Three Phase Power Inverter

This is a more detailed look of the three-phase power inverter shown in the system diagram. The area within the dotted lines is a simplified version of the schematic for the three phase power inverter. The three-phase power inverter takes the DC power supply and converts the DC current to AC through a series of half H-bridges.

Each of the half H-bridges is composed of two transistors that control whether the phase is connected to positive or negative sides of the DC power supply. The switching of these half H-bridges control the characteristics of the AC current seen on the output to the motor.

The switching of the half H-bridges is controlled directly by signals from the gate drive circuit, which is driven by the control unit. The output of the half H-bridges feed back to the microcontroller in order to provide the device with information regarding the current state of each phase of the the motor. These signals are then used to continually modify the outputs.