A method of operating an inductive power transfer system and an inductive power transfer system

Abstract

The invention relates to a method of operating an inductive power transfer system (1) for transferring power to a vehicle, wherein the inductive power transfer system (1) comprises a primary winding structure for generating an alternating electromagnetic field and a secondary winding structure for receiving the alternating electromagnetic field and generating an alternating current output voltage, wherein the alternating current output voltage is rectified and supplied to at least one energy storage element (12), wherein the rectified output voltage (Uc) is adjusted by varying a gap size of a gap between the primary winding structure and the secondary winding structure, wherein the gap size is adjusted to prepare and / or to initiate and / or to control an energy transfer process depending on charging characteristics of the at least one energy storage element (12). Furthermore, the invention relates to an inductive power transfer system for transferring energy to the vehicle.

Description

technical field [0001] The present invention relates to a method of operating an inductive power transfer system to transfer power to a vehicle and to an inductive power transfer system. Background technique [0002] Vehicles, in particular electric vehicles, more in particular rail vehicles and / or road vehicles, can be operated by means of electrical energy transmitted by means of an inductive power transmission system. Such a vehicle may comprise a circuit arrangement, which may be or part of a traction system of the vehicle, comprising receiving means adapted to receive an alternating electromagnetic field and generate an alternating current by electromagnetic induction. Furthermore, such vehicles may include a rectifier adapted to convert alternating current (AC) into direct current (DC). DC can be used to charge traction batteries or to run electrical machines. In case it is used to run electrical machines, DC can be converted to AC with the help of an inverter. [0...

AI Technical Summary

Problems solved by technology

[0024] shown in Figure 2 and used in figure 1 This two-stage arrangement of the input voltage generating means 3 in the arrangement of FIG. 3 has the disadvantage that each step, namely the boost conversion by the boost converter 7 and the step-down conversion by the buck converter 9 generate power loss

This loss increases when the voltage level of the DC input voltage of the boost converter 7 and the voltage level of the DC output voltage of the boost converter 7 are different

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