Abstract: An electronic power supply for use with a gas discharge lamp, including a transformer having its primary winding connected in parallel with a capacitor of a series resonant element connected between an inverter and the lamp, effective to limit the voltage from the power supply to a predetermined level.
Abstract: An electronic ballast circuit for multiple fluorescent lamps. Control is achieved by varying the voltage and the frequency of operation of an inverter utilized to drive the fluorescent lamps. A separate voltage boost converter provides regulated voltage to the converter. Dimming is accomplished by varying the voltage either manually or in response to sensor circuitry.
Abstract: An interface circuit used between a telephone office and a subscriber's telephone operated in response to signals identifying incoming calls to provide visual and/or audible indications of the identification information. The incoming signal information is also extended in decoded form to an associated computer, computer network, and/or television screen.
January 25, 1993
Date of Patent:
September 20, 1994
Satyan G. Pitroda, Krishnappa Ranganath