Ballast with circuit for detecting and eliminating an arc...

Details Ballast with circuit for detecting and eliminating an arc... Ballast with circuit for detecting and eliminating an arc...

2007-02-27

2007-02-27

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S291000, C315SDIG002

Reexamination Certificate

active

11172082

ABSTRACT:
An apparatus for powering a lamp connected to a ballast circuit. A DC bus provides a DC voltage signal to an inverter. A control circuit selectively energizes the inverter to generate an AC signal for powering the lamp load via the rectifier circuit and an inverter circuit. A detection circuit connected between the lamp and inverter generates a detection signal indicating whether an arc condition is present in the circuit. The detection circuit also senses the magnitude of the detection signal and generates a command signal to provide to the control circuit to inhibit power from being supplied to the lamp during an arc condition. A switching circuit is coupled between the output of the detection circuit and circuit ground and responsive to an ignition signal from the control circuit to direct the detection signal to ground during an ignition period.

REFERENCES:
patent: 4488199 (1984-12-01), Bloomer
patent: 5619105 (1997-04-01), Holmquest
patent: 5952794 (1999-09-01), Bergman et al.
patent: 5969483 (1999-10-01), Li et al.
patent: 6128169 (2000-10-01), Neiger et al.
patent: 6720739 (2004-04-01), Konopka
patent: 6809483 (2004-10-01), Alexandrov
patent: 6946807 (2005-09-01), Okamoto et al.
patent: 2005/0046357 (2005-03-01), Stack

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