This study focuses on the development of a fully digital power supply system (FDPSS) for the Taiwan Light Source (TLS) storage ring corrector magnet, which includes the fully digital correction power supply (FDCPS), digital communication card (DCC), and a virtual operation interface. The DCPS adopts a full-bridge circuit architecture, with the TI TMS320F28335 digital signal processor (DSP) as the core, combined with an 18-bit high-resolution A/D converter and discrete PID algorithm to achieve closed-loop current control, ensuring a stable output current value of the system. The DCC can control eight DCPS modules through an RS485 protocol with a virtual instrument control interface. This new system can replace the analog signal-modulated Bira MCOR30A power supply system, which has been in operation for 25 years in the TLS storage ring and can be upgraded to an FDPSS. This article aims to discuss the design concepts, hardware implementation, and testing of FDCPS and DCC to demonstrate the advantages of full digital control and to achieve the goal of independently researching and developing the prototype of FDPSS. Ultimately, after long-term testing and verification, the system's output current stability is less than ± 20ppm, indicating that this new system has high-precision and high-stability output current characteristics. In this study, upgrading the TLS storage ring corrector magnet power supply system to full digital control significantly improves output current stability and accuracy.

The Taiwan Photon Source (TPS) is a widely recognised 3 GeV synchrotron light source. It has demonstrated exceptional performance in average beam downtime and meeting international standards over its successful ten-year operation. Regular equipment updates are conducted for all subsystems to ensure continuous improvement and maintain an optimal research facility environment. This study focuses on designing and implementing a temperature-compensated corrector magnet power supply for the TPS. The power supply incorporates a high-bandwidth, compact, cost-effective, bipolar, and highly precise shunt resistor as the current feedback component. A temperature control copper box and temperature compensation circuit are employed to improve the thermal equilibrium time of the output current. A laboratory-developed TPS-corrected magnet power supply with temperature compensation control has been successfully developed through these measures. The prototype exhibits a maximum output current of 10 A and operates at a voltage of 40 V. Metal-oxide-semiconductor field-effect transistors (MOSFETs) are utilised as the power switch in a full-bridge (H-bridge) configuration with a driving frequency of 40 kHz. The output current ripple is effectively maintained at 100 μA for a 10 A output, and the stabilisation time is achieved within 5 minutes. The control loop design of the prototype has been verified to achieve fast and stable output current performance. The completed prototype demonstrated a -3 dB bandwidth of 2.57 kHz when tested with an input reference signal of 0.1 V. Finally, a hardware prototype circuit was constructed in the power supply laboratory, featuring an input voltage of 48 V, an output current of 10 A, and a maximum power capacity of 400 W.

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For the purpose of lattice optimization, eighteen individual quadrupole power supplies was installed in the SRRC storage ring in March 1997 to replace the three quadrupole family power supplies. In order to accomodate newly installed and already existed power supplies, the control interface of Taiwan Light Source (TLS) has been rejuvenated recently. The new control interface has improved drastically on control speed in comparison with the existed interface. Operation of the power supply system from device level to system level is reorganized to make control and access easier. This new control interface provides capability from complex operation such as lattice file loading, magnet degaussing, to file energy ramping scheme, etc. Performance of this power supply control interface including hardware components and software applications is presented.

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