PhD Fellowships in Power Converter for LED Based Light, Aalborg University
Denmark. Three years PhD fellowships are available within a research project entitled with “ Power converter for LED based intelligent light sources”. This is a research in the general study programme Electrical and Electronic Engineering. The project will be undertaken at Department of Energy Technology, Faculties of Engineering, Science and Medicine.
Interested candidates are expected to hold a Masters degree in Electrical Engineering and should have a sound background in electronics, switch mode converters and control theory applied to power converters. Good analytical skills and a sharp interest in practical investigation are also required.
Successful candidate will be enrolled as a PhD student at the Doctoral School of the Faculty. The progress of the PhD student will be assessed every six months. It is a prerequisite for continuation of salary payment that the previous progress is approved at the time of the evaluation.
Project Description
As part of a large research effort of 4 Mill Euro to bring forward high-quality LED based intelligent lighting products that have significant benefits for end-users in terms of longer lifetime of the light sources, less power consumption and smaller physical volume this PhD stipend is offered.
The power converter driving the LEDs must enable a consistent light output. For dynamic LED colour mixing systems or fixtures the perceived consistency of light is extremely important. The perceived colour and intensity are the response of the human eye to the resulting spectrum of the light from LEDs of different colour and intensity. To mix different colours seamlessly the intensity of the individually coloured LEDs must be controlled with an intensity dimming range of 1:10.000. The colour mixing controller must also compensate for parameters such as temperature and ageing, and be able to adjust for LED manufacturers’ batch tolerances, e.g. RGB colours mixed to perceived white will over time turn into blue due to the lower degrading of blue LEDs. Optical feedback will allow to compensate for the brightness degradation of differently coloured LEDs over their lifetime, thus increasing the quality of the product.
As a PhD stipend holder you will be a member of a research team including the leading industrial manufacturer Martin Professional A/S and a high level university research environment with state of the art laboratory equipment. A close cooperation between the researches, senior researches and knowledge exchange with the industrial partner will be expected. All PhD students in the project are expected to participate in international conferences as authors.
Key topics: State of the art models of LED, photo detectors and LED converters, electrical and control models of optical and thermal parameters of LED enabling colour estimation, power dissipation and junction temperature, control strategy of LED strings in open loop and closed loop and simulation, design and realization of LED converter, test of LED converter in open loop and closed loop.
You may obtain further information from Associate Professor Stig Munk-Nielsen, e-mail: smn@iet.aau.dk, phone: +45 9940 9242.
The PhD application form can be downloaded from the following address:
http://adm.aau.dk/fak-tekn/phd/vacant/index.htm
Application is to be forwarded to :
Aalborg Universitet
De Ingeniør-, Natur- og Sundhedsvidenskabelige Fakulteter
Niels Jernes Vej 10
DK-9220 Aalborg Øst
For further information about stipends and salary contact Ms. Helen Kjerstein Kristensen, The Faculties of Engineering, Science and Medicine, email: hek@adm.aau.dk, phone: +45 9940 7373.
Application should include in four copies: the Masters diploma, publications, Curriculum Vitae, proposal for a PhD study plan and any other material, as well as a list of submitted material. Due to legal constraints electronic applications will not be accepted. Please quote the position reference No.HEK- 562/06-14-28047
Application deadline is the 02 June 2008.
