EP3554196A1 - Module à del à température surveillée - Google Patents

Module à del à température surveillée Download PDF

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Publication number
EP3554196A1
EP3554196A1 EP19167931.5A EP19167931A EP3554196A1 EP 3554196 A1 EP3554196 A1 EP 3554196A1 EP 19167931 A EP19167931 A EP 19167931A EP 3554196 A1 EP3554196 A1 EP 3554196A1
Authority
EP
European Patent Office
Prior art keywords
leds
led module
led
bridged
electronic ballast
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.)
Granted
Application number
EP19167931.5A
Other languages
German (de)
English (en)
Other versions
EP3554196B1 (fr
Inventor
Christoph Hofinger
Robert Strübl
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.)
Siteco GmbH
Original Assignee
Siteco Beleuchtungstechnik 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
Application filed by Siteco Beleuchtungstechnik GmbH filed Critical Siteco Beleuchtungstechnik GmbH
Publication of EP3554196A1 publication Critical patent/EP3554196A1/fr
Application granted granted Critical
Publication of EP3554196B1 publication Critical patent/EP3554196B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs

Definitions

  • the present invention relates to an LED module, which is supplied with power by a separate electronic ballast and in particular has a temperature monitoring.
  • the temperature monitoring of LED modules is achieved in various ways.
  • the temperature monitoring can be done by the electronic ballast, short electronic ballast.
  • This requires a connection between the ECG and a temperature sensor in the LED module.
  • the ECG evaluates the signal from the temperature sensor, which is usually transmitted as an analog voltage, in order to infer the possible overheating of the LED module and possibly reduce the supply current.
  • the evaluation of the analog signal is localized because the monitoring becomes inaccurate with increasing line length. In contrast, a digital signal would be relatively expensive.
  • the LED module is separated from the electronic ballast by means of a bimetallic switch.
  • this solution has the disadvantage that in case of overheating the entire LED module is turned off. Therefore, monitoring from the TOE is preferred in the art. However, this leads to problems with longer line connections.
  • Object of the present invention is to provide an LED module for power supply with a separate ECG, which allows temperature monitoring in the simplest possible way.
  • the object is achieved by an LED module according to claim 1 and by an LED module in conjunction with an electronic ballast according to claim 10.
  • a particularity of the LED module of the present invention is that the thermal switch bridges only a portion of the LEDs in the one or more rows of LEDs in the LED module to short only that portion of LEDs when a predetermined temperature is exceeded. If, when the predetermined temperature is exceeded, only a portion of the LEDs is switched off by short-circuiting, this is generally sufficient to reduce the operating temperature of the LED module to such an extent that thermal failure can be prevented. On the other hand, there is an advantage in that the LED module is not completely disconnected from the supply current. Even when the thermal switch is activated, light is still generated by the remaining part of LEDs, so that at least one emergency lighting is still present.
  • At least two LED groups are bridged, each with a thermal switch, each group comprising at least one LED.
  • the thermal switches may have different predetermined temperatures at which they short-circuit the respectively bridged LED group. This allows different staggered temperatures to be defined for shutting off the groups of LEDs.
  • a first temperature threshold is exceeded, a smaller group of LEDs can be switched off, so that the deactivation of some LEDs does not occur in the overall illumination intensity.
  • a second higher temperature threshold is exceeded, a larger group of LEDs is additionally short-circuited to avoid damage.
  • the invention remains in this Condition still a part of the LEDs left, which are still supplied with power, so that at least one emergency lighting is maintained. It can also be bridged more than just two groups of LEDs, each with a thermal switch.
  • the at least two LED groups comprise only LEDs from the same row. Since the current through the LED row remains constant due to the supply of the electronic ballast, when the LEDs are short-circuited in one or both groups, the remaining LEDs are supplied with the same supply current as before. This prevents the non-shorted LEDs from receiving a higher supply voltage to avoid overheating these LEDs.
  • a bridged with a thermal switch LED group which has one or more LEDs, surrounded on all sides by a plurality of LEDs in a planar arrangement.
  • the surrounding LEDs may be LEDs that are not bridged by another thermal switch, or may be LEDs that are bridged with another thermal switch, which preferably triggers at a higher temperature than the first thermal switch.
  • the advantage is that initially the centrally located LEDs are turned off, so that no heat test within the areal arrangement of the LEDs arises.
  • the plurality of LEDs which surround the LED group bridged by a thermal switch on all sides, connected in series with the bridged LED (s) of the LED group in the same row. This avoids that when shorting a group of LEDs, the remaining LEDs are supplied with a higher voltage because the ECG keeps the current constant through the row of all LEDs.
  • At least some of the several LEDs surrounding the LED group bridged on all sides by the thermal switch are not themselves bridged in a thermal switch. Since these LEDs have a larger average distance from each other due to the arrangement around the circumference of the bridged LED group, the risk of overheating of these LEDs when the LED group is switched off is low.
  • the invention in another aspect, includes an LED module as previously described and an ECG connected to the LED module to provide it with a constant current.
  • the ECG is arranged separately from the LED module. It can be arranged in the same luminaire, for example a same luminaire housing. It may also be spaced from the LED module by at least one meter. Since the thermal monitoring of the LED module takes place in the LED module itself, the proper operation of the LED module is ensured even with a larger cable length between the ECG and the LED module. Since the electronic ballast provides a constant current, the voltage drop across the line resistance of the supply lines for the electronic ballast is also compensated. The LED module is always supplied with the desired current to achieve the desired illuminance. The constant current can for To achieve a desired dimming to a predetermined value in the ECG be set.
  • FIG. 1 is a block diagram of an embodiment of the present invention is shown.
  • An ECG 2 is connected to an LED module, which in the embodiment according to FIG. 1 only a row of LEDs 4 has.
  • the LEDs are all connected in series in the series and connected to the ECG 2.
  • the electronic ballast supplies the LED module with a constant current I.
  • two LED groups 8 of two LEDs or of a single LED each with a thermal switch 6 are bridged.
  • the thermal switches 6 have a predetermined temperature at which they trip to short the bridged LEDs or the single bridged LED.
  • the thermal switch on a different trip temperature. For example, at a lower temperature initially only the single LED and only at a higher temperature, the group 8 of two LEDs 4 are shorted. Due to the short circuit, the LEDs 4 are no longer supplied with power, so that the operating temperature of the LED module is lowered when the temperature is exceeded. Since the entire series of LEDs are supplied with a constant current I through the ECG, the voltage drop in each non-shorted LED remains the same regardless of the number of shorted LEDs. The brightness of the individual LEDs is therefore always the same except for the shorted LEDs. Shorting the LEDs merely causes a few of the LEDs in the row to fail to meet thermal conditions. However, even if one or both predetermined triggering temperatures of the thermal switches are exceeded, at least four LEDs are still obtained in the embodiment which achieve the desired lighting task.
  • the LED module comprises a series of seven LEDs 4.
  • an LED group 8 of only a single LED with a thermal switch 2 is bridged.
  • the bridged LED is arranged in the middle of the unbridged LEDs.
  • the central LED is turned off. Since the middle LED is deliberately switched off, a better power distribution of the remaining LEDs under unfavorable ambient temperature can be achieved.
  • the heat test in the middle of the LED group is turned off, so that the power density is reduced. Turning off a LED on Edge would have less effect on the thermal load within the LED module.
  • the short-circuiting of the central LED is therefore advantageous in order to switch off the LED which is subject to the highest thermal stress in the planar arrangement of the LEDs.
  • FIG. 3 shows another embodiment similar to in FIG. 2 ,
  • five LED groups 8 are included, which are distributed in the same manner as the individual LEDs in the FIG. 1 , It is to be understood that each LED group 8 may consist of one or more LEDs.
  • the groups 8 are connected to each other in series (in the FIG. 3 not shown) and within each LED group, the LEDs are also connected in series.
  • a plurality of LED groups of different sizes can be provided, which are individually short-circuited at preferably different triggering temperatures by the thermal switch.
  • a plurality of parallel rows of LEDs wherein groups of a plurality of LEDs within the rows are preferably short-circuited with one thermal switch each.
  • thermal switch is preferably a bimetallic switch. This can be provided directly on a board on which the LEDs are arranged in the LED module.
  • electronic switches come into consideration, which make temperature measurements and means an electronic switch, in particular a semiconductor device, short-circuit the bridged LED group.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP19167931.5A 2018-04-10 2019-04-08 Module à del à température surveillée Active EP3554196B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018108412.9A DE102018108412A1 (de) 2018-04-10 2018-04-10 Temperaturüberwachtes led-modul

Publications (2)

Publication Number Publication Date
EP3554196A1 true EP3554196A1 (fr) 2019-10-16
EP3554196B1 EP3554196B1 (fr) 2020-12-02

Family

ID=66102558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19167931.5A Active EP3554196B1 (fr) 2018-04-10 2019-04-08 Module à del à température surveillée

Country Status (2)

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EP (1) EP3554196B1 (fr)
DE (1) DE102018108412A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4129005A1 (fr) * 2020-04-02 2023-02-08 Signify Holding B.V. Dispositif d'éclairage qui reçoit de la puissance d'une alimentation électrique externe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100134018A1 (en) * 2008-11-30 2010-06-03 Microsemi Corp. - Analog Mixed Signal Group Ltd. Led string driver with light intensity responsive to input voltage
US20110068696A1 (en) * 2009-09-24 2011-03-24 Van De Ven Antony P Solid state lighting apparatus with configurable shunts
WO2012166791A2 (fr) * 2011-06-03 2012-12-06 Cree, Inc. Dispositifs d'éclairage avec des groupes multi-couleurs compensés individuellement
EP2966941A1 (fr) * 2014-07-11 2016-01-13 Valeo Vision Système de pilotage de l'alimentation électrique et de gestion thermique de sources lumineuses

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19943345A1 (de) * 1999-09-10 2001-03-15 Hella Kg Hueck & Co LED-Leuchte
US7710050B2 (en) * 2005-11-17 2010-05-04 Magna International Inc Series connected power supply for semiconductor-based vehicle lighting systems
US8743921B2 (en) * 2007-12-17 2014-06-03 Koninklijke Philips N.V. Light emitting module and thermal protection method
DE102008031029B4 (de) * 2008-06-30 2012-10-31 Texas Instruments Deutschland Gmbh Elektronisches Bauelement mit einer Schutzschaltung für eine lichtemittierende Vorrichtung
DE102009060791A1 (de) * 2009-12-22 2011-06-30 Automotive Lighting Reutlingen GmbH, 72762 Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs sowie Beleuchtungseinrichtung eines Kraftfahrzeugs mit einem solchen Lichtmodul
DE102010002227A1 (de) * 2010-02-23 2011-08-25 Tridonic Ag Schutz von LEDs gegen Überhitzung und zu hohem Durchgangsstrom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100134018A1 (en) * 2008-11-30 2010-06-03 Microsemi Corp. - Analog Mixed Signal Group Ltd. Led string driver with light intensity responsive to input voltage
US20110068696A1 (en) * 2009-09-24 2011-03-24 Van De Ven Antony P Solid state lighting apparatus with configurable shunts
WO2012166791A2 (fr) * 2011-06-03 2012-12-06 Cree, Inc. Dispositifs d'éclairage avec des groupes multi-couleurs compensés individuellement
EP2966941A1 (fr) * 2014-07-11 2016-01-13 Valeo Vision Système de pilotage de l'alimentation électrique et de gestion thermique de sources lumineuses

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EP3554196B1 (fr) 2020-12-02
DE102018108412A1 (de) 2019-10-10

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