CN110736923A - kinds of key detection circuits, touch screen and heating and ventilation equipment - Google Patents
kinds of key detection circuits, touch screen and heating and ventilation equipment Download PDFInfo
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- CN110736923A CN110736923A CN201911000285.8A CN201911000285A CN110736923A CN 110736923 A CN110736923 A CN 110736923A CN 201911000285 A CN201911000285 A CN 201911000285A CN 110736923 A CN110736923 A CN 110736923A
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 title claims abstract description 10
- 238000009423 ventilation Methods 0.000 title abstract description 8
- 230000009191 jumping Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
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- Electronic Switches (AREA)
Abstract
The invention relates to key detection circuits, a touch screen and heating and ventilation equipment, wherein the key detection circuit comprises a timing circuit, a comparison circuit and a controller, wherein the timing circuit is connected with a monitored touch screen and used for calculating the touch duration of the touch screen and outputting a level signal when the touch duration meets the preset duration, the comparison circuit is used for outputting a jump signal when the timing circuit outputs a level signal, and the controller is used for judging whether the monitored touch screen is touched according to the jump signal.
Description
Technical Field
The invention relates to the technical field of key detection, in particular to key detection circuits, a touch screen and heating and ventilation equipment.
Background
A pulse signal key commonly used in electronic devices includes: three-point type key, two-point type key and touch type key. The current common anti-shake measures are divided into software and hardware; the anti-shake effect of software is perfect, and an independent anti-shake method is basically adopted in the aspect of hardware.
At present, various keys are widely used for the heating and ventilation equipment , because large units, particularly compressors, fans and other inductive loads of the large variable frequency units are started, radiation interference of to the space is generated, the large units are coupled to the line or a touch screen, and the large units have relatively large interference to the touch screen, so that the touch detection requirement on the touch screen is higher.
Disclosure of Invention
In view of this, the present invention provides types of key detection circuits, touch panels, and heating and ventilation devices, so as to solve the problems of single method , complex structure, and high deployment implementation cost in the prior art that improves the reliability of key detection by a hardware detection method.
According to of the embodiments of the present invention, there is provided kinds of key detecting circuits, including:
the timing circuit is connected with the monitored touch screen and used for calculating the touch duration of the touch screen and outputting an th level signal when the touch duration meets the preset duration;
the comparison circuit is used for outputting a jump signal when the th level signal is output by the timing circuit;
and the controller is used for judging whether the monitored touch screen is touched according to the jumping signal.
Preferably, the comparison circuit is also connected to the monitored touch screen and is turned on when the touch screen is touched.
Preferably, the th level signal is a high level signal;
the comparison circuit is specifically configured to start working when the monitored touch screen is touched, and output a jump signal when the timing circuit outputs a high level signal.
Preferably, the timing circuit includes:
the logic timer is a timer for the logic to be run,
an th comparator, the positive phase input end of which is externally connected with reference voltage, the negative phase input end of which is connected with the monitored touch screen through a filter circuit, and the output end of which is connected with the logic timer;
the th comparator is used for outputting a trigger signal when the touch voltage output by the touch screen is greater than the reference voltage so as to trigger the logic timer to start timing, and outputting a th level signal when the timing reaches a preset time length.
Preferably, the input end of the logic timer is connected with the output end of the th comparator, the timing end is connected with the crystal oscillator, and the output end is connected with the comparison circuit.
Preferably, the filter circuit includes:
an th resistor connected between the touch screen and the negative phase input terminal of the th comparator;
the second resistor, terminal , is connected to the negative input terminal of the th comparator, and terminal is grounded;
the capacitor, end is connected to the touch screen, and end is grounded.
Preferably, the comparison circuit includes:
and the inverting input end of the second comparator is connected with the output end of the timing circuit through a third resistor, the non-inverting input end of the second comparator is grounded through a fourth resistor, and the gating end of the second comparator is connected with the touch screen through an amplifying circuit.
Preferably, the amplifying circuit includes:
a base electrode of the triode is connected with the touch screen, a collector electrode of the triode is connected with the output end of the second comparator through a fifth resistor and a sixth resistor which are connected in series, and an emitting electrode of the triode is grounded;
and the collector of the triode is also connected with the gating end of the second comparator and is connected with the power supply end of the second comparator through an adjustable resistor.
According to a second aspect of the embodiments of the present invention, there are provided kinds of touch screens, including:
the key detection circuit is provided.
According to a third aspect of embodiments of the present invention, there is provided kinds of heating and ventilating apparatuses, including:
the touch screen is provided.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the touch control time length of the monitored touch control screen is calculated through the timing circuit, level signals are output when the touch control time length meets the preset time length, the comparison circuit outputs jumping signals when the timing circuit outputs level signals, and the controller judges whether the monitored touch control screen is touched or not according to the jumping signals, so that the reliability of key detection is improved through a hardware detection mode, and misoperation detection of touch keys caused by unit interference is prevented.
It is to be understood that both the foregoing -general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification , illustrate embodiments consistent with the invention and together with the description , serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a key detect circuit shown in accordance with an exemplary embodiment of .
Detailed Description
The embodiments described in the exemplary embodiments below do not represent all embodiments consistent with the invention's , rather, they are merely examples consistent with the invention's aspects , as detailed in the appended claims.
FIG. 1 is a schematic diagram of a key detect circuit according to an exemplary embodiment of , the circuit including, as shown in FIG. 1:
the timing circuit 1 is connected with the monitored touch screen and used for calculating the touch duration of the touch screen and outputting an th level signal when the touch duration meets the preset duration;
a comparator circuit 2 for outputting a transition signal when the timing circuit 1 outputs an th level signal;
and a controller (not shown in the drawings) for judging whether the monitored touch screen is touched according to the jump signal.
It should be noted that the technical solution provided in this embodiment is applicable to a touch screen, and especially applicable to a heating and ventilation device with a touch screen.
It should be noted that the controller includes but is not limited to: microprocessor, singlechip, PLC controller, DSP controller, FPGA controller etc..
The controller is used for judging whether the monitored touch screen is touched according to the jump signal, and specifically comprises the following steps: when the jumping signal time output by the comparison circuit meets the sampling time of the controller, the monitored touch screen is judged to be touched, otherwise, the misoperation is judged.
It can be understood that, in the technical scheme provided in this embodiment, the timing circuit is used to calculate the touch duration of the monitored touch screen, and when the touch duration satisfies the preset duration, an -th level signal is output, the comparison circuit outputs a jump signal when the timing circuit outputs a -th level signal, and the controller determines whether the monitored touch screen is touched according to the jump signal, so as to implement a hardware detection mode, improve the reliability of key detection, and prevent the detection of a touch key misoperation caused by machine set interference.
Preferably, the comparison circuit 2 is also connected to the monitored touch screen and is turned on when the touch screen is touched.
It can be understood that the comparison circuit is also connected with the monitored touch screen and is started when the touch screen is touched, so that the comparison circuit can be prevented from being triggered by mistake, electric energy can be saved, the comparison circuit is prevented from being in a starting state directly, and the service life of components is prolonged.
Preferably, the th level signal is a high level signal;
the comparison circuit 2 is specifically configured to start working when the monitored touch screen is touched, and output a jump signal when the timing circuit 1 outputs a high level signal.
Preferably, the timing circuit 1 includes:
the logic timer is a timer for the logic to be run,
an th comparator U2, the positive phase input end of which is externally connected with reference voltage, the negative phase input end of which is connected with the touch screen to be monitored through a filter circuit, and the output end of which is connected with the logic timer;
the th comparator U2 is configured to output a trigger signal when the touch voltage output by the touch screen is greater than the reference voltage, so as to trigger the logic timer to start timing, and output a th level signal when the timing reaches a preset time length.
Preferably, the input end of the logic timer is connected to the output end of the th comparator U2, the timing end is connected to the crystal oscillator, and the output end is connected to the comparison circuit 2.
It should be noted that the value of the reference voltage is set according to historical empirical values or experimental data, for example, to 1.137V. The preset time length is set according to historical experience values or experimental data, for example, t1 and t1 > 0 are set.
For example, if the disturbances are smaller than the reference voltage 1.137V, the th comparator does not output a trigger signal, the logic timer does not start working, which is equivalent to automatically clearing the disturbances, and if the disturbances are larger than 1.137V but the time does not satisfy the set t1, the logic timer does not output, which is equivalent to automatically clearing the disturbances.
Preferably, the filter circuit includes:
an th resistor R3 connected between the touch screen and the negative phase input terminal of the th comparator U2;
ends of the second resistors R4 and R are connected with the negative phase input end of the th comparator U2, and the other end is grounded;
the ends of the capacitors C1 and are connected with the touch screen, and the other end is grounded.
It can be understood that the filter circuit is arranged to filter out noise in the th comparator input voltage, reduce interference, and ensure the accuracy of the judgment result.
It can be understood that, the technical scheme provided by the embodiment has the advantages of simple circuit structure, easy deployment and implementation, increased user selection, good user experience degree and high satisfaction degree.
Preferably, the comparison circuit 2 includes:
and an inverting input end of the second comparator U1 is connected with the output end of the timing circuit through a third resistor R1, a non-inverting input end of the second comparator U1 is grounded through a fourth resistor R2, and a gating end of the second comparator U1 is connected with the touch screen through a amplifying circuit.
Preferably, the amplifying circuit includes:
a base electrode of the triode Q1 is connected with the touch screen, a collector electrode of the triode Q1 is connected with the output end of the second comparator U1 through a fifth resistor R5 and a sixth resistor R6 which are connected in series, and an emitting electrode of the triode Q1 is grounded;
the collector of the triode Q1 is also connected with the gating end of the second comparator U1 and passes through an adjustable resistor RPIs connected to the power supply terminal of the second comparator U1.
Preferably, the model of the second comparator U1 is LM 111.
When the input of the gating end pin 6 of the second comparator U1 is in a high level, the output of the second comparator U1 is in a high level, and the second comparator U1 is in an inhibiting state regardless of the input state; when the input of the gating end pin 6 of the second comparator U1 is low level, the transistor Q1 is cut off, and the second comparator U1 is gated at the moment, so that the comparison circuit is in a normal working state.
It can be understood that after the touch screen is touched, Q1 is in an on state, U1 is turned on and is in an operating state, at this time, an input signal of a th comparator U2 is greater than a reference voltage 1.137V, then timing is started by a logic timer, when an input signal of a th comparator U2 is greater than a set time t1, the logic timer outputs a high level, then a second comparator U1 outputs a low level (that is, an output of U1 changes from a high level to a low level, and a transition signal is output), when a time of the transition signal output by a second comparator U1 meets a time sampled by a controller, that is, it is determined that the monitored touch screen is touched, otherwise, it is determined that an erroneous operation is performed.
For example, if the disturbances are smaller than the reference voltage 1.137V, the th comparator does not output a trigger signal, the logic timer does not start working, which is equivalent to automatically clearing the disturbances, and if the disturbances are larger than 1.137V but the time does not satisfy the set t1, the logic timer does not output, which is equivalent to automatically clearing the disturbances.
kinds of touch screens are provided according to an exemplary embodiment of the present invention, including:
the key detection circuit is provided.
It can be understood that, in the technical scheme provided in this embodiment, the timing circuit is used to calculate the touch duration of the monitored touch screen, and when the touch duration satisfies the preset duration, an -th level signal is output, the comparison circuit outputs a jump signal when the timing circuit outputs a -th level signal, and the controller determines whether the monitored touch screen is touched according to the jump signal, so as to implement a hardware detection mode, improve the reliability of key detection, and prevent the detection of a touch key misoperation caused by machine set interference.
types of heating and ventilation equipment are provided according to an exemplary embodiment of the invention, which comprises:
the touch screen is provided.
It can be understood that, in the technical scheme provided in this embodiment, the timing circuit is used to calculate the touch duration of the monitored touch screen, and when the touch duration satisfies the preset duration, an -th level signal is output, the comparison circuit outputs a jump signal when the timing circuit outputs a -th level signal, and the controller determines whether the monitored touch screen is touched according to the jump signal, so as to implement a hardware detection mode, improve the reliability of key detection, and prevent the detection of a touch key misoperation caused by machine set interference.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in the other embodiments may be referred to for the content which is not described in detail in the embodiments.
It should be noted that, in the description of the present invention, the terms "", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include or more executable instructions for implementing specific logical functions or steps in the process, and the scope of the preferred embodiments of the present invention includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
For example, if implemented in hardware, and in another embodiment , it may be implemented using any item or combination thereof known in the art, a discrete logic circuit having logic circuits for implementing logic functions on data signals, an application specific integrated circuit having appropriate combinational logic circuits, a programmable array (PGA), a field programmable array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware associated with instructions of a program, which may be stored in computer readable storage media, and when executed, the program includes or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present invention may be integrated into processing modules, or each unit may exist alone physically, or two or more units are integrated into modules.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the terms " embodiments," " embodiments," "examples," "specific examples," or " examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least embodiments or examples of the invention.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1, kinds of button detection circuit, characterized by, including:
the timing circuit is connected with the monitored touch screen and used for calculating the touch duration of the touch screen and outputting an th level signal when the touch duration meets the preset duration;
the comparison circuit is used for outputting a jump signal when the th level signal is output by the timing circuit;
and the controller is used for judging whether the monitored touch screen is touched according to the jumping signal.
2. The circuit of claim 1,
the comparison circuit is also connected with the monitored touch screen and is started when the touch screen is touched.
3. The circuit of claim 2,
the th level signal is a high level signal;
the comparison circuit is specifically configured to start working when the monitored touch screen is touched, and output a jump signal when the timing circuit outputs a high level signal.
4. The circuit of claim 1, wherein the timing circuit comprises:
the logic timer is a timer for the logic to be run,
an th comparator, the positive phase input end of which is externally connected with reference voltage, the negative phase input end of which is connected with the monitored touch screen through a filter circuit, and the output end of which is connected with the logic timer;
the th comparator is used for outputting a trigger signal when the touch voltage output by the touch screen is greater than the reference voltage so as to trigger the logic timer to start timing, and outputting a th level signal when the timing reaches a preset time length.
5. The circuit of claim 4,
and the input end of the logic timer is connected with the output end of the th comparator, the timing end of the logic timer is connected with the crystal oscillator, and the output end of the logic timer is connected with the comparison circuit.
6. The circuit of claim 4, wherein the filtering circuit comprises:
an th resistor connected between the touch screen and the negative phase input terminal of the th comparator;
the second resistor, terminal , is connected to the negative input terminal of the th comparator, and terminal is grounded;
the capacitor, end is connected to the touch screen, and end is grounded.
7. The circuit of claim 2, wherein the comparison circuit comprises:
and the inverting input end of the second comparator is connected with the output end of the timing circuit through a third resistor, the non-inverting input end of the second comparator is grounded through a fourth resistor, and the gating end of the second comparator is connected with the touch screen through an amplifying circuit.
8. The circuit of claim 7, wherein the amplification circuit comprises:
a base electrode of the triode is connected with the touch screen, a collector electrode of the triode is connected with the output end of the second comparator through a fifth resistor and a sixth resistor which are connected in series, and an emitting electrode of the triode is grounded;
and the collector of the triode is also connected with the gating end of the second comparator and is connected with the power supply end of the second comparator through an adjustable resistor.
9, kinds of touch screen, its characterized in that includes:
the key detect circuit of any one of claims 1-8 through .
10, heating and ventilating device, characterized by comprising:
the touch screen of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911000285.8A CN110736923A (en) | 2019-10-21 | 2019-10-21 | kinds of key detection circuits, touch screen and heating and ventilation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911000285.8A CN110736923A (en) | 2019-10-21 | 2019-10-21 | kinds of key detection circuits, touch screen and heating and ventilation equipment |
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| CN110736923A true CN110736923A (en) | 2020-01-31 |
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| CN201911000285.8A Pending CN110736923A (en) | 2019-10-21 | 2019-10-21 | kinds of key detection circuits, touch screen and heating and ventilation equipment |
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| CN201063115Y (en) * | 2007-07-23 | 2008-05-21 | 海尔集团公司 | Touch type switch of computer cabinet |
| CN204155206U (en) * | 2014-09-24 | 2015-02-11 | 深圳市朗驰欣创科技有限公司 | A kind of Macintosh reset circuit |
| CN104716944A (en) * | 2015-03-30 | 2015-06-17 | 广东美的厨房电器制造有限公司 | Trigging judgement method of touch key and household appliance |
| CN106033964A (en) * | 2015-03-16 | 2016-10-19 | 佛山市顺德区美的电热电器制造有限公司 | Button trigger detection apparatus in household appliance and the household appliance possessing the button trigger detection apparatus |
| CN206211970U (en) * | 2016-11-23 | 2017-05-31 | 广州视源电子科技股份有限公司 | A kind of button operation detects circuit |
| CN109656741A (en) * | 2018-12-21 | 2019-04-19 | 郑州云海信息技术有限公司 | A kind of key-press status processing unit and processing method |
| CN211554238U (en) * | 2019-10-21 | 2020-09-22 | 珠海格力电器股份有限公司 | Key detection circuit, touch screen and heating and ventilation equipment |
-
2019
- 2019-10-21 CN CN201911000285.8A patent/CN110736923A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2385475Y (en) * | 1998-03-20 | 2000-06-28 | 陈文彬 | Key switch controller |
| CN201063115Y (en) * | 2007-07-23 | 2008-05-21 | 海尔集团公司 | Touch type switch of computer cabinet |
| CN204155206U (en) * | 2014-09-24 | 2015-02-11 | 深圳市朗驰欣创科技有限公司 | A kind of Macintosh reset circuit |
| CN106033964A (en) * | 2015-03-16 | 2016-10-19 | 佛山市顺德区美的电热电器制造有限公司 | Button trigger detection apparatus in household appliance and the household appliance possessing the button trigger detection apparatus |
| CN104716944A (en) * | 2015-03-30 | 2015-06-17 | 广东美的厨房电器制造有限公司 | Trigging judgement method of touch key and household appliance |
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