Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1990-09-28
1992-02-18
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315224, 315225, H05B 4136
Patent
active
050897527
ABSTRACT:
A high frequency PWM power supply for luminous tubes including a low power constant frequency, uniform pulse width generator which charges the intrinsic input capacitance of an insulated junction power FET thereby switching a source of DC voltage across the primary of a high voltage transformer. A current sense resistor and load current compensator discharge the FET gate capacitance upon attaining a predetermined average luminous tube load current. The secondary power supply output includes a series capacitance to minimize tube end discoloration particularly prevalent in mercury luminous tubes. A ground fault detector employing the intrinsic secondary capacitance and transformer core with a dual-peak detector thereby providing enhanced accuracy and ground fault reliability.
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Dinh Tan
Everbrite Inc.
LaRoche Eugene R.
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