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Converter circuit having control means with capability to short-circuit converter output

  • US 6,320,772 B1
  • Filed: 05/18/2000
  • Issued: 11/20/2001
  • Est. Priority Date: 05/26/1999
  • Status: Expired due to Term
First Claim
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1. A converter circuit comprising:

  • a reactor connected to an AC power supply;

    a PWM converter circuit connected to the reactor, said PWM converter circuit having a high speed diode, a rectifier diode and a switching element connected in parallel to the rectifier diode;

    an input current detection means for detecting an input current of said PWM converter circuit;

    a DC voltage detection means for detecting an output voltage of said PWM converter circuit;

    a voltage level detection means connected to said AC power supply, said detection means detecting whether or not an input voltage is at a constant level; and

    a control means for measuring a variation period of a detection result of the voltage level detection means to judge a power supply frequency and for controlling said PWM converter circuit based on a judgment result for the power supply frequency, a detection result from said voltage level detection means, an input current detected by said input current detection means, and an output voltage detected by said DC voltage detection means.

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