4G terminal connecting plate

Abstract

The invention relates to a 4G terminal connecting plate, and belongs to the technical field of communication, and the 4G terminal connecting plate comprises a plate body; the 4G module is integrated on the board body; the power supply module is integrated on the board body, is in communication connection with the 4G module and is used for supplying power to the 4G module; the startup module is integrated on the board body, is in communication connection with the 4G module and is used for starting up the 4G module; the SIM card module is integrated on the board body, is in communication connection with the 4G module and is used for sending and receiving data; and the serial port communication module is integrated on the board body, is in communication connection with the 4G module, and can communicate with an external single-chip microcomputer. The 4G module is adopted to replace Bluetooth transmission, so that the data transmission distance is increased, and the real-time performance, accuracy, safety and universality of data transmission are improved.

Description

Technical Field

[0001] The present application relates to the technical field of communications, and in particular to a 4G terminal connection board. Background Art

[0002] With the rapid development of measurement technology, measurement robots, as high-precision measuring instruments, are widely used in engineering construction, cadastral surveying, mining surveying and other fields.

[0003] In related technologies, most surveying robots use Bluetooth transmission technology for data transmission and remote control. The maximum transmission distance of traditional Bluetooth transmission technology in open areas is usually no more than 100 meters, and in environments with obstacles such as buildings and trees, the transmission distance will be further shortened. This is a significant limitation for surveying robots that need to be used in complex terrain and single-person long-distance stakeout. At the same time, when Bluetooth transmission encounters obstacles or electromagnetic interference, the signal is easily affected, resulting in data transmission interruption or data loss, which will seriously affect the real-time, accuracy, security and versatility of the measurement data, especially in application scenarios that require continuous monitoring and recording of data. Summary of the invention

[0004] In order to improve the distance of data transmission and the real-time, accuracy, security and versatility of data transmission, the present application provides a 4G terminal connection board, which adopts the following technical solutions: A 4G terminal connection board, comprising: plate body; A 4G module is integrated on the board; A power supply module, integrated on the board, connected to the 4G module for communication, and used to supply power to the 4G module; A power-on module, integrated on the board, connected to the 4G module for communication, and used to power on the 4G module; A SIM card module, integrated on the board, is connected to the 4G module for communication and is used to send and receive data; The serial communication module is integrated on the board, is connected to the 4G module for communication, and can communicate with an external single-chip microcomputer.

[0005] By adopting the above technical solution, after the power supply module supplies power to the 4G module, the power-on module powers on the 4G module; after the 4G module is normally powered on, the external single-chip microcomputer detects whether a SIM card exists. When the SIM card exists, the connection parameters of the 4G module are configured through the serial communication module using AT commands. After the configuration is completed, the 4G module is connected to the designated server and interacts with the designated server for data; since the 4G module is used to replace Bluetooth transmission, the data transmission distance as well as the real-time, accuracy, security and versatility of data transmission are improved.

[0006] Optionally, the 4G terminal connection board also includes: The AES encryption module is integrated on the board and is used to encrypt the data to be sent by the 4G module.

[0007] By adopting the above technical solution and the AES encryption protocol, data is encrypted to achieve end-to-end encrypted communication, ensuring the security of data during transmission and preventing unauthorized access and data leakage.

[0008] Optionally, the 4G terminal connection board also includes: The onboard antenna module is integrated on the board and connected to the 4G module.

[0009] By adopting the above technical solutions, the receiving and transmitting capabilities of 4G signals can be enhanced, the signal coverage range can be expanded, and the stability and reliability of communications can be improved.

[0010] Optionally, the SIM card module includes: SIM card, the board body is provided with a card slot, the SIM card can be inserted into and fixed in the card slot, and the GND pin of the SIM card is grounded; A first resistor R1, one end of which is connected to the 4G module, and the other end of which is connected to the DATA pin of the SIM card; A second resistor R2, one end of which is connected to the 4G module, and the other end of which is connected to the RST pin of the SIM card; A third resistor R3, one end of which is connected to the 4G module, and the other end of which is connected to the CLK pin of the SIM card; a fourth resistor R4, one end of which is connected to the VCC pin of the SIM card, and the other end of which is connected to the other end of the first resistor R1; A first capacitor C1, one end of which is connected to the other end of the first resistor R1, and the other end of which is grounded; A second capacitor C2, one end of which is connected to the other end of the second resistor R2, and the other end of which is grounded; A third capacitor C3, one end of which is connected to the other end of the third resistor R3, and the other end of which is grounded; A fourth capacitor C4, one end of which is connected to the VCC pin of the SIM card, and the other end of which is grounded; The fifth capacitor C5 has one end connected to one end of the fourth capacitor C4 and the 4G module, and the other end grounded.

[0011] By adopting the above technical solution, the VCC pin of the SIM card provides power for the SIM card, the RST pin is a reset pin, the CLK pin is a clock signal for synchronous data transmission, and the DATA pin is a data line port for sending and receiving data; the first resistor R1, the second resistor R2 and the third resistor R3 are current limiting resistors, which are used to protect the data, reset and clock pins of the SIM card respectively to prevent excessive current from damaging the SIM card or other circuit components; the fourth resistor R4 is a pull-up resistor to ensure that the CLK pin of the SIM card is maintained at a high level when there is no signal to prevent floating; the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are decoupling capacitors, which are used to filter out high-frequency noise on the signal line to ensure that the signal is stably transmitted to the 4G module to stabilize the signal; the fifth capacitor C5 is a decoupling capacitor, which is used to filter out high-frequency noise on the power line connected to the VCC pin to provide a stable power supply voltage; After the SIM card is inserted, the power supply supplies power to the SIM card through the VCC pin; the GND pin on the SIM is connected to the ground wire to form a complete power supply loop; the second resistor R2 connects the reset signal to the RST pin of the SIM card; the clock signal reaches the CLK pin of the SIM card through the third resistor R3 to ensure that the data is transmitted and received at the correct timing; the data signal is connected to the DATA pin of the SIM card through the first resistor R1.

[0012] Optionally, the startup module includes: A fifth resistor R5, one end of which is connected to the input signal PWRKEY; a sixth resistor R6, one end of which is connected to the other end of the fifth resistor R5, and the other end of which is grounded; The first transistor Q1 has a base connected to the other end of the fifth resistor R5, an emitter connected to the ground, and a collector connected to the 4G module.

[0013] By adopting the above technical solution, the fifth resistor R5 is a current limiting resistor, which is used to limit the current flowing through the base of the first transistor Q1 to prevent the first transistor Q1 from being damaged by excessive current; the sixth resistor R6 is a pull-down resistor, which ensures that when there is no input signal, the base voltage of the first transistor Q1 is maintained at a low level to prevent the base from being suspended and causing malfunction; the first transistor Q1 is used for current amplification and switch control; when there is no input signal PWRKEY at the base, the fifth resistor R5 pulls the base down to the ground potential to ensure that the first transistor Q1 is in a cut-off state and the signal output by the collector is maintained at a high level; when there is an input signal PWRKEY at the base, PW The RKEY signal reaches the base of the first transistor Q1 through the fifth resistor R5, providing base current. As the base voltage increases and exceeds the turn-on threshold voltage, the first transistor Q1 starts to turn on; a path is formed between the collector and the emitter, the collector current begins to flow, and the signal output by the collector is pulled down to the ground potential (low level). In this state, the signal output by the collector can be used to start or reset the 4G module; when the PWRKEY signal stops inputting, the sixth resistor R6 pulls the base voltage down to the ground potential again, so that the base voltage is lower than the turn-on threshold voltage, the first transistor Q1 is cut off again, and the signal output by the collector returns to a high level.

[0014] Optionally, the power supply module includes: A buck converter U1, used to convert the input voltage into a 3.8V voltage used by the 4G module; A seventh resistor R7, one end of which is grounded; a sixth capacitor C6, one end of which is connected to the other end of the seventh resistor R7, and the other end of which is connected to the first input end of the buck converter U1; An eighth resistor R8, one end of which is grounded, and the other end of which is connected to the second input terminal of the buck converter U1; a seventh capacitor C7, one end of which is connected to the third input terminal of the buck converter U1, and the other end of which is grounded; an eighth capacitor C8, connected in parallel with the seventh capacitor C7; a ninth capacitor C9 connected in parallel with the eighth capacitor C8; a ninth resistor R9, one end of which is connected to the first output end of the buck converter U1, and the other end of which is connected to the third input end of the buck converter U1; a tenth capacitor C10, one end of which is connected to the second output end of the buck converter U1; A first inductor L1, one end of which is connected to the other end of the tenth capacitor C10 and to the third output end of the buck converter U1; a tenth resistor R10, one end of which is connected to the other end of the first inductor L1, and the other end of which is connected to the fourth input end of the buck converter U1; an eleventh resistor R11, one end of which is connected to the other end of the tenth resistor R10, and the other end of which is grounded; an eleventh capacitor C11, one end of which is connected to the other end of the first inductor L1, and the other end of which is grounded; A twelfth capacitor C12 is connected in parallel with the eleventh capacitor C11; A thirteenth capacitor C13 is connected in parallel with the twelfth capacitor C12; The transient voltage suppression diode D1 has a cathode connected to the other end of the first inductor L1 and a cathode grounded; the 4G module is connected to the cathode of the transient voltage suppression diode D1.

[0015] By adopting the above technical solution, the seventh resistor R7 and the eighth resistor R8 form a voltage divider for setting the feedback voltage of the buck converter U1; the sixth capacitor C6 and the seventh capacitor C7 are used for filtering and stabilizing the feedback loop; the eighth capacitor C8 and the ninth capacitor C9 are both input capacitors for filtering and smoothing the input voltage; the first inductor L1 is used to store energy and smooth the current in the buck converter U1; the transient voltage suppression diode D1 is used to protect the circuit from voltage spikes; the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 are all output capacitors, which help to filter and smooth the output voltage; The tenth resistor R10 and the eleventh resistor R11 are both feedback resistors, which are used to set the output voltage of the step-down conversion; the circuit converts a higher input voltage into a stable lower output voltage through the step-down converter U1, and the input voltage enters the step-down converter U1 after passing through the filter capacitor. The step-down converter U1 stores and releases energy through the first inductor L1, and smoothes the output voltage in combination with the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13, and adjusts and stabilizes the output through the feedback network (the tenth resistor R10 and the eleventh resistor R11), and the transient voltage suppression diode D1 protects the circuit from voltage spikes to ensure that the output voltage is stable and reliable.

[0016] Optionally, the serial port communication module includes: A bidirectional level converter U2, used to convert the low voltage signal of the 4G module into a high voltage signal of an external microcontroller; A fourteenth capacitor C14, one end of which is grounded, and the other end of which is respectively connected to the VCCA pin and the OE pin of the bidirectional level converter U2; the VCCA pin is connected to a low voltage, and the OE pin is an output enable pin; A fifteenth capacitor C15, one end of which is grounded, and the other end is connected to the VCCB pin of the bidirectional level converter U2; the VCCB pin outputs a high voltage; A twelfth resistor C12, one end of which is grounded, and the other end of which is connected to an I / O pin in the low voltage domain of the bidirectional level converter U2; A thirteenth resistor C13, one end of which is grounded, and the other end of which is connected to the I / O pin in the high voltage domain of the bidirectional level converter U2; The bidirectional level converter U2 further includes: A2 pin is connected to the transmitting end of the 4G module; B2 pin is connected to the receiving end of the external microcontroller; A1 pin is connected to the receiving end of the 4G module; A2 pin is connected to the transmitting end of the external microcontroller.

[0017] By adopting the above technical solution, the circuit power supply includes two different voltage domains: low voltage domain (VCCA, 1.8V) and high voltage domain (VCCB, 3.3V); the fourteenth capacitor C14 and the fifteenth capacitor C15 are decoupling capacitors for filtering power supply noise and ensuring the stability of power supply; the transmitting end signal of the 4G module is input to the A2 pin, and after level conversion, a high voltage signal is output from the B2 pin and connected to the receiving end of the single-chip microcomputer; the receiving end signal of the 4G module is input to the A1 pin, and after level conversion, a high voltage signal is output from the B1 pin and connected to the transmitting end of the single-chip microcomputer; when the OE pin is at a high level, the bidirectional level converter U2 works in normal mode and can perform bidirectional level conversion; when the OE pin is at a low level, all I / O pins are in a high-impedance state and the level conversion function is disabled; the twelfth resistor R12 and the thirteenth resistor R13 are used as pull-up resistors to ensure that when there is no input signal, the I / O pin is maintained at a high level to prevent floating and ensure the stability of the circuit. Through the reasonable connection of these components and power supplies, the bidirectional level conversion between the 4G module and the single-chip microcomputer can be realized, ensuring stable and reliable communication between different voltage domains.

[0018] Optionally, the 4G terminal connection board also includes: An extended carrying plate, wherein the plate body is provided with a receiving cavity, and the extended carrying plate is slidably connected in the receiving cavity; An expansion board is slidably connected to the expansion carrier board and is located on both sides of the expansion carrier board; each expansion board is provided with a plurality of expansion ports, and the expansion ports are connected to the idle pins on the board body; A first driving assembly, mounted on one side of the extension bearing plate, for driving the sliding movement of the extension plate on the same side; The second driving assembly is installed on the other side of the extended bearing plate and is used to drive the sliding of the extended plate on the same side.

[0019] By adopting the above technical solution, when the idle pins on the board are not in use, the expansion interface can be hidden inside the board; when in use, the first drive component and the second drive component can drive the corresponding expansion board to slide out of the board to facilitate connection with other devices, thereby improving the safety of the board and preventing the expansion port from being damaged in the external environment.

[0020] Optionally, the first driving component includes: The first telescopic rod comprises a first fixed rod, a first sliding rod, a first telescopic spring and a first driving ring; the first fixed rod is fixedly connected to the extended bearing plate, and the first telescopic spring is installed in the first fixed rod; the first sliding rod is coaxially slidably connected to the first fixed rod, and one end of the first sliding rod is connected to the first telescopic spring, and the other end is connected to the plate body; the first driving ring is coaxially fixedly connected to the first sliding rod; A first driving rack fixedly connected to the side wall of the expansion plate on the same side; A first driving gear, rotatably connected to the extension bearing plate and meshing with the first driving rack; A first drive pulley is coaxially fixedly connected to the first drive gear; A first driving main pulley, rotatably connected to the extension bearing plate, and drivingly connected to the first driving slave pulley via a belt; A first bevel gear, mounted on the extended bearing plate, and used for driving the first driving main pulley to rotate; The first active rack is fixedly connected to the first driving ring and meshes with the first bevel gear.

[0021] By adopting the above technical solution, when the driving plate body moves away from the extended supporting plate, as the plate body moves, the sliding rod drives the movement of the first driving rack, the first active rack drives the first bevel gear to move, the first bevel gear drives the rotation of the first driving main pulley, the first driving main pulley drives the rotation of the first driving slave pulley through the belt, thereby driving the rotation of the first driving gear, so that the first driving rack drives the expansion plate to move outside the plate body.

[0022] Optionally, the second driving component includes: The second telescopic rod comprises a second fixed rod, a second sliding rod, a second telescopic spring, a second driving ring and a pushing ring; the second fixed rod is fixedly connected to the extended bearing plate, and the second telescopic spring is installed in the second fixed rod; the second sliding rod is coaxially slidably connected to the second fixed rod, and one end of the second sliding rod is connected to the second telescopic spring, and the other end is connected to the plate body; the pushing ring is coaxially fixedly connected to the second sliding rod; the second driving ring is coaxially sleeved on the second sliding rod, and is slidably connected to the extended bearing plate; A second driving rack is fixedly connected to the side wall of the expansion plate on the same side; A second driving gear, rotatably connected to the extension bearing plate and meshing with the second driving rack; A second drive pulley is coaxially fixedly connected to the second drive gear; A second driving main pulley is rotatably connected to the extension bearing plate and is drivingly connected to the second driving slave pulley via a belt; A second bevel gear, mounted on the extended bearing plate, for driving the second driving main pulley to rotate; The second active rack is fixedly connected to the second driving ring, meshed with the second bevel gear, and slidably connected to the extension bearing plate.

[0023] By adopting the above technical solution, after the pushing ring abuts against the second driving ring, if the plate body continues to move, the second active rack will drive the rotation of the second bevel gear, thereby driving the rotation of the second driving main pulley, and the second driving main pulley drives the rotation of the second driving slave pulley through the belt, thereby driving the rotation of the second driving gear, so that the second driving rack drives the expansion plate on the same side to move out of the plate body; thereby realizing independent movement of the two expansion plates to meet the different requirements of users.

[0024] In summary, the present application has at least the following beneficial effects: 1. By integrating the 4G module, it ensures that data can be transmitted stably in a wide geographical range, and can ensure effective data transmission even under poor network conditions.

[0025] 2. By adopting the AES encryption protocol, the data is encrypted to achieve end-to-end encrypted communication, ensuring the security of data during transmission and preventing unauthorized access and data leakage.

[0026] 3. By using the onboard antenna module, the reception and transmission capabilities of 4G signals are enhanced, the signal coverage range is expanded, and the stability and reliability of communication are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of an embodiment of a connecting plate of the present application; Figure 2 This is a schematic diagram of the 4G module; Figure 3 This is the circuit diagram of the SIM card module Figure 4 This is the circuit diagram of the power-on module; Figure 5 This is the circuit diagram of the power supply module; Figure 6 This is the circuit diagram of the serial communication module; Figure 7 This is the schematic diagram of the AES encryption algorithm; Figure 8 It is a structural schematic diagram of another embodiment of the connection plate of the present application; Fig. 9 yes Figure 8 Exploded view of the middle connecting plate; Fig.10 It is a structural schematic diagram of the extended carrier board.

[0028] Description of reference numerals: 100, board body; 110, 4G module; 120, power supply module; 130, power-on module; 140, SIM card module; 150, serial communication module; 160, AES encryption module; 170, onboard antenna module; 200, extension carrier board; 210, extension board; 220, first drive assembly; 221, first telescopic rod; 2211, first drive ring; 222, first drive rack; 223, first drive gear; 224, first drive slave pulley; 225, first drive master pulley; 226, first bevel gear; 227, first active rack; 230, The second driving assembly; 231, the second telescopic rod; 2311, the second driving ring; 2312, the pushing ring; 232, the second driving rack; 233, the second driving gear; 234, the second driving pulley; 235, the second driving pulley; 236, the second bevel gear; 237, the second active rack; 301, the cooling pipe; 302, the water inlet pipe; 303, the water outlet pipe; 304, the valve; 310, the adjusting assembly; 311, the first adjusting gear; 312, the second adjusting gear; 313, the first adjusting rack; 314, the second adjusting rack; 315, the third adjusting rack; 316, the adjusting spring. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 -Attached Fig.10 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The embodiment of the present application discloses a 4G terminal connection board. The connection board uses a 4G module 110 as a core communication module, which is responsible for realizing wireless transmission of data through a cellular network. The connection board is equipped with an onboard antenna to improve the reception and transmission quality of the signal. The 4G module 110 is embedded with a variety of network protocol stacks, including but not limited to TCP / IP, HTTP, MQTT, etc. The integration of these protocols enables the connection board to adapt to different network environments and application requirements. Users can flexibly configure the connection parameters of the server for the 4G module 110 through the built-in AT command so that the 4G module 110 is connected to the specified server. In order to ensure the security of the data and prevent the data from being stolen and tampered with during the transmission process, the AES encryption algorithm is used to encrypt the data before it is sent, and the corresponding decryption algorithm is used on the server side to restore the original data. Due to the use of an end-to-end encryption mechanism, a secure data transmission environment is provided for users, thereby ensuring the security of data transmission.

[0031] In addition, the connection board can also lead out multiple pins, including but not limited to GPIO, I2C, SPI, etc., to facilitate users to expand and connect other devices as needed, greatly improving the applicability, flexibility and versatility of the connection board; users can quickly integrate the connection board with other devices according to their needs, thereby realizing customized solutions.

[0032] Reference Figure 1 As an implementation of a 4G terminal connection board, the 4G terminal connection board may include a board body 100, a 4G module 110, a power supply module 120, a power-on module 130, a SIM card module 140, a serial communication module 150, an AES encryption module 160 and an onboard antenna module 170.

[0033] Among them, the 4G module 110, the power supply module 120, the power module 130, the SIM card module 140, the serial communication module 150, the onboard antenna module 170 and the AES encryption module 160 are all integrated on the board 100. The power supply module 120, the power module 130, the SIM card module 140, the serial communication module 150, the onboard antenna module 170 and the AES encryption module 160 are all connected to the 4G module 110; in addition, the serial communication module 150 can also be connected to the external microcontroller to realize the two-way communication between the 4G module 110 and the microcontroller. The onboard antenna module 170 is an onboard antenna.

[0034] After the power supply module 120 supplies power to the 4G module 110, the power-on module 130 powers on the 4G module 110; after the 4G module 110 powers on normally, the external single-chip microcomputer detects whether a SIM card is present. When a SIM card is present, the connection parameters of the 4G module 110 are configured using AT instructions through the serial communication module 150. After the configuration is completed, the 4G module 110 connects to the designated server and interacts with the designated server for data; when the 4G module 110 sends data, the AES encryption module 160 encrypts the data.

[0035] Reference Figure 2 The 4G module 110 can use the EC20 chip, which supports a large number of network protocol stacks, including TCP / UDP / PPP / FTP / HTTP / NTP / PING and other protocols, adopts LTE 3GPP Rel.11 technology, supports a maximum downlink rate of 150Mbps and a maximum uplink rate of 50Mbps, and can be configured using AT commands through the serial port.

[0036] For example, when using AT commands to connect to the Alibaba Cloud server, the entire process is as follows: Send "AT" and receive "OK"; / / Initialization command Send "AT+CIMI" and receive "460"; / / SIM card is present Send "AT+COPS?" and receive "Mobile"; / / Query which operator the SIM card is registered to Send "AT+QMTDISC=0" and receive "OK"; / / Close the MQTT connection Send "AT+QMTCFG=aliauth,0,ProductKey,DeviceName,DeviceSecret" and receive "OK"; / / Enter Alibaba Cloud product triplet Send "AT+QMTOPEN=0,139.196.135.135,1883" and receive "+QMTOPEN:0,0"; / / Connect to MQTT Alibaba Cloud server via TCP Send "AT+QMTCONN=0,clientExample_1987" and receive "+QMTCONN:0,0,0"; / / Log in to the MQTT server Send "AT+QMTSUB=0,1,SubTopic" and receive "OK"; / / Subscribe to product SubTopic Send "AT+QMTPUBEX=0,0,0,0,PubTopic,data" and receive "OK"; / / Publish message data to the specified PubTopic In other implementations, the 4G module 110 may be replaced with a 4G module 110 of the same type.

[0037] Reference Figure 3 The SIM card module 140 includes a SIM card, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5.

[0038] The board 100 is provided with a card slot, into which the SIM card can be inserted and fixed. The SIM card includes a VCC pin, an RST pin, a CLK pin, a GND pin, a VPP pin and a DATA pin. The VPP pin is a programming voltage pin (usually unused and grounded), and the GND pin is grounded.

[0039] One end of the first resistor R1 is connected to the SIM_DATA pin in the 4G module 110, and the other end is connected to the DATA pin. One end of the second resistor R2 is connected to the SIM_RST pin in the 4G module 110, and the other end is connected to the RST pin. One end of the third resistor R3 is connected to the SIM_CLK pin in the 4G module 110, and the other end is connected to the CLK pin. The VCC pin is connected to the SIM_VDD pin in the 4G module 110 through a power line. One end of the fourth resistor R4 is connected to the VCC pin, and the other end is connected to the other end of the first resistor R1.

[0040] One end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end is grounded; one end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end is grounded; one end of the third capacitor C3 is connected to the other end of the third resistor R3, and the other end is grounded. One end of the fourth capacitor C4 and one end of the fifth capacitor C5 are both connected to the power line, and the other ends are both grounded.

[0041] In other embodiments, the SIM card circuit may be replaced with a circuit of the same type.

[0042] Reference Figure 4 The startup module 130 includes a fifth resistor R5, a sixth resistor R6 and a first transistor Q1.

[0043] Among them, one end of the fifth resistor R5 is connected to the input signal PWRKEY, and the other end is connected to the base of the first transistor Q1, and the first transistor Q1 is an NPN transistor. One end of the sixth resistor R6 is connected to the other end of the fifth resistor R5, and the other end is connected to the emitter of the first transistor Q1, and the emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to the PWRKEY_EC20 signal, and the PWRKEY_EC20 signal is used to start or reset the 4G module 110.

[0044] Reference Figure 5 The power supply module 120 includes a step-down converter U1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13 and a transient voltage suppression diode D1.

[0045] The buck converter U1 may use a RT7272B voltage conversion chip. Of course, in other implementations, other chips of the same type may also be used.

[0046] One end of the seventh resistor R7 is grounded, and the other end is connected to one end of the sixth capacitor C6. The other end of the sixth capacitor C6 is connected to the first input end of the buck converter U1, and the first input end is the COMP pin. One end of the eighth resistor R8 is grounded, and the other end is connected to the second input end of the buck converter U1, and the second input end is the RLIM pin. The seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are arranged in parallel, and one end of the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are all connected to the third input end of the buck converter U1, and the third input end is the VIN pin; the other end is grounded. One end of the ninth resistor R9 is connected to the first output end of the buck converter U1, and the other end is connected to VIN; the first output end is the EN pin. One end of the tenth capacitor C10 is connected to the second output end of the buck converter U1, and the other end is connected to one end of the first inductor L1. One end of the first inductor L1 is also connected to the third output end of the buck converter U1, and the second output end is the BOOT pin, and the third output end is the SW pin. The other end of the first inductor L1 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the fourth input terminal of the buck converter U1, and the fourth input terminal is the FB pin. One end of the eleventh resistor R11 is connected to the other end of the tenth resistor R10, and the other end is grounded. The eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 are connected in parallel, and one end is connected to the other end of the first inductor L1 and to the negative electrode of the transient voltage suppression diode D1, and the other end is grounded. The positive electrode of the transient voltage suppression diode D1 is grounded. The negative electrode of the transient voltage suppression diode D1 is also connected to the VBAT_VCC pin of the 4G module 110.

[0047] Reference Figure 6 The serial communication module 150 includes a bidirectional level converter U2, a fourteenth capacitor C14, a fifteenth capacitor C15, a twelfth resistor C12 and a thirteenth resistor C13.

[0048] The bidirectional level converter U2 may use a TXS0108EPWR chip. Of course, in other implementations, other chips of the same type may also be used.

[0049] The bidirectional level converter U2 includes a low-voltage power domain and a high-voltage power domain. The low-voltage power domain includes A1 pin, VCCA pin, A2 pin, A3 pin, A4 pin, A5 pin, A6 pin, A7 pin, A8 pin and OE pin. The high-voltage power domain includes B1 pin, VCCB pin, B2 pin, B3 pin, B4 pin, B5 pin, B6 pin, B7 pin, B8 pin and GND pin.

[0050] The A1 pin is the RXD pin, connected to the RXD pin of the receiving end in the 4G module 110. The VCCA pin is connected to the OE pin, the OE pin is the output enable pin, and the VCCA pin is connected to a low voltage (1.8V). The A2 pin is the TXD pin, connected to the TXD pin of the transmitting end in the 4G module 110. The B1 pin is the RXD_R pin, connected to the transmitting end of the external microcontroller; the B2 pin is the TXD_T pin, connected to the receiving end of the external microcontroller.

[0051] One end of the fourteenth capacitor C14 is grounded, and the other end is respectively connected to the VCCA pin and the OE pin of the bidirectional level converter U2. One end of the fifteenth capacitor C15 is grounded, and the other end is connected to the VCCB pin of the bidirectional level converter U2, and the VCCB pin outputs a high voltage (3.3V). One end of the twelfth resistor R12 is grounded, and the other end is connected to the A8 pin. One end of the thirteenth resistor R13 is grounded, and the other end is connected to the B8 pin.

[0052] The AES encryption algorithm is an encryption technology that uses symmetric keys. Its design goal is to provide a fast, secure and easy-to-implement encryption method. It implements data encryption through key expansion, initialization vectors, multiple rounds of byte substitution, row shift, column confusion and round key addition. The combination of these steps provides strong security and efficiency, making AES a widely used encryption standard. The security of AES mainly comes from its high diffusivity and obfuscation, as well as its complex S-box and key expansion algorithm. The specific process is as follows: Encryption process: C=E(K,A), where C is the encrypted ciphertext, K is the key, A is the plaintext, and E is the encryption function.

[0053] Decryption process: A=D(K,A), where D is the decryption function, and the decryption process is the inverse operation of the encryption process.

[0054] The AES encryption process is implemented through four steps: byte replacement, row shift, column confusion and round key addition, where byte replacement uses S-box to perform nonlinear transformation on each byte to increase the security of encryption; row shift is used to increase the diffusion of ciphertext by cyclically shifting the rows of the data block; column confusion is used to confuse each column of the data block through matrix multiplication to further increase the diffusion; round key addition performs XOR operation on the round key of the current round and the data block to integrate the confidentiality of the key into the data. The principle diagram of AES encryption algorithm is shown in the figure below. Figure 7 shown.

[0055] Reference Figure 8 and Fig. 9 As another implementation of the 4G terminal connection board, the 4G terminal connection board may further include an extension carrier board 200 , an extension board 210 , a first driving component 220 and a second driving component 230 .

[0056] An accommodating cavity is provided in the board body 100, and the extended carrier board 200 is slidably connected in the accommodating cavity along the thickness of the board body 100. The extended board 210 is horizontally slidably connected to the extended carrier board 200, and is located on both sides of the extended carrier board 200. Each extended board 210 is provided with a plurality of extended ports, and each extended port is connected to an idle pin on the board body 100. The first driving component 220 is installed on one side of the extended carrier board 200, and is disposed at both ends of the extended board 210 on the same side, for driving the sliding of the extended board 210 on the same side; the second driving component 230 is installed on the other side of the extended carrier board 200, and is disposed at both ends of the extended board 210 on the same side, for driving the sliding of the extended board 210 on the same side.

[0057] Reference Fig.10 The first driving assembly 220 includes a first telescopic rod 221, a first driving rack 222, a first driving gear 223, a first driving slave pulley 224, a first driving master pulley 225, a first bevel gear 226 and a first active rack 227.

[0058] The first telescopic rod 221 includes a first fixed rod, a first sliding rod, a first telescopic spring and a first driving ring 2211. The first fixed rod is fixedly connected to the extended bearing plate 200, the first telescopic spring is installed in the first fixed rod, the first sliding rod is coaxially slidably connected in the first fixed rod, and one end is abutted against the first telescopic spring, and the other end is fixedly connected to the plate body 100. The first driving ring 2211 is coaxially fixedly connected to the first sliding rod. The first driving rack 222 is fixedly connected to the side wall of the same side extension plate 210, the first driving gear 223 is meshed with the first driving rack 222, and is rotatably connected to the extended bearing plate 200. The first driving slave pulley 224 is coaxially fixedly connected to the first driving gear 223, the first driving main pulley 225 is rotatably connected to the extended bearing plate 200, and is connected to the first driving slave pulley 224 through a belt. The first bevel gear 226 is installed on the extended bearing plate 200, and is used to drive the rotation of the first driving main pulley 225. The first active rack 227 is fixedly connected to the first driving ring 2211 and meshes with the first bevel gear 226 .

[0059] The second driving assembly 230 includes a second telescopic rod 231 , a second driving rack 232 , a second driving gear 233 , a second driving slave pulley 234 , a second driving master pulley 235 , a second bevel gear 236 and a second active rack 237 .

[0060] The second telescopic rod 231 includes a second fixed rod, a second sliding rod, a second telescopic spring, a second driving ring 2311 and a pushing ring 2312 .

[0061] The second fixed rod is fixedly connected to the extended bearing plate 200, the second telescopic spring is installed in the second fixed rod, the second sliding rod is coaxially slidably connected in the second fixed rod, one end of the second telescopic spring is abutted against the second telescopic spring, and the other end is fixedly connected to the plate body 100. The push ring 2312 is coaxially fixedly connected to the second sliding rod, and the second drive ring 2311 is coaxially sleeved on the second sliding rod.

[0062] The second driving rack 232 is fixedly connected to the side wall of the expansion plate 210 on the same side, and meshes with the second driving gear 233, and the second driving gear 233 is rotatably connected to the expansion carrier plate 200. The second driving slave pulley 234 is coaxially fixedly connected to the second driving gear 233, and the second driving master pulley 235 is rotatably connected to the expansion carrier plate 200, and is transmission-connected to the second driving slave pulley 234 through a belt. The second bevel gear 236 is mounted on the expansion carrier plate 200, and is used to drive the rotation of the second driving master pulley 235. The second active rack 237 is fixedly connected to the second driving ring 2311, meshes with the second bevel gear 236, and is slidably connected to the expansion carrier plate 200.

[0063] Further, refer to Fig. 9 and Fig.10 The 4G terminal connection plate also includes a cooling pipe 301, a water inlet pipe 302, a water outlet pipe 303, a valve 304 and a regulating component 310.

[0064] The cooling pipe 301 is a coil installed on the plate body 100; the water inlet pipe 302 and the water outlet pipe 303 are both connected to the cooling pipe 301 through the valve 304 to realize the circulation of the coolant in the cooling pipe 301. The regulating component 310 is used to adjust the opening degree of the valve 304 to adjust the flow of the coolant entering the cooling pipe 301. The water inlet pipe 302 and the water outlet pipe 303 between the valve 304 and the cooling pipe 301 are telescopic pipes.

[0065] The adjustment assembly 310 includes a first adjustment gear 311 , a second adjustment gear 312 , a first adjustment rack 313 , a second adjustment rack 314 , a third adjustment rack 315 and an adjustment spring 316 .

[0066] The first adjusting gear 311 is rotatably connected to the extension bearing plate 200 and meshes with a second driving rack 232. One end of the first adjusting rack 313 meshes with the first adjusting gear 311, and the second adjusting rack 314 is slidably connected with the other end of the first adjusting rack 313. The second adjusting rack 314 is slidably connected with the extension plate 210 corresponding to the second driving rack 232 through the adjusting groove; the adjusting spring 316 is installed in the adjusting groove, one end is fixedly connected to the inner wall of the adjusting groove, and the other end is abutted against the second adjusting rack 314. The second adjusting gear 312 is coaxially fixedly connected to the two valves 304, respectively, and the second adjusting rack 314 can mesh with the two second adjusting gears 312; one end of the third adjusting rack 315 is fixedly connected to the extension plate 210 corresponding to the first driving rack 222, and the other end is meshed with the two second adjusting racks 314. The purpose of the adjustment spring 316 is to ensure that the second adjustment rack 314 is engaged with the second adjustment gear 312 after the first adjustment rack 313 drives the second adjustment rack 314 to engage with the second adjustment gear 312 , corresponding to the continued movement of the expansion plate 210 .

[0067] When the board body 100 moves, it means that other devices need to be connected, so the power consumption of each module on the board body 100 may increase. Therefore, when one of the expansion boards 210 moves, the corresponding third adjustment rack 315 drives the two valves 304 to open further; when the other expansion board 210 also moves, the second drive rack 232 drives the first adjustment gear 311 to rotate, and the first adjustment gear 311 drives the first adjustment rack 313 to move, so that the second adjustment rack 314 is engaged with the second adjustment gear 312 to further open the valve 304. When the other expansion board 210 moves, the second adjustment rack 314 has been disengaged from the second adjustment gear 312, so the continued opening of the valve 304 will not affect the expansion board 210 that has moved into place. It should also be noted that when the other expansion board 210 moves, the first active rack 227 will be disengaged from the first bevel gear 226.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application in sequence. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. A 4G terminal connection board, characterized in that: include: Plate(100); A 4G module (110), integrated on the board (100); A power supply module (120), integrated on the board (100), communicatively connected to the 4G module (110), and used to supply power to the 4G module (110); A power-on module (130), integrated on the board (100), communicatively connected to the 4G module (110), and used for powering on the 4G module (110); A SIM card module (140), integrated on the board (100), communicatively connected to the 4G module (110), and used for sending and receiving data; The serial communication module (150) is integrated on the board (100), is communicatively connected to the 4G module (110), and is capable of communicating with an external single-chip microcomputer.

2. A 4G terminal connection board according to claim 1, characterized in that: The 4G terminal connection board also includes: An AES encryption module (160) is integrated on the board (100) and is used to encrypt data to be sent by the 4G module (110).

3. A 4G terminal connection board according to claim 2, characterized in that: The 4G terminal connection board also includes: An onboard antenna module (170) is integrated on the board body (100) and connected to the 4G module (110).

4. A 4G terminal connection board according to claim 3, characterized in that: The SIM card module (140) comprises: SIM card, the board (100) is provided with a card slot, the SIM card can be inserted into and fixed in the card slot, and the GND pin of the SIM card is grounded; A first resistor R1, one end of which is connected to the 4G module (110), and the other end of which is connected to a DATA pin of the SIM card; a second resistor R2, one end of which is connected to the 4G module (110), and the other end of which is connected to the RST pin of the SIM card; a third resistor R3, one end of which is connected to the 4G module (110), and the other end of which is connected to the CLK pin of the SIM card; a fourth resistor R4, one end of which is connected to the VCC pin of the SIM card, and the other end of which is connected to the other end of the first resistor R1; A first capacitor C1, one end of which is connected to the other end of the first resistor R1, and the other end of which is grounded; A second capacitor C2, one end of which is connected to the other end of the second resistor R2, and the other end of which is grounded; A third capacitor C3, one end of which is connected to the other end of the third resistor R3, and the other end of which is grounded; A fourth capacitor C4, one end of which is connected to the VCC pin of the SIM card, and the other end of which is grounded; A fifth capacitor C5 has one end connected to one end of the fourth capacitor C4 and to the 4G module (110), and the other end connected to the ground.

5. A 4G terminal connection board according to claim 3, characterized in that: The startup module (130) comprises: A fifth resistor R5, one end of which is connected to the input signal PWRKEY; a sixth resistor R6, one end of which is connected to the other end of the fifth resistor R5, and the other end of which is grounded; The first transistor Q1 has a base connected to the other end of the fifth resistor R5, an emitter connected to the ground, and a collector connected to the 4G module (110).

6. A 4G terminal connection board according to claim 3, characterized in that: The power supply module (120) comprises: A buck converter U1, used for converting an input voltage into a 3.8V voltage used by the 4G module (110); A seventh resistor R7, one end of which is grounded; a sixth capacitor C6, one end of which is connected to the other end of the seventh resistor R7, and the other end of which is connected to the first input end of the buck converter U1; An eighth resistor R8, one end of which is grounded, and the other end of which is connected to the second input end of the buck converter U1; a seventh capacitor C7, one end of which is connected to the third input terminal of the buck converter U1, and the other end of which is grounded; an eighth capacitor C8, connected in parallel with the seventh capacitor C7; a ninth capacitor C9 connected in parallel with the eighth capacitor C8; a ninth resistor R9, one end of which is connected to the first output end of the buck converter U1, and the other end of which is connected to the third input end of the buck converter U1; a tenth capacitor C10, one end of which is connected to the second output end of the buck converter U1; A first inductor L1, one end of which is connected to the other end of the tenth capacitor C10 and to the third output end of the buck converter U1; a tenth resistor R10, one end of which is connected to the other end of the first inductor L1, and the other end of which is connected to the fourth input end of the buck converter U1; an eleventh resistor R11, one end of which is connected to the other end of the tenth resistor R10, and the other end of which is grounded; an eleventh capacitor C11, one end of which is connected to the other end of the first inductor L1, and the other end of which is grounded; A twelfth capacitor C12 is connected in parallel with the eleventh capacitor C11; A thirteenth capacitor C13 is connected in parallel with the twelfth capacitor C12; A transient voltage suppression diode D1 has a cathode connected to the other end of the first inductor L1 and a cathode grounded; the 4G module (110) is connected to the cathode of the transient voltage suppression diode D1.

7. A 4G terminal connection board according to claim 3, characterized in that: The serial communication module (150) comprises: A bidirectional level converter U2, used for converting a low voltage signal of the 4G module (110) into a high voltage signal of an external single chip microcomputer; A fourteenth capacitor C14, one end of which is grounded, and the other end of which is respectively connected to the VCCA pin and the OE pin of the bidirectional level converter U2; the VCCA pin is connected to a low voltage, and the OE pin is an output enable pin; A fifteenth capacitor C15, one end of which is grounded, and the other end is connected to the VCCB pin of the bidirectional level converter U2; the VCCB pin outputs a high voltage; A twelfth resistor C12, one end of which is grounded, and the other end of which is connected to an I / O pin in the low voltage domain of the bidirectional level converter U2; A thirteenth resistor C13, one end of which is grounded, and the other end of which is connected to the I / O pin in the high voltage domain of the bidirectional level converter U2; The bidirectional level converter U2 further includes: A2 pin, connected to the transmitting end of the 4G module (110); B2 pin is connected to the receiving end of the external microcontroller; A1 pin, connected to the receiving end of the 4G module (110); B1 pin is connected to the transmitting end of the external microcontroller.

8. A 4G terminal connection board according to any one of claims 1 to 7, characterized in that: The 4G terminal connection board also includes: An extended carrying plate (200), the plate body (100) being provided with a receiving cavity, the extended carrying plate (200) being slidably connected in the receiving cavity; An expansion board (210) is slidably connected to the expansion carrier board (200) and is located on both sides of the expansion carrier board (200); each expansion board (210) is provided with a plurality of expansion ports, and the expansion ports are connected to idle pins on the board body (100); A first driving assembly (220) is mounted on one side of the extended bearing plate (200) and is used to drive the extended plate (210) on the same side to slide; The second driving assembly (230) is installed on the other side of the extended bearing plate (200) and is used to drive the sliding movement of the extended plate (210) on the same side.

9. A 4G terminal connection board according to claim 8, characterized in that: The first driving component (220) comprises: The first telescopic rod (221) comprises a first fixed rod, a first sliding rod, a first telescopic spring and a first driving ring (2211); the first fixed rod is fixedly connected to the extended bearing plate (200), and the first telescopic spring is installed in the first fixed rod; the first sliding rod is coaxially slidably connected to the first fixed rod, one end of the first sliding rod is connected to the first telescopic spring, and the other end is connected to the plate body (100); the first driving ring (2211) is coaxially fixedly connected to the first sliding rod; A first driving rack (222) is fixedly connected to a side wall of the expansion plate (210) on the same side; A first driving gear (223) is rotatably connected to the extension bearing plate (200) and meshes with the first driving rack (222); A first drive pulley (224) is coaxially fixedly connected to the first drive gear (223); A first driving main pulley (225) is rotatably connected to the extended bearing plate (200) and is transmission-connected to the first driving slave pulley (224) via a belt; A first bevel gear (226) mounted on the extended bearing plate (200) and used to drive the first driving main pulley (225) to rotate; The first active rack (227) is fixedly connected to the first drive ring (2211) and meshes with the first bevel gear (226).

10. A 4G terminal connection board according to claim 8, characterized in that: The second driving component (230) comprises: The second telescopic rod (231) comprises a second fixed rod, a second sliding rod, a second telescopic spring, a second driving ring (2311) and a pushing ring (2312); the second fixed rod is fixedly connected to the extended bearing plate (200), and the second telescopic spring is installed in the second fixed rod; the second sliding rod is coaxially slidably connected to the second fixed rod, and one end is connected to the second telescopic spring, and the other end is connected to the plate body (100); the pushing ring (2312) is coaxially fixedly connected to the second sliding rod; the second driving ring (2311) is coaxially sleeved on the second sliding rod, and is slidably connected to the extended bearing plate (200); A second driving rack (232) is fixedly connected to a side wall of the expansion plate (210) on the same side; A second driving gear (233) is rotatably connected to the extension bearing plate (200) and meshes with the second driving rack (232); A second drive pulley (234) is coaxially fixedly connected to the second drive gear (233); A second driving main pulley (235) is rotatably connected to the extended bearing plate (200) and is transmission-connected to the second driving slave pulley (234) via a belt; A second bevel gear (236) is mounted on the extended bearing plate (200) and is used to drive the second driving main pulley (235) to rotate; The second active rack (237) is fixedly connected to the second drive ring (2311), meshed with the second bevel gear (236), and slidably connected to the extended bearing plate (200).

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