The popular variable speed motor drive use a digitally controlled general purpose inverter equipped with DC voltage boost feature to operate motor driven industrial equipment. These VSD systems can be remotely controlled via USB and/or ethernet interfaces. Continued miniaturization of VFD requires compact component design and low-noise and high efficiency operation. The power module can be used to provide DC power required for the inverter and for the microcontroller and other internal electronics. The low noise operation of the power module insures quiet as well as energy-saving high efficiency operation.