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Alimentation sans transformateur pour dispositif de décharge à barrière diélectrique (DBD)

Abstract : This thesis focuses on the development of a dielectric barrier discharge (DBD) transformerless power supply. A DBD can produce cold plasma at atmospheric pressure. This device is a capacitive load, which must be supplied by a high voltage alternative source. This high voltage is classically obtained by amplifying a low level voltage with a step up transformer. In the first part, we show that the parasitic elements of the transformer limit the power transfer to the DBD load. This is why, in a second part, we propose a new topology without step-up transformer. A theoretical study of the converter allows to size our power supply and to deduce the fundamental characteristics of the latter. In our topology, the power switches are directly connected to the high voltage. A few years ago, it was inconceivable to connect directly a transistor to a high level of voltage (5kV), unless using very low frequency switches. Recent progress on semiconductor devices led to the development of transistors and diodes based on silicon carbide (SiC), which are able to hold up to 10kV. This voltage level is compatible with our topology.In the third part, we focus on the realization of our transformerless power supply and its operation. Our power supply based on 10 kV SiC semiconductors can ignite the discharge; however the parasitic capacitance and particularly those of the switches affect the power transfer. The role of each one of them is analyzed in detail.In the last part we propose solutions to improve the power delivered by this supply: series connection of lower voltage switches, supplying a high power DBD...
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Submitted on : Tuesday, October 23, 2018 - 3:30:05 PM
Last modification on : Monday, July 4, 2022 - 10:13:29 AM
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  • HAL Id : tel-01902468, version 1



Mame Andallah Diop. Alimentation sans transformateur pour dispositif de décharge à barrière diélectrique (DBD). Plasmas. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30092⟩. ⟨tel-01902468⟩



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