WO2021111951A1

WO2021111951A1 - Shunt resistance module

Info

Publication number: WO2021111951A1
Application number: PCT/JP2020/043866
Authority: WO
Inventors: 保遠藤
Original assignee: Koa株式会社
Priority date: 2019-12-06
Filing date: 2020-11-25
Publication date: 2021-06-10
Also published as: JP2021089250A

Abstract

The purpose of the present invention is to provide a shunt resistance module which allows easy drawing out of a voltage signal pattern, and which can provide stable connection with an electrode. A shunt resistance module (1) according to the present invention is characterized by comprising: a shunt resistor (2) including a first electrode (5) and a second electrode (6) facing each other in the height direction, and a columnar resistor (4) connected between the electrodes; and a wiring substrate (3) including a plurality of voltage signal patterns (8a, 8b) which are electrically connected to the respective electrodes and detect a voltage between the electrodes. The shunt resistance module is also characterized in that the second electrode includes an extension part (6a) which extends in the planar direction beyond the first electrode, and the wiring substrate is mounted on the surface of the extension part.

Description

Shunt resistor module

The present invention relates to a shunt resistor module provided with a shunt resistor.

For example, a shunt resistor is used to detect the current of a power semiconductor device or the like.

As a shunt resistor, for example, a structure in which a plurality of columnar resistors are arranged between a pair of electrodes spaced apart from each other in the height direction is known (see the invention described in Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2017-212297

However, in a shunt resistor having a three-dimensional structure as shown in Patent Document 1, it is necessary to draw out voltage detection terminals from electrodes having different heights. At this time, there has been a demand for a structure in which the voltage detection terminal can be easily and stably pulled out.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a shunt resistor module capable of easily drawing out a voltage signal pattern and obtaining connection stability with an electrode.

The shunt resistor module of one aspect of the present invention includes a shunt resistor including a first electrode and a second electrode facing each other in the height direction, and a columnar resistor connected between the electrodes. Each electrode has a wiring substrate that is electrically connected to each other and has a plurality of voltage signal patterns for detecting a voltage between the electrodes, and the second electrode is the first electrode. The wiring board is provided with an extension portion extending in a plane direction, and the wiring substrate is placed on the surface of the extension portion.

According to the shunt resistance module of the present invention, a wiring board on which a voltage signal pattern is formed is used, and the wiring board is arranged on an extension portion provided on an electrode. As a result, the voltage signal pattern can be easily drawn out, and the connection stability with the electrodes can be obtained.

It is a perspective view of the shunt resistance module which concerns on 1st Embodiment. It is an exploded perspective view of the shunt resistance module of FIG. FIG. 3A is a plan view of the wiring board used for the shunt resistor module of the present embodiment, and FIG. 3B is a back view of the wiring board. It is sectional drawing of the shunt resistance module of FIG. It is sectional drawing of the shunt resistance module which concerns on 2nd Embodiment. It is a perspective view of the shunt resistance module which concerns on other embodiment. It is an exploded perspective view of the shunt resistance module of FIG. It is a top view of the shunt resistance module of FIG. It is a side view of the shunt resistance module of FIG. 10A and 10B are partially enlarged cross-sectional views showing a part of the shunt resistor module of FIG.

Hereinafter, the shunt resistance module according to the present embodiment will be described with reference to the attached drawings.

As a result of intensive research, the present inventor can easily change the voltage signal pattern in a shunt resistor module having a shunt resistor having a three-dimensional structure in which electrodes (terminals) are arranged above and below the columnar resistor in the height direction. The present invention has been developed in order to draw out and obtain connection stability with an electrode.

That is, the shunt resistance module of the first embodiment is
(1) A shunt resistor including a first electrode and a second electrode facing each other in the height direction, and a columnar resistor connected between the electrodes.
(2) Each electrode has a wiring board that is electrically connected to each other and has a plurality of voltage signal patterns for detecting a voltage between the electrodes.
(3) The second electrode is provided with an extending portion extending in a plane direction from the first electrode, and the wiring board is placed on the surface of the extending portion.
Hereinafter, the structure of the shunt resistor module 1 of the first embodiment will be described.

<Shunt resistor module 1 of the first embodiment>
FIG. 1 is a perspective view of the shunt resistance module according to the first embodiment. FIG. 2 is an exploded perspective view of the shunt resistance module according to the first embodiment. FIG. 3A is a plan view of the wiring board used for the shunt resistor module of the present embodiment, and FIG. 3B is a back view of the wiring board. FIG. 4 is a cross-sectional view of the shunt resistor module according to the first embodiment.

As shown in FIGS. 1, 2 and 4, the shunt resistor module 1 includes a shunt resistor 2 and a wiring board 3 provided with a plurality of

voltage signal patterns

8a and 8b.

(Shunt resistor 2)
As shown in FIGS. 2 and 4, it has a columnar resistor 4 extending in the height direction (Z), and a first electrode 5 and a second electrode 6 arranged at both upper and lower ends of the resistor 4. It is composed of. The first electrode 5 and the second electrode 6 have lower electrical resistance values than the resistor 4. Although the material is not limited, for example, the resistor 4 is a metal such as Cu—Ni, Cu—Mn, or Ni—Cr, and the

electrodes

5 and 6 are metals such as Cu.

As shown in FIG. 2, for example, a plurality of columnar resistors 4 are arranged side by side. A common first electrode 5 is provided on the upper surface of each resistor 4, and a common second electrode 6 is provided on the lower surface of each resistor 4.

As shown in FIGS. 2 and 4, the second electrode 6 extends longer in the X direction than the first electrode 5. In the present specification, a portion extending longer than the first electrode 5 is referred to as an extending portion 6a. The X direction is a plane direction orthogonal to the height direction (Z).

As shown in FIGS. 2 and 4, a through hole 5a is formed in the first electrode 5. The through hole 5a penetrates from the front surface to the back surface of the first electrode 5 and is provided at a position deviated from the position facing the resistor 4 in the height direction (Z).

As shown in FIGS. 2 and 4,

fixing holes

5b and 6b are formed in the centers of the first electrode 5 and the second electrode 6. The

fixing holes

5b and 6b are formed in a straight line along the height direction (Z).

(Wiring board 3)
The wiring board 3 includes an insulating substrate 7, a first voltage signal pattern 8a formed on the surface 7a of the insulating substrate 7, a second voltage signal pattern 8b, and a connector 9.

As shown in FIGS. 3A and 4, a first voltage signal pattern 8a and a second voltage signal pattern 8b are formed on the surface 7a of the insulating substrate 7. A first connection pad 8c having a predetermined area is integrally formed at one end of the first voltage signal pattern 8a. Further, the other end of the first voltage signal pattern 8a is electrically connected to the connector 9.

As shown in FIG. 3B, a second connection pad 8d having a predetermined size and a fixing pattern 8e are formed on the back surface 7b of the insulating substrate 7. The second connection pad 8d and the fixed pattern 8e are not electrically connected. The second connection pad 8d and the fixing pattern 8e are connected on the extending portion 6a by soldering, a conductive adhesive, or the like.

As shown in FIG. 4, an internal conductive layer 41 is formed inside the insulating substrate 7, and the internal conductive layer 41 leads to the second connection pad 8d. 3A and 3B show the positions of the internal conductive layer 41 with reference numerals.

As shown in FIG. 3A, the internal conductive layer 41 is electrically connected to the second voltage signal pattern 8b drawn out from the surface 7a of the insulating substrate 7. The second voltage signal pattern 8b is electrically connected to the connector 9 at an end opposite to the side connected to the internal conductive layer 41. As shown in FIG. 3A, a power supply pattern 8f is formed on the surface 7a of the insulating substrate 7 in addition to the

voltage signal patterns

8a and 8b.

In the first embodiment, as shown in FIGS. 1 and 4, the wiring board 3 is placed on the extending portion 6a of the second electrode 6, and at this time, the wiring board 3 is soldered or the like. The second connection pad 8d and the fixing pattern 8e of the above are fixedly supported on the second electrode 6. As a result, the second electrode 6 and the second voltage signal pattern 8b are electrically connected via the second connection pad 8d and the internal conductive layer 41.

As shown in FIGS. 2 and 4, a rod-shaped conductive member 42 is inserted into the through hole 5a provided in the first electrode 5. The material of the conductive member 42 does not matter, but for example, iron, copper, brass, or the like. The conductive member 42 is formed longer in the height direction (Z) than the plate thickness of the second electrode 5, and as shown in FIG. 4, the conductive member 42 is inserted through the through hole 5a of the first electrode 5. 42 comes into contact with the first connection pad 8c of the wiring board 3. At this time, it is preferable that the conductive member 42 and the first connection pad 8c are fixedly supported by soldering, a conductive adhesive, or the like. As a result, the first electrode 5 and the first voltage signal pattern 8a are electrically connected via the conductive member 42 and the first connection pad 8c.

(Mounting structure of shunt resistor module 1)
As shown in FIG. 2, for example, bus bars 44 and 45 as external wiring members are superposed on the front surface side and the back surface side of the shunt resistor 2. At this time, the fixing

holes

44a and 45a formed in the bus bars 44 and 45 are aligned with the positions of the fixing

holes

5b and 6b formed in the first electrode 5 and the second electrode 6.

Then, the fixing member 46 is inserted into the fixing

holes

44a and 45a of the bus bars 44 and 45 and the fixing

holes

5b and 6b of the

electrodes

5 and 6 via an insulating washer or the like. As shown in FIGS. 2 and 4, the tip of the fixing member 46 is a threaded portion 46a, and similarly, the bus bar 45 is also threaded. Therefore, the fixing member 46 can be inserted into the fixing

holes

5b, 6b, 44a, 45a and screwed to the bus bar 45, whereby the bus bars 44, 45 can be fixedly supported by the shunt resistance module 1. ..

As shown in FIGS. 2 and 4, for example, an insulating tube 47 is attached to the peripheral surface of the fixing member 46, except for the screw portion 46a at the tip. For example, by inserting the insulating tube 47 into the fixing member 46 and contracting it, it can be fixed around the fixing member 46. As shown in FIG. 4, the insulating tube 47 insulates between the

electrodes

5 and 6 of the shunt resistor 2 in a state where the fixing member 46 is inserted into the fixing

holes

5b, 6b, 44a and 45a. Therefore, when a current flows between the bus bars 44 and 45 via the shunt resistor module 1, it is possible to prevent a problem that the current flows through the fixing member 46. In addition to the configuration using the insulating tube 47, for example, an insulating material may be coated, sprayed, or vapor-deposited on the surface of the fixing member 46 to form an insulating layer.

The shunt resistor module 1 in the present embodiment is connected to a voltmeter (not shown) via a connector 9 and measures a voltage value between the first electrode 5 and the second electrode 6. At this time, since the resistance value of the resistor 4 constituting the shunt resistor 2 is known, the current value can be detected according to Ohm's law. As described above, the shunt resistance module 1 in the present embodiment can be used as a current detection device.

(About the effect of this embodiment)
In the first embodiment, the shunt resistor 2 and the wiring board 3 on which the

voltage signal patterns

8a and 8b are formed are used, and the wiring board 3 is placed on the extension portion 6a provided on the second electrode 6. It was placed in.

By consolidating the

voltage signal patterns

8a and 8b on the wiring board 3 and placing the wiring board 3 on the extending portion 6a in this way, the wiring board 3 can be stably supported and each of them can be supported. The

voltage signal patterns

8a and 8b can be easily drawn out from between the

electrodes

5 and 6, and the connection stability with the

electrodes

5 and 6 can be ensured.

At this time, between the first electrode 5 and the wiring board 3, the conductive member 42 is passed through the through hole 5a provided in the first electrode 5, and the conductive member 42 is brought into contact with the first connection pad 8c. As a result, the first electrode 5 and the first voltage signal pattern 8a can be easily and electrically connected, and better connection stability can be ensured.

A second voltage signal pattern 8b is formed on the front surface of the wiring board 3 together with the first voltage signal pattern 8a, and a second voltage signal pattern 8b is connected to the back surface of the wiring board 3. The connection pad 8d of 2 is provided. In the first embodiment, the wiring board 3 is placed on the extending portion 6a of the second electrode 6, so that the second connection pad 8d and the second electrode 6 can be electrically connected to each other. As a result, the second electrode 6 and the second voltage signal pattern 8b can be easily and electrically connected, and more excellent connection stability can be ensured.

Further, as described above, the first voltage signal pattern 8a electrically connected to the first electrode 5 and the second voltage signal pattern 8b electrically connected to the second electrode 6 are used. It was arranged on the surface 7a of the insulating substrate 7. That is, the first voltage signal pattern 8a and the second voltage signal pattern 8b are drawn out from the same surface.

Here, when a current flows through the resistor 4 between the

electrodes

5 and 6, a magnetic flux (magnetic field) is generated according to the right-handed screw rule. However, in the first embodiment described above, each voltage signal pattern 8a, As a result of pulling out 8b from the same surface, the influence of magnetic flux can be suppressed, and current detection can be performed with high accuracy. That is, by pulling out the first voltage signal pattern 8a and the second voltage signal pattern 8b from the same height position, magnetic flux wraparound is less likely to occur and the influence of magnetic flux is suppressed as compared with pulling out at different heights. This makes it possible to perform current detection with high accuracy.

<Shunt resistance module 10 of the second embodiment>
FIG. 5 is a cross-sectional view of the shunt resistor module according to the second embodiment. In FIG. 5, the same members as those in the first embodiment described above are designated by the same reference numerals.

As shown in FIG. 5, the shunt resistor module 10 has a plurality of columnar resistors 4 located between the first electrode 5, the second electrode 6, and the first electrode 5 and the second electrode 6. A shunt resistor 2 having the above and a wiring board 13 are provided.

The wiring board 13 has an insulating substrate 7, a first voltage signal pattern 8a formed on the front surface 7a of the insulating substrate 7, and a second voltage signal pattern 8b formed on the back surface 7b of the insulating substrate 7. The ends of the

voltage signal patterns

8a and 8b form the

connection pads

8c and 8d shown in FIGS. 3A and 3B.

As shown in FIG. 5, a conductive spring (elastic member) 51 is provided between the first connection pad 8c connected to the first voltage signal pattern 8a and the first electrode 5. Further, a conductive spring (elastic member) 52 is provided between the second connection pad 8d connected to the second voltage signal pattern 8b and the second electrode 6. As a result, the

connection pads

8c and 8d and the

electrodes

5 and 6 are electrically connected.

As shown in FIG. 5, an electrically insulating pedestal 54 is provided on the extending portion 6a of the second electrode 6, and the wiring board 13 is arranged on the pedestal 54. By placing the wiring board 13 on the pedestal 54, a stable support structure can be obtained. The material of the pedestal 54 does not matter, but it is made of resin, for example.

The

springs

51 and 52 are fixedly supported on the

connection pads

8c and 8d of the wiring board 13 or the

electrodes

5 and 6 in advance by soldering or the like, and the wiring board 13 is supported by the first electrodes 5 and the second. Insert into the space between the electrodes 16. At this time, due to the elastic force of the

springs

51 and 52, the

connection pads

8c and 8d can be easily electrically connected to each of the

electrodes

5 and 6, and the connection stability can be ensured.

<Shunt resistor module 20 of another embodiment>
FIG. 6 is a perspective view of the shunt resistor module according to another embodiment. FIG. 7 is an exploded perspective view of the shunt resistor module of FIG. FIG. 8 is a plan view of the shunt resistor module of FIG. FIG. 9 is a side view of the shunt resistor module of FIG. 10A and 10B are partially enlarged cross-sectional views showing a part of the shunt resistor module of FIG.

In the shunt resistor module 20 shown in another embodiment shown in FIG. 6 and the like, the

electrodes

25 and 26 constituting the shunt resistor 22 are enlarged as the current increases, and the resistance interposed between the

electrodes

25 and 26 is increased. This is an example of a case where the length of the body 24 in the height direction is shortened.

That is, in another embodiment, the space height between the first electrode 25 and the second electrode 26 is smaller than that in the first embodiment and the second embodiment described above. , It becomes difficult to insert the

wiring boards

3 and 13 shown in the first embodiment and the second embodiment into the narrow space between the first electrode 25 and the second electrode 26.

Therefore, in another embodiment, for example, the first electrode 25 and the second electrode 26 having the same shape are arranged so as to be offset in the plane direction, whereby the voltage signal pattern is formed on the surface of the protruding portion 26a. It was decided to provide 28 and a connector 29. That is, the second electrode 26 also serves as a wiring board (connector board).

As an example, as shown in FIG. 10A, an insulating layer 31, a voltage signal pattern 28, etc. are formed on the surface of the extending portion 26a by using a thin film technique such as plating or sputtering. As shown in FIG. 10A, a connection pad (corresponding to the second connection pad 8d of the first embodiment) 33 is formed on the extension portion 26a, and is located on the surface of the insulating layer 31 (not shown). Electrically connect to the voltage signal pattern of 2. The voltage signal pattern 28 illustrated in FIG. 10A is a first voltage signal pattern, and the first voltage signal pattern 28 and the first electrode 25 are electrically connected via, for example, bumps 34 formed by plating or the like. Can be connected.

Alternatively, as shown in FIG. 10B, the first voltage signal pattern 28 and the first electrode 25 can be directly and electrically connected in consideration of the film thickness of the insulating layer 31 and the like.

According to the shunt resistor module 20 of another embodiment shown in FIGS. 5 to 10, the voltage signal pattern can be easily drawn out according to the reduction in height of the shunt resistor 22, and the connection with the electrode is stable. Sex can be ensured.

Although the present embodiment and the modified example have been described, as another embodiment, the above-described embodiment and the modified example may be combined in whole or in part.

Further, the present embodiment is not limited to the above-described embodiment and modification, and may be variously modified, replaced, or modified without departing from the spirit of the technical idea. Further, if the technical idea can be realized in another way by the advancement of the technology or another technology derived from it, it may be carried out by using that method. Therefore, the claims cover all embodiments that may be included within the scope of the technical idea.
The feature points in the above-described embodiment are summarized below.

The shunt resistor module according to the present embodiment includes a shunt resistor including a first electrode and a second electrode facing each other in the height direction, and a columnar resistor connected between the electrodes. Each of the electrodes is electrically connected to a wiring substrate having a plurality of voltage signal patterns for detecting a voltage between the electrodes, and the second electrode has a wiring substrate from the first electrode. Also provided with an extension portion extending in the plane direction, the wiring substrate is mounted on the surface of the extension portion.

Further, in the present embodiment, the first electrode is provided with a through hole, a conductive member is inserted into the through hole, and the conductive member is electrically connected to the first electrode. It is preferable that the voltage signal pattern is in contact with the surface of the voltage signal pattern.

Further, in the present embodiment, the plurality of voltage signal patterns are formed on the front surface of the wiring board, the connection pad is formed on the back surface of the wiring board, and the connection pad is the second. It is preferably connected to the voltage signal pattern that is electrically connected to the electrode.

Further, the shunt resistor module according to another embodiment includes a shunt resistor including a pair of electrodes facing each other in the height direction and a columnar resistor connected between the electrodes, and a shunt resistor for each electrode. A wiring board that is electrically connected and has a plurality of voltage signal patterns for detecting a voltage between each electrode, and one electrode is a wiring board (connector board) on which a voltage signal pattern is formed. ) Is also used.

As described above, the shunt resistor module of the present invention can use a shunt resistor having a three-dimensional structure, can be miniaturized, can handle a large current, and can easily draw out a voltage signal pattern. Moreover, the connection stability with the electrode can be obtained. The shunt resistor module of the present invention can be applied to, for example, current detection and battery energy management for control applications such as power semiconductor devices.

This application is based on Japanese Patent Application No. 2019-220953 filed on December 6, 2019. All this content is included here.

Claims

A shunt resistor comprising a first electrode and a second electrode facing each other in the height direction and a columnar resistor connected between the electrodes.
Each electrode has a wiring board that is electrically connected and has a plurality of voltage signal patterns for detecting the voltage between the electrodes.
The second electrode is provided with an extension portion extending in a plane direction with respect to the first electrode, and the wiring board is placed on the surface of the extension portion. module.
The first electrode is provided with a through hole, a conductive member is inserted into the through hole, and the conductive member is electrically connected to the first electrode. The shunt resistor module according to claim 1, wherein the shunt resistance module is in contact with the surface of the pattern.
The plurality of voltage signal patterns are formed on the front surface of the wiring board, a connection pad is formed on the back surface of the wiring board, and the connection pad is electrically connected to the second electrode. The shunt resistance module according to claim 2, wherein the shunt resistance module is connected to the voltage signal pattern.