Control circuit for gas discharge lamps, which has a transformer

Details Control circuit for gas discharge lamps, which has a transformer Control circuit for gas discharge lamps, which has a transformer

1995-06-07

1996-11-12

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315226, 315DIG5, H05B 4136

Patent

active

055743382

ABSTRACT:
A control circuit for a gas discharge lamp according to the present invention includes a transformer having a primary run winding, a primary start winding and a secondary winding. The primary run winding is coupled to a source of an AC run signal. The secondary winding is coupled to the gas discharge lamp. A current sensor is coupled in series with the gas discharge lamp to sense current flow through the lamp. A high frequency oscillator is coupled to the primary start winding for providing a high frequency start signal to the primary start winding. In a start phase, the oscillator provides the high frequency start signal to the primary start winding to initiate ionization of the gas discharge lamp. Once the gas has sufficiently ionized in the lamp, the control circuit switches from the start phase to a run phase by removing the high frequency start signal from the primary start winding and applying the AC run signal to the primary run winding. Switching between the high frequency start signal and the AC run signal on the low voltage primary side of the transformer allows the transformer to be sized much smaller to match the operating characteristics of the bulb as opposed to its start characteristics.

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