JPH0629744Y2 - Current-voltage converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a current-voltage converter that monitors a current flowing through an electric device or the like and outputs a voltage signal according to a change in the current.

<< Prior Art >> Such a current-voltage converter has a structure in which a coil 4 is wound around a ring-shaped core 3 which is formed in a ring shape so that both ends 1 and 2 closely face each other as shown in FIG. The path 5 is formed, and the Hall element 7 is arranged in the gap 6 between the ends 1 and 2 so as to intersect the magnetic flux passing through the magnetic path 5 at a substantially right angle.

Then, when the coil 4 is connected to the circuit of the apparatus main body (not shown) and the connection cable of the electric device to be measured is passed through the annular core 3, the magnetic flux passing through the annular core 3 according to the current flowing through the electric device is generated. Since this changes, the change in magnetic flux is detected by the Hall element 7, the current value flowing through the electric device is converted into a voltage value, and the voltage value is output as a signal.

<< Problems to be Solved by the Invention >> Such a current-voltage converter is conventionally made by housing a coil unit formed by one energizing coil, an annular core, a Hall element 7, etc. in each case. It was

For this reason, when a plurality of current-voltage converters are required, a large installation space is required, and the cost is increased.

The present invention has been made in view of the above points, and an object thereof is to provide a current-voltage converter in which a plurality of coil units are housed in the same case to achieve compactness.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention has a structure in which a coil is wound around an annular core formed entirely in an annular shape so that both ends closely oppose each other, and both ends of the annular core are A current-voltage conversion device in which a Hall element is arranged between the parts so as to intersect the magnetic flux passing through the annular core at a substantially right angle, and a plurality of cylinder parts provided adjacent to a case body of the device and the cylinder part. While accommodating the annular core in the space formed by the surrounding wall surrounding the outside, the Hall elements held by the element holders are inserted and arranged between both ends of the annular core, and the Hall element is detected. The surfaces are arranged so as to be substantially parallel to the magnetic flux directions of the other adjacent annular cores, and the Hall element has a bottom wall and a side wall of the element holder formed in a substantially U-shaped cross section and the annular shape. With the end faces at both ends of the core It is characterized in that the element holder is disposed in the positioning recess formed in step 1, and the element holder is attached so as to straddle both ends of the annular core.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway exploded perspective view showing a main part configuration of a current-voltage converter according to an embodiment of the present invention, and FIG. 2 is a plan view showing the main part of the same device as shown in FIG. FIG. 3 is a partially enlarged plan view of a coil unit of the same device.

In these figures, the case body 10 made of synthetic resin is
The upper surface is formed in a box shape, and the lower surface is integrally formed with tubular portions 11 and 12, and surrounding walls 13 and 14 that surround the outer sides of the tubular portions 11 and 12 and are lower than them. . In the space portions 15 and 16 formed by the tubular portions 11 and 12 and the surrounding walls 13 and 14, a plurality of thin sheet iron pieces formed into an annular shape so that both end portions 17 and 18 closely face each other are laminated. An annular core 19, a coil 20 wound around the annular core 19, and both ends 17, 1 of the annular core 19.
8 is an annular coil unit 2 including an element holder 21 disposed between 8 and a Hall element 30 held by the element holder 21 and disposed between both ends 17 and 18 of the annular core 19.
2 are stored respectively.

Then, the semi-cylindrical auxiliary core 40 made of a thin iron plate is provided so as to closely face both ends 17 and 18 of the annular core 19.
Are attached to the outer peripheries of the tubular portions 11 and 12 with both end portions 40a thereof locked to the vertical grooves 11a and 12a of the tubular portions 11 and 12, respectively.

The element holder 21 is, as shown in FIGS. 3 and 4,
The cross-section is formed in a substantially U-shape, and is attached to both ends 17 and 18 of the annular core 19 so as to straddle the bottom wall 23 and the bottom wall 23 which has received the lower surface in the vicinity of the ends 17 and 18, respectively. It has side walls 24 and 25 which rise at substantially right angles and receive the side surfaces of both ends 17 and 18. Side wall 2
Positioning protrusions 26, which protrude inward, are formed on the inner surfaces of
27 is formed. The step 28 formed by the protrusions 26 and 27 holds the space between the both ends 17 and 18. Then, the bottom wall 23 and the side wall 2 of this element holder 21
Positioning recesses 29 are formed by the end surfaces of both end portions 17 and 18 of the annular core 19 and 4, 25, and the hall element 30 is disposed in the recess 29.

As shown in FIGS. 5 and 6, the Hall element 30 has four electrode terminals 32 extending from the side surface of the element body 31, and lead wires 33 are connected to the electrode terminals 32, respectively. In addition, the width dimension of the element body 31 of the Hall element 30 is slightly smaller than the dimension between the protrusions 26 of the element holder 21, and the thickness dimension is the end portions 1 of the annular core 19.
It is slightly smaller than the dimension between 7 and 18. Further, the height dimension is formed to be substantially equal to the thickness of the annular core 19. Therefore, the Hall element 30 is always held in a fixed position so that it is just accommodated in the recess 29, and the magnetic flux enters the detection surface at a right angle and passes through.

The annular core 19 in which the Hall element 30 is positioned in the recess 29 and the coil 20 is wound is further covered with an insulating tape, and the coil lead wire connected to the coil 20 from between the tapes. Only the lead wire 33 connected to the electrode terminals 32 of the Hall element 30 is led out. And these lead wires 33, 35, 3
6 is connected to a circuit board 39 having openings 37 and 38 for escaping the cylindrical portions 11 and 12, and the circuit board 39 is put on and attached to the case body 10, and a cover is further put thereon.

In each of the coil units 22 thus configured, when a current is applied to the coil 20, a magnetic field is generated and the magnetic flux along the magnetic path 34 crosses the Hall element 30 at a right angle. This magnetic flux is weakened because a gap is formed between the end portions 17 and 18 of the annular core 19 in the related art, but in this structure, the end portions 17 and 18 are closely opposed to each other to assist the magnetic flux. Since the core 40 is provided, the Hall element 30 is hardly weakened.
Passes through the inside and the detection sensitivity is improved. Since the Hall element 30 is positioned and held by the element holder 21, the detection position does not shift and the detection accuracy is improved.

Further, in the coil unit 22 arranged in each of the space portions 15 and 16 in the case main body 10, as shown in FIG. 2, each Hall element 30 is connected to the line X connecting the centers of both space portions 15 and 16. On the other hand, they are arranged so as to be inclined inward by about 45 degrees. This is a coil unit 2 placed adjacent to
This is to prevent the magnetic fluxes of the two persons from being detected by the Hall element 30 on the other side. That is, each coil unit 2
When a magnetic field is generated in 2, the magnetic flux spreads outward concentrically and leaks. Therefore, the detection surface of the Hall element 30 in the adjacent coil unit 22 is perpendicular to the adjacent magnetic flux spreading in a concentric circle. When this occurs, the leaking magnetic flux is detected by the Hall element 30 and the detection accuracy deteriorates. In consideration of this, when the Hall elements 30 are arranged in a form inclining toward each other with an angle of about 45 degrees with respect to the line X connecting the centers of the two space portions 15 and 16, the adjacent Hall elements 30 are The magnetic flux leaking concentrically from the coil unit 22 becomes parallel to the detection surface of the Hall element 30. In addition, the hall element 30 is housed in the space formed by the tubular portion 11 and the surrounding wall. Therefore, the plurality of coil units 2
Even if the two are arranged in one case body 10 with a small gap, it is possible to prevent a decrease in the detection accuracy of each Hall element 30, and a plurality of coil units 22 are arranged with a small gap in one case body 10. Being able to arrange the device makes it possible to make the entire device more compact. The arrangement angle of the Hall element 30 may be arbitrarily set as long as the detection surface of the Hall element 30 is substantially parallel to the adjacent leakage magnetic flux and is not greatly affected by the leakage magnetic flux.

<< Advantages of Device >> As described above, according to the present invention, the detection surface of each Hall element of each coil unit disposed adjacent to each other is made substantially parallel to the direction of the magnetic flux of another coil unit disposed adjacent thereto. Since the coil unit is arranged, the coil unit does not receive the leakage magnetic flux of the other coil unit adjacently arranged, and the plurality of coil units can be arranged in one case body with a small gap, and the entire apparatus can be compactly assembled. It will be possible.

Further, since the Hall element held by the element holder is arranged between both ends of the annular core, the magnetic flux can be effectively detected,
In addition, the Hall element is reliably positioned and held by the element holder, and the detection position does not shift.

Furthermore, as a result of the element holder being housed in the space formed by the tubular portion and the surrounding wall, it is possible to adopt a configuration in which the magnetic flux does not leak to the outside as much as possible in the surrounding wall, and the other adjacent elements are arranged. The influence of magnetic flux leakage on the coil unit is minimized. From this point as well, a plurality of coil units can be arranged in one case body with a small gap,
It can be said that the entire device can be compactly integrated.

Further, the element holder is formed in a substantially U-shaped cross section, and the bottom wall and the side wall of the element holder are arranged in the positioning recess formed by the end faces of the both ends of the annular core. By using the end surface of the annular core to attach the Hall element, the number of parts can be reduced, the structure can be made as compact as possible, and the positioning of the Hall element can be ensured. You can

[Brief description of drawings]

FIG. 1 is a partially cutaway exploded perspective view showing a main part configuration of a current-voltage converter according to an embodiment of the present invention, and FIG. 2 is a plan view showing the main part of the same device as shown in FIG. Is a partially enlarged plan view of the coil unit of the same device, and FIG. 4 is A of FIG.
5 is a vertical sectional view taken along line A, FIG. 5 is a front view showing an example of the Hall element used in the same apparatus shown in FIGS. 1 to 4, and FIG. 6 is the Hall element shown in FIG. Side view of the seventh
The figure is a plan view showing an example of a coil unit in a conventional current-voltage converter. 10 ... Case body, 19 ... Annular core, 20 ... Coil, 21 ... Element holder, 23 ... Bottom wall, 24, 25 ...
... Side wall, 29 ... Hall element positioning recess, 30 ... Hall element, 40 ... auxiliary core.

Claims (1)

[Scope of utility model registration request] 1. A coil is wound around an annular core formed entirely in an annular shape so that both ends closely oppose each other, and a hole is formed between both ends of the annular core so as to intersect the magnetic flux passing through the annular core at a substantially right angle. A current-voltage converter in which elements are arranged,
The annular core is housed in a space formed by a plurality of cylindrical portions provided adjacent to the case body of the device and a surrounding wall surrounding the outside of the cylindrical portion, and between the both ends of the annular core. The Hall element held in each element holder is inserted and arranged, the detection surface of the Hall element is arranged so as to be substantially parallel to the direction of the magnetic flux of the other annular core adjacently arranged, and the Hall element is , The element holder is formed in a positioning recess formed by the bottom wall and the side wall of the element holder having a substantially U-shaped cross section and the end faces at both ends of the annular core, and the element holder is provided at both ends of the annular core. A current-voltage converter characterized in that it is mounted over.