High voltage conversion ratio, switched C &amp;amp; L cells, step-down DC-DC converter

This paper proposes a bi-directional DC-DC converter used as interface between the battery stack and the DC bus in a microgrid application, highlighting its main feature that permits a large conversion rate, with a low number of semiconductors and without using transformers. Analytical descriptions, design aspects, digital simulation and preliminary experimental results are presented, in order to check its operation in both power flow modes, emphasizing the transition between step-up and step-down regimes. It is proved that a simple hysteresis controller is able to assure the stability and a smooth transition between battery charging and discharging modes. The transistors driving signals are complementary which gives the advantage of using a single PWM control.

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“…The limit currents are calculated considering the voltage V 1 constant, using again eqs. (8) and (9) and obtaining the same result (10). …”

Section: Design Considerationssupporting

confidence: 57%

“…They have some advantages over the classical ones, the main disadvantage being the increased number of the passive and active components [8,9].…”

Section: Introductionmentioning

confidence: 99%

Bi-directional hybrid DC-DC converter with large conversion ratio for microgrid DC busses interface

Cornea

Guran

Muntean

et al. 2014

2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion

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“…The intermediate capacitor snubber is employed to reduce switching losses of the converter and to improve the efficiency. In [172]- [175], the interleaved buck converter proposed with the coupled inductor. The power circuit of the converter discussed in [173] shown in Fig.…”

Section: Transformer and Coupled Inductor Based Dc-dc Converter mentioning

confidence: 99%

Survey of DC-DC Non-Isolated Topologies for Unidirectional Power Flow in Fuel Cell Vehicles

et al. 2020

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The automobile companies are focusing on recent technologies such as growing Hydrogen (H2) and Fuel Cell (FC) Vehicular Power Train (VPT) to improve the Tank-To-Wheel (TTW) efficiency. Benefits, the lower cost, 'Eco' friendly, zero-emission and high-power capacity, etc. In the power train of fuel cell vehicles, the DC-DC power converters play a vital role to boost the fuel cell stack voltage. Hence, satisfy the demand of the motor and transmission in the vehicles. Several DC-DC converter topologies have proposed for various vehicular applications like fuel cell, battery, and renewable energy fed hybrid vehicles etc. Most cases, the DC-DC power converters are viable and cost-effective solutions for FC-VPT with reduced size and increased efficiency. This article describes the state-of-the-art in unidirectional nonisolated DC-DC Multistage Power Converter (MPC) topologies for FC-VPT application. The paper presented the comprehensive review, comparison of different topologies and stated the suitability for different vehicular applications. This article also discusses the DC-DC MPC applications more specific to the power train of a small vehicle to large vehicles (bus, trucks etc.). Further, the advantages and disadvantages pointed out with the prominent features for converters. Finally, the classification of the DC-DC converters, its challenges, and applications for FC technology is presented in the review article as stateof-the-art in research.

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“…Buck converts employing coupled inductors are proposed for obtaining small current ripples with smaller inductors [38][39][40][41][42][43]. Fig .16 shows a buck converts with two coupled inductors.…”

Section: Coupled Inductor Buck Convertersmentioning

confidence: 99%