A control method for a skin cleaning device and a skin cleaning device

Abstract

The present invention discloses a control method for a skin cleaning device and a skin cleaning device, wherein the control method comprises: obtaining the working current of a rotating motor of the skin cleaning device in real time; when it is detected that the working current reaches or exceeds the stall current, sending a control signal to the power switch circuit to control the power supply voltage of the rotating motor to be cut off, and accumulating the number of times the power supply voltage is cut off; when the number of times the power supply voltage is cut off does not reach a preset number of times, and the cut-off time of the rotating motor power supply reaches a first preset time, controlling the power supply voltage of the rotating motor to be connected. The present invention can automatically cut off the power supply when the rotating motor of the skin cleaning device is stalled to protect the rotating motor, and can also automatically resume rotation when the stall is released, thereby improving the user experience.

Description

Technical Field

[0001] The invention relates to the technical field of personal appliance care, in particular to a control method of a skin cleaning device and a skin cleaning device. Background Art

[0002] With the improvement of people's living standards, people pay more and more attention to skin cleansing. Traditional bath balls, bath towels, face towels, etc. can no longer meet people's needs for cleaning quality and comfort, so various electric cleaning products have appeared on the market. Rotary electric cleaning products have good cleaning effects and user experience and are favored by users, but if the user uses them closely during use, the rotating brush head will be blocked. In order to prevent the motor from burning out, the products on the market basically choose to stop the rotating motor directly to avoid the rotating motor from being blocked, but after stopping, the user needs to press the start button again for the cleaning product to continue running. However, when users use facial cleansers to clean their faces, they often cannot open their eyes, and manual start-up will cause trouble to users to a certain extent. In addition, users cannot know how long it will take to start again. Waiting too long before starting will waste the user's time. Waiting too short to start will cause the motor to overheat and affect the user experience. Summary of the invention

[0003] The main purpose of the present invention is to propose a control method for a skin cleaning device and a skin cleaning device, which overcome the shortcomings of the skin cleaning devices in the prior art and can automatically cut off power when the rotating motor of the skin cleaning device is blocked to protect the rotating motor. It can also automatically resume rotation when the blockage is released, thereby improving the user experience.

[0004] The present invention adopts the following technical solution:

[0005] In one aspect, a method for controlling a skin cleaning device comprises:

[0006] Acquire the working current of the rotating motor of the skin cleaning device in real time;

[0007] When it is detected that the working current reaches or exceeds the stall current, a control signal is sent to the power switch circuit to control cutting off the power supply voltage of the rotating motor, and the number of times the power supply voltage is cut off is accumulated;

[0008] When the number of times the power supply voltage is cut off does not reach the preset number and the cut-off time of the power supply of the rotating electrical machine reaches the first preset time, the power supply voltage of the rotating electrical machine is controlled to be turned on.

[0009] Preferably, the first preset time is the time for compensating the output power exceeding the rated power during the period from when the working current exceeds the rated current to when the power supply is cut off.

[0010] Preferably, the method for obtaining the first preset time is as follows:

[0011] Obtain the total output power of the rotating motor from the time when the working current of the rotating motor exceeds the rated current to the time when the power supply is cut off;

[0012] Obtain the equivalent total rated power of the rotating motor from the time when the working current of the rotating motor exceeds the rated current to the time when the power supply is cut off;

[0013] The first preset time is obtained by subtracting the total output power from the total rated power and dividing the result by the rated power per unit time.

[0014] Preferably, the total output power of the rotating electrical machine is expressed as follows:

[0015] W total =T S *(P1+P2+......+P n )

[0016] Among them, W total Indicates the total output power; T S Indicates the sampling period; P1, P2, ..., P n They represent the output power of the rotating motor in a single sampling period, which is equal to the product of the operating current of the rotating motor and the power supply voltage;

[0017] The equivalent total rated power of the rotating electrical machine is expressed as follows:

[0018] W r =n*T S *P r

[0019] Among them, W r represents the total rated power, n represents the number of sampling times from the time when the working current exceeds the rated current to the time when the power is cut off; P r It represents the rated power of a single sampling period, which is equal to the product of the rated current of the rotating motor and the power supply voltage;

[0020] The first preset time is expressed as follows:

[0021] T a =(W total -W r ) / P r

[0022] Among them, T a Indicates the first preset time.

[0023] Preferably, before sending a control signal to the power switch circuit to control cutting off the power supply voltage of the rotating motor, the method further comprises:

[0024] It is determined whether the duration during which the working current reaches or exceeds the locked-rotor current exceeds a second preset time.

[0025] In another aspect, a skin cleaning device includes: a controller, a rotary motor, a sampling circuit, and a power switch circuit;

[0026] The sampling circuit is used to obtain the voltage of the sampling point and send the voltage of the sampling point to the controller, or to obtain the working current of the rotating motor and send the working current to the controller;

[0027] The power switch circuit is used to receive the control signal sent by the controller to cut off or connect the power supply voltage of the rotating motor;

[0028] The controller is used to receive the working current sent by the sampling circuit, or convert the voltage of the sampling point sent by the sampling circuit into the working current after receiving it; it is also used to send a control signal to the power switch circuit to control the cutting off of the power supply voltage of the rotating motor after detecting that the working current reaches or exceeds the stall current, and accumulate the number of times the power supply voltage is cut off; and it is used to control the connection of the power supply voltage of the rotating motor when the number of times the power supply voltage is cut off does not reach the preset number of times and the cut-off time of the power supply voltage of the rotating motor reaches the first preset time.

[0029] Preferably, the power switch circuit includes a switch module and a diode; one end of the switch module is connected to the controller, and the other end is connected to one end of the diode, the other end of the diode is connected to the DC power supply voltage, and the diode is connected in parallel with the rotating motor to control whether the DC power supply voltage supplies power to the rotating motor when the controller outputs a high / low level control signal.

[0030] Preferably, the sampling circuit comprises a sampling resistor and an operational amplifier; the sampling resistor is arranged between the rotating motor and the input end of the operational amplifier; and the output end of the operational amplifier is connected to the controller.

[0031] Preferably, the first preset time is the time for compensating the output power exceeding the rated power during the period from when the working current exceeds the rated current to when the power supply is cut off.

[0032] Preferably, the skin cleaning device comprises a facial cleanser or a body cleanser.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) After detecting that the working current reaches or exceeds the stall current, the controller of the present invention sends a control signal to the power switch circuit to control the power supply voltage of the rotating motor to be cut off. When the power supply cut-off time of the rotating motor reaches a first preset time, the power supply voltage of the rotating motor is controlled to be turned on. Therefore, the power supply can be automatically cut off when the rotating motor is stalled to protect the rotating motor. When the stall is released, the rotating motor can be automatically restored to rotate, thereby improving the user experience.

[0035] (2) The first preset time of the present invention is the time for compensating the output power exceeding the rated power during the period from when the working current exceeds the rated current to when the power is cut off. Therefore, the cut-off time controlled according to the first preset time can ensure that the motor will not be overheated due to repeated restarts, and can ensure that the rotation is restored as soon as possible, thereby meeting the needs of users.

[0036] (3) After the stalling times reaches a preset number, that is, after the automatic restarts are repeated a preset number of times, the present invention will no longer automatically connect the power supply voltage, and the user must manually start the machine to prevent damage to the device.

[0037] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention so that it can be implemented in accordance with the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0038] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A basic flow chart of a control method for a skin cleaning device according to an embodiment of the present invention;

[0040] Figure 2 A method for obtaining a first preset time according to an embodiment of the present invention;

[0041] Figure 3 is a detailed flow chart of a control method of a skin cleaning device according to an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of a first preset time compensation of a control method according to an embodiment of the present invention;

[0043] Figure 5 FIG. 4 is a circuit diagram of a skin cleaning device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figure 1 As shown, this embodiment provides a control method for a skin cleaning device, including:

[0049] S101, obtaining the working current of the rotating motor of the skin cleaning device in real time;

[0050] S102, when it is detected that the working current reaches or exceeds the stall current, sending a control signal to the power switch circuit to control cutting off the power supply voltage of the rotating motor, and accumulating the number of times the power supply voltage is cut off;

[0051] S103, when the number of times the power supply voltage is cut off does not reach the preset number of times, and the cut-off time of the power supply of the rotating electrical machine reaches the first preset time, controlling to connect the power supply voltage of the rotating electrical machine.

[0052] In this embodiment, the control method is implemented on a controller. The stall current can be set to three times the idling current of the rotating motor. The preset number of times, the first preset time and the value of the stall current are pre-stored in the controller.

[0053] Specifically, the first preset time is the time for compensating the output power exceeding the rated power during the period from when the working current exceeds the rated current to when the power supply is cut off.

[0054] For further information, see Figure 2 As shown, the method for obtaining the first preset time is as follows:

[0055] S201, obtaining the total output power of the rotating motor from the time when the working current of the rotating motor exceeds the rated current to the time when the power supply is cut off;

[0056] S202, obtaining the equivalent total rated power of the rotating motor from the time when the working current of the rotating motor exceeds the rated current to the time when the power supply is cut off;

[0057] S203, taking a difference between the total output power and the total rated power, and dividing the difference by the rated power per unit time to obtain the first preset time.

[0058] See also Figure 3 and 4 As shown, in this embodiment, the rotating motor works normally during the time from 0 to t0, and the motor starts to work at over-rated power at time t0 (the power is equal to the product of the voltage at the sampling point and the working current, that is, the product of the power supply voltage and the working current. Since the power supply voltage of the motor remains unchanged, the over-rated power means that the working current exceeds the rated current). n When the stall power (stall current) reaches the judgment value, the motor power supply voltage is cut off. n Each interval time is the interval time T set by the program to collect the motor working power S , that is:

[0059] T S =t1-t0=t2-t1=......=t n -t n-1

[0060] Furthermore, the total output power of the rotating electrical machine is expressed as follows:

[0061] W total=(t1-t0)*P1+(t2-t1)*P2+......+(t n -t n-1 )*P n

[0062] =T S *(P1+P2+......+P n )

[0063] Among them, W total Indicates the total output power; T S Indicates the sampling period; P1, P2, ..., P n They represent the output power of the rotating motor in a single sampling period, which is equal to the product of the operating current of the rotating motor and the power supply voltage;

[0064] The equivalent total rated power of the rotating electrical machine is expressed as follows:

[0065] W r =n*T S *P r

[0066] Among them, W r represents the total rated power, n represents the number of sampling times from the time when the working current exceeds the rated current to the time when the power is cut off; P r It represents the rated power of a single sampling period, which is equal to the product of the rated current of the rotating motor and the power supply voltage;

[0067] The part that exceeds the rated power is W over equal:

[0068] W over =W total -W r

[0069] =T S *(P1+P2+......+P n )-n*T S *P r

[0070] In order to make the excess power W over Get compensation, assuming the power of the compensation part is W offset , then the compensation W offset ≥W over .

[0071] Since the rated power P r It is known that the compensation time is T a .

[0072] Then W offset =P r *Ta

[0073] That is, P r *T a ≥W over

[0074] We can get:

[0075] T a ≥(T S *(P1+P2+......+P n )-n*T S *P r ) / P r

[0076] According to P = UI (U is the motor power supply voltage, which remains unchanged), we can get:

[0077] T a ≥U*(T S *(I1+I2+......+I n )-n*T S *I r ) / I r

[0078] Where n represents the sampling times of the program from exceeding the rated power to judging the occurrence of stall, T S Indicates the sampling interval; I1~I n Indicates the working current of each sampling point, the rated current I r As the known parameters, it can be deduced that after the stall occurs, at T a =U*(T S *(I1+I2+......+I n )-n*T S *I r ) / I r This can ensure that the motor will not overheat and that the user can use it quickly after the motor stalls.

[0079] T a =U*(T S *(I1+I2+......+I n )-n*T S *I r ) / I r The obtained T a as the first preset time.

[0080] Specifically, Figure 3 In the process, the number of stall times N and the number of sampling times n are first initialized to 0, and then the working current is collected. If the working current I n Greater than or equal to the rated current I r, then add 1 to the sampling times n to further determine the working current I n Is it greater than or equal to the stall current I s (Stalled rotor current I s It can be set to more than three times the motor no-load current). If it is, the rotating motor stops, and the motor stall times increase by 1. When the stall times reach the preset times of 10 times, the power supply will not be automatically restarted, and the user will be waiting for manual restart. If it does not reach the preset times of 10 times, the required stop time T is calculated. a , the rotating motor stops for a first preset time T a When the power is turned on, the control turns on the power supply voltage.

[0081] Furthermore, before sending a control signal to the power switch circuit to control cutting off the power supply voltage of the rotating motor, the method further includes:

[0082] It is determined whether the duration during which the working current reaches or exceeds the locked-rotor current exceeds a second preset time.

[0083] Since the motor burnout is generally caused by long-term stalling and continuous high current heating inside the motor, the second preset time is a shorter value, which can be 1 to 2 seconds.

[0084] On the other hand, see Figure 5 As shown, a skin cleaning device comprises: a controller 10, a rotating motor 13, a sampling circuit 11 and a power switch circuit 12;

[0085] The sampling circuit 11 is used for sampling the voltage of the sampling point and sending the voltage of the sampling point to the controller 10, or for obtaining the working current of the rotating motor 13 and sending the working current to the controller 10;

[0086] The power switch circuit 12 is used to receive the control signal PWM_MOTO_CON sent by the controller 10 to cut off or connect the power supply voltage BAT_OUT of the rotating motor 13;

[0087] The controller 10 is used to receive the working current sent by the sampling circuit 11, or convert the voltage of the sampling point sent by the sampling circuit 11 into the working current; it is also used to send a control signal PWM_MOTO_CON to the power switch circuit 12 to control the cutting off of the power supply voltage BAT_OUT of the rotating motor 13 after detecting that the working current reaches or exceeds the stall current, and accumulate the number of times the power supply voltage BAT_OUT is cut off; and it is used to control the connection of the power supply voltage BAT_OUT of the rotating motor 13 when the number of times the power supply voltage BAT_OUT is cut off does not reach a preset number of times and the cut-off time of the power supply voltage BAT_OUT of the rotating motor 13 reaches a first preset time.

[0088] In this embodiment, the power switch circuit 12 includes a switch module and a diode D16; one end of the switch module is connected to the controller 10, and the other end is connected to one end of the diode D16, the other end of the diode D16 is connected to the DC power supply voltage BAT_OUT, and the diode D16 is connected in parallel with the rotating motor 13 to control whether the DC power supply voltage BAT_OUT supplies power to the rotating motor 13 when the controller 10 outputs a high / low level control signal PWM_MOTO_CON.

[0089] Specifically, when the control signal PWM_MOTO_CON outputs a high level, the switch module is turned on, and the power supply voltage BAT_OUT supplies power to the rotating motor 13; when the control signal PWM_MOTO_CON outputs a low level, the switch module is turned off, and the power supply voltage BAT_OUT does not supply power to the rotating motor 13.

[0090] In this embodiment, the sampling circuit 11 includes a sampling resistor and an operational amplifier U4 ; the sampling resistors R36 and R37 are arranged between the rotating motor 13 and the input end of the operational amplifier U4 ; and the output end of the operational amplifier U4 is connected to the controller 10 .

[0091] Specifically, the method for the sampling circuit 11 to obtain the voltage of the sampling point includes: obtaining the voltage of the sampling point (R36 in parallel with R37 (R36 / / R37)), amplifying it through the operational amplifier U4 and connecting it to the controller 10 (main control chip), the main control chip obtains the amplified voltage and then reversely calculates (divided by the amplification factor) to calculate the voltage of R36, and by calculating the voltage across (R36 in parallel with R37 (R36 / / R37)), and then dividing it by the resistance of (R36 in parallel with R37 (R36 / / R37)), the current passing through (R36 in parallel with R37 (R36 / / R37)) can be obtained. Since the current passing through the operational amplifier is very small, it can be ignored compared to the motor current, that is, the current passing through (R36 in parallel with R37 (R36 / / R37)) is the working current passing through the motor.

[0092] The switch module is a MOS tube Q2, the gate of the MOS tube Q2 is connected to the control signal PWM_MOTO_CON output terminal of the controller 10, the source of the MOS tube Q2 is grounded through parallel sampling resistors R36 and R37, the drain of the MOS tube Q2 is connected to the anode of the diode D16, the cathode of the diode D16 is connected to the power supply voltage BAT_OUT, and the diode D16 is connected in parallel with the rotating motor 13. The source of the MOS tube Q2 is also connected to the input terminal of the operational amplifier U4 through the resistor R32, and the output terminal of the operational amplifier U4 is connected to the sampling terminal of the controller 10.

[0093] In this embodiment, when the switch module is turned off, the motor will have a reverse electromotive force (reverse voltage), and the diode D16 is used to eliminate the reverse voltage of the reverse electromotive force.

[0094] Furthermore, the first preset time is the time for compensating the output power exceeding the rated power during the period from when the working current exceeds the rated current to when the power supply is cut off.

[0095] The specific calculation method of the first preset time refers to a control method of a skin cleaning device, which will not be repeated here.

[0096] Furthermore, the skin cleaning device of this embodiment can be used as a facial cleansing device for cleaning the face or a body cleansing device for cleaning the body.

[0097] In addition, the present invention provides a skin cleaning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method of the skin cleaning device when executing the program.

[0098] Specifically, the processor is configured to:

[0099] Acquire the working current of the rotating motor of the skin cleaning device in real time;

[0100] When it is detected that the working current reaches or exceeds the stall current, a control signal is sent to the power switch circuit to control cutting off the power supply voltage of the rotating motor, and the number of times the power supply voltage is cut off is accumulated;

[0101] When the number of times the power supply voltage is cut off does not reach the preset number and the cut-off time of the power supply of the rotating electrical machine reaches the first preset time, the power supply voltage of the rotating electrical machine is controlled to be turned on.

[0102] In this embodiment, the memory and the processor may be integrated on the controller and implemented by the controller.

[0103] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for controlling a skin cleaning device, characterized in that: include: Acquire the working current of the rotating motor of the skin cleaning device in real time; When it is detected that the working current reaches or exceeds the stall current, a control signal is sent to the power switch circuit to control cutting off the power supply of the rotating motor, and the number of times the power supply is cut off is accumulated; When the number of times the power supply is cut off does not reach the preset number of times, and the cut-off time of the power supply of the rotating motor reaches the first preset time, controlling to turn on the power supply of the rotating motor; The first preset time is the time for compensating the output power exceeding the rated power from the time when the working current exceeds the rated current to the time when the power is cut off.

2. The control method of the skin cleaning device according to claim 1, characterized in that: The method for obtaining the first preset time is as follows: Obtain the total output power of the rotating motor from the time when the working current of the rotating motor exceeds the rated current to the time when the power supply is cut off; Obtain the equivalent total rated power of the rotating motor from the time when the working current of the rotating motor exceeds the rated current to the time when the power supply is cut off; The first preset time is obtained by subtracting the total output power from the total rated power and dividing the result by the rated power per unit time.

3. The control method of the skin cleaning device according to claim 2, characterized in that: The total output power of the rotating electrical machine is expressed as follows: W total =T S *(P1+P2+......+P n ) Among them, W total Indicates the total output power; T S Indicates the sampling period; P1, P2, ..., P n They represent the output power of the rotating motor in a single sampling period, which is equal to the product of the working current of the rotating motor and the power supply voltage; The equivalent total rated power of the rotating electrical machine is expressed as follows: W r =n*T S *P r Among them, W r represents the total rated power, n represents the number of sampling times from the time when the working current exceeds the rated current to the time when the power is cut off; P r It represents the rated power of a single sampling period, which is equal to the product of the rated current of the rotating motor and the voltage of the power supply; The first preset time is expressed as follows: T a =(W total -W r ) / P r Among them, T a Indicates the first preset time.

4. The control method of the skin cleaning device according to claim 1, characterized in that: Before sending a control signal to the power switch circuit to control cutting off the power supply of the rotating motor, the method further includes: It is determined whether the duration during which the working current reaches or exceeds the locked-rotor current exceeds a second preset time.

5. A skin cleaning device, characterized in that: include: Controller, rotating motor, sampling circuit and power switch circuit; The sampling circuit is used to obtain the voltage of the sampling point and send the voltage of the sampling point to the controller, or to obtain the working current of the rotating motor and send the working current to the controller; The power switch circuit is used to receive the control signal sent by the controller to cut off or connect the power supply voltage of the rotating motor; The controller is used to receive the working current sent by the sampling circuit, or convert the voltage of the sampling point sent by the sampling circuit into the working current after receiving it; it is also used to send a control signal to the power switch circuit to control the power supply of the rotating motor to be cut off after detecting that the working current reaches or exceeds the stall current, and accumulate the number of times the power supply is cut off; and it is used to control the power supply of the rotating motor to be turned on when the number of times the power supply is cut off does not reach a preset number of times and the cut-off time of the power supply of the rotating motor reaches a first preset time; The first preset time is the time for compensating the output power exceeding the rated power from the time when the working current exceeds the rated current to the time when the power is cut off.

6. The skin cleaning device according to claim 5, characterized in that The power switch circuit includes a switch module and a diode; one end of the switch module is connected to the controller, and the other end is connected to one end of the diode, the other end of the diode is connected to a DC power supply, and the diode is connected in parallel with the rotating motor to control whether the DC power supply supplies power to the rotating motor when the controller outputs a high / low level control signal.

7. The skin cleaning device according to claim 5, characterized in that The sampling circuit includes a sampling resistor and an operational amplifier; the sampling resistor is arranged between the rotating motor and the input end of the operational amplifier; and the output end of the operational amplifier is connected to the controller.

8. The skin cleaning device according to claim 5, characterized in that The first preset time is the time for compensating the output power exceeding the rated power from the time when the working current exceeds the rated current to the time when the power is cut off.

9. The skin cleaning device according to claim 5, characterized in that: The skin cleaning device includes a facial cleansing device or a body cleansing device.

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