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CN-122025370-A - Double-core separated solid-state transformer

CN122025370ACN 122025370 ACN122025370 ACN 122025370ACN-122025370-A

Abstract

The invention discloses a double-core separated solid-state transformer, and belongs to the technical field of power electronic conversion and high-frequency isolation transformers. The transformer consists of a primary winding module, a secondary winding module and a middle isolation module, wherein the primary winding module and the secondary winding module are oppositely arranged, and the middle isolation module is arranged between the primary winding module and the secondary winding module. The invention solves the problems of poor heat dissipation, insulation and heat dissipation mutual restriction of the inner layer winding of the traditional transformer through the double-core separation structure, improves the heat dissipation efficiency and the operation reliability, and the leakage inductance formed by the controllable insulation gap can be directly used for the LLC resonant converter, omits external resonance inductance, improves the power density, reduces the system cost and the loss, and is suitable for high-frequency high-voltage high-power application scenes such as AI data centers, new energy grid connection, intelligent micro-grids, super-charging stations, rail transit and the like.

Inventors

  • ZHANG YANXIA

Assignees

  • 西安乾元德博数字科技有限公司

Dates

Publication Date
20260512
Application Date
20260412

Claims (11)

  1. 1. The utility model provides a two-core separation type solid-state transformer, includes primary winding (1) module, vice limit winding (4) module, intermediate isolation module (7), primary winding (1) module and vice limit winding (4) module relative arrangement, intermediate isolation module (7) are located between primary winding (1) module and vice limit winding (4) module.
  2. 2. The double-core separated solid-state transformer of claim 1, wherein the primary winding (1) module comprises a primary winding (1), a primary framework (2) and a primary magnetic core (3), the primary winding (1) is uniformly wound on the primary framework (2) and sleeved on the primary magnetic core (3), the secondary winding (4) module comprises a secondary winding (4), a secondary framework (5) and a secondary magnetic core (6), the secondary winding (4) is uniformly wound on the secondary framework (5) and sleeved on the secondary magnetic core (6), and the primary magnetic core (3) and the secondary magnetic core (6) are oppositely arranged.
  3. 3. The double-core separated solid-state transformer according to claim 2, wherein the primary side magnetic core (3) and the secondary side magnetic core (6) are of various types such as E type, U type, PQ type, PM type or RM type.
  4. 4. The double-core separated solid-state transformer according to claim 2, wherein the central column end surfaces of the primary side magnetic core (3) and the secondary side magnetic core (6) are attached to the vertical surface of the middle isolation module (7) in parallel, and can be tightly cut, a certain gap can be reserved, and the attaching gap is 0.1 mm-0.5 mm.
  5. 5. The dual core split solid state transformer of claim 4, wherein said mating gap is filled with thermally conductive silicone grease.
  6. 6. The dual-core split solid-state transformer according to claim 1, wherein the intermediate isolation module (7) is an isolation board made of high-performance insulating materials such as Polyimide (PI), epoxy resin or polytetrafluoroethylene, the thickness of the isolation board is 0.5 mm-10.0 mm, and the insulation thickness can be determined according to the insulation voltage requirement.
  7. 7. The double-core separated solid-state transformer according to claim 6, wherein the isolation plate is made of a multi-layer composite insulating material, wherein the middle of the isolation plate is a polyimide film with the thickness of 0.3-10.0 mm, and modified epoxy resin coatings with the thickness of 0.1-0.3 mm are coated on two sides of the isolation plate.
  8. 8. The double-core separated solid-state transformer according to claim 2, wherein the primary winding (1) and the secondary winding (4) are uniformly wound on respective frameworks by litz wire sections, and a cooling air duct of 0.3-5 mm is reserved between each two sections.
  9. 9. The double-core separated solid-state transformer according to claim 2, characterized in that the outer walls of the primary side frame (2) and the secondary side frame (5) are provided with axial heat dissipation grooves.
  10. 10. A dual-core split solid-state transformer according to claim 2, characterized in that the primary core (3) and the secondary core (6) are symmetrically mounted in the same horizontal plane, sharing a mechanical support base.
  11. 11. A dual-core split solid state transformer according to claim 2, wherein the transformer is formed by a plurality of primary sides and a plurality of secondary sides together to form a combined transformer module, and wherein the combined transformer module may share an insulation module.

Description

Double-core separated solid-state transformer Technical Field The invention belongs to the technical field of power electronic conversion and high-frequency isolation transformers, and particularly relates to a solid-state transformer based on a double-magnetic-core separation structure. Background The solid-state transformer is a core 'energy router' of a novel power system, and compared with a traditional power frequency transformer, the solid-state transformer has four advantages of high-frequency isolation, high efficiency, energy conservation, intelligent regulation and control and bidirectional flow, and is suitable for large-scale landing in key scenes such as an AI data center, new energy grid connection, intelligent micro-grid, super-charging stations, rail transit and the like. The existing high-frequency high-voltage transformer generally adopts a single magnetic core structure matched with an inner layer winding and an outer layer winding, namely, a primary side winding and a secondary side winding are coaxially wound on the same framework, and an inner layer winding is covered by the outer layer winding and the magnetic core structure. The structure causes long heat conduction path of the inner layer winding and high heat resistance, and local high temperature points are easy to form under the working condition of high frequency and high current, so that the power density is seriously restricted to be improved and the long-term operation reliability is seriously restricted. Meanwhile, in order to meet the high-voltage electric insulation requirement, the prior art relies on a fully encapsulated epoxy resin process to seal and solidify the whole transformer module, and although the high insulation strength can be realized, the epoxy resin has low heat conductivity coefficient, so that the conduction of heat of a winding and a magnetic core to the external environment is obviously hindered, the overall temperature rise is overhigh, the aging of insulating materials is accelerated, and the working efficiency and the service life of the device are reduced Disclosure of Invention A double-core separated solid-state transformer comprises a primary winding module, a secondary winding module and a middle isolation module. The primary winding module and the secondary winding module are arranged oppositely, and the middle isolation module is positioned between the primary winding module and the secondary winding module. The primary winding module is formed by uniformly winding primary windings on a primary framework and sleeving a primary magnetic core, and the secondary winding module is formed by uniformly winding secondary windings on a secondary framework and sleeving a secondary magnetic core; Preferably, the middle isolation module is an isolation plate made of high-performance insulating materials such as polyimide, epoxy resin or polytetrafluoroethylene, the thickness of the isolation plate is 0.5-10.0 mm, and high-voltage electrical isolation between primary and secondary sides is achieved. Preferably, the primary winding and the secondary winding are respectively and electrically connected with the power electronic conversion circuit, and signals and energy pass through the isolation region through magnetic coupling to realize high-frequency isolation transmission. The primary and secondary windings are respectively positioned on the independent magnetic cores, so that the traditional inner and outer nested structures are eliminated, the heat resistance of the inner coil is obviously reduced, heat is easier to be emitted from the side frameworks and the surfaces of the magnetic cores, the use of fully-encapsulated epoxy resin is avoided, and the overall heat dissipation efficiency is greatly improved. The design structurally realizes the optimization and electrical isolation decoupling of the heat dissipation path, and compared with the traditional fully-encapsulated encapsulation structure, the scheme improves the temperature rise consistency in the aspect of operation stability, simplifies the maintenance and module replacement process in the aspect of use convenience, and enhances the pressure-resistant reliability in the aspect of safety through physical isolation, thereby improving the working performance and the service life and being beneficial to the cost control of the system. Preferably, the primary side magnetic core and the secondary side magnetic core are respectively in various types such as E type, U type, PQ type, PM type or RM type; Preferably, the end face of the central column of the magnetic core is attached to the isolation plate in parallel, so that the magnetic core can be tightly cut, a certain gap can be reserved, and the attaching gap is controlled within the range of 0.1-0.5 mm; Preferably, the bonding gap is filled with heat-conducting silicone grease; By limiting the type of the magnetic core and the contact interface parameters, the continuity of the magnetic circu