Motor overcurrent protection circuit and method

Abstract

The invention discloses a motor overcurrent protection circuit and method thereof. The motor overcurrent protection circuit comprises a motor, a motor driving module, a control chip, a current sampling module, a feedback module, a driving power supply and a control power supply. The first output end of the current sampling module is connected with the control end of the feedback module, the inputend of the feedback module is connected with the control power supply, and the output end of the feedback module controls the first port of the chip. The feedback module obtains the working current signal of the motor through the current sampling module and feeds back the high level or the low level to the first port of the control chip according to the magnitude of the working current signal of the motor. The control chip controls the motor driving module to stop or operate according to the high level or the low level of the first port. A simple peripheral circuit is designed in the control circuit of the motor so that the design of a motor current overcurrent protection point can be self-set. When the operation current of the motor reaches the set protection point, the current can be quickly, reliably and accurately turned off and the motor is further effectively protected.

Description

technical field [0001] The invention relates to the field of motor protection, in particular to a motor overcurrent protection circuit and method. Background technique [0002] Many electronic devices have a rated current, and it is not allowed to exceed the rated current, otherwise the device will be burned, so many devices have a current protection module. When the current exceeds the rated current, the device will automatically cut off the power to protect the device. [0003] At present, the common current protection of DC brushless motor is to obtain the current flowing through the motor through the current sampling resistor, connect the collected current to the MCU through the amplifier or directly through the sampling motor, and judge whether it is over-current through software calculation after AD sampling. This process involves a long wait for AD conversion and MCU processing, which makes the response time of the protection circuit too long, the motor may not be pro...

AI Technical Summary

Problems solved by technology

[0003] At present, the common current protection of DC brushless motor is to obtain the current flowing through the motor through the current sampling resistor, connect the collected current to the MCU through the amplifier or directly through the sampling motor, and judge whether it is over-current through software calculation after AD sampling. This process involves a long wait for AD conversion and MCU processing, which makes the response time of the protection circuit too long, the motor may not be protected in time, and there is a risk of the motor being burned

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