WO2013137678A1 - Dispositif d'excitation pour un dispositif d'émission de lumière - Google Patents

Dispositif d'excitation pour un dispositif d'émission de lumière Download PDF

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Publication number
WO2013137678A1
WO2013137678A1 PCT/KR2013/002096 KR2013002096W WO2013137678A1 WO 2013137678 A1 WO2013137678 A1 WO 2013137678A1 KR 2013002096 W KR2013002096 W KR 2013002096W WO 2013137678 A1 WO2013137678 A1 WO 2013137678A1
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WO
WIPO (PCT)
Prior art keywords
light emitting
driving voltage
emitting device
capacitor
diode
Prior art date
Application number
PCT/KR2013/002096
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English (en)
Korean (ko)
Inventor
이정훈
이성진
이종국
최재영
Original Assignee
서울반도체 주식회사
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.)
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Publication date
Application filed by 서울반도체 주식회사 filed Critical 서울반도체 주식회사
Publication of WO2013137678A1 publication Critical patent/WO2013137678A1/fr

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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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • 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
    • 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
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • 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 element driving apparatus, and more particularly to a light emitting element driving apparatus driven by an AC voltage.
  • incandescent lamps or fluorescent lamps are widely used as indoor or outdoor lighting lamps, and these incandescent lamps or fluorescent lamps have a short life and have a problem of frequent replacement.
  • a lighting apparatus using light emitting diodes having excellent controllability, fast response speed, high electro-optical conversion efficiency, long life, low power consumption and high luminance has been developed.
  • the light emitting diode Since the light emitting diode is usually driven at a small current of several tens of mA, when the light emitting diode is directly connected to an AC voltage, the current is not limited because the current is not limited. There was a problem that is easily broken. Therefore, an AC / DC converter for converting an AC voltage into a low DC voltage or the like is used, or a circuit for limiting current using a rectifier circuit and a resistor is used.
  • FIG. 1 is a circuit diagram showing a light emitting device driving apparatus according to the prior art.
  • a conventional light emitting device driving apparatus includes a rectifier 10, a capacitor C1, and a resistor R1.
  • the rectifier 10 receives an AC voltage Vac and rectifies and outputs it.
  • the capacitor C1 charges and discharges the voltage output from the rectifier 10.
  • the resistor R1 restricts the magnitude of the current corresponding to the voltage output from the rectifier 10 and the voltage Vc charged in the capacitor C1 and supplies it to the light emitting diode L1.
  • FIG. 2 is a waveform diagram illustrating an operation of a light emitting device driving apparatus according to the prior art.
  • the AC voltage Vac is full-wave rectified through the rectifier 10 and output.
  • the voltage output from the rectifier 10 becomes equal to or greater than the forward voltage Vf of the light emitting diode L1
  • a current Iled flows through the resistor R1 through the light emitting diode L1.
  • the voltage Vc starts to be charged across the capacitor C1.
  • the capacitor C1 is charged with the voltage Vc from the time when the AC voltage Vac becomes equal to or greater than the forward voltage Vf of the light emitting diode L1, and the voltage Vc from the time when the AC voltage Vac falls. ) Is discharged.
  • the waveform of the input current Iin is distorted, thereby degrading power factor and total harmonic distortion.
  • the ripple of the current Iled flowing in the light emitting diode L1 is large, so that the flicker phenomenon of the light emitting diode L1 is severely seen.
  • the capacitor C1 uses an electrolyte capacitor having a capacity of several tens of ⁇ F, the size of the circuit is increased and the life of the circuit is shortened due to the life of the electrolyte capacitor.
  • An object of the present invention is to improve the power factor, total harmonic distortion and power efficiency of a light emitting device driving apparatus for driving a light emitting diode using an AC voltage.
  • an object of the present invention is to make the current driving the light emitting device as close to the direct current as possible to suppress the flicker of the light emitting device using a small capacity capacitor for the ripple filter.
  • the present invention includes a filter unit for receiving an AC voltage to remove noise and output it; A rectifying unit rectifying the output of the filter unit to output a driving voltage; A compensator which removes noise of an input current corresponding to the AC voltage and compensates the magnitude of the driving voltage and transmits the magnitude of the driving voltage to the light emitting device; And a constant current unit for maintaining a constant current flowing through the light emitting device.
  • the compensation unit compensates the rising and falling slope of the input current flowing through the filter unit, the compensation unit to charge and discharge the driving voltage to compensate for the light emitting period of the light emitting device, the compensation unit of the light emitting device It characterized in that to remove the turn off period.
  • the filter unit may include a low pass filter, and the AC voltage may be input through first and second AC input terminals, and the filter unit may include first and second connected to the first and second AC input terminals, respectively. resistance; And a first capacitor connected between the first and second resistors.
  • the driving voltage may be output through first and second driving voltage output terminals, and the rectifying unit may include a cathode terminal connected to the first driving voltage output terminal and an anode terminal connected to one end of the first capacitor.
  • the compensation unit may include at least one charge / discharge device connected between the first and second driving voltage output terminals.
  • the compensator includes a second capacitor including one end connected to the second driving voltage output terminal and the other end connected to a node to which an anode terminal of the second diode and a cathode terminal of the fourth diode are commonly connected; And a third capacitor including one end connected to the node and the other end connected to the second driving voltage output terminal.
  • the constant current unit may include a constant current diode connected to the light emitting device, and the constant current unit further includes a current compensation device configured to compensate for a current flowing through the light emitting device to have a current component having a phase angle equal to the driving voltage.
  • the current compensating device may include a resistor connected in parallel with the constant current device.
  • the present invention provides the effect of improving the power factor, total harmonic distortion and power efficiency.
  • the present invention provides an effect of suppressing the flicker of the light emitting device by using a capacitor for a small capacity ripple filter and improving the LED lifetime by lowering the peak value of the current driving the light emitting diode.
  • the present invention provides the effect of miniaturizing the light emitting device driving apparatus by driving the light emitting device at a constant current without using a switching power supply circuit or a complex feedback constant current control circuit.
  • FIG. 1 is a circuit diagram showing a light emitting device driving apparatus according to the prior art.
  • Figure 2 is a waveform diagram for explaining the problem of the light emitting device driving apparatus according to the prior art.
  • FIG. 3 is a circuit diagram showing a light emitting device driving apparatus according to an embodiment of the present invention.
  • FIG. 4 is a waveform diagram illustrating an operation of a light emitting device driving apparatus according to an embodiment of the present invention.
  • FIG. 5 is a circuit diagram showing a light emitting device driving apparatus according to another embodiment of the present invention.
  • FIG. 6 is a waveform diagram illustrating an operation of a light emitting device driving apparatus according to another exemplary embodiment of the present invention.
  • FIG. 3 is a circuit diagram illustrating a light emitting device driving apparatus according to an embodiment of the present invention.
  • the light emitting device driving apparatus 100 of the present invention includes a filter unit 110, a rectifying unit 120, a compensating unit 130, and a constant current unit 140.
  • the filter unit 110 receives the AC voltage Vac through the first AC input terminal A1 and the second AC input terminal A2, removes the noise, and outputs the noise.
  • the second AC input terminal A2 is connected to the ground terminal GND.
  • the filter unit 110 includes a first resistor R11, a second resistor R12, and a first capacitor C11.
  • the first resistor R11 is connected between the first AC input terminal A1 and one end of the first capacitor C11
  • the second resistor R12 is the second AC input terminal A2 and the capacitor C11. It is connected between the other ends of.
  • the first and second resistors R11 and R12 preferably have a size of several hundred ⁇ .
  • the first and second resistors R11 and R12 and the first capacitor C11 may constitute a low pass filter (LPF).
  • the first and second resistors R11 and R12 and the second and third capacitors C12 and C13 may be configured to remove ripples of the input current Iin. This will be described in detail below.
  • the rectifier 120 receives the AC voltage Vac through the filter 110 and rectifies the rectifier 120 to output the driving voltage Vrec through the first and second driving voltage output terminals B1 and B2.
  • the rectifier 120 includes a full-wave rectifier circuit composed of the first to fourth diodes D1 to D4.
  • the first diode D1 includes a cathode terminal connected to the first driving voltage output terminal B1 and an anode terminal connected to one end of the first capacitor C11.
  • the second diode D2 includes a cathode terminal connected to the first driving voltage output terminal B1 and an anode terminal connected to the other end of the first capacitor C11.
  • the third diode D3 includes a cathode terminal connected to one end of the first capacitor C11 and an anode terminal connected to the second driving voltage output terminal B2.
  • the fourth diode D4 includes a cathode terminal connected to the other end of the first capacitor C11 and an anode terminal connected to the second driving voltage output terminal B2.
  • the compensator 130 compensates for the light emission period of the light emitting device L11 by charging and discharging the driving voltage Vrec.
  • the compensation unit 130 compensates for the rising and falling slope of the input current Iin flowing through the filter unit 110 to mitigate the ripple of the input current Iin.
  • the compensator 130 includes second and third capacitors C12 and C13.
  • the second capacitor C12 has a node N1 in which one end connected to the second driving voltage output terminal B1 and the anode terminal of the second diode D2 and the cathode terminal of the fourth diode D4 are commonly connected. It includes the other end connected to.
  • the third capacitor C13 includes one end connected to the node N1 and the other end connected to the second driving voltage output terminal B2.
  • the second and third capacitors C12 and C13 are preferably configured of a multilayer ceramic capacitor (MLCC) having a size of several ⁇ F.
  • MLCC multilayer ceramic capacitor
  • the lifetime is less limited than that of the conventional electrolyte capacitor, and the circuit can be miniaturized.
  • the case in which the compensator 130 includes two capacitors has been described as an example.
  • the present invention is not limited thereto, and the first and second driving voltage output terminals B1 and B2 are not limited thereto. One capacitor connected between them can be used.
  • the constant current unit 140 controls the current Iled to flow through the light emitting device L11.
  • the constant current unit 140 includes a constant current element J1 and a third resistor R13.
  • the constant current device J1 includes an anode terminal connected to the light emitting element L11 in series and a cathode terminal connected to one end of the third resistor R13.
  • the constant current device J1 according to the embodiment of the present invention includes a constant current diode (CRD).
  • the constant current diode has a characteristic of supplying a constant current in response to a change in input voltage, temperature, and the like, and does not require a separate switching element, so that a circuit can be easily configured.
  • the embodiment of the present invention is not limited thereto, and the constant current device J1 may be configured by using another device such as a FET.
  • the other end of the third resistor R13 is connected to the second driving voltage output terminal B2.
  • the third resistor R13 limits the magnitude of the voltage across the constant current device J1 so that the constant current device J1 operates stably.
  • the present invention is not limited thereto, and a diode may be used instead of the third resistor R13, and the third resistor R13 may be omitted.
  • the light emitting device L11 illustrated in FIG. 3 includes a light emitting diode, and only one light emitting diode is illustrated for convenience of description.
  • the present invention is not limited thereto, and the number of light emitting diodes may be changed.
  • the light emitting diodes of may be connected in series or in parallel.
  • the light emitting diode L11 according to the embodiment of the present invention is preferably a white light emitting diode.
  • the present invention is not limited thereto and may include a light emitting diode that emits red, blue, green, yellow, and the like instead of white.
  • FIG. 4 is a waveform diagram illustrating an operation of a light emitting device driving apparatus according to an embodiment of the present invention.
  • FIG. 4A illustrates second and third voltages such that the voltage when the second and third capacitors C12 and C13 shown in FIG. 3 is charged is greater than the forward voltage Vf of the light emitting element L11. The case where the capacitance of the capacitors C12 and C13 is selected is shown.
  • (B) shows that the voltage when the second and third capacitors C12 and C13 are charged is the forward voltage of the light emitting element L11. The case where the capacitances of the second and third capacitors C12 and C13 are selected to be smaller than Vf) is shown.
  • the AC voltage Vac is input to the filter unit 110 through the first AC input terminal A1 and the second AC input terminal A2.
  • the AC voltage Vac is output after the high frequency component is removed through the first resistor R11 and the first capacitor C11 during the half period of the positive voltage of the AC voltage Vac.
  • the AC voltage Vac is rectified by the first diode D1 and the fourth diode D4, and the driving voltage Vrec is output through the first and second driving voltage output terminals B1 and B2. .
  • a constant voltage starts to be charged across the second capacitor C12.
  • the driving voltage Vrec is compensated to a magnitude higher than the effective value of the AC voltage Vac, thereby accelerating the time when the driving voltage Vrec rises above the forward voltage Vf of the light emitting element L11. That is, the period in which the driving voltage Vrec becomes equal to or higher than the forward voltage Vf of the light emitting element L11 is long, so that the turn-on period of the light emitting element L11 increases.
  • the current Iled is limited to a constant size through the constant current element J1. Then, the voltage charged across the second capacitor C12 starts to be discharged.
  • the capacitance of the second capacitor C12 is selected such that the voltage at the time of charging the second capacitor C12 is greater than the forward voltage Vf of the light emitting device L11, for example, the capacitance of the second capacitor C12 is 4.7. If ⁇ F, the current Iled flowing through the light emitting element L11 has a direct current waveform without ripple, as shown in Fig. 4A.
  • the capacitance of the second capacitor C12 is selected such that the voltage at the time of charging the second capacitor C12 is smaller than the forward voltage Vf of the light emitting element L11, for example, the capacitance of the second capacitor C12 is 2.2. If ⁇ F, the current Iled flowing in the light emitting element L11 has a ripple component for some periods, as shown in Fig. 4B. However, even in this case, since the size of the ripple component is reduced as compared with the related art, the phenomenon that the light emitting element L11 flickers can be suppressed. In addition, since the section in which the light emitting device L11 is turned off is removed, the light emission efficiency may increase.
  • the input current Iin is the first resistor R11, the first diode D1, the second diode and the third capacitor from the first AC input terminal A1 during a half period of the positive voltage of the AC voltage Vac. (C12, 13), and flows in the direction of the second AC input terminal A2 via the fourth diode D4. That is, the input current Iin slowly rises in response to the charging of the first capacitor C12, and slowly falls in response to the discharge of the first capacitor C12 by turning on the light emitting element L11. That is, the input current Iin flows in a form similar to the waveform of the AC voltage Vac. As a result, power factor and total harmonic distortion characteristics may be improved.
  • the same operation as described above is performed even during the negative half period of the AC voltage Vac.
  • the driving voltage Vrec is compensated by the second and third capacitors C12 and C13 so that the turn-off period of the light emitting element L11 is eliminated, and the turn-on period in which ripple is suppressed increases.
  • FIG. 5 is a circuit diagram illustrating a light emitting device driving apparatus according to another exemplary embodiment of the present invention.
  • the filter unit 110, the rectifying unit 120, and the compensating unit 130 of the light emitting device driving apparatus 100_1 illustrated in FIG. 5 are the same as those shown in FIG. 3, and are illustrated with the same reference numerals. Omit.
  • the configuration of the constant current unit 140_1 of FIG. 5 further includes a current compensating element connected in parallel with the constant current element J1.
  • the current compensation device includes a fourth resistor (R14).
  • the fourth resistor R14 includes one end connected to the light emitting element L11 and the other end connected to the second driving voltage output terminal B2.
  • a current having a magnitude equal to the phase angle of the driving voltage Vrec and corresponding to the resistance value flows through the fourth resistor R14. That is, the current Iled, to which the current flowing through the constant current device J1 and the current flowing through the fourth resistor R14 is added, flows through the light emitting device L11.
  • the current flowing through the constant current element J1 may be 30 mA
  • the current flowing through the fourth resistor R14 may be 10 mA.
  • FIG. 6 is a waveform diagram illustrating an operation of a light emitting device driving apparatus according to another exemplary embodiment of the present invention.
  • the AC voltage Vac, the input current Iin, and the driving voltage Vrec shown in FIG. 6 are the same as in FIG. 4, and description thereof will be omitted.
  • the current Iled flowing through the light emitting element L11 will be described. Explain.
  • the light emitting device L11 when the driving voltage Vrec is greater than the forward voltage Vf of the light emitting device L11, the light emitting device L11 is turned on and current starts to flow. At this time, the constant current element J1 keeps the magnitude of the current constant. At the same time, current also begins to flow in the fourth resistor R14. As a result, the current Iled flowing in the light emitting element L11 includes a current component in a form similar to the driving voltage Vrec. As a result, the power efficiency of the light emitting device driving apparatus can be improved.

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

Abstract

La présente invention concerne un dispositif d'excitation pour un dispositif d'émission de lumière, lequel dispositif d'excitation comprend : une unité de filtre qui reçoit une tension alternative, et qui délivre la tension par élimination du bruit ; une unité de redressement qui redresse la sortie de l'unité de filtre, et qui délivre une tension d'excitation ; une unité de compensation qui élimine le bruit d'un courant d'entrée correspondant à la tension alternative, et qui transfère la tension d'excitation à un dispositif d'émission de lumière par compensation de la taille de la tension d'excitation; et une unité de courant constant pour maintenir de manière constante un courant circulant dans le dispositif d'émission de lumière, permettant ainsi d'améliorer un facteur d'alimentation et des caractéristiques de taux d'harmoniques, d'exciter le dispositif d'émission de lumière à l'aide d'un courant constant, et, en même temps, de réduire le papillotement.
PCT/KR2013/002096 2012-03-15 2013-03-15 Dispositif d'excitation pour un dispositif d'émission de lumière WO2013137678A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2012-0026662 2012-03-15
KR1020120026662A KR20130104800A (ko) 2012-03-15 2012-03-15 발광 소자 구동장치

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WO2013137678A1 true WO2013137678A1 (fr) 2013-09-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108541111A (zh) * 2018-05-30 2018-09-14 深圳市明微电子股份有限公司 用于led灯照明驱动的恒流输出控制电路、方法及led装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237030B1 (ko) 2014-10-22 2021-04-06 주식회사 실리콘웍스 조명 장치의 구동 회로

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020141211A1 (en) * 2001-04-02 2002-10-03 Malik Randhir Singh Adapter circuit for selectively doubling input voltage depending upon connector type
WO2011027261A1 (fr) * 2009-09-01 2011-03-10 Koninklijke Philips Electronics N.V. Système d'alimentation électrique pour charges électroniques
JP2011090901A (ja) * 2009-10-22 2011-05-06 Phoenix Electric Co Ltd 電源回路
JP2011091942A (ja) * 2009-10-22 2011-05-06 Phoenix Electric Co Ltd 電源回路
KR101073498B1 (ko) * 2011-07-04 2011-10-17 (주)우도 광고 간판용 엘이디 모듈 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020141211A1 (en) * 2001-04-02 2002-10-03 Malik Randhir Singh Adapter circuit for selectively doubling input voltage depending upon connector type
WO2011027261A1 (fr) * 2009-09-01 2011-03-10 Koninklijke Philips Electronics N.V. Système d'alimentation électrique pour charges électroniques
JP2011090901A (ja) * 2009-10-22 2011-05-06 Phoenix Electric Co Ltd 電源回路
JP2011091942A (ja) * 2009-10-22 2011-05-06 Phoenix Electric Co Ltd 電源回路
KR101073498B1 (ko) * 2011-07-04 2011-10-17 (주)우도 광고 간판용 엘이디 모듈 장치

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108541111A (zh) * 2018-05-30 2018-09-14 深圳市明微电子股份有限公司 用于led灯照明驱动的恒流输出控制电路、方法及led装置
CN108541111B (zh) * 2018-05-30 2024-04-02 深圳市明微电子股份有限公司 用于led灯照明驱动的恒流输出控制电路、方法及led装置

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