CN219304696U - Capacitor discharge control circuit and equipment - Google Patents
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- 239000003990 capacitor Substances 0.000 title claims abstract description 66
- 238000002955 isolation Methods 0.000 claims abstract description 37
- 238000004146 energy storage Methods 0.000 claims description 54
- 238000004804 winding Methods 0.000 claims description 31
- 238000007599 discharging Methods 0.000 claims description 5
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Abstract
本申请涉及一种电容放电控制电路及设备。该电路包括开关电源控制回路、放电回路、晶体管和辅助回路,其中,开关电源控制回路用于连接市电,放电回路的一端用于通过隔离变压器连接开关电源控制回路,放电回路的另一端用于放电,晶体管的第二极连接放电回路的另一端,晶体管的第三极用于接地,辅助回路的一端用于通过隔离变压器连接开关电源控制回路,辅助回路的另一端连接晶体管的第一极;辅助回路用于在开关电源控制回路处于非工作状态的情况下,控制晶体管导通,以使放电回路放电;从而,本申请通过设置晶体管和辅助回路,使得放电回路能够快速放电,电路结构简单且成本较低。
The present application relates to a capacitor discharge control circuit and equipment. The circuit includes a switching power supply control circuit, a discharge circuit, a transistor and an auxiliary circuit, wherein the switching power supply control circuit is used to connect to the mains, one end of the discharge circuit is used to connect the switching power supply control circuit through an isolation transformer, and the other end of the discharge circuit is used for Discharge, the second pole of the transistor is connected to the other end of the discharge circuit, the third pole of the transistor is used for grounding, one end of the auxiliary circuit is used to connect the switching power supply control circuit through the isolation transformer, and the other end of the auxiliary circuit is connected to the first pole of the transistor; The auxiliary circuit is used to control the conduction of the transistor to discharge the discharge circuit when the control circuit of the switching power supply is in a non-working state; thus, the application enables the discharge circuit to discharge quickly by setting the transistor and the auxiliary circuit, and the circuit structure is simple and The cost is lower.
Description
技术领域technical field
本申请涉及电容放电技术领域,特别是涉及一种电容放电控制电路及设备。The present application relates to the technical field of capacitor discharge, in particular to a capacitor discharge control circuit and equipment.
背景技术Background technique
随着开关电源在照明领域和其他领域被广泛使用,开关电源具有效率高、寿命长、体积小等居多优点;开关电源工作时输出端的大容量电解电容会储存大量的能量,开关电源关断时这些大电解电容储存的能量也不会被快速释放,电源输出端就会长时间维持一定的电压。As the switching power supply is widely used in the lighting field and other fields, the switching power supply has many advantages such as high efficiency, long life, and small size; when the switching power supply is working, the large-capacity electrolytic capacitor at the output end will store a large amount of energy. The energy stored in these large electrolytic capacitors will not be released quickly, and the output terminal of the power supply will maintain a certain voltage for a long time.
然而,在有些开关电源应用中,需要将此能量快速释放,现有的开关电源中一般采用电阻负载进行放电,存在电阻值太小会影响电源效率,太大则放电缓慢,达不到需要的放电效果的问题;采用其他电路控制负载放电时,存在电路结构较复杂且成本较高的问题。However, in some switching power supply applications, this energy needs to be released quickly. Existing switching power supplies generally use resistive loads for discharge. If the resistance value is too small, it will affect the efficiency of the power supply. If the resistance value is too large, the discharge will be slow, which cannot meet the needs The problem of discharge effect; when other circuits are used to control the load discharge, there are problems of complicated circuit structure and high cost.
实用新型内容Utility model content
基于此,有必要针对上述技术问题,提供一种能够达到需要的放电效果、电路结构简单且成本较低的电容放电控制电路及设备。Based on this, it is necessary to address the above-mentioned technical problems and provide a capacitive discharge control circuit and device that can achieve the desired discharge effect, has a simple circuit structure, and is low in cost.
第一方面,本申请提供了一种电容放电控制电路。电容放电控制电路包括:In a first aspect, the present application provides a capacitor discharge control circuit. The capacitor discharge control circuit includes:
开关电源控制回路,开关电源控制回路用于连接市电;Switching power supply control circuit, the switching power supply control circuit is used to connect to the mains;
放电回路,放电回路的一端用于通过隔离变压器连接开关电源控制回路,放电回路的另一端用于放电;Discharge circuit, one end of the discharge circuit is used to connect the switching power supply control circuit through the isolation transformer, and the other end of the discharge circuit is used for discharge;
晶体管,晶体管的第二极连接放电回路的另一端,晶体管的第三极用于接地;A transistor, the second pole of the transistor is connected to the other end of the discharge circuit, and the third pole of the transistor is used for grounding;
辅助回路,辅助回路的一端用于通过隔离变压器连接开关电源控制回路,辅助回路的另一端连接晶体管的第一极;辅助回路用于在开关电源控制回路处于非工作状态的情况下,控制晶体管导通,以使放电回路放电。Auxiliary circuit, one end of the auxiliary circuit is used to connect the switching power supply control circuit through the isolation transformer, and the other end of the auxiliary circuit is connected to the first pole of the transistor; the auxiliary circuit is used to control the conduction of the transistor when the switching power supply control circuit is in a non-working state to discharge the discharge circuit.
在其中一个实施例中,放电回路包括第一二极管和第一储能单元;In one of the embodiments, the discharge circuit includes a first diode and a first energy storage unit;
第一二极管的负极连接隔离变压器的二次侧绕组,第一二极管的正极连接第一储能单元的一端;第一储能单元的一端用于放电,第一储能单元的另一端连接隔离变压器的二次侧绕组,第一储能单元的另一端还用于接地。The cathode of the first diode is connected to the secondary side winding of the isolation transformer, and the anode of the first diode is connected to one end of the first energy storage unit; one end of the first energy storage unit is used for discharging, and the other end of the first energy storage unit One end is connected to the secondary side winding of the isolation transformer, and the other end of the first energy storage unit is also used for grounding.
在其中一个实施例中,辅助回路包括第二二极管、第二储能单元和电阻元件;In one of the embodiments, the auxiliary circuit includes a second diode, a second energy storage unit and a resistance element;
第二二极管的负极连接隔离变压器的二次侧绕组,第二二极管的正极连接第二储能单元的一端;第二储能单元的一端连接电阻元件的一端,第二储能单元的另一端分别连接隔离变压器的二次侧绕组、电阻元件的另一端,第二储能单元的另一端还用于接地;电阻元件的另一端连接晶体管的第一极。The cathode of the second diode is connected to the secondary side winding of the isolation transformer, and the anode of the second diode is connected to one end of the second energy storage unit; one end of the second energy storage unit is connected to one end of the resistance element, and the second energy storage unit The other end of the second energy storage unit is also used for grounding; the other end of the resistance element is connected to the first pole of the transistor.
在其中一个实施例中,电阻元件包括第一电阻和第二电阻;In one of the embodiments, the resistive element includes a first resistor and a second resistor;
第一电阻的一端分别连接第二储能单元的一端和第二电阻的一端,第一电阻的另一端连接第二电阻的另一端,第二电阻的另一端连接晶体管的第一极。One end of the first resistor is respectively connected to one end of the second energy storage unit and one end of the second resistor, the other end of the first resistor is connected to the other end of the second resistor, and the other end of the second resistor is connected to the first pole of the transistor.
在其中一个实施例中,第一储能单元包括第一电容器,第二储能单元包括第二电容器;In one of the embodiments, the first energy storage unit includes a first capacitor, and the second energy storage unit includes a second capacitor;
第一电容器的容值大于第二电容器的容值。The capacitance of the first capacitor is greater than the capacitance of the second capacitor.
在其中一个实施例中,电路还包括第三电阻;In one of the embodiments, the circuit further includes a third resistor;
第三电阻的一端连接晶体管的第二极,第三电阻的另一端连接放电回路的另一端。One end of the third resistor is connected to the second pole of the transistor, and the other end of the third resistor is connected to the other end of the discharge circuit.
在其中一个实施例中,开关电源控制回路的一端用于连接市电,开关电源控制回路的另一端连接隔离变压器的一次侧绕组。In one embodiment, one end of the switching power supply control loop is used to connect to the mains, and the other end of the switching power supply control loop is connected to the primary side winding of the isolation transformer.
在其中一个实施例中,电路还包括开关元件;In one of the embodiments, the circuit further includes a switching element;
开关元件的一端用于连接市电,开关元件的另一端连接开关电源控制回路。One end of the switching element is used to connect to the mains, and the other end of the switching element is connected to the switching power supply control circuit.
在其中一个实施例中,晶体管为三极管或MOS管。In one embodiment, the transistor is a triode or a MOS transistor.
第二方面,本申请还提供了一种电容放电控制设备。设备包括上述的电容放电控制电路。In a second aspect, the present application also provides a capacitor discharge control device. The device includes the above-mentioned capacitive discharge control circuit.
上述电容放电控制电路及设备,该电路包括开关电源控制回路、放电回路、晶体管和辅助回路,其中,开关电源控制回路用于连接市电,放电回路的一端用于通过隔离变压器连接开关电源控制回路,放电回路的另一端用于放电,晶体管的第二极连接放电回路的另一端,晶体管的第三极用于接地,辅助回路的一端用于通过隔离变压器连接开关电源控制回路,辅助回路的另一端连接晶体管的第一极;辅助回路用于在开关电源控制回路处于非工作状态的情况下,控制晶体管导通,以使放电回路放电;从而,本申请通过设置晶体管和辅助回路,使得放电回路能够快速放电,电路结构简单且成本较低。The above capacitor discharge control circuit and equipment, the circuit includes a switching power supply control circuit, a discharge circuit, a transistor and an auxiliary circuit, wherein the switching power supply control circuit is used to connect to the mains, and one end of the discharge circuit is used to connect to the switching power supply control circuit through an isolation transformer , the other end of the discharge circuit is used for discharging, the second pole of the transistor is connected to the other end of the discharge circuit, the third pole of the transistor is used for grounding, one end of the auxiliary circuit is used to connect the switching power supply control circuit through the isolation transformer, and the other end of the auxiliary circuit One end is connected to the first pole of the transistor; the auxiliary circuit is used to control the conduction of the transistor to discharge the discharge circuit when the switching power supply control circuit is in a non-working state; thus, the application makes the discharge circuit discharge by setting the transistor and the auxiliary circuit Capable of rapid discharge, simple circuit structure and low cost.
附图说明Description of drawings
为了更清楚地说明本申请实施例或传统技术中的技术方案,下面将对实施例或传统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 conventional technology, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the traditional technology. Obviously, the accompanying drawings in the following description are only the present invention For some embodiments of the application, those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为一个实施例中电容放电控制电路的结构框图;Fig. 1 is the structural block diagram of the capacitor discharge control circuit in an embodiment;
图2为一个实施例中放电回路的电路结构图;Fig. 2 is the circuit structural diagram of discharge circuit in an embodiment;
图3为一个实施例中辅助回路的电路结构图;Fig. 3 is the circuit structure diagram of auxiliary circuit in an embodiment;
图4为一个实施例中电容放电控制电路的电路结构图;Fig. 4 is a circuit structure diagram of a capacitor discharge control circuit in an embodiment;
图5为另一个实施例中电容放电控制电路的电路结构图。FIG. 5 is a circuit structure diagram of a capacitor discharge control circuit in another embodiment.
具体实施方式Detailed ways
为了便于理解本申请,下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的实施例。但是,本申请可以以许多不同的形式来实现,并不限于本文所描述的实施例。相反地,提供这些实施例的目的是使本申请的公开内容更加透彻全面。In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
除非另有定义,本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的,不是旨在于限制本申请。Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.
可以理解,本申请所使用的术语“第一”、“第二”等可在本文中用于描述各种元件,但这些元件不受这些术语限制。这些术语仅用于将第一个元件与另一个元件区分。举例来说,在不脱离本申请的范围的情况下,可以将第一电阻称为第二电阻,且类似地,可将第二电阻称为第一电阻。第一电阻和第二电阻两者都是电阻,但其不是同一电阻。It can be understood that the terms "first", "second" and the like used in this application may be used to describe various elements herein, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance could be termed a second resistance, and, similarly, a second resistance could be termed a first resistance, without departing from the scope of the present application. Both the first resistance and the second resistance are resistances, but they are not the same resistance.
可以理解,以下实施例中的“连接”,如果被连接的电路、模块、单元等相互之间具有电信号或数据的传递,则应理解为“电连接”、“通信连接”等。It can be understood that "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have the transmission of electrical signals or data between each other.
在此使用时,单数形式的“一”、“一个”和“所述/该”也可以包括复数形式,除非上下文清楚指出另外的方式。还应当理解的是,术语“包括/包含”或“具有”等指定所陈述的特征、整体、步骤、操作、组件、部分或它们的组合的存在,但是不排除存在或添加一个或更多个其他特征、整体、步骤、操作、组件、部分或它们的组合的可能性。When used herein, the singular forms "a", "an" and "the/the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising/comprising" or "having" etc. specify the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not exclude the presence or addition of one or more The possibility of other features, integers, steps, operations, components, parts or combinations thereof.
目前,在有些开关电源应用中,需要将此能量快速释放,比如应用于LED(LightEmitting Diode,发光二极管)照明的开关电源就需要在关断时快速释放输出大电解电容储存的能量,快速降低接LED灯的电压,以防止LED灯关断后回闪,改善此项性能指标对LED的寿命以及用户使用体验也是很有必要的。然而,现有的多种控制和改善改该项性能指标的措施也多种多样,采用其他电路控制大电解电容放电时,存在电路结构较复杂且成本较高的问题。At present, in some switching power supply applications, this energy needs to be released quickly. For example, switching power supplies used in LED (Light Emitting Diode, light-emitting diode) lighting need to quickly release the energy stored in the output large electrolytic capacitor when it is turned off, so as to quickly reduce the power consumption. The voltage of the LED lamp is used to prevent the flashback after the LED lamp is turned off. Improving this performance index is also necessary for the life of the LED and the user experience. However, there are a variety of existing measures to control and improve this performance index. When other circuits are used to control the discharge of large electrolytic capacitors, there are problems of complicated circuit structure and high cost.
本申请涉及一种电容放电控制电路及设备,电路结构简单,只需要在变压器次级增加一个辅助绕组及几个电子元件就可以实现,具有成本低,响应速度快,效果明显,性能可靠等优点。This application relates to a capacitor discharge control circuit and equipment. The circuit structure is simple, and it can be realized only by adding an auxiliary winding and several electronic components on the secondary side of the transformer. It has the advantages of low cost, fast response speed, obvious effect, and reliable performance. .
在一个实施例中,如图1所示,本申请提供了一种电容放电控制电路,该电容放电控制电路包括:In one embodiment, as shown in FIG. 1 , the present application provides a capacitor discharge control circuit, which includes:
开关电源控制回路110,开关电源控制回路110用于连接市电;Switching power
放电回路120,放电回路120的一端用于通过隔离变压器连接开关电源控制回路110,放电回路120的另一端用于放电;A
晶体管130,晶体管130的第二极连接放电回路120的另一端,晶体管130的第三极用于接地;A
辅助回路140,辅助回路140的一端用于通过隔离变压器连接开关电源控制回路110,辅助回路140的另一端连接晶体管130的第一极;辅助回路140用于在开关电源控制回路110处于非工作状态的情况下,控制晶体管130导通,以使放电回路放电。
具体而言,如图1所示,在开关电源控制回路110处于工作状态的情况下,放电回路120和辅助回路130均通过隔离变压器接收开关电源控制回路110输出的电压,此时辅助回路130接收到的电压值稍大于放电回路120接收到的电压值,此时晶体管130处于非导通状态;在开关电源控制回路处于非工作状态的情况下,辅助回路130输出的电压值下降,使得放电回路120输出的电压值大于辅助回路130输出的电压值,此时晶体管130处于导通状态,以使放电回路120快速放电,图1中Vout+用于放电。Specifically, as shown in Figure 1, when the switching power
在一些示例中,隔离变压器可以指利用电磁感应原理来改变交流电压的装置,主要功能有电压变换、电流变换、阻抗变换、隔离、稳压(磁饱和变压器)等。隔离变压器包括铁芯(或磁芯)和线圈,线圈有两个或两个以上的绕组,其中与交流电源相连的绕组叫一次侧绕组,其余的绕组叫二次侧绕组。当隔离变压器的一次侧绕组接在交流电源上时,铁心中便产生交变磁通,交变磁通在二次侧绕组上感应产生交变电流。In some examples, an isolation transformer can refer to a device that uses the principle of electromagnetic induction to change AC voltage, and its main functions include voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. The isolation transformer includes an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the AC power supply is called the primary side winding, and the remaining windings are called the secondary side winding. When the primary side winding of the isolation transformer is connected to the AC power supply, an alternating magnetic flux is generated in the iron core, and the alternating magnetic flux induces an alternating current on the secondary side winding.
在其中一个实施例中,如图2所示,放电回路可以包括第一二极管(D1)和第一储能单元(C1);In one of the embodiments, as shown in FIG. 2, the discharge circuit may include a first diode (D1) and a first energy storage unit (C1);
第一二极管(D1)的负极连接隔离变压器的二次侧绕组,第一二极管(D1)的正极连接第一储能单元(C1)的一端;第一储能单元(C1)的一端用于放电,第一储能单元(C1)的另一端连接隔离变压器的二次侧绕组,第一储能单元(C1)的另一端还用于接地。The cathode of the first diode (D1) is connected to the secondary side winding of the isolation transformer, and the anode of the first diode (D1) is connected to one end of the first energy storage unit (C1); the first energy storage unit (C1) One end is used for discharging, the other end of the first energy storage unit (C1) is connected to the secondary side winding of the isolation transformer, and the other end of the first energy storage unit (C1) is also used for grounding.
具体地,在开关电源控制回路处于工作状态的情况下,第一二极管(D1)接收隔离变压器的二次侧绕组传输的电压并对其进行整流,整流后的电压可用于给第一储能单元(C1)充电;在开关电源控制回路处于非工作状态的情况下,晶体管导通后,第一储能单元可以快速放电,图1中Vout+用于放电。Specifically, when the switching power supply control loop is in the working state, the first diode (D1) receives the voltage transmitted by the secondary side winding of the isolation transformer and rectifies it, and the rectified voltage can be used for the first storage The energy storage unit (C1) is charged; when the switching power supply control circuit is in a non-working state, after the transistor is turned on, the first energy storage unit can be quickly discharged, and Vout+ in Figure 1 is used for discharge.
进一步地,第一储能单元(C1)可以指能够对电能进行出存储的元件,例如,电池、电感器,在本申请实施例中以电感器为例进行说明。Further, the first energy storage unit ( C1 ) may refer to an element capable of storing electric energy, for example, a battery or an inductor, and an inductor is used as an example for illustration in this embodiment of the present application.
在其中一个实施例中,如图3所示,辅助回路可以包括第二二极管(D2)、第二储能单元(C2)和电阻元件;In one of the embodiments, as shown in FIG. 3, the auxiliary circuit may include a second diode (D2), a second energy storage unit (C2) and a resistance element;
第二二极管(D1)的负极连接隔离变压器的二次侧绕组,第二二极管(D1)的正极连接第二储能单元(C2)的一端;第二储能单元(C2)的一端连接电阻元件的一端,第二储能单元(C2)的另一端分别连接隔离变压器的二次侧绕组、电阻元件的另一端,第二储能单元(C2)的另一端还用于接地;电阻元件的另一端连接晶体管的第一极。The negative pole of the second diode (D1) is connected to the secondary side winding of the isolation transformer, and the positive pole of the second diode (D1) is connected to one end of the second energy storage unit (C2); the second energy storage unit (C2) One end is connected to one end of the resistance element, the other end of the second energy storage unit (C2) is respectively connected to the secondary side winding of the isolation transformer and the other end of the resistance element, and the other end of the second energy storage unit (C2) is also used for grounding; The other end of the resistance element is connected to the first pole of the transistor.
具体地,在开关电源控制回路处于工作状态的情况下,第二二极管(D2)接收隔离变压器的二次侧绕组传输的电压并对其进行整流,整流后的电压可用于给第二储能单元(C2)充电;在开关电源控制回路处于非工作状态的情况下,第二储能单元(C2)输出的电压通过电阻元件快速放电,使得第二储能单元(C2)输出的电压值快速下降,此电压经过电阻元件流向晶体管,此时第一储能单元(C1)输出的电压值大于第二储能单元(C2)输出的电压值,晶体管处于导通状态,以使第一储能单元(C1)快速放电。Specifically, when the switching power supply control loop is in the working state, the second diode (D2) receives the voltage transmitted by the secondary side winding of the isolation transformer and rectifies it, and the rectified voltage can be used for the second storage The energy unit (C2) is charged; when the switching power supply control circuit is in a non-working state, the voltage output by the second energy storage unit (C2) is quickly discharged through the resistance element, so that the voltage value output by the second energy storage unit (C2) The voltage drops rapidly, and the voltage flows to the transistor through the resistance element. At this time, the output voltage value of the first energy storage unit (C1) is greater than the output voltage value of the second energy storage unit (C2), and the transistor is in the conduction state, so that the first energy storage unit (C1) The energy cell (C1) is discharged rapidly.
在其中一个实施例中,如图3所示,电阻元件可以包括第一电阻(R1)和第二电阻(R2);In one of the embodiments, as shown in FIG. 3, the resistance element may include a first resistor (R1) and a second resistor (R2);
第一电阻(R1)的一端分别连接第二储能单元(C2)的一端和第二电阻(R2)的一端,第一电阻(R1)的另一端连接第二电阻(R2)的另一端,第二电阻(R2)的另一端连接晶体管的第一极。One end of the first resistor (R1) is respectively connected to one end of the second energy storage unit (C2) and one end of the second resistor (R2), and the other end of the first resistor (R1) is connected to the other end of the second resistor (R2), The other end of the second resistor ( R2 ) is connected to the first pole of the transistor.
具体而言,如图3所示,在开关电源控制回路处于非工作状态的情况下,第二储能单元(C2)输出的电压通过第一电阻(R1)快速放电,使得第二储能单元(C2)输出的电压值快速下降,此电压经过第二电阻(R2)流向晶体管,此时第一储能单元(C1)输出的电压值大于第二储能单元(C2)输出的电压值,晶体管处于导通状态,以使第一储能单元(C1)快速放电。Specifically, as shown in Figure 3, when the switching power supply control circuit is in a non-working state, the voltage output by the second energy storage unit (C2) is quickly discharged through the first resistor (R1), so that the second energy storage unit The voltage value output by (C2) drops rapidly, and this voltage flows to the transistor through the second resistor (R2), at this time, the voltage value output by the first energy storage unit (C1) is greater than the voltage value output by the second energy storage unit (C2), The transistor is turned on to quickly discharge the first energy storage unit (C1).
在其中一个实施例中,第一储能单元包括第一电容器,第二储能单元包括第二电容器;In one of the embodiments, the first energy storage unit includes a first capacitor, and the second energy storage unit includes a second capacitor;
第一电容器的容值大于第二电容器的容值。The capacitance of the first capacitor is greater than the capacitance of the second capacitor.
具体地,图2中所示的第一储能单元(C1)为第一电容器,图3中所示的第二储能单元(C2)为第二电容器,且第一电容器的容值大于第二电容器的容值;故在开关电源控制回路处于非工作状态的情况下,开关电源控制回路停止对第一电容器和第二电容器充电,由于第一电容器是大容量的电容,储存的能量较大且放电回路的阻抗比较大,不能快速放电;第二电容器是小容量电容,储存的能量很小,通过第一电阻快速放电使第二电容器输出的电压快速下降,此电压通过第二电阻向晶体管第一极提供一个小于晶体管第二极的电压,晶体管导通,以使第一电容器快速放电。Specifically, the first energy storage unit (C1) shown in FIG. 2 is a first capacitor, the second energy storage unit (C2) shown in FIG. 3 is a second capacitor, and the capacitance of the first capacitor is greater than that of the first capacitor. The capacitance of the second capacitor; therefore, when the switching power supply control circuit is in a non-working state, the switching power supply control circuit stops charging the first capacitor and the second capacitor. Since the first capacitor is a large-capacity capacitor, the stored energy is relatively large And the impedance of the discharge circuit is relatively large, so it cannot be discharged quickly; the second capacitor is a small-capacity capacitor, and the stored energy is very small. Rapid discharge through the first resistor causes the output voltage of the second capacitor to drop rapidly, and this voltage is sent to the transistor through the second resistor. The first pole provides a voltage lower than that of the second pole of the transistor, and the transistor is turned on so as to quickly discharge the first capacitor.
在其中一个实施例中,如图4所示,电路还可以包括第三电阻(R3);In one of the embodiments, as shown in FIG. 4, the circuit may further include a third resistor (R3);
第三电阻(R3)的一端连接晶体管(Q1)的第二极,第三电阻(R3)的另一端连接放电回路的另一端。One end of the third resistor (R3) is connected to the second pole of the transistor (Q1), and the other end of the third resistor (R3) is connected to the other end of the discharge circuit.
具体地,如图4所示,第二电容器通过第一电阻快速放电使得V1+处电压快速下降,此电压通过第二电阻向晶体管第一极提供一个小于晶体管第二极的电压,晶体管导通,第一电容器通过第三电阻(R3)快速放电。Specifically, as shown in FIG. 4, the second capacitor is rapidly discharged through the first resistor so that the voltage at V1+ drops rapidly, and this voltage provides a voltage lower than the second electrode of the transistor to the first electrode of the transistor through the second resistor, and the transistor is turned on. The first capacitor is quickly discharged through the third resistor (R3).
在其中一个实施例中,开关电源控制回路的一端用于连接市电,开关电源控制回路的另一端连接隔离变压器的一次侧绕组。In one embodiment, one end of the switching power supply control loop is used to connect to the mains, and the other end of the switching power supply control loop is connected to the primary side winding of the isolation transformer.
具体而言,开关电源控制回路通过隔离变压器一次侧绕组向隔离变压器二次侧绕组输出电压。Specifically, the switching power supply control circuit outputs voltage to the secondary side winding of the isolation transformer through the primary side winding of the isolation transformer.
在其中一个实施例中,如图5所示,电路还包括开关元件(K1);In one of the embodiments, as shown in Figure 5, the circuit further includes a switching element (K1);
开关元件(K1)的一端用于连接市电,开关元件(K1)的另一端连接开关电源控制回路。One end of the switch element (K1) is used to connect to the mains, and the other end of the switch element (K1) is connected to the switching power supply control circuit.
具体地,如图5所示,在开关元件(K1)处于闭合状态的情况下,开关电源控制回路处于工作状态;在开关元件(K1)处于非闭合状态的情况下,开关电源控制回路处于非工作状态。Specifically, as shown in Figure 5, when the switching element (K1) is in the closed state, the switching power supply control loop is in the working state; when the switching element (K1) is in the non-closed state, the switching power supply control loop is in the non- working status.
在其中一个实施例中,晶体管为三极管或MOS管。In one embodiment, the transistor is a triode or a MOS transistor.
具体地,本申请中以三极管为例进行说明,其中,晶体管的第一极可以指三极管的基极,晶体管的第二极可以指三极管的发射极,晶体管的第三极可以指三极管的集电极。Specifically, this application uses a triode as an example for illustration, wherein the first pole of the transistor may refer to the base of the triode, the second pole of the transistor may refer to the emitter of the triode, and the third pole of the transistor may refer to the collector of the triode .
在一个实施例中,本申请还提供了一种电容放电控制设备。设备包括上述的电容放电控制电路。In an embodiment, the present application also provides a capacitor discharge control device. The device includes the above-mentioned capacitive discharge control circuit.
具体而言,如图5所示,该电容放电控制设备包括上述的电容放电控制电路,在开关元件处于闭合状态的情况下,开关电源控制回路进入工作状态,驱动隔离变压器的一次侧绕组进入工作状态,同时隔离变压器的二次侧绕组也开始输出电压,通过第一二极管整流后对第一电容器(大电容容量)充电输出电压(Vout+),通过第二二极管整流后对第二电容器(小电容容量)充电输出电压(V1+);合理设计隔离变压器的二次侧绕组,使整流后的V1+电压稍大于Vout+电压,这样在开关电源控制回路进入工作状态时,V1+电压通过第二电阻向三极管(三极管也可以选用P型MOS管)的基极提供一个大于三极管发射极的电压使三极管截止,第三电阻不导通。Specifically, as shown in Figure 5, the capacitor discharge control device includes the above-mentioned capacitor discharge control circuit. When the switching element is in the closed state, the switching power supply control circuit enters the working state, and drives the primary side winding of the isolation transformer to enter the working state. At the same time, the secondary side winding of the isolation transformer also starts to output voltage, and after being rectified by the first diode, the output voltage (Vout+) will be charged to the first capacitor (large capacitance), and the output voltage (Vout+) will be charged to the second capacitor after being rectified by the second diode. Capacitor (small capacitance) charging output voltage (V1+); rationally design the secondary side winding of the isolation transformer so that the rectified V1+ voltage is slightly greater than the Vout+ voltage, so that when the switching power supply control circuit enters the working state, the V1+ voltage passes through the second The resistor provides a voltage greater than the emitter of the triode to the base of the triode (the triode can also be selected as a P-type MOS tube), so that the triode is cut off, and the third resistor is not turned on.
在开关元件处于非闭合状态的情况下,开关电源控制回路处于非工作状态,驱动隔离变压器的一次侧绕组进入非工作状态,同时隔离变压器的二次侧绕组也停止对第一电容器和第二电容器充电,由于第一电容器是大容量的电容,储存的能量较大且放电回路的阻抗比较大,不能快速放电;第二电容器是小容量电容,储存的能量很小,通过第一电阻快速放电使V1+电压快速下降,此电压通过第二电阻向三极管(三极管也可以选用P型MOS管)基极提供一个小于三极管发射极的电压使三极管导通,第三电阻导通对第一电容器进行快速放电;When the switching element is in the non-closed state, the switching power supply control circuit is in the non-working state, driving the primary side winding of the isolation transformer to enter the non-working state, and at the same time, the secondary side winding of the isolation transformer also stops the first capacitor and the second capacitor. Charging, because the first capacitor is a large-capacity capacitor, the stored energy is relatively large and the impedance of the discharge circuit is relatively large, so it cannot be discharged quickly; the second capacitor is a small-capacity capacitor, the stored energy is very small, and the rapid discharge through the first resistor makes it The voltage of V1+ drops rapidly, and this voltage provides a voltage lower than the emitter of the triode to the base of the triode (the triode can also be a P-type MOS tube) through the second resistor to make the triode conduct, and the third resistor conducts to quickly discharge the first capacitor ;
通过合理选择第一电阻、第二电阻和第三电阻的阻值以及晶体管的参数就可以达到快速对开关电源的大容量输出电容进行放电的效果。By reasonably selecting the resistance values of the first resistor, the second resistor and the third resistor and the parameters of the transistor, the effect of quickly discharging the large-capacity output capacitor of the switching power supply can be achieved.
在本说明书的描述中,参考术语“有些实施例”、“其他实施例”、“理想实施例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特征包含于本实用新型的至少一个实施例或示例中。在本说明书中,对上述术语的示意性描述不一定指的是相同的实施例或示例。In the description of this specification, descriptions referring to the terms "some embodiments", "other embodiments", "ideal embodiments" and the like mean that specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in this specification. In at least one embodiment or example of the utility model. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
以上实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.
以上所述实施例仅表达了本申请的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本申请专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本申请构思的前提下,还可以做出若干变形和改进,这些都属于本申请的保护范围。因此,本申请的保护范围应以所附权利要求为准。The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be determined by the appended claims.
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