CN206421898U - PCB flat-plate transformers with tap - Google Patents

PCB flat-plate transformers with tap Download PDF

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Publication number
CN206421898U
CN206421898U CN201720047406.4U CN201720047406U CN206421898U CN 206421898 U CN206421898 U CN 206421898U CN 201720047406 U CN201720047406 U CN 201720047406U CN 206421898 U CN206421898 U CN 206421898U
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layers
tap
winding layers
magnetic core
primary winding
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CN201720047406.4U
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甘宜洋
徐海
承杰
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Koboda Technology Ltd By Share Ltd
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Koboda Technology Ltd By Share Ltd
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Abstract

The utility model discloses a kind of PCB flat-plate transformers with tap, including magnetic core, armature winding, secondary windings and the pcb board with sandwich construction;Pcb board with sandwich construction includes multilayer primary winding layers and multilayer secondary winding layers, and primary winding layers are provided with primary winding coil, and secondary winding layers are provided with secondary winding coil;Primary winding coil of the armature winding on multilayer primary winding layers is constituted, and secondary winding coil of the secondary windings in multilayer secondary winding layers is constituted;There is the pcb board of sandwich construction to be provided with multiple vias for this;Wherein, multilayer secondary winding layers stack together, and the multilayer secondary winding layers are stacked in the top of a portion primary winding layers, and remaining primary winding layers is stacked in the top of the multilayer secondary winding layers;Armature winding or secondary windings are provided with tap.The utility model can provide different boost voltages when circuit works, and simple in construction, and thermal diffusivity is good, be suitably applied in high frequency switch power product.

Description

PCB flat-plate transformers with tap
Technical field
The utility model is related to PCB flat-plate transformers.
Background technology
Current Switching Power Supply development trend is miniaturization, lightness, multifunction, and its main implementation method is to improve power Density and the component using miniaturization.Because PCB plane transformer can reduce the loss of winding kelvin effect and kindred effect, And the size of the parasitic parameters such as leakage inductance is can control, so its use in Switching Power Supply design is more and more extensive.At present, PCB flat-plate transformers mainly have two kinds of structure types frequently with EE or EI magnetic cores, the winding of transformer:1 armature winding and 1 Secondary windings, 1 armature winding and n secondary windings.Existing PCB flat-plate transformers are primarily present problems with:
1st, existing flat-plate transformer winding realizes that multiple voltage transformations will increase multiple secondary windings without tap, right The requirement of magnetic core is increased, and design cost is high, and electromagnetic interference is big;
2nd, function is single, can not extensive use in some complicated electronic products.
The content of the invention
Technical problem to be solved in the utility model is to provide a kind of PCB with tap suitable for Switching Power Supply Flat-plate transformer, it can provide different boost voltages when circuit works, and simple in construction, and thermal diffusivity is good, be adapted in high frequency, greatly Worked under the operating mode of electric current.
In order to solve the above technical problems, the utility model embodiment provides a kind of PCB flat-plate transformers with tap, bag Include magnetic core, armature winding, secondary windings and the pcb board with sandwich construction;At the beginning of pcb board with sandwich construction includes multilayer Level winding layers and multilayer secondary winding layers, primary winding layers are provided with primary winding coil, and secondary winding layers are provided with secondary windings line Circle;Primary winding coil of the armature winding on multilayer primary winding layers is constituted, and secondary windings is in multilayer secondary winding layers Secondary winding coil is constituted;There is the pcb board of sandwich construction to be provided with multiple vias for this;Wherein, multilayer secondary winding layers are stacked in Together, and the multilayer secondary winding layers are stacked in the top of a portion primary winding layers, remaining primary winding layers is stacked In the top of the multilayer secondary winding layers;Armature winding or secondary windings are provided with tap.
The utility model is at least up to one of following beneficial effect:
1st, can be from armature winding or secondary windings according to the PCB flat-plate transformers with tap of the utility model embodiment Upper extraction tap, in addition to carrying out armature winding and the conversion of secondary windings energy, can also produce different boost voltages, to electricity Other circuit modules of sub- product are powered;
2nd, in the PCB flat-plate transformers with tap of the utility model embodiment, multilayer primary winding layers are distinguished Be placed in top plate and the bottom of pcb board, PCB flat-plate transformers can be made preferably to be radiated, be also effectively reduced leakage inductance and Kindred effect etc. influences, and facilitates tap to realize electrical connection with outside power module by via.When the PCB flat boards become Depressor is applied in DC/DC high-frequency converters, can reduce power consumption and the temperature rise of related power device, improves the work effect of product Rate.
Brief description of the drawings
Fig. 1 shows the structural representation of the PCB flat-plate transformers with tap according to the embodiment of the utility model one.
Fig. 2 is shown to exist according to the PCB flat-plate transformers with tap of the embodiment of the utility model one in tap setting Circuit theory diagrams during armature winding.
Fig. 3 is shown to exist according to the PCB flat-plate transformers with tap of the embodiment of the utility model one in tap setting Circuit theory diagrams during secondary windings.
Fig. 4 shows the schematic diagram of the via according to the embodiment of the utility model one.
Embodiment
The utility model is made below in conjunction with the accompanying drawings and being further illustrated.
Fig. 1 is referred to Fig. 3.According to the PCB flat-plate transformers with tap of the embodiment of the utility model one, including magnetic Core, armature winding P, secondary windings S and the pcb board 2 with sandwich construction.
Magnetic core runs through pcb board 2.In the embodiment shown in fig. 1, magnetic core is made up of two E shape magnetic cores, one of E shapes Open Side Down for magnetic core 11, and another opening upwards of E shapes magnetic core 12, two E shape magnetic cores are mutually butted, and being formed has closed magnetic The magnetic core on road.When high temperature rise is applied, two E shapes magnetic cores are mutually butted using the fixed form with clip slot, and in temperature rise not High application scenario, two E shapes magnetic cores can be mutually bonded using resin.In other embodiments, magnetic core is by an E shape magnetic Core and an I shapes magnetic core composition, the opening of the E shapes magnetic core are mutually butted towards I shape magnetic cores, and E shapes magnetic core with I shape magnetic cores.
Pcb board 2 with sandwich construction includes multilayer primary winding layers 21 and multilayer secondary winding layers 22.Wherein, multilayer Secondary winding layers 22 stack together, and the multilayer secondary winding layers 22 are stacked in the upper of a portion primary winding layers 21 Side, remaining primary winding layers 21 are stacked in the top of the multilayer secondary winding layers 22.In Fig. 1 in shown example, pcb board 2 have two layers of primary winding layers 21 and two layers of secondary winding layers 22, and two layers of primary winding layers 21 is located at the top layer of pcb board 2 respectively And bottom, two layers of secondary winding layers 22 is between two layers of primary winding layers 21.
Primary winding layers 21 are provided with primary winding coil 211, and secondary winding layers 22 are provided with secondary winding coil 221, each Secondary winding coil 221 in the quantity and each secondary winding layers 22 of primary winding coil 211 on primary winding layers 21 Quantity could be arranged to a circle or multiturn according to the requirement of practical application.Armature winding P is first on multilayer primary winding layers 21 Level winding coil 211 is constituted, and secondary winding coils 221 of the secondary windings S in multilayer secondary winding layers 22 is constituted.Preferably, The folding of secondary winding coil 221 or the mode of cabling are identical with primary winding coil 211.In the present embodiment, armature winding P It is made up of N circles primary winding coil 211, secondary windings S is made up of M circles secondary winding coil 221.The He of primary winding coil 211 Secondary winding coil 221 is constituted by insulating medium layer and copper clad layers, and copper clad layers are arranged on the upper surface of insulating medium layer.
In order to provide different boost voltages when circuit works, armature winding P or secondary windings S are provided with tap.According to The PCB flat-plate transformers with tap of the utility model embodiment can be applicable in the DC/DC high-frequency converters of Switching Power Supply, According to different DC/DC changing patteries, lead-out mode and the position of tap are neatly selected.In the figure 2 example, from transformer Armature winding P drawn n tap, wherein n<N, when transformer application is in inverse-excitation converting, and switching tube ends, can become The armature winding P of depressor obtains n different boost voltages, supplies other circuit modules.In the example of fig. 3, from transformer Secondary windings S drawn m tap, wherein m<M, can be secondary when transformer application is in forward conversion, and switching tube is turned on Level winding S obtains m different boost voltage, supplies other circuit modules.In the example of fig. 1, m=1, is time from transformer A tap S3 has been drawn in level winding S.
Pcb board with sandwich construction is provided with multiple vias 23.Positioned at the primary winding coil of different primary winding layers 21 211 are interconnected to an entirety by some of vias, and the secondary winding coil 22 positioned at different secondary winding layers 22 leads to Cross wherein other vias and be interconnected to an entirety, it is for realizing and the terminal of armature winding, secondary to also have some vias The terminal of level winding and tap and the electrical connection of external power source module.Figure 1 illustrates armature winding P terminals P 2, Secondary windings S terminal S2 and secondary windings S tap S3.The dotted line X of vertical extension shown in Fig. 1 is each via Center line.In actual design, the position of via appears in head end or the end of whole circle coil, therefore, wants to obtain auxiliary electricity Pressure, it is only necessary to calculate turn ratio, then finds and suitably crosses hole site.In the present embodiment, in multiple vias 23 wherein A part of via is through hole, and remaining via is blind hole.
It should be noted that tap S3 lead-out mode be not limited to shown in Fig. 1 by way of via is drawn. If for example, the circuit module being connected with tap S3 is located in same secondary winding layers 22 with tap just, will need not take out Head S3 is drawn out to the top layer of pcb board 2 by via, it is only necessary to which being joined directly together the two by wire just can be with.Again such as, if Primary winding layers 21 positioned at the top layer of pcb board 2 have multiturn primary winding coil 211, and calculating determination by voltage ratio draws The position for going out tap is located therein the end of a certain circle coil, then also only need to be directly connected to the end of the circle coil with wire Just can be with, it is not required that electrical connection is realized by via.
For the PCB flat-plate transformers for Switching Power Supply, in flyback or forward-excitation boosting circuit, flow through it is primary around The electric current of group can be bigger than flowing through the electric current of secondary windings, and in order to bear high current, the width of primary winding coil is also greater than secondary The width of winding coil.In the PCB flat-plate transformers with tap of the utility model embodiment, by multilayer primary winding layers Top plate and the bottom of pcb board 2 are respectively placed in, PCB flat-plate transformers can be made preferably to be radiated, electric leakage is also effectively reduced Sense and the influence such as kindred effect, and facilitate tap to pass through via and realize with outside power module to be electrically connected.
PCB flat-plate transformers in the DC/DC high-frequency converters of Switching Power Supply must also consider posting for via generation Raw parameter, such as stray inductance and parasitic capacitance, therefore, via size selection are particularly important.Fig. 4 shows the signal of via Figure.Via is made up of 3 parts:Hole 231, pad area 232 and welding resistance area 233.To obtain accurate voltage, to consider using conjunction Suitable bore dia, pad area diameter and welding resistance area diameter, to reduce impedance, while also to take into account the real-time of voltage signal. In the present embodiment, PCB flat-plate transformers are the high frequency transformer that working frequency is more than or equal to 400KHz;The aperture D0 of each via is 0.15mm~0.25mm, the diameter D1 of the pad area of each via is 0.41mm~0.51mm, the diameter D2 in the welding resistance area of each via For 0.81mm~0.91mm, so as to reduce parasitic parameter influence, the stability and precision of output voltage are improved.
Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model New spirit and scope.So, if these modifications and variations of the present utility model belong to the utility model claim and Within the scope of its equivalent technologies, then the utility model is also intended to comprising including these changes and modification.

Claims (7)

1. a kind of PCB flat-plate transformers with tap, including magnetic core, armature winding, secondary windings and with sandwich construction Pcb board;The described pcb board with sandwich construction includes multilayer primary winding layers and multilayer secondary winding layers, the primary Winding layers are provided with primary winding coil, and the secondary winding layers are provided with secondary winding coil;The armature winding is by the multilayer Primary winding coil composition on primary winding layers, secondary windings line of the secondary windings in the multilayer secondary winding layers Circle composition;The described pcb board with sandwich construction is provided with multiple vias;Characterized in that, the multilayer secondary winding layers are folded Put together, and the multilayer secondary winding layers are stacked in the top of a portion primary winding layers, remaining primary winding layers It is stacked in the top of the multilayer secondary winding layers;
The armature winding or secondary windings are provided with tap.
2. the PCB flat-plate transformers of tap are carried as claimed in claim 1, it is characterised in that the number of the primary winding layers Measure as two layers.
3. the PCB flat-plate transformers of tap are carried as claimed in claim 2, it is characterised in that the number of the secondary winding layers Measure as two layers.
4. the PCB flat-plate transformers with tap as described in claim 1 or 3, it is characterised in that described PCB flat boards become Depressor is the high frequency transformer that working frequency is more than or equal to 400KHz;
The aperture of each via is 0.15mm~0.25mm, a diameter of 0.41mm of the pad area of each via~ 0.51mm, a diameter of 0.81mm~0.91mm in the welding resistance area of each via.
5. the PCB flat-plate transformers of tap are carried as claimed in claim 1, it is characterised in that the magnetic core is by two E shape magnetic Core is constituted, and Open Side Down for one of E shapes magnetic core, and another E shape magnetic core opening upwards, two E shape magnetic cores are mutually butted.
6. the PCB flat-plate transformers of tap are carried as claimed in claim 1, it is characterised in that the magnetic core is by an E shape magnetic Core and an I shapes magnetic core composition, the opening of the E shapes magnetic core is towards the I shapes magnetic core, and E shapes magnetic core and I shapes magnetic core are mutually right Connect.
7. as claimed in claim 1 carry tap PCB flat-plate transformers, it is characterised in that the primary winding coil and The secondary winding coil is constituted by insulating medium layer and copper clad layers, and the copper clad layers are arranged on the upper table of insulating medium layer Face.
CN201720047406.4U 2017-01-16 2017-01-16 PCB flat-plate transformers with tap Active CN206421898U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108010711A (en) * 2017-12-26 2018-05-08 电子科技大学 A kind of process of 3D printing PCB plane transformer
CN110556239A (en) * 2018-06-01 2019-12-10 株式会社田村制作所 Electronic component
CN111091956A (en) * 2019-12-27 2020-05-01 广州金升阳科技有限公司 Current transformer and manufacturing method thereof
WO2023025674A1 (en) * 2021-08-26 2023-03-02 Magna powertrain gmbh & co kg Planar transformer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108010711A (en) * 2017-12-26 2018-05-08 电子科技大学 A kind of process of 3D printing PCB plane transformer
CN110556239A (en) * 2018-06-01 2019-12-10 株式会社田村制作所 Electronic component
CN110556239B (en) * 2018-06-01 2023-11-07 株式会社田村制作所 Electronic component
CN111091956A (en) * 2019-12-27 2020-05-01 广州金升阳科技有限公司 Current transformer and manufacturing method thereof
CN111091956B (en) * 2019-12-27 2021-02-23 广州金升阳科技有限公司 Current transformer and manufacturing method thereof
WO2023025674A1 (en) * 2021-08-26 2023-03-02 Magna powertrain gmbh & co kg Planar transformer

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