针对目前国内厂家生产的复费率电能表中普遍存在的电池失压现象，对以超级电容替代电池的方案进行了研究。结合当今低功耗领域内的几项技术，重点解决了备用状态下时钟电路的低功耗问题，实现了电容电压下降至２．５Ｖ时电流消耗低于３００ｎＡ的要求。并且给出了主电源和备用电源之间的切换电路设计方案 Aiming at the current situation of battery voltage loss in the multi-rate watt-hour meter produced by domestic manufacturers, a scheme of replacing the battery with a supercapacitor was studied. Combining with several technologies in the field of low power consumption today, the problem of low power consumption of the clock circuit in the standby state is mainly solved, and the current consumption requirement below 300 nA when the capacitor voltage drops to 2.5 V is achieved. And given the switching circuit design between the main power and standby power supply