WO2022144586A1 - Module électrique à surveillance de température multizone - Google Patents

Module électrique à surveillance de température multizone Download PDF

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Publication number
WO2022144586A1
WO2022144586A1 PCT/IB2021/000859 IB2021000859W WO2022144586A1 WO 2022144586 A1 WO2022144586 A1 WO 2022144586A1 IB 2021000859 W IB2021000859 W IB 2021000859W WO 2022144586 A1 WO2022144586 A1 WO 2022144586A1
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WO
WIPO (PCT)
Prior art keywords
measuring
temperature
electrical assembly
electrical
resistors
Prior art date
Application number
PCT/IB2021/000859
Other languages
German (de)
English (en)
Inventor
Rüdiger SPILLNER
Original Assignee
Gentherm Medical Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102021000571.6A external-priority patent/DE102021000571A1/de
Application filed by Gentherm Medical Llc filed Critical Gentherm Medical Llc
Priority to US18/033,917 priority Critical patent/US20230400360A1/en
Publication of WO2022144586A1 publication Critical patent/WO2022144586A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/0097—Blankets with active heating or cooling sources
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/005—Circuits arrangements for indicating a predetermined temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
    • G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
    • G01K7/203—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit in an oscillator circuit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
    • G01K7/245—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit in an oscillator circuit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/34—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
    • A61F2007/0071—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating using a resistor, e.g. near the spot to be heated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F2007/0086—Heating or cooling appliances for medical or therapeutic treatment of the human body with a thermostat
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2213/00—Temperature mapping

Definitions

  • the invention relates to an electrical assembly with multi-zone temperature monitoring, comprising: a heat-generating electrical device, a measuring circuit with a plurality of temperature-dependent electrical measuring resistors, the measuring resistors being positioned in spaced-apart temperature measuring areas of the heat-generating electrical device, and an evaluation device which has a measuring channel for measuring measured values.
  • the invention relates to a heating device with an electrical assembly with multi-zone temperature monitoring.
  • the invention relates to a cell connector with an electrical assembly with multi-zone temperature monitoring.
  • thermoelectric components such as NTC thermistors or PTC thermistors or other thermocouples
  • each thermoelectric component has required its own wires, cables and connections.
  • the evaluation device used requires a number of measurement channels via which the signals from the thermoelectric components can be evaluated for temperature measurement. Overall, this leads to a comparatively high use of materials and a large space requirement with regard to packaging and installation space.
  • the known electrical assemblies for multi-zone temperature monitoring require comparatively complex assembly.
  • the object on which the invention is based is therefore to simplify the multi-zone temperature monitoring of electrical components.
  • the object is achieved by an electrical assembly of the type mentioned, the measuring resistors of the electrical assembly according to the invention via a common measuring line electrically conductive with the Measuring channel of the evaluation device are connected and the evaluation device is set up to determine a temperature and/or exceeding a temperature limit value in at least one of the temperature measuring ranges by evaluating the signal at the measuring channel.
  • the electrical assembly according to the invention enables temperature regulation or limitation in which only one measuring line is used despite the monitoring of a plurality of temperature measuring ranges. Despite the fact that there is only one measuring line, it is thus possible to monitor a large-area monitoring area using a plurality of measuring resistors.
  • a multi-zone temperature monitoring can thus be implemented with a comparatively simple electrical assembly, by means of which local temperature rises, so-called hotspots, on heat-generating electrical devices can be reliably detected.
  • the electrical assembly or its measuring circuit can be implemented, for example, as surface-mounted components (SMD components).
  • SMD components surface-mounted components
  • the electrical assembly also requires comparatively little space.
  • the assembly of the electrical assembly is comparatively simple, since separate wiring and separate measuring channels for the respective electrical measuring resistors can be dispensed with.
  • the electrical assembly can be used, for example, in connection with disposable items such as patient heaters.
  • the heat-generating electrical device can be a heating foil or heating blanket, in which the measuring circuit is integrated.
  • the evaluation device can be part of a control and/or regulating device.
  • the control and/or regulating device comprising the evaluation device can be provided for multiple use, for example, and can be connected to different heating foils and/or heating blankets.
  • the electrical assembly generally offers advantages wherever there are high integration or packaging requirements and/or a large number of similar ones sensors is required.
  • the electrical assembly according to the invention can also be used, for example, in connection with cell connection boards or cell sensor boards.
  • the measured value that can be detected by the evaluation device is the current flowing through the measuring channel and/or the voltage present at the measuring channel.
  • the evaluation device is set up to, via an evaluation of the current flowing through the measurement channel and/or the voltage applied to the measurement channel, a temperature and/or a temperature exceeding a limit value in at least one of the
  • the electrical resistance value of the measuring resistors changes non-linearly at least in one temperature range with respect to a temperature change in the respective temperature measuring ranges.
  • the measuring resistors have a conductivity anomaly in the range of a temperature limit value, which leads to a sudden change in the conductivity of the measuring resistors in this temperature range. If the measuring resistors heat up, the electrical resistance value of the measuring resistors can drop suddenly if the temperature limit is exceeded. When the measuring resistors cool down, the electrical resistance value of the measuring resistors can increase suddenly if the temperature falls below the limit value.
  • the measuring resistors are at least partially made of vanadium dioxide. If vanadium dioxide exceeds a temperature limit of approx. 68 degrees Celsius, the crystal structure of the vanadium dioxide changes. A rutile crystal structure is present in the metallic phase for temperatures above the temperature limit of 68 degrees Celsius, while the insulating or semiconducting phase has a monoclinic structure for temperatures below the temperature limit of 68 degrees Celsius having. During the phase transition, the electrical conductivity of the vanadium dioxide changes by a factor of 10 3 to 10 5 .
  • the measuring resistors and/or the measuring line are integrated into the heat-generating electrical device.
  • the measuring resistors and/or the measuring line are preferably electrically conductively connected to a voltage and/or current source of the heat-generating electrical device.
  • the heat-generating electrical device can be, for example, a heating device with a plurality of heating conductors or a plurality of heating conductor segments.
  • the heating conductors or heating conductor segments can be tracks on a heating foil.
  • the measuring resistors are preferably electrically conductively connected to the heating conductors or heating conductor segments.
  • the measuring resistors are preferably connected in parallel to the heating conductors or heating conductor segments.
  • the evaluation device is set up to determine the temperature or the exceeding of the temperature limit value in at least one of the temperature measuring ranges by detecting whether the measured value exceeds or falls below a threshold value at the measuring channel.
  • the resistance value of the measuring resistor arranged in this temperature measuring range decreases. A higher current will flow from the heat-generating electrical device via the measurement resistors to the measurement channel, or the potential will change accordingly.
  • the evaluation device can monitor when a current limit value is exceeded, with which the temperature limit value is then also detected.
  • an electrical assembly according to the invention is advantageous in which the measuring circuit is designed such that the measured value threshold at the measuring channel is higher than the maximum measured value at the measuring channel that can be caused by a temperature rise below the temperature limit value in all temperature measuring ranges.
  • the measuring circuit is designed in such a way that the measured value threshold at the measuring channel is lower than the minimum measured value at the measuring channel that can be caused by a temperature rise below the temperature limit value in all temperature measuring ranges.
  • the evaluation device is thus able to differentiate between a large change in the measured value on the measuring channel due to a temperature limit value being exceeded in a measuring range on the one hand and a large change in the measured value due to a flat temperature increase in several temperature measuring ranges below the temperature limit value.
  • the evaluation device is set up to determine whether the temperature limit value has been exceeded in at least one of the temperature measuring ranges by detecting a specific change over time in the measured value on the measuring channel.
  • the interference from the other measuring resistors, in whose temperature measuring ranges the temperature limit value has not been exceeded can also be greater than the change in the measured value, which results from a temperature limit value being exceeded in a temperature measuring range, since a time component is now taken into account.
  • the evaluation device is set up to use the magnitude of the measured value change on the measuring channel to identify the temperature measuring range at which the temperature limit value has been exceeded.
  • the measuring resistors are connected to electrical conductors of different lengths of the heat-generating electrical device.
  • the electrical conductors of the heat-generating electrical device can be heating conductors or heating conductor segments, for example. As the length of the electrical conductors increases, their electrical resistance increases. Thus, the current rises and the voltage drops across the various measuring resistors differ in their level, depending on where these resistors are located or how long the electrical conductor is to which they are connected. This effect occurs because the current is routed to the various sense resistors of different lengths must flow through before it can branch off in front of the respective measuring resistor.
  • the heat-generating electrical device and the measuring circuit are connected to the same ground.
  • the heat-generating electrical device and the measuring circuit are connected to different grounds. Both connection variants can offer metrological advantages, so that a suitable ground connection must be selected depending on the intended use of the electrical assembly.
  • the leads of the respective measuring resistors have different capacitive properties and/or different inductive properties.
  • the evaluation device is preferably set up to assign at least one determined temperature and/or at least one determined temperature limit violation to a measuring resistor based on the differing capacitive properties and/or the differing inductive properties of the leads of the respective measuring resistors.
  • the individual properties of the supply lines change their frequency-dependent complex resistance, i.e. their impedance, and also their oscillation behavior (RC, RCL).
  • the respective measuring resistor is used to record the temperature, with the evaluation device being able to detect via the differing capacitive properties and/or the differing inductive properties of the leads of the respective measuring resistors, which measuring resistor is responsible for the change in the measured value at the measuring channel, so that the associated temperature measuring range can be determined.
  • the measuring resistors can also be thermistors or PTC thermistors, the electrical resistance of which changes linearly with a temperature change in the respective temperature measuring ranges.
  • the evaluation device has an integrated circuit which is set up to check the frequency-dependent total resistance, the oscillation behavior and/or the impulse response at the measuring channel.
  • the evaluation device is preferably set up to check only a few defined frequency ranges. This keeps the costs for the switching technology low.
  • the integrated circuit can be set up to carry out an impedance spectroscopy.
  • the integrated circuit can take the measurement on a parallel test lead.
  • the potential of the heat-generating electrical device can be switched, isolated or brought to a defined level for the measurement. A high level of power is therefore briefly disconnected from the measuring circuit.
  • the capacitive properties of the respective supply line are caused by capacitive components in the supply line or by the structure of the conductor material of the respective supply line.
  • the inductive properties of the respective supply line are caused by inductive components in the supply line or by the structure of the conductor material of the respective supply line.
  • the structure of the conductor material can be a foil with conductive tracks to provide capacitive properties, the tracks interlocking in parallel and thus forming many small capacitors. The advantage of such an arrangement is that it can be easily produced on the surface.
  • the structure of the conductor material can also include a fold or fold, in which two electrically conductive surfaces, between which an insulating intermediate material or a dielectric is present, are arranged at a distance from one another in such a way that they form a kind of
  • the base capacitance and resistance of an oscillating circuit can be adjusted by the design of a foil circuit, for example the length of the circuit or the length and/or spacing of parallel circuits.
  • a second sheet or flaps with half cutouts are used, a second layer may be applied to the base sheet to provide a to produce a second capacitor plate. Further capacitor plates can be produced by applying further layers.
  • an electrical assembly according to the invention is advantageous in which the supply lines of the respective measuring resistors have temperature-dependent capacitances and/or temperature-dependent inductances that differ from one another.
  • the evaluation device it is possible for the evaluation device to assign a determined temperature or a determined temperature limit value exceeding to a temperature measurement range.
  • the heat-generating electrical device is an electric heating blanket or heating foil with a plurality of heating conductors or heating conductor segments.
  • the heating conductors or heating conductor segments can be conductor tracks of the heating blanket or heating foil.
  • the conductor tracks can be applied to a carrier layer of the heating blanket or heating foil.
  • the object on which the invention is based is also achieved by a heating device of the type mentioned at the outset, the electrical assembly of the heating device according to the invention being designed according to one of the above embodiments.
  • the advantages and modifications of the heating device according to the invention reference is first made to the advantages and modifications of the electrical assembly.
  • the heat-generating device of the heating device is preferably a heating blanket or heating foil.
  • the heating blanket can be a personal heating blanket, which can be used to cover a person from above or as a base for heating a person from below.
  • Corresponding heating blankets can be used on operating tables, for example.
  • corresponding heating blankets are also used in outdoor rescue operations to protect unconscious or injured people from hypothermia.
  • Appropriate electric blankets can also be used as a sterile separating layer in appropriate rescue operations to protect people from a protect against contact with contaminated soil.
  • the heating blanket of the heating device can be a foil heater. In this case, for example, the heating blanket is designed as a cost-effective disposable product to ensure a sterile environment and prevent disinfection due to multiple use.
  • the evaluation device is preferably part of a control and/or regulating device, by means of which multi-zone temperature monitoring and/or heating output monitoring and preferably heating output control and/or heating output regulation is implemented.
  • the control and/or regulating device is usually a more complex electronic product, so that the control and/or regulating device can be separated from the heat-generating device, in particular from the disposable heating blanket, for multiple use.
  • FIG. 1 shows an exemplary embodiment of a heating device according to the invention in a schematic representation
  • Fig. 2 shows another embodiment of the invention
  • Heating device in a schematic representation
  • Fig. 3 shows another embodiment of the invention
  • Heating device in a schematic representation shows a further exemplary embodiment of the heating device according to the invention in a schematic representation;
  • 5 shows a non-linear, temperature-dependent conductivity behavior of a resistor
  • 6 shows a linear, temperature-dependent conductivity behavior of a resistor
  • FIG. 8 shows a conductor track structure of a heat-generating electrical device of an assembly according to the invention.
  • FIG. 9 shows a fold-over in the conductor track structure of a heat-generating electrical device of an assembly according to the invention.
  • 1 to 4 show different heating devices 100, each of which has an electronic assembly 10 with multi-zone temperature monitoring.
  • the electrical assembly 10 includes a heat-generating electrical device 12, which is designed as a heating blanket.
  • the heat-generating electrical device 12 designed as a heating blanket comprises a plurality of electrical conductors 14 which are applied to a carrier layer 16 .
  • the electrical conductors 14 are heating conductors, which heat up when current is applied.
  • the assembly 10 includes a measuring circuit 18 which is integrated into the heating blanket 12 .
  • the measuring circuit 18 comprises a plurality of temperature-dependent electrical measuring resistors 20a-20h, the measuring resistors 20a-20h being positioned in the heating blanket 12 in temperature measuring regions 22a-22h which are spaced apart from one another.
  • the electrical resistance value R of the measuring resistors 22a-22h changes in a temperature range non-linearly to the temperature change in the respective temperature measurement range 22a-22h.
  • the measurement resistors 22a-22h are formed at least partially from vanadium dioxide.
  • the measurement resistors 22a-22h are electrically conductively connected to a measurement channel 26 of an evaluation device 28 via a common measurement line 24 .
  • the measuring resistors 22a-22h and the measuring line 24 are electrically conductively connected to a voltage source 30, to which the heating conductors 14 of the heating blanket 12 are also connected.
  • the measuring resistors 22a-22h are connected in parallel to the heating conductors 14.
  • the heating blanket 12 and the measuring circuit 18 are connected to the same ground 32 .
  • the evaluation device 28 is set up to determine whether the temperature limit value has been exceeded in one of the temperature measurement ranges 22a-22h by evaluating the signal on the measurement channel 26 .
  • the measured value that can be detected by the evaluation device 28 can be the current flowing through the measuring channel 26 and/or the voltage present at the measuring channel 26 .
  • the crystal structure of the vanadium dioxide changes.
  • the electrical conductivity of the vanadium dioxide changes suddenly by a factor of 10 3 to 10 5 , so that the evaluation device 28 can determine whether the temperature limit value has been exceeded in a temperature measuring range 22a-22h by detecting that a current threshold value has been exceeded at the measuring channel 26. If the temperature T in one of the temperature measuring ranges 22a-22h rises above the temperature limit value TG, the resistance value R of the measuring resistor 20a-20h arranged in this temperature range 22a-22h drops suddenly. A higher current will flow from the heat-generating electrical device 12 via the measuring resistors 20a-20h to the measuring channel 26, so that the Evaluation device 28 can monitor the exceeding of a current limit for detecting a temperature limit violation.
  • the heat-generating electrical device 12 and the measuring circuit 18 are connected to different grounds 32, 34. Depending on the application, this can bring metrological advantages.
  • the leads 36a-36h of the respective measuring resistors 20a-20h have capacitive properties that differ from one another.
  • the evaluation device 28 is set up to assign a determined temperature or a determined temperature limit value exceeding to a measuring resistor 20a-20h and thus also to a temperature measuring range 22a-22h due to the different capacitive properties of the leads 36a-36h of the respective measuring resistors 20a-20h.
  • the capacitive properties of the respective feed line 36a-36h are caused by capacitive components 38a-38l in the feed line 36a-36h.
  • the individual capacitive properties of the leads 36a-36h each change their frequency-dependent complex resistance and thus also the oscillation behavior.
  • the respective measuring resistor 20a-20h is used to record the temperature T in the temperature measuring range 22a-22h assigned to the respective measuring resistor 20a-20h.
  • the evaluation device 28 can then use the differing capacitive properties of the supply lines 36a-36h to detect which measuring resistor 20a-20h is responsible for the change in the measured value at the measuring channel 26, so that the associated temperature measuring range 22a-22h can be determined.
  • the evaluation device 28 has an integrated circuit 40, by means of which the frequency-dependent total resistance, the oscillation behavior and the impulse response at the measuring channel 26 can be checked.
  • FIG. 4 shows an exemplary embodiment in which the integrated circuit 40 carries out the measurement via a switchable measurement channel 26 .
  • FIG. 5 shows the dependency of the resistance value R of a vanadium dioxide measuring resistor 20 on the temperature T.
  • a temperature limit value TG a sudden change in conductivity occurs.
  • the temperature limit TG for vanadium dioxide resistors 20 is approximately 68 degrees C. At this temperature, a phase transition from a monoclinic to a rutile crystal structure takes place.
  • Corresponding vanadium dioxide measurement resistors 20 with a conductivity anomaly in the range of 68 degrees Celsius can be used, for example, in the measurement circuits 18 of the embodiments illustrated in FIGS.
  • FIGS. 6 and 7 show the conductivity behavior of measuring resistors 20', 20", the characteristic curves of these measuring resistors 20', 20" not showing any abrupt changes in conductivity.
  • FIG. 6 relates to a thermistor which conducts better at high temperatures than at low temperatures.
  • FIG. 7 relates to a PTC thermistor which conducts better at low temperatures than at high temperatures.
  • FIG. 8 shows an example of a possibility of introducing capacitive properties through a structure 42a of the conductor material.
  • conductive tracks of a heating foil form the conductor material, with a number of conductive tracks 44 interlocking in parallel, so that a number of small capacitors are produced by the conductor structure 42a.
  • Such a structure 42a can be used, for example, in a supply line 36a-36h to a measuring resistor 20a-20h (cf. FIG. 4).
  • FIG. 9 shows the production of a conductor track structure 42b, which provides a plate capacitor by folding over or folding electrically conductive surfaces 46a, 46b. Insulating intermediate material or a dielectric is located between the surfaces 46a, 46b. The surfaces 46a, 46b are spaced apart from one another after folding, so that there is an air gap between the surfaces 46a, 46b. reference sign

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
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  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

L'invention concerne un module électrique (10) à surveillance de température multizone, comprenant : un dispositif électrique produisant de la chaleur (12), un circuit de mesure (18) comprenant plusieurs résistances de mesure (20, 20', 20'', 20a-20h) électriques dépendant de la température, les résistances de mesure (20, 20', 20'', 20a-20h) étant positionnées dans des zones de mesure de température (22a-22h) du dispositif électrique produisant de la chaleur (12) qui sont espacées les unes des autres, ainsi qu'un dispositif d'évaluation (28) qui présente un canal de mesure (26) pour détecter des valeurs de mesure, les résistances de mesure (20, 20', 20'', 20a-20h) étant reliées de manière électroconductrice au canal de mesure (26) du dispositif d'évaluation (28) par l'intermédiaire d'une ligne de mesure commune (24) et le dispositif d'évaluation (28) étant conçu pour déterminer, par une évaluation du signal au niveau du canal de mesure (26), une température et/ou un dépassement de valeur limite de température dans au moins une des zones de mesure de température (22a-22h).
PCT/IB2021/000859 2020-12-31 2021-12-07 Module électrique à surveillance de température multizone WO2022144586A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US18/033,917 US20230400360A1 (en) 2020-12-31 2021-12-07 Electrical assembly with multi-zone temperature monitoring

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102020007924.5 2020-12-31
DE102020007924 2020-12-31
DE102021000571.6A DE102021000571A1 (de) 2020-12-31 2021-02-04 Elektrische Baugruppe mit Mehrzonentemperaturüberwachung
DE102021000571.6 2021-02-04

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WO2022144586A1 true WO2022144586A1 (fr) 2022-07-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070180902A1 (en) * 2006-01-23 2007-08-09 Sherwood Engineering Design Services, Inc. Method and apparatus for measuring physical parameters
US20090315724A1 (en) * 2006-06-02 2009-12-24 Electronics And Telecommunications Research Institute Programmable mit sensor using the abrupt mit device, and alarm apparatus and secondary battery anti-explosion circuit including the mit sensor
DE102010018037A1 (de) * 2010-04-23 2011-10-27 Würth Elektronik Ics Gmbh & Co. Kg Temperaturüberwachungssystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070180902A1 (en) * 2006-01-23 2007-08-09 Sherwood Engineering Design Services, Inc. Method and apparatus for measuring physical parameters
US20090315724A1 (en) * 2006-06-02 2009-12-24 Electronics And Telecommunications Research Institute Programmable mit sensor using the abrupt mit device, and alarm apparatus and secondary battery anti-explosion circuit including the mit sensor
DE102010018037A1 (de) * 2010-04-23 2011-10-27 Würth Elektronik Ics Gmbh & Co. Kg Temperaturüberwachungssystem

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