Circuit arrangement for A.C. operation of high-pressure gas disc

Details Circuit arrangement for A.C. operation of high-pressure gas disc Circuit arrangement for A.C. operation of high-pressure gas disc

1985-03-05

1991-06-18

Moore, David K.

Electric lamp and discharge devices: systems

Plural power supplies

Periodic switch in one of the supply circuits

315209, 315DIG7, H05B 3702

Patent

active

050251970

ABSTRACT:
A circuit arrangement for A.C. operation of high-pressure gas discharge lamps comprising a mains alternating voltage source and a high-frequency oscillator (3) supplied with direct current and which produces a high-frequency current through the lamp superimposed on the mains alternating lamp current. The oscillator comprises a high-frequency transformer (7) and a transistor (11) connected in series with the transformer primary (8). The transistor can be periodically switched on an off. A secondary (9) of the transformer is connected in series with the lamp. Losses are reduced if the ratio between the switching-on and switching-off time (duty cycle) of the transistor (11) is chosen so small that the effective value of the high-frequency current coupled into the lamp lies between 0.05 and 5% of the mains alternating lamp current. An auxiliary device (16 to 19, 25) interrupts the periodic switching of the transistor (11) outside the proximity of the zero passages of the mains alternating lamp current.

REFERENCES:
patent: 3411108 (1968-11-01), Phillips
patent: 4087722 (1978-05-01), Hancock
patent: 4320326 (1982-03-01), Banziger et al.
patent: 4378514 (1983-03-01), Collins
patent: 4392081 (1983-07-01), Brown et al.
patent: 4464607 (1984-08-01), Peil et al.

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