Multiphase Interleaved IPT Based Current-Source Converter for High-Current Application

This article proposes a multiphase interleaved inductive power transfer (IPT) based dc–dc converter for high-current applications. There are three main contributions. First, the proposed converter is designed based on a loosely coupled IPT system with series compensation capacitors, which permits large leakage inductance and avoids magnetic saturation. Second, series capacitors are used to compensate the magnetic coupler, which achieves load-independent output current, namely a current-source converter. Third, a scalable multiphase converter is achieved with an input-parallel output-parallel structure for high current. Meantime, an interleaved control strategy is implemented to an N-phase system with an angle shift of 360°/(2×N), reducing output current ripples. A 2-kW/100-A three-phase converter prototype is implemented with zero-voltage switching and harmonic loss suppression. Experimental results show a load-independent output current, which is linearly regulated by input dc voltage. With an input voltage of 480 V, the output current reaches 101.5 A with a small peak-peak ripple of 2.4 A. Output power reaches 2.07 kW with a 91.39% dc–dc efficiency. A steady-state test for a solid-state circuit breaker (SSCB) is conducted using the proposed high-current converter, showing its application in evaluating the steady-state efficiency and thermal performance of SSCB.