EP3666041B1 - System for operating an electronic light arrangement - Google Patents

System for operating an electronic light arrangement Download PDF

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Publication number
EP3666041B1
EP3666041B1 EP17755109.0A EP17755109A EP3666041B1 EP 3666041 B1 EP3666041 B1 EP 3666041B1 EP 17755109 A EP17755109 A EP 17755109A EP 3666041 B1 EP3666041 B1 EP 3666041B1
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EP
European Patent Office
Prior art keywords
buck
light
group
emitting diodes
voltage
Prior art date
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Active
Application number
EP17755109.0A
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German (de)
English (en)
French (fr)
Other versions
EP3666041A1 (en
Inventor
Michael Feldgen
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.)
Hella GmbH and Co KGaA
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Hella GmbH and Co KGaA
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Application filed by Hella GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Publication of EP3666041A1 publication Critical patent/EP3666041A1/en
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Publication of EP3666041B1 publication Critical patent/EP3666041B1/en
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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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]

Definitions

  • the present invention is related to a system for operating an electronic light arrangement.
  • Document EP 3 016 478 A1 discloses a generic system for operating an electronic light arrangement.
  • aforesaid object is achieved by a system for operating an electronic light arrangement, for example an arrangement with light-emitting devices, for instance LEDs or laser diodes or the like.
  • the system comprises:
  • the buck-boost-device is electrically connected to the at least one buck-device for providing a constant voltage (particularly for operating the buck-device and/or the light-emitting devices of the at least one secondary group) by using a voltage drop across the light-emitting devices of the primary group.
  • the constant voltage is provided by the voltage drop of the primary group, particularly equals the voltage drop.
  • the "constant current” and/or “constant voltage” refers to a nearly constant current or voltage respectively, which may vary within a certain range.
  • a current or voltage that varies within a certain tolerance for instance in a range from 0.01 A (Ampere) to 1 A, especially from 0.1 A to 0.2 A, or in a range from 0.1 V (Volt) to 2 V, especially from 0.5 V to 1 V, is regarded as "constant”.
  • the buck-boost-device can for example provide the first constant current, which causes the voltage drop across the light-emitting devices of the primary group.
  • the constant voltage for operating the at least one buck-device equals and/or depends on the voltage drop, which is supplied to the buck-device by the connection between the buck-boost-device and the buck-device(s).
  • This can be a direct or indirect electrical connection, so that for instance other electronic components can be integrated in a current path of this connection between the buck-boost-device and the buck-device.
  • the buck-boost-device is configured as DC-DC-buck-boost-converter for operating as constant current driver.
  • DC-DC refers to a DC-to-DC converter that converts a source of direct current (DC) from one voltage level to another.
  • the buck-boost converter can be a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude.
  • the buck-boost-device is configured as a buck (step-down) converter combined with a boost (step-up) converter, which refers to a certain topology of a buck-boost-converter (also referred to as "four-switch buck-boost converter").
  • the buck-boost-converter can operate over a wide input range from 4.5 V to 75 V, preferably from 9 V to 60 V, particularly preferably from 20 V to 30 V, and can for example have further functions like an overvoltage protection or thermal shutdown or the like. Therefore, the buck-boost-device can provide a stable and safe operation for the light arrangement.
  • the buck-boost-device is electrically connected to a supply input of the at least one buck-device for providing an intermediate circuit voltage to the at least one buck-device, wherein particularly the at least one buck-device is configured to step down the intermediate circuit voltage for providing a supply (operating) voltage for the at least one secondary group (that means the light-emitting devices of the secondary group), wherein particularly preferably the voltage drop depends on the first constant current and the type of light-emitting devices of the primary group, wherein for example the intermediate circuit voltage equals the voltage drop.
  • the assembly of light-emitting devices of the primary group can serve as a supplier for a very constant voltage for operating the at least one buck-device.
  • LEDs as light-emitting devices can provide a very constant voltage drop. Therefore, it is not necessary to use an additional regulation device for providing a constant supply voltage for the buck device(s), which can reduce costs and technical complexity.
  • an electrical primary potential is provided by the voltage drop (for instance a potential at the path through the light-emitting devices of the primary group), and the primary potential is electrically connected to a supply input of the at least one buck-device for providing a constant voltage for operating the at least one buck-device, wherein particularly the voltage drop is a voltage drop across a series connection of the light-emitting devices of the primary group. Therefore, it can be provided that the light-emitting devices of the primary and/or the secondary group(s) are connected in series such that the constant current provided by the buck-boost-device or the buck-device respectively is passed through a common current path of the light-emitting devices in series connection. This allows for a simple and cost-effective configuration of the arrangement.
  • a first buck-device is electrically connected to a first secondary group of the light arrangement for providing a constant current to the first secondary group
  • a second buck-device is electrically connected to a second secondary group of the light arrangement for providing a constant current to the second secondary group
  • both buck-devices are supplied by an intermediate circuit voltage provided by the buck-boost-device.
  • the at least one buck-device is configured as DC-DC-buck-converter for operating as constant current driver.
  • This can be a DC-to-DC power converter which steps down voltage (while stepping up current) from its input (supply) to its output.
  • the buck-device can have a lower complexity than the buck-boot-device. Therefore, costs and technical effort can be reduced when using (only) one buck-boost-converter and the voltage drop of the primary group for suppling downstream buck-devices with operation voltage.
  • the operation voltage of the buck-device(s) can be regulated by the light-emitting devices of the primary group.
  • at least one or at least two or at least three buck-devices can be provided, each connected to a corresponding secondary group. This allows for a highly flexible configuration of the light arrangement.
  • each of the secondary groups comprises a smaller number of light-emitting devices than the primary group, particularly preferably the second secondary group comprises a smaller number of light-emitting devices than the first secondary group.
  • each secondary group can have lower energy consumption than the primary group. This allows for using the voltage drop of the primary group as supply voltage for each of the buck-devices.
  • the secondary group particularly each of the secondary groups, comprises light-emitting devices configured to be operated with a current lower than the current for operating the light-emitting devices of the primary group. Particularly, this can be the case if different light intensities are used for the different groups.
  • the group with the highest energy consumption can serve as primary group for providing a supply (operation) voltage to the buck-devices of the secondary group(s).
  • the system is configured as a LED driver circuit for operating the light arrangement, wherein preferably the light arrangement is configured as a LED arrangement, particularly as a projection arrangement for projecting an image onto a surface, particularly preferably used for a vehicle.
  • the light arrangement is configured as a LED arrangement, particularly as a projection arrangement for projecting an image onto a surface, particularly preferably used for a vehicle.
  • the vehicle can be configured as a forklift truck or truck or passenger vehicle or the like.
  • the primary group as a first group of light-emitting devices requires a supply current (provided by the buck-boost-device) in a range from 500 mA to 1200 mA, preferably from 700 mA to 1000 mA, particularly preferably 820 mA.
  • the secondary group (or a first secondary group) as a second group of light-emitting devices requires a supply current (provided by the buck-device or a first buck-device) in a range from 200 mA to 800 mA, preferably from 300 mA to 600 mA, particularly preferably 480 mA.
  • a second secondary group as a third group of light-emitting devices requires a supply current (provided by a second buck-device) in a range from 100 mA to 600 mA, preferably from 200 mA to 400 mA, particularly preferably 360 mA.
  • the input voltage for the buck-boost-device is in a range from 9 V to 60 V, wherein the buck-boost-device is configured to step up and step down the input voltage. Therefore, the buck-boost-device can ensure that a constant supply voltage is provided for other buck-devices as well as serving as constant current driver for a set of light-emitting devices. This can have the effect that a highly efficient system for operating a light arrangement can be provided. Also, the buck-devices can work very efficiently since the input voltage provided by the voltage drop is very constant. Additionally, the operational safety can be enhanced since the number of necessary electrical components can be reduced.
  • a further assembly for operating a light arrangement 2 is shown. Particularly, this can be a known system or at least an assembly similar to a known system. It is shown that a main DC DC constant voltage stage 8 is used to provide a constant supply voltage PV.
  • the main DC DC constant voltage stage 8 is operated by an input voltage VCC.
  • the potential designations "VCC” and “PV” are used together with the respective ground potentials “GND DCDC” and “GND LED”. (Further ground potentials are “GND NTC” and “GND”).
  • the constant supply voltage (“PV” / "GND LED") is used for a main DC DC controller 9 and for two buck controllers 20a, 20b.
  • an inventive system 1 can reduce the number of electrical components, and particularly does not necessarily require the usage of an expensive and complex main DC DC constant voltage stage 8.
  • a buck-boost-device 10 is supplied by an input voltage ("VCC", “GNDDCDC”) and provides a constant current at the outputs ("LED+” and “VCC”).
  • an optional sensor pin is provided (“CNTC”), which can be connected to at least one of the groups, for instance the primary group 2a and the secondary group(s) 2b, 2c. Each group can comprise several light-emitting devices 30 that together form one light arrangement 2. It is also conceivable that the buck-boost-device 10 supports a temperature control function using the sensor pin CNTC.
  • the constant current output "LED+” is connected to the light-emitting devices 30 of the primary group 2a so that a voltage drop across the light-emitting devices 30 is effected (also shown in figure 3 ).
  • This voltage of the light-emitting devices 30 (or the primary group 2a respectively) can be used to supply a constant voltage for operating at least one buck-device 20.
  • This is achieved by connecting the buck-boost-device 10 with the at least one buck-device 20 (in particular the potential "LED+” and/or "VCC” is connected to each buck-device 20).
  • two buck-devices 20 exist, a first buck-device 20a and a second buck-device 20b.
  • the first buck-device 20a can be electrically connected to a first secondary group 2b by using potentials (or outputs) "LED2+” and “LED2-” and the second buck-device 20b can be connected to a second secondary group 2c by using potentials (or outputs) "LED3+” and “LED3-”.
  • the first buck-device 20a can provide a first secondary potential LED2+ and the second buck-device 20b can provide a second secondary potential LED3+.
  • the three groups of light-emitting devices 30 are exemplary shown.
  • the light-emitting devices 30 of each group can be in a series configuration so that the same current flows through the corresponding light-emitting devices 30.
  • the different groups can comprise a different number of light-emitting devices 30. This is made clear referring to figure 4 , which shows an example application of the system (1), not covered by the claimed invention.
  • a vehicle 5 that comprises the inventive system 1.
  • the light arrangement 2 is used to project an image 6 on the ground.
  • light points having a higher distance from the vehicle 5 require a projection with higher intensity than light points having lower distance. Therefore, each group can be operated with a different supply current.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP17755109.0A 2017-08-09 2017-08-09 System for operating an electronic light arrangement Active EP3666041B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/070159 WO2019029798A1 (en) 2017-08-09 2017-08-09 SYSTEM FOR OPERATING AN ELECTRONIC LIGHT ARRANGEMENT

Publications (2)

Publication Number Publication Date
EP3666041A1 EP3666041A1 (en) 2020-06-17
EP3666041B1 true EP3666041B1 (en) 2022-01-05

Family

ID=59683531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17755109.0A Active EP3666041B1 (en) 2017-08-09 2017-08-09 System for operating an electronic light arrangement

Country Status (3)

Country Link
EP (1) EP3666041B1 (zh)
CN (1) CN111034363B (zh)
WO (1) WO2019029798A1 (zh)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8558760B2 (en) * 2004-08-05 2013-10-15 Linear Technology Corporation Circuitry and methodology for driving multiple light emitting devices
US20070040516A1 (en) * 2005-08-15 2007-02-22 Liang Chen AC to DC power supply with PFC for lamp
US8598807B2 (en) * 2010-05-25 2013-12-03 Virginia Tech Intellectual Properties, Inc. Multi-channel constant current source and illumination source
CN103857127B (zh) * 2012-12-04 2018-01-09 通用电气公司 具有恒定电压外加恒定电流驱动电路的可调光led
US8884548B2 (en) * 2013-02-28 2014-11-11 Asahi Kasei Microdevices Corporation Power factor correction converter with current regulated output
JP6396431B2 (ja) * 2013-05-03 2018-09-26 フィリップス ライティング ホールディング ビー ヴィ Ｌｅｄ照明回路
RU2688205C2 (ru) * 2014-09-12 2019-05-21 Филипс Лайтинг Холдинг Б.В. Схема и способ диммирования сид
EP3016478B1 (en) * 2014-10-29 2018-10-03 Helvar Oy Ab Joint control of output power in a multichannel LED driver
KR102335464B1 (ko) * 2014-12-10 2021-12-07 주식회사 엘엑스세미콘 발광 다이오드 조명 장치의 제어 회로

Also Published As

Publication number Publication date
WO2019029798A1 (en) 2019-02-14
CN111034363B (zh) 2021-11-16
EP3666041A1 (en) 2020-06-17
CN111034363A (zh) 2020-04-17

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