Dr Jonathan Davidson

PhD, MEng

Department of Electronic and Electrical Engineering

Senior Lecturer

Electrical Machines and Drives Research Group

Headshot of Jonathan Davidson
Profile

I joined the department in 2006 and studied both my MEng and PhD here, graduating in 2010 and 2015 respectively.

After a brief time as a postdoctoral researcher, I was appointed as a lecturer in the Electrical Machines and Drives group in 2015. I was made Senior Lecturer in 2022.

In both my research and teaching, I address interdisciplinary problems and themes and work with other academics from departments across the faculty.

My main research focus is on power electronics and covers two distinct but overlapping topics: electrical power conversion, and impedance sensing and system modelling. My power conversion research covers primarily resonant converters using both traditional magnetic resonant tanks and piezoelectric transformers (Grant: FPeT £600k, 2017) and lately high frequency supplies for chemical species selective reactions (Grant: Targeted waveform plasma reactor £980k, 2019). Notable successes in the field include the development of a design criterion for efficient piezoelectric transformers and a thorough exploration of the geometry requirements for transformers.

I have applied impedance sensing and system modelling to several areas. In the converters scene, it has driven the evaluation of piezoelectric transformer design and it is an enabling technology for the chemical species selection. In addition, it is the primary enabler of work on sewage sensing (Grants: Hydro Intl £200k, 2019; NBIC £50k 2020) which focusses on early detection of sediment build-up, examining the chemistry during destructive testing of electrochemical cells and producing accurate dynamic thermal models of power electronics.

My teaching focus has been on electrical engineering for interdisciplinary engineers. I was originally appointed as the electrical engineering lead to design a new programme in general engineering; I continue to lecture students in their first and second years on electrical engineering and interdisciplinary design. In 2021, I was appointed Deputy Director of Aerospace Engineering where my focus is on the design and operation of the avionics curriculum.

My teaching uses a combination of traditional visualiser note-making, pre-prepared videos, role-play group work and laboratory projects to provide students with an experience of all that engineering has to offer. I also offer final year projects to general, aerospace and electrical engineering students.

Qualifications
  • PhD (Electronic and Electrical Engineering), University of Sheffield, 2015
  • MEng (Electronic Engineering), University of Sheffield 2010
Research interests
  • Power electronic converters and drives
  • Piezoelectric transformer-based power supplies
  • Electrical sensing of water systems
  • Thermal modelling and temperature estimation
  • Pseudorandom binary sequences for system identification
  • Electrochemical battery modelling
Publications

Journal articles

Conference proceedings papers

  • Forrester J, Li L, Yang Z, Davidson J, Foster M, Stone D, Reaney I & Sinclair D (2022) Performance Of Pzt-based Piezoelectric Transformers For Use In High-temperature Converters. Power Electronics, Machines and Drives (PEMD) 2022 RIS download Bibtex download
  • Wang Y, Davidson J & Foster M (2022) Cyclic-mode Modelling Of Class EF/2 inverters Featuring a Piezoelectric Resonator As The Auxiliary Network. Power Electronics, Machines and Drives (PEMD) 2022 RIS download Bibtex download
  • Arab Ansari S, Davidson J & Foster M (2022) Fully-integrated Transformer With Asymmetric Leakage Inductances for a Bidirectional Resonant Converter. Power Electronics, Machines and Drives (PEMD) 2022 RIS download Bibtex download
  • O'Keeffe H, Foster M & Davidson J (2022) Parameterisation Methods For Piezoelecric Transformer Equivalent Circuit Models. Power Electronics, Machines and Drives (PEMD) 2022 RIS download Bibtex download
  • Yang Z, Forrester J, Davidson J & Foster M (2022) Resonant Current Estimation And Voltage Regulation For Piezoelectric Transformer-based Power Supply. Power Electronics, Machines and Drives (PEMD) 2022 RIS download Bibtex download
  • Forrester J, Davidson J, Foster M & Stone D (2021) RadPTDesigner: A program for designing radial mode piezoelectric transformers for inductorless inverters. 2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe RIS download Bibtex download
  • Ansari SA, Davidson JN, Foster MP & Stone DA (2021) Design and Analysis of a Fully-integrated Planar Transformer for LCLC Resonant Converters. 2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe RIS download Bibtex download
  • Arab Ansari S, Davidson J & Foster M (2020) Comparative evaluation of Si MOSFET-based soft switching DC-DC converters and GaN HEMT-based hard switching DC-DC converters. IET Power Electronics Machines and Drives Conference, 15 December 2020 - 17 December 2020. RIS download Bibtex download
  • Yang Z, Foster M & Davidson J (2020) Output voltage regulation for piezoelectric transformer-based resonant power supplies using phaselocked loop control. IET Power Electronics Machines and Drives Conference, 15 December 2020 - 17 December 2020. RIS download Bibtex download
  • Wang Z, Davidson J & Foster M (2020) A large-scale battery energy storage system simulation tool for studying cell variation. IET Power Electronics Machines and Drives Conference, 15 December 2020 - 17 December 2020. RIS download Bibtex download
  • Ansari SA, Davidson JN & Foster MP (2020) Analysis, design and modelling of two fully- integrated transformers with segmental magnetic shunt for LLC resonant converters. IECON 2020 : The 46th Annual Conference of the IEEE Industrial Electronics Society (pp 1273-1278). Singapore, 18 October 2020 - 21 October 2020. RIS download Bibtex download
  • Bugryniec P, Davidson J & Brown S (2020) Computational modelling of thermal runaway propagation potential in lithium iron phosphate battery packs. Energy Reports, Vol. 6(Supplement 5) (pp 189-197). Southampton, UK, 9 July 2019 - 10 July 2019. View this article in WRRO RIS download Bibtex download
  • Kankanamalage RR, Foster MP & Davidson JN (2019) Online electrolytic capacitor prognosis system for PWM drives. 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), 3 September 2019 - 5 September 2019. View this article in WRRO RIS download Bibtex download
  • Forrester J, Davidson J, Foster M & Stone D (2019) Equivalent Circuit Parameter Extraction Methods for Piezoelectric Transformers. 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), 3 September 2019 - 5 September 2019. View this article in WRRO RIS download Bibtex download
  • Bugryniec PJ, Davidson JN & Brown SF (2018) Assessment of thermal runaway in commercial lithium iron phosphate cells due to overheating in an oven test. Energy Procedia, Vol. 151 (pp 74-78), 11 September 2018 - 12 September 2018. View this article in WRRO RIS download Bibtex download
  • Hewitt DA, Green JE, Davidson JN, Foster MP, Stone DA & Foreman MRS (2016) Observations on Changes to Electrolytic Capacitor Electrical Properties Caused by Gamma Irradiation. IWIS 2016, 26 September 2016 - 28 September 2016. View this article in WRRO RIS download Bibtex download
  • Davidson JN, Foster MP & Stone DA (2016) Thermal Analysis Using 2-Dimensional Impedance Spectroscopy and Pseudorandom Binary Sequences. IWIS 2016 RIS download Bibtex download
  • Hewitt DA, Green JE, Davidson JN, Foster MP & Stone DA (2016) Measurement of Electrical Parameters of Electrolytic Capacitors Using Real-World Drive Waveforms for State-of-Health Determination. IWIS 2016, 26 September 2016 - 28 September 2016. View this article in WRRO RIS download Bibtex download
  • Hewitt DA, Green JE, Davidson JN, Foster MP & Stone DA (2016) Electrolytic capacitor age estimation using PRBS-based Techniques. PCIM Europe 2016; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (pp 1095-1102) View this article in WRRO RIS download Bibtex download
  • Tsang C-W, Bingham C, Leach JM, Stone DA, Davidson JN & Foster MP (2016) Minimum charge-recovery time control with parallel connected buck converters. 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016) View this article in WRRO RIS download Bibtex download
  • Hewitt DA, Green JE, Davidson JN, Foster MP & Stone DA (2016) Observation of electrolytic capacitor ageing behaviour for the purpose of prognostics. IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, 23 October 2016 - 26 October 2016. View this article in WRRO RIS download Bibtex download
  • Davidson JN, Foster MP & Stone DA (2014) Real-time temperature monitoring and control for power electronic systems under variable active cooling by characterisation of device thermal transfer impedance. 7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014) RIS download Bibtex download
  • Davidson JN, Stone DA, Foster MP & Gould CR (2013) Prediction of device temperatures in an electric vehicle battery charger system by analysis of device thermal cross-coupling. 2013 15th European Conference on Power Electronics and Applications (EPE), 2 September 2013 - 6 September 2013. RIS download Bibtex download
  • Davidson J, Stone D & Foster M (2013) Mixed PRBS technique for thermal impedance spectroscopy of power electronic systems. PCIM Europe Conference Proceedings (pp 1047-1054) RIS download Bibtex download
  • Davidson JN, Stone DA & Foster MP (2012) Erratum for ‘Arbitrary waveform power controller for thermal measurements of semiconductor devices’. Electronics Letters, Vol. 48(11) (pp 665) RIS download Bibtex download
  • Forrester J, Davidson J & Foster M () Effect of spurious resonant modes on the operation of radial mode piezoelectric transformers. PCIM Europe 2018; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (pp 1740-1747). Nuremberg, Germany, 5 June 2018 - 7 June 2018. RIS download Bibtex download
Professional activities
  • Deputy Director, Aerospace Engineering
  • Electrical engineering theme liaison, General Engineering