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WO1991000637A1 - Dispositif d'alimentation en tension d'appareils electroniques - Google Patents

Dispositif d'alimentation en tension d'appareils electroniques Download PDF

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Publication number
WO1991000637A1
WO1991000637A1 PCT/DE1990/000363 DE9000363W WO9100637A1 WO 1991000637 A1 WO1991000637 A1 WO 1991000637A1 DE 9000363 W DE9000363 W DE 9000363W WO 9100637 A1 WO9100637 A1 WO 9100637A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
supply device
power supply
energy reserve
energy
Prior art date
Application number
PCT/DE1990/000363
Other languages
German (de)
English (en)
Inventor
Peter Taufer
Leonhard Boll
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1991000637A1 publication Critical patent/WO1991000637A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/017—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
    • 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
    • H02J9/061—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 for DC powered loads

Definitions

  • the invention relates to a voltage supply device for an electronic device, in particular a vehicle occupant protection device, such as an airbag, belt tensioner and / or the like, with an energy reserve which comes into operation in the event of a failure or a drop in an operating voltage, via an controllable switching means the protective device can be put on.
  • a vehicle occupant protection device such as an airbag, belt tensioner and / or the like
  • an energy reserve is required in the case of the protective device mentioned, in order to ensure the function of the system even if, for example, the connection to the operating Voltage of the vehicle, that is to say the on-board electrical system voltage provided by the vehicle battery, is interrupted.
  • the energy reserve has a storage device which then provides the energy required to trigger the protective device.
  • the energy reserve is preferably realized by means of an electrolytic capacitor.
  • a voltage supply device emerges from the unpublished German patent application P 38 28 990, in which, when the operating voltage drops, an energy reserve is connected to the protective device via a switching means. For safe operation of the protective device, it must always be ensured that the energy of the energy reserve is sufficient to trigger the protective device.
  • the voltage supply device with the features mentioned in the main claim has the advantage that, for a capacity test of the energy present in the energy reserve, the switching means connects the protective device which is in normal operation to the energy reserve, and that the energy taken from this results from the energy reserve is monitored / evaluated.
  • This capacitance test ensures that not only the charging voltage of the energy reserve can be determined, but also a dynamic current drain takes place, so that the available stored energy can be determined.
  • Tolerance tests of the components are thus detected, for example, so that a reliable prediction is always possible as to whether the energy made available by the energy reserve is sufficient for a triggering event.
  • the switching means thus takes on a double function in that, on the one hand, it connects the protective device to the energy reserve in the event of a failure or a drop in the operating voltage and, on the other hand, establishes a connection between the energy reserve and the protective device for the test purpose according to the invention, wherein - As usual - the current consumption of the safety device in normal operation is almost independent of the size of the voltage, so that an almost linear current draw from the energy reserve takes place. This makes it particularly easy to determine which amount of energy the energy reserve can make available by detecting the duration of the current flow. In addition, it can be determined how long the energy reserve is able to ensure that the protective device is ready for operation after the operating voltage (vehicle battery) has failed.
  • the switching means is designed as an electronic switch. This preferably has a transistor as a switching element.
  • the energy taken from the energy reserve for the test purpose according to the invention is preferably monitored by an evaluation circuit.
  • This can in particular be part of a microprocessor circuit of the protective device.
  • the energy reserve is connected to the operating voltage via a voltage converter.
  • the voltage converter is preferably designed as a step-up voltage converter.
  • the voltage converter has the task of raising the potential of the energy reserve to a value which is greater than the potential of the operating voltage. On the one hand, this ensures that the triggering voltage for the protective device is above a minimum value necessary for the triggering, and on the other hand ensures that the protective device is supplied with a voltage of sufficient magnitude even when the operating voltage drops.
  • the capacity test is only carried out when the voltage of the energy reserve is greater than the operating voltage.
  • the capacity test according to the invention it is not necessary for the energy reserve to be completely discharged for this purpose. Rather, it is sufficient to remove only a part of the stored energy. From this, conclusions can be drawn about the total energy content. If the operating voltage and the voltage of the energy reserve are each connected to the protective device via a diode connected in the forward direction, the capacitance test can be carried out without disconnecting the operating voltage, provided that the voltage of the energy reserve is greater than that of the operating voltage. The circuit arrangement described then ensures that energy is drawn only from the energy reserve, but not from the vehicle battery that provides the operating voltage, since this is provided by the associated Diode acting in the reverse direction can make no contribution.
  • the energy reserve is preferably connected to the protective device via the emitter-collector path of the transistor of the electronic switch.
  • the base of the transistor is preferably connected to the output of a comparator, to whose one, first input a reference voltage and to the other, second input a test voltage can be applied. If the test voltage is reduced to a value for the capacitance test that is lower than the reference voltage, the comparator controls the transistor in such a way that it assumes its conductive state.
  • the energy reserve is therefore connected to the protective device, so that the load test according to the invention can be carried out to determine the energy content of the energy reserve. Furthermore, the connectivity of the switching means is always tested in such a test.
  • the supply voltage is connected to the second input of the comparator. If the supply voltage drops below the reference voltage value, the comparator is switched through, so that a connection is again established between the energy reserve and the protective device. This function is important in the event that, in the event of an accident or the like, the vehicle battery is disconnected before the vehicle occupant protection device is triggered, e.g. through deformations.
  • the voltage of the energy reserve is specified by a voltage limiting element. This protects the energy storage of the energy reserve from overvoltages.
  • the energy store is preferably designed as an electrolytic capacitor. Furthermore, this provides additional protection with regard to failure or malfunction of a voltage control of the energy reserve, which is often implemented by software.
  • FIG. 1 shows a block diagram of a voltage supply device
  • FIG. 2 shows a detailed illustration of the voltage supply device according to FIG. 1.
  • FIG. 1 shows a circuit arrangement 1 which has a switching device 3, which is provided with switching means 2 and represents an electronic switch, and a voltage converter 4.
  • the switching device 3 has an input 5 to which an operating voltage U_ is connected via a diode D.
  • the operating voltage U is made available by the battery of a vehicle, not shown.
  • the positive pole of the battery is connected to the anode of the diode D-, while the cathode with the input 5 in Connection is established.
  • the negative pole of the operating voltage U_ is connected to ground 6.
  • An output 8 of the switching device 3 is connected to a connection point 7 via a further diode D 2 .
  • the diode D 2 is polarized in such a way that its cathode lies at the connection point 7.
  • connection point 7 is also connected to a protective device 9 for the occupants of a vehicle.
  • the protective device 9 is designed in particular as a restraint system such as an airbag, belt tensioner and / or the like.
  • an energy reserve 10 is provided, which is designed as a capacitor C.
  • One connection of the capacitor C is connected to ground 6, while the other connection is connected via a further connection point 11 and a line 12 to an input 13 of the switching device 3.
  • the switching device 3 is connected via a line 14 to the voltage converter 4, which has an output 15 which is connected to the connection point 11.
  • the switching means 2 of the switching device 3 is designed as a transistor T, the collector of which is connected to the anode of the diode D 2 .
  • the emitter of the transistor T is connected to the connection point 11 at which the capacitor C is located.
  • a resistor R- is provided, one connection of which lies at the connection point 11 and the other connection of which leads to the base of the transistor T.
  • the base is also connected to a Zener diode Z, the anode of which is connected to ground 6 lies.
  • the cathode of the Zener diode Z_ leads to a connection of a resistor R-, the other connection of which is connected to an output 16 of a comparator K.
  • the comparator K has a first input 17 at which a reference voltage U R - is present.
  • a second input 18 of the comparator K is connected to the operating voltage U 1 via a diode D, the operating voltage U_ being equal to the battery voltage U B .. of the vehicle battery.
  • the polarity of the diode is such that its cathode is located at the second input 18.
  • the second input 18 is also connected to the cathode of a further diode D. in connection, at the anode of which a test voltage U_. can be created.
  • the voltage supply device has the following function:
  • the protective device 9 for example in the form of an airbag, is supplied with electrical energy via the voltage lying between the connection point 7 and ground 6.
  • the energy reserve 10 is not required, since the supply is provided by the operating voltage U_ (vehicle battery).
  • the energy reserve is separated from the protective device 9 via the switching device designed as an electronic switch.
  • the capacitor C of the energy reserve 10 is charged or recharged to a certain energy level via the voltage converter 4. Its energy content is determined by the applied voltage and the capacity.
  • the charging voltage of the capacitor C is determined via the base-emitter
  • the voltage of the transistor T and the Zener diode Z_ are limited.
  • the comparator K switches to ground 6, as a result of which the transistor T is brought into its conductive state.
  • the capacitor C of the energy reserve 10 is thus connected to the protective device 9 via the conductive transistor T and the diode D 2 .
  • the protective device 9 is therefore supplied via the energy stored in the capacitor C.
  • the invention it is possible to test the energy content of the memory device 10 and the connectivity (function of the transistor T). For safety reasons, this test should be carried out at regular intervals. For this purpose, a test voltage U " t is applied to the diode D. This is smaller than the reference voltage U" -. As a result, the process already described above is repeated, that is to say the transistor T assumes its conductive state, so that the protective device 9 is supplied via the capacitor C. In normal operation, the current consumption of the protective device 10 is almost independent of the level of its supply voltage, so that when the electronic switch (transistor T) is switched on, an almost linear current draw from the energy reserve 10 takes place. This energy extraction is carried out in a state in which the voltage of the capacitor C is greater than the operating voltage U_. In this case, the diode D- blocks, so that the protective device 9 is supplied exclusively by the energy stored in the capacitor C.
  • the capacitor voltage drops in the test mode.
  • the energy content of the energy reserve 10 can be determined in a simple manner from the size of the current drawn and the change in the capacitor voltage over time. In particular, it is very easy to determine how long the energy reserve 10 is able to keep the protective device 9 ready for operation after the operating voltage U_ fails.
  • the evaluation of the test results is preferably carried out and interpreted by a microcomputer present in the protective device 9.
  • Another advantage is that the energy reserve 10 is withdrawn for testing purposes exactly that current which is also required in the event of a failure of the operating voltage in order to continue to supply the protective device 9. It can thus be checked individually for each unit whether the existing energy reserve 10 can maintain the function of the protective device 9 long enough.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power Engineering (AREA)
  • Air Bags (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Stroboscope Apparatuses (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Un dispositif d'alimentation en tension d'appareils électroniques, notamment des dispositifs de sécurité pour les passagers d'un véhicule tels que coussins d'air, tendeurs de ceintures de sécurité et/ou similaires, comprend une alimentation d'appoint qui entre en fonctionnement lors d'une coupure ou d'une chute de la tension de fonctionnement, l'alimentation d'appoint pouvant être connectée au dispositif de sécurité par un commutateur réglable. Afin d'augmenter la sécurité, le commutateur (2) connecte le dispositif de sécurité (9) en état de fonctionnement normal avec l'alimentation d'appoint (10) pendant un test de la capacité de l'énergie disponible dans l'alimentation d'appoint (10), et le prélèvement d'énergie dans l'alimentation d'appoint (10) qui s'ensuit est contrôlé ou évalué.
PCT/DE1990/000363 1989-06-29 1990-05-16 Dispositif d'alimentation en tension d'appareils electroniques WO1991000637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3921305.6 1989-06-29
DE19893921305 DE3921305A1 (de) 1989-06-29 1989-06-29 Spannungsversorgungseinrichtung fuer ein elektronisches geraet

Publications (1)

Publication Number Publication Date
WO1991000637A1 true WO1991000637A1 (fr) 1991-01-10

Family

ID=6383860

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000363 WO1991000637A1 (fr) 1989-06-29 1990-05-16 Dispositif d'alimentation en tension d'appareils electroniques

Country Status (2)

Country Link
DE (2) DE3921305A1 (fr)
WO (1) WO1991000637A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992016992A1 (fr) * 1991-03-23 1992-10-01 Robert Bosch Gmbh Dispositif pour la suppression de chutes de tension
EP0648645A1 (fr) * 1993-10-15 1995-04-19 Fujitsu Ten Limited Dispositif de contrôle électrique pour un système air-bag
WO1996017740A3 (fr) * 1994-12-07 1996-08-22 Rosenau Viktor Systeme de manutention au sol comportant des vehicules a entrainement individuel avec accumulateur a condensateur a electrolyte
WO1997014583A3 (fr) * 1995-10-20 1997-05-15 Bosch Gmbh Robert Dispositif de commande d'un ensemble de declenchement d'un systeme de retenue
WO2007003469A3 (fr) * 2005-07-04 2007-09-07 Bosch Gmbh Robert Appareil de commande pour la protection des personnes
DE102013212149A1 (de) 2013-06-25 2015-01-08 Volkswagen Aktiengesellschaft Vorrichtung und Verfahren zur Diagnose eines Spannungswandlers

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399621B (de) * 1990-10-22 1995-06-26 Vaillant Gmbh Netzausfallschaltung
DE4203829C2 (de) * 1992-02-10 1994-05-05 Siemens Nixdorf Inf Syst Gleichspannungs-Speiseschaltung
JPH0781515A (ja) * 1993-09-14 1995-03-28 Nippondenso Co Ltd 車両用乗員保護装置
DE19508850A1 (de) * 1995-03-11 1996-09-12 Telefunken Microelectron Schaltungsvorrichtung, insbesondere für sicherheitskritische Systeme in Fahrzeugen zur Personenbeförderung
DE19517698C2 (de) * 1995-05-13 1999-04-22 Telefunken Microelectron Verfahren zur Festlegung der Autarkiezeit eines sicherheitskritischen Systems in einem Fahrzeug zur Personenbeförderung nach dem Abschalten einer Versorgungsspannungsquelle
JP3090037B2 (ja) * 1996-04-24 2000-09-18 株式会社デンソー 車両用乗員保護装置
DE102004010135B4 (de) * 2004-02-27 2013-11-07 Robert Bosch Gmbh Vorrichtung zur Bestromung wenigstens einer Zündendstufe mittels eines Zündstroms aus einer Energiereserve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633159A (en) * 1970-11-10 1972-01-04 Gen Motors Corp Vehicle air cushion actuation and monitoring circuit
US3790822A (en) * 1969-12-29 1974-02-05 Siemens Ag Circuit arrangement for the interruption-free switch-over from an operating current supply apparatus to a standby current supply apparatus
EP0183597A1 (fr) * 1984-11-13 1986-06-04 Thomson-Csf Circuit de protection contre les coupures d'alimentation électrique
US4835513A (en) * 1988-04-22 1989-05-30 Trw Inc. Method and apparatus for testing an airbag restraint system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2746869B2 (de) * 1977-10-19 1979-11-29 Praezisa Industrieelektronik Gmbh, 4300 Essen Funktionsprüfeinrichtung für Einzelbatterie-Notleuchten
DE2936675C2 (de) * 1979-09-11 1981-11-19 Wörl-Alarm August Wörl, 8035 Gauting Notstrombatterie-Überwachungsschaltung
JPS6071A (ja) * 1983-06-15 1985-01-05 Matsushita Electric Works Ltd 電池による負荷駆動装置
DE3738862A1 (de) * 1987-11-16 1989-05-24 Bosch Gmbh Robert Verfahren zum betrieb einer sicherheitseinrichtung fuer fahrzeuginsassen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790822A (en) * 1969-12-29 1974-02-05 Siemens Ag Circuit arrangement for the interruption-free switch-over from an operating current supply apparatus to a standby current supply apparatus
US3633159A (en) * 1970-11-10 1972-01-04 Gen Motors Corp Vehicle air cushion actuation and monitoring circuit
EP0183597A1 (fr) * 1984-11-13 1986-06-04 Thomson-Csf Circuit de protection contre les coupures d'alimentation électrique
US4835513A (en) * 1988-04-22 1989-05-30 Trw Inc. Method and apparatus for testing an airbag restraint system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992016992A1 (fr) * 1991-03-23 1992-10-01 Robert Bosch Gmbh Dispositif pour la suppression de chutes de tension
US5414304A (en) * 1991-03-23 1995-05-09 Robert Bosch Gmbh Device for suppressing voltage drops
EP0648645A1 (fr) * 1993-10-15 1995-04-19 Fujitsu Ten Limited Dispositif de contrôle électrique pour un système air-bag
US5638274A (en) * 1993-10-15 1997-06-10 Fujitsu Ten Limited Electronic control apparatus for an air-bag system
WO1996017740A3 (fr) * 1994-12-07 1996-08-22 Rosenau Viktor Systeme de manutention au sol comportant des vehicules a entrainement individuel avec accumulateur a condensateur a electrolyte
WO1997014583A3 (fr) * 1995-10-20 1997-05-15 Bosch Gmbh Robert Dispositif de commande d'un ensemble de declenchement d'un systeme de retenue
WO2007003469A3 (fr) * 2005-07-04 2007-09-07 Bosch Gmbh Robert Appareil de commande pour la protection des personnes
US7831361B2 (en) 2005-07-04 2010-11-09 Robert Bosch Gmbh Control unit for personal protection
DE102013212149A1 (de) 2013-06-25 2015-01-08 Volkswagen Aktiengesellschaft Vorrichtung und Verfahren zur Diagnose eines Spannungswandlers
DE102013212149B4 (de) 2013-06-25 2024-11-21 Volkswagen Aktiengesellschaft Vorrichtung und Verfahren zur Diagnose eines Spannungswandlers

Also Published As

Publication number Publication date
DE8916156U1 (de) 1994-05-05
DE3921305A1 (de) 1991-01-10

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