CN206422761U - A kind of switching signal detects circuit - Google Patents
A kind of switching signal detects circuit Download PDFInfo
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- CN206422761U CN206422761U CN201621115479.4U CN201621115479U CN206422761U CN 206422761 U CN206422761 U CN 206422761U CN 201621115479 U CN201621115479 U CN 201621115479U CN 206422761 U CN206422761 U CN 206422761U
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Abstract
Circuit is detected the utility model discloses a kind of switching signal, it includes key switch circuit, and it also includes：Signal generating circuit for producing stable periodicity pulse signal, it is connected to key switch circuit；For detect signal condition and with two-way output interface signal processing circuit, it is connected to signal generating circuit；Reference voltage circuit for providing reference voltage, it is connected to signal generating circuit.The switching signal detection circuit that the utility model is provided can realize the conduction of two key switches by two wires, reduce circuit system wire and interface spending.
Description
Technical field
The utility model is related to technical field of electronic control, and circuit is detected more particularly, to a kind of switching signal.
Background technology
Realize that the input of circuit system control signal is very universal by key switch signal, generally for number of keys compared with
Few level signal detection button, required number of conductors is number of keys plus a public wire.For being pressed with two
For the level detection circuit of key, three wires are at least needed to realize the signal transduction of two buttons：Wherein two wire difference
Two buttons are connected, another wire is used as public high level or low level wire.
For by the external circuit system with key switch operating mechanism of plug receptacle, make every effort to reduce wire radical so as to
Reduce interface spending, while can reduce plug receptacle there is the probability of connecting fault, on the premise of keypress function is not influenceed, this
Plant the reduction that conventional level detection button is difficult to realize number of conductors.
Utility model content
The purpose of this utility model is to provide a kind of switching signal detection circuit, its by the processing of pulse signals and
Detection, the conduction of two key switch signals is realized using two wires, reduces the spending of circuit system wire and interface.
In order to solve the above technical problems, embodiment of the present utility model, which provides a kind of switching signal, detects circuit, its
Including key switch circuit, it also includes：Signal generating circuit, it is connected to key switch circuit；Signal processing circuit, it is connected to
Signal generating circuit；Reference voltage circuit, it is connected to signal generating circuit.
Compared with prior art, the switching signal detection circuit that the utility model is provided can realize two by two wires
The conduction of individual key switch, reduces circuit system wire and interface spending.
Further, two key switches of key switch circuit connect a diode and constitute two series electricals respectively
Road, the diode current flow of two key switch series connection is in opposite direction, and two series circuits are parallel with one another.
Further, signal generating circuit includes：First voltage comparator U1, its output end is connected to resistance R4, electric capacity successively
C2, resistance R5, resistance R6, resistance R7, first voltage comparator U1 reverse input end are connected to power supply VCC, the first voltage
Comparator U1 input in the same direction is terminated between resistance R1, resistance R2, and resistance R1 other ends ground connection, resistance R1 ground connection is terminated with
One end is connected to power supply VCC electric capacity C1, and the resistance R3, resistance R4, resistance R2 for being connected to power supply VCC are connected to by two diode (Xiao
Special based diode) series circuit that is reversely connected in series to form, series circuit other end ground connection, resistance R6 two ends are connected to separately respectively
Electric capacity C3, the diode D1 of one end ground connection, resistance R7, resistance R8 are connected to key switch circuit, and resistance R7 is connected to other end ground connection
Inductance L1, resistance R8 is connected to inductance L1 earth terminal, and resistance R7, resistance R8 key switch circuit access are terminated with electric capacity
C5, resistance R8 key switch access are terminated with the electric capacity C6 of other end ground connection, have between resistance R6 and resistance R7 at signal
Manage circuit interface.
Further, signal processing circuit includes：Second voltage comparator U2-A, tertiary voltage comparator U2-B, the second electricity
Pressure comparator U2-A reverse input end, tertiary voltage comparator U2-B input in the same direction is connected to signal hair by electric capacity C4
Raw circuit, second voltage comparator U2-A input in the same direction, tertiary voltage comparator U2-B reverse input end are connected to reference
Potential circuit, be connected to power supply VCC resistance R9 be connected to the other end ground connection resistance R10, be connected to power supply VCC electric capacity C7 it is another
End ground connection, is connected to one end that circuit access occurs for electric capacity C4 non-signal, second voltage comparator U2- between resistance R9, resistance R10
A output end is connected to output interface out1 by resistance R15, and tertiary voltage comparator U2-B output end passes through resistance R17
And output interface out2 is connected to, another termination 5V power supplys are connected between second voltage comparator U2-A output end and resistance R15
Resistance R14, the resistance R16 of another termination 5V power supplys is connected between tertiary voltage comparator U2-B output end and resistance R17.
Further, reference voltage circuit includes：Power supply VCC resistance R11 is connected to, resistance R11 is connected to other end ground connection
Voltage-regulator diode D4, is connected to the second voltage comparator U2-A of signal processing circuit between resistance R11, voltage-regulator diode D4, electricity
Second voltage comparator line attachment between resistance R11, voltage-regulator diode D4 is connected with resistance R12, and resistance R12 is connected to the other end
The resistance R13 of ground connection, is connected to the tertiary voltage comparator U2-B of signal processing circuit between resistance R12 and resistance R13.
Further, first voltage comparator U1, second voltage comparator U2-A, tertiary voltage comparator U2-B use voltage
Comparator LM393M.
Brief description of the drawings
Fig. 1 is that a kind of switching signal detects schematic block circuit diagram；
Fig. 2 is that a kind of switching signal detects circuit diagram.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect that the utility model is realized are easy to understand, under
In conjunction with specific embodiments, the utility model is expanded on further in face.
Embodiment of the present utility model provides a kind of switching signal and detects circuit, and shown in Figure 1, it includes button
On-off circuit 1, the signal generating circuit 2 for being connected to key switch circuit 1, the signal processing circuit 3 for being connected to signal generating circuit 2,
Signal generating circuit 3 and the reference voltage circuit 4 for providing reference voltage are connected to, the key switch circuit is realized to exchange arteries and veins
The break-make control of signal is rushed, pulse signal is changed into only to be more than zero potential or the waveform less than zero potential, and signal is sent out
Raw circuit produces stable periodicity pulse signal, and signal processing circuit detects signal condition, is exported with two-way,
In Fig. 1, interface position W is shown, key switch circuit can pass through the interface comprising two wires and circuit other parts phase
Connection.
Specifically, shown in Figure 2, two key switches S1, S2 of key switch circuit 1 connect two poles respectively
Pipe D3, D2 and constitute two series circuits, the diode current flow of two key switches series connection is in opposite direction, two series circuit phases
It is mutually in parallel.
Referring to Fig. 2, signal generating circuit 2 includes：Compared using such as voltage comparator LM393M first voltages constituted
Device U1, its output end is connected to resistance R4, electric capacity C2, resistance R5, resistance R6, resistance R7 successively, first voltage comparator U1's
Reverse input end is connected to power supply VCC, and first voltage comparator U1 input in the same direction is terminated between resistance R1, resistance R2, electricity
Hinder R1 other ends ground connection, resistance R1 ground connection is terminated with the electric capacity C1 that one end is connected to power supply VCC, be connected to power supply VCC resistance R3,
Resistance R4, resistance R2 are connected to the series circuit being made up of two diodes in reverse series, series circuit other end ground connection, resistance
R6 two ends are connected to electric capacity C3, the diode D1 of other end ground connection respectively, and resistance R7, resistance R8 are connected to key switch circuit, electricity
Resistance R7 is connected to the inductance L1 of other end ground connection, and resistance R8 is connected to inductance L1 earth terminal, resistance R7, resistance R8 key switch electricity
Road access is terminated with electric capacity C5, and resistance R8 key switch access is terminated with the electric capacity C6 of other end ground connection, resistance R6 and resistance
There is signal processing circuit interface between R7.
Referring to Fig. 2, signal processing circuit includes：The second voltage comparator constituted using such as voltage comparator LM393M
U2-A, tertiary voltage comparator U2-B, second voltage comparator U2-A reverse input end, tertiary voltage comparator U2-B it is same
Signal generating circuit is connected to by electric capacity C4 to input, second voltage comparator U2-A input in the same direction, tertiary voltage
Comparator U2-B reverse input end is connected to reference voltage circuit, and the resistance R9 for being connected to power supply VCC is connected to the electricity of other end ground connection
R10 is hindered, power supply VCC electric capacity C7 other end ground connection is connected to, the generation of electric capacity C4 non-signal is connected between resistance R9, resistance R10
One end of circuit access, second voltage comparator U2-A output end is connected to output interface out1 by resistance R15, the 3rd electricity
Pressure comparator U2-B output end is connected to output interface out2 by resistance R17, second voltage comparator U2-A output end
The resistance R14 of another termination 5V power supplys, tertiary voltage comparator U2-B output end and resistance R17 are connected between resistance R15
Between be connected to the resistance R16 of another termination 5V power supplys, signal processing circuit is by reference to voltage and on-off circuit output signal
Compare, export corresponding switching signal.
Referring to Fig. 2, reference voltage circuit includes：Power supply VCC resistance R11 is connected to, resistance R11 is connected to other end ground connection
Voltage-regulator diode D4, is connected to the second voltage comparator U2-A of signal processing circuit between resistance R11, voltage-regulator diode D4, electricity
Second voltage comparator line attachment between resistance R11, voltage-regulator diode D4 is connected with resistance R12, and resistance R12 is connected to the other end
The resistance R13 of ground connection, is connected to the tertiary voltage comparator U2-B of signal processing circuit between resistance R12 and resistance R13.
Operation principle of the present utility model is：
The first step, signal generating circuit sends stable periodicity pulse signal；
Second step, signal processing circuit obtains waveform signal, and is compared with reference voltage, in no switching signal
In the case of, the relatively stable square-wave signal of signal processing circuit output duty cycle；
3rd step, if a certain button is pressed, a side waveform of the pulse signal that signal generating circuit is produced will be by
Prune, by the comparison with reference voltage, the square-wave signal that the correspondence of signal processing circuit is exported all the way is changed into level signal.Together
Sample, if another button is pressed, another road output square-wave signal of signal processing circuit is changed into level signal.If two buttons are same
When press, the stable level signal of signal processing circuit output two-way can be handled as another signal, do not limited herein
It is fixed.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific implementation of the present utility model
Example, and in actual applications, can to it, various changes can be made in the form and details, without departing from spirit of the present utility model
And scope.
Claims (6)
1. a kind of switching signal detects circuit, it includes key switch circuit, it is characterised in that it also includes：
Signal generating circuit for producing stable periodicity pulse signal, it is connected to the key switch circuit；
For detect signal condition and with two-way output interface signal processing circuit, it is connected to the signal generating circuit；
Reference voltage circuit for providing reference voltage, it is connected to the signal generating circuit.
2. a kind of switching signal detection circuit according to claim 1, it is characterised in that the two of the key switch circuit
Individual key switch connects a diode and constitutes two series circuits respectively, the diode current flow side of two key switch series connection
To on the contrary, two series circuits are parallel with one another.
3. a kind of switching signal detection circuit according to claim 1, it is characterised in that the signal generating circuit bag
Include：First voltage comparator U1, its output end is connected to resistance R4, electric capacity C2, resistance R5, resistance R6, resistance R7, the first electricity successively
Pressure comparator U1 reverse input end is connected to power supply VCC, and first voltage comparator U1 input in the same direction is terminated at resistance R1, electricity
Hinder between R2, the resistance R1 other ends ground connection, the ground connection of the resistance R1 is terminated with the electric capacity C1 that one end is connected to power supply VCC,
The resistance R3, resistance R4, resistance R2 for being connected to power supply VCC are connected to the series circuit being made up of two diodes in reverse series, the string
Join circuit other end ground connection, the two ends of the resistance R6 are connected to electric capacity C3, the diode D1 of other end ground connection respectively, resistance R7,
Resistance R8 is connected to key switch circuit, and the resistance R7 is connected to the inductance L1 of other end ground connection, and resistance R8 is connected to connecing for inductance L1
Ground terminal, resistance R7, resistance R8 key switch circuit access are terminated with electric capacity C5, and resistance R8 key switch access is terminated with separately
The electric capacity C6 of one end ground connection, has signal processing circuit interface between the resistance R6 and resistance R7.
4. a kind of switching signal detection circuit according to claim 1, it is characterised in that the signal processing circuit bag
Include：Second voltage comparator U2-A, tertiary voltage comparator U2-B, the reverse input end of the second voltage comparator U2-A,
Tertiary voltage comparator U2-B input in the same direction is connected to signal generating circuit by electric capacity C4, second voltage comparator U2-A
Input in the same direction, tertiary voltage comparator U2-B reverse input end be connected to reference voltage circuit, be connected to power supply VCC resistance
R9 is connected to the resistance R10 of other end ground connection, power supply VCC electric capacity C7 other end ground connection is connected to, between resistance R9, resistance R10
One end that circuit access occurs for electric capacity C4 non-signal is connected to, second voltage comparator U2-A output end is connect by resistance R15
In output interface out1, tertiary voltage comparator U2-B output end is connected to output interface out2 by resistance R17, the second electricity
The resistance R14 of another termination 5V power supplys, tertiary voltage comparator are connected between pressure comparator U2-A output end and resistance R15
The resistance R16 of another termination 5V power supplys is connected between U2-B output end and resistance R17.
5. a kind of switching signal detection circuit according to claim 1, it is characterised in that the reference voltage circuit bag
Include：Power supply VCC resistance R11 is connected to, resistance R11 is connected to the voltage-regulator diode D4 of other end ground connection, resistance R11, the pole of voltage stabilizing two
The second voltage comparator U2-A of signal processing circuit is connected between pipe D4, the second electricity between resistance R11, voltage-regulator diode D4
Pressure comparator line attachment is connected with resistance R12, and resistance R12 is connected to the resistance R13, resistance R12 and resistance R13 of other end ground connection
Between be connected to the tertiary voltage comparator U2-B of signal processing circuit.
6. a kind of switching signal detection circuit according to claim 3, it is characterised in that the first voltage comparator
U1, second voltage comparator U2-A, tertiary voltage comparator U2-B use voltage comparator LM393M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621115479.4U CN206422761U (en) | 2016-10-11 | 2016-10-11 | A kind of switching signal detects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621115479.4U CN206422761U (en) | 2016-10-11 | 2016-10-11 | A kind of switching signal detects circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206422761U true CN206422761U (en) | 2017-08-18 |
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ID=59578147
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621115479.4U Active CN206422761U (en) | 2016-10-11 | 2016-10-11 | A kind of switching signal detects circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111193517A (en) * | 2020-02-24 | 2020-05-22 | 苏州贝昂科技有限公司 | Digital combined key circuit |
| CN113454475A (en) * | 2019-02-15 | 2021-09-28 | 西门子股份公司 | Method and apparatus for automatically inspecting switching device |
-
2016
- 2016-10-11 CN CN201621115479.4U patent/CN206422761U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113454475A (en) * | 2019-02-15 | 2021-09-28 | 西门子股份公司 | Method and apparatus for automatically inspecting switching device |
| CN111193517A (en) * | 2020-02-24 | 2020-05-22 | 苏州贝昂科技有限公司 | Digital combined key circuit |
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