JP2003194857A - Current detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic balance type current detector being inexpensive to be machined while improving assembly processes. <P>SOLUTION: In the current connector, a bobbin is provided with a pair of terminals to which the ends of conductors forming a coil body are connected, and a plurality of terminals for electrical and mechanical connection to a circuit board. A core made of a ferromagnetic substance forming a closed magnetic circuit including a magnetic gap comprises a pair of approximately U-shaped core pieces butted together to form the closed magnetic circuit including the magnetic gap. The terminals of the bobbin and a magnetic sensitive element are securely connected to respective mounting positions provided on the circuit board, whereby the circuit board and the magnetic sensitive element are fixed on the bobbin. Also, the coil wound on the bobbin is electrically connected by wiring provided on the circuit board, and the plurality of terminals disposed on the bobbin for electrical and mechanical connections are used as input and output terminals. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic balance type current detector for detecting direct current and pulse current used in various industrial equipment, power equipment, electric appliances, electronic equipment, etc. The present invention relates to a current detector preferably used for current detection in a power plant.

[0002]

2. Description of the Related Art A conventional general magnetic balance type current detector will be described. FIG. 7 shows a conventional magnetic balance type current detector. FIG. 7 (a) is a front view, FIG. 7 (b) is a side view, FIG. 7 (c) is a top view, and FIG. 7 (d) is a bent core. FIG. The magnetic balance type current detector of FIG. 7 has a pair of cores having a magnetic gap 802 in combination as a magnetic core.
The current detector is configured by disposing the secondary coil and the primary coil on the bobbin.

In FIG. 7, 101 is a bobbin and 102
a, 102b are core pieces, 103 is a circuit board, 104a, 104b, 104c, 104d are input / output terminals, 105 is a primary coil, and 105 'is 1
A secondary coil terminal, 106 is a secondary coil, and 10
7 is an insulating tape.

FIG. 8 is an explanatory view of a circuit board of a conventional magnetic balance type current detector. 8A is a front view, FIG. 8B is a plan view, and FIG. 8C is a side view. In FIG. 8, 701 is a SIP type Hall element.

[0005]

However, in the above-mentioned magnetic balance type current detector, in order to connect the lead terminal of the SIP type Hall element to the circuit board, the lead is passed through the board hole and soldered by hand. Was needed. Also, in order to connect the input / output terminals to the circuit board,
Steps such as inserting terminals, soldering, and cutting were required for each board. Due to these steps, the processing cost becomes high and the current detector itself becomes expensive.

Therefore, an object of the present invention is to provide a magnetic balance type current detector which has an improved assembly process and is inexpensive to process.

[0007]

In order to solve the above technical problems, in the current detector of the present invention, a core made of a ferromagnetic material forming a closed magnetic circuit including a magnetic gap, and a bobbin accommodating the core. A secondary coil wound on the bobbin, a primary coil wound from above the coil, a magnetic sensitive element disposed in the magnetic gap, and a circuit board. In the container, the bobbin is provided with a pair of terminals to which ends of conductive wires forming the secondary coil body are respectively connected, and a plurality of terminals for electrically and mechanically connecting to the circuit board. The core made of a ferromagnetic material in which a closed magnetic path including the magnetic gap is formed is formed by forming a closed magnetic path including the magnetic gap by abutting a pair of the substantially U-shaped core pieces. Of the bobbin The circuit board and the magnetic sensitive element are fixed on the bobbin by connecting and fixing the terminals and the magnetic sensitive element to the mounting positions provided on the circuit board, respectively. The coil wound around the bobbin is electrically connected by the wiring, and a plurality of electrically and mechanically connected terminals arranged on the bobbin are used as input / output terminals. It is characterized by that.

Further, it is characterized in that centering axes of the primary coil and the secondary coil wound around the bobbin are arranged parallel to a vertical direction of the circuit board. In addition, adjacent end surfaces of the core are each processed into a flat plate shape and through holes are provided, and the through holes provided at the adjacent end portions of the core are overlapped with each other to form a pin structure and a rivet structure. Alternatively, it is characterized in that the end portions are connected and fixed by an eyelet structure.

That is, according to the present invention, a core made of a ferromagnetic material forming a closed magnetic circuit including a magnetic gap, a bobbin around which a secondary coil is wound, and a primary coil wound over the secondary coil. In a current detector including a coil, a magnetic sensitive element arranged in the magnetic gap, and a circuit board, the bobbin is connected to an end portion of a conductive wire forming the secondary coil body. A pair of terminals and a plurality of terminals for electrically and mechanically connecting to the circuit board, and the core made of a ferromagnetic material forming a closed magnetic path including the magnetic gap is abutted in a pair. The core piece is formed by forming a closed magnetic path including a magnetic gap, and the terminal of the bobbin and the magnetic sensitive element are respectively connected and fixed to the mounting positions provided on the circuit board. By that, The circuit board and the magnetic sensitive element are fixed to the bobbin, and the secondary coil wound around the bobbin is electrically connected by the wiring provided on the circuit board, and the secondary coil is disposed on the bobbin. Is a current detector configured to use a plurality of connected terminals as input / output terminals.

In the current detector of the present invention, the central axes of the primary coil and the secondary coil wound around the bobbin are arranged parallel to the vertical direction of the circuit board. It is a current detector.

According to the present invention, in the current detector, the end portions of the core piece adjacent to each other are machined into flat plates, and the end portions are provided with through holes.
In the current detector, the through holes are overlapped with each other and the end portions are connected and fixed by a pin structure, a rivet structure or an eyelet structure.

According to the present invention, in the current detector, the primary coil wound from above the secondary coil is three.
The current detector is composed of layer-insulated electric wires, and each end of the current detector is fixed to the bobbin by press fitting, heat caulking, or adhesion to the bobbin.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A current detector according to an embodiment of the present invention will be described below.

FIG. 1 is an explanatory diagram of a magnetic balance type current detector according to an embodiment of the present invention. FIG. 1A is a front view, and FIG. 1B is a side view.

In FIG. 1, 201 is a circuit board, and 20
Reference numeral 2 is a magnetoelectric conversion element, 203a and 203b are core pieces, and 204a and 204b are through-hole terminals for secondary coil connection formed on the circuit board 201.
Reference numeral 05 is a bobbin, 206 is a secondary coil wound on the bobbin 205, 207 is an insulating tape covering the secondary coil 206, and 208 is a primary coil.
Reference numeral 208 'denotes a primary coil terminal, which is 209a, 209
Reference numerals b, 209c and 209d denote input / output through-hole terminals formed on the circuit board 201.

Further, 301a and 301b are bobbins 20
5 is an L-shaped pin terminal for connecting the secondary coil, which is inserted into the through-hole terminal for connecting the secondary coil. Also, 302a, 302b, 302c, 302
Reference numeral d denotes an input / output L-type pin terminal formed on the bobbin 205, and the input / output through-hole terminals 209a, 2
09b, 209c, 209d.

FIG. 2 is an explanatory view of the bobbin of the magnetic balance type current detector according to the embodiment of the present invention. Here, FIG.
2A is a front view, and FIG. 2B is a side view.

FIG. 3 is an explanatory view showing a state in which the bobbin of the magnetic balance type current detector according to the embodiment of the present invention is wound. Here, FIG. 3A is a front view and FIG.
(B) is a side view.

FIG. 4 is an assembly diagram of the core, coil, and bobbin of the magnetic balance type current detector according to the embodiment of the present invention. Here, FIG. 4A is a front view and FIG. 4B is a side view.

As shown in FIG. 2, the bobbin is an L-shaped pin terminal 301a, 302b for connecting a secondary coil and an L for input / output.
It is a hollow resin molded product having mold pin terminals 302a, 302b, 302c, 302d. 2 on the bobbin of FIG.
The secondary coil 206 is wound, and the insulating tape is wound on the secondary coil 206.
Wrap 8 Both ends of the secondary coil are L-shaped pin terminals 301a for connecting the secondary coil, which are arranged on the bobbin.
Solder connection to 301b. Both ends of the primary coil are
It is fixed to the bobbin by means such as heat crimping or adhesion. On the completed coil body, as shown in Fig. 4,
The core pieces 203a and 203b are arranged and fixed with eyelets 502.

FIG. 5 is an explanatory diagram of the core of the magnetic balance type current detector according to the embodiment of the present invention. 5A is a plan view of one core piece 203b, FIG. 5B is a plan view of the other core piece 203a, and FIG.
It is a top view which combined the core piece of (a), and the core piece of FIG.5 (b). As shown in FIG. 5, the core has a structure in which a proper magnetic gap 801 is formed in combination.

FIG. 6 is an explanatory diagram of a circuit board of the magnetic balance type current detector according to the embodiment of the present invention. As shown in FIG. 6, it has an SMT type magnetoelectric conversion element 202.
A pattern is formed in advance on the circuit board 201, and the through-hole terminals 204a and 204b for input / output and secondary coil connection of the electromagnetic conversion element 202 and the through-hole terminals 209a, 209b, 209c, and 209 for input / output are provided.
It is connected between d.

As shown in FIG. 1, a circuit board 201 is provided, and secondary coil connecting L-type pin terminals 301a and 301b are provided.
Through-hole terminals 204a, 204 for connecting a secondary coil
Inserted in b and soldered, L-type pin terminal for input / output 302
In order to insert and solder a, 302b, 302c, 302d into the input / output through-hole terminals 209a, 209b, 209c, 209d, the terminal insertion, soldering and cutting conventionally required for individual circuit boards have been performed. It is possible to omit the steps such as the above, and it is possible to greatly reduce the working cost.

Further, in the circuit board of the magnetic balance type current detector shown in FIG. 8, in order to connect the lead terminal of the SIP type magnetoelectric conversion element 701 to the board, the lead terminal is passed through the board hole and manually soldered. Whereas the need arises, in the circuit board of the magnetic balance type current detector shown in FIG. 6, since the SMT type magnetoelectric conversion element 202 is arranged on the circuit board, automatic mounting becomes possible, and the work is performed. Since man-hours can be reduced,
An inexpensive current detector can be provided.

[0025]

As described above, according to the present invention, it is possible to provide a magnetic balance type current detector with an improved assembly process and a low processing cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a magnetic balance type current detector according to an embodiment of the present invention. 1A is a front view and FIG. 1B is a side view.

FIG. 2 is an explanatory diagram of a bobbin of the magnetic balance type current detector according to the embodiment of the present invention. 2 (a) is a front view, FIG.
(B) is a side view.

FIG. 3 is an explanatory view showing a state body in which a bobbin of the magnetic balance type current detector according to the embodiment of the present invention is wound. Figure 3
3A is a front view, and FIG. 3B is a side view.

FIG. 4 is an assembly diagram of a core, a coil, and a bobbin of the magnetic balance type current detector according to the embodiment of the present invention. 4A is a front view and FIG. 4B is a side view.

FIG. 5 is an explanatory diagram of a core of the magnetic balance type current detector according to the embodiment of the present invention. FIG. 5A is a plan view of one core piece, FIG. 5B is a plan view of the other core piece, and FIG.
Is a plan view in which the core piece of FIG. 5 (a) and the core piece of FIG. 5 (b) are combined.

FIG. 6 is an explanatory diagram of a circuit board for a magnetic balance type current detector according to an embodiment of the present invention. FIG. 6A is a plan view and FIG.
(B) is a side view.

FIG. 7 is a diagram showing a conventional magnetic balance type current detector. Figure 7
7A is a front view, FIG. 7B is a side view, FIG. 7C is a top view, and FIG. 7D is a perspective view of a bent core.

FIG. 8 is an explanatory diagram of a circuit board of a conventional magnetic balance type current detector. 8A is a front view, FIG. 8B is a plan view, and FIG.
(C) is a side view.

[Explanation of symbols]

101 bobbin 102a, 102b core piece 103 circuit board 104a, 104b, 104c, 104d input / output terminal 105 primary coil 105 'primary coil terminal 106 secondary coil 107 insulating tape 201 circuit board 202 magnetoelectric conversion element 203a, 203b core piece 204a , 204b Through-hole terminal 205 for connecting secondary coil 205 Bobbin 206 Secondary coil 207 Insulating tape 208 Primary coil 208 'Primary coil terminal 209a, 209b, 209c, 209d Through-hole terminal 301a, 301b for input / output (formed on bobbin) L-type pin terminals 302a, 302b, 302c, 302d for secondary coil connection (formed) L-type pin terminals 502, 503 for input / output (formed on the bobbin) Eyelets 601a, 601b Bending core 701 SIP type Hall element 801, 802 Care gap

Claims (4)

[Claims] 1. A core made of a ferromagnetic material forming a closed magnetic circuit including a magnetic gap, a bobbin around which a secondary coil is wound, and a primary coil wound over the secondary coil.
In a current detector including a magnetic sensitive element arranged in the magnetic gap and a circuit board, a pair of end portions of conductive wires forming the secondary coil body are connected to the bobbin. A terminal and a plurality of terminals for electrically and mechanically connecting to the circuit board are provided, and a core made of a ferromagnetic material that forms a closed magnetic path including the magnetic gap is abutted in a pair. A core piece formed by forming a closed magnetic circuit including a magnetic gap, and by connecting and fixing the terminals of the bobbin and the magnetic sensitive element to mounting positions provided on the circuit board,
The circuit board and the magneto-sensitive element are fixed to the bobbin, and the secondary coil wound around the bobbin is electrically connected to the bobbin by wiring provided on the circuit board. A current detector, wherein the current detector is configured so that the plurality of connected terminals serve as input / output terminals. 2. The current detector according to claim 1, wherein central axes of the primary coil and the secondary coil wound around the bobbin are arranged parallel to a vertical direction of the circuit board. A current detector characterized in that 3. The current detector according to claim 1 or 2, wherein the end portions of the core piece adjacent to each other are each processed into a flat plate shape, and a through hole is provided in the end portion. A current detector characterized in that the through holes are overlapped with each other and the end portions are connected and fixed by a pin structure, a rivet structure or an eyelet structure. 4. The current detector according to claim 1, wherein the primary coil wound from above the secondary coil is made of a three-layer insulated wire, and each of the ends has the A current detector characterized in that it is fixed to the bobbin by press-fitting, heat caulking or bonding.