A method for realizing a safety mechanism of a motor control system based on a MCU + CPLD structure

Abstract

The invention discloses a method for realizing safety mechanism of motor control system based on MCU + CPLD structure, the three-phase current in the stator winding of a motor, Fault FO signal of eachIGBT in three-phase bridge circuit, The bus voltage signals of the DC power supply Udc are input to the control circuit. The signals are processed by the control circuit and output to the MCU and theCPLD / FPGA processor. The MCU and the CPLD / FPGA process these signals together and process the corresponding fault and enter the safety mechanism. Using this scheme to realize the security mechanism,because of the joint redundancy detection mechanism of MCU + CPLD / FPGA, the motor system can still ensure the safety of the whole vehicle and the human body when one side of the hardware failure occurs. Due to the parallel processing mechanism of CPLD / FPAG processor, the response time from fault detection to fault processing is ensured to be at the level of us, while the response time of fault processing of MCU is at the level of ms, which greatly shortens the time to enter the safety mechanism, so that the motor system ensures the safety of the whole vehicle and the person in the shortest time.

Description

technical field [0001] The invention relates to a motor control system, in particular to a method for realizing a safety mechanism of a motor control system based on an MCU+CPLD architecture. Background technique [0002] During the driving of electric vehicles, if any part of the vehicle suddenly fails, the vehicle needs to enter the safety mechanism. The implementation of the safety mechanism must be very reliable, otherwise it will threaten the safety of the vehicle and personal safety. In the system architecture, the joint operation of MCU+CPLD / FPGA is used to double guarantee the realization of the safety mechanism. The MCU detects faults by detecting external signals, and outputs 6 channels of PWM to the CPLD, and the MCU has related serious error signals directly to the driver. The operation of the safety mechanism is guaranteed on the circuit; the CPLD receives the external input fault signal and quickly processes it and judges whether to enter the safety mechanism a...

AI Technical Summary

Problems solved by technology

This patent implements active short-circuit protection by adding an external logic circuit, such as figure 1 As shown, the active short-circuit state is entered from the hardware circuit, and it is only one of the safety mechanisms. The safety mechanism is not comprehensive, and the logic is simple and cannot realize the ability of complex detection and processing safety mechanisms.

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