650-kJ power supply for one-second highly-stable magnetic field source

• Main Authors: Grishin, D.M., Gubanov, V.P., Gunin, A.V., Korovin, S.D., Stepchenko, A.S.
• Format: Conference Proceeding
• Language: English
• Subjects: Capacitors; Magnetic fields; Magnetic switching; Power supplies; Pulse width modulation; Pulsed power supplies; Solenoids; Steady-state; Superconductivity; Voltage
• DOI: 10.1109/PPPS.2001.961293

Summary form only given, as follows. Producing HPM emission at high pulse repetition rates requires strong magnetic fields, which commonly employs superconductive systems. Realizing batch high rep-rate regimes allows utilization of quasi steady-state magnetic fields using capacitive energy stores. Molecular capacitors storing as much as /spl sim/3.8 J/cm/sup 3/ are most suitable for this purpose. The paper presents a fully controllable power source for a one-second solenoid storing 650 kJ. The store consists of 12 molecular capacitors connected serially in four stages. The total store capacity is 3.45 F and its output voltage is 600 V. The bank charge is made by four independent 10-A DC sources and it takes less than four minutes. When forming the magnetic field pulse, the solenoid is switched onto the energy store via a pulsed stabilizer of a current based on isolated gate bipolar transistors (IGBTs). Controlling the transistors from a PWM-controller with solenoid current feedback allows a decrease in the magnetic field less than 5% while the capacitor bank voltage drops from 600 to 300 V. The maximum current of the solenoid is 1.2 kA. Thus, using the pulsed current stabilizer allows useful consumption of up to 75% of the capacitor bank stored energy.