Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title 3-Level Boost Converter Having Lower Inductor for Interleaving Operation
Authors Kang-Mun Lee ; Seung-Woo Baek ; Hag-Wone Kim ; Kwan-Yuhl Cho ; Jeong-Won Kang
DOI 10.6113/TKPE.2021.26.2.96
Page pp.96-105
ISSN 1229-2214
Keywords TLBC (3-Level Boost Converter); Interleaved; Capacitor current ripple; Balancing control
Abstract Large-scale power converters consist of series or parallel module combinations. In these modular converter systems, the interleaving technique can be applied to improve capacitor reliability by reducing the ripple of the I/O current in which each module operates as a phase difference. However, when applying the interleaving technique for conventional three-level boost converters, the short-circuit period of the converter can be an obstacle. Such problem is caused by the absence of a low-level inductor of the conventional three-level boost converter. To solve this problem, a three-level boost converter with a low-level inductor is proposed and analyzed to enable interleaved operation. In the proposed circuit, the current ripple of the output capacitor depends on the neutral point connections between the modules. In this study, the ripple current is analyzed by the neutral point connections of the three-level boost converter that has a low-level inductor, and the effectiveness of the proposed circuit is proven by simulation and experiment.