Ballast with end-of-lamp-life protection circuit

Details Ballast with end-of-lamp-life protection circuit Ballast with end-of-lamp-life protection circuit

2006-09-05

2006-09-05

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

C315S274000, C315S291000, C315S312000, C315S2090SC

Reexamination Certificate

active

07102297

ABSTRACT:
An electronic ballast (10) for powering a lamp load comprising an even number of gas discharge lamps (30,32, . . . ,34,36) includes an inverter (300), an output circuit (400), and a protection circuit (500). During operation, protection circuit (500) disables the inverter (300) in response to an end-of-lamp-life condition that is characterized by a predetermined imbalance in the operating current provided to each of the even number of lamps. Preferably, the output circuit (400) includes a current-sensing transformer (480) for detecting the predetermined imbalance, and the protection circuit (500) includes a silicon-controlled rectifier (530) for disabling the inverter (300).

REFERENCES:
patent: 5930126 (1999-07-01), Griffin et al.
patent: 6008593 (1999-12-01), Ribarich
patent: 6292339 (2001-09-01), Brooks
patent: 6696798 (2004-02-01), Nishimoto et al.

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