A Buck and Boost Inverter with Dual Buck Circuits Sharing a Freewheeling Diode

Yunfeng Xu; Weimin Wu; Mohamed Orabi; Eftichios Koutroulis; Henry Shu-Hung Chung; Frede Blaabjerg

doi:10.1109/JESTPE.2026.3659155

A Buck and Boost Inverter with Dual Buck Circuits Sharing a Freewheeling Diode

Yunfeng Xu
, Weimin Wu^*
, Mohamed Orabi
, Eftichios Koutroulis
, Henry Shu-Hung Chung
, Frede Blaabjerg

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Abstract

The advantages of neutral-point-clamped single-phase single-stage (SS) transformer-less inverters (TLIs) based on dual-mode time-sharing technology are evident in terms of high efficiency, low voltage stress, boost and buck operation, and leakage current suppression. In this article, a novel SS transformer-less buck and boost inverter (SS-TL-BBI) based on neutral-point-clamped structure, dual-mode time-sharing technology, and full MOSFET switches is proposed, in which a single freewheeling diode is shared between the two Buck circuits of the positive half-cycle (PHC) and the negative half-cycle (NHC) of the grid. Besides, this article also describes the topology structure, buck and boost operating modes composed of eight switching states, mathematical modeling, control method, design guidelines, leakage current suppression principle, and comparison with other schemes. Finally, a 500-W prototype applied to a grid voltage of 110 VRMS and 50 Hz is fabricated to validate the theoretical analysis and performance tests, and a peak efficiency of 97.98% is measured. © 2026 IEEE.

Original language	English
Pages (from-to)	3143-3155
Number of pages	13
Journal	IEEE Journal of Emerging and Selected Topics in Power Electronics
Volume	14
Issue number	3
Online published	29 Jan 2026
DOIs	https://doi.org/10.1109/JESTPE.2026.3659155
Publication status	Published - Jun 2026

Funding

This work was supported in part by the National Natural Science Foundation of China under Grant U22A20216 and Grant 52177186, and in part by the Shanghai Outstanding Academic Leader Program Support under Grant 23XD1401500. This work was also supported in part by the Shanghai Frontiers Science Center of “Full Penetration” Far-Reaching Offshore Ocean Energy and Power.

Research Keywords

Buck and Boost
high efficiency
low voltage stress
negligible leakage current
Transformer-less inverter
transformer-less inverter (TLI)

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title = "A Buck and Boost Inverter with Dual Buck Circuits Sharing a Freewheeling Diode",

abstract = "The advantages of neutral-point-clamped single-phase single-stage (SS) transformer-less inverters (TLIs) based on dual-mode time-sharing technology are evident in terms of high efficiency, low voltage stress, boost and buck operation, and leakage current suppression. In this article, a novel SS transformer-less buck and boost inverter (SS-TL-BBI) based on neutral-point-clamped structure, dual-mode time-sharing technology, and full MOSFET switches is proposed, in which a single freewheeling diode is shared between the two Buck circuits of the positive half-cycle (PHC) and the negative half-cycle (NHC) of the grid. Besides, this article also describes the topology structure, buck and boost operating modes composed of eight switching states, mathematical modeling, control method, design guidelines, leakage current suppression principle, and comparison with other schemes. Finally, a 500-W prototype applied to a grid voltage of 110 VRMS and 50 Hz is fabricated to validate the theoretical analysis and performance tests, and a peak efficiency of 97.98\% is measured. {\textcopyright} 2026 IEEE.",

keywords = "Buck and Boost, high efficiency, low voltage stress, negligible leakage current, Transformer-less inverter, transformer-less inverter (TLI)",

author = "Yunfeng Xu and Weimin Wu and Mohamed Orabi and Eftichios Koutroulis and Chung, \{Henry Shu-Hung\} and Frede Blaabjerg",

year = "2026",

month = jun,

doi = "10.1109/JESTPE.2026.3659155",

language = "English",

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pages = "3143--3155",

journal = "IEEE Journal of Emerging and Selected Topics in Power Electronics",

issn = "2168-6777",

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TY - JOUR

T1 - A Buck and Boost Inverter with Dual Buck Circuits Sharing a Freewheeling Diode

AU - Xu, Yunfeng

AU - Wu, Weimin

AU - Orabi, Mohamed

AU - Koutroulis, Eftichios

AU - Chung, Henry Shu-Hung

AU - Blaabjerg, Frede

PY - 2026/6

Y1 - 2026/6

N2 - The advantages of neutral-point-clamped single-phase single-stage (SS) transformer-less inverters (TLIs) based on dual-mode time-sharing technology are evident in terms of high efficiency, low voltage stress, boost and buck operation, and leakage current suppression. In this article, a novel SS transformer-less buck and boost inverter (SS-TL-BBI) based on neutral-point-clamped structure, dual-mode time-sharing technology, and full MOSFET switches is proposed, in which a single freewheeling diode is shared between the two Buck circuits of the positive half-cycle (PHC) and the negative half-cycle (NHC) of the grid. Besides, this article also describes the topology structure, buck and boost operating modes composed of eight switching states, mathematical modeling, control method, design guidelines, leakage current suppression principle, and comparison with other schemes. Finally, a 500-W prototype applied to a grid voltage of 110 VRMS and 50 Hz is fabricated to validate the theoretical analysis and performance tests, and a peak efficiency of 97.98% is measured. © 2026 IEEE.

AB - The advantages of neutral-point-clamped single-phase single-stage (SS) transformer-less inverters (TLIs) based on dual-mode time-sharing technology are evident in terms of high efficiency, low voltage stress, boost and buck operation, and leakage current suppression. In this article, a novel SS transformer-less buck and boost inverter (SS-TL-BBI) based on neutral-point-clamped structure, dual-mode time-sharing technology, and full MOSFET switches is proposed, in which a single freewheeling diode is shared between the two Buck circuits of the positive half-cycle (PHC) and the negative half-cycle (NHC) of the grid. Besides, this article also describes the topology structure, buck and boost operating modes composed of eight switching states, mathematical modeling, control method, design guidelines, leakage current suppression principle, and comparison with other schemes. Finally, a 500-W prototype applied to a grid voltage of 110 VRMS and 50 Hz is fabricated to validate the theoretical analysis and performance tests, and a peak efficiency of 97.98% is measured. © 2026 IEEE.

KW - Buck and Boost

KW - high efficiency

KW - low voltage stress

KW - negligible leakage current

KW - Transformer-less inverter

KW - transformer-less inverter (TLI)

UR - https://www.scopus.com/pages/publications/105029095341

UR - https://www.scopus.com/pages/publications/105029095341#tab=impact

U2 - 10.1109/JESTPE.2026.3659155

DO - 10.1109/JESTPE.2026.3659155

M3 - RGC 21 - Publication in refereed journal

SN - 2168-6777

VL - 14

SP - 3143

EP - 3155

JO - IEEE Journal of Emerging and Selected Topics in Power Electronics

JF - IEEE Journal of Emerging and Selected Topics in Power Electronics

IS - 3

ER -

A Buck and Boost Inverter with Dual Buck Circuits Sharing a Freewheeling Diode

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