Wireless load modulation

Abstract

Techniques of load modulation are described herein. A wireless power receiving unit may include a receiving coil to receive a short beacon having a first time period, and a long beacon having a second time period longer than the first time period. A controller of the wireless power receiving unit is to initiate load modulation at the receiving coil during the long beacon. The controller is configured to continue to perform the load modulation during the long beacon until sufficient power is received at the wireless power receiving unit to initiate a wireless data transmission during the long beacon.

What is claimed is: 
     
         1 . A wireless power receiving unit, comprising:
 a receiving coil to receive a short beacon having a first time period, and a long beacon having a second time period longer than the first time period;   a controller to initiate load modulation during the long beacon at the receiving coil; and   wherein the controller is to continue to perform the load modulation during the long beacon until sufficient power is received at the wireless power receiving unit to initiate a wireless data transmission during the long beacon.   
     
     
         2 . The wireless power receiving unit of  claim 1 , wherein the time period of the long beacon has a minimum time and a maximum time, and wherein the long beacon persists to the maximum time as long as the load modulation persists. 
     
     
         3 . The wireless power receiving unit of  claim 1 , wherein the wireless data transmission comprises a sequence of load modulations indicating a binary sequence. 
     
     
         4 . The wireless power receiving unit of  claim 3 , wherein the load modulation is performed in the binary sequence to indicate:
 a power charging profile of a device housing the receiving coil via the binary sequence; or   a device identification of a device housing the receiving coil via the binary sequence, or   any combination thereof.   
     
     
         5 . The wireless power receiving unit of  claim 1 , further comprising a Bluetooth Low Energy (BLE) module, wherein the wireless data transmission comprises a BLE advertisement from the BLE module. 
     
     
         6 . The wireless power receiving unit of  claim 1 , further comprising load modulation circuitry wherein the controller is to direct the load modulation circuitry to increase or decrease a load received at the wireless power receiving unit. 
     
     
         7 . The wireless power receiving unit of  claim 1 , further comprising a direct current to direct current (DC2DC) converter, wherein the controller is configured to direct the DC2DC converter to modulate the load based on modulating rates of direct current conversion. 
     
     
         8 . The wireless power receiving unit of  claim 1 , wherein the short beacon and long beacon are generated at a wireless power transmitting unit having a transmitting coil, and wherein receiving the short beacon at the wireless power receiving unit generates an initial load change at the wireless power transmitting unit indicating the presence of the wireless power receiving unit. 
     
     
         9 . The wireless power receiving unit of  claim 8 , wherein the wireless data transmission indicates the wireless power receiving unit is a valid power receiving unit according to a wireless transmission protocol associated with the wireless power transmitting unit. 
     
     
         10 . The wireless power receiving unit of  claim 1 , wherein the load modulation comprises:
 an increase in load; or   a decrease in load; or   any combination thereof.   
     
     
         11 . A method of load modulation in a wireless component, comprising:
 receiving a short beacon having a first time period at a receiving coil from a transmitting coil;   performing an initial load change at the receiving coil to indicate the presence of the receiving coil to the transmitting coil;   receiving a long beacon having a second time period longer than the first time period in response to the load modulation at the receiving coil; and   performing a load modulation during the long beacon until sufficient power is received at the wireless power receiving unit to initiate a wireless data transmission during the long beacon.   
     
     
         12 . The method of  claim 11 , wherein the time period of the long beacon has a minimum time and a maximum time, the method further comprising persisting to transmit the long beacon to the maximum time as long as the load modulation persists. 
     
     
         13 . The method of  claim 11 , wherein the wireless data transmission comprises a sequence of load modulations indicating a binary sequence. 
     
     
         14 . The method of  claim 13 , the further comprising:
 transmitting a binary sequence of load modulation indicating a power charging profile of a device housing the receiving coil via the binary sequence; or   transmitting a binary sequence of load modulation indicating a device identification of a device housing the receiving coil via the binary sequence, or   any combination thereof.   
     
     
         15 . The method of  claim 11 , wherein the wireless data transmission comprises a Bluetooth Low Energy (BLE) advertisement, wherein the method comprises transmitting the BLE advertisement from a BLE module. 
     
     
         16 . The method of  claim 11 , the method further comprising increasing or decreasing a load received at the wireless power receiving unit by load modulation circuitry. 
     
     
         17 . The method of  claim 11 , the method further comprising modulating rates of direct current conversion at direct current to direct current (DC2DC) converter. 
     
     
         18 . The method of  claim 11 , wherein the short beacon and long beacon are generated at a wireless power transmitting unit having a transmitting coil. 
     
     
         19 . The method of  claim 18 , wherein the wireless data transmission indicates the wireless power receiving unit is a valid power receiving unit according to a wireless transmission protocol associated with the wireless power transmitting unit. 
     
     
         20 . The method of  claim 11 , wherein the load modulation comprises:
 an increase in load; or   a decrease in load; or   any combination thereof.   
     
     
         21 . A wireless power transmitting unit, comprising:
 a transmitting coil to transmit a short beacon having a first time period and a long beacon having a second time period relatively longer than the first time period;   a controller having logic, at least partially comprising hardware logic, to:
 detect an initial load change at upon generating a short beacon indicating a presence of a receiving coil; 
 issue a long beacon to the receiving coil in response to the initial load change; and 
 issue the long beacon as long as a load modulation is detected. 
   
     
     
         22 . The wireless power transmitting unit of  claim 21 , wherein the time period of the long beacon has a minimum time and a maximum time, and wherein the long beacon persists to the maximum time as long as the load modulation persists. 
     
     
         23 . The wireless power transmitting unit of  claim 21 , wherein the long beacon persists until a wireless data transmission is received from a wireless power receiving unit. 
     
     
         24 . The wireless power transmitting unit of  claim 21 , wherein the wireless data transmission comprises:
 a Bluetooth Low Energy (BLE) transmission; or   a binary sequence of the load modulation; or   any combination thereof.   
     
     
         25 . The wireless power transmitting unit of  claim 21 , wherein the wireless data transmission indicates a wireless power receiving unit receiving the long beacon is a valid wireless power receiving unit according to a wireless transmission protocol associated with the wireless power transmitting unit.