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Closed-loop magnetic balance Hall current sensor

A closed-loop magnetic balance, Hall current technology, applied in the measurement of current/voltage, instruments, measurement of electrical variables, etc., can solve problems such as large zero drift, poor stability and consistency, and affecting system accuracy.

Inactive Publication Date: 2011-12-14
DALIAN FENGHE ELECTRICITY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The closed-loop magnetic balance current sensor has the advantages of high precision and short response time, but in environments with harsh climate conditions (such as wind power systems), the zero point drift is large, especially the zero point drift caused by high temperature and low temperature is particularly serious, resulting in overall The stability and consistency of the system are not good, which seriously affects the accuracy of the system operation, causes system malfunction, and even damages the equipment.

Method used

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  • Closed-loop magnetic balance Hall current sensor
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Embodiment Construction

[0007] The specific implementation manner of the present invention will be described below with reference to the accompanying drawings. Such as figure 1 Shown: Same as the prior art, there is a magnetic ring 1, a primary current input wire 2 is placed in the center of the magnetic ring 1, a Hall element 3 and a compensation coil 4 are arranged on the magnetic ring 1, and the Hall element 3 communicates with the One end of the compensation coil 4 is connected, and the other end of the compensation coil 4 is connected to the load resistor Rm. The amplifying circuit is provided with an operational amplifier IC1 and a power amplifier composed of transistors Q1 and Q2. The Hall element 3 is connected to the operational amplifier through the resistor R1. The negative input terminal of the amplifier IC1 is connected, the Hall element 3 is connected with the positive input terminal of the operational amplifier IC1 through the resistor R2, the output of the power amplifier is fed back ...

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Abstract

The invention discloses a closed-loop magnetic balance Hall current sensor with small zero point drift and fast response speed. The Hall element is connected to one end of the compensation coil through the amplifier circuit, and the other end of the compensation coil is connected to the load resistance Rm. The amplifier circuit is provided with an operational amplifier IC1 and a power amplifier composed of triodes Q1 and Q2. The Hall element passes through The resistor R1 is connected to the negative input terminal of the operational amplifier IC1, the Hall element is connected to the positive input terminal of the operational amplifier IC1 through the resistor R2, and the output of the power amplifier is fed back to the negative input terminal of the operational amplifier IC1 through the zero adjustment circuit FH1.

Description

technical field [0001] The invention relates to a closed-loop magnetic balance Hall current sensor, in particular to a closed-loop magnetic balance Hall current sensor with small zero point drift and fast response speed. Background technique [0002] At present, the known Hall current sensors are all based on the principle of the Hall effect, and there are two types: an open-loop direct measurement type and a closed-loop magnetic balance type. Due to the low accuracy and slow response speed of open-loop direct-measurement Hall current sensors, closed-loop magnetic balance Hall current sensors are often used in wind power, DC motor drives, battery power supplies, and welding machine power supplies. The existing closed-loop magnetic balance current sensor is provided with a magnetic ring, and a primary current input wire is placed in the center of the magnetic ring, and a Hall element and a compensation coil are arranged on the magnetic ring. The Hall element is connected to o...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 冯善军孙友斌金玲洪鹤王志发冯善杰
Owner DALIAN FENGHE ELECTRICITY TECH
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