JP2016161304A - Resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of measuring the quantity measured by a resistor, and improve the manufacturing efficiency.SOLUTION: A resistor includes: a substrate 11; a resistive element 12 provided for the substrate 11; a current terminal C1 provided for a first region 11a of the substrate 11 and connected to one end 12a of the resistive element 12 through a wire W1 provided for the substrate 11; a current terminal C2 provided for a second region 11b of the substrate 11 and connected to the other end 12b of the resistive element 12 through a wire W2 provided for the substrate 11; voltage terminals P1, P2 connected to the one end 12a and the other end 12b of the resistive element 12, respectively; a current terminal C3 provided for the first region 11a; a current terminal C4 provided for the second region 11b; and a wire W3 provided for the substrate 11 along a current path Cc including the wires W1, W2 and the resistive element 12 and connecting the current terminals C3, C4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resistor including a first current input / output terminal, a second current input / output terminal, and a pair of voltage detection terminals.

  As this type of resistor, a current detection resistor disclosed in Patent Document 1 below is known. The current detection resistor includes a pair of resistor layers (a right resistor layer and a left resistor layer), a pair of current electrodes for flowing a current to be measured, and a pair of voltage electrodes for extracting a voltage difference. These are formed on an insulating substrate. In this current detection resistor, each resistor layer is disposed so that each side of each resistor layer faces each other (that is, in parallel), and each resistor layer is connected in parallel to the current electrode. Has been. Further, in this current detection resistor, each voltage electrode is arranged at a central portion (a position spaced apart from each resistor layer at equal intervals) between the resistor layers arranged to face each other. For this reason, in this current detection resistor, when a current to be measured flows, an equal current flows in parallel to each resistor layer, and the magnetic field generated by the current is changed to the arrangement position of each voltage electrode (each resistor As a result of being synthesized (acting in opposite directions) at the center between the layers, the error due to the voltage generated by the mutual inductance for each voltage electrode can be kept small, so that the measured current can be measured accurately It is possible to do.

JP 2009-250731 A (page 8-10, FIG. 1)

  However, the current detection resistor has the following problems. That is, the current detection resistor has a complicated structure because it is necessary to provide a pair of resistor layers. Further, in this current detection resistor, each resistor layer is configured to suppress the influence of mutual inductance by causing magnetic fields generated from each resistor layer to act in opposite directions when a current to be measured flows. As a result, it is necessary to make the resistance value and length equal to each other, so that a highly accurate manufacturing process is required. Therefore, this current detection resistor has a problem that it is difficult to improve manufacturing efficiency. In addition, in this current detection resistor, since each voltage electrode is arranged between each resistor layer, it is necessary to connect the current electrode and the voltage electrode with a wiring. There is also a problem that the measurement accuracy of the current to be measured may be lowered.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a resistor that can improve the measurement accuracy of a measured amount and the manufacturing efficiency.

  To achieve the above object, a resistor according to claim 1 is provided with a support, a resistor disposed on the support, and one end of the resistor via a first wiring disposed on the support. The resistor via a first current input / output terminal disposed in a first region of the support body, which is connected to the first end portion, and the second wire disposed in the support body. A second current input / output terminal disposed in a second region where the other end of the support is located, and the one end and the other end of the resistor. A resistor having a pair of voltage detection terminals connected to each other, a third current input / output terminal arranged in the first region, and a fourth arranged in the second region. The current input / output terminal and the current path formed by the first wiring, the second wiring, and the resistor. Together they are disposed lifting member and a third wiring connecting the third current input terminal and the fourth current input terminal.

  The resistor according to claim 2 is the resistor according to claim 1, wherein the first current input / output terminal, the second current input / output terminal, the third current input / output terminal, And a pair of the fourth current input / output terminals, and one of each of the pair of current input / output terminals is configured to be able to connect a terminal of a coaxial cable. The other of the terminals is configured so that a terminal of a non-coaxial cable can be connected.

  The resistor according to claim 1 includes: a third current input / output terminal disposed in a first region of the support body where one end of the resistor is located; and a support body where the other end of the resistor is located. A fourth current input / output terminal disposed in the second region, a first current line, a second wiring, and a third current input are disposed on the support along the current path constituted by the resistor. And a third wiring for connecting the output terminal and the fourth current input / output terminal. For this reason, according to this resistor, as a result of allowing the measurement current to flow through the third wiring in the direction opposite to the direction of the current flowing through the current path (measurement current), the measurement current flowing through the current path The generated magnetic field and the magnetic field generated by the measurement current flowing through the third wiring are canceled out, and the influence of the voltage induced by the magnetic field on the voltage between the voltage detection terminals can be suppressed to a low level. Therefore, according to this resistor, for example, when the calibration is performed using the resistor, the resistance value as the measurement target can be accurately measured, so that the calibration accuracy can be sufficiently improved. . Moreover, according to this resistor, since the structure is simple, manufacturing efficiency can be sufficiently improved.

  The resistor according to claim 2 includes a pair of first to fourth current input / output terminals, and one of the pair of current input / output terminals can be connected to a terminal of a coaxial cable. The other of the pair of current input / output terminals is configured so that a terminal of a non-coaxial cable can be connected. Therefore, according to this resistor, for example, when performing measurement using a measurement current with a small current value, the terminal of the coaxial cable is connected to one of the pair of current input / output terminals. When measuring with a large current value, connect the non-coaxial cable terminal to the other of each pair of current input / output terminals. As a result of being able to supply an electric current, it can respond to various usage forms.

1 is a perspective view of a resistor 1. FIG. 1 is a configuration diagram conceptually showing the configuration of a resistor 1. FIG. 3 is a first explanatory diagram explaining how to use the resistor 1. FIG. 6 is a second explanatory diagram explaining how to use the resistor 1. It is a block diagram which shows the structure of the resistor 1a.

  Hereinafter, an embodiment of a resistor will be described with reference to the accompanying drawings.

  First, the configuration of the resistor 1 shown in FIG. 1 as an example of the resistor will be described with reference to the drawings. The resistor 1 is, for example, a resistor used for calibration of a resistance measuring device, and as shown in FIG. 2 and FIG. 2, the substrate 11, the resistor 12, the current terminal C1, the current terminal C2, and the voltage terminal P1. , Voltage terminal P2, current terminal C3, current terminal C4, wiring W1, wiring W2, and wiring W3.

  The board | substrate 11 is an example of a support body, and as shown in FIG. 1, it is formed in the rectangular plate shape. Further, as schematically shown in FIG. 2, the substrate 11 has three conductor patterns 31a, 31b, and 31c formed therein. In this case, as shown in the figure, the conductor patterns 31a and 31b are arranged on the upper surface 21 side of the substrate 11 so as to extend along the length direction of the substrate 11 while being separated from each other. Further, the conductor pattern 31c is spaced apart from the conductor patterns 31a and 31b in the thickness direction and faces the conductor patterns 31a and 31b and extends along the length direction of the substrate 11 in the middle portion of the substrate 11 in the thickness direction. Are arranged to be. As shown in the figure, the substrate 11 includes vias 32a and 32b connected to the conductor pattern 31a, vias 32c and 32d connected to the conductor pattern 31b, and vias 32e and 32f connected to the conductor pattern 31c. Is formed. In this case, one end of each of the vias 32a to 32f is exposed on the upper surface 21.

  As shown in the figure, the resistor 12 is disposed in the central portion on the upper surface 21 side of the substrate 11.

  The current terminal C1 inputs / outputs a measurement current (hereinafter also referred to as “measurement current Im”) that flows through the wiring W1, the resistor 12, and the wiring W2 when measurement is performed using the resistor 1 (to be described later). This corresponds to the first current input / output terminal to which the current terminal 52a of the resistance measuring device 50 and the current terminal 72a (see FIGS. 3 and 4) of the resistance measuring device 70 are connected. In this case, as shown in FIGS. 1 and 2, the current terminal C <b> 1 is disposed in the first region 11 a (the left region in both drawings) where the one end 12 a of the resistor 12 is located on the upper surface 21 of the substrate 11. Yes. Further, as shown in FIG. 2, the current terminal C1 is connected to one end 12a of the resistor 12 via the wiring W1.

  The current terminal C2 inputs / outputs a measurement current Im flowing through the wiring W1, the resistor 12, and the wiring W2 when performing measurement or the like (a current terminal 52b of the resistance measuring device 50 described later or a short-circuit member 80 (FIGS. 3 and 4). Corresponds to a second current input / output terminal. In this case, as shown in FIGS. 1 and 2, the current terminal C <b> 2 is disposed in the second region 11 b (the right region in both drawings) where the other end portion 12 b of the resistor 12 is located on the upper surface 21 of the substrate 11. ing. Further, as shown in FIG. 2, the current terminal C2 is connected to the other end portion 12b of the resistor 12 via the wiring W2.

  The voltage terminal P1 and the voltage terminal P2 detect voltages at both ends of the resistor 12 when performing measurement or the like (voltage terminals 54a and 54b of the resistance measuring device 50 and voltage terminals 74a and 74b of the resistance measuring device 70 described later). 3) corresponds to a voltage detection terminal. In this case, as shown in FIG. 2, the voltage terminal P <b> 1 is disposed in the first region 11 a on the upper surface 21 of the substrate 11 and is connected to the one end 12 a of the resistor 12. Further, the voltage terminal P <b> 2 is disposed in the second region 11 b on the upper surface 21 of the substrate 11 and is connected to the other end portion 12 b of the resistor 12, as shown in FIG.

  The current terminal C3 inputs / outputs the measurement current Im to flow the measurement current Im through the wiring W3 in the direction opposite to the direction of the measurement current Im flowing through the wiring W1, the resistor 12 and the wiring W2 (described later). This corresponds to a third current input / output terminal to which the current terminal 52c of the resistance measuring device 50 and the current terminal 72b (see FIGS. 3 and 4) of the resistance measuring device 70 are connected. In this case, the current terminal C3 is disposed in the first region 11a (in the vicinity of the current terminal C1) on the upper surface 21 of the substrate 11, as shown in FIGS.

  In the same manner as the current terminal C3, the current terminal C4 inputs and outputs the measurement current Im in order to flow the measurement current Im through the wiring W3 (a current terminal 52d of the resistance measuring device 50 described later and a short-circuit member 80 (FIG. 3). , 4) is connected, and is arranged in the second region 11b (near the current terminal C2) on the upper surface 21 of the substrate 11, as shown in FIGS. ing. As shown in FIG. 2, the current terminal C3 and the current terminal C4 are connected to each other by a wiring W3.

  As shown in FIG. 2, the wiring W <b> 1 is a wiring that connects the current terminal C <b> 1 and one end portion 12 a of the resistor 12, and includes a conductor pattern 31 a and a via 32 a formed on the substrate 11. As shown in the figure, the wiring W2 is a wiring that connects the current terminal C2 and the other end portion 12b of the resistor 12, and includes a conductor pattern 31b and a via 32c formed on the substrate 11. .

  As shown in FIG. 2, the wiring W3 is a wiring for connecting the current terminal C3 and the current terminal C4, and is composed of the conductor pattern 31c and the vias 32e and 32f formed on the substrate 11, and the wiring described above. It is arranged in the substrate 11 along a current path Cc (path indicated by a broken line in the figure) constituted by W1, the wiring W2, and the resistor 12.

  Next, the usage method of the resistor 1 is demonstrated with reference to drawings.

  For example, the resistor 1 is used as a standard resistor when the resistance measuring apparatus is calibrated. First, an example of calibrating a resistance measuring device (for example, the resistance measuring device 50 shown in FIG. 3) corresponding to the four-terminal pair method using the resistor 1 as a standard resistor will be described. In this case, the resistance measuring device 50 includes coaxial cables 51a and 51b, current terminals 52a to 52d, cables 53a and 53b, voltage terminals 54a and 54b, a power supply unit 55, an ammeter 56, and a voltmeter 57, as shown in FIG. And a measurement unit (not shown). The current terminals 52a and 52b are connected to the core wires 61a and 61b of the coaxial cables 51a and 51b, respectively. The current terminals 52c and 52d are connected to the shields 62a and 62b of the coaxial cables 51a and 51b, respectively. The voltage terminals 54a and 54b are connected to cables 53a and 53b, respectively.

  First, as shown in FIG. 3, the current terminals 52a and 52b of the resistance measuring device 50 are connected to the current terminals C1 and C2 of the resistor 1, respectively, and the current terminals 52c and 52d of the resistance measuring device 50 are connected to the current of the resistor 1. Connect to terminals C3 and C4, respectively. Next, the voltage terminals 54a and 54b of the resistance measuring device 50 are connected to the voltage terminals P1 and P2 of the resistor 1, respectively.

  Subsequently, the power source 55 outputs a measurement current Im (for example, an alternating current). At this time, as shown in FIG. 3, the measurement current Im flows through a current path indicated by a one-dot chain line in FIG. Specifically, the measurement current Im is input to the current terminal C1 of the resistor 1 through the core wire 61a of the coaxial cable 51a and the current terminal 52a in the resistance measuring device 50, and the wiring W1, the resistor 12 and the wiring It flows through W2 (the above-described current path Cc). The measurement current Im flowing through the current path Cc is output from the current terminal C2, and is input to the ammeter 56 through the current terminal 52b of the resistance measuring device 50 and the core wire 61b of the coaxial cable 51b. At this time, the ammeter 56 detects the current value of the measurement current Im.

  Next, as shown in FIG. 3, the measurement current Im is input to the current terminal C4 of the resistor 1 through the shield 62b of the coaxial cable 51b and the current terminal 52d in the resistance measuring device 50, and flows through the wiring W3. . In this case, the direction of the measurement current Im flowing through the current path Cc is opposite to the direction of the measurement current Im flowing through the wiring W3.

  Subsequently, the measurement current Im flowing through the wiring W3 is output from the current terminal C3, and returns to the power supply unit 55 through the current terminal 52c of the resistance measuring device 50 and the shield 62a of the coaxial cable 51a.

  On the other hand, the voltmeter 57 of the resistance measuring device 50 detects the voltage value between the voltage terminal P1 and the voltage terminal P2 in the resistor 1 via the voltage terminals 54a and 54b and the cables 53a and 53b. Next, a measurement unit (not shown) in the resistance measurement device 50 measures the resistance value based on the current value of the measurement current Im detected by the ammeter 56 and the voltage value detected by the voltmeter 57. In this case, the measured resistance value becomes the calibration value.

  Here, since the resistor 1 includes the current terminal C3, the current terminal C4, and the wiring W3 connecting the both terminals C3 and C4, the current terminals 52a to 52d are connected to the current terminals C1 to C4 as described above. By connecting, the measurement current Im can be supplied to the wiring W3 in the direction opposite to the direction of the measurement current Im flowing through the current path Cc constituted by the wiring W1, the resistor 12, and the wiring W2. Therefore, in this resistor 1, the magnetic field generated by the measurement current Im flowing through the current path Cc and the magnetic field generated by the measurement current Im flowing through the wiring W3 are canceled out, and the voltage between the voltage terminals P1 and P2 is reduced. The influence of the voltage induced by the magnetic field can be kept low. Therefore, since the resistance value can be accurately measured by performing calibration using the resistor 1, it is possible to sufficiently improve the calibration accuracy.

  Next, an example of calibrating a resistance measuring device (for example, the resistance measuring device 70 shown in FIG. 4) corresponding to the four-terminal method using the resistor 1 as a standard resistor will be described. In this case, as shown in the figure, the resistance measuring device 70 includes cables 71a and 71b, current terminals 72a and 72b, cables 73a and 73b, voltage terminals 74a and 74b, a power supply unit 75, an ammeter 76, a voltmeter 77, And a measurement unit (not shown). The current terminals 72a and 72b are connected to the cables 71a and 71b, respectively, and the voltage terminals 74a and 74b are connected to the cables 73a and 73b, respectively.

  First, as shown in FIG. 4, the current terminal C2 and the current terminal C4 of the resistor 1 are short-circuited by a short-circuit member 80 (a member having conductivity). Subsequently, the current terminals 72a and 72b of the resistance measuring device 70 are connected to the current terminals C1 and C3 of the resistor 1, respectively. Next, the voltage terminals 74a and 74b of the resistance measuring device 70 are connected to the voltage terminals P1 and P2 of the resistor 1, respectively.

  Subsequently, the power supply unit 75 outputs the measurement current Im. At this time, as shown in FIG. 4, the measurement current Im flows through a current path indicated by a one-dot chain line in FIG. Specifically, the measurement current Im is input to the current terminal C1 of the resistor 1 through the cable 71a and the current terminal 72a in the resistance measuring device 70, and the wiring W1, the resistor 12, and the wiring W2 (current path) Flow through Cc). Further, the measurement current Im flowing through the current path Cc is output from the current terminal C2, is input to the current terminal C4 through the short-circuit member 80, and flows through the wiring W3. In this case, the direction of the measurement current Im flowing through the current path Cc is opposite to the direction of the measurement current Im flowing through the wiring W3. Next, the measurement current Im is output from the current terminal C <b> 3, returns to the power supply unit 55 through the current terminal 72 b of the resistance measurement device 70, the cable 71 b, and the ammeter 76. At this time, the ammeter 76 detects the current value of the measurement current Im.

  On the other hand, the voltmeter 77 of the resistance measuring device 70 detects the voltage value between the voltage terminal P1 and the voltage terminal P2 in the resistor 1 via the voltage terminals 74a and 74b and the cables 73a and 73b. Subsequently, a measurement unit (not shown) in the resistance measurement device 70 measures the resistance value based on the current value of the measurement current Im detected by the ammeter 76 and the voltage value detected by the voltmeter 77. In this case, the measured resistance value becomes the calibration value.

  Also in this usage example, as described above, the current terminal C2 and the current terminal C4 of the resistor 1 are short-circuited by the short-circuit member 80, and the current terminals 72a and 72b are connected to the current terminals C1 and C3, respectively. Since the measurement current Im can flow through the wiring W3 in the direction opposite to the direction of the measurement current Im flowing through the path Cc, the influence of the voltage induced by the magnetic field on the voltage between the voltage terminals P1 and P2 is reduced. It is possible to suppress. Therefore, also in this use example, since the resistance value can be measured accurately, it is possible to sufficiently improve the accuracy of calibration.

  Further, in this use example (use example of the resistance measuring device 70 corresponding to the four-terminal method), as shown in FIG. 4, the measurement current Im is input via the current terminals C1 and C3 arranged in close proximity. Since the output can be performed, the cables 71a and 71b supplying the measurement current Im can be brought close to each other. As a result, the magnetic fields generated from the cables 71a and 71b are canceled out, and the influence of the magnetic fields can be kept low. . Further, by bringing the cables 71a and 71b close to each other, the area of the loop surrounded by the current path (the hatched portion in the figure) can be reduced, so that the generation of a magnetic field from the current path can be reduced. In addition, in the case where a magnetic field is generated in the surroundings, the magnetic field passing through the loop can be suppressed to a low level. As a result, the influence of these magnetic fields can be suppressed to a low level.

  As described above, the resistor 1 includes the current terminal C3 disposed in the first region 11a of the substrate 11 where the one end 12a of the resistor 12 is located, and the substrate 11 where the other end 12b of the resistor 12 is located. The current terminal C4 disposed in the second region 11b, the wiring disposed on the substrate 11 along the current path Cc formed by the wirings W1 and W2 and the resistor 12, and connecting the current terminals C3 and C4 W3. For this reason, according to the resistor 1, the measurement current Im can flow through the wiring W3 in the direction opposite to the direction of the measurement current Im flowing through the current path Cc. As a result, the measurement current flowing through the current path Cc. The magnetic field generated by Im and the magnetic field generated by the measurement current Im flowing through the wiring W3 are canceled out, and the influence of the voltage induced by the magnetic field on the voltage between the voltage terminals P1 and P2 can be suppressed low. Therefore, according to the resistor 1, for example, when the calibration is performed using the resistor 1, the resistance value as the amount to be measured can be accurately measured, so that the calibration accuracy can be sufficiently improved. Can do. Moreover, according to this resistor 1, since structure is simple, manufacturing efficiency can fully be improved.

  In addition, the structure of a resistor is not limited to said structure. For example, although an example in which only one current terminal C1 to C4 is provided has been described above, a configuration in which a plurality of current terminals C1 to C4 are provided may be employed. As an example, as shown in FIG. 5, a pair of current terminals C1a and C1b as first current input / output terminals, a pair of current terminals C2a and C2b as second current input / output terminals, and a third current The resistor 1a including a pair of current terminals C3a and C3b as input / output terminals and a pair of current terminals C4a and C4b as fourth current input / output terminals can be employed. In this resistor 1a, either one of each pair of current terminals (for example, current terminals C1a, C2a, C3a, C4a) can be connected to a terminal (for example, BNC terminal) of a coaxial cable, The other of each pair of current terminals (for example, current terminals C1b, C2b, C3b, and C4b) is configured to be connectable to a terminal (for example, a banana terminal) of a non-coaxial cable.

  With this configuration, the coaxial cable terminal is connected to one terminal (current terminals C1a, C2a, C3a, C4a) when performing measurement using the measurement current Im having a small current value. When the measurement current Im is supplied and measurement is performed using the measurement current Im having a large current value, the terminal of the non-coaxial cable is connected to the other terminal (current terminals C1b, C2b, C3b, C4b). As a result of being connected and supplying the measurement current Im, it is possible to cope with various usage forms.

  Moreover, although the example which uses the conductor patterns 31a-31c formed in the board | substrate 11 as 1st wiring W1-W3 was mentioned above, for example, the upper surface 21 and the lower surface of the board | substrate 11 in which the conductor patterns 31a-31c are not formed are used. It is also possible to employ a configuration in which conductive wires functioning as one wiring W1 to W3 are disposed.

  Further, the example of using the resistor 1 when calibrating the resistance measuring apparatus has been described above. However, the application of the resistor 1 is not limited to this, and for example, a shunt resistor for measuring a current as a measured amount. Can also be used.

DESCRIPTION OF SYMBOLS 1,1a Resistor 11 Board | substrate 11a 1st area | region 11b 2nd area | region 12 Resistor 12a One end part 12b Other end part 31a-31c Conductor pattern 32a-32f Via C1, C1a, C1b Current terminal C2, C2a, C2b Current terminal C3 C3a, C3b Current terminal C4, C4a, C4b Current terminal Cc Current path P1 Voltage terminal P2 Voltage terminal W1-W3 Wiring

Claims (2)

A support, a resistor disposed on the support, and a first wire disposed on the support, connected to one end of the resistor and having the one end positioned Connected to the other end of the resistor via the first current input / output terminal disposed in the first region and the second wiring disposed on the support, the other end of the support A resistor having a second current input / output terminal disposed in the second region where the section is located, and a pair of voltage detection terminals respectively connected to the one end and the other end of the resistor A vessel,
A third current input / output terminal disposed in the first region; a fourth current input / output terminal disposed in the second region; the first wire; the second wire; and the resistor. A resistor provided on the support along a current path constituted by a body and having a third wiring for connecting the third current input / output terminal and the fourth current input / output terminal . A pair of the first current input / output terminal, the second current input / output terminal, the third current input / output terminal, and the fourth current input / output terminal;
Either one of the pair of current input / output terminals can be connected to a coaxial cable terminal, and the other of the pair of current input / output terminals can be connected to a non-coaxial cable terminal. The resistor according to claim 1, which is configured.

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