Switching circuit for operating a discharge lamp with constant p

Details Switching circuit for operating a discharge lamp with constant p Switching circuit for operating a discharge lamp with constant p

1992-04-02

1993-08-10

Mottola, Steven

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, H05B 4136

Patent

active

052352552

ABSTRACT:
A circuit arrangement for operating a discharge lamp with a substantially constant power P.sub.L by means of a switch mode power supply with a variable input current I.sub.o and provided with a periodically switching switching FET for controlling the variable input current by means of a drive signal. The drive signal is generated in a drive circuit (V) and is formed from a signal S1 which is proportional on the one hand to the input current and on the other hand to the lamp voltage V.sub.L and a reference signal. The circuit arrangement also includes a signal generator (IV) for generating the signal S1. The power P.sub.L to a good approximation thereby satisfies the relation

REFERENCES:
patent: 4777409 (1988-10-01), Tracy et al.
patent: 4888524 (1989-12-01), Ganser et al.

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