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This paper presents a maximum power point tracking (MPPT) circuit for an Unmanned Air Vehicle. The design of the MPPT is proposed utilizing a boost-converter topology. The power of the photovoltaic cells is monitored by a closed-loop microcontroller based control system, and the PWM signal of the boost converter continuously adjusted to extract maximum power. The MPPT is used to charge the Lithium-ion Polymer battery and feed the electrical load of the unmanned aircraft.