US3197745A - Magnetic core circuit - Google Patents

Magnetic core circuit Download PDF

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Publication number
US3197745A
US3197745A US22036A US2203660A US3197745A US 3197745 A US3197745 A US 3197745A US 22036 A US22036 A US 22036A US 2203660 A US2203660 A US 2203660A US 3197745 A US3197745 A US 3197745A
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US
United States
Prior art keywords
core
flux
aperture
conductor
minor
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
US22036A
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English (en)
Inventor
Joseph P Sweeney
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.)
TE Connectivity Corp
Original Assignee
AMP Inc
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
Priority to NL263510D priority Critical patent/NL263510A/xx
Application filed by AMP Inc filed Critical AMP Inc
Priority to US22036A priority patent/US3197745A/en
Priority to GB11998/61A priority patent/GB917797A/en
Priority to BE602291A priority patent/BE602291A/fr
Priority to FR858538A priority patent/FR1286298A/fr
Priority to CH435961A priority patent/CH390320A/de
Application granted granted Critical
Publication of US3197745A publication Critical patent/US3197745A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
    • G11C11/08—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using multi-aperture storage elements, e.g. using transfluxors; using plates incorporating several individual multi-aperture storage elements

Definitions

  • This invention relates to an improved memory arrangement using a core of material having square-loop magnetic characteristics, and more particularly a multi-aperture core.
  • An object of this invention is to provide an analog memory device having improved ability to remember and reproduce any one of a number of discrete signal levels.
  • a further object is to provide such a device wherein the read-out is non-destructive but with less chance of false operation than has previously been possible.
  • Still another object is to provide a device of this kind which is simple and inexpensive to build.
  • a multi-aperture magnetic core (also called a MAD) is toroidal in form with a large center aperture and one or more minor apertures through its body.
  • the flux stored in the core which flux is proportional to a given signal level to be remembered, can be read-out or sensed without destroying the information being remembered. This is accomplished by passing an interrogate current through a minor aperture to switch flux locally around it without switching flux around the major aperture.
  • a MAD core is provided with an auxiliary minor aperture, in addition to a read-out aperture, and this auxiliary aperture threaded with a short-circuited conductor.
  • This shorted conductor is to prevent undesired changes in the flux through that portion of the core encircled by the conductor. This, as will be explained shortly, eliminates ambiguity in sensing the stored flux in the core.
  • FIGURE 1 is a diagram of a MAD core analog memory circuit embodying features of the invention
  • FIGURE 2 is a schematic representation of a prior art MAD core illustrating the flux when the core is in its reset or clear state;
  • FIGURE 3 shows the core of FIGURE 2 when it is A set
  • FIGURE 4 shows this core when it is A set
  • FIGURE 5 shows the core of FIGURE 1 embodying the invention when the core is fully set.
  • the analog memory circuit shown in FIGURE 1 comprises a MAD core 12 which is made of a squareloop magnetic ferrite material, such as General Ceramics type number 5209. This core has a central or major aperture 14, a minor read-out aperture 16 and a minor auxiliary aperture 18. Each minor aperture, for the core shown, is placed midway between the inner and outer edges of the body of the core so that substantially equal flux passes through the portions of the core on each side of the aperture.
  • the central aperture of core 12 is threaded by a clear winding 20 and by a set winding 22, each of which is adapted to be energized at appropriate times by a respective current having approximately the waveform indicated.
  • the amplitude of the clear current is made sufilcient so that at the end of this current the core will be left saturated with flux oriented, for example, in the clockwise direction. This will be called the clear or reset state of the core.
  • a momentary set current is applied to winding 22 to reverse part of the previous flux, the magnitude of the set current determining what fraction of the flux will be reversed.
  • the core can be set with some flux oriented in the counter-clockwise direction, the amount of the set flux being proportional to a signal level to be remembered.
  • the maximum amount of flux which can be set in the counterclockwise direction in this circuit is /2 of the total clear flux.
  • read-out aperture 16 is provided with an interrogate winding 24, which is adapted to be energized by an alternating current of sufficient amplitude to switch the flux, if any is switchable, locally around aperture 1 6. Any flux which is so switched induces in an output winding 26 a corresponding alternating voltage proportional to the flux being switched back and forth around aperture 16.
  • the amount of flux switchable around aperture 16 by the interrogate current is determined by the amount of flux set in the counter-clockwise direction.
  • Auxiliary minor aperture 18 of core 12 is threaded by a shorted conductor 28 encircling the outer leg 29 of the core.
  • the efl'ect of this conductor is to eliminate ambiguities in reading-out the flux stored in the core.
  • the electrical and magnetic action of conductor 28 will be understood more fully in connection with FIGURES 2-5.
  • FIGURE 2 shows a conventional MAD core 30 with its flux in the reset condition as indicated by the arrows 32.
  • this condition normally it is impossible to set any flux locally around the minor aperture 34, corresponding to aperture 16 of core 12, since the fluxes on each side of this aperture are in the same direction.
  • FIGURE 3 shows core 30 in its A set condition.
  • An interrogate current through minor aperture 34 can therefore reverse one unit of flux.
  • this same result is obtained for the core in its set state as shown in FIGURE 4.
  • three counter-clockwise or set units of flux 36 and one reset unit 32 nonetheless the same amount of flux, one unit, can be reversed around the minor aperture 34.
  • the read-out signal obtained for the set condition will be the same as for the A set condition. This is intolerable in a true analog memory.
  • FIGURE 5 shows core 12 in its fully set condition and illustrates how the invention prevents ambiguity in readout.
  • Core 12 in addition to read-out aperture 16, has auxiliary minor aperture 18 which is threaded by shortcircuited conductor 28.
  • auxiliary minor aperture 18 which is threaded by shortcircuited conductor 28.
  • conductor 28 Since, conductor 28 has at least some resistance, it is possible under long term conditions to cause the flux in leg 2E to change. However, it is assumed that the set current has far too short a duration to do this. On the other hand, a long duration reset current can be used to advantage in this circuit to insure that all of the flux in leg 29 is returned to or maintained in reset condition.
  • An improved magnetic core memory comprising: a toroidal core of magnetic material and having a first minor aperture and a second minor aperture, conductor means threading said first minor aperture to inhibit switching of flux in a portion of said core, means to set the flux in said core to a desired level, means to reset the fiux in said core to a cleared condition, means threading said second minor aperture to switch flux locally thereabout, and means threading said second minor aperture to sense the flux stored in said core.
  • An improved magnetic core memory circuit comprising: a toroidal core of magnetic material, said core having at least two minor apertures through it, read-out winding means threading one of said minor apertures, set Winding means on said core for setting the flux therein to a desired value, clear Winding means on said core for resetting the flux therein, a low-resistance conductor means threading the other of said minor apertures and encircling a portion only of said core, the said read-out winding means further including a first conductor adapted to be energized by an alternating current, and a second conductor coupled to the first conductor by magnetic flux in said core.
  • a magnetic core circuit comprising a toroidal magnetic core having a major and two minor apertures, a short-circuited conductor having a given resistance threading one of said minor apertures, read-out winding means coupled to the other of said minor apertures, first current pulse means to set said core with flux in one direction, and second current means to reset said core with flux in the other direction, an interrogate winding threading the said other of said minor apertures to switch flux locally thereabout to provide an output signal on said read-out winding means, the said short-circuited conductor serving to limit the flux set in the one direction to substantially half the flux capacity of the magnetic core.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Protection Of Transformers (AREA)
US22036A 1960-04-13 1960-04-13 Magnetic core circuit Expired - Lifetime US3197745A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL263510D NL263510A (enrdf_load_stackoverflow) 1960-04-13
US22036A US3197745A (en) 1960-04-13 1960-04-13 Magnetic core circuit
GB11998/61A GB917797A (en) 1960-04-13 1961-04-04 Improvements in or relating to magnetic core memory devices
BE602291A BE602291A (fr) 1960-04-13 1961-04-06 Dispositif à mémoire.
FR858538A FR1286298A (fr) 1960-04-13 1961-04-12 Dispositif à mémoire
CH435961A CH390320A (de) 1960-04-13 1961-04-13 Speicheranordnung mit magnetischem Kern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22036A US3197745A (en) 1960-04-13 1960-04-13 Magnetic core circuit

Publications (1)

Publication Number Publication Date
US3197745A true US3197745A (en) 1965-07-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
US22036A Expired - Lifetime US3197745A (en) 1960-04-13 1960-04-13 Magnetic core circuit

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US (1) US3197745A (enrdf_load_stackoverflow)
BE (1) BE602291A (enrdf_load_stackoverflow)
CH (1) CH390320A (enrdf_load_stackoverflow)
GB (1) GB917797A (enrdf_load_stackoverflow)
NL (1) NL263510A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289185A (en) * 1961-10-12 1966-11-29 Amp Inc Magnetic switch circuit
US3315239A (en) * 1963-05-24 1967-04-18 Gen Signal Corp Multiaperture core incremental pulse counter
US3328784A (en) * 1963-01-04 1967-06-27 Amp Inc Magnetic core read-out means
US3376427A (en) * 1961-01-30 1968-04-02 American Mach & Foundry Transfluxor magnetic switch

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2284406A (en) * 1940-03-01 1942-05-26 Gen Electric Transformer
US2939117A (en) * 1956-06-26 1960-05-31 Ibm Magnetic core storage device with flux controlling auxiliary windings
US3077582A (en) * 1956-08-22 1963-02-12 Ibm Magnetic core logical device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2284406A (en) * 1940-03-01 1942-05-26 Gen Electric Transformer
US2939117A (en) * 1956-06-26 1960-05-31 Ibm Magnetic core storage device with flux controlling auxiliary windings
US3077582A (en) * 1956-08-22 1963-02-12 Ibm Magnetic core logical device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376427A (en) * 1961-01-30 1968-04-02 American Mach & Foundry Transfluxor magnetic switch
US3289185A (en) * 1961-10-12 1966-11-29 Amp Inc Magnetic switch circuit
US3328784A (en) * 1963-01-04 1967-06-27 Amp Inc Magnetic core read-out means
US3315239A (en) * 1963-05-24 1967-04-18 Gen Signal Corp Multiaperture core incremental pulse counter

Also Published As

Publication number Publication date
NL263510A (enrdf_load_stackoverflow)
GB917797A (en) 1963-02-06
CH390320A (de) 1965-04-15
BE602291A (fr) 1961-10-31

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