Adaptable Speed Bridgeless SEPIC Converter VSI Fed BLDC Motor Drive

This paper discuss about a bridgeless SEPIC converter configuration which resolves the problem of power factor for brushless DC motor. The current path is designed with two switches only which reduce the conduction losses. The topology is designed in discontinuous current mode to improve the power factor and to reduce current stress in input side. Since, BLDC motor is driving from a 3φ AC voltage supply; a DC to AC converter is necessary. But this operation practically results in reduced output voltage. To avoid this problem, a inverter is implemented with pulse width modulation method to improve the efficiency of overall system.