TWI712057B - Planar transformer - Google Patents

Abstract

The invention discloses a planar transformer comprising a plurality of cores and a plurality of winding layers, each core comprises a central column, a first gap between the cores; the winding layers are stacked and surrounding the central column. It is configured that each winding layer has a heat dissipation hole, and the positions of the heat dissipation holes correspond to the first gap, and the first gap and the heat dissipation holes are in communication with each other. A heat dissipation path inside the planar transformer can be form by the first gap between the cores and the heat dissipation holes connecting the first gap on the winding layers, so as to take away the thermal energy that is easily accumulated in the interior, thereby enhancing the heat dissipation effect.

Description

Flat transformer

The invention relates to a transformer, especially a flat-panel transformer.

The flat-panel transformer is a new type of transformer that uses the copper layer of the printed circuit board (PCB) to replace the traditional copper wire winding. It is flat and has the characteristics of reducing the volume.

The structure of the existing flat transformer is roughly that the winding circuit board is arranged around the middle column of the Japanese-shaped iron core, and mainly relies on air-cooled heat dissipation means to allow the surrounding system to convection away the heat generated by the work. However, the power density of the flat-panel transformer is high, and the outer frame of the Japanese iron core covers a lot of the surface area of the winding circuit board, resulting in the laminated winding circuit board and the pillar in the iron core at the inner center of the overall structure. The heat energy is easy to accumulate, and the cooling efficiency of the surrounding air cooling is often not enough to cope with the rapid heat generation, which causes problems such as overheating of the components or shortening the life of the components.

One purpose of the present invention is to solve the problem that the internal heat energy is easy to accumulate and the heat dissipation efficiency is not good when the existing flat transformer works.

Another object of the present invention is to provide a flat transformer with a heat dissipation structure.

In order to achieve the above and other objectives, the present invention provides a flat-panel transformer including a plurality of cores and a plurality of winding layers. Each core includes a central column with a first gap between the cores; the winding layers are stacked It is arranged around the central pillars, each winding layer has a heat dissipation hole, and the position of the heat dissipation hole corresponds to the first gap, wherein the first gap and the heat dissipation holes are connected to each other.

In an embodiment of the present invention, there is a second gap between the winding layers.

In an embodiment of the present invention, it further includes a wind deflector, which is arranged under the cores, the wind deflector has an air inlet and an air duct connected to the air inlet, and the wind deflector The channel is communicated with the first gap between the core.

In an embodiment of the present invention, a forced convection device is further included, which is arranged on one side of the cores, and the forced convection device provides air flow toward the cores.

In one embodiment of the present invention, the heat dissipation holes on different winding layers are aligned.

In an embodiment of the present invention, the first gap is 1 mm or more.

In an embodiment of the present invention, the second gap is 1 mm or more.

In an embodiment of the present invention, the opening direction of the air inlet of the air guide is parallel to the extending direction of the first gap on the bottom surface of the cores.

In an embodiment of the present invention, the wind deflector has a plurality of supporting ribs, and the positions of the supporting ribs correspond to the positions of the cores and do not overlap with the first gap.

To sum up, the flat transformer of the above embodiment of the present invention can be arranged in the first gap between the cores and the heat dissipation holes connected to the first gap on each winding layer. A heat dissipation path is formed inside the flat transformer to take away the heat that is easy to accumulate in the interior, thereby enhancing the heat dissipation effect; and, through the arrangement of the second gap between the winding layers and the second gap connecting the heat dissipation hole and the first gap , Further enhance the heat dissipation effect in the horizontal and vertical directions inside the flat transformer.

100: flat transformer

110: core

110A: upper part

110B: lower part

111: center pillar

112: first gap

120: winding layer

121: cooling hole

122: central opening

123: protrusion

124: second gap

130A, 130B: connecting plate

131: mounting hole

132A: Primary side conductive parts

132B: Secondary side conductive parts

140: system fan

150: Wind hood

151: Air Inlet

152: air duct

153: Support rib

154: Curved Surface

160: Forced convection device

[Figure 1] is a three-dimensional schematic diagram of the flat transformer in the first embodiment of the present invention.

[Figure 2] is an exploded schematic diagram of the flat transformer in the first embodiment of the present invention.

[Figure 3] is a schematic diagram of the structure of the flat transformer in the first embodiment of the present invention.

[Fig. 4] is a schematic diagram of the use state of the flat transformer according to the second embodiment of the present invention.

[Fig. 5] is a schematic diagram of the structure of a flat transformer according to the third embodiment of the present invention.

[Fig. 6] is a side perspective schematic view of Fig. 5.

[Fig. 7] is a three-dimensional schematic diagram of the wind deflector in the third embodiment of the present invention.

[Fig. 8] is a schematic structural view of the flat transformer according to the third embodiment of the present invention from another perspective.

[Fig. 9] is a schematic diagram of the structure of a flat transformer according to the fourth embodiment of the present invention.

In order to fully understand the purpose, features and effects of the present invention, the following specific embodiments are used in conjunction with the accompanying drawings to give a detailed description of the present invention. The description is as follows:

In this article, the term "a" or "one" is used to describe components, structures, devices, modules, systems, or equipment. This is just for the convenience of description, and it is a great example of the present invention. Domain provides general meaning. Therefore, unless it is clearly stated otherwise, this description should be understood as including one or at least one, and the singular number also includes the plural number.

In this article, the term "including, including, having" or any other similar terms described in this article is not limited to the elements listed in this article, but may include the components, Other elements or steps usually inherent in structures, devices, modules, systems or equipment.

In this article, the terms "first" or "second" and other similar ordinal numbers are used to distinguish or refer to the same or similar signals, elements or operations, and do not necessarily imply these signals or elements Or the order of operations. It should be understood that, in some situations or configurations, ordinal numbers can be used interchangeably without affecting the implementation of the present invention.

Please refer to Figures 1 to 3. Figure 1 is a three-dimensional schematic diagram of the flat transformer in the first embodiment of the present invention; Figure 2 is an exploded schematic diagram of the flat transformer in the first embodiment of the present invention; Figure 3 is the present invention The schematic diagram of the heat dissipation path of the flat transformer in the first embodiment.

The flat transformer 100 of the embodiment of the present invention mainly includes a plurality of cores 110 and a plurality of winding layers 120. Each core 110 includes a center pillar 111 (please refer to FIG. 2), a first gap 112 is formed between the cores 110, and the winding layers 120 are arranged in a stack and surround the center pillars 111 2 and 3, each winding layer 120 has a heat dissipation hole 121, the position of the heat dissipation hole 121 corresponds to the first gap 112, wherein the first gap 112 and the heat dissipation holes 121 are Connected to each other, as shown in FIG. 3, the first gap 112 and the heat dissipation holes 121 can form a heat dissipation path, so that the heat in the center of the structure can be taken away by the airflow passing through, thereby achieving the effect of enhancing heat dissipation.

As shown in the examples of Figures 1 and 2, each of the cores 110 may have an outer frame or an outer ring, and each of the central pillars 111 is disposed in the middle of the outer frame or the outer ring, and further separates two passages. Each of the cores 110 It can be in the shape of a reclining "日". Each of the cores 110 can be made up of an upper part 110A and a The lower part 110B is assembled so that the winding layers 120 are confined between the upper part 110A and the lower part 110B. The upper part 110A and the lower part 110B can be in opposite shapes of "E", as shown in FIG. 2 Show but not limited to this.

Each of the winding layers 120 may be a printed circuit board (PCB), and the copper layer thereon serves as windings. Each of the winding layers 120 has a central opening 122 through which the pillar 111 of each of the core 110 can pass, and the copper layer serving as the winding surrounds the central opening 112 and avoids the heat dissipation hole 121. The figure shown is only an example. The number of heat dissipation holes 121 may be more than one. More preferably, there may be two heat dissipation holes 121 on each winding layer 120 and corresponding to a first gap 112. The holes 121 are arranged on two opposite sides of the central opening 122. In addition, the shape of each heat dissipation hole 121 is not limited, and it can be rectangular or circular. In this embodiment, each of the heat dissipation holes 121 is rectangular, and at least one side length is greater than or equal to 2 mm.

The winding layers 120 can be stacked, so that the central openings 122 of the winding layers 120 together form a space for accommodating the pillars 111 of the cores 110.

As shown in Figures 1 and 2, the winding layers 120 are supported and fixed by two connecting plates 130A, 130B. For example, each winding layer 120 has a protruding portion 123 for inserting The corresponding mounting holes 131 are placed on the connecting plates 130A, 130B, so that each winding layer 120 can be supported and fixed by the corresponding connecting plates 130A, 130B.

The number of the winding layers 120, the line width of the copper layer thereon, the form of the winding, etc. can be designed according to usage requirements, and are not limited to the examples in the embodiments and drawings. In this embodiment, the winding layer 120 on the odd-numbered layer is used as the primary side, which is electrically connected by the primary side conductive member 132A; the winding layer 120 on the even-numbered layer is used as the secondary side, which is electrically connected by the secondary side. The piece 132B is electrically connected.

In addition, the number of the cores 110 is not limited to the examples in the embodiment and the drawings. They can be divided into at least two pieces along the direction of the magnetic field. The specific number can be based on the size of the transformer and other parameters in response to requirements, without affecting Determined based on electrical characteristics.

As shown in FIG. 3, the design of the heat dissipation hole 121 on each winding layer 120 corresponding to the first gap 112 between the cores 110 makes the inside of the flat heat sink structure of the first embodiment A heat dissipation path can be formed, and the system air flow provided inside the device can pass through the heat dissipation path to take away the heat accumulated in the flat transformer 100, thereby enhancing the heat dissipation effect.

The first gap 112 may be 1 mm or more. For example, in this embodiment, each of the first gaps 112 is 2 mm. However, the system is not limited to this, and the first gap 112 can be changed according to various parameters such as overall volume requirements, space requirements, and electrical characteristics.

Please refer to FIG. 4, which is a schematic diagram of the use state of the flat transformer according to the second embodiment of the present invention. For ease of description and illustration, the connecting plates 130A, 130B are not shown in the drawing.

In this embodiment, there may be a second gap 124 between the winding layers 120, and the second gaps 124 are connected between the heat dissipation holes 121 on the winding layers 120 and the cores 110. The first gap 112 (refer to FIGS. 1 to 3 at the same time).

Accordingly, the system air flow can pass through the second gaps 124 between the winding layers 120, the heat dissipation holes 121 on the winding layers 120 and the first gap 112 between the cores 110, Thereby, the heat energy easily accumulated in the flat transformer 100 can be taken away, and the effect of heat dissipation is further achieved in the horizontal and vertical directions.

Preferably, the flat-panel transformer 100 of the second embodiment of the present invention is preferably set in accordance with the arrangement direction of a system fan 140, which is usually a device inside a host or device for providing system convection. For example, the flat transformer 100 is preferably configured such that the system fan 140 The blowing direction is preferably toward the first gaps 112 between the cores 110, so that system convection enters from the first gap 112 on the side facing the system fan 140, and then from the winding layers 120 The heat dissipation holes 121 and the second gaps 124, and the first gaps 112 between the cores 110 flow out, thereby achieving the effect of enhancing heat dissipation.

In this embodiment, the second gap 124 can be 1 mm or more, but it is not limited to this. The second gap 124 can be changed according to various parameters such as overall volume requirements, space requirements, and the volume of electronic components on the PCB. . Wherein, under a fixed overall volume and space requirement, each winding layer 120 can be combined with a single board to reserve the second gaps 124 to have enough space.

Please refer to Figures 5 to 8. Figure 5 is a schematic structural diagram of a flat transformer according to a third embodiment of the present invention; Figure 6 is a lateral perspective schematic view of Figure 5; Figure 7 is a wind guide in the third embodiment of the present invention The three-dimensional schematic diagram of the cover; FIG. 8 is a schematic structural diagram of the flat transformer according to the third embodiment of the present invention from another perspective.

In this embodiment, the flat-panel transformer 100 further includes an air guide 150, which is disposed under the cores 110. The air guide 150 has an air inlet 151 and an air guide connected to the air inlet 151 The air duct 152 communicates with the first gap 112 between the core 110, and passes through the first gap 112 between the cores 110 to dissipate heat from the winding layer 120 at the lowest layer. The hole 121 communicates.

The wind deflector 150 can enhance the guiding of the system convection under the core 110 into the flat transformer 100, thereby enhancing the vertical convection through the flat transformer 100 and further improving the heat dissipation effect.

As shown in FIG. 5, in this embodiment, the heat dissipation holes 121 on the different winding layers 120 are aligned so that the path through which the air flows is substantially straight from bottom to top. However, it is not limited to this, different The heat dissipation holes on the group layer can also be arranged in a non-aligned manner (not shown), such as staggered, partially overlapping, or completely non-overlapping, so that the path through which the airflow passes is serpentine. The airflow is due to wind pressure. It can flow outwards and still have the effect of internal heat dissipation.

Please cooperate with FIG. 5 and FIG. 6, in this embodiment, the opening direction of the air inlet 151 of the wind deflector 150 is preferably parallel to the extending direction of the first gap 112 on the bottom surface of the core 110, so that The flow direction of the airflow flowing into the wind deflector 150 is parallel to the length direction of the first gaps 112, which helps stabilize the flow field and increase the flow rate that can flow into the heat dissipation holes 121.

Please refer to FIGS. 7 and 8 together. In this embodiment, the wind deflector 150 has a plurality of supporting ribs 153. The positions of the supporting ribs 153 correspond to the positions of the cores 110 and are not related to the positions of the cores 110. A gap 112 overlaps. The number of the supporting ribs 153 can be equal to the number of the cores 110, and the position of each supporting rib 153 corresponds to the bottom of each of the cores 110 to support each of the cores 110.

The extension direction of each support rib 153 is parallel to the extension direction of each first gap 112, and the position of each support rib 153 does not overlap with each first gap 112, so as to avoid blocking the air flow entering each first gap 112 . In addition, each of the supporting ribs 153 partitions a plurality of sub-channels between the air guiding channels 152 of the air guiding hood 150, which can stabilize the flow field.

In addition, the wind deflector 150 is opposite to the side of the air inlet 151, and may have an arc surface 154 so that the airflow can be turned vertically upward along the arc surface 154.

Please refer to FIG. 9, which is a schematic structural diagram of a flat transformer according to a fourth embodiment of the present invention.

The fourth embodiment of the present invention is different from the third embodiment in that in this embodiment, the wind deflector in the third embodiment is replaced with a forced convection device.

The fourth embodiment of the present invention includes a forced convection device 160, which is disposed on one side of the cores 110, and the forced convection device 160 provides airflow toward the cores 110, so that the airflow passes through the first gaps. 112 and the heat dissipation holes 121. The forced convection device 160 can be, for example, a cooling fan, and the forced convection device 160 can be fixedly supported on one side of the core 110 by the connecting plates 130A, 130B.

Accordingly, the forced convection device 160 can force the system convection on one side of the cores 110 to guide the system convection into the flat-panel transformer 100, thereby enhancing the convection that can pass through the flat-panel transformer 100 and further improve the effect of heat dissipation. .

In this embodiment, the forced convection device 160 can be arranged on the cores 110 on the other side except the bottom, and can also provide airflow toward the first gaps 112, so that the airflow can pass through the first gaps 112 Wait for the second gap 124 and/or the heat dissipation holes 121 to achieve the effect of heat dissipation.

To sum up, the flat transformer in the above embodiment of the present invention can be installed in the flat transformer by using the first gap between the cores and the heat dissipation holes connecting the first gap on each winding layer. A heat dissipation path is formed inside to take away the heat that is easy to accumulate inside, thereby enhancing the heat dissipation effect; and, by the arrangement of the second gap between the winding layers and the second gap connecting the heat dissipation hole and the first gap, The heat dissipation effect in the horizontal and vertical directions inside the flat transformer is further enhanced.

The present invention has been disclosed in a preferred embodiment above, but those skilled in the art should understand that the embodiment is only used to describe the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to this embodiment should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the scope of the patent application.

100: flat transformer

110: core

110A: upper part

110B: lower part

111: center pillar

112: first gap

120: winding layer

121: cooling hole

122: central opening

123: protrusion

130A, 130B: connecting plate

131: mounting hole

132A: Primary side conductive parts

132B: Secondary side conductive parts

Claims (8)

A flat-panel transformer includes: a plurality of cores, each core includes a center column with a first gap between the cores; and a plurality of winding layers, the winding layers are stacked and arranged around the center columns, Each winding layer has a heat dissipation hole, the position of the heat dissipation hole corresponds to the first gap, and a second gap is formed between the winding layers, wherein the first gap and the heat dissipation holes are connected to each other. The flat transformer according to claim 1, which further includes a wind deflector which is arranged under the cores, the wind deflector having an air inlet and an air duct connecting the air inlet, and the The air duct is communicated with the first gap between the core. The flat-plate transformer according to claim 1, which further includes a forced convection device, which is arranged on one side of the cores, and the forced convection device provides air flow toward the cores. The flat transformer according to claim 2 or 3, wherein the heat dissipation holes on different winding layers are aligned. The flat transformer according to claim 4, wherein the first gap is 1 mm or more. The flat transformer according to claim 4, wherein the second gap is 1 mm or more. The flat transformer according to claim 2, wherein the opening direction of the air inlet of the wind deflector is parallel to the extending direction of the first gap on the bottom surface of the cores. The flat transformer according to claim 7, wherein the wind deflector has a plurality of supporting ribs, and the positions of the supporting ribs correspond to the positions of the cores and do not overlap with the first gap.

Images