USB interface anti-burning device and to-be-charged device

Abstract

The utility model discloses a USB interface anti-burning device and a to-be-charged device, and relates to the interface anti-burning field, a USB interface is used for plugging a USB joint of a charging device, the USB joint is connected with a power bus of the to-be-charged device after being connected, and a temperature detection module in the device is connected with the USB interface and a processor; the first end of the controllable switch module is connected with the power bus, the second end is grounded, and the control end is connected with the processor; the processor controls the controllable switch module to be switched on when the USB interface is short-circuited according to the temperature of the interface and the temperature of the battery, so that the charging equipment stops electric energy output; and the controllable switch module is controlled to be switched off when the USB interface is not short-circuited, so that the charging equipment can output electric energy conveniently. According to the scheme, the control module in the to-be-charged equipment is reused as the processor, only two IO ports are occupied, short-circuit processing of the USB interface can be reliably achieved in combination with the controllable switch module and the temperature detection module, the USB interface is prevented from being burnt out, and cost reduction is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of interface anti-burn technology, and in particular to a USB interface anti-burn device and a device to be charged. Background Technology

[0002] Mobile phones have a USB (Universal Serial Bus) interface, through which an adapter is connected for charging. To prevent the USB interface from burning out during charging, two main protection methods are currently used. The first method is to use an overcurrent protection fuse to blow when there is an overcurrent at the USB interface, but this fuse is usually for single use, which limits its practical application. The second method is to use an overcurrent protection chip, but this chip is usually more expensive, and considering factors such as clock synchronization and control, it will occupy more than two I / O ports (input / output ports) of the phone's CPU (Central Processing Unit), which is not conducive to the efficient utilization of the CPU's I / O ports.

[0003] Therefore, how to provide an effective technical solution to prevent USB interfaces from burning out is an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention provides a USB interface anti-burn device and a device to be charged, which only requires two IO ports, can reliably realize the short circuit treatment of the USB interface, avoid the USB interface from being burned out, and help reduce costs.

[0005] To solve the above-mentioned technical problems, this utility model provides a USB interface anti-burn device, which is applied to a device with a USB interface to be charged; the USB interface is used for plugging and unplugging the USB connector of the charging device, and the USB connector is connected to the power bus of the device to be charged after being plugged in; the charging device is used to control the power output according to the detected level at the USB connector; the USB interface anti-burn device includes a controllable switch module, a temperature detection module, and a processor constituting the control module of the device to be charged;

[0006] The temperature detection module is connected to the USB interface and the processor respectively, and is used to detect the temperature of the USB interface and send it to the processor;

[0007] The first terminal of the controllable switch module is connected to the power bus of the device to be charged, the second terminal is grounded, and the control terminal is connected to the processor; the processor is also connected to the battery management module in the device to be charged, and the battery management module is used to detect the temperature of the battery in the device to be charged;

[0008] The processor is used to control the controllable switch module to turn on when the USB interface is short-circuited, so that the charging device stops outputting power, and to control the controllable switch module to turn off when the USB interface is not short-circuited, so that the charging device outputs power.

[0009] Furthermore, the temperature detection module includes a first resistor and a thermistor, and the temperature sensing surface of the thermistor is fitted to the outer shell of the USB interface.

[0010] One end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to one end of the thermistor and the sampling terminal of the processor; the other end of the thermistor is grounded.

[0011] Furthermore, it also includes current-limiting resistors;

[0012] The current-limiting resistor is connected in series with the controllable switch module, and one end of the series circuit is connected to the power bus of the device to be charged, while the other end of the series circuit is grounded.

[0013] Furthermore, the controllable switch module includes a controllable switch;

[0014] The first end of the controllable switch serves as the first end of the controllable switch module, the second end serves as the second end of the controllable switch module, and the control end serves as the control end of the controllable switch module.

[0015] Furthermore, the controllable switch module also includes a diode;

[0016] The anode of the diode is connected to the first terminal of the controllable switch, and the cathode is connected to the second terminal of the controllable switch.

[0017] Furthermore, the controllable switch module also includes a second resistor;

[0018] One end of the second resistor is connected to the control terminal of the controllable switch, and the other end is connected to the second terminal of the controllable switch.

[0019] To solve the above-mentioned technical problems, this utility model also provides a device to be charged, including a USB interface, a control module, a battery and a battery management module, and also includes the USB interface anti-burn device as described above, wherein the control module constitutes the processor in the USB interface anti-burn device;

[0020] The USB interface is used for plugging and unplugging the USB connector of the charging device, and the USB connector is connected to the power bus of the device to be charged after being plugged in; the charging device is used to control the power output according to the detected level at the USB connector.

[0021] The battery, the battery management module, and the control module are connected in sequence. The control module is also connected to the controllable switch module and the temperature detection module in the USB interface burn-out prevention device.

[0022] Furthermore, it also includes a display module;

[0023] The display module is connected to the control module and is used to display the result of the USB interface short circuit when the USB interface is short-circuited, and / or receive and display the processing prompt information corresponding to the short circuit sent by the control module.

[0024] Furthermore, it also includes a voice prompt module;

[0025] The voice prompt module is connected to the control module and is used to make a voice broadcast when the USB interface is short-circuited, and / or receive and broadcast the processing prompt information corresponding to the short circuit sent by the control module.

[0026] Furthermore, it also includes a storage module;

[0027] The storage module is connected to the control module and is used to record the result of a short circuit in the USB interface.

[0028] This application provides a USB interface burn-out prevention device and a device to be charged. The USB interface is used for plugging and unplugging the USB connector of the charging device, and after the USB connector is plugged in, it is connected to the power bus of the device to be charged. The USB interface burn-out prevention device includes a controllable switch module, a temperature detection module, and a processor constituting the control module of the device to be charged. The temperature detection module is connected to both the USB interface and the processor. The first terminal of the controllable switch module is connected to the power bus of the device to be charged, the second terminal is grounded, and the control terminal is connected to the processor. The processor controls the controllable switch module to conduct when the USB interface is short-circuited based on the temperature of the USB interface and the temperature of the battery, so that the charging device stops outputting power and avoids the temperature from rising further due to continued normal charging, which could burn out the USB interface. The processor controls the controllable switch module to turn off when the USB interface is not short-circuited, so that the charging device can output power normally and charge the device to be charged. It can be seen that this solution reuses the control module in the device to be charged as a processor, requiring only two I / O ports. Combined with the controllable switch module and the temperature detection module, it can reliably handle the short circuit of the USB interface, preventing the USB interface from burning out, which helps to reduce costs and facilitates practical applications.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 A schematic diagram of the structure of a USB interface anti-burn device provided by this utility model;

[0032] Figure 2 A schematic diagram of the temperature detection module in a USB interface burn-out prevention device provided by this utility model;

[0033] Figure 3 A schematic diagram of the controllable switch module in a USB interface burn-out prevention device provided by this utility model;

[0034] Figure 4 This is a schematic diagram of the structure of a device to be charged according to the present invention. Detailed Implementation

[0035] The core of this utility model is to provide a USB interface anti-burn device and a device to be charged, which only requires two IO ports, can reliably realize the short circuit treatment of the USB interface, avoid the USB interface from being burned out, and help reduce costs.

[0036] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0037] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] Please refer to Figure 1 , Figure 1 A schematic diagram of a USB interface anti-burn device provided by this utility model.

[0039] This USB interface burn-out prevention device is applied to a device to be charged with a USB interface 1; the USB interface 1 is used for plugging and unplugging the USB connector of the charging device and is connected to the power bus of the device to be charged after the USB connector is plugged in; the charging device is used to control the power output according to the detected level at the USB connector; the USB interface burn-out prevention device includes a controllable switch module 2, a temperature detection module 3, and a processor 4 that constitutes the control module of the device to be charged.

[0040] Temperature detection module 3 is connected to USB interface 1 and processor 4 respectively, and is used to detect the temperature of USB interface 1 and send it to processor 4;

[0041] The first end of the controllable switch module 2 is connected to the power bus of the device to be charged, the second end is grounded, and the control end is connected to the processor 4; the processor 4 is also connected to the battery management module 5 in the device to be charged, and the battery management module 5 is used to detect the temperature of the battery in the device to be charged.

[0042] The processor 4 controls the controllable switch module 2 to turn on when the USB interface 1 is short-circuited, so that the charging device stops outputting power, and controls the controllable switch module 2 to turn off when the USB interface 1 is not short-circuited, so that the charging device can output power.

[0043] In this embodiment, the specific form of the USB interface 1 is not particularly limited, including but not limited to a Type-C interface; the device to be charged includes a control module, USB interface 1, a battery and a battery management module, and the USB interface burn-out prevention device reuses the control module as a processor 4, where the processor 4 includes but is not limited to a CPU; the device to be charged includes but is not limited to electronic devices such as mobile phones, and the charging device can be an adapter that supports level detection at the USB connector.

[0044] Specifically, from the perspective of implementation principle, the battery management module 5 can detect the battery temperature and feed it back to the processor 4, and the temperature detection module 3 can detect the temperature at the USB interface 1 and feed it back to the processor 4. For the controller, based on the temperature of the USB interface 1 and the battery temperature, it controls the controllable switch module 2 to turn off when the USB interface 1 is not short-circuited. The charging device connects to the power bus of the device to be charged through the USB connector, thus normally outputting power to charge the device. At this time, the voltage level detected by the charging device at the USB connector is a high level indicating that no fault has occurred. The processor 4, based on the temperature of the USB interface 1 and the battery temperature, controls the controllable switch module 2 to turn on when the USB interface 1 is short-circuited. At this time, the voltage level detected by the charging device at the USB connector turns low, and the charging device stops outputting power to avoid further temperature increases due to continued normal charging, which could burn out the USB interface 1. It should be noted that the power bus of the device to be charged refers to the VBUS terminal of the device to be charged, and the control port connected to the processor 4 and the controllable switch module 2 can be a GPIO port (General Purpose Input Output).

[0045] It should also be noted that the temperature of USB interface 1 and the battery temperature can determine whether there is a short circuit or not at USB interface 1. Here, a short circuit includes two situations: a micro-short circuit and a complete short circuit. Specifically: Under normal circumstances, when the USB connector is inserted into USB interface 1, the voltage of the power bus of the device being charged, i.e., the VBUS terminal, will be greater than 3.0V, and the temperature of USB interface 1 will be around 30℃. Therefore, when the temperature of USB interface 1 is less than 30℃, it indicates that no short circuit has occurred, and correspondingly, processor 4 controls the controllable switch module 2 to turn off. When the battery temperature is not greater than 50℃ and the temperature of USB interface 1 is not less than 57℃, it indicates that a micro-short circuit has occurred at USB interface 1, and correspondingly, processor 4... The processor 4 controls the controllable switch module 2 to turn on. When the battery temperature is greater than 50°C and the temperature difference between the USB interface 1 and the battery temperature is not less than 7°C, it indicates that a micro short circuit has occurred at the USB interface 1. Correspondingly, the processor 4 controls the controllable switch module 2 to turn on. When the temperature difference between the USB interface 1 and the battery temperature is not less than 10°C, it indicates a pending short circuit state. If the temperature rises by more than 3°C within 1.5 seconds and the temperature difference between the USB interface 1 and the battery temperature is not less than 12°C in the pending short circuit state, it indicates that a complete short circuit has occurred at the USB interface 1. Correspondingly, the processor 4 controls the controllable switch module 2 to turn on. When the temperature at the USB interface 1 is not less than 100°C, it indicates a short circuit has occurred, and the processor 4 controls the controllable switch module 2 to turn on. It is understood that the numerical parameters mentioned above are only a preferred setting illustration, and can be flexibly adjusted as needed in actual applications. The detection of the temperature at USB interface 1 and the battery temperature can be performed at preset time intervals, which include, but are not limited to, 5 seconds. Specifically, when the temperature difference between USB interface 1 and the battery temperature is not less than 10°C, it is a pending short circuit state. In this case, the preset time interval can be set to 1.5 seconds to promptly determine whether a short circuit has occurred. Furthermore, the above settings facilitate timely detection of short circuit anomalies and whether the anomaly has been resolved.

[0046] In addition, preferably, when the charging device has the ability to output via burping, when a short circuit occurs in USB interface 1, the charging device activates short circuit protection and stops power output. Subsequently, after waiting for a few milliseconds or tens of milliseconds, burping output can be performed, that is, the output power is reduced to a level lower than the preset power before output. Since the power of burping output is very low, the interface where the micro-short circuit occurs will no longer heat up.

[0047] Understandably, the controllable switch module 2 can switch between on and off multiple times depending on whether the USB interface 1 is short-circuited or not, and can be reused.

[0048] In summary, this application provides a USB interface burn-out prevention device. By reusing the control module in the device to be charged as the processor 4, it only needs to occupy two I / O ports. Combined with the controllable switch module 2 and the temperature detection module 3, it can reliably realize the short circuit handling of the USB interface 1, avoid the USB interface 1 from being burned out, reduce costs, and facilitate practical applications.

[0049] Based on the above embodiments:

[0050] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the temperature detection module in a USB interface burn-out prevention device provided by this utility model.

[0051] In some embodiments, the temperature detection module 3 includes a first resistor R1 and a thermistor R2, with the temperature sensing surface of the thermistor R2 being fitted to the outer shell of the USB interface 1.

[0052] One end of the first resistor R1 is connected to the power supply, and the other end of the first resistor R1 is connected to one end of the thermistor R2 and the sampling terminal of the processor 4 respectively; the other end of the thermistor R2 is grounded.

[0053] In this embodiment, the temperature sensing surface of the thermistor R2 is tightly fitted to the outer shell of the USB interface 1 to quickly and accurately sense the temperature change of the USB interface 1. The thermistor R2 can be an NTC thermistor (Negative Temperature Coefficient), the sampling terminal of the processor 4 can be the ADC sampling terminal (Analog-to-Digital Converter) of the CPU, and the power supply can be the VCC terminal of the device to be charged to enable power connection. Then, the temperature of the USB interface 1 can be determined according to the voltage-current relationship.

[0054] It is understandable that the first resistor R1 is used for voltage division. There is no special limitation on the specific resistance value of the first resistor R1. It can be selected according to actual needs and the principle of ensuring circuit safety.

[0055] It should also be noted that, due to the limitations of the image display focus, Figure 2 The diagram omits the fit between the thermistor R2 and the casing of the USB interface 1, and focuses on showing the circuit connection diagram of the temperature detection module 3.

[0056] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the controllable switch module in a USB interface burn-out prevention device provided by this utility model.

[0057] In some embodiments, a current-limiting resistor R3 is also included;

[0058] The current-limiting resistor R3 is connected in series with the controllable switch module 2, and one end of the series circuit is connected to the power bus of the device to be charged, while the other end of the series circuit is grounded.

[0059] Specifically, the current-limiting resistor R3 is used to limit the current to ensure circuit safety and improve circuit reliability. There is no special limitation on the resistance value of the current-limiting resistor R3; it can be selected according to actual needs.

[0060] It should be noted that, Figure 3 Due to the limitations of the image display focus, the setup diagrams for the temperature detection module 3 and the battery management module 5 are temporarily omitted.

[0061] In some embodiments, the controllable switch module 2 includes a controllable switch Q1;

[0062] The first end of the controllable switch Q1 serves as the first end of the controllable switch module 2, the second end serves as the second end of the controllable switch module 2, and the control end serves as the control end of the controllable switch module 2.

[0063] In this embodiment, specifically, the controllable switch Q1 includes, but is not limited to, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). There is no particular limitation on the specific model of the MOSFET selected here.

[0064] In some embodiments, the controllable switch module 2 further includes a diode D1;

[0065] The anode of diode D1 is connected to the first terminal of controllable switch Q1, and the cathode is connected to the second terminal of controllable switch Q1.

[0066] Specifically, diode D1 is used for freewheeling to provide a freewheeling path for controllable switch Q1, ensuring the safe operation of controllable switch Q1.

[0067] In some embodiments, the controllable switch module 2 further includes a second resistor R4;

[0068] One end of the second resistor R4 is connected to the control terminal of the controllable switch Q1, and the other end is connected to the second terminal of the controllable switch Q1.

[0069] Specifically, the second resistor R4 is used to ensure the safe operation of the controllable switch Q1. There are no special restrictions on the specific resistance value of the second resistor R4; it can be selected according to actual needs.

[0070] Please refer to Figure 4 , Figure 4This is a schematic diagram of the structure of a device to be charged according to the present invention.

[0071] The device to be charged includes a USB interface 1, a control module 6, a battery and a battery management module 5, and also includes a USB interface anti-burn device 7 as described above, wherein the control module 6 constitutes the processor in the USB interface anti-burn device 7.

[0072] USB interface 1 is used for plugging and unplugging the USB connector of the charging device, and the USB connector is connected to the power bus of the device to be charged after being plugged in; the charging device is used to control the power output according to the detected level at the USB connector.

[0073] The battery, battery management module 5, and control module 6 are connected in sequence. The control module 6 is also connected to the controllable switch module 2 and temperature detection module 3 in the USB interface burn-out prevention device 7.

[0074] For a description of the device to be charged provided in this application, please refer to the above-described embodiment of the USB interface anti-burn device; it will not be repeated here.

[0075] In some embodiments, a display module 8 is also included;

[0076] The display module 8 is connected to the control module 6 and is used to display the result of the short circuit of the USB interface 1 when the USB interface 1 is short-circuited, and / or to receive and display the processing prompt information corresponding to the short circuit sent by the control module 6.

[0077] In this embodiment, the display module 8 can be a display screen. Specifically, the display method for the result of the USB interface 1 being short-circuited can be in the form of a notification bar message, a pop-up message, a screen flashing, or a USB interface 1 short-circuit icon. No particular limitation is made here. The processing prompt information can be information that instructs the user to stop charging immediately, or information that reminds the user to avoid touching the short-circuited USB interface 1 and the charging device to prevent electric shock and other dangerous situations. No particular limitation is made here, and it can be flexibly set according to actual needs.

[0078] As can be seen, the above settings, by clearly informing users that a short circuit has occurred at USB interface 1, help users to promptly understand the current fault situation and take timely measures to avoid potential safety risks from continued use. Furthermore, the processing prompts provide users with safe operating instructions, avoiding safety risks caused by improper operation, and are more conducive to practical applications.

[0079] In some embodiments, a voice prompt module 9 is also included;

[0080] The voice prompt module 9 is connected to the control module 6 and is used to make a voice broadcast when the USB interface 1 is short-circuited, and / or receive and broadcast the processing prompt information corresponding to the short circuit sent by the control module 6.

[0081] In this embodiment, the voice prompt module 9 can be a speaker; specifically, voice broadcasting helps users obtain information about a short circuit in the USB interface 1 more intuitively; similarly, the processing prompt information can be information that reminds users to avoid touching the short-circuited USB interface 1 and charging device to prevent dangerous situations such as electric shock. There are no special limitations here, and it can be flexibly set according to actual needs.

[0082] In some embodiments, a storage module 10 is also included;

[0083] The storage module 10 is connected to the control module 6 and is used to record the result of a short circuit in the USB interface 1.

[0084] In this embodiment, the storage module 10 can be a memory that records the result of the USB interface 1 short circuit, which is beneficial for subsequent fault analysis and location. Specifically, it can also record the time of the USB interface 1 short circuit, the model of the connected charging device, the current and voltage at the time of the short circuit, etc., without any particular limitation. In addition, the recorded information can be sent to the upper-level server so that the upper-level management technicians can know the fault situation in time, which is beneficial for subsequent fault analysis. The recorded information can also be sent to the monitoring device associated with the device to be charged so that the monitoring personnel can know the situation in time. The monitoring personnel here are the people using the monitoring device, such as parents.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

[0087] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A USB interface anti-burn device, characterized in that, It is applied to a device to be charged with a USB interface; the USB interface is used for plugging and unplugging the USB connector of the charging device, and the USB connector is connected to the power bus of the device to be charged after being plugged in; the charging device is used to control the power output according to the detected level at the USB connector; the USB interface anti-burn device includes a controllable switch module, a temperature detection module, and a processor constituting the control module of the device to be charged; The temperature detection module is connected to the USB interface and the processor respectively, and is used to detect the temperature of the USB interface and send it to the processor; The first terminal of the controllable switch module is connected to the power bus of the device to be charged, the second terminal is grounded, and the control terminal is connected to the processor; the processor is also connected to the battery management module in the device to be charged, and the battery management module is used to detect the temperature of the battery in the device to be charged; The processor is used to control the controllable switch module to turn on when the USB interface is short-circuited, so that the charging device stops outputting power, and to control the controllable switch module to turn off when the USB interface is not short-circuited, so that the charging device outputs power.

2. The USB interface anti-burn device as described in claim 1, characterized in that, The temperature detection module includes a first resistor and a thermistor, and the temperature sensing surface of the thermistor is fitted to the outer shell of the USB interface. One end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to one end of the thermistor and the sampling terminal of the processor; the other end of the thermistor is grounded.

3. The USB interface anti-burn device as described in claim 1, characterized in that, It also includes a current-limiting resistor; The current-limiting resistor is connected in series with the controllable switch module, and one end of the series circuit is connected to the power bus of the device to be charged, while the other end of the series circuit is grounded.

4. The USB interface anti-burn device as described in any one of claims 1 to 3, characterized in that, The controllable switch module includes a controllable switch; The first end of the controllable switch serves as the first end of the controllable switch module, the second end serves as the second end of the controllable switch module, and the control end serves as the control end of the controllable switch module.

5. The USB interface anti-burn device as described in claim 4, characterized in that, The controllable switch module also includes diodes; The anode of the diode is connected to the first terminal of the controllable switch, and the cathode is connected to the second terminal of the controllable switch.

6. The USB interface anti-burn device as described in claim 4, characterized in that, The controllable switch module also includes a second resistor; One end of the second resistor is connected to the control terminal of the controllable switch, and the other end is connected to the second terminal of the controllable switch.

7. A device to be charged, characterized in that, It includes a USB interface, a control module, a battery and a battery management module, and also includes a USB interface anti-burn device as described in any one of claims 1 to 6, wherein the control module constitutes a processor in the USB interface anti-burn device; The USB interface is used for plugging and unplugging the USB connector of the charging device, and the USB connector is connected to the power bus of the device to be charged after being plugged in; the charging device is used to control the power output according to the detected level at the USB connector. The battery, the battery management module, and the control module are connected in sequence. The control module is also connected to the controllable switch module and the temperature detection module in the USB interface burn-out prevention device.

8. The device to be charged as described in claim 7, characterized in that, It also includes a display module; The display module is connected to the control module and is used to display the result of the USB interface short circuit when the USB interface is short-circuited, and / or receive and display the processing prompt information corresponding to the short circuit sent by the control module.

9. The device to be charged as described in claim 7, characterized in that, It also includes a voice prompt module; The voice prompt module is connected to the control module and is used to make a voice broadcast when the USB interface is short-circuited, and / or receive and broadcast the processing prompt information corresponding to the short circuit sent by the control module.

10. The device to be charged as described in claim 7, characterized in that, It also includes a storage module; The storage module is connected to the control module and is used to record the result of a short circuit in the USB interface.

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