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

Changyuan Chang; Xin Zhao; Chunxue Xu; Yuanye Li; Cheng'en Wu

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

Vol. 16, No. 6, pp. 2212-2220, Nov. 2016

10.6113/JPE.2016.16.6.2212

DC-DC converter

digital controller

fast transient response

SSA-PID algorithm

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Abstract

Based on the conventional PID algorithm and the adaptive PID (AD-PID) algorithm, a separate sampling adaptive PID (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. Kp, Ki and Kd) based on the system state. Simulation results show that the proposed algorithm has better line transient and load transient responses than the conventional PID 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.

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Cite this article

[IEEE Style]

C. Chang, X. Zhao, C. Xu, Y. Li, C. Wu, "Analysis and Design of a Separate Sampling Adaptive PID Algorithm for Digital DC-DC Converters," Journal of Power Electronics, vol. 16, no. 6, pp. 2212-2220, 2016. DOI: 10.6113/JPE.2016.16.6.2212.

[ACM Style]

Changyuan Chang, Xin Zhao, Chunxue Xu, Yuanye Li, and Cheng'en Wu. 2016. Analysis and Design of a Separate Sampling Adaptive PID Algorithm for Digital DC-DC Converters. Journal of Power Electronics, 16, 6, (2016), 2212-2220. DOI: 10.6113/JPE.2016.16.6.2212.