EP2811812A2 - Schaltkreis und Stromversorgungsverfahren von Dioden, Beleuchtungsvorrichtung auf der Grundlage von Dioden, die einen solchen Schaltkreis umfasst - Google Patents

Schaltkreis und Stromversorgungsverfahren von Dioden, Beleuchtungsvorrichtung auf der Grundlage von Dioden, die einen solchen Schaltkreis umfasst Download PDF

Info

Publication number
EP2811812A2
EP2811812A2 EP14170518.6A EP14170518A EP2811812A2 EP 2811812 A2 EP2811812 A2 EP 2811812A2 EP 14170518 A EP14170518 A EP 14170518A EP 2811812 A2 EP2811812 A2 EP 2811812A2
Authority
EP
European Patent Office
Prior art keywords
circuit
diodes
series
short
diode
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.)
Withdrawn
Application number
EP14170518.6A
Other languages
English (en)
French (fr)
Other versions
EP2811812A3 (de
Inventor
Dumitru-Mircea Chiorean
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.)
Westline SARL
Original Assignee
Westline SARL
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 Westline SARL filed Critical Westline SARL
Publication of EP2811812A2 publication Critical patent/EP2811812A2/de
Publication of EP2811812A3 publication Critical patent/EP2811812A3/de
Withdrawn legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a circuit for powering a set of diodes. It also relates to a diode supply method and a lighting device comprising such a circuit.
  • the field of the invention is the field of supplying diodes, and more particularly light-emitting diodes, commonly called LEDs ("light emitting diodes" in English). More generally, the field of the invention is the field of lighting devices based on diodes, and more particularly on LEDs.
  • LED-based lighting devices have multiple advantages, mainly related to low energy consumption, lifetime, and so on. LEDs. In addition, the lighting obtained by a device based on LEDs is less aggressive because less emitter ultraviolet.
  • LED-based lighting devices have been developing strongly in recent years, regardless of the area concerned.
  • the power supplies are very often bulky and constitute a barrier to the design of lighting devices based on LEDs of reduced dimensions.
  • the power supplies have an additional cost, in the manufacture of LED-based lighting devices, reduce the overall efficiency of LED-based lighting devices, increase design complexity, reduce the life of LED-based lighting devices.
  • the invention aims to overcome the aforementioned drawbacks.
  • the object of the invention is to propose a power supply circuit for LEDs, and more generally for diodes, avoiding the use of a power supply unit when powering the sector, and more generally from a source of power. supply providing a non-constant power supply signal over time.
  • Another object of the invention is to propose a circuit for supplying LEDs, and more generally diodes, enabling the design of lighting devices based on LEDs that are simple to produce, less expensive, operating at a higher efficiency. high, more compact and more robust.
  • the circuit according to the invention therefore proposes to modulate the number of diodes supplied as a function of the fluctuations of the supply current.
  • the circuit according to the invention makes it possible to reduce respectively to increase, the number of diodes actually fed when the supply current decreases, respectively increases.
  • the circuit according to the invention makes it possible to keep substantially the same voltage at the terminals of powered diodes, or in any case to reduce the fluctuations of the current in the diodes actually fed.
  • the circuit according to the invention makes it possible to supply LEDs, particularly from the mains, without using a power supply unit.
  • the circuit according to the invention thus makes it possible to produce lighting devices based on diodes, and particularly LEDs, which are simpler, less expensive, more compact and more robust.
  • the circuit according to the invention provides a higher operating efficiency because it makes it possible to exploit the entire supply signal, and to avoid losses related to a power supply unit.
  • the circuit according to the invention makes it possible to produce lighting devices based on diodes which can be directly connected to the sector because the variations of the current will be absorbed by the circuit according to the invention, without the use of a block of diodes. 'food.
  • the circuit according to the invention also makes it possible to design lighting devices based on more robust LEDs, having a longer lifetime in phase with the lifetime of the LEDs.
  • circuit according to the invention operates with any voltage / power / supply current.
  • control module has an architecture easy to achieve, using inexpensive elements and small dimensions.
  • the invention makes it possible to achieve a finer modulation of the number of diodes actually supplied by the power supply signal, and therefore a finer regulation of the voltage across the diodes actually fed according to fluctuations in the supply current.
  • the use of a larger number of short-circuit means makes it possible to increase the number of series diodes that can be short-circuited or powered according to fluctuations in the supply current, and thus to cover a greater fluctuation of the supply current.
  • each short-circuit means may be provided to be associated with an identical number of diode (s) series (s), in particular two series diodes.
  • the series diodes are short-circuited and fed (or replenished) two by two.
  • This characteristic constitutes a very advantageous compromise taking into account on the one hand the manufacturing cost of the circuit in terms of means and manufacturing time, and on the other hand the precision of the regulation.
  • each short-circuit means may be associated with a single series diode. In this case, the control accuracy is greater.
  • each short-circuit means may be associated with at least three series diodes. In this case, the cost price of the circuit is lower.
  • At least two shorting means may each be associated with a different number of series diodes.
  • the accuracy of the regulation will be variable depending on the short circuit means involved.
  • the circuit may comprise a plurality of regulation modules, each regulation module being provided for regulating through a group of diodes connected in series and forming part of the set of diodes to be powered.
  • the circuit according to the invention comprises several regulation zones, and series diodes will be short-circuited and fed (or replenished) in several zones of the circuit, as a function of the variation of the supply signal.
  • At least one control module can be positioned at the beginning, respectively at the end circuit according to the invention, namely on the side of a larger, respectively smaller, supply potential.
  • the series diodes will be short-circuited and supplied at the upstream or downstream ends of the circuit according to the invention, thus allowing more discreet regulation for the user.
  • At least one, in particular each, short-circuit means may be a MOSFET transistor, intended to be connected to at least one series diode by the drain and the source.
  • the variation of the value of the voltage between the gate and the source of the MOSFET transistor will automatically realize either a short-circuit or a supply (or a feed) of the mounted series diode (s). between the drain and the source of the MOSFET transistor.
  • control means may be a bipolar transistor.
  • the variation of the voltage between the base and the emitter of the transistor will cause the automatic variation of the value of the current and the potential at the collector of the bipolar transistor, this variation being able to be used as a control signal of a transistor.
  • short circuit means such as, for example, a short-circuit means formed by a MOSFET transistor.
  • the circuit according to the invention may comprise a regulation module positioned at the end of the circuit, that is to say on the side of a lower supply potential.
  • the control module can include several short-circuit means and a single control module.
  • the control module may comprise a bipolar transistor mounted as a common emitter and whose base is connected / connected downstream of the last diode of the set of diodes, so that the voltage between the base of the bipolar transistor and the emitter of the Bipolar transistor is proportional to the current flowing through each of the diodes connected in series.
  • a resistor can be connected in series with the series diodes and between the base and the emitter of the bipolar transistor.
  • the voltage V BE between the base and the emitter of the bipolar transistor is directly proportional to the supply current flowing through the diodes.
  • the control current I C of the collector of the bipolar transistor also varies and is used to control the short-circuit means.
  • the current I C of the bipolar transistor controls the potential of the gate of each MOSFET transistor in turn and progressively.
  • each MOSFET transistor leaves the short-circuit operation and closes, and the diodes are between the drain and the source of this transistor are powered or recharged.
  • the circuit according to the invention can be in the form of an integrated circuit or in the form of a standard electronic card.
  • the circuit according to the invention may further comprise a constant current regulator arranged upstream of the set of diodes.
  • Such a constant current regulator may for example be a pre-biased transistor (“pre-biased transistor”) mounted in series with the set of diodes.
  • pre-biased transistor a pre-biased transistor mounted in series with the set of diodes.
  • Such a current regulator is particularly useful when the regulation capacity, provided and obtained by the regulation module, is exceeded.
  • the circuit according to the invention may further comprise a means of protection against high voltages.
  • the high voltage protection means may for example be a transil diode connected in parallel with the set of diodes.
  • the circuit according to the invention may further comprise a current rectifier module, providing the constant current power supply signal from an AC power source, such as the mains.
  • all the diodes of the set of diodes can be connected in series with each other.
  • the FIGURE 1 is a schematic representation of a first embodiment of a control module of a circuit according to the invention.
  • the regulation module 100 represented on the FIGURE 1 allows to regulate in the context of the power supply of a set 102 of LEDs, connected in series with each other, by a constant DC power supply signal.
  • the group 104 and the group 106 are also connected in series with each other.
  • the control module also comprises a control means 110 for controlling each of the short-circuit means 108 as a function of the variation of the supply signal flowing through the set of LEDs 102.
  • the control means 110 detects the variations of the supply signal, and more particularly of the supply current, by means of a resistive element 112, which may be a resistor whose value is chosen as a function of the current flowing through the diodes.
  • the control means 110 is arranged to control each of the short-circuit means 108 in turn and progressively as a function of the variation of the supply signal, and in particular of the supply current.
  • Control means 110 if the feed signal decreases by a predetermined value, this decrease is detected by means of control 110 through resistor 112.
  • Control means 110 then identifies the nearest short circuit means 108 and is in the off state. This is the short circuit means 108 n-1 .
  • the control means 108 n-1 is then commanded to go to the short-circuit state to short-circuit the LED 106 n-1 associated with it: the decrease in the power signal is then compensated for at the level of the other LEDs. of the set of LEDs 102 which then receive more power.
  • the closest short-circuit means which is in the off state i.e. the means 108 n-2 (not shown), is then controlled to to switch to the short-circuit state, and so on the rest of the short-circuit means in turn from the short-circuit means 108 n-4 to the short-circuit means 108 1 .
  • the control means 110 if the supply signal increases by a predetermined value, this increase is detected by the control means 110 via the resistor 112.
  • the control means 110 identifies the short-circuit means 108. the farthest and that is in the state short circuit. This is the short circuit means 108 2 .
  • the control means 108 2 is then controlled to go to the off state and allow the supply of the LED 106 2 associated with it, and the LED 106 2 is then powered: the increase of the power signal is then compensated at the other LEDs of the set of LEDs 102 which then receive less power.
  • the far short-circuit means which is in the short circuit condition that is to say the short-circuit means 108 3 (not shown)
  • the short-circuit means 108 3 is then commanded to go to the off state, and so to continued on the remainder of the short circuit means in turn from the short-circuit means 108 4 to the short-circuit means 108 n .
  • the regulation module dynamically regulates the voltage across each diode as a function of the variations in the current supplied, in particular by the sector.
  • the FIGURE 2 is a schematic representation of a second embodiment of the regulation module according to the invention.
  • the regulation module 200 represented on the FIGURE 2 includes all the elements of the regulation module 100 of the FIGURE 1 .
  • each short-circuit means 108 1 -108 n is associated with two regulating diodes 106.
  • each short-circuit means 108 i makes it possible to short-circuit or supply two regulating diodes serial.
  • control group 106 comprises twice as many LEDs compared to the case of the FIGURE 1 .
  • control module will include half as many short circuit means.
  • FIGURE 3 is a schematic representation of a preferred embodiment of a regulation module, according to the embodiment shown in FIG. FIGURE 2 .
  • the regulation module 300 represented on the FIGURE 3 comprises five short-circuit means which are MOSFET transistors 302 1 -302 5 .
  • Each MOSFET transistor 302 is associated with two regulation diodes connected in series between the drain and the source of the transistor 302.
  • MOSFET transistor 302 1 makes it possible to short-circuit or supply the diodes 106 1 and 106 2
  • the MOSFET transistor 302 2 makes it possible to short-circuit or supply the diodes 106 3 and 106 4 , and so on.
  • This regulation module 300 is as follows.
  • the voltage V BE When the supply current supplying the set 102 of LEDs decreases, the voltage V BE also decreases.
  • the voltage V BE of the bipolar transistor 304 then decreases the current I C of the collector of the bipolar transistor 304 decreases, and the potential V C of the collector of the bipolar transistor 304 increases.
  • the increase of the potential V C of the collector of the bipolar transistor 304 is accompanied by the increase of the potential V G of the gate of the closest MOSFET transistor, namely the MOSFET transistor 302 5 , and the voltage V GS between the gate and the source of the MOSFET 302 5 also increases.
  • this MOSFET transistor 302 5 opens and operates as if there was a short circuit between its drain and its source: this state corresponds to the state "short circuit" described above with reference to Figures 1 and 2 . Therefore, the control diodes 106 9 and 106 10 are shorted, and are no longer supplied.
  • the current I C of the bipolar transistor 304 comes to control the potential of the gate of each MOSFET transistor 302 in turn and progressively.
  • each MOSFET transistor 302 is short-circuited by the current I C , in turn, that is to say that the transistor opens, and until the power signal stop decreasing.
  • the MOSFET transistor 302 which is furthest from the bipolar transistor 304, and which is in a short-circuit or open state, the MOSFET transistors 302 are turned on (or off) by the current I C , that is to say in an operation in which there is no short circuit between the drain and the source, and until the supply current stops increasing.
  • This embodiment is particularly interesting because it enables automated regulation as a function of the variation of the supply signal, without software intelligence, without means of specific measurement of the current or the supply voltage, according to a very simplified architecture. involving standard and inexpensive components.
  • this embodiment can be implemented according to the embodiment of the FIGURE 1 , or whatever the number of control diodes associated with each short-circuit means.
  • the FIGURE 4 is a schematic representation of a first embodiment of a circuit according to the invention.
  • the circuit 400 represented on the FIGURE 4 includes the regulation module 300 of the FIGURE 3 .
  • the circuit 400 includes two ports 402, 404 for connection to an electrical source providing an AC power signal such as the mains.
  • the circuit 400 includes a resettable fuse 406.
  • the circuit 400 further comprises a pre-biased transistor 408 as constant current regulator, arranged upstream of the set 102 of diodes and in series with the set 102 of diodes.
  • the circuit 400 further comprises a current rectifier module 410, providing from the AC power signal a DC power signal.
  • This module is arranged in parallel with the set 102 of LEDs and upstream of the pre-polarization transistor 408.
  • circuit 400 comprises a transile 412.
  • This transil in conjunction with the resettable fuse 406, protects the circuit against very high voltages, such as voltages greater than or equal to 400V.
  • the circuit comprises a single regulation module operating with a single group of control LEDs, disposed at a downstream end of the set 102 of LEDs, relative to the port 402.
  • the FIGURE 5 is a schematic representation of a second embodiment of a circuit according to the invention.
  • the circuit 500 includes all the elements of the circuit 400 of the FIGURE 4 .
  • the circuit 500 comprises a second regulation module 502 operating with a second group 504 of control LEDs, positioned at an end downstream of the set 102 of LEDs relative to the port 402.
  • the circuit 500 comprises a regulation module and an LED control unit at each of the ends of the set of LEDs 102.
  • the regulation module 502 comprises a control module which is a bipolar transistor as for the regulation module 302.
  • the regulation module 502 also comprises four short-circuit means and each short-circuit means is a MOSFET transistor such as for the regulation module 302.
  • Each MOSFET transistor is associated with two regulating diodes.
  • the circuit according to the invention can comprise as many regulation modules as desired, each regulation module operating with a group of control LEDs.
  • FIGURE 6 is a schematic representation in the form of a diagram of an exemplary method according to the invention.
  • the method 600 comprises a step 602 for detecting a variation of the supply signal.
  • a step 604 determines whether the variation is an increase or a decrease in the power signal.
  • a step 606 provides power to an additional diode that was not powered before detecting the increase of the power signal.
  • a step 608 short circuits a diode that was energized before detecting the decrease in the power signal, so that it is no longer powered.
  • steps 604 and each of steps 606 and 608 can be performed at the same time.
  • the method 600 may include an optional step 610 measuring the amount of variation of the power signal and comparing that amount to a predetermined amount. Steps 606 and 608 can then be performed or not depending on this comparison.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP14170518.6A 2013-06-07 2014-05-30 Schaltkreis und Stromversorgungsverfahren von Dioden, Beleuchtungsvorrichtung auf der Grundlage von Dioden, die einen solchen Schaltkreis umfasst Withdrawn EP2811812A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1355266A FR3006848B1 (fr) 2013-06-07 2013-06-07 Circuit et procede d'alimentation de diodes, dispositif d'eclairage a base de diodes comprenant un tel circuit.

Publications (2)

Publication Number Publication Date
EP2811812A2 true EP2811812A2 (de) 2014-12-10
EP2811812A3 EP2811812A3 (de) 2015-10-28

Family

ID=48906399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14170518.6A Withdrawn EP2811812A3 (de) 2013-06-07 2014-05-30 Schaltkreis und Stromversorgungsverfahren von Dioden, Beleuchtungsvorrichtung auf der Grundlage von Dioden, die einen solchen Schaltkreis umfasst

Country Status (2)

Country Link
EP (1) EP2811812A3 (de)
FR (1) FR3006848B1 (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8324840B2 (en) * 2009-06-04 2012-12-04 Point Somee Limited Liability Company Apparatus, method and system for providing AC line power to lighting devices
US8384311B2 (en) * 2009-10-14 2013-02-26 Richard Landry Gray Light emitting diode selection circuit
US8456095B2 (en) * 2010-03-19 2013-06-04 Active-Semi, Inc. Reduced flicker AC LED lamp with separately shortable sections of an LED string
US8476836B2 (en) * 2010-05-07 2013-07-02 Cree, Inc. AC driven solid state lighting apparatus with LED string including switched segments
US8947014B2 (en) * 2010-08-12 2015-02-03 Huizhou Light Engine Ltd. LED switch circuitry for varying input voltage source
DE102010063985A1 (de) * 2010-12-22 2012-06-28 Bag Engineering Gmbh LED-Betriebsgerät
KR101174101B1 (ko) * 2011-07-26 2012-08-16 고관수 고효율 교류 구동 ｌｅｄ 모듈

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
FR3006848B1 (fr) 2019-04-26
FR3006848A1 (fr) 2014-12-12
EP2811812A3 (de) 2015-10-28

Similar Documents

Publication Publication Date Title
EP2991453B1 (de) Led-beleuchtungsvorrichtung
EP2783443B1 (de) Gesichertes und geregeltes kontinuierliches stromversorgungssystem mit mehreren eingängen
FR2881914A1 (fr) Bloc de commande d'eclairage destine a un appareil d'eclairage de vehicule
EP2966941B1 (de) System zur steuerung der stromversorgung und der wärmekontrolle von leuchtquellen
FR3013937A1 (fr) Circuit d'attaque avec une source lumineuse a base de semi-conducteurs, ainsi que procede de fonctionnement d'un circuit d'attaque
FR3022099A1 (fr) Dispositif d'eclairage avec organe de commande, et avion dote du dispositif d'eclairage
FR2928229A1 (fr) Regulateur de generation d'energie electrique de bord de vehicule
FR2845328A1 (fr) Lampe de vehicule a mode de fonctionnement multiple
FR2810808A1 (fr) Appareil de regulation de tension pour generateur electrique embarque
EP3088247A1 (de) Leuchtvorrichtung, die mehrere leuchtfunktionen eines kraftfahrzeugs mithilfe von jeweils funktionsdedizierten gruppen von lichtquellen erfüllt
FR2775825A1 (fr) Procede et dispositif pour commander un appareil utilisateur
FR2978007A3 (fr) Dispositif a diodes electroluminescentes
EP2811812A2 (de) Schaltkreis und Stromversorgungsverfahren von Dioden, Beleuchtungsvorrichtung auf der Grundlage von Dioden, die einen solchen Schaltkreis umfasst
FR2874151A1 (fr) Appareil d'allumage de lampe a decalage
FR3036222A1 (fr) Procede de commande d'un changement d'etat de fonctionnement d'un organe electromecanique, par exemple un relais, et dispositif correspondant
FR3090867A1 (fr) Gestion d’informations dans un module lumineux pour véhicule automobile comprenant des sources lumineuses à élément semi-conducteur
EP2916426B1 (de) Beleuchtungsvorrichtung, wie z. B. ein autonomer Sicherheitsbeleuchtungsblock, und Stromversorgungsverfahren eines Mikroprozessors in einer solchen Beleuchtungsvorrichtung
FR2999127A1 (fr) Dispositif d'eclairage comprenant un premier dispositif lumineux et un deuxieme dispositif lumineux susceptibles d'etre allumes selectivement
FR3023671B1 (fr) Procede d’alimentation et systeme d’eclairage
EP3355460B1 (de) Steuervorrichtung der stromzuführung zu den leuchtquellen eines kraftfahrzeugs
EP3403471A1 (de) Verfahren zur steuerung eines arbeitspunktes eines satzes elektronischer komponenten
EP3332608B1 (de) Optoelektronische schaltung mit leuchtdioden
FR3033975B1 (fr) Procede et systeme de surveillance de l'etat d'une diode electroluminescente d'un dispositif d'eclairage en cours de vie de la diode
FR2910639A1 (fr) Procede et dispositif de detection de la defaillance du circuit d'excitation d'un alternateur polyphase
FR2922373A1 (fr) Dispositif de maintien d'alimentation d'appareils electriques

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20140530

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RIC1 Information provided on ipc code assigned before grant

Ipc: H05B 33/08 20060101AFI20150924BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20160429