WO2019219366A1 - Configuration de circuit annulant une chute de tension inverse dans une diode électroluminescente (del) - Google Patents

Configuration de circuit annulant une chute de tension inverse dans une diode électroluminescente (del) Download PDF

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Publication number
WO2019219366A1
WO2019219366A1 PCT/EP2019/060956 EP2019060956W WO2019219366A1 WO 2019219366 A1 WO2019219366 A1 WO 2019219366A1 EP 2019060956 W EP2019060956 W EP 2019060956W WO 2019219366 A1 WO2019219366 A1 WO 2019219366A1
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WO
WIPO (PCT)
Prior art keywords
led
switching member
reverse voltage
driver circuit
leds
Prior art date
Application number
PCT/EP2019/060956
Other languages
English (en)
Inventor
Onder Sunetci
Musa OZDEMIR
Mucahit Bacaksiz
Hakan Ozkahraman
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to EP19720587.5A priority Critical patent/EP3794907A1/fr
Publication of WO2019219366A1 publication Critical patent/WO2019219366A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs

Definitions

  • the present invention relates to a reverse voltage protection circuit configuration protecting a light emitting diode (LED) against reverse voltage drops and thereby preventing it from malfunctioning.
  • LED light emitting diode
  • LEDs Semi-conductive structures such as LEDs are susceptible to damage due to application of reverse voltage and LEDs break down when power is applied thereon under certain circumstances. Therefore, reverse voltage protection which require special circuit designs is needed for LEDs.
  • LEDs are usually arranged in rows and columns and each LED can be addressed by specifying its row and column position. Due to the fact that micro-controllers have pins with maximum output current, transistors can be used as switching members to control a power supply for driving a plurality of LEDs simultaneously. Since LEDs may be subjected to reverse voltage when driven multiply, a circuit configuration is needed to prevent semi-conductive LED components from breaking down.
  • the present invention enables realizing a circuit configuration enabling, in connection with a switching member in the form of a transistor, a LED group to be protected against reverse voltage, and thereby canceling out a reverse voltage value which a LED in said LED group might be subjected to.
  • US2011017972 discloses a light emitting structure comprising a substrate having a first face, a second face, and a p-n junction formed between a p-type layer and an n-type layer, wherein the p-type layer and the n-type layer are used as a reverse voltage protection diode.
  • a buffer layer is provided on the substrate, and a light emitting diode (LED) is fabricated on the buffer layer. The LED is then electrically coupled to the reverse voltage protection diode so as to form an anti-parallel diode pair configuration.
  • LED light emitting diode
  • Reverse voltage protection can be provided for a LED by means of an anti-parallel diode, inhibiting application of reverse operating voltage to the LED.
  • Reverse voltage protection can be provided for a LED by means of an anti-parallel diode, inhibiting application of reverse operating voltage to the LED.
  • additional diode for each LED, they increase productions costs due to the employed additional diodes or transistors and are therefore not preferred. Additional costs pose a significant problem considering the number of additional members required, particularly when a large LED matrix is used.
  • the present invention enables realizing an electric circuit characterized by the features defined in claim 1, comprising a plurality of LEDs driven between on/off positions by a plurality of switching members controlled by a micro-controller, in which a switching member in off position is prevented from applying reverse voltage to a LED.
  • the aim of the present invention is to realize an electric circuit comprising a plurality of LEDs driven between on/off positions by a plurality of switching members, in which a switching member in off position is prevented from applying reverse voltage to a LED.
  • the LED driver circuit of the invention comprises a plurality of switching members each one of which energizes a plurality of LEDs.
  • Said switching members are preferably bipolar junction transistors (BJT) triggered by a control signal controlled by a micro-controller.
  • BJT bipolar junction transistors
  • reverse voltage is canceled out by means of a switching member used between the ground connection and a common node connecting the outlet of a plurality of LEDs.
  • the switching member used in the outlet end of the LEDs is controlled similar to the switching members energizing the LEDs.
  • the switching member disposed on the outlet end of the LED which is not energized and which is intended not to be applied reverse voltage thereon is controlled by the same signal with the switching member whose function is to energize the related LED.
  • Figure 1 is a simplified circuit diagram of a LED driver circuit in which the current flowing through a turned-on LED completes its path through a turned off LED.
  • Figure 2 is a simplified circuit diagram in which null reverse voltage is provided on the turned off LED of the LED driver circuit, in an embodiment of the invention.
  • the electrical circuit of the invention in the form of a LED driver circuit (1) comprises a plurality of LEDs (2, 3) driven between on/off positions by a plurality switching members (4, 5) controlled by a micro-controller, and prevents application of reverse voltage to a LED (2, 3) by said switching member (4, 5) in off position.
  • the electrical circuit of the invention comprises a power tap converting AC voltage to DC voltage and feeding a micro-controller (not shown in the figures) and other electrical circuit components.
  • the LED driver circuit (1) is connected to a digital outlet of the micro-controller.
  • a LED matrix can be arranged in rows and columns, and a given number of LEDs can thus be addressed by specifying a row and column position.
  • the LEDs are driven between on/off positions in a one-dimensional manner. A person skilled in the art would know that a LED can be driven according to relevant rows and columns.
  • the LED driver circuit (1) of the invention comprises at least one first switching member (4) and at least one second switching member (5) feeding at least one first LED (2) and at least one second LED (3) each of which is independently drivable.
  • Said switching members (4, 5) are preferably bipolar junction transistors (BJT) triggered by a control signal provided by the micro-controller.
  • the LED driver circuit (1) of the invention comprises tertiary switching members (7) provided between the ground connection and a common node (6) connecting the outlet ends of said at least two first or at least two second LEDs (2, 3).
  • the tertiary switching members (7) are used to prevent application of inverse voltage on a first or a second LED (2, 3) when it is turned off.
  • PNP BJTs are opted as the transistors, and their emitters are connected to a DC terminal and their bases are driven by a digital outlet.
  • a given number of LEDs (2, 3) are energized by the first switching member (4), the current passing through a turned on LED completes its path via a LED which is electrically directly, i.e. serially connected to the second switching member (5), and it this case, a reverse voltage drop may damage a LED (2, 3) connected to said second switching member (5) which is turned off at that moment.
  • a current which passes through a turned on LED and completes its path at a turned off LED is shown by dashed lines in Figure 1.
  • the tertiary switching member (7) connected to the common node (6) on the LED group (2, 3) which is not energized, is turned off, enabling the ends of the inactive LEDs (2, 3) to float.
  • an inverse voltage of null level is formed at a LED (2, 3) serially connected to a switching member (4, 5).
  • a LED (2, 3) connected to a switching member (4, 5) which is not online at that moment, is protected against inverse voltage by means of the circuit configuration of the invention.
  • the present invention enables realizing a LED driver circuit (1) comprising at least one first switching member (4), at least one second switching member (5) and tertiary switching members (7) electrically connected in series to at least one first and at least one second LED (2, 3) each of which is independently drivable.
  • the switching members (4, 5, 7) are preferably bipolar junction transistors (BJT) triggered by a control signal.
  • BJT bipolar junction transistors
  • the emitters of the bipolar injunction transistors are connected to a DC terminal and their bases are driven by a control signal.
  • a tertiary switching member (7) is controlled by the control signal of the switching member (4, 5) used in energizing the LED (2, 3) to which the tertiary switching member (7) is connected.
  • the LED (2, 3) intended to be turned on is energized by the DC terminal by means of the first or the second switching member (4, 5) and the circuit is completed by the tertiary switching member (7) controlled by the same control signal.
  • the floating position of the LED (2, 3) intended to be turned off, is maintained by jointly controlling and turning off the switching members (4, 5, 7) disposed on both of its ends.
  • a LED driver circuit (1) is realized by means of the present invention, providing LED reverse voltage protection, minimizing additional costs and not compromising functional efficiency compared to the alternative solutions.

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  • Led Devices (AREA)

Abstract

La présente invention concerne un circuit d'attaque de DEL (1) comprenant au moins un premier élément de commutation (4) et au moins un second élément de commutation (5) électriquement connectés en série à au moins une première et à au moins une seconde DEL (2, 3), chacune pouvant être commandée indépendamment. Des éléments de commutation tertiaires (7) sont agencés entre la connexion de masse et un nœud commun (6) reliant les extrémités de sortie desdites première et seconde DEL (2, 3).
PCT/EP2019/060956 2018-05-18 2019-04-29 Configuration de circuit annulant une chute de tension inverse dans une diode électroluminescente (del) WO2019219366A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19720587.5A EP3794907A1 (fr) 2018-05-18 2019-04-29 Configuration de circuit annulant une chute de tension inverse dans une diode électroluminescente (del)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRA2018/07052 2018-05-18
TR201807052 2018-05-18

Publications (1)

Publication Number Publication Date
WO2019219366A1 true WO2019219366A1 (fr) 2019-11-21

Family

ID=66334498

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/060956 WO2019219366A1 (fr) 2018-05-18 2019-04-29 Configuration de circuit annulant une chute de tension inverse dans une diode électroluminescente (del)

Country Status (2)

Country Link
EP (1) EP3794907A1 (fr)
WO (1) WO2019219366A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008050380A1 (fr) * 2006-10-23 2008-05-02 Pioneer Corporation Appareil de test de panneau d'affichage et procédé de test
US20110017972A1 (en) 2009-07-22 2011-01-27 Rfmd (Uk) Limited Light emitting structure with integral reverse voltage protection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008050380A1 (fr) * 2006-10-23 2008-05-02 Pioneer Corporation Appareil de test de panneau d'affichage et procédé de test
US20110017972A1 (en) 2009-07-22 2011-01-27 Rfmd (Uk) Limited Light emitting structure with integral reverse voltage protection

Also Published As

Publication number Publication date
EP3794907A1 (fr) 2021-03-24

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