| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a light emitting diode (LED) driving circuit which uses a control unit to detect a driving current of an LED, and controls a corresponding switching circuit so as to precisely control the driving current of the LED. <P>SOLUTION: The 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 prescribed frequency to turn on or turn off the switching element, wherein a first resistor is positioned 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 terminal connected to the power contact of the control unit and a second terminal connected to a ground contact; and an inductor having a first terminal connected to the ground contact and the second terminal connected to the second terminal of the capacitor, wherein the second terminal is connected to the light emitting diode. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
