EP1311864A1 - Circuit destine a detecter un courant traversant un consommateur - Google Patents

Circuit destine a detecter un courant traversant un consommateur

Info

Publication number
EP1311864A1
EP1311864A1 EP01964899A EP01964899A EP1311864A1 EP 1311864 A1 EP1311864 A1 EP 1311864A1 EP 01964899 A EP01964899 A EP 01964899A EP 01964899 A EP01964899 A EP 01964899A EP 1311864 A1 EP1311864 A1 EP 1311864A1
Authority
EP
European Patent Office
Prior art keywords
current
circuit arrangement
voltage
amplifier
ground
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
EP01964899A
Other languages
German (de)
English (en)
Inventor
Christoph Wenger
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
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1311864A1 publication Critical patent/EP1311864A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
    • 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

  • Circuit arrangement for detecting a current through a consumer
  • the invention relates to a circuit arrangement for detecting a current through a consumer, which is arranged between the outputs of two amplifiers, each of which has a supply voltage connection and a ground connection for supply with a unipolar operating voltage.
  • Circuit arrangements that work on the compensation principle.
  • a variable proportional to the current to be measured is detected and the detected variable is regulated to zero by generating the same variable with the opposite sign.
  • the current required to regulate the variable to zero represents a measure of the current to be measured.
  • a toroidal core 2 with an air gap is arranged around a feed line 1, for example of a rechargeable battery.
  • an element 3 for measuring the magnetic field strength, which is caused by the current is generated by the feed line 1 in the toroidal core 2, arranged.
  • the toroidal core 2 is further provided with a coil 6, by means of which a magnetic flux can be generated in the toroidal core 2. If a current is sent through the coil 6 and the size of the current is chosen so that the magnetic field strength in the air gap is zero, the current through the coil 6 corresponds to the current through the feed line 1, taking into account the number of turns of the coil 6 is.
  • a load resistor 7 is connected in series with the coil 6.
  • the voltage drop across the load resistor 7 is a measure of the current through the coil 6 and thus a measure of the current flowing through the feed line 1.
  • the direction of the current flowing through the coil 6 must be changeable. So that the direction of the current flowing through the coil 6 can be changed, the coil 6 is connected between the outputs of two amplifiers 4, 5. The inputs of the
  • Amplifiers 4, 5 are connected to the element 3 for detecting the magnetic field strengths in the air gap of the toroidal core 2, so that the field strength in the air gap can be regulated to zero.
  • a device for measuring a current flowing in a conductor, in which a magnetic field generated by the current flowing through the conductor is evaluated to determine the current is known from DE 195 49 181 AI.
  • the conductor is designed in such a way that it comprises two parts which are arranged parallel to one another and conduct the current in different directions.
  • a sensor is arranged between the two parts of the conductor, which delivers an output signal which is dependent on the generated magnetic field and which is representative of the strength of the flowing current.
  • the known arrangement does not give any indication of the use in a compensation current arrangement and the problems associated with it.
  • Form circuit arrangement such that it provides a ground-related output signal when operating with a low supply voltage.
  • According to the invention is a circuit arrangement for detecting a current through a consumer, which is arranged between the 5 outputs of two amplifiers, which for
  • Supply with a unipolar operating voltage each have a supply voltage connection and a ground connection, characterized in that between the connection of the operating voltage supply source and the supply voltage connection L0 and / or between the ground connection and the ground
  • Load resistor is connected, at which a voltage proportional to the current to be detected drops.
  • the invention makes use of the knowledge that the output currents supplied by the amplifiers are essentially those of the operating voltage source for supplying the amplifiers
  • An embodiment of the invention is particularly advantageous in which the ground connections of the amplifiers are connected to one another and the burden resistance is arranged between the connected ground connections and the ground. Since only one burden resistor is used in such a circuit arrangement, regardless of the direction in which current flows through the consumer, the current can be detected very precisely. This is particularly because inaccuracies regarding the tolerance of components, such as those in the L0 use of several burden resistances to detect the
  • the characteristic curve has, in a particularly advantageous manner, no kink in the zero point.
  • the voltage drop across the consumer can be measured by means of an amplifier, the output voltage of the amplifier being used to determine the current direction, as is the case with another
  • the amplifier is designed as a comparator. At the output of the amplifier or comparator, a voltage polarity corresponding to the current direction through the consumer can then be taken off.
  • a separate burden resistor can be arranged between the ground connection of each amplifier and the ground, as is the case with a
  • the size of the voltage drop across a load resistor corresponds to the size of the current through the consumer.
  • the direction is that flowing through the consumer Current, so that this determines the direction of the current through the consumer.
  • the electrical resistance of the burden resistors should be virtually identical. 5
  • An embodiment of the invention has also proven to be very advantageous, in which the output stages of the amplifiers consist of MOS-Fet, which operate in push-pull B mode. It is very advantageous here if the output stages of the amplifiers consist of MOS-Fet, which operate in push-pull B mode. It is very advantageous here if the output stages of the amplifiers consist of MOS-Fet, which operate in push-pull B mode. It is very advantageous here if the output stages of the
  • L0 amplifiers can be controlled by means of an operational amplifier, on which the output of the respective
  • Supply voltage of the operational amplifier is higher than that
  • the supply voltage of the operational amplifiers can advantageously be generated by means of a charge pump, as is the case in a further special embodiment of the
  • MOS-Fet output stages advantageously ensures that no cross currents flow. Because the gates of the transistors are isolated, the current flows through the load
  • the higher supply voltage of the operational amplifiers advantageously ensures that the output stage transistors can be completely turned on. By using a charge pump, the higher supply voltage of the
  • the voltage between the two branches of the bridge driver can be evaluated for sign recognition.
  • the voltage at the two bases of the NPN or PNP pair is compared in the ASIC using a comparator.
  • the main advantage of the invention is that, with appropriate dimensioning, only the tolerance of the burden resistance is included in the measurement accuracy. Due to the ground reference of the output voltage, this can be passed directly to an analog-digital converter that is regularly arranged in a controller used for evaluation, which has a very advantageous effect on the costs. There is also no need for a precision amplifier, which can also reduce costs.
  • FIG. 2 shows a schematic diagram of a first embodiment of a circuit arrangement according to the invention
  • Fig. 3 shows a second embodiment of a circuit arrangement according to the invention in a schematic representation
  • Fig. 4 shows a third embodiment of a circuit arrangement according to the invention in a schematic representation.
  • a consumer 16 designed as a compensation coil is between the
  • the amplifiers 14, 15 have a supply voltage connection 14a, 15a and a ground connection 14b, 15b for supply with a unipolar operating voltage V cc .
  • the supply connections 14a, 15a are connected directly to the connection 18a of the operating voltage source V cc .
  • the ground connections 14b, 15b are connected directly to one another.
  • a load resistor 17 is connected between the connected ground connections 14b, 15b and the ground 18b. The voltage U A dropping across the load resistor 17 is a measure of the current flowing through the consumer 16.
  • the voltage drop across the consumer 16 is given to the input of a comparator 19.
  • the output voltage of the comparator 19 can be used to evaluate the direction of the current flow through the consumer 16.
  • the gains of the amplifiers 14, 15 are set so that the first amplifier 14 has a gain of minus 1 and the second amplifier 15 has a gain of 1.
  • circuit arrangement shown in Figure 3 corresponds essentially to the circuit arrangement of Figure 2. Zur Differentiation of the components, however, the reference numerals begin with a 2 instead of a 1.
  • ground connections 24b, 25b of the amplifiers 24, 25 are not directly connected to one another in the circuit arrangement according to FIG.
  • the ground connections 24b, 25b are each connected to ground 28b via a separate burden resistor .27, 27 '.
  • the voltage drop U A ⁇ at the first burden resistor 27 corresponds to the magnitude of the current through the consumer 26 with a current flow from the output 25c of the second amplifier 25 to the output 24c of the first amplifier 24.
  • the voltage drop across the second burden resistor 27 'corresponds to the magnitude of the current through the Consumer 26 from the output 24c of the first amplifier 24 to
  • FIG. 4 essentially corresponds to the circuit arrangement of FIG. 3. To distinguish the components, however, the reference numerals begin with a 3 instead of a 2.
  • the amplifiers 34, 35 consist of an output stage, which consist of MOS-FET, which operate in push-pull B mode and are controlled by operational amplifiers 40, 41.
  • a load resistor 37, 37 ' is connected between the ground connection 34b, 35b and the ground 38b at each output stage.
  • the ground connection 34b, 35b corresponds to the drain of the P-channel transistor.
  • the operational amplifiers 40, 41 have their higher supply voltage, which they obtain from a charge pump 42.
  • the charge pump 42 operates in a conventional manner, so that a description of the operation of the charge pump 42 can be omitted.
  • the operational amplifiers 40, 41 are connected such that the first amplifier 34 has a gain of minus 1 and the second amplifier 35 has a gain of 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un circuit permettant de détecter un courant traversant un consommateur (16) qui est placé entre les sorties (14c, 15c) de deux amplificateurs (14, 15), ces amplificateurs ayant respectivement une prise de tension d'alimentation (14a, 15a) et une prise à la masse (14b, 15b) aux fins d'alimentation en tension de service unipolaire VCC. L'invention est caractérisée en ce qu'une résistance de charge (17) est montée entre la prise (18a) de la source de tension de service et la prise de secteur (14a, 15a) et/ou entre la prise à la masse (14b, 15b) et la masse (18b). Une tension Uass, proportionnelle au courant à détecter, diminue au niveau de cette résistance de charge.
EP01964899A 2000-08-12 2001-08-10 Circuit destine a detecter un courant traversant un consommateur Ceased EP1311864A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10039469A DE10039469A1 (de) 2000-08-12 2000-08-12 Schaltungsanordnung zum Erfassen eines Stroms durch einen Verbraucher
DE10039469 2000-08-12
PCT/DE2001/003081 WO2002014879A1 (fr) 2000-08-12 2001-08-10 Circuit destine a detecter un courant traversant un consommateur

Publications (1)

Publication Number Publication Date
EP1311864A1 true EP1311864A1 (fr) 2003-05-21

Family

ID=7652245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01964899A Ceased EP1311864A1 (fr) 2000-08-12 2001-08-10 Circuit destine a detecter un courant traversant un consommateur

Country Status (5)

Country Link
US (1) US6703822B2 (fr)
EP (1) EP1311864A1 (fr)
JP (1) JP2004506903A (fr)
DE (1) DE10039469A1 (fr)
WO (1) WO2002014879A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9291648B2 (en) * 2013-08-07 2016-03-22 Texas Instruments Incorporated Hybrid closed-loop/open-loop magnetic current sensor
US9535098B2 (en) * 2013-09-02 2017-01-03 Senis Ag Current transducer for measuring an electrical current

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508335A1 (de) * 1985-03-08 1986-09-11 Voest-Alpine Friedmann GmbH, Linz Schaltungsanordnung zur erfassung der stromaenderungssignale eines an einer konstanten gleichspannung liegenden nadelhubsensors einer einspritzduese fuer brennkraftmaschinen
CH673160A5 (fr) * 1986-02-10 1990-02-15 Landis & Gyr Ag
CH689465A5 (fr) 1993-11-02 1999-04-30 Lem Liaisons Electron Mec Dispositif capteur de courant électrique pour la mesure du courant circulant dans un conducteur.
EP0686850A1 (fr) 1994-06-09 1995-12-13 Lem S.A. Circuit de mesure de courants continus avec isolation de tension entre le circuit de courant et le circuit de mesure
DE4423429A1 (de) 1994-07-05 1996-01-11 Vacuumschmelze Gmbh Stromsensor nach dem Kompensationsprinzip
ATE213545T1 (de) 1995-05-09 2002-03-15 Vacuumschmelze Gmbh Kompensationsstromwandlung
DE19549181A1 (de) 1995-12-30 1997-07-03 Bosch Gmbh Robert Vorrichtung zur Messung eines in einem Leiter fließenden Stromes
DE19705767C2 (de) 1997-02-14 1999-09-02 Vacuumschmelze Gmbh Stromsensor nach dem Kompensationsprinzip

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0214879A1 *

Also Published As

Publication number Publication date
US6703822B2 (en) 2004-03-09
JP2004506903A (ja) 2004-03-04
WO2002014879A1 (fr) 2002-02-21
DE10039469A1 (de) 2002-02-21
US20020149356A1 (en) 2002-10-17

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