frist

The first section consists of a DC converter

The DC converter converts the incoming power supply from AC to DC using four diodes connected like a bridge. Inductors and capacitors are connected before the converter to reduce the electrical noise being introduced into the power supply due to the switching of the transistors.

In the simplified diagram below, the single phase power supply is used. If 3-phase supply is used, six diodes will be needed to convert the AC power to DC power.