4.8 MJ magnetic field excitation source using pulse width modulation technique

Guiding magnetic fields are necessary for some high-power microwave (HPM) sources, and the usual way to generate them is to apply capacitor discharge to solenoids. In the paper, a power source using the pulse width modulation(PMW) technique is designed, which can drive solenoids to generate a quasi-steady strong magnetic field with certain duration. A 15 F super-capacitor bank with the maximum charge voltage of 800 V, the maximum energy storage of 4.8 MJ and an internal resistance of less than 0.25 Ω is used as the energy storage part of the source. In experiments, when charged to 645 V, the source can generate a quasi-steady current of 900 A with a duration of 1.9 s on a solenoid with 60 mH inductance and 0.40 Ω resistance, and the corresponding axial magnetic field is 2.2 T at the maxi