CN114895809A - Improve anti-jamming capability's spaced touch circuit, touch button and touch product - Google Patents
Improve anti-jamming capability's spaced touch circuit, touch button and touch product Download PDFInfo
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- CN114895809A CN114895809A CN202210822914.0A CN202210822914A CN114895809A CN 114895809 A CN114895809 A CN 114895809A CN 202210822914 A CN202210822914 A CN 202210822914A CN 114895809 A CN114895809 A CN 114895809A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses an air-insulated touch circuit capable of improving anti-jamming capability, a touch key and a touch product, relates to the technical field of touch keys, and solves the technical problem that when the touch key is subjected to air-insulated touch, touch operation of fingers cannot be accurately identified due to the existence of various interference sources. The space-isolated touch circuit comprises a charge transfer scanning module, a filter and a control module which are connected in sequence; the charge transfer scanning module converts a capacitance signal generated by a touch key into a voltage signal, and the filter filters an interference signal in the voltage signal to obtain a touch signal; and the control module identifies and processes the touch signal. The invention improves the capability of the touch key to resist various interferences, realizes the reliable air-separating touch function, and improves the anti-interference capability, the touch key performance and the user experience.
Description
Technical Field
The invention relates to the technical field of touch keys, in particular to an air-insulated touch circuit capable of improving the anti-interference capacity, a touch key and a touch product.
Background
At present, terminals such as whole-house smart homes and smart home appliances are increasingly popularized, and generally each smart terminal device is provided with a plurality of touch keys. At present, the circuit structure implemented by the touch key function of the household appliances is basically that the parasitic capacitance change of the key to the ground is utilized, a slope voltage is generated through charging and discharging of a fixed current, and is compared with a fixed threshold voltage to generate a square wave signal with a corresponding frequency, so that the conversion from capacitance to frequency is realized, and the relationship can be expressed as f = I/(2 x C (Vh-Vl)), wherein C represents a capacitance value, Vh represents a high threshold voltage, Vl represents a low threshold voltage, I represents a charging current, and f represents a frequency. When a human finger touches the key, the parasitic capacitance to the ground changes, the frequency also changes, and the purpose of detecting the finger is achieved by identifying the frequency. The detection circuit principle of the capacitive touch key is shown in the attached figure 1.
When the touch key at the terminal equipment end is detected, various interference sources exist, such as power supply interference, power grid disturbance, space radiation interference, light interference and the like, and the interference sources can change the charge variation of the touch key, so that the detection frequency is changed. In the presence of these interference sources, if a human finger touches a key at intervals, since the air dielectric constant is the smallest and the distance d between the plates forming the capacitance is larger, as can be seen from the capacitance formula C = (ξ × S)/d (ξ is the dielectric constant of the medium between the plates, S is the plate area, and d is the distance between the plates), the amount of capacitance change caused by the interval touch is very small, and the resulting frequency change is also very small, so that it is impossible to distinguish whether the finger touches effectively or changes caused by different interference sources.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
when the touch key is touched in the air, due to the existence of various interference sources, the touch operation of fingers cannot be accurately identified, and the performance of the touch key and the use experience of a user are influenced.
Disclosure of Invention
The invention aims to provide an air touch circuit, a touch key and a touch product for improving the anti-interference capability, and aims to solve the technical problems that when the air touch is carried out on the touch key in the prior art, the touch operation of a finger cannot be accurately identified due to the existence of various interference sources, and the performance of the touch key and the use experience of a user are influenced. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an air-insulated touch circuit capable of improving the anti-interference capability, which comprises a charge transfer scanning module, a filter and a control module which are connected in sequence; the charge transfer scanning module converts a capacitance signal generated by a touch key into a voltage signal, and the filter filters an interference signal in the voltage signal to obtain a touch signal; and the control module identifies and processes the touch signal.
Preferably, the filter includes an analog filter and a digital demodulation filter, the analog filter filters the high-frequency interference signal, and the digital demodulation filter filters the adjacent frequency domain interference signal.
Preferably, an analog-to-digital converter is further connected between the analog filter and the digital demodulation filter, and the analog-to-digital converter converts the analog voltage signal after the analog filter filters the interference signal into a digital voltage signal.
Preferably, the analog filter filters at least one of the spatial radiation interference signal and the radio frequency interference signal.
Preferably, the analog filter is an active filter or a passive filter.
Preferably, the active filter is a second-order active filter.
Preferably, the digital demodulation filter filters at least one of a power supply interference signal, a power grid interference signal and a light interference signal.
A touch key comprises the space touch circuit capable of improving the anti-interference capability.
A touch product comprises the touch key.
Preferably, the touch product is an intelligent household appliance device, an intelligent household device or an industrial control device.
The implementation of one of the technical schemes of the invention has the following advantages or beneficial effects:
according to the invention, when the touch key is subjected to the air-insulated touch, the capacitance signal generated by the touch is converted into the voltage signal, so that the interference signal can be filtered more easily through the filter, the touch operation of the finger can be accurately identified through the control module, the anti-interference capability, the touch key performance and the user experience are improved, and the performance of the air-insulated touch control product is also improved. Through the circuit structure processing of the invention, the capability of the touch key to resist various interferences is greatly improved, and further, under the condition of the existence of the interferences, effective weak capacitance change can be still identified, and the reliable air-isolated touch function is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of a prior art detection circuit for a capacitive touch key;
fig. 2 is a schematic diagram of an isolated touch circuit with improved interference rejection capability according to an embodiment of the present invention.
Detailed Description
In order that the objects, aspects and advantages of the present invention will become more apparent, various exemplary embodiments will be described below with reference to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary embodiments in which the invention may be practiced. The same numbers in different drawings identify the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatus, etc. consistent with certain aspects of the present disclosure as detailed in the appended claims, and that other embodiments may be used or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the present disclosure.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," and the like are used in the orientations and positional relationships illustrated in the accompanying drawings for the purpose of facilitating the description of the present invention and simplifying the description, and do not indicate or imply that the elements so referred to must have a particular orientation, be constructed in a particular orientation, and be operated. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected" and "coupled" are to be construed broadly and may include, for example, a fixed connection, a removable connection, an integral connection, a mechanical connection, an electrical connection, a communicative connection, a direct connection, an indirect connection via intermediate media, and may include, for example, a connection between two elements or an interaction between two elements. The term "and/or" includes any and all combinations of one or more of the associated listed items. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to explain the technical solution of the present invention, the following description is made by way of specific examples, which only show the relevant portions of the embodiments of the present invention.
The first embodiment is as follows:
as shown in fig. 2, the present invention provides an air-spaced touch circuit with improved interference rejection capability, which includes a charge transfer scan module, a filter, and a control module connected in sequence. The charge transfer scanning module converts a capacitance signal generated by the touch key into a voltage signal, and the charge transfer scanning module can adopt the prior art, such as a capacitance-voltage conversion circuit, a capacitance-voltage converter and the like, and the original capacitance signal is easier to measure, collect, analyze and perform subsequent digital processing through conversion. The filter filters interference signals in the voltage signals to obtain touch signals, enables useful signals to pass smoothly and inhibits (or attenuates) interference frequency signals, and can be set to be one or more according to the characteristics of different interference signals, so that various types of interference signals are effectively removed; the control module identifies and processes the touch signal, so that corresponding touch operation is realized. According to the invention, when the touch key is subjected to the air-insulated touch, the capacitance signal generated by the touch is converted into the voltage signal, so that the interference signal can be filtered more easily through the filter, the touch operation of the finger can be accurately identified through the control module, the anti-interference capability, the touch key performance and the user experience are improved, and the performance of the air-insulated touch control product is also improved. Through the circuit structure processing of the invention, the capability of the touch key to resist various interferences is greatly improved, and further, under the condition of the existence of the interferences, effective weak capacitance change can be still identified, and the reliable air-isolated touch function is realized.
As an optional implementation manner, the filter includes an analog filter and a digital demodulation filter, the analog filter filters the high-frequency interference signal, and the digital demodulation filter filters the adjacent frequency domain interference signal. The analog filter has high filtering speed, simple system and wide adaptive frequency range, and the frequency can cover the whole physical frequency range; the digital demodulation filter adopts repeated sampling for many times, and has relatively small frequency range, generally filtering in low-frequency and intermediate-frequency ranges, which is difficult to improve digital precision and adapt to periodic noise. The touch circuit combines the two analog filters and the digital demodulation filter, and can give consideration to the respective advantages of the two filters, thereby realizing better filtering effect and improving the anti-interference capability of the touch circuit.
As an optional implementation manner, an analog-to-digital converter is further connected between the analog filter and the digital demodulation filter, and the analog-to-digital converter converts the analog voltage signal, from which the interference signal is filtered by the analog filter, into a digital voltage signal, so as to facilitate digital demodulation and filtering operations of the digital demodulation filter. Meanwhile, a comparator is connected between the charge transfer scanning module and the analog filter, and the comparator outputs a voltage signal converted by the charge transfer scanning module into a square wave signal by setting a reference voltage. The control module is also connected with the charge transfer scanning module and is used for controlling the time sequence of the charge transfer scanning module so that the charge transfer scanning module scans according to a fixed time sequence.
As an optional implementation manner, the analog filter filters at least one of the spatial radiation interference signal and the radio frequency interference signal, where the spatial radiation interference signal and the radio frequency interference signal are high-frequency signals, and the analog filter is convenient to effectively filter out an out-of-band interference signal superimposed on the voltage signal. The analog filter is an active filter or a passive filter, and can be selected according to the actual interference signal condition. The active filter is a second-order active filter, so that a better interference signal filtering effect can be obtained, and of course, filters of other orders can be selected to achieve a better filtering effect.
As an optional implementation manner, the digital demodulation filter filters at least one of the power supply interference signal, the power grid interference signal, and the light interference signal, and the power supply interference signal, the power grid interference signal, and the light interference signal are medium and low frequency signals, so that the digital demodulation filter can conveniently filter the medium and low frequency signals. Certainly, the order and the bandwidth of the corresponding digital demodulation filter can be designed according to different interference signal characteristics so as to improve the anti-interference capability of the touch circuit.
The embodiment is only a specific example and does not indicate such an implementation of the invention.
Example two:
a touch key comprises an isolated touch circuit which improves the anti-interference capability in the first embodiment. Through the air-isolation touch circuit, the capability of the touch key to resist various interferences is greatly improved, and further, effective weak capacitance change can be still identified under the condition that the interferences exist, so that a reliable air-isolation touch function is realized.
Example three:
a touch product comprises the touch key of the second embodiment. The touch product has strong anti-interference capability, realizes a reliable air-separating touch function, and effectively improves the product performance and the user experience.
As an optional implementation manner, the touch product is an intelligent household appliance device, an intelligent household device, or an industrial control device. The intelligent household appliances are induction cookers, microwave ovens, soybean milk machines, wall breaking machines, coffee machines, tea bar machines, smoke exhaust ventilators, water dispensers and the like, the intelligent household appliances are intelligent door locks, intelligent bathrooms, intelligent lamp controls and the like, and the industrial control appliances are industrial control panels, new energy automobiles, intelligent panels and the like.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. An air-insulated touch circuit for improving the anti-interference capability is characterized by comprising a charge transfer scanning module, a filter and a control module which are connected in sequence; the charge transfer scanning module converts a capacitance signal generated by a touch key into a voltage signal, and the filter filters an interference signal in the voltage signal to obtain a touch signal; and the control module identifies and processes the touch signal.
2. An improved immunity to interference as recited in claim 1, wherein said filter comprises an analog filter and a digital demodulation filter, said analog filter filtering out high frequency interference signals and said digital demodulation filter filtering out adjacent frequency domain interference signals.
3. The isolated touch circuit capable of improving interference rejection of claim 2, wherein an analog-to-digital converter is further connected between the analog filter and the digital demodulation filter, and the analog-to-digital converter converts an analog voltage signal obtained by filtering the interference signal by the analog filter into a digital voltage signal.
4. The isolated touch circuit with improved immunity to interference of claim 2, wherein the analog filter filters out at least one of spatial radiation interference signals and radio frequency interference signals.
5. The isolated touch circuit with increased immunity to interference of claim 4, wherein the analog filter is an active filter or a passive filter.
6. The isolated touch circuit with increased immunity to interference of claim 5, wherein the active filter is a second order active filter.
7. The improved immunity to interference as recited in claim 2, wherein said digital demodulation filter filters out at least one of power supply interference signals, grid interference signals, and light interference signals.
8. A touch key comprising the isolated touch circuit of any of claims 1-7 with improved tamper resistance.
9. A touch product, characterized in that it comprises a touch key according to claim 8.
10. The touch product of claim 9, wherein the touch product is an intelligent home appliance device, an intelligent home device, or an industrial control device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210822914.0A CN114895809A (en) | 2022-07-14 | 2022-07-14 | Improve anti-jamming capability's spaced touch circuit, touch button and touch product |
| CN202223539098.7U CN219087117U (en) | 2022-07-14 | 2022-12-29 | Spaced touch circuit, touch key and touch product capable of improving anti-interference capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210822914.0A CN114895809A (en) | 2022-07-14 | 2022-07-14 | Improve anti-jamming capability's spaced touch circuit, touch button and touch product |
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| Publication Number | Publication Date |
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| CN114895809A true CN114895809A (en) | 2022-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210822914.0A Pending CN114895809A (en) | 2022-07-14 | 2022-07-14 | Improve anti-jamming capability's spaced touch circuit, touch button and touch product |
| CN202223539098.7U Active CN219087117U (en) | 2022-07-14 | 2022-12-29 | Spaced touch circuit, touch key and touch product capable of improving anti-interference capability |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223539098.7U Active CN219087117U (en) | 2022-07-14 | 2022-12-29 | Spaced touch circuit, touch key and touch product capable of improving anti-interference capability |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6288707B1 (en) * | 1996-07-29 | 2001-09-11 | Harald Philipp | Capacitive position sensor |
| CN101213461A (en) * | 2005-06-03 | 2008-07-02 | 辛纳普蒂克斯公司 | Methods and systems for detecting a capacitance using SIGMA-DELTA measurement techniques |
| CN102594327A (en) * | 2011-01-14 | 2012-07-18 | 苏州路之遥科技股份有限公司 | Capacitive sensing key and key detection method |
| CN107508586A (en) * | 2017-08-08 | 2017-12-22 | 深圳市锦锐科技有限公司 | A kind of super low-power consumption touch key-press circuit and its application method |
| CN114337634A (en) * | 2021-12-30 | 2022-04-12 | 深圳市朗科智能电气股份有限公司 | Capacitive touch key detection circuit and detection method thereof |
-
2022
- 2022-07-14 CN CN202210822914.0A patent/CN114895809A/en active Pending
- 2022-12-29 CN CN202223539098.7U patent/CN219087117U/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6288707B1 (en) * | 1996-07-29 | 2001-09-11 | Harald Philipp | Capacitive position sensor |
| CN101213461A (en) * | 2005-06-03 | 2008-07-02 | 辛纳普蒂克斯公司 | Methods and systems for detecting a capacitance using SIGMA-DELTA measurement techniques |
| CN102594327A (en) * | 2011-01-14 | 2012-07-18 | 苏州路之遥科技股份有限公司 | Capacitive sensing key and key detection method |
| CN107508586A (en) * | 2017-08-08 | 2017-12-22 | 深圳市锦锐科技有限公司 | A kind of super low-power consumption touch key-press circuit and its application method |
| CN114337634A (en) * | 2021-12-30 | 2022-04-12 | 深圳市朗科智能电气股份有限公司 | Capacitive touch key detection circuit and detection method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 周素华等: "《数字信号处理基础》", 28 February 2017, 北京理工大学出版社 * |
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| CN219087117U (en) | 2023-05-26 |
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Application publication date: 20220812 |