CN110224695A - A kind of hardware waterproof capacitance touch button circuit - Google Patents
A kind of hardware waterproof capacitance touch button circuit Download PDFInfo
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- CN110224695A CN110224695A CN201910428910.2A CN201910428910A CN110224695A CN 110224695 A CN110224695 A CN 110224695A CN 201910428910 A CN201910428910 A CN 201910428910A CN 110224695 A CN110224695 A CN 110224695A
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- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 230000009471 action Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
Abstract
Capacitance touch button is a kind of common user interface apparatus, and sensor is by the capacitor of detection human body to determine whether there is finger touch action；Capacitance sensor appearance is beautiful compared with mechanical key, is easy to use, and the service life is long；But if there are moisture film or water droplets on touch interface, the capacitor of sensor will be changed, it may occur that mistaken touch induction；The present invention provides a kind of hardware waterproof circuit structure, and the influence of water droplet, moisture film to capacitance touch button can be eliminated on the basis of Qtouch capacitance touch button scheme, realizes the water-proof function of Qtouch capacitance touch button.
Description
Technical field
The invention belongs to IC design fields, the waterproof applications for capacitance touch button.
Background technique
Capacitance touch button is a kind of common user interface apparatus, sensor by the capacitor of detection human body to determine whether
There is finger touch action；Capacitance sensor appearance is beautiful compared with mechanical key, is easy to use, and the service life is long；But if touching
There are moisture film or water droplets on interface, will change the capacitor of sensor, it may occur that mistaken touch induction；The present invention provides a kind of hard
Part waterproof circuit structure can eliminate water droplet on the basis of Qtouch capacitance touch button scheme, moisture film presses capacitance touch
The influence of key realizes the water-proof function of Qtouch capacitance touch button.
Fig. 1 is Qtouch capacitance touch button resolution circuitry, and circuit includes: sampling capacitance Cs, sampled voltage node Vc inspection
Slowdown monitoring circuit INV, switch S1, S2, S3, touch electrode；Fig. 2 is Qtouch capacitance touch button working principle diagram, and touch electrode is deposited
In parasitic capacitance, indicated with capacitor Cx, CFFinger increased capacitor, C on touch electrode after being touched for fingerLDTo there is water droplet to exist
Increased capacitor when on touch electrode；Consider that no finger touches and do not have only to connect on the case where water droplet and Cx node first
Capacitor Cx；Qtouch capacitance touch button testing process are as follows: 1, discharge regime, S1, S2 are disconnected, switch S3 closure, by sampling electricity
Pressure node Vc discharges into ground；2, charging stage, switch S1 are disconnected, and S2 closure, S3 is disconnected, and capacitor Cx is charged to VDD；3, it shifts
In the stage, switch S1 closure, S2, S3 are disconnected, in the electric charge transfer to sampling capacitance Cs on capacitor Cx, sampled voltage node Vc voltage
Rise；4, counting stage is detected, whether INV detection sampled voltage node Vc reaches trigging signal, if do not reached, repetition 2,
3,4 step, and internal counter is added 1, if reaching trigging signal, stop operation, counter is kept；If on node Vx
Capacitor increase, then detect terminate hour counter count value become smaller；When finger touches touch electrode, CFIncrease node Vx
Upper capacitor, when there is water droplet on touch electrode, CLDIncrease the capacitor on node Vx；Therefore water droplet will affect capacitance touch by
The work of key, will lead to false triggering when serious；In existing touch key-press waterproofing design generally by the way of software, pass through
Filtering algorithm realizes that filtering algorithm needs to acquire multiple testing result operation, and response speed is slow, and design is complicated.
Summary of the invention
The present invention drives Water-proof electrode voltage follow around Water-proof electrode, and with voltage follow BUF around touch electrode
Touch electrode voltage change eliminates influence of the water droplet to touch electrode, and there are two aspects for main technical point::
1. around Water-proof electrode around touch electrode；
2. driving Water-proof electrode voltage follow touch electrode voltage change with voltage follow BUF.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 Qtouch capacitance touch button scheme；
Fig. 2 Qtouch capacitance touch button working principle diagram；
A kind of hardware waterproof capacitance touch button Fig. 3 of the invention；
Touch key-press water droplet schematic diagram Fig. 4 of the invention；
A kind of hardware waterproof capacitance touch button working principle diagram Fig. 5 of the invention.
Specific embodiment
Below in conjunction with attached drawing, a kind of course of work of hardware waterproof capacitance touch button of disclosure of the invention is described in detail.
Fig. 3 is the water-proof function that a kind of circuit structure of the invention realizes Qtouch capacitance touch button；Circuit includes:
Sampling capacitance Cs, sampled voltage node Vc detection circuit INV, switch S1, S2, S3, voltage follow BUF, Water-proof electrode and touch
Electrode；Touch electrode is round or rectangular electric conductor, is connected to node Vx；Water-proof electrode is the electric conductor around touch electrode,
It is connected to the output node Vs of voltage follow BUF；The input of voltage follow BUF is connected to node Vx, and output node Vs is connected to
Water-proof electrode；Switch S1 connection both ends are connected respectively to node Vx and sampled voltage node Vc；The both ends of switch S2 are separately connected
To node Vx and VDD；The both ends of switch S3 are connected respectively to sampled voltage node Vc and ground；The both ends sampling capacitance Cs are separately connected
To sampled voltage node Vc and ground；The output of INV is connected to sampled voltage node Vc, output node Vo.
Fig. 4 is touch key-press water droplet schematic diagram of the invention, and when key interface is there are when water droplet, water droplet can be covered on touch
Between electrode and Water-proof electrode；Form the capacitor C between touch electrode to Water-proof electrodeLD；Therefore a kind of hardware of the invention
Waterproof capacitance touch button working principle diagram is indicated with Fig. 5；There are parasitic capacitances for touch electrode, are indicated with capacitor Cx, CFFor hand
Refer to finger increased capacitor, C on touch electrode after touchingLDTo have water droplet increased capacitor, C when on touch electrodeEIt is anti-
The parasitic capacitance of water electrode；Testing process is similar with Qtouch capacitance touch button testing process: 1, discharge regime, and S1, S2 are disconnected
It opens, sampled voltage node Vc is discharged into ground by switch S3 closure；2, charging stage, switch S1 are disconnected, and S2 closure, S3 is disconnected, will
Capacitor Cx is charged to VDD；3, transition phase, switch S1 closure, S2, S3 are disconnected, the electric charge transfer on capacitor Cx to sampling capacitance
On Cs, sampled voltage node Vc voltage rises；4, counting stage is detected, whether INV detection sampled voltage node Vc reaches overturning
Level repeats 2,3,4 steps, and internal counter is added 1, if reaching trigging signal, stops grasping if do not reached
Make, counter is kept；Voltage follow BUF is opened in entire detection process, and node Vs voltage follows node Vx voltage always；Cause
Capacitor C caused by this water dropletLDThere is no charge and discharge process, CLDShielded by Water-proof electrode, will not change the capacitor of node Vx to
Realize the effect of waterproof.
In conclusion the present invention is by driving waterproof around Water-proof electrode, and with voltage follow BUF around touch electrode
Electrode voltage follows touch electrode voltage change, shields water droplet capacitor CLDInfluence of the capacitor to touch electrode, realizes hardware
The effect of waterproof, referring now to software algorithm waterproof, hardware waterproof of the invention has detection speed fast, designs simple feature.
Claims (1)
1. a kind of circuit structure, comprising:
A kind of circuit structure realizes the water-proof function of Qtouch capacitance touch button；Circuit includes: sampling capacitance Cs, sampling electricity
Press node Vc detection circuit INV, switch S1, S2, S3, voltage follow BUF, Water-proof electrode and touch electrode；Touch electrode is circle
Shape or rectangular electric conductor, are connected to node Vx；Water-proof electrode is the electric conductor around touch electrode, is connected to voltage follow BUF
Output node Vs；The input of voltage follow BUF is connected to node Vx, and output node Vs is connected to Water-proof electrode；Switch S1 connects
It connects both ends and is connected respectively to node Vx and sampled voltage node Vc；The both ends of switch S2 are connected respectively to node Vx and VDD；Switch
The both ends of S3 are connected respectively to sampled voltage node Vc and ground；The both ends sampling capacitance Cs be connected respectively to sampled voltage node Vc and
Ground；The output of INV is connected to sampled voltage node Vc, output node Vo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910428910.2A CN110224695A (en) | 2019-05-22 | 2019-05-22 | A kind of hardware waterproof capacitance touch button circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910428910.2A CN110224695A (en) | 2019-05-22 | 2019-05-22 | A kind of hardware waterproof capacitance touch button circuit |
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| CN110224695A true CN110224695A (en) | 2019-09-10 |
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| CN201910428910.2A Pending CN110224695A (en) | 2019-05-22 | 2019-05-22 | A kind of hardware waterproof capacitance touch button circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578439A (en) * | 2020-05-27 | 2020-08-25 | 珠海格力电器股份有限公司 | Wet hand detection device, drive-by-wire ware and air conditioner of touch button |
| WO2021088551A1 (en) * | 2019-11-06 | 2021-05-14 | 苏州宝时得电动工具有限公司 | Electric tool and automatic recognition method in electric tool |
| CN114640335A (en) * | 2022-05-09 | 2022-06-17 | 深圳市航顺芯片技术研发有限公司 | Button waterproof circuit, button and electronic equipment |
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| CN111578439A (en) * | 2020-05-27 | 2020-08-25 | 珠海格力电器股份有限公司 | Wet hand detection device, drive-by-wire ware and air conditioner of touch button |
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Application publication date: 20190910 |