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Proceedings ArticleDOI

Non-isolated high gain boost converter for photovoltaic applications

13 Jun 2013-pp 277-280
TL;DR: In this article, a multilevel boost converter topology is proposed, which combines the simple boost converter and switched capacitor function to provide high voltage gain for renewable energy sources like photovoltaic cell or array.
Abstract: The output voltage from renewable energy sources like photovoltaic cell or array will be at low level Thismust be stepped up by an order of around 20 for practical applications or grid connection Series connection of arrays is not a viable solution Hence, high gain DC-DC converters are essential The proposed DC-DC converter topology is a multilevel boost converterwhich combines the simple boost converter and switched capacitor function to provide high voltage gain The proposed topology uses only one switch, one inductor, (2N-1) diodes and (2N-1) capacitors for obtaining an output which is N times the conventional boost converter In this topology, each device blocks only one voltage level Hence, low voltage devices may be used The main advantages of this topology are continuous input current, large conversion ratio without extreme duty cycle or transformer, which allows for high switching frequency This circuit can be built in a modular way The proposed converter is simulated and the output waveforms are plotted The experimental setup will be taken up as future work Further, it is proposed to be used in conjunction with multilevel inverters to facilitate grid connection
Citations
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Journal ArticleDOI
TL;DR: The topological derivation of H-SLCs is deduced by combining the passive and active switched-inductor unit and the operation modes of the proposed asymmetrical and symmetrical converters are illustrated.
Abstract: In applications where the high voltage gain is required, such as photovoltaic grid-connected system, fuel-cell and high-intensity discharge lamps for automobile, high step-up dc-dc converters have been introduced to boost the low voltage to a high bus voltage. The voltage gain of traditional boost converter is limited, considering the issues such as the system efficiency and current ripple. This paper proposes a class of hybrid switched-inductor converters (H-SLCs) for high step-up voltage gain conversion. First, the topological derivation of H-SLCs is deduced by combining the passive and active switched-inductor unit; second, this paper illustrates the operation modes of the proposed asymmetrical and symmetrical converters; third, the performance of the proposed converters is analyzed in detail and compared with existing converters; finally, a prototype is established in the laboratory, and the experimental results are given to verify the correctness of the analysis.

320 citations

Journal ArticleDOI
TL;DR: In this article, a fault-tolerant-cascaded quasi-Z-source dc-dc converter topology is proposed, where the defected modules are isolated from the converter by the virtue of some considered relays allowing the whole system keep working with the remained modules.
Abstract: This paper proposes a fault-tolerant-cascaded quasi- Z -source dc–dc converter structure and investigates its reliability through a precise mathematical evaluation. In order to enhance the reliability of the suggested topology, a robust control method is considered, as well. According to the utilized control method, at the moment of fault occurrence, the defected modules are isolated from the converter by the virtue of some considered relays allowing the whole system keep working with the remained modules. Since the defected modules are eliminated from the circuit, the duty cycles of the switches will be changed through the controlling system, so that the remained modules take the responsibility of maintaining the output voltage in the desired level. Operation principle of the converter along with the control method (consists of fault detection and elimination systems) is provided. Additionally, a reliability evaluation technique is considered and, reliability comparison between the proposed, conventional and flyback structures is illustrated. Taking advantage of a laboratory-built prototype, the practicality of the suggested structure is proven. The obtained results confirm higher reliability and mean time to failure of the proposed converter compared to the conventional and flyback structures. Therefore, it could be counted as a suitable structure in sensitive industrial applications.

42 citations


Cites methods from "Non-isolated high gain boost conver..."

  • ...Considering the advantages stated for nonisolated dc–dc converters, they are utilized in different types of systems including high-gain applications [33]....

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Proceedings ArticleDOI
18 Mar 2016
TL;DR: A multilevel boost converter (MLBC) topology is presented which consists of a simple boost converter and switched capacitor technique to provide high voltage gain to solve the problem of non-conventional energy sources at low voltage level.
Abstract: The non-conventional energy sources like photovoltaic cells and fuel cells will be at a low voltage level, this must be stepped up considerably for DC grid integration, for which we need a high voltage gain DC-DC boost converters. In this paper a multilevel boost converter (MLBC) topology is presented which consists of a simple boost converter and switched capacitor technique to provide high voltage gain. The main advantages of this topology are continuous input current, large voltage gain without maintaining high duty cycle, absence of transformer and use of devices with low voltage ratings. A DC input of 100 V is stepped up to 1000 V using MLBC topology. The performance of MLBC is compared with Transformerless High Boost DC-DC Converter for high voltage applications. It is shown that MLBC offers low voltage stress, low ripple current, better efficiency, etc. compared to Transformer-less High Boost DC-DC Converter. Simulation is performed in MATLAB/SIMULINK environment.

11 citations

Journal ArticleDOI
TL;DR: This work focuses on the design and analysis of an interleaved Boost converter DC-DC with coupled and independent inductors in terms of ripples and power, and a prototype of interleaving Boost converter with coupled inductors and a shifted control of the switches was realized.
Abstract: Our work focuses on the design and analysis of an interleaved Boost converter DC-DC with coupled and independent inductors in terms of ripples and power. An interleaving strategy is adopted to minimize the currents in the Boost components and consequently to miniaturize them. The command shift of the switch by the X.T value (X: shift coefficient 0

5 citations


Cites methods from "Non-isolated high gain boost conver..."

  • ...They consist of capacitors (Cs), inductors (L) and switches (Mosfet) in blocked saturated mode as shown in Figure 1 [1], [17], [18], [19]....

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Proceedings ArticleDOI
12 Jun 2019
TL;DR: A novel single-switch non-isolated dc-dc converter with a high step-up voltage gain, reduced voltage stress, and low input current ripple is developed, which makes the proposed converter suitable for renewable energy sources.
Abstract: To meet the increase in electrical energy demand and to reduce CO2 emissions from conventional power plants, Building Integrated Photo-Voltaic (BIPV) systems are gaining more attention. High gain DC-DC converters are essential to utilize the power generated from renewable energy sources and play a significant role in the overall renewable generation system performance. In this paper, a novel single-switch non-isolated dc-dc converter with a high step-up voltage gain, reduced voltage stress, and low input current ripple is developed. These features make the proposed converter suitable for renewable energy sources. The principle of operation, theoretical analysis, elements design, simulation by PSIM, and techno-economic study are presented.

5 citations


Cites methods from "Non-isolated high gain boost conver..."

  • ...Numerous high gain non-isolated converter topologies have been proposed using various voltage boosting techniques to increase the voltage gain and efficiency of the system such as multilevel [4], [5], interleaved[6], [7], cascaded [8] or using voltage multiplier cells [9], switched capacitor and coupled inductor....

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References
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Journal ArticleDOI
TL;DR: The superiority of the new, hybrid converters is mainly based on less energy in the magnetic field, leading to saving in the size and cost of the inductors, and less current stresses in the switching elements, lead to smaller conduction losses.
Abstract: A few simple switching structures, formed by either two capacitors and two-three diodes (C-switching), or two inductors and two-three diodes (L-switching) are proposed. These structures can be of two types: ldquostep-downrdquo and ldquostep-up.rdquo These blocks are inserted in classical converters: buck, boost, buck-boost, Cuk, Zeta, Sepic. The ldquostep-downrdquo C- or L-switching structures can be combined with the buck, buck-boost, Cuk, Zeta, Sepic converters in order to get a step-down function. When the active switch of the converter is on, the inductors in the L-switching blocks are charged in series or the capacitors in the C-switching blocks are discharged in parallel. When the active switch is off, the inductors in the L-switching blocks are discharged in parallel or the capacitors in the C-switching blocks are charged in series. The ldquostep-uprdquo C- or L-switching structures are combined with the boost, buck-boost, Cuk, Zeta, Sepic converters, to get a step-up function. The steady-state analysis of the new hybrid converters allows for determing their DC line-to-output voltage ratio. The gain formula shows that the hybrid converters are able to reduce/increase the line voltage more times than the original, classical converters. The proposed hybrid converters contain the same number of elements as the quadratic converters. Their performances (DC gain, voltage and current stresses on the active switch and diodes, currents through the inductors) are compared to those of the available quadratic converters. The superiority of the new, hybrid converters is mainly based on less energy in the magnetic field, leading to saving in the size and cost of the inductors, and less current stresses in the switching elements, leading to smaller conduction losses. Experimental results confirm the theoretical analysis.

1,186 citations

Journal ArticleDOI
TL;DR: A DC-DC converter topology is proposed, which combines the boost converter and the switched capacitor function to provide different output voltages and a self-balanced voltage using only one driven switch, one inductor, 2 diodes and 2 capacitors for an Nx MBC.
Abstract: A DC-DC converter topology is proposed. The DC-DC multilevel boost converter (MBC) is a pulse-width modulation (PWM)-based DC-DC converter, which combines the boost converter and the switched capacitor function to provide different output voltages and a self-balanced voltage using only one driven switch, one inductor, 2 N -1 diodes and 2 N -1 capacitors for an Nx MBC. It is proposed to be used as DC link in applications where several controlled voltage levels are required with self-balancing and unidirectional current flow, such as photovoltaic (PV) or fuel cell generation systems with multilevel inverters; each device blocks only one voltage level, achieving high-voltage converters with low-voltage devices. The major advantages of this topology are: a continuous input current, a large conversion ratio without extreme duty cycle and without transformer, which allow high switching frequency. It can be built in a modular way and more levels can be added without modifying the main circuit. The proposed converter is simulated and prototyped; experimental results prove the proposition's principle.

437 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a new high step-up dc-dc converter designed especially for regulating the dc interface between various microsources and a dc-ac inverter to electricity grid.
Abstract: This paper proposes a new high step-up dc-dc converter designed especially for regulating the dc interface between various microsources and a dc-ac inverter to electricity grid. The figuration of the proposed converter is a quadratic boost converter with the coupled inductor in the second boost converter. The converter achieves high step-up voltage gain with appropriate duty ratio and low voltage stress on the power switch. Additionally, the energy stored in the leakage inductor of the coupled inductor can be recycled to the output capacitor. The operating principles and steady-state analyses of continuous-conduction mode and boundary-conduction mode are discussed in detail. To verify the performance of the proposed converter, a 280-W prototype sample is implemented with an input voltage range of 20-40 V and an output voltage of up to 400 V. The upmost efficiency of 93.3% is reached with high-line input; on the other hand, the full-load efficiency remains at 89.3% during low-line input.

377 citations

Journal ArticleDOI
TL;DR: A novel high step-up dc-dc converter with coupled-inductor and switched-capacitor techniques is proposed, which can achieve highstep-up voltage gain with appropriate duty ratio and reduce the conduction loss.
Abstract: A novel high step-up dc-dc converter with coupled-inductor and switched-capacitor techniques is proposed in this paper. The capacitors are charged in parallel and are discharged in series by the coupled inductor, stacking on the output capacitor. Thus, the proposed converter can achieve high step-up voltage gain with appropriate duty ratio. Besides, the voltage spike on the main switch can be clamped. Therefore, low on-state resistance RDS(ON) of the main switch can be adopted to reduce the conduction loss. The efficiency can be improved. The operating principle and steady-state analyses are discussed in detail. Finally, a prototype circuit with 24-V input voltage, 400-V output voltage, and 200-W output power is implemented in the laboratory. Experiment results confirm the analysis and advantages of the proposed converter.

291 citations

Journal ArticleDOI
TL;DR: In this article, a novel interleaved high step-up converter with voltage multiplier cell is proposed to avoid the extremely narrow turn-off period and to reduce the current ripple, which flows through the power devices compared with the conventional interleaving boost converter in high stepup applications.
Abstract: A novel interleaved high step-up converter with voltage multiplier cell is proposed in this paper to avoid the extremely narrow turn-off period and to reduce the current ripple, which flows through the power devices compared with the conventional interleaved boost converter in high step-up applications. Interleaved structure is employed in the input side to distribute the input current, and the voltage multiplier cell is adopted in the output side to achieve a high step-up gain. The voltage multiplier cell is composed of the secondary windings of the coupled inductors, a series capacitor, and two diodes. Furthermore, the switch voltage stress is reduced due to the transformer function of the coupled inductors, which makes low-voltage-rated MOSFETs available to reduce the conduction losses. Moreover, zero-current-switching turn- on soft-switching performance is realized to reduce the switching losses. In addition, the output diode turn-off current falling rate is controlled by the leakage inductance of the coupled inductors, which alleviates the diode reverse recovery problem. Additional active device is not required in the proposed converter, which makes the presented circuit easy to design and control. Finally, a 1-kW 40-V-input 380-V-output prototype operating at 100 kHz switching frequency is built and tested to verify the effectiveness of the presented converter.

245 citations


"Non-isolated high gain boost conver..." refers background or methods in this paper

  • ...Interleaved and cascaded boost converters were conventionally used to obtain the required high voltage gain [1]-[2]....

    [...]

  • ...[1] Wuhua Li, Yi Zhao, Yan Deng Converter with Voltage Multiplier efficiency Conversion”, IEEE Trans September 2010....

    [...]

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