Method for measuring direct current greater than 50A

A DC current and current technology, applied in the measurement of current/voltage, measurement of electrical variables, measurement devices, etc., can solve the problem of difficult to calculate the synthesis error, and achieve the goal of reducing measurement power consumption, improving measurement accuracy, and overcoming nonlinear problems. Effect

Inactive Publication Date: 2015-09-09
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the different errors produced under different conditions, most manufacturers of linear Hall effect devices decompose the total error into many individual components, and it is sometimes difficult to calculate the total combined error

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] A method for measuring a DC current above 50A described in this embodiment is to measure the conductor current to be measured by detecting the presence or sign of the magnetic field in the magnetic core of the Hall current sensor instead of measuring the strength of this magnetic field. Measurement errors due to unstable excitation current in the Hall element can be avoided.

[0025] In the method for measuring a DC current above 50A described in this embodiment, a winding is added to the magnetic core of the Hall current sensor, and the winding is used to generate a magnetic field with an opposite sign, and the magnetic field strength is the same as that generated by the current to be measured. The magnetic fields are exactly equal. Moreover, the winding is connected to a circuit containing an operational amplifier, and the circuit can maintain the current of the winding and make the magnetic field sensed by the Hall current sensor zero. At the same time, when making ...

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Abstract

The invention discloses a method for measuring direct current greater than 50A, and relates to the field of high current measurement. A Hall current sensor measuring high current is used. The Hall effect sensor is internally provided with a current carrying element. A winding is additionally arranged on the magnetic core of the Hall current sensor. The winding is used for generating a magnetic field which is opposite in symbol, and magnetic field intensity is completely equal to the magnetic field generated by current to be measured. Conductor current to be measured is measured by detecting existence of the magnetic field in the magnetic core or detecting the symbol so that a measurement error caused by unstable excitation current in the Hall element can be avoided. The nonlinear problem of the Hall sensing element can be overcome by the method so that measurement power consumption is reduced. Besides, a precise shunting resistor is used so that measurement precision is enhanced.

Description

technical field [0001] The invention relates to direct current measurement, especially the field of large current measurement of 50A and above, specifically a method for measuring direct current above 50A. Background technique [0002] With the development of loads such as electric vehicles (EV), grid energy storage, and photovoltaic (photovoltaic) renewable energy devices, the DC current range above 50A is typical for loads such as electric vehicles, grid energy storage, and photovoltaic (photovoltaic) renewable energy devices. value. [0003] These systems need to accurately predict the state of charge (SOC) of the associated energy storage battery. Estimation of the state of charge can be achieved from current and charge (coulomb counting) measurements, and accurate measurement data is necessary for accurate state of charge estimation. In general, any system designed for current or charge measurements includes built-in data acquisition components such as appropriate amp...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 肖波滕学军谷俊杰高鹏飞车吉旭
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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