基于超级电容的智能电能表长寿命后备电源设计

Design of long-life backup power supply for smart meter based on super capacitor

智能电能表的进一步发展要求在外部供电电源中断后具有一定时间的远程通信能力,以便电能表数据的备份与停电等重要事件上报。作为常规后备电源的电池与电解电容都存在弊端,前者使用寿命较低,后者容量太小。文章首先用超级电容寿命估计理论论述了满足新一代电能表16年设计寿命的可行性,给出了满足寿命要求的超级电容备用电源充电电路设计,并解决了储能电容的待机能力,最后针对微功耗电路难以用常规仪器测量的现实,使用Spice模拟电路仿真工具分析了电路功能,并进行了实际电路试验,验证了电路方案的可行性。文章对市电供电的智能互联仪表设备的备用电源设计具有一定的借鉴意义。

The further development of smart meters requires a certain period of long-distance communication capability after the interruption of external power supply,so as to backup the meter data and report the important events such as power failure.As a conventional backup power supply,both battery and electrolytic capacitor have disadvantages.The former has low service life,while the latter has too small capacity.This paper first discusses the feasibility of meeting the 16 years design life of the new generation smart meter by using the life estimation theory of super capacitor,gives the charging circuit design of super capacitor backup power supply to meet the life requirements,and solves the standby capacity of energy storage capacitor.Finally,aiming at the reality that the micro-power consumption circuit is difficult to be measured by conventional instruments,the circuit function is analyzed by using Spice analog circuit simulation tool and the actual circuit test is carried out to verify the feasibility of the circuit scheme.This paper has certain reference significance for the design of backup power supply of intelligent interconnected instrument equipment.