CN208753120U - Micropower modular power source of the chip around line transformer and comprising the transformer - Google Patents

Abstract

A kind of micropower modular power source of the chip around line transformer and comprising the transformer, chip is being provided with the first pin identification point at the first pin around line transformer, whole is in π type structure, it is made of magnet, magnetic sheet and coil, magnet, for H-type structure, the blade to be formed is extended perpendicularly outward including center pillar and from center pillar both ends of the surface, two base angles plating of blade is two pin pads, it is opened up between two pin pads jagged, it is recessed with wire casing in pin pad area, the groove depth of wire casing is not more than groove width, and wire casing is outer to be equipped with conducting wire slope close to center pillar side；Magnetic sheet is I type structure, is in flat square, and bottom surface is equipped with concave plane；The recess for exposing magnet top surface is offered in the exterior rim of end face；The length of magnetic sheet is longer than magnet；Coil is wound on the center pillar of magnet, and magnetic sheet is placed on magnet, is positioned by the concave plane of magnetic sheet to the rigging position of magnet, and carries out being adhesively fixed for magnetic sheet and magnet in the indent dispensing of magnetic sheet.

Description

Sheet type winding transformer and micropower module power supply comprising same

Technical Field

The utility model relates to an apply to piece formula wire winding transformer among micropower power module.

Background

With the rapid development of electronic technology, micro-power modules mainly used in industrial control, instruments, medical treatment, integrated communication signal processing interfaces and the like are also evolving in technology towards small, thin and light directions. The transformer is used as a core power magnetic element in the micro-power supply module, plays the key roles of voltage isolation and energy transfer, and directly influences the miniaturization development of the micro-power module.

A chip type wire winding inductor (as shown in figure 1A) commonly used in the industry at present winds a wire on a center post of an H-shaped patch inductor, the winding up and taking up wires of the wire are respectively welded on side legs of the inductor, and an SMT patch device is formed through processes of bonding a cover plate, coating, encapsulating and the like and is widely applied to various high-frequency circuits as a common-mode filter inductor and a differential-mode filter inductor. (reference document: chip inductor and its application are published in power technology application, article number 0219-. Due to the unique miniaturized structure of the chip inductor, automatic batch production can be rapidly realized, the application field is continuously developed and explored, and technicians in the industry continuously try to limit the chip winding inductor to a common-differential mode filter device applied to a high-frequency circuit, and the chip winding inductor can be applied to a high-frequency micro-power module to be used as a power transformer in the same expectation. The chip inductor is a common differential mode filter inductor, and a common package structure such as 3225 (which is about 3.2 × 2.5 × 0.55mm long × wide × high) mainly bears a small current and a micro signal, and is relatively not harsh to the structure of the magnet itself and the wire diameter, the number of turns, the design conditions, and the manufacturing process of the coil. However, as a power transformer, the following technical bottlenecks and process problems still exist for carrying low-voltage large current, strong signals and high insulation isolation characteristics:

1. the existing wound patch inductor is usually a single winding (as shown in fig. 1B) or a double winding (as shown in fig. 1C),

2. the cover plate is usually made of ferrite of the same material and is bonded with the H-shaped magnetic core, so that on one hand, a closed loop can be formed, and the inductance is increased; on the other hand, an adsorbable plane is formed to facilitate subsequent patch installation. However, when the transformer is encapsulated or plastically packaged, the bonding between the cover plate and the H-shaped magnetic core is affected by the glue, so that the electromagnetic characteristics and the working reliability of the transformer are greatly changed.

3. Because the winding lead wire is welded directly on the bottom surface of the side leg of the H-shaped magnetic core, the bottom surface is a subsequent reflow soldering functional surface of the PCB patch, the quality and the flatness of the lead wire welding can directly influence the coplanarity of the patch mounting, and if the lead wire welding process is unreliable, the potential quality hazard that the lead wire loosens can occur during the subsequent patch reflow soldering.

4. When the lead welding of coil is on the leg face of limit (being the pin pad of bottom surface), the flying lead welding end can make the winding draw this section lead wire of welding end to form a unsettled state because of receiving the lifting of leg face of limit, when follow-up with this type of inductance application in embedment or plastic envelope product, has the cracked risk of lead wire.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a sheet-type wound transformer which can be used in micro-switch power supplies and module power supplies and is simple, small and reliable in manufacture, by improving the structure and process of the conventional sheet-type wound inductor.

In order to achieve the purpose, the utility model provides a sheet-type winding transformer, which is integrally of a pi-shaped structure and comprises a magnet, a magnetic sheet and a coil, wherein the magnet is of an H-shaped structure and comprises a center pillar and blades vertically extending outwards from two end faces of the center pillar, two bottom corners of each blade are electroplated into two pin bonding pads, a notch is arranged between the two pin bonding pads, a wire groove is concavely arranged in each pin bonding pad area, the depth of the wire groove is not more than the width of the wire groove, and a wire slope is arranged outside the wire groove and close to the side of the center pillar; the magnetic sheet is in an I-shaped structure and is in a flat square shape, and the bottom surface of the magnetic sheet is provided with a concave plane for positioning when the magnet is assembled; the outer edge of the end face is provided with a notch which is exposed out of the top surface of the magnet and is used as a glue dispensing position of the magnet and the magnetic sheet; the magnetic sheet is longer than the magnet; the coil is wound on the center post of the magnet, the magnetic sheet covers the magnet, the concave plane of the magnetic sheet is used for positioning the assembling position of the magnet, and the adhesive fixation between the magnetic sheet and the magnet is carried out by dispensing at the notch of the magnetic sheet.

Preferably, in the magnet, the blades at two ends of the column are respectively a first blade and a second blade, and a pin pad of the first blade is an outgoing terminal of the first winding; a pin bonding pad of the second blade is an outgoing terminal of the second winding; the space empty area between the two blades is an insulation isolation area between the primary side and the secondary side of the transformer.

Preferably, in the magnet, the blades at two ends of the column are respectively a first blade and a second blade, two pin pads on the same side of the first blade and the second blade are lead-out terminals of the first winding, two pin pads on the other side of the first blade and the second blade are lead-out terminals of the second winding, and a gap of each blade is an insulation isolation area between a primary side and a secondary side of the transformer; the aspect ratio of the magnet is 1 to 1.2.

Preferably, the lead slope of the magnet is an inclined slope connecting the wire groove and the center pillar.

Preferably, the top surfaces of the blades of the magnet are ground to be mirror planes.

Preferably, an insulating layer is added on the outer wall of the center pillar of the magnet.

Preferably, the notch is a semicircular through hole, and the caliber of the notch is smaller than the thickness of the blade.

Preferably, the sheet-type wound transformer is additionally provided with a glue dispensing position at the joint of the magnetic sheet and the outer wall of the blade of the magnet.

Preferably, the sheet type winding transformer is provided with a first pin identification point near the first pin.

The utility model also provides a micropower module power contains foretell piece formula wire-wound transformer and PCB circuit board, and piece formula wire-wound transformer pastes and adorns on PCB circuit board.

The utility model provides a micropower module power contains foretell piece formula wire-wound transformer and PCB circuit board, sets up the recess on the PCB circuit board, and piece formula wire-wound transformer's magnet sinks in the recess to be longer than the both wings frame that the magnet outwards stretched out on the PCB circuit board through the magnetic sheet.

The utility model provides a piece formula wire winding transformer comprises one "H" type magnet, one "I" type magnetic sheet and coil, its characterized in that: the H-shaped magnet is a center pillar, the center pillar is derived from two ends of the center pillar, two side pieces which are longitudinal to the center pillar shaft are arranged along the circumference of the center pillar, the length-width ratio of the whole magnet surrounded by the two side pieces is 1: 1-1.2, the length of the I-shaped magnet piece is larger than that of the H-shaped magnet piece and covers and contacts the top of the side pieces, and a half hole is formed in the I-shaped magnet piece; two or more coils are wound on the center post of the H-shaped magnet, and the coil leads are respectively connected in the wire grooves of at least two or more ends at the bottom of the H-shaped magnet through the wire guide grooves.

The center column of the H-shaped magnet is a uniform body such as square, round, oval and the like; the center post extends towards two ends and is respectively provided with a side piece perpendicular to the axis direction of the center post, and one end part of each side piece is provided with a metal plating layer; the end part of the side piece is parallel to the central column and is provided with a gap, and the gap distance is more than 1.0 mm; the side plate is provided with a wire groove, and an oblique wire groove is formed from the wire groove to the middle column.

Preferably, a slot is formed in the bottom of the side piece of the H-shaped magnet and is located on the bottom surface of the side piece, the slot is in the shape of a clamping slot with a semicircular hole, a metal coating is arranged on the cambered surface of the slot and the coplanar surface of the end part of the side piece, and the metal coating on the end part of the side piece can be electrically connected with the PCBA when being used as a surface-mounted component (PCBA) functional surface in reflow soldering. The lateral plate is close to the side of the center pillar and is provided with a wire groove, the wire groove is in an inclined state and is obliquely connected to the center pillar through one end of the wire groove, the inclined angle is matched with the winding angle of the lead and the vertical height of the lateral plate and the center pillar, and the lateral plate can support and guide the lead to avoid suspension. Meanwhile, the wire guide groove can effectively prevent redundant tin from flowing out of the wire clamping groove when the tin is added to the wire end in the wire clamping groove for welding, so that the wire clamping groove is isolated from a winding coil wound on the center column. The top of the side piece is a ground plane, and the ground plane can be processed by mirror grinding in special occasions, so that the contact gap between the side piece and the I-shaped magnetic sheet after assembly is reduced.

Furthermore, the H-shaped magnet is formed by processing soft magnetic ferrite with high magnetic conductivity and high resistivity, the high magnetic conductivity can ensure that the transformer obtains larger inductance, and the high resistivity ensures the insulation performance of the magnet. When the material of the magnet is selected from ferrite such as nickel zinc, manganese zinc and the like, in the specific occasion that the safety requirement needs to be met, the insulation between the magnet and the coil can be reinforced by adding methods including but not limited to additional coating, medium and the like to the central column winding part.

The I-type magnetic sheet is made of soft magnetic ferrite with low magnetic conductivity and high resistivity, and the size of the magnetic sheet is wider than that of the H-type magnet but longer than that of the H-type magnet. The I-shaped magnetic sheet is provided with a groove, and the length of the groove is close to that of the side piece of the H-shaped magnet. The I-shaped magnetic sheet is provided with two or more openings. Preferably, when the I-shaped magnetic sheet and the H-shaped magnetic body are assembled, the groove plays a limiting role and can prevent adhesion from being inclined.

The two coils are formed by winding two independent electromagnetic wires which are insulated from each other. The coil winding and unwinding wires are placed in the wire grooves of the side plates, and winding and unwinding lead wires pass through the wire grooves and are wound on the central column. Preferably, the two coils are primary and secondary coils of the sheet type transformer, and are wound in parallel or in rows, and the number of the coils is not fixed.

The utility model also provides a manufacturing method of the sheet-type winding transformer, which comprises the following steps of magnet forming, wherein the magnet and the magnetic sheet of the ferrite magnetic material are formed by firing, the magnet is of an H-shaped structure and comprises a center post and blades vertically extending outwards from two end faces of the center post, two base angles of the blades are electroplated into two pin bonding pads, a notch is arranged between the two pin bonding pads, a wire groove is concavely arranged in the pin bonding pad area, the groove depth of the wire groove is not more than the groove width, and a wire slope is arranged outside the wire groove and close to the side of the center post; the magnetic sheet is of an I-shaped structure and is in a flat square shape, and the bottom surface of the magnetic sheet is provided with a concave plane for positioning when the magnet is assembled; the outer edge of the end face is provided with a notch which is exposed out of the top surface of the magnet and is used as a glue dispensing position of the magnet and the magnetic sheet; the magnetic sheet is longer than the magnet; winding, namely winding a plurality of coils of the transformer on the central column, clamping lead ends of the coils into the wire grooves through the wire slopes respectively, and welding the lead ends into the wire grooves; and assembling and molding, namely covering the magnetic sheet on the top of the magnet, positioning the assembling position of the magnet by the concave plane of the magnetic sheet, and dispensing glue at the notch of the magnetic sheet to bond and fix the magnetic sheet and the magnet.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the innovative design of "H" type magnet, the coil lead wire is attached at the wire casing again in the wire duct, can effectively avoid the unsettled problem of lead wire among the prior art on the one hand, coplane degree when on the other hand can guarantee the paster.

2. The innovative design of the I-shaped magnetic sheet can ensure the limit and fixation during the assembly, avoid the deflection of the device during the assembly and simultaneously be beneficial to ensuring the bonding strength of the magnetic sheet and the magnet.

3. The chip transformer solves the technical problem that the conventional chip winding inductor cannot be used as a power transformer, and can be widely applied to a module power supply.

Drawings

FIG. 1A is a schematic diagram of a conventional chip-type wire-wound inductor;

fig. 1B is a schematic diagram of a chip winding inductor with a single winding in the prior art;

fig. 1C is a schematic diagram of a conventional double-winding chip winding inductor;

fig. 2A is a perspective view of the sheet-type wound transformer of the present invention;

fig. 2B is a perspective view of the bottom view of the sheet-type wound transformer of the present invention;

FIG. 2C is a schematic circuit diagram of a transformer;

fig. 2D is a first pin wiring diagram of the chip-type wound transformer according to the present invention;

fig. 2E is a second pin wiring diagram of the chip-type wound transformer according to the present invention;

fig. 3 is a perspective view of the "H" shaped magnet of the sheet-type wound transformer of the present invention;

FIG. 4 is a perspective view of the I-shaped magnetic sheet of the sheet-type wound transformer of the present invention;

fig. 5 is a perspective view of the sheet-type wound transformer after winding the H-shaped magnet;

fig. 6 is a flow chart of a method for manufacturing a sheet-type wound transformer according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1- "H" type magnet; 2-I "type magnetic sheet; 3-coil

100-a center pillar; 110. 120-blade; 111. 121-a notch; 1131. 1132, 1231, 1232-wire chase; 1141. 1142, 1241, 1242 — wire trench; 1121. 1122, 1221, 1222-end; 201. 202-half hole; 210-a groove; 203-MARK point; 3, a coil; 311. 312, 321, 322-leads;

Detailed Description

To the professional technical personnel of this trade, the utility model relates to an subassembly, there is the difference in the processing period structure of difference, in the manufacturing process, relies on different mechanical equipment and worker's anchor clamps and technology implementation method, can reference and derive various changes on structure and processing aspect, and it is all not divorced from the scope of the utility model. And in which the description and drawings are given for the purpose of general description and not limitation of the invention in general terms, for the purpose of facilitating a concise understanding.

As shown in fig. 2A and 2B, the utility model provides a pair of sheet-type wire-wound transformer's perspective view, a sheet-type wire-wound transformer wholly is pi type structure, comprises magnet 1, magnetic sheet 2 and coil 3.

The magnet 1 is of an H-shaped structure and comprises a center pillar 100 and blades 110 and 120 which are vertically and outwardly extended from two end faces of the center pillar, wherein the two blades are of a symmetrical structure, two bottom corners of the blade 110 are electroplated into two pin pads 1121 and 1122, and a gap 111 is formed between the two pin pads 1121 and 1122; two bottom corners of the blade 120 are plated with two lead pads 1221, 1222, and a gap 121 is formed between the two lead pads 1221, 1222. Theoretically, according to the schematic circuit diagram of the transformer shown in fig. 2C, the primary and secondary coils of the transformer can form two winding ways on the pin pads of the magnet 1, one of which is shown in fig. 2D, and two pin pads 1121, 1221 on the same side of the blade 110 and the blade 120 are used as the leading-out terminals of the first winding of the transformer; the two pin pads 1122, 1222 on the other side of the blade 110 and the blade 120 serve as lead-out terminals of the second winding; the notches 111, 121 of each blade are insulating isolation regions between the first and second windings (i.e., primary and secondary) of the transformer. In the winding mode, in order to meet the requirement of the primary interstage pin isolation distance and simultaneously consider the miniaturization of the transformer volume, the length-width ratio range of the whole magnet surrounded by the two blades needs to be 1: 1-1: 1.2. Secondly, as shown in fig. 2E, the pin pads 1121, 1122 of the blade 110 are the lead-out terminals of the first winding; pin pads 1221 and 1222 of the blade 120 are lead-out terminals of the second winding; the space empty area between the two blades is an insulation isolation area between the primary side and the secondary side of the transformer. The winding mode naturally meets the requirement of the primary interstage pin isolation distance due to the space area, so that the whole size of the magnet surrounded by the two blades does not need to consider the limit problem of the isolation distance, and the limited design condition of the length-width ratio is avoided.

The following description will discuss the principle and embodiments of the present invention in detail with reference to the accompanying drawings by taking the first winding method as an example.

The utility model provides a pair of piece formula wire-wound transformer (hereinafter can be abbreviated as piece formula transformer) is shown in fig. 2A, comprises "H" type magnet 1, "I" type magnetic sheet 2 and coil 3.

As shown in fig. 3, the "H" type magnet 1 of the winding transformer of the present invention is preferably made of high resistivity nickel zinc ferrite, and has a structure of a center pillar 100, the center pillar 100 is derived from two ends, and two blades 110 and 120 (which constitute the side wall of the transformer and may be referred to as side pieces) are provided around the center pillar 100 in the longitudinal direction of the center pillar axis. In order to optimize the volume and the isolation effect of the transformer, the length-width ratio between the side plates 110 and 120 is 1: 1-1.2, or the length-width ratio of the whole magnet surrounded by the two side plates is 1: 1-1: 1.2; the center pillar 100 is a uniform body such as a square, a circle, an ellipse, etc.; four end parts (1121, 1122, 1221, 1222) of the side pieces 110, 120 are respectively metallized, namely two bottom corners of the two side pieces are electroplated into two pin pads; notches 111 and 121 are formed at the end parts of the side pieces 110 and 120 in parallel with the center posts to form an electrical isolation space between coil pins of the primary and secondary sides of the transformer; the distance between the notches 111 and 121 is larger than 1.0mm so as to meet the strict requirement on the electrical isolation distance of the transformer; the side sheet 110 is provided with wire grooves 1131, 1132, the side sheet 120 is provided with wire grooves 1231, 1232, the wire groove 1131 has an oblique wire groove 1141 to the center pillar, the wire groove 1132 has an oblique wire groove 1142 to the center pillar, the wire groove 1231 has an oblique wire groove 1241 to the center pillar, and the wire groove 1232 has an oblique wire groove 1242 to the center pillar. Each wire casing recess is located in the pin pad district of the lateral plate bottom of "H" type magnet, the wire casing is located the bottom surface of lateral plate, the wire casing is the screens groove, the shape of wire casing is the semicircle orifice, the groove width of wire casing is equivalent with wire-wound line diameter, the groove depth of wire casing is less than the wire-wound line diameter of coil, the groove depth of wire casing is not more than the groove width promptly, in order to supply to hold the line end of coil, and make the line end block in it, and not too much activity space, thereby it is difficult for because of tin melting off the off position to guarantee the transformer when carrying out paster reflow soldering on PCB better. The slot cambered surface and the side piece end part are both provided with metal coatings, and the metal coatings at the side piece end part can be used as a patch functional surface to be connected electrically with a PCB blank board and other SMT components through a reflow soldering process after being assembled together. The side piece 110 is provided with wire grooves 1141 and 1142 near the side of the center pillar, the side piece 120 is provided with wire grooves 1241 and 1242 near the side of the center pillar, the wire grooves are obliquely connected to the center pillar from one end of the wire groove, the inclination angle is matched with the winding angle of the lead and the vertical height of the side piece and the center pillar, and the wire grooves can support and guide the lead to avoid suspension; the wire groove also forms a solder strip between the solder of the wire groove and the coil pack of the center post. Because the structure of the wire trench is an inclined slope surface, the wire trench can also be vividly called a wire slope. The top of the side piece is a ground plane, and the ground plane can be processed by mirror grinding in special occasions, so that the contact gap between the side piece and the I-shaped magnetic sheet after assembly is reduced.

Furthermore, the H-shaped magnet is formed by processing soft magnetic ferrite with high magnetic conductivity and high resistivity, the high magnetic conductivity can ensure that the transformer obtains larger inductance, and the high resistivity ensures the insulation performance of the magnet. When the material of the magnet is selected from ferrite such as nickel zinc, manganese zinc and the like, in the specific occasion that the safety requirement needs to be met, the insulation between the magnet and the coil can be reinforced by adding methods including but not limited to additional coating, medium and the like to the central column winding part.

As shown in fig. 4, the "I" type magnetic sheet 2 of the chip-type wire-wound transformer of the present invention is formed by processing a soft magnetic ferrite having low magnetic permeability and high electrical resistivity, the size of the magnetic sheet is wider than the "H" type magnetic body but longer than the "H" type magnetic body, and the portion of the "I" type magnetic sheet 2 that is longer than the "H" type magnetic body and extends outward is the two wings 205. The I-shaped magnetic sheet 2 is provided with a groove 210, and the length of the groove 210 is close to that of the side piece of the H-shaped magnetic body, so that the groove 210 forms a concave plane on the bottom surface of the magnetic sheet 2. Preferably, when the I-shaped magnetic sheet and the H-shaped magnetic sheet are assembled, the groove is used as an assembly positioning reference of the magnetic sheet and the magnetic sheet, the assembly position of the magnetic sheet and the magnetic sheet is positioned, the positioning and limiting effects are achieved, and the adhesion deflection can be prevented. The outer edge of the end face of the I-shaped magnetic sheet 2 is provided with half holes 201 and 202 which are exposed out of the top surface of the magnet, the structure of the half holes is similar to that of a single stamp hole, so that glue dispensing positions of the magnet and the magnetic sheet are formed, the magnet is assembled into the magnetic sheet and then the magnet and the magnetic sheet are bonded and fixed, and therefore the influence of non-magnetic materials on the electromagnetic property of a magnetic closed loop is reduced as much as possible by reducing the adhesive bonding area between the magnet and the magnetic sheet, and the working reliability of the transformer is guaranteed. The half holes 201 and 202 are small notches on the outer edge of the end face of the magnetic sheet 2, the hole diameter is smaller than the thickness of the blade, and the half holes can be semicircular through holes or other shapes with cross section shapes formed by the outer edge of the end face and a non-packaging curve, such as circular arc-shaped through holes. And the half-holes can be provided with two or more open holes. The top surface of the I-shaped magnetic sheet 2 is provided with a first pin identification point near the first pin for identifying the first pin of the transformer.

As shown in fig. 5, the sheet-type winding transformer of the present invention is a perspective view of the wound H-shaped magnet, and the coil 3 is formed by winding two independent and insulated electromagnetic wires. The coil winding and unwinding wire is placed in the wire groove of the side piece, and the winding and unwinding lead passes through the wire guide groove and is wound on the center pillar in various winding modes. Preferably, the two coils are primary and secondary coils of the sheet type transformer, and are wound in parallel or in rows, and the number of the coils is not fixed.

As shown in fig. 2A, 2B the utility model discloses piece formula wire-wound transformer's stereogram, fig. 4 is shown to be the utility model discloses piece formula wire-wound transformer's "I" type magnetic sheet's stereogram the utility model discloses piece formula wire-wound transformer pastes when making micropower module power on the PCB circuit board, can open the recess on the PCB circuit board, and magnet 1 of transformer sinks in the recess to through the magnetic sheet 2 be on a long side in the outside both wings 205 of stretching out of magnet 1 and put up on the PCB circuit board, thereby can further reduce the whole height dimension of little functional module power product.

As shown in fig. 6, it is a flow chart of the manufacturing method of the sheet-type winding transformer of the present invention, and the process flow thereof includes the following steps:

1. magnet molding: as the main material of the chip transformer, the H-shaped magnet and the I-shaped magnetic sheet are molded and fired by a professional magnetic material manufacturer according to the design requirements and the processing technology of the ferrite magnetic material. This utility model discloses do not do too much to describe to the processing technology and the process of magnetism material, nevertheless can select according to the research and development demand in specific product application field to the appearance structure and the magnetism material of magnet.

2. And (3) reprocessing of the H-shaped magnet: for a power transformer, certain insulation and isolation requirements are required between primary stages on default occasions, an "H" -shaped magnet not only carries a coil, but also electric connection between the coil and a PCBA (namely a semi-finished product obtained by assembling components such as a PCB blank board, an SMT (surface mount technology) and the like together to complete the whole manufacturing process) is realized by transiting a conductive coating on a side piece, so that insulation and isolation between the magnet and the coil are realized by performing insulation treatment on a body at the part of the center column and the side piece of the "H" -shaped magnet through coating, wrapping, pasting and the like of some insulation media in actual application.

3. Winding and fixing: a plurality of coils are wound on the central column by winding equipment by adopting a single winding, parallel winding or other winding modes for electromagnetic wires (including but not limited to enameled wires, insulated wires and other metal wires). The lead wires of the coil are tied in the wire grooves through the wire grooves respectively, and the end heads of the lead wires, the wire grooves and the metal coating are welded into a whole in the modes of melting welding, pressure welding, brazing and the like. Because the lead wire card is in the wire casing, the metal coating coplane of a plurality of lateral plates after the welding can satisfy more accurate coplane degree when follow-up reflow soldering paster.

4. Bonding of I-type magnetic sheets: the I-shaped magnetic sheet and the H-shaped magnet are assembled in a matched mode, two side pieces of the H-shaped magnet are embedded into a groove of the I-shaped magnetic sheet, two openings in the I-shaped magnetic sheet are aligned with the two side pieces of the H-shaped magnet respectively, glue is used for bonding at the joint of the openings and the side pieces, glue can be further added at the joint 401 and 402 of the outer walls of the I-shaped magnetic sheet and the two side pieces, and therefore the bonding strength of the I-shaped magnetic sheet and the H-shaped magnet in special application environments such as encapsulation and plastic package is improved. And (4) baking at high temperature after bonding, and curing the colloid to form the chip transformer.

5. And (3) characteristic detection: and testing and evaluating the characteristics of the manufactured chip inductor, such as inductance, leakage inductance, quality factor, insulation voltage resistance value and the like.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims (10)

1. The utility model provides a chip wire winding transformer, its is being provided with first pin identification point, its characterized in that near first pin department: the whole body is in a pi-shaped structure and consists of a magnet, a magnetic sheet and a coil,

the magnet is of an H-shaped structure and comprises a center pillar and blades vertically extending outwards from two end faces of the center pillar, two bottom corners of each blade are electroplated into two pin bonding pads, a gap is formed between the two pin bonding pads, a wire groove is concavely arranged in each pin bonding pad area, the groove depth of each wire groove is not more than the groove width, and a wire slope is arranged outside each wire groove and close to the side of the center pillar;

the magnetic sheet is of an I-shaped structure and is flat and square, and a concave plane is arranged on the bottom surface of the magnetic sheet; the outer edge of the end face is provided with a notch exposed out of the top surface of the magnet; the magnetic sheet is longer than the magnet; wherein,

the coil is wound on the center post of the magnet, the magnetic sheet covers the magnet, the concave plane of the magnetic sheet is used for positioning the assembly position of the magnet, and glue is dispensed at the notch of the magnetic sheet to bond and fix the magnetic sheet and the magnet.

2. The sheet-type wound transformer of claim 1, wherein: blades at two ends of the column of the magnet are respectively a first blade and a second blade, and a pin bonding pad of the first blade is an outgoing terminal of the first winding; a pin bonding pad of the second blade is an outgoing terminal of the second winding; the space empty area between the two blades is an insulation isolation area between the primary side and the secondary side of the transformer.

3. The sheet-type wound transformer of claim 1, wherein: the magnetic body is characterized in that blades at two ends of the column are respectively a first blade and a second blade, two pin bonding pads on the same side of the first blade and the second blade are leading-out terminals of a first winding, two pin bonding pads on the other side of the first blade and the second blade are leading-out terminals of a second winding, and a gap of each blade is an insulating isolation area between a primary side and a secondary side of the transformer; the aspect ratio of the magnet is 1 to 1.2.

4. The sheet-type wound transformer of claim 1, wherein: the top surfaces of the blades of the magnets are ground into mirror planes.

5. The sheet-type wound transformer of claim 1, wherein: and an insulating layer is additionally arranged on the outer wall of the center post of the magnet.

6. The sheet-type wound transformer of claim 1, wherein: the notch is a semicircular through hole, and the caliber of the notch is smaller than the thickness of the blade.

7. The sheet-type wound transformer of claim 1, wherein: and a glue dispensing position is additionally arranged at the joint of the magnetic sheet and the outer wall of the blade of the magnet.

8. The sheet-type wound transformer of claim 1, wherein: the lead slope of the magnet is an inclined slope surface connecting the wire slot and the center pillar.

9. A micro-power modular power supply comprising the chip-type wound transformer of any one of claims 1 to 8 and a PCB circuit board, wherein: the sheet type winding transformer is attached to the PCB.

10. A micro-power modular power supply comprising the chip-type wound transformer of any one of claims 1 to 8 and a PCB circuit board, wherein: the PCB is provided with a groove, the magnet of the sheet type winding transformer sinks in the groove, and the two wings which are longer than the magnet and extend outwards are arranged on the PCB through magnetic sheets.