DC/AC converter for feeding a metal vapor discharge tube

Details DC/AC converter for feeding a metal vapor discharge tube DC/AC converter for feeding a metal vapor discharge tube

1985-07-18

1987-08-04

DeMeo, Palmer C.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315223, 315226, 315210, 315239, 315287, 315DIG7, 363 78, 363 97, H05B 4124

Patent

active

046848517

ABSTRACT:
A DC/AC converter (30 to 72) for feeding a low-pressure mercury vapor discharge tube (15) comprises two series-connected main transistors (11 and 20) which, in the operating condition, are alternately conducting. The conduction times of the two transistors (11 and 20) are always kept equal to each other by means of an auxiliary circuit (70 to 72, 32a, 32b, 32c) which influences the operation of a timing circuit (32, 33). This prevents the occurrence cataphoresis in the lamp.

REFERENCES:
patent: 4375608 (1983-03-01), Kohler
patent: 4388561 (1983-06-01), Koshimura et al.
patent: 4388565 (1983-06-01), Rividi
patent: 4525648 (1985-06-01), De Bijl et al.
patent: 4544862 (1985-10-01), Yamazaki et al.
patent: 4572988 (1986-02-01), Handler et al.

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