JP2592761Y2 - Current detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device used for detecting a current of a battery.

[0002]

2. Description of the Related Art Conventionally, in a current detecting device, as shown in FIG. 2, a printed circuit board 2 and a core 1 are formed separately, and there is no electrical connection. Reference numeral 3 denotes a magnetoelectric conversion element disposed in the gap of the core 1.

[0003]

However, in the above-mentioned conventional technique, noise on the printed circuit board 2 is counteracted by members and wiring in the circuit. However, there is a problem that the size of the printed circuit board is limited and sufficient noise control cannot be performed.

There is another problem that it is difficult to mount the core 1 on the printed circuit board 2. Further, when a filter or the like is used as a noise countermeasure, there is a problem that the cost is increased.

Accordingly, the present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a current detection device capable of mainly reducing noise.

[0006]

In order to achieve the above object, in the current detecting device according to the present invention, a magnetic material having a gap is surrounded by a conductive resin of a non-magnetic material having conductivity. A core provided with a notch so that the magnetoelectric conversion element can be inserted therein, and a fixing hole provided in the conductive resin portion is coupled to a printed circuit board having a pattern formed in the core mounting hole with a screw or the like, and the printed circuit board is electrically conductive with the printed circuit board. It is characterized in that the resin is electrically connected and the position of the gap between the magnetoelectric conversion element and the magnetic material is also determined.

[0007]

Since the ground portion of the printed circuit board is electrically connected to the core by screws or the like, noise can be reduced.

Further, since the fixing holes are provided in the core, the core can be easily fixed to the printed circuit board.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIG.
The core 1 is formed in such a manner that a magnetic body 11 provided with a gap is disposed inside, and the magnetic body 11 is surrounded by a conductive nonmagnetic material, for example, a conductive resin 12 such as a resin with a metal mesh.

The core 1 is provided with a cutout 13 in a part so that the magnetoelectric conversion element 3 can be inserted, and a fixing hole 14 is provided in the conductive resin 12.

On the printed circuit board 2, a core mounting hole 22 is provided, a pattern 21 extending from the ground pattern portion is provided around the core mounting hole 22, and the magneto-electric conversion element 3 is mounted at a predetermined position. .

The core mounting hole 2 of the printed circuit board 2
2 and the fixing hole 14 of the core 1 are connected by screwing 4.

At this time, since the pattern 21, which is an extension of the ground pattern, maintains conductivity with the core 1 through the screw 4, an insulating film or the like is not applied.

The core mounting hole 22 of the printed circuit board 2
The printed circuit board 2 and the conductive resin 12 are electrically connected to each other by screwing the fixing hole 14 of the core 1 with the screw 4.

When the screw 4 is fixed, the position of the gap between the magnetoelectric conversion element 3 and the magnetic body is also determined.

[0016]

Since the present invention is configured as described above, the following effects can be obtained. A. Since the ground portion of the printed circuit board is electrically connected to the core by the screw, noise can be reduced.

B. Since the fixing holes are provided in the core, the core can be easily fixed to the printed circuit board.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of a conventional current detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core 11 Magnetic body 12 Conductive resin 13 Notch 14 Fixing hole 2 Printed circuit board 21 Pattern 22 Core mounting hole 3 Magnetoelectric conversion element 4 Screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01R 15/20

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic body provided with a gap is surrounded by a conductive resin of a non-magnetic material having conductivity, a notch is provided so that a magneto-electric conversion element can be inserted, and the notch is fixed to the conductive resin portion. The holed core is connected to a printed circuit board with a pattern formed in the core mounting hole with screws, etc., to electrically connect the printed circuit board and the conductive resin, and also to determine the position of the magnetoelectric conversion element and the magnetic material gap. A current detector, characterized in that: