EP2533255A1 - Magnetfeldinduktor - Google Patents

Magnetfeldinduktor Download PDF

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Publication number
EP2533255A1
EP2533255A1 EP12171066A EP12171066A EP2533255A1 EP 2533255 A1 EP2533255 A1 EP 2533255A1 EP 12171066 A EP12171066 A EP 12171066A EP 12171066 A EP12171066 A EP 12171066A EP 2533255 A1 EP2533255 A1 EP 2533255A1
Authority
EP
European Patent Office
Prior art keywords
trace
inductor
plate
plates
presenting
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.)
Granted
Application number
EP12171066A
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English (en)
French (fr)
Other versions
EP2533255B1 (de
Inventor
Luca Fossati
Bruno Sessa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F&B International Srl
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F&B International Srl
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Filing date
Publication date
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Publication of EP2533255A1 publication Critical patent/EP2533255A1/de
Application granted granted Critical
Publication of EP2533255B1 publication Critical patent/EP2533255B1/de
Active legal-status Critical Current
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F17/0013—Printed inductances with stacked layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F2017/0066—Printed inductances with a magnetic layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F2017/0073—Printed inductances with a special conductive pattern, e.g. flat spiral

Definitions

  • the present invention relates to a magnetic field inductor.
  • Magnetic field inductors currently consist of solenoids formed from an electrical conductor (electric wire) wound in several coil turns to form a coil.
  • the magnetic field intensity at the centre is equal to the sum of that generated by each turn.
  • the induction value obtained by the coil will not be exactly the algebraic sum of that generated by each individual turn, but there will be a loss due to the fact that each coil turn has a physical thickness and withdraws from the centre in every direction with the progress of the winding and the superimposing of the layers. Moreover every coil composed of a large number of turns is provided with a plastic support (spool) on which the wire is wound.
  • each coil winding has its own thickness it withdraws increasingly more from the centre, both in the depth direction and by incrementing its starting radius.
  • incrementing the induction level is mainly achieved by adding more turns to create a coil, however in this manner the distance from the centre continuously increases in all directions and the efficiency decreases, so incrementing the electrical resistance and incrementing the inductive level of the system, hence slowing down the system in the transient regime and increasing the coil weight and cost.
  • an electromagnet is obtained which continuously and alternately attracts and repels any ferromagnetic material or polar substance positioned in proximity thereto.
  • This principle is utilized in the electro medical field and specifically in the magnetotherapy field.
  • the human body is composed largely of water (which is a polar substance)
  • the pulsating electromagnet stresses the cutaneous and subcutaneous zone with continuous attraction or repulsion actions, to provide therapeutic action.
  • electromedical appliances implement the electromagnet or LF (low frequency) emitter with frequencies which range up to a maximum of 200 Hz, using a coil of any size, power and final geometry, however this is always formed by winding a conductor to form a coil able to generate a determined size of pulsating magnetic field.
  • LF low frequency
  • a normal 100 Gauss coil used in the electromedical field has a weight of about 167 g for a diameter of 60 cm and a height of 16.5 cm.
  • known coils provide a magnetic field which is not specifically suitable in magnetotherapy applications, in that this develops outside the solenoid in the axial direction from both sides of the coil, both from the side on which the treatment is to be carried out and on the opposite side, hence there is a loss of system efficiency and the result obtained does not exactly conform to that desired.
  • An object of the present invention is therefore to provide a magnetic field inductor which represents an improvement over the known art.
  • a further object of the present invention is to provide an inductor which, for the same generated magnetic field, is lighter and of smaller dimensions than traditional coils, for the same generated magnetic field.
  • the main size reduction regards the emitter thickness, which is further reduced by there being no need for the winding spool.
  • the present invention enables improved dissipation of the heat generated by the direct or pulsating electric current passing through the coil turns or through the constituent traces of the emitter.
  • a further advantage of the present invention is that of providing an inductor enabling a magnetic field to be obtained which develops mainly on a single side, being concentrated towards a single direction and a specific area of use.
  • the emitter is formed from a plurality of individual superimposed layers (or plates) A, B, C, D, E which are adhesive-bonded and pressed together.
  • Each emitter layer is substantially a printed circuit on a printed circuit board (PCB).
  • PCB printed circuit board
  • the symbol PCB indicates an insulating material base (usually epoxy resin reinforced with glass fibre) on which connection lines of conductive material (usually copper) are formed between the circuit elements.
  • a PCB is known as mono- or single-face type when composed of a single layer of insulating resin and a single layer of conductive material which is the photographic image of the electrical connections to be obtained.
  • a PCB is produced starting from a plate of insulating resin on which a thin homogeneous sheet of copper has been applied to totally cover the insulating base. The part not involved in the image to be obtained is then eroded by a series of photographic and chemical processes, to obtain at the end of the process an insulating base with the photographic image of the desired circuit in conductive material.
  • the PCB in the form of a semifinished product is suitably bored with a specific numerically controlled drill to facilitate its connection to other components.
  • the PCB usually undergoes a series of enhancements to finish the product, including the application of an electrically insulating varnish known as "solder resist" by a masking process, implemented only at the points where the PCB must not have electrical access to the outside, by which the traces and the areas at voltage become totally insulated, on one side by the base resin and on the other side by the solder resist protective varnish, to leave uncovered only the trace ends, i.e. where normally soldering is carried out to connect a component or a wire or a connection towards the outside.
  • solder resist electrically insulating varnish
  • the PCB usually undergoes two further finishing processes, such as the application of a silk screen print by which an actual design is made with a non-conductive varnish to facilitate identification of the components or to print other information useful in recognizing the product.
  • a further process undergone by the PCB is the surface treatment of those areas exposed to the air (not covered by solder resist), to ensure their protection against the typical oxidation of bare copper, this treatment typically being a covering with tin alloy spread hot on the PCB, or a chemical or electrolytic deposition such as silver or gold plating if extreme planarity or very low contact resistances are required.
  • the present invention relates to a multi-layer double-face emitter.
  • a double-face circuit is composed of a single insulating resin support on which two copper sheets are applied, one on each side of the support, these being processed simultaneously as aforedescribed.
  • the final circuit can be more complex, because in this case a wire connection is emulated at which the conductors can mutually cross and be superimposed, enabling a more complex scheme to be implemented.
  • This procedure requires a more well-organized production process to enable a connection present on one side to be able to also continue on the opposite side.
  • a through hole is made at the point in which the two layers are to be connected together, then by means of an electrolytic process a conductive galvanic deposit is formed within the hole, the applied material cladding the walls of the hole to connect together the two traces present on the opposite sides.
  • This connection type is known as a "metallized hole” or "metallization”.
  • a trace of small thickness (usually from 30 to 100 ⁇ m) is formed extending as a spiral, or any other geometry of convenience able to concentrate the magnetic field generated by the passage of electric current in a predefined single point, which is usually but not essentially the centre.
  • FIG. 1 shows a first face A1 of a plate A made of insulating resin.
  • a trace 5 is formed of spiral shape.
  • the trace thickness is usually between 10 and 200 ⁇ m, preferably 70/100 ⁇ m
  • the plate width is between 0.1 and 20 mm, preferably 1 mm
  • each side of the plate presents a number of turns between 1 and 200, preferably 20.
  • a base material is used in which the sum of the copper trace and of the insulating resin gives a total thickness of 0.25 mm for each individual layer.
  • the final shape of the product is totally arbitrary; in the specific example, although the traces are of circular pattern, the outer profile of the emitter is square (of 58 mm side), but could be adapted to any convenient geometry.
  • the trace extends from a first contact 12 to a second contact 7. These serve to electrically power the spiral.
  • the contact 12 represents one end of the emitter
  • the contact 7 represents an intermediate point thereof, namely a point which joins to the next side of the printed circuit.
  • the plate A presents a second face A2 opposite the first.
  • a second trace (not shown) is formed having the shape, characteristics and axis 6 substantially identical to those of the first trace, the only difference being the on the second face the spiral turn is designed specularly such that the current path and the consequent magnetic field generation do not change direction and hence does not nullify that generated on the first layer but instead adds to it.
  • This however is connected to the contact 7 and to the contact 13 in proximity to the axis 6.
  • the electrical connections between the trace on the first face and that on the second face, the geometry of the paths and the geometry of the connections ensure that the current circulates always in the same direction about the axis 6, hence enabling magnetic fields to be generated which are added together at the axis.
  • a second plate B, a third plate C, a fourth plate D and a fifth plate E are adhesive-bonded and pressed on the first plate A.
  • All the plates A, B, C, D, E (five in all) and the traces formed on them (ten in all) are substantially identical in pairs (i.e. the turns present on the five upper sides and the turns present on the five lower sides of each plate are identical to each other with the exception of the contacts to which these are connected, which are those indicated by the numerals from 7 to 11, and from 12 to the final contact (not shown).
  • listing the connections are: 12 (inlet conductor connection), 7 (joins side 1 to side 2 concerning the plate A), 13 (joins side 2 to side 3 concerning the plates A and B), 8 (joins side 3 to side 4 concerning the plate B), 14 (joins side 4 to side 5 concerning the plates B and C), 9 (joins side 5 to side 6 concerning the plate C), 15 (joins side 6 to side 7 concerning the plates C and D), 10 (joins side 7 to side 8 concerning the plate D), 16 (joins side 8 to side 9 concerning the plates D and E), 11 (joins side 9 to side 10 concerning the plate E), final contact at outlet.
  • the plate E (i.e. the last) can be positioned resting on (or fixed for example by glue or other manner to) a layer of electrically insulating but thermally conductive rubber.
  • the rubber layer is then associated on the opposite side of the plate E to a sheet of ferromagnetic material 3.
  • the rubber positioned in contact with the lower side of the emitter (in this case the plate E) enables the active electric power to be dispersed, i.e. to dissipate in advantageous manner the heat produced by the current flowing through the traces, so transporting this heat from the active part of the emitter to the ferromagnetic backing plate which here also acts as a thermal dissipater.
  • the planar shape of the product, the absence of winding spools, and the fact that the coil turns are not wound but are formed on the printed circuit by tracing any desired geometry, enable any regular or irregular final shape to be obtained.
  • a further innovation is the already described application of a ferromagnetic backing plate to compress the flux lines.
  • this electromagnetic field modification is particularly useful for those emitters used in the electromedical field which utilize the magnetic flux generated by a single side. These are usually rested on the zone to be treated.
  • the circular nature of traditional coils makes the emitter develop the flux lines symmetrically on both sides of the emitter, dispersing one half of the generated magnetic field which is hence not used for therapeutic purposes.
  • the present invention also provides other advantageous advantages compared with traditional coils.
  • PCB technology enables the emitters to demonstrate performance differences between product units pertaining either to the same batch or to different batches which are much smaller than that which can generally be obtained on comparing the performance differences of several coils constructed to the same specification.
  • the high confidence range is due mainly to the high packing geometry of the wire which at each revolution rests in the spool with a certain position tolerance, moreover the tension (winding torque) with which the wire is wound makes a considerable difference because the coil can become more or less compact, hence varying its final performance.
  • a flat coil integrated on a PCB given its flat geometry, also enables devices to be constructed of smaller dimensions, less bulky and lighter in weight.
  • the use of the present invention enables a pulsatingly controlled electromagnet or a pulsating magnetic emitter to be created, to obtain a determined magnetic induction value on its surface.
  • the figures show by way of example an emitter implemented on a PCB of 10 layers.
  • Figure 1 shows how the turn geometry is visible at the surface on one of the two outer sides (a ten-layer PCB presents eight internally hidden sides and two surface visible sides).
  • a ten-layer PCB presents eight internally hidden sides and two surface visible sides.
  • the ten superimposed layers are shown together with the metallized holes used to connect each side to the next in order to simulate a continuously wound wire, i.e. to emulate a coil.
  • a further advantage achieved by implementing such pulsating magnetic field inductors on a PCB support lies in the fact that because of the small thickness several inductors can be stacked to still achieve an acceptable efficiency. If in contrast several air-wound coils were stacked, seeing the considerable thickness, the emissions of the first coil would be nullified before reaching the outer surface of the second and so on.
  • the geometry of the spirally wound copper trace present on each side of the PCB possesses a flat and wide geometry, presenting a contact surface to the outside which is much larger than that achievable with an enamelled conductor of circular cross-section used in forming traditional coils, this fact aiding the dispersion of the heat generated by the passage of electric current.
  • a radiofrequency transmission antenna can be integrated into at least one side of the emitter, usually the most outer side towards the treatment area, to hence enable combination emitters to be implemented in which the therapeutic effects of low frequency (pulsating magnetic field) and of high frequency (radio waves) can be added together.
  • This implementation or the extension of this concept enables electronic measurement and control circuits to be integrated into the same emitter, making the device intelligent and reducing costs and dimensions.
  • spiral turns of the traces present on the various constituent plates of the inductor present a substantially circular path, however alternative embodiments can assume any shape, regular or irregular (square, rectangular, elliptical, composite geometries of any extent and type).
  • the aforedescribed inductor taken as an example to described the invention is formed from five double layer plates adhesive-bonded and pressed together (ten layers in total), this number can obviously be increased or decreased or more finished figures can be stacked with or without the use of the ferromagnetic backing plate, to form emitters of adequate power capable of enabling emission of a magnetic flux of required extent and geometry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Magnetic Treatment Devices (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)
EP20120171066 2011-06-09 2012-06-06 Magnetfeldinduktor Active EP2533255B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001036A ITMI20111036A1 (it) 2011-06-09 2011-06-09 Induttore di campo magnetico

Publications (2)

Publication Number Publication Date
EP2533255A1 true EP2533255A1 (de) 2012-12-12
EP2533255B1 EP2533255B1 (de) 2014-01-29

Family

ID=44554943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120171066 Active EP2533255B1 (de) 2011-06-09 2012-06-06 Magnetfeldinduktor

Country Status (4)

Country Link
EP (1) EP2533255B1 (de)
ES (1) ES2460923T3 (de)
IT (1) ITMI20111036A1 (de)
PT (1) PT2533255E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20152081A1 (it) * 2015-07-10 2017-01-10 Thereson S P A Procedimento di produzione di un diffusore e corrispondente diffusore
WO2019092653A1 (en) * 2017-11-10 2019-05-16 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Induction heater for a cook top

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB639591A (en) * 1947-09-08 1950-06-28 Standard Telephones Cables Ltd Improvements in or relating to inductive electrical windings
GB1440304A (en) * 1974-11-29 1976-06-23 Mullard Ltd Transmission line pulse transformers
JPS58212114A (ja) * 1982-06-02 1983-12-09 Showa Electric Wire & Cable Co Ltd コイルの含浸処理方法
US4494100A (en) * 1982-07-12 1985-01-15 Motorola, Inc. Planar inductors
DE8801879U1 (de) * 1988-02-13 1988-04-07 Akyürek, Altan, Dipl.-Ing., Wien Induktivität für Leistungselektronik- bzw. Leistungselektrikanwendungen
EP0428142A2 (de) * 1989-11-15 1991-05-22 The B.F. Goodrich Company Anordnung für flache Spulen
DD290738A5 (de) * 1989-12-22 1991-06-06 Veb Robotron-Messelektronik,"Otto Schoen",De Sende- und/oder empfangsspule aus mehrebenenleiterplatte
US20030102517A1 (en) * 2001-12-05 2003-06-05 Micron Technology Inc., A Corporation Of Delaware Semiconductor device with electrically coupled spiral inductors
WO2005020254A2 (en) * 2003-08-26 2005-03-03 Philips Intellectual Property & Standards Gmbh Ultra-thin flexible inductor
FR2894061A1 (fr) * 2005-11-30 2007-06-01 Commissariat Energie Atomique Micro-bobine multicouches
US20080061917A1 (en) * 2006-09-12 2008-03-13 Cooper Technologies Company Low profile layered coil and cores for magnetic components
US20080164840A1 (en) * 2007-01-09 2008-07-10 Sony Ericsson Mobile Communications Japan, Inc. Noncontact power-transmission coil, portable terminal, and terminal charging device
EP1965396A1 (de) * 2005-12-07 2008-09-03 Sumida Corporation Flexible spule

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB639591A (en) * 1947-09-08 1950-06-28 Standard Telephones Cables Ltd Improvements in or relating to inductive electrical windings
GB1440304A (en) * 1974-11-29 1976-06-23 Mullard Ltd Transmission line pulse transformers
JPS58212114A (ja) * 1982-06-02 1983-12-09 Showa Electric Wire & Cable Co Ltd コイルの含浸処理方法
US4494100A (en) * 1982-07-12 1985-01-15 Motorola, Inc. Planar inductors
DE8801879U1 (de) * 1988-02-13 1988-04-07 Akyürek, Altan, Dipl.-Ing., Wien Induktivität für Leistungselektronik- bzw. Leistungselektrikanwendungen
EP0428142A2 (de) * 1989-11-15 1991-05-22 The B.F. Goodrich Company Anordnung für flache Spulen
DD290738A5 (de) * 1989-12-22 1991-06-06 Veb Robotron-Messelektronik,"Otto Schoen",De Sende- und/oder empfangsspule aus mehrebenenleiterplatte
US20030102517A1 (en) * 2001-12-05 2003-06-05 Micron Technology Inc., A Corporation Of Delaware Semiconductor device with electrically coupled spiral inductors
US20050099260A1 (en) * 2001-12-05 2005-05-12 Micron Technology, Inc., A Corporation Of Delaware Semiconductor device with electrically coupled spiral inductors
WO2005020254A2 (en) * 2003-08-26 2005-03-03 Philips Intellectual Property & Standards Gmbh Ultra-thin flexible inductor
FR2894061A1 (fr) * 2005-11-30 2007-06-01 Commissariat Energie Atomique Micro-bobine multicouches
EP1965396A1 (de) * 2005-12-07 2008-09-03 Sumida Corporation Flexible spule
US20080061917A1 (en) * 2006-09-12 2008-03-13 Cooper Technologies Company Low profile layered coil and cores for magnetic components
US20080164840A1 (en) * 2007-01-09 2008-07-10 Sony Ericsson Mobile Communications Japan, Inc. Noncontact power-transmission coil, portable terminal, and terminal charging device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20152081A1 (it) * 2015-07-10 2017-01-10 Thereson S P A Procedimento di produzione di un diffusore e corrispondente diffusore
EP3115999A1 (de) * 2015-07-10 2017-01-11 Thereson S.p.A. Herstellungsverfahren eines diffusors und zugehöriger diffusor
WO2019092653A1 (en) * 2017-11-10 2019-05-16 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Induction heater for a cook top
CN111656863A (zh) * 2017-11-10 2020-09-11 I.R.C.A.（共同）股份公司工业铠装及类似电阻 用于炉顶部的感应加热器
CN111656863B (zh) * 2017-11-10 2022-10-14 I.R.C.A.（共同）股份公司工业铠装及类似电阻 用于炉顶部的感应加热器

Also Published As

Publication number Publication date
ES2460923T3 (es) 2014-05-16
ITMI20111036A1 (it) 2012-12-10
PT2533255E (pt) 2014-05-07
EP2533255B1 (de) 2014-01-29

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