EP0433281A1 - Transformateur de tension servant a charger un accumulateur d'energie - Google Patents

Transformateur de tension servant a charger un accumulateur d'energie

Info

Publication number
EP0433281A1
EP0433281A1 EP19880907279 EP88907279A EP0433281A1 EP 0433281 A1 EP0433281 A1 EP 0433281A1 EP 19880907279 EP19880907279 EP 19880907279 EP 88907279 A EP88907279 A EP 88907279A EP 0433281 A1 EP0433281 A1 EP 0433281A1
Authority
EP
European Patent Office
Prior art keywords
voltage
energy store
energy
charging
transistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19880907279
Other languages
German (de)
English (en)
Inventor
Rainer Rehage
Wolfgang Drobny
Reinhard Pfeufer
Werner Nitschke
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.)
Robert Bosch GmbH
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 EP0433281A1 publication Critical patent/EP0433281A1/fr
Withdrawn legal-status Critical Current

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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles

Definitions

  • the present invention relates to a voltage transformer of the kind described in the precharacterising part of claim 1.
  • Such a device is already known for use in connection with an air bag protection device in a motor vehicle.
  • the energy store is used for providing energy to detonate one or more air bag gas capsules for inflating the air bag or bags in the event of loss of battery power during a collision condition. It is also necessary to provide energy during such conditions for driving additional electronic circuitry of the motor vehicle and the usual practice has been to provide a separate voltage charging source for this purpose since the energy store for driving the electronics is generally to be charged to a smaller voltage than that for detonating the air bag capsules.
  • i is an object of the present invention to provide a voltage transformer which overcomes this disadvantage of the known arrangement.
  • the voltage transformer shown in the drawing operates on the known conversion principle of the so-called "flyback regulator” wherein energy is stored in a coil coupled to the battery voltage supply and a higher voltage is generated by periodically shorting the coil to earth by means of a controlled power stage.
  • the battery voltage U BA ⁇ protected from interference pulses, is supplied by way of a diode D- ⁇ to one end of a coil L.
  • the diode Di protects the circuit against reverse connection of the battery.
  • the opposite end of the coil L is connected by way of a diode D£ to the one ends of a pair of storage capacitors CT , C2 whose other ends are earthed and which, together, form a first energy store 1 whose purpose is to provide energy for detonating one or more inflation capsules of air bags, used for the protection of the occupants of motor vehicles in a collision condition, in the event of loss of battery power.
  • the diode D ⁇ and coil L, together with a capacitor C ⁇ form an inductive energy-storing device 2.
  • each of the capacitors C ⁇ , C2 has a capacity of 4700 ⁇ F and is rated at 63V.
  • the combined capacity is therefore 9.4 mF.
  • a resistor R ⁇ and further diode D3 lead from the battery input to the capacitors C* ⁇ , C2 and form an auxiliary charging circuit 3 in a conventional manner.
  • a MOSFET transistor Ti Coupled to the point P at the s.econd end of the coil L is a MOSFET transistor Ti forming a power output stage 4. When rendered conductive, the transistor T acts to connect the point P to ground.
  • the controlling terminal of the transistor T* ⁇ is connected in a known manner to the output F of an astable multivibrator device 5 which is of known construction and is therefore not described further herein.
  • the output F of the astable multivibrator 5 is also connected to a regulating device 6 which is described in more detail hereinafter but which acts under certain specified conditions to suppress the controlling action of the astable multivibrator 5 and prevents switching of the MOSFET transistor T ⁇ •
  • a second energy store 7, consisting of a further capacitor C ⁇ , is coupled to the first energy store 1 by way of a charge control circuit 8 which only allows the second energy store 7 to be charged when the charging voltage of the first energy store 1 has reached a predetermined level, in this case 30 volts.
  • the capacitor C forming the second energy store 7 has a capacity of 6.8mF and a rated voltage of 40 volts.
  • the battery voltage (typically 12-16 volts) protected against spikes, is applied to the coil L.
  • the astable multivibrator 5 operates continuously and acts to cause the transistor T j to repeatedly connect and disconnect the point P to earth, thereby causing a high voltage to be induced across the coil L.
  • This high voltage is rectified by the diode D and begins to charge the capacitors C ⁇ , C£- Initially, the charging voltage on the capacitors C ⁇ » c 2 cannot reach the second energy storing capacitor C ⁇ since the transistor T2 is in a non-conductive state.
  • a Zener diode Z breaks down, thereby switching on a transistor T3 and thence switching on the transistor T£. With the transistor T2 conductive, the capacitor C can then charge via a resistor R . Charging of the capacitor C above a further voltage level (in this case 24V) is, however, prevented by the presence of a
  • the regulator 6 includes a comparator 10 which compares a signal developed from the charging signal on the first capacitors C--_, C£.
  • the upstream capacitors C ⁇ , C first charge to 30 volts; then the capacitor C4 begins to charge to 24 volts and only then does the charging of the first capacitor Ci , C2 continue to rise to the maximum permitted level of 38 volts.
  • the overall charging time to reach the specified charging levels can be achieved in a time t ⁇ seven seconds.
  • the first capacitors C*-_, C are charged in a time Ti three seconds. This, after battery failure, is still sufficient to detonate the inflation capsule(s) with a steady discharge of 10mA after t - seven seconds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Air Bags (AREA)

Abstract

Le transformateur de tension décrit sert à charger deux accumulateurs d'énergie séparés (1, 7) avec deux tensions de charge prédéterminées différentes. Un dispositif d'accumulation d'énergie inductif (2) est couplé à la tension de batterie et est conçu pour être périodiquement mis à la terre sous la commande d'un multivibrateur (5), de façon à produire une tension de charge supérieure à la tension de batterie. La tension de charge est appliquée directement à l'un des accumulateurs d'énergie (1) mais n'est appliquée au second accumulateur d'énergie (7), au moyen d'un dispositif de commande (8), que lorsque la tension de charge s'exerçant sur le premier accumulateur d'énergie (1) atteint un niveau prédéterminé.
EP19880907279 1988-08-17 1988-08-17 Transformateur de tension servant a charger un accumulateur d'energie Withdrawn EP0433281A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1988/000728 WO1990002440A1 (fr) 1988-08-17 1988-08-17 Transformateur de tension servant a charger un accumulateur d'energie

Publications (1)

Publication Number Publication Date
EP0433281A1 true EP0433281A1 (fr) 1991-06-26

Family

ID=8165312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880907279 Withdrawn EP0433281A1 (fr) 1988-08-17 1988-08-17 Transformateur de tension servant a charger un accumulateur d'energie

Country Status (3)

Country Link
EP (1) EP0433281A1 (fr)
JP (1) JPH04500147A (fr)
WO (1) WO1990002440A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940929C1 (fr) * 1989-12-12 1991-05-08 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De
IT1251206B (it) * 1991-09-18 1995-05-04 Magneti Marelli Spa Impianto elettrico di un autoveicolo, comprendente almeno un supercondensatore.
SE504452C2 (sv) * 1994-10-04 1997-02-17 Nokia Audio & Electronics Ab System för utlösning av en skyddsanordning
DE19507620A1 (de) * 1995-03-04 1996-09-05 Telefunken Microelectron Anordnung zur Verhinderung von Fehlauslösungen bei Insassen-Schutzsystemen
DE19507619A1 (de) * 1995-03-04 1996-09-05 Telefunken Microelectron Schaltung zur Steuerung und Zündung von Insassen-Schutzvorrichtungen
US5734317A (en) * 1996-07-01 1998-03-31 Motorola, Inc. Current limit controller for an air bag deployment system
DE10106520A1 (de) 2001-02-13 2002-08-22 Conti Temic Microelectronic Eingangsschaltung für die Zuführung einer Versorgungsspannung an eine Elektronikbaugruppe mit einem Autarkiekondensator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3563501D1 (en) * 1984-05-09 1988-07-28 Hasler Ag Dc/dc converter
DE3506487C2 (de) * 1985-02-23 1987-01-29 Daimler-Benz Ag, 7000 Stuttgart Spannungsversorgungseinrichtung für eine Insassenschutzvorrichtung in einem Fahrzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9002440A1 *

Also Published As

Publication number Publication date
JPH04500147A (ja) 1992-01-09
WO1990002440A1 (fr) 1990-03-08

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19901215

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB SE

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROBERT BOSCH GMBH

17Q First examination report despatched

Effective date: 19920828

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19921229