Efficient Power Conversion has introduced the EPC91121, a three-phase BLDC motor drive evaluation board built around its seventh-generation EPC2366 40 V eGaN power transistor, aimed at rapid prototyping for drones, robotics, industrial automation, power tools, and other compact electromechanical systems.

The board measures 79 mm x 80 mm and is designed for 24 V-class battery systems, with an input range of 18 V to 30 V. EPC says it can deliver up to 70 A peak, or 50 ARMS, and integrates the major building blocks needed for a motor inverter, including gate drivers, housekeeping power supplies, voltage and temperature monitoring, and current sensing.

On the measurement side, the board supports high-bandwidth current sensing on all three phases up to ±125 A, along with phase and DC-bus voltage sensing for motor-control techniques such as field-oriented control and space-vector PWM. It also includes shaft encoder and Hall-sensor interfaces, plus multiple test points for easier debugging and system integration.

At the heart of the platform is the EPC2366 Gen 7 eGaN FET, which EPC says has an on-resistance of 0.84 mΩ. The company says the EPC91121 supports PWM switching frequencies up to 150 kHz—well above typical silicon-based motor drives—helping reduce magnetic size and improve dynamic response. EPC also says the board’s layout keeps dv/dt below 10 V/ns to reduce distortion, acoustic noise, torque ripple, and EMC headaches.

Source: Efficient Power Conversion