| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a DC power supply device reducing a power loss compared with a conventional device by controlling the number of rectifier units and operating the rectifier units in a high power conversion efficiency when the DC power supply device mounting a plurality of rectifier units for converting AC power into DC power is operated at an inefficient load rate. <P>SOLUTION: This DC power supply device has: a plurality of rectifier units connected in parallel to output terminals for outputting DC power; a wiring breaker arranged between the rectifier units and the AC power supply per rectifier unit; a current sensor for measuring a current value of the DC output power and outputting a measured current value; and an operation unit number control section for obtaining the number of rectifier units at which the loss for converting AC into DC becomes the smallest for each of rectifier units with a current value, and controlling so that the DC power can be outputted from the number of operating rectifier units. The operating number control section makes opening/closing control of the wiring breaker connected to the rectifier units so as to correspond to the number of operating units. <P>COPYRIGHT: (C)2010,JPO&INPIT |
