Dual-Transformer-Based DAB Converter With Wide ZVS Range for Wide Voltage Conversion Gain Application

Xu, Guo; Sha, Deshang; Xu, Yaxiong; Liao, Xiaozhong

doi:10.1109/tie.2017.2756601

Cited by 74 publications

(42 citation statements)

References 23 publications

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“…Additionally, after Mode 10 is finished, this current will flow in the negative direction to the lower switch, creating an area for making ZVT turn on. At the end of Mode 10, the current of the upper switch appears as shown in (20).…”

Section: Soft Switching Analysismentioning

confidence: 99%

“…When an active clamp circuit is added to the CFFB converter, the circuit configuration of the DAB converter appears as part of the entire circuit, and the DAB converter PWM technique is available for the CFFB converter. Accordingly, this allows for a wide ZVS range, which is the advantage of the DAB [19][20][21], and a low circulating current as well as a converter configuration with low current ripple characteristics of the output capacitor, which are advantages of the CFFB converter [22,23]. In addition, since a 3-phase configuration, such as CFFB, is possible, as in a CFFB converter, it is possible to design the optimal passive element through an interleaving operation.…”

Section: Introductionmentioning

confidence: 99%

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A Control Strategy for Bidirectional Isolated 3-Phase Current-Fed Dual Active Bridge Converter

et al. 2018

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This paper examines the characteristics of the zero voltage switching (ZVS) and zero voltage transition (ZVT) soft-switching applied in the 3-phase current fed dual active bridge (3P-CFDAB) converter, which combines the advantages of the dual active bridge (DAB) converter and current-fed full bridge (CFFB) converter. When an active clamp circuit is added to the CFFB converter, the circuit configuration of the DAB converter is shown in part of the entire circuit. This allows the use of pulse width modulation (PWM) techniques which combine the PWM techniques of both the DAB converter and CFFB converter. The proposed converter performs both duty and phase control at the same time in order to reduce the circulating current and ripple current of the output capacitor, which are the disadvantages of the CFFB converter and DAB converter. In addition, the ZVS and ZVT soft switching areas were analyzed by means of the phase current and leakage inductor current in each transformers. To verify the principle and feasibility of the proposed operation techniques, a simulation and experiment were implemented with the 3P-CFDAB.

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Section: Soft Switching Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Control Strategy for Bidirectional Isolated 3-Phase Current-Fed Dual Active Bridge Converter

et al. 2018

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“…In the literature, the DAB converter has been used in battery energy storage systems (BESS) [34][35][36], solid-state transformers [37][38][39] and fuel cell applications [40]. Concerning PV systems, the DAB converter has been used in [39,[41][42][43][44][45][46][47][48] to interface PV arrays in series connection, but the high voltage-conversion ratio capability has not been exploited in those works. Moreover, although many design considerations have been provided for the DAB converter [32,40,49], there is not reported a design method for a PV system based on the DAB converter.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the transistors on the bridge at the load side of the DAB converter are replaced by diodes to avoid bidirectionality, but no converter behavior analysis or design procedure are presented. On the contrary, the work reported in [46] provides a procedure to select both the turns ratio and leakage inductor value of the HFT based on the maximum power of the system. However, such a solution does not take into account the effect of the non-linear behavior of the photovoltaic module on the converter design; instead, the authors model the PV source using an ideal DC voltage source, which is not accurate.…”

Section: Introductionmentioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage photovoltaic modules with a high-voltage dc bus, such as the input of a micro-inverter. To propose the design method, the circuital analysis of the dual active bridge converter is performed to describe the general waveforms derived from the circuit behavior. Then, the analysis of the dual active bridge converter, interacting with a photovoltaic module driven by a maximum power point tracking algorithm, is used to establish the mathematical expressions for the leakage inductor current, the photovoltaic current, and the range of operation for the phase shift. The design method also provides analytical equations for both the high-frequency transformer equivalent leakage inductor and the photovoltaic side capacitor. The design method is validated through detailed circuital simulations of the whole photovoltaic system, which confirm that the maximum power of the photovoltaic module can be extracted with a correct design of the dual active bridge converter. Also, the theoretical restrictions of the photovoltaic system, such as the photovoltaic voltage and power ripples, are fulfilled with errors lower than 2% with respect to the circuital simulations. Finally, the simulation results also demonstrate that the maximum power point for different environmental conditions is reached, optimizing the phase shift factor with a maximum power point tracking algorithm.

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“…2). t 4 −t 5 : when the resonant current becomes higher than the input current, the soft switching condition is satisfied; the body diode of S1 starts to conduct and the transistor channel can be turned off with ZCS. The currents at the primary side reach the amplitude value when the capacitor voltage crosses zero and, as the capacitor C eq voltage polarity changes, starts to decrease back to the value of the input current.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric snubberless current-fed full-bridge isolated DC-DC converters

Kosenko

Blinov

Vinnikov

et al. 2018

Electrical, Control and Communication Engineering

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-This paper presents two isolated current-fed fullbridge DC-DC converters that can be used to interface a lower voltage source into a DC bus of higher voltage. The first topology uses a resonant circuit to force current redistribution between low-voltage-side transistors and a passive rectifier. The second topology utilizes an active rectifier with secondary modulation to achieve the same goal. The resonant circuit can be formed by using transformer leakage inductance and the parasitic capacitances of the switches. The converters feature soft switching of semiconductors over a wide range of operating conditions. This is achieved with decreased energy circulation when compared to existing topologies with symmetric control and with fewer semiconductors than in those with phase-shift control. The topologies can be implemented in renewable, supercapacitor, battery, fuel cell, and DC microgrid applications. Steady-state operation and design aspects of the converters are presented and verified experimentally with 400 W prototypes.

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Dual-Transformer-Based DAB Converter With Wide ZVS Range for Wide Voltage Conversion Gain Application

Cited by 74 publications

References 23 publications

A Control Strategy for Bidirectional Isolated 3-Phase Current-Fed Dual Active Bridge Converter

A Control Strategy for Bidirectional Isolated 3-Phase Current-Fed Dual Active Bridge Converter

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Asymmetric snubberless current-fed full-bridge isolated DC-DC converters

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