CN201518478U - Capacitive touch induction circuit - Google Patents
Capacitive touch induction circuit Download PDFInfo
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- CN201518478U CN201518478U CN2009201892617U CN200920189261U CN201518478U CN 201518478 U CN201518478 U CN 201518478U CN 2009201892617 U CN2009201892617 U CN 2009201892617U CN 200920189261 U CN200920189261 U CN 200920189261U CN 201518478 U CN201518478 U CN 201518478U
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Abstract
The utility model provides a capacitive touch induction circuit which needs no touch chip and has the advantages of simple structure, low cost and high reliability. The circuit comprises a microprocessor (MCU) which comprises a square wave generating unit; the square wave generating unit outputs square wave signals through a first port; the output square wave signals pass through an energy storage capacitor for energy storage and wave modulation and are output back to a second port of the MCU through a rectifier and filer circuit; and the output terminal of the energy storage capacitor is connected with a touch point and a low-level discharge circuit. The capacitive touch induction circuit has the advantages of very low cost and high reliability, and is suitable for being used on small household electrical appliances.
Description
Technical field
The utility model relates to a kind of capacitance touch sensor circuit.
Background technology
At present in capacitive staff touch induction circuit, all is to have adopted special-purpose touch chip to read the signal of staff generally, pass to then in the single-chip microcomputer, move processing by single-chip microcomputer.In actual applications, above technology often is subjected to the cost restriction, is difficult to satisfy the mass application of small household appliances industry.
Summary of the invention
Problem to be solved in the utility model is: a kind of capacitance touch sensor circuit is provided, and this circuit does not need to use touch chip, and it is simple to have a circuit structure, and cost is low, the reliability height.
In order to solve the problems of the technologies described above, the utility model proposes a kind of capacitance touch sensor circuit, comprise microprocessor MCU, described MCU comprises the square wave generating unit, the square wave generating unit is by first port output square-wave signal; The square-wave signal of output feeds back second port to MCU via current rectifying and wave filtering circuit again through storage capacitor energy storage harmonic; Output at storage capacitor is connected with touch point and low level discharge loop.
Preferably: described storage capacitor is first electric capacity, and first port connects first electric capacity;
First electric capacity is connected with the positive pole of first diode of rectification again, and is connected with the negative pole of second diode of a ground connection;
The negative pole of first diode connects second port of MCU, and its negative pole also is connected with filter circuit;
Between first diode and first electric capacity, be provided with the touch point.
Preferably: described MCU is a single-chip microcomputer.It can also be the microprocessor of other types such as DSP.
The beneficial effects of the utility model are as follows:
Compared to existing technology, the solution that the utility model provides a kind of cheapness to touch control reliably, this circuit structure is simple, do not need to use special touch chip, so very low of cost, and the reliability height, be adapted at using on a lot of small household appliances.
Description of drawings
Figure is circuit theory diagrams of the present utility model.
Embodiment
The utility model provides a kind of capacitance touch sensor circuit.Circuit theory diagrams as shown in the figure.
Microprocessor MCU is a single-chip microcomputer, and it comprises the square wave generating unit, and the square wave generating unit is by first port PA1 output square-wave signal.
First port PA1 of MCU connects first capacitor C 1 of energy storage; First capacitor C 1 is connected with the positive pole of first diode D1 of rectification again, and is connected with the negative pole of second diode D2 of a ground connection; The negative pole of first diode D1 connects second port PA0 of MCU, and its negative pole also is connected with filter circuit.Filter circuit is composed in parallel by second capacitor C 2 and first resistance R 1, their a total end ground connection.Between first diode D1 and first capacitor C 1, be provided with touch point PAD.
Because MCU has powerful operation capacity, therefore, can carry out computing in MCU inside, make square wave of first port PA1 output, replace circuit and square-wave.This square wave charges to first capacitor C 1 when high level, carries out rectification by first diode D1 simultaneously, carries out filtering by second capacitor C 2, so obtain voltage V1, MCU detects the value of V1 by second port PA0.First resistance R 1 provides discharge loop for second capacitor C 2.
When first port PA1 was low level, second diode D2 provided discharge loop for first capacitor C 1, so that carry out the charging of next time.
Because human body has certain capacity effect, so, when staff near or when touching touch point PAD, be equivalent to insert electric capacity to the touch point, will cause the variation of V1, MCU compares the V1 of this moment and original voltage, has reached predefined value if change, will be judged as button, thereby carry out certain processing.
In order to insulate and safety, in application, all can add acryl or the glass plate that 2-5mm is thick usually at touch point PAD place.
Claims (3)
1. a capacitance touch sensor circuit comprises microprocessor MCU, it is characterized in that: described MCU comprises the square wave generating unit, and the square wave generating unit is by first port (PA1) output square-wave signal; The square-wave signal of output feeds back second port (PA0) to MCU via current rectifying and wave filtering circuit again through storage capacitor energy storage harmonic; Output at storage capacitor is connected with touch point and low level discharge loop.
2. capacitance touch sensor circuit according to claim 1 is characterized in that: described storage capacitor is first electric capacity (C1), and first port (PA1) connects first electric capacity (C1);
First electric capacity (C1) is connected with the positive pole of first diode (D1) of rectification again, and is connected with the negative pole of second diode (D2) of a ground connection;
The negative pole of first diode (D1) connects second port (PA0) of MCU, and its negative pole also is connected with filter circuit;
Between first diode (D1) and first electric capacity (C1), be provided with touch point (PAD).
3. capacitance touch sensor circuit according to claim 1 is characterized in that: described MCU is a single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201892617U CN201518478U (en) | 2009-09-25 | 2009-09-25 | Capacitive touch induction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201892617U CN201518478U (en) | 2009-09-25 | 2009-09-25 | Capacitive touch induction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201518478U true CN201518478U (en) | 2010-06-30 |
Family
ID=42499201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201892617U Expired - Fee Related CN201518478U (en) | 2009-09-25 | 2009-09-25 | Capacitive touch induction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201518478U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651646A (en) * | 2012-05-03 | 2012-08-29 | 东莞市精诚电能设备有限公司 | Capacitance type touch press key circuits |
| CN105811957A (en) * | 2016-04-22 | 2016-07-27 | 福州福大海矽微电子有限公司 | Capacitive touch sensitive button and digital tube drive multiplexing circuit, and method |
| CN107800419A (en) * | 2016-09-07 | 2018-03-13 | 宏百贸易有限公司 | A kind of button, electronic circuit, keyboard |
| CN112152603A (en) * | 2020-10-10 | 2020-12-29 | 科世达(上海)机电有限公司 | Capacitive touch sensor and control method |
| CN113534937A (en) * | 2020-04-20 | 2021-10-22 | 宁波方太厨具有限公司 | Single-chip microcomputer electrostatic impact reset detection recovery device and control method |
-
2009
- 2009-09-25 CN CN2009201892617U patent/CN201518478U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651646A (en) * | 2012-05-03 | 2012-08-29 | 东莞市精诚电能设备有限公司 | Capacitance type touch press key circuits |
| CN105811957A (en) * | 2016-04-22 | 2016-07-27 | 福州福大海矽微电子有限公司 | Capacitive touch sensitive button and digital tube drive multiplexing circuit, and method |
| CN105811957B (en) * | 2016-04-22 | 2019-03-19 | 福州福大海矽微电子有限公司 | A kind of capacitance touch induced key and charactron driving multiplex circuit and method |
| CN107800419A (en) * | 2016-09-07 | 2018-03-13 | 宏百贸易有限公司 | A kind of button, electronic circuit, keyboard |
| CN113534937A (en) * | 2020-04-20 | 2021-10-22 | 宁波方太厨具有限公司 | Single-chip microcomputer electrostatic impact reset detection recovery device and control method |
| CN112152603A (en) * | 2020-10-10 | 2020-12-29 | 科世达(上海)机电有限公司 | Capacitive touch sensor and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100630 Termination date: 20160925 |