Starting and operating circuit for ARC discharge lamp

Details Starting and operating circuit for ARC discharge lamp Starting and operating circuit for ARC discharge lamp

1993-09-30

1995-02-21

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315 82, 315DIG7, H05B 3700

Patent

active

053919661

ABSTRACT:
A circuit for starting and operating a high intensity discharge (HID) lamp in a dc mode includes a dc-to-dc converter coupled to a pair of direct current input terminals. The dc-to-dc converter includes a semiconductor switch, a power transformer, input and output capacitors and a diode rectifier. A pulse width modulator is coupled to the dc-to-dc converter and includes a high frequency generator for developing a signal for driving the semiconductor switch of the dc-to-dc converter. A reverse recovery circuit coupled to the diode rectifier of the dc-to-dc converter reduces heat losses, eliminates noise and also returns energy to the input of the dc-to-dc converter. The starting and operating circuit further includes voltage and current sensing circuits coupled to a power control summing amplifier. The output of the power control summing amplifier is coupled to the pulse width modulator so as to control the power delivered to the lamp. A warm-up power control circuit allows operation of the lamp at an elevated power level for a predetermined period of time during start-up of the lamp. Also, the warm-up power control circuit includes circuitry for tracking the amount of time the lamp is off and for adjusting the initial lamp power to a hot lamp to a predetermined level.

REFERENCES:
patent: 5036256 (1991-07-01), Garrison et al.
patent: 5051665 (1991-09-01), Garrison et al.
patent: 5142203 (1992-08-01), Oda et al.
patent: 5151631 (1992-09-01), Oda et al.

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