High-efficiency and high-frequency integrated plug-in mounting vehicle-mounted transformer

Abstract

A high-efficiency and high-frequency integrated plug-in mounting vehicle-mounted transformer relates to the technical field of vehicle-mounted transformers, and adopts the technical scheme that the high-efficiency and high-frequency integrated plug-in mounting vehicle-mounted transformer comprises a magnetic core, a framework and a winding, the magnetic core is square-shaped, and the magnetic core comprises two magnetic columns; the framework comprises two frameworks, a plurality of partition plates are arranged on the frameworks in the axial direction, a winding groove is defined by every two adjacent partition plates, the widths of the multiple winding grooves in each framework are different, and the widths of the multiple winding grooves in the two frameworks are different. The windings comprise primary windings and secondary windings, and the primary windings and the secondary windings are wound on each framework at intervals. According to the utility model, the leakage inductor is used as the resonant inductor, additional inductance windings are not needed, and the volume and the occupied area are reduced; a plurality of winding grooves, sub-grooves and asymmetrically-wound windings with different widths are arranged on the framework, so that coupling of primary and secondary windings can be effectively controlled and primary and secondary coupling capacitance can be reduced under the condition that leakage inductance, namely resonant inductance, is fixed; and the use frequency range is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted transformer technology, and in particular to a high-efficiency, high-frequency integrated plug-in vehicle-mounted transformer. Background Technology

[0002] Traditional on-board chargers (OBCs) typically include a transformer and a resonant inductor. The resonant inductor is either independent or externally connected to the transformer, sharing the back of the transformer core. This results in a large board area, poor heat dissipation, and a relatively low operating frequency range (60kHz~180kHz) in current designs. With advancements in power supply design, traditional circuits no longer meet the requirements for miniaturization, high efficiency, and low cost. Utility Model Content

[0003] To address the problems of large board area, narrow operating frequency range, and poor heat dissipation in existing technical solutions, this utility model provides a high-efficiency, high-frequency integrated plug-in vehicle-mounted transformer.

[0004] This utility model provides the following technical solution: a high-efficiency, high-frequency integrated plug-in vehicle-mounted transformer, comprising:

[0005] A magnetic core, wherein the magnetic core is U-shaped and comprises two magnetic pillars;

[0006] The skeleton includes two skeletons respectively fitted around the two magnetic pillars. The skeleton is provided with multiple partitions along the axial direction. Two adjacent partitions form a winding groove. The width of the multiple winding grooves on each skeleton is different, and the width of the multiple winding grooves on the two skeletons is different.

[0007] The winding includes a primary winding and a secondary winding. Each winding slot is wound with either the primary winding or the secondary winding, and the primary winding and the secondary winding are wound at intervals on each frame.

[0008] Preferably, the magnetic core is a UU magnetic core, and the UU magnetic cores are connected in a square shape.

[0009] Preferably, the magnetic core is made of JNP97 manganese-zinc ferrite material.

[0010] Preferably, the magnetic column has at least one air gap along the axial direction, and the air gap is filled with a heat sink.

[0011] Preferably, the frame is provided with a heat dissipation channel on the side facing the magnetic column, the heat dissipation channel extends along the axial direction of the frame and forms an opening on the side wall of the frame; the heat dissipation channel is filled with thermally conductive adhesive.

[0012] Preferably, the skeleton is provided with a reinforcing rib on the side facing the magnetic post, and the reinforcing rib extends along the axial direction of the skeleton.

[0013] The beneficial effects of this invention are: using leakage inductance as the resonant inductor eliminates the need for additional inductor windings, reducing volume and board area; by setting multiple winding slots of different widths on the frame, and using slotted, asymmetrical windings, the coupling between the primary and secondary windings can be effectively controlled and the coupling capacitance between the primary and secondary windings can be reduced, given a fixed leakage inductance, i.e., resonant inductance; the operating frequency range is increased to 150kHz~450kHz; and the internal heat of the magnetic core is dissipated through heat sinks and thermally conductive adhesive, effectively controlling the temperature rise. Attached Figure Description

[0014] Figure 1 This is a top view of one embodiment of a transformer.

[0015] Figure 2 This is a side view of one embodiment of a transformer.

[0016] Figure 3 This is a schematic diagram of one embodiment of the magnetic core.

[0017] Figure 4 This is a schematic diagram of one embodiment of the skeleton and winding.

[0018] Reference numerals: 10-Magnetic core, 11-Magnetic column, 12-Heat sink, 21-First frame, 22-Second frame, 23-Baffle, 24-Heat dissipation channel, 25-Opening, 31-Primary winding, 32-Secondary winding. Detailed Implementation

[0019] The embodiments of this utility model will be described in more detail below with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement them after reading this specification. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0020] This utility model provides, for example Figure 1-4 The diagram shows a high-efficiency, high-frequency integrated plug-in vehicle transformer, including a magnetic core 10, a frame, and windings wound on the frame.

[0021] The magnetic core 10 can be a UU magnetic core, with the UU cores spliced ​​together in a U-shape to form a closed magnetic circuit. A window is provided in the middle, and two magnetic pillars 11 are respectively arranged on both sides of the window. The magnetic core 10 uses JNP97 manganese-zinc ferrite, with an operating frequency range of 150kHz~450kHz, which is a significant improvement compared to conventional designs. Each magnetic pillar 11 has at least one air gap along the axial direction, and the air gap is filled with a heat sink 12 to facilitate rapid heat dissipation, reduce transformer temperature rise, and improve efficiency.

[0022] The skeleton includes two skeletons respectively fitted around the two magnetic posts 11, namely the first skeleton 21 and the second skeleton 22.

[0023] The first frame 21 has five partitions 23 arranged along the axial direction. Two adjacent partitions 23 form a winding slot. The first frame 21 has a total of four winding slots. Each winding slot is wound with a primary winding or a secondary winding. The primary and secondary windings are wound alternately. Figure 1 As shown, the four winding slots are wound with primary winding 31, secondary winding 32, primary winding 31 and secondary winding 32 in sequence from right to left. The width of each winding slot is different, and the number of winding turns and wire diameter that can be accommodated can be adjusted according to actual needs.

[0024] The second frame 22 has eight partitions 23 arranged along the axial direction, dividing the second frame 22 into seven winding grooves, such as... Figure 1 As shown, the seven winding slots, from left to right, are wound with primary winding 31, secondary winding 32, primary winding 31, secondary winding 32, primary winding 31, secondary winding 32, and primary winding 31 again. Each winding slot has a different width, and the number of turns and wire diameter it can accommodate can be adjusted according to actual needs. Furthermore, the widths of multiple winding slots on the first and second frames are also different, achieving asymmetrical winding.

[0025] Magnetic lines of force passing through the gap between the primary and secondary windings create leakage inductance, which can be equivalent to a resonant inductance. Therefore, there is no need to set up additional inductor windings, reducing volume and board area. By using a bobbin-style slotted winding, the coupling between the primary and secondary windings can be effectively controlled while maintaining a certain leakage inductance (i.e., resonant inductance), thus reducing the coupling capacitance between the primary and secondary windings. This can, to some extent, overcome the long-standing problem in conventional designs where high leakage inductance leads to low coupling capacitance, and vice versa.

[0026] Both the primary and secondary windings can use film-wrapped wire. The two ends of multiple windings are led out through stranded wire leads, and the primary winding can use wire with a larger cross-sectional area to increase its current carrying capacity, thereby reducing volume and cost.

[0027] The frame has multiple heat dissipation slots 24 on the side facing the magnetic column. The heat dissipation slots 24 extend along the axial direction of the first frame 21 and the second frame 22 and form openings 25 on the side walls of the first frame 21 and the second frame 22. The heat dissipation slots 24 are filled with thermally conductive adhesive to wrap the magnetic core, and are connected to the inside of the winding through the openings 25, so as to facilitate the dissipation of heat inside the transformer and control the temperature rise.

[0028] The skeleton is also provided with a reinforcing rib 26 on the side facing the magnetic column. At least one reinforcing rib 26 extends along the axial direction of the first and second skeletons to increase the distance between the coil and the magnetic core.

[0029] The above describes one or more embodiments of this utility model in a relatively specific and detailed manner, but it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An integrated plug-in on-board transformer for high efficiency and high frequency, characterized by, The application relates to a UU magnetic core and a winding structure thereof. The magnetic core is in the shape of a mouth character, and comprises two magnetic columns. The framework comprises two frameworks which are sleeved on the two magnetic columns respectively, and the framework is provided with a plurality of partitions in the axial direction, and two adjacent partitions form a winding slot, the widths of the plurality of winding slots on each framework are different, and the widths of the plurality of winding slots on the two frameworks are different. The winding comprises a primary winding and a secondary winding, each winding slot is wound with the primary winding or the secondary winding, and the primary winding and the secondary winding on each framework are wound at intervals.

2. The integrated plug-in on-board transformer for high efficiency and high frequency according to claim 1, characterized in that, The magnetic core is a UU magnetic core, and the UU magnetic core is connected in the shape of a mouth character.

3. The integrated plug-in on-board transformer for high efficiency and high frequency according to claim 1, characterized in that, The magnetic core is made of JNP97 manganese-zinc ferrite material.

4. The integrated plug-in on-board transformer for high efficiency and high frequency according to claim 1, characterized in that, The magnetic column is provided with at least one air gap in the axial direction, and the air gap is filled with radiating fins.

5. The integrated plug-in on-board transformer for high efficiency and high frequency as claimed in claim 1 wherein, The framework is provided with a radiating through slot on the side of the magnetic column, the radiating through slot extends along the axial direction of the framework and forms an opening on the side wall of the framework, and the radiating through slot is filled with heat-conducting glue.

6. The integrated plug-in on-board transformer for high efficiency and high frequency as claimed in claim 1 wherein, The framework is provided with a reinforcing rib on the side of the magnetic column, and the reinforcing rib extends along the axial direction of the framework.

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