Electronic ballast for high-intensity discharge lamp

Details Electronic ballast for high-intensity discharge lamp Electronic ballast for high-intensity discharge lamp

1999-04-12

2000-09-26

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

363 37, 315247, G05F 100

Patent

active

061246816

ABSTRACT:
Disclosed is an electronic ballast for a HID lamp of a high wattage. A conventional AC voltage is filtered for rejecting a noise and is full-wave rectified. The rectified voltage is provided to a power-factor correction circuit. The power-factor correction circuit produces a boosted DC voltage with a high power-factor by charging capacitors while the rectified voltage transferred by a transformer is switched in a high frequency by a MOSFET. A high-frequency driving circuit produces a charge voltage with the boosted DC voltage, flows a discharge current by alternately switching in a high-frequency two switching circuits which use bipolar transistors coupled in a half-bridge type to discharge the charge voltage, and provides a driving power to the HID lamp while generating a resonance with an energy transferred by the discharge current. In order to drive a HID lamp of a high rating power, the switching circuits further includes transformers which enhance base currents of the bipolar transistors, respectively. To drop an operation temperature of the ballast circuit, a plurality of transformers providing a driving power to the HID lamp are arranged in parallel.

REFERENCES:
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patent: 4506195 (1985-03-01), Elms
patent: 5192897 (1993-03-01), Vossough et al.
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patent: 5442261 (1995-08-01), Bank et al.
patent: 5515261 (1996-05-01), Bogdan
patent: 5677602 (1997-10-01), Paul et al.
patent: 5900701 (1999-05-01), Guhilot et al.
patent: 5986901 (1999-11-01), Weng

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