Research On A Current Source-fed Type Parallel Resonant Ozone Generator Power Supply Based On Phase-shifted Control

Having been conducted a thorough study on a great number of references and existing technologies developed and studied by others all over the world, a whole and systematical research on the inductive phase-shift PWM controlled load parallel resonant DBD type Power supply of ozonier has been developed, including three key technologies such as the phase-shift circuit mode, the phase-shift control properties and circuit design.The main works of this dissertation are as follows:Firstly,the working Processes of the parallel resonant DBD type ozone generating power supply are systematically analyzed.Then the advantages and disadvantages between two circuits are compared.Ultimately the phase-shift PWM controlled load parallel resonant DBD type Power supply of ozonier which uses reverse blocking IGBT is chosen.Secondly, the nonlinear time domain analysis model of load was obtained by analyzing the time-domain electric waveforms of the power supply.The working processes of the discharge unit and the full bridge phase shift PWM control current type parallel resonant DBD ozone power supply system of phase shifting adjustment feature are analyzed.The general formula between the discharge power and the phase-shifting Angle is deduced,and the power curve over different phase-shifting angle of the ozone generator with different load structure is obtained.Thirdly, with the method of fundamental wave analysis, the sinusoidal voltage source fundamental wave analysis model of the power supply of the DBD type generator is obtained.The gas gap of the generator is equivalent to a parallel circuit, which consists of two nonlinear fundamental wave equivalent elements-resistor R and capacitor C.Based on this analytical model, the ozone generator power relationship with the phase-shifting Angle curve is obtained.Then, a 220W 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, the inverter circuit, high-frequency transformers and control systems are presented.In the control system, a current closed-loop control in a fixed frequency is applied to adjust discharge power, while the frequency tracking and phase-locked technology has been used to ensure the inverter work in a small capacitive quasi-resonant state. In addition, the output voltage PID closed-loop control is used to adjust the size of the phase-shift angle. Finally, the key circuit is designed and analyzed.Finally; experimental results verify the effectiveness of the proposed analysis and design, and the system is stable and reliable with high practical engineering value.