Gyun Chae

Korea Advanced Institute of Science and Technology , Seoul, Seoul, South Korea

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Publications (7)3.11 Total impact

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    ABSTRACT: A new soft recovery (SR) quasi-resonant converter (QRC) having a multiple order valley fill network is introduced. It is combined with a normal quasi-resonant converter with a valley fill network of which the surrounding components are composed of diodes and capacitors. The reverse recovery loss of the main rectifier diode is eliminated by this method utilizing multiple resonance. The proposed converter has PWM capability with high efficiency and is suitable for high voltage and high power applications. By extension of this concept to other switching converters, a new family of SR PWM QRC can be shown
    Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE; 02/1999
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    ABSTRACT: A new circuit, modified valley fill (MVF) combined with a resonant inductor of the self-excited resonant inverter and charge pump capacitors (CPCs), is presented to achieve high PF electronic ballast providing sufficient preheat current to lamp filaments for soft start maintaining low DC bus voltage. The MVF can adjust the valley voltage higher than half the peak line voltage. The CPCs draw the current from the input line to make up the current waveform during the valley interval. The measured PF and THD are 0.99 and 12%, respectively. The lamp current CF is also acceptable in the proposed circuit. The proposed circuit is suitable for implementing a cost-effective electronic ballast
    Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE; 02/1999
  • G. Chae, Y.S. Youn, G.H. Cho
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    ABSTRACT: A new simple low cost high power factor correction circuit for electronic ballast employing a current source type push-pull resonant inverter is proposed. The proposed circuit provides high power factor, low current harmonic distortion, self-power-controlling operation for load variations and cost-effectiveness
    Electronics Letters 11/1998; · 1.04 Impact Factor
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    ABSTRACT: A new cost-effective power factor correction (PFC) circuit, the improved valley fill (IVF) circuit combined with charge pumping capacitors (CPCs), used as an electronic ballast for fluorescent lamps is proposed. The IVF can adjust the valley voltage higher than half of the peak line voltage. The CPCs draw current from the input line to make up the current waveform during the valley interval. The measured power factor and total harmonic distortion for a prototype electronic ballast are 0.996 and 5.5%, respectively
    Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE; 06/1998
  • G. Chae, G.H. Cho
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    ABSTRACT: A new low-cost high power factor correction circuit for electronic ballast employing current-source type push-pull resonant inverter (CS-PPRI) is proposed. The proposed circuit provides good power factor correction, low current harmonic distortion and cost-effectiveness. The prototype meets the IEC555-2 requirements satisfactorily
    Electronics Letters 04/1998; · 1.04 Impact Factor
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    ABSTRACT: A new PF correction topology, improved valley fill (IVF) with valley boost converter (VBC) used in the electronic ballast for a fluorescent lamp is presented. Different from the conventional valley fill, the IVF has different charging operation to the electrolytic capacitors and can adjust the valley voltage higher than half the peak line voltage. Hence, there is no pulsating line current around the line voltage peak, PF and THD are significantly improved. The IVF also improves lamp current crest factor (CF) by the energy transfer action. The VBC is added to the IVF to achieve unity PF and to increase the valley voltage. The VBC operates only during valley region to decrease the loss of switching devices and the voltage stress of the resonant inverter. The VBC can be constructed with small size and low cost having very simple controller. The measured PF and THD for a prototype electronic ballast are 0.997 and 5%, respectively, and the lamp current CF is as low as 1.5
    Power Electronics Specialists Conference, 1997. PESC '97 Record., 28th Annual IEEE; 07/1997
  • G. Chae, Y.S. Youn, G.H. Cho
    [Show abstract] [Hide abstract]
    ABSTRACT: A new low-cost high power factor correction circuit for electronic ballast is presented. The proposed circuit provides good power factor correction, low current harmonic distortion and cost-effectiveness. The prototype meets the IEC555-2 requirements satisfactorily with a power factor of nearly unity
    Electronics Letters 06/1997; · 1.04 Impact Factor

Publication Stats

30 Citations
3.11 Total Impact Points

Institutions

  • 1997–1998
    • Korea Advanced Institute of Science and Technology
      • Department of Electrical Engineering
      Seoul, Seoul, South Korea