Constant temperature controlled hair growth device and method

Abstract

The application relates to a constant-temperature control hair growth device and method, wherein the constant-temperature control hair growth device comprises a parameter receiving module for receiving a reference scalp temperature and a reference time; lamp beads which are uniformly distributed on the inner side of a shell and are used for emitting laser; a lamp bead temperature detection module for detecting the lamp bead temperature; the installation positions of the lamp bead temperature detection modules on the inner side of the shell are matched with the installation positions of the lamp beads; an ambient temperature detection module for detecting the ambient temperature; scalp temperature detection modules which are uniformly distributed on the inner side of the shell and are used for detecting actual scalp temperatures; and a control module for adjusting the duty cycle of laser emission of each lamp bead in real time based on the actual scalp temperature, the lamp bead temperature, the ambient temperature and the reference scalp temperature; the control module is also used for adjusting the reference time in real time based on the ambient temperature, the reference time and a preset optimization target, and the application solves the problem of slow hair growth speed in the process of promoting hair growth.

Description

Technical Field

[0001] This application relates to the field of laser technology, and in particular to a thermostatically controlled hair growth device and method. Background Technology

[0002] To prevent hair loss or promote hair growth in healthy individuals, various head-mounted hair growth devices have emerged on the market. Their core working principle involves using low-energy lasers emitted by the device to irradiate the scalp, activating hair follicles and thus promoting hair growth. However, in these technologies, prolonged laser / LED irradiation can cause the scalp temperature to rise due to the photothermal effect. Excessively high temperatures can not only cause discomfort or burns to the user but also inhibit hair follicle activity, resulting in slower hair growth.

[0003] Currently, no effective solution has been proposed to address the issue of slow hair growth during the hair growth process promoted by head-mounted hair growth devices in related technologies. Summary of the Invention

[0004] This application provides a constant temperature controlled hair growth device and method to at least solve the problem of slow hair growth in related technologies.

[0005] In a first aspect, embodiments of this application provide a constant temperature controlled hair growth device, the device comprising: a housing, a parameter receiving module, a scalp temperature detection module, an LED bead, an LED bead temperature detection module, a room temperature detection module, and a control module;

[0006] The parameter receiving module is used to receive reference scalp temperature and reference time;

[0007] The LED beads are evenly distributed inside the housing and are used to emit lasers to the target scalp.

[0008] The lamp bead temperature detection module is used to detect the lamp bead temperature; the installation position of each lamp bead temperature detection module inside the housing matches the installation position of each lamp bead.

[0009] The room temperature detection module is used to detect the ambient temperature;

[0010] The scalp temperature detection module is evenly distributed inside the housing and is used to detect the actual scalp temperature of the target scalp.

[0011] The control module is used to adjust the duty cycle of the laser emitted by each LED in real time based on the actual scalp temperature, the LED temperature, the ambient temperature, and the reference scalp temperature.

[0012] The control module is also used to adjust the reference time in real time based on the ambient temperature, the reference time, and a preset optimization target.

[0013] In some embodiments, the scalp temperature detection module includes:

[0014] An embedded temperature-sensing resistor is located at the end of the scalp temperature detection module that is relatively close to the scalp, and is used to collect the actual scalp temperature.

[0015] A pressure detection membrane is located at the end of the scalp temperature detection module that is relatively far from the scalp, and is used to detect scalp pressure;

[0016] A spring, located between the embedded temperature sensing resistor and the pressure sensing diaphragm, is used to push the embedded temperature sensing resistor tightly against the scalp and transmit the spring pressure to the pressure sensing diaphragm.

[0017] In some embodiments, the control module is further configured to obtain the average scalp temperature based on the actual scalp temperature and the scalp pressure;

[0018] The control module is also used to generate an alarm signal based on the actual scalp temperature; obtain an incremental control quantity based on the scalp temperature uniformity and the reference scalp temperature; obtain an adaptive base duty cycle based on the alarm signal, the ambient temperature and the incremental control quantity; and adjust the duty cycle of the laser emitted by each LED based on the adaptive base duty cycle and the LED temperature.

[0019] The control module is also used to obtain the actual running time based on the ambient temperature and the reference time; and to adjust the actual running time based on a preset optimization target.

[0020] In some embodiments, the control module is further configured to set the alarm signal to a set state if any of the actual scalp temperatures is greater than a preset threshold.

[0021] In some embodiments, the control module is further configured to obtain a control deviation based on the scalp temperature uniformity and the reference scalp temperature;

[0022] The control module is also used to perform integral calculation on the control deviation to obtain the integral term of the control deviation; and to perform differential calculation on the control deviation to obtain the differential term of the control deviation.

[0023] The control module is also used to obtain the incremental control quantity based on the control deviation, the integral term of the control deviation, and the derivative term of the control deviation;

[0024] The control module is also used to set the incremental control quantity to the preset incremental threshold when the incremental control quantity exceeds the preset incremental threshold.

[0025] In some embodiments, the control module is further configured to obtain the adaptive base duty cycle based on the preset rated base duty cycle, the ambient temperature, and the incremental control quantity when the alarm signal state is not set and the control deviation is greater than a preset deviation threshold.

[0026] The control module is also used to obtain the adaptive base duty cycle based on the rated base duty cycle and the ambient temperature when the alarm signal status is not set and the control deviation is less than or equal to the preset deviation threshold.

[0027] The control module is also used to set the adaptive base duty cycle to zero when the alarm signal status is set.

[0028] In some embodiments, the control module is further configured to obtain a temperature coefficient based on the ambient temperature and a preset temperature attenuation coefficient when the alarm signal is not set and the control deviation is greater than a preset deviation threshold.

[0029] The control module is also used to obtain the adaptive base duty cycle based on the temperature coefficient, the rated reference duty cycle, and the incremental control quantity.

[0030] In some embodiments, the device further includes a pneumatic circuit module;

[0031] The air circuit module includes a first silent fan and a second silent fan; the first silent fan is located at the air inlet on one side of the housing and is used to draw in external air into the constant temperature controlled hair growth device; the second silent fan is located at the air outlet on the other side of the housing and is used to output internal air to the outside.

[0032] In some embodiments, the control module is further configured to activate the first silent fan and the second silent fan when the maximum value of the temperatures of the plurality of LED beads is greater than or equal to a first temperature threshold.

[0033] The control module is also used to set the duty cycle of the laser emitted by the lamp beads whose temperature is greater than the second temperature threshold to zero, and to activate the first silent fan and the second silent fan when the maximum value of the temperature of the multiple lamp beads is between the second temperature threshold and the third temperature threshold.

[0034] The control module is also used to set the duty cycle of all LED beads emitting lasers to zero and activate the first silent fan and the second silent fan when the maximum value of the temperature of multiple LED beads is greater than the third temperature threshold or the maximum value of the actual scalp temperature of multiple LED beads is greater than the fourth temperature threshold.

[0035] Secondly, embodiments of this application provide a constant-temperature controlled hair growth method, applied to the constant-temperature controlled hair growth device described in the first aspect above, the method comprising:

[0036] The system acquires a reference scalp temperature and a reference time; it also acquires the ambient temperature, multiple LED temperatures, and multiple actual scalp temperatures; the multiple actual scalp temperatures are collected by multiple scalp detection devices.

[0037] Based on the actual scalp temperature, the LED bead temperature, the ambient temperature, and the reference scalp temperature, the duty cycle of the laser emitted by each LED bead is adjusted in real time.

[0038] The reference time is adjusted in real time based on the ambient temperature, the reference time, and the preset optimization target.

[0039] Compared to related technologies, the constant temperature controlled hair growth device and method provided in this application embodiment includes: a housing, a parameter receiving module, a scalp temperature detection module, LED beads, an LED bead temperature detection module, a room temperature detection module, and a control module. The parameter receiving module receives a reference scalp temperature and a reference time. The LED beads are evenly distributed inside the housing and emit laser light to the target scalp. The LED bead temperature detection module detects the LED bead temperature. The installation position of each LED bead temperature detection module inside the housing matches the installation position of each LED bead. The room temperature detection module detects the ambient temperature. The scalp temperature detection modules are evenly distributed inside the housing and detect the actual scalp temperature of the target scalp. The control module adjusts the duty cycle of the laser emitted by each LED bead in real time based on the actual scalp temperature, LED bead temperature, ambient temperature, and reference scalp temperature. The control module also adjusts the reference time in real time based on the ambient temperature, reference time, and a preset optimization target, thus solving the problem of slow hair growth during the hair growth process promoted by head-mounted hair growth devices in related technologies.

[0040] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0041] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0042] Figure 1 This is a hardware structure block diagram of a constant temperature controlled hair growth device terminal according to an embodiment of this application;

[0043] Figure 2This is a schematic diagram of the scalp temperature detection device according to an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of a constant temperature controlled hair growth device according to an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the control module according to an embodiment of this application;

[0046] Figure 5 This is a flowchart of a constant temperature controlled hair growth method according to an embodiment of this application. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated 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 application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application. Furthermore, it is understood that although the efforts made in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, modifications to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0048] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0049] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application means two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The terms “first,” “second,” “third,” etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0050] The method embodiments provided in this example can be executed on a terminal, computer, or similar computing device. Taking running on a terminal as an example, Figure 1 This is a hardware structure block diagram of a terminal of a constant temperature controlled hair growth device according to an embodiment of this application. Figure 1 As shown, a terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. Optionally, the terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the terminal described above. For example, the terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0051] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the constant temperature control hair growth device in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thus implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0052] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0053] This embodiment provides a constant temperature controlled hair growth device, which includes: a housing, a parameter receiving module, a scalp temperature detection module, an LED bead, an LED bead temperature detection module, a room temperature detection module, and a control module;

[0054] The parameter receiving module is used to receive reference scalp temperature and reference time;

[0055] The LED beads are evenly distributed inside the housing and are used to emit lasers to the target scalp.

[0056] The lamp bead temperature detection module is used to detect the lamp bead temperature; the installation position of each lamp bead temperature detection module inside the housing matches the installation position of each lamp bead.

[0057] The room temperature detection module is used to detect the ambient temperature;

[0058] The scalp temperature detection module is evenly distributed inside the housing and is used to detect the actual scalp temperature of the target scalp.

[0059] The control module is used to adjust the duty cycle of the laser emitted by each LED in real time based on the actual scalp temperature, the LED temperature, the ambient temperature, and the reference scalp temperature.

[0060] The control module is also used to adjust the reference time in real time based on the ambient temperature, the reference time, and a preset optimization target.

[0061] The constant temperature control hair growth device provided in this embodiment uses the shell as the basic support structure. The shell not only provides installation space for each functional module, but its inner side also needs to be adapted to the scalp contour to provide a stable installation reference for core components such as LED beads and scalp temperature detection module. The outer side is provided with air inlet and air outlet, which work with the air circuit module to realize air circulation and ensure a stable temperature regulation environment inside the device and in the area in contact with the scalp.

[0062] As the core interface for the device to interact with external commands, the parameter receiving module can accurately receive the reference scalp temperature (such as the ideal temperature range for different types of hair loss, such as 35.5℃–36.5℃ for androgenetic alopecia and 34℃–35℃ for alopecia areata) and reference time (the initially set reference duration, such as 20 minutes at the reference temperature) set by the user or the preset system, and transmit these parameters to the control module in real time as the benchmark for subsequent temperature and time adjustments.

[0063] As the core component of the hair growth device, the LED beads can use 650nm low-energy laser technology. Based on the principle of adapting to the physiological structure of the scalp (such as the top of the head, forehead, temples and other key areas prone to hair loss), they are arranged radially or symmetrically on the inside of the shell at preset equal distances. This can fully cover the target scalp area and activate hair follicles and promote hair growth by emitting low-intensity laser light to irradiate the scalp. The distribution density and position design must ensure that all areas of the scalp receive light evenly and avoid insufficient or excessive local irradiation intensity.

[0064] The LED bead temperature detection module is assembled one-to-one with each LED bead. Each detection module consists of a temperature sensing chip, and its installation position is strictly matched with the position of the corresponding LED bead. It can capture the temperature changes of the LED bead in real time, accurately detect the actual working temperature of each LED bead, and feed the data back to the control module in real time. This provides a key basis for the temperature protection and output power adjustment of the LED bead, and avoids the LED bead from overheating and affecting its service life or safety.

[0065] The room temperature detection module consists of a platinum resistance thermometer installed at the air inlet of the housing and a matching processing circuit. It can use the good linearity of the platinum resistance thermometer in the range of 10℃-40℃ to detect the real-time temperature of the surrounding environment with high precision. This temperature data is used to correct the luminous efficacy decay of the LED (the luminous efficacy will decrease when the ambient temperature rises) and to provide an environmental benchmark for the control module to adjust the reference time, so as to ensure the adaptability of parameters under different room temperatures.

[0066] The scalp temperature detection module consists of a platinum temperature sensor with embedded flexible contacts, a pressure sensor, and a fixing sleeve. Based on the principle of adapting to the physiological structure of the scalp, the components are arranged radially or symmetrically on the inner side of the shell at preset equal distances. Its soft gel structure, combined with the spring design, allows it to fit snugly against the scalp through the combined action of gravity and spring force when worn. The platinum sensor accurately detects the actual temperature of the target scalp, while the pressure sensor determines the fit (ensuring the accuracy of temperature detection). The detected actual scalp temperature data is transmitted to the control module in real time as the core feedback signal for constant temperature regulation.

[0067] The control module is responsible for multi-dimensional parameter processing and dynamic adjustment. On the one hand, it receives the actual scalp temperature, LED temperature, ambient temperature, and reference scalp temperature. Through a PID control algorithm based on multi-sensor fusion, it calculates the incremental control quantity and adjusts the laser emission intensity of each LED in real time using a PWM duty cycle (e.g., reducing the duty cycle when the temperature is too high and increasing the duty cycle when it is too low) to ensure that the scalp temperature remains stable within the reference range. On the other hand, based on the ambient temperature, reference time, and preset optimization targets, it adjusts the reference time in real time using a preset time decay coefficient formula. At the same time, it integrates safety protection mechanisms (such as over-temperature alarm, fan linkage, and LED shutdown logic) to ensure the safety and effectiveness of the process.

[0068] In the above embodiments, the constant temperature control hair growth device achieves precise control of scalp temperature through the coordinated operation of various modules: the parameter receiving module ensures accurate input of reference temperature and time for different types of hair loss; the uniform distribution of LED beads and scalp temperature detection modules ensures comprehensive laser irradiation and temperature monitoring; the LED bead temperature detection and room temperature detection modules provide multi-dimensional temperature feedback; and the control module adjusts the LED bead duty cycle in real time based on multi-sensor data to maintain the scalp temperature in the range of 34℃–37℃. At the same time, it dynamically adjusts the reference time in combination with the ambient temperature, effectively avoiding the problem of excessively high scalp temperature caused by prolonged laser irradiation, which leads to slow hair growth.

[0069] In some embodiments, the scalp temperature detection module includes:

[0070] An embedded temperature-sensing resistor is located at the end of the scalp temperature detection module that is relatively close to the scalp, and is used to collect the actual scalp temperature.

[0071] A pressure detection membrane is located at the end of the scalp temperature detection module that is relatively far from the scalp, and is used to detect scalp pressure;

[0072] A spring, located between the embedded temperature sensing resistor and the pressure sensing diaphragm, is used to push the embedded temperature sensing resistor tightly against the scalp and transmit the spring pressure to the pressure sensing diaphragm.

[0073] An embedded temperature-sensing resistor is integrated into the scalp temperature detection module at the scalp-facing end. A gold-platinum resistor is preferred, utilizing its linear temperature response characteristics within the 34℃–37℃ range to directly contact the scalp epidermis and collect real-time temperature. The core value of this design lies in overcoming the "error bottleneck of non-contact temperature measurement": only when the resistor is in close contact with the scalp can it accurately reflect the scalp's thermal metabolism (avoiding environmental radiation and airflow interference). This provides precise underlying data for the control module to calculate temperature deviations and dynamically adjust the LED duty cycle, ensuring the accuracy of constant temperature control from the source.

[0074] The pressure-sensing membrane is deployed on the side of the scalp temperature sensing module facing away from the scalp (adjacent to the spring) and uses a flexible thin-film pressure sensor. Its function is to establish a dimension for judging the "validity of temperature detection": when the pressure is too low, it indicates that the temperature sensing resistor is not in close contact with the scalp (the temperature data may be "falsely high / low" due to air gaps); when the pressure is too high, it indicates that it is worn too tightly (causing scalp pressure and even affecting blood circulation). By converting pressure signals into electrical signals and transmitting them to the control module, the temperature data corresponding to abnormal pressure can be marked with a "confidence level" (for auxiliary algorithm correction), or a wearing prompt can be output through the main control board. At the same time, pressure also participates in the calculation of scalp temperature. The greater the pressure, the more sufficient the sensor is in contact with the scalp, and the higher the reliability of the actual scalp temperature data collected. The lower the pressure, the more likely there will be errors in temperature detection due to contact gaps. Through pressure-weighted fusion, higher weight can be given to data from closely fitting sensors, and lower weight can be given to data from poorly fitting sensors. This makes the calculated scalp temperature value more realistic and accurate in reflecting the actual overall temperature of the scalp, providing a reliable basis for the control module to make precise PWM duty cycle adjustments based on temperature data and maintain the scalp temperature in the range of 34℃–37℃.

[0075] A spring is embedded between the embedded temperature-sensing resistor and the pressure-sensing membrane. It uses a micro-compression spring with a customized elastic coefficient. On the one hand, it drives the temperature-sensing resistor to actively conform to the curvature of the scalp through continuous elastic thrust, dynamically compensating for the displacement gap caused by head movements (such as turning or lowering the head) during the wearing of the device, and eliminating the blind spot in local temperature detection caused by the deformation of the head-mounted device. On the other hand, it linearly transmits the reaction force of the scalp on the temperature-sensing resistor to the pressure-sensing membrane, so that the pressure data truly reflects the fit quality of the "device-scalp", providing a physical basis for the pressure detection module to judge the effectiveness of temperature measurement. Finally, through the synergy of mechanical structure and sensing, the anti-interference capability and data reliability of the scalp temperature detection system are enhanced.

[0076] In the above embodiments, the scalp temperature detection module achieves triple technical gains through the collaborative design of an embedded temperature-sensing resistor (near the scalp, accurately capturing temperatures in the 34–37℃ range), a pressure-sensing membrane (far from the scalp, quantifying the "device-scalp" contact pressure), and a spring (intermediate layer, providing mechanical thrust to ensure contact and conduct pressure): the spring compensates for temperature measurement blind spots caused by head movement and wearing deformation, ensuring the temperature-sensing resistor remains in close contact with the scalp; the pressure-sensing membrane converts the scalp reaction force into an electrical signal, providing a basis for the control module to judge the reliability of the temperature measurement data and calculate the average scalp temperature; and the embedded temperature-sensing resistor, with stable contact ensured by the spring, outputs high-precision temperature based on its linear characteristics. The three elements work together to improve the anti-interference capability and data reliability of temperature detection, laying a core foundation for the control module to accurately adjust the duty cycle of the LED beads and maintain the reference temperature range.

[0077] Figure 2 This is a schematic diagram of the scalp temperature detection device according to an embodiment of this application. Figure 2 As shown, the device has a cavity frame consisting of a base 201 and a top cover 202. Inside, there is a spring 203, a pressure sensing membrane 204, a soft gel body 206 with an embedded temperature sensing resistor 205, and a sensor lead 207. The temperature sensing resistor 205 is embedded at the front end of the soft gel body 206. When the device is worn on the patient's head, under the combined action of gravity and the spring 203, the soft gel body 206 pushes the temperature sensing resistor 205 to press against the scalp, thus realizing scalp temperature detection. At the same time, the pressure sensing membrane 204 behind the spring 203 can sense the pressure applied to the scalp and transmit the pressure signal to the control module to provide pressure detection feedback.

[0078] In some embodiments, the control module is further configured to obtain the average scalp temperature based on the actual scalp temperature and the scalp pressure;

[0079] The control module is also used to generate an alarm signal based on the actual scalp temperature; obtain an incremental control quantity based on the scalp temperature uniformity and the reference scalp temperature; obtain an adaptive base duty cycle based on the alarm signal, the ambient temperature and the incremental control quantity; and adjust the duty cycle of the laser emitted by each LED based on the adaptive base duty cycle and the LED temperature.

[0080] The control module is also used to obtain the actual running time based on the ambient temperature and the reference time; and to adjust the actual running time based on a preset optimization target.

[0081] Specifically, firstly, based on the actual scalp temperature T collected by each scalp temperature detection module... S,i and corresponding scalp contact pressure P iA pressure-weighted fusion algorithm (i.e., assigning higher weights to detection point data that are more closely fitted and under greater pressure) is used to obtain the average scalp temperature T, which reflects the true state of the scalp. S The formula is as follows:

[0082] ;

[0083] Among them, T S This refers to the average scalp temperature, or the average scalp temperature; T S,i P represents the actual local scalp temperature collected by the i-th scalp temperature detection module. i denoted as , where is the contact pressure between the i-th module and the scalp; N is the total number of scalp temperature detection modules.

[0084] Secondly, the actual scalp temperature is monitored in real time. When the temperature at any location exceeds a preset critical threshold (e.g., 38℃), an alarm signal is generated (Alarm=1). When the temperature does not exceed the limit, Alarm=0. The alarm signal is also based on the deviation between the average scalp temperature and the reference scalp temperature (e(t)=T). set -T S The incremental control quantity (Δu) is calculated using a PID control law; subsequently, it is combined with the alarm signal (Alarm) and the real-time ambient temperature (T). r The adaptive base duty cycle (u) is determined according to a segmented strategy, along with the incremental control quantity Δu. base If the temperature deviation is greater than the preset deviation threshold, an incremental control value is added; if the deviation is less than or equal to the preset deviation threshold, the baseline value is maintained. Next, for each LED temperature (T... l,j The difference between the temperature of the LED and the average temperature of the LED is compensated locally (Δu). j Adjusting the duty cycle of individual LED beads achieves uniform LED bead temperature. The specific formula is as follows:

[0085] ;

[0086] Where, Δu j u is the adjustment amount for the duty cycle of the j-th LED. base For adaptive base duty cycle; T l,j Temperature of each LED bead; H is the average temperature of the LED beads; H() is the step function.

[0087] In addition, based on the ambient temperature and reference time, the initial actual running time is calculated using the following formula:

[0088] ;

[0089] Among them, t max t0 is the initial actual running time; t0 is the set reference time; k t T is the time decay coefficient; rReal-time ambient temperature; T ref This is for reference ambient temperature (can be set to 25℃).

[0090] Then, the actual running time is dynamically adjusted based on the preset optimization target J, and the accuracy, safety, and effectiveness of the entire process are ultimately ensured through multi-stage collaboration. The formula for the optimization target J is as follows:

[0091] ;

[0092] in, This is a temperature tracking term, used to penalize the deviation between the actual temperature and the target temperature. (T) S To ensure even scalp temperature, T set For reference scalp temperature, α is the temperature accuracy weight; This is the energy consumption term, and its function is to drive the system to reduce power consumption. u is the duty cycle of the LED, and β is the energy consumption weight. This is a safety penalty item, designed to severely punish situations where the local temperature exceeds 37°C. max γ represents the highest local temperature of the scalp, and γ is the safety weight. This is an environmental compensation item, designed to enhance compensation in high-temperature environments and appropriately extend the compensation time in low-temperature environments. For environment-adaptive weights, T r For real-time ambient temperature, is the temperature coefficient; T is the corrected actual running time.

[0093] Through the above steps, the control module constructs a collaborative system of "precise temperature detection, intelligent duty cycle control, and dynamic time management" by performing pressure-weighted temperature equalization, generating duty cycles in multiple dimensions (alarm-triggered emergency response, and dynamic adjustment driven by environment and deviation), providing LED-level compensation (balancing local temperature differences), and adjusting time based on environment and optimization goals. Pressure-weighted temperature equalization provides a reliable benchmark for temperature control, while LED-level compensation prevents localized overheating. Environmental adaptation and multi-objective optimization in time control achieve a dynamic balance between "overheating prevention (safety), energy saving (battery life), and maintaining dosage (therapeutic effect)." Ultimately, this achieves stable scalp temperature within the golden range of 34–37℃, ensuring effectiveness while maintaining safety and energy efficiency in different environments and wearing conditions.

[0094] In some embodiments, the control module is further configured to set the alarm signal to a set state if any of the actual scalp temperatures is greater than a preset threshold.

[0095] Specifically, the actual scalp temperature is monitored in real time. When the temperature at any location exceeds a preset critical threshold (such as 38°C), an alarm signal is generated (Alarm=1). If the temperature does not exceed the limit, Alarm=0.

[0096] Through the above steps, a precise and rapid response to the risk of local thermal runaway is achieved: when the temperature in any area exceeds the limit due to abnormal LED beads or wearing too tightly, Alarm=1 can immediately trigger the protection mechanism (such as cutting off the power of the corresponding LED beads and issuing an audible and visual warning), avoiding the risk of burns or hair follicle activity inhibition caused by local overheating being masked by overall temperature uniformity; when the temperature does not exceed the limit, Alarm=0 maintains normal operation, ensuring both the bottom line of local temperature safety and avoiding the impact of excessive protection on continuity, thus ensuring safety and reliability.

[0097] In some embodiments, the control module is further configured to obtain a control deviation based on the scalp temperature uniformity and the reference scalp temperature;

[0098] The control module is also used to perform integral calculation on the control deviation to obtain the integral term of the control deviation; and to perform differential calculation on the control deviation to obtain the differential term of the control deviation.

[0099] The control module is also used to obtain the incremental control quantity based on the control deviation, the integral term of the control deviation, and the derivative term of the control deviation;

[0100] The control module is also used to set the incremental control quantity to the preset incremental threshold when the incremental control quantity exceeds the preset incremental threshold.

[0101] Specifically, the control module first uses scalp temperature equalization T... s Compared with reference scalp temperature T set The difference is used to calculate the control deviation (e(t)=T). set -T S This deviation directly reflects the degree of deviation between the current temperature control system and the target state. Subsequently, the control deviation is integrated to obtain the integral term, which is used to eliminate persistent small steady-state deviations. Simultaneously, the control deviation is differentiated to obtain the differential term, which predicts temperature trends by capturing the rate of change of the deviation (e.g., predicting impending overheating when the deviation increases rapidly), enabling early adjustment to reduce overshoot. Based on this, the control module combines the proportional coefficient K... p Integral coefficient K i Differential coefficient K d The incremental control quantity used to adjust the lamp power is obtained by weighted summation of the control deviation, integral term, and derivative term. The specific formula is as follows:

[0102] ;

[0103] Where Δu is the incremental control quantity; It is a proportional term; It is an integral term; This is the differential term.

[0104] When the calculated incremental control value exceeds the preset control value threshold, it is forcibly limited to the threshold (to prevent u base Exceeding 100% here for u base To limit the amplitude, experiments have shown that it is only necessary to ensure that Δu does not exceed 25%, u base It won't exceed 100%.

[0105] In the above steps, the degree of temperature deviation from the target is determined by calculating the control deviation. The integral stage eliminates long-term steady-state deviations such as gradual environmental changes. The differential stage captures the deviation trend and suppresses overshoot in advance. The three are weighted and synthesized into an incremental control quantity to achieve coordinated regulation of "real-time response, long-term convergence, and trend prediction". An incremental threshold limit is added to avoid the duty cycle from exceeding 100% due to sudden changes in the control quantity. Finally, a closed-loop temperature control system of "precise perception - dynamic adjustment - safety constraint" is constructed to ensure that the scalp temperature converges steadily within the golden range for hair growth.

[0106] In some embodiments, the control module is further configured to obtain the adaptive base duty cycle based on the preset rated base duty cycle, the ambient temperature, and the incremental control quantity when the alarm signal state is not set and the control deviation is greater than a preset deviation threshold.

[0107] The control module is also used to obtain the adaptive base duty cycle based on the rated base duty cycle and the ambient temperature when the alarm signal status is not set and the control deviation is less than or equal to the preset deviation threshold.

[0108] The control module is also used to set the adaptive base duty cycle to zero when the alarm signal status is set.

[0109] Specifically, when the alarm signal is not set (Alarm=0) and the control deviation (e(t)=T) Set -T S If the temperature exceeds the preset deviation threshold (which can be set to 0.5℃), the rated reference duty cycle will be used as the basis, combined with the ambient temperature coefficient. The incremental control quantity Δu is used to obtain the adaptive base duty cycle, achieving coordinated adjustment of "baseline power + environmental compensation + dynamic correction" to quickly reduce temperature deviation; when the alarm signal is not set (Alarm=0) and the control deviation (e(t)=T) Set -T SWhen the duty cycle is less than or equal to the preset deviation threshold, the adaptive base duty cycle is calculated solely based on the rated reference duty cycle and ambient temperature to avoid minor fluctuations introduced by incremental control and maintain temperature stability. However, when the alarm signal is set (indicating a risk of localized overheating, such as an actual scalp temperature ≥38℃ at a certain point), the adaptive base duty cycle is forcibly set to zero, immediately cutting off laser output. This "emergency stop control" blocks heat input, preventing burns or hair follicle damage at the source. The specific formula is as follows:

[0110] ;

[0111] Among them, u base For adaptive base duty cycle; Alarm is the alarm signal; u nom This is the rated reference duty cycle; Δu is the temperature coefficient; e(t) is the incremental control quantity; and e(t) is the control deviation.

[0112] In the above steps, the layered strategy ensures both rapid adjustment accuracy when there is a large deviation and operational stability when there is a small deviation. It also strengthens the safety baseline through the zero duty cycle mechanism when the alarm is set, thus achieving the triple goal of "precise temperature control - stable operation - safety protection".

[0113] In some embodiments, the control module is further configured to obtain a temperature coefficient based on the ambient temperature and a preset temperature attenuation coefficient when the alarm signal is not set and the control deviation is greater than a preset deviation threshold.

[0114] The control module is also used to obtain the adaptive base duty cycle based on the temperature coefficient, the rated reference duty cycle, and the incremental control quantity.

[0115] Specifically, when the alarm signal is not set (Alarm=0) and the control deviation (e(t)=T) Set -T S When the deviation exceeds the preset threshold, the temperature coefficient is first calculated based on the real-time ambient temperature and the preset temperature attenuation coefficient; the specific formula is as follows:

[0116] ;

[0117] in, k is the temperature coefficient. η The temperature effect attenuation coefficient (can be set to 0.015 / ℃); T r Real-time ambient temperature; T ref For reference environmental dimensions (can be set to 25℃).

[0118] Subsequently, the temperature coefficient is multiplied by the rated reference duty cycle to obtain the environmentally adapted reference power. Then, the incremental control quantity output by the PID algorithm is added to obtain the adaptive base duty cycle.

[0119] In the above steps, the control module first obtains the temperature coefficient based on the ambient temperature and the preset temperature attenuation coefficient. Then, it determines the adaptive base duty cycle by combining the temperature coefficient, the rated reference duty cycle, and the incremental control quantity. This process realizes dynamic compensation for the influence of ambient temperature. When the temperature deviates significantly from the target, it can quickly reduce the deviation by precisely adjusting the duty cycle of the LED beads, ensuring that the scalp temperature is stable in the golden range conducive to hair growth. At the same time, it takes into account the light efficiency attenuation factor of the LED beads, improving the accuracy and adaptability of temperature control.

[0120] In some embodiments, the device further includes a pneumatic circuit module;

[0121] The air circuit module includes a first silent fan and a second silent fan; the first silent fan is located at the air inlet on one side of the housing and is used to draw in external air into the constant temperature controlled hair growth device; the second silent fan is located at the air outlet on the other side of the housing and is used to output internal air to the outside.

[0122] Specifically, the air circuit module adopts a dual silent fan to construct a directional convection heat dissipation system: the first silent fan is embedded in the air inlet on the temporal side of the shell, actively drawing in cold air from the outside in a low-noise mode, and using the thermal conduction characteristics of air to simultaneously replace the waste heat emitted by the internal LED array and main control circuit; the second silent fan is symmetrically deployed at the air outlet on the other side, working together to draw in the heated air inside and discharge it outward, helping to accurately maintain the golden range of 34℃–37℃ for hair growth.

[0123] In the above embodiments, the air circuit module draws in external air through the first silent fan and exhausts internal air through the second silent fan, forming a directional air circulation. This can quickly remove the heat generated by the LED beads, circuits and other components during the operation of the constant temperature control hair growth device, avoiding the impact of internal temperature accumulation on performance stability or causing LED bead light decay. At the same time, the airflow circulation can dynamically adjust the temperature inside the device and the scalp contact area, helping to maintain the scalp in a suitable temperature range and reducing local heat accumulation.

[0124] In some embodiments, the control module is further configured to activate the first silent fan and the second silent fan when the maximum value of the temperatures of the plurality of LED beads is greater than a first temperature threshold.

[0125] The control module is also used to set the duty cycle of the laser emitted by the lamp beads whose temperature is greater than the second temperature threshold to zero, and to activate the first silent fan and the second silent fan when the maximum value of the temperature of the multiple lamp beads is between the second temperature threshold and the third temperature threshold.

[0126] The control module is also used to set the duty cycle of all LED beads emitting lasers to zero and activate the first silent fan and the second silent fan when the maximum value of the temperature of multiple LED beads is greater than the third temperature threshold or the maximum value of the actual scalp temperature of multiple LED beads is greater than the fourth temperature threshold.

[0127] Specifically, when the maximum temperature of multiple LED beads is greater than or equal to the first temperature threshold (e.g., T... l,max When the temperature is ≥34℃, the control module activates the first and second silent fans to dissipate heat from the LEDs through air circulation in the air path module, preventing the temperature from rising further. When the maximum temperature of multiple LEDs is between the second and third temperature thresholds (e.g., 37℃≤T), l,max ≤39℃), the control module not only activates two silent fans to enhance heat dissipation, but also sets the laser emission duty cycle of LEDs with temperatures exceeding the second temperature threshold (e.g., 37℃) to zero, specifically shutting down overheated LEDs to prevent abnormal local temperature rises; and if the maximum temperature of multiple LEDs exceeds the third temperature threshold (e.g., T... l,max >39℃), or the maximum value of multiple actual scalp temperatures exceeds the fourth temperature threshold (e.g., T). s,max When the temperature exceeds 38℃, the control module will set the laser emission duty cycle of all LED beads to zero and activate two silent fans to dissipate heat at full capacity. By completely cutting off the laser heat source and enhancing heat dissipation, it avoids damage to the equipment from overheating of the LED beads or discomfort caused by excessive scalp temperature and inhibition of hair follicle activity from the root cause. It achieves graded safety protection from early warning to local intervention to comprehensive protection, ensuring the safety and effectiveness of the device operation.

[0128] Figure 3 This is a schematic diagram of a constant temperature controlled hair growth device according to an embodiment of this application, as shown below. Figure 3 As shown, the constant temperature controlled hair growth device is a head-mounted structure. A first silent fan 302 and a room temperature detection module 303 are arranged sequentially at the left air inlet 301. Scalp temperature detection modules 304 and LED beads 305 are evenly distributed on the inner curved surface of the shell. LED bead temperature detection modules 306 are arranged next to each LED bead 305. The air path is separated by an acrylic 307. The main control board 308 is arranged on the top. A second silent fan 310 is arranged at the right air outlet 309 and connected to each component through an FPC soft film 311.

[0129] Figure 4 This is a system architecture diagram of a constant temperature controlled hair growth device according to an embodiment of this application. Figure 4As shown, the room temperature detection module 303 (temperature sensor + signal conditioning), N scalp temperature detection modules 304 (temperature / pressure sensor + signal conditioning), and M LED bead temperature detection modules 306 (temperature sensor + signal conditioning) collect multiple analog signals, which are then converted into digital signals by the analog-to-digital converter 404 within the control module. In the control module 405, K pulse width modulation modules 406 calculate the duty cycle based on temperature data and reference values, and drive the corresponding lamp group 408 to emit lasers through constant current control 407. The communication module 409 is responsible for data exchange, and the power supply module 410 supplies power to the entire system. One lamp group can correspond to multiple LED beads, with a total of K lamp groups and a one-to-one correspondence between the pulse width modulation module and the lamp group.

[0130] This embodiment also provides a constant temperature controlled hair growth method, which is applied to the constant temperature controlled hair growth device in any of the above-mentioned device embodiments. Figure 5 This is a flowchart of a constant temperature controlled hair regrowth method according to an embodiment of this application, such as... Figure 5 As shown, the process includes the following steps:

[0131] Step S501: Obtain reference scalp temperature and reference time; obtain ambient temperature, multiple LED temperatures and multiple actual scalp temperatures; the multiple actual scalp temperatures are collected by multiple scalp detection devices;

[0132] Step S502: Based on the actual scalp temperature, LED bead temperature, ambient temperature and reference scalp temperature, adjust the duty cycle of the laser emitted by each LED bead in real time.

[0133] Specifically, using a reference scalp temperature as the benchmark, and combining the actual scalp temperature collected by multiple scalp temperature detection devices (the average scalp temperature is calculated through pressure-weighted fusion, and the detection validity is judged based on pressure data), the lamp bead temperature obtained by the temperature detection module installed next to each lamp bead, and the ambient temperature collected by the room temperature detection module, the laser emission duty cycle of each lamp bead is adjusted in real time through multi-dimensional parameter collaborative analysis: First, based on the deviation between the actual scalp temperature and the reference value, the incremental control quantity is obtained by combining integral and differential calculations; then, the temperature coefficient is determined according to the ambient temperature and the preset temperature effect attenuation coefficient; the adaptive base duty cycle is obtained by combining the rated reference duty cycle and the alarm signal status; finally, local compensation is performed for the difference between the temperature of each lamp bead and the average temperature, ensuring that the output power of each lamp bead can be dynamically adapted when the ambient temperature changes, the individual temperature difference of the lamp bead, and the actual scalp temperature fluctuates.

[0134] Step S503: Based on the ambient temperature, reference time, and preset optimization target, the reference time is adjusted in real time.

[0135] Specifically, based on the ambient temperature collected by the room temperature detection module, the reference time obtained by the parameter receiving module, and the preset optimization objectives (integrating multi-dimensional indicators such as temperature tracking accuracy, energy consumption, safety penalties, and environmental compensation), the reference time is adjusted in real time: first, the initial actual running time is calculated by combining the difference between the ambient temperature and the reference ambient temperature (e.g., 25℃) with the time decay coefficient; then, the time is further corrected according to the optimization objectives, while balancing energy consumption and safety risks. Ultimately, the adjusted actual running time can adapt to the needs under different ambient temperatures and meet the preset multi-objective optimization requirements, ensuring the effectiveness, safety, and economy of the laser-stimulated hair growth process.

[0136] In steps S501 to S503 above, firstly, by acquiring reference scalp temperature, reference time, ambient temperature, LED temperature, and multiple actual scalp temperatures, a comprehensive data foundation is provided for regulation. Secondly, based on these parameters, the laser duty cycle of each LED is adjusted in real time. Combining the deviation between the scalp temperature and the reference value, the individual temperature difference of the LEDs, and environmental influences, the scalp temperature is ensured to remain stable within the golden range of 34–37℃, avoiding overheating that inhibits hair follicle activity or insufficient temperature that affects hair growth speed. Finally, the reference time is adjusted in combination with ambient temperature, reference time, and preset optimization targets to adapt the duration to different environments. While ensuring safety and effectiveness, an optimized balance between energy consumption and effect is achieved, ultimately improving the accuracy, safety, and adaptability of laser-stimulated hair growth.

[0137] Furthermore, in conjunction with the isothermal hair regrowth method in the above embodiments, this application embodiment can provide a storage medium for implementation. This storage medium stores a computer program; when executed by a processor, the computer program implements any of the isothermal hair regrowth methods in the above embodiments.

[0138] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0139] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0140] Those skilled in the art should understand that 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 have been 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.

[0141] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A constant temperature controlled hair growth device, characterized in that, The device includes: a housing, a parameter receiving module, a scalp temperature detection module, an LED, an LED temperature detection module, a room temperature detection module, and a control module; The parameter receiving module is used to receive reference scalp temperature and reference time; The LED beads are evenly distributed inside the housing and are used to emit lasers to the target scalp. The lamp bead temperature detection module is used to detect the lamp bead temperature; the installation position of each lamp bead temperature detection module inside the housing matches the installation position of each lamp bead. The room temperature detection module is used to detect the ambient temperature; The scalp temperature detection module is evenly distributed inside the housing and is used to detect the actual scalp temperature of the target scalp. The scalp temperature detection module includes: An embedded temperature-sensing resistor is located at the end of the scalp temperature detection module that is relatively close to the scalp, and is used to collect the actual scalp temperature. A pressure detection membrane is located at the end of the scalp temperature detection module that is relatively far from the scalp, and is used to detect scalp pressure; A spring, located between the embedded temperature sensing resistor and the pressure sensing membrane, is used to push the embedded temperature sensing resistor tightly against the scalp and transmit the spring pressure to the pressure sensing membrane. The control module is configured to: adjust the duty cycle of the laser emitted by each LED in real time based on the actual scalp temperature, the LED temperature, the ambient temperature, and the reference scalp temperature; obtain the average scalp temperature based on the actual scalp temperature and the scalp pressure; generate an alarm signal based on the actual scalp temperature; obtain an incremental control quantity based on the average scalp temperature and the reference scalp temperature; obtain an adaptive base duty cycle based on the alarm signal, the ambient temperature, and the incremental control quantity; and adjust the duty cycle of the laser emitted by each LED based on the adaptive base duty cycle and the LED temperature. The control module is further configured to adjust the reference time in real time based on the ambient temperature, the reference time, and a preset optimization target; and to obtain the actual running time based on the ambient temperature and the reference time; and to adjust the actual running time based on the preset optimization target.

2. The constant temperature controlled hair growth device according to claim 1, characterized in that, The control module is also used to set the alarm signal to a set state when any of the actual scalp temperatures is greater than a preset threshold.

3. The constant temperature controlled hair growth device according to claim 1, characterized in that, The control module is also used to obtain a control deviation based on the scalp temperature uniformity and the reference scalp temperature; The control module is also used to perform integral calculation on the control deviation to obtain the integral term of the control deviation; and to perform differential calculation on the control deviation to obtain the differential term of the control deviation. The control module is also used to obtain the incremental control quantity based on the control deviation, the integral term of the control deviation, and the derivative term of the control deviation; The control module is also used to set the incremental control quantity to the preset incremental threshold when the incremental control quantity exceeds the preset incremental threshold.

4. The constant temperature controlled hair growth device according to claim 3, characterized in that, The control module is also used to obtain the adaptive base duty cycle based on the preset rated base duty cycle, the ambient temperature, and the incremental control quantity when the alarm signal status is not set and the control deviation is greater than the preset deviation threshold. The control module is also used to obtain the adaptive base duty cycle based on the rated base duty cycle and the ambient temperature when the alarm signal status is not set and the control deviation is less than or equal to the preset deviation threshold. The control module is also used to set the adaptive base duty cycle to zero when the alarm signal status is set.

5. The constant temperature controlled hair growth device according to claim 4, characterized in that, The control module is also used to obtain a temperature coefficient based on the ambient temperature and a preset temperature attenuation coefficient when the alarm signal is not set and the control deviation is greater than a preset deviation threshold. The control module is also used to obtain the adaptive base duty cycle based on the temperature coefficient, the rated reference duty cycle, and the incremental control quantity.

6. The constant temperature controlled hair growth device according to claim 1, characterized in that, The device also includes a pneumatic circuit module; The air circuit module includes a first silent fan and a second silent fan; the first silent fan is located at the air inlet on one side of the housing and is used to draw in external air into the constant temperature controlled hair growth device; the second silent fan is located at the air outlet on the other side of the housing and is used to output internal air to the outside.

7. The constant temperature controlled hair growth device according to claim 6, characterized in that, The control module is also used to activate the first silent fan and the second silent fan when the maximum value of the temperature of the plurality of LED beads is greater than or equal to a first temperature threshold. The control module is also used to set the duty cycle of the laser emitted by the lamp beads whose temperature is greater than the second temperature threshold to zero, and to activate the first silent fan and the second silent fan when the maximum value of the temperature of the multiple lamp beads is between the second temperature threshold and the third temperature threshold. The control module is also used to set the duty cycle of all LED beads emitting lasers to zero and activate the first silent fan and the second silent fan when the maximum value of the temperature of multiple LED beads is greater than the third temperature threshold or the maximum value of the actual scalp temperature of multiple LED beads is greater than the fourth temperature threshold.

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