Multiple parallel-connected resonant converter, inductor-integrated magnetic element and transformer-integrated magnetic element

A multiple parallel-connected resonant converter, comprising:

• a first converter having a first input end and a first output end, wherein the first converter comprises a first inductor, a first transformer and a first capacitor, and the first inductor, the first transformer and the first capacitor are connected in series to form a first resonant unit;
• and
• a second converter having a second input end and a second output end, wherein the second converter comprises a second inductor, a second transformer and a second capacitor, the second inductor, the second transformer and the second capacitor are connected in series to form a second resonant unit, and the second output end is connected with the first output end in parallel,
• wherein the first transformer and the second transformer are integrated in a first magnetic element, the first magnetic element comprises a first side column, a second side column and only two central columns, wherein the two central columns are a first central column and a second central column, the first transformer comprises a first primary coil and a first secondary coil positioned on the first central column, and the second transformer comprises a second primary coil and a second secondary coil positioned on the second central column, and the first central column and the second central column have a same cross sectional area,
• wherein the first input end of the first converter is connected with the second input end of the second converter in series, magnetic fields formed by the first primary coil and the second primary coil are in opposite directions at the same time.