EP1787886B1 - Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb - Google Patents

Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb Download PDF

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Publication number
EP1787886B1
EP1787886B1 EP05292461A EP05292461A EP1787886B1 EP 1787886 B1 EP1787886 B1 EP 1787886B1 EP 05292461 A EP05292461 A EP 05292461A EP 05292461 A EP05292461 A EP 05292461A EP 1787886 B1 EP1787886 B1 EP 1787886B1
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EP
European Patent Office
Prior art keywords
signal lamp
electrical circuit
voltage
subcircuit
diode
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.)
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EP05292461A
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English (en)
French (fr)
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EP1787886A1 (de
Inventor
Bernd Klose
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THALES RAIL SIGNALLING SOLUTIONS GmbH
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Alcatel Transport Solution Deutschland GmbH
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Priority to EP05292461A priority Critical patent/EP1787886B1/de
Priority to AT05292461T priority patent/ATE382530T1/de
Priority to DE602005004167T priority patent/DE602005004167T2/de
Priority to CN200610148497A priority patent/CN100581308C/zh
Publication of EP1787886A1 publication Critical patent/EP1787886A1/de
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Publication of EP1787886B1 publication Critical patent/EP1787886B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1881—Wiring diagrams for power supply, control or testing
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/357—Driver circuits specially adapted for retrofit LED light sources
    • H05B45/3574—Emulating the electrical or functional characteristics of incandescent lamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L2207/00—Features of light signals
    • B61L2207/02—Features of light signals using light-emitting diodes (LEDs)

Definitions

  • the invention relates to an electrical circuit for operating a signal lamp, with a signal lamp comprising at least one light emitting diode, with a voltage input for supplying the electrical circuit with AC voltage, and with a diode connected in series with the voltage input.
  • Signal lamps are used in a variety of fields, in particular in traffic applications. Of particular importance are railway signal lamps.
  • the signal lamps are used to indicate a train operator whether an upcoming part of a railway track (such as a track switch) can be entered safely.
  • the light of a railway signal lamp must be bright enough for the train operator to recognize the status of the signal lamp well before arriving at the signal lamp.
  • the luminous intensity of the signal lamp must be low enough so the train operator is not dazzled. This means that the luminous intensity of a railway signal lamp should be adapted in the course of a day.
  • railway signal lamps of the state of the art typically use conventional light bulbs as their illuminant.
  • the railway control center modifies the AC input voltage of the railway signal lamps.
  • the light bulbs are operated at a reduced voltage of about 66%, as compared to the voltage used during daytime.
  • the input voltage is switched accordingly in order to have this day/night adaptation.
  • the characteristic of an LED is very different from the characteristic of a light bulb, in particular as far as the correlation between input voltage and luminous intensity is concerned.
  • the existing equipment at railway control centers for adapting the luminous intensity by changing the input voltage is no more suitable.
  • LED signal lamps with variable luminous intensity are provided with a special power supply with a variable current, according to the needs of the LEDs.
  • US2005/0151665A1 describes a signaling control device apparatus for an LED signal lamp, with a sensor for detecting the external light load and a switching power supply.
  • An electrical control system adapts the LED current, and thus the luminous intensity of the LEDs, according to a control signal generated by the sensor.
  • This signalling control device apparatus is incompatible with adapting the luminous intensity by a change of an AC input voltage. Therefore, when retrofitting existing railway signals with LEDs, in the state of the art, it is necessary to retrofit the railway control center and its luminous intensity control system, too. This is rather expensive and cumbersome.
  • EP 0 992 961 A discloses a circuit for replacing signal bulbs with LED circuits without changes in the external circuitry.
  • an electrical circuit as described in the beginning characterized in that the electrical circuit comprises a first subcircuit connecting the cathode of the diode with the signal lamp, that the electrical circuit comprises a second subcircuit providing a low resistance current path in parallel to the signal lamp, as compared to the signal lamp, when the AC voltage is below a first critical level, that the electrical current comprises a third subcircuit disabling the low resistance current path in parallel to the signal lamp, as compared to the signal lamp, when the AC voltage is above the first critical level, and that the electrical circuit comprises a fourth subcircuit providing a low resistance connection from cathode of the diode to the signal lamp, as compared to the first subcircuit, when the AC voltage is above a second critical level.
  • the inventive electrical circuit with its LED based signal lamp imitates the characteristics of a light bulb based signal lamp when switching the input voltage.
  • the inventive electrical circuit is designed to be operated at different voltages of the voltage input. Namely, at a first operation voltage (between first and second critical level), the electrical circuit allows a nighttime operation with a low luminous intensity of the LED based signal lamp. At a second operation voltage (above second critical level), the signal lamp allows a daytime operation with high luminous intensity of the LED based signal lamp.
  • the signal lamp is powered via the first subcircuit. Its components define the current available at the signal lamp.
  • the signal lamp is powered by the fourth subcircuit.
  • the first subcircuit may be negligible or disabled then. So in summary, the distribution of the incoming current between LED(s) and load resistors within the inventive electrical circuit is changed at switching thresholds. By carefully choosing the load resistors, the inventive electrical circuit has, at its voltage input, the characteristic of a conventional light bulb. In particular, the voltage/current characteristic of a conventional light bulb can be imitated with only small steps, resulting in a basically continuous characteristic.
  • an inventive electrical circuit or a number of inventive electrical circuits connected in parallel can take the place of a light bulb of an existing railway signal or other signal, such as a traffic signal.
  • the first subcircuit comprises a supply transistor in series with a resistor, and a resistor connecting the basis of the supply transistor with the signal lamp. Through the supply transistor and the resistor connected to the basis, a low current may be provided for nighttime operation.
  • the first subcircuit can easily be disabled by setting identical voltages to the emitter and the basis of said supply transistor when above the second critical level.
  • the second subcircuit comprises a diverting transistor connected to the signal lamp via at least one resistor, wherein the basis of the diverting transistor is connected to the cathode of the diode via a resistor.
  • the low resistance current path which is in parallel to the signal lamp and via the at least one resistor and the diverting transistor, may be activated by setting a sufficient voltage at the basis of the diverting transistor.
  • the resistor connecting the basis of the diverting transistor and the cathode of the diode is chosen such that a sufficient voltage is set at the basis well before the signal lamp could emit light due to interference voltages.
  • the diverting transistor can easily be disabled by turning off the voltage at the basis.
  • the third subcircuit comprises a disabling transistor, wherein the basis of the disabling transistor is tapping between two resistors connected in series which contact the cathode of the diode and the pole of the voltage input which is not connected to the diode.
  • the two resistors connected in series act as a potential divider and thus the first critical level may easily be chosen.
  • the disabling transistor may easily cooperate with the second subcircuit.
  • the disabling transistor is connected to the basis of the diverting transistor.
  • the diverting transistor loses its voltage at the basis and the diverting transistor conducts no more.
  • a highly preferred embodiment of the inventive electrical circuit is characterized in that the fourth subcircuit comprises a reference element with an output, a control input and a low resistance input, wherein the output of the reference element is connected to the cathode of the diode via a first resistance and a second resistance connected in series, wherein the output of the reference element is connected to the low resistance input of the reference element when the AC voltage is above the second critical level, and that the fourth subcircuit further comprises a field effect transistor connecting the cathode of the diode and the signal lamp, wherein the gate of the field effect transistor taps between the first resistance and the second resistance.
  • the field effect transistor provides a low resistance current path to the signal lamp. It is activated when the reference element gives sufficient voltage to the gate of the field effect transistor.
  • this embodiment provides easy switching of the low resistance current path and an easy determination of the second critical level.
  • the fourth subcircuit further comprises a capacitor connecting the cathode of the diode and the gate of the field effect transistor.
  • the capacitor smoothes the voltage at the gate, i.e. keeps the field effect transistor conducting, over a full period of the AC voltage at the voltage input, as long as the capacitor is reloaded after each period.
  • the signal lamp comprises at least four LEDs, distributed on at least two parallel current paths, in particular wherein in each current path at least two LEDs are connected in series.
  • Each parallel current path works independent from the other parallel current paths, so a failure of one LED does not affect LEDs on another current path. Connecting LEDs in series allows the use of higher voltages and more LEDs with the same equipment.
  • a signal lamp arrangement with at least a first and at least a second inventive electrical circuit as described above, with a common voltage input for the electrical circuits, wherein the at least one first electrical circuit has an opposite polarity with respect to the poles of the common voltage input as compared to the at least one second electrical circuit.
  • This arrangement allows the use of both half waves of the AC voltage. As a result, over a complete period of the AC voltage, there are always LEDs of either the first or the second electrical circuit shining, preventing flickering.
  • the total number of electrical circuits connected in parallel, as well as the number of LEDs per electrical circuit, is chosen with respect to the needed availability of LEDs (which is maximum with one LED per electrical circuit) and the acceptable design costs (which are minimum with all LEDs in just two electrical circuits of opposite polarity).
  • the total number of LEDs is chosen corresponding to the needed maximum luminous intensity of the signal lamp arrangement.
  • a signal lamp arrangement as described above as a railway signal or as a traffic light signal.
  • Fig. 1 shows a schematic circuit diagram of an inventive signal lamp arrangement comprising two inventive electrical circuits 1, 21.
  • the electrical circuits 1, 21 are connected in parallel to a common voltage input V1, with the modification of an opposite polarity.
  • the voltage input V1 provides an alternating current (AC) of sinusoidal type with a voltage of about 6 to 12V (peak voltage). With this voltage, the luminous intensity is controlled.
  • AC alternating current
  • the lower electrical circuit 21 functions identically with the other half wave of the AC voltage.
  • the reference signs of electrical circuit 21 correspond to the reference signs of electrical circuit 1 of a number 20 lower (e.g. resistor R3 in electrical circuit 1 corresponds to resistor R23 in electrical circuit 21).
  • diode D1 In series to the lower pole 2 of voltage input V1, there is a diode D1 functioning as a one way rectifier.
  • the cathode 4 of the diode D1 and the upper pole 3 of the voltage input V1 provide the power supply to the electrical circuit 1.
  • the electrical circuit 1 comprises, as its most important part, a signal lamp 5.
  • the signal lamp 5 comprises four light emitting diodes (LEDs) D3, D4, D5, D6, wherein LEDs D5, D6 are connected in series on a right current path, and LEDs D3, D4 are connected in series on a left current path.
  • LEDs D5, D6 are connected in series on a right current path
  • LEDs D3, D4 are connected in series on a left current path.
  • resistor R4, R3 connected in series for providing a voltage to the LEDs to function.
  • the resistors R3, R4 can also be considered as part of the mentioned current paths and the signal lamp 5.
  • the left and right current path are connected in parallel to a signal lamp input 6.
  • the electrical circuit 1 has three switching thresholds at about 1V (neglect level), about 6V (first critical value, barring unwanted interference voltages below) and about 10V (second critical value, separating nighttime/daylight operation mode) of the AC voltage present at voltage input V1.
  • Low voltages at voltage input V1 are generally set to the signal lamp input 6 via a first subcircuit 11 comprising a supply transistor Q3 and resistors R1, R2.
  • a voltage between the cathode 4 of the diode D1, which corresponds to the emitter of Q3, and the base of Q3 causes some current to flow through R2 and generally provides a current for the signal lamp input 6.
  • a second subcircuit comprising the parts of both reference numbers 12a, 12b comprises a diverting transistor Q1 and a resistor R11 connected to its base.
  • a sufficient voltage is set at R11 and at the base of Q1 so that Q1 becomes conductive.
  • the current flowing through resistor R2 then flows exclusively through R6, R7 and Q1, and not (or only to a negligible part) through the signal lamp 5. As a result, the signal lamp does not shine.
  • the signal lamp 5 At an input voltage above the first critical level of here about 6V, the signal lamp 5 is intended to shine in its nighttime mode.
  • the first subcircuit 11 provides some current to the signal lamp 5, wherein this current is basically determined by the resistor R2.
  • the resistor R1 receiving some of the current running through supply transistor Q3, is used for adapting the characteristic of the signal lamp 5 to the characteristic of a light bulb.
  • the second subcircuit 12a, 12b In this nighttime mode, the second subcircuit 12a, 12b must be deactivated.
  • a third subcircuit 13 comprising a disabling transistor Q2 and two resistors R12, R13.
  • the AC voltage at the cathode 4 is above the first critical value of about 6V, at the base of transistor Q2 there is a voltage high enough to make the disabling transistor Q2 conductive.
  • the voltage at the base of the diverting transistor Q1 breaks down, and Q1 blocks.
  • the low resistance current path via resistors R6, R7 and Q1 is no more available, and the current passing through R2 will also pass through the LEDs D3-D6 of the signal lamp 5. This is the nighttime operation condition.
  • the luminous intensity should be increased significantly for daylight operation. This is achieved by establishing a new low resistance current path from the cathode 4 to the input 6 of signal lamp 5 with a lower resistance than the supply connections of the first current path 11.
  • the new low resistance path allows a relatively high current to flow through the signal lamp 5.
  • This new low resistance current path comprises a field effect transistor (FET) M1, which is part of a fourth subcircuit 14, as marked in Fig. 1.
  • the FET M1 connects the cathode 4 of the diode D1 and the signal lamp input 6.
  • the FET M1 is only conductive when a sufficient voltage is set at the gate 15. Such a sufficient voltage can be set by a reference element U1.
  • the reference element U1 has a control input 16a, a low resistance input 16b and an output 16c.
  • the low resistance input 16b is directly connected to pole 3 of the voltage input V1, and the control input 16a is connected to said pole 3 via resistor R10 which is parallel to a capacitor C2.
  • the output 16c is connected to the gate 15 via a diode D2 and a resistor R5.
  • the low resistance input 16b and the output 16c are connected within reference element U1, and gate 15 gets enough voltage to make FET M1 conductive. Else, i.e. if the voltage at control input 16a is low, the output 16c is not connected and thus of high resistance.
  • the resistors R9, R10 and capacitor C2 are chosen such that the switching in reference element U1 occurs when at the cathode 4 of the diode D1 there is just the second critical voltage level.
  • a sufficient voltage is set by the reference element U1 at gate 15 only during a small time interval of a full AC voltage period, namely near the voltage peak of one half period.
  • a capacitorr C1 smoothes the voltage at the gate 15.
  • Capacitor C1 is discharged via the resistor R8, though.
  • the dimensions of C1, R8 are chosen such that during a full period of the AC voltage, the voltage at gate 15 is kept high enough to keep the FET M1 conductive, but that without a refreshing (charging) of the voltage at C1 by the reference element U1 within the next period or within a few further periods, the FET M1 blocks again.
  • the luminous intensity of the signal lamp 5 at two target voltages can be set independently and at a wide range.
  • a target voltage of 12V is typical for railway applications.
  • the luminous intensity can be reduced to 0.2% of the daylight luminous intensity, in accordance with the invention. This can easily be achieved with the inventive electrical circuit by choosing resistors R2 and R1 accordingly.
  • the comparison of the of the input voltage with the second critical value at reference element U1 on the one hand, and the recording of the state of the fourth subcircuit at C1 during at least one period of the AC voltage on the other hand are separated.
  • This allows a very exact definition of the second critical value at U1, with an accuracy of about 1-2%. It also allows a broad variation of the dwelling time at the output 16c of U1, in particular with the possibility of a quick switching form daylight operation mode to nighttime operation mode.
  • a signal may comprise, e.g., 17 electrical circuits for the positive half wave of the AC voltage, and 17 electrical circuits for the negative half wave.
  • the complete signal apparatus e.g. a railway signal, then comprises a total of 136 LEDs.
  • Fig. 2 shows a circuit diagram of a reference element U1, as it may be used as part of the inventive electrical circuit 1 shown in Fig. 1.
  • the control input 16a and the low resistance input 16b are fed into an operational amplifier, whereas the output 16c is connected to the collector of a transistor. The base of this transistor is connected to the output of the operational amplifier.
  • Fig. 3 illustrates a few parameters (upward axes) within the electrical circuit 1 of Fig. 1 during three periods (time axes t to the right) of the AC voltage during daylight operation mode, here with an AC voltage of about 12V (at the peak).
  • the second diagram (counted from the top) illustrates the output resistance R(16c) at output 16c of reference element U1. Exactly when the scl has been reached by U(4), the resistance R(16c) drops due to switching the output 16c to the low resistance input 16a. In turn, when U(4) drops below scl again, R(16c) rises again.
  • the third diagram illustrates the voltage U(15) at the gate 15 of FET M1, which is identical to the voltage at capacitor C1.
  • R(16c) drops (and concurrently U(4) reaches scl)
  • the charging of capacitor C1 begins.
  • the threshold voltage of FET M1, named sM1 is marked. Over one period, i.e. until the next charging, U(15) stays well above sM1.
  • the fourth diagram indicates the voltage U(M1) from source to drain of FET M1, i.e. from the cathode 4 to the signal lamp input 6.
  • the voltage U(M1) increases in parallel with U(4).
  • the FET M1 becomes conductive, and U(M1) breaks down to a low level.
  • no voltage is present at M1 (zero level).
  • U(M1) is at the low level.
  • the signal lamp 5 shines brightly in daylight mode.

Claims (10)

  1. Elektrische Schaltung (1,21) zum Betreiben einer Signallampe (5),
    mit einer Signallampe (5), welche mindestens eine Licht emittierende Diode (D3, D4, D5, D6) umfasst,
    mit einer Spannungseingabe (V1) zum Versorgen der elektrischen Schaltung (1, 21) mit AC-Spannung,
    und mit einer Diode (D1), welche in Serie mit der Spannungseingabe (V1) verbunden ist,
    dadurch gekennzeichnet,
    dass die elektrische Schaltung (1, 21) eine erste Teilschaltung (11, Q3, R1, R2) umfasst, welche die Kathode (4) der Diode (D1) mit der Signallampe (5) verbindet,
    dass die elektrische Schaltung (1, 21) eine zweite Teilschaltung (12a, 12b, R11, Q1, R6, R7) umfasst, welche einen Strompfad (R6, R7, Q1) mit einem, verglichen mit der Signallampe (5), niedrigeren Widerstand parallel zu der Signallampe (5) bereitstellt, wenn die AC-Spannung unterhalb eines ersten kritischen Levels ist,
    dass die elektrische Schaltung (1, 21) eine dritte Teilschaltung (13, R12, R13, Q2) umfasst, welche den Strompfad (R6, R7, Q1) mit dem, verglichen mit der Signallampe (5), niedrigen Widerstand parallel zu der Signallampe (5) deaktiviert, wenn die AC-Spannung oberhalb des ersten kritischen Levels ist,
    und dass die elektrische Schaltung (1, 21) eine vierte Teilschaltung (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) umfasst, welche eine Verbindung (M1, R3, R4) mit einem, verglichen mit der ersten Teilschaltung (11, Q3, R1, R2), niedrigen Widerstand von der Kathode (4) der Diode (D1) zu der Signallampe (5) bereitstellt, wenn die AC-Spannung oberhalb eines zweiten kritischen Levels (scl) ist.
  2. Elektrische Schaltung (1,21) nach Anspruch 1, dadurch gekennzeichnet, dass die erste Teilschaltung (11, Q3, R1, R2) einen Versorgungstransistor (Q3) in Serie mit einem Widerstand (R1) und einen Widerstand (R2) umfasst, welcher die Basis des Versorgungstransistors (Q3) mit der Signallampe (5) verbindet.
  3. Elektrische Schaltung (1, 21) nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Teilschaltung (12a, 12b, R11, Q1, R6, R7) einen Umlenktransistor (Q1) umfasst, welcher mit der Signallampe (5) über mindestens einen Widerstand (R6, R7) verbunden ist, wobei die Basis des Umlenktransistors (Q1) mit der Kathode (4) der Diode (D1) über einen Widerstand (R11) verbunden ist.
  4. Elektrische Schaltung (1, 21) nach Anspruch 1, dadurch gekennzeichnet, dass die dritte Teilschaltung (13, R12, R13, Q2) einen deaktivierenden Transistor (Q2) umfasst, wobei die Basis des deaktivierenden Transistors (Q2) zwischen zwei Widerständen (R12, R13) abgreift, welche in Serie verbunden sind und die Kathode (4) der Diode (D1) und denjenigen Pol (3) der Spannungseingabe (V1) kontaktieren, welcher nicht mit der Diode (D1) verbunden ist.
  5. Elektrische Schaltung (1, 21) nach Anspruch 3 und 4, dadurch gekennzeichnet, dass der deaktivierende Transistor (Q2) mit der Basis des Umlenktransistors (Q1) verbunden ist.
  6. Elektrische Schaltung (1, 21) nach Anspruch 1, dadurch gekennzeichnet, dass die vierte Teilschaltung (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) ein Referenzelement (U1) mit einer Ausgabe (16c), einer Steuereingabe (16a) und einer Niedrigwiderstandseingabe (16b) umfasst, wobei die Ausgabe (16c) des Referenzelements (U1) mit der Kathode (4) der Diode (D1) über einen ersten Widerstand (R8) und einen zweiten Widerstand (R5) in Serie verbunden ist, wobei die Ausgabe (16c) des Referenzelements (U1) mit der Niedrigwiderstandseingabe (16b) des Referenzelements (U1) verbunden ist, wenn die AC-Spannung oberhalb des zweiten kritischen Levels (scl) ist, und dass die vierte Teilschaltung (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) weiterhin einen Feldeffekttransistor (M1) umfasst, welcher die Kathode (4) der Diode (D1) und die Signallampe (5) verbindet, wobei das Gate (15) des Feldeffekttransistors (M1) zwischen dem ersten Widerstand (R8) und dem zweiten Widerstand (R5) abgreift.
  7. Elektrische Schaltung (1, 21) nach Anspruch 6, dadurch gekennzeichnet, dass die vierte Teilschaltung (14, M1, C1,-R8, R5, D2, U1, R9, R10, C2) weiterhin einen Kondensator (C1) umfasst, welcher die Kathode (4) der Diode (D1) und das Gate (15) des Feldeffekttransistors (M1) verbindet.
  8. Elektrische Schaltung (1,21) nach Anspruch 1, dadurch gekennzeichnet, dass die Signallampe (5) mindestens vier LEDs (D3, D4, D5, D6) umfasst, welche in mindestens zwei parallelen Strompfaden verteilt sind, insbesondere wobei in jedem Strompfad mindestens zwei LEDs (D3, D4, D5, D6) in Serie verbunden sind.
  9. Signallampen-Anordnung,
    mit mindestens einer ersten (1) und mindestens einer zweiten elektrischen Schaltung (21) nach Anspruch 1,
    mit einer gemeinsamen Spannungseingabe (V1) für die elektrischen Schaltungen (1,21),
    wobei die mindestens eine erste elektrische Schaltung (1) eine, verglichen mit der mindestens einen zweiten elektrischen Schaltung (21), entgegengesetzte Polarität bezüglich der Pole (2, 3) der gemeinsamen Spannungseingabe (V1) hat.
  10. Verwendung einer Signallampen-Anordnung nach Anspruch 9 als ein Eisenbahnsignal oder als ein Verkehrslichtsignal.
EP05292461A 2005-11-18 2005-11-18 Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb Not-in-force EP1787886B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP05292461A EP1787886B1 (de) 2005-11-18 2005-11-18 Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb
AT05292461T ATE382530T1 (de) 2005-11-18 2005-11-18 Elektrische schaltung für led signallampen mit einer schaltschwelle zum umschalten zwischen tages- und nachtbetrieb
DE602005004167T DE602005004167T2 (de) 2005-11-18 2005-11-18 Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb
CN200610148497A CN100581308C (zh) 2005-11-18 2006-11-17 用于具有切换阈值的发光二极管信号灯的电路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05292461A EP1787886B1 (de) 2005-11-18 2005-11-18 Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb

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EP1787886A1 EP1787886A1 (de) 2007-05-23
EP1787886B1 true EP1787886B1 (de) 2008-01-02

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EP05292461A Not-in-force EP1787886B1 (de) 2005-11-18 2005-11-18 Elektrische Schaltung für LED Signallampen mit einer Schaltschwelle zum Umschalten zwischen Tages- und Nachtbetrieb

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EP (1) EP1787886B1 (de)
CN (1) CN100581308C (de)
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Cited By (2)

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DE102008025187A1 (de) * 2008-05-23 2009-12-03 Siemens Aktiengesellschaft Signalgeber für ein LED-Lichtsignal
EP2445318A1 (de) 2010-10-15 2012-04-25 Thales Rail Signalling Solutions GmbH LED-Signallampe mit Konstantstrombetrieb

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DE102008029725A1 (de) * 2008-06-23 2010-01-07 Siemens Aktiengesellschaft Signalgeber
EP2463174B1 (de) * 2010-12-09 2013-10-30 Siemens Schweiz AG Vorrichtung und Verfahren zur Realisierung eines Glühlampenersatzes für ein Lichtsignal
GB2495120B (en) * 2011-09-29 2015-11-18 Howells Group Plc Railway light signals
US10104730B2 (en) * 2017-03-07 2018-10-16 B/E Aerospace, Inc. LED bulb and method for operating same
CN116437201B (zh) * 2023-06-13 2023-10-10 深圳比特微电子科技有限公司 摄像头防持续明暗震荡方法、装置和摄像头系统

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WO1995012512A1 (de) * 1993-11-05 1995-05-11 Siemens Integra Verkehrstechnik Ag Schaltungsanordnung zur abgabe von optischen signalen
DE19846753A1 (de) * 1998-10-07 2000-04-13 Siemens Ag Schaltungsanordnung zum Betreiben eines Leuchtzeichens
GB2408834B (en) * 2001-12-11 2005-07-20 Westinghouse Brake & Signal Signal lamps and apparatus
DE10164561B4 (de) * 2001-12-14 2004-03-04 Siemens Ag Schaltungsanordnung zum Betreiben eines LED-Signals
DE10221573B4 (de) * 2002-05-08 2004-03-18 Siemens Ag Schaltungsanordnung zum Betreiben eines Leuchtzeichens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008025187A1 (de) * 2008-05-23 2009-12-03 Siemens Aktiengesellschaft Signalgeber für ein LED-Lichtsignal
EP2445318A1 (de) 2010-10-15 2012-04-25 Thales Rail Signalling Solutions GmbH LED-Signallampe mit Konstantstrombetrieb

Also Published As

Publication number Publication date
CN100581308C (zh) 2010-01-13
CN1968554A (zh) 2007-05-23
ATE382530T1 (de) 2008-01-15
DE602005004167T2 (de) 2008-12-24
DE602005004167D1 (de) 2008-02-14
EP1787886A1 (de) 2007-05-23

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