Multi-interface charging line and multi-interface charging system

Abstract

The utility model provides a multi-interface charging line and a multi-interface charging system. The multi-interface charging line comprises a first switch unit, a second switch unit, a third switch unit, a power supply unit, a protocol unit, a voltage detection unit, a first interface, a second interface, a third interface and a fourth interface. The power supply unit is electrically connected with the first switch unit, the second switch unit, the third switch unit, the protocol unit, the fourth interface and the voltage detection unit. The protocol unit is electrically connected with the first switch unit, the second switch unit, the third switch unit, the voltage detection unit, the first interface, the second interface and the fourth interface. The first switch unit is electrically connected with the first interface, the second switch unit is electrically connected with the second interface, and the third interface is electrically connected with the third switch unit and the voltage detection unit. According to the multi-interface charging line, when the third interface is not connected to the third device, the power of the power supply device is all distributed to the first interface and the second interface, and the charging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of multi-interface charging, and particularly relates to a multi-interface charging wire and a multi-interface charging system. BACKGROUND

[0002] With the development of artificial intelligence, intelligent electronic devices are increasingly popular. Current electronic devices have various charging interfaces, such as a USB-B interface, a USB-C interface, a Lightning interface, and the like. In order to charge devices with these interfaces, various multi-interface charging wires have appeared on the market, typical of which are one-to-two charging wires (one input interface and two output interfaces) and one-to-three charging wires (one input interface and three output interfaces). The existing multi-interface charging wire (one-to-three charging wire) mainly comprises a first interface, a second interface, a third interface, a fourth interface, a first switch unit, a second switch unit, a first power supply module, a second power supply module, and a protocol unit. However, since it is unable to determine whether the third interface is connected to a third device, the protocol unit needs to fixedly reserve a part of power for the third interface, and therefore the total power of the first interface and the second interface can only be the power of the power supply device minus the power reserved for the third interface. In the case where the third interface is not connected to the third device, the reserved power is not fully utilized, resulting in low charging efficiency of the first interface and the second interface. CONTENT OF THE UTILITY MODEL

[0003] The application embodiment provides a multi-interface charging wire and a multi-interface charging system, which can solve the problem that the reserved power is not fully utilized in the case where the third interface is not connected to the third device, resulting in low charging efficiency of the first interface and the second interface.

[0004] In a first aspect, the application embodiment provides a multi-interface charging wire, comprising a first switch unit, a second switch unit, a third switch unit, a power supply unit, a protocol unit, a voltage detection unit, a first interface, a second interface, a third interface, and a fourth interface.

[0005] The power supply unit is electrically connected with the first switch unit, the second switch unit, the third switch unit, the protocol unit, the fourth interface and the voltage detection unit respectively, the protocol unit is electrically connected with the first switch unit, the second switch unit, the third switch unit, the voltage detection unit, the first interface, the second interface and the fourth interface respectively, the first switch unit is electrically connected with the first interface, the second switch unit is electrically connected with the second interface, the third interface is electrically connected with the third switch unit and the voltage detection unit respectively, the first interface is used for being electrically connected with a first device, the second interface is used for being electrically connected with a second device, the third interface is used for being electrically connected with a third device, and the fourth interface is used for being electrically connected with a power supply device.

[0006] In a possible implementation manner of the first aspect, the first switch unit comprises a first switch, a first end of the first switch is electrically connected with the fourth interface, the power supply unit, the second switch unit and the third switch unit respectively, a second end of the first switch is electrically connected with the first interface, and a control end of the first switch is electrically connected with the protocol unit.

[0007] In a possible implementation manner of the first aspect, the second switch unit comprises a second switch, a first end of the second switch is electrically connected with the fourth interface, the power supply unit, the first switch unit and the third switch unit respectively, a second end of the second switch is electrically connected with the second interface, and a control end of the second switch is electrically connected with the protocol unit.

[0008] In a possible implementation manner of the first aspect, the third switch unit comprises a third switch, a first end of the third switch is electrically connected with the fourth interface, the power supply unit, the first switch unit and the second switch unit respectively, a second end of the third switch is electrically connected with the third interface, and a control end of the third switch is electrically connected with the protocol unit.

[0009] In a possible implementation manner of the first aspect, the power supply unit comprises a voltage transformer, and the voltage transformer is electrically connected with the first switch unit, the second switch unit, the third switch unit, the protocol unit, the fourth interface and the voltage detection unit respectively.

[0010] In a possible implementation manner of the first aspect, the protocol unit comprises a controller chip, and the controller chip is electrically connected with the first switch unit, the second switch unit, the third switch unit, the power supply unit, the voltage detection unit, the first interface, the second interface and the fourth interface respectively.

[0011] In a possible implementation manner of the first aspect, the voltage detection unit comprises a first resistor and a first diode, a first end of the first resistor is electrically connected with the power supply unit, a second end of the first resistor is electrically connected with an anode of the first diode and the protocol unit respectively, and a cathode of the first diode is electrically connected with the third interface and the third device respectively.

[0012] In a possible implementation manner of the first aspect, the first interface and the fourth interface are USB-C interfaces, and the second interface is a USB-C interface or a Lightning interface, and the third interface is a USB-B interface.

[0013] In a possible implementation manner of the first aspect, the multi-interface charging line further comprises a current sampling unit, the current sampling unit is electrically connected with the protocol unit and the third interface respectively, and the current sampling unit is configured to sample a first current output by the third interface and transmit the first current to the protocol unit.

[0014] In the second aspect, the embodiments of the present application provide a multi-interface charging system, comprising a power supply device, a first device, a second device, a third device and the multi-interface charging line of any one of the first aspect, the power supply device is electrically connected with the fourth interface of the multi-interface charging line, the first device is electrically connected with the first interface of the multi-interface charging line, the second device is electrically connected with the second interface of the multi-interface charging line, and the third device is electrically connected with the third interface of the multi-interface charging line.

[0015] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0016] The multi-interface charging line provided in the embodiments of the present application comprises a first switch unit, a second switch unit, a third switch unit, a power supply unit, a protocol unit, a voltage detection unit, a first interface, a second interface, a third interface and a fourth interface. The first interface is used for electrical connection with a first device, the second interface is used for electrical connection with a second device, the third interface is used for electrical connection with a third device, and the fourth interface is used for electrical connection with a power supply device. The protocol unit is electrically connected with the first switch unit, the second switch unit, the third switch unit and the voltage detection unit respectively. The voltage detection unit can output a detection voltage signal to the protocol unit according to a power supply voltage output by the power supply unit, and the protocol unit determines whether the third interface is connected with the third device according to the high and low levels of the detection voltage signal. When the detection voltage signal received by the protocol unit is a high level signal, it is determined that the third interface is not connected with the third device, the protocol unit controls the third switch unit to be turned off, and all the power of the power supply device is distributed to the first interface and the second interface, so that the power of the power supply device is fully utilized and energy waste is avoided. Therefore, the multi-interface charging line provided in the embodiments of the present application can control the third switch unit to be turned off by the protocol unit when the third interface is not connected with the third device, so that all the power of the power supply device is distributed to the first interface and the second interface, and there is no need to reserve power for the third interface, the charging efficiency of the first interface and the second interface is improved, and the charging efficiency of the multi-interface charging system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a principle block diagram of an existing multi-interface charging line;

[0019] Figure 2 is a principle block diagram of a multi-interface charging line provided in an embodiment of the present application;

[0020] Figure 3 is a principle block diagram of a multi-interface charging line provided in another embodiment of the present application;

[0021] Figure 4 is a circuit connection schematic diagram of a voltage detection unit provided in an embodiment of the present application;

[0022] Figure 5 is a principle block diagram of a multi-interface charging line provided in another embodiment of the present application.

[0023] In the diagram: 10, multi-interface charging cable; 101, first switching unit; 102, second switching unit; 103, third switching unit; 104, power supply unit; 105, protocol unit; 106, voltage detection unit; 107, current sampling unit; 20, first device; 30, second device; 40, third device; 50, power supply equipment. Detailed Implementation

[0024] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0025] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0026] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0027] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] likeFigure 1 As shown, the existing multi-interface charging line (one-to-three charging line) mainly includes a first interface, a second interface, a third interface, a fourth interface, a first switch unit, a second switch unit, a first power supply module, a second power supply module and a protocol unit. However, since it is unable to determine whether the third interface is connected to the third device, the protocol unit needs to fixedly reserve a part of power for the third interface, and therefore the total power of the first interface and the second interface can only be the power of the power supply device minus the power reserved for the third interface. In the case that the third interface is not connected to the third device, the reserved power is not fully utilized, resulting in low charging efficiency of the first interface and the second interface.

[0030] Based on the above problems, the multi-interface charging line provided by the embodiment of the present application includes a first switch unit, a second switch unit, a third switch unit, a power supply unit, a protocol unit, a voltage detection unit, a first interface, a second interface, a third interface and a fourth interface. The first interface is used to be electrically connected with a first device, the second interface is used to be electrically connected with a second device, the third interface is used to be electrically connected with a third device, the fourth interface is used to be electrically connected with a power supply device, and the protocol unit is electrically connected with the first switch unit, the second switch unit, the third switch unit and the voltage detection unit. The voltage detection unit can output a detection voltage signal to the protocol unit according to the power supply voltage output by the power supply unit, and the protocol unit determines whether the third interface is connected to the third device according to the high and low levels of the detection voltage signal. When the detection voltage signal received by the protocol unit is a high level signal, it is determined that the third interface is not connected to the third device at this time, the protocol unit controls the third switch unit to be turned off, and the total power of the power supply device is distributed to the first interface and the second interface, so that the power of the power supply device is fully utilized and energy waste is avoided. Therefore, the multi-interface charging line provided by the embodiment of the present application can control the third switch unit to be turned off by the protocol unit when the third interface is not connected to the third device, so that the total power of the power supply device is distributed to the first interface and the second interface, and there is no need to reserve power for the third interface, which improves the charging efficiency of the first interface and the second interface and improves the charging efficiency of the multi-interface charging system.

[0031] In order to illustrate the technical solutions described in the present application, the following will be described by specific embodiments.

[0032] Figure 2 The principle block diagram of the multi-interface charging line 10 provided by the embodiment of the present application is shown. Referring to Figure 2As shown, the multi-interface charging line 10 includes a first switching unit 101, a second switching unit 102, a third switching unit 103, a power supply unit 104, a protocol unit 105, a voltage detection unit 106, a first interface, a second interface, a third interface, and a fourth interface. The power supply unit 104 is electrically connected with the first switching unit 101, the second switching unit 102, the third switching unit 103, the protocol unit 105, the fourth interface, and the voltage detection unit 106 respectively, the protocol unit 105 is electrically connected with the first switching unit 101, the second switching unit 102, the third switching unit 103, the voltage detection unit 106, the first interface, the second interface, and the fourth interface respectively, the first switching unit 101 is electrically connected with the first interface, the second switching unit 102 is electrically connected with the second interface, the third interface is electrically connected with the third switching unit 103 and the voltage detection unit 106 respectively, the first interface is used for being electrically connected with the first device 20, the second interface is used for being electrically connected with the second device 30, the third interface is used for being electrically connected with the third device 40, and the fourth interface is used for being electrically connected with the power supply device 50.

[0033] Specifically, the voltage detection unit 106 can output a detection voltage signal to the protocol unit 105 according to the power supply voltage output by the power supply unit 104, and the protocol unit 105 determines whether the third interface is connected with the third device 40 according to the high and low levels of the detection voltage signal. When the detection voltage signal received by the protocol unit 105 is a high level signal, it is determined that the third interface is not connected with the third device 40 at this time, the protocol unit 105 controls the third switching unit 103 to be turned off, and all the power of the power supply device 50 is distributed to the first interface and the second interface, so as to ensure that the power of the power supply device 50 is fully utilized and energy waste is avoided. Therefore, the multi-interface charging line 10 provided by the embodiment of the application can control the third switching unit 103 to be turned off through the protocol unit 105 when the third interface is not connected with the third device 40, so as to ensure that all the power of the power supply device 50 is distributed to the first interface and the second interface, without reserving power for the third interface, thereby improving the charging efficiency of the first interface and the second interface, and improving the charging efficiency of the multi-interface charging system.

[0034] It should be noted that when the detection voltage signal received by the protocol unit 105 is a low level signal, it is determined that the third interface is connected with the third device 40 at this time, the protocol unit 105 controls the third switching unit 103 to be turned on, and the power of the power supply device 50 is distributed to the first interface and the second interface after subtracting the power reserved for the third interface.

[0035] It should be noted that the protocol unit 105 can also control the turn-on and turn-off of the first switch unit 101 and the second switch unit 102. Specifically, the protocol unit 105 can obtain first state information of whether the first interface accesses the first device 20 and second state information of whether the second interface accesses the second device 30, and determine the turn-on and turn-off of the first switch unit 101 and the second switch unit 102 according to the first state information and the second state information, so as to finally realize reasonable distribution of the power of the power supply device 50 and complete voltage configuration.

[0036] For example, the power supply device 50 can be a power adapter, and the power adapter supplies power to the power supply unit 104. The power supply unit 104 supplies power to the protocol unit 105 and the voltage detection unit 106 after voltage conversion of the input power, and the supply voltage can be set to 5V.

[0037] It should be noted that, as shown in Figure 3 The first interface and the fourth interface are both USB-C interfaces, the second interface is a USB-C interface or a Lightning interface, and the third interface is a USB-B interface. Among them, the first interface, the second interface and the fourth interface all contain a power line, a ground line and a CC (Configuration Channel, configuration channel), and the third interface contains a power line and a ground line. Among them, the CC configuration channel is used for device capability configuration and identification of device type.

[0038] It should be noted that the fourth interface and the power supply device 50 can realize power circuit connection and CC configuration channel connection, the fourth interface and the first switch unit 101, the second switch unit 102, the third switch unit 103 and the power supply unit 104 can realize power circuit connection, and the fourth interface and the protocol unit 105 can realize CC configuration channel connection. The first interface and the first switch unit 101 can realize power circuit connection, the first interface and the protocol unit 105 can realize CC configuration channel connection, and the first interface and the first device 20 can realize power circuit connection and CC configuration channel connection. The second interface and the second switch unit 102 can realize power circuit connection, the second interface and the protocol unit 105 can realize CC configuration channel connection, and the second interface and the second device 30 can realize power circuit connection and CC configuration channel connection. The third interface and the third device 40 can realize power circuit connection. The protocol unit 105 and the first switch unit 101, the second switch unit 102, the third switch unit 103 and the voltage detection unit 106 can realize control electrical connection.

[0039] For example, the first device 20, the second device 30 and the third device 40 can all be a mobile phone, a computer or other electronic devices.

[0040] It needs to be explained that, as shown in the multi-interface charging line, Figure 1 When the third interface accesses the third device 40, the second power module needs to convert the large voltage output by the power supply device 50 through the fourth interface into a small voltage and transmit it to the third device 40. Since the second power module needs to convert the voltage, there will be power loss and heat generation. Compared with Figure 1 , Figure 2 The multi-interface charging line 10 in the present application shown in the figure uses a third switch unit 103 and a voltage detection unit 106 to replace the existing second power module in the multi-interface charging line, which can reduce power loss and heat generation, and reduce the cost of the product.

[0041] In an embodiment of the present application, the first switch unit 101 includes a first switch, the first end of the first switch is electrically connected with the fourth interface, the power supply unit 104, the second switch unit 102 and the third switch unit 103 respectively, the second end of the first switch is electrically connected with the first interface, and the control end of the first switch is electrically connected with the protocol unit 105.

[0042] Specifically, the first switch is used to control the connection between the fourth interface and the first interface, ensuring that the power supply device 50 can charge the first device 20. When the first interface is electrically connected with the first device 20, the protocol unit 105 obtains that the first interface accesses the first device 20 through the CC configuration channel, and controls the first switch to be turned on, so that the fourth interface and the first interface are connected, realizing that the power supply device 50 supplies power to the first device 20.

[0043] In an embodiment of the present application, the second switch unit 102 includes a second switch, the first end of the second switch is electrically connected with the fourth interface, the power supply unit 104, the first switch unit 101 and the third switch unit 103 respectively, the second end of the second switch is electrically connected with the second interface, and the control end of the second switch is electrically connected with the protocol unit 105.

[0044] Specifically, the second switch is used to control the connection between the fourth interface and the second interface, ensuring that the power supply device 50 can charge the second device 30. When the second interface is electrically connected with the second device 30, the protocol unit 105 obtains that the second interface accesses the second device 30 through the CC configuration channel, and controls the second switch to be turned on, so that the fourth interface and the second interface are connected, realizing that the power supply device 50 supplies power to the second device 30.

[0045] In an embodiment of the present application, the third switch unit 103 includes a third switch, the first end of the third switch is electrically connected with the fourth interface, the power supply unit 104, the first switch unit 101 and the second switch unit 102 respectively, the second end of the third switch is electrically connected with the third interface, and the control end of the third switch is electrically connected with the protocol unit 105.

[0046] Specifically, the third switch is configured to control the connection between the fourth interface and the third interface, so that the power supply device 50 can charge the third device 40. When the third interface is electrically connected with the third device 40, the protocol unit 105 obtains that the third interface is connected with the third device 40 through the detection voltage signal output by the voltage detection unit 106, and controls the third switch to be turned on, so that the fourth interface and the third interface are connected, and the power supply device 50 supplies power to the third device 40.

[0047] It should be noted that the third switch can be used to eliminate the second power module in the existing multi-interface charging line, so as to reduce the power loss and heat generation, and reduce the cost of the product.

[0048] In an embodiment of the present application, the power supply unit 104 comprises a voltage converter, and the voltage converter is electrically connected with the first switch unit 101, the second switch unit 102, the third switch unit 103, the protocol unit 105, the fourth interface and the voltage detection unit 106 respectively.

[0049] Specifically, the voltage converter can be a step-down converter, which is configured to convert the large voltage output by the power supply device 50 into a small voltage, so as to supply power to the protocol unit 105 and the voltage detection unit 106, and ensure that the protocol unit 105 and the voltage detection unit 106 work normally and stably.

[0050] In an embodiment of the present application, the protocol unit 105 comprises a controller chip, and the controller chip is connected with the first interface, the second interface and the fourth interface respectively, and is connected with the first switch unit 101, the second switch unit 102 and the third switch unit 103 respectively, and is connected with the power supply unit 104 and the voltage detection unit 106 respectively.

[0051] Specifically, the controller chip is configured to control the first switch unit 101 to be turned on when the first interface is connected with the first device 20. The controller chip is also configured to control the second switch unit 102 to be turned on when the second interface is connected with the second device 30. The controller chip is also configured to obtain the connection between the third interface and the third device 40 through the voltage detection unit 106, and control the third switch unit 103 to be turned on when the third interface is connected with the third device 40.

[0052] Specifically, the controller chip is configured to control the first switch unit 101 to be turned on when the first interface is connected with the first device 20. The controller chip is also configured to control the second switch unit 102 to be turned on when the second interface is connected with the second device 30. The controller chip is also configured to obtain the connection between the third interface and the third device 40 through the voltage detection unit 106, and control the third switch unit 103 to be turned on when the third interface is connected with the third device 40.

[0053] In an embodiment of the present application, as Figure 4As shown, the voltage detection unit 106 comprises a first resistor R1 and a first diode D1, a first end of the first resistor R1 is electrically connected with the power supply unit 104, a second end of the first resistor R1 is electrically connected with an anode of the first diode D1 and the protocol unit 105 respectively, a cathode of the first diode D1 is electrically connected with the third interface and the third device 40 respectively.

[0054] Specifically, the first resistor R1 serves as a pull-up resistor, the first end of the first resistor R1 can receive the 5V voltage output by the power supply unit 104, and the first diode D1 serves as a unidirectional conduction. The voltage at the connection point of the second end of the first resistor R1 and the anode of the first diode D1 is the detection voltage output by the voltage detection unit 106 to the protocol unit 105. The protocol unit 105 determines whether the third interface is connected with the third device 40 according to the received detection voltage signal, so as to ensure the reasonable distribution of the power of the power supply device 50. Specifically, when the first diode D1 is cut off, the anode of the first diode D1 is pulled high, at this time, the detection voltage signal received by the protocol unit 105 is a high-level signal, it is determined that the third interface is not connected with the third device 40, the protocol unit 105 controls the third switch unit 103 to be turned off, and the entire power of the power supply device 50 is distributed to the first interface and the second interface, so as to ensure that the power of the power supply device 50 is fully utilized and energy waste is avoided. When the first diode D1 is turned on, the anode of the first diode D1 is pulled low, at this time, the detection voltage signal received by the protocol unit 105 is a low-level signal, it is determined that the third interface is connected with the third device 40, the protocol unit 105 controls the third switch unit 103 to be turned on, and the power of the power supply device 50 is distributed to the first interface and the second interface after subtracting the power reserved for the third interface.

[0055] In an embodiment of the present application, as shown in Figure 5 The multi-interface charging line 10 further comprises a current sampling unit 107, which is electrically connected with the protocol unit 105 and the third interface respectively.

[0056] Specifically, the current sampling unit 107 is configured to sample a first current output by the third interface and transmit the first current to the protocol unit 105. The protocol unit 105 compares the received first current with a set current, if the first current is less than the set current, it indicates that the third device 40 is pulled out from the third interface, the protocol unit 105 controls the third switch unit 103 to be turned off, and the entire power of the power supply device 50 is distributed to the first interface and the second interface, so as to ensure that the power of the power supply device 50 is fully utilized and the charging efficiency of the charging system is improved.

[0057] In one embodiment of the present application, the embodiment of the present application further discloses a multi-interface charging system, comprising the power supply device 50, the first device 20, the second device 30, the third device 40 and the multi-interface charging line 10 described above, the power supply device 50 is electrically connected with the fourth interface in the multi-interface charging line 10, the first device 20 is electrically connected with the first interface in the multi-interface charging line 10, the second device 30 is electrically connected with the second interface in the multi-interface charging line 10, and the third device 40 is electrically connected with the third interface in the multi-interface charging line 10.

[0058] Specifically, the multi-interface charging system uses the multi-interface charging line 10 described above, and when the third interface is not connected with the third device 40, the power of the power supply device 50 can be fully utilized, and the charging efficiency of the charging system is greatly improved.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A multi-interface charging cord, comprising: The first switch unit, the second switch unit, the third switch unit, the power supply unit, the protocol unit, the voltage detection unit, the first interface, the second interface, the third interface and the fourth interface are included. The power supply unit is electrically connected with the first switch unit, the second switch unit, the third switch unit, the protocol unit, the fourth interface and the voltage detection unit respectively, the protocol unit is electrically connected with the first switch unit, the second switch unit, the third switch unit, the voltage detection unit, the first interface, the second interface and the fourth interface respectively, the first switch unit is electrically connected with the first interface, the second switch unit is electrically connected with the second interface, the third interface is electrically connected with the third switch unit and the voltage detection unit respectively, the first interface is used for being electrically connected with a first device, the second interface is used for being electrically connected with a second device, the third interface is used for being electrically connected with a third device, and the fourth interface is used for being electrically connected with a power supply device.

2. The multi-interface charging cord of claim 1, wherein, The first switch unit includes a first switch, a first end of the first switch is electrically connected with the fourth interface, the power supply unit, the second switch unit and the third switch unit respectively, a second end of the first switch is electrically connected with the first interface, and a control end of the first switch is electrically connected with the protocol unit.

3. The multi-interface charging cord of claim 1, wherein, The second switch unit includes a second switch, a first end of the second switch is electrically connected with the fourth interface, the power supply unit, the first switch unit and the third switch unit respectively, a second end of the second switch is electrically connected with the second interface, and a control end of the second switch is electrically connected with the protocol unit.

4. The multi-interface charging cord of claim 1, wherein, The third switch unit includes a third switch, a first end of the third switch is electrically connected with the fourth interface, the power supply unit, the first switch unit and the second switch unit respectively, a second end of the third switch is electrically connected with the third interface, and a control end of the third switch is electrically connected with the protocol unit.

5. The multi-interface charging cord of claim 1, wherein, The power supply unit includes a voltage converter, and the voltage converter is electrically connected with the first switch unit, the second switch unit, the third switch unit, the protocol unit, the fourth interface and the voltage detection unit respectively.

6. The multi-interface charging cord of claim 1, wherein, The protocol unit includes a controller chip, and the controller chip is electrically connected with the first switch unit, the second switch unit, the third switch unit, the power supply unit, the voltage detection unit, the first interface, the second interface and the fourth interface respectively.

7. The multi -interface charging cord of claim 1, wherein, The voltage detection unit includes a first resistor and a first diode, a first end of the first resistor is electrically connected with the power supply unit, a second end of the first resistor is electrically connected with an anode of the first diode and the protocol unit respectively, and a cathode of the first diode is electrically connected with the third interface and the third device respectively.

8. The multi -interface charging cord of claim 1, wherein, The first interface and the fourth interface are USB-C interfaces, the second interface is a USB-C interface or a Lightning interface, and the third interface is a USB-B interface.

9. The multi -interface charging cord of any one of claims 1-8, wherein, The multi-interface charging line further comprises a current sampling unit, which is electrically connected with the protocol unit and the third interface respectively; the current sampling unit is used for sampling a first current output by the third interface and transmitting the first current to the protocol unit.

10. A multi-interface charging system, characterized by, The multi-interface charging line of any one of claims 1-9, comprising a power supply device, a first device, a second device, a third device, and the multi-interface charging line, the power supply device being electrically connected with a fourth interface in the multi-interface charging line, the first device being electrically connected with a first interface in the multi-interface charging line, the second device being electrically connected with a second interface in the multi-interface charging line, and the third device being electrically connected with a third interface in the multi-interface charging line.

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