Lamp circuit limited to a booster in which the power output decr

Details Lamp circuit limited to a booster in which the power output decr Lamp circuit limited to a booster in which the power output decr

1994-06-29

1995-12-12

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315308, 315247, 315219, 315DIG7, 315DIG4, 315DIG5, H05B 3702

Patent

active

054752850

ABSTRACT:
A power supply circuit (100) for use in driving fluorescent lamps (102, 104, 106) has a current mode control voltage boost IC (144) which produces a boosted voltage and has a power control input (pin 3) and a frequency control input (pin 4). The lamps are driven by a self oscillating inverter (178, 180, 196, 198) which is powered from the voltage boost IC and which operates at a frequency independent therefrom. In order to dim the lamps a D.C. bias voltage is applied to the power control input. At the same time a commensurate D.C. bias voltage is applied to the frequency control input so as to provide power factor correction in dependence on the power produced by the voltage boost IC. The circuit thus provides a substantially constant, optimum power factor at both full and dimmed light levels.

REFERENCES:
patent: 4949016 (1990-08-01), De Bijl et al.
patent: 5049790 (1991-09-01), Herfurth et al.
patent: 5107184 (1992-04-01), Hu et al.
patent: 5140229 (1992-08-01), Yagi et al.
patent: 5142203 (1992-08-01), Oda et al.
patent: 5144195 (1992-09-01), Konopka et al.
patent: 5185560 (1993-02-01), Nilssen
patent: 5293099 (1994-03-01), Bobel

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