Device for expanding detection range of current sensor

Abstract

The invention discloses a device for expanding the detection range of a current sensor. The device comprises a detection module and a bypass shunting module, the input ends of the detection module and the bypass shunting module are respectively connected with the output end of the power supply, and the output ends of the detection module and the bypass shunting module are respectively connected with the load module; the bypass shunting module is a copper laying plane on a PCB, the copper laying plane and a current detection pin of the detection module are arranged in parallel, power supply current flowing from a power supply to the load module is divided into two parts, and shunting of the power supply current is achieved. The bypass shunt module has a known shunt ratio, and the actual power supply current provided by the power supply is calculated according to the shunt ratio and the output current value of the detection module; shunting is carried out by adopting a PCB printed wire shunting scheme, so that large current detection can be realized by adopting a small-range current sensor detection mode, a large number of discrete electronic devices do not need to be used, and the circuit has the advantages of small circuit size, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of motor control, and more specifically relates to a device for expanding the detection range of a current sensor. Background technique [0002] The electric servo mechanism for aerospace uses various motors (DC brush motor, DC brushless motor, permanent magnet synchronous motor) as the core of electromechanical energy conversion. The current is relatively large, in order to prevent damage to other related devices by the inrush current, it is necessary to limit the inrush current. [0003] The current limiting method is to detect the bus current. The detected signal is compared with a reference voltage through a comparator. When the detected signal voltage exceeds the reference voltage, the comparator is reversed. At this time, the peripheral logic circuit of the motor drive is triggered to turn off the power bridge drive. signal, so that the bus current drops rapidly. Current detection methods include pre...

AI Technical Summary

Problems solved by technology

[0005] Aiming at at least one defect or improvement requirement of the prior art, the present invention provides a device for expanding the detection range of a current sensor, the purpose of which is to solve the problem of high circuit cost, Disadvantages of large size

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