Four-Switch Buck-Boost Integrated Bridge for Bidirectional Inductive Power Transfer With Hybrid Energy Storage System

Hybrid energy storage systems (HESSs) with battery and supercapacitor (SC) are commonly used to cope with repeated power pulses in the wireless traffic energy Internet. Traditionally, converters with multiple power conversion stages are required for wireless charging of the HESS, increasing both the cost and losses. To address this issue, this article proposes a four-switch buck–boost (FSBB) integrated bridge that multiplexes the half-bridges in the FSBB topology for bidirectional inductive power transfer (BIPT) systems. Without adding additional power conversion stage, the proposed FSBB integrated bridge provides two dc ports for HESS and an ac port for BIPT system. This article also presents the modulation method for the FSBB integrated bridge and control strategy with optimal efficiency tracking for the BIPT system with HESS. With the proposed modulation method and control strategy, energy can flow freely and effectively among the battery, SC, and primary source of the BIPT system. A 150 W experimental prototype is provided to verify the effectiveness of the proposed FSBB integrated bridge for BIPT system with HESS.