摘要
基于移相控制的全桥逆变电路,超前臂和滞后臂每隔半个工频周期就会交替一次,这将导致全桥开关管的软开关很难实现。采用对称型无源辅助网络的传统方案可保证实现软开关,但注入谐振电流按滞后臂临界条件设计,注入谐振电流较大,会产生较大的无功环流损耗。针对该问题,提出一种可控电感的软开关方案,通过改变谐振电感大小,使注入谐振电流大小能跟随超前臂和滞后臂的变化,实现零电压导通,同时减小无功环流损耗。详细分析了所提可控电感的结构和软开关方案的工作原理,并设计一台100 kHz,200W的样机,相较于硬开关,所提软开关方案的效率提高5.2%。
In full-bridge inverter circuit based on phase-shifted control,the leading arm and the lagging arm alternate every half power frequency cycle,which makes it difficult to realize the soft switching of full-bridge switching tube.The traditional scheme using symmetrical passive auxiliary network can ensure the soft switching,but the injection resonant current is designed according to the critical condition of the lag arm,and the injection resonant current is larger,which results in greater reactive power circulation loss.In order to solve this problem,a soft switching scheme of controllable inductance is proposed in this paper.By changing the strength of resonant inductance,the injected resonant current can follow the change of leading arm and lagging arm,so as to realize zero voltage conduction and reduce reactive power circulation loss at the same time.In addition,the structure of the proposed controllable inductor and the operating principle of the soft switching scheme are analyzed in detail,and a 100 kHz,200 W prototype is designed.Compared with the hard switching,the efficiency of the proposed soft switching scheme is increased by 5.2%.
作者
吴勇海
黄宏俊
夏天浩
WU Yonghai;HUANG Hongjun;XIA Tianhao(Longyan Power Supply Company,State Grid Fujian Electric Power Co.,ltd.,Longyan Fujian 364000,China;Xiamen University of Technology,Xiamen Fujian 361024,China)
出处
《湖北电力》
2024年第5期1-7,共7页
Hubei Electric Power
基金
国网龙岩供电公司2024年检修中心科技项目(项目编号:B31360240005)。
关键词
全桥电路
移相控制
软开关
可控电感
逆变技术
谐振电感
谐振电流
full-bridge converter
phase-shifted control
soft switching
controllable inductor
inverter technology
resonant inductance
resonant current
