DE1464497A1 - Electromagnetic toggle switch - Google Patents

Description

• "M" "*". ^. Cool '.' ■

DIETRICH UWINSKY ** ^W F «* MTENTANWALt 2 »» ^Wftl · ** ■

1464487

. Compagnie fran ^ aiee Thomaon-Houaton Paria 8e ₉ 173 »Bump rar d house ersann (France)

»Electromagnetic toggle switch"

French priority from the 28th quay 1962 from the French Patent application Hr- 893 933

The invention relates to an electromagnetic flip-flop circuit and besjellt Bioh inabes special on-such Klppsobal- to eat. use the semiconductor circuits and in which MaS-

Assumptions have been made to improve linearity.

Deflection made by deflection coils an electron beam section of a magnetic field is often used to control the tilting process in cathode ray tubes used in the field of technology. Bbenso is the use VQN electron tubes known to the "for creating the Magnetfeiet: ι deliver au energy necessary but this type of use 1st by a gane considerable energy consumption in" Hey possibility ßlektronenröhren in this type of use by semiconductor elements such as transistors au erseteen offers gewisafVorteile. Small space requirements, low weight, practically unlimited service life and invisibly low energy consumption make them extremely suitable for such applications. Their mode of operation, by the way, almost perfect switches, considerably improves the efficiency of the line prop 2788 _fl . ^ ₂ -

toggle switch «*! compared to those »the electron tubes related

Wherein only a very good linearity of the breakover voltage is required, whereby the volume available for the deflection coils is limited by the existing tree, the weight and the additional energies in the cup leaching coil, the ratio of the inductance L of these coils to the series resistance R is usually too low »When a constant voltage at its terminals could generate a current with a sufficiently linear change over time.

JDa8 linearity problem arises in case of use of electron tubes as well as the addition of semiconductor circuits. However, in the case of using electron tubes, the problem is »to achieve gate linearity, inasmuch as the increase in energy consumption is small compared to the total energy consumption »

The invention is now based on the problem of "one thing." transistorized in particular usable for television picture tubes To create an electromagnetic multivibrator in which measures are taken to compensate for the unpleasant distortion due to the resistance of the deflection coils. This is essentially achieved in the case of the one proposed here electromagnetic flip-flop by the fact that according to the invention the constant voltage applied to the deflection coils

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BAD ORfGINAL

sixr improve linearity a changeable is superimposed, whose Moeentan value is equal to the of the voltage drop * occurring at the deflection coils. This public waste is dependent on ton linear over time. The supply tension must also be calibrated change linearly and consequently be formed by a sawtooth wave. On the other hand, it is necessary that these A sawtooth voltage supplying a very high voltage source has low internal resistance.

Bach a particularly regional embodiment of the here the additional voltage source preferably consists of a low voltage source in a collector circuit Output resistor operated transistor »which is auegange-Beitig at a step-down transformer connected with its secondary winding in series with the deflection coils and whose Baais is acted upon by a saw-cream correction.

Here it is of particular advantage when following a tone Another feature of the invention through the sawtooth voltage Integration of the tilt return pulse takes place, which is carried out by a capacitor that is connected in legs via a diode to the terminals of an electronic holder of the Kippkreiaes enters, which afterwards discharges a resistor, an deseen Klemoen die 8äge »ahnepannttög erecheintp where the you, ch this Iapulequelle offered high resistance in the high jttngangewideretand tee in collector-operated transistor is matched.

ORIGINAL

809811/0659

Ie the case of using beetimater CRTs let c3 necessary "ereielon a current eu In the deflection coils, dor nonlinear function of time 1st · Dieο lot Tor especially in cathode ray tubes with a large deflection * inkel is Fail ₉ where the Xnderungen dee Strone depending on the Time represented by an S-shaped curve. In the sense of the invention, the change in the current that can be divided by an S-shaped curve as a function of time is achieved in this case by means of a voltage that can be represented by a parabolic curve as a function of time the Söge tooth correction voltage is superimposed.

In drawing do r _w iet an electromagnetic flip-flop of the type proposed in two erfindungfcgemftß example selected AusfUhrungeformen veranechaulicht schaltblldaäßig. FIG. 1 shows a simplified schematic diagram which allows the principle of operation of the flip-flop circuit proposed earlier to be easily explained. FIG. 2 shows the basic circuit diagram of an embodiment of the flip-flop circuit according to the invention. FIG. 3 shows graphical representations of the waveforms at different circuit points of the flip-flop circuit of FIG. 2. FIG.

In Fig. 1, a deflection coil 1 is shown »which can be electrically divided into an inductance L and an old Widerotand R connected in series. If a constant span is applied to terminals A and B of deflection coil 1

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voltage is applied, the current increases until the coil äurchtflie Send on Stroco i depending on the tent of the Sculljwung Udo switch X exponential ax ο servant exponential ^ Strocianstieg plumb to the presence of the resistances H zurteksuf ührim. Untor consideration of the voltage source Before the task will be explained later, the doa behavior of the circuit mathematically representing Diff-.fcntialssloichung can be written as follows »

B- * (ft -Ri

If the coil were free of resistance, this oil would chu.ig loud nt

IHo Xüüung dionur W fierentialglüiohung, naalloh

: .. u t kennsalohnot dia linearity of the current intensity depending on the side.

On (irund des in dam?; Iderat and R Voltage drop Ri, the voltage u at the terminals of the inductance Ι · changes as a function of time, since this voltage drop itself changes depending on the time, * da yes the voltage S is constant 1st.

SrflndungsgenäO is now an additional voltage source ν in Series connected to the power supply source K, and it measures are taken to ensure that the monthly value of the additional

BATH ORIGINAL - 6 -80 98 11/0659

voltage ν equal to that at the same moment in resistor R occurring voltage drop is «As a result, the voltage u applied to the terminals of the inductance remains constant» and the strength of the current flowing through it changes Bithin linearly as a function of time «As a result of this change, the voltage drop occurring at the terminals of the resistor B also changes linearly as a function of the Time. Accordingly, the additional voltage ν must have a linear change as a function of time. In other words, the corresponding additional voltage source must have a Deliver sawtooth voltage with a linear course of the sawtooth flanks

A direct application of the above-described principle of discovery will now be based on an example selected embodiment of a tilting circle on the basis of Flg. 2 To be explained in detail. _{A transistor T 1} operated in the emitter circuit is controlled by a train of positive pulses impinging on its base. These positive pulses “whose frequency corresponds to the line frequency * have a short duration t of, for example, 20fL of the period. During the time intervals T separating two successive positive pulses, a negative voltage is applied to the base of this transistor, which voltage is sufficiently negative to bring the transistor T ₁ into the saturation state. In the course of each positive pulse of time t, the base is held at a positive potential and transistor T _{1 is} blocked.

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• un your Solirltunsaknativa L · li ^ enae JCoJ! «Ktor den

I ₁ lot: i: .i \ o ^ with the exclusion of the Frlmä :: \; i «klung du-- i'l ^ ptranoformatare Tr ₁ i» Heilui / josoUriltet, "derm ·? Rmdcroc, on the potential \ ^! _B held! End by the capacitor G * from the Masira ontkoppolt and via a resistor II. on one; 3troi (iverüorguugaannRhlußk2emmo with the negative "potential -V is closedeuhlosten. Bio selnnary winding of the transformer" Tr ₁ bites the Zeilenteippspulo ,, the "I auo the withstood R and the inductor L comprised in the α shunt the emitter of the transistor Strorakreitios iiullektor-T- is a capacitor _C1 and a diode 6. ^ "

From the side of the primary winding d «o Ki p.u transformer * »Because the ratio Biit fiins is assumed to be

The deflection circle is composed of a resistor R and an inductance L lying in series with it. During each time interval T of the pulse during which the transistor T ₁ is turned on, a voltage Yb is applied to the terminals of this resistor R and the series inductance L due to the decoupling of the transformer in circuit point C by the capacitor Cx. The current i flowing through this deflection circuit thus increases exponentially if it would increase linearly if the resistance part R were zero.

When the transistor T ₁ is blocked by the positive pulse of duration t, the current i in the inductance L cannot stop immediately (point 1 in diagram (2) in FIG. 3) and charges the capacitor C ₁ on these circuit elements LR-O ₁ form an oscillating circuit that performs a free half-oscillation (points 1 to 2) _β ϊ & θ ÖBÄWWing im

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Circuit node A _p which is zero during the saturation of transistor I ^ while it is blocked, becomes negative (points 3 to 4) and then zero (point 5 in diagram (3) in FIG. 3) j at this moment the current i in the inductance L has changed direction because the capacitor Cj has discharged from the inductance I. The voltage in the circuit node A then tends to become positive, and when it is applied in the _{forward direction of the diode d 1} , a töif JV-a ^ Eja is derived and consequently au. ^{1 held} a value of about Hull. During the duration of the negative impulse in the balance point (points 3, 4 and 5 in diagram (3)) »that of a half-period of the free oscillation of the inductance t *. and corresponds to the circuit encompassing capacitor C ₁ (spark 1 and 2 in diagram (2)), is then equal to the duration of the lonkipprücklaufec,

The tilting circle described above is the usual type of hold. In order to improve the linearity, according to the invention, a sawtooth voltage is superimposed on the tilting voltage applied to the deflection coils, so that this addition is compensated for in the voltage drop that causes the internal resistance of these coils tall "from a diode d ₂ and a ^". capacitor G ^ lying in series with it formed, which series connection to the $ leift-dee emitter-collector-itreiees of the tran ^ istore T * $ kf! & ~

'■ ■ ■ ■ ** ι' ^ ₁ *.

It is closed. t ·, *, ■ '' c

■ -: ■ · .. · BAD ORIGINAL '/''P ■ ' ■

Uli ''<* voltage pulse in circuit node A wirl

used to charge uia via the diode dg with its peak value dt >> Cofid? nsator Cg. The presence of this Kondenefctorfi in no way noticeably disturbs the operation of the circuit, but with the proviso that its value is considerably smaller than the capacitor C ₁ . The capacitor C ₂ discharges through the resistor H ₁ to ground. A capacitive generator of a sawtooth voltage is thus obtained, which has an exponential time dependence. If the time constant C ₉ H ₁ compared to the time T der

. ■; .iw '. · _ * ·. ■ very grott

negative control pulses of the transistor T ^ occur in the circuit point 3 through integration of linear sawtooth characters . These characters are designed to correct the magnetic line-tilting process. -Bich does not change the linearity of the tilting process with the amplitude, since the sawtooth correction voltage is proportional to the tilting amplitude (per change A and the voltage at the terminals of R ₁ ).

.Ee is therefore important to take measures that the J & Gesahnzeichen of the circuit point B to the for the Throw the coil provided for horizontal deflection accordingly · #As was already indicated before, this connection must be made on the input side of the sawtooth characters (circuit point B) in a high impedance and on the side of the deflection coil have a low impedance. As a result ι possessing the double quality, in collective operated transistor Tg used. ..

The linear sawtooth symbol appearing at circuit point B meets the base of the capacitor C ₁

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Translator J ^ operated in collector circuit. The. Sawtooth voltage is calibrated again on the emitter of this transistor and * is applied to the primary winding of a step-down transformer Tr ₂ via the resonance circuit R ₂ O · This · sawtooth voltage is then placed on the secondary side S of the transformer Tr ₂ and thereby going-εpulen deflector to and is εο superimposed on the secondary winding of the breakdown transformer Tr ₁ occurring voltage. This Uber.-Lagorung takes place in the sense that the voltage drop due to the resistance R of the deflection coils "Si is compensated"

So that the transformation _{ratio of the transformer Tr 2 has} the // location η, the voltage at the primary winding dioDös SranoformatorG, which is approximately equal to the voltage at the circuit point β iat, must have the magnitude of η χ Ri, where i is the amplitude from peak to peak of the breakover current, since this voltage is intended to compensate for the voltage drop at the terminals of the resistance Π of the deflection coil. On the other hand, the impedance returned via the correction circuit in friction with the breakdown circuit is approximately the same

2
a capacity value ron ß χ η χ C ₀ , where ß is the current amplification _{factor of the transistor T 2 o}

The oversight ratio η of the transformer Tr ₂ is chosen such that η χ fli remains below twice the value of the useful supply voltage of the transistor T _{2 in} order to avoid saturation of the same. This tension is

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U64497

equal to the usual feed potential Y _0, among other things, changes the voltage drop in the resonant circuit figC ^ of the emitter oil of the transistor i _g . The mean current in the transistor BjuS must be greater than 1/2 l / a, so that the Trane gate T _{2 is} never blocked and always offers the Kippstroa returned in its Sraitterkreie _{by the transformer Tr 2 a low impedance.}

. The linearity of the sawn tooth flanks can be changed or improved according to known methods. In the case of the guiding bite bulb of FIG. 2, the sawtooth voltage coming from the node B is made linear; For this purpose, the resistor R ₁ and 4 resistor R provided for the discharge of the capacitor C ₂ , the base of the Sranßiotors I ₂ via the capacitor Cg (or possibly directly) are connected to the high-voltage connection of the primary winding of the transformer Tr ₂ , which is the usual The type of circuit corresponds to · It is possible _{to obtain sawtooth characters from an additional winding applied to the breakdown transformer Tr 1} , ura take the minimum energy from the breakover voltage ssu.

Another embodiment is possible in the special case of using a Yidicon picture tube. In this case, the breakover power is low and the supply voltage V ₀ is usually much greater than the voltage Yt at the terminals dee. Breakdown transformer Tr ₁ . The circuit is then carried out in accordance with the circuit diagram of #ig «4. The correction stage is fed by the voltage difference Vo - Vb, whereby

BATH ORIGINAL _ _1g

jeglicüor additional power consumption since espeiet in this special case transistor in series with the transistor T ₁ ^ is avoided ·

BAD OR / GfNAL

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Claims (1)

Patent claims: Electromagnetic trigger circuit, characterized in that the constant voltage (E) applied to the deflection coils (L) is superimposed with a variable additional voltage (v), the instantaneous value of which is equal to that of the ohmic voltage drop occurring at the deflection coils 2ο flip-flop circuit according to claim 1, characterized in that the additional voltage source e & f .. consists of a translator (Tg) operated in a collector circuit with a low output resistance ^ the output side of which is a step-down transformer (Tr _{2) connected in series with the deflection coils (L) with its secondary winding (S)} ) and the base of which is applied by a sawtooth correction voltage » 3, flip-flop circuit according to claim 2, characterized in that the sawtooth voltage is achieved by integrating the Kipprüoklaufimpulaes, which occurs through a _{capacitor (G 2} ) _{connected in series via a diode (dg) to the terminals of an electronic switch (T 1} ) of the flip-flop circuit, which then discharges to a resistor (R ^); at whose terminals the sawtooth voltage appears, whereby the high impedance offered by this pulse source is connected to the high input resistance of the transistor (T ₂ ) operated in the collector circuit. BAD O _R1QINAL 809811/0659 4. flip-flop circuit according to claim 3 »characterized in that the change in the current as a function of time which can be represented by an S-shaped curve is achieved in that a voltage which can be represented by a parabolic curve as a function of time is superimposed on the sawtooth correction voltage» BAD ORlGiNAL 8098 1 1/0659