CN102364879A - Circuit structure of capacitive touch button - Google Patents
Circuit structure of capacitive touch button Download PDFInfo
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- CN102364879A CN102364879A CN2011101701791A CN201110170179A CN102364879A CN 102364879 A CN102364879 A CN 102364879A CN 2011101701791 A CN2011101701791 A CN 2011101701791A CN 201110170179 A CN201110170179 A CN 201110170179A CN 102364879 A CN102364879 A CN 102364879A
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- peripheral circuit
- circuit structure
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- touch key
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Abstract
The invention relates to a circuit structure of a capacitive touch button. The circuit structure comprises: a main circuit which is used to realize a touch button, a peripheral circuit of a scanning terminal and the peripheral circuit of a reference terminal. The peripheral circuit of the scanning terminal is connected with the peripheral circuit of the reference terminal through the main circuit. In the circuit structure of the capacitive touch button of the invention, because of using an auxiliary circuit, the main circuit can be adjusted through adjusting a capacitance value of the auxiliary circuit. Interference from outside noise can be effectively prevented and a driving capability of the circuit can be effectively raised.
Description
Technical field
The present invention relates to a kind of wire structures of button, refer in particular to a kind of wire structures of touch key-press.
Background technology
Because traditional key-press generally all is mechanical, the user need push and could start corresponding function, so useful life is limited, moreover if button is long service time, plant equipment also can wear out unavoidably.And, not only can overcome above-mentioned shortcoming, saving cost, and can realize man-machine interaction sooner, more easily if can the combination of touch control technology touch-controlled key be replaced traditional mechanical formula button.
Present stage; The circuit structure of touch key-press generally only relates to a main circuit model; Promptly be used to realize the circuit structure of touch key-press, though sort circuit is simple in structure, the structure of this touch key-press is subject to the interference of outside noise; In a single day the interference of outside noise such as electromagnetism, water mark etc. is promptly arranged, just can not effectively judge whether button is touched this moment.So this press-key structure that has only single main circuit model, its anti-interference is very low.Moreover, the press-key structure of single model, its driving force is also very limited, if can not scan with the mode of full signal, the press-key structure of single model can not be adjusted, so driving force also just is restricted.
Therefore need solve above problem for users provide a kind of structure of easier touch key-press.
Summary of the invention
The actual technical problem to be solved of the present invention is how to provide a kind of noise jamming that can effectively prevent that the circuit structure of the capacitance type touch key of driving force can be provided again.
In order to realize above-mentioned purpose of the present invention; The invention provides a kind of circuit structure of capacitance type touch key; Comprise main circuit, scanning end peripheral circuit and the reference edge peripheral circuit of realizing touch key-press, said scanning end peripheral circuit is connected through said main circuit with the reference edge peripheral circuit.
The circuit structure of capacitance type touch key of the present invention; Owing to adopted auxiliary circuit; So can arrive the purpose of regulating main circuit through the capacitance of regulating on the auxiliary circuit, not only can effectively prevent the interference of outside noise, and can effectively improve the driving force of circuit.
Description of drawings
Fig. 1 is the circuit structure diagram according to main circuit according to the invention;
Fig. 2 is the circuit structure diagram according to capacitance type touch key of the present invention;
Fig. 3 is the variation diagram according to capacitance type touch key according to the invention sweep signal before and after adjustment electric capacity.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Please combine with reference to illustrated in figures 1 and 2, the circuit structure of capacitance type touch key of the present invention comprises three parts: the main circuit, scanning end peripheral circuit S and the reference edge peripheral circuit R that realize touch key-press; Wherein said scanning end peripheral circuit S and reference edge peripheral circuit R are auxiliary circuits, and said scanning end peripheral circuit S is connected through said main circuit with reference edge peripheral circuit R.
Said main circuit is an IC internal circuit model, is made up of i.e. one group of circuit of being made up of capacitor C 1 and C2, one group of circuit of being made up of capacitor C 3 and C4 the electric capacity of two groups of two series connection.An end ground connection of every group of circuit wherein, it is on the L end that the other end is connected to the medium-frequency pulse end.Said benchmark peripheral circuit R also is made up of the electric capacity of one group of two series connection, and promptly benchmark peripheral circuit R is made up of with C6 capacitor C 5, one of which end ground connection, and it is on the L end that the other end is connected to the medium-frequency pulse end.Said scanning end peripheral circuit S is made up of the electric capacity of one group of two series connection, and promptly scanning end peripheral circuit S is made up of C7 and C8, and one of which end ground connection, and it is on the L end that the other end is connected to the medium-frequency pulse end.
In the foregoing circuit structure, said S terminal circuit is connected on the touch key-press for the scanning end; Said R terminal circuit is a reference edge, but the external capacitor element, the signal strength signal intensity and the driving force that are used to regulate the S terminal circuit; Said L end is medium-frequency pulse, constitutes another electrode tip of measuring electric capacity.If can guarantee the electrical potential difference of RS is zero, promptly in the main circuit between C1 and the C2 and the electrical potential difference between C3 and the C4 be zero, show that then the effect of the waterproof of this moment, anti-electromagnetic interference is best; Below we specify: suppose that at present the signal saturation value is Ф; If the electrical potential difference of RS is unequal, like electrical potential difference Ur-Us=a (wherein a ≠ 0) of RS, this moment, the scope of signal value just became (a～Ф); Obviously, the size of noise level has just produced influence to signal at this moment.If electrical potential difference Ur-Us=0 of RS, then the scope of signal value just becomes that (0～Ф), at this moment the size of noise level is to almost not influence of signal.And in circuit structure of the present invention, the equal scalable of capacitor C 5, C6, C7 and C8 in R circuit and the S circuit so can reach both purposes of balance through the electrical potential difference of regulating said RS, finally makes the electrical potential difference of RS equate.
The time of at present supposing the run-down circuit is T, and the magnitude of voltage when expiring signal is Vcc, and T=1/RC (wherein R represents resistance, is a constant in this circuit, and C represents electric capacity).Because signal has decay, thus can not scan with the mode that expires signal fully, but we hope can be scan near the mode of full signal, therefore adjust sweep time T and just become very important.Because if T sweep time falls short of, possibly cause can not complete scan, so sweep time, T must be suitably.And can be known by above-mentioned formula just can the gated sweep time T through the electric capacity of regulating on the auxiliary circuit; Make the approaching as far as possible full signal of T sweep time; Please refer to shown in Figure 3, the adjustment before, said circuit does not scan with a lower signal amplitude; The said circuit in adjustment back just can the higher signal amplitude scan, so this method that can regulate the capacitance on auxiliary circuit R circuit and the S circuit can realize improving the driving force of entire circuit.
Claims (9)
1. the circuit structure of a capacitance type touch key comprises main circuit, scanning end peripheral circuit and the reference edge peripheral circuit of realizing touch key-press, and it is characterized in that: said scanning end peripheral circuit is connected through said main circuit with the reference edge peripheral circuit.
2. circuit structure as claimed in claim 1 is characterized in that: said main circuit is an IC internal circuit model.
3. according to claim 1 or claim 2 circuit structure, it is characterized in that: said main circuit is made up of the electric capacity of two groups of two series connection.
4. circuit structure as claimed in claim 3 is characterized in that: an end ground connection of said every group of circuit, the other end is connected on the medium-frequency pulse end.
5. circuit structure as claimed in claim 1 is characterized in that: each is made up of said scanning peripheral circuit and benchmark peripheral circuit the electric capacity of one group of two series connection.
6. like claim 1 or 5 described circuit structures, it is characterized in that: said scanning end peripheral circuit is connected on the touch key-press.
7. circuit structure as claimed in claim 1 is characterized in that: said scanning peripheral circuit and benchmark peripheral circuit all are an end ground connection, and the other end is connected on the medium-frequency pulse end.
8. circuit structure as claimed in claim 1 is characterized in that: said scanning end peripheral circuit and reference edge peripheral circuit all are auxiliary circuits.
9. like claim 1 or 7 or 8 described circuit structures, it is characterized in that: but said reference edge peripheral circuit external capacitor element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101701791A CN102364879A (en) | 2011-06-23 | 2011-06-23 | Circuit structure of capacitive touch button |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101701791A CN102364879A (en) | 2011-06-23 | 2011-06-23 | Circuit structure of capacitive touch button |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102364879A true CN102364879A (en) | 2012-02-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101701791A Pending CN102364879A (en) | 2011-06-23 | 2011-06-23 | Circuit structure of capacitive touch button |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102364879A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104636650A (en) * | 2015-02-05 | 2015-05-20 | 惠州Tcl移动通信有限公司 | Sliding type capacitance fingerprint identification method and system and unblocking method of system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060033508A1 (en) * | 2004-08-16 | 2006-02-16 | Lee Ying L | Linear capacitance measurement and touchless switch |
| US20080127727A1 (en) * | 2005-02-14 | 2008-06-05 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Piezoelectric Sensor Comprising a Thermal Sensor and an Amplifier Circuit |
| CN101783669A (en) * | 2010-01-28 | 2010-07-21 | 苏州瀚瑞微电子有限公司 | Capacitance type touch press key and judging method thereof |
| CN102033673A (en) * | 2011-01-04 | 2011-04-27 | 苏州瀚瑞微电子有限公司 | Capacitance test circuit and method for scanning line of capacitive touch screen and touch screen |
-
2011
- 2011-06-23 CN CN2011101701791A patent/CN102364879A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060033508A1 (en) * | 2004-08-16 | 2006-02-16 | Lee Ying L | Linear capacitance measurement and touchless switch |
| US20080127727A1 (en) * | 2005-02-14 | 2008-06-05 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Piezoelectric Sensor Comprising a Thermal Sensor and an Amplifier Circuit |
| CN101783669A (en) * | 2010-01-28 | 2010-07-21 | 苏州瀚瑞微电子有限公司 | Capacitance type touch press key and judging method thereof |
| CN102033673A (en) * | 2011-01-04 | 2011-04-27 | 苏州瀚瑞微电子有限公司 | Capacitance test circuit and method for scanning line of capacitive touch screen and touch screen |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104636650A (en) * | 2015-02-05 | 2015-05-20 | 惠州Tcl移动通信有限公司 | Sliding type capacitance fingerprint identification method and system and unblocking method of system |
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Application publication date: 20120229 |