The power of photovoltaic cells (PV) varies with illumination, temperature and radiation. The paper introduces a new matching method and a simple economical implementation for the DC-DC conversion applied at PV terminals. The method uses a "boost" configuration controlled only by trigger, flip-flop and analog circuits. It results minimal complexity and component number. An event detection method, changes the sense of the reference current variation only when the power derivative becomes

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... . A repetitive initializing procedure eliminates the effect of changing environmental conditions. Simulation results are obtained for step variation of the PV device characteristics.