Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1995-02-10
1996-01-30
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315362, 315209R, G05F 100
Patent
active
054882699
ABSTRACT:
A multi-resonant boost power factor correction circuit includes a full-wave rectifier; a high frequency filter capacitance coupled across the input terminals of the full-wave rectifier; a series half-bridge converter; a diode connected between the output of the rectifier and the dc bus voltage such that its cathode is connected to a dc bus; a capacitance coupled between the output of the rectifier and the junction between the series-connected switching devices of the half-bridge converter; a resonant load circuit connected to the junction between the switching devices, including a resonant inductor, a resonant capacitor and a load, such as a fluorescent discharge lamp; and a driver circuit for alternately switching the switching devices via a dead time control for selecting a dead time after one of the devices switches off and the other device switches on. The multi-resonant boost high power factor circuit meets the IEC standard for low harmonic content on input current, thus operating with a very high power factor, and operates with a minimal number of circuit components. In addition, the circuit meets lamp current crest factor specifications for fluorescent discharge lamp ballasts and requires lower voltage power devices.
REFERENCES:
patent: 4642745 (1987-02-01), Stiegerwald et al.
patent: 4782268 (1988-11-01), Fahurich et al.
patent: 4808887 (1989-02-01), Fahnrich et al.
patent: 5008597 (1991-04-01), Zuchtriegel
patent: 5134556 (1992-07-01), Courier de Mere
Serial No. 07/934,843, "Power Supply Circuit with Power Factor Correction," L. R. Nerone et al., filed Aug. 25, 1992.
Serial No. 08/386,570, "Variable Frequency Generator For Resonant power Feedback" S-A El-Hamamsy et al., filed Feb. 10, 1995.
"Disturbances in Supply Systems Caused by Household Appliances and Similar Electrical Equipment," Brtish Standard 5406, Part 2, 1988.
El-Hamamsy Sayed-Amr
Kachmarik David J.
Kheraluwala Mustansir H.
Breedlove Jill M.
General Electric Company
Pascal Robert J.
Ratliff Reginald A.
Snyder Marvin
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