A Four-Phase High Voltage Conversion Ratio Bidirectional DC-DC Converter for Battery Applications

Abstract

This study presents a four-phase interleaved high voltage conversion ratio bidirectional DC-DC converter circuit based on coupled inductors and switched capacitors, which can eliminate the defects of conventional high voltage conversion ratio bidirectional DC-DC converters in terms of high-voltage/current stress, less efficiency and low-power limitation. Parallel channels are used to reduce current stress at the low-voltage side and series connected switched capacitors are used to enlarge voltage conversion ratio, reduce voltage stress and achieve auto current sharing. This paper proposes the operation principle, feature analysis and optimization design considerations. On this basis the objectives of high voltage conversion ratio, low voltage/current stress, high power density, high efficiency and high-power applications can be achieved. Some experimental results based on a 500 W prototype converter (24 V to 48 V at low-voltage side, 400 V at high-voltage side) are given to verify the theoretical analysis and the effectiveness of the proposed converter.

Comparative Analysis of High Power Density Bidirectional DC-DC Converters for Portable Energy Storage Applications

“…For further calculations, the value of the voltage on the charge-pump capacitor C 1 is needed. It can be expressed from the equation system for inductor volt-second balance [42], [46]…”

Design and Realization of a Bidirectional Full Bridge Converter with Improved Modulation Strategies

“…State of art and future trends concerning DC-DC converters for automotive applications are widely provided in Reference [13], whereas different investigations on DC-DC bidirectional converters for both supercapacitors and battery charging applications are provided in References [14][15][16][17], with particular focus on reliability, ease of control, sizing and robustness. Due to the potentially high voltage range of a stack of supercapacitors, proper DC-DC converter architectures could be used-in References [18][19][20][21] high-voltage-ratio topologies are described, feasible for several applications such as automotive, DC microgrids and renewable energy sources.…”

High boost‐ratio bidirectional converter for interfacing low‐voltage battery energy storage system to a DC bus

“…The terminal voltages of the RES feeding the DC microgrids are, however, much lower than these DC-bus voltages, necessitating the use of high boost-ratio DC-DC converters (HBRCs) to interface these sources to the DC bus [4-8, 10-12, 15]. The HBRCs employed in these applications can be categorised into those with galvanic isolation [8,[14][15][16][17] and those without [4][5][6][7][8][9][10][11][12][13][14][15][18][19][20][21][22][23][24][25][26]. Galvanic isolation can be provided using either transformers or coupled inductors [14][15][16][17].…”