Power supplies dedicated to Dielectric Barrier Discharge devices
Résumé
Numerous industrial applications rely on cold plasmas generated by means of Dielectric Barrier Discharge devices. For the performance and reliability of these applications, the control of the electrical energy injected into the plasma is of prominent importance; it also contributes to the homogeneity of the electrical discharge and to the amount of created excited species. In this scope, we have developed generations of pulsed current power supplies aimed at controlling the energy of the injected pulses. For selected processes (UV generation, by means of excimer lamps and gas treatment, in gas flow applications) the design approach of different topologies and the pitfalls and solutions for their use are presented. The critical impact of the high voltage transformer, through its parasitic parameters, is pointed out, as well as solutions trying to take advantage of them; investigated transformerless solutions are also presented.