Apparatus, system, and method for detecting a foreign object in an inductive wireless power transfer system
AssigneeIntegrated Device Technology, Inc.
InventorSiamak Bastami
Life of this patent
Estimating the term…
Abstract
An inductive wireless power transfer system comprises a transmitter configured to generate an electromagnetic field to a coupling region in response to an input signal. The inductive wireless power transfer control logic is configured to determine an input power of the input signal. The control logic is configured to determine a presence of a foreign object within the coupling region in response to a comparison of the input power and an output power of an output signal of a receiver within the coupling region. Related inductive wireless power transfer systems and methods for detecting a foreign object in an inductive wireless power transfer coupling region of an inductive wireless power transfer system are disclosed.
Claims21
An inductive wireless power transfer device, comprising:
- a transmitter configured to generate an electromagnetic field to a coupling region in response to an input signal;
- and
- control logic configured to determine an input power of the input signal, wherein the control logic is configured to determine a presence of a foreign object within the coupling region in response to a comparison of the input power and an output power of an output signal of a receiver within the coupling region.
An inductive wireless power transfer system, comprising:
- a wireless power transmitting apparatus configured to generate an electromagnetic field in a coupling region for wireless power transfer;
- and
- a wireless power receiving apparatus configured to couple with the electromagnetic field and generate an output signal in response thereto, wherein at least one of the wireless power transmitting apparatus and the wireless power receiving apparatus is configured to determine a presence of a foreign object within the coupling region based, at least in part, on monitoring an input power of the wireless power transmitting apparatus and an output power of the wireless power receiving apparatus.
A method for detecting a foreign object in an inductive wireless power transfer coupling region of an inductive wireless power transfer system, the method comprising:
- determine input power of a transmitter of an inductive wireless power transfer system;
- determine output power of a receiver of an inductive wireless power transfer system;
- determining a foreign object power loss based, at least in part, on a difference between the input power and the output power;
- and
- determining the presence of a foreign object in an inductive wireless power transfer coupling region when the foreign object power loss is greater than a predetermined threshold.
Dependencies are inferred from the claim text.