Power converter apparatus including llc resonant circuits and wide range of output voltage with higher efficiency

A power converter apparatus comprising:

• a first input terminal and a second input terminal;
• a plurality of leg circuits, each of the plurality of leg circuits including two switch circuits connected in series with each other between the first input terminal and the second input terminal;
• a transformer including a primary winding and a secondary winding, the primary winding having a first terminal and a second terminal;
• and
• at least one capacitor,
• wherein the at least one capacitor is connected between the first terminal or the second terminal of the primary winding of the transformer, and a node between the two switch circuits in at least one leg circuit among the plurality of leg circuits, and
• wherein the first terminal of the primary winding of the transformer is connected to at least two nodes in at least two first leg circuits among the plurality of leg circuits via at least two first circuit portions, respectively, each of the at least two nodes being disposed between the two switch circuits in one of the at least two first leg circuits, at least one of capacitances and inductances being different in the at least two first circuit portions.