EP4287779A1 - Procédé de fonctionnement d'un convertisseur à del et convertisseur à del - Google Patents

Procédé de fonctionnement d'un convertisseur à del et convertisseur à del Download PDF

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Publication number
EP4287779A1
EP4287779A1 EP22176366.7A EP22176366A EP4287779A1 EP 4287779 A1 EP4287779 A1 EP 4287779A1 EP 22176366 A EP22176366 A EP 22176366A EP 4287779 A1 EP4287779 A1 EP 4287779A1
Authority
EP
European Patent Office
Prior art keywords
converter
led
stage
led converter
operating
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.)
Pending
Application number
EP22176366.7A
Other languages
German (de)
English (en)
Inventor
Hans Auer
Clemens KUCERA
Fabio Romano
Lukas Saccavini
Stefan Stark
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
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 Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Priority to EP22176366.7A priority Critical patent/EP4287779A1/fr
Priority to PCT/EP2023/063881 priority patent/WO2023232576A1/fr
Publication of EP4287779A1 publication Critical patent/EP4287779A1/fr
Pending legal-status Critical Current

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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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/18—Controlling the light source by remote control via data-bus transmission
    • 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
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • 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
    • H05B47/183—
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/24—Circuit arrangements for protecting against overvoltage

Definitions

  • the present invention relates generally to the operation of light-emitting diodes (LEDs), whereby light-emitting diodes are understood to mean inorganic light-emitting diodes, but also organic light-emitting diodes (OLEDs).
  • LED will be used hereinafter as representative of both types of light-emitting devices.
  • the present invention relates to the operation of an LED converter in situations where a malfunction or abnormal behaviour has been detected.
  • the LEDs are therefore preferably operated in a mode in which the current flow through the LED is controlled. This is done using an LED converter that converts the input supply voltage into an output voltage suitable for operating the LEDs, whereby in the case of dimming operation, the current flowing through the LEDs is regulated to a certain current that depends on a corresponding input dimming signal.
  • This input dimming signal can be, for example, a control command according to the DALI standard.
  • conditions may arise that require the LED converter to the switched off to avoid a severe damage of components of the converter and/or of the LED load.
  • These conditions can relate to a fault of the supply voltage on the input side of the converter, of the LED load on the output side of the converter and/or of components of the converter itself.
  • a control unit of the converter detects such an abnormal condition and switches to converter off. In case the error remains even after a restart of the converter, the converter is completely turned off by the control unit or it switches into a standby mode in which no further light is emitted.
  • the present invention overcomes the problem that in the event of a fault, the LED converter shuts down completely and no more light is emitted from the luminaire.
  • the solution according to the invention to overcome this problem is based on the realization that under certain circumstances it is possible to operate an LED converter in a so-called safe operating mode or emergency mode, whereby operation in safe operating mode or emergency mode continues to provide light to the customer. In certain situations, it is also possible to notify the customer that there is a fault by reducing the light output. In this way, customer service is supported by fault narrowing and faster processing is made possible.
  • a method for operating an LED converter which is connected to a power supply via a mains input and to an LED light source via a load connection comprises:
  • an LED converter for operating an LED light source
  • the converter comprises a mains input connectable to a power supply and a load connection for connection to an LED light source
  • control means being adapted to:
  • the converter not simply tries to restart operation once an abnormal condition has been recognized and completely switches off in case the restart is not successful. Instead, the LED converter changes operation to a safe operating mode which allows to continue operating the light source although the abnormal condition still exists. Although the flexibility of the operation might be reduced in the safe operating mode, nevertheless operating of the LED load is still possible and therefore at least a reduced amount of a light can be generated.
  • the converter comprises a power factor correction (PFC) stage followed by a DC/DC stage, the fault condition being due to a defect of the power factor correction stage.
  • PFC power factor correction
  • DC/DC stage the DC/DC stage
  • the concept according to the invention now proposes that operation of the converter is maintained in the safe operating mode, in which safe operating mode the DC/DC stage is operated with a deactivated power factor correction stage. As will be shown in more detail later, it is indeed possible to continue operation of the converter even if a fault has occurred at the PFC stage.
  • the DC/DC stage - which is e.g. realized in the form of a resonant converter - is regulated to a set point output current which was set before the fault condition has been determined wherein preferably regulation takes place above a predetermined minimum frequency.
  • the DC/DC stage is regulated to a predetermined smallest output current.
  • a third option would be that in the safe operating mode the DC/DC stage is regulated at a predetermined frequency.
  • the DC/DC stage comprises a self-resonant topology, in particular an LLC or an LCC circuit.
  • the inventive concept explained above is also usable for other converter topologies.
  • the DC/DC stage could also be formed by a non-resonant converter, e.g. a switched converter like a Buck converter, a Flyback converter...
  • a non-resonant converter e.g. a switched converter like a Buck converter, a Flyback converter.
  • the frequency other parameters like the peak current through the switch are controlled in order to operate in the safe operating mode.
  • different peak current levels must be considered.
  • a fault or abnormal condition also can occur in case an input voltage supplied to the converter drops below a nominal voltage.
  • the converter preferably switches to a safe operating mode wherein the converter is operated at this safe operating mode at a predetermined reduced load, in particular at a predetermined minimum dimming level.
  • This operation allows to continue operating the LEDs although the input voltage does no longer satisfy the predetermined requirements. Again, in this case of an inventive safe operating mode the light output of the LED load changes to a reduced light output which again can be used to signal to the costumer that an abnormal condition has occurred.
  • Another situation where an error condition can occur is when an error is detected in the LED load. This does not necessarily mean that the LEDs themselves are damaged. However, although the LEDs are still capable of producing light, a fault in the LED load can lead to a situation where the output voltage becomes higher than a specified safety threshold. In this case, the LED converter can again switch to the safe operating mode according to the invention, in which the converter is now regulated to a predetermined lowest output current that ensures that the output voltage is well below a safety threshold.
  • the converter can - in a first step - try to restart once an abnormal condition has been detected.
  • the switch to the inventive safe operating mode then only occurs in case also the restart was not successful, i.e. the abnormal condition remains.
  • the present invention it is possible to continue to emit light despite an abnormal condition. Furthermore, if the safe operating mode according to the invention results in reduced light output, the customer is indirectly informed of a malfunction so that he can take steps to correct the problems. Nevertheless, the lamp is not completely switched off, but at least a reduced illuminance remains.
  • Figure 1 shows a block diagram illustration of a lighting system 100 comprising an LED converter 1 operating an LED light source 50.
  • the converter 1 can be connected to a physical communication line or to a wireless communication system via a communication interface in order to receive dimming commands and/or to output or exchange status information.
  • communication takes place using the known DALI-standard.
  • the shown LED converter 1 is connected to a power supply - not shown - via a mains input 10 and to the LED light source 50 via a load connection 30. Also not shown in the figures, converter 1 usually has a rectifier following the mains input 10 for rectifying a supply voltage, for example, the power supply system voltage. The rectified supply voltage is then forwarded to a power factor correction (PFC) stage 15 which provides an output voltage for components of the converter 1 that are connected downstream. The output voltage provided by the power factor correction stage 15 is usually designated as a bus voltage V bus .
  • the converter 1 typically includes EMI filter components and other filtering/protection circuitry against bursts/surges, which are not shown in figure 1 for reasons of clarity.
  • DC/DC stage 18 which may be implemented as an LLC resonant converter (or LCC resonant converter).
  • LLC resonant converter or LCC resonant converter
  • other converter topologies could be used for the DC/DC stage 18.
  • the DC/DC stage 18 controls the power provided at the load terminal 30 such that the LEDs of the light source 50 are operated at an intended forward voltage, the current provided to the LED light source 50 corresponding to a desired light output.
  • the operation of the PFC stage 15 and the DC/DC stage 18 is controlled by one or more corresponding control units, which in the present case are implemented by a combination of an ASIC 21 and a microcontroller 22.
  • the DALI commands received via the corresponding interface 25 are forwarded via optocoupler 26 to the microcontroller 22, which then controls the operation of the converter 1 so that the current supplied to the LED light source 50 corresponds to the desired dimming value.
  • a converter switches to a standby mode (STANDBY) according to the state of the art, i.e. the operation of the LED load is completely switched off. No further light is emitted and the customer only recognizes that operation has been stopped for unknown reasons. However, it is not possible for the customer to determine the reason for the shutdown without a detailed analysis of the entire system, e.g. with a device analyser.
  • STANDBY standby mode
  • the present invention overcomes this problem by amending the behaviour of the converter as shown in figure 3 .
  • the converter according to the present invention in a first step switches off in case an abnormal condition has been detected. The converter then tries to restart in order to begin again normal operation.
  • the present invention solves the problem that in the event of a fault of the lighting system, the LED converter switches off and there is no more light emitted by a luminaire. Based on the inventive solution, it is possible to still operate the LED converter in the safe operating mode and to still provide a light to a costumer. Operation of the converter is thus significantly improved compared to solutions known in the prior art.
  • FIG. 4 schematically shows a simplified structure of a boost PFC circuit wherein in particular the resistors R or the switch M can break in response to the problems mentioned above.
  • Figure 5 shows how the transfer ratio of a LLC topology circuit changes when the input voltage V bus decreases from 405V (corresponding to an active PFC stage) to 320V (corresponding to a double rectified line voltage with deactivated PFC stage).
  • the figure shows that at a constant switching frequency (fo) the LLC gain and therefore also the output current I LED decreases.
  • figure 5 also shows that even with deactivated PFC stage, the DC/DC stage 18 still can be operated in order to supply a suitable supply voltage and a suitable current to the LED load in order to maintain operation of the light source.
  • the inventive concept of maintaining operation of the power source DC/DC stage 18 in a safe operating mode in case the PFC stage 15 has been deactivated or is damaged is also usable for other converter topologies.
  • the DC/DC stage could also be formed by a non-resonant converter, e.g. a switched converter like a Buck converter, a Flyback converter, other synchronous converter topologies or hybrid solutions as also these converter types are able to handle a reduced input voltage at least to a certain extent.
  • other parameters such as e.g. peak current through the switch may then be controlled instead of frequency in order to operate in the safe operating mode.
  • a safe operation mode is suggested which allows to continue the operation of the converter 1 even in case of such an brown out voltage.
  • the load can be set to a minimum by operating the LED light source 50 at a minimum dimming level.
  • This change in operation has the consequence that the DC/DC stage 18 no longer needs so much energy from the PFC stage 15 resulting in the effect that the voltage ripple of the bus voltage is significantly reduced. This is shown in figure 7 .
  • an under voltage can no longer occur and thus a shutdown of the LED converter 1 in view of a detected under voltage by the PFC stage 15 is prevented.
  • a third situation for an abnormal condition is an error in the load.
  • SELV LED converters must prevent output voltages higher than 60V under all circumstances. For this reason, the maximum output voltage of an SELV LED converter is often limited to 54V.
  • I LED 50% I LED,max
  • the present invention allows the LED converter to operate in a certain safe mode that ensures continued light emission in a luminaire despite a fault at the power input, at the load, or even a faulty boost PFC.
  • the customer is provided with light even if abnormal operation occurs, which normally results in a complete shutdown of the luminaire.
  • the customer is also indirectly informed of a malfunction. This information can be used by the customer to more quickly isolate possible faults together with a customer support team.
EP22176366.7A 2022-05-31 2022-05-31 Procédé de fonctionnement d'un convertisseur à del et convertisseur à del Pending EP4287779A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22176366.7A EP4287779A1 (fr) 2022-05-31 2022-05-31 Procédé de fonctionnement d'un convertisseur à del et convertisseur à del
PCT/EP2023/063881 WO2023232576A1 (fr) 2022-05-31 2023-05-24 Procédé de fonctionnement d'un convertisseur à del et convertisseur à del

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22176366.7A EP4287779A1 (fr) 2022-05-31 2022-05-31 Procédé de fonctionnement d'un convertisseur à del et convertisseur à del

Publications (1)

Publication Number Publication Date
EP4287779A1 true EP4287779A1 (fr) 2023-12-06

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Family Applications (1)

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EP22176366.7A Pending EP4287779A1 (fr) 2022-05-31 2022-05-31 Procédé de fonctionnement d'un convertisseur à del et convertisseur à del

Country Status (2)

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EP (1) EP4287779A1 (fr)
WO (1) WO2023232576A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100202169A1 (en) * 2009-02-12 2010-08-12 Polar Semiconductor, Inc. Protection and clamp circuit for power factor correction controller
DE102012017397A1 (de) * 2012-04-13 2013-10-17 Tridonic Gmbh & Co. Kg Verfahren zum Regeln einer Leistungsfaktorkorrekturschaltung, Leistungsfaktorkorrekturschaltung und Betriebsgerät für ein Leuchtmittel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010035168A1 (fr) * 2008-09-23 2010-04-01 Koninklijke Philips Electronics, N.V. Régulateur limiteur de courant pour pilote de led à remise automatique à l’état initial
CN103270813B (zh) * 2010-12-21 2016-04-06 皇家飞利浦电子股份有限公司 用于限制灯驱动器中的电流过冲和欠冲的方法和装置
US8975825B2 (en) * 2012-05-08 2015-03-10 Cree, Inc. Light emitting diode driver with isolated control circuits

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100202169A1 (en) * 2009-02-12 2010-08-12 Polar Semiconductor, Inc. Protection and clamp circuit for power factor correction controller
DE102012017397A1 (de) * 2012-04-13 2013-10-17 Tridonic Gmbh & Co. Kg Verfahren zum Regeln einer Leistungsfaktorkorrekturschaltung, Leistungsfaktorkorrekturschaltung und Betriebsgerät für ein Leuchtmittel

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Publication number Publication date
WO2023232576A1 (fr) 2023-12-07

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