CN111627629A - Electronic rotary switch and electric continuous heater - Google Patents
Electronic rotary switch and electric continuous heater Download PDFInfo
- Publication number
- CN111627629A CN111627629A CN202010129131.5A CN202010129131A CN111627629A CN 111627629 A CN111627629 A CN 111627629A CN 202010129131 A CN202010129131 A CN 202010129131A CN 111627629 A CN111627629 A CN 111627629A
- Authority
- CN
- China
- Prior art keywords
- circuit board
- rotary switch
- actuating element
- latching
- electronic rotary
- 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.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/10—Adjustable resistors adjustable by mechanical pressure or force
- H01C10/12—Adjustable resistors adjustable by mechanical pressure or force by changing surface pressure between resistive masses or resistive and conductive masses, e.g. pile type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/30—Adjustable resistors the contact sliding along resistive element
- H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path
- H01C10/36—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path structurally combined with switching arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/14—Adjustable resistors adjustable by auxiliary driving means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
Abstract
The present invention relates to an electronic rotary switch, comprising: a circuit board, a potentiometer arranged on the circuit board in a printed assembly manner, the potentiometer having a sliding contact which can be moved in a rotating manner, wherein the actuating element comprises at least one latching element on the circumference thereof at the height of the circuit board and the circuit board has a plurality of latching recesses in the region of the through recesses, the latching recesses being designed such that, when the actuating element is actuated in a rotating manner, the at least one latching element of the actuating element latches in a latching position in at least one of the latching recesses of the circuit board; and a control circuit, which is provided to measure the variable resistance of the potentiometer as a function of the detent positions and to determine a respective detent position for each of the detent positions by means of a preset value for the resistance value and to provide the respective detent position as a rotary switch position signal. Furthermore, the invention relates to a continuous heater with such a rotary switch.
Description
Technical Field
The present invention relates to an electronic rotary switch.
Furthermore, the invention relates to an electrically continuous heater comprising at least one control electronics, a channel assembly with at least one electrically heatable heating channel.
Background
Rotary switches are used in many devices in electrical technology. In general, these are electromechanical components, in which the different switching states are set by means of a mechanical rotary motion. Such rotary switches usually comprise a fixed contact set and a further contact set arranged in a rotationally movable manner relative thereto about a switch rotation axis, so that different contact states are achieved by changing the rotational position.
In addition to electromechanical rotary switches, electronic rotary switches are also known in which no contact set is used, but in which the respective rotary switch position is detected electrically, magnetically or optically. Such an electronic rotary switch is known, for example, from DE 102008002407 a 1. This document discloses an electronic rotary switch which is arranged on a circuit board and comprises at least one contact switch zone which establishes a corresponding electrical contact connection in different rotational positions with an elastic switch pad which can be rotated by an actuating element.
Another rotary actuator is known from DE 102004020827 a 1. The position of the rotary actuator is analyzed using an optical encoder.
A disadvantage of the known solutions is that they consist of a large number of electromechanical components or require complex sensing devices and analysis circuits to analyze the rotational position.
Disclosure of Invention
It is therefore the object of the present invention to provide an electronic rotary switch without a mechanical contact set. Furthermore, the object of the present invention is to provide an electronic rotary switch with as low a mechanical complexity as possible, the mechanical components of which can be produced at as low a cost as possible. Another aspect of the present invention is to provide an electronic rotary switch that may be directly disposed on a circuit board.
The invention is based on the object of providing a continuous heater having such an electronic rotary switch.
This object is achieved by an electronic rotary switch as mentioned at the outset, wherein the rotary switch comprises a circuit board, a potentiometer with a rotatably movable sliding contact arranged on the circuit board in a printed-assembly manner (Printmontage), wherein the sliding contact comprises a receiving element provided for the rotationally fixed reception of an actuating element, wherein the circuit board has a through-opening through which the actuating element and/or the receiving element is guided, and wherein the actuating element is connected rotationally fixed in engagement with the receiving element of the sliding contact, wherein the actuating element comprises at least one latching element on its circumference at the level of the circuit board, and the circuit board has a plurality of latching recesses in the region of the through-opening, which are configured such that, upon rotational actuation of the actuating element, the at least one latching element of the actuating element latches in a latching position in a corresponding latching recess of the circuit board, and the rotary switch comprises a control circuit which is provided for measuring the variable resistance of the potentiometer as a function of the latching positions and for each of the latching positions determining the respective latching position by means of a preset value of the resistance value and providing it as a rotary switch position signal.
The electronic rotary switch according to the invention has a series of advantages. The rotary switch is particularly simple in construction and can therefore be produced quickly and cost-effectively during production. The central electromechanical component of the electronic rotary switch according to the invention is a potentiometer for printed assembly, which is inexpensive on the market and available in a large number of designs. Furthermore, the rotary switch according to the invention is arranged directly on the circuit board, so that it is mechanically held by the circuit board on the one hand and no wiring is required on the other hand.
A suitable embodiment of the invention is characterized in that at least one latching element is designed as a spring element. The detent element, which is designed as a spring element, causes the actuating element to be held in the respective detent position. Only when a correspondingly high torque is applied to the actuating element does the at least one latching element spring back and release the rotational movement of the actuating element again until the next latching position. This is achieved, on the one hand, in that the user can tactually detect the different latching positions when actuating the electronic rotary switch. In addition, the latching position, which is held once, is blocked, i.e. inadvertent adjustment of the actuating element and of the sliding contact of the potentiometer is thereby reliably prevented.
A preferred refinement of the invention is characterized in that the actuating element is formed in one piece. This offers the advantage that the manufacturing effort of the electronic rotary switch is significantly reduced. The at least one latching element, which is designed in particular as a spring element, is an integral component of the actuating element due to the integral design of the actuating element. In this way, the actuating element as a whole can be connected to the sliding contact in a rotationally fixed manner and can be assembled in one piece.
According to a further preferred embodiment of the invention, the actuating element is made of plastic. It is further preferred that the actuating element made of plastic is produced in an injection molding process. Thus, for example, when producing further plastic parts, such as, for example, circuit board covers described further below, the actuating element can be produced in the same injection molding process and coupled to the further components by means of thin material bridges.
A further advantageous embodiment of the invention is characterized in that the electronic rotary switch further comprises a circuit board cover configured for detachable fastening to the circuit board on the actuating element side, wherein the circuit board cover has a recess for guiding through the actuating element. The circuit board cover portion thus fulfils a dual function. In one aspect, the circuit board cover is provided as a cover element for the circuit board. On the other hand, the recess for guiding through the actuating element serves as a bearing element for the actuating element.
According to a further preferred embodiment, the actuating element terminates in the recess at least substantially flush with the circuit board cover for the purpose of being guided through the recess. The actuating element and/or the circuit board cover are therefore arranged such that the actuating element ends in the recess of the lead-through either flush with the circuit board cover or substantially flush with it. This offers the advantage that an adjustment of the actuating element cannot be easily achieved. In this way, it is possible to adjust the electronic rotary switch according to the invention in a simple manner only by qualified operators.
A further advantageous embodiment of the invention is characterized in that the end face of the actuating element has a form-fitting recess which is designed and arranged for the form-fitting, torsionally fixed reception of the actuating element with the actuating section. For adjusting the actuating element, the aforementioned adjusting element is required, which can be connected to the actuating element via a shape recess and can then be manually adjusted via an operating section of the adjusting element. Thus, a rotary actuation of the actuating element is possible only for those with the adjusting element according to the invention. Advantageously, this prevents unauthorized persons from making setting changes on the electronic rotary switch according to the invention. This can basically only be achieved via the actuating section with the actuating element according to the invention.
The object is also achieved by a continuous heater as described above, in that the continuous heater comprises at least one electronic rotary switch having the above-mentioned features.
An advantageous development is characterized in that at least one of the electronic rotary switches of the control electronics is designed and arranged for preselecting the maximum heating capacity of the continuous heater.
Drawings
Further preferred and/or expedient features and embodiments of the invention emerge from the dependent claims and the description. Particularly preferred embodiments are explained in detail with the aid of the drawings. Shown in the attached drawings:
fig. 1 shows a perspective view of a rotary switch according to the present invention, and
fig. 2 shows a perspective view of a rotary switch according to the invention with a circuit board and a circuit board cover.
Detailed Description
Fig. 1 shows a perspective view of a rotary switch according to the invention. A potentiometer 11 is arranged in a printed assembly on a printed circuit board 10, which is embodied, for example, as a printed circuit. As shown in fig. 1, the potentiometer 11 is preferably arranged on the circuit board 10 by means of a through-assembly (durchteckmontage). In this type of assembly, the connection pin 12 of the potentiometer 11 is guided through a contact hole 13 present in the circuit board 10, which is soldered to the soldering side 14 of the circuit board 10. Alternatively, the potentiometer 11 is designed as an SMD component (English: "surface-mounted component") and is arranged directly on the circuit board 10 by means of a connecting surface that can be soldered. This embodiment is not shown in the drawings.
The potentiometer 11 comprises a rotatably movable sliding contact 15, which for the rotationally fixed reception of the actuating element 16 comprises a receiving element 17 provided for this purpose. The receiving element 17 can be embodied, for example, as a slot, but can alternatively be provided with flattened sides in a circular cross-section, as shown in fig. 1. The actuating element 16 comprises, for example, a pin element 18, which is arranged in such a way that it is provided in the receiving element 17 in a form-fitting manner for forming the above-mentioned torsion-proof connection between the actuating element 16 and the sliding contact 15.
The printed circuit board 10 has a through-opening 19 through which the actuating element 16 is guided. Alternatively, according to an embodiment not shown in fig. 1, the receiving element 17 is configured in the manner of a pin and is guided through the through-recess 19 instead of the actuating element 16. Accordingly, the actuating element 16 does not have a pin element 18, but rather a recess, which is likewise not shown in the figures, so that the actuating element 16 can be arranged on the receiving element 17 in a rotationally fixed manner by plugging.
Both embodiments described above allow the actuating element 16 to be connected in a rotationally fixed manner when it is engaged with the receiving element 17 of the sliding contact 15. The circuit board 10 has a plurality of latching recesses 21 in the region of the through-recess 19. Fig. 1 shows, for example, four of the latching recesses 21, the number of the latching recesses 21 being variable and being dependent on how many rotary switch stages the electronic rotary switch according to the invention is intended to have.
The electronic rotary switch according to the invention further comprises a control circuit, not shown in the figures, which is arranged to measure the variable resistance of the potentiometer 11. The control circuit is further provided for determining a respective set detent position for each of the detent positions by means of a preset value for the resistance value and for providing this as a rotary switch position signal. For this purpose, the potentiometer 11 is connected to the control circuit, for example, in such a way that it provides a voltage value as a voltage divider, via its sliding contact of the sliding contact 15, which is proportional to the respective rotational position of the sliding contact 15.
Preferably, the voltage value associated with the latching positions is digitized by means of an analog/digital converter and is evaluated by means of a microprocessor for each of the latching positions using a resistance value preset. The microprocessor then generates a rotary switch position signal in the form of a digital value which gives information about the corresponding rotary switch position.
It is also possible for the control circuit to be designed without a microprocessor, for example by using a window comparator, by means of which the variable resistance of the potentiometer 11, which is dependent on the detent position, is evaluated and converted into a rotary switch position signal. For this purpose, a corresponding logic circuit is arranged downstream of the output of the window comparator, which logic circuit generates a corresponding rotary switch position signal from the output signal of the window comparator.
Preferably, the detent elements 20 are each designed as a spring element. As shown in the figures, the actuating element 16 is further preferably formed in one piece. The spring function of the detent element 20 is achieved by a circumferential recess 22, which is arranged in an outer circumferential surface 23 of the actuating element 16. It is further preferred that the actuating element 16 is made of plastic.
Fig. 2 shows a perspective view of a rotary switch according to the invention with a circuit board 10 and a circuit board cover 24. The circuit board cover 24 is provided to be detachably fixed to the circuit board 10 on the operating element side. For this purpose, the circuit board cover 24 preferably comprises a resiliently embodied retaining element 25, by means of which the circuit board cover 24 is latched to the circuit board 10. The circuit board cover 24 also has a recess 26 which is provided for guiding the actuating element 16 through the recess 26. In other words, the actuating element 16 is guided through the recess 26 of the circuit board cover 24.
Preferably, the actuating element 16 terminates flush or substantially flush with the circuit board cover 24 in the recess 26 for the purpose of being guided through the recess. In this way, the actuating element 16, although accessible from the outside, cannot be adjusted manually without further auxiliary means. This provides the advantage that the electronic rotary switch is protected at least to some extent against unintentional manipulation.
However, in order to be able to actuate the electronic rotary switch, the end face 27 of the actuating element 16 has a shaped recess 28. The form-fit recess 28 is designed and provided for the form-locking reception of the adjusting element 29 in a rotationally fixed manner. The adjusting element 29 preferably has an actuating section 30 which is dimensioned such that the actuating element 16 can be adjusted manually via said actuating section. The actuating element 29 furthermore has a coupling part 31 which is provided for positive insertion into the form-fitting recess 28 in order to establish the mentioned rotationally fixed connection between the actuating element 29 and the actuating element 16. After the rotational position of the actuating element 16 has been adjusted by means of the adjusting element 29, said adjusting element can be pulled down axially and in this way can be removed particularly simply.
The invention also comprises a continuous heater as described at the beginning, which has at least one control electronics. Furthermore, the continuous heater comprises a channel assembly with at least one electrically heatable heating channel, and the control electronics comprise at least one electronic rotary switch with the aforementioned features. In particular, at least one of the electronic rotary switches of the control electronics of the continuous heater is constructed and arranged for preselecting a maximum heating power of the continuous heater.
Claims (9)
1. An electronic rotary switch comprising
A circuit board (10) having a plurality of conductive layers,
a potentiometer (11) arranged on the circuit board (10) in a printed assembly and having a rotatably movable sliding contact (15), wherein the sliding contact (15) comprises a receiving element (17) provided for the rotationally fixed reception of an actuating element (16), wherein the circuit board (10) has a through-opening (19) through which the actuating element (16) and/or the receiving element (17) is guided, and wherein the actuating element (16) is connected rotationally fixed in engagement with the receiving element (17) of the sliding contact (15), wherein the actuating element (16) comprises at least one latching element (20) on its circumference at the level of the circuit board (10), and the circuit board (10) has a plurality of latching recesses (21) in the region of the through-opening (19), the latching recesses are designed in such a way that, when the actuating element (16) is actuated in rotation, at least one latching element (20) of the actuating element (16) latches in a latching position in at least one of the latching recesses (21) of the circuit board (10), and
a control circuit, which is provided to measure a variable resistance of the potentiometer (11) as a function of the detent positions and to determine a respective detent position for each of the detent positions by means of a preset value for the resistance value and to provide the same as a rotary switch position signal.
2. Electronic rotary switch according to claim 1, characterized in that the at least one latching element (20) is in each case constructed as a spring element.
3. Electronic rotary switch according to claim 1 or 2, characterized in that the operating element (16) is integrally formed.
4. Electronic rotary switch according to one of claims 1 to 3, characterized in that the operating element (16) is made of plastic.
5. The electronic rotary switch according to one of claims 1 to 4, further comprising a circuit board cover (24) which is designed for detachable fixing on the circuit board (10) on the operating element side, wherein the circuit board cover (24) has a recess (26) for guiding through the operating element (16).
6. Electronic rotary switch according to claim 5, characterized in that the actuating element (16) ends in the recess (26) at least substantially flush with the circuit board cover (24) for guidance through the recess.
7. The electronic rotary switch according to one of claims 1 to 6, characterized in that the end face (27) of the actuating element (16) has a form-fitting recess (28) which is constructed and arranged for the form-fitting accommodation of an actuating element (29) having an actuating section (30) in a rotationally fixed manner.
8. Electric continuous heater comprising at least one control electronics, a channel assembly with at least one heating channel capable of being electrically heated, wherein the control electronics comprise at least one electronic rotary switch according to any one of claims 1 to 7.
9. The electrical continuous heater of claim 8, wherein at least one of the electronic rotary switches of the control electronics is constructed and arranged to pre-select a maximum heating power of the continuous heater.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19160032.9A EP3703085A1 (en) | 2019-02-28 | 2019-02-28 | Electronic rotary switch and electric continuous-flow heater |
| EP19160032.9 | 2019-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111627629A true CN111627629A (en) | 2020-09-04 |
| CN111627629B CN111627629B (en) | 2023-02-10 |
Family
ID=65635580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010129131.5A Active CN111627629B (en) | 2019-02-28 | 2020-02-28 | Electronic rotary switch and electric continuous heater |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3703085A1 (en) |
| CN (1) | CN111627629B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3042874A1 (en) * | 1980-11-13 | 1982-06-09 | Siemens AG, 1000 Berlin und 8000 München | Adjuster for electrical components mounted on circuit board - has dust-excluding shaft mounting in housing wall |
| EP0071208A2 (en) * | 1981-07-31 | 1983-02-09 | BROWN, BOVERI & CIE Aktiengesellschaft | Rotary potentiometer |
| US5546067A (en) * | 1994-12-14 | 1996-08-13 | United Technologies Automotive, Inc. | Rotary potentiometer assembly for a push-pull switch |
| US5711680A (en) * | 1996-03-19 | 1998-01-27 | Hokuriku Electric Industry Co., Ltd. | Socket type electric device unit |
| JP2882113B2 (en) * | 1991-09-09 | 1999-04-12 | 富士電機株式会社 | Method of mounting electronic components with rotating movable parts to electronic equipment |
| JP2004153223A (en) * | 2002-09-03 | 2004-05-27 | Tokyo Cosmos Electric Co Ltd | Rotary electric component with connector |
| DE202008010525U1 (en) * | 2008-08-07 | 2008-10-16 | Gira Giersiepen Gmbh & Co. Kg | Electrical installation device, such as rotary switch or knob, in particular Rastpotentiometer |
| DE202008002959U1 (en) * | 2008-03-01 | 2009-07-02 | Gira Giersiepen Gmbh & Co. Kg | Electrical installation device, such as rotary switch or knob, in particular Rastpotentiometer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004020827A1 (en) | 2004-04-28 | 2005-11-24 | Preh Gmbh | turntable |
| US7414205B1 (en) | 2007-06-18 | 2008-08-19 | Visteon Global Technologies, Inc. | Low-cost electronic rotary switch |
-
2019
- 2019-02-28 EP EP19160032.9A patent/EP3703085A1/en active Pending
-
2020
- 2020-02-28 CN CN202010129131.5A patent/CN111627629B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3042874A1 (en) * | 1980-11-13 | 1982-06-09 | Siemens AG, 1000 Berlin und 8000 München | Adjuster for electrical components mounted on circuit board - has dust-excluding shaft mounting in housing wall |
| EP0071208A2 (en) * | 1981-07-31 | 1983-02-09 | BROWN, BOVERI & CIE Aktiengesellschaft | Rotary potentiometer |
| JP2882113B2 (en) * | 1991-09-09 | 1999-04-12 | 富士電機株式会社 | Method of mounting electronic components with rotating movable parts to electronic equipment |
| US5546067A (en) * | 1994-12-14 | 1996-08-13 | United Technologies Automotive, Inc. | Rotary potentiometer assembly for a push-pull switch |
| US5711680A (en) * | 1996-03-19 | 1998-01-27 | Hokuriku Electric Industry Co., Ltd. | Socket type electric device unit |
| JP2004153223A (en) * | 2002-09-03 | 2004-05-27 | Tokyo Cosmos Electric Co Ltd | Rotary electric component with connector |
| DE202008002959U1 (en) * | 2008-03-01 | 2009-07-02 | Gira Giersiepen Gmbh & Co. Kg | Electrical installation device, such as rotary switch or knob, in particular Rastpotentiometer |
| ATE498897T1 (en) * | 2008-03-01 | 2011-03-15 | Giersiepen Gira Gmbh | ELECTRICAL INSTALLATION DEVICE, SUCH AS ROTARY SWITCHES OR ROTARY CONTROLS, IN PARTICULAR RATCH POTENTIOMETERS |
| DE202008010525U1 (en) * | 2008-08-07 | 2008-10-16 | Gira Giersiepen Gmbh & Co. Kg | Electrical installation device, such as rotary switch or knob, in particular Rastpotentiometer |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3703085A1 (en) | 2020-09-02 |
| CN111627629B (en) | 2023-02-10 |
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