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Appl. Sci. 2018, 8(8), 1408; https://doi.org/10.3390/app8081408

A Single-Stage High-Power Factor Converter with Synchronized Self-Excited Technique for LED Lighting

1
Department of Electrical Engineering, National Formosa University, Yunlin County 63201, Taiwan
2
Department of Electrical Engineering, Cheng Shiu University, Kaohsiung 83347, Taiwan
3
Department of Electrical Engineering, I-Shou University, Kaohsiung 84001, Taiwan
*
Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 3 August 2018 / Accepted: 16 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Smart Lighting)
Full-Text   |   PDF [5151 KB, uploaded 20 August 2018]   |  

Abstract

This paper proposes a single-stage, high power-factor light-emitting diode (LED) driver with a self-excited control scheme for the power switches. The self-excited mechanism is accomplished by fetching the driving voltages from a center-tapped transformer. The frequency of the driving voltages is exactly the same as the resonant frequency of the resonant converter, thus synchronizing the resonant frequency with the switching frequency and achieving zero-voltage switching (ZVS) and zero-current switching (ZCS) of power switches. The circuit topology is mainly composed of a half-bridge LC resonant converter, along with a boost-type power-factor corrector (PFC) to fulfill the single-stage structure, meaning that the presented LED driver possesses high power-factor features and low switching loss. Finally, a 40 W prototype circuit is implemented and tested, and the experimental results exhibit a satisfactory performance. View Full-Text
Keywords: light-emitting diode (LED); power-factor correction; self-excited; single stage; soft switching light-emitting diode (LED); power-factor correction; self-excited; single stage; soft switching
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Chang, Y.-N.; Chan, S.-Y.; Cheng, H.-L. A Single-Stage High-Power Factor Converter with Synchronized Self-Excited Technique for LED Lighting. Appl. Sci. 2018, 8, 1408.

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