Design UVC LED Modules From The Perspective Of Optics And Structure To Overcome Different Sterilization Fields

- Feb 27, 2021-

As one of the emerging niche markets, the popularity of UV LED is increasing year by year. In recent years, more and more manufacturers have joined the UV LED R&D camp, actively expanding their layout to seize more market share. The "2019 Deep Ultraviolet LED Application Market Report-Sterilization, Purification and Water Treatment Market" report shows that in 2018, due to the impact of the global economic environment, UV LED manufacturers' revenues did not reach the expected explosive growth, but they also achieved stability growth of.

UV LED has a wide range of application scenarios. It is believed that in addition to the UVA industrial application market, the application of UVC in surface sterilization, air sterilization and purification, static water sterilization, and flowing water sterilization will become the main part of the UV LED market in the next five years (2019-2023). Growth momentum. Water purification sterilization, surface sterilization, air sterilization and some special sterilization areas have different requirements for UV LED modules, but they mainly involve sterilization rate, life cycle and safety issues.

Hangzhou Huiyi Technology Co., Ltd. designs high-performance UVC LED module solutions from the perspective of power, waveband and module structure in terms of the sterilization rate, life and safety of UVC LED products.

According to Dr. Meng Nan, the head of Huiyi Technology R&D Center, the sterilization rate is determined by three parameters, which are UVC LED power, UVC LED wavelength, and UVC LED sterilization time.

The UVC LED power directly affects the sterilization efficiency. If the flow module is to achieve a sterilization rate of 99.99% or even higher, the sterilization power needs to meet higher requirements. In addition, each LED has a different wave band and its power is also different. The data shows that the sterilization rate is affected by the LED band. For example, in the band from 273 to 281, the sterilization rate gradually decreases. It can be seen that the sterilization rate of the module is also directly related to the wavelength of the UVC LED. However, there are not many bands to choose from on the market at present, so more choices can only be provided in terms of power.

Dr. Meng Nan pointed out that there are three determinants of the sterilization rate. Its essence is the absorption of energy. When energy and power are both different, it can be controlled by the sterilization time, which involves the design of the structure. In general, the structural design of the module is guided by heat dissipation.

According to reports, both high-power modules and low-power modules face the problem of low photoelectric conversion efficiency. As a result, more than 95% of the power consumed by UVC LEDs is dissipated in the form of heat. Poor heat dissipation design will greatly affect the life of the module. . Therefore, the module structure design is based on the principle of heat dissipation first. Specifically, the junction temperature of the LED chip needs to be controlled below 85 degrees Celsius. On the one hand, choose the LED lamp bead substrate with the smallest thermal resistance. On the other hand, some special plans are made for the design of LED pads and the copper area is enlarged to achieve better heat dissipation. At the same time, in the shell structure design and module shell design, confined spaces are avoided and air convection is promoted. In addition, make full use of some additional heat dissipation devices, taking into account the size, heat dissipation, economy, and application environment of the module.

At present, Huiyi Technology has made some achievements in the fields of water purification and air sterilization.

In the field of water purification, the sterilization effect can be reflected in two aspects. One is to define the comparison of the total number of colonies before and after sterilization, that is, the sterilization rate (sterilization rate = total number of colonies after sterilization/total number of colonies in the original water x 100%). Usually the requirement of sterilization rate is 99.99%-99.9999%. The second is to define the total number of colonies remaining in the purified water after sterilization. With the national drinking water sanitation standard GB5749-85 as the guiding standard, the total number of colonies in the purified water outlet is currently less than 100cfu/ml.

Huiyi Technology provides static or dynamic UVC LED sterilization solutions that meet the requirements of customers' sterilization effect for existing household and commercial water purifiers. First of all, the purification module LED used by Huiyi Technology takes into account the use effect, service life and use cost. At the same time, there are three choices of Japanese, Korean, and Taiwanese, and the band adopts 265-275nm. In addition, the product is equipped with a patented heat dissipation and optical design to maximize the efficiency of the LED and meet the sterilization needs of customers for product upgrades.

It is reported that in 2018, Huiyi Technology shipped more than 1 million sets of UV-C LED modules. It is expected that a large number of stable shipments (domestic and foreign) in the water purification field will be shipped this year.

In addition, Huiyi Technology has launched a variety of solutions using stainless steel outer cylinders for cold and hot water in the kitchen. According to the customer's sterilization requirements and budget, we use multiple 265-275nm high-power LEDs to provide corresponding products for applications with a flow rate of 6-8L/min, achieving a sterilization effect ranging from 90% to 99.99%. The module adopts 304 food grade stainless steel as a whole, which has great application advantages in terms of safety, environmental protection and pressure resistance.

It is understood that compared to drinking water purification, the flow rate of kitchen hot and cold water applications is much greater than that of ordinary drinking water purifiers, generally above 6L/min. At present, the demand for this aspect is mainly put forward by the export market.

In terms of air sterilization, it is mainly the application of air conditioner with sterilization function. Dr. Meng Nan pointed out that air-conditioning products are generally used in closed environmental spaces. Due to the lack of fresh air ventilation measures, and the ambient temperature is usually between 18-30 degrees Celsius, it provides the most suitable environment for the proliferation of bacteria and viruses, which may easily lead to users. , Especially the repeated infections of susceptible people such as the elderly and children. The existing sterilization methods are not very time-effective, or cannot perform broad-spectrum sterilization for all types of bacteria and viruses, or the need for personnel to be absent during sterilization, resulting in insufficient ease of use.

In order to cope with these problems, Huiyi Technology has launched a small air conditioner sterilization module, which can be directly integrated near the air inlet of a household air conditioner. Its patented optical design makes full use of UV light, which can be linked with the air conditioner to achieve real-time purification, and is safe High, simple and convenient application.

Huiyi Technology has been deeply involved in the design and production of UVC LED modules, and is committed to providing products that meet customer needs efficiently. It was exhibited at the 2019 TrendForce Global UV LED Industry Seminar and attracted the attention of other participants.

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