Dr. He Xiangning

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23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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18 May 2020 in Nature Communications

Journal Article

Nature of power electronics and integration of power conversion with communication for talkative power

Power electronics and communication electronics are both based on electromagnetic theory, but they are usually regarded as two distinct subfields in electrical engineering. In fact, however, electric power is the most common matter-based carrier of messages; thus, power electronics and communications can be jointly considered. Here we study the essential nature of dc-dc power converters and characterize the similarity of their operation principle to that of communication systems. Based on this similarity and the double modulation methods used in power electronics and communication, a double modulation strategy for both power and data is presented and applied in dc-dc power converters to achieve what we call ‘talkative power’. A modulation strategy called frequency hopping-differential phase shift keying (FH-DPSK) is also presented to overcome the crosstalk between chosen transmission systems. The proposed talkative power strategy sheds new light on and provides inspiration for the further development of power electronics and communication.

29 June 2017 in Sustainability

Journal Article

Overview of Current Microgrid Policies, Incentives and Barriers in the European Union, United States and China

Continuously increasing demand of microgrids with high penetration of distributed energy generators, mainly renewable energy sources, is modifying the traditional structure of the electric distribution grid. Major power consumer countries are looking for alternative energy sources to avoid the impact of higher fossil fuel consumption. Thus, different policies have been promulgated to promote renewable energy technologies (RETs) and distributed energy resource (DER) deployment and are encouraging technological innovation. These policies aim to reduce greenhouse gas (GHG) emissions and achieve energy security and independence to meet an ever-increasing electricity demand. Many studies have been performed on the successful integration of RET and DER operation and control, protection and stability issues, all simultaneously and satisfactorily implemented during feasible microgrid operation. However, apart from the technical challenges, few microgrid studies exist on effective policies and incentives for microgrid promotion and deployment. This survey investigates the policy, regulatory and financial (economical and commercial) barriers, which hinder the deployment of microgrids in the European Union (EU), United States (USA) and China. In this paper, a clear view on microgrid policy instruments and challenges are investigated to aid future developments.

21 February 2019 in IEEE Journal of Emerging and Selected Topics in Power Electronics

Journal Article

Hybrid Modulation of Parallel-Series $LLC$ Resonant Converter and Phase Shift Full-Bridge Converter for a Dual-Output DC–DC Converter

Jin Xia

Yousheng Wang

A novel pulse frequency and phase shift hybrid modulated dual-output dc-dc converter is proposed in this paper. The proposed converter is composed of hybrid modulation of an input-parallel-output-series LLC resonant converter and a phase shift full bridge (PSFB) converter. The output voltage of the LLC resonant converter is modulated by the switching frequency, whereas the output voltage of the PSFB converter is modulated by the phase angle; therefore, the two output voltages are regulated independently and free from cross regulation. The series inductor of the PSFB converter does not need to be specially designed to help achieving the soft switching operation, and the duty cycle loss could be mitigated. Zero-voltage switching can be achieved on the power switches in the whole load range. Finally, a 1.2-kW 400-input 200-400-V and 48-V output prototype is built and tested to verify the effectiveness of the proposed converter.

31 July 2019 in IEEE Transactions on Power Electronics

Journal Article

High Off-State Impedance Gate Driver of SiC MOSFETs for Crosstalk Voltage Elimination Considering Common-Source Inductance

Chushan Li

The crosstalk voltage on the gate source terminal of SiC power MOSFETs in a phase leg circuit is composed of the gate-drain capacitor introduced voltage and the common source inductor introduced voltage. The mathematical model of the crosstalk voltage indicates that to suppress two types of crosstalk voltage, there exists a contradictory requirement on the off-state gate loop impedance. This challenge reduces the effectiveness of conventional crosstalk elimination methods. As an improvement, a crosstalk voltage suppression circuit that synchronously eliminates the crosstalk voltage of gate-drain capacitance and the common source inductance is proposed. In this work, instead of creating low impedance gate loop in the off state, a high impedance gate loop is formatted to eliminate the voltage drop on the common source inductance. Meanwhile the potential false turn-on or the negative voltage spikes caused by gate-drain capacitance is eliminated by the pre-charge voltage in the gate source capacitor. The required pre-stored charge is analyzed considering the nonlinear behavior of the junction capacitance of the SiC MOSFETs. The proposed gate driver is experimentally verified in different switching conditions.

4 April 2019 in IEEE Transactions on Power Electronics

Journal Article

Full-Duplex High-Speed Simultaneous Communication Technology for Wireless EV Charging

This letter presents a novel simultaneous wireless power and data transmission (SWPDT) system for wireless EV charging. The data carrier is injected and extracted by a plugand- play toroidal-core inductor. Two data carriers of 5 MHz and 6.25 MHz are adopted to achieve bidirectional and full-duplex communication using frequency division multiplexing. Differential quadrature phase-shift keying modulation is achieved by a Class-E amplifier in the data transmitter. An analog switch circuit is designed to demodulate the data carrier in the data receiver. The proposed method is verified by a prototype that achieves up to 64 kbps full-duplex data transmission under 3.3 kW power transfer. The bit rate and interference immunity of data transmission are greatly improved compared to the reported SWPDT systems, which makes it possible to realize high speed simultaneous communication in the kilowatt-level wireless EV charging.

6 July 2020 in IEEE Transactions on Power Electronics

Journal Article

Medium Voltage Soft-Switching DC/DC Converter With Series-Connected SiC MOSFETs

Nowadays, due to the growing demands of data centers, the traditional line frequency transformer based data center power distribution system is becoming bulky and inefficient. Although SST based DC-PDS dramatically improves the system efficiency, the traditional multi-cell SST with input-series output-parallel (ISOP) architectures has limitations. Using high voltage devices to develop single-cell SST improves system performance, however, its application is limited by high voltage power devices. As an alternative solution, achieving high blocking voltage through the series connection of low voltage devices brings several advantages. Nevertheless, the series connection brings about voltage imbalance and switching loss increment problems. This paper proposes a medium voltage series resonant converter with series-connected SiC MOSFETs. By adding snubber capacitors to each SiC MOSFET and working at LLC resonant soft-switching mode, the voltage imbalance is reduced and switching loss is decreased. Then the analytical model of MVSRC is established. Moreover, the voltage imbalance model is established and the voltage imbalance sensitivity is defined to guide the snubber parameter selections. Afterward a design example of the 99% efficient 5kV/400V prototype is presented. Lastly, the experimental results verify the validity of proposed methods and the accuracy of analysis.

About Me

Xiangning He received B.Sc. and M.Sc. degrees from Nanjing University of Aeronautical and Astronautical, Nanjing, China, in 1982 and 1985, respectively, and a Ph.D. degree from Zhejiang University, Hangzhou, China, in 1989. From 1985 to 1986, he was an Assistant Engineer at the 608 Institute of Aeronautical Industrial General Company, Zhuzhou, China. From 1989 to 1991, he was a Lecturer at Zhejiang University. In 1991, he obtained a Fellowship from the Royal Society of U.K., and conducted research in the Department of Computing and Electrical Engineering, Heriot-Watt University, Edinburgh, U.K., as a Post-Doctoral Research Fellow for two years. In 1994, he joined Zhejiang University as an Associate Professor. Since 1996, he has been a Full Professor in the College of Electrical Engineering, Zhejiang University. He was the Director of the Power Electronics Research Institute, the Head of the Department of Applied Electronics, the Vice Dean of the College of Electrical Engineering, and he is currently the Director of the National Specialty Laboratory for Power Electronics, Zhejiang University. His research interests are power electronics and their industrial applications. Dr. He is a Fellow of The Institute of Electrical and Electronics Engineers (IEEE) and was appointed as IEEE Distinguished Lecturer by the IEEE Power Electronics Society in 2011. He is also a Fellow of the Institution of Engineering and Technology (formerly IEE), U.K.

Dr. He Xiangning

Dr. He Xiangning

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