NO324300B1

NO324300B1 - Switching device for decentralized power supply

Info

Publication number: NO324300B1
Application number: NO19970570A
Authority: NO
Inventors: Hans-Juergen Neuhaus
Original assignee: Detewe Systems Gmbh
Priority date: 1996-02-08
Filing date: 1997-02-07
Publication date: 2007-09-17
Also published as: DE19604503B4; DE59611301D1; EP0789478A2; NO970570L; DK0789478T3; DE19604503A1; ATE311072T1; ES2253745T3; NO970570D0; EP0789478A3; EP0789478B1

Abstract

The circuit includes several transistor switches for controlling routing of supply voltage (T1,T7), for a current sensor switch (T2,T6), and a current sensor (T4,T5) for each subscriber line (a,b). The transistor switches are operated by a control mechanism (MC) which reduces the no-load current of unused subscriber lines. A number of subscriber lines are switchable over further outputs (A2-CN) of the control mechanism. Resistances (R1,R2) of the transistor switch for the supply voltage preferably form a sensor current source for the subscriber lines together with further transistors (T1,T3).

Description

Oppfinnelsen angår en koblingsanordning til desentral strømforsyning i telekommunikasjonsanlegg for mating av analogt og/eller digitalt styrte terminaler over et abonnentgrensesnitt. The invention relates to a connection device for decentralized power supply in telecommunications facilities for feeding analogue and/or digitally controlled terminals over a subscriber interface.

Allment blir terminaler i offentlige telefonnett fjernmatet over abonnent-apparatledningene. I telekommunikasjonsanlegg, f.eks. hussentraler, overtas matingen av en av fjernmatingen uavhengig likespenningskilde. For en slik mating er det foreslått forskjellige fremgangsmåter (DE 33 11 386 C2, Generally, terminals in public telephone networks are fed remotely over the subscriber equipment lines. In telecommunications facilities, e.g. house switchboards, the supply is taken over by one of the remote supply's independent DC voltage sources. Various methods have been proposed for such feeding (DE 33 11 386 C2,

EP 339 201 Bl). Alle disse fremgangsmåter benytter som regel sentrale, relativt kostbare abonnentmatekoblinger som krever tilsvarende kjøletiltak og ofte kan heller ikke i hviletilstanden av apparatet kan gjennomføre den etter behov mulige reduksjon av energitilførselen. EP 339 201 Bl). As a rule, all these methods use central, relatively expensive subscriber feed connections which require corresponding cooling measures and often cannot even in the rest state of the device be able to implement the possible reduction of the energy supply as needed.

DE-2939008 omhandler en koblingsanordning for strømforsyning i et telekommunikasjonsanlegg for mating av analogt styrte terminaler over et grensesnitt. Videre inngår en av en kontrollenhet kontrollert bryter for matespenningen, for en sensorbryter og en strømsensor til hver apparatledning for reduksjon av hvilestrømmen ved ikke-belagt apparatledning. Ved hjelp av kontrollenheten kan et flertall apparatledninger svitsjes over ytterligere utganger. DE-2939008 relates to a switching device for power supply in a telecommunications system for feeding analogue controlled terminals over an interface. Furthermore, a control unit controlled switch for the supply voltage is included, for a sensor switch and a current sensor for each device cable to reduce the quiescent current in case of non-coated device cable. With the help of the control unit, a majority of device cables can be switched over additional outputs.

Hensikten med den foreliggende oppfinnelsen er å angi en koblingsanordning som ved desentralisering av abonnentmatekoblingene oppnår en fordeling av matetapseffekten og således mest mulig kan gi fullstendig avkall på kjøletiltak. Hermed samt med bruk av standardkomponenter skal arbeidet og kostnadene reduseres i betraktelig grad. Videre skal muligheten for etter behov å tilføre terminalen i hviletilstand mindre energi være inkludert. The purpose of the present invention is to specify a switching device which, by decentralizing the subscriber feed connections, achieves a distribution of the feed loss effect and can thus completely dispense with cooling measures as much as possible. With this, as well as with the use of standard components, the work and costs should be reduced to a considerable extent. Furthermore, the possibility of adding less energy to the terminal in its resting state should be included.

Denne hensikt oppnås ved at en strømforsyningsinnretning har en av en kontrollenhet betjent transistorkobling for matespenningen, for sensorstrømbryteren og for en strømsensor til hver port for reduksjon av hvilestrømmen ved ikke-belagt apparatledning, og at en rekke porter over ytterligere utganger kan svitsjes ved hjelp av styringen. Ytterligere fordelaktige tiltak fremgår av de uselvstendige krav. This purpose is achieved in that a power supply device has a transistor connection operated by a control unit for the supply voltage, for the sensor current switch and for a current sensor for each port to reduce the quiescent current in the case of uncoated device cable, and that a number of ports over additional outputs can be switched using the control . Further beneficial measures appear from the non-independent requirements.

Koblingsanordningen tjener til optimal reduksjon av den energi som skal mates inn i abonnentledningene og til reduksjon av tapseffekten ved matespenningsbryteren. The switching device serves to optimally reduce the energy to be fed into the subscriber lines and to reduce the loss effect at the supply voltage switch.

Oppfinnelsen skal i det følgende forklares nærmere i tilknytning til blokkdiagrammet. In the following, the invention will be explained in more detail in connection with the block diagram.

Strømforsyningsinnretningen består av en kontrollenhet MC, f.eks. en mikrodatamaskin, samt for hver port av en strømsensor, en sensorstrømbryter og en matespenningsbryter. I den viste koblingsanordning er det som abonnentgrensesnitt TS vist en totråds motstandsmating med en signalkomponent U. Strømforsyningen kan imidlertid like gjerne benyttes til mating av analoge og/eller digitale terminaler over totråds- eller firetrådsgrensesnitt. The power supply device consists of a control unit MC, e.g. a microcomputer, as well as for each port a current sensor, a sensor current switch and a supply voltage switch. In the shown connection device, a two-wire resistance feed with a signal component U is shown as the subscriber interface TS. The power supply can, however, just as easily be used for feeding analogue and/or digital terminals via two-wire or four-wire interfaces.

Som sentral matespenningsbryter benyttes transistoren Tl. Transistoren Tl blir over en styretransistor T7 etter behov koblet inn og ut av kontrollenheten MC. I utkoblet tilstand av transistoren Tl utgjør de seriekoblede motstander RI og R2 sammen med transistorene T3 og Tl en sensorstrømkilde som detekterer en sløyfetilkobling på grenene a, b. The transistor Tl is used as the central supply voltage switch. The transistor Tl is switched in and out by the control unit MC via a control transistor T7 as required. In the disconnected state of the transistor Tl, the series-connected resistors RI and R2 together with the transistors T3 and Tl constitute a sensor current source which detects a loop connection on the branches a, b.

Omkoblingen av en redusert sensorstrøm til størrelsen av den av den tilkoblede terminal og på grenene a, b nødvendige sløyfestrøm blir av kontrollenheten MC gjennomført over transistoren T6. Transistoren T6 styrer den etteranordnede transistor T2 til ledende tilstand, slik at motstanden RI overkobles. I denne driftsmode arbeider motstanden R2 og transistoren T3 som overstrømvern til beskyttelse av transistoren Tl i matespenningsbryteren. The switching of a reduced sensor current to the size of the loop current required by the connected terminal and on the branches a, b is carried out by the control unit MC via the transistor T6. The transistor T6 controls the subsequently arranged transistor T2 to the conducting state, so that the resistance RI is switched. In this operating mode, the resistor R2 and the transistor T3 work as overcurrent protection to protect the transistor Tl in the supply voltage switch.

Den nødvendige sløyfestrøm er innstilt ved hjelp av motstanden R3. Overskrider sløyfestrømmen den av motstanden R3 bestemte terskel, kobles transistoren T4 til aktiv tilstand og signaliserer dette over terskelomformeren T5 til kontrollenheten MC. Kondensatoren C forhindrer i dette tilfelle retureffekter fra strømforsyningsinnretningen på abonnentgrensesnittet TS. Ved denne signalisering kan f.eks. matespenningsbryteren Tl kobles ut. Over kontrollenheten MC kan transistorbryteren over de antydede utganger A2...CN styre flere apparatledninger, idet det for hver apparatledning er anordnet en bryter for matespenningen, en strømsensor og etter behov en sensorstrømbryter. The required loop current is set using resistor R3. If the loop current exceeds the threshold determined by the resistor R3, the transistor T4 is switched to the active state and signals this via the threshold converter T5 to the control unit MC. In this case, the capacitor C prevents return effects from the power supply device on the subscriber interface TS. With this signaling, e.g. the supply voltage switch Tl is switched off. Above the control unit MC, the transistor switch via the indicated outputs A2...CN can control several appliance lines, as for each appliance line there is a switch for the supply voltage, a current sensor and, if necessary, a sensor current switch.

Koblingsanordningen kan etter behov også utføres symmetrisk. If necessary, the coupling device can also be designed symmetrically.

Claims

1. Switching device for local power supply in telecommunications facilities for feeding analogue and/or digitally controlled terminals over a user network interface (TS), with a control unit (MC) which is connected via a plurality of signal inputs (Cl ... CN) and a plurality signal outputs (Al ... AN, Bl ... BN) to the terminals that have a connection line (a, b), and which for each connection line (a, b) to a terminal are made so that: - a first signal output (Bl ... BN) is used to operate transistor switch (Tl, T7) for the supply voltage to the terminals, which transistor switch one comprises a switching transistor (Tl) having a collector-emitter path having a first and second resistance (RI, R2) connected in series with it, which in combination with the switching transistor (T1) and a sensing transistor (T3) forms a sensing current source when the switching transistor is on, said sensing current source producing a reduced supply current in the connection lines (a, b) when the connection lines (a, b) are not in b ruk, - the signal input (Cl ... CN) connects it to a current sensor circuit (T4, T5) which outputs a signal to the controller (MC) both when the supply current is reduced and when a threshold value that has been set for the supply current is exceeded, and - it uses a second signal output (Al ... AN) to activate a sensor current disconnector (T2, T6) to switch over to reduced supply current to the size of the supply current required by the connected terminal when the connection lines (a, b) are in use.

2. Coupling device according to claim 1, characterized in that the collector-base junction of the sensor transistor (T3) is connected in parallel with the base-emitter junction of the switching transistor (Tl), and that the base-emitter junction of the sensor transistor (T3) is arranged in parallel with the series-connected first and second resistors (RI, R2).

3. Coupling device according to claim 1 or 2, characterized in that when the switching transistor (T1) of the transistor switch (T1, T7) to the supply voltage is on and the sensor current disconnector (T2, T6) has been activated, the second resistor (R2) together with the sensor transistor (T3) serves as an overcurrent limiter for the power supply .

4. Switching device according to one of the preceding claims, characterized in that the sensor current disconnector (T2, T6) contains a second transistor (T2) which is connected in parallel with the first resistor (RI) and which is made so that it forms a bridge with the first resistor (RI) when turned on by the sixth transistor (T6), which has a base connected to one of the outputs of the second signal output (Al ... AN) of the controller.

5. Switching device according to one of the preceding claims, characterized in that the threshold value of the supply current to address a current sensor transistor (T4) in the current sensor circuit (T4, T5) is set with the second resistor (R2) and a third resistor (R3) connected in series with the first resistor (RI) and a second resistor (R2) and in that the base-emitter junction of the current sensing transistor (T4) is arranged in parallel with the series-connected second and third resistors (R2, R3), and the collector of the current sensing transistor (T4) is connected to the base of a fifth transistor (T5) which serves as a level converter and which has a collector connected to the signal input (Cl ... CN) of the controller (MC).

6. Switching device according to one of the preceding claims, characterized in that the capacitor (C) is made so that it compensates for transmission-related influences of the circuit arrangement on the transistor switch (T1, T7) to the supply voltage.