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WO2012023653A1 - Circuit d'actionnement d'un réseau de diodes électroluminescentes - Google Patents

Circuit d'actionnement d'un réseau de diodes électroluminescentes Download PDF

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Publication number
WO2012023653A1
WO2012023653A1 PCT/KR2010/006480 KR2010006480W WO2012023653A1 WO 2012023653 A1 WO2012023653 A1 WO 2012023653A1 KR 2010006480 W KR2010006480 W KR 2010006480W WO 2012023653 A1 WO2012023653 A1 WO 2012023653A1
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WO
WIPO (PCT)
Prior art keywords
group
voltage
switch
led
led array
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Ceased
Application number
PCT/KR2010/006480
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English (en)
Korean (ko)
Inventor
양길모
김남규
김지범
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Individual
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Priority to CN201080001566.6A priority Critical patent/CN102511200B/zh
Publication of WO2012023653A1 publication Critical patent/WO2012023653A1/fr
Anticipated expiration legal-status Critical
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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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 a light emitting diode array driving circuit, and more particularly, to a light emitting device using a light emitting diode driving circuit. will be.
  • a widely used method is an LED driving method using a series resistor, which is a voltage driving method in which a current flowing through the LED is determined by an applied voltage (Vi) and a resistance (R) value connected in series with the LED.
  • the above scheme is the most widely used structure because its structure is simple, but the circuit is simple, but current control is not possible with respect to the change of the input voltage, and has the disadvantage of low power efficiency.
  • the LED driving method using an active element uses a variable voltage source or a current source to control the current flowing through the LED element.
  • the basic principle is similar to the LED driving method using a series resistor, but uses a linear method. Or adjust the voltage or current using a switching method.
  • FIG. 1 there is a current-controlled LED driving method using a series voltage control regulator.
  • the current flowing through the LED is adjusted by feeding back the voltage applied to the sensing resistor R SENSE .
  • the structure of the circuit is relatively simple and the current flowing through the LED can be adjusted relatively stably, the electrical efficiency decreases due to the voltage drop between the collector and the emitter of the transistor TR to control the current flowing through the LED. Has its drawbacks.
  • G1, G2, G3, G4 in series LED array group G1, G2, G3, G4 lights up in turn as the AC input voltage increases, and as the AC input voltage decreases, Since G4, G3, G2, and G1 are turned off in turn, the load of the LED of G1 is increased, which is an electrical stress.
  • an object of the present invention for solving the above problems is to adopt a driving scheme that changes the LED circuit connection according to the input voltage, but the LED array to turn off the LED array for each group through the voltage / current monitoring unit in the order of lighting It is to provide a driving circuit.
  • An object of the present invention is to provide a light emitting diode array driving circuit comprising: a voltage control unit controlling an increase and a decrease in an input voltage of a power source full-wave rectified through a bridge diode; A group of LED arrays in which a plurality of LED elements are connected in series to one group, and two or more n group LED arrays are also connected in series, forming a pattern such that adjacent LEDs belong to each group; An open switch connected in series to the LED arrays for each group such that the LED arrays for each group are turned on in order of connection as the voltage of the voltage controller increases; A disconnecting switch connected to the LED arrays for each group in parallel so that the LED arrays for each group are turned off in the order of lighting according to the voltage decrease of the voltage controller; And (n-1) the open switches, (n-1) the cutoff switches, and the voltage control unit, respectively, the switch control unit controlling the opening / closing operation of these switches according to the voltage increase or decrease of the voltage control unit. It is achieved by a light emitting
  • the open switch is composed of n-1 open switches to be connected in series to the LED array of each group from the first group to the (n-1) group, the voltage is supplied to the first group
  • the m-th open switch-m is 2 or more from the first open switch and (n-1) or less is turned off in order by the control command of the switch controller according to the voltage increase of the voltage supply part in the state where the LED array is lit.
  • the LED array of the (m + 1) th group corresponding to the m th open switch is turned on.
  • the cutoff switch is composed of n-1 cutoff switches to be connected in series to the LED array of each group from the first group to the (n-1) group, and the first to mth
  • the first blocking switch-l from the first blocking switch is greater than or equal to 2 and less than m is sequentially turned on by the control command of the switch controller according to the voltage decrease of the voltage supply part. It is preferable to turn off the LED group of the first group corresponding to the disconnect switch.
  • the open switch and the disconnect switch are composed of a transistor, and the switch control unit is connected to the base of the transistor, so that the conduction and insulation of the transistor by the voltage supplied from the switch control unit. desirable.
  • the LED array for each group according to a wide input voltage range is kept constant at the average power, but the light is turned off in the order of lighting by distributing the lighting time of the LED array for each group LED
  • the LED driving area can be stabilized to extend the LED lifetime.
  • 1 is a current control type LED driving circuit diagram using a conventional series voltage control regulator
  • FIG. 3 is an overall circuit diagram according to a first embodiment of the LED array driving circuit of the present invention.
  • FIG. 4 is an overall circuit diagram according to a second embodiment of the LED array driving circuit of the present invention.
  • FIG. 3 is an overall circuit diagram according to a first embodiment of the LED array driving circuit of the present invention.
  • the present invention is a power source 11, bridge diode 10, group LED array 50, open switch 60, cutoff switch 70, switch control unit 40, current limiting unit ( 20), the voltage control section 30.
  • the bridge diode 10 When the AC diode 11 is supplied and applied to the circuit, the bridge diode 10 allows the power to be full-wave rectified.
  • the voltage control unit 30 is a module for controlling the increase and decrease of the AC input voltage to transfer the voltage value to the switch control unit 40 to be described below, the current limiting unit 20 is the input current and output current This module keeps it constant.
  • the LED array 50 for each group is connected in series to a plurality of LED elements in a group and the LED array 50 for each group in series again, forming a pattern so that adjacent LEDs in each group belong to their respective groups. have.
  • the LED array 50 for each group is connected to three groups of the first group 51, the second group 52, and the third group 53, but according to an embodiment of the present invention.
  • Group LED array 50 may be connected to two or more groups.
  • the number of groups of the LED array of the present invention is at least 2 or more, and when the number of groups is n, the number of lighting of the group may be lit m of the total of n, and the number of m groups lit is 1 or more and n or less. .
  • n-1 open switches and cutoff switches respectively, depending on the off state of the m-th open switch, the LEDs of the (m + 1) group are turned on, and the m-group of all the n groups is turned on. In the first state, the LED array of the first group is turned off according to the on state of the first blocking switch.
  • the open switch 60 is a switch for lighting the LED array 50 of each group connected in series in the connection order, and the LED array of the second group 52 in the state where the LED array of the first group 51 is turned on.
  • the open switch 60 is connected in series to the LED arrays 50 and the switch controller 40 for each group, and more specifically, the first open switch 61 is connected to the first group 51. Since the first opening switch 61 is turned on and the first opening switch 61 is turned on while only the first array of LED arrays is turned on, the first opening switch 61 is turned on in series. 51 and the LED array of the second group 52 are turned on.
  • the second open switch 62 is connected to the second group 52 and the switch control unit 40 in series so that the second open switch 62 is turned on so that the first group 51 and the first open switch 62 are turned on. As the second open switch 62 is turned off while only the LED array of the second group 52 is lit, the LED array of the first group 51, the second group 52, and the second group 53 is turned on. Conduct current as much as possible.
  • the cutoff switch 70 is a switch for turning off the LED array 50 for each group connected in series in the order of lighting, and turns on the LED array of the first group 51 while the LED array 50 for each group is turned on.
  • the second blocking switch 71 for turning off the LED array of the second group 52 while the first array switch 71 for turning off the LED array of the second group 52 and the third group 53 is turned on ( 72).
  • the cutoff switch 70 is connected in parallel to the LED array 50 for each group and is connected in series to the switch control unit 40, respectively.
  • the first blocking switch 71 is connected in parallel to the first group 51 and connected in series to the switch control unit 40, and includes a state in which the LED array 50 for each group is turned on. In the state where the second group LED array abnormality is turned on, as the first blocking switch 71 is turned on, the LED array of the first group 51 is turned off.
  • the second cutoff switch 72 is connected in parallel to the second group 52 and is connected in series to the switch control unit 40, so that the first cutoff switch 71 is turned on so that the first group is turned on.
  • the LED array of the second group 52 is turned off as the second blocking switch 72 is turned on.
  • the switch controller 40 is connected to the open switch 60 and the disconnect switch 70 in series so that the open / close command is opened to control the operation of each switch according to the voltage increase or decrease of the voltage controller 30. Transfer to the switch 60 and the cut-off switch 70.
  • the power source 11 when the power source 11 is applied to the circuit according to the above circuit configuration, the power source is full-wave rectified while passing through the bridge diode 10 is transmitted to the current limiting unit 20.
  • the current limiter 20 maintains the input current and the output current to be the same with respect to the voltage increased and decreased by the voltage controller 30.
  • the voltage controller 30 transmits a corresponding voltage value to the switch controller 40, and the switch controller 40 turns on the first open switch 61 by an initial low voltage.
  • the first group 51 when the voltage is transmitted to the LED array of the first group 51, the first group 51 emits light and is transmitted to the switch controller 40 through the first open switch 61 in the ON state.
  • the switch controller 40 turns off the first open switch 61 and turns on the second open switch 62.
  • the voltage is not transmitted to the first open switch 61 by the first open switch 61 in the OFF state, and thus to the first group 51.
  • the second group 52 emits light and is transmitted to the switch controller 40 through the second open switch 62 in the ON state.
  • the switch controller 40 turns off both the first open switch 61 and the second open switch 62.
  • the voltage is not transmitted to the second open switch 61 by the first open switch 61 and the second open switch 62 in the OFF state.
  • the second group 52 and the third group 53 conduct light to emit light.
  • the switch controller 40 In the state in which all the light emitting diodes are turned on in the order of connection of the LED array 50 for each group as described above, when the voltage is reduced by the voltage controller 30, the switch controller 40 is first turned on. The first blocking switch 71 is turned on to turn off 51).
  • the voltage does not pass through the first group 51 but passes through the first shut-off switch 71 that is in an on state. It flows to the control part 40.
  • the switch controller 40 turns off the second blocking unit 72 to turn off the second group 51 after the first group 51. Turn it on.
  • the voltage does not pass through the first group 51 and the second group 52 but is in the ON state.
  • 71 and the second blocking switch 72 flows to the LED array of the third group 53 and the switch controller 40.
  • FIG. 4 is an overall circuit diagram according to a second embodiment of the LED array driving circuit of the present invention.
  • the present invention is the power source 111, bridge diode 110, LED array 150 by group, open transistor 160, blocking transistor 170, transistor control unit 140, current limiting unit ( 120, the voltage control unit 130.
  • the bridge diode 110 allows the power to be full-wave rectified.
  • the voltage controller 130 is a module for controlling the increase and decrease of the AC input voltage, and transmits a voltage value to the transistor controller 140, which will be described below.
  • the current limiter 120 provides an input current and an output current. This module keeps it constant.
  • the LED array 150 for each group is connected in series to a plurality of LED elements in a group and the LED array 150 for each group in series again, forming a pattern so that adjacent LEDs belong to each group to each group. have.
  • the LED array 150 for each group is connected to three groups of the first group 151, the second group 152, and the third group 153, but according to an embodiment of the present invention.
  • Group LED array 150 may be connected to two or more groups.
  • the open transistor 160 is an NPN transistor for lighting the LED array 150 of each group connected in series in the connection order, and the LED array of the second group 152 while the LED array of the first group 151 is turned on.
  • the second open transistor 161 for turning on the LED array of the third group 153 while the LED array of the first open transistor 161, the first group 151, and the second group 152 is turned on. 162.
  • the open transistor 160 is connected in series to the LED arrays 150 and the transistor controller 140 of each group, and more specifically, the first open transistor 161 is connected to the first group 151. It is connected in series to the emitter and is connected in series to the base of the transistor control unit 140 so that only the LED array of the first group 151 is turned on by applying a voltage to the base of the first open transistor 161 to conduct. As no voltage is applied to the base of the first open transistor 161, the LED array of the first group 51 and the second group 52 is turned on.
  • the second open transistor 162 is connected in series to the second group 152 and the transistor control unit 140, respectively, so that the second open transistor 162 is connected to the first group 151 and the first open transistor 162.
  • the LED array of the second group 152 When only the LED array of the second group 152 is turned on, when no voltage is applied to the face so that the second open transistor 162 does not conduct, the first group 151, the second group 152, and the second group The LED array of 153 is turned on.
  • the blocking transistor 170 is an NPN transistor for turning off the LED array 150 of each group connected in series in the order of lighting, and the LED array of the first group 151 while the LED array 150 of each group is turned on.
  • the second blocking transistor for turning off the LED array of the second group 152 while the LED arrays of the first group 171, the second group 152, and the third group 153 are turned off. 172.
  • the blocking transistors 170 are connected in parallel to the LED arrays 150 of each group and are connected in series to the transistor controller 140.
  • the first blocking transistor 171 has the first group 151 and the emitter connected in parallel, the transistor control unit 40 and the base are connected in series, and the first open transistor 161 and the connector. Is connected in series.
  • the voltage is supplied to the emitter of the first blocking transistor 171 so that the first group ( The LED array of 151 is turned off and the lighting state is maintained from the LED array of the second group 152 or more.
  • the second blocking transistor 172 the second group 152 and the emitter are connected in parallel, the transistor control unit 140 and the base are connected in series, and the second open transistor 162 is connected to the connector. It is connected in series.
  • the second blocking transistor 172 is turned on in the same principle, so that the LEDs of the second group 152 are turned on. Allow the array to go out.
  • the transistor control unit 140 is connected to the open transistor 160 and the blocking transistor 170 in series, respectively, so that the open transistor (or control the conduction of each transistor according to the voltage increase or decrease of the voltage control unit 130) The voltage is supplied to or disconnected from the 60 and the blocking transistor 70.
  • the power source 111 when the power source 111 is applied to the circuit according to the above circuit configuration, the power source is full-wave rectified while passing through the bridge diode 110 and transferred to the current limiting unit 120.
  • the current limiting unit 120 maintains the input current and the output current equal to the voltage increased and decreased by the voltage control unit 130.
  • the voltage controller 130 transmits a corresponding voltage value to the transistor controller 140, and the transistor controller 140 supplies a voltage to the base of the first open transistor 161 by the initial low voltage. .
  • the first group 151 when the voltage is transmitted to the LED array of the first group 151, the first group 151 emits light and the voltage flows to the transistor controller 140 through the first open transistor 161 in a conductive state.
  • the transistor controller 140 insulates the first open transistor 161 and conducts the second open transistor 162.
  • the voltage is transmitted to the LED array of the first group 151, the voltage is not transmitted to the first open transistor 161 by the first open transistor 161 in an insulated state, and thus to the first group 151.
  • the second group 152 emits light and is transferred to the transistor controller 140 through the second open transistor 162 in a conductive state.
  • the transistor controller 140 conducts both the first open transistor 161 and the second open transistor 162.
  • the voltage is transmitted to the LED array of the first group 151, the voltage is not transmitted to the second open transistor 161 by the first open transistor 161 and the second open transistor 162 in an insulated state.
  • the second group 152 and the third group 153 conduct light and emit light.
  • the transistor controller 140 when all the light emitting diodes are turned on in the order of connection of the LED array 150 for each group, when the voltage is reduced by the voltage controller 130, the transistor controller 140 is first turned on. A voltage is supplied to the emitter of the first blocking transistor 171 so that the 151 is turned off so that the 151 is turned off.
  • the LED array and the transistors of the second group 152 or more exceed the second blocking transistor 171 in the conductive state while the first open transistor 161 is in the conductive state. It flows to the control unit 140.
  • the control unit 140 supplies a voltage to the emitter of the second blocking unit 172 so that the second group 151 is turned off after the first group 151.
  • the voltage does not pass through the first group 151 and the second group 152 and is in a conductive state. It passes through the 171 and the second blocking transistor 172 flows to the LED array and the transistor control unit 140 of the third group (153).

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

Abstract

L'invention concerne un circuit d'actionnement d'un réseau de diodes électroluminescentes, qui va éteindre un réseau de DEL pour chaque groupe dans l'ordre d'allumage pendant que le réseau de DEL est maintenu à une tension moyenne, et qui va ainsi attribuer un temps d'éclairage au réseau de DEL afin que la charge sur une DEL soit uniforme, ceci de manière à stabiliser une zone d'actionnement de DEL et à rallonger la durée de vie des DEL. Le réseau de diodes électroluminescentes comprend : une unité de commande de tension qui commande l'augmentation/diminution de la tension d'entrée d'une source d'alimentation redressée en onde pleine par une diode de pont; un réseau de DEL pour chaque groupe, formant un motif tel que chaque groupe comprend des DEL à proximité du groupe, plusieurs dispositifs de DEL étant connectés en série afin de former un groupe tandis que n (2 ou plus) réseaux de DEL pour chaque groupe sont connectés en série; un commutateur d'ouverture connecté en série à chacun des réseaux de DEL pour chaque groupe de sorte que les réseaux de DEL pour chaque groupe sont allumés dans l'ordre de connexion avec l'augmentation de tension effectuée par l'unité de commande de tension; un commutateur de fermeture connecté en parallèle à chacun des réseaux de DEL pour chaque groupe de sorte que les réseaux de DEL pour chaque groupe sont éteints dans l'ordre de connexion avec la diminution de tension effectuée par l'unité de commande de tension; et une unité de commande de commutation connectée à chacun des (n-1) commutateurs d'ouverture, des (n-1) commutateurs de fermeture et de l'unité de commande de tension, et commandant les opérations d'ouverture/fermeture des commutateurs en fonction de l'augmentation/diminution de la tension par l'unité de commande de tension.
PCT/KR2010/006480 2010-08-20 2010-09-20 Circuit d'actionnement d'un réseau de diodes électroluminescentes Ceased WO2012023653A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201080001566.6A CN102511200B (zh) 2010-08-20 2010-09-20 发光二极管阵列驱动电路

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100080959A KR100995793B1 (ko) 2010-08-20 2010-08-20 발광 다이오드 어레이 구동회로
KR10-2010-0080959 2010-08-20

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WO2012023653A1 true WO2012023653A1 (fr) 2012-02-23

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JP (1) JP4848537B1 (fr)
KR (1) KR100995793B1 (fr)
CN (1) CN102511200B (fr)
WO (1) WO2012023653A1 (fr)

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JP4848537B1 (ja) 2011-12-28

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