摘要
提出一种新型零电压零电流(ZVZCS)飞跨电容型不对称PWM半桥三电平变换器,该变换器原边开关器件的电压应力为输入电压的一半;所有开关器件在较宽负载范围内实现软开关,其中超前管实现ZVS开通,ZCS关断;滞后管实现ZCS开通,ZVS关断,从而降低开关损耗;副边采用容性整流,在续流阶段将原边电流降至0,使得开关器件的电流分布更加均衡并减小飞跨电容的电流应力;与此同时,消除二极管反向恢复损耗。文中讨论了电路的结构、工作原理和基础特性,为证明理论正确性,搭建一台500 W实验样机,实验证明和理论分析一致,该变换器具有可行性。
A novel zero-voltage and zero-current switching(ZVZCS)flying capacitor asymmetric PWM half-bridge three-level converter is proposed.The voltage stress of the primary switches is half of the input voltage;all switches can realize soft switching in a wide load range,among which the leading switches realize ZVS turn-on,ZCS turn-off.the lagging switches realize ZCS turn-on and ZVS turn-off,which optimize the switching loss.The secondary side adopts capacitive rectification,the primary current is thus reset during the freewheeling stage,which makes the current distribution of the switched more balanced and reduces the current stress of the flying capacitor;at the same time,eliminating the reverse recovery loss of the diode.In this paper,the structure,working principle and basic characteristics of the circuit are discussed.In order to prove the correctness of the theory,a 500 W experimental prototype is built.The experimental proof is consistent with the theoretical analysis,and the converter is feasible.
作者
户毅仁
石勇
徐卓异
黄潮金
HU Yiren;SHI Yong;XU Zhuoyi;HUANG Chaojin(College of Electrical and Control Engineering,Shaanxi University of Science and Technology,Xi’an Shaanxi 710021,China)
出处
《电子器件》
CAS
北大核心
2021年第5期1134-1140,共7页
Chinese Journal of Electron Devices
基金
陕西省教育厅服务地方专项科研计划项目(18JC003)。
