Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1984-05-15
1985-10-08
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315287, 315302, H05B 3702
Patent
active
045462909
ABSTRACT:
A high frequency ballast circuit for a discharge lamp particularly of the so-called energy saving type adapted to fit into conventional incandescent lamp sockets. The circuit comprises an inductive choke and a transistor switching device connected in series with the lamp and a rectified source of AC supply. The transistor is switched with a high frequency, preferably asymmetrically square, waveform and a diode having a direction of conduction opposite to that of the transistor is connected in shunt across the series-connected choke and lamp. The circuit enables lightweight air core coils to be used for the inductive choke facilitating integral combination of the circuit and discharge lamp into a lamp unit having the same general configuration as a conventional incandescent lamp.
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"New Parameters for High Frequency Lighting Systems", by John H. Campbell, Illuminating Engineering, May 1960, p. 247.
Dixon Harold
Egyesult Izzolampa es Villamossagi Rt.
Katona Gabriel P.
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