Integrated auxiliary commutation circuits: a generalised approach

Schuch, Luciano; Rech, Cassiano; Pinheiro, J.R.

doi:10.1049/iet-pel:20070346

Cited by 11 publications

(5 citation statements)

References 7 publications

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“…Additionally, a large semiconductor count could reduce the reliability of the PV system. This way, this paper exploits the advantages of using a cascaded connection of dc-dc step-up stages for a series string of PV panels in a single-phase residential/commercial grid connected installation with an integrated soft-switching topology [8]. It is proposed the use of a very compact integrated zero-voltage-transition (ZVT) circuit, which assists all the dc-dc step-up stages, enabling to minimize both the turn-on losses of MOSFETs and diode reverse-recovery losses.…”

Section: Introductionmentioning

confidence: 99%

Integrated ZVT Cell Applied to Decentralized Multi-String PV System

Beltrame¹,

Desconzi²,

Martins³

et al. 2024

RE&PQJ

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Abstract. This paper exploits the advantages of using a cascaded connection of dc-dc step-up stages for a series string of photovoltaic (PV) panels in a single-phase residential/commercial grid connected installation. It is demonstrated that when multistring PV systems are adopted in order to minimize shadowing problems, it is required to employ some approach to reduce the switching losses (turn-on losses of MOSFETs and mainly diode reverse-recovery losses) of the dc-dc step-up stages. As a multistring PV system is normally comprised by several dc-dc stepup stages, integrated soft-switching topologies are attractive due to their compactness, reliability and low cost. Thus, this work proposes to use an integrated zero-voltage transition (ZVT) cell, which assists all dc-dc step-up stages and employs a very compact circuit, enabling to minimize the switching losses, improving the system efficiency. The proposed cell makes use of a magnetically-coupled auxiliary voltage source implemented by adding a secondary winding on the input inductors. In order to validate the proposed topology, experimental results are presented.

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Section: Introductionmentioning

confidence: 99%

Integrated ZVT Cell Applied to Decentralized Multi-String PV System

Beltrame¹,

Desconzi²,

Martins³

et al. 2024

RE&PQJ

Self Cite

View full text Add to dashboard Cite

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“…Compared with the QRCs and MRCs, the merit of ZVS operation is retained while the voltage stress is reduced in the ZVT converters because the resonant inductor is removed from the main circuit [8][9][10][11][12][13][14][15][16][17][18][19]. Moreover, the converter is controlled by pulse-width modulation instead of variable frequency, which simplifies the circuit design.…”

Section: Introductionmentioning

confidence: 99%

“…However, higher switching frequency results in deteriorated switching loss and lower efficiency in the conventional hard‐switching converters. To overcome the conflicts between high switching frequency and low efficiency, zero‐voltage‐switching (ZVS) techniques [2–28], including quasi‐resonant ZVS, multi‐resonant ZVS, zero‐voltage‐transition (ZVT) and active‐clamping ZVS, have been employed to eliminate the turn‐on loss which is the main issue in high‐frequency applications with majority carrier devices such as metal–oxide–semiconductor field‐effect transistor (MOSFET).…”

Section: Introductionmentioning

confidence: 99%

Zero‐voltage‐switching buck converter with low‐voltage stress using coupled inductor

Chen

Deng

et al. 2016

IET Power Electronics

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This study presents a new zero-voltage-switching (ZVS) buck converter. The proposed converter utilises a coupled inductor to implement the output filter inductor as well as the auxiliary inductor which is commonly employed to realise ZVS for switches. Additional magnetic core for the auxiliary inductor in traditional ZVS converters is eliminated and hence reduced cost is achieved. Moreover, thanks to the series connection between the input and output, the switch voltage stress in the steady state is reduced and thus the ZVS operation can be easier achieved. Then the leakage inductor current circulating in the auxiliary switch is decreased, contributing to reduced conduction losses. In particular, low-voltage rating devices with low on-state resistance can be adopted to further improve efficiency in applications with non-zero output voltage all the time, such as the battery charger. Furthermore, the reverse-recovery problem of the diode is significantly alleviated by the leakage inductor of coupled inductor. In the study, operation principle and steady-state analysis of the proposed converter are presented in detail. Meanwhile, design considerations are given to obtain circuit parameters. Finally, simulations and experiments on a 200 W prototype circuit validate the advantages and effectiveness of the proposed converter

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“…When there are several power conversion stages where the use of inverters is a must, e.g. UPSs, integrated auxiliary commutation circuits can be adopted in order to reduce component count at the cost of appreciable design complexity [26]. Among other existing approaches, the soft‐transition commutation cell is the most suitable one, because soft‐switching conditions are achieved by means of an auxiliary shunt resonant network.…”

Section: Introductionmentioning

confidence: 99%

Analysis, design, and implementation of soft‐switching cells applied to the single‐phase full‐bridge inverter

Tofoli

Gallo

2016

IET Power Electronics

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This study presents an auxiliary cell that can be applied to the single-phase full-bridge inverter. The cell employs two auxiliary switches, two auxiliary diodes, one resonant capacitor, and one resonant inductor, as it can be used in both inverter legs so that switching losses are minimised, thus implying increased efficiency and low electromagnetic interference levels. Three possible configurations are investigated and theoretical analyses are carried out. Besides, the control strategy provides nearly sinusoidal output voltage with reduced harmonic distortion. Experimental results are presented and discussed to validate the proposal.

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Integrated auxiliary commutation circuits: a generalised approach

Cited by 11 publications

References 7 publications

Integrated ZVT Cell Applied to Decentralized Multi-String PV System

Integrated ZVT Cell Applied to Decentralized Multi-String PV System

Zero‐voltage‐switching buck converter with low‐voltage stress using coupled inductor

Analysis, design, and implementation of soft‐switching cells applied to the single‐phase full‐bridge inverter

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