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1

An Analysis of a Transformerless Dual Active Half-Bridge Converter

Sosnowski Robert, Chojowski Maciej, Baszyński Marcin

Power Electronics and Drives

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2022

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Vol. 7 (42)

146--158

EN

This paper proposes a transformerless dual half-bridge converter (TLDAHB). By eliminating the transformer and harnessing the possibility of using a low inductor value, it is possible to minimise the size of the converter. A phase-shift pulse width modulation will result in a wide controlled voltage gain of the converter and operation as buck and boost. The theoretical topology analysis, simulation, and experimental results are presented. Theoretical analysis consists of analysis of power transfer and design. In case of experimental research, particular attention was paid to power transfer and efficiency analysis. Near zero switching transient of voltage in the half-bridge topology results with high efficiency.

2

Research on dual-mode switching of the new dual full-bridge topology of the beam supply

An Changzu, Lu Hongxia

Archives of Electrical Engineering

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2022

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Vol. 71, nr 4

1017--1034

EN

In order to meet the operation requirements of the beam supply with multi-working conditions, multi-modes and high efficiency, a dual-mode hybrid output control method combining phase-shifting and pulse-width dual-mode modulation technology with secondary side series-parallel operation is proposed. In this paper, the structure and working mode of the new dual full-bridge topology are firstly analyzed. Secondly, the main circuit parameters are designed according to the power performance indicators, and the losses under two control modes of phase shift and pulse width are calculated. Finally, comparing the losses of these two control methods, and combining the series-parallel operation mode of the secondary side of the transformer, a dual-mode switching control method of the beam supply is designed. In order to verify the rationality of the dual-mode mixed output control method, a principle prototype with a rated capacity of 2 kW, a rated voltage of 1 800 V and a switching frequency of 50 kHz was used for verification. Experiments show the effectiveness and superiority of the dual-mode hybrid output control method.

3

Phase-Shift Driven Class D Series Resonant Inverter With Two Anti Parallel-Connected Auxiliary Switches

Karyś S.

Pomiary Automatyka Kontrola

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2008

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R. 54, nr 2

56-59

EN

This paper presents analysis of a novel voltage source class D inverter. The classic topology has been extended of the two auxiliary switches, that are anti parallel connected and each of them has its own resonant inductor. Proposed solution enables phase-shift control of the inverter, keeping zero-current-switching for auxiliary transistors. This paper explains the operation principle that is illustrated by simulation, presents general equations, design and shows experimental results.

PL

W artykule zaprezentowano analizę nowego rozwiązania przekształtnika klasy D, zasilanego ze źródła napięcia. Układ klasycznego przekształtnika został rozszerzony o dwa dodatkowe klucze, które są połączone przeciw równolegle i posiadają własne indukcyjności stanowiące elementy obwodu rezonansowego. Zaproponowane rozwiązanie umożliwia sterowanie fazowe przekształtnika, przy zachowaniu wyłączania tranzystorów pomocniczych w warunkach zerowego prądu - ZCS. Artykuł przedstawia podstawowe równania, budowę i wyniki badań eksperymentalnych przekształtnika.