Photovoltaic power supply device, in particular a photovoltaic power supply device independent of the public power grid, and charging circuitry arranged therefor

摘要

The invention relates to a photovoltaic power supply device, in particular from the public electricity grid independent photovoltaic power supply device, having a positive (204) and a negative (206) load terminal for the connection of an electrical load, with a plurality of photovoltaic cells (104) and a rechargeable battery (5), which comprises at least two series-connected battery cells (112 _i ). According to the invention, the photovoltaic cells (104) to the number of battery cells (112 _i) connected corresponding plurality of serially connected partial strings (108 _i) and each substring (108 _i) is a positive substring connection with a positive terminal and a negative Teilstringanschluss connected to a negative pole of an associated battery cell (112 _i ) or a plurality of associated parallel-connected battery cells (112 _i ). In this case, each partial string (108 _i ) between the positive and negative partial string connection can generate a maximum no-load voltage which is less than or equal to a predetermined end-of-charge voltage of the associated battery cell (112 _i ) or the associated parallel-connected battery cells (112 _i ). Furthermore, the invention relates to a circuit arrangement for charging a rechargeable battery, which is suitable for the realization of such a photovoltaic power supply device.