Flyback AC-DC Converter with Low THD Based on Primary-Side Control

Changyuan Chang; Luyang He; Zixuan Cao; Dadi Zhao

Flyback AC-DC Converter with Low THD Based on Primary-Side Control

Vol. 18, No. 6, pp. 1642-1649, Nov. 2018

10.6113/JPE.2018.18.6.1642

AC?DC

Fixed duty ratio control distortion

Flyback converter

Low THD

Zero-crossing distortion

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Abstract

A single-stage flyback LED AC-DC converter based on primary-side control under constant current mode is proposed in this study. The proposed converter features low total harmonic distortion (THD) and high power factor (PF). It also consists of a zero-crossing distortion compensation circuit and a variable duty ratio control compensation circuit to deal with the line current distortions caused by fixed duty ratio control. The system model and layout are built in Simplis and Cadence, respectively. The feasibility and performance of the proposed circuit is verified by designing and fabricating an IC controller in the HHNEC 0.35 μm 5 V/40 V HVCMOS process. Experimental results show that the PF can reach a level in the range of 0.985?0.9965. Moreover, the average THD of the entire system is approximately 10%, with the minimum being 6.305%, as the input line voltage changes from 85 VAC to 265 VAC.

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Cite this article

[IEEE Style]

C. Chang, L. He, Z. Cao, D. Zhao, "Flyback AC-DC Converter with Low THD Based on Primary-Side Control," Journal of Power Electronics, vol. 18, no. 6, pp. 1642-1649, 2018. DOI: 10.6113/JPE.2018.18.6.1642.

[ACM Style]

Changyuan Chang, Luyang He, Zixuan Cao, and Dadi Zhao. 2018. Flyback AC-DC Converter with Low THD Based on Primary-Side Control. Journal of Power Electronics, 18, 6, (2018), 1642-1649. DOI: 10.6113/JPE.2018.18.6.1642.