Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1997-02-28
1998-11-17
Kinkead, Arnold
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315201R, 315226, 315225, 315243, 315308, 327589, 363 24, 363134, H05B 3702
Patent
active
058381171
ABSTRACT:
Disclosed is a ballast circuit for a gas discharge lamp comprising a resonant load circuit incorporating the gas discharge lamp, a resonant inductance, and a resonant capacitance. A d.c.-to-a.c. converter circuit induces an a.c. current in the load circuit, and comprises first and second converter switches serially connected in the foregoing order between a bus conductor at a d.c. voltage and a reference conductor. The switches are connected together at a common node through which the a.c. load current flows. The switches each have a control node and a reference node, the voltage between such nodes determining the conduction state of the associated switch. The respective control nodes of the switches are interconnected, and the respective reference nodes of the switches are connected together at the common node. A bridge network, connected between first and second nodes, has first and second input nodes on which respective first and second input signals are applied, and first and second output nodes respectively connected to the common and control nodes so as to control the switching state of the switches. An oscillator provides the first and second input signals, and has a timing input. A first resistor and a serially connected feedback winding are coupled to the timing input. The feedback winding is coupled to the resonant inductance so as to increase oscillator frequency when current in the resonant inductance from the common node lags the voltage between the common node and the reference conductor, and to decrease the frequency when the current leads the voltage.
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Bruzga Charles E.
General Electric Company
Kinkead Arnold
LandOfFree
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