Circuit arrangement for preventing high peak currents

Details Circuit arrangement for preventing high peak currents Circuit arrangement for preventing high peak currents

2008-07-08

2008-07-08

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S225000, C315S247000, C315S274000, C315S2090SC

Reexamination Certificate

active

07397196

ABSTRACT:
A driver for HID lamps includes four switches and generates a constant DC-current that is commutated at a low frequency. The driver includes a filter capacitor. The occurrence of peak currents due to the charging or discharging of the filter capacitor is prevented by driving one of the switches at a high frequency immediately after commutation.

REFERENCES:
patent: 4912374 (1990-03-01), Nagase et al.
patent: 5434479 (1995-07-01), Ohnishi et al.
patent: 5594635 (1997-01-01), Gegner
patent: 6426597 (2002-07-01), Rast et al.
patent: 6646392 (2003-11-01), Kpenv
patent: 2004/0189215 (2004-09-01), Chen
patent: 2007/0047612 (2007-03-01), Keough

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