CN204068920U - The quick touch switch circuit reliably of a kind of reaction - Google Patents
The quick touch switch circuit reliably of a kind of reaction Download PDFInfo
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- CN204068920U CN204068920U CN201420506981.2U CN201420506981U CN204068920U CN 204068920 U CN204068920 U CN 204068920U CN 201420506981 U CN201420506981 U CN 201420506981U CN 204068920 U CN204068920 U CN 204068920U
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Abstract
The utility model discloses the quick touch switch circuit reliably of a kind of reaction, connecting and composing successively by adopting the multivibrator circuit of the large resistance of small capacitances, frequency-voltage conversion circuit and voltage identificating circuit; Voltage identificating circuit is Schmidt trigger; The CMPRIN pin of the integrated circuit of frequency-voltage conversion circuit is connected with one end of the 5th resistance and the 7th resistance respectively; The other end of the 5th resistance and ground connection; 7th resistance connects 12v power supply; The IOUT pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 4th electric capacity, the 9th resistance and the tenth resistance respectively, and the tenth resistance is connected with the other end of the 5th electric capacity, and the tenth resistance other end is also connected with the input of Schmidt trigger; Schmidt trigger output connects relay.The utility model circuit eliminates mechanical movement and the contact of regular tap, the motion being translated into relay contact with contact, improve mechanical movement and the reliability contacted.
Description
Technical field
The utility model relates to a kind of switching circuit, particularly relates to the quick touch switch circuit reliably of a kind of reaction.
Background technology
The control switch of current many household electrical appliance is all adopt sensitive switch, and due to moving-member, but if the frequency of utilization of sensitive switch switch is higher, the time is longer, switch easily produces the phenomenon of loose contact.
Utility model content
The purpose of this utility model overcomes prior art Problems existing, provides a kind of reaction avoiding producing loose contact phenomenon quick touch switch circuit reliably
The utility model develops a kind of circuit that the humidity of object can be converted to the voltage signal becoming to a certain degree direct ratio with humidity, utilize this circuit can the contact-making surface of human body finger to electrode, by just detecting whether human finger is in key-press status, whether carries out continuous key-press action to the contact-making surface of human finger on electrode.The utility model adopts contact witch to substitute sensitive switch; Owing to not having moving-member, therefore soft-touch control is more reliable, designs a kind of circuit responding to human finger contact, realizes the function of soft-touch control, is used as to substitute sensitive switch application in all fields.
The utility model object is achieved through the following technical solutions
The quick touch switch circuit reliably of a kind of reaction, connects and composes successively by adopting the multivibrator circuit of the large resistance of small capacitances, frequency-voltage conversion circuit and voltage identificating circuit; Voltage identificating circuit is Schmidt trigger;
The multivibrator circuit of the large resistance of described employing small capacitances comprises high input impedance operational amplifier, negative feedback resistor, the first positive feedback resistor, the second positive feedback resistor and capacitor; Negative-feedback circuit is made up of negative feedback resistor and capacitor, and regenerative circuit is made up of the first positive feedback resistor and the second positive feedback resistor; The negative pole of high input impedance operational amplifier is connected with one end of negative feedback resistor and capacitor respectively; The positive pole of high input impedance operational amplifier is connected with one end of the first positive feedback resistor and the second positive feedback resistor respectively, the other end of capacitor and the other end of the second positive feedback resistor ground connection respectively; The other end of the first positive feedback resistor is all connected with the output of operational amplifier with the other end of negative feedback resistor;
Described frequency-voltage conversion circuit comprises integrated circuit, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second capacitor, the 3rd capacitor, the 4th capacitor and the 5th capacitor that voltage to frequency is changed; The CMPRIN pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 5th resistance and the 7th resistance respectively; The other end of the 5th resistance and ground connection; 7th resistance connects 12v power supply; The IOUT pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 4th electric capacity, the 9th resistance and the tenth resistance respectively, 4th electric capacity is all connected with one end of the 5th electric capacity with the other end of the 9th resistance, tenth resistance is connected with the other end of the 5th electric capacity, and the tenth resistance other end is also connected with the input of Schmidt trigger; The VDD pin of the integrated circuit of voltage to frequency conversion connects 12v power supply; The R/C pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 6th resistance and the 3rd electric capacity respectively; The IREF pin of the integrated circuit of voltage to frequency conversion is connected with the 8th resistance one end; 4th electric capacity, the 9th resistance, the 8th resistance are connected with the GND pin of the integrated circuit that the other end of the 3rd electric capacity is all changed with voltage to frequency; The THR pin of the integrated circuit of voltage to frequency conversion is connected with the other end of the second electric capacity and one end of the 4th resistance respectively, and the 4th resistance is all connected with 12v power supply with the other end of the 6th resistance;
Schmidt trigger output connects relay, and Schmidt trigger output exports high potential or low-potential voltage.
For realizing the utility model object further, preferably, the integrated circuit selecting circuit model that described voltage to frequency is changed is LM331AN integrated circuit.
CA3140 operational amplifier selected by described high input impedance operational amplifier.
Described first capacitor is the metal electrode of tape insulation layer.
The resistance value of described negative feedback resistor be 1M Ω ?300M Ω.
The resistance value of described first positive feedback resistor and the second positive feedback resistor be all 20K Ω ?500K Ω.
Described capacitor is made up of to be oppositely arranged two metal electrodes and is formed.
Two described metal electrode interval 0.3 Hao meter ?2 centimetres, be convenient to finger presses.
Relative to prior art, the utility model tool has the following advantages:
1) the utility model circuit eliminates mechanical movement and the contact of regular tap, the motion being translated into relay contact with contact, improve mechanical movement and the reliability contacted.This is because under the environment of relay, actuating force suffered by the contact of contact is that the electric current crossed by coil midstream provides, power each time suffered by switch motion is completely equal, avoid the problem of hand by dynamics size inequality during switch, the contact simultaneously in relay is in the pollution that sealing state avoids contact.
2) the utility model circuit is due to without mechanical movement, is easy to the protection realizing switch contact, can accomplish switch contact is in the protection of inert gas completely, avoids the high-temperature oxydation problem of contact, makes switching process more reliable.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Fig. 2 is practical application circuit diagram of the present utility model.
Embodiment
For better understanding the utility model, below in conjunction with accompanying drawing, the utility model is further described, but execution mode of the present utility model is not limit so.
As shown in Figure 1, the quick touch switch circuit reliably of a kind of reaction, connects and composes successively by adopting the multivibrator circuit of the large resistance of small capacitances, frequency-voltage conversion circuit and voltage identificating circuit; Voltage identificating circuit forms primarily of Schmidt trigger U3;
As shown in Figure 2, the first capacitor C1 adopting the multivibrator circuit of the large resistance of small capacitances to comprise high input impedance operational amplifier U1, negative feedback resistor R1, the first positive feedback resistor R2, the second positive feedback resistor R3 and be made up of two metal electrode DJ1, DJ2; Negative-feedback circuit is made up of negative feedback resistor R1 and the first capacitor C1, the first capacitor C1 by two metal electrode DJ1, DJ2 intervals 2 ?8 centimetres be oppositely arranged and formed; Regenerative circuit forms primarily of the first positive feedback resistor R2 and the second positive feedback resistor R3; The negative pole of high input impedance operational amplifier U1 is connected with one end (metal electrode DJ1) of negative feedback resistor R1 and the first capacitor C1 respectively; The positive pole of high input impedance operational amplifier U1 is connected with one end of the first positive feedback resistor R2 and the second positive feedback resistor R3 respectively, the other end (metal electrode DJ2) of the first capacitor C1 and the other end of the second positive feedback resistor R3 ground connection respectively; The other end of the first positive feedback resistor R2 is all connected with the output of high input impedance operational amplifier U1 with the other end of negative feedback resistor R1.Negative feedback resistor R1 value preferably can be 1M Ω ?300M Ω, in the different electric capacity values of the first capacitor C1, the electric capacity value of the first capacitor C1 and the resistance value of negative feedback resistor determine the time that the electricity of the first capacitor fills jointly, if k is coefficient cycle of oscillation, R is the resistance value of negative feedback resistor R1; C is the electric capacity value of the first capacitor C1; Then T=k × R × C (negative-feedback circuit forms typical RC circuit); T is the time of the cycle of oscillation of multivibrator circuit adopting small capacitances large resistance.Visible, the utility model conveniently can regulate the height of its circuit oscillation frequency by the capacitance size of adjustment first capacitor C1.The minimum value of the electric capacity value of capacitor can be 2pf ?3pf.
High input impedance operational amplifier U1 has higher operating frequency and larger input impedance, and input impedance is generally greater than 1 × 10
12Ω, can select CA3140 operational amplifier, or the operational amplifier of other type selecting function identical.
First capacitor C1 is the metal electrode of tape insulation layer.
The resistance value of negative feedback resistor R1 be 1M Ω ?300M Ω, as in this Fig. 2 execution mode, the resistance value of negative feedback resistor R1 selects 1.2M Ω; The electric capacity that negative feedback resistor R1 and metal electrode DJ1, DJ2 are formed coordinates, and makes to adopt the frequency of oscillation of the multivibrator circuit of the large resistance of small capacitances to be in ten to three ten kilo hertzs, to meet the need of work of frequency-voltage conversion circuit.
The resistance value of the first positive feedback resistor and the second positive feedback resistor can be all 20K Ω ?500K Ω; As in present embodiment, the resistance value of the first positive feedback resistor R2 and the second positive feedback resistor R3 selects 300K Ω and 20K Ω respectively.First positive feedback resistor R2 and the second positive feedback resistor R3 form regenerative circuit, can by 1/4 of the output voltage of high input impedance operational amplifier U1 ?1/2 positive input terminal being input to high input impedance operational amplifier U1.
Frequency-voltage conversion circuit comprises integrated circuit U2, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the second capacitor C2, the 3rd capacitor C3, the 4th capacitor C4, the 5th capacitor C5 of voltage to frequency conversion; Wherein the second capacitor C2 is the bridge connecting multivibrator and FV convertor.The CMPRIN pin of the integrated circuit U2 of voltage to frequency conversion is connected with one end of the 5th resistance R5 and the 7th resistance R7 respectively; The other end of the 5th resistance R5 and ground connection; 7th resistance R7 connects 12v power supply; The IOUT pin of the integrated circuit U2 of voltage to frequency conversion is connected with one end of the 4th electric capacity C4, the 9th resistance and the tenth resistance R10 respectively, 4th electric capacity C4 is connected with one end of the 5th electric capacity C5 with the other end of the 9th resistance, tenth resistance R10 is connected with the other end of the 5th electric capacity C5, and the tenth resistance R10 other end is also connected with the input of Schmidt trigger U3; The VDD pin of the integrated circuit U2 of voltage to frequency conversion connects 12v power supply; The R/C pin of the integrated circuit U2 of voltage to frequency conversion is connected with one end of the 6th resistance R6 and the 3rd electric capacity C3 respectively; The IREF pin of the integrated circuit U2 of voltage to frequency conversion is connected with the 8th resistance R8 one end; 4th electric capacity C4, the 9th resistance, the 8th resistance R8 are connected with the GND pin of the integrated circuit U2 that the other end of the 3rd electric capacity C3 is all changed with voltage to frequency; The THR pin of the integrated circuit U2 of voltage to frequency conversion is connected with one end of the second electric capacity C2 and one end of the 4th resistance R4 respectively, and the 4th resistance R4 is connected with 12v power supply with the other end of the 6th resistance R6.The other end of the second electric capacity C2 is connected with the output of high input impedance operational amplifier U1.
The integrated circuit U2 selecting circuit model that voltage to frequency is changed is LM331AN integrated circuit, or the integrated circuit that other function is identical.
Schmidt trigger U3 output exports high potential or low-potential voltage, and Schmidt trigger U3 output connects relay.
The resistance value of the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the second capacitor C2, the 3rd capacitor C3, the 4th capacitor C4 and the 5th capacitor C5 or capacitance can be selected according to the requirement of the integrated circuit U2 of voltage to frequency conversion; As in the execution mode of Fig. 2, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 select resistance value to be the resistance of 10K Ω, 20K Ω, 1K Ω, 10K Ω, 1K Ω, 25K Ω and 25K Ω respectively; Second capacitor C2, the 3rd capacitor C3, the 4th capacitor C4 and the 5th capacitor C5 select electric capacity to be 470pf, 470pf, 1uF and 1Uf respectively.
During the work of the utility model reaction quick touch switch circuit reliably, by the square-wave oscillating voltage adopting the multivibrator circuit of the large resistance of small capacitances to produce certain frequency, this oscillating voltage falls oscillating voltage by frequency-voltage conversion circuit and is converted to a magnitude of voltage, and this magnitude of voltage makes voltage identificating circuit can not action (can set this magnitude of voltage make voltage identificating circuit can not action).When the finger contact of people is to the metal electrode DJ1 with insulation, during DJ2, owing to containing moisture in the finger of people, make two metal electrode DJ1, dielectric constant between DJ2 changes, thus make metal electrode DJ1, capacitance between DJ2 occurs significantly to change, the electric voltage frequency of the output of multivibrator circuit is changed, pass through frequency-voltage conversion circuit, the change of this electric voltage frequency is converted to the change of a magnitude of voltage, the change triggers voltage identificating circuit of magnitude of voltage, its output state is changed, low-potential voltage as what originally exported, output high-potential voltage is become after change, the change utilizing this output state just can the operating state of control relay or other circuit, realize the function of mechanical switch.
The quick touch switch circuit reliably of reaction is a kind of switching circuit for touching.Wherein metal electrode DJ1, DJ2 is the sheet metal with insulating barrier, and two panels sheet metal is by wrap insulate layer and indicate the position of key switch.This switching circuit eliminates mechanical movement and the contact of regular tap, the motion being translated into relay contact with contact, improve mechanical movement and the reliability contacted.Under the environment of relay, actuating force suffered by the contact of contact is that the electric current crossed by coil midstream provides, power each time suffered by switch motion is completely equal, avoid the problem of hand by dynamics size inequality during switch, contact simultaneously in relay can be in sealing state, avoids the pollution of contact.And the utility model switching circuit is due to without mechanical movement, is easy to the protection realizing switch contact, can accomplishes switch contact is in the protection of inert gas completely, avoid the high-temperature oxydation problem of contact, make switching process more reliable.
Claims (8)
1. the quick touch switch circuit reliably of reaction, is characterized in that being connected and composed successively by the multivibrator circuit adopting the large resistance of small capacitances, frequency-voltage conversion circuit and voltage identificating circuit; Voltage identificating circuit is Schmidt trigger;
The multivibrator circuit of the large resistance of described employing small capacitances comprises high input impedance operational amplifier, negative feedback resistor, the first positive feedback resistor, the second positive feedback resistor and capacitor; Negative-feedback circuit is made up of negative feedback resistor and capacitor, and regenerative circuit is made up of the first positive feedback resistor and the second positive feedback resistor; The negative pole of high input impedance operational amplifier is connected with one end of negative feedback resistor and capacitor respectively; The positive pole of high input impedance operational amplifier is connected with one end of the first positive feedback resistor and the second positive feedback resistor respectively, the other end of capacitor and the other end of the second positive feedback resistor ground connection respectively; The other end of the first positive feedback resistor is all connected with the output of operational amplifier with the other end of negative feedback resistor;
Described frequency-voltage conversion circuit comprises integrated circuit, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second capacitor, the 3rd capacitor, the 4th capacitor and the 5th capacitor that voltage to frequency is changed; The CMPRIN pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 5th resistance and the 7th resistance respectively; The other end of the 5th resistance and ground connection; 7th resistance connects 12v power supply; The IOUT pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 4th electric capacity, the 9th resistance and the tenth resistance respectively, 4th electric capacity is all connected with one end of the 5th electric capacity with the other end of the 9th resistance, tenth resistance is connected with the other end of the 5th electric capacity, and the tenth resistance other end is also connected with the input of Schmidt trigger; The VDD pin of the integrated circuit of voltage to frequency conversion connects 12v power supply; The R/C pin of the integrated circuit of voltage to frequency conversion is connected with one end of the 6th resistance and the 3rd electric capacity respectively; The IREF pin of the integrated circuit of voltage to frequency conversion is connected with the 8th resistance one end; 4th electric capacity, the 9th resistance, the 8th resistance are connected with the GND pin of the integrated circuit that the other end of the 3rd electric capacity is all changed with voltage to frequency; The THR pin of the integrated circuit of voltage to frequency conversion is connected with the other end of the second electric capacity and one end of the 4th resistance respectively, and the 4th resistance is all connected with 12v power supply with the other end of the 6th resistance;
Schmidt trigger output connects relay.
2. the quick touch switch circuit reliably of reaction according to claim 1, it is characterized in that, the integrated circuit selecting circuit model that described voltage to frequency is changed is LM331AN integrated circuit.
3. the quick touch switch circuit reliably of reaction according to claim 1, it is characterized in that, CA3140 operational amplifier selected by described high input impedance operational amplifier.
4. the quick touch switch circuit reliably of reaction according to claim 1, it is characterized in that, described first capacitor is the metal electrode of tape insulation layer.
5. the quick touch switch circuit reliably of reaction according to claim 1, is characterized in that, the resistance value of described negative feedback resistor be 1M Ω ?300M Ω.
6. the quick touch switch circuit reliably of reaction according to claim 1, is characterized in that, the resistance value of described first positive feedback resistor and the second positive feedback resistor be all 20K Ω ?500K Ω.
7. the quick touch switch circuit reliably of reaction according to claim 1, is characterized in that, described capacitor is made up of to be oppositely arranged two metal electrodes and is formed.
8. the quick touch switch circuit reliably of reaction according to claim 8, is characterized in that, two described metal electrode interval 0.3 Hao meter ?2 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420506981.2U CN204068920U (en) | 2014-09-03 | 2014-09-03 | The quick touch switch circuit reliably of a kind of reaction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420506981.2U CN204068920U (en) | 2014-09-03 | 2014-09-03 | The quick touch switch circuit reliably of a kind of reaction |
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| CN204068920U true CN204068920U (en) | 2014-12-31 |
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| CN201420506981.2U Expired - Fee Related CN204068920U (en) | 2014-09-03 | 2014-09-03 | The quick touch switch circuit reliably of a kind of reaction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270134A (en) * | 2014-09-03 | 2015-01-07 | 华南理工大学 | A touch switch circuit with quick and reliable reaction |
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2014
- 2014-09-03 CN CN201420506981.2U patent/CN204068920U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270134A (en) * | 2014-09-03 | 2015-01-07 | 华南理工大学 | A touch switch circuit with quick and reliable reaction |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20141231 Termination date: 20170903 |