Charging circuit and device of multifunctional self-adaptive photovoltaic power supply controller

The invention discloses a charging circuit and device of a multifunctional adaptive photovoltaic power controller. The charging circuit and device of the multifunctional adaptive photovoltaic power controller are used for the multifunctional adaptive photovoltaic power controller. The circuit comprises a signal sampling circuit, an MOS tube driving circuit, a BUCK step-down circuit and a direct current conversion circuit, the signal sampling circuit is connected with the direct current conversion circuit through the MOS tube driving circuit and the BUCK step-down circuit in sequence to supply power to electric equipment, and the signal sampling circuit collects the voltage difference of the power output end of a photovoltaic panel in a set period to supply power to the electric equipment. And the magnitude of the output pulse modulation signal PWM is controlled, so that the magnitude of the output voltage of the BUCK step-down circuit is controlled, and the tracking of the maximum power point of the power out