Research on power management circuit of magnetic field energy harvesting for wireless sensor

Abstract

In order to solve the power supply problem of wireless sensors in the power cable environment, the changing magnetic field around the cable is used, and the open energy harvesting coil and power management circuit are used to supply power to the sensor. However, improving circuit applicability and output efficiency is the key. For this reason, through the circuit principle and simulation analysis, the basic model of the power management circuit is established, and the overvoltage protection and energy storage unit are designed for the special environment of the cable to solve the problem of circuit protection and energy supply dead zone. Then reduce the circuit loss according to the circuit topology design. Finally, an experimental platform is built to verify the output effect of the power management circuit. The voltage induced by the magnetic induction power acquisition module can obtain a stable and reliable output voltage through the power management circuit, which can realize the self-sufficiency of the power supply of the wireless sensor.