The Dbd Dielectric Barrier Discharge Power Engineering Research

Power electronics applied in plasma technology utilizes electronics devices to control electrical power conversion. Electrical energy is transferred to kinetic , photic, chemic, thermal energy through plasma medium. Because DBD(Dielectric Barrier Discharge) has great advantage such as large area and stable plasma production, it has been widely used in industry application.This paper focus on the study of practical application of DBD type high frequency power supply.The research content basically includes three respects, which are load characteristic, main circuit topology as well as control scheme. Load characteristic consists of physics description and mathematic analysis. Physics description illustrates vivid image of discharge characteristic based on observation of experiment phenomenon and dielectric barrier discharge theory. From simple to complex, capacitance constant discharge voltage model and inductance capacitance constant discharge voltage model have been studied respectively. PSPICE method does a great deal good to analysis the more complex model. According to simulation result, electrical characteristic of DBD load has been induced and optimized working point has been determined.Then this paper introduces generally working principle of non-bridge and bridge topology. Several basic control schemes, such as PFM, PDM, PWM, PAM, are considered through simulation and experiment method, which makes it quite clear that PAM&PFM is fitful for the large power DBD high frequency discharge power supply. Working sequence of PAM&PFM frequency tracking and phase locked principle has been given. This kind of control method enable the maximum power output provided that power supply is working under good condition.Finally, design consideration has been given on the 20kW controlled rectifier full bridge inverter high frequency high voltage discharge power supply applied in the plastic surface treatment production line. This power supply has advantages of large power, high control ability, high function price ratio, high reliability. The final passage introduces the main circuit design, filter inductance design , transformer design , DC blocking capacitor selection, soft-switching design and implementation as well as master computer basic control of discharge power supply. Experiment results prove the validity of theory prediction.