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

1992-09-01

1993-11-16

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315224, 315225, 315307, 315127, 315DIG4, 315DIG5, 315DIG7, 363132, H05B 3702

Patent

active

052626997

ABSTRACT:
A circuit for starting and operating a discharge lamp, such as a compact fluorescent lamp, at high frequency from a 60 Hz AC supply. The circuit includes a DC power supply coupled to a pair of AC input terminals for generating a DC voltage. An oscillator coupled to the DC power supply includes a pair of semiconductor transistors and a drive transformer having a primary winding and at least one secondary winding. A load coupled to the output of the oscillator comprises a series combination of the primary winding of the drive transformer and a tank circuit including a tank inductor and a tank capacitor. Suitable means for connecting a discharge lamp in parallel with the tank capacitor is provided. An oscillator sensing and controlling circuit responsive to various lamp failure modes is coupled to the secondary winding of the transformer and reduces the output of the oscillator after a predetermined time delay by shunting the base of either one of the semiconductor switches of the oscillator. Upon replacement of the failed lamp, normal operation of the oscillator is resumed without having to disconnect the AC supply.

REFERENCES:
patent: 4503363 (1985-03-01), Nilssen
patent: 4553070 (1985-11-01), Sairanen
patent: 4554487 (1985-11-01), Nilssen
patent: 4644228 (1987-02-01), Nilssen
patent: 4675576 (1987-06-01), Nilssen
patent: 4961027 (1990-10-01), Mussli
patent: 5051661 (1991-09-01), Lee

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