EP0645945A1 - Dispositif avertisseur à éclairs utilisé sur des véhicules - Google Patents

Dispositif avertisseur à éclairs utilisé sur des véhicules Download PDF

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Publication number
EP0645945A1
EP0645945A1 EP94114494A EP94114494A EP0645945A1 EP 0645945 A1 EP0645945 A1 EP 0645945A1 EP 94114494 A EP94114494 A EP 94114494A EP 94114494 A EP94114494 A EP 94114494A EP 0645945 A1 EP0645945 A1 EP 0645945A1
Authority
EP
European Patent Office
Prior art keywords
fault
warning system
flashing light
light warning
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94114494A
Other languages
German (de)
English (en)
Other versions
EP0645945B1 (fr
Inventor
Frank Klein
Gerhard Hinze
Werner Lepper
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP0645945A1 publication Critical patent/EP0645945A1/fr
Application granted granted Critical
Publication of EP0645945B1 publication Critical patent/EP0645945B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
    • H05B41/34—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp to provide a sequence of flashes

Definitions

  • the invention relates to a flashing light system for operation in vehicles, with a voltage converter which is fed from the vehicle electrical system by means of a converter control, with an energy store which is charged from the voltage generated by the voltage converter and which forms a lamp circuit with a flash tube and with an ignition stage , which is connected to the flash tube and to a clock generator, the ignition stage generating ignition pulses for the ignition of the flash tube in dependence on the clock signals of the clock generator.
  • a flashing light warning system is known from German patent DE 39 17 062 C2, which is suitable for operation in vehicles.
  • This flashing light warning system has a voltage converter which is designed as a flyback converter and which is supplied from the vehicle electrical system via a converter control. From the voltage generated by the voltage converter, an energy store, which is designed as a capacitor having a high capacitance, is charged. This forms a lamp circle with at least one flash tube.
  • the light flash warning system also has an ignition stage which is coupled to the flash tube via an ignition electrode and is connected to a clock generator, the ignition stage generating ignition pulses for the ignition of the flash tube depending on the clock signals of the clock generator and the energy store being discharged.
  • the known light flash warning system also has a lightning voltage monitor that controls the state of charge of the energy store and controls the converter control as a function of the state of charge of the energy store.
  • This known safety shutdown proves to be disadvantageous in that the converter is only shut down due to an error in which the generation of voltage pulses in the lamp circuit is no longer possible. It proves to be particularly disadvantageous that when the high voltage is grounded to ground, for example when a person comes into contact with the leads to the flash tube, the voltage converter is not switched off, since voltage pulses can continue to be generated in the lamp circuit.
  • the invention has for its object to provide a flashing light system which has a high level of security against destruction of components of the system in the event of malfunctions and damage and protects people who come into contact with high-voltage parts of the system as well as possible from damage.
  • a current sensor is arranged in the lamp circuit, that the current sensor is connected to a fault current detection, that the fault current detection is connected to the clock generator is that the fault current detection links the clock signal from the clock generator with the signal from the current sensor, that an error signal is generated only outside the pulse duration of the light flashes, and that the fault current detection is connected to the converter control for switching off the voltage converter in the event of an error signal.
  • a current sensor is arranged in the lamp circuit, because the current flowing in the lamp circuit can thus be determined in a simple manner.
  • the current sensor is connected to a fault current detection, the possibility of monitoring the current flowing in the lamp circuit arises in a simple and inexpensive manner.
  • the fault current detection is connected to the clock generator, that the fault current detection combines the clock signal from the clock generator with the signal from the current sensor, and that an error signal is only generated outside the pulse duration of the light flashes, because thus a current flowing in the lamp circuit can be recognized in a simple and cost-effective manner by the fault current detection, which current is not caused by the ignition of the flash tube and the discharge of the energy store, but outside the pulse duration of the light flashes, which as current pulses in the lamp circuit by the Current sensor are measured.
  • Such a fault current to be detected in the lamp circuit can occur, for example, through a glass break on the flash tube or through destruction of the line insulation in the lamp circuit if a body connection of the high voltage to ground occurs.
  • the energy store is discharged to ground. If the body closure is created by a person, this can be damaged.
  • the fault current detection is connected to the converter control for switching off the voltage converter when a fault signal is present, thereby avoiding recharging of the energy store and avoiding damage to components of the flashing light warning system or to people.
  • the fault current detection is connected to a quick discharge circuit which is connected to the energy store and discharges it when the fault signal is present, as a result of which the residual charge of the energy store is rapidly and easily reduced in the high voltage circuit of the lamp when a fault current occurs, which prevents damage to components of the flashing light warning system and to people who come into contact with the lamp circuit.
  • a fault memory is arranged in the connection between the fault current detection with the converter control and the fast discharge circuit prevents the light flash warning system from switching on again automatically when a fault current is detected.
  • the fault memory can be reset by disconnecting the flashing light system from the on-board voltage, thereby ensuring that the presence of a fault is consciously perceived, self-activation of the flashing light warning system is avoided and a fault check is carried out by a specialist.
  • a flash misfire detection is arranged in parallel with the fault current detection in the connection between the current sensor and the fault memory, so that there is additional security if the Functionality of the flashing light warning system, for example due to a break in the supply line of the flash tube or a lack of age-related ignitability of the flash tube no longer exists.
  • the voltage converter is switched off via the converter control and the energy store is rapidly discharged via the rapid discharge circuit.
  • the fault current detection has a timing element, the time constant of which is greater than the duration of the flash pulse, which in a particularly simple and cost-effective manner avoids that the periodic current pulses introduced by the clock signal in the lamp circuit due to the discharge of the energy store cause the flash tube to switch off the voltage converter, since the generation of an error signal is blocked for the duration of the flash pulse.
  • the current sensor has a diode arrangement in the lamp circuit, as a result of which the current measurement is carried out with a high degree of safety and high accuracy.
  • the quick discharge circuit has an electronic switch and a low-resistance discharge resistor results in a simple and inexpensive construction of the quick discharge circuit.
  • the flashing light warning system with the protective devices mentioned in an emergency light for criminal vehicles with an automatically acting holder for optional attachment to the vehicle roof, since such use can easily damage the flashing light warning system, for example in the event of an accident, in which the emergency light detaches from the vehicle due to its attachment, is damaged and the flash tube or high-voltage circuit parts are exposed and can come into contact with people, for example.
  • the single figure shows a block diagram of a flashing light warning system according to the invention for operation in vehicles.
  • An EMC filter (F) connected to ground is connected to the on-board voltage, not shown here, which consists, for example, of the motor vehicle battery.
  • the voltage converter (S) which can be constructed as a flyback converter, for example, is fed on the primary side from the filtered on-board voltage via a converter control (W).
  • the voltage converter (S) is connected on the secondary side to an energy store (E), which can be designed as an electrolytic capacitor with high capacitance.
  • the energy store (E) is charged by the voltage generated by the voltage converter (S).
  • the energy store (E) is connected to at least one flash tube (BR) and can be discharged via this.
  • the energy store (E) forms a lamp circuit with the at least one flash tube (BR).
  • the flash tube (BR) is connected to an ignition stage (Z), which is fed by the voltage from the voltage converter (S) becomes.
  • the ignition stage (Z) is also connected to a clock generator (T) which generates pulse-shaped clock signals and feeds the ignition stage (Z).
  • T clock generator
  • the ignition stage (Z) generates ignition pulses which are fed to the at least one flash tube (BR) via an ignition electrode. Due to the ignition pulses from the ignition stage (Z), the gas mixture ignites in the flash tube (BR) and a flash of light is generated when the energy store (E) is discharged. A current flows into the lamp circuit. As can be seen from the block diagram, the lamp circuit is connected to ground.
  • a lightning voltage monitor (BW) is assigned to the energy store, which controls the state of charge of the energy store (E) and generates a signal as a function of a predetermined voltage value that controls the converter control (W) and thereby switches off the voltage converter (S) becomes.
  • the energy store (E) is electrically conductively connected to the lightning voltage monitor (BW) and this to the converter control (W).
  • a booster voltage generator (B) is arranged in parallel with the energy store (E), which is generated from the voltage from the voltage converter (S ) is supplied.
  • This booster voltage generation (B) has a high-voltage-resistant capacitor with a small charging time constant to initiate the lightning discharge.
  • a current sensor is arranged between the cathode of the flash tube (BR) and the energy store (E). This has, for example, a diode arrangement for measuring the voltage drop corresponding to a current in the lamp circuit.
  • the current sensor (SS) is connected on the one hand to a lightning interruption detection (BA) and on the other hand to a residual current detection (FE).
  • the flash failure detection (BA) has, for example, a triggerable flip-flop, the triggering being effected by the current pulses generated in the lamp circuit by the ignition of the flash tube (BR). If the current pulses in the lamp circuit are interrupted in a timed manner, the flash interruption detection (BA) generates an error signal.
  • the fault current detection (FE) is also connected to the clock generator (T) and also has, for example, a triggerable multivibrator.
  • the fault current detection (FE) links the current signal measured by the current sensor (SS) in the lamp circuit with the clock signal generated by the clock generator (T), which is the same signal that also controls the ignition stage (Z) to generate ignition pulses, such that that an error signal is generated only outside the pulse duration of the light flashes and the current pulses occurring in the lamp circuit.
  • the fault current detection (FE) for linking the signals from the current sensor (SS) and the clock generator (T) can have an adder.
  • the residual current detection (FE) has a timer with a time constant that is greater than the duration of the lightning pulse.
  • Both the fault current detection (FE) and the flash misfire detection (BA) are each connected to a fault memory (FS).
  • the error memory (FS) In the event of an error signal from the flash failure detection (BA) or the residual current detection (FE), the error memory (FS) generates a signal for switching off the voltage converter (S).
  • the fault memory (FS) is electrically conductively connected to the converter control (W).
  • the fault memory (FS) is connected in an electrically conductive manner to a quick discharge circuit (SE) which is activated by the fault memory detection (FS) in the event of an existing fault signal by the flash misfire detection (BA) or the fault current detection (FE).
  • SE quick discharge circuit
  • the Fast discharge circuit (SE) is electrically conductively connected to both the energy store (E) and the booster voltage generation (B) and discharges the energy store (E) and the capacitor of the booster voltage generation (B) as quickly as possible when activated by the fault memory (FS).
  • the rapid discharge circuit (SE) has an electronic switch and a low-resistance discharge resistor.
  • the clock generator (T) is electrically conductively connected to the converter control (W) for triggering.
  • the generation of an error signal by the fault current detection (FE) takes place here, for example, in a time less than or equal to 100 milliseconds and in particular approximately 30 milliseconds after the occurrence of a fault current.

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Traffic Control Systems (AREA)
  • Audible And Visible Signals (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP94114494A 1993-09-29 1994-09-15 Dispositif avertisseur à éclairs utilisé sur des véhicules Expired - Lifetime EP0645945B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4333045A DE4333045A1 (de) 1993-09-29 1993-09-29 Lichtblitzwarnanlage zum Betrieb in Fahrzeugen
DE4333045 1993-09-29

Publications (2)

Publication Number Publication Date
EP0645945A1 true EP0645945A1 (fr) 1995-03-29
EP0645945B1 EP0645945B1 (fr) 1998-12-16

Family

ID=6498875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94114494A Expired - Lifetime EP0645945B1 (fr) 1993-09-29 1994-09-15 Dispositif avertisseur à éclairs utilisé sur des véhicules

Country Status (5)

Country Link
EP (1) EP0645945B1 (fr)
AT (1) ATE174749T1 (fr)
DE (2) DE4333045A1 (fr)
DK (1) DK0645945T3 (fr)
ES (1) ES2124826T3 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399201A1 (fr) * 1989-05-26 1990-11-28 Hella KG Hueck & Co. Système d'alarme pour lumière de flash
DE9102562U1 (fr) * 1990-10-26 1991-06-13 Uke Kranefeld Elektronik Gmbh, 4479 Herzlake, De

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU385303A1 (ru) * 1971-02-01 1973-05-29 4»СЕСОЮЗНАЯ ПАТЬНТНи-ТСХКйНЕПНА?
DE2703387B2 (de) * 1977-01-27 1979-07-12 Heimann Gmbh, 6200 Wiesbaden Kennleuchtenanlage für Krafträder
IT1155172B (it) * 1982-04-30 1987-01-21 Wepoo Spa Circuito di protezione di un dispositivo di segnalazione a lampeggioamento
US4701672A (en) * 1985-05-28 1987-10-20 Tomar Electronics, Inc. Strobe flash monitor
US4870543A (en) * 1988-10-24 1989-09-26 Robert L. Horton Extensible safety light

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399201A1 (fr) * 1989-05-26 1990-11-28 Hella KG Hueck & Co. Système d'alarme pour lumière de flash
DE3917062A1 (de) * 1989-05-26 1990-11-29 Hella Kg Hueck & Co Lichtblitzwarnanlage
DE9102562U1 (fr) * 1990-10-26 1991-06-13 Uke Kranefeld Elektronik Gmbh, 4479 Herzlake, De

Also Published As

Publication number Publication date
DE4333045A1 (de) 1995-03-30
DK0645945T3 (da) 1999-08-23
EP0645945B1 (fr) 1998-12-16
DE59407487D1 (de) 1999-01-28
ES2124826T3 (es) 1999-02-16
ATE174749T1 (de) 1999-01-15

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