JPH064679U - Current detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the sensitivity of current detection by reducing the gap in which the hall element of the magnetic core of the current detector is arranged to increase the magnetic flux applied to the hall element. Let's make the core,
The current detector is downsized by reducing the occupied volume including the printed board. [Structure] The magnetic core 11 is closely fixed to one side surface of the printed board 13, and the hall element 14 is positioned at the center point of the gap 12 with its magnetically sensitive surface parallel to the side surface 12a of the gap 12. It is a composition.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates generally to current detectors, and more particularly to current detectors for servo equipment in the aircraft field.

[0002]

[Prior art]

The function of the detector for detecting the feeder failure of the current detector used in the aircraft will be described as an example. Referring to FIG. 4, in the AC power supply system, the feeder from the generator G to the busbar will be described. A GCU (Generator Control Unit) generally takes charge of the function of detecting a failure, and the failure is mainly considered to be a disconnection and a ground fault, and the ground fault may be a failure related to the survival of the power generation system. Assuming that the feeder is grounded due to insulation failure or ground accident at the feeder point A on the side where the feeder failure is detected in FIG. 4, a fault current If flows and a current that flows in the current transformer CT _1. The current I ₀ flows more than the current I ₁ flowing through the current transformer CT ₂ by the ratio If / current transformation, and generates an electromotive force across the resistor R. The bias current due to this electromotive force will be described later through the center holes 1b and 1b of the cores 1 and 1 (see FIGS. 5 and 3) of the current detectors integrally incorporated in the current transformers CT ₁ and CT ₂ , respectively. As described above, a signal is sent to the GCU through the hall element 4 and the printed board 3, power generation is stopped and the line contactor LC is opened to protect the power supply system.

FIG. 3 shows a side view of a main part of a conventional current detector. A printed board is placed in a gap 2 formed by penetrating from the inside to the outside in a radial direction of a ring-shaped magnetic core 1. The hole element 4 mounted on the No. 3 is arranged so as to be located substantially at the center of the gap 2, and the magnetic sensitive surfaces 4a on both sides in the figure of the hole element 4 and the inside of the upper and lower sides in the figure of the gap 2 are shown. The side surface 2a is substantially parallel to the side surface 2a and is substantially orthogonal to the side surface 1a at the gap 2 between the printed board 3 and the magnetic core 1. When a current flows through a conductor such as a coil or a wire in the center hole 1b of the magnetic core 1, a magnetic flux is generated in the ring-shaped core 1 and a magnetic force is generated in the hole element 4 arranged in the gap 2. Is applied, the semiconductor hall element 4 made of silicon, cerium, or the like converts magnetism into electricity to generate a voltage, which is detected by a device (not shown) via the printed board 3. The current flowing through the center hole 1b of the magnetic core 1 is detected.

[0004]

[Problems to be solved by the device]

 Since the hole element 4 and the printed board 3 are inserted into the gap 2 of the magnetic core 1 having the above structure, the distance between the both side surfaces 2a of the gap 2 becomes unavoidably large, and the hole element 4 The magnetic flux passing through the magnetic sensitive surface 4a is relatively small, and the printed board 3 and the magnetic core 1 are orthogonal to each other, so that the current detector occupies a relatively large volume. .

[0005]

[Means for Solving the Problems]

 According to the present invention, one of the two side surfaces of a plane shape, which are perpendicular to the axis of the ring-shaped magnetic core and parallel to each other, are fixed to the printed board by making one of them parallel to the printed board. The above problem was solved by making the body core parallel to the side surface of the gap and positioned at the center point of the gap. Also, by providing a hole on the printed circuit board at a position corresponding to the center hole of the magnetic core, the hole being concentric with the center hole and having the same diameter, the current detector of the present invention can be mounted on related equipment or other elements can be installed. Made it easy to place in the center hole.

[0006]

[Action]

 As in the case of FIG. 3 described above, a magnetic flux is generated in the magnetic core by the current passing through the center hole of the ring-shaped magnetic core, and the magnetism is applied to the hole element arranged in the gap of the core. Since the hall element converts magnetism into electricity to generate a voltage and is detected by a device (not shown) through the printed board, the current passing through the central hole of the magnetic core is detected.

[0007]

【Example】

 FIG. 1 is a plan view showing a main part of an embodiment of a current detector according to the present invention, and a side view thereof is shown in FIG. 2. The ring-shaped magnetic core 11 is one of the planar shapes (see FIG. 2). The lower side surface 11a is closely fixed to the surface of the printed board 13, the hall element 14 is arranged at the center position of the gap 12 in the radial direction of the core 11, and the magnetic sensing surface of the hall element 14 is disposed. Reference numeral 14a is parallel to both inner side surfaces 12a of the gap 12, and a plurality of wirings 15 extending vertically from the printed board 13 vertically support the hall element 14. In addition, a circular hole 13a having the same diameter is formed in the printed board 13 at a position corresponding to the central hole 11b of the core 11. The circular hole 13a is not essential, but when the current detector of the present invention is mounted, the circular hole 13a of the printed board 13 is not only from the upper side where the printed board 13 of the magnetic core 11 is not mounted. It becomes possible to introduce another element or lead wire from the bottom side by using. The action of detecting the current passing through the central hole 11b of the core 11 is exactly the same as in the case of FIG.

[0008]

[Effect of device]

 The printed board is placed in close contact with one of the side surfaces (lower side in FIG. 2) of the magnetic core so that the hole 13a having the same diameter is positioned corresponding to the central hole 11b of the magnetic core. Since the printed circuit board is not inserted in the board, the gap width can be reduced, and the magnetic flux applied to the hall element is increased, so the current detection sensitivity is increased, while the magnetic material on the printed circuit board is increased. Since the cores are installed in parallel, the volume occupied by the current detector can be reduced, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of an embodiment of a current detector according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a side view of a main part of a conventional current detector.

FIG. 4 is a diagram illustrating detection of a feeder failure in a conventional power supply system.

5 is a diagram illustrating the relationship between the bias current and the core of the current detector according to FIG.

[Explanation of symbols]

 11 Magnetic Material Core 11a Core Side Surface 11b Central Hole of Magnetic Material Core 12 Gap 12a Gap Side Surface 13 Printed Board 13a Hole Opened in Printed Board 14 Hall Element 14a Magnetic Sensitive Surface

Claims (2)

[Scope of utility model registration request] 1. A ring part defining a predetermined center hole, a magnetic core separated by a gap through which a part of the ring part penetrates in a radial direction, and a hole element arranged in the gap. A current detector comprising a printed board to which the hall element is connected: one of the planar side surfaces of the magnetic core is fixed to the printed board, and the other planar side surface of the magnetic core is the printed board. The current detector is characterized in that the hole element is arranged at the center position of the gap such that its magnetic sensitive surface is parallel to both side surfaces defining the gap. 2. The current detector according to claim 1, wherein the printed board has a hole coaxial with the magnetic core center hole and having the same diameter.