Electronic ballast

Details Electronic ballast Electronic ballast

2007-04-03

2007-04-03

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

C315S106000, C315S107000

Reexamination Certificate

active

11124012

ABSTRACT:
An electronic ballast capable of extending life of the fluorescent lamp is disclosed. The electronic ballast according to the present invention comprises a DC/AC converter, a fluorescent lamp, a transformer, a preheating transformer and an AC switch. Wherein, the AC switch is turned off during a preheating period of time for the fluorescent lamp. Due to adoption of a preheating transformer in the secondary side and an AC switch for the electronic ballast according to the present invention, the voltage drop across the fluorescent lamp can be reduced during the preheating period of time, and accordingly no glow current would appear. Therefore, life of the electronic ballast can be effectively extended.

REFERENCES:
patent: 4438370 (1984-03-01), Allington
patent: 6114810 (2000-09-01), Foo
patent: 1400852 (2003-03-01), None

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