WO1994006131A1 - Adjustable-impedance choke coil - Google Patents
Adjustable-impedance choke coil Download PDFInfo
- Publication number
- WO1994006131A1 WO1994006131A1 PCT/EP1993/002052 EP9302052W WO9406131A1 WO 1994006131 A1 WO1994006131 A1 WO 1994006131A1 EP 9302052 W EP9302052 W EP 9302052W WO 9406131 A1 WO9406131 A1 WO 9406131A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaped
- choke coil
- impedance
- sheets
- pair
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
-
- 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
Definitions
- the invention relates to a choke coil according to the preamble of claim 1, the impedance of which can be matched to a predetermined impedance value within certain limits, and a method for adjusting the impedance of the choke coil according to the invention.
- the choke coil according to the invention finds e.g. Use with ballasts for fluorescent tubes. Choke coils with a small space requirement, a high inductance and low losses are required for the application mentioned.
- the choke coil should also be suitable for series production.
- the winding of the inductor is generally surrounded and penetrated by a ferromagnetic core package, which is built up in layers to avoid eddy currents.
- FIGS. 1 to 2 Cross sections through core package profiles of known choke coils are shown in FIGS. 1 to 2.
- FIG. 1 shows a two-part cross-sectional profile of a core package, each layer of the core package being composed of a U-shaped and a T-shaped plate 1, 2.
- the sheets of the core package enclose two winding windows 3 and 4, in which the coil body of the choke coil is arranged.
- the sheets of each layer are held together by means of a clamp 5.
- In the upper area of the core package there is a gap 6 between the U-shaped sheet metal part 1 and the T-shaped sheet metal part 2 arranged, which is filled with a non-ferromagnetic, plastically deformable material.
- a pressure 7 in the area of the gap 6 the width of this gap can be permanently reduced by deforming the core package.
- the impedance of the choke coil can be varied by this measure.
- each layer of the core package being composed of an E-shaped sheet 10 and an I-shaped sheet 11.
- a non-ferromagnetic, plastically deformable material is arranged in the gap 12.
- FIGS. 1 and 2 have in common that the butt joints 13 and 14 are located between the two sheets forming a layer of the core package in the region of a high magnetic flux density of the magnetic field.
- the disadvantage here is that such a butt joint is connected to a stray field, which leads to losses of the choke coil.
- a layer of the core package is composed in three parts from two C-shaped sheets 21, 22 and an I-shaped sheet 23.
- the two C-shaped sheets 21 and 22 enclose the winding window 24 and 25 and the I-shaped sheet 23 and are held together in the lower region by the clamping clip 5.
- a gap 26 filled with a non-ferromagnetic, plastically deformable material could be arranged between one of the ends of the I-shaped plate 23 and the two C-shaped plates 21 and 22.
- the action of pressure in the central area of the laminated core does not lead to permanent deformation of the C-shaped sheets, since these spring back into their initial position after the pressure has released.
- the preamble of claim 1 is known. At the interface between the C-shaped ones
- Sheets and the I-shaped sheet is conical, while the C- shaped sheets have inclined surfaces adapted to the I-shaped sheet.
- a plastically deformable insert made of an insulating material or a metal is arranged in each of the gaps formed between the I-shaped sheet and the two C-shaped sheets.
- the core package is surrounded by a two-part umma to hold the C- and I-shaped sheet metal parts in place.
- an adjustment of the gap width by varying the force exerted by the casing on the filling material when connecting the two parts of the casing during assembly appears to be difficult. It is also questionable whether the described positioning of the sheet metal parts by means of the sheathing holds securely even when exposed to heat.
- the invention is therefore based on the object of providing an impedance-adjustable choke coil with a core package built up in layers from two C-shaped sheets and an I-shaped sheet, and of specifying a method which enables the impedance of the choke coil to be matched to a predeterminable value.
- the object is achieved with regard to the choke coil by the characterizing features of claim 1 and with regard to the method for impedance adjustment by the features of claim 8.
- each layer of the core package being composed of a U-shaped and a T-shaped part
- each layer of the core package being composed of an E-shaped and an I-shaped part
- FIG. 3 shows a cross section through the core package of a choke coil, each layer of the core package being composed of two C-shaped parts and one I-shaped part; 4 shows a cross section through the core package of an embodiment of the choke coil according to the invention;
- 5A and 5B show two embodiments of the locking device of the choke coil according to the invention.
- FIG. 6 shows a schematic arrangement for explaining the method according to the invention for adjusting the impedance of the choke coil according to the invention.
- FIG. 4 shows a cross section through the core package of an embodiment of the choke coil according to the invention.
- the C-shaped ferromagnetic sheets 21 and 22 enclose an I-shaped sheet 23, which is arranged between two winding windows 24 and 25.
- the winding window 24 and 25 serve to receive the coil body, not shown, of the choke coil.
- the two C-shaped sheets of the core package are firmly connected on one side. This one-sided connection is brought about in the exemplary embodiment shown by means of the clasp-like base plate 5.
- the C-shaped sheet metal parts can each have a corresponding groove 32 or 33.
- the clasp-like base plate 5 can serve at the same time for fastening the throttle in a housing, in particular a housing for receiving a fluorescent tube.
- the two C-shaped sheets form a gap 31 between their ends on the side facing away from the fastening clip 5 in their unstressed idle state.
- a further gap 26 can be arranged at least on one side between the I-shaped sheet 23 and the C-shaped sheets 21, 22 in order to facilitate the positioning of the I-shaped sheet in relation to the C-shaped sheets.
- this gap can be filled with a non-ferromagnetic filling material.
- the choke coil according to the invention has a locking device 30 that is essential to the invention at the ends of the C-shaped plates that are separated by an air gap 31.
- the locking device 30 is designed in such a way that the width of the gap 31 can be reduced by the action of a pair of forces 34, 35 on the two C-shaped plates.
- the locking device 30 acts in such a way that after the action of the pair of forces 34, 35 the two C-shaped plates 21, 22 do not spring back into their starting position.
- the impedance of the inductor can be varied.
- the locking device 30 is advantageously nearby the peripheral side of the gap 31 facing away from the I-shaped sheet 23, since the flux density of the magnetic field is particularly low in this area.
- 5A and 5B show embodiments of the locking device 30.
- the end faces 40 and 41 of the two ends 42 and 43 of the C-shaped sheets 21 and 22 have undercuts 44 and 45. Between the undercuts 44 and 45, a filling material 46 is arranged, which bridges the gap 31. If the ends 42 and 43 of the two C-shaped sheets 21 and 22 are pressed against one another, the filler material 46 is deformed in such a way that it shows the hatched areas of the undercuts 44 and 45 which are not penetrated by the filler material 46 before the force begins were filled, increasingly occupies.
- the undercuts become of the filling material 46 after completion of the compression process, ie after the disappearance of the gap 31, just completely filled.
- the cross-sectional area of the filler material 46 has a larger cross section than the opening cross section of the undercuts, so that the corresponding ends of the C-shaped sheets are locked.
- the undercuts 44 and 45 can be designed as circular sectors in the manner shown in FIG. 5A, or they may be trapezoidal in the manner shown in FIG. 5B. However, other embodiments of the undercuts are also conceivable which have a cross section in an inner region which is larger than their opening cross section.
- the filling material can e.g. is a relatively soft metal, such as aluminum or copper.
- the filling material can e.g. be formed as a wire that runs perpendicular to the layer planes of the core package.
- FIG. Figure 6 shows the choke coil according to the invention in supervision, so that the gap 31 is visible in its longitudinal direction.
- the ends 42 and 43 of the C-shaped plates separated by the gap 31 are slowly and continuously pressed together.
- the impedance of the inductor is measured using an electrical impedance measuring method.
- the choke coil is dimensioned so that the choke coil has an impedance which is too low compared to the predetermined value before the C-shaped sheets are pressed together.
- the compression of the C-shaped sheets is ended when the electrical measurement of the impedance of the inductor shows that the impedance of the inductor coincides with the predetermined value.
- the pressing together of the C-shaped sheets and the electrical measurement of the impedance can take place alternately instead of simultaneously.
- the C-shaped sheets can be pressed together homogeneously over the entire length of the choke coil by pressing all the C-shaped sheets of all the layers of the core package together at the same time.
- this procedure is not very sensitive since the width of the gap 31 is simultaneously reduced over the entire length of the inductor.
- the compression of the C-shaped sheets of the core package can advantageously be done by means of two rollers 51, 52 e.g. a roll flanging machine.
- a V-shaped gap 31 is formed between the ends 42 and 43 of the C-shaped sheets. If the layers of the core pact can be displaced relative to one another with a relatively small amount of force, a step-like course of the gap 31 can also result.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Coils Or Transformers For Communication (AREA)
- Discharge Heating (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Regulation Of General Use Transformers (AREA)
- General Induction Heating (AREA)
- Electrotherapy Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59306410T DE59306410D1 (en) | 1992-08-28 | 1993-08-02 | IMPEDANCE ADJUSTABLE THROTTLE COIL |
EP93917720A EP0657063B1 (en) | 1992-08-28 | 1993-08-02 | Adjustable-impedance choke coil |
AU47058/93A AU675238B2 (en) | 1992-08-28 | 1993-08-02 | Adjustable-impedance choke coil |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4228642A DE4228642A1 (en) | 1992-08-28 | 1992-08-28 | Choke impedance adjustment method |
DEP4228642.5 | 1992-08-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994006131A1 true WO1994006131A1 (en) | 1994-03-17 |
Family
ID=6466650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/002052 WO1994006131A1 (en) | 1992-08-28 | 1993-08-02 | Adjustable-impedance choke coil |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0657063B1 (en) |
AT (1) | ATE152854T1 (en) |
AU (1) | AU675238B2 (en) |
DE (2) | DE4228642A1 (en) |
WO (1) | WO1994006131A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907966A (en) * | 1955-05-24 | 1959-10-06 | Gen Electric | Core member for inductive device |
CH482275A (en) * | 1967-10-23 | 1969-11-30 | Leuenberger H | Process for the manufacture of a choke or a transformer |
FR2070783A1 (en) * | 1969-12-09 | 1971-09-17 | Zumtobel Walter | |
FR2188271A1 (en) * | 1972-06-09 | 1974-01-18 | Knobel Elektro App | |
US4238879A (en) * | 1978-08-16 | 1980-12-16 | Howe Charles W | Laminated inductor stacking and calibrating apparatus |
EP0024319A1 (en) * | 1979-08-21 | 1981-03-04 | Schwabe GmbH & Co. KG Elektrotechnische Fabrik | Process for making E-shaped core laminations and I-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps |
DE3008598A1 (en) * | 1980-03-06 | 1981-10-08 | Bruno 8550 Forchheim Waasner | Laminated magnetic core for low inductance choke coil - is divided into two parts including air gap and lacquered joint |
DE8603702U1 (en) * | 1985-02-19 | 1986-04-10 | N.V. Philips' Gloeilampenfabrieken, Eindhoven | Transformer with an air gap |
-
1992
- 1992-08-28 DE DE4228642A patent/DE4228642A1/en not_active Withdrawn
-
1993
- 1993-08-02 AU AU47058/93A patent/AU675238B2/en not_active Ceased
- 1993-08-02 EP EP93917720A patent/EP0657063B1/en not_active Expired - Lifetime
- 1993-08-02 DE DE59306410T patent/DE59306410D1/en not_active Expired - Lifetime
- 1993-08-02 WO PCT/EP1993/002052 patent/WO1994006131A1/en active IP Right Grant
- 1993-08-02 AT AT93917720T patent/ATE152854T1/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907966A (en) * | 1955-05-24 | 1959-10-06 | Gen Electric | Core member for inductive device |
CH482275A (en) * | 1967-10-23 | 1969-11-30 | Leuenberger H | Process for the manufacture of a choke or a transformer |
FR2070783A1 (en) * | 1969-12-09 | 1971-09-17 | Zumtobel Walter | |
FR2188271A1 (en) * | 1972-06-09 | 1974-01-18 | Knobel Elektro App | |
US4238879A (en) * | 1978-08-16 | 1980-12-16 | Howe Charles W | Laminated inductor stacking and calibrating apparatus |
EP0024319A1 (en) * | 1979-08-21 | 1981-03-04 | Schwabe GmbH & Co. KG Elektrotechnische Fabrik | Process for making E-shaped core laminations and I-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps |
DE3008598A1 (en) * | 1980-03-06 | 1981-10-08 | Bruno 8550 Forchheim Waasner | Laminated magnetic core for low inductance choke coil - is divided into two parts including air gap and lacquered joint |
DE8603702U1 (en) * | 1985-02-19 | 1986-04-10 | N.V. Philips' Gloeilampenfabrieken, Eindhoven | Transformer with an air gap |
Also Published As
Publication number | Publication date |
---|---|
EP0657063B1 (en) | 1997-05-07 |
AU675238B2 (en) | 1997-01-30 |
AU4705893A (en) | 1994-03-29 |
ATE152854T1 (en) | 1997-05-15 |
DE4228642A1 (en) | 1994-03-03 |
DE59306410D1 (en) | 1997-06-12 |
EP0657063A1 (en) | 1995-06-14 |
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