System comprising a photovoltaic cell and a luminous intensity measuring device and method for measuring luminous intensity received by the photovoltaic cell

摘要

The measuring device determines the luminous intensity received by a photovoltaic cell electrically connected at output to an electrical energy storage unit via a DC-DC converter and to an external capacitor arranged in parallel to the DC-DC converter. It includes:a variable resistor arranged between an input terminal and an earth terminal;a control unit arranged to vary the value of the variable resistor within a plurality of determined resistance values;a discharge unit for the external capacitor controlled by the control unit so as to discharge said external capacitor to a reference voltage; anda photovoltaic cell voltage change detector which is arranged to be capable of determining, when a measurement is made, whether the voltage at said input terminal increases or decreases between two instants separated by a given time interval.