Magnetic integrated device including multiple core columns and windings and power conversion circuit

A power conversion circuit, comprising:

• a switching conversion circuit, a three-phase resonant circuit, a three-phase transformer, a rectifier circuit, and a filter circuit, wherein a magnetic integrated device forms the three-phase resonant circuit, and wherein the magnetic integrated device comprises:
• a first magnetic core base and a second magnetic core base that are parallel;
• a first magnetic core column, a second magnetic core column, and a third magnetic core column that are located between the first magnetic core base and the second magnetic core base;
• and
• a first winding, a second winding, and a third winding are wound on the first magnetic core column, the second magnetic core column, and the third magnetic core column, respectively, in a same manner to form a closed magnetic flux loop, wherein the first winding, the second winding, and the third winding are separately configured to connect to a branch of a three-phase parallel circuit, and in all branches of the three-phase parallel circuit, values of currents are the same, and a difference between each two current phases is 120 degrees.