An access control card reader with RCC communication function

Abstract

This utility model belongs to the technical field of access control card readers, specifically disclosing an access control card reader with RCC communication function, including an MCU control circuit, an RCC communication circuit, an RS485 communication circuit, a power supply circuit, an RF drive circuit, an RF antenna, a buzzer drive circuit, and a three-color backlight drive circuit. This utility model, by setting up an RCC communication circuit, enables the access control card reader to read the physical card number of a mobile phone SIM card, outputting it to the MCU via UART. The MCU then outputs the physical card number of the SIM card to the external access control controller via the RS485 communication circuit to open the door. This retains the current user habit of using mobile phones to swipe cards while avoiding security risks to access control management. Furthermore, the overall circuit design ensures stable operation of the access control card reader.

Description

Technical Field

[0001] This utility model relates to the field of access control card reader technology, and in particular to an access control card reader with RCC communication function. Background Technology

[0002] In access control systems, access card readers are an essential component, usually installed on the door frame or wall at the entrance. The most common access card readers on the market mainly use RFID card swiping for access, but also support mobile phone NFC card swiping for access.

[0003] In modern society, almost everyone owns a smartphone, and most smartphones have NFC functionality. People are increasingly using their phones to swipe cards instead of traditional access cards. However, when using a phone to swipe a card, one first copies a physical access card to the phone's e-wallet, and then simply holds the phone close to the access card reader to replace the traditional access card. This poses a significant security risk to access control management: a single access card can be copied and used by countless people. It is conceivable that in the event of a security incident, it would be impossible to trace the source of the access data.

[0004] RCC (Range Controlled Communication) technology uses the 2.45GHz frequency band combined with low-frequency magnetic technology, simultaneously solving the problems of signal penetration through mobile phones and distance control, enabling near-field communication functions to be realized on SIM cards. When an access control card reader supports RCC technology, the reader reads the physical card number on the mobile phone's SIM card. SIM cards cannot be copied, and the physical card number is unique at the factory and cannot be modified. This preserves the current user habit of using mobile phones to swipe cards and avoids security risks to access control management.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to solve the technical problems existing in the background art. To this end, an access control card reader with RCC communication function is provided.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An access control card reader with RCC communication function includes an MCU control circuit, an RCC communication circuit and an RS485 communication circuit;

[0009] The MCU control circuit includes a control chip U2;

[0010] The RCC communication circuit includes an RCC communication module P2, pin 3 of the RCC communication module P2 is electrically connected to pin 21 of the control chip U2, and pin 4 of the RCC communication module P2 is electrically connected to pin 22 of the control chip U2.

[0011] The RS485 communication circuit includes an RS485 communication chip U8. Pin 1 of the RS485 communication chip U8 is electrically connected to pin 31 of the control chip U2. Pins 2 and 3 of the RS485 communication chip U8 are electrically connected to pin 46 of the control chip U2. Pin 4 of the RS485 communication chip U8 is electrically connected to pin 30 of the control chip U2. Pin 6 of the RS485 communication chip U8 is electrically connected to pin 3 of terminal P1 through resistor R2 and Zener diode D6. Pin 7 of the RS485 communication chip U8 is electrically connected to pin 4 of terminal P1 through resistor R3 and Zener diode D7.

[0012] The following is a further defined technical solution of this utility model: pin 6 of the RS485 communication chip U8 is electrically connected to one end of resistor R2, the other end of resistor R2 is electrically connected to pin 3 of terminal P1, pin 3 of terminal P1 is electrically connected to the cathode of Zener diode D6, and the anode of Zener diode D6 is grounded; pin 7 of the RS485 communication chip U8 is electrically connected to one end of resistor R3, the other end of resistor R3 is electrically connected to pin 4 of terminal P1, pin 4 of terminal P1 is electrically connected to the cathode of Zener diode D7, and the anode of Zener diode D7 is grounded.

[0013] The following is a further defined technical solution of this utility model, which also includes a power supply circuit. The power supply circuit includes a step-down switching power supply chip U3. Pin 5 of the step-down switching power supply chip U3 is electrically connected to the cathode of a Zener diode D2. The anode of the Zener diode D2 is connected to a 12V DC voltage. Pin 5 of the step-down switching power supply chip U3 is grounded through a parallel electrolytic capacitor E1 and a capacitor C56. A capacitor C38 is electrically connected between pins 1 and 6 of the step-down switching power supply chip U3. The buck switching power supply chip U3 has an inductor L3, a capacitor C23, and a resistor R71 electrically connected between pins 6 and 3. The capacitor C23 and the resistor R71 are connected in parallel and then in series with the inductor L3. The connection point between the inductor L3 and the capacitor C23 serves as the VCC output terminal. The VCC output terminal is grounded through electrolytic capacitors C1 and C60, which are connected in parallel. Pin 3 of the buck switching power supply chip U3 is grounded through a resistor R72.

[0014] The following is a further defined technical solution of this utility model: the VCC output terminal is electrically connected to pin 1 of the voltage regulator chip U1, the VCC output terminal is electrically connected to pin 3 of the voltage regulator chip U1 through resistor R91, pin 5 of the voltage regulator chip U1 serves as the V3.3 output terminal, and the V3.3 output terminal is grounded through electrolytic capacitor C57 and capacitor C58, wherein electrolytic capacitor C57 and capacitor C58 are connected in parallel.

[0015] The following is a further defined technical solution of this utility model: the MCU control circuit is electrically connected to the radio frequency drive circuit, the radio frequency drive circuit includes an RFID drive chip U11, pin 31 of the RFID drive chip U11 is electrically connected to pin 14 of the control chip U2, pin 30 of the RFID drive chip U11 is electrically connected to pin 16 of the control chip U2, pin 29 of the RFID drive chip U11 is electrically connected to pin 15 of the control chip U2, and pin 21 of the RFID drive chip U11 is electrically connected to pin 18 of the control chip U2.

[0016] The following is a further defined technical solution of this utility model: the radio frequency driving circuit is electrically connected to the radio frequency antenna.

[0017] The following is a further defined technical solution of this utility model: the MCU control circuit is electrically connected to the buzzer drive circuit, the buzzer drive circuit includes a transistor Q7, the base of the transistor Q7 is electrically connected to pin 11 of the control chip U2 through a resistor R60, the emitter of the transistor Q7 is grounded, the collector of the transistor Q7 is electrically connected to pin 2 of the buzzer SPK1, pin 1 of the buzzer SPK1 is electrically connected to the VCC output terminal of the power supply circuit, and a diode D1 is electrically connected between pin 1 and pin 2 of the buzzer SPK1.

[0018] The following is a further defined technical solution of this utility model: the MCU control circuit is electrically connected to the three-color backlight driving circuit, and the three-color backlight driving circuit includes transistors Q2, Q4, and Q10.

[0019] The base of transistor Q2 is electrically connected to pin 33 of control chip U2 through resistor R52, the collector of transistor Q2 is grounded, and the emitter of transistor Q2 is electrically connected to pin 4 of terminal JP3 through resistor R7.

[0020] The base of transistor Q4 is electrically connected to pin 32 of control chip U2 through resistor R56, the collector of transistor Q4 is grounded, and the emitter of transistor Q4 is electrically connected to pin 3 of terminal JP3 through resistor R8.

[0021] The base of transistor Q10 is electrically connected to pin 29 of control chip U2 through resistor R22, the collector of transistor Q10 is grounded, and the emitter of transistor Q10 is electrically connected to pin 2 of terminal JP3 through resistor R20.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] This invention incorporates an RCC communication circuit, enabling the access control card reader to read the physical card number of a mobile phone SIM card and output it to the MCU via UART. The MCU then outputs the physical card number of the SIM card to the external access control controller via an RS485 communication circuit to open the door. This approach retains the current user habit of using mobile phones to swipe cards while avoiding security risks to access control management. Furthermore, the overall circuit design ensures stable operation of the access control card reader.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a circuit connection block diagram of this utility model;

[0027] Figure 2 This is a circuit connection diagram of the MCU control circuit in this utility model;

[0028] Figure 3 This is a circuit connection diagram of the power supply circuit in this utility model;

[0029] Figure 4 This is a circuit connection diagram of the radio frequency drive circuit and the radio frequency antenna in this utility model, wherein the circuit on the left is the radio frequency drive circuit and the circuit on the right is the radio frequency antenna.

[0030] Figure 5 This is a circuit connection diagram of the RCC communication circuit in this utility model;

[0031] Figure 6 This is a circuit connection diagram of the RS485 communication circuit in this utility model;

[0032] Figure 7 This is a circuit connection diagram of the buzzer drive circuit in this utility model;

[0033] Figure 8 This is a circuit connection diagram of the three-color backlight driving circuit in this utility model. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] like Figure 1 As shown, an access control card reader with RCC communication function is provided, which mainly consists of MCU control circuit, RCC communication circuit, RS485 communication circuit, power supply circuit, radio frequency drive circuit, radio frequency antenna, buzzer drive circuit and three-color backlight drive circuit.

[0036] like Figure 3 As shown, the power supply circuit includes a step-down switching power supply chip U3. The step-down switching power supply chip U3 is an XC4216 DC-DC step-down switching power supply chip, which supports a maximum input of 40VDC and can provide 1A output current. The step-down output VCC of U3XC4216 is a 5VDC power supply. VCC is regulated by U1 UM37533 LDO chip to output 3.3VDC to provide the working voltage for other circuits.

[0037] Specifically: Pin 5 of the buck switching power supply chip U3 is electrically connected to the cathode of the Zener diode D2, and the anode of the Zener diode D2 is connected to a 12V DC voltage. Pin 5 of the buck switching power supply chip U3 is grounded through a parallel electrolytic capacitor E1 and a capacitor C56. A capacitor C38 is electrically connected between pins 1 and 6 of the buck switching power supply chip U3. An inductor L3, a capacitor C23, and a resistor R71 are electrically connected between pins 6 and 3 of the buck switching power supply chip U3. Among them, the capacitor C23 and the resistor R71 are connected in parallel and then connected in series with the inductor L3. The connection point between the inductor L3 and the capacitor C23 serves as the VCC output terminal. The VCC output terminal is grounded through an electrolytic capacitor C1 and a capacitor C60. Among them, the electrolytic capacitor C1 and the capacitor C60 are connected in parallel. Pin 3 of the buck switching power supply chip U3 is grounded through a resistor R72. The VCC output terminal is electrically connected to pin 1 of the voltage regulator chip U1. The VCC output terminal is electrically connected to pin 3 of the voltage regulator chip U1 through resistor R91. Pin 5 of the voltage regulator chip U1 serves as the V3.3 output terminal. The V3.3 output terminal is grounded through electrolytic capacitors C57 and C58, which are connected in parallel.

[0038] like Figure 2 As shown, the MCU control circuit includes control chip U2. Control chip U2 uses a domestically produced 32-bit RISC processor CH32V103C8T6, which is a RISC-V core MCU based on the RISC-V3A processor, with an 80MHz operating frequency, 64KB Flash storage space, and 20KB RAM.

[0039] like Figure 4 As shown, the RF drive circuit includes an RFID driver chip U11, which is a TSC9883. The TSC9883 is a highly integrated contactless reader chip operating at 13.56MHz, supporting contactless reader modes compliant with multiple ISO protocols. It features low voltage, low power consumption, and strong driving capability, making it suitable for contactless reader applications requiring low power consumption, low voltage, and low cost. Specifically: pin 31 of the RFID driver chip U11 is electrically connected to pin 14 of the control chip U2 via an SPI interface; pin 30 of the RFID driver chip U11 is electrically connected to pin 16 of the control chip U2 via an SPI interface; pin 29 of the RFID driver chip U11 is electrically connected to pin 15 of the control chip U2 via an SPI interface; and pin 21 of the RFID driver chip U11 is electrically connected to pin 18 of the control chip U2 via an SPI interface. Pins 12, 13, 14, 15, and 17 of the RFID driver chip U11 are electrically connected to the input terminal of the RF antenna circuit module.

[0040] The RF antenna adopts a PCB design. The PCB antenna and the metal chassis environment together form the RF resonant capacitor parameters, so that the RF signal of the card reader will not be affected by the external metal environment.

[0041] like Figure 5 As shown, the RCC communication circuit includes an RCC communication module P2. Pin 3 of the RCC communication module P2 is electrically connected to pin 21 of the control chip U2, and pin 4 of the RCC communication module P2 is electrically connected to pin 22 of the control chip U2. Using UART communication, the MCU sends polling commands periodically. When the mobile phone approaches the card reader, the RCC communication module P2 reads the physical card number of the mobile phone's SIM card and outputs it to the MCU via UART. The MCU then outputs the physical card number of the SIM card to the external access control controller via an RS485 communication circuit to unlock the door.

[0042] like Figure 6 As shown, the RS485 communication circuit includes an RS485 communication chip U8, which is an SP385. UART communication is used. The output of the RS485 communication chip U8 is connected to terminal P1 after passing through a protection circuit of Zener diodes D6 and D7 and resistors R2 and R3. Terminal P1 is connected to an external access control controller. Specifically: pin 1 of RS485 communication chip U8 is electrically connected to pin 31 of control chip U2; pins 2 and 3 of RS485 communication chip U8 are electrically connected and connected to pin 46 of control chip U2; pin 4 of RS485 communication chip U8 is electrically connected to pin 30 of control chip U2; pin 6 of RS485 communication chip U8 is electrically connected to one end of resistor R2; the other end of resistor R2 is electrically connected to pin 3 of terminal P1; pin 3 of terminal P1 is electrically connected to the cathode of Zener diode D6; the anode of Zener diode D6 is grounded; pin 7 of RS485 communication chip U8 is electrically connected to one end of resistor R3; the other end of resistor R3 is electrically connected to pin 4 of terminal P1; pin 4 of terminal P1 is electrically connected to the cathode of Zener diode D7; the anode of Zener diode D7 is grounded.

[0043] like Figure 7As shown, the buzzer driver circuit includes transistor Q7, which is an 8050 transistor. The base of transistor Q7 is electrically connected to pin 11 of control chip U2 through resistor R60. The emitter of transistor Q7 is grounded, and the collector of transistor Q7 is electrically connected to pin 2 of buzzer SPK1. Pin 1 of buzzer SPK1 is electrically connected to the VCC output of the power supply circuit. Diode D1 is electrically connected between pins 1 and 2 of buzzer SPK1. The MCU's I / O port drives transistor Q7 to control whether buzzer SPK1 sounds or not. That is, when pin 11 of U2 is high, transistor Q7 is turned on, and buzzer SPK1 sounds; when pin 11 of U2 is low, transistor Q7 is turned off, and buzzer SPK1 does not sound.

[0044] like Figure 8 As shown, the three-color backlight driving circuit includes transistors Q2, Q4, and Q10, all of which are 8550 transistors. The base of transistor Q2 is electrically connected to pin 33 of control chip U2 via resistor R52. The collector of transistor Q2 is grounded, and the emitter of transistor Q2 is electrically connected to pin 4 of terminal JP3 via resistor R7. The base of transistor Q4 is electrically connected to pin 32 of control chip U2 via resistor R56. The collector of transistor Q4 is grounded, and the emitter of transistor Q4 is electrically connected to pin 3 of terminal JP3 via resistor R8. The base of transistor Q10 is electrically connected to pin 29 of control chip U2 via resistor R22. The collector of transistor Q10 is grounded, and the emitter of transistor Q10 is electrically connected to pin 2 of terminal JP3 via resistor R20.

[0045] The backlight is controlled by driving transistors Q2, Q4, and Q10 through the MCU's I / O ports to turn the red, green, and blue backlights on or off. Specifically: when pin 29 of U2 is low, transistor Q10 is on, and the blue backlight is on; when pin 29 of U2 is high, transistor Q10 is off, and the blue backlight is off. When pin 32 of U2 is low, transistor Q4 is on, and the green backlight is on; when pin 32 of U2 is high, transistor Q4 is off, and the green backlight is off. When pin 33 of U2 is low, transistor Q2 is on, and the red backlight is on; when pin 33 of U2 is high, transistor Q2 is off, and the red backlight is off.

[0046] It should be noted that the control processes involved in the MCU described above are not within the protection scope of this utility model. The algorithms and programs involved in the MCU control process are all existing technologies and are only used by those skilled in the art to understand the overall circuit application.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the shape, structure, and principle of this utility model without departing from its technical solution should be covered within the protection scope of this utility model.

Claims

1. A door access card reader with RCC communication function, characterized in that, Includes MCU control circuit, RCC communication circuit and RS485 communication circuit; The MCU control circuit includes a control chip U2; The RCC communication circuit includes an RCC communication module P2, pin 3 of the RCC communication module P2 is electrically connected to pin 21 of the control chip U2, and pin 4 of the RCC communication module P2 is electrically connected to pin 22 of the control chip U2. The RS485 communication circuit includes an RS485 communication chip U8. Pin 1 of the RS485 communication chip U8 is electrically connected to pin 31 of the control chip U2. Pins 2 and 3 of the RS485 communication chip U8 are electrically connected to pin 46 of the control chip U2. Pin 4 of the RS485 communication chip U8 is electrically connected to pin 30 of the control chip U2. Pin 6 of the RS485 communication chip U8 is electrically connected to pin 3 of terminal P1 through resistor R2 and Zener diode D6. Pin 7 of the RS485 communication chip U8 is electrically connected to pin 4 of terminal P1 through resistor R3 and Zener diode D7.

2. The access control card reader with RCC communication function as described in claim 1, characterized in that, Pin 6 of the RS485 communication chip U8 is electrically connected to one end of resistor R2, and the other end of resistor R2 is electrically connected to pin 3 of terminal P1. Pin 3 of terminal P1 is electrically connected to the cathode of Zener diode D6, and the anode of Zener diode D6 is grounded. Pin 7 of the RS485 communication chip U8 is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to pin 4 of terminal P1. Pin 4 of terminal P1 is electrically connected to the cathode of Zener diode D7, and the anode of Zener diode D7 is grounded.

3. The access control card reader with RCC communication function as described in claim 1, characterized in that, It also includes a power supply circuit, which includes a step-down switching power supply chip U3. Pin 5 of the step-down switching power supply chip U3 is electrically connected to the cathode of a Zener diode D2, and the anode of the Zener diode D2 is connected to a 12V DC voltage. Pin 5 of the step-down switching power supply chip U3 is grounded through a parallel electrolytic capacitor E1 and a capacitor C56. A capacitor C38 is electrically connected between pins 1 and 6 of the step-down switching power supply chip U3. An inductor L3, a capacitor C23, and a resistor R71 are electrically connected between pins 6 and 3 of the step-down switching power supply chip U3. The capacitor C23 and the resistor R71 are connected in parallel and then in series with the inductor L3. The connection point between the inductor L3 and the capacitor C23 serves as the VCC output terminal. The VCC output terminal is grounded through an electrolytic capacitor C1 and a capacitor C60, which are connected in parallel. Pin 3 of the step-down switching power supply chip U3 is grounded through a resistor R72.

4. The access control card reader with RCC communication function as described in claim 3, characterized in that, The VCC output terminal is electrically connected to pin 1 of the voltage regulator chip U1. The VCC output terminal is electrically connected to pin 3 of the voltage regulator chip U1 through resistor R91. Pin 5 of the voltage regulator chip U1 serves as the V3.3 output terminal. The V3.3 output terminal is grounded through electrolytic capacitor C57 and capacitor C58, wherein electrolytic capacitor C57 and capacitor C58 are connected in parallel.

5. An access control card reader with RCC communication function as described in claim 1, characterized in that, The MCU control circuit is electrically connected to the radio frequency drive circuit. The radio frequency drive circuit includes an RFID driver chip U11. Pin 31 of the RFID driver chip U11 is electrically connected to pin 14 of the control chip U2. Pin 30 of the RFID driver chip U11 is electrically connected to pin 16 of the control chip U2. Pin 29 of the RFID driver chip U11 is electrically connected to pin 15 of the control chip U2. Pin 21 of the RFID driver chip U11 is electrically connected to pin 18 of the control chip U2.

6. An access control card reader with RCC communication function as described in claim 5, characterized in that, The radio frequency drive circuit is electrically connected to the radio frequency antenna.

7. An access control card reader with RCC communication function as described in claim 1, characterized in that, The MCU control circuit is electrically connected to the buzzer driver circuit. The buzzer driver circuit includes a transistor Q7. The base of the transistor Q7 is electrically connected to pin 11 of the control chip U2 through a resistor R60. The emitter of the transistor Q7 is grounded. The collector of the transistor Q7 is electrically connected to pin 2 of the buzzer SPK1. Pin 1 of the buzzer SPK1 is electrically connected to the VCC output terminal of the power supply circuit. A diode D1 is electrically connected between pin 1 and pin 2 of the buzzer SPK1.

8. An access control card reader with RCC communication function as described in claim 1, characterized in that, The MCU control circuit is electrically connected to the three-color backlight driving circuit, which includes transistors Q2, Q4, and Q10. The base of transistor Q2 is electrically connected to pin 33 of control chip U2 through resistor R52, the collector of transistor Q2 is grounded, and the emitter of transistor Q2 is electrically connected to pin 4 of terminal JP3 through resistor R7. The base of transistor Q4 is electrically connected to pin 32 of control chip U2 through resistor R56, the collector of transistor Q4 is grounded, and the emitter of transistor Q4 is electrically connected to pin 3 of terminal JP3 through resistor R8. The base of transistor Q10 is electrically connected to pin 29 of control chip U2 through resistor R22, the collector of transistor Q10 is grounded, and the emitter of transistor Q10 is electrically connected to pin 2 of terminal JP3 through resistor R20.

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