Abstract: Provided are a photovoltaic system and a control method. The system comprises: a conversion circuit, a power taking circuit, a trip switch, a switching power supply and a controller. The trip switch is connected between the conversion circuit and an input end of a converter. The power taking circuit is configured to take power from at least one photovoltaic module string and supply power to the switching power supply. The switching power supply is configured to supply power to the controller and the trip switch when the power taking circuit provides power normally. The controller is configured to, when a photovoltaic module string has a fault, at least disconnect the trip switch corresponding to the fault photovoltaic module string, to disconnect connection between the faulty photovoltaic string and the conversion circuit.

Abstract: A power supply control protection system includes: a switching power supply, a main controller, an auxiliary controller, a sampling circuit and an energy storage element, the switching power supply is used for supplying power to the sampling circuit, the main controller and the auxiliary controller; the energy storage element is used for providing an auxiliary power supply for the sampling circuit, the main controller and the auxiliary controller; the sampling circuit has a self-checking function and sends a self-checking result to at least one of the main controller and the auxiliary controller; when the self-checking result indicates that the sampling circuit is normal, the main controller or the auxiliary controller controls a converter to work; and the main controller and the auxiliary controller communicate with each other. When a switching power supply cannot normally supply power, an energy storage element supplies power to a circuit.