TW201718032A - Array type high-power ultraviolet light sterilization system maintaining the stable optical power output at different temperatures and achieving a purpose of temperature compensation - Google Patents

Abstract

This invention relates to an array type high-power ultraviolet light sterilization system, particularly referring to a short-wavelength ultraviolet light sterilization system with a microcontroller as a core and integrating with an automatic optical power control system to achieve an effect of optical power control by performing light detection with infrared light and automatically controlling an ultraviolet light switching mechanism, as well as applying the microcontroller to develop a short-wavelength light-emitting diode that maintains a stable optical power output, and through a power compensation mode and modification of compensation parameter of an automatic optical power control circuit. In the automatic optical power control system, the operation is performed by utilizing the microcontroller. When the optical power of the ultraviolet light diode changes with the temperature, the current of a driving circuit can be automatically adjusted to allow the short-wavelength ultraviolet light diode to maintain stable optical power output at different temperatures and achieve a purpose of temperature compensation.

Description

Array type high power ultraviolet light sterilization system

The array type high-power ultraviolet light sterilization system of the invention is mainly applied to the technology of realizing the capability of the hand-held sterilization system by the short-wavelength ultraviolet light combined with the automatic optical power control system.

In recent years, the prevalence of infectious diseases is serious. Many developing countries are the first to bear the brunt of the lack of medical resources. Especially in the case of global epidemic diseases, and the mutations of infectious diseases are rapid, the treatment can not be sure of immediate and perfect cure. It is impossible to prevent. Increasing the pre-disinfection step can effectively prevent the spread of infectious diseases and avoid the shortage of medical resources.

There are many types of disinfection methods on the market. Only the ultraviolet disinfection method has high execution effect and no residual harmful substances. The advantage of ultraviolet light sterilization is that the sterilization effect is fast and there is no secondary pollution. It can also eliminate the heating and liquid processing problems required for other sterilization.

Ultraviolet Germicidal Irradiation (UVGI) is a kind of ultraviolet light (Ultraviolet) that produces short-wavelength UV light to disinfect or kill microorganisms. UVGI disinfection has been widely used in medical and environmental disinfection in the mid-20th century. In recent years, it has been widely used in the disinfection and purification of food, air and water. UVGI is most effective in short-wavelength UVC ultraviolet light sterilization, and its ultraviolet radiation can effectively destroy the nucleic acid in the organism and lose its basic survival function. The UVGI is installed in the air circulation system and the water supply system to effectively remove microorganisms harmful to human health in the environment.

Therefore, the present invention determines the feasibility of this research based on the above related problems to solve the above problems. The present inventors conducted prevention of infectious diseases by observing ultraviolet light sterilization and using ultraviolet light to eliminate infectious diseases in public places. Nowadays, the transportation is convenient, the countries go back and forth frequently, and the infectious diseases spread around the country with the contact of the human body. The invention can be applied to prevent the spread of infectious diseases, and use the bactericidal action to eliminate the infectious diseases. The automatic optical power control circuit achieves a stable and no secondary pollution sterilization effect. Application to environmental sterilization can reduce the growth of infectious pathogens, to avoid contact through the human body, resulting in increased infection rate. The number of infected patients can be controlled stably and the loss of medical resources can be reduced. If a new infectious disease is found, the ultraviolet light tolerance of the corresponding infectious disease can be found, which can be effectively eliminated immediately.

The technical means applied to solve the problem lies in: a short-wavelength ultraviolet light sterilization system with a microcontroller as the core and an integrated automatic optical power control system, which can satisfy the user's protection mechanism to avoid the need of ultraviolet light irradiation. In this system, infrared light detection and automatic control of the ultraviolet light switching mechanism, using the Arduino ATMEGA328P microcontroller to develop a short-wavelength light-emitting diode to maintain a stable optical power output, through the power compensation of the automatic optical power control circuit Modification of the mode and compensation parameters to achieve the effect of optical power control. In the automatic optical power control system, the operation is performed by the microcontroller, and when the optical power of the ultraviolet light diode changes with temperature, the current amount of the driving circuit can be automatically adjusted, so that the short-wavelength ultraviolet light diode is still at different temperatures. It can maintain stable optical power output and achieve temperature compensation. Combined with the APC system for measurement and confirmed its bactericidal effect, it is used in this system and works at -40 At °C~80°C, the optical power can achieve a stable effect, the advantage of the adjustable frequency, to match the biological properties of the biological tissue to be measured, and the use of the imaging system to assist in the judgment and analysis from non-invasive impedance sensors. The information received has an improvement in efficacy and is the primary destination.

The advantages of the design of the invention: high efficiency: small volume, energy saving, controllable optical power to remove various bacteria, and short disinfection time.

Diversification: Combine different wavelengths to produce different applications, portable micro-sterilization systems and modular design applications, and future industrial solidification and intelligent lighting equipment.

Key technology: stable output of luminous power at any ambient temperature, modular design, can be applied to small and medium and large equipment systems, human body can be cut off immediately, protect human body safety, different wavelengths can produce different applications.

10‧‧‧Microcontroller

20‧‧‧Infrared motion sensor

30‧‧‧Instrument Amplifier

40‧‧‧Short-wavelength ultraviolet light-emitting diode

50‧‧‧Lighting diode

First figure: is a system architecture diagram of the present invention.

Second figure: is a hardware design logic architecture diagram of the present invention.

The third figure is a logical architecture diagram of the software design of the present invention.

Fourth figure: A schematic diagram of a three-dimensional combination of the present invention.

Table 1: is a graph showing changes in temperature change characteristics of short-wavelength ultraviolet light.

Table 2: UV light dose meter for common bacterial viruses.

Table 3: Table of the relationship between optical power and temperature.

Table 4: Temperature change optical power meter for short-wavelength ultraviolet light.

Table 5: Comparison table of short-wavelength ultraviolet light sterilization efficiency.

In order to make it easier for those skilled in the art to understand the art to understand the construction contents of the present invention and the functional benefits that can be achieved, a specific embodiment will be listed and described in detail as follows: an array type high power ultraviolet The light sterilization system, the system through the Arduino development board as the core architecture of digital automatic optical power control modularization, as shown in the first figure, this development board uses the ATMEGA328 microcontroller produced by ATMEL as the main controller, this architecture has It is quite mature and expands in combination. It can be added to many peripheral applications and sensing devices, such as wifi transmission, remote switching devices and sensors. When using the Arduino system, its IDE development environment is the main software writing program, and its programming can be used in a variety of combinations and combinations of functions and analog digital and digital signal circuits.

The short-wavelength ultraviolet light automatic optical power control sterilization system is composed of the following hardware components, including: a microcontroller 10, an infrared motion sensor 20, an instrumentation amplifier 30, a short-wavelength ultraviolet light-emitting diode 40, and a light-emitting diode. Body 50; wherein: the microcontroller 10, the system uses ATMEL's ATMEGA328P microcontroller as the core controller of the main system, receives external signals for calculation, to achieve the system functions required for the experiment; the main function of the infrared motion sensor 20 It is the detection of the heat source movement of the human body. It belongs to the two-dimensional or three-dimensional induction mode. Due to the low-voltage working mode, it is widely used in various types of automatic induction electrical equipment. The main function of the instrumentation amplifier 30 is to read the short-wavelength ultraviolet light-emitting diode. The voltage across the body 40 and the light-emitting diode 50 is input to the microcontroller for calculation; the short-wavelength ultraviolet light-emitting diode 40 is selected from SMD UVCLEDs developed by the foreign company Crystal IS, and its wavelength is between 250 nm. -400nm, the characteristics of the ordinary UVC lamp has a longer life, power saving and so on; the light-emitting diode 50 uses Nichia NSSM016A for the RGB LED developed by Nichia.

The invention can be divided into two parts: hardware architecture design and software architecture design, hardware The logic of the design of the architecture is that when the user turns on the power and the switch of the sensor, the infrared motion sensor 20 uses the human body protection as the main purpose to set whether the human body is within the set safety distance, and if there is no set distance. After sensing the human body reaction, the sensing input signal is sent to the microcontroller 10, and the microcontroller 10 controls the activation of the ultraviolet light germicidal lamp to destroy the pathogen of the desired sterilization surface, and the hardware design logical architecture diagram As shown in the second figure.

In terms of software system flow, after the system starts, the microcontroller will read from The signal value of the button, and then confirm whether the human body infrared sensor detects the proximity of the human body. If it is confirmed that someone is close, the signal sent by the microcontroller to the ultraviolet light is immediately cut off, and it is confirmed that the human body infrared sensor is not detected. When any moving object is approached, the ultraviolet light diode is activated to sterilize the button surface. The flow chart is shown in the third figure.

The study ambient temperature was set to rise from -40 ° C to 80 ° C, with automatic light The power control system circuit (APC) performs power control of the UVC LED. When the temperature varies from 65 °C, the current is between 132 and 220 mA, and the voltage is changed. The variation is between 6.67 and 7.46V, and the optical power changes are shown in Table 1.

In order to maintain a stable optical power value as much as possible under temperature changes, It can be more accurately controlled in sterilization applications, using automatic optical power control system circuits. The experimental data is shown in Table 1. It can be seen from the table that the optical power of the UVC LED measured at -30 ° C is 4.973 mW/cm 2 , and when the temperature is raised to 35 ° C, the measured optical power is 4.445 mW/cm 2 , and the temperature varies by 65 ° C. The total power change is about a temperature rise, and the optical power is changed by 0.008 mW/cm2. The corresponding temperature change trends are shown in Table 3 and Table 4. The performance of the APC circuit for the optical power stabilization of the UVC LED is shown, and its performance is more stable at a temperature of 0 ° C to 35 ° C and its optical power change amount is further reduced to a temperature change of 0.003 mW/cm 2 per degree.

UVC LED automatic optical power sterilization system is made of stainless steel The shell and the replaceable lamp head sterilization module facilitate the hand-illuminated contaminated block required for hand-held illumination, and are connected with the automatic optical power control system circuit to complete the practical application of the work, as shown in the fourth figure. This system is mainly based on the UVC LED sterilization function, and can change the UV LED of its device according to different needs.

For this system, UVC is used to detect the bactericidal function of bacteria. The UVC LED automatic optical power sterilization system is irradiated to the bacteria-E. coli which is easily contacted in the life cultured in the quartz test tube, and is irradiated with the UVC sterilization system to measure the optical density of cells (OD 600) by the BioPhotometer developed by Eppendorf. The bactericidal results were measured, and the light transmittance of the number of bacteria in the culture solution was measured by light transmittance, and the decay value of the number of bacteria was estimated, as shown in Table 2, wherein the bactericidal dose required for the hepatitis virus was 8000 (μW). -sec/cm2), the bactericidal dose required for influenza virus is 6600 (μW-sec/cm2), and the bactericidal dose required for poliovirus is The sterilizing dose required for 7000 (μW-sec/cm2), Escherichia coli is 7000 (μW-sec/cm2), and the bactericidal dose required for tetanus is 22000 (μW-sec/cm2). It is known that the UVC dose output by the system is much larger than the dose required for sterilization. Its bactericidal effect should be far better than its expected results.

According to the light penetration data obtained from the experiment, E. coli was passed through UVC. After the LED irradiation, the sterilization efficiency is greater than the growth rate of E. coli, and the E. coli number is reduced as shown in the table, and the reference paper proves that the experimental circuit can effectively reduce the proliferation of bacteria and viruses, as shown in Table 5.

The invention realizes automatic combination of short-wavelength ultraviolet light diode UVC LED The Automatic Photo Power Control (APC) achieves the capability of a handheld sterilization system with stable optical output performance at different ambient temperatures. The UVC LED has a wavelength between 200 and 400 nm and an automatic optical power control system that stabilizes the optical power required for output sterilization. The APC automatic optical power control system circuit removes the influence of ambient light temperature on the optical power of the UVC LED. The automatic adjustment of the UVC LED optical power is shortened to eliminate the sterilization time of various bacteria and the requirement of viral UV dose.

At present, the data obtained in this study are compared with the microorganisms provided in the reference. The UV dose has been found to kill common influenza viruses (6.6mW-sec/cm2) in seconds and to change the amount of light power output through the UVC LED to extend or shorten the sterilization time. The optical power value can be adjusted through the circuit in order to eliminate the UV dose required by different bacteria and viruses.

Through experiments, it can be known that the short-wavelength wavelength of UVC LED is both destroyed and destroyed. The effectiveness of the microorganisms is also suitable for environmental sterilization. In this study, the automatic optical power control circuit is used to accurately output the ultraviolet light dose required for sterilization with the stable output power of the UVC LED, and reduce the error of the optical power caused by the environment, so that the stable optical power can be effectively The ultraviolet light dose is calculated to achieve the accuracy of sterilization, and the energy consumption and the time of exposure to ultraviolet light are also reduced. Since UVC is dangerous to cells in living organisms, long-term exposure can cause harm to the human body. The built-in passive infrared sensor (PIR) detects the distance between the user and the UVC LED sterilization system and drives the protection mechanism. The UVC LED system is turned off to prevent injury when the system senses that the human body signal may be exposed to ultraviolet light.

In summary, the present invention provides an array of high power ultraviolet light. The sterilization system, after the actual production of the inventor and the repeated operation test, proves that the functional benefits expected by the present invention can be achieved, and at the same time, it is the first creation that has not been seen before, and has industrial utilization value, it is already In accordance with the establishment of the practicality and progress of the invention patent, according to the provisions of the Patent Law, the application for invention patents is submitted to the bureau.

10‧‧‧Microcontroller

20‧‧‧Infrared motion sensor

30‧‧‧Instrument Amplifier

40‧‧‧Short-wavelength ultraviolet light-emitting diode

50‧‧‧Lighting diode

Claims (3)

An array type high-power ultraviolet light sterilization system, which mainly uses a micro-controller as a core short-wavelength ultraviolet light sterilization system and integrates an automatic optical power control system, uses infrared light detection and automatically controls ultraviolet light switching mechanism, and uses a microcontroller In order to maintain the stable optical power output of the short-wavelength light-emitting diode, the power compensation method and the compensation parameter of the automatic optical power control circuit are modified to achieve the effect of optical power control. In the automatic optical power control system, the microcontroller is utilized. Performing calculations, when the optical power of the short-wavelength light-emitting diode changes with temperature, the current amount of the driving circuit can be automatically adjusted, so that the short-wavelength ultraviolet light diode can maintain a stable optical power output at different temperatures. The array type high-power ultraviolet light sterilization system according to claim 1, wherein the ambient temperature of the short-wavelength light-emitting diode is -40 ° C to 80 ° C. The array type high-power ultraviolet light sterilization system according to claim 1, wherein the short-wavelength light-emitting diode has a wavelength of 200-400 nm.