Patent ID: 8590682

Claim:
A system for transferring electric energy to a track bound vehicle, comprising: an electric conductor arrangement for producing an alternating electromagnetic field and for thereby transferring the energy to the vehicle, wherein the electric conductor arrangement comprises a plurality of lines for carrying in each case one phase of an alternating electric current, the lines extending along the track, wherein each line is arranged in such a manner that the line produces, at each point in time while the alternating electric current is flowing through the line, a row of successive magnetic poles of an electromagnetic field, wherein the successive magnetic poles have alternating magnetic polarities, the row of successive magnetic poles extending in the travel direction of the vehicle which is defined by the track, wherein each line is adapted to carry one phase of a multi-phase alternating voltage or current, wherein the magnetic poles produced by the lines are, at each point in time, in a repeating sequence extending in the travel direction, wherein the repeating sequence corresponds to a sequence of the phases, the lines are connected to a constant-current source which is adapted to feed the lines with an alternating current having a constant mean value independently of the power which is transferred from the electric conductor arrangement to the vehicle or vehicles on the track, and the constant-current source comprises an arrangement for transforming an alternating voltage of an energy source into an alternating current, the arrangement comprising, in each line, an input inductivity at an input side of the constant-current source and an output inductivity at an output side of the constant-current source, wherein the input side is connected to an energy source, wherein the output side is connected to line sections along the track, wherein each line comprises a connection point between the input side and the output side and wherein each connection point is connected to a common same star point via a capacity.