JPH0653979U - Current detector - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims at a current detection device capable of reducing noise. A magnetic material 11 having a gap is surrounded by a non-magnetic conductive resin 12 having conductivity, and a notch 13 is provided so that the magnetoelectric conversion element 3 can be inserted therein. The core 1 having the fixing hole 14 formed therein is coupled to the printed board 2 having the pattern 21 formed in the core mounting hole 22 with the screw 4 or the like to electrically connect the printed board 2 and the conductive resin 12, and The feature is that the positions of the conversion element 3 and the magnetic gap are also determined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a current detection device used for battery current detection and the like.

[0002]

[Prior art]

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

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, the noise on the printed circuit board 2 is dealt with by the members in the circuit and the wiring, and particularly when the countermeasure is taken by the wiring shape (ground strengthening), the size of the printed circuit board is restricted. There is a problem that it is not possible to deal with noise sufficiently.

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

Therefore, the present invention was devised in view of the problems of the above-mentioned conventional techniques, and an object of the present invention is mainly to provide a current detection device capable of reducing noise.

[0006]

[Means for Solving the Problems]

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

[0007]

[Action]

 Since the ground part of the printed circuit board is in electrical contact with the core with screws, noise can be reduced.

Further, since the core has the fixing hole, the core can be easily fixed to the printed board.

[0009]

【Example】

 An embodiment will be described with reference to FIG. 1. In a core 1, a magnetic body 11 provided with a gap is disposed inside, and a non-magnetic body having conductivity, for example, a conductive resin 12 such as a metal mesh resin is used. Is formed so as to be surrounded by.

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

The printed circuit board 2 is provided with a core mounting hole 22, a pattern 21 extending from the ground pattern portion is provided around the core mounting hole 22, and the magnetoelectric conversion element 3 is mounted at a predetermined position. ing.

Further, the core mounting hole 22 of the printed circuit board 2 and the fixing hole 14 of the core 1 are fixed by screwing 4 together.

At this time, the pattern 21 which is an extension of the ground pattern is not coated with an insulating film or the like in order to maintain the conductivity with the core 1 through the screw 4.

Then, the core mounting hole 22 of the printed circuit board 2 and the fixing hole 14 of the core 1 are fixed with screws 4 to electrically connect the printed circuit board 2 and the conductive resin 12.

Further, when the screw 4 is fixed, the positions of the magnetoelectric conversion element 3 and the magnetic substance gap are also determined.

[0016]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. A. Noise is reduced because the ground part of the printed circuit board is in electrical contact with the core with the screw.

B. Since the core has holes for fixing, the core can be easily fixed to the printed circuit board.

[Brief description of 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]

 1 core 11 magnetic substance 12 conductive resin 13 notch 14 fixing hole 2 printed circuit board 21 pattern 22 core mounting hole 3 magnetoelectric conversion element 4 screw

Claims (1)

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