CN209462351U - A kind of campus access control system - Google Patents
A kind of campus access control system Download PDFInfo
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- CN209462351U CN209462351U CN201920422662.6U CN201920422662U CN209462351U CN 209462351 U CN209462351 U CN 209462351U CN 201920422662 U CN201920422662 U CN 201920422662U CN 209462351 U CN209462351 U CN 209462351U
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Abstract
The utility model discloses a kind of campus access control systems, including frequency collection circuit, separate difference channel and frequency-selecting output circuit, the analog signal of frequency collection circuit acquisition campus signal transmission passage input terminal in access control system controlling terminal, it separates difference channel and uses variable resistance RW1, variable resistance RW2 and capacitor C3, frequency collection circuit output signal is divided into two paths of signals by capacitor C4, transport and placing device AR2, transport and placing device AR3 and transport and placing device AR1 composition differential amplifier circuit is to signal differential processing, last frequency-selecting output circuit, which with resistance R11- resistance R13 and capacitor C5- capacitor C7 forms frequency selection circuit and filters out single-frequency signals, to be sent to through signal projector E1 in the alarm module of campus access control system remote control terminal, it can real-time detection campus access control system controlling terminal The analog signal situation of middle signal transmission passage, while signal frequency being converted to the trigger signal of alarm module in the access control system of campus.
Description
Technical field
The utility model relates to field of circuit technology, more particularly to a kind of campus access control system.
Background technique
Access control system with loss prevention, crime prevention as the main purpose, it is therefore necessary to have high reliability, gate inhibition system
System is fused together with information management system and the office automation system, is preferably management service, is raised the management level and imitate
Rate, a kind of intelligence community access control system of the prior art (application number: CN201810693338.8) are exactly to be improved using control unit
Management level and efficiency, but the problem of consider signal disorder, however campus access control system itself sometimes can also go out
The problem of existing failure, especially signal disorder, campus access control system signal is caused error occur, need be with gate inhibition to campus
The analog signal real-time detection of signal transmission passage input terminal in controlling terminal of uniting.
Utility model content
For above situation, for the defect for overcoming the prior art, the utility model is designed to provide a kind of campus use
Access control system, can in the access control system controlling terminal of real-time detection campus signal transmission passage analog signal situation, simultaneously
Signal frequency is converted to the trigger signal of alarm module in the access control system of campus.
Its solve technical solution be: a kind of campus access control system, including frequency collection circuit, separation difference channel and
Frequency-selecting output circuit, the frequency collection circuit acquire campus signal transmission passage input terminal in access control system controlling terminal
Analog signal, which is the channel that campus access control system controlling terminal receives signal analog signal, described
Difference channel is separated with variable resistance RW1, variable resistance RW2 and capacitor C3, capacitor C4 by frequency collection circuit output signal
It is divided into two paths of signals, two paths of signals inputs transport and placing device AR2, transport and placing device AR3 non-inverting input terminal, transport and placing device AR2, transport and placing device respectively
To signal differential processing, the resistance value by adjusting variable resistance RW3 can be adjusted AR3 and transport and placing device AR1 composition differential amplifier circuit
The output signal potential value of difference channel is saved, last frequency-selecting output circuit uses resistance R11- resistance R13 and capacitor C5- capacitor C7
The signal that composition frequency selection circuit filters out single-frequency is sent to campus through signal projector E1 and remotely controls end with access control system
In the alarm module at end；
The separation difference channel includes variable resistance RW1, and the one of the 2 connecting resistance R3 of contact of variable resistance RW1, capacitor C4
End, the contact 1 of variable resistance RW1 connects the other end of capacitor C4 and one end of capacitor C3, resistance R5, the contact 3 of variable resistance RW1
Connect the other end of capacitor C3 and the non-inverting input terminal of transport and placing device AR2, one end of another terminating resistor R4 of resistance R3, resistance R4's
The contact 2 of another termination variable resistance RW2, the other end of the 1 connecting resistance R5 of contact of variable resistance RW2, the touching of variable resistance RW2
Point 3 meets the non-inverting input terminal of transport and placing device AR3, the contact 1 of the anti-phase input termination variable resistance RW3 of transport and placing device AR3 and resistance R7
One end, transport and placing device AR3 output terminating resistor R7 the other end and resistance R8 one end, another termination transport and placing device of resistance R8
The non-inverting input terminal of AR1 and one end of resistance R10, the other end ground connection of resistance R10, the contact 2 of variable resistance RW3 connects can power transformation
The inverting input terminal of the contact 3 of RW3 and one end of resistance R6, transport and placing device AR2 is hindered, another termination transport and placing device AR2's of resistance R6
The inverting input terminal of one end and transport and placing device AR1 of output end and resistance R9, the output terminating resistor R9's of transport and placing device AR1 is another
End.
By above technical scheme, the utility model has the following beneficial effects:
1. frequency collection circuit output signal is divided with variable resistance RW1, variable resistance RW2 and capacitor C3, capacitor C4
For two paths of signals, two paths of signals is the two paths of signals of same frequency, and transport and placing device AR2, transport and placing device AR3 and transport and placing device AR1 form difference
Amplifying circuit utilizes the symmetry of circuit parameter to signal differential processing, input terminal of the two paths of signals as differential amplifier circuit
And negative feedback, effectively stable quiescent point, inhibits common-mode signal, and the resistance value by adjusting variable resistance RW3 can
To adjust the output signal potential value of difference channel, ensure that signal stablizes calibration, when access control system failure, campus door
Access control system remote control terminal alarm module alert operation, can handle it in time.
Detailed description of the invention
Fig. 1 is the system module figure of the utility model.
Fig. 2 is the circuit diagram of the utility model.
Specific embodiment
Aforementioned and other technology contents, feature and effect in relation to the utility model, in following cooperation with reference to figures 1 through attached
Fig. 2 can be clearly presented in the detailed description of embodiment.The structure content being previously mentioned in following embodiment is to say
Bright book attached drawing is reference.
Each exemplary embodiment of the utility model is described below with reference to accompanying drawings.
Embodiment one, a kind of campus access control system, including frequency collection circuit, separation difference channel and frequency-selecting output electricity
Road, the analog signal of frequency collection circuit acquisition campus signal transmission passage input terminal in access control system controlling terminal,
The signal transmission passage is the channel that campus access control system controlling terminal receives signal analog signal, the separation differential electrical
Frequency collection circuit output signal is divided into two-way letter with variable resistance RW1, variable resistance RW2 and capacitor C3, capacitor C4 by road transport
Number, two paths of signals inputs transport and placing device AR2, transport and placing device AR3 non-inverting input terminal, transport and placing device AR2, transport and placing device AR3 and transport and placing device respectively
AR1 forms differential amplifier circuit to signal differential processing, by the resistance value adjustable difference channel for adjusting variable resistance RW3
Output signal potential value, last frequency-selecting output circuit form frequency selection circuit with resistance R11- resistance R13 and capacitor C5- capacitor C7
The signal for filtering out single-frequency is sent to the alarm module of campus access control system remote control terminal through signal projector E1
It is interior；
The separation difference channel is with variable resistance RW1, variable resistance RW2 and capacitor C3, capacitor C4 by frequency collection
Circuit output signal is divided into two paths of signals, and two paths of signals is the two paths of signals of same frequency, and two paths of signals inputs transport and placing device respectively
AR2, transport and placing device AR3 non-inverting input terminal, transport and placing device AR2, transport and placing device AR3 and transport and placing device AR1 composition differential amplifier circuit are to signal
Difference processing, input terminal of the two paths of signals as differential amplifier circuit have using the symmetry and negative feedback of circuit parameter
Quiescent point is stablized on effect ground, inhibits to common-mode signal, by the resistance value adjustable difference channel for adjusting variable resistance RW3
Output signal potential value, ensure that the calibration of stablizing of signal, one end of the 2 connecting resistance R3 of contact of variable resistance RW1, capacitor C4,
The contact 1 of variable resistance RW1 connects the other end of capacitor C4 and one end of capacitor C3, resistance R5, and the contact 3 of variable resistance RW1 connects
The other end of capacitor C3 and the non-inverting input terminal of transport and placing device AR2, one end of another terminating resistor R4 of resistance R3, resistance R4's is another
The contact 2 of one termination variable resistance RW2, the other end of the 1 connecting resistance R5 of contact of variable resistance RW2, the contact of variable resistance RW2
3 connect the non-inverting input terminal of transport and placing device AR3, the contact 1 of the anti-phase input termination variable resistance RW3 of transport and placing device AR3 and resistance R7's
One end, the other end of the output terminating resistor R7 of transport and placing device AR3 and one end of resistance R8, another termination transport and placing device of resistance R8
The non-inverting input terminal of AR1 and one end of resistance R10, the other end ground connection of resistance R10, the contact 2 of variable resistance RW3 connects can power transformation
The inverting input terminal of the contact 3 of RW3 and one end of resistance R6, transport and placing device AR2 is hindered, another termination transport and placing device AR2's of resistance R6
The inverting input terminal of one end and transport and placing device AR1 of output end and resistance R9, the output terminating resistor R9's of transport and placing device AR1 is another
End.
Embodiment two, on the basis of example 1, the frequency-selecting output circuit use resistance R11- resistance R13 and capacitor
C5- capacitor C7 composition frequency selection circuit filters out the signal of single-frequency, and through signal projector E1 to be sent to campus access control system remote
In the alarm module of process control terminal, when access control system failure, campus access control system remote control terminal alarm module report
Alert work, can handle it in time, one end of a terminating resistor R11 of capacitor C5 and the output end of transport and placing device AR1, capacitor C5's
One end of another termination capacitor C6, resistance R12, one end of another termination capacitor C7 of resistance R11, resistance R13, resistance R12, electricity
Hold the other end ground connection of C7, one end of another terminating resistor R14 of resistance R13 and the other end of capacitor C6, resistance R14's is another
Termination signal transmitter E1.
Embodiment three, on the basis of example 2, the frequency collection circuit 1 select the signal frequency of model SJ-ADC
The analog signal of rate collector J1 acquisition campus signal transmission passage input terminal in access control system controlling terminal, diode D2,
Diode D3 forms limit circuit and limits to signal, and one end of the power supply termination capacitor C1 of signal frequency collector J1 and power supply+
The ground terminal of 5V, signal frequency collector J1 are grounded, the other end and electricity of the output termination capacitor C1 of signal frequency collector J1
Hinder one end of R1, the cathode of voltage-stabiliser tube D1, the plus earth of voltage-stabiliser tube D1, one end and two of another termination capacitor C2 of resistance R1
The anode of the cathode of pole pipe D2, diode D3, the other end ground connection of capacitor C2, one end of the positive connecting resistance R2 of diode D2 and
The cathode of diode D3, the other end of another terminating resistor R3 of resistance R2.
The utility model is when specifically used, a kind of campus access control system, including frequency collection circuit, separation differential electrical
Road and frequency-selecting output circuit, frequency collection circuit acquisition campus are inputted with signal transmission passage in access control system controlling terminal
The analog signal at end, the signal transmission passage are the channels that campus access control system controlling terminal receives signal analog signal,
The separation difference channel exports frequency collection circuit with variable resistance RW1, variable resistance RW2 and capacitor C3, capacitor C4
Signal is divided into two paths of signals, and two paths of signals is the two paths of signals of same frequency, and two paths of signals inputs transport and placing device AR2, transport and placing device respectively
AR3 non-inverting input terminal, transport and placing device AR2, transport and placing device AR3 and transport and placing device AR1 composition differential amplifier circuit handle signal differential, and two
Input terminal of the road signal as differential amplifier circuit is effectively stablized quiet using the symmetry and negative feedback of circuit parameter
State operating point inhibits common-mode signal, the output signal electricity of the adjustable difference channel of resistance value by adjusting variable resistance RW3
Place value, ensure that the calibration of stablizing of signal, and last frequency-selecting output circuit uses resistance R11- resistance R13 and capacitor C5- capacitor C7
The signal that composition frequency selection circuit filters out single-frequency is sent to campus through signal projector E1 and remotely controls end with access control system
In the alarm module at end.
The above is to combine specific embodiment further detailed description of the utility model, and it cannot be said that originally
Utility model specific implementation is limited only to this；Belonging to the utility model and for those skilled in the technology concerned,
Under the premise of technical solutions of the utility model thinking, made expansion and the replacement of operating method, data should all be fallen in
Within scope of protection of the utility model.
Claims (4)
1. a kind of campus access control system, including frequency collection circuit, separation difference channel and frequency-selecting output circuit, feature exist
In: the analog signal of frequency collection circuit acquisition campus signal transmission passage input terminal in access control system controlling terminal,
The signal transmission passage is the channel that campus access control system controlling terminal receives signal analog signal, the separation differential electrical
Frequency collection circuit output signal is divided into two-way letter with variable resistance RW1, variable resistance RW2 and capacitor C3, capacitor C4 by road transport
Number, two paths of signals inputs transport and placing device AR2, transport and placing device AR3 non-inverting input terminal, transport and placing device AR2, transport and placing device AR3 and transport and placing device respectively
AR1 forms differential amplifier circuit to signal differential processing, by the resistance value adjustable difference channel for adjusting variable resistance RW3
Output signal potential value, last frequency-selecting output circuit form frequency selection circuit with resistance R11- resistance R13 and capacitor C5- capacitor C7
The signal for filtering out single-frequency is sent to the alarm module of campus access control system remote control terminal through signal projector E1
It is interior.
2. a kind of campus access control system according to claim 1, it is characterised in that: the separation difference channel includes can
Power transformation hinders RW1, and one end of the 2 connecting resistance R3 of contact of variable resistance RW1, capacitor C4, the contact 1 of variable resistance RW1 meets capacitor C4
The other end and capacitor C3, resistance R5 one end, the contact 3 of variable resistance RW1 connects the other end and transport and placing device AR2 of capacitor C3
Non-inverting input terminal, one end of another terminating resistor R4 of resistance R3, the contact 2 of another termination variable resistance RW2 of resistance R4 can
Power transformation hinders the other end of the 1 connecting resistance R5 of contact of RW2, and the contact 3 of variable resistance RW2 connects the non-inverting input terminal of transport and placing device AR3, transports
Put the contact 1 of the anti-phase input termination variable resistance RW3 of device AR3 and one end of resistance R7, the output terminating resistor of transport and placing device AR3
The one of the other end of R7 and one end of resistance R8, the non-inverting input terminal of another termination transport and placing device AR1 of resistance R8 and resistance R10
End, the other end ground connection of resistance R10, the contact 2 of variable resistance RW3 connect the contact 3 of variable resistance RW3 and one end of resistance R6,
The inverting input terminal of transport and placing device AR2, the output end of another termination transport and placing device AR2 of resistance R6 and one end and the amplifier of resistance R9
The inverting input terminal of device AR1, the other end of the output terminating resistor R9 of transport and placing device AR1.
3. a kind of campus access control system according to claim 1, it is characterised in that: the frequency-selecting output circuit includes electricity
Hold C5, one end of a terminating resistor R11 of capacitor C5 and the output end of transport and placing device AR1, another termination capacitor C6, the electricity of capacitor C5
Hinder one end of R12, one end of another termination capacitor C7 of resistance R11, resistance R13, the other end ground connection of resistance R12, capacitor C7,
One end of another terminating resistor R14 of resistance R13 and the other end of capacitor C6, another termination signal projector E1 of resistance R14.
4. a kind of campus access control system according to claim 2, it is characterised in that: the frequency collection circuit 1 includes
One end of the power supply termination capacitor C1 of the signal frequency collector J1 of model SJ-ADC, signal frequency collector J1 and power supply+
The ground terminal of 5V, signal frequency collector J1 are grounded, the other end and electricity of the output termination capacitor C1 of signal frequency collector J1
Hinder one end of R1, the cathode of voltage-stabiliser tube D1, the plus earth of voltage-stabiliser tube D1, one end and two of another termination capacitor C2 of resistance R1
The anode of the cathode of pole pipe D2, diode D3, the other end ground connection of capacitor C2, one end of the positive connecting resistance R2 of diode D2 and
The cathode of diode D3, the other end of another terminating resistor R3 of resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920422662.6U CN209462351U (en) | 2019-04-04 | 2019-04-04 | A kind of campus access control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920422662.6U CN209462351U (en) | 2019-04-04 | 2019-04-04 | A kind of campus access control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209462351U true CN209462351U (en) | 2019-10-01 |
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ID=68047588
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920422662.6U Expired - Fee Related CN209462351U (en) | 2019-04-04 | 2019-04-04 | A kind of campus access control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209462351U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323154A (en) * | 2020-04-21 | 2020-06-23 | 江苏弘扩信息科技有限公司 | Construction stress detection system based on block chain bridge |
| CN112039503A (en) * | 2020-08-04 | 2020-12-04 | 广州彩熠灯光股份有限公司 | Transmission circuit with differential signal out-of-band instruction, chip and electronic equipment |
-
2019
- 2019-04-04 CN CN201920422662.6U patent/CN209462351U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323154A (en) * | 2020-04-21 | 2020-06-23 | 江苏弘扩信息科技有限公司 | Construction stress detection system based on block chain bridge |
| CN112039503A (en) * | 2020-08-04 | 2020-12-04 | 广州彩熠灯光股份有限公司 | Transmission circuit with differential signal out-of-band instruction, chip and electronic equipment |
| CN112039503B (en) * | 2020-08-04 | 2024-03-19 | 广州彩熠灯光股份有限公司 | Transmission circuit, chip and electronic equipment of difference signal out-of-band instruction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20191001 Termination date: 20200404 |