Research on high bandwidth power supply

Background Fourth-generation photon sources like Free Electron Lasers (FEL) and Diffraction-Limited Storage Rings (DLSR) have high requirements for beam emittance. In the case of DLSR sources, a set of high-performance fast orbit feedback system (FOFB) is needed to correct the beam orbit quickly and accurately.
Purpose FOFB system has four key components, which is BPM, orbit feedback calculation, fast correction magnet and fast corrector power supply. The FOFB gives the correction command and controls the fast corrector power supply to drive the fast correction magnet to correct the beam quickly and accurately. The corrector power supply has an important impact on the performance of FOFB. The corrector power supply needs to have high bandwidth and low output current ripple.
Methods The new GaN power device is used to solve the restriction of the high-speed switching. The switching frequency of the power supply is increased to 300 kHz. The control system is designed to improve the bandwidth and optimize the output current ripple. The modeling analysis of the key parts of the system is given and the simulation experiments are carried out with MATLAB.
Results and conclusion The test results showed that bandwidth of the designed power supply is 20 kHz. The step response time is 18us and output current ripple is lower than 1 mA.