Light-emitting diode lighting circuit

Details Light-emitting diode lighting circuit Light-emitting diode lighting circuit

2006-03-07

2006-03-07

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S029010

Reexamination Certificate

active

07010007

ABSTRACT:
A lighting circuit including a circuit for preventing erroneous illumination of LEDs wherein the lighting circuit, serving as a drive circuit for the LEDs, includes a transistor and a differential amplifier placed at a preceding stage of the transistor. A positive input side of the differential amplifier is connected to a battery through a switch and to a reference resistor Rref. A voltage of the battery is divided by resistors R1and R2and supplied to a negative input side of the differential amplifier. A resistance value (R1/R2)×Rref is set to be smaller than a leakage resistance value Rs of the switch. Thus, the differential amplifier is not turned on when the switch is opened even though there is a leakage at the switch. Therefore, the transistor is not turned on, and the LEDs are not illuminated.

REFERENCES:
patent: 4030398 (1977-06-01), Dittmar
patent: 5193108 (1993-03-01), Stocklin
patent: 5706060 (1998-01-01), Ruitenburg
patent: 5802089 (1998-09-01), Link
patent: 5970078 (1999-10-01), Walker
patent: 6051895 (2000-04-01), Mercier
patent: 2002/0105373 (2002-08-01), Sudo
patent: 1-123483 (1989-05-01), None

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