EP2929756B1 - Appareil de commande d'un moyen d'éclairage et procédé correspondant - Google Patents
Appareil de commande d'un moyen d'éclairage et procédé correspondant Download PDFInfo
- Publication number
- EP2929756B1 EP2929756B1 EP13840118.7A EP13840118A EP2929756B1 EP 2929756 B1 EP2929756 B1 EP 2929756B1 EP 13840118 A EP13840118 A EP 13840118A EP 2929756 B1 EP2929756 B1 EP 2929756B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- operating device
- radio interference
- interference suppression
- switching means
- suppression element
- 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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Links
- 238000000034 method Methods 0.000 title claims description 18
- 230000001629 suppression Effects 0.000 claims description 59
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
Definitions
- the invention relates to operating devices for lighting means and methods for suppressing glowing of a lighting means.
- the invention relates in particular to operating devices and methods in which the operating device has a radio interference suppression element.
- Energy-saving lights can use light-emitting diodes (LEDs) as light sources. Such lamps can also be excited to glow by small currents. When using lights with light-emitting diodes as a light source, the effect can occur that the light is still lit when it is switched off. This effect can occur, for example, as so-called ghost light after the lamp has been switched off. In general, the lighting of the lamp when it is switched off is referred to here as glowing.
- One cause of such a glow can be, for example, line capacitances or a capacitive coupling within the operating device, but also other capacitive or inductive couplings. From the pamphlet US20070267984 a capacitance as a radio interference element between the primary side and the secondary side of an operating device is already known.
- the object of the invention is to provide an operating device for a lamp and a method with which the glow of a lamp can be effectively suppressed, i.e. reduced, when the lamp is in a switched-off state.
- An operating device for a lighting means comprises a radio interference suppression element and a device for suppressing glowing of the lighting means, which is coupled to the radio interference suppression element.
- the device for suppressing glowing which can reduce the glowing or completely eliminate it, is also referred to below as an anti-glowing device.
- the anti-glow device in the operating device can reduce glowing, which is caused, for example, by capacitances in the radio interference suppression element. Since the anti-glow device is provided in the operating device for the lighting means, the use of a separate unit for residual light suppression, which is connected, for example, between the operating device and the lighting means, is no longer necessary. Accordingly, the losses that can be caused by such a separate unit between the operating device and the lighting means can also be avoided.
- the embodiment according to the invention also allows dimming, for example by means of pulse width modulation.
- the anti-glow device can be set up to influence a current flow to or from the radio interference suppression element.
- the anti-glow device can be set up to influence the current flow to or from the radio interference suppression element as a function of the operating state.
- the anti-glow device can be set up to reduce a current flow between the radio interference suppression element and a ground when the operating device is in a standby mode and / or when the lamp is switched off.
- the anti-glow device can comprise a controllable switching means which is connected between the radio interference suppression element and a ground.
- the anti-glow device can be connected in series with the radio interference suppression element.
- the switching means can comprise a transistor, for example a field effect transistor (FET).
- the operating device can be set up in such a way that the controllable switching means is switched into an on-state and / or an off-state as a function of the operating state.
- the operating device can be set up in such a way that the controllable switching means between the radio interference suppression element and the ground is switched to an off state when the lamp is switched off and / or the operating device is in a standby mode.
- the operating device can be set up such that the controllable switching means between the radio interference suppression element and the ground is switched to an on state when the lamp is switched on.
- the controllable switching means can be coupled to a microcontroller, a controller or a processor or another integrated semiconductor circuit which is provided on a secondary side of the operating device.
- the controllable switching means can be connected in such a way that it is selectively switched to an on state by the microcontroller, the controller, the processor or the other integrated semiconductor circuit. This can ensure that the radio interference suppression element is switched off when the operating device is in a standby mode and the microcontroller on the secondary side is not supplied with energy.
- the controllable switching means can be switched to an on state by a voltage on a secondary side of the operating device.
- the operating device has a primary side and a secondary side.
- the radio interference suppression element is a radio interference suppression capacitor between the primary side and the secondary side.
- the anti-glow device can interrupt a circuit that is formed by the radio interference suppression capacitor.
- a circuit can arise in that leakage currents occur at the supply voltage frequency due to a coupling capacitance between an LED module and a grounded lamp housing.
- a corresponding circuit can be formed by the voltage between the phase conductor and ground on a primary side of the operating device, by the radio interference suppression capacitor and a coupling capacitance between the LED module and ground.
- the anti-glow device can be arranged on the secondary side of the operating device.
- the anti-glow device is between a radio interference suppression capacitor and a ground on the secondary side of the operating device.
- the operating device can be designed as an LED converter.
- the operating device can be designed as an isolated LED converter.
- a lighting system comprises an operating device according to an exemplary embodiment of the invention.
- the lighting system comprises a supply source connected to the operating device and a lighting means connected to the operating device.
- a method for suppressing glowing of a luminous means is specified.
- the lamp is coupled to an operating device that has a radio interference suppression element.
- the method includes influencing a current flow to or from the radio interference suppression element depending on an operating state of the operating device and / or depending on a signal frequency.
- a switching means on a secondary side of the operating device is controlled in order to suppress a current flow to and from the radio interference suppression element as a function of an operating state.
- the switching means is arranged between the radio interference suppression element and a ground.
- the radio interference suppression element can then be switched on selectively by the switching means when the lighting means is to be supplied with energy by the operating device.
- the radio interference suppression element can then be switched off selectively when the lamp is not to be supplied with energy.
- the method can be carried out with the operating device according to one exemplary embodiment.
- the operating device can be an LED converter.
- Fig. 1 illustrates a lighting system with an operating device for a lighting means according to an embodiment of the invention.
- the lighting system comprises a supply source 10, for example a mains voltage source, and a lamp 40 or a plurality of lamps 40.
- the lamp 40 has an operating device 50 according to an exemplary embodiment and a lamp 42.
- the lighting means 42 can comprise one or more light-emitting diodes (LEDs).
- the operating device 50 can accordingly be designed as an LED converter.
- the lighting means 42 can be implemented in various ways, for example by one or more inorganic LEDs, organic LEDs, other lighting means or a combination of the named types of lighting means.
- the operating device 50 is used to operate the respective lighting means 42 in a suitable manner.
- the operating device 50 can include, for example, a power supply unit which generates a suitable voltage and / or a suitable current for operating the lighting means 42 from a supply voltage supplied to the lamp 40.
- a housing of the lamp 40 can be grounded.
- the operating device 50 has a radio interference suppression element and an anti-glow device for suppressing glowing.
- the anti-glow device by conducting current to or from the radio interference suppression element depending on the operating state and / or frequency, glowing of the illuminant 42 can be reduced or completely eliminated when the lamp 40 is switched off and / or when the operating device 50 is in a standby mode. Mode is.
- the anti-glow device can comprise a switching means.
- the switching means can be provided in such a way that it is only switched selectively to an on state in order to connect a radio interference suppression capacitor when the lamp 40 is switched on.
- the switching means can be coupled to a secondary coil of a converter of the operating device.
- FIG. 3 is a block diagram representation of an operating device 50 according to an embodiment.
- the operating device 50 can operate as a constant current source or as a constant voltage source.
- the operating device 50 can be an LED converter.
- the operating device 50 can be an isolated LED converter.
- the operating device 50 has a rectifier 51 on the input side.
- the rectified supply voltage at the input of the operating device can be smoothed by a smoothing circuit 52 (also referred to as a power factor correction circuit or PFC circuit).
- the smoothing circuit 52 can perform a power factor correction in such a way that the total harmonic distortion (THD) is reduced and the power factor is increased.
- a DC-DC converter 53 can be of a Control device, for example a microcontroller, controller, processor or another integrated semiconductor circuit on a primary side of the operating device are controlled.
- the DC-DC converter can have an LLC resonant converter, a flyback converter, or another converter topology.
- the operating device can comprise a transformer with a primary-side coil 54 and a secondary-side coil 55 inductively coupled therewith.
- the primary-side coil 54 is arranged on a primary side 61 of the operating device 50.
- the secondary-side coil 55 is arranged on a secondary side 62 of the operating device 50.
- the transformer can produce galvanic isolation.
- the secondary side 62 can be a SELV (“safety extra-low voltage”) side of the operating device, which is separated from the primary side 61 by a SELV barrier 60 or other galvanic isolation.
- An output driver 56 can be coupled to the secondary-side coil 55. Outputs of the operating device 50 can be connected in an electrically conductive manner to the lighting means 42, for example to an LED module.
- the operating device 50 can, for example, also have only one DC-DC converter 53; the rectifiers 51, the smoothing circuit 52 and the output driver 56 are optional elements whose functions are also integrated in the DC-DC converter 53.
- the operating device 50 has a radio interference suppression element.
- the radio interference suppression element is designed as a radio interference suppression capacitor 59.
- the radio interference suppression capacitor 59 is connected between the primary side 61 and the secondary side 62.
- the radio interference suppression capacitor 59 can divert high-frequency interference signals from the mains and lamp lines, at least when the lamp 40 is switched on. This can reduce electromagnetic interference, for example.
- the high-frequency interference signals can be caused, for example, from the operation of one or more switching regulators, for example the direct current-direct current converter 53 or other components of the operating device 50.
- the operating device 50 has an anti-glow device 70.
- the anti-glow device 70 is coupled to the radio interference suppression element.
- the anti-glow device 70 can be set up to influence currents between the radio interference suppression element and a ground potential P0, for example to selectively block them. This can take place as a function of an operating state of the luminaire or the operating device. Alternatively or additionally, the current flow between the radio interference suppression element and a ground potential P0 can be blocked as a function of the frequency.
- the anti-glow device 70 can be designed in such a way that it flows in at least when the lamp 40 is switched off and / or the operating device 50 is in a standby mode a frequency of the supply voltage that is fed to the operating device, blocks or attenuates.
- the anti-glow device 70 can be configured such that at least when the lamp 40 is switched on, currents can flow at a radio interference suppression frequency between the radio interference suppression element 59 and the ground potential P0.
- FIG. 4 is a circuit diagram of an anti-glow device 70 in an operating device according to an exemplary embodiment.
- the anti-glow device 70 comprises a switching means 71.
- the switching means 71 can be arranged on the secondary side 62 of the operating device.
- the switching means 71 can comprise a transistor, for example an FET or another power switch.
- the switching means 71 can conductively connect the radio interference suppression capacitor 59 to a ground potential P0 when it is switched to an on state.
- the switching means 71 can be controlled such that a resistance of the switching means 71 is controlled as a function of an operating state. The resistance of the switching means 71 can then be selectively reduced when the lamp 40 is switched on and / or when the operating device 50 is not in a standby mode and provides energy to the lighting means. As a result, the radio interference capacitor 59 is switched on in order to divert interference signals against the ground potential P0. The resistance of the switching means 71 can be selectively increased when the lamp 40 is switched off and / or when the operating device 50 is in a standby mode. As a result, the switching means 71 can be switched to an off state. The radio interference capacitor 59 can be switched off in order to suppress a glowing of the lighting means.
- the switching means 71 can be provided in such a way that it is switched to the on state as a function of a voltage or a current at the output of the operating device.
- a gate of the switching means 71 can be coupled to an operating voltage of the secondary side 62.
- the switching means 71 can be provided in such a way that it is controlled by a microcontroller, a controller, a processor or another integrated semiconductor circuit.
- a gate of the switching means 71 can be coupled to a microcontroller which is arranged on the secondary side 62 of the operating device 50.
- the microcontroller can be coupled to the secondary-side coil 55 in order to be able to use it Energy to be supplied.
- the microcontroller controls the switching means 71 only in such a way that it is switched to an on state when the microcontroller on the secondary side is also supplied with energy. This can ensure that the radio interference suppression element is selectively switched off when the lamp is switched off and / or the operating device is in a standby mode.
- Fig. 4 shows a circuit arrangement of components of an operating device 50 according to an embodiment.
- a converter with a flyback converter topology is shown for the purpose of illustration. Other types of transducers can be used.
- a switching means 58 is actuated to store energy in the primary-side coil 54 (ie to charge the primary-side coil 54) or to transfer energy from the primary-side coil 54 to the secondary-side coil 55 (ie to discharge the primary-side coil 54) .
- the switching means 58 can be controlled by a microcontroller 69 on the primary side of the operating device 50. Instead of a microcontroller 69, a controller, a processor or another integrated semiconductor circuit can also be used.
- a charging capacitor 66 can be charged on the secondary side via a diode 65 which is connected to the secondary-side coil 55. Current can be output to the lighting means via output connections 67, 68 of the operating device 50.
- the microcontroller 69 can control the switching means 58 such that a constant current for supplying LEDs is generated from a rectified supply voltage at inputs 63, 64 of the converter.
- Another microcontroller 72 is provided on the secondary side of the operating device.
- the further microcontroller 72 can be supplied with energy from an operating voltage on the secondary side.
- the further microcontroller 72 can be set up to switch the switching means 71 from an off state to an on state when energy is provided for the lighting means via the output connections 67, 68.
- the further microcontroller 72 can be set up in such a way that the switching means 71 is switched to an off state when the lamp is switched off and / or the operating device is in a standby mode.
- the further microcontroller 72 is separate from the microcontroller 69 on the primary side and can carry out further control functions. Instead of the microcontroller 72, a controller, a processor or another integrated semiconductor circuit can also be used.
- Fig. 5 Figure 3 is a flow diagram of a method 90 according to an embodiment.
- the method 90 can be carried out automatically by the operating device 50 according to one exemplary embodiment.
- a glow of a light source can be suppressed as a function of an operating state.
- step 91 it is determined whether there is light output via LEDs. To do this, it can be determined whether the lamp is switched on. An operating voltage on a secondary side of the operating device can be monitored. Other criteria can be checked to determine whether the LEDs should be suppressed from glowing.
- a radio interference suppression element for example a radio interference suppression capacitor
- a radio interference suppression element can be switched off if glowing is to be suppressed.
- This can be achieved in that a line path between the radio interference suppression element and a ground potential is high-resistance, at least for signals at the supply voltage frequency.
- a switching means between the radio interference suppression element and the ground potential can be switched to an off state.
- the switching means can be designed in such a way that it automatically changes to a blocking state if no control signal is applied to a gate of the switching means.
- the switching means can be switched to the off state in that no control signal for controlling the switching means is output.
- the radio interference suppression element can be switched on if the glowing of the lighting means does not have to be suppressed, for example if the lamp is switched on.
- This can be achieved in that a conduction path between the radio interference suppression element and a ground potential has a low resistance at least for frequencies in a radio interference suppression area.
- a switching means between the radio interference suppression element and the ground potential can be switched to an on state.
- radio interference suppression element is designed as a capacitor
- other configurations and / or arrangements of the radio interference suppression element can also be used.
- Operating devices and methods according to exemplary embodiments can in particular be used for operating lights that include LEDs, without being restricted thereto.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Claims (7)
- Appareil de commande pour un moyen d'éclairage (42), comprenant :un transformateur pourvu d'une bobine (54) côté primaire, qui est agencée d'un côté primaire (61) de l'appareil de commande (50) et d'une bobine (55) côté secondaire couplée par induction à celle-ci, laquelle bobine est agencée d'un côté secondaire (62) de l'appareil de commande (50) etun élément antiparasite (59), l'élément antiparasite (59) étant un condensateur antiparasite entre le côté primaire (61) et le côté secondaire (62),caractérisé parun dispositif anti-décharge lumineuse (70, 71) couplé à l'élément antiparasite (59), le dispositif anti-décharge lumineuse (70, 71) comprenant un commutateur pouvant être commandé (71), qui est commuté entre l'élément antiparasite (59) et un potentiel de masse (P0) du côté secondaire (62),l'appareil de commande (50) étant conçu, dans un premier mode de l'appareil de commande (50), pour commuter le commutateur pouvant être commandé (71) dans un mode activé et donc pour raccorder de manière conductrice l'élément antiparasite (59) sélectivement au potentiel de masse (P0) du côté secondaire (62) et, dans un deuxième mode de l'appareil de commande (50), pour commuter le commutateur pouvant être commandé (71) dans un mode désactivé et donc pour séparer l'élément antiparasite (59) sélectivement du potentiel de masse (P0), pour supprimer une décharge lumineuse du moyen d'éclairage (42).
- Appareil de commande selon la revendication 1,
l'appareil de commande (50) présentant des moyens (72) pour commuter le commutateur pouvant être commandé (71) dans le mode activé en fonction du mode de commande. - Appareil de commande selon la revendication 2,
les moyens (72) étant conçus pour commuter le commutateur pouvant être commandé (71) en fonction d'une tension sur le côté secondaire (62) de l'appareil de commande (50). - Appareil de commande selon l'une quelconque des revendications précédentes,
le dispositif anti-décharge lumineuse (70, 71) étant agencé sur le côté secondaire (62) de l'appareil de commande (50). - Appareil de commande selon l'une quelconque des revendications précédentes,
l'appareil de commande (50) étant conçu comme un convertisseur à DEL. - Système d'éclairage comprenant
un appareil de commande (50) selon l'une quelconque des revendications 1 à 5,
une source d'alimentation (10) reliée à l'appareil de commande (50) et un moyen d'éclairage (42) relié à l'appareil de commande (50). - Procédé pour supprimer la décharge lumineuse d'un moyen d'éclairage (42), qui est couplé à un appareil de commande (50) selon l'une quelconque des revendications 1-5,
le procédé comprenant :la mise en marche du commutateur pouvant être commandé (71) dans le premier mode de l'appareil de commande (50) et le raccordement sélectif de l'élément antiparasite (59) au potentiel de masse (P0) du côté secondaire (62) de l'appareil de commande (50) etla mise à l'arrêt du commutateur pouvant être commandé (71) dans le deuxième mode de l'appareil de commande (50) et la séparation sélective de l'élément antiparasite (59) du potentiel de masse (P0) du côté secondaire (62) de l'appareil de commande (50) pour supprimer la décharge lumineuse du moyen d'éclairage (42).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATGM461/2012U AT13688U1 (de) | 2012-12-06 | 2012-12-06 | Betriebsgerät für Leuchtmittel |
DE102012023934.3A DE102012023934B4 (de) | 2012-12-06 | 2012-12-06 | Betriebsgerät und Verfahren zum Unterdrücken von Glimmen eines Leuchtmittels |
PCT/AT2013/000197 WO2014085837A2 (fr) | 2012-12-06 | 2013-12-06 | Appareil de commande d'un moyen d'éclairage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2929756A2 EP2929756A2 (fr) | 2015-10-14 |
EP2929756B1 true EP2929756B1 (fr) | 2021-02-03 |
Family
ID=50884087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13840118.7A Active EP2929756B1 (fr) | 2012-12-06 | 2013-12-06 | Appareil de commande d'un moyen d'éclairage et procédé correspondant |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150305112A1 (fr) |
EP (1) | EP2929756B1 (fr) |
CN (1) | CN104838725A (fr) |
WO (1) | WO2014085837A2 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014221502A1 (de) | 2014-10-23 | 2016-04-28 | Tridonic Gmbh & Co Kg | Betriebsgerät für LEDs |
EP3262901B1 (fr) * | 2015-02-26 | 2022-09-14 | Tridonic GmbH & Co. KG | Dispositif d'actionnement pour un élément d'éclairage |
JP6353992B1 (ja) * | 2015-06-04 | 2018-07-04 | フィリップス ライティング ホールディング ビー ヴィ | グロー低減が改善されたled光源 |
EP3549402A1 (fr) * | 2016-11-29 | 2019-10-09 | Signify Holding B.V. | Circuit de conversion entre un ballast fluorescent et une del. |
DE102018132656A1 (de) * | 2018-12-18 | 2020-06-18 | Tridonic Gmbh & Co Kg | Stromsensor und Messverfahren zur geschalteten Erfassung eines Wechselstroms |
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US20070267984A1 (en) * | 2006-05-22 | 2007-11-22 | Chris Peng | System and method for selectively dimming an LED |
US20080278229A1 (en) * | 2007-05-10 | 2008-11-13 | Andreas Grundl | Active Compensation Filter |
US20130134875A1 (en) * | 2010-06-28 | 2013-05-30 | Ningbo Huadian Envirotech Co., Ltd. | Light Regulatable Led Illumination Lamp |
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JPH10116692A (ja) * | 1996-10-11 | 1998-05-06 | Tozai Denko Kk | ショーケース用放電灯点灯装置 |
US6150771A (en) * | 1997-06-11 | 2000-11-21 | Precision Solar Controls Inc. | Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal |
CA2501447C (fr) * | 2004-03-18 | 2014-05-13 | Brasscorp Limited | Lampe de travail a del |
DE102006046729B4 (de) * | 2006-10-02 | 2008-12-11 | Infineon Technologies Ag | Stromversorgungsschaltung mit temperaturabhängigem Ausgangsstrom und Schaltungsanordnung mit einer Stromversorgungschaltung |
KR20100014890A (ko) * | 2007-02-13 | 2010-02-11 | 오스람 게젤샤프트 미트 베쉬랭크터 하프퉁 | 적어도 하나의 led를 동작시키기 위한 led 모듈 및 방법 |
CN102090143B (zh) * | 2008-07-07 | 2013-07-17 | 奥斯兰姆有限公司 | 用于驱动至少一个发光二极管的电路装置和方法 |
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DE102009051968B4 (de) * | 2009-11-04 | 2013-02-21 | Insta Elektro Gmbh | Verfahren zur Übertragung einer Steuerinformation von einem Steuergerät zu einer Lampeneinheit, ein dafür geeignetes Beleuchtungssystem, sowie Lampeneinheit |
CN201593708U (zh) * | 2010-01-28 | 2010-09-29 | 陈清尧 | Led照明灯 |
DE102010002081A1 (de) * | 2010-02-18 | 2011-08-18 | Tridonic Ag | LED-Spannungsmessung |
CN202032520U (zh) * | 2011-04-12 | 2011-11-09 | 上海土伦自动化控制技术有限公司 | 一种冰箱用led照明灯电路 |
PL2823691T3 (pl) * | 2012-03-09 | 2019-09-30 | Signify Holding B.V. | Źródło światła led |
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2013
- 2013-12-06 WO PCT/AT2013/000197 patent/WO2014085837A2/fr active Application Filing
- 2013-12-06 CN CN201380063501.8A patent/CN104838725A/zh active Pending
- 2013-12-06 US US14/647,424 patent/US20150305112A1/en not_active Abandoned
- 2013-12-06 EP EP13840118.7A patent/EP2929756B1/fr active Active
Patent Citations (4)
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US20030227278A1 (en) * | 2002-05-17 | 2003-12-11 | Harumi Sakuragi | Control circuit for charging and discharging, illuminating apparatus and driving method thereof |
US20070267984A1 (en) * | 2006-05-22 | 2007-11-22 | Chris Peng | System and method for selectively dimming an LED |
US20080278229A1 (en) * | 2007-05-10 | 2008-11-13 | Andreas Grundl | Active Compensation Filter |
US20130134875A1 (en) * | 2010-06-28 | 2013-05-30 | Ningbo Huadian Envirotech Co., Ltd. | Light Regulatable Led Illumination Lamp |
Also Published As
Publication number | Publication date |
---|---|
US20150305112A1 (en) | 2015-10-22 |
WO2014085837A2 (fr) | 2014-06-12 |
WO2014085837A3 (fr) | 2014-09-04 |
CN104838725A (zh) | 2015-08-12 |
EP2929756A2 (fr) | 2015-10-14 |
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