EP0948241A2 - Verfahren und Vorrichtung zum Betreiben von Leuchtdioden - Google Patents

Verfahren und Vorrichtung zum Betreiben von Leuchtdioden Download PDF

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Publication number
EP0948241A2
EP0948241A2 EP99660053A EP99660053A EP0948241A2 EP 0948241 A2 EP0948241 A2 EP 0948241A2 EP 99660053 A EP99660053 A EP 99660053A EP 99660053 A EP99660053 A EP 99660053A EP 0948241 A2 EP0948241 A2 EP 0948241A2
Authority
EP
European Patent Office
Prior art keywords
current
light emitting
main circuit
circuit
switching element
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.)
Withdrawn
Application number
EP99660053A
Other languages
English (en)
French (fr)
Other versions
EP0948241A3 (de
Inventor
Heikki Pienisaari
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.)
Teknoware Oy
Original Assignee
Teknoware Oy
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 Teknoware Oy filed Critical Teknoware Oy
Publication of EP0948241A2 publication Critical patent/EP0948241A2/de
Publication of EP0948241A3 publication Critical patent/EP0948241A3/de
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a method for supplying power to light emitting diodes connected to a light emitting diode matrix comprising one or more parallel connected individual light emitting diodes or a series connection thereof.
  • Light eniitting diodes are generally used in lighting fixtures, such as outdoor signs, commercial signs and the like. Connecting devices provided with a series resistor are conventionally used for operating light emitting diodes, whereby the arrangement causes unnecessary power loss. Particularly in battery-driven systems the series resistor significantly reduces the operating life as the battery capacity is limited. An example of such a battery-driven lighting system is the emergency exit lighting fixture, which should operate also when the mains voltage dies out.
  • Another conventional drawback with light emitting diodes using a series resistor is the dependence on a particular voltage level.
  • the function of a series resistor is to arrange each voltage level to suit the use of light emitting diodes, in which case the fluctuation in voltage level causes problems for the light emitting diodes regarding their durability. An incorrect voltage level may provide such a high current that despite a bias resistor the light emitting diode may be broken. A too low supply voltage, in turn, is not adequate for a light emitting diode.
  • the voltage level has a commanding effect in conventional solutions provided with a series resistor.
  • the object is achieved with a method of the invention, characterized by comprising the steps of
  • the method of the invention is based on the idea that an inductive component is connected in series with the light emitting diodes.
  • the current of the light emitting diodes is monitored, and when the current exceeds a particular suitable predetermined limit the main circuit is opened, whereby the increase of light emitting diode current stops and the current starts flowing in a current loop forced by the inductive component. Then, as the energy stored in the inductive component decreases, the current of the light emitting diodes also decreases. When the current is reduced to a predetermined value, the main circuit can be closed again.
  • the power supply method of the light emitting diodes of the invention has extremely low losses, since the use thereof does not require a series resistor for the light emitting diodes. During the use, the method can also be applied to varying voltage levels, and the method is therefore applicable to be used in demanding conditions and environments.
  • the invention also relates to a power supply apparatus of light emitting diodes comprising a light emitting diode matrix formed of one or more parallel connected individual light emitting diodes or a series connection thereof, characterized in that the power supply apparatus also comprises an inductance and a switching element, whereby a series connection of the light emitting diode matrix, the inductance and the switching element forms a main circuit of the power supply apparatus connected to a working voltage, a current monitoring block of the main circuit also arranged to control the switching element, a second current monitoring block arranged to convey a control signal to the block arranged to control the switching element, and a zero diode connected in parallel with the series connection of the inductance and the light emitting diode matrix in anti-parallel relation to the light emitting diodes of the light emitting diode matrix.
  • Figure 1 shows a circuit implementing the method of the invention comprising a light emitting diode matrix MN including N light emitting diodes connected in series and M parallel connections thereof.
  • One end of the light emitting diode matrix is connected to a positive supply voltage U in and the other end is connected to an inductive component N1.
  • the inductive component N1 is a primary winding of a transformer T1.
  • One electrode of the inductive component is further connected to a controllable switching element K1.
  • This series circuit formed of the light emitting diode matrix MN, the inductive component N1 and the switching element K1 forms a main circuit of the power supply apparatus of the invention, to which the supply voltage U in is connected.
  • the main circuit also comprises a series resistor R2.
  • Figure 1 also shows a zero diode D1 of the circuit connected in the opposite direction in parallel with the series connection of the inductive component and the light emitting diode matrix.
  • FIG. 1 also shows capacitors C1 and C2, the function of which is to operate as elements filtering and storing energy.
  • the capacitor C2 in particular stores and filters the working voltage V c of the auxiliary circuits needed in the apparatus.
  • a resistance R1 of the circuit functions as a loading resistor, through which the working voltage needed by the auxiliary circuits is at first fed.
  • the current i L x decreases linearly, whereby the amount of current in the zero diode circuit is monitored in accordance with the invention and the main circuit is closed using the switching element K1 when said current has reached a predetermined limit.
  • the predetermined limit can be defined, for example, so as to control the switch K1 when the current of the zero diode circuit dies out completely.
  • the current may increase again in the main circuit, and said method phases are repeated in order to constantly operate the light emitting diodes.
  • the current of the light emitting diode matrix forms the saw-tooth wave, shown in Figure 2, whose rising edge is the current i L and falling edge is the i L x .
  • the current of the light emitting diodes thus stays constant despite the variations in the working voltage.
  • the amount of working voltage affects only the operating frequency of the switch K1, since the current i L increases more rapidly into its peak value as the voltage U in increases, but then again the amount of working voltage does not affect the amount or fall time of the current i L x .
  • the light power produced by the light emitting diode matrix remains substantially constant irrespective of the level of the supply voltage.
  • This is particularly important when the apparatus implementing the method is battery-driven, because as the capacity of the battery decreases its terminal voltage declines.
  • a battery-driven apparatus may be, for example, an emergency exit lighting fixture, which is normally supplied by an electrical network, in which case the supply voltage of the apparatus can vary significantly.
  • a notable advantage of the method of the invention is the independence of the available light power of the supply voltage level variations.
  • the current of the main circuit is monitored from the voltage that is over a series resistor R2 connected to the current circuit.
  • Figure 1 shows how a current monitoring block A measures the voltage that is over the resistor R2.
  • the current of the main circuit reaches its peak value, then the voltage that is over the resistance R2 reaches the limit that is proportioned to the peak value of the current, and block A controls the switch K1 to open the main circuit.
  • Current information about the zero diode circuit needed to close the main circuit is obtained in accordance with the preferred embodiment presented in Figure 1 through a secondary winding N2 of a transformer T1, when a primary winding N1 of the transformer is an inductive component connected to the main circuit.
  • the winding N2 is connected to a current defining element C informing an element A arranged to control the switch K1 about the amount of current in the zero diode circuit in order to control the switch to a conducting state.
  • the switch K2 can bypass the zero diode D1, in which case the zero diode circuit and at the same time the entire dissipation power of the switch can be minimized.
  • the current starts flowing in the zero diode circuit, whereafter the switching element K2 arranged in parallel with the zero diode D1 is switched to a conducting state.
  • the amount of current is monitored as the current flows in the zero diode circuit, and as the current reaches a particular predetermined limit the switch K2 is switched from the conducting state.
  • the apparatus implementing the method comprises as an inductive component N1 a transformer T1 whose secondary winding N3 provides current informa-tion for block B controlling the switch K2, on the basis of which the switch K2 is controlled.
  • Block B changes the current information obtained from the winding to timing information, for example, using internal logic or trigger circuits.
  • the circuit according to Figure 1 also comprises a diode D2 connected to the secondary winding N2 of the transformer T1.
  • the diode aims to supply current through the winding N2 of the transformer to the capacitor C2 maintaining the working voltage V c of the auxiliary circuits of the circuit. Power is thus saved, as the supply voltage U in does not need to be used directly through a resistor R1 in order to form the working voltage.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP99660053A 1998-03-30 1999-03-25 Verfahren und Vorrichtung zum Betreiben von Leuchtdioden Withdrawn EP0948241A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI980717A FI104034B (fi) 1998-03-30 1998-03-30 Menetelmä ja laite tehon syöttämiseksi valodiodeille
FI980717 1998-03-30

Publications (2)

Publication Number Publication Date
EP0948241A2 true EP0948241A2 (de) 1999-10-06
EP0948241A3 EP0948241A3 (de) 2000-12-27

Family

ID=8551412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99660053A Withdrawn EP0948241A3 (de) 1998-03-30 1999-03-25 Verfahren und Vorrichtung zum Betreiben von Leuchtdioden

Country Status (2)

Country Link
EP (1) EP0948241A3 (de)
FI (1) FI104034B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1033903A2 (de) * 1999-01-22 2000-09-06 Nokia Mobile Phones Ltd. Elektronisches Beleuchtungsgerät und Beleuchtungsverfahren
WO2004006629A2 (de) * 2002-07-04 2004-01-15 Tridonic Optoelectronics Gmbh Stromversorgung für lumineszenzdioden
WO2004057921A1 (en) * 2002-12-19 2004-07-08 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
WO2007121798A1 (de) * 2006-04-21 2007-11-01 Tridonicatco Gmbh & Co. Kg Led-treiberschaltung
DE102008039351B3 (de) * 2008-08-22 2010-01-28 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betrieb mindestens einer Halbleiterlichtquelle
WO2010045666A1 (de) 2008-10-20 2010-04-29 Tridonicatco Gmbh & Co Kg Betriebsschaltung für leuchtdioden
WO2010046065A1 (de) * 2008-10-20 2010-04-29 Tridonicatco Schweiz Ag Betriebsschaltung für leds
US7708447B2 (en) 2002-07-04 2010-05-04 Tridonic Optoelectronics Gmbh Current supply for luminescent diodes
WO2010049074A1 (de) * 2008-10-20 2010-05-06 Tridonicatco Schweiz Ag Betriebsschaltung für leuchtdioden
WO2010124313A2 (de) 2009-04-30 2010-11-04 Tridonic Gmbh & Co Kg Betriebsschaltung für leuchtdioden
DE102009042419A1 (de) * 2009-09-21 2011-03-31 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben mindestens einer LED
WO2011113958A1 (de) * 2010-03-19 2011-09-22 Tridonic Ag Niedervolt-spannungsversorgung für ein led-beleuchtungssystem
DE102013207562A1 (de) * 2013-04-25 2014-10-30 Tridonic Gmbh & Co Kg Betriebsschaltung für LEDs mit Spannungsmessung
DE10262387B3 (de) * 2002-07-04 2016-01-21 Tridonic Ag Stromversorgung für Lumineszenzdioden
DE102006034371B4 (de) 2006-04-21 2019-01-31 Tridonic Ag Betriebsschaltung und Betriebsverfahren für Leuchtdioden

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439151A1 (de) * 1990-01-23 1991-07-31 Hughes Aircraft Company Synchronschaltsystem verwendender Leistungswandler mit hohem Wirkungsgrad
DE4022498A1 (de) * 1990-07-14 1992-01-16 Stahl R Schaltgeraete Gmbh Explosionsgeschuetzter leuchtmelder mit universalnetzteil
FR2751805A1 (fr) * 1996-07-24 1998-01-30 Schneider Electric Sa Convertisseur abaisseur a demagnetisation complete auto-oscillant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439151A1 (de) * 1990-01-23 1991-07-31 Hughes Aircraft Company Synchronschaltsystem verwendender Leistungswandler mit hohem Wirkungsgrad
DE4022498A1 (de) * 1990-07-14 1992-01-16 Stahl R Schaltgeraete Gmbh Explosionsgeschuetzter leuchtmelder mit universalnetzteil
FR2751805A1 (fr) * 1996-07-24 1998-01-30 Schneider Electric Sa Convertisseur abaisseur a demagnetisation complete auto-oscillant

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1033903A3 (de) * 1999-01-22 2004-05-06 Nokia Corporation Elektronisches Beleuchtungsgerät und Beleuchtungsverfahren
EP1033903A2 (de) * 1999-01-22 2000-09-06 Nokia Mobile Phones Ltd. Elektronisches Beleuchtungsgerät und Beleuchtungsverfahren
US7071762B2 (en) 2001-01-31 2006-07-04 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
US8063575B2 (en) 2002-07-04 2011-11-22 Tridonic Jennersdorf Gmbh Current supply for luminescent diodes
WO2004006629A3 (de) * 2002-07-04 2004-03-25 Tridonic Optoelectronics Gmbh Stromversorgung für lumineszenzdioden
US8207689B2 (en) 2002-07-04 2012-06-26 Tridonic Ag Current supply for luminescent diodes
DE10230103B4 (de) * 2002-07-04 2012-10-31 Tridonic Ag Stromversorgung für Lumineszenzdioden
EP2001269A1 (de) * 2002-07-04 2008-12-10 Ledon Lighting Jennersdorf GmbH Stromversorgung für Lumineszenzdioden
WO2004006629A2 (de) * 2002-07-04 2004-01-15 Tridonic Optoelectronics Gmbh Stromversorgung für lumineszenzdioden
EP2262347A1 (de) * 2002-07-04 2010-12-15 Ledon Lighting Jennersdorf GmbH Stromversorgung für Lumineszenzdioden
DE10262387B3 (de) * 2002-07-04 2016-01-21 Tridonic Ag Stromversorgung für Lumineszenzdioden
US7708447B2 (en) 2002-07-04 2010-05-04 Tridonic Optoelectronics Gmbh Current supply for luminescent diodes
US8698415B2 (en) 2002-07-04 2014-04-15 Tridonic Jennersdorf Gmbh Current supply for luminescent diodes
WO2004057921A1 (en) * 2002-12-19 2004-07-08 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
KR100978019B1 (ko) * 2002-12-19 2010-08-25 코닌클리케 필립스 일렉트로닉스 엔.브이. Ｌｅｄ 조명 모듈을 위한 전원 공급 조립체
CN1729722B (zh) * 2002-12-19 2010-06-09 皇家飞利浦电子股份有限公司 用于led发光模块的供电组件
DE102006034371B4 (de) 2006-04-21 2019-01-31 Tridonic Ag Betriebsschaltung und Betriebsverfahren für Leuchtdioden
EP2234240A1 (de) * 2006-04-21 2010-09-29 Tridonic GmbH & Co KG LED-Treiberschaltung
US8680778B2 (en) 2006-04-21 2014-03-25 Tridonic Atco Gmbh & Co. Kg LED driver circuit
WO2007121801A1 (de) * 2006-04-21 2007-11-01 Tridonicatco Gmbh & Co. Kg Batterieschaltung in einem notlichtgerät
WO2007121798A1 (de) * 2006-04-21 2007-11-01 Tridonicatco Gmbh & Co. Kg Led-treiberschaltung
EP2157834A2 (de) 2008-08-22 2010-02-24 Osram Gesellschaft mit Beschränkter Haftung Schaltungsanordnung zum Betrieb mindestens einer Halbleiterlichtquelle
CN101657056A (zh) * 2008-08-22 2010-02-24 奥斯兰姆有限公司 用于驱动至少一个半导体光源的电路装置
DE102008039351B3 (de) * 2008-08-22 2010-01-28 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betrieb mindestens einer Halbleiterlichtquelle
US8188678B2 (en) 2008-08-22 2012-05-29 Osram Ag Circuit arrangement for operating at least one semiconductor light source
US8525442B2 (en) 2008-10-20 2013-09-03 Tridonic Ag Operating circuit for LEDs
GB2476609B (en) * 2008-10-20 2014-02-19 Tridonic Ag Operating circuit for light diodes
DE112009002500B4 (de) 2008-10-20 2023-01-26 Tridonic Ag Betriebsschaltung für LEDs und Verfahren zum Betreiben von LEDs
DE112009002527B4 (de) 2008-10-20 2022-09-29 Tridonic Ag Betriebsschaltung für Leuchtdioden, Verfahren zum Betreiben von Leuchtdioden und LED Beleuchtungsanlage für Leuchtdioden
WO2010045666A1 (de) 2008-10-20 2010-04-29 Tridonicatco Gmbh & Co Kg Betriebsschaltung für leuchtdioden
GB2476609A (en) * 2008-10-20 2011-06-29 Tridonic Ag Operating circuit for LEDs
WO2010046065A1 (de) * 2008-10-20 2010-04-29 Tridonicatco Schweiz Ag Betriebsschaltung für leds
EP2523533A3 (de) * 2008-10-20 2013-01-23 Tridonic GmbH & Co KG Betriebsschaltung für Leuchtdioden
WO2010049074A1 (de) * 2008-10-20 2010-05-06 Tridonicatco Schweiz Ag Betriebsschaltung für leuchtdioden
US8664873B2 (en) 2009-04-30 2014-03-04 Tridonic Gmbh & Co Kg Operating circuit for light-emitting diodes
WO2010124313A2 (de) 2009-04-30 2010-11-04 Tridonic Gmbh & Co Kg Betriebsschaltung für leuchtdioden
CN102415214B (zh) * 2009-04-30 2014-12-10 赤多尼科两合股份有限公司 发光二极管的驱动电路
WO2010124313A3 (de) * 2009-04-30 2011-05-26 Tridonic Gmbh & Co Kg Betriebsschaltung für leuchtdioden
CN102415214A (zh) * 2009-04-30 2012-04-11 赤多尼科两合股份有限公司 发光二极管的驱动电路
AT508195B1 (de) * 2009-04-30 2012-03-15 Tridonic Gmbh & Co Kg Betriebsschaltung für leuchtdioden
DE102009042419B4 (de) * 2009-09-21 2011-12-15 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben mindestens einer LED
DE102009042419A1 (de) * 2009-09-21 2011-03-31 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben mindestens einer LED
WO2011113958A1 (de) * 2010-03-19 2011-09-22 Tridonic Ag Niedervolt-spannungsversorgung für ein led-beleuchtungssystem
DE102013207562A1 (de) * 2013-04-25 2014-10-30 Tridonic Gmbh & Co Kg Betriebsschaltung für LEDs mit Spannungsmessung

Also Published As

Publication number Publication date
EP0948241A3 (de) 2000-12-27
FI980717A0 (fi) 1998-03-30
FI104034B1 (fi) 1999-10-29
FI104034B (fi) 1999-10-29
FI980717A (fi) 1999-10-01

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