Analysis and Design of a Separate Sampling Adaptive PID Algorithm for Digital DC-DC Converters

作者：Chang, Changyuan^*; Zhao, Xin; Xu, Chunxue; Li, Yuanye; Wu, Cheng'en

来源：Journal of Power Electronics, 2016, 16(6): 2212-2220.

DOI：10.6113/JPE.2016.16.6.2212

• DC-DC converter
• digital controller
• fast transient response
• SSA-PID algorithm

Based on the conventional PID algorithm and the adaptive PID (AD-PID) algorithm, a separate sampling adaptive PM (SSA-PID) algorithm is proposed to improve the transient response of digitally controlled DC-DC converters. The SSA-PID algorithm, which can be divided into an oversampled adaptive P (AD-P) control and an adaptive ID (AD -ID) control, adopts a higher sampling frequency for AD-P control and a conventional sampling frequency for AD-ID control. In addition, it can also adaptively adjust the PID parameters (i.e. K-p, K-i and K-d) based on the system state. Simulation results show that the proposed algorithm has better line transient and load transient responses than the conventional PM and AD-PID algorithms. Compared with the conventional PID and AD-PID algorithms, the experimental results based on a FPGA indicate that the recovery time of the SSA-PID algorithm is reduced by 80% and 67% separately, and that overshoot is decreased by 33% and 12% for a 700mA load step. Moreover, the SSA-PID algorithm can achieve zero overshoot during startup.

• 出版日期2016-11
• 单位东南大学