Coil configuration in a wireless power transmitter

Abstract

Techniques for coil configuration in a wireless power transmitter in a system, method, and apparatus are described herein. An apparatus for coil configuration in a wireless power transmitter may include a transmitting coil comprising an inner portion and an outer portion, and a switch configured to initiate current on the inner portion based on a detected condition.

1 . An apparatus for coil configuration in a wireless power transmitter, comprising:
 a transmitter coil comprising an inner portion and an outer portion; and   a switch configured to initiate current on the inner portion based on a detected condition.   
     
     
         2 . The apparatus of  claim 1 , wherein the detected condition comprises a distance of separation between the transmitter coil and a receiver coil inductively coupled to the transmitter coil. 
     
     
         3 . The apparatus of  claim 2 , wherein initiating the current on the inner portion is configured to generate an increase in magnetic field uniformity of the transmitter coil based on the detected separation. 
     
     
         4 . The apparatus of  claim 1 , wherein the detected condition comprises a measure of coil overlap between the transmitter coil and a receiver coil inductively coupled to the transmitter coil. 
     
     
         5 . The apparatus of  claim 1 , wherein the switch is further configured to initiate wireless charging components configured to change characteristics of current driven on the inner portion in comparison the outer portion. 
     
     
         6 . The apparatus of  claim 1 , wherein the inner portion is configured to be electrically coupled to the outer portion in series. 
     
     
         7 . The apparatus of  claim 1 , wherein the inner portion is configured to be electrically coupled to the outer portion in parallel. 
     
     
         8 . The apparatus of  claim 1 , further comprising a sensor to detect the condition. 
     
     
         9 . The apparatus of  claim 8 , wherein the sensor comprises:
 an orientation sensor configured to determine an orientation associated with the detected condition;   a reactance shift detector configured to detect a reactance shift associated with an overlap of a receiver coil at the transmitter coil; and   any combination thereof.   
     
     
         10 . The apparatus of  claim 9 , wherein upon detection of the reactance shift the switch is configured to discontinue current on the inner portion of the transmission coil to reduce magnetic coupling of the transmission coil to a receiver coil. 
     
     
         11 . A method for coil configuration in a wireless power transmitter, comprising:
 detecting a condition related to a receiver coil inductively coupled to a transmitter coil comprising current initiated on an outer portion;   initiating current on an inner portion based on the detected condition.   
     
     
         12 . The method of  claim 11 , wherein the detected condition comprises a distance of separation between the transmitter coil and the receiver coil. 
     
     
         13 . The apparatus of  claim 12 , wherein initiating the current on the inner portion comprises generating an increase in magnetic field uniformity of the transmitter coil based on the detected separation. 
     
     
         14 . The method of  claim 11 , further comprising detecting a reactance shift due to a measure of coil overlap between the transmitter coil and the receiver coil. 
     
     
         15 . The method of  claim 14 , further comprising discontinuing current on the inner portion of the transmission coil upon detection of the reactance shift to reduce magnetic coupling of the transmitter coil to the receiver coil. 
     
     
         16 . The method of  claim 11 , further comprising initiating wireless charging components configured to change characteristics of current driven on the inner portion in comparison the outer portion. 
     
     
         17 . The method of  claim 11 , wherein the inner portion is configured to be electrically coupled to the outer portion in series. 
     
     
         18 . The method of  claim 11 , wherein the inner portion is configured to be electrically coupled to the outer portion in parallel. 
     
     
         19 . The method of  claim 11 , wherein detecting the condition comprises detecting an orientation of the wireless power transmitter potentially associated with the detected condition. 
     
     
         20 . The method of  claim 11 , wherein initiating current on the inner portion is performed dynamically during wireless power charging operations of the wireless power transmitter. 
     
     
         21 - 25 . (canceled)