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

Yang Gu; Dongqian Ju; Lei Wang; Jie Ren; Changyuan Chang

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

Vol. 21, No. 7, pp. 965-973, Jul. 2021

10.1007/s43236-021-00250-8

High-precision constant current

Adaptive closed-loop contro

Primary-side regulation

AC–DC converter

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%.

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Cite this article

[IEEE Style]

Y. Gu, D. Ju, L. Wang, J. Ren, C. Chang, "PSR CC/CV AC–DC converter with an adaptive high‑precision closed‑loop constant current control scheme," Journal of Power Electronics, vol. 21, no. 7, pp. 965-973, 2021. DOI: 10.1007/s43236-021-00250-8.

[ACM Style]

Yang Gu, Dongqian Ju, Lei Wang, Jie Ren, and Changyuan Chang. 2021. PSR CC/CV AC–DC converter with an adaptive high‑precision closed‑loop constant current control scheme. Journal of Power Electronics, 21, 7, (2021), 965-973. DOI: 10.1007/s43236-021-00250-8.