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Proceedings ArticleDOI

A novel high gain DC-DC multilevel boost converter using voltage-lift switched-inductor cell

TL;DR: In this article, a novel high gain DC-DC multilevel boost converter using voltage-lift switched-inductors (VLSI) cell is presented, which combines the function of VLSI cell and voltage multiplier cell.
Abstract: This paper presents a novel high gain DC-DC multilevel boost converter using voltage-lift switched-inductor (VLSI) cell. Cascading of conventional boost converters is not a viable solution to achieve high voltage gain. Thus, DC-DC multilevel converters are employed to achieve high conversion ratio. The proposed high gain DC-DC multilevel boost converter topology is non-isolated which combines the function of voltage-lift switched-inductors (VLSI) cell and voltage multiplier cell. In this paper voltage-lift switched-inductor (VLSI) cell is used to improve the boost capability of multilevel DC-DC converter. 2N capacitors, 2N+3 diodes, two inductors and single switch are needed to design proposed N-level DC-DC topology. Proposed DC-DC multilevel converter topology can be synthesized by using low voltage rating devices because blocking voltage across each power devices is less. The main advantage of this multilevel topology is high conversion ratio is achieved without using coupled inductor, transformer and extreme duty cycle. The conversion ratio of this multilevel DC-DC converter is depends upon the duty cycle and number of levels present in the voltage multiplier cell. The proposed DC-DC multilevel converter has been designed for three levels with rated power 200W, input supply voltage is 12V, output voltage is 288V and switching frequency is 50kHz. The proposed DC-DC multilevel converter topology is simulated in MATLAB/SIMULINK. The simulation results will verify the validity of the analytical design.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a new full soft switching high step-up DC-DC boost converter is proposed to achieve high voltage gain, a N-level voltage multiplier cell (VMC) and to achieve soft switching, a simple auxiliary resonant cell is implemented on a conventional pulse width modulation boost converter.
Abstract: In this paper, a new full soft switching high step-up DC–DC boost converter is proposed. To achieve high voltage gain, a N-level voltage multiplier cell (VMC), and to achieve soft switching, a simple auxiliary resonant cell is implemented on a conventional pulse width modulation boost converter. All semiconductor devices are switched under soft switching conditions, which decrease the switching losses significantly. These soft switching conditions consist of zero voltage and zero current switching (ZVZCS) condition for both main and auxiliary switches, ZVZCS for auxiliary cell diode and zero current switching for all output VMC diodes. To control the output voltage in this converter, two degrees of freedom, consisting of the main switch duty cycle and output VMC level (N), are available. These degrees of freedom lead the converter to operate in a wide output voltage range and have maximum power point tracking implementation or output voltage regulation capabilities. In this paper, operational modes analysis, design procedure, application discussion, soft switching and power efficiency evaluations and simulation results are presented. Finally, experimental results with input voltage of 32 V, output power of 80 W and switching frequency of 20 kHz are given to prove the accuracy of theoretical analysis.

22 citations

Journal ArticleDOI
TL;DR: In this article, the static gain expression taking into consideration the parasitic elements of the converter and the small-signal transfer function of the QBC typology under study has been obtained.

22 citations

Journal ArticleDOI
TL;DR: In this paper, a modified SEPIC-Boost DC-DC converter is proposed, which has good characteristics such as; highvoltage gain, continuous input current with low ripple, ZVT condition for all switches in a wide power range operation, and low voltage stress for diodes.

18 citations

Proceedings ArticleDOI
01 Nov 2016
TL;DR: In this paper, a high gain DC-DC converter along with zero voltage switching (ZVS) is proposed to minimize switching losses in a multi-level boost converter (MLBC) topology.
Abstract: In-dependency from fossil fuel to reduce pollution level has become a zenith issue in the field of power generation. Renewable energy sources have become a potential replacement of traditional generation. However the output voltage from the renewable energy sources like photovoltaic cells is low and is not sufficient for the integration to the utility grid. Many high gain DC-DC topologies have been proposed to achieve high DC voltage from renewable sources. In search of high gain, switching losses involved in the circuit are given minimal insight. In this work, a high gain DC-DC converter along with Zero Voltage Switching (ZVS) to minimize switching losses is proposed. In the proposed model, high gain is achieved by implementing multi level boost converter (MLBC). Various modes of operation to achieve ZVS in MLBC and the corresponding operating conditions are discussed in detail in this paper. The proposed ZVS in MLBC topology is simulated in MATLAB/SIMULINK. Simulation studies are carried out to verify the validity of the analytical design.

17 citations


Cites background from "A novel high gain DC-DC multilevel ..."

  • ...In the literature, many researchers proposed various topologies for high gain DC-DC conversion [2]–[8]....

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Proceedings ArticleDOI
01 Sep 2017
TL;DR: In this article, a non-isolated high gain switched inductor dc-dc multilevel cuk converter for photovoltaic applications is presented, which combines switched inductors with a voltage multiplier.
Abstract: In this paper, a non-isolated high gain switched inductor dc-dc multilevel cuk converter for photovoltaic applications is presented, which combines switched inductor with a voltage multiplier. By doing so, the conversion ratio is increased. High voltage gain cannot be possible if using traditional cuk converter. The output voltage can be boosted negatively by using a combination of capacitors and diodes without disturbing the main circuit is the key advantage of the proposed design. This switched inductor multilevel cuk converter topology is suitable for photovoltaic applications where the voltage is needed to be increased with negative polarity. 2N capacitors, 2N+2 diodes, three inductors, single switch, and single input supply are used to design Ν level switched inductor dc-dc multilevel cuk converter topology. The proposed converter is designed for three levels with rated power 300W, output voltage is −225V, input voltage is 12V, switching frequency is 50kHz, and 75% duty cycle. This design is simulated and tested by using Matlab/Simulink.

8 citations


Cites background from "A novel high gain DC-DC multilevel ..."

  • ...Two inductors charge in parallel when the switch is on and they discharge in series when the switch is off [6]....

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References
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Journal ArticleDOI
TL;DR: In this paper, the authors proposed an alternative topology of nonisolated per-panel dc-dc converters connected in series to create a high voltage string connected to a simplified dc-ac inverter.
Abstract: New residential scale photovoltaic (PV) arrays are commonly connected to the grid by a single dc-ac inverter connected to a series string of pv panels, or many small dc-ac inverters which connect one or two panels directly to the ac grid. This paper proposes an alternative topology of nonisolated per-panel dc-dc converters connected in series to create a high voltage string connected to a simplified dc-ac inverter. This offers the advantages of a "converter-per-panel" approach without the cost or efficiency penalties of individual dc-ac grid connected inverters. Buck, boost, buck-boost, and Cu/spl acute/k converters are considered as possible dc-dc converters that can be cascaded. Matlab simulations are used to compare the efficiency of each topology as well as evaluating the benefits of increasing cost and complexity. The buck and then boost converters are shown to be the most efficient topologies for a given cost, with the buck best suited for long strings and the boost for short strings. While flexible in voltage ranges, buck-boost, and Cu/spl acute/k converters are always at an efficiency or alternatively cost disadvantage.

989 citations

Journal ArticleDOI
TL;DR: In this article, the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on was introduced.
Abstract: This paper introduces the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on. The diodes reverse recovery current problem is minimized and the voltage multiplier also operates as a regenerative clamping circuit, reducing the problems with layout and the EMI generation. These characteristics allows the operation with high static again and high efficiency, making possible to design a compact circuit for applications where the isolation is not required. The operation principle, the design procedure and practical results obtained from the implemented prototypes are presented for the single-phase and multiphase dc-dc converters. A boost converter was tested with the single-phase technique, for an application requiring an output power of 100 W, operating with 12 V input voltage and 100 V output voltage, obtaining efficiency equal to 93%. The multiphase technique was tested with a boost interleaved converter operating with an output power equal to 400 W, 24 V input voltage and 400 V output voltage, obtaining efficiency equal to 95%.

702 citations

Journal ArticleDOI
TL;DR: This paper proposes transformerless dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio and develops a prototype circuit to verify the performance.
Abstract: Conventional dc-dc boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. This paper proposes transformerless dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch-on period and are discharged in series during the switch-off period. The structures of the proposed converters are very simple. Only one power stage is used. Moreover, the steady-state analyses of voltage gains and boundary operating conditions are discussed in detail. Finally, a prototype circuit is implemented in the laboratory to verify the performance.

694 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


"A novel high gain DC-DC multilevel ..." refers methods in this paper

  • ...In [9]-[11], DC-DC multilevel boost converters were used to achieve high voltage by using low voltage power devices....

    [...]

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


"A novel high gain DC-DC multilevel ..." refers methods in this paper

  • ...In [3]-[4], cascaded DC-DC boost converter is used to obtain high voltage gain....

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