| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an LED lighting device capable of obtaining a light output equivalent to that at the time of lighting up with DC smooth voltage while reducing high harmonic components of input current. <P>SOLUTION: The LED lighting device includes a full-wave rectifier DB for performing full-wave rectification of a commercial AC power source Vs, a first capacitor C1 connected in parallel with an output terminal of the full-wave rectifier DB, a switching power source circuit 1 whose input terminal is connected with the first capacitor C1 in parallel, a LED light-emitting section 2 connected to an output terminal of the switching power source circuit 1, and a second capacitor C2 connected in parallel to the LED light-emitting section 2. The capacitance of the first capacitor C1 is less than 1μF, and the second capacitor C2 is set to have a capacitance with which a ripple factor of current flowing in the LED light-emitting section 2 becomes less than one. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
