Abstract

A single stage and single switch boost-flyback PFC (Power Factor Correction) converter for a permanent magnet BLDC (Brushless Direct Current) motor drive used in ceiling fan, is presented in this paper. The AC-DC PFC converter is designed in discontinuous inductor current mode (DCM) with a power input of 30 W with the low voltage stress across the switch and to obtain inherent unity power factor at the input mains. The auxiliary winding voltage is utilized to regulate the PFC converter output voltage (DC link Voltage) and it is utilized for speed control of BLDC motor based ceiling fan. It reduces the DC link voltage sensor, which further reduces the cost of the ceiling fan. The switching losses of VSI (Voltage Source Inverter) are reduced by low frequency switching of its six switches used for an electronic commutation. This topology consists of an AC-DC single switch boost-flyback PFC converter cascaded with a VSI and a BLDC motor. In this, the PFC converter uses the single voltage control loop to get the inherent power factor correction at the AC mains. Performance of the PFC converter based ceiling fan is simulated in MATLAB and its behaviour has been shown to confirm the design and control of PFC converter ceiling fan system. The power quality performance of this topology is found to adhere the international harmonics standard IEC61000-3-2 for the universal input supply.

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