WO2003061347A1 - Appareil d'eclairage transmetteur de signaux comportant des diodes electroluminescentes - Google Patents

Appareil d'eclairage transmetteur de signaux comportant des diodes electroluminescentes Download PDF

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Publication number
WO2003061347A1
WO2003061347A1 PCT/EP2003/000427 EP0300427W WO03061347A1 WO 2003061347 A1 WO2003061347 A1 WO 2003061347A1 EP 0300427 W EP0300427 W EP 0300427W WO 03061347 A1 WO03061347 A1 WO 03061347A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
light
circuit
light according
voltage
Prior art date
Application number
PCT/EP2003/000427
Other languages
German (de)
English (en)
Inventor
Reiner Kirschke
Fabian Zink
Original Assignee
Stührenberg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10201906A external-priority patent/DE10201906B4/de
Priority claimed from DE10201908A external-priority patent/DE10201908C1/de
Application filed by Stührenberg GmbH filed Critical Stührenberg GmbH
Priority to AU2003206740A priority Critical patent/AU2003206740A1/en
Publication of WO2003061347A1 publication Critical patent/WO2003061347A1/fr

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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
    • 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
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to a signal lamp with a circuit board, on which light-emitting diodes are arranged in a plurality of parallel series circuits, each of which is driven by a transistor connected as a current source, these series circuits being connected together to a supply voltage via a circuit determining their total current.
  • Such signal lights are known from DE 29 25 692.
  • the transistors are connected as maximum current sources in that the light-emitting diodes are connected in the source path of a MOSFET. If individual LEDs fail due to an internal short circuit, the monitored current remains unaffected.
  • the maximum total current is limited by a MOSFET current source transistor. Failures of individual light-emitting diode series circuits are not monitored, but a different current distribution of the total current to the individual branches occurs if one or more current branches fail, if the sum of the individual maximum current limits of all branches is greater than the overall limited maximum current. In this way, brightness compensation occurs when individual branches fail. The reporting of a malfunction is in one such a case of redundancy utilization is not provided. Even if so many branches of the light-emitting diode arrays fail that the total current is undercut, there is no message for the supply circuit.
  • the transistors are connected to current-determining emitter resistors and are connected on the base side via series resistors to a reference voltage, which is determined by a Zener diode and at least one additional voltage source, which is controlled by a bridge circuit so that the total current is approximately constant is held when some of the series circuits fail.
  • a light-emitting diode fails due to an interruption or the current source transistor of a series circuit, the effect of the control circuit has practically no effect on the current consumption of the overall circuit. Since the number of light-emitting diodes is at most eight, preferably six or fewer, the number of light-emitting diode series is accordingly 12 or more, preferably 15 to 18, if the standard brightness of conventional traffic signals plus a reserve with commercially available light-emitting diodes is to be provided. As a result, the brightness is still above the permissible lower limit if no more than 20% of the light-emitting diodes, for example three series of 15, have failed. A total shutdown is only required if a fourth series of 15 fails. 18 deraille, each with five LEDs, are also a useful grouping.
  • the series connections of six light-emitting diodes can advantageously be operated in each case with a reference voltage of a Zener diode, as well as a regulator voltage source and / or a control voltage source placed thereon.
  • the supply voltage is obtained by a full-wave rectification of a 24 V low voltage.
  • One of the regulator voltage sources preferably serves to stabilize the overall current in the event of failure of individual light-emitting diode chains, and another regulator voltage source serves to increase the current in the event of extreme external light incidence. Since the rectified peak voltage is 33.6V, a voltage of 16V, at which the maximum current has already been reached, is reached at a phase angle of 30 ° and exceeded up to 150 °, so that a full LED current flows at least 80% of the time.
  • the light-emitting diodes of the individual series circuits are advantageously statistically mixed on the switching
  • the circuit board is distributed so that even if the maximum number of series connections fails, there is no misleading, meaningful pattern from the dark areas.
  • the openings under each of the light emitting diodes are arranged and are only large enough that the crystal of the light emitting diode covers the corresponding opening and that the light emitting diode has a diode housing on the side and side of the board.
  • the white-looking, light-scattering diode housing serves as a light guide for secondary light emerging laterally from the LED crystal and light reflecting from the interfaces of the lens, which reaches the rear through the diode housing through the circuit board hole into the rear luminaire room, where the at least one sensor is arranged ,
  • Incident sunlight is focussed on the front of the crystal through the diffusing screen and is intercepted there and shaded against the circuit board opening on the back.
  • the board is preferably i.a. impermeable to light through the conductor tracks that serve to energize the diode.
  • the detection of the light-emitting diode light passing through the cutouts by only a few or one sensor is favored by reflective, in particular white, surfaces of the space located to the rear of the printed circuit board.
  • the board is also preferably white on the back.
  • the light-emitting diode housing is closed off at the front by a clear focusing lens or disk.
  • the side and the rear part of the diode housing widens diverging from the centrally inserted crystal towards the lens, the angle of the housing extension roughly corresponding to the physically determined radiation angle of the crystal.
  • the emitted light is predominantly fed to the lens and is emitted by the lens as useful light through the lens. Only a small but always defined portion of the diode light finds its way through the diode housing and the hole in the board to the sensor. In contrast, the maximum amount of sunlight reaching the sensor is irrelevant. This prevents the light sensor from entering the non-linear saturation range when bright sunlight hits the lens.
  • the LEDs are operated with clocked DC voltage, the LED light on the light sensor generates an alternating signal with the clock frequency. If the light-emitting diodes are operated in direct voltage mode, the sensor lighting changes suddenly when switching on and off a signal phase.
  • the level of the alternating light signal component or the step signal component is evaluated in each case and compared with one or more predefined threshold values, and if one of the higher threshold values is undershot and the lowest threshold value is undershot, a fault warning or a fault message is output by switching off.
  • a change in the brightness of the large number of light-emitting diodes of a signal light occurs due to aging of the light-emitting diodes, through a change in the ambient temperature, through a change in the supply voltage and through failure of individual light-emitting diodes or of a light-emitting diode group connected in series.
  • the light emitting diode voltage or the current is usually stabilized to a maximum, so that the monitoring essentially detects the aging limits and an impermissible number of failures. Since these processes take years or occur relatively infrequently, a malfunction notification provides the option of replacing the circuit board with the light-emitting diodes as part of a general inspection before such a malfunction occurs that causes the signal system to be switched off and therefore requires special maintenance.
  • the quasi-constant sensor signal component is preferably derived by a low-pass filter, which corresponds to the irradiated ambient lighting.
  • the current supply to the light-emitting diodes is advantageously controlled higher, so that better visibility of the signal light is achieved under unfavorable lighting conditions, but otherwise no unnecessary current is consumed, which would also accelerate aging.
  • FIGS. 1-7 Advantageous configurations are shown in FIGS. 1-7.
  • Fig. 1 shows a section of the LED series circuits
  • Fig. 2 shows the feed circuit and monitoring circuit
  • Fig. 3 shows a timing chart
  • Fig. 4 shows a light emitting diode arrangement
  • Fig. 5 shows a cross section through a traffic signal lamp
  • Fig. 7 shows schematically a light sensor signal evaluation circuit.
  • the current source consists in each case of an emitter follower transistor T1, T2 ... T15, or a correspondingly switched MOSFET transistor whose control electrode 10 is acted upon by a reference voltage REF, each of which is supplied by a bidirectionally rectified supply voltage US through a series resistor 21 and one connected to ground Zener diode 20 and voltage source transistors UT1, UT2, which are negative-coupled and are fed with regulator currents at their base.
  • the supply voltage US is obtained from an AC voltage by means of full-wave rectification, and is supplied via the series of light-emitting diodes L1-L90 to the collector 12 of the transistor T1, T2 ... T15, the emitter of which is connected to a common measuring resistor via a current-determining negative feedback resistor RG RM is connected to ground, at which a total current measurement signal IG drops.
  • the reference voltage REF which is fed to the individual current source transistors Tl-T15 of the series circuits which are decoupled with emitter resistors RE, via decoupled base resistors RB, consists of two or three components. The first determines a minimum current component and is obtained with a zener diode 20, the zener current of which is supplied via a series resistor 21 from the supply voltage US.
  • a second lower current component is determined by a control voltage source UTl, which consists of a transistor fed with a negative feedback resistor GRl from the collector to the base, the base of which is fed by a comparator circuit VB, a bridge circuit B, one branch of which is made up of the LED series and the measuring resistor RM and the like another branch consists of bridge resistors RBl, RB2, which is fed by a reference voltage REF1, which does not include the voltage of the control voltage source UTl.
  • the comparator circuit consists of a current mirror circuit which is fed to the measuring transistor VB via a resistor RK from the Zener diode voltage UZ.
  • the current control loop is closed and the current in the measuring resistor RM is approximately constant, even if individual series circuits of the light-emitting diodes fail. If individual LED series fail, this current regulator circuit ensures the constancy of the total current and a corresponding increase in the individual currents through a Adaptation of the reference voltage REF increased with the first control voltage source UT1.
  • the respective control current generates a measurement voltage in the resistor RK, which is a measure for the detuning of the bridge B and is fed directly or inverted with an inverter I to earth as a measurement signal MS of the monitoring circuit 3.
  • RK resistor
  • I inverter
  • a control voltage source UT2 which lies outside the current control loop, supplies the third component of the reference voltage REF.
  • the control voltage source UT2 also consists of a transistor connected from the collector to the base with a negative feedback resistor GR2. Its base is powered by a power source that delivers a current depending on a measurement of the ambient brightness caused by sunlight.
  • the brightness measurement signal HS supplies a suitably arranged photo element PH via a low-pass filter TP, so that the changing brightness of the light-emitting diodes, which are fed with half-waves, does not produce any signal component.
  • the circuit which generates the reference voltage REF is advantageously bridged with a capture zener diode AZ which limits the reference voltage REF to a maximum value and in the event of faults in the control or Regulator circuit is effective and then limits the maximum current of the LEDs.
  • Fig. 2 shows a supply circuit and the monitoring circuit 3.
  • the mains voltage UN is reduced in the transformer TR to a low voltage of 24 V and via two normally closed contact sets RR1, RR2 of fault signaling relay R1, R2 to a full-wave rectifier GL which supplies the half-wave voltage as supply voltage US to the series circuits S1 - S15.
  • the supply voltage US is also led via a diode D to a smoothing circuit C, which supplies a supply voltage UV for the monitoring circuit 3.
  • first comparator VI to which the measurement signal MS is fed at an input, which signals the respective current level in the series circuits and, because of its half-wave supply, consists of a sequence of 100 Hz pulses which, owing to the voltage source feed are flattened.
  • the second comparator input is connected to a first comparison voltage RV1, which is obtained analogously to the reference voltages REF, the series circuits with a Zener diode ZI, but with a lower Zener voltage and a voltage divider, from the pulsating supply voltage US, and thus a similar, but somewhat more likely, saturation flattening , temporal course as the measurement signal MS.
  • the first comparison voltage RV1 is set by the voltage divider to such a level that it is always exceeded by the measurement signal MS when at least 80% of the series circuits S1-S15 are live, ie in the example at most three of the series circuits have failed.
  • the first comparator VI provided with a hysteresis outputs a 100 Hz pulse series IS at its output.
  • a clock signal CLK is generated with a second hysteresis comparator V2, which consists of a constant reference voltage RV2 and a 100 Hz signal sequence derived from the pulsating supply voltage US, each of which exceeds the associated reference voltage RV2 in a shorter period of time than the measurement voltage MS of its reference voltage RVl possibly exceeds.
  • the two comparator output signals IS, CLK are combined in an antivalence gate circuit AG, so that a 200 Hz pulse signal PS is present at their output because of the different duration of the two mutually centered pulse signals if the measuring voltage MS reaches the prescribed level.
  • an equivalent gate circuit can optionally be used to get a 200 Hz pulse signal.
  • the pulse signal PS is then divided into two separate signal paths, on each of which the presence of the pulse signal PS is checked by a time filter F1, F2, the output signal of which keeps a shunt transistor TS1, TS2 switched on as long as the 200 Hz pulse signal PS is present.
  • the shunt transistors TSl, TS2 are each parallel to a fault relay Rl, R2, which is bistable and is in series with a supply circuit, the supply current of which is derived when the shunt TSl, TS2 is switched on.
  • the associated fault signaling relay R1, R2 switches over and switches the entire device off and on the network side emits the alarm message AM.
  • a test button PT1, PT2 is provided in each branch of the pulse signal PS, the actuation of which simulates a malfunction and the corresponding relay must trigger the disconnection process.
  • Fig. 3 shows the waveforms on the comparators VI, V2 and the antivalence gate AG.
  • FIG. 4 shows an example of a statistical distribution of 15 series of 6 light-emitting diodes on a circular area, the series-associated light-emitting diodes L1-L6, L7-L12, etc., each having the same reference letters A-P.
  • the distribution is chosen in such a way that no significant light pattern is produced even with any three failed series A - P.
  • the monitoring circuit which monitors the measurement signal MS in a first comparator VI with respect to a first reference voltage value RV1, can be expanded in a corresponding manner with a further comparator which is set to a higher reference voltage and, for example, if only three of the series circuits S1-S15 fail triggers a warning that can be triggered with suitable means, e.g. with short-term or frequency signals, is output to the control systems via the network connection or another communication path.
  • suitable means e.g. with short-term or frequency signals
  • FIG. 5 shows a cross section of a traffic signal light, which has a housing 10, which is closed at the front with a diffusing screen 11, behind which a circuit board 1 is arranged at a distance, which carries LED light-emitting diodes Lx on the front, which are wired to the circuit board with a voltage supply, are connected in particular by means of current source circuits with current limitation of the half-waves.
  • the light-emitting diodes Lx consist of a light-emitting diode crystal plate 26 which is arranged approximately centrally in a light-emitting diode housing 22 parallel to the circuit board 1, which is funnel-shaped from the crystal and has a clear lens 27 or a disk 28 - shown in broken lines - in front of this conical recess 23. finally wears.
  • the diode housing 22 is laterally and in its rear wall 24 made of translucent, light-scattering material that directs light emitting diode to the rear wall 24 of the diode housing, which exits there.
  • the circuit board 1 has an opening 17, in particular a bore, under the light-emitting diode crystals 26, the opening width W of which is smaller than the crystal dimensions A, so that the crystal 26 in each case fully covers the hole 17 underneath.
  • Diode light which arrives at the diode housing rear wall 24 via the diode housing 22 and exits there, passes through the bore 17 and strikes one or more scattered at least one light sensor 30, which is arranged on the rear side of the circuit board 1.
  • the walls of the room, which is enclosed by the circuit board 1 and the rear wall of the lamp 14, are advantageously coated with a light-scattering layer 2B, 14B, in particular white or silvery color, and the bore 17 is preferably edge-side with a metallic coating of the type Via 18 provided that supports the flow of light.
  • the light from the numerous light-emitting diodes mixes in the white rear space in such a way that a few photosensors 30 or even just one are sufficient to generate a sensor signal SS which contains an appropriate signal component from all light-emitting diodes. Due to the shading of incident sunlight, so little reaches the sensor that it always works in the linear sensitive range.
  • Fig. 6 shows the area with a light emitting diode 20 enlarged and axially cut.
  • the light that is emitted centrally in the light-emitting diode crystal 26 usually spreads out at an angle of approximately 60 ° and is largely parallelized by the lens 27 and thus falls on the lens 11, which is optically active, e.g. prismatic and cylindrical structure is provided, which produces a prescribed asymmetrical light distribution on the outlet side.
  • Incident parallel sunlight is broken down into bundles by the lens structure and possibly focused by the lenses 27 onto the light-emitting diode crystals 26.
  • This crystal 26 is in each case opaque and, because of its larger dimension A, shades the hole 17 of the width W lying underneath.
  • Dash-dotted lines indicate a path of the light-emitting diode radiation which is reflected on the inner lens surface and is guided from the diode housing 22 to its rear wall 24 and from there falls through the bore 17 and along its reflective lining 18 onto the white scattering surface 14B. Their scattered light spreads between the opposite white scattering surfaces 14B, 2B until it reaches the light sensor 30.
  • the diode housing 22 is tapered behind the lens 27 from the front of the crystal 26 at a larger angle than its light emission angle.
  • FIG. 7 shows an evaluation circuit 31 of the sensor signal SS, which is differentiated and / or band-filtered in a filter circuit 32, which may result in a continuous exposure signal component, e.g. stems from scattered light from the sun, is suppressed or branched off for control purposes as an ambient brightness signal UHS and the useful light signal NS is separated.
  • a continuous exposure signal component e.g. stems from scattered light from the sun
  • This signal NS of the light-emitting diode brightness is supplied to at least one first comparator Vll, to which a first threshold value SW1 is supplied at the other input.
  • a clock signal TS is obtained from the power supply NT of the light-emitting diodes Lx each at the time of the maximum of the half-wave drive voltage, with which the negated output signal of the comparator Vll is passed to a first holding circuit 33 so that when the first threshold value SW1 is undershot the useful holding signal NS sets the first holding circuit 33, which emits a prewarning signal VW, for example as a short-term signal to a first relay R11 in the control circuit IQ of the light-emitting diodes Lx, which can be measured on the side of the AC voltage supply.
  • a second comparator V21 is fed with the useful light signal NS and a second, relatively lower threshold value SW 2, the inverted output signal of which is transferred to a fault message memory 34 with the clock signal TS.
  • the fault message SM is used, for example, via a second relay R21 to switch off the diodes Lx.
  • the fault states WV, SM are reported externally to the control center (not shown).
  • the holding circuits 33, 34 are reset with a switch RS during maintenance or repair.
  • the ambient brightness signal part UHS is advantageously used in an energization control circuit BS to raise the maximum light-emitting diode current, which is supplied to the light-emitting diodes Lx connected in chains from maximum current sources IQ.
  • R1, R2 relays

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un appareil d'éclairage transmetteur de signaux, comportant une platine de connexion sur laquelle des diodes électroluminescentes sont disposées en plusieurs couplages en série parallèles, qui sont régulés dans chaque cas, par l'intermédiaire d'un transistor commuté comme une source de courant. Ces couplages en série sont connectés conjointement, par l'intermédiaire d'un circuit déterminant leur courant global, à une tension d'alimentation redressée. Les transistors sont câblés avec des résistances série de l'émetteur déterminant le courant et côté base, dans chaque cas à une tension de référence par l'intermédiaire de résistances préliminaires, ladite tension de référence étant déterminée par une diode de Zener et au moins une autre source de courant, régulée par l'intermédiaire d'un circuit en pont, de sorte que le courant global soit maintenu approximativement constant, lorsque certains des couplages en série se trouvent sans courant et s'arrêtent.
PCT/EP2003/000427 2002-01-19 2003-01-17 Appareil d'eclairage transmetteur de signaux comportant des diodes electroluminescentes WO2003061347A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003206740A AU2003206740A1 (en) 2002-01-19 2003-01-17 Signal light comprising light-emitting diodes

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10201906A DE10201906B4 (de) 2002-01-19 2002-01-19 Signalgeberleuchte mit Leuchtdioden
DE10201908.8 2002-01-19
DE10201908A DE10201908C1 (de) 2002-01-19 2002-01-19 Verkehrssignalleuchte mit Leuchtdioden
DE10201906.1 2002-01-19

Publications (1)

Publication Number Publication Date
WO2003061347A1 true WO2003061347A1 (fr) 2003-07-24

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PCT/EP2003/000427 WO2003061347A1 (fr) 2002-01-19 2003-01-17 Appareil d'eclairage transmetteur de signaux comportant des diodes electroluminescentes

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AU (1) AU2003206740A1 (fr)
WO (1) WO2003061347A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2399236A (en) * 2003-03-07 2004-09-08 Wen-Hsin Chao Control and protection circuit of LEDs
WO2005079121A2 (fr) * 2004-02-11 2005-08-25 Peter Bhagat Appareil de commande d'eclairage et procedes associes
CN102843805A (zh) * 2011-06-20 2012-12-26 延锋伟世通汽车电子有限公司 一种用于汽车的多路恒流照明电路
US20220006259A1 (en) * 2018-11-16 2022-01-06 Sony Semiconductor Solutions Corporation Detection circuit, driving circuit, and light emitting device
US20220006258A1 (en) * 2018-11-27 2022-01-06 Sony Semiconductor Solutions Corporation Drive device and light emitting device

Citations (8)

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Publication number Priority date Publication date Assignee Title
DE9002812U1 (de) * 1990-02-13 1990-06-07 Siemens AG, 1000 Berlin und 8000 München Infrarot-Scheinwerfer
WO1998049872A1 (fr) * 1997-04-30 1998-11-05 Signal House Limited Feux de signalisation
WO1999039319A2 (fr) * 1998-01-29 1999-08-05 Ledi-Lite Ltd. Enseigne lumineuse
DE19910142A1 (de) * 1999-02-26 2000-09-21 Siemens Ag Schaltung zum Betreiben eines LED-Lichtzeichens
NL1015217C2 (nl) * 1999-05-17 2001-01-09 Nederland Haarlem Traffic B V Lichtsignaal.
DE19929430A1 (de) * 1999-06-26 2001-01-11 Abb Daimler Benz Transp Leuchtdioden-Schlußleuchte
EP1079667A2 (fr) * 1999-08-19 2001-02-28 Schott Fibre Optics (UK) Ltd Dispositif de commande d'éclairage
DE19950135A1 (de) * 1999-10-18 2001-04-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Ansteuerschaltung für LED und zugehöriges Betriebsverfahren

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9002812U1 (de) * 1990-02-13 1990-06-07 Siemens AG, 1000 Berlin und 8000 München Infrarot-Scheinwerfer
WO1998049872A1 (fr) * 1997-04-30 1998-11-05 Signal House Limited Feux de signalisation
WO1999039319A2 (fr) * 1998-01-29 1999-08-05 Ledi-Lite Ltd. Enseigne lumineuse
DE19910142A1 (de) * 1999-02-26 2000-09-21 Siemens Ag Schaltung zum Betreiben eines LED-Lichtzeichens
NL1015217C2 (nl) * 1999-05-17 2001-01-09 Nederland Haarlem Traffic B V Lichtsignaal.
DE19929430A1 (de) * 1999-06-26 2001-01-11 Abb Daimler Benz Transp Leuchtdioden-Schlußleuchte
EP1079667A2 (fr) * 1999-08-19 2001-02-28 Schott Fibre Optics (UK) Ltd Dispositif de commande d'éclairage
DE19950135A1 (de) * 1999-10-18 2001-04-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Ansteuerschaltung für LED und zugehöriges Betriebsverfahren

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2399236A (en) * 2003-03-07 2004-09-08 Wen-Hsin Chao Control and protection circuit of LEDs
GB2399236B (en) * 2003-03-07 2005-03-16 Wen-Hsin Chao Control and protection circuit of leds
WO2005079121A2 (fr) * 2004-02-11 2005-08-25 Peter Bhagat Appareil de commande d'eclairage et procedes associes
WO2005079121A3 (fr) * 2004-02-11 2005-11-17 Peter Bhagat Appareil de commande d'eclairage et procedes associes
US8487545B2 (en) 2004-02-11 2013-07-16 Peter Bhagat Apparatus for the control of lighting and associated methods
CN102843805A (zh) * 2011-06-20 2012-12-26 延锋伟世通汽车电子有限公司 一种用于汽车的多路恒流照明电路
CN102843805B (zh) * 2011-06-20 2016-06-29 延锋伟世通汽车电子有限公司 一种用于汽车的多路恒流照明电路
US20220006259A1 (en) * 2018-11-16 2022-01-06 Sony Semiconductor Solutions Corporation Detection circuit, driving circuit, and light emitting device
US11962124B2 (en) * 2018-11-16 2024-04-16 Sony Semiconductor Solutions Corporation Detection circuit, driving circuit, and light emitting device
US20220006258A1 (en) * 2018-11-27 2022-01-06 Sony Semiconductor Solutions Corporation Drive device and light emitting device
US11996673B2 (en) * 2018-11-27 2024-05-28 Sony Semiconductor Solutions Corporation Drive device and light emitting device

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