The Research And Development Of Series Resonant Inverter Power Supply For DBD Ozone Generator

This paper is mainly concerned to research and develop high power series resonant inverter power supply for DBD ozone generator. Some key technologies of the power supply, for example the equivalent circuit, dynamical electrical characteristics, the topologies of the power supply, control strategy and its reality, are deeply researched on the basis of the operation principle of DBD ozone generator and series resonant inverter. Using the theory achievement in research of this paper a power supply for the ozone generator with the output of 2kg/h is developed successfully. The correction and the practical value of the theory is verified by the practical operation of the power supply. The main content of the thesis is summed up as follows:1. Research on inverter topologies of inverter power supply for high power DBD ozone generator. Two kinds of load resonant inverter topologies commonly used in inverter power supply for DBD ozone generator are compared in this paper, and the series resonant inverter is selected as the inverter topologies of the power supply.2. Research on load characteristics of DBD ozone generator. The operation principle of the DBD ozone generator powered by sinusoidal wave current source is analyzed in detail, and its fundamental wave equivalent circuit is presented at first time on the basis of the Fourier forms of the voltage dropped on the discharge gap. The dynamic electrical characteristics of the DBD ozone generator are researched and analyzed on the basis of this equivalent circuit, and the match range for the electrical parameters of the ozone generator is induced, witch will be benefit to the design of the power supply for DBD ozone generator.3. Research on the control strategy. After describing, analyzing and summing up of the control strategy for series resonant inverter, the frequency tracking phase shift PWM control is selected as the control strategy for the power supply of DBD ozone generator. The operation modes of the inverter with this control strategy are also analyzed, and a conclusion that the capacitive mode is suitable for the series resonant inerter used in the DBD ozone generator is arrived at. The characteristics and the ZCS condition of this control strategy are researched, and the maximum phase shift angle and a ZCS inverter prototype in witch the trigger pulses of power semiconductors in stationary arm is in phase with load current are proposed.4. Research on the reality of frequency tracking phase shift control strategy. A noveltype of frequency tracking phase shift control circuit based on CD4046 is proposed on the basis of summarizing the existing control circuit. The delay time problem of the circuit and the problem of starting of power supply are solved by using CD4046.5. Research on design and reality of the power supply. A drive circuit based on 2SD315 used in the series resonant inverter power supply for DBD ozone generator is proposed. A 40kw/lkHz prototype for the ozone generator with the output of 2kg/h is developed successfully on the basis of the theory achievement in research of this paper. The procedure of the design is introduced in this paper, and some experimental results are also given to verify the correction and feasibility of the theory.