Three-phase transformer assembly and power module

1. A three-phase transformer assembly comprising two three-phase transformers, the three-phase transformer assembly comprising:

a magnetic core comprising a first cover plate, a second cover plate and magnetic pillar units, wherein the first cover plate and the second cover plate are arranged opposite to each other, the magnetic pillar units are sandwiched between the first cover plate and the second cover plate, the magnetic pillar units comprise a first magnetic pillar unit, a second magnetic pillar unit, and a third magnetic pillar unit, each of the magnetic pillar units comprises a first magnetic pillar and a second magnetic pillar; and

windings comprising a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding,

wherein the first winding is wound on the first magnetic pillar of the first magnetic pillar unit, the fourth winding is wound on the second magnetic pillar of the first magnetic pillar unit, and a first excitation current flowing through the first winding surrounds the first magnetic pillar of the first magnetic pillar unit in a direction opposite to a direction in which a fourth excitation current flowing through the fourth winding surrounds the second magnetic pillar of the first magnetic pillar unit;

wherein the second winding is wound on the first magnetic pillar of the second magnetic pillar unit, the fifth winding is wound on the second magnetic pillar of the second magnetic pillar unit, and a second excitation current flowing through the second winding surrounds the first magnetic pillar of the second magnetic pillar unit in a direction opposite to a direction in which a fifth excitation current flowing through the fifth winding surrounds the second magnetic pillar of the second magnetic pillar unit; and

the third winding is wound on the first magnetic pillar of the third magnetic pillar unit, the sixth winding is wound on the second magnetic pillar of the third magnetic pillar unit, and a third excitation current flowing through the third winding surrounds the first magnetic pillar of the third magnetic pillar unit in a direction opposite to a direction in which a sixth excitation current flowing through the sixth winding surrounds the second magnetic pillar of the third magnetic pillar unit.

2. The three-phase transformer assembly according to claim 1 , wherein the first magnetic pillar unit, the second magnetic pillar unit, and the third magnetic pillar unit are sequentially arranged at intervals along a first direction, the first magnetic pillar and the second magnetic pillar in each of the magnetic pillar units are arranged at intervals along a second direction, and an angle between the first direction and the second direction is ranging from 60° to 120°; and

two ends of each of the first magnetic pillars are respectively connected to the first cover plate and the second cover plate, and two ends of each of the second magnetic pillar are respectively connected to the first cover plate and the second cover plate.

3. The three-phase transformer assembly according to claim 1 , wherein the first cover plate and the second cover plate are both of integrated plate structures and are arranged in parallel, and the first magnetic pillars and the second magnetic pillars are perpendicular to the first cover plate and the second cover plate.

4. The three-phase transformer assembly according to claim 1 , wherein each of the windings comprises a primary winding and a secondary winding.

5. The three-phase transformer assembly according to claim 1 , wherein the first excitation current and the fourth excitation current have a same amplitude and phase, the second excitation current and the fifth excitation current have a same amplitude and phase, and the third excitation current and the sixth excitation current have a same amplitude and phase, and

the phases of the first excitation current, the second excitation current, and the third excitation current are different by 120°.

6. The three-phase transformer assembly according to claim 5 , wherein the direction in which the first excitation current surrounds the first magnetic pillar of the first magnetic pillar unit, the direction in which the second excitation current surrounds the first magnetic pillar of the second magnetic pillar unit and the direction in which the third excitation current surrounds the first magnetic pillar of the third magnetic pillar unit are the same.

7. A power module comprising a three-phase transformer assembly, three-phase transformer assembly comprising two three-phase transformers, the three-phase transformer assembly comprising:

a magnetic core comprising a first cover plate, a second cover plate and magnetic pillar units, wherein the first cover plate and the second cover plate are arranged opposite to each other, the magnetic pillar units are sandwiched between the first cover plate and the second cover plate, the magnetic pillar units comprise a first magnetic pillar unit, a second magnetic pillar unit, and a third magnetic pillar unit, each of the magnetic pillar units comprises a first magnetic pillar and a second magnetic pillar; and

windings comprising a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding,

wherein the first winding is wound on the first magnetic pillar of the first magnetic pillar unit, the fourth winding is wound on the second magnetic pillar of the first magnetic pillar unit, and a first excitation current flowing through the first winding surrounds the first magnetic pillar of the first magnetic pillar unit in a direction opposite to a direction in which a fourth excitation current flowing through the fourth winding surrounds the second magnetic pillar of the first magnetic pillar unit;

wherein the second winding is wound on the first magnetic pillar of the second magnetic pillar unit, the fifth winding is wound on the second magnetic pillar of the second magnetic pillar unit, and a second excitation current flowing through the second winding surrounds the first magnetic pillar of the second magnetic pillar unit in a direction opposite to a direction in which a fifth excitation current flowing through the fifth winding surrounds the second magnetic pillar of the second magnetic pillar unit; and

the third winding is wound on the first magnetic pillar of the third magnetic pillar unit, the sixth winding is wound on the second magnetic pillar of the third magnetic pillar unit, and a third excitation current flowing through the third winding surrounds the first magnetic pillar of the third magnetic pillar unit in a direction opposite to a direction in which a sixth excitation current flowing through the sixth winding surrounds the second magnetic pillar of the third magnetic pillar unit.

8. The power module according to claim 7 , wherein the power module comprises two three-phase LLC circuit modules,

the first excitation current and the fourth excitation current have a same amplitude and phase, the second excitation current and the fifth excitation current have a same amplitude and phase, and the third excitation current and the sixth excitation current have a same amplitude and phase;

the phases of the first excitation current, the second excitation current, and the third excitation current are different by 120°.

9. The power module according to claim 8 , wherein the direction in which the first excitation current surrounds the first magnetic pillar of the first magnetic pillar unit, the direction in which the second excitation current surrounds the first magnetic pillar of the second magnetic pillar unit and the direction in which the third excitation current surrounds the first magnetic pillar of the third magnetic pillar unit are the same.

10. The power module according to claim 8 , wherein the first winding, the second winding and the third winding are respectively used to form a first transformer, a second transformer and a third transformer of a first three-phase LLC circuit module of the two three-phase LLC circuit modules, and the fourth winding, the fifth winding and the sixth winding are respectively used to form a first transformer, a second transformer and a third transformer of a second three-phase LLC circuit module of the two three-phase LLC circuit modules.

11. The power module according to claim 10 , wherein each of the two three-phase LLC circuit modules comprises input terminals for electrically connecting a same DC power source; a first switch bridge arm, a second switch bridge arm and a third switch bridge arm connected in parallel between a positive electrode and a negative electrode of the input terminals; the first transformer, the second transformer and the third transformer; output terminals for electrically connecting loads; and a fourth switch bridge arm, a fifth switch bridge arm and a sixth switch bridge arm connected in parallel between a positive electrode and a negative electrode of the output terminals;

in each of the three-phase LLC circuit modules, a midpoint of the first switching bridge arm is electrically connected to a primary winding of the first transformer through a first resonant inductor, and a secondary winding of the first transformer is electrically connected to a midpoint of the fourth switching bridge arm; a midpoint of the second switching bridge arm is electrically connected to a primary winding of the second transformer through a second resonant inductor, and a secondary winding of the second transformer is electrically connected to a midpoint of the fifth switching bridge arm; and a midpoint of the third switching bridge arm is electrically connected to a primary winding of the third transformer through a third resonant inductor, and a secondary winding of the third transformer is electrically connected to a midpoint of the sixth switch bridge arm.

12. The power module according to claim 7 , wherein the first magnetic pillar unit, the second magnetic pillar unit, and the third magnetic pillar unit are sequentially arranged at intervals along a first direction, the first magnetic pillar and the second magnetic pillar in each of the magnetic pillar units are arranged at intervals along a second direction, and an angle between the first direction and the second direction is ranging from 60° to 120°; and

two ends of each of the first magnetic pillars are respectively connected to the first cover plate and the second cover plate, and two ends of each of the second magnetic pillar are respectively connected to the first cover plate and the second cover plate.

13. The power module according to claim 7 , wherein the first cover plate and the second cover plate are both of integrated plate structures and are arranged in parallel, and the first magnetic pillars and the second magnetic pillars are perpendicular to the first cover plate and the second cover plate.

14. The power module according to claim 7 , wherein each of the windings comprises a primary winding and a secondary winding.