High-bandwidth magnet power supply for iron core corrector in Taiwan Photon Source

Abstract

Taiwan Photon Source (TPS) has been operated for 6 years, and the mean time between fails has reached world-class standards since the first light was delivered on 31 December 2013. To maintain satisfactory research facilities, all subsystems are constantly updating their equipment. The power supply group dramatically increases the output current bandwidth on bipolar corrector magnet power supplies, thereby increasing the number of calculations of the fast orbit feedback system and improving the stability of beam current. Finally, a DC/DC high-bandwidth corrector was built in the laboratory with the maximum prototype output current and voltage of 10 A/40 V. The power switch is metal-oxide-semiconductor field-effect transistor (MOSFET,) and the power state is a full-bridge (H-Bridge) circuit with a 145 kHz signal. The effectiveness of the control loop design can be verified from the gain margin and output current ripple. The prototype achieved a 11 kHz bandwidth with less than 3 dB attenuation for a reference signal of 0.1 V (equal to 0.1 A). Finally, a hardware prototype circuit was constructed in a power group laboratory. It had an input voltage of 48 V, output current of 10 A and maximum power of 400 W.