FI117409B - Isolerad mätkrets för givarresistans - Google Patents

Isolerad mätkrets för givarresistans Download PDF

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Publication number
FI117409B
FI117409B FI20040802A FI20040802A FI117409B FI 117409 B FI117409 B FI 117409B FI 20040802 A FI20040802 A FI 20040802A FI 20040802 A FI20040802 A FI 20040802A FI 117409 B FI117409 B FI 117409B
Authority
FI
Finland
Prior art keywords
voltage
sensor
block
circuit
signal
Prior art date
Application number
FI20040802A
Other languages
English (en)
Finnish (fi)
Other versions
FI20040802A (sv
FI20040802A0 (sv
Inventor
Kari-Matti Laakso
Andreas Berts
Original Assignee
Abb Oy
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 Abb Oy filed Critical Abb Oy
Priority to FI20040802A priority Critical patent/FI117409B/sv
Publication of FI20040802A0 publication Critical patent/FI20040802A0/sv
Priority to CA2565288A priority patent/CA2565288C/en
Priority to RU2007100360/09A priority patent/RU2350003C2/ru
Priority to CNB2005800183459A priority patent/CN100481664C/zh
Priority to EP05751803.7A priority patent/EP1779487B1/en
Priority to PCT/FI2005/000267 priority patent/WO2005122354A1/en
Publication of FI20040802A publication Critical patent/FI20040802A/sv
Application granted granted Critical
Publication of FI117409B publication Critical patent/FI117409B/sv
Priority to US11/635,630 priority patent/US7592820B2/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
    • G01K7/25—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Claims (6)

1. Mätkrets för givarresistans, omfattande givaranslutningen (block T) för anslutning av en resistiv givare (Rx) till en spänningsdelarkrets (block
5 D), anordningar (block C) för matning av en spanning (UD) till nämnda spänningsdelarkrets, dä nämnda spänningsdelarkrets tillsammans med givaren bildar en seriekopplad serieresistans (R519, R520) samt anordningar (L501, L502, C508, R521, C509) för filtrering av den över givarresistansen resterande spänningen (Ux) tili en givarsignal (FB_VS), anordningar för 10 formning och framledning av givarsignalen, kännetecknad därav, att tili spänningsdelarkretsen (block D) spänningsmatande anordningar (block C) är anpassade för sänkning av den matade spänningen (Ud) som funktion av givarresistansen (Rx).
2. Mätkrets enligt patentkrav 1, kännetecknad därav, att de 15 spänningsmatande anordningama (block C) omfattar ett icke-inverterande förstärkarsteg (A501-B, R515, R524) för förstärkning av givarsignalen (FB_VS) och ett differentialförstärkarsteg (A501-C, R510, R514), som har anordnats att tili spänningsdelarkretsen (block D) mata en spänning (UD), vars storlek V*: bestäms av skillnaden mellan den tili den inverterande (-) ingängen anslutna « · m 20 förstärkta givarsignalen och den tili den icke-inverterande (+) ingängen » ψ anslutna stabiliserade referensspänningen (UREf).
3. Mätkrets enligt patentkrav 1 eller 2, kännetecknad därav, 9 9 9 att mätkretsen omfattar anordningar (block E) för förstärkning av givarsignalen * « *·*·* (FB_VS) tili en signalspänning (Ue), en sägtandsspänningsgenerator (block F), . 25 en komparator (block G) för bildning av en pulskodad PWM-signal som M;* resultat av en jämförelse mellan signalspänningen (UE) och nämnda • · *:* sägtandsspänningsgenerators utgängsspänning (UF) samt anordningar (block ·· » • H) för framledning av den nämnda PWM-signalen. '·*·' 4. Ett förfarande för mätning av givarresistans, där en spänning (UD) : '·· 30 mätäs tili en spänningsdelarkrets (block D), genom kretsen vidare via en serieresistans (R519, R520) tili en resistiv givare (Rx), över vars givarresistans 117409 ΛΗ___ resterande spanning (Ux) filtreras till en givarsignal (FB_VS), där den nämnda givarsignalen formas för vidareledning, kännetecknat därav, att den till spänningsdelarkretsen (block D) matade spänningen minskas som en funktion av givarresistansen (Rx).
5. Ett förfarande för mätning av givarresistans enligt patentkrav 4 kännetecknat därav, att den tili givarkretsen matade spänningen minskas väsentligen logaritmiskt som en funktion av givarresistansen (Rx).
6. Ett förfarande enligt patentkrav 4 eller 5, kännetecknat därav, att givarsignalen (FB_VS) förstärks tili en signalspänning (UE), som 10 genom jämförelse med en sägtandsspänning (Uf) används för att bilda en pulskodad PWM-signal för vidare framledning. • » • · · * »· • · • 1 · • · • · ··· • » • ft I ft · « * · fttf • ft ft · • i · • • vt ftftt» • · · • · • · • · · * · · ft · · • •ft ··« ft ft • f • · ft ft 9ft ft ft ft ft ft ft ft ft • ft1 ft ft • ft • ·· ft ft · • · ft ft ft • ft
FI20040802A 2004-06-10 2004-06-10 Isolerad mätkrets för givarresistans FI117409B (sv)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FI20040802A FI117409B (sv) 2004-06-10 2004-06-10 Isolerad mätkrets för givarresistans
CA2565288A CA2565288C (en) 2004-06-10 2005-06-08 Isolated measurement circuit for sensor resistance
RU2007100360/09A RU2350003C2 (ru) 2004-06-10 2005-06-08 Схема измерения сопротивления датчика с гальванической развязкой
CNB2005800183459A CN100481664C (zh) 2004-06-10 2005-06-08 传感器电阻的隔离测量电路
EP05751803.7A EP1779487B1 (en) 2004-06-10 2005-06-08 Isolated measurement circuit for sensor resistance
PCT/FI2005/000267 WO2005122354A1 (en) 2004-06-10 2005-06-08 Isolated measurement circuit for sensor resistance
US11/635,630 US7592820B2 (en) 2004-06-10 2006-12-08 Isolated measurement circuit for sensor resistance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20040802 2004-06-10
FI20040802A FI117409B (sv) 2004-06-10 2004-06-10 Isolerad mätkrets för givarresistans

Publications (3)

Publication Number Publication Date
FI20040802A0 FI20040802A0 (sv) 2004-06-10
FI20040802A FI20040802A (sv) 2005-12-11
FI117409B true FI117409B (sv) 2006-09-29

Family

ID=32524477

Family Applications (1)

Application Number Title Priority Date Filing Date
FI20040802A FI117409B (sv) 2004-06-10 2004-06-10 Isolerad mätkrets för givarresistans

Country Status (7)

Country Link
US (1) US7592820B2 (sv)
EP (1) EP1779487B1 (sv)
CN (1) CN100481664C (sv)
CA (1) CA2565288C (sv)
FI (1) FI117409B (sv)
RU (1) RU2350003C2 (sv)
WO (1) WO2005122354A1 (sv)

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Also Published As

Publication number Publication date
FI20040802A (sv) 2005-12-11
EP1779487A1 (en) 2007-05-02
US20070171055A1 (en) 2007-07-26
US7592820B2 (en) 2009-09-22
CN1965455A (zh) 2007-05-16
CA2565288A1 (en) 2005-12-22
RU2350003C2 (ru) 2009-03-20
EP1779487B1 (en) 2017-03-01
EP1779487A4 (en) 2008-01-09
WO2005122354A1 (en) 2005-12-22
CA2565288C (en) 2014-05-27
FI20040802A0 (sv) 2004-06-10
RU2007100360A (ru) 2008-07-20
CN100481664C (zh) 2009-04-22

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