Patent ID: 8116103

Claim:
A device for feeding electric energy into a power grid, containing a DC converter intended for connection to a direct voltage generator and an inverter connected thereto and intended for connection to the power grid, which contains a bipolar voltage intermediate circuit with two capacitors mounted in series, said capacitors being connected together at a ground terminal connected to a negative output of the direct voltage generator, said DC converter comprising at least two diodes, one switch and one storage reactor containing one first winding and one second winding, these two windings being magnetically coupled together in such a manner that, in a first switching condition, the first winding is loaded by the direct voltage generator and the second winding via the first winding by virtue of the magnetic coupling and that, in a second switching condition, the two windings are unloaded via a respective one of the two capacitors, which is associated, and via an associated diode, wherein a first terminal of the first winding is connected to a first connection point with a first switch and that a second terminal of the first winding is connected to a second switch at a second connection point in such a manner that the first winding forms, together with the two switches, a first electric circuit connected to associated outputs of the direct voltage generator and moreover lies in a second electric circuit that leads from the ground terminal through a first diode, the first connection point, the first winding, the second connection point, a second diode and the capacitor associated thereto back to the ground terminal and that the second winding is arranged in a third electric circuit that leads from the ground terminal, via the capacitor associated to said winding, via a third diode and the second winding back to the ground terminal.