A Review of Non-Isolated High Step-Up DC/DC Converters in Renewable Energy Applications

Li, Wuhua; Liu, Xiaodong; Deng, Yan; Li, Jun; He, Xiangning

doi:10.1109/apec.2009.4802683

Cited by 124 publications

(54 citation statements)

References 26 publications

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“…Of the entire high-boost ratio non-isolated DC-DC converter topologies published [19], a combination of fly-back and boost converter is highly efficient as it increases the boost ratio with lower cost and greater efficiency [18]. Besides, in the proposed topology, the need of an additional switch selection circuit as used in [17] is overcome by operating the converter with two different duty ratios one during non-commutation period, and the other during commutation period.…”

Section: Introductionmentioning

confidence: 95%

“…In the proposed high-boost ratio DC-DC converter [18] shown in Figure.1, HT is a hybrid transformer with turns ratio 1: n, M 1 is the MOSFET switch carrying current I s1 and C in is the input capacitor. A coupled inductor has been employed in the primary side of the transformer to provide a high step-up ratio and to reduce the switch voltage stress substantially.…”

Section: Proposed High Boost Ratio Dc-dc Converter and Its Operationmentioning

confidence: 99%

“…Use of low voltage input source is preferred over a high voltage source, and hence in the present paper a high boost ratio dc -dc converter (HBDC) [18] that requires very low dc voltage at the input side is used. Of the entire high-boost ratio non-isolated DC-DC converter topologies published [19], a combination of fly-back and boost converter is highly efficient as it increases the boost ratio with lower cost and greater efficiency [18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor

Raja

Geethalakshmi

2016

IJPEDS

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Brushless dc motor still suffers from commutation torque ripple, which primarily depends on transient line current in the commutation interval. In order to control the incoming and outgoing phase currents to change at the same rate during commutation, this paper presents a novel high boost ratio DC-DC circuit topology in the front end of the inverter. With a suitable closed loop control scheme, the proposed high boost ratio DC-DC converter is operated with two different duty ratios one during commutation period and the other during non commutation period. The cause of commutation ripple is analyzed, and the way to adjust the duty ratio for obtaining the desired dc link voltage is introduced in detail. Finally, simulation and experimental results show that, compared with the existing dc-dc converter topologies, the proposed method can obtain the desired voltage much faster and minimize commutation torque ripple more efficiently. Keyword:Brushless INTRODUCTIONBrushless dc motors (BLDCM) possessing simple structure, high power density, high torque/current ratio, robustness, and better dynamics have been widely used in all kinds of areas, such as electric vehicles, robotics, small actuators, industry and automotive electronics [1]- [3]. The performance of such motors has been significantly improved due to the great development of power converters, magnetic performance of magnets, and motion control technology in recent years [4]- [6]. However, commutation torque ripple has always been one major factor in preventing BLDCM from achieving high performance. The causes for torque ripple in BLDCM are the imperfection of motor design and manufacture, non-ideal EMF and unequal current sharing between the phases during commutation [7] and [8]. Since torque smoothness is an essential requirement for such high-performance applications, a wide variety of techniques have been proposed by many researchers during the past two decades to minimise the torque ripple [9]-[14].In recent years, multilevel inverters have gained much attention in the application areas of BLDC motor drives [21]. The problem of imperfection in the motor design is overcome in [13] [3], the inverter is operated in 120 mode for lower speed range of the machine and in 180 mode for higher speed range thereby optimizing the commutation

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Section: Introductionmentioning

confidence: 95%

Section: Proposed High Boost Ratio Dc-dc Converter and Its Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor

Raja

Geethalakshmi

2016

IJPEDS

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“…Transformerless solutions. In order to satisfy the stringent requirements with performance in renewable energy gridconnected power applications, many researchers concentrate on how to realize high voltage gain step-up, low cost and high efficiency single-stage converters [12]. The brief comparison of available single-stage transformerless converters will be presented below.…”

Section: Comparison Of Dc-dc Boost Convertersmentioning

confidence: 99%

“…Usually the efficiencies of high voltage gain step-up converters are at the levels over 90% at sub kilowatt or single kilowatt powers. To increase the overall efficiency of converter soft switching technique [8] as well as active clamped circuit [12] introduction may be considered.…”

Section: Comparison Of Dc-dc Boost Convertersmentioning

confidence: 99%

High efficiency high step-up DC/DC converters - a review

Tomaszuk¹,

Krupa²

2011

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. The renewable energy sources such as PV modules, fuel cells or energy storage devices such as super capacitors or batteries deliver output voltage at the range of around 12 to 70 VDC. In order to connect them to the grid the voltage level should be adjusted according to the electrical network standards in the countries. First of all the voltage should be stepped up to sufficient level at which the DC/AC conversion can be performed to AC mains voltage requirements. Overall performance of the renewable energy system is then affected by the efficiency of step-up DC/DC converters, which are the key parts in the system power chain. This review is focused on high efficiency step-up DC/DC converters with high voltage gain. The differentiation is based on the presence or lack of galvanic isolation. A comparison and discussion of different DC/DC step-up topologies will be performed across number of parameters and presented in this paper.

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