EP4297532A1 - Bande lumineuse et procédé de mise en marche et hors tension d'une bande lumineuse - Google Patents

Bande lumineuse et procédé de mise en marche et hors tension d'une bande lumineuse Download PDF

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Publication number
EP4297532A1
EP4297532A1 EP23179402.5A EP23179402A EP4297532A1 EP 4297532 A1 EP4297532 A1 EP 4297532A1 EP 23179402 A EP23179402 A EP 23179402A EP 4297532 A1 EP4297532 A1 EP 4297532A1
Authority
EP
European Patent Office
Prior art keywords
led
voltage
line
light strip
switch
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.)
Pending
Application number
EP23179402.5A
Other languages
German (de)
English (en)
Inventor
Michael Sallaberger
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.)
Sanube GmbH
Original Assignee
Sanube 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 Sanube GmbH filed Critical Sanube GmbH
Publication of EP4297532A1 publication Critical patent/EP4297532A1/fr
Pending legal-status Critical Current

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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]
    • 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
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/21—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel

Definitions

  • the invention relates to a light strip with LEDs (Light Emitting Diodes) or LED groups, which are arranged along the longitudinal extent of the light strip, and a supply voltage line for operating the LEDS or LED groups with a supply voltage, according to the preamble of claim 1
  • the invention further relates to a method for switching on LEDs (Light Emitting Diodes) or LED groups of a light strip, which are operated after switching on with a supply voltage provided by a supply voltage line of the light strip, the LEDs or LED groups starting with a switch-on time be switched on individually one after the other starting from a first end of the light strip and remain switched on until the last LED or LED group at a second end of the light strip is switched on within a predetermined switch-on time, according to the preamble of claim 7.
  • LED light strips are used to illuminate vehicle components or interior spaces, especially the interior lighting of the cargo area of commercial vehicles. It is known that for a visually appealing effect, the LEDs or LED groups are not all switched on at the same time, starting with a switch-on time, but rather one after the other, starting from a first end of the light strip, until the last LED or LED group within a predetermined switch-on time is switched on at a second end of the light strip.
  • a processor-controlled switching on of a light strip is known, with the individual LEDs or LED groups being assigned microprocessors which control the respective switch-on time.
  • microprocessors which control the respective switch-on time.
  • Such designs require considerable programming effort and complex structural implementation.
  • light strips of different lengths require customized designs, which increases manufacturing costs.
  • the aim of the invention to realize light strips and methods for switching on LEDs or LED groups of such light strips in which the duty cycle, i.e. the period of time from a switch-on time and the lighting of the first LED or LED group of a light strip to the lighting up of the
  • the last LED or LED group of the light strip is independent of the length of the light strip.
  • the LEDs or LED groups must therefore be switched on more quickly one after the other than with a light strip with a comparatively shorter length.
  • Claim 1 relates to a light strip with LEDs (Light Emitting Diodes) or LED groups, which are arranged along the longitudinal extent of the light strip, and a supply voltage line for operating the LEDS or LED groups with a supply voltage, it being proposed according to the invention that For each LED or LED group, a circuit element connected to the supply voltage line is provided for comparing a voltage present at a first input and a voltage present at a second input of the circuit element, and the circuit element is designed for the LED or LED group assigned to it Depending on the difference between the voltages present at the first input and the second input of the respective circuit element, the supply voltage is applied, the first input of the circuit elements being connected to a reference line which can be acted upon by a direct voltage, which acts as a voltage divider for applying the first input of the circuit element Circuit elements each with different ones Reference voltages are carried out, and the second input of the circuit elements is connected to a switch-on line which can
  • the LEDs or LED groups are switched on using their own switch-on line and a reference line, whereby the switch-on line is subjected to a voltage that continuously increases during the switch-on period, and the reference line is designed as a voltage divider.
  • the design as a voltage divider ensures the length dependence of the switch-on effect, since the voltage drop for each resistance element of the voltage divider, for example an ohmic resistor, is smaller the more resistance elements are provided, i.e. the longer the light strip is.
  • the successive sequence of the reference voltage assigned to each LED or LED group therefore depends on the length of the light strip.
  • the switch-on voltage exceeds a reference voltage
  • the relevant LED or LED group is supplied with the supply voltage and is therefore switched on.
  • the reference voltage of that LED or LED group that is closest to ground is reached, since the lowest voltage of the voltage divider is present here.
  • This LED or LED group is the first to be switched on and thus defines the starting point of the light strip.
  • the switch-on voltage reaches the voltage values rising in the voltage divider, i.e. the reference voltage of successive LEDs or LED groups, and the relevant LEDs or LED groups are switched on, until finally the LED or LED group that is closest to the DC voltage source is switched on Reference line is located. In this way, an analog solution is realized that can be implemented easily and therefore cost-effectively.
  • the circuit element is preferably designed as a comparator, whose inverting, first input is connected to the reference line and whose non-inverting, second input is connected to the switch-on line, the comparator being designed to ground the LED or LED group assigned to it, if the voltage present at the second input falls below the voltage present at the first input, and to apply the supply voltage to the LED or LED group assigned to it if the voltage present at the second input exceeds the voltage present at the first input.
  • the design of the reference line as a voltage divider ensures that the switch-on effect is length-dependent, since the voltage drop for each resistance element of the voltage divider is smaller the more resistance elements are provided, i.e. the longer the light strip is.
  • the successive sequence of the reference voltage assigned to each LED or LED group is therefore dependent on the length of the light strip, with one end of the reference line being connected to a DC voltage source and the other end of the reference line being connected to ground. If the light strip has to be cut to size in the course of its use by cutting off the end facing away from the DC voltage source, the user would have to ensure that the reference line is connected to ground again.
  • cutting areas for cutting the light strip are provided between two resistance elements of the reference line designed as a voltage divider, with each LED or LED -Group is assigned a ground circuit which is designed to connect the reference line between a cutting area and the remaining LED or LED group closest to the cutting area to ground as soon as an LED or LED group connected to the supply voltage line of the LED or LED group closest to the cutting area is connected and the cutting area crossing input line severed is.
  • the specified cutting areas ensure that the reference line is grounded after cutting by cutting an input line for the ground circuit that crosses the cutting area.
  • the input line connects the ground circuit assigned to an LED or LED group on this side of a cutting area with the supply voltage line of the subsequent LED or LED group located beyond the cutting area.
  • the ground circuit comprises a first switching transistor and a second switching transistor, the first switching transistor being connected with its drain connection to the reference line of the remaining LED or LED group closest to the cutting area and to its source -Connection is connected to ground, and the gate connection of the first switching transistor is connected on the one hand to the supply voltage line of the remaining LED or LED group closest to the cutting area and on the other hand is connected to the drain connection of the second switching transistor, the gate connection of the second switching transistor is connected via the input line crossing the cutting area to the supply voltage line of the LED or LED group to be separated closest to the cutting area and the source connection of the second switching transistor is connected to ground.
  • the cutting area has not been severed, a voltage is present at the gate connection of the second switching transistor, which is provided by the supply voltage line of the LED or LED group lying beyond the cutting area.
  • the second switching transistor thus becomes conductive and connects the gate terminal of the first switching transistor to ground.
  • the first switching transistor is therefore blocking, so that the ground circuit for the reference line of the LED or LED group on this side of the cutting area is inactive.
  • the second switching transistor thus becomes blocking, so that the gate connection of the first switching transistor is no longer open Mass is pulled. Instead, a voltage is now present at the gate connection of the first switching transistor, which is provided by the supply voltage line of the LED or LED group located on this side of the cutting area.
  • the first switching transistor is therefore conductive, so that the reference line of the LED or LED group on this side of the cutting area is pulled to ground.
  • the ground circuit for the reference line of the LED or LED group on this side of the cutting area is therefore active.
  • the supply voltage of the LED or LED group located on this side of the cutting area activates the first switching transistor
  • the supply voltage of the LED or LED group located beyond the cutting area activates the second switching transistor, the second switching transistor blocking the first switching transistor in the conductive state, and when the second switching transistor is in the off state, the first switching transistor is closed. If the second switching transistor is thus conducting, the first switching transistor is blocking, and if the second switching transistor is blocking, the first switching transistor is conducting.
  • the first switching transistor and the second switching transistor are each designed as self-blocking N-channel FETs in order to be able to carry out the ground circuit in a more power-saving manner.
  • the light strip has to be interrupted, for example to take obstacles in the laying path into account.
  • the light strip is severed in the cut areas and the severed light strip section is continued elsewhere.
  • the two severed light strip sections are of course electrically contacted in order to transmit the electrical signal from the remaining light strip to the separated light strip, but the reference line at the now free end of the remaining light strip section must not be set to ground in order to achieve the desired switch-on behavior in the transition between the two light strip sections to maintain.
  • the ground circuit has a solder bridge that is conductive Connection of the solder bridge connects the gate connection of the second switching transistor to the supply voltage line of the remaining LED or LED group closest to the cutting area.
  • the light strip can be severed in one of the cutting areas and the separated light strip section can be continued elsewhere with electrical contact with the remaining light strip section, the soldering bridge having to be filled with solder, which subsequently deactivates the ground circuit.
  • a method for switching on LEDs (Light Emitting Diodes) or LED groups of a light strip which are operated after switching on with a supply voltage provided by a supply voltage line of the light strip, is proposed below, wherein the LEDs or LED groups Starting with a switch-on time, they can be switched on one after the other starting from a first end of the light strip and remain switched on until the last LED or LED group at a second end of the light strip is switched on within a predetermined switch-on time.
  • the LEDs or LED groups are switched on using a switch-on voltage provided by a switch-on line and which increases continuously during the switch-on period, which is compared with a reference voltage which increases successively for successive LEDs or LED groups depending on the length of the light strip is, whereby an LED or LED group is supplied with the supply voltage using a circuit element connected to the supply voltage line as soon as the switch-on voltage exceeds the reference voltage assigned to the respective LED or LED group.
  • the reference voltage assigned to an LED or LED group is preferably provided by a reference line designed as a voltage divider and supplied with a direct voltage.
  • the switch-on voltage which continuously increases during the switch-on period, is preferably a switch-on voltage that increases linearly from the value 0 at the switch-on time to a maximum value at the end of the switch-on period.
  • the method according to the invention can of course also be used to switch off the light strip.
  • a method for switching off LEDs or LED groups of a light strip, which are operated before switching off with a supply voltage provided by a supply voltage line of the light strip is therefore proposed, the LEDs or LED groups being switched off one after the other starting with a switch-off time be switched off starting at a first end of the light strip and remain switched off until the last LED or LED group at a second end of the light strip is switched off within a predetermined switch-off time.
  • the LEDs or LED groups are switched off using a switch-on voltage provided by a switch-on line and continuously decreasing during the switch-off period, which is compared with a reference voltage that increases successively for successive LEDs or LED groups depending on the length of the light strip is, whereby an LED or LED group is separated from the supply voltage using a circuit element connected to the supply voltage line as soon as the switch-on voltage falls below the reference voltage assigned to the respective LED or LED group.
  • the LEDs L ji or the LED groups G j are arranged along a longitudinal extension L of the light strip, which is in the Fig.
  • the light band can be designed as an arrangement of LEDs L ji following one another individually along the longitudinal extent L, or as a matrix-like arrangement of LEDs L ji following one another in groups along the longitudinal extent L, which results in a more planar light band.
  • the longitudinal extent L is defined by the course of a reference line R connected in parallel and a switch-on line E.
  • the reference line R is connected to a DC voltage source at one end and to ground GND at the other end. The direct voltage applied to the reference line R drops successively across the resistance elements W j depending on the number of resistance elements W j .
  • the reference line R is therefore designed as a voltage divider.
  • the switch-on line E is connected at one end to a voltage source with which the switch-on line E is supplied with a switch-on voltage that continuously increases during the switch-on period.
  • the continuously increasing switch-on voltage is preferably a switch-on voltage that increases linearly from the value 0 at the switch-on time to a maximum value at the end of the switch-on period. This maximum value is above the DC voltage present on the reference line R.
  • the circuit element S j is designed as a comparator, the inverting, first input 1 of which is each connected to the reference line R and whose non-inverting, second input 2 is each connected to the switch-on line E.
  • the comparator is designed in such a way that it connects the LED group Gj assigned to it to ground GND as long as the voltage of the switch-on line E present at the second input 2 is below the voltage of the reference line R present at the first input 1.
  • the LED group G j assigned to the respective circuit element S j is supplied with the supply voltage via the supply voltage line VCC and is thus switched on.
  • the reference line R is designed as a voltage divider, so that the DC voltage applied to the reference line R drops successively across the resistance elements W j depending on the number of resistance elements W j . Different voltages are therefore present at the first inputs 1 of the resistance elements W j . These voltage values define the reference voltages assigned to each LED group G j . Regarding the Fig. 1 is therefore at the first input 1 of the circuit element S 1 has the highest reference voltage, and at the first input 1 of the circuit element S M the lowest reference voltage.
  • a switch-on voltage that increases linearly from the value 0 at the switch-on time to a maximum value above the DC voltage value of the reference line R thus first reaches the lowest reference voltage assigned to the first input 1 of the circuit element S M , so that the LED group G M is switched on first.
  • the switch-on voltage of the switch-on line E reaches the successively increasing reference voltages of the subsequent circuit elements S j until the highest reference voltage assigned to the first input 1 of the circuit element S 1 is reached and exceeded, whereby the last LED group G 1 is switched on.
  • the design of the reference line R as a voltage divider ensures that the switch-on effect is length-dependent, since the voltage drop for each resistance element W j of the voltage divider is smaller the more resistance elements W j are provided, i.e. the longer the light strip is.
  • the successive sequence of the reference voltage assigned to each LED group G j is therefore dependent on the length of the light strip, one end of the reference line R being connected to a DC voltage source and the other end of the reference line R being connected to ground GND. If the light strip has to be cut in the course of its use by cutting off the end facing away from the DC voltage source, the user would have to ensure that the reference line R is connected to ground GND again. In order to save the user from this process and to ensure that the reference line R is always at ground GND even when the light strip is cut without any further action on the part of the user, the embodiment according to Fig. 2 suggested.
  • FIG. 2 A sequence of three LED groups G j-1 , G j , G j+1 is shown, which represents a section of the light strip.
  • the LED groups G j with the circuit elements S j assigned to them and their connection to the reference line R, the switch-on line E and the Supply voltage line VCC are analogous to the embodiment according to Fig. 1 executed.
  • intersection areas B j are each located between the resistance element W j of an LED group G j and the electrical contact of the switching element S j+1 of the subsequent LED group G j+1 .
  • the cut takes place in the cutting area B j , i.e. in relation to the Fig. 2 between the LED group G j and the subsequent LED group G j+1 .
  • the LED group G j is subsequently also referred to as this side LED group G j or as the remaining LED group G j , and the subsequent LED group G j + 1 as the other side or as a separated LED group G j +1 .
  • the ground circuit M j has the task of connecting the reference line R between the cutting area B j and the resistance element W j of the LED group G j with ground GND as soon as one is connected to the supply voltage line VCC of the subsequent LED group G j+1 and the Cutting area B j crossing input line EL j of the ground circuit M j is severed.
  • the input line EL j connects the ground circuit M j assigned to an LED group G j on this side of the cutting area B j on a light strip section on this side with the supply voltage line VCC of the LED group G j+1 lying beyond the cutting area B j on a light strip section on the other side.
  • a possible version for the ground circuit M j is in the Fig. 2 shown and consists approximately in that the ground circuit M j comprises a first switching transistor T1 and a second switching transistor T2, each of which is designed as a normally off N-channel FET.
  • the first switching transistor T1 has its drain connection connected to the reference line R of the LED group G j via a first resistor R1 and its source connection is connected to ground GND.
  • the gate connection of the The first switching transistor T1 is connected on the one hand via a second resistor R2 to the supply voltage line VCC of the LED group G j lying on this side of the cutting area B j and on the other hand to the drain connection of the second switching transistor T2.
  • the gate connection of the second switching transistor T2 is in turn connected via the input line EL j crossing the cutting area B j to the supply voltage line VCC of the LED group G j+1 following the cutting area B j , and the source connection of the second switching transistor T2 is with Ground GND connected.
  • the gate connection of the second switching transistor T2 is further connected via a third resistor R3 to the ground GND present at its source connection, which is designed as a pull-down resistor and reliably opens the gate connection of the second switching transistor T2 when the input line EL j is cut Ground GND pulls to reliably block the second switching transistor T2.
  • the cutting area B j has not been severed, a voltage is present at the gate connection of the second switching transistor T2, which is provided by the supply voltage line VCC of the LED group G j+1 lying beyond the cutting area B j .
  • the second switching transistor T2 thus becomes conductive and connects the gate connection of the first switching transistor T1 to the ground GND connected to the source connection of the second switching transistor T2.
  • the first switching transistor T1 is therefore blocking, so that the ground circuit M j for the reference line R of the LED group G j lying on this side of the cutting area B j is inactive.
  • the first switching transistor T1 is therefore conductive, so that the reference line R of the LED group G j lying on this side of the cutting area B j is connected to the ground GND of the source connection of the first switching transistor T1.
  • the ground circuit M j for the reference line R of the LED group G j lying on this side of the cutting area B j is therefore active and connects the reference line R to the ground GND of the source connection of the first switching transistor T1.
  • the light strip has to be interrupted, for example to take obstacles in the laying path into account.
  • the light strip is severed in a cutting area B j and the separated light strip section is continued elsewhere.
  • the two severed light strip sections are of course electrically contacted in order to transmit the electrical signal from the remaining light strip to the separated light strip, but the reference line R at the now free end of the remaining light strip section must not be set to ground GND in order to achieve the desired switch-on behavior in the transition between the both light strip sections.
  • the ground circuit M j has a solder bridge LB j , which, when the solder bridge LB j is conductively connected, connects the gate connection of the second switching transistor T2 to the supply voltage line VCC of the remaining LED group G j .
  • the light strip can be severed in the cutting area B j and the separated light strip section can be continued elsewhere with electrical contact with the remaining light strip section, the soldering bridge LB j being filled with solder, which subsequently deactivates the ground circuit M j .
  • the embodiment according to the invention ensures that with a longer light strip, the LED groups G j are switched on more quickly one after the other than with a light strip with a comparatively shorter length.
  • the switch-on duration i.e. the time between the switch-on time and the lighting up the last LED group G j , can be freely selected using the selected switch-on voltage curve.
  • light strips are realized in which the time span from a switch-on time and the lighting of the first LED group to the lighting of the last LED group is independent of the length of the light strip.
  • the method according to the invention can of course also be used to switch off the light strip.
  • the LED groups G j are switched off one after the other starting at a switch-off time from a first end of the light strip until the last LED group G j at a second end of the light strip is switched off within a predetermined switch-off time.
  • the LED groups G j are switched off using a switch-on voltage provided by the switch-on line E and continuously decreasing during the switch-off period, which is compared with the reference voltage which increases successively for successive LED groups G j depending on the length of the light strip, where an LED group G j is separated from the supply voltage line VCC using the circuit element S j as soon as the switch-on voltage falls below the reference voltage assigned to the respective LED group G j .
  • the relevant LED group G j is separated from the supply voltage line VCC and thus switched off.
  • the reference voltage of that LED group G 1 that is closest to the voltage source of the switch-on line E is initially undershot, since the highest voltage of the voltage divider is present here.
  • This LED group G j is therefore the first to be switched off.
  • the switch-on voltage falls below the voltage values descending in the voltage divider, i.e. the reference voltages of successive LED groups G j , and the relevant LED groups G j are switched off, until finally the LED group G M that is closest to ground GND is switched off the reference line R is located.

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EP23179402.5A 2022-06-23 2023-06-15 Bande lumineuse et procédé de mise en marche et hors tension d'une bande lumineuse Pending EP4297532A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT504492022 2022-06-23

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EP4297532A1 true EP4297532A1 (fr) 2023-12-27

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141361A1 (de) * 1971-08-18 1973-02-22 Metrawatt Gmbh Leuchtband-messwertanzeige
DE2442876A1 (de) * 1974-09-07 1976-03-18 Preh Elektro Feinmechanik Schaltungsanordnung fuer eine leuchtanzeigeskala
WO2013107729A1 (fr) * 2012-01-16 2013-07-25 Osram Gmbh Module d'éclairage
WO2016085124A1 (fr) * 2014-11-28 2016-06-02 류태하 Système d'éclairage à led ca exempt de scintillement
US10487995B2 (en) * 2017-07-28 2019-11-26 Lumileds Llc Cuttable LED strip
EP3715702A1 (fr) * 2019-03-28 2020-09-30 Stepan Engineering GmbH Bandes à del à tension constante (selv)

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141361A1 (de) * 1971-08-18 1973-02-22 Metrawatt Gmbh Leuchtband-messwertanzeige
DE2442876A1 (de) * 1974-09-07 1976-03-18 Preh Elektro Feinmechanik Schaltungsanordnung fuer eine leuchtanzeigeskala
WO2013107729A1 (fr) * 2012-01-16 2013-07-25 Osram Gmbh Module d'éclairage
WO2016085124A1 (fr) * 2014-11-28 2016-06-02 류태하 Système d'éclairage à led ca exempt de scintillement
US10487995B2 (en) * 2017-07-28 2019-11-26 Lumileds Llc Cuttable LED strip
EP3715702A1 (fr) * 2019-03-28 2020-09-30 Stepan Engineering GmbH Bandes à del à tension constante (selv)

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