More Efficient Inductive Electric Vehicle Charger

Paper #:
  • 2017-01-1216

Published:
  • 2017-03-28
Abstract:
Electric cars can help cities, but those in apartments lack charging, absent the well-controlled private garages where most electric vehicles (EVs) are currently charged. Environmentally robust, hands-free, inductive chargers would be ideal, but energy efficiency suffers. We asked whether the precise parking alignment provided by self-driving cars could be used to improve inductive charging efficiencies. To answer this question, we split an inductor-inductor-capacitor (LLC) battery charger at the middle of the isolation transformer. The power factor correction, tank elements, and transformer primary windings are stationary, while the transformer secondary, rectifiers, and battery control logic are on the vehicle. The transformer is assembled each time the EV parks. A variety of transformers were tested for efficient energy transfer coincident with spacing to accommodate insulation on both the charger and vehicle side of the interface. Transformer parameters predict a wall to battery energy efficiency of 95%, comparable to an onboard charger. A hands-free, inductive, battery charger can deliver charging efficiencies comparable to galvanically connected onboard chargers – with no degradation in performance or safety when covered with a variety of contaminants. This shows promise for night charging of EVs at apartments, thus providing high public benefit with minimum public infrastructure expense.
Also in:
  • SAE International Journal of Alternative Powertrains - V126-8EJ
  • SAE International Journal of Alternative Powertrains - V126-8
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