Electronic ballast having a symmetric topology

Details Electronic ballast having a symmetric topology Electronic ballast having a symmetric topology

2008-09-05

2011-11-29

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S2090SC, C315S282000, C315S291000

Reexamination Certificate

active

08067902

ABSTRACT:
An electronic ballast for driving a gas discharge lamp having first and second electrodes comprises an inverter circuit and a symmetric resonant tank circuit for minimizing the RFI noise produced at the electrodes of the lamp. The inverter circuit receives a substantially DC bus voltage generates a high-frequency AC voltage. The symmetric resonant tank circuit comprises a split resonant inductor having first and second windings magnetically coupled together. The first and second windings electrically coupled between the respective electrodes of the lamp and the inverter circuit. The symmetric resonant tank further comprises first and second capacitors coupled in series electrical connection between the electrodes of the lamp with the junction of the first and second capacitors coupled to the DC bus voltage at the input of the inverter circuit.

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International Preliminary Report on Patentability dated Mar. 17, 2011 issued in corresponding PCT International Application No. PCT/US2009/003322.

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