FR2492187A1 - Instantaneous voltage supply to telecommunications load - avoids corruption of early data and uses Zener diode with parallel transistor circuits and reservoir capacitor to ensure instant access - Google Patents

Instantaneous voltage supply to telecommunications load - avoids corruption of early data and uses Zener diode with parallel transistor circuits and reservoir capacitor to ensure instant access Download PDF

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Publication number
FR2492187A1
FR2492187A1 FR8022081A FR8022081A FR2492187A1 FR 2492187 A1 FR2492187 A1 FR 2492187A1 FR 8022081 A FR8022081 A FR 8022081A FR 8022081 A FR8022081 A FR 8022081A FR 2492187 A1 FR2492187 A1 FR 2492187A1
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FR
France
Prior art keywords
current
circuit
reservoir capacitor
zener diode
transistor
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
Application number
FR8022081A
Other languages
French (fr)
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FR2492187B1 (en
Inventor
Emmanuel Lefort
Gilbert Marie Marcel Ferrieu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecommunications Radioelectriques et Telephoniques SA TRT
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Telecommunications Radioelectriques et Telephoniques SA TRT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to FR8022081A priority Critical patent/FR2492187A1/en
Publication of FR2492187A1 publication Critical patent/FR2492187A1/en
Application granted granted Critical
Publication of FR2492187B1 publication Critical patent/FR2492187B1/fr
Granted legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems

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  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The constant voltage supply circuit provides instant voltage supply to a telecommunications circuit to avoid corruption of early bits of the data sequence by supply voltage fluctuation. The DC supply (5) is connected to the supply input terminals (7,8) and a current immediately flows through a double diode (28) and resistor (20) connected in series with a zener diode (12). The zener diode is connected in parallel with the load (1) output terminals (2,3) and regulates the output voltage. The resistor (20) acts as a current shunt, having the base and emitter of a transistor (21) connected across it. If the current passes a threshold value the transistor conducts, supplying additional load current which is drawn through the base of a second transistor (25) which delivers charging current to a reservoir capacitor (10) connected, through a diode (14), across the load terminals.

Description

DISPOSITIF DESTINE A ALIMENTER INSTANTANEMENT UN CIRCUIT DE CHARGE
CONNECTE A SES BORNES DE SORTIE DES QU'UNE SOURCE D'ALIMENTATION
EST CONNECTEE A SES BORNES D'ENTREE
L'invention concerne un dispositif-destiné à alimenter instantanément un circuit de charge connecté à ses bornes de sortie dès qu'une source d'alimentation est connectée à ses bornes d'entrée alors qu'il est prévu un condensateur-réservoir pour pallier les défaillances de la tension aux bornes d'entrée.DEVICE FOR INSTANTLY SUPPLYING A LOAD CIRCUIT
CONNECTED TO ITS OUTPUT TERMINALS AS A SUPPLY SOURCE
IS CONNECTED TO ITS TERMINALS
The invention relates to a device-intended to instantly supply a load circuit connected to its output terminals as soon as a power source is connected to its input terminals while a capacitor-tank is provided to overcome the voltage failures at the input terminals.

Ce dispositif trouve d'importantes applications, notamment il peut être utilisé dans les appareils téléphoniques d'abonnés comportant un microprocesseur pour assurer la gestion de l'appareil. This device finds important applications, in particular it can be used in subscribers' telephone apparatuses comprising a microprocessor to ensure the management of the apparatus.

Il faut donc que cette gestion commence à La mise en route de l'appareil, provoquée, par exemple, par le décrochage d'un combiné ; il importe alors que le microprocesseur soit aussitôt téléalimenté par la batterie centrale située dans Le central de commutation auquel est rattaché l'appareil d'abonné. On souhaite de plus que la tension d'alimentation du microprocesseur soit filtrée pour que les fluctuations ou même des absences de courte durée de la tension fournie par ladite source perturbent le moins possible le fonctionnement du microprocesseur.This management must therefore begin when the device is started up, caused, for example, by picking up a handset; it is therefore important that the microprocessor be immediately powered by the central battery located in the switching center to which the subscriber device is attached. It is further desired that the supply voltage of the microprocessor be filtered so that fluctuations or even short-term absences of the voltage supplied by said source disturb the operation of the microprocessor as little as possible.

Ces deux exigences consistant, d'une part, à alimenter instantanément le microprocesseur et, d'autre part, à assurer le filtrage sont apparemment contradictoires. En effet, dans les dispositifs classiques, la capacité réservoir est branchée en tampon sur les bornes d'alimentation du circuit de charge, de sorte que l'apparition de la tension n' a lieu que Lorsque Le condensateurréservoir est chargé. These two requirements consisting, on the one hand, of instantaneously supplying the microprocessor and, on the other hand, of ensuring filtering are apparently contradictory. In fact, in conventional devices, the reservoir capacity is connected as a buffer to the supply terminals of the charging circuit, so that the appearance of the voltage takes place only when the reservoir capacitor is charged.

L'invention propose un dispositif du genre mentionné qui satisfait, dans une grande mesure, les exigences précitées. The invention provides a device of the kind mentioned which satisfies, to a large extent, the aforementioned requirements.

Pour cela, un tel dispositif est remarquable en ce qu'il comporte un circuit à tension constante connecté entre les deux bornes de sortie et inséré dans deux trajets de courant, un premier allant d'une borne d'entrée à l'autre et un deuxième allant d'une armature du condensateur-réservoir à l'autre, et en ce qu'il comporte en outre un circuit de séparation inséré dans le deuxième trajet de courant, entre Le circuit à tension constante et le condensateur-réservoir, un circuit de mesure de courant inséré dans le premier trajet de courant et un circuit de dérivation commandé par le circuit de mesure de courant pour dériver du courant de la source d'alimentation vers Le condensateur-réservoir dès que le courant mesuré dépasse une certaine valeur. For this, such a device is remarkable in that it comprises a constant voltage circuit connected between the two output terminals and inserted in two current paths, a first going from one input terminal to the other and a second going from one armature of the reservoir capacitor to another, and in that it further comprises a separation circuit inserted in the second current path, between the constant voltage circuit and the reservoir capacitor, a circuit current measurement circuit inserted in the first current path and a bypass circuit controlled by the current measurement circuit to derive current from the power source to the reservoir capacitor as soon as the measured current exceeds a certain value.

La description suivante faite en regard du dessin annexé, le tout donné à titre d'exemple non limitatif, fera bien comprendre comment l'invention peut être réalisée. The following description given with reference to the appended drawing, all given by way of nonlimiting example, will make it clear how the invention can be implemented.

La figure 1, unique, représente un dispositif conforme à l'invention. Figure 1, unique, shows a device according to the invention.

Le dispositif montré à la figure 1 permet d'alimenter un circuit de charge 1 connecté à ses bornes de sortie 3 et 4, à partir d'une source de tension 5 connectée à ses bornes d'entrée 7 et 8. Pour filtrer des fluctuations ou meme des interruptions brèves de la tension aux bornes 7 et 8, il est prévu un condensateur-réservoir 10. The device shown in FIG. 1 makes it possible to supply a load circuit 1 connected to its output terminals 3 and 4, from a voltage source 5 connected to its input terminals 7 and 8. To filter fluctuations or even brief interruptions of the voltage at terminals 7 and 8, a capacitor-tank 10 is provided.

Conformément à l'invention, le dispositif comporte un circuit à tension constante constitué par une diode zéner 12 connectée entre les bornes 3 et 4 et insérée dans deux trajets de courant, un premier 11 allant de la borne 7 à La borne 8 et un deuxième I2 allant d'une première armature du condensateur-réservoir 10 à l'autre armature ; le dispositif de l'invention comporte en outre un circuit de séparation constitué par une diode 14 fixant le sens du courant de ce deuxième trajet ; l'anode de cette diode est connectée à la première armature du condensateur-réservoir 10 et La cathode à la cathode de la diode zéner 12.Le dispositif comporte aussi un circuit de mesure de courant formé par une résistance 20 parcourue par le courant rl et par un transistor 21 dont la base est reliée à une première extrémité de la résistance 20 et l'émetteur à La deuxième extrémité et enfin un circuit de dérivation formé par un transistor 25 dont le trajet de courant principal connecte la borne d'entrée 7 à la première armature du condensateurréservoir 10; la base de ce transistor 25 est reliée au collecteur du transistor 21 pour qu'un courant soit dérivé de la source d'alimentation 5 vers le condensateur-réservoir 10, dès que le courant I1 dépasse une certaine valeur Im, cette certaine valeur est telle qu'elle provoque, aux extrémités de la résistance 20, une chute de tension rendant conducteur le transistor 21.On a prévu des diodes 28 insérées dans le premier trajet de courant 11. Elles sont disposées dans le sens du courant T1 et branchées entre l'émetteur du transistor 25 qui est connecté à la borne 7 et la base du transistor 21. According to the invention, the device comprises a constant voltage circuit constituted by a zener diode 12 connected between terminals 3 and 4 and inserted in two current paths, a first 11 going from terminal 7 to terminal 8 and a second I2 going from a first frame of the reservoir capacitor 10 to the other frame; the device of the invention further comprises a separation circuit constituted by a diode 14 fixing the direction of the current of this second path; the anode of this diode is connected to the first armature of the reservoir capacitor 10 and the cathode to the cathode of the zener diode 12. The device also includes a current measurement circuit formed by a resistor 20 traversed by the current rl and by a transistor 21 whose base is connected to a first end of the resistor 20 and the emitter to the second end and finally a branch circuit formed by a transistor 25 whose main current path connects the input terminal 7 to the first armature of the reservoir capacitor 10; the base of this transistor 25 is connected to the collector of transistor 21 so that a current is derived from the power source 5 towards the capacitor-reservoir 10, as soon as the current I1 exceeds a certain value Im, this certain value is such that it causes, at the ends of the resistor 20, a voltage drop making the transistor 21 conductive. Diodes 28 are provided inserted in the first current path 11. They are arranged in the direction of the current T1 and connected between the emitter of transistor 25 which is connected to terminal 7 and the base of transistor 21.

Les diodes assurent une polarisation convenable des transistors 25 et 21. L'anode de la diode zéner est branchée, d'une part, aux bornes 4 et 8 et, d'autre part, à la seconde armature du condensateurréservoir 10 dont la première est reliée au collecteur du transistor 25. La cathode de la diode 12 est connectée à la borne 3 et à l'émetteur du transistor 20.The diodes provide suitable polarization of the transistors 25 and 21. The anode of the zener diode is connected, on the one hand, to terminals 4 and 8 and, on the other hand, to the second armature of the reservoir capacitor 10 of which the first is connected to the collector of transistor 25. The cathode of diode 12 is connected to terminal 3 and to the emitter of transistor 20.

Le dispositif de l'invention fonctionne de la manière suivante. The device of the invention operates in the following manner.

Dès que la source d'alimentation est branchée aux bornes 7 et 8, la diode zéner 12 est parcourue par un courant T1 au moins suffisant pour que la tension de zéner apparaisse. Lejcircuit de charge 1 est alors alimenté. Si le courant Il est inférieur à une certaine valeur Im telle que :
v
Im < VBE
R20 où VBE est la tension pour rendre conducteur le transistor 21 et
R20 la valeur ohmique-de la résistance 20, te transistor 21 est bloqué, ainsi que le transistor 25 ; le condensateur 10 ne se charge pas. As soon as the power source is connected to terminals 7 and 8, the zener diode 12 is traversed by a current T1 at least sufficient for the zener voltage to appear. The charging circuit 1 is then supplied. If the current Il is less than a certain value Im such that:
v
Im <VBE
R20 where VBE is the voltage to make the transistor 21 conductive and
R20 the ohmic value of the resistor 20, the transistor 21 is blocked, as well as the transistor 25; the capacitor 10 does not charge.

Si le courant Il < Im, Les transistors 21 et 25 deviennent conducteurs et le condensateur se charge. Il apparaît une tension aux armatures du condensateur 10 qui excède une tension qui est la somme de la tension de zéner de la diode 12 et de La tension en sens direct de la diode 14, un courant 2 différent de zéro circule alors dans ce deuxième trajet. Ce deuxième courant peut assurer l'apparition de la tension zéner de la diode 12, même si le courant
Il diminue ou disparaît. If the current Il <Im, the transistors 21 and 25 become conductive and the capacitor charges. A voltage appears on the armatures of the capacitor 10 which exceeds a voltage which is the sum of the zener voltage of the diode 12 and the forward voltage of the diode 14, a current 2 other than zero then flows in this second path . This second current can ensure the appearance of the zener voltage of the diode 12, even if the current
It decreases or disappears.

Claims (5)

REVENDICATIONS 1. Dispositif destiné à alimenter instantanément un circuit de charge connecté à ses bornes de sortie dès qu'une source d'alimentation est connectée à ses bornes d'entrée, alors qu'il est prévu un condensateur-réservoir pour pallier les défaillances de la tension aux bornes-d'entrée, caractérisé en ce qu'il comporte un circuit à tension constante connecté entre les deux bornes de sortie et inséré dans deux trajets de courant, un premier courant allant d'une des bornes d'entrée à L'autre et un deuxième allant d'une armature du condensateur-réservoir à L'autre, et en ce qutil comporte en outre un circuit de séparation inséré dans le deuxième trajet de courant, entre Le circuit à tension constante et le condensateur-réservoir, un circuit de mesure de courant inséré dans le premier trajet de courant et un circuit de dérivation commandé par le circuit de mesure de courant pour dériver du courant de ta source d'aLimentation vers le condensateur-réservoir dès que le courant mesuré dépasse une certaine valeur.1. Device intended to instantly supply a load circuit connected to its output terminals as soon as a power source is connected to its input terminals, while a capacitor-tank is provided to overcome the failures of the voltage at the input terminals, characterized in that it comprises a constant voltage circuit connected between the two output terminals and inserted in two current paths, a first current going from one of the input terminals to L ' another and a second going from one armature of the reservoir capacitor to the other, and in that it further comprises a separation circuit inserted in the second current path, between the constant voltage circuit and the reservoir capacitor, a current measurement circuit inserted in the first current path and a bypass circuit controlled by the current measurement circuit to derive current from your power source to the reservoir capacitor as soon as the measured current exceeds a certain value. 2. Dispositif selon la revendication 1, caractérisé en ce que le circuit à tension constante est une diode zéner.2. Device according to claim 1, characterized in that the constant voltage circuit is a zener diode. 3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le circuit de séparation est une diode.3. Device according to claim 1 or 2, characterized in that the separation circuit is a diode. 4. Dispositif selon L'une des revendications t à 3, caractérisé en ce que le circuit de mesure de courant est constitué par une résistance parcourue par le courant à mesurer et par un transistor dont les électrodes d'entrée sont connectées aux extrémités de la résistance.4. Device according to one of claims t to 3, characterized in that the current measurement circuit consists of a resistance traversed by the current to be measured and by a transistor whose input electrodes are connected to the ends of the resistance. 5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que le circuit de dérivation est formé par un transistor dont le trajet de courant principal interconnecte les bornes d'entrée avec le condensateur-réservoir et dont l'électrode de commande est reliée à la sortie du circuit de mesure de courant. 5. Device according to one of claims 1 to 4, characterized in that the bypass circuit is formed by a transistor whose main current path interconnects the input terminals with the reservoir capacitor and whose control electrode is connected to the output of the current measurement circuit.
FR8022081A 1980-10-15 1980-10-15 Instantaneous voltage supply to telecommunications load - avoids corruption of early data and uses Zener diode with parallel transistor circuits and reservoir capacitor to ensure instant access Granted FR2492187A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8022081A FR2492187A1 (en) 1980-10-15 1980-10-15 Instantaneous voltage supply to telecommunications load - avoids corruption of early data and uses Zener diode with parallel transistor circuits and reservoir capacitor to ensure instant access

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8022081A FR2492187A1 (en) 1980-10-15 1980-10-15 Instantaneous voltage supply to telecommunications load - avoids corruption of early data and uses Zener diode with parallel transistor circuits and reservoir capacitor to ensure instant access

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FR2492187A1 true FR2492187A1 (en) 1982-04-16
FR2492187B1 FR2492187B1 (en) 1984-10-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225069A3 (en) * 1985-11-28 1988-07-20 Stc Plc Telephone power supply

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009127A1 (en) * 1978-09-15 1980-04-02 Siemens Aktiengesellschaft Circuit for a line-fed loudspeaking telephone station

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009127A1 (en) * 1978-09-15 1980-04-02 Siemens Aktiengesellschaft Circuit for a line-fed loudspeaking telephone station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225069A3 (en) * 1985-11-28 1988-07-20 Stc Plc Telephone power supply

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Publication number Publication date
FR2492187B1 (en) 1984-10-05

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