EP3603344B1 - Circuit électronique pour piloter une chaîne de diodes électroluminescentes - Google Patents

Circuit électronique pour piloter une chaîne de diodes électroluminescentes Download PDF

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Publication number
EP3603344B1
EP3603344B1 EP18717700.1A EP18717700A EP3603344B1 EP 3603344 B1 EP3603344 B1 EP 3603344B1 EP 18717700 A EP18717700 A EP 18717700A EP 3603344 B1 EP3603344 B1 EP 3603344B1
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Prior art keywords
voltage
terminal
string
light
emitting diodes
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EP18717700.1A
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German (de)
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EP3603344A1 (fr
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Sandro Toffoletto
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Cynergi Srl
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Cynergi Srl
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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
    • H05B45/48—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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix

Definitions

  • the present invention concerns a circuit for driving a string of light-emitting diodes.
  • LEDs light-emitting diodes
  • the lamp is implemented using a string of LEDs, that is a plurality of LEDs serially connected each other (optionally arranged in groups, each one composed of several LEDs), in such a way that the series provides the luminosity required by the application.
  • the distributed line voltage is an alternating type (typically at 50 Hz) and has high values (typically an effective value of 120 or 220-230 Volts), it is necessary to use appropriate devices to convert the alternating voltage into lower values such to enable the LED string to be driven correctly.
  • a first solution for driving the LED string is to use an AC-DC converter (for example of the SMPS - switch mode power supply type) which converts alternating voltage into direct voltage with lower values (for example, 60 Volts).
  • AC-DC converter for example of the SMPS - switch mode power supply type
  • the first solution is efficient from an energy standpoint, but requires the use of transformers and large inductors and capacitors, which thus occupy space and moreover reduce reliability.
  • a second solution (commonly referred to as AC "direct drive”) is to avoid the use of AC-DC converters, i.e. the LED string is driven directly using alternating voltage and the LEDs light up in sequence following the sinusoidal waveform of the alternating voltage, through the use of appropriate control circuits; for example, use can be made of the integrated circuits identified with the codes TPS92410, by Texas Instruments, NSl45020, by ON Semiconductor, lS31LT3170, by ISSI and the Acrich family by Seoul Semiconductor.
  • the second solution (and in part also the first) poses the problem of flicker in the LED string , i.e. the luminous intensity of the LED string is not constant over time as part of the LEDs of the string pulses following the frequency of the half wave generated by the rectifier with a frequency that is typically double that of the alternating voltage of the electric line: this could induce visual fatigue and loss of concentration for the people present in the environment illuminated by the LED string in the event of long stays, as in the case of work environments.
  • the known direct AC drive solutions are capable of only partly reducing flicker in the LED string and, furthermore, have other disadvantages, such as, for example, that of requiring the use of an external reference voltage (generated, for example, by a battery; see US 9232576 ), or using an alternating voltage with a frequency higher than that of the line voltage, or it can function only with low values of the alternating voltage supply (again see US 9232576 ).
  • US 2013/0162149 A1 discloses a lighting apparatus including an energy storage module for applying power to a LED string during low power intervals.
  • US 2013/0313984 A1 discloses a circuit for actuating a plurality of LEDs connected in series, the circuit comprising a plurality of electronic switches arranged in parallel with at least part of the plurality of LEDs.
  • the present invention relates to an electronic circuit for driving a string of light-emitting diodes as defined in the enclosed claim 1 and by its preferred embodiments described in the dependent claims 2 to 8.
  • FIG. 1 shows an electronic circuit 1 for driving a string 5 of light-emitting diodes according to a first embodiment of the invention.
  • string of diodes means a series connection of two or more light-emitting diodes, hereinafter indicated as LEDs.
  • a LED string can be divided into a plurality of segments, each segment comprising the series connection of a plurality of LEDs.
  • two or more LEDs connected in series can be grouped in such a way as to form a group of LEDs and thus a LED string can be composed of two or more groups of LEDs.
  • one or more groups (or segments) of LEDs can be in turn composed of the parallel connection of two or more series of LEDs.
  • the electronic driving circuit 1 comprises:
  • the rectifier 3 comprises two input terminals adapted to receive a positive alternating voltage V AC + and a negative alternating voltage V AC - and comprises an output terminal adapted to generate a rectified alternating voltage V RTF , as a function of the positive and negative alternating voltages V AC + and V AC -.
  • the rectifier 3 is implemented with a full wave diode bridge, as shown in Figure 1 .
  • the current regulator 4 is electrically connected to the rectifier 3 and to the LED string 5.
  • the current regulator 4 comprises an input terminal It 0 adapted to receive the rectified alternating voltage V RTF and comprises four input terminals It 1 , It 2 , It 3 , It 4 electrically connected to four respective different voltages of the LED string 5, as will be explained in greater detail below.
  • the current regulator 4 has the function of regulating the total value of the current l str flowing across the LED string 5, as will be explained in greater detail below.
  • the current regulator 4 is an integrated circuit by Altoran Chip & Systems (www.altoranCNS.com), identified with the code ACS1404.
  • the LED string 5 comprises a first terminal connected to the rectified alternating voltage V RTF and comprises a second terminal connected to the current regulator 4.
  • the LED string 5 comprises the series connection of four LEDs 5-1, 5-2, 5-3, 5-4, wherein:
  • the first input terminal It 1 of the current regulator 4 is connected to the anode a 2 of the second LED 5-2
  • the second input terminal It 2 of the current regulator 4 is connected to the anode a 3 of the third LED 5-3
  • the third input terminal It 3 of the current regulator 4 is connected to the anode a 4 of the fourth LED 5-4
  • the fourth input terminal It 4 of the current regulator 4 (i.e. the second terminal of the LED string 5) is connected to the cathode c 4 of the fourth LED 5-4.
  • each of the LEDs 5-1, 5-2, 5-3, 5-4 can be a series connection of two or more LEDs, that is, each series connection is a segment of the LED string 5.
  • the component 5-1 represents a first group of LEDs connected in series (i.e. a first segment of the LED string 5)
  • the component 5-2 represents a second group of LEDs connected in series (i.e. a second segment of the LED string 5)
  • the component 5-3 represents a third group of LED connected in series (i.e. a third segment of the LED string 5)
  • the component 5-4 represents a fourth group of LEDs connected in series (i.e. a fourth segment of the LED string 5).
  • the current regulator 4 is such to control:
  • the electronic switch 6 comprises a first terminal It 6 , a second terminal Ot 7 and a control terminal It 7 for controlling the opening and closing of the electronic switch 6.
  • the electronic switch 6 is switchable between an open position and a closed position as a function of the value of a control signal V g on the control terminal It 7 , wherein:
  • the capacitor 7 is interposed between the first terminal of the LED string 5 and the electronic switch 6.
  • the capacitor 7 comprises a first terminal connected to the anode a 1 of the first LED 5-1 (and thus connected to the output of the rectifier 3) and thus it is such to have the value of the rectified alternating voltage V RTF .
  • the capacitor 7 further comprises a second terminal connected to the first terminal It 6 of the electronic switch 6.
  • the capacitor 7 has the function of storing electric energy in each period of the rectified alternating voltage V RTF when the latter has an increasing trend (or is in any case greater than a threshold voltage V th ).
  • the capacitor 7 has the function of discharging the electric energy stored therein at least in part through the LED string 5, when the rectified alternating voltage V RTF has a decreasing trend and smaller than the threshold voltage V th : this allows to reduce the flicker of the luminous intensity of the LED string 5.
  • the electronic switch 6 is implemented with a transistor 6-1 of the n-channel IGBT (insulated gate bipolar transistor) type, having a collector terminal C which coincides with the first terminal It 6 , having an emitter terminal E which coincides with the second terminal Ot 7 and having a gate terminal G which coincides with the control terminal It 7 ; therefore, in this case the collector terminal C of the IGBT transistor 6-1 is connected to the second terminal of the capacitor 7, the emitter terminal E is connected to the ground reference voltage and the gate terminal G is connected to the output of the bias stage 8.
  • IGBT insulated gate bipolar transistor
  • the electronic switch 6 (in particular, the IGBT transistor 6-1) has the function of switching the capacitor 7 during charging/discharging in an active manner, as will be explained in greater detail below.
  • the electronic switch 6 is implemented with a p-channel IGBT transistor 6-2, as shown in Figure 3 .
  • components other than the IGBT transistor can be used, provided that they are capable of switching between the open and closed conditions with a frequency of around 100 Hz, i.e. a switching period comprised between 1 millisecond and 12 milliseconds.
  • the bias stage 8 is interposed between the LED string 5 and the electronic switch 6.
  • the bias stage 8 comprises an input terminal It 5 adapted to receive a voltage signal V d3 selected from a voltage internal to the LED string 5 and comprises an output terminal connected to the control terminal It 7 of the electronic switch 6.
  • the bias stage 8 has the function of generating an appropriate value of the control signal V g of the control terminal It 7 so as to control the closing and opening of the electronic switch 6 at appropriate time instants in order to charge and discharge the capacitor 7 with the purpose of reducing the flicker of the luminous intensity of the LED string 5, caused mainly by the third and fourth LEDs 5-3, 5-4.
  • choosing a voltage value V d3 selected from a voltage internal to the LED string 5 allows to anticipate (with respect to the known solution) the instant wherein it is activated the discharging of the capacitor 7 through the LED string 5 and this allows a larger number of light-emitting diodes of the string 5 to be maintained in a conduction state, thus reducing flicker of the luminous intensity of the LED string 5.
  • the input terminal of the bias stage 8 is connected to the anode a 4 of the fourth LED 5-4 and thus the voltage signal V d3 is the voltage of the anode a 4 of the fourth LED 5-4 (which is equal to the cathode voltage of the third LED 5-3).
  • the bias stage 8 is alternatively such to draw the voltage signal V d3 from voltage values different than the voltage of the anode a 4 of the fourth LED 5-4, such as for example the voltage of the anode a 3 of the third LED 5-3, as shown in Figure 2 in the second embodiment.
  • the bias stage 8 is such to draw a voltage value V d3 selected from a voltage internal to the LED string 5 so as to generate, as a function of the selected internal voltage value, a value of a control voltage signal V g that is less than the value of the rectified alternating voltage V RTF , provided that said selected voltage value V d3 is such to generate the control voltage V g controlling the closing of the electronic switch 6 so as to allow a sufficient charging at the appropriate time of the capacitor 7, whose charge is subsequently used to power the LED string 5 when the value of the rectified alternating voltage V RTF is not sufficient to power all of the LEDs of the string 5: in this way the flicker of the luminous intensity generated by the LED string 5 is reduced.
  • the bias stage 8 is implemented with a voltage divider comprising a first resistor 8-1 and a second resistor 8-2 serially connected each other, wherein the first resistor 8-1 is connected between the voltage V d3 selected from the LED string 5 and the control terminal It 7 of the electronic switch 6 and wherein the second resistor 8-2 is connected between the control terminal It 7 of the electronic switch 6 and the ground reference voltage.
  • the electronic switch 6 When the rectified alternating voltage V RTF has an increasing trend (or is in any case greater than the threshold voltage V th ), the electronic switch 6 is closed and the capacitor 7 is charged; when, by contrast, the rectified alternating voltage V RTF has a decreasing trend and is less than the threshold voltage V th , the electronic switch 6 opens and the capacitor 7 is discharged.
  • the discharge phase of the capacitor 7 allows at least part of the energy stored therein to be discharged through the LED string 5 and this allows to compensate the reduction of the voltage at the ends of the LEDs string 5, thus considerably reducing (even to the extent of eliminating) the flicker of the luminous intensity of the LEDs string 5.
  • the time instant wherein the discharge phase of the capacitor 7 occurs will vary depending on which voltage signal V d3 is selected from the LED string 5; therefore it is possible to anticipate or postpone the activation of the capacitor 7 discharge (and thus modify the entity of the reduction of the flicker of the luminous intensity of the LED string 5) by changing the selected voltage signal V d3 and thus changing the value of the selected voltage.
  • the electronic driving circuit 1 further comprises a discharge circuit 9 connected to the capacitor 7 (for example, interposed between the first terminal of the capacitor 7 and the ground reference voltage) and having the function of further contributing to the discharging of the capacitor 7.
  • the discharge circuit 9 is implemented with a resistor 9-1 having a first terminal connected to the first terminal of the capacitor 7 (and thus connected to the output of the rectifier 3) and having a second terminal connected to the ground reference voltage.
  • three periods of time ⁇ T1, ⁇ T2, ⁇ T3 are shown, comprised between the instants to and t10, t10 and t20, t20 and t30, respectively.
  • the electronic driving circuit 1 or 100 can be implemented with an integrated circuit.
  • the electronic driving circuit 1 or 100 can be realised on one or more printed circuit boards.
  • FIG. 2 shows an electronic circuit 50 for driving a string 4 of light-emitting diodes according to a second embodiment of the invention.
  • the electronic driving circuit 50 of Figure 2 differs from the electronic driving circuit 1 of Figure 1 in that the input of the bias stage 8 is the voltage signal V d2 drawn from the anode a 3 of the third LED 5-3; therefore, the value of said voltage signal V d2 controls the opening and the closing of the electronic switch 6 (in particular, it controls the cut-off and conduction state of the IGBT transistor 6-1).
  • the previous considerations related to the electronic driving circuit 1 may be similarly applied to the electronic driving circuit 50, therefore, the latter, too, is capable of considerably reducing (even to the extent of eliminating) flicker of the luminous intensity of the LED string 5.
  • FIG. 3 shows an electronic circuit 100 for driving a string 5 of light-emitting diodes according to a third embodiment of the invention.
  • the electronic driving circuit 100 of Figure 3 differs from the electronic driving circuit 1 of Figure 1 in that:
  • the bias stage 108 is implemented with a voltage divider comprising the resistors 8-1, 8-2, 8-3, wherein:
  • the previous considerations related to the electronic driving circuit 1 may be similarly applied to the electronic driving circuit 100; therefore, the latter, too, is capable of considerably reducing (even to the extent of eliminating) flicker of the luminous intensity of the LED string 5.
  • the input terminal of the bias stage 108 can be connected to other voltage values selected from the LED string 5, such as, for example, the voltage of the anode a 3 of the third LED 5-3, similarly to what was illustrated previously in relation to the description of Figure 2 .
  • the electronic driving circuit 1 further comprises a disconnecting stage having the function of disconnecting the LED string 5 from the alternating voltage supply V AC + so as to interrupt parasitic currents which can activate the LEDs also with a null power signal.
  • the LED string 5 when the value of the alternating voltage supply V AC + is less than a defined threshold value (for example equal to 10% of a reference voltage value V REF ), the LED string 5 is disconnected from the rectified alternating voltage V_RTF; when the value of the alternating voltage supply V AC + is instead greater than or equal to the defined threshold value, the LED string 5 is connected to the rectified voltage V_RTF.
  • a defined threshold value for example equal to 10% of a reference voltage value V REF
  • the disconnecting stage is implemented using a reference voltage V REF generated by the current regulator 4 (for example, equal to 17 Volts), using the pulse-width modulator already used to regulate the luminous intensity of the LED string 5 and using a solid-state relay that interrupts the electrical connection between the rectified alternating voltage V_RTF and the LED string of 5.
  • V REF generated by the current regulator 4
  • the pulse-width modulator already used to regulate the luminous intensity of the LED string 5
  • a solid-state relay that interrupts the electrical connection between the rectified alternating voltage V_RTF and the LED string of 5.
  • the disconnecting stage comprises:
  • the rectified alternating voltage V RTF has an increasing sinusoidal trend from the null value to the value of the threshold voltage V th : the IGBT transistor 6-1 is in the cut-off state, the capacitor 7 is discharged in part through the LED string 5 and in part through the resistor 9 and this allows to maintain the LEDs 5-1, 5-2, 5-3, 5-4 in the conduction state.
  • V RTF 3*Vt.
  • the rectified alternating voltage V RTF continues to have an increasing sinusoidal trend and thus the operation is analogous to that at the instant t3, i.e. the IGBT transistor 6-1 conducts and the capacitor 7 is charged to the value of the rectified alternating voltage V RTF .
  • the rectified alternating voltage V RTF reaches a value equal to four times the threshold voltage Vt: the voltage of the gate terminal V g continues to have a high value (in the example considered, equal to 5 Volts) and thus the IGBT transistor 6-1 remains in the conduction state and the capacitor 7 continues to charge.
  • the rectified alternating voltage V RTF falls below the value 3*Vt
  • the value of the voltage V d3 of the cathode of the third LED 5-3 decreases and thus the voltage of the gate terminal V g has a transition from the high voltage value to the low voltage value: consequently, the IGBT transistor 6-1 enters the cut-off state and the capacitor 7 starts discharging in part through the resistor 9-1 and in part through the LED string 5, maintaining not only the first and second LEDs 5-1, 5-2, but also the third and fourth LEDs 5-3, 5-4 in the conduction state.
  • the rectified alternating voltage V RTF continues to have a decreasing sinusoidal trend until reaching the null value: the capacitor 7 continues to discharge in part through the resistor 9-1 and in part through the LED string of 5, maintaining the first and second LEDs 5-1, LED 5-2 and also the third and fourth LEDs 5-3, 5-4 in the conduction state.
  • the operation of the electronic driving circuit 1 is analogous to that previously described for the instants comprised between t0 and t3; therefore, the IGBT transistor 6-1 is in the cut-off state, the capacitor 7 is discharged in part through the LED string 5 and in part through the resistor 9 and this discharging maintains the third and fourth LEDs 5-3, 5-4, in addition to the first and second LEDs 5-1, 5-2, in the conduction state.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Claims (11)

  1. Circuit électronique de pilotage (1) pour piloter une chaîne (5) de diodes électroluminescentes, le circuit comprenant :
    - un régulateur de courant (4) comprenant une première borne d'entrée (Ito) configurée pour recevoir une tension alternative redressée (VRTF) et une pluralité de secondes bornes d'entrée (It1, It2, It3, It4) pouvant être connectées à différentes tensions respectives présentes dans la chaîne (5) de diodes électroluminescentes, le régulateur de courant (4) étant configuré pour réguler la valeur du courant circulant à travers la chaîne de diodes électroluminescentes ;
    - un interrupteur électronique (6) configuré pour commuter entre une position fermée et une position ouverte, en fonction d'une valeur d'un signal de contrôle (Vg) ;
    - un condensateur (7) adapté pour être interposé entre l'interrupteur électronique (6) et la chaîne (5) de diodes électroluminescentes ;
    caractérisé en ce que le circuit électronique de pilotage comprend de plus :
    - un étage de polarisation (8) consistant en un diviseur de tension (8-1, 8-2) connecté à la référence à la masse, dans lequel ledit étage de polarisation comprend une borne d'entrée configurée pour recevoir l'une des tensions internes à la chaîne (5) de diodes électroluminescentes et une borne de sortie configurée pour générer, en fonction de la tension reçue à sa borne d'entrée, ledit signal de contrôle (Vg) contrôlant l'interrupteur électronique (6),
    dans lequel le signal de contrôle (Vg) généré par l'étage de polarisation (8) est la tension divisée du diviseur de tension (8-1, 8-2).
  2. Circuit électronique de pilotage selon la revendication 1, dans lequel :
    - lorsque la tension alternative redressée (VRTF) a des valeurs inférieures à une tension de seuil (Vth), l'étage de polarisation (8) est configuré pour générer le signal de contrôle (Vg) ayant une première valeur qui ouvre l'interrupteur électronique (6), de sorte que le condensateur (7) est déchargé au moins en partie à travers la chaîne de diodes électroluminescentes ;
    - lorsque la tension alternative redressée (VRTF) a des valeurs supérieures à la tension de seuil (Vth), l'interrupteur électronique (6) est configuré dans la position fermée, de sorte que le condensateur (7) est chargé.
  3. Circuit électronique de pilotage selon la revendication 1 ou 2, dans lequel l'interrupteur électronique (6) est un transistor bipolaire à grille isolée à canal N (6-1) comportant une sortie collecteur (C), une connexion d'émetteur (E) et une gâchette (G), dans lequel :
    - la sortie collecteur (C) est connectée à une première borne du condensateur (7) ;
    - la connexion d'émetteur (E) est connectée à une tension de référence à la masse ;
    - la gâchette (G) est connectée à la borne de sortie de l'étage de polarisation (8) et est configurée pour recevoir le signal de contrôle (Vg) ayant une valeur de tension contrôlant la commutation du transistor bipolaire à grille isolée à canal N (6-1) entre un état de conduction dans lequel le condensateur (7) est chargé et un état d'interdiction dans lequel le condensateur (7) est déchargé au moins en partie à travers la chaîne de diodes électroluminescentes ;
    - la seconde borne du condensateur (7) pouvant être connectée à la tension alternative redressée et à une première borne (a1) de la chaîne (5) de diodes électroluminescentes ;
    - le régulateur de courant (4) pouvant être connecté à une seconde borne (c4) de la chaîne (5) de diodes électroluminescentes.
  4. Circuit électronique de pilotage selon l'une quelconque des revendications précédentes, comprenant de plus un circuit de décharge (9) connecté au condensateur (7), le circuit de décharge étant en particulier une résistance (9-1) connectée entre le condensateur et la tension de référence à la masse.
  5. Circuit électronique de pilotage selon la revendication 3 ou selon la revendication 4 lorsqu'elle dépend de la revendication 3, dans lequel la tension divisée du diviseur de tension (8-1, 8-2) est adaptée pour contrôler la gâchette (G) du transistor bipolaire à grille isolée (6-1).
  6. Circuit électronique de pilotage selon l'une quelconque des revendications précédentes, dans lequel la tension reçue à la borne d'entrée de l'étage de polarisation (8) est la tension de la borne d'anode de la dernière diode électroluminescente (5-4) de la chaîne de diodes électroluminescentes.
  7. Circuit électronique de pilotage selon l'une quelconque des revendications 1 à 5, dans lequel la tension reçue à la borne d'entrée de l'étage de polarisation (8) est la tension de la borne d'anode (a3) de l'avant-dernière diode électroluminescente (5-3) de la chaîne de diodes électroluminescentes.
  8. Circuit électronique de pilotage selon l'une quelconque des revendications précédentes, comprenant de plus un redresseur (3) en pont de diodes configuré pour recevoir une tension alternative (VAC+, VAC-) et pour générer à partir de celle-ci la tension alternative redressée (VRTF).
  9. Lampe pour éclairer des environnements, comprenant une chaîne (5) de diodes électroluminescentes et le circuit électronique de contrôle selon l'une quelconque des revendications précédentes, dans laquelle la première borne (a1) de ladite chaîne de diodes électroluminescentes peut être connectée à la tension alternative redressée et dans laquelle la seconde borne (c4) de ladite chaîne de diodes électroluminescentes est connectée au régulateur de courant (4) dudit circuit électronique (1).
  10. Lampe selon la revendication 9, dans laquelle la chaîne (5) de diodes électroluminescentes comprend une pluralité de segments connectés, respectivement, à la pluralité de secondes bornes d'entrée (It1, It2, It3, It4) du régulateur de courant (4) du circuit électronique de contrôle, chaque segment comprenant la connexion en série d'une pluralité de diodes électroluminescentes.
  11. Circuit intégré comprenant au moins un circuit électronique de pilotage selon l'une quelconque des revendications de 1 à 8.
EP18717700.1A 2017-03-24 2018-03-23 Circuit électronique pour piloter une chaîne de diodes électroluminescentes Active EP3603344B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000032546A IT201700032546A1 (it) 2017-03-24 2017-03-24 Circuito elettronico per il pilotaggio di una stringa di diodi ad emissione di luce
PCT/IB2018/051963 WO2018172980A1 (fr) 2017-03-24 2018-03-23 Circuit électronique pour piloter une chaîne de diodes électroluminescentes

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EP3603344B1 true EP3603344B1 (fr) 2022-07-20

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BR (1) BR112019019975A2 (fr)
ES (1) ES2928692T3 (fr)
IT (1) IT201700032546A1 (fr)
LT (1) LT3603344T (fr)
MA (1) MA48993B1 (fr)
WO (1) WO2018172980A1 (fr)

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IT201900017960A1 (it) 2019-10-04 2021-04-04 Cynergi S R L Lampada LED per illuminazione con controllo radio
EP4072248B1 (fr) * 2021-04-08 2024-08-07 Controlled Oy Circuit de réduction de scintillement
WO2023050290A1 (fr) * 2021-09-30 2023-04-06 深圳市汇顶科技股份有限公司 Circuit de génération de signal d'impulsion d'onde sinusoïdale et appareil électronique associé
CN220273903U (zh) * 2023-03-08 2023-12-29 周国安 一种led线串上有整流滤波的圣诞高压串灯

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US8823271B2 (en) * 2011-12-27 2014-09-02 Cree, Inc. Solid-state lighting apparatus including an energy storage module for applying power to a light source element during low power intervals and methods of operating the same
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MA48993A (fr) 2020-02-05
IT201700032546A1 (it) 2018-09-24
EP3603344A1 (fr) 2020-02-05
WO2018172980A1 (fr) 2018-09-27
ES2928692T3 (es) 2022-11-22
MA48993B1 (fr) 2022-10-31
LT3603344T (lt) 2023-01-25

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