In order to solve the problem of bias magnet and increase the utilization of magnetic core in convertor,a type of convertor with symmetrical half-bridge has been designed.Firstly,simulate the circuit with Simplorer and get the wave form.Then design a convertor prototype with symmetrical half-bridge and high power.Measured results show that the adjustable output current ranges from 0 A to 50 A and the output voltage is 84.5 V,the efficiency is up to 90％,simulation wave form is good agree with the measured data,which can prove the feasibility and correctness of presented method.The convertor with symmetrical half-bridge has the iron core with two-way magnetization,high-usage and no bias phenomenon,which has strong practical value of popularization.%为了提高变换器的磁芯利用率,解决偏磁问题,设计了一种对称半桥变换器.首先利用Ansoft公司的集成仿真软件Simplorer进行仿真分析,得出相应的仿真波形.然后按照仿真电路的参数制作出一个大功率对称半桥变换器样机.实测结果表明:输出电流为0～50 A可调,输出电压为84.5 V,效率高达90％.仿真波形和试验实测波形近似吻合,证明本文仿真分析方法的可行性和正确性.对称半桥变换器铁心双向磁化,利用率高,且不存在偏磁现象,具有很强的实用推广价值.
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