Electronic ballast with integral shutdown timer

Details Electronic ballast with integral shutdown timer Electronic ballast with integral shutdown timer

2011-08-23

2011-08-23

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Time-controlled

C315S119000, C315S224000

Reexamination Certificate

active

08004217

ABSTRACT:
The present invention provides, in one embodiment, a gas discharge lamp ballast with an integral shutdown timer. The ballast includes a circuit for receiving AC power, a converter circuit for converting the AC power to DC power and a square wave oscillator powered from the DC power. A resonant circuit powered by the square wave oscillator supplies power to at least one gas discharge lamp. A time-delay circuit disables the square wave oscillator, without interrupting the DC power supplied to the oscillator, upon the passage of a predetermined period of time from power-up of the AC power. The ballast can be realized with only a marginal increase in cost and size of the ballast.

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http://www.onsemi.com/pub/Collateral/MC14521B-D—visited on or about Aug. 27, 2007.
http://www.geocities.com/CapeCanaveral/Lab/5185/circuit2.html#LONG—currently visited and printed on Apr. 10, 2008, but was available on or about Nov. 14, 2007.

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