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Direct current small-current transformer and method for measuring current of direct current small-current transformer

A small current transformer, small current technology, applied in the direction of indicating the existence of current/voltage, etc., can solve the problem of low accuracy and achieve the effect of simple power consumption

Inactive Publication Date: 2014-08-13
南京深科博业电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method of using a shunt and a transmitter, this method has no isolation between the primary and the secondary, there are great safety hazards, and the accuracy is not high

Method used

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  • Direct current small-current transformer and method for measuring current of direct current small-current transformer

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Embodiment Construction

[0025] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Figure 1 to Figure 4 Shown is the structural representation of the present invention.

[0027] The reference signs therein are: annular magnetic iron core 1, winding group 11, DC small current wire 2, waveform generator 3, first resistor 3a, second resistor 3b, third resistor 3c, fourth resistor 3d, the first Five resistors 3e, first loop 31, second loop 32, comparator 33, first measuring terminal 33a, second measuring terminal 33b, power supply 34, single chip microcomputer 4, negative pressure generator 5, negative pressure generating capacitor 51, charge and discharge Circuit 52.

[0028] Such as Figure 1 to Figure 3 As shown, a DC small current transformer of the present invention includes an annular magnetic iron core 1 surrounded by a winding group 11 that can be passed by a DC small current wire 2, wherein the winding group 1...

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Abstract

The invention discloses a direct current small-current transformer which comprises an annular magnetic iron core allowing a direct current small-current wire to penetrate and surrounded by a winding. The winding is connected with a waveform generator. The waveform generator is connected with a single-chip microcomputer and comprises a first circuit, a second circuit and a comparer, wherein the first circuit and the second circuit are connected in parallel and connected with a power source. The two ends of the winding are connected to the first circuit. The first measurement end of the comparer is connected to the first circuit and the second measurement end of the comparer is connected to the second circuit. The comparer can measure the specific value of data through the first measurement end and the second measurement end, so that the current direction of the power source is changed, the waveform generator generates waves with a certain duty ratio, the waves generated by the waveform generator are received by the single-chip microcomputer, and the volume of the current inside the direct current small-current wire is obtained through change of the duty ratio of the waves. The direct current small-current transformer has the advantages of being small in size, high in accuracy, simple in interface, convenient to install and novel in detection method.

Description

technical field [0001] The invention relates to the technical field of electric power measurement, in particular to a DC small current transformer and a method for measuring current thereof. Background technique [0002] In the DC system, the DC leakage current sensor is an indispensable and important component. It detects the DC leakage current of the equipment and is widely used in DC transmission, power storage detection, DC screen, power supply, large medical and health equipment, photovoltaic, wind power In industry equipment such as power generation and communication base stations, the leakage status of the equipment will be fed back at the first time, and the back-end leakage protection and other components will take relevant measures at the first time to avoid accidents and ensure safe use and production operations. [0003] The traditional method of using a shunt and a transmitter, this method has no isolation between the primary and the secondary, has a large safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/15
Inventor 张厚成陈伟韩书波魏丽红卢丹
Owner 南京深科博业电气股份有限公司
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