CN-122000181-A - Magnetic element

Abstract

A magnetic element comprises a primary winding, a secondary winding and at least one tertiary winding, which are stacked to form a symmetrical inductance structure or an asymmetrical inductance structure. By the distance relation between the primary winding, the secondary winding and at least one tertiary winding of the symmetrical inductor structure, leakage inductance can be balanced, tolerance can be stabilized, reverse current can be eliminated, ac losses of the tertiary winding can be reduced, and/or total losses can be reduced. Through the distance relation among the primary winding, the secondary winding and at least one tertiary winding of the asymmetric inductance structure, leakage inductance can be adjusted more flexibly, tolerance is stabilized, and coupling energy is reduced.

Inventors

• LAI YUCHENG
• SUN BAIJUN
• XIE YIMIN
• ZHANG SHAOWAI
• LI JUNHONG
• LIAO JUNYING

Assignees

• 乾坤科技股份有限公司

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20251031

Claims (20)

1. 1. A magnetic element, comprising: a magnetic core; a primary winding disposed in the core; a secondary winding disposed in the magnetic core; A magnetic element arranged between the primary winding and the secondary winding; the first tertiary winding is arranged outside the primary winding; The second tertiary winding is arranged outside the secondary winding; Wherein the secondary winding is separated from the second tertiary winding by a first distance d1, the secondary winding is separated from the first tertiary winding by a second distance d2, the primary winding is separated from the first tertiary winding by a third distance d3, and the primary winding is separated from the second tertiary winding by a fourth distance d4; wherein the first distance d1, the second distance d2, the third distance d3 and the fourth distance d4 satisfy the following relationships: 。
2. 2. the magnetic element of claim 1 wherein the core has an inner leg and the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding are disposed at different positions along the length of the inner leg and do not overlap each other.
3. 3. The magnetic element of claim 1 wherein the number of turns of the first tertiary winding and the second tertiary winding are both less than the number of turns of the primary winding and the secondary winding.
4. 4. The magnetic element of claim 3 wherein the number of turns of the first tertiary winding and the second tertiary winding is less than 1/2 of the number of turns of the primary winding and the secondary winding.
5. 5. The magnetic element of claim 1 wherein at least one of the primary winding, the secondary winding, the first tertiary winding, and the second tertiary winding is wound from a plurality of insulated wires.
6. 6. The magnetic element of claim 5 wherein the plurality of insulated wires comprises a plurality of stranded wire layers, each of the stranded wire layers being surrounded by a first insulating layer, a first stranded wire layer of the plurality of stranded wire layers comprising a plurality of strands, each of the strands being surrounded by a second insulating layer.
7. 7. The magnetic element of claim 1 wherein any of the primary winding, the secondary winding, the first tertiary winding, and the second tertiary winding is litz wire or a metallic conductive sheet.
8. 8. The magnetic element of claim 1 wherein the magnetic core comprises an I-shaped magnetic core, a first U-shaped magnetic core, and a second U-shaped magnetic core, the first U-shaped magnetic core and the second U-shaped magnetic core being arranged side by side to provide an inner leg, a heat dissipating material being filled in a gap of the inner leg, the I-shaped magnetic core being disposed on the first U-shaped magnetic core and the second U-shaped magnetic core.
9. 9. The magnetic element of claim 1 wherein the core has an inner leg and at least two outer legs, the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding being wound around the inner leg.
10. 10. The magnetic element of claim 1 further comprising: a housing in which the magnetic core is disposed; A heat conductive filler filled in the housing and covering at least a portion of an inner leg of the magnetic core and at least a portion of the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding, and The conductive piece is arranged above the magnetic core and an opening of the shell and comprises two conductive metals which are coated by an insulating material; Wherein, this first tertiary winding and this second tertiary winding are connected to this electrically conductive piece, and a portion of this electrically conductive piece is buckled and is got into in this heat conduction filler.
11. 11. The magnetic element of claim 10 wherein the two conductive metals are disposed opposite each other on opposite sides of the core and do not contact the core and the housing, and wherein the two bent structures of the two conductive metals outside the core extend into the thermally conductive filler and do not contact the core and do not extend to the bottom of the housing.
12. 12. The magnetic element of claim 1 further comprising: a housing in which the magnetic core is disposed; A heat conductive filler filled in the housing and covering at least a portion of an inner leg of the magnetic core and at least a portion of the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding, and The conductive piece is arranged on one side of the magnetic core and comprises two conductive metals which are coated by an insulating material; Wherein the first tertiary winding and the second tertiary winding are connected to the conductive member, and a portion of the conductive member is covered by the heat conductive filler.
13. 13. The magnetic element of claim 10 wherein the two conductive metals are disposed side by side on one side of the magnetic core and do not contact the magnetic core, the two bent structures of the two conductive metals disposed outside the magnetic core extend into the heat conductive filler and do not contact the magnetic core, the first tertiary winding and the second tertiary winding extend to the bottom of the housing and are connected to the plurality of engaging holes of the two conductive metals, such that the first tertiary winding is connected in parallel with the second tertiary winding, the two horizontal structures of the two conductive metals extend out of the insulating material to form two electrodes of the first tertiary winding and the second tertiary winding, an insulating member is disposed at the bottom of the housing, and the plurality of engaging holes of the two conductive metals are disposed in a receiving space of the insulating member.
14. 14. A magnetic element, comprising: a magnetic core; a primary winding disposed in the core; a secondary winding disposed in the core, and A third-stage winding arranged between the primary winding and the secondary winding; Wherein the secondary winding is separated from the tertiary winding by a first distance d1, and the primary winding is separated from the tertiary winding by a second distance d2; Wherein the first distance d1 and the second distance d2 satisfy the following relationship: 。
15. 15. the magnetic element of claim 14 wherein the core has an inner leg and the primary winding, the secondary winding and the tertiary winding are disposed at different positions along the length of the inner leg and do not overlap each other.
16. 16. The magnetic element of claim 14 wherein the tertiary winding has fewer turns than the primary winding and the secondary winding.
17. 17. The magnetic element of claim 16 wherein the number of turns of the tertiary winding is less than 1/2 of the number of turns of the primary winding and the secondary winding.
18. 18. The magnetic element of claim 14 wherein at least one of the primary winding, the secondary winding, and the tertiary winding is wound from a plurality of insulated wires.
19. 19. The magnetic element of claim 18 wherein the plurality of insulated conductors comprises a plurality of stranded conductor layers, each of the stranded conductor layers being surrounded by a first insulating layer, a first stranded conductor layer of the plurality of stranded conductor layers comprising a plurality of strands, each of the strands being surrounded by a second insulating layer.
20. 20. The magnetic element of claim 14 wherein any of the primary winding, the secondary winding, and the tertiary winding is litz wire or a metallic conductive sheet.

Description

Magnetic element Technical Field The present invention relates to a magnetic element, and more particularly to a magnetic element with adjustable leakage inductance. Background Transformers are an important magnetic element for increasing or decreasing the voltage. Transformers are installed in most circuits. In a multi-port charger (multi-port charger), electromagnetic coupling between connection ports and voltage stability are closely related to leakage inductance of a transformer. Leakage inductance determines the quality of the energy coupling and the degree of interference between the ports. Therefore, how to adjust the leakage inductance of the transformer of the multiport charger becomes a great problem in design. Disclosure of Invention The present invention provides a magnetic element with adjustable leakage inductance to solve the above-mentioned problems. According to one embodiment, the magnetic element of the present invention comprises a core, a primary winding, a secondary winding, a magnetic member, a first tertiary winding, and a second tertiary winding. The primary winding is disposed in the magnetic core. The secondary winding is disposed in the magnetic core. The magnetic piece is arranged between the primary winding and the secondary winding. The first tertiary winding is arranged outside the primary winding. The second tertiary winding is arranged outside the secondary winding. The secondary winding is separated from the second tertiary winding by a first distance d1, the secondary winding is separated from the first tertiary winding by a second distance d2, the primary winding is separated from the first tertiary winding by a third distance d3, and the primary winding is separated from the second tertiary winding by a fourth distance d4. The first distance d1, the second distance d2, the third distance d3 and the fourth distance d4 satisfy the following relationships:。 In one embodiment, the magnetic core has an inner leg, and the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding are disposed at different positions along the length direction of the inner leg and do not overlap each other. In one embodiment, the number of turns of the first tertiary winding and the second tertiary winding is smaller than the number of turns of the primary winding and the secondary winding. In one embodiment, the number of turns of the first and second tertiary windings is less than 1/2 of the number of turns of the primary and secondary windings. In one embodiment, at least one of the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding is wound from a plurality of insulated wires. In one embodiment, the multi-strand insulated conductor comprises a plurality of stranded conductor layers, each stranded conductor layer being surrounded by a first insulating layer, a first stranded conductor layer of the plurality of stranded conductor layers comprising a plurality of strands, each strand being surrounded by a second insulating layer. In an embodiment, any one of the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding is litz wire or a metal conductive sheet. In an embodiment, the magnetic core includes an I-shaped magnetic core, a first U-shaped magnetic core and a second U-shaped magnetic core, the first U-shaped magnetic core and the second U-shaped magnetic core are arranged side by side to provide an inner pillar, a heat dissipation material is filled in a gap of the inner pillar, and the I-shaped magnetic core is disposed on the first U-shaped magnetic core and the second U-shaped magnetic core. In one embodiment, the magnetic core has an inner leg and at least two outer legs, and the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding are wound around the inner leg. In one embodiment, the magnetic element further comprises a housing, a thermally conductive filler, and an electrically conductive member. The magnetic core is arranged in the shell. The heat conducting filler is filled in the shell and coats at least one part of an inner column of the magnetic core and at least one part of the primary winding, the secondary winding, the first tertiary winding and the second tertiary winding. The conductive member is disposed above the magnetic core and an opening of the housing, and comprises two conductive metals covered by an insulating material. The first tertiary winding and the second tertiary winding are connected to the conductive member, and a portion of the conductive member is bent into the thermally conductive filler. In an embodiment, the two conductive metals are oppositely disposed at two sides of the magnetic core and do not contact the magnetic core and the housing, and two bending structures of the two conductive metals located at the outer side of the magnetic core extend into the heat conductive fi