反激变换器有源钳位技术

doi:10.16180/j.cnki.issn1007-7820.2025.05.011

Abstract

Abstract:

In view of the problems in flyback converter, transformer leakage leads to the switch tube need to bear greater stress, large energy loss, failure to recover leakage energy and low efficiency of power supply, this study investigates the active clamping technology of flyback converter, analyzes the working principle and working process of active clamping circuit in flyback converter. The advantages of introducing active clamping technology in flyback converter are described. Based on flyback converter design method, the design process of ACF(Active Clamp Flyback) is reviewed, a design case of ACF is given, and a prototype is made for testing. The test results show that the prototype realizes ZVS(Zero Voltage Switching) in the working process, and the efficiency is increased by about 3% when compared with the passive clamp flyback circuit. The research results show that the introduction of active clamping technology in flyback converter can effectively improve the voltage spike and energy loss caused by transformer leakage, reduce the voltage stress of switching tube, realize ZVS, and effectively improve the efficiency and stability of power supply system.

Key words: flyback converter, high-frequency transformer, active clamp, ACF, soft switching, ZVS, passive clamp, leakage inductor

CLC Number:

TN86

SUN Kuiyi, WANG Jingmei. Research on Active Clamping Technique for Flyback Converter[J].Electronic Science and Technology, 2025, 38(5): 76-82.

Figures/Tables 10

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References 19

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工作过程	器件状态					电流状态		说明
工作过程	Q₁	Q_C	D₁	D_C	D_O	i_Lr	i_Lm	说明
1	开通	关断	截止	截止	截止	线性上升	线性上升	电源对初级电感充电
2	关断	关断	截止	截止	截止	线性下降	线性下降	L_r、L_m与C_r谐振
3	关断	关断	截止	导通	截止	线性下降	线性下降	L_r、L_m与C_C和C_r谐振
4	关断	关断	截止	导通	导通	谐振下降	线性下降	L_m中能量传递至次级
5	关断	开通	截止	截止	导通	谐振下降至零点后反向上升	线性下降	谐振电流通过Q_C流过
6	关断	关断	截止	截止	导通	谐振下降	线性下降	L_r 和C_r 谐振
7	关断	关断	导通	截止	导通	线性下降	线性下降	C_r电压谐振到0 V

参数名称	符号	设计值
输入电压	V_in	36 ~ 60 V
输出电压	V_O	5 V
输出功率	P_O	30 W
开关频率	f_SW	400 kHz
效率	η	80%

Research on Active Clamping Technique for Flyback Converter

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