Electronic ballast having a protective circuit for a...

Details Electronic ballast having a protective circuit for a... Electronic ballast having a protective circuit for a...

2007-03-27

2007-03-27

Wong, Don (Department: 2163)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S224000, C315S291000, C363S021080, C363S021100

Reexamination Certificate

active

10963533

ABSTRACT:
The invention relates to an electronic ballast for lamps having a converter, in which a switching transistor is protected against transient disturbances by a detection circuit C1, C2, R1, R2, D1–3, T1. In this case, the time derivative of the voltage is taken into consideration.

REFERENCES:
patent: 3702434 (1972-11-01), Ryan
patent: 3946280 (1976-03-01), Quist
patent: 4020408 (1977-04-01), Grant
patent: 4884180 (1989-11-01), Hoffmann
patent: 5430405 (1995-07-01), Cohen
patent: 5677602 (1997-10-01), Paul et al.
patent: 6181079 (2001-01-01), Chang et al.
patent: 6690122 (2004-02-01), Weirich
patent: 2004/0041621 (2004-03-01), Limmer
patent: 2004/0051479 (2004-03-01), Weirich
patent: 101 10 239 (2002-07-01), None

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