CN218158092U - Potentiometer reading device and arrangement - Google Patents
Potentiometer reading device and arrangement Download PDFInfo
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- CN218158092U CN218158092U CN202220525738.XU CN202220525738U CN218158092U CN 218158092 U CN218158092 U CN 218158092U CN 202220525738 U CN202220525738 U CN 202220525738U CN 218158092 U CN218158092 U CN 218158092U
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- potentiometer
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- 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
- G01D5/16—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 by varying resistance
- G01D5/165—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 by varying resistance by relative movement of a point of contact or actuation and a resistive track
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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Abstract
The invention relates to a potentiometer reading device and apparatus. A potentiometer reading device for determining a potentiometer value relating to the position of a sliding contact (19) of a potentiometer (12), comprising an upper terminal point (21) for connection to an upper supply terminal (17) of the potentiometer (12), a sliding contact terminal point (23) for connection to a sliding contact terminal (20) of the potentiometer and a lower terminal point (22) for connection to a lower supply terminal (18) of the potentiometer (12), wherein the potentiometer reading device (11) is designed to provide a supply potential at the upper terminal point (21), wherein the potentiometer reading device (11) is furthermore designed to fixedly set a reference potential at the lower terminal point (22), the reference potential being between a reference potential, in particular a ground potential, of the potentiometer reading device (11), detect a sliding contact potential applied at the sliding contact terminal point (23) and determine the potential from the detected sliding contact potential taking into account the reference potential.
Description
Technical Field
The utility model relates to a potentiometre reading equipment for confirming the potentiometre value related to the position of the sliding contact of potentiometre, potentiometre reading equipment includes the upper terminal point that is used for being connected to the last power supply terminal of potentiometre, is used for being connected to the sliding contact terminal point of the sliding contact terminal of potentiometre and is used for being connected to the lower terminal point of the lower power supply terminal of potentiometre, and wherein potentiometre reading equipment is constructed and is used for providing the power supply potential in upper terminal point department. The supply potential is preferably greater than the ground potential of the potentiometer read-out device.
Background
DE 3932484 A1 describes a device for detecting the position of an actuator (stellbright). In order to detect the position of the actuator, a slider (Schleifer) of a potentiometer is coupled to the actuator, so that the voltage at the slider corresponds to the actuator position. A processing unit connected downstream of the potentiometer taps supplies the potentiometer with a supply voltage and is provided in such a way that the signal swing (Signalhub) at the potentiometer taps is equal to the maximum processable voltage. In both end positions (endgears) of the actuator element, a voltage occurs at the potentiometer, which is the limit of the voltage range that can be handled by the analog-digital converter.
Disclosure of Invention
The object of the invention is to modify the potentiometer read-out device mentioned at the outset in such a way that the potentiometer read-out device can be used flexibly and safely.
This object is achieved by a potentiometer reading device for determining a potentiometer value relating to the position of a sliding contact of a potentiometer. The potentiometer reading device is designed to fixedly set a reference potential at the lower terminal point, which is between a reference potential and a supply potential of the potentiometer reading device. Exemplarily, the reference potential is a ground potential and the reference potential is larger than the ground potential. The potentiometer read-out device is furthermore designed to detect a sliding contact potential applied to the sliding contact terminal point and to provide a potentiometer value as a function of the detected sliding contact potential, taking into account the reference potential.
The supply potential, the slider potential and the reference potential are preferably between the main supply potential and the reference potential, wherein the supply potential is closer to the main supply potential than to the reference potential. The slider potential is preferably between the supply potential and the reference potential. The reference potential is expediently between the reference potential and the main supply potential and/or the supply potential. The supply potential is expediently between the reference potential and the main supply potential. The reference potential is (significantly) closer to the reference potential than to the supply potential and/or the main supply potential.
As long as the main supply potential is positive, the other potentials, i.e. in particular the reference potential, the slider potential and/or the supply potential, are expediently greater than the reference potential, in particular the ground potential.
The minimum sliding contact potential, i.e. the minimum sliding contact potential that can be achieved by a change in the position of the sliding contact, is expediently greater than ground potential and, for example, equal to a reference potential. This position of the sliding contact given a minimum sliding contact potential shall also be referred to as zero position. The zero position is in particular the end position of the sliding contact.
In the case of a conventional potentiometer reading device, the lower supply terminal is at ground potential, so that in the zero position of the sliding contact, the sliding contact potential is equal to ground potential. This makes it difficult to accurately measure the zero position. Furthermore, in this case, the zero position cannot usually be distinguished from fault situations, such as line interruptions and/or short circuits, which can likewise lead to the sliding contact potential being equal to ground potential.
By fixedly setting a reference potential at the lower terminal point, which is greater than ground potential, it becomes possible to measure the zero position more accurately. Furthermore, by setting the reference potential at the lower terminal point, it becomes possible to distinguish a fault situation in which the sliding contact potential is at ground potential from a zero position and thus to identify. Therefore, the potentiometer reading device can be safely used.
The fixedly set reference potential is expediently independent of the total resistance of the potentiometer, so that a potentiometer reading device can be used with different potentiometers, i.e. potentiometers having different total resistances. Therefore, the potentiometer reading device can be flexibly used.
Advantageous refinements are the subject of further embodiments.
The invention further relates to an arrangement consisting of a potentiometer and a reading device for a potentiometer, wherein the upper terminal is connected to the upper supply terminal of the potentiometer, the sliding contact terminal is connected to the sliding contact terminal of the potentiometer and the lower terminal is connected to the lower supply terminal of the potentiometer.
The invention further relates to a method for operating the device, comprising the following steps: -providing a supply potential at an upper terminal point, -fixedly setting a reference potential at a lower terminal point, said reference potential being between said reference potential and said supply potential, -detecting a slider potential applied at said slider terminal point, -determining said potentiometer value from said detected slider potential taking into account said reference potential.
The method is preferably configured in accordance with a further development of the potentiometer reading device and/or the apparatus.
Drawings
Further exemplary details and exemplary embodiments are set forth below with reference to the figures. In this case, the amount of the solvent to be used,
FIG. 1 shows a schematic diagram of an apparatus with a potentiometer and a potentiometer reading device, an
Fig. 2 shows a system with two potentiometer read-out devices.
Detailed Description
Fig. 1 shows an apparatus 10 comprising a potentiometer read-out device 11 and a potentiometer 12. Purely exemplarily, the device 10 has an actuator 14, which comprises a potentiometer 12. Thus, the potentiometer 12 is exemplary part of the actuator 14. The apparatus 10 represents a preferred application environment for the potentiometer read-out device 11. The potentiometer read-out device 11 can also be provided independently of the apparatus 10, i.e. in particular without the potentiometer 12.
The device 10, in particular the actuator 14 and/or the potentiometer read-out device 11, is preferably implemented for industrial use, in particular for industrial automation. The actuator 14 is suitably an industrial actuator and/or the potentiometer reading device 11 is an industrial potentiometer reading device.
The actuator 14 is embodied, for example, as an electric and/or pneumatic actuator. The actuator 14 comprises actuator segments (Aktorglied) 15 that can be placed in different positions. The actuator 14 may be implemented, for example, as a two-wire device. The actuator 14 is preferably actuated via an analog current interface (Stromschnittstelle), in particular via a 4-20 mA current interface.
The potentiometer 12 includes a potentiometer resistance 16, which shall also be referred to as the total resistance and/or nominal value of the potentiometer 12. The total resistance is preferably between 3 kOhm and 80 kOhm.
The potentiometer 12 furthermore comprises an upper supply terminal (oberen Versorungsansschluss) 17 and a lower supply terminal (uneter Versorungsansschluss) 18, between which the potentiometer resistance 16 is connected. The potentiometer 12 furthermore comprises a sliding contact 19, which sliding contact 19 is embodied in particular as a displaceable sliding contact which bears against the potentiometer resistance 16. The potentiometer 12 has a sliding contact terminal 20, at which a sliding contact potential applied to the sliding contact 19 can be tapped.
The sliding contact 19 is in particular mechanically coupled to the actuator element 15 in a suitable manner, so that the sliding contact 19 is moved together with the actuator element 15 and is positioned relative to the potentiometer resistance 16 as a function of the position of the actuator element 15. The electrical resistance between the upper supply terminal 17 and the sliding contact terminal 20 and/or the electrical resistance between the lower supply terminal 18 and the sliding contact terminal 20 depends on the position of the sliding contact 19 relative to the potentiometer resistance 16 and thus in particular on the position of the actuator element 15. In particular, the slide contact potential that can be tapped at the slide contact terminal 20 depends on the position of the slide contact 19 relative to the potentiometer resistance 16 and therefore in particular on the position of the actuator element 15.
The potentiometer reading device 11 is used to determine a potentiometer value related to the position of the sliding contact 19 of the potentiometer 12. The potentiometer value preferably maps the position of the sliding contact 19 relative to the potentiometer resistance 16. For example, the potentiometer value is proportional to the position of the sliding contact relative to the potentiometer resistance 16. Preferably, the minimum value of the potentiometer value maps the first end position of the sliding contact 19. For example, in the first end position, the slider potential is minimal. The maximum value of the potentiometer value is suitably mapped to the second end position of the sliding contact 19. For example, the slider potential is greatest in the second end position.
The potentiometer read-out device 11 comprises an upper terminal point (oberen Anschlusspunkt) 21 for connection to the upper supply terminal 17, a lower terminal point 22 for connection to the lower supply terminal 18 and a sliding contact terminal point 23 for connection to the sliding contact terminal 19. Exemplarily, the upper terminal point 21 is connected to the upper power supply terminal 17, the lower terminal point 22 is connected to the lower power supply terminal 18 and the sliding contact 23 is connected to the sliding contact terminal 19.
The potentiometer read-out device 11 is configured to provide a supply potential at the upper terminal point 21. The supply potential is suitably greater than the reference potential of the potentiometer reading device. The reference potential is preferably a ground potential, exemplarily a ground potential of the potentiometer read device 11 applied to a ground (master) 34 of the potentiometer read device 11. Ground potential refers in particular to zero volts.
The potentiometer read-out device 11 is furthermore designed to fixedly set a reference potential at the lower terminal point 22. The reference potential is between the reference potential and the supply potential. The reference potential is illustratively greater than ground potential. For example, the reference potential is at least 0.3V, and particularly exactly 0.3V, greater than ground. The reference potential is suitably smaller than the supply potential.
The potentiometer reading device 11 is furthermore designed to detect the slider potential applied to the slider terminal point 23 and to provide, in particular to calculate, a potentiometer value as a function of the detected slider potential, taking into account the reference potential. For example, the potentiometer read device 11 detects the slider potential with respect to ground potential, i.e. in particular as a voltage between the slider potential and ground potential. This voltage between the slider potential and the ground potential shall also be referred to as the slider voltage. In the provision, in particular the calculation, of a potentiometer value, the potentiometer read-out device 11 preferably takes into account the reference potential with respect to the ground potential, i.e. in particular as a voltage between the reference potential and the ground potential. This voltage between the reference potential and the ground potential shall also be referred to as reference voltage. The reference potential, in particular the reference voltage, is preferably stored in the potentiometer read-out device 11, in particular beforehand. The potentiometer reading device 11 suitably performs a calculation based on the sliding contact potential, in particular the sliding contact voltage, and a reference potential, in particular a reference voltage, in order to obtain a potentiometer value. For example, the potentiometer read-out device 11 calculates a reference potential, in particular a reference voltage, from the slider potential, in particular the slider voltage, in order to determine a potentiometer value. For example, the potentiometer reading device 11 calculates a difference between the slider potential and a reference potential, particularly, between the slider voltage and a reference voltage, and provides a potentiometer value based on the difference.
The potentiometer read-out device 11 is preferably designed to provide a reference potential independently of the total resistance of the potentiometer 12, in particular as long as the total resistance of the potentiometer 12 is in the range from 3 kOhm to 80 kOhm. In particular, the potentiometer read device 11 always provides the same reference potential at the lower terminal point 22, independently of the potentiometer resistance 16 of the potentiometer connected (on the potentiometer read device 11). The same slider potential, in particular a slider potential equal to the reference potential, is thus obtained for the lower end position of the slider 19, i.e. for the zero position of the slider 19, independently of the potentiometer resistance 16 of the potentiometer 12 connected to the potentiometer read device 11, i.e. independently of the nominal value. The same zero point is always obtained for potentiometers with different nominal values.
The expression that the potentiometer reading device 11 fixedly sets the reference potential refers in particular to the aspects discussed above: the reference potential is independent of the potentiometer resistance 16 (especially if the total resistance of the potentiometer 12 is in the range of 3 kOhm to 80 kOhm). The potentiometer read-out device 11 is preferably designed to provide the same reference potential for each determination of the potentiometer value, i.e. in particular for each detection of the slider potential.
The potentiometer read-out device 11 preferably comprises a voltage follower (spannungsfolder) 36 for providing a reference potential. The output of the voltage follower 36 is connected, in particular directly connected, to the lower terminal point 22. The potentiometer read-out device 11 outputs a reference potential using the output terminal of the voltage follower 36. The potentiometer read-out device 11 preferably comprises a first voltage divider, which participates in providing a reference potential. In particular, the potentiometer read-out device comprises a supply output 25 for supplying a main supply potential from which a reference potential is derived by means of a first voltage divider. Exemplarily, the first voltage divider provides a partial potential, which is supplied to the input of the voltage follower 36, and the voltage follower 36 provides a reference potential at its output based on the partial potential. In particular, the voltage follower 36 provides a reference potential such that the reference potential is equal to the partial potential.
The potentiometer read out device 11 exemplarily comprises a control unit 24. The control unit 24 preferably has a supply output 25, a first input 26 and/or a second input 27. The sliding contact terminal 23 is connected to the second input 27, in particular directly to the second input 27. The control unit 24 is implemented, for example, as a microcontroller. The control unit 24 expediently has one or more analog-digital converters in order to detect the potential applied at the first input 26, typically the supply potential, and/or the potential applied at the second input 27, typically the slider potential.
The potentiometer read-out device 11 is designed to provide a main supply potential and, as an example, a main supply potential at the supply output 25. The supply output 25 is exemplarily electrically connected, in particular directly electrically connected, to the first circuit node 28.
The potentiometer read-out device 11 comprises a first voltage divider, which exemplarily has a first resistance 31 and a second resistance 32. The first voltage divider is expediently connected between the supply output 25 of the potentiometer read-out device 11, in particular the first circuit node 28, and the second circuit node 33, in particular ground 34, in particular directly between the supply output 25 of the potentiometer read-out device 11, in particular the first circuit node 28, and the second circuit node 33, in particular ground 34. The first voltage divider has a third circuit node 35, which is arranged between the first resistor 31 and the second resistor 32. The first voltage divider provides a partial potential at a third circuit node 35.
The voltage follower 36 suitably comprises an operational amplifier 37. The positive input of the operational amplifier 37 represents the input of the voltage follower 36. The output of the operational amplifier represents the output of the voltage follower 36. Operational amplifier 37 is connected with its positive input to third circuit node 35, in particular directly to third circuit node 35. The negative input of the operational amplifier 37 is connected to the output of the operational amplifier 37, in particular directly to the output of the operational amplifier 37. The output of the operational amplifier 37 is furthermore connected to the lower terminal point 22, in particular directly to the lower terminal point 22. An input of the voltage follower 36 is connected to the third circuit node 35 and an output of the voltage follower 36 is connected to the lower terminal point 22. The voltage follower 36 is designed to provide a reference potential at the lower terminal 22, which is equal to a partial potential provided by the first voltage divider.
The potentiometer read-out device 11 is preferably designed to detect a fault, in particular a line interruption, if the sliding contact Potential is lower than a reference Potential and/or equal to ground Potential/ground Potential (einem/dem mask-Potential). In particular, the potentiometer read device 11 is configured to detect: the sliding contact potential is smaller than the reference potential and/or equal to/said ground potential, and a fault message is generated and/or output on the basis of the detection. For example, the potentiometer read-out device 11 is configured to compare the slider potential with a threshold value, for example equal to or lower than the reference potential, and to generate and/or output a fault message in response to the comparison resulting in the slider potential being lower than the threshold value. The potentiometer read-out device 11 is expediently designed to take into account the potential applied at the first input 26, i.e. the supply potential, when generating the fault message and to generate the fault message in response to the supply potential being equal to the main supply potential output at the supply output 25: the potentiometer is not connected to the potentiometer reading device 11.
The supply potential is preferably related to the total resistance of the potentiometer. For example, a larger supply potential results with a larger total resistance of the potentiometer than with a smaller total resistance of the potentiometer.
The potentiometer reading device 11 is designed to detect the supply potential and to take it into account when determining the potentiometer value. The potentiometer read-out device 11 preferably detects the supply potential with respect to ground potential, i.e. in particular as a voltage between the supply potential and ground potential. This voltage shall also be referred to as supply voltage.
The potentiometer reading device 11 is in particular designed to calculate a potentiometer value on the basis of the sliding contact potential, in particular the sliding contact voltage, the reference potential, in particular the reference voltage, and the supply potential, in particular the supply voltage. For example, to determine the potentiometer value, the potentiometer read-out device 11 calculates a reference potential, in particular a reference voltage, from the slider potential, in particular the slider voltage, and/or from the supply potential, in particular the supply voltage, and makes the reference potential, in particular the reference voltage, thus obtained proportional to the supply potential, in particular the supply voltage, thus obtained (ins verh ä ltnis zu). For example, the potentiometer read-out device 11 calculates a first difference between the slider potential and the reference potential, in particular, between the slider voltage and the reference voltage, and calculates a second difference between the supply potential and the reference potential, in particular, between the supply voltage and the reference voltage, and calculates the potentiometer value based on a ratio of the first difference to the second difference.
The potentiometer read-out device 11 is preferably designed to derive the supply potential from the main supply potential by means of a second voltage divider. The potentiometer read-out device 11 has, as an example, a third resistor 38, and, in the state in which the potentiometer 12 is connected to the potentiometer read-out device 11, a second voltage divider is formed by the third resistor 38 and the potentiometer resistor 16.
In an exemplary manner, the third resistor 38 is connected between the supply output 25, in particular the first circuit node 28, and the upper terminal point 21, in particular the fourth circuit node 39, in particular directly between the supply output 25, in particular the first circuit node 28, and the upper terminal point 21, in particular the fourth circuit node 39. The supply potential derived by the second voltage divider is applied to the upper terminal 21, in particular to the fourth circuit node 39. The fourth circuit node 39 is connected to the first input 26, in particular directly to the first input 26. The potentiometer read-out device 11, in particular the control unit 24, is designed to detect the supply potential via the first input 26.
The potentiometer read-out device 11 is designed to take a power saving mode (strompsarmodus) as a function of the supply potential. The supply potential depends on the potentiometer resistance 16, so that the potentiometer read-out device 11 can deduce the resistance value of the potentiometer resistance 16 from the detected supply potential. The current consumption, in particular the energy consumption, of the potentiometer read-out device 11 can depend on the resistance value of the potentiometer resistance 16. For example, a greater current may be drawn from the potentiometer read device 11 with a potentiometer resistance 16 having a lower resistance value than with a potentiometer resistance 16 having a larger resistance. In order to prevent excessive currents from being drawn in the case of a potentiometer resistance 16 having a low resistance, which would lead to an excessively high energy consumption, the potentiometer read-out device 11 is preferably designed to adopt the power saving mode if the potentiometer read-out device 11 recognizes from the supply potential that a potentiometer resistance 16 having a low resistance value, i.e. a resistance value below a resistance threshold value, is present. If the potentiometer read-out device 11 recognizes from the supply potential that there is a potentiometer resistance having a non-low or large resistance value, i.e. for example a resistance value above a resistance threshold value, the potentiometer read-out device 11 does not adopt the power saving mode.
Exemplarily, the potentiometer reading device 11 is configured for performing a comparison with a threshold value based on the detected supply potential and selectively employing or not employing the power saving mode based on the comparison. For example, the potentiometer reader 11 compares the detected power supply potential with a threshold value, and adopts the power saving mode in response to the power supply potential being less than the threshold value, and does not adopt the power saving mode in response to the power supply potential being greater than the threshold value.
The potentiometer read-out device 11 is preferably designed to provide the supply potential and/or the reference potential in a pulsed manner (gepulse) in the power saving mode and/or to provide the supply potential and/or the reference potential in a non-pulsed manner outside the power saving mode. The supply potential and/or the reference potential are supplied in particular in a pulsed manner by the potentiometer read-out device 11 supplying the supply potential and/or the reference potential in a detection time window in which the potentiometer read-out device 11 detects the slider potential and/or the supply potential to determine a potentiometer value and switching off the supply potential and/or the reference potential at the end of the detection time window. The potentiometer read-out device 11 expediently repeats the detection time window a plurality of times, in particular periodically, and thus repeatedly supplies the supply potential and/or the reference potential. The reference potential and/or the supply potential are provided, for example, in such a way that the potentiometer read-out device 11 provides the main supply potential, in particular in a pulsed manner. The potentiometer read-out device 11 is expediently designed to provide the main supply potential in the detection time window and to switch off the main supply potential at the end of the detection time window in the power-saving mode, and expediently to provide the detection time window and thus the main supply potential repeatedly and/or periodically.
The potentiometer read-out device 11 is preferably designed to set the duration of the detection time window, i.e. the on-time of the supply potential and/or the reference potential, in particular the on-time of the main supply potential, on the basis of the detected supply potential, in particular on the basis of the resistance value of the potentiometer resistance 16.
The potentiometer read-out device 11 is preferably designed to continuously provide the supply potential and/or the reference potential, preferably the main supply potential, outside the power saving mode.
The device 10 can be operated in particular by a method having the following steps: providing a supply potential at the upper terminal point 21, the supply potential being greater than ground potential; fixedly setting (Einstellen) a reference potential at the lower terminal point 22, the reference potential being greater than ground potential; detecting the sliding contact potential applied to the sliding contact terminal point 23; the potentiometer value is determined from the detected slider potential taking into account the reference potential.
The method may further comprise the steps of: the supply potential is detected and taken into account when determining the potentiometer value.
Further, the method may comprise the steps of: the potentiometer 12, which may also be referred to as a first potentiometer, is removed from the potentiometer read out device 11 and/or is separated from the potentiometer read out device 11, and a second potentiometer, which differs from the first potentiometer in its potentiometer resistance, i.e. its nominal value, is connected to the potentiometer read out device 11. For example, the potentiometer resistance of the first potentiometer is at least 1.5 times, at least 3 times, or at least 10 times the potentiometer resistance of the second potentiometer. In this method, the potentiometer reading device 11 suitably performs the following steps to read out the second potentiometer (during connection of the second potentiometer to the potentiometer reading device 11): providing a supply potential at the upper terminal point 21, the supply potential being greater than ground potential; fixedly setting a reference potential at the lower terminal point 22, the reference potential being greater than the ground potential; detecting the sliding contact potential applied to the sliding contact terminal point 23; the potentiometer value of the second potentiometer is determined from the detected potential of the sliding contact, taking into account the reference potential. The method may furthermore comprise the following steps for reading out the second potentiometer: the supply potential is detected and taken into account when determining the potentiometer value of the second potentiometer.
The potentiometer read out device 11 suitably determines the potentiometer value of the first potentiometer and the potentiometer value of the second potentiometer correctly, respectively.
Fig. 2 shows a system 40 with a first potentiometer read-out device 11A, which first potentiometer read-out device 11A is embodied as the potentiometer read-out device 11 described above. The system 40 furthermore comprises a second potentiometer read-out device 11B, which is implemented as the potentiometer read-out device 11 described above. The second potentiometer read out device 11B is suitably embodied in the same structure as the first potentiometer read out device 11A.
The system includes a first potentiometer 12A and a second potentiometer 12B. The two potentiometers differ in their potentiometer resistance, i.e. their nominal value. For example, the potentiometer resistance of the first potentiometer 12A is at least 1.5 times, at least 3 times, or at least 10 times the potentiometer resistance of the second potentiometer 12B. The first potentiometer 12A is connected to the first potentiometer reading device 11A and is read by the first potentiometer reading device 11A. The second potentiometer 12B is connected to the second potentiometer reading device 11B and is read by the second potentiometer reading device 11B. The two potentiometer read-out devices 11A, 11B each provide the same reference potential and, due to the different potentiometer resistances, a different supply voltage is present at each potentiometer 12A, 12B. With the above-described configuration, even if the potentiometers 12A and 12B differ significantly in their potentiometer resistances, the two (structurally identical) potentiometer read-out devices 11A and 11B can each determine the correct potentiometer value.
Other exemplary aspects of the potentiometer read-out device 11 should be set forth below.
A reference voltage, which may also be referred to as a low measurement voltage for the zero point of the potentiometer, is generated by a first voltage divider and an operational amplifier 37. The voltage divided by the first voltage divider is applied as a reference voltage at the lower terminal point to the output of the operational amplifier 37, in particular in a current-amplified manner. The operational amplifier 37 clamps (einklemmen) the lower supply terminal 18 of the potentiometer 12 to a reference voltage that is fixedly above GND, i.e. ground 34, e.g. 0.3V.
The reference voltage is, in particular, independent of the nominal value of the connected potentiometer for a large part (in weiten Teilen), in particular for nominal values of 3 kOhm to 80 kOhm. The potentiometer read-out device 11 suitably has a maximum power consumption of 1 to 2 mW. At low nominal values, the potentiometer 12 is expediently only switched on for a short time (by switching on the main supply potential) during the measurement period until the filter following the second input 26 starts to oscillate (eingeschwungen).
In the case of a potentiometer having a higher nominal value (e.g., 40 kOhm), the potentiometer resistance 16 may affect the start-up characteristics of the EMV protection circuit (not shown). A voltage drop occurs at the third resistor 38, which is inversely proportional to the nominal value of the potentiometer 12. At the upper terminal point 21, a voltage is measured, with which the nominal resistance value of the connected potentiometer 12 can be determined. The potentiometer read-out device 11 controls its on-time, in particular the on-time of the main supply potential, on the basis of the nominal resistance value of the potentiometer 12. In the case of high-resistance potentiometers, the main supply potential is expediently not switched off after the end of the measuring process, i.e. after detection of the slider potential.
The voltage at the lower terminal point 22 is expediently identical and known for all possible nominal values of the potentiometer. The potentiometer read-out device 11 is suitably configured for taking ratio (ratiometric) measurements of the potentiometer 12.
As explained above, the potentiometer 12 is therefore not simply connected to the circuit zero, i.e. ground 34, but is raised with its lower supply terminal 18 to a fixed voltage potential, i.e. a reference potential, greater than 0V.
This is particularly advantageous if potentiometers with high variance (Varianz) should be connected and diagnostic possibilities are required. The potentiometer reading device 11 is therefore suitably able to always identify the zero point of the travel position (Wegstellung) of the potentiometer 12.
The diagnostic function is implemented by inferring a line break in the line "sliding contact terminal point 23" and "first input 26", for example when 0V is measured at the second input 27. If at the same time a non-decreasing value of the main supply potential is measured at the first input 26, it can be concluded that, for example, a potentiometer is not connected.
Thus, as explained above, the potentiometer read-out device 11 is configured to raise the low voltage of the potentiometer 12 to a fixed, known value, independent of its nominal resistance value.
Claims (14)
1. A potentiometer reading device (11) for determining a potentiometer value relating to the position of a sliding contact (19) of a potentiometer (12), characterized in that the potentiometer reading device (11) comprises an upper terminal point (21) for connection to an upper power supply terminal (17) of the potentiometer (12), a sliding contact terminal point (23) for connection to a sliding contact terminal (20) of the potentiometer and a lower terminal point (22) for connection to a lower power supply terminal (18) of the potentiometer (12), wherein the potentiometer reading device (11) is configured for providing a power supply potential at the upper terminal point (21), wherein the potentiometer reading device (11) is furthermore configured for fixedly setting a reference potential at the lower terminal point (22), the reference potential being between a reference potential of the potentiometer reading device (11) and the power supply potential, detecting a sliding contact potential applied on the movable contact sliding terminal point (23) and determining the potentiometer value from the detected sliding contact potential taking into account the reference potential.
2. Potentiometer reading device (11) according to claim 1, characterized in that the reference potential is between a ground potential of the potentiometer reading device (11) and the supply potential.
3. Potentiometer reading device (11) according to claim 1, characterized in that the potentiometer reading device (11) is configured for providing the reference potential independently of the total resistance of the potentiometer (12).
4. Potentiometer reading device (11) according to any of claims 1 to 3, characterized in that the potentiometer reading device (11) is configured for inferring a fault in case of a sliding contact potential between the reference potential and/or equal to the reference potential.
5. The potentiometer read-out device (11) according to claim 4, characterized in that the potentiometer read-out device (11) is configured for interrupting a line interruption in case of a slider potential between the reference potential and/or equal to the reference potential.
6. Potentiometer reading device (11) according to any of claims 1 to 3, characterized in that the supply potential is related to the total resistance of the potentiometer (12).
7. A potentiometer reading device (11) according to any of claims 1-3, characterized in that the potentiometer reading device (11) is furthermore configured for detecting the supply potential and taking the supply potential into account when determining the potentiometer value.
8. Potentiometer reading device (11) according to any of claims 1 to 3, characterized in that the potentiometer reading device (11) is furthermore configured for taking a power saving mode depending on the supply potential.
9. Potentiometer reading device (11) according to claim 8, characterized in that the potentiometer reading device (11) is configured for providing the supply potential and/or the reference potential in a pulsed manner in the power saving mode and/or in a non-pulsed manner outside the power saving mode.
10. Potentiometer reading device (11) according to any of claims 1 to 3, characterized in that the potentiometer reading device (11) comprises a supply output (25) for providing a main supply potential from which the reference potential is derived by means of a first voltage divider.
11. Potentiometer reading device (11) according to any of claims 1 to 3, characterized in that the potentiometer reading device (11) comprises a supply output/the supply output (25) for providing a main supply potential/the main supply potential, the supply potential being derived from the main supply potential by means of a second voltage divider.
12. Potentiometer reading device (11) according to any of claims 1 to 3, characterized in that the potentiometer reading device (11) further comprises a voltage follower (36) for providing the reference potential.
13. An arrangement (10) consisting of a potentiometer reading device (11) according to any of claims 1 to 12 and a potentiometer (12), characterized in that the upper terminal point (21) is connected to an upper supply terminal (17) of the potentiometer (12), the slide contact terminal point (23) is connected to a slide contact terminal (20) of the potentiometer (12) and the lower terminal point (22) is connected to a lower supply terminal (18) of the potentiometer (12).
14. The device (10) of claim 13, wherein the device (10) includes an actuator (14) having an actuator link (15), the actuator link (15) being coupled to a sliding contact (19) of the potentiometer (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021202363.0A DE102021202363A1 (en) | 2021-03-11 | 2021-03-11 | Potentiometer readout device, arrangement and method |
| DE102021202363.0 | 2021-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218158092U true CN218158092U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220525738.XU Active CN218158092U (en) | 2021-03-11 | 2022-03-11 | Potentiometer reading device and arrangement |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN218158092U (en) |
| DE (1) | DE102021202363A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3522775A1 (en) | 1985-06-26 | 1987-01-08 | Daimler Benz Ag | Device for determining the contact resistance on the slider of a potentiometer |
| DE3634051A1 (en) | 1986-10-07 | 1988-04-21 | Philips Patentverwaltung | METHOD FOR DETERMINING THE POSITION OF THE TAP OF A RESISTANCE TRANSMITTER |
| DE3932484C2 (en) | 1989-09-28 | 1995-07-20 | Siemens Ag | Arrangement for detecting the position of an actuator and method for starting up such an arrangement |
| EP0489957B1 (en) | 1990-12-12 | 1993-07-07 | Siemens Aktiengesellschaft | Circuit for measuring the steering position of the rear wheels of a motorcar |
| DE202010017499U1 (en) | 2010-06-16 | 2012-02-09 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt | Device for determining the parking position of a motor-driven actuating element of a motor vehicle |
| DE102015108767A1 (en) | 2015-06-03 | 2016-12-08 | Borgward Trademark Holdings Gmbh | Device and method for oil level detection, vehicle and tank |
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2021
- 2021-03-11 DE DE102021202363.0A patent/DE102021202363A1/en active Pending
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- 2022-03-11 CN CN202220525738.XU patent/CN218158092U/en active Active
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| DE102021202363A1 (en) | 2022-09-15 |
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