Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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High Efficiency Alternating Current Driver for Capacitive Loads Using a Current-Balance Transformer

  • Baek, Jong-Bok (Dept. of Electrical Eng. & Computer Sci., Seoul National University) ;
  • Cho, Bo-Hyung (Dept. of Electrical Eng. & Computer Sci., Seoul National University) ;
  • Park, Joung-Hu (Dept. of Electrical Eng., Soongsil University)
  • Received : 2010.02.01
  • Published : 2011.01.20
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Abstract

This paper proposes a new alternating current driving method for highly capacitive loads such as plasma display panels or piezoelectric actuators, etc. In the proposed scheme, a current balance transformer, which has two windings with the same turn-ratio, provides not only a resonance inductance for energy recovery but also a current balance among all of the switching devices of the driver for current stress reduction. The smaller conduction loss than conventional circuits occurs due to the dual conduction paths which are parallel each other in the current balance transformer. Also, the leakage inductances of the transformer are utilized as resonant inductors for energy recovery by the series resonance to the capacitive load. Furthermore, the resonance contributes to the small switching losses of the switching devices by soft-switching operation. To confirm the validity of the proposed circuit, prototype hardware with a 12-inch mercury-free flat fluorescent lamp is implemented. The experimental results are compared with a conventional energy-recovery circuit from the perspective of luminance performances.

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