A New Family of Zero-Voltage-Transition Nonisolated Bidirectional Converters With Simple Auxiliary Circuit

Mohammadi, Mohammad Reza; Farzanehfard, Hosein

doi:10.1109/tie.2015.2498907

Cited by 79 publications

(37 citation statements)

References 33 publications

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“…Furthermore, in these converters, the switches operate under hard switching. The power losses of the nonisolated high voltage conversion ratio bidirectional converters are lower than the isolated converters . In Sedaghati et al, a dual active bridge dc‐dc converter is presented.…”

Section: Introductionmentioning

confidence: 99%

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A new non‐isolated free ripple input current bidirectional DC‐DC converter with capability of zero voltage switching

Saadatizadeh

Heris

Sabahi

et al. 2017

Circuit Theory & Apps

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Summary In this paper, a new nonisolated free ripple input current bidirectional dc‐dc converter with capability of zero voltage switching (ZVS) is proposed. The free ripple input current condition at low voltage side is achieved by using third winding of a coupled inductor and a capacitor for the whole range of duty cycles. In the proposed structure, the voltage conversion ratio can be more increased by adding the turn ratio of the second winding of the coupled inductor for the whole range of duty cycles. By adjusting the value of an auxiliary inductor in the topology of the converter, according to the power, the ZVS operation of the implemented 2 switches can be achieved throughout the whole power range. The mentioned features of proposed converter are validated theoretically for both boost and buck operations. In this paper, the proposed converter is analyzed for all operating modes. Moreover, all equations of the voltages and currents of all components, voltage conversion ratio, the required conditions for ZVS operation of switches, and also required conditions for canceling input current ripple at low voltage side are obtained. Finally, the performance of the proposed converter is reconfirmed through experimental and EMTDC/PSCAD simulation results.

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Section: Introductionmentioning

confidence: 99%

“…The power losses of the nonisolated high voltage conversion ratio bidirectional converters are lower than the isolated converters. [11][12][13][14] In Sedaghati et al, 15 a dual active bridge dc-dc converter is presented. The main advantages of this converter are bidirectional power flow and ZVS characteristics.…”

Section: Introductionmentioning

confidence: 99%

A new non‐isolated free ripple input current bidirectional DC‐DC converter with capability of zero voltage switching

Saadatizadeh

Heris

Sabahi

et al. 2017

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…By considering the diode reverse-recovery effect, analysis of zero-voltage transition bidirectional converter was done in order to improve its soft-switching range [14]. A new magnetically coupled bidirectional nonisolated dc-dc converters are proposed consisting of a simple additional circuit in order to obtain soft-transition operation in both power flow directions [15,16,19,21].…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of LCS resonant cell based enhanced zero-voltage transition DC-DC boosting converter

Nagarajan

Fusic²

2019

Serb J Electr Eng

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An enhanced zero-voltage transition boosting converter (EZVTBC) is introduced here which belongs to higher-order family. It exhibits lower source current and load voltage ripples and also it maintains better voltage gain with respect to traditional step-up converter. The zero-voltage transition is attained with an aid of a LCS resonant cell integrating L r  C r resonance tank network along with an extra switch. LCS resonant cell is the modified version of conventional ZVT switch cell and the salient feature of this cell is to eliminate peak current stress and conduction losses of main switch as this remains a predominant problem in hard-switched boost converter and it also improves efficiency. Initially, time domain expressions of EZVTBC are derived using Kirchhoff's laws for different operational stages to predict the resonant transition phenomenon. The simulation is progressed in PSIM software in order to verify its soft-switching performance on a 12-24 V, 30 W converter and also dynamic performance of the converter has been studied with line and load variations. It is found that for rated load conditions, efficiency of the soft-switched converter is improved 5 to 10% approximately and resulted in 97%. Moreover the peak current stress and conduction losses were eliminated.

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“…However, the current fed converter obtains the zero current turn-OFF for all the switches, by obtaining the soft switching the converter efficiency is increased. In addition to this, the author Md Reza Mohammadi [8] is explained the concept of a new family of ZVT buck-boost converter by adding a simple resonance cell to his proposed circuit. However, few researchers are focusing on soft-switching without adding additional auxiliary switches.…”

Section: Introductionmentioning

confidence: 99%

Soft-Switching High Gain Step-Up DC/DC Converter without Auxiliary Switches

2019

IJITEE

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This manuscript presents a novel high gain, high efficiency Soft-switching high step-up DC/DC converter for battery-operated vehicles. The high step-up converter can transfer the power flow from the small voltage to high voltage. The conventional two input inductor hard switched non-isolated DC-DC converter improved with an additional auxiliary cell to attain the Zero voltage switching, due to obtaining the softswitching the efficiency may improve and reduces the stress across the main switches. The isolated converters are used as a transformer to attain high gain, whereas in the proposed converter obtains the high gain without a transformer and contains the high efficiency in the step-up mode of operation. The main aim of the converter is to attain the Zero voltage switching without using any additional auxiliary switches. In this paper, the input voltage applied as 30V, and the obtained output voltage is fifteen times to the applied voltage, which is 450V and the output power 850W. This paper mainly presents the theoretical analysis of converter operation and the evaluation of the simulation results validated with the theoretical analysis.

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A New Family of Zero-Voltage-Transition Nonisolated Bidirectional Converters With Simple Auxiliary Circuit

Cited by 79 publications

References 33 publications

A new non‐isolated free ripple input current bidirectional DC‐DC converter with capability of zero voltage switching

A new non‐isolated free ripple input current bidirectional DC‐DC converter with capability of zero voltage switching

Analysis and design of LCS resonant cell based enhanced zero-voltage transition DC-DC boosting converter

Soft-Switching High Gain Step-Up DC/DC Converter without Auxiliary Switches

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