A high power charging power supply for capacitor in pulsed power system

Abstract

High pulsed magnetic field, particle accelerator, strong laser, electromagnetic emission and other pulsed power systems require energy provided by fast charging capacitor with short duration and high density. It is necessary to recharge the capacitor to specific voltage by charging power supply after the discharge of energy stored in the capacitor. Charging power supply applied in high power capacitive pulsed system has the characteristics of high voltage, large charging current and high efficiency, and such characteristics provide opportunities and challenges to its research and development. At Wuhan National Magnetic Field Center, a scheme of high power charging power supply applied in capacitive pulsed power system for high pulsed magnetic field is proposed with parameters of 15 kV rated voltage, 770 A maximum current and 8.3 MW peak power. Multiple BUCK circuit topology is employed to reduce charging current ripple and each BUCK circuit operates reliably in discontinuous continuous current mode to eliminate the overvoltage caused by reverse recovery of freewheeling diode. Simulation model of the designed charging power supply is established that simulation result shows the validity and feasibility of the scheme.