WO2018122041A1 - Dispositif et procédé de détermination d'un courant à déterminer - Google Patents

Dispositif et procédé de détermination d'un courant à déterminer Download PDF

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Publication number
WO2018122041A1
WO2018122041A1 PCT/EP2017/083551 EP2017083551W WO2018122041A1 WO 2018122041 A1 WO2018122041 A1 WO 2018122041A1 EP 2017083551 W EP2017083551 W EP 2017083551W WO 2018122041 A1 WO2018122041 A1 WO 2018122041A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
measuring
determined
voltage
unit
Prior art date
Application number
PCT/EP2017/083551
Other languages
German (de)
English (en)
Inventor
Andreas Nass
Original Assignee
Harting Electric Gmbh & Co. Kg
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
Application filed by Harting Electric Gmbh & Co. Kg filed Critical Harting Electric Gmbh & Co. Kg
Publication of WO2018122041A1 publication Critical patent/WO2018122041A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • 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
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

Definitions

  • the present invention relates to the field of apparatus and methods for current determination or measurement, and more particularly to methods and apparatus for determining or measuring a current flowing through plug contacts of a connector.
  • a shunt resistor sometimes simply called a shunt
  • a shunt resistor which is a low resistance with a sufficiently well known resistance value.
  • the current to be measured is passed, in which case the voltage drop across the shunt resistor voltage is measured and then used via Ohm's law to determine the current.
  • An object underlying the present invention is to present an approach with which the disadvantages of the previous approaches in connection with a shunt resistor are avoided or at least reduced.
  • a device for determining a current to be determined is proposed according to a first aspect, as defined in claim 1, namely with a current source for a measuring current, a resistor and at least one voltage measuring unit, wherein the resistor comprises two elements of a plug connection and designed for this purpose in that the current to be determined and the measuring current flow through the resistor, the measuring current having a characteristic which distinguishes it from the current to be determined, the device being designed, on the basis of a value indicating the resistance value of the resistor Voltage measuring unit is obtained by utilizing the characteristic of the measuring current, and a value obtained from the voltage measuring unit indicating a voltage drop associated with the current to be determined to determine the current to be determined
  • a device element for a device for determining a current to be determined, as defined in claim 12, namely with a current source for a measuring current and at least one voltage measuring unit, the current source and the voltage measuring unit being for coupling to one Resistor, comprising two elements of a connector, are designed such that the current to be determined and the measuring current flow through the resistor, wherein the measuring current has a characteristic that distinguishes him from the current to be determined, wherein the device element is configured to, based a value indicative of the resistance value of the resistor obtained from the voltage measuring unit using the characteristic of the measuring current and a value obtained by the voltage measuring unit indicative of a voltage drop associated with the current to be determined to determine the current.
  • a method for determining a current to be determined namely a method and using a current source for a measuring current, a resistor and at least one voltage measuring unit, wherein the resistor comprises two elements of a plug connection and the current to be determined and the measuring current flow through the resistor, wherein the measuring current has a characteristic which distinguishes it from the current to be determined, with the steps of obtaining by the voltage measuring unit a value indicative of the resistance value of the resistor using the characteristic of Measuring current, of obtaining a value indicating a voltage drop associated with the current to be determined by the voltage measuring unit, and determining the current to be determined on the basis of the values obtained.
  • the invention is based on the invention that instead of a conventional shunt resistor and the resistance of the plug contact can be used if this is known with sufficient accuracy. It was recognized that the problem, according to which the resistance of the plug contact (which could also be described as contact resistance, as long as, is clear from the context, that this "contact resistance” is not necessary only to the resistance at the transition from plug-to-socket contact) over the life of a plug usually changes, thereby overcome that this contact resistance is repeatedly determined in each case in view of such a sufficiently current (ie with regard to the rate of change of Resistivity determination, the contact resistance can practically take over the role of a shunt resistor, without the contact resistance as a shunt resistor would have to be provided separately and without the contact resistance would have the same stability and accuracy requirements as the shunt resistance meet An additional complication results si Ch is in this case that it is usually not possible or desired to interrupt the current to be determined for a short time, so that only the flowing through the contact measurement or test current provides a voltage drop
  • the contact resistance of plug contacts in connectors can be used, which may be, for example, the resistance of only the contact point or the complete cable connection. In this case, however, it is relevant that the contact resistance is not constant in time and therefore needs to be determined promptly. This can be done, for example, via a test current (which is high-frequency compared to, for example, an alternating current of 50 Hz), which can be filtered separately.
  • the contact resistance can be determined in the presence of the high-frequency (for example, 50 Hz) test or measurement current from the corresponding high-frequency component of a test or measurement voltage and can then in connection with the voltage measurement analogous to the shunt resistor approach for determining the load current (as the determining current) (50 Hz in this example).
  • the high-frequency for example, 50 Hz
  • 50 Hz the high-frequency test or measurement current from the corresponding high-frequency component of a test or measurement voltage
  • the measuring current is an alternating current and the characteristic of the measuring current is a frequency of the measuring current, wherein the voltage measuring unit for measuring an alternating voltage with a frequency of the measuring current and for measuring an alternating voltage with a different frequency and / or a DC voltage is configured.
  • a signal processing unit coupled to the voltage measuring unit is further provided, which is designed to separate a signal having the frequency of the measuring current from an output of the voltage measuring unit.
  • An advantageous possibility for obtaining the component of the voltage drop indicative of the contact resistance is the use of signal processing, as already known in other contexts for similar purposes (isolation of a signal having a specific frequency).
  • the characteristic of the measuring current which distinguishes it from the current to be determined is one temporal clocking, wherein the voltage measuring unit is designed for a measurement of voltages according to the timing of the measuring current and the timing of the current to be determined.
  • the measuring current has a (known) temporal clocking, that is, for example, interrupted to a certain extent at known (or determinable) times, a voltage drop can be caused at these times with the measuring current, which only depends on the known measuring current and not on the current to be determined.
  • both the current to be determined and the measuring current to be present (at least temporarily) in the form of direct currents, the characteristic that distinguishes here being that at known times either only the current to be determined or only the measuring current through the resistor flows.
  • the measuring current is a direct current and the current to be determined is an alternating current, wherein the voltage measuring unit is configured for determining an offset of a voltage characteristic associated with the current to be determined, which is highlighted by the measuring current.
  • measuring current leads (depending on the direction) to an overall higher or lower current (including the current to be determined), which has a corresponding effect on the voltage drop that can be determined.
  • another aspect of the invention provides to use a measuring current in the form of an alternating current in the case of a direct current as the current to be determined.
  • the voltage measuring unit comprises a first and a second voltmeter, the first voltmeter being configured for measuring a voltage associated with the current to be determined and / or a voltage characteristic associated with the current to be determined, and the second voltmeter for a measurement of a voltage associated with the measuring current and / or a voltage curve associated with the measuring current is configured.
  • these voltmeters can be optimally matched in their design to the measuring current or the current to be determined in order to achieve the best possible results.
  • the current to be determined and the measuring current are in each case alternating currents with different frequencies, at least the second voltmeter having a filter unit which is tuned to the frequency of the measuring current.
  • a filter unit specifically filters out the known voltage with respect to the frequency of the determining current that selectively passes a voltage whose frequency corresponds to that of the measuring current or performs a separation as a high or low pass, can of the different Flow caused voltage drops or their courses can be determined separately from each other in a simple manner.
  • the voltage measuring unit has a voltmeter and a separation unit which is designed to provide the voltmeter with a time-dependent change in voltage associated with the current to be determined and / or a voltage characteristic associated with the current to be determined and a measurement current associated voltage and / or supply the measurement current associated voltage waveform for measurement.
  • a single voltmeter it can be used alternately to determine the voltage connected to the sense current (possibly together with the current to be determined) and the voltage associated with the current to be determined.
  • the timing is preferably matched to the generation of the measurement current.
  • the current source, the resistor and the voltage measuring unit are connected according to the four-wire technique.
  • a comparison unit and a signal unit are furthermore provided, wherein the comparison unit is designed with a reference value for a comparison of the value indicating the resistance value of the resistor and / or its time profile, the signal unit being designed for this purpose is to output a possible failure of the connector indicating signal when an overshoot or a predetermined deviation of the reference value is detected by a comparison unit.
  • a memory unit is additionally provided for storing one or more values indicative of the resistance value of the resistor and determined by the device, the device or the device element being designed for determining the reference value on the basis of stored values. If the resistance value is stored in its time course, these past values can be used for the reference value, in particular as such or the time course thereof.
  • the current to be determined is not sufficiently known with regard to a characteristic, for example due to systematic (but unknown) or random / pseudorandom fluctuations in the intensity, it may be provided that a time average obtained without concern of the measurement current or another simplifying approximation (eg sinusoidal waveform possibly with harmonics at alternating current with interference ments) is used as a reference in the determination of a voltage response to be assigned only to the measuring current.
  • a time average obtained without concern of the measurement current or another simplifying approximation eg sinusoidal waveform possibly with harmonics at alternating current with interference ments
  • Fig. 1 is a schematic representation of an embodiment of the inventive device
  • Fig. 2 is a schematic flow diagram of an embodiment of the method according to the invention.
  • Fig. 1 shows a schematic representation for illustrating an embodiment of the device according to the invention.
  • the device comprises a plug-in contact with elements 1a, 1b, a current source 3, a first voltmeter 5, a second voltmeter 7, a comparison unit 9, a memory unit 11 and a signal unit 13.
  • the current to be determined flows through the elements 1 a, 1 b.
  • the current source 3 and the voltmeter 5, 7 are connected in parallel with respect to the resistance formed by the elements 1 a, 1 b.
  • the voltage drop across the elements 1 a, 1 b via the ohmic law is directly related to the current to be determined, so that this exceeds the resistance value of the elements 1 a, 1 b and the voltage drop measured by the voltmeter 5 can be calculated.
  • a current is passed from the current source 3 via the elements 1 a, 1 b, this is superposed with the current to be determined.
  • the current to be determined is an alternating current with a frequency of 50 Hz.
  • the measuring current is also an alternating current and has a frequency well above 50 Hz.
  • the measurement signal of the voltmeter 7 is given to the comparison unit 9.
  • the comparison unit 9 is designed to isolate the voltage drop from the voltage signal of the voltmeter 7, which is the voltage drop, which is associated with the measuring current, and the voltage drop, which is associated with the current to be determined by suitable signal processing (in particular filtering) is associated with the measuring current, so that from this the resistance value of the contact resistance of the (contact) elements 1 a, 1 b can be determined.
  • the resistance value thus determined is compared by the comparison unit 9 with a reference value read from the memory unit coupled to the comparison unit 9, which is an earlier resistance value. If this results in a deviation beyond a certain tolerance, the comparison unit 9 causes the output of a corresponding signal via the signal unit 13. Otherwise, the determined resistance is used to determine the current to be determined.
  • FIG. 2 shows a schematic flow diagram of an exemplary embodiment of the method according to the invention, which is carried out, for example, within the scope of a device which is illustrated in FIG. 1.
  • step 15 using the characteristic of the measuring current, a value indicating the resistance of the resistor is obtained.
  • step 17 this value is compared with a reference value or a reference range, a corresponding signal being output in step 19 in the event of a deviation, overshoot and / or undershoot.
  • step 19 the Procedures are aborted. However, it is also possible that the method is continued in step 21.
  • step 21 a value indicative of a voltage drop associated with the current to be determined is obtained.
  • step 21 is carried out repeatedly so that the current to be determined is determined approximately continuously in the step 23 following step 21.
  • the method After a predetermined time, a predetermined number of repetitions, or other conditions, the method returns to step 15 to repeat the flow.

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

Abstract

La présente invention concerne le domaine des dispositifs et des procédés de détermination ou de mesure de courant. Pour présenter une solution qui, en ce qui concerne la ligne proprement dite conduisant le courant à mesurer ou à déterminer, permet de réduire les dépenses d'équipement et d'améliorer la stabilité contre les défaillances, il est proposé un dispositif de détermination d'un courant à déterminer qui comprend une source de courant (3) destinée à un courant de mesure, une résistance (1a, 1b) et au moins une unité de mesure de tension (5, 7). La résistance (1a, 1b) comprend deux éléments (1a, 1b) d'une connexion enfichable et est conçue de telle sorte que le courant à déterminer et le courant de mesure s'écoulent à travers la résistance (1a, 1b). Le courant de mesure a une caractéristique qui le distingue du courant à déterminer. Le dispositif est conçu pour déterminer le courant à déterminer sur la base d'une valeur de la résistance obtenue à partir de l'unité de mesure de tension (5, 7) à l'aide de la caractéristique du courant de mesure et sur la base d'une valeur, obtenue par l'unité de mesure de tension (5, 7), qui indique une chute de tension associée au courant à déterminer.
PCT/EP2017/083551 2016-12-29 2017-12-19 Dispositif et procédé de détermination d'un courant à déterminer WO2018122041A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016125884.9 2016-12-29
DE102016125884.9A DE102016125884A1 (de) 2016-12-29 2016-12-29 Vorrichtung und Verfahren zur Bestimmung eines zu bestimmenden Stroms

Publications (1)

Publication Number Publication Date
WO2018122041A1 true WO2018122041A1 (fr) 2018-07-05

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PCT/EP2017/083551 WO2018122041A1 (fr) 2016-12-29 2017-12-19 Dispositif et procédé de détermination d'un courant à déterminer

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DE (1) DE102016125884A1 (fr)
WO (1) WO2018122041A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT414048B (de) * 2004-07-06 2006-08-15 Lem Norma Gmbh Verfahren und einrichtung zur strommessung
US20160291060A1 (en) * 2011-09-12 2016-10-06 Analog Devices Global Current measurement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20220945U1 (de) * 2002-02-02 2004-09-30 Edag Engineering + Design Ag Diagnosestecker
DE102011078334A1 (de) * 2011-06-29 2013-01-03 Robert Bosch Gmbh Verfahren und System zum Kalibrieren eines Shunt-Widerstands
DE102012014969A1 (de) * 2012-07-30 2014-01-30 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Verfahren und Vorrichtung zur Strommessung in Kraftfahrzeugen
DE102015217898A1 (de) * 2014-09-17 2016-03-17 Continental Teves Ag & Co. Ohg Verfahren zum kontinuierlichen Kalibrieren von Strommesssystemen in Kraftfahrzeugen
EP3195000B1 (fr) * 2014-09-17 2020-02-19 Continental Teves AG & Co. OHG Étalonnage de capteurs de courant au moyen du courant de référence pendant la mesure du courant
US9689928B2 (en) * 2014-09-19 2017-06-27 Infineon Technologies Ag System and method for a built-in self-test of a battery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT414048B (de) * 2004-07-06 2006-08-15 Lem Norma Gmbh Verfahren und einrichtung zur strommessung
US20160291060A1 (en) * 2011-09-12 2016-10-06 Analog Devices Global Current measurement

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