EP2510750B1 - Circuit d'excitation pour une del - Google Patents

Circuit d'excitation pour une del Download PDF

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Publication number
EP2510750B1
EP2510750B1 EP10807425.3A EP10807425A EP2510750B1 EP 2510750 B1 EP2510750 B1 EP 2510750B1 EP 10807425 A EP10807425 A EP 10807425A EP 2510750 B1 EP2510750 B1 EP 2510750B1
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EP
European Patent Office
Prior art keywords
led
driver circuit
switch
hand movement
circuit
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.)
Active
Application number
EP10807425.3A
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German (de)
English (en)
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EP2510750A1 (fr
Inventor
Thomas Dumka
Stefan Zudrell-Koch
Horst Knödgen
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
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Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2510750A1 publication Critical patent/EP2510750A1/fr
Application granted granted Critical
Publication of EP2510750B1 publication Critical patent/EP2510750B1/fr
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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges

Definitions

  • the invention relates to a driver circuit for an LED according to the preamble of patent claim 1 and a method for driving an LED according to the preamble of patent claim 12.
  • Such driver circuits are used in lighting systems to achieve a colored or flat lighting of rooms, paths or escape routes.
  • the bulbs are driven by operating devices and activated as needed.
  • organic or inorganic light emitting diodes LED are used as the light source.
  • light-emitting diodes are also increasingly being used as the light source.
  • the efficiency and luminous efficacy of light-emitting diodes is being increased more and more so that they are already being used in various general lighting applications.
  • light emitting diodes are point sources of light and emit highly concentrated light.
  • a change in brightness is often only possible with a complex control circuit, a simple connection to standard dimmers is not given, as it comes in conjunction with most dimmers to a flicker of light or dimmers do not work. In addition, the change in color and brightness is hardly possible separately.
  • the EP 1 871 144 A1 describes a driver circuit for LEDs.
  • a current sensor detects a current and returns a current indicating signal via an optocoupler to a driver control.
  • the DE 102 39 449 A1 and the DE 10 2006 025 597 A1 disclose lights that are designed for touch control.
  • a touch sensor is provided for detecting the touch.
  • the WO 2005/022963 A1 which serves as a basis for the preamble of the independent claims, discloses a lighting device with a capacitive proximity sensor.
  • a driver circuit for an LED has a connection for a mains voltage, a filter circuit and a rectifier, an inductance and a switch.
  • the inductor is magnetized when the switch is closed, and the inductor is demagnetized when the switch is open, and at least during the demagnetization phase, the current through the inductor feeds the LED.
  • the solution according to the invention relates to a device comprising a driver circuit for at least one LED, comprising a connection for a mains voltage, a rectifier and a filter circuit, a latching element, an inductance and at least one switch, wherein the inductance is up-demagnetized by high-frequency clocking of the switch and the inductor feeds the LED, the switch is driven by a control circuit, the control circuit being coupled to a sensor device and the sensor device enabling non-contact control of the brightness and color of the driver circuit.
  • the solution according to the invention also relates to a method for controlling at least one LED, wherein the at least one LED is driven via a driver circuit, wherein sensorless contactless control of the brightness and the color of the LED is made possible by means of appropriate control via the driver circuit.
  • the non-contact control can be done by an evaluation of a capacitive coupling, and depending on the capacitive coupling, the brightness and the color of the LED can be adjustable.
  • the solution according to the invention also relates to a luminous means for an LED, with a base for the use of the luminous means in a commercial lamp base, comprising a device according to the invention.
  • the invention is based on a first embodiment according to Fig. 1 explained with a driver circuit for an LED.
  • the driver circuit for an LED has a connection for a mains voltage, a filter circuit and a rectifier, an inductance and a switch.
  • the inductor is magnetized when the switch is closed, and the inductor is demagnetized when the switch is open, and at least during the demagnetization phase, the current through the inductor feeds the LED.
  • the switch S1 is preferably opened only when the current through the switch S1 has reached a predetermined threshold.
  • the current through the switch S1 can be detected by means of a current detection Ip (for example, a current shunt).
  • the turn-off duration of the switch S1 may be dependent on the detected amplitude of the current through the LED.
  • the switch-off duration of the switch S1 can be dependent on the degaussing current.
  • the inductance L2 can feed a smoothing circuit C2 during its demagnetization.
  • the inductance L2 may have a secondary winding.
  • the clocked inductor L2 of the driver circuit has a secondary winding L2s which is magnetically coupled to the primary winding L2p of the inductor L2.
  • the driver circuit can be designed as isolated flyback converter.
  • the driver circuit can also be designed as a resonant and isolated half-bridge converter having two controllable switch.
  • a driver circuit for an LED comprising a connection for a mains voltage, a rectifier GR1 and a filter circuit L1, a latching element, an inductance L2 and at least one switch S1, wherein the inductance L2 is up-demagnetized by high-frequency clocking of the switch S1 and the inductor L2 feeds the LED, and the switch S1 is driven by a control circuit U1.
  • the control circuit U1 is coupled to a sensor device SV, and the sensor device SV allows a non-contact control of the brightness and / or the color by means of the driver circuit.
  • the contactless control of the sensor device SV is performed by an evaluation of a capacitive coupling.
  • the brightness of the driver circuit can be adjustable by changing the control signal of the switch S1 by the control circuit.
  • the capacitive coupling takes place by a hand movement, preferably in the vicinity of the driver circuit or the LED lamp.
  • the sensor device SV may have a first capacitance, which may change its charge due to a capacitive coupling (to change the brightness).
  • the sensor device SV evaluates the capacitive coupling based on a comparison measurement between the first capacitance and a reference capacitance.
  • the sensor device SV can output the capacitive coupling, which is dependent on the comparison measurement between the first capacitance and a reference capacitance, as an evaluation signal, which is evaluated by the control circuit U1.
  • control circuit (U1) can change the frequency and / or the duty cycle when the switch S1 is actuated.
  • the sensor device SV evaluates by means of the evaluation of the capacitive coupling a detected hand movement as a control signal.
  • the detected hand movement can be evaluated in terms of its duration, and this period can be evaluated as information for the desired change in the brightness of the LED.
  • the detected hand movement is evaluated with regard to its intensity of the hand movement, and this intensity is evaluated as information for the desired change in the brightness and / or color of the LED.
  • the change of color can also mean a change in the color temperature or the color location.
  • a light source for an LED can be constructed, with a base for the use of the light source in a commercially available lamp base, comprising a driver circuit and a sensor device SV according to the invention.
  • the non-contact control of the sensor device SV and thus the LED has the advantage that no contact of a control element such as a touch panel is necessary.
  • This has the advantage that, on the one hand, the user can directly control the LED illuminant without running the risk of having to touch a hot light source; moreover, external controls can be dispensed with by integrating the sensor device SV into the illuminant.
  • external controls can be dispensed with by integrating the sensor device SV into the illuminant.
  • Non-contact control can also be used to specify or change configuration settings.
  • the non-contact control can also be used for address assignment, in that the illuminant is then assigned an address in an addressing mode when a non-contact control is detected there.
  • the recorded configuration settings can be stored in a memory and thus permanently available for use.
  • certain scenes can be defined. For example, in a configuration mode, which is achieved by a certain predetermined hand movement, certain scenes can be defined, which can then be retrieved later by a corresponding hand movement. It can be done during the configuration, the setting of the scenes in several steps and thus by relatively complicated hand movements, while the subsequent scene call by a certain hand movement, but can be relatively simple and short, can take place.
  • a method for driving an LED is made possible, wherein the LED is driven by a driver circuit, wherein via a sensor device SV, a non-contact control of the brightness and / or the color is made possible by means of the drive via the driver circuit.
  • the non-contact control is performed by an evaluation of a capacitive coupling, and depending on the capacitive coupling, the brightness and / or the color by means of the driver circuit is adjustable.
  • the switch S1 can be driven, for example, by an integrated circuit for a power factor correction.
  • the monitoring circuit U1 may include a power factor correction control circuit.
  • the inductance L2 may be a transformer L2p, L2s, which serves as a potential-separating member.
  • the primary winding L2p of the transformer is connected in series with the switch S1.
  • the secondary winding L2s magnetically coupled to the primary winding L2p is connected to a rectifier D2 and a smoothing circuit C2 to which the LED can be connected.
  • the rectifier D2 at the secondary winding L2s of the transformer can be formed by a diode D2 or by a full-wave rectifier.
  • the driver circuit has a connection for a mains voltage, which is followed by a rectifier GR1 and a filter circuit L1 and a buffer element. This is followed by an inductance L2 and a switch S1.
  • the inductance L2 is magnetized when the switch S1 is closed, and the inductance L2 is demagnetized when the switch S1 is opened, and at least during the demagnetization phase, the current through the inductance L2 feeds the LED.
  • the driver circuit can be constructed as a boost converter circuit or as a flyback converter circuit.
  • the flyback converter circuit or the boost converter circuit is designed to be isolated, ie, the clocked inductance L2 of the driver circuit has a secondary winding L2s, which is magnetically coupled to the primary winding L2p of the inductance L2.
  • a current detector preferably a unidirectional decoupling element, is included between the rectifier GR1 and the latching element C1.
  • the decoupling element can be formed as a current detector by a diode D1.
  • a full-wave rectifier DV1 as decoupling element.
  • bypass circuit R40, Q4 which is deactivated when the current detector (for example the decoupler) passes a current.
  • a bypass circuit R40, Q4 is always activated when a current flows into the driver circuit for an LED.
  • a current in the driver circuit for an LED always flows when a current flows through the rectifier GR1 via the inductance L2 and the switch S1 or into the intermediate storage element.
  • the decoupling member thus acts as a current detector.
  • This voltage across the decoupling element can be monitored.
  • This monitoring can be done by a monitoring circuit U1.
  • This monitoring circuit U1 may be, for example, an integrated circuit.
  • the monitoring circuit U1 can activate or deactivate the bypass circuit R40, Q4 as a current detector depending on the monitoring of the decoupling element.
  • the monitoring circuit U1 can detect, for example, only the voltage before the decoupling element or the voltage difference across the decoupling element (preferably by a respective voltage measurement in front of and behind the decoupling element).
  • the monitoring circuit U1 can also control the switch S1.
  • the decoupling element as a current detector can be formed by a diode D1.
  • a diode D1 a full-wave rectifier DV1 as decoupling element.
  • the driver circuit may be connected to a commercially available dimmer, and the bypass circuit R40, Q4 may be activated during the phases in which the dimmer cuts off a portion of the phase to provide residual current through the bypass circuit R40, Q4 and the inductor L2 and the switch S1 to lead and thus burden the dimmer.
  • the buffer element can be replaced by a valley fill circuit ( Fig. 3 ) or else by a smoothing capacitor C1 ( Fig. 2 ) are formed.
  • the switch S1 can be switched on whenever a demagnetization of the inductance L2 is detected. However, a switch-on can always take place only when the inductance L2 is de-magnetized, and a certain period of time can also be between the time of demagnetization and the restarting.
  • the switch S1 can be driven, for example, by an integrated circuit for a power factor correction.
  • the monitoring circuit U1 may include a power factor correction control circuit.
  • the inductance L2 may be a transformer L2p, L2s, which serves as a potential-separating member.
  • the primary winding L2p of the transformer is connected in series with the switch S1.
  • the secondary winding L2s magnetically coupled to the primary winding L2p is connected to a rectifier D2 and a smoothing circuit C2 to which the LED can be connected.
  • the rectifier D2 at the secondary winding L2s of the transformer can be formed by a diode D2 or by a full-wave rectifier.
  • the on and / or off duration of the switch S1 may be dependent on the detected amplitude of the current through the LED. Preferably, however, the switch-on and / or switch-off duration of the switch S1 does not decrease to zero or close to zero. In a simple variant, for example, a limitation of the current through the LED can be done by limiting the duty cycle.
  • the inductance L2 can feed a smoothing circuit C2 during its demagnetization, this smoothing circuit C2 can be, for example, a capacitor C2 or an LC or CLC filter.
  • the bypass circuit R40, Q4 may be formed by a resistor R40 in series with a switch Q4.
  • the bypass circuit can also have a current source (constant current source) as a bridging circuit.
  • a current source constant current source
  • An example of a current source (constant current source) is in Fig. 4 shown. In Fig. 4 only a section of the device according to the invention is shown.
  • the current detector is formed here by current monitoring element R34.
  • the monitor circuit U1 formed by a transistor Q5 and a resistor R30 connected to an internal power supply Vcc
  • the bypass circuit is deactivated.
  • the current flow through the current monitoring element R34 is the current which flows via the rectifier GR1 into the inductance L2 and the switch S1 or the buffer element.
  • Fig. 4 is the monitoring circuit U1 discrete, but it can also as in the examples of Fig. 2 and 3 be designed as an integrated circuit.
  • an integrated circuit as a monitoring circuit U1 further functions such as the control of the switch S1 can be integrated with.
  • the bypass circuit is according to Fig. 4 formed by a current source (constant current source).
  • the current source (constant current source) is formed in detail by the transistors Q4 and Q6 and the resistors R40, R27 and R29.
  • the bypass circuit may be as in Fig. 4 represented via a full-wave rectifier D3 via the filter circuit L2 to the terminal for a mains voltage, parallel to the rectifier GR1 be connected.
  • the rectifier via which the bypass circuit R40, Q4 is connected to the connection for a mains voltage, can either be the same rectifier, via which a current flows into the inductance and the switch or the buffer element (ie the rectifier GR1, see FIG Fig. 2 and 3 ), or another rectifier D3 may be connected in parallel with this first rectifier GR1 (see Fig. 4 ) to be available.
  • a method for driving an LED wherein the LED is driven by a driver circuit, and wherein the driver circuit is fed from a terminal for a mains voltage via a filter circuit L1 and a rectifier GR1, and wherein the driver circuit comprises a latch element, an inductance L2 and a switch S1, and wherein a bypass circuit R40, Q4 provided at the output of the rectifier GR1 is deactivated when a current flows into the driver circuit via the rectifier GR1.
  • a light source for an LED can be constructed, with a base for the use of the light source in a commercial lamp base, comprising a device according to the invention.
  • FIG. 5 Another driving option for a driver circuit for an LED is shown.
  • the driver circuit may be connected to a commercially available dimmer, and the switch S1 may be closed during the phases in which the dimmer cuts off a portion of the phase to pass a residual current across the inductor and the switch S1 and thus load the dimmer ,
  • the switch S1 can be switched on whenever a demagnetization of the inductance is detected. However, it is always possible to switch on only when the inductance has been de-magnetized, and it may also take a certain amount of time between the time of demagnetization and restarting.
  • the inductance may be a transformer which serves as a potential-separating member.
  • the predetermined threshold may depend on the current amplitude of the supply voltage. In a simple variant, for example, if the supply voltage exceeds a certain value, an increase of the threshold value can take place.
  • the inductance can feed a smoothing circuit during its demagnetization, this smoothing circuit can be, for example, a capacitor or an LC or CLC filter.
  • the switch S1 may always remain closed in the case of a control via a dimmer, as long as the current through the switch S1 has not reached a predetermined threshold, in addition there may be an activatable bypass circuit which is activated only when via the current detector sufficient current flow is detected.
  • bypass circuit can be designed to produce little additional loss in its activation.
  • the device may also comprise a driving circuit for an LED, comprising a connection for a mains voltage, a rectifier GR1 and a filter circuit, a latching element C1, an inductance L2 and a switch S1, wherein high-frequency clocking of the switch S1, energy via the inductance to the Illuminant can be transmitted, and at the output of the rectifier GR1, a bypass circuit R40, Q4 may be present, which is activated when the light-emitting diode LED is not in operation. This may be the case, for example, when no mains voltage is applied.
  • the bridging circuit R40, Q4 can thus be designed so that it is only deactivated when an operation of the light source, so the LED is. In this way, a better compatibility with so-called Netzkeschaltern can be achieved.
  • the bypass circuit R40, Q4 can be deactivated only in the phases when a current flow through the current detector is detected.
  • a light source for an LED with a base for use of the light source in a commercial lamp base, comprising a device according to the invention.

Landscapes

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

Claims (12)

  1. Dispositif d'actionnement de LED, comprenant un circuit pilote pour au moins une LED, le dispositif d'actionnement de LED comprenant un dispositif de capteur (SV) auquel est couplé un circuit de commande (U1),
    le circuit pilote pour l'au moins une LED comprenant un connecteur pour une tension de réseau, un redresseur (GR1) et un circuit de filtrage (L1), un élément accumulateur intermédiaire, une inductance (L2) et au moins un commutateur (S1), le circuit pilote étant conçu de façon à ce que l'inductance (L2) soit magnétisée et démagnétisée par un cadencement à haute fréquence du commutateur (S1) et à ce que l'inductance (L2) alimente les LED,
    le circuit pilote comprenant le circuit de commande (U1) pour la commande de l'au moins un commutateur (S1),
    caractérisé en ce que
    le dispositif de capteur (SV) est conçu pour la mesure sans contact du mouvement d'une main par couplage capacitif,
    le circuit pilote est conçue pour effectuer une modification de la commande de l'au moins un commutateur (S1) en fonction d'une analyse du couplage capacitif, afin de modifier une luminosité et/ou une couleur des LED et
    le dispositif est conçu pour analyser le mouvement de main détecté en ce qui concerne une intensité du mouvement de la main et pour analyser du mouvement de la main en tant qu'information pour une modification souhaitée de la luminosité et/ou de la couleur des LED.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    le dispositif de capteur (SV) est conçu pour mesurer sans contact le mouvement de la main près du circuit pilote par le couplage capacitif.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que
    le dispositif de capteur (SV) comprend un premier condensateur dont la charge varie en fonction du couplage capacitif.
  4. Dispositif selon la revendication 3,
    caractérisé en ce que
    le dispositif de capteur (SV) est conçu pour analyser le couplage capacitif à l'aide d'une mesure comparative entre le premier condensateur et un condensateur de référence.
  5. Dispositif selon la revendication 4,
    caractérisé en ce que
    le dispositif de capteur (SV) est conçu pour envoyer au circuit de commande (U1), en fonction de la mesure comparative entre le premier condensateur et le condensateur de référence, un signal d'analyse pour l'analyse.
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    le circuit de commande (U1) modifie, en fonction du signal d'analyse surveillé du dispositif de capteur (SV), la fréquence et/ou le taux de charge lors de la commande de l'au moins un commutateur (S1).
  7. Dispositif selon l'une des revendications 1 à 6,
    caractérisé en ce que
    le dispositif est conçu pour analyser le mouvement de main mesuré en ce qui concerne leur durée et analyser la durée en tant qu'information pour une modification souhaitée de la luminosité et/ou de la couleur des LED.
  8. Dispositif selon l'une des revendications 1 à 7,
    caractérisé en ce que
    le dispositif est conçu pour modifier, en fonction du mouvement de main mesuré, aussi bien la luminosité que la couleur.
  9. Dispositif selon l'une des revendications 1 à 8,
    caractérisé en ce que
    le circuit pilote est conçu comme un convertisseur à découpage isolé.
  10. Dispositif selon l'une des revendications 1 à 8,
    caractérisé en ce que
    le circuit pilote est conçu comme un convertisseur demi-pont résonant et isolé.
  11. Moyen d'éclairage avec des LED, avec un socle pour l'insertion du moyen d'éclairage dans un socle de lampe conventionnel, comprenant un dispositif selon l'une des revendications précédentes.
  12. Procédé de commande d'au moins une LED, l'au moins une LED étant commandée par l'intermédiaire d'un circuit pilote,
    un dispositif de capteur (SV) mesurant sans contact un mouvement de main par l'analyse d'un couplage capacitif,
    caractérisé en ce que
    une luminosité et/ou une couleur des LED est modifiée en fonction de l'analyse du couplage capacitif au moyen du circuit pilote,
    le mouvement de main mesuré est analysé en ce qui concerne une intensité du mouvement de main et
    l'intensité du mouvement de main est analysée en tant qu'information pour une modification souhaitée de la luminosité et/ou de la couleur de l'au moins une LED.
EP10807425.3A 2009-12-07 2010-12-07 Circuit d'excitation pour une del Active EP2510750B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT19412009 2009-12-07
PCT/AT2010/000468 WO2011069176A1 (fr) 2009-12-07 2010-12-07 Circuit d'excitation pour une del

Publications (2)

Publication Number Publication Date
EP2510750A1 EP2510750A1 (fr) 2012-10-17
EP2510750B1 true EP2510750B1 (fr) 2017-10-04

Family

ID=43797939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10807425.3A Active EP2510750B1 (fr) 2009-12-07 2010-12-07 Circuit d'excitation pour une del

Country Status (3)

Country Link
EP (1) EP2510750B1 (fr)
DE (1) DE112010004692A5 (fr)
WO (1) WO2011069176A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005022963A1 (fr) * 2003-09-02 2005-03-10 Richard Brown Appareil d'eclairage a detecteur de proximite

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520954B1 (fr) * 1982-01-29 1985-11-29 Commissariat Energie Atomique Structure de clavier capacitif
DE10239449B4 (de) * 2002-02-06 2013-10-24 Ulrich Kuipers Verfahren und Vorrichtung zur Realisierung von LED-Leuchten mit Farb- und Helligkeitseinstellung und dem dazugehörigen Bedienelement
WO2007105151A1 (fr) * 2006-03-13 2007-09-20 Koninklijke Philips Electronics N.V. Dispositif de reglage permettant de regler la couleur de la lumiere emise par une source de lumiere
DE102006025597A1 (de) * 2006-06-01 2007-12-13 Schrödinger, Karl, Dr. Anordnung zur Ansteuerung von Leuchtdioden
EP1871144B1 (fr) * 2006-06-22 2010-05-05 Osram Gesellschaft mit Beschränkter Haftung Dispositif d'excitation de diodes électroluminescentes
US20080297487A1 (en) * 2007-01-03 2008-12-04 Apple Inc. Display integrated photodiode matrix

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005022963A1 (fr) * 2003-09-02 2005-03-10 Richard Brown Appareil d'eclairage a detecteur de proximite

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DE112010004692A5 (de) 2012-10-31
WO2011069176A1 (fr) 2011-06-16
EP2510750A1 (fr) 2012-10-17

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