WO2009123432A2 - Aligned multiple ferrite beads core anti-crack inductor - Google Patents
Aligned multiple ferrite beads core anti-crack inductor Download PDFInfo
- Publication number
- WO2009123432A2 WO2009123432A2 PCT/MY2008/000022 MY2008000022W WO2009123432A2 WO 2009123432 A2 WO2009123432 A2 WO 2009123432A2 MY 2008000022 W MY2008000022 W MY 2008000022W WO 2009123432 A2 WO2009123432 A2 WO 2009123432A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ferrite
- bobbin
- core
- ferrite beads
- beads core
- Prior art date
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims description 68
- 239000011324 bead Substances 0.000 title claims description 48
- 239000004593 Epoxy Substances 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 10
- 238000005538 encapsulation Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/045—Fixed inductances of the signal type with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
-
- 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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
-
- 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
- H01F41/005—Impregnating or encapsulating
Definitions
- This invention relates to electronic inductive component that transmits radio signal from a device to another device or receives radio signal from another device.
- the transmitter or receiver inductor consist of a piece of ferrite rod core having wire coil wound onto the bobbin and later inserted with ferrite or directly wound onto the ferrite.
- the ferrite core is quite short.
- Such an inductor does not cause problem on electrical devices when the device is drop or incur sudden impact.
- the ferrite rod core is long and small in diameter such as in the case of 4 or 3 millimeters diameter with 30 millimeters length, it could break, easily.
- the inductance value and quality factor to drop and hence the two devices that are designed to communicate at a particular radio frequency would fail to communicate.
- inductor that is able to withstand drop impact. In order to achieve this, it would require a multiple shorter ferrite beads core combined together to form a long ferrite rod. Due to the fact that a lot more force is needed to break a short ferrite rod, the new inductor design would be able to withstand more serious drop impact.
- the unique part of multiple ferrite beads core is that the air gap between the ferrite exist while producing the inductor and it is much more difficult to have impact that create new crack in short ferrite bead.
- inductor is produce base on complete long ferrite rod core; and when it is broken after drop impact, it will cracks resulted in creation of air gap that causes the inductance value to drop.
- Multiple ferrite beads inductor design can be achieved by encapsulating the multiple ferrite beads core with plastic compound or silicon rubber.
- the epoxy encapsulation is only as the purpose of insulation of single ferrite rod. Ferrite rod core can still incur hairline crack if dropped and resulted in reduction of the inductance value of the inductor.
- silicon rubber would be a better choice as it has some flexibility that absorbs some impact force. This will reduce the amount of impact force that is exerted onto the ferrite cores. Due to the fact that the ferrite beads core are already quite short, they would not break easily in most cases. Encapsulation function in this design is mainly for holding together the ferrite beads core; therefore it can be achieved by molding the ferrite beads core with plastic or rubber material or alternatively by heating up shrinkable tube.
- the ferrite beads core may or may not have center hole.
- ferrite beads core may have center hole that allow insertion of a long string of plastic or metal, follow by enlarging the two ends to hold the ferrite beads core together.
- the ferrite beads rod coil is then going through magnetic wire winding process to form an inductor; or by inserting the encapsulated multiple ferrite bead cores into an air coil or bobbin coil. Of cause, it is also possible to directly insert the non-encapsulated multiple ferrite beads core into the air coil or bobbin coil.
- the ferrite bead rod core and the winding coil are then bonded together by epoxy to fix its position.
- Fig. 1 illustrates the insertion of a molded ferrite beads core through an air coil.
- HBl and HB2 are two holes created by centering pins.
- HBl are two holes located diagonally at one end of the molded piece; and
- HB2 are another two holes located diagonally as well at the other end of the molded piece.
- El are bonding epoxy to hole the coil firmly to the ferrite beads cores. It is also possible to bond the coil to encapsulation material but may produces a poor bonding.
- Fig. 2 illustrates the insertion of center linked ferrite beads core through an air coil.
- full length of ferrite rod is exposed; allowing the bonding epoxy (E2) to be applied on the whole circumference of the exposed contact area.
- CP is the centerpiece of plastic or metal material that is inserted through the ferrite beads core. The exposed two ends of the string are enlarge to prevent the ferrite beads from disintegration.
- Fig. 3 illustrates a molded ferrite beads core.
- FBI, FB2 to FBN are ferrite beads up to N pieces of beads.
- FBI are exposed area of ferrite bead number 1
- FB2 are exposed area of ferrite bead number and so on till FBN.
- SHl and SH2 are two holes that exposes the ferrite surface created after molding by molding pins that press together all of the beads to minimize air gap between the beads. JP denotes the joining point of the ferrite beads that air gap may exist.
- Hl, H2, H3, H4, H5 to HN-I are N-I holes multiply by two. This is due to Hl has two holes located diagonally on the circumference of the encapsulation material, similarly H2, H3, H4, H5 until HN-I.
- Fig. 4 illustrates ferrite beads core encapsulated by shrinkable tube (ST).
- FN being N number of ferrite beads whereby first and FN piece of ferrite beads are exposed at two ends.
- Fig. 5 illustrates 2 half bobbin encapsulating the ferrite beads core with epoxy E3 bonding the half bobbin to al of the ferrite beads core and epoxy E4 bonding the two ends of the half bobbins.
- Fig. 6 illustrate full bobbin encapsulating the ferrite beads core with epoxy E5 to bond the bobbin to the cores.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
Description
Descriptions
Title: Aligned Multiple Ferrite Beads Core Anti-Crack Inductor
TECHNICAL FIELD
This invention relates to electronic inductive component that transmits radio signal from a device to another device or receives radio signal from another device.
BACK GROUND ART
At present the transmitter or receiver inductor consist of a piece of ferrite rod core having wire coil wound onto the bobbin and later inserted with ferrite or directly wound onto the ferrite. In most cases, the ferrite core is quite short. Such an inductor does not cause problem on electrical devices when the device is drop or incur sudden impact. But in the case that the ferrite rod core is long and small in diameter such as in the case of 4 or 3 millimeters diameter with 30 millimeters length, it could break, easily. Thus causes the inductance value and quality factor to drop and hence the two devices that are designed to communicate at a particular radio frequency would fail to communicate.
Therefore it is necessary to design an inductor that is able to withstand drop impact. In order to achieve this, it would require a multiple shorter ferrite beads core combined together to form a long ferrite rod. Due to the fact that a lot more force is needed to break a short ferrite rod, the new inductor design would be able to withstand more serious drop impact. The unique part of multiple ferrite beads core is that the air gap between the ferrite exist while producing the inductor and it is much more difficult to have impact that create new crack in short ferrite bead. Not like the long ferrite rod, inductor is produce base on complete long ferrite rod core; and when it is broken after drop impact, it will cracks resulted in creation of air gap that causes the inductance value to drop.
DISCLOSURE OF INVENTION
Multiple ferrite beads inductor design can be achieved by encapsulating the multiple ferrite beads core with plastic compound or silicon rubber. In the past, the epoxy encapsulation is only as the purpose of insulation of single ferrite rod. Ferrite rod core can still incur hairline crack if dropped and resulted in reduction of the inductance value of the inductor.
For encapsulation case, silicon rubber would be a better choice as it has some flexibility that absorbs some impact force. This will reduce the amount of impact force that is exerted onto the ferrite cores. Due to the fact that the ferrite beads core are already quite short, they would not break easily in most cases. Encapsulation function in this design is mainly for holding together the ferrite beads core; therefore it can be achieved by molding the ferrite beads core with plastic or rubber material or alternatively by heating up shrinkable tube.
For molding or shrinkable tube process, the ferrite beads core may or may not have center hole. Alternatively, ferrite beads core may have center hole that allow insertion of a long string of plastic or metal, follow by enlarging the two ends to hold the ferrite beads core together.
The ferrite beads rod coil is then going through magnetic wire winding process to form an inductor; or by inserting the encapsulated multiple ferrite bead cores into an air coil or bobbin coil. Of cause, it is also possible to directly insert the non-encapsulated multiple ferrite beads core into the air coil or bobbin coil. The ferrite bead rod core and the winding coil are then bonded together by epoxy to fix its position.
DESCRIPTION OF DRAWING FOR CARRYING OUT THE DESIGN
Fig. 1 illustrates the insertion of a molded ferrite beads core through an air coil. HBl and HB2 are two holes created by centering pins. HBl are two holes located diagonally at one end of the molded piece; and HB2 are another two holes located diagonally as well at the other end of the molded piece. In order to increase the bonding force, may increase the HBl and HB2 holes to four or six holes each ends. El are bonding epoxy to hole the coil firmly to the ferrite beads cores. It is also possible to bond the coil to encapsulation material but may produces a poor bonding.
Fig. 2 illustrates the insertion of center linked ferrite beads core through an air coil. In this case, full length of ferrite rod is exposed; allowing the bonding epoxy (E2) to be applied on the whole circumference of the exposed contact area. CP is the centerpiece of plastic or metal material that is inserted through the ferrite beads core. The exposed two ends of the string are enlarge to prevent the ferrite beads from disintegration.
Fig. 3 illustrates a molded ferrite beads core. FBI, FB2 to FBN are ferrite beads up to N pieces of beads. FBI are exposed area of ferrite bead number 1, FB2 are exposed area of ferrite bead number and so on till FBN. SHl and SH2 are two holes that exposes the ferrite surface created after molding by molding pins that press together all of the beads to minimize air gap between the beads. JP denotes the joining point of the ferrite beads that air gap may exist. Hl, H2, H3, H4, H5 to HN-I are N-I holes multiply by two. This is due to Hl has two holes located diagonally on the circumference of the encapsulation material, similarly H2, H3, H4, H5 until HN-I.
Fig. 4 illustrates ferrite beads core encapsulated by shrinkable tube (ST). FN being N number of ferrite beads whereby first and FN piece of ferrite beads are exposed at two ends.
Fig. 5 illustrates 2 half bobbin encapsulating the ferrite beads core with epoxy E3 bonding the half bobbin to al of the ferrite beads core and epoxy E4 bonding the two ends of the half bobbins.
Fig. 6 illustrate full bobbin encapsulating the ferrite beads core with epoxy E5 to bond the bobbin to the cores.
Claims
Claims
I Multiple ferrite beads core with or without center hole are aligned at the center of the coil to form a long ferrite rod in the production of an inductor. 2 Aligned multiple ferrite beads core with or without center hole as in claim 1 can be formed by encapsulating together the ferrite beads core in a straight and aligned manner by plastic or rubberized material be it by molding process as in Fig. 1 or heating up shrinkable tube (ST) as Fig. 4.
3 Encapsulation by molding process as in claim 2 can be molding of bobbin with pre- insertion of multiple ferrite beads core in molding tooling during molding process and later the bobbin being wound with magnetic wire to form an inductor.
4 Alternative encapsulation method using bobbin as in claim 3 can be achieved by means of inserting the ferrite beads core into the hole of plastic bobbin and bonding the bobbin to the ferrite cores as in Fig. 6. 5 Final method of encapsulation as in claim 1 can be two pieces of half bobbin covering the multiple beads core and applying epoxy E3 along the two strips of gaps G between the half bobbins and epoxy E4 at the two bobbin ends. These will bond all ferrite beads core to the half bobbins in order to form almost complete full round bobbin with ready ferrite cores attached to the bobbin as in Fig 5. 6 Multiple ferrite beads core with center hole as in claim 1 is aligned in a straight manner by a centerpiece (CP) of plastic or metal material as in Fig. 2
7 The number of aligned ferrite beads core as in claim 2 and 3 being quantity of 2 and above; up to N pieces of ferrite beads core.
8 HB 1 & HB2 quadruple holes spacing at 90 degree around the circumference of the encapsulation as in Fig 1 and Fig. 3 exposes the ferrite cores surface for epoxy El bonding ferrite to the winding coil.
9 SHl, SH2 are 2 side holes and, Hl, H2, H3, H4, H5 to HN-I are copies of quadruple holes created during alignment of each ferrite cores by minimum two pair of diagonally alignment pin on the circumference of the core in the mold tooling during molding process as in Fig. 3.
10 Epoxy compound El of Fig. 1 bond the winding coil to ferrite cores surface of quadruple holes HBl and quadruple holes HB2.
I 1 Epoxy compound E2 of Fig. 2 bonding the winding coil ends to the bear ferrite
12 Epoxy compound E5 bonding bobbin winding coil to the exposed ferrite cores surfaces that are situated at the out most location as Fig. 6.
13 Winding coils as in claim 10 and claim 11 in Fig. 1 and Fig 2 is an air coil or bobbin coil.
14 9HBl, HB2, Hl, H2 to Hn+ 1 as in claim 2 and claim 3 can be in the shape of square, rectangular, triangle, round or ellipse.
15 Ferrite beads core as in claim 1 can be in the shape of short round rod, short ellipse rod, short rectangle rod and short square rod.
16 The two ends aligned ferrite beads core as in Fig. 1, Fig. 2, Fig. 6 and Fig. 6 may be protruding out or hidden inside of the winding coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/MY2008/000022 WO2009123432A2 (en) | 2008-04-01 | 2008-04-01 | Aligned multiple ferrite beads core anti-crack inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/MY2008/000022 WO2009123432A2 (en) | 2008-04-01 | 2008-04-01 | Aligned multiple ferrite beads core anti-crack inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009123432A2 true WO2009123432A2 (en) | 2009-10-08 |
Family
ID=41136043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/MY2008/000022 WO2009123432A2 (en) | 2008-04-01 | 2008-04-01 | Aligned multiple ferrite beads core anti-crack inductor |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2009123432A2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013142066A1 (en) * | 2012-03-20 | 2013-09-26 | Qualcomm Incorporated | Magnetically permeable structures |
| US9431834B2 (en) | 2012-03-20 | 2016-08-30 | Qualcomm Incorporated | Wireless power transfer apparatus and method of manufacture |
| EP3089176A1 (en) | 2016-03-04 | 2016-11-02 | Premo, S.L. | Elongated flexible inductor and elongated flexible low frequency antenna |
| US9583259B2 (en) | 2012-03-20 | 2017-02-28 | Qualcomm Incorporated | Wireless power transfer device and method of manufacture |
| US9653206B2 (en) | 2012-03-20 | 2017-05-16 | Qualcomm Incorporated | Wireless power charging pad and method of construction |
| EP3242301A1 (en) | 2016-05-05 | 2017-11-08 | Premo, S.L. | Device and method for winding a flexible elongated inductor |
| US11569689B2 (en) * | 2018-07-31 | 2023-01-31 | Panasonic Intellectual Property Management Co., Ltd. | Power receiving device, power transmitting device, and underwater power supply system |
-
2008
- 2008-04-01 WO PCT/MY2008/000022 patent/WO2009123432A2/en active Application Filing
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013142066A1 (en) * | 2012-03-20 | 2013-09-26 | Qualcomm Incorporated | Magnetically permeable structures |
| CN104205254A (en) * | 2012-03-20 | 2014-12-10 | 高通股份有限公司 | Magnetically permeable structures |
| US9160205B2 (en) | 2012-03-20 | 2015-10-13 | Qualcomm Incorporated | Magnetically permeable structures |
| US9431834B2 (en) | 2012-03-20 | 2016-08-30 | Qualcomm Incorporated | Wireless power transfer apparatus and method of manufacture |
| US9583259B2 (en) | 2012-03-20 | 2017-02-28 | Qualcomm Incorporated | Wireless power transfer device and method of manufacture |
| US9653206B2 (en) | 2012-03-20 | 2017-05-16 | Qualcomm Incorporated | Wireless power charging pad and method of construction |
| US9972434B2 (en) | 2012-03-20 | 2018-05-15 | Qualcomm Incorporated | Magnetically permeable structures |
| EP3089176A1 (en) | 2016-03-04 | 2016-11-02 | Premo, S.L. | Elongated flexible inductor and elongated flexible low frequency antenna |
| EP3333860A1 (en) | 2016-03-04 | 2018-06-13 | Premo, S.L. | A magnetic core assembly for a flexible elongated inductor and elongated and flexible low-frequency antenna |
| US10056687B2 (en) | 2016-03-04 | 2018-08-21 | Premo, S.L. | Flexible elongated inductor and elongated and flexible low-frequency antenna |
| EP3242301A1 (en) | 2016-05-05 | 2017-11-08 | Premo, S.L. | Device and method for winding a flexible elongated inductor |
| US11569689B2 (en) * | 2018-07-31 | 2023-01-31 | Panasonic Intellectual Property Management Co., Ltd. | Power receiving device, power transmitting device, and underwater power supply system |
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