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Apparatus and method for detecting phase currents of inverter

  • US 7,483,279 B2
  • Filed: 10/17/2006
  • Issued: 01/27/2009
  • Est. Priority Date: 12/30/2005
  • Status: Active Grant
First Claim
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1. An apparatus for detecting phase currents of an inverter, comprising:

  • a switch section for converting a direct current power into an alternating current power and providing the alternating current power to a load as a plurality of upper switching elements and lower switching elements are turned-on according to a plurality of pulse width modulation signals;

    a plurality of current detecting resistors coupled between the plurality of lower switching elements and a ground, respectively;

    a plurality of analog/digital converters for converting voltages of the plurality of current detecting resistors into digital signals;

    a triangular wave generator for generating a triangular wave having a predetermined time period;

    a current detection controller for generating three-phase sine wave voltages, for comparing the generated three-phase sine wave voltage with a reference threshold voltage, and for varying the three-phase sine wave voltage according to the compared result to control a detection of the phase currents;

    a pulse width modulation signal generator for comparing the three-phase sine wave voltages from the current detection controller with a voltage of the triangular wave generated by the triangular wave generator to generate and output the plurality of pulse width modulation signals to the switch section; and

    a phase current detector for detecting output signals of the plurality of analog/digital converters as the phase currents according to a control of the current detection controller.

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