## Queen's Power Group Publications - 2008 & Before

All | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 & Before

Journal Papers Conference Papers Patents

## Journal Papers

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[J28] Z. Zhang, W. Eberle, P. Lin, Y.F. Liu, P.C. Sen, "**A 1-MHz High-Efficiency 12-V Buck Voltage Regulator With a New Current-Source Gate Driver**", IEEE Transactions on Power Electronics, Vol. 23, No. 6, Nov. 2008, pp. 2817-2827.

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[J27] S. Ye, E. Meyer and Y.F. Liu, "**A Novel Two Phase Nonisolated Full Bridge With Shared Primary Switches**", IEEE Transactions on Power Electronics, Vol. 23, No. 5, Sept. 2008, pp. 2363-2376.

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[J26] E. Meyer, Z. Zhang and Y.F. Liu, "**An Optimal Control Method for Buck Converters Using a Practical Capacitor Charge Balance Technique**", IEEE Transactions on Power Electronics, Vol. 23, No. 4, July 2008, pp. 1802-1812.

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[J25] W. Eberle, P.C. Sen and Y.F. Liu, "**A New Resonant Gate Drive Circuit with Efficient Energy Recovery and Low Conduction Loss**", IEEE Transactions on Industrial Electronics, Vol. 55, No. 5, May 2008, pp. 2213-2221.

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[J24] Z. Yang, S. Ye, and Y.F. Liu, "**A New Dual Channel Resonant Gate Drive Circuit for Low Gate Drive Loss and Low Switching Loss**", IEEE Transactions on Power Electronics, Vol. 23, No. 3, May 2008, pp. 1574-1583.

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[J23] A. Elnady, A. Noureldin and Y.F. Liu, "**Power-Quality Improvement Using Wiener Filters Based On a Modular Compensating Strategy**", IEEE Transactions on Power Delivery, Vol. 23, No. 2, April 2008, pp. 841-849.

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[J22] W. Eberle, Z. Zhang, Y.F. Liu and P.C. Sen, "**A Current Source Gate Driver Achieving Switching Loss Savings and Gate Energy Recovery at 1-MHz**," IEEE Transactions on Power Electronics, Vol. 23, No. 2, Mar. 2008, pp. 678-691.

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[J21] Z. Zhang, W. Eberle, Y.F. Liu and P.C. Sen, "**Optimal Design of a Resonant Gate Driver for Buck Converter Based on a New Analytical Loss Model**," IEEE Transactions on Power Electronics, Vol. 23, No. 2, Mar. 2008, pp. 653-666.

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[J20] Y. Han and Y.F. Liu, "**A Practical Transformer Core Loss Measurement Scheme for High-Frequency Power Converter**", IEEE Transactions on Industrial Electronics, Vol. 55, No. 2, Feb. 2008, pp. 941-948.

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[J19] S. Ye, W. Eberle and Y.F. Liu, "**A Novel Non-Isolated Full Bridge Topology for VRM Applications**", IEEE Transactions on Power Electronics, Vol. 23, No. 1, Jan. 2008, pp. 427-437.

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[J18] A. Perry, G. Feng, Y.F. Liu and P.C. Sen, "**A Design Method for PI-Like Fuzzy Logic controllers for DC-DC Converter**", IEEE Transactions on Industrial Electronics, Vol. 54, No. 5, Oct. 2007, pp. 2688-2696.

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[J17] Y. Han, W. Eberle and Y.F. Liu, "**A Practical Copper Loss Measurement Method for the Planar Transformer in High-Frequency Switching Converters**", IEEE Transactions on Industrial Electronics, Vol. 54, No. 4, August 2007, pp. 2276-2287.

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[J16] G. Feng, E. Meyer, and Y.F. Liu, "**A New Digital Control Algorithm to Achieve Optimal Dynamic Performance in DC-to-DC Converters**", IEEE Transactions on Power Electronics, July 2007, Volume 22, Number 4, pp. 1489-1498.

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[J15] Z. Yang, S. Ye, and Y.F. Liu, "**A New Resonant Gate Drive Circuit for Synchronous Buck Converter**", IEEE Transactions on Power Electronics, July 2007, Volume 22, Number 4, pp. 1311-1320.

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[J14] W. Zhang, Y.F. Liu, and B. Wu, "**A New Duty Cycle Control Strategy for Power Factor Correction and FPGA Implementation**", IEEE Transactions on Power Electronics, Nov 2006, Volume 21, Number 6, pp. 1745-1753.

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[J13] W. Zhang, Y.F. Liu, and B. Wu, "**New Digital Control Method for Power Factor Correction**", IEEE Transactions on Industrial Electronics, June 2006, Volume 53, Number 3, pp. 987-990.

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[J12] W. Zhang, G. Feng, Y.F. Liu, and B. Wu, "**A Digital Power Factor Correction (PFC) Control Strategy Optimized for DSP**", IEEE Transactions on Power Electronics, Nov 2004, Volume 19, Number 6, pp. 1474-1486.

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[J11] G. Feng, Y.F. Liu and L. Huang, "**A New Robust Algorithm to Improve the Dynamic Performance on the Speed Control of Induction Motor Drive**", IEEE Transactions on Power Electronics, November 2004, Vol.19, No.6, pp. 1614-1627

.

[J10] S. Ye, W. Eberle and Y.F. Liu, "**A Novel EMI Filter Design Method for Switching Power Supplies**", IEEE Transactions on Power Electronics, Nov 2004, Volume 19, No. 6, pp. 1668-1678

..

[J9] Y. Xi, P. Jain, Y.F. Liu and R. Orr, "**A Self Core Reset and Zero Voltage Switching Forward Converter Topology**", IEEE Transactions on Power Electronics, Vol.15, No.6, November 2000, pp. 1192-1203

..

[J8] G. Moschopoulos, P. Jain, Y.F. Liu and G. Joos, "**A Zero-Voltage Switched PWM Boost Converter with an Energy Feedforward Auxiliary Circuit**", IEEE Transactions on Power Electronics, Vol. 14, No. 4, July 1999, pp. 653-662

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[J7] Y.F. Liu and P.C. Sen, "**New Class-E DC-DC Converter Topologies with Constant switching frequency**", IEEE Transactions on Industry Applications, Vol.32, No.4, July/August 1996, pp. 961-969

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[J6] Y.F. Liu and P.C. Sen, "**Large Signal Modeling of Hysteric Current-Programmed Converters**", IEEE Transactions on Power Electronics, Vol.11, No.3, May 1996, pp.423-430

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[J5] Y.F. Liu and P.C. Sen, "**Source Reactance Lossless Switch (SRLS) for Soft-Switching Converters with Constant Switching Frequency**", IEEE Transactions on Circuits and Systems, Vol.43, No.4, April 1996, pp. 301-312

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[J4] Y.F. Liu and P.C. Sen, "**A Novel Resonant Converter Topology for DC-to-DC Power Supply**", IEEE Transactions on Aerospace and Electronic Systems, Vol.31, No.4, October 1995, pp. 1301-1313

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[J3] Y.F. Liu and P.C. Sen, "**A Novel Method to Achieve Zero-Voltage Regulation in Buck Converter**", IEEE Transactions on Power Electronics, Vol.10, No.3, May 1995, pp. 292-301

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[J2] Y.F. Liu, P.C. Sen and S. Huang, "**Function Control - A Novel Strategy to Achieve Improved Performance of the DC-to-DC Switching Regulators**", IEEE Transactions on Industrial Electronics, Vol.42, No.2, April 1995, pp. 186-191

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[J1] Y.F. Liu and P.C. Sen, "**A General Unified Large-Signal Model for Current Programmed DC-to-DC Converters**", IEEE Transactions on Power Electronics, Vol.9, No.4, July 1994, pp. 414-424

## Conference Papers

[C65] E. Meyer, Z. Zhang and Y.F. Liu, "**Controlled Current Source Circuit (CCSC) for Reduction of Output Voltage Overshoot in Buck Converters**", IEEE Power Electronics Specialists Conference (PESC), Rhodes, Greece, June 2008, pp. 815-820.

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[C64] W. Eberle, Z. Zhang, Y.F. Liu and P.C. Sen, "**A Simple Switching Loss Model for High Switching Frequency Voltage Regulators with Current Source Gate Drive**," IEEE Power Electronics Specialists Conference (PESC), Rhodes, Greece, June 2008, pp. 3780-3786.

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[C63] Z. Zhang, W. Eberle, Y.F. Liu and P.C. Sen, "**A Novel Non-Isolated ZVS Asymmetrical Buck Converter for 12V VRs**," IEEE Power Electronics Specialists Conference (PESC), Island of Rhodes, Greece, June 2008, pp. 974-978.

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[C62] Z. Zhang,W. Eberle, Y.F. Liu and P.C. Sen, "**A New Hybrid Gate Drive Scheme for Buck Voltage Regulators**," IEEE Power Electronics Specialists Conference (PESC), Island of Rhodes, Greece, June 2008, pp. 2498-2504.

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[C61] E. Meyer and Y.F. Liu, "**A Practical Minimum Time Control Method for Buck Converters Based on Capacitor Charge Balance**", IEEE Applied Power Electronics (APEC), Austin, USA, February 2008, pp. 10-16.

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[C60] S. Ye, E. Meyer and Y.F. Liu, "**A Novel Non-Isolated Two-Phase Full Bridge Topology for VRM Applications**", IEEE Applied Power Electronics (APEC), Austin, USA, February 2008, pp. 24-30.

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[C59] S. Ye, E. Meyer and Y.F. Liu, "**A Novel Isolated Two-Phase Full Bridge Topology for VRM Applications**", IEEE Applied Power Electronics Conference (APEC), Austin, USA, February 2008, pp. 353-359.

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[C58] W. Eberle, Z. Zhang, Y.F. Liu and P.C. Sen, "**A Simple Switching Loss Model for High Switching Frequency DC-DC Converters**," IEEE Applied Power Electronics Conference (APEC), Austin, USA, February 2008, pp. 36-42.

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[C57] Z. Zhang, W. Eberle, Y.F. Liu and P.C. Sen, "**A New Current-Source Gate Driver for a Buck Voltage Regulator**," IEEE Applied Power Electronics Conference (APEC), Austin, USA, February 2008, pp. 1433-1439.

.

[C56] W. Eberle, Z. Zhang, Y.F. Liu, and P.C. Sen "**A High Efficiency Synchronous Buck VRM with Current Source Gate Driver**" IEEE Power Electronics Specialists Conference (PESC), 2007, Orlando, USA, pp. 21-27.

PESC presentation

.

[C55] E. Meyer and Y.F. Liu, "**A Quick Capacitor Charge Balance Control Method to Achieve Optimal Dynamic Response for Buck Converters**" IEEE Power Electronics Specialists Conference (PESC), 2007, Orlando, USA, pp. 1549-1555.

PESC presentation

.

[C54] Z. Zhang, W. Eberle, Z. Yang, Y.F. Liu and P.C. Sen, "**Optimal Design of Current Source Gate Driver for a Buck Voltage Regulator Based on a New Analytical Loss Model**" IEEE Power Electronics Specialists Conference (PESC), 2007, Orlando, USA, pp. 1556-1562.

PESC presentation

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[C53] A. Elnady, A. Noureldin and Y.F. Liu, "**Implementation of the Wiener Filter for Extracting Power Quality Disturbances**" IEEE Power Electronics Specialists Conference (PESC), 2007, Orlando, USA, pp. 1116-1120.

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[C52] E. Meyer, G. Feng and Y.F. Liu, "**Novel Digital Controller Improves Dynamic Response and Simplifies Design Process of Voltage Regulator Module**" IEEE Applied Power Electronics Conference (APEC), 2007, Anaheim, USA, pp. 1447-1453.

APEC poster

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[C51] S. Ye, W. Eberle and Y.F. Liu, " **A Novel Non-Isolated Full Bridge Topology for VRM Applications**," IEEE Applied Power Electronics Conference (APEC), 2007, Anaheim, USA, pp. 134-140.

APEC presentation

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[C50] W. Eberle, Y.F. Liu and P.C. Sen, "**A Resonant Gate Drive Circuit with Reduced MOSFET Switching and Gate Losses**", IEEE Industrial Electronics Society Conference (IECON), 2006, Paris, France, pp. 1745-1750

IECON presentation

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[C49] K.Xu, Y.F. Liu and P.C. Sen, " **A New Resonang Gate Drive Circuit Utilizing Leakage Inductance of Transformer**", IEEE Industrial Electronics Society Conference (IECON), 2006, Paris, France, pp. 1933-1937

IECON presentation

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[C48] G. Feng, E. Meyer and Y.F. Liu, "**High Performance Digital Control Algorithms For DC-DC Converters Based on the Principle of Capacitor Charge Balance**", IEEE Power Electronics Specialists Conference (PESC), 2006, Jeju, South Korea, pp. 1740-1746

PESC presentation

.

[C47] Z. Zhang, Z. Yang, S. Ye and Y.F. Liu, "**Topology and Analysis of a New Resonant Gate Driver**", IEEE Power Electronics Specialists Conference (PESC), 2006, Jeju, South Korea,pp. 1453-1459

PESC presentation

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[C46] W. Eberle, Y.F. Liu and P.C. Sen, "**A Simple Large Signal Model for Isolated DC-DC Converters**", IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Ottawa, Canada, May 2006, pp. 1267-1270

CCECE presentation

.

[C45] W. Eberle, P.C. Sen and Y.F. Liu, "**A Novel High Performance Resonant Gate Drive Circuit with Low Circulating Current**", IEEE Applied Power Electronics Conference (APEC), 2006, Dallas, USA,pp. 324-330

APEC presentation

.

[C44] Z. Yang, S. Ye and Y.F. Liu, "**A New Resonant Gate Drive Circuit for Synchronous Buck Converter**", IEEE Applied Power Electronics Conference (APEC), 2006, Dallas, USA, pp. 52-58

APEC presentation

.

[C43] Z. Yang, S. Ye and Y.F. Liu, "**A New Dual Channel Resonant Gate Drive Circuit for Synchronous Rectifiers**", IEEE Applied Power Electronics Conference (APEC), 2006, Dallas, USA, pp. 756-762

APEC presentation

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[C42] G. Feng, W. Eberle and Y.F. Liu, "**A Digital Control Algorithm for DC-DC Converters Under Input Voltage Changes**", IEEE Applied Power Electronics Conference (APEC), 2006, Dallas, USA, pp. 1430-1436

APEC poster

.

[C41] W. Eberle, P.C. Sen and Y.F. Liu, "**A New Resonant Gate Drive Circuit with Efficient Energy Recovery and Low Conduction Loss**", IEEE Industrial Electronics Society Conference (IECON), 2005, pp. 650-655

IECON presentation

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[C40] K. Xu, Y.F. Liu and P.C. Sen, " **A New Resonant Gate Drive Circuit with Centre-Tapped Transformer**", IEEE Industrial Electronics Society Conference (IECON), 2005, pp. 639-644

IECON presentation

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[C39] A. Perry, G. Feng, Y.F. Liu and P.C. Sen, "**A New Analysis and Design Method for Fuzzy Logic Controllers Used in Power Converters**", IEEE Industrial Electronics Society Conference (IECON), 2005, pp. 1006-1011

IECON presentation

.

[C38] Y.F. Liu and P.C. Sen, *Invited Paper*, "**Digital Control of Switching Power Converters**", International Conference on Control Applications (ICC), 2005, pp. 635-640

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[C37] Z. Yang, S. Ye and Y.F. Liu, "**A New Transformer-Based Non-Isolated topology Optimized for VRM Application**", IEEE Power Electronics Specialists Conference (PESC), 2005, pp. 447-453

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[C36] S. Ye, W. Eberle, Z. Yang and Y. F. Liu, " **A New Non-Isolated Full Bridge Topology for Low Voltage High Current VRM Applications**", IEEE Power Electronics Specialists Conference (PESC), 2005, pp. 389-395

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[C35] G. Feng, W. Eberle and Y. F. Liu, "**A New Digital Control Algorithm to Achieve Optimal Dynamic Performance in DC-to-DC Converters**", IEEE Power Electronics Specialists Conference (PESC), 2005, pp. 2744-2749

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[C34] W. Zhang, G. Feng, Y.F. Liu and B. Wu, "**A New Duty Cycle Parallel Control Method and FPGA Implementation for AC-DC Converters with Power Factor Correction (PFC)**", IEEE Applied Power Electronics Conference (APEC), 2005, pp. 805-810

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[C33] Z. Yang, S. Ye and Y.F. Liu, " **A Novel Non-Isolated Half Bridge DC-DC Converter**", IEEE Applied Power Electronics Conference (APEC), 2005, pp. 301-307

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[C32] Y.W. Lu and Y.F. Liu, "**A Large-Signal Dynamic Model for Single-Phase AC-DC Converter with Power Factor Correction**", IEEE Power Electronics Specialists Conference (PESC), 2004, pp. 1057-1063

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[C31] Y. Han and Y.F. Liu, "**New Measurement Methods to Characterize Transformer Core Loss and Copper Loss in High-Frequency Switching Mode Power Supply**", IEEE Power Electronics Specialists Conference (PESC), 2004, pp. 1695-1701

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[C30] W. Zhang, G. Feng, Y.F. Liu, and B. Wu, " **A Direct Duty Cycle Calculation Algorithm for Digital Power Factor Correction (PFC) Implementation**", IEEE Power Electronics Specialists Conference (PESC), 2004, pp. 2326-2332

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[C29] A. Perry, G. Feng, Y.F. Liu and P.C. Sen, "**A New Sliding Mode-Like Control Method for Buck Converter**", IEEE Power Electronics Specialists Conference (PESC), 2004, pp. 3688-3693

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[C28] A. Perry, G. Feng, Y.F. Liu and P.C. Sen, "**A New Design Method for PI-like Fuzzy Logic Controllers Applied to DC-to-DC Converter**", IEEE Power Electronics Specialists Conference (PESC), 2004, pp. 3751-3757

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[C27] G. Feng, W. Zhang and Y.F. Liu, " **A New Current Feedback Fuzzy Logic Controller with Extended State Observer for DC-to-DC Converters**", IEEE Applied Power Electronics Conference (APEC), 2004, pp. 1771-1777

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[C26] W. Zhang, G. Feng, Y.F. Liu and B. Wu, "**DSP Implementation of Predictive Control Strategy for Power Factor Correction (PFC)**", IEEE Applied Power Electronics Conference (APEC), 2004, pp. 67-73

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[C25] W. Eberle, Y. Han, Y.F. Liu and S. Ye, "**An Overall Study of the Asymmetrical Half-Bridge with Unbalanced Turns and Current Mode Control**", IEEE Applied Power Electronics Conference (APEC), 2004, pp. 1083-1089

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[C24] Y.W. Lu, G. Feng and Y.F. Liu, " **A Large Signal Dynamic Model for DC-to-DC Converters with Average Current Control**", IEEE Applied Power Electronics Conference (APEC), 2004, pp. 797-803

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[C23] W. Zhang, G. Feng, Y.F. Liu and B. Wu, "**Analysis and Implementation of a New PFC Digital Control Method**", IEEE Power Electronics Specialists Conference (PESC), 2003, pp. 335-340

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[C22] S. Ye and Y.F. Liu, "**EMI Filter Design Method for Communication Power Sub-System**", IEEE Applied Power Electronics Conference (APEC), 2003, 2003, pp. 483-489

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[C21] G. Feng, W. Zhang and Y.F. Liu, " **An Adaptive Current Mode Fuzzy Logic Controller for DC-to-DC Converters**", IEEE Applied Power Electronics Conference (APEC) 2003, pp. 983-989

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[C20] W. Zhang, G. Feng, Y.F. Liu and B. Wu, "**A New Predictive Control Strategy for Power Factor Correction**", IEEE Applied Power Electronics Conference (APEC), 2003, pp. 403-409

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[C19] G. Feng, W. Zhang and Y.F. Liu, "**A New Adaptive Fuzzy Logic Control Method for DC-to-DC Converter**", IEEE Industrial Electronics Society Conference (IECON), 2002, pp. 1208-1213

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[C18] W. Zhang, G. Feng, Y.F. Liu and Bin Wu, " **A New Power Factor Correction (PFC) Control Method Suitable for Low Cost DSP**", IEEE International Telecommunications Energy Conference (INTELEC), 2002, pp. 407-414

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[C17] W. Eberle and Y.F. Liu, "**A Zero Voltage Switching Asymmetrical Half-Bridge DC/DC Converter With Unbalanced Secondary Windings For Improved Bandwidth**", IEEE Power Electronics Specialists Conference (PESC), 2002, pp. 1829-1834

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[C16] G. Feng, Y.F. Liu and L. Huang, "**A New Robust Controller to Improve the Dynamic Performance of Induction Motors**", IEEE Power Electronics Specialists Conference (PESC), 2001, pp. 778 -783

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[C15] G. Feng and Y.F. Liu, " **An Improved Nonlinear Control Strategy for Induction Motor Drive**", IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2001, pp. 7-12

.

[C14] Y. Zhang, P.C. Sen and Y.F. Liu, "**A Novel Zero Voltage Switched (ZVS) Buck Converter Using Coupled Inductor**", IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2001, pp. 357-362

.

[C13] Y.F. Liu and P. Jain, "**A New Current Sensing Scheme for Zero-Voltage Switching Phase-Shift Bridge Converter**", IEEE International Telecommunications Energy Conference (INTELEC), 2000, pp. 567-573

.

[C12] Y. Xi, P. Jain and Y.F. Liu, " **A Precisely Regulated Multiple Output Forward Converter Topology**", IEEE Applied Power Electronics Conference (APEC), 2000, pp. 986-992

.

[C11] Y. Xi, P. Jain, Y.F. Liu and R. Orr, "**A Zero Voltage Switching and Self-Reset Forward Converter Topology**", IEEE Applied Power Electronics Conference (APEC), 1999, pp. 827-833

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[C10] S. Mangat, Y. Xi, P. Jain and Y.F. Liu, "**A Modified Asymmetrical Pulse-Width-Modulated Resonant DC/DC Converter Topology**", IEEE Power Electronics Specialists Conference (PESC), 1998, pp. 662-668

.

[C9] Y. Xi, P. Jain, G. Joos and Y.F. Liu, " **An Improved Zero Voltage Switching Flyback Converter Topology**", IEEE Power Electronics Specialists Conference (PESC), 1998, pp. 923-929

.

[C8] G. Moschopoulos, P. Jain, G. Joos and Y.F. Liu, "**A Single Stage Vero Voltage Switched PWM Full-Bridge Converter with Power Factor Correction**", IEEE Applied Power Electronics Conference (APEC), 1997, pp. 457-463

.

[C7] G. Moschopoulos, P. Jain, G. Joos and Y.F. Liu, "**A Zero-Voltage Switched PWM Boost Converter with an Energy Feedforward Auxiliary Circuit**", IEEE Power Electronics Specialists Conference (PESC), 1996, pp. 76-82

.

[C6] Y.F. Liu and P.C. Sen, " **A Large Signal Model for Current-Programmed Boost Converter**", IEEE Industry Application Society Conference, 1994, pp. 1106-1112

.

[C5] Y.F. Liu and P.C. Sen, "**New Class-E DC-to-DC Converter Topologies with Constant Switching Frequency**", IEEE Industry Application Society Conference, 1993, pp. 1090-1097

.

[C4] Y.F. Liu and P.C. Sen, "**Source Reactance Lossless Switch (SRLS) for Soft Switching Converters with Constant Switching Frequency**", IEEE Industry Application Society Conference, 1992, pp. 710-719

.

[C3] Y.F. Liu, P.C. Sen and S. Huang, " **Function Control - A novel Strategy to Achieve Improved Performance of the DC-to-DC Switching Regulators**", IEEE Industry Application Society Conference, 1991, pp. 971-976

.

[C2] H. Qu, Y.F. Liu and S. Huang, "**Sliding-Mode Controlled Cuk Switching Regulator with Fast Response and First Order Dynamic Characteristic**", IEEE Power Electronics Specialists Conference (PESC), 1989, pp. 124-129

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[C1] Y.F. Liu and S. Huang, "**Function Control and its Application in DC-DC Switching Regulator**", IEEE Power Electronics Specialists Conference (PESC), 1988, pp. 377-383

.

## Patents

.

[P12] Y.F. Liu, K. Xu, **"Resonant Gate Drive Circuit with Centre-Tapped Transformer"** US Patent, patent number 7,453,292 B2, Nov. 18,2008

.

[P11] W. Zhang, Y.F. Liu, B. Wu**, "Parallel Current Mode Control Using a Direct Duty Cycle Algorithm with Low Computational Requirements to Perform Power Factor .Correction"**, US Patent, patent number 7,317,625 B2, Jan. 8, 2008

.

[P10] Y.F. Liu, S. Ye,**"Non-Isolated DC-DC Converters with Direct Primary to Load Current",** US Patent, patent number 7,307,857 B2, Dec. 11, 2007

.

[P9] Y.F. Liu, S. Ye,**"Non Isolated DC-DC Converters with Direct Primary To Load Current",** US Patent, patent number 7,110,265 B2, Sept. 19, 2006

.

[P8] Y.F. Liu, S. Ye, **"Isolated DC-DC Converters"**, US Patent, patent number 7,079,403 B2, Jul. 18, 2006

.

[P7] Y.F. Liu, R. Orr, K. Xu,**"Apparatus and Method of Controlling Low Frequency Load Currents Drawn From a DC Source in a Telecommunications Systems",** US Patent, patent number 6,980,783 B2, Dec. 27, 2005

.

[P6] R.F. Orr, Y.F. Liu, D.A Brown, R. Duvnjak,**"Signal and Power Transformers Coupling Arrangements"**, US Patent, patent number 6,911,746 B2, Jun. 28, 2005

.

[P5] R.F. Orr, Y.F. Liu, R.P Colbeck, D.A Brown, H.F Horwitz,**"Power Supply Controller",** US Patent, patent number 6,850,048 B2, Feb. 1, 2005

.

[P4] R.K. Orr, Y.F. Liu, **"DC Converters"**, US Patent, patent number 6,771,518 B2, Aug. 3, 2004

.

[P3] P.K. Jain, Y.F. Liu, **"Topology and Control Method for Power Factor Correction"**, US Patent, patent number 6,344, 986 B1, Feb. 5, 2002

.

[P2] P. Jain, Y.F. Liu, S. Mangat,**"Asymmetrical Pulse Width Modulated Resonant DC-DC Converter with Compensating Circuitry",** , US Patent, patent number 6,097,614, Aug. 1, 2000

.

[P1] P.K. Jain, Y.F. Liu, Y. Xi **"Flyback Converter with Soft Switching using Auxiliary Switch and Resonant Circuit**", US Patent, patent number 6,005,782, Dec. 21, 1999

.