The work carried out in this thesis focused on the optimization of the energy consumption of connected devices and specifically on their radiofrequency (RF) part. The main objective is to propose standby modes with zero energy consumption. More precisely, it is to propose standby modes which are independent on the main energy souce (battery). The w...
Avec des gradients de températures élevés et permanents, une aciérie est le lieu idéal pour installer des thermogénérateurs. L'électricité récupérée est stockée dans des supercapacités puis conditionnée pour alimenter un capteur sans fil communicant (une sonde lambda très énergivore et ses auxiliaires). La particularité du projet est liée à l'envir...
Cutting greenhouse emissions, and improving the global energy efficiency have been themain goals of researches in the field of caloric materials for more than two decades now (1).So far, the research of new solid state cooling devices, using magnetocalorics (MC) as re-frigerant, has been primarily focused on achieving better efficiency (2). Recentl...
This article exhibits the sizing, modelling, and characterization of a power supply (output 3.3 V, 200 mA max, 11 days full autonomy) dedicated to power a wireless sensor node without battery but usable as simply as with a battery. This system is modular for various light levels (indoor and outdoor). It is easily integrable into a sensor node, usin...
This thesis is based around the use of energy harvesting in systems, specifically for a Bluetooth Low Energy (BLE) mesh testbed. This BLE mesh is located in a well lit lab and is currently powered by mains electricity. Systems such as the BLE mesh are considered Internet of Things (IoT). The market for these systems is rapidly expanding and in turn...
In the present work we report the fabrication and characterization of a novel MEMS device intended to power leadless pacemakers. The presented device has the dimensions to fit inside a capsule implantable via cardiac catheterization. To our knowledge this is the first electrostatic MEMS energy harvester allowing such application. We show that the p...
Les réseaux de capteurs sont devenus omniprésents dans notre quotidien, que ce soitdans les milieux privés ou professionnels. Ils permettent de mesurer diverses grandeursphysiques selon un contexte applicatif. Dans le cadre des campus universitaires connectés,l’utilisation de réseaux de capteurs permet de superviser les coûts de fonctionnement desb...
Embedded devices powered with environmental energy harvesting, have to sustain computation while experiencing un- expected power failures. To preserve the progress across the power interruptions, Non- Volatile Memories (NVMs) are used to quickly save the state. This dissertation first presents an overview and comparison of different NVM technologie...
Embedded devices powered with environmental energy harvesting, have to sustain computation while experiencing unexpected power failures.To preserve the progress across the power interruptions, Non-Volatile Memories (NVMs) are used to quickly save the state. This dissertation first presents an overview and comparison of different NVM technologies, b...
At the same time that we’re solving climate change, we are building cities for another 3 billion people until 2050. That’s a doubling of the urban environment. The most extensive of this construction, and especially housing projects for the coming decades, will take place in emergent and developing countries. We, as architects, engineers, developer...
