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Power conversion apparatus with frequency operation change based on input voltage

  • US 9,887,638 B2
  • Filed: 02/24/2016
  • Issued: 02/06/2018
  • Est. Priority Date: 02/27/2015
  • Status: Active Grant
First Claim
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1. A power conversion apparatus comprising:

  • an LLC resonant type DC/DC converter that changes a voltage of DC power from a power supply;

    an inverter that converts DC power from the DC/DC converter into AC power;

    a converter controller that controls the DC/DC converter; and

    an inverter controller that controls the inverter,wherein if an input voltage of the DC/DC converter is lower than a first voltage value that is set in advance, the converter controller maintains an output voltage of the DC/DC converter within a first voltage range that is set in advance by changing an operation frequency of switching of the DC/DC converter in compliance with the input voltage as a first voltage maintaining control,wherein if the input voltage is higher than a second voltage value that is higher than the first voltage value, the converter controller maintains the output voltage within a second voltage range that is higher than the first voltage range by changing the operation frequency in compliance with the input voltage as a second voltage maintaining control,wherein the converter controller increases the operation frequency as the input voltage is increased in the first voltage maintaining control and increases the operation frequency as the input voltage is increased in the second voltage maintaining control,wherein if the input voltage is higher than a third voltage value and is lower than a fourth voltage value, the converter controller uses;

    (i) the third voltage value that is higher than the first voltage value and (ii) the fourth voltage value that is higher than the third voltage value and lower than the second voltage value, and maintains the output voltage within a third voltage range that is higher than the first voltage range and lower than the second voltage range by increasing the operation frequency as the input voltage is increased as a third voltage maintaining control,wherein if the input voltage is equal to or greater than the first voltage value and is equal to or less than the third voltage value, the converter controller maintains the operation frequency within a second frequency range that is set in advance as a second frequency maintaining control, andwherein if the input voltage is equal to or greater than the fourth voltage value and is equal to or less than the second voltage value, the converter controller maintains the operation frequency within a third frequency range that is higher than the second frequency range as a third frequency maintaining control.

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