Maximum-power tracker

The invention discloses a maximum-power tracker which comprises an input end positive electrode connector, an input end negative electrode connector, an output end positive electrode connector, and an output end negative connector. The maximum-power tracker further comprises an insulating DC-DC converter with an input end positive electrode, an input end negative electrode, an output end negative electrode, and an output end negative electrode. The input end positive electrode of the insulating DC-DC converter is electrically connected with the input end positive electrode connector. The output end positive electrode of the insulating DC-DC converter is electrically connected with the output end positive electrode connector. The output end negative electrode of the insulating DC-DC converter is electrically connected with the output end negative electrode connector. The input end negative electrode of the insulating DC-DC converter is electrically connected with the output end positive electrode connector C. The output end negative electrode connector is electrically connected with the input end negative electrode connector. Due to the fact that the input end negative electrode of the insulating DC-DC converter is electrically connected with the output end positive electrode and the output end positive electrode connector, a part of voltage is overlapped outside the converter, the efficiency of the whole system is made to be maximized, and voltage withstanding requirements for power and electronic elements of the converter are reduced. Consequently, cost is reduced, and the service life is prolonged.