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Method and apparatus for stabilizing voltage of intermediate circuit of frequency converter

  • US 7,944,087 B2
  • Filed: 08/18/2008
  • Issued: 05/17/2011
  • Est. Priority Date: 08/24/2007
  • Status: Expired due to Fees
First Claim
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1. A method of damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network, the method comprisingdetermining magnitude (Uc) of voltage of the voltage intermediate circuit,determining magnitude (Uin) of rectified voltage of the supply network,forming a derivative of a difference (Uin

  • Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit,delaying firing of controllable components of the rectifier bridge on the basis of the formed derivative.

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