一种基于射频主动供能的能量采集电路研究

n impedance transformation network with two resonating circuits is proposed in this paper to improve the power transmission efficiency of wireless sensing system based on RF active power supply since the power transmission efficiency is too low to drive the wireless sensor effectively. The energy loss of the network can be reduced and the maximum power transmission efficiency can be obtained by letting both the primary circuit and the secondary circuit resonate at the same frequency, and matching the impedance between the antenna and the load circuit simultaneously. An instantaneous discharging circuit is used to supply the load with power. Experimental results show that the proposed impedance transformation network can improve the power transmission efficiency between the antenna and the load circuit, and also the charging efficiency of the energy storage circuit. With the use of the instantaneous discharging circuit, the energy stored in the storage capacitor can be released in short time to drive the wireless sensor transceiver node.