High Efficiency Alternating Current Driver for Capacitive Loads Using a Current-Balance Transformer

Jong-Bok Baek; Bo-Hyung Cho; Joung-Hu Park

High Efficiency Alternating Current Driver for Capacitive Loads Using a Current-Balance Transformer

Jong-Bok Baek

Bo-Hyung Cho

Joung-Hu Park

Vol. 11, No. 1, pp. 97-104, Jan. 2011

10.6113/JPE.2011.11.1.97

Capacitive load

Current balance transformer

energy recovery

Mercury-free fluorescent lamp

Soft-switching

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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 turnratio, 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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Cite this article

[IEEE Style]

J. Baek, B. Cho, J. Park, "High Efficiency Alternating Current Driver for Capacitive Loads Using a Current-Balance Transformer," Journal of Power Electronics, vol. 11, no. 1, pp. 97-104, 2011. DOI: 10.6113/JPE.2011.11.1.97.

[ACM Style]

Jong-Bok Baek, Bo-Hyung Cho, and Joung-Hu Park. 2011. High Efficiency Alternating Current Driver for Capacitive Loads Using a Current-Balance Transformer. Journal of Power Electronics, 11, 1, (2011), 97-104. DOI: 10.6113/JPE.2011.11.1.97.