EP0399201B1 - Système d'alarme pour lumière de flash - Google Patents

Système d'alarme pour lumière de flash Download PDF

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Publication number
EP0399201B1
EP0399201B1 EP90107160A EP90107160A EP0399201B1 EP 0399201 B1 EP0399201 B1 EP 0399201B1 EP 90107160 A EP90107160 A EP 90107160A EP 90107160 A EP90107160 A EP 90107160A EP 0399201 B1 EP0399201 B1 EP 0399201B1
Authority
EP
European Patent Office
Prior art keywords
voltage
photoflash
sensing device
installation according
storage capacitor
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.)
Expired - Lifetime
Application number
EP90107160A
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German (de)
English (en)
Other versions
EP0399201A1 (fr
Inventor
Werner Lepper
Dieter Nolte
Peter Schulte
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.)
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Publication date
Application filed by Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP0399201A1 publication Critical patent/EP0399201A1/fr
Application granted granted Critical
Publication of EP0399201B1 publication Critical patent/EP0399201B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • This previously known flashing light warning system also has an electrical voltage sensing device which determines the charging voltage of the first storage capacitor and compares it with a predetermined reference voltage. However, this voltage sensing device does not control the electrical switch.
  • the known flashing light warning system has disadvantages.
  • the electrical switch there is designed as a manually operated switch and enables, depending on his Switching state, only two possible energy levels that can be stored in the storage capacitors.
  • the resistance that causes the slower charging of the second capacitor only leads to a substantially reduced charging of the first storage capacitor if the flyback converter is switched off after a predetermined period of time, if, for. B. the second storage capacitor is charged, that is, a complex control of the flyback converter is required.
  • both capacitors must have the same dielectric strength, even if the first storage capacitor is charged to a lower voltage than the second storage capacitor. This means that the first storage capacitor must be selected accordingly in a costly manner and with a large space requirement.
  • This known light flash warning system has the disadvantage that it is only suitable for generating double light flashes. However, it is not possible to generate a flash of light with variable energy or flash light intensity.
  • This object is achieved in that the switch is electrically controllable and that the first voltage sensing device opens the switch when the charging voltage of the first storage capacitor exceeds the first reference voltage.
  • the flashing light warning system according to the invention has the advantage over the prior art in particular that the safe ignition of the flash tube is effected by the second storage capacitor having a comparatively small capacity and charged to full charging voltage.
  • the electrical energy for the continued operation of the flash tube is then supplied by the first capacitor, possibly with a low charging voltage, but with a significantly higher capacitance than that of the second storage capacitor.
  • the charging voltage of the first storage capacitor and thus the light energy or light intensity of the light flash of the light flash warning system according to the invention can now be influenced within wide limits.
  • the flashing light warning system according to the invention has the further advantage that the maximum charging voltage or the dielectric strength of the first storage capacitor can be chosen to be smaller than that known before, because after the flash tube is ignited, the flashing light warning system continues to operate in order to maintain the arc of the light tube, compared to the ignition voltage, low voltages are sufficient. Frequently, the required ignition voltage of flash tubes is around 500 volts, whereas the voltage for maintaining the gas discharge of the flash tube is around 150 volts.
  • the first storage capacitor can be chosen to be smaller compared to the prior art, and the construction of the flashing light warning system according to the invention is more economical than the prior art.
  • the first storage capacitor of the flashing light warning system according to the invention takes up less space than the previously known.
  • the first voltage sensing device can advantageously have a voltage divider, consisting of two resistors, parallel to the first storage capacitor.
  • the voltage drop at the center tap of the voltage divider is then proportional to the charging voltage of the first storage capacitor, but has a comparatively low absolute value compared to this charging voltage. This simplifies the further processing of the charging voltage in the voltage sensing device because comparatively low voltage values have to be determined and compared with a predetermined reference voltage.
  • the first voltage sensing device can advantageously have a comparator circuit, which as commercially available comparator is freely available.
  • this comparator circuit can compare the voltage drop at the center tap of the voltage divider with a predetermined first reference voltage and open the electrical switch if the voltage drop exceeds the first reference voltage.
  • a comparatively low voltage value can be used here as the reference voltage, which can easily be obtained from the DC voltage for supplying voltage to the primary side of the voltage converter.
  • a power control circuit for the flyback converter, the power control circuit reducing the output power of the flyback converter when the voltage sensing device opens the switch. If the charging voltage of the first storage capacitor exceeds the predetermined first reference voltage, the electrically controllable switch is opened and if no further measures are provided, the second storage capacitor is charged further with the full flyback converter power. This charging then takes place in very rough stages and very quickly and can possibly lead to an electrical overload of the second storage capacitor and cause its destruction because the dielectric strength of the second storage capacitor is comparatively high, but its capacitance is low. With the measures described above, the converter output power is reduced if only the second storage capacitor is charged, so that an electrical overload of the second Storage capacitor and thus its possible destruction is avoided.
  • the second voltage sensing device can also have a comparator circuit which compares the voltage drop at the center tap of the voltage divider of the second voltage sensing device with a predetermined second reference voltage, and switches off the flyback converter if the voltage drop exceeds the second reference voltage.
  • a comparator circuit which compares the voltage drop at the center tap of the voltage divider of the second voltage sensing device with a predetermined second reference voltage, and switches off the flyback converter if the voltage drop exceeds the second reference voltage.
  • a clock generator is provided for periodically firing the flash tube.
  • the clock frequency of the clock generator and thus the flash frequency of the flashing light warning system according to the invention is advantageously chosen so that it is lower than the charging frequency for charging the first and second storage capacitors, on the one hand to enable reliable ignition of the flash tube with each flash of light and on the other hand to flashes of light with the to generate predetermined light flash energy by the charging voltage of the first capacitor.
  • the power control circuit has an RC element, the charging time constant of which can be changed by a fifth resistor in parallel with a sixth resistor.
  • the RC element determines the basic frequency with which the flyback converter is controlled. If the electrical switch is closed, the sixth resistor is connected in parallel with the fifth resistor, so that the charging time constant of the RC element changes and the frequency with which the flyback converter is driven is changed.
  • a third transistor can be advantageously provided in series with the fifth resistor and in parallel with the sixth resistor, which transistor can be controlled by the voltage sensing device.
  • the positive pole of a voltage source (S), the z. B. an aircraft can be conductively connected to the primary winding of a flyback converter (W), which on the other hand is connected to the negative pole of the voltage source (S) via a second transistor (T2), which is designed as a metal oxide layer field effect transistor.
  • a clock generator (T) is supplied with voltage from the voltage source (S), which generates periodic output signals and thus controls an ignition circuit (Z) which is also supplied with voltage from the voltage source (S).
  • a voltage divider consisting of a first resistor (R1) and a second resistor (R2) is provided in parallel to the first storage capacitor (C1), the resistors of which are on the one hand connected to the cathode, to the first diode (D1) and on the other hand to the negative pole the voltage source (S) are conductively connected.
  • a second capacitor (C2) which is used as a second storage capacitor or auxiliary capacitor, is in parallel with a second voltage divider, consisting of a third resistor (R3) and a fourth resistor (R4), on the one hand with the cathode of the rectifier diode (D1) and on the other hand, conductively connected to the negative pole of the voltage source (S).
  • the voltage at the center tap of the first voltage divider consisting of the first resistor (R1) and the second resistor (R2), is fed to the inverting input of a first comparator circuit (V1), the non-inverting input of which is conductively connected to a reference voltage source (UR).
  • the output of the first comparator circuit (V1) is conductively connected to the control input of the first metal oxide layer field effect transistor (T1) and controls it.
  • the output of the first comparator (V1) is conductively connected to the base of a third transistor (T3) which is designed as a bipolar transistor.
  • the emitter of the third transistor (T3) is connected to a voltage stabilization circuit (US) and to an input of the reference voltage source (UR).
  • the high-frequency oscillator (O) controls the second metal oxide layer field-effect transistor (T2) via a driver or amplifier (A). This control takes place depending on the charging time constant of the RC element, formed from the third capacitor (C3) and the sixth resistor (R6) or formed from the third capacitor (C3) and the sixth resistor (R6) in parallel with the fifth resistor (R5 ). Furthermore, the output signal of the high-frequency oscillator (O) is dependent on the voltages at the center taps of the voltage parts and thus on the output signals of the second comparator (V2) and the third comparator (V3).
  • FIG. 2 shows the output voltage (U1) of the high-frequency oscillator (O) as a function of a time (t), the reference symbol (A), the switch-off time periods and the reference symbol (E) the switch-on time periods of the high-frequency oscillator (O) mark.
  • the circuit of the flashing light warning system according to the invention according to FIG. 1 is de-energized.
  • the high-frequency oscillator (O) begins to oscillate and generates an output voltage (U1) according to FIG. 2a.
  • the first switch-on time period (E1) is constant over a first time period
  • the switch-off time period (A) based on very long switch-off time periods at the beginning of the function of the flashing light warning system according to the invention, in the present exemplary embodiment the first switch-off time period (A1), depending on the time is getting lower and z.
  • B. reaches the second switch-off time (A2) at a predetermined time.
  • the second transistor (T2) is turned on via the amplifier (A), so that current flows through the primary-side winding of the flyback converter (W).
  • the electrical energy that flows through the primary-side winding of the flyback converter (W) leads, after the opening of the second transistor (T2), to a corresponding current flow in the secondary-side winding of the flyback converter (W).
  • the comparatively low voltage of the current source (S) is transformed to values sufficient for the ignition of the flash tube (B) and for the charging of the capacitors (C1 and C2).
  • the second transistor (T2) is opened and the primary-side winding of the flyback converter (W) is separated from the voltage source (S).
  • the current induced in the secondary-side turn of the flyback converter (W) flows rectified via the rectifier diode (D1) to the first storage capacitor (C1) and the second storage capacitor (C2), among other things, and charges these two capacitors, since at this point the first transistor is also charged (T1) is closed.
  • the connection point between the secondary-side turn of the flyback converter (W) and the second diode (D2) or the third diode (D3) has a negative potential which corresponds to the inverting input of the third comparator (V3) is supplied.
  • the output signal of the third comparator (V3) is designed such that the high-frequency oscillator is stopped. That is, as long as a current flows in the secondary-side turn of the flyback converter (W), the oscillator (O) remains ineffective and the output signal of the high-frequency oscillator (O) remains at 0 volts, so that the second transistor (T2) is blocked.
  • the previously described processes continue until the first storage capacitor (C1) has reached a predetermined first voltage threshold value.
  • the charging voltage of the first capacitor (C1) is correspondingly reduced at the first voltage divider, consisting of the first resistor (R1) and the second resistor (R2), and is fed to the first comparator (V1).
  • This comparator (V1) compares the charge voltage value of the first capacitor (C1) with a predetermined threshold value, which is predetermined by the reference voltage source (UR). As soon as the voltage at the center tap of the first voltage divider and thus the charging voltage of the first capacitor (C1) reaches or exceeds the predetermined reference voltage, the output signal of the first comparator circuit (V1) changes its potential, so that the first transistor (T1) is opened.
  • FIG. 2b The corresponding advantageous reduction in the switch-on time (E) is shown in FIG. 2b.
  • the profile of the output voltage (UA) of the high-frequency oscillator is shown over a time (t) after the first transistor (T1) has been opened and the first storage capacitor (C1) has reached its predetermined charging voltage and is no longer charged.
  • the on time (E) is shortened in FIG.
  • the second charging voltage of the second storage capacitor (C2) is also gem in accordance with the flashing light warning system according to the invention.
  • a second voltage divider consisting of the third resistor (R3) and the fourth resistor (R4) are provided, the potential at the center tap of which is directly proportional to the charging voltage of the second storage capacitor.
  • the proportional at the center tap of the second voltage divider is fed to the second comparator (V2), which compares this potential with a threshold voltage likewise specified by a reference voltage source (UR).
  • This threshold voltage usually corresponds to the maximum charging voltage or the dielectric strength of the second storage capacitor (C2) and is usually chosen by the choice of the second capacitor (C2) such that it corresponds to the ignition voltage required for the reliable ignition of the flash tube.
  • the second comparator (V2) changes its output signal at the output and also blocks the high-frequency oscillator (O) via an input. This blocking of the high-frequency oscillator (O) is maintained as long as the potential at the center tap of the second voltage divider or the charging voltage of the second capacitor does not drop. If one assumes that the leakage rates of conventional storage capacitors are usually comparatively low, the high-frequency oscillator (O) is now switched off practically until the flash tube (B) is ignited via the ignition circuit (Z).
  • the clock generator (T) which drives the ignition circuit (Z) periodically.
  • Such periodic generation of flashes of light is e.g. B. when using the flashing warning system according to the invention as a flashing warning system for aircraft, in particular for airplanes, in which such flashing warning systems, for. B. are arranged in the wing ends or on the fuselage of the aircraft.

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  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Claims (17)

  1. Système d'avertissement à éclairs, comprenant une source de tension (S), un convertisseur bloqué (W) relié à la source de tension (S), deux condensateurs d'emmagasinage (C1, C2) reliés au convertisseur (W), un tube à éclats (B) monté en parallèle avec les condensateurs d'emmagasinage (C1, C2), un circuit d'amorçage (Z), un interrupteur électrique (T1) en série avec le premier condensateur d'emmagasinage (C1), ainsi qu'un premier dispositif détecteur de tension électrique qui détermine la tension de charge du premier condensateur d'emmagasinage (C1) et la compare avec une première tension de référence préfixée, caractérisé en ce que l'interrupteur (T1) peut être commandé électriquement et que le premier dispositif détecteur de tension ouvre l'interrupteur (T1) lorsque la tension de charge du premier condensateur d'emmagasinage (C1) dépasse la première tension de référénce.
  2. Système d'avertissement à éclairs selon la revendication 1, caractérisé en ce que le premier dispositif détecteur de tension comporte un diviseur de tension, formé de deux résistances (R1, R2), en parallèle avec le premier condensateur d'emmagasinage (C1).
  3. Système d'avertissement à éclairs selon la revendication 1, caractérisé en ce que le premier dispositif détecteur de tension comporte un circuit comparateur (V1).
  4. Système d'avertissement à éclairs selon les revendications 2 et 3, caractérisé en ce que le circuit comparateur (V1) du premier dispositif détecteur de tension compare la chute de tension sur la prise médiane du diviseur de tension du premier dispositif détecteur de tension avec une première tension de référence préfixée et ouvre l'interrupteur électrique (T1) lorsque la chute de tension dépasse la première tension de référence.
  5. Système d'avertissement à éclairs selon la revendication 1, caractérisé en ce qu'une diode protectrice (D4) est prévue en parallèle avec l'interrupteur électrique (T1).
  6. Système d'avertissement à eclairs selon la revendication 1, caractérisé en ce qu'un circuit de commande de puissance est prévu pour le convertisseur bloqué (W) et que ce circuit de commande diminue la puissance de sortie du convertisseur (W) lorsque le premier dispositif détecteur de tension ouvre l'interrupteur (T1).
  7. Système d'avertissement à éclairs selon la revendication 6, caractérisé en ce que le circuit de commande de puissance comporte un oscillateur (O).
  8. Système d'avertissement à éclairs selon la revendication 7, caractérisé en ce que le circuit de commande de puissance comporte un oscillateur (O) fournissant un signal de sortie sous forme d'impulsions rectangulaires dont la fréquence et/ou la durée d'impulsion est variable électriquement.
  9. Système d'avertissement à éclairs selon la revendication 6, caractérisé en ce que le circuit de commande de puissance comporte un élément RC (R6, C3) dont la constante de temps de charge est variable par une cinquième résistance (R5) montée en parallèle avec une sixième résistance (R6).
  10. Système d'avertissement à éclairs selon la revendication 9, caractérisé par la prévision, en série avec la cinquième résistance (R5) et en parallèle avec la sixième résistance (R6), d'un transistor (T3) par lequel peut être commandé le premier dispositif détecteur de tension.
  11. Système d'avertissement à éclairs selon la revendication 1, caractérisé en ce qu'un second dispositif détecteur de tension est prévu, qui détermine la tension de charge du second condensateur d'emmagasinage (C2) et la compare avec une seconde tension de référence préfixée, et qui coupe le convertisseur (W) lorsque la tension de charge du second condensateur d'emmagasinage (C2) dépasse la seconde tension de référence.
  12. Système d'avertissement à éclairs selon la revendication 11, caractérisé en ce que le second dispositif détecteur de tension comporte un diviseur de tension, formé de deux résistances (R3, R4), en parallèle avec le second condensateur d'emmagasinage (C2).
  13. Système d'avertissement à éclairs selon la revendication 11, caractérisé en ce que le second dispositif détecteur de tension comporte un circuit comparateur (V2).
  14. Système d'avertissement à éclairs selon les revendications 12 et 13, caractérisé en ce que le circuit comparateur (V2) du second dispositif détecteur de tension compare la chute de tension sur la prise médiane du diviseur de tension du second dispositif détecteur de tension avec une seconde tension de référence préfixée et coupe le convertisseur (W) lorsque la chute de tension sur la prise médiane du diviseur de tension du second dispositif détecteur de tension atteint la seconde tension de référence.
  15. Système d'avertissement à éclairs selon la revendication 1, caractérisé en ce qu'un générateur de rythme (T) est prévu pour l'amorçage périodique du tube à éclats (B).
  16. Système d'avertissement à éclairs selon la revendication 1, caractérisé en ce que l'interrupteur est un transistor.
  17. Système d'avertissement à éclairs selon la revendication 16, caractérisé en ce que le transistor est un transistor à effet de champ (T1).
EP90107160A 1989-05-26 1990-04-14 Système d'alarme pour lumière de flash Expired - Lifetime EP0399201B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917062A DE3917062A1 (de) 1989-05-26 1989-05-26 Lichtblitzwarnanlage
DE3917062 1989-05-26

Publications (2)

Publication Number Publication Date
EP0399201A1 EP0399201A1 (fr) 1990-11-28
EP0399201B1 true EP0399201B1 (fr) 1994-01-05

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EP90107160A Expired - Lifetime EP0399201B1 (fr) 1989-05-26 1990-04-14 Système d'alarme pour lumière de flash

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US (1) US5140226A (fr)
EP (1) EP0399201B1 (fr)
DE (1) DE3917062A1 (fr)

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DE4205871A1 (de) * 1992-02-26 1993-09-02 Hella Kg Hueck & Co Lichtblitzwarnanlage
US5347200A (en) * 1993-02-26 1994-09-13 Multi Electric Mfg. Inc. Strobe light switching arrangement with reduced transient currents
DE4333045A1 (de) * 1993-09-29 1995-03-30 Hella Kg Hueck & Co Lichtblitzwarnanlage zum Betrieb in Fahrzeugen
DE19548003A1 (de) * 1995-12-21 1997-06-26 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zur Erzeugung von Impulsspannungsfolgen, insbesondere für den Betrieb von dielektrisch behinderten Entladungen
US20070224827A1 (en) * 2006-03-22 2007-09-27 Ying Xiao Methods for etching a bottom anti-reflective coating layer in dual damascene application
US7456585B2 (en) * 2006-05-11 2008-11-25 Simplexgrinnell Lp Optical element driving circuit
US7994729B2 (en) * 2008-07-21 2011-08-09 Simplexgrinnell Lp Optical element driving circuit
US8907809B2 (en) 2012-05-03 2014-12-09 Abl Ip Holding Llc Visual perception and acuity disruption techniques and systems
US9863902B2 (en) * 2014-03-07 2018-01-09 Stmicroelectronics Asia Pacific Pte Ltd. Microelectronic fluid detector
GB2547568B (en) * 2014-11-28 2019-12-11 Shenzhen City Pixel Enterprise Ltd Flashing lamp control circuit
CN106327975B (zh) * 2016-10-19 2023-04-18 柳州铁道职业技术学院 一种电源屏闪光板电路
TWI790701B (zh) * 2021-08-03 2023-01-21 博盛半導體股份有限公司 利用場效電晶體電容參數的電磁干擾調整器及方法

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Also Published As

Publication number Publication date
EP0399201A1 (fr) 1990-11-28
DE3917062C2 (fr) 1992-11-05
US5140226A (en) 1992-08-18
DE3917062A1 (de) 1990-11-29

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