Improved bidirectional DC/DC converter configuration with ZVS for energy storage system: analysis and implementation

Abstract

This study proposes a novel design of soft-switching based bidirectional converter for the applications in energy storage systems. By implementing an additional auxiliary circuit to the conventional non-isolated converter, the proposed converter inherits better efficiency with minimised turn-on losses. Moreover, auxiliary switching devices are also soft-switched. This converter can be operated at high power outputs through ZVS turn-on operation. The operation principle, design analysis and experimental results are reported to validate its main features in the study. Furthermore, the performance of this converter is analysed on a 1 kW laboratory prototype for both boost and buck modes.

Fully soft switched high step‐up/down bidirectional buck/boost converter with reduced switch voltage stress

“…To buffer energy in these systems, storage devices along with a bidirectional DC‐DC converter (BDC) are required due to the difference of the consumed and the generated power in renewable sources. In fact, BDCs are employed to manage voltage level and transfer power between the storage devices as a low voltage source ($$V_L$$) and DC bus as a high voltage source ($$V_H$$) [3–5]. When the voltage difference between $$V_H$$ and $$V_L$$ is high, a BDC with high voltage conversion ratio (VCR) is inevitable [6, 7].…”

An improved wide ZVS soft‐switching range PWM bidirectional forward converter for low power applications with simple control circuit

“…The applications such as photovoltaic energy systems and uninterrupted power supplies (UPS) require the dc-dc bidirectional converter (BDC) with the wide power range to interface energy storage systems such as battery to the high voltage dc bus [1][2][3][4][5]. Increasing the power density, decreasing the weight and cost of bidirectional converters which are provided by increasing the switching frequency [6][7][8].…”