CN1826513A - Method and device for measuring color temperature - Google Patents
Method and device for measuring color temperature Download PDFInfo
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- CN1826513A CN1826513A CNA2004800210343A CN200480021034A CN1826513A CN 1826513 A CN1826513 A CN 1826513A CN A2004800210343 A CNA2004800210343 A CN A2004800210343A CN 200480021034 A CN200480021034 A CN 200480021034A CN 1826513 A CN1826513 A CN 1826513A
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- 239000011159 matrix material Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
- G01D3/024—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation for range change; Arrangements for substituting one sensing member by another
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
- G01J1/14—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means using comparison with a surface of graded brightness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature
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- Optics & Photonics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
A method for measuring a color temperature (TC) of a light source (2) comprises the steps of: measuring the partial intensity of one predefined blue spectral conpponent (B); measuring the luminance (V); and calculating the quotient BN as representing the color temperature (TC). The color temperature (TC) is calculated on the basis of a predetermined relationship between the color temperature (TC) and the quotient BN. Sensor assembly capable of generating a measuring signal containing information regarding the color temperature of a light source. Switch stage for cooperation with a sensor assembly. Driver for during a lamp with variable color temperature properties. Lamp system comprising a lamp, a sensor assembly and a lamp driver.
Description
Technical field
On the one hand, present invention relates in general to a kind of method and apparatus that is used for the colour temperature of measurement light source.More particularly, the present invention relates to be used to drive the actuator device of light source with variable colour temperature.
Background technology
Usually, there is demand to the method and apparatus of the colour temperature that is provided for measurement light source.The colour temperature of light source can be defined as the temperature that its black matrix must have, and makes in chromaticity diagram (chromaticity disgram) its color dot near the color dot of this light source.Therefore, the method for traditional measurement colour temperature comprises at first measures color dot, calculates the step in the closest approach on black body-line then.First shortcoming of this classic method is that this calculating is quite complicated.The color dot of light source has three coordinate x usually, and y is given in the space of z, x=X/ (X+Y+Z) wherein, and y=Y/ (X+Y+Z), z=Z/ (X+Y+Z), X wherein, Y and Z represent the absolute strength of specific predetermined spectral components.Measure this three coordinate x, in fact the direct mode of y and z relates to the intensity of measuring three correspondences, and this relates to three color sensors of use, and each sensor comprises corresponding chromatic filter and light intensity detector.This color sensor is quite expensive.
A kind of more economic method of measuring color dot is based on such fact, promptly every resolution, x+y+z=1.Therefore, it only measures two coordinate x and y and calculates the 3rd coordinate according to z=1-x-y just enough.This still relates to two color sensors of use.An example according to the method and apparatus of this principle is disclosed in DE-4421919.
Fundamental purpose of the present invention provides a kind of more economic mode of measurement light source colour temperature.
One specific aspect, the present invention relates to a kind of gas-discharge lamp that is used for, particularly HID lamp, more particularly the actuator device of metal halide lamp.Typical lamp driver comprises and produces the level that is essentially steady current, after connect commutator, the electric current of the described lamp that is used to commutate promptly changes sense of current in the described lamp regularly.Routinely, this commutator is with the operation of 50% duty cycle, and promptly in each current cycle, electric current equals the duration of electric current to flow in the other direction from the duration that an electrode flows to another electrode.Among patent application PCT/IB03/01547 in early days, this application has been described the gas-discharge lamp with variable color attribute.By changing the duty cycle of average lamp current, particularly this lamp current, colour temperature can change in wider temperature range; According to the potpourri that lamp is filled, described temperature range can expand to about 6000K from about 2500K.
In principle, between duty cycle and colour temperature, there is man-to-man relation.Having a problem is exactly that this relation can not show as invariable in time.Therefore, if plan to keep color temperature constant, it is not enough keeping duty cycle constant.
A specific purpose of the present invention addresses this problem exactly.
One specific aspect, the present invention relates to send two measuring-signals to treatment circuit.Usually, this needs three lines, line of each measuring-signal, and a common ground.Each line all relates to the cost of distribution and related connector.In addition, utilize every line, increased the complexity of assembling and the time of assembling.
Further purpose of the present invention is to reduce then this problem.
Summary of the invention
According to an important aspect of the present invention, provide a kind of method that is used to measure colour temperature, wherein measured absolute strength and whole light intensity or the brightness V of predetermined blue color spectrum component B, and calculated merchant B/V.This method presents the comprehension that almost has linear relationship with colour temperature based on described merchant B/V, only relates to a relatively costly color sensor and a relatively cheap luminance sensor (being light intensity sensor).The further advantage of this method is whole light intensity, and it typically is an emerging true parameter of important sense, also is directly available; In classic method, whole light intensity must indirectly determine, perhaps if directly definite, also needs other detecting device.
According to another important aspect of the present invention, a kind of light source that is used for is provided, the driver of gas-discharge lamp particularly, comprise the sensor module that is used to produce the measuring-signal of representing colour temperature, this measuring-signal is fed the controller to driver, and is in fact invariable thereby it is designed to adjust its setting maintenance colour temperature.Advantageously, this sensor module comprises blue sensor and luminance sensor, allows controller to determine the B/V ratio.
According to another important aspect of the present invention, the sensor module that comprises two sensor diode is provided, each sensor diode be connected in series the mutual inverse parallel connection of these two tandem arrangements at corresponding in the other direction booster diode.The supply voltage that has first polarity when application produces the electric current of the measuring-signal of this first sensor diode of indication during to this assembly.When this supply voltage had reversed polarity, described electric current was indicated the measuring-signal of another sensor diode.
Description of drawings
These and other aspect of the present invention, feature and advantage explain further with reference to the description of the drawings that by following identical reference marker is indicated same or analogous part in the accompanying drawing, and wherein:
Accompanying drawing 1 is the structural drawing that schematically shows according to actuator device of the present invention;
Accompanying drawing 2 is the charts that schematically illustrate as the lamp current of the function of time;
Accompanying drawing 3 is the charts that schematically illustrate as the colour temperature of the function of duty cycle;
Accompanying drawing 4 is the structural drawing of preferred embodiment that schematically illustrate some assembly of lamp driver;
Accompanying drawing 5 is to schematically illustrate the chart that concerns between B/V and the colour temperature;
Accompanying drawing 6 is the structural drawing of preferred embodiment that schematically illustrate some assembly of lamp driver.
Embodiment
Accompanying drawing 1 is the structural drawing that schematically illustrates according to the preferred embodiment of actuator device of the present invention or electric ballast 10, and this actuator device or electric ballast 10 are used for driving the gas-discharge lamp 2 of the lamp system 1 with variable color attribute.The present invention will explain that ballast resistor 10 wherein typically comprises the embodiment with lower member:
Be used to receive the input 11 of ac power cable;
Be used for the AC power supplies voltage commutation is the rectifier 12 of the dc voltage of rectification;
DC/DC up converter 13 is used for converting the power supply dc voltage of rectification to higher dc voltage, and is used to carry out power factor correction;
And commutator 15, be used for that (commutation cycle) changes this DC sense of current regularly in the very short time.
Yet, should be noted that this ballast resistor also can have different designs.
Low-converter shows as current source.Typically, this commutator is approximately being operated on the frequency about 50-400Hz.Therefore, in principle, this lamp operates in the steady current size, and the electric current of lamp is (commutation cycle) regular its direction of change in the very short time, be that electrode is operated in the first of each current cycle as negative electrode, in the remainder manipulate of each current cycle as anode.This is by accompanying drawing 2 explanations, and accompanying drawing 2 is for schematically showing the electric current I through lamp 2 as the function of time
LChart.In current period P, electric current I
LAt very first time interval t
1Flow to another electrode from the electrode of a lamp, at second time interval t
2Flow by opposite direction, wherein P=t
1+ t
2Duty cycle D is defined as D=(t
1/ P) 100%.In current cycle P, the electric current I of lamp
LHave constant size, but change direction.Greater than the hour range of current cycle the time, average current I
AVCan be defined as (t
1-t
2)/I
L/ P.Routinely, driver is designed such that its output can be considered to constitute and has the alternating current direction but current source with steady current size, has 50% duty cycle; In the case, average current I
AVBe zero.
The HID light fixture of some type has colour temperature T
CAs average current I
AVFunction be variable attribute, it can change by changing duty cycle D, as explanation more perfect in PCT/IB03/01547, it is inserted in this as a reference.When being given as, the electric current of lamp is different from zero average current I
AVThe time, move the distribution that causes particle in the lamp, in the lamp of some type, can cause the variation of colour temperature.Therefore, driver 10 can drive and have variable average lamp current I
AVLamp 2.
In implementing a kind of possible scheme of the present invention, average current I
AVBe different from zero, because strength of current is different from strength of current in negative current period in positive current period, electric current can have 50% duty cycle in this case.Yet such embodiment is not what suit, and a reason is the size of current of lamp in half current cycle, and promptly strength of current is not constant in time.Because light intensity and strength of current are proportional, this can cause lamp not conform to the flicker of demand.Another reason is will realize that this method is quite difficult in existing design of Driver.
Below, will be described in more detail the present invention at the preferred embodiments of the invention, avoided described defective in the present invention, in addition, the present invention is easier to realize by appropriate software or hardware modification in existing lamp driver.Yet, should be noted that the positive current size is different mutually with the negative current size can to obtain same or analogous result by making.
In this preferred embodiment, duty cycle is different from 50%, and it is constant that strength of current always keeps, promptly at current cycle (t
1) lamp current magnitude in " just " half period equals current cycle (t
2) " bearing " half period in size of current (referring to accompanying drawing 2).
Therefore, according to a preferred aspect of the present invention, driver 10 is designed to have adaptable duty cycle.
Usually, colour temperature T
CAnd the relation between the duty cycle D is described as Fig. 3, and wherein transverse axis is represented duty cycle, and Z-axis is represented colour temperature.
The exact value of colour temperature depends on the accurate potpourri that lamp is filled.
Have been found that D and T
CBetween to tie up in life-span of lamp be not constant in the pass.In order to address this problem, driver 10 comprises optical sensor components 20, near lamp 2 configurations, is used for receiving the sensor signal S (T that light also produces the information that includes the colour temperature of closing light from lamp 2
C).
Lamp driver can be designed for a relevant specific colour temperature setting of type with specific lamp, but typically lamp driver will allow the user that specific colour temperature is set.For this reason, controller 50 has first user and imports 54, is used to receive the first user control signal S
U1Color signalization as user's generation.Driver 10 also comprises control setting equipment 57, pot for example, generation can be in preset range the continually varying first user control signal S
U1This control setting equipment 57 can be that the user is controlled, but it also can be the controller that is fit to programming.
Preferably, and as shown in Figure 1, controller 50 also has deepening equipment, promptly is used to be provided with the equipment of the light intensity that is produced by lamp 2.For this reason, controller 50 has second user and imports the 55 and second control output 53.Import 55 its second user, controller 50 receives the second user control signal S
U2Intensity signalization as user's generation.Driver 10 comprises that also intensity is provided with equipment 58, pot for example, generation can be in preset range the continually varying second user control signal S
U2It can be that the user is controlled that intensity is provided with equipment 58, but it also can be the controller that is fit to programming.In its second control output 53, controller 50 produces and is used for downconverter 14 control lamp current I
LThe intensity control signal S of size
I
In principle, sensor module 20 can be any suitable sensor module that can produce enough measuring-signals of the information that comprises relevant colour temperature and light intensity.A preferred embodiment of this sensor module 20 is shown in the schematic configuration diagram of accompanying drawing 4, and it has preferably been considered relatively simply and relative low cost.This preferred sensor assembly 20 comprises two optical sensors 21 and 22.The all responsive brightness that also produces the described light of expression of 21 pairs of all visible lights of first sensor, i.e. the first sensor signal S of the total intensity in the visual range of described spectrum
VThis first sensor also will be represented as luminance sensor below 21, and it will be represented as luminance signal below sensor signal.Second sensor 22 is only to sensitive to blue light, and generation expression blue light quantity, the i.e. second sensor signal S of the part intensity in the blue spectrum of described spectrum
BThis second sensor also will be represented as blue sensor below 22, and it will be represented as blue signal below sensor signal.In this regard, " blue light " will be understood that to have the light that arrives the wavelength in the scope of about 480nm at about 380nm.Preferably, 22 pairs of range-sensitive that are actually whole blueness of blue sensor.Should be noted that blue sensor 22 there is no need all wavelengths in its sensitive range is all had identical susceptibility; Usually, sensor has sensitivity maximum at a wavelength, and along with the increase susceptibility from the distance of this wavelength descends, will be apparent from as those skilled in the art.Blue sensor 22 has the narrower sensitive range of any wavelength in the blue spectrum.Preferably, this blue sensor 22 approximately has most sensitive about 440nm.
In fact the measurement input end 51 of controller 50 comprises two input end 51a and 51b, and first input end is used to receive luminance signal S
V, second input end is used to receive blue signal S
BLuminance signal S
VCan use in the simple directly mode of control light intensity.Controller 50 comprises first comparer 60, has one and receives luminance signal S
VInput, and have reception with reference to light intensity signal REF
LAnother input.This can be to import 55 user input signals that receive the user with reference to light intensity signal, or is stored in the reference value in the storer 56.Comparator output signal is coupled to the second control output 53 of controller 50.
This controller 50 also comprises divider 70, has to be coupled to be used to receive luminance signal S
VWith blue signal S
BController two inputs of measuring input end 51a and 51b.This divider 70 is configured to by luminance signal S
VRemove blue signal S
B, and produce corresponding to S
B/ S
VOutput signal B/V.Controller 50 comprises second comparer 71, has an input that receives divider output signal B/V, and has reception with reference to colour signal REF
CAnother input.This can be to import the 54 first user input signal SU that receive first user with reference to colour signal
1, or be stored in reference value in the described storer 56.Comparator output signal is coupled to the first control output 52 of controller 50, both can directly also can be coupled by pulse producer 72 in an example shown, and this pulse producer 72 produces to be respectively applied for determines the first duty cycle time interval t
1The duration and the second duty cycle time interval t
2The sprocket pulse of duration.
Constant by keeping the B/V ratio to be actually, controller 50 has guaranteed that described colour temperature keeps constant in fact, as represented by accompanying drawing 5 based on being the discovery of well representing the parameter of colour temperature to B/V.Accompanying drawing 5 is experiment with measuring results of the relation between expression relevant B/V (Z-axis) and the colour temperature TC (transverse axis).
In order to transmit sensor signal to treatment circuit, in preferred an enforcement as shown in Figure 6, only need two lines from two sensor devices.
In the preferred embodiment, two sensors 21 and 22 each be implemented as photodiode.First photodiode 21 is connected in series with first booster diode 23 in the other direction, and second diode 22 is connected in series with second booster diode 24 in the other direction.The electrode of the free time of first photodiode 21 is connected to the electrode of the free time of second booster diode 24, and this node is connected to first output terminal 25 of sensor module 20, and the electrode of the free time of second photodiode 22 is connected to the electrode of the free time of first booster diode 23, and this node is connected to second output terminal 26 of sensor module 20.In the case, each diode that is connected in series 21,23 and 22,24 has the anode that links together, so each diode has the negative electrode that is connected to output terminal, and described diode can have inverted direction.The order of the diode during simultaneously, each is connected in series can be put upside down.
Switching stage 90 comprises three switches 82,83,84.{ 84} has center switch end (82c) [83c] { 84c}, first switch terminals (82a) [83a] { 84a}, and second switch end (82b) [83b] { 84b} to each switch (82) [83].Controller 50 has switch control output 98, produces the switch controlling signal S of the mode of operation that is used for gauge tap 82,83,84
CSUnder first mode of operation, { 84} makes its central switch terminals (82c) [83c], and { 84c} is connected to its first switch terminals (82a) [83a] { 84a} to each switch (82) [83].Under second mode of operation, { 84} makes its central switch terminals (82c) [83c], and { 84c} is connected to second switch end (82b) [83b] { 84b} to each switch (82) [83].
First switch 82 makes its central switch terminals 82c be connected to the first input end 91a of switching stage 90, and first input end 91a is connected to first output terminal 25 of sensor module 20.Second switch 83 makes its central switch terminals 83c be connected to the second input end 91b of switching stage 90, and it is connected to second output terminal 26 of sensor module 20.The 3rd switch 84 makes its central switch terminals 84c be connected to the output terminal 99 of switching stage 90.
The first switch terminals 82a of first switch 82 and the second switch end 83b of second switch 83 are connected to reference voltage V
CCThe first switch terminals 83a of the second switch end 82b of first switch 82 and second switch 83 is respectively by corresponding resistor R 1 and R2 ground connection.The first switch terminals 84a of the 3rd switch 84 is connected to the first input end 91a of switching stage 90, and the second switch end 84b of the 3rd switch 84 is connected to the second input end 91b of switching stage 90.
Described operation is as follows.Under first mode of operation, the negative electrode of the first sensor diode 21 and second booster diode 24 is connected to reference voltage, and the negative electrode of second sensor diode 22 and first booster diode 23 is connected to the second measurement resistor R2.Second booster diode 24 blocks any electric current by second sensor diode 22.First sensor diode 21 produces sensor current based on the light quantity that receives by first sensor diode 21, and this electric current flow among the second measurement resistor R2, produces voltage at these second resistor R, 2 two ends.Provide this voltage as output signal at output terminal 99, reflection is from the measuring-signal of first sensor diode 21.
Under second mode of operation, situation is opposite, and the voltage that produces by the first measurement resistor R21 two ends, and reflection is from the measuring-signal of second sensor diode 22, and provides as output signal at output terminal 99.
Should be noted that measuring-signal B and V are subjected to the influence of the resistance value of R1 and R2.Because controller 50 only keeps B/V than constant, the exact value of B and V, and the exact value of R1 and R2 is unessential.Even do not need controller 50 to understand which signal indication S
B, which signal indication S
VAfter all, controller 50 whether be designed to keep B/V than or V/B than constant be unessential.In fact, if every resolution V/B is than keeping constant, it is constant that B/V also can keep, and can think that therefore measuring B/V equals to measure V/B.With reference to the embodiment of accompanying drawing 4, those skilled in the art will be apparent from needs for which modification.
On the other hand, to understand which signal be which to controller if desired, thereby for example control whole light intensity because controller 50 is suitable for controlling the strength of current of lamp, as shown in Figure 4, can select the value of measurement resistor R1 and R2, thus S
VAlways than S
BHeight, vice versa, and in the case, it is that the relative size of first and second measuring-signals is given described controller 50 required relevant which signal for which information.Yet, suitably select the resistance value of measurement resistor R1 and R2 to need the knowledge of relevant sensor characteristic.
Also can be that controller 50 is designed to carry out sensor identification test.This test relates to the setting (briefly) that intentionally changes driver, thereby increases the relative populations of (or minimizing) blue light; For example, this driver setting can be configured to the value that its relative populations of knowing blue light is maximum (or minimum).By monitoring the response of this sensor signal, controller 50 can determine which sensor is a blue sensor.
It should be apparent to those skilled in the art that the present invention is not limited to the exemplary embodiments of above argumentation, but in the protection scope of the present invention that in claims, defines various changes and modification can be arranged.
For example, the present invention not only can be applied to gas-discharge lamp and HID lamp.In the light source of other types, it also can be by changing the variation (for example TL lamp) that controlled variable realizes colour temperature.In the case, the driver that is used for control light source on the basis of measuring-signal of expression B/V also is useful.And it also is useful that the sensor module that is proposed by the present invention is connected with two-wire.
In addition, though in described embodiment, in order to keep color temperature constant, it is just enough to measure B/V, in fact also can obtain the value of colour temperature itself.For example, controller 50 can have look-up table or formula, based on the measurement result shown in the accompanying drawing 5, thereby in a single day determines the B/V ratio, and T can be retrieved or calculate to controller 50 just
C
In addition, replace using blue light, also can use light from the different wavelength range in the visual range.As a fit closely alternative scope, mentioned the red light scope, i.e. scope from about 610nm to about 760nm.
In addition, with reference to accompanying drawing 6, described a kind of favourable sensor module, it has two sensors that produce two measuring-signals, only needs to be connected to two signal paths (line) of signal processor.In described embodiment, this sensor also can be photosensitive photodiode.Yet the measurement principle that relates in sensor module is not limited to diode: also can use the light sensitive device of other type, for example photo-resistor (LDRs).The measurement principle that relates in sensor module even be not limited to measuring light: the design of sensor module can be used the sensor of any kind of a certain parameter sensitivity is used, thereby at least one electrical characteristics, for example the electric current (photodiode) of resistance between two sensor side (LDR) or generation depends on this parameter.This sensor module comprises the diode that is connected with this sensor series connection: therefore, produce measuring-signal (electric current) when only using the voltage with correct polarity when being connected in series by this; When opposite polarity, series diode will block any measuring-signal from its relevant sensor.This sensor module also comprises second diode (it needn't have identical type with first sensor: the parameter that measure also can be different fully) that is connected in series with second sensor second.Second is connected in series is connected with first inverse parallel that is connected in series, and relates to the direction of diode.
In addition, with reference to accompanying drawing 6, relative positive voltage V
CCWith ground switching stage 90 is described.Yet, also can use negative reference voltage.Simultaneously, measuring resistance can be connected in series with reference voltage and replace earth terminal.
More than, invention has been described for reference structure figure, and described structural drawing has illustrated the functional block according to equipment of the present invention.Be to be understood that the one or more functional blocks in these functional blocks can realize with hardware, wherein the function of this functional block can be carried out by each hardware component, but the one or more functional blocks in these functional blocks also can realize with software, thereby the function in these functional blocks is by the one or more program lines or for example execution such as microprocessor, microcontroller, digital signal processor of programmable device of computer program.
Claims (24)
1. be used for the method for the colour temperature (TC) of measurement light source (2), may further comprise the steps:
The part intensity (B) of the predetermined SPECTRAL REGION that measurement is narrower than visible range;
Measure the total intensity (V) in the visible range; And
Calculate the ratio (B/V) of described part intensity (B) with the described total intensity (V) of expression colour temperature (Tc).
2. method according to claim 1, wherein colour temperature (Tc) is calculated on this colour temperature (Tc) and described basis than the predetermined relationship between (B/V).
3. method according to claim 1, wherein said predetermined SPECTRAL REGION is positioned at the blue portion of spectrum.
4. method according to claim 3, wherein said blue spectrum extends to about 480nm from about 380nm.
5. method according to claim 1, wherein said predetermined SPECTRAL REGION is positioned at the red part of spectrum.
6. method according to claim 5, wherein said red color range extends to about 760nm from about 610nm.
7. sensor module (20) is used to measure at least one parameter, comprising:
First parameter sensors (21) has the electrical characteristics of at least one parameter correlation;
First diode (23) is connected in series with described first parameter sensors (21).
8. sensor module according to claim 7, wherein said first parameter sensors (21) is an optical sensor, preferably photodiode.
9. sensor module according to claim 7 is used for measuring at least two parameters, also comprises:
Second parameter sensors (22) has the electrical characteristics of at least one parameter correlation;
Second diode (24) is connected in series with described second parameter sensors (22);
Wherein the tandem compound of second parameter sensors (22) and second diode (24) is connected with the tandem compound inverse parallel of first parameter sensors (21) with first diode (23).
10. sensor module according to claim 7, wherein the free time of first parameter sensors (21) holds and is coupled to first output terminal (25);
And wherein the free time of first diode (23) holds and is coupled to second output terminal (26).
11. sensor module (20) can receive light (L) from light source (2), and can produce the measuring-signal (S (Tc)) of the information of the colour temperature (Tc) that comprises relevant this light source (2);
This sensor module (20) comprises the first sensor (21) that is suitable for measuring brightness and is suitable for measuring second sensor (22) of the part intensity of the predetermined SPECTRAL REGION narrower than visible range.
12. sensor module according to claim 11, wherein said second sensor (22) has the sensitive range that corresponds essentially to blue spectrum, and described second sensor (22) preferably has the most sensitive that is approximately 440nm.
13. sensor module according to claim 11, the sensitive range that wherein said second sensor (22) has the red color range of corresponding essentially to, described second sensor (22) preferably has the most sensitive that is approximately 660nm.
14. sensor module according to claim 11, design according to Claim 8.
15. switching stage (90) is used for and sensor module cooperation according to claim 10, this switching stage comprises:
First gate-controlled switch (82), have the central authorities' ends (82c) that are coupled to first input (91a), have first end (82a) that is coupled to first reference voltage (Vcc), and have by first measurement resistor (R1) be coupled to second reference voltage that is different from first reference voltage (Vcc) () second end (82b);
Second gate-controlled switch (83), have the central authorities' ends (83c) that are coupled to second input (91b), have first end (83b) that is coupled to first reference voltage (Vcc), and have by second measurement resistor (R2) be coupled to second reference voltage that is different from first reference voltage (Vcc) () second end (83a);
The 3rd gate-controlled switch (84), (84c) holds in the central authorities with output of being coupled to (99), has first end (84a) that is coupled to second input (91b), and has second end (84b) that is coupled to first input (91a).
16. be used to drive the driver (10) of the lamp (2) with variable colour temperature attribute, this driver comprises:
Sensor module (20) can receive light (L) from light source (2), and can produce the measuring-signal (S (Tc)) of colour temperature (Tc) information that comprises relevant this light source (2);
Controller (50) has coupling with the input (51) from sensor module (20) reception measuring-signal (S (Tc)), and is suitable for control generation component (14 on the basis of this measuring-signal (S (Tc)); 15) lamp current.
17. driver according to claim 16, wherein this controller (50) is designed to keep described measuring-signal (S (Tc)) at desirable value.
18. driver according to claim 16, wherein this controller (50) comprising:
Divider (70), its input connects the strength signal (SB) that is used to receive luminance signal (Sv) and indicates the part intensity (B) of the predetermined SPECTRAL REGION narrower than visible range;
Comparer (71) has first input that receives output signal (B/V) from described divider (70), and has reception reference signal (REF
c) second the input.
19. driver according to claim 18 also comprises having the pulse producer (72) that receives the input of output signal from described comparer (71).
20. driver according to claim 18 comprises sensor module according to claim 11 (20).
21. driver according to claim 16, wherein said controller (50) comprising:
Comparer (60), it has first input that connection is used to receive luminance signal (Sv), and has reception reference signal (REF
L) second the input.
22. driver according to claim 16 comprises switching stage according to claim 15 (90).
23. driver according to claim 22 comprises sensor module according to claim 10 (20).
24. lamp system (1) comprising:
Lamp (2) with variable colour temperature attribute;
Sensor module according to claim 11;
Lamp driver according to claim 16.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03102249.4 | 2003-07-22 | ||
| EP03102249 | 2003-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1826513A true CN1826513A (en) | 2006-08-30 |
Family
ID=34072670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004800210343A Pending CN1826513A (en) | 2003-07-22 | 2004-07-12 | Method and device for measuring color temperature |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1660850A2 (en) |
| JP (1) | JP2006528346A (en) |
| CN (1) | CN1826513A (en) |
| WO (1) | WO2005008196A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674689B (en) * | 2008-09-11 | 2013-01-30 | 谢婉毓 | Color temperature controller of light-emitting diodes (LED) and color temperature controlling method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005045569A1 (en) * | 2005-05-31 | 2006-12-07 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Charging capacitor charging device for operation of discharge lamp, has controller calculating switching time of switch for observation of reference values in real time, and controlling switch to calculated switching time for switching |
| US7678422B2 (en) | 2006-12-13 | 2010-03-16 | Air Products And Chemicals, Inc. | Cyclic chemical vapor deposition of metal-silicon containing films |
| DE102008020382A1 (en) * | 2008-04-23 | 2009-11-12 | Chromasens Gmbh | LED line light |
| US8022631B2 (en) | 2008-11-03 | 2011-09-20 | General Electric Company | Color control of light sources employing phosphors |
| US8823396B2 (en) * | 2013-01-11 | 2014-09-02 | Nokia Corporation | Apparatus and associated methods |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039824A (en) * | 1974-08-08 | 1977-08-02 | Minolta Camera Kabushiki Kaisha | Focus detecting photoelectric device |
| US4222663A (en) * | 1977-08-01 | 1980-09-16 | United Technologies Corporation | Optical pyrometer and technique for temperature measurement |
| US4758734A (en) * | 1984-03-13 | 1988-07-19 | Nec Corporation | High resolution image sensor array using amorphous photo-diodes |
| NL9001302A (en) | 1989-06-30 | 1991-01-16 | Philips Nv | SWITCHING DEVICE. |
| DE4013422C2 (en) * | 1990-04-26 | 2000-02-03 | Roland Man Druckmasch | Illumination device for a three-area color measuring device |
| US5302883A (en) * | 1992-10-23 | 1994-04-12 | Industrial Technology Research Institute | Automated apparatus and method for the reproduction of same color temperature luminous intensity standard light source |
| JPH06351038A (en) * | 1993-06-10 | 1994-12-22 | Matsushita Electric Ind Co Ltd | Auto-white balance device |
| DE4421919A1 (en) | 1994-06-24 | 1996-01-04 | Karl Gerhard | Colour temp. constancy checking appts. for light source e.g. commercial or laboratory fluorescent lamp |
| US5581077A (en) * | 1994-07-05 | 1996-12-03 | Lucent Technologies Inc. | Optical receiver with a high impedance preamplifier |
-
2004
- 2004-07-12 JP JP2006520948A patent/JP2006528346A/en active Pending
- 2004-07-12 WO PCT/IB2004/051196 patent/WO2005008196A2/en active Application Filing
- 2004-07-12 EP EP04744555A patent/EP1660850A2/en not_active Withdrawn
- 2004-07-12 CN CNA2004800210343A patent/CN1826513A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674689B (en) * | 2008-09-11 | 2013-01-30 | 谢婉毓 | Color temperature controller of light-emitting diodes (LED) and color temperature controlling method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1660850A2 (en) | 2006-05-31 |
| WO2005008196A2 (en) | 2005-01-27 |
| WO2005008196A3 (en) | 2005-05-12 |
| JP2006528346A (en) | 2006-12-14 |
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