Performance of a DSP based phase-shifted PWM controlled, zero-voltage-switching direct-current regulated magnet power supply

In this paper, a power supply being used for powering quadrupole magnets of a 2.5 GeV synchrotron machine is discussed. Main focus is on the implementation of a digital control of the power supply using a digital signal processor (DSP), TMS320F2812 from TI. The control system is designed to regulate the magnet current against the variations of line-voltage, load-impedance and other parameters. The power circuit consists of an AC-DC converter followed by a DC-DC converter based on zero-voltage-switched (ZVS) high frequency inverter driven by phase-shifted pulses. The paper describes the power circuit, digital implementation of various control-loops, computer simulation and design of control loops, and finally, the simulation results along with the results achieved from the actual system