WIRELESS INDUCTIVE POWER TRANSFER

• US 20160149440A1
• Filed: 07/15/2014
• Published: 05/26/2016
• Est. Priority Date: 07/17/2013
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Staring, Antonius Adriaan Maria, Van Wageningen, Andries
• Granted Patent: US 10,615,646 B2
• Time in Patent Office: Days
• CPC Class Codes: G01V 3/10 using induction coils
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A wireless power transfer system includes a power transmitter (101) arranged to provide a power transfer to a power receiver (105) via a wireless inductive power signal. A parasitic power loss detector (207) is arranged to detect a parasitic power loss for the power transfer, and a user indicator (209) is arranged to initialize a user alert in response to the detection of the parasitic power loss. The system comprises an input (211) for receiving user inputs; and a controller (213) which is arranged to initiate an adaptation of a parasitic power loss detection operation performed by the parasitic power loss detector (207) to detect parasitic power losses if a user input meeting a criterion is not received. Each of the individual features may be implemented in the power transmitter (101), the power receiver (105), or may e.g. be distributed between these. The approach may allow improved foreign object detection in a wireless power transfer system.

Claims

1. A wireless power transfer system including a power transmitter arranged to provide a power transfer to a power receiver via a wireless inductive power signal, the wireless power transfer system comprising:

a parasitic power loss detector arranged to perform a parasitic power loss detection operation to generate a parasitic power loss detection for the power transfer if a parasitic power loss estimate is outside a range;

a user indicator for initializing a user alert in response to the parasitic power loss detection;

an input for, in response to the parasitic power loss detection, receiving a user input indicating a presence of a foreign object or an absence of a foreign object; and

a controller arranged to initiate an adaptation of a parasitic power loss detection operation performed by the parasitic power loss detector to generate the parasitic power loss detection if the user input indicates an absence of a foreign object, and to not initiate the adaptation of the parasitic power loss detection operation if the user input indicates a presence of a foreign object, the adaptation comprising a modification of a parameter of the parasitic power loss detection operation.

2. The wireless power transfer system of claim 1 wherein the parasitic power loss detector is arranged to generate the parasitic power loss detection if the parasitic power loss estimate has a value above an upper value of the range.

3. The wireless power transfer system of claim 1 wherein the parasitic power loss detector is arranged to generate the parasitic power loss estimate from a power loss estimate model and to compare it to the range, and the wireless power transfer system comprises an adaptor for performing the adaptation, the adaptor being arranged to modify at least one of a parameter of the model for determining the parasitic power loss estimate and the range.

4. The wireless power transfer system of claim 1 wherein the input is at least partially comprised in the power receiver.

5. The wireless power transfer system of claim 1 wherein the parasitic power loss detector is at least partially comprised in the power transmitter.

6. The wireless power transfer system of claim 1 wherein the parasitic power loss detector is at least partially comprised in the power receiver, and the power transmitter comprises a power estimator for generating a transmit power estimate for the power signal and a transmitter for transmitting the transmit power estimate to the power receiver, the power receiver comprises a receiver for receiving the transmit power estimate, and the parasitic power loss detector is arranged to generate the parasitic power loss detection based on the transmit power estimate.

7. An apparatus for a wireless power transfer system including a power transmitter arranged to provide a power transfer to a power receiver via a wireless inductive power signal, the apparatus comprising:

a parasitic power loss detector arranged to perform a parasitic power loss detection operation to generate a parasitic power loss detection for the power transfer if a parasitic power loss estimate is outside a range;

a user indicator for initializing a user alert in response to the parasitic power loss detection;

an input for, in response to the parasitic power loss detection, receiving a user input indicating a presence of a foreign object or an absence of a foreign object; and

a controller arranged to initiate an adaptation of a parasitic power loss detection operation performed by the parasitic power loss detector to generate the parasitic power loss detection if the user input indicates an absence of a foreign object, and to not initiate the adaptation of the parasitic power loss detection operation if the user input indicates a presence of a foreign object, the adaptation comprising a modification of a parameter of the parasitic power loss detection operation.

8. The apparatus of claim 7 further comprising an adaptor for performing the adaptation, the adaptor being arranged to set parameters for the power loss detection operation based on multiple initiated adaptations.

9. The apparatus of claim 8 wherein the adaptor is arranged to adapt at least one of a model for determining the parasitic power loss estimate and the range based on multiple initiated adaptations.

10. The apparatus of claim 9 wherein the adaptor is arranged to modify at least one of the model for determining the parasitic power loss estimate and the range to bias a combined parasitic loss estimate for the multiple initiated adaptations towards a predetermined position in the range.

11. The apparatus of claim 9 wherein the adaptor is arranged to adapt at least one of a model for determining a transmit power estimate for the power transmitter, a model for determining a power receive estimate for the power receiver, and at least one end-point of the range.

12. The apparatus of claim 8 wherein the adaptor is arranged to set parameters for the parasitic power loss detection operation for individual pairings of a power transmitter and a power receiver.

13. The apparatus of claim 8 wherein the apparatus is the power transmitter and the adaptor is arranged to determine at least one compensation parameter of the parameters for the parasitic power loss detection operation based on initiated adaptations for a plurality of power receivers.

14. The apparatus of claim 8 wherein apparatus is the power receiver and the adaptor is arranged to determine at least one parameter of the parameters for the parasitic power loss detection based on initiated adaptations for a plurality of power transmitters.

15. The apparatus of claim 7 wherein the controller is arranged to initiate the adaptation only if the user input comprises an indication of a user confirmation of a suitable positioning of the power receiver for power transfer.

16. The apparatus of claim 7 wherein the apparatus is the power receiver.

17. The apparatus of claim 16 wherein the parasitic power loss detector is arranged to generate the parasitic power loss detection based on a power loss indicator received from the power transmitter.

18. The apparatus of claim 16 wherein the parasitic power loss detector is arranged to generate the parasitic power loss detection in response to a lack of an acknowledgement for a message transmitted to the power transmitter by the power receiver.

19. The apparatus of claim 16 wherein the parasitic power loss detector is arranged to generate the parasitic power loss detection based on a comparison of a transmit power measure received from the power transmitter and a receive power estimate indicative of a power extracted from the power signal by the power receiver.

20. The apparatus of claim 16 wherein the controller is arranged to transmit an adaptation request message to the power transmitter in response to a user input indicating an absence of the foreign object being received.

21. The apparatus of claim 7 wherein the apparatus is the power transmitter.

22. The apparatus of claim 21 wherein the user indicator is arranged to initialize the user alert by transmitting a user alert request message to the power receiver the user alert request message requesting that the power receiver generates a user alert.

23-31. -31. (canceled)

32. A method of operation for a wireless power transfer system including a power transmitter arranged to provide a power transfer to a power receiver via a wireless inductive power signal, the method comprising:

performing a parasitic power loss detection operation to generate a parasitic power loss detection for the power transfer if a parasitic power loss estimate is outside a range;

initializing a user alert in response to the parasitic power loss detection;

receiving a user input in response to the parasitic power loss detection, the user input indicating a presence of a foreign object or an absence of a foreign object; and

initiating an adaptation of a parasitic power loss detection algorithm to generate parasitic power losses if the user input indicates an absence of a foreign object, and not initiating the adaptation of the parasitic power loss detection operation if the user input indicates a presence of a foreign object, the adaptation comprising a modification of a parameter of the parasitic power loss detection operation.