Patent ID: 7539029

Claim:
A conversion circuit for converting electrical power provided by a solar cell into an alternating 3-phase mains electrical power, comprising: a converter for converting the electrical power provided by the solar cell into an unipolar converter output voltage provided over a first and a second converter output terminal of the converter, and an inverter for converting the converter output voltage into the 3-phase mains electrical power, the inverter including three switch assemblies, each for switching one of three 3-phase output terminals to the first or second converter output terminals, the switch assemblies being controlled by a switching control unit, characterized in that the converter includes a constant power output regulation for providing a constant converter output power over a converter output voltage range, and in that the switching control unit is arranged for switching one of the 3-phase output terminals to the first converter output terminal, one to the second converter output terminal and one intermittently to the first and second converter output terminal, and the cyclically switching of the 3-phase output terminals to accomplish that each of the 3-phase output terminals is in a cycle time of the mains in succession switched to the first converter output terminal, intermittently to the first and second converter output terminal, to the second converter output terminal, and again intermittently to the first and second converter output terminal.