CURRENT AND TENSION RULE CIRCUIT FOR ELECTRONIC INTERFACE CIRCUITS IN APPLICATION WITH TELEPHONE EXCHANGE PLANTS

The invention concerns Stromund Spannungsregelangsschalttmg f'dr electronic interface scarf seaweeds in application with Femsprechvermittlungsanlagen for the purpose. the gleichstrommafiigen uncoupling of two line sections, in particular Sprechademabschnitte. Speech vein sections occupied the Irish Republican Army course of a developed Femsprechverbindung from the most diverse Eindchtungen with Gleichs COM are gespoist and mtissen from there from each other direct current times industrial union to be getronnt. At the interfaces between successive Sprechademabschnitten from there $ehnlttstellenschaltungen intended, those are the SprechwechselstrSme the zwlschen neighbouring Sprochademabschnitten iibertragon, the Gloi hstrGmo and - splinter .nungen jodoch gegoneinandor abriogeln. The classical Femsprechtechnik used as Sohnittstellensohaltungen Ubertrager with Besehaltung, which in animal modern technology dutch electronic longing CCIT position attitudes in form yon electronic Gabelsehaltungen he are tzt. Aueh the combination yon Ubertrager and fork is verweadet. The Erfindtmg concerns an interface circuit in impedance-transparent Obertragungsteehnik, in order to avoid one zus itzliehe “four-wire island”. £rfindung sees placed the task has to create a current and Spannungsregelungssehaltung fiir Sclmittstellenschaltungen those the requirement stomach, how they are placed with Femsprechvermittlnngsanlagen with gleichstromm the il3igen uncoupling of two line sections, correspond. Erfindungsgemiil3 is obtained this thereby, dab to the direct or modified illustration of the Impedanzverhiiltnisse between the two line sections the line ends of these two line sections at the interface connected with the exit per a controllable Stromoder supply terminal is, which in Abh ngigkeit veto river or the tension at that interface-switchinglikes different side of the interface circuit or in Abhiingigkeit yon the differences of the StrGme or the tensions anf both sides that in each case is in such a manner regular, dab the Sir0me and tensions on the one side in each case is equal rough as on the other side or to each other in given holding back nits. A special Ausfiihrungsbeispiel of the invention is developed in such a manner, dal the two decoupled Leitungsabsehnitte to the inverting Eing nge per a Operationsverstgrkers serving as controllable power source angesehlossen is, whose niehtinvertierende entrance is connected with the exit of a third Operationsverstgrkers, at its Eing ingen one the difference of the Str6me animal of both line sections proportional Spanning lies. It is in addition, m0glich, yon that suffers decoupled guidance liking sections with the inverting and the other with the non-inverting entrance operation amplifier rkers to connect, its output signal a placable, the first mentioned line section feeding, when operation-strong trained current queue directly and a second, likewise placable trained as operation-strong, which feeding power source steers latter line section more tiber a zwisehengeschaltetes reversal member. Another circuit variant of the invention is concretely in the way aasgefGhrt, dal a a line section yon the steUbaren, when operation-strong trained power source is connected to and Gber an impedance buffer with the second line section fed, whereby the impedance buffer a Strommel3glied contain, which adjusts the Stroke of the river fed into the first line section by means of the placable power source to the StiSrke of the river nden in the second Leitungsabsehnitt flie. In some Anwendungsf are erwiinseht a transformation of the zwisehen two sides of the longing CCIT place meBbaren impedances illen in accordance with B a given Teilnngsverh ltnis. In the case of the previous Sehaltung for it one can be consulted dureh division animal tension on the second side won Teilspannung or in reverse direction can the EinsteUung of the river in gleieher way of a division unterwoffen to become for the controlling of the tension on the first side of the longing CCIT place. Invention in accordance with iBe interface circuit is suitable also for the conversion of an asymmetrical Spannungsftihrung (tension between a line and an earth) on symmetrical Spannungsfiihrung (tensions on the two lines are). In this case the symmetrisehen lines fibre two kGnnen as Stromoder $pannungsquellen serving complement RH transistors to be fed, which are against-intimately headed for in series arranged WAD. In at-PS 381,430 is a Sehnittstellenschalmng with asymmetrical egg course and symmetrisehem exit beschrioben, in which a network with more complex is used lmpedanz. Here against the Kapazit ten required tolerances are placed, which raises the price of the plant. In order to go around this, with these well-known Sehaltung only one condenser is used, whose tolerance without Einflu8 is on the symmetry of the Sehaltung. Zus itzlich compensates there a Entzorrersehaltung the Frequenzabhangigkeit of the network. liei the invention depends it however on the impedance match between Einund exit, itself-twists those with the well-known Sehaltung no MaBnahmen are met. Ausfiahrungsbeispiele of the Erfindnng are represented in the Zeiehnung. The Fig. 1, 2 and 3 shows as one ports out-arranged interfaces, w it-ends itself the Ausftihrungsbeispiele sews the Fig. 4 to 7 to longing CCIT position attitudes with conversion yon more symmetriseher to asymmetrical potential distribution refer. With all Ansfiihrungen are against the different sides of the longing CCIT place circuits resting the tensions with (U1) and (U2) bezeiehnet. In the individual Aasffihrungsbeispielen existing resistance there, incoming goods are it require-borrowed are provided, with own Bezngsziffern, gei some Sehaltungen are RK 397,010 B only two types yon resisted intended, n mlich low impedance, those are uniformly with its resistance value (g 1) characteristic and high impedance, which uniformly the same GrOl] e and designation (R2) exhibit. The designations (g 1) and (R2) are, since they did not consult tiberaU for position indication, generally in clammy one set. Fttr all examples is valid, dab the resistance values (R2) for gr61] it is substantial as the resistance values (g 1). With the Ausffihrung after Fig. these tensions (U1) are appropriate for 1 and (I32) at the inverting Eing ngen two operation amplifiers more rker (1) and (2). These are with one Riickkopplungswiderstand each (3) and/or (4) provided (StrommeBwiderstande), which both the resistance value (g 1) to exhibit and the Ausgiinge of the operation-strong concerned (1) and/or (2) with their inverting Eing ingen connect. From four Widerst nden (5, 6, 7) and (8), which exhibit uniformly the same resistance values (R2), exist two voltage dividers, their center taps with the Eing towards wines third operation verse rkers (9) are connected. Both voltage dividers between the center taps GET (5, 6) and (7, 8) one the difference between the two at the Rtickkopplungswiderst nden (3) and (4) lying tensions proportional tension (U3) form out. This tension (U3) is, since at the Rtickkopplungswiders nden (3) and (4) auflretenden tensions (J1.R1) and/or (J2.R1) on the two sides of the interface circuit einbzw. ausfliel] Str6men (J1) ends and/or (J2) proportionally are, also the difference of these Str6me proportional. Thus the current difference (J2 - J1) illustrating tension (U3) is because of the Eing ingen the operation verse rkers (9), whose output voltage to the non-inverting Singeing of the operation amplifiers more rker (1) and (2) are attached, whereby output currents (J1) and/or (J2) the Operationsverstiirker (1) and/or (2) on same values to be regulated. In addition, thus gew ihdeistet, dal] the input voltage (U1) and the output voltage (U2) are animal interface circuit unabh ingig of that jewgiligen load on Einbzw. Original side always the same value (U1 = U2) exhibit. The Fig. shows 2 in simplified representation eing with two controllable power sources (10) and (11) equipped interface circuit. The input current (J1) fliel] t more tiber the power source (10) gin, w is supplied rend output current (J2) yon the power source (11). The input voltage (U1) affects its inverting entrance at the output voltage (U2) the non-inverting entrance einesOpemtionsverst trkers (12), wiihrend lies. Those the difference (U2-U1) between Einund output voltage proportional output voltage of the Operationsverstarkers (12) affects on the one hand directly on the control inlet of the power source (11) and on the other hand fibre a reversal member (13) against-intimately the control inlet of the power source (10). Due to this Schaltanordnung the Effect results, dab everyone between the tensions (U1) and (U2) arising voltage difference at the exit of the Operationsverstarkers (12) the occurrence of a tension causes, those the power sources (11) and (12) against-intimately in the way, dab in Abh gigkeit yon animal heads for respective ginbzw. to be caused, dab the difference (U1 - U2) between animal Einund output voltage and thus the impedance transparency of the interface circuit disappears to output load such nderungen the Str6me (J1) and/or (J2) is obtained. With the Ausffihrung after Fig. 3 the first line section, which ffihrt the tension (U1), is fed yon a placable power source (14) with a river (J1). Further animal first line section is attached to not invert towards entrance of a Operationsverstarkers (15), switched as impedance buffers. To the exit of the Operationsverstiarkers (15) more tiber gin StrommeBglied (16) is animal second line section is attached, dessert tension (U2) by means of rtickgekoppelten operation amplifiers rkers (15) on the Weft the tension (U1) regulated. Thus the adherence to the condition (U1 = U2) is it-performed gew. The Mel worth exit it Strommel] of member (16) is to the position entrance of the power source (16) attached nnd steers thereby the Ansgangsstrom (J1) the Stromqnelle (16) to the value the fibre the second line section fliel3enden of river (J2). Thus also the observance is given to the condition (J1 = J2), together with the forced equality of the tensions (U1) and (U2) the impedance transparency of the Schnittstellenschaltnng guarantees. The Fig. 4 a impedance-transparent interface circuit, TIG it shows in the Femsprechtechnik as interface between to a participant place ftihrenden, regarding the earth potential symmetrical Sprechadem (A, b) and the connection fiihrenden to the switching network, which are single-pole grounded, one uses. The circuit shown has aul3erdem the characteristic, impedances in the Verh Utnis 1: to transform 4. Also in this example the Widerstiinde with its resistance values is characteristic. The tension (U2), resting against the switching network side, becomes at a voltage divider with the Teilwiderst nden (3R2) and (R2) in the Verh ltnis 1: 4 divided and the quartered tension the non-inverting entrance an operation amplifier is ihrt irkers (17) zugef, together with a second operation amplifier 4rker (18), working in the Gegentakt, the river (.11), ffihrenden to the participant place, is produced. The symmetrical portion participant-laterally fliel end river between the Singeing of a power source with Differenzelng ingen (19) fed. This symmetrical portion with the help of one from four WiderslJ nden the Gr61] e (R2) existing Widerstandsbriicke won, the yore Spannungsabfail of two Ausgangswiderst the de Gr613e (g 1), which in the output current circles of the operation amplifiers more rker (17) and (18) lies, one feeds. The power source (19) supplies the river (J2), ffihrenden to the switching network, whose adjustment with the help of an output resistance and with the help of a positive feedback circle and an RK 397,010 B Gegenkopplungskroises in the Sine takes place, dab impedances on the Teilnehmerseito in the same Vcrhiilmis 4: 1 zuriicktransformiert. The use of the Difforenzstromquelle (19) erm6glicht the Kompensafion yon asymmetrical StSrsignalen, which are fed into the two access lines, since they waive themselves according to the difference formation at the Vorst rkereingang as against-intimate Signalo. Fig. a SchnittsteUenschaltung, which between an office fibre carrying fibre, shows 5 the Anschliisse (RK B) and a KoppeIfeld fibre the Ansehlng (K) is switched on. An operation amplifier more rker (20) client than koppolfeldseitiger ammeter. A further operation amplifier more trker (21) steers the river (J1) in the cooperation with a transistor (22) in Riehtung to the Amtstibertmgung with the help of a fibre the Anschlfisse (A) and (B) offered DC voltage. With (23) in as reversal member of working Operationsverstiirker is designated, dex in the Gegentakt to the output voltage the operation amplifier is rkexs (20), together with diesex the input signal ffir the Opemtionsverst more rker (21) lieferk wodumh the symmetrical Aussmuerung toward office fibre carrying vergrOgert and smaller Anfordexungen to the GIeichtakmnterdriickung of the there Stromqnelle posed warden k6nnen. A Differenzverstiirker (38) miBt the Weehselspannung at a/B Adera and spends sic direction switching network. In Fig. 6 is as konkrotos AusfiihrungsboispieI with Angabo allor data of the Bautoile eino cut position attitude for the connection of the Sprechadem ffihrenden to a Teilnehmerstello (A, b) to one to the zugoh&igen Koppelfold fiihrenden fastened (K) represented. In finer series connection liogen as the $tromquellen for the supply of the Sprechadem (A, b) serving transistors (24) and (25), which more tiber happen rige Ol more rationsverstSrker (26) and (27) to be headed for. To uncoupling the Spannungsinformafion yon the Sprechadern (A, b) to the Koppelfeldansehlul3 (K) is an operation amplifier ker (28) intended, which serves as tensiometer. To the Zweek of the switching network-lateral current measurement an operation amplifier is more rker (29) intended. A further operation amplifier more ker (30) serves than automatic controller for the stabilization of the power sources (24) una (2s'). Fig. sehlieBlich a Ausffihrungsbeispiel with concrete data, that points 7 likewise a longing CCIT position attitude to the connection of an electrically symmetrisehen Teilnehmersprechadempaares (A, b) with liner elektriseh unsymmetrisehen switching network line (K) represents. At the Sprechadern (A, b) are appropriate for two komplemenffffe serving transistors (31), as supply terminals, nnd CO2), yon those the latter yon the switching network line (K) fibre a ZwischenverstSrker (33) direst one angesmuert. An inverting Verstiirker (34) sets that for the transistor (32) zugef ihrte signal into an inverse signal for the controlling of the transistor (31) urn. The Ubertmgung the language alternating current yon the Sprechadem (A, b) two serve into the collector circuits of the transistors (31) and (32) Widerst de (35) and (36) eingesehaltete. Yon to the ends of these Widerst nde (33) WAD (fibre assigned MeBwiderstande WAD condensers arrives to 36) measured tensions at the Eing nge of a power source with Differenzeing towards (37), at whose exit the switching network line (K) angesehlossen is.