Quasi‑resonant flyback PSR converter with adaptive frequency control

Xiong Han; Changyuan Chang; Luyang He

Quasi‑resonant flyback PSR converter with adaptive frequency control

Xiong Han

Changyuan Chang

Luyang He

Vol. 20, No. 2, pp. 341-349, Mar. 2020

10.1007/s43236-020-00044-4

AC–DC converter

Adaptive frequency control

PSR

Valley switching

Abstract

In this paper, a quasi-resonant (QR) flyback primary-side regulation (PSR) converter with adaptive frequency control is proposed. The converter adopts the PSR scheme to detect load information through the auxiliary winding. The converter employs the QR control scheme to switch in the valley mode either in CV or CC operation, which greatly reduces the switching loss. In addition, according to the load condition, the converter adaptively reduces the switching frequency and realize valley switching, which achieves better light-load efficiency in the CV mode. The proposed QR converter was implemented using the HHGRACE 0.35 μm BCD process and verified in a 5 V/1A circuit prototype. Experimental results show that the light-load power efficiency of the proposed converter is improved by up to 4.0% when compared to the conventional QR controller. In addition, the valley switching is realized under different load conditions, which improves the system efficiency in the entire range of output load.

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Cite this article

[IEEE Style]

X. Han, C. Chang, L. He, "Quasi‑resonant flyback PSR converter with adaptive frequency control," Journal of Power Electronics, vol. 20, no. 2, pp. 341-349, 2020. DOI: 10.1007/s43236-020-00044-4.

[ACM Style]

Xiong Han, Changyuan Chang, and Luyang He. 2020. Quasi‑resonant flyback PSR converter with adaptive frequency control. Journal of Power Electronics, 20, 2, (2020), 341-349. DOI: 10.1007/s43236-020-00044-4.