Voltage controlled PFC Zeta converter based PMBLDCM drive for an air-conditioner

This paper presents a Zeta DC-DC converter as a power factor correction (PFC) converter which is operated in voltage control mode for speed control of a permanent magnet brushless DC motor (PMBLDCM). The proposed converter performs the PFC action and DC link voltage control in single stage and needs only one controller. The current multiplier approach with average current control is employed for PFC controller which is designed for continuous conduction mode (CCM) of operation. For the control of current and torque in the PMBLDCM, a rate limiter is designed in the reference voltage at DC link. Detailed design, modeling and performance of the proposed drive are presented for an air-conditioner driven by a PMBLDC motor of 0.817 kW, 1500 rpm rating. The designed PFC converter results in an improved power quality at AC mains in a wide range of motor speed and input AC voltage.