Ballast circuit with a japped transformer flyback converter prov

Details Ballast circuit with a japped transformer flyback converter prov Ballast circuit with a japped transformer flyback converter prov

1996-02-15

1997-06-03

Pascal, Robert

Electric lamp and discharge devices: systems

Plural power supplies

Diverse-type current supplies

315DIG5, 315307, 315171, 315205, 315277, 315282, 315200R, H05B 3700

Patent

active

056358008

ABSTRACT:
Circuit arrangements generate start, glow, and/or run signals to be applied to and for operating a DC arc discharge lamp. A first circuit arrangement provides start, glow, and run signals. The first circuit arrangement includes a tapped transformer flyback converter circuit for combining the start and glow functions; a buck/boost converter for providing the run function; and blocking diodes for providing a blocking function for the glow circuit during the start and run modes, and further for providing a blocking function for the run circuit during the start and glow modes. A second circuit arrangement provides start and glow functions, and includes a tapped transformer flyback converter circuit for combining the start and glow functions; and a blocking diode for providing a blocking function for the glow circuit during the start mode. A third circuit arrangement includes a buck/boost converter for providing glow and run functions, and further includes an inductive storage element, such as an inductor. A fourth circuit arrangement includes a single buck/boost converter for providing start, glow, and run signals, and further includes an inductive storage element, such as an inductor. In all of the circuit arrangements, a switching device controls energy transferred through the inductive storage element, which is either a tapped transformer or an inductor. A measurement and control circuit measures a voltage and provides a control signal in response thereto, for controlling the switching device.

REFERENCES:
patent: 4550272 (1985-10-01), Kimura et al.
patent: 4749913 (1988-06-01), Stuermer et al.
patent: 5144204 (1992-09-01), Nerone et al.

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