Electronic ballast protection

Details Electronic ballast protection Electronic ballast protection

2011-06-07

2011-06-07

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315S276000, C315S307000

Reexamination Certificate

active

07956548

ABSTRACT:
An electronic ballast powers at least one fluorescent tube or lamp which has a power source; a DC power supply having an input connected to the power source; an oscillator connected to an output of said DC power supply so as to be driven therefrom; a driver means; and a protection means that deactivates the oscillator when the output reaches a predetermined abnormally high voltage. The protection means includes a transformer; a plurality of windings disposed on the transformer, a delegated winding disposed on the transformer. The protection means includes a sample point for sampling voltage. The protection means deactivates the delegated winding disposed on the transformer for the magnetizing the transformer and stopping oscillation when the sample point reaches a predetermined abnormally high voltage.

REFERENCES:
patent: 2004/0222752 (2004-11-01), Yamanaka et al.
patent: 2008/0278088 (2008-11-01), Yu et al.

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