CN102375628A - Capacitance detecting method - Google Patents
Capacitance detecting method Download PDFInfo
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- CN102375628A CN102375628A CN2010102547359A CN201010254735A CN102375628A CN 102375628 A CN102375628 A CN 102375628A CN 2010102547359 A CN2010102547359 A CN 2010102547359A CN 201010254735 A CN201010254735 A CN 201010254735A CN 102375628 A CN102375628 A CN 102375628A
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Abstract
The invention relates to a capacitance detecting method which comprises the following steps of: charging capacitance to be detected by voltage according to a pulse signal; calculating the charging time of the voltage reaching critical voltage of the capacitance to be detected; and judging the change of the capacitance to be detected according to the charging time. By using the capacitance detecting method disclosed by the invention, the aims of improving the noise inhibiting effect and increasing the change tolerance of capacitance and impedance on a process can be achieved.
Description
Technical field
The present invention relates to capacitance determining method.
Background technology
Touch-control device is a kind of actuation means, and it can detect touch position or the touching dynamics of user on a device.Because the control mode of touch-control device (a for example touch panel) is more directly perceived than general mouse and keyboard, so unconventional computer user one can be provided simpler computation interface.Therefore, early stage touch-control device is applied to general public place mostly, like devices such as computer-aided instruction terminating machine, guide to visitors device and automatic teller machines, to replace the configuration of manpower.Along with scientific-technical progress; The user also day by day improves for the requirement of operation intuitive; So also visible mobile electronic devices such as mobile phone, personal digital assistant and handheld game device, extensive degree of visible touch-control device application surface of being applied to of recent touch-control device.
The detection mode of touch-control device is quite various, generally can be divided into resistance-type, condenser type, sonar formula, infrared-type, strain gage type and optical profile type etc.Cause change on the electric capacity to determine this touch position or touching dynamics when wherein, capacitance touching control formula device is according to object touching or near this device.Capacitance touching control formula device has many advantages, and for example capacitance touching control formula device only can produce reaction, for example people's finger according to conductible object.In addition, capacitance touching control formula device is sharp compared to electric resistance touch-control formula device reaction, and reaction velocity is very fast.
In view of the above, the change that how to detect electric capacity promptly becomes the key of capacitance touching control formula device.Fig. 1 show a prior art capacitance determining method.As shown in Figure 1, in step 102, with electric current one testing capacitance is charged, and get into step 104 according to a pulse signal.In step 104, the voltage of this testing capacitance of inspection after a set time, and get into step 106.In step 106, judge the variation of this testing capacitance according to the voltage of this testing capacitance.
Fig. 2 shows the capacitance determining method according to Fig. 1, the graph of a relation of this pulse signal and this testing capacitance voltage.As shown in Figure 2, when no external object touches capacitance touching control formula device, the equivalent capacity of this capacitance touching control formula device, that is testing capacitance is C.Therefore, according to step 104, after the set time, this testing capacitance can be recharged to a reference voltage VR.On the other hand, when external object touched capacitance touching control formula device, this external object can make the equivalent capacity of this capacitance touching control formula device increase.Therefore, according to step 104, after the set time, this testing capacitance can only be recharged to V1, V1＜VR wherein, and Δ V is both poor.Then,, can judge the variation of this testing capacitance, whether for example judge Δ V greater than a critical value, and then judge whether the existence of an external object according to the voltage of this testing capacitance in step 106.
Yet there is the shortcoming of the following stated in capacitance determining method shown in Figure 1.Fig. 3 shows the capacitance determining method according to Fig. 1, another graph of a relation of this pulse signal and this testing capacitance voltage.As shown in Figure 3, if in the process that this testing capacitance is charged, meet with the external environment noise, then the voltage of this testing capacitance may be recharged to V2 or V3, wherein V2＜V1＜V3＜VR.That is, maybe be to the voltage difference of this testing capacitance and reference voltage VR between Δ V
1With Δ V
2Between, Δ V wherein
1=VR-V3, Δ V
2=VR-V2.If the voltage of this testing capacitance is to utilize its magnitude of voltage of analog to digital converter decision, then this kind external environment noise will cause the voltage quasi position mistake in judgment of analog to digital converter, and make last voltage transitions intensity occurrence of errors.
In view of the above, industry is needed to be a kind of capacitance determining method, and it has noise suppression effect avoiding losing accurate problem because of the external environment noise causes capacitance detecting, and the variation tolerance that can promote electric capacity and impedance on the technology simultaneously is with the improvement process yield.
Summary of the invention
To the problem that exists in the prior art, the object of the present invention is to provide a kind of capacitance determining method, it no longer is to change with the resolution different voltages with different to detect capacitance variations, but detects capacitance variations through the mode that converts frequency domain and time domain to.In view of the above, the detection change in voltage of variation replacement prior art that can be through detecting pulse bandwidth and quantity, and then reach detection with the prior art simulation field and change into field and judge.
Capacitance determining method according to one embodiment of the invention comprises the following step: one testing capacitance is charged with voltage according to a pulse signal; Duration of charging when the voltage that calculates this testing capacitance reaches a critical voltage; And the variation of judging this testing capacitance according to this in duration of charging.
Capacitance determining method according to another embodiment of the present invention comprises the following step: one testing capacitance is charged with voltage according to a pulse signal; Duration of charging when the voltage that calculates this testing capacitance reaches a critical voltage; The step that repeats this charging, this calculating duration of charging and this discharge is to obtain many groups duration of charging; And according to the said variations of organizing these testing capacitances of duration of charging judgement more.
Beneficial effect of the present invention is, capacitance determining method of the present invention can reach noise suppression effect and the purpose that promotes the variation tolerance of electric capacity and impedance on the technology.
Preceding text are sketch out technical characterictic of the present invention, so that the detailed description of hereinafter is able to obtain preferable understanding.Other technical characterictic that constitutes claim target of the present invention will be described in hereinafter.Person skilled should be understood under the present invention, and the notion that hereinafter discloses can be used as the basis with specific embodiment and revises or design other structure or technology quite easily and realize the purpose identical with the present invention.Person skilled also should be understood under the present invention, and the construction of this type equivalence also can't break away from the spirit and scope of the present invention that accompanying Claim proposes.
Description of drawings
Fig. 1 shows the capacitance determining method of a prior art;
Fig. 2 shows the capacitance determining method according to a prior art, the graph of a relation of its pulse signal and testing capacitance voltage;
Fig. 3 shows the capacitance determining method according to a prior art, another graph of a relation of its pulse signal and testing capacitance voltage;
Fig. 4 shows the process flow diagram of the capacitance determining method of one embodiment of the invention;
Fig. 5 shows the capacitance determining method according to one embodiment of the invention, the graph of a relation of its pulse signal and testing capacitance voltage;
Fig. 6 shows the capacitance determining method according to one embodiment of the invention, another graph of a relation of its pulse signal and testing capacitance voltage;
Fig. 7 shows the capacitance determining method according to one embodiment of the invention, a graph of a relation again of its pulse signal and testing capacitance voltage;
Fig. 8 shows the capacitance determining method according to one embodiment of the invention, the another graph of a relation of its pulse signal and testing capacitance voltage; And
Fig. 9 shows the process flow diagram of the capacitance determining method of another embodiment of the present invention.
Wherein, description of reference numerals is following:
102～106 steps
402～406 steps
902～910 steps
Embodiment
The present invention is a kind of capacitance determining method in this direction of inquiring into.In order to understand the present invention up hill and dale, detailed step will be proposed in following description.Apparently, execution of the present invention is not defined in the specific details that person skilled of the present invention is had the knack of.On the other hand, well-known step is not described in the details, with the restriction of avoiding causing the present invention unnecessary.Preferred embodiment meeting of the present invention is described in detail as follows, yet except these detailed descriptions, the present invention can also be implemented among other the embodiment widely, and protection scope of the present invention constrained not, and it is as the criterion with claim.
The touch-control device of indication of the present invention be meant that an object touches or near the time can produce capacity effect; And the various devices that the equivalent capacity that makes this touch-control device changes; Touch panel for example; Or the touch pads on the notebook computer (touch pad), the induction coil on the well-known multimedia player iPod, or the devices such as plastic shell of metal plated film.
Fig. 4 shows the process flow diagram of the capacitance determining method of one embodiment of the invention.As shown in Figure 4, in step 402, with voltage one testing capacitance is charged, and get into step 404 according to a pulse signal.In step 404, the duration of charging the when voltage that calculates this testing capacitance reaches a critical voltage, and get into step 406.In step 406, judge the variation of this testing capacitance according to this duration of charging.The capacitance determining method of contrast prior art, the capacitance determining method of present embodiment is with voltage, but not electric current is to this testing capacitance charging.In addition, the capacitance determining method of present embodiment is with time modulation system duration of charging relatively, but not in the set time voltage of this testing capacitance relatively.In view of the above, can reach noise suppression effect and the purpose that promotes the variation tolerance of electric capacity and impedance on the technology.
Fig. 5 shows the capacitance determining method according to Fig. 4, the graph of a relation of this pulse signal and this testing capacitance voltage, and wherein this capacitance determining method is applied to (a for example capacitance touching control formula panel) on the capacitance touching control formula device.As shown in Figure 5, when no external object (for example finger) when touching capacitance touching control formula device, the equivalent capacity of this capacitance touching control formula device, that is testing capacitance is C.According to step 404, the duration of charging of (for example reference voltage VR) was T when the voltage of this testing capacitance reached a critical voltage
1On the other hand, when external object touched capacitance touching control formula device, this external object can make the equivalent capacity of this capacitance touching control formula device increase, that is testing capacitance increases to C ', wherein C '＞C.At this moment, according to step 404, the appearance value of this testing capacitance strengthens and to make charging rate slack-off, so the duration of charging the when voltage of this testing capacitance reaches a critical voltage increases to T
2Then, in step 406, according to the variation of this this testing capacitance of duration of charging judgement, wherein the calculating in duration of charging can be according to the pulse number decision of this pulse signal in this duration of charging.As shown in Figure 5, at T
2Pulse number in time is greater than at T
1Pulse number in time.In view of the above, can determine the variation of this testing capacitance through calculating pulse number, and then judge whether the existence of an external object.
Because capacitance determining method of the present invention is a mode of utilizing the time modulation, thus can adjust the frequency of this critical voltage, this pulse signal or the width of this pulse signal according to user demand, to reach optimized purpose.For example, can be through reducing this critical voltage to reach the purpose of quickening capacitance determining method of the present invention.Fig. 6 shows the capacitance determining method according to Fig. 4, another graph of a relation of this pulse signal and this testing capacitance voltage.As shown in Figure 6, can critical voltage be reduced to V1.In view of the above, the duration of charging the when voltage that can shorten this testing capacitance reaches critical voltage is to accelerate capacitance determining method of the present invention.
The width of frequency or this pulse signal that on the other hand, can be through the adjustment pulse signal is to reach the purpose of squelch.Fig. 7 shows the capacitance determining method according to Fig. 4, a graph of a relation again of this pulse signal and this testing capacitance voltage.As shown in Figure 7; If the frequency of pulse signal is higher than the frequency of external environment noise; Then the charging process of this testing capacitance receives this external environment The noise easily and causes voltage level to change; And then cause the mistake of duration of charging calculating accurate, for example possibly have the different pulse number in the duration of charging.At this moment, can reduce if the frequency of this pulse signal makes its frequency that is lower than the external environment noise, and increase the width of this pulse signal.As shown in Figure 7, because the width of pulse signal increases, even this testing capacitance is subjected to the external environment interference of noise, still remain on charged state, so in the duration of charging, still have the identical pulse number.In view of the above, can effectively reduce the external environment noise.
The width of frequency or this pulse signal that in like manner, also can be through the adjustment pulse signal is with the variation tolerance that promotes electric capacity and impedance on the technology purpose with the improvement process yield.Fig. 8 shows the capacitance determining method according to Fig. 4, the another graph of a relation of this pulse signal and this testing capacitance voltage.As shown in Figure 8, it is not enough and cause different charging curves that this testing capacitance may receive influence or the tolerance of impedance of technology, and make possibly have different pulse numbers in the duration of charging.At this moment, can reduce the frequency of this pulse signal and increase the width of this pulse signal.As shown in Figure 8, because the width of pulse signal increases,, will have the identical pulse number in the duration of charging even this testing capacitance has different charging curves.In view of the above, can promote the variation tolerance of electric capacity and impedance on the technology.
In addition, if will further reduce the external environment noise, can be through repeating repeatedly computation process, on average to fall the influence that noise is brought.Fig. 9 shows the process flow diagram of the capacitance determining method of one embodiment of the invention.As shown in Figure 9, in step 902, with voltage one testing capacitance is charged, and get into step 904 according to a pulse signal.In step 904, the duration of charging the when voltage that calculates this testing capacitance reaches a critical voltage, and get into step 906.In step 906, this testing capacitance charging is discharged, and get into step 908.In step 908, judge whether the multiplicity that reaches predetermined.If not, then get back to step 902, otherwise get into step 910.In step 910, judge the variation of this testing capacitance according to these duration of charging.According to the capacitance determining method of Fig. 9, for example multiplicity is made as 10 times, collocation adjustment critical voltage, the frequency of pulse signal and the width of this pulse signal can reach noise suppression effect and promote the purpose of the variation tolerance of electric capacity and impedance on the technology.
In sum; Capacitance determining method of the present invention charges to a testing capacitance with voltage; And utilize the time modulation system to compare the duration of charging; Determining the variation of this testing capacitance, and can determine a touch-control device according to this whether by object touching, or this object this touch-control device of close enough and its equivalent capacity is changed.In view of the above, capacitance determining method of the present invention can reach noise suppression effect and the purpose that promotes the variation tolerance of electric capacity and impedance on the technology.
Technology contents of the present invention and technical characterstic disclose as above, yet those skilled in the art still maybe be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to embodiment announcement person, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by following claim.
Claims (21)
1. capacitance determining method comprises the following step:
One testing capacitance is charged with voltage according to a pulse signal;
Duration of charging when the voltage that calculates this testing capacitance reaches a critical voltage; And
Judge the variation of this testing capacitance according to this duration of charging.
2. capacitance determining method according to claim 1 is characterized in that, the calculating in this duration of charging is the pulse number according to this pulse signal in this duration of charging.
3. capacitance determining method according to claim 1 is characterized in that, can through the adjustment this critical voltage with the adjustment should the duration of charging.
4. capacitance determining method according to claim 1 is characterized in that the frequency of this pulse signal can be adjusted.
5. capacitance determining method according to claim 1 is characterized in that the width of this pulse signal can be adjusted.
6. capacitance determining method according to claim 1 is characterized in that, said testing capacitance is the electric capacity of a touch-control device.
7. capacitance determining method according to claim 6 is characterized in that, the variation of this testing capacitance is caused by the capacity effect between this touch-control device and an external object.
8. capacitance determining method according to claim 7 is characterized in that, this foreign body is finger.
9. capacitance determining method according to claim 8, it further comprises the following step:
Judged result according to the variation of this testing capacitance judges whether this touch-control device by this finger touches, and maybe this points this touch-control device of close enough.
10. capacitance determining method according to claim 1 is characterized in that, the change amount of the equivalent capacitance value that is changed to this testing capacitance of this testing capacitance.
11. a capacitance determining method comprises the following step:
One testing capacitance is charged with voltage according to a pulse signal;
Duration of charging when the voltage that calculates this testing capacitance reaches a critical voltage;
The step that repeats this charging, this calculating duration of charging and this discharge is to obtain many groups duration of charging; And
Judge the variation of this testing capacitance according to said many group duration of charging.
12. capacitance determining method according to claim 11 is characterized in that, the calculating in this duration of charging is the pulse number according to this pulse signal in this duration of charging.
13. capacitance determining method according to claim 11 is characterized in that, the multiplicity of the step of this charging, this calculating duration of charging and this discharge can be adjusted.
14. capacitance determining method according to claim 11 is characterized in that, can through the adjustment this critical voltage with the adjustment should the duration of charging.
15. capacitance determining method according to claim 11 is characterized in that, the frequency of this pulse signal can be adjusted.
16. capacitance determining method according to claim 11 is characterized in that, the width of this pulse signal can be adjusted.
17. capacitance determining method according to claim 11 is characterized in that, said testing capacitance is the electric capacity of a touch-control device.
18. capacitance determining method according to claim 17 is characterized in that, the variation of this testing capacitance is caused by the capacity effect between this touch-control device and an external object.
19. capacitance determining method according to claim 18 is characterized in that, this foreign body is finger.
20. capacitance determining method according to claim 19, it further comprises the following step:
Judged result according to the variation of this testing capacitance judges whether this touch-control device by this finger touches, and maybe this points this touch-control device of close enough.
21. capacitance determining method according to claim 11 is characterized in that, the change amount of the equivalent capacitance value that is changed to this testing capacitance of this testing capacitance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102547359A CN102375628A (en) | 2010-08-17 | 2010-08-17 | Capacitance detecting method |
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| CN2010102547359A CN102375628A (en) | 2010-08-17 | 2010-08-17 | Capacitance detecting method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014059628A1 (en) * | 2012-10-17 | 2014-04-24 | 华为技术有限公司 | Supercapacitor testing method, device and circuit |
| WO2016029435A1 (en) * | 2014-08-29 | 2016-03-03 | 深圳市倍轻松科技股份有限公司 | Intelligent health detection circuit and detection watch |
| CN108828322A (en) * | 2018-05-09 | 2018-11-16 | 淮安信息职业技术学院 | A kind of low capacity capacitor high-speed detection circuit |
| CN109283410A (en) * | 2018-09-11 | 2019-01-29 | 长鑫存储技术有限公司 | Capacity measurement device and forming method thereof |
| CN109900365A (en) * | 2019-03-13 | 2019-06-18 | 深圳通感微电子有限公司 | Method and infrared detection device existing for a kind of judgement human body |
| CN111076288A (en) * | 2019-12-18 | 2020-04-28 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and control method thereof |
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| US20060170658A1 (en) * | 2005-02-03 | 2006-08-03 | Toshiba Matsushita Display Technology Co., Ltd. | Display device including function to input information from screen by light |
| CN101387772A (en) * | 2007-09-14 | 2009-03-18 | 群康科技(深圳)有限公司 | Touch control display panel, display and mobile phone |
| CN101738543A (en) * | 2008-11-05 | 2010-06-16 | 笙泉科技股份有限公司 | Anti-interference capacitor detection device and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060170658A1 (en) * | 2005-02-03 | 2006-08-03 | Toshiba Matsushita Display Technology Co., Ltd. | Display device including function to input information from screen by light |
| CN101387772A (en) * | 2007-09-14 | 2009-03-18 | 群康科技(深圳)有限公司 | Touch control display panel, display and mobile phone |
| CN101738543A (en) * | 2008-11-05 | 2010-06-16 | 笙泉科技股份有限公司 | Anti-interference capacitor detection device and method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014059628A1 (en) * | 2012-10-17 | 2014-04-24 | 华为技术有限公司 | Supercapacitor testing method, device and circuit |
| WO2016029435A1 (en) * | 2014-08-29 | 2016-03-03 | 深圳市倍轻松科技股份有限公司 | Intelligent health detection circuit and detection watch |
| CN108828322A (en) * | 2018-05-09 | 2018-11-16 | 淮安信息职业技术学院 | A kind of low capacity capacitor high-speed detection circuit |
| CN108828322B (en) * | 2018-05-09 | 2024-02-06 | 江苏电子信息职业学院 | High-speed detection circuit of low-capacity capacitor |
| CN109283410A (en) * | 2018-09-11 | 2019-01-29 | 长鑫存储技术有限公司 | Capacity measurement device and forming method thereof |
| CN109283410B (en) * | 2018-09-11 | 2024-01-23 | 长鑫存储技术有限公司 | Capacitance test device and forming method thereof |
| CN109900365A (en) * | 2019-03-13 | 2019-06-18 | 深圳通感微电子有限公司 | Method and infrared detection device existing for a kind of judgement human body |
| CN111076288A (en) * | 2019-12-18 | 2020-04-28 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and control method thereof |
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Application publication date: 20120314 |