Control method of light source type medical beauty product with constant energy output

Abstract

The invention discloses a control method for a light source type medical beauty product with constant energy output. Aiming at the problem that the later performance of the existing light source type medical beauty product is reduced due to fixed power output and light attenuation characteristics, the initial light source rated power PRATED is calibrated through a built-in light source light attenuation curve characteristic table. When a product works, the accumulated working time of the light source is recorded in real time, the corresponding light attenuation coefficient k is searched, and a new duty ratio signal is calculated according to the light attenuation coefficient k and PRATED to adjust power drive, so that the energy output of the target light source is maintained. The invention has the advantages of effectively overcoming the influence of light attenuation, controlling the output fluctuation of light source energy in an extremely small range in a long-time use process through experimental verification, ensuring the stable performance of the product in the whole life cycle, continuously providing a stable beauty effect and improving the user experience, and has important application value in the field of medical beauty.

Description

Technical Field

[0001] The present invention relates to the field related to the regulation of microbial competition and symbiosis after returning agricultural waste to fields, and specifically to a control method for a light source medical beauty product with constant energy output. Background Art

[0002] In the field of medical beauty, light source products such as xenon lamps and LED lamps are widely used. Traditional light source medical beauty products usually use a fixed power output mode throughout the entire use cycle. However, light source products have a light decay characteristic that cannot be ignored. As the working time increases, the energy output per unit power will gradually decrease. For example, in a long-term monitoring experiment on a number of common LED medical beauty lamps on the market, it was found that after 500 hours of continuous work, the luminous flux of these lamps decreased by an average of about 20% compared to the initial state. This directly led to the product in the later stage of use. Due to insufficient light source output energy, the beauty effect was greatly reduced. Moreover, this fixed power output mode cannot adapt to the dynamic changes in light source performance, which makes the actual efficacy of the product vary greatly in different working stages, making it difficult to meet users' needs for stable and efficient beauty effects. Summary of the invention

[0003] The purpose of the present invention is to provide a control method for a medical beauty product light source with constant energy output to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a control method for a medical beauty product of a light source with constant energy output, wherein a light decay curve characteristic table of a light source at different working hours is pre-stored inside the product, and is used to obtain the light decay coefficient k corresponding to the light source at each working stage, wherein the light decay coefficient k represents the relationship between the output luminous flux of the light source at unit power and the working time; There is a calibrated initial product with a light source rated power P when the light source target energy output is reached. RATED The steps specifically include: using a processor to output different duty cycle signals to a power driver according to a fixed unit time, the power driver supplies power to the light source, and at the same time detecting the energy of the light source through an energy detection instrument; when it is detected that the energy of the light source is greater than the target constant energy, the processor reduces the duty cycle signal; when it is detected that the energy of the light source is less than the target constant energy, the processor increases the duty cycle signal; until it is detected that the energy of the light source is equal to the target constant energy, at this time the duty cycle signal output by the processor is determined as the rated power P of the product light source RATED , and the processor saves the value; During the normal operation of the product, the total accumulated working time of the light source is recorded in real time, and the light decay coefficient k corresponding to the current total working time is found according to the light decay curve characteristic table; According to the obtained light attenuation coefficient k and the calibrated light source rated power P RATED , calculate the new duty cycle signal in real time according to the formula, that is, the real-time duty cycle signal output = (1 / k) * P RATED By adjusting the duty cycle signal, the power driver is controlled to change the output power of the light source, thereby ensuring that the target light source energy output is maintained throughout the product life cycle, where the light source output power is positively correlated with the duty cycle signal size.

[0005] Furthermore, the light decay curve characteristic table is obtained as follows: in a standard laboratory environment, the temperature is maintained at 25°C ± 2°C, and the humidity is controlled at 40%-60%; at least 10 groups of the same light source medical beauty product samples are used, and the luminous flux and power of each sample are measured every 100 hours, and the test is continued for 1000 hours; the light decay coefficient k is determined by accurately calculating the change in the ratio of luminous flux to power, and a light decay curve characteristic table is formed after statistical analysis; for example, when testing xenon lamp samples, it is found that the light decay coefficient is approximately 0.85 when the working time is 500 hours. The data will be accurately recorded in the characteristic table, and this table is stored in the internal Flash memory of the product to ensure stable reading.

[0006] Furthermore, the accuracy requirements of the energy detection instrument are extremely strict; the relative error of measuring the energy of the light source shall not exceed ±0.5%; the instrument uses a high-precision photodiode as a light sensor, and its response wavelength range covers the main luminous band of the product light source, such as for common LED beauty light sources, the wavelength covers 400-700nm; the instrument is equipped with a high-precision A / D conversion module with a resolution of 16 bits, which can accurately convert the optical signal into a digital signal for processing, and automatically calibrate once every 100 hours of work, using a standard light source for comparison and adjustment to ensure long-term measurement accuracy and stability.

[0007] Furthermore, the processor adopts a PID control algorithm when adjusting the duty cycle signal; the proportional coefficient K of the algorithm is p Set to 0.8, the integral time constant T i is 0.5 seconds, the differential time constant T d is 0.1 second; when the deviation between the light source energy fed back by the energy detection instrument and the target energy is within 1%, the algorithm can quickly calculate the duty cycle adjustment amount within 10 milliseconds and complete the output adjustment of the duty cycle signal within 50 milliseconds; in actual tests, if the algorithm is used to adjust the light source of a beauty instrument, in 100 adjustments, 95 times the light source energy can be stabilized within the range of ±0.5% of the target energy within 50 milliseconds, effectively improving the adjustment efficiency and accuracy.

[0008] Furthermore, when calibrating the rated power of the light source PRATED During the process, the fixed unit duration is set to 50 milliseconds; this is because after testing the response characteristics of the product light source, it was found that it can achieve 90% stable power output within 30 milliseconds, and the time for the energy detection instrument to complete a high-precision measurement is 40 milliseconds; under this time length, it can ensure that the energy change information of the light source is fully obtained in each adjustment cycle, while avoiding the impact of too frequent adjustments on the stability of the light source or too long intervals causing a decrease in calibration accuracy; in multiple calibration experiments, a fixed unit duration of 50 milliseconds was used, and the repeatability error of the calibration results was controlled within ±0.3%.

[0009] Furthermore, the switching power supply technology used in the power driver has a conversion efficiency of up to 95%; its input voltage range is 100-240VAC, and the output voltage can be precisely adjusted between 12-48VDC with an adjustment step of 0.1V; when accepting duty cycle signal adjustment, when the duty cycle changes by 1%, the output power can change by 2W within 5 milliseconds; when driving the LED light source, the duty cycle is adjusted from 50% to 51%, and the output power can be quickly increased from 100W to 102W, and during long-term operation, the stability of the output power is maintained within ±0.5%, effectively meeting the energy requirements of the light source at different working stages.

[0010] Furthermore, the display module of the product is a 3.5-inch TFT display with a resolution of 320×480 pixels; it can display the current working status information of the light source in real time, the total cumulative working time of the light source is accurate to 1 hour, the current light decay coefficient is accurate to two decimal places, the real-time duty cycle signal value is accurate to 0.1%, the light source output power is accurate to 1W, and whether the target energy output is achieved is displayed in the form of "yes" or "no" text; the user can switch the display mode through the touch button below the display screen. For example, in the chart mode, the trend of the light decay coefficient change of the light source in the past 10 hours can be displayed in the form of a line graph, thereby enhancing the user's intuitive understanding of the working conditions of the product.

[0011] Furthermore, during the normal operation of the product, if it is detected that the energy of the light source deviates from the target energy output by more than a preset threshold, an alarm mechanism is triggered; the preset threshold is set to ±3% of the target energy output; the alarm method is to emit a sound signal with a frequency of 1kHz, and the alarm indicator light on the display screen flashes red at a frequency of 2Hz; in actual applications, when the light source causes an energy drop of 4% due to unexpected circumstances, the product can respond quickly within 1 second and trigger an alarm, and record the alarm information in detail in the product's internal storage module. The record content includes the alarm time accurate to seconds, the light source energy deviation value accurate to 0.1%, etc., which is convenient for subsequent query and analysis of the cause of the fault.

[0012] Furthermore, the data communication function of the product adopts the Bluetooth 5.0 standard for wireless communication; its communication distance can reach 50 meters in an obstacle-free environment, and the maximum data transmission rate is 2Mbps; the product can send the working data of the light source, such as the light decay curve characteristic table data updated once an hour, the cumulative working time record accurate to 1 minute, and each duty cycle adjustment data accurate to 0.01%, etc. to the user's smartphone APP; users can view historical data reports through the APP, and the report is drawn with time as the horizontal axis and the light decay coefficient k, duty cycle, etc. as the vertical axis. The chart can also receive remote fault diagnosis results of the product. For example, when the light source has abnormal energy fluctuations, the APP will push the cause of the fault and suggested solutions to realize intelligent management and maintenance.

[0013] Furthermore, in terms of the hardware design of the product, a metal shielding cover with a thickness of 0.5mm is used for electromagnetic shielding of the circuit part involving light source control; the shielding effectiveness of the shielding cover can reach 60dB in the frequency range of 100MHz-1GHz; in the software design, an anti-interference algorithm based on Kalman filtering is used to process the signal received by the processor; the test is carried out in an environment with an electromagnetic interference intensity of 10V / m. After being processed by the algorithm, the bit error rate of the signal is reduced from 1% to below 0.01%, which effectively improves the stability and reliability of the system and ensures that the product can still accurately achieve constant energy output control in a complex electromagnetic environment.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The control method of the medical beauty product with constant energy output of the light source of the present invention brings about significant beneficial effects in many aspects. In terms of technical performance, the output power of the light source is dynamically adjusted by real-time calculation of the light decay coefficient of the light source and the accurately calibrated rated power, which successfully overcomes the influence of the light decay of the light source and ensures that the product can maintain a constant light source energy output throughout its life cycle. Experimental data show that in a simulated 1000-hour continuous use scenario, the fluctuation range of the light source energy output of the product using the control method of the present invention is always controlled within ±2% of the target energy, while the energy fluctuation of traditional fixed power output products can reach ±20% in the same time. This enables the product to maintain stable performance at different stages of use, greatly improving the consistency and reliability of the beauty effect.

[0015] From the perspective of user experience, users do not need to worry about the decline in beauty effects due to aging of light sources during use, reducing the cost and trouble of frequent replacement of light sources or products. For beauty institutions, it improves the service life and work efficiency of equipment, reduces the frequency of equipment maintenance and updates, and saves operating costs. In terms of market competition, the technical advantages of this invention help products stand out in the market and promote the entire light source medical beauty product industry to develop in the direction of higher performance and greater intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the fixed power output mode of existing light source products and the light decay characteristics of the light source itself.

[0017] Figure 2 This is a schematic diagram of the light decay characteristics of a light source that the present invention aims to overcome; Figure 3 This is the light decay curve characteristic table of the product with built-in light source; Figure 4 This is the principle block diagram for calibrating the rated power of the product light source. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 —4. The present invention provides a method for controlling a light source medical beauty product with constant energy output. The light source medical beauty device is mainly composed of a light source module, a power drive module, a processor, an energy detection instrument, a storage module, and a display and operation module.

[0020] The light source module uses high-quality xenon lamps or LED lamps, which have high luminous efficiency and stability in the initial state. The initial luminous flux of the LED lamp can reach 1000-1500lm, and the color temperature is between 5000-6000K, which can meet the specific spectrum and energy requirements required for medical beauty.

[0021] The power driver module uses a high-efficiency switching power supply chip, such as the LM2596 series, which can convert the input AC power into a stable DC voltage to power the light source, and receive the duty cycle signal from the processor to accurately adjust the output power. During the initialization phase, the power driver module will perform a self-check to ensure that its output voltage is within the normal range, such as between 12V-48V, and the voltage fluctuation does not exceed ±0.5V.

[0022] The processor uses a high-performance microprocessor, such as the STM32 series. At startup, the processor first initializes the internal registers, clocks, etc. to ensure that its operating frequency is stable at around 100MHz to ensure the timeliness and accuracy of data processing. At the same time, the processor communicates with the storage module to read the pre-stored light attenuation curve characteristic table and other related parameters.

[0023] The storage module uses EEPROM or Flash memory to store the light decay coefficient k of the light source at different working hours and the calibrated rated power P of the light source. RATED During the initialization process, the processor verifies the integrity and accuracy of the stored data. If the data is found to be damaged or lost, it will trigger a corresponding error prompt and try to restore the data from the backup area or default value.

[0024] Energy detection instruments use high-precision photoelectric sensors and signal conditioning circuits, such as Hamamatsu's S1226-66BQ photodiode as a light sensor, which has high sensitivity and a wide spectral response range. During initialization, the energy detection instrument will perform a calibration operation to calibrate the measurement circuit through the internal standard light source to ensure that the relative error of the measured light source energy does not exceed ±0.5%.

[0025] The display and operation module includes a display screen and operation buttons or a touch screen. The display screen can be a 3.5-inch TFT display screen with a resolution of 320×480 pixels. During initialization, it will display the product's brand logo and a startup progress bar. After initialization, it will switch to the main interface to display basic working status information of the light source, such as the current light source power, cumulative working time, etc. The operation buttons or touch screen are used by users to input operation instructions, such as start, stop, parameter setting, etc. During the initialization process, a button scan test will be performed to ensure that the button functions normally.

[0026] In order to accurately obtain the light decay curve characteristic table of the light source, a large number of experimental tests were carried out during the product development stage. In a standard laboratory environment, the temperature was strictly controlled at 25℃±2℃ and the humidity was maintained at 40%-60% to eliminate the interference of environmental factors on the test results.

[0027] At least 50 groups of light source samples with the same specifications were selected, installed on a specially designed test fixture, and connected to a stable power supply and energy detection instrument. During the test, the luminous flux and power of each sample were accurately measured every 50 hours. For LED light sources, an integrating sphere and a high-precision spectrum analyzer were used to measure the luminous flux, and a power analyzer was used to measure its power.

[0028] During the measurement process, when the measured value of the luminous flux fluctuates, the measuring equipment will be calibrated and checked to ensure the accuracy of the data. After a long period of testing, such as continuous testing for 2000 hours, a large amount of luminous flux and power data is collected. By calculating the change of the ratio of luminous flux to power over time, the light decay coefficient k under different working hours is determined.

[0029] These light decay coefficients are stored in a storage module in a certain format to form a light decay curve characteristic table. The data structure in the table can use time (hours) as the index and the light decay coefficient as the corresponding value, for example: During product use, the processor can quickly look up the corresponding light decay coefficient k from the table based on the accumulated working hours of the light source, providing a basis for subsequent power adjustment.

[0030] After the product is used for the first time or the light source is replaced, the light source rated power P RATED calibration operation.

[0031] The processor first sends an initial duty cycle signal, such as 50%, to the power driver module. The power driver module outputs the corresponding voltage and current according to the duty cycle signal to drive the light source to emit light. At the same time, the energy detection instrument starts to measure the energy output by the light source in real time.

[0032] After each adjustment of the duty cycle signal, the processor will wait for a period of time, which is set to 50 milliseconds, to ensure that the light source output reaches a stable state before energy detection. When the light source energy is detected to be greater than the target constant energy, the processor will reduce the duty cycle signal according to a certain step length, such as 1%; when the light source energy is detected to be less than the target constant energy, the processor will increase the duty cycle signal according to the same step length.

[0033] In this process, the processor uses the PID control algorithm to adjust the duty cycle signal. The parameters of the PID algorithm have been optimized through multiple experiments, and the proportional coefficient K p Set to 0.8, the integral time constant T i is 0.5 seconds, the differential time constant T d Through continuous iterative adjustment, when the light source energy is detected to be equal to the target constant energy, the duty cycle signal output by the processor is the rated power P of the product light source. RATED .

[0034] For example, during a calibration process, the target constant energy is set to 100mJ / cm². When the initial duty cycle is 50%, the light source energy is detected to be 110mJ / cm², and the processor begins to reduce the duty cycle signal. After multiple adjustments, when the duty cycle signal is adjusted to 46%, the energy detection instrument measures the light source energy to be 100mJ / cm². At this time, 46% is the calibrated light source rated power PRATED. The processor stores this value in the storage module for subsequent use when the product is working normally.

[0035] During normal operation of the product, the processor records the total cumulative working time of the light source in real time through the internal timer. The accuracy of the timer can reach 1 millisecond. Every hour, the processor will update the working time data and store it in the storage module.

[0036] At the same time, the processor will search the corresponding light decay coefficient k from the light decay curve characteristic table according to the current accumulated total working time. For example, when the accumulated working time reaches 500 hours, the corresponding light decay coefficient k is found to be 0.85 from the characteristic table.

[0037] Then, the processor outputs the real-time duty cycle signal according to the formula = (1 / k)*P RATED Calculate the new duty cycle signal. Assuming that the previously calibrated PRATED is 46%, the new duty cycle signal is (1 / 0.85)*46%≈54.12%.

[0038] The processor sends the calculated new duty cycle signal to the power driver module, which quickly adjusts the output power after receiving the signal. Its internal power regulation circuit can respond to the change of the duty cycle signal within 5 milliseconds to achieve precise regulation of the light source output power.

[0039] During the entire working process, the energy detection instrument will continuously monitor the energy of the light source. If it is detected that the light source energy deviates from the target energy output by more than a preset threshold, such as ±3%, the processor will trigger an alarm mechanism. The alarm mechanism includes emitting a sound signal with a frequency of 1kHz, and displaying a striking alarm message on the display screen, such as "Light source energy abnormality", and recording detailed alarm information in the storage module, including alarm time, light source energy deviation value, etc.

[0040] The display screen displays various working status information of the light source in real time during the operation of the product. In addition to the above-mentioned total working time of the light source, the current light decay coefficient k, the real-time duty cycle signal value and the output power of the light source, it also displays the product's working mode, current ambient temperature and humidity and other information.

[0041] Users can perform various operations through the operation buttons or touch screen. For example, users can switch the display mode of the display screen and view the precise values ​​of various parameters in the detailed data mode; in the chart mode, the display screen will display the light decay coefficient change trend of the light source over the past period of time, duty cycle adjustment history and other information in the form of a line chart or a bar chart, so that users can intuitively understand the working dynamics of the product.

[0042] Users can also set the product's operating parameters through the operation interface, such as target energy output value, working time interval, etc. During the setting process, the processor will check the legitimacy of the data entered by the user to ensure that the input value is within a reasonable range. For example, when the user sets the target energy output value, the processor will determine whether the value is within the adjustable range of the light source. If it is out of range, the user will be prompted to re-enter the value.

[0043] The product has data communication function and adopts Bluetooth 5.0 standard for wireless communication. When the product is started, the Bluetooth module will automatically initialize and pair.

[0044] The processor will regularly send the working data of the light source to the user's smartphone APP via Bluetooth. The data sent includes the light decay curve characteristic table data updated every hour, the cumulative working time record accurate to 1 minute, and the duty cycle adjustment data accurate to 0.01% each time.

[0045] After receiving the data, the smartphone APP will analyze and store the data and display it to the user in an intuitive interface. The user can view the historical data report on the APP. The report is drawn with time as the horizontal axis and the light decay coefficient k, duty cycle, etc. as the vertical axis, which is convenient for users to analyze the performance trend of the light source.

[0046] In addition, the APP also has remote monitoring and control functions. When the product encounters an abnormal situation, such as excessive fluctuations in light source energy or equipment failure, the APP will receive push notifications from the product and display detailed fault information and recommended solutions. Users can also remotely start or stop the product through the APP, adjust working parameters, etc., but during remote operation, identity verification and operation permission checks will be performed to ensure the safety and stability of the product.

[0047] In order to ensure the long-term stable operation of the product, regular maintenance of the product is necessary. During the maintenance process, the light source module is first checked to see if there is dust accumulation or physical damage. If dust is found on the surface of the light source, professional cleaning tools and methods will be used to clean it to avoid affecting the light output.

[0048] Conduct electrical performance tests on power drive modules and other electronic components, such as measuring the stability of power output voltage, checking the operating speed and data processing capabilities of the processor, etc. If a component is found to have degraded performance or malfunction, it will be replaced in a timely manner.

[0049] In terms of product upgrades, when new light decay curve characteristic data or more optimized control algorithms appear, software upgrades can be performed through the product's communication interface. During the upgrade process, the upgrade package will first be checked for integrity and legality to ensure that the upgrade process is safe and reliable. After the upgrade is completed, the product will automatically restart and perform a series of self-test operations to ensure that the upgraded system can work normally.

[0050] The control method of the present invention can be applied to various light source types, such as xenon lamps and LED lamps of different wavelengths. For xenon lamps, since their light emitting principle and light decay characteristics are different from those of LED lamps, there will be differences in the establishment of the light decay curve characteristic table and parameter settings.

[0051] When testing the light decay of xenon lamps, it is necessary to consider the impact of high voltage and high current at the moment of startup on the light decay. Through special testing equipment and methods, the luminous flux and power of xenon lamps at different working hours are measured to establish the corresponding light decay curve characteristic table. In the control process, according to the characteristics of xenon lamps, the control parameters of the processor and the output characteristics of the power drive module are adjusted to achieve constant energy output.

[0052] For LED lights with different wavelengths, such as blue LEDs for skin whitening and red LEDs for promoting collagen production, their light decay speed and energy requirements are also different. In practical applications, light decay curve characteristic tables are established for LED lights with different wavelengths, and appropriate target energy output values ​​and control parameters are set according to their specific application requirements in medical cosmetology to ensure that each LED light can achieve stable constant energy output throughout its life cycle and achieve the expected beauty effect.

[0053] The following is the calibration method for the rated power PRATED of the light source when the light source has the target energy output: Beauty instrument using xenon lamp as light source A medical beauty instrument uses a common xenon lamp as the light source. Its energy detection instrument uses a high-precision spectrum energy analyzer, which can accurately measure the light energy output of the xenon lamp under different working conditions, with a measurement accuracy of ±0.3%. The processor uses an ARM core microprocessor with fast data processing capabilities, which can quickly respond to and process feedback signals from the energy detection instrument and accurately adjust the duty cycle signal.

[0054] The target constant energy is set at 80mJ / cm², which is determined based on clinical research and experimental data of this beauty instrument for specific beauty projects. It can achieve ideal beauty effects while ensuring safety.

[0055] The processor first outputs an initial duty cycle signal of 40%. The power driver module provides the corresponding driving voltage and current to the xenon lamp according to the duty cycle signal, so that the xenon lamp starts to emit light. The energy detection instrument immediately measures the light energy of the xenon lamp. In this process, it is found that the initial measured light energy is 70mJ / cm², which is lower than the target energy.

[0056] The processor increases the duty cycle signal in 2% steps based on the feedback from the energy detection instrument. When the duty cycle signal increases to 44%, the energy detection instrument measures the light energy to be 82mJ / cm², which exceeds the target energy.

[0057] The processor uses a PID control algorithm for fine adjustment. After multiple iterations, when the duty cycle signal is adjusted to 43%, the energy detection instrument accurately measures the light energy to be 80mJ / cm². At this point, the processor determines that 43% is the light source rated power PRATED when the xenon lamp reaches the target energy output under the experimental conditions, and stores it in the internal storage chip of the beauty instrument for subsequent use.

[0058] Skin treatment equipment with multi-wavelength LED light source For a skin treatment device that uses multi-wavelength LED light sources including red light 630nm, blue light 470nm and near-infrared light 850nm, its energy detection instrument uses a sensor array specifically for measuring the energy of light of different wavelengths, which can accurately measure the energy output of each wavelength of light at the same time, and the measurement accuracy at each wavelength can reach ±0.4%. The processor uses a high-performance DSP processor with powerful parallel processing capabilities, which can quickly process energy data and duty cycle adjustment tasks for multiple wavelengths of light.

[0059] Different target constant energies are set for light of different wavelengths: 60mJ / cm² for red light, 50mJ / cm² for blue light, and 70mJ / cm² for near-infrared light. These values ​​are determined based on the different mechanisms of action of light of different wavelengths on skin tissue and a large number of clinical experimental results, and aim to achieve a comprehensive therapeutic effect on the skin.

[0060] For the red LED light source, the processor first sets the initial duty cycle signal to 35%. After the power driver module drives the red LED to emit light, the energy detection instrument measures its initial light energy as 50mJ / cm². The processor increases the duty cycle signal in steps of 1.5%. When the duty cycle reaches 42%, the light energy reaches 62mJ / cm². Then, the PID control algorithm is used for further adjustment. Finally, when the duty cycle is 41%, the light energy stabilizes at 60mJ / cm², and the rated power PRATED of the red LED light source is determined to be 41%.

[0061] For the blue LED light source, the initial duty cycle is set to 40%, and the initial measured light energy is 40mJ / cm². The processor increases the duty cycle by 2% steps, and when it reaches 50%, the light energy is 53mJ / cm². After PID adjustment, when the duty cycle is 48%, the light energy reaches 50mJ / cm², and the rated power PRATED of the blue LED light source is determined to be 48%.

[0062] For the near-infrared LED light source, the initial duty cycle is 30% and the initial light energy is 60mJ / cm². Since the initial light energy is close to the target energy, the processor fine-tunes the duty cycle in 1% steps. When the duty cycle is adjusted to 33%, the light energy stabilizes at 70mJ / cm², and the rated power PRATED of the near-infrared LED light source is determined to be 33%. The processor stores the rated power values ​​of these different wavelength LED light sources in the device's storage unit, and establishes corresponding index relationships so that they can be quickly called and switched according to different treatment modes during the operation of the device.

[0063] In terms of temperature adaptability testing, the product was placed in a high and low temperature test chamber and tested for a long time at different temperatures such as -20℃, 0℃, 25℃, 40℃, and 60℃. The test time at each temperature point was no less than 24 hours. During the test, the product's light source output energy, duty cycle adjustment accuracy, working status of electronic components and other parameters were monitored. Through testing, it was found that within the temperature range of -20℃ to 60℃, the product's various performance indicators can meet the design requirements, the light source energy output fluctuation can still be controlled within ±5% of the target energy, and the duty cycle adjustment accuracy is maintained within ±1%.

[0064] In the humidity adaptability test, the product was placed in an environment with a humidity of 20%, 40%, 60%, 80%, and 95%, and the test time at each humidity point was no less than 24 hours. The test results showed that the product could work normally in an environment with a humidity of 20%-95%, without problems such as short circuit, corrosion, or performance degradation caused by humidity.

[0065] In terms of reliability testing, the accelerated life test method is used to conduct continuous and uninterrupted working tests on the product to simulate the long-term operation of the product in actual use. After an accelerated test equivalent to a 5-year service life, the product is comprehensively evaluated for performance and disassembled for inspection. The results show that the failure rate of the product's main electronic components, such as processors and power driver chips, is less than 1%, and the light decay of the light source is still within an acceptable range. The overall reliability of the product is high and can meet the long-term use needs of the market.

[0066] In actual medical beauty scenarios, the light source medical beauty products of the present invention may need to work in conjunction with other devices, such as radio frequency beauty devices, microneedle introduction devices, etc.

[0067] In terms of hardware connection, the product has reserved standard communication interfaces, such as USB or RS232, to facilitate data transmission and control signal interaction with other devices. At the software level, corresponding collaborative work protocols and control algorithms have been developed to achieve synchronous work and information sharing between different devices.

[0068] When working with a radio frequency beauty instrument, light source products can dynamically adjust their own light source energy output according to the working mode and energy output of the radio frequency beauty instrument. When the radio frequency beauty instrument is heating the deep skin, light source products can appropriately reduce the light energy output to avoid excessive stimulation to the skin; and when the radio frequency beauty instrument is in an intermittent period, light source products can increase the light energy output to enhance the beauty effect. Through this collaborative working mode, it can provide users with more comprehensive and personalized medical beauty solutions and improve the effect and safety of beauty treatments.

Claims

1. A control method for a medical beauty product with a constant energy output light source, characterized in that: The product pre-stores a light decay curve characteristic table of the light source at different working hours, which is used to obtain the light decay coefficient k corresponding to the light source at each working stage. The light decay coefficient k represents the relationship between the output luminous flux of the light source at unit power and the working time; There is a calibrated initial product with a light source rated power P when the light source target energy output is reached. RATED The steps specifically include: using a processor to output different duty cycle signals to a power driver according to a fixed unit time, the power driver supplies power to the light source, and at the same time detecting the energy of the light source through an energy detection instrument; when it is detected that the energy of the light source is greater than the target constant energy, the processor reduces the duty cycle signal; when it is detected that the energy of the light source is less than the target constant energy, the processor increases the duty cycle signal; until it is detected that the energy of the light source is equal to the target constant energy, at this time the duty cycle signal output by the processor is determined as the rated power P of the product light source RATED , and the processor saves the value; During the normal operation of the product, the total accumulated working time of the light source is recorded in real time, and the light decay coefficient k corresponding to the current total working time is found according to the light decay curve characteristic table; According to the obtained light attenuation coefficient k and the calibrated light source rated power P RATED , calculate the new duty cycle signal in real time according to the formula, that is, the real-time duty cycle signal output = (1 / k) * P RATED By adjusting the duty cycle signal, the power driver is controlled to change the output power of the light source, thereby ensuring that the target light source energy output is maintained throughout the product life cycle, where the light source output power is positively correlated with the duty cycle signal size.

2. The control method of a medical beauty product with a light source having a constant energy output according to claim 1, characterized in that: The light decay curve characteristic table is obtained as follows: in a standard laboratory environment, the temperature is maintained at 25°C ± 2°C, and the humidity is controlled at 40%-60%; at least 10 groups of the same light source medical beauty product samples are used, and the luminous flux and power of each sample are measured every 100 hours, and the test is continued for 1000 hours; the light decay coefficient k is determined by accurately calculating the change in the ratio of luminous flux to power, and a light decay curve characteristic table is formed after statistical analysis; for example, when testing xenon lamp samples, it is found that the light decay coefficient is approximately 0.85 when the working time is 500 hours. The data will be accurately recorded in the characteristic table, and this table is stored in the internal Flash memory of the product to ensure stable reading.

3. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: The accuracy requirements of the energy detection instrument are extremely strict; the relative error of measuring the energy of the light source shall not exceed ±0.5%; the instrument adopts a high-precision photodiode as a light sensor, and its response wavelength range covers the main luminous band of the product light source, such as the common LED beauty light source, the wavelength covers 400-700nm; the instrument is equipped with a high-precision A / D conversion module with a resolution of 16 bits, which can accurately convert the light signal into a digital signal for processing, and automatically calibrates once every 100 hours of work, using a standard light source for comparison and adjustment to ensure long-term measurement accuracy and stability.

4. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: The processor uses a PID control algorithm when adjusting the duty cycle signal; the proportional coefficient K of the algorithm p Set to 0.8, the integral time constant T i is 0.5 seconds, the differential time constant T d 0.1 second; when the deviation between the light source energy fed back by the energy detection instrument and the target energy is within 1%, the algorithm can quickly calculate the duty cycle adjustment within 10 milliseconds and complete the output adjustment of the duty cycle signal within 50 milliseconds; In actual tests, when the algorithm is used to adjust the light source of a beauty instrument, in 100 adjustments, 95 times the light source energy can be stabilized within ±0.5% of the target energy within 50 milliseconds, effectively improving the adjustment efficiency and accuracy.

5. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: At the rated power P of the calibrated light source RATED During the process, the fixed unit duration is set to 50 milliseconds; this is because after testing the response characteristics of the product light source, it was found that it can achieve 90% stable power output within 30 milliseconds, and the time for the energy detection instrument to complete a high-precision measurement is 40 milliseconds; under this time length, it can ensure that the energy change information of the light source is fully obtained in each adjustment cycle, while avoiding the impact of too frequent adjustments on the stability of the light source or too long intervals causing a decrease in calibration accuracy; in multiple calibration experiments, a fixed unit duration of 50 milliseconds was used, and the repeatability error of the calibration results was controlled within ±0.3%.

6. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: The switching power supply technology used in the power driver has a conversion efficiency of up to 95%; its input voltage range is 100-240VAC, and the output voltage can be accurately adjusted between 12-48VDC with an adjustment step of 0.1V; when receiving duty cycle signal adjustment, when the duty cycle changes by 1%, the output power can change by 2W within 5 milliseconds; When driving the LED light source, the duty cycle is adjusted from 50% to 51%, and the output power can be quickly increased from 100W to 102W. In the long-term working process, the stability of the output power is maintained within ±0.5%, effectively meeting the energy requirements of the light source in different working stages.

7. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: The display module of the product is a 3.5-inch TFT display with a resolution of 320×480 pixels; it can display the current working status information of the light source in real time, the total cumulative working time of the light source is accurate to 1 hour, the current light decay coefficient is accurate to two decimal places, the real-time duty cycle signal value is accurate to 0.1%, the light source output power is accurate to 1W, and whether the target energy output is achieved is displayed in the form of "yes" or "no"; Users can switch display modes through the touch buttons below the display screen. For example, in chart mode, the light decay coefficient change trend of the light source in the past 10 hours can be displayed in the form of a line graph, enhancing the user's intuitive understanding of the product's working conditions.

8. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: During normal operation of the product, if it is detected that the energy of the light source deviates from the target energy output by more than the preset threshold, the alarm mechanism is triggered; the preset threshold is set to ±3% of the target energy output; the alarm method is to emit a sound signal with a frequency of 1kHz, and the alarm indicator on the display screen flashes red at a frequency of 2Hz; in actual application, when the energy of the light source drops by 4% due to unexpected circumstances, the product can respond quickly within 1 second and trigger an alarm, and the alarm information is recorded in detail in the internal storage module of the product. The record content includes the alarm time accurate to seconds, the light source energy deviation value accurate to 0.1%, etc., which is convenient for subsequent query and analysis of the cause of the fault.

9. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: The data communication function of the product adopts Bluetooth 5.0 standard for wireless communication; its communication distance can reach 50 meters in an obstacle-free environment, and the maximum data transmission rate is 2Mbps; the product can send the working data of the light source, such as the light decay curve characteristic table data updated once an hour, the cumulative working time record accurate to 1 minute, and the duty cycle adjustment data each time accurate to 0.01%, etc. to the user's smartphone APP; users can view historical data reports through the APP, and the report is drawn with time as the horizontal axis and the light decay coefficient k, duty cycle, etc. as the vertical axis. The product can also receive remote fault diagnosis results of the product. For example, when the light source has abnormal energy fluctuations, the APP will push the cause of the fault and suggested solutions to realize intelligent management and maintenance.

10. The control method of a medical beauty product with a constant energy output light source according to claim 1, characterized in that: In terms of the hardware design of the product, a 0.5mm thick metal shielding cover is used for electromagnetic shielding of the circuit part involving light source control; the shielding effectiveness of the shielding cover can reach 60dB in the frequency range of 100MHz-1GHz; in the software design, an anti-interference algorithm based on Kalman filtering is used to process the signal received by the processor; the test is carried out in an environment with an electromagnetic interference intensity of 10V / m. After being processed by the algorithm, the bit error rate of the signal is reduced from 1% to below 0.01%, which effectively improves the stability and reliability of the system and ensures that the product can still accurately achieve constant energy output control in a complex electromagnetic environment.

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