High step‐up dual full‐bridge ZVS DC–DC converter with improved integrated magnetics and new resonant switched capacitor cell

Abstract

A high voltage gain dual interleaved full bridge converter with Zero Voltage Switching (ZVS), improved integrated magnetics, and a new resonant Switched-Capacitor-Cell (RSC) is presented. By taking the advantage of a new resonant switched capacitor cell and transformers with low turn-ratio as well as low leakage inductances, the desired high output voltage can be obtained. Furthermore, the output diodes operate in Zero Current Switching (ZCS) condition, and switches are maintained under ZVS condition over the whole range of output load variations. In addition, switches turn off near zero current leading to high overall efficiency. An interleaved approach (multi-cell) is adopted over a single cell to increase the power handling capacity. Furthermore, transformers of dual cells are integrated into a single UU core which cuts down the total volume of the converter as well as the total core loss. Since secondary windings have opposite polarities, there exists no DC flux, and the top and bottom RSC cells operate in 180 degree out of phase. Taking the aforementioned characteristics into consideration, the proposed converter has a good performance for high voltage applications. Experimental results of a 3 kw prototype with an output voltage of 16 kV validate the features of this topology.

Design, modelling, and implementation of a modified double‐switch flyback‐forward converter for low power applications

“…The average input current over one period can be shown by (19). Also, the DC equivalent circuit can be determined by using (1)-(5), (14) and (15), as shown in Fig.…”

“…Like the other DC/DC converters, the introduced DSFF converter has an equivalent small-signal circuit that explains the behaviour of the converter. In order to obtain this circuit, (3)-(5), (14), (15) and (19) are employed, and the small signal variables are added to these equations with the hat sign (^). In all the mentioned equations, the voltage, current and duty cycle can have a little change.…”

“…Furthermore, the isolated converters can handle multi-output with different voltage value. Five main isolated DC/DC converters are as follows: the flyback [5][6][7][8][9][10][11], forward [12][13][14], push-pull [15], half-bridge [16], and full-bridge converters [17][18][19][20][21][22]. The manufacturing cost, the power transfer capability and the rated voltage and current of the desired converter usually limit our selection between the above topologies.…”

High step‐up double input converter with soft switching and reduced number of semiconductors

“…To harvest the energy appropriately, a power electronic converter must be utilised to smooth either voltage, current or to collect maximum power. Many kinds of converters and topologies have been introduced in this manner [1][2][3][4]. The converters development has been moving towards higher efficiency, higher power density, and lower costs [4].…”

Avaliação Econômica E Energética De Um Sistema Integrando Máquina Biopeixes E Reator Multifuncional Para Produção De Energia Elétrica

“…Uma destas fontes de energia, a célula combustível, não emite poluentes e apresenta alta taxa de eficiência (RASID et al, 2016) Com base nos trabalhos apresentados anteriormente, nota-se que as principais formas de elevação da tensão da célula combustível baseiam-se em conversores isolados ou em multiplicadores de tensão. Além disso, estes trabalhos ressaltam que a utilização de um conversor Boost convencional para aplicação em alto ganho não é a ideal, pois devido aos elementos parasitas e as perdas associadas aos componentes do conversor, fazem com que o ganho estático seja limitado (ZHANG et al, 2014;WU et al, 2017;TAHERI et al, 2017;SIWAKOTI e BLAABJERG, 2017…”