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EP3967110B1 - Convertisseur à del - Google Patents

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Publication number
EP3967110B1
EP3967110B1 EP20734235.3A EP20734235A EP3967110B1 EP 3967110 B1 EP3967110 B1 EP 3967110B1 EP 20734235 A EP20734235 A EP 20734235A EP 3967110 B1 EP3967110 B1 EP 3967110B1
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European Patent Office
Prior art keywords
led
converter
stage
primary side
current
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Application number
EP20734235.3A
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German (de)
English (en)
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EP3967110A1 (fr
Inventor
Ludwig Erasmus DE CLERCQ
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Tridonic GmbH and Co KG
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Tridonic GmbH and Co KG
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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges

Definitions

  • the present invention relates to a converter for the operation of at least one light source, in particular a converter circuit for the operation of a LED load having at least one LED.
  • a switched resonant circuit such as an isolated LLC converter can be included in driver circuits for operating LEDs which are basically known from the prior art.
  • driver circuits are powered by an electric supply source and the (isolated) resonant, e.g. LLC, LCC etc., converter is responsible for transferring power over a galvanic barrier from a primary side to a secondary side of the isolated resonant converter.
  • LCC converter is to be understood as any resonant converter and to include at least a LCC converter.
  • the LED load is driven off terminals at the secondary side of the LLC.
  • the differential current sensing block is also designated as a "tapping unit”.
  • the LLC converter further comprises a capacitor on the secondary side.
  • the LLC converter further comprises an auxiliary winding coupled to a primary winding of a transformer of the LLC converter.
  • the invention relates to a LED luminaire comprising an LED converter according to the first aspect or any one of the implementation forms thereof.
  • the invention relates to a method for an LED converter according to claim 10.
  • the aspect of the present invention might contain integrated circuits that are readily manufacturable using conventional semiconductor technologies, such as complementary metal-oxide semiconductor technology, short "CMOS".
  • CMOS complementary metal-oxide semiconductor technology
  • the aspects of the present invention may be implemented with other manufacturing processes for making optical as well as electrical devices.
  • the LED converter 100 comprises an isolated switched resonant stage supplying terminals for driving an LED load 106, wherein an LED current i LED is feedback-controlled based only on feedback-control signals from a primary side stage 102.
  • the LED converter 100 comprises a control unit 108 controlling at least one switch S 1 , S 2 of the switched resonant stage on the basis of the feedback-control signals.
  • this has the advantage that the current sensing for the LED converter abstains from a secondary-side 104 detection of the LED current and the value of the current is indirectly detected via the current on the primary side of the transformer.
  • Fig. 2 shows a further embodiment of an LED converter 200 according to the invention.
  • the LED converter is an LLC converter 200.
  • the LLC converter 200 comprises a primary side 102 and a secondary side 104.
  • the primary side 102 can be supplied by a DC voltage V BUS , for instance by a PFC as shown in Fig. 4 .
  • the sensing of the DC voltage V BUS may be used for PFC control, i.e. the control of a switch of the PFC, as well as for the control (frequency, duty cycle, deadtime between the on time of two switches connected in series) of at least one switch (S1, S2), preferably two switches connected in series, of the switched resonant stage by the control unit 108.
  • the DC voltage VBus isupplied to a capacitor CPFC the voltage of which is the DC supply voltage of an isolated switches resonant converter stage, which in the present example comprises a half-bridge converter with two switches S1, S2 connected in series and controlled by the control unit.
  • the midpoint voltage of the half-bridge converter S1, S2 is fed to a series resonance circuitry L1, C2.
  • the inductor L1 is the primary winding of a transformer T which comprises a secondary winding L2.
  • the voltage across the secondary winding L2 is supplied to a rectifier 204 feeding a capacitor C3.
  • the DC voltage across the capacitor C3 is the supply voltage of the LED load 106.
  • the switches S1, S2 are controlled by corresponding control signals from the control unit 108.
  • the primary side 102 can comprise a tapping unit 200a, also called “differential sensing block", wherein the tapping unit 200a can comprise a sensing resistor R s , a capacitor C f in parallel to R s , two resistors R f1 , R f2 .
  • the resistor R f1 is in parallel to the resistor R f2 and the resistance value of R f1 is equal to the resistance value of R f2 .
  • the capacitor C f can be connected between R f1 and R f2
  • the resistor R s can be connected between R f1 and R f2 .
  • the tapping unit 200a can be configured to tap off a first voltage value used to detect the current i snsp between the resistor R f1 and the capacitor C f , and a second voltage value used to detect the current i sns1 between the resistor R f2 and the capacitor C f .
  • this is an example of a differential sensing of the current flow through the resistor Rs.
  • the resistor Rs senses the current flowing through the capacitor Cpfc. This is one example of sensing a current flow on the primary side of the isolation stage of isolated switched resonant stage, and which is used to calculate (see further below) a secondary side current, especially the LED current to be feed-back controlled by the control unit.
  • the controller 108 can be configured to perform the following steps:
  • the LLC converter 200 can even comprise a smoothing circuit on the secondary side 104, the capacitor C 3 in the embodiment shown in Fig. 2 , wherein the smoothing circuit is configured to smooth the ripple at the output of the LLC converter 200 in order to obtain a smoothed voltage.
  • the LLC converter 200 can further comprise an auxiliary winding coupled to a primary winding L 1 of a transformer T of the LLC converter 200.
  • the LED voltage V LED is indirectly measured, indirectly meaning by an electric parameter tapped off the primary side 102 of the isolated LLC converter 200.
  • this is done using the auxiliary winding coupled to the primary winding L1 of the transformer T.
  • Fig. 2a shows an alternative embodiment to Figure 2 .
  • the relevant difference to Figure 2 resides in the fact that the tapping unit 200a is connected as a shunt in series to the lower potential half-bridge switch S2.
  • the tapping unit 200a acts as a current sensing block.
  • the half-bridge comprising the switches S1, S2, of the resonant converter
  • the current fed into the resonant converter flows during the switch on-times of the resp. switch through that switch.
  • the current flows during the first half through the first switch S1 (upper) and second half back through the second (low side) switch S2 - thus sensing can be done at this sensing point in series to the switch S2.
  • the tapping unit (current sensing block) 200a of this embodiment is also designed for a differential current sensing. It comprises a shunt resistor Rs, two differential resistors Rf1, Rf2 connected by a capacitor Cf. The voltage across the capacitor Cf is lead to two output terminals Isns1, Isns2 connected to corresponding input terminals of the control unit, such that the control unit can process these two differential sensing in order to obtain a value representing the current flowing into the converter.
  • Fig. 3 shows a schematic diagram of a method 300 for an LED converter 100.
  • the method 300 comprises the steps of:
  • the feedback-control signals comprise:
  • Fig. 4 shows schematic representation of an alternative embodiment of an LED converter 500.
  • the driver 500 comprises a converter 200, for instance a half bridge LLC HB-LLC or LCC converter.
  • the converter 200 can be any one of the converters 100 of the Figs. 1 to 2a .
  • the converter 200 comprises a primary side stage 102 and a secondary side 104.
  • the primary side stage 102 comprises a primary winding L1 of a transformer T and the secondary side 104 comprises a secondary winding L2 of the transformer T, whereby the secondary side 104 is magnetically coupled to the primary side stage 102 via the transformer T.
  • the driver 500 can further comprise an electromagnetic interference (EMI) filter 501 that forwards an input voltage to an activelely switched PFC 503, in particular a boost PFC circuit.
  • EMI electromagnetic interference
  • the PFC 503 can in turn supply the primary side 102 of the converter 200 with a DC voltage V BUS .
  • the driver 500 can further comprise a control unit implemetee e.g. as an ASIC 508.
  • the ASIC 508 can correspond to the control unit 108 or to a component of the control unit 108 from Figs. 1 to 2a .
  • the ASIC 508 can be configured to perform a feedback control of the secondary side voltage of the converter 504 and/or the PFC circuitry 503 by means of a control of the switches of the half bridge of the half bridge LLC or LCC.
  • the control unit (ASIC) 508 may be supplied by a secondary side feedback signal, preferably form a secondary side rectification stage, via an isolation stage (transformer) 505b. However, the control unit is not supplied with a secondary side LED current sensing signal.
  • the driver 500 can further comprise a low voltage power supply 507 which can be configured to supply integrated circuits of the driver 500, e.g. the ASIC 508, with a low DC supply voltage.
  • a low voltage power supply 507 which can be configured to supply integrated circuits of the driver 500, e.g. the ASIC 508, with a low DC supply voltage.
  • the driver 500 can further comprise a microcontroller 509, which can be configured to control the ASIC 508 and bidirectionally communicate with the ASIC 508.
  • the microcontroller 509 can send signals to the ASIC 508 in order to control the ASIC 508, e.g. adjust a lamp brightness.
  • the microcontroller 509 can receive signals from the ASIC 508, e.g. lamp fault detection.
  • the driver 500 comprises a rectification and sensing circuit 506, which is isolated from the other components of the driver 500 and coupled to the converter 504 and ASIC 508 via two transformers 505a, 505b.
  • the driver 500 can further comprise a dimming interface 513, e.g. DALI interface, which is isolated e.g. via an optocoupler 511a, 511b from the microcontroller 509. Signals can be exchanged between the dimming interface 513 and the microcontroller 509 via two optocouplers 511a, 511b.
  • a dimming interface 513 e.g. DALI interface
  • an optocoupler 511a, 511b from the microcontroller 509. Signals can be exchanged between the dimming interface 513 and the microcontroller 509 via two optocouplers 511a, 511b.

Landscapes

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

Claims (10)

  1. Convertisseur à DEL (100), comprenant :
    - un étage côté primaire (102) et un étage côté secondaire (104) ;
    - un étage résonant commuté isolé fournissant des bornes pour piloter une charge de DEL (106), dans lequel un courant de DEL iLED est contrôlé par rétroaction uniquement en fonction de signaux de contrôle par rétroaction provenant de l'étage côté primaire (102) du convertisseur à DEL (100) ;
    - une unité de contrôle (108) contrôlant au moins un commutateur (S1, S2), de préférence deux commutateurs alternativement cadencés connectés en série, de l'étage résonant commuté en fonction des signaux de contrôle par rétroaction fournis à l'unité de contrôle (108), caractérisé en ce que lesdits signaux de contrôle par rétroaction comprennent :
    a) un signal représentant la tension aux bornes de la charge de DEL VLED, dans lequel la tension de DEL VLED est indirectement mesurée, indirectement signifiant par un paramètre électrique prélevé sur l'étage côté primaire (102) ;
    b) un signal indiquant une tension d'alimentation en courant continu du côté primaire VBUS ; et
    c) au moins un signal représentant le courant détecté au niveau du côté primaire et représentant le courant circulant du côté primaire de l'étage d'isolation de l'étage résonant commuté isolé.
  2. Convertisseur à DEL (100) selon la revendication 1, dans lequel le convertisseur à DEL (100) est un convertisseur résonant isolé, par ex. un convertisseur LLC en demi-pont.
  3. Convertisseur à DEL (100) selon la revendication 1 ou la revendication 2,
    dans lequel l'au moins un signal représentant le courant du côté primaire de l'étage d'isolation de l'étage résonant commuté isolé comprend deux signaux détectés de manière différentielle.
  4. Convertisseur à DEL selon l'une quelconque des revendications précédentes, dans lequel l'au moins un signal représentant le courant du côté primaire de l'étage d'isolation de l'étage résonant commuté isolé est détecté par un bloc de détection de courant différentiel en série avec un condensateur stabilisant une tension d'alimentation en courant continu du convertisseur, ou en série avec ledit au moins un commutateur.
  5. Convertisseur à DEL (100) selon la revendication 3 ou 4, dans lequel le convertisseur à DEL (100) comprend en outre un redresseur (204) et dans lequel le contrôleur (108) est en outre configuré pour déterminer le courant circulant à travers la DEL iLED la base de l'équation suivante : i LED = V BUS ⋅ < sensing > R S V LED + 4 V D
    Figure imgb0015
     dans laquelle VD est une chute de tension d'une diode du redresseur (204), et « sensing » est la différence entre deux valeurs de détection de courant des valeurs de courant différentiel produites par une unité de prélèvement (200a) agissant comme un bloc de détection de courant différentiel, dans lequel l'unité de prélèvement comprend une résistance de détection Rs.
  6. Convertisseur à DEL (100) selon la revendication 5, dans lequel le contrôleur (108) est en outre conçu pour estimer une puissance du redresseur Prect sur la base de l'équation suivante : P rect = i LED 4 V LED .
    Figure imgb0016
  7. Convertisseur à DEL (100) selon l'une quelconque des revendications précédentes 2 à 5, dans lequel le convertisseur à DEL (100) est un convertisseur LLC qui comprend en outre un condensateur sur le côté secondaire.
  8. Convertisseur à DEL (100) selon les revendications 2 à 7, dans lequel le convertisseur LLC comprend en outre un enroulement auxiliaire couplé à un enroulement primaire (L1) d'un transformateur (T) du convertisseur LLC.
  9. Luminaire à DEL comprenant un convertisseur à DEL (100) selon l'une quelconque des revendications précédentes.
  10. Procédé (300) pour un convertisseur à DEL (100) avec un étage côté primaire (102), un étage côté secondaire (104) et un étage résonant commuté isolé, comprenant :
    - la fourniture (302) de bornes pour piloter une charge de DEL (106) à l'aide de l'étage résonant commuté isolé,
    - le contrôle par rétroaction (304) d'un courant de DEL iLED uniquement en fonction de signaux de contrôle par rétroaction provenant de l'étage côté primaire (102) du convertisseur à DEL (100) ;
    - le contrôle (306) d'au moins un commutateur (S1, S2) d'un étage résonant commuté en fonction des signaux de contrôle par rétroaction, dans lequel lesdits signaux de contrôle par rétroaction comprennent :
    a.) un signal représentant la tension aux bornes de la charge de DEL VLED, dans lequel la tension de DEL VLED est indirectement mesurée, indirectement signifiant par un paramètre électrique prélevé sur l'étage côté primaire (102) ;
    b.) un signal indiquant une tension d'alimentation en courant continu du côté primaire VBUS ; et
    c.) un signal de courant détecté de manière différentielle représentant le courant circulant du côté primaire d'un étage d'isolation de l'étage résonant commuté isolé.
EP20734235.3A 2019-06-27 2020-06-29 Convertisseur à del Active EP3967110B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19182817 2019-06-27
PCT/EP2020/068218 WO2020260686A1 (fr) 2019-06-27 2020-06-29 Convertisseur à del

Publications (2)

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EP3967110A1 EP3967110A1 (fr) 2022-03-16
EP3967110B1 true EP3967110B1 (fr) 2024-08-07

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101622777B (zh) * 2007-02-27 2012-08-29 Nxp股份有限公司 电能转换器中的负载电流检测
DE102012007478B4 (de) * 2012-04-13 2023-08-03 Tridonic Gmbh & Co Kg Wandler für ein Leuchtmittel, LED-Konverter und Verfahren zum Betreiben eines Wandlers
US9185767B2 (en) * 2013-04-19 2015-11-10 Cirrus Logic, Inc. Self-oscillating resonant converter-based light emitting diode (LED) driver

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EP3967110A1 (fr) 2022-03-16

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