This original paper deals with a new approach for the study of behavior in nonlinear regime of a new three-phase high voltage power supply for magnetrons, used for the microwave generators in industrial applications. The design of this system is composed of a new three-phase leakage flux transformer supplying by phase a cell, composed of a capacitor and a diode, which multiplies the voltage and stabilizes the current. Each cell. in turn, supplies a single magnetron. An equivalent model of this transformer is developed taking into account the saturation phenomenon and the stabilization process of each magnetron. Each inductance of the model is characterized by a non linear relation between flux and current. This model was tested by EMTP software near the nominal state. The theoretical results were compared to experimental measurements with a good agreement. Relative to the current device, the new systemprovides gains of size, volume, cost of implementation and maintenance which make it more economical.

The high voltage power supply for magnetron, used for the microwaves generators in industrial applications is a classical design. This system is composed of a single phase leakage flux transformer supplying a cell composed of a capacitor and a diode, which double the voltage and stabilize the current. An improved π quadruple model of this transformer is developed taking into account the saturation phenomena. It is based on a determination of analytic inductances deduced by a new analytic approach of fitting the nonlinear curve B-H. Two parts of this curve are considered for this analytic representation: The linear region is fitted by a non integer power series whereas the saturation region by a polynomial representation. We present a validation of this new model, by MATLAB-SIMULINK ® code at the nominal state, based on the comparison between experimental and simulated currents and voltages. The simulation curves match nearly the experimental measurements. The results from MATLAB-SIMULINK ® of this new model are also compared to the ones from old π model based on introducing a set of points of magnetizing curve using EMTP ® code (Electromagnetic Transient Program).

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