一种具有大降压比的新型DC-DC变换器*

doi:10.11985/2021.03.005

电气工程学报 ›› 2021, Vol. 16 ›› Issue (3): 33-39.doi: 10.11985/2021.03.005

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一种具有大降压比的新型DC-DC变换器^*

万文轩¹(), 刘纲¹(), 尹力¹(), 傅萌²()

1.国网湖北省电力有限公司武汉供电公司武汉 430000
2.东南大学电气工程学院南京 210096

收稿日期:2020-10-21 修回日期:2020-11-26 出版日期:2021-09-25 发布日期:2021-10-29
作者简介:万文轩,男,1970年生,工程师。主要研究方向为用电信息采集,分布式电源等。E-mail： wanwx1@126.com
刘纲,男,1977年生,工程师。主要研究方向为电力营销,分布式电源等。E-mail： shifuggyy@163.com
尹力,女,1989年生,硕士,工程师。主要研究方向为用电信息采集,分布式电源等。E-mail： gyqfcgp@126.com
傅萌,女,1983年生,博士。主要研究方向为微网协同技术、综合能源优化等。E-mail： tianshanfeiniao1@126.com
基金资助:
* 国家重点研发计划资助项目(2020YFF0426410)

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

WAN Wenxuan¹(), LIU Gang¹(), YIN Li¹(), FU Meng²()

1. Wuhan Power Supply Company of State Grid Hubei Power Company, Wuhan 430000
2. School of Electrical Engineering, Southeast University, Nanjing 210096

Received:2020-10-21 Revised:2020-11-26 Online:2021-09-25 Published:2021-10-29

摘要/Abstract

摘要：

在一定占空比下,研究一种具有更大降压比和低开关电压应力的新型DC-DC变换器。该变换器由低侧开关型降压单元和开关电感型降压单元级联而成。其中,低侧开关型降压单元在拓扑上等同于主控开关位于低侧的Buck电路;开关电感型降压单元则由两个二极管与两个电感以X型方式连接而成。用两套低侧开关型降压单元相互堆叠以及配置两个主控开关的方式来大幅降低开关器件的电压应力。在对该变换器的工作模态与稳态特性进行分析的基础上,使用SIMPLIS对理论分析进行仿真验证。调试了一台功率为500 W的硬件样机,试验结果表明该变换器具备降压比大、开关器件电压应力低、输入电流连续的特点。

关键词: DC-DC变换器, 大降压比, 低电压应力, 级联架构, SIMPLIS仿真

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

中图分类号:

万文轩, 刘纲, 尹力, 傅萌. 一种具有大降压比的新型DC-DC变换器^*[J]. 电气工程学报, 2021, 16(3): 33-39.

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.

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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

一种具有大降压比的新型DC-DC变换器^*

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

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