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POWER CONVERTING APPARATUS

  • US 20110176343A1
  • Filed: 09/26/2008
  • Published: 07/21/2011
  • Est. Priority Date: 09/26/2008
  • Status: Active Grant
First Claim
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1. A power converter which converts AC power to DC power or vice versa, the power converter comprising:

  • Magnetic Energy Recovery Switch comprising a bridge circuit including four reverse conductive type semiconductor switches and a magnetic energy accumulating capacitor C which accumulates magnetic energy possessed by a current at the time of current cutoff and which is connected between DC terminals DC(P), DC(N) of the bridge circuit, and whereinthe power converter employs a circuit configuration in which an AC power source is connected between AC terminals AC, AC of the bridge circuit through a inductor Lac, and a DC power source or a load is connected between the DC terminals DC(P), DC(N) through a smoothing inductor Ldc, and whereinthe power converter further comprises;

    a gate control device which performs on/off control on the reverse conductive type semiconductor switches by supplying a control signal to a gate of each reverse conductive type semiconductor switch, the gate control device performing controlling in such a way that a pair of the reverse conductive type semiconductor switches on a diagonal line of the bridge is turned on, while at the same time, another pair of the reverse conductive type semiconductor switches is turned off, the gate control device also allowing a pair of the reverse conductive type semiconductor switches selected by a direction of a current from the AC power source to perform high speed on/off operation;

    means for generating a boosted pulse voltage between the DC terminals DC(P), DC(N); and

    means for allowing the boosted pulse voltage to flow in the DC power source, a secondary battery (battery) or the AC load through the smoothing inductor Ldc in order to smooth and convert the boosted pulse voltage to a DC voltage, and whereinthe power converter is connected to a secondary battery (battery) charging device in series or in parallel, or a series connection and a parallel connection is interchanged by an opening/closing switch, the secondary battery charging device controls charging conditions, such as a temperature of the secondary battery (battery) and a charging amount of the secondary battery, in a long term, shifts a power factor of an input current from a lagging power factor to a leading power factor in a short term, and adjusts a current power factor together with a lagging power factor of another power system to reduce the current, thereby reducing Joule loss and compensating voltage variation, overvoltage, and undervoltage at a power receiving point.

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