The Impact of Deadtime on Motor Control Designs

GaN FETs switch faster and have zero reverse recovery compared to MOSFETs allowing them to operate at higher frequency efficiently and reduce dead time to values not achievable with other technologies. This opens the possibility of higher switching frequency motor drives where 20 – 40 kHz have traditionally been used. Additional benefits of operating at a higher switching frequency include:

[1] higher switching frequency motor drives to reduce/eliminate bulky electrolytic capacitors

[2] reducing the dead time to increase the effective torque per ampere obtained from the motor

[3] Net result is that GaN makes the motor drive system more efficient

[4] and allows integration within the motor thus reducing weight and size

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