CN208888822U - A kind of campus access-control card reader circuit - Google Patents

Abstract

The utility model discloses a kind of campus access-control card reader circuits, including RFID signal collector, signal amplifier, single-chip microcontroller, tuning circuit and RFID read module, RFID signal collector connects single-chip microcontroller by signal amplifier, single-chip microcontroller is separately connected tuning circuit and RFID read module, RFID read module signal connects RFID identification card, the utility model structural principle is simple, it can be realized the quick identification to RFID card, accuracy of identification is high, the tuning circuit of use is able to carry out dynamic and compensates, realize antenna automatic tuning, improve anti-interference ability, further improve card reading efficiency.

Description

A kind of campus access-control card reader circuit

Technical field

The utility model relates to card reader technical field, specially a kind of campus access-control card reader circuit.

Background technique

Non-contact IC card (induction type IC card) card reader of gate inhibition is the important component of access control system, is door The key equipment of access control system signal input, if access control system ratio is a people, eyes of the card reader like people.It closes It is the stability of entire access control system.If an access control system controller and electric lock are all good, if the quality of card reader It is problematic, situations such as equally door being caused not opened, influence the examination and use of engineering.

Currently, the access-control reader device used in campus can be realized the reading to access card, still, reading accuracy is low, Poor anti jamming capability, therefore, it is necessary to be improved to card reader circuit.

Utility model content

The purpose of this utility model is to provide a kind of campus access-control card reader circuits, to solve to mention in above-mentioned background technique Out the problem of.

To achieve the above object, the utility model provides the following technical solutions: a kind of campus access-control card reader circuit, packet Include RFID signal collector, signal amplifier, single-chip microcontroller, tuning circuit and RFID read module, the RFID signal collector Single-chip microcontroller is connected by signal amplifier, the single-chip microcontroller is separately connected tuning circuit and RFID read module, and the RFID is read Modulus block signal connection control chip.

Preferably, the tuning circuit includes field effect transistor A, field effect transistor B, field effect transistor C and field Effect transistor D, the field effect transistor A drain electrode are separately connected the one end capacitor D and the one end capacitor E, and it is another that source electrode connects capacitor D One end, the one end capacitor C are simultaneously grounded, and the capacitor C other end is separately connected field effect transistor A grid and the one end resistance C；

The field effect transistor B drain electrode is separately connected the one end capacitor L and the one end capacitor M, and it is another that source electrode is separately connected capacitor M One end, the one end capacitor N are simultaneously grounded, and grid is separately connected the capacitor N other end and the one end resistance F.

Preferably, the field effect transistor C drain electrode is separately connected the one end capacitor H, the one end capacitor J, and source electrode is separately connected The capacitor J other end, the one end capacitor K are simultaneously grounded, and grid is separately connected the capacitor K other end and the one end resistance E；

The field effect transistor D drain electrode is separately connected the one end capacitor O, the one end capacitor A, and it is another that source electrode is separately connected capacitor A One end, the one end capacitor B are simultaneously grounded, and grid is separately connected the capacitor B other end and the one end resistance B.

Preferably, the RFID read module includes control chip, low pressure difference linear voltage regulator, reader chip, first Impedance variations device, the second impedance variations device, directional coupler, amplifier, RF switch, the low pressure difference linear voltage regulator and control The connection of coremaking piece, the control chip connect with reader chip, the reader chip respectively with the first impedance variations device, the The connection of two impedance variations devices, the first impedance variations device are connect with directional coupler, the second impedance variations device and amplification Device connection, the directional coupler, amplifier are connect with RF switch respectively.

Compared with prior art, the utility model has the beneficial effects that

(1) the utility model structural principle is simple, can be realized the quick identification to RFID card, and accuracy of identification is high, uses Tuning circuit be able to carry out dynamic compensate, realize antenna automatic tuning, improve anti-interference ability, further improve card reading Efficiency.

(2) read-write capability of ultrahigh frequency electronic tag may be implemented in the RFID read module that the utility model uses, and simplifies Peripheral circuit, reduces the production cost.

Detailed description of the invention

Fig. 1 is the utility model principle block diagram；

Fig. 2 is the utility model tuning circuit schematic diagram；

Fig. 3 is the utility model RFID read module schematic diagram.

In figure: 1, RFID signal collector；2, signal amplifier；3, single-chip microcontroller；4, tuning circuit；5, RFID reads mould Block；6, chip is controlled；7, low pressure difference linear voltage regulator；8, reader chip；9, the first impedance variations device；10, the second impedance becomes Change device；11, directional coupler；12, amplifier；13, RF switch.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Fig. 1-3 is please referred to, the utility model provides a kind of technical solution: a kind of campus access-control card reader circuit, including RFID signal collector 1, signal amplifier 2, single-chip microcontroller 3, tuning circuit 4 and RFID read module 5, the RFID signal acquisition Device 1 connects single-chip microcontroller 3 by signal amplifier 2, and the single-chip microcontroller 3 is separately connected tuning circuit 4 and RFID read module 5, institute State 5 signal of RFID read module connection control chip 6.

In the utility model, tuning circuit 4 includes field effect transistor A1c, field effect transistor B2c, field effect transistor Pipe C3c and field effect transistor D4c, the field effect transistor A1c drain electrode are separately connected the one end capacitor D4b and capacitor E5b mono- End, the source electrode connection capacitor D4b other end, the one end capacitor C3b are simultaneously grounded, and the capacitor C3b other end is separately connected field-effect crystalline substance Body pipe A1c grid and the one end resistance C3a；

The field effect transistor B2c drain electrode is separately connected the one end capacitor L12b and the one end capacitor M13b, and source electrode connects respectively It connects the capacitor M13b other end, the one end capacitor N14b and is grounded, grid is separately connected the capacitor N14b other end and the one end resistance F6a； Field effect transistor C3c drain electrode is separately connected the one end capacitor H8b, the one end capacitor J10b, and it is another that source electrode is separately connected capacitor J10b End, the one end capacitor K11b are simultaneously grounded, and grid is separately connected the capacitor K11b other end and the one end resistance E5a；

The field effect transistor D4c drain electrode is separately connected the one end capacitor O15b, the one end capacitor A1b, and source electrode is separately connected The capacitor A1b other end, the one end capacitor B2b are simultaneously grounded, and grid is separately connected the capacitor B2b other end and the one end resistance B2a.It uses Tuning circuit is able to carry out dynamic and compensates, and realizes antenna automatic tuning, improves anti-interference ability, further improves card reading effect Rate.

In the utility model, RFID read module 5 includes control chip 6, low pressure difference linear voltage regulator 7, reader chip 8, the first impedance variations device 9, the second impedance variations device 10, directional coupler 11, amplifier 12, RF switch 13, the low pressure Difference linear constant voltage regulator 7 is connect with control chip 6, and the control chip 6 is connect with reader chip 8, and the reader chip 8 divides It is not connect with the first impedance variations device 9, the second impedance variations device 10, the first impedance variations device 9 connects with directional coupler 11 Connect, the second impedance variations device 10 is connect with amplifier 12, the directional coupler 11, amplifier 12 respectively with RF switch 13 connections.Control chip is the main control chip of module for reading and writing, and main function is communicated with external equipment, manages and monitors and is internal Module working condition realizes the read-write operation of module for reading and writing；Reader chip is functional module, and groundwork is to complete module Uplink receiving and downlink, the coding and decoding of signal and ISO180000-6B/6C protocol processes；Impedance variations device is completed Reader chip difference turns single-ended transmitting and reception；Amplifier completes rf modulated signal amplification, and faint radiofrequency signal is put Specified output power is arrived greatly；Directional coupler is completed to receive signal coupling and receiving and transmitting signal separation；RF switch completes letter Number switching, pass through time-sharing multiplex complete multichannel transmitting.The RFID read module that the utility model uses may be implemented The read-write capability of ultrahigh frequency electronic tag, simplifies peripheral circuit, reduces the production cost.

In conclusion the utility model structural principle is simple, the quick identification to RFID card, accuracy of identification can be realized It is high.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (4)

1. a kind of campus access-control card reader circuit, including RFID signal collector (1), signal amplifier (2), single-chip microcontroller (3), tune Humorous circuit (4) and RFID read module (5), it is characterised in that: the RFID signal collector (1) passes through signal amplifier (2) It connects single-chip microcontroller (3), the single-chip microcontroller (3) is separately connected tuning circuit (4) and RFID read module (5), and the RFID is read Module (5) signal connection control chip (6).

2. a kind of campus access-control card reader circuit according to claim 1, it is characterised in that: tuning circuit (4) packet Include field effect transistor A (1c), field effect transistor B (2c), field effect transistor C (3c) and field effect transistor D (4c), institute It states field effect transistor A (1c) drain electrode and is separately connected the one end (4b) capacitor D and the one end capacitor E (5b), source electrode connects capacitor D (4b) The other end, the one end (3b) capacitor C are simultaneously grounded, capacitor C (3b) other end be separately connected field effect transistor A (1c) grid and The one end resistance C (3a)；

Field effect transistor B (2c) drain electrode is separately connected the one end (12b) capacitor L and the one end capacitor M (13b), source electrode difference Connection capacitor M (13b) other end, the one end (14b) capacitor N are simultaneously grounded, and grid is separately connected capacitor N (14b) other end and resistance F The one end (6a).

3. a kind of campus access-control card reader circuit according to claim 2, it is characterised in that: the field effect transistor C (3c) drain electrode is separately connected the one end capacitor H (8b), the one end capacitor J (10b), and source electrode is separately connected capacitor J (10b) other end, electricity Hold the one end (11b) K and be grounded, grid is separately connected capacitor K (11b) other end and the one end resistance E (5a)；

Field effect transistor D (4c) drain electrode is separately connected the one end capacitor O (15b), the one end capacitor A (1b), and source electrode connects respectively It connects capacitor A (1b) other end, the one end (2b) capacitor B and is grounded, grid is separately connected capacitor B (2b) other end and resistance B (2a) One end.

4. a kind of campus access-control card reader circuit according to claim 1, it is characterised in that: the RFID read module It (5) include control chip (6), low pressure difference linear voltage regulator (7), reader chip (8), the first impedance variations device (9), the second resistance Anti- variator (10), directional coupler (11), amplifier (12), RF switch (13), the low pressure difference linear voltage regulator (7) with Chip (6) connection is controlled, the control chip (6) connect with reader chip (8), and the reader chip (8) is respectively with the One impedance variations device (9), the second impedance variations device (10) connect, the first impedance variations device (9) and directional coupler (11) Connection, the second impedance variations device (10) connect with amplifier (12), and the directional coupler (11), amplifier (12) are respectively It is connect with RF switch (13).