A Novel DCM Soft-Switched SEPIC-Based High-Frequency Converter With High Step-Up Capacity

Gao, Shanshan; Wang, Yijie; Liu, Yining; Guan, Yueshi; Xu, Dianguo

doi:10.1109/tpel.2020.2975130

Cited by 18 publications

(31 citation statements)

References 27 publications

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“…As established from (10), the voltage gain of the proposed converter is a quadratic function of the duty cycle, leading to extended significant voltage gains. The voltage gain is adjustable with two parameters: duty cycle (D) of the switches and turns-ratio (N) of the CIs; these two degrees of freedom make the design of the converter more flexible.…”

Section: Circuit Performance Comparisonmentioning

confidence: 99%

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An Interleaved Quadratic High Step-Up DC-DC Converter With Coupled Inductor

Rahimi¹,

Habibi²,

Ferdowsi³

et al. 2021

IEEE Open J. Power Electron.

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A new high step-up DC-DC converter for renewable energy applications is proposed in this paper. Employing an interleaved quadratic structure, two two-winding coupled inductors (CIs), and voltage multiplier cells (VMCs), the proposed converter can provide high-voltage gains, continuous input current with low ripple, reduced voltage stresses on semiconductors, common ground between input and output sides, and low numbers of components. In addition, diode-capacitor lossless clamp circuits are utilized to limit the voltage stresses of the power switches and further extend the voltage gain. The operating and steadystate analyses, design considerations, and a comparison with other previously published high step-up converters are presented.

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Section: Circuit Performance Comparisonmentioning

confidence: 99%

“…The rated voltages of the capacitors were determined from ( 8)- (10). By applying the amp-balance law to the capacitors, their average currents could be determined for all the operation stages.…”

Section: B Capacitors Designmentioning

confidence: 99%

An Interleaved Quadratic High Step-Up DC-DC Converter With Coupled Inductor

Rahimi¹,

Habibi²,

Ferdowsi³

et al. 2021

IEEE Open J. Power Electron.

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show abstract

“…On the other hand, the waveform of the input current is shown in Figure 3, so its average value is given by Equation (11):…”

Section: Small-signal Model Based On the Average Modeling Techniquementioning

confidence: 99%

“…On the other hand, there is a strong tendency to increase the switching frequency in order to achieve higher power density, and thus, reduce the volume of the switched mode power supplies SMPS [10][11][12][13]. Increasing the switching frequency of the converter leads to an increase the switching losses of the MOSFET.…”

Section: Introductionmentioning

confidence: 99%

Small-Signal Modeling of Phase-Shifted Full-Bridge Converter Considering the Delay Associated to the Leakage Inductance

et al. 2021

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This paper demonstrates that in the Phase-Shifted Full-Bridge (PSFB) buck-derived converter, there is a random delay associated with the blanking time produced by the leakage inductance. This random delay predicts the additional phase drop that is present in the frequency response of the open-loop audio-susceptibility transfer function when the converter shows a significant blanking time. The existing models of the PSFB converter do not contemplate the delay and gain differences associated to voltage drop produced in the leakage inductor of the transformer. The small-signal model proposed in this paper is based on the combination of two types of analysis: the first analysis consists of obtaining a small-signal model using the average modeling technique and the second analysis consists of studying the natural response of the power converter. The dynamic modeling of the Phase-Shifted Full-Bridge converter, including the random delay, has been validated by simulations and experimental test.

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“…Later, soft-switching techniques are implemented, in previous studies. [30][31][32] Single-switch highefficient SEPIC converters based on coupled inductor and voltage multipliers are presented in Hasanpour et al, 30,31 where input current ripple is reduced and quasiresonance helps to achieve ZCS across switch, reducing switching losses across diodes. However, the gain is still low.…”

mentioning

confidence: 99%

A single‐switch high‐gain DC–DC converter for photovoltaic applications

Kalahasthi

Ramteke

Suryawanshi

et al. 2021

Circuit Theory & Apps

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This article presents a high-gain DC-DC converter consisting of a quadratic boost converter and a voltage multiplier, which helps to lift up the voltage gain. The gain will be further enhanced by increasing the turn's ratio of the coupled inductor. The key features include ultrahigh gain, low voltage stress across switching devices, low input current ripple, and hence, it is preferably suitable for renewable energy applications. A passive clamp lowers the voltage stress across MOSFET, so allowing switch with lower R ds(on) reduces the system cost. Besides this, input inductor makes current continuous and reduces input current ripple. The reverse recovery problem of diodes also gets diminished with the usage of leakage energy of the coupled inductor. The operating principle with different modes of operation is also explained. Zero current switching (ZCS) turn-on is achieved for power switch, and ZCS turn-off is achieved for diodes, which helps to reduce the switching losses. This improves the overall system efficiency. A 250-W prototype is built up to validate the converter.

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A Novel DCM Soft-Switched SEPIC-Based High-Frequency Converter With High Step-Up Capacity

Cited by 18 publications

References 27 publications

An Interleaved Quadratic High Step-Up DC-DC Converter With Coupled Inductor

An Interleaved Quadratic High Step-Up DC-DC Converter With Coupled Inductor

Small-Signal Modeling of Phase-Shifted Full-Bridge Converter Considering the Delay Associated to the Leakage Inductance

A single‐switch high‐gain DC–DC converter for photovoltaic applications

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