WO2003021789A1 - Entree analogique pour circuit electronique - Google Patents
Entree analogique pour circuit electronique Download PDFInfo
- Publication number
- WO2003021789A1 WO2003021789A1 PCT/FR2002/002981 FR0202981W WO03021789A1 WO 2003021789 A1 WO2003021789 A1 WO 2003021789A1 FR 0202981 W FR0202981 W FR 0202981W WO 03021789 A1 WO03021789 A1 WO 03021789A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- analog
- computer
- sensor
- digital
- digital converter
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 19
- 206010003830 Automatism Diseases 0.000 abstract 1
- 230000006870 function Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
- H03M1/0619—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by dividing out the errors, i.e. using a ratiometric arrangement
- H03M1/0621—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by dividing out the errors, i.e. using a ratiometric arrangement with auxiliary conversion of a value corresponding to the physical parameter(s) to be compensated for
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
Definitions
- the invention relates to an analog input adaptable to the electrical output level of a sensor sensitive to a physical parameter.
- Electric or electronic automations generally include one or more signal inputs, in particular analog signals supplied by sensors of physical parameters such as pressure, temperature, linear displacement or any other type of parameter.
- the automation is designed to provide preprogrammed functionality based on the level or status of these parameters.
- FIG. 1a shows the block diagram of an analog input 10 of the state of the art connected to the output of a sensor 12 supplying the analog input a voltage Vs as a function of a physical parameter used by the automation.
- the analog input 10 essentially comprises an analog / digital converter 14 driven by its analog input 16 through a level 18 adaptation interface, by the voltage Vs at the sensor output and a voltage reference Vr 20 for the converter analog / digital 14.
- the analog / digital converter 14 provides digital information, at its digital output 22, depending on the level of the input voltage Vs applied to its analog input 16. This digital information is used by an electronic processing circuit, for example an automation .
- the voltage reference 20 is necessary to obtain the precision of conversion into digital of the analog voltage applied to the input 16 of the analog / digital converter 14.
- the theoretical dynamics of the analog input level Vs is a fixed value corresponding to the usual normalized dynamics of the sensors, for example from 0 to 10 volts.
- Figures 1b, 1c and 1d respectively show three types of sensors 24, 26 and 28 that can be connected to the analog input of Figure 1a.
- the sensor connected to the analog input can be: - or a 0-10 volt 24 sensor (see Figure 1b) providing a voltage between 0 and 10 volts precisely corresponding to the analog voltage range allowed by the analog input to benefit from the maximum resolution of the analog / digital converter.
- the disadvantage of such a 0-10 volt sensor is that it requires a regulated supply voltage so that it provides a maximum output voltage always equal to 10 volts.
- the potentiometer 26 provides a variable voltage between 0 volts and the voltage of the hot spot 30 of the potentiometer as a function of the position of the cursor.
- the hot spot 30 of the potentiometer is usually at the potential of the supply voltage Vcc of the electrical system including among other things the automation. This supply voltage Vcc is not very stable and sometimes unregulated, each electronic element of the system comprising its own regulation device.
- the drawback of using the potentiometer 26 of FIG. 1c supplied by the unregulated voltage Vcc is that, if the supply voltage Vcc becomes lower than the maximum voltage accepted by the analog / digital converter, there is no benefit from the resolution of the converter, when the cursor is at the hot spot 30 of the potentiometer. On the other hand, if the supply voltage Vcc exceeds the maximum voltage admitted by the analog / digital converter, the mechanical movement of the cursor is limited to this maximum voltage of the converter, which limits the measurement range of the parameter in this case the maximum possible movement of the cursor to the hot spot of the potentiometer.
- the output voltage of the potentiometer for the same position of the cursor, will vary as a function of the voltage Vcc applied to its hot spot, which affects the reliability of a position measurement.
- the regulated sensor 28 of FIG. 1d is used.
- the regulated sensor 28 includes the potentiometer 26 of FIG. 1c, the hot spot 30 of which is supplied by the supply voltage Vcc through a voltage regulator 32 in order to maintain the hot spot of the potentiometer substantially equal to 10 volts, which has the disadvantage of increasing the cost of the sensor and therefore that of the automation.
- the invention provides an analog input for electronic circuit intended to be connected to an electrical output of a sensor for measuring a physical parameter, the sensor being supplied by a voltage.
- RN characterized in that it comprises a computer controlling the analog / digital converter to carry out, an analog-digital conversion of the supply voltage Vcc, the analog / digital converter providing the computer with a digital value
- Vn (r / Ralim). R N.
- One of the main objects of the invention is that the analog input is reliable and ensures the same measurement accuracy whatever the sensor supply voltage or whatever the type of sensor.
- Other objects of this invention are: to benefit from the resolution of the analog / digital converter.
- Another economic object of the invention is to reduce the cost of analog input by simplifying its manufacture.
- the analog input comprises at least two analog / digital converters, a first converter for digitizing the supply voltage Vcc and a second converter for digitizing the analog voltage Vs at the output of the sensor.
- the analog input comprises a single analog / digital converter and a multiplexer of the signals from different sensors, each of the signals being digitized sequentially by the analog / digital converter, the multiplexer being controlled by the computer.
- FIG. 1a shows a block diagram of an analog input of the state of the art
- FIG. 1b, 1c and 1d respectively show three types of sensors usually connected to the analog input of Figure 1a;
- - Figure 2 shows a block diagram of an analog input according to the invention comprising two analog / digital converters;
- FIG. 2 represents the block diagram of an analog input 40, according to the invention, supplied by a supply voltage Vcc and receiving by an input terminal 42 the analog voltage Vs at the output of a sensor.
- the sensor is a potentiometer 44 connected by its hot point to the supply voltage Vcc and by its cold point to a reference potential Vm, for example the ground of the analog input.
- the analog input 40 comprises a first 46 and a second 48 analog / digital converters, the first converter 46 receiving by its analog input 50 through a first voltage adapter 52, the supply voltage Vcc, the second converter 48 receiving by its analog input 54 through a second voltage adapter 56, the analog voltage Vs to be measured taken at the cursor of potentiometer 44.
- the first analog / digital converter 46 provides at its digital output 58, the digital value of the supply voltage Vcc, the second converter 48 provides at its digital output 60 the digital value r of the analog voltage level Vs of the sensor.
- the analog input 40 comprises a computer 64 programmed to drive the two analog / digital converters, the computer receiving the two digital information Ralim and r from the converters analog / digital and providing digital information Vn as a function of the position of the cursor of potentiometer 44 such as:
- the computer is configured to perform the following sequences:
- the computer 64 controls the conversion, by the first converter 46, of the analog supply voltage Vcc of the sensor into a first digital value Ralim, then the storage of this first digital value in a RAM 68 of the computer;
- the computer 64 controls the conversion, by the second converter 48, of the analog voltage Vs of the sensor into a second digital value r, then the storage of this second digital value in the RAM ;
- the number of possible states measured by the converter will be 256.
- the measurement accuracy of the output voltage for a full scale voltage of 10 volts will depend on the resolution of the converter.
- FIG. 3 represents a block diagram of another analog input 70 according to the invention comprising a signal multiplexer 72 and a single analog / digital converter 74.
- the analog / digital converter 74 receives, through a voltage adapter 76, the voltage of one of the selected inputs of the signal multiplexer 72.
- the multiplexer 72 has n + 1 inputs (eO, e1, e2, ... ex, ... en) and an output 78 connected through the voltage adapter 76 to the analog input 80 of the analog / digital converter 74
- the first input eO (for example) of the multiplexer is connected to the supply voltage Vcc each of the other inputs of the multiplexer (e1, e2, .. ex, .. en) being connected to a respective sensor C1, C2 ,. .. Cn respectively supplying voltages Vs1, Vs2 ... Vsn corresponding to the different physical parameters measured by these sensors.
- the advantage of the analog input 70 according to the invention is that the sensors can be of a different nature such as those of FIGS. 1b, 1c, 1d.
- the analog input 70 comprises a computer 82 configured to drive the analog / digital converter 74 and the signal multiplexer 72.
- the computer is configured to perform the following sequences:
- the sequence of measurements of the voltages Vs1, Vs2, ... Vsx, .. Vsn therefore of the sequence of the selections of the inputs of the multiplexer, can be subject to priorities preprogrammed in the computer.
- Vsx (rx / Rio).
- RN RIO being the numerical value corresponding to the maximum output voltage of the sensor, ie 10 volts.
- the computer 64 is configured to take into account the type of sensor used for each input and to make the adapted calculation.
- Vcc the measurement of one of the selected inputs of the multiplexer and the calculation of the digital value of the voltage at this input, then go to the measurement of the next input.
- the configuration of the computer can be obtained by programming, using a series of instructions stored in a memory, dead of the computer.
- the analog / digital converter has a resolution greater than the announced resolution of the input.
- a higher resolution of the analog-to-digital converter than that required for the measurement accuracy for the announced measurement range allows the measurement of exceedances of the values of the parameters to be measured.
- an eight-bit converter will measure 256 voltage levels while a 10-bit converter will allow measure 1024 levels.
- These overshoots are possible insofar as the measurement voltage range of the analog input is greater than the supply voltage of the product in order to be able to measure it.
- the analog input according to the invention allows the detection of overshoots by the fact that the computer takes into account the supply voltage of the sensor.
- the advantage of the analog input according to the invention lies in the fact that it is not necessary to use a voltage reference for the analog / digital converter, the computer taking into account the value of the voltage of sensor supply, which reduces the cost of the automation.
- the sensor can be supplied by the system voltage which can vary without changing the accuracy of the parameter measurement.
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/486,712 US6980141B2 (en) | 2001-09-05 | 2002-08-30 | Analog input for electronic circuit |
EP02797679A EP1430605A1 (fr) | 2001-09-05 | 2002-08-30 | Entree analogique pour circuit electronique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/11487 | 2001-09-05 | ||
FR0111487A FR2829321B1 (fr) | 2001-09-05 | 2001-09-05 | Entree analogique pour circuit electronique |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003021789A1 true WO2003021789A1 (fr) | 2003-03-13 |
Family
ID=8866990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/002981 WO2003021789A1 (fr) | 2001-09-05 | 2002-08-30 | Entree analogique pour circuit electronique |
Country Status (4)
Country | Link |
---|---|
US (1) | US6980141B2 (fr) |
EP (1) | EP1430605A1 (fr) |
FR (1) | FR2829321B1 (fr) |
WO (1) | WO2003021789A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US12007522B2 (en) | 2018-10-30 | 2024-06-11 | Vitesco Technologies GmbH | Presence detection sensor for a motor vehicle |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7135998B2 (en) * | 2002-05-08 | 2006-11-14 | Continental Teves Ag & Co. Ohg | Electronic circuit arrangement for error-free analog/digital conversion of signals |
US10964133B2 (en) * | 2018-05-29 | 2021-03-30 | Zf Active Safety And Electronics Us Llc | Vehicle safety system with smart detection sensors |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5172115A (en) * | 1991-02-15 | 1992-12-15 | Crystal Semiconductor Corporation | Ratiometric A/D converter with non-rationometric error offset |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3653037A (en) * | 1969-12-31 | 1972-03-28 | Ibm | Apparatus and a method for automatically testing a system which receives an analog input signal |
US5077555A (en) * | 1988-12-07 | 1991-12-31 | Ford Motor Company | Input signal conditioning for microcomputer |
EP0495280A1 (fr) * | 1991-01-18 | 1992-07-22 | International Business Machines Corporation | Convertisseur analogique-numérique à compensation de dérive |
DE59901015D1 (de) * | 1998-04-23 | 2002-04-25 | Siemens Ag | Einrichtung zum ratiometrischen messen von sensorsignalen |
FR2784193B1 (fr) * | 1998-10-05 | 2001-01-05 | Texas Instruments France | Mecanisme integre permettant une detection de defaillances par test automatique en temps reel pour un convertisseur analogique/numerique |
JP4438222B2 (ja) * | 2000-12-06 | 2010-03-24 | 株式会社デンソー | 物理量検出装置 |
JP3637029B2 (ja) * | 2002-03-28 | 2005-04-06 | 三菱電機株式会社 | 車載電子制御装置 |
-
2001
- 2001-09-05 FR FR0111487A patent/FR2829321B1/fr not_active Expired - Lifetime
-
2002
- 2002-08-30 WO PCT/FR2002/002981 patent/WO2003021789A1/fr not_active Application Discontinuation
- 2002-08-30 US US10/486,712 patent/US6980141B2/en not_active Expired - Lifetime
- 2002-08-30 EP EP02797679A patent/EP1430605A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5172115A (en) * | 1991-02-15 | 1992-12-15 | Crystal Semiconductor Corporation | Ratiometric A/D converter with non-rationometric error offset |
Non-Patent Citations (3)
Title |
---|
GARDNER J W ET AL: "High-precision intelligent interface for a hybrid electronic nose", SENSORS AND ACTUATORS A, ELSEVIER SEQUOIA S.A., LAUSANNE, CH, vol. 62, no. 1-3, 1 July 1997 (1997-07-01), pages 724 - 728, XP004119715, ISSN: 0924-4247 * |
KOLLATAJ J A: "Digitized thermocouple compensation yields direct reading for data logger", ELECTRONICS, 2 FEB. 1970, USA, vol. 43, no. 3, pages 116 - 119, XP002211369, ISSN: 0883-4989 * |
PADDA K S ET AL: "Serial A/D makes system design easy and cost effective", ELECTRO 84. ELECTRONIC SHOW AND CONVENTION, BOSTON, MA, USA, 15-17 MAY 1984, 1984, Los Angeles, CA, USA, Electron. Conventions, USA, pages 22/2/1 - 7, XP002211370 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US12007522B2 (en) | 2018-10-30 | 2024-06-11 | Vitesco Technologies GmbH | Presence detection sensor for a motor vehicle |
Also Published As
Publication number | Publication date |
---|---|
FR2829321A1 (fr) | 2003-03-07 |
US20040246157A1 (en) | 2004-12-09 |
FR2829321B1 (fr) | 2004-12-24 |
US6980141B2 (en) | 2005-12-27 |
EP1430605A1 (fr) | 2004-06-23 |
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