Optimize Power MOSFET Performance In Motor Drive Designs

Focus:

This article provides a look into several MOSFET properties and how they affect the performance of a motor drive design. For those familiar with MOSFET operation and three-phase motor drives, this article will be mostly a review of fundamentals. Parameters that influence MOSFET selection are explained, equations are given for calculating conduction and switching losses in the motor drive applications, and factors such as switching frequency and edge rates, which influence both switching losses and EMI, are discussed. Tradeoffs in the different performance factors and in performance versus device cost are noted. Finally, this article points to a gate drive IC with adjustable drive current architecture, which makes it easier for designers to assess the impact of higher MOSFET switching speeds and their parasitic effects in three-phase motor drive designs.

What you’ll learn:

• How to select power MOSFETs for three-phase motor drive applications (introductory level)
• How to calculate conduction and switching losses in motor drive designs

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Author & Publication:

Nicholas Oborny, Texas Instruments, Dallas, Texas, How2Power Today, Jul 15 2017

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