New topologies of electric car use high power switching devices which must be integrated with a growing range of electronic systems in small places. A good performance of the car relies on the electromagnetic compatibility among these systems, which requires the characterization of the noise and interferences present in the system. To characterize the noise, both emission and susceptibility issues as well as coupling mechanisms must be studied. This paper presents the work performed for the electromagnetic mapping of a 4-wheel fully electric car, which involves both simulation and experimental measurements. It has been carried out within the E-VECTOORC project (FP7-INFSO-284708), in collaboration with car manufacturers such as Jaguar Land Rover and Škoda.
The characterization of the noise emissions of DC-DC
converters at system level is critical to optimize the design of the
detector and define rules for the integration strategy. This paper presents
the impedance effects on the noise emissions of DC-DC converters at system
level. Conducted and radiated noise emissions at the input and at the output
from DC-DC converters have been simulated for different types of power
network and FEE impedances. System aspects as granularity, stray
capacitances of the system and different working conditions of the DC-DC
converters are presented too. This study has been carried out using
simulation models of noise emissions of DC-DC converters in the real
scenario. The results of these studies show important recommendations and
criteria to be applied to integrate the DC-DC converters and decrease the
system noise level.
High-energy physics experiments are supplied by thousands of power supply units placed in distant areas from the front-end electronics. The power supply units and the front-end electronics are connected through long power cables that propagate the output noise from the power supplies to the detector. This paper addresses the effect of long cables on the noise propagation and the impact that those cables have on the conducted emission levels required for the power supplies and the selection of EMI filters for the front-end electronic low-voltage input. This analysis is part of the electromagnetic compatibility based design focused on functional safety to define the type of cable, shield connections, EMI filters and power supply specifications required to ensure the successful integration of the detector and, specifically, to achieve the designed performance of the front-end electronics.
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