CN105634265B - Supply unit and its flat surface transformer - Google Patents

Supply unit and its flat surface transformer Download PDF

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Publication number
CN105634265B
CN105634265B CN201610165108.5A CN201610165108A CN105634265B CN 105634265 B CN105634265 B CN 105634265B CN 201610165108 A CN201610165108 A CN 201610165108A CN 105634265 B CN105634265 B CN 105634265B
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CN
China
Prior art keywords
transformer
flat
circuit board
inductance coil
magnetic core
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CN201610165108.5A
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Chinese (zh)
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CN105634265A (en
Inventor
谢春华
刘建飞
蔡广金
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SHENZHEN JINGQUANHUA ELECTRONICS CO LTD
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SHENZHEN JINGQUANHUA ELECTRONICS CO LTD
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Publication of CN105634265A publication Critical patent/CN105634265A/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/44Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/33Arrangements for noise damping

Abstract

The present invention provides a kind of supply unit and its flat surface transformer, the flat surface transformer includes a magnetic core group and a transformer circuit board, the magnetic core group has the upper magnetic core being oppositely arranged and lower magnetic core, the transformer circuit board is arranged between the upper magnetic core and lower magnetic core, and the transformer circuit board is provided with first and second inductance coil, forms the armature winding and secondary windings of transformer;One end of first inductance coil connects one end of the armature winding, one end of second inductance coil connects the other end of the armature winding, the other end of first, second inductance coil and the other end of the armature winding are used for the external power source for connecting the flat surface transformer, and the both ends of the secondary windings export the voltage after transformer transformation.The flat surface transformer has EMI function of shielding.

Description

Supply unit and its flat surface transformer
Technical field
The present invention relates to a kind of flat surface transformer, more particularly to one kind to have electromagnetic interference(Electromagnetic Interference, EMI)The flat surface transformer of function of shielding and the supply unit with the flat surface transformer.
Background technology
Transformer is a kind of conventional electronic component, be mainly used in power supply unit or power-switching circuit with lifted or Reduce the voltage on circuit.With electronic product towards miniaturization, lightening, high power etc. development trend under, it is electric to adapt to The development trend of sub- product, transformer are also needed towards small volume, lightening development, flat surface transformer because compared with conventional transformer, The height of magnetic device, the volume and weight of reduction magnetic device, the power density of raising magnetic device are significantly reduced, it is more applicable In the supply unit with frivolous requirement.But existing flat surface transformer easily produces electromagnetic interference, especially makes in high frequency Under, the situation of electromagnetic interference is even more serious so that the hydraulic performance decline of electronic product.
The content of the invention
In view of this, it is necessary to which a kind of flat surface transformer that can reduce EMI and the electricity using the flat surface transformer are provided Source device.
Embodiments of the invention provide a kind of flat surface transformer, including:
One magnetic core group, there is the upper magnetic core being oppositely arranged and lower magnetic core;
One transformer circuit board, it is arranged between the upper magnetic core and lower magnetic core, the transformer circuit board is provided with the One and second inductance coil, the armature winding and secondary windings that form transformer;First inductance coil and the second inductor wire Circle forms common mode inductance, and the armature winding of the transformer is connected to form differential mode inductance with first and second described inductance coil, The secondary windings exports the voltage after transformer transformation.
As a kind of preferred scheme, one end of first inductance coil connects one end of the armature winding, and described the One end of two inductance coils connects the other end of the armature winding, the other end of first, second inductance coil and described The other end of armature winding is used for the external power source for connecting the flat surface transformer.
As a kind of preferred scheme, first and second described inductance coil, the armature winding of transformer and secondary windings are The copper foil for the coiled type being printed in transformer circuit board.
As a kind of preferred scheme, first and second described inductance coil, the armature winding of transformer and secondary windings are The copper foil being printed on the different layers of transformer circuit board.
As a kind of preferred scheme, the number of turn and phase of first and second inductance coil are identically formed common mode inductance.
As a kind of preferred scheme, it is empty that the cabling of the armature winding of the transformer on circuit boards forms first and second Intend electric capacity, the first simulated capacitance is connected to primary winding both ends, and the second simulated capacitance is connected to primary winding One end and the second inductance coil one end between, first and second described simulated capacitance be used for the flat surface transformer switch frequency The noise of rate eliminates.
As a kind of preferred scheme, the upper magnetic core includes a quadrangle flat board and is located at the four of the quadrangle flat board Four stack piles, the triangle flat plate of same material on side;The shape of the lower magnetic core is consistent with the shape of upper magnetic core, under described Magnetic core is provided with an annular groove, and the annular groove center is provided with a raised circular columns, the center of the transformer circuit board Provided with through hole, the circular columns pass through the through hole, first and second described inductance coil, the armature winding and secondary of transformer Winding surrounds the through hole around the home.
As a kind of preferred scheme, the side walls of the circular columns is provided with two grooves, to logical on the inwall of the through hole Two projections coordinated with two grooves in the circular columns of hole center projection.
Embodiments of the invention also provide a kind of supply unit, including the as above flat surface transformer described in any one.
As a kind of preferred scheme, the supply unit includes a main circuit board, and the transformer circuit board is the master A part for circuit board;Or
The transformer circuit board and the main circuit board are the circuit board separated, include the institute of the transformer circuit board Flat surface transformer is stated to be installed on the main circuit board.
As a kind of preferred scheme, the supply unit includes rectification circuit, and the rectification circuit includes first, second 2 Pole pipe and the first and second electric capacity, one end of first inductance coil connect one end of the armature winding, second electricity The one end for feeling coil connects the other end of the armature winding, the anode connection external power source of first diode, and described the The negative electrode of one diode by the first electric capacity and the other end of second the second inductance coil of capacitance connection, the primary around The other end of group connects the connecting node and external power source of first electric capacity and the second electric capacity, the negative electrode of second diode The anode of the first diode is connected, the anode of second diode connects the other end of the primary winding.
As a kind of preferred scheme, the supply unit includes DC/DC circuits, and the DC/DC circuits are connected to rectified current Between road and the flat surface transformer, for the high direct voltage after rectifier circuit rectifies to be transformed into DC low-voltage.
As a kind of preferred scheme, the supply unit also includes a resonance circuit, and the resonance circuit includes the first MOS Pipe and the second metal-oxide-semiconductor, first metal-oxide-semiconductor are connected to the both ends of primary winding, and second metal-oxide-semiconductor is connected to primary Between the other end and ground of winding.
Flat surface transformer shown in the embodiment of the present invention uses a flat surface transformer magnetic core as magnet, in a plane Common mode inductance, differential mode inductance and switching frequency noise-filtering circuit are integrated with inside transformer, suppresses EMI, avoids in high frequency Disturbed using lower accurate electronic device by EMI.
Brief description of the drawings
In accompanying drawing:
Fig. 1 shows the stereogram of the supply unit of embodiment of the present invention.
Fig. 2 shows the three-dimensional exploded view of the supply unit of embodiment of the present invention.
Fig. 3 shows the circuit theory diagrams of supply unit shown in Fig. 1.
Main element symbol description
Supply unit 100
Main circuit board 30
Flat surface transformer 10
Upper magnetic core 12
Lower magnetic core 14
Transformer circuit board 16
Triangle flat plate 122
Gap 125
Annular groove 142
Circular columns 144
Groove 146
Breach 147
Through hole 162
Extension 164
Projection 166
First inductance coil Tb
Second inductance coil Tc
Armature winding Ta
Secondary windings Td
Rectification circuit 35
Resonance circuit 37
Switching frequency noise-filtering circuit 39
Power end 32、34
First diode D1
Second diode D2
First electric capacity C1
Second electric capacity C2
First metal-oxide-semiconductor Q1
Second metal-oxide-semiconductor Q2
First simulated capacitance Cr1
Second simulated capacitance Cr2
Following embodiment will combine above-mentioned accompanying drawing and further illustrate the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.Use with reference to explanation it is appreciated that accompanying drawing only provides, be not used for this hair It is bright to be any limitation as.The size shown in accompanying drawing is only to be described for ease of clear, and does not limit proportionate relationship.
It should be noted that when a component is considered as " connection " another component, it can be directly to separately One component may be simultaneously present component placed in the middle.Unless otherwise defined, all technologies used herein and section are academic Language is identical with belonging to the implication that the those skilled in the art of the present invention are generally understood that.Herein in the description of the invention Used term is intended merely to describe the purpose of specific embodiment, it is not intended that in the limitation present invention.
Fig. 1 and Fig. 2 is refer to, the embodiment of supply unit 100 of the present invention includes a main circuit board 30 and a plane transformation Device 10.
The flat surface transformer 10 includes upper magnetic core 12, the transformer circuit board 16 of lower magnetic core 14 and one, the upper magnetic core 12 Including quadrangle flat board made of a Ferrite Material(It is not shown), four thickness are provided with around four sides of the quadrangle flat board Spend material identical triangle flat plate 122 and a motherboard 123.Quadrangle flat board and triangle flat plate 122 are pasted by splicing Square or rectangle a upper magnetic core 12 is formed on motherboard 123.Leave in the place that four triangle flat plates 122 are in contact two-by-two Gap 125, make not touch mutually between the triangle flat plate 122, and also have between triangle flat plate 122 and quadrangle flat board Gap.
The lower magnetic core 14 of the transformer is an overall structure, and shape is consistent with the upper shape of magnetic core 12, is square or square Shape.The lower magnetic core 14 can be formed by die casting or formed by digital control processing.There is an annular groove on the lower magnetic core 14 142;There are a raised circular columns 144 in the center of annular groove 142, and two grooves 146 are provided with the side wall of circular columns 144.Under Four sides of magnetic core 14 are symmetrically arranged with four breach 147.Its structure formed is similar to the rotary island design of crossroad on highway. The effect of symmetrical four breach 147 in four sides is to position the position of upper and lower magnetic core 12,14 and transformer circuit board 16.
Also referring to Fig. 3, the transformer circuit board 16 is multilayer board, the transformer circuit board 16 with The shape of the rotary island design of the lower magnetic core 14 is corresponding to be provided with a through hole for running through transformer circuit board 16 into annular, its middle part 162, the outer rim of the transformer circuit board 16 extends outward four and corresponding with four breach 147 of the lower magnetic core 14 prolonged Extending portion 164.The transformer circuit board 16 is provided with the first inductance coil Tb, the second inductance coil Tc and to form transformer Armature winding and secondary windings Ta, Td, first, second inductance coil Tb, Tc and armature winding and secondary windings Ta, Td are by printing Copper foil of the system on the different layers of transformer circuit board 16 circularizes coiled type around the through hole 162 and formed around the home.Firstth, Copper foil cabling between two inductance coil Tb, Tc and the armature winding Ta of transformer by being arranged in transformer circuit board 16 And/or via(via)Form corresponding electrical connection.To through hole center projection two and the circle on the inwall of the through hole 162 The projection 166 that two grooves 146 on shape post 144 coordinate.In other embodiment, first, second inductance coil of each formation The copper foil of the armature winding and secondary windings Ta, Td of Tb, Tc and transformer also can be respectively formed in transformer circuit board 16 not With on layer.
The transformer circuit board 16 is arranged between upper and lower magnetic core 12,14, during assembling, first by the circle of lower magnetic core 14 Post 144 is inserted in the through hole 162 of transformer circuit board 16, and projection 166 is caught in groove 146, then again covers upper magnetic core 12 On lower magnetic core 14, mode for dispensing glue can be used mutually to bond upper and lower magnetic core 12,14.Plane in the embodiment of the present invention becomes In depressor 10, upper and lower magnetic core 12,14 is used as magnet, first, second coil Tb, Tc's and transformer in transformer circuit board 16 Primary and secondary windings Ta, Td are wound on the magnet.
In present embodiment, the flat surface transformer circuit board 16 is as the main circuit board 30 of the supply unit 100 A part, the armature winding of transformer and secondary windings Ta, Td are printed on main circuit board 30 and are used for mounting plane transformer 10 Region on, upper and lower magnetic core 12,14 is then formed into a flat surface transformer on the main circuit board 30 again.The plane transformation The wherein at least one extension 164 of device 10 is used to be connected with main circuit board 30.In other embodiment, the flat surface transformer Circuit board 16 can be two independent circuit boards separating with the main circuit board 30, flat surface transformer is made and then The transformer installation site being installed to the flat surface transformer by way of such as SMT welding on main circuit board 30.
The armature winding and secondary windings Ta, Td of the first inductance coil Tb, the second inductance coil Tc and transformer exist Laid in the transformer circuit board 16 by circuit as shown in Figure 3, one end connection institute of the first inductance coil Tb State armature winding Ta one end, one end of the second inductance coil Tc connects the other end of the armature winding Ta, and described the First, second inductance coil Tb, Tc other end and the armature winding Ta other end are used to connect the flat surface transformer 10 External power source, the both ends of the secondary windings Td export the voltage after the transformation of flat surface transformer 10.The transformer Described first and second inductance coil Tb, Tc number of turn and phase are identically formed common mode inductance on circuit board 16.
Rectification circuit 35 and resonance circuit are additionally provided with the main circuit board 30 of the supply unit(LLC circuits)37.It is described Rectification circuit 35 is used to the alternating current that supply unit power end 32,34 receives being converted to direct current.The rectification circuit 35 wraps Include first, second diode D1, D2 and first, second electric capacity C1, C2, the anode connection external electrical of the first diode D1 Source, the negative electrode of the first diode D1 pass through the another of the first electric capacity C1 and second electric capacity C2 the second inductance coils of connection Tc End, the other end of the primary winding Ta connect connecting node and the outside of the first electric capacity C1 and the second electric capacity C2 Power supply, the negative electrode of the second diode D2 connect the first diode D1 anode, the anode connection of the second diode D2 The other end of the primary winding Ta.
It will be understood by those skilled in the art that in other embodiment, the supply unit 100 can further include DC/DC circuits, the DC/DC circuits may connect between the rectification circuit 35 and the flat surface transformer 10, will for referring to High direct voltage after the rectification of rectification circuit 35 is transformed into DC low-voltage to input to flat surface transformer 10.
The resonance circuit 37 is connected to transformation including the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, the first metal-oxide-semiconductor Q1 Device armature winding Ta both ends, the second metal-oxide-semiconductor Q2 are connected between armature winding the Ta other end and ground, pass through control the One and second metal-oxide-semiconductor Q1 and Q2 switching frequency realize the constant of the output voltage of flat surface transformer 10.The plane is formed to become Cabling of the depressor armature winding Ta copper foil on flat surface transformer circuit board 16 also forms first and second simulated capacitance Cr1 And Cr2, the first simulated capacitance Cr1 are connected to primary winding both ends, the second simulated capacitance Cr2 is connected to primary Between winding Ta one end and the second inductance coil Tc one end, first and second simulated capacitance Cr1 and the Cr2 composition is opened Close the noise elimination that frequency noise filtering circuit 39 is used for the switching frequency of flat surface transformer 10.The flat surface transformer 10 fills When on main circuit board 30 with the rectification circuit 35 and resonance circuit(LLC circuits)37 collective effects are with the power supply to access Voltage, which is boosted or is depressured, to be handled and is supplied to follow-up electricity consumption device.First and second metal-oxide-semiconductor Q1 and Q2 is not integrated In the inside of the flat surface transformer 10, it is disposed on main circuit board 30.
The first inductance coil Tb and the second inductance coil Tc are wound on the upper magnetic core 12 of flat surface transformer 10 and lower magnetic core On 14, the number of turn and phase are all identically formed common mode inductance.So, when the normal current in circuit flows through common mode inductance, electric current Reverse magnetic field is produced in first and second inductance coil Tb, Tc of same-phase coiling and is cancelled out each other, now normal signal Electric current is mainly influenceed by coil resistance;When there is common mode current to flow through the common mode inductance, due to the same tropism of common mode current, Magnetic field in the same direction can be produced in first and second inductance coil Tb, Tc and increases the induction reactance of coil, coil is shown as high resistant It is anti-, stronger damping is produced, with this attenuation common-mode electric current, reaches the purpose of filtering.And the common mode inductance can be with The common mode EMI signal on circuit is set to be controlled on very low level.The EMI signal that the common mode inductance can both suppress outside passes Enter, the EMI signal circuit itself that can decay work again caused by, EMI interference strengths can be effectively reduced.
The armature winding Ta of the transformer is connected to rectification circuit and DC/DC circuits, forms differential mode inductance, that is, Say, be also integrated with differential mode inductance in the flat surface transformer 10, the differential mode inductance be multiplexed in flat surface transformer it is primary around Group Ta.DM EMI noise filtering can be prevented noise to reach suppression differential mode from being added in circuit below by the differential mode inductance The purpose of interference noise.
Flat surface transformer shown in the embodiment of the present invention uses a flat surface transformer magnetic core as magnet, in a plane Common mode inductance, differential mode inductance and switching frequency noise-filtering circuit are integrated with inside transformer, suppresses EMI, improves electromagnetic radiation Interference, avoid transformer makes the electronic device of precision be interfered in high frequency under, and the flat surface transformer, which has been saved, is Unite cost and space, in the supply unit for being more suitable for there is frivolous requirement.
In the present invention, term " first ", " second " are only used for the purpose of description, and it is not intended that instruction or hint are relative Importance, it is thus impossible to be interpreted as the limitation to invention.
In the description of this specification, the description of term " present embodiment ", " other embodiment " etc., which means to combine, is somebody's turn to do Embodiment or specific features, structure, material or the feature of example description are contained at least one embodiment or example of the present invention In.In this manual, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, retouch Specific features, structure, material or the feature stated can be in any one or more embodiments or example in an appropriate manner With reference to.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.

Claims (11)

1. a kind of flat surface transformer, including:
One magnetic core group, there is the upper magnetic core being oppositely arranged and lower magnetic core;
One transformer circuit board, be arranged between the upper magnetic core and lower magnetic core, the transformer circuit board be provided with first and Second inductance coil, the armature winding and secondary windings for forming transformer;The number of turn and phase of first and second inductance coil Position is identically formed common mode inductance, and the armature winding of the transformer is connected to form differential mode electricity with first and second described inductance coil Sense, the secondary windings export the voltage after transformer transformation;
Wherein, one end of first inductance coil connects one end of the armature winding, one end of second inductance coil Connect the other end of the armature winding, the other end of first, second inductance coil and the other end of the armature winding For connecting the external power source of the flat surface transformer.
2. flat surface transformer as claimed in claim 1, it is characterised in that described first and second inductance coil, transformer Armature winding and secondary windings are the copper foil for the coiled type being printed in transformer circuit board.
3. flat surface transformer as claimed in claim 1, it is characterised in that described first and second inductance coil, transformer Armature winding and secondary windings are the copper foil being printed on the different layers of transformer circuit board.
4. flat surface transformer as claimed in claim 1, it is characterised in that the armature winding of the transformer is on circuit boards Cabling forms first and second simulated capacitance, and the first simulated capacitance is connected to primary winding both ends, the second simulated capacitance It is connected between one end of primary winding and one end of the second inductance coil, first and second described simulated capacitance is used for The noise of the flat surface transformer switching frequency eliminates.
5. flat surface transformer as claimed in claim 1, it is characterised in that the upper magnetic core includes a quadrangle flat board and set Four stack piles, the triangle flat plate of same material on four sides of the quadrangle flat board;The shape of the lower magnetic core with it is upper The shape of magnetic core is consistent, and the lower magnetic core is provided with an annular groove, and the annular groove center is provided with a raised circular columns, institute The center for stating transformer circuit board is provided with through hole, and the circular columns pass through the through hole, first and second described inductance coil, become The armature winding and secondary windings of depressor surround the through hole around the home.
6. flat surface transformer as claimed in claim 5, it is characterised in that the side wall of the circular columns is provided with two grooves, To two projections coordinated with two grooves in the circular columns of through hole center projection on the inwall of the through hole.
7. a kind of supply unit, including the flat surface transformer as described in claim any one of 1-6.
8. supply unit as claimed in claim 7, it is characterised in that the supply unit includes a main circuit board, the change Transformer circuits plate is a part for the main circuit board;Or the transformer circuit board and the main circuit board are the circuit separated Plate, including the flat surface transformer of the transformer circuit board are installed on the main circuit board.
9. supply unit as claimed in claim 7, it is characterised in that the supply unit includes rectification circuit, the rectification Circuit includes first, second diode and the first and second electric capacity, one end connection of first inductance coil it is described it is primary around One end of group, one end of second inductance coil connect the other end of the armature winding, the anode of first diode Connect external power source, the negative electrode of first diode is another by the first electric capacity and second the second inductance coil of capacitance connection End, the other end of the primary winding connect the connecting node and external power source of first electric capacity and the second electric capacity, The negative electrode of second diode connects the anode of the first diode, at the beginning of the anode of second diode connects the transformer The other end of level winding.
10. supply unit as claimed in claim 8, it is characterised in that the supply unit includes DC/DC circuits, the DC/ DC circuits are connected between rectification circuit and the flat surface transformer, for the high direct voltage after rectifier circuit rectifies to be converted Into DC low-voltage.
11. supply unit as claimed in claim 8, it is characterised in that the supply unit also includes a resonance circuit, described Resonance circuit includes the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, and first metal-oxide-semiconductor is connected to the both ends of primary winding, described Second metal-oxide-semiconductor is connected between the other end of armature winding and ground.
CN201610165108.5A 2016-03-22 2016-03-22 Supply unit and its flat surface transformer Active CN105634265B (en)

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Application Number Priority Date Filing Date Title
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CN105634265B true CN105634265B (en) 2018-04-03

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CN110739859B (en) * 2019-11-28 2021-11-30 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) Symmetrical half-bridge resonance open-loop direct-current proportional converter

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CN201833102U (en) * 2010-11-05 2011-05-18 深圳市华意隆实业发展有限公司 Inverter type welding-cutting machine with half-bridge soft switch
CN102360787B (en) * 2011-09-28 2013-04-24 深圳市京泉华科技股份有限公司 Planar transformer and magnetic core thereof
CN104093245A (en) * 2014-07-03 2014-10-08 广东良得光电科技有限公司 Efficient isolation type LED drive circuit

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