Dr. Bing Ji

Bing photo UoL

PhD, MIET, SMIEEE, FHEA

Lecturer in Electrical Power Engineering

Location: E705, Engineering Tower, School of Engineering

Email: bing.ji(at)le.ac.uk
Tel: +44 (0)116 252 2314
Fax: +44 (0)116 223 1369

Personal details

I hold a PhD in Power Electronics and an MSc in Electric Power (distinction) from Newcastle University and a BEng in Electrical Engineering and Automation and BA in English (dual majors) from Dalian University of Technology, China.

Before joining the University of Leicester in June 2015 as a Lecturer in Electrical Power Engineering in School of Engineering, I was employed as a Research Associate in the School of Electrical and Electronic Engineering at Newcastle University (2013 - 2015). Before that, I was a Power Electronics Engineer at Hyperdrive Innovation Ltd (2012 - 2013).

Research Networks and Beacons

I'm a member of the Aerospace & Computational Engineering (ACE) research groupLeicester Institute for Space and Earth Observation (LISEO)Dalian Leicester Institute (DLI),  and Energy and Transport Theme.

Funds and Grants

  • 06/2018 Newton Fund, Researcher Links Workshop Grant, 'Digitization revolutionised intelligent power electronic system and electronic power grid', £37.8k, £20.8k allocated to Leicester, Leicester PI, submitted on 08/June/18
  • 05/2018 EPSRC Challenge Network in Automotive Power Electronics, £90k, £25k allocated to Leicester, Leicester PI, submitted on 03/May/18
  • 05/2018 Leicester CSE PGR Studentship, Sept 2018 – Mar 2022, £71k, PI
  • 03/2018 Leicester, International Research Development Fund, RED, £4.5k, PI
  • 04/2018 EPSRC feasibility study, ‘Multi-physics sensor fusion for power electronic converter prognostics,’ with universities of Nottingham, Sheffield, Liverpool and Queen Mary, £90k, 25% allocated to Leicester, Leicester PI
  • 12/2017 Leicester, International Seed Fund, CSE, £2k, PI
  • 04/2017 Leicester, Development Research Partnership Fund, CSE, £1.5k, PI
  • 01/2016 Leicester, Academic Research Career Development Fund, CSE, £10k, PI
  • 06/2015 Leicester, Early Career Start-up Fund, Dept of Engineering, CSE, £2.5k, PI
  • 2014-15 Innovate UK (TSB), ‘Direct state of health measurement for power devices’, £388k, CI Newcastle (20%)
  • 2014-17 Innovate UK KTP, Condition monitoring techniques dedicated for wind turbine drive-train and DC-link capacitor, £134k, Newcastle CI (20%)
  • 2012-15 FP7, Evaluation and development of wind turbine generator technologies, €393k, Newcastle CI (5%)
  • 2013 EPSRC, Through-life condition monitoring of electric drives and batteries in electric vehicles and plug-in hybrid electric vehicles, £25k, Support RA
  • 2012 Innovate UK (TSB), Amantys condition monitoring algorithm, TSB, £12.5k, Support RA

Awards

  • Student Union Superstar Award, University of Leicester, 2018
  • A recipient of College Well Done Card, CSE, University of Leicester, 2017
  • Santander Travel Awards, University of Leicester, 2016
  • IET Travel Award, The Institution of Engineering and Technology, 2014
  • “Innovator of the Year” Award, £5,000, “Intelligent gate drive design for high-reliability power electronic devices”, Newcastle University, 2013
  • Best Paper Award, the 9th International Symposium on Linear Drives for Industry Applications (LDIA’13), 2013
  • Henry Lester Trust Award, £2,500, “In-situ health monitoring of IGBT power modules in electric drives”, 2010

Media coverage

My research work on the 'control and design optimisation of Press-pack IGBTs' teamed up with China and UK institutes and China Southern State Power Grid Company was reported by IET Partner News Magazine, Page 21, issue 37 - Autumn 2018.

Invited speech at North China Electrical Power University by Weixin (for those who can read Chinese), Sep 2018

My research work to enable power electronics company to improve a condition monitoring system was reported by “TheJournal”, 2020 Vision - June 2014: www.thejournal.co.uk/2020vision

Professional activities

Editorial Board Member

  • Editor of IET Power Electronics, Mar 2018 ~ present
  • Editorial Coordinator of IET Power Electronics, May 2016 ~ Mar 2018
  • Associate Editor of IET Power Electronics, May 2014 ~ Apr 2016

Technical Programme Committee (TPC) Member

  • 12th European Conference on Silicon Carbide and Related Materials (ECSCRM), Sep 2-6, 2018, at Birmingham, UK
  • 29th European Symposium on Reliability of Electron Devices, Failure Physics and Analysis (ESREF), Sub-Track TPC Power Devices Reliability: Silicon and Passive, Oct 1 to 5, 2018, at Aalborg, Denmark
  • 10th International Conference on Integrated Power Electronics Systems (CIPS), Mar 20-22, 2018, at Stuttgart, Germany
  • IFEEC 2017-ECCE Asia, June 3-7, 2017, at Kaohsiung, Taiwan.
  • 9th International Conference on Integrated Power Electronics Systems (CIPS), Mar 8-10, 2016, at Nuremberg, Germany
  • I have also served as session chairs for ECSCRM 18, WiPDA-Asia18,  UPEC15.

Membership of Professional Bodies

  • SMIEEE – Senior Member of the Institute of Electrical and Electronics Engineers (Feb/2018)
  • MIET – Member of the Institution of Engineering and Technology (2012)
  • FHEA – Fellowship of the Higher Education Academy (June/2017)

Peer review of journal papers

  • IEEE Transactions on Power Electronics
  • IET Power Electronics
  • IEEE Transactions on Industrial Electronics
  • IEEE Transactions on Industry Applications
  • IEEE Transactions on Device and Materials Reliability
  • IET Renewable Power Generation

Research seminars and invited lectures

  • 2018: Invitation for “Silk Road International Spring Symposium for Distinguished Young Scholars”, Xian, China, Apr/2018
  • 2017: Invitation for “Intelligent Infrastructures for Sustainable and Resilient Future Energy Systems” workshop, Istanbul, Turkey, May/2017
  • 2016: IMB-CNM Microelectronics Research and Development Centre, Barcelona, Spain, April/2016
  • 2016: Wuhan University International Forum for Interdisciplinary Sciences and Engineering, Wuhan, China, April/2016
  • 2015: Daliang University of Technology, Dalian, China, March/2015
  • 2014: Center of Reliable Power Electronics (CORPE), Aalborg, Demark, Nov/2014
  • 2013: CNR Electric Traction R&D Center, Dalian, China, Aug/2013
  • 2013: Shenyang University of Technology, Shenyang, China, July/2013
  • 2013: Guangxi University, Naning, China, July/2013

Invited college seminar speakers

  • Prof Huai Wang, Professor, 'Reliable Power Electronics – an Enabler for Renewable Energy Generation and Utilization', Center of Reliable Power Electronics,  Aalborg University, Demark, 12/Mar/2018
  • Geoff Haynes, 'Now a production reality, Compound Semiconductors, SiC and GaN power switch transistors demand new circuit and system design approaches to achieve performance advantage', previously VP and co-founder of GaN System, Canada, 09/May/2018
  • Prof Krishna Shenai, Professor, 'Semiconductor Power Electronics Switch Reliability', University of Chicago, USA, 15/Feb/2019
  • Prof Lie Xu, Professor, ‘DC vs AC - Is DC the future for Electrical Power Network?’, University of Strathclyde, UK, 18/July/2019
  • Dr Richard Gibsons, Project Manager, Nidec Control Techniques, UK, TBC.

Teaching

  • 1st Year Electrical and Electronic Engineering (EG1201(DLI))
  • 2nd Year Engineering Design 2 (EG2005)
  • 3rd Year Electrical Power (EG3201)
  • 3rd Year Project (EG3005)
  • 4th Year Project (EG4002)
  • MSc Individual Project (EG7020)

Publications

For my latest publication, please refer to my Google Scholar Page .

A. Book chapters

[1] B. Ji, W.P. Cao, V. Pickert, (2016). “State-of-the-art intelligent gate drivers for IGBT power modules - monitoring, control and management at the heart of power converters”,  Chapter in 'Control Circuits in Power Electronics: Practical issues in design and implementation', (first ed., Chap. 11, pp. 307-335). Energy Engineering, IET. Editor Prof Miguel Castilla. Chap DOI: 10.1049/PBPO072E_ch

[2] B. Ji, K. Tan, H. Wu. (2018). “Advanced Gate Drive Approaches for Optimal Device-Level Control”. Chapter in ‘Control of Power Electronic Converters and Systems’, (Vol. 2, first ed., Chap. 28, pp. 453-475). Academic Press. Editor Prof Frede Blaabjerg. Chap DIO: doi.org/10.1016/B978-0-12-816136-4.00029-4

B. Journals or Transactions

[1] Z. Li, J. Wang, X. Yin, Y. Dai, B. Ji, Z. J. Shen, “Integrated Gate Driver for SiC/Si Hybrid Switch Enabling Multiple Optimization Objectives,” IEEE Transactions on Power Electronics, submitted, 2018

[2] R. Mandeya, C. Chen, V. Pickert, N. Ramasamy, B. Ji, “Gate-emitter Pre-threshold Voltage as a Health Sensitive Parameter for Chip Failure Monitoring in High Voltage Multichip IGBT Power Modules,” IEEE Transactions on Power Electronics, in press, 2018

[3] M. Ma, B. Ji, X. Zhang, “In-Situ Health Monitoring of Wire Bonding Faults in IGBT Modules of On-Line Three-Level Neutral-Point-Clamped Inverters,” IEEE Transactions on Power Electronics, submitted, 2018

[4] L. Chen, X Chen, Z. Wang, B. Ji, Z Lüa, H Wei, W Cao, H. Pan, “Sliding-Window Grey Model Based Remaining Useful Life Prediction of Lithium-Ion Batteries in the Particle Filtering Framework, ” IEEE Transactions on Power Electronics, submitted, 2018

[5] Y. Yerasimou, V. Pickert, X. Song, B. Ji, "Liquid Metal Magnetohydrodynamic Pump for Junction Temperature Control of Power Modules," IEEE Transactions on Power Electronics, in press, 2018, DOI: 10.1109/TPEL.2018.2806622

[6] L. Chen, Z. Lüa, Z. Wang, J. Lia, B. Ji, H. Pan, “A novel state-of-charge estimation method of Lithium-ion batteries combining the grey model and Genetic Algorithms,” IEEE Transactions on Power Electronics, in press, 2018, DOI: 10.1109/TPEL.2017.2782721

[7] X. Song, V. Pickert, B. Ji, R. Naayagi, C. Wang, Y. Yerasimou, "Questionnaire-Based Discussion of Finite Element Multiphysics Simulation Software in Power Electronics," IEEE Transactions on Power Electronics, vol. 33, no. 8, pp. 7010-7020, Aug. 2018.

[8] H. Wu, D. Giaouris, V. Pickert, B. Ji, “Nonlinear Analysis and Control of Interleaved Boost Converter using Real Time Cycle to Cycle Variable Slope Compensation,” IEEE Transactions on Power Electronics, vol. 32, no. 9, pp. 7256-7270, Sept. 2017.

[9] Y. Fu, N. Wang, Z. Wang, B. Ji, X. Wang "Smelting condition identification for a fused magnesium furnace based on an acoustic signal," Journal of Materials Processing Technology, 244, 231-239.

[10] Y. Hu, B. Ji, S. Finney, W. Xiao, and W. Cao, "High frequency inverter topologies integrated with the coupled inductor bridge arm," IET Power Electronics, vol. 9, pp. 1144-1152, 2016.

[11] Y. Hu, W. Cao, B. Ji, J. Si, and X. Chen, "New multi-stage DC–DC converters for grid-connected photovoltaic systems," Renewable Energy, vol. 74, pp. 247-254, 2015.

[12] B. Ji, X. Song, W. Cao, V. Pickert, Y. HU, J. Mackersie, et al., "In-Situ Diagnostics and Prognostics of Solder Fatigue in IGBT Modules for Electric Vehicle Drives," IEEE Transactions on Power Electronics, vol. 30, pp. 1535 - 1543, 2015.

[13] B. Ji, X. Song, E. Sciberras, W. Cao, Y. Hu, and V. Pickert, "Multi-Objective Design of IGBT Power Modules Considering Power Cycling and Thermal Cycling," IEEE Transactions on Power Electronics, vol.30, no.5, pp.2493-2504, May 2015.

[14] Y. Hu, W. Xiao, W. Cao, B. Ji, and D. J. Morrow, "Three-Port DC–DC Converter for Stand-Alone Photovoltaic Systems," IEEE Transactions on Power Electronics, vol. 30, pp. 3068-3076, 2015.

[15] L. Chen, B. Tian, W. Lin, B. Ji, J. Li, and H. Pan, "Analysis and prediction of the discharge characteristics of the lithium–ion battery based on the Grey system theory," IET Power Electronics, vol. 8, pp. 2361-2369, 2015.

[16] M. Ma, X. He, W. Cao, X. Song, and B. Ji, "Optimised phase disposition pulse-width modulation strategy for hybrid-clamped multilevel inverters using switching state sequences," IET Power Electronics, vol. 8, pp. 1095-1103, 2015.

[17] Z. Tan, X.-g. Song, B. Ji, Z. Liu, J.-e. Ma, and W.-p. Cao, "3D thermal analysis of a permanent magnet motor with cooling fans," Journal of Zhejiang University SCIENCE A, vol. 16, pp. 616-621, 2015.

[18] Y. Hu, W. Cao, J. Wu, B. Ji, and D. Holliday, "Thermography-based virtual MPPT scheme for improving PV energy efficiency under partial shading conditions," IEEE Transactions on Power Electronics, vol. 29, pp. 5667-5672, 2014.

[19] M. Zhang, D. J. Atkinson, B. Ji, M. Armstrong, and M. Ma, "A near-state three-dimensional space vector modulation for a three-phase four-leg voltage source inverter," IEEE Transactions on Power Electronics, vol. 29, pp. 5715-5726, 2014.

[20] Y. Hu, X. Song, W. Cao, and B. Ji, "New SR Drive With Integrated Charging Capacity for Plug-In Hybrid Electric Vehicles (PHEVs)," IEEE Transactions on Industrial Electronics, vol. 61, pp. 5722-5731, 2014.

[21] H. Chen, B. Ji, V. Pickert, and W. Cao, "Real-Time Temperature Estimation for Power MOSFETs Considering Thermal Aging Effects," IEEE Transactions on Device and Materials Reliability, vol. 14, pp. 220-228, 2014.

[22] X. Song, J. Zhang, S. Kang, M. Ma, B. Ji, W. Cao, et al., "Surrogate-based analysis and optimization for the design of heat sinks with jet impingement," IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 4, pp. 429-437, 2014.

[23] B. Ji, V. Pickert, W. Cao, and B. Zahawi, "In situ diagnostics and prognostics of wire bonding faults in IGBT modules for electric vehicle drives," IEEE Transactions on Power Electronics, vol. 28, pp. 5568-5577, 2013.

[24] B. Ji, H. Wu, W. Cao, V. Pickert, Y. Hu, “Overview of the Condition Monitoring Techniques for IGBT Modules in Photovoltaic Converters,” IET Power Electronics, to be submitted in June/2018

C. Conference Proceedings

[27] K. Tan, B. Ji, Z. Wang, “Evaluation of Active Current Source Gate Driver for IGBT Module Switching Transitions,” Intelligent Motion and Power Quality (PCIM), Asia, Shanghai, China, 26-28 June 2018

[28] K. Tan, T. Xie, Z. Wang, B. Ji and P. Lefley, "Investigation of optimal IGBT switching behaviours under advanced gate control," IFEEC 2017 - ECCE Asia, Kaohsiung, 2017, pp. 1771-1776.

[29] K. Tan, Y. Fu, Z. Wang, B. Ji, P. Lefley, “Circuit Simulation Studies of IGBT Switching Performance under Active Gate Control Strategies”, 2016 International Conference for Students on Applied Engineering (ICSAE), Newcastle, 20-21 October 2016.

[30] H Pan, J Li, W Lin, L Chen, Guangxi University, China, B Ji, “A method for state-of-charge estimation of Lithium-ion batteries based on an improving grey model using Sliding Mechanism and Genetic Algorithms”, Power Electronics, Machines and Drives (PEMD 2016), 8th IET International Conference on,  Glasgow, 19 – 21 April 2016,

[31] B. Ji, C. Wang, X. Song, V. Pickert, W. Cao, “IGBT condition monitoring with system identification methods,” the IEEE Transportation Electrification Conference and Expo (ITEC) Asia-Pacific, Beijing, Sept. 2014

[32] B. Ji, X. Song, H. Wu, V. Pickert, W. Cao, “Integrated condition monitoring for vehicle-ready power modules,” the IEEE Transportation Electrification Conference and Expo (ITEC) Asia-Pacific, Beijing, Aug. 2014

[33] Chen, L.; Ji, B.; Cao, W.P.; Pan, H.H.; Tian, B.B; Lin, W.L., "Grey system theory-based capacity estimation method for Li-ion batteries," Power Electronics, Machines and Drives (PEMD 2014), 7th IET International Conference on, 8-10 April 2014

[34] Ji, B.; Chen, L.; Cao, W.P.; Zhang, M.; Pickert, V., "Electro-thermal method for semiconductor power losses analysis under different modulation schemes," Power Electronics, Machines and Drives (PEMD 2014), 7th IET International Conference on , , 8-10 April 2014

[35] Ji, B.; Song, X.G.; Cao, W.P.; Pickert, V., "Active temperature control of Li-ion batteries in electric vehicles," Hybrid and Electric Vehicles Conference 2013 (HEVC 2013), IET, 6-7 Nov. 2013

[36] Ji, B.; Pickert, V.; Cao, W.P.; Xing, L., "Onboard condition monitoring of solder fatigue in IGBT power modules," Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), 2013 9th IEEE International Symposium on, pp.9-15, 27-30 Aug 2013.

[37] Z. Liu, W. Cao; Z Tan, X. Song, B. Ji, G. Tian, "Electromagnetic and temperature field analyses of winding short-circuits in DFIGs," Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), 2013 9th IEEE International Symposium on, pp.269,273, 27-30 Aug. 2013

[38] B Ji, V. Pickert, B. Zahawi, M. Zhang., "In-situ bond wire health monitoring circuit for IGBT power modules,"Power Electronics, Machines and Drives (PEMD 2012), 6th IET International Conference on, 27-29 March 2012

[39] B Ji; V. Pickert, B. Zahawi., "In-situ Bond Wire and Solder Layer Health Monitoring Circuit for IGBT Power Modules,"Integrated Power Electronics Systems (CIPS), 2012 7th International Conference on, 6-8 March 2012

[40] B Ji., V. Pickert, and B. Zahawi. "In-situ Measurement of the Bond Wire Lift-off in IGBT Power Modules."Intelligent Motion and Power Quality (PCIM), Europe, Nuremberg, Germany(2011).

[41] Z. Liu, W. Cao, Z. Tan, B. Ji, X. Song, G. Tian, “Condition monitoring of doubly-fed induction generators in wind farms”, the Ninth International Symposium on Linear Drives for Industry Applications (LDIA’13), July 2013

[42] Ambusaidi, K.; Pickert, V.; Zahawi, B.; Ji, B., "PSPICE analysis of PWM controlled inductorless fault tolerant multilevel dc/dc converters," Power Electronics, Machines and Drives, 2008. PEMD 2008. 4th IET Conference on , vol., no., pp.490,494, 2-4 April 2008.

[43] Ambusaidi K, Pickert V, Zahawi B, Ji, B., “Evaluation of Fault Tolerant Multilevel DC/DC Converters, Power Electronics,” PCIM, Nuremberg, 27-29 May, 2008.

Research interests:

Power electronics and power semiconductors including:

The early-stage research:

  • High power density converter design for vehicle, aircraft and space applications
  • Multi-domain modeling and Multi-objective optimisation simulation
  • Design for reliability and Robustness testing of components and systems
  • Integrated power electronics systems

The near-market research:

  • Online condition monitoring and Non-destructive testing of power converters
  • Design of digitalised gate drivers for power devices
  • Build and testing of wide band-gap power semiconductor-based converters
  • Characterisation, control, protection, thermal management and cooling for power devices
  • Design of power electronics converters (AC-DC,DC-AC,DC-DC,AC-AC)

Brief descriptions of current research projects:

Condition monitoring of power devices

In order to investigate the wire-bond related failures that are commonly observed for power devices, their degradation conditions are detected by IR imaging that allows an in-situ monitoring method to be experimentally validated.

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Solder is the most common method to connect different materials in a power device package. Their health is mostly affecting the device performance and safety. A scanning acoustic microscope is a non-intrusive method used to detect the internal defects or evolving degradations. Inspections are conducted after 800 and 1300 thermal cycles, respectively (Fig. 1).

fig1

Fig.1 SAM images

Design for Reliability of Power Devices

As the reliability test of power semiconductor devices can be time consuming and costly, finite element analysis (FEA) is widely accepted for their performance and failure mechanism studies. A 2-D symmetrical FE model of multi-layered IGBT module is developed (Fig.2) for thermos-mechanical analysis and the distribution of von-Mises stress and plastic strain after thermal cycling are studies (Fig.3)

fig3

Fig.2 FE modelling

fig3

Fig.3 Thermo-mechanical analysis

Digitalized Gate Driver

The Digitalized Active Gate Driver (DAGD) with a quasi-realtime control algorithm implemented in FPGA to optimize the switching process is under test on the Double Pulse Test rig  (Fig.4).

DPTDr. Bing Ji

Fig.4 DPT rig

Resiliency and Reliability Enhancement for Power Semiconductor Devices using condition monitoring and adaptive control (Fig. 5)

fig5

Fig.5 Experiment

Research Fellows/Visiting Scholars

Mr Chris Tan, Apr 18 - Sep 18

Dr H. X. Liu, Xi’an Microelectronics Technology Institute

Miss C. Li, Dalian University of Technology

Current PhD Students

Mr Chris Tan (1st supervisor): Intelligent IGBT Gate Drives for Power Electronic Converters

Mr Shuai Ding (1st supervisor): Press-Pack IGBT (PPI) in HVDC Applications

Mr Jixuan Wei (1st supervisor): Optimised Control for Hybrid SiC/Si Power Devices in Electric Vehicle Applications

Miss Hongfei Chen (1st supervisor): Resiliency and Reliability Enhancement for Power Semiconductor Devices

Mr Zekun Li (1st supervisor): Improving GaN FET Performance in Extreme Environments for Aerospace Applications

Our Team

Oct 2018

left to right: Chris, Dr Bhangaonka, Dr Ji, Chen, Fei, Shuai, Jixuan and Dr Liu

Supervision

I am looking for talented, self-motivated researchers to work on cutting-edge technologies related to power electronics and electrified transportation. Being a researcher, you are expected to make an original contribution to knowledge as well as developing new ideas and improving understanding through this creation of new knowledge. Applications for PhD here.

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