Patent ID: 7155291

Claim:
An energy receiving system for receiving power transferred from a power supply located on a first side of a physical boundary and delivering the power to a variable load located on a second side of the physical boundary, the energy receiving system comprising: a secondary winding electrically coupled to the variable load to provide power to the variable load based on a magnetic field received by the secondary winding, the secondary winding adapted to be disposed on the second side of the physical boundary and for magnetic coupling with a primary winding disposed on the first side of the physical boundary to form a power channel between the windings through which the magnetic field is received by the secondary winding; a secondary control circuit electrically coupled to the secondary winding to provide a detectable indication on the power channel that indicates at least one of changes in the variable load and changes in the relative position of the primary winding and the secondary winding, wherein the detectable indication includes at least one surge on the power channel.