Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1997-05-07
1999-02-09
Le, Hoanganh
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315127, 315307, H05B 3702
Patent
active
058699350
ABSTRACT:
An electronic ballast (10) for powering at least one gas discharge lamp (20) comprising an AC-to-DC converter (100), an inverter (200), an output circuit (300), and an inverter protection circuit (400). Inverter protection circuit (400) includes a high voltage detection circuit (500), a no-load detection circuit (600), and a latch circuit (700), and is operable to turn off the inverter (200) in response to removal or failure of the gas discharge lamps. Inverter protection circuit (400) is well-suited for use in ballasts that power multiple, parallel-connected lamps and maintains operation of inverter (200) under a partially-loaded condition in which at least one operational lamp is present and each of the failed lamps has at least one open filament.
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Cunningham Gary J.
Labudda Kenneth D.
Le Hoang-anh
Motorola Inc.
Vu David H.
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