Multi-level inverter

  • US 10,886,832 B2
  • Filed: 05/08/2020
  • Issued: 01/05/2021
  • Est. Priority Date: 03/26/2014
  • Status: Active Grant
First Claim
Patent Images

1. An apparatus comprising a single phase multi-level inverter configured to output, between a first AC output and a second AC output of the single phase multi-level inverter, an AC voltage for a grid operated at an AC line frequency, the single phase multi-level inverter comprising:

  • a first phase circuit comprising a first flying capacitor circuit comprising a first bank and a second bank of series connected switches and configured to be switched at a frequency, and a capacitor connected between one of the series connected switches in the first bank and a corresponding one of the series connected switches in the second bank;

    a second phase circuit comprising a second flying capacitor circuit comprising a third bank and a fourth bank of series connected switches and configured to be switched at the frequency, and a capacitor connected between one of the series connected switches in the third bank and a corresponding one of the series connected switches in the fourth bank, wherein the first bank and the second bank are connected in series, and the third bank and the fourth bank are connected in series;

    a first set of switches connecting the first phase circuit between voltage inputs and configured to be switched at the AC line frequency;

    a second set of switches connecting the second phase circuit between the voltage inputs and configured to be switched at the AC line frequency; and

    an interphase balancing circuit comprising a first pair of terminals connected in parallel across the first phase circuit and a second pair of terminals connected in parallel across the second phase circuit.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×