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Automatic energy-extraction circuit of current transformer

A technology of current transformer and self-energy harvesting, which is applied in the direction of circuit devices, electrical components, electromagnetic wave systems, etc., can solve problems such as low reliability, low energy harvesting efficiency, and wide variation of current transformer current, and achieve voltage stability , the overall loss is small, the effect of strong anti-interference ability

Active Publication Date: 2012-11-21
NARI TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to solve the problems of current transformers such as low current variation, low energy extraction efficiency, and low reliability as soon as possible.

Method used

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  • Automatic energy-extraction circuit of current transformer
  • Automatic energy-extraction circuit of current transformer
  • Automatic energy-extraction circuit of current transformer

Examples

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] Such as figure 1 As shown, the current transformer self-energy harvesting circuit of the present invention is that a winding output of the current transformer 10 is connected to the self-energy harvesting circuit S1, and the self-energy harvesting circuit provides a stable and reliable DC voltage to the load, and the other of the current transformer 10 One winding output is connected to the flux linkage bypass circuit 21 for intermittently bypassing the output flux linkage of the transformer. Its working principle is that as the primary side current of the current transformer changes, the current in the self-energy harvesting circuit S1 and the current in the flux linkage bypass circuit ...

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Abstract

The invention discloses an automatic energy-extraction circuit of a current transformer. According to the energy-extraction circuit, one energy-extraction winding at the output end of the current transformer is connected with the energy-extraction circuit which is used for providing DC voltage to a load, and the other winding at the output end of the current transformer is connected with a magnetic linkage bypass circuit to realize the intermittent magnetic linkage output of a bypass transformer; and the magnetic linkage bypass circuit is connected with and driven by the energy-extraction circuit at the same time. According to the invention, all parts adopt simulation components, the cost is low, the reliability is high and the anti-interference capability is strong. The conservation of the transformer magnetic linage and a principle similar to the pulse width working principle of a switch power are utilized to realize reliable energy extraction of primary-side current width range variation; and the automatic energy-extraction circuit has the advantages of small overall loss, simple structure and high reliability, and overcomes the inherent defects of the current transformer in energy extraction.

Description

technical field [0001] The invention relates to an energy extraction technology on the AC grid side, in particular to a current transformer self-energy acquisition circuit, which belongs to the technical field of power systems. Background technique [0002] Current transformer energy harvesting technology is suitable for some applications where energy supply is inconvenient, such as detection equipment such as leakage current of dirty insulator strings on transmission lines, icing status of wires, temperature of wires and joints, etc. The sending unit, etc. are all near the overhead line, and it is impossible to use a conventional power supply. Current transformer energy harvesting technology is a better way to solve the problem of power supply for such equipment. The working principle of current transformer energy harvesting is to transform the AC current through the transformer. The output of the transformer is usually protected by impact, and then a certain range of DC v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00H02J50/10
Inventor 丁志刚郑玉平周华良夏雨汪世平
Owner NARI TECH CO LTD
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