The problem at the solution level actually involves many details, especially the actual application scenarios. In the first section, "where is it used?" For example, in simple terms, deep ultraviolet UVC-LED is used in this way:
3.1 static surface sterilization
Intelligent toilet, food fresh-keeping box, smart trash can: embedded UVC-LED lamp beads in the right side or top of the cavity, use ultraviolet radiation to sterilize and disinfect the germicidal objects, sterilization time according to the irradiation distance, area and sterilization efficiency requirements for a preliminary conversion.
3.2 near static water sterilization
Humidifier, drinking water tank, ice maker: its characteristics are small water flow or long term bacteriostatic. Usually, a single UVC-LED sterilization module is set at the top or the low end of the water tank to irradiate the whole water body with ultraviolet rays, so as to realize the sterilization and bacteriostasis of water.
3.3 dynamic water sterilization
This kind of application water flow is usually 1-2L/min, not more than 2L/min, the need for its pipeline in series with a special UVC-LED sterilization module, in the module to complete the flow of water within the immediate sterilization.
3.4 air sterilization
Air purifier and all kinds of air conditioners.
In the new Haier air conditioner, the 2 hours air sterilization rate is 90% of the bactericidal effect. The problem is that infants who live in sterile environments will have poorer immunity. This fact has been widely accepted and scientifically explained. Completely killing bacteria in the air is not the mission of deep ultraviolet sterilization technology. Yes, no technology should completely kill the bacteria in the air, and the entry point of deep ultraviolet air sterilization technology should be in the filter and evaporator that easily cause air pollution [2]. In the long-term use, dust and water vapor gather in these places, becoming a hotbed for all kinds of bacteria, odor breeding, but also directly lead to the deterioration of air quality in the living environment. Purify filter screen and evaporator should be the focus of deep ultraviolet LED technology.
3.5 about driving mode
A constant current circuit should be used to drive deep ultraviolet UVC-LED. As a result of:
1. The operating voltage of different batches of deep ultraviolet LED is usually different. In batch production, the constant voltage driving mode will lead to poor consistency of sterilization effect.
2. If the constant voltage drive is adopted, the temperature rise of the LED will cause the current of the LED to increase and the power of the light to become uncontrollable. Constant current drive can avoid this problem.