A charging protection method, a power receiving device, and a charging device

Abstract

The application provides a charging protection method, a power receiving device and a charging device. The method comprises the following steps: sampling a charging current of a charging loop to obtain a current sampling signal within a preset time period after detecting the charging current of the charging loop; performing quantization coding on the current sampling signal to obtain a current coding value; judging whether the current coding value is consistent with a preset current coding value; and disconnecting the charging loop in the case that the current coding value is inconsistent with the preset current coding value. According to the current change rule within a period of time after starting charging, the charging device is identified, the case of using a wrong charging device is found in time, the possibility of damaging the power receiving device is effectively reduced, and the occurrence of safety accidents is reduced.

Description

Technical Field

[0001] This application relates to the field of battery charging technology, and in particular to a charging protection method, a power receiving device, and a charging device. Background Technology

[0002] Different types and voltage levels of rechargeable batteries typically require their own compatible chargers to ensure charging safety. The methods used in related technologies to ensure charger-battery compatibility generally include the following:

[0003] 1. The charging device and the receiving device are equipped with compatible and unconventional physical interfaces, each unconventional physical interface being used to adapt to a suitable charging device and receiving device. However, this method results in a wide variety of physical interfaces used between the charging device and the receiving device, making standardization difficult.

[0004] 2. The charging device and the receiving device establish a communication connection using a communication bus, such as a RS485 bus or a CAN bus. Before charging, they exchange information via the communication bus to determine if the charging device and the receiving device are compatible. This method requires communication chips to be configured on both the charging device and the receiving device, increasing manufacturing costs.

[0005] 3. The receiving device determines whether the charging device is compatible with itself by detecting the charging voltage in the charging circuit.

[0006] Figure 1 This is a schematic diagram of a charging system in the prior art that does not employ a communication bus. For example... Figure 1 As shown, the charging device 10 and the receiving device 20 are electrically connected to form a charging circuit. The receiving device 20 includes: a rechargeable battery 21, a battery management system (BMS) 22, a charging switch 23, and a charging voltage acquisition unit 24.

[0007] Figure 2 This is a graph showing the changes in charging voltage and charging current over time during the charging process in existing technologies, such as... Figure 2As shown, when the charging device 10 charges the receiving device 20, the charging voltage provided by the charging device 10 to the charging circuit does not directly reach the maximum charging voltage of the rechargeable battery 21. Instead, it increases over time until the rechargeable battery 21 is almost fully charged, at which point the charging voltage remains constant near the maximum charging voltage. Therefore, when an incompatible charging device 10 is used to charge the receiving device 20, even if the maximum charging voltage that the charging device 10 can ultimately provide is greater than the voltage threshold of the rechargeable battery 21, the charging voltage detected by the BMS 22 of the receiving device 20 will not exceed the voltage threshold of the rechargeable battery 21 for a period of time at the beginning of charging (more than 20 minutes). Therefore, the BMS 22 will not immediately cut off the charging circuit. However, when the rechargeable battery 21 is close to fully charged, the charging voltage output by the charging device 10 may continue to increase, potentially causing the rechargeable battery 21 to catch fire or other malfunctions due to excessive voltage. In addition, even if the BMS 22 can cut off the charging circuit when the charging voltage provided by the charging device 10 is too high, if there is no manual intervention, when the BMS 22 resets the charging circuit, that is, when the charging circuit is reconnected, the charging battery 21 will be connected to the excessive charging voltage again, which will cause the life of the charging battery 21 to decrease rapidly. Summary of the Invention

[0008] To address the issue of reduced battery life caused by incompatibility between charging equipment and receiving equipment, embodiments of this application provide a charging protection method, a receiving equipment, and a charging equipment.

[0009] In a first aspect, embodiments of this application provide a charging protection method applied to a powered device. The method includes: sampling the charging current of the charging circuit within a preset time period after detecting the charging current of the charging circuit to obtain a current sampling signal; quantizing and encoding the current sampling signal to obtain a current encoding value; determining whether the current encoding value is consistent with a preset current encoding value; and disconnecting the charging circuit if the current encoding value is inconsistent with the preset current encoding value.

[0010] In some embodiments, the method further includes: determining whether the fluctuation range of the current sampling signal exceeds a preset range, or determining whether each bit of the current encoding value is the same; and disconnecting the charging circuit if the fluctuation range of the current sampling signal does not exceed the preset range, or if each bit of the current encoding value is the same.

[0011] In some embodiments, the current sampling signal is sampled within a portion or all of the preset time period; wherein, determining whether the current encoding value is consistent with the preset current encoding value includes: when the current sampling signal is sampled within a portion of the preset time period, determining whether the current encoding value is consistent with the first portion of the preset current encoding value.

[0012] In some embodiments, the preset time period is less than or equal to ten minutes.

[0013] In some embodiments, the maximum value of the charging current of the charging circuit during the preset time period is less than or equal to one-third of the maximum charging current that the charging device can provide to the charging circuit.

[0014] In some embodiments, after disconnecting the charging circuit, the method further includes: reconnecting the charging circuit based on a control command input by the user and / or after a preset delay.

[0015] Secondly, embodiments of this application provide a charging protection method applied to a charging device. The method includes: providing a first charging current to the charging circuit of the powered device within a preset time period after connecting the powered device, wherein the first charging current is used to characterize a first preset current encoding value, the first preset current encoding value corresponding to the model and / or operating mode of the charging device; detecting whether the charging circuit is disconnected within the preset time period; and if the charging circuit is not disconnected within the preset time period, providing a second charging current to the charging circuit, wherein the second charging current is used to charge the powered device normally.

[0016] In some embodiments, the charging device's operating modes include at least a first charging mode and a second charging mode. In the first charging mode, the charging device can provide a second charging current, corresponding to a first preset current encoding value. In the second charging mode, the charging device can provide a third charging current for normal charging of the powered device, corresponding to a second preset current encoding value. The method further includes: if the charging circuit is disconnected within a preset time period, switching the charging device's operating mode to the second charging mode; providing a fourth charging current to the charging circuit within a preset time period after the charging circuit is reconnected, wherein the fourth charging current characterizes the second preset current encoding value; and providing the third charging current to the charging circuit if the charging circuit is not disconnected within the preset time period.

[0017] In some embodiments, the preset time period is less than or equal to ten minutes.

[0018] In some embodiments, the maximum value of the first charging current and the fourth charging current is less than or equal to one-third of the maximum charging current that the charging device can provide to the charging circuit.

[0019] Thirdly, embodiments of this application provide a power receiving device, the power receiving device comprising: an energy storage module and a control module; the energy storage module is connected to a charging device via a charging circuit, and the control module comprises a sampling unit, a data processing unit, and an on / off control unit, wherein the sampling unit is used to sample the charging current of the charging circuit within a preset time period after detecting the charging current of the charging circuit to obtain a current sampling signal; the data processing unit is used to quantize and encode the current sampling signal to obtain a current encoded value, and to determine whether the current encoded value is consistent with a preset current encoded value; the on / off control unit is used to disconnect the charging circuit if the current encoded value is inconsistent with the preset current encoded value.

[0020] Fourthly, this application provides a charging device, comprising: a charging module and a detection module; wherein, the charging module is configured to provide a first charging current to the charging circuit of the powered device within a preset time period after connecting the powered device, wherein the first charging current is used to characterize a first preset current encoding value, the first preset current encoding value corresponding to the model and / or operating mode of the charging device; the detection module is configured to detect whether the charging circuit is disconnected within the preset time period; the charging module is further configured to provide a second charging current to the charging circuit if the charging circuit is not disconnected within the preset time period, wherein the second charging current is used to normally charge the powered device.

[0021] The charging protection method, the receiving device, and the charging device provided in this application enable the identification of the charging device, which helps to avoid problems such as overcharging and fire or rapid reduction in the life of the rechargeable battery caused by incompatibility between the charging device and the receiving device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a charging system that does not use a communication bus in the prior art;

[0023] Figure 2 It is a graph showing the changes in charging voltage and charging current over time during the charging process in the prior art;

[0024] Figure 3 This is a schematic diagram of the charging system provided in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the power receiving device 40 provided in the embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of the charging device 50 provided in the embodiments of this application;

[0027] Figure 6 This is a flowchart of a charging protection method for powered devices provided in an embodiment of this application;

[0028] Figure 7 This is a flowchart of a charging protection method for charging equipment provided in an embodiment of this application;

[0029] Figure 8 This is a graph showing the change of charging current over time when a charging device adapted to the powered device is used in an embodiment of this application. Detailed Implementation

[0030] To better understand the purpose, technical solutions, and advantages of this application, it has been described and illustrated below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that this application can be implemented without these details. In some cases, to avoid obscuring various aspects of this application due to unnecessary description, well-known methods, processes, systems, components, and / or circuits already described at a higher level will not be elaborated upon. It will be apparent to those skilled in the art that various modifications can be made to the embodiments disclosed in this application, and the general principles defined in this application can be applied to other embodiments and application scenarios without departing from the principles and scope of this application. Therefore, this application is not limited to the illustrated embodiments, but conforms to the broadest scope consistent with the scope of protection claimed in this application.

[0031] Unless otherwise defined, the technical or scientific terms used in this application should have the general meaning understood by one of ordinary skill in the art to which this application pertains. The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the application. Words such as “a,” “an,” “an,” “the,” “the,” and “these,” as used in this application, do not indicate quantitative limitations and can be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion.

[0032] In this application, "multiple" refers to two or more. The terms "first," "second," "third," etc., used in this application are merely for distinguishing similar objects and do not represent a specific order of the objects.

[0033] The terms "system," "engine," "unit," "module," and / or "block" used in this application are a method of distinguishing different components, elements, parts, components, assemblies, or functions at different levels. These terms may be replaced by other expressions that achieve the same purpose. Generally, "module," "unit," or "block" as used in this application refers to a collection of logical or software instructions embodied in hardware or firmware. The "modules," "units," or "blocks" described in this application can be implemented as software and / or hardware, and in the case of a software implementation, they can be stored in any type of non-volatile computer-readable storage medium or storage device.

[0034] In some embodiments, software modules / units / blocks may be compiled and linked into an executable program. It will be appreciated that software modules may be invoked from other modules / units / blocks or from themselves, and / or may be invoked in response to detected events or interruptions. Software modules / units / blocks configured to execute on a computing device may be located on computer-readable storage media, such as optical discs, digital video discs, flash drives, hard disks, or any other tangible media, or as digital downloads (and may be initially stored in a compressed or installable format that requires installation, decompression, or decryption prior to execution). Such software code may be stored, partially or wholly, on the storage device of the executing computing device and applied in the operation of the computing device. The modules / units / blocks or computing device functionalities described herein may be implemented as software modules / units / blocks, or may be represented in hardware or firmware. Typically, the modules / units / blocks described herein may be combined with other modules / units / blocks, or, although physically organized or stored, may be divided into submodules / subunits / subblocks. This description may apply to a system, an engine, or a portion thereof.

[0035] Figure 3 This is a schematic diagram of the charging system provided in an embodiment of this application, such as... Figure 3 As shown, the charging system provided in this embodiment includes a power receiving device 40 and a charging device 50.

[0036] Figure 4 This is a schematic diagram of the structure of the power receiving device 40 provided in the embodiments of this application, as shown below. Figure 4 As shown, the power receiving device 40 includes an energy storage module 41 and a control module 42, wherein the energy storage module 41 is electrically connected to the charging device 50 through a charging circuit. The control module 42 includes a sampling unit 421, a data processing unit 422, and an on / off control unit 423.

[0037] The sampling unit 421 is electrically connected to the charging circuit and is used to sample the charging current of the charging circuit within a preset time period after detecting the charging current of the charging circuit to obtain a current sampling signal. A sampling resistor is connected in series on the charging line. The sampling unit 421 detects the voltage value across the sampling resistor and then calculates the current value on the charging line based on Ohm's law, which is the charging current of the charging circuit.

[0038] The data processing unit 422 is electrically connected to the sampling unit 421 and the on / off control unit 423, respectively, and is used to quantize and encode the current sampling signal to obtain the current encoded value, and to determine whether the current encoded value is consistent with the preset current encoded value.

[0039] The on / off control unit 423 includes an on / off controller and an electronically controlled switch. The electronically controlled switch is connected in series in the charging line, and the on / off controller controls the switching state of the electronically controlled switch to disconnect or connect the charging circuit. The on / off control unit 423 is used to disconnect the charging circuit when the data processing unit 422 determines that the current encoding value is inconsistent with the preset current encoding value. The aforementioned electronically controlled switch includes, but is not limited to, relays, transistors, MOSFETs, thyristors, or other electrically controllable switching devices. After the charging circuit is disconnected, the on / off control unit 423 can also connect the charging circuit based on user-input control commands and / or after a preset delay.

[0040] As a preferred implementation method, the sampling unit, data processing unit and on / off control unit mentioned above can be based on the BMS of the powered equipment, and implemented by adding corresponding components (such as sampling resistors) and software programs within the BMS.

[0041] In some embodiments, the data processing unit 422 is further configured to determine whether the fluctuation range of the current sampling signal exceeds a preset range, or to determine whether each bit of the current encoding value is the same. The on / off control unit 423 is further configured to disconnect the charging circuit if the fluctuation range of the current sampling signal does not exceed the preset range, or if each bit of the current encoding value is the same.

[0042] In some embodiments, the current sampling signal is sampled within a portion or all of a preset time period. When the current sampling signal is sampled within a portion of the preset time period, the data processing unit 422 determines whether the current encoded value is consistent with the first portion of the preset current encoded value.

[0043] In some embodiments, the aforementioned preset time period can be set by a timer, the duration of which is less than or equal to ten minutes.

[0044] In some embodiments, the maximum value of the charging current of the charging circuit within a preset time period is less than or equal to one-third of the maximum charging current that the charging device 50 can provide to the charging circuit.

[0045] Corresponding to the power receiving device described above, this embodiment also provides a charging device. Figure 5 This is a schematic diagram of the structure of the charging device 50 provided in the embodiments of this application, as shown below. Figure 5 As shown, the charging device 50 includes a charging module 51 and a detection module 52. The charging module 51 is electrically connected to the detection module 52, and the charging module 51 is also electrically connected to the receiving device 40 during charging to form a charging circuit.

[0046] The charging module 51 is used to provide a first charging current to the charging circuit of the powered device 40 within a preset time period during which the device is connected to the powered device 40. The first charging current is used to characterize a first preset current code value, which corresponds to the model and / or operating mode of the charging device.

[0047] The detection module 52 is used to detect whether the charging circuit is disconnected within a preset time period. The detection module 52 can detect whether the charging circuit is disconnected based on the charging current of the charging circuit. When the charging current is detected to be zero, it indicates that the charging circuit has been disconnected.

[0048] The charging module 51 is also used to provide a second charging current to the charging circuit if the charging circuit is not disconnected within a preset time period. The second charging current is used to charge the powered device 40 normally.

[0049] In some embodiments, the charging device 50 may further include a switching module. The operating modes of the charging device 50 include at least a first charging mode and a second charging mode. The first charging mode and the second charging mode may be implemented by the same charging module 51 or by multiple charging modules 51 respectively. Different charging modes may correspond to the same or different charging modules; that is, different charging modes may be implemented by the same or different charging modules. The charging mode is distinguished by at least one of the following attributes: the range of charging current variation, the range of charging voltage variation, the charging method, etc. The charging method, depending on the characteristics of the powered device 40, includes, but is not limited to, constant current charging, constant voltage charging, and staged charging. Staged charging is further divided into a two-stage charging method (first constant current charging to a predetermined voltage value, then constant voltage charging to complete the charging), and a three-stage charging method (first constant current charging, then constant voltage charging, and finally constant current trickle charging).

[0050] In the above embodiments, the charging device can provide a second charging current in the first charging mode, the first charging mode corresponding to a first preset current encoding value. In the second charging mode, the charging device can provide a third charging current for normal charging of the powered device, the second charging mode corresponding to a second preset current encoding value. The switching module is electrically connected to the detection module 52 and each charging module 51, and is used to switch the operating mode of the charging device 50 to the second charging mode when the charging circuit is disconnected within a preset time period. The charging module 51 is also used to provide a fourth charging current to the charging circuit within a preset time period after the charging circuit is reconnected, wherein the fourth charging current is used to characterize the second preset current encoding value. Furthermore, the charging module 51 is also used to provide a third charging current to the charging circuit when the charging circuit is not disconnected within the preset time period.

[0051] In some of these embodiments, the aforementioned preset time period is also implemented by a timer, the duration of which is less than or equal to ten minutes.

[0052] In some embodiments, the maximum values ​​of the first charging current and the fourth charging current are less than or equal to one-third of the maximum charging current that the charging device 50 can provide to the charging circuit.

[0053] The embodiments of this application will now be described and illustrated in conjunction with the method embodiments.

[0054] Based on the above-described power receiving equipment and charging equipment, this embodiment provides a charging protection method, which is applied to the power receiving equipment. Figure 6 This is a flowchart of the charging protection method provided in the embodiments of this application, such as... Figure 6 As shown, the method includes the following steps:

[0055] Step S601: Within a preset time period after detecting the charging current, the powered device samples the charging current of the charging circuit to obtain a current sampling signal.

[0056] In step S602, the power receiving device quantizes and encodes the current sampling signal to obtain the current coded value.

[0057] Step S603: The power receiving device determines whether the current code value is consistent with the preset current code value.

[0058] In step S604, if the current encoding value is inconsistent with the preset current encoding value, the powered device disconnects the charging circuit.

[0059] Through the above steps, the receiving device detects the charging current in the existing charging circuit, thus eliminating the need for an additional communication bus and saving costs. Unlike related technologies that determine whether the charging voltage provided by the charging device is too high by detecting the charging voltage, the receiving device in this embodiment determines whether the charging device is compatible with the receiving device based on the current encoding value represented by the current sampling signal. If the current encoding value represented by the current sampling signal is inconsistent with the preset current encoding value in the receiving device, it indicates that the charging device and the receiving device are incompatible. In this case, the receiving device disconnects the charging circuit to avoid overcharging, fire, or rapid reduction in the lifespan of the receiving device due to incompatibility.

[0060] In this process, when a charging device compatible with the receiving device is used, the charging device does not directly perform normal charging within a preset time period after connecting to the receiving device. Instead, it provides an analog current signal that varies according to a certain current encoding value to the charging circuit within the preset time period to identify itself to the receiving device, or to indicate the charging mode or model it supports. If the charging device cannot provide an analog current signal according to the preset current encoding value within the preset time period after connecting to the receiving device—for example, in related technologies, ordinary charging devices directly use staged charging or other charging methods to the receiving device when there is no communication bus—even if the charging signal provided by the charging device matches the receiving device, or the charging mode of the charging device is applicable to the receiving device, the receiving device cannot recognize the identity information of the charging device. Therefore, the receiving device can still consider the charging device incompatible with itself, thereby minimizing the possibility of misuse of the charging device.

[0061] For traditional charging devices, such as those that charge directly with a constant current after connecting to a powered device, if the powered device samples the charging current supplied by the device, the fluctuation range of the current sampling signal may far exceed a preset range. This preset range could be, for example, the maximum variation range of an analog current signal that changes according to a preset current encoding value. Alternatively, when using constant current charging, each bit of the current encoding value obtained after sampling and quantizing the charging current supplied by the traditional charging device may be the same value, meaning the charging current has almost no fluctuation. Both of these scenarios indicate that the charging device and the powered device are not compatible. In this case, steps S602 or S603 can be skipped, and the charging circuit can be directly disconnected, thereby simplifying the detection steps for the charging device and improving detection efficiency.

[0062] Similarly, in some embodiments, to improve detection efficiency, it is also possible to detect in real time whether each bit of the current encoding value corresponding to the charging current within the aforementioned preset time period is consistent with the preset current encoding value. Once at least one bit of the current encoding value is detected to be inconsistent, step S604 is executed directly without further comparison of the current encoding values ​​of subsequent bits. Therefore, in some embodiments, the current sampling signal used for quantization encoding and comparison each time is not limited to the current sampling signals sampled in all time periods within the preset time period, but can be the current sampling signal corresponding to at least one bit of the current encoding value sampled in the first part of the preset time period. When the current sampling signal is sampled in the first part of the preset time period, in step S603, the powered device determines whether the current encoding value is consistent with the first part corresponding to the preset current encoding value.

[0063] For example, taking the preset current encoding value as "4423565", the current sampling signal can sample one or more current encoding values ​​for a duration each time, and determine the corresponding current encoding value through quantization encoding. For example, if the current encoding value "44" is obtained by sampling and quantization encoding, which is the same as the first two bits of the preset current encoding value, then sampling and quantization continue; however, if the current encoding value "25" is obtained by sampling and quantization encoding, which is different from the third and fourth bits "23" in "4423565", then the sampling and quantization encoding of the subsequent charging current can be stopped immediately, and step S604 can be executed directly.

[0064] In some embodiments, the aforementioned preset time period is less than or equal to ten minutes to ensure that the detection time for determining whether the charging device is compatible is minimized while improving identification accuracy. For the charging device, a simple scenario involves directly mapping the current code value to the charging device's model number, and conventional model codes are typically ten or more digits long. A more complex scenario uses different digits of the current code value to map different performance parameters of the charging device, and the current code value is also typically ten or more digits long. Since the speed and accuracy of adjusting the charging current are difficult to achieve with high precision, in this embodiment, the time interval corresponding to each current code value can be set to more than 10 seconds. Simultaneously, the current sampling rate can be appropriately increased to avoid errors in current code value identification due to untimely changes in the charging current.

[0065] After the charging circuit is disconnected, the receiving device will reset the charging circuit. This means the receiving device will reconnect the charging circuit at an appropriate time based on some method, ensuring that the receiving device can be charged after the charging device is replaced. The reset method can be manual or automatic. For example, the receiving device can provide a reset button. After the charging circuit is disconnected, the user can press the reset button, which will give the receiving device a control command to reset the charging circuit. The receiving device will then reconnect the charging circuit based on this control command to achieve the reset. Alternatively, the reset button can be linked to the physical interface used for charging. Each time the charging device is plugged in or unplugged, the receiving device will reset the charging circuit to ensure that the charging circuit is reset promptly after the charging device is replaced. The receiving device can also be set with a preset delay for reset, such as ten minutes, half an hour, or one hour. After the preset delay is reached, the receiving device will automatically reconnect the charging circuit to achieve the reset. Furthermore, the above-mentioned manual and automatic reset methods can also be used in combination.

[0066] In some embodiments, the powered device can also adjust the preset delay of the reset based on the insertion and removal status of the charging device and the number of times the charging circuit is reset in the current charging event. For example, if the charging device is not inserted or removed and the charging circuit is reset multiple times in the current charging event, it can be considered that the current charging device is not compatible with the powered device and there is no manual intervention. In order to protect the powered device, the preset delay of the next reset will be increased, or even reset will no longer be allowed, that is, the preset delay will be infinite until the user intervention is detected and then the initial preset delay will be restored.

[0067] Because the charging circuit of the powered device may be reset multiple times, when a powered device is connected to an incompatible charging device, the charging device will provide a simulated charging current corresponding to the current encoding value to the charging circuit after each reset. Therefore, if these simulated charging currents are too large, the powered device may still be overcharged or damaged by these simulated charging currents. Therefore, in this embodiment, the maximum value of the charging current of the charging circuit within a preset time period is set to be less than or equal to one-third of the maximum charging current that the charging device can provide to the charging circuit. To ensure the recognizability of the simulated charging current sampled by the powered device, in the case of larger capacity powered devices such as electric bicycles, the minimum charging current of the charging circuit within the preset time period is usually greater than 1A.

[0068] Based on the above-described power receiving and charging equipment, this embodiment provides a charging protection method, which is applied to the charging equipment. Figure 7 This is a flowchart of the charging protection method provided in the embodiments of this application, such as... Figure 7 As shown, the method includes the following steps:

[0069] Step S701: Within a preset time period after connecting to the powered device, the charging device provides a first charging current to the charging circuit of the powered device, wherein the first charging current is used to characterize a first preset current code value, and the first preset current code value corresponds to the model and / or operating mode of the charging device.

[0070] Step S702: The charging device detects whether the charging circuit is disconnected within a preset time period.

[0071] In step S703, if the charging circuit is not disconnected within a preset time period, the charging device provides a second charging current to the charging circuit, wherein the second charging current is used to charge the powered device normally.

[0072] Through the above steps, a communication bus is not required between the receiving device and the charging device. Instead, a charging circuit is used to transmit information by simulating charging current. When the charging device provides a first charging current to the charging circuit of the receiving device to characterize a first preset current code value, if the model and / or operating mode of the charging device is incompatible with the receiving device, the receiving device will disconnect the charging circuit. Therefore, by detecting whether the charging circuit is disconnected within a preset time period, the charging device can determine whether its model and / or operating mode is compatible with the receiving device. If compatible, the charging device provides a second charging current to the charging circuit for normal charging of the receiving device after the preset time period, thereby avoiding overcharging, fire, or rapid reduction in lifespan caused by directly charging the receiving device due to incompatibility.

[0073] The above-mentioned normal charging refers to charging the device according to a preset charging method to fully charge the device's battery.

[0074] In some embodiments, the operating modes of the charging device include at least a first charging mode and a second charging mode. In the first charging mode, the charging device can provide a second charging current, and the first charging mode corresponds to a first preset current encoding value. In the second charging mode, the charging device can provide a third charging current for normal charging of the powered device, and the second charging mode corresponds to a second preset current encoding value.

[0075] After step S702, the above-described charging protection method may further include the following steps:

[0076] In step S704, if the charging circuit is disconnected within a preset time period, the charging device will switch its operating mode to the second charging mode.

[0077] In step S705, within a preset time period after the charging circuit is reconnected, the charging device provides a fourth charging current to the charging circuit, wherein the fourth charging current is used to characterize the second preset current encoding value.

[0078] In step S706, if the charging circuit is not disconnected within a preset time period, the charging device provides a third charging current to the charging circuit.

[0079] In some of these embodiments, the preset time period is less than or equal to ten minutes.

[0080] In some embodiments, the maximum value of the first charging current and the fourth charging current is less than or equal to one-third of the maximum charging current that the charging device can provide to the charging circuit.

[0081] Figure 8 This is a graph showing the change of charging current over time when a charging device adapted to the powered device is used in an embodiment of this application. Figure 8 As shown, during a preset time period after charging begins, the charging current maintains a low value and exhibits predetermined coding characteristics. After the preset time period, the charging device and the powered device confirm mutual compatibility. Figure 8 In the charging method shown, the charging current reaches its maximum value and remains constant to achieve constant current charging. After a period of time, the charging voltage ( Figure 8 (Not shown) Constant voltage charging is achieved by keeping the charging current constant while gradually decreasing it; finally, trickle charging is achieved by using a very small charging current until the device is fully charged.

[0082] In summary, the charging protection method, the powered device, and the charging device provided in this application embodiment identify whether the current charger model is compatible with the powered device based on the changing pattern of the charging current for a period of time after charging begins. If incompatible, charging is promptly disconnected to prevent overcharging and fire. This embodiment solves the problem that existing methods for avoiding safety accidents caused by using the wrong charger have limited effectiveness and cannot effectively reduce the possibility of damage to the powered device. By comparing the corresponding current code value obtained from the current change pattern with the preset current code value of the powered device, a conclusion is drawn as to whether the charging device is compatible, avoiding the use of the wrong charger, thereby ensuring charging safety and maintaining the service life of the powered device.

[0083] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0084] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0085] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A charging protection method applied to a powered device, characterized in that, The method comprises: sampling the charging current of the charging circuit to obtain a current sampling signal within a preset time period after detecting the charging current of the charging circuit, wherein the fluctuation range and timing characteristics of the current sampling signal are used to reflect the working mode of the charging device; quantizing and encoding the current sampling signal to obtain a current encoding value; determining whether the current encoding value is consistent with a preset current encoding value; in the case that the current encoding value is not consistent with the preset current encoding value, disconnecting the charging circuit; wherein the current sampling signal is sampled within a part or all of the preset time period; wherein determining whether the current encoding value is consistent with a preset current encoding value includes: in the case that the current sampling signal is sampled within a part of the preset time period, determining whether the current encoding value is consistent with a part of the preset current encoding value.

2. The charge protection method of claim 1, wherein, The method further comprises: determining whether the fluctuation range of the current sampling signal exceeds a preset range, or determining whether each bit value of the current encoding value is the same; in the case that the fluctuation range of the current sampling signal does not exceed the preset range, or each bit value of the current encoding value is the same, disconnecting the charging circuit.

3. The charge protection method of claim 1, wherein, The duration of the preset time period is less than or equal to ten minutes.

4. The charge protection method of claim 1, wherein, The maximum value of the charging current of the charging circuit within the preset time period is less than or equal to one third of the maximum charging current that the charging device can provide for the charging circuit.

5. The charge protection method according to any one of claims 1 to 4, characterized by, After disconnecting the charging circuit, the method further comprises: based on the user input control instruction and / or after a preset delay, connecting the charging circuit.

6. A charge protection method applied to a charging device, characterized in that, The method comprises: within a preset time period after connecting the powered device, providing a first charging current to the charging circuit of the powered device, wherein the first charging current is used to represent a first preset current encoding value, and the first preset current encoding value corresponds to the model and / or working mode of the charging device; detecting whether the charging circuit is disconnected within the preset time period; in the case that the charging circuit is not disconnected within the preset time period, providing a second charging current to the charging circuit, wherein the working mode of the charging device at least includes a first charging mode and a second charging mode, and the second charging current is used to normally charge the powered device adapted to the first charging mode; the charging device can provide a third charging current for normally charging the powered device in the second charging mode, and the second charging mode corresponds to a second preset current encoding value; wherein the method further comprises: in the case that the charging circuit is disconnected within the preset time period, switching the working mode of the charging device to the second charging mode; within a preset time period after reconnecting the charging circuit, providing a fourth charging current to the charging circuit, wherein the fourth charging current is used to represent the second preset current encoding value; in the case that the charging circuit is not disconnected within the preset time period after reconnecting, providing the third charging current to the charging circuit.

7. A power receiving device characterized by comprising: The power receiving device comprises an energy storage module and a control module; the energy storage module is connected with the charging device through a charging circuit, and the control module comprises a sampling unit, a data processing unit and a on-off control unit, wherein The sampling unit is configured to sample the charging current of the charging circuit within a preset time period after detecting the charging current of the charging circuit, to obtain a current sampling signal, wherein the fluctuation range and timing characteristics of the current sampling signal are used to reflect the working mode of the charging device; The data processing unit is configured to quantitatively encode the current sampling signal to obtain a current encoding value, and judge whether the current encoding value is consistent with a preset current encoding value; The on-off control unit is configured to disconnect the charging circuit when the current encoding value is inconsistent with the preset current encoding value; The current sampling signal is sampled within a part or all of the preset time period; wherein The judgment of whether the current encoding value is consistent with the preset current encoding value comprises: judging whether the current encoding value is consistent with a part of the preset current encoding value when the current sampling signal is sampled within a part of the preset time period.

8. A charging device, characterized by The charging device comprises a charging module and a detection module; wherein The charging module is configured to provide a first charging current to the charging circuit of the power receiving device within a preset time period after connecting the power receiving device, wherein the first charging current is used to represent a first preset current encoding value, and the first preset current encoding value corresponds to the model and / or working mode of the charging device; The detection module is configured to detect whether the charging circuit is disconnected within the preset time period; The charging module is further configured to provide a second charging current to the charging circuit when the charging circuit is not disconnected within the preset time period, wherein the working mode of the charging device at least comprises a first charging mode and a second charging mode, and the second charging current is used to normally charge the power receiving device adapted to the first charging mode; The charging device can provide a third charging current for normally charging the power receiving device in the second charging mode, and the second charging mode corresponds to a second preset current encoding value; wherein further comprising: In the case that the charging circuit is disconnected within the preset time period, the working mode of the charging device is switched to the second charging mode; Within a preset time period after the charging circuit is reconnected, a fourth charging current is provided to the charging circuit, wherein the fourth charging current is used to represent the second preset current encoding value; In the case that the charging circuit is not disconnected within the preset time period after being reconnected, the third charging current is provided to the charging circuit.

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