Device and method for capacitive bi-level switching of high inte

Details Device and method for capacitive bi-level switching of high inte Device and method for capacitive bi-level switching of high inte

1998-07-31

2000-02-29

Vu, David H.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Arc machining

315240, 315DIG4, H05B 3702

Patent

active

060313404

ABSTRACT:
A zero current crossing capacitive switching scheme for controlling the switching of a capacitor into and out of an HID lead ballast circuit at a time when a current through the capacitor is at or near zero. The capacitor switching enabling bi-level operation of an HID lamp such that the HID lamp operates at full power mode or in a reduced power mode. The zero current crossing is achieved by delaying the capacitor switching, a duration equal to about 5.degree. to 10.degree. lag from the zero volt crossing. The device can be used in a method of controlling a plurality of HID lamps using an isolated class 2 wiring scheme. Potential damage to the HID lamp caused by aborted lamp ignitions is also disclosed. The method includes suppressing off input signals during the warm up period.

REFERENCES:
patent: 4931701 (1990-06-01), Carl
patent: 5227762 (1993-07-01), Guidette et al.
patent: 5327048 (1994-07-01), Troy
patent: 5451843 (1995-09-01), Kahn et al.
patent: 5475360 (1995-12-01), Guidette et al.

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