Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1997-06-30
1999-09-07
Philogene, Haissa
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315362, 315307, 315DIG4, 361 42, G05F 100
Patent
active
059491973
ABSTRACT:
A power supply for a gas discharge lamp includes a converter, a microprocessor switch control circuit, a driver, a switching network having two MOSFET switches, and an output transformer. A cross conduct inhibit circuit is connected in series between the driver and the switching network to prevent simultaneous operation of the switches. The power supply may further include a ground fault interrupt circuit and a ground continuity detector. A dimming module contains a potentiometer input device to vary the brightness of the lamp. The power supply operates at a preset level until the dimming module is connected. The dimming module cannot be removed without shutting off the power supply. The first and second MOSFETs switch first and second voltages across the transformer, thereby causing first and second drive pulses in the periodic output signal. Between the first and second and the second and first drive pulses are first and second dead times. The power supply sets the brightness level of the lamp by varying at least one of the dead time periods.
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Everbrite Inc.
Philogene Haissa
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