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WO2008149275A1 - Dispositif d'attaque pour attaquer une pluralité de del - Google Patents

Dispositif d'attaque pour attaquer une pluralité de del Download PDF

Info

Publication number
WO2008149275A1
WO2008149275A1 PCT/IB2008/052136 IB2008052136W WO2008149275A1 WO 2008149275 A1 WO2008149275 A1 WO 2008149275A1 IB 2008052136 W IB2008052136 W IB 2008052136W WO 2008149275 A1 WO2008149275 A1 WO 2008149275A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
led
transformer
driver circuit
inductor
Prior art date
Application number
PCT/IB2008/052136
Other languages
English (en)
Inventor
Ludwig Oostvogels
Antonius A. M. Marinus
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008149275A1 publication Critical patent/WO2008149275A1/fr

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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency AC, or with separate oscillator frequency
    • H05B41/245—Circuit arrangements in which the lamp is fed by high frequency AC, or with separate oscillator frequency for a plurality of lamps
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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]
    • 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 present invention relates in general to a driver circuit for LED arrays.
  • LEDs are replacing other types of light sources.
  • one LED is not sufficient to produce the required light output, so a lighting system needs to have a plurality of LEDs.
  • a driver which comprises a rectifying stage for rectifying mains alternating voltage, and a converter stage for converting the rectified voltage to an alternating voltage. Further, in order to reduce distortion of the mains voltage by a non-harmonic load, a power factor correction stage is required.
  • US patent application 2004/0257838 discloses a circuit having a common converter for multiple outputs.
  • a transformer has a common input winding connected in series with a switch. This series arrangement receives DC voltage, and the switch converts this to an alternating voltage over the input transformer winding.
  • the transformer has multiple secondary windings, each producing an alternating output voltage, which is subsequently rectified to produce a DC output voltage. In such an arrangement, it is difficult to assure that the output currents in all output branches are mutually equal. Further, it is difficult to implement power factor correction function with such circuit.
  • a driver circuit for multiple LEDs comprises a current transformer having a plurality of output windings producing output current.
  • a series inductor is arranged in series with the transformer primary, the series inductor having an inductance substantially larger than the inductance of the transformer primary, so that the current in the transformer primary is substantially only determined by the inductance of the series inductor.
  • figure 1 is a block diagram schematically illustrating a first embodiment of a driver circuit
  • figure 2 is a block diagram schematically illustrating a second embodiment of a driver circuit.
  • FIG. 1 is a block diagram schematically illustrating a first embodiment 100 of a driver circuit according to the present invention.
  • the circuit comprises a DC/ AC converter stage 110, having input terminals 117, 118 for receiving DC input voltage from a DC voltage source 1, and producing AC output current.
  • the converter stage 110 is implemented as a half-bridge circuit, but as an alternative it is possible to use a full- bridge circuit or any other type of circuit capable of generating a symmetrical voltage without any DC component. Since half-bridge converter circuits are known per se, an explanation of the circuit and its functioning will be kept to a minimum.
  • the converter stage 110 comprises a series arrangement of two controllable switches 111 and 112 connected between said two input terminals 117, 118, typically MOSFETs, with a first output node 113 between these two switches, said series arrangement receiving the input voltage from source 1.
  • the converter stage 110 further comprises a capacitor 114 having one terminal connected to one of the supply lines and having its other end connected to a second output node 115. Possibly, but not shown, the converter stage 110 comprises a further capacitor having one terminal connected to the other one of the supply lines and having its other end connected to said second output node 115.
  • the converter stage 110 further comprises a controller 116 for controlling the switches 111, 112 such as to be alternatively conductive and non-conductive (ON and OFF), such that the switches are never conductive simultaneously.
  • the first output node 113 alternatively carries the high voltage level and the low voltage level of the voltage source 1.
  • the capacity of the capacitor 114 is sufficiently high such that the voltage at the second output node 115 is substantially constant.
  • a square wave output voltage is generated over the output nodes 113, 115, the frequency of this square wave output voltage being determined by the (relatively high) switching frequency of the controller 116.
  • An inductor 120 is connected in series with the output nodes 113, 115. The square wave output voltage over the inductor 120 results in a triangular current through the inductor 120.
  • the driver circuit 100 comprises a plurality of mutually substantial identical LED circuits 150. If this would increase clarity, individual LED circuits will be individually distinguished by addition of an index between brackets, and the same shall apply to their components. For sake of simplicity, figure 1 only shows three LED circuits, but the number of LED circuits may easily be in the order of 100 or more.
  • Each LED circuit 150 basically comprises a current transformer 151 having a primary winding 152 and a secondary winding 153, and a rectifier 156 having its input connected to the secondary transformer winding 153.
  • the rectifier 156 may have any suitable configuration, for instance a diode bridge, as known per se.
  • An LED 159 is connected to the output of the rectifier 156.
  • the figure shows one LED 159 connected to the output of the rectifier 156, but typically a string of multiple LEDs may be connected to the output of the rectifier 156.
  • the transformer 151 will be designed to produce the required LED (string) current. This comes into expression in a certain ratio between the number of secondary turns and the number of primary turns in the secondary winding 153 and the primary winding 152, respectively.
  • the primary windings 152 of all LED circuits 150 are connected in series with each other and in series with the inductor 120 between said output nodes 113, 115. This means that all primary windings 152 receive the same current.
  • the current amplitude depends, apart from the voltage and the frequency, on the inductance value between output nodes 113, 115, i.e. the summation of the inductance of the inductor 120 and all inductances of all primary windings 152.
  • the number of primary turns in the primary winding 152 is relatively small, so that the inductance of each primary winding 152 is negligible.
  • Even the summation of all inductances of all primary windings 152 is small compared to the inductance of the inductor 120, so that the current amplitude is substantially determined by the inductance of the inductor 120 alone.
  • the load for the voltage source 1 is not affected by adding or removing a LED circuit 150, nor by variations in the forward voltage of the LEDs. It is noted that, generally, the constant voltage source 1 will itself be powered from mains, and that it must be designed properly such as to provide a correct load to mains. In the design according to the present invention, the load to mains is not influenced by the LED strings so that a separate power correction function is not required.
  • Figure 2 is a block diagram schematically illustrating a second embodiment
  • this embodiment comprises a single transformer 260 with a single primary winding 261 and a plurality of secondary windings 262.
  • the LED circuits 250 are provided with equalizer transformers.
  • equalizer transformer 270(i) having a first winding 271(i) connected in series with the secondary winding 262(i) and having a second winding 272(i) connected in series with the secondary winding 262(i+l), wherein the number of turns in the first winding 271(i) equals the number of turns in the second winding 272(i). Since the concept of equalizer transformers is known per se, a more elaborate explanation is not needed here.
  • each LED circuit 250(i) is coupled to one neighbor 250(i+l) through a first equalizer transformer 270(i) and is coupled to its other neighbor 250(i-l) through a second equalizer transformer 270(i-l).
  • first equalizer transformer 270(i) is coupled to its other neighbor 250(i-l) through a second equalizer transformer 270(i-l).
  • one circuit 150 fails to an open circuit, the voltage over the circuit may increase and/or the corresponding transformer may saturate. In order to prevent this, it is possible to implement a crowbar design that shorts the secondary winding 153 above a suitably selected threshold voltage.
  • An advantage of the first embodiment 100 is that it offers more flexibility in removing or adding a LED string.
  • An advantage of the second embodiment 200 is that it may be cheaper to implement and that, in the case of many LED strings, it is easier to obtain a low impedance.
  • a current sensor (not shown for sake of simplicity) can provide a current sense signal for the controller 116, which in response may amend the current for the LEDs, for instance by adapting its switching frequency: a higher frequency results in a lower current, and vice versa.
  • Such current sensor may be arranged in series with the primary winding(s) of the current trans former(s) between nodes 113 and 115, to sense the primary current.
  • a current sensor arranged in one of the LED circuits 150, 250
  • a separate measuring module In the case of the first embodiment 100, such current measuring module would contain the combination of at least a primary winding arranged in series with the inductor 120, a secondary winding, and a sensor sensing the current in the secondary winding, possibly after rectifying.
  • such current measuring module In the case of the second embodiment 200, such current measuring module would contain the combination of at least a secondary winding coupled to the primary winding 261, and a sensor sensing the current in the secondary winding, possibly after rectifying.
  • the present invention provides a driver circuit 100; 200 for driving a plurality of LEDs 159, which driver comprises: a series arrangement of two controllable switches 111, 112 connected between said two input terminals 117, 118; a controller 116 for alternatively and in counterphase controlling said two switches; an inductor 120 coupled to a first node 113 between said two switches; a plurality of LED circuits 150; 250, each LED circuit comprising at least one LED and a secondary transformer winding 153; 262, and a rectifying circuit 156 arranged between said secondary transformer winding and said LED; transformer means 151; 260 comprising at least one winding 152; 261 arranged in series with said inductor 120, said transformer means being designed for coupling current from said inductor 120 to said secondary transformer windings 153; 262; wherein the inductivity of said at least one winding 152; 261 is smaller than the inductivity of said inductor 120.
  • the voltage source 1 provides a rectified AC voltage, having a frequency (for instance 50 HZ or 60 Hz) much lower than the switching frequency of the controller 116, so that, on the time scale of the switching period of the switches 111, 112, the input voltage may be considered constant. With such alternating input voltage, the current magnitude in the inductor 120 will also be alternating.
  • circuit can easily be applied to use mains-isolation.
  • circuit can also be used to provide the power factor correction.
  • Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims.
  • the word “comprising” does not exclude other elements or steps
  • the indefinite article “a” or “an” does not exclude a plurality.
  • a single processor or other unit may fulfill the functions of several items recited in the claims.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope.

Landscapes

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

Abstract

L'invention concerne un circuit d'attaque (100 ; 200) pour attaquer une pluralité de DEL (159), lequel circuit comprend un agencement en série de deux commutateurs commandables (111, 112) connectés entre lesdites deux bornes d'entrée (117, 118) ; un contrôleur (116) pour commander de façon alternée et en opposition de phase lesdits deux commutateurs ; une bobine d'inductance (120) couplée à un premier nœud (113) entre lesdits deux commutateurs ; une pluralité de circuits de DEL (150 ; 250), chaque circuit de DEL comprenant au moins une DEL et un enroulement de transformateur secondaire (153 ; 262), et un circuit de redressement (156) agencé entre ledit enroulement de transformateur secondaire et ladite DEL ; des moyens de transformateur (151 ; 260) comprenant au moins un enroulement (152 ; 261) agencé en série avec ladite bobine d'inductance (120), lesdits moyens de transformateur étant conçus pour coupler un courant provenant de ladite bobine d'inductance (120) auxdits enroulements de transformateur secondaires (153 ; 262) ; l'inductance dudit au moins un enroulement (152 ; 261) étant inférieure à l'inductance de ladite bobine d'inductance (120).
PCT/IB2008/052136 2007-06-06 2008-06-02 Dispositif d'attaque pour attaquer une pluralité de del WO2008149275A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07109690 2007-06-06
EP07109690.3 2007-06-06

Publications (1)

Publication Number Publication Date
WO2008149275A1 true WO2008149275A1 (fr) 2008-12-11

Family

ID=39628789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/052136 WO2008149275A1 (fr) 2007-06-06 2008-06-02 Dispositif d'attaque pour attaquer une pluralité de del

Country Status (2)

Country Link
TW (1) TW200917902A (fr)
WO (1) WO2008149275A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2237645A1 (fr) 2009-04-01 2010-10-06 Samsung Electronics Co., Ltd. Appareil d'équilibrage de courant, appareil d'alimentation électrique, appareil d'éclairage et procédé d'équilibrage de courant correspondant
WO2011101761A2 (fr) 2010-02-08 2011-08-25 Koninklijke Philips Electronics N.V. Circuit d'attaque permettant d'attaquer un circuit de charge
GB2479950A (en) * 2010-04-26 2011-11-02 Silitek Electronic LED backlight drive circuit, suitable for LCD display
EP2259275A3 (fr) * 2009-06-01 2011-12-14 Osram Gesellschaft mit Beschränkter Haftung Transformateur haute fréquence et source de courant constant à sorties multiples utilisant le transformateur haute fréquence
NL2016810B1 (en) * 2016-05-23 2017-11-30 Optimos Apto B V A method, a controller and a network

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI407833B (zh) * 2009-07-15 2013-09-01 Richtek Technology Corp 驅動電路與驅動負載的方法
KR101387022B1 (ko) * 2010-11-17 2014-04-18 니혼마키센 고교 가부시키가이샤 전원 회로

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1335477A2 (fr) * 1994-07-13 2003-08-13 Auckland Uniservices Limited Bloc d'éclairage à alimentation inductif
WO2005048658A1 (fr) * 2003-11-13 2005-05-26 Philips Intellectual Property & Standards Gmbh Circuit resonnant de commande de diodes electroluminescentes de puissance pour le reglage de la luminosite et de la saturation des couleurs
WO2006056960A1 (fr) * 2004-11-29 2006-06-01 Koninklijke Philips Electronics N.V. Procede et circuit de commande de fonctionnement d'une del
GB2426872A (en) * 2003-05-02 2006-12-06 Inductronics Technology Ltd Apparatus for supplying energy to a load and a related system
EP1788850A1 (fr) * 2005-11-22 2007-05-23 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Arrangement d'entraînement pour cellules de diodes électroluminescentes
EP1845755A2 (fr) * 2006-04-10 2007-10-17 EMD Technologies, Inc. Systèmes d'illumination

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1335477A2 (fr) * 1994-07-13 2003-08-13 Auckland Uniservices Limited Bloc d'éclairage à alimentation inductif
GB2426872A (en) * 2003-05-02 2006-12-06 Inductronics Technology Ltd Apparatus for supplying energy to a load and a related system
WO2005048658A1 (fr) * 2003-11-13 2005-05-26 Philips Intellectual Property & Standards Gmbh Circuit resonnant de commande de diodes electroluminescentes de puissance pour le reglage de la luminosite et de la saturation des couleurs
WO2006056960A1 (fr) * 2004-11-29 2006-06-01 Koninklijke Philips Electronics N.V. Procede et circuit de commande de fonctionnement d'une del
EP1788850A1 (fr) * 2005-11-22 2007-05-23 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Arrangement d'entraînement pour cellules de diodes électroluminescentes
EP1845755A2 (fr) * 2006-04-10 2007-10-17 EMD Technologies, Inc. Systèmes d'illumination

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2237645A1 (fr) 2009-04-01 2010-10-06 Samsung Electronics Co., Ltd. Appareil d'équilibrage de courant, appareil d'alimentation électrique, appareil d'éclairage et procédé d'équilibrage de courant correspondant
EP2259275A3 (fr) * 2009-06-01 2011-12-14 Osram Gesellschaft mit Beschränkter Haftung Transformateur haute fréquence et source de courant constant à sorties multiples utilisant le transformateur haute fréquence
WO2011101761A2 (fr) 2010-02-08 2011-08-25 Koninklijke Philips Electronics N.V. Circuit d'attaque permettant d'attaquer un circuit de charge
US9160241B2 (en) 2010-02-08 2015-10-13 Koninklijke Philips N.V. Driver circuit for driving a load circuit
GB2479950A (en) * 2010-04-26 2011-11-02 Silitek Electronic LED backlight drive circuit, suitable for LCD display
GB2479950B (en) * 2010-04-26 2014-08-06 Lite On Technology Corp LED backlight driving module
NL2016810B1 (en) * 2016-05-23 2017-11-30 Optimos Apto B V A method, a controller and a network
WO2017204629A1 (fr) 2016-05-23 2017-11-30 Optimos Apto B.V. Procédé, dispositif de commande et réseau

Also Published As

Publication number Publication date
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