基于双闭环控制技术的开关直流稳流电源

A DC stabilized current supply based on double closed-loop control technique with PS-FB converter

应用双闭环反馈控制技术,改善系统的动态性能,提高输出精度,设计了一台120A/95V的直流稳流电源,它由UC3875管理,工作频率为25 kHz.电源的输出电流精度好于1×10-5,且稳定性好、瞬态响应快.

In design of a DC stabilized 120A/95V current supply, the double closed-loop control technique was employed to enhance the dynamic behavior of the system and to improve output precision. The internal voltage loop was used to regulate output voltage, whereas the external current loop was used to regulate the output current. Two advance-delay compensation nets were devised for every loop. A UC3875 chip operating at 25 kHz was used to manage the power supply. Theoretical analysis was conducted, and experimental results are shown for the power supply.