The Research And Design Of Magnet Power Supply Digital Module

The spallation neutron source is an advanced common platfortm for multidisciplinary innovation and high-tech development,they are adapted to the requirement that the hot spot of science transfer to boom subject and interdisciplinarity. The accelerator current magnet power supply system of the Chinese large scientific facility CSNS is composed of linear accelerator that with low energy and rapid cycling synchrotron that with high energy. According to the physics design of the CSNS/RCS ring, it's difficult to achieve with the traditional analog control. Digital control is chosen to be the best scheme of control because of its high reliability,low temperature drift,easy tuning,high integration and good consistency.The digital power supply control module(DPSCM) was designed for accelerator current magnet power supplies with hard switching mode.The field programmable gate array(FPGA) was chosen as the control component for DPSCM.The control of high precision ADC and DAC, the digital regulating loop, and the logic control and interlock protection were implemented in the FPGA. The high precision pulse width modulation(PWM) signals were produced by the DPSCM. Magnet power supply with embedded DPSCM can achieve all-digital control, and achieve high precision DC stabilized power supply output accuracy control needs.The design is to serve the accelerator magnet power supply of the Chinese Spallation Neutron Source project. At first, introducing the main algorithm and principle of the digital control. Then, detailling the hardware design of the mainboard and the AD/DA board, at the same time, detailling the design points and notes of the PCB design from both the reliability and stability. Finally, presentation the results and analysis of the system debugging.The testing results of the DPSCM's mainboard and AD/DA board show that,the module can implement the expected basic function, the performance of certain indicators need to be improved. Now, the module has applied the digital power supply prototype, offering a novel way for the simulation load test.