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Open AccessArticle

A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

1
Department of Electrical Engineering, I-Shou University, Kaohsiung 84001, Taiwan
2
Department of Electrical Engineering, National Formosa University, Hu-Wei, Yunlin 63201, Taiwan
3
Department Electrical Engineering, Far East University, Tainan 74448, Taiwan
4
Department of Electrical Engineering, Cheng Shiu University, Kaohsiung 83347, Taiwan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2775; https://doi.org/10.3390/app10082775
Received: 12 March 2020 / Revised: 8 April 2020 / Accepted: 13 April 2020 / Published: 16 April 2020
(This article belongs to the Section Applied Industrial Technologies)
This paper proposes a dimmable light-emitting diode (LED) driver featuring a high power factor and zero-voltage switching on (ZVS). The circuit is obtained by integrating a boost converter and a dc-dc converter with half-bridge topology. The high power factor is achieved by operating the boost converter in discontinuous current mode (DCM). The LEDs are dimmed by the control scheme of asymmetrical pulse-width modulation (ASPWM). The developed circuit eliminates the inherited dc-offset current of the transformer in a conventional asymmetrical half-bridge converter by introducing a balance capacitor. Both active switches can operate at ZVS by freewheeling the boost inductor current and the transformer magnetizing current to discharge the energy stored in their parasitic capacitance. The circuit operation is analyzed in detailed, and mathematical equations are derived. Finally, a 115-W prototype circuit for driving high brightness LEDs was built and tested. The experimental results verify the feasibility of the proposed LED driver with satisfactory performance. It can achieve a high power factor and ZVS operation. View Full-Text
Keywords: asymmetrical pulse-width modulation (ASPWM); half-bridge converter; light-emitting diode (LED); power-factor correction; zero-voltage switching on (ZVS) asymmetrical pulse-width modulation (ASPWM); half-bridge converter; light-emitting diode (LED); power-factor correction; zero-voltage switching on (ZVS)
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MDPI and ACS Style

Cheng, H.-L.; Chang, Y.-N.; Hwang, L.-C.; Yen, H.-C.; Chan, S.-Y.; Yang, W.-F. A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter. Appl. Sci. 2020, 10, 2775.

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