DE2234550A1 - CIRCUIT ARRANGEMENT FOR GENERATING A CIRCULATING MAGNETIC FIELD - Google Patents

Description

Western Electric Company Hess. ' 1-1

Incorporated

new York

Circuit arrangement for generating a rotating magnetic field

The invention relates to a circuit arrangement for generating of a rotating magnetic field, with a serial connection air comprising a capacitor and at least one coil, a first oscillator, which develops a binary control signal Signal source and a power source that pre-charges the capacitor, when a binSres control signal is in a first binary state pending.

A single-walled magnetic don & ne is an inversely polarized magnetic district in one. Material layer. The domain is delimited by a single, self-contained wall forming, for example, a cylinder geometry, its diameter being a function of the material layer in which it is present. Since the domain boundary is stable and does not intersect the edge of the host material layer, a selective multidimensional movement of the domain within the layer can be realized.

The movement of a single-walled domain is typically caused by an attractive, local magnetic field at a position opposite the one occupied by the domain

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Location is generated. The domain moves depending on the magnetic field to the point of the attractive magnetic field.

A more complete discussion of single-walled domains, various ones that take advantage of the motion of single-walled domains Operations and a material suitable for the transfer of single-walled domains can be found in the article "Properties and Device Applications of Magnetic Domains in Orthoferrites "by A. H. Bobeck in Bell System Technical Journal, Volume 46, No. 8, October 1967, page 1901 ff.

With this basic concept as a starting point, a large number of of magnetic domain devices for performing logical, arithmetic and information storage functions developed. These facilities provide a simple, reliable method of transferring the domains in the material layer depending on external control stimuli or excitations.

For this purpose, many circuit arrangements have been made for transmission magnetic domains developed, in the case of thins the domains from predetermined locations to adjacent locations in a material layer depending on a cycle of one in the Layer plane circumferential magnetic field transferred wu? Dci .. The Control of the phase characteristics of the rotating field table allows these circuits to align domains when switching on and interrupting the field. It It is therefore essential that the phase with each revolution of the magnetic field is controlled so far that the field bfi a predetermined

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Phase put into effect and after any exact number
can be interrupted by full rounds. An embodiment of these transmission circuits, for a circumferential field and for the type of transmission of domains in a material layer in connection with a transmission circuit is described in US Pat. No. 3,534,347.

The development of this transmission circuit created the need according to a field driver circuit for generating a rotating magnetic field which complies with the above-mentioned aspects. Previous attempts to attract such a field driver circuit result in various combinations of known oscillator circuits, in which Helmholtz normal field coil arrangements zt * were used to generate the rotating magnetic field. These However, in typical implementation, circuit arrangements had a “high power consumption at high frequencies and poor Feedback phase control characteristics which lead to domain dislocations led. '

The problem of high power consumption was primarily due to the common feature that Helmholtz's Norrrtalfeldspulen as
xm isolated loads have been operated. Infoloe desr.en regenerate the: le OsEillafcorkchaltimgen and consume during each rotation period? twice the energy of the rotating magnetic field_. R ^ i large Umlauffroauensen is required in these Osziliafcorschaitungen> htt energy because of the large, for'die .. '-Mberui-vicn »riordi? R: i tclu.n inductance qrofj.

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The poor rotation phase characteristics largely go with the known field driver circuits to the difficulties in developing a suitable switching device to interrupt the rotating end Field at the starting phase point after a number of complete field revolutions. For this difficulty

are
th transient ringing effects

causal which generated in the field driver circuits

if the field is quickly interrupted.

Another disadvantage of known field driver circuits, which contributes to their poor phase control characteristics, is the impossibility of determining the direction of the field circulation as a function of a binary control signal without misalignment to reverse the domains quickly. The possibility of field reversal a field driver circuit would add flexibility to the design of domain transfer circuits effect in devices for the transmission of magnetic domains.

On the basis of a circuit arrangement of the type specified at the outset, the invention proposes to solve the problems explained above that the first oscillator be connected to the one by the capacitor; and switching device which is connected to the coil and which is connected to the series circuit and which switches the series circuit into a resonant circuit and generates an alternating current in this circuit, in which the Schfxl telr>rlci.i; ung then fcuvi Schi i ^c fler: de. "kft",:; ? s qeb: eight

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If the binary control signal is present at the switching device in the second binary state, a diode connected in parallel to the switching device, which generates the alternating current without introducing damping effects (ringing effects) in the series circuit Xn depending on the * in the first binary state at the switching device at any time during the second half of the oscillation period applied binary control signal interrupts at the end of the oscillation period, and has a regeneration network lying above the coil, which keeps the envelope of the alternating current at full amplitude.

One aspect of the invention is, one simple built, reliable assign low power consuming magnetic field driver circuit indicate with a tuned oscillator circuit, which is an integer number of revolutions of an equinus Provides magnetic field component at a given frequency and phase. The oscillator circuit has a pre-excited, tuned Inductance-capacitance (LC) circuit with a field driver coil for generating the magnetic field component, a switching device lying in series in the resonance circuit for switching on and interrupting the field driver change turmoil in the Resonance or tuned circle at a given phase point and a field current amplifier, which is in a feedback branch and serves to determine the amplitude envelope and phase dec field current during an oscillation period to maintain.

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Furthermore, the invention provides a method for synchronously interconnecting a pair of tuned Oscillator circuits are specified with which a pair of normal magnetic field components is generated, which in a plane for the formation of a magnetic field circulating at the resonance frequency of the tuned circuits interact * A feature of the invention is that a field driver coil is in a pre-excited resonant or tuning circuit is included to create a low power magnetic field generator circuit ..

Another feature of the invention consists in the combination of a switching arrangement with the oscillating or tuning circuit for triggering and interrupting a field driver current at a predetermined phase point. The switching arrangement enables. the termination or interruption of the field drive current at the end of each full oscillation period as a function of a change in state of a binary control signal applied to the switching device at any time during the second half of the oscillation period.

Another feature of the invention is an automatic control circuit, which causes the alternating field driver current to be interrupted only at one phase point in an oscillation period is when the entire oscillation energy of the oscillating circuit is stored in a capacitor of the oscillating or tuning circuit is. This feature enables the field driver current to be terminated at the end of an oscillation period, without undesired

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Cause swing effects.

According to a further development of the invention, a method for connecting the resonant circuits of a pair of oscillator circuits is provided specified via at least one synchronization signal path, whereby a change in fei d drive s.trom in a Oscillator circuit is maintained by 90 ° with respect to an alternating field driver current in the other oscillator circuit is out of phase, and a resulting magnetic field is generated, which orbits in a plane.

According to another development of the invention is another Switching arrangement is provided which, for reversing the direction of flow of the resulting magnetic field, the corresponding of a pair of synchronously connected oscillator circuits. The reversal of direction is achieved in particular by that the order rtit of the oscillator circuits respectively are triggered, is reversed, and that different synchronization signals to the. Reversal of the relative phase difference between the corresponding field drive currents of the oscillator circuits to provide.

In the drawing show:

1 shows a simplified circuit diagram of the basic oscillator circuit with feedback;

2 shows a basic circuit diagram of a pair of tuned oscillator circuits in a control tracking configuration (master-slave configuration), d.io forming a driver circuit for a rotating magnetic field; and

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Fig. 3 is a basic circuit diagram of a pair of tuned oscillator circuits in cross coupling, which are a driver circuit for a reversible Form a rotating magnetic field.

The. basic tuned oscillator circuit according to the invention 10 is shown in FIG.

For purposes of explanation, the oscillator circuit 10 has a Matched LC (inductance-capacitance) circuit in combination with a switching arrangement that has a controlled field driver alternating current developed. A Feütrom regeneration network is also part of the oscillator circuit 10 and is used to the envelope of the field driver current at full amplitude to keep iruxlem unavoidable ohmic losses in the tuned Circuit or in the resonant circuit are cut off. The coordinated. LC circuit has a capacitor 1, a Field driver coil 2 and one connected in series between a current source 13 and a reference potential point 12 Spool 9 on. The current source 13 can consist of a voltage source E1 and a high resistance β.

The switching device has a transistor switch 4, the Collector and emitter electrodes between the current source and the reference potential point 12 lies. To the switching device also includes a diode 3, which is part of the Koilektor.-emitter line of the transistor switch 4 is connected in series in such a way that it is tested with respect to the reference potential point 12 with respect to the dpm base err) ittprübcrgang of the transistor 4 is polarized opposite.

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The field current regeneration network has a phase shifter 11, which in the illustrated embodiment consists of a capacitor 6 and a resistor 7, and a field current amplifier 5, which is in the feedback loop 14 connecting the connections of the field driver coil 2

is in series.

The capacitance of the capacitor 1 is chosen in connection with the inductance of the field driver coil 2 and to a lesser extent with the inductance of the coil 9 so that a matched LG combination is created with a resonance frequency which is equal to the desired field circulating frequency. The inclusion of the coil 9 in the tuning or resonant circuit is used to create a relatively loss-free excitation point with a suitable impedance matching for the field current amplifier 5. Because of the normally high inductance of the field driver or excitation coil 2, the required inductance of the coil 9 is usually small compared to that of coil 2 and does not make any significant contribution to the total inductance of the resonant circuit. Under certain circumstances a small ohmic resistor could be used instead of the coil 9 * The coil 9 is however preferable because it has practically no noticeable power consumption. -

The transistor switch 4 is normally not in one biased conductive state. This has the result that the capacitor 1 from the current source 13 to a polarity difference

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is charged by El when the transistor switch 4 is in its normal locking state.

The phase shifter 11 is any circuit that is able to determine the phase of a signal flowing through it, its frequency in the area of the coil through the capacitor 1 and the field 2 specific resonance frequency is to shift by 90 °. One way of realizing this function is to Use of the high-pass filter network shown in Fig. 1 with a ^ m capacitor 6 and a resistor 7. The field current amplifier 5 can be any known current amplifier, which is able to cause an additional 180 ° phase shift, and which is designed so that it the under has operational characteristics known as class C.

In short, the oscillator circuit 10 operates as follows:

The oscillation can become any one in the oscillation or tuning circuit Time triggered after the capacitor 1 from the current source 13 to a voltage difference of E ^ has fully charged, where E. is chosen so that it corresponds to the desired peak amplitude of the Frld alternating current. The vibrations are triggered by the fact that a control signal, e. of a suitable polarity to the base of the Transistor switch 4 is applied, whereby the transistor 4 switched through and the switch side of the capacitor 1

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effectively mass, d. This results in the Time in which the transistor switch 4 remains in its conductive state, a series resonant circuit that consists of the capacitor 1 and coils 2 and 9. Immediately after the switch side of the condensate 1 is grounded, a Alternating field excitation current to flow from coils 2 and 9 to capacitor 1. Since the inductance of the field excitation coil 2 usually much larger than that of the impedance matching coil 9, the electrical field energy initially stored in capacitor 1 becomes during the first quarter period transferred into the magnetic field energy in the first place the field-i driver or exciter coil 2 is assigned. Thereafter the energy between capacitor 1 and coil 2 oscillates according to the well-known sinusoidal shape of an LC resonance circuit, the Alternating field excitation current alternately through the transistor switch 4 and the diode 3 during the first and second Half cycle of each oscillation period flows. Hence ^ becomes a

corresponding magnet 'assigned to the field excitation coil 2 field component generated, which is proportional to the alternating field excitation current and the direction of which is determined by the magnetic axis 19 of the coil 2.

As mentioned above, this is from the phase shifter and the field current amplifier 5 existing field current regeneration network switched on for the purpose of avoiding unavoidable ohmic ' To compensate for losses during oscillation in the resonance circuit. The R & generations network also feeds the energy into the

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Resonance circuit back which. ■ supplied magnetic domains was to put this into one-layer of material depending to move from the magnetic field assigned to the coil 2.

The current amplifier 5 is triggered by a signal generated by the oscillation at the connection point 26 between the capacitor 1 and coil 2 is tapped and fed through the phase shifter 11. The amplifier is from the voltage source E. Biased towards the Class C operation. Additionally the amplifier's internal bias circuit is set so that the trigger threshold is close to a given signal peak derifchwingungsform of the tapped Signal lies. The exact level of the threshold is adjusted so that the amplifier can operate over a sufficient period of time During each period of the field current remains controlled, the amplitude envelope of the field current on one to maintain a constant level.

In the regenerative network, particular benefit is taken of the fact that the voltage induced at junction 26 by the field current flowing through coil 2 leads the current at junction 25 between coils 2 and 9 by ninety. In addition, use is made of the fact that the current at connection point 23 between capacitor 6 and resistor 7 leads the voltage at connection point 6 by 90 °. Therefore, when the signal sampled at point 26 is fed to amplifier 5, a feedback current is generated that is in phase with the current at point "" J ,

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at which the feedback current is coupled into the resonance circuit will.

When the transistor switch 4 is blocked, the flows

total between the capacitor 1 and the field excitation coil 2 oscillating energy back to capacitor 1 before the vibrations end. The only condition necessary to achieve this goal is that the transistor switch 4 can only be blocked during the second half of an oscillation period. If the field current passes through the Diode 3 flows. If this condition is met, the field current flows during the remaining part of the half cycle, in which the switch 4 is blocked by the diode 3. At the end of the period, the entire oscillation energy is in its initial state stored back in capacitor 1, and the field current is terminated exactly at the initial phase point or interrupted At this point the oscillator circuit 10 is ready to be triggered on another series of oscillations. From this explanation it should be clear that the diode 3 connected in parallel automatically with a suitable control signal system ensures that the alternating field current is triggered and terminated at the same phase point of the oscillation.

A second aspect of the invention is a method «To connect a pair of these basic oscillators circuits for forming a field excitation circuit that

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a rotating magnetic field in a single-walled .. domains using device generated. FIG. 2 shows a pair of basic oscillator circuits which are used in a control tracking arrangement are interconnected, the main or ' Control oscillator circuit 20 the tracking oscillator circuit 30. forces, at the same frequency, but 90-phase

offset with respect to the field excitation current of the main oscillator circuit 20 to oscillate. The magnetic axes 19 and 19 'of the field excitation coils 2 and 2' are arranged perpendicular to one another in a plane which is shown schematically by the plane 22 in FIG. The orto'gonal magnetic components caused by this work together in such a way that they cause a rotating magnetic field Xn of plane 22. This resulting field circulates with the angular frequency of the alternating field current components and has a strength that depends on the corresponding Am-

HJlIl

plitude ·:. curve of the current components is dependent. The direction of the rotating field depends at any point in time on the relative alignment of the field coil axes that are perpendicular to one another in the plane defined by this, the maintenance of the 90 ° phase difference between the two orthogonal AC field current components and the initial phase of Field current components.

The redesign of a pair of basic oscillator circuits shown in FIG into the rotation field excitation circuit, as shown in Fig. 2 requires some relatively simple modifications. First, the phase shifter in the oscillator circuit 30 is controlled by a current limiting resistor 6 '

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erpetzt whose reflection "tand * value is essentially the reactance of the capacitor 6 to that in the field current resonant fr Equens equivalent" Second, the resistor 6 ¹ and the amplifier 5 · line branch containing 15 from points 26 in the oscillator circuit 20 for Points 25 'in the oscillator circuit 30 "instead of from point 26' to point 25 'in the oscillator circuit 30. Third, the binary Premdsteuersi ^ gnal e ^ required to operate the transistor switch 4 in the oscillator circuit 20 via a delay circuit 16 the • transistor holder 4 • coupled in the oscillator circuit 30, the delay circuit 16 introducing a delay by a quarter of the period of the oscillator alternating current.

The purpose of the delay circuit 16 is to reduce the binary control signal by a quarter of the Peld cycle period to delay before the delayed signal to the transistor switch 4 'arrives' -... This creates a phase difference of 90 ° »wipe the alternating field excitation currents in the corresponding Oscillator circuits caused.

The switched on instead of a phase shifter in the branch 15 Resistor 6 'causes the field current of the oscillator circuit 30 at point 25' by a current jump which is the phase of the introduced into the corresponding point 25 in the resonance circuit of the oscillator circuit 20 Field current lags by "90 ^ '-. Therefore, the field current

t.

of the oscillator circuit 30 with the field current of the oscillator circuit 20 synchronized in such a way that it not only lags the field current of the oscillator circuit 20 by 90 at the beginning, but also with this phase difference via the line branch 15 is maintained or hachgefuhrt'wird. In In this embodiment, the modified line branch 15 actually represents the synchronization signal branch, which is the The field current in the tracking oscillator circuit 30 is phase-shifted by 90 ° with respect to the field current of the oscillator circuit 20 vibrates.

In addition, a control circuit 17 is advantageously used to control the second half of an oscillation period of the Determine the field current in the oscillator circuit 20 & u. One such a circuit prevents switches 4 and 4 »from being blocked during that part of the oscillation period in which the Feldetrom flows through the switch. As mentioned before, the transistor switches included in the circuits can be used to avoid decay or Damping effects in the Oscillating or tuning circuits are only blocked when the field currents through the switch electrodes bridging Diodes - flow.

One way to improve the control circuit 17 is to add a small resistor 18 between the point and the point 12 in Rpihe in the resonance circuit of the oscillator circuit 20 to be switched on. Furthermore, there is a diode 21 between

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the point 32 in the resonance circuit of the oscillator circuit 20 and

>. .-ν, - - - ■ an AND link 24 in the control circuit 17. The polarity of the ^u iode 21 is provided so that it only leads during the half-cell in which the alternating current flows through the diode 3. The current flowing through the branch 31 therefore provides the control circuit 17 ′ with an indication that the oscillator circuit 20 can be switched off without damping or ringing effects.

This particular type of addition to the control circuit 17 requires three logical links and a flip-flop, which respond only to signals of a positive polarity with respect to the reference point 12. Flip-flop 27 has only the normal set and reset connections S or R and an output whose signal is high when the flip-flop is set. The AND links 24 and 29 each have an inverting input and a non-inverting input, and an OR gate 28 has a pair of non-inverting inputs.

The AND gates 24 and 29, the OR gate 28 and the flip-flop 27 are arranged one behind the other in the manner shown in the control circuit 17 in FIG. From the circuit shown in the drawing it can be seen that when transferring de? binary control signal e. in an off state, the flip-flop 27 remains set and the

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Oscillator circuit 20 keeps operating as long as none Current flows through branch line 31. When a current flows through branch line 31, flip-flop 27 is reset and a switch-off signal via the logic elements

29 and 28 to the transistor switch 4 and to the delay circuit 16, which is sent to the oscillator circuits 20 and

30 is passed on, which receive the switch-off signals during the appropriate half-waves of their oscillations.

The control circuit 17 therefore enables the state of the binary control signal e to be changed from a switched-on state to a switched-off state, the control signal e. is coupled through to the associated oscillator circuits only during alternating half-periods in which the alternating field currents flow through the diodes 3 and 3 '. Accordingly, the switches 4 and 4 ¹ without overshoot or. Damping effects switched off in the corresponding tuning circuits. As mentioned above, the alternating field ^{currents flow through the diodes 3 and 3 1} during the remaining duration of the corresponding half-cycle in which the transistor switches 4 and 4 ¹ , respectively, are switched off. This makes it possible to completely end the particular oscillation periods and to excite the oscillator circuit for other oscillation sequences. Another embodiment of the basic field exciter circuit is shown in FIG. This embodiment features another method of connecting the resonant circuits of a pair of basic oscillator circuits via a pair of synchronization paths 41 and 51. The circuit

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is made so that the direction of rotation of the the resulting magnetic field generated in the circuit Depending on a change in state of a second binary control signal e_ can be reversed. · Additionally the syncronization paths 41 and 51 are also used for forcing purposes a fixed phase relationship of 90 ° between the two alternating field excitation currents. .

The embodiment of the field excitation circuit shown in FIG. 3 corresponds essentially to the circuit shown in FIG. 2, with a few exceptions. However, each of the synchronization signal paths 41 and 51 includes a current amplifier of the general type discussed above. In this embodiment, one of the amplifiers 45 and 55 must introduce a 180 phase shift or some odd multiple of that phase shift. The other amplifier must introduce a phase shift of 0 ° 360 ° or its integral multiple. Second, a current limiting resistor 42 (52) is usually required in the Synkronisierüngsweg '41 (51) so that the input of the amplifier 45 (55) is not due to the high signal level at the sampling point 26 (26 ¹ ) intermediate capacitor 1 (I ¹ ) and Coil 2 (2 ') is overloaded. Third, a switching network 60 which is excited by the second control signal e ^ is switched on and which is used for field reversal. The switching network 60 can be any known Sqhaltanordming that operates in response to a binary control signal and has three pairs of two-position connections (FIG. 3). As can be seen from the in Fig. 3

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shown circuit diagram results, the switching network 60 switches depending on 'a change in state of the binary control signal e _? the amplifiers 45 and 55 between the synchronization paths 41 and 51 and also interchanges the transistor switches to which the control signal e. is applied with a delay or without delay.

In short, the alternating field currents between the oscillator circuits effectively exchanged when it changes its state, so that the oscillator circuit with the leading Field excitation current in relation to the field excitation current in the other oscillator circuit becomes the oscillator circuit with the lagging field excitation current, and vice versa. Since the magnetic axes 19 and 19 'of the corresponding Field excitation coils 2 and 2 'remain stuck during the switching process, the resulting effect of the switching is that the direction of the resulting magnetic field in the plane 22 defined by the field coil axes reversed; will.

Others similar to the embodiment shown in FIG. 3 Developments of the field exciter circuit are possible within the scope of the present invention. For example, the relative The arrangement and direction of the amplifier 45 (55) in the conduction path 41 (51) are reversed to a high-resistance output excitation point for the amplifier 45 (55) at point 26 (26 ·) and a low-impedance input sampling at point 25 (25 ') »

This would make the large damping resistor 42 (52) superfluous.

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In addition, the coil 9 (9 *) could suitably by a
small effective resistance to be replaced, above which one
small sampling signal to excite the amplifier 45 (55) is developed. Various other embodiments can also be provided for the control circuit 17, which make the resistor 18, the diode 21 and the branch line 31 superfluous.

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Claims (6)

Claims Circuit arrangement for generating a rotating magnetic field, with a first oscillator having a series circuit of a capacitor and at least one coil, a signal source developing binary control signals and a current source which pre-charges the capacitor when a binary «control signal is present in a first binary state, characterized in that that the first oscillator (10, Fig. 1; 20 or 30, Fig. 2) a «on the through the capacitor (1, Fig. 1 to 3) and the Coil (2, Fig. 1 to 3) formed series circuit adjacent switching device (4, Fig. 1 to 3), which the series circuit switches on into a resonance circuit (9, 25, 19, 26, 1, 4, 12, -18) and generates an alternating current in this, in which the switching device is then brought to close the circuit when the binary control signal (e 1, Fig. 1 to 3) in the second binary state pending at the switching device, a diode (3, FIGS. 1 to 3) connected in parallel to the switching device, which the alternating current without the introduction of damping or overshoot effects (ringing effects) in the series circuit depending on that in the first binary state on the switching device (4) at any time during the two-tone half of the The binary control signal present at the end of the oscillation period, and a signal above the coil (2, Fig. 1 to 3) lying regeneration network (E2, 5, 6, 7, Fig.l, 209885/1201 which has the envelope of the alternating current at full Amplitude holds. 2. Circuit arrangement according to claim 1, characterized in that a second oscillator circuit (30; Fig. 2, 3) with that of the first oscillator circuit (20; Fig. 2) corresponding circuit elements via the regeneration network (E ", 5 ', 6', 15, Fig. 2; 42, Ε «," 55, Fig. 3) and a synchronization path (15, Fig. 2; 41, Fig. 3) is connected to the first oscillator circuit, the connecting elements being the second oscillator circuit with the first oscillator circuit to synchronize and maintain the envelope of the second Oszillatorechaltüng at full amplitude, and that the binary control signal s, the switching device (4, Fig 2,. 3) and by a predetermined value a delay to the switching means (3 ^1, 4 2, 3) the second oscillator circuit is provided with a device for controlling the corresponding oscillations of the alternating currents as a function of the binary control signal. 3. Circuit arrangement according to claim 2, characterized in that the series circuit of the first oscillator circuit behind the coil (2, Fig. 2, 3) and to the switching devices (4 and 4 ·, Fig. 2, 3) of the first and second oscillator circuits before the; ii> f. coupling device of the binary control signals a control circuit (17, 21, Fig. 2, 3) is connected, which the second half of an oscillation period of the field current of the first oscillator circuit and ensures that 209885/1201 the binary control signal in the first binary state is applied to the corresponding switching device (4, 4 ¹ , Fig. 2, 3) only during the second half of an oscillation period. > 4. Circuit arrangement according to claims 2 and 3, characterized characterized in that the associated with the first oscillator circuit Regeneration network (45, Fig. 3) between the first (connection) point (26 *, Fig. 3) of the at least one Coil (2 ', «Fig. 3) of the second oscillator circuit and the second (connection) point (25, Fig. 3) of the at least one coil (2, Fig. 3) of the first oscillator circuit switched on and a phase shift circuit having a phase shift of 0, 360 or its integral multiple introduces that associated with the second oscillator circuit ftegpneratlonsnetewerk (55; Fig. 3) a phase shifter circuit •. ο - that phase shifts a signal by 180 or an odd multiple of -180; and that a switching network (60, Fig. 3) with a device for the simultaneous exchange of the phase shift circuits (45, 55, Fig. 3) and the undelayed and delayed binary control signals is provided among the first and second oscillator circuits, depending on a change of state of a second binary control signal (e _n , Fig * 3) for reversing the field circulation direction is effective. 5. Circuit arrangement according to one of claims 1 to 4, characterized in that the Rooenerationsnetzwerk (5, S, 7, Pig. 1, 2; 5 ', 6', 7 ', Fig. -2; 45 or ^ r 55, Fig. 3) a back 209885/120 1 BATH ORIGINAL has coupling network, the circuit of which is chosen so that there is an alternating current at the first (connection) point OssillatorBpule scans the corresponding signal and a feedback current proportional to this signal into the series circuit at a second (connection) point of the coil both the same and the other oscillator circuit. 6. Circuit arrangement according to claim 1, characterized gekerrceichnet, d »D the regeneration network (E-, 5, 6, 7, Fig. 1) one Current amplifier (5) with a 180 phase shift circuit Λ ο ' and a 90j phase shifter (11). 209885/1201 Lee r s e i t e