A Bidirectional Isolated Integrated AC–DC Converter Based on an Interleaved 3-Level T-Type Power Converters

Welton Da S Lima,Dalton De A Honorio,Gustavo A De L Henn,Paulo P Praca,Luan Carlos Dos S Mazza,Demercil De S Oliveira,Luiz Henrique S C Barreto

doi:10.1109/access.2021.3120345

Abstract

This paper presents an integrated single-phase bidirectional ac–dc converter based on a dual-active-bridge (DAB) topology. The primary side is based on a multi-state switching cell (MSSC) with a T-type (TNPC) cell, which is composed of two three-level interleaved legs and coupled inductor, while the secondary side is a single-phase full-bridge (FB). Moreover, a comparative analysis between an isolated ac–dc converter with a neutral point clamped (NPC) converter on the primary side is presented. The basic converter operating principles and experimental results of a 850 W prototype are presented in order to validate the theoretical analysis. The control strategy is implemented on the TMS320F28379D DSP. The proposed topology achieves a maximum efficiency of 91.40% at 300 W output power, and 89.40% at rated power. From the experimental results, it can be stated that the converter based on the T-type topology is more efficient than the structure based on the NPC.

Highlights

In the last decades, the concern over the emission of greenhouse gases has prompted the automotive industry to look for alternatives to replace fossil fuel-powered engines for the ones powered by alternative energy sources [1], [2]
The switches on the primary and secondary sides are IGBT IRGP50B60PD from SEMIKRON SKHI61R driver, while diodes SCS230AE2 are used on the primary side of the neutral point clamped (NPC)
This paper presented a bidirectional isolated ac–dc converter based on the multi-state switching cell (MSSC) with a T-type (TNPC) cell on primary side

Summary

Introduction

The concern over the emission of greenhouse gases has prompted the automotive industry to look for alternatives to replace fossil fuel-powered engines for the ones powered by alternative energy sources [1], [2]. Thereby, as found in the literature, bidirectional, single-phase, and isolated topologies for battery chargers applied in electric vehicles have gained prominence. A categorization of such converters should be adopted in order to organize their characteristics. For this study, it is adopted the categorization by the number of energy conversion stages, resulting in two families: dual-stage and single-stage [3]. This kind of converters are attractive due to their bidirectional power flow and power factor

Methods

Results

Conclusion