A cooperative control of wireless power transfer system using two transmitters

A wireless power transfer system with a single transmitter fed by a voltage source and a single receiver with a load is widely studied to increase load power. A system with two transmitters is also studied, especially by controlling currents through transmitter coils to maximize load power, which means current sources to drive transmitter coils are assumed instead of the voltage source. This paper presents a method for adjusting voltage amplitude and phase of each voltage source embedded in two transmitters to maximize load power. The maximized load power is also presented in an explicit form based on circuit constants of the system. As a result, advantages of the two transmitters system over the single transmitter system are revealed from the perspective of efficient power delivery.