Cosmetic instrument and control method thereof

Abstract

The invention discloses a beauty instrument and a control method thereof, the beauty instrument comprises N lamp strings connected in series and parallel, a lamp bead power supply and a control module, any lamp string comprises a plurality of lamp beads connected in series, and N is an integer greater than 1; the lamp bead power supply is connected with the N lamp strings and is used for supplying power to the N lamp strings; the control module at least comprises a mirror image constant-current regulation and control unit, the mirror image constant-current regulation and control unit is connected with the N lamp strings, and the mirror image constant-current regulation and control unit is used for controlling branch currents flowing through branches where the lamp strings are located to be equal. According to the beauty instrument, the uniformity of a traditional control mode can be improved, meanwhile, the power consumption of a product can be optimized, and the endurance time of a battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of beauty instruments, and in particular to a beauty instrument and a control method thereof. Background Art

[0002] The LED lamp beads in the existing beauty instrument masks generally have a variety of serial connection methods, usually including the lamp beads series connection method, parallel connection method and series-parallel combination connection method. The series connection method is usually suitable for occasions with a small number of lamp beads and a high supply voltage, while the parallel connection method is suitable for situations with larger current requirements. Since most beauty instrument mask products are powered by batteries or adapters, and the number of lamp beads on the mask ranges from 50 to 1000, the existing beauty instrument masks usually control the LED lamp beads by a series-parallel combination connection method, and usually use a current-limiting resistor in series on each string of lamp beads to ensure the consistency of the current flowing through each string of lamp beads.

[0003] In the prior art, a current-limiting resistor is connected in series with each light string to balance the current, which easily leads to increased power consumption in the circuit and affects the battery life of the product. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the present invention is to provide a beauty instrument that can improve the uniformity of the traditional control method while optimizing the power consumption of the product and increasing the battery life.

[0005] The second object of the present invention is to provide a control method of a beauty instrument.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention proposes a beauty instrument, comprising: N strings of lights connected in parallel, any one of the strings of lights comprising a plurality of lamp beads connected in series, wherein N is an integer greater than 1; a lamp bead power supply, the lamp bead power supply being connected to the N strings of lights and being used to power the N strings of lights; a control module, the control module at least comprising a mirror constant current regulation unit, the mirror constant current regulation unit being connected to the N strings of lights, the mirror constant current regulation unit being used to control the branch currents flowing through the branches where the light strings are located to be equal.

[0007] According to the beauty instrument proposed in the embodiment of the present invention, a series-parallel connection method is adopted for the connection method of the lamp beads in the same area. A mirror constant current control unit is set to be connected with N strings of lamps to control the branch currents flowing through the branches where the lamp strings are located to be equal, that is, the currents flowing through each lamp bead are controlled to be equal, thereby realizing precise control of the current flowing through each string of lamps. Compared with the prior art of connecting a current limiting resistor in series on each string of lamps, the mirror constant current control unit can replace the current limiting resistors connected in series on each branch in the prior art, while meeting the uniformity requirements of the lamp beads in the same care area without causing voltage division, thereby optimizing circuit power consumption and increasing battery life.

[0008] In some embodiments of the present invention, the number of the lamp beads in any one of the lamp strings is equal.

[0009] In some embodiments of the present invention, the mirror constant current control unit includes: a power supply; an adjustable resistor, one end of which is connected to the power supply; and a mirror constant current source, which is respectively connected to the N strings of lights and the other end of the adjustable resistor.

[0010] In some embodiments of the present invention, the mirror constant current source includes: a first transistor, the collector and base of the first transistor are connected to the other end of the adjustable resistor; N second transistors, the collectors of the N second transistors are respectively connected in series with the N strings of light strings, the bases of the N second transistors are connected in parallel and connected to the base of the first transistor, and the emitters of the N second transistors are connected in parallel and connected to the emitter of the first transistor; wherein the current flowing through any one of the second transistors is equal to the current flowing through the first transistor.

[0011] In some embodiments of the present invention, the control module also includes: a lamp bead power supply control unit, one end of which is connected to the lamp bead power supply, and the other end of which is connected to the N strings of lights, the lamp bead power supply control unit being used to control the total current flowing through the N strings of lights; a gear setting unit, the gear setting unit being used to output a current gear signal in response to a gear setting instruction; a control unit, the control module being connected to the gear setting unit and the lamp bead power supply control unit, the control module being used to control the lamp bead power supply control unit according to the current gear signal.

[0012] In some embodiments of the present invention, the beauty instrument also includes: a current detection unit, which is connected to the lamp bead power supply control unit and the N strings of light strings, and the current detection unit is used to obtain a total current signal of the N strings of light strings; the control unit is connected to the current detection unit, and the control unit is used to control the lamp bead power supply control unit according to the total current signal to adjust the total current flowing through the N strings of light strings.

[0013] In some embodiments of the present invention, the control unit is connected to the adjustable resistor, and the control unit controls the current flowing through the first transistor by adjusting the resistance value of the adjustable resistor.

[0014] In order to achieve the above-mentioned purpose, a second aspect of the present invention proposes a control method of a beauty instrument, which is used for the beauty instrument described in any of the above embodiments, and the control method includes: in response to the gear setting instruction, obtaining the current gear signal of the N strings of light strings in the current working gear; determining the total current flowing through the N strings of light strings and the branch current flowing through the branches where each of the light strings is located according to the current gear signal, wherein the branch current flowing through the branches where each of the light strings is located is equal; and controlling the working state of the N strings of light strings according to the total current and the branch current.

[0015] According to the control method of the beauty instrument proposed in the embodiment of the present invention, it is used for the beauty instrument of any of the above embodiments, by obtaining the current gear signal of the N strings of light strings in the current working gear, and then determining the total current flowing through the N strings of light strings and the branch current flowing through the branches where each light string is located according to the current gear signal, and by setting a mirror constant current control unit connected to the N strings of light strings, it is possible to control the branch current flowing through the branches where each light string is located to be equal, thereby achieving precise control of the current flowing through each string of light strings, meeting the uniformity requirements of the lamp beads in the same care area, and not causing voltage division, thereby optimizing circuit power consumption and increasing battery life.

[0016] In some embodiments of the present invention, the control method of the beauty instrument further includes: obtaining the total current signal of the N strings of lights; and adjusting the total current according to the total current signal and the current gear signal.

[0017] In some embodiments of the present invention, the method for controlling the beauty instrument further includes: determining that the working time of the N strings of lights reaches a preset time length, and controlling the beauty instrument to exit the current working gear.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a block diagram of a beauty instrument according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a beauty instrument according to an embodiment of the present invention;

[0022] Figure 3 A circuit diagram of a connection method of lamp beads in series and parallel in the prior art;

[0023] Figure 4 is a block diagram of a beauty instrument according to another embodiment of the present invention;

[0024] Figure 5 The figure is a flow chart of a control method of a beauty instrument according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Beauty instrument 10;

[0027] N light strings 1, light bead power supply 2, control module 3, current detection unit 4;

[0028] Mirror image constant current control unit 31, lamp bead power control unit 32, gear setting unit 33, control unit 34;

[0029] Power supply 311, adjustable resistor 312, mirror image constant current source 313;

[0030] Fixed resistor R2, voltage detection structure 41, light string 1a, light string 2a, light string 3a, light string Na, transistor Q1, transistor Q2, transistor Q3, transistor Q4, transistor Q5, transistor Q6, and transistor Q7. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0032] In the prior art, when the lamp beads are controlled by a combination of series and parallel connection, the voltage drop of each lamp bead is different, which will cause the current flowing through each branch where the lamp beads connected in parallel are located to be inconsistent. Especially for the series connection of lamp beads of different specifications, the current difference in each branch will cause the light irradiance uniformity of the lamp beads on each branch to be very different. In addition, each string of lamp beads is connected in series with a current limiting resistor, which has a voltage dividing effect, thereby increasing the power consumption of the entire circuit, making it difficult to improve the battery life of the product. In response to this, an embodiment of the present invention proposes a beauty instrument that can optimize the power consumption of the product and increase the battery life while improving the uniformity of the traditional control method.

[0033] Reference below Figure 1-Figure 4 A beauty instrument according to an embodiment of the present invention is described. Figure 1 FIG. 4 is a block diagram of a beauty instrument according to an embodiment of the present invention.

[0034] like Figure 1 As shown, the beauty instrument 10 includes N light strings 1, a lamp bead power supply 2 and a control module 3, wherein the N light strings 1 are connected in parallel, and any one light string includes a plurality of lamp beads connected in series, wherein N is an integer greater than 1, wherein the value of N can be set according to actual needs, for example, N can be set to 5 or 8 or 10, etc., and the number of light strings is not specifically limited here.

[0035] In some embodiments, the number of lamp beads in any string of lamps is equal. It is understandable that for the lamp beads in the same nursing area, when the connection method of the lamp beads in the same area adopts a series-parallel connection method, in order to ensure the uniformity of the operation of the lamp beads in the same area, the number of lamp beads in any string of lamps in the area is usually equal, and by controlling the current flowing through each string of lamps to be the same, the current flowing through all the lamp beads in the nursing area can be ensured to be the same, thereby meeting the requirement for the uniformity of the operation of the lamp beads in the nursing area.

[0036] In some embodiments, the lamp bead power supply 2 is connected to N light strings 1 to supply power to the N light strings 1 , wherein the lamp bead power supply 2 is a total power supply and the current outputted by the lamp bead power supply 2 is the total current of the N light strings 1 .

[0037] Furthermore, the control module 3 may include a control unit for controlling various functions in the beauty instrument 10, such as a lamp bead power supply control unit for controlling the power supply to the lamp bead, a gear setting unit for gear control, and a general control unit, etc., which are not specifically limited here. Among them, the control module 3 of the embodiment of the present invention at least includes a mirror constant current control unit 31, and the mirror constant current control unit 31 is connected to the N strings of lamps 1. The mirror constant current control unit 31 is used to control the branch current flowing through the branches where each lamp string is located to be equal. Specifically, the mirror constant current control unit 31 can replace the current limiting resistor connected in series on each branch in the prior art, and realize accurate control of the current flowing through each string of lamps, which can not only meet the uniformity requirements of the lamp beads in the same care area, but also will not cause voltage division, thereby optimizing the power consumption of the circuit.

[0038] The beauty instrument 10 proposed in the embodiment of the present invention adopts a series-parallel connection method for connecting the lamp beads in the same area. A mirror constant current control unit 31 is set to be connected to N strings of lamp strings 1 to control the branch currents flowing through the branches where each lamp string is located to be equal, that is, to control the current flowing through each lamp bead to be equal, thereby achieving precise control of the current flowing through each string of lamps. Compared with the prior art of connecting a current limiting resistor in series on each string of lamps, the mirror constant current control unit 31 can replace the current limiting resistor connected in series on each branch in the prior art, while meeting the uniformity requirement of the lamp beads in the same care area without causing voltage division, thereby optimizing circuit power consumption and increasing battery life.

[0039] In some embodiments, Figure 2 FIG. 1 is a schematic diagram of a beauty instrument according to an embodiment of the present invention. The N light strings 1 may include light strings such as light string 1a, light string 2a, light string 3a, ..., light string Na, etc.

[0040] The following are all Figure 2 The total number of lamp beads shown in the figure is 30, the number of lamp strings is 6, that is, N is equal to 6, and each lamp string includes 5 lamp beads connected in series.

[0041] And, the lamp bead power supply 2 is used to provide a total power supply for driving N strings of lamps 1, such as Figure 2 As shown, the lamp bead power supply 2 is described here by taking the setting of 30V as an example, and the mirror constant current control unit 31 includes a power supply 311, an adjustable resistor 312 and a mirror constant current source 313, wherein one end of the adjustable resistor 312 is connected to the power supply 311, and the mirror constant current source 313 is respectively connected to the N string of light strings 1 and the other end of the adjustable resistor 312.

[0042] Among them, the power supply 311 can be set to a 5V power supply. The power supply 311 is set independently of the lamp bead power supply 2 and is used to power the mirror constant current control unit 31. The power supply 311 can also power other control units in the control module 3, which is not shown in the figure.

[0043] The adjustable resistor 312 is Figure 2 R1 in the figure can be a 1KΩ, 50% resistor, and its resistance value can be adjusted as needed. When the voltage value provided is fixed, the current passing through the mirror constant current source 313 can be changed by adjusting the resistance value of the adjustable resistor 312, so that the current flowing through each branch in the N string light string 1 can be adjusted in real time.

[0044] Specifically, in some embodiments, the mirror constant current source 313 includes: a first transistor and N second transistors, the collector and base of the first transistor are connected to the other end of the adjustable resistor 312, the collectors of the N second transistors are respectively connected in series with the N strings of light strings 1, the bases of the N second transistors are connected in parallel and connected to the base of the first transistor, and the emitters of the N second transistors are connected in parallel and connected to the emitter of the first transistor; wherein the current flowing through any second transistor is equal to the current flowing through the first transistor.

[0045] like Figure 2 As shown, taking 6 strings of lights connected in parallel as an example, the mirror constant current source 313 can include 7 transistors: 1 first transistor, namely transistor Q1, and 6 second transistors, namely transistors Q2-Q7, wherein the characteristics of transistor Q1 and transistors Q2-Q7 need to be exactly the same, for example, transistors Q1-Q7 can all be transistors of model 2N1711.

[0046] Specifically, by adjusting the adjustable resistor 312, the reference current value generated by the transistor Q1 is made to meet the required current value, and then the corresponding current I1 can be obtained at the collectors of the transistors Q2-Q7 through the mirror current source 313, as the bias current provided to any string of lights. Since the constant current I1 output by the transistors Q2-Q7 is substantially the same as the reference current output by the transistor Q1, the current passing through the transistors Q2-Q7 can be kept the same as the current passing through the transistor Q1, thereby achieving the purpose of controlling the branch currents flowing through the branches where the light strings are located to be equal.

[0047] like Figure 2 As shown, the beauty instrument 10 proposed in the embodiment of the present invention adopts 7 transistors to form a mirror constant current source 313. The branch where each string of lights is located adopts transistors to realize mirror current control. The branch current flowing through the branch where each string of lights is located can be adjusted to remain consistent, thereby ensuring the uniformity of light irradiance when the lamp beads are emitting light.

[0048] The following, combined Figure 2 and Figure 3 To understand the power consumption optimization effect of the series-parallel mirror constant current design of the embodiment of the present invention, as shown in FIG. Figure 3 As shown, it is a circuit diagram of a connection method of combining lamp beads in series and in parallel in the prior art, which shows that the entire circuit needs to drive 120 lamp beads, and adopts a design method of 12 strings of lamp beads in parallel, and each string of lamp beads has 10 lamp beads in series.

[0049] Specifically, the lamp bead circuit arrangement of the beauty instrument in the embodiment of the present invention is similar to the lamp bead circuit arrangement in the prior art. Figure 3 First of all, it can be understood that if the embodiment of the present invention adopts the following example, Figure 3 When designing the circuit for the connection method of the lamp beads in parallel, it is necessary to connect a second triode in series on each string of lights, that is, 12 second triodes need to be set, and a first triode is set in addition. The connection method of the 12 second triodes and one first triode can be referred to Figure 2 The connection method of the transistor Q1 and the transistors Q2-Q7 in the figure can be understood by referring to the above contents, which will not be repeated here.

[0050] Assume that the driving current required for each light string is 30mA and the voltage drop of each lamp bead is 2.2V. Figure 3 As shown, the traditional design requires a 10Ω-500Ω resistor to be connected in series in each string of lamp beads as a current limiting resistor to balance the branch current of each branch where the lamp strings are located. The calculation process of power consumption optimization in this case is as follows. Assume that the voltage drop of each lamp bead is 2.2V, the resistance of the series current limiting resistor is 100Ω, 10 lamp beads are connected in series on each string of lamps, and the driving current of each string of lamps is 30mA, for a total of 12 strings of lamps. The power P2 of the traditional design consists of two parts: P3 is the power consumed by the lamp beads, and P4 is the power consumed by the resistor. The total power P2 can be calculated as: P2=P3+P4=2.2*10*0.03*12+0.03 2 *100*12=7.92+1.08=9W.

[0051] For the circuit design method of the embodiment of the present invention, assuming that the voltage drop of each lamp bead is 2.2V, there are 10 lamp beads in a string, the driving current of each lamp string is 30mA, there are 12 lamp strings in total, and the transistors in each branch do not produce a voltage drop, then the power P1 of the series-parallel mirror constant current design of the embodiment of the present invention is: P1=2.2*10*0.03*12=7.92W; after calculation, the circuit design method of the present application is optimized for power consumption compared to the circuit design method in the prior art: (P2-P1) / P1=13.6%.

[0052] Based on the above, according to the beauty instrument 10 proposed in the embodiment of the present invention, the mirror constant current control unit 31 can replace the current limiting resistor connected in series on each branch in the prior art by adopting a transistor, so as to realize precise control of the current flowing through each string of lights, and control the branch currents flowing through the branches where each light string is located to be equal, that is, control the current flowing through each lamp bead to be equal, and will not cause voltage division, thereby optimizing the circuit power consumption.

[0053] In some embodiments of the present invention, Figure 4 , which is a block diagram of a beauty instrument according to another embodiment of the present invention, wherein the control module 3 further includes a lamp power supply control unit 32 , a gear setting unit 33 and a control unit 34 .

[0054] One end of the lamp bead power control unit 32 is connected to the lamp bead power supply 2, and the other end of the lamp bead power control unit 32 is connected to the N string of light strings 1, and the lamp bead power control unit 32 is used to control the total current flowing through the N string of light strings 1. Specifically, one end of the lamp bead power control unit 32 is connected to the lamp bead power supply 2, and the other end is connected to the N string of light strings 1, so as to control the total current flowing through the N string of light strings 1.

[0055] The gear setting unit 33 is used to output a current gear signal in response to a gear setting instruction. Specifically, the gear setting unit 33 is used for gear selection control. The user can experience different effects by selecting different working gears. Specifically, different working gears correspond to different current sizes and different working times. The gear setting unit 33 is connected to the gear setting button on the beauty instrument 10. The user can select different working gears by clicking or touching the button module. It can also be connected to a mobile terminal for communication. The mobile terminal downloads an APP (Application) adapted to the beauty instrument 10. The user can select the working gear by operating the APP. Among them, the mobile terminal includes but is not limited to mobile phones, iPads and computers.

[0056] The control unit 34 is connected to the gear setting unit 33 and the lamp bead power supply control unit 32, and the control unit 34 is used to control the lamp bead power supply control unit 32 according to the current gear signal. Specifically, after selecting different working gears, the user will send the corresponding gear setting instruction to the gear setting unit 33, and the gear setting unit 33 will respond to the gear setting instruction and send the current gear signal to the control unit 34. The control unit 34 can further send the total current signal of the N strings of light strings 1 to the control lamp bead power supply control unit 32 according to the current gear signal, and the lamp bead power supply control unit 32 controls the lamp bead power supply 2 to output the total current flowing through the N strings of light strings 1.

[0057] It is understandable that the beauty instrument 10 may be affected by some factors during the actual operation, resulting in the total current during actual operation being different from the set current under the current working gear, and there will be a deviation between the two. The current detection unit 4 can detect the total current flowing through the N strings of light strings 1 in real time, and the control unit 34 can control the lamp bead power supply control unit 32 to further adjust the current according to the detected total current flowing through the N strings of light strings 1, so that the total current flowing through the N strings of light strings 1 reaches the set value.

[0058] In some embodiments of the present invention, Figure 4 As shown, the beauty instrument 10 further includes a current detection unit 4, which is connected to the lamp bead power control unit 32 and the N-string light strings 1, and is used to obtain the total current signal of the N-string light strings 1. The control unit 34 is connected to the current detection unit 4, and the control unit 34 is used to control the lamp bead power control unit 32 according to the total current signal to adjust the total current flowing through the N-string light strings 1.

[0059] Specifically, it can be combined Figure 2 and Figure 4 Understand the current detection unit 4 of the embodiment of the present invention, as Figure 2 and Figure 4 As shown, the current detection unit 4 includes a fixed resistor R2 and a voltage detection structure 41, wherein the total current output by the lamp bead power supply 2 will generate a voltage drop when passing through the resistor R2, and the input end of the voltage detection structure 41 is respectively connected to the two ends of the fixed resistor R2, for detecting the voltage signal at both ends of the fixed resistor R2, and the output end of the voltage detection structure 41 is connected to the control unit 34, for sending the detected voltage signal to the control unit 34, and the voltage detection structure 41 can use an operational amplifier to detect the potential difference at both ends of the fixed resistor R2, that is, the voltage signal, and transmit the voltage signal to the control unit 34. The control unit 34 determines the current flowing through the fixed resistor R2, that is, the total current signal, according to the acquired voltage signal and the fixed resistor R2.

[0060] The power detection unit 4, the lamp bead power control unit 32 and the control unit 34 together form a closed loop. The control unit 34 can control the lamp bead power control unit 32 according to the total current signal of the N light strings 1 obtained by the current detection unit 4 to further realize real-time detection and adjustment of the total current flowing through the N light strings 1.

[0061] The following combination Figure 5 To understand the control method of the beauty instrument according to the embodiment of the present invention, Figure 5 1 is a flow chart of a control method of a beauty instrument according to an embodiment of the present invention. The control method of a beauty instrument is used for the beauty instrument 10 of any of the above embodiments. The control method at least includes steps S1-S3, which are specifically as follows.

[0062] S1, in response to the gear setting instruction, obtaining the current gear signal of N light strings in the current working gear.

[0063] The beauty instrument of the embodiment of the present invention may be provided with a button for setting the working gear, or an APP compatible with the beauty instrument may be downloaded on the mobile terminal, and the user may select different working gears by clicking or touching the button module, or the beauty instrument may be connected to the mobile terminal for communication, and the user may select the working gear by operating the APP. The mobile terminal includes but is not limited to a mobile phone, iPad and computer. The beauty instrument can respond to the gear setting instruction to obtain the current gear signal of the N strings of lights in the current working gear.

[0064] S2, determining the total current flowing through the N light strings and the branch current flowing through the branches where the light strings are located according to the current gear signal, wherein the branch current flowing through the branches where the light strings are located are equal.

[0065] Taking the connection method of the lamp beads in the same area of ​​the beauty instrument using a combination of series and parallel connection as an example, it is necessary to determine the total current that should flow through the N strings of lamps and the branch current flowing through the branches where each lamp string is located under the current working gear according to the current gear signal.

[0066] S3, controlling the working state of the N light strings according to the total current and the branch current.

[0067] Combination Figure 2 and Figure 4 As can be seen from the above embodiments, the beauty instrument in the embodiment of the present invention can replace the current-limiting resistors connected in series on each branch in the prior art by providing a mirror constant current control unit, thereby achieving precise control of the current flowing through each string of lights, which can not only meet the uniformity requirements of the lamp beads in the same care area, but also will not cause voltage division, thereby optimizing the circuit power consumption.

[0068] The control method of the beauty instrument proposed in the embodiment of the present invention is used for the beauty instrument 10 of any of the above embodiments, by obtaining the current gear signal of the N strings of light strings 1 under the current working gear, and then determining the total current flowing through the N strings of light strings 1 and the branch current flowing through the branches where each light string is located according to the current gear signal, and by setting a mirror constant current control unit 31 connected to the N strings of light strings 1, the branch current flowing through the branches where each light string is located can be controlled to be equal, thereby achieving precise control of the current flowing through each string of light strings, meeting the uniformity requirements of the lamp beads in the same care area, and not causing voltage division, thereby optimizing circuit power consumption and increasing battery life.

[0069] In some embodiments of the present invention, the control method of the beauty instrument further includes: obtaining a total current signal of N light strings; and adjusting the total current according to the total current signal and the current gear signal.

[0070] Specifically, according to Figure 4 The process of adjusting the total current in the embodiments of the present invention can be understood from the contents of the above embodiments. First, the total current signal of the N light strings is obtained by the current detection module, and then the control unit further controls the lamp bead power supply control unit to adjust the total current according to the detected total current signal, so that the actual current is the same as the set current under the current working gear.

[0071] In some embodiments of the present invention, the method for controlling the beauty instrument further includes: determining that the working time of the N light strings reaches a preset time length, and controlling the beauty instrument to exit the current working gear.

[0072] Specifically, the beauty instrument is set with different gears when in use, and the different gears are preset to correspond to different working times. The user will press buttons when using the beauty instrument, and the internal control unit will automatically match the working time corresponding to the current working gear according to the user's gear selection.

[0073] Furthermore, when the working time of the N light strings reaches a preset time, that is, when the beauty instrument completes the current working process, the control unit will control the beauty instrument to exit the current working gear.

[0074] Based on the above, according to the beauty instrument and control method thereof proposed in the embodiment of the present invention, by obtaining the current gear signal of the N strings of light strings under the current working gear, and then determining the total current flowing through the N strings of light strings and the branch current flowing through the branches where each light string is located according to the current gear signal, and controlling the working state of the N strings of light strings according to the total current and the branch current, the total current and the branch current flowing through each string of light strings can be accurately controlled in real time, and a current detection function is set at the total current, and the detected current value is fed back to the control unit, and the control unit is used to further realize the dynamic adjustment of the current, so as to realize the gear control of the overall lamp bead current. In addition, through the mirror constant current control unit, it is not necessary to connect a current limiting resistor in series on the branch of each string of light strings to control the branch current flowing through the branches where each light string is located to be equal, which can greatly reduce power consumption while ensuring the uniformity of the illumination amplitude of the lamp beads in the same area.

[0075] In the description of the present invention, "plurality" means two or more.

[0076] Other structures and operations of the beauty instrument 10 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0078] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A beauty instrument, characterized in that: include: N strings of lights connected in parallel, any one of which comprises a plurality of lamp beads connected in series, wherein N is an integer greater than 1; A lamp bead power supply, which is connected to the N strings of lamps and is used to supply power to the N strings of lamps; A control module, wherein the control module at least includes a mirror image constant current control unit, wherein the mirror image constant current control unit is connected to the N strings of light strings, and the mirror image constant current control unit is used to control the branch currents flowing through the branches where the light strings are located to be equal.

2. The beauty instrument according to claim 1, characterized in that: The number of the lamp beads in any one of the lamp strings is equal.

3. The beauty instrument according to claim 1, characterized in that: The mirror image constant current control unit comprises: Power supply; An adjustable resistor, one end of which is connected to the power supply; A mirror image constant current source is connected to the N strings of lights and the other end of the adjustable resistor respectively.

4. The beauty instrument according to claim 3, characterized in that: The mirror image constant current source comprises: A first triode, wherein the collector and the base of the first triode are connected to the other end of the adjustable resistor; N second triodes, the collectors of the N second triodes are respectively connected in series with the N strings of the light strings, the bases of the N second triodes are connected in parallel and connected to the base of the first triode, and the emitters of the N second triodes are connected in parallel and connected to the emitter of the first triode; The current flowing through any one of the second transistors is equal to the current flowing through the first transistor.

5. The beauty instrument according to claim 3, characterized in that: The control module also includes: A lamp bead power supply control unit, one end of which is connected to the lamp bead power supply, and the other end of which is connected to the N strings of lights, and the lamp bead power supply control unit is used to control the total current flowing through the N strings of lights; A gear setting unit, the gear setting unit is used to output a current gear signal in response to a gear setting instruction; A control unit, wherein the control module is connected to the gear setting unit and the lamp bead power control unit, and the control module is used to control the lamp bead power control unit according to the current gear signal.

6. The beauty instrument according to claim 5, characterized in that: Also includes: A current detection unit, the current detection unit is connected to the lamp bead power control unit and the N strings of lamps, and the current detection unit is used to obtain a total current signal of the N strings of lamps; The control unit is connected to the current detection unit, and the control unit is used to control the lamp bead power supply control unit according to the total current signal to adjust the total current flowing through the N strings of lamps.

7. The beauty instrument according to claim 5, characterized in that: The control unit is connected to the adjustable resistor, and the control unit controls the current flowing through the first transistor by adjusting the resistance value of the adjustable resistor.

8. A method for controlling a beauty instrument, characterized in that: For the beauty instrument according to any one of claims 1 to 7, the control method comprises: In response to the gear setting instruction, obtaining the current gear signal of the N strings of lights in the current working gear; Determine the total current flowing through the N strings of the light strings and the branch current flowing through the branches where the light strings are located according to the current gear signal, wherein the branch current flowing through the branches where the light strings are located are equal; The working states of the N light strings are controlled according to the total current and the branch current.

9. The control method of the beauty instrument according to claim 8, characterized in that: Also includes: Obtaining the total current signal of the N strings of lights; The total current is adjusted according to the total current signal and the current gear signal.

10. The control method of the beauty instrument according to claim 9, characterized in that: Also includes: Determine that the working time of the N light strings reaches a preset time, and control the beauty instrument to exit the current working gear.

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