LED driving semiconductor circuit and LED driving apparatus...

Details LED driving semiconductor circuit and LED driving apparatus... LED driving semiconductor circuit and LED driving apparatus...

2006-10-03

2006-10-03

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Solid state light source

C327S109000, C315S291000, C345S046000

Reexamination Certificate

active

07115888

ABSTRACT:
A LED driving semiconductor circuit of the present invention includes a first input terminal connected to a light-emitting diode, a switching device block having a first FET and a first switching device, a reference voltage terminal which is connected to the first FET and outputs the reference voltage, a start/stop circuit which outputs a start signal when the reference voltage is equal to or larger than a predetermined value and outputs a stop signal when the reference voltage is less than the predetermined value, a current detection circuit which detects the current flowing through the first switching device, and a control circuit which controls ON/OFF of the first switching device intermittently at the predetermined frequency based on the output signal of the start/stop circuit and the output signal of the current detection circuit so that the constant current flows through the light-emitting diode.

REFERENCES:
patent: 5329210 (1994-07-01), Peterson et al.
patent: 5381018 (1995-01-01), Mojaradi et al.
patent: 2004/0041526 (2004-03-01), Vollrath
patent: 197 32 828 (1999-02-01), None
patent: 102 30 103 (2004-01-01), None
patent: 2001-8443 (2001-01-01), None
patent: 2001-313423 (2001-11-01), None
patent: 2004/057921 (2004-07-01), None

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