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DC power-supply device and refrigeration-cycle application device including the same

  • US 9,960,703 B2
  • Filed: 09/06/2013
  • Issued: 05/01/2018
  • Est. Priority Date: 09/06/2013
  • Status: Active Grant
First Claim
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1. A DC power-supply device that converts an alternating current into a direct current and supplies the direct current to a load, comprising:

  • a rectifier circuit to rectify the alternating current;

    a reactor connected to an input side or an output side of the rectifier circuit;

    a first capacitor and a second capacitor serially connected between output terminals to the load;

    a charging unit to selectively charge one or both of the first capacitor and the second capacitor;

    a first voltage detection unit to detect a voltage of the first capacitor;

    a second voltage detection unit to detect a voltage of the second capacitor; and

    a control unit to control the charging unit, wherein;

    the control unit controls at least one of a charging period of the first capacitor and a charging period of the second capacitor,by changing at least of one of the charging period of the first capacitor and the charging period of the second capacitor with respect to a voltage difference between the first capacitor and the second capacitor at a first time, a voltage difference between the first capacitor and the second capacitor at a second time, which is after the first time, is made small,the alternating current is a three-phase alternating current,the control unit controls the charging unit in such a manner that, when a period obtained by combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor is designated as one cycle, a charging frequency becomes 3n times (n is a natural number) higher than a frequency of the three-phase alternating current, andthe charging frequency is an inverse number of the one cycle.

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