Transformer and power supply unit using same

Abstract

The present invention relates to a transformer capable of maximizing a coil separation effect by reducing parasitic capacitance, and a power supply unit including the same. The transformer includes: a bobbin in which a plurality of winding spaces are formed on an outer surface of a tubular body having a through-hole formed in an inner center; and a plurality of coils stacked and wound in the plurality of winding spaces. The bobbin has at least one segment portion protruding from the body portion in an outer diameter direction parallel to the upper flange and the lower flange of the body portion and dividing the winding space into a plurality of winding spaces. The winding space is separated by the segmentation portion, and the coil wires are spaced apart from each other, so that parasitic capacitance can be effectively reduced. Further, the conductive wires are spaced apart from each other by the segmentation portion, so that a contact area at the wiring connection portion can be reduced, and insulation stability can be improved.

Description

Technical Field

[0001] The present disclosure relates to a transformer and a power supply unit, and more particularly, to a transformer capable of maximizing a coil separation effect by reducing parasitic capacitance and a power supply unit including the transformer. Background Art

[0002] Generally, driving an electronic device requires driving power, and a power supply unit (PSU) is basically used to provide the driving power for the electronic device.

[0003] In particular, display devices such as flat-panel televisions are required to be thin, and their sizes are continuously increasing. Therefore, it is necessary to reduce the thickness of large displays while meeting their increased power requirements.

[0004] In a power supply unit, the transformer is relatively large compared to other components. In order to realize a slim transformer, it is generally considered to omit thick components from the transformer or adjust their number.

[0005] As transformers become thinner, the spacing between winding coils decreases. This increases the parasitic capacitance between the coils. The increase in parasitic capacitance leads to an increase in operating frequency during no-load operation.

[0006] In a power supply unit, an increase in parasitic capacitance may cause a change in the output voltage under no-load conditions. Summary of the invention

[0007] Technical issues

[0008] An object of the present disclosure is to provide a transformer capable of reducing parasitic capacitance and a power supply unit using the transformer.

[0009] Another object of the present disclosure is to provide a transformer capable of effectively separating windings and a power supply unit using the transformer.

[0010] Technical Solution

[0011] According to an embodiment of the present disclosure, a transformer for achieving the above-mentioned purpose may include a coil frame, which includes a plurality of winding spaces defined on the outer peripheral surface of a tubular main body portion, a through hole is formed at the center of the tubular main body portion, and a plurality of coils are wound in a stacked manner in the plurality of winding spaces, wherein the coil frame may include at least one segmented portion protruding from the main body portion parallel to the upper flange and the lower flange to divide the winding space into a plurality of winding spaces.

[0012] In the transformer according to an embodiment of the present disclosure, the plurality of winding spaces may have the same size.

[0013] In the transformer according to an embodiment of the present disclosure, the segmented portion may divide the winding space into a lower winding space and an upper winding space.

[0014] In the transformer according to an embodiment of the present disclosure, the segment part may include a plurality of segment parts that divide the winding space into three or more winding spaces having the same width.

[0015] In the transformer according to an embodiment of the present disclosure, the through hole may have a rectangular cross-section.

[0016] In the transformer according to an embodiment of the present disclosure, the widths of the upper flange and the lower flange may be equal to or smaller than the width between inner peripheral surfaces of the through hole that are close to and face each other.

[0017] In the transformer according to an embodiment of the present disclosure, the widths of the upper flange and the lower flange may be greater than the width between inner peripheral surfaces of the through hole that are close to and face each other.

[0018] In a transformer according to an embodiment of the present disclosure, the plurality of coils may include a primary coil and a secondary coil, and at least one of the primary coil and the secondary coil may be a multi-insulated coil.

[0019] In the transformer according to an embodiment of the present disclosure, a portion of the plurality of coils may be wound to surround an outer peripheral surface of the segment portion.

[0020] In the transformer according to an embodiment of the present disclosure, the thickness of the segmented portion may be equal to the thickness of the upper flange and the lower flange.

[0021] In the transformer according to an embodiment of the present disclosure, the thickness of the segmented portion may be 0.4 to 0.7 times the thickness of the upper flange and the lower flange.

[0022] In the transformer according to an embodiment of the present disclosure, the width of the segmented portion may be formed to be 0.2 to 0.4 times the width of the upper flange and the lower flange.

[0023] In the transformer according to an embodiment of the present disclosure, the width of the segmented portion may be formed to be 0.6 to 0.8 times the width of the upper flange and the lower flange.

[0024] In the transformer according to an embodiment of the present disclosure, the segmented portion may have the same width as the upper flange and the lower flange.

[0025] In the transformer according to an embodiment of the present disclosure, the winding width of the coil may be smaller than the width of the segment portion.

[0026] A transformer according to another embodiment of the present disclosure may include: a core unit including an upper core and a lower core; a coil frame including a through hole formed in the center thereof so as to accommodate at least a portion of the core unit; and a coil unit at least partially accommodated in the core unit, the coil unit being arranged on the outer peripheral surface of the through hole, the coil unit including a primary coil and a secondary coil. Wherein, the coil frame may include: an upper flange protruding from one end of the outer peripheral surface of the through hole in a first direction and a second direction perpendicular to the first direction; a lower flange protruding from the other end of the outer peripheral surface of the through hole in the first direction and the second direction; a first segmented portion arranged between the upper flange and the lower flange, the first segmented portion protruding from the outer peripheral surface in the first direction; and a second segmented portion protruding from the outer peripheral surface in the second direction on the same line as the first segmented portion, the width of the second segmented portion being equal to or less than the width of the first segmented portion.

[0027] In a transformer according to another embodiment of the present disclosure, a ratio of a width of the second segment portion protruding from the outer circumferential surface to a width of the first segment portion protruding from the outer circumferential surface may be 0.1:1 to 1:1.

[0028] According to the present disclosure, a power supply unit may include a transformer, which includes a coil frame, the coil frame including a plurality of winding spaces defined on the outer peripheral surface of a tubular main body portion, a through hole being formed at the center of the tubular main body portion, and a plurality of coils being wound in a stacked manner in the plurality of winding spaces, wherein the coil frame may include at least one segmented portion protruding from the main body portion parallel to the upper flange and the lower flange to divide the winding space into a plurality of winding spaces, and the coil frame may include a plate configured to allow the transformer to be mounted thereon.

[0029] Beneficial Effects

[0030] The transformer and the power supply unit using the same according to the present disclosure can improve the separation effect between windings despite being slim, thereby preventing an increase in parasitic capacitance between windings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a perspective view of a transformer according to a first embodiment of the present disclosure.

[0032] Figure 2 yes Figure 1 A view of an embodiment of a coil former in FIG.

[0033] Figure 3a This is a cross-sectional diagram of a general transformer.

[0034] Figure 3b to Figure 3d is along Figure 1 A cross-sectional view taken along line AA' in FIG.

[0035] Figure 4 is a graph showing the reduction of parasitic capacitance of a transformer according to the present disclosure.

[0036] Figure 5a to Figure 5c yes Figure 3b to Figure 3d Front view of.

[0037] Figure 6 is a perspective view of a transformer according to a second embodiment of the present disclosure.

[0038] Figure 7 yes Figure 6 A view of an embodiment of a coil former in FIG.

[0039] Figures 8a to 8c is along Figure 6 A cross-sectional view taken along line BB' in FIG.

[0040] Fig. 9 is a perspective view of a transformer according to a third embodiment of the present disclosure.

[0041] Fig.10 yes Fig. 9 A view of an embodiment of a coil former in FIG.

[0042] Fig.11 is a perspective view of a transformer according to a fourth embodiment of the present disclosure.

[0043] Fig.12 yes Fig.11 A view of an embodiment of a coil former in FIG.

[0044] Fig.13 is a view showing a power supply unit on which a transformer is mounted according to the present disclosure. DETAILED DESCRIPTION

[0045] Various exemplary embodiments will now be described more fully with reference to the accompanying drawings, in which only some exemplary embodiments are shown. The specific structural and functional details disclosed herein are merely representative for the purpose of describing the exemplary embodiments. However, the present disclosure may be implemented in a variety of alternative forms and should not be construed as being limited to the exemplary embodiments set forth herein.

[0046] Therefore, although the exemplary embodiments of the present disclosure are capable of various modifications and alternative forms, their embodiments are shown in the drawings by way of example and will be described in detail herein. However, it should be understood that the present disclosure is not intended to be limited to the specific exemplary embodiments disclosed. On the contrary, the exemplary embodiments cover all modifications, equivalents or alternatives within the scope of the present disclosure.

[0047] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element; similarly, a second element may also be referred to as a first element without departing from the scope of the exemplary embodiments of the present disclosure.

[0048] It is understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. Conversely, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intermediate elements. Other words used to describe the relationship between elements should also be interpreted in a similar manner (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.).

[0049] The terms used herein are only used for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments of the present disclosure. The singular forms used herein are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "including" or "having" when used herein indicate the presence of the described features, integers, steps, operations, elements, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts or combinations thereof.

[0050] Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and unless explicitly defined in this application, these terms should not be interpreted as having an idealized or overly formal meaning.

[0051] At the same time, when an embodiment can be implemented in different ways, the functions or operations specified in a particular block can be executed in a different order than that shown in the flowchart. For example, two consecutive blocks can be executed simultaneously or in reverse order according to the related functions or operations.

[0052] A transformer and a power supply unit using the same according to the present disclosure will be described below with reference to the accompanying drawings.

[0053] In addition, considering that the transformer associated with the embodiment is installed on the circuit board of the display device, in order to contribute to the slimming of the display device, the thickness (or vertical height) of the transformer according to the present disclosure can be 14 mm or less from the upper surface of the circuit board, ideally 12 mm or less, and more ideally 10 mm or less.

[0054] Figure 1 is a three-dimensional diagram of a transformer according to an embodiment of the present disclosure, Figure 2 Yes Figure 1 1 is a view of an embodiment of a first coil frame after the coil in the transformer is removed. As shown in the figure, the coil frame 10 of the transformer includes two winding spaces separated by a segmented portion 13, and the coil 20 is wound in the winding space in a stacked manner.

[0055] The coil bobbin 10 includes: a through hole 11 formed in the center thereof; an upper flange 12 and a lower flange 14 extending from an outer peripheral surface 16 (formed in a tubular shape) of a body portion 15 in a first direction (i.e., an outer diameter direction) to define a winding space; and a segmented portion 13 protruding in the first direction between the upper flange 12 and the lower flange 14 to divide the winding space into a plurality of winding spaces. In this case, the segmented portion 13 may protrude from the outer peripheral surface 16 in parallel with the upper flange 12 and the lower flange 14.

[0056] The coil 20 can be wound in a plurality of spaces divided by the segmented portion 13, i.e., the upper winding space S1 and the lower winding space S2. The coil 20 provided in the coil frame 10 can be any one of the primary coil and the secondary coil, in which case a second coil frame (not shown) in which the other of the primary coil and the secondary coil is provided can be provided outside the coil frame 10 in the first direction. That is, the primary coil and the secondary coil can at least partially overlap each other in the first direction. Such overlap of the primary coil and the secondary coil in the first direction not only contributes to the slimming of the transformer, but also ensures the leakage inductance value required for the display. The second coil frame can include a segmented portion formed in a manner similar to the segmented portion 13 of the coil frame 10.

[0057] The upper flange 12 and the lower flange 14 are used to support the coil 20 wound in the winding spaces on both sides, and because the upper flange 12 and the lower flange 14 are formed of insulating material, they are also used to ensure insulation between the outside and the coil 20 .

[0058] In the present embodiment, the thickness t1 of the upper flange 12 and the thickness t2 of the lower flange 14 are the same (t1=t2). However, the thickness t1 and t2 may also be different (t1≠t2). The thickness t3 of the segmented portion 13 may be equal to or less than the thickness t1 of the upper flange 12 and the thickness t2 of the lower flange 14 (t1≥t3 or t2≥t3). The thickness of the segmented portion 13 may be 0.4 mm to 1.0 mm. With respect to the minimum thickness of 0.4 mm, considering the resolution of the coil frame injection molding process and the stress caused by the tension during the winding process, it is necessary to design and manufacture the segmented portion to a thickness of 0.4 mm or more. On the other hand, with respect to the maximum thickness of 1.0 mm, the effective window area of ​​the transformer that can be used to wind the coil and the cross-sectional area of ​​the coil will decrease as the thickness of the segmented portion in a given space increases. Therefore, if the thickness of the segmented portion is manufactured to exceed the required thickness, the heat generated by the transformer will increase, which may increase the possibility of coil damage, thereby causing the transformer performance to deteriorate.

[0059] The thickness t3 of the segmented portion 13 may be 0.4 to 0.7 times the thickness t1 of the upper flange 12 or the thickness t2 of the lower flange 14. The thicknesses of the flanges 12 and 14 and the segmented portion 13 may gradually decrease in the outer diameter direction.

[0060] Figure 3a is a cross-sectional view of a general transformer. As shown in the figure, a through hole 11 formed on the body of the coil frame is used as a channel for inserting a center leg (center leg, not shown) which is a part of the core. The present embodiment will be described by taking a through hole 11 having a rectangular cross-section as an example. This is a configuration formed according to the shape of the core inserted into the through hole 11. The coil frame 10 according to the present disclosure is not limited thereto, but a through hole 11 having various shapes can be formed according to the shape of the center leg inserted into the through hole 11. When the coil 20 is wound along the outer peripheral surface of the through hole 11, bending and uneven winding of the coil may cause an increase in leakage inductance.

[0061] Figures 3b to 3d The coil frame and coil edge of the transformer according to the present disclosure are Figure 1 The cross-sectional view taken along the line A-A' in FIG. The width W2 of the upper flange 12 and the width W2 of the lower flange 14 may be equal to or less than the width W1 (W1 ≥ W2) between the two inner peripheral surfaces of the through hole 11, which are surfaces relatively close to each other in the two pairs of opposing inner peripheral surfaces 17. The center column of the core is inserted into the through hole 11 corresponding to the width W1 between the two inner peripheral surfaces relatively close to each other of the through hole 11, and the space corresponding to the width W2 of the upper flange 12 and the lower flange 14 is related to the effective window area for coil winding, and can be designed according to the use environment.

[0062] Here, the width W2 of the flange refers to a horizontal distance from one of the two inner peripheral surfaces of the through hole 11 (which are surfaces relatively close to each other among the inner peripheral surfaces of the through hole 11 in the body portion 15 ) to the outer peripheral surface of each of the flanges 12 and 14 .

[0063] The space defined by the upper flange 12, the outer peripheral surface 16 of the main body 15, and the segmented portion 13 corresponds to the first winding space (upper winding space S1), and a portion of the coil 20 is wound in the first winding space. The space defined by the segmented portion 13, the outer peripheral surface 16 of the main body 15, and the lower flange 14 corresponds to the second winding space (lower winding space S2), and a portion of the coil 20 is wound in the second winding space. The coil 20 can be wound on the outer peripheral surface 16 of the main body 15 in various orders and forms. That is, any one of the primary coil and the secondary coil can be first wound in the first winding space S1 and then wound in the second winding space S2. If necessary, the coil can be first wound in the second winding space S2 and then wound in the first winding space S1.

[0064] The segmented portion 13 may be formed in various thicknesses and may be made of various materials as long as its shape can help reduce parasitic capacitance by separating the windings. In addition, although the present embodiment is described based on an example in which the segmented portion 14 is integrally formed with the main body portion 15 of the coil frame 10, the present disclosure is not limited thereto and may also have various applications, for example, the segmented portion 14 is formed as a separate independent member and is coupled to the coil frame 10. The coil 20 may be protected and insulated from the outside.

[0065] like Figure 3b to Figure 3d As shown, the segmented portions 13a, 13b and 13c having various widths can be formed. In this case, the width of the segmented portion refers to the horizontal distance that the segmented portion extends from one of the two inner peripheral surfaces of the through hole 11 (which are surfaces relatively close to each other among the inner peripheral surfaces of the through hole 11 in the body portion 15) in the outer diameter direction.

[0066] exist Figure 3b In the embodiment of the embodiment, the coil 20 wound on the coil frame 10A may include a coil 21 wound in the upper winding space S1, a coil 22 wound in the lower winding space S2, and a coil 23 wound to surround the outer peripheral surface of the segmented portion 13a. In this case, the widths of the coils 20 respectively arranged in the upper winding space S1 and the lower winding space S2 are both greater than the width of the segmented portion 13a, so that some windings are separated and other windings are not separated. Therefore, the effect of reducing parasitic capacitance by separating the windings is not obvious.

[0067] At the same time, Figure 3cIn the embodiment of the present invention, the winding widths of the coils respectively wound in the winding spaces S1 and S2 of the coil frame 10B are smaller than the width W4 of the segment 13b. When the width W4 of the segment 13b is 0.3 to 0.9 times (ideally 0.4 to 0.7 times) the width W2 of the upper flange 12 and the lower flange 14, in the coil 20 wound on the coil frame 10A, the coil 21 wound in the upper winding space S1 and the coil 22 wound in the lower winding space S2 are reliably separated from each other. Therefore, as Figure 4 As shown in the figure, this configuration helps to improve the parasitic capacitance to a normal level (the average value is reduced) and improve the dispersion (the standard deviation is reduced). In the graph, "before improvement" represents a configuration without a segmented portion, and "after improvement" represents a configuration with a segmented portion, and shows the parasitic capacitance measured in five transformer samples. It can be seen from the graph that the parasitic capacitance after improvement is reduced to a normal level.

[0068] The average improvement effect (i.e., the reduction in the absolute value of parasitic capacitance) can solve module failures caused by increased parasitic capacitance of transformer parts, such as no-load voltage regulation errors. The dispersion improvement effect may mean improved price competitiveness of transformer parts and improved mass production yield for transformer manufacturers.

[0069] Furthermore, both ends of the coil 20 (ie, the start and end points of the coil 20 ) are disposed to be separated from each other in each of the winding spaces S1 and S2 , so that the insulation stability can be further improved.

[0070] exist Figure 3d In the embodiment of the present invention, the width W5 of the segmented portion 13c is formed to be greater than 0.9 times the width W2 of the upper flange 12 and the lower flange 14. In this case, in the coil 20 wound on the coil frame 10A, the coil 21 wound in the upper winding space S1 and the coil 22 wound in the lower winding space S2 can be more reliably separated from each other, so that the parasitic capacitance can be further reduced. However, since the increase in the width of the segmented portion causes the volume of the upper winding space S1 and the lower winding space S2 to increase excessively, during the operation of the transformer, the heat generated by the core and the coil may be retained in each winding space, resulting in an increase in the temperature of the transformer, and the segmented portion may be damaged such as bending during the winding process of the coil 20.

[0071] Figure 5a to Figure 5c yes Figure 3b to Figure 3d Front view of the Figure 5aAs shown, the coil is first wound in the first winding space S1, wound around the outer peripheral surface of the segmented portion 13a, and then wound in the second winding space S2. As described above, the coil may be first wound in the second winding space S2, wound around the outer peripheral surface of the segmented portion 13a, and then wound in the first winding space S1. Although not shown in detail, the primary coil may be wound on the outer peripheral surface of the coil frame, and the secondary coil may be wound outside the primary coil. In this case, at least one of the primary coil or the secondary coil may be a multi-layer insulation coil.

[0072] like Figure 5b and 5c As shown, the width W3 of the segment portion 13a or the width W4 of the segment portion 13b can be formed to be 0.4 to 0.7 times the width W2 of the flanges 12 and 14, or the width W5 of the segment portion 13c can be formed to exceed 0.9 times the width W2 of the flanges 12 and 14.

[0073] Figure 6 is a three-dimensional diagram of a coil frame and a coil of a transformer according to a second embodiment of the present disclosure, Figure 7 yes Figure 6 . When a component has a large height and thus has additional space, and the number of windings of the coil to be wound is large, as in the second embodiment, another segmented portion may be added to the body portion of the coil former to more effectively separate the windings. This is merely exemplary, and more segmented portions may be added to further divide the winding space.

[0074] and Figure 1 Unlike the embodiment in FIG. 1 , two segmented parts 13-1 and 13-2 are formed in the coil frame 100B of the transformer. Although the two segmented parts 13-1 and 13-2 are shown to divide the winding space into three winding spaces S1, S2 and S3 having the same size, this is only a preferred embodiment, and the winding spaces S1, S2 and S3 can be formed to have different sizes according to the positions of the segmented parts formed on the outer peripheral surface 16 of the body part 15.

[0075] Furthermore, although the two segmented portions 13 - 1 and 13 - 2 are shown to have the same thickness and width, this is merely a preferred embodiment, and the two segmented portions may have different thicknesses or different widths as required.

[0076] Will omit Figure 1 and Figure 2The transformer bobbin 100B according to the second embodiment of the present disclosure includes: a bobbin 10 having three winding spaces S1, S2 and S3 divided by two segment parts 13-1 and 13-2; and a coil 20 wound in each winding space in a stacked manner.

[0077] Figures 8a to 8c is along Figure 6 The cross-sectional view taken along the line BB' in FIG. Figure 8a As shown, the coil 20 is wound in the winding spaces S1, S2, and S3 while being divided by the segmented portions 13-1a and 13-2a. In this case, the width of the coil 20 disposed in each winding space is greater than the width of the segmented portions 13-1a and 13-2a, so some windings are divided but other windings are not divided. Therefore, the effect of reducing the parasitic capacitance by dividing between the windings is not significant.

[0078] Similar to the first embodiment, Figure 8b As shown, the transformer 100B according to the second embodiment can be configured so that the width W4 of the segmented portions 13-1b and 13-2b formed on the bobbin 10E is 0.3 to 0.9 times, and preferably 0.4 to 0.7 times, the width W2 of the upper flange 12 and the lower flange 14. In this case, the coils 20 wound in the winding spaces S1, S2, and S3 in the bobbin 10B can be reliably separated from each other.

[0079] In addition, if Figure 8c As shown, the width W5 of the segmented portions 13-1c and 13-2c formed on the coil frame 10F can be formed to exceed 0.9 times the width W2 of the upper flange 12 and the lower flange 14. In this case, the coils 20 wound on the coil frame 10B can be more reliably separated from each other, so the parasitic capacitance can be further reduced. However, since the increase in the width of the segmented portion causes the volume of the winding space to increase excessively, during the operation of the transformer, the heat generated by the core and the coil may be retained in each winding space, thereby causing the transformer temperature to increase, and the segmented portion may be damaged such as bending during the process of winding the coil 20.

[0080] Fig. 9 is a perspective view of a transformer according to a third embodiment of the present disclosure, Fig.10 Yes Remove Fig. 9 A view of an embodiment of a bobbin for a coil in FIG.

[0081] As shown in the figure, the coil bobbin 10 of the transformer includes two winding spaces separated by a first segment portion 13 and a second segment portion 18, and a coil 20 is wound in each winding space in a stacked manner.

[0082] The bobbin 10 includes a body 15, an upper flange 12, a lower flange 14, a first segment 13, and a second segment 18. The body 15 is formed in a tubular shape, and a through hole 11 for accommodating a part of a core (not shown) is formed in the center thereof.

[0083] The upper flange 12 and the lower flange 14 protrude from both end portions of the body portion 15 in the outer diameter direction of the outer peripheral surface 16 of the body portion 15 .

[0084] The first segment 13 protrudes from the outer peripheral surface 16 between the upper flange 12 and the lower flange 14 in a first direction (e.g., the x-axis). The second segment 18 protrudes from the outer peripheral surface 16 in a second direction (e.g., the y-axis) on the same line as the first segment 13. In this case, the x-axis direction and the y-axis direction are directions perpendicular to each other on the same horizontal line, and the first segment 13 and the second segment 18 may protrude from the outer peripheral surface 16 in parallel with the upper flange 12 and the lower flange 14.

[0085] The ratio of the width of the second segment 18 protruding from the outer circumferential surface 16 to the width of the first segment 13 protruding from the outer circumferential surface 16 may be 0.1:1 to 1:1. That is, the protruding width of the second segment 18 is equal to or smaller than the protruding width of the first segment 13.

[0086] The end of the wound coil 20 should be wired into a portion of the coil bobbin 10 where the second segmented portion 18 is formed so as to be connected to the end pin. In this case, if the second segmented portion 18 protrudes too long from the outer peripheral surface 16, the path for the end of the coil 20 to reach the end pin becomes long. Therefore, if the protruding width of the second segmented portion 18 is appropriately reduced according to the volume of the coil 20 to be wound, unnecessary size increase can be avoided.

[0087] As the volume of the transformer increases, the size of the coil frame 10 and the segments 13 and 18 will also increase accordingly. If the second segment 18 protrudes too long, its structure will be unstable, so the second segment 18 may be damaged during the coil wiring process. Therefore, if the protruding width of the second segment is reduced, its mechanical stability can be enhanced to prevent damage. The reduction in the length of the second segment 18 helps to reduce the weight of the part.

[0088] The thickness of the first segment 13 and the second segment 18 can be 0.4 mm to 1.0 mm. With respect to the minimum thickness of 0.4 mm, it is necessary to design and manufacture the segment to be 0.4 mm or more in consideration of the accuracy of the coil former injection molding process and the stress caused by the tension during the winding process. On the other hand, with respect to the maximum thickness of 1.0 mm, the effective window area of ​​the transformer that can be used to wind the coil and the cross-sectional area of ​​the coil will decrease as the thickness of the segment increases in a given space. Therefore, if the thickness of the segment is manufactured to exceed the required thickness, the heat generated by the transformer will increase, which may increase the possibility of coil damage, thereby causing the transformer to perform poorly.

[0089] The thickness t3 of the first and second segmented portions 13 and 18 may be 0.4 to 0.7 times the thickness t1 of the upper flange 12 or the thickness t2 of the lower flange 14 .

[0090] Fig.11 is a perspective view of a transformer according to a fourth embodiment of the present disclosure, Fig.12 yes Fig.11 A view of an embodiment of a coil former in FIG.

[0091] When a component has a greater height and thus has additional space, and the number of windings of the coil to be wound is large, as in the second embodiment, another segmented portion can be added to the body portion of the coil frame to more effectively separate the windings. This is merely exemplary, and more segmented portions can be added to further divide the winding space.

[0092] and Fig. 9 Unlike the embodiment in the embodiment, a coil frame 10 of a transformer is shown, in which two first segmented parts 13-1 and 13-2 and two second segmented parts 18-1 and 18-2 are formed. Although the two first segmented parts 13-1 and 13-2 and the two second segmented parts 18-1 and 18-2 are shown as dividing the winding space into three winding spaces S1, S2 and S3 having the same size, this is only a preferred embodiment, and the winding spaces S1, S2 and S3 can be formed to have different sizes according to the positions of the segmented parts formed on the outer peripheral surface 16 of the body part 15.

[0093] Furthermore, although the two first segment portions 13 - 1 and 13 - 2 are shown to have the same thickness and width, this is merely a preferred embodiment, and the two segment portions may have different thicknesses or different widths as required.

[0094] Transformers having various configurations described above may be mounted on the board 200, such as Fig.13 As shown, and can be applied in a power supply unit.

[0095] The transformer according to the present disclosure can use the segmented part to divide the winding space to separate the coil windings, thereby effectively reducing the parasitic capacitance. In this way, due to the reduction of the parasitic capacitance, it is possible to prevent the board from malfunctioning.

[0096] Furthermore, the smaller the distance between the windings, the higher the risk of short circuiting the wiring portion. However, according to the present disclosure, since the windings are separated by the segmented portion, the contact area at the wiring portion can be reduced, and thus the insulation stability can be improved.

[0097] Furthermore, since the wirings are uniformly arranged in the wiring space divided by the segmented portion, the dispersion of the inductance can be improved, and thus the error rate can be reduced.

[0098] Although exemplary embodiments of the present disclosure have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the disclosure as disclosed in the accompanying claims.

[0099] Industrial Applicability

[0100] The transformer of the present disclosure may be used as a power supply unit in a flat panel display device.

Claims

1. A transformer, comprising: A core unit, comprising an upper core and a lower core; a coil former including a through hole formed at the center thereof to accommodate at least a portion of the core unit; as well as a coil unit at least partially accommodated in the core unit, the coil unit being disposed on an outer peripheral surface of the through hole, the coil unit including a primary coil and a secondary coil, Wherein, the coil frame comprises: an upper flange protruding from one end portion of the outer peripheral surface of the through hole in the outer diameter direction; a lower flange protruding from the other end of the outer peripheral surface of the through hole in the outer diameter direction; and At least one segmented portion is provided between the upper flange and the lower flange, and the at least one segmented portion protrudes from the outer peripheral surface of the through hole in the outer diameter direction.

2. The transformer according to claim 1, comprising: an upper winding space defined between the upper flange and the segmented portion; as well as a lower winding space defined between the lower flange and the segmented portion, Wherein, the coil unit is arranged in the upper winding space and the lower winding space.

3. The transformer according to claim 2, wherein: The primary coil and the secondary coil at least partially overlap each other in the outer diameter direction.

4. The transformer according to claim 3, wherein: The segmented portion is provided in plurality.

5. The transformer according to claim 3, wherein: The widths of the upper flange and the lower flange are both equal to or smaller than the width between inner peripheral surfaces of the through hole that are close to each other and face each other.

6. The transformer according to claim 3, wherein: The thickness of the segmented portion is equal to or smaller than the thickness of the upper flange and the lower flange.

7. The transformer according to claim 6, wherein: The thickness of the segmented portion is formed to be 0.4 to 0.7 times the thickness of the upper flange and the lower flange.

8. The transformer according to claim 3, wherein: The width of the segmented portion is formed to be 0.3 to 0.9 times the width of the upper flange and the lower flange.

9. The transformer according to claim 3, wherein: The width of the segmented portion is formed to be 0.4 to 0.7 times the width of the upper flange and the lower flange.

10. The transformer according to claim 8, wherein: The winding width of the coil is smaller than the width of the segment portion.

11. A transformer, comprising: A core unit, comprising an upper core and a lower core; a coil former including a through hole formed at the center thereof to accommodate at least a portion of the core unit; as well as a coil unit at least partially accommodated in the core unit, the coil unit being disposed on an outer peripheral surface of the through hole, the coil unit including a primary coil and a secondary coil, Wherein, the coil frame comprises: an upper flange protruding from one side end portion of the outer peripheral surface of the through hole in a first direction and in a second direction perpendicular to the first direction; a lower flange protruding from the other side end of the outer peripheral surface of the through hole in the first direction and the second direction; a first segmented portion provided between the upper flange and the lower flange, the first segmented portion protruding from the outer peripheral surface in the first direction; and The second segment portion protrudes from the outer peripheral surface in the second direction on the same line as the first segment portion, and the width of the second segment portion protruding from the outer peripheral surface is equal to or smaller than the width of the first segment portion protruding from the outer peripheral surface.

12. The transformer according to claim 11, wherein: A ratio of a width of the second segment portion protruding from the outer peripheral surface to a width of the first segment portion protruding from the outer peripheral surface is 0.1:1 to 1:

1.

13. A power supply unit, comprising: A transformer according to any one of claims 1 to 12; as well as A plate configured to allow the transformer to be mounted thereon.

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