ASIL-D Functional Safety Silicon Carbide Motor Control Unit (MCU)

As one of the most technically sophisticated controllers among the three core electric components of new energy vehicle powertrain systems, the Motor Control Unit (MCU) is not only responsible for vehicle power output regulation, but also exerts a vital impact on vehicle drivability, driving safety and comfort.

The MCU receives high-voltage energy from the high-voltage battery, converts high-voltage DC signals into three-phase alternating current signals and outputs them to the motor actuator in accordance with the torque demand commands from the vehicle controller. Meanwhile, the system effectively monitors the output torque indicators to ensure the deviation between the actual output torque and the demanded torque stays within the specified range, reliably guaranteeing driving safety and comfort.

This MCU solution adopts ST’s latest-generation SiC technology and meets the ASIL-C torque safety requirements for functional safety, featuring high power density and compact design. The overall structural design is optimized to place capacitors and SiC components close to the water-cooling plate, enabling sufficient water-cooling heat dissipation for both components and further reducing the overall equipment volume.

The overall electromagnetic compatibility design of the product complies with Class3 requirements. The control board and drive board are separated in the design as much as possible, with appropriate shielding measures and input filtering adopted to achieve optimal parameters of EMC performance and thermal performance. In addition, the solution can rapidly respond to various faults of the power module (short circuit, overcurrent, overvoltage, overtemperature, etc.) to ensure the safety of the power module.

The company is committed to providing high-quality mass-production solutions for powertrain domain products (single-motor electronic control, dual-motor electronic control, power products such as DCDC and OBC). It has mature design modules and product solutions in both software and hardware. In accordance with the standard requirements of ISO 26262, ISO 21434 and ASPICE, the team complies with the development process specifications for functional safety and cybersecurity. Meanwhile, the adoption of the ASIL-D compliant multi-core main control chip SPC58NN and ASIL-D compliant external monitoring safety power chip L9396 provides solid support for complex algorithms and functional safety implementation.