EP0445704B1 - Schwingdrossel insbesondere zum Betreiben von Metalldampfhochdrucklampen - Google Patents

Schwingdrossel insbesondere zum Betreiben von Metalldampfhochdrucklampen Download PDF

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Publication number
EP0445704B1
EP0445704B1 EP91103237A EP91103237A EP0445704B1 EP 0445704 B1 EP0445704 B1 EP 0445704B1 EP 91103237 A EP91103237 A EP 91103237A EP 91103237 A EP91103237 A EP 91103237A EP 0445704 B1 EP0445704 B1 EP 0445704B1
Authority
EP
European Patent Office
Prior art keywords
core
ferrite
reactor coil
cross
sectional area
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.)
Expired - Lifetime
Application number
EP91103237A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0445704A3 (en
EP0445704A2 (de
Inventor
Paul Dr. Dipl.-Ing. Grohs
Uwe Ing. Grad. Hartmann
Roman Dipl.-Ing. Schichl (Fh)
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.)
Vogt Electronic AG
Original Assignee
Vogt Electronic AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of EP0445704A2 publication Critical patent/EP0445704A2/de
Publication of EP0445704A3 publication Critical patent/EP0445704A3/de
Application granted granted Critical
Publication of EP0445704B1 publication Critical patent/EP0445704B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • the invention relates to an oscillating throttle according to the introductory part of patent claim 1.
  • High-pressure metal vapor lamps require a high voltage to ignite the arc, which can be about 200 times or more the operating voltage.
  • This ignition voltage is generated in a known manner at high frequency by a series resonant circuit from an oscillating choke according to the introductory part of patent claim 1 and an oscillating circuit capacitor, the latter being connected in parallel with the MHD lamp. In the event of resonance, the required ignition voltage is applied to this capacitor.
  • the resonance condition requires that the choke be of high quality in order to safely reach the ignition voltage.
  • this choke since this choke also limits the combustion current in normal operation, it must have a high inductance at the lamp-related, low frequency.
  • the cross-sectional area surrounded by the winding base of the coil former is constant over the length of the air gap and as large as in the area of the field line transition from the air into the ferrite Kerns (see Fig. 1).
  • the subclaims relate to preferred embodiments of the oscillating throttle according to claim 1.
  • FIG. 1 shows the structure of a conventional known oscillating choke.
  • a very large air gap 1 is provided within the winding, which is located on a coil former 2, the surface A of which is surrounded by the winding base 2a has a constant cross section over the length of the air gap 1.
  • the size of the cross section B of the surface 1a at the transition of the magnetic field lines from the air into the ferrite of the core 3 is chosen so that the permissible maximum saturation induction of the ferrite used is not exceeded.
  • the core 3 ' consists of two E-core halves 3a' each with a middle leg 3c 'shorter than the outer legs 3b'.
  • the middle legs 3c 'of the core halves 3a' protrude into a coil former 2 'and leave an air gap 1' between them.
  • the cross-sectional area A enclosed by the winding base 2a 'of the coil former 2' is reduced in the area of the air gap 1 'compared to the cross-sectional area B in the area of the field line exit from the air into the ferrite of the core 3', the latter cross-sectional area B being so large that the associated induction just does not bring the ferrite into saturation.
  • Fig. 3 shows an embodiment of the oscillating throttle according to the invention, in which the shear is increased so that a central leg can be completely dispensed with in the core 3 ′′.
  • the ferrite core 3 ′′ now only consists of a frame that increases the permeability and bundles the outer field lines, as a result of which a magnetic shielding function is achieved.
  • a frame construction as in FIG. 3 can also be used in accordance with FIG. 4 for the realization of an oscillating throttle of the type in FIG. 2.
  • the short middle leg sections 3c 'of the core 3' present in the oscillating choke according to FIG. 2 to increase the permeability are inserted here in addition to the ferrite frame 3 '''as individual pieces 3e''' made of ferrite into the coil former 2 '''.
  • the advantage of the frame construction is that the volume of the coil is reduced by higher core outer legs (Fig. 5) with the same cross-section, and that a good magnetic Shielding is achieved.
  • the shielding effect can be further improved in that the ferrite frame core 3 ′′, 3 ′′ ′′ consists of one piece and thus has no air gap as such.
  • the coil body 2 ', 2' ', 2' '' is expediently constructed in chamber technology, as shown in the drawing.
  • the cross-sectional area enclosed by the bobbin winding base continuously decreases from the ends of the air gap to the center thereof. It is particularly advantageous if the cross-sectional decrease is adapted to the course of the field lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Coils Or Transformers For Communication (AREA)
EP91103237A 1990-03-07 1991-03-04 Schwingdrossel insbesondere zum Betreiben von Metalldampfhochdrucklampen Expired - Lifetime EP0445704B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007148 1990-03-07
DE4007148A DE4007148A1 (de) 1990-03-07 1990-03-07 Volumenoptimierte schwingdrossel fuer hohe aussteuerung und hohe guete

Publications (3)

Publication Number Publication Date
EP0445704A2 EP0445704A2 (de) 1991-09-11
EP0445704A3 EP0445704A3 (en) 1992-08-12
EP0445704B1 true EP0445704B1 (de) 1993-11-03

Family

ID=6401603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91103237A Expired - Lifetime EP0445704B1 (de) 1990-03-07 1991-03-04 Schwingdrossel insbesondere zum Betreiben von Metalldampfhochdrucklampen

Country Status (2)

Country Link
EP (1) EP0445704B1 (enrdf_load_stackoverflow)
DE (2) DE4007148A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010473A1 (de) * 1990-03-31 1991-10-02 Vogt Electronic Ag Drossel-trafokombination zum betreiben von metalldampfhochdruck (mhd)-lampen aus bordnetzen von fahrzeugen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE922423C (de) * 1942-08-21 1955-01-17 Aeg Transformator oder Drosselspule mit im oberen Teil stark abgeflachter Strom-Spannungs-Kennlinie
FR2077445B1 (enrdf_load_stackoverflow) * 1969-04-14 1973-07-13 Ibm France
DE2143037A1 (de) * 1971-08-27 1973-03-01 Joseph Induktives element
US4298853A (en) * 1980-03-27 1981-11-03 General Electric Company Compact high voltage shunt reactor
DE3129381A1 (de) * 1981-07-25 1983-02-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltnetzteil-transformator, insbesondere fuer einen fernsehempfaenger

Also Published As

Publication number Publication date
DE4007148A1 (de) 1991-09-12
EP0445704A3 (en) 1992-08-12
EP0445704A2 (de) 1991-09-11
DE59100540D1 (de) 1993-12-09
DE4007148C2 (enrdf_load_stackoverflow) 1992-07-02

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