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CONTROL METHOD OF INVERTER CIRCUIT

  • US 20170005592A1
  • Filed: 05/03/2016
  • Published: 01/05/2017
  • Est. Priority Date: 07/03/2015
  • Status: Active Grant
First Claim
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1. A control method for controlling an inverter circuit, the inverter circuit comprising at least one bridge arm, an inductor and a parasitic capacitor, the bridge arm comprising an upper switch element and a lower switch element connected in series, the upper switch element and the lower switch element being alternately turned on and turned off to convert a DC input voltage to an AC output voltage, the control method comprising steps of:

  • dividing a half cycle of the AC output voltage into a first stage and a second stage;

    controlling the upper switch element and the lower switch element of the bridge arm to be operated at a first switching frequency lower than a preset threshold frequency in the first stage, so that the inverter circuit is operated in a continuous current mode; and

    controlling the upper switch element and the lower switch element of the bridge arm to be operated at a second switching frequency in the second stage, so that the upper switch element and the lower switch element are turned on at a preset voltage level and the inverter circuit is operated at a discontinuous current mode boundary mode.

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