Study On High-Power Spiral Strip Pulse Transformer

High-power pulse transformer has excellent performances in high power capacity,small bulk and simple structure. So it opens up extensive applications in the pulse power fields. The transformer system with storage capacities is often used in intense electron beam accelerator to substitute traditional Marx generator. For the air-core pulse transformer has no magnetic material to form the magnetic loop, its coupling coefficient and energy efficiency is lower. In order to improve its property, partial magnetic material is inserted in air-core spiral strip transformer. This method not only results in better property of transformer, but also reduces the bulk of transformer. The research on part-magnetic-core pulse transformer has an important meaning in transformer's manufacture and design. The effect of the magnetic material on transformer's performance is studied in the theme.The change of transformer's output voltage with coupling coefficient is analyzed. The calculated formulas for parameters of air-core and part-magnetic-core pulse transformer are deduced based on electromagnetic theory. Comparing with past formulas for calculated the parameters of the transformer, this formulas is more accurate to reckon the parameters of transformer. But the methods to calculate the parameters of partial magnetic core pulse transformer are simple and imperfect. It will be further improved in the future.The charge circuit with a pulse transformer is simulated using Pspice. According to the simulated results, the parameters of loop making the influences on transformer's output voltage are analyzed, and suited transformer's parameters are selected depending on the analytic result. On the base of comparing many kinds magnetic material, the amorphous iron material is acted as magnetic core of high power spiral strip pulse transformer. The distributions of electromagnetic field inside the transformer are simulated using ANSYS. According to simulated result, the cylindrical magnetic core is used in the air-core spiral strip pulse transformer. In the end, the part-magnetic-core pulse transformer is constructed with primary inductance 3.14μH, second inductance 298.89μH and coupling coefficient 0.873. Compared with the air-core spiral strip pulse transformer of the same dimension, the coupling coefficient is increased by 13.4 percent. This transformer is used to charge for water capacitor. The output voltage of transformer is up to 635kV in the experiment. The property of the transformer is satisfied with the request of experiment and design. The methods have guidance on designing transformer. Moreover, the frequency response of the transformer was theoretically analyzed and practically tested.