CN206147891U - A signal collection circuit for fire alarm device - Google Patents
A signal collection circuit for fire alarm device Download PDFInfo
- Publication number
- CN206147891U CN206147891U CN201621217912.5U CN201621217912U CN206147891U CN 206147891 U CN206147891 U CN 206147891U CN 201621217912 U CN201621217912 U CN 201621217912U CN 206147891 U CN206147891 U CN 206147891U
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- comparator
- signal
- amplifier
- phase
- resistance
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Abstract
The utility model discloses a signal collection circuit for fire alarm device, it is including a signal input unit, a sampling resistor, a difference amplifying unit and a AD sampling unit, wherein: the signal input unit is used for connecting the alarm circuit of fire alarm device including first comparator, second comparator and NPN pipe, the input of signal input unit, and the high potential is connected to the homophase end of first comparator, and the output of first comparator is connected in the homophase end of second comparator, and the output end signal of second comparator transmits to the base of NPN pipe, and sampling resistor's first end is connected to the projecting pole of NPN pipe, and sampling resistor's second end passes through the capacity ground, the voltage that the difference amplifying unit is used for bearing sampling resistor carries on transmitting to AD sampling unit after the difference is enlargied, converts data signal into by AD sampling unit. The utility model discloses signal sampling is accurate, can avoid the erroneous judgement, take bearing force strong.
Description
Technical field
The utility model is related to the signal sampling of fire alarm system, transmission technique field, more particularly to a kind of for fire
The signal sample circuit of calamity warning device.
Background technology
Fire alarm installation：Refer in automatic fire alarm system, to receive, show and transmit fire alarm letter
Number, and control signal can be sent and the control instruction equipment with other miscellaneous functions is referred to as fire alarm installation.Fire alarm
Controller is exactly wherein most basic one kind.Fire alarm control unit is the core component in fire alarm system, its load
Bear and provide stable working power for fire detector；The working condition of monitoring detector and system itself；Receive, change,
Process the alarm signal of fire detector output；Carry out sound and light alarm；Indicate concrete position and the time reported to the police；Phase is performed simultaneously
The tasks such as control should be aided in.And sampled using big electric resistance partial pressure in the alarm circuit control circuit of traditional fire alarm installation,
By the resistance string of a 0.5K Ω in output loop, thus the detection voltage behind resistance carrys out the size of calculating current, so as to
Largely reducing the load capacity (if the resistance of load can produce wave distortion more than 20 Ω) in loop so that whole to report to the police
Loop control circuit runs extremely unstable.
Utility model content
The technical problems to be solved in the utility model is, for the deficiencies in the prior art, there is provided a kind of signal sampling is accurate
Really, it is avoided that the strong signal sample circuit for fire alarm installation of erroneous judgement, carrying load ability.
To solve above-mentioned technical problem, the utility model is adopted the following technical scheme that.
A kind of signal sample circuit for fire alarm installation, its include a signal input unit, a sample resistance,
One differential amplification unit and an AD sampling units, wherein：The signal input unit includes first comparator, the second comparator
Manage with NPN, the input of the signal input unit is used to connect the alarm circuit of fire alarm installation, the first comparator
In-phase end connection high potential, the signal that the input of the signal input unit is accessed is transmitted separately to the anti-of first comparator
Phase end and the output end of first comparator, the output end of the first comparator is connected to the in-phase end of the second comparator, institute
The output end signal for stating the second comparator is transmitted to the base stage of NPN pipes, and the colelctor electrode of the NPN pipes connects high potential, the NPN pipes
Emitter stage connect the first end of sample resistance, the second end of the sample resistance by capacity earth, the sample resistance the
The signal at two ends is also transmitted to the end of oppisite phase of the second comparator；The input of the differential amplification unit is connected to sample resistance
Two ends, the differential amplification unit is used to carry out transmitting after differential amplification to AD sampling units by the voltage that sample resistance is carried,
Data signal is converted to by the AD sampling units.
Preferably, the differential amplification unit includes the first amplifier, the second amplifier and the 3rd amplifier, first amplifier
In-phase end be connected to the first end of sample resistance, the end of oppisite phase of first amplifier is connected with output end, first fortune
The output signal put is transmitted to the in-phase end of the 3rd amplifier, and the in-phase end of second amplifier is connected to the second of sample resistance
End, the end of oppisite phase of second amplifier is connected with output end, and the output end signal of second amplifier is transmitted to the 3rd amplifier
End of oppisite phase, the end of oppisite phase and output end of the 3rd amplifier connected by feedback resistance, and the output end of the 3rd amplifier connects
It is connected to AD sampling units.
Preferably, the signal input unit also includes a phase inverter, and the input of the phase inverter is used to connect fire
The alarm circuit of calamity warning device, the output end of the phase inverter is connected to the anti-phase of first comparator by the first current-limiting resistance
End, between the end of oppisite phase and output end of the first comparator the second current-limiting resistance is connected with.
Preferably, connected by the 3rd current-limiting resistance between the output end of second comparator and the base stage of NPN pipes.
In the disclosed signal sample circuit for fire alarm installation of the utility model, with the electricity of alarm circuit signal
Buckling, produces therewith voltage signal on sample resistance, the voltage signal is single by AD samplings after differential amplification unit amplification
Unit is converted to data signal, so that subsequent conditioning circuit is received, responded.The utility model, as intermediary element, is entered using sample resistance
And to the signal real-time response of alarm circuit, for comparing the mode that larger resistance is sealed in alarm circuit, the utility model
Without limitation on the transmission of electric current in alarm circuit, the carrying load ability of circuit and the stability of circuit are substantially increased, meanwhile,
In the presence of signal input unit so that the voltage on sample resistance can with alarm circuit signal real-time change so that letter
Number sampling process has the preferable real-time can reliability.
Description of the drawings
Fig. 1 is the composition frame chart of the utility model signal sample circuit.
Fig. 2 is the schematic diagram of the utility model signal sample circuit.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and examples.
The utility model discloses a kind of signal sample circuit for fire alarm installation, with reference to shown in Fig. 1 and Fig. 2,
It includes a signal input unit 1, a sample resistance R0, a differential amplification unit 2 and an AD sampling units 3, wherein：
The signal input unit 1 includes first comparator U1, the second comparator U2 and NPN pipe Q1, and the signal is defeated
Entering the input of unit 1 is used to connect the alarm circuit of fire alarm installation, and the in-phase end connection of first comparator U1 is high
Current potential, the signal that the input of the signal input unit 1 is accessed is transmitted separately to the end of oppisite phase of first comparator U1 and the
The output end of one comparator U1, the output end of first comparator U1 is connected to the in-phase end of the second comparator U2, and described
The output end signal of two comparator U2 is transmitted to the base stage of NPN pipe Q1, and the colelctor electrode of the NPN pipes Q1 meets high potential, the NPN
The emitter stage of pipe Q1 connects the first end of sample resistance R0, and second end of the sample resistance R0 is grounded by electric capacity C2, described
The signal at the ends of sample resistance R0 second is also transmitted to the end of oppisite phase of the second comparator U2；
The input of the differential amplification unit 2 is connected to the two ends of sample resistance R0, and the differential amplification unit 2 is used for
The voltage that sample resistance R0 is carried is carried out transmitting after differential amplification to AD sampling units 3, is turned by the AD sampling units 3
It is changed to data signal.
The operation principle of foregoing circuit is that electricity is initial on circuit, and first comparator U1 is defeated for high potential because of its in-phase end
Go out high level signal, the second comparator U2 exports therewith high level signal so that NPN pipes Q1 is turned on, electric capacity C2 is started to charge up, and
And the voltage of electric capacity C2 is transmitted to the end of oppisite phase of the second comparator U2,
When the in-phase end of the alarm circuit signal transmission to the second comparator U2 of fire alarm installation, if the second comparator
The homophase terminal voltage of U2 is higher than end of oppisite phase, then the second comparator U2 outputs high level so that NPN pipes Q1 is turned on, and electric capacity C2 starts
Charge, should during sample resistance R0 carry certain voltage, meanwhile, the voltage of electric capacity C2 transmits anti-to the second comparator U2
Xiang Duan, if the homophase terminal voltage of the second comparator U2 be less than end of oppisite phase, the second comparator U2 output low level, NPN pipes Q1 with
Disconnection, no-voltage on sample resistance R0, the voltage of electric capacity C2 starts to release.Additionally, in the presence of first comparator U1, when
When alarm circuit signal voltage is excessive, first comparator U1 output low level, the second comparator U2 and NPN pipe Q1 is all closed, from
And preferably play a protective role.
In said process, with the voltage change of alarm circuit signal, voltage signal is produced on sample resistance R0 therewith, should
Voltage signal through differential amplification unit 2 amplification after, data signal is converted to by AD sampling units 3, for subsequent conditioning circuit receive,
Response.The utility model, as intermediary element, and then to the signal real-time response of alarm circuit, is compared using sample resistance R0
For the mode of larger resistance is sealed in alarm circuit, the utility model without limitation on electric current in alarm circuit transmission, significantly
The carrying load ability of circuit and the stability of circuit are improve, meanwhile, in the presence of signal input unit 1 so that sampling electricity
Resistance R0 on voltage can with alarm circuit signal real-time change so that signal sampling process has preferable real-time cocoa
By property.
Used as a kind of preferred embodiment, the differential amplification unit 2 includes the first amplifier U3, the second amplifier U4 and the 3rd fortune
Put U5, the in-phase end of first amplifier U3 is connected to the first end of sample resistance R0, the end of oppisite phase of first amplifier U3 and
Output end is connected, and the output signal of first amplifier U3 is transmitted to the in-phase end of the 3rd amplifier U5, second amplifier U4
In-phase end be connected to second end of sample resistance R0, the end of oppisite phase of second amplifier U4 is connected with output end, described
The output end signal of two amplifiers U4 is transmitted to the end of oppisite phase of the 3rd amplifier U5, and the end of oppisite phase and output end of the 3rd amplifier U5 lead to
Feedback resistance R11 connections are crossed, the output end of the 3rd amplifier U5 is connected to AD sampling units 3.
Further, in order to play signal isolation effect, the signal input unit 1 also includes a phase inverter U9D, institute
Stating the input of phase inverter U9D is used to connecting the alarm circuit of fire alarm installation, and the output end of the phase inverter U9D is by the
One current-limiting resistance R1 is connected to the end of oppisite phase of first comparator U1, connects between the end of oppisite phase and output end of first comparator U1
It is connected to the second current-limiting resistance R2.Additionally, raised voltage signal and drop-out voltage signal can also be converted to square by phase inverter U9D
Shape ripple signal output so that subsequent conditioning circuit can be responded accurately.
Further, the 3rd current-limiting resistance is passed through between the base stage of the output end of the second comparator U2 and NPN pipe Q1
R3 connects.
The above is the utility model preferred embodiment, is not limited to the utility model, all in this practicality
Modification, equivalent or improvement made in new technical scope etc., should be included in the model that the utility model is protected
In enclosing.
Claims (4)
1. a kind of signal sample circuit for fire alarm installation, it is characterised in that include a signal input unit, take
Sample resistance, a differential amplification unit and an AD sampling units, wherein：
The signal input unit includes first comparator, the second comparator and NPN pipe, the input of the signal input unit
The alarm circuit for connecting fire alarm installation is held, the in-phase end connection high potential of the first comparator, the signal is defeated
The signal for entering the input access of unit is transmitted separately to the end of oppisite phase of first comparator and the output end of first comparator, institute
The output end for stating first comparator is connected to the in-phase end of the second comparator, the output end signal of second comparator transmit to
The base stage of NPN pipes, the colelctor electrode of the NPN pipes connects high potential, and the emitter stage of the NPN pipes connects the first end of sample resistance,
Also transmitted to the second comparator by capacity earth, the signal at the end of the sample resistance second at second end of the sample resistance
End of oppisite phase；
The input of the differential amplification unit is connected to the two ends of sample resistance, and the differential amplification unit is used for will sampling electricity
The voltage that resistance is carried carries out transmitting after differential amplification to AD sampling units, and by the AD sampling units digital letter is converted to
Number.
2. the signal sample circuit of fire alarm installation is used for as claimed in claim 1, it is characterised in that the differential amplification
Unit includes the first amplifier, the second amplifier and the 3rd amplifier, and the in-phase end of first amplifier is connected to the of sample resistance
One end, the end of oppisite phase of first amplifier is connected with output end, and the output signal of first amplifier is transmitted to the 3rd amplifier
In-phase end, the in-phase end of second amplifier is connected to the second end of sample resistance, the end of oppisite phase of second amplifier and defeated
Go out end to be connected, the output end signal of second amplifier is transmitted to the end of oppisite phase of the 3rd amplifier, the 3rd amplifier it is anti-phase
End and output end are connected by feedback resistance, and the output end of the 3rd amplifier is connected to AD sampling units.
3. the signal sample circuit of fire alarm installation is used for as claimed in claim 1, it is characterised in that the signal input
Unit also includes a phase inverter, and the input of the phase inverter is used to connect the alarm circuit of fire alarm installation, described anti-
The output end of phase device is connected to the end of oppisite phase of first comparator by the first current-limiting resistance, the end of oppisite phase of the first comparator and
The second current-limiting resistance is connected between output end.
4. the signal sample circuit of fire alarm installation is used for as claimed in claim 1, it is characterised in that described second compares
Connected by the 3rd current-limiting resistance between the output end of device and the base stage of NPN pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621217912.5U CN206147891U (en) | 2016-11-12 | 2016-11-12 | A signal collection circuit for fire alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621217912.5U CN206147891U (en) | 2016-11-12 | 2016-11-12 | A signal collection circuit for fire alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206147891U true CN206147891U (en) | 2017-05-03 |
Family
ID=58626760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621217912.5U Active CN206147891U (en) | 2016-11-12 | 2016-11-12 | A signal collection circuit for fire alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206147891U (en) |
-
2016
- 2016-11-12 CN CN201621217912.5U patent/CN206147891U/en active Active
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