Research On A Current Source-fed Type Parallel Inductor-Compensated Load Resonant Power Supply For DBD Ozonizer

Ozone is a strong oxidant, which has been widely used in water treatment, sewage treatment, industrial oxidation, and health, etc. However, the Ozone manufacturing technology which widely used dielectric barrier discharge(DBD) is immature with some problems that include unstable DBD discharge cell parameters and vulnerable dielectric layer, and is difficulty to optimize the design of the power supply. Because of this, it is difficult to achieve a satisfactory performance in the power consumption, cost and efficiency. For improving the load adaptability and the efficiency of DBD ozone generator power supply, this article studies a current source-fed type parallel inductor-compensated load resonant power supplyFirstly, the discharge mechanism of dielectric barrier discharge type ozone discharge tube is described, and the load characteristics ar e experimentally studied. Besides, the load equivalent parameters are analysised detailly, which laid the theoretical foundation for the further study and the design of the power supply.Secondly, the working principle and the power adjustment method of th e current source type DBD ozone generator power supply are studied. At the same time, a detailed analysis of the current source-fed type inverter, which working in chopping control, is presented. By combinning with DBD ozone generator equivalent model, this article acquires the time-domain mathematical model of circuit. On the basis of mathematical models, the main features of power supply are studied.Finally, a 200 W current source parallel resonant DBD ozone generator is designed and an effective experimental study is carried out. At the same time, detailed analysis of the design process and the rectifier, chopper, the inverter circuit, high-frequency transformers and control systems are presented.In the control system, a current closed-loop control of the chopper working in a fixed frequency is applied to adjust discharge power, while the frequency trac king and phase-locked technology has been used to ensure the inverter work in a small capacitive quasi-resonant state. In addition, the working principle of power supply is analyzed in detail, and the principle and implement method of control system are recommended with current feedback PI controller, frequency tracking technology, and design of the key circuit.Experimental results can verify the proposed analysis and design, and the system is stable and reliable with high practical engineering value.