Driver circuit for a plurality of gas discharge lamps

Details Driver circuit for a plurality of gas discharge lamps Driver circuit for a plurality of gas discharge lamps

1991-09-03

1992-08-11

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural series connected load devices

Condenser in the supply circuit

315210, 315239, 315244, 315276, 315312, 315DIG5, 315DIG7, H05B 3700, H05B 3904, H05B 4136

Patent

active

051382334

ABSTRACT:
A circuit (500) for driving two or more series-connected gas discharge lamps, having: an oscillator (518, 520, 522); and a transformer (524) with a primary winding (526) and a secondary winding (528). The transformer secondary winding has first (129A) and second (129B) points connected respectively to first (508) and second (514) output terminals across the series-connected lamps. A capacitor (532) couples the first point of the transformer secondary winding to an intermediate output terminal (112). The voltage produced by the secondary winding thus drives the lamps in series, while the pre-strike voltage produced across the secondary winding is applied across a single lamp (106) to cause it to strike. After striking, current to the intermediate output terminal (512) is limited by the capacitor (532). In this way, the voltage which needs to be produced across the secondary winding to ensure striking of all of the lamps is reduced. In alternative circuits the output terminals across the lamps may be connected to points on the secondary winding further apart than the first and second points (FIG. 6) or intermediate the first and second points (FIGS. 1-4).

REFERENCES:
patent: 4286194 (1981-08-01), Sherman
patent: 4370600 (1983-01-01), Zansky
patent: 4723098 (1988-02-01), Grubbs
patent: 4763239 (1988-08-01), Ball
patent: 5013970 (1991-05-01), Crawford

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