This paper presents a power factor corrected (PFC) bridgeless (BL) buck boost fed brushless direct current (BLDC) motor drive as a cost effective solution for low power applications. An approach of speed control of the BLDC motor by controlling the DC link voltage of the voltage source inverter (VSI) is used with a single voltage sensor. This facilitates the operation of VSI at fundamental frequency switching by using the electronic commutation of the BLDC motor which offers reduced switching losses. A BL configuration of the buck boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the conduction losses associated with it. A PFC BL buck boost converter is designed to operate in a discontinuous inductor current mode (DICM) to provide an inherent PFC at AC mains. The performance of the proposed drive is evaluated over a wide range of speed control and varying supply voltages (universal AC mains at 90-265V) with improved power quality at AC mains.
The obtained power quality indices are within the acceptable limits of international power quality standards such as the IEC 61000.3.2. The performance of the proposed drive is simulated in the MATLAB / Simulink environment, and the obtained results are validated experimentally on a prototype of the drive.