Research And Design Of High Power Ozone Generator Resonant Power Supply Research And Design Of High Power Ozone Generator Resonant Power Supply

Ozone,as an allotrope of oxygen,has been widely used in food preservation,medical treatment,wastewater treatment and other related fields in industrial production due to its strong oxidizing ability and sterilization ability.At present,most high-power ozone generators in China adopt high-voltage high-frequency alternating current to load to generate ozone by dielectric barrier discharge(DBD).The load of the generator is non-linear capacitive,because the number of high-power ozone generator load discharge units in parallel increases,and the equivalent capacitance of the load increases,resulting in an increase in the proportion of capacitive current in the power supply and a low power factor of the whole machine;Problems such as loss of power inverter switching tubes,increased switching stress,and increased output capacity of transformers limit the development of high-powered ozone generators.In view of the above problems,this article starts from the dynamic characteristics of the ozone generator load and uses the method of double inductance for resonance compensation to supply power,which solves the above problems to a certain extent.Among them,the parallel compensation inductor acts as a reactive power compensation for the load,and the series compensation inductor acts as a condition to provide series resonance for the load;in addition,this paper designs a power inverter control system with frequency tracking function to make the power inverter The frequency tracking load series resonance frequency realizes that the power inverter power tube works in the soft switching state,which further improves the working efficiency and stability of the whole machine.The main work of this article includes the following three parts:(1)In view of the problem that the capacitive discharge of the high-power ozone generator load discharge unit becomes more capacitive,the power factor of the whole machine decreases,and the output capacity of the transformer increases.This article uses the method of compensating the inductor in series and parallel at the same time to establish High-power ozone generator load circuit model,through Matlab simulation of this model for dynamic performance analysis and voltage amplitude-frequency characteristic analysis to obtain the design requirements for the compensation inductance value.The ozone generator with 52 discharge units connected in parallel is used as the experimental platform.Through experimental verification,it has been proved that after the parallel load compensation inductance can be solved to a certain extent,the output capacity of the transformer and the power of the whole machine can be solved by increasing the number of load discharge units Factors such as factor reduction;at the same time,the parallel compensation inductance increases the load series resonance frequency and further increases the load discharge power.(2)In view of the characteristics that the ozone generator has two stages of undischargedischarge during the increase of the load voltage and the dynamic change of the equivalent capacitance of the load,this article uses a combination of integrated phase-locked loop chip and integrated PWM control chip Scheme,design power inverter control system with frequency tracking function.Two load control methods are used to make the load undischargeddischarged to improve the stability of the frequency tracking system,and at the same time make the design of the entire control circuit easier.The inverter frequency of the power supply tracks the series resonance frequency of the load in real time,so that the inverter switch tube works in the soft switching state under the load discharge state,and successfully solves the problems of high-power generator power inverter switch tube loss and large switching stress.(3)The component selection and parameter design of the main circuit and control circuit of the ozone generator inverter power supply with an output power of 20 k W were carried out.Specifically,it includes a rectifying and filtering circuit,an inverter circuit,a driving circuit,a control and protection circuit,and an auxiliary power supply.The measured waveforms of the key circuits of the power supply are given to verify the correctness of the entire power supply design.