Four-Switch Buck-Boost Integrated Bridge for Bidirectional IPT System

In this paper, a novel four-switch buck-boost (FSBB) integrated bridge is put forward for the bidirectional inductive power transfer (BIPT) system. By integrating a FSBB topology with the full-bridge (FB), the dc voltage utilization of the proposed FSBB integrated bridge as inverter is improved from $2\sqrt 2 /\pi $ to $\sqrt 2 $, and the resistance conversion ratio range of the FSBB integrated bridge as active rectifier is extended from [0,8/π<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>] to [0, 2]. Therefore, the BIPT system with FSBB integrated bridges can output more active power, maintain the rated power at larger coil misalignment, and guarantee impedance matching over a wider load range. A 100W experimental prototype is provided to verify the effectiveness of the proposed bridge.