scholarly journals New transformer‐less DC–DC converter topologies with reduced voltage stress on capacitors and increased voltage conversion ratio

2021 ◽  
Vol 14 (6) ◽  
pp. 1173-1192
Author(s):  
Maysam Abbasi ◽  
Ehsan Abbasi ◽  
Li Li
Keyword(s):  
Conversion Ratio ◽  
Voltage Stress ◽  
Converter Topologies ◽  
Voltage Conversion

scholarly journals A non‐isolated DC‐DC converter with low voltage stress and high step‐down voltage conversion ratio

2021 ◽  
Author(s):  
Stylianos P. Syrigos ◽  
Georgios C. Christidis ◽  
Theodoros P. Mouselinos ◽  
Emmanuel C. Tatakis
Keyword(s):  
Low Voltage ◽  
Conversion Ratio ◽  
Voltage Stress ◽  
Step Down ◽  
Voltage Conversion

scholarly journals A dual-switch cubic SEPIC converter with extra high voltage gain

2021 ◽  
Vol 12 (1) ◽  
pp. 199
Author(s):  
Christophe Raoul Fotso Mbobda ◽  
Alain Moise Dikandé
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
Magnetic Coupling ◽  
Conversion Ratio ◽  
Duty Ratio ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Extra High Voltage ◽  
Voltage Conversion

To provide a high votage conversion ratio, conventional non-isolated DC-DC boost topologies, which have reduced voltage boost capability, have to operate with extremely high duty cycle ratio, higher than 0.9. This paper proposes a DC-DC converter which is mainly based on the narrow range of duty cycle ratio to achieve extra high voltage conversion gain at relatively reduced voltage stress on semiconductors. In addition, it does include any magnetic coupling structure. The structure of the proposed converter combines the new hybrid SEPIC converter and voltage multiplier cells. From the steady-state analysis, this converter has wide conversion ratio and cubic dependence with respect to the duty ratio and then, can increase the output voltage several times more than the conventional and quadratic converters at the same duty cycle ratio. However, the proposed dual-switch cubic SEPIC converter must withstand higher voltage stress on output switches. To overcome this drawback, an extension of the proposed converter is also introduced and discussed. The superiority of the proposed converter is mainly based on its cubic dependence on the duty cycle ratio that allows it to achieve extra high voltage gain at reduced voltage stress on semiconductors. Simulation results are shown and they corroborate the feasibility, practicality and validity of the concepts of the proposed converter.

scholarly journals Noncascading Quadratic Buck-Boost Converter for Photovoltaic Applications

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 984
Author(s):  
Rodrigo Loera-Palomo ◽  
Jorge A. Morales-Saldaña ◽  
Michel Rivero ◽  
Carlos Álvarez-Macías ◽  
Cesar A. Hernández-Jacobo
Keyword(s):  
Boost Converter ◽  
Conversion Ratio ◽  
Operating Conditions ◽  
Duty Ratio ◽  
Switching Converters ◽  
Switching Converter ◽  
Photovoltaic Applications ◽  
Converter Topologies ◽  
Voltage Conversion ◽  
Different Sources

The development of switching converters to perform with the power processing of photovoltaic (PV) applications has been a topic receiving growing interest in recent years. This work presents a nonisolated buck-boost converter with a quadratic voltage conversion gain based on the I–IIA noncascading structure. The converter has a reduced component count and it is formed by a pair of L–C networks and two active switches, which are operated synchronously to achieve a wide conversion ratio and a quadratic dependence with the duty ratio. Additionally, the analysis using different sources and loads demonstrates the differences in the behavior of the converter, as well as the pertinence of including PV devices (current sources) into the analysis of new switching converter topologies for PV applications. In this work, the voltage conversion ratio, steady-state operating conditions and semiconductor stresses of the proposed converter are discussed in the context of PV applications. The operation of the converter in a PV scenario is verified by experimental results.

scholarly journals Improvement in Voltage Conversion Ratio of Ultrahigh Step-Down Converter

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3896
Author(s):  
Kuo-Ing Hwu ◽  
Wen-Zhuang Jiang ◽  
Hsiang-Hao Tu
Keyword(s):  
Input Voltage ◽  
Conversion Ratio ◽  
Leakage Inductance ◽  
Zero Voltage Switching ◽  
Voltage Stress ◽  
Basic Operating ◽  
Step Down ◽  
Voltage Conversion ◽  
Zero Voltage ◽  
Switch Voltage

A modified step-down converter is presented herein, which is mainly based on one coupled inductor and several energy-transferring capacitors to improve the voltage conversion ratio as well as to reduce the switch voltage stress. In addition, the portion of the leakage inductance energy can be recycled to the input via the active clamp circuit during the turn-off period and the switches have zero-voltage switching (ZVS) during the turn-on transient. In this paper, the basic operating principles of the proposed converter are firstly described and analyzed, and its effectiveness is finally demonstrated by experiment based on a prototype with input voltage of 60 V, output voltage of 3.3 V and rated output power of 33 W.

scholarly journals Design and Simulation of High-Efficiency High Gain non Isolated Interleaved DC-DC Converter with Reduced Voltage Stress on the Devices

2020 ◽  
Vol 9 (12) ◽  
pp. 312-317
Keyword(s):  
High Efficiency ◽  
High Gain ◽  
Conversion Ratio ◽  
Voltage Gain ◽  
Steady State Analysis ◽  
Voltage Stress ◽  
Voltage Conversion ◽  
State Resistance ◽  
Conduction Mode ◽  
Interleaving Technique

In this paper, a non-isolated two interleaved modified step up KY Converter is analyzed and designed, whose efficiency, the voltage conversion ratio is high. There are various types of non -isolated converters such as buck-boost, Cuk, SEPIC, ZETA converters, etc but the voltage gain of these converters is less compare to the proposed interleaved KY converters. The voltage gain, efficiency of the proposed converter is enhanced compared to the previous converters. The voltage stress on semi-conductor devices and the ripple in the input current is reduced because of this interleaving technique. Switches with low on-state resistance are used due to which the conduction losses are reduced. Steady-state analysis and the operating principle are studied in continuous conduction mode (CCM) at ideal conditions. Simulation is also carried out in MATLAB/Simulink for the proposed interleaved KY converter.

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