Design of a wireless power transmission device for underground displacement measurement sensor string

Abstract

A kind of wireless power transmission device is designed to include a total power supply and a plurality of radio energy transmission nodes by means of magnetic coupling resonant radio power transmission technology for the power supply characteristics and requirements of the underground displacement measurement sensor string. Each node includes a coil loop, a micro control unit, a receiver circuit, a transmitter circuit, a switch switching circuit and a wireless communication module. The micro control unit controls the connection of the switch switching coil and the back end circuit according to the instruction received by the communication module. This allows each node to have three operating states, namely, receive status, send status, and relay status. In the experiment, the coil was wound and the transmission characteristics were measured with a network analyzer. Then, the coil is connected with the node circuit to verify the performance of the wireless power transmission device. The result shows that the device is stable and reliable to meet the power supply requirement of the sensor string.

Keywords

• wireless power transmission
• energy storage
• multi-node