一种RF主动供能无线传感器能量管理电路的研究

Energy density of electromagnetic energy in the surroundings is low, which cannot be used to drive wireless sensors. A RF active powered wireless sensor is proposed in the article. The mutual inductance dual tuned rectifier circuit adopted in the article achieves resonance state with the Q value 16 and efficiency up to 33% when the frequency of input electromagnetic wave is 447MHz. When the communication distance is 5.6m and input power is -13 dBm, the voltage across energy storage capacitor can reach 0.7V. The energy stored in the capacitor is discharged by the instaneous discharging circuit, improving the energy utilization rate and level of driving capacity. Experimental results show that when the voltage across the energy storage capacitor of 4700uF is 0.7V, the proposed circuit can drive the wireless sensor whose maximum power consumption is 28mW successfully with the efficiency achieving40%.