Soft-Switching DC–DC Converter for Distributed Energy Sources With High Step-Up Voltage Capability

This paper presents high step-up dc-to-dc converter for low voltage sources such as solar photovoltaics, fuel cells, and battery banks. To achieve high voltage gain without large duty cycle operation, combination of coupled inductor and switched capacitor voltage doubler cells are used. By incorporating active clamp circuit, voltage spike due to the leakage inductance of the coupled inductor is alleviated and zero-voltage switching turn on of the main and auxiliary switch is obtained. Due to the use of MOSFETs of low voltage rating and soft turn on of the switches, conduction loss and switching losses are reduced. This improves the efficiency and power density of the converter. The proposed converter can achieve high voltage gain with reduced voltage stress on MOSFET switches and output diodes. Design and analysis of the proposed converter is carried out, and finally, a 500-W experimental prototype is built to verify theoretical analysis.

[1]  Wuhua Li,et al.  Review of Nonisolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications , 2011, IEEE Transactions on Industrial Electronics.

[2]  A. Ioinovici,et al.  DC-to-DC converter with no magnetic elements and enhanced regulation , 1997, IEEE Transactions on Aerospace and Electronic Systems.

[3]  Fernando Lessa Tofoli,et al.  A Nonisolated DC–DC Boost Converter With High Voltage Gain and Balanced Output Voltage , 2014, IEEE Transactions on Industrial Electronics.

[4]  Fernando Lessa Tofoli,et al.  DC–DC Nonisolated Boost Converter Based on the Three-State Switching Cell and Voltage Multiplier Cells , 2013, IEEE Transactions on Industrial Electronics.

[5]  Yie-Tone Chen,et al.  DC–DC converter with high voltage gain and reduced switch stress , 2014 .

[6]  Robert W. Erickson,et al.  Fundamentals of Power Electronics , 2001 .

[7]  Fang Lin Luo,et al.  Positive output cascade boost converters , 2004 .

[8]  Bo Yang,et al.  Active clamp boost converter with switched capacitor and coupled inductor , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[9]  N. L. Narasamma,et al.  An Active Soft Switched Phase-Shifted Full-Bridge DC–DC Converter: Analysis, Modeling, Design, and Implementation , 2014, IEEE Transactions on Power Electronics.

[10]  A. Costabeber,et al.  High Step-Up Ratio Flyback Converter With Active Clamp and Voltage Multiplier , 2011, IEEE Transactions on Power Electronics.

[11]  Alexander Abramovitz,et al.  Derivation of a family of high step-up tapped inductor SEPIC converters , 2014 .

[12]  Narsa Reddy Tummuru,et al.  Multifunctional VSC Controlled Microgrid Using Instantaneous Symmetrical Components Theory , 2014, IEEE Transactions on Sustainable Energy.

[13]  Weidong Xiao,et al.  Dynamic Modeling and Control of Interleaved Flyback Module-Integrated Converter for PV Power Applications , 2014, IEEE Transactions on Industrial Electronics.

[14]  Adrian Ioinovici,et al.  Ultra-Large Gain Step-Up Switched-Capacitor DC-DC Converter With Coupled Inductor for Alternative Sources of Energy , 2012, IEEE Transactions on Circuits and Systems I: Regular Papers.

[15]  Wuhua Li,et al.  Single-Phase Improved Active Clamp Coupled-Inductor-Based Converter With Extended Voltage Doubler Cell , 2012, IEEE Transactions on Power Electronics.

[16]  G.R. Walker,et al.  Cascaded DC-DC converter connection of photovoltaic modules , 2004, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[17]  M. Vitelli,et al.  Power Electronics and Control Techniques for Maximum Energy Harvesting in Photovoltaic Systems , 2012 .

[18]  Esam H. Ismail,et al.  Ultra Step-Up DC–DC Converter With Reduced Switch Stress , 2010 .

[19]  Ali Ajami,et al.  A Novel High Step-up DC/DC Converter Based on Integrating Coupled Inductor and Switched-Capacitor Techniques for Renewable Energy Applications , 2015, IEEE Transactions on Power Electronics.

[20]  Adrian Ioinovici,et al.  Boost converter with high voltage gain using a switched capacitor circuit , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[21]  Ehsan Adib,et al.  Family of Soft-Switching Single-Switch PWM Converters With Lossless Passive Snubber , 2015, IEEE Transactions on Industrial Electronics.

[22]  Jiann-Fuh Chen,et al.  Novel High Step-Up DC–DC Converter for Distributed Generation System , 2013, IEEE Transactions on Industrial Electronics.

[23]  Fred C. Lee,et al.  Utilization of an active-clamp circuit to achieve soft switching in flyback converters , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[24]  Amardeep B. Shitole,et al.  Soft switched coupled inductor based high step up converter for distributed energy resources , 2014, IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society.

[25]  M. T. Aydemir,et al.  Z-source-based isolated high step-up converter , 2013 .

[26]  Yu Tang,et al.  Multicell Switched-Inductor/Switched-Capacitor Combined Active-Network Converters , 2015, IEEE Transactions on Power Electronics.

[27]  Adrian Ioinovici.  Power Electronics and Energy Conversion Systems, Fundamentals and Hard-switching Converters , 2013 .

[28]  M. R. Ramteke,et al.  Unity-Power-Factor Operation of Three-Phase AC–DC Soft Switched Converter Based On Boost Active Clamp Topology in Modular Approach , 2008, IEEE Transactions on Power Electronics.

[29]  Fred C. Lee,et al.  High-efficiency, high step-up DC-DC converters , 2003 .

[30]  F. Blaabjerg,et al.  Power electronics as efficient interface in dispersed power generation systems , 2004, IEEE Transactions on Power Electronics.

[31]  R. Gules,et al.  Voltage Multiplier Cells Applied to Non-Isolated DC–DC Converters , 2008, IEEE Transactions on Power Electronics.