Driving circuit for light emitting element

Details Driving circuit for light emitting element Driving circuit for light emitting element

1996-08-29

1998-08-11

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

3151693, 315226, 315291, 345 76, G09G 310

Patent

active

057931631

ABSTRACT:
In a circuit for driving a light emitting element, a switched capacitor circuit including a capacitor is connected between a power supply and the light emitting element. The capacitor in the switched capacitor circuit is charged to a power supply voltage when switches are exchanged to the sides of charging. The power supply is connected in series with the capacitor when the switches in the switched capacitor circuit are exchanged to the side of discharging. The power supply and capacitor connected in series therewith supplies the driving current to the light emitting element. Changing the number of times of exchange of the switches permits the driving current to flow into the light emitting element to be varied. Thus, the circuit for driving a light emitting element with excellent power-supply efficiency is provided which can drive a light-emitting element even when the power supply voltage for driving the light emitting element is lower than the forward voltage thereof.

REFERENCES:
patent: 3209229 (1965-09-01), Cox, Jr.
patent: 4291369 (1981-09-01), Hochstrate
patent: 4642524 (1987-02-01), Eaton et al.
patent: 4654649 (1987-03-01), Kojima et al.
patent: 4692665 (1987-09-01), Sakuma
patent: 5075596 (1991-12-01), Young et al.
patent: 5309150 (1994-05-01), Ohba et al.
patent: 5442260 (1995-08-01), Saito et al.
Electronic Design, vol. 42, No. 5, Mar. 7, 1994, p. 75 XP000443796; Belousov A L: "Inductor-Less LED Booster".

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