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Frequency converter, procedure for controlling it and motor control using a frequency converter

  • US 5,523,937 A
  • Filed: 12/14/1993
  • Issued: 06/04/1996
  • Est. Priority Date: 12/22/1992
  • Status: Expired due to Fees
First Claim
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1. A method for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude using a first bridge having a plurality of branches and a plurality of first switches, each branch having at least one first switch, a second bridge having a plurality of second switches, and a resonant circuit connected between the bridges, the method comprising the step of:

  • (a) connecting the first alternating voltage across the resonant circuit via at least two first switches of the first bridge for a first period substantially equal to half the cycle of the characteristic frequency of the resonant circuit formed, the at least two first switches being in different branches of the first bridge; and

    (b) connecting the resonant circuit across the second alternating voltage via at least two of the second switches of the second bridge for a second period substantially equal to half the cycle of the characteristic frequency of the resonant circuit formed.

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