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Method for measuring phase currents in an inverter

  • US 5,969,958 A
  • Filed: 10/14/1997
  • Issued: 10/19/1999
  • Est. Priority Date: 01/23/1995
  • Status: Expired due to Term
First Claim
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1. A method for measuring phase currents in an inverter whereby pulse width modulation controlled semiconductor switches invert direct voltage from an intermediate circuit into a three-phase alternating voltage, and where the phase currents are measured by measuring intermediate circuit current of the intermediate circuit when an active switch state creates an unambiguous relation between the intermediate circuit current and a phase current, the method comprising the further steps of measuring the value of the intermediate circuit current in two separate settings of the same active switch state in a modulation period (Tm), and creating a resulting mean value of the measured values.

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