Charging device with data line self-checking function

Abstract

The utility model discloses a charging device with a data line self-checking function. The charging device comprises a power supply unit, a first conversion unit, a bidirectional protocol control unit, a second conversion unit, a switching unit, a first interface and a second interface, the power supply unit is respectively connected with the first conversion unit and the second conversion unit, and the first conversion unit is connected with the first interface; the first conversion unit and the second conversion unit are respectively connected with the bidirectional protocol control unit; the bidirectional protocol control unit is respectively connected with the first interface and the second interface; two ends of the data line are respectively connected with the first interface and the second interface; and the switching unit is respectively connected with the bidirectional protocol control unit, the second conversion unit and the second interface. By implementing the device provided by the utility model, the self-inspection of the wire harness in charging connection can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging device technical field especially, it relates to a charging device with data line self -checking function. BACKGROUND

[0002] Most of the chargers and adapters on the current market, whether equipped with 1A, 2C interface or other types of USB interface, the main function is limited to providing power output for mobile phones and other devices. The A or C port of the USB of these devices usually only has output function, lacks input detection capability. This means that they cannot assess the status of the connected data line, such as internal resistance size, voltage drop, etc., thus leading to a series of problems, such as the quality of data lines on the market varies greatly, from inferior to superior, the price difference can reach more than 100 times, users often have difficulty in judging whether the data line used is suitable for high-power charging. When high-power chargers such as 35W to 300W are used with low-quality data lines, not only will it lead to low charging efficiency, but also may cause fire risk due to overheating. In some cases, poor data lines may prevent the charging process, and even damage the charged devices, such as smartphones, tablets or laptops.

[0003] Therefore, it is necessary to design a new device to realize self-checking of the wiring harness of the charging connection, to ensure a full range of high-performance charging experience from enhancing safety, optimizing charging efficiency to preventing overheating and fire accidents, and to realize fast and stable safe charging. SUMMARY

[0004] The utility model aims at overcoming the defects of prior art, provides a kind of charging device with data line self -checking function.

[0005] To solve the above technical problems, the purpose of the utility model is realized by the following technical schemes: provide a kind of charging device with data line self -checking function, including: power supply unit, first conversion unit, bidirectional protocol control unit, second conversion unit, switching unit, first interface and second interface;The power supply unit is connected with the first conversion unit and the second conversion unit respectively, and the first conversion unit is connected with the first interface;The first conversion unit and the second conversion unit are connected with the bidirectional protocol control unit respectively;The bidirectional protocol control unit is connected with the first interface and the second interface respectively;Two ends of data line are connected with the first interface and the second interface respectively;The switching unit is connected with the bidirectional protocol control unit, the second conversion unit and the second interface respectively.

[0006] Its further technical scheme is: the power supply unit includes AD-DC charger.

[0007] A further technical scheme of the present application is that the first conversion unit comprises a first BUCK-BOOST converter.

[0008] A further technical scheme of the present application is that the second conversion unit comprises a second BUCK-BOOST converter.

[0009] A further technical scheme of the present application is that the bidirectional protocol control unit comprises a PD bidirectional protocol control chip.

[0010] A further technical scheme of the present application is that the switching unit comprises a switching element.

[0011] A further technical scheme of the present application is that the first interface comprises a TYPE-C interface.

[0012] A further technical scheme of the present application is that the second interface comprises a TYPE-C interface.

[0013] A further technical scheme of the present application is that the charging device further comprises a control unit and a display module, wherein the control unit is connected to the display module and the bidirectional protocol control unit.

[0014] A further technical scheme of the present application is that the switching element comprises a MOS tube.

[0015] The present application has the following beneficial effects compared with the prior art: the present application integrates a power supply unit, first and second conversion units, a bidirectional protocol control unit, a switching unit and a display module, thereby realizing a self-checking function for a connection harness; when two ends of a data line are respectively inserted into a first interface and a second interface, a detection loop is automatically constructed, and the electrical characteristics of the cable are evaluated by the bidirectional protocol control unit; the control unit receives the results from the bidirectional protocol control unit and presents the results from the display module, and meanwhile, the first and second conversion units are responsible for stable voltage and current output, thereby ensuring the compatibility and fast charging capability of different devices.

[0016] The present application will be further described below in combination with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 1 A schematic block diagram of a charging device with a data line self-checking function is provided for the embodiments of the present application.

[0019] Figure 2 A specific circuit principle diagram of the charging device with the data line self-checking function is provided for the embodiments of the present application.

[0020] Figure 3 A principle schematic diagram of the charging device with the data line self-checking function is provided for the embodiments of the present application.

[0021] The identification in the figure is:

[0022] 10, power supply unit; 20, first conversion unit; 30, bidirectional protocol control unit; 40, control unit; 50, display module; 60, first interface; 70, second interface; 80, second conversion unit; 90, switching unit. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0024] It should be understood that, when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0026] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0027] Most current chargers and adapters lack input detection for connected data cables, and cannot assess the quality and electrical performance of the data cable. Due to the uneven quality of data cables on the market, users have difficulty determining whether they are suitable for high-power charging, which can lead to low charging efficiency or damage to the device. Low-quality data cables can cause overheating and even fire risks when used with high-power chargers. Devices lacking input detection cannot effectively avoid these safety hazards, affecting the reliability and safety of the charging process.

[0028] To this end, the utility model embodiment provides a data line self-checking device, which realizes self-checking of the wire harness connected for charging, ensures all-round high-performance charging experience from enhanced safety, optimized charging efficiency to prevention of overheating and fire accidents, and realizes fast and stable safe charging.

[0029] Specifically, the charging device with data line self-checking function realizes quality detection of the connected wire harness by integrating a power supply unit 10, two BUCK-BOOST conversion units, a PD bidirectional protocol control chip and a switching unit 90: when the data cable is inserted into the TYPE-C input and the second interface 70 at both ends, the system uses the built-in MOS tube switch to build a detection loop, measures and evaluates the resistance and voltage drop characteristics of the data cable. The PD bidirectional protocol control chip judges the wire harness state to be best, general or poor accordingly, and transmits the result to the control unit 40, which finally presents it to the user directly through the display screen, ensuring all-round high-performance charging experience from enhanced safety, optimized charging efficiency to prevention of overheating and fire accidents.

[0030] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings in the specification and specific embodiments.

[0031] Please refer to Figure 1 , Figure 1 The utility model embodiment provides a schematic block diagram of a charging device with data line self-checking function; the device can be used in a charger to realize self-checking of the wire harness connected for charging, ensure all-round high-performance charging experience from enhanced safety, optimized charging efficiency to prevention of overheating and fire accidents, and realize fast and stable safe charging.

[0032] The charging device with a data line self-checking function comprises a power supply unit 10, a first conversion unit 20, a bidirectional protocol control unit 30, a second conversion unit 80, a control unit 40, a switching unit 90, a display module 50, a first interface 60, and a second interface 70. The power supply unit 10 is connected with the first conversion unit 20 and the second conversion unit 80 respectively, and the first conversion unit 20 is connected with the first interface 60. The first conversion unit 20 and the second conversion unit 80 are connected with the bidirectional protocol control unit 30 respectively. The bidirectional protocol control unit 30 is connected with the first interface 60 and the second interface 70 respectively. The control unit 40 is connected with the display module 50 and the bidirectional protocol control unit 30 respectively. The two ends of the data line are connected with the first interface 60 and the second interface 70 respectively. The switching unit 90 is connected with the bidirectional protocol control unit 30, the second conversion unit 80, and the second interface 70 respectively.

[0033] In this embodiment, there are two main forms of data lines:

[0034] The data line with a double-ended TYPE-C interface is suitable for connecting two devices supporting the TYPE-C interface.

[0035] The data line with one end as a TYPE-A interface and the other end as a TYPE-C interface is suitable for connecting traditional USB devices and new TYPE-C devices.

[0036] The device of this embodiment is implemented based on the following principles:

[0037] During the charging process, the protocol chip is responsible for monitoring and managing the voltage and current. For the data line with a double-ended TYPE-C interface, when the two ends are connected, the protocol chip can provide a specific voltage (such as 5V or 9V) and monitor the loop state transmitted through the cable to the other end and then returned to the protocol chip. This process involves the following steps:

[0038] First, as shown in Figure 3 , the protocol chip detects whether a complete loop is formed between the A end and the B end. Only when the loop is confirmed to be established, the self-checking program will be started.

[0039] Once the loop is established, the system will select a fixed current value (for example, in the range of 0.5-3A) for testing and apply the corresponding voltage (such as 5V).

[0040] Since a fixed current value is selected, according to Ohm's law (U=I*R), the resistance value of the wire harness can be calculated by measuring the voltage difference between the A end and the B end. Different quality of wire harnesses will result in different resistance values, which will further affect the final voltage at the B end.

[0041] By comparing the voltage difference between A and B or directly measuring the resistance, the protocol IC can assess the status of the wire harness and determine whether it is suitable for the current charging needs.

[0042] Specifically, the evaluation of wire harness quality is based on its maximum working current and corresponding internal resistance, usually represented by AWG (American Wire Gauge) specifications. Here are specific evaluation methods for wire harnesses of different grades:

[0043] For a wire harness with AWG17 specifications, its designed working current exceeds 4.1A, and the internal resistance is 16.3Ω / Km. For a one-meter long wire harness, under the condition of 5V / 3A, the voltage measured at B should be close to 4.951V or higher in ideal conditions. This indicates that the wire harness has low resistance characteristics and is the best choice.

[0044] For a wire harness with AWG18 specifications, its working current range is above 3.2A, and the internal resistance is 21.4Ω / Km. Under the same conditions, if the voltage measured at B is between 4.938V and 4.950V, the wire harness is considered to be of ordinary grade.

[0045] AWG19 specification wire harness, suitable for working current above 2.6A, internal resistance is 26.9Ω / Km. If the B end voltage is lower than 4.919V or between 4.919V and 4.937V, it indicates that the wire harness quality is poor and may not be suitable for high-performance charging needs.

[0046] In summary, the device of the present embodiment realizes effective self-checking of the charging wire harness through precise voltage, current control and impedance measurement technology, ensuring safe and efficient charging experience. At the same time, through clear evaluation criteria, users can easily identify the quality grade of the wire harness and choose the most suitable charging accessories for their own devices.

[0047] Specifically, the power supply unit 10 serves as the power source for the entire system, responsible for converting external alternating current (AC 96V~240V) into direct current (DC) suitable for subsequent circuit operation. The power supply unit 10 is connected to the first conversion unit 20 and the second conversion unit 80 respectively to ensure stable power supply.

[0048] The first conversion unit 20 processes the voltage received from the power supply unit 10 and adjusts the output voltage as needed. This unit is connected to external devices (such as mobile phones or computers) through the first interface 60 and communicates with the bidirectional protocol control unit 30 to dynamically adjust output parameters according to the negotiated charging protocol.

[0049] The bidirectional protocol control unit 30 supports multiple fast charging standards (e.g. PD, QC, AFCS, etc.). It not only manages the charging protocol handshake process with external devices, but also coordinates the operation of the first conversion unit 20 and the second conversion unit 80, ensuring the correct voltage and current output. In addition, it also participates in the data line quality self-checking mechanism, and interacts with the control unit 40 to deliver the necessary information.

[0050] The second conversion unit 80 has similar functions to the first conversion unit 20, but is particularly characterized in that it can operate bidirectionally, that is, it can not only obtain energy from the power supply unit 10 and output to external devices, but also accept energy input from external devices. This makes the device capable of being used as a charger or a power bank.

[0051] The control unit 40 receives status reports from the bidirectional protocol control unit 30 and communicates with it through the SCL and SDA lines. 2 More importantly, it drives the display module 50 according to the self-checking results, feeding back the quality of the data line to the user.

[0052] The switching unit 90 is controlled by the bidirectional protocol control unit 30. When performing data line self-checking, it creates a short-circuit path to measure the voltage drop, helping to determine the status of the data line.

[0053] The display module 50 is composed of LED lights or other types of indicators, serving as part of the user interface, intuitively showing system status or warning information, especially about the quality of the data line.

[0054] The first interface 60 and the second interface 70 are USB Type-C physical interfaces, which not only transmit power, but also carry control signals transmitted on the CC, DP, and DM lines. When both ends are Type-C interfaces, the self-checking mode can be activated.

[0055] In the normal charging process, the power supply unit 10 first converts alternating current into direct current, and then adjusts the output through the first conversion unit 20 to the external device. At the same time, the bidirectional protocol control unit 30 negotiates the best charging solution with the external device and adjusts the output of the first conversion unit 20 accordingly.

[0056] For the second conversion unit 80, it can reverse its role when necessary to obtain energy from external devices and supply power to other devices, reflecting the flexibility of the device.

[0057] When entering the data line self-checking mode, the switching unit 90 will act under the instruction of the bidirectional protocol control unit 30 to form a closed loop. At this time, by comparing the voltage drop on the data line with the reference voltage, the quality of the data line can be determined. Figure 3The voltage difference between VOUT1 and VOUT2, shown, in combination with resistance calculations, can assess the quality of the data line. Ultimately, this information is passed to the control unit 40, which is then presented to the user by the display module 50.

[0058] In an embodiment, referring to Figure 2 The power supply unit 10 described above comprises an AD-DC charger. The power supply unit 10 in this embodiment is mainly composed of an AC-DC charger designed to accept a wide range of AC input voltages, i.e. AC 96V-240V. This wide range of input voltages makes the charger suitable for use in different regions of the world with different power standards. The main task of the AC-DC charger is to convert AC power to DC power, providing the necessary power support for the entire self-test device.

[0059] The AC-DC charger is connected to the entire device through Figure 2 The connection point marked as VIN is the energy inlet of the entire circuit, ensuring that the power from the external grid can be safely and stably transmitted to the subsequent modules. In order to achieve efficient energy conversion, advanced power conversion techniques are used inside the AC-DC charger, such as the use of high-frequency switching mode power supplies to improve efficiency and reduce size.

[0060] In an embodiment, referring to Figure 2 The first conversion unit 20 described above comprises a first BUCK-BOOST converter. A BUCK-BOOST converter is a DC-DC converter that can raise or lower the input voltage to the desired output voltage level. This means that it can work under different input voltage conditions and provide a stable charging voltage for external devices.

[0061] When the input voltage is higher than the desired output voltage, the first converter operates in buck (BUCK) mode, reducing the voltage through switching regulation to ensure that the output meets expectations. Conversely, if the input voltage is lower than the desired value, the converter switches to boost (BOOST) mode, increasing the voltage to meet the demand.

[0062] This flexibility makes the first BUCK-BOOST converter very suitable for applications that require adaptation to a wide range of input voltages, such as portable charging devices, which can handle power received from different power source types (e.g. car battery, household outlet, etc.) and stably charge connected devices.

[0063] In an embodiment, referring to Figure 2The second conversion unit 80 described above includes a second BUCK-BOOST converter. Similar to the first converter, the second conversion unit 80 also contains a BUCK-BOOST converter. However, its particularity lies in supporting bidirectional energy flow, both as a charger and as a power bank.

[0064] In charging mode, it receives energy from the power supply unit 10 and adjusts it to a voltage and current suitable for charging external devices. In discharging mode, it can accept energy provided by external devices and supply it to other devices.

[0065] In an embodiment, please refer to Figure 2 The bidirectional protocol control unit 30 described above includes a PD bidirectional protocol control chip. The PD bidirectional protocol control chip is an integrated circuit that complies with the USB Power Delivery standard, designed to achieve fast and safe power transmission.

[0066] Responsible for the charging protocol handshake process with external devices, automatically identifies the maximum power supported by the other party, and sets the optimal charging parameters accordingly. According to the real-time communication results, the working state of the first and second converters is adjusted in real time, including voltage and current settings, to ensure efficient charging while protecting devices from overvoltage or overcurrent damage. Participate in the data line quality detection process, combined with logical judgment of whether the line is intact, output the results to the display module 50 by the control unit 40.

[0067] In an embodiment, please refer to Figure 2 The switching unit 90 described above includes a switching component.

[0068] In an embodiment, please refer to Figure 2 The switching component described above includes MOS tube Q1. MOS tube is a field effect transistor that plays the role of a switch in the circuit, used to control the selection of current paths, thereby realizing the switching between different working modes.

[0069] The switching unit 90 used to realize the switching between different working modes specifically includes a switching component. This switching component is responsible for the selection of current paths inside the circuit, and is a key component to ensure that the system can smoothly transition between different operating states as planned.

[0070] MOS tube Q1 controls the on or off state through the voltage relationship between its gate, source and drain, thereby determining whether the current can flow from the source to the drain. When the appropriate gate voltage is applied, MOS tube Q1 will be in the on state, allowing current to pass; on the contrary, if the gate voltage is removed or reduced, the MOS tube will enter the off state, preventing current flow.

[0071] In this embodiment, MOS tube Q1 serves as the core component, and its switching behavior directly determines the operation mode of the device. For example, in one mode of operation, the device needs to pass current through a specific path to power a load; in another mode, it requires cutting off the current on that path and instead selecting another path. By precisely controlling the signal applied to the gate of MOS tube Q1, rapid and reliable switching between these different modes of operation can be achieved, ensuring that the entire system operates as intended.

[0072] In an embodiment, referring to Figure 2 The first interface 60 described above includes a TYPE-C interface, specifically a type-c1 interface.

[0073] In an embodiment, referring to Figure 2 The second interface 70 described above includes a TYPE-C interface, specifically a type-c2 interface.

[0074] The first interface 60 is a type-c1 interface, used to receive power input or data transmission from an external power source. This interface is compatible with the USB Power Delivery (PD) protocol, supporting fast charging and other advanced functions.

[0075] The second interface 70 is a type-c2 interface, responsible for providing power output or data exchange to external devices. Similarly, it also follows the TYPE-C standard and can be compatible with a variety of terminal devices, ensuring a wide range of applications.

[0076] In an embodiment, referring to Figure 2 The display module 50 described above includes a display screen.

[0077] In an embodiment, referring to Figure 2 The display module 50 described above also includes an LED light.

[0078] The display screen is used to visually display system status, setting options and other information to the user. This allows users to easily monitor and manage the operating parameters of the device.

[0079] The LED light serves as an auxiliary indication device, capable of conveying key status information such as power connection status, charging progress, etc. in a simple and direct manner. This visual feedback is crucial for improving user experience.

[0080] Specifically, referring to Figure 2 The first BUCK-BOOST converter is connected to the first interface 60 through resistor RCS1; the second BUCK-BOOST converter is connected to the second interface 70 through resistor RCS2; MOS tube Q1 is connected to the second interface 70 through resistor RS.

[0081] The first BUCK-BOOST converter is connected to the first interface 60 (i.e., type-c1) through a resistor RCS1. The resistor RCS1 here serves as a current limiter, protecting the circuit from overload damage while also helping to stabilize the input voltage, ensuring the normal operation of the BUCK chip of the first BUCK-BOOST converter.

[0082] The second BUCK-BOOST converter is connected to the second interface 70 (i.e., type-c2) through a resistor RCS2. Similarly, the resistor RCS2 helps to adjust and stabilize the output voltage, ensuring the safety and reliability of power supply to external devices.

[0083] The MOS tube Q1 is connected between the second interface 70 through a resistor RS. The resistor RS not only helps to control the working state of the MOS tube, but also provides necessary electrical isolation to prevent possible short circuits or other abnormal conditions from affecting the entire system.

[0084] Please refer to Figure 2 , the single-chip microcomputer in the figure refers to the control unit 40, and the working process of the entire device is as follows:

[0085] VIN represents an AC 96V-240V AC-DC charger, which controls the BUCK-BOOST1 chip, i.e., the first BUCK-BOOST converter, through the PD bidirectional protocol chip. For example, the PD, QC, AFCS, FCP, SCP, PPS, etc. protocols can be transmitted through the type-c1 interface (its 5, 6, 7, 8, 9 pins are connected to the CCA1, CCA2, DPA, DMA pins of the PD bidirectional protocol chip), and the corresponding protocols on the mobile phone or computer end realize handshaking, so that the PD bidirectional protocol chip adjusts the voltage and current level of the AC-DC output according to the demand.

[0086] For the type-c2 interface, similarly, VIN also represents the same AC-DC charger, but this time it controls the second BUCK-BOOST converter, i.e., the BUCK-BOOST2 chip in the figure, through the PD bidirectional protocol chip. It is worth noting that the type-c2 interface not only supports the protocol handshake function (its 5, 6, 7, 8, 9 pins are connected to the CCB1, CCB2, DPB, DMB pins of the PD bidirectional protocol chip), but also has input and output capabilities due to the combination of the bidirectional characteristics of the second BUCK-BOOST converter. This means that the type-c2 interface can be used as both a receiving end and a sending end, further enhancing the flexibility of the system.

[0087] When both type-c1 and type-c2 are connected with TYPE-C data line, the self-checking line function allows the system to detect and evaluate the quality of the data line. Specifically, VOUT1 connects with the corresponding pins of TYPE-C2 interface through the 3rd, 4th, 13th and 14th pins of type-c1 interface, forming a path to VOUT2. At this time, the PD bidirectional protocol chip sends a level signal to turn on MOS tube Q1, which is short-circuited to ground, thus forming a complete loop from VOUT2 ground back to the PD bidirectional protocol chip, VOUT2 pin and another CSN1 pin from VOUT1 to the PD bidirectional protocol chip. This process allows the system to measure the data line voltage difference value equal to VOUT1 minus VOUT2. By analyzing this voltage difference value and considering the resistance factor, the system can determine the state of the data line as best, general or poor.

[0088] Finally, the PD bidirectional protocol chip transmits the above determination result to the corresponding I / O pin of the single-chip microcomputer through its SCL and SDA pins, and then displays it through the LED lamp, so as to intuitively inform the user of the quality status of the data line, i.e. whether it is in the best state, the general state or the poor state.

[0089] In the embodiment, the models of the above-mentioned second BUCK-BOOST converter and the first BUCK-BOOST converter are respectively but not limited to SC8701; the model of the above-mentioned single-chip microcomputer is but not limited to MC9959; and the model of the above-mentioned PD bidirectional protocol chip is but not limited to SW3568.

[0090] The charging device with data line self-checking function realizes the self-checking function of the connecting cable by integrating the power supply unit 10, the first and second conversion units 80, the bidirectional protocol control unit 30, the switching unit 90 and the display module 50: when the data line is inserted into the input and second interfaces 70 at both ends, a detection loop is automatically constructed, and the electrical characteristics of the cable are evaluated by the bidirectional protocol control unit 30; the control unit 40 receives the result from the bidirectional protocol control unit 30 and presents it from the display module 50, and at the same time, the first and second conversion units 80 are responsible for stabilizing the voltage and current output, ensuring the compatibility and fast charging capability of different devices. This design not only enhances the overall safety, but also provides preventive maintenance, ensuring a fast and stable safe charging experience.

[0091] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A charging device with a data line self-checking function, characterized in that, Comprise: a power supply unit, a first conversion unit, a bidirectional protocol control unit, a second conversion unit, a switching unit, a first interface and a second interface; the power supply unit is connected with the first conversion unit and the second conversion unit respectively, the first conversion unit is connected with the first interface; the first conversion unit and the second conversion unit are connected with the bidirectional protocol control unit respectively; the bidirectional protocol control unit is connected with the first interface and the second interface respectively; two ends of a data line are connected with the first interface and the second interface respectively; the switching unit is connected with the bidirectional protocol control unit, the second conversion unit and the second interface respectively.

2. The charging device with a data line self-checking function according to claim 1, characterized in that, The power supply unit comprises an AD-DC charger.

3. The charging device with a data line self-checking function according to claim 1, characterized in that, The first conversion unit comprises a first BUCK-BOOST converter.

4. The charging apparatus with data line self-checking function according to claim 1, characterized in that, The second conversion unit comprises a second BUCK-BOOST converter.

5. The charging apparatus with data line self-checking function according to any one of claims 1 to 4, characterized in that, The bidirectional protocol control unit comprises a PD bidirectional protocol control chip.

6. The charging apparatus with data line self-checking function according to any one of claims 1 to 4, characterized in that, The switching unit comprises a switch.

7. The charging apparatus with data line self-checking function according to any one of claims 1 to 4, characterized in that, The first interface comprises a TYPE-C interface.

8. The charging apparatus with data line self-checking function according to any one of claims 1 to 4, characterized in that, The second interface comprises a TYPE-C interface.

9. The charging apparatus with data line self-checking function according to any one of claims 1 to 4, characterized in that, Further comprise: a control unit and a display module, the control unit is connected with the display module and the bidirectional protocol control unit respectively.

10. The charging apparatus with a data line self-checking function according to claim 6, characterized in that, The switch comprises a MOS tube.

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