非隔离型防电流反灌技术在宇航领域中的研究与应用  

Research on Non-isolated Anti-current Backflow Technology in Aerospace Field and Its Application

作　　者：汪超[1] 王邦兴 王涵 葛科勇 史传洲 WANG Chao;WANG Bangxing;WANG Han

机构地区：[1]上海空间电源研究所,上海200245

出　　处：《科技创新与应用》2022年第25期75-79,84,共6页Technology Innovation and Application

摘　　要：同步整流模式控制的Buck变换器虽然提高了系统的工作效率,但是也带来了电流反灌现象,这种情况严重影响航天器二次电源系统的效率、寿命、安全性和可靠性。针对这一问题,该文设计并实现基于Buck电路的防电流反灌电路,该电路通过逐周期检测低端Mos管关断后,高端Mos管开通前这一死区时间内低端Mos管Vds电压的高低电平状态,来判断电路处于何种工作模式,进而控制低端Mos管的驱动电压,实现当电路处于强制电流连续模式(FCCM,Forced Current Continuous Mode)时,关断低端Mos管驱动的控制逻辑功能。仿真和实验结果表明,加入该防电流反灌电路后,可有效防止电流反灌现象,提高电路的可靠性和稳定性。Although the Buck converter controlled by synchronous rectification mode improves the working efficiency of the system, it also brings current backflow, which seriously affects the efficiency, life, safety and reliability of the spacecraft DC-DC power supply system. In order to solve this problem, an anti-current backflow circuit based on Buck circuit is designed and implemented in this paper. The circuit determines the working mode of the circuit by periodically detecting the high and low Vdsvoltage of the low-end Mos transistor after the low-end Mos transistor is turned off and before the high-end Mos transistor is turned on, and then controls the driving voltage of the low-end Mos transistor, thus realizing the control logic function of turning off thelow-end Mos tube drive when the circuit is in the forced current continuous mode(FCCM). The simulation and experimental results show that adding the anti-current backflow circuit can effectively prevent the current backflow phenomenon and improve the reliability and stability of the circuit.

关 键 词：电流反灌 同步整流 非隔离型DC-DC 航天器二次电源 宇航领域 

分 类 号：TM46[电气工程—电器]