Current detecting circuit for overload protection and overcurrent protection of brushless direct current motor

A technology of current detection circuit and brushed DC motor, which is applied in the direction of measurement using digital measurement technology, can solve the problems of affecting control accuracy, saturation of transformer magnetic core, poor accuracy, etc., and achieve simple circuit structure and current detection accuracy High and low cost effect

CN103558452AInactive Publication Date: 2014-02-05TIANJIN JINBO INSTR TECHN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-02-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a current detecting circuit for overload protection and overcurrent protection of a brushless direct current motor. The current detecting circuit for the overload protection and the overcurrent protection of the brushless direct current motor comprises a single-chip microcomputer, a current sampling circuit and a power module, and the current sampling circuit is connected with the single-chip microcomputer and the power module respectively. The current detecting circuit for the overload protection and the overcurrent protection of the brushless direct current motor has the advantages that the influences of magnetic core saturation brought by a current transformer are avoided, the current detection precision is high, the circuit structure is simple, cost is low, and the current detecting circuit for the overload protection and the overcurrent protection of the brushless direct current motor is easy to implement and can achieve the overload protection and the overcurrent protection of the brushless direct current motor.
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Description

technical field

[0001] The invention relates to a current detection circuit for overload protection and overcurrent protection of a brushless direct current motor. Background technique

[0002] In the electric actuator, the torque limiting mechanism is used to cut off the motor control circuit when the load torque is too large, so that the motor stops until the fault is eliminated, so as to avoid overload, so as to ensure the integrity of the physical structure of the motor and the safety of the operator. The electronic torque detection method can obtain a more accurate torque value through calculation, so in some occasions it has replaced the mechanical torque limiting mechanism that can only qualitatively reflect the magnitude of the torque, and has become a common method for torque detection.

[0003] According to the basic theory of the motor, its torque value can be obtained by calculating the motor current, speed, etc., and the speed is relatively easy to observe. Ther...

Examples

Embodiment Construction

[0011] Such as figure 1 , 2 , 3, the current detection circuit for brushless DC motor overload protection and overcurrent protection, including single-chip microcomputer, current sampling circuit and power module, the current sampling circuit is connected with the single-chip microcomputer and power module respectively; the specific circuit connection is: current sampling In the circuit, pin 1 of the operational amplifier chip U9 is connected to pin 22 of the microcontroller and one end of resistor R48, pin 2 is connected to one end of resistor R55 and the other end of resistor R48, pin 3 is connected to resistor R50 and one end of capacitor C48 , The 6-pin connection of the operational amplifier chip U9, the 5-pin connection with one end of the resistor R56 and the resistor R49, the 7-pin connection with the 9-pin connection of the single-chip microcomputer U10, the 4-pin connection with the public ground GND, and the 8-pin connection with the chip power supply VCC; The 22 p...