Apparatus, system, and method for back-channel communication in an inductive wireless power transfer system

Patent metadata

Field	Value
Publication number	US-8942624-B2
Application number	US-201213436135-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Mar 30, 2012
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

An inductive wireless power transfer device comprises a transmitter that comprises a transmit coil configured to generate a wireless power signal to a coupling region in response to an input voltage, and a modulator configured to modulate the wireless power signal and encode data with the wireless power signal to establish a back-channel communication link from the transmitter to a receiver. An inductive wireless power receiving device comprises a receiver that comprises a receive coil configured to generate a time varying signal in response to receiving a modulated wireless power signal from a transmitter in a coupling region, and a demodulator configured to demodulate the modulated wireless power signal from an established back-channel communication link from the transmitter to a receiver. Related inductive wireless power transfer systems and methods for back-channel communication from the transmitter to the receiver of an inductive wireless power transfer system are disclosed.

First claim

What is claimed is:

1. An inductive wireless power transfer device, comprising:
a transmitter, comprising:
a transmit coil configured to generate a wireless power signal to a coupling region in response to an input voltage;
a modulator configured to modulate the wireless power signal and encode data with the wireless power signal to establish a back-channel communication link from the transmitter to a receiver, and is configured to increase the control characteristic from a baseline level to be a logic ‘1’ bit, and decrease the control of the control characteristic from the baseline level to be a logic ‘0’ bit; and
an inverter configured to generate a time varying current through the transmit coil having a frequency for the wireless power signal, and wherein the inverter includes a switch network controlled by a processor according to a switching frequency, wherein the modulator is configured to adjust a control characteristic of the inverter to modulate the wireless power signal.

2. The inductive wireless power transfer device of claim 1 , wherein the control characteristic a switching frequency of the switch network.

Assignees

• Singh Manjit
• Bastami Siamak
• Wilson David
• Integrated Device Tech

Inventors

• Singh Manjit
• Bastami Siamak
• Wilson David

Classifications

• H02J50/10

  using inductive coupling · CPC title

• H02J50/60

  responsive to the presence of foreign objects, e.g. detection of living beings · CPC title

• H02J50/20

  using microwaves or radio frequency waves · CPC title

• H04B5/79 Primary

  for data transfer in combination with power transfer · CPC title

• H04B5/45

  Transponders · CPC title