A novel high step-up multilevel boost converter using double voltage-lift switched-inductor cell
20 Mar 2014-pp 996-1001
TL;DR: Double voltage-lift switched-inductor (D-VLSI) cell is used to enhance the step-up capability of multilevel DC-DC converter to achieve high voltage gain.
Abstract: In this paper a novel high step-up multilevel boost converter using double voltage-lift switched-inductor (D-VLSI) cell is proposed. Series connection of conventional DC-DC boost converter is not a proper solution to achieve high voltage gain. Thus, DC-DC multilevel converters are employed to achieve high voltage gain. The proposed high step-up multilevel boost converter is a combination of double voltage-lift switched-inductor (D-VLSI) cell and voltage multiplier cell. In this paper double voltage-lift switched-inductor (D-VLSI) cell is used to enhance the step-up capability of multilevel DC-DC converter. Two switches, 2N+3 diodes, 2N+1 capacitor and two inductors are required to design the proposed N-level high step-up multilevel boost converter topology. Proposed high step-up multilevel converter circuit can be designed by using low voltage rating devices because blocking voltage across each power devices is low. The main advantage of proposed converter circuit is high voltage is achieved without using transformer, coupled inductor and high duty cycle. The gain of proposed multilevel converter is depends upon the duty ratio and levels present in voltage multiplier cell. Proposed DC-DC converter is designed for unidirectional power transfer applications. The proposed high step-up multilevel converter has been designed for three levels with rated power 300W, output voltage is 324V, input supply voltage is 12V, and switching frequency is 50kHz. The proposed high step-up multilevel converter circuit is simulated in MATLAB/SEVIULINK.
Citations
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TL;DR: Three unidirectional step-up ac–dc converter topologies with voltage multiplication on their outputs based on the integration of boost rectifier and the ladder switched-capacitor (SC) cell are presented.
Abstract: This paper presents three unidirectional step-up ac–dc converter topologies with voltage multiplication on their outputs. The first topology is the hybrid boost rectifier and the other two are novel bridgeless structures, all based on the integration of boost rectifier and the ladder switched-capacitor (SC) cell. The new hybrid structures provide high voltage gain with low voltage stress across the switches, high-power factor, and output voltage regulation. This paper presents the principle of operation, steady-state and dynamic analysis, design methodology, and experimental verification. A different approach is also presented for the design methodology of the SC cell and for the analysis of its influence on the dynamic model. Three 1000-W prototypes with a 220-V input voltage, 800-V output voltage, and 100-kHz switching frequency were designed to corroborate the theoretical study. The best efficiency was 97.1 $\%$ in the proposed bridgeless versions and the voltage stress across the switches stands around 400 V. Furthermore, a comparison between the proposed structures and previous topologies is also presented.
26 citations
03 May 2018
TL;DR: A novel of a transformerless step-up DC-DC converter based on a switched-inductor (SL) and switched-capacitor (SC) techniques that has the ability to achieve very high voltage gain (>20) with reasonable voltage stress across the semiconductor switches.
Abstract: This paper presents a novel of a transformerless step-up DC-DC converter based on a switched-inductor (SL) and switched-capacitor (SC) techniques. The main advantage of the proposed SLSC step-up converter is the ability to achieve very high voltage gain (>20) with reasonable voltage stress across the semiconductor switches. The presented paper shows a detailed analysis of the proposed SLSC step-up converter and a comparison considering other published step-up converter topologies. Theoretically, the proposed SLSC step-up converter can boost the input voltage to 23.5 times when $\mathbf{D}=0.75$, which D means the duty cycle of the MOSFET. Such a large voltage gain can be used in renewable energy applications such as photovoltaic application to boost the output voltage which the output voltage is low. The proposed converter is analyzed in continuous conduction mode (CCM). The proposed converter has been designed for 12V input voltage, 280V output voltage, 200W rated power, 50kHz switching frequency, and 75% duty cycle. The proposed converter has been simulated in MATLAB/SIMULINK.
10 citations
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
01 Oct 2016
TL;DR: A control strategy is presented that enables survival of the converter after the occurrence of a sudden short circuit of a single transistor switch.
Abstract: The stacked polyphase bridges converter consists of several submodules that, on the input dc side, all are connected in series. Whereas controller designs presented in previous studies have been found promising for realizing equal voltage sharing between submodules, the survival and stability under fault conditions have not been studied. This paper presents a control strategy that enables survival of the converter after the occurrence of a sudden short circuit of a single transistor switch. The results are verified by simulations.
4 citations
01 Oct 2016
TL;DR: Three new topologies are introduced in this paper, two are bridgeless rectifier, and principle of operation, steady state analysis, dynamic models and simulation results are presented.
Abstract: This paper proposes a unidirectional step-up rectifier family with high voltage gain. The converters are based on the integration between traditional rectifiers and voltage multiplier switched-capacitor cell. The novel structures are referred to as hybrid boost rectifiers and they provide high gain with low voltage stress on the switches and with low gain in boost stage, which are advantages regarding to design and control. Three new topologies are introduced in this paper, two are bridgeless rectifier, and principle of operation, steady state analysis, dynamic models and simulation results are presented. All topologies provide high power factor in input current and a regulated output voltage.
1 citations
References
More filters
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
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
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
"A novel high step-up multilevel boo..." refers background in this paper
...In [6]-[7], non-isolated converter topologies are used to overcome the drawbacks of isolated converter topologies....
[...]
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
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 step-up multilevel boo..." refers background in this paper
...In [8]-[11], family of multilevel boost converters is discussed to achieve high voltage gain....
[...]