Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1991-08-26
1992-08-25
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315219, 315DIG5, 315DIG7, 315307, 315119, 363 56, H05B 3702, H05B 3904, H05B 4136
Patent
active
051422026
ABSTRACT:
A circuit for starting and operating a discharge lamp, such as a compact fluorescent lamp, at high frequency from an 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 drive transformers having a primary 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. A voltage sensing circuit responsive to failure of the lamp, is coupled to an oscillator controlling circuit which reduces the output of the oscillator after a predetermined time delay by shunting the drive transformer. 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), Muessli
patent: 5051661 (1991-09-01), Lee
Nguyen Long T.
Sun Yiyoung
Bessone Carlos S.
GTE Products Corporation
LaRoche Eugene R.
Shingleton Michael B.
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