Switching arrangement for high pressure discharge lamp

Details Switching arrangement for high pressure discharge lamp Switching arrangement for high pressure discharge lamp

1990-05-11

1992-02-11

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315307, 315DIG7, H05B 4136

Patent

active

050878590

ABSTRACT:
The invention relates to a switching arrangement suitable for ignition and operation of a high-pressure discharge lamp by means of a plulsatory current of changing polarity. For this purpose, the switching arrangement is provided with a bridge network (II), which includes a switching means (21) switched alternately to the conducting and the non-conducting state. The switching means is provided with a control electrode (215) and a main electrode (211), between which a shortcircuit is maintained by means of a shortcircuit switch (27) for the time in which the switching means is in the non-conducting state. According to the invention, the shortcircuit switch is controlled by means of a controlled current source (28).

REFERENCES:
patent: 3949267 (1976-04-01), Collins
patent: 4400651 (1983-08-01), Nelle
patent: 4471269 (1984-09-01), Ganser et al.
patent: 4485434 (1984-11-01), Beeston et al.
patent: 4649321 (1987-03-01), Ferraro
patent: 4677346 (1987-06-01), Roberts et al.
patent: 4763239 (1988-08-01), Ball
patent: 4939381 (1990-07-01), Shibata et al.

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