A parallel-series connected four-transformer half bridge DC-DC converter for electric vehicle application

Lee, Seung-Woon; Yi, Je-Hyun; Kim, Woosup; Cho, B. H.

doi:10.1109/ecce-asia.2013.6579179

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…Simulation analysis observed for boost mode in order to verify the theoretical assumptions. Fig.7 (a,b,c,d) shows the simulated waveforms drain-source voltage and currents of all the MOSFETs S 1 ,S 2 and S 3 ,S 4 . It is observed the zero voltage switching operation achieved with the all switching devices.…”

Section: Simulation Results and Comparative Analysismentioning

confidence: 99%

“…At t 3 , the switch S 3 is turned-off in hard-switching condition. And then S 1 is turned-off in zero current operation at t 4 . The diodes of S 1 ,S 4 are turned-on and turned-off, respectively.…”

Section: B Buck Mode Operationmentioning

confidence: 99%

“…However, the converter is cost-effective due to the SiC (silicon carbide) switching devices are used. A dual half bridge DC-DC converter [4][5][6] are obtained zero voltage switching to the semiconductor devices with the aid of leakage inductances of their high frequency transformer and snubber capacitors with the MOSFETs. They achieved a poorer efficiency, due to high switching frequency operated at higher output power levels.…”

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confidence: 99%

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Comparative Simulation Analysis on High Gain Bidirectional and High Step-up DCDC Converters

Thumma¹,

Bhajana²

2017

IJET

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Abstract-This article mainly focuses on a comparative analysis on high gain bidirectional and high stepup soft-switching DC-DC converters for high gain high power applications. These converters are useful for high step up and step down conversion with reduced switching losses. These converters obtain zero voltage switching turn-on and zero current switching turn-off operation of the semiconductor switches by utilizing the simple series resonant capacitor and inductors respectively. The advantages of these converters are minimized voltage and current stresses, which improves overall converter efficiency. This paper describes the operational principles of bidirectional and high step-up converters as well and their simulation evaluations were compared in order to show their effectiveness of these topologies. Keywords -Buck, Boost, non-isolated, Zero voltage switching (ZVS), Zero current switching (ZCS)I. INTRODUCTION The bidirectional DC to DC converters are most popularly used to transfer from high voltage to low voltage and vice-versa. These converters are extensively used in many industrial applications such as uninterrupted power supply systems, hybrid electric vehicles, auxiliary supplies and battery banks for storing of energy etc. A variable inductor based bidirectional converter increases the saturation level and reduces its magnetic core size [1] of power inductor, because of variable inductor under the dynamic load variations leads to increasing the additional losses. However, the overall efficiency may reduce. A bidirectional DC-DC converter [2] implemented with the parallel connection of IGBT and MOSFETs were used to reduce conduction losses and improved the voltage gain. A loosely coupled inductor (LCI) based high power density interleaved boost converter [3] obtained improved efficiency and reduced power losses, respectively. However, the converter is cost-effective due to the SiC (silicon carbide) switching devices are used. A dual half bridge DC-DC converter [4][5][6] are obtained zero voltage switching to the semiconductor devices with the aid of leakage inductances of their high frequency transformer and snubber capacitors with the MOSFETs. They achieved a poorer efficiency, due to high switching frequency operated at higher output power levels. To choose an efficient DC-DC converters, a vast comparison of various converters is presented in [7], which are used to interface fuel cells in electric vehicles. The isolated soft switching converter achieves ZVS and ZCS with low efficiency by operating the circuit in discontinuous conduction mode (DCM) [8]. A non-isolated interleaved boost converter [9-10] achieved high gain and ZVS with the aid of coupled inductors and active clamping circuits, respectively. Furthermore, it has higher efficiency at low power and lower efficiency at high power. A cascaded buck-boost inductor in middle and cascaded buckboost capacitor in middle converters [10] are comparing their efficiency at 10kW and achieved efficiency is 92%.This article presents the comparative simul...

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Section: Simulation Results and Comparative Analysismentioning

confidence: 99%

Section: B Buck Mode Operationmentioning

confidence: 99%

mentioning

confidence: 99%

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Comparative Simulation Analysis on High Gain Bidirectional and High Step-up DCDC Converters

Thumma¹,

Bhajana²

2017

IJET

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“…In addition, the conduction loss of rectifier diodes is also reduced. The authors of [17] use a parallel-series connection to achieve a very high step-up ratio (up to 650) as well as high voltage operation (~2-kV). In [18,19], the authors use parallel-series connections to improve performance by reducing the turns of primary windings, decreasing the loss of coils, and reducing cross-regulation problems.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Three-Phase LLC Resonant Converter with Matrix Transformers

et al. 2022

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This study presents the topology of a three-phase LLC resonant converter with matrix transformers. The three-phase LLC resonant converter has the advantages of conventional LLC resonant converters, including zero-voltage switching at the primary side, zero-current switching at the secondary side, high-frequency feasibility, and high efficiency. Moreover, it has additional advantages that differ from conventional LLC, including low output capacitor current ripple, natural current sharing in three resonant currents, and a high power level. As a result of the above mentioned characteristics, LLC topology has been used in many electric vehicle charging systems, server power systems, and other high-power applications. However, as the power level becomes higher and higher, the input voltage is usually too high to reduce conduction loss, and the output current also increases. This situation makes transformer design more difficult. The increasing current means more core and copper loss, and the heat dissipation of the transformer becomes more difficult. Matrix transformer technology can improve this problem directly and simply. By utilizing matrix transformers, which are primary series connected and secondary parallel connected, the primary voltage stress and secondary current stress of the transformers can be reduced, and the output current can be distributed. The analysis of the proposed converter in this study includes a circuit operation introduction, a time-domain analysis, calculation of the transfer ratio curve in the frequency domain, and a loss analysis. The theoretical analysis and performance of the proposed converter are verified. A three-phase LLC resonant converter with matrix transformers prototype is built with a high input voltage of 800-VDC and high output current of 200-A. The output voltage is 100-VDC. The waveform and efficiency data will be shown in the experimental results.

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A parallel-series connected four-transformer half bridge DC-DC converter for electric vehicle application

Cited by 2 publications

References 8 publications

Comparative Simulation Analysis on High Gain Bidirectional and High Step-up DCDC Converters

Comparative Simulation Analysis on High Gain Bidirectional and High Step-up DCDC Converters

Analysis and Design of Three-Phase LLC Resonant Converter with Matrix Transformers

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