Study Of Improved Half Bridge Zero Current Transition Resonant Converter

With the development of power electronics technology, Pulse Width ModulationDC-DC converters get more and more application. Nowadays, high performance highefficiency and light weight are the most important performance figure of all kinds of PWMDC-DC converters. In order to increase the power density and output efficiency, the softswitching techniques is the key. For half –bridge PWM DC/DC converter used IGBT, Zero-current-switching is betterthen Zero-voltage-switching. In the zero-current-switching techniques, zero currenttransition technique is much better then others, but the auxiliary switch is turned off withhard switching. In order to get rid of this shortage, a improved half–bridge zero currenttransition resonant DC/DC converter is designed, its main switches and the auxiliary onesare turned off under zero current in the wide range. In this paper, the operating principles of improved half-bridge zero current transitionresonant DC/DC converter are discussed firstly and its advantages and disadvantages areanalyzed respectively. The famous CAD simulation software is used to simulate the proposecircuit. Then, small-signal model of the new topology is obtained by using state-spaceaveraging. This model is used to analyze stability of the new converter. Third, the design ofmain circuit and control circuit are developed, the parameters of main circuit are given, asimple and effective control circuit is designed, the circuit can drive two pair of mainswitches and auxiliary ones . At last, on the basis of theory analysis and hardware design,experimental results are given. In conclusion, the correctness and feasibility of the new converter are proved by theoryanalysis, simulation research and experimental validation.