EP2016803A2 - Schaltungsanordnung und verfahren zur steuerung mindestens einer lichtquelle - Google Patents
Schaltungsanordnung und verfahren zur steuerung mindestens einer lichtquelleInfo
- Publication number
- EP2016803A2 EP2016803A2 EP07724894A EP07724894A EP2016803A2 EP 2016803 A2 EP2016803 A2 EP 2016803A2 EP 07724894 A EP07724894 A EP 07724894A EP 07724894 A EP07724894 A EP 07724894A EP 2016803 A2 EP2016803 A2 EP 2016803A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- light source
- photodetector
- circuit arrangement
- arrangement according
- supply source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical 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]
- H05B45/20—Controlling the colour of the light
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
Definitions
- the present invention relates to a circuit arrangement for controlling at least one light source, a use of the circuit arrangement and a method for controlling at least one light source.
- multiple light sources can be used together, such as a red and a white light emitting diode, abbreviated LED. Also, using three light emitting diodes, one red, one green and one blue LED, for RGB lighting is common. For example, such lighting arrangements serve as backlight for a liquid crystal display.
- lighting arrangements usually provide a plurality of photodetectors, each having different filters.
- the light of a red LED is measured by means of a photodetector covered with a filter layer permeable to a red light.
- a green and a blue LED also photodetectors covered with the corresponding filters are provided. This allows a white balance.
- the object of the present invention is to provide a circuit arrangement and a method for controlling at least one light source, which can be realized cost-efficiently and flexibly. This object is achieved with the subject matter of patent claim 1 and the method according to claim 23. Further developments and refinements are the subject matter of the dependent claims.
- a circuit arrangement for controlling at least one light source comprises a photodetector, a scanning means, a control unit and a first and a second supply source.
- the scanning means is coupled on the input side with the photodetector and on the output side with the control unit.
- the first and the second supply source are each coupled to a control input to a first and second output of the control unit.
- a first light source can be coupled to the first supply source and a second light source can be coupled to the second supply source.
- a photodetector signal is generated by the photodetector and provided to the scanning means.
- the sampling means is for selectively sampling the photodetector signal.
- a signal provided by the scanning means is supplied to the control unit.
- control signals are provided by the control unit, which are supplied to the control inputs of the first and the second supply source.
- the first supply source supplies the first coupling-on light source and the second supply source respectively supplies the second coupling-on light source with electrical energy.
- the circuit arrangement can be realized cost-efficiently, since the first and the second light source are stacked on top of one another. subsequently activated and only if a signal for further processing is provided by the scanning means if only one of the two light sources is activated.
- a single photodetector is sufficient to determine a brightness and / or color or color temperature of the light sources.
- the photodetector does not need a filter with advantage. It is therefore not necessary to adapt a filter located on the photodetector to the changed wavelengths when using light sources having wavelengths other than the wavelengths of the originally provided light sources. This increases the flexibility of the circuit arrangement.
- control unit comprises a first filter, which is coupled on the input side to the scanning means.
- the first filter is coupled on the output side to the first and the second output of the control unit.
- the first filter is connected downstream of the scanning means. This avoids that the photodetector signal generated as a function of the light of the first light source can be influenced by the photodetector signal generated as a function of the light of the second light source.
- the first filter may be connected on the input side to the scanning means.
- the first filter may be formed as a holding member or sample-and-hold member.
- a value may advantageously be held at an output of the first filter until the first filter ter by the next sampling by means of the sampling means fed to another input value and another value is held at the output of the first filter.
- the circuit arrangement comprises a third supply source with an output to which a third light source can be coupled.
- the third supply source is connected to a third output of the control unit.
- the light of the third light source also generates the photodetector signal, which is selectively scanned to detect the photodetector signal produced by the third light source.
- the first filter is coupled on the output side to the third output of the control unit.
- the circuit arrangement has further supply sources, which are each coupled to a control input to a further output of the control unit and each having an output, to each of which a further light source can be coupled, the light also contributes to the photodetector signal.
- the supply sources may each comprise a current source and a switch connected in series with each other.
- the circuit arrangement comprises a sequence controller, which is connected to a control input of the sampling means and to further control inputs of the first, the second and further supply sources.
- the sequencer provides a control signal that in a setting phase, the sequence of activation and deactivation the supply sources and the sampling of the photodetector current controls, so that in a temporal sequence, the brightness values of the light sources are detected and evaluated.
- the control signal is used to synchronize the switches in the supply sources and in the sampling means.
- the sequence control is likewise coupled to the control unit, so that the control signal can likewise be fed to the control unit and serves in the control unit for synchronization of the sampling with further processing of the sampled signals.
- the control unit and the control signals provided by it serve to adjust the brightness of the light sources by setting a parameter of the supply sources in an operating phase.
- the parameter can be a
- the photodetector may be a photoresistor, a photodiode or a phototransistor.
- the photodetector is designed as a photodiode.
- the sampling means comprises in one embodiment a first sampling circuit whose input is coupled to the photodetector and whose output is coupled to the control unit.
- the first sampling circuit is turned on when exactly one of the three light sources is activated.
- the first sampling circuit is associated with the first supply source.
- the sampling means comprises a second sampling circuit, which corresponds to the two th supply source is assigned, and a third sampling circuit, which is associated with the third supply source.
- the first scan circuit is turned on when the first light source is activated.
- the second and the third sampling circuit are turned on when the second and the third light source are activated, respectively.
- the scheduler may be configured to connect to the three supply sources and the three sampling circuits via three bus lines. By means of the first bus line, the first supply source can thus be activated and the first sampling circuit can be switched in passage. Via the second and the third bus line, the second supply source can be activated together with the second sampling circuit or the third supply source together with the third sampling circuit.
- a period of time during which one of the sampling circuits is turned on is less than a period of time during which the corresponding supply source is activated.
- control unit comprises a memory adapted to store a sampled value of the
- Photodetector current is designed for each supply source or a value derived therefrom.
- the memory can also be designed to store a value for each supply source, which is determined by means of the control unit from the respective measured value of the photodetector current and a setpoint value.
- the control unit may comprise an analog circuit.
- the control unit may alternatively or additionally comprise a digital circuit.
- the control unit may additionally comprise a microcontroller.
- a lighting arrangement comprises the circuit arrangement as well as the first and the second light source.
- the first light source is with the first supply source and the second one
- Light source connected to the second supply source.
- a lighting arrangement can be used in a lamp whose brightness and its wavelength characteristic is controlled.
- the lighting assembly may include the third light source connected to the third supply source.
- the control of the supply sources can be used for white balance of the lighting arrangement.
- Such a lighting arrangement is advantageously usable as a backlight for a display such as a liquid crystal display.
- a method for setting at least one light source comprises the following steps: A first and a second light source are activated in succession. A photodetector current associated with one of the respective light sources is measured and sampled. A first and a second supply source provided for providing electrical energy to the first and second light sources, respectively, are controlled in response to the sampled values of the photodetector current.
- the measurement can be carried out with a single photodetector.
- the photodetector current associated with one of the respective light sources is measured, sampled, and filtered. In this case, a filtering of the sampled photodetector current takes place.
- the activation of the light sources and the sampling and measuring takes place in a setting phase.
- Control of the supply sources is carried out in an operating phase.
- the adjustment phase can be done at the beginning of the use of the lighting arrangement. After completion of the adjustment phase, the operating phase follows. After a predefinable period of time can be switched from the operating phase back into the adjustment phase.
- changes that occur in the lighting arrangement due to a temperature or component drift can thus also be compensated by means of the adjustment phases.
- a brightness of one of the light sources can be controlled by adjusting the current output from the respective supply source to the light source.
- the viewer's perceivable brightness of one of the light sources can be controlled by means of pulse width modulation or pulse density modulation of the current provided by the respective supply source of the light source.
- a color characteristic of the lighting arrangement can be adjusted via a current level and / or a duty cycle with which the respective light sources are supplied with electrical energy.
- FIG. 1 shows an exemplary embodiment of a lighting arrangement according to the proposed principle
- FIGS. 2A to 2D show exemplary embodiments of a scanning means and a filter
- FIGS. 3A and 3B show another exemplary embodiment of a lighting arrangement according to the proposed principle
- Figures 4A and 4B show exemplary embodiments of a scanning means.
- FIG. 1 shows an exemplary embodiment of a lighting arrangement according to the proposed principle.
- the illumination arrangement comprises a first, a second and a third light source 10, 12, 14 and a photodetector 2, which is arranged in the illumination arrangement such that light from each of the three light sources 10, 12, 14 can be detected by the photodetector 2.
- the photodetector 2 is designed as a photodiode and connected to the reference potential terminal 8 at a first terminal and to a supply circuit 3 at a second terminal.
- an input of an optional preamplifier 4 is connected.
- a sampling means 6 Connected to an output of the preamplifier 4 is a sampling means 6, to which a control unit 5 is connected downstream.
- the scanning means 6 comprises a first, a second and a third scanning circuit 60, 61, 62 which are connected on the input side to the optional preamplifier 4.
- the control unit 5 comprises a first filter 30, which is connected on the input side to an output of the first sampling circuit 60, and a second and a third filter 31, 32 which are each connected on the input side to an output of the second and the third sampling circuit 61, 62.
- the three filters 30, 31, 32 are coupled to an evaluation circuit 33, which comprises a memory 34.
- the control unit 5 also has a setpoint generator 54, which is connected to the evaluation circuit 33.
- the lighting arrangement furthermore comprises a first supply source 7, which is connected at an output to the first light source 10.
- the first supply source 7 has a switch 81 and a current source 82.
- the first supply source 7 and the first light source 10 form a series circuit, which is connected between a supply voltage connection 9 and the reference potential connection 8.
- the illumination arrangement comprises a second supply source 11 and a third supply source 13, which are each connected at an output to the second light source 12 and the third light source 14.
- the second supply source 11 has a switch 83 and a current source 84.
- the third supply source 13 has a switch 85 and a current source 86.
- the evaluation circuit 33 and thus the control unit 5 are connected to a first, a second and a third output of the control unit 5 via a bus line with a control unit.
- the lighting arrangement furthermore has a sequence controller 16 which has, on the output side, a control terminal of the switch 81 of the first supply source 7, a control terminal of the switch 83 of the second supply source 11 and a control terminal of the switch 85 of the third supply source 13 and the three sampling circuits 60, 61, 62 of the scanning means 6 is connected.
- the illumination arrangement serves for the backlighting of a liquid crystal display 15.
- the liquid crystal display 15 may comprise thin-film transistors, abbreviated TFT.
- the sequence controller 16 provides, on the output side, a control signal sync, which is fed to the first supply source 7 and to the first sampling circuit 60. Due to this control signal sync the first supply source 7 and thus the first light source 10 is activated.
- the light of the first light source 10 is incident on the photodetector 2, so that at the node between the photodetector 2 and the power supply circuit 4 a photodetector signal is present.
- the photodetector signal linl is amplified by means of the optional preamplifier 4, so that a photodetector signal Iin2 is available at the output of the preamplifier 4.
- the photodetector signal Iin2 is supplied to the first, the second and the third sampling circuit 60, 61, 62 on the input side.
- the first sampling circuit 60 is in passage, so that the photodetector signal Iin2 is fed to the first filter 30.
- An output side on the first filter 30 can be tapped off Signal is the evaluation circuit 33 is supplied in which it is compared with a first default value for the first light source 10.
- the first default value is the evaluation circuit 33 provided by the setpoint generator 54.
- a value determined as a function of the signal which can be tapped on the first filter 30 and the first default value is stored in the memory 34.
- the first supply source 7 and the first sampling circuit 60 are deactivated by means of the control signal sync and the second supply source 11 and thus the second light source 12 and the second sampling circuit 61 are activated.
- a light generated by the second light source 12 and impinging on the photodiode 2 leads to a photodetector signal linl and a photodetector signal Iin2 amplified by means of the preamplifier 4.
- the second sampling circuit 61 is connected in passage, so that the photodetector signal Iin2 can be fed to the evaluation circuit 33 via the second filter 31.
- the filtered signal is compared with a setpoint value and a derived signal determined from the comparison is stored in the memory 34.
- the third supply source 13 and thus the third light source 14 and the third sampling circuit 62 are activated by means of the control signal sync.
- the light generated by the third light source 14 is incident on the photodetector 2 and causes the amplified by the preamplifier 4 photodetector signal Iin2, which is fed via the third sampling circuit 62 to the third filter 32.
- a value is formed, which is stored in the memory 34.
- the control unit 5 sends control signals via the bus line to the control inputs of the current sources 82, 84, 86 of the first, second and third supply sources 7, 11, 13, respectively.
- the control signals may be formed depending on the values stored in the memory 34.
- three values of the photodetector signal are generated, which are provided after filtering by means of the first, second and third filters 30, 31, 32 of the evaluation circuit 33, so that in the following operating phase depending on the stored values Setting parameters the three supply sources 7, 11, 13 can be supplied. This is achieved with advantage that the light emitted by the three light sources 10, 12, 14 corresponds to the default values.
- the preamplifier 4 and the supply circuit 3 can be omitted, wherein the photodetector 2 is connected directly between the reference potential terminal 8 and the input of the scanning means 6.
- FIGS. 2A to 2D show exemplary embodiments of a sampling circuit and a filter as can be used in FIG. 1 as first sampling circuit 60 and as first filter 30, as second sampling circuit 61 and as second filter 31 as well as third sampling circuit 62 and third filter 32 ,
- FIG. 2A shows a sampling circuit 60, which is designed as a sample-and-hold circuit and comprises a switch 63.
- the filter 30 is designed as a low-pass filter and comprises an RC element with a resistor 64 and a capacitor 65.
- FIG. 2B shows a sampling circuit comprising the switch 63 and a filter realized by means of an integrator 35.
- the integrator 35 comprises an amplifier 36, a capacitor 37 and a switch 38.
- a first input of the amplifier 36 is connected to the reference potential terminal 8.
- a second input of the amplifier 36 is connected to the switch 63 and via a parallel circuit, which comprises the capacitor 37 and the switch 38, to an output of the amplifier 36.
- the output of the amplifier 36 forms the output of the integrator 35, which is coupled to the evaluation circuit 33 not shown in Figure 2B.
- the switch 63 By closing the switch 38, the capacitor 37 is discharged and the integrator 35 is thus reset.
- the switch 63 When the switch 63 is switched from an open to a closed state by means of the control signal sync, the capacitor 37 is charged by the photodetector current Iin2. A voltage at the output of the integrator 35 is thus proportional to the magnitude of the photodetector current Iin2 and the adjustable duration during which the switch 63 is closed. The voltage is further processed by the evaluation circuit 33.
- the switch 63 can also be closed several times for the predetermined time, so that the voltage at the output of the integrator 35 represents an integrated mean value of the photodetector current Iin2.
- the switch is controlled by the control signal sync provided by the sequencer 14. By means of the control signal sync it is possible to set how many times and for which time period the switch 63 is closed.
- FIG. 2C shows a sampling circuit comprising the switch 63 and a filter having an integrator 35 '.
- the integrator 35 ' includes the amplifier 36, the capacitor 37 and a further capacitor 41 and two switches 39 and 40.
- the integrator 35 ' is designed as a switched capacitor circuit.
- An input of the integrator 35 ' is connected to the output of the switch 63 and the second input of the amplifier 36.
- the first input of the amplifier 36 is connected to the reference potential terminal 8.
- the two switches 39 and 40 are connected in series with the further capacitor 41, wherein the further capacitor 41 between the switch 39 and the switch 40 is arranged.
- This series circuit is connected in parallel with the capacitor 37.
- This parallel connection connects the second input of the amplifier 36 to the output of the amplifier 36, which simultaneously forms the output of the integrator 35 ', which is connected to the evaluation circuit 33.
- the series circuit comprising the further capacitor 41 and the two
- Switch 39, 40 takes over the function of a resistor.
- the switch 39 switches one electrode of the capacitor 41 between the second input of the amplifier 36 and the reference potential terminal 8 and the switch 40 switches another electrode of the capacitor 41 between the output of the amplifier 36 and the reference potential terminal 8. There is always only one of the two electrodes of the capacitor 41 is connected to the reference potential terminal 8.
- the resistance value can be set via the frequency of the changeover.
- FIG. 2D shows a sampling circuit comprising the switch 63 and a filter comprising the integrator 35 ".
- the filter is realized in switched capacitor technology.
- the integrator 35 '' in turn comprises the amplifier 36, the capacitor 37, the switch 38, the further capacitor 41, the switches 39, 40 and a voltage source 42.
- the capacitor 37 and also the switch 38 are between the second Input of the amplifier 36 and the output of the amplifier 36 connected.
- the output of amplifier 36 forms the output of integrator 35 ".
- the first input of the amplifier 36 is connected to the reference potential terminal 8.
- the second input of the amplifier 36 is connected to the voltage source 42 via a series circuit comprising the changeover switch 39, the further capacitor 38 and the changeover switch 40.
- the changeover switch 39 switches over one electrode of the capacitor 41 between the voltage source 42 and the reference potential terminal 8.
- the switch 40 switches another electrode of the capacitor 41 between the second input of the amplifier 36 and the reference potential terminal 8. In this case, only one of the two electrodes of the capacitor 41 is always connected to the reference
- the voltage source 41 provides a set value Vset representing a default value for the associated light source.
- the integrator 35 "thus enables the set value Vset to be subtracted from the photodetector current Iin2.
- a preprocessed signal is already available at the output of the integrator 35 ".
- the filter is thus formed both for integrating the sampled photodetector current Iin2 and for detecting a difference of the sampled photodetector current Iin2 from the set value Vset.
- FIG. 3A shows a further exemplary embodiment of a lighting arrangement.
- the illumination arrangement in FIG. 3A comprises a frequency multiplier 55, which is connected between the sequence controller 16 and the sampling means 6.
- the sampling means 6 comprises the first sampling circuit 60, which comprises the switch 63.
- the control unit 5 according to FIG. 3A comprises an integrator 35 ''', which is designed for the serial processing of a plurality of input signals.
- the integrator 35 '" has the amplifier 36, which is connected to the reference potential terminal 8 at the first input and to the output of the switch 63 at the second input.
- the feedback branch of the amplifier 36 comprises three parallel circuits.
- a first parallel circuit has the capacitor 37 and the switch 38, a second parallel circuit has a capacitor 44 and a switch 45, a third parallel circuit has a capacitor 46 and a switch 47.
- a connection of the three parallel circuits is in each case connected to the second input of the amplifier 36. In each case a further connection of the three parallel circuits is coupled via a changeover switch 43 to the output of the amplifier 36 and thus to the output of the integrator 35 '''. If the first supply source 7 and thus the first light source 10 is activated, the photodetector 2 receives a light signal and provides the photodetector current Iin2. This is sampled, for example, by means of the switch 6 with twice the frequency of the control signal sync 3. During sampling by switch 63, switch 38 is in an open state and switch 43 connects the output of amplifier 36 to the parallel circuit comprising capacitor 37 and switch 38
- the evaluation unit 33 ' is connected at one input to the output of the amplifier 36 and at another input to the sequencer 16. Alternately, the three supply sources 7, 11, 13 are activated and the three condensate sources gates 37, 44, 46 are loaded. The voltage across the three capacitors 37, 44, 46 is thus supplied to the evaluation circuit 33 'in a time-shifted manner and compared therewith with reference values which are provided by the setpoint generator 54. As a function of the comparison results, the three supply sources 7, 11, 13 are controlled in the following operating phase.
- a single amplifier 36 is sufficient for integrating the photodetector current Iin2 with three different values which occur as a function of the three light sources 10, 12, 14.
- the switch 38 in the integrator 35 '' ' may be replaced by the capacitor 41 and the two change-over switches 39, 40, as shown at the top right in FIG. 3A and also in FIG. 2C.
- the two switches 45, 47 can be replaced by two further series circuits, each comprising two switches and one capacitor.
- the lighting arrangement comprises the block shown on the right-hand side of FIG. 3A, framed by a dashed line, which contains the three capacitors 48, 49, 50, the evaluation circuit 33 ",
- Setpoint generator and the switch 51 comprises.
- the output of the integrator 35 '" is connected via the changeover switch 51 to one of the capacitors 48, 49, 50. Since a control input of the switch 51 is coupled to the sequencer 16, the switch 51 is switched in the correct phase so that a signal is present at the capacitor 48 which represents the value of the photodetector current Iin2 which is different from the first light. Source 10 is caused. This is done accordingly for the second and third light sources 12, 14 and the further capacitors 49, 50. Thus, at the input of the control unit 33 "three signals are present in parallel, which represent the three values of the photodetector current Iin2 generated as a function of the three light sources. In this alternative embodiment, the control unit 33 'can be omitted.
- FIG. 3B shows a further exemplary embodiment of a lighting arrangement, which represents a development of the lighting arrangement according to FIGS. 3A and 2D.
- the scanning means 6 comprises the switch 63, which is connected to the sequence controller 16 via the frequency multiplier 55.
- the filter 35 '''' is realized in switched capacitor technology and has the amplifier 36.
- the feedback branch of the amplifier 36 connects the second input of the amplifier 36 to the output of the amplifier 36 and comprises the capacitors 37, 44 and 46, which can be selectively connected via the switch 43 to the output of the amplifier 36.
- the second input of the amplifier 36 is connected via a series circuit, comprising the further capacitor 41 and the two switches 39, 40 and another switch 51, to the voltage source 42, a further voltage source 52 and an additional voltage source 53.
- the three voltage sources 42, 52, 53 represent default values for the first, second and third light sources 10, 12, 14.
- FIGS. 4A and 4B show exemplary embodiments of a scanning means which can be used as first, second and third scanning circuits 60, 61, 63 in FIGS. 1, 2A to 2D, 3A and 3B.
- FIG. 4A shows a scanning means which comprises a switch 63.
- the switch 63 is embodied as a field-effect transistor 70, in particular as an n-channel metal-oxide-semiconductor field-effect transistor, abbreviated n-channel MOS field-effect transistor.
- the field effect transistor 70 may be formed as a p-channel MOS field effect transistor with inverted switching signal.
- FIG. 4B shows a scanning means which comprises a switch 63, which is realized as a transmission gate 71.
- the transmission gate 71 comprises an n-channel MOS field-effect transistor 72, a p-channel MOS field effect transistor 73 and an inverter 74.
- a control terminal of the scanning means is connected to a control terminal of the n-channel MOS field-effect transistor 72 and via the inverter 74 is connected to a control terminal of the p-channel MOS field effect transistor 73.
- a first terminal of the n-channel MOS field-effect transistor 72 is connected to a first terminal of the p-channel MOS field-effect transistor 73.
- n-channel MOS field-effect transistor 72 is connected to a second terminal of the p-channel MOS field-effect transistor 73.
- transmission gate 71 switches with particularly low on-state resistances can be realized.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006020839A DE102006020839B4 (de) | 2006-05-04 | 2006-05-04 | Schaltungsanordnung und Verfahren zur Steuerung mindestens zweier Lichtquellen |
PCT/EP2007/003969 WO2007128528A2 (de) | 2006-05-04 | 2007-05-04 | Schaltungsanordnung und verfahren zur steuerung mindestens einer lichtquelle |
Publications (1)
Publication Number | Publication Date |
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EP2016803A2 true EP2016803A2 (de) | 2009-01-21 |
Family
ID=38564847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07724894A Withdrawn EP2016803A2 (de) | 2006-05-04 | 2007-05-04 | Schaltungsanordnung und verfahren zur steuerung mindestens einer lichtquelle |
Country Status (5)
Country | Link |
---|---|
US (1) | US8344663B2 (de) |
EP (1) | EP2016803A2 (de) |
KR (1) | KR101010380B1 (de) |
DE (1) | DE102006020839B4 (de) |
WO (1) | WO2007128528A2 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7768216B2 (en) | 2006-06-28 | 2010-08-03 | Austriamicrosystems Ag | Control circuit and method for controlling light emitting diodes |
DE102009013897A1 (de) * | 2009-03-19 | 2010-09-23 | Tridonicatco Gmbh & Co. Kg | Schaltung und Beleuchtungssystem zum Dimmen eines Leuchtmittels |
GB2473639A (en) * | 2009-09-18 | 2011-03-23 | Litelogic Ip Ltd | Display with multiple PCBs mounted to bus-bars |
KR20120082206A (ko) * | 2011-01-13 | 2012-07-23 | 삼성모바일디스플레이주식회사 | 광원 구동 회로 및 이를 포함하는 표시 장치 |
FR3011406A1 (fr) * | 2013-09-30 | 2015-04-03 | St Microelectronics Grenoble 2 | Circuit electronique de type analogique comprenant une source auxiliaire de tension |
DE102013113053B4 (de) | 2013-11-26 | 2019-03-28 | Schott Ag | Treiberschaltung mit einer Halbleiterlichtquelle sowie Verfahren zum Betrieb einer Treiberschaltung |
CN106597751A (zh) * | 2017-01-20 | 2017-04-26 | 马跃 | 一种具有宽广色域的液晶显示器及其色温调节方法 |
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DE102021102543A1 (de) * | 2020-02-07 | 2021-08-12 | Analog Devices International Unlimited Company | Transkonduktanzschaltungen und -verfahren |
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JPH09196752A (ja) * | 1995-11-15 | 1997-07-31 | Bunshi Bio Photonics Kenkyusho:Kk | 測光装置 |
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US7135664B2 (en) * | 2004-09-08 | 2006-11-14 | Emteq Lighting and Cabin Systems, Inc. | Method of adjusting multiple light sources to compensate for variation in light output that occurs with time |
DE102004047669A1 (de) * | 2004-09-30 | 2006-04-13 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Beleuchtungseinrichtung und Verfahren zur Regelung |
-
2006
- 2006-05-04 DE DE102006020839A patent/DE102006020839B4/de not_active Expired - Fee Related
-
2007
- 2007-05-04 WO PCT/EP2007/003969 patent/WO2007128528A2/de active Application Filing
- 2007-05-04 US US12/227,027 patent/US8344663B2/en not_active Expired - Fee Related
- 2007-05-04 EP EP07724894A patent/EP2016803A2/de not_active Withdrawn
- 2007-05-04 KR KR1020087028892A patent/KR101010380B1/ko active IP Right Grant
Non-Patent Citations (1)
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See references of WO2007128528A2 * |
Also Published As
Publication number | Publication date |
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KR101010380B1 (ko) | 2011-01-21 |
DE102006020839B4 (de) | 2009-02-19 |
WO2007128528A2 (de) | 2007-11-15 |
WO2007128528A3 (de) | 2008-01-03 |
US20090302769A1 (en) | 2009-12-10 |
DE102006020839A1 (de) | 2007-11-08 |
US8344663B2 (en) | 2013-01-01 |
KR20090035477A (ko) | 2009-04-09 |
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