High Voltage Gain PFC Converter Fed BLDC Motor Ceiling Fan

The high voltage gain power factor corrected switched inductor zeta (PFC-SI-Zeta) converter fed permanent magnet brushless direct current motor (PMBLDCM) is presented for the ceiling fan (CF). It is designed to operate in discontinuous conduction mode (DCM) with high switching frequency and variable voltage output to reduce passive components size and get the natural unity power factor (UPF) operation. The high voltage gain of the converter eliminates the requirement of a transformer, which reduces the cost, size, and losses. The high-frequency PWM pulses for the converter switch are generated by CF speed with appropriate gain by considering the constant supply voltage. It eliminates the requirement of the voltage sensor and its sensing circuitry, which reduces the cost and size of CF. The front-end PFC-SI-Zeta converter is used to get the improved power quality indices at the supply input. The variable voltage output of the SI-Zeta converter is used to drive the inverter-fed PMBLDCM fan. It offers the inverter to operate at commutation frequency, and it reducing switching losses and improving efficiency. The position Hall sensors of the motor are eliminated using back-EMF sensorless control. It reduces the overall cost of the CF. Simulated results are shown to validate the concept and design of the converter.