Output inverter for single phase and output current detecting method thereof

A method of detecting a current of an output inverter for single phase, said output inverter comprising:

• a first arm coupled to positive and negative electrodes of a DC power supply, the first arm comprising:
• two first parallel connectors coupled in series, each of the first parallel connectors comprising:
• a semiconductor switching element;
• and
• a diode coupled in parallel in a reverse direction with the semiconductor switching element, and
• a first current detector coupled to one of the first parallel connectors and the positive electrode of the DC power supply,
• a second arm coupled to the positive and negative electrodes of the DC power supply and coupled in parallel with the first arm, the second arm comprising:
• two second parallel connectors coupled in series, each of the second parallel connectors comprising:
• a semiconductor switching element;
• and
• a diode coupled in parallel in a reverse direction with the semiconductor switching element, and
• a second current detector coupled to one of the second parallel connectors and the negative electrode of the DC power supply,
• said method comprising:
• (a) detecting a current in a first convection mode, which flows back through the first parallel connector coupled to the first current detector, and an overcurrent caused by a short circuit of the first arm, using the first current detector;
• and
• (b) detecting a current in a second convection mode, which flows back through the second parallel connector coupled to the second current detector, and an overcurrent caused by a short circuit of the second arm, using the second current detector