Device charging circuit, chip and wearable device

Abstract

The utility model relates to a kind of equipment charging circuit, chip and wearable device, the equipment charging circuit, comprising: N battery packs, N is the integer greater than or equal to 2;N battery management module, each battery management module connects a battery pack, for monitoring the state data of corresponding battery pack;Control module is connected with each battery management module by communication bus, for receiving the state data reported by each battery management module, and according to state data generation control instruction, issue to corresponding battery management module, to execute corresponding charging control operation by battery management module according to the control instruction received, to realize the independent, accurate charging control of multiple battery packs.

Description

Technical Field

[0001] This utility model relates to the field of power management technology, and in particular to a device charging circuit, chip, and wearable device. Background Technology

[0002] As wearable devices continue to expand their functionality and improve their performance, they place higher demands on battery pack charging management. To meet the charging needs of wearable devices, several device charging circuits have been developed. However, these device charging circuits cannot achieve independent and precise charging control for multiple battery packs when dealing with multi-battery management scenarios. Utility Model Content

[0003] The present invention aims to solve, at least to some extent, one of the technical problems in the related art.

[0004] Therefore, the first objective of this utility model is to provide a device charging circuit that sets up a battery management module for each battery pack to monitor the status data of the battery pack. Each battery management module is connected to the control module via a communication bus. Each battery management module sends its status data to the control module. After obtaining the status data of each battery pack, the control module generates control commands for each battery pack based on the status data and sends the control commands to the corresponding battery management module. The battery management module then executes the corresponding charging control operation according to the received control commands, thereby achieving independent and precise charging control of multiple battery packs.

[0005] The second objective of this invention is to provide a chip.

[0006] The third objective of this invention is to propose a wearable device.

[0007] To achieve the above objectives, a first aspect of this utility model provides a device charging circuit, comprising: N battery packs, where N is an integer greater than or equal to 2; and N battery management modules, each of which is connected to one of the battery packs, for receiving status data reported by each of the battery management modules, generating control commands based on the status data, and sending them to the corresponding battery management module to achieve charging control of each of the battery packs.

[0008] The device charging circuit of this utility model embodiment sets up a battery management module for each battery pack to monitor the status data of the battery pack. Each battery management module is connected to the control module through a communication bus. Each battery management module sends the status data to the control module. After obtaining the status data of each battery pack, the control module generates control commands for each battery pack based on the status data and sends the control commands to the corresponding battery management module. The battery management module executes the corresponding charging control operation according to the received control commands to achieve independent and precise charging control of multiple battery packs.

[0009] In addition, the device charging circuit proposed in the first aspect embodiment of this utility model may also have the following additional technical features:

[0010] In some embodiments of this utility model, the charging circuit of the above-mentioned device further includes:

[0011] Charging port;

[0012] N switch modules, each of which is connected between the charging interface and the corresponding battery pack, are used to control the conduction or cutoff of the charging circuit of the corresponding battery pack.

[0013] Each of the battery management modules is further configured to generate and output a switch control signal according to the control instructions issued by the control module, so as to control the charging circuit status of each battery pack.

[0014] In some embodiments of this utility model, any of the aforementioned switching modules includes: a first switching transistor, a second switching transistor, a first diode, and a second diode; wherein,

[0015] The first terminal of the first switching transistor is connected to the charging interface and the anode of the first diode, respectively;

[0016] The first terminal of the second switching transistor is connected to the anode of the second diode and the corresponding battery pack, respectively;

[0017] The second terminal of the first switching transistor is connected to the second terminal of the second switching transistor, the cathode of the first diode, and the cathode of the second diode, respectively.

[0018] The control terminals of the first and second switching transistors are both connected to the corresponding battery management modules to receive the switching control signals.

[0019] In some embodiments of this utility model, the charging circuit of the above-mentioned device further includes:

[0020] A power conversion module is connected between the charging interface of the device charging circuit and the control module. It is used to convert the voltage of the external power source into the operating voltage required by the control module when an external power source is detected, and to supply power to the control module.

[0021] The power conversion module is also used to generate a power access indication signal and send the power access indication signal to the control module.

[0022] The control module is further configured to generate a charging control command in response to receiving the power access indication signal, and to send the charging control command to each of the battery management modules to manage the charging process of each battery pack.

[0023] In some embodiments of this utility model, the charging circuit of the above-mentioned device further includes:

[0024] N battery protection modules are connected in series in the charging circuit of the corresponding battery pack and are connected to the corresponding battery pack. They are used to automatically cut off the charging circuit of the corresponding battery pack when any operating parameter exceeds the preset safety threshold for a set number of times or for a set duration threshold.

[0025] In some embodiments of this utility model, the charging circuit of the above-mentioned device further includes:

[0026] N DC-DC converter modules are connected between the corresponding switching module and the battery pack in the charging circuit of the device. They are used to adjust the voltage output to the battery pack during the charging process to adapt to the charging requirements of each battery pack.

[0027] In another embodiment of this utility model, the device charging circuit is applied to a wearable device;

[0028] N battery packs, including: a first battery pack and a second battery pack;

[0029] The first battery pack and the second battery pack are respectively disposed in the two extension components of the wearable device.

[0030] In some embodiments of this utility model, the wearable device includes a first extension component, a second extension component, and a device body, wherein the first extension component and the second extension component are respectively disposed on both sides of the device body; wherein,

[0031] The first battery pack includes a first single cell and a second single cell connected in parallel, wherein the first single cell has a first extension component disposed at one end away from the device body, and the second single cell has a first extension component disposed at one end close to the device body.

[0032] And / or, the second battery pack includes a third individual battery cell, wherein the third individual battery cell is disposed at one end of the second extension member away from the device body.

[0033] In some embodiments of this utility model, the first single cell and the second single cell are connected in parallel.

[0034] In some embodiments of this utility model, the communication bus is any one of the following:

[0035] I 2 C (Inter-Integrated Circuit) bus;

[0036] SPI (Serial Peripheral Interface) bus;

[0037] UART (Universal Asynchronous Receiver / Transmitter) bus.

[0038] To achieve the above objectives, a third aspect of this utility model provides a chip comprising the aforementioned device charging circuit.

[0039] To achieve the above objectives, a third aspect of this utility model provides a wearable device, including the aforementioned device charging circuit.

[0040] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention, but do not constitute an undue limitation of the present invention.

[0042] Figure 1 This is a schematic diagram of a device charging circuit according to some embodiments of the present invention;

[0043] Figure 2 This is a schematic diagram of smart glasses according to some embodiments of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0045] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this utility model. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this utility model as detailed in the appended claims.

[0046] The following description, with reference to the accompanying drawings, describes the device charging circuit, chip, and wearable device according to embodiments of the present invention.

[0047] Figure 1 This is a schematic diagram of a device charging circuit according to some embodiments of the present invention.

[0048] like Figure 1 As shown, the device charging circuit 100 of this utility model embodiment includes: N battery packs 110, N battery management modules 120 and control module 130, where N is an integer greater than or equal to 2.

[0049] Each battery management module 120 is connected one-to-one with a battery pack 110. The battery management module 120 monitors the status data of the corresponding battery pack 110 (including but not limited to the charging voltage, charging current, and temperature of the battery pack 110). The control module 130 communicates with each battery management module 120 via a communication bus. The control module 130 acquires the status data of each battery pack 110, generates control commands for each battery pack 110 based on the status data, and sends the control commands to the corresponding battery management module 120. The power management module 120 receives the control commands from the control module 130 and executes corresponding charging control operations according to the received control commands to ensure that the battery pack 110 operates under safe and stable conditions. In this embodiment of the invention, the communication bus used is as shown in Figure I. 2 Any one of the following: C bus, SPI bus, or UART bus.

[0050] After the power management system 100 starts up, it detects the status data of all battery packs through the control module 130. During this process, it needs to be confirmed that the discharge protection status FProtStat.IsDis of all battery packs is inactive. If the discharge protection status of any battery pack is found to be activated, the power management system 100 will enter an abnormal handling procedure to ensure the safety of the power management system 100.

[0051] The control module 130 initiates a voltage extreme value detection program every 500ms. This program performs a comprehensive scan of the discharge voltage of individual cells in all battery packs, and records in detail the highest discharge voltage V of a single cell. Max and the lowest discharge voltage of a single cell V Min This provides a basis for subsequent battery status assessment and charging control.

[0052] During each monitoring cycle, the contents of the alarm register will be automatically cleared to ensure timely updates and accuracy of alarm information, and to avoid interference with the normal judgment of the system due to old alarm information. It will also monitor and record abnormal states in real time. For example, when an abnormal state occurs 3 times, the power management system 100 will immediately trigger the protection mechanism and take corresponding protection measures, such as stopping the charging and discharging operation and issuing an alarm signal, to prevent the power management system 100 from being damaged due to abnormal conditions.

[0053] The charging circuit 100 of this embodiment adopts a design architecture where each battery pack 110 is equipped with a separate battery management module 120. This design allows each power management module to focus on monitoring the status data of its corresponding battery pack 110. Each battery management module is connected to the control module via a communication bus, and each battery management module sends this status data to the control module 130 in a timely and accurate manner. Based on the status data of each battery pack 110, the control module 130 generates control commands for each battery pack 110 and sends them to the corresponding power management module. Finally, the battery management module 120 executes the received control commands to complete the corresponding charging control operation, thereby achieving the goal of independent and precise charging control of multiple battery packs 110, effectively improving the performance, reliability, and safety of the charging circuit 100.

[0054] like Figure 1 As shown, the device charging circuit 100 of this utility model embodiment further includes: a charging interface (not shown in the figure) and N switch modules 140.

[0055] The charging interface is connected in parallel to the load terminals in the device to the system power bus VSYS (System Power Supply). Each switch module 140 is connected between the charging interface (equivalent to the system power bus VSYS) and the corresponding battery pack 110, and is used to control the on / off state of the charging and discharging circuits of the corresponding battery pack 110. Each battery management module 120 is also used to generate and output switch control signals according to the control commands issued by the control module 130, so as to control the charging circuit state of each battery pack 110.

[0056] For example, in a charging scenario, if an external charging device, such as an external power source, is connected to the charging interface, the control module 130 detects the voltage or current change signal of the charging interface. The control module 130 then requests status data for each battery pack 110 from each battery management module 120. Each battery management module 120 feeds back the status data of the connected battery pack 110. Based on this status data, the control module 130 formulates a charging strategy, such as prioritizing charging the battery pack 110 with the lowest charge, and issues a charging command to the corresponding battery management module 120. The battery management module 120 generates a switch control signal, enabling the switch module 140 connecting the system power bus VSYS to the corresponding battery pack 110 to conduct. Charging current flows into the battery pack 110 through the charging interface, the system power bus VSYS, and the switch module 140 to begin charging. During charging, the battery management module 120 continuously monitors and feeds back the status data of the battery pack 110, and the control module 130 adjusts the charging strategy as needed, stopping charging when the battery is fully charged or reaches the cutoff condition.

[0057] In addition, during the discharge scenario, the load in the wearable device is connected to the load terminal. Changes in the load terminal signal trigger the control module 130 to initiate the discharge process. After acquiring the status data of each battery pack 110, the control module 130 selects a suitable battery pack 110 according to a preset algorithm, such as issuing an instruction to the corresponding battery management module 120 to discharge the battery pack 110 with high remaining power. This battery management module 120 generates a switch control signal, connecting the system power bus VSYS to the switch module 140 of the battery pack 110. The power from the battery pack 110 is output from the load terminal via the switch module 140 and the system power bus VSYS to power the load. During discharge, the battery management module 120 monitors and provides feedback on the status data of the battery pack 110 in real time, and the control module 130 adjusts accordingly, stopping the discharge when the load stops working or the battery pack 110's power is insufficient. The preset algorithm could, for example, prioritize the battery packs based on their remaining power, using the remaining power level as the criterion; the higher the remaining power, the higher the priority, thus prioritizing battery packs with high remaining power as the battery packs to be discharged. Of course, this example of a preset algorithm is only one of many feasible solutions, and the selection and setting of algorithms in actual applications are far more extensive than this. The design of a preset algorithm needs to comprehensively consider factors such as battery characteristics and load requirements. Those skilled in the art can flexibly and reasonably set the algorithm according to the complexity of the actual scenario, performance requirements, and other actual conditions to ensure that the power management system 100 can achieve efficient, stable, and safe operation under different operating conditions.

[0058] For example, such as Figure 1 As shown, any switching module 140 includes: a first switching transistor Q1, a second switching transistor Q2, a first diode D1, and a second diode D2; wherein,

[0059] The first terminal of the first switching transistor Q1 is connected to the system power bus VSYS and the anode of the first diode D1, respectively.

[0060] The first terminal of the second switch Q2 is connected to the anode of the second diode D2 and the corresponding battery pack 110, respectively.

[0061] The second terminal of the first switch Q1 is connected to the second terminal of the second switch Q2, the cathode of the first diode D1, and the cathode of the second diode D2, respectively.

[0062] The control terminals of the first switch Q1 and the second switch Q2 are both connected to the corresponding battery management module 120 to receive switch control signals.

[0063] When charging the battery pack 110, the battery management module 120 outputs a corresponding switch control signal to turn on the second switch Q2 on the side connected to the battery pack 110 (i.e., the side of the second switch Q2). At this time, the current from the external power supply can flow smoothly through the first diode D1 and the turned-on second switch Q2 to the corresponding battery pack 110, charging the battery pack 110. Simultaneously, the first switch Q1 on the side connected to the system power bus VSYS (i.e., the side of the first switch Q1) is in the off state. The first diode D1 plays an important role in the circuit; it can provide freewheeling under specific operating conditions and prevent current from flowing back into the system power bus VSYS, ensuring the stability of the charging process. The current mainly forms a complete charging path through the second switch Q2.

[0064] When discharging the battery pack 110, the battery management module 120 outputs a corresponding switch control signal to turn on the first switch Q1 on the side connected to the system power bus VSYS (i.e., the side of the first switch Q1). In this way, the electrical energy stored in the battery pack 110 can be output to the system power bus VSYS through the second diode D2 and the turned-on first switch Q1, thereby supplying power to the load in the system 100. Simultaneously, the second switch Q2 on the side connected to the battery pack 110 (i.e., the side of the second switch Q2) is in the off state. The second diode D2 also serves to prevent reverse current, avoiding damage to the battery pack 110 from reverse current during discharge; the current mainly forms the discharge path through the first switch Q1.

[0065] The structure of the switch module 140 proposed in this embodiment of the present invention (which can be considered as a bidirectional switch circuit structure) allows current to flow flexibly in both the charging and discharging directions, thereby achieving precise and flexible control over the battery charging and discharging process.

[0066] In some embodiments of this utility model, the power management system 100 of this utility model further includes a power conversion module 150. For example, as Figure 1 As shown, the power conversion module 150 is connected between the charging interface and the control module 130. It is used to convert the voltage of the external power supply into the operating voltage required by the control module 130 when the external power supply is detected, and to supply power to the control module 130.

[0067] The power conversion module 150 is also used to generate a power access indication signal and send the power access indication signal to the control module 130. The control module 130 is also used to generate a charging control command in response to receiving the power access indication signal and send the charging control command to each battery management module 120 to manage the charging process of each battery pack 110.

[0068] When an external power source is connected to the charging interface, the voltage or current sensor at the charging interface quickly detects this change and transmits the relevant signal to the power conversion module 150. Upon receiving the signal, the power conversion module 150 immediately starts operating, and its internal circuitry begins to convert the voltage input from the external power source. Through operations such as transformer, rectification, and regulation, the voltage of the external power source is converted into the operating voltage required by the control module 130, thereby supplying power to the control module 130 and ensuring that the control module 130 can start and operate normally.

[0069] Meanwhile, after completing voltage conversion and confirming normal external power supply access, the power conversion module 150 generates a clear power access indication signal. This signal can be sent to the control module 130 via a pre-defined communication line in a specific voltage level or data format. Upon receiving the power access indication signal, the control module 130's internal program responds immediately. Based on a preset charging management strategy and algorithm, and combined with the current system 100 status and the status data of each battery pack 110, the control module 130 generates targeted charging control commands. These charging control commands may include key parameters such as charging current magnitude and charging cutoff conditions. Then, the control module 130 accurately sends the generated charging control commands to each battery management module 120 via the communication bus. After receiving the commands, each battery management module 120 manages the charging process of the connected battery pack 110 according to the requirements of the control commands, such as controlling the on / off state of the switch module 140 to adjust the charging circuit, ensuring that each battery pack 110 can be charged safely and efficiently. The pre-defined communication line includes I... 2Buses such as C-bus, SPI bus, and UART bus can be used. Preset charging management strategies and algorithms can be set based on the characteristics of the battery charge-discharge curve, gradually reducing the charging current to trickle charging when the battery voltage reaches 4.2V. Of course, this example of a preset charging management strategy and algorithm is only one of many feasible solutions; the selection and setting of charging management strategies and algorithms in actual applications are far more extensive. The design of charging management strategies and algorithms needs to comprehensively consider factors such as battery characteristics and load requirements. Those skilled in the art can flexibly and reasonably set charging management strategies and algorithms according to the complexity of the actual scenario, performance requirements, and other practical considerations to ensure that the power management system 100 can achieve efficient, stable, and safe operation under different operating conditions.

[0070] In some embodiments of this utility model, the power management system 100 of this utility model further includes: N battery protection modules 160. For example, as... Figure 1 As shown, each battery protection module 160 is connected in series in the charging circuit of the corresponding battery pack 110 and is connected to the corresponding battery pack 110. It is used to detect the operating parameters of the corresponding battery pack 110 and automatically cut off the charging circuit of the corresponding battery pack 110 when any operating parameter exceeds the preset safety threshold for a set number of times or the duration exceeds the preset duration threshold.

[0071] For example, when any operating parameter (such as voltage, current, and temperature) exceeds a preset safety threshold, the battery protection module 160 will not immediately cut off the circuit. Instead, it will activate a dual-criteria protection mechanism. On the one hand, it will record the number of times the parameter exceeds the preset safety threshold consecutively; on the other hand, it will monitor the duration of the parameter's over-limit state. Only when any operating parameter exceeds the preset safety threshold consecutively for a preset number of times, or when the duration exceeds a preset duration threshold, will the battery protection module 160 automatically cut off the charging circuit of the corresponding battery pack 110 to prevent the fault from escalating further.

[0072] This invention, by configuring an independent battery protection module 160 for each battery pack 110, can not only accurately determine whether the operating parameters of the battery pack 110 exceed the safe range, but also effectively distinguish between transient interference and real faults. Transient interference is often only temporary, with fewer instances of parameter exceeding limits and shorter duration, while real faults cause parameters to continuously exceed limits. By combining the two key factors of "number of consecutive exceedances" and "duration" for comprehensive judgment, false alarms caused by transient interference are avoided, greatly improving the accuracy and reliability of the protection.

[0073] In some embodiments of this utility model, the device charging circuit 100 further includes: N DC-DC conversion modules (not shown in the figure), each DC-DC conversion module is connected between the corresponding switch module 140 and the battery pack 110, and is used to adjust the voltage output to the battery pack 110 during the charging process to adapt to the charging requirements of each battery pack 110.

[0074] The control module 130 is also used to determine, based on the status data of each battery pack 110, when the corresponding battery pack 110 is in the constant current charging stage or the input voltage on the system power bus is greater than the charging voltage of the battery pack 110, generate a buck mode control command and send the buck mode control command to each battery management module 120 to control the DC-DC converter module corresponding to the corresponding battery pack 110 to enter the buck mode and achieve a reasonable reduction in voltage.

[0075] Alternatively, based on the status data of each battery pack 110, when it is determined that the input voltage on the system power bus is less than or equal to the charging voltage of the battery pack 110, a boost mode control command is generated and sent to each battery management module 120 to control the DC-DC converter module corresponding to the corresponding battery pack 110 to enter boost mode and increase the output voltage to meet the charging requirements of the battery pack 110.

[0076] In other words, the control module 130 continuously monitors the system charging activation flag Status.ChargingActive in real time. Once charging activation is detected, it performs a detailed check on the battery charging status register ChgStat to fully understand the battery's charging status information.

[0077] When the battery pack is detected to be in a constant current (CC) or constant voltage (CV) phase, the stepDown flag is set to True. This is done to reduce the charging voltage output by the DC-DC converter module, decreasing the voltage difference between the drain and source of the charging FET (Field Effect Transistor, here referring to the second diode Q2), thereby effectively controlling heat generation. For example, using the thermal calculation formula P_diss = I_CHG × (V_IN - V_BATT), if I_CHG is 500mA, the input voltage V_IN (i.e., the system power bus) is 5.0V, and the battery voltage V_BATT (the charging voltage of battery pack 110) is 4.0V, then the power loss P_diss is 500mA × (5.0V - 4.0V) = 500mW. After the step-down process, the power loss may be reduced to 350mW, significantly improving the safety and stability of the charging process.

[0078] If the Dropout flag of the battery pack is detected to be activated, the stepUp flag is set to True. This is to increase the charging voltage output by the DC-DC converter module to compensate for line losses, ensure that the battery pack can maintain a stable charging state, and avoid problems such as charging interruption or low charging efficiency due to insufficient voltage.

[0079] The control module 130 will update the status code to 0xF7FF and clear the charging alarm bit. This operation can effectively prevent the protection mechanism from being activated due to accidental triggering, ensuring that the power management system is not subject to unnecessary interference during normal charging, and improving the reliability and stability of the system.

[0080] The control module 130 dynamically adjusts the output voltage of the DC-DC converter module based on the stepDown and stepUp flags.

[0081] When stepDown = True, the DC-DC converter module will reduce the output voltage by one level (e.g., by 50mV) to meet the charging requirements of constant current or constant voltage stages and reduce the risk of overheating.

[0082] When stepUp = True, the DC-DC converter module will increase the output voltage by one level to compensate for line losses and ensure that the battery pack can obtain sufficient charging voltage.

[0083] When neither the stepDown nor stepUp flags are activated, the DC-DC converter module will maintain the current output voltage to ensure the stability of the charging process.

[0084] The voltage adjustment range of the DC-DC converter module can be set to 3.8V-4.5V (this range is applicable to lithium-ion batteries, etc.) to meet the charging requirements of different types of battery packs.

[0085] In some embodiments of this utility model, the status data of this utility model includes the temperature of each battery pack 110;

[0086] The control module 130 is also configured to, in response to detecting that the temperature of any battery pack 110 exceeds a first set temperature threshold (e.g., 45°C), generate a charging current adjustment command and send the charging current adjustment command to each battery management module 120 to reduce the charging current of the corresponding battery pack 110. In this way, when the temperature of the battery pack 110 shows an abnormal upward trend but has not yet reached a dangerous level, reducing the charging current slows down the rate of chemical reactions inside the battery, thereby effectively controlling further increases in battery temperature and ensuring the safety and stability of the battery charging process.

[0087] The control module 130 is also configured to generate a thermal protection control command in response to detecting that the temperature of any battery pack 110 exceeds a second set temperature threshold (e.g., 60°C), and send the thermal protection control command to each battery management module 120. After receiving the command, the battery management module 120 will take one of two protection measures according to the actual situation: First, control the DC-DC converter module corresponding to the corresponding battery pack 110 to enter the buck mode, that is, reduce the voltage output to the battery pack 110, thereby reducing the charging power and lowering the battery temperature; Second, cut off the charging circuit of the corresponding battery pack 110, that is, completely stop charging the battery pack 110, avoid serious safety accidents such as thermal runaway caused by high temperature, and protect the battery pack 110 and the entire device charging circuit 100 to the greatest extent.

[0088] In some embodiments of this utility model, the status data also includes the charging voltage and charging current of each battery pack 110;

[0089] The control module 130 is also configured to respond to situations where the charging voltage of each battery pack 110 is greater than a set voltage threshold and the charging current is less than a set current threshold, indicating that the battery pack 110 has essentially reached a fully charged state. At this point, the control module generates a charging completion command and sends it to the corresponding battery management module 120. Upon receiving the charging completion command, the battery management module 120 cuts off the charging circuit of the corresponding battery pack 110, stopping further charging of that battery pack 110. This method avoids damage to the battery pack 110 due to overcharging, effectively extending the lifespan of the battery pack 110, while simultaneously ensuring the safety and stability of the entire device's charging circuit 100 during the charging process.

[0090] When the control module 130 detects that all batteries have reached the full charge voltage (for example, the common full charge voltage for lithium-ion batteries is 4.2V) and have successfully entered the trickle charging stage, it will automatically trigger the charging termination process and execute the following series of operations in sequence:

[0091] It will send a shutdown command to the DC-DC converter module to stop its output voltage, cut off the voltage regulation link in the charging process, and avoid unnecessary energy loss and potential safety risks;

[0092] The flag indicating the presence of the charger is cleared to accurately identify that the current charging state has ended, preparing for subsequent operations.

[0093] The blocking state set in the device charging circuit 100 due to various reasons (such as abnormal voltage, overcurrent, etc.) is completely reset to restore normal communication and control functions and ensure that it enters standby or other working states.

[0094] The status register value is updated to the standby code, which clearly indicates that the device charging circuit 100 is currently in standby mode, facilitating status monitoring and management by the control module 130, and also providing accurate initial status information for subsequent startup and operation.

[0095] To ensure voltage balance among the battery packs 110 and improve the overall performance and lifespan of the battery pack, the control module 130 employs the following voltage balance maintenance strategy:

[0096] The voltage of each battery pack 110 is allowed to naturally equalize within a range of 400mV. During normal charging and discharging, the battery voltage may deviate to some extent due to individual differences in the batteries, but as long as the deviation is within 400mV, the system will not intervene, allowing the batteries to achieve natural equalization through their own characteristics.

[0097] When the voltage deviation between battery packs 110 exceeds the threshold of 400mV, the system will reactivate the blocking mechanism. By blocking the charging and discharging operations of the relevant batteries, the system prevents the voltage deviation from expanding further and protects the batteries from damage. Simultaneously, the system will continuously monitor voltage changes, and once the voltage deviation returns to the allowable range, the blocking mechanism will be deactivated, restoring the normal charging function of the batteries.

[0098] In some embodiments of this utility model, the status data also includes the discharge voltage of each battery pack 110;

[0099] The control module 130 is also used to generate discharge control commands based on the discharge voltage of each battery pack 110, and send the discharge control commands to the corresponding battery management module 120. After receiving the discharge control commands, the battery management module 120 manages the discharge process of each battery pack 110.

[0100] For example, when the control module 130 detects that the discharge voltage of any battery pack 110 is lower than the set lower voltage limit (e.g., the system minimum operating voltage VSYS_MIN = 3000mV, i.e., 3.0V), this indicates that the battery pack 110 may be close to being depleted or experiencing abnormal discharge. To prevent the battery pack 110 from being damaged due to over-discharge, the control module 130 generates a discharge prohibition command and sends it to the corresponding battery management module 120. Upon receiving the discharge prohibition command, the battery management module 120 immediately cuts off the discharge circuit of the corresponding battery pack 110, stopping its continued discharge and ensuring the safety of the battery pack 110.

[0101] For example, when the control module 130 detects that the discharge voltage of any battery pack 110 is greater than or equal to a set lower voltage limit, and the voltage difference between any two battery packs 110 is greater than a set difference threshold (which can be set according to actual needs), this indicates that there is a discharge imbalance problem among the battery packs 110. Long-term discharge imbalance may lead to overuse of some battery packs 110, shortening their lifespan and affecting the performance of the entire battery pack. Therefore, the control module 130 generates a discharge equalization adjustment command and sends it to the corresponding battery management module 120. Based on the received discharge equalization adjustment command, the power management module controls the battery pack 110 with the higher discharge voltage to reduce its discharge current or pause discharge, thereby promoting a more balanced discharge process among the battery packs 110 and extending the lifespan of each battery pack 110.

[0102] In some embodiments of this utility model, the status data also includes the discharge protection status of each battery pack 110;

[0103] When the control module 130 detects that the discharge protection state of any battery pack 110 has been activated, it means that an abnormal condition such as overcurrent or short circuit has occurred during the discharge process of that battery pack 110, triggering its own protection mechanism. To prevent the fault from escalating further and to ensure the safe and stable operation of the system 100, the control module 130 generates a discharge cut-off command and sends it to the corresponding battery management module 120. Upon receiving the discharge cut-off command, the power management module disconnects the discharge circuit of the corresponding battery pack 110, promptly isolating the faulty battery pack 110 and preventing adverse effects on the entire device charging circuit 100.

[0104] In another embodiment of this utility model, the device charging circuit 100 can be applied to wearable devices;

[0105] N battery packs 110, including: a first battery pack and a second battery pack; wherein the first battery pack and the second battery pack are respectively disposed in two extension components of the wearable device.

[0106] like Figure 2 As shown, the wearable device is illustrated using smart glasses as an example. The wearable device includes a first extension component 210, a second extension component 220, and a device body 230. The first extension component 210 and the second extension component 220 are respectively disposed on both sides of the device body 230; wherein,

[0107] The first battery pack includes a first single cell 111 and a second single cell 112 connected in parallel. The first single cell 111 is disposed at the end of the first extension member 210 away from the device body 230, and the second single cell 112 is disposed at the end of the first extension member 210 close to the device body 230.

[0108] And / or, the second battery pack includes a third single cell 113, wherein the third single cell 113 is disposed at the end of the second extension 220 away from the device body 230.

[0109] In some embodiments of this utility model, the first single cell and the second single cell are connected in parallel via a flexible circuit board. For example, the first single cell and the second single cell are electrically connected in parallel via a flexible circuit board or a conductive wire.

[0110] In summary, the charging circuit of this utility model embodiment provides a battery management module for each battery pack to monitor its status data. Each battery management module is connected to the control module via a communication bus. Each battery management module sends its status data to the control module. After obtaining the status data of each battery pack, the control module generates control commands for each battery pack based on the status data and sends the control commands to the corresponding battery management module. The battery management module then executes the corresponding charging control operation according to the received control commands, thereby achieving independent and precise charging control for multiple battery packs.

[0111] Based on the above embodiments, this utility model also proposes a chip, including the above-described device charging circuit.

[0112] In the embodiments of this application, the chip may be an application-specific integrated circuit (ASIC) or a field-programmable gate array (FPGA), etc.

[0113] Based on the above embodiments, this utility model also proposes a wearable device, including the device charging circuit described above.

[0114] In some embodiments of this invention, the wearable device may be smart glasses.

[0115] When the power management system 100 of this utility model embodiment is applied to smart glasses, the N battery packs 110 include: a first battery pack and a second battery pack; wherein, the first battery pack and the second battery pack are respectively disposed in the two temples of the wearable device.

[0116] like Figure 2 As shown, the wearable device includes a first temple 210, a second temple 220, and a frame 230, with the first temple 210 and the second temple 220 respectively disposed on both sides of the frame 230; wherein,

[0117] The first battery pack includes a first single battery 111 and a second single battery 112 connected in parallel. The first single battery 111 is located at the end of the first temple 210 away from the frame 230, and the second single battery 112 is located at the end of the first temple 210 close to the frame 230.

[0118] And / or, the second battery pack includes a third individual battery 113, wherein the third individual battery 113 is disposed at the end of the second temple 220 away from the frame 230.

[0119] In some embodiments of this utility model, the first single cell and the second single cell are electrically connected in parallel via a flexible circuit board or a conductive wire.

[0120] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0121] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0122] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

[0123] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A device charging circuit, characterized in that, include: There are N battery packs, where N is an integer greater than or equal to 2; N battery management modules, each connected to one of the battery packs, are used to monitor the status data of the corresponding battery pack; The control module is connected to each of the battery management modules via a communication bus. It receives status data reported by each of the battery management modules, generates control commands based on the status data, and sends them to the corresponding battery management modules to realize charging control of each battery pack.

2. The device charging circuit according to claim 1, characterized in that, Also includes: Charging port; N switch modules, each of which is connected between the charging interface and the corresponding battery pack, are used to control the conduction or cutoff of the charging circuit of the corresponding battery pack. Each of the battery management modules is further configured to generate and output a switch control signal according to the control instructions issued by the control module, so as to control the charging circuit status of each battery pack.

3. The device charging circuit according to claim 2, characterized in that, Any of the aforementioned switching modules includes: a first switching transistor, a second switching transistor, a first diode, and a second diode; wherein, The first terminal of the first switching transistor is connected to the charging interface and the anode of the first diode, respectively. The first terminal of the second switching transistor is connected to the anode of the second diode and the corresponding battery pack, respectively; The second terminal of the first switching transistor is connected to the second terminal of the second switching transistor, the cathode of the first diode, and the cathode of the second diode, respectively. The control terminals of the first and second switching transistors are both connected to the corresponding battery management modules to receive the switching control signals.

4. The device charging circuit according to any one of claims 1-3, characterized in that, Also includes: A power conversion module is connected between the charging interface of the device's charging circuit and the control module. It is used to convert the voltage of the external power source into the operating voltage required by the control module when an external power source is detected, and to supply power to the control module. The power conversion module is also used to generate a power access indication signal and send the power access indication signal to the control module. The control module is further configured to generate a charging control command in response to receiving the power access indication signal, and to send the charging control command to each of the battery management modules to manage the charging process of each battery pack.

5. The device charging circuit according to any one of claims 1-3, characterized in that, Also includes: N battery protection modules are connected in series in the charging circuit of the corresponding battery pack and are connected to the corresponding battery pack. They are used to automatically cut off the charging circuit of the corresponding battery pack when any operating parameter exceeds the preset safety threshold for a set number of times or for a set duration threshold.

6. The device charging circuit according to any one of claims 1-3, characterized in that, Also includes: N DC-DC converter modules are connected between the corresponding switching module and the battery pack in the charging circuit of the device. They are used to adjust the voltage output to the battery pack during the charging process to adapt to the charging requirements of each battery pack.

7. The device charging circuit according to any one of claims 1-6, characterized in that, The device charging circuit is used in wearable devices; N battery packs, including: a first battery pack and a second battery pack; The first battery pack and the second battery pack are respectively disposed in the two extension components of the wearable device.

8. The device charging circuit according to claim 7, characterized in that, The wearable device includes a first extension component, a second extension component, and a device body, wherein the first extension component and the second extension component are respectively disposed on both sides of the device body; wherein, The first battery pack includes a first single cell and a second single cell connected in parallel, wherein the first single cell has a first extension component disposed at one end away from the device body, and the second single cell has a first extension component disposed at one end close to the device body. And / or, the second battery pack includes a third individual battery cell, wherein the third individual battery cell is disposed at one end of the second extension member away from the device body.

9. The device charging circuit according to claim 8, characterized in that, The first and second individual cells are connected in parallel.

10. The device charging circuit according to any one of claims 1-9, characterized in that, The communication bus is any one of the following: I 2 C-bus; SPI bus; UART bus.

11. A chip, characterized in that, include: The device charging circuit as described in any one of claims 1-10.

12. A wearable device, characterized in that, include: The device charging circuit as described in any one of claims 1-10.

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