| Cold atmospheric plasmas have wide applications in the fields of aerospace,environment,biomedicine,materials surface treatment,disinfection and sterilization,and so on.However,up to now,most CAP generators are driven by high-voltage power supplies with inert gas as the plasma working gas,and thus,with low portability.In order to overcome these problems,a portable plasma generator using air as the plasma working for producing stable CAPs has been developed in this thesis.The main research contents are as follows:1)Design of the CAP discharge cell.Based on analysis of the existing atmospheric pressure dielectric barrier discharge plasma generators,the design of the atmospheric pressure surface dielectric barrier discharge(SDBD)structure with a floating electrode is conducted.The electric field distributions of the plasma generators under different types and thicknesses of the dielectric layers are calculated using the software of Ansys.This is helpful for optimizing the geometrical configuration of the SDBD plasma generators.2)Development of a high voltage power supply used for SDBD plasma generation.This power supply includes the inverter module,the booster module,charge and discharge protection module,and current feedback module.The single tube shock topology is used to construct the booster main circuit,while the output current feedback circuit is employed based on Hall elements.3)An equivalent circuit model is established including the developed SDBD cell and the human body.The coupling effects of power supply-plasma-human body are studied using the software of SIMULINK with different configurations and thicknesses of the dielectric layers.This device can produce stable air CAPs with a DC power input of 3-12 V and output current less than 10 m A,a stable air plasma can be produced continuously without and electric shocks and burning sensation.The preceding work provides a good platform for developing plasma biomedicine applications in the future.Figure 39;Table 2;Reference 81;... |
PDF Full Text Request