一种高增益零输入电流纹波Sepic变换器

doi:10.11985/2023.04.022

摘要/Abstract

摘要：

针对传统变换器电压增益低，开关处于硬状态工作，输入纹波大等缺点，提出一种高增益零输入电流纹波拓扑结构。将无源纹波单元接入到传统Sepic变换器的输入端，通过耦合电感与电感电容串联组合，保留输入电流连续的特点，同时实现输入电流零纹波效果，且零纹波实现与占空比大小无关，从而延长光伏组件中电池使用寿命，电路可靠性高。通过倍压单元结构和无源钳位吸收电路组合，开关管电压应力降低，便于采用低耐压开关器件，损耗降低。在零输入电流纹波变换器等效模型的基础上，分析变换器的工作原理，对比不同变换器的工作性能。最后搭建一台100 W的试验样机，验证了理论分析的正确性和电路的可行性。

关键词: 零纹波, 高增益变换器, 耦合电感, 低电压应力

Abstract:

In view of the low voltage gain, hard state switch operation and large input ripple, a high-gain zero-input current ripple topology is proposed. The passive ripple unit is connected to the input end of the traditional Sepic converter, by coupling inductance and inductor capacitor series combination, retain the characteristics of continuous input current, while realizing the input current zero ripple effect, and zero ripple realization is independent of the duty cycle, so as to extend the service life of cells in photovoltaic modules, circuit reliability is high. Through the combination of double voltage unit structure and passive clamp absorption circuit, the voltage stress of the switch tube is reduced, which is convenient to use low voltage resistant switching devices, and the loss is reduced. On the basis of the equivalent model of the zero-input current ripple converter, the working principle of the converter is analyzed, and the working performance of the different converters are compared. Finally, a 100 W test prototype is built to verify the correctness of the theoretical analysis and the feasibility of the circuit.

Key words: Zero ripple, high-gain converter, coupled inductance, low voltage stress

中图分类号:

TM46

郭瑞, 郭佳, 王国翰. 一种高增益零输入电流纹波Sepic变换器[J]. 电气工程学报, 2023, 18(4): 199-208.

GUO Rui, GUO Jia, WANG Guohan. A High-gain Zero-input Current Ripple Sepic Converter[J]. Journal of Electrical Engineering, 2023, 18(4): 199-208.

图/表 18

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表1

变换器之间的性能对比"

性能	Sepic变换器	文献[6]所提变换器	文献[10]所提变换器	本文所提变换器
电压增益	$D 1 − D$	$1 + 3 D 1 − D$	$1 + N D 1 − D$	$1 + N + D 1 − D$
开关电压应力	$V 0 D$	$V 0 1 + 3 D$	$V 0 1 + N D$	$V 0 1 + N + D$
二极管反向恢复问题	大	大	小	小
开关开通状态	硬开关	硬开关	软开关	ZCS
输入电流电流纹波	大	小	小	零

表1

图9

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表2

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图16

参考文献 21

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参数	数值/型号	参数	数值/型号
输入电压V_in/V	12	耦合电感匝比N	N_s/N_p=2
输出功率P_o/W	100	漏感L_K1/μH	1.8
开关频率f_s/kHz	50	漏感L_K2/μH	1.65
输入电感L₁/μH	120	电容C₁、C₂/μF	100
输入电感L₂/μH	120	电容C₃、C₀/μF	220
励磁电感L_m1/μH	123	电容C₄、C₅/μF	100
励磁电感L_m2/μH	87	二极管	FHP20100
耦合电感匝比N	N_s/N_p=1	开关管	IRF540N