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WO2000013031A1 - Electric circuit with device for detecting a current magnitude - Google Patents

Electric circuit with device for detecting a current magnitude Download PDF

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Publication number
WO2000013031A1
WO2000013031A1 PCT/DE1999/001248 DE9901248W WO0013031A1 WO 2000013031 A1 WO2000013031 A1 WO 2000013031A1 DE 9901248 W DE9901248 W DE 9901248W WO 0013031 A1 WO0013031 A1 WO 0013031A1
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WO
WIPO (PCT)
Prior art keywords
current
circuit according
line connection
electrical
lead frame
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/DE1999/001248
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German (de)
French (fr)
Inventor
Lothar Borho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2000013031A1 publication Critical patent/WO2000013031A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/44—Modifications of instruments for temperature compensation

Definitions

  • the invention is based on an electrical circuit in which individual electronic or electrical components are connected by at least one electrical line and with a device for detecting the current strength in the line.
  • Devices for detecting a current variable are known on the market, in which the voltage drop across the ohmic resistor is measured by means of a measuring resistor (shunt) in a current-carrying line and a current variable is determined therefrom.
  • the tapped voltage is usually fed to an electronic evaluation system.
  • the measuring resistors are consequently separate components of the electrical circuits.
  • the measuring resistor is plugged onto a printed circuit board as an SMD component.
  • Measuring resistors are also freely wired or bonded.
  • these measuring resistors represent additionally required components which take up space on a printed circuit board and also increase the material costs.
  • the device according to the invention with the characterizing features of the main claim has the advantage that a measuring resistor for detecting a current variable can be dispensed with, since an already existing line connection, in particular a lead frame connection, is used between two electrical components as a device for detecting a current variable.
  • This advantageously saves costs by dispensing with an electrical component and the associated space savings in an electronics housing and by simpler production.
  • the competitive advantage thus results from an inexpensive product price.
  • the printed circuit board that controls the control current of circuit breakers through the use of a lead frame in the load circuit. Since the high load current is conducted via the lead frame - instead of the conductor tracks of the printed circuit board as before - the cross-sectional area for the line can be reduced for smaller control currents. In the usual circuit board with several current-carrying circuit board layers, the number of these circuit board layers can therefore be reduced, for example from a four-layer to a two-layer circuit board. It is also advantageous that the circuit board size and thus the unit costs are reduced.
  • the lead frame has two connections for the electrical connection of the two electrical components, and preferably also two taps, between which a potential difference can be tapped via the measuring path of the lead frame and can be fed to an evaluation electronics.
  • Punched grids are line connections of a predetermined geometry punched out of a conductive sheet of a certain thickness for the power supply and discharge from and to the electrical components.
  • the connection ends provided for this purpose can be bent out of the plane of the sheet. For example, copper sheet or the like is used.
  • the two connections of the lead frame and taps for current measurement can be easily punched out of the sheet and are particularly easy to manufacture.
  • the geometrical shape of the lead frame depends on the one hand on the arrangement of the electrical / electronic components and the taps and on the other hand on the current strengths occurring in the load circuit and conducted in the lead frame.
  • FIG. 1 shows a schematic representation of the device according to the invention.
  • FIG. 1 shows a sketched electronic circuit 10, in which two arbitrary electrical or electronic components 12 are picked out and shown by way of example as consumers or switches.
  • the components 12 represent motor winding, capacitor, transistor, resistor, coil or the like.
  • One between the two components 12, for example by a battery Electrical potential difference U1 leads to a current I to be measured through the line connection of the lead frame 14, which is electrically connected to the components 12 via connections 16.
  • Two further taps 18 near the connections 16, or at a suitable other point, are provided in order to tap a voltage U between them and a voltage that operates practically without power
  • measuring resistance of the line connection between the taps 18 reproduces.
  • the measuring resistor is therefore no longer installed as a separate component, but the lead frame 14, that is to say the connection between two electrical components 12 themselves, is used as the measuring resistor.
  • the resistance R of the line connection must be determined with sufficient accuracy and compared with the magnitude of the currents I to be measured. For example, with a very small resistance R, large measuring currents I are required in order to obtain an evaluable measuring voltage U between the taps 18 at all.
  • the resistance R is preferably adjusted by extending the path of the line connection. When punching the lead frame or using a laser, cuts can subsequently be made in the line connection, which lead to a defined extension of the current path or to a cross-sectional narrowing and thus to an increase in resistance.
  • the measurement resistance R of the lead frame is determined and compared, for example, by means of an impressed test current I and in particular at a predetermined test temperature, provided that the lead frame material has a temperature-dependent resistance. If a material of the lead frame with a temperature-dependent resistance R is used, then correction values depending on the desired measurement accuracy and the desired temperature measurement range may also be necessary, which are advantageously stored in an EEPROM of a microcontroller of the control unit 10 integrated on the motor or by a circuit with analog and / or digital switching elements or components (eg ASIC) with which the measurement voltage U is corrected as a function of temperature.
  • the temperature in the lead frame area is advantageously measured by a temperature sensor.
  • the correction variables correct the influence of the temperature-dependent resistance R on the measuring voltage U, for example over a temperature range from -40 ° to + 125 ° C.
  • the undesired temperature drift of the resistance R of the lead frame can be prevented by using a lead frame material with a relatively temperature-independent ohmic resistance.
  • a lead frame material with a relatively temperature-independent ohmic resistance is suitable for this. Consequently, the subsequent correction of the values of the measurement voltage U obtained by the measurement using the correction variables is no longer absolutely necessary here.
  • the lead frame parts 14 are, for example, still extrusion-coated with plastic.
  • the individual line connections of the lead frame are thus spatially fixed.
  • the components 12 are connected to the bent connections 16 which protrude from the plastic.
  • lead frame 14, circuit board and components 12 are cast in or for protection against dust and other environmental influences enclosed in a housing, consisting of the plastic-coated lead frame and a cover.
  • the circuit 10 according to the invention is used, for example, in controls for adjusting drives for windows or sunroofs or for climate and air control in motor vehicles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention relates to an electric circuit comprising a device for detecting a current magnitude (I). Said device does not use a separate measuring resistor but an already existing pressed-screen connection as electric connection (14) between two components (12) of the electric circuit (10) itself. In this way, by avoiding the use of a separate component, saving space in an electronic housing and therefore simplifying manufacture, costs are cut in an advantageous manner.

Description

Elektrische Schaltung mit einer Vorrichtung zur Erfassung einer StromgrößeElectrical circuit with a device for detecting a current variable

Stand der TechnikState of the art

Die Erfindung geht aus von einer elektrischen Schaltung, bei der einzelne elektronische oder elektrische Bauteile durch mindestens eine elektrische Leitung verbunden sind und mit einer Vorrichtung zur Erfassung der Stromstärke in der Leitung.The invention is based on an electrical circuit in which individual electronic or electrical components are connected by at least one electrical line and with a device for detecting the current strength in the line.

Am Markt sind Vorrichtungen zur Erfassung einer Stromgröße bekannt, bei denen mittels eines Meßwiderstandes (Shunt) in einer stromführenden Leitung die an dem ohmschen Widerstand abfallende Spannung gemessen und daraus eine Stromgröße bestimmt wird. Dazu wird die abgegriffene Spannung üblicherweise einer Auswerteelektronik zugeführt. Die Meßwiderstände sind folglich separate Bauteile der elektrischen Schaltungen. Beispielsweise wird der Meßwiderstand als SMD-Bauteil auf eine Leiterplatte aufgesteckt. Ebenfalls werden Meßwiderstände frei verdrahtet oder gebondet . Nachteilig ist jedoch, daß diese Meßwiderstände zusätzlich benötigte Bauteile darstellen, die Raum auf einer Leiterplatte beanspruchen und darüber hinaus die Materialkosten erhöhen. Vorteile der ErfindungDevices for detecting a current variable are known on the market, in which the voltage drop across the ohmic resistor is measured by means of a measuring resistor (shunt) in a current-carrying line and a current variable is determined therefrom. For this purpose, the tapped voltage is usually fed to an electronic evaluation system. The measuring resistors are consequently separate components of the electrical circuits. For example, the measuring resistor is plugged onto a printed circuit board as an SMD component. Measuring resistors are also freely wired or bonded. However, it is disadvantageous that these measuring resistors represent additionally required components which take up space on a printed circuit board and also increase the material costs. Advantages of the invention

Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß auf einen Meßwiderstand zur Erfassung einer Stromgröße verzichtet werden kann, da eine bereits vorhandene Leitungsverbindung, insbesondere Stanzgitterverbindung, zwischen zwei elektrischen Bauteilen als Vorrichtung zur Erfassung einer Stromgröße verwendet wird. Damit werden vorteilhafterweise Kosten durch Verzicht auf ein elektrisches Bauteil und die damit verbundene Platzeinsparung in einem Elektronikgehäuse und durch eine einfachere Fertigung eingespart. Der Wettbewerbsvorteil ergibt sich somit durch einen kostengünstigen Produktpreis.The device according to the invention with the characterizing features of the main claim has the advantage that a measuring resistor for detecting a current variable can be dispensed with, since an already existing line connection, in particular a lead frame connection, is used between two electrical components as a device for detecting a current variable. This advantageously saves costs by dispensing with an electrical component and the associated space savings in an electronics housing and by simpler production. The competitive advantage thus results from an inexpensive product price.

Darüber hinaus ergeben sich weitere Vorteile für die den Steuerstrom von Leistungsschaltern leitende Leiterplatte durch die Verwendung eines Stanzgitters im Laststromkreis . Da der hohe Laststrom über das Stanzgitter - anstatt wie bisher über Leiterbahnen der Leiterplatte - geführt wird, kann die Leitungsquerschnittsfläche für die Leitung von kleineren Steuerströmen reduziert werden. Bei der üblichen Leiterplatte mit mehreren stromführenden Platinenlagen kann daher die Anzahl dieser Platinenlagen reduziert werden, beispielsweise von einer vierlagigen auf eine zweilagige Leiterplatte. Vorteilhaft ist weiterhin, daß die Leiterplattengröße und damit die Stückkosten verringert werden.In addition, there are further advantages for the printed circuit board that controls the control current of circuit breakers through the use of a lead frame in the load circuit. Since the high load current is conducted via the lead frame - instead of the conductor tracks of the printed circuit board as before - the cross-sectional area for the line can be reduced for smaller control currents. In the usual circuit board with several current-carrying circuit board layers, the number of these circuit board layers can therefore be reduced, for example from a four-layer to a two-layer circuit board. It is also advantageous that the circuit board size and thus the unit costs are reduced.

Durch die in den Unteransprüchen aufgeführten Maßnahmen ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale. Besonders vorteilhaft ist, daß das Stanzgitter zwei Anschlüsse für die elektrische Verbindung beider elektrischer Bauteile aufweist, sowie vorzugsweise zusätzlich zwei Abgriffe, zwischen denen eine Potentialdifferenz über den Meßweg des Stanzgitters abgreifbar und einer Auswerteelektronik zuführbar ist . Bei Stanzgittern handelt es sich um aus einem leitfähigen Blech einer bestimmten Dicke ausgestanzte Leitungsverbindungen einer vorgegebenen Geometrie für die Stromzufuhr und Abfuhr von und zu den elektrischen Bauteilen. Die dafür vorgesehenen Anschlußenden können aus der Blechebene abgebogen sein. Verwendet wird beispielsweise Kupferblech oder dergleichen. Somit sind die beiden Anschlüsse des Stanzgitters und Abgriffe zur Strommessung problemlos aus dem Blech zu stanzen und besonders einfach herzustellen.The measures listed in the subclaims result in advantageous developments and improvements of the features specified in the main claim. It is particularly advantageous that the lead frame has two connections for the electrical connection of the two electrical components, and preferably also two taps, between which a potential difference can be tapped via the measuring path of the lead frame and can be fed to an evaluation electronics. Punched grids are line connections of a predetermined geometry punched out of a conductive sheet of a certain thickness for the power supply and discharge from and to the electrical components. The connection ends provided for this purpose can be bent out of the plane of the sheet. For example, copper sheet or the like is used. Thus, the two connections of the lead frame and taps for current measurement can be easily punched out of the sheet and are particularly easy to manufacture.

Die geometrische Form des Stanzgitters hängt einerseits von der Anordnung der elektrischen/elektronischen Bauteile und der Abgriffe und andererseits von den im Laststromkreis vorkommenden und in dem Stanzgitter geleiteten Stromstärken ab.The geometrical shape of the lead frame depends on the one hand on the arrangement of the electrical / electronic components and the taps and on the other hand on the current strengths occurring in the load circuit and conducted in the lead frame.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Fig. 1 eine schematische Darstellung der erfindungsgemäßen Vorrichtung.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a schematic representation of the device according to the invention.

Beschreibung des AusführungsbeispielesDescription of the embodiment

Fig. 1 zeigt eine skizzierte elektronische Schaltung 10 in der beispielhaft als Verbraucher oder Schalter zwei beliebige elektrische bzw. elektronische Bauteile 12 herausgegriffen und dargestellt sind. Die Bauteile 12 stehen stellvertretend für Motorwicklung, Kondensator, Transistor, Widerstand, Spule oder dergleichen. Eine zwischen den zwei Bauteilen 12 durch beispielsweise eine Batterie angelegte elektrische Potentialdifferenz Üb führt zu einem zu messenden Strom I durch die Leitungsverbindung des Stanzgitters 14, das über Anschlüsse 16 mit den Bauteilen 12 elektrisch verbunden ist. Zwei weitere Abgriffe 18 nahe der Anschlüsse 16, oder an einer geeigneten anderen Stelle, sind vorgesehen, um eine Spannung U zwischen diesen abzugreifen und einer praktisch leistungslos arbeitenden1 shows a sketched electronic circuit 10, in which two arbitrary electrical or electronic components 12 are picked out and shown by way of example as consumers or switches. The components 12 represent motor winding, capacitor, transistor, resistor, coil or the like. One between the two components 12, for example by a battery Electrical potential difference U1 leads to a current I to be measured through the line connection of the lead frame 14, which is electrically connected to the components 12 via connections 16. Two further taps 18 near the connections 16, or at a suitable other point, are provided in order to tap a voltage U between them and a voltage that operates practically without power

Auswerteelektronik 20 zuzuführen. Der Strom I berechnet sich beispielsweise bei Gleichstrom in bekannter Weise aus dem ohmschen Gesetz U = R * I, wobei R den ohmschenTo supply evaluation electronics 20. For direct current, for example, the current I is calculated in a known manner from the ohmic law U = R * I, where R is the ohmic law

Meßwiderstand der Leitungsverbindung zwischen den Abgriffen 18 wiedergibt. Der Meßwiderstand wird somit nicht mehr als separates Bauteil verbaut, sondern das Stanzgitter 14, also die Verbindung zweier elektrischer Bauteile 12 selbst, wird als Meßwiderstand verwendet.Measuring resistance of the line connection between the taps 18 reproduces. The measuring resistor is therefore no longer installed as a separate component, but the lead frame 14, that is to say the connection between two electrical components 12 themselves, is used as the measuring resistor.

Der Widerstand R der Leitungsverbindung muß jedoch mit einer ausreichenden Genauigkeit bestimmt und mit der Größenordnung der zu messenden Ströme I abgeglichen werden. Beispielsweise werden bei einem sehr kleinen Widerstand R große Meßströme I benötigt, um überhaupt eine auswertbare Meßspannung U zwischen den Abgriffen 18 zu erhalten. Der Abgleich des Widerstandes R erfolgt vorzugsweise über eine Wegverlängerung der Leitungsverbindung. So können beim Stanzen des Stanzgitters oder mittels eines Lasers nachträglich Schnitte in die Leitungsverbindung eingebracht werden, die zu einer definierten Verlängerung des Stromweges bzw. zu einer Querschnittsverengung und damit zu einer Widerstandserhöhung führen.However, the resistance R of the line connection must be determined with sufficient accuracy and compared with the magnitude of the currents I to be measured. For example, with a very small resistance R, large measuring currents I are required in order to obtain an evaluable measuring voltage U between the taps 18 at all. The resistance R is preferably adjusted by extending the path of the line connection. When punching the lead frame or using a laser, cuts can subsequently be made in the line connection, which lead to a defined extension of the current path or to a cross-sectional narrowing and thus to an increase in resistance.

Die Bestimmung und der Abgleich des Meßwiderstandes R des Stanzgitters erfolgt beispielsweise mittels eines eingeprägten Prüfstroms I und insbesondere bei einer vorgegebenen Prüftemperatur, sofern das Ξtanzgittermaterial einen temperaturabhängigen Widerstand aufweist. Wird ein Material des Stanzgitters mit einem temperaturabhängigen Widerstands R verwendet, dann können darüber hinaus Korrekturgrößen in Abhängigkeit der gewünschten Meßgenauigkeit und dem gewünschten Temperaturmeßbereich notwendig werden, die vorteilhafterweise in einem EEPROM eines Mikrocontrollers des am Motor integrierten Steuergerätes 10 abgelegt werden oder durch eine Schaltung mit analogen und/oder digitalen Schaltelementen bzw. Bauteilen (z.B. ASIC) realisiert werden, mit denen die Meßspannung U temperaturabhängig korrigiert wird. Die Temperatur im Stanzgitterbereich wird vorteilhafterweise durch einen Temperatursensor gemessen. Die Korrekturgrößen korrigieren den Einfluß des temperaturabhängigen Widerstandes R auf die Meßspannung U, beispielsweise über einen Temperaturbereich von -40° bis +125°C.The measurement resistance R of the lead frame is determined and compared, for example, by means of an impressed test current I and in particular at a predetermined test temperature, provided that the lead frame material has a temperature-dependent resistance. If a material of the lead frame with a temperature-dependent resistance R is used, then correction values depending on the desired measurement accuracy and the desired temperature measurement range may also be necessary, which are advantageously stored in an EEPROM of a microcontroller of the control unit 10 integrated on the motor or by a circuit with analog and / or digital switching elements or components (eg ASIC) with which the measurement voltage U is corrected as a function of temperature. The temperature in the lead frame area is advantageously measured by a temperature sensor. The correction variables correct the influence of the temperature-dependent resistance R on the measuring voltage U, for example over a temperature range from -40 ° to + 125 ° C.

In einer alternativen Ausgestaltung kann die unerwünschte Temperaturdrift des Widerstandes R des Stanzgitters durch die Verwendung eines Stanzgittermaterials mit einem relativ temperaturunabhängigen ohmschen Widerstand verhindert werden. Hierfür ist beispielsweise Konstantan oder Manganin geeignet. Folglich ist die nachträgliche Korrektur der durch die Messung erhaltenen Werte der Meßspannung U mittels der Korrekturgrößen hier nicht mehr unbedingt notwendig.In an alternative embodiment, the undesired temperature drift of the resistance R of the lead frame can be prevented by using a lead frame material with a relatively temperature-independent ohmic resistance. Constantan or manganin, for example, is suitable for this. Consequently, the subsequent correction of the values of the measurement voltage U obtained by the measurement using the correction variables is no longer absolutely necessary here.

Die Stanzgitterteile 14 werden beispielsweise noch mit Kunststoff umspritzt . Damit werden die einzelnen Leitungsverbindungen des Stanzgitters räumlich fixiert. An die abgebogenen und aus dem Kunststoff herausragenden Anschlüsse 16 werden die Bauteile 12 angeschlossen. Ferner werden Stanzgitter 14, Platine und Bauteile 12 zum Schutz gegen Staub und anderen Umgebungseinflüssen eingegossen oder in einem Gehäuse, gebildet aus dem kunststoffummantelten Stanzgitter und einem Deckel, eingeschlossen.The lead frame parts 14 are, for example, still extrusion-coated with plastic. The individual line connections of the lead frame are thus spatially fixed. The components 12 are connected to the bent connections 16 which protrude from the plastic. Furthermore, lead frame 14, circuit board and components 12 are cast in or for protection against dust and other environmental influences enclosed in a housing, consisting of the plastic-coated lead frame and a cover.

Die erfindungsgemäße Schaltung 10 wird beispielsweise in Steuerungen für Versteilantriebe für Fenster oder Schiebedächer oder für die Klima- und Luftregelung in Kraftfahrzeugen eingesetzt. The circuit 10 according to the invention is used, for example, in controls for adjusting drives for windows or sunroofs or for climate and air control in motor vehicles.

Claims

Ansprüche Expectations 1. Elektrischen Schaltung (10), bei der Bauteile (12) durch elektrische Leitungen (14) verbunden sind, durch die ein zu detektierender Strom (I) fließt, dessen Stromstärke von einer Strommeßvorrichtung mit einem Meßwiderstand erfaßt wird, dadurch gekennzeichnet, daß als Meßwiderstand zur Erfassung der Stromstärke kein separates Bauteil sondern die elektrische Leitungsverbindung (14) selbst verwendet wird.1. Electrical circuit (10) in which components (12) are connected by electrical lines (14) through which a current to be detected (I) flows, the current strength of which is detected by a current measuring device with a measuring resistor, characterized in that as Measuring resistor for detecting the current is not a separate component but the electrical line connection (14) itself is used. 2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die elektrische Leitungsverbindung ein Stanzgitter (14) ist.2. Circuit according to claim 1, characterized in that the electrical line connection is a lead frame (14). 3. Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Leitungsverbindung (14) zwei Abgriffe (18) aufweist, zwischen denen eine Meßspannung (U) abgreifbar ist.3. Circuit according to claim 1 or 2, characterized in that the line connection (14) has two taps (18), between which a measuring voltage (U) can be tapped. 4. Schaltung nach Anspruch 3, dadurch gekennzeichnet, daß die Abgriffe (18) mit einer Auswerteschaltung verbunden sind.4. Circuit according to claim 3, characterized in that the taps (18) are connected to an evaluation circuit. 5. Schaltung nach Anspruch 4, dadurch gekennzeichnet, daß Korrekturgrößen in einem Speicher der Auswerteschaltung abgelegt sind, mit denen der Einfluß einer Temperatur auf den Meßwiderstand kompensierbar ist . 5. A circuit according to claim 4, characterized in that correction variables are stored in a memory of the evaluation circuit, with which the influence of a temperature on the measuring resistor can be compensated. 6. Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Wert des Meßwiderstandes der elektrischen Leitungsverbindung (14) der Größenordnung des zu messenden Stromes (I) angepaßt ist.6. Circuit according to claim 1 or 2, characterized in that the value of the measuring resistor of the electrical line connection (14) is adapted to the order of magnitude of the current (I) to be measured. 7. Schaltung nach Anspruch 6, dadurch gekennzeichnet, daß die Anpassung des Meßwiderstandes über eine Verlängerung des Stromweges durch die Leitungsverbindung (14) erfolgt ist.7. A circuit according to claim 6, characterized in that the adjustment of the measuring resistor via an extension of the current path through the line connection (14) has been carried out. 8. Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Leitungsverbindung (14) an beiden Enden jeweils einen Anschluß (16) für die elektrische Anbindung der Bauteile (12) mit der Leitungsverbindung (14) auf eist.8. Circuit according to claim 1 or 2, characterized in that the line connection (14) at both ends has a connection (16) for the electrical connection of the components (12) with the line connection (14). 9. Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Stanzgitter (14) aus einem Material besteht, das einen temperaturunabhängigen bzw. nahezu temperaturunabhängigen ohmschen Widerstand aufweist, insbesondere Konstantan. 9. Circuit according to claim 1 or 2, characterized in that the lead frame (14) consists of a material which has a temperature-independent or almost temperature-independent ohmic resistance, in particular constantan.
PCT/DE1999/001248 1998-08-27 1999-04-28 Electric circuit with device for detecting a current magnitude Ceased WO2000013031A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998138974 DE19838974A1 (en) 1998-08-27 1998-08-27 Electrical circuit with a device for detecting a current variable
DE19838974.4 1998-08-27

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WO2000013031A1 true WO2000013031A1 (en) 2000-03-09

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