Two Papers Accepted for Publication in IEEE Transactions26th September 2011
We have recently had two papers related to our work on Energy Harvesting electronics accepted for publication in the IEEE Transactions on Circuits and Systems. Both publications are a result of the EPSRC project on 'Holistic Energy Harvesting'.
Our paper on supercapacitor modelling
The first paper, 'Accurate Supercapacitor Modeling for Energy-Harvesting Wireless Sensor Nodes' investigates supercapacitors, often used in energy-harvesting wireless sensor nodes (EH-WSNs) to store harvested energy. Until now, research into the use of supercapacitors in EH-WSNs has considered them to be ideal or over-simplified, with non-ideal behavior attributed to substantial leakage currents. In this brief, we show that observations previously attributed to leakage are predominantly due to redistribution of charge inside the supercapacitor. We confirm this hypothesis through the development of a circuit-based model which accurately represents non-ideal behavior. The model correlates well with practical validations representing the operation of an EH-WSN, and allows behavior to be simulated over long periods..
The second paper, 'Photovoltaic Sample-and-Hold Circuit Enabling MPPT Indoors for Low-Power Systems' presents an ultra low-power maximum power point tracking (MPPT) circuit with a novel sample-and-hold and cold-start arrangement, enabling efficient indoor MPPT (which has not been reported, or considered possible, before). The circuit is validated in practice, and the sample-and-hold behaviour analysed using real light data.
For more information, click here.
22 Lectures Delivered in Malaysia!28th October 2013
I have just returned from a fortnight's intensive teaching visit to the University of Southampton's Malaysia Campus (USMC), at EduCity@Iskandar Nusjaya.
ECS welcomed our inital intake of 10 students onto our top-quality Electrical and Electronic Engineering (EEE) degree course, which has been offered for the first time this autumn at USMC. The EEE degree joins Southampton's undergraduate MEng in Mechanical Engineering that enrolled its first students at USMC in 2012.
Our four year 2+2 MEng... [more]
I Provide 'Expert Advice' on Haptic Technology8th October 2013
This morning I was contacted by a journalist from 'The Engineer' magazine, who was writing a piece about research at Bristol University on the use of ultrasound as a tactile technology. The technology, which I saw demonstrated at a conference a few years ago, uses inaudible ultrasound waves to give the sensation of touch to the fingertips, and by using an array of transducers, can target the sensation at particular locations. My comments on the technology included:
"'Touchless haptics is prob... [more]