Family of universal bidirectional DC–DC converters with an extended voltage gain

Abstract

This study presents a family of non-isolated bidirectional DC-DC converters with extended DC gain. Increasing of the DC gain range is achieved due to splitting the base inductor and also by using magnetically coupled inductors. All the variants of the proposed schemes are based on the use of the dual-half-bridge DC-DC converter. As a result, a number of improved schemes of buck, boost and buck-boost bidirectional converters were obtained with the possibility of increasing the voltageboosting ratio in boost converter mode and simultaneously reducing the voltage gain in the buck converter mode. The converters have a symmetrical structure, and this ensures the operation of each of them in four modes, which gives greater flexibility in matching the voltages of the power supply with storage devices. The formulas for the DC gain, maximum voltage stresses on the switches and a comparative evaluation of these parameters are presented. The modes of operation and equivalent schemes are considered in detail. For each of the schemes, the corresponding tables for the operation of the transistors are given. The analyses of the dynamic modes of the proposed converters is shown. The experimental verification completely confirms the theoretical results.

Bidirectional wide range and high voltage gain buck‐boost DC‐DC converter for EV chargers empowering V2G‐G2V applications

“…The total semiconductor device count of buck‐boost bidirectional dc‐dc converters i.e. the converters in [11, 18, 23, 19, 21, and 20] is 4, 3, 4, 8, 4, and 6, respectively and for the proposed converter it is 4. Although the total semiconductor device count of converter in [18] is lower than the proposed converter, the voltage gain ratio of [18] is lower than the proposed converter in both directions.…”

“…In this regard and to improve the voltage gain ratio of the conventional bidirectional buck-boost dc-dc converter in both directions, converters in [18,19] presented higher and wider voltage gain ratios for both forward and backward directions than the conventional buck-boost converter. However, the lack of direct connection between input and output terminals gives rise to EMI noise issues and still further improvements in the voltage gain ratio would be beneficial.…”

A Common-Ground Bidirectional Hybrid Switched-Capacitor DC–DC Converter with a High Voltage Conversion Ratio

“…This article is focused on a common-ground bidirectional switched-capacitor DC-DC converter (BHSC) with a high voltage conversion ratio that can be used in energy conversion and storage applications. The BHSC converter was compared with other bidirectional converters with high voltage conversion ratios [5,13,18,[25][26][27][28][29], and also with the classical bidirectional buck-boost converter, which was used as a comparison basis. The results are presented in Section 4.…”

“…A high voltage conversion ratio topology based on a modified version of the SEPIC converter presented in [26] was experimentally tested in laboratory for fixed voltage ratios, with good results. It is possible to obtain a high voltage conversion ratio by using split inductors or magnetically coupled inductors in the dual-half-bridge DC-DC converter [27]. Some converters derived through this method have the same voltage ratio as the hybrid topologies.…”