Reduced duty cycle high intensity discharge lamp ignitor

Details Reduced duty cycle high intensity discharge lamp ignitor Reduced duty cycle high intensity discharge lamp ignitor

1997-05-15

1999-03-23

Pascal, Robert

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315309, H05B 4114

Patent

active

058864814

ABSTRACT:
A reduced cycle ignitor circuit for a high intensity discharge lamp incorporating a thermally timed, cycled operation which provides intermittent starting pulses for the high intensity discharge lamp. The ignitor circuit comprises a capacitor and semiconductor connected in series with a ballast transformer. The ignitor circuit further comprises a series connected resistor and thermostat, having thermally operated, normally closed electrical contacts, through which current is conducted to charge the capacitor. The thermostat is thermally coupled to the resistor. During operation, current flows through the series connected resistor and thermostat and charges the capacitor to a breakover threshold voltage level of the semiconductor. At that point, the semiconductor conducts and the energy stored in the capacitor is discharged through the semiconductor and a winding of the ballast which, through auto-transformer action, generates a high voltage pulse to start the high intensity discharge lamp. The resistor heats the thermostat during the charging cycle which reaches a temperature at which the normally closed thermostat contacts open, which disables the ignitor circuit until the resistor and thermostat cool and the thermostat contacts close.

REFERENCES:
patent: 4097838 (1978-06-01), Fiala
patent: 5019751 (1991-05-01), Flory, IV et al.
patent: 5210471 (1993-05-01), Nuckolls et al.
patent: 5594308 (1997-01-01), Nuckolls et al.

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