Electric lamp and discharge devices: systems – Current and/or voltage regulation – Pre-selectable regulator systems
Patent
1994-12-29
1997-03-18
Pascal, Robert
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Pre-selectable regulator systems
315291, 315307, 315224, 315209R, 315DIG4, 315DIG7, G05F 100
Patent
active
056125976
ABSTRACT:
A circuit and method for driving a load such as a gas discharge illumination device from an ac main supply with a high power factor. The circuit includes a pair of electronic switches arranged in a half bridge configuration and a self oscillating driver circuit having two outputs for driving respective ones of the electronic switches, the electronic switches being coupled across a dc bus voltage and having a switched output coupled to the load. The circuit further includes a voltage regulator circuit coupled across the dc bus voltage and coupled to the self oscillating driver circuit, the voltage regulator circuit maintaining the dc bus voltage within a preset range and preventing the dc bus voltage from exceeding the range if the load is removed or becomes an open circuit. The voltage regulator preferably is a boost regulator switching an inductance. The circuit is particularly suitable for driving gas discharge illumination devices, e.g., fluorescent lamps, at a high power factor with minimum instability of the dc bus.
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Peter N. Wood, "Next Generation Electronic Ballasts Using the New Cost Saving IR2155 MGD, AN-995", Oct. 14, 1993, pp. 13-15.
International Rectifier Corporation
Pascal Robert
Philogene Haissa
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