EP0087541A1 - Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung - Google Patents

Stromversorgungsschaltung und eine Übertragungsvorrichtung mit dieser Schaltung Download PDF

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Publication number
EP0087541A1
EP0087541A1 EP82430005A EP82430005A EP0087541A1 EP 0087541 A1 EP0087541 A1 EP 0087541A1 EP 82430005 A EP82430005 A EP 82430005A EP 82430005 A EP82430005 A EP 82430005A EP 0087541 A1 EP0087541 A1 EP 0087541A1
Authority
EP
European Patent Office
Prior art keywords
voltage
power supply
supply device
capacitor
circuit
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
EP82430005A
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English (en)
French (fr)
Other versions
EP0087541B1 (de
Inventor
Gérard Orengo
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.)
Compagnie IBM France SAS
International Business Machines Corp
Original Assignee
Compagnie IBM France SAS
International Business Machines Corp
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 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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Classifications

    • 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

  • European patent application 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 for its transmission is supplied by an emergency power source constituted by a battery of capacitors which will 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 storage capacitors energy are gradually 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 data frequency band.
  • the subject of the present invention is a back-up power source which can be used for a relatively long period of time thanks to the presence of means making it possible to adjust at will the position relative to a given reference potential of the potential difference available to the floating power source terminals.
  • the invention relates to means making it possible to position at will the difference in potential appearing sant at the terminals of a floating energy source (not connected to ground), said means comprising: reference means for generating from said potential difference a reference voltage and voltage follower means connected to said means reference and to a fixed voltage source, said voltage follower means acting on the positioning of said potential difference so as to force said reference voltage at said fixed voltage.
  • FIG. 1 shows an embodiment of the device of the prior art.
  • This device includes two capacitors C1 and C2 intended to store the energy reserve.
  • the capacitor Cl is connected on the one hand to ground and on the other hand to a positive power source V + through a switch Il and a diode Dl.
  • the capacitor C2 is connected to ground on the one hand and to a negative power source V - through a diode D2 and a switch I2 on the other.
  • Capacitors C1 and C2 are also connected to an alarm signal generator 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 further comprises so-called charge control 12 and discharge control circuits 14.
  • the circuit 12 keeps the switches 11 and 12 closed, while the 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 Il 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 capacitors C1 and C2 discharge, 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 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 allows in particular, 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 3 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.
  • Il and 12 are closed, i.e. during the charging period, the capacitor C charges to a value where V d represent the voltage drops due to the diodes Dl and D2.
  • Il and I2 are open while 13 and 14 are closed as was the case for the circuit of Figure 1.
  • 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 're f 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 refocusing of the ten zion across 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
  • V ' ref 0
  • 1 ⁇ 2
  • remains constant during discharge and the two curves converge towards V ' ref at the same time.
  • 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 6. This consumption is minimized in practice by choosing a reference circuit of relatively high impedance, of the order of 50 K ⁇ for example.
  • FIG. 4 shows the block 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 cathode of T2 is connected to the electrode of the negatively charged capacitor C.
  • the point common to the resistors RI, R2 is connected to the bases of the transistors Tl and T2. This common point is that providing the voltage designated by V ref .
  • Transistors T3 and T 4 fulfill the functions of switches 13 and 14 respectively.
  • the switches Il and I2 (not shown) are open, while T5 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 in FIG. 4.
  • the assembly Tl, 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 Zl, 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.
  • the terminals supplying the standby voltages designated by V c + and Vc- in FIG. 4 have been designated by DRV + and DRV -
  • two other outputs have been provided, respectively designated by OSC and OSC - and 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 T10 and of the Darlington assembly T16, T17, T18. The DRV + and DRV - outputs are energized, which has several consequences. First of all, the line drive circuit is supplied, therefore ready to emit 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 is therefore supplied by DRV + via D24, Zl, 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)
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)

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

Family

ID=8189976

Family Applications (1)

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

Country Status (4)

Country Link
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0018517A1 (de) * 1979-05-03 1980-11-12 International Business Machines Corporation Diagnose- und Alarm-Vorrichtung für ein Datenfernmeldenetz

Family Cites Families (3)

* 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
JPS5028619B1 (de) * 1971-06-30 1975-09-17
JPS5512247U (de) * 1978-07-07 1980-01-25

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0018517A1 (de) * 1979-05-03 1980-11-12 International Business Machines Corporation Diagnose- und Alarm-Vorrichtung für ein Datenfernmeldenetz

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONIC ENGINEERING, vol.50, no.603, mars 1978, Londres (GB) *
IBM TECHNICAL DISCLOSURE BULLETIN, vol.14, no.1, juin 1971, New York (US) *

Also Published As

Publication number Publication date
JPS58154020A (ja) 1983-09-13
DE3279671D1 (en) 1989-06-08
EP0087541B1 (de) 1989-05-03
US4482815A (en) 1984-11-13

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