[Paper]
    Journal paper
[J13] Y. P. Su, X. Liu, C. K. Lee and S. Y. R. Hui, "On the Relationship of Quality Factor and Hollow Winding Structure of Coreless Printed Spiral Winding (CPSW) Inductor", IEEE Transactions on Power Electronics (to be published)
[J12] W. X. Zhong, S. Y. R. Hui, W. C. Ho, and X. Liu, "Using Self-Driven AC-DC Synchronous Rectifier as a Direct Replacement for Traditional Power Diode Rectifier", IEEE Transactions on Industrial Electronics, Vol. 59, Issue 1, Jan. 2012, pp. 392-401
[J11] W. X. Zhong, X. Liu and S. Y. R. Hui , "A Novel Single-Layer Winding Array and Receiver Coil Structure for Contactless Battery Charging Systems with Free-Positioning and Localized Charging Features", IEEE Transactions on Industrial Electronics, Vol. 58, Issue 9, Sept. 2011, pp. 4136-4144
[J10] S.Y.R.Hui and Xun Liu, "Semiconductor transformers", IET Electronics Letters, Vol. 46, Issue 13, Jun 2010, pp 947-949.
[J09] Yipeng Su, Xun Liu and S.Y.R.Hui, "Mutual inductance calculation of movable planar coils on parallel surfaces", IEEE Transactions on Power Electronics, Vol. 24, Issue 4, Apr. 2009, pp. 1115-1124
[J08] Yipeng Su, Xun Liu and S.Y.R.Hui, "Extended theory on the inductance calculation of planar spiral windings including the effect of double-layer electromagnetic shield", IEEE Transactions on Power Electronics, Vol. 23, Issue 4, Jul. 2008, pp. 2052-2061
[J07] Xun Liu and S.Y.R.Hui, "Optimal design of a hybrid winding structure for planar contactless battery charging platform", IEEE Transactions on Power Electronics, Vol. 23, Issue 1, Jan. 2008, pp. 455-463 (2009 IEEE Power Electronics Society Transaction Prize Paper Award)
[J06] Xun Liu and S.Y.R.Hui, "Simulation study and experimental verification of a universal contactless battery charging platform with localized charging features", IEEE Transactions on Power Electronics, Vol. 22, Issue 6, Nov. 2007, pp. 2202-2210
[J05] Xun Liu and S.Y.R.Hui, "Equivalent circuit modeling of a multilayer planar winding array structure for use in a universal contactless battery charging platform". IEEE Transactions on Power Electronics, Vol. 22,  Issue 1,  Jan. 2007 pp. 21 - 29  
[J04] Xiaohua Jiang, Xun Liu, Xiaoguang Zhu, etc., "A 0.3 MJ SMES magnet of a voltage sag compensation system", IEEE Transactions on Applied Superconductivity ,Volume: 14, Issue: 2, June 2004: 717 - 720.   
[J03] Guiping Zhu, Zanji Wang, Xun Liu, etc., "Transient behavior research on the combined equipment of SMES-SFCL", IEEE Transactions on Applied Superconductivity, Volume: 14, Issue: 2, June 2004: 778 - 781  
[J02] Xun Liu, Xiaoguang Zhu, Xu Chu, etc., "Voltage sag compensation by SMES (基於超導儲能的瞬時電壓跌落補償) ", Automation of Electric Power Systems (電力系統自動化) , 2004, 28(3): 40-44 <in Chinese> 
[J01] Xun Liu, Xu Chu, Xiaohua Jiang, "Current source inverter (CSI) in SMES (超導儲能裝置中的電流源型逆變器)", Power Electronics (電力電子技術) , 2004, 38(4): 20-22 <in Chinese>

    Conference paper
[C15] W. X. Zhong, X. Liu and S. Y. R. Hui , "Analysis on a single-layer winding array structure for contactless battery charging systems with free-positioning and localized charging features", in IEEE ECCE 2010, pp. 658-665.
[C14] W. P. Choi, W. C. Ho, X. Liu and S. Y. R. Hui , "Comparative study on power conversion methods for wireless battery charging platform ", in 14 th International Power Electronics and Motion Control Conference (EPE/PEMC), pp.2251-2257, 2010.
[C13] Y. P. Su, X. Liu, C. K. Lee and S. Y. R. Hui, "Relationship of quality factor and hollow winding structure of Coreless Printed Spiral Winding (CPSW) inductor", in 25th IEEE Annual Applied Power Electronics Conference, APEC'10, pp.86-91, Feb. 2010, USA
[C12] W. X. Zhong, W. C. Ho, X. Liu and S. Y. R. Hui , "Self-driven AC-DC synchronous rectifier for power applications: A direct energy-efficient replacement for traditional diode rectifier ", in 25th IEEE Annual Applied Power Electronics Conference, APEC'10, pp.994-1001, Feb. 2010, USA
[C11] W. P. Choi, W. C. Ho, X. Liu and S. Y. R. Hui , "Bidirectional communication techniques for wireless battery charging systems & portable consumer electronics", in 25th IEEE Annual Applied Power Electronics Conference, APEC'10, pp.2251-2257, Feb. 2010, USA
[C10] Y. P. Su, X. Liu and S. Y. R. Hui, "Mutual inductance calculation of movable planar coils on parallel surfaces", in 39th IEEE Power Electronics Specialists Conference, PESC’08, pp.3475-3481, Jun. 2008, Greece
[C09] X. Liu, W. M. Ng, C. K. Lee and S. Y. R. Hui, "Optimal operation of contactless transformers with resonance at secondary circuit", in 23th IEEE Annual Applied Power Electronics Conference, APEC'08, pp. 645-650, Feb. 2008, USA
[C08] W. C. Ho, C. K. Lee, X. Liu, S. Y. R. Hui and Y. S. Lee, "A hybrid EMI filter with ultra-wide bandwidth", in 23th IEEE Annual Applied Power Electronics Conference, APEC'08, pp. 676-681, Feb. 2008, USA
[C07] X. Liu, C. K. Lee and S. Y. R. Hui, “An integrated planar EMI filter for ultrahigh frequency power converters”, in 38th IEEE Power Electronics Specialists Conference, PESC’07, pp. 1528-1534, Jun. 2007, USA.
[C06] Y. P. Su, X. Liu and S. Y. R. Hui, "Extended theory on the inductance calculation of planar spiral windings including the effect of double-layer electromagnetic shield", in 38th IEEE Power Electronics Specialists Conference, PESC'07, pp. 3022-3028, Jun. 2007, USA.
[C05] X. Liu and S. Y. R. Hui, "Optimal Design of a Hybrid Winding Structure for Planar Contactless Battery Charger Platform", in IEEE Industry Applications Society 41st Annual Meeting, IAS'06, vol. 5, pp. 2568 - 2575, Oct. 2006, USA.   
[C04] X. Liu and S. Y. R. Hui, "An analysis of a double-layer electromagnetic shield for a universal contactless battery charging platform", in 36th IEEE Power Electronics Specialists Conference, PESC'05, pp.1767-1772, Jun. 2005, Brazil
[C03] X. Liu, P. W. Chan and S. Y. R. Hui, "Finite element simulation of a universal contactless battery charging platform", in 20th IEEE Annual Applied Power Electronics Conference, APEC'05, pp. 1927-1932, Mar. 2005, USA  
[C02] X. Liu and S. Y. R. Hui, "Equivalent circuit modeling of a multilayer planar winding array structure for use in a universal contactless battery charging platform", in 20th IEEE Annual Applied Power Electronics Conference, APEC'05, pp.1366-1372, Mar. 2005, USA 
[C01] X. Liu, X. Zhu, X. Jiang, "A Phasor Control Scheme for Voltage Sag Compensation by SMES", in the 4th International Power Electronics and Motion Control Conference (IPEMC) , pp. 882-885, Aug. 2004, China

[Patent publications]
[H-01] X. Liu and W. P. Choi, "Universal demodulation and modulation for data communication in wireless power transfer", US patent filed: US12/558,955, Date of filing: 14-Sept-2009.

[G-04] W. C. Ho, S. Y. R. Hui, X. Liu and W. P. Choi, "Generalized AC-DC synchronous rectification techniques for single- and multi- phase systems", Chinese patent filed: CN200980132255.0, Date of filing: 19-Aug-2009.
[G-03] W. C. Ho, S. Y. R. Hui, X. Liu and W. P. Choi, "Generalized AC-DC synchronous rectification techniques for single- and multi- phase systems", European patent filed: EP 2321894A1 , Date of filing: 19-Aug-2009.
[G-02] W. C. Ho, S. Y. R. Hui, X. Liu and W. P. Choi, "Generalized AC-DC synchronous rectification techniques for single- and multi- phase systems", International patent filed: PCT/CN09/073355, Date of filing: 19-Aug-2009.
[G-01] W. C. Ho, S. Y. R. Hui, X. Liu and W. P. Choi, "Generalized AC-DC synchronous rectification techniques for single- and multi- phase systems", US patent filed: US 12/274,469, Date of filing: 20-Nov-2008.

[F-03] W. C. Ho, S. Y. R. Hui and X. Liu, "Single-phase self-driven full-bridge synchronous rectification", Chinesel patent filed: CN200980132098.3, Date of filing: 19-Aug-2009.
[F-02] W. C. Ho, S. Y. R. Hui and X. Liu, "Single-phase self-driven full-bridge synchronous rectification", International patent filed: PCT/CN09/073349, Date of filing: 19-Aug-2009.
[F-01] W. C. Ho, S. Y. R. Hui and X. Liu, "Single-phase self-driven full-bridge synchronous rectification", US patent filed: US12/194,921, Date of filing: 20-Aug-2008.

[E-03] X. Liu, "Inductively powered sleeve for mobile electronic device", Chinese patent filed: CN101630861A, Date of filing: 15-Jul-2009.
[E-02] X. Liu, "Inductively powered sleeve for mobile electronic device", European patent filed: EP09251752.3, Date of filing: 07-Jul-2009.
[E-01] X. Liu, "Inductively powered sleeve for mobile electronic device", US patent granted: US7,855,529, date of filing: 16-Jul-2008, date of patent: 21-Dec-2010.

[D-03] X. Liu, W. C. Ho, S. Y. R. Hui and W. C. Chan, "Localized charging, load identification and bi-directional communication methods for a planar inductive battery charging system", Chinese patent filed: CN 102007665A , Date of filing: 28-Oct-2008.
[D-02] X. Liu, W. C. Ho, S. Y. R. Hui and W. C. Chan, "Localized charging, load identification and bi-directional communication methods for a planar inductive battery charging system", International patent filed: PCT/CN08/072855, Date of filing: 28-Oct-2008.
[D-01] X. Liu, W. C. Ho, S. Y. R. Hui and W. C. Chan, "Localized charging, load identification and bi-directional communication methods for a planar inductive battery charging system", US patent granted: US7,915,858, Date of filing: 30-Oct-2007.

[C-04]  X. Liu, C. K. Lee and S. Y. R. Hui, “Planar EMI filter”, US patent filed: US12/325,390, Date of filing: 01-Dec-2008.
[C-03] S. Y. R. Hui, X. Liu, and C. K. Lee, “Planar EMI filter”, Chinese patent filed: CN101409137, Date of filing: 13-Jun-2008.
[C-02] S. Y. R. Hui, X. Liu and C. K. Lee, “Planar EMI filter”, European patent filed: EP08252033.9, Date of filing: 12-Jun-2008.
[C-01] S. Y. R. Hui, C. K. Lee and X. Liu, “Planar EMI filter”, US patent filed: US11/763,638, Date of filing: 15-Jun-2007.

[B-05] X. Liu and S. Y. R. Hui, "用於改善平面感應充電平臺性能的輔助線圈" ( “Auxiliary winding for improved performance of a planar inductive charging platform”), Chinese patent granted: ZL200680030162.3, Date of patent: 29-Jun-2011.
[B-04] X. Liu and S. Y. R. Hui, “Battery charging apparatus with planar inductive charging platform”, US patent granted: US8,040,103, Date of patent: 18-Oct-2011.
[B-03] X. Liu and S. Y. R. Hui, “Auxiliary winding for improved performance of a planar inductive charging platform”, European patent filed: EP06775418.4, Date of filing: 18-Aug-2006.
[B-02] X. Liu and S. Y. R. Hui, “Auxiliary winding for improved performance of a planar inductive charging platform”, International patent filed: PCT/CN2006/002100, Date of filing: 18-Aug-2006.
[B-01] X. Liu and S. Y. R. Hui, “Auxiliary winding for improved performance of a planar inductive charging platform”, UK patent filed: GB2434042A, Date of filing: 19-Aug-2005.

[A-01] X. Liu and X. Jiang, "電網市電電壓瞬時跌落的遠程監測方法及系統" ("Remote monitor method and system for instantaneous voltage dropping of electric power network"), Chinese patent granted: ZL02117630.2, Date of patent: 28-Jul-2004.
 

  Internet Publication
http://www.wirelesspowerconsortium.com/technology/reflected-impedance.html
http://www.wirelesspowerconsortium.com/technology/shielding-effectiveness.html