Current measuring device and current measuring method thereof

A current measurement device and electrical connection technology, applied in the direction of measurement device, measurement of electrical variables, measurement of magnetic variables, etc., can solve problems affecting current measurement accuracy, increase circuit complexity, high power loss, etc., and achieve automatic magnetic reset, The effect of reducing measurement power consumption and reducing working time

Active Publication Date: 2014-07-09
SIEMENS AG
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Problems solved by technology

However, this solution also has limitations, because the feedback signal cannot accurately reflect the change of the coil inductance. When the measured current changes, the reversal turning point of the magnetic core will also change, which will affect the current measurement accuracy.
In order to increase the current detection range and prevent the turning point from entering the linear region, the turning point should be set as far away from the intersection of the linear region and the nonlinear region as possible, but this will result in higher power loss
At the same time, this scheme requires an amplification device connected to the input terminal of the sampling resistor, which increases the complexity of the circuit

Method used

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  • Current measuring device and current measuring method thereof
  • Current measuring device and current measuring method thereof

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Embodiment Construction

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent components with the same or similar structures but the same functions.

[0029] figure 2 In an exemplary embodiment of the current measuring device of the present invention, it includes a magnetic ring 12 , a coil 10 , a sampling resistor 14 , a driving voltage source 18 , a comparator 16 , a first feedback unit 30 and a second feedback unit 20 .

[0030] The conductor 11 that can pass the current to be measured (direct current or alternating current) passes through the magnetic ring 12, the coil 10 is wound on the magnetic ring 12, the sampling resistor 14 is connected in series with one end of the coil 10, the other end of the coil 10 is connected to the drive voltage source 18 The output terminal can be ...

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Abstract

The present invention provides an apparatus for current measurement, comprising a magnetic ring (12), a coil (10), a sampling resistor (14), a driving voltage source (18), a comparator (16), and a differentiator, and further comprising a first feedback unit (30), which acquires a first feedback signal from the sampling resistor, with the first feedback signal being electrically connectable to an input end of the driving voltage source; and a second feedback unit (20), which can acquire the first feedback signal from said sampling resistor, to obtain a second feedback signal after having the first feedback signal processed differentially, and the second feedback signal being electrically connectable to an input end of the comparator, with an output of the comparator being electrically connectable to another input end of the driving voltage source. The present invention further provides a method for current measurement. In particular, it is the current measurement of a DC or AC current based on the principle of magnetic modulation.

Description

technical field [0001] The present invention relates to a current measuring device and a current measuring method thereof, in particular to a current measuring device and a current measuring method based on the principle of magnetic modulation, which are especially suitable for the measurement of Class B residual current of alternating current and / or direct current. Background technique [0002] The AC and / or DC current test method based on magnetic modulation technology has been widely used, which uses a driving voltage source to alternately set the working state of the magnetic core as figure 1 The linear and nonlinear regions of the magnetic core magnetization curve (also known as hysteresis curve, BH curve, hereinafter referred to as BH curve) are shown, and the intersection point of the linear region and the nonlinear region in the BH curve is judged (as shown by the dotted circle in the figure) is very important, which is beneficial to reverse the output voltage of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/18
CPCG01R33/0041G01R15/185G01R19/20G01R33/0023
Inventor 闵应宗马里奥·丹克特杜峰陈维刚卓越
Owner SIEMENS AG
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