| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED lighting device having a switching power supply circuit, capable of achieving a configuration by which a high input power factor can be obtained over a wide input current range, and thereby, to provide a standard power supply that matches various types of LED illuminating fixtures.SOLUTION: An LED lighting device 1 comprises: a rectification circuit 3 rectifying an AC input current; a first capacitor 4 in which an output of the rectification circuit is charged; a switching power supply circuit 5 converting a voltage of the first capacitor into a predetermined DC output, and applying it to an LED array; and a capacitor switching circuit 6. The capacitor switching circuit comprises: an input current detector detecting the AC input current; a switch part that becomes in a conduction state when an AC input current value detected at the input current detector becomes larger than a predetermined value; and a second capacitor 67 connected in series to the switch part. A series circuit of the switch part and the second capacitor is connected in parallel with the first capacitor. |
