DIRECT CURRENT CONVERTER

This application provides a direct current converter, including a first BUCK circuit, a second BUCK circuit, a charge pump circuit, a drive circuit, a controller, and a power conversion circuit. A photovoltaic module is connected to the power conversion circuit. The power conversion circuit is connected to an inverter. A direct current output by the power conversion circuit is converted into an alternating current via the inverter, and the alternating current is connected to a power grid. The direct current converter implements maximum power point tracking of the photovoltaic module. The first BUCK circuit provides a first power supply for the drive circuit, and provides a power supply for the charge pump circuit. The charge pump circuit provides a second power supply for the drive circuit. The second BUCK circuit provides a power supply for the controller.