Aiming at the power-off protection function of distributed control system(DCS),the requirement of maintaining configuration and process data under the condition of power-off is analyzed in this paper.The scheme of standby power supply for lithium batteries and its related technical characteristics,difficulties and applications are compared and analyzed.A set of super-capacitor standby power management plan based on BQ33100 chip is designed.The scheme mainly in-cludes constant current charging,voltage detection,current detection,temperature detection,voltage balance,SMBus serial communication,protection alarm and so on.The ESR and capacitance of super-capacitors are measured by constant cur-rent discharge method,and their health status is calculated.The scheme is applied in ECS-700 system.Tests show that the standby power supply scheme can effectively monitor and manage super-capacitor stacks,provide power-off protection for the system for a long time,and ensure the safety of industrial control site.
关键词
超级电容器/电压均衡/断电保护/ESR/备用电源
Key words
super-capacitor/voltage balance/power-off protection/ESR/standby power
维普
万方数据