Non-Isolated High Step-up DC-DC Converter with a Coupled Inductor

2012 ◽  
Vol 424-425 ◽  
pp. 1024-1027 ◽  
Author(s):  
Hyun Lark Do
Keyword(s):  
High Efficiency ◽  
Semiconductor Devices ◽  
Soft Switching ◽  
Voltage Gain ◽  
Switching Loss ◽  
Switching Operation ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
And Performance

A non-isolated high step-up DC-DC converter with a coupled inductor is proposed in this paper. The proposed converter provides high voltage gain and soft-switching operation of all semiconductor devices. A voltage doubler and a coupled inductor increase the voltage gain. Zero-voltage-switching (ZVS) of all switches and zero-current-switching (ZCS) of all diodes are achieved. Also, the voltages across the semiconductor devices are effectively clamped. Due to the soft-switching operation of all switching devices, the switching loss is significantly reduced and the high efficiency is obtained. The feasibility and performance of the proposed converter were verified on an experimental prototype

Design of Resonant Soft-Switching Grid-Connected Inverter

2012 ◽  
Vol 263-266 ◽  
pp. 43-47
Author(s):  
Fang Yang ◽  
Zhao Hui Liu ◽  
Jian Wei Zhang
Keyword(s):  
Soft Switching ◽  
Switching Loss ◽  
Small Power ◽  
Zero Voltage Switching ◽  
Advantages And Disadvantages ◽  
Zero Current Switching ◽  
Zero Current ◽  
Grid Connected Inverter ◽  
Inverter Topology ◽  
Power Diode

This paper discusses the topology requirements of the small power photovoltaic grid-connected inverter,and introduces several typical topologies,moreover,points out the advantages and disadvantages,efficiency and applicable occasions of the various topologies. In this paper,a single-phase full-bridge grid-connected inverter topology(DC/AC) is designed. The soft-switching technology is employed on the topology for reducing switching loss. The topology can realizes zero voltage switching when the main switch turns on and turns off and zero current switching when auxiliary switch and the power diode turns on and turns off.The converter has higher efficiency than other topologies.

scholarly journals Operation of Current-fed Dual Active Bridge DC-DC Converters for Microgrid

2019 ◽  
Vol 8 (2) ◽  
pp. 3167-3175
Keyword(s):  
High Frequency ◽  
Soft Switching ◽  
Switching Loss ◽  
Zero Voltage Switching ◽  
Dual Active Bridge ◽  
Light Load ◽  
Zero Current Switching ◽  
Zero Current ◽  
Cell Energy ◽  
Load Conditions

Dual Active Bridge (DAB) is an isolated bidirectional DC-DC converter, which comprises two full bridge converterslinked through a high frequency transformer. It haslow stresses and permits high frequency performance because of the soft-switching. All the switches in the converter achieves the turn ON & OFF during Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) to minimize switching loss. Generally, DAB is classified as two types, namely, voltage-fed and current-fed variants. At light load conditions, soft-switching is not realized in case of voltage-fed DAB topologies. The application of current-fed DAB converters is to reduce the losses at the time of switching under light load conditions and improves the efficiency. This paper describes the various topologies of voltage-fed and current-fed DAB used for different applications in microgrid and fuel cell energy generation system by using the simulation. The performance of voltage-fed and current-fed DAB with snubber-less converters are also demonstrated and their effectiveness are validated

Soft-Switching Boost Half-Bridge Converter with High Voltage Gain and Low Input Current Ripple

2012 ◽  
Vol 424-425 ◽  
pp. 1093-1096
Author(s):  
Hyun Lark Do
Keyword(s):  
High Voltage ◽  
High Efficiency ◽  
Soft Switching ◽  
Input Current ◽  
Voltage Gain ◽  
Switching Loss ◽  
Switching Operation ◽  
Low Input ◽  
High Voltage Gain ◽  
Current Ripple

A soft-switching boost half-bridge converter with high voltage gain and low input current ripple is proposed in this paper. In the proposed converter, a coupled inductor is used at the boost converter stage to reduce the input current ripple. The half-bridge converter stage provides soft-switching operation and high voltage gain. Also, the reverse-recovery problem of output diodes is significantly alleviated by utilizing the leakage inductance of the transformer. Due to the soft-switching operation of all switching devices, the switching loss is significantly reduced and the high efficiency is obtained. The feasibility and performance of the proposed converter were verified on an experimental prototype

scholarly journals Ultracapacitors Utilization for Automotive Applications

10.14311/1153 ◽  
2010 ◽  
Vol 50 (1) ◽  
Author(s):  
Z. Pfof ◽  
P. Vaculík
Keyword(s):  
Fuel Cell ◽  
High Efficiency ◽  
Soft Switching ◽  
Drive Unit ◽  
Basic Principles ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Zero Voltage ◽  
Very High

This paper describes the basic properties of ultracapacitors and a converter for ultracapacitors with application zero-voltage switching (ZVS). Because of the very high efficiency of the ultracapacitor, the efficiency of the converter for ultracapacitors also has to be high; otherwise, the converter reduces efficiency of the whole drive unit. Further, the paper describes the drive unit concept for the CityEl electric vehicle, with the use of ultracapacitors in cooperation with a fuel cell. This co-operation with ultracapacitors is useful for the supply unit as a fuel cell, which cannot deliver peak power in dynamic conditions while maintaining its nominal efficiency. However, this poses no problems for ultracapacitors.There is also a description of the basic principles of soft switching using zero-voltage and zero-current switching together with a comparison of the power losses between hard and soft switching. 

scholarly journals Soft Switching of Full-Bridge DC-DC Buck Converter

2020 ◽  
pp. 561-565
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Distribution Systems ◽  
Buck Converter ◽  
Soft Switching ◽  
Power Supplies ◽  
Power Circuit ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current

The conventional Bidirectional Full-bridge dc -dc converter is inefficient and may not be practical for the low power applications. This paper specifies an efficient DC-DC Converter that avoids power losses by using soft switching techniques like Zero Voltage Switching and Zero Current switching. The soft switching of Bidirectional Full-bridge DC-DC Converter operates as a buck converter when the power is positive and as a boost converter when the power flow is negative. Applications of soft switching Bidirectional Full-bridge DC-DC Converter are uninterrupted power supplies (UPS), distribution Systems, battery charger circuits, telecom power supplies, computer power systems. Detailed analysis of the converter is carried out in buck mode to obtain relations between the power circuit parameters. Based on the analysis, control schemes are described to operate the converter. The proposed full bridge DC-DC converter is simulated in Buck mode using MATLAB /SIMULINK.

scholarly journals Resonant Hybrid Flyback, a New Topology for High Density Power Adaptors

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 363 ◽  
Author(s):  
Alfredo Medina-Garcia ◽  
Manfred Schlenk ◽  
Diego Morales ◽  
Noel Rodriguez
Keyword(s):  
Power Density ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Full Range ◽  
Input Voltage ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Class Power ◽  
World Class

In this article, an innovative power adaptor based on the asymmetrical pulse width modulation (PWM) flyback topology will be presented. Its benefits compared to other state-of-the-art topologies, such as the active clamp flyback, are analyzed in detail. It will also describe the control methods to achieve high efficiency and power density using zero-voltage switching (ZVS) and zero-current switching (ZCS) techniques over the full range of the input voltage and the output load, providing comprehensive guidelines for the practical design. Finally, we demonstrate the convenience of the proposed design methods with a 65 W adaptor prototype achieving a peak efficiency of close to 95% and a minimum efficiency of 93.4% at full load over the range of the input voltage, as well as a world-class power density of 22 W/inch3 cased.

scholarly journals A Novel Three-Phase Six-Switch PFC Rectifier with Zero-Voltage-Switching and Zero-Current-Switching Features

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1119 ◽  
Author(s):  
Chun-Wei Lin ◽  
Chang-Yi Peng ◽  
Huang-Jen Chiu
Keyword(s):  
Switching Loss ◽  
Modeling And Analysis ◽  
Zero Voltage Switching ◽  
Current Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Three Phase ◽  
The One ◽  
Zero Voltage ◽  
Voltage Switching

A novel three-phase power-factor-correction (PFC) rectifier with zero-voltage-switching (ZVS) in six main switches and zero-current-switching (ZCS) in the auxiliary switch is proposed, analyzed, and experimentally verified. The main feature of the proposed auxiliary circuit is used to reduce the switching loss when the six main switches are turned on and the one auxiliary switch is turned off. In this paper, a detailed operating analysis of the proposed circuit is given. Modeling and analysis are verified by experimental results based on a three-phase 7 kW rectifier. The soft-switched PFC rectifier shows an improvement in efficiency of 2.25% compared to its hard-switched counterpart at 220 V under full load.

scholarly journals An Interleaved DC/DC Converter with Soft-switching Characteristic and high Step-up Ratio

2020 ◽  
Vol 10 (6) ◽  
pp. 2167
Author(s):  
Yong-Nong Chang ◽  
Hung-Liang Cheng ◽  
Hau-Chen Yen ◽  
Chien-Hsuan Chang ◽  
Wei-Di Huang
Keyword(s):  
Conversion Efficiency ◽  
Operation Mode ◽  
Soft Switching ◽  
Switching Characteristic ◽  
Boost Converters ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Current Ripples ◽  
Zero Voltage

This study presents a dc/dc converter featuring soft-switching characteristic, high conversion efficiency, and high step-up ratio. The proposed circuit is composed of two parallel-connected boost converters. Only one coupled inductor is used to replace inductors of the boost converters which are interleaved operated at discontinuous-conduction mode (DCM). The current ripples at the input and the output terminals are reduced due to the interleaved operation. By freewheeling the current of the coupled inductor to discharge the stored electric charges in the parasitic capacitors of the active switches, both active switches can fulfill zero-voltage switching on (ZVS). Owing to DCM operation, the freewheeling diodes can fulfill zero-current switching off (ZCS). Therefore, the power conversion efficiency is improved. The operation principle for each operation mode is analyzed in detail and design equations for the component parameters are provided in this report. Finally, a prototype 200 W 48–400 V converter was implemented and measured to demonstrate the effectiveness of the proposed circuit.

scholarly journals A novel PV based high voltage gain soft switching DC-DC boost converter

2018 ◽  
Vol 7 (3) ◽  
pp. 1034
Author(s):  
Ingilala Jagadeesh ◽  
V Indragandhi
Keyword(s):  
High Voltage ◽  
Design Procedure ◽  
Boost Converter ◽  
Soft Switching ◽  
Oxide Semiconductor ◽  
Voltage Gain ◽  
Leakage Inductance ◽  
High Voltage Gain ◽  
Zero Current Switching ◽  
Zero Current

The design of high voltage gain DC-DC boost converter is carried out with the addition of the Voltage Multiplier (VM) method. Here the coupled inductor and VM methodologies are proposed to reduce the switching and conduction losses of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The Zero Current Switching (ZCS) technique with coupled inductor leakage inductance is used to operate the MOSFET. The leakage inductance is used to decrease the reverse recovery current across the diode. The design procedure of the boost converter and corresponding output waveforms are presented in this paper. Photovoltaic (PV) source converter with coupling inductors soft switching technique has been analyzed and tested in this paper.  

scholarly journals Analysis, Design and Experimental Validation of Modified Simple Soft Switching DC-DC Boost Converter

2015 ◽  
Vol 16 (4) ◽  
pp. 331-337 ◽  
Author(s):  
S. Raghavendran ◽  
B. Chitti Babu ◽  
Luigi Piegari
Keyword(s):  
Theoretical Analysis ◽  
Experimental Validation ◽  
Soft Switching ◽  
Zero Voltage Switching ◽  
Switching Losses ◽  
Zero Current Switching ◽  
Zero Current ◽  
Analysis Design ◽  
Zero Voltage ◽  
Voltage Switching

Abstract This paper investigates a modified simple soft switching dc-dc converter for low power applications. This simple topology uses an auxiliary switch, an inductor and a capacitor to operate the converter without switching losses. The efficiency of the converter is improved by transferring the energy that would be dissipated during the switching to the load. The main switch turns-on with zero current switching (ZCS) and turns-off with zero voltage switching (ZVS), while the auxiliary switch turns-on and turns-off with zero voltage switching (ZVS). The detailed theoretical analysis and the design equations are described. In addition to that, the analysis of proposed converter is demonstrated by both simulation and experimental results for effectiveness of the study.

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