US 12,732,028 B2 · Inductive link coil de-tuning compensation and control

Abstract

An inductive wireless power transfer and communication system includes an electrostatic shield for one of the coils. The electrostatic shield is inductively coupled with the coil and is configured as an open circuit. A signal processing element or elements, especially a modulator or a demodulator, are connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the modulator or demodulator can operate on the signal on the coil. An electronically controlled variable inductor is connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the variable inductor can tune the impedance of the system.

Claims37

Dependent claims

A wireless coupling system comprising:

a first coil, wherein an alternating current is present on the first coil;
a second coil, the second coil being directly inductively coupled to the first coil;
an electrostatic shield for the first coil, wherein the electrostatic shield is inductively coupled to the first coil, the electrostatic shield having a gap extending along an axial length of the electrostatic shield;
a variable impedance element comprising a variable inductor coupled across the gap of the electrostatic shield;
and
a control loop,
wherein the control loop controls an impedance of the variable impedance element based on the alternating current on the first coil to maximize an amplitude of the alternating current on the first coil, and
wherein the control loop is configured to generate a control voltage.

5 more elements

Dependencies are inferred from the claim text.

Inductive link coil de-tuning compensation and control

Life of this patent

Inductive link coil de-tuning compensation and control

Life of this patent

Abstract

Claims37