Patent Research 11/2/07

Summary of Patent for “INDUCTIVE TOWER TRANSFER SYSTEM HAVING AREAS WITH HORIZONTAL FIELD”
Location:http://v3.espacenet.com/textdes?DB=EPODOC&IDX=GB2399230&F=0&RPN=GB2399229&DOC=ce973ee58c45ffbf7f38f1b17920c7973e&QPN=GB2399229

Physical Description:
Device utilizes two rectangular, perpendicular coils for the primary. Secondary is one or more conductive plates instead of coils. Secondary is backed by ferrous material. Primary charging field encircles charging area (field is parallel to charging surface), instead of a perpendicular field emanating from charging area. Coil 1 & Coil 2 have AC currents that are 90 degrees out of phase to create a “rotating magnetic dipole”.

Primary contains high permeability core to confine field. When a core of higher permeability is introduced, some filed lines will couple with secondary device.

Control Description:

Authors indicate that as devices are added to the charging area the net inductance is changed. Their goal is to allow up to six devices to charge simultaneously. To compensate, they suggest a capacitor bank which will switch-in capacitances to bring the device back to resonance. They theorize that the inductance will change in quantized levels allowing 6, fixed capacitances to be utilized.

Design Concerns:

1. Intensity of electromagnetic emissions is governed by regulatory limits.
2. Heating of nearby objects by magnetic field.