In this paper, a converter DC/DC for power applications is developed: battery charger for photovoltaic system, vehicle charger, helicopter power supply. It consists of using a Full-Bridge DC/DC converter which is controlled by a new analog control, designed and analyzed during this work. This control has been dimensioned so that it ensures a smooth switching of the transistors, which makes it possible to reduce the losses of power, and consequently increases the efficiency of the overall system. It allows also to increase the current and to lower the voltage to the desired value; a large generated current which reaches 50A.