Graphene inductor harvests power from the magnetic field around a power cable to run a batteryless sensor
Researchers at the University of Arkansas and the University of Michigan have used graphene inductors to harvest power from the alternating magnetic field around a power cable and run a custom, ultra-low-power temperature sensor without a battery or a power-management chip.
The team fabricated two-dimensional spiral and three-dimensional helix graphene inductors and characterized their inductance by measuring current as a function of applied voltage and frequency. They then measured the voltage and current induced in the inductors as a function of the current flowing in a nearby power cable. A single graphene inductor with an inner steel core produced a voltage high enough to activate a Cockcroft-Walton circuit, which passively rectifies the signal and multiplies its amplitude.
Source: https://www.graphene-info.com/graphene-inductor-harvests-power-magnetic-field-around-power-cable-run
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