US2247983A - Amplifying apparatus - Google Patents

Amplifying apparatus Download PDF

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Publication number
US2247983A
US2247983A US32263540A US2247983A US 2247983 A US2247983 A US 2247983A US 32263540 A US32263540 A US 32263540A US 2247983 A US2247983 A US 2247983A
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core
winding
windings
current
coils
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English (en)
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Barth Gustav
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Siemens APP und Maschinen GmbH
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Siemens APP und Maschinen GmbH
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F9/00—Magnetic amplifiers
    • H03F9/04—Magnetic amplifiers voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F9/00—Magnetic amplifiers
    • H03F9/02—Magnetic amplifiers current-controlled, i.e. the load current flowing in both directions through a main coil

Definitions

  • This invention relates to amplifying apparatus, and more particularly to means for amplifying anelectric current.
  • One of the objects of the present invention is to provide novel means which are especially adapted for use in aircraft navigational apparatus for amplifying an electric current.
  • Another object of theinvention is to provide novel means for governing a movable member, such as a control surface of an aircraft.
  • a further object is to provide a novel apparatus of the above character which is inexpensive to manufactiue, light in weight, and which occupies a small amount of space.
  • An additional object is to provide novel current amplifying apparatus which can .be used with direction responsive devices on board aircraft.
  • a ⁇ further object is to provide a novel electric current amplifying device which is .adapted for reversibly controlling a movable member by an output current having the same value for an input current having opposite signs.
  • Fig. 1 is a schematic illustration of an amplier apparatus necessary for an explanation of the present invention
  • Fig. 2 is a diagram of the characteristic curves of the device shown in Fig. 1;
  • Fig. 3 is a schematic illustration of another ampliner apparatus 'which is employed for the same purpose as the apparatus of Fig. 1;
  • Fig. i is a schematic illustration of one embodiment of the -present invention.
  • Fig. 5 is an illustration ofthe characteristic curves of the embodiment of Fig. 4;
  • Fig. d is a schematic illustration of a second embodiment of the invention
  • Fig. '7 is a partial schematic illustration of means, which, in combination with part of the embodiment of Fig. 6, comprise a third embodiment of the invention
  • Fig. Si a schematic detail View of a coil circuit which can be employed with the embodiment of Fig. 6;
  • Fig. 9 is another detail view of another coil circuit which can be employed with the embodiment of Fig. 6.
  • An output circuit is associated with each of said units, and each of said circuits includes a plurality of output coils through which flows an alternating current.
  • means are provided for giving an unsymmetrical form tothe characteristic curve of each unit.
  • the latter means comprise a rectier in each of the output circuits and a counter-coupling coil upon each core element.
  • the rectified alternating current in the output circuit of one element is conducted to the counter-coupling coil mounted upon the other element, and means are provided for conducting the rectified current in the remaining output circuit to the counter-coupling coil upon the remaining element.
  • Figs. 1 and 3 The apparatus shown in Figs. 1 and 3 is introduced for purposes of illustrating the operating principle of the invention set forth in the above mentioned copending applications. This principle is: based upon the fact that the inductance of suitable Coils upon a magnetic core can be varied by controlling the permeability of the core. Suitable means are provided for controlling this permeability in accordance with a control force of a controlling instrument.
  • a core element l0 is employed having similar members ⁇ Il and l2, which are of a highly permeable substance, such as iron-nickel alloy.
  • the members Il and I2 are, for example, of a rectangular or closed form.
  • An input circuit is provided for element I0 having an input coil IS, which is common to members II and I2, and which is electrically connected to a control instruinent I, which governs, by suitable means (not shown), a flow of direct current to the coil I3.
  • a control instruinent I which governs, by suitable means (not shown), a flow of direct current to the coil I3.
  • Coils i5 and I@ are in series with one another and with a rectiiier IS to which is operatively connected a suitable consuming device, such as an electric servomotcr I9, the latter being operatively associated with a movable member 2S.
  • the motor I9 is preferably controllable by a rotary magnet relay device (not shown).
  • the rectifier I8 transforms the current in the output circuit into a direct ciurent
  • the magnitude of the direct current J1, which controls motor I9, is a function of the magnitude of this alternating current and is dependent upon the reactance of said coils.
  • This reactance is a function of the permeability of the core element I which corresponds to the working point of the magnetization characteristic curve or the device.
  • an input direct current ie which flows in the coil I3, creates a constant magnetic flux in the members II and I2, thus displacing the Working point of the magnetization characteristic curve.
  • the direct current J1 which controls motor I9, is consequently a function of the input current ie.
  • a characteristic curve for a device of this character which illustrates that the output current J1 is a function of the input current ie, the latter current being plotted against J1 in a conventional manner.
  • the output current J1 ascends from a value of zero in approximately a straight line when ie is positive. However, J1 reaches a limit value when the input current has increased a predetermined amount. If the input current ie ows in coil I3 in an opposite direction, that is, when ie becomes negative, the same value for J1 is obtained.
  • a corresponding characteristic curve as shown by the dotted line, is formed upon the opposite side of the vertical axis of the diagram of Fig. 2.
  • Both of the characteristic curves including the one shown by a full line and the one shown by a dotted line, are completely symmetrical With reference to the axis of ordinates. Consequently, the direction of ie is of no importance in determining the magnitude of J1.
  • the consuming device which is electrically connected to rectifier I8, comprises a conventional rotary magnet
  • the latter can operate only in one direction because the output direct current J1 can ow in the rotary magnet in one direction only.
  • the direction of rotation cannot be aiected.
  • the structure shown in this Figure is analogous to that appearing in Fig. 1, with the exception that a regenerator coil 2
  • the direct current iiowing in coil 2I is to displace the axis of the ordinates.
  • thus accomplishes a premagnetizati'on which, in Fig. 3, is indicated symbolically by the arrow 23.
  • the direct current owing in coil 2I is preferably of such a value that when ie equals zero, the axis of the ordinates intersects the full line curve at approximately the mid-point thereof. The intersection is shown at point P of Fig. 2.
  • the output current corresponding to this point of intersection is J p.
  • a rotary magnet 24 is operatively connected to rectifier I8 of Fig. 3, a coil 25 which acts upon a movable pointer, or arm 26, being electrically connected to the rectifier.
  • a movable pointer or arm 26 being electrically connected to the rectifier.
  • a counter torque must be exerted thereupon which, in the structure o! Fig. 3, is exerted by a coil 21 which is electrically connected to a suitable source of direct current for this purpose.
  • the apparatus shown in Fig. 3 however, has a number of defects.
  • a permanent and a constant premagnetization which makes it necessary to conduct a vconstant direct current to the coil 2l.
  • This requires either a constant current source or as the premagnetization current is derived from the current source II, as shown in Fig. 3, there must be provided means which will regulate that current source to produce a constant potential or to provide means for compensating for potential fluctuations.
  • the consuming apparatus 24 must therefore be much larger and heavier than it would be if no compensating torque were required.
  • a double unit apparatus is provided, each unit being partially analogous to that shown in Fig. 1.
  • the units are electrically associated in such a manner that only one thereof is materially activ-e or effective at any one time.
  • One unit is adapted for moving a consuming device, such as a relay, in one di-rection, whereas the other unit is adapted for moving the device in an opposite direction.
  • FIG. 4 One embodiment of the present invention which :avoids the above defects by employing a double unit amplifier' is illustrated schematically in Fig. 4 in which the members I0, I0', II, II', I2, I2', I3, I3', I5, I5', I6 and I6' correspond to the ⁇ same members shown in Fig. 1.
  • the output circuits of both units are fed preferably from the same alternating current source I'I'.
  • the direct current ie for energizing the input circuits of units I and II is controlled by an instrument, such as a gyro compass 29.
  • the coils I3, I3' of .the input circuits are in this embodiment connected in series.
  • a countercoupling coil 33 is mounted upon the core element of unit I in a manner analogous to input coil I3.
  • a counter-coupling coil is mounted in a similar manner upon core element II.
  • the coils 30 and 30' are respectively energized by currents Ji and J3. of a rectifier IB' in the output circuit of unit II,
  • rectifier I8 in the output circuit of unit I.
  • a suitable consumer device is -operatively connected to the apparatus comprising, for example, a relay analogous to member 24 of Fig. 3.
  • Relay 35 is provided with a movable arm 36 which is governed by opposing coils 31 and 38. The latter coils are respectively connected in the leads 34 and 32.
  • the terminals of lthe apparatus to which member 35 is connected comprise terminals d and d on opposite sides of coil 31, and terminals b and c on opposite ⁇ sides of coilA 38.
  • a second stage of an amplier device can be connected to these terminals in place of member 35 in a manner to appear later.
  • Movable arm 33 can control, for example, the direction :of a current to a servo-motor (n-ot shown) which can be operatively connected to a movable member, such as a control surface of an aircraft (also not shown).
  • the direction of direct currents Ja, J4 are determined by the direction of rectiiiers I8, I8', respectively, for example, as indicated by arrows in leads 34 and 32. If the input current ie controlled by instrument 29 iiows inthe direction indicated by a single arrow 39 in the leads of the input circuit, there are created by means of coils I3, I3' constant magnetic fluxes in members I0 and I il', which are indicated diagrammatically by arrows 40, 42', respectively. The currents in the counter-coupling coils 30, 30 create fluxes which are respectively indicated by arrows 4I, 4 I
  • the eiiect of the countercoupling coil is substantially to neutralize the electrical influence of an input coil of one unit and to intensify this iniiuence in the other unit when the input current flows in a given direction.
  • the units I and II are similar and are constituted by the same substance. Consequently, as in Fig. 5, the characteristic curve of each unit is analogous to that of the other and the curves intersect one another at the axis of ordinates, thereby causing relay 35 to respond symmetrically for equal and opposite values of ie.
  • This is a special advantage as compared with the embodiment of Fig. 3 because, as shown in Fig. 2, it is impossible to have a characteristic curve having the same form on opposite sides of the Working point P.
  • FIG. 6 An embodiment wherein an added coil is mounted upon each element is illustrated in Fig. 6. This embodiment is similar in all respects to that of Fig. 4 with the exception (l) that input coils I3, I3 are connected in parallel instead of in series, and (2) that regenerator coils 43 and 43 are respectively mounted upon core elements I0 and I3' in a manner similar to input coils i3 and i3.
  • Coil 43 is connected in lead 33 and is energized by current from rectifier I8 in the output circuit of its own unit.
  • Coil 43 is connected in lead 3l and is analogously energized by current from rectifier I8.
  • the fluxes of the regenerator coils 43, 43 support the action of the iiuxes of countercoupling coils 30, 35', respectively.
  • regenerator and counter-coupling coils of Fig. 6 are in series; however, these coils can be connected in parallel as shown in Figs. 8 and 9, each of which illustrates said coils for one unit only.
  • the circuits of Figs. 8 and 9 are similar with the exception that in the former, coil 31 is interposed between one extremity of each of coils 43 and 30', whereas in the latter coil 31 is between coil 43 and rectiiier I 8.
  • the amplifier apparatus above described in connection with Fig. 6 can be employed as an input stage of a multi-stage amplifier provided member 35 is disconnected therefrom at terminals a, b, c, d and, for example, a second amplier stage is connected thereto.
  • a second ampliiier stage is illustrated in Fig. '1 which comprises units I and II', the former having input coils 44, 45, the latter having input coils 4B, 41.
  • coils 44 and 46 are in series in a lead 48 connected at terminals a and d.
  • Coils 45 and 41 are in series in a lead 49.
  • the two units I and II' are analogous to units I and II, with the exception of the input coils. Portions of units I and II have been omitted for clarity.
  • the rectied current provided by rectifier I8 flows through coils 44, 46, and the rectified current from rectifier I8 is conducted through coils 45, 41.
  • Magnetic fluxes are created by these currents which are indicated diagrammatically in Fig. 7 by arrows 5D, 5I for coils 44, 45, and by arrows 52, 53 for coils 45, 41, respectively. positely directed as are those of the second pair.
  • the means are extremely light in weight, inexpensive to manufacture, and are therefore well adapted for use aboard vehicles, such as aircraft.
  • the apparatus enables instruments such as the above mentioned compass, which can exert only a very small torque, to govern accurately the control surface of an aircraft.
  • Amagnetic amplifier comprising a iirst magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first wind ing and a second winding in series opposed relation, a source of alternating current connected to energize the iirst and second windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, the third winding of one core being connected in aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a pair of rectiiiers, a Iirst output circuit including the rst and second windings of the first core, the fourth winding of the second core and one of said rectiiiers, whereby the alternating current in the first and second windings of the iirst core is
  • a magnetic amplifier comprising a first magnetizable core carrying a rst winding and a second winding connected in series opposed relation, a second magnetzable core carrying a nist winding and a second winding in series opposed relation, a source of alternating current connected to energize the first and second windings on each of said two cores, a direct current input circuit including a third winding on said iirst core and a third winding on said second core, said third windings being connected in series aiding relation, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first and second windings of the iirst core, the fourth winding of the second core and one of said rectifiers, whereby the alternating current in the first and second windings of the first core is rectified and then caused to flow in the fourth winding of the second core, a second output circuit including the iir
  • a magnetic amplifier comprising a magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first winding and a second Winding in series opposed ree lation, a source of alternating current connected to energize the first and second windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, said third windings being connected in parallel and in aiding relation, a fourth winding on said first core and a fourth winding on said second core, said fourthy windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first and second windings of the first core, the fourth winding of the second core and one of said rectifiers, whereby the alternating current in the first and second windings of the first core is rectified and then caused to fiow in the fourth winding of the second core, a second output circuit including the first and second windings of the second core,
  • a magnetic amplifier comprising a first magnetizable core lcarrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first winding and a second winding in series opposed relation, a source of alternating current connected to energize the first and second windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding' on said second core, the Ithird winding of one core being connected in aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first and second windings of the first core, the fourth winding of the second core and one of said rectifiers, whereby the alternating current in the first and second windings of the first core is rectified and then caused to flow as a direct current in the fourth winding of the second core, a second output
  • a magnetic amplifier comprising a first magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first rwinding and a second winding in series opposed relation, a source of alternating current connected to energize the first and second windings on each of said two cores, a direct current input circuit including a third winding von said first coreandy athird winding on said secon-d core, said third windings being connected in series aiding relation, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, apair of rectiers, a first output circuit including the first and second windings of the first core, the fourth winding of the second core and one of lsaid rectifiers, whereby the alternating current in the first and second windings of the first core is rectified and then caused to fiow in the fourth winding of the second core,
  • a second-output circuit including the first and* second windings of the second core, the fourth winding of thel first core and the other of said rectifiers, whereby the alternating current in the first and second windings of the second core is rectified and then caused to flowv in the fourth winding of the first core, and a consuming ldevice having two windings one of which is connected to be energized by one output circuit and the other of which is connected to be energized by the other output circuit.
  • a magnetic amplifier comprising a magnet izable core carrying a, first winding and a second winding connected in series opposed relation7 a second magnetizablek core carrying a first winding and a second winding in series opposed relation, a source of alternating current connected to energize the first Iand second windings on each of said two cores,la :direct current input circuit including a third Winding on said first core and a third winding on said second core, said third windings bei-ng connected in parallel and in aiding relation, a fourth winding on saidy first core anda fourth winding on said second core, said fourth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first and second windings of the first core, the fourthfwinding ofthe second core and one of said rectiflers, whereby the alternating current in the first and second windings of the first core is rectified and then caused to fiow in the fourth winding of the second core, a second output circuit including the firstand second windings4
  • a magnetic amplifier comprising a first magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first winding and a second winding in series opposed relation, a source of alternating current connected to energize the first and second windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, the third winding of one core being connected in series aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a fifth winding on said first-l core and a fifth winding on said second core, said fifth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first, second and fifth windings of the first core, the fourth Winding of the second core and one of said rectifiers, whereby the alternating current in the first and second windings of
  • a magnetic amplifier comprising a first magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first Winding and a second winding in series opposed relation.
  • a source of alternating current connected to energize the first and second windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, the third winding of one core being connected in parallel aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a fifth winding on said first core and a fifth winding on said second core, said fifth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first, second and fifth windings of the first core, the fourth Winding of the second core and one of said rectifiers, whereby the alternating current in the first and second windings of
  • a magnetic amplifier comprising a first magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first winding and a second winding in series opposed relation, a source of alternating current connected to energize the rst and second windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, the third winding of one core being connected in aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a fifth winding on said first core and a fifth winding on said second core, said fifth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first, second and fth windings of the first core, the fourth winding of the second core and one of said rectifiers, whereby the alternating current in the first and second winding
  • a magnetic amplifier comprising a first magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first winding and a second winding in series opposed relation, a source of alternating current connected to energize the first and second Windings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, the third winding of one core being connected in series aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a fifth winding on said first core and a fth winding on said second core, said fifth windings being wound in opposed relation, a pair of rectifiers, a first output circuit including the first, second and fifth windings of the first core, the fourth winding of the second core and one of said rectifiers, whereby the alternating current in the first and second winding
  • a magnetic amplifier comprising a first magnetizable core carrying a first winding and a second winding connected in series opposed relation, a second magnetizable core carrying a first winding and a second winding in series opposed relation, a source of alternating current connected to energize the first and second windf ings on each of said two cores, a direct current input circuit including a third winding on said first core and a third winding on said second core, the third winding of one core being connected in parallel aiding relation with the third winding of the other core, a fourth winding on said first core and a fourth winding on said second core, said fourth windings being wound in opposed relation, a fifth winding on said first core and a fth winding on said second core, said fifth windings being wound in opposed relation, a pair of rectiners, a first output circuit including the first, second and fifth windings of the first core, the fourth winding of the second core and one of said rectifiers, whereby the alternating current in the first and second

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnets (AREA)
US32263540 1938-12-24 1940-03-06 Amplifying apparatus Expired - Lifetime US2247983A (en)

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Application Number Priority Date Filing Date Title
DE213340X 1938-12-24

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US (1) US2247983A (fr)
CH (1) CH213340A (fr)
FR (1) FR870759A (fr)
NL (2) NL95683B (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444726A (en) * 1944-02-05 1948-07-06 Bristol Company Method and apparatus for determining the magnitude of a condition
US2453470A (en) * 1945-12-07 1948-11-09 Ward Leonard Electric Co Electric controlling apparatus
US2503039A (en) * 1945-09-17 1950-04-04 Askania Regulator Co Electrical control circuit employing magnetic amplification
US2552952A (en) * 1948-03-12 1951-05-15 Yves Rocard Magnetic amplifier
US2567383A (en) * 1946-03-28 1951-09-11 Asea Ab Means for generating low-frequency electrical oscillations
US2585332A (en) * 1948-02-10 1952-02-12 Vickers Inc Electric controlling apparatus
US2678419A (en) * 1946-09-30 1954-05-11 Bendix Aviat Corp Saturable transformer device
US2697813A (en) * 1951-04-12 1954-12-21 Warren Webster & Co Magnetic amplifier system
US2861240A (en) * 1954-07-30 1958-11-18 Honeywell Regulator Co Magnetic amplifiers
US2915690A (en) * 1954-07-29 1959-12-01 Raytheon Co Magnetic amplifier electric motor control
US3116440A (en) * 1957-06-17 1963-12-31 Allis Chalmers Mfg Co Circuit breaker control employing saturable reactors
US3258654A (en) * 1966-06-28 Electrical current sensing means
US3488601A (en) * 1967-08-28 1970-01-06 Moisei Aronovich Rosenblat Reversible magnetic amplifier
US3936721A (en) * 1972-11-16 1976-02-03 Weir Electronics Limited Electrical power supplies

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966572C (de) * 1941-10-31 1957-08-22 Siemens Ag Magnetischer Verstaerker

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258654A (en) * 1966-06-28 Electrical current sensing means
US2444726A (en) * 1944-02-05 1948-07-06 Bristol Company Method and apparatus for determining the magnitude of a condition
US2503039A (en) * 1945-09-17 1950-04-04 Askania Regulator Co Electrical control circuit employing magnetic amplification
US2453470A (en) * 1945-12-07 1948-11-09 Ward Leonard Electric Co Electric controlling apparatus
US2567383A (en) * 1946-03-28 1951-09-11 Asea Ab Means for generating low-frequency electrical oscillations
US2678419A (en) * 1946-09-30 1954-05-11 Bendix Aviat Corp Saturable transformer device
US2585332A (en) * 1948-02-10 1952-02-12 Vickers Inc Electric controlling apparatus
US2552952A (en) * 1948-03-12 1951-05-15 Yves Rocard Magnetic amplifier
US2697813A (en) * 1951-04-12 1954-12-21 Warren Webster & Co Magnetic amplifier system
US2915690A (en) * 1954-07-29 1959-12-01 Raytheon Co Magnetic amplifier electric motor control
US2861240A (en) * 1954-07-30 1958-11-18 Honeywell Regulator Co Magnetic amplifiers
US3116440A (en) * 1957-06-17 1963-12-31 Allis Chalmers Mfg Co Circuit breaker control employing saturable reactors
US3488601A (en) * 1967-08-28 1970-01-06 Moisei Aronovich Rosenblat Reversible magnetic amplifier
US3936721A (en) * 1972-11-16 1976-02-03 Weir Electronics Limited Electrical power supplies

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Publication number Publication date
FR870759A (fr) 1942-03-24
NL95683B (fr) 1900-01-01
NL57679C (fr) 1900-01-01
CH213340A (de) 1941-01-31

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