An improved wide input voltage buck-boost + LLC cascaded converter

An improved buck-boost + LLC (IBB LLC) cascaded converter appropriate for wide input voltage situation is presented in this paper, which can be used as a constant voltage source or a constant current source charger for battery. The control strategy of dual frequency PWM (DFPWM) is introduced. For the LLC converter, ZVS for MOSFETs and ZCS for diode are achieved. As a result, the switching loss is reduced and the converter can operate at higher switching frequency with high efficiency. The operation principle and characteristics of the presented converter are verified on a 200V-450V input 14V/80A output experimental prototype.

[1]  Haoyu Wang,et al.  Maximum Efficiency Point Tracking Technique for $LLC$-Based PEV Chargers Through Variable DC Link Control , 2014, IEEE Transactions on Industrial Electronics.

[2]  G.A. Rincon-Mora,et al.  A low voltage, dynamic, noninverting, synchronous buck-boost converter for portable applications , 2004, IEEE Transactions on Power Electronics.

[3]  Yan-Fei Liu,et al.  A Zero-Crossing Noise Filter for Driving Synchronous Rectifiers of LLC Resonant Converter , 2014, IEEE Transactions on Power Electronics.

[4]  Gang Yang,et al.  Double-Phase High-Efficiency, Wide Load Range High- Voltage/Low-Voltage LLC DC/DC Converter for Electric/Hybrid Vehicles , 2015, IEEE Transactions on Power Electronics.

[5]  Yan Liang,et al.  Optimal design methodology for LLC resonant converter , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[6]  Ruan Xin-bo.  Hybrid Full Bridge Three-level LLC Resonant Converter , 2006 .

[7]  F. Lee,et al.  LLC resonant converter for front end DC/DC conversion , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[8]  Haoyu Wang,et al.  Design and Analysis of a Full-Bridge LLC-Based PEV Charger Optimized for Wide Battery Voltage Range , 2014, IEEE Transactions on Vehicular Technology.

[9]  M. Orabi,et al.  High frequency QSW-ZVS integrated buck converter utilizing an air-core inductor , 2012, 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  Johann W. Kolar,et al.  Ultraflat Interleaved Triangular Current Mode (TCM) Single-Phase PFC Rectifier , 2014, IEEE Transactions on Power Electronics.

[11]  Hyun-Lark Do.  Nonisolated Bidirectional Zero-Voltage-Switching DC–DC Converter , 2011, IEEE Transactions on Power Electronics.

[12]  Ali Emadi,et al.  Digital Combination of Buck and Boost Converters to Control a Positive Buck–Boost Converter and Improve the Output Transients , 2009 .

[13]  Xinbo Ruan,et al.  Dual-edge modulated four-switch Buck-Boost converter , 2008, 2008 IEEE Power Electronics Specialists Conference.

[14]  F. Canales,et al.  A wide input voltage and load output variations fixed-frequency ZVS DC/DC LLC resonant converter for high-power applications , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[15]  Gun-Woo Moon,et al.  LLC Resonant Converter With Adaptive Link-Voltage Variation for a High-Power-Density Adapter , 2010, IEEE Transactions on Power Electronics.

[16]  Jun-Young Lee,et al.  An Isolated DC/DC Converter Using High-Frequency Unregulated $LLC$ Resonant Converter for Fuel Cell Applications , 2011, IEEE Transactions on Industrial Electronics.

[17]  Young-Joo Lee,et al.  A Compensation Technique for Smooth Transitions in a Noninverting Buck–Boost Converter , 2009, IEEE Transactions on Power Electronics.