×

Apparatus for converting direct current to alternating current using an active filter to reduce double-frequency ripple power of bus waveform

  • US 8,279,642 B2
  • Filed: 09/21/2009
  • Issued: 10/02/2012
  • Est. Priority Date: 07/31/2009
  • Status: Active Grant
First Claim
Patent Images

1. An inverter for converting an input direct current (DC) waveform from a DC source to an output alternating current (AC) waveform for delivery to an AC grid, the inverter comprising:

  • an input converter electrically coupled to a power bus and including a transformer, the input converter being configured to convert the input DC waveform to a bus waveform supplied to the power bus;

    an output converter electrically coupled to the power bus and configured to convert the bus waveform to the output AC waveform at a grid frequency; and

    an active filter electrically coupled to the power bus and configured to reduce a double-frequency ripple power of the bus waveform by supplying power to and absorbing power from the power bus to maintain a bus voltage to track a desired bus voltage signal,wherein the active filter comprises a switching circuit coupled to an energy storage device.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×