EP2519079B1 - Feste LED-Beleuchtungsvorrichtung und Beleuchtungsbefestigung damit - Google Patents

Feste LED-Beleuchtungsvorrichtung und Beleuchtungsbefestigung damit Download PDF

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Publication number
EP2519079B1
EP2519079B1 EP12159970.8A EP12159970A EP2519079B1 EP 2519079 B1 EP2519079 B1 EP 2519079B1 EP 12159970 A EP12159970 A EP 12159970A EP 2519079 B1 EP2519079 B1 EP 2519079B1
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Prior art keywords
switching element
lighting device
current
solid light
emitting element
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Not-in-force
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EP12159970.8A
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English (en)
French (fr)
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EP2519079A1 (de
Inventor
Masahiro Naruo
Shigeru Ido
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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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
    • H05B45/37—Converter circuits

Definitions

  • the present invention relates to a solid light-emitting element lighting device and to an illumination fixture using the same.
  • the LED lighting device for supplying lighting power to an LED illumination module (for example, refer to JPT 2006-511078 and paragraphs [0015] to [0017] and Fig. 7 to Fig. 9 ).
  • the LED lighting device includes: a control switch Q3 for being turned on and off in accordance with a dual signal including a low-frequency burst of high-frequency pulse, the control switch Q3 being connected to an LED illumination module 104 in series; an inductor L2 for accumulating energy when the control switch Q3 is turned on, the inductor similarly being connected to the LED illumination module 104 in series; and a diode D2 for regenerating the energy accumulated in the inductor L2 to the LED illumination module 104 at the turning-off of the control switch Q3.
  • the above-mentioned dual signal is an AND output of a high-frequency drive pulse and a low-frequency PWM signal to the control switch Q3, an average current flowing to the LED illumination module 104 is varied by changing a duty ratio of the PWM signal, and thus a light intensity outputted from the LED illumination module 104 is changed (so-called burst dimming).
  • US 2007/0188112 A1 shows a solid light-emitting element lighting device comprising: a series circuit of an inductor and a switching element that are connected between output terminals of a direct-current power source via a load; a diode for regenerating, during turning-off of the switching element, energy accumulated during turning-on of the switching element in the inductor to the load; and a control circuit part for controlling on and off of the switching element.
  • the control circuit part includes a drive signal generation part for generating the drive signal whose pulse width varies in accordance with an amplitude of a load current.
  • the device in order to prevent an excessive current flowing through the load, the device according to US 2007/0188112 A1 further contains a blocking means that blocks a PWM signal so that the drive signal is low if the current flowing through the load exceeds a preset value when the PWM signal is high.
  • the current through the load is determined by measuring a shunt voltage that is subtracted from the high level voltage of the PWM signal and the difference is compared with a preset voltage value.
  • WO 2010/046065 A1 proposes a lighting device for an LED module.
  • a diode for regenerating, during turning-off of the switching element, energy accumulated during turning-on of the switching element in the inductor to the LED module is provided.
  • a capacitor is connected parallel with the LED module to minimize ripples of the current flowing through the LED module.
  • the switching element ist preferably switched when the current through the switching element is zero to avoid losses.
  • the high-frequency drive pulse to the control switch Q3 is the AND output including the low-frequency PWM signal, and when an edge of the above-mentioned PWM signal is inputted during the turning-on of the control switch Q3, the drive pulse to the control switch Q3 becomes Low.
  • the on-period of the control switch Q3 is changed due to the variation of the low-frequency PWM signal, and accordingly an LED current, that is, an optical output of the LED illumination module 104 varies.
  • the regeneration current of the inductor L2 flows to the LED illumination module 104 via the diode D2; however, even when the above-mentioned PWM signal varies, the LED current does not change during the period. That is, despite the variation of the PWM signal, the optical output of the LED module 104 does not change.
  • Fig. 8 is a time chart of the case where the control switch Q3 is operated in a critical mode (a mode in which the control switch Q3 is switched from being turned off to being turned on at timing when the current flowing to the inductor L2 becomes zero).
  • a critical mode a mode in which the control switch Q3 is switched from being turned off to being turned on at timing when the current flowing to the inductor L2 becomes zero.
  • a load current I1 of the LED illumination module 104 will increase by one cycle of the drive signal (the broken line in Fig. 8 ).
  • the optical output to the duty variation will be stepwise as shown in Fig. 9 .
  • the optical output difference of the one step is equivalent to the optical output of the one cycle of the high-frequency drive pulse for the control switch Q3, and accordingly the stepwise variation of the optical output can be watched.
  • the stepwise variation will be more apparent.
  • the ratio of the period where the optical output does not vary in the sweeping of the PWM signal is large, and consequently there causes a problem that the optical output appears to vary in a stepwise fashion.
  • the present invention is achieved in consideration of the above-mentioned problems, and a purpose of the present invention is to provide a solid light-emitting element lighting device and an illumination fixture using the same that are able to smoothly change the optical output in the sweeping of the PWM signal for dimming.
  • a solid light-emitting element lighting device of the present invention includes the features of claim 1.
  • control circuit part includes a zero current detection circuit for detection that a current flowing to the inductor becomes zero, and switches the switching element from being turned off to being turned on in synchronization with detection timing of the zero current detection circuit.
  • control circuit part switches the switching element to be turned on before the current flowing to the inductor during the turning-off of the switching element becomes zero.
  • the direct-current power source includes an AC-DC converter or a DC-DC converter to which a detection result of the load voltage is feed backed and that controls an output voltage to be a voltage proportional to the detection result, and includes a voltage detection part for detecting the load voltage and feed backing the load voltage to the direct-current power source.
  • the direct-current power source includes the AC-DC converter, and a frequency of the PWM signal is set to 600Hz or multiples of 600Hz.
  • An illumination fixture of the present invention includes: the solid light-emitting element lighting device according to any one of claims 1 to 5; and a solid light-emitting element to which lighting power is supplied from the solid light-emitting element lighting device.
  • Fig. 1 is a schematic circuit view showing an LED lighting device (a solid light-light emitting device lighting device) according to a first example.
  • the LED lighting device includes: a step-down chopper circuit part 2 for stepping down an output voltage of a direct-current power source 1 to a direct current of a desired voltage value; and a control circuit part 3 for controlling a switching element Q1 to be turned on and off, the switching element Q1 described later constituting the step-down chopper circuit part 2.
  • an illumination fixture according to the present example includes: the LED lighting device; and a LED module (a solid light-emitting element, a load) 4 to which lighting power is supplied from the LED lighting device.
  • the LED module 4 includes three LEDs (light-emitting diodes); however, the number of LEDs is not limited to the present example and may be one, two, four or more.
  • the step-down chopper circuit part 2 includes: a series circuit of an inductor L1 and the switching element Q1, the series circuit being connected between output terminals of the direct-current power source 1 via the LED module 4; and a diode D1 for regenerating energy during the turning-off of the switching element Q1, the energy being accumulated in the inductor L1 during the turning-on of the switching element Q1.
  • the control circuit part 3 includes: a starter 32 for outputting a start-up signal to generate a drive pulse during stopping of oscillation at regular intervals; a zero current detection circuit 31 for detecting that a current flowing to a secondary wiring N2 of the inductor L1 becomes zero; and a drive pulse generation part 34 for generating the drive pulse to turn on and off the switching element Q1.
  • the control circuit part 3 includes: a drive circuit 33 for driving the switching element Q1 in response to the drive pulse from the drive pulse generation part 34; a comparator 35 for outputting a reset signal to the drive pulse generation part 34 when a current flowing to the switching element Q1 reaches a reference value.
  • the drive pulse generation part 34 includes a RS flip-flop; to a set terminal of the RS flip-flop, an OR output of a detection signal of the zero current detection circuit 31 and the start-up signal of the starter 32 is inputted via an OR circuit 36, and an output of the drive pulse generation part 34 becomes High when the set signal is inputted.
  • the output of the drive pulse generation part 34 becomes Low when the reset signal is inputted from the comparator 35, and thus a high-frequency drive pulse where the High and Low are alternately repeated is outputted from the drive pulse generation part 34.
  • an AND output of the high-frequency drive pulse inputted from the drive pulse generation part 34 and the lower-frequency PWM signal than the drive pulse is inputted via an AND circuit 37, and the drive circuit 33 controls the switching element Q1 to be turned on and off in accordance with the AND output.
  • the above-mentioned drive pulse changes the pulse width on the basis of amplitude of a load current flowing to the LED module 4, and the above-mentioned PWM signal changes the on-duty on the basis of a dimming level.
  • a resistance R1 in Fig. 1 is a resistance for current detection to detect the current flowing to the switching element Q1.
  • the switching element Q1 is switched from being turned off to being turned on at timing when the current I2 flowing to the inductor L1 becomes zero, and the mode is referred to as a critical mode.
  • the above-mentioned PWM signal becomes Low, it is stopped to input the drive pulse to the drive circuit 33, and accordingly the oscillation is stopped during the period, that is, a state where the LED module 4 is lighted off is produced. Then, by varying the on-duty of the above-mentioned PWM signal, a ratio between a lighting-on state and the lighted-off state is changed, and consequently the output of the LED module 4 can be controlled.
  • Ton L 1 Vout ⁇ V 1 Idp
  • Toff L 1 V 1 Idp
  • the load current I1 of the LED module 4 is slightly increased even when the PWM signal is varied, for example, from a solid line to a broken line. And accordingly the rapid change of the optical output can be suppressed.
  • Fig. 3 shows change of the optical output to the duty ratio of the PWM signal
  • the optical output appears to change in a stepwise fashion when the LED module 4 is directly looked; however, the change was in a level where the change cannot be recognized on an irradiation surface of the light as a flicker.
  • K>2.5 the change is recognized on the above-mentioned irradiation surface as the flicker, and accordingly it is preferable to set the output voltage Vout of the direct-current power source 1 to be two and half times larger than the load voltage V1 of the LED module 4 or less.
  • the lower limit of the output voltage Vout requires K>1, it is preferable to satisfy 1 ⁇ K ⁇ 2.5.
  • the variation of the load voltage V1 due to a temperature characteristic of the LED and the like it is more preferable to satisfy 1.2 ⁇ K ⁇ 2.5.
  • Fig. 4 is a schematic circuit diagram showing another example of the LED lighting device according to the present embodiment.
  • a drive pulse of the drive pulse generation part 34 and an AND output of the PWM signal are outputted to the drive circuit 33 with use of the AND circuit 37; however, in the present example, a voltage superimposing the PWM signal on the voltage of the resistance R1 is compared with the reference voltage Vref, and the reset signal is outputted to the drive pulse generation part 34 in the case of exceeding the reference voltage Vref.
  • other configurations are the same as those of Fig. 1 , and accordingly the same numerals are given to the same components to omit the explanations.
  • a signal of the reference voltage Vref or more is inputted to the comparator 35 when the PWM signal is Low, and thus the reset signal continues to be inputted to the drive pulse generation part 34. Accordingly, on this occasion, the drive pulse is not inputted to the drive circuit 33, and the switching element Q1 is kept to be off.
  • the PWM signal is High, the output of the drive pulse generation part 34 becomes High due to the inputting of the output signal from the starter 32 or the zero current detection circuit 31 to turn on the switching element Q1 via the drive circuit 33, in the same manner as that of the LED lighting device shown in Fig. 1 .
  • the comparator 35 outputs the reset signal, and accordingly the output of the drive pulse generation part 34 becomes Low to turn off the switching element Q1.
  • the switching element Q1 is controlled to be on and off due to the drive pulse from the drive pulse generation part 34 in the same manner as that of the LED lighting device shown in Fig. 1 .
  • a universal IC for PFC MC33262 manufactured by the ON Semiconductor Co., Ltd. and L6562 manufactured by STMicroelectronics Co., Ltd.
  • the control circuit part 3 can be used as the control circuit part 3, and consequently the number of parts can be reduced.
  • the off period Toff where the optical output does not vary due to the change of the duty ratio of the above-mentioned PWM signal can be shortened, and consequently the optical output can be smoothly changed in the sweeping of the PWM signal.
  • the switching element Q1 by switching the switching element Q1 to be turned on in synchronization with detection timing of the zero current detection circuit 31, the on/off control of the switching element Q1 can be certainly performed.
  • an illumination fixture able to smoothly change the optical output in the sweeping of the PWM signal can be provided by using the LED lighting device according to the present embodiment.
  • the switching element Q1 is controlled in the critical mode; however, the switching element Q1 may be controlled in a sequential mode for switching the switching element Q1 to be turned on, for example, before the current I2 flowing to the inductor L1 in the turning-off of the switching element Q1 becomes zero (I2>0). Also in this case, by setting the output voltage Vout of the direct-current power source 1 to be larger than the load voltage V1 of the LED module 4 and to be 2.5 times as large as the load voltage V1 or less, the optical output can be smoothly changed in the sweeping of the PWM signal, and additionally the on/off control of the switching element Q1 can be certainly performed.
  • the switching element Q1 is controlled in a non-sequential mode (an operation mode having a period where the current I2 flowing to the inductor L1 becomes zero), the off-period of the switching element Q1 becomes long, and accordingly the operation mode is disadvantageous with respect to the above-mentioned critical mode and sequential mode, but has an advantage that the change of the optical output can be smooth.
  • the present embodiment is different from the first example in that the direct-current power source 1 includes an AC-DC converter and further the load voltage V1 of the LED module 4 is feed backed to the AC-DC converter. Meanwhile, other configurations are the same as those of the first embodiment, and accordingly explanations of the same components will be omitted by adding the same reference numerals.
  • the LED lighting device includes: the step-down chopper circuit part 2, the control circuit part 3, and a voltage detection part 6 for detecting the load voltage V1 of the LED module 4 and feed backing the load voltage V1 to the direct-current power source 1.
  • the direct-current power source 1 includes the AC-DC converter for converting an alternating-current output of a commercial alternating-current power source 5 into a direct-current voltage of a desired voltage value, and includes: an error amplifier 12 for comparing the load voltage V1 of the LED module 4 with the output voltage Vout and amplifying and outputting the error, and a control circuit 11 for controlling the switching element Q2 to be turned on and off in accordance with an output value of the error amplifier 12.
  • the voltage detection part 6 detects the load voltage V1 of the LED module 4 and feed backs the load voltage V1 to the direct-current power source 1, and in the direct-current power source 1, the feedback controls is performed so that the output voltage Vout can be K times larger than the feed backed load voltage V1. Accordingly, in the same manner as that of the first example when 1 ⁇ K ⁇ 2.5 is set, the off period Toff where the optical output does not vary due to the change of the duty ratio of the PWM signal can be shortened, and consequently the optical output can be smoothly changed in the sweeping of the PWM signal.
  • the load voltage V1 when the load voltage V1 is feed backed to the direct-current power source 1, a relationship between the output voltage Vout of the direct-current power source 1 and the load voltage V1 of the LED module 4 can be retained to be constant even in the case where the load voltage V1 caries, and consequently, the optical output variation more close to a linear-shape with respect to the PWM signal can be realized.
  • the on-duty of the switching element Q1 is 1/K, and the more the K is close to 1, the more the illumination variation becomes smooth.
  • ripples of 100Hz/120Hz appear in the output voltage Vout due to a capacity of an electrolytic capacitor C1 and the like, and thus the flicker of the optical output of the LED module 4 may occur due to interference between the ripples and a frequency of the PWM signal.
  • Fig. 6 is a schematic circuit diagram showing another example of the LED lighting device according to the present embodiment, the illustrations of the AC-DC converter and the voltage detection part 6 in Fig. 5 are omitted.
  • an electrolytic capacitor C2 is connected in parallel with the LED module 4, the ripples of the current flowing to the LED module 4 can be reduced by the electrolytic capacitor C2, and consequently the flicker of the optical output can be suppressed.
  • the illumination fixture able to smoothly change the optical output in the sweeping of the PWM signal can be provided by using the LED lighting device according to the present embodiment.
  • the direct-current power source 1 includes the AC-DC converter but may include a DC-DC converter.
  • the step-down chopper circuit part 2 is provided on a low-voltage side of the direct-current power source 1; however, the step-down chopper circuit part 2 may be provided on a high-voltage side of the direct-current power source 1.
  • the LED lighting device employing the LED as loads is explained as an example; however, the load is desired to be the solid light-emitting element, for example, may be an organic EL.
  • the on/off of the switching element Q1 is controlled in accordance with the drive pulse in the on-period of the PWM signal (refer to Fig. 2 ); however, the on/off of the switching element Q1 may be controlled in accordance with the drive pulse in the off-period of the PWM signal. Meanwhile, in this case, it is required to set the length of the off-period of the PWM signal in accordance with the dimming level.

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

Claims (5)

  1. Lichtemittierende Festkörperelement-Beleuchtungsvorrichtung, umfassend:
    eine Gleichspannungsquelle (1) und eine Reihenschaltung eines Induktors (L1) und eines Schaltelements (Q1), die über eine Last (4) zwischen Ausgangsanschlüsse der Gleichspannungsquelle (1) geschaltet sind;
    eine Diode (D1) zum Regenerieren von während des Einschaltens des Schaltelements (Q1) in dem Induktor (L1) angesammelter Energie zur Last (4) während des Ausschaltens des Schaltelements (Q1)
    und einen Steuerschaltungsteil (3) zum Steuern des Ein- und Ausschaltens des Schaltelements (Q1), wobei
    der Steuerschaltungsteil (3) einen Ansteuersignalerzeugungsteil (34) zum Erzeugen eines Ansteuersignals, dessen Pulsbreite gemäß einer Amplitude eines Laststroms (II) variiert, beinhaltet und das Ein- und Ausschalten des Schaltelements (Q1) gemäß dem Ansteuersignal in einer Ein-Periode oder einer Aus-Periode eines PWM-Signals steuert, dessen Einschaltdauer gemäß einem Dimming-Grad variiert, wobei das PWM-Signal eine niedrigere Frequenz als das Ansteuersignal hat; und
    einen Spannungserkennungsteil (6) zum Erkennen der an die Last (4) angelegten Lastspannung (V1) und Zurückkoppeln der Lastspannung (V1) zur Gleichspannungsquelle (1) bereitgestellt ist;
    dadurch gekennzeichnet, dass die Gleichspannungsquelle (1) einen AC-DC-Wandler oder einen DC-DC-Wandler beinhaltet, zu dem die erkannte Lastspannung (V1) zurückgekoppelt wird und der die Ausgangsspannung (Vout) regelt, so dass sie K-mal größer als die erkannte Lastspannung (V1) ist,
    gemäß Vout = K × V 1
    Figure imgb0008
    und so dass die Gleichspannungsquelle (1) dafür ausgelegt ist, die Ausgangsspannung (Vout) gemäß 1<K≤2,5 so einzustellen, dass sie größer als die Lastspannung (V1) ist und 2,5-mal so groß wie die Lastspannung (V1) oder kleiner ist;
    wobei die Einschaltdauer (Don) des Schaltelements (Q1) wie folgt ist: Don = Vl Vout
    Figure imgb0009
  2. Lichtemittierende Festkörperelement-Beleuchtungsvorrichtung nach Anspruch 1, wobei
    der Steuerschaltungsteil (3) eine Nullstromerkennungsspannung (31) zur Erkennung, dass ein zum Induktor (L1) fließender Strom null wird, beinhaltet und das Schaltelement (Q1) in Synchronisation mit Erkennungszeitsteuerung der Nullstromerkennungsschaltung (31) von Ausschaltung auf Einschaltung umschaltet.
  3. Lichtemittierende Festkörperelement-Beleuchtungsvorrichtung nach Anspruch 1, wobei
    der Steuerschaltungsteil (3) das Schaltelement (Q1) so schaltet, dass es eingeschaltet wird, bevor ein zum Induktor (L1) fließender Strom während des Ausschaltens des Schaltelements (Q1) null wird.
  4. Lichtemittierende Festkörperelement-Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 3, wobei
    die Gleichspannungsquelle (1) den AC-DC-Wandler beinhaltet und eine Frequenz des PWM-Signals auf 600 Hz oder Vielfache von 600 Hz eingestellt ist.
  5. Leuchtkörper, der Folgendes aufweist: die lichtemittierende Festkörperelement-Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 4 und ein lichtemittierendes Festkörperelement, an das von der lichtemittierenden Festkörperelement-Beleuchtungsvorrichtung Beleuchtungsleistung angelegt wird.
EP12159970.8A 2011-03-18 2012-03-16 Feste LED-Beleuchtungsvorrichtung und Beleuchtungsbefestigung damit Not-in-force EP2519079B1 (de)

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JP2011060866A JP5821023B2 (ja) 2011-03-18 2011-03-18 固体発光素子点灯装置及びそれを用いた照明器具

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JP6493725B2 (ja) 2014-08-27 2019-04-03 パナソニックＩｐマネジメント株式会社 点灯装置及び照明器具
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EP2519079A1 (de) 2012-10-31
JP2012199002A (ja) 2012-10-18
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CN102685977A (zh) 2012-09-19
CN102685977B (zh) 2015-04-01

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