Title:
ELECTRONIC BALLASTS WITH CURRENT AND VOLTAGE FEEDBACK PATHS
Document Type and Number:
WIPO Patent Application WO2001043263
Kind Code:
A8
Abstract:
A power converter for providing high frequency current to a load such as a fluorescent lamp. A rectifier circuit provides DC power to a half-bridge inverter whose output is connected to one end of a resonant load circuit. One load connection is at the other end of the load circuit, and is connected to one AC-side terminal of the rectifier circuit to provide current feedback. A voltage feedback capacitor is connected between the other AC-side rectifier circuit terminal and the other load connection. The two feedback paths contribute equivalent components to charging current for a bulk capacitor for the DC power to the inverter. Excellent fluorescent lamp ballast performance is obtained with constant inverter frequency, and with either full bridge or voltage doubler embodiments.
Inventors:
CHANG CHIN
Application Number:
PCT/EP2000/011799
Publication Date:
September 13, 2001
Filing Date:
November 24, 2000
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
H05B41/24; H02M1/00; H02M1/42; H02M7/12; H05B41/28; (IPC1-7): H02M1/00; H05B41/28
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