Research on power supply used in dielectric barrier discharge

Summary form only given. A 20 kW, 50 kV power supply with the frequency ranging from 50 Hz to 50 kHz used in dielectric barrier discharge (DBD) is introduced in this paper. The power supply consisted of commuting module, high frequency inverter, high frequency and high voltage transformer and feedback control circuit. More considerations were put on electrical efficiency to increase work frequency. An advanced quasi-resonant zero current switching technology had been used in this device. The inductor of high voltage transformer was designed to construct the quasi-resonant circuit with a resonant capacitor to reduce the transformer's energy dissipation that would be serious as the frequency rises. The inverter was mainly constituted of four IGBTs and four crowbars. Each IGBT would be spontaneously closed when the current was zero and was opened by control on its grid. By utilizing of quick reverse diodes, the inverter absorbed less energy than traditional IGBT inverter. By those means the energy dissipated in switch and transformer was greatly reduced and the work frequency reached 50 kHz. The power supply for DBD also had advantages of low cost, little volume and convenient control. The power supply had been used in DBD research and worked stably.