CN107969038B - Photographic lamp and control method - Google Patents
Photographic lamp and control method Download PDFInfo
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- CN107969038B CN107969038B CN201711146503.XA CN201711146503A CN107969038B CN 107969038 B CN107969038 B CN 107969038B CN 201711146503 A CN201711146503 A CN 201711146503A CN 107969038 B CN107969038 B CN 107969038B
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- 239000011324 bead Substances 0.000 claims description 39
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000003086 colorant Substances 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 7
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- 230000009286 beneficial effect Effects 0.000 description 1
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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
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Abstract
The invention discloses a photographic lamp, comprising: the first sensor module is used for acquiring ambient light data of an external environment; the analog lamp group is used for performing analog output according to the ambient light data; the second sensor module is used for acquiring analog output light data of the analog output of the analog lamp group; and the control module is respectively connected with the actual output lamp group, the analog lamp group, the first sensor module and the second sensor module in a signal manner and is used for controlling the actual output lamp group to output according to the analog output light data. According to the invention, the first sensor module is used for collecting real-time ambient light data, the analog lamp group is used for carrying out real-time analog output, and the second sensor module is used for collecting real-time analog output light data, so that the control module can control the output of the actual output lamp group in real time according to the analog output light data, and the output light of the actual output lamp group is more stable and accurate.
Description
Technical Field
The invention relates to the field of LED lamps, in particular to a photographic lamp and a control method.
Background
Various LED photographic lamps appear in the market at present, and basically can realize color temperature and brightness adjustment. However, there is a general problem in that the color temperature is greatly deviated from the actual color temperature, and the reason for such deviation is that their LED lamps are an open loop control system.
An open loop control system is a control system in which the input signal is not affected by the output signal, i.e. the result of the control is not fed back to affect the current control system. In contrast, the closed-loop control system comprises the following specific contents: and (3) a part or all of the output quantity of the control system is returned to the input end of the system through a certain method and device, feedback information is compared with the original input, and the comparison result is applied to the system for control so as to avoid the system from deviating from a preset target.
The closed loop system uses negative feedback, and an automatic control system of a closed loop is formed by a signal forward path and a feedback path, which is also called a feedback control system.
Because the adjustable LEDs in the market adopt an open loop control system, the output light is not fed back in real time, and errors are caused when the incoming materials of the LED lamp beads are different (wavelength, luminous intensity and the like) or the temperature of the LED lamp beads rises, the actual output light is greatly deviated from a theoretical value, and the deviation from a preset target is reflected in the aspects of insufficient color temperature precision or white light color cast and the like.
Disclosure of Invention
The present invention is directed to a photographic lamp and a control method thereof, which address the above-mentioned drawbacks of the prior art.
The invention adopts the technical proposal that a photographic lamp is designed, which comprises: the first sensor module is used for acquiring ambient light data of an external environment; the analog lamp group is used for performing analog output according to the ambient light data; the second sensor module is used for acquiring analog output light data of the analog output of the analog lamp group; and the control module is respectively connected with the actual output lamp group, the analog lamp group, the first sensor module and the second sensor module in a signal manner and is used for controlling the actual output lamp group to output according to the analog output light data.
Preferably, the control module includes: the main control unit and the signal conversion unit, the analog lamp group is coupled to the signal conversion unit through a first constant current source module, and the actual output lamp group is coupled to the signal conversion unit through a second constant current source module. The signal conversion unit converts the digital signal of the main control unit into an analog signal so that the first constant current source module and the second constant current source module drive the analog lamp group and the actual output lamp group to output.
Preferably, the actual output lamp set and the analog lamp set are composed of a substrate and LED lamp beads with different colors distributed on the substrate in groups. The LED lamp beads of different colors in each group are the light-emitting units of the actual output lamp group and the analog lamp group, and the parameters of the output light of the photographic lamp are adjusted by adjusting the parameters of the LED lamp beads of different colors in each group.
Preferably, the number of the LED lamp beads of the actual output lamp group is greater than the number of the LED lamps of the analog lamp group. The actual output lamp set needs to output the external photographing environment, so that more LED lamp beads are needed; the analog lamp group is used for analog output, so that only a small number of LED lamp beads are needed.
Preferably, the output power of the actual output light group is larger than the output power of the analog light group. The actual output lamp group with larger output power makes the output effect of the photographic lamp more obvious.
A control method of a photographic lamp is designed, the control method comprising the steps of: acquiring ambient light data of an external environment through a first sensor module; according to the external ambient light data, performing simulation output through the simulation lamp group; obtaining analog output light data of analog output of the analog lamp group through a second sensor module; and adjusting the output data of the actual output light according to the analog output light data to control the actual output lamp group to output. The ambient light data of the external environment obtained through the first sensor module can be input into the control module as an input value for storage, the control module outputs a control signal to control the analog lamp group to perform analog output, the second sensor module obtains analog output light data of the analog lamp group to be output in real time, the analog output light data is input into the control module for analysis and processing, and a control signal is output to control and adjust the output light of the actual output lamp group, so that a closed loop feedback system is formed.
Preferably, the step of performing analog output according to external ambient light data includes: analog output is performed by a set of analog lamps disposed within the photography luminaire. The simulated lamp group is arranged in the photographic lamp, so that the influence of ambient light on the output light of the simulated lamp group can be reduced, and the appearance and the use of the photographic lamp can not be influenced.
Preferably, the step of acquiring analog output light data of an analog output includes: and the analog sensor is used for acquiring analog output light data on the analog lamp group. The analog sensor collects analog output light data on the analog lamp set in real time, and inputs the collected analog light data on the analog lamp set into the control module.
Preferably, the step of adjusting the output data of the actual output light according to the analog output light data further includes: after the analog output light data is obtained, the output data of the actual output light is adjusted according to the difference data of the actual output light group of the photographic light and the analog light group. The control module analyzes and compares the analog output light data with the ambient light data, and adjusts the actual output lamp set according to the comparison result.
Preferably, the control method further comprises the steps of: the first constant current source module is coupled to the analog lamp group for outputting; the second constant current source module is coupled to the actual output lamp group for output; the first constant current source module and the second constant current source module are coupled to the same control module.
Compared with the prior art, the invention has at least the following beneficial effects: according to the invention, the first sensor module is used for collecting real-time ambient light data, the analog lamp group is used for carrying out real-time analog output, and the second sensor module is used for collecting real-time analog output light data, so that the control module can control the output of the actual output lamp group in real time according to the analog output light data, and the output light of the actual output lamp group is more stable and accurate.
Drawings
Fig. 1 is a system diagram of an embodiment of the present invention.
Fig. 2 is a block connection diagram according to an embodiment of the present invention.
FIG. 3 is a flow chart of an embodiment of the present invention.
Wherein: 1. the control module, 11, the main control unit, 12, the signal conversion unit, 2, the first sensor module, 3, the second sensor module, 4, the actual output lamp group, 5, the analog lamp group, 6, the second constant current source module, 61, the second white light driving circuit, 62, the second red light driving circuit, 63, the second green light driving circuit, 64, the second blue light driving circuit, 7, the first constant current source module, 71, the first white light driving circuit, 72, the first red light driving circuit, 73, the first green light driving circuit, 74, the first blue light driving circuit.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 and 2, the present invention proposes a photographic lamp, comprising: a first sensor module 2 for acquiring ambient light data of an external environment; the analog lamp group 5 is used for performing analog output according to the ambient light data; a second sensor module 3, configured to obtain analog output light data that is analog output by the analog lamp set 5; the control module 1 is respectively connected with the actual output lamp set 4, the analog lamp set 5, the first sensor module 2 and the second sensor module 3 in a signal manner, and is used for controlling the actual output lamp set 4 to output according to the analog output light data.
The first sensor module 2 and the second sensor module 3 are composed of an RGB sensor or a tristimulus value XYZ sensor and a surrounding circuit, the RGB sensor or the tristimulus value XYZ sensor detects RGB parameters or tristimulus value XYZ parameters of light, and feeds back the RGB parameters or the tristimulus value XYZ parameters of light to the control module 1.
Of course, the first sensor module 2 and the second sensor module 3 may also be sensors for detecting other parameters of the light, such as a photosensor for detecting the brightness of the light, etc.
In an embodiment of the present invention, the control module 1 includes: the main control unit 11 and the signal conversion unit 12, the analog lamp set 5 is coupled to the signal conversion unit 12 through the first constant current source module 7, and the actual output lamp set 4 is coupled to the signal conversion unit 12 through the second constant current source module 6. The signal conversion unit 12 converts the digital signal of the main control unit 11 into an analog signal so that the first constant current source module 7 and the second constant current source module 6 drive the analog lamp set 5 and the actual output lamp set 4 to output.
The main control unit 11 is a micro control unit formed by a main control chip and peripheral circuits, and is a control hub of the whole photographic lamp system, the main control unit 11 sends out instructions to control various modules, and then various modules control sub-modules of the photographic lamp system. The main control unit 11 outputs a PWM control signal.
The signal conversion unit 12 is a PWM-to-DAC element, and can convert the PWM digital signal output by the main control unit 11 into an analog signal of voltage for the first constant current source module 7 and the second constant current source module 6.
In the embodiment of the present invention, the actual output light set 4 and the analog light set 5 are composed of a substrate and LED light beads of different colors distributed on the substrate in groups. The LED lamp beads of different colors in each group are the light-emitting units of the output lamp group and the simulation lamp group 5, and the parameters of the output light of the photographic lamp are adjusted by adjusting the parameters of the LED lamp beads of different colors in each group.
The LED lamp beads of each group of different colors are preferably four-color LED lamp beads of R (red light), G (green light), B (blue light) and W (white light). The white light LED lamp beads are main luminous lamp beads, the red light, green light and blue light LED lamp beads are adjustable mixed light LED lamp beads, and the mixed light LED lamp beads are used for adjusting the color temperature of the photographic lamp.
Specifically, when the light output of the white light LED lamp beads is fixed, the output of the red light LED lamp is increased, and the output of a proper amount of green light LED lamp beads is increased, so that the color temperature of the light output by the photographic lamp can be reduced; similarly, when the light output of the white light LED lamp beads is fixed, the output of the blue light LED lamp is increased, and the output of a proper amount of green light LED lamp beads is increased, so that the color temperature of the output light of the photographic lamp can be increased.
In addition, the light emitting units of the actual output light set 4 and the analog light set 5 may also be two-color lamps, wherein the two-color lamps are composed of a low color temperature light bulb and a high color temperature light bulb, and the low color temperature light bulb and the high color temperature light bulb are LED light bulbs. The color temperatures of the actual output lamp set 4 and the simulation lamp set 5 are adjusted by adjusting the low-color temperature LED lamp beads and the high-color temperature LED lamp beads, so that the color temperature of the photographic lamp is adjusted. Specifically, the output of the low-color-temperature LED lamp beads is increased, so that the color temperature of the photographic lamp can be reduced; and the color temperature of the photographic lamp can be increased by increasing the output of the high-color-temperature LED lamp beads.
In the embodiment of the present invention, the number of the LED lamps of the actual output lamp set 4 is greater than the number of the LED lamps of the analog lamp set 5. The actual output light set 4 needs to output the external photographing environment, so that more LED light beads are needed; the analog light group 5 is used for analog output, so that only a small number of LED light beads are needed.
The substrate size of the actual output light set 4 is also larger than the size of the analog light set 5, and the number of groups of the LED lights distributed on the actual output light set 4 is also larger than the number of groups of the LED lights distributed on the analog light set 5.
In the embodiment of the present invention, the output power of the actual output light set 4 is greater than the output power of the analog light set 5. The actual output light set 4 with the larger output power makes the output effect of the photographic light more obvious. The actual output lamp set 4 and the analog lamp set 5 do not share a constant current source module, and the output power is different, and because the LED lamp beads are different when leaving the factory, correction is needed, correction data are solidified into the main control unit 11, and the main control unit 11 only needs to collect and adjust the output light of the analog lamp set 5, so that the actual output lamp set 4 can keep synchronous output.
In addition, the first constant current source module 7 includes: a first white light driving circuit 71 for driving white light LED beads on the analog lamp set 5, a first red light driving circuit 72 for driving red light LED beads on the analog lamp set 5, a first green light driving circuit 73 for driving green light LED beads on the analog lamp set 5, and a first blue light driving circuit 74 for driving blue light LED beads on the analog lamp set 5; meanwhile, the second constant current source module 6 includes: the second white light driving circuit 61 for driving the white light LED beads on the actual output light set 4, the second red light driving circuit 62 for driving the red light LED beads on the actual output light set 4, the second green light driving circuit 63 for driving the green light LED beads on the actual output light set 4, and the second blue light driving circuit 64 for driving the blue light LED beads on the actual output light set 4.
In addition, the control module 1, the analog lamp set 5 and the second sensor module 3 are integrated in a control box, and the first sensor module 2 and the actual output lamp set 4 are disposed outside the control box.
As shown in fig. 3, there is also provided a control method of a photographic lamp, the control method including the steps of: acquiring ambient light data of an external environment through the first sensor module 2; analog output is carried out through the analog lamp group 5 according to external ambient light data; obtaining analog output light data which is output in an analog way by the analog lamp group 5 through the second sensor module 3; and adjusting the output data of the actual output light according to the analog output light data to control the actual output lamp group 4 to output. The ambient light data of the external environment obtained by the first sensor module 2 can be used as an input value to be input into the control module 1 for storage, the control module 1 outputs a control signal to control the analog lamp set 5 to perform analog output, the second sensor module 3 obtains analog output light data of the analog output of the analog lamp set 5 in real time, the analog output light data is input into the control module 1 for analysis and processing, and the control signal is output to control and adjust the output light of the actual output lamp set 4, so as to form a closed loop feedback system.
In an embodiment of the present invention, the step of performing analog output according to external ambient light data includes: the analog output is performed by a set of analog lamps 5 provided in the photographic lamp. The setting of the analog lamp set 5 in the photography luminaire can reduce the influence of the ambient light on the output light of the analog lamp set 5, and the appearance and the use of the photography luminaire are not affected.
In addition, the step of performing analog output according to the external ambient light data may be performing analog output by using a computer, where the computer obtains the external ambient light data collected by the first sensor module 2 to simulate the output of the external ambient light.
In an embodiment of the present invention, the step of obtaining analog output optical data of an analog output includes: by providing an analog sensor for obtaining analog output light data on the analog light bank 5. The analog sensor collects analog output light data on the analog lamp set 5 in real time, and inputs the collected analog light data on the analog lamp set 5 into the control module 1.
In addition, if the external ambient light is simulated by using a computer, the data of the simulated output light can be directly obtained, and the data of the simulated output light can be input into the control module 1.
In an embodiment of the present invention, the step of adjusting the output data of the actual output light according to the analog output light data further includes: after the analog output light data is acquired, the output data of the actual output light is adjusted according to the difference data of the actual output light group 4 of the photographing light and the analog light group 5. The control module 1 analyzes and compares the analog output light data with the ambient light data, and adjusts the actual output light group 4 according to the comparison result.
Specifically, if the output data of the output light of the actual output light group 4 is X, and the output data of the output light simulated by the simulated light group 5 according to the ambient light data is X-1, the control module 1 adjusts the actual output light to X-1.
In an embodiment of the present invention, the control method further includes the steps of: coupled to the analog lamp set 5 for output by the first constant current source module 7; coupled to the actual output lamp group 4 for output by the second constant current source module 6; the first and second constant current source modules 7, 6 are coupled together to the same control module 1.
The above examples are only for illustrating specific embodiments of the present invention. It should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit of the invention, and these modifications and variations should be considered to be within the scope of the invention.
Claims (10)
1. A photographic lamp, comprising:
the first sensor module is used for acquiring ambient light data of an external environment;
the simulation lamp set is used for carrying out simulation output on external ambient light according to the ambient light data;
the second sensor module is used for acquiring analog output light data of the analog output of the analog lamp group;
and the control module is respectively connected with the actual output lamp group, the analog lamp group, the first sensor module and the second sensor module in a signal manner and is used for controlling the actual output lamp group to output according to the analog output light data.
2. The photography luminaire of claim 1, wherein the control module comprises: the main control unit and the signal conversion unit, the analog lamp group is coupled to the signal conversion unit through a first constant current source module, and the actual output lamp group is coupled to the signal conversion unit through a second constant current source module.
3. The photographic lamp of claim 1, wherein the actual output light set and the analog light set are composed of a substrate and LED light beads of different colors distributed on the substrate in groups.
4. The photographic lamp of claim 3, wherein the actual output light set has a greater number of LED light beads than the analog light set.
5. The photographic lamp of claim 4, wherein the actual output lamp set has an output power greater than the output power of the analog lamp set.
6. A control method of a photographic lamp, characterized by comprising the steps of:
acquiring ambient light data of an external environment through a first sensor module;
according to the external environment light data, the external environment light is simulated and output through the simulation lamp group;
obtaining analog output light data of analog output of the analog lamp group through a second sensor module;
according to the analog output light data, the output data of the actual output light is adjusted to control the actual output lamp group to output;
the photographic lamp includes: the device comprises a first sensor module, an analog lamp set, a second sensor module and a control module.
7. The method of controlling a photographic lamp as claimed in claim 6, wherein the analog output of the external ambient light through the analog lamp set according to the external ambient light data comprises:
analog output is performed by a set of analog lamps disposed within the photography luminaire.
8. The method of controlling a photographic lamp as claimed in claim 6, wherein the step of acquiring analog output light data of the analog output includes:
and the analog sensor is used for acquiring analog output light data on the analog lamp group.
9. The method of controlling a photographic lamp as claimed in claim 6, wherein the step of adjusting output data of actual output light based on the analog output light data further comprises:
after the analog output light data is obtained, the output data of the actual output light is adjusted according to the difference data of the actual output light group of the photographic light and the analog light group.
10. The method for controlling a photographic lamp as claimed in claim 9, wherein,
the first constant current source module is coupled to the analog lamp group for outputting;
the second constant current source module is coupled to the actual output lamp group for output;
the first constant current source module and the second constant current source module are coupled to the same control module.
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| CN201711146503.XA CN107969038B (en) | 2017-11-17 | 2017-11-17 | Photographic lamp and control method |
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| CN201711146503.XA CN107969038B (en) | 2017-11-17 | 2017-11-17 | Photographic lamp and control method |
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| CN207638935U (en) * | 2017-11-17 | 2018-07-20 | 深圳市爱图仕影像器材有限公司 | A kind of photography luminaire |
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| US20050174473A1 (en) * | 1999-11-18 | 2005-08-11 | Color Kinetics, Inc. | Photography methods and systems |
| US9041697B2 (en) * | 2011-01-28 | 2015-05-26 | Broadcom Corporation | Apparatus and method for using an LED for backlighting and ambient light sensing |
| EP2774459B1 (en) * | 2011-11-03 | 2021-01-06 | Digital Lumens Incorporated | Methods, systems, and apparatus for intelligent lighting |
| US9345091B2 (en) * | 2013-02-08 | 2016-05-17 | Cree, Inc. | Light emitting device (LED) light fixture control systems and related methods |
| CN103582257A (en) * | 2013-11-03 | 2014-02-12 | 胡军 | LED driving device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104541578A (en) * | 2012-03-19 | 2015-04-22 | 数字照明股份有限公司 | Methods, systems, and apparatus for providing variable illumination |
| CN102789170A (en) * | 2012-07-26 | 2012-11-21 | 中国科学院长春光学精密机械与物理研究所 | On-track continuously focusing closed-loop dynamic simulation test method for astronautic optical remote sensor |
| CN104633499A (en) * | 2015-02-04 | 2015-05-20 | 余建华 | LED light source module with high color rendering index and LED lamp |
| CN207638935U (en) * | 2017-11-17 | 2018-07-20 | 深圳市爱图仕影像器材有限公司 | A kind of photography luminaire |
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