WO2009000646A1 - Measuring sensor for use with a power electronics unit - Google Patents
Measuring sensor for use with a power electronics unit Download PDFInfo
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- WO2009000646A1 WO2009000646A1 PCT/EP2008/057259 EP2008057259W WO2009000646A1 WO 2009000646 A1 WO2009000646 A1 WO 2009000646A1 EP 2008057259 W EP2008057259 W EP 2008057259W WO 2009000646 A1 WO2009000646 A1 WO 2009000646A1
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- power electronics
- sensor
- signal line
- overvoltage
- sensor element
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- 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
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
Definitions
- the invention relates to a measuring sensor, in particular a temperature sensor, for use in or in power electronics.
- a temperature sensor As part of power electronics, a temperature sensor is often provided which measures the temperature of the power electronics. The detected by the temperature sensor measurement signal is evaluated in a downstream signal electronics with the aim to avoid overheating of the power electronics.
- power electronics modules e.g. used in an electric inverter for a hybrid drive, with integrated temperature sensor.
- a similar problem also exists for measuring sensors for detecting further measured variables, provided that these are used in or in a power electronics or any other environment in which high electrical voltages occur.
- a galvanic isolating distance is interposed between the measuring sensor and the signal electronics, via which the measuring signal detected by the measuring probe is transmitted nonelectrically, for example by optical or magnetic transmission mechanisms.
- the realization of a galvanic isolation path is comparatively complicated.
- the sensor can be encapsulated by the power electronics by a sufficient electrical insulation layer, in particular be arranged outside of a power electronics module.
- such an insulating layer regularly impedes the heat flow between the power electronics and the temperature sensor, so that an electrically encapsulated temperature sensor can detect the actual temperature of the power electronics only comparatively imprecisely.
- the invention has for its object to provide a sensor which can be realized by simple means and which can be used without risk to persons or a downstream signal electronics advantageous in the field of power electronics.
- the senor comprises a sensor element for detecting a measurement signal, which is wired via at least one electrical signal line to a signal output, which is connectable to a downstream signal electronics.
- the signal line is connected via an overvoltage bypass to ground.
- the overvoltage bypass has the property that it electrically blocks during normal operation of the measuring sensor, ie that no current flow between the signal line and ground is permitted, but opens in the signal line in the event of an overvoltage, ie the signal line shorts to ground.
- the signal line is still a fuse, in particular a Fuse, arranged, which is interposed between the sensor element and the overvoltage bypass.
- the combination of the overvoltage bypass with the upstream fuse has the effect that, in the event of a voltage flashover from the power electronics to the sensor element, the latter is conductively connected to ground by the overvoltage bypass.
- the opening of the overvoltage bypass limits the electrical voltage prevailing in the signal line to a harmless amount.
- the fuse is triggered by the short-circuit current flowing in the rollover case in the signal line and the overvoltage bypass and thus the sensor element from the signal output - and thus also from a downstream signal electronics - galvanically isolated.
- the construction of a dangerous voltage in the signal electronics or other, the sensor element downstream touchable parts is thus excluded.
- the overvoltage protection formed by the combination of the overvoltage bypass with the upstream fuse is simple and inexpensive to implement, in particular in comparison to a galvanic isolating distance. On the other hand, it allows the sensor element of the measuring sensor to be arranged without danger in the immediate surroundings of the power electronics and thus enables a precise measurement of the measured variable ascertained by the measuring sensor.
- the sensor is in particular a temperature sensor.
- the sensor element is a temperature sensor, in particular in the form of a thermocouple or another temperature-sensitive electrical or electronic component.
- the measuring sensor comprises two or more signal lines connected to the sensor element or a signal line which extends between the sensor element and the signal output branched.
- an overvoltage bypass as well as a fuse upstream of this is provided in each signal line or each branch of the signal line.
- the overvoltage bypass is simpler and more convenient
- Embodiment of the probe formed in particular by a Zener diode which is interposed in the reverse direction of the signal line and ground and thus limits the voltage applied in the signal line voltage to the value of the breakdown voltage of the Zener diode.
- a measuring amplifier connected downstream of the sensor element is provided in the signal line.
- the overvoltage bypass is preferably interposed between the sensor element and the measuring amplifier in order to operate in the
- the measuring sensor is designed as an independent component, which is initially produced independently of the power electronics and is arranged in accordance with its intended purpose only in a final assembly state in or on the latter.
- the sensor is fully or partially integrated into the power electronics. This embodiment is particularly advantageous when the power electronics is present as encapsulated, integrated electronic module.
- only the sensor element or only the sensor element and the or each fuse are preferably integrated into the power electronics, while the remaining components of the measuring sensor, in particular an optionally present measuring amplifier, are arranged externally in a separate plug-in component of the power electronics module.
- the only roughly schematic power electronics module comprises a power electronics 2 (only indicated by a dashed line in the illustration).
- the power electronics 2 are, in particular, a part of an electrical converter, for example one or more power switches each having a freewheeling diode connected in parallel (not shown in detail).
- the power electronics module 1 further comprises, by way of example, an electrical lead 3 for supplying an electrical supply current to the power electronics 2 and an electrical lead 4 for connecting the power electronics 2 to a downstream electrical or electronic component, for example an electric motor of a motor vehicle hybrid drive.
- the power electronics 2 is further provided with a ground terminal 5, which is electrically contacted with the mass M during operation of the power electronics module 1.
- the power electronics 2 are typically electrical conditions in the region of the same, which represent a considerable hazard for the human organism.
- the power electronics 2 are therefore enclosed in an insulating housing 6 and thus encapsulated so as to be touch-proof to the outside.
- the power electronics module 1 further comprises a power sensor 2 associated and integrated in the procedureelekt- ronikmodul 1 temperature sensor 10th
- the temperature sensor 10 comprises a sensor element 11 in the form of a temperature sensor.
- the sensor element 11 is electrically wired via a signal line 12 to a signal output 13 arranged in the wall of the insulating housing 6.
- the sensor element 11 is for this purpose via two parallel branches 14a, 14b of the signal line 12 with a downstream Measuring amplifier 15 interconnected.
- the measuring amplifier 15 is in turn connected on the output side to the signal output 13.
- a fuse 16a, 16b is arranged in each branch 14a, 14b of the signal line 12. Downstream of this fuse 16a or 16b branches off from each branch 14a, 14b an overvoltage bypass 17a, 17b which connects the respective overvoltage bypass 17a, 17b to ground M via a reverse-connected zener diode 18a, 18b.
- a signal electronics 19 is connected to the signal output 13 of the power electronics module 1 as intended, which is fed to a detected by the sensor element 11 and amplified in the measuring amplifier 15 temperature signal T.
- the signal electronics 19 compares the value of the temperature signal T with a stored threshold value. If the signal electronics 19 determines that the value of the temperature signal T exceeds the threshold value, then it initiates predetermined measures to protect the power electronics 2 from overheating. In normal operation, the Zener diodes 18a, 18b separate the signal line 12 from ground.
- the voltage in at least one, but typically in both paths 14a, 14b, of the signal line 12 increases to an amount which causes the breakdown.
- voltage of the respective associated zener diode 18a and 18b exceeds.
- the respective Zener diode 18a, 18b opens and discharges the short-circuit current flowing in the signal line 12 via the ground connection 5 to ground M.
- the associated fuse 16a or 16b burns through and thus separates the sensor element 11 galvanically from the measuring amplifier 1 and the downstream signal output 13. The risk of damage to the measuring Stronger 15 and the downstream signal electronics 19 or endangerment of persons is thereby excluded.
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Abstract
Description
Beschreibungdescription
Messfühler zum Einsatz bei einer LeistungselektronikSensor for use with power electronics
Die Erfindung bezieht sich auf einen Messfühler, insbesondere einen Temperaturfühler, zum Einsatz in oder bei einer Leistungselektronik.The invention relates to a measuring sensor, in particular a temperature sensor, for use in or in power electronics.
Im Rahmen einer Leistungselektronik ist häufig ein Tempera- turfühler vorgesehen, der die Temperatur der Leistungselektronik misst. Das von dem Temperaturfühler erfasste Messsignal wird in einer nachgeschalteten Signalelektronik mit dem Ziel ausgewertet, eine Überhitzung der Leistungselektronik zu vermeiden. Insbesondere in der Automobiltechnik werden häufig Leistungselektronikmodule, z.B. in einem elektrischen Umrichter für einen Hybridantrieb, mit integriertem Temperaturfühler eingesetzt.As part of power electronics, a temperature sensor is often provided which measures the temperature of the power electronics. The detected by the temperature sensor measurement signal is evaluated in a downstream signal electronics with the aim to avoid overheating of the power electronics. Particularly in automotive engineering, power electronics modules, e.g. used in an electric inverter for a hybrid drive, with integrated temperature sensor.
Bei einem Lichtbogenfehler in der Leistungselektronik, z.B. beim Ausfall eines Leistungsschalters, besteht eine gewisse Gefahr, dass der Lichtbogen auf den der Leistungselektronik zugeordneten Temperaturfühler überspringt. In diesem Fall kann eine gefährliche elektrische Spannung zur Signalelektronik gelangen. Hierdurch kann es einerseits zu einer Beschädi- gung oder Zerstörung der Signalelektronik kommen. Andererseits ist eine solche Signalelektronik - da sie im Normalbetrieb lediglich mit ungefährlicher Niederspannung arbeitet, nicht oder nur schwach elektrisch isoliert, so dass bei einem Spannungsüberschlag von der Leistungselektronik auf die Sig- nalelektronik unter Umständen eine Gefahr für Personen besteht .For an arcing fault in the power electronics, e.g. in the event of failure of a circuit breaker, there is a certain risk that the arc skips to the temperature sensor associated with the power electronics. In this case, a dangerous electrical voltage can reach the signal electronics. On the one hand, this can lead to damage or destruction of the signal electronics. On the other hand, such a signal electronics - since they only work with safe low voltage in normal operation, not or only weakly electrically isolated, so that when a voltage flashover of the power electronics on the sig- nal electronics under certain circumstances there is a risk to persons.
Eine ähnliche Problematik besteht grundsätzlich auch für Messfühler zur Erfassung weiterer Messgrößen, sofern diese in oder bei einer Leistungselektronik oder einer sonstigen Umgebung, in der hohe elektrische Spannungen auftreten, eingesetzt werden. Um einen Spannungsüberschlag von der Leistungselektronik auf die Signalelektronik auszuschließen, wird bisweilen dem Messfühler und der Signalelektronik eine galvanische Trennstrecke zwischengeschaltet, über welche das von dem Messfühler er- fasste Messsignal auf nicht-elektrischem Wege, beispielsweise durch optische oder magnetische Übertragungsmechanismen übertragen wird. Die Realisierung einer galvanischen Trennstrecke ist aber vergleichsweise aufwändig. Alternativ hierzu kann der Messfühler von der Leistungselektronik auch durch eine hinreichende elektrische Isolationsschicht abgekapselt, insbesondere außerhalb eines Leistungselektronikmoduls angeordnet sein. Eine solche Isolationsschicht behindert regelmäßig aber auch den Wärmefluss zwischen der Leistungselektronik und dem Temperaturfühler, so dass ein elektrisch abgekapselter Temperaturfühler die tatsächliche Temperatur der Leistungselektronik nur vergleichsweise unpräzise erfassen kann.In principle, a similar problem also exists for measuring sensors for detecting further measured variables, provided that these are used in or in a power electronics or any other environment in which high electrical voltages occur. In order to exclude a voltage flashover from the power electronics to the signal electronics, sometimes a galvanic isolating distance is interposed between the measuring sensor and the signal electronics, via which the measuring signal detected by the measuring probe is transmitted nonelectrically, for example by optical or magnetic transmission mechanisms. However, the realization of a galvanic isolation path is comparatively complicated. Alternatively, the sensor can be encapsulated by the power electronics by a sufficient electrical insulation layer, in particular be arranged outside of a power electronics module. However, such an insulating layer regularly impedes the heat flow between the power electronics and the temperature sensor, so that an electrically encapsulated temperature sensor can detect the actual temperature of the power electronics only comparatively imprecisely.
Der Erfindung liegt die Aufgabe zugrunde, einen Messfühler anzugeben, der mit einfachen Mitteln realisierbar ist und der ohne Gefährdung von Personen oder einer nachgeschalteten Signalelektronik vorteilhaft im Bereich einer Leistungselektronik einsetzbar ist.The invention has for its object to provide a sensor which can be realized by simple means and which can be used without risk to persons or a downstream signal electronics advantageous in the field of power electronics.
Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Anspruchs 1. Danach umfasst der Messfühler ein Sensorelement zur Erfassung eines Messsignals, das über mindestens eine elektrische Signalleitung mit einem Signalausgang verdrahtet ist, der an eine nachgeschaltete Signalelektronik anschließbar ist. Um im Falle eines Lichtbogenüberschlags auf das Sensorelement eine Gefährdung von Personen oder der nachgeschalteten Signalelektronik zu vermeiden, ist die Signalleitung über einen Überspannungsbypass mit Masse verbunden. Der Überspannungsbypass hat hierbei die Eigenschaft, dass er im Normalbetrieb des Messfühlers elektrisch sperrt, d.h. kei- nen Stromfluss zwischen der Signalleitung und Masse zulässt, aber im Falle einer Überspannung in der Signalleitung öffnet, d.h. die Signalleitung mit Masse kurzschließt. In der Signalleitung ist weiterhin eine Sicherung, insbesondere eine Schmelzsicherung, angeordnet, die dem Sensorelement und dem Überspannungsbypass zwischengeschaltet ist.This object is achieved by the features of claim 1. Thereafter, the sensor comprises a sensor element for detecting a measurement signal, which is wired via at least one electrical signal line to a signal output, which is connectable to a downstream signal electronics. In order to avoid a risk to persons or the downstream signal electronics in the event of arcing on the sensor element, the signal line is connected via an overvoltage bypass to ground. In this case, the overvoltage bypass has the property that it electrically blocks during normal operation of the measuring sensor, ie that no current flow between the signal line and ground is permitted, but opens in the signal line in the event of an overvoltage, ie the signal line shorts to ground. In the signal line is still a fuse, in particular a Fuse, arranged, which is interposed between the sensor element and the overvoltage bypass.
Die Kombination des Überspannungsbypasses mit der vorgeschal- teten Sicherung bewirkt, dass bei einem Spannungsüberschlag von der Leistungselektronik auf das Sensorelement das letztere durch den Überspannungsbypass leitend mit Masse verbunden wird. Durch die Öffnung des Überspannungsbypasses wird somit einerseits die in der Signalleitung herrschende elekt- rische Spannung auf einen ungefährlichen Betrag limitiert.The combination of the overvoltage bypass with the upstream fuse has the effect that, in the event of a voltage flashover from the power electronics to the sensor element, the latter is conductively connected to ground by the overvoltage bypass. On the one hand, the opening of the overvoltage bypass limits the electrical voltage prevailing in the signal line to a harmless amount.
Andererseits wird durch den im Überschlagsfall in der Signalleitung und dem Überspannungsbypass fließenden Kurzschlussstrom die Sicherung ausgelöst und somit das Sensorelement von dem Signalausgang - und damit auch von einer nachgeschalteten Signalelektronik - galvanisch getrennt. Der Aufbau einer gefährlichen Spannung in der Signalelektronik oder sonstigen, dem Sensorelement nachgeschalteten berührbaren Teilen ist somit ausgeschlossen.On the other hand, the fuse is triggered by the short-circuit current flowing in the rollover case in the signal line and the overvoltage bypass and thus the sensor element from the signal output - and thus also from a downstream signal electronics - galvanically isolated. The construction of a dangerous voltage in the signal electronics or other, the sensor element downstream touchable parts is thus excluded.
Der durch die Kombination des Überspannungsbypasses mit der vorgeschalteten Sicherung gebildete Überspannungsschutz ist dabei - insbesondere im Vergleich zu einer galvanischen Trennstrecke - einfach und preisgünstig realisierbar. Er erlaubt es andererseits, das Sensorelement des Messfühlers ge- fahrlos in der unmittelbaren Umgebung der Leistungselektronik anzuordnen und ermöglicht somit eine präzise Messung der von dem Messfühler erhobenen Messgröße.The overvoltage protection formed by the combination of the overvoltage bypass with the upstream fuse is simple and inexpensive to implement, in particular in comparison to a galvanic isolating distance. On the other hand, it allows the sensor element of the measuring sensor to be arranged without danger in the immediate surroundings of the power electronics and thus enables a precise measurement of the measured variable ascertained by the measuring sensor.
Bei dem Messfühler handelt es sich insbesondere um einen Tem- peraturfühler . In diesem Fall handelt es sich bei dem Sensorelement um einen Temperatursensor, insbesondere in Form eines Thermoelements oder eines sonstigen temperaturempfindlichen elektrischen oder elektronischen Bauteils.The sensor is in particular a temperature sensor. In this case, the sensor element is a temperature sensor, in particular in the form of a thermocouple or another temperature-sensitive electrical or electronic component.
Optional, insbesondere im Falle eines passiven Sensorelements, umfasst der Messfühler zwei oder mehr mit dem Sensorelement verbundene Signalleitungen oder eine Signalleitung, die sich zwischen dem Sensorelement und dem Signalausgang verzweigt. In diesem Fall ist in jeder Signalleitung bzw. jedem Zweig der Signalleitung ein Überspannungsbypass sowie eine diesem vorgeschaltete Sicherung vorgesehen.Optionally, in particular in the case of a passive sensor element, the measuring sensor comprises two or more signal lines connected to the sensor element or a signal line which extends between the sensor element and the signal output branched. In this case, an overvoltage bypass as well as a fuse upstream of this is provided in each signal line or each branch of the signal line.
Der Überspannungsbypass ist in einfacher und zweckmäßigerThe overvoltage bypass is simpler and more convenient
Ausführung des Messfühlers insbesondere durch eine Zenerdiode gebildet, die der Signalleitung und Masse in Sperrrichtung zwischengeschaltet ist und die somit die in der Signalleitung anliegende Spannung auf den Wert der Durchbruchspannung der Zenerdiode begrenzt.Embodiment of the probe formed in particular by a Zener diode, which is interposed in the reverse direction of the signal line and ground and thus limits the voltage applied in the signal line voltage to the value of the breakdown voltage of the Zener diode.
In vorteilhafter Ausführung ist in der Signalleitung ein dem Sensorelement nachgeschalteter Messverstärker vorgesehen. In diesem Fall ist der Überspannungsbypass dem Sensorelement und dem Messverstärker vorzugsweise zwischengeschaltet, um imIn an advantageous embodiment, a measuring amplifier connected downstream of the sensor element is provided in the signal line. In this case, the overvoltage bypass is preferably interposed between the sensor element and the measuring amplifier in order to operate in the
Falle eines Spannungsüberschlags eine Spannungsüberbelastung des Messverstärkers zu verhindern.If a voltage flashover occurs, prevent overvoltage of the measuring amplifier.
In einer zweckmäßigen Ausführung der Erfindung ist der Mess- fühler als eigenständiges Bauteil konzipiert, das zunächst unabhängig von der Leistungselektronik hergestellt und bestimmungsgemäß erst in einem Endmontagezustand in oder an der letzteren angeordnet wird. In einer bevorzugten alternativen Ausführung ist der Messfühler ganz oder teilweise in die Leistungselektronik integriert. Diese Ausführung ist insbesondere dann vorteilhaft, wenn die Leistungselektronik als gekapseltes, integriertes Elektronikmodul vorliegt. Bevorzugt sind insbesondere nur das Sensorelement oder nur das Sensorelement und die oder jede Sicherung in die Leistungselektro- nik integriert, während die restlichen Bestandteile des Messfühlers, insbesondere ein optional vorhandener Messverstärker, in einem separaten Aufsteckbauteil extern des Leistungselektronikmoduls angeordnet sind.In an expedient embodiment of the invention, the measuring sensor is designed as an independent component, which is initially produced independently of the power electronics and is arranged in accordance with its intended purpose only in a final assembly state in or on the latter. In a preferred alternative embodiment, the sensor is fully or partially integrated into the power electronics. This embodiment is particularly advantageous when the power electronics is present as encapsulated, integrated electronic module. In particular, only the sensor element or only the sensor element and the or each fuse are preferably integrated into the power electronics, while the remaining components of the measuring sensor, in particular an optionally present measuring amplifier, are arranged externally in a separate plug-in component of the power electronics module.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher beschrieben. Darin zeigt die einzige Figur ein Leistungselektronikmodul mit einem integrierten Temperaturfühler . Das lediglich grob schematisch Leistungselektronikmodul um- fasst eine (in der Darstellung lediglich mit einem gestrichelten Kreis angedeutete) Leistungselektronik 2. Bei der Leistungselektronik 2 handelt es sich insbesondere um einen Teil eines elektrischen Umrichters, beispielsweise um einen oder mehrere Leistungsschalter mit jeweils einer parallel geschalteten Freilaufdiode (nicht näher dargestellt) . Das Leistungselektronikmodul 1 umfasst weiterhin beispielhaft eine elektrische Zuleitung 3 zur Zuleitung eines elektrischen Versorgungsstroms an die Leistungselektronik 2 sowie eine elektrische Ableitung 4 zur Verbindung der Leistungselektronik 2 mit einem nachgeschalteten elektrischen oder elektronischen Bauteil, beispielsweise einem Elektromotor eines Kraftfahr- zeug-Hybridantriebs . Die Leistungselektronik 2 ist weiterhin mit einem Masseanschluss 5 versehen, der im Betrieb des Leistungselektronikmoduls 1 elektrisch mit Masse M kontaktiert ist .An embodiment of the invention will be described in more detail with reference to a drawing. In it, the only figure shows a power electronics module with an integrated temperature sensor. The only roughly schematic power electronics module comprises a power electronics 2 (only indicated by a dashed line in the illustration). The power electronics 2 are, in particular, a part of an electrical converter, for example one or more power switches each having a freewheeling diode connected in parallel (not shown in detail). The power electronics module 1 further comprises, by way of example, an electrical lead 3 for supplying an electrical supply current to the power electronics 2 and an electrical lead 4 for connecting the power electronics 2 to a downstream electrical or electronic component, for example an electric motor of a motor vehicle hybrid drive. The power electronics 2 is further provided with a ground terminal 5, which is electrically contacted with the mass M during operation of the power electronics module 1.
Im Betrieb der Leistungselektronik 2 herrschen im Bereich derselben typischerweise elektrische Bedingungen, die eine erhebliche Gefährdung für den menschlichen Organismus darstellen. Im Rahmen des Leistungselektronikmoduls 1 ist die Leistungselektronik 2 daher in einem Isoliergehäuse 6 einge- schlössen und somit nach außen hin berührungssicher gekapselt.During operation of the power electronics 2, there are typically electrical conditions in the region of the same, which represent a considerable hazard for the human organism. Within the scope of the power electronics module 1, the power electronics 2 are therefore enclosed in an insulating housing 6 and thus encapsulated so as to be touch-proof to the outside.
Das Leistungselektronikmodul 1 umfasst weiterhin einen der Leistungselektronik 2 zugeordneten und in das Leistungselekt- ronikmodul 1 integrierten Temperaturfühler 10.The power electronics module 1 further comprises a power sensor 2 associated and integrated in the Leistungselekt- ronikmodul 1 temperature sensor 10th
Der Temperaturfühler 10 umfasst ein Sensorelement 11 in Form eines Temperatursensors. Das Sensorelement 11 ist über eine Signalleitung 12 elektrisch mit einem in der Wand des Iso- liergehäuses 6 angeordneten Signalausgang 13 verdrahtet. Das Sensorelement 11 ist hierzu über zwei parallele Zweige 14a, 14b der Signalleitung 12 mit einem nachgeschalteten Messverstärker 15 verschaltet. Der Messverstärker 15 ist wiederum ausgangsseitig mit dem Signalausgang 13 verschaltet.The temperature sensor 10 comprises a sensor element 11 in the form of a temperature sensor. The sensor element 11 is electrically wired via a signal line 12 to a signal output 13 arranged in the wall of the insulating housing 6. The sensor element 11 is for this purpose via two parallel branches 14a, 14b of the signal line 12 with a downstream Measuring amplifier 15 interconnected. The measuring amplifier 15 is in turn connected on the output side to the signal output 13.
Ausgehend von dem Sensorelement 11 ist in jedem Zweig 14a, 14b der Signalleitung 12 eine Schmelzsicherung 16a, 16b angeordnet. Dieser Schmelzsicherung 16a bzw. 16b nachgeschaltet zweigt von jedem Zweig 14a, 14b ein Überspannungsbypass 17a, 17b ab, der den jeweiligen Überspannungsbypass 17a, 17b über eine in Sperrrichtung geschaltete Zenerdiode 18a, 18b mit Masse M verbindet.Starting from the sensor element 11, a fuse 16a, 16b is arranged in each branch 14a, 14b of the signal line 12. Downstream of this fuse 16a or 16b branches off from each branch 14a, 14b an overvoltage bypass 17a, 17b which connects the respective overvoltage bypass 17a, 17b to ground M via a reverse-connected zener diode 18a, 18b.
Im Montagezustand ist an den Signalausgang 13 des Leistungselektronikmoduls 1 bestimmungsgemäß eine Signalelektronik 19 angeschlossen, der ein von dem Sensorelement 11 erfasstes und im Messverstärker 15 verstärktes Temperatursignal T zugeführt wird. Die Signalelektronik 19 vergleicht hierbei den Wert des Temperatursignals T mit einem hinterlegten Schwellwert. Stellt die Signalelektronik 19 fest, dass der Wert das Temperatursignals T den Schwellwert überschreitet, so leitet sie vorgegebene Maßnahmen ein, um die Leistungselektronik 2 vor einer Überhitzung zu schützen. Im Normalbetrieb trennen die Zenerdioden 18a, 18b die Signalleitung 12 von Masse.In the assembled state a signal electronics 19 is connected to the signal output 13 of the power electronics module 1 as intended, which is fed to a detected by the sensor element 11 and amplified in the measuring amplifier 15 temperature signal T. The signal electronics 19 compares the value of the temperature signal T with a stored threshold value. If the signal electronics 19 determines that the value of the temperature signal T exceeds the threshold value, then it initiates predetermined measures to protect the power electronics 2 from overheating. In normal operation, the Zener diodes 18a, 18b separate the signal line 12 from ground.
Kommt es im Falle eines Lichtbogenfehlers in der Leistungs- elektronik 2 zu einem Überschlag des Lichtbogens auf den Temperatursensor 11 so steigt die elektrische Spannung in mindestens einem, typischerweise aber in beiden Pfaden 14a, 14b der Signalleitung 12 auf einen Betrag an, der die Durchbruch- spannung der jeweils zugeordneten Zenerdiode 18a bzw. 18b ü- bersteigt. Hierdurch öffnet die jeweilige Zenerdiode 18a, 18b und leitet den in der Signalleitung 12 aufgrund des Lichtbogenüberschlags fließenden Kurzschlussstrom über den Massean- schluss 5 an Masse M ab. Infolge des Kurzschlussstroms in dem jeweiligen Zweig 14a, 14b brennt die zugeordnete Schmelzsiche- rung 16a bzw. 16b durch und trennt somit das Sensorelement 11 galvanisch von dem Messverstärker 1 und dem nachgeschalteten Signalausgang 13. Die Gefahr einer Beschädigung des Messver- stärkers 15 und der nachgeschalteten Signalelektronik 19 oder eine Gefährdung von Personen wird hierdurch ausgeschlossen. If, in the event of an arcing fault in the power electronics 2, a flashover of the arc occurs on the temperature sensor 11, the voltage in at least one, but typically in both paths 14a, 14b, of the signal line 12 increases to an amount which causes the breakdown. voltage of the respective associated zener diode 18a and 18b exceeds. As a result, the respective Zener diode 18a, 18b opens and discharges the short-circuit current flowing in the signal line 12 via the ground connection 5 to ground M. As a result of the short-circuit current in the respective branch 14a, 14b, the associated fuse 16a or 16b burns through and thus separates the sensor element 11 galvanically from the measuring amplifier 1 and the downstream signal output 13. The risk of damage to the measuring Stronger 15 and the downstream signal electronics 19 or endangerment of persons is thereby excluded.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200710028929 DE102007028929B3 (en) | 2007-06-22 | 2007-06-22 | Sensor for use with power electronics |
| DE102007028929.6 | 2007-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009000646A1 true WO2009000646A1 (en) | 2008-12-31 |
Family
ID=39713439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/057259 Ceased WO2009000646A1 (en) | 2007-06-22 | 2008-06-11 | Measuring sensor for use with a power electronics unit |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102007028929B3 (en) |
| WO (1) | WO2009000646A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10332113B2 (en) * | 2014-11-19 | 2019-06-25 | Eyelock Llc | Model-based prediction of an optimal convenience metric for authorizing transactions |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6350580B2 (en) * | 2016-04-06 | 2018-07-04 | トヨタ自動車株式会社 | Temperature detection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1538376A1 (en) * | 1966-11-30 | 1969-07-24 | Bosch Elektronik Photokino | Protection circuit for the DC voltage supply of an electronic device |
| US20040194497A1 (en) * | 2003-04-03 | 2004-10-07 | Kaname Sasaki | Cooling system for motor and cooling control method |
| WO2005122354A1 (en) * | 2004-06-10 | 2005-12-22 | Abb Oy | Isolated measurement circuit for sensor resistance |
| DE102005006100A1 (en) * | 2005-02-10 | 2006-08-24 | Audi Ag | Protection circuit e.g. overvoltage protection circuit, for protecting electronic circuit arrangement in motor vehicle, has fuse unit and circuit formed such that separation of arrangement from power supply unit is accomplished |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004046275B4 (en) * | 2003-09-23 | 2006-12-21 | Saxotec Gmbh & Co.Kg | Device for monitoring the temperature of high-voltage assemblies |
| DE102004039601B3 (en) * | 2004-08-13 | 2006-07-13 | Intedis Gmbh & Co. Kg | Circuit arrangement for protecting a conductor element against overcurrent |
-
2007
- 2007-06-22 DE DE200710028929 patent/DE102007028929B3/en not_active Expired - Fee Related
-
2008
- 2008-06-11 WO PCT/EP2008/057259 patent/WO2009000646A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1538376A1 (en) * | 1966-11-30 | 1969-07-24 | Bosch Elektronik Photokino | Protection circuit for the DC voltage supply of an electronic device |
| US20040194497A1 (en) * | 2003-04-03 | 2004-10-07 | Kaname Sasaki | Cooling system for motor and cooling control method |
| WO2005122354A1 (en) * | 2004-06-10 | 2005-12-22 | Abb Oy | Isolated measurement circuit for sensor resistance |
| DE102005006100A1 (en) * | 2005-02-10 | 2006-08-24 | Audi Ag | Protection circuit e.g. overvoltage protection circuit, for protecting electronic circuit arrangement in motor vehicle, has fuse unit and circuit formed such that separation of arrangement from power supply unit is accomplished |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10332113B2 (en) * | 2014-11-19 | 2019-06-25 | Eyelock Llc | Model-based prediction of an optimal convenience metric for authorizing transactions |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007028929B3 (en) | 2008-09-25 |
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