The Research On Power Supply For DBD Ozone Generator

Nowadays most high power ozone generators used in our country rely on import, and one of the main reasons is the poor performance of the power supplies produced by factories of China. Line voltage of 50Hz or hard switching inverters are often used as the power supplies of the ozone generator which always operate on low frequency, high lost and low efficiency. The output power of these supplies is difficult to improve and the stress of the switches in the invertors is high. The open-loop control systems of these generators cause them hardly to restrain the interference. In order to solve these problems, phase-shifted full-bridge soft switching series resonant inverter is implemented in the power supply system, and this scheme is deeply analyzed in this paper. This paper involves:(1) Based on the characteristics of the ozone generator, after comparing of all kinds of power regulate method, phase-shift full-bridge series resonant circuit is proposed as the topology of the power supply of the ozone generators which can work at high frequency, low loss and high power factor, and easy to achieve close-loop control.(2) All kinds of working conditions of the power supply are analyzed in detail in this paper. The relationships of phase-shift angle and some important performance of the generator are deduced based on the analysis; include the output power, the maximum voltage on the generator and the working frequency. A set of design method and step is achieved with the analysis of these relationships.(3) In order to deal with the complexity of the analysis of all working conditions, the fundamental wave equivalent circuit of ozone generator powered by sinusoidal wave current source is used in the research of the power supply of the generator. The relationships of phase-shift angle and some important performance are also achieved with this frequency based analysis, and a set of design method is also achieved based on these relationships.(4) The model of the control circuits of power electronic circuits is building by trial and error method usually. This method not only wastes of time, but also goes wrong easily. This paper presents a simulation method based on the theory of finite state machine, which has been succeed in the simulation of the control circuit of phase-shift full-bridge soft switching circuit. This simulation method has the merits...