开关频率恒定的电流调节型PWM逆变器

A Current-regulated PWM Inverter with a Constant Switch Frequency

电流调节型 PWM 逆变器常用于高性能的交流伺服控制系统。本文设计的电流滞环调节器的环宽受控于一个非线性频率闭环系统。该系统的频率给定可以根据功率器件的要求选定,以使开关管工作在固定的开关频率。这样,谐波的影响被降低,而且电流跟踪特性大大提高。

A current-regulated PWM inverter is often used in the AC variable speed drive system.Control- ling the width of current hysteresis-loop,a nonlinear frequency close loop is designed in this paper.Its frequency reference is decided by the requests of power components so that the switching frequency is constant.Therefore the effect of harmonic is reduced and the performance of current-followed is improved very much.