Carregador de bateria sem contato elétrico com integração de estágios de processamento de energia

Abstract

This work presents an integrated electromagnetic inductive power transfer system designed for contactless battery charging. The proposed solution combines, in a unified structure, an interleaved boost rectifier responsible for grid connection, a series-series (SS) resonant stage in a half-bridge configuration, and the control and modulation strategies required to ensure softswitching operation over a wide power range. This integration reduces the number of processing stages, provides a high input power factor, and achieves overall efficiency above 91 % with low structural complexity. On the receiver side, a simple synchronous rectifier is introduced, operating without current sensors and based solely on locally measured quantities, which reduces conduction losses and enhances operational robustness. Power control is fully implemented on the transmitter side, without the need for current sensing or high-speed communication with the receiver, relying only on accessible voltage measurements and known system parameters. To validate the theoretical analysis, the control model, and the soft-switching and modulation strategies, an 850 W prototype was developed and tested. The experimental results confirm the feasibility of the proposed integrated solution and demonstrate high efficiency, low harmonic content in the input current, and stable operation across the entire evaluated power range.