Power Factor Corrected Bridgeless Converter for Sensorless PMBLDC Motor of Ceiling Fan

In order to achieve low cost and high efficiency with improved power quality at AC mains, a single stage bridgeless flyback (SSBL-Flyback) converter is used to drive the sensorless brushless direct current (BLDC) motor for the ceiling fan. In this, the conduction losses are reduced due to bridgeless configuration of the power factor corrected (PFC) converter. It is consisting of a dual flyback configuration, which provides good power quality indices at the AC mains. The PFC converter is designed in the discontinuous mode (DCM). The high frequency transformer provides the flexibility to improve the gain and design with lower voltage stress across the switch. The main aim of this paper is to eliminate all sensors including the PFC converter output DC link voltage sensor and reduce the overall cost of the BLDC motor ceiling fan with improved power quality at the AC input. An auxiliary winding voltage is used to take care of the input voltage variation and it is also utilized to control the PFC converter output voltage (DC link voltage) and correspondingly, ceiling fan speed is controlled. The voltage source inverter (VSI) is switched at fundamental frequency to reduce the switching losses in VSI. The behaviour of the ceiling fan is simulated in the MATLAB and shown in results section to validate the design.