A power sensing circuit for solar cells MPP tracking

This paper presents a versatile power sensing circuit to be used for maximum power point tracking in the operation of solar cells. The circuit consists of an operational transcoductance amplifier (OTA), a current conveyor (CCD) and a current mirror. The power sensing circuit was simulated, under varying solar radiation density and different output voltage and current values of the solar cell. According to the simulation results presented in detail, accuracy of about 96% of the real measured power can be achieved by the proposed configuration. The power consumption of the circuit is estimated from about 2μW up to 10μW, depending on the output voltage of the solar cell and certain circuit parameters.