LED and ozone integrated fresh-keeping control system and method for refrigerator

Abstract

The invention provides an LED and ozone integrated fresh-keeping control system and method for a refrigerator, and the system comprises an ultraviolet radiation control module which is used for controlling the on or off of an ultraviolet lamp; the ozone generating and monitoring module is used for generating and monitoring ozone concentration; the gravity sensor is arranged in the vegetable storage area of the refrigerating chamber and used for detecting the article placement state; the MCU control module is used for controlling starting of ultraviolet radiation and generation of ozone according to the weight of an article, the ozone concentration is monitored in real time through the MQ131 sensor, the MCU dynamically controls starting and stopping of the ozone generator according to feedback of the sensor, and closed-loop control is formed. The ozone concentration is monitored, self-adaptive control is realized, the ozone generator is controlled by an MOS tube, excessive accumulation of ozone is avoided, power consumption is reduced, intelligent regulation and control of the ozone concentration are realized through a closed-loop link, and the ozone control system is superior to a traditional ozone control scheme in the aspects of accuracy, safety and user experience. And an upgrading path with high cost performance is provided for a household refrigerator fresh-keeping technology.

Description

Technical Field

[0001] This application relates to the technical field of household appliances, and more specifically to a fresh-keeping control system and method integrating LED and ozone for a refrigerator. Background Art

[0002] A refrigerator is a key appliance for storing food in modern families, and its lighting system affects the convenience of retrieving items and food preservation. Traditional lighting such as incandescent lamps and fluorescent lamps has problems such as low efficiency, while LEDs have become the mainstream due to their energy saving, environmental protection, and long lifespan. LEDs provide uniform light, which helps reduce temperature fluctuations and is beneficial for preservation. Therefore, developing intelligent and efficient LED lighting preservation technology is crucial for improving the performance of refrigerators and meeting consumer needs.

[0003] Refrigerator LED lighting technology has mainly made progress in energy saving and intelligent control. In terms of energy saving, by using high-efficiency LED chips, optimizing circuit design, and integrating intelligent dimming functions, energy consumption is reduced, battery life is extended, heat generation is reduced, and the energy efficiency of the refrigerator is improved. In terms of intelligent control, high-end refrigerators automatically adjust the LED brightness through human body and light sensors to achieve intelligent control and save energy. Some refrigerators also attempt to combine LED lighting with preservation technology, such as using specific wavelength LED light to inhibit bacterial growth and promote the preservation of fruits and vegetables.

[0004] Despite the progress of refrigerator LED lighting technology, the integration with preservation technology is insufficient. When the refrigerator door is closed, the LED goes out, losing the opportunity for preservation; when it is opened, there is a lack of customized lighting solutions for different ingredients, and the best preservation effect cannot be achieved. Therefore, optimizing the design of the LED lighting system to achieve intelligent and personalized fresh-keeping lighting control is an important challenge at present. Summary of the Invention

[0005] To solve the above problems where the LED goes out after the refrigerator door is closed, losing the opportunity for preservation; and when it is opened, there is a lack of customized lighting solutions for different ingredients, and the best preservation effect cannot be achieved.

[0006] The first aspect of this application provides a fresh-keeping control system integrating LED and ozone for a refrigerator, including: an ultraviolet irradiation control module, an ozone generation and monitoring module, a gravity sensor, and an MCU control module, where the ultraviolet irradiation control module and the ozone generation module are integrated on the same circuit board;

[0007] The ultraviolet irradiation control module is used to control the turning on or off of ultraviolet irradiation and adjust the ultraviolet irradiation intensity;

[0008] The ozone generation and monitoring module is used to control the generation or stop of ozone, monitor the ozone concentration, and generate an ozone concentration signal to be sent to the MCU control module;

[0009] The gravity sensor is arranged in the vegetable storage area of the refrigerating chamber, and is used to detect the placement state of items. When the trigger threshold is reached, a trigger signal is generated and sent to the MCU control module;

[0010] The MCU control module is electrically connected to the ultraviolet irradiation control module, the ozone generation and monitoring module, and the gravity sensor respectively;

[0011] The MCU control module is configured as:

[0012] Receiving the trigger signal from the gravity sensor, and controlling the ultraviolet irradiation control module to turn on the ultraviolet irradiation according to the trigger signal, and controlling the ozone generation and monitoring module to generate ozone, and turning off the ultraviolet irradiation and ozone generation functions after the preset preservation period ends;

[0013] Receiving the ozone concentration signal from the ozone generation and monitoring module, and controlling the ozone generation and monitoring module to generate ozone or stop generating ozone according to the ozone concentration value.

[0014] In a feasible implementation manner, the ultraviolet irradiation control module includes: a V-I conversion circuit and a UVC-LED;

[0015] The UVC-LED is used to generate ultraviolet irradiation, and the parameters of the UVC-LED include: peak wavelength 270 - 280 nm, radiation power 4 - 20 mW, and working current 20 - 140 mA;

[0016] The V-I conversion circuit is electrically connected to the UVC-LED, and the V-I conversion circuit is implemented based on a digital potentiometer, and is used to control the working current of the UVC-LED by adjusting the input voltage;

[0017] When the refrigerator door is opened, the MCU control module automatically controls the ultraviolet irradiation control module to switch the UVC-LED to the on state.

[0018] In a feasible implementation manner, the ozone generation and monitoring module includes: an ozone generator, an ozone sensor, and a MOS tube drive circuit;

[0019] The ozone generator is used to generate ozone, and the ozone sensor is used to monitor the ozone concentration and generate an ozone concentration signal and send it to the MCU control module;

[0020] The ozone sensor is an MQ131 type gas sensor, and its gas-sensitive resistance value is inversely proportional to the ozone concentration;

[0021] The MOS transistor drive circuit is electrically connected to the ozone generator, and the MOS transistor drive circuit is used to dynamically adjust the output power of the ozone generator through a PWM signal.

[0022] In a feasible implementation manner, the MCU control module incorporates a hysteresis control algorithm;

[0023] The MCU control module is further configured as:

[0024] When it is detected that the ozone concentration > 6 ppm, the MCU control module controls the ozone generation and monitoring module to shut down the ozone generator. When it is detected that the ozone concentration < 4 ppm, the MCU control module controls the ozone generation and monitoring module to restart the ozone generator.

[0025] In a feasible implementation manner, the trigger threshold of the gravity sensor is 50 - 200 g.

[0026] The second aspect of the present application provides a fresh-keeping control method for an integrated LED and ozone in a refrigerator, which is applied to the fresh-keeping control system for an integrated LED and ozone in a refrigerator as described in any one of the above, and includes steps:

[0027] Detect the weight change in the vegetable storage area of the refrigerator compartment through the gravity sensor, generate a weight signal and send it to the MCU control module;

[0028] When the MCU control module detects that the weight exceeds the threshold, activate the ultraviolet irradiation control module to turn on and adjust the ultraviolet irradiation, and activate the ozone generation module to generate ozone;

[0029] Real-time monitor the concentration value of ozone through the ozone generation module, generate an ozone concentration signal and send it to the MCU control module;

[0030] The MCU control module controls the ozone generation module to generate ozone or stop generating ozone according to the deviation between the ozone concentration signal and a preset threshold;

[0031] The MCU control module turns off the ultraviolet irradiation and ozone generation functions after the preset fresh-keeping period ends.

[0032] In a feasible implementation manner, the step of controlling according to the deviation between the ozone concentration signal and the preset threshold includes:

[0033] When the real-time ozone concentration > 6 ppm, the MCU control module sends a stop generation instruction to the ozone generation module;

[0034] When the real-time ozone concentration < 4 ppm, the MCU control module sends a start generation instruction to the ozone generation module;

[0035] Maintain the current working state of the ozone generation module within the concentration range of 4 - 6 ppm.

[0036] In a feasible implementation manner, the step of adjusting the ultraviolet irradiation includes:

[0037] Gradually increase the working current of the UVC - LED through a digital potentiometer until the target radiation power is reached;

[0038] Match the ultraviolet irradiation parameters according to the preset vegetable type, and the parameters include irradiation duration and radiation power level.

[0039] In a feasible implementation manner, it further includes a safety control step:

[0040] When the ozone concentration signal indicates that the concentration exceeds 8 ppm and lasts for 30 minutes, control the ozone generation module to stop generating ozone and turn off the ultraviolet irradiation control module.

[0041] In a feasible implementation manner, the preset preservation period is dynamically adjusted according to the weight signal of the gravity sensor. The larger the weight value detected by the gravity sensor, the longer the preset preservation period.

[0042] As can be seen from the above, this application provides a fresh - keeping control system and method for an integrated LED and ozone in a refrigerator. The ozone concentration is monitored in real - time through an MQ131 sensor, and the MCU dynamically controls the start and stop of the ozone generator according to the sensor feedback to form a closed - loop control. It breaks through the limitations of traditional open - loop control and realizes precise adjustment. At the same time, it monitors the ozone concentration to achieve adaptive control of the environment response, which not only meets the high - precision analog quantity acquisition requirements but also supports the threshold alarm function. The MOS tube controls the ozone generator to replace the mechanical relay, which has the characteristics of no spark and high - frequency switching, and reduces power consumption while avoiding excessive ozone accumulation. The intelligent regulation of the ozone concentration is realized through a closed - loop link. Combining low - cost hardware and software algorithm optimization, it is significantly superior to the traditional ozone control scheme in terms of accuracy, safety, and user experience, providing a cost - effective upgrade path for the fresh - keeping technology of household refrigerators. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments that comply with the implementation of the present invention, and are used together with the specification to explain the principles of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the implementation of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic structural diagram of the fresh - keeping control system for an integrated LED and ozone in a refrigerator shown in the embodiments of this application;

[0045] Figure 2 is the circuit schematic diagram of the ultraviolet irradiation control module designed based on AD5161 shown in the embodiments of the present application;

[0046] Figure 3 is the schematic flow chart of the fresh-keeping control method for the integrated LED and ozone in the refrigerator shown in the embodiments of the present application. Detailed Embodiments

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more complete and thorough, and will fully convey the concept of the example embodiments to those skilled in the art. The features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention.

[0048] Existing refrigerators have combined LED lighting with preservation technology, such as using LED light of a specific wavelength to inhibit the growth of bacteria and promote the preservation of fruits and vegetables, but the integration with preservation technology is insufficient. When the refrigerator door is closed, the LED goes out, losing the opportunity for preservation; while when it is opened, there is a lack of customized lighting solutions for different ingredients, and the best preservation effect cannot be achieved.

[0049] To solve the above problems, in the first aspect of the embodiments of the present application, a fresh-keeping device system integrating an LED and an ozone generator for a refrigerator is proposed. The system is integrally arranged in the vegetable fresh-keeping placement area of the refrigerator freezer compartment. Referring to Figure 1 as shown, it mainly includes an ultraviolet irradiation control module, an ozone generation and monitoring module, a gravity sensor, and an MCU control module. Among them, the ultraviolet irradiation control module and the ozone generation module are integrated on the same circuit board to improve the integration and stability of the system.

[0050] The ultraviolet irradiation control module is mainly used to control the turning on or off of ultraviolet irradiation and adjust the ultraviolet irradiation intensity, providing suitable photosynthesis conditions for vegetables, promoting the photosynthesis of vegetables, and at the same time inhibiting the growth and reproduction of microorganisms on the surface of fruits and vegetables, and extending the post-harvest life.

[0051] The ozone generation and monitoring module is used to control the generation or stop of ozone and monitor the ozone concentration. Ozone can effectively kill microorganisms such as bacteria, fungi, and viruses, keep the freshness of vegetables and extend the shelf life. At the same time, real-time monitoring of the ozone concentration can ensure that the ozone concentration is stable within the optimal sterilization range and avoid being harmful to the human body.

[0052] The gravity sensor is set in the vegetable storage area of the refrigerating chamber to detect the placement state of items. When the trigger threshold is reached, the gravity sensor generates a trigger signal and sends the trigger signal to the MCU control module. As the trigger device of the system, the gravity sensor only activates the preservation measures when vegetables are placed in the preservation area, avoiding unnecessary energy consumption.

[0053] The MCU control module is electrically connected to the ultraviolet irradiation control module, the ozone generation and monitoring module, and the gravity sensor respectively. It receives the trigger signal from the gravity sensor and controls the ultraviolet irradiation control module to turn on the ultraviolet irradiation and the ozone generation and monitoring module to generate ozone according to the trigger signal. At the same time, the MCU control module also receives the ozone concentration signal from the ozone generation and monitoring module and controls the ozone generation and monitoring module to generate ozone or stop generating ozone according to the ozone concentration value.

[0054] The MCU control module intelligently controls the working states of the ultraviolet irradiation control module and the ozone generation and monitoring module according to the signals of the gravity sensor and the ozone sensor, realizing the automatic and intelligent control of the system.

[0055] The fresh-keeping control system integrating LED and ozone for the refrigerator provided in this embodiment realizes the intelligent fresh-keeping control in the vegetable fresh-keeping placement area of the refrigerator's refrigerating chamber by integrating the ultraviolet irradiation control module, the ozone generation and monitoring module, the gravity sensor, and the MCU control module. When vegetables are placed in the fresh-keeping area, the gravity sensor outputs a trigger signal. After receiving the trigger signal, the MCU control module controls the ultraviolet irradiation control module to turn on the ultraviolet irradiation and controls the ozone generation and monitoring module to generate ozone. At the same time, the ozone sensor monitors the ozone concentration in real time and transmits the concentration signal to the MCU control module. The MCU control module controls the ozone generation and monitoring module to generate ozone or stop generating ozone according to the deviation between the ozone concentration signal and the preset threshold. The whole system improves the fresh-keeping effect and reduces the energy consumption through intelligent control and integrated design.

[0056] In some embodiments of the present application, the ultraviolet irradiation control module includes a V-I conversion circuit and a UVC-LED. Among them, the UVC-LED is used to generate ultraviolet irradiation, and its parameters include a peak wavelength of 270 - 280 nm, a radiation power of 4 - 20 mW, and a working current of 20 - 140 mA. The V-I conversion circuit is electrically connected to the UVC-LED and is used to control the working current of the UVC-LED by adjusting the input voltage, thereby realizing the adjustment of the ultraviolet irradiation intensity.

[0057] The V-I conversion circuit is based on a digital potentiometer. The digital potentiometer is a programmable resistor device whose resistance value can be adjusted through digital signals. Specifically, referring to Figure 2 as shown, Figure 2It is the circuit schematic diagram of the ultraviolet irradiation control module designed based on the AD5161. The AD5161 is a 256-bit digital potentiometer. It can be understood that this solution is not limited to being based on the AD5161, and the adjustment function can also be achieved by using other digital potentiometers. In this embodiment, the V-I conversion circuit changes the input voltage by adjusting the resistance value of the digital potentiometer, thereby adjusting the working current of the UVC-LED. The UVC-LED can emit ultraviolet rays of a specific wavelength under the drive of an electrical signal, providing suitable photosynthesis conditions for vegetables and promoting the photosynthesis of vegetables.

[0058] Therefore, in this embodiment, the precise adjustment of the ultraviolet irradiation intensity is achieved through the V-I conversion circuit. Ultraviolet irradiation of an appropriate wavelength can inhibit the growth and reproduction of microorganisms on the surface of fruits and vegetables and extend the post-harvest life. By adjusting the ultraviolet irradiation intensity, the preservation effect can be further improved. And different types of vegetables have different requirements for the ultraviolet irradiation intensity, and the preservation needs of different vegetables can be met by adjusting the ultraviolet irradiation intensity.

[0059] The MCU control module automatically controls the ultraviolet irradiation control module to switch the UVC-LED to the on state when the refrigerator door is opened. When the refrigerator door is opened, the MCU control module detects the door open signal and automatically sends a control instruction to the ultraviolet irradiation control module to make the UVC-LED in the on state. This design can facilitate users to observe the preservation status of vegetables when the refrigerator door is opened. At the same time, it can also automatically start the ultraviolet irradiation control module when the refrigerator door is opened to perform ultraviolet irradiation treatment on vegetables.

[0060] The ultraviolet irradiation control module of this embodiment realizes the precise adjustment of the ultraviolet irradiation intensity by integrating the V-I conversion circuit and the UVC-LED. The V-I conversion circuit is based on a digital potentiometer and precisely adjusts the ultraviolet irradiation intensity by adjusting the resistance value of the digital potentiometer. The MCU control module automatically controls the ultraviolet irradiation control module to switch the UVC-LED to the on state when the refrigerator door is opened, facilitating users to observe the preservation status of vegetables. The entire ultraviolet irradiation control module can meet the preservation needs of different vegetables, improve the preservation effect, extend the post-harvest life, and provide a better user experience for users.

[0061] In some embodiments of this application, the ozone generation and monitoring module includes an ozone generator, an ozone sensor, and an MOS tube drive circuit. Among them, the ozone generator is used to generate ozone, the ozone sensor is used to monitor the ozone concentration and generate an ozone concentration signal to send to the MCU control module, and the MOS tube drive circuit is used to dynamically adjust the output power of the ozone generator through a PWM signal.

[0062] Specifically, in this embodiment, the MQ131 gas sensor is selected as the ozone sensor. The MQ131 sensor is a high-precision and high-stability ozone sensor. The MQ131 sensor is based on the metal oxide semiconductor (MOS) principle. When ozone gas adsorbs on the sensor surface, it will react with the metal oxide inside the sensor, resulting in a change in the resistance value of the sensor. By measuring the change in the resistance value, the ozone concentration can be indirectly measured. And its gas-sensitive resistance value is inversely proportional to the ozone concentration. When the ozone concentration increases, the gas-sensitive resistance value decreases; when the ozone concentration decreases, the gas-sensitive resistance value increases.

[0063] The MQ131 sensor has 4 pins, namely VCC, GND, AOUT, and DOUT. During actual operation, the tube drive circuit controls the start and stop of the ozone generator through MOS transistors to control the gas concentration of ozone sterilization. The gas-sensitive resistance value in the MQ131 is inversely proportional to the ozone concentration value in the environment. The ozone sensor converts the gas-sensitive resistance value into a voltage signal and transmits it to the MOS transistor drive circuit through the analog output pin. The MOS transistor drive circuit then converts the voltage value into an ozone concentration value and uploads it to the upper computer software on the PC side through the serial port, so as to monitor the ozone concentration in real time.

[0064] The MOS transistor drive circuit is electrically connected to the ozone generator and is used to dynamically adjust the output power of the ozone generator through a PWM signal. The PWM signal is a pulse width modulation signal. By adjusting the pulse width, the duty cycle of the output signal can be changed, thereby adjusting the output power of the ozone generator.

[0065] After the ozone generation and monitoring module is started, the ozone generator generates ozone gas under the control of an electrical signal. Ozone gas has strong oxidizing properties and can kill microorganisms such as bacteria, fungi, and viruses, maintaining the freshness of vegetables and extending the shelf life.

[0066] The ozone sensor monitors the ozone concentration in real time and converts the concentration signal into an electrical signal and transmits it to the MCU control module. The MCU control module adjusts the ozone concentration by controlling the power on and off of the ozone generator according to the preset ozone concentration threshold. By monitoring the ozone concentration in real time, it can ensure that the ozone concentration is stable within the optimal sterilization range and avoid harm to the human body.

[0067] The MOS transistor drive circuit dynamically adjusts the output power of the ozone generator through a PWM signal, which can adjust the output power of the ozone generator according to actual needs, improving the flexibility and controllability of the system.

[0068] The ozone generation and monitoring module of this embodiment integrates an ozone generator, an ozone sensor, and an MOS transistor drive circuit to achieve real-time monitoring and dynamic adjustment of ozone concentration. The ozone generator generates ozone gas under the control of an electrical signal to kill microorganisms and maintain the freshness of vegetables. The ozone sensor monitors the ozone concentration in real time and transmits the concentration signal to the MCU control module. The MCU control module adjusts the ozone concentration by controlling the power on and off of the ozone generator according to a preset ozone concentration threshold. The MOS transistor drive circuit dynamically adjusts the output power of the ozone generator through a PWM signal to improve the flexibility and controllability of the system. The entire ozone generation and monitoring module improves the preservation effect and protects human health by monitoring and dynamically adjusting the ozone concentration in real time.

[0069] In some embodiments of this application, the MCU control module incorporates a hysteresis control algorithm for controlling the ozone generation and monitoring module to generate ozone or stop generating ozone according to the ozone concentration signal. The hysteresis control algorithm is a control algorithm with hysteresis characteristics. When the input signal exceeds a preset threshold, the output signal will undergo a jump, and only when the input signal is lower than another preset threshold will the output signal jump again.

[0070] In this embodiment, the specific control logic of the hysteresis control algorithm is as follows:

[0071] When the monitored ozone concentration > 6 ppm, the MCU control module sends a stop generation instruction to the ozone generation and monitoring module to control the ozone generator to stop generating ozone.

[0072] When the monitored ozone concentration < 4 ppm, the MCU control module sends a start generation instruction to the ozone generation and monitoring module to control the ozone generator to restart generating ozone.

[0073] In the concentration range of 4 - 6 ppm, the MCU control module maintains the current working state of the ozone generation and monitoring module, that is, if the ozone generator is generating ozone, it continues to generate ozone; if the ozone generator has stopped generating ozone, it remains in the stopped state.

[0074] The hysteresis control algorithm can automatically control the start and stop of the ozone generator according to the ozone concentration signal, stabilize the ozone concentration within the optimal sterilization range (4 - 6 ppm), and improve the preservation effect. At the same time, the hysteresis control algorithm has hysteresis characteristics, which can avoid frequent start and stop of the ozone generator and extend the service life of the ozone generator. Different thresholds can be set according to actual needs during actual application to improve the control accuracy and flexibility. The solution of this embodiment stabilizes the ozone concentration through the hysteresis control algorithm, improves the preservation effect, avoids frequent start and stop, extends the service life, and improves the stability and reliability of the system.

[0075] In some embodiments of the present application, a gravity sensor is disposed in the vegetable storage area of the refrigerating chamber for detecting the placement state of an item. When the trigger threshold is reached, the gravity sensor generates a trigger signal and sends the trigger signal to the MCU control module. In this embodiment, the trigger threshold of the gravity sensor is set to 50 - 200 g.

[0076] It can be understood that by setting the trigger threshold to 50 - 200 g, false triggering caused by slight vibration or accidental touch can be avoided, improving the stability and reliability of the system. Moreover, different types of vegetables have different weights. Setting the trigger threshold to 50 - 200 g can adapt to the placement requirements of different vegetables, improving the flexibility and applicability of the system.

[0077] Meanwhile, the gravity sensor is disposed in the vegetable storage area of the refrigerating chamber, such that only when vegetables are placed in the preservation area, the gravity sensor outputs a trigger signal to activate the preservation measures, which can avoid unnecessary energy consumption.

[0078] Another aspect of the embodiments of the present application provides a preservation control method for an integrated LED and ozone in a refrigerator, which is applied to the embodiments of the above-mentioned preservation control system for an integrated LED and ozone in a refrigerator. Referring to Figure 3 As shown, the method includes the following steps:

[0079] S100: The gravity sensor monitors the weight change in the vegetable storage area of the refrigerating chamber in real time. When a weight change is detected, a weight signal is generated and sent to the MCU control module.

[0080] By detecting the weight change in the vegetable storage area of the refrigerating chamber through the gravity sensor, it can be determined whether vegetables are placed in the preservation area, thereby deciding whether to activate the preservation measures.

[0081] S200: After receiving the weight signal, the MCU control module determines whether the weight exceeds a preset threshold. If it exceeds the preset threshold, an opening instruction is sent to the ultraviolet irradiation control module, and the ultraviolet irradiation intensity is adjusted; meanwhile, a start instruction is sent to the ozone generation module to control the ozone generator to generate ozone.

[0082] When the MCU control module detects that the weight exceeds the threshold, the ultraviolet irradiation control module and the ozone generation module are activated, enabling ultraviolet irradiation and ozone treatment of the vegetables to improve the preservation effect.

[0083] S300: The ozone sensor in the ozone generation module monitors the ozone concentration in real time and sends the concentration signal to the MCU control module.

[0084] By monitoring the ozone concentration in real time through the ozone generation module, it can ensure that the ozone concentration is stably within the optimal sterilization range and avoid being harmful to humans.

[0085] S400: After the MCU control module receives the ozone concentration signal, it compares the concentration signal with a preset threshold. If the concentration signal exceeds the preset threshold, it sends a stop instruction to the ozone generation module to control the ozone generator to stop generating ozone; if the concentration signal is lower than the preset threshold, it sends a start instruction to the ozone generation module to control the ozone generator to generate ozone.

[0086] Based on the deviation between the ozone concentration signal and the preset threshold, the MCU control module controls the ozone generation module to generate ozone or stop producing ozone, which can achieve precise control of the ozone concentration.

[0087] S500: After the preset freshness preservation period ends, the MCU control module sends a shutdown instruction to the ultraviolet irradiation control module and the ozone generation module to turn off the ultraviolet irradiation and ozone generation functions.

[0088] The freshness preservation control method for the refrigerator with integrated LED and ozone provided in this embodiment detects the weight change in the vegetable storage area of the refrigerating chamber through a gravity sensor and sends a weight signal to the MCU control module. The MCU control module determines whether to start the freshness preservation measures based on the weight signal and activates the ultraviolet irradiation control module and the ozone generation module. At the same time, the ozone generation module monitors the ozone concentration in real time and sends the concentration signal to the MCU control module. Based on the deviation between the ozone concentration signal and the preset threshold, the MCU control module controls the ozone generation module to generate ozone or stop producing ozone. The entire method improves the freshness preservation effect, reduces energy consumption, and provides a better user experience through intelligent control and precise control.

[0089] In some embodiments of the present application, the following steps are further included:

[0090] S410: The ozone generation module monitors the concentration value of ozone in real time, generates an ozone concentration signal, and sends it to the MCU control module.

[0091] S420: After the MCU control module receives the ozone concentration signal, it compares the concentration signal with a preset threshold. The preset threshold includes an upper threshold and a lower threshold. The upper threshold is 6 ppm, and the lower threshold is 4 ppm.

[0092] S430: According to the comparison result, the MCU control module sends a control instruction to the ozone generation module to control the ozone generation module to generate ozone or stop producing ozone.

[0093] Specifically, if the concentration signal exceeds the upper threshold of 6 ppm, the MCU control module sends a stop instruction to the ozone generation module to control the ozone generator to stop generating ozone; if the concentration signal is lower than the lower threshold of 4 ppm, the MCU control module sends a start instruction to the ozone generation module to control the ozone generator to generate ozone; if the concentration signal is within the concentration range of 4 - 6 ppm, the MCU control module maintains the current working state of the ozone generation module.

[0094] The control method of this embodiment can achieve precise control of ozone concentration by controlling according to the deviation between the ozone concentration signal and the preset threshold. After receiving the ozone concentration signal, the MCU control module compares the concentration signal with the preset threshold and sends a control instruction to the ozone generation module according to the comparison result. If the concentration signal exceeds the upper threshold, it controls the ozone generator to stop generating ozone; if the concentration signal is lower than the lower threshold, it controls the ozone generator to generate ozone; if the concentration signal is within the threshold range, it maintains the current working state of the ozone generation module. The entire control method stabilizes the ozone concentration through a hysteresis control algorithm, avoids frequent start and stop, and improves control accuracy and system stability.

[0095] In some embodiments of the present application, the specific steps of adjusting the ultraviolet irradiation further include:

[0096] S210: Gradually increase the working current of the UVC - LED through a digital potentiometer.

[0097] The V - I conversion circuit in the ultraviolet irradiation control module is implemented based on a digital potentiometer. By adjusting the resistance value of the digital potentiometer, the input voltage is changed, thereby adjusting the working current of the UVC - LED. The MCU control module sends a control instruction to the ultraviolet irradiation control module to control the digital potentiometer to gradually increase the working current of the UVC - LED until the target radiation power is reached.

[0098] S220: Match the ultraviolet irradiation parameters according to the preset vegetable type, including irradiation duration and radiation power level.

[0099] The MCU control module matches the ultraviolet irradiation parameters according to the preset vegetable type, including irradiation duration and radiation power level. Different types of vegetables have different requirements for ultraviolet irradiation. By matching the ultraviolet irradiation parameters, the fresh - keeping requirements of different vegetables can be met.

[0100] In the ultraviolet irradiation adjustment step of this embodiment, the working current of the UVC-LED is increased in stages by a digital potentiometer, and the ultraviolet irradiation parameters, including irradiation duration and radiation power level, are matched according to the preset vegetable type. By adjusting the ultraviolet irradiation intensity, the fresh-keeping requirements of different vegetables can be met, the fresh-keeping effect can be improved, and the post-harvest life can be extended. At the same time, by increasing the working current of the UVC-LED in stages by a digital potentiometer, the precise adjustment of the ultraviolet irradiation intensity can be achieved, and the control accuracy can be improved.

[0101] In some embodiments of the present application, it further includes a safety control step:

[0102] S600: When the ozone concentration signal indicates that the concentration exceeds 8 ppm and lasts for 30 minutes, control the ozone generation module to stop generating ozone.

[0103] Specifically, the ozone sensor in the ozone generation module monitors the ozone concentration in real time and sends the concentration signal to the MCU control module. After receiving the ozone concentration signal, the MCU control module determines whether the concentration exceeds 8 ppm and whether the duration exceeds 30 minutes. If the conditions are met, a stop instruction is sent to the ozone generation module to control the ozone generator to stop generating ozone.

[0104] S700: At the same time, turn off the ultraviolet irradiation control module. That is, when the MCU control module sends a stop instruction to the ozone generation module, it also sends a shutdown instruction to the ultraviolet irradiation control module to turn off the ultraviolet irradiation control module.

[0105] When the ozone concentration exceeds 8 ppm and lasts for 30 minutes, the ozone gas may cause harm to the human body. Through the safety control step, the situation of ozone concentration exceeding the standard can be detected and processed in time, protecting human health. At the same time, it can prevent the equipment from being in a high-concentration ozone gas environment for a long time, extend the service life of the equipment, and improve the safety and reliability of the system.

[0106] The safety control step of this embodiment monitors the ozone concentration in real time, and when the ozone concentration exceeds the preset safety threshold and the duration exceeds the preset time threshold, controls the ozone generation module to stop generating ozone and turns off the ultraviolet irradiation control module at the same time. The safety control step can detect and process the situation of ozone concentration exceeding the standard in time, protect human health, improve the safety and reliability of the system, avoid equipment damage, and extend the service life of the equipment. The entire safety control step protects human health, improves system safety, and avoids equipment damage.

[0107] In some embodiments of the present application, the preset fresh-keeping period is dynamically adjusted according to the weight signal of the gravity sensor. The greater the weight value detected by the gravity sensor, the longer the preset fresh-keeping period.

[0108] The gravity sensor monitors the weight change in the vegetable storage area of the refrigerating chamber in real time and sends the weight signal to the MCU control module. After receiving the weight signal, the MCU control module dynamically adjusts the preset fresh-keeping period according to the magnitude of the weight signal. The larger the weight signal, the more vegetables are placed, and the longer the preset fresh-keeping period; the smaller the weight signal, the fewer vegetables are placed, and the shorter the preset fresh-keeping period.

[0109] It can be understood that when fewer vegetables are placed, the preset fresh-keeping period is shorter, which can save energy; when more vegetables are placed, the preset fresh-keeping period is longer, which can ensure that the vegetables are fully fresh-keeping processed. By dynamically adjusting the preset fresh-keeping period according to the weight signal, the flexibility and applicability of the system are improved.

[0110] According to the content of the above embodiments, the present application provides a fresh-keeping control system and method for an LED and ozone integrated refrigerator. The ozone concentration is monitored in real time by an MQ131 sensor, and the MCU dynamically controls the start and stop of the ozone generator according to the sensor feedback to form a closed-loop control. It breaks through the limitations of traditional open-loop control and realizes precise adjustment. Utilizing the inverse relationship between the gas-sensitive resistance value and the ozone concentration, combined with a voltage-dividing circuit and ADC conversion, the physical signal is converted into a digitally programmable signal to achieve adaptive control of environmental response. An MQ131 low-cost gas-sensitive sensor is adopted, and through the dual-output mode of analog signal (AOUT) and digital signal (DOUT), it not only meets the high-precision analog quantity acquisition requirements but also supports the threshold alarm function. The MOS transistor controls the ozone generator to replace the mechanical relay, which has the characteristics of no spark and high-frequency switching, and reduces power consumption while avoiding excessive ozone accumulation. The intelligent regulation of the ozone concentration is achieved through a closed-loop link. Combining low-cost hardware and software algorithm optimization, it is significantly superior to the traditional ozone control scheme in terms of accuracy, safety, and user experience, providing a cost-effective upgrade path for the fresh-keeping technology of household refrigerators.

[0111] After considering the specification and the practice disclosed herein, those skilled in the art will readily conceive of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

Claims

1. A refrigerator LED and ozone integrated freshness control system, characterized in that: include: An ultraviolet radiation control module, an ozone generation and monitoring module, a gravity sensor and an MCU control module, wherein the ultraviolet radiation control module and the ozone generation module are integrated into the same circuit board; The ultraviolet radiation control module is used to control the opening or closing of the ultraviolet radiation and adjust the intensity of the ultraviolet radiation; The ozone generation and monitoring module is used to control the generation or stop of ozone, monitor the ozone concentration, and generate an ozone concentration signal to send to the MCU control module; The gravity sensor is arranged in the vegetable storage area of ​​the refrigerator, and is used to detect the placement status of the items. When the trigger threshold is reached, a trigger signal is generated, and the trigger signal is sent to the MCU control module; The MCU control module is electrically connected to the ultraviolet irradiation control module, the ozone generation and monitoring module and the gravity sensor respectively; The MCU control module is configured as follows: Receive a trigger signal from the gravity sensor, and control the ultraviolet irradiation control module to start ultraviolet irradiation according to the trigger signal, and control the ozone generation and monitoring module to generate ozone, and turn off the ultraviolet irradiation and ozone generation functions after the preset preservation period ends; The ozone concentration signal of the ozone generating and monitoring module is received, and according to the ozone concentration value, the ozone generating and monitoring module is controlled to generate ozone or stop generating ozone.

2. The refrigerator LED and ozone integrated freshness-keeping control system according to claim 1, characterized in that: The ultraviolet radiation control module includes: a VI conversion circuit and a UVC-LED; The UVC-LED is used to generate ultraviolet radiation, and the parameters of the UVC-LED include: peak wavelength 270-280nm, radiation power 4-20mW, and operating current 20-140mA; The VI conversion circuit is electrically connected to the UVC-LED, and the VI conversion circuit is implemented based on a digital potentiometer and is used to control the operating current of the UVC-LED by adjusting the input voltage; The MCU control module automatically controls the ultraviolet radiation control module to switch the UVC-LED to a light-on state when the refrigerator door is opened.

3. The refrigerator LED and ozone integrated freshness-keeping control system according to claim 2, characterized in that: The ozone generation and monitoring module includes: an ozone generator, an ozone sensor and a MOS tube driving circuit; The ozone generator is used to generate ozone, and the ozone sensor is used to monitor the ozone concentration and generate an ozone concentration signal to send to the MCU control module; The ozone sensor is an MQ131 gas sensor, and its gas resistance value is inversely proportional to the ozone concentration; The MOS tube driving circuit is electrically connected to the ozone generator, and the MOS tube driving circuit is used to dynamically adjust the output power of the ozone generator through a PWM signal.

4. The refrigerator LED and ozone integrated freshness-keeping control system according to claim 3, characterized in that: The MCU control module has a built-in hysteresis control algorithm; The MCU control module is also configured as: When the monitored ozone concentration is greater than 6ppm, the ozone generation and monitoring module is controlled to shut down the ozone generator; when the monitored ozone concentration is less than 4ppm, the ozone generation and monitoring module is controlled to restart the ozone generator.

5. The refrigerator LED and ozone integrated freshness-keeping control system according to claim 1, characterized in that: The triggering threshold of the gravity sensor is 50-200g.

6. A refrigerator LED and ozone integrated freshness control method, applied to the refrigerator LED and ozone integrated freshness control system according to any one of claims 1 to 5, characterized in that: Includes steps: The gravity sensor detects the weight change of the vegetable storage area in the refrigerator, generates a weight signal and sends it to the MCU control module; When the MCU control module detects that the weight exceeds a threshold value, the ultraviolet radiation control module is activated to turn on and adjust the ultraviolet radiation, and the ozone generation module is activated to generate ozone; The ozone generation module monitors the ozone concentration in real time, generates an ozone concentration signal and sends it to the MCU control module; The MCU control module controls the ozone generating module to generate ozone or stop producing ozone according to the deviation between the ozone concentration signal and a preset threshold value; The MCU control module turns off the ultraviolet radiation and ozone generation functions after the preset preservation period ends.

7. The refrigerator LED and ozone integrated freshness control method according to claim 6, characterized in that: The step of controlling according to the deviation between the ozone concentration signal and the preset threshold value comprises: When the real-time ozone concentration is greater than 6ppm, the MCU control module sends a stop generation instruction to the ozone generating module; When the real-time ozone concentration is less than 4ppm, the MCU control module sends a start generation instruction to the ozone generating module; The current working state of the ozone generating module is maintained within a concentration range of 4-6 ppm.

8. The refrigerator LED and ozone integrated freshness control method according to claim 6, characterized in that: The step of adjusting the ultraviolet radiation comprises: The operating current of the UVC-LED is increased in stages through the digital potentiometer until the target radiation power is reached; Ultraviolet irradiation parameters are matched according to preset vegetable types, wherein the parameters include irradiation duration and radiation power level.

9. The refrigerator LED and ozone integrated freshness control method according to claim 6, characterized in that: It also includes safety control steps: When the ozone concentration signal indicates that the concentration exceeds 8 ppm and lasts for 30 minutes, the ozone generating module is controlled to stop generating ozone, and the ultraviolet radiation control module is turned off.

10. The refrigerator LED and ozone integrated freshness control method according to claim 6, characterized in that: The preset fresh-keeping period is dynamically adjusted according to the weight signal of the gravity sensor. The larger the weight value detected by the gravity sensor, the longer the preset fresh-keeping period.

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