EP2014135A1 - Circuit pour diodes électroluminescentes - Google Patents

Circuit pour diodes électroluminescentes

Info

Publication number
EP2014135A1
EP2014135A1 EP07724201A EP07724201A EP2014135A1 EP 2014135 A1 EP2014135 A1 EP 2014135A1 EP 07724201 A EP07724201 A EP 07724201A EP 07724201 A EP07724201 A EP 07724201A EP 2014135 A1 EP2014135 A1 EP 2014135A1
Authority
EP
European Patent Office
Prior art keywords
switch
led
current
emitting diode
coil
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.)
Ceased
Application number
EP07724201A
Other languages
German (de)
English (en)
Inventor
Michael Zimmermann
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 AG
Original Assignee
TridonicAtco Schweiz AG
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 TridonicAtco Schweiz AG filed Critical TridonicAtco Schweiz AG
Priority to EP11159421.4A priority Critical patent/EP2334146B1/fr
Publication of EP2014135A1 publication Critical patent/EP2014135A1/fr
Ceased legal-status Critical Current

Links

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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • 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]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to methods and circuitry for operating light emitting diodes by means of switching regulators to provide the operating voltage for the LEDs.
  • the time average of the LED current can be adjusted by appropriate timing of the circuit breaker.
  • the current through the light-emitting diodes must therefore also be detected.
  • a measuring resistor (shunt) on the lower-potential side of the light emitting diode path a signal must be tapped and evaluated, which may be at a relatively high potential, for example, close to 40 volts. This alone already prevents the entire control unit including the light-emitting diode current detection can be fully integrated.
  • the present invention now aims at a technique in which the switch control, and more particularly the
  • Circuit breaker can be done until a subsequent restart without detection of the LED current. Of course, it should continue to be ensured that the diode current and thus the diode power is kept constant.
  • an operating circuit for at least one light-emitting diode which has a switching regulator.
  • the switching regulator is supplied with a DC voltage or a rectified AC voltage.
  • a supply voltage or supply current for the at least one light emitting diode is provided by means of a coil and a switch clocked by a control unit. Thisletonsström usually shows a zigzag course around a constant mean around, wherein the time average represents the RMS current through the light emitting diode path.
  • control unit determines the time duration between a switch-off and a subsequent switch-on of the switch depending on the light-emitting diode voltage and a time constant characteristic of the coil.
  • the light-emitting diode voltage can be determined, for example, on the basis of the difference between the operating voltage and the potential of the potential-low side of the light emitting diodes in the case of a Buck converter or the higher voltage side of the light emitting diodes in the case of a boost converter.
  • the coil characteristic can basically be determined on the basis of the electrical parameters of the coil.
  • the control unit can control the time constant coil Characteristic also on the rise slope of the coil current, possibly taking into account the coil voltage, the first time the switch is detected. For example.
  • the time duration can be determined until the coil current rising from zero at the first switch-on reaches a reference value. This detection has the advantage that any tolerances or manufacturing variations are automatically compensated, since the actual and current electromagnetic behavior of the coil is detected.
  • the control unit can detect the current through the switch via a measuring resistor.
  • the control unit can control switches in the form of PWM-modulated signals.
  • the control unit may set the on period, ie, the time period between turning on the power switch and immediately re-switching, by comparing the switch current with a (for example, internal) reference value of the control unit, thereby turning the switch off again when the current through the switch reaches the reference value or exceeds.
  • a (for example, internal) reference value of the control unit thereby turning the switch off again when the current through the switch reaches the reference value or exceeds.
  • the detected switch current an additional value can be applied, which is the greater the faster the rise of the switch current after a restart of the switch.
  • the switching regulator can be a boost converter or a buck converter.
  • the invention also proposes methods for operating a light-emitting diode by means of a switching regulator.
  • FIG. 1 shows a first embodiment of an operating circuit (Bück) according to the invention for light-emitting diodes
  • FIG. 3 shows signal curves as they occur in the circuit according to FIG. 1, FIG.
  • FIG. 4 shows a circuit detail for applying the switch current detection value with an additional value depending on the slew rate of the coil current (or the coil voltage).
  • the operating circuit is supplied with an input DC voltage Vi n , which of course can also be a rectified AC voltage.
  • Freewheeling diode Dl energized in the switched-on state of
  • a control and / or regulating circuit SR is provided which prescribes the timing of the switch S1, for example in the form of PWM-modulated signals, as a manipulated variable for controlling the light-emitting diode power.
  • FIG. 2 shows the drive signals Si gate, which outputs the control and / or regulating unit SR in the form of PWM-modulated signals to the control terminal of the semiconductor power switch S1.
  • the time duration between a switch-on and an immediately subsequent switch-off of the switch Sl is referred to below as t on . Accordingly, the time period between a turn-off and a subsequent turn-on of the switch is referred to as T off .
  • T off the time period between a turn-off and a subsequent turn-on of the switch.
  • the on-time t on is determined by monitoring the switch current on the basis of the voltage signal from the measuring resistor RS by the control and / or regulating unit SR after switching on the switch S1.
  • the end of the switch-on time t on is determined by the fact that the detected switch current reaches or exceeds an internal reference value U re of the control and / or regulating unit SR.
  • the current flow in the on state of the switch Sl can thus be monitored well.
  • the switch-off duration t off for the switch Sl is now determined as a function of the voltage Ui ed via the light-emitting diode path and a characteristic value k L for the inductance (inductance) L 1 that does not change over time.
  • the electromagnetic behavior of the coil Ll is determined based on the increase of the coil current when switching the switch S1 for the first time.
  • the characteristic k L is thus a function of the time duration ti and the coil voltage (during the ON cycle measurable), ie the t on time between the first time Turning on and the time at which the switch current (represented by U s ) increasing from zero reaches the internal reference value of the control and / or SR circuit SR.
  • the gate drive signal for the switch Sl is shown in the uppermost graph.
  • the switch S1 When the voltage US representing the switch current reaches the reference value U r ⁇ f , the switch S1 is again switched off (switch signal S1 to "low") .In this state, the coil current i decreases again, since the stored electromagnetic energy in the coil L1 exceeds the value After expiry of the switch-off period T off as defined above, the control and / or regulating unit SR then turns the switch on again, during a switch-on period T 0n, which in turn is determined by the current through the switch S1 shown current profile i, which zigzags around the time average by a constant mean value i eff .
  • the switch- off duration T Off can be extended in the sense of real pauses of the diode current, wherein care is taken that the switch-off times are not detectable to the human eye. In such pauses, of course, when re-switching to a magnetization of the coil, which is compensated meanwhile by the inventive control of the inductor current.
  • a particular problem may arise when the increase of the current through the coil Ll with a corresponding small inductance of the coil Ll very fast respect. the switch-off behavior in the control of the switch Sl is too slow.
  • FIG. 4 now shows a circuit-type implementation of such an application.
  • a resistance network R N is provided, which acts on the measured current value (represented by U s ) an additional value, which is tapped from the connection point of the voltage divider Rl, R2, so that the value of the application of the height of the potential at the potential lower side the light emitting diode path depends.
  • the higher this potential on the potential lower side of the light-emitting diode path relative to ground the steeper the increase of the coil current in the switched-on state of the switch S1.
  • the current measured value U s ' thus modified is supplied to a comparator in the control and / or regulating unit SR, this comparator comparing the modified current measuring value U s with an internal reference of, for example, 0.2V.
  • the output signal of the comparator in turn controls the switch-off time for the switch Sl.
  • Fig. 5 shows a modification of the circuit of Fig. 1 in that the arrangement of the inductor Ll, the free-wheeling diode Dl and the orientation of the light-emitting diode path is modified (Boost Topology).
  • the invention provides a technique in which a time average of the
  • Light-emitting diode current can be performed. Since the regulation depends on the potential on the lower-potential side of the light-emitting diode path by determining the turn-off time T Off , the control behavior automatically adjusts to a

Landscapes

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

Abstract

L'invention concerne un circuit pour au moins une diode électroluminescente (DEL) qui présente un circuit de régulation de commutation qui est alimenté en tension continue et qui fournit au moyen d'une bobine (L1) et d'un interrupteur (S1) synchronisé par une unité de commande (SR) une tension d'alimentation pour l'au moins une diode électroluminescente (DEL). Lorsque l'interrupteur (S1) est activé, une énergie est développée dans la bobine (L1) et se décharge par le biais d'au moins une diode électroluminescente (DEL) lorsque l'interrupteur (S1) est désactivé. L'unité de commande (SR) détermine la durée entre une désactivation et une activation suivante de l'interrupteur (S1) en fonction de la tension passant par au moins une diode électroluminescente (DEL) et une valeur caractéristique constante dans le temps de la bobine (L1).
EP07724201A 2006-04-21 2007-04-12 Circuit pour diodes électroluminescentes Ceased EP2014135A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11159421.4A EP2334146B1 (fr) 2006-04-21 2007-04-12 Circuit de commande pour diodes électroluminescentes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006018578 2006-04-21
DE102006034371.9A DE102006034371B4 (de) 2006-04-21 2006-07-25 Betriebsschaltung und Betriebsverfahren für Leuchtdioden
PCT/EP2007/003260 WO2007121870A1 (fr) 2006-04-21 2007-04-12 Circuit pour diodes électroluminescentes

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP11159421.4A Division EP2334146B1 (fr) 2006-04-21 2007-04-12 Circuit de commande pour diodes électroluminescentes

Publications (1)

Publication Number Publication Date
EP2014135A1 true EP2014135A1 (fr) 2009-01-14

Family

ID=38198436

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07724201A Ceased EP2014135A1 (fr) 2006-04-21 2007-04-12 Circuit pour diodes électroluminescentes
EP11159421.4A Active EP2334146B1 (fr) 2006-04-21 2007-04-12 Circuit de commande pour diodes électroluminescentes

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11159421.4A Active EP2334146B1 (fr) 2006-04-21 2007-04-12 Circuit de commande pour diodes électroluminescentes

Country Status (5)

Country Link
US (1) US8129914B2 (fr)
EP (2) EP2014135A1 (fr)
CN (1) CN101427606B (fr)
DE (1) DE102006034371B4 (fr)
WO (1) WO2007121870A1 (fr)

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US8482211B2 (en) 2008-10-22 2013-07-09 Tridonic Gmbh And Co Kg Circuit for the operation of at least one LED

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EP2347633A1 (fr) * 2008-10-20 2011-07-27 Tridonic AG Circuit de commande pour diodes électroluminescentes
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AT13981U1 (de) 2013-04-30 2015-02-15 Tridonic Gmbh & Co Kg Betriebsschaltung für Leuchtdioden
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US9137861B2 (en) 2008-10-22 2015-09-15 Tridonic Gmbh And Co Kg Circuit for the operation of at least one LED

Also Published As

Publication number Publication date
EP2334146B1 (fr) 2019-06-05
DE102006034371B4 (de) 2019-01-31
DE102006034371A1 (de) 2007-10-25
US20090273292A1 (en) 2009-11-05
CN101427606B (zh) 2010-11-10
CN101427606A (zh) 2009-05-06
US8129914B2 (en) 2012-03-06
EP2334146A2 (fr) 2011-06-15
EP2334146A3 (fr) 2012-08-01
WO2007121870A1 (fr) 2007-11-01

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