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Alternating-current sampling device

A technology of AC sampling and sampling unit, applied in the direction of using digital measurement technology for measurement, etc., can solve the problems of low accuracy, large influence of processing circuit, large interference of electrical signals, etc., and achieve high conversion efficiency, low gain error, and interference suppression. Effect

Inactive Publication Date: 2016-06-08
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is that there is large interference in the electrical signal collected by the transformer, the accuracy is low, and the impact on the subsequent processing circuit is large

Method used

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Examples

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Embodiment 1

[0040] like figure 1As shown, this embodiment provides an AC sampling device, including:

[0041] The sampling unit 1 collects the current signal and voltage signal of each phase of the three-phase power grid;

[0042] The processor unit 2 receives and processes the current signal and the voltage signal collected by the sampling unit 1;

[0043] The power supply unit 3 provides electric energy for the sampling unit 1 and the processor unit 2;

[0044] Wherein, the sampling unit 1 includes a voltage sampling circuit and a current sampling circuit, and the current sampling circuit includes a current transformer 11, an electrical signal processing circuit 12 and a differential amplifier circuit 13 connected in sequence;

[0045] The electrical signal processing circuit 12 includes resistors R39, R40, R45 and capacitors C109, C113. One end of the resistor R40 is connected to an input end of the differential amplifier circuit 13 through the resistor R39, and the other end of the ...

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Abstract

The invention provides an alternating-current sampling device which comprises a sampling unit and a processor unit. The processor unit receives and processes current signals and voltage signals collected by the sampling unit. The sampling unit comprises a voltage sampling circuit and a current sampling circuit. The current sampling circuit comprises a current transformer, an electric signal processing circuit and a differential motion amplifying circuit which are connected in sequence. The electric signal processing circuit comprises a resistor R39, a resistor R40, a resistor R45, a capacitor C109 and a capacitor C113. One end of the resistor R40 is connected with one input end of the differential motion amplifying circuit through the resistor R39, and the other end of the resistor R40 is connected with the other input end of the differential motion amplifying circuit through the resistor R45. One end of the capacitor C109 is connected with one input end of the differential motion amplifying circuit, and the other end of the capacitor C109 is grounded. One end of the capacitor C113 is connected with the other input end of the differential motion amplifying circuit, and the other end of the capacitor C113 is grounded. The connecting position of the resistor R40 and the resistor R39 is connected with one output end of the current transformer, and the connecting position of the resistor R40 and the resistor R45 is connected with other output end of the current transformer.

Description

technical field [0001] The invention relates to the technical field of electrical signal sampling, in particular to an AC sampling device. Background technique [0002] Electrical signal sampling is to convert an analog current signal or analog voltage signal that is continuous in time and amplitude into a discrete analog signal that is discrete in time (there is a fixed interval in time) but still continuous in amplitude under the action of the sampling pulse. Signal. [0003] In the microcomputer control device, an electrical signal acquisition module is often used to convert the analog electrical signal into a digital signal that the microprocessor can recognize. For signal acquisition of large alternating currents such as three-phase power grids, transformers are generally used to convert large currents into small currents, and then the collected electrical signals are filtered and amplified through the sampling conditioning circuit to input non-interfering and appropri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 于乔王奉冲汤磊李孟
Owner STATE GRID SHANDONG ELECTRIC POWER
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