摘要
针对谐振型逆变器输出电压波形畸变及开关管发烫的问题,分析了逆变器的拓扑结构及软开关控制原理,推导了并联谐振的频率响应特性,分析了波形过零点畸变的原因是由于芯片响应时间对控制信号产生了时延。针对信号时延问题,设计了基于CD4046锁相环频率跟踪技术的补偿电路,给出了补偿电路的电路图。最后,研究结果表明所设计的补偿电路有效地减小了芯片响应时间对逆变器造成的影响,使电路工作在软开关状态下,减少了开关器件的动态损耗。
Aiming at the problems of distorted waveform and hot switches of the converter,the topology and soft-switching control principle of the converter was analyzed,the frequency response of parallel resonant circuit was deduced,the output waveform of the converter was showed,the aberrance of waveform in zero-crossing was found and the delay which the response time of the chips to the control signal was the reason.Aiming at the problem of signal delay,the compensatory circuit of phased-lock frequency tracking technology based on CD4046 was designed and the schematic circuit was given.At last,The results indicate that the designed compensatory circuit decreases the affect of response time to the converter,makes sure the converter work under soft-switching state and decreases the dynamic loss of the switches.
出处
《机电工程》
CAS
2011年第2期248-250,254,共4页
Journal of Mechanical & Electrical Engineering
关键词
逆变器
软开关
信号时延
频率跟踪
converter
soft-switching
signal delay
frequency tracking
