电动汽车车载移相全桥变换器改进研究  

Improvement of phase-shifted full-bridge converter for electric vehicle

作　　者：金宁治[1] 俄立明 马腾[1] 刘金凤[1] 孙东阳[1] JIN Ning-zhi;E Li-ming;MA Teng;LIU Jin-feng;SUN Dong-yang(Engineering Research Center of Automotive Electronics Drive Control and System Integration,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学汽车电子驱动控制与系统集成教育部工程研究中心,哈尔滨150080

出　　处：《电机与控制学报》2021年第9期70-77,共8页Electric Machines and Control

基　　金：国家重点研发计划项目(2019YFE0100200)。

摘　　要：为提高电动汽车车载电源的效率,针对传统移相全桥DC/DC变换器的副边占空比丢失、变压器磁饱和、副边寄生振荡等问题,提出改进型的移相全桥拓扑结构,通过增加原副边的变比来减小占空比的丢失,串联隔直电容防止变压器磁饱和,采用二极管钳位电路抑制副边二极管的电压振荡。在详细分析移相全桥零电压开关(ZVS)控制策略的基础上,针对该拓扑结构的不同工作状态,分析了钳位二极管的工作原理,明确了变压器和谐振电感位置对电路的影响效果,探讨了副边同步整流在拓扑中的作用。得出该拓扑结构可以将MOS管的应力抑制在输入电压范围之内。最后研制了一台3 kW的样机,采用PI控制策略,通过仿真与实验结果验证了理论分析的正确性。In order to improve efficiency of the on-board power supply of electric vehicles,an improved phase-shifted full-bridge topology was proposed to solve the problems of secondary-side duty cycle loss,transformer magnetic saturation,and secondary-side parasitic oscillation of traditional phase-shifted full-bridge DC/DC converters.By reducing the loss of duty cycle by increasing the ratio of the primary and secondary sides,series DC blocking capacitors prevent the transformer from magnetic saturation,and a diode clamping circuit was used to suppress the voltage oscillation of the secondary side diodes.Based on a detailed analysis of the phase-shifted full-bridge zero-voltage-switch(ZVS)control strategy,the working principle of the clamping diode was analyzed for the different operating states of the topology,and effect of the transformer and resonant inductor position on the circuit was clarified.The role of secondary-side synchronous rectification in the topology was discussed.It is concluded that the topology can restrain the stress of the MOS tube within the input voltage range.Finally,a prototype of 3 kW was developed.The PI control strategy was used to verify correctness of the theoretical analysis through simulation and experimental results.

关 键 词：电动汽车 移相全桥 零电压开关 PI控制 钳位二极管 同步整流 

分 类 号：TM46[电气工程—电器]