JPH08233864A - Electric amount measuring apparatus - Google Patents

Abstract

PURPOSE: To easily position a Hall element for converting a magnetic field to a voltage at the magnetic gap of a magnetic core for generating the field according to a current supplied to a coil. CONSTITUTION: A small-sized board 29 fixed with a Hall element 27 is engaged fixedly within the magnetic gap 24 of a magnetic core 23, and the core 23 and the board 29 are fixed on an electric circuit board 25 in this state. The element 27 is disposed at a specified position in the gap 24 in the state that the board 29 is fixed to the core 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic-voltage converter for converting a magnetic field generated in a magnetic core into a voltage between magnetic gaps of a magnetic core for converting a current supplied to a wound coil into a magnetic field. The present invention relates to an electric quantity measuring device in which an element is arranged.

[0002]

2. Description of the Related Art As a conventional electric quantity measuring device, for example, there is one shown in FIG. When a current is passed through the coil 3 wound around the magnetic core 1, a magnetic field is generated in the magnetic core 1, and this magnetic field is converted from magnetic to voltage provided in a magnetic gap 5 having a gap t between the magnetic core 1. It is converted into a voltage by an element, for example, a Hall element 7. The voltage output from the Hall element 7 is processed by a signal processing circuit (not shown) provided on the circuit board 9 shown in FIG. 4B, which is a sectional view taken along the line AA of FIG. The value of the current supplied to No. 3 is calculated.

FIG. 4B shows a structure for fixing the magnetic core 1 and the Hall element 7 to the circuit board 9. In this fixing structure, the Hall element 7 is soldered onto the circuit board 9 via the terminal 7a, and the magnetic core 5 is formed by the mold resin 10 with the magnetic gap 5 of the magnetic core 1 aligned with the Hall element 7. 1 and the Hall element 7 are fixed on the circuit board 9.

FIG. 5 shows another example of a fixing structure, in which a board 17 having a hall element 15 mounted thereon is fixed on a support member 13 provided on a circuit board 11, and a magnetic core 19 is attached to the hall element 15. In a state where the magnetic gap is aligned, the magnetic core 19 is fixed to the circuit board 11 via the bobbin 21 around which the coil 20 is wound, and the mold resin 22 is provided between the magnetic gaps. It will be fixed in between.

[0005]

By the way, a magnetic-voltage conversion element such as a Hall element needs to be provided at an appropriate position defined with respect to the magnetic gap of the magnetic core, and if it is deviated from the appropriate position, the magnetic element is supplied. The magnetic field proportional to the applied current cannot be sufficiently obtained, the accuracy of the output voltage is deteriorated, and the reliability is lowered.

However, in the conventional fixing structure as described above, the magnetic-voltage converting element is fixed to the circuit board side and arranged at a prescribed position in the magnetic gap in both cases of FIG. 4 and FIG. Since the magnetic core is fixed to the circuit board as described above, highly accurate work is required for positioning the magnetic-voltage conversion element and the magnetic gap, and a large number of steps are required for assembly.

Therefore, an object of the present invention is to facilitate positioning of a magnetic-voltage conversion element for converting a magnetic field into a voltage with respect to a magnetic gap of a magnetic core.

[0008]

To achieve the above object, the present invention secures a magnetic-voltage converting element for converting a magnetic field into a voltage to a positioning member, and supplies the positioning member to a wound coil. The magnetic-voltage conversion element is positioned and fixed to a magnetic core having a magnetic gap for converting the generated electric current into a magnetic field so that the magnetic-voltage conversion element is arranged at a specified position in the magnetic gap.

[0009]

According to the electric quantity measuring device having such a configuration, the positioning member to which the magnetic-voltage converting element is fixed in advance is positioned and fixed to the magnetic core, so that the magnetic-voltage converting element is located within the magnetic gap. It will be placed in the prescribed position.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an essential part of an electric quantity measuring device showing an embodiment of the present invention. The ring-shaped magnetic core 23 is similar to that shown in FIGS. 4 and 5, in which a coil (not shown) is wound and a magnetic gap 24 having a gap t is formed, and an electric circuit board which is a main circuit board. It is fixed on 25.

In the magnetic gap 24, a small board 29 as a sub-circuit board on which a Hall element 27 which is a magnetic-voltage conversion element is mounted is fitted in the magnetic core 23 at a vertical center position in the drawing. There is. The small substrate 29 positions the Hall element 27 at a specified position within the magnetic gap 24, and as shown in FIG. 2A, notches 29a are formed on both sides in the center in the longitudinal direction. 24 has a fitting portion 29b fitted therein, and the hall element 27 is mounted and fixed at the center of the fitting portion 29b.

The width dimension between the cutout portions 29a in the fitting portion 29b is approximately the same as the gap t of the magnetic gap 24, whereby the small substrate 29 can be fitted and fixed to the magnetic core 23. With the small substrate 29 fixed to the magnetic core 23, the Hall element 27 has the magnetic gap 24.
The Hall element 27 is mounted and fixed on the small board 29 so that the Hall element 27 can be accurately positioned at a predetermined position. A mold resin 31 is provided around the joint between the small substrate 29 and the magnetic core 23.

One end of a lead terminal 33 to which the Hall element 27 is electrically connected is connected to both ends of the small board 29 that protrude from the magnetic gap 24 to the outside, and the lead terminal 3 is connected.
The other end of 3 is connected to a wiring pattern 35 on an electric circuit board 25 having a signal processing circuit for processing the output signal of the hall element 27.

According to the above configuration, the small board 2
After fixing the Hall element 27 to 9, the small substrate 29 to which the Hall element 27 is fixed is fixed to the magnetic core 23 so that the fitting portion 29b is fitted in the magnetic gap 24. In this state, the Hall element 27 is accurately positioned at the specified position within the magnetic gap 24. After that, the mold resin 31 is provided around the connecting portion between the small substrate 29 and the magnetic core 23.

After the small board 29 is positioned and fixed on the magnetic core 23, the magnetic core 23 and the small board 29 are fixed.
The lead terminal 33 of is fixed to the electric circuit board 25. Since the positional relationship between the Hall element 27 and the magnetic gap 24 has already been accurately positioned, this fixing operation does not need to be performed with high accuracy, and a rough positional relationship is sufficient and can be easily performed. The magnetic core 23 may be fixed to the electric circuit board 25 in a state of being in close contact with it, or may be fixed to the electric circuit board 25 at a predetermined distance.

FIG. 2 (b) shows another example of the small board 30, in which notches 30a are formed on both sides at one end.
As a result, the fitting portion 30b that enters the magnetic gap 24 is formed.
Thus, the Hall element 27 is mounted at the center of the fitting portion 30b. The width dimension between the cutout portions 30a in the fitting portion 30b is approximately the same as the gap t of the magnetic gap 24, whereby the small board 30 can be fitted and fixed to the magnetic core 23. Also in this example,
The Hall element 27 is arranged at a prescribed position in the magnetic gap 24 with the small substrate 30 fixed to the magnetic core 23.

In the above embodiment, the small board 29 (3
Although the cutout portion 29a (30a) is formed in 0), a cutout groove is provided on the magnetic core 23 side, and a rectangular small substrate without the cutout portion 29a (30a) is provided in the cutout groove. You may make it fit.

FIG. 3 is an exploded perspective view of a main part of an electric quantity measuring device showing another embodiment of the present invention. A cutout recess 37a to be fitted into an end 39a of the magnetic core 39 in which the magnetic gap 41 is formed is formed on the upper surface of the center of both sides of the small circuit board 37 which is the sub circuit board in this embodiment. The board 37 is formed with a fitting portion 37b which is fitted into the magnetic gap 41. The width dimension between the cutout recesses 37a in the fitting portion 37b is approximately the same as the gap t of the magnetic gap 24, whereby the small board 37 can be fitted and fixed to the magnetic core 23.

A Hall element 43, which is a magnetic-voltage conversion element, is mounted and fixed on the fitting portion 37b of the small board 37 in a state of being erected via a terminal 45. In this fixed state, the small board 37 is mounted. When is fixed to the magnetic core 39, the Hall element 43 is positioned at the specified position of the magnetic gap 41.

Also in this embodiment, by fixing the small substrate 37 to the magnetic core 39, the Hall element 43 is positioned at the prescribed position of the magnetic gap 41.
In this state, as in the embodiment of FIG. 1, the magnetic gap 4
After the molding resin is provided in the inside 1, the magnetic core 39 is fixed to an electric circuit board which is a main circuit board (not shown), and lead terminals 47 drawn out from the small board 37
Is connected to the electric circuit board. Therefore, in FIG.
Also in the embodiment, in the work of fixing the magnetic core 39 and the lead terminal 47 to the electric circuit board, the positional relationship between the Hall element 43 and the magnetic gap 41 is already accurately positioned by the small board 37. It does not need to be performed with high precision, and a rough positional relationship is sufficient and can be easily performed.

In the embodiment shown in FIG. 3 as well, the cutout recess 37a is formed in the small substrate 37. On the contrary, the cutout recess is provided in the end 39a of the magnetic core 39, and this cutout recess is You may make it fit in the flat small board which does not provide the notch recessed part 37a.

Further, in the electric quantity measuring device of each of the above embodiments, an example of measuring the supplied current value is shown, but the present invention can be applied to the case of measuring electric energy.

[0024]

As described above, according to the present invention, the positioning member to which the magnetic-voltage converting element is fixed in advance is positioned and fixed in the magnetic gap of the magnetic core. The transducing element can be easily positioned at a defined position within the magnetic gap.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an electric quantity measuring device according to an embodiment of the present invention.

2A is a perspective view of a small board in the electric quantity measuring device of FIG. 1, and FIG. 2B is a perspective view of a small board showing another example.

FIG. 3 is an exploded perspective view of a main part of an electric quantity measuring device showing another embodiment of the present invention.

FIG. 4A is an explanatory view of a conventional electric quantity measuring device,
(B) is an AA sectional view of (a).

FIG. 5 is an explanatory diagram of another conventional electrical quantity measuring device.

[Explanation of symbols]

23, 39 Magnetic core 24, 41 Magnetic gap 25 Electric circuit board (main circuit board) 27 Hall element (magnetic-voltage conversion element) 29, 30, 37 Small board (sub circuit board, positioning member) 29b, 30b, 37b Fitting part

Claims (3)

[Claims] 1. A magnetic core provided with a magnetic-voltage conversion element for converting a magnetic field into a voltage, which is fixed to a positioning member, and which has a magnetic gap for converting a current supplied to a wound coil into a magnetic field. An electric quantity measuring device is characterized in that the magnetic-voltage converting element is positioned and fixed so as to be arranged at a prescribed position in the magnetic gap. 2. The positioning member is a sub-circuit board on which a magnetic-voltage conversion element is mounted, and the sub-circuit board comprises:
2. A quantity of electricity according to claim 1, further comprising a signal processing circuit for processing an output signal of the magnetic-voltage conversion element, the structure being electrically connected to a main circuit board on which a magnetic core is fixed. measuring device. 3. The electrical quantity measuring device according to claim 2, wherein the sub-circuit board includes a fitting portion that is fitted into the magnetic gap in the magnetic core.