Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Patent
1997-07-09
1999-05-25
Wong, Don
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
315291, 315307, H05B 3702
Patent
active
059072237
ABSTRACT:
An AC-AC ballast system for a discharge lamp (e.g., a fluorescent lamp), which includes a PFC converter which incorporates an isolation transformer, and a DC-AC inverter provided on the secondary side of the isolation transformer. Because the AC line input is isolated from the lamp load by the transformer in the PFC converter, the switching frequency of the PFC converter can be advantageously significantly higher than the lamp current frequency (and the switching frequency of the DC-AC inverter), to thereby enable a significant reduction in the size and weight of the ballast system, without an increase in the emission of EMI radiation from the lamp. In this regard, the ballast system of the present invention can be thought of as a two-frequency ballast system having an isolated PFC converter.
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Gu Wen-Jian
Liu Rui
Blocker Edward
Franzblau Bernard
Philips Electronics North America Corporation
Vu David H.
Wong Don
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