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上海质子治疗装置项目中质子注入系统凸轨磁铁需要脉冲电源励磁,要求两台电源脉冲峰值幅度可调和波形一致,且运行可靠。本文介绍了凸轨磁铁脉冲电源的设计和测试。脉冲电源电路采用LC串联谐振作为脉冲成形发生电路,电路设计可调电感用于调整波形脉宽。晶闸管为电流开关,快恢复二极管串联晶闸管弥补大功率晶闸管的关断延迟和下冲,并增加饱和电抗器抑制励磁电流反向电流尖峰。测试结果表明,当励磁电流峰值为3 732 A时,励磁电流触发抖动小于±25 ns,励磁电流峰值重复稳定度小于0.1%,反向电流尖峰下降为峰值电流的3.75%,快恢复二极管和饱和电感器对抑制励磁电流反冲的效果明显,满足了设计要求。
The proton injection system of the proton magnet in the Shanghai proton therapy device project needs the excitation of the pulse power supply, which requires the peak amplitude of the two power pulses to be adjustable and the waveform to be consistent, and the operation is reliable. This article describes the design and testing of the lunar magnet pulse power supply. The pulse power supply circuit adopts LC series resonance as the pulse shaping circuit, and the circuit design adjustable inductance is used to adjust the waveform pulse width. Thyristor for the current switch, fast recovery diodes in series thyristor thyristor make up to close the delay and undershoot, and increase the saturation reactor to suppress the excitation current reverse current spikes. The test results show that when the excitation current peak is 3 732 A, the excitation current jitter is less than ± 25 ns, the peak repetitive stability of excitation current is less than 0.1%, the reverse current peak is decreased to 3.75% of the peak current, the fast recovery diode and saturation Inductor to suppress excitation current recoil effect is obvious, to meet the design requirements.