Research On The Characteristic Of High-frequency Power Supply Of Series Resonant Ozone Generator

As a strong oxidant and bactericide,ozone has been widely applied in the area of pollute water disposal, air clean, flue gas decontamination, medical apparatus disinfection, bleaching out the cloth, foodstuff preserving, liquor purification and manual aging technics.Industrially, dielectric barrier discharge (DBD) is adopt to produce ozone, the traditional equipment of directly step-up voltage is very simple and cheap, but it also has many shortages, such as large volume, low efficiency and output, so the high-frequency power supply become the development trend of the ozone generators.In the practical circle topology, the load assumes capacitive,when driven by high-frequency voltage, it would be in series resonant with the leak reactance of the high-frequency transformer, which will greatly affect the efficiency and stability of the ozone generator.In this thesis, we have developed a power supply of series-resonance high-frequency ozone generator, and then did research on the character of it, we have discovered:①It is a well linear relation between the ozone output and the average discharge power, so under the same condition, increase the average discharge power is the most effective method to increase the ozone output;②In the range of normal, the average discharge power increase linearly with the work frequency, so increasing the work frequency is the effective method to increase the average discharge power;③The capacitive character of the load makes the high-frequency power supply be in series resonant with the reactor. In order to keep the system working in the capacitive range, the working-frequency must less than the resonant frequency; in other words, the working-frequency is limited by the resonant frequency. ④reducing the turns of primary winding,reducing the length of layers, reducing the distance between the dominance winding and the secondary winding,could lead to reducing the leak inductance, so do the resonant frequency, and it is the most effective method to increase the ozone output.Based on the conclusions above, a power supply was designed, with a 7000V working voltage and 18kHz working-frequency. Loaded by a reactor, the average discharge power achieved 712W, and the ozone out put achieved 30.06g/h, the ozone concentration achieved 50.1g/m3.The researches accomplished were about a reactor with single air gap, its max output was 30g/h, while consumed discharge power of 712W, according to this proportion, to achieve an output of 1kg/h, the power of the power supply must be more than 21kW. The researches accomplished were about a reactor with single air gap, its max output was 30g/h, while consumed discharge power of 712W, according to this proportion, to achieve an output of 1kg/h, the power of the power supply must be more than 21kW. The following step is to design a power supply over 20kW, and makes the working-frequency over 1kHz even though loaded by heavy loads.