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Power converter

  • US 9,287,815 B2
  • Filed: 09/28/2012
  • Issued: 03/15/2016
  • Est. Priority Date: 09/30/2011
  • Status: Active Grant
First Claim
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1. A power converter comprising:

  • a direct current supply configured to convert an input alternating current to a direct current link voltage having a pulsating component,an inverter circuit configured to convert, by switching, the direct current link voltage having a pulsating component received from the direct current supply, to an alternating current output having a predetermined frequency and a predetermined voltage to output the alternating current output to a permanent magnet synchronous motor; and

    a controller configured tocontrol the inverter circuit by vector control for combining fundamental voltage vectors to control the switching, andin a control state in which the fundamental voltage vectors do not include a zero vector which is a voltage vector for which a motor terminal voltage is zero, perform such control that a phase of a resultant voltage vector from a q-axis varies depending on the pulsating component, the resultant voltage vector being a resultant voltage vector of a d-axis voltage vector and a q-axis voltage vector of the permanent magnet synchronous motor.

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