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Current sensing element and power transmission system

A current detection and component technology, applied in electrical components, voltage/current isolation, circuits, etc., can solve the problems of increased component size and low height of the converter, and achieve the effect of strong magnetic field coupling and high sensitivity

Active Publication Date: 2020-08-21
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the size of the parts will increase, so it may be difficult to use the converter in a device that requires a smaller size and lower height.

Method used

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  • Current sensing element and power transmission system
  • Current sensing element and power transmission system
  • Current sensing element and power transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] figure 1 (A) is a plan view of the current detection element 1, figure 1 (B) is figure 1 (A) Cross-sectional view at line I-I. in addition, figure 1 The top view shown in (A) is a perspective view.

[0047] The current detection element 1 includes a laminated body 10 , a main line electrode 11 , and a coil conductor 12 . The laminated body 10 is an insulator in which a plurality of insulator layers are stacked, and is formed by sintering. The insulator layer includes an insulator layer made only of a magnetic material such as ferrite and an insulator layer made of a magnetic material and a non-magnetic material. The magnetic body is a strong magnetic body, and the relative permeability μ r >1. The magnetic permeability of the non-magnetic body is lower than that of the surrounding magnetic body, and the relative magnetic permeability μ r=1. When these insulator layers are stacked, in the laminated body 10 , the high magnetic permeability portion is formed of a ...

Embodiment approach 2

[0069] In the current detection element according to the second embodiment, the size of the low magnetic permeability portion is different from that of the first embodiment.

[0070] Figure 4 (A) is a top view of the current detection element 2, Figure 4(B) is Figure 4 (A) Cross-sectional view at line IV-IV. in addition, Figure 4 The top view shown in (A) is a perspective view.

[0071] The laminated body 10A of the current detection element 2 is formed by laminating and sintering an insulator layer composed only of a ferromagnetic material such as ferrite and an insulator layer composed only of a nonmagnetic material. By laminating an insulator layer composed only of a nonmagnetic material, the low magnetic permeability portion 14 of the nonmagnetic material layer is formed in the laminated body 10A. Further, insulator layers made of only ferromagnetic materials are stacked along the stacking direction so as to sandwich the low magnetic permeability portion 14 thereb...

Embodiment approach 3

[0076] The current detection element according to Embodiment 3 differs from Embodiment 1 in that it includes two coil conductors for detecting current.

[0077] Figure 5 (A) is a plan view of the current detection element 3, Figure 5 (B) is Figure 5 (A) Cross-sectional view at line V-V.

[0078] The current detection element 3 is provided with the laminated body 20, the electrode 21 for main lines, and coil conductor 22A, 22B. The laminated body 10 is formed by laminating and firing a plurality of insulator layers. The insulator layer includes an insulator layer made only of a ferromagnetic material such as ferrite and an insulator layer made of a ferromagnetic material and a nonmagnetic material. When these insulator layers are stacked, the low magnetic permeability portion 24 whose magnetic permeability is lower than that of the surrounding area is formed in the laminated body 20 by a non-magnetic material.

[0079] The main line electrode 21 is formed in the low mag...

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Abstract

The present invention comprises: a laminated body (10) laminated with a plurality of insulator layers including a magnetic layer; a main line electrode (11) formed on the laminated body (10); and a coil conductor (12) formed on the laminated body ( 10), and conduct magnetic field coupling with the main line electrode (11). The laminated body (10) has a low magnetic permeability part (13), which is provided between the main line electrode (11) and the coil conductor (12), and has a lower magnetic permeability than the surrounding area. The low magnetic permeability portion (13) is in contact with at least one of the main line electrode (11) or the coil conductor (12). Accordingly, there are provided a current detection element capable of downsizing and capable of detecting current with high sensitivity, and a power transmission system including the current detection element.

Description

technical field [0001] The present invention relates to a current detection element and a power transmission system for detecting a high-frequency current flowing in a line. Background technique [0002] As an element that detects the current flowing in a line, for example, a current transformer is known. Converters usually consist of a transformer wound around a toroidal core. Therefore, the size of the components increases, and it may be difficult to use the converter in devices that require a smaller size and lower height. Therefore, as an example of a small and thin transformer, there is a laminated transformer described in Patent Document 1, for example. The multilayer transformer described in Patent Document 1 is a surface mount electronic component in which magnetic sheets on which conductive patterns are printed are laminated to form a transformer. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18H01F17/00H01F38/14H01F38/30H02J50/00
CPCG01R15/18H01F38/30H02J50/005
Inventor 市川敬一
Owner MURATA MFG CO LTD
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