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Resistance detection circuit and resistance detection method

A detection circuit and resistance technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as false alarms, slow detection timeliness when resistance occurs, and reduce the judgment time and reduce the probability of burning. Effect

Active Publication Date: 2019-04-12
NINGBO JOHNSON ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides a resistance detection circuit and a resistance detection method to solve the problems of false alarms and slow timeliness of resistance detection when the existing motor is turned on normally.

Method used

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  • Resistance detection circuit and resistance detection method
  • Resistance detection circuit and resistance detection method
  • Resistance detection circuit and resistance detection method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] The resistance detection circuit includes a motor, the motor has a motor retraction function, and includes a motor path, the motor path is connected in series with a resistor, and a voltage monitoring device is arranged at both ends of the resistor, and the voltage monitoring device is connected in series. LM358 dual operational amplifier circuit, the voltage value amplified by the LM358 dual operational amplifier circuit is sent to the ADC input terminal of the single-chip microcomputer, the motor is provided with an alarm, and the alarm is connected to the ADC output terminal of the single-chip microcomputer, and the resistance detection method Include the following steps,

[0025] A) Set the current fluctuation value XmA;

[0026] B) Use the single-chip ADC to sample the current when the motor is initially turned on, and make a fitti...

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Abstract

An obstruction detection circuit comprises a motor which has a motor backward function. The obstruction detection circuit comprises a motor closed circuit which is serially connected with a resistor. Two ends of the resistor are provided with a voltage monitoring device. The voltage monitoring device is serially connected with an LM358 double operational amplifier circuit. A voltage value amplified by the LM358 double operational amplifier circuit is sent to an ADC input end of a single-chip microcomputer. The invention has the following beneficial effects that the problem in the prior art that alarming is activated when a motor starts and meets obstruction is solved, alarming is activated only when the motor meets obstruction, the determination time is greatly shortened, and the probability of burning the motor is reduced.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a resistance detection circuit and a resistance detection method. Background technique [0002] When the motor starts normally, the current will show the characteristics of rising first, then falling, then rising and finally leveling off, but when the motor is blocked, the current will continue to rise sharply. Mathematically, it is the current derivative when the motor starts normally. It does not change monotonically; however, the current derivative when the motor is blocked is monotonically changing. Overcurrent and overload protection means that when the operating current of the motor exceeds a certain limit, the power supply of the motor needs to be cut off to ensure that the motor will not be burned and damaged; The function means that during the operation of the motor, if the platform hits or touches an obstacle, the system can detect it in time and issue a generator fall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 卢连苗卢勃杨军民
Owner NINGBO JOHNSON ELECTRIC CO LTD