In more than a year of fighting against the new crown virus, human beings have comprehensively raised their health awareness, and their demand for disinfection and purification has gradually increased. UVC LED, as an environmentally friendly, energy-saving, and efficient disinfection protection method, has gradually become a prairie fire in this year.
Anxinmei was established in December 2020. Its predecessor was Shanghai Peking University Blu-ray Co., Ltd., which was established in 2000, and began to develop UVC LED products in 2016. At present, Anxinmei has successfully realized the vertical integration from UVC epitaxy-chip-package-module, and its products are widely used in surface sterilization, air sterilization, static water sterilization, flowing water sterilization and other application scenarios.
At TrendForce's 2021 UVC LED Industry Status and Technology Trends Seminar, Miao Yanzhen, Technical Director of Anxinmei Semiconductor, introduced the company's technological breakthroughs in mobile water sterilization solutions.
According to reports, the flowing water sterilization program has three major design difficulties: water inlet energy, structural reliability, and even energy distribution.
Structural reliability is mainly judged by pressure test, blasting test, water hammer test, etc.; the even distribution of energy needs to take reflection and eddy current into account; the energy of entering water directly affects the disinfection effect, and increasing the energy of entering water can strengthen the disinfection effect.
Miao Yanzhen believes that the best way to increase the water energy is to increase WPE on the epitaxial wafer and chip side. This is a fundamental problem for UVC LEDs to reduce costs and increase efficiency. However, due to the technical level, it is difficult to break through the photoelectric conversion efficiency of UVC LEDs in a short period of time.
Based on this, Anxinmei started from the application side and increased the input power to increase the water energy, such as increasing the number of UVC LED lamps and increasing the current.
However, Miao Yanzhen also pointed out that in the process of product development, there are often situations where multiple performances cannot be taken into account at the same time. For example, increasing the input power will inevitably bring higher heat, making heat dissipation an important factor in increasing water energy. Big obstacle.
Anxinmei uses water to absorb the heat generated by the LED in a breakthrough way to solve the heat dissipation problem.
It is reported that water has two major advantages as a heat absorption medium. One is that the specific heat capacity of water is high, and the other is that the temperature of water is relatively constant. But it also faces two problems: the heat conduction path is complicated, and the material selection is difficult.
Miao Yanzhen explained that there are not many materials that can be safely waded. Among the commonly used metal materials, aluminum has good conductivity, but aluminum cannot be waded; while the price of copper is relatively high.
In order to circumvent the material problem, Anxinmei innovatively developed a patented double-sided thermally conductive copper substrate based on the heat conduction path. On the copper substrate, it is equipped with an aluminum-based light emitting device with the functions of heat conduction, reflection, support, and positioning. Cup, heat can be conducted through the path of LED heat sink layer-copper substrate heat dissipation surface-aluminum-based reflector cup-glass-water.
After rigorous experimental testing, Anxinmei found that after using this copper substrate, under the condition of 200mA and 4 lamps, the temperature of the PCB substrate will rise by about 6.5-7℃, and the output energy can reach 88% of the original energy. ; In the case of 300mA, 7 lamps, the output energy can reach between 70%-75% of the original energy.
It is worth noting that the experimental data is a conclusion based on hundreds of hours of continuous experiments, which fully proves the stability of Anxinmei's double-sided thermally conductive copper substrate.
In terms of effectiveness, according to a third-party report, when the current is 200mA and the flow rate is 4L/min, when the current is 200mA and the flow rate is 4L/min, according to a third-party report, the Aximex UVC LED sterilization module can achieve a 100% sterilization rate; At 300mA and a flow rate of 6L/min, Anxinmei's UVC LED sterilization module can also achieve a sterilization rate of 99.99%.
In terms of structural reliability, Miao Yanzhen said that in the water hammer test, Anxinmei's deep ultraviolet LED dynamic water sterilization module has passed 100,000 tests without abnormalities, which can fully meet the needs of daily water disinfection products.
In terms of energy distribution, Miao Yanzhen said that in different locations of the water tank, the sterilization rate may not be consistent. From the point of view that the lamp beads are placed on the top, bottom and side center of the water tank respectively, the best effect is when placed on the top. He also pointed out that the irradiation area is more critical than the irradiation distance, and the LED layout should minimize the irradiation dead zone.
It is understood that Anxinmei has built five deep-ultraviolet LED full industry chain production lines, with an annual output of 180 million LED lamp beads, and can provide customized module solutions according to customer requirements. (Text: LEDinside Lynn)
