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Motor controller incorporating an electronic circuit for protection against inrush currents

  • US 7,050,278 B2
  • Filed: 05/21/2003
  • Issued: 05/23/2006
  • Est. Priority Date: 05/22/2002
  • Status: Expired due to Fees
First Claim
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1. An electronic circuit for protection against inrush currents, the circuit comprising:

  • an inrush resistor;

    a switch, which is controlled by a controller; and

    a noise-decoupling capacitor which diverts noise currents to earth;

    wherein the circuit is arranged in a DC intermediate circuit and inserted in series with an intermediate capacitor, the inrush resistor having the form of a resistor network connected to the switch, and wherein the controller via the switch alters the resistance of the resistor network, so that when the switch is open, the resistance to a differential current is greater than the resistance to a common mode current, and when the switch is closed, there is greater resistance to a common mode current than to the differential current.

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