New harvesting system based on photovoltaic cells with antireflexive ZnO nanoparticles coatings and DC/DC isolation conversion

In this paper we propose a new design of havesting system based on photovoltaic cells with antireflexive ZnO nanoparticles coatings and DC/DC isolation conversion. The system is based on an assembly of four photovoltaic polycrystalline cells provided with antireflexive ZnO nanoparticles coatings. The solar cells have been tested in terms of efficiency and output power for irradiance values in the range of 100 W/m 2 — 1000 W/m 2 . The system of photovoltaic cells generates and transfers the energy to a DC/DC converter with galvanic separation. The converter uses a micro transformer with planar coils, ferrite magnetic circuit and magnetic colloidal nanofluid. The proposed model of micro transformer has been tested independently for frequencies of 100 kHz, 300 kHz and 500 kHz (which stands as the commutation frequency of the DC/DC converter), showing an efficient operation. The inductivity measurement proves that the inductivity of the primary winding is similar to the optimum inductivity of the DC/DC converter indicated by Texas Instruments manufacturing company which uses the LM 25017 integrated electronic circuit.