CN207082424U - Board-like transformer and adapter and charger with the transformer - Google Patents

Board-like transformer and adapter and charger with the transformer Download PDF

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Publication number
CN207082424U
CN207082424U CN201720473735.5U CN201720473735U CN207082424U CN 207082424 U CN207082424 U CN 207082424U CN 201720473735 U CN201720473735 U CN 201720473735U CN 207082424 U CN207082424 U CN 207082424U
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pcb board
layer
coil
board
transformer
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CN201720473735.5U
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Inventor
刘昊
郭修根
肖德湖
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Austrian Sea Polytron Technologies Inc Dongguan
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Austrian Sea Polytron Technologies Inc Dongguan
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Abstract

A kind of small volume, cost are low, efficiency high and meet the board-like transformer of national standard GB4943 requirements and adapter and charger with the transformer.Board-like transformer is made up of the primary coil, secondary coil and feedback coil being separately positioned on different pcb boards, all pcb boards are stacked up and down, sealed, secondary coil, laid at least on top layer pcb board and bottom pcb board using triple insulated wire using insulating cement between adjacent two layers pcb board;Primary coil, multi-turn copper foil wire is etched on the multi-layer PCB board under top layer pcb board;Feedback coil, multi-turn copper foil wire is etched at least one layer of pcb board under primary coil;A medium pore for being less than the internal coil diameter on corresponding pcb board around corresponding pcb board geometric center and internal diameter is opened up on all pcb boards, the center pillar of E-type magnetic core is placed through in the medium pore.Its small volume, cost are low, production efficiency is high, anti-EMI filter and common mode disturbances ability are strong.

Description

Board-like transformer and adapter and charger with the transformer
Technical field
It the utility model is related to a kind of suitable for low-power power adapter and the transformer of charger, more particularly to one kind Board-like stacking transformer without traditional skeleton.
Background technology
Due to expectation more and more higher of the vigorous and people to electronic product of demand, the miniaturization multifunction of electronic product Paid attention to by more businessmans, equally, to low-power power adapter and the small form factor requirements of charger volume also more and more higher.
In the prior art, the emphasis of research staff is placed on how to reduce adapter and the charger internal electronic component more Size on, up to the present, the Research idea produces effects bad.And the volume for influenceing low-power power adapter and charger is big Small, it is small that most important factor is that transformer therein can not be done, and existing transformer is accounted for by skeleton, magnetic core, line bag composition, line bag According to a big chunk of whole volume of transformer, if without using line bag, whole volume can greatly reduce, and transformer can also It is made thinner, whole charger volume can obtain smaller.
Utility model content
The technical problems to be solved in the utility model is to provide low a kind of small volume, cost, efficiency high and meets national standard The board-like transformer of GB4943 requirements and adapter and charger with the transformer.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is:
Board-like transformer of the present utility model, its by be separately positioned on different pcb boards primary coil, secondary coil and Feedback coil is formed, and all pcb boards are stacked up and down, is sealed between adjacent two layers pcb board using insulating cement, wherein,
Secondary coil, using triple insulated wire respectively on top layer pcb board and bottom pcb board around the several of corresponding PCB plates What center lays at least three circle coilings and forms top layer secondary coil and bottom secondary coil, and top layer secondary coil and bottom is secondary Coil is in parallel using fly line and draws head end and tail end;
Primary coil, respectively around the geometric center etching of corresponding pcb board on the multi-layer PCB board under top layer pcb board Go out at least five circle copper foil wires, the tail end of the copper foil wire in last layer is by the conductive through hole that is arranged on the PCB plates with The head end of copper foil wire in one layer is connected, and the rest may be inferred gets up the copper foil wired in series on multi-layer PCB board to form that this is first The tail of level coil, the head end of the copper foil wire in primary coil on first layer pcb board and the copper foil wire on last layer of pcb board Drawn by wire at end;
Feedback coil, the geometric center at least one layer of pcb board under primary coil around the pcb board etch at least Six circle copper foil wires, the head end of the copper foil wire and tail end are drawn by conductive connecting line;
One is opened up on all pcb boards around corresponding pcb board geometric center and internal diameter is less than the coil on corresponding pcb board The medium pore of internal diameter, the center pillar of E-type magnetic core is placed through in the medium pore;
Safe distance between the primary coil and secondary coil is more than 6.4mm.
The number of plies of pcb board shared by the primary coil is six layers.
One layer resistant to common code interference first is additionally provided between the first layer pcb board and top layer pcb board of the primary coil Screen layer, one layer of secondary shielding resistant to common code interference also is provided between the pcb board where the feedback coil and bottom pcb board Layer;Geometric center respectively around the pcb board in first screen layer and secondary shielding layer etches at least five circle copper foil wires, The head end of corresponding copper foil wire is drawn using pin by the conductive through hole being opened on corresponding pcb board.
One layer of anti-electricity is additionally provided between the pcb board where first screen layer and the first layer pcb board of the primary coil The whole shielding layer of magnetic disturbance, this layer are provided with the copper foil for covering the pcb board all surfaces.
The line footpath of described triple insulated wire is Ф 0.55.
The primary coil, feedback coil and the coiling on pcb board where secondary coil or the shape of copper foil wire (31) For ring, rectangular loop or ellipse circle.
The width of the copper foil wire is in 0.4-0.6mm.
Adapter of the present utility model suitable for small-power power, wherein DC voltage after rectification is converted into 5V- Transformer used in 20V DC voltages is the board-like transformer of the present utility model.
Charger of the present utility model suitable for small-power power, wherein DC voltage after rectification is converted into 5V- Transformer used in 20V DC voltages is the board-like transformer of the present utility model.
Compared with prior art, if the utility model use by dried layer pcb board 7 as carrying primary coil, secondary coil, Feedback coil and the supporter of anti-common-mode signal interference so that it has the following advantages that.First, EMI and common mode disturbances are small, pass System by winding tension, line footpath, the influence of automation equipment or artificial coiling etc., can cause to be distributed different knot electricity around line transformer Hold, the interference signal uniformity of EMI and common mode disturbances is poor, is difficult to control, structure of the present utility model, due to not using enamel-covered wire Coiling, junction capacity is smaller between the copper foil wire on adjacent pcb board 7, and therefore, its common mode disturbances being subject to and EMI interference are small In tradition around line transformer.Second, transformer temperature is low, the width that can be designed due to the width of the copper foil wire on each pcb board 7 A bit, corresponding area of dissipation also increases, and is not in the problem of transformer wire bag temperature is too high.Third, production efficiency improves, this The transformer of utility model eliminates original wire winding, is directly formed with multi-layer PCB board 7, and magnetic core uses quick assembled type, Therefore, its production efficiency is much larger than the production efficiency of traditional transformer.Volume of the present utility model can be made small, to charging Larger contribution is made in the miniaturization of device.
Brief description of the drawings
Fig. 1 is board-like transformer appearance schematic diagram of the present utility model.
Fig. 2 is Fig. 1 exploded perspective view.
Fig. 3 is the circuit theory diagrams by board-like transformer application of the present utility model in adapter and charger.
Reference is as follows:
Primary coil 1, feedback coil 11, top layer secondary coil 21, bottom secondary coil 22, copper foil wire 31, it is triple absolutely Edge line 32, fly line 33, head end 41, tail end 42, first screen layer 51, secondary shielding layer 52, whole shielding layer 6, pcb board 7, top layer Pcb board 71, bottom pcb board 72, medium pore 73, magnetic core 8, board-like transformer 9.
Embodiment
Board-like transformer of the present utility model is applied to low-power power adapter and charger, is incited somebody to action after being mainly used in rectification Higher DC voltage is changed into low-voltage dc voltage, such as direct current 5-20V.
The board-like transformer is made up of primary coil 1, secondary coil and feedback coil 11, on circuit, primary coil 1 Identical side is placed in feedback coil 11, and secondary coil is placed in opposite side.
As shown in Figure 1, 2, primary coil 1, secondary coil and feedback coil 11 are respectively and are wound on plane pcb board 7 More turn coils, medium pore 73 is offered on every pcb board 7, be provided with the medium pore 73 through primary coil 1, secondary coil With the cylindrical magnetic core 8 of feedback coil 11.
The more turn coils being arranged on monolithic pcb board 7 are that continuous coiling (is noted in the same plane:See in Fig. 2 More turn coils on each pcb board are intended to mean that turns to cast using copper foil or triple insulated wire, so shown on monolithic pcb board Coil be not drawn as continuously), the input pin of every class coil (also referred to as head end 41) and output pin (being also referred to as tail end 42) tap are drawn Go out, some pieces of pcb boards 7 stack together again afterwards, be tightly connected between adjacent two layers pcb board 7 using insulating cement, its is specific Structure difference is as follows:
1st, secondary coil, respectively it is located at the bottom on top layer secondary coil 21 and bottom pcb board 72 on top layer pcb board 71 Hierarchical level coil 22.
1) top layer secondary coil 21
Using triple insulated wire 32, (also can be on the lower surface) surround corresponding center on the upper surface of top layer pcb board 71 At least coiling three of hole 73 is enclosed and fixed, the coil pattern of coiling, can be circular, rectangle or ellipse.The utility model is selected The specification of triple insulated wire 32 be Ф 0.55, the concrete shape of coil pattern, the thickness of triple insulated wire 32, two adjacent rings it Between gap and coiling direction by it is designed or need inductance values and the secondary coil output current direction depending on.Afterwards, The end pin of the coil is drawn again, will the head end 41 of the triple insulated wire 32 draw " A " pin as secondary coil in Fig. 3, Tail end 42 draws " B " pin as secondary coil in Fig. 3.
2) bottom secondary coil 22
Similarly, as stated above on the upper surface of bottom pcb board 72 around the coiling of medium pore 73 thereon and top layer PCB Coil shape, size identical coil on plate 71 simultaneously draw the end pin of the coil.
3) by the head end 41 of two coils on top layer pcb board 71 and bottom pcb board 72 and connect using electrical connection fly line 33 Together, equally the tail end 42 of two coils is connected together, thus, forms secondary coil of the present utility model.
Annotation:
Triple insulated wire 32 (also referred to as three layer insulation wire), it is a kind of High Performance Insulation wire, and this wire has three absolutely Edge layer, centre are cored wires, and first layer is that its thickness is several microns, can but bear 3KV pulse in golden yellow polyamine film High pressure, the second layer is varnished for high-insulativity, and third layer is transparent glass layer, and the gross thickness of insulating barrier is only 20-100um, its advantage are dielectric strength height, can bear to exchange 3000V safe voltage, current density between any two layers Greatly.
Described in the utility model " fly line 33 " refers to that winding displacement due to being limited by space, causes connect two Separate empty setting, therefore, two parts are weldingly connected by the thinner enamel-covered wire of use with flatiron every sky.
2nd, primary coil 1, the medium pore 73 in respective panels respectively on the multi-layer PCB board 7 under top layer pcb board 71 Etch at least five circle copper foil wires 31, the tail end 42 of the copper foil wire 31 in last layer is by being arranged on leading on the pcb board 7 Electric through-hole is connected with the head end 41 of the copper foil wire 31 in next layer, and the rest may be inferred by the copper foil wire 31 on multi-layer PCB board 7 It is together in series and forms the primary coil 1.In the primary coil 1 on first layer pcb board 7 head end 41 of copper foil wire 31 and last The tail end 42 of copper foil wire 31 is drawn by wire on layer pcb board 7.
The number of plies of pcb board 7 is preferably six layers shared by primary coil 1 of the present utility model, by the head end of the primary coil 1 41 draw " 1 " pin as primary coil in Fig. 31, and its tail end 42 draws " 2 " pin as primary coil in Fig. 31.
3rd, feedback coil 11, the quarter of medium pore 73 on one layer of pcb board 7 under primary coil 1 on the pcb board 7 Lose at least six circle copper foil wires 31, drawn the head end 41 of the copper foil wire 31 and tail end 42 by conductive connecting line.
The head end 41 and tail end 42 of the feedback coil 11 are drawn with the head end 41 and tail end 42 of primary coil 1 by homonymy, its Head end 41 is drawn draws as " 4 " pin in Fig. 3 as " 3 " pin in Fig. 3, tail end 42.
4th, in order to prevent interference of the common mode voltage signal to the transformer, in the first layer pcb board 7 of the primary coil 1 Between the top layer pcb board 71 of secondary coil on one layer of pcb board 7, provided with one layer of first screen layer 51 resistant to common code interference, in institute State on one layer of pcb board 7 between the pcb board 7 at the place of feedback coil 11 and the bottom PCB plates 72 of secondary coil, provided with another layer Secondary shielding layer 52 resistant to common code interference.
Medium pore 73 of the first screen layer 51 with secondary shielding layer 52 respectively on corresponding pcb board 7 etches At least five circle copper foil wires 31, equally, will corresponding copper foil wire using pin by the conductive through hole being opened on the pcb board 7 31 head end 41 is drawn.The head end 41 is connected to " 4 " pin in Fig. 3 after drawing, tail end 42 is hanging.
5th, in order to prevent interference of other electromagnetic signals to the transformer, the pcb board 7 where the first screen layer 51 On one layer of pcb board 7 between the first layer pcb board 7 of the primary coil 1, the whole shielding layer provided with one layer of electromagnetism interference 6, the whole shielding layer 6 is at least one surface of the pcb board 7 at the place of whole shielding layer 6 (i.e. on front and/or the back side) On by copper foil all cover.
The first screen layer 51, secondary shielding layer 52 and whole shielding layer 6 are main to play limitation between primary and secondary The effect of electromagnetic interference and common-mode voltage, due to being operated in high-frequency work state, coupled between primary and secondary and produce larger voltage And current spike, the Current Voltage spike of high frequency can bring common mode disturbances and electromagnetic interference, to suppress to be produced by off state Interference, first screen layer 51 isolates caused interference between top layer secondary coil 21 and primary coil 1, secondary shielding layer 52 Isolate caused interference between bottom secondary coil 22 and primary coil 1, by adjusting first screen layer 51, secondary shielding layer 52 The number of turns can adjust stiffness of coupling between primary coil 1 and secondary coil, reduce common mode disturbances amplitude and drop so as to play The effect of low EMI.Whole shielding layer 6 is to strengthen limiting top layer secondary coil 21 and primary coil 1 using PCB copper foils Between caused electromagnetic interference.
The width of above-mentioned copper foil wire 31 is depending on the overall dimension of the transformer and power output, the utility model Preferably 0.4-0.6mm.
Board-like transformer of the present utility model is formed after each coil and screen layer of said structure are fixed together.This The magnetic core 8 in utility model is double E-type magnetic cores 8, or E+I types magnetic core 8, model EED17.6, to improve efficiency With reduction EMC, comprehensive consideration, primary electrical sensibility reciprocal is designed as 0.6mH.
Board-like transformer of the present utility model, power supply PCB primary side is connected to by using triple insulated wire 32, made first Level distance is more than 6.4mm (being separated by between primary and secondary by first screen layer 51, secondary shielding layer 52, whole shielding layer 6), can make just Secondary security distance meets national standard GB4943 requirements.Using the adapter of board-like transformer of the present utility model and putting down for charger Equal energy conversion efficiency reaches 81%, meets the standard of six grades of standards 79% of COC, DOE efficiency.
Board-like transformer 9 of the present utility model, its circuit theory are installed in adapter and charger of the present utility model Figure such as Fig. 3.
Fig. 3 is the circuit theory diagrams using the board-like transformer of the utility model:
By exchanging 100-240V inputs, resistance is insured by F1, and DC voltage is obtained by BD1 bridge rectifiers, and Electromagnetism interference (abbreviation EMI) filtering is carried out by electric capacity C1, electric capacity C2, inductance L1, inductance L2, it is then new by this practicality The board-like transformer of type realizes that power is changed, and finally by electric capacity C7, electric capacity C8 and rectifying tube D4 secondary rectification, filtering, obtains Exported to smoother direct current 5V to mobile phone or miscellaneous equipment charging.
Wherein comprising single-chip microcomputer U1 by controlling Q1 (metal-oxide-semiconductor) primary energy is delivered to secondary, and it is anti-by transformer " 2 " pin that feedback winding and R13, R12 are connected to single-chip microcomputer U1 monitors output voltage at any time, so as to adjust output voltage, makes its beginning Ensure 5V outputs eventually.Diode D3, resistance R14 and electric capacity C4 provide operating voltage for U1, and resistance R1, resistance R2 pass through connection High pressure, and provided after being depressured to single-chip microcomputer U1 and start voltage.Resistance R3, electric capacity C3, resistance R4 and diode D1 can reduce just Due to voltage spikes caused by secondary leakage inductance.

Claims (9)

  1. A kind of 1. board-like transformer, it is characterised in that:It is by the primary coil (1), secondary that is separately positioned on different pcb boards (7) Level coil and feedback coil (11) are formed, and all pcb boards (7) are stacked up and down, and insulating cement is used between adjacent two layers pcb board (7) Sealing, wherein,
    Secondary coil, using triple insulated wire (32) respectively on top layer pcb board (71) and bottom pcb board (72) around corresponding The geometric center of pcb board (7) lays at least three circle coilings and forms top layer secondary coil and bottom secondary coil (22), by top layer Level coil and bottom secondary coil (22) using fly line (33) parallel connection and draw head end (41) and tail end (42);
    Primary coil (1), respectively around the geometry of corresponding pcb board (7) on the multi-layer PCB board (7) under top layer pcb board (71) Center etches at least five circle copper foil wires (31), and the tail end (42) of the copper foil wire (31) in last layer is by being arranged on this Conductive through hole on pcb board (7) is connected with the head end (41) of the copper foil wire (31) in next layer, and the rest may be inferred by multilayer Copper foil wire (31) on pcb board (7), which is together in series, forms the primary coil (1), first layer pcb board (7) in primary coil (1) On copper foil wire (31) head end (41) and the copper foil wire (31) on last layer of pcb board (7) tail end (42) by leading Line is drawn;
    Feedback coil (11), around the geometric center of the pcb board (7) at least one layer of pcb board (7) under primary coil (1) At least six circle copper foil wires (31) are etched, are drawn the head end (41) of the copper foil wire (31) and tail end (42) by conductive connecting line Go out;
    One is opened up on all pcb boards (7) around corresponding pcb board (7) geometric center and internal diameter to be less than on corresponding pcb board (7) Internal coil diameter medium pore (73), the center pillar of E-type magnetic core (8) is placed through in the medium pore (73);
    Safe distance between the primary coil and secondary coil is more than 6.4mm.
  2. 2. board-like transformer according to claim 1, it is characterised in that:Pcb board (7) shared by the primary coil (1) The number of plies is six layers.
  3. 3. board-like transformer according to claim 1, it is characterised in that:In the first layer pcb board of the primary coil (1) (7) one layer of first screen layer (51) resistant to common code interference is additionally provided between top layer pcb board (71), in the feedback coil (11) One layer of secondary shielding layer (52) resistant to common code interference also is provided between the pcb board (7) and bottom pcb board (72) at place;First Screen layer (51) with secondary shielding layer (52) respectively around the pcb board (7) geometric center etch at least five circle copper foils lead Line (31), the head end (41) that will correspond to copper foil wire (31) by the conductive through hole being opened on corresponding pcb board (7) use pin Pin is drawn.
  4. 4. board-like transformer according to claim 3, it is characterised in that:In the pcb board (7) where first screen layer (51) The whole shielding layer (6) of one layer of electromagnetism interference is additionally provided between the first layer pcb board (7) of the primary coil (1), described Whole shielding layer (6) is provided with the copper foil for covering pcb board (7) all surfaces.
  5. 5. board-like transformer according to claim 1, it is characterised in that:The line footpath of described triple insulated wire (32) is Ф 0.55。
  6. 6. board-like transformer according to claim 1, it is characterised in that:The primary coil (1), feedback coil (11) and Be shaped as ring, rectangular loop or the ellipse of coiling or copper foil wire (31) where secondary coil on pcb board (7) enclose.
  7. 7. the board-like transformer according to claim 1 or 3, it is characterised in that:The width of the copper foil wire (31) exists 0.4-0.6mm。
  8. A kind of 8. adapter suitable for small-power power, it is characterised in that:DC voltage after rectification is wherein converted into 5V- Board-like transformer (9) of the transformer any one of claim 1-7 used in 20V DC voltages.
  9. A kind of 9. charger suitable for small-power power, it is characterised in that:DC voltage after rectification is wherein converted into 5V- Board-like transformer (9) of the transformer any one of claim 1-7 used in 20V DC voltages.
CN201720473735.5U 2017-04-28 2017-04-28 Board-like transformer and adapter and charger with the transformer Active CN207082424U (en)

Priority Applications (1)

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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
CN111145987A (en) * 2018-11-02 2020-05-12 台达电子企业管理(上海)有限公司 Transformer module and power module
US10847297B1 (en) 2019-10-16 2020-11-24 Hong Kong Applied Science and Technology Research Institute Company, Limited Low-core-loss transformer with magnetic pillar in center of four corner pillars
WO2021088299A1 (en) * 2019-11-08 2021-05-14 深圳市航嘉驰源电气股份有限公司 Planar transformer, circuit board having same and power converter
US11133750B2 (en) 2018-11-02 2021-09-28 Delta Electronics (Shanghai) Co., Ltd. Power module

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111145987A (en) * 2018-11-02 2020-05-12 台达电子企业管理(上海)有限公司 Transformer module and power module
CN111145987B (en) * 2018-11-02 2021-07-06 台达电子企业管理(上海)有限公司 Transformer module and power module
US11133750B2 (en) 2018-11-02 2021-09-28 Delta Electronics (Shanghai) Co., Ltd. Power module
US10847297B1 (en) 2019-10-16 2020-11-24 Hong Kong Applied Science and Technology Research Institute Company, Limited Low-core-loss transformer with magnetic pillar in center of four corner pillars
WO2021072790A1 (en) * 2019-10-16 2021-04-22 Hong Kong Applied Science and Technology Research Institute Company Limited Low-core-loss transformer with magnetic pillar in center of four corner pillars
WO2021088299A1 (en) * 2019-11-08 2021-05-14 深圳市航嘉驰源电气股份有限公司 Planar transformer, circuit board having same and power converter

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