Single-stage line-coupled half-bridge ballast with unity power factor and ripple-free input current using a coupled inductor
Hyun-Lark Do
Bong-Hwan Kwon
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec. 2003
Volume: 50,
Issue: 6
On page(s): 1259- 1266
ISSN: 0278-0046
INSPEC Accession Number: 7964623
Digital Object Identifier: 10.1109/TIE.2003.819663
Current Version Published: 2004-01-08
Abstract
A single-stage line-coupled half-bridge ballast with unity power factor and ripple-free input current using a coupled inductor is proposed. The proposed power-factor-correction circuit can achieve unity power factor and ripple-free input current using a coupled inductor. A saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. The proposed ballast has high energy efficiency, low cost, and high reliability compared to the conventional high-power-factor electronic ballasts. Experimental results obtained on a 30-W fluorescent lamp is discussed.
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