Research on compensator of control signal in softswitching resonant converter

AN Wendou1, QING Qin2, ZHENG Lei1, LI Zhilin1, WANG Kaiyun1
(1. Chongqing Institute of Coal Science Research Institute, Chongqing 400037, China;
2. College of Automation, Chongqing University, Chongqing 400030, China)

Abstract: 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.
Key words: converter; softswitching; signal delay; frequency tracking