Patent ID: 8805629

Claim:
A maximum-power-point tracking device for a solar electric-generation system that includes a solar battery and a DC/DC converter, the maximum-power-point tracking device comprising: a sampling module configured to detect an output current and an output voltage of the solar battery; a controlling module configured to: determine a target current value according to an initial target current value and a preset current difference value; determine a value of an input current and a value of an output current of a proportional-integral adjustment according to the output current of the solar battery and the target current value; determine a duty cycle according to the output current of the proportional-integral adjustment; and output a controlling signal for controlling the output current of the solar battery according to the duty cycle; and a driving module configured to: receive the controlling signal from the controlling module; and output a driving signal to adjust the output current of the solar battery to the target current value according to the controlling signal.