两态电流控制PWM开关频率方法的研究

STUDY OF ON-OFF FREQUENCY CONTROL METHOD OF TWO-STATE CURRENT CONTROLLED PWM SYSTEM

本文在仿真分析所得结论的基础上,针对高动态性能的两态电流控制PWM系统开关频率随电机工作点变化的缺陷,提出实用的开关频率闭环控制方法和电路框图,实验结果表明稳频效果良好,在不同的电机转速时开关频率基本保持在给定值。

In this paper, practical on-off frequency closed loop control method and circuit blocks are proposed for highly dynamic charateristic Two-State Current Controlled PWM System which has a disadvantage of that on-off frequency varies with speeds of motor, on the basis of the conclusions obtained by digital simulating analysis. Experimental results show that the on-off frequency basically maintains frequency reference at different speeds of motor with closed loop control.