Gas discharge lamp employing a pulse generator with a double sta

Details Gas discharge lamp employing a pulse generator with a double sta Gas discharge lamp employing a pulse generator with a double sta

1979-07-18

1981-06-30

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge device and/or rectifier in the primary circuit of...

315205, 315209R, 315276, 315DIG2, 315DIG5, H05B 3700, H05B 3900, H05B 4114

Patent

active

042764963

ABSTRACT:
A solid state ballast circuit for a discharge lamp includes a transistor oscillator with a current amplifier connected to a transformer one secondary winding of which is connected to the lamp and another secondary winding of which is coupled to the amplifier input. An inductive choke coil is connected in the power circuit of the amplifier so that when the lamp burns out or is removed the operating frequency increase resulting from the decrease in load circuit capacitance results in an increase in impedance of the choke, drastically reducing current flow through the amplifier power circuit to prevent transistor damage or RF interference radiation. The current amplifier disclosed is a two-stage emitter follower circuit.

REFERENCES:
patent: 3683266 (1972-08-01), Ito
patent: 3710177 (1973-01-01), Ward
patent: 3758841 (1973-09-01), Bourbeau
patent: 3889153 (1975-06-01), Pierce
patent: 3922582 (1975-11-01), Pitel
patent: 4045711 (1977-08-01), Pitel
patent: 4060758 (1977-11-01), Wright
patent: 4127795 (1978-11-01), Knoll
patent: 4127798 (1978-11-01), Anderson

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