Patent ID: 8582331

Claim:
Neutral point clamped, (NPC), inverter circuit comprising: a first input terminal for being connected to a DC voltage of a first polarity, and a second input terminal for being connected to a DC voltage of a polarity opposite to said first polarity; an input neutral point terminal for being connected to a ground potential; a first output connected to a first end of a first decoupling inductor; a second output connected to a first end of a second decoupling inductor; an output connection point for outputting an AC voltage being connected to a second end of the first decoupling inductor and to a second end of the second decoupling inductor; a first metal oxide semiconductor field effect transistor (MOSFET), a second MOSFET, a third MOSFET, and a fourth MOSFET, wherein each of the first, second, third, and fourth MOSFET has a parasitic body diode, a drain of the first MOSFET is connected to the first input terminal and a source of the first MOSFET is connected to a drain of the second MOSFET, a source of the second MOSFET is connected to the first output, a drain of the third MOSFET is connected to the second output, and a source of the fourth MOSFET is connected to the second input terminal and a drain of the fourth MOSFET is connected to a source of the third MOSFET; a first diode and a second diode, wherein a cathode of the first diode is connected to the drain of the second MOSFET, a cathode of the second diode and an anode of the first diode are connected to the input neutral point terminal, and an anode of the second diode is connected to the source of the third MOSFET; a third diode and a fourth diode, wherein a cathode of the third diode is connected to the first input terminal and an anode of the third diode is connected to the second output; and an anode of the fourth diode is connected to the second input terminal and a cathode of the fourth diode is connected to the first output.