CN201113965Y - Touch control induction circuit - Google Patents
Touch control induction circuit Download PDFInfo
- Publication number
- CN201113965Y CN201113965Y CNU2007200525378U CN200720052537U CN201113965Y CN 201113965 Y CN201113965 Y CN 201113965Y CN U2007200525378 U CNU2007200525378 U CN U2007200525378U CN 200720052537 U CN200720052537 U CN 200720052537U CN 201113965 Y CN201113965 Y CN 201113965Y
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- Prior art keywords
- touch
- circuit
- induction circuit
- resistance
- comparator
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- 230000006698 induction Effects 0.000 title claims description 34
- 239000003990 capacitor Substances 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 7
- 229910052755 nonmetal Inorganic materials 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000005669 field effect Effects 0.000 abstract 2
- 230000010354 integration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
A touch sensing circuit comprises a touch sensing circuit and a conditioning circuit which are connected in series, wherein the input end of the touch sensing circuit is connected with a pulse signal input end, the output end of the touch sensing circuit is connected with the input end of the conditioning circuit, and the output end of the conditioning circuit is connected with an MCU unit. The touch sensing circuit comprises a touch sensing sheet K, resistors R1 and R2 and a junction field effect transistor Q1; one electrode of the touch sensing sheet K is connected to the pulse signal input end, and the other electrode of the touch sensing sheet K is connected with the G pole of Q1; one end of the resistor R1 is grounded, and the other end of the resistor R1 is connected with the G pole of the Q1; one end of the resistor R2 is connected with a power supply VCC, the other end is connected with the D pole of the Q1, and the S pole of the Q1 is grounded. The utility model provides a circuit design is fairly simple, only comprises a plurality of resistance, electric capacity and junction field effect transistor, and this circuit has characteristics such as simple and practical, safe and reliable, cost of manufacture are low, adaptability is good. It has no strict requirement on whether the surface material is transparent or not, and for different surface materials, the parameters of R1 only need to be adjusted.
Description
Technical field
The utility model relates to a kind of touch control induction circuit, and the particularly a kind of touch control induction circuit that can experience the human finger activation signal and be identified as key information under the situation of being isolated by glass, pottery or plastic cement belongs to the household electrical appliance electronic technology field.
Background technology
At present, be used for the touch-control circuit on the household appliances, especially for the touch-control circuit on the electromagnetic oven all is the single electrode trigger-type basically, the voltage signal change that sort circuit produces is more weak, is roughly tens millivolts, need increase signal amplification circuit in subsequent conditioning circuit, transmission process again after the signal amplification, the circuit structure complexity, the cost height, touch sensible sensitivity is little.
Our company discloses the touch control induction circuit that uses in a kind of electromagnetic oven at China Patent No. ZL200420047169.4, include input modulate circuit, sensor circuit, integration output circuit, wherein the input of sensor circuit is connected with the output of input modulate circuit, and the output of sensor circuit is connected with the input of integration output circuit.The input modulate circuit includes resistance R 1, capacitor C 1, diode D1, D2, and sensor circuit includes resistance R 2 and sensing chip K, and the integration output circuit includes resistance R 3, capacitor C 2, and the input of input modulate circuit is a square-wave signal, and duty ratio is not less than 50%.When finger touches the sensing chip induction region, the electric capacity that forms between sensing chip and finger will make the voltage of the output of integration output circuit change, this changes after amplifying circuit amplifies, carry out sampling processing by MCU, realization is identified as key information with the finger touch induction of signal, and then realizes the operation control to electromagnetic oven.This touch control induction circuit, remain voltage signal change a little less than, just can handle after need amplifying by amplifying circuit, be necessary further to improve and perfect.
The utility model content
The purpose of this utility model aim to provide a kind of can sensitive induction human finger contact information and be converted into voltage signal variation, discern and operate the touch control induction circuit of control by microcontroller, to overcome weak point of the prior art.
A kind of touch control induction circuit by this purpose design, the touch induction circuit and the modulate circuit that comprise serial connection, the input of touch induction circuit is connected with pulse signal input terminal, the output of touch induction circuit is connected with the input of modulate circuit, the output of modulate circuit is connected with the MCU unit, it is characterized in that touch induction circuit includes touch-control sensing sheet K, resistance R 1, R2 and technotron Q1; The electrode of touch-control sensing sheet K is connected to pulse signal input terminal, and another electrode extremely links to each other with the G of Q1; Resistance R 1 one end ground connection, the other end extremely links to each other with the G of Q1; Resistance R 2 one termination power VCC, the other end extremely links to each other with the D of Q1, the S utmost point ground connection of Q1.
Described modulate circuit comprises resistance R 3, R4 and R5, capacitor C 1, C2 and comparator A1; Capacitor C 1 one ends and comparator A1 are anodal to be connected, the other end with connect comparator A1 negative pole after resistance R 4 is connected; Resistance R 5 is connected in parallel between the negative pole and power supply VCC of comparator A1; Resistance R 3 is connected in parallel between the output and power vd D of comparator A1; Capacitor C 2 is connected between the output and ground of comparator A1, and output is connected with the MCU unit.
The signal of described pulse signal generating unit emission is a square-wave signal.Its frequency is 100kHz～400kHz; The duty ratio of square-wave signal is 60%～90%.
Modulate circuit in the utility model is adjusted to adapt to the sampling request of MCU the output signal of touch induction circuit.The IN end of touch induction circuit is for pulse input signal, and when finger touched sensing chip, the electric capacity that forms between sensing chip and finger can make the change in voltage of OUT end.This variation is sent to MCU and samples after the modulate circuit adjustment, realizes the finger touch induction of signal is identified as key information, thereby to electromagnetic oven operation control.
When the touch-surface induction region of touch-control sensing sheet K was not pointed contact, the square wave of input input transmitted Q1 via K, and the distributed capacitance that setting touch sensing chip K and Nonconductor surface exist is C
K1, because C
K1Minimum, very faint to the influence of circuit.
When the touch-surface induction region of touch-control sensing sheet K has the finger contact, there is distributed capacitance C between touch-control sensing sheet K and the finger
K2, and C is arranged
K2＞＞C
K1Because C
K2Existence, then K descends the voltage of OUT end.The voltage of OUT end descends and carries out sampling processing by transferring to MCU after the modulate circuit adjustment, thereby can realize by the variation of voltage referring to the identification of the information of touching (contact that comprises finger with leave).
Circuit design in the utility model is fairly simple, only is made up of some resistance, electric capacity and technotron, characteristic such as that this circuit has is simple and practical, safe and reliable, cost of manufacture is low, adaptability is good.Whether transparent nothing is strict with to surfacing for it, and to the different surfaces material, the parameter that only needs to adjust R1 gets final product.Touch-control sensing sheet K wherein has bipolar electrode, can be metal, conductive rubber, and electric conductors such as film do not have other specific (special) requirements.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is the circuit theory diagrams of the utility model one embodiment.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Referring to Fig. 1-Fig. 2, in this touch control induction circuit, the input of touch induction circuit 11 is connected with pulse signal input terminal, and the output of touch induction circuit 11 is connected with the input of modulate circuit 12, and the output of modulate circuit 12 is connected with MCU unit 2.Touch induction circuit 11 includes touch-control sensing sheet K, resistance R 1, R2 and technotron Q1; The electrode of touch-control sensing sheet K is connected to pulse signal input terminal, and another electrode extremely links to each other with the G of Q1.Resistance R 1 one end ground connection, the other end extremely links to each other with the G of Q1.Resistance R 2 one termination power VCC, the other end extremely links to each other with the D of Q1.The S utmost point ground connection of Q1.Touch-control sensing sheet K is metallic conductor, nonmetal electric conductor, conductive rubber or film electric conductor.
Referring to Fig. 3, the square wave generation circuit of pulse signal generating unit 1 utilizes the NE555 time-base circuit to produce the square wave that duty ratio is 80% 160kHz, output signal is sent to MCU unit 2 and handles, 2 bases in MCU unit are to the supervision that level changes, and whether can identify certain key area has finger contact or release.
Claims (6)
1. touch control induction circuit, the touch induction circuit (11) and the modulate circuit (12) that comprise serial connection, the input of touch induction circuit is connected with pulse signal input terminal, the output of touch induction circuit is connected with the input of modulate circuit, the output of modulate circuit is connected with MCU unit (2), it is characterized in that touch induction circuit includes touch-control sensing sheet K, resistance R 1, R2 and technotron Q1; The electrode of touch-control sensing sheet K is connected to pulse signal input terminal, and another electrode extremely links to each other with the G of Q1; Resistance R 1 one end ground connection, the other end extremely links to each other with the G of Q1; Resistance R 2 one termination power VCC, the other end extremely links to each other with the D of Q1, the S utmost point ground connection of Q1.
2. touch control induction circuit according to claim 1 is characterized in that described modulate circuit comprises resistance R 3, R4 and R5, capacitor C 1, C2 and comparator A1; Capacitor C 1 one ends and comparator A1 are anodal to be connected, the other end with connect comparator A1 negative pole after resistance R 4 is connected; Resistance R 5 is connected in parallel between the negative pole and power supply VCC of comparator A1; Resistance R 3 is connected in parallel between the output and power vd D of comparator A1; Capacitor C 2 is connected between the output and ground of comparator A1, and output is connected with the MCU unit.
3. touch control induction circuit according to claim 1 and 2 is characterized in that described touch-control sensing sheet K has bipolar electrode.
4. touch control induction circuit according to claim 3 is characterized in that described touch-control sensing sheet K is metallic conductor, nonmetal electric conductor, conductive rubber or film electric conductor.
5. touch control induction circuit according to claim 1 is characterized in that the signal of generating unit (1) emission of described pulse signal is a square-wave signal.
6. touch control induction circuit according to claim 5, the frequency that it is characterized in that described square-wave signal is 100kHz～400kHz; The duty ratio of square-wave signal is 60%～90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200525378U CN201113965Y (en) | 2007-06-11 | 2007-06-11 | Touch control induction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200525378U CN201113965Y (en) | 2007-06-11 | 2007-06-11 | Touch control induction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113965Y true CN201113965Y (en) | 2008-09-10 |
Family
ID=39965713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200525378U Expired - Fee Related CN201113965Y (en) | 2007-06-11 | 2007-06-11 | Touch control induction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201113965Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106797216A (en) * | 2014-05-22 | 2017-05-31 | S.T.S.R.有限责任公司 | Detection sensor |
-
2007
- 2007-06-11 CN CNU2007200525378U patent/CN201113965Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106797216A (en) * | 2014-05-22 | 2017-05-31 | S.T.S.R.有限责任公司 | Detection sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528300 Penglai Road, Beijiao Town, Shunde District, Guangdong, Foshan Patentee before: Midea Group |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20130611 |