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

Micropower modular power source of the chip around line transformer and comprising the transformer

Technical field

The utility model relates to a kind of chips applied in micropower power supply module around line transformer.

Background technique

With developing by leaps and bounds for electronic technology, it is mainly used for industry control, instrument, medical treatment, integrated communication signal processing interface etc. The micropower power supply module of aspect also constantly carries out evolution of technology towards small, thin, light direction.Transformer is as micropower power supply Core power magnetic cell in module, carries voltage isolation, the key effect of energy transmission, and size directly influences micro- function The miniaturization of rate module.

Common a kind of chip wire wound inductor (such as Figure 1A) in industry at present, conducting wire is wrapped in H-type chip inductor The take-up that rises of column, conducting wire is respectively welded on the leg of inductance side, using techniques such as bonding cover plate, coating, encapsulatings, forms SMT patch Piece device is widely used in various high-frequency circuits as total, differential mode filter inductance.It (reference paper: " chip inductor and its answers With ", it is published in " power technology utilization ", article number 0219-2719 (2009) 08-0037-05).Chip inductor is only due to it Special miniaturization structure can fast implement automatic batch production, also constantly be developed and explored with field, in industry Technical staff continuously attempts to be intended to be not limited to chip wire wound inductor to be used in the total differential mode filter part in high-frequency circuit, equally Be desirable to apply in high frequency micropower power supply module and use as power transformer.Chip inductor is as differential mode filtered electrical altogether Sense, common encapsulating structure such as 3225 (its long * wide * high is about 3.2*2.5*0.55mm), what is mainly undertaken is low current, wechat Number, the line footpath of structure and coil to magnet itself, circle number, design condition and manufacturing process be not comparatively harsh.But As power transformer, to carry low-voltage, high-current, strong signal and it is higher be dielectrically separated from characteristic, now there are still as follows Technical bottleneck and process difficulties:

1, existing coiling chip inductor, usually simplex winding (such as Figure 1B) either double winding (such as Fig. 1 C),

2, cover plate is usually that the ferrite of same material is constituted, Nian Jie with H magnetic core, is on the one hand capable of forming closed circuit, increases Coilloading sensibility reciprocal；On the other hand forming an adsorbable plane facilitates subsequent patch to install.But when encapsulating or plastic packaging In the case of, cover plate it is bonding with H magnetic core by colloid influenced to cause its electromagnetic property and transformer functional reliability occur compared with Big variation.

3, since winding leads are directly welded at the side leg bottom surface of H magnetic core, which is the subsequent reflux in PCB patch again Welding function face is welded, the quality and flatness of lead welding will have a direct impact on the coplane degree of patch installation, and if lead welds When technique is unreliable, the hidden danger of quality that lead loosens can occur in subsequent patch Reflow Soldering.

4, when the lead of coil is welded on side leg face (i.e. the pin pad of bottom surface), fly line welding ends is because by side leg face This section of lead that raising can make winding be pulled to welding ends forms a vacant state, subsequent that such inductance is used in encapsulating or modeling When sealing in product, there are the risks of wire breaking.

Utility model content

In view of problem above, it is an object of the invention to by changing to existing chip wire wound inductor progress structure and technique Into, provide it is a kind of can apply in microswitch power supply and modular power source to be simple to manufacture, small and exquisite reliable chip is around line transformer.

For achieving the above object, the utility model provides a kind of chip around line transformer, and whole is in π type structure, by Magnet, magnetic sheet and coil composition, magnet are H-type structure, extend perpendicularly outward the leaf to be formed including center pillar and from center pillar both ends of the surface Piece, blade two base angles plating be two pin pads, opened up between two pin pads it is jagged, in pin pad area It is recessed with wire casing, 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, bottom surface are equipped with concave plane, to be positioned magnet group is fashionable；Exposing magnet is offered in the exterior rim of end face The recess of top surface, to the dispensing position as magnet and magnetic sheet；The length of magnetic sheet is longer than magnet；Wherein, coil is wound on magnet On center pillar, magnetic sheet is placed on magnet, is positioned by the concave plane of magnetic sheet to the rigging position of magnet, and in the indent of magnetic sheet Dispensing carries out being adhesively fixed for magnetic sheet and magnet.

Preferably, the magnet, the blade at center pillar both ends are respectively the first blade and the second blade, and the first blade draws Foot pad is the leading-out terminal of the first winding；The pin pad of second blade is the leading-out terminal of the second winding；Two blades Between interval dead zone be primary and secondary, transformer and be dielectrically separated from area.

Preferably, the magnet, the blade at center pillar both ends are respectively the first blade and the second blade, the first blade and The ipsilateral two pins pad of two blades is the leading-out terminal of the first winding, the two pins weldering of the first blade and the second blade other side Disk is the leading-out terminal of the second winding, and the notch of each blade is primary and secondary, transformer and is dielectrically separated from area；The length of the magnet Wide ratio is 1 to 1 to 1 to 1.2.

Preferably, the conducting wire slope of the magnet is the face of slope for connecting wire casing and center pillar.

Preferably, the blade top surface of the magnet is ground to mirror plane.

Preferably, the middle column outer wall of the magnet has additional insulating layer.

Preferably, the recess is half-round cross hole, and the bore of recess is less than the thickness of blade.

Preferably, the chip adds dispensing position in the junction of magnetic sheet and the blade outer wall of magnet around line transformer.

Preferably, the chip is being provided with the first pin identification point at the first pin around line transformer.

The utility model also provides a kind of micropower modular power source, comprising above-mentioned chip around line transformer and PCB circuit Plate, chip are mounted in PCB circuit board around line transformer.

The utility model also provides a kind of micropower modular power source, comprising above-mentioned chip around line transformer and PCB circuit Plate opens up groove in PCB circuit board, and chip is sunken in groove around the magnet of line transformer, and by magnetic sheet be longer than magnet institute to The both wings frame of outer stretching is in PCB circuit board.

Chip provided by the utility model is made of around line transformer " H " type magnet, " I " type magnetic sheet and coil, It is characterized by: " H " type magnet is a center pillar, center pillar is derivative to both ends, and along tool of the middle band of column week, there are two longitudinal with middle axis of a cylinder Two lateral plates, the length-width ratio of the magnet entirety that two lateral plates are surrounded are 1:1~1.2, " I " type magnetic sheet length be greater than " H " type magnet and Covering is contacted with the top of lateral plate, is provided with half bore on " I " type magnetic sheet；The coil of two or more quantity is wrapped in " H " type magnetic The wire casing of at least two end on body center pillar and bottom that coil lead is connected to " H " type magnet via conducting wire ditch respectively In.

" H " type magnet center pillar is the uniform shape bodies such as square, circle, ellipse；Center pillar extends to both ends and perpendicular to center pillar Axis direction respectively has lateral plate, and the one end of lateral plate has electrodeposition of metals；The end of lateral plate is parallel to center pillar equipped with notch, between notch Away from greater than 1.0mm；Lateral plate is equipped with wire casing, and wire casing to center pillar has slanting conducting wire ditch.

Preferably, the lateral plate bottom of " H " type magnet is provided with wire casing, and wire casing is located at the bottom surface of lateral plate, and wire casing shape is half The coplanar of the detent slot of circular hole, wire casing cambered surface and lateral plate end has metal coating, and the metal coating of lateral plate end is again as patch Piece functional surfaces can be realized with PCBA in Reflow Soldering and are electrically connected.Lateral plate is equipped with conducting wire ditch close to center pillar side, and conducting wire ditch is inclined State by wire casing one end it is oblique be connected to center pillar, tilt angle be matched with lead coiling angle and lateral plate it is vertical with center pillar Highly, function is energy support guidance lead, is avoided hanging.Meanwhile conducting wire ditch can effectively prevent line end in cable clamping interface from adding tin Extra tin is flowed out from cable clamping interface when welding, thus realize cable clamping interface on center pillar around winding wire packet be isolated.Lateral plate Top is the plane of grinding, and the plane ground under special occasions can be " mirror surface " attrition process, is conducive to reduce and " I " type magnetic sheet Contact gap after assembling.

Further, " H " type magnet is process by the soft magnetic ferrite with high magnetic permeability, high resistivity, high magnetic conductance Rate can guarantee that transformer obtains biggish inductance, and high resistivity guarantees the insulation performance of magnet itself.When the material of magnet It, can for center pillar winding portion in the occasion that need to specifically meet safety requirement when selecting the ferrites such as nickel zinc, MnZn, MnZn The insulating strength between magnet and coil is carried out in such a way that increase includes but is not limited to additional coating, medium etc..

" I " type magnetic sheet is process by the soft magnetic ferrite with low magnetic permeability, high resistivity, and magnetic sheet size etc. is wider than " H " type magnet but it is longer than " H " type magnet." I " type magnetic sheet is equipped with groove, and the side panel length of length " H " type magnet of groove is close. " I " type magnetic sheet is simultaneously equipped with two or more apertures.Preferably, set when " I " type magnetic sheet and " H " type magnet are assembled Groove plays position-limiting action, can prevent bonding skew.

Two coils are formed by two electromagnetic wire coilings that are independent and insulating each other.Coil plays take-up and is placed in lateral plate Wire casing plays take-up lead and is wrapped on center pillar by conducting wire ditch is various.Preferably, two coils are the primary and secondary of chip transformer Coil in multiple distribution system or divides column coiling state, and wire circle is indefinite.

The utility model provides a kind of chip around the manufacturing method of line transformer again, includes the following steps, magnet molding step Suddenly, the magnet of ferrite magnetic material and magnetic sheet are by forming by a firing, wherein magnet is H-type structure, including center pillar and from center pillar both ends Face extends perpendicularly outward the blade to be formed, and two base angles plating of blade is two pin pads, between two pin pads It opens up jagged, is recessed with wire casing in pin pad area, the groove depth of wire casing is not more than groove width, and outer be equipped with close to center pillar side of wire casing is led Line slope；Magnetic sheet is I type structure, is in flat square, and bottom surface is equipped with concave plane, is positioned so that magnet group is fashionable；Outside end face The recess for exposing magnet top surface is offered on rim, to the dispensing position as magnet and magnetic sheet；The length of magnetic sheet is longer than magnet； Spooling step, multiple coils of coiling transformer on center pillar, each lead end of coil are caught in wire casing via conducting wire slope respectively, Lead end is welded in wire casing again；Assembled formation step, magnetic sheet are placed on the top of magnet, by the concave plane of magnetic sheet to magnet Rigging position positioned, and carry out being adhesively fixed for magnetic sheet and magnet in the indent dispensing of magnetic sheet.

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

1, the innovative design of " H " type magnet, coil lead are attached to conducting wire ditch and are fixed on wire casing again, on the one hand can be effective The hanging problem of lead in the prior art is avoided, on the other hand can guarantee coplane degree when patch.

2, the innovative design of " I " type magnetic sheet can guarantee limit and fixation when assembled, avoid device skew when assembled While, it is also beneficial to guarantee the adhesive strength of magnetic sheet and magnet.

3, chip transformer solve existing chip wire wound inductor can not be as the technical problem of power transformer, Neng Gouguang It is general to be used in modular power source.

Detailed description of the invention

Figure 1A is existing chip wire wound inductor schematic diagram；

Figure 1B is the schematic diagram of the chip wire wound inductor of existing simplex winding；

Fig. 1 C is the schematic diagram of existing doublewound chip wire wound inductor；

Fig. 2A is perspective view of the utility model chip around line transformer；

Fig. 2 B is perspective view of the utility model chip around the bottom views of line transformer；

Fig. 2 C is the circuit diagram of transformer；

Fig. 2 D is the first the pin wiring diagram of the utility model chip around line transformer；

Fig. 2 E is second pin wiring diagram of the utility model chip around line transformer；

Fig. 3 is perspective view of the utility model chip around " H " type magnet of line transformer；

Fig. 4 is perspective view of the utility model chip around " I " type magnetic sheet of line transformer；

Fig. 5 is perspective view of the utility model chip after " H " type magnet spiral of line transformer；

Fig. 6 is flow chart of the utility model chip around the manufacturing method of line transformer.

In attached drawing, parts list represented by the reference numerals are as follows:

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

100-center pillars；110,120-blade；111,121-notch；1131,1132,1231,1232-wire casing；1141, 1142,1241,1242-conducting wire ditch；1121,1122,1221,1222-end；201,202-half bore；210-grooves； 203-MARK points；3-coils；311,312,321,322-lead；

Specific embodiment

For the professional technician of the industry, component involved by the utility model, in the different processing phases Between structure have differences, manufacture process in, by different mechanical equipment and clamping apparatus and process implementing method, Neng Gou It is used for reference in structure and processing aspect and refers to and derive various change, all do not depart from the scope of the utility model.And it is therein Illustrate and illustrate inherently to carry out general illustrate for the ease of popular understanding and be used, rather than is to the utility model Limitation.

If Fig. 2A, 2B show a kind of chip provided by the utility model around the perspective view of line transformer, a kind of chip around Line transformer, whole is in π type structure, is made of magnet 1, magnetic sheet 2 and coil 3.

Magnet 1, be H-type structure, including center pillar 100 and extended perpendicularly outward from center pillar both ends of the surface the blade 110 to be formed, 120, two blades are symmetrical structure, and two base angles plating of blade 110 is two pin pads 1121,1122, in two pins Jagged 111 are opened up between pad 1121,1122；Two base angles plating of blade 120 is two pin pads 1221,1222, Jagged 121 are opened up between two pin pads 1221,1222.Theoretically come according to the circuit diagram of transformer shown in Fig. 2 C It sees, the primary and secondary coil of transformer can form two kinds of winding modes on the pin pad of magnet 1, and one is as shown in Figure 2 D, by The leading-out terminal of blade 110 and the ipsilateral two pins pad 1121,1221 of blade 120 as the first winding of transformer；Blade 110 Leading-out terminal with two pin pads 1122,1222 of the other side of blade 120 as the second winding；The notch of each blade 111,121 area is dielectrically separated between the first, second winding of transformer (i.e. primary and secondary).Such winding mode, in order to guarantee Meet the miniaturization that volume of transformer is taken into account while pin isolation distance requirement between primary and secondary, the magnet that two blades are surrounded is whole The aspect ratio range of body need to be between 1:1~1:1.2.Secondly as shown in Figure 2 E, by the pin pad 1121,1122 of blade 110 The as leading-out terminal of the first winding；The pin pad 1221,1222 of blade 120 is the leading-out terminal of the second winding；Two leaves Interval dead zone between piece is primary and secondary, transformer and is dielectrically separated from area.Such winding mode is naturally full because of interval dead zone The requirement of pin isolation distance between sufficient primary and secondary, therefore the magnet overall dimensions that two blades are surrounded are without considering isolation spacing Restricted problem, also the restricted designed condition without length-width ratio.

Come to carry out in conjunction with principle and embodiment of the attached drawing to utility model by taking the first winding mode as an example below detailed Explanation.

A kind of chip provided by the utility model around line transformer (below can abbreviation be chip transformer) as shown in Figure 2 A, It is made of " H " type magnet 1, " I " type magnetic sheet 2 and coil 3.

The utility model is illustrated in figure 3 around the perspective view of " H " type magnet of line transformer, " H " type magnet 1, preferably Using the nickel-zinc ferrite material of high resistivity, structure is designed as a center pillar 100, and center pillar 100 is derivative to both ends, along center pillar 100 ring weeks tool there are two longitudinal with middle axis of a cylinder two blade 110,120 (because it constitutes the side wall of transformer, below can also image Be known as lateral plate).To keep volume of transformer more optimized with isolation effect, length-width ratio between lateral plate 110,120 be 1:1~ 1.2, the aspect ratio range for the magnet entirety that two lateral plates are surrounded in other words is between 1:1~1:1.2；Center pillar 100 is square, circle The uniform shape body such as shape, ellipse；It metallizes respectively four ends (1121,1122,1221,1222) of lateral plate 110,120 Two base angles plating of two lateral plates is two pin pads by processing；The end of lateral plate 110,120 is parallel to center pillar and is equipped with Notch 111,121, the electrical isolation spacing between primary and secondary coil pin to form transformer；Between notch 111,121 Away from 1.0mm is greater than, to form the strict demand met to the electrical isolation spacing of transformer；Lateral plate 110 be equipped with wire casing 1131, 1132, lateral plate 120 is equipped with wire casing 1231,1232, and wire casing 1131 to center pillar has slanting conducting wire ditch 1141, and wire casing 1132 arrives center pillar There is slanting conducting wire ditch 1142, wire casing 1231 to center pillar has slanting conducting wire ditch 1241, and wire casing 1232 to center pillar has slanting lead Duct 1242.In the pin pad area of the recessed lateral plate bottom in " H " type magnet of each wire casing, wire casing is located at the bottom surface of lateral plate, line Slot is detent slot, and the shape of wire casing is semicircle orifice, and the groove width of wire casing and the line footpath of coiling are suitable, the groove depth of wire casing be less than coil around The line footpath of line, the i.e. groove depth of wire casing are not more than groove width, for accommodating the line end of coil, and make line end card in the inner, without mistake More activity space, to better ensure that transformer is not easy positioning due to molten tin when carrying out patch Reflow Soldering on PCB.Wire casing Cambered surface and lateral plate end all have metal coating, the metal coating of lateral plate end be used as again patch functional surfaces can with PCB hollow plate and Other SMT components pass through reflow soldering process after piece uploading together and realize electrical connection.Lateral plate 110 is equipped with conducting wire ditch close to center pillar side 1141,1142, lateral plate 120 is equipped with conducting wire ditch 1241,1242 close to center pillar side, and conducting wire ditch is inclined oblique by one end of wire casing To center pillar is connected to, tilt angle is matched with the coiling angle of lead and the vertical height of lateral plate and center pillar, and function is to hold Avoiding for support guidance lead is hanging；Conducting wire ditch also forms the resistance tin band between the scolding tin of wire casing and the coil packet of center pillar.Because of conducting wire The structure of ditch be face of slope, can also image be known as conducting wire slope.It is the plane of grinding at the top of lateral plate, is ground under special occasions Plane can be " mirror surface " attrition process, be conducive to reduce and the contact gap after the assembling of " I " type magnetic sheet.

Further, " H " type magnet is process by the soft magnetic ferrite with high magnetic permeability, high resistivity, high magnetic conductance Rate can guarantee that transformer obtains biggish inductance, and high resistivity guarantees the insulation performance of magnet itself.When the material of magnet It, can for center pillar winding portion in the occasion that need to specifically meet safety requirement when selecting the ferrites such as nickel zinc, MnZn, MnZn The insulating strength between magnet and coil is carried out in such a way that increase includes but is not limited to additional coating, medium etc..

The utility model chip is illustrated in figure 4 around the perspective view of " I " type magnetic sheet of line transformer, " I " type magnetic sheet 2, by Soft magnetic ferrite with low magnetic permeability, high resistivity is process, and magnetic sheet size etc. is wider than " H " type magnet but is longer than " H " type Magnet, it is both wings 205 that " I " type magnetic sheet 2, which is longer than the outwardly directed part of " H " type magnet institute,." I " type magnetic sheet 2 is equipped with groove 210, The side panel length of the length of groove 210 and " H " type magnet is close, and groove 210 is made to form a concave plane in the bottom surface of magnetic sheet 2. Preferably, when " I " type magnetic sheet and " H " type magnet are assembled, assembly positioning datum of the set groove as magnet and magnetic sheet, The rigging position of magnet and magnetic sheet is positioned, positioning limit is played the role of, and bonding skew can be prevented." I " type magnetic sheet 2 The half bore 201,202 for exposing magnet top surface is offered in the exterior rim of end face, it is similar to single stamp hole structure, to form magnet With the dispensing position of magnetic sheet, it is adhesively fixed for what magnet group both entered after magnetic sheet, so by reducing gluing junction between the two Product, influence of the reduction non-magnetic material to the electromagnetic property of magnetic closed circuit as far as possible, to ensure the reliability of transformer work.Half Hole 201,202 is the small recess in the end face exterior rim of magnetic sheet 2, and aperture is less than the thickness of blade, but half-round cross hole, be can also be The other shapes that cross-sectional shape is surrounded by the exterior rim and encapsulation curve of end face, such as arc-shaped through-hole.And half bore can be set There are two or more the number of openings.The top surface of " I " type magnetic sheet 2 may be provided with the first pin mark at the first pin Point, for distinguishing the first pin of transformer.

Be illustrated in figure 5 perspective view of the utility model chip after " H " type magnet spiral of line transformer, coil 3 by Two electromagnetic wire coilings that are independent and insulating each other form.Coil plays take-up and is placed in the wire casing of lateral plate, plays take-up and draws Line is wound on center pillar by conducting wire ditch with various canoes.Preferably, two coils are the primary and secondary line of chip transformer Circle, in multiple distribution system or divides column coiling state, wire circle is indefinite.

If Fig. 2A, 2B show the utility model chip around the perspective view of line transformer, Fig. 4 show the utility model piece Formula is mounted in PCB circuit board around line transformer in the utility model chip and makes around the perspective view of " I " type magnetic sheet of line transformer When at micropower modular power source, groove can be opened up in PCB circuit board, the magnet 1 of transformer is sunken in groove, and passes through magnetic sheet 2 It is longer than 1 outwardly directed 205 frame of both wings of institute of magnet in PCB circuit board, is produced so as to further decrease micro- functional module power supply The overall height dimension of product.

As shown in fig. 6, for the utility model chip around line transformer manufacturing method flow chart, process flow packet Include following steps:

1, magnet forms: as the main material of chip transformer, " H " type magnet, " I " type magnetic sheet are by professional magnetic material Expect that manufacturer according to design requirement, forms according to the processing technology of ferrite magnetic material and fires.Processing of this utility model for magnetic material Technique and process do not repeat excessively, but contour structures for magnet and magnetic material material can use field according to specific product Research and development demand selected.

2, " H " type magnet is reprocessed: for power transformer, needing to have centainly between primary and secondary in the occasion of default Be dielectrically separated from demand, " H " type magnet itself not only carries coil, the conductive coating on lateral plate also transition realize coil with Electrically connecting between PCBA (i.e. piece uploading is completed the resulting semi-finished product of entire processing procedure together with the components such as PCB hollow plate and SMT) Connect, thus when practice in " H " type magnet center pillar and lateral plate partially over the coating of some dielectrics, package, stickup etc. The insulation processing of ontology is carried out to reach being dielectrically separated between magnet and coil.

3, coiling is fixed: by spooling equipment by electromagnetic wire (including being not limited to the plain conductors such as enameled wire, insulated wire) Using Dan Rao and around or other winding methods, the multiple coils of coiling on center pillar.The lead of coil is tied up via conducting wire ditch respectively In wire casing, then it is by melting the modes such as weldering, Pressure Welding, soldering that lead ends, metallic channel, metal coating is welded.Due to Down-lead card is in metallic channel, and when subsequent reflow welds patch, the metal coating of multiple lateral plates coplanar can meet more accurately after welding Coplane degree.

4, " I " type magnetic sheet is bonded: " I " type magnetic sheet and the cooperation of " H " type magnet being assembled, the two lateral plates insertion of " H " type magnet Among the groove of " I " type magnetic sheet, two apertures on " I " type magnetic sheet are aligned with two lateral plates of " H " type magnet respectively, in aperture and side The place of combining of piece is bonded using colloid, further can be in the outer wall junction 401,402 of " I " type magnetic sheet and two lateral plates Increase colloid, so that it is bonding in the special operation environment such as some encapsulatings, plastic packaging with " H " type magnet to increase " I " type magnetic sheet Intensity.High-temperature baking is carried out after bonding, forms chip transformer after colloid solidification.

5, the spies such as inductance, leakage inductance, quality factor, insulation pressure voltage Characteristics Detection: are carried out to the chip inductor made Property carries out test assessment.

Above are merely preferred embodiments of the utility model, it is noted that above-mentioned preferred embodiment should not regard For limitations of the present invention, the protection scope of the utility model should be defined by the scope defined by the claims..For For those skilled in the art, without departing from the spirit and scope of the utility model, it can also make several Improvements and modifications, these improvements and modifications also should be regarded as the protection scope of the utility model.

Claims (10)

1. a kind of chip is being provided with the first pin identification point at the first pin, it is characterised in that: whole around line transformer Body is in π type structure, is made of magnet, magnetic sheet and coil,

Magnet is H-type structure, extends perpendicularly outward the blade to be formed, two bottoms of blade including center pillar and from center pillar both ends of the surface Angle plating is two pin pads, opens up jagged between two pin pads, is recessed with wire casing, wire casing in pin pad area Groove depth be not more than groove width, 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；It is offered in the exterior rim of end face and exposes magnet top surface Recess；The length of magnetic sheet is longer than magnet；Wherein,

Coil is wound on the center pillar of magnet, and magnetic sheet is placed on magnet, is determined by the concave plane of magnetic sheet the rigging position of magnet Position, and being adhesively fixed for magnetic sheet and magnet is carried out in the indent dispensing of magnetic sheet.

2. chip according to claim 1 is around line transformer, it is characterised in that: the magnet, the blade at center pillar both ends Respectively the first blade and the second blade, the pin pad of the first blade are the leading-out terminal of the first winding；Second blade Pin pad is the leading-out terminal of the second winding；Between two blades interval dead zone be primary and secondary, transformer insulation every From area.

3. chip according to claim 1 is around line transformer, it is characterised in that: the magnet, the blade at center pillar both ends Respectively the first blade and the second blade, the first blade and the ipsilateral two pins pad of the second blade are the exit of the first winding The two pins pad of son, the first blade and the second blade other side is the leading-out terminal of the second winding, and the notch of each blade is to become Depressor primary and secondary is dielectrically separated from area；The length-width ratio of the magnet is 1 to 1 to 1 to 1.2.

4. chip according to claim 1 is around line transformer, it is characterised in that: the blade top surface of the magnet is ground to mirror Facial plane.

5. chip according to claim 1 is around line transformer, it is characterised in that: the middle column outer wall of the magnet has additional absolutely Edge layer.

6. chip according to claim 1 is around line transformer, it is characterised in that: the recess is half-round cross hole, recess Bore is less than the thickness of blade.

7. chip according to claim 1 is around line transformer, it is characterised in that: in the knot of magnetic sheet and the blade outer wall of magnet Dispensing position is added at conjunction.

8. chip according to claim 1 is around line transformer, it is characterised in that: the conducting wire slope of the magnet is connection wire casing With the face of slope of center pillar.

9. a kind of micropower modular power source, comprising chip described in any item of the claim 1 to 8 around line transformer and PCB electricity Road plate, it is characterised in that: chip is mounted in PCB circuit board around line transformer.

10. a kind of micropower modular power source, comprising chip described in any item of the claim 1 to 8 around line transformer and PCB electricity Road plate, it is characterised in that: groove is opened up in PCB circuit board, chip is sunken in groove around the magnet of line transformer, and passes through magnetic sheet It is longer than the outwardly directed both wings frame of magnet institute in PCB circuit board.