An Energy Management Circuit Based on Up-conversion to Power Wireless Sensor Nodes

摘要

This paper presents an up-conversion energy management circuit for harvesting electrical energy induced from the current-carrying electric cord and driving wireless sensor nodes. Since the low frequency signal induced from the electric cord is up-converted into a new one focused on a higher frequency by the management circuit the energy harvesting power of the management circuit can be improved. More energy can be accumulated in the storage capacitor and the charging time can also be improved. It is demonstrated that the maximum energy harvesting efficiency of the management circuit can reach to 91.67%. Under 1 A current through the electric cord circumstances, the energy stored in the storage capacitor can be released to drive a wireless sensor node, whose power consumptions are 18 mW in acquiring data mode (199 ms) and 54 mW in transmitting data mode (1 ms) at a communication distance of 20 m, respectively.