CN105405624A - Current transformer of printed circuit board - Google Patents
Current transformer of printed circuit board Download PDFInfo
- Publication number
- CN105405624A CN105405624A CN201510736656.4A CN201510736656A CN105405624A CN 105405624 A CN105405624 A CN 105405624A CN 201510736656 A CN201510736656 A CN 201510736656A CN 105405624 A CN105405624 A CN 105405624A
- Authority
- CN
- China
- Prior art keywords
- copper foil
- circuit board
- printed circuit
- layer
- current transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F2027/348—Preventing eddy currents
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
Abstract
The invention discloses a current transformer of a printed circuit board, relates to the technical field of current transformers, and aims at solving the problem of a relatively poor hot line of a conventional current transformer. A primary winding of the current transformer of the printed circuit board is formed by winding two one-turn copper foils in parallel; the two one-turn copper foils are respectively located on the first layer of the printed board and the second layer of the printed board; one turn of copper foil on the first layer of the printed board is connected with one turn of copper foil on the second layer of the printed board through four solid blind holes with the diameters of 0.66mm in parallel; a secondary winding is formed by winding 30 turns of copper foil windings in series; the 30 turns of copper foil windings are located on the third layer to the tenth layer of the printed circuit board respectively; the copper foil windings on different layers of the printed board are connected with one another through solid through holes with the diameters of 0.66mm in series; a core board of the printed circuit board is made of a TU752 material; the thicknesses of the copper foils are 105microns; and laminated materials between different layers are prepregs of which the model number is 1080.
Description
Technical field
The present invention relates to current transformer technical field, particularly relate to a kind of printed circuit board current transformer.
Background technology
In the Switching Power Supply that low-voltage and high-current exports, current control mode is a kind of important control model, and under this control model, the change of load current will be reacted at feedback loop, and have an impact to output voltage before performing duty cycle correction.Current control mode has lot of advantages, and such as power supply is fast to input voltage change response; Eliminate magnetic flux imbalance; Feedback compensation easily designs; Possesses Cycle by Cycle overcurrent limiting ability; System transients response during power source loads height change can be improved.Current transformer is the important devices of current control mode Switching Power Supply, and it is responsible for detecting source current, and the magnitude of current is converted to voltage, facilitates control chip to detect.
At present, what current control mode Switching Power Supply was conventional is a kind of Wound-rotor type soft magnetic ferrite current transformer, and primary side normally has the copper strips winding necessarily walking current capacity and forms, and primary side is normally formed by the enamelled wire of setting turn ratio coiling.Along with the development of application scenario, and the level of application improves, and also improves constantly, require that power supply has higher efficiency, higher reliability, less volume to the requirement of current control mode Switching Power Supply.For this reason, power transformer must operate in higher frequency (more than 200KHz), and traditional Wound-rotor type soft magnetic ferrite current transformer exists a lot of shortcoming in high-frequency application, and its shortcoming main manifestations is as follows:
Heat dispersion is poor, and traditional Wound-rotor type soft magnetic ferrite current transformer heating is difficult to shed, and needs to carry out extra radiating treatment in the application scenario of high frequency large detection electric current.
Summary of the invention
Embodiments of the invention provide a kind of printed circuit board current transformer, in order to solve the poor problem of traditional current transformer hot line.
In order to achieve the above object, embodiments of the invention adopt following technical scheme:
A kind of printed circuit board current transformer, primary side winding adopts two 1 circle Copper Foil coilings in parallel, two 1 circle Copper Foil windings lay respectively at printed board ground floor and the printed board second layer, and 1 circle Copper Foil winding on printed board ground floor is in parallel by 4 solid blind holes of diameter 0.66mm with 1 circle Copper Foil winding on the printed board second layer; Primary side winding adopts 30 circle Copper Foil windings in series coilings, and 30 circle Copper Foil windings lay respectively at the third layer of printed circuit board to the tenth layer, and the Copper Foil winding in the different printed board number of plies is by the series connection of diameter 0.66mm solid vias; The central layer of printed circuit board adopts TU752 material, and the thickness of Copper Foil is 105um, the pressing material between different layers to be model be 1080 prepreg.
Beneficial effect of the present invention is: the printed circuit board current transformer that the embodiment of the present invention provides is compared with traditional Wound-rotor type soft magnetic ferrite current transformer, and its remarkable advantage is:
(1) electric current is detected large, primary side winding adopts two 1 circle Copper Foil coilings in parallel, current density is higher than traditional Wound-rotor type winding, especially in the application of power adopting multilayer printed board design, the present invention is adapted at being dissolved in the design process of power supply in the multilayered printed slab integral of power supply, without the need to being connected by solder joint, add the reliability of checking of great current.
(2) loss is little, and the design's printed circuit board current transformer adopts the thick Copper Foil of 105um as winding, reduces eddy current effect, skin effect and adjacent side effect to the impact of winding, ensure that the low-loss of current transformer in frequency applications occasion.
(3) parameter consistency is high, coupling between the design's printed circuit board current transformer primary side winding and primary side winding is tightr, make the circle of winding inter-turn fall apart parameter reduce, in addition printed circuit board process ensure, the parameter consistency of the design's printed circuit board current transformer is high.
(4) perfect heat-dissipating, the design's printed circuit board current transformer has very high table bulk area ratio, and the Copper Foil winding of plane has high heat-sinking capability, if be dissolved in the multilayered printed slab integral of power supply in the design process of power supply, the passage of heat of winding is shorter, and heat-sinking capability is stronger.
(5) cost is low, and the design's printed circuit board current transformer is made up of cheap component relevant on a small quantity, after die sinking in the early stage expense of printed circuit board, the veneer price in later stage is low, in addition easy to assembly, do not need the skilled worker of specialty, cost is reduced.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for this area or those of ordinary skill, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 for no-load voltage ratio that the embodiment of the present invention provides be the Current Mutual Inductance topological structure of 1 to 30;
The structure chart of the printed circuit board current transformer magnetic element that Fig. 2 provides for the embodiment of the present invention;
The structure of printed circuit board current transformer winding in printed circuit board different layers that Fig. 3 provides for the embodiment of the present invention;
Process structure between the printed circuit board current transformer different layers that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not paying creative work, all belongs to protection scope of the present invention.
Embodiments provide a kind of printed circuit board current transformer, the no-load voltage ratio that current control mode Switching Power Supply uses is the printed circuit board current transformer of 1 to 30, and sense cycle pulse current is 20A.In the structure of current transformer primary side winding in printed circuit board, the structure of secondary transformer side winding in printed circuit board, the material of printed circuit board current transformer is formed, the pressing structure of printed circuit board current transformer in the fabrication process between different layers.
The structure of described current transformer primary side winding in printed circuit board, primary side winding adopts two 1 circle Copper Foil coilings in parallel, two 1 circle Copper Foils are positioned in the number of plies of different printed circuit boards, wherein 1 circle Copper Foil is positioned on printed board ground floor, another 1 circle Copper Foil is positioned on the printed board second layer, and 1 circle Copper Foil on printed board ground floor is in parallel by 4 solid blind holes of diameter 0.66mm with 1 circle Copper Foil on the printed board second layer.
The structure of described secondary transformer side winding in printed circuit board, primary side winding adopts 30 circle Copper Foil series connection coilings, 30 circle windings are distributed between the third layer of printed circuit board and the tenth layer successively, and the winding between different layers is by the series connection of diameter 0.66mm solid vias.
The material of described printed circuit board current transformer is formed, it is characterized in that the central layer of printed circuit board adopts TU752 material, improve the heat-resisting ability of current transformer, the thickness of Copper Foil is 105um, the pressing material between different layers to be model be 1080 prepreg.
The process structure of described printed circuit board current transformer in the fabrication process between different layers, it is characterized in that the usage quantity of printed circuit board different materials in the flat surface transformer course of processing, overlapped way between different materials, the process sequence of different layers in the course of processing.
The topological structure of printed circuit board current transformer of the present invention as shown in Figure 1.Current transformer primary side umber of turn 1 circle, primary side umber of turn 30 circle.Switching device in frequency period with certain duty ratio conducting, duty ratio capital D represents, during switch device conductive, electric current flows through the level side winding of current transformer, at switching device blocking interval, primary side winding current ends, and presents exchange status by the electric current of current transformer primary side winding.The alphabetical Ip of printed circuit board current transformer primary side winding current represents, the alphabetical Is of primary side winding current represents, the alphabetical Np of primary side umber of turn represents, the alphabetical Ns of primary side umber of turn represents, Ip, Is and Np, the relation of Ns is shown in formula (1):
The sample resistance of primary side winding represents with letter r, and the alphabetical Vs of induced voltage represents, induced voltage Vs and Ip, and the relation of Is, Np, Ns, R is shown in formula (2):
Vs＝R*Is＝R*Ip*Np/Ns(2)
The structure of Copper Foil winding is determined by the magnetic core model of current transformer, operating frequency, current density.The manufacturer that the present invention customizes magnetic core is Ferroxcube, and model is ER14.5/3/7-3C95, sees Fig. 2.It is 17.3mm that core cross section amasss Ae
2, length of magnetic path Le is 19mm, and volume Ve is 333mm
3, weight is 0.9g, and the material of magnetic core is 3C95, and saturation flux density Bs is about 480mT.The peak-peak magnetic flux density Bp-p of current transformer and Ae, Vs, Ns, and the relation of operating frequency F is shown in formula (3):
When operating frequency F is 10KHz, sample resistance R is 1.5 Ω, when induced voltage Vs is 1V, no-load voltage ratio of the present invention is the peak-peak magnetic flux density Bp-p of 1 to 30 printed circuit board current transformer is 195mT, Bp-p is no more than 960mT, meet magnetic core parameter request, the application scenario of current control mode Switching Power Supply can be applicable to.
The structure of printed circuit board current transformer primary and secondary side winding in printed circuit board different layers as shown in Figure 3.Printed circuit board ground floor is the copper foil structure of primary side winding, and the number of turn is 1; The printed circuit board second layer is the copper foil structure of primary side winding, and the number of turn is 1; Printed circuit board third layer is the copper foil structure of primary side winding to the tenth layer, and the number of turn is 30.The primary side winding of ground floor and the second layer is in parallel by blind hole, and the primary side winding of third layer to the tenth layer is connected by through hole.
The copper thickness 105um of primary side winding of the present invention, Copper Foil mean breadth is 84mil, the copper thickness 105um of primary side winding, Copper Foil mean breadth is 10mil, according to IPC-D-275 criterion calculation, primary side winding is at the skin of printed circuit board, the rated current of setting primary side winding is 20A, calculate primary side winding is 13.251 DEG C relative to the temperature rise of ambient temperature, primary side winding is at the internal layer of printed circuit board, electric current is 0.67A, calculates primary side winding is 7 DEG C relative to the temperature rise of ambient temperature.
Printed circuit board current transformer winding adopts the copper foil structure of complanation to have the short-range missile passage of heat, feature that heat-sinking capability is strong, can well by delivered heat to outer casing of power supply or power supply circuit board other parts.
Shown in process structure Fig. 4 between current transformer printed circuit board different layers.Processing step one: carve in the central layer one side of material to be TU752 copper thickness be 105um and chisel second layer Copper Foil winding, the another side of central layer removes Copper Foil and does dead level.Processing step two: central layer two sides each pressing two panels model of step one be 1080 prepreg and a slice thickness be 105um Copper Foil, and carve chisel ground floor Copper Foil winding and third layer Copper Foil winding.Processing step three: by ground floor Copper Foil to third layer Copper Foil drill diameter 0.66mm blind hole, heavy copper thickness 2um, electroplating copper plughole, makes buried via hole solidization, increases the ability walking electric current.Processing step four: carve on the central layer two sides of material to be TU752 copper thickness be 105um and chisel layer 5 Copper Foil winding and layer 6 Copper Foil winding.Processing step five: central layer two sides each pressing two panels model of step 4 be 1080 prepreg and a slice thickness be 105um Copper Foil, and carve chisel the 4th layer of Copper Foil winding and layer 7 Copper Foil winding.Processing step six: carve in the central layer one side of material to be TU752 copper thickness be 105um and chisel the 9th layer of Copper Foil winding, the another side of central layer removes Copper Foil and does dead level.Processing step seven: central layer two sides each pressing two panels model of step 6 be 1080 prepreg and a slice thickness be 105um Copper Foil, and carve chisel the 8th layer of Copper Foil winding and the tenth layer of Copper Foil winding.Processing step eight: the prepreg being 1080 by three models between the printed circuit board of the printed circuit board of the printed circuit board of step 5, step 3, step 8 is pressed into entirety.Processing step nine: by ground floor Copper Foil to the tenth layer of Copper Foil drill diameter 0.66mm through hole, heavy copper thickness 2um, electroplating copper plughole, makes through hole solidization, increases the ability walking electric current.
In the description of this specification, specific features, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those of ordinary skill in the art are in the scope that the present invention discloses; the change that can expect easily or replacement, all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (1)
1. a printed circuit board current transformer, it is characterized in that: primary side winding adopts two 1 circle Copper Foil coilings in parallel, two 1 circle Copper Foil windings lay respectively at printed board ground floor and the printed board second layer, and 1 circle Copper Foil winding on printed board ground floor is in parallel by 4 solid blind holes of diameter 0.66mm with 1 circle Copper Foil winding on the printed board second layer; Primary side winding adopts 30 circle Copper Foil windings in series coilings, and 30 circle Copper Foil windings lay respectively at the third layer of printed circuit board to the tenth layer, and the Copper Foil winding in the different printed board number of plies is by the series connection of diameter 0.66mm solid vias; The central layer of printed circuit board adopts TU752 material, and the thickness of Copper Foil is 105um, the pressing material between different layers to be model be 1080 prepreg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736656.4A CN105405624A (en) | 2015-11-04 | 2015-11-04 | Current transformer of printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736656.4A CN105405624A (en) | 2015-11-04 | 2015-11-04 | Current transformer of printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105405624A true CN105405624A (en) | 2016-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510736656.4A Pending CN105405624A (en) | 2015-11-04 | 2015-11-04 | Current transformer of printed circuit board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107017773A (en) * | 2017-06-09 | 2017-08-04 | 上海逸伏汽车电子科技有限公司 | Vehicle-mounted DC/DC changer systems |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0514136A1 (en) * | 1991-05-15 | 1992-11-19 | International Business Machines Corporation | An improved transformer |
| JPH07220926A (en) * | 1994-02-08 | 1995-08-18 | Tokin Corp | Thin spiral coil part, coil element using said part & current transformer with coil element |
| JP2000021661A (en) * | 1998-06-30 | 2000-01-21 | Omron Corp | Ct type current sensor |
| CN1726518A (en) * | 2002-12-18 | 2006-01-25 | 卡施科德公司 | Induction sensor using printed circuit |
| CN201478089U (en) * | 2009-08-10 | 2010-05-19 | 深圳市创世富尔电子有限公司 | High-power planar transformer |
| CN102103923A (en) * | 2009-12-18 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | Planar transformer |
| CN102237187A (en) * | 2010-04-30 | 2011-11-09 | 深圳市澳磁电源科技有限公司 | Planar transformer and method for manufacturing same through integration |
-
2015
- 2015-11-04 CN CN201510736656.4A patent/CN105405624A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0514136A1 (en) * | 1991-05-15 | 1992-11-19 | International Business Machines Corporation | An improved transformer |
| JPH07220926A (en) * | 1994-02-08 | 1995-08-18 | Tokin Corp | Thin spiral coil part, coil element using said part & current transformer with coil element |
| JP2000021661A (en) * | 1998-06-30 | 2000-01-21 | Omron Corp | Ct type current sensor |
| CN1726518A (en) * | 2002-12-18 | 2006-01-25 | 卡施科德公司 | Induction sensor using printed circuit |
| CN201478089U (en) * | 2009-08-10 | 2010-05-19 | 深圳市创世富尔电子有限公司 | High-power planar transformer |
| CN102103923A (en) * | 2009-12-18 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | Planar transformer |
| CN102237187A (en) * | 2010-04-30 | 2011-11-09 | 深圳市澳磁电源科技有限公司 | Planar transformer and method for manufacturing same through integration |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107017773A (en) * | 2017-06-09 | 2017-08-04 | 上海逸伏汽车电子科技有限公司 | Vehicle-mounted DC/DC changer systems |
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