Electronic ballast with fault-protected series resonant output c

Details Electronic ballast with fault-protected series resonant output c Electronic ballast with fault-protected series resonant output c

1998-04-17

1999-11-09

Shingleton, Michael B

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315205, 315244, 315307, 315324, H05B 3702

Patent

active

059821094

ABSTRACT:
An electronic ballast (100) for powering at least one gas discharge lamp (10) comprises an inverter (200) and an output circuit (300). Output circuit (300) comprises a resonant inductor (310), a resonant capacitor (330), a DC blocking capacitor (360), a first rectifier (350), and a second rectifier (370). Output circuit (300) prevents excessive current flow and power dissipation in the event of lamp removal or failure, and provides automatic ignition following lamp replacement. In an alternative embodiment, a ballast (160) for powering two lamps (10,20) includes a pair of modified output circuits (500,600) and a ground-referenced lamp return wire (504) for accommodating conventional instant-start type wiring.

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