DE3512327A1 - Circuit arrangement for powering an electronic dialling device in telephone subscriber stations - Google Patents
Circuit arrangement for powering an electronic dialling device in telephone subscriber stationsInfo
- Publication number
- DE3512327A1 DE3512327A1 DE19853512327 DE3512327A DE3512327A1 DE 3512327 A1 DE3512327 A1 DE 3512327A1 DE 19853512327 DE19853512327 DE 19853512327 DE 3512327 A DE3512327 A DE 3512327A DE 3512327 A1 DE3512327 A1 DE 3512327A1
- Authority
- DE
- Germany
- Prior art keywords
- circuit arrangement
- storage capacitor
- circuit
- subscriber stations
- parallel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
Description
Schaltungsanordnung zur Speisung eines elektronischenCircuit arrangement for feeding an electronic
Wahlorgans in Fernsprechteilnehmerstationen Die Erfindung betrifft eine Schaltungsanordnung zur Speisung eines elektronischen Wahlorgans in Fernsprechteilnehmerstationen, die mit einer konventionellen Sprechschaltung ausgestattet sind.Voting Organ in Telephone Subscriber Stations The invention relates to a circuit arrangement for feeding an electronic voting organ in telephone subscriber stations, which are equipped with a conventional speech circuit.
In Fernsprechteilnehmerstationen mit konventioneller Sprechschaltung wird die Speisung eines elektronischen Wahl organs in der Regel parallel zur gesamten Sprechschaltung abgegriffen.In telephone subscriber stations with conventional speech switching the feeding of an electronic electoral body is usually parallel to the entire Voice circuit tapped.
Zur Einhaltung der geforderten Werte der Rückhörbezugsdämpfung sowie bezüglich der Einfügungsdämpfung sind dazu aufwendige Schaltungsmaßnahmen erforderlich.To comply with the required values for the sideline reference attenuation as well as With regard to the insertion loss, complex circuit measures are required for this.
Der Erfindung liegt die Aufgabe zugrunde, eine Vereinfachung dieser Schaltungsmaßnahmen zu erzielen.The invention is based on the object of simplifying this To achieve circuit measures.
Diese Aufgabe ist durch die im Kennzeichnungsteil des ersten Patentanspruches dargestellte Schaltungsanordnung gelöst, die nachfolgend anhand der Zeichnung näher erläutert wird.This task is due to the in the characterizing part of the first claim shown circuit arrangement solved, the following with reference to the drawing is explained.
Die Speisung des Wahl organ wird parallel zur Mikrofonkapsel M abgegriffen. Damit eine ausreichende Spannung am Wahl organ zur Verfügung steht, wird anstelle einer bekannten Kohlekapsel eine heute übliche Transistor-Sprechkapsel verwendet.The supply of the choice organ is tapped parallel to the microphone capsule M. So that there is sufficient tension on the choice organ is available, instead a known carbon capsule uses a transistor microphone capsule that is common today.
Das Wahl organ setzt sich aus einem Wahlbaustein und der zugeordneten Tastatur zusammen. Die Speisung des Wahlbausteins wird über einen Entkopplungs-Widerstand R abgegriffen.The elective organ consists of an elective module and the assigned one Keyboard together. The optional module is fed via a decoupling resistor R tapped.
Um eine geringe Änderung der Sendebezugsdämpfung zu gewährleisten, muß der Entkopplungswiderstand R wesentlich größer als der dynamische Innenwiderstand der Mikrofonkapsel M gewählt werden. Da der Innenwiderstand der Mikrofonkapsel M jedoch klein ist, z. B. typisch 100 Ohm, wird die Sendebezugsdämpfung bei relativ kleinen Entkopplungswiderständen, z. B. R L 2 kOhm, kaum beeinflußt. Entkopplungswiderstände R der genannten Größenordnung genügen, um die derzeitig üblichen CHOS-Wahlbausteine anzuschließen, zumal der Spannungsabfall über den Entkopplungswiderstand R klein ist bei den geringen fließenden Strömen.To ensure a slight change in the transmission reference attenuation, the decoupling resistance R must be significantly greater than the dynamic internal resistance the microphone capsule M can be selected. Since the internal resistance of the microphone capsule M however is small, e.g. B. typically 100 ohms, the transmission reference attenuation is relative small decoupling resistances, z. B. R L 2 kOhm, hardly affected. Decoupling resistors R of the order of magnitude mentioned are sufficient for the current to connect the usual CHOS optional modules, especially since the voltage drop across the decoupling resistor R is small for the small flowing currents.
Aufgrund dieser elektrischen Verhältnisse ist eine Fernsprechteilnehmerstation mit Tastenwahlorgan mit geringem Aufwand realisierbar. Wie in der Zeichnung dargestellt ist bei betätigtem Gabelumschaltekontakt GU die Sprechschaltung der Fernsprechstation über den Impulsgeberschaiter NSI direkt an die Leitungsadern La, Lb angeschaltet.Because of these electrical conditions is a telephone subscriber station can be implemented with little effort using a push-button selection device. As shown in the drawing is the speech circuit of the telephone station when the hook switch contact GU is activated connected directly to the wires La, Lb via the pulse generator switch NSI.
Die Speisung des Wahlbausteins wird, wie bereits dargelegt, über einen Entkopplungswiderstand R parallel zur Mikrofonkapsel M abgegriffen. Eine Zenerdiode G1 dient als Überspannungsschutz. Da das Wahlorgan für eine Wahlwiederholung ausgelegt ist, ist ein Speicherkondensator C vorgesehen, deren Entladung über die Sprechschaltung eine Diode G2 verhindert.As already explained, the elective module is fed via a Decoupling resistor R tapped parallel to the microphone capsule M. A zener diode G1 serves as overvoltage protection. Since the electoral body designed for one redial is, a storage capacitor C is provided, the discharge of which via the speech circuit a diode G2 prevents.
Eine weitere Diode3 entkoppelt den Speicherkondensator C von der Versorgungsspannung VDD des Wahlbausteins. Somit wird der Wahlbaustein nach dem Schließen der Leitungsader La durch den Gabelumschaltekontakt GU unmittelbar mit Spannung versorgt und die Fernsprechstation ist sofort sprech- und wahlbereit.Another diode 3 decouples the storage capacitor C from the supply voltage VDD of the elective module. Thus, the elective module becomes after the line wire is closed La directly supplied with voltage by the fork changeover contact GU and the Telephone station is immediately ready to speak and dial.
Weiterhin sind zwei Transistoren T1, T2 und eine zweite Zenerdiode G4 parallel zur Sprechschaltung gelegt. Diese Anordnung wird durch den Ausgang nsa des Wahlbausteins aktiv geschaltet. Die Spannung an den Leitungsadern La, Lb wird im Wahlzustand, also bei aktiv gesteuertem Wahlbaustein, durch die Basis-Emitterspannung des Transistors T1, die Zenerspannung der Diode G4 und die Sättigungsspannung des Transistors T2 bestimmt, sowie einen Spannungsabfall am Verpolungschutz und am Impulsgeberschalter NSI.There are also two transistors T1, T2 and a second Zener diode G4 placed parallel to the speech circuit. This arrangement is made possible by the output nsa of the elective module is activated. The voltage on the conductors La, Lb is in the dialing state, i.e. with the dialing module actively controlled, through the base emitter voltage of the transistor T1, the Zener voltage of the diode G4 and the saturation voltage of the Transistor T2 is determined, as well as a voltage drop at the reverse polarity protection and at the pulse generator switch NSI.
Die Spannung zwischen den Emittern der Transistoren T1 und T2 wird konstant gehalten, unabhängig vom Ladezustand des Speicherkondensators C.The voltage between the emitters of the transistors T1 and T2 becomes kept constant, regardless of the state of charge of the storage capacitor C.
Dadurch ist die Spannungsversorgung des Wahlbausteins auch bei entladenem Speicherkondensator C gewährleistet, wie auch die Spannung an den Leitungsadern La, Lb im Wahlzustand unabhängig vom Ladezustand des Speicherkondensators C ist.This means that the voltage supply of the dial-up module is also available when the module is discharged Storage capacitor C ensures, as well as the voltage on the line wires La, Lb is independent of the state of charge of the storage capacitor C in the selected state.
Letzterer wird während der Zeit geladen, in der die Transistoren T1 und T2 leitend geschaltet sind.The latter is charged during the time in which the transistors T1 and T2 are switched on.
Das Parallelschalten des Speicherkondensators C zur Sprechschaltung bewirkt außerdem der Dämpfung des Wähltones.The parallel connection of the storage capacitor C to the speech circuit also causes the attenuation of the dial tone.
Wird zusätzlich ein Widerstand in Serie zum Speicherkondensator C gelegt, so ist die Höhe der Dämpfung des Wähltones veränderlich. Da jedoch weiterhin ein Teil des Schleifenstromes über die Sprechschaltung fließt, entsteht für den Teilnehmer nicht der Eindruck einer "toten Leitung".If there is also a resistor in series with the storage capacitor C placed, the level of attenuation of the dial tone is variable. But still there part of the loop current flows through the speech circuit, arises for the Participants do not have the impression of a "dead line".
Ferner sind durch den Speicherkondensator C die Wahlimpulse des Impulsgeberschalters NSI im Fernhörer nur schwach vernehmbar.Furthermore, the selection pulses of the pulse generator switch are through the storage capacitor C. NSI only faintly audible in the remote receiver.
Mit dem Ende der Wahl werden die Transistoren T1, T2 über den Ausgang nsa des Wahlbausteines abgeschaltet.With the end of the election, the transistors T1, T2 will be on the output nsa of the optional module switched off.
Die Sprechschaltung erhält somit wieder den vollen Schleifens strom der Sprechadern La, Lb.The speech circuit thus receives the full loop current again the speech arteries La, Lb.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853512327 DE3512327A1 (en) | 1985-04-03 | 1985-04-03 | Circuit arrangement for powering an electronic dialling device in telephone subscriber stations |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853512327 DE3512327A1 (en) | 1985-04-03 | 1985-04-03 | Circuit arrangement for powering an electronic dialling device in telephone subscriber stations |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3512327A1 true DE3512327A1 (en) | 1986-10-09 |
DE3512327C2 DE3512327C2 (en) | 1987-11-19 |
Family
ID=6267293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19853512327 Granted DE3512327A1 (en) | 1985-04-03 | 1985-04-03 | Circuit arrangement for powering an electronic dialling device in telephone subscriber stations |
Country Status (1)
Country | Link |
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DE (1) | DE3512327A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3612823A1 (en) * | 1986-04-14 | 1987-10-15 | Deutsche Telephonwerk Kabel | Circuit arrangement for feeding electrically erasable and programmable non-volatile memories in telephone terminals |
DE3628996A1 (en) * | 1986-08-26 | 1988-03-10 | Krone Ag | CIRCUIT ARRANGEMENT FOR A TELEPHONE |
EP0417977A2 (en) * | 1989-09-15 | 1991-03-20 | Mars Incorporated | Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone |
US5216710A (en) * | 1991-01-07 | 1993-06-01 | Winbond Electronics Corp. | Liquid crystal display driver and power supply |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2354539A1 (en) * | 1972-11-03 | 1974-05-09 | Kapsch Telephon Telegraph | CIRCUIT ARRANGEMENT FOR ELECTRIC DIRECT CURRENT PULSE BUTTONS |
DE2117291B2 (en) * | 1970-04-10 | 1978-06-15 | International Standard Electric Corp., New York, N.Y. (V.St.A.) | Telephone for four-wire connection |
DE2927474A1 (en) * | 1978-09-20 | 1980-04-03 | Siemens Ag | Supply circuit for pushbutton selection keyboard - is used in telephone pulsed selection and has voltage divider, energy store and depletion FET |
DE3223607A1 (en) * | 1982-06-24 | 1983-12-29 | Marko 11000 Belgrad Petrović | Hybrid transistor circuit for telephone sets |
DE3322642A1 (en) * | 1983-06-23 | 1985-01-24 | Siemens AG, 1000 Berlin und 8000 München | Hybrid circuit for telephone stations with amplifiers |
-
1985
- 1985-04-03 DE DE19853512327 patent/DE3512327A1/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2117291B2 (en) * | 1970-04-10 | 1978-06-15 | International Standard Electric Corp., New York, N.Y. (V.St.A.) | Telephone for four-wire connection |
DE2354539A1 (en) * | 1972-11-03 | 1974-05-09 | Kapsch Telephon Telegraph | CIRCUIT ARRANGEMENT FOR ELECTRIC DIRECT CURRENT PULSE BUTTONS |
DE2927474A1 (en) * | 1978-09-20 | 1980-04-03 | Siemens Ag | Supply circuit for pushbutton selection keyboard - is used in telephone pulsed selection and has voltage divider, energy store and depletion FET |
DE3223607A1 (en) * | 1982-06-24 | 1983-12-29 | Marko 11000 Belgrad Petrović | Hybrid transistor circuit for telephone sets |
DE3322642A1 (en) * | 1983-06-23 | 1985-01-24 | Siemens AG, 1000 Berlin und 8000 München | Hybrid circuit for telephone stations with amplifiers |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3612823A1 (en) * | 1986-04-14 | 1987-10-15 | Deutsche Telephonwerk Kabel | Circuit arrangement for feeding electrically erasable and programmable non-volatile memories in telephone terminals |
DE3628996A1 (en) * | 1986-08-26 | 1988-03-10 | Krone Ag | CIRCUIT ARRANGEMENT FOR A TELEPHONE |
EP0417977A2 (en) * | 1989-09-15 | 1991-03-20 | Mars Incorporated | Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone |
EP0417977A3 (en) * | 1989-09-15 | 1992-05-20 | Mars Incorporated | Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone |
US5216710A (en) * | 1991-01-07 | 1993-06-01 | Winbond Electronics Corp. | Liquid crystal display driver and power supply |
Also Published As
Publication number | Publication date |
---|---|
DE3512327C2 (en) | 1987-11-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |