External Bluetooth expansion module and use method thereof

Abstract

The invention relates to an external Bluetooth expansion module and a use method thereof. The problems that in the prior art, an external Bluetooth module is single in function, and data transmission and connection are not flexible enough are solved. The Bluetooth module comprises an assembly box body, a control mainboard is arranged in the assembly box body, the control mainboard is connected with a power supply, one end of the assembly box body is provided with a plurality of connection ports connected with the control mainboard, two sides of the assembly box body are provided with Bluetooth gain antennas connected with the control mainboard, and the upper end of the assembly box body is provided with a plurality of transmission line assemblies connected with the control mainboard. And a storage bin for movable connection is arranged on the lower side of the transmission line assembly. Compared with the prior art, the system has the advantages that the system is rich in function and convenient to operate, provides diversified Bluetooth connection modes, is suitable for connection scenes of more file and signal transmission, provides diversified connection ports, can adapt to file and signal transmission among more terminal devices, is good in use flexibility and good in effect, and meets wider use scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic components, and in particular to an external Bluetooth expansion module and a use method thereof. Background Art

[0002] Bluetooth is a wireless communication technology standard used to allow fixed and mobile devices to exchange data over short distances to form a personal area network (PAN). It uses short-baud high-frequency (UHF) radio waves to communicate via the ISM band of 2.4 to 2.485GHz. It can link multiple devices to overcome problems such as synchronization and interference. Early versions of the Bluetooth protocol had no advantages over wired connections due to poor connection stability and slow transmission speed. Today, after years of iterative updates, the Bluetooth protocol has strong stability and high data bandwidth. However, Bluetooth also has many disadvantages, such as: it is impossible to connect multiple devices of the same type at the same time, it is impossible to uniformly manage multiple Bluetooth connections, and it is impossible to synchronously control multiple Bluetooth terminal devices through Bluetooth; in addition, many existing devices are connected through wired networks. If the network is disconnected, the connection between devices is easily interrupted, affecting the transmission of signals and files. Therefore, additional Bluetooth functions are provided through external Bluetooth module devices, but the existing external Bluetooth modules have single functions, data transmission and connection are not flexible enough, and are not convenient enough during use, making it difficult to meet the diverse terminal configuration requirements.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a Bluetooth extension device, a Bluetooth device and a Bluetooth extension system [CN201910236204.8], which includes a Bluetooth module, a USB interface and a controller, wherein the Bluetooth module is used to establish a Bluetooth connection with the Bluetooth device and send and receive data through the Bluetooth connection; the USB interface is used to connect a device with Bluetooth function, and under the control of the controller, the data sent by the Bluetooth device received by the Bluetooth module is transmitted to the device with Bluetooth function; the controller is used to obtain information of the device with Bluetooth function through the USB interface, and transmit the data received by the Bluetooth module to the device with Bluetooth function through the USB interface according to the information.

[0004] The above solution has solved to a certain extent the problem in the prior art that Bluetooth devices cannot connect to multiple devices of the same type at the same time and cannot uniformly manage multiple Bluetooth connections. However, the solution still has many shortcomings, such as: the Bluetooth module has a single function, data transmission and connection are not flexible enough, it is not convenient enough during use, and it is difficult to meet the diverse terminal configuration requirements. Summary of the invention

[0005] The object of the present invention is to provide an external Bluetooth expansion module in view of the above problems.

[0006] The object of the present invention is to provide a method for using an external Bluetooth expansion module in view of the above problems.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an external Bluetooth expansion module, including an assembly box body, a control mainboard is arranged in the assembly box body, the control mainboard is connected to a power supply, and a plurality of connection ports connected to the control mainboard are arranged at one end of the assembly box body, Bluetooth gain antennas connected to the control mainboard are arranged on both sides of the assembly box body, and a plurality of transmission line components connected to the control mainboard are arranged at the upper end of the assembly box body, and a storage bin for mobile connection is arranged at the lower side of the transmission line component.

[0008] In the above-mentioned external Bluetooth expansion module, the mobile connection storage compartment includes a Bluetooth module storage compartment, a connecting cable storage compartment is provided on one side of the Bluetooth module storage compartment, and a mobile Bluetooth connection module is stored in the Bluetooth module storage compartment, and a data connection cable is stored in the connecting cable storage compartment. The Bluetooth module storage compartment and the connecting cable storage compartment can be opened and closed by a transparent cover, and the transparent cover is correspondingly provided with a Bluetooth logo and a data cable logo. The transmission protocol of the mobile Bluetooth connection module is the Bluetooth 5.3 protocol, and the data cable connector of the data connection cable is any one or more combinations of USB-typeA, USB-typeC and micro-USB.

[0009] In the above-mentioned external Bluetooth expansion module, the connection port includes a USB-typeA port, a USB-typeC port and a micro-USB port, the USB-typeA port, the USB-typeC port and the micro-USB port are respectively connected to a Bluetooth connection line and a data transmission line, the Bluetooth connection line is connected to a first Bluetooth module arranged on a control mainboard, the data transmission line is connected to a data conduction module and a first data transmission branch line, the first data transmission branch line is connected to a data storage module arranged on the control mainboard, a switching switch for switching between Bluetooth mode and data transmission mode is provided on one side of the USB-typeA port, the USB-typeC port and the micro-USB port, and a status indicator light for displaying Bluetooth status and data transmission status is provided on the lower side of the USB-typeA port, the USB-typeC port and the micro-USB port.

[0010] In the above-mentioned external Bluetooth expansion module, the transmission line component 6 includes a plurality of storage cavities arranged at the upper end of the assembly box body, and direct data cables with USB-typeA interface, USB-typeC interface and micro-USB interface are respectively provided in the storage cavities. One end of the direct data cable with USB-typeA interface, USB-typeC interface and micro-USB interface is provided with a Bluetooth connection branch line and a data connection branch line, the Bluetooth connection branch line is connected to the second Bluetooth module, the data connection branch line is connected to the data conduction module through the second data conduction branch line, and the data connection branch line is connected to the above-mentioned data storage module through the second data transmission branch line, and a conversion switch for switching between direct connection mode and Bluetooth connection mode is provided on the direct data cable, and a mode display light is provided on the lower side of the conversion switch.

[0011] In the above-mentioned external Bluetooth expansion module, the Bluetooth gain antenna is rotatable, and the side wall of the assembly box is provided with a storage slot for inserting the Bluetooth gain antenna, and the gain antenna is respectively connected to the first Bluetooth module box and the second Bluetooth module through the control motherboard, and the transmission protocol of the first Bluetooth module box and the second Bluetooth module is the Bluetooth 5.3 transmission protocol.

[0012] In the above-mentioned external Bluetooth expansion module, the power supply includes a power plug port arranged on the back of the assembly box body, and a charging and power supply switching module is built in the power plug port. The charging and power supply switching module is connected to the control mainboard through the power supply line and is connected to the power supply through the charging circuit. The power supply is connected to the control mainboard for power supply. A mode switching switch connected to the charging and power supply switching module is provided on one side of the power plug port, and a power switch for controlling the opening and closing of the charging and power supply switching module is provided on the upper side of the power plug port.

[0013] According to the above-mentioned external Bluetooth expansion module, a method for using the external Bluetooth expansion module is provided, and the method comprises the following steps:

[0014] S1. Turn on the power switch and select the power supply mode;

[0015] S2. Select a connection mode according to the distance between terminal device A and terminal device B;

[0016] S3, perform Bluetooth pairing connection or data direct connection;

[0017] S4, data transmission and storage;

[0018] S5. After completion, turn off the power switch or choose to charge.

[0019] In the above-mentioned method for using an external Bluetooth expansion module, the power supply mode includes direct power supply and power supply by power supply. When directly powered, the power plug port is connected to an external power line to directly power the control mainboard; when powered by power supply, the power plug port does not need to be connected to an external power line, and the control mainboard is directly powered by the power supply; when charging, the mode switch is switched to charging mode, and the power plug port is connected to an external power line to charge the power supply battery.

[0020] In step S2, the distance connection method is:

[0021] ① When the distance between terminal device A and terminal device B is far: one of the devices is connected via a mobile Bluetooth connection module and the other device is connected to the connection port via a data connection cable;

[0022] ② When the distance between terminal device A and terminal device B is relatively close: one of the devices is connected via a direct data cable and the other device is connected to the connection port via a data connection cable.

[0023] In step S3, the Bluetooth pairing connection includes:

[0024] a. Bluetooth connection between terminal device A and terminal device B;

[0025] b. Direct data connection between terminal device A and terminal device B;

[0026] c. Data connection between terminal device A and data storage module;

[0027] d. Data connection between the terminal device B and the data storage module 21;

[0028] In step S4, data transmission includes:

[0029] a-1: Bluetooth data transmission between terminal device A and terminal device B;

[0030] b-2: Direct data transmission between terminal device A and terminal device B;

[0031] c-3: Data transmission between terminal device A and data storage module;

[0032] d-4: Data transmission between terminal device B and data storage module.

[0033] Compared with the existing technology, the advantages of the present invention are: rich functions, easy operation, providing a variety of Bluetooth connection methods, adopting wireless connection and wired direct connection methods and providing switches for data transfer and data direct transmission mode control, suitable for more file and signal transmission connection scenarios, providing a variety of connection ports, able to adapt to more file and signal transmission between terminal devices, good flexibility and effect, and meeting a wider range of usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the internal structure of the assembly box body in the present invention;

[0036] Figure 3 It is a schematic diagram of the upper end surface structure of the assembly box body in the present invention;

[0037] Figure 4 It is a schematic diagram of the structure of the direct data line in the present invention;

[0038] Figure 5 It is a local structure connection block diagram in the present invention;

[0039] In the figure: assembly box body 1, control motherboard 2, data storage module 21, power supply 3, power plug port 31, charging and power supply switching module 32, power supply line 33, mode switching switch 34, power switch 35, charging circuit 36, connection port 4, USB-typeA port 41, USB-typeC port 42, micro-USB port 43, Bluetooth connection line 44, data transmission line 45, first Bluetooth module 46, data transmission module 47, first data transmission branch line 48, switching switch 49, status indicator light 491, Bluetooth gain antenna 5, storage slot 51, transmission line assembly 6, storage cavity 61, direct data line 62, Bluetooth connection branch line 63, data connection branch line 64, second Bluetooth module 65, second data transmission branch line 66, second data transmission branch line 67, conversion switch 68, mode display light 69, mobile connection storage compartment 7, Bluetooth module storage compartment 71, connection line storage compartment 72, mobile Bluetooth connection module 73, data connection line 74, transparent cover 75. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1-5As shown, an external Bluetooth expansion module includes an assembly box body 1, a control mainboard 2 is arranged in the assembly box body 1, the control mainboard 2 is connected to a power supply 3, and one end of the assembly box body 1 is provided with a plurality of connection ports 4 connected to the control mainboard 2, both sides of the assembly box body 1 are provided with Bluetooth gain antennas 5 connected to the control mainboard 2, and the upper end of the assembly box body 1 is provided with a plurality of transmission line components 6 connected to the control mainboard 2, and the lower side of the transmission line component 6 is provided with a storage bin 7 for mobile connection.

[0042] Among them, the mobile connection storage compartment 7 includes a Bluetooth module storage compartment 71, a connecting line storage compartment 72 is provided on one side of the Bluetooth module storage compartment 71, and a mobile Bluetooth connection module 73 is stored in the Bluetooth module storage compartment 71, and a data connection line 74 is stored in the connecting line storage compartment 72. The Bluetooth module storage compartment 71 and the connecting line storage compartment 72 can be opened and closed by a transparent cover body 75, and the transparent cover body 75 is correspondingly provided with a Bluetooth logo and a data line logo. The transmission protocol of the mobile Bluetooth connection module 73 is the Bluetooth 5.3 protocol, and the data line connector of the data connection line 74 is any one or more combinations of USB-typeA, USB-typeC and micro-USB.

[0043] The mobile Bluetooth connection module 73 here can be used by mobile devices without Bluetooth function, and the data connection line 74 is used for connecting fixed devices without Bluetooth devices to perform wired connection and realize Bluetooth function and wired transmission function.

[0044] In detail, the connection port 4 includes a USB-typeA port 41, a USB-typeC port 42 and a micro-USB port 43, the USB-typeA port 41, the USB-typeC port 42 and the micro-USB port 43 are respectively connected to a Bluetooth connection line 44 and a data transmission line 45, the Bluetooth connection line 44 is connected to a first Bluetooth module 46 arranged on the control main board 2, the data transmission line 45 is connected to a data conduction module 47 and a first data transmission branch line 48, the first data transmission branch line 48 is connected to a data storage module 21 arranged on the control main board 2, a switching switch 49 for switching between Bluetooth mode and data transmission mode is provided on one side of the USB-typeA port 41, the USB-typeC port 42 and the micro-USB port 43, and a status indicator light 491 for displaying Bluetooth status and data transmission status is provided on the lower side of the USB-typeA port, the USB-typeC port 42 and the micro-USB port 43.

[0045] The USB-typeA port 41, the USB-typeC port 42 and the micro-USB port 43 provide a variety of connection ports for the terminal device. The Bluetooth mode and the data transmission mode can be switched by switching the switch 49. In the Bluetooth mode, it can be paired with other devices for transmission. In the data transmission mode, the files can be transferred to the data storage module 21 for transmission to other terminal devices.

[0046] Preferably, the transmission line assembly 6 includes a plurality of storage cavities 61 arranged at the upper end of the assembly box body 1, and direct data cables 62 with USB-typeA interface, USB-typeC interface and micro-USB interface are respectively provided in the storage cavity 61, and one end of the direct data cable 62 with USB-typeA interface, USB-typeC interface and micro-USB interface is provided with a Bluetooth connection branch line 63 and a data connection branch line 64, the Bluetooth connection branch line 63 is connected to the second Bluetooth module 65, the data connection branch line 64 is connected to the data conduction module 47 through the second data conduction branch line 66, and the data connection branch line 64 is connected to the above-mentioned data storage module 21 through the second data transmission branch line 67, and a conversion switch 68 for switching between the direct connection mode and the Bluetooth connection mode is provided on the direct data cable 62, and a mode display light 69 is provided on the lower side of the conversion switch 68.

[0047] The direct data line 62 is used to connect the terminal device, and the conversion switch 68 is used to switch between the direct connection mode and the Bluetooth connection mode. In the direct connection mode, wired data transmission can be performed with the terminal device on the connection port 4, and the data can be transferred to the data storage module 21. In the Bluetooth connection mode, wireless data transmission can be performed with other terminal devices.

[0048] Furthermore, the Bluetooth boost antenna 5 is rotatable, and the side wall of the assembly box body 1 is provided with a storage slot 51 for inserting the Bluetooth boost antenna 5, and the boost antenna is respectively connected to the first Bluetooth module 46 and the second Bluetooth module 65 through the control motherboard 2, and the transmission protocol of the first Bluetooth module 46 and the second Bluetooth module 65 is the Bluetooth 5.3 transmission protocol.

[0049] The Bluetooth boost antenna 5 is mainly used to enhance the signal transmission and reception strength of the first Bluetooth module 46 and the second Bluetooth module 65 .

[0050] Specifically, the power supply 3 includes a power plug port 31 arranged on the back of the assembly box body 1, and a charging and power supply switching module 32 is built in the power plug port 31. The charging and power supply switching module 32 is connected to the control motherboard 2 through a power supply line 33 and is connected to the power supply 3 through a charging circuit 36. The power supply 3 is connected to the control motherboard 2 for power supply. A mode switching switch 34 connected to the charging and power supply switching module 32 is provided on one side of the power plug port 31, and a power switch 35 for controlling the opening and closing of the charging and power supply switching module 32 is provided on the upper side of the power plug port 31.

[0051] Not only can it be powered by a direct power connection, but it can also be powered by its own power supply 3. When the power plug port 31 is powered off, the power supply 3 is automatically connected to supply power to ensure that the power outage does not affect file transfer, and the power supply 3 can be charged.

[0052] A method for using an external Bluetooth expansion module, the method comprising the following steps:

[0053] S1, turn on the power switch 35 and select the power supply mode;

[0054] S2. Select a connection mode according to the distance between terminal device A and terminal device B;

[0055] S3, perform Bluetooth pairing connection or data direct connection;

[0056] S4, data transmission and storage;

[0057] S5. After completion, turn off the power switch 35 or select charging.

[0058] The power supply modes include direct power supply and power supply by power supply. When directly powered, the power plug port 31 is connected to an external power line to directly power the control mainboard 2; when powered by power supply, the power plug port 31 does not need to be connected to an external power line, and directly powers the control mainboard 2 through the power supply; when charging, the mode switching switch 34 is used to switch to the charging mode, and the power plug port 31 is used to connect an external power line to charge the power supply battery.

[0059] In step S2, the distance connection method is:

[0060] ① When the distance between terminal device A and terminal device B is far: one of the devices is connected via the mobile Bluetooth connection module 73 and the other device is connected to the connection port 4 via the data connection line 74;

[0061] ② When the distance between terminal device A and terminal device B is relatively close: one of the devices is connected via a direct data line 62 and the other device is connected to the connection port 4 via a data connection line 74 .

[0062] In step S3, the Bluetooth pairing connection includes:

[0063] a. Bluetooth connection between terminal device A and terminal device B;

[0064] b. Direct data connection between terminal device A and terminal device B;

[0065] c. Data connection between the terminal device A and the data storage module 21;

[0066] d. Data connection between the terminal device B and the data storage module 21;

[0067] In step S4, data transmission includes:

[0068] a-1: Bluetooth data transmission between terminal device A and terminal device B;

[0069] b-2: Direct data transmission between terminal device A and terminal device B;

[0070] c-3: Data transmission between the terminal device A and the data storage module 21;

[0071] d-4: Data transmission between the terminal device B and the data storage module 21.

[0072] In summary, the principle of this embodiment is that the assembly box body 1 provides a USB-type A port 41, a USB-type C port 42, and a micro-USB port 43 for connecting to an external fixed terminal device A. The Bluetooth mode and the data transmission mode can be switched by switching the switch 49. In the Bluetooth mode, files can be paired with other devices to transfer files. In the data transmission mode, files can be transferred to the data storage module 21 for transmission to other terminal devices. At the same time, when another terminal device B is a fixed device, it is connected through a direct data cable 62, and the Bluetooth connection mode and the data connection mode are switched by the conversion switch 68. In the Bluetooth connection mode, the terminal Device A and terminal device B perform Bluetooth pairing to achieve wireless data and signal transmission. In data connection mode, terminal device B can transfer files to the data storage module 21. When terminal device A and terminal device B are both switched to data connection mode, data and signal transmission can be performed between terminal device A and terminal device B through a wired connection. When terminal device B is a mobile device, the Bluetooth function is configured by taking out the mobile Bluetooth connection module 73 to perform a wireless Bluetooth connection with terminal device A. At the same time, the connection function can be configured for two fixed devices and one mobile device through the connection port 4, the direct data cable 62 and the mobile Bluetooth connection module 73, and files and signals can be transmitted between them.

[0073] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0074] Although this article uses more assembly box 1, control main board 2, data storage module 21, power supply 3, power plug port 31, charging and power supply switching module 32, power supply line 33, mode switching switch 34, power switch 35, charging circuit 36, connection port 4, USB-typeA port 41, USB-typeC port 42, micro-USB port 43, Bluetooth connection line 44, data transmission line 45, first Bluetooth module 46, data transmission module 47, first data transmission branch line 48, switching switch 49, status indicator light 491, Bluetooth boost antenna 5, storage slot 51, transmission line assembly 6, storage cavity 61, direct data line 62, Bluetooth connection branch line 63, data connection branch line 64, second Bluetooth module 65, second data transmission branch line 66, second data transmission branch line 67, conversion switch 68, mode display light 69, mobile connection storage compartment 7, Bluetooth module storage compartment 71, connection line storage compartment 72, mobile Bluetooth connection module 73, data connection line 74, transparent cover 75 and other terms, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An external Bluetooth expansion module, comprising an assembly box (1), wherein a control mainboard (2) is arranged in the assembly box (1), characterized in that: The control main board (2) is connected to a power supply (3), and one end of the assembly box body (1) is provided with a plurality of connection ports (4) connected to the control main board (2), both sides of the assembly box body (1) are provided with Bluetooth gain antennas (5) connected to the control main board (2), and the upper end of the assembly box body (1) is provided with a plurality of transmission line components (6) connected to the control main board (2), and the lower side of the transmission line component (6) is provided with a storage bin (7) for mobile connection.

2. The external Bluetooth expansion module according to claim 1, characterized in that: The mobile connection storage bin (7) comprises a Bluetooth module storage bin (71), a connection line storage bin (72) is provided on one side of the Bluetooth module storage bin (71), a mobile Bluetooth connection module (73) is stored in the Bluetooth module storage bin (71), a data connection line (74) is stored in the connection line storage bin (72), the Bluetooth module storage bin (71) and the connection line storage bin (72) can be opened and closed by a transparent cover (75), and a Bluetooth logo and a data line logo are correspondingly provided on the transparent cover (75), the transmission protocol of the mobile Bluetooth connection module (73) is the Bluetooth 5.3 protocol, and the data line connector of the data connection line (74) is any one or more combinations of USB-type A, USB-type C and micro-USB.

3. The external Bluetooth expansion module according to claim 1, characterized in that: The connection port (4) includes a USB-typeA port (41), a USB-typeC port (42) and a micro-USB port (43), wherein the USB-typeA port (41), the USB-typeC port (42) and the micro-USB port (43) are respectively connected to a Bluetooth connection line (44) and a data transmission line (45), wherein the Bluetooth connection line (44) is connected to a first Bluetooth module (46) provided on the control main board (2), and the data transmission line (45) is connected to a data transmission module (47) and a first A data transmission branch line (48), wherein the first data transmission branch line (48) is connected to a data storage module (21) arranged on a control main board (2), a switch (49) for switching between a Bluetooth mode and a data transmission mode is provided on one side of the USB-typeA port (41), the USB-typeC port (42) and the micro-USB port (43), and a status indicator light (491) for displaying a Bluetooth status and a data transmission status is provided on the lower side of the USB-typeA port, the USB-typeC port (42) and the micro-USB port (43).

4. The external Bluetooth expansion module according to claim 3, characterized in that: The transmission line assembly (6) comprises a plurality of storage cavities (61) arranged at the upper end of the assembly box body (1), wherein the storage cavities (61) are respectively provided with direct connection data cables (62) having a USB-typeA interface, a USB-typeC interface and a micro-USB interface, and one end of the direct connection data cables (62) having the USB-typeA interface, the USB-typeC interface and the micro-USB interface is provided with a Bluetooth connection branch line (63) and a data connection branch line (64), wherein the Bluetooth connection branch line (63) is connected to a second Bluetooth module (65), the data connection branch line (64) is connected to a data conduction module (47) via a second data conduction branch line (66), and the data connection branch line (64) is connected to the above-mentioned data storage module (21) via a second data transmission branch line (67), and the direct connection data cable (62) is provided with a conversion switch (68) for switching between a direct connection mode and a Bluetooth connection mode, and a mode display light (69) is provided at the lower side of the conversion switch (68).

5. The external Bluetooth expansion module according to claim 4, characterized in that: The Bluetooth boost antenna (5) is rotatable, and the side wall of the assembly box (1) is provided with a storage slot (51) for inserting the Bluetooth boost antenna (5), and the boost antenna is respectively connected to the first Bluetooth module (46) and the second Bluetooth module (65) through the control motherboard (2), and the transmission protocol of the first Bluetooth module (46) and the second Bluetooth module (65) is the Bluetooth 5.3 transmission protocol.

6. The external Bluetooth expansion module according to claim 1, characterized in that: The power supply (3) comprises a power plug port (31) arranged at the back of the assembly box body (1); the power plug port (31) has a built-in charging and power supply switching module (32); the charging and power supply switching module (32) is connected to the control mainboard (2) through a power supply line (33) and is connected to the power supply (3) through a charging circuit (36); the power supply (3) is connected to the control mainboard (2) for power supply; a mode switching switch (34) connected to the charging and power supply switching module (32) is provided on one side of the power plug port (31); and a power switch (35) for controlling the opening and closing of the charging and power supply switching module (32) is provided on the upper side of the power plug port (31).

7. A method for using an external Bluetooth expansion module according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1, turn on the power switch (35) and select the power supply mode; S2. Select a connection mode according to the distance between terminal device A and terminal device B; S3, perform Bluetooth pairing connection or data direct connection; S4, data transmission and storage; S5. After completion, turn off the power switch (35) or select charging.

8. The method for using an external Bluetooth expansion module according to claim 7, characterized in that: The power supply mode includes direct power supply and power supply by power supply, wherein in the case of direct power supply, the power plug port (31) is connected to an external power line to directly supply power to the control mainboard (2); in the case of power supply by power supply, the power plug port (31) does not need to be connected to an external power line, and the control mainboard (2) is directly supplied with power by the power supply; in the case of charging, the mode switching switch (34) is used to switch to the charging mode, and the power plug port (31) is connected to an external power line to charge the power supply battery.

9. The method for using an external Bluetooth expansion module according to claim 7, characterized in that: In step S2, the distance connection method is: ① When the distance between terminal device A and terminal device B is relatively far: one of the devices is connected via the mobile Bluetooth connection module (73) and the other device is connected to the connection port (4) via the data connection line (74); ② When the distance between terminal device A and terminal device B is relatively close: one of the devices is connected via a direct data line (62) and the other device is connected to the connection port (4) via a data connection line (74).

10. The method for using an external Bluetooth expansion module according to claim 9, characterized in that: In step S3, the Bluetooth pairing connection includes: a. Bluetooth connection between terminal device A and terminal device B; b. Direct data connection between terminal device A and terminal device B; c. Data connection between the terminal device A and the data storage module (21); d. data connection between the terminal device B and the data storage module (21); In step S4, the data transmission includes: a-1: Bluetooth data transmission between terminal device A and terminal device B; b-2: Direct data transmission between terminal device A and terminal device B; c-3: Data transmission between the terminal device A and the data storage module (21); d-4: Data transmission between the terminal device B and the data storage module (21).

Images