Silicon Carbide MOSFET Motor Drive Evaluation Board in TO247 Packages

March 31, 2020 by Paul Shepard

The EVAL-M5-IMZ120R-SIC from Infineon Technologies is a complete evaluation board including a six discrete silicon carbide CoolSiC™ MOSFETs realizing a B6 inverter for motor drive applications. In combination with control boards equipped with the M5 32-pin interface connector such as the XMC DriveCard 4400, it features and demonstrates Infineon's CoolSiC™ MOSFETs in motor drives.

The evaluation board EVAL-M5-IMZ120R-SIC was developed to support customers during their first steps designing applications with CoolSiC™. The MOSFET has a rated blocking voltage of 1200V at a typical on-state resistance of 45mΩ. It is optimized for motor drive applications with a high-frequency switching operation.

This evaluation board is designed to be an easy-to-use power stage based on Infineon's discrete silicon carbide power MOSFETs. The board is equipped with all assembly groups for sensorless field oriented control (FOC). It provides a three-phase AC-connector, EMI filter, rectifier and a 3-phase output for connecting the motor. The power stage also contains isolated current, voltage and temperature sensing circuits.

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Block diagram of the EVAL-M5-IMZ120R-SIC (click on image to enlarge)

The evaluation board characteristics are:

  • Input voltage 340- to 480-Vac
  • Peak 11kW motor power output
  • On board EMI filter
  • Basic insulation between power and signal part
  • Isolated current sensing with ΣΔ-ADC
  • Isolated sensing of dc-link voltage by ΣΔ-ADC
  • Thermistor output
  • Overload and short-circuit hardware protection
  • Overtemperature hardware protection
  • All six switches turn off during protection
  • Rugged gate driver technology with stability against transient and negative voltage
  • Auxiliary power supply with 5V
  • Measurement test-points compatible to standard oscilloscope probes
  • PCB is 259mm x 204mm and has four layers with 35μm copper each
  • RoHS complaint