Air pollution is one of the world’s leading risk factors for death. And transportation is one of the largest pollution sources. Therefore, electrification becomes a necessary step in reducing air pollution and save lives. As a result, electric vehicles are becoming the future trend in automotive industries. However, there are still some of the concerns which stop consumers from purchasing electric vehicles. Charging faster and longer driving range are two factors that consumers care most. So how to solve these concerns? A high-efficiency charger could be one solution. Level 2 charger takes less time in charging than level 1. But with the lack of charging facilities right now, charging should be available in all situations. This thesis investigates a high-efficiency on-board charger (OBC) that could be used both at residences and at charging stations. The OBC is able to operate at a wide output battery range as well. High efficiency means low losses. Therefore, the proposed topology uses the least number of components to minimize the losses as much as possible. The efficiency is further optimized by using wide bandgap device Gallium Nitride. Since Gallium Nitride shows superior performance in high power applications. The proposed OBC combines a GaN-based bridgeless totem-pole PFC with a synchronous buck converter with innovative active filtering to allow a much smaller dc-link capacitance. The carefully designed passive components occupy less space and help improve power density. Film capacitors are used to replace the conventional electrolytic capacitors since the latter do not have good reliability for automotive applications. The proposed OBC is designed with small current ripple percentage and small output voltage ripple percentage. The simulation results show a high peak efficiency over 98% at both level 1 and level 2 charging mode. The power factor (PF) is over 0.998 and the total harmonic distortion percentage (THD %) is less than 5% at full load condition (3.3 kW). In one sentence, the charger is simple, high efficiency, works with a universal charging system, with a wide output range, and compact. / Thesis / Master of Applied Science (MASc)

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L'autonomie moyenne des voitures électriques commercialisées actuellement reste limitée par rapport aux véhicules thermiques. Pour pallier ce problème, la capacité de la batterie peut être augmentée ou bien la charge peut être facilitée en réduisant le temps de charge et ceci en augmentant la puissance de charge.L'infrastructure de charge rapide de type DC étant encore limitée, un progrès considérable consiste à embarquer le chargeur dans le véhicule en réutilisant tout, ou une partie de l'électronique de puissance déjà disponible pour propulser le véhicule. Le chargeur est alors nommé chargeur intégré.Au cours des dernières années, plusieurs chargeurs intégrés ont été proposés, mais peu d'entre eux ont été industrialisés vue qu'ils présentent des inconvénients que l'on cherchera à surmonter ou réduire.Dans le cadre de cette thèse notre objectif principal est donc de concevoir une nouvelle topologie de convertisseur permettant la charge de la batterie à moindre coût.Plusieurs idées permettant l'innovation sont proposées et une solution répondant au mieux au cahier de charges est retenue. Cette topologie est étudiée en détails (contrôle, dimensionnement, harmoniques, CEM, etc.). Finalement un prototype est réalisé pour valider le concept proposé. / To date, the range autonomy of most electric vehicles is still lower than conventional fuel based vehicles and charging times are significantly longer. To overcome this problem, battery capacity could be increased but more importantly high power fast charging should be accessible everywhere.The widespread deployment of public DC fast charging stations is still difficult to achieve. So, in order to have a better spreading of the charge spots and a better coverage, it is also necessary for the vehicle to be charged from an on-board charger that could be plugged into three-phase AC power outlets.Furthermore, because the battery is charged only when the car is parked -except for regeneration at braking-, using the on-board traction system components to form an integrated charging device is possible. This kind of topology is called an integrated charger which allows designing a charger small enough to be embedded in a vehicle at an affordable cost.Several non-isolated on-board integrated charging topologies are proposed in this thesis and the one that best meets some predefined specifications is selected. This topology is studied in details and validated by simulation software. A laboratory prototype is also built to verify the performance of this multi-purpose traction/charger converter.