Electric hair cutter charging method and device and charging box

Abstract

The invention relates to the field of charging, in particular to an electric hair cutter charging method and device and a charging box. According to the method, harmonic disturbance of the voltage of a power grid is monitored; according to the application, the disturbance of the charging voltage of the charging box can be determined by monitoring the harmonic disturbance of the power grid, and then the electric clippers are dynamically selected to form the target electric clipper combination according to the disturbance of the charging voltage, so that the comprehensive battery impedance of the charging loop is matched with the changing charging voltage; therefore, the charging current of each electric hair cutter battery is kept stable in the whole charging process, the health of the battery is ensured, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of charging, and in particular to a method, apparatus, and charging box for charging electric hair clippers. Background Technology

[0002] The electric clipper charging case is a dedicated device that provides charging, storage, and protection for rechargeable electric clippers (hair clippers). It combines power management and portable storage functions and is one of the standard accessories for modern electric clippers.

[0003] Existing electric clipper charging boxes often have multiple charging ports, allowing simultaneous charging of multiple clippers. However, when charging multiple clippers simultaneously, the use of other electrical appliances (such as hair dryers or curling irons) can cause disturbances to the power grid. This results in dynamic harmonic disturbances in the charging voltage of the charging box, which is powered by the power grid. Current technologies often use hardware filtering to address this, but the filter parameters are usually fixed at the factory and are difficult to adapt to various forms of disturbances generated by the power grid. Consequently, the charging voltage for each clipper still changes frequently, leading to frequent changes in the charging current, which affects battery health and causes premature battery aging. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, device, and charging box for charging electric hair clippers to address the above-mentioned problems.

[0005] This invention is implemented as follows: a method for charging electric hair clippers, applied to a charging box, the method comprising: S1: Before starting charging, monitor the harmonic disturbance cycle of the power grid; S2: Determine the harmonic disturbance amplitude of each period segment in the disturbance period; S3: After charging begins, monitor the real-time battery impedance of each electric clipper battery; S4: Before each cycle segment, based on the harmonic disturbance amplitude of that cycle segment and the real-time battery impedance of each electric clipper battery, determine the target electric clipper combination consisting of at least one electric clipper from each electric clipper, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, so as to eliminate the influence of harmonic disturbance in that cycle segment. S5: After entering the cycle segment, connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to the charging circuit, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

[0006] In one embodiment, the present invention provides a power clipper charging device, wherein a module of the power clipper charging device is used to perform the power clipper charging method, specifically including: The first monitoring module is used to monitor the harmonic disturbance period of the power grid before charging begins. The first processing module is used to determine the harmonic disturbance amplitude of each period segment in the disturbance period; The second monitoring module is used to monitor the real-time battery impedance of each electric clipper battery after charging begins. The second processing module is used to determine a target electric clipper combination consisting of at least one electric clipper from each electric clipper before each cycle segment, based on the harmonic disturbance amplitude of the cycle segment and the real-time battery impedance of each electric clipper battery, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, thereby eliminating the influence of harmonic disturbance in the cycle segment. The third processing module is used to connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to charging after entering the cycle segment, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

[0007] In one embodiment, the present invention provides a charging box, the charging box including at least one memory, at least one processor, and a computer program stored in the at least one memory and executable on the at least one processor, wherein when the processor executes the computer program, the charging box performs the steps in the embodiment of the electric hair clipper charging method.

[0008] This invention provides a method, apparatus, and charging box for electric hair clippers. The method includes: monitoring the harmonic disturbance cycle of the power grid before starting charging; determining the harmonic disturbance amplitude of each cycle segment within the disturbance cycle; monitoring the real-time battery impedance of each electric hair clipper battery after starting charging; before reaching each cycle segment, determining a target electric hair clipper combination consisting of at least one electric hair clipper from among the electric hair clippers based on the harmonic disturbance amplitude of that cycle segment and the real-time battery impedance of each electric hair clipper battery, so that the overall battery impedance of the target electric hair clipper combination matches the charging voltage under harmonic disturbance to eliminate the influence of harmonic disturbance in that cycle segment; and after entering that cycle segment, [the method further includes] [the method of ... Each electric clipper in the electric clipper combination corresponding to the periodic segment is connected to the charger, and the above steps are repeated until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process. In this application, the monitored harmonic disturbance of the power grid is the monitored harmonic disturbance of the power grid voltage. This application can determine the disturbance of the charging voltage of the charging box by monitoring the harmonic disturbance of the power grid, and then dynamically select electric clippers to form a target electric clipper combination based on the disturbance of the charging voltage, so that the overall battery impedance of the charging circuit matches the changing charging voltage, thereby keeping the charging current of each electric clipper battery stable throughout the charging process, so as to ensure the health of the battery and extend its service life. Attached Figure Description

[0009] Figure 1 A flowchart of a method for charging an electric hair clipper provided in one embodiment; Figure 2 A diagram illustrating the application environment of the electric clipper charging method provided in one embodiment; Figure 3 A flowchart of a charging method for an electric hair clipper provided in one embodiment; Figure 4 This is a block diagram of the internal structure of the charging box in one embodiment. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0011] It is understood that the terms "first," "second," etc., used in this invention may be used to describe various elements herein, but unless specifically stated otherwise, these elements are not limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this invention, a first script may be referred to as a second script, and similarly, a second script may be referred to as a first script.

[0012] like Figure 1 As shown, in one embodiment, a method for charging electric hair clippers is proposed, applied to a charging box, the method comprising: S1: Before starting charging, monitor the harmonic disturbance cycle of the power grid; S2: Determine the harmonic disturbance amplitude of each period segment in the disturbance period; S3: After charging begins, monitor the real-time battery impedance of each electric clipper battery; S4: Before each cycle segment, based on the harmonic disturbance amplitude of that cycle segment and the real-time battery impedance of each electric clipper battery, determine the target electric clipper combination consisting of at least one electric clipper from each electric clipper, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, so as to eliminate the influence of harmonic disturbance in that cycle segment. S5: After entering the cycle segment, connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to the charging circuit, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

[0013] In this embodiment, as Figure 2As shown, this method is performed in a charging box, which has multiple charging slots (e.g., 5). Each charging slot has a charging interface. The user can place the electric clipper into the charging slot to connect the battery of the electric clipper to the charging interface, thereby charging the battery of the electric clipper. In this embodiment, the application scenario for the electric clipper charging box is often a barbershop. In barbershops, in addition to electric clippers, there is often the use of high-power electrical appliances such as hair dryers and curling irons, which can easily cause a backlash to the power grid of the barbershop and generate harmonic disturbances. Since the use of other electrical appliances often lasts for a certain period of time, the impact on the power grid will also last for a certain period of time. Therefore, within this period of time, the harmonic disturbance of the power grid shows a regular change according to a certain period. The harmonic disturbance period monitored by S1 of this method is the current disturbance period of the power grid. The analysis is based on this disturbance period to determine the charging strategy and to charge. However, since other electrical appliances in use may change, the disturbance period may also change. Therefore, during the charging process, the charging box monitors in real time whether the disturbance period of the power grid has changed. If so, the charging box re-monitors the new disturbance period and uses the new disturbance period as the basis for analysis to determine the charging strategy and to charge.

[0014] In this embodiment, the harmonic disturbance cycle is divided into several cycle segments (equivalent to sub-intervals). After charging begins, the charging box first identifies which cycle segment of the disturbance cycle it is about to enter. Then, it determines the target electric clipper combination based on the harmonic disturbance amplitude of that cycle segment and charges the electric clippers in the combination. Before the next cycle segment, it re-determines the target electric clipper combination based on the harmonic disturbance amplitude of the next cycle segment and switches to the new combination of electric clippers for charging. This process is repeated. When a disturbance cycle ends, the selection and charging of the target electric clipper combination automatically starts from the first cycle segment of the next disturbance cycle. This process is repeated until charging is complete.

[0015] In this embodiment, the method for monitoring the real-time battery impedance of each electric clipper battery includes: applying a fixed-frequency AC signal to the battery in real time and monitoring the response voltage of the same frequency generated by the AC signal excitation. and response current Calculate the AC resistance at that moment. This refers to the real-time battery impedance.

[0016] In this application, the monitored harmonic disturbances of the power grid refer to the harmonic disturbances of the power grid voltage. This application can determine the disturbance of the charging voltage of the charging box by monitoring the harmonic disturbances of the power grid, and then dynamically select electric clippers to form a target electric clipper combination based on the disturbance of the charging voltage, so that the overall battery impedance of the charging circuit matches the changing charging voltage, thereby keeping the charging current of each electric clipper battery stable throughout the charging process, so as to ensure the health of the battery and extend its service life.

[0017] As a preferred embodiment, the harmonic disturbance cycle of the power grid is monitored, that is, the actual charging voltage curve of the charging box caused by a complete harmonic disturbance cycle of the power grid is monitored; the determination of the harmonic disturbance amplitude of each period segment in the disturbance cycle includes: S21: Retrieve the actual curve of the monitored charging voltage and determine the phase span of the curve; S22: Retrieve the standard charging voltage curve for this phase span; S23: Align the actual charging voltage curve with the standard charging voltage curve, calculate the voltage difference between the two curves at each phase, and determine the obtained voltage difference change curve as the disturbance curve, wherein the disturbance curve characterizes the change of disturbance amplitude throughout the entire harmonic disturbance cycle. S24: Based on the degree of change of each part of the disturbance curve, the phase span corresponding to the disturbance curve is divided into several periodic segments, thereby obtaining the harmonic disturbance amplitude of each periodic segment.

[0018] In this embodiment, monitoring the harmonic disturbance period of the power grid is a continuous process. The actual obtained curve includes curves corresponding to multiple complete harmonic disturbance periods. The actual charging voltage curve corresponding to one complete harmonic disturbance period can be selected from these curves. In this embodiment, the horizontal axis of the charging voltage standard curve and the actual charging voltage curve are: the charging voltage standard curve is the charging voltage change curve under the condition that there is no harmonic disturbance in the power grid. This curve is an ideal curve and is preset in the charging box; the phase span of the charging voltage standard curve is the same as that of the actual charging voltage curve, so that each curve point of the two curves can correspond one-to-one. In this embodiment, after calculating the voltage difference between the two curves at any phase, a coordinate point is obtained with the phase as the abscissa and the voltage difference as the ordinate. Connecting all the obtained coordinate points with a smooth curve yields the disturbance curve. The disturbance curve represents the change in disturbance amplitude throughout the entire harmonic disturbance cycle. After dividing the disturbance curve into several periodic segments, the local disturbance curve of each periodic segment represents the harmonic disturbance amplitude of that periodic segment.

[0019] As a preferred embodiment, the phase span corresponding to the disturbance curve is divided into several periodic segments based on the degree of change in each part of the disturbance curve, including: S241: Take the starting point of the disturbance curve as the first point, and generate the second point at the first point; S242: Move the second point in the positive direction by a set step size on the disturbance curve; S243: Calculate the standard deviation of the disturbance curve segment between the first point and the second point, and determine whether the standard deviation is higher than the preset value; S244: If yes, then execute steps S242 to S244 again until the standard deviation is lower than the preset value, stop moving the second point, and determine the phase corresponding to the first point to the phase corresponding to the second point as a periodic segment. S245: Move the first point to a position that coincides with the second point, and execute steps S242 to S244 to obtain the next periodic segment. Repeat this step to obtain all periodic segments. The endpoint phase of the last periodic segment is the phase corresponding to the endpoint of the disturbance curve.

[0020] In this embodiment, the positive direction is the direction of curve extension when acquiring the curve; the step size can be set to the length on the disturbance curve corresponding to the set phase span (e.g., 5°); the preset value corresponding to the standard deviation can be 0.2 or other values, which are not limited here; the second point and the first point are two different points, except that the position of the second point when it is generated coincides with the first point; if the second point directly reaches the end point of the disturbance curve during the movement, the movement can be stopped, and the phase corresponding to the second point is taken as the end point of the last period segment; through the method of this embodiment, the disturbance amplitude of each divided period segment can be made to be approximately the same, so the influence of the disturbance of the period segment can be eliminated by the comprehensive battery impedance of the same set of target electric clipper groups.

[0021] As a preferred embodiment, determining a target electric clipper combination consisting of at least one electric clipper from among the electric clippers, based on the harmonic disturbance amplitude of the periodic segment and the real-time battery impedance of each electric clipper battery, includes: The local curve segment of the actual charging voltage curve corresponding to this period segment is taken as the target curve segment; Select the preset standard charging current range; The target impedance range of the overall battery impedance is determined based on the voltage variation range of the target curve segment and the standard charging current range. Based on the real-time battery impedance of each electric clipper battery, a target electric clipper combination consisting of at least one electric clipper is determined, so that the overall battery impedance of the target electric clipper combination falls within the target impedance range.

[0022] The target impedance range for the overall battery impedance is determined based on the voltage variation range of the target curve segment and the standard charging current range, including: Determine the maximum and minimum voltages within the voltage variation range; Determine the maximum and minimum currents within the standard charging current range; The maximum impedance is obtained by dividing the determined maximum voltage by the minimum current. Divide the determined minimum voltage by the minimum current to obtain the minimum impedance, and then obtain the target impedance range from the minimum impedance to the maximum impedance.

[0023] In this embodiment, the standard charging current range is a pre-set charging current range (e.g., 0.5A~1A) that can minimize the impact on battery life. This range can be determined through pre-experimental testing. Furthermore, given the voltage variation range of the target curve segment and the standard charging current range, the target impedance range can be calculated based on Ohm's law.

[0024] As a preferred embodiment, determining the target electric clipper combination consisting of at least one electric clipper based on the real-time battery impedance of each electric clipper battery includes: Identify all possible combinations; For each alternative combination, the corresponding comprehensive battery impedance is calculated based on the real-time battery impedance of each electric shear battery in the combination. Select the candidate combinations whose overall battery impedance falls within the target impedance range. The target electric clipper combination is determined from the candidate combinations selected based on the charging progress of the batteries in each selected candidate combination.

[0025] In this embodiment, all candidate combinations are determined, that is, all possible combinations of electric hair clippers are determined. For example, if the total number of electric hair clippers charging is 5, all candidate combinations include... , , , , ; In this embodiment, since the real-time battery impedance of each electric clipper has been detected, and the electric clippers are connected in parallel in the charging circuit, the overall battery impedance can be calculated using the following formula: in, To take into account the battery impedance, Let be the real-time battery impedance of the i-th electric clipper.

[0026] As a preferred embodiment, the target electric hair clipper combination is determined from the candidate combinations selected based on the charging progress of the batteries in each selected candidate combination, including: For each electric clipper in the charging box, the charging progress of the corresponding electric clipper battery is determined based on the duration of the electric clipper being placed in the charging box and the cumulative charging amount. For each selected candidate combination, determine the overall charging progress of each electric clipper battery in the charging box after the electric clipper of the candidate combination is charged in the next cycle segment. The candidate combination with the highest overall charging progress is selected as the target electric clipper combination.

[0027] The charging progress of the electric hair clipper battery is determined based on the duration of time the clipper is placed in the charging box and the cumulative charging amount, including: Determine the current power level of the electric clipper, and then determine the progress reduction factor corresponding to the current power level. The higher the current power level, the smaller the progress reduction factor. Determine the estimated charge amount for the electric hair clipper to be continuously charged while it is in the charging box for the duration of its placement. The charging progress is calculated using the following formula: in, For charging progress, This is the schedule reduction factor. For cumulative charging amount, To estimate the amount of charge; After determining the charging schedule for the alternative combination of electric hair clippers in the next cycle segment, the overall charging progress of each electric hair clipper battery in the charging box includes: Calculate the charging progress of each electric shear in the alternative combination at the end of the next cycle segment; Calculate the average of each charging progress to obtain the overall charging progress.

[0028] In this embodiment, because the charging method switches the target electric clipper group, the charging process of some electric clippers may be intermittent, affecting their charging progress. In this embodiment, the charging progress represents the proportion of the current actual charging amount of the electric clipper to the charging amount under uninterrupted charging. The comprehensive charging progress can represent the overall charging progress of all electric clippers. The higher the comprehensive charging progress, the faster the overall charging progress of each electric clipper. In this embodiment, selecting the candidate combination with the comprehensive charging progress as the target electric clipper combination can minimize the impact of intermittent charging on the charging progress of each electric clipper. In this embodiment, the battery level is 0-100%, and the reduction factor is 0.5-0.6. The progress reduction factor corresponding to each battery level can be determined by mean interpolation; for example, the progress reduction factor corresponding to 60% battery level is 0.6 - (0.6 - 0.5). 60% = 0.54; By introducing a progress reduction factor, the progress of electric clippers with lower battery levels can be amplified, so that charging is directed as much as possible towards electric clippers with lower battery levels.

[0029] In this embodiment, since the phase span of the periodic segment is known, i.e., the charging time is known, and the charging amount per unit time for the electric clipper (calculated based on historical data) is also known, the charging progress of each electric clipper battery after charging the electric clipper of the candidate combination in the next periodic segment can be estimated, and then the overall charging progress of each electric clipper battery can be calculated. Furthermore, since the charging amount per unit time for the electric clipper is known, the time for the electric clipper to be placed in the charging box is the time between the current moment and the moment the electric clipper is placed in the charging box. Multiplying this time by the charging amount per unit time for the electric clipper can yield the estimated charging amount.

[0030] like Figure 1 As shown, in one embodiment, an electric clipper charging device is proposed. The module of the electric clipper charging device is used to execute the electric clipper charging method, specifically including: The first monitoring module is used to monitor the harmonic disturbance period of the power grid before charging begins. The first processing module is used to determine the harmonic disturbance amplitude of each period segment in the disturbance period; The second monitoring module is used to monitor the real-time battery impedance of each electric clipper battery after charging begins. The second processing module is used to determine a target electric clipper combination consisting of at least one electric clipper from each electric clipper before each cycle segment, based on the harmonic disturbance amplitude of the cycle segment and the real-time battery impedance of each electric clipper battery, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, thereby eliminating the influence of harmonic disturbance in the cycle segment. The third processing module is used to connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to charging after entering the cycle segment, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

[0031] The process by which each module in the electric hair clipper charging device provided in this application implements its respective function can be specifically referred to the foregoing. Figure 1 The description of the illustrated embodiment will not be repeated here.

[0032] like Figure 1 As shown, in one embodiment, a charging box is proposed, the charging box including at least one memory, at least one processor, and a computer program stored in the at least one memory and executable on the at least one processor, wherein when the processor executes the computer program, the charging box implements the steps in the embodiment of the electric hair clipper charging method.

[0033] In this embodiment, the charging box can monitor the harmonic disturbances of the power grid, namely the harmonic disturbances of the power grid voltage. This application can determine the disturbance of the charging voltage of the charging box by monitoring the harmonic disturbances of the power grid, and then dynamically select electric clippers to form a target electric clipper combination based on the disturbance of the charging voltage, so that the overall battery impedance of the charging circuit matches the changing charging voltage, thereby keeping the charging current of each electric clipper battery stable throughout the charging process, so as to ensure the health of the battery and extend its service life.

[0034] Figure 4 An internal structural diagram of the charging case in one embodiment is shown. Figure 4 As shown, the charging box includes a processor, a memory, a network interface, an input device, and a display screen connected via a system bus. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and may also store a computer program. When executed by the processor, this computer program enables the processor to implement the electric clipper charging method provided in this embodiment of the invention. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to execute the electric clipper charging method provided in this embodiment of the invention. The display screen of the charging box can be a liquid crystal display screen or an e-ink display screen. The input device of the charging box can be a touch layer covering the display screen, or buttons, a trackball, or a touchpad provided on the outer shell of the charging box, or an external keyboard, touchpad, or mouse, etc.

[0035] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the charging box to which the present invention is applied. A specific charging box may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0036] In one embodiment, the electric hair clipper charging device provided by this invention can be implemented as a computer program, and the computer program can be implemented as follows: Figure 4 The charging box shown operates on this device. The charging box's memory can store the various program modules that make up the electric hair clipper charging device, for example, Figure 3 The diagram shows a first monitoring module, a first processing module, a second monitoring module, a second processing module, and a third processing module. The computer program comprised of these modules causes the processor to execute the steps in the electric clipper charging method of the various embodiments of the present invention described in this specification.

[0037] For example, Figure 4 The charging case shown can be used as follows Figure 3The first monitoring module in the electric clipper charging device shown executes step S1; the charging box can execute step S2 through the first processing module; the charging box can execute step S3 through the second monitoring module; the charging box can execute step S4 through the second processing module; and the charging box can execute step S5 through the third processing module.

[0038] In one embodiment, a charging case is provided, the charging case including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps: S1: Before starting charging, monitor the harmonic disturbance cycle of the power grid; S2: Determine the harmonic disturbance amplitude of each period segment in the disturbance period; S3: After charging begins, monitor the real-time battery impedance of each electric clipper battery; S4: Before each cycle segment, based on the harmonic disturbance amplitude of that cycle segment and the real-time battery impedance of each electric clipper battery, determine the target electric clipper combination consisting of at least one electric clipper from each electric clipper, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, so as to eliminate the influence of harmonic disturbance in that cycle segment. S5: After entering the cycle segment, connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to the charging circuit, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

[0039] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, causes the processor to perform the following steps: S1: Before starting charging, monitor the harmonic disturbance cycle of the power grid; S2: Determine the harmonic disturbance amplitude of each period segment in the disturbance period; S3: After charging begins, monitor the real-time battery impedance of each electric clipper battery; S4: Before each cycle segment, based on the harmonic disturbance amplitude of that cycle segment and the real-time battery impedance of each electric clipper battery, determine the target electric clipper combination consisting of at least one electric clipper from each electric clipper, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, so as to eliminate the influence of harmonic disturbance in that cycle segment. S5: After entering the cycle segment, connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to the charging circuit, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

[0040] It should be understood that although the steps in the flowcharts of the various embodiments of the present invention are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the various embodiments may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps. Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for charging electric hair clippers, applied to a charging box, characterized in that, The method includes: S1: Before starting charging, monitor the harmonic disturbance cycle of the power grid; S2: Determine the harmonic disturbance amplitude of each period segment in the disturbance period; S3: After charging begins, monitor the real-time battery impedance of each electric clipper battery; S4: Before each cycle segment, based on the harmonic disturbance amplitude of that cycle segment and the real-time battery impedance of each electric clipper battery, determine the target electric clipper combination consisting of at least one electric clipper from each electric clipper, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, so as to eliminate the influence of harmonic disturbance in that cycle segment. S5: After entering the cycle segment, connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to the charging circuit, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

2. The method according to claim 1, characterized in that, The monitoring of the harmonic disturbance cycle of the power grid, specifically the actual charging voltage curve of the charging box caused by a complete harmonic disturbance cycle of the power grid; determining the harmonic disturbance amplitude of each cycle segment within the disturbance cycle includes: S21: Retrieve the actual curve of the monitored charging voltage and determine the phase span of the curve; S22: Retrieve the standard charging voltage curve for this phase span; S23: Align the actual charging voltage curve with the standard charging voltage curve, calculate the voltage difference between the two curves at each phase, and determine the obtained voltage difference change curve as the disturbance curve, wherein the disturbance curve characterizes the change of disturbance amplitude throughout the entire harmonic disturbance cycle. S24: Based on the degree of change of each part of the disturbance curve, the phase span corresponding to the disturbance curve is divided into several periodic segments, thereby obtaining the harmonic disturbance amplitude of each periodic segment.

3. The method according to claim 2, characterized in that, Based on the degree of change in each part of the disturbance curve, the phase span corresponding to the disturbance curve is divided into several periodic segments, including: S241: Take the starting point of the disturbance curve as the first point, and generate the second point at the first point; S242: Move the second point in the positive direction by a set step size on the disturbance curve; S243: Calculate the standard deviation of the disturbance curve segment between the first point and the second point, and determine whether the standard deviation is higher than the preset value; S244: If yes, then execute steps S242 to S244 again until the standard deviation is lower than the preset value, stop moving the second point, and determine the phase corresponding to the first point to the phase corresponding to the second point as a periodic segment. S245: Move the first point to a position that coincides with the second point, and execute steps S242 to S244 to obtain the next periodic segment. Repeat this step to obtain all periodic segments. The endpoint phase of the last periodic segment is the phase corresponding to the endpoint of the disturbance curve.

4. The method according to claim 3, characterized in that, Based on the harmonic disturbance amplitude of the periodic segment and the real-time battery impedance of each electric clipper battery, a target electric clipper combination consisting of at least one electric clipper is determined from each electric clipper, including: The local curve segment of the actual charging voltage curve corresponding to this period segment is taken as the target curve segment; Select the preset standard charging current range; The target impedance range of the overall battery impedance is determined based on the voltage variation range of the target curve segment and the standard charging current range. Based on the real-time battery impedance of each electric clipper battery, a target electric clipper combination consisting of at least one electric clipper is determined, so that the overall battery impedance of the target electric clipper combination falls within the target impedance range.

5. The method according to claim 4, characterized in that, The target impedance range for the overall battery impedance is determined based on the voltage variation range of the target curve segment and the standard charging current range, including: Determine the maximum and minimum voltages within the voltage variation range; Determine the maximum and minimum currents within the standard charging current range; The maximum impedance is obtained by dividing the determined maximum voltage by the minimum current. Divide the determined minimum voltage by the minimum current to obtain the minimum impedance, and then obtain the target impedance range from the minimum impedance to the maximum impedance.

6. The method according to claim 4, characterized in that, Based on the real-time battery impedance of each electric clipper battery, the target electric clipper combination consisting of at least one electric clipper is determined as follows: Identify all possible combinations; For each alternative combination, the corresponding comprehensive battery impedance is calculated based on the real-time battery impedance of each electric shear battery in the combination. Select the candidate combinations whose overall battery impedance falls within the target impedance range. The target electric clipper combination is determined from the candidate combinations selected based on the charging progress of the batteries in each selected candidate combination.

7. The method according to claim 6, characterized in that, Based on the charging progress of the batteries in each of the selected candidate combinations, the target electric hair clipper combination was determined to include: For each electric clipper in the charging box, the charging progress of the corresponding electric clipper battery is determined based on the duration of the electric clipper being placed in the charging box and the cumulative charging amount. For each selected candidate combination, determine the overall charging progress of each electric clipper battery in the charging box after the electric clipper of the candidate combination is charged in the next cycle segment. The candidate combination with the highest overall charging progress is selected as the target electric clipper combination.

8. The method according to claim 7, characterized in that, The charging progress of the electric hair clipper battery is determined based on the duration of time the clipper is placed in the charging box and the cumulative charging amount, including: Determine the current power level of the electric clipper, and then determine the progress reduction factor corresponding to the current power level. The higher the current power level, the smaller the progress reduction factor. Determine the estimated charge amount for the electric hair clipper to be continuously charged while it is in the charging box for the duration of its placement. The charging progress is calculated using the following formula: in, For charging progress, This is the schedule reduction factor. For cumulative charging amount, To estimate the amount of charge; After determining the charging schedule for the alternative combination of electric hair clippers in the next cycle segment, the overall charging progress of each electric hair clipper battery in the charging box includes: Calculate the charging progress of each electric shear in the alternative combination at the end of the next cycle segment; Calculate the average of each charging progress to obtain the overall charging progress.

9. A charging device for electric hair clippers, characterized in that, The module of the electric clipper charging device is used to execute the electric clipper charging method as described in claim 1, specifically including: The first monitoring module is used to monitor the harmonic disturbance period of the power grid before charging begins. The first processing module is used to determine the harmonic disturbance amplitude of each period segment in the disturbance period; The second monitoring module is used to monitor the real-time battery impedance of each electric clipper battery after charging begins. The second processing module is used to determine a target electric clipper combination consisting of at least one electric clipper from each electric clipper before each cycle segment, based on the harmonic disturbance amplitude of the cycle segment and the real-time battery impedance of each electric clipper battery, so that the comprehensive battery impedance of the target electric clipper combination matches the charging voltage under harmonic disturbance, thereby eliminating the influence of harmonic disturbance in the cycle segment. The third processing module is used to connect each electric clipper of the electric clipper assembly corresponding to the cycle segment to charging after entering the cycle segment, and repeat steps S3 to S5 until charging is completed, thereby keeping the charging current stable within the set range throughout the charging process.

10. A charging case, characterized in that, The charging box includes at least one memory, at least one processor, and a computer program stored in the at least one memory and executable on the at least one processor. When the processor executes the computer program, it causes the charging box to perform the steps in the embodiments of the electric clipper charging method as described in any one of claims 1-8.

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