Isolated dc-dc converter

An isolated DC-DC converter, comprising:

• n conversion circuit units, wherein n is an integer greater than or equal to 2, and each of the n conversion circuit units comprises:
• a primary circuit unit, comprising a primary bridge arm, wherein the primary bridge arm comprises two first switching components electrically connected in series, a connection node between the two first switching components forms a first connection node, and a second connection node is formed between one of the two first switching components and an input terminal;
• a secondary circuit unit, comprising a first secondary bridge arm and a second secondary bridge arm electrically connected in parallel, wherein each of the first and second secondary bridge arms comprises two second switching components electrically connected in series, a connection node between the two second switching components of the first secondary bridge arm forms a third connection node, and a connection node between the two second switching components of the second secondary bridge arm forms a fourth connection node;
• a first coupling inductor and a first capacitor electrically coupled in series between the first connection node and the third connection node;
• and
• a second coupling inductor and a second capacitor electrically coupled in series between the second connection node and the fourth connection node, wherein the first coupling inductor and the second coupling inductor are coupled to each other,
• wherein all the primary circuit units of the n conversion circuit units are electrically connected by one of connection modes comprising series connecting and parallel connecting, and all the secondary circuit units of the n conversion circuit units are electrically connected by a remaining one of the connection modes.