EP3713376B1 - Détection améliorée de court-circuit de del et de charge ouverte à l'aide d'une seule broche de contrôleur - Google Patents

Détection améliorée de court-circuit de del et de charge ouverte à l'aide d'une seule broche de contrôleur Download PDF

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Publication number
EP3713376B1
EP3713376B1 EP19163603.4A EP19163603A EP3713376B1 EP 3713376 B1 EP3713376 B1 EP 3713376B1 EP 19163603 A EP19163603 A EP 19163603A EP 3713376 B1 EP3713376 B1 EP 3713376B1
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EP
European Patent Office
Prior art keywords
current
voltage
signal
representing signal
led driver
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.)
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Application number
EP19163603.4A
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German (de)
English (en)
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EP3713376A1 (fr
Inventor
Deepak MAKWANA
Jagjitpati SHUKLA
Harald Netzer
Stefan Stark
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Tridonic GmbH and Co KG
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Tridonic GmbH and Co KG
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Priority to EP19163603.4A priority Critical patent/EP3713376B1/fr
Priority to EP20715280.2A priority patent/EP3935919A1/fr
Priority to PCT/EP2020/056545 priority patent/WO2020187669A1/fr
Publication of EP3713376A1 publication Critical patent/EP3713376A1/fr
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Publication of EP3713376B1 publication Critical patent/EP3713376B1/fr
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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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • 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 invention relates to a switched isolated LED driver with a circuitry for detecting a short circuit and an open load condition on the secondary side of an isolation stage, and to method for an isolated LED driver.
  • the first approach makes use of two separate controller (microcontroller or ASIC) pins, wherein one pin is used to evaluate the sensed output (LED) voltage e.g. to detect an open load condition when the secondary side voltage exceeds a given threshold. Another pin is used to evaluate the sensed output (LED) current.
  • the first pin utilizes a comparator to detect over voltage (open load) conditions
  • the second pin utilizes a comparator to detect over current (short circuit) conditions.
  • Fig. 1 such a situation is shown, wherein the output voltage sensing module generates the voltage signal V SNS which is given as input in a pin of a controller, while the output current sensing module generates the current signal I SNS_PK which is given as input to another pin of the controller.
  • the sensing circuity uses peak hold circuits (namely, rectifier diode and filter capacitor) the sensed voltage can follow the real output voltage very fast in positive going direction. However, it follows slow in negative going direction as it takes some time for the filter capacitor to discharge.
  • the second approach makes use of only one controller pin, wherein only the output (LED) voltage is evaluated.
  • Two comparators are used: one to detect over voltage (open load) conditions and one to detect under voltage (short circuit) conditions.
  • reaction times depend on the filtering of the sensed output voltage signal. If the sensed secondary side voltage of the LLC (output voltage) is fed to a peak hold circuit (namely, rectifier diode and filter capacitor), over voltage conditions can be detected very fast (because peak hold capacitor is charged immediately). However, under voltage (short circuit) conditions are detected delayed, because it takes some time for the peak hold capacitor to discharge. This leads to the problem that high output currents flow for several milliseconds that could probably destroy parts of the circuit.
  • a peak hold circuit namely, rectifier diode and filter capacitor
  • WO 2004/057924 A1 discloses a power supply for LEDs which provides power to a LED light source having a variable number of LEDs wired in series and/or in parallel.
  • the power supply uses current and voltage feedback to adjust power to the LEDs and provides protection to the LED light source.
  • a feedback controller compares sensed current and sensed voltage to a reference signal and generates a feedback signal, which is processed by a power factor corrector to adjust the current flow through the transformer supplying current to the LEDs.
  • a LED control switch clamps a peak of the current to the LEDs to provide further protection to the LED light source.
  • a short/open detection circuit indicates any detection of a "LED outage" of the LED light source.
  • US2015171754 discloses an isolated LLC LED driver.
  • an isolated LED driver comprises a control unit controlling at least one switch on a primary side of an isolation stage of the LED driver, means for detecting a voltage on a secondary side of the isolation stage and producing a voltage-representing signal, means for detecting a current flowing on the secondary side, and producing a current-representing signal, and means for combining the current-representing signal, with the voltage representing signal and feeding it to an input pin of the control unit.
  • this aspect of the invention allows fast detections of both over voltage and over current conditions.
  • two different signals one representative for the output voltage and one representative for the output current
  • the current representing signal is supplied to a further input of the control unit for a feedback control of an LED load current.
  • control unit is a microcontroller or an application-specific integrated circuit, ASIC.
  • the means for detecting the voltage on the secondary side of the isolation stage comprise an analog to digital converter, ADC.
  • the LED driver comprises a LLC converter, comprising an LLC transformer.
  • control unit is further configured to compare the current representing signal with a threshold value in order to derive a frequency, a duty cycle value or an actuating variable for the LLC current transformer.
  • the means for combining the current representing signal further comprises a diode for combining the current representing signal with the voltage representing signal to obtain a total signal.
  • control unit further comprises a comparator configured to compare the total signal to a threshold value and, if the total signal is higher than the threshold value, to detect a short-circuit condition or an over voltage condition.
  • the comparator is a comparator with variable reference and polarity.
  • the comparator is a comparator with single reference.
  • control unit is configured to switch off the means for combing the current representing signal in the short-circuit condition or over voltage condition.
  • a method for an isolated LED driver comprises the steps of: controlling at least one switch on a primary side of an isolation stage of the LED driver, detecting a voltage on a secondary side of the isolation stage and producing a voltage-representing signal, detecting a current flowing on the secondary side; producing a current-representing signal; combining the current-representing signal with the voltage representing signal; and feeding it to an input pin of the control unit.
  • the current representing signal is supplied to a further input of the control unit for a feedback control of an LED load current.
  • the method further comprises comparing the current representing signal with a threshold value in order to derive a frequency, a duty cycle value or an actuating variable for the LLC current transformer.
  • the aspect of the present invention might contain integrated circuits that can be readily manufactured 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.
  • FIG. 2 an exemplary embodiment of a circuit of an isolated LED driver 200 with open circuit and short-circuit at one input terminal ("pin") of a preferably integrated control circuitry in according to the invention is shown.
  • the isolated LED driver 200 comprises a control unit (not shown in Fig. 2 ) controlling at least one switch on the primary side of an isolation stage of the LED driver 200.
  • the switching of the switch determines the power supplied to a LED load and especially the LED current.
  • the LED current may be feedback-controlled back to the control circuitry by a current signal representing the LED current.
  • the control circuitry compares LED current signal with a nominal value (which may be varied for a dimming control) and controls the switching of the switch.
  • the LLC comprises a half-bridge DC/AC converter with two serially connected switches (FETs), M40, M41.
  • the half-bridge arrangement M40, M41 is fed with a DC voltage.
  • the mid-point of the switches M40, M41 is connected to a resonance capacitor C51 and the primary side winding L51a of the transformer of the LLC.
  • the primary side winding L51a of the transformer of the LLC is coupled with a secondary side winding L51b connected to a rectifier, which in the example is a diode arrangement D52a, D52b, D52c and D52d.
  • the diodes may be Schottky diodes.
  • the shown example represents a full-bridge rectifier. However, alternatively a middle-tapped rectifier may be used.
  • the output of the rectifier (diode arrangement) is fed to a capacitor C52, the DC voltage of which is applied to output terminals LED+ and LED- for supplying a LED load.
  • the primary side windings of the sensing transformers L52b, L52c are coupled with a secondary side of the sensing transformer L52a.
  • a signal ISNS_PK indicating the peak current of the LED current is generated as well as a further signal ISNS_AVG indicating the average value of the LED current.
  • Both signals ISNS_PK and ISNS_AVG can be used by the control circuitry 2 as feedback signals in order to set the clocking of the half-bridge switches M40, M41.
  • the AC component of the LED current is decoupled via a transformer L53a, L53b in order to generate a signal which may be sent to a sensing terminal OVP_SCP_PIN of the control circuitry.
  • this signal representing the decoupled AC component of this sensed LED current is thus combined with a signal produced by the circuitry 202 sensing, using a further transformer L51c, L51b, the voltage on the secondary side of the power transformer of the transformer L51a, L51b of the LLC.
  • the LED driver 200 comprises means for detecting the voltage on the secondary side of the isolation stage 202 and producing a voltage-representing signal. Furthermore, the LED driver 200 comprises means for detecting the current flowing on the secondary side 204, and especially the current through an LED load when connected at supply terminals of the LED driver, and producing a current-representing signal, means combining for a current-representing signal, optionally the decoupled AC component of the current representing signal, with the voltage representing signal and feeding it to an input pin of the control unit OVP_SCP_PIN in Fig. 2 .
  • the control unit can further be configured to compare the current representing signal with a threshold value in order to derive regulation values for the LLC current transformer, for example, a frequency, a duty cycle value or an actuating variable.
  • the control unit can be a microcontroller or an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • ADC analog-to-digital converter
  • a comparator 206 can be used to detect over voltage conditions (when the voltage at that pin rises above a certain threshold). In this embodiment, the voltage signal is generated by the LED voltage source.
  • a current pulse is generated in the signal I SNS_PK .
  • This current pulse can be transformed via current transformer to a voltage signal which can then be coupled to the voltage signal at a diode.
  • a peak occurs in this signal, which can be fed to a comparator within the controller. The comparator will detect the peak so that the controller can react to the short-circuit condition.
  • the current signal does not affect the voltage signal during normal operation (where I LED is a constant DC), but it increases the voltage signal during transients of I LED such as in the case of a short circuit of the output.
  • control unit in the short-circuit condition or over voltage condition can be configured to switch off the means for combining the current representing signal.
  • Fig. 3 shows exemplary behaviors of the current I LED and voltage V LED in the isolated LED driver 200 according to the invention.
  • V LED and I LED are combined into a single total signal and then fed to the comparator 206, as shown in figure 4 .
  • the comparator 206 can be a comparator configured to compare the total signal to a threshold value and, if the total signal is higher than the threshold value, to detect a short-circuit condition or an over voltage condition.
  • the comparator 206 can be a comparator with variable reference and polarity or a comparator with single reference.
  • the circuit shown in Fig. 4 further comprises two diodes D1 and D2, one resistance R1 and one capacitance C1.
  • the signals V LED and I LED pass through the diodes D1 and D2, respectively. Afterwards, they are combined into a single signal PA3 which is fed to the comparator 206 and then compared to the reference voltage V ref,int in order to detect an over voltage or short current condition.
  • Fig. 5 shows an exemplary implementation of an isolated LED driver 800 not forming part of the invention comprising a comparator 806.
  • an isolated LED driver 800 with open circuit and short-circuit at one pin comprises a control unit controlling at least one switch on the primary side of an isolation stage of the LED driver, means for detecting the voltage on the secondary side of the isolation stage and producing a voltage-representing signal, a comparator 806 supplied with the voltage representing signal at its non-inverted input, wherein the reference level of the comparator and, in synchronization therewith, the polarity of the comparator output signal are switched in order to produce a signal indicating, in time multiplex a LED load open circuit and short-circuit indicating signal.
  • the LED driver 800 shown in Fig. 5 comprises an LED load, whose voltage V LED is compared to a reference voltage V ref by the comparator 806. Moreover, the LED driver 800 comprises three resistors R1, R2, and R3 and two capacitors C1 and C2.
  • the comparator 806 can comprise an operational amplifier, wherein the polarity of the operational amplifier output circuit depends on the polarity of the difference between the two input voltages V LED and V ref .
  • Fig. 6 shows exemplary behaviors of the voltage V LED in an isolated LED driver not forming part of the invention as a function of time.
  • the frequency of variation is 1kHz.
  • a peak is produced in the output signal of the comparator 806 on a microcontroller.
  • Fig. 7 shows a method 1000 according to an embodiment for an isolated LED driver 200 according to an embodiment.
  • the method 1000 comprises the following steps:
  • Fig. 8 shows a further method 1100 not forming part of the invention for an isolated LED driver 800 not forming part of the invention.
  • the method 1100 comprises the following steps:

Landscapes

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

Claims (7)

  1. Pilote de DEL isolé (200), comprenant :
    - un convertisseur LLC, comprenant un transformateur de courant LLC (L51) ;
    - une unité de commande commandant au moins un commutateur sur un côté primaire d'un étage d'isolation du pilote de DEL (200),
    - un moyen pour détecter une tension sur un côté secondaire de l'étage d'isolation (202) et produire un signal représentant la tension,
    - un moyen pour détecter un courant circulant sur le côté secondaire (L52), et produire un signal représentant le courant,
    - un moyen pour combiner le signal représentant le courant avec le signal représentant la tension et l'envoyer à une broche d'entrée (OVP_SCP_PIN) de l'unité de commande,
    dans lequel le signal représentant le courant est fourni à une entrée supplémentaire (ISNS_PK, ISNS_AVG) de l'unité de commande pour une commande de rétroaction d'un courant de charge à DEL,
    dans lequel l'unité de commande est en outre configurée pour comparer le signal représentant le courant avec une valeur seuil afin de dériver une fréquence, une valeur de rapport cyclique ou une variable d'actionnement pour le transformateur de courant LLC,
    dans lequel le moyen pour combiner le signal représentant le courant comprend en outre une diode (D50) pour combiner le signal représentant le courant avec le signal représentant la tension pour obtenir un signal (PA3) total, et
    dans lequel l'unité de commande comprend en outre un comparateur (206) configuré pour comparer le signal total à une valeur seuil et, si le signal total est supérieur à la valeur seuil, pour détecter une condition de court-circuit ou une condition de surtension.
  2. Pilote de DEL isolé (200) selon la revendication 1,
    dans lequel l'unité de commande est un microcontrôleur ou un circuit intégré spécifique à une application, ASIC.
  3. Pilote de DEL isolé (200) selon l'une quelconque des revendications précédentes,
    dans lequel le moyen pour détecter la tension (202) sur le côté secondaire de l'étage d'isolation comprend un convertisseur analogique-numérique, ADC.
  4. Pilote de DEL isolé (200) selon la revendication 1,
    dans lequel le comparateur est un comparateur à référence et polarité variables.
  5. Pilote de LED isolé (200) selon la revendication 1,
    dans lequel le comparateur est un comparateur à référence unique.
  6. Pilote de DEL isolé (200) selon la revendication 1,
    dans lequel l'unité de commande est configurée pour désactiver le moyen pour combiner le signal représentant le courant dans la condition de court-circuit ou la condition de surtension.
  7. Procédé (1000) d'un pilote de DEL isolé (200), comprenant :
    - la commande (1002) d'au moins un commutateur sur un côté primaire d'un étage d'isolation du pilote de DEL (200),
    - la détection (1004) d'une tension sur un côté secondaire de l'étage d'isolation et la production d'un signal représentant la tension,
    - la détection (1006) d'un courant circulant sur le côté secondaire ;
    - la production (1008) d'un signal représentant le courant ;
    - la combinaison (1010) du signal représentant le courant avec le signal représentant la tension ; et
    - son envoi (1012) à une broche d'entrée d'une unité de commande,
    dans lequel le signal représentant le courant est fourni à une entrée supplémentaire de l'unité de commande pour une commande de rétroaction d'un courant de charge à DEL,
    dans lequel le procédé comprend en outre :
    - la comparaison du signal représentant le courant à une valeur seuil pour dériver une fréquence, une valeur de rapport cyclique ou une variable d'actionnement pour un transformateur de courant LLC d'un convertisseur LLC du pilote de DEL isolé (200) ;
    - la combinaison du signal représentant le courant avec le signal représentant la tension pour obtenir un signal total, et
    - la comparaison (206) du signal total à une valeur seuil et, si le signal total est supérieur à la valeur seuil, pour détecter une condition de court-circuit ou une condition de surtension.
EP19163603.4A 2019-03-19 2019-03-19 Détection améliorée de court-circuit de del et de charge ouverte à l'aide d'une seule broche de contrôleur Active EP3713376B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19163603.4A EP3713376B1 (fr) 2019-03-19 2019-03-19 Détection améliorée de court-circuit de del et de charge ouverte à l'aide d'une seule broche de contrôleur
EP20715280.2A EP3935919A1 (fr) 2019-03-19 2020-03-11 Court-circuit de del amélioré et détection de charge ouverte avec une seule broche de commande
PCT/EP2020/056545 WO2020187669A1 (fr) 2019-03-19 2020-03-11 Court-circuit de del amélioré et détection de charge ouverte avec une seule broche de commande

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19163603.4A EP3713376B1 (fr) 2019-03-19 2019-03-19 Détection améliorée de court-circuit de del et de charge ouverte à l'aide d'une seule broche de contrôleur

Publications (2)

Publication Number Publication Date
EP3713376A1 EP3713376A1 (fr) 2020-09-23
EP3713376B1 true EP3713376B1 (fr) 2024-02-28

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EP19163603.4A Active EP3713376B1 (fr) 2019-03-19 2019-03-19 Détection améliorée de court-circuit de del et de charge ouverte à l'aide d'une seule broche de contrôleur
EP20715280.2A Pending EP3935919A1 (fr) 2019-03-19 2020-03-11 Court-circuit de del amélioré et détection de charge ouverte avec une seule broche de commande

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EP20715280.2A Pending EP3935919A1 (fr) 2019-03-19 2020-03-11 Court-circuit de del amélioré et détection de charge ouverte avec une seule broche de commande

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WO (1) WO2020187669A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117462846B (zh) * 2023-11-28 2024-07-26 湖南壹脉通智能科技有限公司 一种头痛失眠理疗仪的控制方法、理疗仪及可读存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437994B1 (en) * 1999-09-17 2002-08-20 Koninklijke Philips Electronics, N.V. LLC converter includes a current variation detector for correcting a frequency adjusting control signal of an included difference detector
US20140160799A1 (en) * 2012-12-11 2014-06-12 Eaton Corporation Dc/dc converter with resonant converter stage and buck stage and method of controlling the same
US20150171754A1 (en) * 2013-12-18 2015-06-18 Texas Instruments Deutschland Gmbh Primary side current regulation on llc converters for led driving
WO2017137430A1 (fr) * 2016-02-12 2017-08-17 Philips Lighting Holding B.V. Convertisseurs à résonance cc/cc et correction de facteur de puissance utilisant des convertisseurs à résonance, et procédés de commande correspondants

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2964000B1 (fr) * 2002-12-19 2022-10-05 Signify Holding B.V. Pilote de del
DE102016121930A1 (de) * 2016-11-15 2018-05-17 Ledvance Gmbh Leuchtsystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437994B1 (en) * 1999-09-17 2002-08-20 Koninklijke Philips Electronics, N.V. LLC converter includes a current variation detector for correcting a frequency adjusting control signal of an included difference detector
US20140160799A1 (en) * 2012-12-11 2014-06-12 Eaton Corporation Dc/dc converter with resonant converter stage and buck stage and method of controlling the same
US20150171754A1 (en) * 2013-12-18 2015-06-18 Texas Instruments Deutschland Gmbh Primary side current regulation on llc converters for led driving
WO2017137430A1 (fr) * 2016-02-12 2017-08-17 Philips Lighting Holding B.V. Convertisseurs à résonance cc/cc et correction de facteur de puissance utilisant des convertisseurs à résonance, et procédés de commande correspondants

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EP3713376A1 (fr) 2020-09-23
EP3935919A1 (fr) 2022-01-12
WO2020187669A1 (fr) 2020-09-24

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