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Current and voltage conversion circuit

A current-voltage conversion and circuit technology, applied in the direction of measuring current/voltage, measuring current only, voltage/current isolation, etc., can solve the problems of low sensitivity and unsuitable for measuring small current, so as to reduce test deviation and improve effective current measurement. frequency range, the effect of reducing adverse effects

Pending Publication Date: 2022-05-10
中船西安东仪科工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic modulator current sensor can only be used to measure DC current, and the bandwidth of the fluxgate current sensor is only a few kHz; the bandwidth of the magnetic flux gate and giant magnetic effect current sensor usually does not exceed 1Mz; Low, not suitable for measuring small currents

Method used

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Comparison scheme
Effect test

Embodiment 1

[0030] Please refer to figure 2 , which shows the electrical schematic diagram of the first embodiment of the present invention, the current-voltage conversion circuit, the current-voltage conversion circuit includes a current transformer and a first operational amplifier, the first operational amplifier is connected to a negative feedback resistor, Connected to the secondary side of the current transformer, the first operational amplifier and the negative feedback resistor convert the secondary side current of the current transformer of the current-voltage conversion circuit into a voltage signal for output.

[0031] The self-stable capacitor is an isolation DC capacitor C1.

[0032] The current-voltage conversion circuit further includes an auto-zero capacitor used to suppress the influence of the offset voltage of the first operational amplifier, and the auto-zero capacitor is connected to the inverting input terminal of the first operational amplifier and the current tran...

Embodiment 2

[0056] Further, such as image 3 As shown, another embodiment of the current-voltage conversion circuit of the present invention, the current-voltage conversion circuit further includes a first operational amplifier auto-zero circuit for suppressing the influence of the offset voltage of the first operational amplifier.

[0057] The self-stable zero circuit of the operational amplifier includes a second operational amplifier, a first resistor R1, a second resistor R2 and a third capacitor C3, the reverse input terminal of the second operational amplifier is connected to one end of the first resistor R1, and the first resistor R1 is connected to another One end is connected to the output terminal of the first operational amplifier, the non-inverting output terminal of the second operational amplifier is respectively connected to one end of the third capacitor C3 and the non-inverting input terminal of the first operational amplifier, and the other end of the third capacitor C3 i...

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Abstract

The invention discloses a current and voltage conversion circuit, and belongs to the field of electronic technology and metering measurement, the current and voltage conversion circuit comprises a current transformer and a first operational amplifier, the first operational amplifier is connected with a negative feedback resistor and is connected with the current transformer, and the negative feedback resistor is connected with a second operational amplifier. And the first operational amplifier and the negative feedback resistor convert the secondary side current of the current transformer of the current-voltage conversion circuit into a voltage signal and output the voltage signal. The first operational amplifier is used in a reverse connection mode, the output voltage of the mutual inductor is restrained to be close to zero, the adverse effects of the inductance value and distributed capacitance of the mutual inductor are reduced, and compared with a current mutual inductor and resistor method, the current effective measurement frequency range can be economically improved, and the test deviation is reduced.

Description

technical field [0001] The invention belongs to the field of electronic technology and measurement and measurement, and in particular relates to a current-voltage conversion circuit. Background technique [0002] Due to various reasons, it is necessary to measure the current in the circuit, but it is difficult to directly perform AD conversion or measure the current with a voltmeter, oscilloscope and other instruments. Usually, it needs to be converted into a voltage signal first, and then perform AD conversion or measure with a voltmeter, oscilloscope and other instruments. A circuit or device that converts current to voltage is also called a current sensor. The introduction of the sensor should not have a significant impact on the original electrical circuit, ideally without any impact. [0003] At present, there are mainly technical approaches such as sampling resistors, current transformers, and Hall sensors to realize the conversion of current into voltage signals. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/0092G01R15/18
Inventor 苗洪涛于洋王健王凯刘琳芝张元元
Owner 中船西安东仪科工集团有限公司