Space-adaptive wireless power transfer system and method using multiple resonance coils

Abstract

A magnetic resonance wireless power transfer method according to an aspect of the present invention includes transmitting power from a source coil to the Tx resonant coil using a magnetic induction method, transmitting the power from the Tx resonant coil to an Rx resonant coil, having a resonant frequency identical with that of the Tx resonant coil, via magnetically-coupled resonance, and transmitting the power from the Rx resonant coil to the device coil of an electronic device using the magnetic induction method. The Tx resonant coil and the Rx resonant coil are arranged at a right angle or a specific angle of inclination relative to each other.

1 . A magnetic resonance wireless power transfer method, comprising:
 transferring power from a source coil to a transmitting (Tx) resonant coil using a magnetic induction method;   transferring the power from the Tx resonant coil to an intermediate resonant coil, having a resonant frequency identical with that of the Tx resonant coil, via magnetically-coupled resonance;   transferring the power from the intermediate resonant coil to an receiving (Rx) resonant coil, having a resonant frequency identical with the Rx resonant coil, via magnetically-coupled resonance; and   transferring the power from the Rx resonant coil to a device coil of an electronic device using a magnetic induction method;   wherein the intermediate resonant coil is placed between Tx resonant coil and Rx resonant coil in geometrical configuration.   
     
     
         2 . The magnetic resonance wireless power transfer method as set forth in  claim 1 ,
 wherein the intermediate resonant coil is placed at a right angle or an angle of inclination relative to the Tx resonant coil and the Rx resonant coil, or is placed on the different plane with the Tx resonant coil and the Rx resonant coil, and the center axes of the intermediate resonant coil, the Tx resonant coil, and Rx resonant coil are parallel to each other but not identical with each other.   
     
     
         3 . A magnetic resonance wireless power transfer system, comprising:
 a source coil configured to be supplied with power from a source;   a transmitting (Tx) resonant coil configured to be supplied with the power from the source coil using a magnetic induction method;   an intermediate resonant coil supplied with power from the Tx resonant coil at a resonant frequency identical with that of the Tx resonant coil using a magnetic resonance mechanism; and   an receiving (Rx) resonant coil configured to be supplied with the power from the intermediate resonant coil at a resonant frequency identical with that of the intermediate resonant coil via magnetically-coupled resonance,   wherein the intermediate resonant coil is placed between Tx resonant coil and Rx resonant coil in geometrical configuration.   
     
     
         4 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein the intermediate resonant coil is placed at a right angle or an angle of inclination relative to the Tx resonant coil and the Rx resonant coil, or is placed on the different plane with the Tx resonant coil and the Rx resonant coil, and the center axes of the intermediate resonant coil, the Tx resonant coil, and Rx resonant coil are parallel to each other but not identical with each other, and the Rx resonant coil transfers the power to a device coil of an electronic device using a magnetic induction method. 
     
     
         5 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein at least one of the Tx resonant coil, the Rx resonant coil, and the intermediate resonant coil comprises;
 a lumped inductor or a capacitor whose two electrodes are connected between both ends of the at least one coil, or whose only one electrode is connected to one of both ends of the at least one coil, to both ends of the at least one coil, or to an intermediate portion of the at least one coil.   
     
     
         6 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein the Tx resonant coil, the Rx resonant coil, or the intermediate resonant coil has a helical or spiral form. 
     
     
         7 . The magnetic resonance wireless power transfer system as set forth in  claim 6 , wherein the Tx resonant coil, the Rx resonant coil, or the intermediate resonant coil has a form in which a wire is wound around a magnetic body. 
     
     
         8 . The magnetic resonance wireless power transfer system as set forth in  claim 4 , wherein the Tx resonant coil directly transfers the power to the Rx resonant coil and simultaneously the intermediate resonant coil transfers the power to the Rx resonant coil. 
     
     
         9 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein the Rx resonant coil transfers the power to the device coil of the electronic device using the magnetic induction method, and simultaneously the intermediate resonant coil transfers the power to a device coil of another electronic device using the magnetic induction method. 
     
     
         10 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , further comprising an impedance matching circuit between the source and the source coil, or the device coil and a rectifier circuit or load of the electronic device. 
     
     
         11 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein impedance matching is performed by controlling a number of turns and size of the source coil or the Tx resonant coil and the Rx resonant coil even without using an impedance matching circuit. 
     
     
         12 . The magnetic resonance wireless power transfer system as set forth in  claim 5 , wherein a sum of a capacitance of the at least one coil itself to which the capacitor is additionally coupled and a capacitance of the added capacitor is equal to or higher than 50 pF and equal to or lower than 10 nF. 
     
     
         13 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein the Tx resonant coil is embedded in a wall or a board, the Rx resonant coil is embedded in a desk or a table, a space, another wall, a pad, or a container near the wall, and the electronic device near the Rx resonant coil is supplied with the power. 
     
     
         14 . The magnetic resonance wireless power transfer system as set forth in  claim 3 , wherein the Tx resonant coil, the intermediate resonant coil and the Rx resonant coil are arranged so that the center axes of the Tx resonant coil, the intermediate resonant coil and the Rx resonant coil are parallel to each other, but the center axes are not identical with each other.