Circuit arrangement for operating high-pressure gas discharge la

Details Circuit arrangement for operating high-pressure gas discharge la Circuit arrangement for operating high-pressure gas discharge la

1984-07-23

1986-06-10

Moore, David K.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315287, 315DIG7, H05B 4124, H05B 4114

Patent

active

045945314

ABSTRACT:
A circuit arrangement for operating high-pressure gas discharge lamps (6) with a current of higher frequency comprising a switching mains section including a switching transistor (4) and a control device (9), in which an upper and a lower reference current level (O,U) are produced. The switching transistor is switched to the non-conducting state when the lamp current exceeds the upper level (O) and is switched to the conducting state when this current falls below the lower level (U). The interval between the reference current levels (O,U) is more than 10% of the average lamp current and a further intermediate reference current level (M) is provided at which the switching transistor is switched each time at a predetermined number of passages of the lamp current through the intermediate reference current level.

REFERENCES:
patent: 3265930 (1966-08-01), Powell, Jr.
patent: 3486070 (1969-12-01), Engel
patent: 3657598 (1972-04-01), Nomura et al.
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4051411 (1977-09-01), Knoble et al.
patent: 4132925 (1979-01-01), Schmutzer et al.
patent: 4412154 (1983-10-01), Klein
patent: 4412156 (1983-10-01), Ota
patent: 4456855 (1984-06-01), Sairanen

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