Electronic ballast with life-ended protection

Details Electronic ballast with life-ended protection Electronic ballast with life-ended protection

2008-07-01

2008-07-01

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S24100S

Reexamination Certificate

active

10594781

ABSTRACT:
An electronic ballast includes a rectifier and filter circuit, a DC/AC inverter circuit and a resonant circuit. An input of the rectifier and filter circuit is connected to an outside power supply, its output is connected to the inputs of DC/AC inverter circuit, an output of the DC/AC inverter circuit is connected to inputs of the resonant circuit, and an output of the resonant circuit is connected to a lamp. In addition, a feedback driver circuit and a filament current loop are connected to the lamp at its input. An input of the feedback driver circuit is connected to the filament current loop, and its output is connected to the control terminal of the DC/AC inverter circuit. Electrical signals of the filament current loop control the DC/AC inverter circuit drive the resonant circuit through the feedback driver circuit. The filament capacitor is disconnected from the lamp when the filament is broken.

REFERENCES:
patent: 4459516 (1984-07-01), Zelina et al.
patent: 5583402 (1996-12-01), Moisin et al.
patent: 5761056 (1998-06-01), Noh
patent: 6088249 (2000-07-01), Adamson
patent: 2267607 (1997-11-01), None

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