Design of FOC Drive Circuit for Low-Power BLDC

Abstract

This paper presents the comprehensive design of a drive circuit for low-power brushless DC (BLDC) motors based on the Field-Oriented Control (FOC) algorithm. To meet the demands of applications requiring high efficiency, high precision, and a compact form factor, this design integrates carefully selected components into a robust system. The core of the control system is an STM32F405RGT6 microcontroller, which provides the necessary computational performance for complex FOC algorithms. A DRV8301 integrated gate driver is utilized to drive the three-phase MOSFET inverter bridge, simplifying the power stage and incorporating essential features such as a buck converter and various protection circuits. For accurate feedback, the circuit employs a high-side, three-shunt current sensing architecture with AD8418 amplifiers, enabling precise current measurement. The design also includes stable power management, a CAN bus interface for reliable communication, and sensors for voltage and temperature monitoring. The resulting hardware provides a highly integrated, efficient, and reliable solution for the precise control of low-power BLDC motors in applications like robotic joints, drones, and advanced consumer electronics.