CN201854187U - A Voltage Stabilizing Loop for Isolated Flyback Switching Power Supply - Google Patents
A Voltage Stabilizing Loop for Isolated Flyback Switching Power Supply Download PDFInfo
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Abstract
本实用新型涉及一种隔离反激开关电源的稳压环路，包括输入整流滤波电路(11)、高频变压器TR、反激式开关电源PWM芯片IC1、稳压电路和输出整流滤波电路；其特征是：所述稳压电路由稳压器、限流器和光电耦合器组成，由稳压器、限流器连接成稳压限流通路跨接在整流滤波电路的正电压输出端与光电耦合器的正输入端，光电耦合器的负输入端接地，光电耦合器的输出端连接反激式开关电源PWM芯片IC1的反馈信号输入端。由于本实用新型省去了一个三端稳压器及取样电阻组件，从而简化了稳压环路电路结构，因此具有简化电路结构及降低成本的有益效果。主要应用在隔离反激式开关电源电路中，如家电类开关电源产品中。
The utility model relates to a voltage stabilizing loop circuit for isolating a flyback switching power supply, comprising an input rectification and filtering circuit (11), a high frequency transformer TR, a flyback switching power supply PWM chip IC1, a voltage stabilizing circuit and an output rectification and filtering circuit; The feature is: the voltage stabilizing circuit is composed of a voltage stabilizer, a current limiter and a photocoupler, and the voltage stabilizer and the current limiter are connected to form a voltage stabilizing and current limiting path connected across the positive voltage output terminal of the rectification filter circuit and the photoelectric coupler. The positive input terminal of the coupler, the negative input terminal of the photocoupler are grounded, and the output terminal of the photocoupler is connected to the feedback signal input terminal of the flyback switching power supply PWM chip IC1. Because the utility model omits a three-terminal voltage stabilizer and a sampling resistance assembly, thereby simplifying the voltage stabilizing loop circuit structure, it has the beneficial effects of simplifying the circuit structure and reducing costs. It is mainly used in isolated flyback switching power supply circuits, such as household appliances switching power supply products.
Description
技术领域technical field
本实用新型涉及一种稳压环路，特别是涉及一种隔离反激开关电源的稳压环路。属于开关电源技术领域。The utility model relates to a voltage stabilizing loop, in particular to a voltage stabilizing loop for isolating a flyback switching power supply. It belongs to the technical field of switching power supplies.
背景技术Background technique
目前，开关电源得到广泛的应用。隔离反激开关电源的稳压环路直接控制输出电压的稳定，关系到开关电源安全，具有高稳定性的稳压环路，可有效防止输出电压过高或过低，从而保障人们的人身安全。Currently, switching power supplies are widely used. The voltage stabilization loop of the isolated flyback switching power supply directly controls the stability of the output voltage, which is related to the safety of the switching power supply. The high stability voltage stabilization loop can effectively prevent the output voltage from being too high or too low, thereby ensuring people's personal safety .
现有开关电源典型电路一般选用三端稳压器TL431来稳定输出电压。此典型电路包括：输出整流滤波电路、输出电压取样电路、内部三端稳压器基准源、三端稳压器外部反馈网络、光耦器件组成。如图2所示，R3、C2组成三端稳压器外部反馈网络；R4、R5输出电压取样电路；D2、C3输出整流滤波电路。当输出电压上升时，R4、R5中点电压上升，此时IC3内部调整3脚电压下降使流过IC2(1、2)脚的电流增大，经IC2内部调整使PWM IC的FB脚电压下降，从而PWM IC的输出驱动占空比减小，输出电压下降，达到稳定输出的目的。当输出电压下降时，R4、R5中点电压下降，此时IC3内部调整3脚电压上升使流过IC2(1、2)脚的电流减小，经IC2内部调整使PWMIC的FB脚电压上升，从而PWM IC的输出驱动占空比增大，输出电压上升，达到稳定输出的目的。采用上述稳压环路的不足之处是：所用元器件较多，电路比较复杂，生产故障率高，元器件成本高。The typical circuit of the existing switching power supply generally uses a three-terminal voltage regulator TL431 to stabilize the output voltage. This typical circuit includes: output rectification filter circuit, output voltage sampling circuit, reference source of internal three-terminal voltage regulator, external feedback network of three-terminal voltage regulator, and optocoupler device. As shown in Figure 2, R3 and C2 form the external feedback network of the three-terminal regulator; R4 and R5 output voltage sampling circuit; D2 and C3 output rectification and filtering circuit. When the output voltage rises, the midpoint voltage of R4 and R5 rises, and IC3 internally adjusts the voltage of pin 3 to drop to increase the current flowing through IC2 (1, 2) pins, and the internal adjustment of IC2 makes the voltage of FB pin of PWM IC drop , so that the output drive duty cycle of the PWM IC decreases, the output voltage drops, and the purpose of stable output is achieved. When the output voltage drops, the midpoint voltage of R4 and R5 drops, and IC3 internally adjusts the voltage of pin 3 to rise to reduce the current flowing through IC2 (1, 2) pins, and the internal adjustment of IC2 makes the voltage of FB pin of PWMIC rise. As a result, the output drive duty cycle of the PWM IC increases, and the output voltage rises to achieve stable output. The disadvantages of adopting the above voltage stabilizing loop are: more components are used, the circuit is more complicated, the production failure rate is high, and the cost of components is high.
实用新型内容Utility model content
本实用新型的目的，是为了克服现有技术中的开关电源的稳压环路存在元器件较多、电路比较复杂、故障率高、成本高的缺点，提供一种隔离反激开关电源的稳压环路，在保证开关电源的稳压环路性能不变的前提下，简化电路，降低成本。The purpose of this utility model is to overcome the disadvantages of many components, complex circuits, high failure rate and high cost in the voltage stabilizing loop of the switching power supply in the prior art, and to provide a stable circuit for an isolated flyback switching power supply. Voltage loop, on the premise of ensuring that the performance of the voltage stabilization loop of the switching power supply remains unchanged, the circuit is simplified and the cost is reduced.
本实用新型的目的可以通过如下措施达到：The purpose of this utility model can be achieved through the following measures:
一种隔离反激开关电源的稳压环路，包括输入整流滤波电路(11)、高频变压器TR、反激式开关电源PWM芯片IC1、稳压电路和输出整流滤波电路；输入整流滤波电路(11)的输出端通过高频变压器TR的初级绕组连接反激式开关电源PWM芯片IC1的电源输入端，高频变压器TR的次级绕组之二通过整流滤波电路连接反激式开关电源PWM芯片IC1的VCC电源端，输出整流滤波电路跨接在高频变压器TR次级绕组之一的两端；其特征是：所述稳压电路由稳压器、限流器和光电耦合器组成，由稳压器、限流器连接成稳压限流通路跨接在整流滤波电路的正电压输出端与光电耦合器的正输入端，光电耦合器的负输入端接地，光电耦合器的输出端连接反激式开关电源PWM芯片IC1的反馈信号输入端。A voltage stabilizing loop of an isolated flyback switching power supply, comprising an input rectification filter circuit (11), a high frequency transformer TR, a flyback switching power supply PWM chip IC1, a voltage stabilizing circuit and an output rectification filter circuit; an input rectification filter circuit ( 11) The output terminal of the high-frequency transformer TR is connected to the power supply input terminal of the flyback switching power supply PWM chip IC1 through the primary winding of the high-frequency transformer TR, and the second secondary winding of the high-frequency transformer TR is connected to the flyback switching power supply PWM chip IC1 through a rectification and filtering circuit The VCC power supply end, the output rectification and filtering circuit is connected across the two ends of one of the secondary windings of the high-frequency transformer TR; The voltage regulator and the current limiter are connected to form a voltage-stabilizing and current-limiting path across the positive voltage output terminal of the rectification filter circuit and the positive input terminal of the optocoupler, the negative input terminal of the optocoupler is grounded, and the output terminal of the optocoupler is connected to the opposite The feedback signal input terminal of the exciting switching power supply PWM chip IC1.
本实用新型的目的还可以通过如下措施达到：The purpose of this utility model can also be achieved through the following measures:
本实用新型的一种实施方式是：稳压器由稳压二极管ZD1构成，限流器限流电阻R2构成，光电耦合器由光耦二极管IC2构成；稳压二极管ZD1的正极与限流电阻R2的一端连接、负极与滤波电容C3正极连接，限流电阻R2的另一端与光耦二极管IC2的第1脚相连，光耦二极管IC2的第2脚与GND相连，光耦二极管IC2的第3脚与PWM集成电路IC1的反馈输入端FB脚相连，光耦二极管IC2的第4脚接高压地SG。An embodiment of the present utility model is: the voltage regulator is composed of a Zener diode ZD1, the current limiter is composed of a current limiting resistor R2, and the photocoupler is composed of an optocoupler diode IC2; the positive electrode of the Zener diode ZD1 is connected to the current limiting resistor R2 Connect one end of the negative pole to the positive pole of the filter capacitor C3, the other end of the current limiting resistor R2 is connected to the first pin of the optocoupler diode IC2, the second pin of the optocoupler diode IC2 is connected to GND, and the third pin of the optocoupler diode IC2 It is connected with the feedback input end FB pin of PWM integrated circuit IC1, and the 4th pin of optocoupler diode IC2 is connected with high voltage ground SG.
本实用新型的一种实施方式是：输出整流滤波电路由整流二极管D2和滤波电容C3构成，整流二极管D2和滤波电容C3串联后跨接在高频变压器TR的次级绕组之一的二端，整流二极管D2和滤波电容C3的连接处形成正电压输出端，滤波电容C3负极接地GND及形成负电压输出端。An embodiment of the present utility model is: the output rectification filter circuit is composed of a rectifier diode D2 and a filter capacitor C3, and the rectifier diode D2 and filter capacitor C3 are connected in series across the two ends of one of the secondary windings of the high-frequency transformer TR, The connection between the rectifier diode D2 and the filter capacitor C3 forms a positive voltage output terminal, and the negative electrode of the filter capacitor C3 is grounded to GND and forms a negative voltage output terminal.
本实用新型的有益效果是：The beneficial effects of the utility model are:
1、与现有技术相比，由于本实用新型省去了一个三端稳压器及取样电阻组件，从而简化了稳压环路电路结构，因此具有简化电路结构及降低成本的有益效果。1. Compared with the prior art, because the utility model saves a three-terminal voltage regulator and a sampling resistor assembly, thereby simplifying the circuit structure of the voltage stabilizing loop, it has the beneficial effects of simplifying the circuit structure and reducing costs.
2、本实用新型主要应用在隔离反激式开关电源电路中，如家电类开关电源产品中。2. The utility model is mainly used in isolated flyback switching power supply circuits, such as household appliances switching power supply products.
附图说明Description of drawings
图1是本实用新型具体实施例所述隔离反激开关电源的电路原理图。Fig. 1 is a schematic circuit diagram of an isolated flyback switching power supply according to a specific embodiment of the present invention.
图2是现有技术中的隔离反激开关电源的电路原理图。Fig. 2 is a schematic circuit diagram of an isolated flyback switching power supply in the prior art.
具体实施方式Detailed ways
以下结合附图及实施例对本实用新型作进一步的详细描述：Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
具体实施例1：Specific embodiment 1:
参照图1，本实施例包括输入整流滤波电路11、高频变压器TR、反激式开关电源PWM芯片IC1、稳压电路和输出整流滤波电路；输入整流滤波电路11的输出端通过高频变压器TR的初级绕组连接反激式开关电源PWM芯片IC1的电源输入端，高频变压器TR的次级绕组之二通过整流滤波电路连接反激式开关电源PWM芯片IC1的VCC电源端，输出整流滤波电路跨接在高频变压器TR次级绕组之一的两端；所述稳压电路由稳压器、限流器和光电耦合器组成，由稳压器、限流器连接成稳压限流通路跨接在整流滤波电路的正电压输出端与光电耦合器的正输入端，光电耦合器的负输入端接地，光电耦合器的输出端连接反激式开关电源PWM芯片IC1的反馈信号输入端。With reference to Fig. 1, present embodiment comprises input rectifying and filtering circuit 11, high-frequency transformer TR, flyback switching power supply PWM chip IC1, voltage stabilizing circuit and output rectifying and filtering circuit; The primary winding of the flyback switching power supply PWM chip IC1 is connected to the power input terminal, the second secondary winding of the high-frequency transformer TR is connected to the VCC power supply terminal of the flyback switching power supply PWM chip IC1 through the rectification and filtering circuit, and the output rectification and filtering circuit crosses connected to both ends of one of the secondary windings of the high-frequency transformer TR; Connected to the positive voltage output terminal of the rectification filter circuit and the positive input terminal of the photocoupler, the negative input terminal of the photocoupler is grounded, and the output terminal of the photocoupler is connected to the feedback signal input terminal of the flyback switching power supply PWM chip IC1.
本实施例中，稳压器由稳压二极管ZD1构成，限流器由限流电阻R2构成，光电耦合器由光耦二极管IC2构成；稳压二极管ZD1的正极与限流电阻R2的一端连接、负极与滤波电容C3正极连接，限流电阻R2的另一端与光耦二极管IC2的第1脚相连，光耦二极管IC2的第2脚与GND相连，光耦二极管IC2的第3脚与PWM集成电路IC1的反馈输入端FB脚相连，光耦二极管IC2的第4脚接高压地SG。输出整流滤波电路由整流二极管D2和滤波电容C3构成，整流二极管D2和滤波电容C3串联后跨接在高频变压器TR的次级绕组之一的二端，整流二极管D2和滤波电容C3的连接处形成正电压输出端，滤波电容C3负极接地GND及形成负电压输出端。In this embodiment, the voltage regulator is composed of a Zener diode ZD1, the current limiter is composed of a current limiting resistor R2, and the photocoupler is composed of an optocoupler diode IC2; the anode of the Zener diode ZD1 is connected to one end of the current limiting resistor R2, The negative pole is connected to the positive pole of the filter capacitor C3, the other end of the current limiting resistor R2 is connected to the first pin of the optocoupler diode IC2, the second pin of the optocoupler diode IC2 is connected to GND, the third pin of the optocoupler diode IC2 is connected to the PWM integrated circuit The feedback input terminal FB pin of IC1 is connected, and the 4th pin of optocoupler diode IC2 is connected to the high voltage ground SG. The output rectification and filter circuit is composed of rectification diode D2 and filter capacitor C3. The rectifier diode D2 and filter capacitor C3 are connected in series across the two ends of one of the secondary windings of the high-frequency transformer TR. The connection between the rectifier diode D2 and the filter capacitor C3 A positive voltage output terminal is formed, and the negative pole of the filter capacitor C3 is grounded to GND to form a negative voltage output terminal.
本实施例的工作原理：The working principle of this embodiment:
高频交流电经整流二极管D2整流、滤波电容C3滤波后，得到平滑的直流电源。当输出电压上升时，流过稳压二极管ZD1的电流增大，同时流过光电耦合器IC2内部发光二极管(1、2)脚的电流增大，光电耦合器IC2(3、4)脚压降减小，反激式开关电源PWM集成电路IC1的FB脚(反馈脚)电压下降使IC1输出占空比减小，达到稳定输出电压的目的。The high-frequency alternating current is rectified by the rectifying diode D2 and filtered by the filter capacitor C3 to obtain a smooth direct-current power supply. When the output voltage rises, the current flowing through the Zener diode ZD1 increases, and at the same time the current flowing through the pins of the light-emitting diodes (1, 2) inside the photocoupler IC2 increases, and the voltage drop of the pins of the photocoupler IC2 (3, 4) Decrease, the FB pin (feedback pin) voltage of the flyback switching power supply PWM integrated circuit IC1 drops to reduce the output duty cycle of IC1 to achieve the purpose of stabilizing the output voltage.
当输出电压下降时，流过稳压二极管ZD1的电流减小，同时流过光电耦合器IC2内部发光二极管(1、2)脚的电流减小，光电耦合器IC2(3、4)脚压降增大，反激式开关电源PWM集成电路IC1的FB脚(反馈脚)的电压增大使IC1输出占空比增大，达到稳定输出电压的目的。When the output voltage drops, the current flowing through the Zener diode ZD1 decreases, and at the same time the current flowing through the pins of the light-emitting diodes (1, 2) inside the photocoupler IC2 decreases, and the voltage drop of the pins of the photocoupler IC2 (3, 4) Increase, the voltage of the FB pin (feedback pin) of the flyback switching power supply PWM integrated circuit IC1 increases to increase the output duty cycle of IC1 to achieve the purpose of stabilizing the output voltage.
以上所述，仅为本实用新型较佳的具体实施例，但本实用新型的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本实用新型揭露的范围内，根据本实用新型的技术方案及其实用新型构思加以等同替换或改变，都属于本实用新型的保护范围。The above is only a preferred specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. Any equivalent replacement or change of the technical solution and the concept of the utility model shall belong to the protection scope of the utility model.
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