Voltage control method, battery charging circuit and atomization device

Abstract

The application provides a voltage control method, a battery charging circuit and an atomization device, and belongs to the technical field of battery management. The voltage control method comprises the following steps: collecting a target battery voltage of a battery; determining a target voltage difference corresponding to the target battery voltage according to a corresponding relationship between voltage differences of both ends of a linear charging chip and battery voltages, and determining a sum of the target battery voltage and the target voltage difference to obtain a target input voltage of the linear charging chip; and controlling a voltage regulation module to convert a power supply voltage provided by an external charging device into the target input voltage and then output the target input voltage to the linear charging chip, wherein the voltage difference in the corresponding relationship is less than a voltage difference threshold, and the voltage differences corresponding to at least part of the battery voltages are different.

Description

Technical Field

[0001] This application belongs to the field of battery management technology, specifically relating to a voltage control method, a battery charging circuit, and an atomizing device. Background Technology

[0002] Linear charging chips are important components in the battery charging system of atomizing devices. They control the charging current and charging voltage of the battery through linear adjustment to ensure safe and efficient charging of the battery.

[0003] However, the input voltage of a linear charging chip is fixed, while the battery voltage gradually increases during charging. This results in a significant voltage difference between the input and output terminals of the linear charging chip over a certain period. According to the power loss formula, with a constant charging current, the power loss of a linear charging chip is directly proportional to the voltage difference across its terminals. Therefore, current linear charging chips suffer from high power loss and significant heat generation during battery charging, affecting the charging efficiency of the battery charging system. Summary of the Invention

[0004] This application provides a voltage control method, a battery charging circuit, and an atomizing device to solve the problems of high power loss and severe heat generation in current linear charging chips during battery charging.

[0005] To achieve the above objectives, the technical solutions provided in this application are as follows: In some embodiments, a voltage control method is provided, applied to the battery charging circuit of an atomizing device. The battery charging circuit includes a controller, a voltage regulation module, and a linear charging chip. The voltage regulation module is connected to an external charging device and is connected to the battery through the linear charging chip. The controller is connected to both the voltage regulation module and the battery. The method includes: Collect the target battery voltage of the battery; Based on the correspondence between the voltage difference across the linear charging chip and the battery voltage, the target voltage difference across the target battery voltage is determined, and the sum of the target battery voltage and the target voltage difference across the target is determined to obtain the target input voltage of the linear charging chip. The voltage regulation module controls the external charging device to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip. In this case, the voltage difference between the two ends in the correspondence is less than the voltage difference threshold, and at least some of the battery voltages correspond to different voltage differences between the two ends.

[0006] In some embodiments, determining the target voltage difference across the target battery voltage based on the correspondence between the voltage difference across the linear charging chip and the battery voltage includes: Based on the correspondence between multiple battery voltage ranges and the voltage difference across the terminals, the target voltage difference across the terminals corresponding to the battery voltage range to which the target battery voltage belongs is determined, wherein the voltage difference across the terminals corresponding to each battery voltage range is different.

[0007] In some embodiments, determining the target voltage difference across the battery voltage range corresponding to the target battery voltage based on the correspondence between multiple battery voltage ranges and the voltage difference across the terminals includes: When the target battery voltage is greater than or equal to the constant current charging start voltage, the target voltage difference across the terminals corresponding to the target battery voltage is determined based on the correspondence between the multiple battery voltage ranges during the constant current charging phase and the voltage difference across the terminals.

[0008] In some embodiments, during the constant current charging phase of the battery, the rate of increase in battery voltage decreases, and the voltage difference between the two ends first decreases and then increases.

[0009] In some embodiments, the voltage difference between the two ends in the correspondence satisfies the following condition: when the linear charging chip operates under the voltage difference between the two ends, the ratio of the charging current output by the linear charging chip to the battery to the rated charging current of the battery is greater than or equal to a target ratio threshold.

[0010] In some embodiments, the method further includes: If the target battery voltage is less than the constant current charging start voltage, the target input voltage of the linear charging chip is determined to be a preset voltage, which is less than the supply voltage.

[0011] In some embodiments, the method further includes: If the target battery voltage is greater than the constant current charging end voltage, the target input voltage of the linear charging chip is determined to be the supply voltage.

[0012] In some embodiments, the voltage regulation module is used to adjust the supply voltage according to the duty cycle of the control signal to obtain the input voltage of the linear charging chip; the control signal includes an initial control signal and a target control signal; controlling the voltage regulation module to convert the supply voltage provided by the external charging device into the target input voltage and then output it to the linear charging chip includes: The duty cycle of the initial control signal is adjusted based on the target input voltage to obtain the target control signal; The target control signal is output to the voltage regulation module so that the voltage regulation module adjusts the supply voltage according to the duty cycle of the target control signal to obtain the target input voltage and then outputs it to the linear charging chip.

[0013] In some embodiments, a battery charging circuit is provided for use in an atomizing device, the battery charging circuit comprising: a voltage regulation module, a linear charging chip, and a controller; The voltage regulation module is used to connect to an external charging device and to the battery through the linear charging chip. The voltage regulation module is used to convert the power supply voltage provided by the external charging device to obtain the input voltage of the linear charging chip and output the input voltage to the linear charging chip. The linear charging chip is used to adjust the charging voltage of the battery based on the input voltage and output the charging voltage to the battery; The controller is connected to the voltage regulation module and the battery respectively, and is used to execute the voltage control method described in any of the first aspects.

[0014] In some embodiments, an atomizing device is provided, the atomizing device comprising: a battery, and the battery charging circuit described in the second aspect.

[0015] In this embodiment, after acquiring the target battery voltage, the target voltage difference across the linear charging chip can be determined based on the correspondence between the voltage difference across the chip and the battery voltage. The sum of the target battery voltage and the target voltage difference is then calculated to obtain the target input voltage for the linear charging chip. This allows the voltage regulation module to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip. This enables dynamic adjustment of the output of the voltage regulation module before the linear charging chip, precisely controlling the input voltage of the linear charging chip. Furthermore, since the voltage difference across the chip is less than the voltage difference threshold, and at least some battery voltages correspond to different voltage differences, this technical solution allows the voltage difference across the linear charging chip to be adaptively optimized based on the real-time battery voltage, maintaining a relatively small value. This effectively reduces the operating temperature of the linear charging chip, decreases heat loss during battery charging, and improves the charging efficiency and energy utilization of the battery charging system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a battery charging circuit provided in an embodiment of this application; Figure 2This is a flowchart of a voltage control method provided in an embodiment of this application; Figure 3 This is a flowchart of another voltage control method provided in the embodiments of this application; Figure 4 This is a schematic diagram illustrating the voltage change across the two ends of a linear charging chip provided in an embodiment of this application.

[0018] Figure 5 This is a schematic diagram illustrating the change in the voltage difference across a linear charging chip provided in an embodiment of this application; Figure 6 This is a schematic diagram illustrating the change in battery voltage provided in an embodiment of this application; Figure 7 This is a schematic diagram illustrating the change in charging current provided in an embodiment of this application; Figure 8 This is a schematic diagram of chip temperature change provided in an embodiment of this application. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0020] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0021] The serial numbers assigned to components in this document, such as "first" and "second," are merely configured to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0022] Linear charging chips are important components in the battery charging system of atomizing devices. They control the charging current and charging voltage of the battery through linear adjustment to ensure safe and efficient charging of the battery.

[0023] However, the input voltage of a linear charging chip is fixed, while the battery voltage gradually increases during charging. This results in a significant voltage difference between the input and output terminals of the linear charging chip over a certain period. According to the power loss formula, with a constant charging current, the power loss of a linear charging chip is directly proportional to the voltage difference across its terminals. For example, the input voltage of a linear charging chip is typically fixed at 5V, but the battery voltage gradually increases from 3.0V to 4.2V during charging. This leads to a voltage difference of 1.0V-2.0V between the input and output terminals of the linear charging chip over a certain period. According to the power loss formula Ploss=(Vin-Vbat)×Ichg, when the charging current Ichg is a constant 1A, the power loss Ploss of the linear charging chip is directly proportional to the voltage difference Vin-Vbat, which can reach 1W-2W.

[0024] Clearly, current linear charging chips suffer from high power loss and severe heat generation during battery charging, which affects the charging efficiency of the battery charging system.

[0025] Please refer to Figure 1 The diagram illustrates a structural schematic of a battery charging circuit provided in an embodiment of this application. Figure 1 As shown, the battery charging circuit 1 includes: a voltage regulation module 11, a linear charging chip 12, and a controller 13.

[0026] The voltage regulation module 11 is used to connect to the external charging device 2 and is connected to the battery 3 through the linear charging chip 12. The voltage regulation module 11 is used to convert the power supply voltage provided by the external charging device 2 to obtain the input voltage of the linear charging chip 12 and output the input voltage to the linear charging chip 12.

[0027] The linear charging chip 12 is used to adjust the charging voltage of the battery 3 based on the input voltage and output the charging voltage to the battery 3.

[0028] The controller 13 is connected to the voltage regulation module 11 and the battery 3 respectively, and is used to execute any of the voltage control methods provided in the embodiments of this application, as detailed in the following description. Optionally, the controller 13 can be a microcontroller unit (MCU) or a central processing unit (CPU), etc.

[0029] In an optional embodiment, the voltage regulation module 11 can be used to adjust the supply voltage according to the duty cycle of the received control signal to obtain the input voltage of the linear charging chip 12, and output the input voltage to the linear charging chip 12. Optionally, the voltage regulation module 11 may include a direct current (DC) to DC conversion circuit. For example, a DC-DC conversion circuit with boost or buck-boost. Correspondingly, the control signal is a pulse-width modulation (PWM) signal. In the battery charging circuit 1, the controller 13 can execute any of the voltage control methods provided in the embodiments of this application to make the voltage regulation module 11 adjust the input voltage of the linear charging chip 12 under the control of the controller 13, so as to avoid excessive voltage difference between the input and output terminals of the linear charging chip 12, thereby effectively reducing the operating temperature of the linear charging chip 12, reducing the heat loss of the linear charging chip 12 during the battery charging process, and improving the charging efficiency and energy utilization rate of the battery charging system.

[0030] Please refer to Figure 2 The diagram illustrates a flowchart of a voltage control method provided in an embodiment of this application. The voltage control method can be applied to any battery charging circuit provided in this embodiment and is executed by a controller within that battery charging circuit. The battery charging circuit includes a voltage regulation module, a linear charging chip, and a controller. The voltage regulation module is used to connect to an external charging device and is connected to the battery via the linear charging chip. The controller is connected to both the voltage regulation module and the battery. Optionally, the battery charging circuit to which the voltage control method is applied can be... Figure 1 The battery charging circuit shown is illustrated. Figure 2 As shown, the voltage control method includes: Step 201: Collect the target battery voltage.

[0031] Optionally, the controller can periodically acquire signals from voltage sampling points connected to the positive and negative terminals of the battery through its built-in or external analog-to-digital converter to obtain the analog voltage signal of the battery, and then convert the analog voltage signal into a digital voltage signal to obtain the target battery voltage.

[0032] Step 202: Based on the correspondence between the voltage difference across the linear charging chip and the battery voltage, determine the target voltage difference across the target battery voltage, and determine the sum of the target battery voltage and the target voltage difference across the target battery to obtain the target input voltage of the linear charging chip.

[0033] In this embodiment, the voltage difference across the linear charging chip refers to the voltage difference between the input and output terminals of the linear charging chip. It should be noted that the output terminal of the linear charging chip is connected to the battery. Therefore, the voltage at the output terminal of the linear charging chip can be considered as the battery voltage.

[0034] In some embodiments, the controller may pre-store the correspondence between the voltage difference across the linear charging chip and the battery voltage, or it may read the correspondence between the voltage difference across the linear charging chip and the battery voltage from a third-party device. After acquiring the target battery voltage, the controller obtains the correspondence between the voltage difference across the linear charging chip and the battery voltage, and determines the voltage difference across the target battery voltage from this correspondence, thus obtaining the target voltage difference across the target battery voltage. Furthermore, the controller can calculate the sum of the target battery voltage and the target voltage difference across the target terminals to obtain the target input voltage of the linear charging chip, which is the target input voltage that the voltage regulation module needs to provide to the linear charging chip. This ensures that when the linear charging chip provides charging current to the battery, its voltage drop can be controlled within the preset target voltage difference across the target terminals, thus ensuring low heat loss of the linear charging chip.

[0035] Among them, the relationship between the voltage difference across the linear charging chip and the battery voltage defines the optimal voltage difference value across the linear charging chip for optimizing the heat damage of the linear charging chip under different battery voltages.

[0036] Specifically, in this correspondence, the voltage difference across each battery voltage is less than the target voltage difference threshold, and at least some battery voltages have different voltage differences across them. For example, in the case of a lithium battery, the target voltage difference threshold could be 0.93V or 0.91V, etc.

[0037] In one alternative implementation, the voltage difference across the linear charging chip and the battery voltage correspondence can be different for each battery voltage, so that each battery voltage is adapted to a different voltage difference across the linear charging chip. This avoids the impact of battery voltage differences on the heat loss of the linear charging chip to a certain extent, and ensures that the linear charging chip can always maintain a low heat loss.

[0038] In another optional implementation, in the correspondence between the voltage difference across the linear charging chip and the battery voltage, the voltage difference across each pair of adjacent battery voltages is the same, but the voltage difference across each pair of battery voltages is different. Specifically, the correspondence between the voltage difference across the linear charging chip and the battery voltage can be: a correspondence between multiple battery voltage ranges and the voltage difference across the linear charging chip. Each battery voltage range has a different voltage difference across it. Correspondingly, the process by which the controller determines the target voltage difference across the target battery voltage based on the correspondence between the voltage difference across the linear charging chip and the battery voltage can include: step S300, determining the target voltage difference across the battery voltage range to which the target battery voltage belongs based on the correspondence between multiple battery voltage ranges and the voltage difference across them, wherein each battery voltage range has a different voltage difference across it.

[0039] The controller can pre-store multiple correspondences between battery voltage ranges and the voltage difference across the linear charging chip, or it can read these correspondences from a third-party device to determine the target voltage difference corresponding to the target battery voltage. After acquiring the target battery voltage, the controller obtains the correspondences between multiple battery voltage ranges and the voltage difference across the linear charging chip, and determines the voltage difference corresponding to the battery voltage range to which the target battery voltage belongs, thus obtaining the target voltage difference. Furthermore, the controller can calculate the sum of the target battery voltage and the target voltage difference to obtain the target input voltage of the linear charging chip, which is the target input voltage that the voltage regulation module needs to provide to the linear charging chip. This ensures that when the linear charging chip provides charging current to the battery, its voltage drop can be controlled within the preset target voltage difference, guaranteeing low heat loss for the linear charging chip.

[0040] For example, the correspondence between multiple battery voltage ranges and the voltage difference across the linear charging chip includes: a first battery voltage range, a second battery voltage range, and a third battery voltage range, as well as a first voltage difference across the first battery voltage range, a second voltage difference across the second battery voltage range, and a third voltage difference across the third battery voltage range. Assume the target battery voltage belongs to the first battery voltage range. Then, the controller can determine the target voltage difference across the target terminals as the first voltage difference based on this correspondence, and determine the target input voltage of the linear charging chip: the sum of the first voltage difference across the target terminals and the target battery voltage.

[0041] Since the voltage difference across the linear charging chip can be considered the voltage difference between its input terminal and the battery, the smaller the change in battery voltage, the smaller the change in the voltage difference across the linear charging chip. Correspondingly, the change in heat loss of the linear charging chip is smaller. Therefore, by storing the correspondence between multiple battery voltage ranges and the voltage difference across the linear charging chip, and using this correspondence to adjust the input voltage of the linear charging chip, the controller can effectively reduce the data storage and processing volume compared to the input voltage adjustment method that uses the correspondence between each battery voltage and its voltage difference, while controlling the voltage drop of the linear charging chip to a smaller value, thus improving the efficiency of input voltage adjustment for the linear charging chip.

[0042] Step 203: The control voltage regulation module converts the power supply voltage provided by the external charging device into the target input voltage and outputs it to the linear charging chip.

[0043] Optionally, the controller can control the voltage regulation module to adjust the supply voltage provided by the external charging device to convert the supply voltage into a target input voltage and output the target input voltage to the linear charging chip. In some embodiments, the voltage regulation module is used to adjust the supply voltage according to the duty cycle of the control signal to obtain the input voltage of the linear charging chip; the control signal includes an initial control signal and a target control signal. Correspondingly, the process by which the controller controls the voltage regulation module to convert the supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip may include: The controller adjusts the duty cycle of the initial control signal based on the target input voltage to obtain the target control signal, and outputs the target control signal to the voltage regulation module so that the voltage regulation module adjusts the supply voltage according to the duty cycle of the target control signal to obtain the target input voltage and then outputs it to the linear charging chip.

[0044] As an example, an external charging device is used to provide a constant supply voltage. Therefore, with the circuit structure of the voltage regulation module fixed, the output voltage of the voltage regulation module (i.e., the input voltage of the linear charging chip) corresponds to the duty cycle of the control signal. The controller can store or read the correspondence between the output voltage of the voltage regulation module and the duty cycle of the control signal to determine the target duty cycle corresponding to the target input voltage based on this correspondence, adjust the duty cycle of the control signal to the target duty cycle, and output a target control signal with the target duty cycle to the voltage regulation module.

[0045] In another example, the controller can also acquire the actual input voltage of the linear charging chip and, based on the Proportional-Integral-Differential (PID) algorithm, calculate the error voltage between the target voltage and the actual input voltage to obtain the duty cycle corresponding to the error voltage. The controller then adjusts the duty cycle of the control signal to this duty cycle and outputs the adjusted control signal to the voltage regulation module. This allows the voltage regulation module to adjust the supply voltage according to the duty cycle of the control signal to obtain the target input voltage and output it to the linear charging chip. This ensures that when the linear charging chip provides charging current to the battery, its voltage drop can be controlled within the preset target voltage difference, thus ensuring low heat loss of the linear charging chip.

[0046] In this embodiment, after acquiring the target battery voltage, the target voltage difference across the linear charging chip can be determined based on the correspondence between the voltage difference across the chip and the battery voltage. The sum of the target battery voltage and the target voltage difference is then calculated to obtain the target input voltage for the linear charging chip. This allows the voltage regulation module to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip. This enables dynamic adjustment of the output of the voltage regulation module before the linear charging chip, precisely controlling the input voltage of the linear charging chip. Furthermore, since the voltage difference across the chip is less than the voltage difference threshold, and at least some battery voltages correspond to different voltage differences, this technical solution allows the voltage difference across the linear charging chip to be adaptively optimized based on the real-time battery voltage, maintaining a relatively small value. This effectively reduces the operating temperature of the linear charging chip, decreases heat loss during battery charging, and improves the charging efficiency and energy utilization of the battery charging system.

[0047] In some embodiments of this application, step S300, which determines the target voltage difference across the battery voltage range corresponding to the target battery voltage, based on the correspondence between multiple battery voltage ranges and the voltage difference across the terminals, may include: When the target battery voltage is greater than or equal to the constant current charging start voltage, the target voltage difference across the terminals corresponding to the target battery voltage is determined based on the correspondence between multiple battery voltage ranges and the voltage difference across the terminals during the constant current charging phase.

[0048] In optional embodiments, the battery charging process typically includes a pre-charge stage, a constant current charging stage, and a trickle charging stage. In the pre-charge stage, the linear charging chip typically outputs a low charging current to the battery to increase the battery voltage until it reaches the constant current charging start voltage (i.e., the pre-charge end voltage), at which point the battery enters the constant current charging stage. In the constant current charging stage, the linear charging chip provides a constant charging current to the battery to increase the battery voltage until it reaches the constant current charging end voltage (i.e., the trickle charging threshold), at which point the battery enters the trickle charging stage. During trickle charging, the battery approaches full charge, and the battery voltage correspondingly approaches the rated battery voltage. The linear charging chip then provides a gradually decreasing charging current to the battery to charge it until it is fully charged.

[0049] Clearly, the constant current charging initiation voltage can be used by the controller to determine that the battery has left the pre-charging state and entered the constant current charging stage, characterized by a constant high current. Specifically, after acquiring the target battery voltage, the controller can compare this target voltage with a preset constant current charging initiation voltage. If the target battery voltage is greater than or equal to the constant current charging initiation voltage, indicating that the battery is currently in the constant current charging stage, the controller can obtain the correspondence between multiple battery voltage ranges and the voltage difference across the terminals during the constant current charging stage. From this correspondence, the controller can determine the voltage difference across the terminals corresponding to the battery voltage range to which the target battery voltage belongs, thus obtaining the target voltage difference across the terminals corresponding to the target battery voltage. This allows the controller to calculate the sum of the target battery voltage and the target voltage difference across the terminals to obtain the target input voltage for the linear charging chip, which is the target input voltage that the voltage regulation module needs to provide to the linear charging chip. This ensures that when the linear charging chip provides charging current to the battery, its voltage drop can be controlled within the preset target voltage difference across the terminals, guaranteeing low heat loss for the linear charging chip.

[0050] Compared to the battery pre-charge and trickle charge stages, the linear charging chip experiences the greatest voltage drop damage during the constant current charging stage, which also constitutes the longest portion of the entire charging process. Therefore, the controller can determine when the battery charging process enters the constant current charging stage when the target battery voltage is greater than or equal to the constant current charging initiation voltage. By utilizing the correspondence between multiple battery voltage ranges and the voltage difference across the linear charging chip during this constant current charging stage, the voltage difference across the linear charging chip can be adaptively optimized based on the real-time battery voltage to maintain a consistently low value. This significantly reduces heat loss of the linear charging chip during battery charging while simplifying the voltage control process in the battery pre-charge and trickle charge stages, thus improving the controller's processing efficiency.

[0051] Optionally, in the correspondence between multiple battery voltage ranges and the voltage difference across the terminals during the constant current charging phase, the voltage difference across the terminals needs to satisfy the following: when the linear charging chip operates under the voltage difference across the terminals, the ratio of the charging current output to the battery to the battery's rated charging current is greater than or equal to a target ratio threshold. For example, the target ratio threshold can be 80%, 85%, or 90%, etc.

[0052] Since the charging current of a battery largely determines its charging duration, the controller dynamically adjusts the voltage difference across the linear charging chip during battery charging based on the target battery voltage and its corresponding relationship. Simultaneously, it needs to ensure that the ratio of the charging current output by the linear charging chip to the battery's rated charging current is not lower than the target threshold. This allows for the control of the linear charging chip's heat loss while maintaining a relatively high charging current, effectively balancing charging rate and charging efficiency.

[0053] For example, a specific voltage difference value is determined based on a preset correspondence. The system verifies whether this voltage difference value meets a performance condition: when the linear charging chip operates under this voltage difference, the actual charging current it outputs to the battery is compared with the battery's rated charging current, and the calculated ratio must be greater than or equal to a preset target ratio threshold. This threshold could be, for example, 80%, to ensure that the charging current is not less than 80% of the rated value, thereby maintaining a high charging speed while reducing power consumption.

[0054] Alternatively, during the constant current charging phase of the battery, the rate of increase in battery voltage decreases, and the voltage difference across the linear charging chip needs to decrease first and then increase.

[0055] Specifically, optionally, the controller can dynamically adjust the voltage difference across the linear charging chip during the constant current charging phase of the battery by first controlling the voltage difference across the linear charging chip to be at a relatively large value, and then controlling the voltage difference across the linear charging chip to decrease and then increase again, when the voltage difference across the linear charging chip is less than the voltage difference threshold.

[0056] During the constant current charging phase, the rate of increase in battery voltage gradually decreases. In other words, the slope of battery voltage increase gradually diminishes. Specifically, during the constant current charging phase, the battery may first experience a short period of rapid voltage increase, followed by a longer period of slow voltage increase, then a longer plateau period of continuously slowing voltage increase, and finally a period of near-constant voltage maintenance.

[0057] The controller can maintain a relatively large voltage difference across the linear charging chip during a short, rapid voltage increase period. Because this rapid increase period is short, maintaining a relatively high voltage difference allows the linear charging chip to output a higher charging current while ensuring low average heat loss, thus shortening charging time. Conversely, during a longer, slower voltage increase period, the controller can maintain a relatively small voltage difference across the linear charging chip to ensure low heat loss over a longer period, preventing overheating and maintaining high battery charging efficiency. Finally, during a longer, plateau period where battery voltage growth slows down, the controller can maintain a relatively lower voltage difference across the linear charging chip to reduce heat accumulation during this plateau period, further preventing overheating. Subsequently, during the period when the battery voltage is approximately fixed, the controller can control the voltage difference across the linear charging chip to increase to a relatively high value after the linear charging chip has undergone a relatively long heat dissipation period on the plateau. This ensures that the linear charging chip outputs a higher charging current while maintaining a low average heat loss, thereby shortening the charging time.

[0058] In one optional implementation, the correspondence between multiple battery voltage ranges and the voltage difference across the terminals during the constant current charging phase includes: The relationships between the first battery voltage range and the first voltage difference across its terminals are as follows: the second battery voltage range and the second voltage difference across its terminals; the third battery voltage range and the third voltage difference across its terminals; and the fourth battery voltage range and the fourth voltage difference across its terminals. Specifically, the first battery voltage range is the battery voltage range during the rapid growth phase; the second battery voltage range is the battery voltage range during the slow growth phase; the third battery voltage range is the battery voltage range during the plateau phase; and the fourth battery voltage range is the battery voltage range during the maintenance phase. Correspondingly, the voltage differences across the first, second, and third terminals decrease sequentially, and the voltage difference across the fourth terminal is greater than the voltage difference across the third terminal.

[0059] For example, when the battery is a lithium battery, the correspondence between multiple battery voltage ranges and the voltage difference across the terminals during the constant current charging phase includes: the voltage difference across the terminals corresponding to the battery voltage range [2.9, 3.6V) is [0.89, 0.91V]; the voltage difference across the terminals corresponding to the battery voltage range [3.6-3.9V) is [0.79, 0.81V]; the voltage difference across the terminals corresponding to the battery voltage range [3.9-4.0V) is [0.75, 0.77V]; and the voltage difference across the terminals corresponding to the battery voltage range [4.0-4.1V) is [0.79, 0.81V].

[0060] Through this correspondence, the controller enables the voltage difference across the linear charging chip to adaptively optimize in accordance with the real-time battery voltage. The voltage regulation strategy for the entire constant current charging stage can be finely divided into a segmented dynamic voltage regulation strategy, which enables graded regulation of the voltage difference across the linear charging chip. This ensures that the voltage difference across the linear charging chip is more matched to the battery's charging state while maintaining low heat loss, thus guaranteeing the overall charging rate, charging efficiency, and energy utilization of the battery charging system.

[0061] Optionally, the voltage control method further includes: determining the target input voltage of the linear charging chip as a preset voltage when the target battery voltage is lower than the constant current charging start voltage. The preset voltage is lower than the supply voltage.

[0062] In some embodiments, after acquiring the target battery voltage, the controller can compare the target battery voltage with a preset constant current charging start voltage. If the target battery voltage is less than the constant current charging start voltage, indicating that the battery is currently in the pre-charging stage, the controller can determine that the target input voltage of the linear charging chip is the preset voltage and control the voltage regulation module to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip.

[0063] Since the output voltage and charging current of the linear charging chip are not highly correlated during the pre-charging phase, a preset voltage lower than the differential voltage threshold can be directly set to control the target input voltage of the linear charging chip to this preset voltage. This effectively reduces the heat loss of the linear charging chip while maintaining the charging current.

[0064] Further optionally, the voltage control method further includes: determining the target input voltage of the linear charging chip as the supply voltage when the target battery voltage is greater than the constant current charging end voltage.

[0065] In some embodiments, after acquiring the target battery voltage, the controller can compare the target battery voltage with the preset constant current charging start voltage and constant current charging end voltage. If the target battery voltage is greater than the constant current charging end voltage, indicating that the battery is currently in the trickle charging stage, the controller can determine the target input voltage of the linear charging chip as the supply voltage and control the voltage regulation module to convert the supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip.

[0066] During the trickle charging phase, the battery is nearly fully charged, and its voltage is close to the rated voltage. This phase is relatively short, but the charging current decreases slowly. Therefore, the target input voltage of the linear charging chip can be directly controlled to match the supply voltage (i.e., the maximum voltage) provided by the external charging device. This ensures battery charging efficiency even with a reduced charging current. While controlling the target input voltage of the linear charging chip to match the supply voltage will increase the voltage difference across the chip and thus raise its temperature, the short duration of the trickle charging phase results in minimal user perception and almost no impact on the user experience.

[0067] It should be noted that the following examples further illustrate the implementation process and effects of the voltage control method provided in this application. Assume the battery is a lithium battery. The correspondence between multiple battery voltage ranges and the voltage difference across the terminals during the constant current charging phase includes: a voltage difference of 0.9V corresponding to the battery voltage range [2.9, 3.6V); a voltage difference of 0.8V corresponding to the battery voltage range [3.6-3.9V); a voltage difference of 0.75V corresponding to the battery voltage range [3.9-4.0V); and a voltage difference of 0.8V corresponding to the battery voltage range [4.0-4.1V]. Figure 3 As shown, the voltage control method includes: Step 301: Collect the target battery voltage.

[0068] Step 302: Compare the target battery voltage with the preset constant current charging start voltage (2.9V) and constant current charging end voltage (4.1V).

[0069] Step 303: When the target battery voltage is less than the constant current charging start voltage, determine the target input voltage of the linear charging chip as the preset voltage (3.5V).

[0070] Step 304: When the target battery voltage is greater than the constant current charging end voltage, determine the target input voltage of the linear charging chip as the supply voltage (5V).

[0071] Step 305: When the target battery voltage is between the constant current charging start voltage and the constant current charging end voltage, determine the target voltage difference between the two ends corresponding to the target battery voltage based on the correspondence between multiple battery voltage ranges and the voltage difference between the two ends during the constant current charging stage.

[0072] Specifically, if the target battery voltage is within the battery voltage range [2.9, 3.6V), the voltage difference across the target is determined to be 0.9V; if the target battery voltage is within the battery voltage range [3.6-3.9V), the voltage difference across the target is determined to be 0.8V; if the target battery voltage is within the battery voltage range [3.9-4.0V), the voltage difference across the target is determined to be 0.75V; and if the target battery voltage is within the battery voltage range [4.0-4.1V), the voltage difference across the target is determined to be 0.8V.

[0073] Step 306: The control voltage regulation module converts the power supply voltage provided by the external charging device into the target input voltage and outputs it to the linear charging chip.

[0074] Under this example voltage control method, the input voltage of the linear charging chip and the battery voltage (i.e., the output voltage) in the battery charging circuit exhibit the following characteristics: Figure 4 The changing trend shown corresponds to the voltage difference across the linear charging chip exhibiting the following characteristics: Figure 5 The trend of change is shown. Furthermore, to more clearly understand the reduction in heat loss of the linear charging chip under this voltage control method, embodiments of this application also provide... Figure 6 The diagram shows the change of battery voltage during the charging process in the related technologies and the battery voltage under the technical solution of this application; Figure 7 The diagram showing the change of charging current during the charging process in the related technologies and the charging current under the technical solution of this application is illustrated; and Figure 8 The diagram illustrates the temperature changes of the linear charging chip during the charging process in the related technologies shown and in the linear charging chip of this application. Figures 4 to 8 As can be seen, the changes in battery charging current and battery voltage are generally consistent under the technical solution of this application, but the chip temperature of the linear charging chip drops significantly, and the heat loss of the linear charging chip during battery charging is significantly reduced. The technical solution of this application can effectively improve the charging efficiency and energy utilization of the battery charging system.

[0075] In this embodiment, after acquiring the target battery voltage, the target voltage difference across the linear charging chip can be determined based on the correspondence between the voltage difference across the chip and the battery voltage. The sum of the target battery voltage and the target voltage difference is then calculated to obtain the target input voltage for the linear charging chip. This allows the voltage regulation module to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip. This enables dynamic adjustment of the output of the voltage regulation module before the linear charging chip, precisely controlling the input voltage of the linear charging chip. Furthermore, since the voltage difference across the chip is less than the voltage difference threshold, and at least some battery voltages correspond to different voltage differences, this technical solution allows the voltage difference across the linear charging chip to be adaptively optimized based on the real-time battery voltage, maintaining a relatively small value. This effectively reduces the operating temperature of the linear charging chip, decreases heat loss during battery charging, and improves the charging efficiency and energy utilization of the battery charging system.

[0076] This application also provides an atomizing device. The atomizing device includes a battery and any of the battery charging circuits provided in this application. In this application, after acquiring the target battery voltage, the target voltage difference across the linear charging chip can be determined according to the correspondence between the voltage difference across the linear charging chip and the battery voltage. The sum of the target battery voltage and the target voltage difference is then determined to obtain the target input voltage of the linear charging chip. The voltage regulation module is then controlled to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip. This achieves dynamic adjustment of the output of the voltage regulation module before the linear charging chip, precisely controlling the input voltage of the linear charging chip. Furthermore, since the voltage difference across the corresponding terminals is less than the voltage difference threshold, and at least some battery voltages correspond to different voltage differences across the terminals, the technical solution of this application allows the voltage difference across the linear charging chip to be adaptively optimized according to the real-time battery voltage, maintaining it at a relatively small value. This effectively reduces the operating temperature of the linear charging chip, reduces heat loss during battery charging, and improves the charging efficiency and energy utilization of the battery charging system.

[0077] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A voltage control method, characterized in that, A battery charging circuit for an atomizing device includes a controller, a voltage regulation module, and a linear charging chip. The voltage regulation module is connected to an external charging device and to the battery via the linear charging chip. The controller is connected to both the voltage regulation module and the battery. The method includes: Collect the target battery voltage of the battery; Based on the correspondence between the voltage difference across the linear charging chip and the battery voltage, the target voltage difference across the target battery voltage is determined, and the sum of the target battery voltage and the target voltage difference across the target is determined to obtain the target input voltage of the linear charging chip. The voltage regulation module controls the external charging device to convert the power supply voltage provided by the external charging device into the target input voltage and output it to the linear charging chip. In this case, the voltage difference between the two ends in the correspondence is less than the voltage difference threshold, and at least some of the battery voltages correspond to different voltage differences between the two ends.

2. The voltage control method according to claim 1, characterized in that, The step of determining the target voltage difference across the target battery voltage based on the relationship between the voltage difference across the linear charging chip and the battery voltage includes: Based on the correspondence between multiple battery voltage ranges and the voltage difference across the terminals, the target voltage difference across the terminals corresponding to the battery voltage range to which the target battery voltage belongs is determined, wherein the voltage difference across the terminals corresponding to each battery voltage range is different.

3. The voltage control method according to claim 2, characterized in that, The step of determining the target voltage difference across the battery voltage range corresponding to the target battery voltage based on the correspondence between multiple battery voltage ranges and the voltage difference across the terminals includes: When the target battery voltage is greater than or equal to the constant current charging start voltage, the target voltage difference across the terminals corresponding to the target battery voltage is determined based on the correspondence between the multiple battery voltage ranges during the constant current charging phase and the voltage difference across the terminals.

4. The voltage control method according to claim 3, characterized in that, During the constant current charging phase of the battery, the rate of increase in battery voltage decreases, and the voltage difference between the two ends first decreases and then increases.

5. The voltage control method according to any one of claims 3 to 4, characterized in that, The voltage difference between the two ends in the corresponding relationship satisfies the following condition: when the linear charging chip operates under the voltage difference between the two ends, the ratio of the charging current output by the linear charging chip to the battery to the rated charging current of the battery is greater than or equal to the target ratio threshold.

6. The voltage control method according to any one of claims 3 to 4, characterized in that, The method further includes: If the target battery voltage is less than the constant current charging start voltage, the target input voltage of the linear charging chip is determined to be a preset voltage, which is less than the supply voltage.

7. The voltage control method according to any one of claims 3 to 4, characterized in that, The method further includes: If the target battery voltage is greater than the constant current charging end voltage, the target input voltage of the linear charging chip is determined to be the supply voltage.

8. The voltage control method according to claim 1, characterized in that, The voltage regulation module is used to adjust the supply voltage according to the duty cycle of the control signal to obtain the input voltage of the linear charging chip; the control signal includes an initial control signal and a target control signal; The control module for converting the power supply voltage provided by the external charging device into the target input voltage and then outputting it to the linear charging chip includes: The duty cycle of the initial control signal is adjusted based on the target input voltage to obtain the target control signal; The target control signal is output to the voltage regulation module so that the voltage regulation module adjusts the supply voltage according to the duty cycle of the target control signal to obtain the target input voltage and then outputs it to the linear charging chip.

9. A battery charging circuit, characterized in that, Applied to atomizing devices, the battery charging circuit includes: a voltage regulation module, a linear charging chip, and a controller; The voltage regulation module is used to connect to an external charging device and to the battery through the linear charging chip. The voltage regulation module is used to convert the power supply voltage provided by the external charging device to obtain the input voltage of the linear charging chip and output the input voltage to the linear charging chip. The linear charging chip is used to adjust the charging voltage of the battery based on the input voltage and output the charging voltage to the battery; The controller is connected to the voltage regulation module and the battery respectively, and is used to execute the voltage control method according to any one of claims 1 to 8.

10. An atomizing device, characterized in that, The atomizing device includes: a battery, and the battery charging circuit as described in claim 9.

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