| 摘要 |
<p>The invention provides a power supply device capable of widening a conduction period of an input current by a simple control to improve power factor, and reduce a harmonic distortion of the input current. The power supply device comprises a rectifier circuit (2), a reactor (3), a power factor correction circuit (7) having switching elements (4a, 4b), capacitors (5a, 5b) and reverse-current blocking rectifier elements (6a, 6b), a smoothing capacitor (8) for smoothing an output voltage of the power factor correction circuit (7) to obtain a DC voltage, a pulse signal controller (22) generating and outputting a pulse signal for turning on and off the switching elements (4), and a driver (23) for receiving the pulse signal to drive the switching elements (4) of the power factor correction circuit (7). <IMAGE></p> |
