Design And Development Of High Voltage Power Supply System For Plasma Waste Gas Treatment

With the development of industry,the problem of environmental pollution becomes more and more serious.Air pollution such as haze,acid rain,waste gas makes our living environment quality decline.Automobile exhaust,laboratory organic waste gas,industrial waste gas and so on are pollution sources,among which industrial waste gas is the main source of the pollution.For industrial waste gas treatment,there are also a variety of treatment methods,such as condensation,adsorption,chemical degradation,etc.Due to the addition of chemical additives in the chemical treatment method,the multi-medium catalytic oxidation process will produce harmful wastewater,waste residue and secondary pollution.Therefore,the high voltage power plasma is used to treat the exhaust gas,so that the problem can be solved..When a high voltage is applied,the gas is broken down to produce a mixture of electrons,ions,free radicals,etc.The plasma degrades pollutants by using these active particles,such as high-energy electrons,free radicals,and other active particles,to act on pollutants in waste gas.The pollutant molecules are decomposed in a very short time to achieve the purpose of degradation of pollutants.With the development of semiconductor technology,the design of high voltage power supply tends to be high frequency,integration and energy saving.Combining high voltage power supply with computer technology to realize the intelligence of high voltage power supply Energy control.The high voltage power supply system for plasma waste gas treatment is designed to deal with industrial waste gas and laboratory exhaust gas according to the above characteristics.This paper analyzes the research status of plasma waste gas treatment high voltage power supply in China.Through the research of various plasma high voltage power supply technical schemes,the switching power supply of AC-DC-AC-DC topology circuit for high voltage power supply main circuit is determined.AC-DC adopts full-bridge rectifier;DC-DC adopts power factor correction circuit with BOOST structure,and its control chip uses L6562A;The DC-AC-DC link adopts the PWM full-bridge inverter circuit and the multi-stage voltage doubling rectifier circuit,and the inverter link switch tube control chip uses the SG3525,IR2110 chip,carries on the stable voltage control.Design and build the loop.The multi-output auxiliary power supply is designed with single-end flyback with transformer isolation,the PWM control chip is regulated by UC3842 to realize voltage stabilization,and the controller adopts STM32F103ZET6 microprocessor to regulate thevoltage and on-off of power supply.In order to multiplex control,this control mode and remote control mode are designed.This control mode is that the local configuration screen or local PC adopts the ModBus communication protocol based on RS₄85 to communicate with the high voltage power supply equipment to carry on the field control.Remote control mode is remote computer PC or mobile phone PC using TCP / IP communication protocol is connected to the server and then connected to the high voltage power supply equipment for remote control.The upper computer of mobile phone adopts the power operation interface written by E4 A,and the upper computer of the computer adopts the interface of power supply of LabVIEW.According to the whole design scheme,the circuit diagram is built,and the circuit parameters of each function module are calculated.After the hardware is finished,the design of the software host computer is also carefully programmed,and the software is successfully tested and applied to the high voltage power supply.Conduct comprehensive design and comprehensive analysis.Finally,a prototype equipment is designed,and the core parameters of the device are tested systematically.The test indexes meet the design requirements and reach the expected design value.