摘  要：文章将软开关技术应用于斩波式内反馈串级调速系统中，主要讨论其斩波部分的软开关技术。对内反馈电机的调速原理、硬开关和软开关的优缺点做了简单介绍。对移相全桥ZVZCS PWM DC-DC软开关变换器工作原理做了较详细的阐述，用Matlab/Simulink仿真软件对其工作特性进行了仿真分析，并进行了实验研究，仿真和实验结果验证了理论分析的正确性。
关键词：内反馈；串级调速；软开关；斩波器

Abstract: Compare to the hard-switching of traditional circuit,The soft-switching technology has many advantages.In this paper，Soft-switching technology was used in chopper-styles internal-feedback cascade speed regulation system,and soft-switching technology was mainly discussed.Introduced the principle of internal-feedback cascade speed regulation system,the advantages and disadvantages of hard-switching and soft-switching.The operation principle and parameter design of zero-voltage & zero-current-switching PWM DC/DC full-bridge converters were introduced detailedly.The simulation by Matlab/Simulink software was proformed to analyze the converters working characteristics，The experimental and simulation results show the theoretical analysis is correct.  Key Words: Internal-feedback；Cascade speed regulation；Soft-switching；Chopper