Light-emitting diode driving circuit

Details Light-emitting diode driving circuit Light-emitting diode driving circuit

2011-03-29

2011-03-29

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC

Reexamination Certificate

active

07915836

ABSTRACT:
A light-emitting diode driving circuit includes an AC/DC converting circuit for converting an AC power source into a DC power source; a switching element having an input contact connected to the AC/DC converting circuit; a control unit for outputting a control signal to the switching element at a set frequency to turn on or turn off the switching element, wherein a first resistor is disposed between a power contact thereof and the input contact of the switching element; a second resistor for enabling the control unit to detect a half-cycle voltage of the DC power source; a capacitor having a first end connected to the power contact, and a second end connected to a ground contact of the control unit; and an inductor having a first end connected to the ground contact and the second end of the capacitor, and a second end connected to a light-emitting diode.

REFERENCES:
patent: 6320330 (2001-11-01), Haavisto et al.
patent: 7015654 (2006-03-01), Kuhlmann et al.
patent: 7323828 (2008-01-01), Russell et al.
patent: 7439945 (2008-10-01), Awalt et al.
patent: 553672 (2003-05-01), None

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