Circuit containing symetrically-driven coil for energizing elect

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load

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315344, H05B 4124

Patent

active

052006727

ABSTRACT:
An arrangement including an electrodeless discharge lamp having a sealed envelope enclosing an ionizable medium capable of emitting radiant energy when subjected to a radio frequency field and a circuit for operating the lamp. The circuit includes an oscillator for generating an output signal at a given radio frequency, an RF amplifier responsive to the oscillator output signal, and an output tank circuit including an induction coil and a capacitor connected in parallel. The RF amplifier includes a pair of semiconductor switches operating in a Class E mode. The induction coil is positioned in close physical proximity to the medium in the envelope for coupling to the medium an electric field having a magnitude sufficient to initiate ionization of the medium and a magnetic field for maintaining the ionization. In a preferred embodiment, the amount of EMI/RFI noise generated in the circuit is reduced by symmetrically driving the induction coil.

REFERENCES:
patent: 4048541 (1977-09-01), Adams et al.
patent: 4245178 (1981-01-01), Justice
patent: 4383203 (1983-05-01), Stanley
patent: 4631449 (1986-12-01), Peters
patent: 4748383 (1988-05-01), Houkes
patent: 4748634 (1988-05-01), Hesterman
patent: 4877999 (1989-10-01), Knapp

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