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Current measuring circuit

A technology of current measurement circuit and rectification circuit, which is applied in the direction of measurement using digital measurement technology, can solve problems such as inaccurate measurement, and achieve the effect of reducing manufacturing costs

Inactive Publication Date: 2014-10-15
UNI TREND TECH (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, this application provides a current measurement circuit to solve the problem that the existing non-contact current measurement device cannot measure accurately when measuring a large current due to the phenomenon of magnetic saturation

Method used

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Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0052] figure 1 A block diagram of a current measurement circuit provided for the embodiment of this application

[0053] Such as figure 1 The shown measuring circuit includes: a current sensor 101, an amplifying circuit 102, a filter circuit 103, a rectifying circuit 104 and an analog-to-digital conversion circuit 105; wherein the output terminal of the current sensor 101 is connected with the input terminal of the amplifying circuit 102, and the output terminal of the amplifying circuit ...

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Abstract

The application discloses a current measuring circuit comprising a current sensor. The current sensor is provided with at least one coil. The coil has a hollow tube structure formed by a conductive wire via coiling in a certain direction. The coil has no iron core material so that the magnetic saturation phenomenon does not occur. Induced voltage outputted by the current sensor and the measured current are constantly in a linear relation so that a problem that relatively high current cannot be accurately measured by existing non-contact type current measuring devices due to the magnetic saturation phenomenon is solved. Meanwhile, the situation that equipment and personnel safety are influenced by strong shock generated by the effect of alternating magnetic field force due to the fact that the iron core with high magnetic permeability is magnetized into a magnet in the magnetic field when the existing non-contact type current measuring devices measure high current is avoided. Besides, the current measuring circuit disclosed by the application does not use the iron core material so that manufacturing cost can be reduced to some extent.

Description

technical field [0001] The present application relates to current measurement technology, and more specifically, to a current measurement circuit. Background technique [0002] The basic principle of the non-contact current measurement device is to use the current sensor to obtain the induced current, and the back-end sampling circuit calculates the measured current value by measuring the intensity of the induced current. Current sensors in existing non-contact current measuring devices mainly include iron core + Hall element type and iron core + coil type, and their common characteristics are: they are all made of high magnetic permeability materials such as silicon steel or permalloy The iron core acts as a flux loop for the measured current and magnetic field. [0003] For an iron core of a certain shape and volume, its ability to gather a magnetic field is limited, and the magnetic flux passing through it will have a limit value, that is, a magnetic saturation phenomeno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 赵辉谢添富严继东李炳英周利勤
Owner UNI TREND TECH (CHINA) CO LTD