Temperature monitoring device

Abstract

Provided is a temperature monitoring device that can monitor the temperature of switches with good responsiveness.　A temperature monitoring device (10) comprises switches (91C, 91D), temperature sensor units (30, 31), and a control unit (80). The switches (91C, 91D) are respectively provided between first power paths (91E, 91F) and second power paths (91G, 91H) in power paths (P) for supplying power to a power supply target (S). The temperature sensor units (30, 31) output signals (St) capable of specifying the temperatures of the switches (91C, 91D). The switches (91C, 91D) respectively have first terminals (91J, 91K) electrically connected to the first power paths (91E, 91F) and second terminals (91L, 91M) electrically connected to the second power paths (91G, 91H). Furthermore, the temperature monitoring device (10) comprises energization units (30C, 31C) that respectively cause current to flow between portions of the temperature sensor units (30, 31) and the first terminals (91J, 91K).

Description

Technical Field

[0001] This disclosure relates to a temperature monitoring device.

Background Art

[0002] Patent Document 1 discloses a configuration in which a thermistor is arranged on a bus bar of a system main relay (switch) after being insulated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the thermistor is insulated, heat is difficult to transfer to the thermistor due to the insulation coating, and it may become difficult to monitor the temperature with good responsiveness.

[0005] This disclosure is made based on the above circumstances, and an object thereof is to provide a temperature monitoring device capable of monitoring the temperature of a switch with good responsiveness.

Means for Solving the Problems

[0006] The temperature monitoring device of this disclosure includes a switch provided between a first power path and a second power path in a power path that supplies power to a power supply target, a temperature sensor unit that outputs a signal capable of specifying the temperature of the switch, and a control unit that processes temperature information based on the signal output from the temperature sensor unit. The switch has a first terminal electrically connected to the first power line and a second terminal electrically connected to the second power line, and switches between an allow state that permits energization through the switch between the first terminal and the second terminal and an interrupted state that interrupts energization through the switch. Furthermore, the device includes an energizing section that conducts current between a part of the temperature sensor section and either the first terminal or the second terminal. [Effects of the Invention]

[0007] According to this disclosure, the temperature of the switchgear can be monitored with good responsiveness. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing the temperature monitoring device of Embodiment 1 installed in a power supply system. [Modes for carrying out the invention]

[0009] Embodiments of the present disclosure are listed and illustrated below. The features described in [1] to [6] below may be combined in any way that is not contradictory.

[0010] [1] The temperature monitoring device of the present disclosure comprises a switch, a temperature sensor unit, and a control unit. The switch is installed between a first power line and a second power line in a power line supplying power to a power supply target. The temperature sensor unit outputs a signal that can identify the temperature of the switch. The control unit processes temperature information based on the signal output from the temperature sensor unit. The switch has a first terminal electrically connected to the first power line and a second terminal electrically connected to the second power line, and switches between an allow state that permits energization through the switch between the first and second terminals and an interrupted state that interrupts energization through the switch. Furthermore, it includes a current-carrying unit that conducts current between a part of the temperature sensor unit and either the first terminal or the second terminal.

[0011] In the temperature monitoring device described in [1] above, the temperature sensor is connected to either the first or second terminal of the switch so that current flows through it. This makes it easier for heat from the switch to be transferred to the temperature sensor, allowing the temperature sensor to detect the temperature with good responsiveness.

[0012] [2] In the temperature monitoring device described in [1] above, the control unit may have an input unit into which a signal is input, an output unit which is a path for outputting output information to other devices, and an insulating unit provided in the signal path between the input unit and the output unit. The insulating unit can transmit a signal based on temperature information to the transmission path while insulating the input path from the input unit side from the transmission path to the other devices side in the signal path.

[0013] In the temperature monitoring device described in [2] above, if the voltage values ​​differ between the temperature sensor side and the other equipment side in the signal path, the insulating part can prevent the temperature sensor side and the other equipment side in the signal path from influencing each other.

[0014] [3] In the temperature monitoring device described in [1] or [2] above, at least one of the first power line and the second power line may have a busbar and be electrically connected in a configuration in which either the first terminal or the second terminal is short-circuited to the busbar. A part of the temperature sensor may be electrically connected in a configuration in which it is short-circuited to the busbar.

[0015] The temperature monitoring device described in [3] above is easy to construct in terms of the structure for attaching the temperature sensor.

[0016] [4] In the temperature monitoring device described in [1] or [2] above, the temperature sensor unit has a thermistor having one terminal and another terminal, and the one terminal can be short-circuited to either the first terminal or the second terminal.

[0017] In the temperature monitoring device described in [4] above, heat from the first or second terminal is easily transferred directly to the temperature sensor.

[0018] [5] In the temperature monitoring device of [1] or [2] above, the temperature sensor unit may have a voltage dividing circuit unit in which a resistor and a thermistor are connected in series. A predetermined voltage is applied between one end on the resistor side and the other end on the thermistor side in the voltage dividing circuit unit, one end or the other end is short-circuited to either the first terminal or the second terminal, and the voltage dividing circuit unit can output a voltage dividing signal as a signal.

[0019] The temperature monitoring device of [5] above can adjust and output a signal reflecting the voltage across both ends of the thermistor to an appropriate level by the voltage dividing circuit unit. Moreover, since the heat of the first terminal or the second terminal is likely to be transmitted to the ends of the voltage dividing circuit unit, the voltage dividing signal becomes a signal that more accurately reflects the temperature of the switch.

[0020] [6] In the temperature monitoring device of [1] or [2] above, it may have an insulated power supply unit that generates an output voltage based on the power from a second power supply unit different from the power supply unit that supplies power to the power supply target. The insulated power supply unit can apply the output voltage to a predetermined conductive path while insulating between the power supply unit and the second power supply unit. The temperature sensor unit can output a signal while causing a current to flow between a part that is short-circuited to the power path and another part that is different from the part and is short-circuited to the conductive path.

[0021] The temperature monitoring device of [6] above generates an output voltage based on the power of a second power supply unit different from the power supply unit. Therefore, even if there is a fluctuation in the output voltage of the power supply unit, the output voltage applied to the voltage dividing circuit unit does not fluctuate. For this reason, it is easy to perform stable temperature monitoring.

[0022] [Details of Embodiments of the Present Disclosure]

[0023] [Embodiment 1] The temperature monitoring device 10 according to Embodiment 1 will be described with reference to FIG. 1. FIG. 1 illustrates a power supply system 100 provided with the temperature monitoring device 10 according to Embodiment 1. The power supply system 100 has a power supply unit 91 and is mounted on a vehicle not shown. The power supply system 100 is a system that supplies power from the power supply unit 91 to a power supply target S, which is a load mounted on the vehicle, and operates this load.

[0024] The power supply unit 91 can be, for example, a lead-acid battery or a lithium-ion battery. The positive electrode of the power supply unit 91 is electrically connected to the positive electrode power line 91A. The negative electrode of the power supply unit 91 is electrically connected to the negative electrode power line 91B. The positive electrode of the power supply unit 91 applies a constant DC voltage to the positive electrode power line 91A. The voltage applied by the power supply unit 91 to the positive electrode power line 91A may vary slightly from this constant value. The positive electrode power line 91A and the negative electrode power line 91B are power lines P that supply power to the power supply target S. The portions of the positive electrode power line 91A and the negative electrode power line 91B on the power supply unit 91 side are the first power lines 91E and 91F. The portions of the positive electrode power line 91A and the negative electrode power line 91B on the power supply target S side are the second power lines 91G and 91H. Busbars B are provided at the ends of the first power lines 91E and 91F opposite to the power supply unit 91, and at the ends of the second power lines 91G and 91H opposite to the power supply target S.

[0025] In this disclosure, "electrically connected" preferably means a configuration in which the two connected objects are connected in a state of conduction (a state in which current can flow) such that the potentials of both objects are equal. However, the disclosure is not limited to this configuration. For example, "electrically connected" may mean a configuration in which the two connected objects are connected in a state in which they can conduct electricity while an electrical component is interposed between them.

[0026] [Configuration of the temperature monitoring device] The temperature monitoring device 10 comprises switches 91C, 91D, temperature sensor units 30, 31, energizing units 30C, 31C, and a control unit 80. The control unit 80 includes input units consisting of AD converters 40, 41, insulating units 50, 51, an MCU 60, and an output unit 65.

[0027] [Switch configuration] Switches 91C and 91D are provided in the positive-side power path 91A and the negative-side power path 91B, respectively. Relay switches such as semiconductor relays or mechanical relays are used for switches 91C and 91D. Switches 91C and 91D have first terminals 91J and 91K and second terminals 91L and 91M. Switches 91C and 91D have a function to switch between an allowable state, which permits energization through switches 91C and 91D between the first terminals 91J and 91K and the second terminals 91L and 91M, and an interrupted state, which interrupts energization through switches 91C and 91D.

[0028] Switches 91C and 91D are installed between the first power lines 91E and 91F and the second power lines 91G and 91H. Specifically, the first terminals 91J and 91K are electrically connected in a short-circuit configuration to the busbar B of the first power lines 91E and 91F. The second terminals 91L and 91M are electrically connected in a short-circuit configuration to the busbar B of the second power lines 91G and 91H. In this disclosure, "short-circuit" means a configuration in which the electrical connections are made such that the potentials of both connected objects are equal and they conduct to each other (allowing current to flow).

[0029] [Temperature sensor unit configuration] Temperature sensor units 30 and 31 are provided one each in the positive-side power circuit 91A and the negative-side power circuit 91B. The temperature sensor unit 30 provided in the positive-side power circuit 91A has a thermistor 30A and a resistor 30B. The temperature sensor unit 31 provided in the negative-side power circuit 91B has a thermistor 31A and a resistor 31B.

[0030] Thermistors 30A and 31A have the characteristic of changing their resistance value with temperature. Thermistors 30A and 31A are not concealed by an insulator such as glass, and are configured with a pair of terminals (one terminal 30D, 31D and the other terminal 30E, 31E) provided on the element whose resistance value changes with temperature. For example, NTC thermistors (Negative Temperature Coefficient Thermistor) and PTC thermistors (Positive Temperature Coefficient Thermistor) are used for thermistors 30A and 31A.

[0031] Each of the resistors 30B and 31B has a pair of terminals (one terminal 30G, 31G and the other terminal 30H, 31H). One terminal 30G of resistor 30B is electrically connected to the other terminal 30E of thermistor 30A. One terminal 31G of resistor 31B is electrically connected to the other terminal 31E of thermistor 31A.

[0032] The thermistor 30A and resistor 30B of the temperature sensor unit 30 are connected in series to form a voltage divider circuit unit 30F. The thermistor 31A and resistor 31B of the temperature sensor unit 31 are connected in series to form a voltage divider circuit unit 31F. The other terminals 30H, 31H of resistors 30B, 31B are one end of the voltage divider circuits unit 30F, 31F on the side of resistors 30B, 31B. The other terminals 30E, 31E of thermistors 30A, 31A are the other end of the voltage divider circuits unit 30F, 31F on the side of thermistors 30A, 31A.

[0033] [Configuration of the power supply section] For the energized parts 30C and 31C, for example, electric wires, conductive circuit patterns formed on a circuit board, or solder can be used. For example, when a circuit board is used, the energized parts 30C and 31C are provided on the circuit board as circuit patterns, and thermistors 30A and 31A are attached to the energized parts 30C and 31C using solder. Then, the circuit board can be fastened to the busbar B with bolts or the like so that the energized parts 30C and 31C are in contact with the busbar B. The energized part 30C is electrically connected to the busbar B of the first power line 91E by short-circuiting one terminal 30D, which is part of the thermistor 30A. The energized part 31C is electrically connected to the busbar B of the first power line 91F by short-circuiting one terminal 31D, which is part of the thermistor 31A. The energizing sections 30C and 31C can conduct current between a portion of the temperature sensor sections 30 and 31 (one terminal 30D and 31D) and the first terminals 91J and 91K.

[0034] The other ends of the voltage divider circuits 30F and 31F (terminals 30D and 31D of thermistors 30A and 31A) are short-circuited to the first terminals 91J and 91K via the energized sections 30C and 31C and busbar B. The portion where one terminal 30G and 31G of resistors 30B and 31B is electrically connected to the other terminal 30E and 31E of thermistors 30A and 31A is configured to output a signal St that can identify the temperature of switches 91C and 91D toward the AD converters 40 and 41, which will be described later. Here, the temperature-identifiable signal St can be, for example, a voltage value or a current value.

[0035] [Configuration of the control unit] The control unit 80 is configured to process temperature information Ti based on signals St output from temperature sensor units 30 and 31. Here, the temperature information Ti based on signals St can be, for example, a digital signal obtained by digitally converting signals St. The AD converters 40 and 41 are configured as semiconductor elements that have the function of converting analog signals into digital signals. The AD converters 40 and 41 have input terminals 40A and 41A into which analog signals are input, and output terminals 40B and 41B that output the digital signals obtained by converting the input analog signals. The input terminal 40A of the AD converter 40 is electrically connected to the part where one terminal 30G of the resistor 30B is connected to the other terminal 30E of the thermistor 30A. The input terminal 41A of the AD converter 41 is electrically connected to the part where one terminal 31G of the resistor 31B is connected to the other terminal 31E of the thermistor 31A. Signals St from the temperature sensor units 30 and 31 are input to the AD converters 40 and 41. The output terminal 40B of the AD converter 40 is electrically connected to the input terminal 50A of the insulating unit 50, which will be described later. The output terminal 41B of the AD converter 41 is electrically connected to the input terminal 51A of the insulating unit 51, which will be described later.

[0036] [Insulation structure] The insulating sections 50 and 51 are provided in the signal path between the AD converters 40 and 41 and the output section 65, which will be described later. The insulating sections 50 and 51 insulate the signal path connected to the input terminals 50A and 51A (the input path on the AD converter 40 and 41 side) from the signal path connected to the output terminals 50B and 51B (the transmission path to the other device 70 side). At the same time, the insulating sections 50 and 51 are formed as semiconductor elements that have the function of transmitting a temperature signal based on temperature information Ti from the input terminals 50A and 51A to the output terminals 50B and 51B via the signal path connected to the output terminals 50B and 51B (the transmission path to the other device 70 side). For example, digital isolators are used for the insulating sections 50 and 51. The output terminals 50B and 51B of the insulating sections 50 and 51 are electrically connected to the input terminals 60A and 61A of the MCU 60, which will be described later.

[0037] [MCU and output section configuration] The MCU60 is configured, for example, as an MCU (Micro Controller Unit). The MCU60 has the function of processing temperature information Ti input from the isolation units 50 and 51 and transmitting it to the output unit 65. The output unit 65 is electrically connected to another device 70 and has the function of outputting the temperature information Ti from the MCU60 as output information Se to the other device 70. The output unit 65 is a so-called output interface.

[0038] [Configuration of the second power supply unit] The temperature monitoring device 10 is supplied with power based on the output voltage of a second power supply unit 92, which is different from the power supply unit 91. The second power supply unit 92 can be, for example, a lead-acid battery or a lithium-ion battery. The positive electrode of the second power supply unit 92 is electrically connected to the second positive electrode power line 92A. The negative electrode of the second power supply unit 92 is electrically connected to the second negative electrode power line 92B. The positive electrode of the second power supply unit 92 applies a constant DC voltage to the second positive electrode power line 92A. The voltage applied by the second power supply unit 92 to the second positive electrode power line 92A may fluctuate slightly from this constant value. The potential difference between the second positive electrode power line 92A and the second negative electrode power line 92B (i.e., the output voltage of the second power supply unit 92) is smaller than the potential difference between the positive electrode power line 91A and the negative electrode power line 91B (i.e., the output voltage of the power supply unit 91).

[0039] [Configuration of isolated power supply unit and internal power supply unit] Between the second positive-side power path 92A and the second negative-side power path 92B, isolated power supply units 93, 94 and an internal power supply unit 95 are interposed. The isolated power supply units 93, 94 have the function of generating output voltages to be applied to the temperature sensor units 30, 31, the AD converters 40, 41, and the insulating units 50, 51 based on the power of the second power supply unit 92. For example, isolated DC-DC converters are used for the isolated power supply units 93, 94.

[0040] The isolated power supply unit 93 insulates the power supply unit 91 and the second power supply unit 92 while applying the output voltage V1 to the conductive path 93A. The output voltage V1 is referenced to the potential of the positive-side power path 91A and has a predetermined potential difference from the potential of the positive-side power path 91A. The other terminal 30H of the resistor 30B, which is another part of the temperature sensor unit 30, is electrically connected to the conductive path 93A by short-circuiting. The other terminal 30H is different from the first terminal 30D. As a result, the output voltage V1 is applied to the other terminal 30H of the temperature sensor unit 30. The output voltage V1 is also applied to the AD converter 40 and the insulating unit 50 via the conductive path 93A. The AD converter 40 and the insulating unit 50 are electrically connected to the positive-side power path 91A.

[0041] The isolated power supply unit 94 insulates the power supply unit 91 and the second power supply unit 92 while applying the output voltage V2 to the conductive path 94A. The output voltage V2 is referenced to the potential of the negative electrode power path 91B and has a predetermined potential difference from the potential of the negative electrode power path 91B. The other terminal 31H of the resistor 31B, which is another part of the temperature sensor unit 31, is electrically connected to the conductive path 94A by short-circuiting. The other terminal 31H is different from the first terminal 31D. As a result, the output voltage V2 is applied to the other terminal 31H of the temperature sensor unit 31. The output voltage V2 is also applied to the AD converter 41 and the insulating unit 51 via the conductive path 94A. The AD converter 41 and the insulating unit 51 are electrically connected to the negative electrode power path 91B.

[0042] A predetermined voltage based on the output voltage V1 of the conductive path 93A and the voltage of the positive-side power path 91A is applied between one end and the other end of the voltage divider circuit 30F. A predetermined voltage based on the output voltage V2 of the conductive path 94A and the voltage of the negative-side power path 91B is applied between one end and the other end of the voltage divider circuit 31F. The voltage divider circuits 30F and 31F output a divided voltage signal as a signal St. In other words, the temperature sensor units 30 and 31 output a signal St while allowing current to flow between one part (one terminal 30D, 31D) and the other part (the other terminal 30H, 31H).

[0043] The internal power supply unit 95 has the function of generating power to supply to the isolation units 50, 51 and the MCU 60 based on the output voltage of the second power supply unit 92. The internal power supply unit 95 is configured as a voltage regulator, such as a linear regulator or a switching regulator.

[0044] The output voltage V3 generated in the internal power supply unit 95 is applied to the insulating units 50, 51 and MCU 60 via the internal conductive path 95A. The insulating units 50, 51 and MCU 60 are electrically connected to the second negative electrode power path 92B.

[0045] The output unit 65 has the voltage of the second positive power line 92A (i.e., the output voltage of the second power supply unit 92) applied to it. The output unit 65 is electrically connected to the second negative power line 92B.

[0046] Next, we will illustrate the effects of this configuration. The temperature monitoring device 10 comprises switches 91C and 91D, temperature sensor units 30 and 31, and a control unit 80. The switches 91C and 91D are installed between the first power lines 91E and 91F and the second power lines 91G and 91H in the power line P that supplies power to the power supply target S. The temperature sensor units 30 and 31 output a signal St that can identify the temperature of the switches 91C and 91D. The control unit 80 processes temperature information Ti based on the signal St output from the temperature sensor units 30 and 31. The switches 91C and 91D have first terminals 91J and 91K that are electrically connected to the first power lines 91E and 91F, and second terminals 91L and 91M that are electrically connected to the second power lines 91G and 91H. The switches 91C and 91D switch between an allowable state, which permits energization between the first terminals 91J and 91K and the second terminals 91L and 91M via the switches 91C and 91D, and an interrupted state, which interrupts the energization via the switches 91C and 91D. Furthermore, the temperature monitoring device 10 includes a portion of the temperature sensor sections 30 and 31 and energizing sections 30C and 31C that conduct current between them and the first terminals 91J and 91K.

[0047] In this configuration, the temperature sensor units 30 and 31 are connected to the first terminals 91J and 91K of the switches 91C and 91D so that current flows through them, making it easier for heat from the switches 91C and 91D to be transferred to the temperature sensor units 30 and 31. As a result, the temperature sensor units 30 and 31 can detect temperature with good responsiveness.

[0048] The control unit 80 includes AD converters 40 and 41 to which the signal St is input, an output unit 65 which is a path for outputting output information Se to other equipment 70, and insulating units 50 and 51 provided in the signal path between the AD converters 40 and 41 and the output unit 65. The insulating units 50 and 51 transmit the signal based on temperature information Ti to the transmission path while insulating the input path from the AD converters 40 and 41 side from the transmission path to other equipment 70 side in the signal path.

[0049] In the signal path, if the voltage values ​​differ between the temperature sensor units 30 and 31 and the other device 70, the insulating units 50 and 51 can prevent the temperature sensor units 30 and 31 and the other device 70 from influencing each other in the signal path.

[0050] In the temperature monitoring device 10, the first power lines 91E, 91F and the second power lines 91G, 91H have a busbar B. The first terminals 91J, 91K and the second terminals 91L, 91M are electrically connected to the busbar B in a short-circuit configuration, and parts of the temperature sensor units 30, 31 are electrically connected to the busbar B in a short-circuit configuration. This configuration makes it easy to construct a structure for mounting the temperature sensor units 30, 31.

[0051] In the temperature monitoring device 10, the temperature sensor units 30 and 31 have thermistors 30A and 31A, each having one terminal 30D and 31D and the other terminals 30E and 31E. The one terminals 30D and 31D are short-circuited to the first terminals 91J and 91K via the energized sections 30C and 31C and the busbar B. With this configuration, the heat from the first terminals 91J and 91K is easily transferred directly to the temperature sensor units 30 and 31.

[0052] In the temperature monitoring device 10, the temperature sensor units 30 and 31 have voltage divider circuits 30F and 31F in which resistors 30B and 31B and thermistors 30A and 31A are connected in series. A predetermined voltage is applied between one end of the voltage divider circuits 30F and 31F on the side of resistors 30B and 31B and the other end on the side of thermistors 30A and 31A. The other end is short-circuited to the first terminals 91J and 91K, and the voltage divider circuits 30F and 31F output a divided voltage signal as a signal St. With this configuration, the signal St, which reflects the voltage across the thermistors 30A and 31A, can be adjusted to an appropriate level by the voltage divider circuits 30F and 31F and output. Moreover, since the heat from the first terminals 91J and 91K is easily transferred to the other end of the voltage divider circuits 30F and 31F, the divided voltage signal becomes a signal that more accurately reflects the temperature of the switches 91C and 91D.

[0053] The temperature monitoring device 10 has isolated power supply units 93 and 94 that generate an output voltage based on power from a second power supply unit 92, which is different from the power supply unit 91 that supplies power to the power supply target S. The isolated power supply units 93 and 94 apply an output voltage to predetermined conductive paths 93A and 94A while insulating the power supply unit 91 from the second power supply unit 92. The temperature sensor units 30 and 31 have a portion (one terminal 30D, 31D) that is short-circuited to the positive power path 91A and the negative power path 91B, and another portion (the other terminal 30H, 31H) that is short-circuited to the conductive paths 93A and 94A, and output a signal St while current flows between the portion and the other portion. With this configuration, since the output voltage is generated based on the power from the second power supply unit 92, which is different from the power supply unit 91, even if the output voltage of the power supply unit 91 fluctuates, the voltage applied from the second power supply unit 92 to the temperature sensor units 30 and 31 does not fluctuate. For this reason, stable temperature monitoring is easy.

[0054] <Other Embodiments> The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, but is indicated by the claims, and all modifications within the meaning and scope of the claims are intended to be included.

[0055] Unlike Embodiment 1, instead of a thermistor, a diode or a temperature sensor IC using a diode may be used, and one of the terminals of these may be short-circuited to either the first or second terminal of the switch.

[0056] Unlike Embodiment 1, the temperature sensor may be provided in only one of either the positive electrode power circuit or the negative electrode power circuit.

[0057] Unlike Embodiment 1, the insulating section may be interposed between the control unit and the output unit.

[0058] Unlike Embodiment 1, in the isolated power supply unit, a voltage generated based on the output voltage of the power supply unit may be applied to the temperature sensor unit, AD converter, isolation unit, and control unit.

[0059] Unlike Embodiment 1, the energized section may be in a state that allows constant energization, or it may be configured to switch to a state that cuts off the energization. Furthermore, it is more desirable that a part of the temperature sensor section and the first terminal are always short-circuited.

[0060] Unlike Embodiment 1, a configuration in which a busbar is provided in only one of the first power line or the second power line is also possible.

[0061] Unlike Embodiment 1, one end of the resistor side of the voltage divider circuit (the other terminal) may be short-circuited to the busbar.

[0062] Unlike Embodiment 1, the current-carrying section may electrically connect a part of the temperature sensor section (one terminal) to the second terminal. [Explanation of Symbols]

[0063] 10…Temperature monitoring device 30, 31… Temperature sensor section 30A, 31A... Thermistor 30B,31B…Resistor 30C,31C…Electrifying part 30D,31D…One terminal 30E, 31E…Other terminals 30F, 31F... Voltage divider circuit section 30G, 31G... one-way terminal 30H, 31H… Other terminals 40, 41…AD converter (input section) 40A, 41A... Input terminals of the AD converter 40B, 41B... Output terminals of the AD converter 50, 51… Insulation part 50A, 51A... Input terminals of the insulated section 50B, 51B... Output terminals of the insulated section 60…MCU 60A, 61A…Input terminals of the MCU 65…Output section 70…Other devices 80... Control Unit 91...Power supply section 91A... Positive side power line 91B…Negative side power path 91C, 91D… Switches 91E, 91F…1st power path 91G, 91H…Second power path 91J,91K…1st terminal 91L, 91M…Second terminal 92…Second power supply section 92A... Second positive electrode power line 92B...Second negative side power path 93, 94…Isolated power supply unit 93A, 94A… Conductive circuits 95…Internal power supply section 95A…Internal conductive path 100... Power System B...bus bar P...Power path S...Target of electricity supply Se... Output Information St…Signal Ti…Temperature information V1, V2, V3… Output voltage

Claims

1. A switch installed between the first power line and the second power line in a power line supplying power to a target power supply, A temperature sensor unit that outputs a signal capable of specifying the temperature of the switch, The system comprises a control unit that processes temperature information based on the signal output from the temperature sensor unit, The switch has a first terminal electrically connected to the first power line and a second terminal electrically connected to the second power line, and switches between an allow state that permits energization through the switch between the first terminal and the second terminal and an interrupted state that interrupts energization through the switch. Furthermore, the device includes a current-carrying section that conducts current between a part of the temperature sensor section and either the first terminal or the second terminal. The control unit comprises an input section into which the signal is input, an output section which is a path for outputting output information to other devices, and an isolation section provided in the signal path between the input section and the output section. The insulating part transmits a temperature signal based on the temperature information to the transmission path while insulating the input path from the input unit side and the transmission path to the other device side in the signal path.

2. A switch provided between a first power line and a second power line in a power line that supplies power to a power supply target, A temperature sensor unit that outputs a signal capable of specifying the temperature of the switch, The system comprises a control unit that processes temperature information based on the signal output from the temperature sensor unit, The switch has a first terminal electrically connected to the first power line and a second terminal electrically connected to the second power line, and switches between an allow state that permits energization through the switch between the first terminal and the second terminal and an interrupted state that interrupts energization through the switch. Furthermore, the device includes a current-carrying section that conducts current between a part of the temperature sensor section and either the first terminal or the second terminal. The system includes an isolated power supply unit that generates an output voltage based on power from a second power supply unit, which is different from the power supply unit that supplies power to the aforementioned power supply target, The isolated power supply unit applies the output voltage to a predetermined conductive path while insulating the power supply unit from the second power supply unit. The temperature sensor unit is a temperature monitoring device in which a part of it is short-circuited to the power line, another part different from the part is short-circuited to the conductive line, and a signal is output while current flows between the part and the other part.

3. At least one of the first power line and the second power line has a busbar, The first terminal and the second terminal are electrically connected in a configuration in which either one is short-circuited to the busbar. The temperature monitoring device according to claim 1 or claim 2, wherein a portion of the temperature sensor unit is electrically connected to the busbar in a short-circuit configuration.

4. The temperature sensor unit has a thermistor having one terminal and another terminal, The temperature monitoring device according to claim 1 or claim 2, wherein the aforementioned terminal is short-circuited to either the first terminal or the second terminal.

5. The temperature sensor section has a voltage divider circuit section in which a resistor and a thermistor are connected in series. A predetermined voltage is applied between one end of the resistor and the other end of the thermistor in the voltage divider circuit. The one end or the other end is short-circuited to either the first terminal or the second terminal, The temperature monitoring device according to claim 1 or claim 2, wherein the voltage divider circuit outputs a voltage divider signal as the signal.

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