Heat generation detection device

Abstract

A heat generation detection device (10) is provided with a short-circuit position detection device (12) that detects a short-circuit portion (BW) of a first lead wire (B) and a second lead wire (W). A short-circuit position detection device (12) is provided with a switch (S) having at least one opening / closing contact (S1, S2). The switch (S) is configured so as to form at least three different two-terminal circuits (9) by switching the connection modes of a first branch (A1) having a first resistance value (R1), a second branch (A2) having a second resistance value (R2), and a third branch (A3) having a third resistance value (R3) so that the first branch (A1), the second branch (A2), and the third branch (A3) are included in the at least one two-terminal circuit (9).

Description

Technical Field

[0001] The present invention relates to a fever detection device that detects the heating of a detection object by detecting the following situation: a first conductor and a second conductor arranged along the detection object in a state of being adjacent to each other with an insulator softened at a preset temperature sandwiched therebetween become short-circuited due to softening of the insulator caused by heat. Background Art

[0002] In the case where the heating of the detection object is detected by the fact that the first conductor and the second conductor have become short-circuited as described above, if the recovery of the detection object is taken into consideration, it is preferable to also determine the part that has become short-circuited. In Japanese Patent Publication No. 10-20334, a technology for determining the part that has become short-circuited is disclosed. Specifically, a probe is connected to the end of one side of the first conductor and the second conductor, and the resistance value "r0" from one end of the first conductor to one end of the second conductor via the short-circuited part is measured. If the resistance value between one end of the first conductor and the short-circuited part is set to "R1", the resistance value between the first conductor and the second conductor at the short-circuited part is set to "r", and the resistance value between one end of the second conductor and the short-circuited part is set to "R2", the measured resistance value becomes "R1+r+R2". Here, the line length between one end of the first conductor and the short-circuited part and the line length between one end of the second conductor and the short-circuited part are approximately equal, so it can be regarded as "R1=R2". Furthermore, in this document, the resistance value "r" at the short-circuit portion is considered to be sufficiently small compared to "R1" and "R2" and is regarded as zero, and is approximated as "r0 = 2·R1". The line length "L0" of the first conductor and the second conductor and the resistance value "R0" of the entire line are known, so the length "x" from one end of the first conductor (the same is true for one end of the second conductor) to the short-circuit portion is "x = (R1 / R0)·L0". Summary of the invention

[0003] However, when the first conductor and the second conductor are in a "short-circuited state", various states can be considered in terms of the contact between the first conductor and the second conductor at the short-circuited portion, and various values ​​can be considered for the resistance value. For example, when the softening of the insulator between the first conductor and the second conductor is stable, it can be considered that the first conductor and the second conductor are in a "short-circuited state" with a relatively large resistance value. In such a case, it is also preferable to be able to quickly detect the heating of the detection object and accurately determine the short-circuited portion as the heating portion. However, when the resistance value between the first conductor and the second conductor at the short-circuited portion is considered to be zero as described above, the error generated in the estimated short-circuited portion becomes large.

[0004] In view of the above background, it is desirable to provide a technology for accurately identifying a short-circuited portion by also referring to the resistance value between the first conductive wire and the second conductive wire at the short-circuited portion.

[0005] In view of the fact that the above-mentioned fever detection device is a fever detection device comprising the following components: a first conductor having a first contact and a second contact at both ends, respectively; and a second conductor having a third contact and a fourth contact at both ends, respectively, the fever detection device detects the following situation and detects the fever of the detection object: the first conductor and the second conductor, which are arranged along the detection object in a state of being adjacent to each other with an insulator softened at a preset temperature sandwiched therebetween, have become short-circuited due to the softening of the insulator caused by heat, and the above-mentioned fever detection device comprises a short-circuit position detection device for detecting the short-circuit position of the first conductor and the second conductor, and the above-mentioned short-circuit position detection device comprises: a first object contact selected from at least one of the second contact, the third contact, and the fourth contact; a second object contact selected from at least one of the first contact, the second contact, the third contact, and the fourth contact except the first object contact; a reference resistor connected to at least one of the positive electrode and the negative electrode; a first reference contact, which is a contact connected to the positive electrode or a contact connected to the positive electrode via the reference resistor; a second reference contact, which is a contact connected to the negative electrode or a contact connected to the negative electrode via the reference resistor; a voltage detector, which detects an object voltage as a voltage between the first object contact and the second object contact;and a switch having at least one opening and closing contact, wherein the switch is a switch that switches at least the electrical connection between each of the first contact, the second contact, the third contact, and the fourth contact and each of the first reference contact and the second reference contact, thereby switching the circuit structure of a two-terminal circuit having the first object contact and the second object contact as terminals, and when the first conductor and the second conductor are in a short-circuited state at the short-circuited portion, the contact of the first conductor at the short-circuited portion is used as a first short-circuited point, the contact of the second conductor at the short-circuited portion is used as a second short-circuited point, the branch from the first contact to the first short-circuited point and the branch from the third contact to the second short-circuited point are used as the first branch, and the branch from the first contact to the first short-circuited point and the branch from the third contact to the second short-circuited point are used as the first branch. The branch from the contact point to the second short-circuit point is a branch having a first resistance value that can be regarded as the same value as each other, the branch from the first short-circuit point to the second contact point and the branch from the second short-circuit point to the fourth contact point are the second branches, the branch from the first short-circuit point to the second contact point and the branch from the second short-circuit point to the fourth contact point are the branches having a second resistance value that can be regarded as the same resistance value as each other, the branch formed between the first short-circuit point and the second short-circuit point and having a third resistance value is the third branch, and the switch is configured in such a way that the connection mode of the first branch, the second branch and the third branch is switched so that the first branch, the second branch and the third branch are included in at least one of the two-terminal circuits, thereby forming at least three different two-terminal circuits. ;

[0006] According to this structure, the connection state of the first wire and the second wire with the first reference contact on the positive side and the second reference contact on the negative side can be switched by a switch, thereby making at least three two-terminal circuits. In each two-terminal circuit, at least one of the unknown first resistance value, the second resistance value, and the third resistance value is included, so that the three unknown resistance values ​​can be obtained by the simultaneous equations based on the three different two-terminal circuits. By determining the third resistance value that can take various values ​​according to the short-circuit mode at the short-circuit position, the values ​​of the first resistance value and the second resistance value can also be determined with good accuracy. The resistance value of the wire has a linear relationship with the length of the wire, so by determining the first resistance value and the second resistance value as the resistance value of the wire, the short-circuit position can be estimated with good accuracy. That is, according to this structure, the short-circuit position can also be determined with good accuracy by referring to the resistance value between the first wire and the second wire at the short-circuit position.

[0007] Further features and advantages of the fever detection device will become apparent from the following description of exemplary and non-limiting embodiments described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a front view showing an example of an article transport vehicle. Figure 2 1 is a circuit block diagram schematically showing a configuration example of a short circuit detection device in a fever detection device. Figure 3 This is an equivalent circuit of the heat-sensitive wire when a short circuit occurs in the heat-sensitive wire. Figure 4 is shown by Figure 5 and Figure 6 This is a circuit block diagram of a first example of a two-terminal circuit formed by selection of the same switch. Figure 5 is shown by Figure 4 and Figure 6 A circuit block diagram of a second example of a two-terminal circuit formed by selection of the same switch. Figure 6 is shown by Figure 4 and Figure 5 This is a circuit block diagram of a third example of a two-terminal circuit formed by selecting the same switch. Figure 7 is shown by Figures 4 to 6 A diagram showing examples of three different types of two-terminal circuits and combined resistances formed by selection of switches of different configurations. Figure 8 is shown by Figures 4 to 7 A diagram showing examples of three different types of two-terminal circuits and combined resistances formed by selection of switches of different configurations. Fig. 9 It shows that it has the ability to constitute Figures 10 to 12 An equivalent circuit of an example of a circuit of a switch of a two-terminal circuit is shown. Fig.10 This is a diagram showing a two-terminal pair circuit (four-terminal circuit) which is a basis for forming a two-terminal circuit by switching the connection method of the first branch, the second branch, and the third branch. Fig.11 The diagrams show a plurality of examples of two-terminal circuits in the case where only one contact among the first contact, the second contact, the third contact, and the fourth contact is selectively connected to the first target contact of the detection target voltage. Fig.12 The diagrams show a plurality of examples of two-terminal circuits in a case where two contacts are selectively connected to a first target contact for detecting a target voltage among the first contact, the second contact, the third contact, and the fourth contact. Fig.13The diagrams show a plurality of examples of two-terminal circuits in the case where three contacts are selectively connected to a first target contact for detecting a target voltage among a first contact, a second contact, a third contact, and a fourth contact. DETAILED DESCRIPTION

[0009] Hereinafter, an embodiment of the fever detection device will be described with reference to the accompanying drawings. For example, the fever detection device is used in an article transport facility 100 having an article transport vehicle 50. Figure 1 As shown, the article transport facility 100 includes: a power supply line 8 arranged along a travel track 52 forming a moving path 51 of the article transport vehicle 50 , and supplying power to the article transport vehicle 50 in a non-contact manner; and a heat-sensitive wire 3 arranged along the power supply line 8 .

[0010] The article transport vehicle 50 illustrated in the present embodiment comprises: a travel portion 59, which is guided by a pair of travel rails 52 and travels along a moving path 51, and the pair of travel rails 52 are arranged to be suspended and supported by the ceiling; a transport vehicle body 53, which is located below the travel rails 52 and is suspended and supported on the travel portion 59; and a power receiving device 40, which receives driving power from a power supply line 8 arranged along the moving path 51 in a non-contact manner. The transport vehicle body 53 is provided with an article support portion (not shown), which is freely raised and lowered and is provided on the transport vehicle body 53, and supports the article in a suspended state. The article to be transported by the article transport vehicle 50 is, for example, a FOUP (Front Opening Unified Pod) for storing semiconductor substrates or a glass substrate that becomes a material for a display.

[0011] The travel section 59 is provided with a pair of travel wheels 55 that are rotationally driven by an electric drive motor 54. The travel wheels 55 roll on a travel surface formed by the upper surfaces of the respective travel rails 52. The travel section 59 is provided with a travel drive motor 54 or a drive circuit thereof, and the article transport vehicle 50 travels along the travel rails 52. The transport vehicle body 53 is provided with an actuator that raises and lowers an article support portion, an actuator that drives a gripping portion that grips an article, and their drive circuits.

[0012] The power supplied to the drive motor 54 or various actuators, the drive circuits driving them, etc., is supplied in a non-contact manner from the power supply line 8 to the power receiving device 40. In the present embodiment, the power supply line 8 for supplying the driving power to the article transport vehicle 50 via the power receiving device 40 is arranged on both sides of the power receiving device 40 along the horizontal plane and in the path width direction orthogonal to the moving path 51.

[0013] In this embodiment, the power receiving device 40 uses wireless power supply technology to receive power from the power supply line 8 and supply driving power to the article transport vehicle 50. A high-frequency current flows through the power supply line 8 as an induction line, generating a magnetic field around the power supply line 8. The power receiving device 40 is configured with a pickup coil (not shown) or a magnetic core (not shown), and the pickup coil induces power through electromagnetic induction from the magnetic field. The induced AC power is converted into DC by a rectifier circuit such as a full-wave rectifier circuit or a power receiving circuit (not shown) having a smoothing capacitor, etc., and is supplied to an actuator or a drive circuit.

[0014] like Figure 1 As shown, the heat-sensitive wire 3 includes a pair of conductors 1 (a first conductor B and a second conductor W) covered by an insulator 2 softened at a preset temperature. One conductor 1 is configured as a coated conductor wire in which a core wire 1c formed of a conductor is covered by an insulator 2. Furthermore, the two conductors 1, the first conductor B and the second conductor W, are twisted to form a so-called twisted pair, and are further covered with a coating material 3d, thereby forming a heat-sensitive wire 3 including a pair of conductors 1. In addition, the first conductor B and the second conductor W are the same components manufactured according to the same specifications, and the resistance value per unit length is also equal except for errors such as individual differences. In addition, the total length of the first conductor B and the second conductor W in the heat-sensitive wire 3 is also the same except for errors.

[0015] like Figure 2 As shown, the first wire B has a first contact B1 and a second contact B2 at both ends, and the second wire W has a third contact W1 and a fourth contact W2 at both ends. One end of the first wire B (the first contact B1) and one end of the second wire W (the third contact W1) at one end of the heat-sensitive wire 3 are connected to the positive side (Vp) and the negative side (the earth) of the short-circuit detection device 11, respectively. In addition, the other end of the first wire B (the second contact B2) and the other end of the second wire W (the fourth contact W2) at the other end of the heat-sensitive wire 3 are connected to each other via the relay 6 described later. In addition, Figure 2 The "Rr" in the figure is a current limiting resistor (limiting resistor) that limits the current flowing between the positive and negative electrodes. That is, the heat-sensitive wire 3 is connected between the positive electrode (Vp) and the negative electrode (earth) in the order of the positive electrode (Vp), the current limiting resistor Rr, the first wire B, the relay 6, the second wire W, and the earth.

[0016] The pair of conductors 1 formed as twisted wires is configured in such a manner that if the insulator 2 softens, the core wires 1c formed of the conductors come into contact with each other and short-circuit. In addition, the coating material 3d is formed of a material that does not soften even at a temperature at which the insulator 2 softens. Therefore, even if the insulator 2 softens, the heat-sensing wire 3 having the pair of conductors 1 is coated with the coating material 3d, thereby preventing the core wire 1c from being exposed to the outside. The power supply line 8 also includes a power supply line main body 8c (core wire) formed of a conductor and a coating 8d formed of an insulator and covering the power supply line main body 8c.

[0017] The heat-sensitive wire 3 is arranged along the power supply line 8 near the power supply line 8, and preferably the heat-sensitive wire 3 is arranged along the power supply line 8 in a state of being in close contact with the power supply line 8. If the temperature of the power supply line 8 rises, the insulator 2 softens as described above, and the core wires 1c contact each other in an uninsulated state, resulting in a short-circuit state. In addition, the so-called "short-circuit state" is not limited to a state in which the resistance between the core wires 1c of the first conductor B and the second conductor W is zero, but an extremely low state (a state in which the resistance value is less than a predetermined value). The short-circuit detection device 11 can detect an abnormality of the power supply line 8 (in this case, a temperature rise) by detecting that the heat-sensitive wire 3 has become a short-circuit state when it is energized (= a short circuit has been generated).

[0018] In this embodiment, the short circuit detection device 11 is installed, for example, on a Figures 4 to 9 The short-circuit position detection device 12 is also mounted on the same substrate as described above. A control device 7 is also mounted on the substrate, or the control device 7 is connected to the substrate. The control device 7 has a part of the functions of the short-circuit detection device 11 and a part of the functions of the short-circuit position detection device 12. It is appropriate that the control device 7 is constructed with a microcomputer as the core. Of course, the short-circuit detection device 11 and the short-circuit position detection device 12 can also be mounted on different substrates, and the short-circuit detection device 11 and the short-circuit position detection device 12 can also be connected to different control devices 7. In short, it is appropriate that the wiring of the first wire B and the second wire W can be switched accordingly when they are connected to the short-circuit detection device 11 and when they are connected to the short-circuit position detection device 12. For example, it can also be constructed in the following manner: after the short-circuit detection device 11 detects that the heat-sensitive wire 3 has become a short-circuit state, the short-circuit position detection device 12 is connected to the heat-sensitive wire 3 instead of the short-circuit detection device 11 to determine the part that has become a short-circuit state.

[0019] When the heat-sensitive wire 3 is energized and the heat-sensitive wire 3 is not in a short-circuited state, the current flows from the positive electrode (Vp) through the path of the current-limiting resistor Rr, the first wire B, the coil of the relay 6, the second wire W, and the earth. For example, in the case where the relay 6 is a contact type, if the current passes and the contacts of the relay 6 are closed, the two terminals of the control device 7 connected to the two ends of the contacts of the relay 6 become conductive. Here, if the heat-sensitive wire 3 becomes short-circuited, the current flows through the short-circuited portion. That is, the current flows from the positive electrode (Vp) through the path of the current-limiting resistor Rr, the first wire B, the short-circuited portion, the second wire W, and the earth, and does not flow through the relay 6. Therefore, if the contacts of the relay 6 are disconnected, the two terminals of the control device 7 connected to the two ends of the contacts of the relay 6 also become non-conductive.

[0020] Thus, the control device 7 can detect that the heat-sensitive wire 3 has become a short-circuited state, that is, the first wire B and the second wire W have become a short-circuited state. The relay 6 functions as a short-circuit detection unit. Moreover, the control device 7 or a control device different from the control device 7 (for example, a device control device of the article conveying device 100 or a control device of a power supply system that supplies power to the power supply line 8) can determine that heat is generated in the power supply line 8. That is, the heat detection device 10 detects the heat generation of the detection object (power supply line 8) by detecting the following situation: the first wire B and the second wire W arranged along the detection object (here, the power supply line 8) in a state of being adjacent to each other with the insulator 2 softened at a preset temperature sandwiched therebetween have become a short-circuited state due to the softening of the insulator 2 caused by heat.

[0021] If the heating of the power supply line 8 is detected by the fact that the first wire B and the second wire W have become short-circuited, the operation of the power supply system or the article conveying equipment 100 is temporarily stopped and recovery work is performed. Considering the lead time before recovery, it is preferable to also identify the part where the heat-sensitive wire 3 has become short-circuited, that is, the part where the power supply line 8 has heated up. Therefore, the heating detection device 10 is further provided with a short-circuit position detection device 12 (see Figures 4 to 9 wait).

[0022] Figure 3The equivalent circuit of the heat-sensitive wire 3 when a short circuit occurs in the heat-sensitive wire 3 is shown. When the first conductor B and the second conductor W are in a short-circuited state at the short-circuit location BW, the contact point of the first conductor B at the short-circuit location BW is referred to as the first short-circuit point B3, and the contact point of the second conductor W at the short-circuit location BW is referred to as the second short-circuit point W3. The first short-circuit point B3, the second short-circuit point W3, and the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 described above are contacts (nodes) in the equivalent circuit. In addition, the branch (or arm) from the first contact B1 to the first short-circuit point B3 and the branch from the third contact W1 to the second short-circuit point W3 are referred to as the first branch A1. As shown in FIG. Figure 3 As shown in the equivalent circuit of , the branch from the first contact B1 to the first short-circuit point B3 and the branch from the third contact W1 to the second short-circuit point W3 are branches having the first resistance value R1 which can be regarded as the same value, and are called "first branch A1" with the same name. In addition, the branch from the first short-circuit point B3 to the second contact B2 and the branch from the second short-circuit point W3 to the fourth contact W2 are called second branch A2. Figure 3 As shown in the equivalent circuit of , the branch from the first short-circuit point B3 to the second contact B2 and the branch from the second short-circuit point W3 to the fourth contact W2 are branches having the second resistance value R2 which can be regarded as the same value, and are called "second branch A2" with the same name. In addition, the branch formed between the first short-circuit point B3 and the second short-circuit point W3 and having the third resistance value R3 is called the third branch A3.

[0023] Here, for example, the following resistance values ​​are measured: the resistance value (R1+R3+R1) between the end of one side of the first wire B (the first contact B1) and the end of one side of the second wire W (the third contact W1); and the resistance value (R1+R3+R2) between the end of one side of the first wire B (the first contact B1) and the end of the other side of the second wire W (the fourth contact W2). If the third resistance value R3, which is the resistance value at the short-circuit portion BW, is regarded as zero, the resistance value between the first contact B1 and the third contact W1 becomes "R1+R1", and the resistance value between the first contact B1 and the fourth contact W2 becomes "R1+R2". Therefore, the "first resistance value R1" can be obtained from the resistance value between the first contact B1 and the third contact W1, and the "second resistance value R2" can be obtained from the first resistance value R1 and the resistance value between the first contact B1 and the fourth contact W2.

[0024] The overall resistance value of the first wire B (the resistance value between the first contact B1 and the second contact B2) and the overall resistance value of the second wire W (the resistance value between the third contact W1 and the fourth contact W2) can be considered equal, and the resistance value is known and is "R1+R2". In addition, the length and resistance value of the wire 1 have a linear relationship, so the first short-circuit point B3 and the second short-circuit point W3 can be estimated based on the ratio of the first resistance value R1 to the second resistance value R2, and the short-circuit location BW can be determined.

[0025] However, when the first wire B and the second wire W are in a "short-circuited state", various states can be considered in terms of the contact between the first wire B and the second wire W at the short-circuited portion BW, and various values ​​can be considered for the resistance value. For example, when the softening of the insulator 2 between the first wire B and the second wire W is stable, it can be considered that the first wire B and the second wire W are in a "short-circuited state" with a relatively large resistance value. In such a case, it is also preferable to be able to quickly detect the heating of the power supply line 8 and accurately determine the short-circuited portion BW as the heating portion. However, when the third resistance value R3 as the resistance value between the first wire B and the second wire W at the short-circuited portion is regarded as zero as described above, the error generated in the estimated short-circuited portion becomes large. The heating detection device 10 of the present embodiment is configured to include a short-circuited position detection device 12, and the short-circuited position detection device 12 also refers to the third resistance value R3 as the resistance value between the first wire B and the second wire W at the short-circuited portion BW, and can accurately determine the short-circuited portion BW.

[0026] For example, in the article transport device 100 and the like illustrated in the present embodiment, there is a tendency that the total length of the first wire B and the second wire W becomes longer. In addition, when the article transport vehicle 50 is a ceiling transport vehicle, as described above with reference to Figure 1 As described above, the power supply line 8 or the heat-sensitive line 3 is also arranged at a high position relative to the floor. That is, the first wire B and the second wire W are also often installed in a place where they cannot be easily seen. Therefore, in a case such as the article conveying equipment 100 illustrated in this embodiment, it is very useful to have a short-circuit position detection device 12 to identify the part where the heat-sensitive line 3 has become short-circuited (that is, the part where the temperature of the power supply line 8 has become high).

[0027] In this embodiment, for such reasons, the heat detection device 10 is exemplified as detecting the power supply line 8 in the article transport facility 100. However, the heat detection target is not limited to the power supply line 8. Of course, the equipment or device including the heat detection device 10 is not limited to the article transport facility 100.

[0028] Below, also refer to Figures 4 to 6 To illustrate. Figure 3 The equivalent circuit shown in Figure 4 The short-circuit position detection device 12 includes a first target contact t1, a second target contact t2, a first reference contact Q1, and a second reference contact Q2. In addition to the first target contact t1, the second target contact t2, the first reference contact Q1, and the second reference contact Q2, the short-circuit position detection device 12 also includes a voltage detector 5 and a switch S.

[0029] The first target contact t1 is at least one contact selected from the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2. The second target contact t2 is at least one contact selected from the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 except the first target contact t1.

[0030] The reference resistor Rref is a resistor connected to at least one of the positive electrode P (reference voltage Vref) and the negative electrode N (ground) of the short-circuit position detection device 12. Figure 4 etc., the example shows a method in which a reference resistor Rref is connected to the positive electrode P, but a reference resistor Rref may also be connected to the negative electrode N, or one reference resistor Rref may be connected to each of the positive electrode P and the negative electrode N. In this case, the reference resistor Rref connected to the positive electrode P and the reference resistor Rref connected to the negative electrode N may also have the same resistance value or different resistance values. The reference voltage Vref is divided by the "composite resistor (the first composite resistor Ra, the second composite resistor Rb, and the third composite resistor Rc)" described later and the reference resistor Rref. The voltage appearing at both ends of the composite resistor is the object voltage Vout of the detection object. In addition, the positive electrode P may be the same as the positive electrode (Vp) of the short-circuit detection device 11, and the negative electrode N may be the same as the negative electrode (earth) of the short-circuit detection device 11.

[0031] The first reference contact Q1 is a contact set on the positive electrode P side, and is a contact connected to the positive electrode P or a contact connected to the positive electrode P via a reference resistor Rref. The second reference contact Q2 is a contact set on the negative electrode N side, and is a contact connected to the negative electrode N or a contact connected to the negative electrode N via a reference resistor Rref. The target voltage Vout is a voltage detected to determine the short-circuit location BW, and is a voltage between the first target contact t1 and the second target contact t2. Figure 4 As shown in FIG. 1 and FIG. 2 , in this embodiment, the second object contact t2 is a contact connected to the negative electrode N, and thus the object voltage Vout is the voltage between the first object contact t1 and the ground. The voltage detector 5 detects the object voltage Vout. Figures 4 to 6In the example, the voltage detector 5 is a voltage sensor, but this is a conceptual diagram, and the voltage sensor may not necessarily be provided. For example, when the control device 7 includes a microcomputer having a functional unit such as an A / D converter that can determine the voltage value of an analog signal, the microcomputer can be used as the voltage detector 5. In particular, when the object voltage Vout is the voltage between the first object contact t1 and the ground as in the present embodiment, the voltage value can be easily detected by such a microcomputer.

[0032] The switch S has at least one open and close contact ( Figures 4 to 6 The first contactor S1 and the second contactor S2 shown in FIG. 1 are described in detail later, but as shown in FIG. Figure 8 As shown in FIG. 1 , the switch S may also include a third contactor S3. In addition, similarly, the details will be described later, but as Fig. 9 As shown, the switch S may also include a first contact contactor SB1, a second contact contactor SB2, a third contact contactor SW1, and a fourth contact contactor SW2. In the present embodiment, a short-circuit position detection device 12 including a switch S is exemplified, and the switch S includes at least two opening and closing contacts. That is, the switch S is a switch that switches at least the electrical connection between each of the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 and each of the first reference contact Q1 and the second reference contact Q2, thereby switching the circuit configuration of the two-terminal circuit 9 having the first object contact t1 and the second object contact t2 as terminals. Various methods are illustrated below for explanation, but the switch S is constructed in the following manner: the connection method of the first branch A1, the second branch A2 and the third branch A3 is switched in such a manner that the first branch A1, the second branch A2 and the third branch A3 are included in at least one two-terminal circuit 9, thereby being able to form at least three different two-terminal circuits 9.

[0033] exist Figures 4 to 6 In the embodiment shown, the switch S is composed of a first contactor S1 and a second contactor S2. The embodiment in which the switch S is composed of two contactors is one of the embodiments in which the number of contactors provided to the switch S is the smallest. The first contactor S1 is a contactor capable of disconnecting or connecting the connection between the second contact B2 and the negative electrode N (earth), and the second contactor S2 is a contactor capable of disconnecting or connecting the connection between the second contact B2 and the fourth contact W2. In addition, through the cooperation of the first contactor S1 and the second contactor S2, the second contact B2 and the fourth contact W2 can also be connected to the negative electrode N (earth). Figures 4 to 6 An example is shown in which different two-terminal circuits 9 are configured by making the opening and closing states of the first contactor S1 and the second contactor S2 different from each other.

[0034] exist Figures 4 to 6In the figure, the arrows show the direction of the current. Figures 4 to 6 In the manner shown, the first object contact t1 is fixed to the first contact B1, and the first contact B1 is connected to the first reference contact Q1. Therefore, the voltage of the first contact B1 becomes the object voltage Vout. The second object contact t2 includes at least the third contact W1. In other words, the third contact W1 is fixed to the second object contact t2. When the first contactor S1 is in the closed state, the second contact B2 also becomes the second object contact t2. In addition, when the first contactor S1 and the second contactor S2 are in the closed state, the second contact B2 and the fourth contact W2 also become the second object contact t2.

[0035] As described above, the second contactor S2 is a contactor capable of disconnecting or connecting the second contact B2 and the fourth contact W2. That is, the switch S may not only include an opening and closing contact for switching the electrical connection between each of the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 and each of the first reference contact Q1 and the second reference contact Q2, but also include an opening and closing contact capable of connecting two contacts of the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 of different conductors 1 to each other. As described later with reference to Fig. 9 As described above, the first jumper J1 , the second jumper J2 , the third jumper J3 , and the fourth jumper J4 can be provided as switch contacts capable of connecting two contacts of different conductors 1 to each other. Figures 4 to 6 The second contactor S2 shown is equivalent to Fig. 9 The switch contacts of the second jumper J2 in the manner shown.

[0036] exist Figure 4 In the embodiment shown, the first contactor S1 is in the open state (open), and the second contactor S2 is in the closed state (closed). Fig.11 The combined resistance (the first combined resistance Ra) of No. 8 (same as No. 8) is as shown in the following formula (1).

[0037] [Formula 1]

[0038] like Figure 4 As shown, the object voltage Vout of the detection object becomes the voltage obtained by dividing the voltage between the positive electrode P and the negative electrode N by the reference resistor Rref and the first combined resistor Ra. The value of the current that can flow through the reference resistor Rref is the same as the value of the current flowing through the first combined resistor Ra, so the following formula (2) holds.

[0039] [Formula 2]

[0040] The target voltage Vout is detected by the voltage detector 5, and the resistance value of the reference resistor Rref is known, so the value of the first combined resistor Ra is obtained by the following equation (3). Figure 5 and Figure 6 The same is true for the second combined resistor Rb and the third combined resistor Rc. Obviously, it is sufficient to change "Ra" in the formula (3) to "Rb" and "Rc" respectively.

[0041] [Formula 3]

[0042] Similarly, in Figure 5 In the embodiment shown, the first contactor S1 is in the closed state (closed), and the second contactor S2 is in the open state (opened). Fig.11 The composite resistance (the second composite resistance Rb) of No. 5 (same as No. 5) is as shown in the following formula (4).

[0043] [Formula 4]

[0044] Similarly, in Figure 6 In the embodiment shown, both the first contactor S1 and the second contactor S2 are in the disconnected state (open). Fig.11 The combined resistance (the third combined resistance Rc) of No. 3 (same as No. 3) is as shown in the following formula (5).

[0045] [Formula 5] Rc=R1+R3+R1=2·R1+R3…(5)

[0046] The short-circuit position detection device 12 solves the simultaneous equations of equations (1), (4), and (5) by using the values ​​of the first composite resistor Ra, the second composite resistor Rb, and the third composite resistor Rc obtained based on equation (3), and can obtain the first resistance value R1, the second resistance value R2, and the third resistance value R3.

[0047] That is, the short-circuit position detection device 12 calculates the composite resistances (first composite resistance Ra, second composite resistance Rb, third composite resistance Rc) of at least three different two-terminal circuits 9 based on the reference voltage Vref as the voltage between the positive electrode P and the negative electrode N, the resistance value of the reference resistance Rref, and the object voltage Vout (Formula (3)). Moreover, the short-circuit position detection device 12 calculates the first resistance value R1, the second resistance value R2, and the third resistance value R3 based on a plurality of the composite resistances (first composite resistance Ra, second composite resistance Rb, third composite resistance Rc). The first resistance value R1 is the resistance value of the first branch A1, the second resistance value R2 is the resistance value of the second branch A2, and the first wire B and the second wire W have the first branch A1 and the second branch A2. Therefore, the short-circuit location BW can be estimated based on at least one of the first resistance value R1 and the second resistance value R2.

[0048] As one solution, the short-circuit position detection device 12 can estimate the short-circuit location BW based on the resistance value per unit length of the first wire B and the second wire W and the first resistance value R1 or the second resistance value R2. In addition, the short-circuit position detection device 12 can also estimate the short-circuit location BW based on the total length of the first wire B and the second wire W and the ratio of the first resistance value R1 to the second resistance value R2. There is a linear relationship between the length of the wire 1 and the resistance value of the wire 1, so the short-circuit location BW can be estimated with good accuracy.

[0049] As described above, the short-circuit position detection device 12 calculates the combined resistances (the first combined resistance Ra, the second combined resistance Rb, and the third combined resistance Rc) of at least three different two-terminal circuits 9, and calculates the first resistance value R1, the second resistance value R2, and the third resistance value R3 based on the plurality of the combined resistances (the first combined resistance Ra, the second combined resistance Rb, and the third combined resistance Rc). The switch S only needs to have opening and closing contacts in a manner that can constitute at least three different two-terminal circuits 9. Figures 4 to 6 In the figure, a method is illustrated in which a jumper (second contactor S2) as an opening and closing contact is also provided, but of course, the jumper can also be omitted and only opening and closing contacts for switching the electrical connection between each of the first contact B1, the second contact B2, the third contact W1 and the fourth contact W2 and each of the first reference contact Q1 and the second reference contact Q2 can be provided. Figure 7 and Figure 8 An example of a method of switching the electrical connection by a switch S that does not include a jumper wire as an opening and closing contact is described.

[0050] Figure 7An example of a circuit configuration that does not include a jumper and can form three different two-terminal circuits 9 with a minimum number of open and close contacts is shown. In this example, the first contactor S1 selectively disconnects or connects the third contact W1 and the second reference contact Q2 (ground), and the second contactor S2 selectively disconnects or connects the second contact B2 and the second reference contact Q2 (ground). When the first contactor S1 and the second contactor S2 are both in the closed state (closed), a circuit similar to the circuit breaker 9 is formed. Fig.11 No.5 and Figure 5 When the first contactor S1 is in the closed state (closed) and the second contactor S2 is in the open state (opened), the same two-terminal circuit 9 is formed. Fig.11 No.3 and Figure 6 When the first contactor S1 is in the open state (open) and the second contactor S2 is in the closed state (closed), the same two-terminal circuit 9 is formed. Fig.11 The same two-terminal circuit as No.19.

[0051] Figure 8 An example of the circuit configuration of three different two-terminal circuits 9 that do not include a jumper and can form the simplest configuration of a combined resistor is shown. In this example, the switch S has three open and close contacts, the first contactor S1 selectively disconnects or connects the third contact W1 and the second reference contact Q2 (ground), the second contactor S2 selectively disconnects or connects the fourth contact W2 and the second reference contact Q2 (ground), and the third contactor S3 selectively disconnects or connects the second contact B2 and the second reference contact Q2 (ground).

[0052] When the first contactor S1 is in the closed state (closed), the second contactor S2 is in the open state (opened), and the third contactor S3 is in the open state (opened), the same Fig.11 No.3 and Figure 6 When the first contactor S1 is in the open state (open), the second contactor S2 is in the open state (open), and the third contactor S3 is in the closed state (closed), the same two-terminal circuit 9 is formed. Fig.11 When the first contactor S1 is in the open state (open), the second contactor S2 is in the closed state (closed), and the third contactor S3 is in the open state (open), a two-terminal circuit 9 is formed similar to No. 1. Fig.11 The same two-terminal circuit as No.29.

[0053] Above, as reference Figures 4 to 8As described above, the short-circuit position detection device 12 can properly determine the short-circuit location BW by being configured as follows: by switching the connection mode of the first branch A1, the second branch A2, and the third branch A3 in such a way that the first branch A1 having the first resistance value R1, the second branch A2 having the second resistance value R2, and the third branch A3 having the third resistance value R3 are included in at least one two-terminal circuit 9 through the switch S, so that at least three different two-terminal circuits 9 can be formed. The short-circuit position detection device 12 can be configured as follows: it can form a short-circuit location BW that can be formed by Figure 3 At least three of the two-terminal circuits 9 formed by the equivalent circuit in the short-circuit state shown in FIG. Figures 11 to 13 As illustrated in , 58 types of such two-terminal circuits 9 can be formed.

[0054] Fig. 9 The switch S having the opening and closing contacts capable of forming any two-terminal circuit 9 from 58 types of two-terminal circuits 9 is exemplified. Here, a mode having eight opening and closing contacts including a first contact contactor SB1, a second contact contactor SB2, a third contact contactor SW1, a fourth contact contactor SW2, a first jumper J1, a second jumper J2, a third jumper J3, and a fourth jumper J4 is exemplified.

[0055] The first contact contactor SB1 connects the first contact B1 exclusively to the first reference contact Q1 and the second reference contact Q2 in two closed states (closed) with different connection destinations, and sets the first contact B1 to an open state in an open state (open). Similarly, the second contact contactor SB2 connects the second contact B2 exclusively to the first reference contact Q1 and the second reference contact Q2 in a closed state (closed), and sets the second contact B2 to an open state in an open state (open). Similarly, the third contact contactor SW1 connects the third contact W1 exclusively to the first reference contact Q1 and the second reference contact Q2 in a closed state (closed), and sets the third contact W1 to an open state in an open state (open). Similarly, the fourth contact contactor SW2 connects the fourth contact W2 exclusively to the first reference contact Q1 and the second reference contact Q2 in the closed state (closed), and sets the second contact B2 to the open state in the open state (open).

[0056] The first contactor SB1, the second contactor SB2, the third contactor SW1, and the fourth contactor SW2 are exclusive, but can be said to have opening and closing contacts connected to the first reference contact Q1 and the second reference contact Q2, respectively. Fig. 9The short-circuit position detection device 12 shown can also be said to have eight switches (four switches each having one switch contact and four switches each having two switch contacts), and has 12 switch contacts.

[0057] The first jumper J1, the second jumper J2, the third jumper J3, and the fourth jumper J4 are switches having a single opening and closing contact. The first jumper J1 disconnects or connects the connection between the first contact B1 and the third contact W1. The second jumper J2 disconnects or connects the connection between the second contact B2 and the fourth contact W2. The third jumper J3 disconnects or connects the connection between the first contact B1 and the fourth contact W2. The fourth jumper J4 disconnects or connects the connection between the second contact B2 and the third contact W1.

[0058] As referenced Figures 4 to 8 As is clear from the above description, it is obvious that as long as the minimum number of three two-terminal circuits 9 can be formed, the switch S does not need to have the following Fig. 9 Therefore, of course, the short-circuit position detection device 12 may not have Fig. 9 A switch S with all open and close contacts is shown.

[0059] Fig.10 The two-terminal pair circuit (four-terminal circuit) that is the basis for forming the two-terminal circuit 9 by switching the connection mode of the first branch A1, the second branch A2, and the third branch A3 is shown. Figures 11 to 13 , 58 different connection methods are shown when the two-terminal pair circuit forms a two-terminal circuit. Figures 11 to 13 In , the arrow indicates the direction of the current. When the rear end of the arrow is located at the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2, it is shown that the contact is connected to the first reference contact Q1. That is, the rear end of the arrow corresponds to the first object contact t1 where the object voltage Vout appears. On the other hand, when the front end of the arrow is located at the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2, it is shown that the contact is connected to the second reference contact Q2 (ground). In addition, two contacts among the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 are shown in black, and when the two contacts are connected by a line, it is shown that the two contacts are connected by any one of the first jumper J1, the second jumper J2, the third jumper J3, and the fourth jumper J4.

[0060] Fig.11The following are circuit examples when only one of the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 becomes the first target contact t1. No. 1 to No. 9 are circuit examples when the first contact B1 becomes the first target contact t1. No. 10 to No. 18 are circuit examples when the second contact B2 becomes the first target contact t1. No. 19 to No. 27 are circuit examples when the third contact W1 becomes the first target contact t1. No. 28 to No. 36 are circuit examples when the fourth contact W2 becomes the first target contact t1.

[0061] Fig.12 Circuit examples are shown in the case where two contacts among the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2 become the first target contact t1. No.37 to No.39 are circuit examples in which the first contact B1 and the second contact B2 become the first target contact t1. No.40 to No.42 are circuit examples in which the first contact B1 and the fourth contact W2 become the first target contact t1. No.43 to No.45 are circuit examples in which the first contact B1 and the third contact W1 become the first target contact t1. No.46 to No.48 are circuit examples in which the second contact B2 and the fourth contact W2 become the first target contact t1. No.49 to No.51 are circuit examples in which the second contact B2 and the third contact W1 become the first target contact t1. No. 52 to No. 54 are circuit examples in which the third contact point W1 and the fourth contact point W2 serve as the first target contact point t1.

[0062] Fig.13 The circuit examples are shown in the case where three contacts, among the first contact B1, the second contact B2, the third contact W1, and the fourth contact W2, become the first target contact t1. No. 55 is a circuit example in which the first contact B1, the second contact B2, and the third contact W1 become the first target contact t1. No. 56 is a circuit example in which the first contact B1, the second contact B2, and the fourth contact W2 become the first target contact t1. No. 57 is a circuit example in which the first contact B1, the third contact W1, and the fourth contact W2 become the first target contact t1. No. 58 is a circuit example in which the second contact B2, the third contact W1, and the fourth contact W2 become the first target contact t1.

[0063] The fever detection device described above will be briefly summarized below.

[0064] As one scheme, a fever detection device is a fever detection device comprising the following components: a first conductive wire having a first contact and a second contact at both ends, respectively; and a second conductive wire having a third contact and a fourth contact at both ends, respectively. The fever detection device detects the following situation and detects the heating of the detection object: the first conductive wire and the second conductive wire, which are arranged along the detection object in a state of being adjacent to each other with an insulator softened at a preset temperature sandwiched therebetween, have become short-circuited due to the softening of the insulator caused by heat, and the fever detection device comprises a short-circuit position detection device for detecting the short-circuit portion of the first conductive wire and the second conductive wire, and the short-circuit position detection device comprises: a first object contact selected from at least one of the second contact, the third contact, and the fourth contact; a second object contact selected from at least one of the first contact, the second contact, the third contact, and the fourth contact except the first object contact; a reference resistor connected to at least one of the positive electrode and the negative electrode; a first reference contact connected to the positive electrode or to the positive electrode via the reference resistor; a second reference contact connected to the negative electrode or to the negative electrode via the reference resistor; a voltage detector detecting an object voltage as a voltage between the first object contact and the second object contact;and a switch having at least one opening and closing contact, wherein the switch is a switch that switches at least the electrical connection between each of the first contact, the second contact, the third contact, and the fourth contact and each of the first reference contact and the second reference contact, thereby switching the circuit structure of a two-terminal circuit having the first object contact and the second object contact as terminals, and when the first conductor and the second conductor are in a short-circuited state at the short-circuited portion, the contact of the first conductor at the short-circuited portion is used as a first short-circuited point, the contact of the second conductor at the short-circuited portion is used as a second short-circuited point, the branch from the first contact to the first short-circuited point and the branch from the third contact to the second short-circuited point are used as the first branch, and the branch from the first contact to the first short-circuited point and the branch from the third contact to the second short-circuited point are used as the first branch. The branch from the contact point to the second short-circuit point is a branch having a first resistance value that can be regarded as the same value as each other, the branch from the first short-circuit point to the second contact point and the branch from the second short-circuit point to the fourth contact point are the second branches, the branch from the first short-circuit point to the second contact point and the branch from the second short-circuit point to the fourth contact point are the branches having a second resistance value that can be regarded as the same resistance value as each other, the branch formed between the first short-circuit point and the second short-circuit point and having a third resistance value is the third branch, and the switch is configured in such a way that the connection mode of the first branch, the second branch and the third branch is switched so that the first branch, the second branch and the third branch are included in at least one of the two-terminal circuits, thereby forming at least three different two-terminal circuits. ;

[0065] According to this structure, the connection state of the first wire and the second wire with the first reference contact on the positive side and the second reference contact on the negative side can be switched by a switch, thereby making at least three two-terminal circuits. In each two-terminal circuit, at least one of the unknown first resistance value, the second resistance value, and the third resistance value is included, so that the three unknown resistance values ​​can be obtained by the simultaneous equations based on the three different two-terminal circuits. By determining the third resistance value that can take various values ​​according to the short-circuit mode at the short-circuit position, the values ​​of the first resistance value and the second resistance value can also be determined with good accuracy. The resistance value of the wire has a linear relationship with the length of the wire, so by determining the first resistance value and the second resistance value as the resistance value of the wire, the short-circuit position can be estimated with good accuracy. That is, according to this structure, the short-circuit position can also be determined with good accuracy by referring to the resistance value between the first wire and the second wire at the short-circuit position.

[0066] Here, preferably, the switch further includes the opening and closing contact capable of connecting two contacts among the first contact, the second contact, the third contact, and the fourth contact of different conducting wires to each other.

[0067] According to this configuration, more types of two-terminal circuits can be formed compared to the case where the electrical connection between each of the first, second, third and fourth contacts and each of the first and second reference contacts is switched.

[0068] In addition, it is suitable that the short-circuit position detection device performs as follows: based on the voltage between the positive electrode and the negative electrode, the resistance value of the reference resistor and the target voltage, respectively calculate the combined resistance of at least three different two-terminal circuits, calculate the first resistance value, the second resistance value and the third resistance value based on a plurality of the combined resistances, and infer the short-circuit position based on at least one of the first resistance value and the second resistance value.

[0069] In each two-terminal circuit, at least one of the unknown first resistance value, the second resistance value, and the third resistance value is included, so the three unknown resistance values ​​can be obtained by the simultaneous equations based on the values ​​of the three different synthetic resistors. By determining the third resistance value that can take various values ​​according to the short-circuit mode at the short-circuit position, the values ​​of the first resistance value and the second resistance value can also be determined with good accuracy. The first resistance value and the length of the first branch, as well as the second resistance value and the length of the second branch, have a linear relationship with the overall resistance value and the overall length of the first wire and the second wire, so the values ​​converted into the first resistance value and the second resistance value are determined, and the lengths of the first branch and the second branch can also be determined with good accuracy. Therefore, the short-circuit position can be determined with good accuracy.

[0070] Furthermore, preferably, the short-circuit position detection device estimates the short-circuit location based on a ratio between the total length of the first conductive wire and the second conductive wire and the first resistance value and the second resistance value.

[0071] There is a linear relationship between the length of the wire and the resistance value of the wire, so the ratio of the first resistance value to the second resistance value is equal to the ratio of the length of the first branch in the first wire to the length of the second branch, and is equal to the ratio of the length of the first branch in the second wire to the length of the second branch. Therefore, with this configuration, the short-circuit location can be estimated with good accuracy.

[0072] Furthermore, preferably, the short-circuit position detection device estimates the short-circuit location based on the resistance value per unit length of the first conductive wire and the second conductive wire and the first resistance value or the second resistance value.

[0073] There is a linear relationship between the length of the wire and the resistance value of the wire, so the relationship between the resistance value per unit length and the first resistance value has a linear relationship with the length of the first branch, and the relationship between the resistance value per unit length and the second resistance value has a linear relationship with the length of the second branch. Therefore, through this configuration, the short-circuit location can be estimated with good accuracy. [Description of Reference Numerals]

[0074] 2: Insulator 5: Voltage detector 8: Power supply line (detection object) 9: Two-terminal circuit 10: Fever detection device 12: Short circuit position detection device A1: Branch 1 A2: Branch 2 A3: Branch 3 B: 1st conductor B1: 1st contact B2: 2nd contact B3: First short circuit point BW: short circuit part J1: Jumper 1 (open / close contact) J2: Jumper 2 (open / close contact) J3: Jumper 3 (open / close contact) J4: 4th jumper (open / close contact) N: Negative electrode P: Positive electrode Q1: 1st reference contact Q2: Second reference contact R1: 1st resistor value R2: Second resistance value R3: The third resistor value Ra: 1st combined resistance (combined resistance) Rb: Second composite resistance (composite resistance) Rc: 3rd composite resistance (composite resistance) Rref: reference resistance S: Switch S1: 1st contactor (opening and closing contact) S2: Second contactor (opening and closing contact) S3: The third contactor (opening and closing contact) SB1: 1st contact contactor (opening and closing contact) SB2: Second contact contactor (opening and closing contact) SW1: 3rd contact contactor (opening and closing contact) SW2: 4th contact contactor (opening and closing contact) Vout: target voltage Vref: reference voltage (voltage between positive and negative electrodes) W: 2nd conductor W1: 3rd contact W2: 4th contact W3: Second short circuit point t1: 1st contact point t2: Second contact point

Claims

1. A fever detection device, comprising the following components: a first conductive wire having a first contact and a second contact at both ends thereof; and The second conductor has a third contact and a fourth contact at both ends, The heat detection device detects the heat generation of the detection object by detecting that the first and second conductors, which are arranged along the detection object in a state of being adjacent to each other with an insulator softened at a preset temperature sandwiched therebetween, have become short-circuited due to softening of the insulator caused by heat, The fever detection device has the following characteristics: The heat detection device includes a short-circuit position detection device for detecting a short-circuit position between the first conductive wire and the second conductive wire. The short-circuit position detection device comprises: a first target contact selected from at least one of the first contact, the second contact, the third contact, and the fourth contact; a second target contact selected from at least one of the first contact, the second contact, the third contact, and the fourth contact except the first target contact; a reference resistor connected to at least one of the positive electrode and the negative electrode; a first reference contact, which is a contact connected to the positive electrode or a contact connected to the positive electrode via the reference resistor; a second reference contact, which is a contact connected to the negative electrode or a contact connected to the negative electrode via the reference resistor; a voltage detector that detects a target voltage that is a voltage between the first target contact and the second target contact; and A switch having at least one open and closed contact, The switch is a switch that switches at least the electrical connection between each of the first contact, the second contact, the third contact, and the fourth contact and each of the first reference contact and the second reference contact, thereby switching the circuit configuration of a two-terminal circuit having the first object contact and the second object contact as terminals. When the first conductive wire and the second conductive wire are in a short-circuited state at the short-circuited portion, a contact point of the first conductive wire at the short-circuited portion is used as a first short-circuited point. The contact point of the second conductor at the short-circuit position is used as a second short-circuit point, The branch from the first contact to the first short-circuit point and the branch from the third contact to the second short-circuit point are referred to as first branches, and the branch from the first contact to the first short-circuit point and the branch from the third contact to the second short-circuit point are branches having first resistance values ​​that can be regarded as being the same value as each other, The branch from the first short-circuit point to the second contact and the branch from the second short-circuit point to the fourth contact are defined as second branches, and the branch from the first short-circuit point to the second contact and the branch from the second short-circuit point to the fourth contact are branches having second resistance values ​​that can be regarded as having the same resistance value. A branch formed between the first short-circuit point and the second short-circuit point and having a third resistance value is referred to as a third branch, The switch is constructed as follows: At least three different two-terminal circuits can be formed by switching the connection modes of the first branch, the second branch, and the third branch so that the first branch, the second branch, and the third branch are included in at least one of the two-terminal circuits.

2. The fever detection device according to claim 1, wherein: The switch further includes the opening and closing contact capable of connecting two contacts among the first contact, the second contact, the third contact, and the fourth contact of different conducting wires to each other.

3. The fever detection device according to claim 1 or 2, wherein: The short circuit position detection device is implemented as follows: calculating at least three different combined resistances of the two-terminal circuits based on the voltage between the positive electrode and the negative electrode, the resistance value of the reference resistor, and the target voltage, The first resistance value, the second resistance value, and the third resistance value are calculated based on the plurality of combined resistances. The short-circuit location is estimated based on at least one of the first resistance value and the second resistance value.

4. The fever detection device according to claim 3, wherein: The short-circuit position detection device estimates the short-circuit location based on the ratio between the total length of the first conductive wire and the second conductive wire and the first resistance value and the second resistance value.

5. The fever detection device according to claim 3, wherein: The short-circuit position detection device estimates the short-circuit location based on the resistance value per unit length of the first conductive wire and the second conductive wire and the first resistance value or the second resistance value.

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