Isolated Orthogonal Magnetic Energy Harvesting System Around High Voltage Transmission Lines

It is practically challenging for the output power in the magnetic field energy harvesting systems around high-voltage transmission lines. Consequently, a system of isolated orthogonal magnetic energy harvesting is proposed, which is consisted of two mutually orthogonal magnetic field energy harvesting modules and subsequent rectification circuits. According to the magnetic field distribution around the power transmission lines based on the catenary model at an existing 500 kV double circuit transmission tower, an H-type magnetic field energy harvesting module is designed based on the isolated magnetic field energy harvesting principle. Through two H-type magnetic energy harvesters, the energy is harvested and converted into voltage. The corresponding voltage is connected in series to power the load after being rectified respectively by the Cockcroft–Walton voltage multiplier circuit. Compared with the existing harvesting modules, the output power of the H-type magnetic field energy harvesting module is significantly improved in the condition of the same external magnetic flux density. The system proposed is modeled and analyzed, then a prototype was designed. The experimental results show that the DC output power of the system can reach up to 13 mW in an environment with an external magnetic flux density of 18 μ T. And the correctness and feasibility of the system of isolated orthogonal magnetic field energy harvesting are verified.