CN215955020U - Transformer and vehicle-mounted power supply applicable to same - Google Patents

Abstract

The present disclosure provides a transformer and a vehicle-mounted power supply suitable for the same, wherein the transformer comprises at least one primary winding and at least one secondary winding. Each primary winding comprises three layers of insulated wires and adhesive tapes, and each adhesive tape is provided with a first contact surface and a second contact surface which are opposite. The rubberized fabric spiral winding is on three-layer insulated wire, and first contact surface contacts with three-layer insulated wire, and the second contact surface has viscidity. And the secondary winding is attached to the adjacent primary winding through the viscosity of the second contact surface of the adhesive tape, wherein the heat exchange is carried out between the attached primary winding and the secondary winding.

Description

Transformer and vehicle-mounted power supply applicable to same

Technical Field

The disclosure relates to the technical field of power electronics, in particular to a transformer and a vehicle-mounted power supply applicable to the transformer.

Background

In the development of the vehicle power supply, liquid cooling heat dissipation (e.g., water cooling heat dissipation) is a common and efficient method. However, water-cooling heat dissipation requires a series of heat transfer processes to transfer heat energy from the heating element to the water medium, for example, heat energy is transferred from a magnetic element (one of the main heating elements of the vehicle-mounted power supply) to the water medium sequentially through the heat dissipation glue, the glue filling cavity, the cold plate, and the pipe wall of the water pipe, and finally the heat energy is taken away by the water medium.

The magnetic element is mainly, but not limited to, a transformer. A conventional transformer includes an iron core, a bobbin, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are electrically connected to a high-voltage battery and a low-voltage battery, respectively, and the primary winding and the secondary winding are main heating components. The winding framework is used for winding the winding so as to facilitate production and assembly. However, the bobbin occupies a limited transformer winding space, resulting in a reduced power density of the transformer. Moreover, because the blades of the bobbin are arranged between the primary winding and the secondary winding at intervals, heat energy generated by the primary winding is difficult to transfer to the secondary winding, and under the condition that the secondary winding integrates the heat dissipation effect, the further improvement of the heat balance of the transformer is difficult.

Therefore, how to develop a transformer and a vehicle-mounted power supply thereof, which can improve the above prior art, is an urgent need.

Disclosure of Invention

The purpose of the disclosure is to provide a transformer and a vehicle-mounted power supply suitable for the same, in the transformer, through the viscosity of the adhesive tape of the primary winding, the primary winding is bonded into a whole, a winding framework is cancelled, and the primary winding and the secondary winding are directly attached to each other and perform heat exchange. Therefore, the power density of the transformer can be effectively improved, and the heat conduction between the primary winding and the secondary winding is enhanced to improve the heat balance.

To achieve the above objective, the present disclosure provides a transformer including at least one primary winding and at least one secondary winding. Each primary winding comprises three layers of insulated wires and adhesive tapes, and each adhesive tape is provided with a first contact surface and a second contact surface which are opposite. The rubberized fabric spiral winding is on three-layer insulated wire, and first contact surface contacts with three-layer insulated wire, and the second contact surface has viscidity. And the secondary winding is attached to the adjacent primary winding through the viscosity of the second contact surface of the adhesive tape, wherein the heat exchange is carried out between the attached primary winding and the secondary winding.

In some embodiments, the transformer is disposed in the cavity, the gap between the transformer and the cavity is filled with a heat dissipation adhesive, and the secondary winding is at least partially in contact with the heat dissipation adhesive, so that heat generated by the primary winding is transferred to the cavity through the contact secondary winding and the heat dissipation adhesive.

In some embodiments, the cavity is made of metal.

In some embodiments, at least one secondary winding has a heat dissipation extension for increasing the heat dissipation area of the secondary winding.

In some embodiments, the secondary winding is a copper coil winding.

In some embodiments, the secondary winding has a flange at an end opposite the outlet end thereof, the flange for increasing the heat dissipation area of the secondary winding.

In some embodiments, the number of primary windings is N, the number of secondary windings is N +1, N is a positive integer, and the N primary windings are interleaved with the N +1 secondary windings.

In some embodiments, the N primary windings have the same number of turns.

In some embodiments, the N primary windings are connected in parallel.

In some embodiments, the first contact surface of the adhesive has adhesive properties.

To achieve the above object, the present disclosure further provides a vehicle power supply including any one of the transformers described above.

Drawings

Fig. 1 is a schematic perspective view of a transformer and a cavity according to an embodiment of the disclosure.

Fig. 2 is a schematic cross-sectional view of the transformer and the cavity of fig. 1 along a plane AA'.

Fig. 3 is an exploded view of the transformer and the cavity of fig. 1.

Fig. 4 illustrates the wires and tapes of the primary winding of fig. 3.

Fig. 5 is a schematic circuit diagram of a vehicle power supply according to an embodiment of the disclosure.

Fig. 6 illustrates a heat dissipation structure of a transformer in a vehicle power supply.

Description of reference numerals:

1: transformer device

11: primary winding

111: three-layer insulated wire

112: adhesive plaster

113: first contact surface

114: second contact surface

115: opening of primary winding

12: secondary winding

121: wire outlet terminal

122: edge folding

123: opening of secondary winding

13: iron core

2: cavity body

21: heat dissipation glue

3: cover plate

31: perforation

4: vehicle-mounted power supply

41: primary side circuit

42: secondary side circuit

Vin, Vo: voltage of

5: heat radiation cold plate

51: water medium pipe

Detailed Description

Some exemplary embodiments that incorporate the features and advantages of the present disclosure will be described in detail in the specification which follows. It is to be understood that the disclosure is capable of various modifications in various embodiments without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

Fig. 1 is a schematic perspective view of a transformer and a cavity according to an embodiment of the disclosure, fig. 2 is a schematic cross-sectional view of the transformer and the cavity of fig. 1 along a plane AA', fig. 3 is a schematic exploded view of the transformer and the cavity of fig. 1, and fig. 4 illustrates a lead and a tape of a primary winding of fig. 3. As shown in fig. 1, 2, 3 and 4, the transformer 1 includes at least one primary winding 11 and at least one secondary winding 12. Each primary winding 11 includes a conductive wire and an adhesive tape 112, wherein the conductive wire is preferably, but not limited to, a triple-layer insulated wire 111, and the triple-layer insulated wire 111 is referred to as the conductive wire in the following description. In each primary winding 11, the tape 112 has a first contact surface 113 and a second contact surface 114 which are opposite to each other, the tape 112 is spirally wound on the three-layer insulated wire 111, the first contact surface 113 of the tape 112 is in contact with the three-layer insulated wire 111, and the second contact surface 114 of the tape 112 has adhesiveness. Each primary winding 11 is bonded into a whole by the viscosity of the second contact surface 114 of the adhesive tape 112, and each secondary winding 12 is attached to the adjacent primary winding 11, wherein heat exchange can be performed between the attached primary winding 11 and the attached secondary winding 12. In some embodiments, the first contact surface 113 of the adhesive 112 also has adhesive properties, which facilitate the winding and adhering of the adhesive 112 onto the three-layer insulated wire 111.

Therefore, in the transformer 1 of the present disclosure, the winding frame of the existing transformer is eliminated, the power density of the transformer can be effectively improved, and in addition, the primary winding 11 is directly attached to the adjacent secondary winding 12, which is beneficial to realizing the heat conduction between the primary winding 11 and the secondary winding 12, and further improving the overall heat balance of the transformer 1. For example, compared to the conventional transformer having a bobbin, the transformer 1 of the present disclosure has a smaller volume and weight and is easier to dissipate heat under the condition of providing the same power; and under the condition that the volume and the weight of the transformer are the same, the transformer 1 of the present disclosure has stronger power processing capability.

In addition, the safety distance between the three-layer insulated wire 111 of the primary winding 11 and the secondary winding 12 can be achieved by adjusting the overlapping ratio or the loop length of the tape 112 to meet the safety regulations. In addition, the three-layer insulated wire 111 has a certain insulation function, and in some embodiments, the tape 112 has insulation, so as to further enhance the insulation strength of the transformer 1.

As shown in fig. 1, 2 and 3, in some embodiments, the transformer 1 is disposed in the cavity 2, and the material of the cavity 2 may be, for example, but not limited to, a metal such as aluminum alloy or copper. The gap between the transformer 1 and the cavity 2 is filled with heat dissipation glue 21, and at least part of the secondary winding 12 contacts with the heat dissipation glue 21. Because the secondary winding 12 has thermal conductivity, the heat generated by the primary winding 11 can be transmitted to the cavity 2 through the secondary winding 12 and the heat dissipation glue 21 which are in contact with each other.

In some embodiments, the secondary winding 12 has a heat dissipation extension, wherein the heat dissipation extension is disposed on the periphery of the secondary winding 12, for example, the heat dissipation extension is disposed at the edge of the secondary winding 12 close to the inner sidewall of the cavity 2, for example, the heat dissipation extension is in contact with the inner sidewall of the cavity 2, so as to increase the heat dissipation area of the secondary winding 12, thereby enhancing the heat dissipation. Furthermore, in the case where the heat dissipation paste 21 is filled in the gap between the transformer 1 and the cavity 2, the heat dissipation extension may increase the contact area between the secondary winding 12 and the heat dissipation paste 21, thereby enhancing heat dissipation.

In some embodiments, the secondary winding 12 is a copper coil winding that can withstand high currents. The secondary winding 12 has an outlet end 121, and an end of the secondary winding 12 opposite to the outlet end 121 has an L-shaped folded edge 122, where the folded edge 122 is an embodiment of the aforementioned heat dissipating extension body, and is used to increase the heat dissipating area of the secondary winding 12, so as to enhance heat dissipation. In the case where the secondary winding 12 is a copper coil winding, the number of the primary windings 11 is N, the number of the secondary windings 12 is N +1, and the primary windings 11 and the secondary windings 12 are alternately arranged in the manner shown in fig. 3, where N is a positive integer. In some embodiments, the N primary windings 11 have the same number of turns and are connected in parallel with each other.

In some embodiments, the primary winding 11 and the secondary winding 12 of the transformer 1 are provided with a cover plate 3 for shielding and preventing accidental touch, and the cover plate 3 further has a plurality of through holes 31 for the outlet ends 121 of the secondary winding 12 to pass through. In addition, based on the design consideration that the common magnetic circuit has no air gap, the core 13 of the transformer 1 can be implemented by, for example and without limitation, an EIE or EEI structure, and correspondingly, the centers of the primary winding 11 and the secondary winding 12 respectively have openings 115 and 123 for the core 13 to penetrate through.

The transformer of the present disclosure may be applied to a vehicle power supply. Fig. 5 is a schematic circuit diagram of a vehicle power supply according to an embodiment of the disclosure. As shown in fig. 5, the vehicle-mounted power supply 4 includes a primary circuit 41, a transformer 1, and a secondary circuit 42 electrically connected in this order. The primary circuit 41 may be, for example, but not limited to, a full-bridge circuit or a half-bridge circuit, and the secondary circuit 42 may be, for example, but not limited to, a full-wave rectifier circuit or a full-bridge rectifier circuit. The primary winding 11 and the secondary winding 12 of the transformer 1 are electrically connected to the primary circuit 41 and the secondary circuit 42, respectively. The primary circuit 41 receives input electric energy from the vehicle-mounted high-voltage battery, wherein the voltage Vin of the input electric energy is higher, and the current is lower. After the conversion by the transformer 1, the secondary circuit 42 provides the output power to the low-voltage battery, wherein the voltage Vo of the output power is lower and the current is higher.

Fig. 6 illustrates a heat dissipation structure of a transformer in a vehicle power supply. As shown in fig. 6, taking water cooling as an example, the transformer 1 is disposed in the cavity 2, the heat dissipation glue 21 is filled between the transformer 1 and the cavity 2, the cavity 2 is disposed on the heat dissipation cold plate 5 and contacts with the heat dissipation cold plate, and the heat dissipation cold plate 5 is disposed with the water medium pipe 51 for the water medium to flow through. Therefore, the heat generated by the transformer 1 is transferred to the water medium through the heat dissipation glue 21, the cavity 2, the heat dissipation cold plate 5 and the pipe wall of the water medium pipe 51 in sequence, and the heat is taken away by the flow of the water medium to complete the heat dissipation.

In summary, the present disclosure provides a transformer and a vehicle-mounted power supply using the same, in which a primary winding is directly attached to an adjacent secondary winding, so as to effectively increase power density, and enhance heat conduction between the primary winding and the secondary winding, thereby improving the overall thermal balance of the transformer. In addition, the heat dissipation efficiency of the transformer can be further improved by filling the heat dissipation glue in the gap between the transformer and the cavity and/or arranging the heat dissipation extension body at the periphery of the secondary winding. In addition, the primary winding adopts a structure that the adhesive tapes are coated outside the three layers of insulated wires, and the three layers of insulated wires have certain insulation function, and in some embodiments, the adhesive tapes also have insulation property, so that the insulation capacity of the transformer can be further enhanced.

It should be noted that the above-mentioned embodiments illustrate only preferred embodiments of the disclosure, and the disclosure is not limited to the described embodiments, as the scope of the disclosure is determined by the claims. And that the disclosure may be modified in various ways by anyone skilled in the art without departing from the scope of protection of the claims.

Claims (11)

1. A transformer, comprising:

the primary winding comprises three layers of insulated wires and an adhesive tape, the adhesive tape is provided with a first contact surface and a second contact surface which are opposite, the adhesive tape is spirally wound on the three layers of insulated wires, the first contact surface is contacted with the three layers of insulated wires, and the second contact surface has viscosity; and

and at least one secondary winding which is attached to the adjacent primary winding through the viscosity of the second contact surface of the adhesive tape, wherein the heat exchange is carried out between the attached primary winding and the attached secondary winding.

2. The transformer of claim 1, wherein the transformer is disposed in a cavity, a gap between the transformer and the cavity is filled with a heat-dissipating glue, and the secondary winding at least partially contacts the heat-dissipating glue, such that heat generated by the primary winding is transferred to the cavity via the contact of the secondary winding and the heat-dissipating glue.

3. The transformer of claim 2, wherein the cavity is made of metal.

4. The transformer of claim 1, wherein at least one of the secondary windings has a heat dissipating extension for increasing a heat dissipating area of the secondary winding.

5. The transformer of claim 1, wherein the secondary winding is a copper coil winding.

6. The transformer of claim 5, wherein the secondary winding has a flange at an end opposite to the outlet end thereof, the flange being adapted to increase a heat dissipation area of the secondary winding.

7. The transformer of claim 5, wherein the number of primary windings is N, the number of secondary windings is N +1, N is a positive integer, and the N primary windings are interleaved with the N +1 secondary windings.

8. The transformer of claim 7, wherein the N primary windings have the same number of turns.

9. The transformer of claim 8, wherein the N primary windings are connected in parallel.

10. The transformer of claim 1, wherein the first contact surface has an adhesive property.

11. A vehicle power supply, characterized by comprising a transformer according to any one of claims 1-10.

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