Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1981-06-29
1983-06-28
La Roche, Eugene
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315276, 315278, 336178, 323215, 323362, H05B 4124, H01F 1706, H01F 1904
Patent
active
043908136
ABSTRACT:
In an electrodeless discharge lamp of the type including an ionizable medium within a sealed envelope capable of emitting radiant energy when subjected to a radio frequency field, an oscillator for generating an output signal at a given radio frequency, a Class D RF amplifier including first and second transistors responsive to the oscillator output signal, and an induction coil responsive to the output of the amplifier, the coil being 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, there is disclosed an improved transformer for driving the Class D amplifier which results in a significant decrease in power consumption. The oscillator output signal is connected to the primary winding of a transformer which includes a toroidal, magnetic core. The transistors of the RF amplifier are connected to secondary windings wound on the core. The core is split between the secondary windings to form a high reluctance path which isolates the secondary windings from each other and critically couples the primary winding and the secondary windings.
REFERENCES:
patent: 3230488 (1966-01-01), Jacob
DeLuca Vincent
Hinderstein Philip M.
La Roche Eugene
Litek International Inc.
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