CN103905024A - Button circuit for improving sensitivity of capacitance induction button, and compensation circuit and compensation method thereof - Google Patents
Button circuit for improving sensitivity of capacitance induction button, and compensation circuit and compensation method thereof Download PDFInfo
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- CN103905024A CN103905024A CN201210580876.9A CN201210580876A CN103905024A CN 103905024 A CN103905024 A CN 103905024A CN 201210580876 A CN201210580876 A CN 201210580876A CN 103905024 A CN103905024 A CN 103905024A
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Abstract
The invention discloses a button, and especially relates to a capacitance induction button circuit, and a compensation circuit and compensation method thereof, for overcoming the defects of incapability of comprehensively eliminating influences of environmental factors on button sensitivity and incapability of automatic continuous adjustment of the button sensitivity in the prior art. The capacitance induction button circuit provided by the invention comprises at least one button, an induction electrode corresponding to each button, and a controller MCU, and is characterized by further comprising at least one compensation electrode for respectively detecting parasitic capacitance existing between each induction electrode and the ground and a compensation circuit corresponding to each compensation electrode. Each compensation circuit is respectively used for amplifying the detected signals of a corresponding compensation electrode, and the controller MCU compensates capacitance value signals detected by the controller MCU by use of compensation signals output by the compensation circuit so as to obtain induction capacitance value signals generated by a push button.
Description
Technical field
The present invention relates to a kind of button, relate in particular to a kind of cap-sensor circuit, its compensating circuit and compensation method.
Background technology
A lot of electronic equipments are all provided with button, have the button of two kinds of different operating principles in prior art, and a kind of is the button of mechanical structure, although this button low price is pressed rapid wear, failure rate is higher, reprocesses life period and money cost.Another kind is cap-sensor, the general principle of cap-sensor as shown in Figure 1, in the time of human body (finger) contacting metal induction electrode, because human body is equivalent to an electric capacity that connects the earth, therefore can between induction electrode and the earth, form an electric capacity, induced electricity capacity has several pF conventionally to tens pF.Utilize this general principle, build interlock circuit in outside, just can, according to the variation of this capacitance, detect and whether have human body contacting metal induction electrode.Sensitivity is the very important performance parameter of button, although cap-sensor sensitivity is higher compared with mechanical key, useful life is higher, but cap-sensor also exists some shortcomings, as little in capacitance change, easily be subject to the impact that environment temperature, humidity, surface such as stain at the factor, the sensitivity that affects button due to interference signal around being subject in the existing electronic equipment that is much provided with cap-sensor does not reach desirable requirement.In prior art, conventionally under certain environment, select a suitable adjustment of sensitivity capacitance, utilize power on self calibration and software of cap-sensor control chip the mode such as before powering on, to regulate to realize.But a lot of experiments show in the cap-sensor device of adjusting sensitivity capacitance, in the time that character of temperature, humidity, cap-sensor sensitive surface etc. changes, current capacitance just can not provide applicable sensitivity, this just need to readjust the sensitivity capacitance of cap-sensor, at this moment conventionally need to re-power to system, dismantle lower circuit board and change suitable sensitivity electric capacity, to reach suitable sensitivity.
In order to address the above problem, authorized utility model (CN201294510Y) discloses a kind of touch button device, and it comprises sensitivity-adjusted signal unit, MCU, touch key-press control chip, switch-operated response control, electronic switch, regulates indicator light, touch key-press sensitive surface; Sensitivity-adjusted signal unit is connected with MCU, MCU is connected with touch key-press control chip by switch-operated response control, MCU is connected with touch key-press control chip by electronic switch, regulates indicator light to be connected with MCU, and MCU is connected with touch key-press sensitive surface by touch key-press control chip.Wherein the output signal of sensitivity-adjusted signal unit can be the control signal of remote controller or the output signal of humidity sensor.Switch-operated response control is made up of Multipexer selector and electric capacity, Multipexer selector connects the electric capacity of different capabilities, for different environmental conditions, the electric capacity of each different capabilities that Multipexer selector connects is in order to ensure the suitable sensitivity of touch key-press under different environmental conditions.For example Multipexer selector connects the electric capacity of 4 gears, to adapt under varying environment condition, and the demand of touch key-press to suitable sensitivity.MCU, according to sensitivity-adjusted signal, sends the selection instruction of selecting electric capacity gear to Multipexer selector, Multipexer selector, according to the selection instruction of MCU, is connected selected electric capacity.If need more accurate adjustment of sensitivity, set the electric capacity of more multiple gears, the electric capacity difference of each gear is set smallerly.In the time that MCU sends instruction to switch-operated response control, MCU sends instruction to electronic switch simultaneously, electronic switch blocks the power supply of touch key-press control chip, and Multipexer selector is sent to corresponding instruction and select suitable capacitance gear, after to be regulated completing, MCU controls the power supply of electronic switch conducting touch key-press control chip, and touch button device is normally worked.In addition, in the time carrying out touch key-press adjustment of sensitivity, MCU lights adjusting indicator light, and after completing adjustment of sensitivity, MCU extinguishes adjusting indicator light.Although the touch key-press of this utility model can automatically be adjusted on a large scale button sensitivity in the situation that of not power-off of system, avoided the system to carry out power-off and dismantle circuit board changing the inconvenience of sensitivity electric capacity simultaneously, also improve the applicable scope of same circuit board, avoided producing for varying environment the situation of different printed boards.But there are following two deficiencies in the scheme of this utility model: the one, just considered the change of ambient humidity for disturbing factor, and the 2nd, can not regulate automatically and continuously, make the sensitivity of touch sensible button remain at the position of setting.
Summary of the invention
For the above shortcoming existing in prior art, the invention provides a kind of cap-sensor circuit, comprising: at least one button, with the corresponding induction electrode of each button, controller MCU; Characterized by further comprising at least one for detect respectively the compensating electrode of the parasitic capacitance existing between each induction electrode and ground and with the corresponding compensating circuit of each compensating electrode, the signal that each compensating circuit is respectively used to corresponding compensating electrode being detected amplifies, the capacitance signal that controller MCU utilizes the compensating signal of compensating circuit output to detect controller MCU compensates, to obtain the inductance capacitance value signal being produced with pressing keys.
The present invention also provides the compensating circuit for the signal of the compensating electrode detecting is amplified, and this compensating circuit comprises: compensating electrode, operational amplifier, resistance R 1, resistance R 2; Wherein operational amplifier input is connected with the output of compensating electrode, another input is connected between resistance R 1 and the tie point of resistance R 2, the other end ground connection of resistance R 1, the other end of resistance R 2 is connected with the output of operational amplifier, and the output of operational amplifier is connected to the I/O port of controller MCU.
The present invention also provides a kind of compensation method of cap-sensor sensitivity, the method comprises the steps: correspondingly with each button in key circuit a compensating electrode to be set for detection of the parasitic capacitance existing between the induction electrode of each button and ground, the signal of the compensating electrode detecting is amplified and send to controller MCU by the I/O port of controller MCU, the capacitance signal that controller MCU detects controller MCU carries out calculus of differences with the above-mentioned compensating electrode signal through amplification receiving, the result of calculus of differences and predetermined threshold value are compared, if the result of calculus of differences is more than or equal to predetermined threshold value, controller MCU judges that this button is pressed.
Because capacitance type touch key of the present invention has the circuit that compensates of parasitic capacitance to producing, compensate thereby can the interference that factor produces such as stain to environment temperature, humidity, surface, ensure that the sensitivity of button is not subject to the impact of environment.
Brief description of the drawings
Cap-sensor basic principle schematic in Fig. 1 prior art;
Fig. 2 (a) and 2(b) compensation principle of cap-sensor;
Fig. 3 cap-sensor compensating electrode;
Fig. 4 cap-sensor compensating circuit.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not entire infrastructure.
Fig. 2 (a) and 2(b) show the compensation principle of cap-sensor of the present invention.Inventor's discovery, as Fig. 2 (a) with 2(b), the size that cap-sensor sensitivity is subject to the impact of the factor such as environment temperature, humidity can characterize by the parasitic capacitance Cp existing between induction electrode and ground.In the time of finger touch induction electrode, not only can produce inductance capacitance Cf, also can produce parasitic capacitance Cp, the capacitor C s that controller MCU detects is not only inductance capacitance Cf, should be in fact inductance capacitance Cf and parasitic capacitance Cp sum, i.e. Cs=Cf+Cp.In the time of finger presses button, press with inductance capacitance Cf and exist corresponding relation, but because the size of parasitic capacitance Cp is subject to the impact of the factors vary such as environment temperature, humidity, the capacitor C s that controller MCU detects under different environment might not be identical, this causes the sensitivity of controller MCU button in the time judging whether button is pressed to be affected, and whether controller MCU is pressed and does sometimes the judgement making mistake button.
Based on above-mentioned discovery, the present invention has designed cap-sensor compensating electrode figure as shown in Figure 3.As shown in Figure 3, a series of touch key-presss are distributed on PCB printed circuit board (PCB), there is accordingly an induction electrode and a compensating electrode with each touch key-press, compensating electrode is connected with a compensating circuit (amplifier in figure), and the output signal of each compensating circuit is connected with controller MCU by I/O port respectively, further carries out the processing of related data in controller MCU.
The circuit theory diagrams of cap-sensor compensating circuit of the present invention as shown in Figure 4.This compensating circuit comprises: operational amplifier U1A, an one input is connected with the output of compensating electrode, another input is connected between resistance R 1 and the tie point of resistance R 2, the other end ground connection of resistance R 1, the other end of resistance R 2 is connected with the output of operational amplifier U1A, and the output of operational amplifier U1A is connected to the I/O port of controller MCU.Further, resistance R 1 and resistance R 2 can adopt the resistance of 1K Ω.Preferably, it is for example the amplifier of AD822AN that operational amplifier can adopt model, and the multiplication factor of amplifier is adjustable to meet actual needs.Further, the capacitance signal that controller MCU is detected and the output signal of compensating circuit are carried out difference computing, and difference result of calculation and a predetermined threshold value are compared, if difference result of calculation is more than or equal to described predetermined threshold value, judge that button is pressed, otherwise, judge that button is not pressed.By cap-sensor is carried out to compensation as above, can eliminate the problem of the button sensitivity change producing due to the difference of parasitic capacitance Cp under varying environment, ensure controller MCU judges according to finger presses whether button is pressed, thereby ensured the sensitivity of button.
The present invention also provides the compensation method of cap-sensor, the method comprises the steps: correspondingly with each button in key circuit a compensating electrode to be set for detection of the parasitic capacitance existing between the induction electrode of each button and ground, the compensating signal detecting is amplified and send to controller MCU by the I/O port of controller MCU, the capacitance signal that controller MCU is detected carries out calculus of differences with the above-mentioned compensating signal through amplification receiving, the result of calculus of differences and predetermined threshold value are compared, if the result of calculus of differences is more than or equal to predetermined threshold value, controller MCU judges that this button is pressed.Further, if the result of calculus of differences is less than predetermined threshold value, controller MCU judges that this button is not pressed.
It should be noted that, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out to one skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (11)
1. a cap-sensor circuit, comprising: at least one button, with the corresponding induction electrode of each button, controller MCU; Characterized by further comprising at least one for detect respectively the compensating electrode of the parasitic capacitance existing between each induction electrode and ground and with the corresponding compensating circuit of each compensating electrode, the signal that wherein each compensating circuit is respectively used to the corresponding compensating electrode to detecting amplifies, the capacitance signal that controller MCU utilizes the compensating signal of compensating circuit output to detect controller MCU compensates, the inductance capacitance value signal being produced to obtain pressing keys.
2. cap-sensor circuit as claimed in claim 1, is characterized in that, each compensating circuit comprises: compensating electrode, operational amplifier, resistance R 1, resistance R 2; Wherein operational amplifier input is connected with the output of compensating electrode, another input is connected between resistance R 1 and the tie point of resistance R 2, the other end ground connection of resistance R 1, the other end of resistance R 2 is connected with the output of operational amplifier, and the output of operational amplifier is connected to the I/O port of controller MCU.
3. cap-sensor circuit as claimed in claim 2, it is characterized in that: together with the compensating signal of the capacitance signal that controller MCU detects controller MCU and the operational amplifier receiving output, carry out difference computing, and the result of difference computing and a predetermined threshold value are compared.
4. cap-sensor circuit as claimed in claim 3, it is characterized in that: in the time that the result of difference computing is more than or equal to a predetermined threshold value, controller MCU judges that button is pressed, and in the time that the result of difference computing is less than a predetermined threshold value, controller MCU judges that button is not pressed.
5. the cap-sensor circuit as described in claim 1-4 any one, is characterized in that: the amplification coefficient of this operational amplifier is adjustable.
6. the compensating circuit of a cap-sensor sensitivity, comprise: compensating electrode, operational amplifier, resistance R 1, resistance R 2, wherein operational amplifier input is connected with the output of compensating electrode, another input is connected between resistance R 1 and the tie point of resistance R 2, the other end ground connection of resistance R 1, the other end of resistance R 2 is connected with the output of operational amplifier, and the output of operational amplifier is connected to the I/O port of controller MCU.
7. compensating circuit as claimed in claim 6, it is characterized in that: together with the compensating signal of the capacitance signal that controller MCU detects the controller MCU receiving and operational amplifier output, carry out difference computing, and the result of difference computing and a predetermined threshold value are compared.
8. compensating circuit as claimed in claim 7, it is characterized in that: in the time that the result of difference computing is more than or equal to a predetermined threshold value, controller MCU judges that button is pressed, and in the time that the result of difference computing is less than a predetermined threshold value, controller MCU judges that button is not pressed.
9. the compensating circuit as described in claim 6-8 any one, is characterized in that: the amplification coefficient of this operational amplifier is adjustable.
10. the compensation method of a cap-sensor sensitivity, the method comprises the steps: correspondingly with each button in key circuit a compensating electrode to be set for detection of the parasitic capacitance existing between the induction electrode of each button and ground, the signal of the compensating electrode detecting is amplified and send to controller MCU by the I/O port of controller MCU, the capacitance signal that controller MCU detects controller MCU carries out calculus of differences with the above-mentioned compensating electrode signal through amplification receiving, the result of calculus of differences and predetermined threshold value are compared, if the result of calculus of differences is more than or equal to predetermined threshold value, controller MCU judges that this button is pressed.
11. compensation methodes as claimed in claim 10, is characterized in that: if the result of calculus of differences is less than predetermined threshold value, controller MCU judges that this button is not pressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210580876.9A CN103905024A (en) | 2012-12-27 | 2012-12-27 | Button circuit for improving sensitivity of capacitance induction button, and compensation circuit and compensation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210580876.9A CN103905024A (en) | 2012-12-27 | 2012-12-27 | Button circuit for improving sensitivity of capacitance induction button, and compensation circuit and compensation method thereof |
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| CN103905024A true CN103905024A (en) | 2014-07-02 |
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| CN201210580876.9A Pending CN103905024A (en) | 2012-12-27 | 2012-12-27 | Button circuit for improving sensitivity of capacitance induction button, and compensation circuit and compensation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306037A (en) * | 2015-11-26 | 2016-02-03 | 罗中良 | Touch key and identification control method thereof |
| CN106033965A (en) * | 2015-03-16 | 2016-10-19 | 炬芯（珠海）科技有限公司 | Touch button detection circuit and detection method thereof |
| CN109238314A (en) * | 2018-07-17 | 2019-01-18 | 上海阿柚信息科技有限公司 | For the detection method and device close to induction |
| CN110048703A (en) * | 2019-04-18 | 2019-07-23 | 珠海格力电器股份有限公司 | A kind of method, apparatus and terminal device improving touch key-press sensitivity |
| CN110286787A (en) * | 2015-04-07 | 2019-09-27 | 原相科技股份有限公司 | Control chip and its operation method for touch panel |
| CN110471578A (en) * | 2018-05-09 | 2019-11-19 | 恩智浦美国有限公司 | The capacitive sensing circuit of humidity compensation |
| CN110793150A (en) * | 2019-11-18 | 2020-02-14 | 珠海格力电器股份有限公司 | Adaptive adjustment method of capacitive touch key, wire controller and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106033965A (en) * | 2015-03-16 | 2016-10-19 | 炬芯（珠海）科技有限公司 | Touch button detection circuit and detection method thereof |
| CN106033965B (en) * | 2015-03-16 | 2019-05-14 | 炬芯（珠海）科技有限公司 | A kind of touch key-press detection circuit and its detection method |
| CN110286787A (en) * | 2015-04-07 | 2019-09-27 | 原相科技股份有限公司 | Control chip and its operation method for touch panel |
| CN110286787B (en) * | 2015-04-07 | 2023-08-04 | 原相科技股份有限公司 | Control chip for touch panel and operation method thereof |
| CN105306037A (en) * | 2015-11-26 | 2016-02-03 | 罗中良 | Touch key and identification control method thereof |
| CN110471578A (en) * | 2018-05-09 | 2019-11-19 | 恩智浦美国有限公司 | The capacitive sensing circuit of humidity compensation |
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| CN110048703A (en) * | 2019-04-18 | 2019-07-23 | 珠海格力电器股份有限公司 | A kind of method, apparatus and terminal device improving touch key-press sensitivity |
| CN110793150A (en) * | 2019-11-18 | 2020-02-14 | 珠海格力电器股份有限公司 | Adaptive adjustment method of capacitive touch key, wire controller and air conditioner |
| CN110793150B (en) * | 2019-11-18 | 2020-10-27 | 珠海格力电器股份有限公司 | Adaptive adjustment method of capacitive touch key, wire controller and air conditioner |
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Application publication date: 20140702 |