Comparative evaluation of buck and hybrid buck DC-DC converters for automotive applications

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: 56%

“…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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“…A unified method can be used for developing hybrid converter topologies (HBDC), with advantages regarding the magnetic components, compared with the quadratic converters [13]. Some comparison aspects between HBDC and BDC are treated also in [14,15]. This paper extends the hybrid topologies presented in the literature and proposes a switched C & L cell hybrid DC-DC step-down converter (HBDC-CL) made by inserting an input switching capacitor cell and an output switching inductor cell in a BDC, in order to obtain a higher voltage conversion ratio compared with BDC or HBDC.…”

Section: Introductionmentioning

confidence: 99%

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

Pelan

Muntean

Cornea

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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The paper presents a high voltage conversion ratio DC-DC step-down topology obtained from a classical buck converter associated with an input switched-capacitor cell and an output switched-inductor cell. Analytical descriptions, the voltage and current limits of the main components are synthesized in a comparative form, related to the classical buck structure, in order to emphasis the advantages of the proposed converter. Digital simulations and experimental results obtained with a built prototype are compared. From the first evaluation, the proposed converter is expected to be effectively used at input to output voltage ratios higher than 20.

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“…However, the input current is pulsating and voltage regulation is poor. Hybrid switched capacitor step-down convertor have been developed to solve the problem of conventional switched capacitor step down converts [27][28][29][30][31][32]. A hybrid switch capacitor converter made of first stage switched capacitor convertor followed by a second stage traditional buck convertor is shown in Figure 12.…”

Section: Switched-capacitor Step Down Convertersmentioning

confidence: 99%

A Review of Non-Isolated High Step-Down Dc-Dc Converters

Farooq¹,

Malik²,

Sun³

et al. 2015

IJSH

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Comparative evaluation of buck and hybrid buck DC-DC converters for automotive applications

Cited by 13 publications

References 6 publications

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

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

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

A Review of Non-Isolated High Step-Down Dc-Dc Converters

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Comparative evaluation of buck and hybrid buck DC-DC converters for automotive applications

Cited by 13 publications

References 6 publications

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

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

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

A Review of Non-Isolated High Step-Down Dc-Dc Converters

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