Dc-dc converter arrangement

A method for interconnecting a photo-voltaic panel to a battery for an electric vehicle by using a direct-current to direct-current (DC-DC) converter arrangement comprising a first terminal, a second terminal, a first DC-DC converter stage, and a second DC-DC converter stage, the method comprising:

• connecting the photo-voltaic panel to the first terminal for providing a first DC voltage at the first terminal;
• connecting the battery to the second terminal for providing a second DC voltage at the second terminal;
• converting the first DC voltage into an intermediate DC voltage by the first DC-DC converter stage;
• and
• converting the first DC voltage and the intermediate DC voltage into the second DC voltage by the second DC-DC converter stage for loading the battery with a full power provided by the photo-voltaic panel,
• wherein the second DC voltage is galvanically isolated from the first DC voltage and the intermediate DC voltage by the second DC-DC converter stage.

A method for providing a control signal for controlling a direct current to direct current (DC-DC) converter arrangement, the DC-DC converter arrangement comprising:

• a first terminal for connecting the DC-DC converter arrangement to a photo-voltaic panel, the first terminal being configured to provide a first DC voltage;
• a second terminal for connecting the DC-DC converter arrangement to a battery, the second terminal being configured to provide a second DC voltage;
• a first DC-DC converter stage configured to convert the first DC voltage into an intermediate DC voltage;
• and
• a second DC-DC converter stage configured to convert the first DC voltage and the intermediate DC voltage into the second DC voltage for loading the battery with a full power provided by the photo-voltaic panel,
• wherein the second DC-DC converter stage is configured to galvanically isolate the second DC voltage from the first DC voltage and the intermediate DC voltage, and wherein the method comprises:
• determining the first DC voltage and the intermediate DC voltage of the DC-DC converter arrangement;
• applying a Maximum Power Point Tracking (MPPT) scheme based on a predetermined relationship of the first DC voltage and the intermediate DC voltage,
• wherein the predetermined relationship of the first DC voltage and the intermediate DC voltage is based on a proportionality of an average voltage between the first DC voltage and the intermediate DC voltage with an output power of the photo-voltaic panel;
• and
• providing the control signal for controlling the first DC-DC converter stage based on the MPPT scheme.