Voltage Source Inverter Voltage source Inverter is a device that converts power from a DC constant voltage source into AC form by switching behavior. The output voltage has a switching waveform and the output current has AC form. It is classified into two inverters: square wave inverter and PWM inverter. Fig 2. Voltage Source Inverter 2 Fig 1. Voltage Source Inverter 1 It consists of 3 pairs of 2 switching components. Depending on the switching condition, input and output voltage are determined. In order to prevent short circuit accident, switching component works in a commensurate way. 1. 3 Phase 2-Level Inverter Fig 3. General Circuit of 3 phase 2-level inverter Fig 3 is a common circuit of an 3 phase 2-level inverter. Line voltage has 3 level form which is +Vdc, 0, and -Vdc, The detail about this inverter is explained in one of my past posts titled as "Inverter: Single Phase Inverter and 3 Phase Inverter" 2. 3 Phase 3-Level Invert