WO2023112438A1 - Shunt resistor and current detection device - Google Patents

Shunt resistor and current detection device Download PDF

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Publication number
WO2023112438A1
WO2023112438A1 PCT/JP2022/037221 JP2022037221W WO2023112438A1 WO 2023112438 A1 WO2023112438 A1 WO 2023112438A1 JP 2022037221 W JP2022037221 W JP 2022037221W WO 2023112438 A1 WO2023112438 A1 WO 2023112438A1
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Prior art keywords
voltage
shunt resistor
detection section
resistor
voltage detection
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PCT/JP2022/037221
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French (fr)
Japanese (ja)
Inventor
正樹 北川
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Koa株式会社
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Publication of WO2023112438A1 publication Critical patent/WO2023112438A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/144—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being welded or soldered
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C13/00—Resistors not provided for elsewhere
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids

Definitions

  • the present invention relates to shunt resistors and current detection devices.
  • Shunt resistors are widely used for current sensing applications.
  • Such a shunt resistor comprises a resistor and electrodes joined across the resistor.
  • resistors are made of resistance alloys such as copper-nickel alloys, copper-manganese alloys, iron-chromium alloys, and nickel-chromium alloys
  • electrodes are made of highly conductive metals such as copper. It is configured.
  • a voltage detection section is provided on the electrode, and the voltage generated at both ends of the resistor is detected by connecting a conducting wire (for example, an aluminum wire) to the voltage detection section.
  • the temperature coefficient of resistance (TCR) characteristics are important in order to enable current detection under conditions where the influence of temperature fluctuations is small.
  • the temperature coefficient of resistance is an index that indicates the rate of change in resistance value due to temperature, and the smaller the absolute value, the smaller the change in resistance value.
  • an object of the present invention is to provide a shunt resistor and a current detection device capable of reducing the absolute value of the temperature coefficient of resistance.
  • a shunt resistor used for current sensing comprises a resistor and a pair of electrodes connected across the resistor in a first direction.
  • the shunt resistor has a first protrusion formed on a first side surface of the shunt resistor parallel to the first direction, and the shunt resistor a surface opposite to the first side surface.
  • a second protrusion formed on a second side surface of the second protrusion, the first protrusion having a portion of the resistor and a portion of the pair of electrodes;
  • the projecting portion has a portion of the resistor and a portion of the pair of electrodes.
  • the first protrusion includes a first voltage detection section and a second voltage detection section connected to both ends of the resistor in the first direction
  • the second protrusion includes the It has a third voltage detection section and a fourth voltage detection section connected to both ends of the resistor in the first direction
  • the first voltage detection section and the third voltage detection section are arranged on the same electrode.
  • the second voltage detection section and the fourth voltage detection section are arranged on the same electrode.
  • the first protrusion has a first corner and a second corner connected to the pair of electrodes
  • the second protrusion has a second corner connected to the pair of electrodes.
  • the shunt resistor has a first recess formed in the first side surface and a second recess formed in the second side surface, and the first protrusion is formed in the It is arranged in the first recess, and the second protrusion is arranged in the second recess.
  • a current detection device in one aspect, includes the shunt resistor and a current detection circuit board having a voltage signal wiring that transmits a voltage signal from the shunt resistor.
  • the voltage signal wiring is electrically connected to the first voltage detection section and the second voltage detection section of the first protrusion, and the third voltage detection section and the fourth voltage detection section of the second protrusion. ing.
  • the current detection circuit board further includes a voltage terminal pad, and the voltage terminal pad comprises the first voltage detection section, the second voltage detection section, the third voltage detection section, It is connected to the fourth voltage detection section and the voltage signal wiring.
  • the current detection device includes a voltage calculator connected to the shunt resistor, the voltage calculator measuring between the first voltage detector and the second voltage detector. and the voltage value measured between the third voltage detection unit and the fourth voltage detection unit are averaged, and the averaged voltage value is a detected voltage value. to decide.
  • the current detection device includes a voltage calculator connected to the shunt resistor, the voltage calculator measuring between the first voltage detector and the fourth voltage detector. or the voltage value measured between the second voltage detector and the third voltage detector is determined as the detected voltage value.
  • the current detection device includes a voltage calculator connected to the shunt resistor, the voltage calculator measuring between the first voltage detector and the fourth voltage detector. and the voltage value measured between the second voltage detection unit and the third voltage detection unit are averaged, and the averaged voltage value is a detected voltage value. to decide.
  • the shunt resistor has a first protrusion and a second protrusion.
  • a shunt resistor having such a structure can reduce the absolute value of its temperature coefficient of resistance.
  • FIG. 11 illustrates one embodiment of a shunt resistor; It is a figure which shows the shunt resistor to which the wiring member was connected. It is an enlarged view of a 1st protrusion part. It is an enlarged view of a 2nd protrusion part.
  • FIG. 5A is a diagram showing corners formed on the first protrusion.
  • FIG. 5B is a diagram showing a corner formed on the second protrusion.
  • FIG. 6A is a diagram showing another embodiment of the corner.
  • FIG. 6B is a diagram showing another embodiment of the corner.
  • FIG. 3 illustrates a current sensing device with a shunt resistor according to one embodiment.
  • FIG. 8A is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side.
  • FIG. 8B is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side.
  • FIG. 8C is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side.
  • FIG. 8D is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side.
  • FIG. 9A is a diagram showing a wiring member connected to a shunt resistor according to one embodiment
  • 9B is a diagram illustrating wiring members connected to a shunt resistor according to one embodiment
  • FIG. 9C is a diagram showing wiring members connected to a shunt resistor according to one embodiment
  • FIG. 9D is a diagram illustrating a wiring member connected to a shunt resistor according to one embodiment
  • FIG. 5 is a graph showing the rate of change in resistance value with temperature change of a conventional shunt resistor having a protrusion on only one side as a comparative example
  • FIG. 5 is a graph showing the rate of change in resistance value of the shunt resistor according to the embodiment with temperature change.
  • FIG. 11 illustrates another embodiment of a shunt resistor;
  • FIG. 1 is a diagram showing one embodiment of a shunt resistor.
  • the shunt resistor 1 includes a resistor 5 made of a resistor alloy plate material having a predetermined thickness and a predetermined width, and both ends of the resistor 5 in the first direction (that is, both side connection surfaces).
  • a pair of electrodes 6,7 composed of a highly conductive metal connected to 5a,5b.
  • the electrode 6 has a contact surface 6a that contacts one end (one connection surface) 5a of the resistor 5, and the electrode 7 has a contact surface that contacts the other end (other connection surface) 5b of the resistor 5. 7a.
  • Bolt holes 8 and 9 for fixing the shunt resistor 1 with screws or the like are formed in the electrodes 6 and 7, respectively.
  • FIG. 2 is a diagram showing a shunt resistor to which wiring members are connected.
  • the electrodes 6 are connected to wiring members (busbars) 40 and the electrodes 7 are connected to wiring members (busbars) 41 .
  • Each of the wiring members 40 and 41 is made of a conductive metal.
  • a bolt hole 48 communicating with the bolt hole 8 is formed in the wiring member 40
  • a bolt hole 49 communicating with the bolt hole 9 is formed in the wiring member 41 .
  • the first direction is the length direction of the resistor 5 and corresponds to the length direction of the shunt resistor 1.
  • the length direction of the shunt resistor 1 is the direction in which the electrode 6, the resistor 5, and the electrode 7 are arranged in this order.
  • the direction perpendicular to this first direction is the second direction.
  • the second direction is the width direction of the shunt resistor 1 .
  • electrodes 6 and 7 have the same structure and are arranged symmetrically with respect to resistor 5 .
  • Both ends 5a and 5b of the resistor 5 are connected (joined) to electrodes 6 and 7 by means of welding (for example, electron beam welding, laser beam welding, brazing, or soldering).
  • An example of the material of the resistor 5 is a low-resistance alloy material such as a Cu--Mn alloy.
  • An example of the material of the electrodes 6 and 7 is copper (Cu).
  • the resistor 5 has a higher resistivity than the electrodes 6,7.
  • the shunt resistor 1 has a first protrusion 11 formed on its first side S1 and a second protrusion 11 formed on a second side S2 opposite to the first side S1. and a projecting portion 12 .
  • the first side surface S1 and the second side surface S2 are surfaces parallel to the first direction.
  • the first protrusion 11 extends outward from the first side surface S1
  • the second protrusion 12 extends outward from the second side surface S2.
  • the first protrusion 11 and the second protrusion 12 are arranged symmetrically with respect to the center of the shunt resistor 1 .
  • FIG. 3 is an enlarged view of the first protrusion.
  • the first projecting portion 11 has a portion of the resistor 5 and a portion of the electrodes 6 and 7 .
  • the first projecting portion 11 has voltage detecting portions 21 and 22 for measuring voltages generated across the resistor 5 at both ends 5a and 5b.
  • the voltage detection unit 21 is connected to the connection surface 5b of the resistor 5, and the voltage detection unit 22 is connected to the connection surface 5a of the resistor 5.
  • Voltage detector 21 is part of electrode 7 and voltage detector 22 is part of electrode 6 .
  • the electrode 7 has the voltage detection section 21 and the electrode 6 has the voltage detection section 22 .
  • FIG. 4 is an enlarged view of the second protrusion.
  • the second protrusion 12 has the same shape as the first protrusion 11 .
  • the second projecting portion 12 has a portion of the resistor 5 and a portion of the electrodes 6 and 7 .
  • the second projecting portion 12 has voltage detecting portions 23 and 24 for measuring voltages generated across the resistor 5 at both ends 5 a and 5 b.
  • the voltage detection section 23 is connected to the connection surface 5b of the resistor 5, and the voltage detection section 24 is connected to the connection surface 5a of the resistor 5.
  • Voltage detector 23 is part of electrode 7 and voltage detector 24 is part of electrode 6 .
  • the electrode 7 has the voltage detection section 23 and the electrode 6 has the voltage detection section 24 .
  • the voltage detection section 21 and the voltage detection section 23 are arranged on the same electrode 7 , and the voltage detection section 22 and the voltage detection section 24 are arranged on the same electrode 6 .
  • Voltage detection unit 23 is arranged in the same direction as voltage detection unit 21 in the second direction, and voltage detection unit 24 is arranged in the same direction as voltage detection unit 22 in the second direction.
  • FIG. 5A is a diagram showing corners formed on the first protrusion
  • FIG. 5B is a diagram showing corners formed on the second protrusion.
  • the first projecting portion 11 has a corner portion 53 connected to the electrode 6 and a corner portion 54 connected to the electrode 7
  • the second projecting portion 12 has a corner portion 55 connected to the electrode 6 and a corner portion 56 connected to the electrode 7 .
  • the corner portion 53 is disposed between the side surface 11a of the first protrusion 11 and the side surface 6c of the electrode 6, and the corner portion 54 is located between the side surface 11b of the first protrusion 11 and the electrode 7. It is arranged between the side surface 7c.
  • the corner portion 55 is disposed between the side surface 12a of the second protrusion 12 and the side surface 6b of the electrode 6, and the corner portion 56 is located between the side surface 12b of the second protrusion 12 and the electrode 7. It is arranged between the side surface 7b.
  • each of the corners 53, 54, 55, 56 has a curved shape.
  • at least one of corners 53, 54, 55, 56 may have a curvilinear shape.
  • the corners 53, 54, 55, 56 may have the same curvature (or radius of curvature) or may have different curvatures (or radius of curvature).
  • the rate of change of the resistance value with temperature rise can be changed to the positive side.
  • the rate of change in resistance value with temperature rise can be changed to the negative side.
  • the temperature coefficient of resistance of the shunt resistor 1 can be adjusted.
  • FIGS. 6A and 6B are diagrams showing other embodiments of corners. As shown in Figures 6A and 6B, at least one of the corners 53, 54, 55, 56 may have an obtuse or rectilinear shape. In the embodiment shown in FIG. 6A, angle ⁇ 1 of corner 53 is greater than 90 degrees and less than 180 degrees (ie obtuse). In the embodiment shown in FIG. 6B, angle ⁇ 2 of corner 53 is 180 degrees (ie, linear shape). With such a configuration, the temperature coefficient of resistance of the shunt resistor 1 can also be adjusted.
  • FIG. 7 is a diagram showing a current detection device with a shunt resistor according to one embodiment.
  • the current detection device 30 includes a shunt resistor 1 and a voltage output device 31 that outputs the voltage of the resistor 5 to the outside.
  • a voltage output device 31 is connected to the shunt resistor 1 .
  • the voltage output device 31 has an output connector (output terminal) 35 for outputting a voltage signal (voltage of the resistor 5) from the shunt resistor 1.
  • FIG. 7 is a diagram showing a current detection device with a shunt resistor according to one embodiment.
  • the current detection device 30 includes a shunt resistor 1 and a voltage output device 31 that outputs the voltage of the resistor 5 to the outside.
  • a voltage output device 31 is connected to the shunt resistor 1 .
  • the voltage output device 31 has an output connector (output terminal) 35 for outputting a voltage signal (voltage of the resistor 5) from the shunt resistor 1.
  • the voltage output device 31 further includes a current detection circuit board 34.
  • the current detection circuit board 34 has voltage signal wirings 46A, 46B, 46C, and 46D for transmitting the voltage signal (voltage of the resistor 5) from the shunt resistor 1 to the output connector 35, and ground wirings 50 and 51. are doing.
  • the voltage signal wirings 46A, 46B, 46C, and 46D are wired on the voltage detection circuit board 34 so as to be line symmetrical.
  • a current detection circuit board 34 is arranged on the shunt resistor 1 .
  • the current detection circuit board 34 further includes voltage terminal pads (more specifically, copper foil portions) 36A, 36B, 36C, and 36D.
  • One end of the voltage signal wiring 46 A is connected to the voltage terminal pad 36 A, and the other end is connected to the output connector 35 .
  • One end of the voltage signal wiring 46 B is connected to the voltage terminal pad 36 B, and the other end is connected to the output connector 35 .
  • One end of the voltage signal wiring 46C is connected to the voltage terminal pad 36C, and the other end is connected to the output connector 35.
  • One end of the voltage signal wiring 46D is connected to the voltage terminal pad 36D, and the other end is connected to the output connector 35.
  • One end of the ground wiring 50 is connected to the voltage terminal pad 36D (or voltage terminal pad 36C), and the other end is connected to the output connector 35 .
  • One end of the ground wiring 51 is connected to the voltage terminal pad 36C (or the voltage terminal pad 36D).
  • the voltage terminal pad 36A is electrically connected to the voltage detection position 16A of the voltage detection portion 21 of the first projecting portion 11 via internal wiring (not shown) of the current detection circuit board 34.
  • the voltage terminal pad 36B is electrically connected to the voltage detection position 16B of the voltage detection portion 23 of the second projecting portion 12 via internal wiring (not shown) of the current detection circuit board 34 .
  • the voltage terminal pad 36 ⁇ /b>C is electrically connected to the voltage detection position 16 ⁇ /b>C of the voltage detection portion 24 of the second projecting portion 12 via internal wiring (not shown) of the current detection circuit board 34 .
  • the voltage terminal pad 36 ⁇ /b>D is electrically connected to the voltage detection position 16 ⁇ /b>D of the voltage detection portion 22 of the first projecting portion 11 via internal wiring (not shown) of the current detection circuit board 34 .
  • the internal wiring and the voltage detection units 21, 22, 23, and 24 are connected by means such as soldering.
  • voltage detection terminals (vertically extending conductive pins) are provided on the voltage detection units 21, 22, 23, and 24 by means of soldering or the like, and the voltage detection terminals are connected to conductive wires (eg, aluminum wires). or a means for inserting the voltage detection terminal into a through hole formed in the circuit board.
  • current detection circuit board 34 may include an operational amplifier (amplifier) for amplifying the voltage signal from shunt resistor 1, an A/D converter, and/or a temperature sensor.
  • the current detection device 30 includes a voltage calculator 65 connected to the shunt resistor 1 via the output connector 35 and the current detection circuit board 34 .
  • the voltage calculation section 65 is a calculation device that determines the detected voltage value of the shunt resistor 1, and an example of the voltage calculation section 65 is a microcomputer or a voltage calculation circuit. In one embodiment, the voltage calculator 65 may be provided on the current detection circuit board 34 .
  • Voltage calculation unit 65 calculates a voltage obtained by combining the voltage value measured between voltage detection unit 21 and voltage detection unit 22 and the voltage value measured between voltage detection unit 23 and voltage detection unit 24. It is configured to average the values and determine the averaged voltage value as the detected voltage value. In this way, the voltage calculator 65 may determine the average value of the voltages measured by the voltage detectors arranged along the first direction of the shunt resistor 1 as the detected voltage value.
  • the voltage calculation unit 65 can output a more stable detected voltage even if the temperature coefficient of resistance is affected by variations in the material, shape, etc. of the shunt resistor 1 .
  • the voltage calculation unit 65 calculates the voltage value measured between the voltage detection unit 21 and the voltage detection unit 24 and the voltage value measured between the voltage detection unit 22 and the voltage detection unit 23. , are averaged, and the averaged voltage value is determined as the detected voltage value. In this way, the voltage calculator 65 may determine the average value of the voltages measured by the voltage detectors arranged on the diagonal line in the second direction of the shunt resistor 1 as the detected voltage value.
  • the voltage calculation unit 65 calculates the voltage value measured between the voltage detection unit 21 and the voltage detection unit 24 or the voltage value measured between the voltage detection unit 22 and the voltage detection unit 23. It is configured to determine the detected voltage value. In this way, the voltage calculation section 65 may determine the voltage value measured by the voltage detection section arranged diagonally in the second direction of the shunt resistor 1 as the detected voltage value.
  • FIGS. 8A to 8D are diagrams showing a wiring member connected to a conventional shunt resistor having a protrusion on only one side as a comparative example.
  • 9A-9D illustrate wiring members connected to a shunt resistor according to one embodiment. Arrows in FIGS. 8A to 8D and arrows in FIGS. 9A to 9D indicate the direction of current flow.
  • 9A, wiring members 40, 41 are connected to electrodes 6, 7 along the first direction of shunt resistor 1. In FIG.
  • the arrangement shown in FIG. 9A may be referred to as a serial arrangement.
  • the wiring members 40 and 41 are connected to the electrodes 6 and 7 along the second direction so as to extend toward the first protrusion 11 side.
  • the arrangement shown in FIG. 9B may be referred to as a U-shaped arrangement.
  • the wiring members 40 and 41 are connected to the electrodes 6 and 7 along the second direction so as to extend toward the second projection 12 side.
  • the arrangement shown in FIG. 9C may be referred to as an inverted U-shaped arrangement.
  • the wiring member 40 is connected to the electrode 6 along the second direction so as to extend toward the first projecting portion 11, and the wiring member 41 extends toward the second projecting portion 12. It is connected to the electrode 7 along the second direction.
  • the arrangement shown in FIG. 9D may be referred to as an S-shaped arrangement.
  • the shunt resistor does not have a protrusion corresponding to the protrusion 12 of the shunt resistor 1 according to this embodiment.
  • the shunt resistors are arranged in series
  • the shunt resistors are arranged in a U shape
  • the shunt resistors are arranged in an inverted U shape.
  • the shunt resistors are arranged in an S-shape.
  • FIG. 10 is a graph showing the rate of change in resistance value with temperature change of a conventional shunt resistor having a protrusion on only one side as a comparative example.
  • FIG. 11 is a graph showing the rate of change in resistance value of the shunt resistor according to this embodiment with temperature change.
  • the horizontal axis indicates the temperature of the shunt resistor
  • the vertical axis indicates the change rate of the resistance value of the shunt resistor.
  • the voltage value obtained by combining the voltage value measured between the voltage detection unit 21 and the voltage detection unit 24 and the voltage value measured between the voltage detection unit 22 and the voltage detection unit 23 is The change rate of the resistance value is shown when the averaged voltage value is used as the detected voltage value.
  • a curve connecting points x indicates the rate of change in the resistance value of the shunt resistor when the wiring members 40 and 41 are arranged in series
  • a curve connecting points ⁇ indicates the rate of change in the resistance value of the wiring members 40 and 41 when the wiring members 40 and 41 are arranged in a U shape.
  • the curve connecting the circles shows the rate of change in the resistance value of the shunt resistor when the wiring members 40 and 41 are arranged in an inverted U shape.
  • the rate of change in the resistance value of the shunt resistor is low.
  • the rate of change of resistance of the shunt resistor is very high.
  • the rate of change in resistance varies depending on the direction in which the wiring members 40 and 41 are connected to the shunt resistor. It may be a design restriction such as restricting the mounting position.
  • the rate of change in the resistance value of the shunt resistor 1 is It is significantly lower than the rate of change of resistance of a shunt resistor with protrusions on only one side.
  • the change rate of the resistance value of the shunt resistor 1 is remarkably low.
  • the change rate of the resistance value of the shunt resistor 1 is remarkably low.
  • the shunt resistor 1 since the shunt resistor 1 has the first projecting portion 11 and the second projecting portion 12, the shunt resistor 1 does not change depending on the arrangement of the wiring members 40 and 41. Resistance can be measured. In other words, the shunt resistor 1 can measure the resistance value without being changed by the current path through itself.
  • the shunt resistor 1 can reduce the change rate of its own resistance value as a whole.
  • stable current detection is possible regardless of the connection direction of the wiring members 40 and 41 to the shunt resistor 1.
  • the mounting position of the shunt resistor 1 Increased design freedom.
  • the change rate of the resistance value of the shunt resistor 1 can be significantly reduced.
  • the shunt resistance even if the contact positions of the wiring members 40 and 41 with the shunt resistor 1 change due to thermal expansion or contraction due to temperature change, and the current path changes, the shunt resistance The influence on the temperature coefficient of resistance of the device 1 can be reduced.
  • FIG. 12 is a diagram showing another embodiment of the shunt resistor.
  • the shunt resistor 1 has a first recess 71 formed on the first side S1 and a second recess 72 formed on the second side S2.
  • the first projection 11 is arranged in the first recess 71 and the second projection 12 is arranged in the second recess 72 .
  • a slit 71b is formed between the first projecting portion 11 and the electrode 6, and a slit 71a is formed between the first projecting portion 11 and the electrode 7.
  • a slit 72 b is formed between the second projecting portion 12 and the electrode 6 and a slit 72 a is formed between the second projecting portion 12 and the electrode 7 .
  • the shunt resistor 1 has the first projecting portion 11 and the second projecting portion 12, so that the same effect as the embodiment described above can be achieved.
  • the present invention can be used for shunt resistors and current detection devices.

Abstract

The present invention relates to a shunt resistor and a current detection device. A shunt resistor (1) comprises a first protrusion (11) and a second protrusion (12). The first protrusion (11) includes a part of a resistive body (5) and a part of a pair of electrodes (6, 7). The second protrusion (12) includes a part of the resistive body (5) and a part of the pair of electrodes (6, 7).

Description

シャント抵抗器および電流検出装置Shunt resistors and current sensing devices
　本発明は、シャント抵抗器および電流検出装置に関する。 The present invention relates to shunt resistors and current detection devices.
　シャント抵抗器は、電流検出用途に広く用いられている。このようなシャント抵抗器は、抵抗体と、抵抗体の両端に接合された電極と、を備えている。一般に、抵抗体は、銅・ニッケル系合金、銅・マンガン系合金、鉄・クロム系合金、ニッケル・クロム系合金等の抵抗合金で構成されており、電極は、銅等の高導電性金属から構成されている。電極には電圧検出部が設けられており、電圧検出部に導線（例えば、アルミワイヤー）を接続することにより抵抗体の両端部で発生した電圧を検出する。 Shunt resistors are widely used for current sensing applications. Such a shunt resistor comprises a resistor and electrodes joined across the resistor. In general, resistors are made of resistance alloys such as copper-nickel alloys, copper-manganese alloys, iron-chromium alloys, and nickel-chromium alloys, and electrodes are made of highly conductive metals such as copper. It is configured. A voltage detection section is provided on the electrode, and the voltage generated at both ends of the resistor is detected by connecting a conducting wire (for example, an aluminum wire) to the voltage detection section.
特開２００７－３２９４２１号公報Japanese Patent Application Laid-Open No. 2007-329421 特表２０１３－５０４２１３号公報Japanese Patent Publication No. 2013-504213 特開２０２０－１０２６２６号公報Japanese Patent Application Laid-Open No. 2020-102626
　シャント抵抗器において、温度変動による影響が小さい条件下での電流の検出を可能にするために、抵抗温度係数（ＴＣＲ）の特性は、重要である。なお、抵抗温度係数は、温度による抵抗値の変化の割合を示す指標であり、その絶対値が小さいほど抵抗値の変化が小さくなる。 In shunt resistors, the temperature coefficient of resistance (TCR) characteristics are important in order to enable current detection under conditions where the influence of temperature fluctuations is small. The temperature coefficient of resistance is an index that indicates the rate of change in resistance value due to temperature, and the smaller the absolute value, the smaller the change in resistance value.
　そこで、本発明は、抵抗温度係数の絶対値を小さくすることができるシャント抵抗器および電流検出装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a shunt resistor and a current detection device capable of reducing the absolute value of the temperature coefficient of resistance.
　一態様では、電流検出に用いられるシャント抵抗器が提供される。シャント抵抗器は、抵抗体と、第１方向における前記抵抗体の両端に接続された一対の電極と、を備える。前記シャント抵抗器は、前記第１方向に平行な面である、前記シャント抵抗器の第１側面に形成された第１突出部と、前記第１側面の反対側の面である前記シャント抵抗器の第２側面に形成された第２突出部と、を有しており、前記第１突出部は、前記抵抗体の一部および前記一対の電極の一部を有しており、前記第２突出部は、前記抵抗体の一部および前記一対の電極の一部を有している。 In one aspect, a shunt resistor used for current sensing is provided. A shunt resistor comprises a resistor and a pair of electrodes connected across the resistor in a first direction. The shunt resistor has a first protrusion formed on a first side surface of the shunt resistor parallel to the first direction, and the shunt resistor a surface opposite to the first side surface. a second protrusion formed on a second side surface of the second protrusion, the first protrusion having a portion of the resistor and a portion of the pair of electrodes; The projecting portion has a portion of the resistor and a portion of the pair of electrodes.
　一態様では、前記第１突出部は、前記第１方向における前記抵抗体の両端に接続された第１電圧検出部および第２電圧検出部を有しており、前記第２突出部は、前記第１方向における前記抵抗体の両端に接続された第３電圧検出部および第４電圧検出部を有しており、前記第１電圧検出部および前記第３電圧検出部は、同一の電極に配置されており、前記第２電圧検出部および前記第４電圧検出部は、同一の電極に配置されている。
　一態様では、前記第１突出部は、前記一対の電極に接続された第１角部および第２角部を有しており、前記第２突出部は、前記一対の電極に接続された第３角部および第４角部を有しており、前記第１角部、前記第２角部、前記第３角部、および前記第４角部の少なくとも１つは、鈍角形状、直線形状または曲線形状を有している。
　一態様では、前記シャント抵抗器は、前記第１側面に形成された第１凹部と、前記第２側面に形成された第２凹部と、を有しており、前記第１突出部は、前記第１凹部に配置されており、前記第２突出部は、前記第２凹部に配置されている。 In one aspect, the first protrusion includes a first voltage detection section and a second voltage detection section connected to both ends of the resistor in the first direction, and the second protrusion includes the It has a third voltage detection section and a fourth voltage detection section connected to both ends of the resistor in the first direction, and the first voltage detection section and the third voltage detection section are arranged on the same electrode. The second voltage detection section and the fourth voltage detection section are arranged on the same electrode.
In one aspect, the first protrusion has a first corner and a second corner connected to the pair of electrodes, and the second protrusion has a second corner connected to the pair of electrodes. It has a triangular portion and a fourth corner portion, and at least one of the first corner portion, the second corner portion, the third corner portion, and the fourth corner portion has an obtuse angle, a linear shape, or a It has a curvilinear shape.
In one aspect, the shunt resistor has a first recess formed in the first side surface and a second recess formed in the second side surface, and the first protrusion is formed in the It is arranged in the first recess, and the second protrusion is arranged in the second recess.
　一態様では、上記シャント抵抗器と、前記シャント抵抗器からの電圧信号を伝達する電圧信号配線を有する電流検出回路基板と、を備える電流検出装置が提供される。前記電圧信号配線は、前記第１突出部の第１電圧検出部および第２電圧検出部と、前記第２突出部の第３電圧検出部および第４電圧検出部と、に電気的に接続されている。 In one aspect, a current detection device is provided that includes the shunt resistor and a current detection circuit board having a voltage signal wiring that transmits a voltage signal from the shunt resistor. The voltage signal wiring is electrically connected to the first voltage detection section and the second voltage detection section of the first protrusion, and the third voltage detection section and the fourth voltage detection section of the second protrusion. ing.
　一態様では、前記電流検出回路基板は、電圧端子用パッドをさらに有しており、前記電圧端子用パッドは、前記第１電圧検出部、前記第２電圧検出部、前記第３電圧検出部、前記第４電圧検出部、および前記電圧信号配線に接続されている。
　一態様では、前記電流検出装置は、前記シャント抵抗器に接続された電圧演算部を備えており、前記電圧演算部は、前記第１電圧検出部と前記第２電圧検出部との間で測定された電圧値と、前記第３電圧検出部と前記第４電圧検出部との間で測定された電圧値と、を組み合わせた電圧値を平均化し、前記平均化された電圧値を検出電圧値に決定する。
　一態様では、前記電流検出装置は、前記シャント抵抗器に接続された電圧演算部を備えており、前記電圧演算部は、前記第１電圧検出部と前記第４電圧検出部との間で測定された電圧値、または前記第２電圧検出部と前記第３電圧検出部との間で測定された電圧値を検出電圧値に決定する。
　一態様では、前記電流検出装置は、前記シャント抵抗器に接続された電圧演算部を備えており、前記電圧演算部は、前記第１電圧検出部と前記第４電圧検出部との間で測定された電圧値と、前記第２電圧検出部と前記第３電圧検出部との間で測定された電圧値と、を組み合わせた電圧値を平均化し、前記平均化された電圧値を検出電圧値に決定する。 In one aspect, the current detection circuit board further includes a voltage terminal pad, and the voltage terminal pad comprises the first voltage detection section, the second voltage detection section, the third voltage detection section, It is connected to the fourth voltage detection section and the voltage signal wiring.
In one aspect, the current detection device includes a voltage calculator connected to the shunt resistor, the voltage calculator measuring between the first voltage detector and the second voltage detector. and the voltage value measured between the third voltage detection unit and the fourth voltage detection unit are averaged, and the averaged voltage value is a detected voltage value. to decide.
In one aspect, the current detection device includes a voltage calculator connected to the shunt resistor, the voltage calculator measuring between the first voltage detector and the fourth voltage detector. or the voltage value measured between the second voltage detector and the third voltage detector is determined as the detected voltage value.
In one aspect, the current detection device includes a voltage calculator connected to the shunt resistor, the voltage calculator measuring between the first voltage detector and the fourth voltage detector. and the voltage value measured between the second voltage detection unit and the third voltage detection unit are averaged, and the averaged voltage value is a detected voltage value. to decide.
　シャント抵抗器は、第１突出部および第２突出部を有している。このような構造を有するシャント抵抗器は、その抵抗温度係数の絶対値を小さくすることができる。 The shunt resistor has a first protrusion and a second protrusion. A shunt resistor having such a structure can reduce the absolute value of its temperature coefficient of resistance.
シャント抵抗器の一実施形態を示す図である。FIG. 11 illustrates one embodiment of a shunt resistor; 配線部材が接続されたシャント抵抗器を示す図である。It is a figure which shows the shunt resistor to which the wiring member was connected. 第１突出部の拡大図である。It is an enlarged view of a 1st protrusion part. 第２突出部の拡大図である。It is an enlarged view of a 2nd protrusion part. 図５Ａは第１突出部に形成された角部を示す図である。FIG. 5A is a diagram showing corners formed on the first protrusion. 図５Ｂは第２突出部に形成された角部を示す図である。FIG. 5B is a diagram showing a corner formed on the second protrusion. 図６Ａは、角部の他の実施形態を示す図である。FIG. 6A is a diagram showing another embodiment of the corner. 図６Ｂは、角部の他の実施形態を示す図である。FIG. 6B is a diagram showing another embodiment of the corner. 一実施形態に係るシャント抵抗器を備えた電流検出装置を示す図である。FIG. 3 illustrates a current sensing device with a shunt resistor according to one embodiment. 図８Ａは、比較例として、片側のみに突出部を備える従来のシャント抵抗器に接続された配線部材を示す図である。FIG. 8A is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side. 図８Ｂは、比較例として、片側のみに突出部を備える従来のシャント抵抗器に接続された配線部材を示す図である。FIG. 8B is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side. 図８Ｃは、比較例として、片側のみに突出部を備える従来のシャント抵抗器に接続された配線部材を示す図である。FIG. 8C is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side. 図８Ｄは、比較例として、片側のみに突出部を備える従来のシャント抵抗器に接続された配線部材を示す図である。FIG. 8D is a diagram showing, as a comparative example, a wiring member connected to a conventional shunt resistor having protrusions on only one side. 図９Ａは、一実施形態に係るシャント抵抗器に接続された配線部材を示す図である。FIG. 9A is a diagram showing a wiring member connected to a shunt resistor according to one embodiment; 図９Ｂは、一実施形態に係るシャント抵抗器に接続された配線部材を示す図である。9B is a diagram illustrating wiring members connected to a shunt resistor according to one embodiment; FIG. 図９Ｃは、一実施形態に係るシャント抵抗器に接続された配線部材を示す図である。FIG. 9C is a diagram showing wiring members connected to a shunt resistor according to one embodiment. 図９Ｄは、一実施形態に係るシャント抵抗器に接続された配線部材を示す図である。FIG. 9D is a diagram illustrating a wiring member connected to a shunt resistor according to one embodiment; 比較例としての片側のみに突出部を備える従来のシャント抵抗器の、温度変化に伴う抵抗値の変化率を示すグラフである。FIG. 5 is a graph showing the rate of change in resistance value with temperature change of a conventional shunt resistor having a protrusion on only one side as a comparative example; FIG. 本実施形態に係るシャント抵抗器の、温度変化に伴う抵抗値の変化率を示すグラフである。5 is a graph showing the rate of change in resistance value of the shunt resistor according to the embodiment with temperature change. シャント抵抗器の他の実施形態を示す図である。FIG. 11 illustrates another embodiment of a shunt resistor;
　以下、本発明の実施形態について図面を参照して説明する。なお、以下で説明する図面において、同一又は相当する構成要素には、同一の符号を付して重複した説明を省略する。以下で説明する複数の実施形態において、特に説明しない一実施形態の構成は、他の実施形態と同じであるので、その重複する説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In the multiple embodiments described below, the configuration of one embodiment that is not particularly described is the same as that of the other embodiments, so redundant description thereof will be omitted.
　図１は、シャント抵抗器の一実施形態を示す図である。図１に示すように、シャント抵抗器１は、所定の厚みおよび所定の幅を有する抵抗合金板材から構成された抵抗体５と、第１方向における抵抗体５の両端（すなわち、両側接続面）５ａ，５ｂに接続された、高導電性金属から構成された一対の電極６，７と、を備えている。 FIG. 1 is a diagram showing one embodiment of a shunt resistor. As shown in FIG. 1, the shunt resistor 1 includes a resistor 5 made of a resistor alloy plate material having a predetermined thickness and a predetermined width, and both ends of the resistor 5 in the first direction (that is, both side connection surfaces). a pair of electrodes 6,7 composed of a highly conductive metal connected to 5a,5b.
　電極６は、抵抗体５の一端（一方の接続面）５ａに接触する接触面６ａを有しており、電極７は、抵抗体５の他端（他方の接続面）５ｂに接触する接触面７ａを有している。電極６，７には、シャント抵抗器１をねじなどで固定するためのボルト穴８，９がそれぞれ形成されている。 The electrode 6 has a contact surface 6a that contacts one end (one connection surface) 5a of the resistor 5, and the electrode 7 has a contact surface that contacts the other end (other connection surface) 5b of the resistor 5. 7a. Bolt holes 8 and 9 for fixing the shunt resistor 1 with screws or the like are formed in the electrodes 6 and 7, respectively.
　図２は、配線部材が接続されたシャント抵抗器を示す図である。図２に示すように、電極６は配線部材（バスバー）４０に接続されており、電極７は配線部材（バスバー）４１に接続されている。配線部材４０，４１のそれぞれは、導電性を有する金属から構成されている。配線部材４０には、ボルト穴８に連通するボルト穴４８が形成されており、配線部材４１には、ボルト穴９に連通するボルト穴４９が形成されている。 FIG. 2 is a diagram showing a shunt resistor to which wiring members are connected. As shown in FIG. 2, the electrodes 6 are connected to wiring members (busbars) 40 and the electrodes 7 are connected to wiring members (busbars) 41 . Each of the wiring members 40 and 41 is made of a conductive metal. A bolt hole 48 communicating with the bolt hole 8 is formed in the wiring member 40 , and a bolt hole 49 communicating with the bolt hole 9 is formed in the wiring member 41 .
　第１方向は、抵抗体５の長さ方向であり、シャント抵抗器１の長さ方向に相当する。シャント抵抗器１の長さ方向は、電極６、抵抗体５、および電極７がこの順に配置される方向である。この第１方向に垂直な方向は、第２方向である。第２方向は、シャント抵抗器１の幅方向である。図１に示すように、電極６，７は、同一の構造を有しており、抵抗体５に関して、対称的に配置されている。 The first direction is the length direction of the resistor 5 and corresponds to the length direction of the shunt resistor 1. The length direction of the shunt resistor 1 is the direction in which the electrode 6, the resistor 5, and the electrode 7 are arranged in this order. The direction perpendicular to this first direction is the second direction. The second direction is the width direction of the shunt resistor 1 . As shown in FIG. 1, electrodes 6 and 7 have the same structure and are arranged symmetrically with respect to resistor 5 .
　抵抗体５の両端５ａ，５ｂのそれぞれは、電極６，７のそれぞれに溶接（例えば、電子ビーム溶接、レーザービーム溶接、または、ろう接、はんだ）などの手段によって接続（接合）されている。抵抗体５の材質の一例として、Ｃｕ－Ｍｎ系合金などの低抵抗合金材を挙げることができる。電極６，７の材質の一例として、銅（Ｃｕ）を挙げることができる。抵抗体５は、電極６，７よりも高い抵抗率を有している。 Both ends 5a and 5b of the resistor 5 are connected (joined) to electrodes 6 and 7 by means of welding (for example, electron beam welding, laser beam welding, brazing, or soldering). An example of the material of the resistor 5 is a low-resistance alloy material such as a Cu--Mn alloy. An example of the material of the electrodes 6 and 7 is copper (Cu). The resistor 5 has a higher resistivity than the electrodes 6,7.
　図１に示すように、シャント抵抗器１は、その第１側面Ｓ１に形成された第１突出部１１と、第１側面Ｓ１の反対側の面である第２側面Ｓ２に形成された第２突出部１２と、を有している。第１側面Ｓ１および第２側面Ｓ２は、第１方向に平行な面である。第１突出部１１は第１側面Ｓ１から外側に延びており、第２突出部１２は第２側面Ｓ２から外側に延びている。第１突出部１１および第２突出部１２は、シャント抵抗器１の中心に関して、対称的に配置されている。 As shown in FIG. 1, the shunt resistor 1 has a first protrusion 11 formed on its first side S1 and a second protrusion 11 formed on a second side S2 opposite to the first side S1. and a projecting portion 12 . The first side surface S1 and the second side surface S2 are surfaces parallel to the first direction. The first protrusion 11 extends outward from the first side surface S1, and the second protrusion 12 extends outward from the second side surface S2. The first protrusion 11 and the second protrusion 12 are arranged symmetrically with respect to the center of the shunt resistor 1 .
　図３は、第１突出部の拡大図である。図３に示すように、第１突出部１１は、抵抗体５の一部および電極６，７の一部を有している。第１突出部１１は、抵抗体５の両端５ａ，５ｂに発生する電圧を測定するための電圧検出部２１，２２を有している。 FIG. 3 is an enlarged view of the first protrusion. As shown in FIG. 3, the first projecting portion 11 has a portion of the resistor 5 and a portion of the electrodes 6 and 7 . The first projecting portion 11 has voltage detecting portions 21 and 22 for measuring voltages generated across the resistor 5 at both ends 5a and 5b.
　電圧検出部２１は抵抗体５の接続面５ｂに接続されており、電圧検出部２２は抵抗体５の接続面５ａに接続されている。電圧検出部２１は電極７の一部であり、電圧検出部２２は電極６の一部である。言い換えれば、電極７は電圧検出部２１を有しており、電極６は電圧検出部２２を有している。 The voltage detection unit 21 is connected to the connection surface 5b of the resistor 5, and the voltage detection unit 22 is connected to the connection surface 5a of the resistor 5. Voltage detector 21 is part of electrode 7 and voltage detector 22 is part of electrode 6 . In other words, the electrode 7 has the voltage detection section 21 and the electrode 6 has the voltage detection section 22 .
　図４は、第２突出部の拡大図である。図４に示すように、第２突出部１２は、第１突出部１１と同一の形状を有している。第２突出部１２は、抵抗体５の一部および電極６，７の一部を有している。第２突出部１２は、抵抗体５の両端５ａ，５ｂに発生する電圧を測定するための電圧検出部２３，２４を有している。 FIG. 4 is an enlarged view of the second protrusion. As shown in FIG. 4 , the second protrusion 12 has the same shape as the first protrusion 11 . The second projecting portion 12 has a portion of the resistor 5 and a portion of the electrodes 6 and 7 . The second projecting portion 12 has voltage detecting portions 23 and 24 for measuring voltages generated across the resistor 5 at both ends 5 a and 5 b.
　電圧検出部２３は抵抗体５の接続面５ｂに接続されており、電圧検出部２４は抵抗体５の接続面５ａに接続されている。電圧検出部２３は電極７の一部であり、電圧検出部２４は電極６の一部である。言い換えれば、電極７は電圧検出部２３を有しており、電極６は電圧検出部２４を有している。 The voltage detection section 23 is connected to the connection surface 5b of the resistor 5, and the voltage detection section 24 is connected to the connection surface 5a of the resistor 5. Voltage detector 23 is part of electrode 7 and voltage detector 24 is part of electrode 6 . In other words, the electrode 7 has the voltage detection section 23 and the electrode 6 has the voltage detection section 24 .
　電圧検出部２１および電圧検出部２３は同一の電極７に配置されており、電圧検出部２２および電圧検出部２４は同一の電極６に配置されている。電圧検出部２３は第２方向において電圧検出部２１と同一方向に配置されており、電圧検出部２４は第２方向において電圧検出部２２と同一方向に配置されている。 The voltage detection section 21 and the voltage detection section 23 are arranged on the same electrode 7 , and the voltage detection section 22 and the voltage detection section 24 are arranged on the same electrode 6 . Voltage detection unit 23 is arranged in the same direction as voltage detection unit 21 in the second direction, and voltage detection unit 24 is arranged in the same direction as voltage detection unit 22 in the second direction.
　図５Ａは第１突出部に形成された角部を示す図であり、図５Ｂは第２突出部に形成された角部を示す図である。図５Ａに示すように、第１突出部１１は、電極６に接続された角部５３と、電極７に接続された角部５４と、を有している。同様に、図５Ｂに示すように、第２突出部１２は、電極６に接続された角部５５と、電極７に接続された角部５６と、を有している。 FIG. 5A is a diagram showing corners formed on the first protrusion, and FIG. 5B is a diagram showing corners formed on the second protrusion. As shown in FIG. 5A, the first projecting portion 11 has a corner portion 53 connected to the electrode 6 and a corner portion 54 connected to the electrode 7 . Similarly, as shown in FIG. 5B, the second projecting portion 12 has a corner portion 55 connected to the electrode 6 and a corner portion 56 connected to the electrode 7 .
　図５Ａに示すように、角部５３は第１突出部１１の側面１１ａと電極６の側面６ｃとの間に配置されており、角部５４は第１突出部１１の側面１１ｂと電極７の側面７ｃとの間に配置されている。図５Ｂに示すように、角部５５は第２突出部１２の側面１２ａと電極６の側面６ｂとの間に配置されており、角部５６は第２突出部１２の側面１２ｂと電極７の側面７ｂとの間に配置されている。 As shown in FIG. 5A, the corner portion 53 is disposed between the side surface 11a of the first protrusion 11 and the side surface 6c of the electrode 6, and the corner portion 54 is located between the side surface 11b of the first protrusion 11 and the electrode 7. It is arranged between the side surface 7c. As shown in FIG. 5B, the corner portion 55 is disposed between the side surface 12a of the second protrusion 12 and the side surface 6b of the electrode 6, and the corner portion 56 is located between the side surface 12b of the second protrusion 12 and the electrode 7. It is arranged between the side surface 7b.
　図５Ａおよび図５Ｂに示す実施形態では、角部５３，５４，５５，５６のそれぞれは、曲線形状を有している。一実施形態では、角部５３，５４，５５，５６のうちの少なくとも１つは、曲線形状を有してもよい。曲面としての角部５３，５４，５５，５６の曲率を変えることにより、シャント抵抗器１は、突出部１１，１２に流れ込む電流を変更することができる。結果として、シャント抵抗器１は、その抵抗温度係数を調整することができる。 5A and 5B, each of the corners 53, 54, 55, 56 has a curved shape. In one embodiment, at least one of corners 53, 54, 55, 56 may have a curvilinear shape. By changing the curvature of the corners 53 , 54 , 55 , 56 as curved surfaces, the shunt resistor 1 can change the current flowing into the protrusions 11 , 12 . As a result, the shunt resistor 1 can adjust its temperature coefficient of resistance.
　角部５３，５４，５５，５６は、同一の曲率（または曲率半径）を有してもよく、異なる曲率（または曲率半径）を有してもよい。曲率を小さくすることにより（すなわち、曲率半径を大きくすることにより）、温度上昇に伴う抵抗値の変化率を正側に変化させることができる。逆に、曲率を大きくすることにより（すなわち、曲率半径を小さくすることにより）、温度上昇に伴う抵抗値の変化率を負側に変化させることができる。このように、本実施形態では、シャント抵抗器１の抵抗温度係数を調整することができる。 The corners 53, 54, 55, 56 may have the same curvature (or radius of curvature) or may have different curvatures (or radius of curvature). By reducing the curvature (that is, by increasing the radius of curvature), the rate of change of the resistance value with temperature rise can be changed to the positive side. Conversely, by increasing the curvature (that is, by decreasing the radius of curvature), the rate of change in resistance value with temperature rise can be changed to the negative side. Thus, in this embodiment, the temperature coefficient of resistance of the shunt resistor 1 can be adjusted.
　図６Ａおよび図６Ｂは、角部の他の実施形態を示す図である。図６Ａおよび図６Ｂに示すように、角部５３，５４，５５，５６の少なくとも１つは、鈍角形状または直線形状を有してもよい。図６Ａに示す実施形態では、角部５３の角度θ１は９０度よりも大きく、１８０度よりも小さな角度である（すなわち、鈍角形状）。図６Ｂに示す実施形態では、角部５３の角度θ２は１８０度である（すなわち、直線形状）。このような構成によっても、シャント抵抗器１の抵抗温度係数を調整することができる。 6A and 6B are diagrams showing other embodiments of corners. As shown in Figures 6A and 6B, at least one of the corners 53, 54, 55, 56 may have an obtuse or rectilinear shape. In the embodiment shown in FIG. 6A, angle θ1 of corner 53 is greater than 90 degrees and less than 180 degrees (ie obtuse). In the embodiment shown in FIG. 6B, angle θ2 of corner 53 is 180 degrees (ie, linear shape). With such a configuration, the temperature coefficient of resistance of the shunt resistor 1 can also be adjusted.
　図７は、一実施形態に係るシャント抵抗器を備えた電流検出装置を示す図である。図７に示すように、電流検出装置３０は、シャント抵抗器１と、抵抗体５の電圧を外部に出力する電圧出力装置３１と、を備えている。電圧出力装置３１は、シャント抵抗器１に接続されている。電圧出力装置３１は、シャント抵抗器１からの電圧信号（抵抗体５の電圧）を出力するための出力コネクタ（出力端子）３５を備えている。 FIG. 7 is a diagram showing a current detection device with a shunt resistor according to one embodiment. As shown in FIG. 7, the current detection device 30 includes a shunt resistor 1 and a voltage output device 31 that outputs the voltage of the resistor 5 to the outside. A voltage output device 31 is connected to the shunt resistor 1 . The voltage output device 31 has an output connector (output terminal) 35 for outputting a voltage signal (voltage of the resistor 5) from the shunt resistor 1. FIG.
　電圧出力装置３１は、電流検出回路基板３４をさらに備えている。電流検出回路基板３４は、シャント抵抗器１からの電圧信号（抵抗体５の電圧）を出力コネクタ３５に伝達する電圧信号配線４６Ａ，４６Ｂ，４６Ｃ，４６Ｄと、グランド配線５０，５１と、を有している。電圧信号配線４６Ａ，４６Ｂ，４６Ｃ，４６Ｄは電圧検出回路基板３４上に線対称となるように配線されている。電流検出回路基板３４は、シャント抵抗器１上に配置されている。 The voltage output device 31 further includes a current detection circuit board 34. The current detection circuit board 34 has voltage signal wirings 46A, 46B, 46C, and 46D for transmitting the voltage signal (voltage of the resistor 5) from the shunt resistor 1 to the output connector 35, and ground wirings 50 and 51. are doing. The voltage signal wirings 46A, 46B, 46C, and 46D are wired on the voltage detection circuit board 34 so as to be line symmetrical. A current detection circuit board 34 is arranged on the shunt resistor 1 .
　電流検出回路基板３４は、電圧端子用パッド（より具体的には、銅箔部）３６Ａ，３６Ｂ，３６Ｃ，３６Ｄをさらに備えている。電圧信号配線４６Ａの一端は電圧端子用パッド３６Ａに接続されており、他端は出力コネクタ３５に接続されている。電圧信号配線４６Ｂの一端は電圧端子用パッド３６Ｂに接続されており、他端は出力コネクタ３５に接続されている。電圧信号配線４６Ｃの一端は電圧端子用パッド３６Ｃに接続されており、他端は出力コネクタ３５に接続されている。電圧信号配線４６Ｄの一端は電圧端子用パッド３６Ｄに接続されており、他端は出力コネクタ３５に接続されている。グランド配線５０の一端は電圧端子用パッド３６Ｄ（または電圧端子用パッド３６Ｃ）に接続されており、他端は出力コネクタ３５に接続されている。グランド配線５１の一端は電圧端子用パッド３６Ｃ（または電圧端子用パッド３６Ｄ）に接続されている。 The current detection circuit board 34 further includes voltage terminal pads (more specifically, copper foil portions) 36A, 36B, 36C, and 36D. One end of the voltage signal wiring 46 A is connected to the voltage terminal pad 36 A, and the other end is connected to the output connector 35 . One end of the voltage signal wiring 46 B is connected to the voltage terminal pad 36 B, and the other end is connected to the output connector 35 . One end of the voltage signal wiring 46C is connected to the voltage terminal pad 36C, and the other end is connected to the output connector 35. As shown in FIG. One end of the voltage signal wiring 46D is connected to the voltage terminal pad 36D, and the other end is connected to the output connector 35. As shown in FIG. One end of the ground wiring 50 is connected to the voltage terminal pad 36D (or voltage terminal pad 36C), and the other end is connected to the output connector 35 . One end of the ground wiring 51 is connected to the voltage terminal pad 36C (or the voltage terminal pad 36D).
　電圧端子用パッド３６Ａは、電流検出回路基板３４の内部配線（図示しない）を介して第１突出部１１の電圧検出部２１の電圧検出位置１６Ａに電気的に接続されている。電圧端子用パッド３６Ｂは、電流検出回路基板３４の内部配線（図示しない）を介して第２突出部１２の電圧検出部２３の電圧検出位置１６Ｂに電気的に接続されている。電圧端子用パッド３６Ｃは、電流検出回路基板３４の内部配線（図示しない）を介して第２突出部１２の電圧検出部２４の電圧検出位置１６Ｃに電気的に接続されている。電圧端子用パッド３６Ｄは、電流検出回路基板３４の内部配線（図示しない）を介して第１突出部１１の電圧検出部２２の電圧検出位置１６Ｄに電気的に接続されている。 The voltage terminal pad 36A is electrically connected to the voltage detection position 16A of the voltage detection portion 21 of the first projecting portion 11 via internal wiring (not shown) of the current detection circuit board 34. The voltage terminal pad 36B is electrically connected to the voltage detection position 16B of the voltage detection portion 23 of the second projecting portion 12 via internal wiring (not shown) of the current detection circuit board 34 . The voltage terminal pad 36</b>C is electrically connected to the voltage detection position 16</b>C of the voltage detection portion 24 of the second projecting portion 12 via internal wiring (not shown) of the current detection circuit board 34 . The voltage terminal pad 36</b>D is electrically connected to the voltage detection position 16</b>D of the voltage detection portion 22 of the first projecting portion 11 via internal wiring (not shown) of the current detection circuit board 34 .
　上記内部配線と電圧検出部２１，２２，２３，２４とは、半田付けなどの手段により接続される。一実施形態では、電圧検出部２１，２２，２３，２４上に、半田付けなどの手段により電圧検出端子（垂直に延びる導電性のピン）を設け、電圧検出端子に導線（例えば、アルミワイヤー）を接続する手段や、回路基板に形成したスルーホールに電圧検出端子を挿通する手段により接続してもよい。 The internal wiring and the voltage detection units 21, 22, 23, and 24 are connected by means such as soldering. In one embodiment, voltage detection terminals (vertically extending conductive pins) are provided on the voltage detection units 21, 22, 23, and 24 by means of soldering or the like, and the voltage detection terminals are connected to conductive wires (eg, aluminum wires). or a means for inserting the voltage detection terminal into a through hole formed in the circuit board.
　作業者は、出力コネクタ３５に嵌合するコネクタを備えたケーブルを接続して抵抗体５の両端５ａ，５ｂに発生した電圧を測定する。このような構成により、簡単に抵抗体５の電圧を測定することができる。一実施形態では、シャント抵抗器１からの電圧信号を増幅するためのオペアンプ（増幅器）、Ａ／Ｄ変換器、および／または温度センサなどを電流検出回路基板３４に搭載してもよい。 The operator connects a cable with a connector that fits to the output connector 35 and measures the voltage generated at both ends 5 a and 5 b of the resistor 5 . With such a configuration, the voltage of the resistor 5 can be easily measured. In one embodiment, current detection circuit board 34 may include an operational amplifier (amplifier) for amplifying the voltage signal from shunt resistor 1, an A/D converter, and/or a temperature sensor.
　図７に示すように、電流検出装置３０は、出力コネクタ３５および電流検出回路基板３４を介してシャント抵抗器１に接続された電圧演算部６５を備えている。電圧演算部６５は、シャント抵抗器１の検出電圧値を決定する演算装置であり、電圧演算部６５の一例として、マイクロコンピュータまたは電圧演算回路を挙げることができる。一実施形態では、電圧演算部６５を電流検出回路基板３４に備えてもよい。 As shown in FIG. 7, the current detection device 30 includes a voltage calculator 65 connected to the shunt resistor 1 via the output connector 35 and the current detection circuit board 34 . The voltage calculation section 65 is a calculation device that determines the detected voltage value of the shunt resistor 1, and an example of the voltage calculation section 65 is a microcomputer or a voltage calculation circuit. In one embodiment, the voltage calculator 65 may be provided on the current detection circuit board 34 .
　電圧演算部６５は、電圧検出部２１と電圧検出部２２との間で測定された電圧値と、電圧検出部２３と電圧検出部２４との間で測定された電圧値と、を組み合わせた電圧値を平均化し、平均化された電圧値を検出電圧値に決定するように構成されている。このように、電圧演算部６５は、シャント抵抗器１の第１方向に沿って配置された電圧検出部で測定された電圧の平均値を検出電圧値に決定してもよい。 Voltage calculation unit 65 calculates a voltage obtained by combining the voltage value measured between voltage detection unit 21 and voltage detection unit 22 and the voltage value measured between voltage detection unit 23 and voltage detection unit 24. It is configured to average the values and determine the averaged voltage value as the detected voltage value. In this way, the voltage calculator 65 may determine the average value of the voltages measured by the voltage detectors arranged along the first direction of the shunt resistor 1 as the detected voltage value.
　このような構成により、電圧演算部６５は、シャント抵抗器１の材料や形状などのばらつきによって抵抗温度係数が影響を受けたとしても、より安定的な検出電圧を出力することができる。 With such a configuration, the voltage calculation unit 65 can output a more stable detected voltage even if the temperature coefficient of resistance is affected by variations in the material, shape, etc. of the shunt resistor 1 .
　一実施形態では、電圧演算部６５は、電圧検出部２１と電圧検出部２４との間で測定された電圧値と、電圧検出部２２と電圧検出部２３との間で測定された電圧値と、を組み合わせた電圧値を平均化し、平均化された電圧値を検出電圧値に決定するように構成されてもよい。このように、電圧演算部６５は、シャント抵抗器１の第２方向において、対角線上に配置された電圧検出部で測定された電圧の平均値を検出電圧値に決定してもよい。 In one embodiment, the voltage calculation unit 65 calculates the voltage value measured between the voltage detection unit 21 and the voltage detection unit 24 and the voltage value measured between the voltage detection unit 22 and the voltage detection unit 23. , are averaged, and the averaged voltage value is determined as the detected voltage value. In this way, the voltage calculator 65 may determine the average value of the voltages measured by the voltage detectors arranged on the diagonal line in the second direction of the shunt resistor 1 as the detected voltage value.
　一実施形態では、電圧演算部６５は、電圧検出部２１と電圧検出部２４との間で測定された電圧値、または電圧検出部２２と電圧検出部２３との間で測定された電圧値を検出電圧値に決定するように構成されている。このように、電圧演算部６５は、シャント抵抗器１の第２方向において、対角線上に配置された電圧検出部で測定された電圧値を検出電圧値に決定してもよい。 In one embodiment, the voltage calculation unit 65 calculates the voltage value measured between the voltage detection unit 21 and the voltage detection unit 24 or the voltage value measured between the voltage detection unit 22 and the voltage detection unit 23. It is configured to determine the detected voltage value. In this way, the voltage calculation section 65 may determine the voltage value measured by the voltage detection section arranged diagonally in the second direction of the shunt resistor 1 as the detected voltage value.
　図８Ａ乃至図８Ｄは、比較例として、片側のみに突出部を備える従来のシャント抵抗器に接続された配線部材を示す図である。図９Ａ乃至図９Ｄは、一実施形態に係るシャント抵抗器に接続された配線部材を示す図である。図８Ａ乃至図８Ｄにおける矢印、および図９Ａ乃至図９Ｄにおける矢印は、電流の流れ方向を示している。図９Ａでは、配線部材４０，４１はシャント抵抗器１の第１方向に沿って電極６，７に接続されている。図９Ａに示す配置を、便宜的に、直列配置と呼ぶことがある。 8A to 8D are diagrams showing a wiring member connected to a conventional shunt resistor having a protrusion on only one side as a comparative example. 9A-9D illustrate wiring members connected to a shunt resistor according to one embodiment. Arrows in FIGS. 8A to 8D and arrows in FIGS. 9A to 9D indicate the direction of current flow. 9A, wiring members 40, 41 are connected to electrodes 6, 7 along the first direction of shunt resistor 1. In FIG. For convenience, the arrangement shown in FIG. 9A may be referred to as a serial arrangement.
　図９Ｂでは、配線部材４０，４１は、第１突出部１１側に延びるように、第２方向に沿って電極６，７に接続されている。図９Ｂに示す配置を、便宜的に、Ｕ字配置と呼ぶことがある。図９Ｃでは、配線部材４０，４１は、第２突出部１２側に延びるように、第２方向に沿って電極６，７に接続されている。図９Ｃに示す配置を、便宜的に、逆Ｕ字配置と呼ぶことがある。 In FIG. 9B, the wiring members 40 and 41 are connected to the electrodes 6 and 7 along the second direction so as to extend toward the first protrusion 11 side. For convenience, the arrangement shown in FIG. 9B may be referred to as a U-shaped arrangement. In FIG. 9C, the wiring members 40 and 41 are connected to the electrodes 6 and 7 along the second direction so as to extend toward the second projection 12 side. For convenience, the arrangement shown in FIG. 9C may be referred to as an inverted U-shaped arrangement.
　図９Ｄでは、配線部材４０は、第１突出部１１側に延びるように、第２方向に沿って電極６に接続されており、配線部材４１は、第２突出部１２側に延びるように、第２方向に沿って電極７に接続されている。図９Ｄに示す配置を、便宜的に、Ｓ字配置と呼ぶことがある。 In FIG. 9D, the wiring member 40 is connected to the electrode 6 along the second direction so as to extend toward the first projecting portion 11, and the wiring member 41 extends toward the second projecting portion 12. It is connected to the electrode 7 along the second direction. For convenience, the arrangement shown in FIG. 9D may be referred to as an S-shaped arrangement.
　図８Ａ乃至図８Ｄにおいて、シャント抵抗器は、本実施形態に係るシャント抵抗器１の突出部１２に相当する突出部を有していない。図８Ａでは、シャント抵抗器は直列的に配置されており、図８Ｂでは、シャント抵抗器は、Ｕ字状に配置されており、図８Ｃでは、シャント抵抗器は、逆Ｕ字状に配置されており、図８Ｄでは、シャント抵抗器は、Ｓ字状に配置されている。 In FIGS. 8A to 8D, the shunt resistor does not have a protrusion corresponding to the protrusion 12 of the shunt resistor 1 according to this embodiment. In FIG. 8A the shunt resistors are arranged in series, in FIG. 8B the shunt resistors are arranged in a U shape and in FIG. 8C the shunt resistors are arranged in an inverted U shape. 8D, the shunt resistors are arranged in an S-shape.
　図１０は、比較例としての片側のみに突出部を備える従来のシャント抵抗器の、温度変化に伴う抵抗値の変化率を示すグラフである。図１１は、本実施形態に係るシャント抵抗器の、温度変化に伴う抵抗値の変化率を示すグラフである。図１０および図１１のそれぞれにおいて、横軸はシャント抵抗器の温度を示しており、縦軸はシャント抵抗器の抵抗値の変化率を示している。 FIG. 10 is a graph showing the rate of change in resistance value with temperature change of a conventional shunt resistor having a protrusion on only one side as a comparative example. FIG. 11 is a graph showing the rate of change in resistance value of the shunt resistor according to this embodiment with temperature change. In each of FIGS. 10 and 11, the horizontal axis indicates the temperature of the shunt resistor, and the vertical axis indicates the change rate of the resistance value of the shunt resistor.
　図１１では、電圧検出部２１と電圧検出部２４との間で測定された電圧値と、電圧検出部２２と電圧検出部２３との間で測定された電圧値と、を組み合わせた電圧値を平均化し、平均化された電圧値を検出電圧値としたときの抵抗値の変化率が示されている。 In FIG. 11, the voltage value obtained by combining the voltage value measured between the voltage detection unit 21 and the voltage detection unit 24 and the voltage value measured between the voltage detection unit 22 and the voltage detection unit 23 is The change rate of the resistance value is shown when the averaged voltage value is used as the detected voltage value.
　×点を結ぶ曲線は、配線部材４０，４１が直列配置されたときのシャント抵抗器の抵抗値の変化率を示しており、△点を結ぶ曲線は、配線部材４０，４１がＵ字配置されたときのシャント抵抗器の抵抗値の変化率を示しており、○点を結ぶ曲線は、配線部材４０，４１が逆Ｕ字配置されたときのシャント抵抗器の抵抗値の変化率を示している。 A curve connecting points x indicates the rate of change in the resistance value of the shunt resistor when the wiring members 40 and 41 are arranged in series, and a curve connecting points Δ indicates the rate of change in the resistance value of the wiring members 40 and 41 when the wiring members 40 and 41 are arranged in a U shape. The curve connecting the circles shows the rate of change in the resistance value of the shunt resistor when the wiring members 40 and 41 are arranged in an inverted U shape. there is
　図１０に示すように、配線部材４０，４１が直列配置された場合、シャント抵抗器の抵抗値の変化率は低いが、配線部材４０，４１がＵ字配置および逆Ｕ字配置された場合、シャント抵抗器の抵抗値の変化率は非常に高い。このように、片側のみに突出部を備える従来のシャント抵抗器の構造では、配線部材４０，４１の、シャント抵抗器への接続方向によって抵抗値変化率が異なるため、結果として、シャント抵抗器の取り付け位置を制限する等、設計上の制約になることがある。 As shown in FIG. 10, when the wiring members 40 and 41 are arranged in series, the rate of change in the resistance value of the shunt resistor is low. The rate of change of resistance of the shunt resistor is very high. As described above, in the structure of the conventional shunt resistor having a protrusion on only one side, the rate of change in resistance varies depending on the direction in which the wiring members 40 and 41 are connected to the shunt resistor. It may be a design restriction such as restricting the mounting position.
　その一方で、図１１に示すように、配線部材４０，４１が直線上に配置されない、例えば、配線部材４０，４１がＵ字配置された場合、シャント抵抗器１の抵抗値の変化率は、片側のみに突出部を備えるシャント抵抗器の抵抗値の変化率よりも著しく低い。配線部材４０，４１が逆Ｕ字配置された場合であっても、同様に、シャント抵抗器１の抵抗値の変化率は著しく低い。図１１から明らかなように、本実施形態では、配線部材４０，４１の配置にかかわらず、シャント抵抗器１の抵抗値の変化率は著しく低い。 On the other hand, as shown in FIG. 11, when the wiring members 40 and 41 are not arranged on a straight line, for example, when the wiring members 40 and 41 are arranged in a U shape, the rate of change in the resistance value of the shunt resistor 1 is It is significantly lower than the rate of change of resistance of a shunt resistor with protrusions on only one side. Similarly, even when the wiring members 40 and 41 are arranged in an inverted U shape, the change rate of the resistance value of the shunt resistor 1 is remarkably low. As is clear from FIG. 11, in this embodiment, regardless of the arrangement of the wiring members 40 and 41, the change rate of the resistance value of the shunt resistor 1 is remarkably low.
　本実施形態によれば、シャント抵抗器１は、第１突出部１１および第２突出部１２を有しているため、シャント抵抗器１は、配線部材４０，４１の配置によって変化することなく、抵抗値を測定することができる。言い換えれば、シャント抵抗器１は、自身に流れる電流経路によって変化することなく、抵抗値を測定することができる。 According to this embodiment, since the shunt resistor 1 has the first projecting portion 11 and the second projecting portion 12, the shunt resistor 1 does not change depending on the arrangement of the wiring members 40 and 41. Resistance can be measured. In other words, the shunt resistor 1 can measure the resistance value without being changed by the current path through itself.
　本実施形態によれば、シャント抵抗器１は、自身の抵抗値の変化率を全体的に低減することができる。このようなシャント抵抗器１を採用することにより、配線部材４０，４１の、シャント抵抗器１への接続方向にかかわらず、安定した電流検出が可能となり、結果として、シャント抵抗器１の取り付け位置の設計上の自由度が増す。なお、図１１では示されていないが、配線部材４０，４１をＳ字配置した場合であっても、シャント抵抗器１の抵抗値の変化率を著しく低減させることができる。 According to this embodiment, the shunt resistor 1 can reduce the change rate of its own resistance value as a whole. By adopting such a shunt resistor 1, stable current detection is possible regardless of the connection direction of the wiring members 40 and 41 to the shunt resistor 1. As a result, the mounting position of the shunt resistor 1 Increased design freedom. Although not shown in FIG. 11, even when the wiring members 40 and 41 are arranged in an S shape, the change rate of the resistance value of the shunt resistor 1 can be significantly reduced.
　さらに本実施形態によれば、温度変化による熱膨張または熱収縮に起因して、配線部材４０，４１の、シャント抵抗器１との接点位置が変化し、電流経路が変化したとしても、シャント抵抗器１の抵抗温度係数に与える影響を小さくすることができる。 Furthermore, according to the present embodiment, even if the contact positions of the wiring members 40 and 41 with the shunt resistor 1 change due to thermal expansion or contraction due to temperature change, and the current path changes, the shunt resistance The influence on the temperature coefficient of resistance of the device 1 can be reduced.
　図１２は、シャント抵抗器の他の実施形態を示す図である。図１２に示すように、シャント抵抗器１は、第１側面Ｓ１に形成された第１凹部７１と、第２側面Ｓ２に形成された第２凹部７２と、を有している。図１２に示す実施形態では、第１突出部１１は第１凹部７１に配置されており、第２突出部１２は第２凹部７２に配置されている。 FIG. 12 is a diagram showing another embodiment of the shunt resistor. As shown in FIG. 12, the shunt resistor 1 has a first recess 71 formed on the first side S1 and a second recess 72 formed on the second side S2. In the embodiment shown in FIG. 12, the first projection 11 is arranged in the first recess 71 and the second projection 12 is arranged in the second recess 72 .
　このような配置により、第１突出部１１と電極６との間には、スリット７１ｂが形成され、第１突出部１１と電極７との間には、スリット７１ａが形成される。同様に、第２突出部１２と電極６との間には、スリット７２ｂが形成され、第２突出部１２と電極７との間には、スリット７２ａが形成される。 With this arrangement, a slit 71b is formed between the first projecting portion 11 and the electrode 6, and a slit 71a is formed between the first projecting portion 11 and the electrode 7. Similarly, a slit 72 b is formed between the second projecting portion 12 and the electrode 6 and a slit 72 a is formed between the second projecting portion 12 and the electrode 7 .
　図１２に示す実施形態においても、シャント抵抗器１は、第１突出部１１および第２突出部１２を有するため、上述した実施形態と同様の効果を奏することができる。 Also in the embodiment shown in FIG. 12, the shunt resistor 1 has the first projecting portion 11 and the second projecting portion 12, so that the same effect as the embodiment described above can be achieved.
　上述した実施形態は、本発明が属する技術分野における通常の知識を有する者が本発明を実施できることを目的として記載されたものである。上記実施形態の種々の変形例は、当業者であれば当然になしうることであり、本発明の技術的思想は他の実施形態にも適用しうる。したがって、本発明は、記載された実施形態に限定されることはなく、特許請求の範囲によって定義される技術的思想に従った最も広い範囲に解釈されるものである。 The above-described embodiments are described for the purpose of enabling those who have ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiments can be made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in its broadest scope in accordance with the technical spirit defined by the claims.
　本発明は、シャント抵抗器および電流検出装置に利用可能である。 The present invention can be used for shunt resistors and current detection devices.
　１　　　シャント抵抗器
　５　　　抵抗体
５ａ，５ｂ　　　両側接続面
　６　　　電極
６ａ　　　接触面
６ｂ，６ｃ　　　側面
　７　　　電極
７ａ　　　接触面
７ｂ，７ｃ　　　側面
８，９　　ボルト穴
１１　　　第１突出部
１１ａ，１１ｂ　　　側面
１２　　　第２突出部
１２ａ，１２ｂ　　　側面
１６Ａ，１６Ｂ，１６Ｃ，１６Ｄ　　　電圧検出位置
２１，２２，２３，２４　　　電圧検出部
３０　　　電流検出装置
３１　　　電圧出力装置
３４　　　電流検出回路基板
３５　　　出力コネクタ
３６Ａ，３６Ｂ，３６Ｃ，３６Ｄ　　　電圧端子用パッド
４０，４１　　　配線部材
４６Ａ，４６Ｂ，４６Ｃ，４６Ｄ　　　電圧信号配線
４８，４９　　　ボルト穴
５０，５１　　　グランド配線
５３，５４，５５，５６　　　角部
６５　　　電圧演算部
７１　　　第１凹部
７１ａ，７１ｂ　　　スリット
７２　　　第２凹部
７２ａ，７２ｂ　　　スリット Reference Signs List 1 shunt resistor 5 resistor 5a, 5b both side connection surfaces 6 electrode 6a contact surface 6b, 6c side surface 7 electrode 7a contact surface 7b, 7c side surface 8, 9 bolt hole 11 first projecting portion 11a, 11b side surface 12 second projecting portion 12a, 12b Sides 16A, 16B, 16C, 16D Voltage detection positions 21, 22, 23, 24 Voltage detection unit 30 Current detection device 31 Voltage output device 34 Current detection circuit board 35 Output connectors 36A, 36B, 36C, 36D For voltage terminals Pads 40, 41 Wiring members 46A, 46B, 46C, 46D Voltage signal wirings 48, 49 Bolt holes 50, 51 Ground wirings 53, 54, 55, 56 Corners 65 Voltage calculator 71 First recesses 71a, 71b Slits 72 Second Recesses 72a, 72b Slit

Claims (9)

  1. 　電流検出に用いられるシャント抵抗器であって、
    　抵抗体と、
    　第１方向における前記抵抗体の両端に接続された一対の電極と、を備え、
    　前記シャント抵抗器は、
    　　前記第１方向に平行な面である、前記シャント抵抗器の第１側面に形成された第１突出部と、
    　　前記第１側面の反対側の面である前記シャント抵抗器の第２側面に形成された第２突出部と、を有しており、
    　前記第１突出部は、前記抵抗体の一部および前記一対の電極の一部を有しており、
    　前記第２突出部は、前記抵抗体の一部および前記一対の電極の一部を有している、シャント抵抗器。     A shunt resistor used for current sensing,
    a resistor;
    a pair of electrodes connected to both ends of the resistor in a first direction;
    The shunt resistor is
    a first protrusion formed on a first side surface of the shunt resistor, which is parallel to the first direction;
    a second protrusion formed on a second side of the shunt resistor opposite to the first side;
    The first projecting portion has a portion of the resistor and a portion of the pair of electrodes,
    A shunt resistor, wherein the second projection has a portion of the resistor and a portion of the pair of electrodes.
  2. 　前記第１突出部は、前記第１方向における前記抵抗体の両端に接続された第１電圧検出部および第２電圧検出部を有しており、
    　前記第２突出部は、前記第１方向における前記抵抗体の両端に接続された第３電圧検出部および第４電圧検出部を有しており、
    　前記第１電圧検出部および前記第３電圧検出部は、同一の電極に配置されており、
    　前記第２電圧検出部および前記第４電圧検出部は、同一の電極に配置されている、請求項１に記載のシャント抵抗器。     The first projecting portion has a first voltage detecting portion and a second voltage detecting portion connected to both ends of the resistor in the first direction,
    The second projecting portion has a third voltage detecting portion and a fourth voltage detecting portion connected to both ends of the resistor in the first direction,
    The first voltage detection unit and the third voltage detection unit are arranged on the same electrode,
    2. The shunt resistor according to claim 1, wherein said second voltage detector and said fourth voltage detector are arranged on the same electrode.
  3. 　前記第１突出部は、前記一対の電極に接続された第１角部および第２角部を有しており、
    　前記第２突出部は、前記一対の電極に接続された第３角部および第４角部を有しており、
    　前記第１角部、前記第２角部、前記第３角部、および前記第４角部の少なくとも１つは、鈍角形状、直線形状または曲線形状を有している、請求項１または請求項２に記載のシャント抵抗器。     The first protrusion has a first corner and a second corner connected to the pair of electrodes,
    The second projecting portion has a third corner and a fourth corner connected to the pair of electrodes,
    At least one of the first corner, the second corner, the third corner, and the fourth corner has an obtuse angle, a linear shape, or a curved shape. 3. The shunt resistor according to 2.
  4. 　前記シャント抵抗器は、
    　　前記第１側面に形成された第１凹部と、
    　　前記第２側面に形成された第２凹部と、を有しており、
    　前記第１突出部は、前記第１凹部に配置されており、
    　前記第２突出部は、前記第２凹部に配置されている、請求項１～請求項３のいずれか一項に記載のシャント抵抗器。     The shunt resistor is
    a first recess formed on the first side surface;
    a second recess formed on the second side surface;
    The first protrusion is arranged in the first recess,
    The shunt resistor according to any one of claims 1 to 3, wherein said second protrusion is arranged in said second recess.
  5. 　請求項１～請求項４のいずれか一項に記載のシャント抵抗器と、
    　前記シャント抵抗器からの電圧信号を伝達する電圧信号配線を有する電流検出回路基板と、を備え、
    　前記電圧信号配線は、前記第１突出部の第１電圧検出部および第２電圧検出部と、前記第２突出部の第３電圧検出部および第４電圧検出部と、に電気的に接続されている、電流検出装置。     A shunt resistor according to any one of claims 1 to 4;
    a current detection circuit board having a voltage signal wiring that transmits a voltage signal from the shunt resistor,
    The voltage signal wiring is electrically connected to the first voltage detection section and the second voltage detection section of the first protrusion, and the third voltage detection section and the fourth voltage detection section of the second protrusion. current sensing device.
  6. 　前記電流検出回路基板は、電圧端子用パッドをさらに有しており、
    　前記電圧端子用パッドは、前記第１電圧検出部、前記第２電圧検出部、前記第３電圧検出部、前記第４電圧検出部、および前記電圧信号配線に接続されている、請求項５に記載の電流検出装置。     The current detection circuit board further has voltage terminal pads,
    6. The voltage terminal pad according to claim 5, wherein said voltage terminal pad is connected to said first voltage detection section, said second voltage detection section, said third voltage detection section, said fourth voltage detection section, and said voltage signal wiring. A current sensing device as described.
  7. 　前記電流検出装置は、前記シャント抵抗器に接続された電圧演算部を備えており、
    　前記電圧演算部は、
    　　前記第１電圧検出部と前記第２電圧検出部との間で測定された電圧値と、前記第３電圧検出部と前記第４電圧検出部との間で測定された電圧値と、を組み合わせた電圧値を平均化し、
    　　前記平均化された電圧値を検出電圧値に決定する、請求項５または請求項６に記載の電流検出装置。     The current detection device includes a voltage calculator connected to the shunt resistor,
    The voltage calculation unit is
    combining the voltage value measured between the first voltage detection section and the second voltage detection section and the voltage value measured between the third voltage detection section and the fourth voltage detection section; average the voltage values obtained,
    7. The current detection device according to claim 5, wherein said averaged voltage value is determined as a detected voltage value.
  8. 　前記電流検出装置は、前記シャント抵抗器に接続された電圧演算部を備えており、
    　前記電圧演算部は、
    　　前記第１電圧検出部と前記第４電圧検出部との間で測定された電圧値、または前記第２電圧検出部と前記第３電圧検出部との間で測定された電圧値を検出電圧値に決定する、請求項５または請求項６に記載の電流検出装置。     The current detection device includes a voltage calculator connected to the shunt resistor,
    The voltage calculation unit is
    A detected voltage value is a voltage value measured between the first voltage detection section and the fourth voltage detection section or a voltage value measured between the second voltage detection section and the third voltage detection section. 7. The current detection device according to claim 5 or 6, wherein the current detection device determines:
  9. 　前記電流検出装置は、前記シャント抵抗器に接続された電圧演算部を備えており、
    　前記電圧演算部は、
    　　前記第１電圧検出部と前記第４電圧検出部との間で測定された電圧値と、前記第２電圧検出部と前記第３電圧検出部との間で測定された電圧値と、を組み合わせた電圧値を平均化し、
    　　前記平均化された電圧値を検出電圧値に決定する、請求項５または請求項６に記載の電流検出装置。     The current detection device includes a voltage calculator connected to the shunt resistor,
    The voltage calculation unit is
    combining the voltage value measured between the first voltage detection section and the fourth voltage detection section and the voltage value measured between the second voltage detection section and the third voltage detection section; average the voltage values obtained,
    7. The current detection device according to claim 5, wherein said averaged voltage value is determined as a detected voltage value.
PCT/JP2022/037221 2021-12-14 2022-10-05 Shunt resistor and current detection device WO2023112438A1 (en)

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DE202021105281U1 (en) * 2021-02-11 2021-10-12 Isabellenhütte Heusler Gmbh & Co. Kg Current sense resistor
JP2021174802A (en) * 2020-04-20 2021-11-01 Koa株式会社 Shunt resistor
JP2021176195A (en) * 2020-04-27 2021-11-04 Koa株式会社 Shunt resistor, shunt resistor manufacturing method, and current detection device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016514841A (en) * 2013-04-05 2016-05-23 イザベレンヒュッテ ホイスラー ゲー・エム・ベー・ハー ウント コンパニー コマンデイトゲゼルシャフト Measuring resistor and corresponding measuring method
JP2021174802A (en) * 2020-04-20 2021-11-01 Koa株式会社 Shunt resistor
JP2021176195A (en) * 2020-04-27 2021-11-04 Koa株式会社 Shunt resistor, shunt resistor manufacturing method, and current detection device
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