WO2003103127A1 - Circuit de mesure - Google Patents

Circuit de mesure Download PDF

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Publication number
WO2003103127A1
WO2003103127A1 PCT/DE2003/001640 DE0301640W WO03103127A1 WO 2003103127 A1 WO2003103127 A1 WO 2003103127A1 DE 0301640 W DE0301640 W DE 0301640W WO 03103127 A1 WO03103127 A1 WO 03103127A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
offset
transducer
measuring circuit
measurement
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/DE2003/001640
Other languages
German (de)
English (en)
Inventor
Martin GÖTZENBERGER
Dirk Hofmann
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2003103127A1 publication Critical patent/WO2003103127A1/fr
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
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Measuring current only

Definitions

  • the invention relates to a measuring circuit, in particular for current measurement on a half-bridge circuit for controlling an asynchronous motor, according to the preamble of claim 1.
  • half-bridges for the electrical control of multiphase electric motors, which connect the individual phases of the electric motor to ground by means of a low-side switch and to a high-side switch ) connect to a supply voltage.
  • So-called SENSEFETS which consist of two MOS transistors connected in parallel and which are controlled together, are known for measuring current on half-bridges.
  • One of the two MOS transistors forms a switching element of the half-bridge as the main transistor, while the other MOS transistor of the SENSEFET is referred to as a sense transistor.
  • the electrical current through the half-bridge is thus divided in the SENSEFET in accordance with a component-specific relationship between the main and sense transistors, the current flowing through the sense transistor being substantially smaller and reflecting the current through the half-bridge.
  • the object of the invention is therefore to improve the measuring circuit described above in such a way that current measurement in the forward and backward directions is possible.
  • the invention therefore provides a measuring circuit with a measuring transducer which converts a measuring signal into an output signal, the measuring transducer having an offset input in order to take a predetermined offset into account during the conversion and the measurement of a measuring signal with any polarity or current direction to enable.
  • a measurement signal with any polarity or current direction is therefore converted by the predefined offset m into an output signal with a predefined polarity or current direction.
  • the measuring transformer is preferably a current amplifier which receives a measuring current on the input side and outputs a corresponding output current on the output side.
  • the predetermined offset for the signal conversion is preferably an offset current which is predetermined by a current source or a current sink.
  • the current source or current sink preferably has a regulator so that the offset current is as constant as possible.
  • the measuring circuit for the ground-side switch and for the voltage-side switch of a half-bridge each has a measuring transducer, both measuring transducers having an offset input in order to take a predetermined offset into account during the conversion and the measurement of a measurement signal with any To enable polarity or current direction.
  • the two transducers are preferably connected to a logic element which generates an output signal from the output signals of the two transducers, the predetermined offset preferably being eliminated.
  • the logic element is preferably a differential amplifier which subtracts the output signals of the two transducers from one another, the predetermined offset being eliminated.
  • the differential amplifier is preferably connected to a reference voltage source, which shifts the output voltage level of the measuring circuit by a predetermined voltage offset. In terms of circuitry, this can be achieved, for example, by the reference voltage source being connected to the via a coupling resistor non-inverting input of the differential amplifier is connected.
  • the measuring circuit according to the invention is particularly advantageous in the case of current measurement on a half-bridge circuit which is used for the electrical control of a phase of an asynchronous motor, since current measurement in the forward direction and in the reverse direction is possible.
  • FIG. 1 shows a measuring circuit according to the invention as a block diagram
  • FIG. 2 shows a detailed block diagram of the current sink shown in FIG. 1
  • FIG. 3 shows a detailed block diagram of the differential amplifier shown in FIG.
  • Figure 4 is a detailed block diagram of the current amplifier shown in Figure 1.
  • the block diagram in FIG. 1 shows a measuring circuit 1 which enables current measurement on a half bridge 2 both in the forward direction and in the reverse direction.
  • the half-bridge 2 consists of two SENSEFETs 3, 4 connected in series with a central voltage tap 5 for one phase of an asynchronous motor, the asynchronous motor not being shown for simplification.
  • a phase current I PH flows here via the voltage tap 5 and is controlled by the two SENSEFETs 3, 4.
  • the SENSEFET 3 forms a voltage-side (high-side) switch and is connected to a supply voltage VCC during the
  • SENSEFET 4 forms a low-side switch and is connected to ground.
  • Each of the two SENSEFETs 3, 4 consists of a main transistor TH and a sense transistor TS, the gate connections of which are connected together and are controlled together by a control signal Controll or Control2, the control signal Controll or Control2 being controlled by a motor control tion is generated, which is not shown for simplicity.
  • the main transistor TH serves to switch the half-bridge 2, while the sense transistor TS serves to measure a current I H or I L flowing through the SENSEFET 3 or 4.
  • the dram connections of the main transistor TH and the sense transistor TS are therefore connected together and connected to the supply voltage VCC in the SENSEFET 3 and to the central voltage tap 5 in the SENSEFET 4.
  • the current I H thus divides in the SENSEFET 3 according to a component-specific division ratio ki into a main current and a measurement current I S ⁇ , the main current flowing through the main transistor TH of the SENSEFET 3, while the measurement current I S ⁇ via the source connection of the sense transistor TS flows to a measurement input of a current amplifier 6 of the measurement circuit 1. It therefore applies to the measuring current Isi
  • the current I L flowing in the half-bridge 2 on the ground side is divided into a main current and a measurement current I s2 in accordance with the same component-specific division ratio ki, the main current flowing through the main transistor TH of the SENSEFET 4, while the measurement current I s2 flows through the source connection of the sense transistor TS of the SENSEFET 4 and is supplied to a current amplifier 7 of the measuring circuit 1. So the following applies:
  • the two current amplifiers 6, 7 are each connected on the input side to the source connection SOURCE of the main transistor TH of the SENSEFETs 3 and 4, so that the measurement current I sl or I s2 picked up by the current amplifiers 6, 7 is returned to the source Connection SOURCE of the main transistor TH flows back.
  • the ohmic character of the conductive channel in the two SENSEFETs 3, 4 ensures a symmetrical distribution of the currents I H , I between the main transistor TH and the sense transistor TS when I L > 0 or I H > 0.
  • the current distribution is also symmetrical in reverse operation when I L ⁇ 0 or I H ⁇ 0, provided the operating range is restricted.
  • the two current amplifiers 6, 7 are identical in construction and will be described in more detail later with reference to FIG. 4.
  • the current amplifier ⁇ amplifies the measurement current I S ⁇ with a component-specific gain factor k 2 , the current amplifier 6 having an offset input at which an offset current I OFFSET is present, by which the operating point of the current amplifier 6 is determined.
  • the current amplifier 6 outputs an output current I A1 , which is calculated using the following formula:
  • IAI k 2 Isi + IOFFSET
  • the current amplifier 7 amplifies the measurement current I s2 with the same gain factor k 2 , the current amplifier 7 also having an offset input which beit Vietnamese of the current amplifier 7 sets.
  • An offset current I OFFSET of the same magnitude is present at the offset input of the current amplifier 7, so that the current amplifier 7 outputs an output current I A2 on the output side, which is calculated according to the following formula:
  • IA 2 k 2 ' I 32 + IOFFSET.
  • the measuring circuit has a differential amplifier 8, which is connected on the input side to the two current amplifiers 6, 7 and is shown in detail in FIG. 3.
  • the differential amplifier 8 is connected to a reference voltage source 9, which provides an offset voltage U OFFSET and thus defines the operating point of the differential amplifier 8.
  • the determination of the operating point by the reference voltage source 9 advantageously enables the output voltage level to be adapted to the input voltage level of an analog / digital converter, which can be connected to the measuring circuit 1.
  • the differential amplifier 8 therefore outputs a voltage U 0UTPUT on the output side , which is given by the following formula:
  • a current sink 10 is therefore provided to generate the offset current I OFFSET , which is shown in detail in FIG.
  • the inverting input of the operational amplifier DA1 is connected to the ground connection of the transistor T1, while the non-inverting input of the transistor T1 is connected to the reference voltage source 11.
  • the operational amplifier DA1 thus regulates the offset current I OFFSET at the offset input of the current amplifier 6 to the predetermined setpoint.
  • the inverting input of the operational amplifier DA2 is connected to the ground connection of the transistor T2, while the non-inverting input of the operational amplifier DA2 is connected to the reference voltage source 11.
  • the operational amplifier DA2 regulates the offset current I OFFSET at the offset input of the current amplifier 7 to its predetermined setpoint.
  • the differential amplifier 8 has two measuring inputs which are connected to the outputs of the two current amplifiers 6, 7.
  • the operational amplifier DA3 creates a virtual short circuit between the two inputs of the differential amplifier 8, which is important for the measurement accuracy.
  • the current amplifier 6 has an operational amplifier DA4 on the input side with a transistor T10 connected downstream, which forces the same potential at the inputs of the current amplifier 6.
  • the operational amplifier DA1 is connected via three current mirror arrangements R11-R17, T3-T9 to a signal output at which the output current I A ⁇ is output.
  • the transistor T10 Since the transistor T10 only allows current to flow in one direction, a resistance is set by the resistors R12, R17 and R16, which is mirrored by the transistors T4, T3, T9 and T8 on the input side. Due to the additional current, the exact size of which is irrelevant, the current in the transistor T10 always flows in one direction.
  • the sense current I S ⁇ is therefore available independently of the potential at the collector of the transistor T10 and is combined with the offset current I OFFSET through the current mirror of the transistors
  • T5, T6 and T7 made available to a subsequent circuit.
  • the current amplifier 6 has two voltage sources 14, 15, which represent the voltage supply to the measuring circuit, the supply reference potential being applied to the source connection SOURCE of the SENSEFET 3. This is advantageous since the driver supply of the SENSEFET 3 must also relate to its SOURCE source connection.
  • the structure of the current amplifier 6 is designed such that the amount of the internal cross current through the resistors R12, R17 and R16 or the transistors T4, T3 and T9, T8 is not included in the measurement. This is important for an integration in an IC.
  • the invention is not restricted to the preferred exemplary embodiment described above. Rather, a large number of variants and modifications are possible which also make use of the inventive idea and therefore fall within the scope of protection.

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

Abstract

L'invention concerne un circuit de mesure (1), servant notamment à mesurer le courant sur un circuit en demi-pont pour la commande d'un moteur électrique polyphasé. Le circuit de mesure selon l'invention comprend un transducteur de mesure (6) servant à convertir un premier signal de mesure (IS1) en un signal de sortie (IA1). Selon l'invention, le transducteur de mesure (6) présente une entrée de décalage permettant de tenir compte d'un décalage prédéfini (IDECAL) lors de la conversion et de mesurer un signal de mesure à polarité quelconque.
PCT/DE2003/001640 2002-05-29 2003-05-20 Circuit de mesure Ceased WO2003103127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002123977 DE10223977C1 (de) 2002-05-29 2002-05-29 Messschaltung
DE10223977.0 2002-05-29

Publications (1)

Publication Number Publication Date
WO2003103127A1 true WO2003103127A1 (fr) 2003-12-11

Family

ID=27675196

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/001640 Ceased WO2003103127A1 (fr) 2002-05-29 2003-05-20 Circuit de mesure

Country Status (2)

Country Link
DE (1) DE10223977C1 (fr)
WO (1) WO2003103127A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2271187B1 (fr) 2009-06-30 2017-04-19 Helvar Oy Ab Contrôle et mesure des fonctions d'un ballast électronique

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102959407B (zh) * 2010-07-01 2016-04-13 大陆-特韦斯贸易合伙股份公司及两合公司 电流传感器
CN103797615B (zh) * 2011-07-14 2016-12-07 大陆-特韦斯贸易合伙股份公司及两合公司 用于引导电流的装置
US9213351B2 (en) 2013-11-22 2015-12-15 Analog Devices, Inc. Bi-directional current sensor
US9335779B2 (en) 2014-03-12 2016-05-10 Infineon Technologies Austria Ag Linear high speed tracking current sense system with positive and negative current
US9798347B2 (en) 2014-10-30 2017-10-24 Infineon Technologies Austria Ag High speed tracking dual direction current sense system
US9664713B2 (en) 2014-10-30 2017-05-30 Infineon Technologies Austria Ag High speed tracking dual direction current sense system
US9667243B2 (en) 2015-09-11 2017-05-30 Infineon Technologies Austria Ag High speed tracking current sense system
CN109030996A (zh) * 2018-07-10 2018-12-18 厦门智牛物联网科技有限公司 一种应用在插座上的涓流充电检测方法及系统
DE102022210524A1 (de) * 2022-10-05 2024-04-11 Vitesco Technologies Germany Gmbh Messaufbau und Verfahren zum Messen eines Stroms

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5053688A (en) * 1989-03-07 1991-10-01 Sundstrand Corporation Feedback circuit for eliminating DC offset in drive current of an AC motor
US5091842A (en) * 1989-04-27 1992-02-25 Mitsubishi Denki Kabushiki Kaisha Device for removing d.c. components from output of multi-phase inverter
EP0475709A2 (fr) * 1990-09-12 1992-03-18 Kabushiki Kaisha Toshiba Dispositif de contrôle d'un onduleur capable de supprimer la composante continue de magnétisation du transformateur triphasé
US6154379A (en) * 1998-07-16 2000-11-28 Tdk Corporation Electric power conversion device

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US4654568A (en) * 1986-08-21 1987-03-31 Motorola, Inc. MOSFET "H" switch with current sensing
DE3633791A1 (de) * 1986-10-03 1988-04-14 Endress Hauser Gmbh Co Verfahren und anordnung zur messung des widerstandsverhaeltnisses an einer widerstands-halbbruecke
DE69026525T2 (de) * 1989-05-09 1996-09-12 United Technologies Automotive Schaltung zur Leistungsabgabe mit Stromerfassung
US4933621A (en) * 1989-05-12 1990-06-12 General Electric Company Current chopping strategy for switched reluctance machines
DE4404999A1 (de) * 1994-02-17 1995-08-24 Woelfle Gmbh Schaltungsanordnung zur Meßwerterfassung
DE19603340A1 (de) * 1996-01-31 1997-08-07 Bosch Gmbh Robert Einrichtung zur Bestimmung des Durchsatzes eines strömenden Mediums
DE19833099C1 (de) * 1998-07-23 1999-10-28 Sandler Helmut Helsa Werke Meß-System zur Messung der Konzentration von Schadgasen
US6518880B2 (en) * 2000-06-28 2003-02-11 Denso Corporation Physical-quantity detection sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5053688A (en) * 1989-03-07 1991-10-01 Sundstrand Corporation Feedback circuit for eliminating DC offset in drive current of an AC motor
US5091842A (en) * 1989-04-27 1992-02-25 Mitsubishi Denki Kabushiki Kaisha Device for removing d.c. components from output of multi-phase inverter
EP0475709A2 (fr) * 1990-09-12 1992-03-18 Kabushiki Kaisha Toshiba Dispositif de contrôle d'un onduleur capable de supprimer la composante continue de magnétisation du transformateur triphasé
US6154379A (en) * 1998-07-16 2000-11-28 Tdk Corporation Electric power conversion device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2271187B1 (fr) 2009-06-30 2017-04-19 Helvar Oy Ab Contrôle et mesure des fonctions d'un ballast électronique

Also Published As

Publication number Publication date
DE10223977C1 (de) 2003-09-04

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