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http://dx.doi.org/10.14801/jkiit.2018.16.11.23

High Efficiency and High Power-Factor Power Supply for LED Lighting Equipment  

Jeong, Gang-Youl (Dept. of Electronic Information Engineering, Soonchunhyang University)
Publication Information
The Journal of Korean Institute of Information Technology / v.16, no.11, 2018 , pp. 23-34 More about this Journal
Abstract
This paper presents the high efficiency and high power-factor power supply for LED lighting equipment. The proposed power supply is the single-stage power structure consisted of the full-bridge diode rectifier and flyback converter, and thus the power-factor correction and output voltage regulation are performed simultaneously using only one controller IC and one power semiconductor switch. Furthermore, the proposed power supply reduces the voltage stress and switching loss of main switch using the regenerative snubber, and it improves the system efficiency using the synchronous rectifier. The applied synchronous rectifier is the new voltage-driven type and its operation and construction are simple. In this paper, the operation principle of proposed power supply is explained through the operation analyses of its power-factor correction and main power conversion parts and the operation of synchronous rectifier is described, briefly. Also, a design example of the power circuit of 40W-class prototype is shown and the operation characteristics of proposed power supply are validated through the experimental results of the implemented prototype by the designed circuit parameter.
Keywords
power supply; LED light equipment; single-stage power structure; regenerative snubber; synchronous rectifier;
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