Single-stage electronic ballast with high-power factor |
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Authors: | Chun-Yoon Park Jung-Min Kwon |
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Affiliation: | 1. POSTECH, Department of Electronic and Electrical Engineering, Pohang University of Science and Technology, Room No. 406, Engineering Bldg. No. 2, Hyojadong, Namgu, Pohang, 790-784 Korea;2. Department of Electrical Engineering, Hanbat University, DaeJeon, Korea |
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Abstract: | This article proposes a single-stage electronic ballast circuit with high-power factor. The proposed circuit was derived by sharing the switches of the power factor correction (PFC) and the half-bridge LCC resonant inverter. This integration of switches forms the proposed single-stage electronic ballast, which provides an almost unity power factor and a ripple-free input current by using a coupled inductor without increasing the voltage stress. In addition, it realises zero-voltage-switching (ZVS) by employing the self-oscillation technique. The saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. Therefore, the proposed single-stage ballast has the advantage of high-power factor, high efficiency, low cost and high reliability. Steady-state analysis of the PFC and the half-bridge LCC resonant inverter are described. The results of experiments performed using a 30 W fluorescent lamp are also presented to confirm the performance of the proposed ballast. |
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Keywords: | electronic ballast power-factor-correction (PFC) single-stage |
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