A reduced sensor PFC BL-Zeta converter based VSI fed BLDC motor drive


A reduced sensor PFC BL-Zeta converter based VSI fed BLDC motor drive


This video explains about design of the BL-Zeta (bridgeless Zeta) converter fed BLDC (Brushless DC) motor drive. A single-speed sensor is used for achieving PFC (Power Factor Correction) and speed control of the BLDC motor. A fundamental frequency switching is used for electronic commutation of BLDC motor for achieving reduced switching losses in the VSI. A speed follower approach is employed for voltage control in BL-Zeta converter operating in DCM (Discontinuous Conduction Mode). Moreover, the conduction losses in the DBR (Diode Bridge Rectifier) are also eliminated in a bridgeless topology of the Zeta converter. Satisfactory performance of the proposed drive is achieved for a wide range of speed control of BLDC motor and varying supply voltage to study the behavior of proposed drive-in practical supply conditions. Switches stresses are also analyzed for their selection and heat sink design. The power quality indices at AC mains obtained are found within the recommended limits by International power quality standards such as IEC 61000-3-2.

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