The technology of wireless charging, also referred to as wireless power transfer (WPT) or inductive power transfer (IPT), has been successfully applied at the low power level, such as applications in the medical field or in small devices such as smart phones Along with the fast growing interest in electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs), wireless charging is becoming a new way of charging batteries. In this paper, the design of a WPT system for electrical bus fast wireless charging stations will be presented. The system is composed by a two stage switching power supply, i.e. a multiphase soft-switching buck converter controlling the output power and a high-frequency resonant full-bridge converter connected to a series-series compensation topology. The input DC voltage is around 700V and the maximum output power is 22kW. An analytical description of the system is reported, as well as simulations and experimental results based on a TMS320F28335 DSP are presented to confirm the effectiveness of the proposed syste
The conventional internal combustion engine (ICE) produces an inherent oscillating torque which causes a significant amount of vibration and noise and also reduces the power train life time. An opportunity for ICE used as range extender is to reduce the speed pulsation by using the electric machine (EM) for active damping of the torque ripple by applying an inverse torque sequence to crankshaft. This paper presents three different solutions for torque damping control system, i.e. a conventional proportional integral controller, an observer-based torque feed-forward technique and an original approach based on an adaptive multi-resonant controller. In order to better understand the torque engine oscillation phenomena an effective ICE model has been implemented aiming at comparing the effectiveness of the different techniques by simulation analysis. Experimental investigations are based on a dedicated laboratory test bench composed by an actual ICE connected to the EM. Obtained results show that a appreciable reduction of speed ripple and noise is achieved with the proposed active damping techniqu
This paper introduces a new multiphase phase interleaved three-level neutral point clamped (NPC) buck converter. Compared to the conventional three phase buck, this new topology allows to split the output current between two inductors, increasing the energy density and thus reducing the inductor size. Furthermore, the output voltage and current ripple can be significantly reduced and the ripple frequency is fourth times the switching one, allowing to employee a smaller output capacitance. The operating modes and switching intervals of the proposed topology are presented and discussed. A simulation model of the converter has been developed in the standalone PLECS tool, including conduction and switching loss models, based on commercial silicon carbide power devices. Extensive simulation have been performed in order to verify the effectiveness of the proposal and to highlight the specific features of this converter, mainly phase and output current ripple reduction, nested current/voltage control scheme and current sampling issues, losses and efficiency.
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