充电机移相控制ZVS全桥变换器死区时间优化策略  

Dead Time Optimization Strategy for Phase-shifted Controlled ZVS Full-bridge Converter of Chargers

作　　者：李新 王俊波 张殷 唐明斌 LI Xin;WANG Jun-bo;ZHANG Yin;TANG Ming-bin(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan 528010,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528010 [2]湖南大学,电气与信息工程学院,湖南长沙410082

出　　处：《电力电子技术》2025年第4期117-120,共4页Power Electronics

基　　金：南方电网公司科技项目(GDKJXM20222585)。

摘　　要：移相全桥(PSFB)DC/DC变换器由于具有良好的软开关特性和电气隔离能力被广泛应用于电动汽车充电机。为了减少开关损耗,控制PSFB DC/DC变换器实现零电压软开关(ZVSS)时需要设置合理的死区时间,然而现有的死区时间选择方法无法实现全负载范围内软开关。本文提出一种死区时间分段优化设置策略。首先,定量分析不同负载电流条件下功率器件死区时间的可选区间,并推导数学关系;然后,根据不同负载工况将死区时间优化分为3种情况,提出优化设置方法;最后,研制了一台3.3 kW的移相全桥软开关DC/DC实验样机。实验结果表明,本文所提方法有效解决了PSFB DC/DC输出负载电流变化大时软开关宽负载范围实现困难问题。Phase-shifted full-bridge(PSFB)DC/DC converter has been widely used in the field of electric vehicle charger due to its good soft-switching characteristics and electrical isolation capability.In order to reduce the switching loss,a reasonable dead time is needed to control the DC/DC converter to achieve zero-voltage soft switching.However,the existing dead time selection method is not able to realize the soft-switching in the full load range.To solve this problem,an optimal setting strategy for dead time segmentation is proposed.Firstly,the selectable intervals of the dead time of power devices under different load current conditions are quantitatively analyzed and mathematical relationships are derived.Then,the dead time optimization is divided into three cases according to different load conditions,and the optimization setting method is proposed.Finally,a 3.3 kW PSFB soft-switching DC/DC experimental prototype is developed.The experimental results show that the proposed method in this paper effectively solves the problem of soft-switching wide load range implementation difficulty when the PSFB DC/DC converter output load current varies greatly.

关 键 词：变换器 移相全桥 死区时间 软开关 

分 类 号：TM46[电气工程—电器]