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Producing multi-level output voltage from just two fast-switching semiconductors by using a coupled inductor. This frees the inverter from dead-time and greatly reduces low-order harmonics.

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Competitive advantage

  • More reliable: coupled inductor lowers the risk of DC-link shoot-through
  • Cost-effective: Fewer semiconductors are employed for three-level output
  • Simpler control: no need to balance DC-link capacitors voltage under any condition


  • Improves efficiency and reliability
  • Successful applications
  • Inverter-based five-phase permanent-magnet synchronous machine-drive system

Capabilities and facilities

  • Advanced control platform with DSP and FPGA
  • High bandwidth oscilloscope
  • Multifunction test rig
  • Four-quadrant 20 kW programmable power supply