WO2009101548A1 - Circuit de conditionnement de signal pour des capteurs magnétorésistifs - Google Patents

Circuit de conditionnement de signal pour des capteurs magnétorésistifs Download PDF

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Publication number
WO2009101548A1
WO2009101548A1 PCT/IB2009/050458 IB2009050458W WO2009101548A1 WO 2009101548 A1 WO2009101548 A1 WO 2009101548A1 IB 2009050458 W IB2009050458 W IB 2009050458W WO 2009101548 A1 WO2009101548 A1 WO 2009101548A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
supply
signal conditioning
conditioning circuit
adc
Prior art date
Application number
PCT/IB2009/050458
Other languages
English (en)
Inventor
Stefan Butzmann
Original Assignee
Nxp B.V.
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 Nxp B.V. filed Critical Nxp B.V.
Publication of WO2009101548A1 publication Critical patent/WO2009101548A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices

Definitions

  • the present invention is related to a signal conditioning circuit for magnetoresistive sensors.
  • Magnetoresistive sensors are commonly used in many automotive applications, e.g. as wheel speed sensors in ABS systems or in angle applications for pedal positioning or throttle control.
  • the output signal of a magnetoresistive Wheatstone bridge is usually amplified and then converted to digital by an external digital-to-analog converter.
  • Magnetoresistive sensors are commonly used in many automotive applications, e.g. as wheel speed sensors in ABS systems or in angle applications for pedal positioning or throttle control.
  • the output signal of a magnetoresistive Wheatstone bridge is usually amplified and then converted to digital by an external analog-to-digital converter.
  • An example of such an application i.e. a Basic Circuit for BLDC Motor Sensor IC, is shown in Fig. 1, where the signals from a magnetoresistive angle sensor are amplified and where the analog field angle is determined by an external microcontroller (not shown) after ADC- conversion.
  • a known physical effect of magnetoresistive sensors is the degradation of the sensitivity with increasing temperature when these sensors are operated from a constant voltage supply. If a constant factor of amplification is used for the amplifiers, this means, that only part of the input range of the ADC is used at high temperatures.
  • a signal conditioning circuit for a sensor especially a magnetoresistive sensor, comprising ASIC supply means for supplying electric energy to the signal conditioning circuit and sensor supply means for supplying electric energy to the sensor, wherein the sensor supply means are arranged for supplying the sensor with a constant current proportional to a supply voltage with which the electric energy is fed to the signal conditioning circuit by the ASIC supply means.
  • the invention describes a way to maintain the relation between bridge supply voltage and external supply voltage even with the use of a current source supply for the bridge. This is achieved by making the bridge supply current proportional to the external signal conditioning ASIC supply voltage.
  • Fig. 1 is a Basic Circuit for BLDC Motor Sensor IC
  • Fig. 2 is a BLDC Motor Sensor IC with Current Bridge Supply
  • Fig. 3 is a BLDC Motor Sensor IC with Current Supply proportional to U 3 .
  • the output voltages read by the microcontroller can be described as follows:
  • the described circuitry to supply sensor elements - particularly magnetoresistive sensor elements - shows extreme advantages for use of magnetoresistive sensors when operated together with analog-digital converters.
  • Main feature of the invention is the supply of the sensor elements with a constant current proportional to the external supply voltage of the sensor system. This ensures that the digitally converted voltage is independent from external supply.
  • the invention can be used in all kind of sensor systems, where a current supply yields an improvement of sensor performance in comparison to a voltage supply.
  • the invention is particularly advantageous for being used with magnetoresistive sensors in applications for brushless DC motors.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un circuit de conditionnement de signal pour un capteur, en particulier un capteur magnétorésistif, comprenant un moyen d'alimentation ASIC pour fournir de l'énergie électrique au circuit de conditionnement de signal et un moyen d'alimentation de capteur pour fournir de l'énergie électrique au capteur, les moyens d'alimentation de capteur étant conçus pour alimenter le capteur avec un courant proportionnel constant à une tension d'alimentation avec laquelle l'énergie électrique est fournie au circuit de conditionnement de signal par le moyen d'alimentation ASIC.
PCT/IB2009/050458 2008-02-12 2009-02-05 Circuit de conditionnement de signal pour des capteurs magnétorésistifs WO2009101548A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08101534.9 2008-02-12
EP08101534 2008-02-12

Publications (1)

Publication Number Publication Date
WO2009101548A1 true WO2009101548A1 (fr) 2009-08-20

Family

ID=40756871

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/050458 WO2009101548A1 (fr) 2008-02-12 2009-02-05 Circuit de conditionnement de signal pour des capteurs magnétorésistifs

Country Status (1)

Country Link
WO (1) WO2009101548A1 (fr)

Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0215270A1 (fr) * 1985-08-20 1987-03-25 International Business Machines Corporation Procédé et appareil de lecture au moyen d'une tête magnétorésistive de données enregistrées
EP0588650A1 (fr) * 1992-09-17 1994-03-23 International Business Machines Corporation Circuit amplificateur
US5331478A (en) * 1992-10-07 1994-07-19 Silicon Systems, Inc. Magnetoresistive head amplifier
WO1996010192A1 (fr) * 1994-09-26 1996-04-04 Phase Metrics Procede et appareil d'essai de tetes magneto-resistives
WO1996016316A1 (fr) * 1994-11-22 1996-05-30 Robert Bosch Gmbh Systeme de determination sans contact de l'angle de rotation d'un element rotatif
US6054901A (en) * 1997-10-02 2000-04-25 Motorola, Inc. Low noise preamplifier
US6134060A (en) * 1997-06-10 2000-10-17 Stmicroelectronics, Inc. Current bias, current sense for magneto-resistive preamplifier, preamplifying integrated circuit, and related methods
DE20008931U1 (de) * 2000-05-19 2001-06-28 Siemens Ag Stellungsregler, insbesondere für ein durch einen Antrieb betätigbares Ventil, mit eigensicherem Aufbau
US6326781B1 (en) * 1999-01-11 2001-12-04 Bvr Aero Precision Corp 360 degree shaft angle sensing and remote indicating system using a two-axis magnetoresistive microcircuit
JP2003021503A (ja) * 2001-07-06 2003-01-24 Yamatake Corp 角度センサの温度補償装置およびトルクチューブ式計測計
EP1306687A2 (fr) * 2001-10-29 2003-05-02 Yamaha Corporation Capteur magnétique
DE10224747A1 (de) * 2002-06-04 2004-01-15 Infineon Technologies Ag Sensorschaltung und Verfahren zur Herstellung derselben
WO2004010089A1 (fr) * 2002-07-23 2004-01-29 Services Petroliers Schlumberger Dispositif compact de mesure de la vitesse et de la direction de rotation d'un objet
EP1469322A2 (fr) * 1996-09-17 2004-10-20 International Business Machines Corporation Capteur magnétorésistif à polarisation électronique
WO2004109275A1 (fr) * 2003-06-02 2004-12-16 Honeywell International Inc. Circuit d'attaque de reglage et de remise a zero et capteur magnetoresistif integres
JP2006098304A (ja) * 2004-09-30 2006-04-13 Yamaha Corp 磁気測定回路
DE102005047413A1 (de) * 2005-02-23 2006-09-14 Infineon Technologies Ag Magnetoresistives Sensorelement und Konzept zum Herstellen und Testen desselben
US20070047152A1 (en) * 2005-08-31 2007-03-01 Mitsubishi Electric Corporation Magnetic field detection apparatus and method of adjusting the same
EP1783507A1 (fr) * 2005-03-24 2007-05-09 Alps Electric Co., Ltd. Appareil de détection de champ magnétique et compas électronique utilisant ledit appareil
JP2007139130A (ja) * 2005-11-21 2007-06-07 Ckd Corp 流体圧シリンダ用センサ

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0215270A1 (fr) * 1985-08-20 1987-03-25 International Business Machines Corporation Procédé et appareil de lecture au moyen d'une tête magnétorésistive de données enregistrées
EP0588650A1 (fr) * 1992-09-17 1994-03-23 International Business Machines Corporation Circuit amplificateur
US5331478A (en) * 1992-10-07 1994-07-19 Silicon Systems, Inc. Magnetoresistive head amplifier
WO1996010192A1 (fr) * 1994-09-26 1996-04-04 Phase Metrics Procede et appareil d'essai de tetes magneto-resistives
WO1996016316A1 (fr) * 1994-11-22 1996-05-30 Robert Bosch Gmbh Systeme de determination sans contact de l'angle de rotation d'un element rotatif
EP1469322A2 (fr) * 1996-09-17 2004-10-20 International Business Machines Corporation Capteur magnétorésistif à polarisation électronique
US6134060A (en) * 1997-06-10 2000-10-17 Stmicroelectronics, Inc. Current bias, current sense for magneto-resistive preamplifier, preamplifying integrated circuit, and related methods
US6054901A (en) * 1997-10-02 2000-04-25 Motorola, Inc. Low noise preamplifier
US6326781B1 (en) * 1999-01-11 2001-12-04 Bvr Aero Precision Corp 360 degree shaft angle sensing and remote indicating system using a two-axis magnetoresistive microcircuit
DE20008931U1 (de) * 2000-05-19 2001-06-28 Siemens Ag Stellungsregler, insbesondere für ein durch einen Antrieb betätigbares Ventil, mit eigensicherem Aufbau
JP2003021503A (ja) * 2001-07-06 2003-01-24 Yamatake Corp 角度センサの温度補償装置およびトルクチューブ式計測計
EP1306687A2 (fr) * 2001-10-29 2003-05-02 Yamaha Corporation Capteur magnétique
DE10224747A1 (de) * 2002-06-04 2004-01-15 Infineon Technologies Ag Sensorschaltung und Verfahren zur Herstellung derselben
WO2004010089A1 (fr) * 2002-07-23 2004-01-29 Services Petroliers Schlumberger Dispositif compact de mesure de la vitesse et de la direction de rotation d'un objet
WO2004109275A1 (fr) * 2003-06-02 2004-12-16 Honeywell International Inc. Circuit d'attaque de reglage et de remise a zero et capteur magnetoresistif integres
JP2006098304A (ja) * 2004-09-30 2006-04-13 Yamaha Corp 磁気測定回路
DE102005047413A1 (de) * 2005-02-23 2006-09-14 Infineon Technologies Ag Magnetoresistives Sensorelement und Konzept zum Herstellen und Testen desselben
EP1783507A1 (fr) * 2005-03-24 2007-05-09 Alps Electric Co., Ltd. Appareil de détection de champ magnétique et compas électronique utilisant ledit appareil
US20070047152A1 (en) * 2005-08-31 2007-03-01 Mitsubishi Electric Corporation Magnetic field detection apparatus and method of adjusting the same
JP2007139130A (ja) * 2005-11-21 2007-06-07 Ckd Corp 流体圧シリンダ用センサ

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