Nonisolated High Step-Up Stacked Converter Based on Boost-Integrated Isolated Converter

“…As duty cycle increases, inductor current ripple and turn off current of the power device will increase, which leads to large conduction loss and degraded efficiency [ 2 ]. Cascaded boost converters can increase the voltage gain, however component count will increase hence size and cost of converter also [3]. Integrating coupled inductor into the non-isolated dc-dc converter by choosing a suitableturns ratio can increase the voltage gain effectively.…”

Section: Iiliterature Surveymentioning

confidence: 99%

“…Mode 5 ends when capacitor current i C2 resonates to zero at t 5 , and next operating begins. Before the cycle of the resonant inductor current 2 oscillation ends, the active power switch 1 is kept off condition, constraining the positive current to flow continuously through the energy-blocking diode 3 . In addition to the active power switch, the energy-blocking diode in the novel converter is also commutated under soft switching.…”

Section: Fig 4 Mode 2 Operationmentioning

confidence: 99%

A Novel ZVS Step up Converter for Renewable Energy Generation Applications

P¹

2015

IJAREEIE

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This paper introduces a novel ZVS step up converter especially for renewable energy generation applications. The proposed converter is consisting of single switch which operates in zero voltage and zero current. Resonant principles are opted for soft switching. High voltage gain is obtained by switched capacitor cell topology.Use of single switch will reduce the cost of conversion and complexity of control circuits. The circuit topology consisting of resonant inverter with zero voltage switching with an energy blocking diode having zero current switching. The energy blocking diode with DC output filter filters the output stage of converter. KEYWORDS:Switched capacitor, Resonant power converter, zero-current switching, zero-voltage switching, pulsewidth modulation I.INTRODUCTIONNow a days, global surface temperatures have increased drastically, because the global warming is taking place due to effluent gas emissions and increases in Carbon Monoxide. To prevent these effects, some potential solutions have evolved including energy conservation through improved energy efficiency, a reduction in fossil fuel use and an increase in environmental friendly energy sources. However, the output voltage of these sources is too low and which requires a voltage boost. In this stage, efficiency of conversion is a major concern. Efficiency in the sense minimizing the switching and conduction losses. II.LITERATURE SURVEYIn transformer isolated dc-dc converters, by increasing the turns ratio, we can boost the voltage gain. But, when we increase the turns ratio, leakage inductance will also increase, which will lead to high voltage stress and poor efficiency [1].In case of non-isolated dc-dc converter topologies, boost converter is using for voltage boost up. But duty cycle limitation is the problem associated. As duty cycle increases, inductor current ripple and turn off current of the power device will increase, which leads to large conduction loss and degraded efficiency [ 2 ]. Cascaded boost converters can increase the voltage gain, however component count will increase hence size and cost of converter also [3]. Integrating coupled inductor into the non-isolated dc-dc converter by choosing a suitableturns ratio can increase the voltage gain effectively. In order to absorb the energy stored in leakage inductor, a snubber circuitry is needed which will increase circuit complexity and loss of efficiency [4]. Switched capacitor cell converters can obtain a very high voltage gain, however input current pulsation is a problem and poor load and line voltage regulation. Incorporating switched capacitor structure into switching mode dc-dc converter is a good remedy for this problems. Hence we can dramatically increase voltage gain with an appropriate duty cycle with good voltage regulation and minimum input current pulsation [5].Pulse width modulationis the simplest method for controlling power semiconductor switches.PWM power converters can now operate at a much higher switching frequency hence reducing the size of passive co...

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“…By substituting (14) in (17) the ratio between the voltage across C 1 and the input voltage becomes. (…”

Section: Amentioning

confidence: 99%

A hybrid interleaved/switched-capacitor boost converter

Rosas-Caro

Torres-Espinosa

Mancilla–David

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper proposes a boost dc-dc converter topology with the capability of canceling the input current ripple at an arbitrarily preselected duty cycle, high-voltage gain without utilizing extreme values of duty cycle or boosting transformers, it contains a switched-capacitor structure in which the current among capacitors is continuous. The paper provides details on the principle of operation via topological considerations and a mathematical model. The key factor of reactive components sizing is also discussed. The converter was validated in the laboratory through the construction of a hardware prototype.

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Nonisolated High Step-Up Stacked Converter Based on Boost-Integrated Isolated Converter

Cited by 142 publications

References 37 publications

High step-up interleaved boost converter with low switch voltage stress

High step-up interleaved boost converter with low switch voltage stress

A Novel ZVS Step up Converter for Renewable Energy Generation Applications

A hybrid interleaved/switched-capacitor boost converter

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