| 摘要 |
PROBLEM TO BE SOLVED: To control a plurality of DC-DC converters each in the optimal state according to a change in load while protecting DC-DC converters having a small power capacity in the configuration wherein the plurality of DC-DC converters having different power capacities are connected in parallel. SOLUTION: A DC power supply includes: a plurality of DC-DC converters 11, 12 having a different allowable power that are connected in parallel; switching elements 13, 14 and rectifier elements 15, 16 that are connected in series to the outputs of the DC-DC converters 11, 12, respectively; an integrating circuit 17 for smoothing the outputs of the rectifier elements 15, 16; and a control unit 20 for controlling each of the DC-DC converters 11, 12 by driving the switching elements 13, 14 individually. The control unit 20 controls each DC-DC converter by setting an on-duty ratio of the switching elements 13, 14 of the DC-DC converters 11, 12 individually so that the output of each of the DC-DC converters 11, 12 does not exceed their respective allowable power. COPYRIGHT: (C)2011,JPO&INPIT
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