双变压器型串联谐振变换器全范围软开关设计

doi:10.16183/j.cnki.jsjtu.2023.389

摘要/Abstract

摘要：

为了解决双桥谐振变换器(DBRC)轻载条件下回流功率过大、失去零电压开关(ZVS)运行的问题,设计了一种双变压器型串联谐振变换器(DTSRC).该变换器采用双变压器结构,有效降低了变压器两端所受电压应力.通过优化高频变压器变比系数,DTSRC在轻载条件下能够保证开关管实现ZVS运行,降低变换器开关损耗.同时,采用最小电流轨迹(MCT)控制策略,使二次侧电压与电流同相位运行,实现同步整流,消除回流功率,并降低变换器导通损耗.最后,搭建200 W/100 kHz的变换器样机来验证方案的有效性.实验结果表明:DTSRC的开关管在全负载范围内均能实现ZVS运行,整体运行效率超过90%.

关键词: 串联谐振变换器, 零电压开关, 最小电流, 开关损耗, 导通损耗

Abstract:

A dual-transformer series resonant converter (DTSRC) is proposed to solve the problem of excessive return power and loss of zero voltage switching (ZVS) operation under light load in the dual bridge resonant converter (DBRC). A dual-transformer structure is employed on the proposed converter, which can significantly reduce voltage stress across the transformers. Additionally, the ZVS operation under light-load conditions is achieved and switching losses are minimized by optimizing the turns ratio coefficient. To eliminate backflow power and reduce conduction loss, a minimum current trajectory (MCT) control strategy is implemented for the DTSRC. Thus, synchronous rectification is realized on the secondary side, which makes the converter always operate with minimum current. Finally, a 200 W/100 kHz prototype is built to verify the effectiveness of the proposed solution. The experimental results demonstrate that the ZVS of all active switches is achieved during full power ranges, and the overall operating efficiency of DTSRC exceeds 90%.

Key words: series resonant converter, zero voltage switching (ZVS), minimum current, switching loss, conduction loss

中图分类号:

TM461
TM462

李翼男, 胡松, 李晓东, 陈武, 钟黎萍, 杨晴晴. 双变压器型串联谐振变换器全范围软开关设计[J]. 上海交通大学学报, 2025, 59(6): 789-799.

LI Yinan, HU Song, LI Xiaodong, CHEN Wu, ZHONG Liping, YANG Qingqing. Dual-Transformer Series Resonant Converter with Full Range ZVS Operation[J]. Journal of Shanghai Jiao Tong University, 2025, 59(6): 789-799.

图/表 13

图1

图2

图3

表1

各开关管ZVS条件汇总

开关管	ZVS条件
M_A, M_B	2Mcos γ- $1 k$ cos α-1<0
M_C, M_D	2Mcos(γ-α)-cos α- $1 k$ <0
M_E, M_F, M_G, M_H	2M-cos γ- $1 k$ cos(γ-α)>0

表1

图4

图5

图6

图7

图8

图9

图10

图11

图12

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