EP0087541B1 - Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung - Google Patents

Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung Download PDF

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Publication number
EP0087541B1
EP0087541B1 EP82430005A EP82430005A EP0087541B1 EP 0087541 B1 EP0087541 B1 EP 0087541B1 EP 82430005 A EP82430005 A EP 82430005A EP 82430005 A EP82430005 A EP 82430005A EP 0087541 B1 EP0087541 B1 EP 0087541B1
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EP
European Patent Office
Prior art keywords
circuit
voltage
capacitor
switching means
power supply
Prior art date
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Expired
Application number
EP82430005A
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English (en)
French (fr)
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EP0087541A1 (de
Inventor
Gérard Orengo
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Compagnie IBM France SAS
International Business Machines Corp
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Compagnie IBM France SAS
International Business Machines Corp
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Application filed by Compagnie IBM France SAS, International Business Machines Corp filed Critical Compagnie IBM France SAS
Priority to DE8282430005T priority Critical patent/DE3279671D1/de
Priority to EP82430005A priority patent/EP0087541B1/de
Priority to JP57214787A priority patent/JPS58154020A/ja
Priority to US06/464,542 priority patent/US4482815A/en
Publication of EP0087541A1 publication Critical patent/EP0087541A1/de
Application granted granted Critical
Publication of EP0087541B1 publication Critical patent/EP0087541B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/577—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices for plural loads
    • G05F1/585—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices for plural loads providing voltages of opposite polarities

Definitions

  • the present invention relates to a power supply circuit and more specifically a circuit providing an emergency power supply.
  • European patent application EP-A-0 018 517 describes a diagnostic and alarm device for an on-line data communication network.
  • a predetermined tone alarm signal is generated and transmitted to a central station on a line normally used for data transmission.
  • the energy necessary for the production of the alarm tone and its transmission is supplied by an emergency power source consisting of a battery of capacitors which have been previously charged.
  • This system has a number of constraints. Indeed, the capacitors being generally all the more voluminous as they are of high value, it is preferable to limit the values of capacitors necessary to the strict minimum. However, this results in a limitation of the stored energy, which reduces the duration of the alarm tone that can be generated.
  • the receiver to which the alarm is transmitted can detect the presence of a signal which is not data and identify it in a relatively short time. Discrimination between alarm signal and data is made possible by the choice of a frequency of the alarm signal outside the pure data spectrum.
  • a sinusoidal alarm signal of 350 Hz of frequency has been chosen.
  • the energy storage condensers are progressively discharged and from a moment the signal that the device could generate would present distortions resulting in the presence of harmonics of pure frequency at 350 Hz
  • Some of these harmonics (1050, 1400, 1750, etc.) would be in the frequency band of the data.
  • the subject of the present invention is an alarm signal generator intended to generate a temporary signal of predetermined frequency, as defined in claim 1.
  • FIG. 1 shows an embodiment of the device of the prior art.
  • This device comprises two capacitors C1 and C2 intended to store the energy reserve.
  • the capacitor C1 is connected on the one hand to ground and on the other hand to a positive power source V + through a switch 11 and a diode D1.
  • the capacitor C2 is connected to earth on the one hand and to a negative power source V- through a diode D2 and a switch 12 on the other hand.
  • the capacitors C1 and C2 are also connected to a generator of alarm signals 10 (which they are responsible for supplying when the sources V + and V-are out of order) through switches (switching means) 13 and 14 respectively.
  • the circuit also comprises so-called charge control 12 and discharge control circuits 14.
  • the circuit 12 keeps the switches 11 and 12 closed, while circuit 14 keeps switches 13 and 14 open.
  • the system is in the so-called charging phase during which the capacitors C1 and C2 are charged while the alarm signal generator is at rest.
  • a so-called alarm cycle starts.
  • the circuit 12 controls the opening of the switches 11 and 12 while the switches 13 and 14 are closed under the effect of a command from the circuit 14.
  • the device 10 supplied by the energy stored in the capacitors C1 and C2, generates a signal at 350 Hz, called an alarm. During this operation, the condensa tors C1 and C2 are discharged, the voltages they deliver decrease.
  • the alarm generator 10 From certain levels of the voltages supplied by the capacitors C1 and C2, the alarm generator 10 delivers a distorted signal and therefore comprising harmonics of the frequency at 350 Hz. As indicated above, this is to be avoided . It is therefore necessary to stop the alarm generator 10 before the moment when the generated signal would be distorted. In practice, it sometimes happens that certain circuits of the alarm generator 10 need a negative voltage greater than the positive voltage. For example, for an alarm signal of ⁇ 2V peak-to-peak, the power circuits of the alarm generator 10 would require at least + 2.7V and -4.1V.
  • the charges of C1 and C2 can be done at + 8.65V and -6.95V respectively (what the zone shows left of t o on the diagram in the upper part of figure 2). From t o , it was assumed that one entered the operating zone of the alarm generator.
  • the curves VC1 and VC2 show diagrammatically symmetrical discharges of the capacitors C1 and C2 respectively. It will be noted that these constant current discharges have been assumed to simplify the presentation, but that this is by no means a constraint. For
  • the circuit of the invention makes it possible to minimize the effect of these asymmetries by using means making it possible to center the discharge zone at will. This refocusing will notably allow, in the case of FIG. 2, to extend the duration of the undistorted alarm signal up to t ' 2 . We will even see later that the result may even be even better than it appears in Figure 2.
  • FIG 3 shows a block diagram of the device of the invention.
  • Figures 1 and 2 bear similar references to designate similar elements.
  • the capacitors C1 and C2 have been replaced by a single floating capacitor C, that is to say, not connected to ground.
  • the capacitor C charges to a value where V d represent the voltage drops due to diodes D1 and D2.
  • a reference circuit 16 connected downstream of the switching means 13, 14 and on the other hand a voltage follower circuit 18.
  • the reference circuit builds a first reference voltage V ref based in particular on the voltages across capacitor C.
  • This reference voltage V ref is applied to one of the inputs of the voltage follower circuit 18.
  • the circuit 18 shown here schematically in the form of an operational amplifier operates so as to force V ref to the level a second reference voltage V ′ ref which is a fixed voltage applied to its output and to its other input. For example, if this voltage V ' ref is the ground, the circuit acts so as to cause V ref towards the voltage of the ground. This results in a recentering of the voltage across the capacitor C. This recentering can be controlled as desired.
  • the circuit of FIG. 3 can indeed supply two voltages V c + and V c - such that
  • the invention makes it possible, starting from a floating energy source, to center the voltage available at the terminals of said source at will with respect to a given reference potential.
  • the invention therefore makes it possible in particular to position the voltage of the source with respect to the ground potential.
  • circuit of the invention requires very little additional power compared to the circuit of the prior art.
  • the only effective additional consumption is that of the reference circuit 16. This consumption is minimized in practice by choosing a reference circuit of relatively high impedance, of the order of 50 KQ for example.
  • FIG. 4 shows the schematic diagram of an embodiment of the invention in which the voltage follower circuit is extremely simple.
  • the reference circuit 16 is here, quite simply, a divider bridge with two resistors R1 and R2 in series.
  • the function of the voltage follower circuit 18 it is here obtained by two transistors T1 and T2 in series.
  • the collector of T2 is connected to the electrode of the negatively charged capacitor C.
  • the point common to resistors R1, R2 is connected to the bases of transistors T1 and T2. This common point is that providing the voltage designated by V ref ⁇
  • the transistors T3 and T4 fulfill the functions of the switches 13 and 14 respectively.
  • the switches 11 and 12 (not shown) are open, while T4 is made conductive. This results in the conduction to saturation of the transistors T3 and T4.
  • the potential of capacitor C is found applied at A and B to the use circuit (not shown).
  • FIG. 5 shows a detailed embodiment of the invention using in particular circuit elements similar to those of the circuit of FIG. 4.
  • the assembly T1, T2 voltage follower has been replaced by two circuits of the Darlington type namely (T11, T12, R11) and (T13, T14, R12).
  • the reference circuit 16 comprises, in addition to the resistors R1 and R2, a set of diodes (D11, D12, D13, D14, D15 and D16) in series.
  • the base of transistor T14 is connected to the cathode of diode D13.
  • the base of transistor T12 is connected to the anode of diode D11 through a resistor R13 and to the cathode of this same diode through a resistor R14.
  • the function of the switch 13 is carried out by a circuit of the Darlington type comprising PNP transistors T16, T17 and T18 and a resistor R18.
  • the circuit elements T4, T5 and R ' occupy the same positions as their counterparts in the device shown in FIG. 4.
  • an additional divider bridge comprising diodes D17 to D20 in series with a Zener diode Z1, a resistor R17 and diodes D21 to D23, has been placed upstream of the switches 13 and 14.
  • a diode D24 is placed between the collector of transistor T18 and the cathode of diode D20.
  • the point common to the resistor R17 and to the anode of the diode D21 is connected to the base of the transistor T5 through a resistor R19.
  • This same base of transistor T5 is connected to the emitter of transistor T4 through a resistor R20.
  • an NPN transistor T15 is connected between the point common to R17 and to the diode D21 and the emitter of the transistor T4.
  • the back-up power supply control signal is applied to the base of transistor T15.
  • DRV + and DRV- the terminals providing the backup voltages designated by V c + and V r - in FIG. 4.
  • OSC + and OSC- taken upstream of switches 13 and 14.
  • the process of transmitting the alarm signal begins when the base of T15 is no longer supplied by an external command originating from a circuit (not shown) for detecting normal power failure. In this case, T15 is blocked and the current no longer being derived by T15 supplies the base of T5. There is then saturation of T14 and of the Darlington assembly T16, T17, T18. The DRV + and DRV- outputs are energized, which has several consequences. First, the line driver is supplied with power, ready to issue the alarm signal. In addition, the centering circuit is made active. Finally, the diode D24 becomes conductive and blocks the diodes D17 to D20. The control circuit T5 is therefore supplied by DRV + via D24, Z1, R17, R19 and R20.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Claims (5)

1. Alarmsignalgenerator, dafür bestimmt, ein kurz andauerndes, unverzerrtes Signal einer vorgegebenen Frequenz auszugeben, enthaltend:
(a) einen Notstromversorgungskreis, ausgehend von einer gleitenden Spannungsquelle Vc, die sich während der Benutzung entlädt, wobei besagter Versorgungskreis enthält:
einen vorher geladenen Kondensator (C), der die Aufgabe hat, die besagte Gleitspannung Vc abzugeben;
Versorgungsmittel, die die besagte Gleitspannung anhand von V abgeben, sowie vorher festgelegte Spannungen V c und Vc-, und die Entladung des Kondensateurs so steuern, dass die Verwendung während der Entladung der besagten Gleitspannungsquelle verlängert wird und dass zwischen Vc + und Vc- folgende Beziehung entsteht:
Figure imgb0006
wobei a und b vorgegebene Parameter ungleich Null sind; und besagte Versorgungsmittel enthalten:
eine sogenannte Spannungsfolgerschaltung; und
eine Bezugsschaltung, zwischen den Klemmen der Gleitspannungsquelle V eingesetzt und an den Eingang der Spannungsfolgerschaltung angeschlossen;
Schaltmittel zwischen den Klemmen des Kondensators (C) und den Klemmen der Bezugsspannung; und
eine Schaltung für die automatische Steuerung der Öffnung der Schaltmittel in Abhängigkeit vom Spannungspegel hinter den besagten Schaltmitteln; und
(b) einen Schwingkreis, der mit den vom besagten Versorgungskreislauf abgegebenen Spannungen Vc + und Vc- gespeist wird und das besagte kurz anhaltende unverzerrte Signal vorgegebener Frequenz abgibt.
2. Signalgenerator gemäss Anspruch 1, dadurch gekennzeichnet, dass er enthält:
Mittel für die Schaltung des besagten Schwingkreises vor den besagten Schaltmitteln; und
einen Verstärker des vom Schwingkreis abgegebenen Signals, wobei besagter Verstärker von den Spannungen gespeist wird, die vor den besagten Schaltmitteln abgegriffen werden.
3. Alarmsignalgenerator gemäss Anspruch 2, dadurch gekennzeichnet, dass besagte Bezugsschaltung durch eine erste Spannungsteilerbrücke mit durch mindestens eine Diode gentrennten Widerständen gebildet wird.
4. Alarmsignalgenerator gemäss Anspruch 3, dadurch gekennzeichnet, dass besagte Spannungsteilerbrücke nach den besagten Schaltmitteln angeschlossen ist.
5. Alarmsignalgenerator gemäss Anspruch 4, dadurch gekennzeichnet, dass besagte automatische Steuerschaltung umfasst:
eine zweite Spannungsteilerbrücke an den Klemmen des Kondensators (C) vor den Schaltmitteln,
eine Transistorschaltung, die die Schaltmittel steuert, Transistor, dessen Steuerelektrode an die besagte zweite Teilerbrücke gelegt ist; und Mittel für die gesteuerte Sperrung, an die zweite Teilerbrücke angeschlossen, um den Strom des Steuertransistors abzuleiten.
EP82430005A 1982-02-25 1982-02-25 Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung Expired EP0087541B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8282430005T DE3279671D1 (en) 1982-02-25 1982-02-25 Power supply circuit and transmission device using such a power supply circuit
EP82430005A EP0087541B1 (de) 1982-02-25 1982-02-25 Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung
JP57214787A JPS58154020A (ja) 1982-02-25 1982-12-09 電源回路
US06/464,542 US4482815A (en) 1982-02-25 1983-02-07 Floating back-up power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82430005A EP0087541B1 (de) 1982-02-25 1982-02-25 Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung

Publications (2)

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EP0087541A1 EP0087541A1 (de) 1983-09-07
EP0087541B1 true EP0087541B1 (de) 1989-05-03

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EP82430005A Expired EP0087541B1 (de) 1982-02-25 1982-02-25 Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung

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US (1) US4482815A (de)
EP (1) EP0087541B1 (de)
JP (1) JPS58154020A (de)
DE (1) DE3279671D1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675539A (en) * 1985-09-17 1987-06-23 Codex Corporation Backup power system
US5506775A (en) * 1993-05-20 1996-04-09 Kansei Corporation Power source circuit for an occupant protecting device of motor vehicles
KR0149584B1 (ko) * 1995-10-18 1999-04-15 김광호 전원전압 공급회로
DE19643014C1 (de) * 1996-10-18 1998-08-13 Telefunken Microelectron Bussystem zur elektronischen Energieversorgung
US5912513A (en) * 1997-11-14 1999-06-15 Lucent Technologies, Inc. Method and apparatus for reducing power dissipation in DC termination circuit
DE19930094A1 (de) * 1999-06-30 2001-01-04 Philips Corp Intellectual Pty Datenbus-Transmitter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1102552A (en) * 1964-09-16 1968-02-07 English Electric Co Ltd Power supply circuit for electrical protective relays
DE1563848A1 (de) * 1966-07-20 1970-08-06 Telefunken Patent Erdfreie Spannungsquelle
US3646428A (en) * 1970-11-27 1972-02-29 Bell Telephone Labor Inc Symmetrical voltage regulator
DE2116612A1 (de) * 1971-03-31 1972-10-12 Licentia Gmbh Schaltungsanordnung zum Abgleich des Temperaturkoeffizienten
JPS5028619B1 (de) * 1971-06-30 1975-09-17
JPS5512247U (de) * 1978-07-07 1980-01-25
FR2455827A1 (fr) * 1979-05-03 1980-11-28 Ibm France Dispositif de diagnostic et d'alarme pour un reseau de communication de donnees

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONIC ENGINEERING, vol.50, no.603, mars 1978, Londres (GB). D.J. BATTISON: "A differential power supply converter", page 19 *
IBM TECHNICAL DISCLOSURE BULLETIN, vol.14, no.1, juin 1971, New York (US). R.A. TENLEY: "Power line disturbance support circuit", pages 68, 69 *

Also Published As

Publication number Publication date
JPS58154020A (ja) 1983-09-13
EP0087541A1 (de) 1983-09-07
DE3279671D1 (en) 1989-06-08
US4482815A (en) 1984-11-13

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