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Abstract
Two MPPT systems using DC - DC boost converter for small scale photovoltaic transducers are presented. The MPPT systems track di erent illumination intensities through changing the input impedance of the boost converter. In the first system, the open circuit voltage of the photovoltaic transducer is compared with a reference voltage and the switching frequency of the boost converter is changed accordingly. In the second system, a perturb and observe algorithm is implemented using new circuit techniques. It works by storing the output voltage at a constant test load, perturbing the operating frequency of the DC - DC converter, and then comparing the new output voltage to the previous one