Maximum power and efficiency transmission using parallel energy storage load for wireless power transfer systems

For the battery/super-capacitor hybrid system as the wireless power transfer system load, it is rarely discussed. In this paper, the characteristics of such a system are considered, a charging topology is proposed. And a control strategy is proposed to not only meet the requirements of the system energy output, but also maintain the high efficiency of the system based on rational design of power allocation strategy. Firstly, the characteristics of WPT system with LCC topology are analyzed. The system has the constant secondary side voltage output, if the output power is adjusted properly that means the equivalent load can be controlled to the optimal value. And the hybrid system power can be controlled to optimal power to track the optimal efficiency under the constant voltage. Finally, the feasibility of the control method is verified by experiments.