TWI627645B - Transformer structure - Google Patents

Abstract

A transformer structure includes a first winding module, a second winding module, and an insulating sleeve. The first winding module includes a first bobbin, a first coil, and a first core. The first coil is wound around the first bobbin, and the first bobbin is disposed on the first core. The second winding module includes a second bobbin, a second coil, and a second core. The second coil is wound on the second bobbin, and the second bobbin is disposed on the second core. The insulating sleeve is sleeved on the first winding shaft. The insulating sleeve includes a base portion and a side wall portion, and the side wall portion is circumferentially connected to the base portion to form a receiving groove. At least a portion of the first bobbin, at least a portion of the first coil, and a portion of the first core are located in the receiving groove, and the base is interposed between the first bobbin and the second bobbin.

Description

Transformer structure

The present invention relates to a transformer, and more particularly to a partial structure of a transformer.

As electronic products evolve and evolve, different electronic products need to be driven with different voltages. In order to make the transformer more widely used in various power supply devices of different specifications, some operators try to adjust the leakage inductance generated by the transformer. A conventional transformer structure includes phase-separated primary-side coils and secondary-side coils, and the spacing between the primary-side coils and the secondary-side coils is adjusted during assembly to increase or decrease leakage inductance.

When a high voltage is applied to the primary side coil of the transformer structure, if the spatial distance and the creep distance between the primary side coil and the secondary side coil are too short, the user is prone to electrical operation when operating the transformer. accident. Therefore, the spacing between the primary side coil and the secondary side coil in the conventional transformer structure must be increased as much as possible to provide a longer spatial distance and creeping distance to ensure electrical safety. However, increasing the spacing between the primary side coil and the secondary side coil increases the volume of the transformer, which is disadvantageous for use in thin and light electronic products, thereby limiting the application range of the transformer. In addition, as the pitch increases, the magnetic resistance of the transformer structure increases and the inductance decreases, resulting in poor pressure transformation efficiency.

In view of the above problems, the present invention discloses a transformer structure, which helps solve the problem that the distance between the primary side coil and the secondary side coil is too large, resulting in excessive transformer volume and poor pressure transformation efficiency.

The transformer structure disclosed in the present invention comprises a first winding module, a second winding module and at least one insulating sleeve. The first winding module includes a first bobbin, a first coil and a first core. The first coil is wound around the first bobbin, and the first bobbin is disposed on the first core. The second winding module includes a second bobbin, a second coil and a second core. The second coil is wound on the second bobbin, and the second bobbin is disposed on the second core. The insulating sleeve is sleeved on the first winding shaft. The insulating sleeve includes a base portion and a side wall portion, and the side wall portion is circumferentially connected to the base portion to form a receiving groove. At least a portion of the first bobbin, at least a portion of the first coil, and a portion of the first core are located in the receiving groove, and the base is interposed between the first bobbin and the second bobbin.

According to the transformer structure disclosed in the present invention, the insulating sleeve includes a base and a side wall portion circumferentially connected to the base. A portion of the first bobbin, a portion of the first coil and a portion of the first core are located in a receiving groove formed by the base portion and the side wall portion, and the base portion is interposed between the first bobbin and the second bobbin. Thereby, by arranging the insulating sleeve, the base helps to make the spatial distance between the first coil and the second coil more suitable to meet the requirements of miniaturization and electrical safety, and the side wall portion helps to increase the first coil and the second coil. The creeping distance between the coils improves electrical safety, and also avoids excessive spacing between the first winding module and the second winding module, and can maintain the miniaturization of the transformer structure.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1A to FIG. 1C. 1A is a perspective view of a transformer structure in accordance with a first embodiment of the present invention. FIG. 1B is an exploded perspective view of the transformer structure of FIG. 1A. 1C is a schematic cross-sectional view of the transformer structure of FIG. 1A. In this embodiment, the transformer structure 1 includes a first winding module 10, a second winding module 20, a first insulating sleeve 30, and a second insulating sleeve 40.

The first winding module 10 includes a first bobbin 110, a first coil 120 and a first core 130. The first coil 120 is wound around the first bobbin 110, and the first bobbin 110 is disposed on the first core 130. In detail, the first core 130 includes a central portion 131 and two extensions 132 that are connected. The first bobbin 110 is sleeved on the central portion 131 of the first core 130 and between the two extensions 132. In the present embodiment, the first winding module 10 is used as the primary side of the transformer structure 1 (ie, the primary side).

The second winding module 20 includes a second bobbin 210, a second coil 220 and a second core 230. The second coil 220 is wound around the second bobbin 210, and the second bobbin 210 is disposed on the second core 230. In detail, the second core 230 includes a central portion 231 and two extensions 232 that are connected. The second bobbin 210 is sleeved on the central portion 231 of the second core 230 and between the two extensions 232 . In this embodiment, the second winding module 20 is used as the secondary side of the transformer structure 1 (ie, the secondary side), and the first winding shaft 110 and the second winding of the first winding module 10 are The spool 210 is substantially a total of one axis C.

The first insulating sleeve 30 is sleeved on the first winding module 10 . In detail, the first insulating sleeve 30 includes a base portion 310 and a side wall portion 320. The base portion 310 has an opposite inner surface 311 and an outer surface 312, and the side wall portion 320 is circumferentially connected to the inner surface 311 of the base portion 310 to form a receiving groove 330. The base portion 310 of the first insulating sleeve 30 is interposed between the first winding module 10 and the second winding module 20, and the inner surface 311 and the outer surface 312 of the base portion 310 face the first winding module 10 and the first Two winding module 20. The side wall portion 320 extends from the inner surface 311 of the base portion 310 along the axis C toward one end of the first bobbin axis 110 away from the second bobbin axis 210. In this embodiment, the sidewall portion 320 of the first insulating sleeve 30 surrounds the first bobbin 110, the first coil 120, and the central portion 131 and the extending portion 132 of the first core 130, so that the first bobbin 110, the first A coil 120 and a portion of the first core 130 are located in the receiving groove 330.

The second insulating sleeve 40 is sleeved on the second winding module 20 . In detail, the second insulating sleeve 40 includes a base portion 410 and a side wall portion 420. The base portion 410 has an opposite inner surface 411 and an outer surface 412, and the side wall portion 420 is circumferentially connected to the inner surface 411 of the base portion 410 to form a receiving groove 430. The base 410 of the second insulating sleeve 40 is interposed between the first winding module 10 and the second winding module 20, and the inner surface 411 and the outer surface 412 of the base 410 face the second winding module 20 and the first A winding module 10. The side wall portion 420 extends from the inner surface 411 of the base portion 410 along the axis C toward one end of the second bobbin 210 away from the first bobbin axis 110. In this embodiment, the sidewall portion 420 of the second insulating sleeve 40 surrounds the second bobbin 210, the second coil 220, and the central portion 231 and the extension portion 232 of the second core 230, so that the second bobbin 210, the second The second coil 220 and a portion of the second magnetic core 230 are located in the receiving groove 430.

In the present embodiment, by arranging the first insulating sleeve 30 and the second insulating sleeve 40, the base portion 310 and the base portion 410 help to make the spatial distance between the first coil 120 and the second coil 220 suitable for both miniaturization and electrical There is a need for safety, and the side wall portion 320 and the side wall portion 420 help to increase the creeping distance between the first coil 120 and the second coil 220. Thereby, the first insulating sleeve 30 and the second insulating sleeve 40 help to improve electrical safety, and avoid the interval between the first winding module 10 and the second winding module 20 is too large, and the transformer structure 1 can be kept small. Chemical.

In order to improve electrical safety, in the present embodiment, the extension length L1 of the side wall portion 320 is equal to the axial length H1 of the first bobbin shaft 110, and the extension length L2 of the side wall portion 420 is equal to the axial length H2 of the second bobbin shaft 210, It can provide enough creeping distance. The extension lengths L1 and L2 can be adjusted according to the degree of electrical insulation of the materials of the first insulating sleeve 30 and the second insulating sleeve 40. In other embodiments, the extended lengths L1 and L2 are greater than the axial lengths H1 and H2, respectively. In other embodiments, the extension lengths L1 and L2 are respectively equal to one-half of the axial lengths H1 and H2. In other embodiments, the extension lengths L1 and L2 are respectively equal to one-third of the axial lengths H1 and H2. Specifically, the sum of the extension length L1 of the side wall portion 320 and the thickness T1 of the base portion 310 and the sum of the extension length L2 of the side wall portion 420 and the thickness T2 of the base portion 410 are both greater than or equal to 3.0 mm (millimeter, mm), and can be applied. For the miniaturized transformer structure 1.

In addition, in order to provide a sufficient spatial distance between the first coil 120 and the second coil 220 and not to reduce the transformation efficiency of the first insulating sleeve 30 and the second insulating sleeve 40, it is necessary to appropriately configure the thickness of the base portions 310 and 410. . When the sum of the thicknesses of the base portion 310 and the base portion 410 is T, the inductance of the first coil 120 is L, the number of turns of the first coil 120 is N, the cross-sectional area of the first core 130 is A, and the magnetic flux of the first core 130 The conductivity is μ, which satisfies the following condition: LT = (N2)Aμ. In the present embodiment, the sum of the thicknesses of the base portion 310 and the base portion 410 is 0.4 mm or more, and it can be applied to the miniaturized transformer structure 1. In this embodiment, the thicknesses of the base portions 310 and 410 are designed according to the above conditions to achieve sufficient space distance and good transformation efficiency, but the application of the above conditional expression is not limited thereto. For example, when the transformer structure 1 is applied to a resonant circuit (LLC Topology), the thicknesses of the bases 310 and 410 can be designed via the above-described conditional formula to produce a desired leakage inductance. In the present embodiment, the first coil 120 surrounds the central portion 131 of the first magnetic core 130, so that the cross-sectional area of the first magnetic core 130 refers to the central portion 131 in the radial direction (the direction of the vertical axis C). Cross-sectional area.

In addition, in the present embodiment, the thickness T1 of the base portion 310 of the first insulating sleeve 30 is equal to the thickness D1 of the side wall portion 320, and the thickness T2 of the base portion 410 of the second insulating sleeve 40 is equal to the thickness D2 of the side wall portion 420, and It helps to simplify the manufacturing steps and reduce the manufacturing cost, but the invention is not limited thereto. In other embodiments, the thickness of the base may not be equal to the thickness of the sidewall portions.

Another aspect of the transformer structure is disclosed below. 2 is a perspective view of a transformer structure in accordance with a second embodiment of the present invention. Since the second embodiment is similar to the first embodiment, the following description will be made only on the difference.

In the present embodiment, the transformer structure 1a includes two insulating sleeves 50. The two insulating sleeves 50 are respectively sleeved on the first bobbin 110 and the second bobbin 210, and the base 510 of the two insulating sleeves 50 is only between the first bobbin 110 and the second bobbin 210. For example, the insulating sleeve 50 of the insulating sleeve 50 accommodates only the first bobbin 110, the first coil 120 and the central portion 131 of the first core 130, and is first. The extension 132 of the magnetic core 130 is exposed to the outside.

The transformer structure of yet another aspect is disclosed below. 3A is a perspective view of a transformer structure in accordance with a third embodiment of the present invention. 3B is a cross-sectional view showing the structure of the transformer of FIG. 3A. Since the third embodiment is similar to the first embodiment, the following description will be made only on the difference.

In this embodiment, the transformer structure 1b includes two insulating sleeves 60 that are respectively sleeved on the first winding module 10 and the second winding module 20. The side wall portion 620 of the insulating sleeve 60 of the first winding module 10 has an extension length equal to one half of the axial length of the first winding shaft 110, and is sleeved on the insulating sleeve 60 of the second winding module 20. The length of the side wall portion 620 is equal to one half of the axial length of the second bobbin 210.

The transformer structure of another aspect is disclosed below. 4 is a perspective view showing the structure of a transformer according to a fourth embodiment of the present invention. Since the third embodiment is similar to the first embodiment, the following description will be made only on the difference.

Compared with the first embodiment, the transformer structure 1c of the present embodiment only includes the first insulating sleeve 30 sleeved on the first winding module 10, and the second winding module 20 is not sleeved. In order to ensure a sufficient spatial distance, the thickness of the base portion 310 of the first insulating sleeve 30 of the present embodiment is greater than the thickness of the base portion 310 of the first insulating sleeve 30 of the first embodiment.

In summary, in the transformer structure disclosed in the present invention, the insulating sleeve includes a base portion and a side wall portion circumferentially connected to the base portion. A portion of the first bobbin, a portion of the first coil and a portion of the first core are located in a receiving groove formed by the base portion and the side wall portion, and the base portion is interposed between the first bobbin and the second bobbin. By arranging the insulating sleeve, the base helps to make the spatial distance between the first coil and the second coil more suitable to meet the requirements of miniaturization and electrical safety, and the side wall portion helps to increase between the first coil and the second coil The creeping distance. Thereby, the insulating sleeve helps to improve electrical safety, and also avoids excessive spacing between the first winding module and the second winding module, and can maintain the miniaturization of the transformer structure.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1, 1a, 1b, 1c‧‧‧ transformer structure
10‧‧‧First winding module
110‧‧‧First bobbin
120‧‧‧First coil
130‧‧‧First core
131‧‧‧ Central Department
132‧‧‧Extension
20‧‧‧Second winding module
210‧‧‧second bobbin
220‧‧‧second coil
230‧‧‧second core
231‧‧‧ Central Department
232‧‧‧Extension
30‧‧‧First insulating sleeve
310‧‧‧ base
311‧‧‧ inner surface
312‧‧‧ outer surface
320‧‧‧ Sidewall
330‧‧‧ accommodating slots
40‧‧‧Second insulation sleeve
410‧‧‧ base
411‧‧‧ inner surface
412‧‧‧ outer surface
420‧‧‧ Sidewall
430‧‧‧ accommodating slots
50, 60‧‧ ‧ insulating sleeve
510‧‧‧ base
530‧‧‧ accommodating slots
620‧‧‧ Side wall
A‧‧‧ cross-sectional area
C‧‧‧Axis
H1, H2‧‧‧ axial length
L1, L2‧‧‧ extended length
N‧‧‧匝
The sum of the thickness of the base of T‧‧‧
T1, T2, D1, D2‧‧‧ thickness μ‧‧‧ magnetic permeability

1A is a perspective view of a transformer structure in accordance with a first embodiment of the present invention. FIG. 1B is an exploded perspective view of the transformer structure of FIG. 1A. 1C is a schematic cross-sectional view of the transformer structure of FIG. 1A. 2 is a perspective view of a transformer structure in accordance with a second embodiment of the present invention. 3A is a perspective view of a transformer structure in accordance with a third embodiment of the present invention. 3B is a schematic cross-sectional view showing the structure of the transformer of FIG. 3A. 4 is a perspective view showing the structure of a transformer according to a fourth embodiment of the present invention.

Claims (10)

A transformer structure comprising: a first winding module comprising a first winding shaft, a first coil and a first magnetic core, the first magnetic core comprising a first central portion, the first coil is wound around The first bobbin is sleeved on the first central portion; a second winding module includes a second bobbin, a second coil and a second core, the second The magnetic core includes a second central portion, the second coil is wound around the second bobbin, and the second bobbin is sleeved on the second central portion; and at least one insulating sleeve is sleeved on the first bobbin The at least one insulating sleeve includes a base portion and a side wall portion, the side wall portion is circumferentially connected to the base portion to form a receiving groove, at least a portion of the first bobbin, at least a portion of the first coil and a portion of the first magnetic portion The first central portion of the core is located in the receiving groove, and the base portion is between the first winding shaft and the second winding shaft and between the first central portion and the second central portion. The transformer structure of claim 1, wherein the first magnetic core and the second magnetic core further comprise two extensions, wherein the first winding axis is between the two extensions of the first magnetic core The second bobbin is interposed between the two extensions of the second magnetic core, and the at least one insulating sleeve is sleeved on the two extensions of the first magnetic core, at least part of the first magnetic core a central portion and at least a portion of the two extensions of the first magnetic core are located in the receiving groove, and the base portion is between the two extension portions of the first magnetic core and the two extension portions of the second magnetic core between. The transformer structure of claim 1, wherein the first bobbin and the second bobbin are substantially coaxial with each other, and the side wall portion of the at least one insulating sleeve is oriented from the base along the axis The first bobbin extends away from one end of the second bobbin. The transformer structure of claim 3, wherein the sidewall portion has an extension length greater than or equal to one-half of an axial length of the first bobbin. The transformer structure of claim 4, wherein the sidewall portion has an extension length greater than or equal to an axial length of the first bobbin. The transformer structure of claim 3, wherein the sum of the extension length of the side wall portion and the thickness of the base portion is greater than or equal to 3.0 millimeters. The transformer structure of claim 1, wherein the number of the at least one insulating sleeve is two, and the two insulating sleeves are respectively sleeved on the first winding shaft and the second winding shaft, and the two insulating sleeves are respectively The two bases are between the first bobbin and the second bobbin and are between the first central portion and the second central portion. The transformer structure of claim 7, wherein the sum of the thicknesses of the two bases is greater than or equal to 0.4 mm. The transformer structure of claim 7, wherein the sum of the thicknesses of the two bases is T, the inductance of the first coil is L, the number of turns of the first coil is N, and the cut of the first core The area is A, and the magnetic permeability of the first core is μ, which satisfies the following condition: LT = (N ² ) Aμ. The transformer structure of claim 1, wherein the thickness of the base of the at least one insulating sleeve is equal to the thickness of the side wall portion.