| 摘要 |
<p>The present invention provides a direct current power source device which can make an input current wave form be close a sine wave and thus can easily satisfy the limit of harmonic wave. The direct current power source device includes a control circuit (Z2) as an LED lighting device (10), which converts rectified current input voltages (Vin) into direct current voltages to provide the direct current voltages to an LED load (RL) by controlling a switching device (M1), connected to an reactor (L1) in series, to be on and off. The control circuit (Z2) is floated, with respect to a ground line (GND1) after rectification, to operate, and controls an on-piece of a switching device (M1) based on the current value flowing on the reactor (L1) and the LED load (RL). The control circuit board (Z2) includes an oscillation circuit which controls a switching frequency of an on/off control in an unsynchronized way with respect to an energy discharging timing of the reactor (L1).</p> |
