CN206117634U - Sign indicating number circuit is received to low distortion anti -jamming - Google Patents
Sign indicating number circuit is received to low distortion anti -jamming Download PDFInfo
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- CN206117634U CN206117634U CN201621001611.9U CN201621001611U CN206117634U CN 206117634 U CN206117634 U CN 206117634U CN 201621001611 U CN201621001611 U CN 201621001611U CN 206117634 U CN206117634 U CN 206117634U
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- code
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- electric capacity
- emitter follower
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Abstract
The utility model relates to a sign indicating number field is received to the code device, specifically is a sign indicating number circuit is received to low distortion anti -jamming, and its interference killing feature is strong, the error code phenomenon can not appear, and it includes the code fetch circuit, the input input pulse code signal of code fetch circuit, emitter follower is connected through accelerateing the network module to the output of code fetch circuit, the output of code fetch circuit still produces circuit connection through the negative pressure emitter follower, emitter follower's output output code signal is decoded for CPU.
Description
Technical field
This utility model is related to code devices and receives code field, and specially a kind of low distortion is jamproof to receive code circuit.
Background technology
Receive the key interface circuit that code circuit is that code devices receive code signal, its bus device in fire protection alarm system
As being widely adopted in detector, module, when the high and low level of pulse code signal is received, receiving code circuit can sample
And output code signal, decode so that CPU is received.In actual use low level is vulnerable to interference inductively, makes low level
Trailing edge can be raised by floating, the code signal particularly after all wave rectification, and because being difficult to absorb to external disturbance, this problem is particularly
Seriously, because CPU or receiving circuit have threshold requirement to high and low level detection, general only adds audion by resistance or resistance
The receipts code circuit of composition, capacity of resisting disturbance is weak, and code signal output will produce error code sometimes.
The content of the invention
In order to solve the above problems, this utility model provides a kind of jamproof receipts code circuit of low distortion, and its is anti-interference
Ability is strong, is not in error code phenomenon.
Its technical scheme is such：A kind of low distortion is jamproof to receive code circuit, it is characterised in that it includes code fetch electricity
Road, the input input pulse encoded signal of the code fetch circuit, the outfan of the code fetch circuit is by accelerating mixed-media network modules mixed-media
Connection emitter follower, the outfan of the code fetch circuit also connects the emitter follower by negative voltage generating circuit, described
The outfan output code signal of emitter follower is decoded to CPU.
It is further characterized by, and the code fetch circuit includes resistance R1 and resistance R2, and the acceleration mixed-media network modules mixed-media includes
Electric capacity C1, the negative voltage generating circuit includes C2, and the emitter follower includes audion T1, and described resistance R1 one end is input into arteries and veins
Encoded signal is rushed, the resistance R1 other ends connect described resistance R2 one end, resistance R3 one end, electric capacity C1 one end, electric capacity C2 mono-
End, the electric capacity C1 other ends are connected the base stage of rear connecting triode T1 with the resistance R3 other ends, the audion T1's
Colelctor electrode connects power supply VCC, and the emitter stage of the audion T1 is connected and exports with the electric capacity C2 other ends, resistance R4 one end
Code signal is decoded to CPU.
After circuit of the present utility model, accelerate mixed-media network modules mixed-media to accelerate the conducting of emitter follower, produced by negative pressure
Circuit is offset low level and is elevated pieces of level, strengthens capacity of resisting disturbance.
Description of the drawings
Fig. 1 is this utility model theory diagram；
Fig. 2 is this utility model circuit theory diagrams.
Specific embodiment
See Fig. 1, shown in Fig. 2, a kind of low distortion is jamproof to receive code circuit, it includes code fetch circuit, code fetch circuit it is defeated
Enter to hold input pulse encoded signal, the outfan of code fetch circuit to connect emitter follower, code fetch circuit by accelerating mixed-media network modules mixed-media
Outfan also emitter follower is connected by negative voltage generating circuit, the outfan output code signal of emitter follower gives CPU solutions
Code.
Physical circuit is as described below：Code fetch circuit includes resistance R1 and resistance R2, accelerates mixed-media network modules mixed-media to include electric capacity C1, bears
Pressure produces circuit includes C2, and emitter follower includes audion T1, and resistance R1 one end input pulse encoded signal, resistance R1 is another
End connection resistance R2 one end, resistance R3 one end, electric capacity C1 one end, electric capacity C2 one end, the electric capacity C1 other ends and the resistance R3 other ends
The base stage of connecting triode T1 after being connected, the colelctor electrode connection power supply VCC of audion T1, emitter stage and the electric capacity C2 of audion T1
The other end, the connection of resistance R4 one end and output code signal are decoded to CPU.
Principle is as described below：Pulse code signal is obtained by resistance R1, the resistance R2 in code fetch circuit on resistance R2
To voltage division signal, send into and accelerate mixed-media network modules mixed-media electric capacity C1, the parallel network of resistance R2, drive emitter follower audion T1,
The outfan connection negative voltage generating circuit of emitter follower and generated code signal output, send into CPU decodings.Electric capacity C2 effect be
Produce weak negative pressure on resistance R4 to strengthen capacity of resisting disturbance.Electric capacity C1 effects are to accelerate audion T1 conductings, to improve rising edge.
Circuit of the present invention has the characteristics that：
1. strengthen to low level capacity of resisting disturbance：In use receipts code circuit easily receives interference inductively, makes low
Level is raised by mistake.Circuit produces weak negative pressure using electric capacity C2 electric capacity, and to offset level is elevated pieces of, and makes low level
Normally, Va is charged to electric capacity C2 by resistance R1, resistance R4 when coded pulse has rising edge to arrive.When pulse falling edge is arrived
When coming, audion T1 cut-offs, at this moment the voltage on electric capacity C2 can be in code signal output part generation negative pressure（Va-Vb), by resistance
R2, resistance R4 discharge, and the low level raised is withdrawn into normal low level value.The persistent period of negative pressure can pass through the appearance of electric capacity C2
Measure to select, but the pulsewidth of encoded signal should be taken into account
2. the distortion for reducing high level time delay of rising edge is reduced：When rising edge arrives, by acceleration network
Electric capacity C1 can make rapidly audion T1 turn on, reduce audion T1 turn on when delay effect, three after trailing edge arrives
Pole pipe T1 is ended, and electric capacity C1 is discharged by resistance R3, is that rising edge acceleration next time is ready.Acceleration time can pass through electric capacity
The capacity of C1 is selecting.But the pulsewidth of encoded signal should be taken into account
3. low-power consumption, due to having added electric capacity C1, electric capacity C2 in circuit, make use of capacitor transient stage characteristic, and using penetrating
Transmitting signal and energy, the resistance value in such circuit can be considerably increased pole follower, and operating current is just greatly dropped
It is low, it is particularly evident when without code steady-state supply.
Claims (2)
1. a kind of low distortion is jamproof receives code circuit, it is characterised in that it includes code fetch circuit, the input of the code fetch circuit
End input pulse encoded signal, the outfan of the code fetch circuit connects emitter follower by accelerating mixed-media network modules mixed-media, described to take
The outfan of code circuit also connects the emitter follower, the outfan output of the emitter follower by negative voltage generating circuit
Code signal is decoded to CPU.
2. a kind of low distortion according to claim 1 is jamproof receives code circuit, it is characterised in that the code fetch circuit bag
Include resistance R1 and resistance R2, the acceleration mixed-media network modules mixed-media includes electric capacity C1, the negative voltage generating circuit includes C2, the emitter-base bandgap grading with
Include audion T1 with device, resistance R1 one end input pulse encoded signal, the resistance R1 other ends connect the resistance
R2 one end, resistance R3 one end, electric capacity C1 one end, electric capacity C2 one end, the electric capacity C1 other ends and the resistance R3 other end phases
The base stage of connecting triode T1 after even, the colelctor electrode connection power supply VCC of the audion T1, the emitter stage of the audion T1 with
The electric capacity C2 other ends, the connection of resistance R4 one end and output code signal are decoded to CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621001611.9U CN206117634U (en) | 2016-08-31 | 2016-08-31 | Sign indicating number circuit is received to low distortion anti -jamming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621001611.9U CN206117634U (en) | 2016-08-31 | 2016-08-31 | Sign indicating number circuit is received to low distortion anti -jamming |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206117634U true CN206117634U (en) | 2017-04-19 |
Family
ID=58515755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621001611.9U Active CN206117634U (en) | 2016-08-31 | 2016-08-31 | Sign indicating number circuit is received to low distortion anti -jamming |
Country Status (1)
| Country | Link |
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| CN (1) | CN206117634U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452420A (en) * | 2016-08-31 | 2017-02-22 | 无锡蓝天电子股份有限公司 | Low-distortion and anti-interference code receiving circuit |
-
2016
- 2016-08-31 CN CN201621001611.9U patent/CN206117634U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452420A (en) * | 2016-08-31 | 2017-02-22 | 无锡蓝天电子股份有限公司 | Low-distortion and anti-interference code receiving circuit |
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