A charging control circuit and control method, and a charging device

Abstract

The application relates to the technical field of charging equipment, and discloses a charging control circuit and a control method, and charging equipment, the charging control circuit comprising an NFC communication module, a ground control module and an MCU control module, wherein the ground control module is used for adjusting the connection / disconnection state of an NFC coil in the NFC communication module and a ground terminal; the MCU control module is used for monitoring a control signal and controlling the ground control module to adjust the connection / disconnection state of the NFC coil and the ground terminal based on the control signal. The application adjusts the connection / disconnection state of the NFC coil and the ground terminal by integrating the ground control module and using the MCU control module to monitor the control signal in real time. The dynamic ground control scheme according to the monitored control signal enables the NFC coil to start working according to the control signal when the charging equipment charges the to-be-charged equipment, avoids continuous working of the NFC coil of the charging equipment, and thus avoids the screen of the to-be-charged equipment from frequently popping up irrelevant application interfaces or NFC sensing prompts.

Description

Technical Field

[0001] This application relates to the field of charging equipment technology, and in particular to a charging control circuit and control method, and a charging device. Background Technology

[0002] In the field of charging equipment, near field communication (NFC) technology is being integrated into charging devices (such as power banks) to enhance user experience and product differentiation. For example, by utilizing the contactless and low-power characteristics of NFC, users can easily launch pre-set applications simply by bringing an NFC-enabled device (such as a smartphone) close to a specific area of ​​the power bank. This allows them to read manufacturer information stored within the power bank, thereby achieving intelligent management.

[0003] However, when a smartphone is in close physical proximity to a power bank while charging, the NFC coil inside the power bank continuously operates. The alternating magnetic field it generates repeatedly triggers the NFC function of the smartphone within its sensing range, causing the smartphone screen to frequently display irrelevant application interfaces or NFC sensing prompts, severely interfering with normal user operation. This not only significantly degrades the user experience, but the continuous operation of the NFC coil may also increase unnecessary power consumption and, in extreme cases, potentially interfere with the stability of the charging circuit, posing a safety hazard. Summary of the Invention

[0004] This application provides a wireless charging device to solve the problem that the NFC coil of the charging control circuit in existing charging devices is constantly working, causing the screen of the device to be charged to frequently pop up irrelevant application interfaces or NFC sensing prompts.

[0005] To address the aforementioned problems, the first aspect of this application proposes a charging control circuit. This charging control circuit includes: an NFC communication module for communicating with a device to be charged, comprising: an NFC chip and an NFC coil electrically connected to the NFC chip, wherein the NFC chip stores information to be displayed and transmits it to the NFC coil, and the NFC coil receives the information to be displayed and transmits it to the device to be charged; a grounding control module electrically connected to the NFC coil for adjusting the connection / disconnection state between the NFC coil and the grounding terminal; and an MCU control module electrically connected to both the NFC chip and the grounding control module for monitoring control signals and controlling the grounding control module to adjust the connection / disconnection state between the NFC coil and the grounding terminal based on the control signals.

[0006] In some embodiments of this application, the grounding control module includes a MOSFET switch, which is electrically connected to the MCU control module, the NFC coil, and the grounding terminal, respectively, and is used to adjust the connection and disconnection state between the NFC coil and the grounding terminal.

[0007] In some embodiments of this application, the MOSFET switch has a connected state and a disconnected state, wherein: when the MOSFET switch is in the connected state, the NFC coil is connected to the ground terminal; when the MOSFET switch is in the disconnected state, the NFC coil is disconnected from the ground terminal.

[0008] In some embodiments of this application, the control signal includes a charging signal, and the charging control circuit further includes a charging circuit and a charging status detection module, wherein: the charging circuit is electrically connected to the MCU control module; the charging status detection module is electrically connected to the MCU control module and is used to identify whether the charging circuit has a charging signal; the MCU control module is also used to control the grounding control module to connect the NFC coil to the ground terminal when a charging signal is detected.

[0009] In some embodiments of this application, the MCU control module is also used to control the ground control module to connect the NFC coil to the ground terminal when no charging signal is detected and no trigger signal is received.

[0010] In some embodiments of this application, the control signal includes a charging completion signal, wherein: the charging status detection module is further configured to identify whether the charging circuit has a charging completion signal; and the MCU control module is further configured to control the grounding control module to disconnect the NFC coil from the ground terminal when the charging completion signal is detected.

[0011] In some embodiments of this application, the charging control circuit further includes a signal processing module, wherein: the signal processing module is electrically connected to the MCU control module and is used to generate a trigger signal and transmit it to the MCU control module; the MCU control module is also used to control the grounding control module to disconnect the NFC coil from the ground terminal when it receives the trigger signal.

[0012] In some embodiments of this application, the charging control circuit further includes: a cell parameter acquisition module and a charging circuit. The cell parameter acquisition module is electrically connected to the charging circuit, the MCU control module and the NFC chip respectively, and is used to acquire the battery status parameters of the charging circuit and transmit them to the NFC chip.

[0013] Based on the same inventive concept, a second aspect of this application proposes a control method for a charging control circuit. The method includes: detecting a control signal; and, in response to the control signal, controlling a grounding control module to adjust the connection / disconnection state between the NFC coil and the grounding terminal.

[0014] In some embodiments of this application, the method includes: detecting a charging signal; and in response to the charging signal, controlling the grounding control module to connect the NFC coil to the ground terminal.

[0015] In some embodiments of this application, the method includes: when no charging signal is detected and no trigger signal is received, the control grounding control module connects the NFC coil to the ground terminal.

[0016] In some embodiments of this application, the method includes: when a trigger signal is received, the control grounding control module disconnects the NFC coil from the ground terminal.

[0017] Based on the same inventive concept, this application proposes a charging device, which includes a battery and a charging control circuit as described in any of the first aspects. The battery is electrically connected to the charging control circuit, and the charging device is configured to execute the charging control circuit control method as described in any of the second aspects.

[0018] The beneficial effects of this application are as follows: This application discloses a charging control circuit, which includes an NFC communication module, a grounding control module, and an MCU control module. The grounding control module is used to adjust the connection / disconnection state between the NFC coil and the ground terminal in the NFC communication module. The MCU control module is used to monitor control signals and, based on the control signals, control the grounding control module to adjust the connection / disconnection state between the NFC coil and the ground terminal. This application integrates a grounding control module and utilizes the MCU control module to monitor control signals in real time to adjust the connection / disconnection state between the NFC coil and the ground terminal. This dynamic grounding control scheme, based on the monitored control signals, ensures that when the charging device charges the device to be charged, the NFC coil starts working according to the control signals, avoiding continuous operation of the charging device's NFC coil and thus preventing the screen of the device to be charged from frequently displaying irrelevant application interfaces or NFC sensing prompts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the circuit composition of an embodiment of the integrated grounding control module in the charging control circuit provided in this application; Figure 2 This is a schematic diagram of the circuit composition of an embodiment of the grounding control module integrating a MOSFET switch provided in this application; Figure 3 This is a schematic diagram of the circuit composition of an embodiment of the charging status detection module integrated in the charging control circuit provided in this application; Figure 4 This is a schematic diagram of the circuit composition of an embodiment of the integrated voltage detection circuit in the charging state detection module provided in this application; Figure 5 This is a schematic diagram of the circuit composition of an embodiment of the integrated signal processing module in the charging control circuit provided in this application; Figure 6 This is a schematic diagram of the circuit composition of an embodiment of the integrated control switch in the signal processing module provided in this application; Figure 7 This is a schematic diagram of the circuit composition of an embodiment of the integrated cell parameter acquisition module in the charging control circuit provided in this application; Figure 8 This is a schematic diagram of the circuit composition principle of an embodiment of the charging control circuit provided in this application; Figure 9 This is a flowchart illustrating an embodiment of the control method for the charging control circuit provided in this application.

[0020] Figure label: 100. Charging control circuit; 10. NFC communication module; 11. NFC chip; 12. NFC coil; 20. Grounding control module; 21. MOSFET switch; 30. MCU control module; 40. Charging circuit; 50. Charging status detection module; 51. Voltage detection circuit; 60. Signal processing module; 61. Control switch; 70. Cell parameter acquisition module. Detailed Implementation

[0021] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0022] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0023] As described in the background section, the continuous operation of the NFC coil in the charging control circuit of existing charging devices causes the screen of the device being charged to frequently pop up irrelevant application interfaces or NFC sensing prompts, severely interfering with normal user operation. This not only significantly degrades the user experience, but the continuous operation of the NFC coil may also increase unnecessary power consumption and, in extreme cases, potentially interfere with the stability of the charging circuit, posing a safety hazard.

[0024] To address the aforementioned issues, this application proposes a novel charging control circuit. By integrating a grounding control module into the charging control circuit, and utilizing an MCU control module to monitor control signals in real time, the connection / disconnection state between the NFC coil and the ground terminal is adjusted. This dynamic grounding control scheme, based on the monitored control signals, ensures that when the charging device charges the device to be charged, the NFC coil activates according to the control signal, preventing the charging device's NFC coil from continuously operating and thus avoiding the frequent pop-ups of irrelevant application interfaces or NFC sensing prompts on the screen of the device to be charged.

[0025] Before introducing specific embodiments of this application, the following related terms involved in this application need to be explained: Ground terminal: This refers to the 0 potential reference point set in the charging control circuit, usually represented by the symbol "⊥" or "GND", which provides a reference for all voltage measurements. For example, the ground terminal can be a wire with a charging control reference potential of 0, or the product casing, etc.

[0026] This application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] I. Charging control circuit 100 According to one embodiment of this application, a charging control circuit 100 is proposed, such as... Figure 1 As shown, the charging control circuit 100 of this application includes: an NFC communication module 10 for communicating with the device to be charged, comprising: an NFC chip 11 and an NFC coil 12 electrically connected to the NFC chip 11, wherein the NFC chip 11 is used to store information to be displayed and transmit it to the NFC coil 12, and the NFC coil 12 is used to receive the information to be displayed and transmit it to the device to be charged; a grounding control module 20 electrically connected to the NFC coil 12 for adjusting the connection state between the NFC coil 12 and the grounding terminal; and an MCU control module 30 electrically connected to the NFC chip 11 and the grounding control module 20 respectively for monitoring control signals and controlling the grounding control module 20 to adjust the connection state between the NFC coil 12 and the grounding terminal based on the control signals.

[0028] Therefore, it can be seen that the NFC coil 12 in the above embodiments of this application starts working according to the control signal, avoiding continuous operation of the NFC coil 12 of the charging device, thereby preventing the screen of the device to be charged from frequently popping up irrelevant application interfaces or NFC sensing prompts. This not only improves the user experience, but also enhances the security of the entire charging control circuit 100.

[0029] The inventors discovered that the grounding control module 20 is designed with ultra-low power components to ensure that the standby current of the power bank is extremely low in the grounded state, without affecting the overall power consumption performance of the power bank. Therefore, in this embodiment, as... Figure 2As shown, the grounding control module 20 includes a MOSFET switch 21 (MOSFET stands for Metal-Oxide-Semiconductor Field-Effect Transistor), which is electrically connected to the MCU control module 30, the NFC coil 12 and the grounding terminal respectively, and is used to adjust the connection and disconnection state between the NFC coil 12 and the grounding terminal.

[0030] In this embodiment, the MOSFET switch 21 has a connected state and a disconnected state, wherein: when the MOSFET switch 21 is in the connected state, the NFC coil 12 is connected to the ground terminal; when the MOSFET switch 21 is in the disconnected state, the NFC coil 12 is disconnected from the ground terminal.

[0031] Therefore, the above embodiments of this application utilize the millisecond-level fast response characteristics of MOSFET switches, enabling the NFC coil 12 to quickly return to normal working state when data transmission is required.

[0032] In this embodiment, the control signal includes a charging signal, and as follows: Figure 3 As shown, the charging control circuit 100 also includes a charging circuit 40 and a charging status detection module 50, wherein: the charging circuit 40 is electrically connected to the MCU control module 30; the charging status detection module 50 is electrically connected to the MCU control module 30 and is used to identify whether the charging circuit 40 has a charging signal; the MCU control module 30 is also used to control the grounding control module 20 to connect the NFC coil 12 to the ground terminal when a charging signal is detected. The charging circuit 40 being in a charging state indicates that a charging signal is present in the charging circuit 40, and the charging circuit 40 being in a non-charging state indicates that no charging signal is present in the charging circuit 40.

[0033] Therefore, the above embodiments of this application introduce a charging status detection module 50 connected to the charging circuit 40. When a charging signal is detected, the MCU control module 30 can automatically control the grounding control module 20 to ground the NFC coil 12, thereby actively shielding the NFC function during charging and completely avoiding interference problems such as screen mis-triggering and frequent application pop-ups that may be caused by the continuous operation of the NFC coil 12. When charging stops, the charging control circuit 100 can automatically restore the normal working state of the NFC coil 12 to ensure that its contactless communication function is available.

[0034] In this embodiment, as Figure 4 As shown, the charging status detection module 50 includes a voltage detection circuit 51, which is electrically connected to the MCU control module 30, for detecting the voltage value of the charging circuit 40, and identifying whether the charging circuit 40 has a charging signal based on the voltage value.

[0035] In this embodiment, the charging circuit 40 includes a battery and a charging interface. The voltage detection circuit 51 is used to detect the voltage value of the charging interface, compare the voltage value of the charging interface with the voltage value of the battery and a preset voltage value respectively, and identify that the charging circuit 40 has a charging signal when the voltage value of the charging interface is greater than or equal to the preset voltage value and greater than the voltage value of the battery.

[0036] Therefore, the embodiments of this application, by integrating a voltage detection circuit 51 into the charging control circuit 100 to directly monitor the charging status, can accurately and reliably automatically identify whether the device is charging, without relying on external signals or manual judgment. This provides a precise basis for realizing the automatic switching of NFC coil 12 grounding and communication mode, ensuring charging safety and the timeliness of communication function switching, and improving the automation and intelligence level of device operation.

[0037] In this embodiment, the MCU control module 30 is also used to control the ground control module 20 to connect the NFC coil 12 to the ground terminal when no charging signal is detected and no trigger signal is received.

[0038] Therefore, the above embodiments of this application, through the MCU control module 30 connecting the NFC coil 12 to the ground terminal when no charging signal is detected and no trigger signal is received, realize intelligent sleep and on-demand wake-up of the NFC function. This design allows the charging control circuit 100 to automatically disable the NFC function in most non-use states (such as standby and idle), effectively preventing problems such as false triggering, misreading of cards, and unexpected application startup caused by environmental electromagnetic fields or unintentional proximity, significantly improving the safety and stability of the charging control circuit 100, and fundamentally reducing the standby power consumption of the NFC coil 12 in unnecessary states, thus extending battery life. At the same time, when the user intends to use the device (such as charging or active triggering), the charging control circuit 100 can quickly restore communication capability with a millisecond-level response.

[0039] In this embodiment, the control signal includes a charging completion signal, wherein: the charging status detection module 50 is also used to identify whether the charging circuit 40 has a charging completion signal; the MCU control module 30 is also used to control the grounding control module 20 to disconnect the NFC coil 12 from the ground terminal when the charging completion signal is detected.

[0040] Therefore, the above embodiments of this application automatically disconnect the grounding connection of the NFC coil 12 after charging is completed, so as to restore its communication function. This ensures that the NFC function of the charging device is ready immediately when it is fully charged and ready for use or has just finished charging. This avoids the NFC communication function being unavailable due to forgetting to manually switch, and improves the user experience and the level of device intelligence.

[0041] In this embodiment, as Figure 5 As shown, the charging control circuit 100 also includes: a signal processing module 60 electrically connected to the MCU control module 30, used to generate a trigger signal and transmit it to the MCU control module 30; the MCU control module 30 is also used to control the grounding control module 20 to disconnect the NFC coil 12 from the grounding terminal when it receives the trigger signal.

[0042] In this embodiment, as Figure 6 As shown, the signal processing module 60 includes a control switch 61, which is electrically connected to the MCU control module 30 and is used to generate a trigger signal and transmit it to the MCU control module 30. In this embodiment, the control switch 61 can be a button, which is pressed by the user to generate a trigger signal and transmit it to the MCU control module 30. It should be noted that the control switch can also be other structural designs that can generate trigger signals, and is not limited to the button form in this embodiment.

[0043] Therefore, the above embodiments of this application integrate a signal processing module 60 into the charging control circuit 100, enabling the charging device to receive and respond to external or user-initiated trigger signals, thereby activating the NFC communication function on demand and instantly. This gives users greater autonomy over when to use NFC, ensuring that the NFC communication function is readily available when card swiping, pairing, or data transmission is required. It also enables flexible switching between energy-saving standby and rapid response, further enhancing the interactive convenience and user experience of the charging device.

[0044] With the development of portable power bank technology, portable power bank products are gradually transforming from "functional products" to "safe and intelligent products." Safe and intelligent products require portable power banks to have capabilities such as battery status monitoring, intelligent management, and information interaction. This means that portable power banks need to collect and transmit key data such as battery voltage, temperature, current, and cycle count in real time.

[0045] Therefore, in this embodiment, as Figure 7 As shown, the charging control circuit 100 also includes a cell parameter acquisition module 70 and a charging circuit 40. The cell parameter acquisition module 70 is electrically connected to the charging circuit 40, the MCU control module 30 and the NFC chip 11, respectively, and is used to acquire the battery status parameters of the charging circuit 40 and transmit them to the NFC chip 11.

[0046] Therefore, the above embodiments of this application integrate a cell parameter acquisition module 70 into the charging control circuit 100, enabling the charging device (e.g., a power bank) to collect and transmit key battery data in real time. This meets the intelligent requirements of the power bank for battery status monitoring and information interaction, and realizes the upgrade of the product from "functional" to "safe and intelligent", thereby improving the product's safety, management intelligence level, and market competitiveness.

[0047] Furthermore, such as Figure 8 As shown, NFC coil 12 (corresponding to Figure 8 The LA and LB pins of H1) correspond to the NFC chip 11 (corresponding to Figure 8 The LA and LB pins of U1 are electrically connected, and the MOSFET switch 21 (corresponding to) Figure 8 Q11 is electrically connected to NFC coil 12, terminal 3 of MOSFET switch 21 is electrically connected to NFC coil 12, terminal 2 of MOSFET switch 21 is electrically connected to ground, and terminal 1 of MOSFET switch 21 is electrically connected to the NFCSW pin, which is electrically connected to the MCU control module.

[0048] II. Control Method of Charging Control Circuit 100 Furthermore, in order to better understand the working process of the charging control circuit 100 proposed in the above embodiments of this application, based on the same inventive concept, this application proposes a control method for the charging control circuit 100. The method of this application includes: monitoring a control signal; and in response to the control signal, controlling the grounding control module 20 to adjust the connection and disconnection state between the NFC coil 12 and the grounding terminal.

[0049] Therefore, the above embodiments of this application realize automatic and reliable switching between charging safety mode and NFC communication mode by dynamically adjusting the grounding state of NFC coil 12 in response to control signals, effectively avoiding signal interference and safety hazards during charging, and improving the intelligence level and overall safety of the power bank.

[0050] In this embodiment, the method of this application includes: detecting a charging signal; and in response to the charging signal, controlling the grounding control module 20 to connect the NFC coil 12 to the grounding terminal.

[0051] Therefore, the above embodiments of this application, by connecting the NFC coil 12 to the ground terminal during charging, transform the coil into an electromagnetic shielding layer, effectively suppressing the impact of high-frequency interference generated by the charging circuit 40 on the NFC communication of external devices, ensuring that charging and communication modes do not interfere with each other, and improving the reliability and safety of the device under complex working conditions.

[0052] In this embodiment, the method of this application includes: when no charging signal is detected and no trigger signal is received, the control grounding control module 20 connects the NFC coil 12 to the grounding terminal.

[0053] Therefore, the above embodiments of this application effectively shield the potential interference of the internal circuit of the device to the NFC antenna by grounding the NFC coil 12 normally, ensuring that the external NFC signal can stably and reliably trigger the device in the standby state when it is not charging or communicating, thereby improving the sensitivity and reliability of the device's NFC response function.

[0054] In this embodiment, the method of this application includes: when a trigger signal is received, the control grounding control module 20 disconnects the NFC coil 12 from the grounding terminal.

[0055] Therefore, it can be seen that after receiving the trigger signal, the above embodiments of this application disconnect the NFC coil 12 from the ground terminal, so that it quickly switches from the shielded state to the high-efficiency antenna mode, thereby maximizing the reception and transmission of NFC signals and ensuring the sensitivity of near-field communication and the reliability of data transmission.

[0056] In this embodiment, the method of this application further includes: when a charging completion signal is detected, the control grounding control module 20 disconnects the NFC coil 12 from the grounding terminal.

[0057] Therefore, the above embodiments of this application automatically disconnect the NFC coil 12 from the ground terminal after charging is completed, restoring it to communication mode. This ensures that the device can immediately respond to the NFC function after charging is completed, avoiding functional interruption caused by human forgetting to operate, and improving user experience and device smart usability.

[0058] In this embodiment, as Figure 9 As shown, the working process of the charging control circuit 100 is as follows: (1) Initialize the charging control circuit 100.

[0059] (2) The charging status detection module 50 detects whether the charging circuit 40 is in a charging state. If it is, the MCU control module 30 controls the ground control module 20 to connect the NFC coil 12 to the ground terminal; otherwise, it determines whether the trigger signal sent by the signal processing module 60 has been received.

[0060] (3) The MCU control module 30 controls the ground control module 20 to connect the NFC coil 12 to the ground terminal.

[0061] (4) After the NFC coil 12 is connected to the ground terminal, the charging control circuit 100 maintains the preset default state. At the same time, the charging status detection module 50 detects whether the charging is complete. If it is, the MCU control module 30 controls the ground control module 20 to disconnect the NFC coil 12 from the ground terminal; otherwise, it determines whether the trigger signal sent by the signal processing module 60 has been received.

[0062] (5) The MCU control module 30 controls the ground control module 20 to disconnect the NFC coil 12 from the ground terminal. The NFC coil 12 works normally. At the same time, it controls the cell parameter acquisition module 70 to acquire battery status parameters (such as voltage, and / or temperature, and / or current, and / or number of charging cycles). The NFC coil 12 interacts with the NFC of the device to be charged to transmit battery status parameters. It determines whether the data transmission is complete. If so, it determines whether to connect the NFC coil 12 to the ground terminal. Otherwise, it controls the cell parameter acquisition module 70 to acquire battery status parameters.

[0063] (6) If the result is that the NFC coil 12 is connected to the ground terminal, the MCU control module 30 controls the ground control module 20 to connect the NFC coil 12 to the ground terminal; otherwise, it is determined whether a trigger signal sent by the signal processing module 60 is received (the trigger signal can be obtained by pressing and holding the power button of the charging device for 5 seconds). If yes, the MCU control module 30 controls the ground control module 20 to disconnect the NFC coil 12 from the ground terminal; otherwise, the MCU control module 30 controls the ground control module 20 to connect the NFC coil 12 to the ground terminal.

[0064] (7) When the MCU control module 30 receives the trigger signal sent by the signal processing module 60, the MCU control module 30 controls the ground control module 20 to disconnect the NFC coil 12 from the ground terminal; when the MCU control module 30 does not receive the trigger signal sent by the signal processing module 60, the MCU control module 30 controls the ground control module 20 to connect the NFC coil 12 to the ground terminal.

[0065] Therefore, the working process of the charging control circuit in this application can be divided into three stages: (1) Default state stage (grounded state): When the power bank is in the charging state, the charging state detection module 50 recognizes the charging signal, and the MCU control module 30 controls the grounding control module 20 to ground one end of the NFC coil 12 to suppress the NFC field strength and avoid triggering the mobile phone pop-up window; when the power bank is not in the charging state and has not received a trigger signal, the NFC coil 12 remains in the grounded state to prevent accidental triggering of the NFC function.

[0066] (2) Triggering state stage (non-grounded state): Manual trigger: The user presses and holds the control switch of the power bank for 6 to 15 seconds. After the signal processing module 60 confirms the trigger signal, the MCU control module 30 controls the grounding control module 20 to disconnect the ground of the NFC coil 12, so that the NFC coil 12 can return to normal working state and transmit data with the mobile phone; Automatic trigger: When the power bank finishes charging, the charging status detection module 50 recognizes the charging completion signal. The MCU can automatically control the grounding control module 20 to disconnect the ground, so that the NFC coil 12 can return to normal working state and make it convenient for the user to view the battery data.

[0067] (3) Data transmission stage: In the non-grounded state, the NFC coil 12 works normally, interacting with the mobile phone through the NFC communication module 10 to transmit key parameters such as battery voltage, temperature, current, and number of charging cycles, meeting the requirements of intelligent management. After the data transmission is completed, the NFC coil 12 can automatically return to the grounded state according to the settings, or wait for the user to trigger it again.

[0068] Therefore, the intelligent charging control process of the above embodiments of this application enables the NFC coil 12 to be activated only when communication is required, effectively avoiding accidental screen touches and frequent pop-ups of irrelevant prompts caused by continuous NFC sensing during the charging process, thereby significantly improving the user experience and reducing the energy consumption and potential risks caused by unnecessary circuit operation.

[0069] Based on the above analysis, the core of the above embodiments of this application lies in realizing the intelligent switching of NFC coil 12 through the following dynamic grounding control technology: (1) Active field strength suppression: By controlling the circuit, one end of NFC coil 12 is grounded, destroying its LC resonant circuit, so that NFC coil 12 cannot generate an electromagnetic field that conforms to the ISO standard of 13.56MHz, thereby avoiding triggering the NFC pop-up window on the mobile phone. (2) Dual triggering mechanism: The intelligent switching of grounding control is realized by combining manual triggering (long press the control switch for 6 to 15 seconds) and automatic triggering (charging status detection).

[0070] Similarly, based on the same inventive concept, this application also proposes a charging device. The charging device of this application includes a battery and a charging control circuit 100 of any of the above embodiments. The battery is electrically connected to the charging control circuit 100, and the charging device is configured to execute the control method of the charging control circuit 100 described in any of the above embodiments.

[0071] The inventors verified through experiments that grounding any one end of the NFC coil of the power bank can effectively prevent more than 10 mobile phones from frequently triggering NFC pop-ups.

[0072] In summary, compared to existing charging devices where the NFC coil 12 of the charging control circuit 100 needs to operate continuously, the NFC coil 12 of the above embodiment of this application starts operating based on a control signal, avoiding continuous operation of the NFC coil 12 of the charging device. This prevents the screen of the device to be charged from frequently popping up irrelevant application interfaces or NFC sensing prompts. This not only improves the user experience but also enhances the security of the entire charging control circuit 100.

Claims

1. A charging control circuit, characterized in that, The charging control circuit includes: An NFC communication module for communicating with a device to be charged includes: an NFC chip and an NFC coil electrically connected to the NFC chip, wherein the NFC chip is used to store information to be displayed and transmit it to the NFC coil, and the NFC coil is used to receive the information to be displayed and transmit it to the device to be charged; A grounding control module, electrically connected to the NFC coil, is used to adjust the connection / disconnection status between the NFC coil and the grounding terminal; The MCU control module is electrically connected to the NFC chip and the grounding control module respectively. It is used to monitor control signals and control the grounding control module to adjust the connection and disconnection status between the NFC coil and the grounding terminal based on the control signals.

2. The charging control circuit according to claim 1, characterized in that, The grounding control module includes a MOSFET switch, which is electrically connected to the MCU control module, the NFC coil, and the grounding terminal, respectively, and is used to adjust the connection and disconnection status between the NFC coil and the grounding terminal.

3. The charging control circuit according to claim 2, characterized in that, The MOSFET switch has an on state and an off state, wherein: When the MOSFET switch is in the connected state, the NFC coil is connected to the ground terminal; When the MOSFET switch is in the off state, the NFC coil is disconnected from the ground terminal.

4. The charging control circuit according to claim 1, characterized in that, The control signal includes a charging signal, and the charging control circuit further includes a charging circuit and a charging status detection module, wherein: The charging circuit is electrically connected to the MCU control module; The charging status detection module is electrically connected to the MCU control module and is used to identify whether the charging circuit has a charging signal. The MCU control module is also used to control the grounding control module to connect the NFC coil to the grounding terminal when the charging signal is detected.

5. The charging control circuit according to claim 4, characterized in that, The MCU control module is also used to control the grounding control module to connect the NFC coil to the grounding terminal when no charging signal is detected and no trigger signal is received.

6. The charging control circuit according to claim 4, characterized in that, The control signal includes a charging complete signal, wherein: The charging status detection module is also used to identify whether the charging circuit has a charging completion signal; The MCU control module is also used to control the grounding control module to disconnect the NFC coil from the grounding terminal when the charging completion signal is detected.

7. The charging control circuit according to claim 5, characterized in that, The charging control circuit further includes a signal processing module, wherein: The signal processing module is electrically connected to the MCU control module and is used to generate the trigger signal and transmit it to the MCU control module. The MCU control module is also used to control the grounding control module to disconnect the NFC coil from the grounding terminal when it receives the trigger signal.

8. The charging control circuit according to claim 1, characterized in that, The charging control circuit further includes a cell parameter acquisition module and a charging circuit. The cell parameter acquisition module is electrically connected to the charging circuit, the MCU control module and the NFC chip respectively, and is used to acquire the battery status parameters of the charging circuit and transmit them to the NFC chip.

9. A control method based on the charging control circuit as described in any one of claims 1-8, characterized in that, The method includes: The control signal was detected; In response to the control signal, the grounding control module is controlled to adjust the connection / disconnection state between the NFC coil and the grounding terminal.

10. The control method for the charging control circuit according to claim 9, characterized in that, The method further includes: Charging signal detected; In response to the charging signal, the grounding control module is controlled to connect the NFC coil to the grounding terminal.

11. The control method for the charging control circuit according to claim 9, characterized in that, The method further includes: when no charging signal is detected and no trigger signal is received, controlling the grounding control module to connect the NFC coil to the grounding terminal.

12. The control method for the charging control circuit according to claim 9, characterized in that, The method further includes: upon receiving a trigger signal, controlling the grounding control module to disconnect the NFC coil from the grounding terminal.

13. A charging device, characterized in that, The charging device includes a battery and a charging control circuit as described in any one of claims 1-8, the battery being electrically connected to the charging control circuit, and the charging device being configured to perform a charging control circuit control method as described in any one of claims 9-12.

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