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

This paper presents a new power electronic topology that aims to reduce switching losses in hard-switched inverters for brushless dc (BLDC) motor drives. This is achieved by extending the benefits of synchronous rectification used in low-voltage switch-mode dc-dc conversion to high-voltage motor dri...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2015-03, Vol.51 (2), p.1864-1871
Main Authors: Brown, Cameron D., Sarlioglu, Bulent
Format: Article
Language:English
Subjects:
Bridge circuits
Brushless DC motors
Delays
Logic gates
MOSFET
Schottky diodes
Switches
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Summary:This paper presents a new power electronic topology that aims to reduce switching losses in hard-switched inverters for brushless dc (BLDC) motor drives. This is achieved by extending the benefits of synchronous rectification used 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 also presented.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2014.2344506