CN201774635U - Circuit for eliminating jitter of key switch and device thereof - Google Patents
Circuit for eliminating jitter of key switch and device thereof Download PDFInfo
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- CN201774635U CN201774635U CN2010201043529U CN201020104352U CN201774635U CN 201774635 U CN201774635 U CN 201774635U CN 2010201043529 U CN2010201043529 U CN 2010201043529U CN 201020104352 U CN201020104352 U CN 201020104352U CN 201774635 U CN201774635 U CN 201774635U
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Abstract
A circuit for eliminating jitter of a key switch can output digital signals to a microprocessor of a set top box and comprises a switch SW1, a first output circuit and a second output circuit. The switch SW1 comprises a control terminal, an output point A and an output point B, wherein the control end is grounded. The first output circuit is connected to the output point A and outputs digital signals to the set top box from an output end OUT. The second output circuit is connected to an output point B and outputs digital signals to the set top box from an output end OUT#. The utility model further provides a device for eliminating jitter of a key switch. The circuit for eliminating jitter of a key switch and the device thereof utilize disconnection characteristic of a transistor, can filter and convert analog signals generated during connection and disconnection of the key switch on a panel of the set top box, and then eliminate jitter of the key switch.
Description
[technical field]
The utility model relates to a kind of filter circuit, relates in particular to a kind of circuit and device thereof of eliminating the key switch shake.
[background technology]
At present, preventing that the set-top box panel key switch from " opening " voltage dithering in " closing " process, all is to adopt resistance-capacitance circuit to carry out filtering.As shown in Figure 3, resistance R 1 and capacitor C 1 are series between power supply and the ground, and output is connected in the common port of resistance R 1, capacitor C 1 and switch.Because capacitance-resistance filter is all at special frequency band, but it is very low that key switch " closes " the voltage dithering frequency that causes in the process " opening ", even be low to moderate tens hertz, therefore use the rc filter circuit filtration result often undesirable, for the MCU of sensitivity, still may cause the controller erroneous judgement.
[utility model content]
The technical problems to be solved in the utility model provides a kind of circuit and device thereof of eliminating the key switch shake, utilizes transistorized switch isolation characteristic, eliminates the shake that produces in connection of set-top box face key switch and the disconnection process.
The utility model provides a kind of circuit of eliminating the key switch shake, is connected between power supply and the set-top box, and the output digital signal is to the microprocessor of set-top box, and comprising: switch SW 1 comprises control end, output point A and output point B, wherein control end ground connection; First output circuit is connected in output point A, comprises output OUT, transistor U1, transistor U2, transistor U3 and multimitter pmultiple emitter transistor U4, exports digital signal to set-top box from output OUT; Second output circuit is connected in output point B, comprises output OUT#, transistor U5, transistor U6, transistor U7 and multimitter pmultiple emitter transistor U8, exports digital signal to set-top box from output OUT#.
As further improvement of the utility model, first output circuit also comprises diode D1, and its positive pole is connected to the emitter of transistor U2 and the common port of output OUT, and its negative pole is connected to the collector electrode of transistor U3.
As further improvement of the utility model, first output circuit also comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4 and resistance R 9, wherein resistance R 9 is connected between the output point A and power supply of switch SW 1, resistance R 4 is connected between the base stage of power supply and multimitter pmultiple emitter transistor U4, resistance R 1 is connected between the collector electrode of power supply and transistor U1, resistance R 2 is connected between the collector electrode of power supply and transistor U2, and resistance R 3 is connected between the emitter and ground of transistor U1.
As further improvement of the utility model, second output circuit also comprises diode D2, and its positive pole is connected to the emitter of transistor U7 and the common port of output OUT#, and its negative pole is connected to the collector electrode of transistor U6.
As further improvement of the utility model, first output circuit also comprises resistance R 5, resistance R 6, resistance R 7, resistance R 8 and resistance R 10, wherein resistance R 10 is connected between the output point B and power supply of switch SW 1, resistance R 8 is connected between the base stage of power supply and multimitter pmultiple emitter transistor U8, resistance R 5 is connected between the collector electrode of power supply and transistor U5, resistance R 6 is connected between the collector electrode of power supply and transistor U7, and resistance R 7 is connected between the emitter and ground of transistor U5.
The utility model also provides a kind of device of eliminating the key switch shake, comprises the circuit of this elimination key switch shake.
The circuit and the device thereof of elimination key switch shake provided by the utility model utilize transistorized switch isolation characteristic, and the analog signal that produces in connection of set-top box panel key switch and the disconnection process is carried out the filtering conversion, have eliminated the key switch shake.
[description of drawings]
Fig. 1 is the circuit diagram that the utility model is eliminated the circuit of key switch shake;
Fig. 2 is the oscillogram that the utility model is eliminated the circuit of key switch shake;
Fig. 3 is the circuit diagram of key switch filtering in the utility model background technology.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and execution mode of the present utility model.
Be the circuit diagram that the utility model is eliminated the circuit of key switch shake as shown in Figure 1.The circuit that this eliminates the key switch shake is connected between power supply and the set-top box, and the output digital signal comprises switch SW 1, first output circuit 10 and second output circuit 20 to the microprocessor of set-top box.Wherein, switch SW 1 comprises control end, output point A and output point B, control end ground connection.First output circuit 10 is connected in output point A, comprises output OUT, transistor U1, transistor U2, transistor U3 and multimitter pmultiple emitter transistor U4, exports digital signal to set-top box from output OUT.Second output circuit 20 is connected in output point B, comprises output OUT#, transistor U5, transistor U6, transistor U7 and multimitter pmultiple emitter transistor U8, exports digital signal to set-top box from output OUT#.
In the present embodiment, first emitter of multimitter pmultiple emitter transistor U4 is connected to the output point A of switch SW 1, and second emitter is connected to output OUT#, and base stage is connected to power supply, and collector electrode is connected to the base stage of transistor U1.First emitter of multimitter pmultiple emitter transistor U8 is connected to the output point B of switch SW 1, and second emitter is connected to output OUT, and base stage is connected to power supply, and collector electrode is connected to the base stage of transistor U5.The collector electrode of transistor U1 is connected to the base stage of transistor U2, and emitter is connected to the base stage of transistor U3.The collector electrode of transistor U5 is connected to the base stage of transistor U6, and emitter is connected to the base stage of transistor U7.
In the present embodiment, first output circuit 10 also comprises diode D1, resistance R 1, resistance R 2, resistance R 3, resistance R 4 and resistance R 9.The positive pole of this diode D1 is connected to the emitter of transistor U2 and the common port of output OUT, and its negative pole is connected to the collector electrode of transistor U3.Resistance R 9 is connected between the output point A and power supply of switch SW 1.Resistance R 4 is connected between the base stage of power supply and multimitter pmultiple emitter transistor U4.Resistance R 1 is connected between the collector electrode of power supply and transistor U1.Resistance R 2 is connected between the collector electrode of power supply and transistor U2, and resistance R 3 is connected between the emitter and ground of transistor U1.
In the present embodiment, second output circuit 20 also comprises diode D2, resistance R 5, resistance R 6, resistance R 7, resistance R 8 and resistance R 10, the positive pole of this diode D2 is connected to the emitter of transistor U7 and the common port of output OUT#, and its negative pole is connected to the collector electrode of transistor U6.Resistance R 10 is connected between the output point B and power supply of switch SW 1.Resistance R 8 is connected between the base stage of power supply and multimitter pmultiple emitter transistor U8.Resistance R 5 is connected between the collector electrode of power supply and transistor U5.Resistance R 6 is connected between the collector electrode of power supply and transistor U7.Resistance R 7 is connected between the emitter and ground of transistor U5.
In the present embodiment, when having a signal in the input of the emitter of multimitter pmultiple emitter transistor U4 at least when low, then multimitter pmultiple emitter transistor U4 conducting, transistor U1 turn-offs, and transistor U2 conducting is output as high level.When the emitter input signal of multimitter pmultiple emitter transistor U4 is when high, then transistor U4 turn-offs, transistor U1 conducting, and this moment, transistor U2 turn-offed, and was output as low level, and this circuit can be realized the function of a NAND gate.Transistor U5, transistor U6, the circuit that transistor U7 and transistor U8 form can be realized the function of a NAND gate equally, and is as shown in table 1 below:
The utility model also provides a kind of device of eliminating the key switch shake, comprises the circuit of this elimination key switch shake.Employed power supply can be 5V or 3.3V in the circuit of elimination switch from fluttering provided by the utility model and the device thereof.
Be the oscillogram that the utility model is eliminated the circuit of key switch shake as shown in Figure 2.Original and the output point B connection of switch, output point A links to each other with+5V, it is low that one road signal is arranged in the input of multimitter pmultiple emitter transistor U8, and then OUT is output as low level, and OUT# is output as high level, when switch is dialled to output point A by output point B, one section of short duration hang time is wherein arranged, and at this moment output point A and output point B all link to each other with+5V, all are in high level state, output OUT is a low level, and OUT# is that high level keeps original state constant.When switch contact contacts with output point A, in the ordinary course of things, the current potential of output point A is owing to vibration produces " burr " (i.e. output produces the spike sequence), but herein since output point B link to each other with+5V, keep high level, output point A is with after switch contacts, the output state of output OUT promptly transfers high level to, output OUT# transfers low level to, even after this owing to vibration causes output point A high level to occur, because output point A and output point B are when being high level simultaneously, output remains unchanged, therefore OUT still is a high level, and OUT# is a low level still, thereby has eliminated the output pulse that switch from fluttering causes.
In like manner, original and A point when switch is dialled to output point B by output point A, can be eliminated the output pulse that switch from fluttering causes equally at switch.
The circuit and the device thereof of elimination key switch shake provided by the utility model, utilize transistorized switch isolation characteristic, the analog signal that produces in connection of set-top box panel key switch and the disconnection process is carried out the filtering conversion, eliminate the key switch shake, solved the problem that rc filter circuit in the prior art shown in Figure 3 can not be eliminated the low frequency voltage dithering that key switch causes.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (2)
1. a circuit of eliminating the key switch shake is connected between power supply and the set-top box, and the output digital signal is characterized in that to the microprocessor of set-top box, comprising:
Switch SW 1 comprises control end, output point A and output point B, wherein control end ground connection;
First output circuit is connected in described output point A, comprises output OUT, transistor U1, transistor U2, transistor U3 and multimitter pmultiple emitter transistor U4, exports digital signal to described set-top box from described output OUT; First emitter of described multimitter pmultiple emitter transistor U4 is connected to the output point A of described switch SW 1, and second emitter is connected to described output OUT#, and base stage is connected to power supply, and collector electrode is connected to the base stage of described transistor U1; The collector electrode of described transistor U1 is connected to the base stage of described transistor U2, and emitter is connected to the base stage of described transistor U3; Described first output circuit also comprises diode D1, and its positive pole is connected to the emitter of transistor U2 and the common port of output OUT, and its negative pole is connected to the collector electrode of transistor U3; Described first output circuit also comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4 and resistance R 9, wherein resistance R 9 is connected between the output point A and described power supply of described switch SW 1, resistance R 4 is connected between the base stage of described power supply and described multimitter pmultiple emitter transistor U4, resistance R 1 is connected between the collector electrode of described power supply and described transistor U1, resistance R 2 is connected between the collector electrode of described power supply and described transistor U2, and resistance R 3 is connected between the emitter and ground of described transistor U1;
Second output circuit is connected in described output point B, comprises output OUT#, transistor U5, transistor U6, transistor U7 and multimitter pmultiple emitter transistor U8, exports digital signal to described set-top box from described output OUT#; First emitter of described multimitter pmultiple emitter transistor U8 is connected to the output point B of described switch SW 1, and second emitter is connected to described output OUT, and base stage is connected to power supply, and collector electrode is connected to the base stage of described transistor U5; The collector electrode of described transistor U5 is connected to the base stage of described transistor U6, and emitter is connected to the base stage of described transistor U7; Described second output circuit also comprises diode D2, and its positive pole is connected to the emitter of transistor U7 and the common port of output OUT#, and its negative pole is connected to the collector electrode of transistor U6; Described second output circuit also comprises resistance R 5, resistance R 6, resistance R 7, resistance R 8 and resistance R 10, wherein resistance R 10 is connected between the output point B and described power supply of described switch SW 1, resistance R 8 is connected between the base stage of described power supply and described multimitter pmultiple emitter transistor U8, resistance R 5 is connected between the collector electrode of described power supply and described transistor U5, resistance R 6 is connected between the collector electrode of described power supply and described transistor U7, and resistance R 7 is connected between the emitter and ground of described transistor U5.
2. a device of eliminating the key switch shake is characterized in that: the circuit that comprises the described elimination key switch shake of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201043529U CN201774635U (en) | 2010-01-26 | 2010-01-26 | Circuit for eliminating jitter of key switch and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201043529U CN201774635U (en) | 2010-01-26 | 2010-01-26 | Circuit for eliminating jitter of key switch and device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN201774635U true CN201774635U (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201043529U Expired - Fee Related CN201774635U (en) | 2010-01-26 | 2010-01-26 | Circuit for eliminating jitter of key switch and device thereof |
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|---|---|
| CN (1) | CN201774635U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540940A (en) * | 2011-12-23 | 2012-07-04 | 四川泛华电器有限责任公司 | Switch dither eliminating system and switch dither eliminating method |
| CN106773974A (en) * | 2016-12-27 | 2017-05-31 | 河南理工大学 | A kind of processing method for shaking switching signal |
| CN109639263A (en) * | 2019-02-01 | 2019-04-16 | 南宁学院 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
-
2010
- 2010-01-26 CN CN2010201043529U patent/CN201774635U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540940A (en) * | 2011-12-23 | 2012-07-04 | 四川泛华电器有限责任公司 | Switch dither eliminating system and switch dither eliminating method |
| CN102540940B (en) * | 2011-12-23 | 2013-12-04 | 四川泛华电器有限责任公司 | Switch dither eliminating system and switch dither eliminating method |
| CN106773974A (en) * | 2016-12-27 | 2017-05-31 | 河南理工大学 | A kind of processing method for shaking switching signal |
| CN109639263A (en) * | 2019-02-01 | 2019-04-16 | 南宁学院 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
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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 |
Granted publication date: 20110323 Termination date: 20150126 |
|
| EXPY | Termination of patent right or utility model |