Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1993-03-26
1995-07-25
Wolfe, Willis R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315246, 315276, 315291, H05B 4120
Patent
active
054365325
ABSTRACT:
Power is provided to a fluorescent lamp by connecting a source of alternating electrical current, consisting of a series of alternately positive and negative current pulses, to the lamp and shaping the current pulses such that the absolute value of the current increases as a function of time within each pulse. The shaped current source may be provided by a switched mode drive circuit, including a power transformer having a primary winding and a secondary winding, the power transformer secondary winding being connected to the lamp; a flyback transformer having a primary winding and a secondary winding, a first terminal of the flyback transformer primary winding being connected to the center of the power transformer primary winding and a second terminal of the flyback transformer primary winding being connected to a positive terminal of a source of direct current electrical power; a first switch connected between a first terminal of the power transformer primary winding and a negative terminal of the power source; a second switch connected between a second terminal of the power transformer primary winding and the negative terminal of the power source; a diode connected between a first terminal of the flyback transformer secondary winding and the second terminal of the flyback transformer primary winding, such that current is limited to flowing from the secondary winding to the primary winding of the flyback transformer; and a capacitor connected between the first and second terminals of the power source. A digital control circuit may be coupled to the first and second switches to open and close the switches in a time sequenced pattern, thereby causing the current pulses to be shaped such that the absolute value of the current increases as a function of time within each pulse.
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Davenport, et al., "Current Interrupt System", Journal of the Illuminating Engineering Society, vol. 18, pp. 3-8, Jan. 1989.
Beat David F.
Benard David J.
Deinken John J.
Rockwell International Corporation
Wolfe Willis R.
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