基于电容充放电特性的滞环控制策略

Hysteretic PWM Control Method Based on Capacitor Charging and Discharging

基于电容充放电特性,结合输入电压的间接前馈与输出电压反馈提出了一种新颖的滞环控制策略。该策略实现简单,无需误差放大器及其相应的补偿网络,最后以Buck变换器为例,分析了所提出控制策略的工作原理,并通过仿真和实验结果表明了该控制策略具有比传统脉冲宽度调制法更好的瞬态响应速度和稳态效果。

A hysteretic PWM control method based on the capacitor charging and discharging is proposed in this paper. The proposed control method based on the charging and discharging of capacitance regulates the output voltage of switching converters by the indirect input voltage feed-forward control and output voltage feedback control. The control method is easy to be realized without error amplifier and its corresponding compensation network. The principle and control scheme are analyzed with a Buck converter as an example. Finally, simulation and experimental results verified that the proposed control strategy has much faster transient response and better steady-state results than conventional voltage-mode pulse width modulation （PWM） technique.