EP2162675B1 - Strobe light for alarm systems - Google Patents

Strobe light for alarm systems Download PDF

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Publication number
EP2162675B1
EP2162675B1 EP08761016.8A EP08761016A EP2162675B1 EP 2162675 B1 EP2162675 B1 EP 2162675B1 EP 08761016 A EP08761016 A EP 08761016A EP 2162675 B1 EP2162675 B1 EP 2162675B1
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EP
European Patent Office
Prior art keywords
light source
light
microprocessor
switch
flash
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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.)
Not-in-force
Application number
EP08761016.8A
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German (de)
French (fr)
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EP2162675A1 (en
Inventor
Max Grimm
Hansjürg Wälti
Kurt Müller
Antonio Pedrosa
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Siemens Schweiz AG
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Siemens Schweiz AG
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Priority to EP08761016.8A priority Critical patent/EP2162675B1/en
Publication of EP2162675A1 publication Critical patent/EP2162675A1/en
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Publication of EP2162675B1 publication Critical patent/EP2162675B1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • G08B5/38—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources using flashing light

Definitions

  • the present invention relates to a flashing beacon for alarm systems comprising a light source including at least one light emitting diode and a driving circuit comprising a power supply, an inductive buck converter and a flash controller, the inductive buck converter, the light source and the flash controller being connected in series.
  • Such flashing lights are together with the hazard detectors on the detector bus of the alarm system, for example, together with the fire alarms on the detector bus of a fire alarm system.
  • Known flashing lights have a relatively high power consumption of about ten times a scattered light smoke detector. It would therefore be advantageous to use flashing lights with the lowest possible power consumption at a certain effective light intensity. It is obvious that the effective light intensity must not fall below a certain lower limit, because for example, when mounting the flashing lights in long corridors, this is often seen at a shallow angle, so that the perceived by the eye light intensity can be very small.
  • the invention will now be given a flashing light of the type mentioned, which has the lowest possible power consumption and thus improved efficiency.
  • the flashing light has an inductive down converter connected in series with the light source and the flash control.
  • the converter current flows through the LEDs, which is very important because it reduces the power consumption.
  • Another advantage of the inventive solution is that the Efficiency is improved by about a factor of 2 and the current and thus the light emission of the flashing light over a wide voltage range of about 12 to 30 V can be kept relatively constant relatively good.
  • a first preferred embodiment of the flashing beacon according to the invention is characterized in that the inductive buck converter has a control unit, and that this is connected in series with an inductance, an induction barrier and a resistor.
  • the resistor in connection with the control unit keeps the current to the light source constant during the lighting time.
  • the figure shows in the middle part of a six light-emitting diodes (LEDs) 1 containing light source L, in the upper half of their supply and an inductive buck converter W and in the lower part the designated as flash control B control electronics of the light source L.
  • LEDs light-emitting diodes
  • the six forming the light source L.
  • Light-emitting diodes 1 arranged in two parallel branches to three LEDs 1. Flashing lights of the type described are often used in combination with an acoustic alarm, such combined acoustic / optical alarms as a "sounder beacon", or in German “Blitzsummer” are called.
  • the flashing light or the flash buzzer is preferably mounted on the ceiling and has a similar shape as the fire alarm.
  • the supply includes a voltage source 2, which supplies a voltage of, for example, 12 and 30 V, and a current limiter 3 for limiting the current supplied by the voltage source 2 to 3 mA.
  • the reference numeral 5 denotes a current memory formed by a capacitor.
  • the inductive step-down converter W includes a control unit 4, an inductance 6, a diode 7 acting as an induction barrier for the inductance 6, and a resistor 8 acting as a current limiter, at whose output the light source L is located.
  • the control unit 4, the inductor 6, the diode 7 and the resistor 8 are connected in series.
  • the current flowing to the light source L is kept constant during the lighting time to a certain value of, for example, 280 mA. As soon as this value is reached, the power supply is interrupted in the inductive step-down converter W, switched on again after a few hundred milliseconds, and so on. In this way, the interaction of the resistor 8, the inductor 6 and the current transformer 4 results in a significant reduction of the power consumption of the light source L and thus an improvement in the efficiency by about a factor of 2.
  • the flash controller B essentially comprises a microprocessor 9, which is connected, for example via an ASIC to the detector bus of a fire alarm system and from this an operating voltage of 3 V and all required alarm data relates, and two switches 10 for switching on and off the light source L.
  • the microprocessor 9 controls in case of alarm, the two switches 10 so that the LEDs 1, for example, each for 20 ms and then switched off for 1.2 s. It is because of the temperature dependence the luminous intensity of the LEDs depends on the duration of the switch-on of the temperature. For example, the turn-on time of the light-emitting diodes at a temperature of -20 ° is 15 ms, at + 20 ° 20 ms and at + 70 ° 27 ms.
  • the ability to drive the LEDs 1 by the flash controller B in certain pulse shapes also contributes to the reduction of power consumption. You can also interpret the pulse shapes for the control of the light emitting diodes 1 according to the degree of attention to be achieved.
  • the two branches with the light-emitting diodes 1 can be alternately turned on and off to give the impression of a moving light source L, or the strobe light can flash sequentially, with pre-flash and main flash.
  • the flashing light described has the advantage of low power consumption, improved efficiency and a fairly constant light emission over a wide voltage range of 12 to 30 V. It has the maximum effective light intensity for a given power consumption and can also in places where they only under one relatively flat angle is seen, which alert there present reliably.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Fire Alarms (AREA)
  • Audible And Visible Signals (AREA)
  • Alarm Systems (AREA)

Description

Die vorliegende Erfindung betrifft eine Blitzleuchte für Alarmmeldeanlagen mit einer mindestens eine Leuchtdiode enthaltenden Lichtquelle und einer diese antreibenden Schaltung, welche eine Speisung, einen induktiven Abwärtswandler und eine Blitzsteuerung aufweist, wobei der induktive Abwärtswandler, die Lichtquelle und die Blitzsteuerung in Reihe geschaltet sind.The present invention relates to a flashing beacon for alarm systems comprising a light source including at least one light emitting diode and a driving circuit comprising a power supply, an inductive buck converter and a flash controller, the inductive buck converter, the light source and the flash controller being connected in series.

Derartige Blitzleuchten liegen zusammen mit den Gefahrenmeldern auf dem Melderbus der Alarmmeldeanlage, beispielsweise zusammen mit den Brandmeldern auf dem Melderbus einer Brandmeldeanlage. Bekannte Blitzleuchten haben einen relativ hohen Stromverbrauch von etwa dem Zehnfachen eines Streulichtrauchmelders. Es wäre daher vorteilhaft, Blitzleuchten mit einem möglichst geringen Stromverbrauch bei einer bestimmten effektiven Lichtstärke zu verwenden. Es liegt auf der Hand, dass die effektive Lichtstärke eine bestimmte untere Grenze nicht unterschreiten darf, weil beispielsweise bei Montage der Blitzleuchten in langen Gängen diese häufig unter einem flachen Winkel gesehen wird, so dass die vom Auge wahrgenommene Lichtstärke sehr kleine werden kann.Such flashing lights are together with the hazard detectors on the detector bus of the alarm system, for example, together with the fire alarms on the detector bus of a fire alarm system. Known flashing lights have a relatively high power consumption of about ten times a scattered light smoke detector. It would therefore be advantageous to use flashing lights with the lowest possible power consumption at a certain effective light intensity. It is obvious that the effective light intensity must not fall below a certain lower limit, because for example, when mounting the flashing lights in long corridors, this is often seen at a shallow angle, so that the perceived by the eye light intensity can be very small.

Aus dem Datenblatt von NATIONAL SEMICONDUCTOR: " LM2754 800mA Switched Capacitor Flash LED Driver with Time-Out Protection" vom September 2006 und aus der US-Patentanmeldung 2006/0231745 A1 ist eine Treiberschaltungsanordnung für Leuchtdioden bekannt, welche auch für eine derartige Blitzleuchte geeignet ist.From the datasheet of NATIONAL SEMICONDUCTOR: " LM2754 800mA Switched Capacitor Flash Driver with Time-Out Protection "from September 2006 and from the US Patent Application 2006/0231745 A1 a driver circuit arrangement for light-emitting diodes is known, which is also suitable for such a flashing light.

Durch die Erfindung soll nun eine Blitzleuchte der eingangs genannten Art angegeben werden, welche einen möglichst geringen Strombedarf und damit einen verbesserten Wirkungsgrad aufweist.The invention will now be given a flashing light of the type mentioned, which has the lowest possible power consumption and thus improved efficiency.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Blitzleuchte einen in Reihe mit der Lichtquelle und der Blitzsteuerung geschalteten induktiven Abwärtswandler aufweist.This object is achieved according to the invention in that the flashing light has an inductive down converter connected in series with the light source and the flash control.

Bei der erfindungsgemässen Blitzleuchte fliesst also der Wandlerstrom durch die Leuchtdioden, was sehr wichtig ist, weil dadurch der Stromverbrauch reduziert wird. Ein weiterer Vorteil der erfindungsgemässen Lösung liegt darin, dass der Wirkungsgrad um etwa einen Faktor 2 verbessert wird und der Strom und damit die Lichtemission der Blitzleuchte über einen grossen Spannungsbereich von etwa 12 bis 30 V relativ gut konstant gehalten werden können.In the flash lamp according to the invention, therefore, the converter current flows through the LEDs, which is very important because it reduces the power consumption. Another advantage of the inventive solution is that the Efficiency is improved by about a factor of 2 and the current and thus the light emission of the flashing light over a wide voltage range of about 12 to 30 V can be kept relatively constant relatively good.

Eine erste bevorzugte Ausführungsform der erfindungsgemässen Blitzleuchte ist dadurch gekennzeichnet, dass der induktive Abwärtswandler eine Steuereinheit aufweist, und dass diese mit einer Induktivität, einer Induktionssperre und einem Widerstand in Reihe geschaltet ist. Vorzugsweise hält der Widerstand in Verbindung mit der Steuereinheit den Strom für die Lichtquelle während der Leuchtzeit konstant.A first preferred embodiment of the flashing beacon according to the invention is characterized in that the inductive buck converter has a control unit, and that this is connected in series with an inductance, an induction barrier and a resistor. Preferably, the resistor in connection with the control unit keeps the current to the light source constant during the lighting time.

Weitere vorteilhafte Ausführungsformen der erfindungsgemässen Blitzleuchte sind in den abhängigen Ansprüchen 4 bis 10 beansprucht.Further advantageous embodiments of the flash lamp according to the invention are claimed in the dependent claims 4 to 10.

Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels und der einzigen Figur der Zeichnung näher erläutert, welche ein Blockschema einer erfindungsgemässen Blitzleuchte zeigt.In the following the invention will be explained in more detail with reference to an embodiment and the single figure of the drawing, which shows a block diagram of an inventive flashing light.

Die Figur zeigt im mittleren Teil eine sechs Leuchtdioden (LEDs) 1 enthaltende Lichtquelle L, in der oberen Hälfte deren Speisung und einen induktiven Abwärtswandler W und im unteren Teil die als Blitzsteuerung B bezeichnete Steuerelektronik der Lichtquelle L. Darstellungsgemäss sind die sechs die Lichtquelle L bildenden Leuchtdioden 1 in zwei parallelen Ästen zu je drei Leuchtdioden 1 angeordnet. Blitzleuchten der beschriebenen Art werden oft in Kombination mit einem akustischen Alarmgeber verwendet, wobei solche kombinierte akustisch/optische Alarmgeber als "Sounder-Beacon", oder auf Deutsch "Blitzsummer" bezeichnet werden. Die Blitzleuchte oder der Blitzsummer ist vorzugsweise an der Decke montiert und hat eine ähnliche Form wie die Brandmelder. Wegen der Form und des mechanischen Aufbaus der Blitzleuchte oder eines geeigneten Blitzsummers wird auf die EP Anmeldung 07105779.8 der Anmelderin der vorliegenden Patentanmeldung verwiesen, in welcher der mechanische Aufbau der Blitzleuchte ausführlich beschrieben ist. Selbstverständlich könnten auch mehr als zwei parallele Äste mit Leuchtdioden 1 vorgesehen sein.The figure shows in the middle part of a six light-emitting diodes (LEDs) 1 containing light source L, in the upper half of their supply and an inductive buck converter W and in the lower part the designated as flash control B control electronics of the light source L. According to the representation, the six forming the light source L. Light-emitting diodes 1 arranged in two parallel branches to three LEDs 1. Flashing lights of the type described are often used in combination with an acoustic alarm, such combined acoustic / optical alarms as a "sounder beacon", or in German "Blitzsummer" are called. The flashing light or the flash buzzer is preferably mounted on the ceiling and has a similar shape as the fire alarm. Due to the shape and the mechanical structure of the flashing light or a suitable flash buzzer is on the EP application 07105779.8 the applicant of the present patent application, in which the mechanical structure of the flashing light is described in detail. Of course, more than two parallel branches could be provided with light emitting diodes 1.

Die Speisung enthält eine Spannungsquelle 2, die eine Spannung von beispielsweise 12 und 30 V liefert und einen Strombegrenzer 3 für eine Begrenzung des von der Spannungsquelle 2 gelieferten Stroms auf 3 mA. Mit dem Bezugszeichen 5 ist ein durch einen Kondensator gebildeter Stromspeicher bezeichnet. Der induktive Abwärtswandler W enthält einen Steuereinheit 4, eine Induktivität 6, eine als Induktionssperre für die Induktivität 6 wirkende Diode 7 und einen als Strombegrenzer wirkenden Widerstand 8, an dessen Ausgang die Lichtquelle L liegt. Die Steuereinheit 4, die Induktivität 6, die Diode 7 und der Widerstand 8 sind in Reihe geschaltet.The supply includes a voltage source 2, which supplies a voltage of, for example, 12 and 30 V, and a current limiter 3 for limiting the current supplied by the voltage source 2 to 3 mA. The reference numeral 5 denotes a current memory formed by a capacitor. The inductive step-down converter W includes a control unit 4, an inductance 6, a diode 7 acting as an induction barrier for the inductance 6, and a resistor 8 acting as a current limiter, at whose output the light source L is located. The control unit 4, the inductor 6, the diode 7 and the resistor 8 are connected in series.

Durch den Widerstand 8 wird der zur Lichtquelle L fliessende Strom während der Leuchtzeit auf einen bestimmten Wert von beispielsweise 280 mA konstant gehalten. Sobald dieser Wert erreicht wird, wird im induktiven Abwärtswandler W die Stromzufuhr unterbrochen, nach einigen hundert Millisekunden wieder eingeschaltet, und so weiter. Auf diese Weise ergibt das Zusammenwirken des Widerstands 8, der Induktivität 6 und des Stromwandlers 4 eine merkliche Reduktion des Stromverbrauchs der Lichtquelle L und damit eine Verbesserung des Wirkungsgrads um etwa einen Faktor 2.Through the resistor 8, the current flowing to the light source L is kept constant during the lighting time to a certain value of, for example, 280 mA. As soon as this value is reached, the power supply is interrupted in the inductive step-down converter W, switched on again after a few hundred milliseconds, and so on. In this way, the interaction of the resistor 8, the inductor 6 and the current transformer 4 results in a significant reduction of the power consumption of the light source L and thus an improvement in the efficiency by about a factor of 2.

Die Blitzsteuerung B enthält im Wesentlichen einen Mikroprozessor 9, der beispielsweise über einen ASIC an den Melderbus einer Brandmeldeanlage angeschlossen ist und von diesem eine Betriebsspannung von 3 V sowie alle erforderlichen Alarmdaten bezieht, und zwei Schalter 10 für das Ein- und Ausschalten der Lichtquelle L. Der Mikroprozessor 9 steuert im Alarmfall die beiden Schalter 10 so an, dass die Leuchtdioden 1 beispielsweise jeweils für 20 ms ein- und dann für 1,2 s ausgeschaltet werden. Dabei ist wegen der Temperaturabhängigkeit der Leuchtstärke der Leuchtdioden die Dauer der Einschaltzeit von der Temperatur abhängig. So beträgt beispielsweise die Einschaltzeit der Leuchtdioden bei einer Temperatur von -20° 15 ms, bei +20° 20 ms und bei +70° 27 ms. Das bedeutet, dass die Pulsbreite mit der Temperatur steigt. Dieser Temperaturgang der Leuchtstärke der Leuchtdioden 1wird durch einen im Mikroprozessor 9 enthaltenen Sensor, beispielsweise eine Diode (nicht dargestellt) für die Messung der Umgebungstemperatur, korrigiert. Mit Hilfe der beiden Widerstände zwischen den Schaltern 10 und den beiden Ästen mit den Leuchtdioden 1 wird eine gleich helle Leuchtverteilung der Leuchtdioden 1 ermöglicht.The flash controller B essentially comprises a microprocessor 9, which is connected, for example via an ASIC to the detector bus of a fire alarm system and from this an operating voltage of 3 V and all required alarm data relates, and two switches 10 for switching on and off the light source L. The microprocessor 9 controls in case of alarm, the two switches 10 so that the LEDs 1, for example, each for 20 ms and then switched off for 1.2 s. It is because of the temperature dependence the luminous intensity of the LEDs depends on the duration of the switch-on of the temperature. For example, the turn-on time of the light-emitting diodes at a temperature of -20 ° is 15 ms, at + 20 ° 20 ms and at + 70 ° 27 ms. This means that the pulse width increases with temperature. This temperature response of the luminous intensity of the light-emitting diodes 1 is corrected by a sensor contained in the microprocessor 9, for example a diode (not shown) for measuring the ambient temperature. With the help of the two resistors between the switches 10 and the two branches with the light emitting diodes 1, an equally bright light distribution of the LEDs 1 is possible.

Die Möglichkeit, die Leuchtdioden 1 durch die Blitzsteuerung B in bestimmten Pulsformen anzusteuern, trägt ebenfalls zur Reduktion des Stromverbrauchs bei. Man kann die Pulsformen für die Ansteuerung der Leuchtdioden 1 auch nach dem Grad der zu erzielenden Aufmerksamkeit auslegen. So können beispielsweise die beiden Äste mit den Leuchtdioden 1 alternierend ein- und ausgeschaltet werden, um den Eindruck einer sich bewegenden Lichtquelle L zu erwecken, oder die Blitzleuchte kann sequentiell blitzen, mit Vor- und Hauptblitz.The ability to drive the LEDs 1 by the flash controller B in certain pulse shapes, also contributes to the reduction of power consumption. You can also interpret the pulse shapes for the control of the light emitting diodes 1 according to the degree of attention to be achieved. Thus, for example, the two branches with the light-emitting diodes 1 can be alternately turned on and off to give the impression of a moving light source L, or the strobe light can flash sequentially, with pre-flash and main flash.

Diese verschiedenen Möglichkeiten der Ansteuerung der Lichtquelle L sind besonders dann vorteilhaft, wenn die Blitzleuchte an Orten montiert ist, beispielsweise in einem langen Korridor, wo das von der Lichtquelle L ausgesandte Licht nicht unbedingt sofort Aufmerksamkeit erregt.These various ways of controlling the light source L are particularly advantageous when the flashing light is mounted in places, for example in a long corridor, where the light emitted from the light source L does not necessarily attract immediate attention.

Die beschriebene Blitzleuchte hat den Vorteil eines geringen Stromverbrauchs, eines verbesserten Wirkungsgrads und einer einigermassen konstanten Lichtemission über einen grossen Spannungsbereich von 12 bis 30 V. Sie weist bei vorgegebenem Stromverbrauch eine möglichst grosse effektive Lichtstärke auf und kann auch an Orten, wo sie nur unter einem relativ flachen Winkel gesehen wird, die dort Anwesenden zuverlässig alarmieren.The flashing light described has the advantage of low power consumption, improved efficiency and a fairly constant light emission over a wide voltage range of 12 to 30 V. It has the maximum effective light intensity for a given power consumption and can also in places where they only under one relatively flat angle is seen, which alert there present reliably.

Claims (5)

  1. Strobe light for alarm systems comprising a light source (L) containing at least one light-emitting diode (1) and a circuit which powers said light source, said circuit having a feed supply (2) and a flash control device (B), wherein the inductive down converter (W), the light source (L) and the flash control device (B) are connected in series, wherein the inductive down converter (W) has a control unit (4), wherein the control unit (4) is connected in series with an inductor (6), an induction stop (7) and a resistor (8), wherein the resistor (8), in conjunction with the control unit (4), keeps the current to the light source (1) constant during the period of illumination, wherein the flash control device (B) contains at least one switch (10) for actuating the light source (L) and a microprocessor (9) for actuating the at least one switch (10), wherein the microprocessor (9) comprises a data communication connection to the message bus of the alarm system, and wherein the pulse shape of the pulses controlling the at least one switch (10) can be adjusted by means of the microprocessor, wherein the width of the said pulses increases with increasing temperature.
  2. Strobe light according to claim 1, characterised in that the light source (L) comprises several light-emitting diodes (1), which are arranged in the form of two branches and that a switch (10) is assigned to each branch.
  3. Strobe light according to claim 2, characterised in that the pulse shape of the said pulses is controlled by the microprocessor (9) as a function of the ambient temperature and that the microprocessor (9) has a temperature sensor.
  4. Strobe light according to claim 2 to 3, characterised in that the light source (L) is controlled such that the two branches containing the light-emitting diodes (1) are switched on and off alternately.
  5. Strobe light according to claim 2 or 3, characterised in that the light source (L) is controlled such that a sequential flash emission takes the form of preliminary flashes and main flashes.
EP08761016.8A 2007-06-28 2008-06-13 Strobe light for alarm systems Not-in-force EP2162675B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08761016.8A EP2162675B1 (en) 2007-06-28 2008-06-13 Strobe light for alarm systems

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07111333A EP2009350A1 (en) 2007-06-28 2007-06-28 Strobe light for alarm systems
EP08761016.8A EP2162675B1 (en) 2007-06-28 2008-06-13 Strobe light for alarm systems
PCT/EP2008/057495 WO2009000681A1 (en) 2007-06-28 2008-06-13 Flashlight for alarm systems

Publications (2)

Publication Number Publication Date
EP2162675A1 EP2162675A1 (en) 2010-03-17
EP2162675B1 true EP2162675B1 (en) 2016-09-14

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EP07111333A Withdrawn EP2009350A1 (en) 2007-06-28 2007-06-28 Strobe light for alarm systems
EP08761016.8A Not-in-force EP2162675B1 (en) 2007-06-28 2008-06-13 Strobe light for alarm systems

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EP07111333A Withdrawn EP2009350A1 (en) 2007-06-28 2007-06-28 Strobe light for alarm systems

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US (1) US8217580B2 (en)
EP (2) EP2009350A1 (en)
CN (1) CN101688661B (en)
ES (1) ES2607330T3 (en)
HK (1) HK1139452A1 (en)
RU (1) RU2483245C2 (en)
WO (1) WO2009000681A1 (en)
ZA (1) ZA200908946B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2858046B1 (en) 2013-10-01 2019-12-04 Novar GmbH Visual alarm device
US9349288B2 (en) 2014-07-28 2016-05-24 Econolite Group, Inc. Self-configuring traffic signal controller
US10916958B2 (en) 2017-12-21 2021-02-09 Carrier Corporation Optimized adaptive charging method for strobe

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925704A (en) * 1974-10-24 1975-12-09 Hughey And Phillips Lighting system with variable flashing rate
JPS5910718Y2 (en) * 1978-05-18 1984-04-03 ウエスト電気株式会社 Notification device for automatic dimming electronic flash device
US4271408A (en) * 1978-10-17 1981-06-02 Stanley Electric Co., Ltd. Colored-light emitting display
US5422543A (en) * 1993-09-27 1995-06-06 Weinberg; Stanley Flash monitor alarm system
DE69511210T2 (en) 1994-05-13 1999-12-23 Yokohama Rubber Co Ltd TIRES WITH RADIAL CARCASE
US5936599A (en) * 1995-01-27 1999-08-10 Reymond; Welles AC powered light emitting diode array circuits for use in traffic signal displays
JP3708345B2 (en) * 1998-11-25 2005-10-19 株式会社エルテル Light emitting element drive circuit
DE102005012625B4 (en) * 2005-03-18 2009-01-02 Infineon Technologies Ag Method and circuit arrangement for controlling LEDs
RU60293U1 (en) * 2006-09-26 2007-01-10 Евгений Владиславович Двойченко LED LIGHT (OPTIONS)
US7948468B2 (en) * 2007-02-23 2011-05-24 The Regents Of The University Of Colorado Systems and methods for driving multiple solid-state light sources

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US8217580B2 (en) 2012-07-10
ZA200908946B (en) 2011-01-26
CN101688661A (en) 2010-03-31
CN101688661B (en) 2013-05-08
WO2009000681A1 (en) 2008-12-31
EP2162675A1 (en) 2010-03-17
US20100264840A1 (en) 2010-10-21
RU2483245C2 (en) 2013-05-27
HK1139452A1 (en) 2010-09-17
ES2607330T3 (en) 2017-03-30
EP2009350A1 (en) 2008-12-31
RU2010102729A (en) 2011-08-10

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