EP1526759A2 - Steuerungsgerät für Leuchtdioden - Google Patents

Steuerungsgerät für Leuchtdioden Download PDF

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Publication number
EP1526759A2
EP1526759A2 EP04077845A EP04077845A EP1526759A2 EP 1526759 A2 EP1526759 A2 EP 1526759A2 EP 04077845 A EP04077845 A EP 04077845A EP 04077845 A EP04077845 A EP 04077845A EP 1526759 A2 EP1526759 A2 EP 1526759A2
Authority
EP
European Patent Office
Prior art keywords
leds
ptc thermistor
overvoltages
input terminals
emitting diode
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
EP04077845A
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English (en)
French (fr)
Other versions
EP1526759A3 (de
Inventor
Edda Incerti
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.)
Immobiliare Eder Srl
Original Assignee
Immobiliare Eder Srl
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 Immobiliare Eder Srl filed Critical Immobiliare Eder Srl
Publication of EP1526759A2 publication Critical patent/EP1526759A2/de
Publication of EP1526759A3 publication Critical patent/EP1526759A3/de
Ceased legal-status Critical Current

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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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs

Definitions

  • the present invention has for its object a piloting device for the current supply of light emitting diodes (LEDs) as the basic components of solid-state lamps replacing equivalent incandescent lamps.
  • LEDs light emitting diodes
  • the purpose of the present invention is to realize a system of containment within a safe limit of the current of the LEDS for reliable operation in time thereof in the presence of high overvoltages and with the lowest possible production costs compared with those known at the state of the art and available in trade.
  • the main purpose of the present invention is to make available better functional performance towards resistance to failure for high-intensity electrical overvoltages both towards present solid state lamp models and towards the incandescent ones allowing their use in operational situations where the protection installed in the systems is inadequate or absent or where electrical system handling errors have caused anomalous voltage levels higher than the nominal ones required for operation of the lamps.
  • FIGS, 9, 20, 34, 40, 48, 56, 59, 63, 67, 13, 88 indicate the connections of the control circuit to the alternating voltage supply line typically with a lamp base (Edison) or bayonet connection.
  • the remaining circuit components are housed inside the lamp body (of which the connection represents a terminal part) generally but not exclusively through the help of a printed circuit shaped and formed so as to fit into the internal cavity of the connection and/or of an extension component integral therewith.
  • FIGS, 7, 8, 18, 19, 32, 33, 36, 37, 38, 39, 44, 45, 46, 47, 52, 53, 54, 58, 62, 66, 71, 72, 84, 85, 86, 87 indicate the LEDs connected to the control circuit and generally housed so that the primary lens installed therein directs the light flow emitted toward the outside in the useful direction or, if provided, better operation of secondary optical devices that can be plugged into or are integral with the connection and/or one of its extension components for completion of the remaining end of the lamp body.
  • reference number 6 indicates a PTC type thermistor for limiting the piloting current of LEDs 7 and 8 (of the same or different color and/or white light)
  • 1 indicates a full-wave rectifier stage consisting of the diodes 2, 3, 4, 5 which allow the functionality with alternating or direct supply voltage with either applied polarity.
  • the output of this rectifier stage is connected directly to one or more LEDs in series or parallel (in FIG 1, 7 and 8 show a circuit diagram calling for the use of two LEDs in series by way of example of one of the possible embodiments) while the input is connected to lamp connection 9 through the interposition in series of the PTC type thermistor indicated by reference number 6.
  • the device of FIG 1 allows containment of the piloting current of the LEDs at a safety level for LEDs 7 and 8, adopting a PTC thermistor device 6 whose transmissible maximum current characteristics (at thermal equilibrium, Trip Current) are lower than or equal to those tolerable for long term reliable operation of the components 7 and 8.
  • the device of FIG 1 is effective only for permanent overvoltages or those characterized by slow changes in time while it is not suitable for resisting overvoltages of a transitory nature or in any case characterized by fast changes in time.
  • This functional characteristic is due to the heating time of the PTC thermistor 6 in the presence of an overvoltage and hence an overcurrent traversing it to which it responds by opposing rise of the current beyond the trip current thereof while increasing internal resistance.
  • the electrical circuit of the device shown in FIG 2, compared with the circuit of FIG 1, calls for two added circuit components, one zener diode 16 or other device (TVS) fit to suppress voltage overvoltages, and an uncoupling resistor 17.
  • TVS zener diode 16 or other device
  • the zener diode or TVS component 16 will be sized so as to withstand the transitory and static powers resulting from the specifications of the PTC thermistor component 15 selected for use under the nominal and anomalous operating conditions expected.
  • the device of FIG 3 introduces another functional improvement in comparison with FIG 2 by replacing the uncoupling resistor 17 with a constant current electronic regulator stage 28 for the supply current of the LEDs 32 and 33.
  • This improvement consist of perfect uncoupling of the current running through the zener or TVS diode 27 and that of the LEDs 32 and 33 in case of operation in the presence of anomalous overvoltages whether transitory or permanent so that it is possible to use the LEDs 32, 33 at the highest current limit provided by their manufacturer for reliable long-term operation.
  • the steady current regulating electronic stage 28 is made up by way of example of an integrated circuit regulator of the National Semiconductor LM317 type or with equivalent functionality 29, a stabilization condenser 30 and a resistor (shunt) 31 defining the level of steady current delivered.
  • the circuit of FIG 4 is a version corresponding to that of FIG 1 as concerns the behavior under overvoltages, in which the PCT thermistor is maintained but on the contrary for reasons of an economical nature the rectifier stage is absent by virtue of the parallel connection of LEDs with opposite polarity (antiparallel) and allows, in the presence of an alternating light flux emission for each half-wave of the supply voltage in the LEDs used, greater long term reliability thereof because of the reduced effectiveness level of the current circulating in them.
  • FIG 4 shows a circuit diagram calling, with 36 and 38, for the use of two LEDs in series for one polarity group and, with 31 and 39, another two LEDs in series for the opposite polarity group by way of example of one of the possible embodiments.
  • the circuit of FIG 5 is a version corresponding to that of FIG 2 as concerns behavior under overvoltages in which for economical reasons the rectifier stage is absent by virtue of the connection of LEDs in parallel with opposite polarity (antiparallel) and allows in the presence of an alternating light flux emission for each half-wave of the supply voltage in the LEDs used a greater long term reliability thereof because of the reduced effectiveness level of the current circulating therein.
  • FIG 5 shows a circuit diagram calling with 44 and 46 for the use of two LEDs in series for one polarity group and with 45 and 47 another two LEDs in series for the opposite polarity group by way of example of one of the possible embodiments.
  • the corresponding component 42 of the circuit of FIG 5 is the 2-way TVS type or realized by means of two zener diodes connected in series but with opposite polarity.
  • the circuit of FIG 6 offers the functionalities of the circuit of FIG 5 in case the number of LEDs to be used is unequal.
  • the component 55 (zener diode with equal value or near the direct conduction voltage of the LEDs 52, 54, 53) replaces the corresponding LED 47 of FIG 5 for electrical balancing of the system.
  • the same solution is applicable to the variant of FIG 4 for replacement of the LED 39.
  • FIG 7 shows maximum circuit simplification of the variants of the present invention illustrated in FIGS 1, 2, 3, 4, 5, 6 and described above for the application ambits where it is sufficient to offer only direct supply voltage functionalities and protection from overvoltages having slow change in time with polarity coinciding with that of the supply voltage.
  • FIG 8 allows offering additional functionalities compared with those of FIG 7 in relation to protection against direct supply polarity reversal and the possibility of use with alternating supply voltage with light flux emitted for a single half-wave in addition to protection of the overvoltages with slow change in time of both polarities.
  • FIG 9 is an alternative circuit to that of FIG 8 in which the position of the rectifier diode 68 instead of being in series with the LED 66 (or series or parallel group of LEDs) is placed in parallel with opposite polarity (antiparallel) to allow better protection from reversal of polarity of the voltages applied both for supply and for overvoltage phenomena with slow change in time.
  • the diagram shown in FIG 10 adds to the functional characteristics of that of FIG 9 protection from overvoltages with fast change in time similarly to those of FIG 2 compared with FIG 1 or that of FIG 5 compared with FIG 4. It is noted that, for intrinsic operation for a single half-wave of the alternating supply voltage, the component 69 is the one-way zener or TVS diode type.
  • the diagram of FIG 11 allows modifying the circuit of FIG 5 to obtain additional functionalities analogous to the additional functionalities that the circuit of FIG 3 presents compared with the circuit of FIG 2.
  • the uncoupling resistor 43 of FIG 5 was replaced with a constant current electronic regulating stage 76 for the supply current of LEDs 84, 86, 85, 87.
  • the constant current electronic regulating stage 76 is made up by way of example of two integrated circuit regulators of the National Semiconductor LM317 type or with equivalent functionalities 78 and 81, a stabilization capacitor 80 and two resistors 79 and 82 (shunt) that define the level of constant current delivered.
  • embodiment devices will be used among which incorporation in plastic sheaths, insertion in anchoring cavities or holes on a possible printed circuit of the entire body of the component and/or other methods known in the present state of the art.
  • sizing of the PTC thermistors will be done in such a manner that the trip current figure does not cause exceeding of the maximum power that can be dissipated by the zener or TVS diodes and at the same time is appropriate for the functionalities of the LEDs used.

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  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP04077845A 2003-10-16 2004-10-15 Steuerungsgerät für Leuchtdioden Ceased EP1526759A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000098A ITRE20030098A1 (it) 2003-10-16 2003-10-16 Dispositivo di pilotaggio diodi emettitori di luce
ITRE20030098 2003-10-16

Publications (2)

Publication Number Publication Date
EP1526759A2 true EP1526759A2 (de) 2005-04-27
EP1526759A3 EP1526759A3 (de) 2007-03-28

Family

ID=34385835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04077845A Ceased EP1526759A3 (de) 2003-10-16 2004-10-15 Steuerungsgerät für Leuchtdioden

Country Status (2)

Country Link
EP (1) EP1526759A3 (de)
IT (1) ITRE20030098A1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2885271A1 (fr) * 2005-04-28 2006-11-03 Pierre Dumas Tension de gachette de regulateur reglee par diode zener
EP2150093A2 (de) 2008-07-30 2010-02-03 Piero Magnaghi LED-Lampe und Betriebsverfahren dafür
DE102008064310B3 (de) * 2008-12-20 2010-05-20 Insta Elektro Gmbh Elektrisches/elektronisches Installationsgerät
JP2010244973A (ja) * 2009-04-09 2010-10-28 Nittoh Kogaku Kk Ｌｅｄ照明装置およびｌｅｄ発光装置
EP2170013A3 (de) * 2008-09-28 2011-04-06 Wanstar Technology Co., Ltd. Hochleistungs-LED-Antriebsschaltung
WO2011073498A1 (en) * 2009-12-18 2011-06-23 Nokia Corporation Method and apparatus for driving a led with pulses
EP2356885A4 (de) * 2008-11-30 2011-09-28 Cree Inc System und verfahren zur led-wärmeverwaltung
WO2013084125A1 (en) * 2011-12-08 2013-06-13 Koninklijke Philips Electronics N.V. A module and electronic circuitry comprising a light emitting diode
WO2013095200A3 (ru) * 2011-12-16 2013-11-07 Открытое Акционерное Общество "Производственное Объединение "Уральский Оптико-Механический Завод" Имени Э.С. Яламова, (Оао "По "Уомз") Взрывобезопасный светодиодный светильник
US8643283B2 (en) 2008-11-30 2014-02-04 Cree, Inc. Electronic device including circuitry comprising open failure-susceptible components, and open failure-actuated anti-fuse pathway
EP2418919A3 (de) * 2010-08-11 2014-06-04 Samsung Electronics Co., Ltd. LED-Lampe und Antriebsschaltung dafür

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9218434U1 (de) * 1992-01-31 1994-04-21 Technology, Engineering & Marketing GmbH, 45701 Herten Leuchtvorrichtung
US5575459A (en) * 1995-04-27 1996-11-19 Uniglo Canada Inc. Light emitting diode lamp
DE19728763B4 (de) * 1997-07-07 2007-10-31 Reitter & Schefenacker Gmbh & Co. Kg Schaltungseinrichtung zum Schutz von strombetriebenen Leuchtmitteln, insbesondere von LEDs, zu Signal- oder Beleuchtungszwecken
DE10037694A1 (de) * 2000-08-02 2002-02-14 Fer Fahrzeugelektrik Gmbh Leuchtenanordnung
DE10125852A1 (de) * 2001-05-25 2002-12-05 Michael Kohls Schaltungsanordnung zum Betrieb lichtemittierender Dioden

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2885271A1 (fr) * 2005-04-28 2006-11-03 Pierre Dumas Tension de gachette de regulateur reglee par diode zener
EP2150093A2 (de) 2008-07-30 2010-02-03 Piero Magnaghi LED-Lampe und Betriebsverfahren dafür
EP2170013A3 (de) * 2008-09-28 2011-04-06 Wanstar Technology Co., Ltd. Hochleistungs-LED-Antriebsschaltung
US8643283B2 (en) 2008-11-30 2014-02-04 Cree, Inc. Electronic device including circuitry comprising open failure-susceptible components, and open failure-actuated anti-fuse pathway
EP2356885A4 (de) * 2008-11-30 2011-09-28 Cree Inc System und verfahren zur led-wärmeverwaltung
US9781803B2 (en) 2008-11-30 2017-10-03 Cree, Inc. LED thermal management system and method
DE102008064310B3 (de) * 2008-12-20 2010-05-20 Insta Elektro Gmbh Elektrisches/elektronisches Installationsgerät
JP2010244973A (ja) * 2009-04-09 2010-10-28 Nittoh Kogaku Kk Ｌｅｄ照明装置およびｌｅｄ発光装置
WO2011073498A1 (en) * 2009-12-18 2011-06-23 Nokia Corporation Method and apparatus for driving a led with pulses
US9648685B2 (en) 2009-12-18 2017-05-09 Nokia Technologies Oy Method and apparatus for driving a LED with pulses
EP2418919A3 (de) * 2010-08-11 2014-06-04 Samsung Electronics Co., Ltd. LED-Lampe und Antriebsschaltung dafür
WO2013084125A1 (en) * 2011-12-08 2013-06-13 Koninklijke Philips Electronics N.V. A module and electronic circuitry comprising a light emitting diode
WO2013095200A3 (ru) * 2011-12-16 2013-11-07 Открытое Акционерное Общество "Производственное Объединение "Уральский Оптико-Механический Завод" Имени Э.С. Яламова, (Оао "По "Уомз") Взрывобезопасный светодиодный светильник

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Publication number Publication date
ITRE20030098A1 (it) 2005-04-17
EP1526759A3 (de) 2007-03-28

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