Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1998-09-30
2000-07-25
Philogene, Haissa
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315291, 315282, 315289, 315224, 315244, 315209R, 363 97, G05F 100
Patent
active
060940174
ABSTRACT:
A dimmer ballast or output drive circuit and a drive method for a high intensity discharge lamp utilizes an overwound loosely coupled transformer having a turns ratio of preferably about one to one with a peaking capacitor across the secondary output terminals of the transformer and in parallel with the HID lamp arc electrodes. A control circuit provides a variable frequency drive voltage to the primary of the transformer. The frequency of the output voltage is adjustably controlled above the peak load power frequency. The load power and hence the light output of the lamp varies according to the frequency of the output voltage permitting a user to adjustably dim the high intensity discharge lamp.
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Electronic Transformers and Circuits, 2.sup.nd Ed., Reuben Lee, pp. 223-224, 234-235, John Wiley Publisher, New York, NY, 1955).
Philogene Haissa
Power Circuit Innovations, Inc.
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