| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a DC power supply device for suppressing occurrence of a voltage distortion due to the fluctuation of a primary current. <P>SOLUTION: The DC power supply device includes: a reactor 8 connected to an AC power supply 10; a rectification circuit 1 rectifying an output voltage of the reactor 8 and generating a DC voltage; a PAM circuit 2 having a switch element 2b short-circuiting the AC power supply 10 via the reactor 8 and allowing the switch element 2b to perform a switching operation so that the DC voltage is matched with a target DC voltage; a primary voltage detection circuit 11 detecting a primary voltage supplied from the AC power supply 10; a DC voltage detection circuit 3 detecting the DC voltage; and a control section for estimating a time when a primary current starts to flow to the reactor 8 when the PAM circuit 2 is not controlled to be driven in advance of half of a period for the control on the basis of the primary voltage and the DC voltage in advance of the half of the period for the control, and setting a time within a prescribed allowable period, with reference to the time subsequently to the half of the period from the estimation time, to be OFF time of a PAM drive signal which drive controls the PAM circuit 2. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
