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Method for testing direct current by quadrature transformer

A DC current and transformer technology, applied in the electrical field, can solve problems such as inability to detect DC current, and achieve accurate detection results

Active Publication Date: 2010-05-12
CHANGCHUN INST OF TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Using a current transformer to detect current is a mature method, and there is no temperature drift problem of semiconductor devices, but this method can only be used for the detection of AC current, and cannot be used for DC current detection

Method used

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  • Method for testing direct current by quadrature transformer
  • Method for testing direct current by quadrature transformer
  • Method for testing direct current by quadrature transformer

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, block 1 is a current pickup unit composed of an orthogonal transformer combined with a standard shunt, also known as a sensitive head. The function of the sensitive head is to convert the current signal into a magnetic permeability signal, and then convert the magnetic permeability signal into a coil inductance (signal); the unit circuit shown in block 2 converts the changed inductance signal sent by block 1 It is converted into a changing frequency signal; the block 3 circuit converts the frequency signal sent from the upper stage into a standard output voltage signal (0-5V).

[0020] The signal output by block 3 can be used in the control system as a current signal, and can also be directly output as a current indication signal.

[0021] Such as figure 2 As shown, the circuit is an actual experimental circuit for DC current detection below 30A. The shunt and the sensitive head are connected together, and the sensitive head is an orthogona...

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PUM

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Abstract

The invention discloses a method for detecting direct current of a quadrature transformer, belonging to the electric technical field. The method is as follows: the quadrature transformer converts current signals into inductance signals and transmits the inductance signals to a converting circuit which converts the inductance signals into frequency signals and transmits the frequency signals to a processing circuit which outputs standard voltage signals or standard current signals. The invention has the advantages of solving the problem of temperature drift of a semiconductor device used in current detection, overcoming the drawbacks of a Hall current sensor, along with more accurate and convenient detection and detection of direction current.

Description

technical field [0001] The invention belongs to the field of electrical technology. Background technique [0002] At present, the current detection method is used for current detection components of electrical control and current measurement. The technology is relatively mature and widely used, mainly using the Hall current sensor. It is a current detection element designed according to the Hall effect of semiconductor materials. This sensor can be used for both DC current detection and AC current detection. At present, Hall current sensors are widely used. This type of sensor has a complete range of varieties and specifications, and can detect DC and AC currents. [0003] There is also a more traditional method, which is to use a current transformer for current detection, which is currently only used for the detection of alternating current. The current detection using this method is more suitable for power frequency (50H z ) and the case of high current with low frequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R19/32G01R19/25G01R19/252G01R15/00
Inventor 周文良
Owner CHANGCHUN INST OF TECH