CN204948048U - A kind of button false-touch prevention Power Generation Road - Google Patents
A kind of button false-touch prevention Power Generation Road Download PDFInfo
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- CN204948048U CN204948048U CN201520690294.5U CN201520690294U CN204948048U CN 204948048 U CN204948048 U CN 204948048U CN 201520690294 U CN201520690294 U CN 201520690294U CN 204948048 U CN204948048 U CN 204948048U
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- touch prevention
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Abstract
The utility model provides a kind of button false-touch prevention Power Generation Road, is applicable to push-button switch, comprises: partial pressure unit, be connected with the output of push-button switch, carries out voltage division processing in order to the input signal exported fixed voltage and push-button switch; Charhing unit; Onunit, is connected, in order to determine whether according to input signal to charge to charhing unit with the output of push-button switch and charhing unit; Voltage control unit, is connected with charhing unit, and the magnitude of voltage in order to the output signal to false-touch prevention Power Generation Road controls; Process chip, is connected with voltage control unit, in order to receive the output signal of circuits for triggering, and judges whether to occur button false triggering according to output signal.The utility model can prevent the false triggering of button from operating from hardware, makes full use of triode Q1 turn-on condition different from metal-oxide-semiconductor Q2, longer than the time of delay of general simple RC filter circuit also more effective.
Description
Technical field
The utility model relates to field of electronic devices, particularly relates to a kind of button false-touch prevention Power Generation Road.
Background technology
Along with reducing of electronic product volume, the close integrated level of button is also more and more higher, and people often touch other buttons when execution shutdown and cause false touch, or single button is repeatedly triggered.The part button of some electronic product is at a distance of too near, and when we go to operate one of them button, our hand touches another button possibly.If shift knob in most of electronic products and reboot button position are at a distance of closer, can cause false touch when shutting down to reboot button, the action made the mistake.
For now, usually false-touch prevention circuit is adopted for the problems referred to above, and existing false-touch prevention circuit is most pull-up resistor and suction ripple electric capacity of just increasing, not very large to the functionality of stabilization, the stabilization waveform that easy appearance is larger, can not the well shake that causes of elimination false triggering when there is false triggering state.
Utility model content
In view of the above problems, the application describes a kind of button false-touch prevention Power Generation Road, is applicable to push-button switch, and described false-touch prevention Power Generation Road comprises:
Partial pressure unit, a fixed voltage other end ground connection is accessed in one end, and described partial pressure unit is connected with the output of described push-button switch, carries out voltage division processing in order to the input signal exported described fixed voltage and described push-button switch;
Charhing unit;
Onunit, described fixed voltage other end ground connection is accessed in one end, and output and the described charhing unit of described onunit and described push-button switch are connected, in order to determine whether according to described input signal to charge to described charhing unit;
Voltage control unit, described fixed voltage other end ground connection is accessed in one end, and described voltage control unit is also connected with described charhing unit, and the magnitude of voltage in order to the output signal to described false-touch prevention Power Generation Road controls;
Process chip, is connected with described voltage control unit, in order to receive the output signal of described circuits for triggering, and judges whether to occur button false triggering according to described output signal.
Preferably, described partial pressure unit comprises the first resistance, the second resistance and the 3rd resistance of connecting successively; Described fixed voltage is accessed in one end of described first resistance, and the other end is connected with described second resistance; One end of described 3rd resistance is connected with described second resistance, other end ground connection; The output of described push-button switch is connected between described first resistance and the second resistance.
Preferably, described second resistance also with the first Capacitance parallel connection, described first electric capacity one end is connected with the output of described push-button switch, other end ground connection.
Preferably, described onunit comprises the 4th resistance and triode of series connection, and one end of described 4th resistance is connected with described fixed voltage, and the other end is connected with the collector electrode of described triode; The grounded emitter of described triode, base stage is connected electrically between described second resistance and the 3rd resistance.
Preferably, described charhing unit comprises the 3rd electric capacity, and described 3rd electric capacity one end is electrically connected on the collector electrode of described triode, other end ground connection.
Preferably, described voltage control unit comprises the 5th resistance and metal-oxide-semiconductor of series connection, and one end of described 5th resistance is connected with described fixed voltage, and the other end is connected with the drain electrode of described metal-oxide-semiconductor; The source ground of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is electrically connected with the collector electrode of described triode.
Preferably, described process chip is connected electrically between described 5th resistance and the drain electrode of described metal-oxide-semiconductor.
Preferably, also to connect between described second resistance and described 5th resistance one the 6th resistance.
Preferably, the conducting voltage of described triode is 0.7V.
Preferably, described fixed voltage is 3.3V.
Technique scheme tool has the following advantages or beneficial effect: the utility model can prevent the false triggering of button from operating from hardware, make full use of triode Q1 turn-on condition different from metal-oxide-semiconductor Q2, in addition according to different circuit board actual conditions, the value that can adjust R4 and C2 is to change delay action time, longer than the time of delay of general simple RC filter circuit also more effective.
Accompanying drawing explanation
With reference to appended accompanying drawing, to describe embodiment of the present utility model more fully.But, appended accompanying drawing only for illustration of and elaboration, do not form the restriction to the utility model scope.
Fig. 1 is the structural representation of a kind of button false-touch prevention of the utility model Power Generation Road;
Fig. 2 is the circuit diagram of a kind of button false-touch prevention of the utility model Power Generation Road;
The oscillogram of input signal when Fig. 3 is push-button switch false triggering in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of button false-touch prevention of the utility model Power Generation Road is described in detail.
As shown in Figure 1, a kind of button false-touch prevention Power Generation Road, be applicable to pushbutton unit, described pushbutton unit comprises push-button switch, described pushbutton unit one end ground connection, and when described button is pressed closed, the output of described pushbutton unit exports an input signal;
Described button false-touch prevention Power Generation Road comprises:
Partial pressure unit, a fixed voltage is accessed in described partial pressure unit one end, other end ground connection, and the output of described pushbutton unit is connected with described partial pressure unit; Described partial pressure unit is in order to carry out voltage division processing to described fixed voltage and described input signal;
Charhing unit, in order to charge;
Onunit, described fixed voltage is accessed in one end, other end ground connection, and also respectively the output of described pushbutton unit and a charhing unit are connected, in order to determine whether according to described input signal to charge to described charhing unit described onunit;
Voltage control unit, described fixed voltage is accessed in one end, other end ground connection, and described voltage control unit is also connected with described charhing unit, in order to control the output signal of described false-touch prevention Power Generation Road when described charhing unit charges;
Process chip, is connected with described voltage control unit, in order to receive the output signal of described circuits for triggering, and judges whether to occur button false triggering according to described output signal.
As shown in Figure 2, wherein, described partial pressure unit comprise connect successively resistance R1 (the first resistance), R2 (the second resistance), resistance R3 (the 3rd resistance), wherein a fixed voltage is accessed in one end of resistance R1, the other end is all connected with described button with resistance R2, and the magnitude of voltage of described fixed voltage can be 3.3V.Connect with resistance R2 in one end of resistance R3, other end ground connection.Be connected with described button between resistance R1 and resistance R2, namely access described input signal between resistance R1 and resistance R2.In addition, resistance R2 is also in parallel with an electric capacity C1 (the first electric capacity), and one end of electric capacity C1 is connected with described button, other end ground connection.
A nearly step, electric capacity C1 is filter capacitor, and its capacitance size is 0.1uF, for accessing the partial noise of signal described in elimination.The size of resistance R1, R2 and R3 is respectively 4.7k, 10k, 10k, and resistance R1, R2 and R3 carry out voltage division processing to described access signal, makes the base voltage of triode Q1 be 1.3V.
Described onunit comprises resistance R4 (the 4th resistance) and the triode Q1 of series connection, and wherein, resistance R4 one end is connected with fixed voltage, and the other end is connected with the collector electrode of triode Q1.The grounded emitter of triode Q1, base stage is connected between resistance R2 and resistance R3.Described charhing unit is electric capacity C2 (the second electric capacity), and electric capacity C2 one end is connected to the collector electrode of triode Q1, other end ground connection.Described triode Q1 can be NPN type triode, and concrete model is PMBS3904, and the conducting voltage of triode Q1 is 0.7V, and triode Q1 is conducting under non-trigger state.
Described voltage control unit comprises resistance R5 (the 5th resistance) and the metal-oxide-semiconductor Q2 of series connection, and one end of resistance R5 is connected with fixed voltage, and the other end is connected with the drain electrode of metal-oxide-semiconductor Q2.The source ground of metal-oxide-semiconductor Q2, grid is connected with the collector electrode of described triode C1.In addition, process chip is connected between the drain electrode of resistance R5 and metal-oxide-semiconductor Q2, and namely the output signal of described circuits for triggering is the voltage between the drain electrode of resistance R5 and metal-oxide-semiconductor Q2.Metal-oxide-semiconductor Q2 can be NMOS tube, and concrete model is H2N7002.Resistance R4 is the current-limiting resistance of NMOS tube Q2 grid, and resistance C2 is Q2 gate charges electric capacity, and capacitance can be 0.1uF to tens uF, plays filtering and delays the ON time effect of metal-oxide-semiconductor Q2.Due to Q1 conducting under non-trigger state, so the grid of Q2 is low level, the non-conducting of Q2, the drain electrode of Q2 is high level.Resistance R5 is the pull-up resistor of output signal, makes output signal keep high level under the non-trigger state of Q1.
In addition, also connect a resistance R6 (the 6th resistance) between resistance R2 and resistance R5.The resistance value of resistance R4, R5, R6 is respectively 100k, 4.7k, 20k.R6 is feedback resistance, when button press input signal enter described circuits for triggering time, the loop be made up of R5, R6, R2 can delay curent change.
Specifically, as shown in Figure 2, the waveform of button when false triggering also there will be burr, and the time is very short, usually within the 10ms time; Due to the effect of resistance R5, R6, R3, input signal must be down to 0.34V, the conducting state of Q1 just can be cut off, at this moment C2 is charged by R4, (suppose that the charging interval is t1 when the grid of Q2 reaches 2.5V, usually at tens about ms), Q2 just meeting conducting, output signal just can have been dragged down triggering.Certainly due in the process of false triggering, maintain shorter of input signal and make the charging interval of C2 not reach t1, Q1 will conducting again, and the gate pole tension of Q2 does not just reach 2.5V, Q2 would not conducting, and output signal will keep high level and can not trigger low level.
Button is when normal running, be different from false triggering, input signal (PRESS_IN) remains on time of below 0.34V can be long, usually at more than 1s, Q1 is cut off, t1 can reach 2.5V and conducting much smaller than the gate pole of 1s, Q2, output signal (PRESS_OUT) is by high level step-down level triggered as normal.
Because the dividing potential drop of R5, R6, R3 exists, the voltage of PRESS_IN must B pole ON-OFF voltage 0.7V lower than Q1 time, the voltage of B pole just can be dragged down, resistance between the BE knot putting aside triode Q1, when we suppose that the voltage that input signal arrives is x, the B pole tension of Q1 reaches critical point.According to Kirchhoff's current law (KCL):
(0.7-x)/R2+0.7/R3＝(3.3-0.7)/(R5+R6)
According to can be calculated: x=0.347V
Therefore, the button false-touch prevention Power Generation Road that the utility model provides, when there is false triggering in button, the waveform of false triggering there is burr and the false triggering time short, even and if now triode Q1 conducting and electric capacity C2 in certain section of event has charged, but because its charging interval is too short, Q1 just conducting again when the grid voltage of metal-oxide-semiconductor Q2 does not reach 2.5V, the value now accessing the output signal of process chip is still high level, process chip judges not carry out any process by the signal that output signal now sends for false triggering.And when button normal running, input signal remains on time of below 0.34V can be long, namely the time of Q1 cut-off can be more of a specified duration, the time that so electric capacity C2 charges also can be more of a specified duration, now the grid voltage of metal-oxide-semiconductor Q2 just can reach 2.5V and conducting, output signal just becomes low level, and now process chip judges that output signal is now as button press, then process operation accordingly.
In the utility model, utilize the different of triode Q1 and NMOS tube Q2 turn-on condition, adjustable charging time delay, prevent that NMOS tube Q2 is switched on produces false triggering; Utilize electric resistance partial pressure to limit the cut-off of triode Q1, make triggering signal lower than triode Q1 conducting voltage one half, just can make the cut-off of triode Q1.The utility model can prevent the false triggering of button from operating from hardware, make full use of triode Q1 turn-on condition different from metal-oxide-semiconductor Q2, in addition according to different circuit board actual conditions, the value that can adjust R4 and C2 is to change delay action time, longer than the time of delay of general simple RC filter circuit also more effective.
For a person skilled in the art, after reading above-mentioned explanation, various changes and modifications undoubtedly will be apparent.Therefore, appending claims should regard the whole change and correction of containing true intention of the present utility model and scope as.In Claims scope, the scope of any and all equivalences and content, all should think and still belong in intention of the present utility model and scope.
Claims (10)
1. a button false-touch prevention Power Generation Road, is applicable to push-button switch, it is characterized in that, described false-touch prevention Power Generation Road comprises:
Partial pressure unit, a fixed voltage is accessed in one end, other end ground connection, and described partial pressure unit is connected with the output of described push-button switch, carries out voltage division processing in order to the input signal exported described fixed voltage and described push-button switch;
Charhing unit;
Onunit, described fixed voltage other end ground connection is accessed in one end, and output and the described charhing unit of described onunit and described push-button switch are connected, in order to determine whether according to described input signal to charge to described charhing unit;
Voltage control unit, described fixed voltage other end ground connection is accessed in one end, and described voltage control unit is connected with described charhing unit, and the magnitude of voltage in order to the output signal to described false-touch prevention Power Generation Road controls;
Process chip, is connected with described voltage control unit, in order to receive the output signal of described circuits for triggering, and judges whether to occur button false triggering according to described output signal.
2. button false-touch prevention Power Generation Road according to claim 1, is characterized in that, described partial pressure unit comprises the first resistance, the second resistance and the 3rd resistance of connecting successively; Described fixed voltage is accessed in one end of described first resistance, and the other end is connected with described second resistance; One end of described 3rd resistance is connected with described second resistance, other end ground connection; The output of described push-button switch is connected between described first resistance and the second resistance.
3. button false-touch prevention Power Generation Road according to claim 2, is characterized in that, described second resistance also with the first Capacitance parallel connection, described first electric capacity one end is connected with the output of described push-button switch, other end ground connection.
4. button false-touch prevention Power Generation Road according to claim 2, is characterized in that, described onunit comprises the 4th resistance and triode of series connection, and one end of described 4th resistance is connected with described fixed voltage, and the other end is connected with the collector electrode of described triode; The grounded emitter of described triode, base stage is connected electrically between described second resistance and the 3rd resistance.
5. button false-touch prevention Power Generation Road according to claim 4, is characterized in that, described charhing unit comprises the 3rd electric capacity, and described 3rd electric capacity one end is electrically connected on the collector electrode of described triode, other end ground connection.
6. button false-touch prevention Power Generation Road according to claim 4, is characterized in that, described voltage control unit comprises the 5th resistance and metal-oxide-semiconductor of series connection, and one end of described 5th resistance is connected with described fixed voltage, and the other end is connected with the drain electrode of described metal-oxide-semiconductor; The source ground of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is electrically connected with the collector electrode of described triode.
7. button false-touch prevention Power Generation Road according to claim 6, is characterized in that, described process chip is connected electrically between described 5th resistance and the drain electrode of described metal-oxide-semiconductor.
8. button false-touch prevention Power Generation Road according to claim 6, is characterized in that, one the 6th resistance of also connecting between described second resistance and described 5th resistance.
9. button false-touch prevention Power Generation Road according to claim 8, is characterized in that, the conducting voltage of described triode is 0.7V.
10. button false-touch prevention Power Generation Road according to claim 9, is characterized in that, described fixed voltage is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520690294.5U CN204948048U (en) | 2015-09-07 | 2015-09-07 | A kind of button false-touch prevention Power Generation Road |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520690294.5U CN204948048U (en) | 2015-09-07 | 2015-09-07 | A kind of button false-touch prevention Power Generation Road |
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| CN204948048U true CN204948048U (en) | 2016-01-06 |
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| CN201520690294.5U Expired - Fee Related CN204948048U (en) | 2015-09-07 | 2015-09-07 | A kind of button false-touch prevention Power Generation Road |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106909109A (en) * | 2017-03-30 | 2017-06-30 | 上海龙东光电子有限公司 | Photoelectric nacelle push-button control system and its control method |
| CN109831195A (en) * | 2019-01-29 | 2019-05-31 | 维沃移动通信有限公司 | Key control circuit and mobile terminal |
-
2015
- 2015-09-07 CN CN201520690294.5U patent/CN204948048U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106909109A (en) * | 2017-03-30 | 2017-06-30 | 上海龙东光电子有限公司 | Photoelectric nacelle push-button control system and its control method |
| CN109831195A (en) * | 2019-01-29 | 2019-05-31 | 维沃移动通信有限公司 | Key control circuit and mobile terminal |
| CN109831195B (en) * | 2019-01-29 | 2023-12-12 | 维沃移动通信有限公司 | Key control circuit and mobile terminal |
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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: 20160106 Termination date: 20180907 |