Dynamic control of wireless power for a variable load

1 . A method for dynamic power control by a wireless power transmission apparatus, comprising:

receiving, from a wireless power reception apparatus, configuration data in a single message prior to a power transfer phase, the configuration data including a plurality of reference control parameters for a plurality of corresponding reference load states of the wireless power reception apparatus, wherein each reference load state represents a different load voltage and load power setting of the wireless power reception apparatus;

receiving, from the wireless power reception apparatus, a load state of the wireless power reception apparatus, wherein the load state refers to a matching reference load state of the plurality of corresponding reference load states; and

transmitting wireless power to the wireless power reception apparatus using an operating control parameter that is based, at least in part, on the plurality of reference control parameters for the matching reference load state.

2 . The method of claim 1 , further comprising:

receiving, from the wireless power reception apparatus, information indicating a change to a different load state of the plurality of corresponding reference load states; and

modifying the operating control parameter based, at least in part, on the plurality of reference control parameters for a corresponding reference load state that matches the different load state.

3 . The method of claim 2 ,

wherein the receiving the information indicating the change to the different load state occurs before the change; and

wherein the modifying the operating control parameter includes:

waiting until a synchronization event that corresponds to when the change will occur, and

modifying the operating control parameter for wireless power transmission at a time of the synchronization event in coordination with the change to the different load state.

4 . The method of claim 1 , further comprising, before the transmitting the wireless power:

determining an estimated operating parameter, the estimated operating parameter being an output of an estimator unit, wherein inputs to the estimator unit include at least the configuration data, the load state, and a reference voltage; and

determining the operating control parameter based on the estimated operating parameter combined with a feedback parameter.

5 . The method of claim 4 ,

wherein the configuration data includes a starting control parameter and a control parameter limit; and

wherein the estimated operating parameter is based, at least in part, on the starting control parameter and the estimated operating parameter is at or above the control parameter limit.

6 . The method of claim 4 ,

wherein the configuration data includes a reference coupling factor (K-factor) for each combination of the plurality of reference control parameters associated with the plurality of reference load states, and

wherein determining the estimated operating parameter includes:

determining an operating K-factor between the wireless power reception apparatus and the wireless power transmission apparatus;

selecting a particular reference control parameter from the configuration data based on a particular reference load state matching the load state and a particular reference K-factor matching or approximating the operating K-factor; and

determining the estimated operating parameter based, at least in part, on the particular reference control parameter.

7 . The method of claim 1 , further comprising:

receiving one or more feedback messages from the wireless power reception apparatus during one or more corresponding feedback slots, wherein at least one feedback message includes a load state field indicating the load state and a data field indicating a load power.

8 . The method of claim 7 , wherein the at least one feedback message includes a header field and at least one other data field for indicating at least one member of a group consisting of

a reference voltage associated with the load state of the load,

a voltage measured at the secondary coil for determining an operating K-factor,

a fault status, and

an indication of a foreign object detected by the wireless power reception apparatus.

9 . The method of claim 7 , wherein the at least one feedback message includes a checksum field.

10 . The method of claim 1 , wherein the operating control parameter is further based on the configuration data and wherein the configuration data includes one or more fields indicating:

a control indicator indicating a control type of the wireless power reception apparatus,

an indication of a rated appliance voltage,

an indication of a rated appliance power,

an indication of a distance from a secondary coil of the wireless power reception apparatus and an interface surface of the wireless power reception apparatus,

a number of receiver coil turns associated with the secondary coil,

an indication of a free air inductance of the secondary coil,

an indication of a resonance capacitance of the secondary coil, or

an estimator data size field.

11 . A method for dynamic power control performed by a wireless power reception apparatus, comprising:

transmitting, to a wireless power transmission apparatus, configuration data plurality of corresponding reference load states in a single message prior to a power transfer phase, the configuration data including a plurality of reference control parameters for a plurality of corresponding reference load states of the wireless power reception apparatus, wherein each reference load state represents a different load voltage and load power setting of the wireless power reception apparatus;

transmitting, to the wireless power transmission apparatus, a load state of the wireless power reception apparatus, wherein the load state refers to a matching reference load state of the plurality of corresponding reference load states; and

receiving wireless power from the wireless power transmission apparatus that is based, at least in part, on the plurality of reference control parameters for the matching reference load state.

12 . The method of claim 11 , further comprising:

transmitting, to the wireless power transmission apparatus, information indicating a change to a different load state of the plurality of corresponding reference load states during reception of the wireless power, wherein the information causes the wireless power transmission apparatus to modify an operating control parameter associated with the wireless power.

13 . The method of claim 12 , further comprising:

making the change to the different load state at a time of a synchronization event that synchronizes the change to the different load state with a change to the wireless power.

14 . The method of claim 11 , further comprising: transmitting one or more feedback messages to the wireless power transmission apparatus during one or more corresponding feedback slots, wherein at least one feedback message includes a load state field indicating the load state and a data field indicating a load power.

15 . The method of claim 11 , wherein an operating control parameter is further based on the configuration data and wherein the configuration data includes one or more fields indicating:

a control indicator indicating a control type of the wireless power reception apparatus,

an indication of a rated appliance voltage,

an indication of a rated appliance power,

an indication of a distance from a secondary coil of the wireless power reception apparatus and an interface surface of the wireless power reception apparatus,

a number of receiver coil turns associated with the secondary coil,

an indication of a free air inductance of the secondary coil,

an indication of a resonance capacitance of the secondary coil, or

an estimator data size field.

16 . The method of claim 11 , further comprising:

determining that the load is idle or off; and

transmitting feedback information with a load state value indicating the load state is idle or off to cause the wireless power transmission apparatus to discontinue transmission of the wireless power.

17 . A wireless power transmission apparatus, comprising:

a communication unit to:

receive, from a wireless power reception apparatus, configuration data in a single message prior to a power transfer phase, the configuration data including a plurality of more reference control parameters for a plurality of corresponding reference load states of the wireless power reception apparatus, wherein each reference load state represents a different load voltage and load power setting of the wireless power reception apparatus, and

receive, from the wireless power reception apparatus, a load state of the wireless power reception apparatus, wherein the load state refers to a matching reference load state of the plurality of corresponding reference load states;

a primary coil to transmit wireless power to the wireless power reception apparatus using an operating control parameter; and

a controller to control the operating control parameter based, at least in part, on the plurality of reference control parameters for the matching reference load state.

18 . The wireless power transmission apparatus of claim 17 , further comprising:

the communication unit to receive, from the wireless power reception apparatus, information indicating a change to a different load state of the plurality of corresponding reference load states; and

the controller to modify the operating control parameter based, at least in part, on the plurality of reference control parameters for a corresponding reference load state that matches the different load state.

19 . The wireless power transmission apparatus of claim 18 ,

wherein the controller changes the operating control parameter at a time of a synchronization event that synchronizes the modifying with the change to the different load state.