Method and system for eliminating DC bias on electrolytic...

Details Method and system for eliminating DC bias on electrolytic... Method and system for eliminating DC bias on electrolytic...

2007-11-05

2010-06-08

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Plural shunts and/or cut-outs

Reexamination Certificate

active

07733028

ABSTRACT:
A system and method is provided that eliminates DC bias on at least one of a first electrolytic capacitor and a second electrolytic capacitor of a bipolar junction transistor (BJT) based inverter ballast having a shutdown control circuit in association with only one of at least two BJT switches. A duty cycle dependent capacitor is connected in a series with a bus of the ballast, and a resonant circuit, including primary winding of the output transformer and a resonant capacitor. A balancing/charging resistor is connected at one end between the first electrolytic capacitor and the second electrolytic capacitor, and at another end to the duty cycle dependent capacitor and the resonant circuit.

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PCT/US2008/078106 International Search Report, mailed Dec. 23, 2008.
U.S. Appl. No. 11/645,939, filed Dec. 27, 2006, Chen et al.

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