Nonisolated High Step-Down Converter With ZVS and Low Current Ripples

Zheng, Yifei; Li, Shouxiang; Smedley, K.M.

doi:10.1109/tie.2018.2833047

Cited by 49 publications

(17 citation statements)

References 21 publications

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“…New high step-down interleaved topologies based on the series capacitor and the coupled inductor are introduced in [35][36][37][38][39][40]. The converters proposed in [35][36][37] can provide ultra-high step-down conversion ratios.…”

Section: Introductionmentioning

confidence: 99%

“…However, they utilise one or more extra magnetic cores which increases the cost and the volume of the converter. In [38][39][40], the ZVS condition is provided for all switches. Also, the leakage energy of coupled inductors is recovered without any extra auxiliary circuit.…”

Section: Introductionmentioning

confidence: 99%

“…x^= E′x^+ F′û + Md^ ( 40) In this equation, matrices E′ and F′ are similar to E and F. By replacing variable d with D in matrices E and F, matrices E′ and F′ are achieved. Also, matrix M is calculated as…”

Section: Modelling Of the Introduced Topologymentioning

confidence: 99%

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Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

Asghari

2020

IET Power Electronics

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In this study, a new zero voltage switching (ZVS) synchronous buck converter with ultra-high step-down conversion ratio is introduced. By combining coupled inductors and energy-transferring capacitors, operating duty cycle is significantly extended while the voltage stress across the switches is reduced. Thereby, extremely low voltage gain can be achieved and the conduction loss is reduced owing to using switches with lower voltage rating. Also, by applying the interleaved method and complementary pulses for switches, the current stress and the output current ripple are reduced. In the proposed converter, soft switching condition is achieved for all switches without any auxiliary circuit. As a result, the overall efficiency of the introduced converter is improved. The converter operation and its design considerations are discussed. Experimental results are presented to validate the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

Asghari

2020

IET Power Electronics

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“…Isolated converters with transformer [17] and non‐isolated ones with the coupled inductor [18–27] can achieve high step‐down gain by adjusting the turns ratio. Therefore, the narrow duty cycle is avoided alleviating the associated power losses in the diodes and/or synchronous rectifiers at the high current side.…”

Section: Introductionmentioning

confidence: 99%

“…However, the duty ratio is limited to a maximum value of 25%, which is a serious problem in the voltage gain adjustment. IBCs with zero voltage switching (ZVS) are presented in [22–27] in which the switching losses are minimised to improve the conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Interleaved current‐auto‐balance high step‐down converter with coupled inductors

Nouri

Shaneh

2020

IET power electron.

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This study presents a current‐auto‐balance non‐isolated interleaved high step‐down converter with a coupled inductor. The proposed converter achieves low‐voltage gain by the turns ratio of the coupled inductor and capacitive voltage division which avoids low duty cycles. The voltage stress across the power MOSFETs is decreased and the voltage stress across the diodes is controlled by the turns ratio of the coupled inductors. Therefore, low voltage semiconductors are adopted reducing the switching and conduction losses. Meanwhile, the zero current switching (ZCS) turn‐ON for MOSFETs and ZCS for whole switching transitions of diodes are provided by the leakage inductances that reduces the switching losses and alleviates the reverse recovery problems. Besides, by replacing the inductors with the coupled ones, the power density is improved. Due to the interleaved structure, the output current ripple is minimised and the thermal stress is distributed between the phases. All of these factors improve the conversion efficiency and overall performance of the proposed converter. Moreover, the auto‐current‐sharing performance is realised due to the charge balance of the blocking capacitors. Finally, a 400 W prototype with 400–25 V voltage conversion is fabricated to demonstrate the performance of the proposed converter.

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A new interleaved high step‐down converter with wide range of soft switching

Khorami

Delshad²,

Saghafi

2021

Int Trans Electr Energ Syst

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This article suggested a new interleaved high step-down converter that consists of just one auxiliary switch to establish zero-voltage transition for all main and auxiliary switches. Because of the paralleled structure, the reliability of the designed converter has increased, and output current ripple is decreased. Also by using coupled inductors, the high current gain is achieved. In this converter, zero-voltage switching (ZCS) condition is established for all diodes, thus reverse recovery problems in these diodes do not exist. The proposed converter is fully described and analyzed, and to acknowledge the theoretical analysis, a 200 W prototype has been implemented. The proposed converter efficiency is about 96% at full load, and a decrease about 9 dB/μV is obtained in electromagnetic interferences (EMI) measurement of the proposed converter in comparison with hard-switched counterpart.

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Nonisolated High Step-Down Converter With ZVS and Low Current Ripples

Cited by 49 publications

References 21 publications

Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

Interleaved current‐auto‐balance high step‐down converter with coupled inductors

A new interleaved high step‐down converter with wide range of soft switching

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