US3085162A - Electrical selector circuit arrangements - Google Patents

Electrical selector circuit arrangements Download PDF

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Publication number
US3085162A
US3085162A US855715A US85571559A US3085162A US 3085162 A US3085162 A US 3085162A US 855715 A US855715 A US 855715A US 85571559 A US85571559 A US 85571559A US 3085162 A US3085162 A US 3085162A
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United States
Prior art keywords
current steering
winding
drive
core
current
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Expired - Lifetime
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US855715A
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English (en)
Inventor
Warman Bloomfield James
Deller William Bernard
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ASS ELECT IND WOOLWICH Ltd
ASSOCIATED ELECTRICAL INDUSTRIES (WOOLRICH) Ltd
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ASS ELECT IND WOOLWICH Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/80—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using non-linear magnetic devices; using non-linear dielectric devices
    • H03K17/81—Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors

Definitions

  • Circuits employing electro-magnetic relays or electronic discharge tubes are well known for this purpose.
  • Such arrange ments employ apparatus which is comparatively bulky and requires appreciable power for actuating when employed for purposes such as computers.
  • the main object of the invention is to provide improved apparatus employing miniature components which is capable of high speed operation.
  • a selector switching circuit arrangement comprises a plurality of two-state magnetic cores each controlling an associated load circuit and each core having a set winding, a drive winding and a current steering winding, whereof each of the current steering windings is on one side connected to a current steering terminal and on the other side connected to the emitter of a common base transistor having its collector connected to the associated load and the arrangement being such that it a selected core is set, then, when a pulse is applied to the drive windings the selected core only will be re-set thereby inducing an in its current steering coil which is in the forward direction of the associated transistor emitter base junction and so that the end remote from the emitter base junction will be negative to earth, which end is connected to the current steering coil circuits of the other cores, whereby if a current steering pulse is then applied within the duration of the drive pulse current will flow in the current steering winding of a selected core only and hence in the associated load only.
  • load is intended to include any suitable apparatus which may be current or voltage operated and includes static or dynamic means for supplying information only.
  • terminal is also intended in a broad sense to include any common connection.
  • two-state core implies a magnetic core capable of assuming either one of two stable states of opposite polarity magnetism.
  • An important application of the invention is to a cyclic circuit in which case the cores would be arranged in two groups each with its own drive source and the two drives will be operated alternately so that first a core of one group and then a core of the other group will be successively operated.
  • FIG. 1 shows a selector circuit employing current steering.
  • FIG. 2 shows a cyclic counting circuit employing the same principle.
  • FIG. 3 illustrates graphically the operation of the circuit of FIG. 2.
  • FIG. 4 shows a circuit for applying current steering pulses in the arrangement of FIG. 1 or FIG. 2, and
  • FIG. 5 illustrates graphically the voltage changes which occur in the circuit of FIG. 4.
  • FIG. 1 there are shown three two-state cores A, B and C of the kind having two stable magnetic states of opposite polarity, i.e. a set state and a re-set state.
  • Each of the cores has a set winding a, a current steering winding [1 and a drive winding 0.
  • the set windings a are controlled from a suitable selector arrangement so arranged that the set winding of any selected core may be energised.
  • the current steering windings b of the cores are, at their left hand ends, connected to the current steering terminal and at their right hand ends are connected to the emitters of their associated common base transistors, the collector circuit of which transistors are connected to loads indicated by the references RA, RB and RC respectively. These may either be current actuated or, in some cases, a voltage pulse may be derived from terminals PA, PB or PC, as indicated in dotted lines.
  • the positive end of current steering winding b should be connected to a circuit having a low impedance to earth when passing current and also it should not be effected by conditions in the load circuit.
  • the transistor satisfies these requirements to an appreciable extent.
  • the drive pulse should be applied so as to commence before the current steering pulse so that the E.M.F. across the current steering winding of a selected core is already present when the drive pulse is applied.
  • the external current steering circuit (not shown) includes an appreciable resistance.
  • the selection of the cores may be effected in any suitable manner and there may be either random selection or cyclic selection.
  • FIG. 2 shows the invention applied to a cyclic counting circuit.
  • each of the load circuits is actuated by an associated two state drive core indicated by the references I-VI.
  • Each of the drive cores is shown with a set winding (1, current steering winding b and drive winding 0 whilst in addition there is a priming winding d.
  • the cores are arranged in two groups, the cores I, III and V are arranged in the first group and all their drive windings c are connected to the first Drive 1.
  • the cores II, IV and VI are arranged in a second group and their drive windings c are driven from Drive 2.
  • all the current steering windings are connected to a common drive source, indicated as Drive 3.
  • Drive 3 terminals In the drawing there are two drive 3 terminals shown; this is purely to simplify the drawing and in actual practice both ter minals would be commoned.
  • the developed across winding b of core I will render the transistor T2 conductive and cause current to flow through the set winding a of the core II and at the same time it will apply a pulse to the load circuit R2.
  • the right hand end of the current steering winding b i.e. the positive end
  • the current steering winding b is clamped to earth through a low impedance which is unaffected by the current through the collector circuit and the load R2 and, therefore, a relatively high negative potential can be developed at the left hand which backs off the other current steering windings and prevents current flowing through them when a current pulse from Drive 3 is applied to them.
  • the voltage developed across the winding [2 is independent of the voltage developed across R2 due to current flow through the collector circuit of T2. Hence, the backing off of the other transistors is in no way impaired by the voltage developed across the load circuit R2.
  • This feature is of considerable importance since it ensures accuracy of operation of the circuit and permits appreciable output load signals to be obtained whilst at the same time avoiding faulty operation due to inadequate backing off of the unwanted cores.
  • FIG. 3 shows the sequence of operations graphically and it will be observed that positive pulses are applied to Drive 1 and Drive 2 alternately.
  • the pulses applied to Drive 3 occur simultaneously to Drive 2 pulses.
  • the Drive 3 pulses are shorter in duration than the Cit 2' Drive 1 and Drive 2 pulses and start later and terminate earlier than the Drive 1 and Drive 2 pulses.
  • FIG. 1 Whilst in FIG. 1 there are shown only three load circuits and in FIG. 2 only six load circuits these are by way of example only as clearly there may be any suitable number of load circuits.
  • FIG. 4 shows a circuit for applying the current steering pulses.
  • This circuit essentially comprises a current steering transistor TCS the output of which is connected through a resistor R with the current steering line.
  • FIG. 4 it is intended to show the current steering pulses applied to the circuit of FIG. 1 and the connections to core A only are shown.
  • FIG. 4 is, of course, also applicable to FIG. 2.
  • FIG. 5 shows graphically the voltage changes occurring in the circuit of FIG. 1.
  • a positive going drive pulse is applied; this is effective to reverse the core A and induce an EMF. in the coil 12.
  • a negative going pulse is applied to the base of current steering transistor TCS. This produces a large positive going voltage pulse at the point X and a voltage pulse of reduced amplitude at Y.
  • a small positive going voltage step occurs at time t; and then a large voltage pulse at 1 What we claim is:
  • An electrical selector circuit arrangement comprising a plurality of two-state magnetic cores, an associated load circuit controlled by each core and each core having a set winding, a drive winding and a current steering winding, each of said current steering windings being on one side connected to a current steering terminal and on the other side connected to the emitter of an associated transistor having its base grounded and its collector connected to the associated load, means whereby if a selected core is set, when a pulse is applied to the drive windings the selected core only will be re-set thereby inducing in its current steering coil an EMF.
  • An electric selector circuit arrangement comprising a plurality of two-state magnetic cores arranged in two groups adapted for sequential operation, in a sequence in which cores in one group alternate with cores in the other group, each core having a setting winding, a drive winding and a current steering winding, an associated transistor connected to each of said current steering windings and driving a respective load circuit, a connection between each load circuit and the setting winding of the core in the alternate group next to operate in the sequence, means for applying re-setting currents to all the drive windings of the two groups alternately and means for concurrently applying current steering pulses to all the current steering windings so that a current steering pulse flows only in the current steering winding and associated transistor of a core which is being reset.
  • An electric selector circuit arrangement comprising a plurality of two-state magnetic cores arranged in two groups adapted for sequential operation in a sequence in which cores in one group alternate with cores in the other group, each core having a setting winding, a drive winding and a current steering winding, an associated transistor connected to each of said current steering windings and driving a respective load circuit, a connection between each load circuit and the setting winding of the core in the alternate group next to operate in the sequence, means for applying rc-setting currents to all the drive windings of the two groups alternately and a current steering circuit including a transistor adapted to apply current steering pulses through a resistor to all the current steering windings concurrently with the re-setting current so that a current steering pulse flows only in the current steering winding and associated transistor of a 5 core which is being reset.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electronic Switches (AREA)
  • Control Of Stepping Motors (AREA)
US855715A 1958-11-28 1959-11-27 Electrical selector circuit arrangements Expired - Lifetime US3085162A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38507/58A GB903095A (en) 1958-11-28 1958-11-28 Improvements relating to electrical selector circuit arrangements

Publications (1)

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US3085162A true US3085162A (en) 1963-04-09

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Application Number Title Priority Date Filing Date
US855715A Expired - Lifetime US3085162A (en) 1958-11-28 1959-11-27 Electrical selector circuit arrangements

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US (1) US3085162A (enrdf_load_stackoverflow)
DE (1) DE1152144B (enrdf_load_stackoverflow)
FR (1) FR1241631A (enrdf_load_stackoverflow)
GB (1) GB903095A (enrdf_load_stackoverflow)
NL (1) NL245852A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327296A (en) * 1962-06-11 1967-06-20 Radiation Inc Core memory circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719961A (en) * 1953-11-20 1955-10-04 Bell Telephone Labor Inc Electrical circuit employing magnetic cores
US2719773A (en) * 1953-11-20 1955-10-04 Bell Telephone Labor Inc Electrical circuit employing magnetic cores
US2729807A (en) * 1952-11-20 1956-01-03 Burroughs Corp Gate and memory circuits utilizing magnetic cores
US2923833A (en) * 1955-04-26 1960-02-02 Sperry Rand Corp Selection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729807A (en) * 1952-11-20 1956-01-03 Burroughs Corp Gate and memory circuits utilizing magnetic cores
US2719961A (en) * 1953-11-20 1955-10-04 Bell Telephone Labor Inc Electrical circuit employing magnetic cores
US2719773A (en) * 1953-11-20 1955-10-04 Bell Telephone Labor Inc Electrical circuit employing magnetic cores
US2923833A (en) * 1955-04-26 1960-02-02 Sperry Rand Corp Selection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327296A (en) * 1962-06-11 1967-06-20 Radiation Inc Core memory circuit

Also Published As

Publication number Publication date
NL245852A (enrdf_load_stackoverflow)
DE1152144B (de) 1963-08-01
GB903095A (en) 1962-08-09
FR1241631A (fr) 1960-09-16

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