-In bridge circuits, where reverse current flow is needed, an additional diode (called a freewheeling diode) is placed in parallel (actually anti-parallel) with the IGBT to conduct current in the opposite direction
*During the breaking of a motor inertia of the motor load can be recovered and the motor acts as a generator.
*The power flows from AC side to DC side of the converter and it operates in a rectifier mode.
*So the Free wheel Diodes works on during energy recovering.
*The recovered energy can be used in different ways.
- breaking of the motor as energy dissipated through a resistor.
- to charge a battery or a supercapacitor bank.
- also help to smooth the current at output.
