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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.

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