CN101106856B - Lighting apparatus - Google Patents
Lighting apparatus Download PDFInfo
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- CN101106856B CN101106856B CN2007101280724A CN200710128072A CN101106856B CN 101106856 B CN101106856 B CN 101106856B CN 2007101280724 A CN2007101280724 A CN 2007101280724A CN 200710128072 A CN200710128072 A CN 200710128072A CN 101106856 B CN101106856 B CN 101106856B
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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]
- H05B45/10—Controlling the intensity of the light
- H05B45/18—Controlling the intensity of the light using temperature feedback
-
- 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]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- 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
-
- 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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A lighting apparatus is provided, which has a not lowered light output and a long life even service time is prolonged. The lighting apparatus includes a light source having a phosphor and a resin including the phosphor, and having a characteristic that as a provided electric power is increased, a decreased rate of a lumen maintenance factor is increased, and an electric-to-optical conversion efficiency is reduced; a radiation element, directly or indirectly disposed on the light source; a power source, capable of changing the electric power supplied to the light source; and a controller, reducing the electric power provided to the light source at an initial period, and making the provided electric power increase as a function of time.
Description
Technical field
The present invention relates to lighting devices such as a kind of light-emitting diode.
Background technology
Before; Provide like lower lighting device; That is, for the reduction of light that the change in long term because of fluorescent lamp (fluorescent lamp) is caused output or use the reduction of the light output that the dirt that adhered to causes because of accompanied by long-term and revise, to adding up service time behind the lamp timing from changing; And the mode that increases the light modulation amount with the increase of following service time is carried out light modulation (for example, with reference to patent documentation 1).
Here; The light modulation amount is meant the electric power that supplies to lamp and the ratio of rated value, at the use initial stage, for example lights a lamp with 70% light modulation amount of rated value; Follow the increase of service time; The light modulation amount is increased, prevent reduction, make the light output almost fixed of lamp because of the light that change in long term the was caused output of lamp with this.And, so that the light modulation amount reaches 100% (full light) near useful life of lamp the time, then when bringing into use lamp, make the light modulation amount less through controlling, be 70% of rated value as as stated, thus the effect that can obtain to save 30% energy.
And, even when changing lamp, also can implement as follows; That is, after changing lamp, immediately the light modulation amount is set near be in useful life light output with respect to the ratio of specified light output (for example about 70%), is accompanied by service time through said lamp; Said light output is increased, near useful life the time, make the light of said lamp be output as about 100%; Make the light of said lamp export immobilization chronically (for example, with reference to patent documentation 2) thus.
Here; The reason that the light output that causes for the change in long term because of fluorescent lamp reduces; The deterioration of the fluorophor of fluorescent lamp, the minimizing of electronic emission material etc. have been considered to constitute; But when having fluorophor and comprise the situation of luminescence component of resin of fluorophor, except that fluorophor, and then the deterioration of resin etc. also becomes problem.
[patent documentation 1] japanese patent laid-open 9-97683 number
[patent documentation 2] Japanese Patent Laid is opened 2000-315589 number
Summary of the invention
[problem that invention institute desire solves]
The object of the present invention is to provide a kind of lighting device, even increase service time, light output can not reduce yet and can realize the long-life.
[method of dealing with problems]
In order to realize said purpose, a form of the present invention relates to a kind of lighting device, it is characterized in that comprising: light-emitting diode; Possesses fluorophor and tree refers to; And have along with the increase that drops into electric power, the lapse rate of light beam sustainment rate increases, the characteristic that electricity-light conversion efficiency reduces; Heat-sink unit is arranged on the said light-emitting diode directly or indirectly; Power supply unit can change the electric power that said light-emitting diode is supplied with; And control part, corresponding with the time of totally lighting a lamp, suppress input electric power in the early stage to said light-emitting diode; And be accompanied by the process of time; Increase said input electric power, said light-emitting diode is along with the process that adds up the time of lighting a lamp, and the decreasing ratio of said light beam sustainment rate can diminish; Said control part is based on the electric power of increasing input of the said accumulative total time of lighting a lamp; Control becomes extended immobilizationization from the light output of said light-emitting diode; And when the said accumulative total time of lighting a lamp arrives predetermined value, make and drop into electric power and become certain or the increment rate that drops into electric power is descended.
In order to realize said purpose; Another form of the present invention relates to a kind of lighting device; It is characterized in that comprising: said light-emitting diode comprises: contain fluorophor resin, have the resin reflecting plate of recess and be configured in the luminescence component in the said recess, and said light-emitting diode possesses: follow the thermal degradation when influence of said resin reflecting plate; Make the lapse rate of light beam sustainment rate increase the characteristic that electricity-light conversion efficiency reduces; Control part arrives predetermined value in the decreasing ratio of said light beam sustainment rate, and when having lit a lamp the time to desired accumulative total, makes to drop into electric power and become certain or the increment rate that drops into electric power is descended.
According to the present invention, by light source itself is had along with the increase that drops into electric power, the lapse rate of light beam sustainment rate increases; The characteristic that electricity-light conversion efficiency reduces; Suppress input electric power and be incorporated into, and follow the process of time, make the characteristic of the control part of said input electric power increase said light source at the said initial stage; Light output that can stable for extended periods of time, and can realize long lifetime.
Particularly, after bringing into use light source,, apply lower input electric power, penetrate the lower light output predetermined accordingly from said light source thus with said input electric power from power supply unit according to signal from control part., be accompanied by service time through said light source, will be applied to said light source according to the input electric power that increases gradually from the signal of said control part thereafter.So; After bringing into use light source, suppress the input electric power of power supply unit, and then distribute the heat of light source through heat-sink unit; Make resin, for example thus; The resin and the resin reflecting plate that comprise fluorophor can not be exposed under the high temperature suddenly, can suppress the thermal degradation when to said resin in the early stage, and can suppress the reduction of the light output that the deterioration of the heat of the deterioration because of resin, resin reflecting plate (framework) that particularly deterioration of initial stage time heat is big causes.
Therefore; Consider and bring into use the input electric power that applies immediately behind the said light source and be accompanied by the increase that drops into electric power and the reduction degree that makes the said electricity-light conversion efficiency of said light source; Ratio by the input electric power that said power supply unit is increased according to the signal of said control part is suitably controlled; Can make the light output extended immobilizationization of said light source, and can make the life-span of said light source long-term.Again; Said control part is after the process scheduled time; Make said input electric power become certain or the increment rate of said input electric power is descended, slow down by the ascending curve that drops into electric power, the deterioration of the light-emitting device that causes is suppressed so that be accompanied by the increase that drops into electric power (amount).
That is, follow the reduction (rising) of working temperature, said electricity-light conversion efficiency increases (minimizing); Therefore, in this form, if be suppressed to the working temperature of said light source lower; Then said light source itself demonstrates high light output for a long time; Be incorporated into said action effect, lighting device integral body can keep stable light output chronically, and can realize long lifetime.
And; For example when said light source by light-emitting diode (below; Sometimes abbreviate " LED (light-emitting diode, light-emittingdiode) " as) when constituting, through under low said working temperature state, using said light source; Then can prevent the deterioration of employed resin when said light source is installed etc., particularly can prevent the deterioration of resin reflecting plate.Again; As above-mentioned light source; Use organic electronic luminous (electro-luminescence, below, abbreviate as sometimes " organic EL ") assembly to be when replacing light-emitting diode; Equally also can, said light source prevent the deterioration of employed organic substance or resin (for example, photoresist) etc. when being installed.
And in other forms of the present invention, said control part can generate reference signal; For example, reference voltage (reference voltage) is in order to control the light output of said light source; Said control part can suppress said reference signal (for example, reference voltage) in the early stage, follows the process of time; Said reference signal (for example, reference voltage) is increased.At this moment, can carry out aforesaid control to said light source more simply.
Again, in other a kind of form of the present invention, said control part can be lit a lamp the time to generate reference signal according to accumulative total.At this moment, can carry out aforesaid control to said light source more simply.
Again, said control part possesses a kind of and accumulative total is lit a lamp time and signal value control signal corresponding are with the reference signal of output corresponding to said signal value.At this moment, can on time series, control said light source with desired form.And when the said accumulative total time of lighting a lamp surpassed desired lighting a lamp the time (for example, the scheduled time of regulation), said control part dropped to till the predetermined output output of reference signal, and the output of the light of light source becomes vanishing state or becomes faint light output.Here, the meaning of so-called faint light output is, for example lighting device (light source) when reaching the life-span or reach before the life-span cognitive degree glazing to export be faint.At this moment, reached the life-span or be in the stage that reaches before the life-span, then known the replacing period of lighting device (light source) because reported lighting device (light source).Again, when the said accumulative total time of lighting a lamp surpassed desired lighting a lamp the time (for example, the final scheduled time), said control part stopped the output of reference signal, and the light output of light source also stops.At this moment, lighting device has reached after the life-span, and the outgoing phenomenon is ended.
Again, said control part possesses correction portion, and it is revised the output change corresponding with supply voltage.At this moment, owing to can revise, then can suppress the change of light output to the output that change the caused change of supply voltage.Again, said light source is the light-emitting diode that comprises resin reflecting plate and luminescence component, and said resin reflecting plate has recess, and said luminescence component is configured in the said recess.At this moment, because the thermal degradation when of the big resin reflecting plate of the deterioration of particularly initial stage can be suppressed time heat, then possess lowly also can being suppressed of light output of the lighting device of light-emitting diode.Again; Be accompanied by the deterioration of resin reflecting plate and when making the decreasing ratio of light beam sustainment rate reach predetermined value; For example, when the decreasing ratio of light beam sustainment rate reaches the predetermined value of nearby locating of having slowed down, then make and drop into electric power and keep certain or the increment rate that drops into electric power is descended.At this moment, dropping into the variation of electric power on time series can be consistent period with the deterioration of resin reflecting plate.Promptly; Necessarily maybe the period of the increase ratio of this input electric power decline can be consistent because the decreasing ratio of the light beam sustainment rate that thermal degradation when caused of resin reflecting plate becomes less period and the maintenance of this inputs electric power; So can more effectively suppress the deterioration of resin reflecting plate, also can more effectively shine.
[effect of invention]
As stated, according to the present invention, a kind of lighting device can be provided, even increase service time, light output can deterioration yet and can be realized long lifetime.
Description of drawings
Fig. 1 is that expression can be as the pie graph of the example of the LED of the light source of lighting device of the present invention.
Fig. 2 is the figure of an example of the whole circuit formation of expression lighting device of the present invention.
Fig. 3 is the chart of expression by an example of the reference voltage that control part produced of lighting device of the present invention.
Fig. 4 is another example that the whole circuit of expression lighting device of the present invention constitutes.
Fig. 5 is an example of the relation of the expression accumulative total time of lighting a lamp-input electric power.
Fig. 6 is another example of the relation of the expression accumulative total time of lighting a lamp-input electric power.
Fig. 7 is another example of the relation of the expression accumulative total time of lighting a lamp-input electric power.
Fig. 8 is another example of the relation of the expression accumulative total time of lighting a lamp-input electric power.
To be expression resin reflecting plate light a lamp the thermal degradation when of time and the relation on the time series of electric power of dropping into the diagram shown in the mode of pattern to accumulative total to Fig. 9.
Figure 10 is another example that the whole circuit of expression lighting device of the present invention constitutes.
Figure 11 be the expression lighting device of the present invention light source portion, the light beam sustainment rate with respect to the time dependent behavior of lighting a lamp one the example chart.
Figure 12 be represent lighting device of the present invention with the mode of pattern the light output of light source portion with respect to the chart of the time dependent behavior of lighting a lamp.
Figure 13 be with the mode of pattern represent to the light source of lighting device of the present invention input electric power, with the chart of the relation of electricity-light conversion efficiency.
Figure 14 be represent lighting device of the present invention with the mode of pattern the light output of light source portion with respect to the chart of the time dependent behavior of lighting a lamp.
10:LED lamp (light source portion) 12:LED chip
13: substrate 14: electric insulation layer
15,15a, 15b: circuit pattern 16: closing line
17: recess 18: framework
19: contain fluorophor resin bed 20: power supply unit
21: AC power 22: drive circuit
23: current-voltage conversion circuit 30: control part
31: add up to light a lamp time timing circuit 32: functional circuit
33: error amplifying circuit C1: smoothing capacitor
C2: capacitor D1: diode
DB: rectifier L1: inductor
T1: transistor T 1, T2, T3: time
Vs: reference voltage
Embodiment
Below, based on optimal morphology, other characteristics of the present invention and advantage are described in order to carry out an invention.In addition, in this example, the situation as representational lighting device with LED is described.
Fig. 1 is the pie graph that expression can be used as the example of the LED that the light source of lighting device of the present invention uses.LED lamp 10 shown in Figure 1 has the led chip 12 as luminescence component.Led chip 12 can use for example blue-light-emitting type led chip or UV-light luminous type led chip etc.Said led chip 12 carries Jie and is arranged on the circuit pattern 15 on the predetermined basal component 13 across electric insulation layer 14.
Framework (frame) 18 is being set on substrate 13, and it forms towards the top and the recess 17 of the circular cone trapezoidal shape that diameter enlarges gradually, and led chip 12 is configured in the said recess 17.Recess 17 for example forms, and the bottom surface diameter is that 2.0～4.0mm, upper surface diameter are that 1.5～4.5mm, the degree of depth are the circular cone trapezoidal shape of 0.5～1.0mm; Framework 18 is by for example polybutylene terephthalate (polybutylene terephthalate; PBT), polyphthalamide (polyphthalamide; PPA), (Polycarbonate, PC) grade forms Merlon.
In the recess that is disposing led chip 12 17; Be provided with by the formed fluorophor resin bed 19 that contains of the transparent thermosetting resin that contains fluorophor (heat-hardening resin), led chip 12 is to utilize to contain fluorophor resin bed 19 and be sealed in the recess 17.Use distributor injection devices such as (dispenser), the transparent liquid thermosetting resin that is mixing fluorophor is injected in the recess 17 that is disposing led chip 12, and utilize the method that is described below to carry out heat hardening, form this thus and contain fluorophor resin bed 19.
In addition, graphic in, the upper surface that contains fluorophor resin bed 19 and the upper end of recess 17 are become on same horizontal plane, but are not to be defined in this especially.
The said fluorophor resin bed 19 that contains has led chip 12 is sealed in the function in the recess 17, and has the function as illuminating part concurrently.That is, contain the fluorophor that is contained in the fluorophor resin bed 19, excite through light, for example blue light or ultraviolet ray and send visible light from led chip 12 radiation.
As being used to form the transparent liquid thermosetting resin that contains fluorophor resin bed 19, can enumerate silicon rubber (silicone rubber), silicones (silicone resin), epoxy resin (epoxy resin).And the fluorophor that is contained in the aforesaid thermosetting resin limits especially, can be according to does suitably selection as the illuminant colour of the LED lamp 10 of target etc.
For example, when using blue-light-emitting type led chip 12 to obtain when white luminous, the main use sent the yellow fluorophor of sodium yellow to the light between orange-colored light.And, in order to seek to improve color rendering (color rendering properties) etc., except that the yellow fluorophor, also can use red light-emitting phosphor.As sending the yellow fluorophor of sodium yellow, can use for example RE to the light between orange-colored light
3(Al, Ga)
5O
12: yttrium-aluminium-garnet (Yttrium Aluminum Garnet, YAG) fluorophor, the AE of Ce fluorophor (RE representes to be selected from least a among Y, Gd and the La, below identical) etc.
2SiO
4: the silicate phosphor of Eu fluorophor (AE is alkaline earth elements (alkaline earth elements) such as Sr, Ba, Ca, below identical) etc.
And, when using UV-light luminous type led chip 12 to obtain mainly to use RGB (Red, Green, Blue, RGB) fluorophor when white luminous.As blue-light-emitting fluorescent material, can use for example as AE
10(PO
4)
6Cl
12: (halophosphate) fluorophor of the halogen-phosphate as the Eu fluorophor or as (Ba, Mg) Al
10O
17: the chlorate MClO 3 fluorescent substance as the Eu fluorophor etc.As the green emitting fluorophor, can use like (Ba, Mg) Al
10O
17: the chlorate MClO 3 fluorescent substance as the Eu, Mn fluorophor etc.As red light-emitting phosphor, can use like La
2O
2Oxysulfide fluorophor as the S:Eu fluorophor etc.
And then, also can replace aforesaid fluorophor, can use the nitride based fluorophor that can obtain various illuminant colours (AE for example according to forming
2Si
5N
8: Eu), nitrogen oxide is fluorophor (Y for example
2Si
3O
3N
4: Ce), sialon (sialon) be fluorophor (for example AEx (Si, Al)
12(N, O)
16: Eu) etc.In addition, LED lamp 10 is not limited to white light-emitting lamp, also can constitute the illuminant colour that has beyond the white.When utilizing LED lamp 1 to obtain luminous, for example Neutral colour luminous beyond the white, can come suitably to use various fluorophor according to illuminant colour as target.
Fluorophor can be any fluorophor in decentralized and the sedimentation type.
Secondly, Fig. 2 representes to comprise the example that the whole circuit of lighting device of the present invention of LED lamp 10 shown in Figure 1 constitutes.
As shown in Figure 2, lighting device of the present invention has described LED lamp 10, power supply unit 20 and control part 30.
Drive circuit 22 is switched on or switched off transistor T 1; When transistor T 1 was connected, energy stored among the capacitor C2 through inductor L1, when transistor T 1 breaks off; The energy that is stored among the capacitor C2 is fed into light source portion 10; Thus, light source portion 10 is carried out supply capability, keeping so that light a lamp.
In addition, current-voltage conversion circuit 23 is being set in power supply unit 20, the electric power that supplies to light source portion 10 (electric current) is being converted into after the voltage, importing in the error amplifying circuit of control part as follows.
On time series, supply with reference voltage V s with form for example shown in Figure 3.That is, supply with: beginning the initial stage of lighting a lamp of light source portion 10, supply with reference voltage V s, be accompanied by the increase that adds up the time of lighting a lamp, said value is risen with lower value with following form.
In the error amplifying circuit 33; To comparing with reference voltage V s from control part 30 from the magnitude of voltage of power supply unit 20; Make from the said magnitude of voltage of power supply unit 20 with consistent from the reference voltage V s of control part 30; And prearranged signal is transported in the drive circuit 22 of power supply unit 20, drive circuit 22 is switched on or switched off transistor T 1 according to said signal, and makes the said magnitude of voltage that should supply to light source portion 10 roughly consistent with reference voltage V s.Thus, will supply to light source portion 10, with the operation of lighting a lamp based on the voltage (electric power) of the form of reference voltage V s with reference voltage V s correspondent voltage (electric power).
Constitute in the example at above-mentioned circuit, the reference voltage V s that supplies to error amplifying circuit 33 adopts form as shown in Figure 3 on time series.Promptly; Bring into use after (lighting a lamp) immediately and the low corresponding to mode of reference voltage V s of coming with light source portion 10 by control part 30; Apply lower input electric power from power supply unit 20, thus, send the lower light output predetermined accordingly with said input electric power from light source portion 10.Afterwards, be accompanied by use (lighting a lamp) time through light source portion 10, increase the reference voltage V s of this control part 30, therefore, the input electric power that will increase gradually from power supply unit 20 is applied to light source portion 10.Therefore, at this moment, through revise light output like the control part of being put down in writing in the said patent documentation 2.
And then, constitute in the example at above-mentioned circuit, after bringing into use the light source portion 10 of LED lamp shown in Figure 1 etc.; According to signal from control part 30; Apply lower input electric power from power supply unit 20, thus, send the lower light output predetermined accordingly with said input electric power from light source portion 10.Afterwards, be accompanied by service time,, said light source applied the input electric power that increases gradually according to signal from said control part through said light source.
So, after bringing into use light source portion 10, the input electric power from power supply unit 20 is suppressed; And then distribute the heat of light source portion 10 by heat-sink unit, thus, can suppress resin, for example; Resin reflecting plate 18, the resin bed 19 etc. that comprises fluorophor are exposed under the high temperature suddenly; And can suppress the thermal degradation when of initial stage, particularly can suppress the thermal degradation when of the big resin reflecting plate 18 of the thermal degradation when at initial stage, therefore can suppress the deterioration of resin and the reduction of the light output that causes said resin.
Therefore; Consider and bring into use the input electric power that is applied after the light source portion 10 and be accompanied by the increase that drops into electric power and the reduction degree that makes the said electricity-light conversion efficiency of said light source; To power supply unit 10 based on the signal of control part 30 and the ratio of the electric power of increasing input suitably to control, thus, can make the light output extended immobilizationization of said light source 10; And, can make the life-span of said light source long-term.
That is, follow the reduction (rising) of working temperature, said electricity-light conversion efficiency increases (minimizing); Therefore; If the working temperature of light source portion 10 is suppressed to lower, then light source itself will demonstrate high light output for a long time, be incorporated into said action effect; Lighting device integral body can keep stable light output chronically, and can realize long lifetime.
Secondly, Fig. 4 shows another example that all circuit of lighting device of the present invention constitute.Omit the repeat specification that foregoing circuit constitutes the item of having explained in the example again.As shown in Figure 4, this circuit constitutes in example, and to constitute example different with previous circuit, do not possess current-voltage conversion circuit 23 and error amplifying circuit 33, do not carry out what is called feedback (feedback) control but open circuit controls.Control part 30 can adopt input electric power (W) to the relation on the time series of totally light a lamp the time (H) by various forms.For example; Can convert accumulative total accumulative total that time timing circuit 31 calculated time of lighting a lamp of lighting a lamp to said accumulative total pairing signal of time (reference signal) S that lights a lamp by functional circuit 32 in the control part 30; This reference signal S is supplied to the drive circuit 22a of power supply unit 20, in drive circuit 22a, corresponding to this reference signal S transistor T 1 is switched on or switched off, and can stipulate to be supplied to the voltage (electric power) in the light source portion 10 whereby; That is, drop into electric power.
Again, this circuit constitutes in example, and control part 30 possesses makes totally light a lamp time and signal value corresponding control signal table on time series.For example; Above-mentioned control signal table is stored in the memory portion (not shown) of functional circuit 32 in advance; Come this accumulative total of instrumentation to light a lamp the time through this accumulative total time timing circuit 31 of lighting a lamp, the calculation part (not shown) of functional circuit 32 is extracted the said accumulative total pairing reference signal S of time that lights a lamp out by the control signal table of this memory portion, and the signal efferent (not shown) of functional circuit 32 is supplied to drive circuit 22a with this reference signal S; In drive circuit 22a, transistor T 1 is switched on or switched off corresponding to this reference signal S; Can stipulate to be supplied to the voltage (electric power) in the light source portion 10 whereby, that is, drop into electric power.Again, the said accumulative total time of lighting a lamp also can be supplied to drive circuit 22a with variable predetermined reference signal S according to said control signal table when reaching preset a plurality of stipulated time.
Concern that illustration is following on the time series of this accumulative total time of lighting a lamp-input electric power.Among Fig. 5, what be accompanied by the time of totally lighting a lamp drops into the electric power increase through making in certain proportion, after the desired accumulative total time of lighting a lamp reaches, input electric power is kept necessarily.In the example of Fig. 6, be accompanied by the process that adds up the time of lighting a lamp, make with predetermined interval and drop into electric power stage ground (stage shape) increase, after the desired accumulative total time of lighting a lamp reaches, input electric power is kept necessarily.In the example of Fig. 7, for example in the relation of the accumulative total of Fig. 6 time of lighting a lamp-input electric power, more light a lamp the time (predetermined stipulated time) when reaching in predetermined accumulative total, dropping into electric power almost becomes zero.In the example of Fig. 8, for example in the relation of the accumulative total of Fig. 6 time of lighting a lamp-input electric power, more light a lamp the time (final stipulated time) in predetermined accumulative total when reaching, dropping into electric power becomes zero.So; By stipulating this accumulative total time of lighting a lamp-input electric power, then under the situation of Fig. 5, because after the predetermined accumulative total time of lighting a lamp reaches; Input electric power is kept necessarily, then can be made because the early stage deterioration of the light-emitting device that increase caused of input electric power (amount) is suppressed.Under the situation of Fig. 6 because stage ground makes and drops into electric power and increase, then certain during light export and can keep certain.Under the situation of Fig. 7, know the replacing period of light source portion (LED lamp) again.Under the situation of Fig. 8, can make luminous the stopping of the light source portion (LED lamp) that has arrived the life-span.Drop into that electric power is lit a lamp the time with respect to accumulative total and the form that increases is not limited to the form of above-mentioned Fig. 5 and Fig. 6 again.Again, when the predetermined accumulative total time of lighting a lamp reaches among Fig. 7 and Fig. 8, making and drop into that electric power descends (almost to zero till) or the form that stops to be not limited to the form of above-mentioned Fig. 6, can also be the form of Fig. 5 etc.
Secondly, explain with the relation on the time series that drops into electric power with regard to the thermal degradation when of resin reflecting plate 18.Fig. 9 is that 18 pairs of accumulative totals of resin reflecting plate are lit a lamp the thermal degradation when of time and the relation on the time series of electric power of dropping into the figure shown in the pattern mode.Dotted line is represented the light a lamp relation of decline ratio of light beam sustainment rate of time and lighting device 1 of the accumulative total of resin reflecting plate 18.Solid line representes to add up the time of lighting a lamp and the graph of a relation that drops into electric power.Shown in the dotted line of Fig. 9, resin reflecting plate thermal degradation when apace during 18 initial stages, the light beam sustainment rate descends significantly.Yet the decline ratio of this light beam sustainment rate becomes along with the process of time slowly and (diminishes).The light beam sustainment rate roughly converges certain value (that is, the decline ratio approaches zero) in predetermined accumulative total is lit a lamp the time, this when we study clearly.Therefore; For example, can form a kind of formation, be accompanied by the thermal degradation when of resin reflecting plate 18 during this constitutes and reach the predetermined value of nearby locating that slowed down (promptly in the decline ratio of light beam sustainment rate; Predetermined threshold value; For example, the T α of Figure 10) time, can make and drop into the increment rate decline that electric power keeps certain or makes input electric power.By this kind formation, then can make the deterioration of variation and resin reflecting plate 18 on the time series that drops into electric power consistent period.That is, can hold the characteristic of resin reflecting plate in advance, can easily control light output make become certain.Again, above-mentioned predetermined value (predetermined threshold value) for example is accompanied by the thermal degradation when of resin reflecting plate 18 and the decline ratio of light beam sustainment rate is often changed, and can wait suitably according to the life-span of lighting device and determine.
Secondly, Figure 10 shows another example again that all circuit of lighting device of the present invention constitute.Omit the repeat specification of the item of having explained in the foregoing circuit formation again.Shown in figure 10, have the power supply change that the change of source current is done to revise in the control part 30 of this lighting device and revise (compensation) circuit 34.It is arranged side by side with AC power AC21 that (compensation) circuit 34 is revised in the change of this power supply, and with drive circuit 22a tandem disposing.When the power supply voltage variation of AC power AC21, the reference signal S that flows to this drive circuit 22a is variable, to revise the change of (compensation) supply voltage.Particularly, for example, the supply voltage of (before the revisal) is not as V when changing with power supply
0, reference signal is as S
0, and owing to the change of power supply makes supply voltage become V
1The time, then by satisfying for example following formula
V
0/V
1＝k*S
1/S
0 (1)
(in the formula, k is the coefficient of regulation)
Reference signal S
1(reference signal S
0Be modified to reference signal S
1), then the change that (compensation) circuit 34 can be revised (compensation) supply voltage is revised in this power supply change.Therefore, revise (compensation) circuit 34, can revise, make light output more can become certain value the change of source current by this power supply change.Figure 11 be the expression light source portion 10 the light beam sustainment rate the time dependent behavior of lighting a lamp one the example chart.In this example, can use the light source of the time dependent behavior of lighting a lamp (minimizing property) of expression light beam sustainment rate for example shown in Figure 11.Can know that according to Fig. 4 in All Time, the electric power (electric current) that supplies to light source is big more, the light beam sustainment rate just reduces (particularly, among Fig. 4, in the identical time of lighting a lamp, because of current value increases to 20mA～60mA, so the light beam sustainment rate reduces) more.That is, be accompanied by and drop into electric power (electric current) increase (for example, current value increases to 60mA by 20mA), the rate of descent of light beam sustainment rate is increased.
In addition, what can know is, in this example, the electric power (electric current) that supplies to light source increases more, and caloric value just increases more, and temperature on every side just increases more.Therefore, as shown in Figure 4, the light source that has following characteristic through preferred use; Promptly; Follow said working temperature to raise, the light source that electricity-light conversion efficiency reduces is then when said light source is the LED lamp of the formation as as shown in Figure 1; Can suppress employed resin in the LED lamp, for example, contain thermal degradation when resin bed 19 and resin reflecting plate (framework) 18, particularly resin reflecting plate 18, that cause because of the long-term use of said light source of fluorophor.Deterioration takes place when for example, resin reflecting plate 18 makes in its reflecting surface particularly initial stage by flavescence that thermal degradation when caused etc.Therefore, reflectivity descends, the taking-up decrease in efficiency of light.So; The reflecting surface of resin reflecting plate 18 particularly can deterioration in the early stage the time; Because the influence of the pyroconductivity of resin reflecting plate 18 and the difference of the pyroconductivity of the resin bed 19 that contains fluorophor infers that then said reflecting surface can more easily receive the influence that heat is caused.
Figure 12 representes the chart according to the time dependent behavior of lighting a lamp of light output said phenomenon, light source with the mode of pattern.Can know according to Figure 11, if be accompanied by through lighting a lamp the time, when for example initial stage light beam (light output) reduces at 70% o'clock and is set at light source and reaches the life-span; Then previous light source reaches the life-span in time T 1; But in this example, can be at the initial stage of lighting a lamp, for example the light beam of said light source (light output) is set at 70% in advance; Therefore, can the life-span of said light source be extended to T2.
Figure 13 be with the mode of pattern represent to light source input electric power, with the chart of the relation of electricity-light conversion efficiency.Among Figure 13, the situation when solid line representes that working temperature is low, the situation when dotted line representes that working temperature is high.Can know that according to Figure 13 be accompanied by the increase (minimizing) that drops into electric power, electricity-light conversion efficiency reduces (increase), but the low more then conversion efficiency of working temperature is just high more.Therefore, shown in Figure 14, if the working temperature of said light source is suppressed to lower, then said light source itself will demonstrate high light output for a long time, be incorporated into said action effect, can be extended to the T3 longer than T2 the life-span of said light source.
More than, specified the present invention according to said concrete example, but the present invention is not limited to said concrete example, only otherwise break away from category of the present invention, can carry out various distortion or change.
For example, in the said concrete example, mainly be illustrated as light source, can certainly use light source in addition with LED, for example, organic EL.
Claims (5)
1. lighting device is characterized in that it comprises:
Light-emitting diode possesses fluorophor and resin, and has the increase of following input electric power, and the lapse rate of light beam sustainment rate increases, the characteristic that electricity-light conversion efficiency reduces;
Heat-sink unit is arranged on the said light-emitting diode directly or indirectly;
Power supply unit can change the electric power that said light-emitting diode is supplied with; And
Control part suppresses the input electric power to said light-emitting diode in the early stage, follows the process of time, and said input electric power is increased,
Said light-emitting diode is along with the process that adds up the time of lighting a lamp, and the decreasing ratio of said light beam sustainment rate can diminish;
Said control part is based on the electric power of increasing input of the said accumulative total time of lighting a lamp; Control becomes extended immobilizationization from the light output of said light-emitting diode; And when the said accumulative total time of lighting a lamp arrives predetermined value, make and drop into electric power and become certain or the increment rate that drops into electric power is descended.
2. lighting device according to claim 1 is characterized in that:
Said light-emitting diode; Comprise: contain fluorophor resin, have the resin reflecting plate of recess and be configured in the luminescence component in the said recess; And said light-emitting diode possesses: follow the thermal degradation when influence of said resin reflecting plate; Make the lapse rate of light beam sustainment rate increase the characteristic that electricity-light conversion efficiency reduces;
Said control part arrives predetermined value in the decreasing ratio of said light beam sustainment rate, and when having lit a lamp the time to desired accumulative total, makes to drop into electric power and become certain or the increment rate that drops into electric power is descended.
3. according to each described lighting device in the claim 1 to 2, it is characterized in that: constitute said control part, it controls the reference signal of usefulness with the light output that generates said light-emitting diode according to the accumulative total time of lighting a lamp.
4. according to each described lighting device in the claim 1 to 2; It is characterized in that: constitute said control part; It possesses makes the control signal table that adds up the time of lighting a lamp and signal value correspondence, comes the light output of the said light-emitting diode corresponding with said signal value is controlled with the output reference signal.
5. according to each described lighting device in the claim 1 to 2, it is characterized in that: said control part possesses correction portion, and it is revised the output change corresponding with supply voltage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006189881 | 2006-07-10 | ||
| JP2006-189881 | 2006-07-10 | ||
| JP2006189881 | 2006-07-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101106856A CN101106856A (en) | 2008-01-16 |
| CN101106856B true CN101106856B (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101280724A Expired - Fee Related CN101106856B (en) | 2006-07-10 | 2007-07-09 | Lighting apparatus |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1881743A3 (en) |
| JP (1) | JP2013235847A (en) |
| CN (1) | CN101106856B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2461895A (en) * | 2008-07-16 | 2010-01-20 | Elliot Makin | Light emitting diode driver |
| CN102356697B (en) | 2009-03-18 | 2014-05-28 | 株式会社半导体能源研究所 | Lighting device |
| DE102010005743A1 (en) * | 2009-07-09 | 2011-01-13 | Siteco Beleuchtungstechnik Gmbh | LED control |
| WO2011033432A1 (en) * | 2009-09-18 | 2011-03-24 | Koninklijke Philips Electronics N.V. | Lighting module |
| JP5607980B2 (en) * | 2010-04-09 | 2014-10-15 | パナソニック株式会社 | Lighting device, lamp, lighting circuit device, lighting fixture |
| US9807825B2 (en) | 2010-05-18 | 2017-10-31 | Cree, Inc. | Solid state lighting devices utilizing memristors |
| US8710995B2 (en) | 2010-05-20 | 2014-04-29 | Rohm Co., Ltd. | Lighting apparatus |
| CN106471636B (en) * | 2014-06-26 | 2018-09-21 | Nec照明株式会社 | Organic EL panel control device, light supply apparatus, organic EL panel control method, program and recording medium |
| WO2020170421A1 (en) * | 2019-02-22 | 2020-08-27 | 三菱電機株式会社 | Refrigerator |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19540326B4 (en) * | 1995-10-28 | 2006-06-14 | Automotive Lighting Reutlingen Gmbh | Headlights for vehicles |
| DE19818621A1 (en) * | 1998-04-25 | 1999-10-28 | Mannesmann Vdo Ag | Circuit arrangement for adjusting the brightness of current-controlled light-emitting diodes for illuminating a display |
| DE20008346U1 (en) * | 2000-05-09 | 2001-09-20 | Sidler GmbH & Co., 72072 Tübingen | Electrical arrangement with several electrical components |
| US6448716B1 (en) * | 2000-08-17 | 2002-09-10 | Power Signal Technologies, Inc. | Solid state light with self diagnostics and predictive failure analysis mechanisms |
| JP4443853B2 (en) * | 2002-04-23 | 2010-03-31 | 株式会社半導体エネルギー研究所 | LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE USING THE SAME |
| DE20220356U1 (en) * | 2002-06-20 | 2003-06-05 | Insta Elektro GmbH, 58511 Lüdenscheid | Lighting unit comprising light emitting diodes, includes microprocessor and circuitry determining intensity from characteristic curve |
| US7138970B2 (en) * | 2002-12-09 | 2006-11-21 | Lockheed Martin Corporation | Method of LED life extension and end-of-life prediction |
| JP2004327823A (en) * | 2003-04-25 | 2004-11-18 | Nikon Corp | Illuminator, exposure apparatus, and exposure method |
| JP2005005546A (en) * | 2003-06-13 | 2005-01-06 | Hitachi Lighting Ltd | Led lighting device |
| JP4277610B2 (en) * | 2003-07-23 | 2009-06-10 | 豊田合成株式会社 | Light emitting device |
| JP4457110B2 (en) * | 2003-09-24 | 2010-04-28 | パテント−トロイハント−ゲゼルシヤフト フユール エレクトリツシエ グリユーラムペン ミツト ベシユレンクテル ハフツング | Highly efficient lighting system based on LEDs with improved color rendering |
| US7176635B2 (en) * | 2004-02-24 | 2007-02-13 | Musco Corporation | Apparatus and method for compensating for reduced light output of a light source having a lumen depreciation characteristic over its operational life |
| DE102004018343B4 (en) * | 2004-04-15 | 2017-06-14 | Zumtobel Lighting Gmbh | lighting system |
| JP4590994B2 (en) * | 2004-09-09 | 2010-12-01 | 豊田合成株式会社 | Light emitting device and manufacturing method thereof |
-
2007
- 2007-07-09 CN CN2007101280724A patent/CN101106856B/en not_active Expired - Fee Related
- 2007-07-10 EP EP07013491A patent/EP1881743A3/en not_active Withdrawn
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2013
- 2013-07-22 JP JP2013151467A patent/JP2013235847A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP1881743A3 (en) | 2010-04-28 |
| JP2013235847A (en) | 2013-11-21 |
| CN101106856A (en) | 2008-01-16 |
| EP1881743A2 (en) | 2008-01-23 |
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