Reducing Switching Losses in BLDC Motor Drives by Reducing Body Diode Conduction of MOSFETs


This paper presents a brand new power electronic topology that aims to cut back switching losses in exhausting-switched inverters for brushless dc (BLDC) motor drives. This is often achieved by extending the benefits of synchronous rectification employed in low-voltage switch-mode dc–dc conversion to high-voltage motor drive applications and by minimizing the reverse conduction behavior of the intrinsic body diode of the synchronous rectifier MOSFET. The proposed topology for reducing body diode conduction includes the addition of a MOSFET in series with the rectifying switch and a SiC Schottky diode around the series switch combination. This paper focuses on theory, simulations, and experimental results and validates the benefits of proposed new topology for BLDC motor drive applications. An extension of this topology for sinusoidal back electromotive force permanent-magnet motors is additionally presented.

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