A Novel DC-DC Converter with High Step-down Ratio

doi:10.11985/2021.03.005

Abstract

Abstract:

At certain duty cycle, a novel DC-DC converter with larger step-down ratio and low voltage stress of switching devices is studied. The proposed converter consists of a low-side switch type step-down unit cascading with switched inductor step-down unit. Topologically, the low-side switch type step-down unit is equivalent to Buck converter with main switch located on low side. As for the switched inductor step-down unit, it is organized as X-shape connection by two diodes and two inductors. Thanks to stacking two sets of low-side switch type units and configuring two main control switches in the circuit, voltage stress of switching devices are dramatically reduced. Based on the analysis of operation modes and steady-state performance of the converter, SIMPLIS is used to do simulation in order to verify theoretical analysis. A 500 W hardware prototype with 94.1% peak efficiency is built and tested with results demonstrating that the proposed buck converter features large step-down ratio, low voltage stress of switching devices, continuous input current.

Key words: DC-DC converter, large step-down ratio, low voltage stress, cascaded architecture, SIMPLIS simulation

CLC Number:

WAN Wenxuan, LIU Gang, YIN Li, FU Meng. A Novel DC-DC Converter with High Step-down Ratio[J]. Journal of Electrical Engineering, 2021, 16(3): 33-39.

Figures/Tables 12

References 22

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器件名称	电压应力(归一化)
D₁~D₄	1/2
D₇、D₈	D/(2–D)
S₁、S₂	(2+D)/(4–2D)
C₁、C₂	D/2
C₃	D²/(2–D)

拓扑	指标
拓扑	输出电压/V	电压应力/V
经典Buck变换器	225	450
二次Buck变换器	113	675
开关电感Buck变换器	150	600
新型DC-DC变换器	75	375

拓扑	有源开关	无源开关	电容	电感
经典Buck	1	1	1	1
二次Buck	1	3	2	2
开关电感Buck	1	2	1	1
新型DC-DC	2	6	3	4

参数	数值
输入电压/V	450
输出电压/V	24
开关频率/kHz	50
电容C₁、C₂/μF	6.8
电容C₃/μF	47
电感L₁、L₂/μH	208
电感L₃、L₄/μH	54
满载功率/W	500
输出电压纹波系数(%)	2
输出电流纹波系数(%)	25