增量式数字PI环在双向DC/DC变换器中的应用

Implementation of Digital Increment Mode PI Algorithm in Bi-directional DC/DC Converter

基于对数字控制PWM变换器量化误差的分析,提出了一种易于实现的数字控制算法——增量式数字PI控制算法,它可用于数字控制高频DC/DC变换器中并可对输出电压进行稳态调节,通过对该算法的优化还可以抑制输出电压稳态振荡。该控制方案在双向DC/DC的实验装置中得到的了验证,实现了放电过程中电压环的增量式数字PI调节和充电过程中电流环的增量式数字PI调节。

Based on the analysis of the quantized error occured in the digitally controlled PWM converter, this paper presents a digitally controlled strategy,i.e.digital increment mode PI control algorithm, which can be easily implemented in the digitally controlled high switching frequency DC/DC converters, moreover the steady oscillation of output voltage can be effectively suppressed by the optimized control algorithm. The validity of the presented control algorithm is verified by the bidirectional DC/DC prototype, increment mode digital PI modulations for both the voltage feedback during the discharging course and the current feedback during the charging course are realized.This work is supported by National Natural Science Fund of China (No.50237030ZD).