Isolated High Step-Up DC–DC Converter With Low Voltage Stress

Evran, Fatih; Aydemir, M. Timur

doi:10.1109/tpel.2013.2282813

Cited by 105 publications

(57 citation statements)

References 44 publications

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“…Isolated single switch dc-dc converters are more attractive to achieve low cost [18]- [26]. Zsource converter [18], [19] and flyback converter [20]- [23] are hard switched at both turn-on and turn-off instants. Frequencycontrolled flyback converter [24] and series-connected forward-flyback converter [25] achieve zero-current switching (ZCS) turn-on of switch, but the switch is hard switched at turn-off instant.…”

Section: Introductionmentioning

confidence: 99%

A Fully Soft-Switched Single Switch Isolated DC–DC Converter

Kim

Choi

2015

IEEE Trans. Power Electron.

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This paper proposes a soft-switched single switch isolated converter. The proposed converter is able to offer low cost and high power density in step up application due to the following features: ZCS turn-on and ZVS turn-off of switch and ZCS turn-off of diodes regardless of voltage and load variation; low rated lossless snubber; reduced transformer volume compared to flyback based converters due to low magnetizing current. Experimental results on a 100kHz, 250W prototype are provided to validate the proposed concept.Index Terms-Isolated step-up dc-dc converter, single switch, soft switching. 0885-8993 (c)

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Section: Introductionmentioning

confidence: 99%

A Fully Soft-Switched Single Switch Isolated DC–DC Converter

Kim

Choi

2015

IEEE Trans. Power Electron.

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“…When the duty cycle approaches unity, a large pulse current will conduct through the diode in a short time, which leads to large the current stress of the diode and severe reverse recovery problem. This will greatly affect the efficiency and brings about a serious electromagnetic interference problem [9][10][11][12]. By cascading another boost converter, a high voltage gain can be easily obtained.…”

Section: Introductionmentioning

confidence: 99%

Non-isolated high step-up DC–DC converter adopting auxiliary capacitor and coupled inductor

Ruan

2017

J. Mod. Power Syst. Clean Energy

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For grid-connected power system based on photovoltaic (PV) source and fuel cells, high step-up and high-efficiency DC-DC converters are needed, due to the bus voltage of the grid-connected inverter is much higher than the output voltage of PV and fuel cells. In this paper, a novel high step-up converter is proposed. An auxiliary capacitor is introduced into the boost converter, which serves as a voltage source. It is in series with the input voltage source with the same voltage polarities. Thus, the input voltage is increased equivalently and the voltage gain is increased accordingly. To reduce the voltage stresses of the switch and the diode, multiple output capacitors are introduced. The voltage of each output capacitor is degraded leading to the reduced voltage stress. To replenish energy for the multiple output capacitors, a coupled inductor is adopted. Based on this, high step-up converter adopting auxiliary capacitor and coupled inductor is derived. The operating principles and voltage gain of the proposed converters are analyzed in this paper. In the end, experiment results are given to verify the theoretical analysis.

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“…Some researchers tried to modify the primary side configuration to obtain high gain. A Z-source based structure at primary side was proposed in paper [9]. A modified Z-source configuration was reported in paper [8].…”

Section: Introductionmentioning

confidence: 99%

A new Isolated Hybrid Boosting Converter

Smedley

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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A new Isolated Hybrid Boosting Converter (IHBC) is proposed in this paper. It employs fly-back structure at primary side of transformer and a Bipolar Voltage Multiplier (BVM) structure at secondary side to increase the voltage gain. The circuit alternates between forward and fly-back modes, which avoids the use of magnetic reset winding. The proposed converter has symmetrical configuration with interleaving capability at secondary side. Due to the cascading flying capacitors, the high voltage rating output filter capacitor which exists in most of other converters can be eliminated. In addition, an energy regenerative snubber is utilized to recycle the leakage energy at primary side. A 200W prototype that converts 35V to 400V was built and efficiency of 91.2% was achieved at rated power. The simulation and experimental results both verified the feasibility of proposed converter.

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Isolated High Step-Up DC–DC Converter With Low Voltage Stress

Cited by 105 publications

References 44 publications

A Fully Soft-Switched Single Switch Isolated DC–DC Converter

A Fully Soft-Switched Single Switch Isolated DC–DC Converter

Non-isolated high step-up DC–DC converter adopting auxiliary capacitor and coupled inductor

A new Isolated Hybrid Boosting Converter

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