Single-switch soft-switched power flow controller for wireless power transfer applications

This paper presents a novel power flow controller for wireless power transfer systems. The proposed method regulates the output voltage to a constant level by discharging the output filter capacitor when the voltage across the load is higher than a desired level. Unlike the traditional DC/DC topologies, the proposed controller doesn't require a bulky DC inductor which results in a compact system. This is one clear advantage of the proposed controller for some applications with space restrains such as smartphones. Moreover, it employs a single switch for both voltage rectification and regulation greatly reduces the components count and cost. The proposed method is a soft-switched topology which increases the system efficiency significantly. Simulation results have shown that the proposed method can achieve stable constant output voltage at different loading/coupling conditions.