Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
A 1.6GeV proton rapid cycle synchrotron (RCS) was designed in the Chinese Spallation Neutron Source (CSNS) Project. The magnet power supply system of the synchrotron drives nine sets of independent 25Hz White Circuit. The output currents of the nine sets of magnet power supply are the DC-biased AC source. The currents (magnetic fields) must meet the requirements of the phase and amplitude accuracy during the accelerator repetition cycle. Because of the advantages of the digital. control technique such as reliability, temperature drift rejection, and high integration and so on, it has been adopted more and more widely in the equipment design. To achieve the rigorous goals such as stability and THD (Total Harmonic Distortion) in the RCS/CSNS magnet power supply system, a digital control scheme will be implemented which will be presented in this paper.