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Current detector

A current detector and current technology, used in voltage/current isolation, instruments, measuring devices, etc., can solve the problems of high price and unsuitable yield, and achieve the effect of reducing material costs and usage.

Active Publication Date: 2013-01-23
TAMURA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the permalloy material itself is expensive, there is a problem that it is not suitable for shapes with poor yields such as relatively large cores or laminated cores.

Method used

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no. 1 approach

[0029] figure 1 It is a perspective view showing that the current detector 100 of the first embodiment is disassembled into constituent elements. The current detector 100 has a resin case 102 in which sheet-shaped chip cores 104 and 106 are housed in a stacked state. These sheet cores (sheet cores) 104 and 106 constitute one magnet core 108 in a state housed in the resin case 102 . In addition, although in figure 1 In FIG. 2 , two sheet cores 104 and 106 are shown, but the actual number is more than that, and the illustration is omitted.

[0030] Both the chip cores 104 and 106 are formed in a substantially square C-shape, and the chip cores 104 and 106 in such a shape are formed by punching out a plate-shaped magnetic material. At this time, each of the sheet cores 104, 106 has openings 104a, 106a formed at the center thereof, and gap slits 104b, 106b extending from the openings 104a, 106a toward one edge. The openings 104a and 106a are substantially angular in accordance...

no. 5 approach

[0079] Figure 7 It is a perspective view showing that the current detector 150 of the fifth embodiment is disassembled into constituent elements. The current detector 150 of the fifth embodiment also has the magnet core 108 formed by stacking multiple types of chip cores 204 and 206 , but the magnetic materials of the chip cores 204 and 206 are different from those of the first to fourth embodiments. That is to say, the sheet cores 104 and 106 listed in the first to fourth embodiments are all sheet cores made of grain-oriented silicon steel sheets. In the fifth embodiment, the sheet core 204 on one side is made of iron-nickel alloy (such as PB=45% permalloy, PC=78% permalloy) as material, and the sheet core 206 on the other side is made of non-oriented silicon steel board as material.

[0080] In this case, the sheet core 206 is a non-oriented silicon steel sheet, and although there is a portion having poor magnetic properties (especially hysteresis width) as a magnetic cor...

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Abstract

A current detector (100) has a magnetic core (108) having a structure in which two kinds of sheet cores (104, 106) whose easy magnetization directions are different from each other are laminated. By adopting such a laminate structure, the whole magnetic core (108) is capable of exhibiting good magnetic characteristics. An output voltage from a Hall element (110) exhibits good linearity with respect to a current to be detected. Further, unlike a conventional toroidal type core, man-hour and time which are required for processing are reduced, which accordingly can hold manufacturing cost down.

Description

technical field [0001] The present invention relates to a magnetic proportional current detector used for measuring or detecting current. Background technique [0002] As a prior art related to such a current detector, there is known a current sensor that uses a Hall element to convert a magnetic field generated by a detected current into a voltage, and indirectly detects a current value (for example, refer to JP 2003 -17347 communique, Japanese Patent Application Laid-Open No. 9-281152). These known current sensors have a core (core) constituting a magnetic circuit, and a Hall element is arranged in a gap (gap) formed in the core. Due to the detected current, the magnetic field generated inside the magnetic core rotates through the gap, and is converted into a voltage signal by the Hall element. [0003] As shown in these prior arts, the magnetic core of the current sensor adopts a toroidal or laminated magnetic core. Among them, firstly, a strip-shaped magnetic material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/20
CPCG01R15/202
Inventor 安齐浩小林正和
Owner TAMURA KK