[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.1007/s43236-021-00250-8

PSR CC/CV AC-DC converter with an adaptive high-precision closed-loop constant current control scheme

Gu, Yang (School of Microelectronics, Southeast University)
Ju, Dongqian (School of Microelectronics, Southeast University)
Wang, Lei (School of Microelectronics, Southeast University)
Ren, Jie (School of Microelectronics, Southeast University)
Chang, Changyuan (School of Microelectronics, Southeast University)

Publication Information

Journal of Power Electronics / v.21, no.7, 2021 , pp. 965-973 More about this Journal

Abstract

A primary-side regulation (PSR) constant current (CC) output and constant voltage (CV) output AC-DC converter is proposed and an adaptive high-precision closed-loop constant current control scheme is put forward in this paper. In the CC mode, the converter adopts the closed-loop control strategy to realize that the switching period adaptively converges to twice the demagnetization time, which realizes the CC output. In addition, exactly detecting the demagnetization time is a prerequisite for obtaining a high-precision output current. Therefore, a demagnetization time detection circuit is designed to provide accurate and reliable demagnetization information. The control IC was fabricated with the Nuvoton 0.5um BCD process, and a 5 V/2 A prototype circuit was implemented to verify its performance. Experimental results show that the CC deviation is within ± 1.4%, which is lower than the target value of ± 2.0%. Under different loads and AC inputs, the conversion efficiency in the CC mode varies between 76.3% and 80.7%.

Keywords

High-precision constant current; Adaptive closed-loop control; Primary-side regulation; AC-DC converter;

Citations & Related Records

Reference

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