CN108091026B - Two-wire access control system - Google Patents
Two-wire access control system Download PDFInfo
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- CN108091026B CN108091026B CN201810057959.7A CN201810057959A CN108091026B CN 108091026 B CN108091026 B CN 108091026B CN 201810057959 A CN201810057959 A CN 201810057959A CN 108091026 B CN108091026 B CN 108091026B
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- 239000003990 capacitor Substances 0.000 claims description 60
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000012795 verification Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 210000000056 organ Anatomy 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00944—Details of construction or manufacture
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
Abstract
The invention discloses a two-wire system access control system, which comprises an access host module, an electric lock module, an exit button module and a power module, wherein the two signal connection lines are respectively connected in parallel through the two signal connection lines; and after the two-wire system is adopted, the problem of wire connection error does not exist, and the debugging of wiring correctness is basically not needed. Meanwhile, after the two-wire system is adopted, a person with primary electrician knowledge can remove the line faults without a specification, so that the maintenance difficulty and cost are reduced.
Description
Technical Field
The invention relates to the field of access control systems, in particular to a two-wire access control system.
Background
In the current door control field, an independent door control system generally at least comprises four devices including a door control host, a magnetic lock (or an electric mortise lock and the like), a door outlet button and a power supply, but all the devices are connected together through a plurality of wires to perform power supply and signal transmission, so that the control function of the system is realized, and the final purpose is to swipe a card on the door control host or open the electric lock in other modes to finish the door control function. Since the equipment is produced by a manufacturer, the quality of operation of a single equipment is completely dependent on the manufacturer and is not greatly related to users, however, the final operation quality of a system consisting of a plurality of equipment is also dependent on engineering installation and wiring, the manufacturer does not participate in the process, and most after-sales service problems are not caused by product quality problems but are caused by engineering wiring links. At present, almost all access control hosts and supporting equipment need a plurality of outgoing lines to be connected with a system, and the access control hosts and the supporting equipment cannot be connected by mistake or less, otherwise, the whole system cannot work normally. There is no access control system with simple wiring and difficult error in the market, and professional installation personnel are required to complete wiring and debugging of the whole access control system, so that popularization and application of access control products are not facilitated.
In summary, the door control system of the prior art has the following disadvantages: 1. the problem that the leading-out wires of the entrance guard host are too many and are not easy to identify; 2. the problem of difficult debugging after the wiring error of the entrance guard host computer; 3. and the maintenance after sale is difficult.
Disclosure of Invention
In order to solve the problems, the invention provides a two-wire access control system, which effectively reduces the wiring construction cost and the technical requirements of installation constructors, thereby reducing the cost of the whole access control system.
In order to achieve the above purpose, the invention adopts the following technical scheme: the two-wire access control system comprises an access host module, an electric lock module, an access button module and a power module, wherein the access host module, the electric lock module, the access button module and the power module all comprise two signal connecting wires, the modules are connected with each other in parallel through the two signal connecting wires, and a loop formed by the two signal connecting wires of each module is a two-wire system circuit;
the entrance guard host module, the electric lock module and the exit button module are respectively provided with a polarity conversion circuit, a power carrier modulation-demodulation circuit and an MCU; the power carrier modulation and demodulation circuits on the access control host module, the electric lock module and the exit button module are in bidirectional digital communication connection with the MCU of the corresponding module, one end of the polarity conversion circuit is electrically connected with the power carrier modulation and demodulation circuit, and the other end of the polarity conversion circuit is connected with the two-wire system circuit through two signal connecting wires; the MCU in the access control host module is also connected with an input verification unit, the MCU in the exit button module is also connected with an exit button unit, and the MCU in the electric lock module is also connected with a switch unit; when the door-out button unit or the input verification unit sends out an unlocking request signal, the MCU in the door control host module sends out an unlocking signal to the MCU in the electric lock module, and the MCU in the electric lock module controls and drives the switch unit to unlock.
Specifically, all be equipped with the pilot lamp on entrance guard's host computer module, electric lock module, the button module that goes out, the pilot lamp is with the MCU electric connection of corresponding module.
Specifically, the switch unit in the electric lock module comprises a current driving circuit, an electromagnetic coil and a door magnetic switch, wherein the door magnetic switch is electrically connected with the MCU in the electric lock module, the current driving circuit is connected with the MCU in the electric lock module, the other end of the current driving circuit is electrically connected with one end of the electromagnetic coil, and the other end of the electromagnetic coil is connected between the polarity conversion circuit and the power carrier modulation-demodulation circuit.
Specifically, the input verification unit comprises a digital keyboard, an EM card reading circuit, an HID card reading circuit and an IC card reading circuit, wherein the digital keyboard, the EM card reading circuit, the HID card reading circuit and the IC card reading circuit are electrically connected with the MCU in the entrance guard host module.
Specifically, MCU in the entrance guard host computer module still is connected with bee calling organ, memory, prevents tearing open alarm, bluetooth/wiFi connecting circuit.
Specifically, a low-pass filter circuit and a voltage stabilizing output circuit are arranged in the access control host module, the electric lock module and the door outlet button module; the low-pass filter circuit comprises a first inductor (L1), a first resistor (R1), a third capacitor (C3) and a fourth capacitor (C4); the voltage stabilizing output circuit comprises a first control chip (U1), a fifth capacitor (C5) and a sixth capacitor (C6); the polarity conversion circuit comprises a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); the power carrier modulation-demodulation circuit comprises a second resistor (R2), a third resistor (R3), a first triode (Q1), a fifth diode (D5), a first capacitor (C1), a fourth resistor (R4), a second capacitor (C2), a fifth resistor (R5), a sixth resistor (R6), a second triode (Q2) and a seventh resistor (R7);
the anodes of the first diode (D1) and the third diode (D3) are grounded, the cathode of the first diode (D1) is connected with the anode of the second diode (D2), the cathode of the third diode (D3) is connected with the anode of the fourth diode (D4), the cathode of the second diode (D2) is connected with the cathode of the fourth diode (D4), and one ends of the two signal connecting wires are respectively connected with the cathodes of the first diode (D1) and the third diode (D3); the cathode of the second diode (D2) is connected with one end of a third capacitor (C3) through a first inductor (L1), and the other end of the third capacitor (C3) is grounded; the cathode of the fourth diode (D4) is connected with one end of a third capacitor (C3) through a first resistor (R1), and the other end of the third capacitor (C3) is grounded; the cathode of the second diode (D2) is connected with one end of a fourth capacitor (C4) through a first inductor (L1), and the other end of the fourth capacitor (C4) is grounded; the IN pin of the first control chip (U1) is connected with one end of a fourth capacitor (C4), the GND pin of the first control chip (U1) is grounded, the OUT pin of the first control chip (U1) is grounded through a fifth capacitor (C5), and the OUT pin of the first control chip U1 is grounded through a sixth capacitor (C6);
the negative electrode of the fourth diode (D4) is connected with the collector electrode of the first triode (Q1) through a third resistor (R3), the base electrode of the first triode (Q1) is connected with one end of a second resistor (R2), and the other end of the second resistor (R2) outputs a control signal;
the positive electrode of the fifth diode (D5) is connected with the negative electrode of the fourth diode (D4), the negative electrode of the fifth diode (D5) is connected with the emitter of the first triode (Q1) through a first capacitor (C1), and the negative electrode of the fifth diode (D5) is connected with the emitter of the first triode (Q1) through a fourth resistor (R4); one end of the second capacitor (C2) is connected with the negative electrode of the fifth diode (D5), the other end of the second capacitor is connected with one end of a fifth resistor (R5), the other end of the fifth resistor (R5) is connected with the base electrode of the second triode (Q2), the emitter of the first triode (Q1) is connected with the base electrode of the second triode (Q2) through a sixth resistor (R6), the emitter of the first triode (Q1) and the emitter of the second triode (Q2) are grounded, one end of a seventh resistor (R7) is connected with an OUT pin of the first control chip U1, the other end of the seventh resistor (R7) is connected with the collector electrode of the second triode (Q2), and the collector electrode of the second triode (Q2) receives a control signal.
Specifically, the power module comprises a direct current power supply and a low-pass filter circuit, wherein a first inductor (L1) and a first resistor (R1) in the low-pass filter circuit are connected in parallel, the positive electrode of the direct current power supply is connected with one signal connecting wire through the first inductor (L1), the negative electrode of the direct current power supply is grounded, and the other signal connecting wire is grounded.
Specifically, the direct current power supply is a 12V direct current power supply.
The invention has the beneficial effects that: the door control host module, the electric lock module, the door outlet button module and the power supply module all comprise two signal connecting wires, the modules are connected with each other in parallel through the two signal connecting wires, and a loop formed by the two signal connecting wires of each module is a two-wire system circuit; all modules only need to draw out two signal connecting wires, as the polarity conversion circuit is arranged in each module, the circuit damage caused by reverse connection of external circuits is prevented, so that the two signal connecting wires are not divided in polarity, each device of the system is connected together in a parallel manner through the two signal connecting wires, the power supply directly supplies power to each device, the simple connection manner is that after two wires are adopted, the polarity is not divided, the color is not divided, and the sequence of exchanging the two wires does not influence the functions; and after the two-wire system is adopted, the problem of wire connection error does not exist, and the debugging of wiring correctness is basically not needed. Meanwhile, after the two-wire system is adopted, the line fault can be removed only by a person with primary electrician knowledge without a specification, so that the maintenance difficulty and the maintenance cost are reduced.
Drawings
FIG. 1 is a block diagram of the structure of the present invention;
FIG. 2 is a block diagram of an access control host module according to the present invention.
Fig. 3 is a block diagram of a door button module according to the present invention.
Fig. 4 is a block diagram of an electric lock module according to the present invention.
Fig. 5 is a block diagram of a power module according to the present invention.
Fig. 6 is a circuit diagram common to the individual modules in the present invention.
Reference numerals illustrate: 1. an entrance guard host module; 2. a door-out button module; 3. an electric lock module; 4. a power module; 11. a polarity conversion circuit; 12. a power carrier modulation/demodulation circuit; MCU;14. an indicator light; 15. a voltage stabilizing output circuit; 16. a low pass filter circuit; 17. two-wire system lines; 110. a numeric keypad; em card reader circuit; HID card reading circuit; IC card reading circuit; 114. a memory; 115. an anti-disassembly alarm; 116. a buzzer; 117. a wireless connection circuit; 210. a door-out button unit; 310. a door magnetic switch; 311. a current driving circuit; 312. an electromagnetic coil; 410. a DC power supply.
Detailed Description
Referring to fig. 1-6, the present invention relates to a two-wire access control system, which comprises an access host module 1, an electric lock module 3, an exit button module 2 and a power module 4, wherein the access host module 1, the electric lock module 3, the exit button module 2 and the power module 4 all comprise two signal connection wires, the modules are connected in parallel through the two signal connection wires, and a loop formed by the two signal connection wires is a two-wire system circuit 17;
the entrance guard host module 1, the electric lock module 3 and the exit button module 2 are respectively provided with a polarity conversion circuit 11, a power carrier modulation-demodulation circuit 12 and an MCU13; the power carrier modulation and demodulation circuits 12 on the entrance guard host module 1, the electric lock module 3 and the exit button module 2 are in bidirectional digital communication connection with the MCU13 of the corresponding module, one end of the polarity conversion circuit 11 is electrically connected with the power carrier modulation and demodulation circuit 12, and the other end of the polarity conversion circuit is connected with the two-wire system circuit 17 through two signal connecting wires; the MCU13 in the entrance guard host module 1 is also connected with an input verification unit, the MCU13 in the exit button module 2 is also connected with an exit button unit 210, and the MCU13 in the electric lock module 3 is also connected with a switch unit; when the exit button unit 210 or the input verification unit sends out an unlocking request signal, the MCU13 in the entrance guard host module 1 sends out an unlocking signal to the MCU13 in the electric lock module 3, and the MCU13 in the electric lock module 3 controls and drives the switch unit to unlock.
Referring to fig. 1-6, the entrance guard host module 1, the electric lock module 3, the exit button module 2 and the power module 4 all comprise two signal connection lines, each module is connected in parallel through the two signal connection lines, wherein a loop formed by the two signal connection lines of each module is a two-wire system line 17; all modules only need to draw out two signal connecting wires, as the polarity conversion circuit 11 is arranged in each module, the circuit damage caused by the reverse connection of external circuits is prevented, so that the two signal connecting wires are not divided in polarity, each device of the system is connected together in a parallel manner through the two signal connecting wires, the power supply directly supplies power to each device, the simple connection manner is that after two wires are adopted, the polarity and the color are not divided, and the sequence of exchanging the two wires does not influence the functions; and after the two-wire system is adopted, the problem of wire connection error does not exist, and the debugging of wiring correctness is basically not needed. Meanwhile, after the two-wire system is adopted, a person with primary electrician knowledge can remove the line faults without a specification, so that the maintenance difficulty and cost are reduced.
Referring to fig. 2-4, specifically, the door control host module 1, the electric lock module 3, and the exit button module 2 are all provided with indicator lamps 14, and the indicator lamps 14 are electrically connected with the MCUs 13 of the corresponding modules. The door control host module 1, the electric lock module 3 and the door outlet button module 2 are provided with the indicator lamps 14, and when the door control host module 1, the electric lock module 3 and the door outlet button module 2 receive or send control signals, the indicator lamps 14 are lightened.
Referring to fig. 4, specifically, the switch unit in the electric lock module 3 includes a current driving circuit 311, an electromagnetic coil 312, and a door magnetic switch 310, wherein the door magnetic switch 310 is electrically connected to the MCU13 in the electric lock module 3, the current driving circuit 311 is connected to the MCU13 in the electric lock module 3, the other end is electrically connected to one end of the electromagnetic coil 312, and the other end of the electromagnetic coil 312 is connected between the polarity conversion circuit 11 and the power carrier modem circuit 12. When the MCU13 in the electric lock module 3 detects an unlocking signal sent by the entrance guard host module 1, the indicator lamp 14 in the electric lock module 3 is lightened, meanwhile, the electromagnetic coil 312 is controlled to be electrified or powered off through the current driving circuit 311, so that the electric lock is opened or closed, the MCU13 in the electric lock module 3 detects the door magnetic switch 310 to obtain a door state signal, and the door state signal is fed back to the entrance guard host module 1 through the power carrier modulation and demodulation circuit 12 and is used as a basis for alarming or door closing prompt.
Referring to fig. 2, specifically, the input verification unit includes a keypad 110, an EM card reading circuit 111, an HID card reading circuit 112, and an IC card reading circuit 113, where the keypad 110, the EM card reading circuit 111, the HID card reading circuit 112, and the IC card reading circuit 113 are electrically connected to the MCU13 in the entrance guard host module 1. In the invention, a plurality of unlocking methods are provided, wherein the multifunctional unlocking can be realized by inputting a digital password or reading an EM card or an HID card or an IC card.
Referring to fig. 2, specifically, the MCU13 in the door control host module 1 is further connected with a buzzer 116, a memory 114, an anti-disassembly alarm 115, and a wireless connection circuit 117, wherein the wireless connection circuit 117 is bluetooth or WiFi. The memory 114 is used for storing unlocking information, the anti-dismantling alarm 115 can be used for alarming, the Bluetooth or WiFi can be selected to realize a mobile phone control function, and when a card is swiped or a password is input, the MCU13 of the access control module outputs an unlocking signal to the two-wire system line 17 through the power carrier modulation and demodulation circuit 12 to inform the unlocking or closing of the electric lock.
Referring to fig. 2-6, specifically, the door control host module 1, the electric lock module 3, and the exit button module 2 are provided with a low-pass filter circuit 16 and a voltage stabilizing output circuit 15; the low-pass filter circuit 16 includes a first inductor L1, a first resistor R1, a third capacitor C3, and a fourth capacitor C4; the voltage stabilizing output circuit comprises a first control chip U1, a fifth capacitor C5 and a sixth capacitor C6; the polarity conversion circuit 11 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the power carrier modem circuit 12 includes a second resistor R2, a third resistor R3, a first triode Q1, a fifth diode D5, a first capacitor C1, a fourth resistor R4, a second capacitor C2, a fifth resistor R5, a sixth resistor R6, a second triode Q2, and a seventh resistor R7;
the anodes of the first diode D1 and the third diode D3 are grounded, the cathode of the first diode D1 is connected with the anode of the second diode D2, the cathode of the third diode D3 is connected with the anode of the fourth diode D4, the cathode of the second diode D2 is connected with the cathode of the fourth diode D4, and one ends of the two signal connecting wires are respectively connected with the cathodes of the first diode D1 and the third diode D3; the cathode of the second diode D2 is connected with one end of a third capacitor C3 through a first inductor L1, and the other end of the third capacitor C3 is grounded; the cathode of the fourth diode D4 is connected with one end of the third capacitor C3 through the first resistor R1, and the other end of the third capacitor C3 is grounded; the cathode of the second diode D2 is connected with one end of a fourth capacitor C4 through a first inductor L1, and the other end of the fourth capacitor C4 is grounded; the IN pin of the first control chip U1 is connected with one end of the fourth capacitor C4, the GND pin of the first control chip U1 is grounded, the OUT pin of the first control chip U1 is grounded through the fifth capacitor C5, and the OUT pin of the first control chip U1 is grounded through the sixth capacitor C6;
the first control chip U1, the fifth capacitor C5 and the sixth capacitor C6; a voltage stabilizing circuit is formed to provide +5V power supply for the MCU13 and the peripheral circuit;
wherein the first diode D1, the second diode D2, the third diode D3, the fourth diode D4; the bridge rectification is formed as polarity conversion to prevent circuit damage caused by reverse connection of external circuits, so that after a two-wire system is adopted, the problem of wire connection error does not exist, and the debugging of wire connection correctness is basically not needed.
The first inductor L1, the first resistor R1, the third capacitor C3 and the fourth capacitor C4; the low-pass filter circuit 16 is constituted to prevent attenuation of the external line high-frequency signal.
The negative electrode of the fourth diode D4 is connected with the collector electrode of the first triode Q1 through a third resistor R3, the base electrode of the first triode Q1 is connected with one end of a second resistor R2, and the other end of the second resistor R2 outputs a control signal;
the positive electrode of the fifth diode D5 is connected with the negative electrode of the fourth diode D4, the negative electrode of the fifth diode D5 is connected with the emitter of the first triode Q1 through the first capacitor C1, and the negative electrode of the fifth diode D5 is connected with the emitter of the first triode Q1 through the fourth resistor R4; one end of the second capacitor C2 is connected to the negative electrode of the fifth diode D5, the other end of the second capacitor C2 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the base of the second triode Q2, the emitter of the first triode Q1 is connected to the base of the second triode Q2 through the sixth resistor R6, the emitter of the first triode Q1 and the emitter of the second triode Q2 are grounded, one end of the seventh resistor R7 is connected to the OUT pin of the first control chip U1, the other end of the seventh resistor R7 is connected to the collector of the second triode Q2, and the collector of the second triode Q2 receives the control signal.
Referring to fig. 5, specifically, the power module 4 includes a dc power supply 410 and a low-pass filter circuit 16, wherein a first inductor L1 and a first resistor R1 in the low-pass filter circuit 16 are connected in parallel, an anode of the dc power supply 410 is connected to one of the signal connection lines through the first inductor L1, a cathode of the dc power supply 410 is grounded, and the other signal connection line is grounded. Specifically, the dc power supply 410 is a 12V dc power supply 410.
Referring to fig. 1-6, the control signals of the MCUs 13 of each module, including the second resistor R2, the third resistor R3, and the first triode Q1, are output to an external circuit, the first inductor L1 of the power supply boosts the output signal and outputs a relatively high pulse voltage, and as a modulated signal, the fifth diode D5, the first capacitor C1, the fourth resistor R4, the second capacitor C2, the fifth resistor R5, the sixth resistor R6, the second triode Q2, and the seventh resistor R7 form a detection circuit of a high-frequency signal, so that the control signals on the two-wire system circuit 17 are demodulated and sent to the MCUs 13 of other modules for identification, and the information exchange between the devices is completed through the two-wire system circuit 17.
Referring to fig. 1-6, the following specifically describes a specific workflow of a two-wire access control system:
1. when a user walks out of the access control from the access control;
step 1: the user presses the exit button unit 210, wherein the MCU13 of the exit button module 2 detects that the exit button unit 210 is pressed, the indicator lamp 14 in the exit button module 2 is turned on, and simultaneously, a door opening request signal is output to the two-wire system line 17 through the power carrier modem circuit 12 in the exit button module 2; the power module 4 performs boosting processing on the door opening request signal, outputs relatively high pulse voltage and outputs a modulated door opening request signal;
step 2: the modulated door opening request signal is transmitted to the door control host module 1 through the two-wire system line 17, meanwhile, the indication lamp 14 in the door control host module 1 is turned on, the door control host module 1 demodulates the modulated door opening request signal through the power carrier modulation demodulation circuit 12 in the door control host module 1, and transmits the demodulated door opening request signal to the MCU13 in the door control host module 1, wherein the MCU13 in the door control host module 1 outputs a door opening command signal to the two-wire system line 17 after receiving the demodulated door opening request signal; the power module 4 performs boosting processing on the output door opening command signal, outputs relatively high pulse voltage, and outputs a modulated door opening command signal;
step 3: the modulated door opening command signal is transmitted to the electric lock module 3 through the two-wire system line 17, the indicator lamp 14 in the electric lock module 3 is turned on, meanwhile, the power carrier modulation demodulation circuit 12 of the electric lock module 4 demodulates the modulated door opening command signal and transmits the demodulated door opening request signal to the MCU13 in the electric lock module 3, wherein after the MCU13 in the electric lock module 3 receives the demodulated door opening command signal, the current driving circuit 311 is driven and the electromagnetic coil 312 is controlled to be powered off, so that the electric lock is closed; meanwhile, the MCU13 in the electric lock module 3 detects the door magnetic switch 310, acquires a door state signal, and feeds back the door magnetic switch to the entrance guard host module 1 through the power carrier modulation-demodulation circuit 12 to be used as a basis for alarming or door closing prompt.
2. When a user walks into the door from outside the door, the door is closed:
step 1: after a user inputs a correct password through the numeric keypad 110 or performs a correct card swiping through the EM card reading circuit 111, the HID card reading circuit 112 or the IC card reading circuit 113, the MCU13 of the entrance guard host module 1 may acquire a door opening request signal, and the indicator lamp 14 in the entrance guard host module 1 is turned on; after the MCU13 of the door control host module 1 obtains the door opening request signal, the MCU outputs a door opening command signal to the two-wire system line 17 through the power carrier modulation demodulation circuit 12, and the power module 4 performs boost processing on the output door opening command signal, outputs a relatively high pulse voltage, and outputs a modulated door opening command signal;
step 2: the modulated door opening command signal is transmitted to the electric lock module 3 through a two-wire system line 17, an indicator lamp 14 in the electric lock module 3 is lightened, meanwhile, a power carrier modulation demodulation circuit 12 of the electric lock module 4 demodulates the modulated door opening command signal and transmits the demodulated door opening request signal to an MCU13 in the electric lock module 3, wherein after the MCU13 in the electric lock module 3 receives the demodulated door opening command signal, a current driving circuit 311 is driven and an electromagnetic coil 312 is controlled to be powered off, so that the electric lock is closed; meanwhile, the MCU13 in the electric lock module 3 detects the door magnetic switch 310, acquires a door state signal, and feeds back the door magnetic switch to the entrance guard host module 1 through the power carrier modulation-demodulation circuit 12 to be used as a basis for alarming or door closing prompt.
The above embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (8)
1. The utility model provides a two-wire system entrance guard control system, includes entrance guard host computer module, electric lock module, button module and power module of going out, its characterized in that: the door control host module, the electric lock module, the door outlet button module and the power supply module all comprise two signal connecting wires, the modules are connected with each other in parallel through the two signal connecting wires, and a loop formed by the two signal connecting wires of each module is a two-wire system circuit;
the entrance guard host module, the electric lock module and the exit button module are respectively provided with a polarity conversion circuit, a power carrier modulation-demodulation circuit and an MCU; the power carrier modulation and demodulation circuits on the access control host module, the electric lock module and the exit button module are in bidirectional digital communication connection with the MCU of the corresponding module, one end of the polarity conversion circuit is electrically connected with the power carrier modulation and demodulation circuit, and the other end of the polarity conversion circuit is connected with the two-wire system circuit through two signal connecting wires; the MCU in the access control host module is also connected with an input verification unit, the MCU in the exit button module is also connected with an exit button unit, and the MCU in the electric lock module is also connected with a switch unit; when the door-out button unit or the input verification unit sends out an unlocking request signal, the MCU in the door control host module sends out an unlocking signal to the MCU in the electric lock module, and the MCU in the electric lock module controls and drives the switch unit to unlock.
2. The two-wire access control system of claim 1, wherein: the door control system comprises an access control host module, an electric lock module and a door outlet button module, wherein the access control host module, the electric lock module and the door outlet button module are respectively provided with an indicator lamp, and the indicator lamps are electrically connected with the MCUs of the corresponding modules.
3. The two-wire access control system of claim 1, wherein: the switch unit in the electric lock module comprises a current driving circuit, an electromagnetic coil and a door magnetic switch, wherein the door magnetic switch is electrically connected with the MCU in the electric lock module, the current driving circuit is connected with the MCU in the electric lock module, the other end of the current driving circuit is electrically connected with one end of the electromagnetic coil, and the other end of the electromagnetic coil is connected between the polarity conversion circuit and the power carrier modulation-demodulation circuit.
4. The two-wire access control system of claim 1, wherein: the input verification unit comprises a digital keyboard, an EM card reading circuit, an HID card reading circuit and an IC card reading circuit, wherein the digital keyboard, the EM card reading circuit, the HID card reading circuit and the IC card reading circuit are electrically connected with the MCU in the entrance guard host module.
5. The two-wire access control system of claim 1, wherein: MCU in the entrance guard host computer module still is connected with bee calling organ, memory, prevents tearing open alarm, bluetooth/wiFi connecting circuit.
6. The two-wire access control system of claim 1, wherein: the door control host module, the electric lock module and the door outlet button module are respectively provided with a low-pass filter circuit and a voltage stabilizing output circuit; the low-pass filter circuit comprises a first inductor (L1), a first resistor (R1), a third capacitor (C3) and a fourth capacitor (C4); the voltage stabilizing output circuit comprises a first control chip (U1), a fifth capacitor (C5) and a sixth capacitor (C6); the polarity conversion circuit comprises a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); the power carrier modulation-demodulation circuit comprises a second resistor (R2), a third resistor (R3), a first triode (Q1), a fifth diode (D5), a first capacitor (C1), a fourth resistor (R4), a second capacitor (C2), a fifth resistor (R5), a sixth resistor (R6), a second triode (Q2) and a seventh resistor (R7);
the anodes of the first diode (D1) and the third diode (D3) are grounded, the cathode of the first diode (D1) is connected with the anode of the second diode (D2), the cathode of the third diode (D3) is connected with the anode of the fourth diode (D4), the cathode of the second diode (D2) is connected with the cathode of the fourth diode (D4), and one ends of the two signal connecting wires are respectively connected with the cathodes of the first diode (D1) and the third diode (D3); the cathode of the second diode (D2) is connected with one end of a third capacitor (C3) through a first inductor (L1), and the other end of the third capacitor (C3) is grounded;
the cathode of the fourth diode (D4) is connected with one end of a third capacitor (C3) through a first resistor (R1), and the other end of the third capacitor (C3) is grounded; the cathode of the second diode (D2) is connected with one end of a fourth capacitor (C4) through a first inductor (L1), and the other end of the fourth capacitor (C4) is grounded; the IN pin of the first control chip (U1) is connected with one end of a fourth capacitor (C4), the GND pin of the first control chip (U1) is grounded, the OUT pin of the first control chip (U1) is grounded through a fifth capacitor (C5), and the OUT pin of the first control chip (U1) is grounded through a sixth capacitor (C6); the negative electrode of the fourth diode (D4) is connected with the collector electrode of the first triode (Q1) through a third resistor (R3), the base electrode of the first triode (Q1) is connected with one end of a second resistor (R2), and the other end of the second resistor (R2) outputs a control signal;
the positive electrode of the fifth diode (D5) is connected with the negative electrode of the fourth diode (D4), the negative electrode of the fifth diode (D5) is connected with the emitter of the first triode (Q1) through a first capacitor (C1), and the negative electrode of the fifth diode (D5) is connected with the emitter of the first triode (Q1) through a fourth resistor (R4); one end of the second capacitor (C2) is connected with the negative electrode of the fifth diode (D5), the other end of the second capacitor is connected with one end of the fifth resistor (R5), the other end of the fifth resistor (R5) is connected with the base electrode of the second triode (Q2), the emitter of the first triode (Q1) is connected with the base electrode of the second triode (Q2) through a sixth resistor (R6), the emitter of the first triode (Q1) and the emitter of the second triode (Q2) are grounded, one end of the seventh resistor (R7) is connected with an OUT pin of the first control chip (U1), the other end of the seventh resistor (R7) is connected with the collector electrode of the second triode (Q2), and the collector electrode of the second triode (Q2) receives a control signal.
7. The two-wire access control system of claim 6, wherein: the power module comprises a direct current power supply and a low-pass filter circuit, wherein a first inductor (L1) and a first resistor (R1) in the low-pass filter circuit are connected in parallel, the positive electrode of the direct current power supply is connected with one signal connecting wire through the first inductor (L1), the negative electrode of the direct current power supply is grounded, and the other signal connecting wire is grounded.
8. The two-wire access control system of claim 7, wherein: the direct current power supply is a 12V direct current power supply.
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| CN201810057959.7A CN108091026B (en) | 2018-01-18 | 2018-01-18 | Two-wire access control system |
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| CN114584177A (en) * | 2021-12-31 | 2022-06-03 | 深圳达实物联网技术有限公司 | Access control system based on direct current carrier communication |
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