Analysis and implementation of dual-output LLC resonant converter

A dual-output LLC resonant converter for LCD-TV applications is presented in this paper. Based on the LLC resonant behavior, the power MOSFETs are turned on at zero voltage switching (ZVS) and secondary rectifier diodes are turned off at zero current switching (ZCS). In the proposed converter, the primary windings of two transformers are connected in series so that the primary currents of two transformers are equal. In the secondary side of transformers, two full-wave rectifiers with dual-output configuration are connected in parallel to share the load current and to reduce the current stresses of the secondary windings of transformers. The principle of operation, steady state analysis and design consideration of the proposed converter are provided in detail. Experimental results based on a laboratory prototype with 12 V/14 A and -12 V/14 A outputs with 92.7% efficiency for LCD-TV applications were provided to verify the effectiveness of the proposed converter.

[1]  T. Jin,et al.  Multiphase LLC Series Resonant Converter for Microprocessor Voltage Regulation , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[2]  Robert W. Erickson,et al.  Steady-state analysis and design of the parallel resonant converter , 1986, 1986 17th Annual IEEE Power Electronics Specialists Conference.

[3]  Zhengyu Lu,et al.  Three-level LLC series resonant DC/DC converter , 2005, IEEE Transactions on Power Electronics.

[4]  Sujit K. Biswas,et al.  Optimized design of a fully soft-switched boost-converter suitable for power factor correction , 2006 .

[5]  Xinbo Ruan,et al.  Hybrid Full-Bridge Three-Level LLC Resonant Converter- A Novel DC-DC Converter Suitable for Fuel Cell Power System , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[6]  Ka Wai Eric Cheng,et al.  Analysis and experimental verification of the linear correlation of the operation condition among the bifurcation points of current-mode-controlled buck-boost converter , 2005, Int. J. Circuit Theory Appl..

[7]  K. Schetters,et al.  Design of a 1-MHz LLC Resonant Converter Based on a DSP-Driven SOI Half-Bridge Power MOS Module , 2007, IEEE Transactions on Power Electronics.

[8]  C. Adragna,et al.  Design-oriented steady-state analysis of LLC resonant converters based on FHA , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[9]  E. J. Dede,et al.  Design considerations for three element L-LC resonant inverters for induction heating , 1999 .

[10]  R. Steigerwald,et al.  A comparison of half-bridge resonant converter topologies , 1987, 1987 IEEE Applied Power Electronics conference and Exposition.

[11]  Dehong Xu,et al.  LLC resonant converter for 48 V to 0.9 V VRM , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[12]  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).

[13]  Gaetano Palumbo,et al.  Efficiency model of boost dc–dc PWM converters , 2005, Int. J. Circuit Theory Appl..

[14]  Zhaoming Qian,et al.  A simple structure of LLC resonant DC-DC converter for multi-output applications , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[15]  V. Vorperian,et al.  A complete DC analysis of the series resonant converter , 1982, 1982 IEEE Power Electronics Specialists conference.

[16]  Ching-Ming Lai,et al.  Using Automatic Frequency Shifting Techniques for LLC-SRC Output Voltage Regulation , 2006, 2006 CES/IEEE 5th International Power Electronics and Motion Control Conference.

[17]  Mutsuo Nakaoka,et al.  New conceptual three-phase current-fed soft switching pulse width modulation converter with switched capacitor type resonant dc link , 1999 .

[18]  Fang Lin Luo,et al.  Analysis, simulation and verification of a bipolar current source power resonant inverter , 2004, Int. J. Circuit Theory Appl..

[19]  G. Uma,et al.  Design and implementation of CF-ZVS-QRC using analog resonant controller UC3861 , 2007 .

[20]  Robert L. Steigerwald.  A comparison of half-bridge resonant converter topologies , 1987 .

[21]  Zhaoming Qian,et al.  A Novel LLC Resonant Converter Topology: Voltage Stresses of All Components in Secondary Side Being Half of Output Voltage , 2006, 2006 CES/IEEE 5th International Power Electronics and Motion Control Conference.

[22]  H.-C. Choi,et al.  A new soft-switched PWM boost converter with a lossless auxiliary circuit , 2006 .

[23]  Olorunfemi Ojo,et al.  Performance prediction of third-order series resonant convertor , 1995 .

[24]  Fred C. Lee,et al.  Integrated magnetic for LLC resonant converter , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[25]  Masato Ogata,et al.  Graph‐theoretical approach to 2‐switch DC–DC converters , 2005, Int. J. Circuit Theory Appl..