Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1993-04-20
1995-01-17
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315209R, 315219, 315291, 315224, 315241R, 315244, 315DIG5, 315DIG7, G05F 100
Patent
active
053828828
ABSTRACT:
A power supply circuit for a gas discharge lamp is disclosed. The power supply circuit includes a circuit for providing a d.c. bus voltage on a bus conductor, and a resonant lamp circuit. The resonant lamp circuit includes a gas discharge lamp, a first resonant impedance in series with the gas discharge lamp, and a second resonant impedance substantially in parallel with the gas discharge lamp. The resonant load circuit operates at a resonant frequency determined by the values of the first and second resonant impedances. Further included is a series half-bridge converter for impressing across the resonant load circuit a bidirectional voltage, and thereby inducing a bidirectional current in the resonant load circuit. The converter comprises first and second switches that are serially connected between the bus conductor and a ground conductor, that have a common node coupled to a first end of the resonant load circuit and through which the bidirectional load current flows, and that have respective control terminals for controlling the conduction states of the switches. A circuit is provided for generating a feedback signal representing current in the second resonant impedance. Feedback circuitry, responsive to the feedback signal, provides respective control signals on the control terminals of the first and second switches. The feedback means controls the switching of the switches in such manner as to reduce a phase angle between the bidirectional voltage and the bidirectional current when the feedback signal increases, and vice-versa. Lamp power and lamp current are less subject to variation as the line voltage varies.
REFERENCES:
patent: 4709189 (1987-11-01), Kuchii
patent: 5047690 (1991-09-01), Nilssen
patent: 5134345 (1992-07-01), El-Hamamsy et al.
patent: 5208515 (1993-05-01), Lee
patent: 5233273 (1993-08-01), Waki et al.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Pascal Robert J.
Ratliff Reginald A.
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