Experimental investigation of near-field magnetic energy harvesting from induction cooktop

Abstract

This paper proposes a simple and cost-effective magnetic-field-energy harvesting circuit for capturing the leaked magnetic energy from an induction cooktop. In this, the captured energy is converted into dc electrical energy with the help of 1N5819 Schottky diodes based full wave bridge rectifier. We investigated the captured magnetic-field energy at different positions and different heights of the energy-harvesting coil from the induction cooktop. The designed Magnetic-Field-Energy Harvesting (MFEH) circuit is capable of capturing an average dc power of 1484 mW while it is placed 5 cm below the induction cooktop with a load resister 33 Ω and capacitance of 470 μF. The power level is reduced to 203 mW when the energy harvesting coil is moved to 10 cm below the induction cooktop. The harvested magnetic field energy at different positions of the energy harvesting coils is investigated for different values of load resisters. The harvested energy can be stored in a battery for future applications. The proposed device demonstrated practically for charging mobile and powering the low-power IoT device. The numerical study of the proposed harvesting mechanism is explained also. The induction cooktop’s yielded excellent results and magnetic field energy harvesting capability make the proposed device unique from the previously reported magnetic harvesting circuits.