Semiconductor circuit for driving light emitting diode, and...

Details Semiconductor circuit for driving light emitting diode, and... Semiconductor circuit for driving light emitting diode, and...

2005-12-14

2010-11-09

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315S307000

Reexamination Certificate

active

07830097

ABSTRACT:
A light emitting diode drives a semiconductor circuit in order to drive a light emitting diode that emits light by applying the output voltage of the rectifier circuit. The light emitting diode includes a switching element connected between the light emitting diode and the ground potential. An input voltage detection circuit detects the output voltage of the rectifier circuit to output a light emitting signal or a extinction signal. A current detection circuit detects the current flowing into the switching element. A control circuit intermittently controls on/off of the switching element at a predetermined oscillating frequency based on the output signal of the current detection circuit while the input voltage detection circuit is outputting the light emitting signal.

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International Search Report for Application No. PCT/JP2005/022952, dated Mar. 28, 2006.

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