Li-Po Battery Charger Based on the Constant Current/Voltage Parallel Resonant Converter Operating in ZVS

Battery requirements for electrical vehicles are continuously becoming more demanding in terms of energy density and reliability. Nowadays, batteries for drones must be able to supply 100 A for 15 min, not to mention the specifications required for batteries in electrical vehicles. These specifications result in more stringent specifications for battery chargers. They are required to be more efficient, flexible, and, as with any another power equipment, to have reduced size and weight. Since the parallel resonant converter can operate as a current source and as a voltage source, this paper presents a battery charger power stage for lithium ion polymer batteries, based on the above topology, operating in zero voltage switching mode, and implementing frequency and duty cycle control

Trends in Fault Diagnosis for Electrical Machines

[EN] The fault diagnosis of rotating electrical machines has received an intense amount of research interest during the last 30 years. Reducing maintenance costs and preventing unscheduled downtimes, which result in losses of production and financial incomes, are the priorities of electrical drives manufacturers and operators. In fact, both correct diagnosis and early detection of incipient faults lead to fast unscheduled maintenance and short downtime for the process under consideration. They also prevent the harmful and sometimes devastating consequences of faults and failures. This topic has become far more attractive and critical as the population of electric machines has greatly increased in recent years. The total number of operating electrical machines in the world was around 16.1 billion in 2011, with a growth rate of about 50% in the last five years [1].Henao, H.; Capolino, G.; Fernández-Cabanas, M.; Filippetti, F.; Bruzzese, C.; Strangas, E.; Pusca, R.... (2014). Trends in Fault Diagnosis for Electrical Machines. IEEE Industrial Electronics Magazine. 8(2):31-42. doi:10.1109/MIE.2013.2287651S31428

Energy-efficient control of induction motors for automotive applications

International Conference on Electrical Machines, ICEM 2010 (19. 2010. Rome

In situ antenna diagnostics and characterization system based on RFIDand Remotely Piloted Aircrafts

A cost-effective solution for in situ antenna characterization and diagnostics based on Radio FrequencyIDentification technology and Remotely Piloted Aircrafts is presented. The cost-effectiveness of the pro-posed solution is achieved by replacing the radio frequency equipment on-board the small aircrafts withRadio Frequency IDentification tags, while the Antenna Under Test is connected to a Radio FrequencyIDentification reader, thus reducing the weight and complexity of the payload of the aircrafts dedicatedto antenna measurement task. Received Signal Strength measurements are geo-referred with centimeter-level accuracy thanks to a Real Time Kinematic system. An iterative phase retrieval technique based onthe Sources Reconstruction Method is used to recover an equivalent magnetic currents distribution onthe Antenna Under Test aperture plane. The reconstructed currents distribution provides antenna diag-nostics information and enables the calculation of the antenna radiation pattern. The presented methodhas been validated by means of measurements in the UHF band for two different antenna arrays withexcellent result