CN217333815U - High-frequency transformer suitable for high-power high-voltage power supply module - Google Patents
High-frequency transformer suitable for high-power high-voltage power supply module Download PDFInfo
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- CN217333815U CN217333815U CN202220843519.6U CN202220843519U CN217333815U CN 217333815 U CN217333815 U CN 217333815U CN 202220843519 U CN202220843519 U CN 202220843519U CN 217333815 U CN217333815 U CN 217333815U
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Abstract
The utility model provides a high-frequency transformer suitable for high-power high voltage power supply module, include: an iron core; a coil disposed around the core and including a plurality of low voltage windings and a plurality of high voltage windings, wherein the low voltage windings are connected in parallel and the high voltage windings are connected in series; and the heat dissipation assembly comprises a bottom plate and an outer frame, wherein the bottom plate is a water cooling plate with a groove formed in the surface, the lower port of the outer frame is embedded in the groove, the coil is arranged in the outer frame, and the outer frame is filled with pouring sealant. The utility model has the advantages that: the low-voltage winding and the high-voltage winding are formed by connecting a plurality of windings, the coupling degree of the coil structure is high, and the leakage inductance of the transformer is greatly reduced; the periphery of the coil is filled and wrapped by pouring sealant, so that the insulating property is improved; the water cooling plate is used for heat dissipation, the heat dissipation performance is excellent, the size of an iron core and a coil of the high-frequency transformer is reduced, and the power density of the high-frequency transformer is improved.
Description
Technical Field
The utility model relates to a transformer equipment technical field especially relates to a high-frequency transformer suitable for high-power high voltage power supply module.
Background
With the continuous progress of products in the power electronic application field in the technical level and the manufacturing process, higher requirements are continuously provided for the performance indexes of the power module. For example, higher power densities are provided to accommodate more compact installation spaces.
In the power module, a high-frequency transformer is an essential part, which realizes the storage and transmission of energy, and is used for isolation and transformation, and the performance of the high-frequency transformer not only directly influences whether the output generates waveform distortion and the efficiency of energy transmission, but also can influence the safe operation of a power switch device. When the power module is in a hundreds kilowatt level high-power and thousands volt high-voltage output field, the high-voltage coil, the low-voltage coil and the iron core of the high-frequency transformer need effective insulation thickness or distance to avoid electric field breakdown, and the traditional low-voltage transformer cannot be generally distributed in a whole layer due to large sectional area and few turns of a low-voltage winding lead, so that parasitic leakage inductance is increased, and the performance index of the power module is influenced; in addition, the traditional low-voltage transformer radiates heat in a self-cooling or air-cooling radiating mode, the radiating effect is poor, and the size of the transformer needs to be designed greatly under the condition of meeting the temperature rise index.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problem that the leakage inductance that traditional low voltage transformer was applied to power module and produced is big, bulky, the radiating effect is poor, the embodiment of the utility model provides a high frequency transformer suitable for high-power high voltage power module.
An embodiment of the utility model provides a high-frequency transformer suitable for high-power high voltage power supply module, include:
an iron core;
a coil disposed around the core and including a plurality of low voltage windings and a plurality of high voltage windings, wherein the low voltage windings are connected in parallel and the high voltage windings are connected in series;
and the heat dissipation assembly comprises a bottom plate and an outer frame, wherein the bottom plate is a water cooling plate with a groove formed in the surface, the lower port of the outer frame is embedded in the groove, the coil is arranged in the outer frame, and the outer frame is filled with pouring sealant.
Furthermore, a plurality of cushion blocks are arranged on the inner wall of the outer frame, and the lower parts of the coils are supported on the cushion blocks to be separated from the bottom plate.
Further, the cushion block is a ceramic cushion block.
The coil is arranged in the center of the coil in a penetrating mode, the insulating tubes are arranged around the coil, a plurality of threaded connectors are arranged on the pressing plate, each threaded connector penetrates through the positioning rod or the insulating tube and is connected with the bottom of the groove, and therefore the pressing plate covers the upper port of the outer frame.
Furthermore, the outer frame is a rectangular frame, the number of the insulation pipes is four, and the four insulation pipes are respectively arranged at four corners of the outer frame.
Furthermore, a high-voltage lead terminal and a low-voltage lead terminal are respectively arranged on two opposite sides of the coil, and an avoidance gap is formed in the portion, close to the high-voltage lead terminal and the low-voltage lead terminal, of the pressing plate.
Furthermore, the lower port of the outer frame is embedded into the groove and connected through a fastening screw, and an adhesive is filled between the lower port of the outer frame and the groove.
Further, the water-cooling plate is a red copper water-cooling plate.
Further, the wires of the low-voltage winding and the high-voltage winding are both multi-strand litz wires, and polyimide adhesive tapes are wound on the outer surfaces of the multi-strand litz wires.
Furthermore, the pouring sealant is a high-thermal-conductivity pouring sealant with the thermal conductivity coefficient of more than or equal to 1.8W/m.K.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the high-frequency transformer applicable to the high-power high-voltage power supply module of the utility model has the advantages that the low-voltage winding and the high-voltage winding are formed by connecting a plurality of windings, the coupling degree of the coil structure is high, and the leakage inductance of the transformer is greatly reduced; the periphery of the coil is filled and wrapped by pouring sealant, so that the insulating property is improved; the water cooling plate is used for heat dissipation, so that the heat dissipation performance is excellent, the volumes of an iron core and a coil of the high-frequency transformer are reduced, and the power density of the high-frequency transformer is improved; the outer surface of the heat dissipation component can be used for installing other power devices in the high-power high-voltage power supply module, and the space utilization rate of the power supply module is improved.
Drawings
Fig. 1 is an exploded view of a high frequency transformer suitable for a high power high voltage power supply module of the present invention;
FIG. 2 is a cross-sectional view of the coil of FIG. 1;
FIG. 3 is a schematic diagram of the internal wiring of the coil of FIG. 1;
fig. 4 is a schematic view of the heat sink assembly of fig. 1.
In the figure: 1-iron core, 2-coil, 21-low voltage winding, 211-low voltage winding start, 212-low voltage winding tail end, 22-high voltage winding, 221-high voltage winding start, 222-high voltage winding tail end, 23-low voltage lead terminal, 24-high voltage lead terminal, 3-heat dissipation component, 31-bottom plate, 311-threaded hole, 312-groove, 313-screw hole, 32-outer frame, 33-fastening screw, 4-cushion block, 5-positioning rod, 6-pressing plate, 7-insulating tube and 8-threaded connecting piece.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings. The following description is of the preferred embodiment of the invention in its various possible embodiments and is intended to provide a basic understanding of the invention and not to identify key or critical elements of the invention or to delineate the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a high-frequency transformer suitable for a high-power high-voltage power module, mainly corresponding to the power module, the high-frequency transformer mainly includes an iron core 1, a coil 2, a heat dissipation assembly 3, a pressing plate 6, a positioning rod 5, and a plurality of insulating tubes 7.
As shown in fig. 2, the coil 2 is disposed around the iron core 1, the coil 2 includes a plurality of low voltage windings 21 and a plurality of high voltage windings 22, and the high voltage windings 22 and the low voltage windings 21 are disposed at intervals from inside to outside. As shown in fig. 3, the low-voltage windings 21 are connected in parallel, and the high-voltage windings 22 are connected in series. Specifically, in this embodiment, the number of the low voltage windings 21 is two, and the number of the high voltage windings 22 is three, wherein two of the low voltage winding start ends 211 are merged and connected to be welded with one low voltage lead terminal 23, and two of the low voltage winding end ends 212 are merged and connected to be welded with the other low voltage lead terminal 23. The beginning 221 and the end 222 of the high-voltage winding 22 are connected in sequence, and the unconnected beginning 221 and end 222 are respectively welded with the two high-voltage lead terminals 24.
Preferably, the wires of the low voltage winding 21 and the high voltage winding 22 are multi-strand litz wires, the outer surfaces of the multi-strand litz wires are wound with polyimide tapes, and the low voltage winding 21 and the high voltage winding 22 are wound by three-quarter-lap winding.
The heat dissipation assembly 3 includes a bottom plate 31 and an outer frame 32, wherein the bottom plate 31 is a water-cooling plate with a groove 312 on the surface, and a lower port of the outer frame 32 is embedded in the groove 312. As shown in fig. 4, the groove 312 is a rectangle and is recessed downward relative to the surface of the bottom plate 31, and preferably, the bottom plate 31 is a red copper water cooling plate, and heat is dissipated by a water cooling heat dissipation manner. The outer frame 32 is a rectangular frame, and the shape of the outer frame is matched with the groove 312, so that the lower port of the outer frame can be just embedded into the groove 312. It will be understood by those skilled in the art that the outer frame 32 can be flexibly configured into other shapes according to application scenarios, such as a cylinder, other polygons, etc., and the shape of the groove 312 is designed according to the shape of the lower port of the outer frame 32.
Further, the lower port of the outer frame 32 is fixedly connected with the groove 312, and the connection position is sealed. In this embodiment, the lower port of the outer frame 32 is inserted into the groove 312 and connected by the fastening screw 33, and the adhesive is filled between the lower port of the outer frame 32 and the groove 312, so that the gap between the lower port of the outer frame 32 and the groove 312 is sealed by the adhesive. Preferably, each side surface of the outer frame 32 is designed as a vacuum cavity temperature equalizing plate, so that the heat dissipation capability around the outer frame can be improved.
The coil 2 is arranged in the outer frame 32, and the outer frame 32 is filled with pouring sealant. As shown in fig. 1, the inner wall of the outer frame 32 is provided with a plurality of spacers 4, and the lower portion of the coil 2 is supported on each of the spacers 4 to be separated from the bottom plate 31. In this embodiment, the number of the cushion blocks 4 is three, the cushion blocks 4 surround the inner wall of the outer frame, and the bottom of the coil 2 is stably supported on each cushion block 4. Preferably, the cushion block 4 is a ceramic cushion block. The heat conduction efficiency can be improved while the insulation distance between the coil 2 and the bottom plate 31 is satisfied.
After the coils 2 are placed on the cushion blocks 4, pouring sealant is poured into the outer frame 32, and the coils 2 are wrapped by the pouring sealant in a curing mode. Preferably, the pouring sealant is a high-thermal-conductivity pouring sealant with the thermal conductivity coefficient of more than or equal to 1.8W/m.K, so that the pouring sealant has better thermal conductivity, and further improves the heat exchange efficiency.
As shown in fig. 1, the positioning rod 5 is disposed in the center of the coil 2, the insulating tubes 7 are disposed around the coil 2, the pressing plate 6 is provided with a plurality of threaded connectors 8, and each threaded connector 8 penetrates through the positioning rod 5 or the insulating tube 7 and is connected to the bottom of the groove 312, so that the pressing plate 6 covers the upper port of the outer frame 32. In this embodiment, the number of the insulating tubes 7 is four, four insulating tubes 7 are respectively disposed at four corners of the outer frame 32, the threaded connector 8 is a screw rod, and the screw rod sequentially penetrates through the pressing plate 6, the insulating tubes 7 or the positioning rod 5 from the upper portion of the pressing plate 6, and then is in threaded connection with the threaded hole on the groove 312.
Two of the high voltage lead terminals 24 and two of the low voltage lead terminals 23 are respectively disposed on opposite sides of the coil 2, that is, on opposite sides of the pressing plate 6. The pressing plate 6 is provided with an avoiding gap at the part close to the high-voltage lead terminal 24 and the low-voltage lead terminal 23, and the avoiding gap enables the high-voltage lead terminal 24 and the low-voltage lead terminal 23 to be leaked out so as to be connected with a power module.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that they are relative concepts that may be modified in various manners of use and placement and that the use of directional terms should not be taken to limit the scope of what is claimed.
The embodiments and features of the embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A high frequency transformer adapted for use in a high power, high voltage power supply module, comprising:
an iron core;
a coil disposed around the core and including a plurality of low voltage windings and a plurality of high voltage windings, wherein the low voltage windings are connected in parallel and the high voltage windings are connected in series;
and the heat dissipation assembly comprises a bottom plate and an outer frame, wherein the bottom plate is a water cooling plate with a groove formed in the surface, the lower port of the outer frame is embedded in the groove, the coil is arranged in the outer frame, and the outer frame is filled with pouring sealant.
2. A high frequency transformer suitable for use in a high power high voltage power supply module as claimed in claim 1, wherein: the inner wall of the outer frame is provided with a plurality of cushion blocks, and the lower part of the coil is supported on each cushion block to be separated from the bottom plate.
3. A high-frequency transformer suitable for a high-power high-voltage power supply module as claimed in claim 2, wherein: the cushion block is a ceramic cushion block.
4. A high frequency transformer suitable for use in a high power high voltage power supply module as claimed in claim 1, wherein: the coil is arranged in the center of the coil in a penetrating mode, the insulating tubes surround the coil, a plurality of threaded connectors are arranged on the pressing plate, each threaded connector penetrates through the positioning rod or the insulating tube and is connected with the bottom of the groove, and therefore the pressing plate covers the upper port of the outer frame.
5. The high-frequency transformer for high-power high-voltage power supply module according to claim 4, wherein: the outer frame is a rectangular frame, the number of the insulating tubes is four, and the four insulating tubes are respectively arranged at four corners of the outer frame.
6. The high-frequency transformer for high-power high-voltage power supply module according to claim 4, wherein: the opposite two sides of the coil are respectively provided with a high-voltage lead terminal and a low-voltage lead terminal, and the part of the pressing plate, which is close to the high-voltage lead terminal and the low-voltage lead terminal, is provided with an avoiding notch.
7. A high frequency transformer suitable for use in a high power high voltage power supply module as claimed in claim 1, wherein: the lower port of the outer frame is embedded into the groove and connected through a fastening screw, and an adhesive is filled between the lower port of the outer frame and the groove.
8. The high-frequency transformer for high-power high-voltage power supply module according to claim 1, wherein: the water cooling plate is a red copper water cooling plate.
9. A high frequency transformer suitable for use in a high power high voltage power supply module as claimed in claim 1, wherein: the wires of the low-voltage winding and the high-voltage winding are all multi-strand litz wires, and polyimide adhesive tapes are wound on the outer surfaces of the multi-strand litz wires.
10. A high frequency transformer suitable for use in a high power high voltage power supply module as claimed in claim 1, wherein: the pouring sealant is a high-thermal-conductivity pouring sealant with the thermal conductivity coefficient of more than or equal to 1.8W/m.K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220843519.6U CN217333815U (en) | 2022-04-08 | 2022-04-08 | High-frequency transformer suitable for high-power high-voltage power supply module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220843519.6U CN217333815U (en) | 2022-04-08 | 2022-04-08 | High-frequency transformer suitable for high-power high-voltage power supply module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217333815U true CN217333815U (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220843519.6U Active CN217333815U (en) | 2022-04-08 | 2022-04-08 | High-frequency transformer suitable for high-power high-voltage power supply module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217333815U (en) |
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- 2022-04-08 CN CN202220843519.6U patent/CN217333815U/en active Active
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