Development of a 1 MW, 0.44 MHz High Frequency Power Supply for Industrial Applications

The article is focused on the development of a single-circuit vacuum tube generator 1 MW, 0.44 MHz with self-excitation which can be used for industrial applications, for example as a power source for generation of a radio-frequency induction plasma of high-enthalpy gases (air, nitrogen, etc.). A generator model in soft Matlab Simulink has been created. The vacuum tube GU-98A which produced by industry was chosen as the main element of the generator. The nonlinear characteristics of the vacuum tube (namely, the dependences of the anode current and the grid current on the anode and grid voltages) were approximated by analytical functions. The generator load which is an inductor with plasma was represented in the generator circuit as an active-inductive element with constant parameters. The article presents the parameters of effective operating modes of the tube generator and recommendations for the selection of its main elements.