Method and apparatus of load detection for a planar wireless power system

Abstract

Described herein are embodiments of a method of determining information regarding power delivered to a high-Q resonator for a planar wireless power transfer system that includes delivering power to a high-Q resonator, measuring a voltage across a capacitor in said high-Q resonator and determining information regarding power delivered to said high-Q resonator.

1 . A method of determining information regarding power delivered to a high-Q resonator for a planar wireless power transfer system, comprising:
 delivering power to a high-Q resonator;   measuring a voltage across a capacitor in said high-Q resonator; and   determining information regarding power delivered to said high-Q resonator.   
     
     
         2 . A method of determining information regarding power delivered to a high-Q resonator for a planar wireless power transfer system, comprising:
 delivering power to a high-Q resonator;   measuring a current passing through a coil in said high-Q resonator; and   determining information regarding power delivered to said high-Q resonator.   
     
     
         3 . The method according to  claim 1 , wherein determining information regarding power delivered to the high-Q resonator comprises using said value to control system operation. 
     
     
         4 . The method according to  claim 2 , wherein determining information regarding power delivered to the high-Q resonator comprises using said value to control system operation. 
     
     
         5 . The method according to  claim 1 , further comprising: measuring a power delivered by a power source. 
     
     
         6 . The method according to  claim 2 , further comprising: measuring a power delivered by a power source. 
     
     
         7 . The method according to  claim 1 , wherein the information regarding power delivered by a power source indicates a change in delivered power. 
     
     
         8 . The method according to  claim 5 , wherein information regarding power delivered to the high-Q resonator comprises measuring a current in a coil and a voltage across a capacitor of said resonator. 
     
     
         9 . The method according to  claim 6 , wherein information regarding power delivered to the high-Q resonator comprises measuring a current in a coil and a voltage across a capacitor of said resonator. 
     
     
         10 . The method according to  claim 5 , further comprising: measuring coil current passing through said resonator coil. 
     
     
         11 . The method according to  claim 5 , wherein the information regarding power delivered by a power source indicates a change in delivered power. 
     
     
         12 . The method according to  claim 6 , wherein the information regarding power delivered by a power source indicates a change in delivered power. 
     
     
         13 . A wireless power apparatus, comprising:
 a high-Q resonator comprising a conducting loop and at least one capacitor;   configured for information exchange within the wireless power system.   
     
     
         14 . An apparatus as in  claim 13  further comprising a monitor for sensing operating parameters. 
     
     
         15 . An apparatus as in  claim 14  wherein said monitor information is exchanged within the wireless power system. 
     
     
         16 . An apparatus as in  claim 14  wherein said monitor information is used in a feedback loop.