New Chapter in Inductive Charging

Recharge Your Batteries at the Red Light

04. Juni 2018, 11:28 Uhr   |  Karin Zühlke

Recharge Your Batteries at the Red Light
© Bilder: Finepower

With the development of a universal inductive charging system, Finepower, a sales and engineering company specialized in power electronics, aims to open a new chapter in charging technology for electric mobility - and beyond.

Epcos is also involved in the project as a manufacturer of coils for inductive charging systems. In addition, the Technical University of Munich (TUM), Department of Energy Conversion Technology, and the Kempten University of Applied Sciences or to be precise the Allgäu Technology Network (TNA) are supporting fundamental research.

Inductive charging systems for electric vehicles are currently the focus of intensive research, development, and standardization. A typical application example is the possibility of contactless recharging of electric vehicles in road traffic and industrial trucks. Different system characteristics of vehicles such as ground clearance, battery voltages, coil geometries, and current-carrying capacity have the consequence that each manufacturer is currently striving for an inductive loading unit developed individually for each vehicle fleet.

One of the main objectives in the development of a universal inductive charging system is to allow the highest possible tolerance in the vehicle position and to be able to charge different vehicle types with one system. "If different vehicle types are to be inductively charged, different positioning of the coils on the station side and on the vehicle side cannot be avoided, simply because of the vehicle dimensions, but above all also because of the different receiver coil geometries and configurations," explains Peter Lutter, Managing Director of Finepower. Another reason for the highest possible positioning tolerance is the fact that it is often not possibleto position the vehicle precisely enough to enable optimum energy transmission, especially at public charging pointse.g, due to parking and waiting restrictions.


in order, Any attempt to position the vehicle precisely by means of an electronic parking positioning system or manual maneuvering further reduces the already limited charging time available.

The aim of a universal charging system, as promoted by Finepower and its partners, is the use of such a charging station at conventional filling stations, public places such as parking blocks in shopping centers, airports, and railway stations. According to Lutter, short-term intermediate charging is also conceivable, for example at red traffic lights or highway rest stations: "In such cases, it is not possible to fully charge the battery due to the short duration of the energy transfer, but this increases the range of the vehicles without any additional time expenditure on the part of the driver, because all these standstill times occur independently of the vehicle's charging level. "In order to compensate for or avoid the variance of the positioning, elaborate methods have been used to keep the coil positions as ideal and constant as possible," says Lutter. "With adaptive compensation, electromagnetic interference emission can be kept low and power can be transmitted even without precise positioning measures; power transmission can be significantly increased while complying with the EMC limits, even if, for example, a vehicle is not parked perfectly," summarizes Lutter.

Finepower has already confirmed the basic function and the technical improvement goals with the help of initial measurement results. In the further course of the project, the experts will revise the adaptive compensation and the primary coil design so that, even in the event of extreme positional offset, energy can be transmitted at all and a further increase in efficiency can be achieved in rated operation.

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