Apparatus and method for sustaining the operation of hid lamps

H - Electricity – 05 – B

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315/23

H05B 41/26 (2006.01) H05B 41/04 (2006.01)

Patent

CA 1064097

APPARATUS AND METHOD FOR SUSTAINING THE OPERATION OF HID LAMPS ABSTRACT OF THE DISCLOSURE To prevent high-intensity-discharge (HID) lamps from extinguishing for prolonged periods due to a power interruption or an appreciable drop in line voltage, a rectifier-battery combination provides standby power for operating a high-frequency inverter. The output of the inverter connects to the HID lamps through impedance means which passes a greatly reduced high-frequency current as compared to the normal lamp operating current, in order to sustain the operation of the lamps at a very reduced power level. Upon restoration of the normal line voltage, the lamps again operate with normal power consumption. The same wiring can be used for both the normal lamp operating current and the high-frequency sustaining current or separate wiring systems can be used if desired. The high-frequency current can be supplied simultaneously with the normal operating current or the high-frequency current can be supplied only during periods of power interruption. In the latter case, the high-frequency sustaining current is continued for a period of at least 0.1 second after restoration of the normal line voltage to prevent the HID lamps from extinguish ing.

276584

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