软开关悬浮斩波器研究

Research on a Soft-switching Maglev Chopper

传统型的两象限H桥悬浮斩波器具有结构简单、性能可靠的优点,但是它的开关损耗大,效率低,发热多,电磁干扰也很严重。随着电力电子技术的发展,有必要用新的技术改造传统型悬浮斩波器。本文介绍一种零转换软开关悬浮斩波器,它在悬浮算法上与传统型悬浮斩波器完全兼容,控制性能没有降低,而且实现了主开关管的零电压转换,开关管工作条件大为改善,正常悬浮时的效率提高到接近90%,电磁兼容性也显著改善。

The traditional tow-quadrant H-bridge maglev chopper is provided with the merit of simple structure and the reliable quality.But it also has the drawbacks of large switching losses,low efficiency, serious heat evolution and EMI.With the development of power electronics,it is necessary to make use of new technology to reform traditional maglev chopper.This paper theoretically proposes a zero transition soft-switching maglev chopper based on the traditional maglev chopper by colligating factors in all aspect.On levitation control the zero transition soft-switching chopper is entirely compatible with the same with the traditional chopper.Furthermore,the zero-voltage transform of main switch is realized,the working conditions of switch are improved greatly,the efficiency of normal suspension is increased to 90%,and the EMI is decreased obviously too.