A method for automatically charging an NFC of a smartphone case

Abstract

This invention relates to near-field communication (NFC) technology and proposes a method for automatic NFC charging of a smartphone case. The method includes: acquiring the phone's status broadcast information via a Bluetooth communication module corresponding to the phone case to determine the phone's screen-on state; detecting the radio frequency magnetic field signal emitted by the phone in the screen-on state via an NFC coil corresponding to the phone case to establish electromagnetic induction coupling between the phone's NFC coil and the phone case's wireless charging coil, and determining the coupling state of the electromagnetic induction coupling; sensing the magnetic field emitted by the phone via the wireless charging coil to generate induced alternating current in the phone case, and converting the induced alternating current into a charging voltage for the phone case; establishing data interaction communication between the phone case and the phone via the Bluetooth communication module to obtain the phone's battery status information and control command information, and constructing a hierarchical management mode for the phone case's built-in battery; and executing automatic NFC charging of the phone case. This invention can improve the continuity and stability of automatic NFC charging of the phone case.

Description

Technical Field

[0001] This invention relates to a method for automatic NFC charging of a smartphone case, which belongs to the field of near-field communication technology. Background Technology

[0002] Automatic NFC charging for smartphone cases refers to a technology that utilizes the radio frequency electromagnetic field emitted by the near-field communication coil on the back of the smartphone as a wireless energy source. The phone case, worn over the phone, automatically captures this energy and converts it into direct current, thereby replenishing the rechargeable battery integrated inside the case. Unlike smartwatches, which require periodic removal of the case for charging, automatic NFC charging for smartphone cases effectively utilizes fragmented time during daily phone use to automatically replenish power, achieving "seamless battery life."

[0003] Traditional NFC charging for phone cases uses an instantaneous power extraction mode, primarily based on passive NFC energy harvesting technology. It only triggers a one-time NFC communication when the phone screen is on and the phone is close to an NFC reader. The NFC coil extracts energy from the phone's radio frequency field during the initial interaction to provide a weak, one-time power supply. This method only extracts energy during the NFC interaction and cannot continuously power the built-in device. Furthermore, it lacks a rechargeable battery and cannot accumulate and store energy, thus failing to support continuous functionality. Summary of the Invention

[0004] This invention provides a method for automatic NFC charging of a smartphone case, the main purpose of which is to improve the continuity and stability of automatic NFC charging of the phone case.

[0005] To achieve the above objectives, the present invention provides a method for automatic NFC charging of a smartphone case, comprising: The status broadcast information of the phone is collected by the Bluetooth communication module corresponding to the phone case to determine the screen-on status of the phone. The NFC coil corresponding to the phone case detects the radio frequency magnetic field signal emitted by the phone in the screen-on state, so as to establish electromagnetic induction coupling between the phone's NFC coil and the phone case's wireless charging coil, and determine the coupling state of the electromagnetic induction coupling. Based on the coupling state, the magnetic field emitted by the mobile phone is sensed by the wireless charging coil to generate induced alternating current in the phone case, and the induced alternating current is converted into the charging voltage of the phone case. The Bluetooth communication module establishes data interaction communication between the phone case and the phone to obtain the phone's battery status information and control command information. Based on the battery status information, the control command information and the charging voltage, a hierarchical management mode for the built-in battery of the phone case is constructed. According to the hierarchical management mode, the automatic NFC charging of the phone case is performed.

[0006] Optionally, establishing electromagnetic induction coupling between the NFC coil of the mobile phone and the wireless charging coil of the phone case includes: Based on the radio frequency magnetic field signal and screen-on state of the mobile phone, the coupling conditions between the mobile phone's NFC coil and wireless charging coil are defined; Based on the coupling conditions, determine the transmission resonant frequency of the mobile phone's NFC coil; Based on the transmitting resonant frequency, the receiving resonant frequency of the wireless charging coil is determined; Electromagnetic induction coupling between the mobile phone NFC coil and the wireless charging coil is established based on the transmission resonant frequency and the reception resonant frequency.

[0007] Optionally, determining the transmission resonant frequency of the mobile phone's NFC coil based on the coupling condition includes: Based on the coupling conditions, determine the inductance value of the mobile phone's NFC coil; Based on the inductance value, the matching capacitance value of the mobile phone NFC coil is calculated to determine the transmission resonant frequency of the mobile phone NFC coil.

[0008] Optionally, determining the coupling state of the electromagnetic induction coupling includes: Determine the coupling strength of the electromagnetic induction coupling to determine the coupling level of the electromagnetic induction coupling; The coupling stability of the electromagnetic induction coupling is detected, and the coupling state of the electromagnetic induction coupling is output based on the coupling level and the coupling stability.

[0009] Optionally, determining the coupling strength of the electromagnetic induction coupling includes: Detect the DC voltage generated by the wireless charging coil corresponding to the electromagnetic induction coupling; Calculate the average voltage and voltage fluctuation range of the DC voltage to calculate the coupling coefficient of the electromagnetic induction coupling; The coupling strength of the electromagnetic induction coupling is determined based on the coupling coefficient.

[0010] Optionally, the step of converting the induced alternating current into the charging voltage of the phone case includes: The induced alternating current is rectified by the rectifier circuit in the phone case to obtain unidirectional pulsating direct current. The unidirectional pulsating DC current is filtered by the filtering circuit in the phone case to obtain a smooth DC voltage. The smooth DC voltage is regulated to obtain the charging voltage.

[0011] Optionally, establishing data interaction communication between the phone case and the phone via the Bluetooth communication module includes: Establish a BLE connection and GATT service between the phone case and the phone; Define the data frame format for interaction between the phone case and the phone; Based on the BLE connection, the GATT service, and the interactive data frame format, a data interaction communication is established between the phone case and the phone.

[0012] Optionally, the step of collecting the phone's status broadcast information through the Bluetooth communication module corresponding to the phone case includes: Construct the broadcast data packet of the mobile phone, configure the broadcast parameters of the mobile phone, and determine the scanning parameters of the Bluetooth communication module; Calculate the matching coefficient between the scanning parameters and the broadcast parameters to parse the monitored broadcast data packets into status broadcast information.

[0013] Optionally, the step of constructing a hierarchical management mode for the built-in battery of the phone case based on the battery status information, the control command information, and the charging voltage includes: Based on the battery status information and charging voltage, the capacity level and charging power level of the built-in battery are defined respectively; Based on the control command information, a command intent recognition layer for the phone case is constructed to parse the command intent of the control command information; Based on the battery level, the charging power level, and the command intent, a hierarchical management matrix for the built-in battery is constructed to determine the hierarchical management mode of the built-in battery.

[0014] Optionally, the phone case includes a display module and an access card module, wherein the display module includes an e-ink screen and an RGB display screen; and the access card module includes an NFC front-end module and a Flash storage unit.

[0015] Compared to the problems described in the background technology, this invention collects mobile phone status broadcast information through a Bluetooth module, achieving accurate judgment of the mobile phone's screen-on status and providing a basis for subsequent charging control. Secondly, this invention utilizes an NFC coil to detect radio frequency magnetic field signals, establishing electromagnetic induction coupling between the mobile phone and the phone case and determining the coupling state, ensuring the reliability and stability of the charging process. Based on the coupling state, this invention generates induced alternating current through the induced magnetic field of the wireless charging coil and converts it into charging voltage, achieving efficient energy transfer. This invention obtains the mobile phone's battery status information and control command information through a Bluetooth communication module, and constructs a hierarchical management mode in conjunction with the charging voltage, making the charging process more intelligent and personalized. Finally, this invention executes automatic NFC charging according to the hierarchical management mode, dynamically adjusting the charging strategy based on different battery states and coupling conditions, thereby improving charging efficiency, extending battery life, and ensuring the safety of the charging process. Therefore, this invention can improve the continuity and stability of automatic NFC charging for mobile phone cases. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a method for automatic NFC charging of a smartphone case according to an embodiment of the present invention. Figure 2 IIC timing diagram of an automatic NFC charging method for a smartphone case according to an embodiment of the present invention; Figure 3 This is a structural diagram of a method for automatic NFC charging of a smartphone case according to an embodiment of the present invention; Figure 4 A schematic diagram of a computer device for an embodiment of the present invention, which provides a method for automatic NFC charging of a smartphone case; The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0018] This application provides a method for automatic NFC charging of a smartphone case. The execution subject of this method includes, but is not limited to, at least one electronic device configured to execute the method provided in this application, such as a server or a terminal. In other words, the method for automatic NFC charging of a smartphone case can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster.

[0019] Reference Figure 1The diagram shown is a flowchart illustrating a method for automatic NFC charging of a smartphone case according to an embodiment of the present invention. In this embodiment, the method for automatic NFC charging of a smartphone case includes: S1. Collect the status broadcast information of the mobile phone through the Bluetooth communication module corresponding to the mobile phone case to determine the screen-on status of the mobile phone.

[0020] This invention utilizes the Bluetooth communication module corresponding to the phone case to collect the phone's status broadcast information to determine whether the phone screen is on, serving as a trigger condition for subsequent NFC detection and charging operations. The status broadcast information refers to the status data broadcast by the phone through the Bluetooth communication module.

[0021] As an embodiment of the present invention, the step of collecting the status broadcast information of the mobile phone through the Bluetooth communication module corresponding to the mobile phone case includes: Construct the broadcast data packet of the mobile phone, configure the broadcast parameters of the mobile phone, and determine the scanning parameters of the Bluetooth communication module; Calculate the matching coefficient between the scanning parameters and the broadcast parameters to parse the monitored broadcast data packets into status broadcast information.

[0022] The broadcast data packet refers to a sequence of binary data packaged and sent by the mobile phone in Bluetooth broadcast mode according to the Bluetooth core specification, including a preamble and access address, protocol data unit, and checksum. The broadcast parameters refer to a series of configuration variables on the mobile phone side that control Bluetooth broadcast behavior, such as broadcast interval, broadcast type, and transmission frequency. The scanning parameters refer to a series of configuration variables on the phone case side's Bluetooth module that control listening behavior, such as scanning window, scanning interval, and scanning type. The matching coefficient is a numerical indicator used to quantitatively evaluate the probability of overlap between the phone case's scanning window and the mobile phone's broadcast timing.

[0023] Alternatively, the broadcast data packet can be constructed using the operating system's Bluetooth API, such as AndroidAdvertiseData or iOS CBMutableAdvertisingData.

[0024] In another implementation, the matching coefficient is calculated using the following formula: ; in, Represents the matching coefficient. The broadcast interval represents the broadcast parameters. This indicates the scan interval for the scan parameters.

[0025] It should be explained that, in this invention, the formula... This represents the matching coefficient, with a value range of [0,2]. This indicates that the scanning window duration covers more than one broadcast cycle, and the phone case can capture the screen-on state 100% of the time, but the power consumption is relatively high. This indicates a possibility of missing packets when the scanning window opens just as the broadcast ends.

[0026] This invention, by determining the screen-on state of the mobile phone, can prevent frequent NFC magnetic field detection when the phone screen is off, thus reducing unnecessary electromagnetic radiation to the phone and other near-field devices. The screen-on state refers to the phone screen being lit and interactive.

[0027] Optionally, the screen-on state can be determined by an enumeration value definition method, such as directly using the value of the entire byte to represent the state, where 0x01 represents screen-on and 0x02 represents screen-off.

[0028] S2. The radio frequency magnetic field signal emitted by the mobile phone in the screen-on state is detected by the NFC coil corresponding to the mobile phone case, so as to establish electromagnetic induction coupling between the mobile phone's NFC coil and the wireless charging coil of the mobile phone case, and determine the coupling state of the electromagnetic induction coupling.

[0029] This invention verifies that the phone's NFC module is activated and capable of transmitting radio frequency magnetic field signals normally by detecting the radio frequency magnetic field signal emitted by the phone in the screen-on state through the NFC coil corresponding to the phone case, thus providing a prerequisite for subsequent electromagnetic induction coupling. The radio frequency magnetic field signal refers to an alternating electromagnetic field carrying specific frequency and modulation information radiated outward through the phone's NFC antenna.

[0030] This invention establishes an electromagnetic induction coupling between the NFC coil of the mobile phone and the wireless charging coil of the phone case, creating a physical energy transfer path between the two devices and enabling the phone case to draw power from the phone. Specifically, the electromagnetic induction coupling refers to the energy transfer connection formed between the NFC coil of the mobile phone and the wireless charging coil of the phone case through the interaction of an alternating magnetic field.

[0031] As an embodiment of the present invention, establishing electromagnetic induction coupling between the NFC coil of the mobile phone and the wireless charging coil of the mobile phone case includes: Based on the radio frequency magnetic field signal and screen-on state of the mobile phone, the coupling conditions between the mobile phone's NFC coil and wireless charging coil are defined; Based on the coupling conditions, determine the transmission resonant frequency of the mobile phone's NFC coil; Based on the transmitting resonant frequency, the receiving resonant frequency of the wireless charging coil is determined; Electromagnetic induction coupling between the mobile phone NFC coil and the wireless charging coil is established based on the transmission resonant frequency and the reception resonant frequency.

[0032] The coupling condition refers to the set of physical state thresholds and logical triggering criteria required to establish a stable energy transmission channel between the phone's NFC coil and the phone case's wireless charging coil. The transmit resonant frequency refers to the alternating magnetic field oscillation frequency used by the phone's NFC coil for energy transmission under the control of a specific driving circuit; in this application, the transmit resonant frequency is defined as 13.56 MHz. The receive resonant frequency refers to the inherent frequency of the circuit composed of the phone case's wireless charging coil and its matching capacitor network, which is capable of maximally sensing external magnetic field energy.

[0033] Optionally, determining the transmission resonant frequency of the mobile phone's NFC coil based on the coupling condition includes: Based on the coupling conditions, determine the inductance value of the mobile phone's NFC coil; Based on the inductance value, the matching capacitance value of the mobile phone NFC coil is calculated to determine the transmission resonant frequency of the mobile phone NFC coil.

[0034] The inductance value refers to the ability of the mobile phone's NFC coil to generate an induced electromotive force to resist changes in current when an alternating current passes through it. The matching capacitance value refers to the capacitance value required to achieve the target resonant frequency of the LC resonant circuit when connected in parallel or series with the mobile phone's NFC coil.

[0035] In another implementation, the matching capacitance value is calculated using the following formula: ; in, Indicates the matching capacitor value. Represents pi (π). Indicates the target's resonant transmission frequency. This indicates the inductance value.

[0036] Optionally, the coupling condition can be defined by multi-dimensional logical decision and threshold calibration methods, such as Boolean logic operations, experimental calibration methods, etc.

[0037] Optionally, the transmission resonant frequency can be determined by protocol standard mapping, such as by protocol mapping according to the NFC Forum standard and the NFC wireless charging specification.

[0038] This invention allows for real-time adjustment of circuit parameters by determining the coupling state of the electromagnetic induction coupling, ensuring a favorable coupling condition. The coupling state refers to a comprehensive characterization of the energy transfer capability and physical connection quality between the phone's NFC coil and the phone case's wireless charging coil.

[0039] As an embodiment of the present invention, determining the coupling state of the electromagnetic induction coupling includes: Determine the coupling strength of the electromagnetic induction coupling to determine the coupling level of the electromagnetic induction coupling; The coupling stability of the electromagnetic induction coupling is detected, and the coupling state of the electromagnetic induction coupling is output based on the coupling level and the coupling stability.

[0040] The coupling strength refers to the tightness of the electromagnetic inductive coupling between the NFC coil of the mobile phone and the wireless charging coil of the phone case. The coupling level refers to the discrete levels divided according to the coupling strength value, including strong coupling, medium coupling, weak coupling, and micro coupling. The coupling stability refers to the continuity and consistency of the electromagnetic inductive coupling remaining stable without drastic fluctuations.

[0041] Optionally, the coupling stability can be determined using a sliding window variance analysis method.

[0042] Optionally, the coupling state can be determined by a weighted scoring method.

[0043] Optionally, determining the coupling strength of the electromagnetic induction coupling includes: Detect the DC voltage generated by the wireless charging coil corresponding to the electromagnetic induction coupling; Calculate the average voltage and voltage fluctuation range of the DC voltage to calculate the coupling coefficient of the electromagnetic induction coupling; The coupling strength of the electromagnetic induction coupling is determined based on the coupling coefficient.

[0044] The DC voltage refers to the voltage value of the unidirectional pulsating DC power output by the rectifier and filter circuit. The average voltage refers to the voltage value obtained by arithmetically averaging multiple DC voltage sample values ​​collected within a set sampling time window. The voltage fluctuation range refers to the difference between the maximum and minimum DC voltage values ​​collected within the set sampling time window. The coupling coefficient is a dimensionless parameter that measures the degree of magnetic flux linkage between the NFC coil of the mobile phone and the wireless charging coil of the mobile phone case.

[0045] Optionally, the DC voltage can be obtained using ADC sampling technology, such as fixed-point sampling or high-frequency scanning.

[0046] Optionally, the voltage fluctuation range can be calculated using the range method or the standard deviation method.

[0047] S3. Based on the coupling state, the magnetic field emitted by the mobile phone is sensed by the wireless charging coil to generate induced alternating current in the mobile phone case, and the induced alternating current is converted into the charging voltage of the mobile phone case.

[0048] This invention, based on the coupling state, utilizes the magnetic field emitted by the mobile phone through the wireless charging coil to convert the radio frequency magnetic field energy emitted by the phone's NFC coil into AC power usable by the phone case via electromagnetic induction. The magnetic field refers to the radio frequency electromagnetic field generated by the alternating current excitation when the phone's NFC coil is operating in the screen-on state.

[0049] In this embodiment of the invention, the induced alternating current generated by the phone case can produce an alternating current as the input to the subsequent rectifier circuit, providing the prerequisite for conversion to direct current. Specifically, the induced alternating current refers to the alternating current generated by the wireless charging coil of the phone case through electromagnetic induction under the influence of the radio frequency magnetic field emitted by the phone's NFC coil.

[0050] Optionally, the induced alternating current can be generated using Faraday's law of electromagnetic induction.

[0051] This invention converts the induced AC power into a charging voltage for the phone case. Through rectification and voltage regulation, the fluctuations and ripples of the induced AC power are eliminated, resulting in a stable DC voltage that meets battery charging requirements. Specifically, the charging voltage refers to the stable DC voltage output to the built-in battery charging circuit after the phone case has rectified, filtered, and regulated the induced AC power.

[0052] As an embodiment of the present invention, the step of converting the induced alternating current into the charging voltage of the mobile phone case includes: The induced alternating current is rectified by the rectifier circuit in the phone case to obtain unidirectional pulsating direct current. The unidirectional pulsating DC current is filtered by the filtering circuit in the phone case to obtain a smooth DC voltage. The smooth DC voltage is regulated to obtain the charging voltage.

[0053] The unidirectional pulsating DC power refers to DC power obtained after induced AC power is rectified by a rectifier circuit, resulting in a DC current with a single direction but whose amplitude changes periodically with time. The smooth DC voltage refers to DC voltage with a basically constant amplitude and small fluctuations obtained after unidirectional pulsating DC power is processed by a filter circuit.

[0054] Optionally, the charging voltage can be obtained by regulating the smooth DC voltage using a voltage regulator circuit.

[0055] S4. Establish data interaction communication between the phone case and the phone through the Bluetooth communication module to obtain the battery status information and control command information of the phone. Based on the battery status information, the control command information and the charging voltage, construct a hierarchical management mode for the built-in battery of the phone case.

[0056] In this embodiment of the invention, the data interaction communication established between the phone case and the phone via the Bluetooth communication module allows for the acquisition of user-issued commands such as charging start, stop, and mode switching, achieving bidirectional collaborative control. Specifically, the data interaction communication refers to the bidirectional data transmission channel established between the phone case and the phone via the Bluetooth communication module, used for exchanging status information and control commands.

[0057] As an embodiment of the present invention, the step of establishing data interaction communication between the phone case and the phone through the Bluetooth communication module includes: Establish a BLE connection and GATT service between the phone case and the phone; Define the data frame format for interaction between the phone case and the phone; Based on the BLE connection, the GATT service, and the interactive data frame format, a data interaction communication is established between the phone case and the phone.

[0058] The BLE connection refers to a point-to-point wireless communication link established between the phone case and the phone based on Bluetooth Low Energy technology. The GATT service refers to the data organization structure defined in the attribute protocol, used to standardize the data interaction method after the BLE connection is established. The interaction data frame format refers to the data encapsulation structure agreed upon by both the phone case and the phone when exchanging data.

[0059] Optionally, the BLE connection can be established using a BLE protocol stack, such as NimBLE or SoftDevice.

[0060] Optionally, the interactive data frame format can be defined using a binary frame structure.

[0061] Furthermore, in this invention, the Bluetooth communication between the phone case and the corresponding APP of the phone adopts a two-way command and state synchronization mechanism, wherein the two-way commands include: The user operation data of the corresponding user on the APP is obtained, and the user operation data is converted into control command frames. The control command frame is transmitted to the phone case via the Bluetooth communication module so that the control command frame can be parsed to obtain the command parsing result; Based on the instruction parsing result, the action control of the phone case is executed.

[0062] The user operation data refers to the operations performed by the user on the APP interface, such as switch control, RGB color adjustment, mode switching, and charging parameter adjustment. The control command frame is a set of structured binary data sent by the mobile APP to the phone case's microcontroller unit via Bluetooth, including command code, control parameters, and checksum. The command parsing result refers to the internal control parameters obtained by the microcontroller unit inside the phone case after disassembling, verifying, and recognizing the received control command frame, which can be directly executed by the program. The action control refers to the specific physical operations performed by the phone case's microcontroller unit on the hardware modules inside the phone case based on the parsed command results, such as controlling RGB lighting effects, breathing lights, and music rhythm lighting effects; controlling screen refresh and content switching; and controlling the NFC charging module and sensor switches.

[0063] The state synchronization mechanism includes: The system collects the operating status of the phone case, transmits the operating status to the APP via the Bluetooth communication module, refreshes the APP's interface display based on the operating status, and generates phone case control commands for the APP based on the interface display.

[0064] The "operating status" refers to the collection of real-time operating parameters, health status, and environmental data of each hardware module within the phone case during operation, such as battery level, Bluetooth connection status, current lighting mode, on / off status, and error information. The "interface display" refers to the process by which the mobile app, based on the received phone case operating status data, presents the phone case's current operating status, parameter information, and interactive controls to the user in real time through a graphical user interface. The "phone case control command" refers to standardized data frames generated by the mobile app, sent to the phone case via Bluetooth, and used to command the phone case to perform specific operations.

[0065] This invention enables dynamic adjustment of the phone case's charging strategy by acquiring the phone's battery status information and control command information. The battery status information refers to various parameter data reflecting the phone case's current battery charging status, sent to the phone via the Bluetooth communication module. The control command information refers to instruction data sent from the phone to the phone case via the Bluetooth communication module, used to control the phone case to perform specific operations.

[0066] This invention, through its embodiments, constructs a hierarchical management mode for the built-in battery of the phone case based on the battery status information, control command information, and charging voltage. This enables multi-factor comprehensive judgment of charging decisions, thereby responding to charging needs in different scenarios. Specifically, the hierarchical management mode refers to a management mechanism where the phone case divides charging decisions into multiple priority levels based on multiple input conditions such as phone battery status information, control command information, and charging voltage, and executes corresponding charging operations according to the current status and the corresponding level.

[0067] As an embodiment of the present invention, the step of constructing a hierarchical management mode for the built-in battery of the mobile phone case based on the battery status information, the control command information, and the charging voltage includes: Based on the battery status information and charging voltage, the capacity level and charging power level of the built-in battery are defined respectively; Based on the control command information, a command intent recognition layer for the phone case is constructed to parse the command intent of the control command information; Based on the battery level, the charging power level, and the command intent, a hierarchical management matrix for the built-in battery is constructed to determine the hierarchical management mode of the built-in battery.

[0068] The battery level refers to the hierarchical state of charge (SBC) of the phone case's built-in battery, such as low battery, normal battery, and high battery. The charging power level refers to the power input capability level based on the coupling state between the phone's NFC coil and the wireless charging coil, and the sensed charging voltage amplitude, such as low power, normal power, and high power. The command intent refers to the control target of the phone case battery as interpreted by the Bluetooth communication module, such as forward charging intent, reverse power supply intent, and sleep / standby intent. The hierarchical management matrix is ​​a multi-dimensional logic matrix that takes the battery level, charging power level, and command intent as input dimensions, and outputs a unique hierarchical management mode through a preset logic rule table.

[0069] Optionally, the energy level can be defined by the open-circuit voltage method or the coulomb calculation method, and the charging power level can be defined by the interval mapping method.

[0070] Optionally, the command intent recognition layer can be constructed using a lookup table method based on hash mapping.

[0071] Optionally, the hierarchical management matrix includes: a security protection level, an energy-saving maintenance level, a standard operating level, and an optimized full-charge level.

[0072] The safety protection level refers to the highest priority protection mode triggered when the phone case detects abnormal operating conditions. This is activated when dangerous situations such as excessively high battery temperature, overvoltage charging, severe short circuits, or forced discharge due to extremely low battery levels occur. In this mode, the phone case's microcontroller unit will forcibly cut off the charging and discharging circuit, stop all energy transmission, and lock the system until the abnormality is resolved, aiming to ensure hardware safety. The energy-saving maintenance level refers to the maintenance mode when the phone case is in a low-energy input or low-battery state. This is activated when the charging power level is low or the battery level is low. In this mode, the phone case will significantly limit the charging current, turn off LED indicators and other unnecessary peripherals, and reduce the operating frequency of the microcontroller unit to maintain basic system operation with minimal energy consumption, preventing battery over-discharge or system crashes due to insufficient input power. The standard operating level refers to the normal charging and discharging mode of the phone case under normal operating conditions. This is activated when the battery level is normal and the charging power level is high, or when executing a regular reverse power supply command. In this mode, the charging circuit runs at full speed, voltage conversion efficiency is optimized, data interaction remains active, and the phone case performs charging or discharging tasks with maximum efficiency. The optimized full charge level refers to a refined maintenance mode when the built-in battery is close to full charge. For example, when the battery level is high and the command intention is to charge, the phone case automatically reduces the charging cutoff voltage accuracy and switches to trickle charging or intermittent pulse charging with a very small current to prevent the battery from being overcharged, suppress the battery polarization effect, and thus extend the cycle life of the built-in battery.

[0073] See Figure 2 This invention provides an IIC timing diagram for an automatic NFC charging method for a smartphone case, according to an embodiment of the present invention. The diagram illustrates the voltage waveform changes of SCL (clock line) and SDA (data line) and their timing parameter requirements when the Bluetooth communication module communicates with the NFC chip and the microcontroller unit (MCU) via the IIC protocol. The diagram is divided into three parts, showing the complete data transmission process, the write cycle, and the data output stage. In the complete data transmission process, the timing diagram clearly marks the start condition, stop condition, SDA input change, data validity time, and related timing parameters such as tCHCL, tCLCH, and tHDX. These parameters define the hold time and setup time of the SCL and SDA signals at high and low levels. The write cycle section shows the transition process from the stop condition to the start condition and marks the tw time. The data output stage illustrates the data validity time of the SDA output signal under the action of the SCL signal, including key timing parameters such as tCLDV, tCLDX, and tDL1DL2. These timing diagrams are crucial for understanding and implementing IIC communication between the NFC chip and the microcontroller unit, ensuring accurate and reliable data transmission.

[0074] S5. According to the hierarchical management mode, perform automatic NFC charging of the phone case.

[0075] This invention, through the hierarchical management mode, enables fully automated management of the entire process from detection and charging to stopping charging by performing automatic NFC charging of the phone case, thereby improving charging safety and efficiency.

[0076] Furthermore, the phone case includes a display module and an access card module, wherein the display module includes an e-ink screen and an RGB display screen; and the access card module includes an NFC front-end module and a Flash storage unit.

[0077] The display module refers to a display unit integrated inside the phone case for presenting visual information. The access card module refers to a functional unit integrated inside the phone case for independently simulating access cards offline without relying on the phone's NFC function. The Flash storage unit refers to a storage unit integrated inside the Bluetooth master control microcontroller unit for storing multiple sets of card communication parameters.

[0078] Optionally, the e-ink screen supports Bluetooth master control for content display, including static images such as clock faces and e-books, and supports a timed push mechanism: for example, automatically refreshing and pushing solar term-themed content in the early morning of the day of the 24 solar terms, enhancing the user's cultural experience and the device's intelligent awareness. The RGB display screen supports custom RGB pattern display and custom color configuration, allowing users to dynamically adjust the lighting effects and color combinations according to personal preferences or application scenarios, enhancing the personalized expression and visual interaction capabilities of the phone case.

[0079] See Figure 3 This diagram illustrates the structure of a method for automatic NFC charging of a smartphone case according to an embodiment of the present invention. The diagram shows the hierarchical architecture of the system. At the top is the smartphone, internally labeled with NFC and Bluetooth modules, demonstrating its interaction with external devices via NFC radio frequency signals and Bluetooth communication. The middle section is the phone case, containing core components such as a Bluetooth communication module, NFC / wireless charging coil, rectifier and filter circuit, built-in battery, and microcontroller unit. These modules are connected by arrows, indicating the flow of energy transfer and control signals. At the bottom is a hierarchical management system, comprising four functional modules: safety protection level, energy-saving maintenance level, standard operating level, and optimized full charge level, reflecting the system's intelligent management strategy. The entire diagram visually demonstrates the energy transfer path and intelligent control logic from the smartphone to the phone case.

[0080] In one embodiment, a computer device is provided, which may be a server or a client, and its internal structure diagram may be as follows: Figure 4As shown. The computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used to communicate with external clients via a network connection. When the computer program is executed by the processor, it implements the functions or steps of a method for automatic NFC charging of a smartphone case on the server or client side.

[0081] In one embodiment, a computer device is provided, which may be a server or a client, and its internal structure diagram may be as follows: Figure 4 As shown, the computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used for communication with external clients via a network connection. When executed by the processor, the computer program implements the functions or steps of the server or client side of the statistical characteristic infrared image vertical stripe dynamic suppression method.

[0082] It should be noted that the functions or steps that can be implemented by the computer-readable storage medium or computer device described above can be referred to the relevant descriptions on the server side and client side in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0083] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0084] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0086] Finally, it should be noted that in the above embodiments, each embodiment can be combined with each other or independent. Deleting any one of them will not affect the technical implementation of other embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for automatic NFC charging of a smartphone case, characterized in that, The method includes: The status broadcast information of the phone is collected by the Bluetooth communication module corresponding to the phone case to determine the screen-on status of the phone. The NFC coil corresponding to the phone case detects the radio frequency magnetic field signal emitted by the phone in the screen-on state, so as to establish electromagnetic induction coupling between the phone's NFC coil and the phone case's wireless charging coil, and determine the coupling state of the electromagnetic induction coupling. Based on the coupling state, the magnetic field emitted by the mobile phone is sensed by the wireless charging coil to generate induced alternating current in the phone case, and the induced alternating current is converted into the charging voltage of the phone case. The Bluetooth communication module establishes data interaction communication between the phone case and the phone to obtain the phone's battery status information and control command information. Based on the battery status information, the control command information and the charging voltage, a hierarchical management mode for the built-in battery of the phone case is constructed. According to the hierarchical management mode, the automatic NFC charging of the phone case is performed.

2. The method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, The establishment of electromagnetic induction coupling between the NFC coil of the mobile phone and the wireless charging coil of the phone case includes: Based on the radio frequency magnetic field signal and screen-on state of the mobile phone, the coupling conditions between the mobile phone's NFC coil and wireless charging coil are defined; Based on the coupling conditions, determine the transmission resonant frequency of the mobile phone's NFC coil; Based on the transmitting resonant frequency, the receiving resonant frequency of the wireless charging coil is determined; Electromagnetic induction coupling between the mobile phone NFC coil and the wireless charging coil is established based on the transmission resonant frequency and the reception resonant frequency.

3. The method for automatic NFC charging of a smartphone case as described in claim 2, characterized in that, Determining the transmission resonant frequency of the mobile phone's NFC coil based on the coupling condition includes: Based on the coupling conditions, determine the inductance value of the mobile phone's NFC coil; Based on the inductance value, the matching capacitance value of the mobile phone NFC coil is calculated to determine the transmission resonant frequency of the mobile phone NFC coil.

4. The method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, Determining the coupling state of the electromagnetic induction coupling includes: Determine the coupling strength of the electromagnetic induction coupling to determine the coupling level of the electromagnetic induction coupling; The coupling stability of the electromagnetic induction coupling is detected, and the coupling state of the electromagnetic induction coupling is output based on the coupling level and the coupling stability.

5. The method for automatic NFC charging of a smartphone case as described in claim 4, characterized in that, Determining the coupling strength of the electromagnetic induction coupling includes: Detect the DC voltage generated by the wireless charging coil corresponding to the electromagnetic induction coupling; Calculate the average voltage and voltage fluctuation range of the DC voltage to calculate the coupling coefficient of the electromagnetic induction coupling; The coupling strength of the electromagnetic induction coupling is determined based on the coupling coefficient.

6. The method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, The process of converting the induced alternating current into the charging voltage of the phone case includes: The induced alternating current is rectified by the rectifier circuit in the phone case to obtain unidirectional pulsating direct current. The unidirectional pulsating DC current is filtered by the filtering circuit in the phone case to obtain a smooth DC voltage. The smooth DC voltage is regulated to obtain the charging voltage.

7. The method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, The step of establishing data interaction communication between the phone case and the phone via the Bluetooth communication module includes: Establish a BLE connection and GATT service between the phone case and the phone; Define the data frame format for interaction between the phone case and the phone; Based on the BLE connection, the GATT service, and the interactive data frame format, a data interaction communication is established between the phone case and the phone.

8. The method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, The step of collecting the phone's status broadcast information through the Bluetooth communication module corresponding to the phone case includes: Construct the broadcast data packet of the mobile phone, configure the broadcast parameters of the mobile phone, and determine the scanning parameters of the Bluetooth communication module; Calculate the matching coefficient between the scanning parameters and the broadcast parameters to parse the monitored broadcast data packets into status broadcast information.

9. A method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, The step of constructing a hierarchical management mode for the built-in battery of the phone case based on the battery status information, the control command information, and the charging voltage includes: Based on the battery status information and charging voltage, the capacity level and charging power level of the built-in battery are defined respectively; Based on the control command information, a command intent recognition layer for the phone case is constructed to parse the command intent of the control command information; Based on the battery level, the charging power level, and the command intent, a hierarchical management matrix for the built-in battery is constructed to determine the hierarchical management mode of the built-in battery.

10. A method for automatic NFC charging of a smartphone case as described in claim 1, characterized in that, The phone case includes a display module and an access card module. The display module includes an e-ink screen and an RGB display screen. The access card module includes an NFC front-end module and a Flash storage unit.

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