Planar Transformer

Abstract

The present invention provides a planar transformer, comprising: a housing (Ca), including a housing body (310) and a cover (320), wherein the cover (320) is connected to the housing body (310) in a detachable manner to open and close the installation space (S1) of the housing body (310); a flat primary coil element (100) is inserted into the installation space (S1) of the housing body (310); a secondary coil element (200) is inserted into the installation space (S1) of the housing body (310) and generates an induced current by applying a current to the primary coil element (100). In addition, the secondary coil element (200) and the primary coil element (100) are simultaneously installed in the installation space (S1) of the housing body (310) closed by the cover (320), thereby having the advantages of improving the combination efficiency and reducing the thickness of the transformer.

Description

Technical Field

[0001] The present invention relates to a planar transformer used for a charger of a portable terminal device or a tablet computer. Background Art

[0002] Generally, a transformer has a primary coil and a secondary coil. Generally, the primary coil is used as an input terminal, and the secondary coil is used as an output terminal.

[0003] As a technology of planar transformer used in chargers of portable terminal devices or tablet computers, Korean registered patent No. 10-1579427 (publication date: 2015.12.22.) is "Transformer".

[0004] The technology of the above-mentioned registered patent No. 10-1579427 is a technology in which the secondary coil of the transformer is formed by insert molding a metal stamping, and a primary coil element, that is, a PCB substrate having stacked coils, is inserted between a pair of secondary coils.

[0005] However, the prior art as described above has the following problems.

[0006] The technology of No. 10-1579427 is to shape a metal sheet by stamping, drawing and bending, and then fix the shape of the coil by primary insert molding, and improve durability by casting through secondary insert molding, thereby manufacturing a secondary coil molding (secondary coil element), and the primary coil is manufactured into a PCB shape, which are stacked separately to manufacture a transformer. Therefore, there is a problem of low efficiency due to the heat caused by the small cross-sectional area of ​​the primary coil PCB and the large distance between the primary and secondary coils.

[0007] Prior art literature

[0008] Patent Literature

[0009] Document 1: Patent Registration Gazette No. 10-1579427 (Announcement date: 2015.12.22)

[0010] Document 2: Patent Publication No. 10-2016-0041837 (Publication Date: 2016.04.18) Summary of the invention

[0011] Technical problem to be solved by the invention

[0012] The present invention is developed to solve the above-mentioned prior art problems. The purpose of the planar transformer of the present invention is to provide a planar transformer.

[0013] First, the primary coil element and the secondary coil element are joined to each other and installed in a housing, so that the space occupied by the primary coil element and the secondary coil element is small, thereby realizing miniaturization of the transformer product. In addition, the distance between the primary coil element and the secondary coil element is narrow, and the thickness of the transformer is thinned, thereby realizing ultra-thin products.

[0014] Second, the distance between the primary coil element and the secondary coil element is narrowed to increase the magnetic coupling force between the primary coil element and the secondary coil element, thereby improving the coupling efficiency.

[0015] Third, by simultaneously installing the primary coil element and the secondary coil element in one housing, the assembly workability of the transformer product is improved, and productivity is increased.

[0016] Fourth, the primary coil element and the secondary coil element are incorporated into the housing, and the insulation from the outside is excellent.

[0017] Fifth, a housing is selected as a structure for connecting the primary coil element and the secondary coil element, whereby an impregnation liquid (insulating liquid) is injected into the interior of the housing so that the primary coil element and the secondary coil element built into the housing are impregnated with the insulating liquid.

[0018] Sixth, by connecting the cover to the housing body by pressing the primary coil element and the secondary coil element, the primary coil element and the secondary coil element are tightly attached and pressed without any gap or floating between them, thereby making the product thinner and having better bonding strength.

[0019] Seventh, a triple insulation coil or a quadruple insulation coil is selected as the secondary coil component, thereby saving product cost compared with the existing stamping and casting type coil component.

[0020] Eighth, even if a triple insulation coil or a quadruple insulation coil is selected as the secondary coil element, the triple insulation coil or the quadruple insulation coil and the primary coil element are all installed in the housing. Thus, since no additional connecting parts are selected, the assembly workability and productivity can be improved.

[0021] Ninth, the secondary first coil element, the primary coil element, and the secondary second coil element are sequentially stacked in the order of being formed inside the housing, and in particular, the insulation between the secondary first coil element and the lower magnetic core is improved, and the insulation between the secondary second coil element and the upper magnetic core is improved,

[0022] Tenth, the primary coil element and the secondary coil element are simultaneously inserted between the inner guide and the outer guide and held, thereby, with a simple structure, the primary coil element and the secondary coil element are stably and firmly installed in the housing without end gaps or movement.

[0023] Eleventh, the steel wires of each main coil part and auxiliary coil part are connected to the primary terminal pin by means of the steel wire passing groove, thereby preventing contact or short circuit between the steel wires and facilitating the connection work (improving the connection workability).

[0024] Twelfth, the wires are tied stably in a state where the wires of the main coil and the auxiliary coil are separated and do not touch each other.

[0025] Thirteenth, the wires of the main coil part or the auxiliary coil part are separated from each other and the wires are tied stably without contacting each other.

[0026] Fourteenth, the cover and the housing body are firmly connected by a structure in which the front and rear sides are connected at the same time. In particular, the rear connection protrusion is connected to the rear insertion groove in the front-to-rear direction, so that the end gap or movement of the primary coil element and the secondary coil element stacked in sequence in the vertical direction can be accurately grasped.

[0027] Fifteenth, by selecting a method of connecting the cover to the shell body by elastic force and hooking, when only the front connection protrusion is pressed down, the elastic hook connection is performed with a click, thereby making the connection convenient, fast and firm.

[0028] Sixteenth, when the wire passing groove is used as a guide groove for tying the wire, it can also be used as a connecting groove, thereby saving the manufacturing cost of the product.

[0029] Seventeenth, the impregnation liquid (insulating liquid) is filled into the interior of the shell and hardened, thereby forming the primary coil element, the secondary coil element and the shell as one body, and at the same time, preventing the noise generated by the vibration of the coil element during operation due to the application of current and appropriately improving the insulation characteristics.

[0030] Technical solutions to solve problems

[0031] The planar transformer of the present invention for achieving the above-mentioned purpose includes: a shell: including a shell body and a cover; a flat primary coil element, which is inserted into the installation space set in the shell body; a secondary coil element, which is in contact with the primary coil element, is inserted into the installation space set in the shell body, and generates an induced current by applying current to the primary coil element, wherein the shell body is used to form the installation space; the cover is connected to the shell body in a detachable manner to open and close the installation space of the shell body, and in addition, the secondary coil element and the primary coil element are simultaneously loaded into the installation space of the shell body closed by the cover.

[0032] Effects of the Invention

[0033] The planar transformer of the present invention having the above-described structure has the following effects.

[0034] First, the primary coil element and the secondary coil element are joined to each other and installed in a housing, so that the space occupied by the primary coil element and the secondary coil element is small, thereby realizing miniaturization of the transformer product. In addition, the distance between the primary coil element and the secondary coil element is narrow, and the thickness of the transformer is thinned, thereby realizing ultra-thin products.

[0035] Second, the distance between the primary coil element and the secondary coil element is narrowed to increase the magnetic coupling force between the primary coil element and the secondary coil element, thereby improving the coupling efficiency.

[0036] Third, by simultaneously installing the primary coil element and the secondary coil element in one housing, the assembly workability of the transformer product is improved, and productivity is increased.

[0037] Fourth, the primary coil element and the secondary coil element are incorporated into the housing, and the insulation from the outside is excellent.

[0038] Fifth, a housing is selected as a structure for connecting the primary coil element and the secondary coil element, whereby an impregnation liquid (insulating liquid) is injected into the interior of the housing so that the primary coil element and the secondary coil element built into the housing are impregnated with the insulating liquid.

[0039] Sixth, by connecting the cover to the housing body by pressing the primary coil element and the secondary coil element, the primary coil element and the secondary coil element are tightly attached and pressed without any gap or floating between them, thereby making the product thinner and having better bonding strength.

[0040] Seventh, a triple insulation coil or a quadruple insulation coil is selected as the secondary coil component, thereby saving product cost compared with the existing stamping and casting type coil component.

[0041] Eighth, even if a triple insulation coil or a quadruple insulation coil is selected as the secondary coil element, the triple insulation coil or the quadruple insulation coil and the primary coil element are all installed in the housing. Thus, since no additional connecting parts are selected, the assembly workability and productivity can be improved.

[0042] Ninth, the secondary first coil element, the primary coil element, and the secondary second coil element are sequentially stacked in this order inside the housing, thereby, in particular, improving the insulation between the secondary first coil element and the lower magnetic core, and improving the insulation between the secondary second coil element and the upper magnetic core,

[0043] Tenth, the primary coil element and the secondary coil element are simultaneously inserted between the inner guide and the outer guide and held, thereby, with a simple structure, the primary coil element and the secondary coil element are stably and firmly installed in the housing without end gaps or movement.

[0044] Eleventh, the steel wires of each main coil part and auxiliary coil part are connected to the primary terminal pin by means of the steel wire passing groove, thereby preventing contact or short circuit between the steel wires and facilitating the connection work (improving the connection workability).

[0045] Twelfth, the wires are tied stably in a state where the wires of the main coil and the auxiliary coil are separated and do not touch each other.

[0046] Thirteenth, the wires of the main coil part or the auxiliary coil part are separated from each other and the wires are tied stably without contacting each other.

[0047] Fourteenth, the cover and the housing body are firmly connected by a structure in which the front and rear sides are connected at the same time. In particular, the rear connection protrusion is connected to the rear insertion groove in the front-to-rear direction, so that the end gap or movement of the primary coil element and the secondary coil element stacked in sequence in the vertical direction can be accurately grasped.

[0048] Fifteenth, by selecting a method of connecting the cover to the shell body by elastic force and hooking, when only the front connection protrusion is pressed down, the elastic hook connection is performed with a click, thereby making the connection convenient, fast and firm.

[0049] Sixteenth, when the wire passing groove is used as a guide groove for tying the wire, it can also be used as a connecting groove, thereby saving the manufacturing cost of the product.

[0050] Seventeenth, the impregnation liquid (insulating liquid) is filled into the interior of the shell and hardened, thereby forming the primary coil element, the secondary coil element and the shell as one body, and at the same time, preventing the noise generated by the vibration of the coil element during operation due to the application of current and appropriately improving the insulation characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a three-dimensional diagram of a planar transformer A according to an embodiment of the present invention;

[0052] Figure 2 is an exploded perspective view of a planar transformer A according to an embodiment of the present invention;

[0053] Figure 31 is a perspective view of a case Ca in which a secondary first coil element 210, a primary coil element 100, and a secondary second coil element 220 are sequentially stacked and built in a planar transformer A according to an embodiment of the present invention. Figure 3 (a) is the rear stereogram, Figure 3 (b) is a front stereoscopic view.

[0054] Figure 4 is an exploded perspective view of a primary coil element 100 of a planar transformer A according to an embodiment of the present invention;

[0055] Figure 5 FIG. 1 is a three-dimensional diagram of a planar transformer A and a housing Ca according to an embodiment of the present invention. Figure 5 (a) is a three-dimensional view of the cover 320, Figure 5 (b) is a three-dimensional view of the housing body 310;

[0056] Figure 6 FIG. 1 is a bottom perspective view of a case Ca of a planar transformer A according to an embodiment of the present invention. Figure 6 (a) is a bottom perspective view of the cover 320, Figure 6 (b) is a bottom perspective view of the housing body 310;

[0057] Figure 7 This is an example diagram of the planar transformer A according to one embodiment of the present invention, in which the steel wire 110k of the main coil portion and the steel wire 130k of the auxiliary coil portion are connected through the steel wire passing slots 332a and 332b.

[0058] Description of Reference Numerals

[0059] A: A transformer having both a primary coil element and a secondary coil element built therein according to an embodiment of the present invention

[0060] 100: primary coil element 100a: central through hole of primary coil element

[0061] 100a': Inner peripheral surface of the primary coil element 100b: Outer peripheral surface of the primary coil element

[0062] 110: main coil part 110a: first hollow

[0063] 110k: Steel wire for the main coil

[0064] 121: upper double-sided adhesive film 121a: first through hole

[0065] 122: lower double-sided adhesive film 122a: second through hole

[0066] 130: auxiliary coil part 130a: second hollow

[0067] 130k: Steel wire for auxiliary coil

[0068] 141: upper shielding coil portion 141a: first central hole

[0069] 142: lower shielding coil portion 142a: second central hole

[0070] 200: Secondary coil components

[0071] 210: Secondary first coil element

[0072] 210a: Central through hole of the secondary first coil element

[0073] 210a': Inner circumference of the secondary first coil element

[0074] 210b: Outer peripheral surface of the secondary first coil element

[0075] 220: Secondary second coil element

[0076] 220a: Central through hole of the secondary second coil element

[0077] 220a': Inner circumference of the secondary second coil element

[0078] 220b: Outer peripheral surface of the secondary second coil element

[0079] Ca: Capsid

[0080] S1: Installation space of the housing

[0081] 310: Shell body

[0082] 311: Bottom of the housing body

[0083] 311a: Lower through hole

[0084] 311b: first lead-out groove

[0085] 312: Outer guide

[0086] 313:Inside guide

[0087] 320: Lid

[0088] 320a: Upper through hole

[0089] 320b: second lead-out groove

[0090] 321: Front connection protrusion

[0091] 321a: Card table

[0092] 321b: Guide surface

[0093] 322: Cutting groove

[0094] 323: Front insertion bulge

[0095] 325: Rear connection protrusion

[0096] 326: Rear insertion protrusion

[0097] 326a: Recessed groove

[0098] 331, 331': primary terminal block

[0099] 331a: Card hanging end

[0100] 331b: inclined guide surface

[0101] 332a, 332b: Steel wire passing slot

[0102] 335a: first guide protrusion

[0103] 335b: Second guide protrusion

[0104] 345: Rear insertion groove

[0105] 346: Rear recessed groove

[0106] 351: Lead out groove

[0107] P1: primary terminal pin

[0108] 410: Lower core

[0109] 410a: Lower endopod

[0110] 410b: Lower outer foot

[0111] 420: Upper core

[0112] 420b:Upper exopod

[0113] 500: Base

[0114] 511: Terminal connection hole

[0115] 513: Lead-out hole DETAILED DESCRIPTION

[0116] Preferred embodiments of the planar transformer of the present invention will be described in detail below with reference to the accompanying drawings.

[0117] The planar transformer of the present invention refers to a transformer having both a primary coil element and a secondary coil element built therein.

[0118] A planar transformer A according to an embodiment of the present invention comprises: a housing Ca, comprising: a housing body 310 and a cover 320; a flat primary coil element 100, inserted into an installation space S1 set in the housing body 310, and generating an induced current in a secondary coil element 200 when a driving current is applied from a main substrate of a finished product (e.g., a charger); a secondary coil element 200, inserted into an installation space S1 set in the housing body 310 in contact with the primary coil element 100, and generating an induced current by applying a current to the primary coil element 100, wherein the secondary coil element 200 and the primary coil element 100 are simultaneously loaded into an installation space S1 set in the housing body 310 closed by the cover 320, wherein the housing body 310 is provided to form the installation space S1; and the cover 320 is detachably connected to the housing body 310 in a manner of opening and closing the installation space S1 of the housing body 310 from the top.

[0119] Thus, the primary coil element 100 and the secondary coil element 200 are closely attached to each other and arranged in one housing Ca, thereby having the advantages of reducing the space occupied by the primary coil element and the secondary coil element 100, 200 and narrowing the interval between the primary coil element 100 and the secondary coil element 200, thereby thinning the thickness of the entire transformer A and achieving an ultra-thin product.

[0120] Furthermore, since the interval between the primary coil element 100 and the secondary coil element 200 is narrowed, there is also an advantage of improving the coupling force.

[0121] Furthermore, by simultaneously incorporating the primary coil element 100 and the secondary coil element into one case Ca, there is an advantage that the assembly workability of the transformer product is improved, and productivity is improved.

[0122] Furthermore, since the primary coil element 100 and the secondary coil element are housed in the case Ca, there is an advantage that the insulation from the outside is excellent.

[0123] Furthermore, when the impregnation liquid (insulating liquid) is injected into the case Ca, the primary coil element and the secondary coil element 100 , 200 housed in the case Ca can also be impregnated.

[0124] The primary coil element 100 and the secondary coil element 200 are installed tightly together. For this purpose, preferably, the cover 320 presses [pressurizes] the primary coil element 100 and the secondary coil element 200 downward at the same time, and can also be connected to the shell body 310 in a detachable manner.

[0125] Thus, the cover 320 presses the primary coil element and the secondary coil element 100 , 200 , and the primary coil element 100 and the secondary coil element 200 are closely attached and pressed without any gap or floating between them, thereby having the advantages of being thinner and having excellent characteristics.

[0126] Also, preferably, the secondary coil element 200 is formed of a triple insulated winding wire formed by winding a triple insulated wire in a spiral shape, or a quadruple insulated winding wire formed by winding a quadruple insulated wire in a spiral shape.

[0127] Hereinafter, the triple-insulated steel wire and the quadruple-insulated steel wire are simply referred to as "triple-quadruple-insulated steel wire", and the triple-insulated coil and the quadruple-insulated coil are simply referred to as "triple-quadruple-insulated coil".

[0128] Therefore, by selecting a triple insulation coil or a quadruple insulation coil as the secondary coil component, there is an advantage of significantly reducing the product cost compared with the existing stamping and casting type coil component.

[0129] Furthermore, even if a triple insulated coil or a quadruple insulated coil is selected as the secondary coil element 200, since the triple insulated coil or the quadruple insulated coil and the primary coil element are all housed in the housing, there is no need to select an additional connecting component, thereby having the advantage of improving assembly workability and productivity.

[0130] Here, the secondary coil element 200 includes: a secondary first coil element 210, which is in contact with one side (for example, based on the bottom of the drawing) of the primary coil element 100 and is inserted and arranged in the installation space S1; a secondary second coil element 220, which is in contact with the other side (for example, based on the top of the drawing) of the primary coil element 100 and is inserted and arranged in the installation space S1. In addition, the secondary first coil element 210, the primary coil element 100 and the secondary second coil element 220 are stacked in sequence and built into the shell Ca.

[0131] In addition, the secondary first coil element 210 and the secondary second coil element 220 may be connected in parallel or in series, and either case is also within the technical scope of the present invention.

[0132] Furthermore, the secondary first coil element 210 is inserted and arranged in the installation space S1 in contact with one side (for example, based on the bottom of the drawing) of the primary coil element 100, and is composed of a triple insulation coil or a quadruple insulation coil in which triple insulation steel wire or quadruple insulation steel wire is wound into a spiral shape.

[0133] Similarly, the secondary second coil element 220 is inserted into the installation space S1 to contact the other side (for example, the upper side based on the drawing) of the primary coil element 100 and is formed by winding triple insulated steel wire or quadruple insulated steel wire into a spiral triple insulated coil or quadruple insulated coil.

[0134] Furthermore, the secondary first coil element 210 of the triple insulation coil or quadruple insulation coil, the primary coil element 100, and the secondary second coil element 220 of the triple insulation coil or quadruple insulation coil are sequentially stacked and housed in the case Ca.

[0135] As described above, the secondary first coil element 210, the primary coil element 100 and the secondary second coil element 220 are sequentially stacked inside the shell Ca in this order, and in particular, there are advantages in improving the insulation between the secondary first coil element 210 and the lower magnetic core 410, and improving the insulation between the secondary second coil element 220 and the upper magnetic core 420.

[0136] Furthermore, preferably, the primary coil element 100 includes: a main coil portion 110, a first hollow core 110a is formed in the center, and the conductive steel wires of the insulating coating are in contact with each other and wound into a plane; an auxiliary coil portion 130, which is arranged above or below the main coil portion 110, and a second hollow core 130a is formed in the center in a manner connected to the first hollow core 110a of the main coil portion 110, and the conductive steel wires of the insulating coating are in contact with each other and wound into a plane, and an induced voltage is generated through electromagnetic induction with the main coil portion 110 and output.

[0137] As described above, the primary coil element 100 is implemented in a flat plate shape and reduced in size so that the copper wires of the insulation coating are in contact with each other.

[0138] Furthermore, it also includes conductive shielding members 141 and 142 which are arranged in contact with the main coil unit 110 and form central holes 141a and 142a in a manner of communicating with the first hollow core 110a, and are formed in a flat plate shape to shield EMI (Electro Magnetic Interference).

[0139] The shielding parts 141 and 142 are composed of a conductive upper shielding part 141 and a conductive lower shielding part 142, wherein the conductive upper shielding part 141 is arranged in contact with the upper surface of the main coil part 110, and a central hole 141a is formed in the center in a manner connected to the first hollow core 110a, and is formed in a flat plate shape to shield EMI; the conductive lower shielding part 142 is arranged in contact with the lower surface of the main coil part 110, and a central hole 142a is formed in the center in a manner connected to the first hollow core 110a, and is formed in a flat plate shape to shield EMI.

[0140] Here, the auxiliary coil part 130 is disposed in contact between the main coil part 110 and the upper shielding member 141 or between the main coil part 110 and the lower shielding member 142 , thereby generating an induced voltage in the main coil part 110 through electromagnetic induction.

[0141] Preferably, the upper shielding member 141 is arranged in contact with the upper surface of the main coil portion 110 to form a first central hole 141a in communication with the first hollow core 110a, and is configured to shield the steel wires with insulating coatings in contact with each other and wound to form an upper shielding coil portion 141 of EMI in a flat plate shape.

[0142] And, preferably, the lower shielding part 142 is arranged in contact with the bottom of the main coil part 110 to form a second central hole 142a in a manner connected to the first hollow 110a, constituting the lower shielding coil part 142 of EMI which is wound into a flat plate by shielding the steel wires with insulating coatings that are in contact with each other.

[0143] In addition, as described above, the upper shielding member 141 and the lower shielding member 142 are formed by winding the insulating coated steel wire into a flat plate, but are not limited to this. For example, they can be composed of a shielding copper foil gasket [for example, a thin copper plate or copper glue (copper foil tape)] (not shown) that forms a central hole in the center and shields EMI, or can also be composed of a shielding fiber gasket (not shown) that forms a central hole and shields EMI.

[0144] In addition, the primary coil element 100 further includes: an upper insulating gasket 121, which is arranged in contact between the main coil portion 110 and the upper shielding member 141, and has a first through hole 121a formed in the center thereof and connected to the first hollow core 110a; and a lower insulating gasket 122, which is arranged in contact between the main coil portion 110 and the lower shielding member, and has a second through hole 122a formed in the center thereof and connected to the first hollow core 110a.

[0145] Here, the auxiliary coil part 130 is disposed in contact with the upper insulating spacer 121 and the upper shielding member, or is disposed in contact with the lower insulating spacer 122 and the lower shielding member, and generates an induced voltage in the main coil part 110 through electromagnetic induction.

[0146] As a result, the insulation withstand voltage increases, the interval between the coil parts decreases, and the size of the product is further reduced.

[0147] In the illustrated drawings, the auxiliary coil portion 130 is shown in contact with the upper insulating spacer 121 and the upper shielding coil portion 141 as an example.

[0148] Preferably, the upper insulating spacer 121 is formed of an upper double-sided adhesive film 121 forming an adhesive layer. This has the advantages of improving the assembly performance by bonding between the main coil part 110 and the auxiliary coil part 130 and improving the insulation performance.

[0149] Furthermore, the lower insulating spacer 122 is formed of a lower double-sided adhesive film 122 forming an adhesive layer. Thus, the bonding assembly performance between the main coil portion 110 and the lower shielding coil portion 142 is improved.

[0150] The main coil portion 110, the auxiliary coil portion 130 and the upper shielding coil portion 141 of the primary coil element 100 are insulated by an insulating coating material (for example, polyurethane enamel), and an adhesive layer (composite layer) is additionally coated on the insulating coating of the auxiliary coil portion 130 and the upper shielding coil portion 141 coated with the insulating coating material, and then heat is applied (primary heating) to melt the applied adhesive layer and then harden it, thereby the auxiliary coil portion 130 and the upper shielding coil portion 141 are heat-fused to each other, and the main coil portion 110, the upper double-sided adhesive film 121, the heat-fused auxiliary coil portion 130 and the upper shielding coil portion 141 are stacked in sequence, and heat is applied (secondary heating) to the main coil portion 110, the upper double-sided adhesive film 121, the heat-fused auxiliary coil portion 130 and the upper shielding coil portion 141 stacked in sequence to melt the adhesive layer (adhesive) and harden it, thereby forming a coil group of the fixed primary coil element 100.

[0151] Furthermore, the lower shielding coil portion 142, the main coil portion 110, the auxiliary coil portion 130 and the upper shielding coil portion 141 of the primary coil element 100 are insulated by an insulating coating material (for example, polyurethane enamel), and an adhesive layer (composite layer) is additionally applied on the insulating coating of the auxiliary coil portion 130 and the upper shielding coil portion 141 coated with the insulating coating material, and then heat (primary heating) is applied to melt the coated adhesive layer and harden it, thereby, the auxiliary coil portion 130 and the upper shielding coil portion 141 are thermally welded to each other, and the lower layers are stacked in sequence. The lower shielding coil portion 142, the lower double-sided adhesive film 122, the main coil portion 110, the upper double-sided adhesive film 121, the heat-melted auxiliary coil portion 130 and the upper shielding coil portion 141 are stacked in sequence, and heat (secondary heating) is applied to the lower shielding coil portion 142, the lower double-sided adhesive film 122, the main coil portion 110, the upper double-sided adhesive film 121, the heat-melted auxiliary coil portion 130 and the upper shielding coil portion 141 to melt the adhesive layer (adhesive) and harden them, thereby forming a coil group that shapes the primary coil element 100.

[0152] The shell body 310 further includes: a flat bottom 311, which is connected to the central through hole 100a of the primary coil element 100 and forms a lower through hole 311a in the center in a manner for inserting the lower magnetic core 410; an outer guide 312, which protrudes upward from the edge of the bottom 311 and is used to grab the outer peripheral surfaces 100b, 210b, 220b of the primary coil element and the secondary coil element 100, 200; an inner guide 313, which contacts the inner peripheral surfaces 100a', 210a', 220a' of the central through holes 100a, 210a, 220a of the primary coil element and the secondary coil element 100, 200 and grabs the primary coil element and the secondary coil element The inner circumferential surfaces 100a', 210a', 220a' of the central through holes 100a, 210a, 220a of the secondary coil elements 100, 200 are formed to protrude upward from the edge of the lower through hole 311a; the upper through hole 320a, corresponding to the lower through hole 311a, is formed in the cover 320 in a manner for inserting the upper magnetic core 420. In addition, the installation space S1 is formed between the inner guide 313 and the outer guide 312. The primary coil element and the secondary coil element 100, 200 are arranged at the bottom 311 of the shell body 310 and are inserted and retained between the inner guide 313 and the outer guide 312.

[0153] The secondary first coil element 210 is arranged at the bottom 311 , the primary coil element 100 is stacked with the secondary first coil element 210 , and the secondary second coil element 220 is stacked with the primary coil element 100 , thereby, the secondary first coil element 210 , the primary coil element 100 , and the secondary second coil element 220 are sequentially stacked on the shell Ca.

[0154] As described above, the primary and secondary coil elements 100 and 200 are inserted and held between the inner guide 313 and the outer guide 312 , so that the primary and secondary coil elements 100 and 200 are stably and firmly incorporated into the case Ca without any end play or movement.

[0155] Furthermore, the situation in which the secondary first coil element 210, the primary coil element 100, and the secondary second coil element 220 are inserted and held between the inner guide 313 and the outer guide 312 means that the inner guide 313 contacts the inner circumferential surfaces 100a', 210a', 220a' of the central through holes 100a, 210a, 220a of the primary and secondary coil elements 100, 200 and grasps the inner circumferential surfaces 100a', 210a', 220a' of the central through holes 100a, 210a, 220a of the primary and secondary coil elements 100, 200, and the outer guide 312 contacts the outer circumferential surfaces 100b, 210b, 220b of the primary and secondary coil elements 100, 200 and grasps the outer circumferential surfaces 100b, 210b, 220b of the primary and secondary coil elements 100, 200.

[0156] It also includes: a plurality of primary terminal blocks 331, 331', which are integrally formed with the bottom 311 at one end (for example, the front end) of the bottom 311 for connecting a primary terminal pin P1; a plurality of, for example, four terminal pins P1, which are connected to the primary terminal blocks 331, 331' and connected to the primary coil element 100, and in addition, steel wire passing grooves 332a, 332b are formed between the plurality of primary terminal blocks 331, 331' and the primary terminal blocks 331, 331', and the steel wire 110k of the main coil portion 110 and the steel wire 130k of the auxiliary coil portion 130 are connected to the terminal pin P1 through the steel wire passing grooves 332a, 332b.

[0157] As described above, the steel wires 110k and 130k of the main coil portion 110 and the auxiliary coil portion 130 are connected to the primary terminal pin P1 through the steel wire passing grooves 332a and 332b, thereby preventing contact or short circuit between the steel wires 110k and 130k and facilitating the connection operation.

[0158] In addition, the steel wires of the upper and lower shielding coil portions 141 and 142 are connected to, for example, the primary terminal pins of the auxiliary wire-connecting coil portion 130 or the primary terminal pins of the main wire-connecting coil portion 110 .

[0159] It also includes: a first guide protrusion 335a, which is formed to protrude upward from the bottom 311 in a manner that is directly behind the steel wire passing groove 332a between the outer peripheral surface of the primary coil element 100 and the primary terminal station 331, and the steel wire 110k of the main coil part 110 and the steel wire 130k of the auxiliary coil part 130 are guided by connecting the wires through the adjacent primary terminal pin P1, and are not in contact with each other and are separated, and are guided to the primary terminal pin P1 by means of the steel wire passing groove 332a.

[0160] Thus, there is an advantage that the wire connection is stabilized when the wire 110 k of the main coil portion 110 and the wire 130 k of the auxiliary coil portion 130 are separated from each other and do not contact each other.

[0161] Furthermore, it also includes: a second guide protrusion 335b, which is formed by protruding upward from the bottom 311 in a manner that it is directly behind the steel wire passing groove 332b between the outer peripheral surface of the primary coil element 100 and the primary terminal stage 331, 331'. Specifically, it is formed by being separated to the left and right sides by the first guide protrusion 335a and protruding from the bottom 311, and the steel wires 110k of the main coil part 110 are not in contact with each other and are separated from each other, and the wire is guided to the primary terminal pin P1 through the steel wire passing groove 332b, or the steel wires 130k of the auxiliary coil part 130 are not in contact with each other and are separated from each other, thereby guiding the wire to the primary terminal pin P1 with the help of the steel wire passing groove 332b.

[0162] Thus, when the steel wires 110 k of the main coil portion 110 or the steel wires 130 k of the auxiliary coil portion 130 are separated from each other and do not contact each other, there is an advantage of stable wire connection.

[0163] Furthermore, preferably, the primary terminal pin P1 is composed of two main coil auxiliary coil terminal pins for connecting the steel wire 100k of the main coil part 110 and two auxiliary coil terminal pins for connecting the steel wire 130k of the auxiliary coil part 130 .

[0164] A front connecting protrusion 321 is protruded downward on one side (front end) of the cover 320, and the front connecting protrusion 321 is connected to any one of the steel wire grooves 332a and 332b. A rear connecting protrusion 325 is protruded rearward on the other side (rear end) of the cover 320, and a rear insertion groove 345 is formed on the rear side of the outer guide 312 of the shell body 310 in the front-to-rear direction to insert and connect the rear connecting protrusion 325.

[0165] Since the existing steel wire is connected to the front connection protrusion 321 through the groove 332a, even if no additional connection groove is formed at the front end of the shell, it has the advantage of saving manufacturing costs.

[0166] Furthermore, all of them are connected at the rear side at the same time, so that the cover 320 and the shell body 310 can be firmly connected. In particular, the rear connecting protrusion 325 is connected to the rear insertion groove 345 in the front-to-rear direction, which has the advantage of firmly grasping the end gap or movement of the primary coil elements and secondary coil elements 100, 200 stacked in sequence in the up-and-down direction.

[0167] A pair of primary terminal blocks 331 adjacent to each other on the left and right sides of the steel wire passing groove 332a connecting the front connecting protrusion 321 are stepped to form a hanging clamp end 331a in relative directions, and the upper hanging clamp end 331a of the pair of primary terminal blocks 331 forming the hanging clamp end 331a is tilted downward to form an inclined guide surface 331b, and a clamping table 321a connected to the hanging clamp end 331a in a hook manner is formed by protruding left and right on the left and right side surfaces of the front connecting protrusion 321, and the front connecting protrusion 321 is guided by the inclined guide surface 331b, and a guide surface 321b is tilted at the front end of the front connecting protrusion 321 in a hook-shaped hanging clamp connection manner, and a pair of cutting grooves 322 are formed between the front connecting protrusion 321 and one side of the cover 320, so that the front connecting protrusion 321 is elastically set, and the front connecting protrusion 321 is elastically connected to the steel wire passing groove 332a in a hook manner.

[0168] When the elastic force and hook connection method is selected, the front connection protrusion 321 can be pressed downwards, and the elastic hook connection can be performed with the help of the inclined guide surface 331b below and a click, thus having the advantages of convenient, fast and stable connection.

[0169] A rear insertion protrusion 326 is formed to protrude downward at the other side (rear end) of the cover 320 , and a rear recessed groove 346 is formed at the rear side of the outer guide 312 of the housing body 310 to insert the rear insertion protrusion 326 .

[0170] Thus, there is an advantage that the rear side of the cover 320 is more firmly connected.

[0171] The front insertion protrusion 323 is separated and protruded by the front connection protrusion 321, and the front insertion protrusion 323 is inserted into the other steel wire passing groove 332b of the steel wire passing grooves 332a and 332b.

[0172] Thus, there is an advantage that the front side of the cover 320 can be connected in a detachable manner by utilizing the wire passing grooves 332a and 332b formed in the past.

[0173] A lead-out groove 351 for leading the triple-quadruple insulated steel wires of the secondary coil element 200 recessed in the up-down direction to the secondary terminal pin P2 is formed at the rear end of the outer guide 312 .

[0174] Furthermore, when the cover 320 is connected to the shell body 310, the center of the protrusion 326 is inserted at the rear and recessed upward in a manner that conforms to the lead-out groove 351, thereby forming a recessed groove 326a for leading the triple and quadruple insulated steel wires of the secondary coil element 200 to the secondary terminal pin P2.

[0175] It also includes: a first lead-out groove 311b, which is recessed downward on the bottom 311 in order to facilitate the lead-out of the triple-quadruple insulated steel wires of the secondary first coil element 210 arranged on the bottom 311 through the lead-out groove 351; a second lead-out groove 320b, which is recessed in a manner of protruding upward on the cover 320 in order to facilitate the lead-out of the triple-quadruple insulated steel wires of the secondary second coil element 220 tightly attached to the cover 320 through the lead-out groove 351.

[0176] Then, the interior of the case Ca (that is, the insertion space S1 ) is hardened and filled with an impregnation liquid (not shown).

[0177] The impregnation liquid impregnates the primary coil element and the secondary coil element 100 and 200 housed in the case Ca, and then hardens to become a liquid that integrates the primary coil element and the secondary coil element 100 and 200 with the case Ca, and is composed of, for example, insulating liquid.

[0178] The impregnation liquid is, for example, epoxy resin liquid, brightener, polyurethane resin liquid, etc.

[0179] The primary coil element, the secondary coil element 100 , 200 , and the case Ca being integrated (one body) means a state where the primary coil element, the secondary coil element 100 , 200 , and the case Ca are integrated (one body) by curing of the impregnation liquid.

[0180] Thus, the primary coil element and the secondary coil element 100, 200 are integrated by the impregnation liquid inside the hardened shell Ca, thereby, the primary coil element and the secondary coil element 100, 200 are more firmly fixed to the shell Ca, especially, the noise generated by the vibration of the coil when the current is applied during operation is prevented, and because the impregnation liquid is composed of insulating liquid, there is an advantage of further improving the insulation characteristics.

[0181] It also includes: a first insulating component (not shown), which is arranged between the secondary first coil element 210 and the primary coil element 100 stacked in sequence as described above, so as to strengthen insulation and improve adhesion; a second insulating component (not shown), which is arranged between the primary coil element 100 and the secondary second coil element 220, so as to strengthen insulation and improve adhesion.

[0182] The first insulating component and the second insulating component are formed of insulating films or insulating tapes.

[0183] The invention further comprises: a third insulating tape (not shown) attached between the bottom 311 of the housing body 310 and the secondary first coil element 210 to strengthen insulation and to catch the movement or vibration of the secondary first coil element 210 .

[0184] The structure as described above has the advantages of enhanced insulation and grasping and moving. The third insulating tape is made of double-sided tape.

[0185] Furthermore, it also includes: a lower magnetic core 410, which protrudes upward to form a lower inner foot 410a inserted into the lower through hole 311a and the inner guide 313, and forms a pair of lower outer feet 410b on the left and right sides of the lower inner foot 410a; an upper magnetic core 420, which is inserted into the upper through hole 320a and the inner guide 313 and protrudes downward to form a pair of upper outer feet 420b on the left and right sides of the upper inner foot; a base 500, which is mounted on a main substrate (not shown) of a finished product for mounting the transformer A, forms a terminal connection hole 511 connected to the primary terminal pin P1, sets a secondary terminal pin P2 connected to the secondary coil element 200, and mounts the shell Ca containing the primary coil element, the secondary coil element 100, 200 and the group of the upper and lower magnetic cores 410 to ensure the insulation distance from the main substrate.

[0186] A lead-out hole 513 is formed at the rear end of the base 500 to be recessed corresponding to the lead-out groove 351 and is used to lead out the steel wire of the secondary coil element 200 .

[0187] The upper and lower magnetic cores 410 are structures for increasing the magnetic coupling force between the primary coil element 100 and the secondary coil element, that is, the stray magnetic field.

[0188] In summary, the preferred embodiments of the present invention have been described. In addition to the above description, the implementation in other specific forms without changing the technical concept or essential features of the present invention belongs to the technical field of the present invention, and it should be self-evident to those skilled in the art of the present invention. Therefore, the above embodiments are not intended to be limiting but to be illustrative.

[0189] The scope of the present invention is shown by the claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts are interpreted as being included in the scope of the present invention.

Claims

1. A planar transformer, characterized in that: include: The housing (Ca) comprises: a housing body (310) forming an installation space (S1); a cover (320) connected to the housing body (310) in a detachable manner to open and close the installation space (S1) of the housing body (310); A flat primary coil element (100) is inserted into the installation space (S1) of the housing body (310); A secondary coil element (200) is inserted into a mounting space (S1) provided in the housing body (310) so as to contact the primary coil element (100) and to generate an induced current by a current applied to the primary coil element (100). The secondary coil element (200) and the primary coil element (100) are simultaneously arranged in an installation space (S1) of a housing body (310) closed by the cover (320), The secondary coil element (200) comprises: A secondary first coil element (210) is inserted and arranged in the installation space (S1) so as to contact one side of the primary coil element (100); The secondary second coil element (220) is inserted and arranged in the installation space (S1) so as to contact the other surface of the primary coil element (100). The secondary first coil element (210), the primary coil element (100) and the secondary second coil element (220) are stacked in sequence and built into a housing (Ca). The primary coil element (100) comprises: The main coil part (110) has a first hollow core (110a) formed in the center, and is wound into a plane by mutually contacting conductive steel wires with insulation coatings; The auxiliary coil part (130) is arranged on the upper side or the lower side of the main coil part (110), and a second hollow core (130a) is formed in the center in a manner of being connected to the first hollow core (110a) of the main coil part (110). The conductive steel wires which are mutually contacted and subjected to insulation coating are wound to form a plane, and an induced voltage is generated with the main coil part (110) through electromagnetic induction to output. The primary coil element (100) comprises: The upper surface of the main coil part (110) is arranged in contact with the first hollow part (110a), and a first central hole (141a) is formed in a manner of communicating with the first hollow part (110a), and is configured to shield the steel wires of the insulating coating that are in contact with each other and are wound to form an upper shielding coil part (141) of the EMI in a flat plate shape; The lower surface of the main coil part (110) is in contact with the first hollow core (110a), and a second central hole (142a) is formed in communication with the first hollow core (110a), constituting a lower shielding coil part (142) of EMI formed in a flat plate shape by winding steel wires that are in contact with each other and have insulating coatings. The lower shielding coil portion (142), the main coil portion (110), the auxiliary coil portion (130) and the upper shielding coil portion (141) of the primary coil element (100) are insulated by an insulating coating material, an adhesive layer is additionally applied on the insulating coating of the auxiliary coil portion (130) and the upper shielding coil portion (141) coated with the insulating coating material, and then heat is applied to melt the applied adhesive layer and then harden it, thereby the auxiliary coil portion (130) and the upper shielding coil portion (141) are insulated. ) are heat-fused to each other, and the lower shielding coil portion (142), the main coil portion (110), the heat-fused auxiliary coil portion (130) and the upper shielding coil portion (141) are stacked in sequence, and heat is applied to the stacked lower shielding coil portion (142), the main coil portion (110), the heat-fused auxiliary coil portion (130) and the upper shielding coil portion (141) to melt the adhesive layer and harden it, thereby forming a coil group that shapes the primary coil element (100).

2. The planar transformer according to claim 1, characterized in that: The primary coil element (100) and the secondary coil element (200) are installed in close contact with each other, and for this purpose, the cover (320) is detachably connected to the shell body (310) in a manner that simultaneously presses the primary coil element (100) and the secondary coil element (200) downward.

3. The planar transformer according to claim 1, characterized in that: The secondary first coil element (210) is formed by a triple insulation coil which is inserted into the installation space (S1) and contacts one side of the primary coil element (100) and is wound in a spiral shape with a triple insulation steel wire. The secondary second coil element (220) is formed by a triple insulation coil which is inserted into the installation space (S1) and is in contact with the other surface of the primary coil element (100) and is wound in a spiral shape with a triple insulation steel wire. The secondary first coil element (210) of the triple insulation coil, the primary coil element (100) and the secondary second coil element (220) of the triple insulation coil are stacked in sequence and built into a casing (Ca).

4. The planar transformer according to claim 1, characterized in that: The housing body (310) further comprises: A flat bottom (311) is connected to the central through hole (100a) of the primary coil element (100) to form a lower through hole (311a) in the center for inserting the lower magnetic core (410); An outer guide (312) protrudes upward from the edge of the bottom (311) to grasp the outer peripheral surfaces (100b, 210b, 220b) of the primary coil element and the secondary coil element (100, 200); an inner guide (313) which contacts the inner circumference (100a', 210a', 220a') of the central through hole (100a, 210a, 220a) of the primary coil element and the secondary coil element (100, 200) to grasp the inner circumference (100a', 210a', 220a') of the central through hole (100a, 210a, 220a) of the primary coil element and the secondary coil element (100, 200), and for this purpose, is formed by protruding upward from the edge of the lower through hole (311a); An upper through hole (320a) is formed on the cover (320) corresponding to the lower through hole (311a) so as to allow the upper magnetic core (420) to be inserted. The installation space (S1) is formed between the inner guide (313) and the outer guide (312), The primary coil element and the secondary coil element (100, 200) are arranged at the bottom (311) of the housing body (310), and are inserted and fixed between the inner guide (313) and the outer guide (312). The secondary first coil element (210) is arranged at the bottom (311), The secondary first coil element (210), the primary coil element (100) and the secondary second coil element (220) are sequentially stacked and built into the casing (Ca).

5. The planar transformer according to claim 4, characterized in that: include: A plurality of primary terminal blocks (331, 331') are formed at one end of the bottom (311) and connected to the primary terminal pins (P1); A plurality of primary terminal pins (P1) are connected to the primary terminal blocks (331, 331') and are wired to the primary coil element (100). A steel wire passing groove (332a, 332b) is formed between the plurality of primary terminal blocks (331, 331') and the primary terminal blocks (331, 331'). The steel wire (110k) of the main coil part (110) and the steel wire (130k) of the auxiliary coil part (130) are connected to the terminal pin (P1) through the steel wire passing grooves (332a, 332b).

6. The planar transformer according to claim 5, characterized in that: Also includes: A first guide protrusion (335a) is formed between the outer peripheral surface of the primary coil element (100) and the primary terminal block (331) and protrudes from the bottom (311) in a manner directly behind the steel wire passing groove (332a), and the steel wire (110k) of the main coil part (110) and the steel wire (130k) of the auxiliary coil part (130) do not contact each other and are separated, thereby guiding the wire to the primary terminal pin (P1) through the steel wire passing groove (332a).

7. The planar transformer according to claim 6, characterized in that: A front connection protrusion (321) is formed on one side of the cover (320) protruding downward, and the front connection protrusion (321) is connected to any one of the steel wire passing grooves (332a, 332b). A rear connection protrusion (325) is formed on the other side of the cover (320) protruding rearward. A rear insertion groove (345) is formed by penetrating the rear side of the outer guide (312) of the shell body (310) in the front-to-rear direction in a manner of inserting and connecting the rear connection protrusion (325).

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