H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/04 (2006.01) H05B 41/292 (2006.01) H05B 41/38 (2006.01) H05B 41/29 (1990.01)
Patent
CA 2082385
2082385 9120173 PCTABS00009 A ballast for starting and operating a high intensity discharge (HID) lamp in a dc mode includes an oscillator coupled to first and second direct current input terminals. The oscillator includes a high frequency generator driving a pair of semiconductor switches. A first transformer having primary and secondary windings is coupled to the semiconductor switches. A rectifier and voltage multiplier circuit converts the voltage across the secondary winding of the first transformer to a dc voltage. A first energy storage circuit coupled to the rectifier and voltage multiplier circuit stores energy for generating a negative-going, high-voltage spike sufficient for initiating a glow condition in the lamp. A second energy storage circuit, which stores energy for application to the HID lamp during starting insures proper glow-to-arc transition. The starting and operating circuit further includes a control circuit for regulating lamp power in response to control signals received from voltage and current monitoring circuits.
Garrison Robert L.
Rothwell Harold L. Jr.
Gte Products Corporation
R. William Wray & Associates
LandOfFree
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