Design of programmable pulsed high power supply for China spallation neutron source

The injection system for the China Spallation Neutron Source (CSNS) rapid cycling synchrotron (RCS) needs two pulsed power supplies bump horizontal power supply (BHPS) and bump vertical power supply (BVPS) to eight painting bump magnets, both of which are programmable pulsed high power supplies. The prototype of the power supplies has been developed. It adopted the insulated gate bipolar transistor (IGBT) H-bridge configuration in a series and parallel topology and phase shifted operating mode in the main circuit, and could output a high power of about 60 MW( 3.319 kV, 18 kA) with the equivalent frequency of IGBT topology of 1.8432 MHz. The problem of average voltage and current in the IGBT has been solved. The prototype adopted an optimized feedback control strategy to achieve high speed response with a tracking precision of 1.5%. Multiprocessing was employed to eliminate harmonics in the pulse current, and the current transducers in parallel were used to detect the output current. (authors)