Circuit arrangement for operating low-pressure discharge lamps

Details Circuit arrangement for operating low-pressure discharge lamps Circuit arrangement for operating low-pressure discharge lamps

1999-04-02

2000-08-15

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315224, 315244, H05B 3702

Patent

active

061041424

ABSTRACT:
In the circuit arrangement for the high-frequency operation of a low-power ow-pressure discharge lamp (LP) having a mains rectifier (2) and a half-bridge circuit, a diode (D1) is connected in series and in the DC non-conducting direction in the connecting line between the second electrode (E2) of the lamp (LP) and the positive or negative pole of the rectifier (2). Moreover, the tap (M2) between the diode (D1) and the second electrode (E2) is connected to the other pole of the mains rectifier (2) via a capacitor (C1), and a resistor (R9) is connected in parallel with the diode (D1). The circuit thus created acts as a passive harmonic filter which fulfills for the circuit arrangement the IEC regulations of class D with reference to line current harmonic content.

REFERENCES:
patent: 4808887 (1989-02-01), Fahnrich et al.
patent: 5574336 (1996-11-01), Konopka et al.
patent: 5583399 (1996-12-01), Rudolph
patent: 5610479 (1997-03-01), Schmitt
patent: 5677601 (1997-10-01), Zuchtriegel
patent: 5801492 (1998-09-01), Bobel
patent: 5898278 (1999-04-01), Muessli
patent: 5994847 (1999-11-01), Konopka

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