EP4189708A1 - Rheostat - Google Patents
RheostatInfo
- Publication number
- EP4189708A1 EP4189708A1 EP21752083.2A EP21752083A EP4189708A1 EP 4189708 A1 EP4189708 A1 EP 4189708A1 EP 21752083 A EP21752083 A EP 21752083A EP 4189708 A1 EP4189708 A1 EP 4189708A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistive
- tube
- rheostat
- switch
- inter
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 13
- 240000008100 Brassica rapa Species 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 3
- 238000013475 authorization Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/30—Adjustable resistors the contact sliding along resistive element
- H01C10/301—Adjustable resistors the contact sliding along resistive element consisting of a wire wound resistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/16—Adjustable resistors including plural resistive elements
- H01C10/20—Contact structure or movable resistive elements being ganged
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/30—Adjustable resistors the contact sliding along resistive element
- H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/50—Adjustable resistors structurally combined with switching arrangements
Definitions
- the present invention relates to an ohmic conductor whose resistance can be varied, otherwise known as a rheostat.
- Rheostats are used to vary the ohmic value of a resistive element, in particular in the case of loads used for testing electrical sources.
- the rheostats are often replaced by electronic loads which are electronic circuits which adjust the intensity which they absorb to the value of tension which is put at their terminals to appear like resistive dipoles of an ohmic value that can easily be ordered.
- These electronic loads have advantages in terms of precision, ease of adjustment, control by communication in digital form with external controllers.
- rheostats have advantages that lead them to still be used to this day, in particular the fact that their resistive circuit is made with passive resistive conductors and therefore does not have the characteristics of distortion and sensitivity to electromagnetic disturbances of electronic circuits. .
- the rheostat therefore has a reliability and a precision of ohmic value greater than the electronic loads mentioned previously.
- a rheostat comprising several resistive windings makes it possible to obtain modular rheostats whose ohmic resistances can, according to certain configurations, be higher than those of conventional rheostats using a single resistive winding.
- the latter can be arranged in parallel.
- the resistive windings are electrically connected in parallel
- one of the drawbacks lies in particular in that they have limited adjustment dynamics linked to the movement of a cursor along the resistive windings.
- such an assembly of the resistive windings in parallel proves to be complex and expensive to produce.
- the object of the present invention is therefore to improve the structure and operation of a rheostat and in particular to increase its ohmic value while simplifying its design.
- the invention also makes it possible to reduce the production cost of the rheostat while allowing its operation in direct or alternating current, for the same rheostat.
- the invention also has the advantage of optimizing the method making it possible to vary the ohmic resistance of the rheostat while increasing the service life of the latter.
- the invention relates to a rheostat comprising at least one electrical input and one electrical output, the rheostat comprising at least a first resistive tube and a second resistive tube electrically arranged in series with respect to each other and on each of which a slider circulates, the electrical input being connected to the first resistive tube and the electrical output being connected to at least one of the sliders, a first switch and a second switch being arranged between each of the sliders, respectively of the first resistive tube and of the second resistive tube and the electrical output, characterized in that the rheostat comprises an inter-tube connection point arranged between a start of the second resistive tube and an end of the first resistive tube, the rheostat being configured to allow contact of the sliders at the level of the inter-tube connection point as well as a change of state of the first switch and of the second switch when the cursors are placed at the inter-tube connection point.
- Resistive tubes are composed of at least one ceramic tube and an electric winding on which the slider circulates. The movement of the cursor along the electrical winding of the resistive tube then makes it possible to vary the ohmic value of the rheostat.
- the inter-tube connection point it is understood from the arrangement of the inter-tube connection point that the resistive tubes of the rheostat are arranged head to tail from each other, thus making it possible to electrically connect the end of the first resistive tube with the start of the second resistive tube.
- the inter-tube connection point then corresponds to a point between the resistive tubes with zero potential difference, the contact of the slider with said inter-tube connection point therefore having the advantage of limiting the generation of electric arcs which may eventually decrease the life of said switch.
- Advantage is taken of such a configuration of the rheostat in that it allows the use of switches at a lower cost, while exploiting the rheostat in direct or alternating current, without modifications of the switches.
- each of the first resistive tube and of the second resistive tube can be replaced by a group of several resistive tubes whose electrical windings are connected in parallel.
- all of the resistive tubes of a group of tubes is traversed by a plurality of cursors connected to the same electrical potential.
- each of the groups of tubes that the rheostat comprises can comprise a number of tubes different from each other, within the same rheostat.
- the rheostat comprises at least one box in which are arranged at least the first resistive tube, the second resistive tube and a third resistive tube, each of the resistive tubes being arranged head to tail with respect to an adjacent resistive tube of such that at least one start of one of said resistive tubes is opposite an end of another resistive tube, the first resistive tube, the second resistive tube and the third resistive tube being electrically arranged in series with each other relation to others.
- first inter-tube connection point at a first end of the second resistive tube and a second inter-tube connection point at a second end of the second resistive tube, the first inter-tube connection point being connected to one end of the first resistive tube while the second inter-tube connection point is connected to a start of the third resistive tube.
- the rheostat comprises at least one switch control unit and at least two sensors capable of determining the position of the cursor on its resistive tube, the two sensors being able to transmit the position of the cursor to the control unit switches.
- a first sensor is then positioned in the rheostat so that it faces the start of at least one of the resistive tubes of the rheostat while a second sensor is positioned opposite the end of said resistive tube, in the direction movement of the cursor assigned to the tube.
- at least one of the first sensor or of the second sensor is capable of detecting the position of the cursor at the level of at least one of the inter-tube connection points of the rheostat and thus transmitting this position to the control unit of the switches, so as to authorize the switching of the switch(es), if necessary.
- the sliders of each of the resistive tubes are mechanically linked to each other such that they move simultaneously along their respective resistive tube.
- the set of cursors associated with each of the resistive tubes then forms a group of mobile cursors of the rheostat, moving identically along their respective resistive tube.
- the switch is an electromechanical relay or an electronic switch, that is to say for example one or more transistors.
- the switch fear wanders a position memory relay with at least two coils, or in other words a latching or bistable relay, that is to say a relay which retains its open or closed position when it is is off.
- a last resistive tube of the series of resistive tubes is electrically connected to the electrical output by means of a switch.
- the switch makes it possible in particular to connect the end of the last resistive tube of the series of resistive rubes directly to the electrical output of the rheostat. It is then understood that the inrerrupreur allows on the one hand an output of the electric current out of the rheostat according to a maximum resistance of the latter and on the other hand makes it possible to interrupt the flow of electric current in the resistive rubes when the sliders are arranged on an inter-tube connection point.
- the rheostat may comprise at least one safety relay positioned between the electrical input and the electrical output, the safety relay being hard to interrupt or authorize a flow of current through the series of resistive rubes.
- the safety relay is positioned between the input of the rheostat and the first resistive tube of the rheostat dir and makes it possible at least to cut off a power supply to the resistive rubes during a malfunction of the rheostat. More specifically, when detecting a malfunction of the rheostat, the control unit cuts off the electrical supply to the resistive rubes by means of the safety relay. In a connected configuration, the switch fear then wanders a position memory relay with two coils, or otherwise say a latching or bistable relay. According to another example of the invention, the switch can bring the cursor to the level of the inter-tube connection point before switching the switch, in order to limit the damage to the switch. In this last configuration, the switch corresponds to a relay without latching.
- the rheostat comprises at least one member for motorized displacement of the cursors.
- the motorized movement member therefore makes it possible to move the group of movable cursors along the resistive tubes in order to vary the resistance of the rheostat.
- the device for simultaneously moving the sliders can be manually operated.
- the invention also relates to a method for controlling a rheostat according to the preceding characteristics, during which the switch is switched when at least one of the cursors is positioned at the level of the inter-tube connection point.
- a low potential difference can be obtained in particular by sizing the switches and means a value between 0 and 20 V.
- the first switch and the second switch are both switched when the sliders associated with them are positioned at the inter-tube connection point.
- switching of the switch is prevented when at least one of the cursors is positioned outside the inter-tube connection point or points.
- the first sensor or the second sensor is capable of determining whether the cursor is positioned at the level of the inter-tube connection point, said sensors thus transmitting the position of said cursor to the switch control unit which manages the switching of the switch .
- the control unit blocks the switching of the switch, thus preventing its interruption operation or the authorization of the passage of electric current through the slider associated with the switch.
- the electric current flows at least partially through the first resistive tube when the first switch is closed. In such a case, the first switch is on.
- the first switch is associated with the slider of the first resistive tube and that when the latter is closed, the other switches of the rheostat are open.
- the current crosses both in part the first resistive tube and its associated slider up to the electrical output of the rheostat, the other open switches preventing the electrical flow in the sliders with which they are associated.
- the electric current flows through the first resistive tube and at least part of the second resistive tube when the first switch is open and the second switch is closed.
- the second switch is electrically connected to the slider of the second resistive tube.
- the current flows in the first resistive tube without crossing the cursor of said first resistive tube and then travels at least in part through the second resistive tube, passing through the inter-tube connection point, then passes through the slider of said second resistive tube to wander brought to the electrical output of the rheostat.
- FIG 1 is a general perspective view of a rheostat according to the invention comprising at least two resistive tubes;
- FIG 2 is an electrical diagram of the rheostat of Figure 1 according to a first embodiment of the invention
- FIG 3 is an electrical diagram of the rheostat of Figure 1 according to the first embodiment of the invention in which at least one slider is positioned at the start of one of the resistive tubes;
- FIG 4 is an electrical diagram of the rheostat of Figure 1 according to the first embodiment of the invention in which the at least one slider is positioned at one end of the resistive tube;
- FIG 5 is an electrical diagram of the rheostat of Figure 1 according to a second embodiment of the invention.
- FIG. 1 illustrates a rheostat 1 according to the invention comprising at least one box 2 in which are housed a plurality of resistive tubes 4.
- the rheostat 1 according to the invention is a rectilinear type rheostat 1 which can be used as a variable load for perform device tests or programmed battery discharges for their maintenance.
- the plurality of resistive tubes 4 of the rheostat 1 then constitutes the linear resistance of the rheostat 1 and each of the resistive tubes 4 comprises at least one ceramic tube surrounded by an electric winding intended to be traversed by the electric current and used to vary the resistance of rheostat 1.
- each of the resistive tubes 4 comprises an associated maximum resistance, the total resistance of the rheostat 1 being the sum of the resistances of each of the resistive tubes 4.
- the rheostat 1 makes it possible to vary the intensity of the electric current which comes out of it . More precisely, the intensity of the electric current varies as the latter passes from one resistive tube 4 to the other, that is to say when the ohmic value of rheostat 1 varies.
- an electrical input 8 of the rheostat and an electrical output 10 of said rheostat are defined.
- the electrical input 8 of the rheostat 1 makes it possible to ensure the entry of the electrical current into the rheostat 1 so that the latter travels through at least part of the plurality of resistive tubes 4 of the rheostat 1, then leaves the latter via its output. 10.
- the resistive tubes 4 of the plurality of resistive tubes 4 are then arranged in series with each other, so that an end 12 of a resistive tube 4 is electrically connected to the beginning 14 of another tube resistive 4.
- the resistive tubes 4 are arranged superimposed on each other in the casing of the rheostat and in such a way that the adjacent resistive tubes are arranged head to tail with respect to each other, the resistive tubes 4 nevertheless being connected electrically in series with each other.
- each of the groups of resistive tubes can comprise a number of resistive tubes different from each other, within the same rheostat. It is also understood that several cursors move over all of the resistive tubes making up each of the groups of tubes, and that these cursors are connected to the same electrical potential.
- a first resistive tube 4a and a second resistive tube 4b of the rheostat 1 are defined, each comprising a beginning 14 of the tube and an end 12 of the tube, electrically connected by an inter-tube connection point 16.
- the beginning 14a of the first resistive tube 4a is then electrically connected to the electrical input 8 of the rheostat 1, while the end 12a of the first resistive tube 4a is electrically connected to the beginning 14b of the second resistive tube 4b.
- the electrical connection made between the first resistive tube 4a and the second resistive tube 4b then constitutes a first inter-tube connection point 16a.
- a second inter-tube connection point 16b is also defined located between an end 12b of the second resistive tube 4b and a start 14c of a third resistive tube 4c.
- a third inter-tube connection point 16c is also arranged between an end 12c of the third resistive tube 4c and a start I4d of a fourth resistive tube 4d.
- a fourth inter-tube connection point I6d is arranged between an end 12d of the fourth resistive tube 4d and a start 14e of a fifth resistive tube 4e.
- inter-tube connection points 16 make it possible to constitute switching points with low or zero potential difference and also allow the use of a switch at lower cost while exploiting the rheostat in direct current or alternative.
- the use of the inter-tube connection points will be explained later in the following detailed description.
- a first slider 6a and a second slider 6b circulate respectively against the first resistive tube 4a and against the second resistive tube 4b.
- the first slider 6a is then able to move along the first resistive tube 4a between its start 14a and its end 12a.
- the second slider 6a is able to move on the second resistive tube 4b between its start 14b and its end 12b.
- Rheostat 1 includes as many sliders 6 as it does resistive tube and according to the example described here, rheostat 1 includes five resistive tubes 4 and five sliders 6.
- the first slider 6a and the second slider 6b, and any other sliders are mechanically linked together, so that they move simultaneously along the first resistive tube 4a and the second resistive tube 4b respectively.
- the rheostat 1 then also comprises at least one motorized displacement member 18 of the group of mobile sliders 60 capable of allowing the movement of the latter along the resistive tubes 4.
- Slider 6 is a wiper which provides electrical contact on the winding of the resistive tube, and through which the electric current passes to bypass part of this winding.
- the rheostat 1 comprises at least one switch 20 disposed between at least one of the sliders 6 and the electrical output 10 of the rheostat.
- the switch 20 has for function of connecting or disconnecting the slider 6 of the resistive tube 4 with which it is associated with the electrical output 10 of the rheostat, depending on whether said switch 20 is closed or open.
- the switch 20 can take the form of an electromechanical relay, in particular with two coils and corresponds to a latching or bistable relay.
- Switch 20 can also take the form of an electronic relay, that is to say using one or more transistors.
- Each of the switches can take the form of a position memory relay fitted with two coils to ensure that electrical contact is maintained at the level of the switch and thus avoid the formation of an electric arc when the power is turned back on.
- a first switch 20a is arranged between the first slider 6a and the electrical output 10 of the rheostat 1 and a second switch 20b is arranged between the second slider 6b and the electrical output 10 of the rheostat 1 It is therefore understood from the above that the first switch 20a is able to allow the flow of electric current through the first slider 6a, while the second switch 20b is able to allow the flow of electric current through the second slider 6b .
- the rheostat 1 comprises at least one control unit 22 of said switches 20.
- At least two sensors 24 are integral with the box 2 of the rheostat, so that they face the start 14 and the end 12 of the resistive tubes 4. More specifically, a first sensor 24a is positioned opposite the start 14a of the first resistive tube 4a and a second sensor 24b is positioned opposite the end 12a of said first resistive tube 4a, each of the first sensor 24a and of the second sensor 24b being capable of determining the position of the cursors 6 of the group of mobile cursors 60.
- At least one contact member 25 is positioned at one end of the group of movable sliders 60 such that said contact member 25 is capable of cooperating by contact or magnetically with the sensors 24 previously mentioned and as is particularly visible in Figures 3 and 4.
- the conracr member 25 cooperates with the first sensor 24a in order to indicate to the control unit 22 the position of the group of movable cursors 60 with respect to the resistive tubes 6. This position here corresponds to the start 12a of the first resistive tube 6a, at the second inter-tube connection point 16b and at the fourth inter-tube connection point I6d.
- the group of movable sliders 60 is hard to move in the direction of the end 12a of the first resistive tube 6a to connect so that the contact member 25 cooperates with the second sensor 24b, this cooperation indicating to the control unit 22 the position of the group of movable cursors 60 at the level of the end 12a of the first resistive tube 6a, of the first inter-tube connection point 16a and of the third inter-tube connection point -16c tubing.
- Each of the first sensor 24a and of the second sensor 24b is then able to transmit the position of the first cursor 6a, and of the other cursors 6 included in the group of mobile cursors 60, through contact with the contact member 25, to the control unit 22 of the switches 20.
- the control unit 22 orders the opening or closing of one of the switches 20 according to the position of the cursor 6 received by the sensors 24. It is understood from the above that, in the case of the first resistive tube 4a, the second sensor 24b is keen to detect the position of the first slider 6a at the level of the first inter-tube connection point 16a as previously mentioned.
- the rheostat may comprise a plurality of sensors arranged on the plurality of resistive tubes, at each of their beginning and their end. We then understand that in a connected configuration, the contact of each of the sliders against one of the sensors positioned on one of the resistive tubes of the rheostat indicates the position of the said slider to the control unit.
- the rheostat 1 is configured to authorize a conracr of the slider 6 of one of the resistive tubes 4 at the level of one of the inter-tube connection points 16.
- the switching of the switch 20 from one position closed to an open position, and vice versa is performed only at the inter-tube connection point 16 corresponding to a point of low or zero potential difference.
- At least one safety relay 26 is positioned between the electrical input 8 and the electrical output 10 of the rheostat 1, the safety relay 26 being able to interrupt the flow of electric current in the resistive tubes 4 of the rheostat 1 More precisely, the safety relay 26 is positioned between the electrical input 8 of the rheostat 1 and the first resistive tube 4a and has the function of preventing the passage of electrical current in the resistive tubes 4 of the rheostat 1 in the event of malfunction of the rheostat 1 or even during an involuntary interruption of the operation of the rheostat 1. In these cases, the control unit 22 interrupts the power supply to the resistive tubes 4 by means of the safety relay 26 turn keeping the switches in their position.
- the last resistive strip 4 of the series of resistive tubes 4 of the rheostat is electrically connected to the electrical output 10 by means of a switch 28. More precisely, the switch 28 electrically connects a 12th end of the fifth resistive strip 4th to the electrical output 10. It is then understood that the switch 28 allows on the one hand, when it is in a closed position, to use the rheostat in its maximum resistance since all the resistive tubes of the series of resistive tubes are traversed by the electric current, and allows on the other hand, when it is open, to prohibit this circulation, in particular when the sliders 6 are arranged on one of the inter-tube connection points 16a, 16b.
- a collar 30 fear wanders positioned at the 12th end of the fifth resistive rube 4th.
- the collar 30 has the function of allowing the circuit of the rheostat 1 to be interrupted when a fifth slider 6th of the fifth resistive rube 4th is brought into contact with said collar 30 by the control unit 22.
- the collar 30 is an electrically insulator mounted at the end of the last resistive rube and on which the 6th slider can rub, thus interrupting the flow of current in the series of resistive tubes 4.
- An interruption link occurs when the sliders 6 are placed on the first and third point of inter-tube connection 16a, 16c, the flow of current in the last slider will then be prevented by the collar 30.
- bistable switches thus making it possible to dispense with the safety relay mentioned above.
- a first step of the process consists in moving one of the cursors 6 of one of the resistive tubes 4 according to the desired resistance of the rheostat 1, that is to say according to the intensity of the electric current desired at the output. 10 of the rheostat 1.
- the control unit 22 of the switches 20 then has the function on the one hand of determining which slider 6 associated with one of the resistive tubes 4 is to be moved and its position on the resistive tube 4 to obtain the resistance requested. Once this determination has been made, the control unit 22 generates a command instruction to the motorized displacement member 18 of the sliders 6 so that the latter brings the previously identified slider 6 to one of the inter-tube connection points 16 of the resistive tube 4 associated with said slider 6.
- one of the sensors 24 of the rheostat 1 determines that said slider 6 is in position at the level of the inter-tube connection point 16 by means of cooperation with the contact member 25 carried by the group of moving cursors 60 and transmits this information to the control unit 22 of the switches 20.
- the control unit 22 of the switches 20 switches the switch 20 associated with the previously identified slider 6 to position it in a closed state so that the electric current passes through at least one of the resistive tubes 4 arranged between the electrical input 8 and said slider 6, then joins the electrical output 10 of the rheostat 1.
- a connection connects switching to an open state or a closed state esr illustrated by the reference 29 in Figures 3 and 4.
- the unit control 22 generates a control instruction to the motorized displacement member 18 so that the latter brings the cursor 6 identified to a point on the resistive tube 4 corresponding to the desired resistance.
- the desired resistance is obtained at the electrical output 10 of the rheostat 1 without the switching of the switch 20 forming an electric arc which could eventually damage it.
- the control unit 22 determines whether a new slider must be used, which must be the new slider 6 used as well as its position on its associated resistive tube 4 to obtain the new desired resistance.
- the control unit 22 generates a command instruction to the motorized displacement member 18 of the sliders 6 in order to bring the slider 6 previously used during the first step at the inter-tube connection point 16 of the resistive tube 4 identified above.
- the control unit 22 switches the switch 20 associated with the cursor 6 of the first step, here in an open position, in order to prevent the passage of electric current in said cursor 6 with which it is associated.
- control unit 22 switches the switch 20 associated with said new slider 6 into a closed position in order to authorize the passage of electric current in the resistive tubes 4 between the electrical input 8 and said new slider 6.
- the confirmation of the position of this new cursor 6 on an inter-tube connection point can be obtained by the detection operated by one of the position sensors 24 following contact with the contact member 25 carried by the group of mobile cursors 60, as mentioned previously.
- control unit 22 generates a command instruction to the motorized displacement member 18 so that the latter brings the new cursor 6 identified during the fourth step to the point on its resistive tube 4 making it possible to obtain the new desired resistance.
- each of the resistive tubes of the rheostat has a resistance of fifty ohms, this value being given by way of example and can be different and distinct for each of the resistive tubes of the rheostat.
- the control unit 22 of the switches 20 determines during the first step, which pair of resistive tube 4 and slider 6 should be used to obtain this resistance of twenty-five ohms.
- the control unit 22 determines that the first cursor 6a of the first resistive tube 4a must be positioned approximately equidistant from the start 14a and the end 12a of the first resistive tube 4a.
- the control unit 22 generates a command instruction to the motorized displacement member 18 so that the latter brings the first cursor 6a to the first inter-tube connection point 16a positioned at the end 12a of the first resistive tube 4a .
- the control unit 22 switches (arrow 29) the first switch 20a to a closed position. In this way, the electric current passes through the first resistive tube 4a until its end 12a, then the first slider 6a to arrive at the electrical output 10 of the rheostat 1.
- control unit 22 generates a command instruction to the motorized displacement member 18 so that the latter brings the first cursor 6a to the middle of the first tube 4a.
- a rheostat 1 having a resistance of twenty-five ohms is obtained without having produced electric arcs when switching the switch 20.
- the control unit 22 In the case where it is desired to modify the resistance of the rheostat 1 previously established at twenty-five ohms, for a resistance of two hundred and twenty-five ohms, the control unit 22 generates a control instruction to the displacement member motor 18 so that it brings the first slider 6a to the first inter-tube connection point 16a of the first resistive tube 4a. Once the first inter-tube connection point 16a has been reached by the first slider 6a, the second sensor 24b transmits the information to the control unit 22 of the switches 20 so that it switches the first switch 20a into an open position.
- control unit 22 determines the new resistive tube 4 - slider 6 pair to be used, as well as the position of said slider 6 on its associated resistive tube 4, in order to obtain the resistance of two hundred and twenty-five ohms. generated by the rheostat 1. In the present case and for resistive tubes each of fifty ohms, it is the fifth slider 6th and the fifth resistive tube 4th.
- the control unit 22 then generates a command instruction to the displacement member motor 18 so that it brings the fifth slider 6th to the fourth inter-tube connection point I6d of the fifth resistive tube 4th, here located at the start 14th of the latter.
- the first sensor 24a then confirms the position of the fifth cursor 6e at the level of the fourth inter-tube connection point I6d of said fifth resistive tube 4e and transmits this information to the control unit 22.
- the control unit 22 can switch the fifth switch 20th of the fifth resistive tube 4th in a closed position so that the electric current passes through all of the resistive tubes 4 positioned between the electrical input 8 and the fifth slider 6th.
- control unit 22 generates a new command instruction to the motorized movement member 18 so that the latter brings the fifth cursor 6e equidistant from the start 14e and the 12th end of the fifth 4th resistive tube, making it possible to obtain the desired resistance of two hundred and twenty-five ohms. This result is illustrated in Figure 2.
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2008072A FR3113177B1 (en) | 2020-07-30 | 2020-07-30 | Rheostat |
PCT/FR2021/051357 WO2022023644A1 (en) | 2020-07-30 | 2021-07-21 | Rheostat |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4189708A1 true EP4189708A1 (en) | 2023-06-07 |
Family
ID=75108358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21752083.2A Pending EP4189708A1 (en) | 2020-07-30 | 2021-07-21 | Rheostat |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4189708A1 (en) |
FR (1) | FR3113177B1 (en) |
WO (1) | WO2022023644A1 (en) |
Family Cites Families (4)
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JPS593529Y2 (en) * | 1980-09-13 | 1984-01-31 | アルプス電気株式会社 | variable resistor |
KR101174634B1 (en) * | 2010-07-26 | 2012-08-20 | 삼성전자주식회사 | The variable gain amplifier and the variable cutoff frequency filter which use linear-in-db programable resistors |
EP3559965B1 (en) * | 2016-12-20 | 2020-12-16 | Supergrid Institute | Dc high-voltage electrical installation and method for controlling a switching device in such an installation |
CN111403136B (en) * | 2020-05-09 | 2024-06-25 | 广州海关技术中心 | Graphite short-circuit resistance box |
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2020
- 2020-07-30 FR FR2008072A patent/FR3113177B1/en active Active
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2021
- 2021-07-21 EP EP21752083.2A patent/EP4189708A1/en active Pending
- 2021-07-21 WO PCT/FR2021/051357 patent/WO2022023644A1/en active Application Filing
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Publication number | Publication date |
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FR3113177A1 (en) | 2022-02-04 |
FR3113177B1 (en) | 2022-07-29 |
WO2022023644A1 (en) | 2022-02-03 |
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