Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Electronic Ballast with Modified Valley fill and Charge Pump Capacitor for Prolonged Filaments Preheating and Power Factor Correction

변형된 벨리필 구조와 전하펌프 커패시터가 결합되어 필라멘트 예열기능과 역률개선능력을 가진 형광등용 전자식 안정기

  • Chae, Gyun (Department of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Ryoo, Tae-Ha (Department of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Cho, Gyu-Hyeong (Department of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST))
  • 채균 (한국과학기술원 전기 및 전자공학과) ;
  • 류태하 (한국과학기술원 전기 및 전자공학과) ;
  • 조규형 (한국과학기술원 전기 및 전자공학과)
  • Published : 1999.07.19
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Abstract

A new circuit, modified valley fill (MVF) combined with 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 cost-effective electronic ballast.

Keywords