CN202695101U

CN202695101U - Assembled planar transformer

Info

Publication number: CN202695101U
Application number: CN 201220373112
Authority: CN
Inventors: 俞广志
Original assignee: NANJING CIILIC ELECTRONICS CO Ltd
Current assignee: NANJING CIILIC ELECTRONICS CO Ltd
Priority date: 2012-07-31
Filing date: 2012-07-31
Publication date: 2013-01-23
Anticipated expiration: 2022-07-31

Abstract

The utility model provides an assembled planar transformer which comprises a pair of plane magnetic cores which are vertically symmetrical, and a winding board arranged between the two plane magnetic cores, wherein the two plane magnetic cores which are vertically symmetrical penetrate through the winding board and are bonded together, and the winding board is formed by a plurality of layers of printing circuit boards; one or more winding boards are provided, the primary windings of each winding board are connected in series, and secondary windings are connected in series or mutually independently. By adopting the winding board process, the manufacture cost of the printed circuit boards can be greatly reduced, and the material cost, the manufacture cost and the production cycle of the assembled planar transformer are greatly reduced.

Description

A kind of assembly type flat surface transformer

Technical field:

The utility model relates to a kind of novel assembled flat surface transformer, belongs to the transformer technology field.

Background technology:

Transformer is by electromagnetic induction principle, with identical frequency, at a kind of rest energy conversion electric equipment of two or more winding Transforms voltages or electric current.Transformer is various electronic installation, indispensable basic module during such as the running such as power supply unit or power supply change-over device, wherein have little, lightweight etc. the characteristics of volume with the transformer of high frequency again, can be used for to reach the power supply of frivolous requirement, and along with electronic installation under the trend development of miniaturization, slimming etc., transformer also needs the direction improvement of and flat structure little towards volume, so flat surface transformer will be the trend of power transformer development.

Traditional coiling transformer, generally comprise the insulation material coil brace, be wrapped in coil on the coil brace, be coated on the materials such as iron core outside the coil and insulating tape, generally all by artificial coiling, during production in enormous quantities, has the error rate height, consistency is poor, and the shortcomings such as check difficulty can cause whole electronic installation qualification rate not high simultaneously.

Because traditional transformer generally forms coil windings by the round copper conductor on FERRITE CORE, therefore the utilance of copper conductor can not be fully used, this situation is especially obvious when high frequency, and this is because due to the electric current skin effect that produces under the high-frequency work condition.

Flat surface transformer, its winding is to apply copper on multilayer board or the one group of flat conductive plane that directly uses copper coin to form, although because the skin effect electric current concentrates trend at outer surface, but the electric current whole wire of still flowing through concerning it, this compares with the cylindrical, linear wire and has improved total current density, compare with the wire-wound transformer of routine like this, flat surface transformer just can obtain higher conversion efficiency and power density.

Pcb board has developed into two-sided, multilayer from single face since being born.It is on insulating substrate, and by predetermined design, the conductive pattern of making printed wiring, printed component or being combined into by both is covered with the Copper Foil line and as wire in the printed board.Different as winding coil from traditional transformer adopting copper conductor, the flat surface transformer that adopts printed circuit board (PCB) (PCB) to make adopts mechanization production fully, have characteristics such as producing low mistake, performance height, high conformity, can obtain simultaneously higher rule density and relatively low plurality of advantages such as volume (when power density improves greatly, volume but dwindles greatly) so that flat surface transformer obtains a large amount of application in high-end power-supply device.

Because the requirement of transformer voltage ratio, the essential multilayer board that adopts of flat surface transformer, although plane P CB transformer is compared advantages with common wire-wound transformer, because the manufacturing cost of multilayer printed circuit board is very expensive, fabrication cycle is long, design is complicated, and that traditional wire-wound transformer has a cost is low, easy to make simple, technical maturity, the characteristics such as cycle weak point, simplicity of design, therefore modern Switching Power Supply a large amount of use remain wire-wound transformer.

The main producing process of pcb board is that 1,2,4,6,8 laminates are maturation process, processing thickness is usually less than 2mm, if the required copper layer more than 12 layers of processing plane transformer, the pcb board of the above thickness of 4mm, the ability that exceeds a lot of PCB processing enterprise, namely enable processing, cost also is difficult to bear.How can adopt the pcb board technology of present maturation, by appropriate combination, produce the flat surface transformer that meets the demands, be conducive to greatly applying of flat surface transformer.

Summary of the invention

The purpose of this utility model is, a kind of flat surface transformer that efficiently can freely assemble is provided, and than common plane transformer more flexibility and interchangeability is arranged in actual applications, and can effectively reduce material cost and the circulating fund that takies still less.

For reaching above-mentioned purpose, the utility model adopts following technical scheme:

A kind of assembly type flat surface transformer, it comprises a secondary laterally zygomorphic planar magnetic core, and be arranged on winding plate between two planar magnetic cores, and two planar magnetic cores of upper and lower symmetry pass the winding plate and bond together, and described winding plate (pcb board) adopts multilayer board to be made;

Described winding plate arranges one or more, and every block of winding plate comprises a coil windings at least, and the armature winding of each winding plate is connected mutually, and secondary winding is connected mutually or be independent mutually.

Further design of the present utility model is that the armature winding of each winding plate is drawn by half hole technique with secondary winding and linked terminal, and the link terminal is positioned at the pcb board both sides.

Every block of winding plate (pcb board) is formed by the print circuit plates making of the identical or different number of plies, every block of winding plate has a coil windings at least, this coil windings is armature winding or secondary winding, perhaps has simultaneously an armature winding and one or more secondary winding.

One or more winding plate assembly and connection is on the objective circuit plate, and two planar magnetic cores pass the winding plate and bond together.

The multilayer printed circuit board of every block of winding plate, it is screen that Copper Foil is laid on upper and lower top layer, and inner each layer laid coil windings, and as armature winding or secondary winding, the coil windings of each layer is by inner buried via hole series connection.

Described planar magnetic core is the plane magnetic ferrite magnetic core.

The utility model has following advantage compared to existing technology:

The utility model is intended to solve the problem that runs in the flat surface transformer manufacturing process, adopt prior art and technique, by a large amount of experimental verification design a kind of can with the suitable flat surface transformer of common wire-wound transformer cost, it is satisfying under the condition of technical performance, solve the technical barrier that wire-wound transformer is produced in enormous quantities, also solved long shortcoming of flat surface transformer test period simultaneously.The utility model can be with flat surface transformer technology large-scale application low power applications occasion.

The utility model is made Switching Power Supply to large-scale production and is had high promotional value.

Armature winding is by separately splicing ear series connection between the winding plate, and the armature winding number of turn is all winding plate sums; Secondary winding can be in series also can be independent mutually, if be in series then the secondary winding number of turns be all winding plate secondary winding summations, if independence, then each secondary winding is exactly an independently winding.

The utility model can adopt combined, the connection of different types of winding plate.Can make plurality of specifications and multiduty flat surface transformer.

External connection structure is arranged at the relative end, both sides of printed circuit board (PCB), adopts half hole technique, can use surface mounting technology, and is convenient for assembly on any electronic product.

The utility model can adopt polylith winding plate freedom and flexibility assembling collocation, forms different elementary, the secondary coil number of turn, can satisfy the series of products that different input and output voltages requires.Employing winding plate technique can significantly reduce the manufacturing cost of printed circuit board (PCB), material cost, manufacturing cost and the production cycle of having reduced widely product.

Description of drawings:

Fig. 1 is the building block principle figure one of the utility model winding plate.

Fig. 2 is the building block principle figure two of the utility model winding plate.

Fig. 3 is the structural representation of winding plate.

Fig. 4 is the utility model assembly type flat surface transformer structural representation.

Fig. 5 is tight directly contact assembling mode one diagram of bowing of this flat surface transformer.

Fig. 6 is that this flat surface transformer closely directly contacts assembling mode one end view.

Fig. 7 is positioned at the vertical view of the assembling mode two of Target Board both sides for this flat surface transformer.

Fig. 8 for this flat surface transformer be positioned at the Target Board both sides the end view of assembling mode two.

Among Fig. 1, Fig. 2: 1-8 is the tie point of winding plate.

Among Fig. 5-Fig. 8: the 1-Target Board; The 2-magnetic core; Pa-upper strata pcb board; Pb-lower floor pcb board.

Embodiment:

Copper Foil line in the printed circuit board (PCB) (pcb board) forms coil, and magnetic core is looped around the periphery of coil, and syndeton is arranged on end, printed circuit board (PCB) both sides, and an end is the armature winding leading-out terminal, the other end is the secondary winding leading-out terminal, can directly be welded on the objective circuit plate.

The winding plate adopts multilayer (such as eight layers) printed circuit board (PCB) usually, and every printed circuit board comprises two windings usually, an armature winding, a secondary winding; The internal layer of printed circuit board (PCB) is coil, outer two-layer be copper foil shielding layer, be the PCB insulating barrier between layers, realize electrical isolation.Every layer coil turn can be designed to 1～N (the N size is relevant with the window size of magnetic core) circle, and interlayer connects by inner buried via hole.

Usually the armature winding of every block of winding plate is series system, and secondary winding is separate, and splicing ear is distributed in winding plate both sides, can realize multichannel output, because the FR-4 glass-epoxy plate that PCB adopts has good insulation characterisitic, therefore can conveniently make the Switching Power Supply of high isolation.

The assembling mode of every block of winding plate is: the winding plate is contact closely directly, or be distributed in objective circuit plate both sides and with objective circuit plate close contact.

Embodiment one:

Adopt the mounting means of Fig. 1, two blocks of winding plates stack direct close contact, and two blocks of winding plates respectively are provided with an armature winding and a secondary winding.The armature winding of two blocks of winding plates is in series, and secondary winding is separate, and then the link terminal by the winding plate is welded on the objective circuit plate.

Embodiment two:

Adopt the mounting means of Fig. 2, two blocks of winding plates are welded direct to the both sides of objective circuit plate, two blocks of winding plates respectively are provided with an armature winding and a secondary winding.The armature winding of two blocks of winding plate plates is in series, and secondary winding is in series, and then the link terminal by the winding plate is welded on the objective circuit plate.

Example of making one:

This example has designed two kinds of winding plates, and transformer only uses this two kinds of winding plates, can be combined into six sections of flat surface transformer products, and is specific as follows:

Two kinds of winding plate P1, P2 of this flat surface transformer, all adopt the pcb board of 8 layers of structure, upper and lower top layer is used for shielding, 6 layers of internal layers are used for winding, wherein 4 layers are used for armature winding, and 2 layers are used for time rank winding, and the plane FERRITE CORE is used FEE16, the magnetic core window width is 4mm, and every layer of maximum number of turns is 5 circles.

Winding plate P1, armature winding 20 circles, secondary winding 4 circles; Namely the 4 layers of every layer line circle of armature winding number of turn 5 are enclosed, 2 hierarchical level windings, the every layer line circle number of turn 2 circles.

Winding plate P2, armature winding 20 circles, secondary winding 5 circles.Namely the 4 layers of every layer line circle of armature winding number of turn 5 are enclosed, one deck coil turn 2 circles in the 2 hierarchical level windings, and another layer line circle number of turn is 3 circles.

The compound mode of six kinds of flat surface transformers is respectively:

1, P1 and P1 combination, armature winding series connection (40 circle), secondary winding is independent, the first secondary winding 4 circles, second subprime winding 4 circles;

2, P1 and P1 combination, armature winding series connection (40 circle), secondary winding series connection, only secondary winding 8 circles;

3, P2 and P2 combination, armature winding series connection (40 circle), secondary winding is independent, the first secondary winding 5 circles, second subprime winding 5 circles;

4, P2 and P2 combination, armature winding series connection (40 circle), secondary winding series connection, only secondary winding 10 circles;

5, P1 and P2 combination, armature winding series connection (40 circle), secondary winding is independent, the first secondary winding 4 circles, second subprime winding 5 circles;

6, P1 and P2 combination, armature winding series connection (40 circle), secondary winding series connection, only secondary winding 9 circles.

Claims

1. assembly type flat surface transformer, it comprises a secondary laterally zygomorphic planar magnetic core, and be arranged on winding plate between two planar magnetic cores, and two planar magnetic cores of upper and lower symmetry pass the winding plate and bond together, and described winding plate is by adopting multilayer board to be made;

It is characterized in that: described winding plate arranges one or more, and every block of winding plate comprises a coil windings at least, and the armature winding of each winding plate is connected mutually, and secondary winding is connected mutually or be independent mutually.

2. according to right 1 described assembly type flat surface transformer, it is characterized in that:

The armature winding of each winding plate is drawn by half hole technique with secondary winding and is linked terminal, and the link terminal is positioned at the pcb board both sides.

3. according to right 1 or 2 described assembly type flat surface transformers, it is characterized in that:

Every block of winding plate is formed by the print circuit plates making of the identical or different number of plies, every at least one coil windings that the winding plate has, and this coil windings is armature winding or secondary winding, perhaps has simultaneously an armature winding and one or level winding repeatedly.

4. according to right 1 described assembly type flat surface transformer, it is characterized in that:

5. according to right 1 described assembly type flat surface transformer, it is characterized in that:

The Multilayer printed circuit board structure of every block of winding plate, it is screen that Copper Foil is laid on upper and lower top layer, and inner each layer laid coil windings, and as armature winding or secondary winding, the coil windings of each layer is by inner buried via hole series connection.

6. according to right 1,2,4 or 5 described assembly type flat surface transformers, it is characterized in that: described planar magnetic core is the plane magnetic ferrite magnetic core.