CN208189370U - A kind of flat surface transformer and electronic equipment - Google Patents

A kind of flat surface transformer and electronic equipment Download PDF

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Publication number
CN208189370U
CN208189370U CN201820569220.XU CN201820569220U CN208189370U CN 208189370 U CN208189370 U CN 208189370U CN 201820569220 U CN201820569220 U CN 201820569220U CN 208189370 U CN208189370 U CN 208189370U
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coil
pcb
magnetic core
flat surface
flatwise
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闵运胜
赵斌
徐旭
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Youerte Electronics (shenzhen) Co Ltd
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Youerte Electronics (shenzhen) Co Ltd
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Abstract

The utility model relates to planar transformer technology fields, more particularly to a kind of flat surface transformer and electronic equipment.Wherein, flat surface transformer includes the first magnetic core, at least one PCB winding, at least one flatwise coil and the second magnetic core, each PCB winding in the first magnetic core, at least one PCB winding, each flatwise coil and the second magnetic core is concentric is assembled into flat surface transformer at least one flatwise coil.On the one hand, since using PCB winding and flatwise coil, as primary/secondary coil, relatively traditional coiled wire-wound coil has stronger overcurrent capability.On the other hand, when needing to design the more primary/secondary coil of the number of turns, due to the flatwise coil of the utility model can laterally increase/reduce the number of turns, therefore, its can relatively avoid the need for assembly multilayer just/secondary coil, and then kindred effect and parasitic capacitance are reduced, and improve power density and reduce temperature rise.

Description

A kind of flat surface transformer and electronic equipment
Technical field
The utility model relates to planar transformer technology fields, more particularly to a kind of flat surface transformer and electronic equipment.
Background technique
Transformer realizes the conversion of voltage using electromagnetic induction principle.Transformer includes primary coil, secondary coil and magnetic Core, in general, user according to product demand, can voluntarily adjust the number of turns of primary coil or secondary coil and constitute transformer. For example, referring to Fig. 1, Fig. 1 is that traditional technology provides a kind of schematic illustration of flat surface transformer.As shown in Figure 1, user passes through Multilayer primary coil and secondary coil are alternately arranged and constitute flat surface transformer.
In the implementation of the present invention, discovery traditional technology is the prior art has at least the following problems: due to just/secondary wire by inventor The number of plies of circle is more, and kindred effect is bigger, and also increases the parasitic capacitance of flat surface transformer, so as to cause flat surface transformer Power density is small, inefficiency.
Utility model content
One purpose of the utility model embodiment is intended to provide a kind of flat surface transformer and electronic equipment, power density ratio It is larger and high-efficient.
In order to solve the above technical problems, the utility model embodiment the following technical schemes are provided:
In a first aspect, the utility model embodiment provides a kind of flat surface transformer, including the first magnetic core, at least one PCB winding, at least one flatwise coil and the second magnetic core, each PCB in first magnetic core, at least one described PCB winding Each flatwise coil and second magnetic core is concentric is assembled into the plane transformation in winding, at least one described flatwise coil Device.
Optionally, at least one described PCB winding each PCB winding with it is each flat at least one described flatwise coil Flat coil alternately assembles.
Optionally, whole PCB winding at least one PCB winding described in series/parallel.
Optionally, whole flatwise coils at least one flatwise coil described in series/parallel.
Optionally, the flatwise coil includes Alpha's flatwise coil.
Optionally, the PCB winding is armature winding, and the flatwise coil is secondary windings;Alternatively, the PCB winding For secondary windings, the flatwise coil is armature winding.
Optionally, PCB winding includes M layers of PCB coil, and every layer of PCB coil of the M layers of PCB coil can be used as primary line Circle or secondary coil, and in the PCB winding, primary coil replaces assembly with secondary coil, and M is positive integer, and M >=1.
Optionally, first magnetic core or second magnetic core include pedestal, the first side wall, second sidewall and magnetic core Column, the first side wall are set to pedestal side, and second sidewall is set to the pedestal other side, and the first side wall is opposite with second sidewall, magnetic Stem is set to the middle part of pedestal.
Optionally, the side of the first side wall towards the magnetic core column is provided with the first groove, the second sidewall court The side of the magnetic core column is provided with the second groove;
The PCB winding includes the first protrusion and the second protrusion, and first protrusion is fastened in first groove, institute The second protrusion is stated to be fastened in second groove.
In second aspect, the utility model embodiment provides a kind of electronic equipment, including described in any item plane transformations Device.
In each embodiment of the utility model, flat surface transformer includes the first magnetic core, at least one PCB winding, at least One flatwise coil and the second magnetic core, each PCB winding, at least one flatwise coil in the first magnetic core, at least one PCB winding In each flatwise coil and the second magnetic core is concentric is assembled into flat surface transformer.On the one hand, due to using PCB winding and flat wire Circle is used as primary/secondary coil, and relatively traditional coiled wire-wound coil has stronger overcurrent capability.On the other hand, when needs are set When counting the more primary/secondary coil of the number of turns, due to flatwise coil of the invention can laterally increase/reduce the number of turns, It can relatively avoid the need for assembly multilayer just/secondary coil, and then reduce kindred effect and parasitic capacitance, and improve function Rate density and reduction temperature rise.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is that traditional technology provides a kind of schematic illustration of transformer;
Fig. 2 is that the utility model embodiment provides a kind of decomposition diagram of flat surface transformer;
Fig. 3 is the structural schematic diagram of the first magnetic core in Fig. 2;
Fig. 4 is the structural schematic diagram of PCB winding in Fig. 2;
Fig. 5 is the structural schematic diagram of flatwise coil in Fig. 2;
Fig. 6 is that the utility model embodiment provides a kind of principle schematic diagram of flat surface transformer;
Fig. 7 is that another embodiment of the utility model provides a kind of principle schematic diagram of flat surface transformer;
Fig. 8 is that the utility model embodiment provides a kind of flow diagram of flat surface transformer production method;
Fig. 9 is the flow diagram of step 83 in Fig. 8;
Figure 10 is the flow diagram of step 81 in Fig. 8.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this Utility model is not used to limit the utility model.
Before illustrating the utility model embodiment, A brief introduction first is made to kelvin effect and kindred effect herein.Collect skin Effect refers to when having alternating current or alternating electromagnetic field in conductor, and current convergence is the conductor appearance thin layer the phenomenon that.Neighbouring effect When should refer to when high-frequency current the flowing reversely with each other in two conductors or flow in a reciprocal conductor, electric current, which can be concentrated in, is led The special physical phenomenon of one kind of body adjacent side flowing.Kelvin effect and kindred effect all reduce the performance of high frequency transformer.? In high frequency transformer, in contrast, in the flat surface transformer using flat structure coil, multilayer kindred effect compares kelvin effect It is more serious.Conductive area is only limited in a part on surface and increases copper loss by kelvin effect, it does not change electric current good fortune Value, only changes the current density on coiling surface.And drawn in kindred effect by the variable magnetic field that adjacent coil layers electric current generates The vortex risen, size exponentially increase with the increase of the coil number of plies.
Therefore, such as preceding elaboration traditional technology, kindred effect is great on the influence of transformer working performance.Also, it passes The transformer that system technology provides also results in AC/DC impedance ratio (FR=RAC/RDC) obviously increase.
Based on this, the utility model embodiment provides a kind of flat surface transformer.Wherein, which can be applied to Each class of electronic devices, for example, the electronic equipment is power-supply device or motor driving apparatus etc..
Referring to Fig. 2, flat surface transformer 200 includes the first magnetic core 21, PCB winding 22, flatwise coil 23 and the second magnetic core 24.In some embodiments, the quantity of PCB winding 22 can be one, can also be two or more.The quantity of flatwise coil 23 It can be one, can also be two or more.As shown in Fig. 2, flat surface transformer 200 includes that 3 PCB windings 22 and 3 are flat Flat coil 23, user can voluntarily select the PCB winding and flatwise coil of corresponding number according to product demand.
The magnetic metal oxide that first magnetic core 21 or the second magnetic core 24 can be made of iron oxide mixture.On for example, Stating magnetic core can be made using manganese-zinc ferrite and nickel-zinc Ferrite Material.Above-mentioned magnetic core can be any appropriate shape Shape, for example, " E " type magnetic core etc..
PCB winding 22 can be made using following methods: provide the metal form and non-metallic insulation of prefabricated figure Metal form is placed in particular manufacturing craft by medium, and non-metallic insulation medium is laid in up and down the two of metal form respectively Face melts non-metallic insulation medium, so as to non-metallic insulation media packs metal form and form product substrate.According to product need It asks, the product substrate of corresponding number is laminated, the product substrate of corresponding number after stacking is cut, to form PCB winding.Each product Overlapped way between substrate includes: the product substrate corresponding position processing fixation hole after stacking and makes to fix hole metallization, To form plated through-hole, aperture, shape and the quantity of plated through-hole are determined according to the operating current of circuit board.By Related product substrate Lamination is carried out by technology hole, further to process, user can form final PCB winding according to the design needs.
Wherein, include several copper foil regions with the metal form of prefabricated figure, by copper foil region connected it is discrete Element is different, and the copper foil circuit width positioned at copper foil region will be different.The metal form includes copper foil template, aluminium foil template And other material templates etc., wherein the copper foil template can be red copper template.
In order to realize that PCB winding can select the metal of corresponding thickness according to product demand by high current, user Template is to make circuit board.For example: being copper foil template as example using metal form, user, which can choose thickness, to be 30oz to 200oz or copper foil template greater than 200oz, the copper foil template of this thickness range pass through in which can be realized high current.
In the present embodiment, user can select the non-metallic insulation medium of N layers of metal form and N+1 according to product demand It is laid and is melted, such as: when user needs 3 layers of metal form, it can choose 4 layers of non-metallic insulation medium and lay respectively Any metal form in this 3 layers of metal forms, wherein the adjacent surface of adjacent metal template shares same non-metallic insulation medium.
It is connected using metallization soldering hole by metallic conductor between each PCB winding, forms primary or secondary Grade.
In the present embodiment, PCB winding has the specific stress levels of safety and turn-to-turn stress levels.Meanwhile PCB winding has Overcoming for effect and faces side effect bring fuel factor at kelvin effect, passes through optimization copper layer thickness and interlayer spacings size, the line Circle has optimal AC DC impedance ratio, to substantially increase window utilization rate.
Flatwise coil 23 passes through narrow side radial direction and broadside axial direction coiling using the flat film envelope curve of certain specific stress levels Made of technique coiling.Due to the copper wire that the cross section of flatwise coil 23 is rectangle (square), cross section is different from as circle The conventional coil winding of shape, since the copper wire flattening of flatwise coil 23 passes through under the same window area of flat surface transformer Horizontal and vertical two around to winding, flatwise coil 23 is capable of providing sufficiently large window fill factor, therefore, the present embodiment The window fill factor of the flat surface transformer of offer is bigger, and window utilization rate is big.Since window fill factor is bigger, relatively The current density on ground, flatwise coil 23 is bigger, therefore the flat surface transformer can be by high current, and power to volume ratio is high, and And the temperature rise of the flat surface transformer is relatively low.
In the present embodiment, the first magnetic core 21, PCB winding 22, flatwise coil 23 and the second magnetic core 24 is concentric is assembled into Flat surface transformer 200.
When the quantity of PCB winding 22 is 1, and the quantity of flatwise coil 23 is 1, the first magnetic core 21, PCB winding 22, Flatwise coil 23 and the second magnetic core 24 is sequentially concentric is assembled into flat surface transformer 200.
When the quantity of PCB winding 22 is 2 or more, and the quantity of flatwise coil 23 is 2 or more, the first magnetic core 21, two Each PCB winding 22 in a above PCB winding, each flatwise coil 23 and the second magnetic core 24 are coaxial in more than two flatwise coils The heart is assembled into flat surface transformer 200.Wherein, user can select each PCB in two or more PCB winding according to product demand Rigging position relationship in winding 22 and more than two flatwise coils between each flatwise coil 23, for example, it can be following Rigging position relationship:
1, the first magnetic core-PCB winding-flatwise coil-PCB winding-flatwise coil-PCB winding-flatwise coil --- --- Two magnetic cores;
2, the first magnetic core-PCB winding-PCB winding-PCB winding-flatwise coil-PCB winding-flatwise coil-PCB winding- The second magnetic core of flatwise coil --- ---;
3, the first magnetic core-PCB winding-flatwise coil-PCB winding-PCB winding-PCB winding-flatwise coil-PCB winding- The second magnetic core of flatwise coil --- ---;
4, the first magnetic core-flatwise coil-flatwise coil-PCB winding-flatwise coil-PCB winding-flatwise coil-PCB around The second magnetic core of group-flatwise coil --- ---;
5, the first magnetic core-PCB winding-flatwise coil-PCB winding-flatwise coil-flatwise coil-flatwise coil-PCB around The second magnetic core of group-flatwise coil --- ---;
……
Foregoing rigging position relationship, at the 1st kind, each PCB winding 22 replaces assembly with each flatwise coil 23. It is surface insulated relatively good due to PCB winding, and PCB winding 22 replaces assembly with flatwise coil 23, thus assembles The kindred effect for the flat surface transformer that positional relationship is constituted is minimum, and performance is relatively good.
Therefore, because the flatwise coil that the present embodiment is adopted can not be excessive increase flatwise coil the number of plies, but increase Add the number of turns of each flatwise coil single layer, then alternately arranged form is layered using primary and secondary coil, therefore, in flat surface transformer While window area great utilization rate, overcome the negative effect of kelvin effect and kindred effect, reduce parasitic capacitance and Reduce leakage inductance, it is final to promote flat surface transformer overall power density and efficiency.
In the present embodiment, user can voluntarily determine PCB winding 22 with flatwise coil 23 as just according to product demand Grade winding or secondary windings, such as: whole PCB windings 22 are armature winding, and whole flatwise coils 23 are secondary windings;All PCB winding 22 is secondary windings, and whole flatwise coils 23 are armature winding;A part of PCB winding 22 is primary/secondary winding, Another part PCB winding 22 is secondary/armature winding, and similarly, a part of flatwise coil 23 is primary/secondary winding, another portion Dividing flatwise coil 23 is secondary/armature winding.
In the present embodiment, user can also be according to product demand, by part/whole PCB winding 22 and part/whole Flatwise coil 23 carries out series/parallel, such as: whole PCB winding 22 at least one PCB winding of series/parallel, series connection/simultaneously Join whole flatwise coils 22 at least one flatwise coil;Alternatively, by least one PCB winding part PCB winding 22 series connection/ Parallel connection, 22 parallel/series of another part PCB winding, flatwise coil 23 series/parallel in part at least one flatwise coil, separately A part of 23 parallel/series of flatwise coil;Alternatively, part PCB winding 22 at least one PCB winding is flat at least one Thiol divides the series/parallel together of flatwise coil 23, and another part PCB winding 22 is in parallel with another part flatwise coil 23/ Series connection.
To sum up, due to being used as primary/secondary coil using PCB winding 22 and flatwise coil 23, the two is small in size, therefore, Its volume for capableing of reduced plan transformer on the whole.On the other hand, when the primary/secondary coil for needing to design big the number of turns When, since flatwise coil 23 is under relatively small volume, it can laterally increase/reduce the number of turns, therefore, can relatively keep away Exempt to need to assemble multilayer just/secondary coil, and then reduce kindred effect and parasitic capacitance, and improve power density and reduce temperature It rises.
Referring to Fig. 3, the first magnetic core 21 is identical as the shape of the second magnetic core 24.It is example, the first magnetic with the first magnetic core 21 Core 21 includes pedestal 210, the first side wall 211, second sidewall 212 and magnetic core column 213, and the first side wall 211 is set to pedestal 210 Side, second sidewall 212 are set to 210 other side of pedestal, and the first side wall 211 and second sidewall 212 are opposite.Magnetic core column 213 is set It is placed in the middle part of pedestal 210, magnetic core column 213 is in cylindrical body.
Each PCB winding 22 of the flat surface transformer 200 replaces assembly with flatwise coil 23.
Referring to Fig. 4, PCB winding 22 is provided with axle center hole 221, several spliced eyes 222 and several metal apertures 223.Magnetic Stem 213 can run through axle center hole 221, and the diameter of axle center hole 221 is adapted with the diameter of magnetic core column 213.Spliced eye 222 be used for Flatwise coil 23 connects, and metal aperture 223 with external circuit or equipment for connecting.
Foregoing flatwise coil 23 can be single-layer flat coil, can also be two layers or more flatwise coil.
Referring to Fig. 5, flatwise coil 23 is Alpha's flatwise coil, the number of plies of Alpha's flatwise coil is 2 layers, every layer The number of turns of Alpha's flatwise coil is greater than or equal to 2 circles, for example, the number of turns of every layer of Alpha's flatwise coil is 3 circles.Flatwise coil 23 include coil input end 231 and coil output 232, and coil input end 231 is all plugged on corresponding with coil output 232 In spliced eye 222.Therefore, when assembly PCB winding 22 is with flatwise coil 23, user only needs to input the coil of flatwise coil 23 End 231 is plugged in the corresponding spliced eye 222 of PCB winding 22 with coil output 232, can quickly complete assembly.
Also referring to Fig. 3 to Fig. 5, the side of the first side wall 211 towards magnetic core column 213 is provided with the first groove 2111, The side of second sidewall 212 towards magnetic core column 213 is provided with the second groove 2122.
PCB winding 22 includes that the first protrusion 224 and the second protrusion 225, the first protrusion 224 are fastened on the first groove 2111 Interior, the second protrusion 225 is fastened in the second groove 2122.
Therefore, it can quickly be positioned by snap-in structure, PCB winding 22 and the first magnetic core 21 or the second magnetic core 24 and more Add and firmly assembles together.
When as very more such as the number of plies increase of the traditional technology that background technology part is illustrated, especially primary/secondary coil, For example, increasing up to 18 layers.Obviously, other than the defect for occurring being illustrated such as background technology part, and actually adding During work, manufacturing process is put forward higher requirements, causes production efficiency low.
However, when primary/secondary coil can greatly reduce neighbour for example, by using Alpha's coil using flatwise coil Nearly effect, provides power density.Referring to Fig. 6, flat surface transformer 200 includes 3 PCB winding 22 and 3 flatwise coils 23, PCB winding 22 is used as secondary coil, and flatwise coil 23 is used as primary coil.Each flatwise coil 23 shares two layers, shares 6 Circle, wherein every layer has 3 circles.Therefore, by selecting flatwise coil, great neighbour is generated relative to 18 layers of winding of traditional technology Nearly effect, it is clear that flat surface transformer provided in this embodiment can greatly reduce kindred effect.
In the present embodiment, in order to provide the current density of flatwise coil, further improve kelvin effect and kindred effect, User can choose the flatwise coil coiling of optimal thickness.For example, firstly, determined according to temperature increase requirement and current density hand over/it is straight Flow impedance ratio FR, for example, according to transformer require allow temperature rise and each transformer structure and dissipating-heat environment come The determination AC/DC impedance ratio F of selectionR, such as FR=1.5 or other values.Secondly, tabling look-up to obtain Q according to Dowell curve Value;Again, according to formula:Fl=NlH/ (h+s), calculates the optimal thickness of flatwise coil;Again, it selects optimal The flatwise coil when flatwise coil of thickness is as assembly, wherein NlFor every layer of the number of turns, s is conductor interlayer spacing distance, FlFor Layers of copper coefficient, h are the thickness of flatwise coil, and Δ is penetration depth.
It is big for transformer alternating circuit component, F is selected under normal conditionsR=1.5 is best, is confined to manufacturing process certainly Difficulty and window fill factor, FRValue can also increase, the maximum F that can be chosenRThe temperature rise that value can be born according to the coil Depending on range.FRIt increases, it, if being lower than 1.5, is more than minimum switch-back point that loss, which becomes larger, is needed with thinner thinner conducting wire, window Fill factor is reduced.It is tabled look-up by Dowell curve it is found that for example: working as FR=1.5, when the number of plies is 1, Q is about 1.6;The number of plies is 2 When, Q is about 1.1;When the number of plies is 3, Q value is about 0.8;When the number of plies is 10, Q is about 0.4.
Therefore, the utility model embodiment overcomes kelvin effect and kindred effect bring fuel factor, flat by optimizing The thickness and interlayer spacings size of flat coil, which has optimal AC DC impedance ratio, to substantially increase Window utilization rate.
Further, by calculating the thickness of optimal flatwise coil, kelvin effect can be improved and face side effect band The loss for the current cross section product come considerably increases the power of flat surface transformer so that coil be made to possess maximum current density Volume ratio.
In some embodiments, PCB winding 22 includes M layers of PCB coil, and every layer of PCB coil of M layers of PCB coil can be used as Primary coil or secondary coil, and in PCB winding, primary coil replace assembly with secondary coil, and M is positive integer, and M >=1.
Referring to Fig. 7, PCB winding 22 includes 9 layers of PCB coil, wherein 3 layers of front PCB coil is used as secondary PCB coil 22a, intermediate 3 layers of PCB coil are used as primary PCB coil 22b, behind 3 layers of PCB coil be used as secondary PCB coil 22c.
Therefore, user can be according to product demand, self manufacture PCB winding, and defines the primary line in each PCB winding The quantity of circle or secondary coil.
As the another aspect of the utility model embodiment, the utility model embodiment provides a kind of flat surface transformer production Method.Referring to Fig. 8, flat surface transformer production method 800 includes:
Step 81 provides the first magnetic core, at least one PCB winding, at least one flatwise coil and the second magnetic core;
Step 82, according to the number of turns between the primary coil and secondary coil of flat surface transformer, determine at least one PCB around In group in each PCB winding and/or at least one flatwise coil each flatwise coil series-parallel relationship and rigging position relationship;
Step 83, according to series-parallel relationship and rigging position relationship, will be each in the first magnetic core, at least one PCB winding Each flatwise coil and the second magnetic core is concentric is assembled into flat surface transformer in PCB winding, at least one flatwise coil.
In the present embodiment, user can according to product demand, select two or more PCB winding in each PCB winding and Rigging position relationship in more than two flatwise coils between each flatwise coil, for example, it can be closed for following rigging position System:
1, the first magnetic core-PCB winding-flatwise coil-PCB winding-flatwise coil-PCB winding-flatwise coil --- --- Two magnetic cores;
2, the first magnetic core-PCB winding-PCB winding-PCB winding-flatwise coil-PCB winding-flatwise coil-PCB winding- The second magnetic core of flatwise coil --- ---;
3, the first magnetic core-PCB winding-flatwise coil-PCB winding-PCB winding-PCB winding-flatwise coil-PCB winding- The second magnetic core of flatwise coil --- ---;
4, the first magnetic core-flatwise coil-flatwise coil-PCB winding-flatwise coil-PCB winding-flatwise coil-PCB around The second magnetic core of group-flatwise coil --- ---;
5, the first magnetic core-PCB winding-flatwise coil-PCB winding-flatwise coil-flatwise coil-flatwise coil-PCB around The second magnetic core of group-flatwise coil --- ---;
……
In the present embodiment, user can according to product demand, voluntarily determine PCB winding and flatwise coil as it is primary around Group or secondary windings, such as: whole PCB windings are armature winding, and whole flatwise coils are secondary windings;Whole PCB windings are Secondary windings, whole flatwise coils are armature winding;A part of PCB winding is primary/secondary winding, another part PCB winding For secondary/armature winding, similarly, a part of flatwise coil is primary/secondary winding, and another part flatwise coil is secondary/first Grade winding.
In the present embodiment, user can also be flat by part/whole PCB winding and part/whole according to product demand Flat coil carries out series/parallel, such as: whole PCB winding at least one PCB winding of series/parallel, series/parallel is at least Whole flatwise coils in one flatwise coil;Alternatively, by part PCB windings in series/parallel connection at least one PCB winding, it is another Part PCB winding parallel/series connection, part flatwise coil series/parallel at least one flatwise coil, another part flatwise coil Parallel/series;Alternatively, by part flatwise coil in part PCB winding at least one PCB winding and at least one flatwise coil Series/parallel together, another part PCB winding and another part flatwise coil parallel/series.
To sum up, on the one hand, since using PCB winding and flatwise coil, as primary/secondary coil, the two is small in size, because This, is capable of the volume of reduced plan transformer on the whole.On the other hand, when the primary/secondary line for needing to design big the number of turns When circle, since flatwise coil 23 is under relatively small volume, it can laterally increase/reduce the number of turns, it therefore, can be relatively Avoid the need for assembly multilayer just/secondary coil, and then reduce kindred effect and parasitic capacitance, and improve power density and reduce Temperature rise.Yet another aspect, user can neatly assemble PCB winding and flat according to series-parallel relationship and rigging position relationship Coil, so as to provide the flat surface transformer under volume and after flexible assembly rapidly.
In some embodiments, series-parallel relationship include at least one PCB winding each PCB winding all go here and there from each other Connection/parallel connection, and, each flatwise coil all series/parallel from each other at least one flatwise coil;Rigging position relationship packet It includes at least one PCB winding each PCB winding and replaces assembly with each flatwise coil at least one flatwise coil.
Referring to Fig. 9, step 83 includes:
Step 831, by each flat wire in PCB winding each at least one PCB winding and at least one flatwise coil Circle alternately assembles;
Whole PCB winding at least one PCB winding of step 832, series/parallel, and, series/parallel at least one Whole flatwise coils in flatwise coil;
Step 833, by the first magnetic core, at least one PCB winding, at least one flatwise coil and the concentric dress of the second magnetic core It is made into the flat surface transformer.
It is surface insulated relatively good due to PCB winding, and PCB winding 22 replaces assembly with flatwise coil 23, Thus the kindred effect for the flat surface transformer that rigging position relationship is constituted is minimum, and performance is relatively good.
In some embodiments, referring to Fig. 10, step 81 includes:
Step 811 determines AC/DC impedance ratio according to temperature increase requirement and current density;
Step 812, according to Dowell curve, table look-up to obtain Q value;
Step 813, according to formula:Fl=NlH/ (h+s), calculates the optimal thickness of flatwise coil;
Step 814 selects flatwise coil of the flatwise coil of optimal thickness as assembly when.
In the present embodiment, NlFor every layer of the number of turns, s is conductor interlayer spacing distance, FlFor layers of copper coefficient, h is flatwise coil Thickness, Δ is penetration depth.
It is big for transformer alternating circuit component, F is selected under normal conditionsR=1.5 is best, is confined to manufacturing process certainly Difficulty and window fill factor, FRValue can also increase, the maximum F that can be chosenRThe temperature rise that value can be born according to the coil Depending on range.FRIt increases, it, if being lower than 1.5, is more than minimum switch-back point that loss, which becomes larger, is needed with thinner thinner conducting wire, window Fill factor is reduced.It is tabled look-up by Dowell curve it is found that for example: working as FR=1.5, when the number of plies is 1, Q is about 1.6;The number of plies is 2 When, Q is about 1.1;When the number of plies is 3, Q value is about 0.8;When the number of plies is 10, Q is about 0.4.
Therefore, the utility model embodiment overcomes kelvin effect and kindred effect bring fuel factor, flat by optimizing The thickness and interlayer spacings size of flat coil, which has optimal AC DC impedance ratio, to substantially increase Window utilization rate.
Further, by calculating the thickness of optimal flatwise coil, kelvin effect can be improved and face side effect band The loss for the current cross section product come considerably increases the power of flat surface transformer so that coil be made to possess maximum current density Volume ratio.
In some embodiments, the number of plies of Alpha's flatwise coil is 2 layers, and the number of turns of every layer of Alpha's flatwise coil is greater than Or it is equal to 2 circles, for example, the number of turns of every layer of Alpha's flatwise coil is 3 circles.
In some embodiments, PCB winding includes M layers of PCB coil, and every layer of PCB coil of M layers of PCB coil can be used as just Grade coil or secondary coil, and in PCB winding, primary coil replace assembly with secondary coil, and M is positive integer, and M >=1.
It should be noted that not necessarily there is centainly successive between above steps in above-mentioned each embodiment Sequentially, those of ordinary skill in the art are appreciated that in different embodiments according to the description of the utility model embodiment, above-mentioned Each step can have the different sequences that executes, and also i.e., it is possible to execute parallel, can also exchange execution etc..
It should be noted that not in flat surface transformer production method embodiment detailed description technical detail, reference can be made to Flat surface transformer provided by the utility model embodiment is related to be illustrated.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations; Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments, Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be Simplicity, they do not provide in details;Although the utility model is described in detail with reference to the foregoing embodiments, this The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, Or equivalent replacement of some of the technical features;And these are modified or replaceed, and do not make the sheet of corresponding technical solution Matter is detached from the range of each embodiment technical solution of the application.

Claims (10)

1. a kind of flat surface transformer, which is characterized in that including the first magnetic core, at least one PCB winding, at least one flatwise coil And second magnetic core, each PCB winding, at least one described flatwise coil in first magnetic core, at least one described PCB winding In each flatwise coil and second magnetic core is concentric is assembled into the flat surface transformer.
2. flat surface transformer according to claim 1, which is characterized in that at least one described PCB winding each PCB around Group replaces assembly with each flatwise coil at least one described flatwise coil.
3. flat surface transformer according to claim 1, which is characterized in that at least one PCB winding described in series/parallel Whole PCB windings.
4. flat surface transformer according to claim 1, which is characterized in that at least one flatwise coil described in series/parallel Middle whole flatwise coil.
5. flat surface transformer according to claim 1, which is characterized in that the flatwise coil includes Alpha's flat wire Circle.
6. flat surface transformer according to claim 1, which is characterized in that the PCB winding is armature winding, described flat Coil is secondary windings;Alternatively, the PCB winding is secondary windings, the flatwise coil is armature winding.
7. flat surface transformer according to any one of claims 1 to 6, which is characterized in that PCB winding includes M layers of PCB line Circle, every layer of PCB coil of the M layers of PCB coil can be used as primary coil or secondary coil, and in the PCB winding, primary Coil replaces assembly with secondary coil, and M is positive integer, and M >=1.
8. flat surface transformer according to any one of claims 1 to 6, which is characterized in that first magnetic core or described Two magnetic cores include pedestal, the first side wall, second sidewall and magnetic core column, and the first side wall is set to pedestal side, and second sidewall is set It is placed in the pedestal other side, the first side wall is opposite with second sidewall, and magnetic core column is set to the middle part of pedestal.
9. flat surface transformer according to claim 8, which is characterized in that
The side of the first side wall towards the magnetic core column is provided with the first groove, and the second sidewall is towards the magnetic core column Side be provided with the second groove;
The PCB winding includes the first protrusion and the second protrusion, and first protrusion is fastened in first groove, and described the Two protrusions are fastened in second groove.
10. a kind of electronic equipment, which is characterized in that including flat surface transformer as described in any one of claim 1 to 9.
CN201820569220.XU 2018-04-19 2018-04-19 A kind of flat surface transformer and electronic equipment Active CN208189370U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108335879A (en) * 2018-04-19 2018-07-27 优尔特电子(深圳)有限公司 A kind of flat surface transformer, electronic equipment and flat surface transformer production method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108335879A (en) * 2018-04-19 2018-07-27 优尔特电子(深圳)有限公司 A kind of flat surface transformer, electronic equipment and flat surface transformer production method
CN108335879B (en) * 2018-04-19 2020-04-14 优尔特电子(深圳)有限公司 Planar transformer, electronic equipment and manufacturing method of planar transformer

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