Brush motor current limiting circuit

Abstract

The invention belongs to a brush motor driving control technology, and relates to a brush motor current limiting circuit. The brush motor current limiting circuit comprises a current sampling circuit,a transistor switching circuit and a field effect transistor switching circuit, and the brush motor current limiting circuit is connected to the front end of a motor in series; when the motor is overloaded or locked and the current consumption is over-large, the current limiting circuit cuts off power supply to the motor, after a little delay, the current limiting circuit supplies power to the motor again, if the current consumed by the motor still exceeds a preset threshold at the moment, the motor is cut off again and then is supplied with power, the processes of power failure, delay, powersupply, delay and power failure are repeated, and in the process, due to the fact that a motor winding has the inductance characteristic and delay exists between the power supply process and the power failure process, a current continuously flows through a motor winding coil, and a motor output shaft has continuous torque output. By adjusting the parameters of the current limiting circuit, the magnitude of the current during current limiting can be controlled within a preset value range so as to prevent the motor and the external circuit from over-current damage.

Description

technical field [0001] The invention belongs to motor drive control technology, and relates to a brushed motor current limiting circuit. Background technique [0002] Existing current limiting circuits for brushed motors either need to introduce complex logic devices such as single-chip microcomputers, DSPs, and A / D acquisitions; or use electronic components such as operational amplifiers and comparators that require separate power supplies, and the circuit power supply is complicated. It cannot meet the requirements of miniaturization and simple interface of mechatronic equipment. Contents of the invention [0003] The purpose of the present invention is to propose a current-limiting circuit that can ensure the safety of the motor and peripheral circuits while providing the motor with the necessary current to maintain the output torque of the motor when the brushed motor is overloaded or blocked; the circuit does not need a separate Mains powered and composed of non-comp...

AI Technical Summary

Problems solved by technology

[0002] The current limiting circuit of the existing brushed motor, or need to introduce complex logic devices such as single-chip microcomputer, DSP, A / D acquisition;

It cannot meet the requirements of miniaturization and simple interface of mechatronic equipment

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