Apparatus and method for sustaining the operation of HID lamps

Details Apparatus and method for sustaining the operation of HID lamps Apparatus and method for sustaining the operation of HID lamps

1976-05-10

1977-11-08

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

307 23, 307 27, 307 73, 315174, H05B 4114, H05B 4126

Patent

active

040577503

ABSTRACT:
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 extinguishing.

REFERENCES:
patent: 3657597 (1972-04-01), Moerkens et al.

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