通时间是否结束。In some embodiments, the sampling circuit can be realized by adding a sampling element in a constant current loop or a constant voltage loop. Specifically, the above constant current loop may also include: a first sampling element for sampling the current of the constant current loop; the constant voltage loop may also include: a second sampling element for sampling the voltage of the constant voltage loop Take a sample. Correspondingly, the controller is specifically configured to judge whether the conduction time of the primary side MOS is over according to the sampled current or the sampled voltage.
其中，第一采样元件、第二采样元件具体可以为电阻。将采样电阻串联在恒流回路中，通过采样电阻两端电压，结合电阻阻值即可计算得到采样电流值；将采样电阻并联在恒压回路中，直接采样电阻两端电压即可得到采样电压值。Wherein, the first sampling element and the second sampling element may specifically be resistors. Connect the sampling resistor in series in the constant current loop, and the sampling current value can be calculated by combining the voltage across the sampling resistor with the resistance value; connect the sampling resistor in parallel in the constant voltage loop, and directly sample the voltage across the resistor to obtain the sampling voltage value.
在一个具体的实施例中，原边MOS管按固定频率导通。每个周期中，电路的工作过程如下：In a specific embodiment, the primary side MOS transistor is turned on at a fixed frequency. In each cycle, the working process of the circuit is as follows:
周期开始，控制电路控制原边MOS管导通，此时恒流MOS管关断，恒压MOS管关断，恒流回路和恒压回路均断开，原边绕组储能；At the beginning of the cycle, the control circuit controls the primary side MOS tube to be turned on. At this time, the constant current MOS tube is turned off, the constant voltage MOS tube is turned off, the constant current circuit and the constant voltage circuit are both disconnected, and the primary winding stores energy;
控制电路检测到原边MOS管的导通时间结束，则控制原边MOS管关断，由于电感电流不能突变，为了维持原边变压器的电流方向不变，原边绕组上下两端电压差反向，副边绕组同样出现电压反向，检测到副边绕组的电压变化后，确定原边MOS管确实关断，若在此时检测到系统的恒流需求信号，则驱动恒流MOS管导通，原边绕组储存的能量被释放，在稳定状态下，通过恒流回路输出恒定电流，同时为恒流回路中的电容储能，直至周期结束，下个周期开始。When the control circuit detects that the conduction time of the primary MOS tube is over, it controls the primary MOS tube to turn off. Since the inductor current cannot change suddenly, in order to maintain the current direction of the primary transformer, the voltage difference between the upper and lower ends of the primary winding is reversed. , the voltage of the secondary winding also reverses. After the voltage change of the secondary winding is detected, it is confirmed that the primary MOS tube is indeed turned off. If the constant current demand signal of the system is detected at this time, the constant current MOS tube is driven to be turned on. , the energy stored in the primary winding is released, and in a stable state, a constant current is output through the constant current loop, and at the same time, energy is stored for the capacitor in the constant current loop until the cycle ends and the next cycle begins.
新周期开始，控制电路控制原边MOS管导通，原边绕组极性再次转变，此时恒压MOS管仍处于关断状态，控制电路检测到副边绕组极性电压变化后，确定原边MOS管确实导通，则控制恒流MOS管关断，恒流回路和恒压回路均断开，原边绕组储能；此时恒流回路中的电容释放能量继续输出恒定电流；At the beginning of a new cycle, the control circuit controls the primary side MOS tube to turn on, and the polarity of the primary side winding changes again. At this time, the constant voltage MOS tube is still in the off state. The MOS tube is indeed turned on, then the constant current MOS tube is controlled to be turned off, the constant current circuit and the constant voltage circuit are both disconnected, and the primary winding stores energy; at this time, the capacitor in the constant current circuit releases energy and continues to output a constant current;
控制电路检测到原边MOS管的导通时间结束，则控制原边MOS管关断，检测到副边绕组的电压变化后，确定原边MOS管确实关断，若在此时检测到系统的恒压需求信号，则驱动恒压MOS管导通，原边绕组储存的能量被释放，在稳定状态下，通过恒压回路输出恒定电压，同时为恒压回路中的电容储能，直至周期结束，下个周期开始。The control circuit detects that the conduction time of the primary side MOS tube is over, and then controls the primary side MOS tube to turn off. After detecting the voltage change of the secondary side winding, it is determined that the primary side MOS tube is indeed turned off. The constant voltage demand signal drives the constant voltage MOS tube to conduct, and the energy stored in the primary winding is released. In a stable state, the constant voltage is output through the constant voltage circuit, and at the same time, it stores energy for the capacitor in the constant voltage circuit until the end of the cycle. , the next cycle starts.
上述实施例仅为其中一种实现方式。在实际应用中，针对某一类电子设备，其中的组件的恒压或恒流的需求应是稳定的。可以根据固定需求，在电路设计初期，将恒流需求信号与电压需求信号设定好。例如，在原边MOS管导通的一个周期中恒压回路导通，下一个周期中恒流回路导通，如此循环，即控制恒压MOS管和恒流MOS管交替导通，且周期为原边MOS导通周期的两倍。The foregoing embodiment is only one implementation manner. In practical applications, for a certain type of electronic equipment, the constant voltage or constant current requirements of the components should be stable. According to the fixed demand, the constant current demand signal and the voltage demand signal can be set in the early stage of circuit design. For example, the constant voltage loop is turned on in one cycle when the primary side MOS tube is turned on, and the constant current loop is turned on in the next cycle. In this cycle, the constant voltage MOS tube and the constant current MOS tube are controlled to be turned on alternately, and the cycle is the original twice the turn-on period of the edge MOS.
图5为本申请一实施例提供的一种电子设备的结构示意图，如图5所示，电子设备500可以包括：电源控制电路501和负载502。电源控制电路501与负载502连接，为负载502提供恒定电流和/或恒定电压。其中，电源控制电路501可以采用上述实施例中的结构。FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. As shown in FIG. 5 , the electronic device 500 may include: a
在具体的应用中，电源控制电路501可以被应用在电源适配器中，负载502则可以被集成在需要供电的设备(例如图2所述实施例中的显示设备)上，例如LED、背光组件等，共同构成电子设备500。In a specific application, the
本实施例提供的电子设备中电源控制电路的结构和具体工作过程可以参考上述实施例的描述，此处不再一一赘述。For the structure and specific working process of the power supply control circuit in the electronic device provided in this embodiment, reference may be made to the description of the above embodiments, and details will not be repeated here.
图6为本申请一实施例提供的一种电源电路控制方法的流程图，应用于如上述的电源控制电路或电子设备中，该方法具体可以包括：Fig. 6 is a flow chart of a power circuit control method provided by an embodiment of the present application, which is applied to the above-mentioned power control circuit or electronic equipment, and the method may specifically include:
S601、检测到达周期开始时刻，控制电源回路导通，同时控制恒流回路或恒压回路断开。S601 , when the detection reaches the start time of the cycle, the control power circuit is turned on, and the constant current circuit or the constant voltage circuit is controlled to be disconnected at the same time.
S602、检测到电源回路导通时间结束后，控制电源回路断开，同时控制恒流回路或恒压回路导通。S602. After detecting that the conduction time of the power circuit is over, the control power circuit is disconnected, and at the same time, the constant current circuit or the constant voltage circuit is controlled to be turned on.
在一些实施例中，上述的控制方法还可以包括：In some embodiments, the above-mentioned control method may also include:
对恒流回路的电流进行采样或对恒压回路的电压进行采样；Sampling the current of the constant current loop or sampling the voltage of the constant voltage loop;
根据采样的电流或采样的电压判断电源回路导通时间是否结束。According to the sampled current or the sampled voltage, it is judged whether the conduction time of the power loop is over.
本实施例提供的电源电路控制方法的具体实现过程可以参考上述实施例的描述，此处不再一一赘述。For the specific implementation process of the power supply circuit control method provided in this embodiment, reference may be made to the description of the above embodiments, and details will not be repeated here.
当上述的控制方法被集成在控制芯片中执行，则本申请实施例还可以包括一种计算机存储介质，计算机存储介质存储有多条指令，指令适于由处理器加载并执行上述的方法步骤。When the above-mentioned control method is integrated and executed in the control chip, the embodiment of the present application may also include a computer storage medium, where a plurality of instructions are stored in the computer storage medium, and the instructions are adapted to be loaded by a processor and execute the above-mentioned method steps.
需要注意的是，由于篇幅所限，本申请说明书没有穷举所有可选的实施方式，本领域技术人员在阅读本申请说明书后，应该能够想到，只要技术特征不互相矛盾，那么技术特征的任意组合均可以构成可选的实施方式。记载在不同实施例中的不互相矛盾的技术特征也可以任意组合，构成可选的实施方式。It should be noted that due to limited space, this specification does not exhaustively list all optional implementation modes. After reading the specification, those skilled in the art should be able to imagine that as long as the technical features do not contradict each other, any of the technical features Any combination can constitute an optional embodiment. Non-contradictory technical features recorded in different embodiments can also be combined arbitrarily to form optional implementation modes.
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.
在一个典型的配置中，计算设备包括一个或多个处理器(CPU)、输入/输出接口、网络接口和内存。In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
存储器可能包括计算机可读介质中的非永久性存储器，随机存取存储器(RAM)和/或非易失性内存等形式，如只读存储器(ROM)或闪存(flash RAM)。存储器是计算机可读介质的示例。Memory may include non-permanent storage in computer readable media, in the form of random access memory (RAM) and/or nonvolatile memory such as read only memory (ROM) or flash RAM. The memory is an example of a computer readable medium.
计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括，但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技术、只读光盘只读存储器(CD-ROM)、数字多功能光盘(DVD)或其他光学存储、磁盒式磁带，磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质，可用于存储可以被计算设备访问的信息。按照本文中的界定，计算机可读介质不包括暂存电脑可读媒体(transitory media)，如调制的数据信号和载波。Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.
还需要说明的是，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、商品或者设备不仅包括那些要素，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、商品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
以上仅为本申请的实施例而已，并不用于限制本申请。对于本领域技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原理之内所作的任何修改、等同替换、改进等，均应包含在本申请的权利要求范围之内。The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.
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