A Single-Ended WPT Circuit with Automatic CC-CV Transition

A Single-ended wireless power transfer (WPT) circuit with the automatic transition of constant current (CC) to constant voltage (CV) output is proposed in this paper. The proposed circuit has a simple structure and no shoot-through problem compared with full-bridge or half-bridge WPT circuits. To achieve the automatic transition of CC-CV output without active control, the double-D quadrature (DDQ) coils are used to simplify the analysis. The corresponding compensation networks are proposed to achieve the automatic transition from the CC mode to CV mode. Extra mode switches and frequency switching control are not used in the proposed method. Moreover, the transfer gain does not rely on the parameters of the loosely coupled transformer (LCT), and more parameters design freedom can be achieved in the proposed circuit.