People

Professor Gehan Amaratunga

Professor Amaratunga’s research is in the broad area of materials and technologies for electrical energy and power. It intersects electrical and electronic engineering with chemistry, physics, materials science and information systems.
An example would be a solar cell. Here the physics of optics, photonics and solid state electronics are realized in a material the properties of which are determined by its chemical elements, their bonding and long range order. The application however is as an optoelectronic battery ( cell), connected to other similar batteries ( panels) , which in turn are connected together to feed power into the electrical grid through ultra efficient DC-AC conversion/inversion using power electronics. Professor Amaratunga’s research spans the whole spectrum of areas from nanophotonics for enhancing light coupling into solar cells to solar electricity generation and its intelligent connection to the electrical power system to maximise benefit.
Electrochemical batteries and supercapacitors used as energy/power sources, another subject of interest, engender a similar spectrum of research areas.
Nanomaterials and nanotechnology in the context of solar cells and energy storage devices is a research focus.


Professor Florin Udrea

Professor Udrea’s first field of research is in the field of high voltage technologies and power devices There are several themes in this field, including:
vertical power devices such as Power MOSFETs, Superjunctions, Insulated Gate Bipolar Transistors(IGBTs), Gate Turn-off and Gate Commuted Thyristors
lateral power devices for Power and High Voltage ICs, including LDMOSFETs, Resurf and Superjunction devices and LIGBTs, SOI power devices
Wide bandgap materials and devices such as GaN High Electron Mobility Transistors (HEMTs), Silicon Carbide JFETs and MOSFETs and Diamond power devices
Professor Udrea’s second field of research is in the field of MEMS and microsensors. The most important aspects of his research are:
CMOS based gas sensors using micro-hotplates
Infra-red Emitters and detectors
CMOS temperature sensors
CMOS Flow Sensors


Dr Tim Coombs

Over the last 20 years, the Applied Superconductivity Research Group, which I am Director of, has built up an outstanding international reputation in several areas of superconductivity research, ranging from novel theoretical tools for the understanding of superconducting properties up to real breakthroughs in the design of cutting-edge technologies. The group is now one of the strongest groups in the world with an extensive portfolio of experimental techniques and mathematical analysis tools.
We are the world leaders in magnetisation of bulk superconductors using flux pumping techniques and I hold three ground breaking patents which cover both the flux pumping techniques and methods of patterning and arranging the magnets to enable high power density machines such as motors and generators (particularly wind turbines), as well as high-value machines such as accelerator magnets, MRI and MHD.
We have strong links with industry and have had collaborative projects sponsored by BMW, Rolls Royce, Areva, EDF Energy, VA Tech, Applied Superconductor, etc. Equally, we have many links with colleagues in other universities and are currently collaborating with Manchester on the development and use of MgB2. As well as UK universities, we have strong links with other European (Liege, Jena and Barcelona) and American (Los Alamos, Argonne, Boeing) groups. We participated in an exchange program with Tshinghua University sponsored by the Royal Society and regularly accept visitors from Europe and America.


Dr Patrick Palmer

My principal research is in the design, characterization and use of power semiconductor devices. My current research in this area focuses on the use of high voltage IGBTs connected in series, the characterization of IGBTs and the computer modeling and optimization of IGBTs and diodes. I also have an active interest in the computer simulation of multi-disciplinary systems, including power electronic circuits for hybrid electric cars, optimization of ship propulsion and captive power systems and fuel cells. An interest in energy saving in digital circuits resulted in the world’s fastest switch mode converter operating at 4GHz, fabricated in a 90nm silicon process.


Dr Tim Flack

The central theme of Dr Flack’s research interests is the development of finite element methods for the analysis of problems in electromagnetics. Current projects within this theme are:
Development of a generalised time-stepping eddy current solver for the analysis of the brushless doubly-fed generator for wind power applications. Modelling of electrical machines and electrical power systems integrated starter motor/alternators for mild hybrid electric vehicles. Development of an integrated modelling environment for electromagnetic gearboxes and electromagnetically-geared electrical machines. Development of finite-element code for micromagnetic simulations for application in magnetic computing. Integrated modeller for the simulation of combined circuit and electromagnetic problems for the development of high-efficiency power switched-mode power supplies.


Dr Ioannis Lestas

The research of Dr Lestas is associated with the analysis, modeling and control of large scale systems, using advanced methodologies in systems theory and optimization, while establishing connections with related domains such as distributed resource allocation and information theory. These methodologies are applied in problems associated with smart grids and power distribution networks, such as the problem of optimal power flow in power systems, dynamic pricing in electricity markets, and the development of generalized frameworks through which robust stability guarantees can be provided despite the complexity of these networks.
His research interests also expand in other areas where related analysis tools are important, such as power control in wireless networks, group coordination problems and the analysis of signaling and feedback mechanisms in gene regulatory networks.


Dr Teng Long

Dr Teng Long has been appointed Lecturer at the University of Cambridge in 2016. His research interests are Power Electronics technologies in electric power apparatus and systems to achieve high adaptability, controllability and reliability, including More Electric Vehicles (cars, trains, ships, aircraft), Electrical Energy Storage, Renewable Energy, Smart Grid.

Prior to joining Cambridge, Teng has worked for GE Power Conversion as a Power Electronics Engineer specialising power electronics, drives and power conversion system design and development. Teng has led or played an important role in many rewarding projects such as the first transformer-less all electric oil-platform supply vessel, the first large scale all electric warship (Type 45 Destroyer), the first electromagnetic aircraft catapult demonstrator, and the first large scale diesel/electric hybrid vessel (Tide-class tanker).

Teng received his BEng (Hons) from the University of Birmingham, BEng from the Huazhong University of Science and Technology (China) and PhD from the University of Cambridge. Teng is a Chartered Engineer (CEng). Teng is a Fellow of Peterhouse.