JPH056374U - Current detector - Google Patents

Abstract

(57) [Abstract] [Purpose] A current detector for detecting and controlling direct current and alternating current flowing in a circuit. It has a small board mounting area, is small, and has excellent electrical withstand voltage characteristics. Use as a container. The outer case 1 has a rectangular box case that mainly houses the circuit boards 13a and 13b on which the magnetic sensitive elements 12 and the like are mounted, a through hole 4 that houses the ferromagnetic core 11, and has an aspect ratio. Has a structure in which an annular body case 1b whose length is shorter than that of the box body case is vertically stacked and combined, and the outer diameter of the coil 2 wound through the through hole 4 of the annular body case is smaller than that of the box case. The coil is a current detector covered with an electrically insulating shrink tube.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a device for detecting and controlling a direct current or an alternating current of an electric device or an electronic device. The present invention relates to a current detector used in a device.

[0002]

[Prior art]

  Conventionally, this type of current detector has an annular ferromagnetic material with a magnetic gap as shown in FIG. The coil 54 is wound around the case 55 containing the core 52 to form a coil between the magnetic gaps. Magnetic sensitive element 53 for detecting magnetic flux generated in proportion to flowing current, and detection of magnetic sensitive element Circuit components for amplifying voltage and trimming resistors are mounted on the circuit board, and Is disposed in the magnetic gap, and the ferromagnetic core 52 and the magnetic sensitive element 53 are mounted on the magnetic core. The assembled circuit board is housed in the insulating case 51, and the coil wire end portion 56 and the signal and sensor are attached. The external terminal 58 such as a power source for driving an amplifier circuit for amplifying the output of the magnetic element is an insulating case. The current detector is configured by being locked by the concave engaging portion provided on the.

[0003]

[Problems to be solved by the device]

  However, in such a conventional current detector, the size of the current detector becomes larger. The mounting area of the board on which the current detector is mounted is large, and the coil Between the magnetic sensor, the magnetic sensitive element, the mounting board on which the amplifier circuit is mounted, and the adjacent electronic components. Since it is difficult to obtain the edge distance, the board mounting density is small and the overall size can be reduced. There were problems such as piles.

[0004]

[Means for Solving the Problems]

  In order to solve the above problems, the current detector of the present invention is mainly made up of an outer case that is magnetically sensitive. Contains a rectangular box case that houses the circuit board on which elements and other elements are mounted, and a ferromagnetic core. An annular body case having a through hole to be housed and having a vertical and horizontal length shorter than the box case. It is configured by stacking and stacking the above and below. It has a winding. At this time, the outer diameter of the wound winding is a rectangular box case. The configuration is set so that it does not overflow.

[0005]   That is, the present invention is as follows. A ferromagnetic core provided with a magnetic gap crossing the magnetic path; Circuit that mounts the magnetic sensitive element in the air gap and mounts the circuit component that amplifies the detection signal of the magnetic sensitive element. A circuit board, an outer case for accommodating the ferromagnetic core and the circuit board, and the ferromagnetic material In a current detector formed by winding a coil with the magnetic path of the core inside, The case is a substantially rectangular box case containing a board on which the magnetic sensing element and circuit parts are mounted. And a through-hole for winding the coil with the ferromagnetic core housed in the upper part of the box case. Arrange the provided ring-shaped case, and the ring-shaped case is vertically and horizontally longer than the box-shaped case. Is a short ring-shaped cylinder, and the coil is wound around one leg of the ring-shaped cylinder through the through hole. The outer diameter of the wound coil should be less than the outer dimension of the box case. Is a current detector. 2. A board on which a magnetic sensing element is mounted, circuit parts, and A circuit board is constructed by combining boards with trimming resistors arranged in a T shape, and The circuit board that is connected to the input and output terminals of the signal The current detector according to claim 1, wherein the current detector is arranged below the body core. 3. The coil wound around the annular case is covered with an electrically insulating shrink tube. It is the current detector according to claim 1 and claim 2 to be characterized.

[0006]

[Action]

  By using the current detector of the present invention, it is possible to attach it to the coil portion through which the detected current flows. The insulation distance from the board can be made large enough and it can be installed on top of the current detector. Insulation distance that can sufficiently guarantee the withstand voltage characteristics even if a board on which other circuits are mounted is installed. You can keep the distance. In addition, a substrate with a magnetic sensing element installed, trimming resistors and other A substrate with a built-in path component is separated into two parts, combined in a T shape, and made ferromagnetic. By using a wound core made of a silicon steel plate with high saturation magnetic flux for the body core, It can be an inexpensive current detector.

[0007]

【Example】

An embodiment of the present invention will be described with reference to the drawings. 1 is an external perspective view of an embodiment of a current detector according to the present invention, and FIG. 2 (a) is a plan view of a partially fragmented top view of the current detector according to the present invention shown in FIG. 2 (b) is a partially fragmented side view of the current detector according to the present invention shown in FIG. As shown in FIG. 1, the outer case 1 is configured by vertically combining a box case 1a having a substantially rectangular shape and an annular case 1b having a through hole 4 which is shorter in length and width than the box case 1a and has a coil 2 in the annular case. It is wound around one leg of the annular body case 1b through the through hole 4 of 1b. The current input / output terminal 2a at the end of the coil 2 and the input / output terminal 3 for the DC power supply and the detection signal supplied to the magnetic sensing element are formed so as to project on the bottom surface of the box case 1a.

[0008]   FIG. 2 (a) is a partially fragmented plan view of the annular case portion of the current detector according to the present invention. 2 (b) is a partially fragmented longitudinal sectional view showing the configuration of the current detector according to the present invention. Is. A magnetic air gap 11b is formed in a part of the magnetic path of the rectangular annular ferromagnetic core 11, A magnetic sensing element 12 such as a Hall element is arranged in the center of the magnetic gap 11b. Magnetic sensitive element Circuit board that has an amplifier circuit attached to it to amplify the detection signal of the magnetic sensitive element. The plate is a circuit board 13a on which the magnetic sensing element 12 is mounted, a circuit component, a trimming resistor, The circuit board 13b on which the input / output terminals 3 are formed is combined and formed in a T shape. Circuit board A ring having a rectangular box case 1a and a through hole 4 in which a ferromagnetic core is housed. The case bodies 1b are combined vertically. At this time, the ring-shaped body case 1b has a circuit board both vertically and horizontally. It is set shorter than the rectangular box case 1a on which the plate is mounted, and the side of the annular case 1b. Do not let the coil 2 wound around the leg of the surface protrude outside the rectangular box case 1a. To The current input / output terminal 2a of the coil end and the input / output terminal connected to the circuit board The child 3 is formed by being drawn outward from the bottom surface of the box body case 1a. Also the substrate When mounted, ensure the electrical breakdown voltage between the coil 2 and the board on which the adjacent electronic components are mounted. For this reason, the entire annular case 1b around which the coil 2 is wound is made of a resin shrink Cover with the tube 17.

[0009]

[Effect of device]

  The current detector according to the present invention comprises a coil part and a part for amplifying the output signal of the magnetic sensitive element. Even if the circuit board is installed between the mounting boards of the product or above the current detector, It is possible to maintain an insulation distance that guarantees sufficient withstand voltage. In addition, the winding in the lateral direction There is no popping out, and there is sufficient electrical insulation from adjacent electronic components, and the mounting board is tightly packed. It is effective in increasing the degree of movement, and the ferromagnetic core and the magnetic sensitive element are mounted on the mounting board in the vertical direction. Since it is mounted on the board, it is possible to use a miniaturized current detector with a small board mounting area. You can

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a current detector according to the present invention.

2A and 2B are a plan view and a side view of the current detector shown in FIG. 1. FIG. 2A is a partially crushed plan view and FIG. 2B is a partially crushed side view.

FIG. 3 is a partially crushed side view showing a configuration of a conventional current detector.

[Explanation of reference numerals] 1 outer case 1a box case 1b annular body case 2,54 coil 2a current input / output terminal 3 input / output terminal 4 through hole 11,52 ferromagnetic core 11b magnetic gap 12,53 magnetic sensitive element 13a, 13b Circuit board 17 Shrink tube 51 Insulation case 55 Case 56 Coil wire end 58 External terminal 59 Reinforcement pin

Claims (3)

[Scope of utility model registration request] 1. A ferromagnetic core provided with a magnetic air gap crossing a magnetic path, a circuit board on which a magnetic sensitive element is arranged in the magnetic air gap, and a circuit component for amplifying a detection signal of the magnetic sensitive element is mounted, In an outer case housing a ferromagnetic core and a circuit board, and in a current detector formed by winding a coil with the magnetic path of the ferromagnetic core inside, the outer case mounts the magnetic sensing element and circuit components. A substantially rectangular box case containing the substrate, and an annular case having a through hole around which the ferromagnetic core is housed and a coil is wound are arranged on the upper part of the box case. An annular tubular body having a length shorter in the vertical and horizontal directions than the body case, a coil is wound around one leg of the annular tubular body through a through hole, and the outer diameter of the wound coil is equal to or less than the outer dimension of the box body case. A current detector characterized in that 2. A circuit board is formed by combining a board on which a magnetic sensing element is mounted and a board on which circuit components and trimming resistors are arranged, and which is connected to a current input / output terminal and a signal input / output terminal. The current detector according to claim 1, wherein the circuit board is arranged below a ferromagnetic core around which a coil is wound. 3. The current detector according to claim 1, wherein the coil wound around the annular case is covered with an electrically insulating shrink tube.