Patent ID: 9502921
Filing Date: 2016-11-22
CPC Classification: H02J,H04B

Claim Text:
1. A circuit for a system for contactless inductive energy transfer, wherein the circuit comprises: a primary side circuit being arranged on the primary side that can be connected to a supply voltage on the primary side, and a secondary side circuit being arranged on the secondary side that can be connected to a load which is to be supplied with energy; and a transformer stage with galvanic separation for contactless transfer of energy from the primary side to the secondary side via an air gap, wherein at least two magnetically coupled inductors for inductive energy transfer are provided which are spatially separable from one another by removing the secondary side from the primary side; wherein the transformer stage comprises a resonant converter and the secondary side circuit further comprises a subsequent stabilising stage; wherein the circuit does not provide any signal feedback of information from the secondary side to the primary side; and wherein the subsequent stabilising stage includes a Buck-converter and the transformer stage includes at least one selected from the group of an LLC-converter and an LLCC-converter, the LLC-converter or the LLCC-converter operated at a fixed frequency, the fixed frequency operated converter being supplied by a Boost-converter from a rectified power supply, the Boost-converter being at least one selected from the group consisting of an AC-DC-converter and a DC-DC-converter.