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Method for controlling a converter having variable frequency control and system for powering a vehicle load using same

  • US 9,306,465 B2
  • Filed: 06/10/2011
  • Issued: 04/05/2016
  • Est. Priority Date: 06/10/2011
  • Status: Active Grant
First Claim
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1. A method of controlling a converter having a plurality of switches for use in converting a DC input to an AC output, the plurality of switches being selectively operable between an open state and a closed state to provide variable switching frequency, the method comprising:

  • determining a first switching frequency for the plurality of switches, the first switching frequency operable to induce zero voltage switching (ZVS) of the plurality of switches when transitioning from the open state to the closed state, such that the AC output has a first power level;

    determining a second switching frequency for the plurality of switches, the second frequency less than the first frequency, the second switching frequency operable to induce non-zero voltage switching (NZVS) of the plurality of switches when transitioning from the open state to the closed state, such that the AC output has a second power level less than the first power level;

    measuring a voltage across at least one of the plurality of switches to determine one of ZVS and NZVS;

    determining ZVS in the event the voltage is approximately zero when the at least one of the plurality of switches transitions from the open state to the closed state; and

    determining NZVS in the event the voltage is sufficiently greater than zero when the at least one of the plurality of switches transitions from the open state to the closed state.

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