WO1991000637A1 - Voltage supply device for electronic appliances - Google Patents

Voltage supply device for electronic appliances Download PDF

Info

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)
French (fr)
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/en

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)

Abstract

A voltage supply device for electronic appliances, in particular safety devices for vehicle occupants, such as air bags, belt tighteners and/or the like, comprises an energy reserve which functions in the event of a failure or drop in the operating voltage and which can be connected to the safety device by a controllable switch. For greater safety, the switch (2) connects the safety device (9) in normal operation to the energy reserve (10) during a capacity test to determine the energy available in the energy reserve (10), and the energy withdrawn from the energy reserve (10) is then monitored or evaluated.

Description

Spannungsversorgungseinrichtung für ein elektroni- sches GerätPower supply device for an electronic device
Stand der TechnikState of the art
Die Erfindung betrifft eine Spannungsversorgungsein¬ richtung für ein elektronisches Gerät, insbesondere eine Fahrzeuginsassen-Schutzeinrichtung, wie Airbag, Gurtstraffer und/oder dergleichen, mit einer bei einem Ausfall oder einem Absinken einer Betriebsspan¬ nung in Funktion tretenden Energiereserve, die über ein steuerbares Schaltmittel an die Schutzeinrichtung anlegbar ist.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.
Bei der genannten Schutzeinrichtung ist aus Sicher¬ heitsgründen eine Energiereserve erforderlich, uiπ die Funktion des Systems auch dann noch zu gewährleisten, wenn beispielsweise die Verbindung zu der Betriebs- Spannung des Fahrzeugs, also der von der Fahrzeugbat¬ terie zur Verfügung gestellten Bordnetzspannung, unterbrochen ist. Die Energiereserve weist eine Spei¬ chereinrichtung auf, die dann die zur Auslösung der Schutzeinrichtung erforderliche Energie zur Verfügung stellt. Vorzugsweise ist die Energiereserve mittels eines Elektrolytkondensators realisiert.For safety reasons, 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.
Aus der nicht vorveröffentlichten deutschen Patentan¬ meldung P 38 28 990 geht eine Spannungsversorgungs¬ einrichtung hervor, bei der bei einem Abfall der Be¬ triebsspannung eine Energiereserve über ein Schalt¬ mittel an die Schutzeinrichtung angeschlossen wird. Für einen sicheren Betrieb der Schutzeinrichtung muß stets gewährleistet sein, daß die Energie der Ener¬ giereserve ausreicht, die Schutzeinrichtung auszu¬ lösen.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.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Spannungsversorgungseinrichtung mit den im Hauptanspruch genannten Merkmalen hat den Vorteil, daß für einen Kapazitätstest der in der En¬ ergiereserve vorhandenen Energie das Schaltmittel die sich im Normalbetrieb befindliche Schutzeinrichtung mit der Energiereserve verbindet und daß die hier¬ durch erfolgende Energieentnahme aus der Energie¬ reserve überwacht/ausgewertet wird. Dieser Kapazi¬ tätstest stellt sicher, daß nicht nur die Ladespan¬ nung der Energiereserve feststellbar ist, sondern auch eine dynamische Stromentnahme erfolgt, so daß die zur Verfügung stehende, gespeicherte Energie be¬ stimmt werden kann. Bei dem erfindungsgemäßen Kapazi- tätstest werden somit beispielsweise Toleranzen der Bauteile erfaßt, so daß stets eine sichere Vorhersage möglich ist, ob die von der Energiereserve zur Ver¬ fügung gestellte Energie für einen Auslösefall aus¬ reicht. Erfindungsgemäß übernimmt damit das Schalt¬ mittel eine Doppelfunktion, indem es einerseits bei einem Ausfall oder einem Absinken der Betriebsspan¬ nung die Schutzeinrichtung mit der Energiereserve verbindet und andererseits -für den erfindungsgemäßen Testzweck- eine Verbindung zwischen der Energie¬ reserve und der Schutzeinrichtung herstellt, wobei - wie üblich- die Stromaufnahme der Sicherheitseinrich- tung im Normalbetrieb nahezu unabhängig von der Größe der Spannung ist, so daß eine nahezu lineare Stromentnahme aus der Energiereserve erfolgt. Damit läßt sich besonders einfach über die Erfassung der Stromflußdauer bestimmen, welche Energiemenge die En¬ ergiereserve zur Verfügung stellen kann. Überdies läßt sich ermitteln, wie lange die Energiereserve in der Lage ist, nach Ausfall der Betriebsspannung (Fahrzeugbatterie) noch eine Betriebsbereitschaft der Schutzeinrichtung zu gewährleisten.The voltage supply device according to the invention 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. With the capacitance according to the invention 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. According to the invention, 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.
Nach einer Weiterbildung der Erfindung ist vorge¬ sehen, daß das Schaltmittel als elektronischer Schal¬ ter ausgebildet ist. Dieser weist vorzugsweise als Schaltglied einen Transistor auf.According to a development of the invention, it is provided that the switching means is designed as an electronic switch. This preferably has a transistor as a switching element.
Die für den erfindungsgemäßen Testzweck erfolgende Energieentnahme aus der Energiereserve wird vorzugs¬ weise von einer Auswerteschaltung überwacht. Diese kann insbesondere Bestandteil einer Mikroprozessor- Schaltung der Schutzeinrichtung sein.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.
Ersatz Nach einer Weiterbildung der Erfindung ist vorge¬ sehen, daß die Energiereserve über einen Spannungs- wandler an die Betriebsspannung angeschlossen ist. Der Spannungswandler ist vorzugsweise als Aufwärts- Spannungswandler ausgebildet. Der Spannungswandler hat die Aufgabe, das Potential der Energiereserve auf einen Wert anzuheben, der größer als das Potential der Betriebsspannung ist. Dieses stellt einerseits sicher, daß die Auslösespannung für die Schutzein¬ richtung über einem für die Auslösung notwendigen Mindestwert liegt und sorgt andererseits auch bei einem Absinken der Betriebsspannung für eine Versor¬ gung der Schutzeinrichtung mit einer Spannung in hin¬ reichender Größe.replacement According to a development of the invention, it is provided that 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.
Vorteilhaft ist es, wenn der Kapazitätstest nur dann erfolgt, wenn die Spannung der Energiereserve größer als die Betriebsspannung ist. Für den erfindungsge¬ mäßen Kapazitätstest ist es nicht erforderlich, daß die Energiereserve hierzu vollständig entladen wird. Vielmehr reicht es aus, nur einen Teil der ge¬ speicherten Energie zu entnehmen. Hieraus lassen sich dann Rückschlüsse auf den Gesamtenergieinhalt vor¬ nehmen. Wenn die Betriebsspannung und die Spannung der Energiereserve jeweils über eine in Durchlaßrich¬ tung geschaltete Diode an der Schutzeinrichtung liegt, läßt sich der Kapazitätstest ohne Abtrennung der Betriebsspannung vornehmen, sofern die Spannung der Energiereserve größer als die der Betriebsspan¬ nung ist. Die beschriebene Schaltungsanordnung stellt dann sicher, daß eine Energieentnahme nur aus der En¬ ergiereserve, nicht aber aus der die Betriebsspannung zur Verfügung stellenden Fahrzeugbatterie erfolgt, da diese über die zugehörige, aufgrund der Potentialver- hältnisse in Sperrichtung wirkende Diode keinen Bei¬ trag liefern kann.It is advantageous if the capacity test is only carried out when the voltage of the energy reserve is greater than the operating voltage. For 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.
Vorzugsweise ist die Energiereserve über die Emitter- Kollektor-Strecke des Transistors des elektronischen Schalters an die Schutzeinrichtung angeschlossen. Die Basis des Transistors ist vorzugsweise an den Ausgang eines Komparators angeschlossen, an dessen einen, ersten Eingang einer Referenzspannung und an dessen anderen, zweiten Eingang eine Testspannung anlegbar ist. Wird für den Kapazitätstest die Testspannung auf einen Wert abgesenkt, der kleiner als die Referenz¬ spannung ist, so steuert der Komparator den Tran¬ sistor derart an, daß dieser seinen leitenden Zustand einnimmt. Mithin wird die Energiereserve mit der Schutzeinrichtung verbunden, so daß der erfindungsge¬ mäße Belastungstest zur Bestimmung des Energieinhalts der Energiereserve vorgenommen werden kann. Ferner wird bei einem derartigen Test auch stets die Zu- schaltbarkeit des Schaltmittels getestet.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.
Nach einer Weiterbildung der Erfindung ist vorge¬ sehen, daß an den zweiten Eingang des Komparators die Versorgungsspannung angeschlossen ist. Sofern die VersorgungsSpannung unter den Referenzspannungswert sinkt, wird der Komparator durchgeschaltet, so daß wiederum eine Verbindung zwischen der Energiereserve und der Schutzeinrichtung hergestellt wird. Dieser Funktion ist wichtig für den Fall, daß bei einem Un¬ fall oder dergleichen vor einer Auslösung der Fahr¬ zeuginsassen-Schutzeinrichtung eine Abtrennung der Fahrzeugbatterie -z.B. durch Deformationen- erfolgt.According to a development of the invention, it is provided that 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.
Er atz att Besonders vorteilhaft ist es, wenn die Spannung der Energiereserve von einem Spannungsbegrenzungs-Glied vorgegeben wird. Dieses schützt den Energiespeicher der Energiereserve vor Überspannungen. Der Energie¬ speicher ist vorzugsweise als Elektrolytkondensator ausgebildet. Desweiteren ist hierdurch ein zusätz¬ licher Schutz bezüglich eines Ausfalles oder einer Fehlfunktion einer oftmals softwaremäßig realisierten Spannungsregelung der Energiereserve realisiert.He atz att It is particularly advantageous if 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.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous developments of the invention are characterized in the subclaims.
Zeichnungdrawing
Die Erfindung wird im folgenden anhand der Figuren näher erläutert. Es zeigen:The invention is explained in more detail below with reference to the figures. Show it:
Figur 1 ein Blockschaltbild einer SpannungsVersor¬ gungseinrichtung undFIG. 1 shows a block diagram of a voltage supply device and
Figur 2 eine Detaildarstellung der Spannungsver¬ sorgungseinrichtung gemäß Figur 1.FIG. 2 shows a detailed illustration of the voltage supply device according to FIG. 1.
Die Figur 1 zeigt eine Schaltungsanordnung 1, die eine mit Schaltmittel 2 versehene, einen elektroni¬ schen Schalter darstellende Schalteinrichtung 3 und einen Spannungswandler 4 aufweist. Die Schalteinrich¬ tung 3 hat einen Eingang 5, an den über eine Diode D. eine Betriebsspannung U_ angeschlossen ist. Die Be¬ triebsspannung U„ wird von der Batterie eines nicht näher dargestellten Fahrzeugs zur Verfügung gestellt. Der Pluspol der Batterie ist an die Anode der Diode D- gelegt, während die Kathode mit dem Eingang 5 in Verbindung steht. Der Minuspol der Betriebsspannung U_ liegt an Masse 6. An einen Verbindungspunkt 7 ist über eine weitere Diode D2 ein Ausgang 8 der Schalt¬ einrichtung 3 angeschlossen. Die Diode D2 ist derart gepolt, daß ihre Kathode am Verbindungspunkt 7 liegt.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.
Der Verbindungspunkt 7 steht ferner mit einer Schutz¬ einrichtung 9 für die Insassen eines Fahrzeugs in Verbindung. Die Schutzeinrichtung 9 ist insbesondere als Rückhaltesystem wie Airbag, Gurtstraffer und/oder dergleichen ausgebildet.The 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.
Ferner ist eine Energiereserve 10 vorgesehen, die als Kondensator C ausgebildet ist. Der eine Anschluß des Kondensators C steht mit Masse 6 in Verbindung, während der andere Anschluß über einen weiteren Ver¬ bindungspunkt 11 und eine Leitung 12 an einen Eingang 13 der Schalteinrichtung 3 angeschlossen ist.Furthermore, 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.
Die Schalteinrichtung 3 steht über eine Leitung 14 mit dem Spannungswandler 4 in Verbindung, der einen Ausgang 15 aufweist, welcher an den Verbindungspunkt 11 angeschlossen ist.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.
Gemäß Figur 2 ist das Schaltmittel 2 der Schaltein¬ richtung 3 als Transistor T ausgebildet, dessen Kol¬ lektor an die Anode der Diode D2 angeschlossen ist. Der Emitter des Transistors T ist an den Verbindungs¬ punkt 11 angeschlossen, an dem der Kondensator C liegt. Ferner ist ein Widerstand R- vorgesehen, des¬ sen einer Anschluß an dem Verbindungspunkt 11 liegt und dessen anderer Anschluß an die Basis des Tran¬ sistors T führt. Die Basis steht ferner mit einer Zenerdiode Z in Verbindung, deren Anode an Masse 6 liegt. Die Kathode der Zenerdiode Z_ führt zu einem Anschluß eines Widerstandes R-, dessen anderer An¬ schluß an einem Ausgang 16 eines Komparators K liegt. Der Komparator K weist einen ersten Eingang 17 auf, an dem eine Referenzspannung UR - liegt. Ein zweiter Eingang 18 des Komparators K steht über eine Diode D, mit der Betriebsspannung U„ in Verbindung, wobei die Betriebs¬ spannung U_ gleich der Batteriespannung UB .. der Fahrzeugsbatterie ist. Die Polung der Diode ist der¬ art vorgesehen, daß dessen Kathode an dem zweiten Eingang 18 liegt. Der zweite Eingang 18 steht ferner mit der Kathode einer weiteren Diode D . in Verbin¬ dung, an dessen Anode eine Testspannung U_ . ange¬ legt werden kann.According to FIG. 2, 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. Furthermore, 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.
Die erfindungsgemäße Spannungsversorgungseinrichtung hat folgende Funktion:The voltage supply device according to the invention has the following function:
Die Beispielsweise als Airbag ausgebildete Schutzein¬ richtung 9 wird über die zwischen dem Verbindungs- punkt 7 und Masse 6 liegende Spannung mit elektri¬ scher Energie versorgt. Im Normalbetrieb wird die En¬ ergiereserve 10 nicht benötigt, da die Versorgung durch die Betriebsspannung U_ erfolgt (Fahrzeugbat¬ terie). Die Energiereserve ist über die als elektro¬ nischer Schalter ausgebildtete Schalteinrichtung von der Schutzeinrichtung 9 abgetrennt. Der Kondensator C der Energiereserve 10 wird über den Spannungswandler 4 auf ein bestimmtes Energieniveau aufgeladen bzw. nachgeladen. Sein Energieinhalt bestimmt sich aus der anliegenden Spannung und der Kapazität. Die Ladespan¬ nung des Kondensators C wird über die Basis-Emitter- Spannung des Transistors T und die Zenerdiode Z_ be¬ grenzt.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. In normal operation, 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.
Sinkt die Betriebsspannung U_ unter die Referenzspan¬ nung UR -, so schaltet der Komparator K auf Masse 6, wodurch der Transistor T in seinen leitenden Zustand versetzt wird. Damit wird der Kondensator C der Ener¬ giereserve 10 über den leitenden Transistor T und die Diode D2 mit der Schutzeinrichtung 9 verbunden. Mithin erfolgt die Versorgung der Schutzeinrichtung 9 über die im Kondensator C gespeicherte Energie.If the operating voltage U_ falls below the reference voltage U R -, 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.
Erfindungsgemäß ist es möglich, den Energieinhalt der Speichereinrichtung 10 sowie die Zuschaltbarkeit (Funktion des Transistors T) zu testen. Dieser Test sollte aus Sicherheitsgründen in regelmäßigen Abstän¬ den erfolgen. Hierzu wird an die Diode D. eine Test¬ spannung U„ t gelegt, die kleiner als die Referenz¬ spannung U„ - ist. Hierdurch wiederholt sich der be¬ reits oben beschriebene Vorgang, das heißt, der Tran¬ sistor T nimmt seinen leitenden Zustand an, so daß die Schutzeinrichtung 9 über den Kondensator C ver¬ sorgt wird. Die Stromaufnahme der Schutzeinrichtung 10 ist im Normalbetrieb nahezu unabhängig von der Höhe ihrer Versorgungsspannung, so daß durch das Ein¬ schalten des elektronischen Schalters (Transistor T) eine nahezu lineare Stromentnahme aus der Energie¬ reserve 10 erfolgt. Diese Energieentnahme wird in einem Zustand vorgenommen, bei dem die Spannung des Kondensators C größer als die Betriebsspannung U_ ist. In diesem Falle sperrt die Diode D-, so daß die Schutzeinrichtung 9 ausschließlich von der in dem Kondensator C gespeicherten Energie versorgt wird.According to 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.
ERSÄΪZBLATT Durch die lineare Stromentnahme aus dem Kondensator C der Energiereserve 10 sinkt im Testbetrieb die Kon¬ densatorspannung ab. Aus der Größe des entnommenen Stromes und die zeitliche Änderung der Kondensator¬ spannung kann auf einfache Weise der Energieinhalt der Energiereserve 10 ermittelt werden. Insbesondere läßt sich sehr einfach bestimmen, wie lange die Ener¬ giereserve 10 nach Ausfall der Betriebsspannung U_ in der Lage ist, die Schutzeinrichtung 9 betriebsbereit zu halten. Die Auswertung der Testergebnisse wird vorzugswed.se durch einen in der Schutzeinrichtung 9 vorhandenen Mikrocomputer durchgeführt und interpre¬ tiert.REPLACEMENT LEAF Due to the linear current draw from the capacitor C of the energy reserve 10, 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.
Durch die Verwendung des elektronischen Schalters (Schalteinrichtung 3) sowohl für das Zuschalten der Energiereserve 10 nach Ausfall der Betriebsspannung U_ und auch zur Durchführung des vorstehend beschrie¬ benen Tests kann ein spezieller Testschalter, wie er in bekannten Einrichtungen zur statischen Messung der Spannung der Energiereserve benutzt wird, entfallen. Dieses führt einerseits zu Kostenersparnissen und er¬ höht andererseits auch die Zuverlässigkeit, da bei einem Test stets auch die Funktion des Schaltmittels 2 überwacht wird.Through the use of the electronic switch (switching device 3) both for switching on the energy reserve 10 after a failure of the operating voltage U_ and also for carrying out the test described above, a special test switch, as used in known devices for static measurement of the voltage of the energy reserve will be eliminated. On the one hand, this leads to cost savings and, on the other hand, also increases the reliability, since the function of the switching means 2 is always monitored during a test.
Ein weiterer Vorteil besteht darin, daß der Ener¬ giereserve 10 zu Testzwecken genau derjenige Strom entnommen wird, der auch bei einem Ausfall der Be¬ triebsspannung benötigt wird, um die Schutzeinrich¬ tung 9 weiter zu versorgen. Damit kann individuell bei jeder Einheit geprüft werden, ob die vorhandene Energiereserve 10 die Funktion der Schutzeinrichtung 9 lange genug aufrechterhalten kann. 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.

Claims

Ansprüche Expectations
1. Spannungsversorgungseinrichtung für ein elektroni¬ sches Gerät, insbesondere für eine Fahrzeuginsassen- Schutzeinrichtung wie Airbag, Gurtstraffer und/oder dergleichen, mit einer bei einem Ausfall oder einem Absinken einer Betriebsspannung in Funktion tretenden Energiereserve, die über ein steuerbares Schaltmittel an die Schutzeinrichtung anlegbar ist, d a d u r c h g e k e n n z e i c h n e t, daß für einen Kapazi¬ tätstest der in der Energiereserve (10) vorhandenen Energie das Schaltmittel (2) die sich im Normalbe¬ trieb befindliche Schutzeinrichtung (9) mit der Ener¬ giereserve (10) verbindet und daß die hierdurch er¬ folgende Energieentnahme aus der Energiereserve (10) überwacht/ausgewertet wird.1. Power supply device for an electronic device, in particular for a vehicle occupant protection device such as an airbag, belt tensioner and / or the like, with an energy reserve that comes into operation in the event of a failure or a drop in the operating voltage, which can be applied to the protection device via a controllable switching means , characterized in that for a capacity test of the energy present in the energy reserve (10) the switching means (2) connects the protective device (9) which is in normal operation to the energy reserve (10) and that the resultant result Energy withdrawal from the energy reserve (10) is monitored / evaluated.
2. Spannungsversorgungseinrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß das Schaltmittel (2) als elektronischer Schalter ausge¬ bildet ist.2. Power supply device according to claim 1, characterized in that the Switching means (2) is designed as an electronic switch.
3. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n ¬ z e i c h n e t, daß der elektronische Schalter als Schaltglied einen Transistor (T) aufweist.3. Power supply device according to one of the preceding claims, d a d u r c h g e k e n ¬ z e i c h n e t that the electronic switch has a transistor (T) as a switching element.
4. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, g e k e n n z e i c h n e t d u r c h eine die Energieentnahme überwachende Aus- werteschaltung.4. Power supply device according to one of the preceding claims, an evaluation circuit monitoring the energy consumption is provided.
5. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß die Auswerteschaltung Bestand¬ teil einer Mikrocomputer-Schaltung der Schutzeinrich¬ tung (9) ist.5. Power supply device according to one of the preceding claims, that the evaluation circuit is part of a microcomputer circuit of the protective device (9).
6. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß die Energiereserve (10) über einen Spannungswandler (4) an die Betriebsspannung (U_ bzw. U_ . ) angeschlossen ist.6. Power supply device according to one of the preceding claims, that the energy reserve (10) is connected via a voltage converter (4) to the operating voltage (U_ or U_.).
7. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß der Spannungswandler (4) ein Aufwärts-Spannungswandler ist.7. Power supply device according to one of the preceding claims, that the voltage converter (4) is an step-up voltage converter.
8. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß der Kapazitätstest nur dann er¬ folgt, wenn die Spannung der Energiereserve (10) größer als die Betriebsspannung (U„ bzw. Uß .. ) ist. 8. Power supply device according to one of the preceding claims, characterized in that the capacitance test only takes place when the voltage of the energy reserve (10) is greater than the operating voltage (U “or U ß ..).
9. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß die Betriebsspannung (Uß bzw. U_ . ) und die Spannung der Energiereserve (10) je¬ weils über eine in Durchlaßrichtung geschaltete Diode (D1,D2) an der Schutzeinrichtung (9) liegt.9. Power supply device according to one of the preceding claims, characterized in that the operating voltage (U ß or U_.) And the voltage of the energy reserve (10) each via a forward-connected diode (D 1 , D 2 ) on the Protective device (9).
10. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n ¬ z e i c h n e t, daß die Energiereserve (10) über die Emitter-Kollektor-Strecke des Transistors (T) des elektronischen Schalters an die Schutzeinrichtung (9) angeschlossen ist.10. Power supply device according to one of the preceding claims, that the energy reserve (10) is connected to the protective device (9) via the emitter-collector path of the transistor (T) of the electronic switch.
11. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß die Basis des Transistors (T) an den Ausgang (16) eines Komparators (K) angeschlossen ist, an dessen einen, ersten Eingang (17) eine Re¬ ferenzspannung (UR f) und an dessen anderen, zweiten Eingang (18) eine Testspannung (U_ . ) anlegbar ist.11. Voltage supply device according to one of the preceding claims, characterized in that the base of the transistor (T) is connected to the output (16) of a comparator (K), at the one, first input (17) of which a reference voltage (U R f ) and a test voltage (U_.) Can be applied to its other, second input (18).
12. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß an den zweiten Eingang (18) die VersorgungsSpannung (U_ bzw. U_ ..) angeschlossen ist.12. Power supply device according to one of the preceding claims, d a d u r c h g e k e n n¬ z e i c h n e t that the supply voltage (U_ or U_ ..) is connected to the second input (18).
13. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß die Versorgungsspannung (U_ bzw. U-3 .. ) über eine in Durchlaßrichtung geschaltete Diode (D3) an den zweiten Eingang (18) angeschlossen ist. 13. Power supply device according to one of the preceding claims, characterized in that the supply voltage (U_ or U- 3 ..) is connected to the second input (18) via a diode (D 3 ) switched in the forward direction.
14. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß die Spannung der Energiereserve (10) von einem Spannungsbegrenzungs-Glied begrenzt wird.14. Voltage supply device according to one of the preceding claims, that the voltage of the energy reserve (10) is limited by a voltage limiting element.
15. Spannungsversorgungseinrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n¬ z e i c h n e t, daß das Spannungsbegrenzungs-Glxed einer Zenerdiode (Z_) ist. 15. Power supply device according to one of the preceding claims, d a d u r c h g e k e n n¬ z e i c h n e t that the voltage limiting Glxed is a Zener diode (Z_).
PCT/DE1990/000363 1989-06-29 1990-05-16 Voltage supply device for electronic appliances WO1991000637A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3921305.6 1989-06-29
DE19893921305 DE3921305A1 (en) 1989-06-29 1989-06-29 VOLTAGE SUPPLY DEVICE FOR AN ELECTRONIC DEVICE

Publications (1)

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

Family

ID=6383860

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000363 WO1991000637A1 (en) 1989-06-29 1990-05-16 Voltage supply device for electronic appliances

Country Status (2)

Country Link
DE (2) DE8916156U1 (en)
WO (1) WO1991000637A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992016992A1 (en) * 1991-03-23 1992-10-01 Robert Bosch Gmbh Device for suppressing voltage drops
EP0648645A1 (en) * 1993-10-15 1995-04-19 Fujitsu Ten Limited An electric control apparatus for an air-bag system
WO1996017740A2 (en) * 1994-12-07 1996-06-13 Rosenau, Viktor Floor conveying system with individual drive vehicles and electrolyte capacitor-type storage battery
WO1997014583A2 (en) * 1995-10-20 1997-04-24 Robert Bosch Gmbh Device for driving the triggering device of a restraining system
WO2007003469A3 (en) * 2005-07-04 2007-09-07 Bosch Gmbh Robert Control unit for personal protection
DE102013212149A1 (en) 2013-06-25 2015-01-08 Volkswagen Aktiengesellschaft Device and method for diagnosing a voltage converter

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399621B (en) * 1990-10-22 1995-06-26 Vaillant Gmbh MAINS FAILURE
DE4203829C2 (en) * 1992-02-10 1994-05-05 Siemens Nixdorf Inf Syst DC supply circuit
JPH0781515A (en) * 1993-09-14 1995-03-28 Nippondenso Co Ltd Vehicular occupant protecting device
DE19508850A1 (en) * 1995-03-11 1996-09-12 Telefunken Microelectron Circuit device, in particular for safety-critical systems in vehicles for the transportation of people
DE19517698C2 (en) * 1995-05-13 1999-04-22 Telefunken Microelectron Method for determining the self-sufficiency time of a safety-critical system in a vehicle for the transportation of people after switching off a supply voltage source
JP3090037B2 (en) * 1996-04-24 2000-09-18 株式会社デンソー Vehicle occupant protection system
DE102004010135B4 (en) * 2004-02-27 2013-11-07 Robert Bosch Gmbh Device for energizing at least one ignition output by means of an ignition current from an energy reserve

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 (en) * 1984-11-13 1986-06-04 Thomson-Csf Protection circuit against electric power supply cut-off
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 (en) * 1977-10-19 1979-11-29 Praezisa Industrieelektronik Gmbh, 4300 Essen Function test device for single-battery emergency lights
DE2936675C2 (en) * 1979-09-11 1981-11-19 Wörl-Alarm August Wörl, 8035 Gauting Emergency battery monitoring circuit
JPS6071A (en) * 1983-06-15 1985-01-05 Matsushita Electric Works Ltd Load drive apparatus by battery
DE3738862A1 (en) * 1987-11-16 1989-05-24 Bosch Gmbh Robert METHOD FOR OPERATING A SAFETY DEVICE FOR VEHICLE PASSENGERS

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 (en) * 1984-11-13 1986-06-04 Thomson-Csf Protection circuit against electric power supply cut-off
US4835513A (en) * 1988-04-22 1989-05-30 Trw Inc. Method and apparatus for testing an airbag restraint system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992016992A1 (en) * 1991-03-23 1992-10-01 Robert Bosch Gmbh Device for suppressing voltage drops
US5414304A (en) * 1991-03-23 1995-05-09 Robert Bosch Gmbh Device for suppressing voltage drops
EP0648645A1 (en) * 1993-10-15 1995-04-19 Fujitsu Ten Limited An electric control apparatus for an air-bag system
US5638274A (en) * 1993-10-15 1997-06-10 Fujitsu Ten Limited Electronic control apparatus for an air-bag system
WO1996017740A2 (en) * 1994-12-07 1996-06-13 Rosenau, Viktor Floor conveying system with individual drive vehicles and electrolyte capacitor-type storage battery
WO1996017740A3 (en) * 1994-12-07 1996-08-22 Rosenau Viktor Floor conveying system with individual drive vehicles and electrolyte capacitor-type storage battery
WO1997014583A2 (en) * 1995-10-20 1997-04-24 Robert Bosch Gmbh Device for driving the triggering device of a restraining system
WO1997014583A3 (en) * 1995-10-20 1997-05-15 Bosch Gmbh Robert Device for driving the triggering device of a restraining system
WO2007003469A3 (en) * 2005-07-04 2007-09-07 Bosch Gmbh Robert Control unit for personal protection
US7831361B2 (en) 2005-07-04 2010-11-09 Robert Bosch Gmbh Control unit for personal protection
DE102013212149A1 (en) 2013-06-25 2015-01-08 Volkswagen Aktiengesellschaft Device and method for diagnosing a voltage converter

Also Published As

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

Similar Documents

Publication Publication Date Title
DE4432444C2 (en) The vehicle occupant protection system
WO1993011003A1 (en) Device for supplying electric power in a motor vehicle
WO1991000637A1 (en) Voltage supply device for electronic appliances
DE102009002466A1 (en) Extended battery diagnosis for traction batteries
DE102006005334A1 (en) Method for monitoring and / or controlling or regulating the voltage of at least one cell group in a cell network of an energy store
EP1997205B1 (en) Diagnostic circuit for an energy storage element
WO1991000636A1 (en) Safety device for vehicle passengers
DE102017214302A1 (en) Switch-off device for an electrical supply network
DE102020208401A1 (en) Method for safeguarding, in particular, safety-relevant consumers in a motor vehicle
EP3132271B1 (en) Method and device for ascertaining an inner resistance of a supply network for supplying energy to a personal protection device of a vehicle
DE102020208399A1 (en) Device for securing, in particular, safety-relevant consumers in a motor vehicle
DE102018212351A1 (en) Method for diagnosing a switching device in a motor vehicle
EP2766595A1 (en) Method for checking a supply circuit and associated supply circuit for at least one ignition circuit
DE102018105826B4 (en) ELECTRICAL SUPPLY SYSTEM AND PROCEDURE
DE102009049321A1 (en) Energy storage system for supplying electrical energy to consumers in a vehicle
WO1990007815A1 (en) Battery-charging system with fault indicator
EP0732793B1 (en) Circuit device, particularly for safety critical systems in vehicles used for transporting people
DE102019214168A1 (en) Method for operating a battery module and battery module
DE10324250B4 (en) Power supply system for safety-relevant electrical consumers
DE2609428C2 (en) Method for preventing the processing of the malfunctions caused by insufficient supply voltage during the operating voltage failure in a battery-backed semiconductor memory and arrangement for carrying out the method
DE112022001803T5 (en) Auxiliary power supply device and method for controlling an auxiliary power supply device
DE3805256A1 (en) Reserve circuit for supplying emergency power to a load in a vehicle
WO2002047234A1 (en) Error recognition device for a multi-voltage vehicle electrical system
DE10231089A1 (en) Device for selecting power supply in on-board electrical system has first, second energy sources connected to load via diode arrangements configured with greater voltage drop across second than first
WO2004051823A1 (en) Mobile electric supply unit comprising an autonomous capacitor

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LU NL SE