关键词: 数字控制系统, 模数转换, 数字重设计法, 数字补偿器, 数字脉宽调制

Abstract: The small signal model of the closed-loop control system for the DC/DC switching power supply in s-domain is built.The digital compensator design is based on digital redesign approach.The analog compensator in s-domain is designed firstly using Bode plot and root-locus techniques，and discretized to a z-domain compensator.The delay effects associated with the AD converter and the DPWM circuits are introduced to build block diagram of the system，so that the impact of sampling rate is considered to improve the design.The digital compensator achieves accurate and programmable control of PWM regulation to ensure high dynamic performance for the closed loop operation of the converter.The simulation results verify the performance of the compensator.

Key words: digital control systems, analog to digital conversion, digital redesign approach, digital compensator, digital pulse-width modulation