Circuit fault state detection method applied to brushless motor

• Main Authors: ZHANG QI, GU YUJUN, TAN WEIGENG, ZHU XINPING, ZHONG WEILIANG, XIAO PINGTING
• Format: Patent
• Language: Chinese; English
• Published: 18.12.2018
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to a circuit fault state detection method applied to a brushless motor. The circuit fault state detection method comprises the following steps: separately detecting drain sourcevoltages of MOSFET (Metal Oxide Semiconductor Field Effect Transistor) driving pipes when a circuit is running and when the circuit is stopped, so as to detect the circuit fault at this moment. The circuit fault state detection method disclosed by the invention also comprises steps that an MCU (Micro Control Unit) outputs a specific control signal by controlling a PWM (Pulse Width Modulation) signal; and a hardware module collects MOSFET current, and compares the MOSFET current to a set threshold voltage value (VDS) through a hardware voltage comparator to quickly diagnose short circuit and open circuit abnormality, and is applied to the driving of the brushless motor. 本发明涉及种应用于无刷电机的电路故障状态检测方法，其中该方法通过在电路运行状态时以及电路停机状态时分别检测MOSFET驱动管的漏源电压，以对此时的电路故障进行检测。采用了该发明中的应用于无刷电机的电路故障状态检测方法，MCU通过控制PWM信号输出特定控制信号，硬件模块采集MOSFET电流，并通