Figure 2-8 Inverter Block Diagram (DC to AC Converter)

The inverter is in charge of turning DC voltage into AC voltage. Isolated current sensing is needed in the inverter for motor control. Applications include the traction inverter or EESM for automotive and motor control for motor drive applications. The first location, indicated by the red box in Figure 2-8, is the traditional location, which is located before the optional filter. The best choice is to use a gate driver present design using the high-side gate driver supply of each phase to power the corresponding device. The second location, indicated by the blue box in Figure 2-8, is the sinusoidal location, which is located after the optional filter. The best choice is to use a no gate driver present design. The need for an optional filter can be more many reasons. First, the design can be used to reduce noise from nearby systems for applications where the motor and motor controller are not next to each other such as in factory automation. Second, the design can be used to reduce transient over-voltages due to switching in the power stage and potential damage to the motor windings.