CN105744675A - Lamp and circuit capable of automatic adjusting color temperature - Google Patents
Lamp and circuit capable of automatic adjusting color temperature Download PDFInfo
- Publication number
- CN105744675A CN105744675A CN201610110489.7A CN201610110489A CN105744675A CN 105744675 A CN105744675 A CN 105744675A CN 201610110489 A CN201610110489 A CN 201610110489A CN 105744675 A CN105744675 A CN 105744675A
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- light
- color
- colour temperature
- divider resistance
- resistance
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates a lamp capable of automatic adjusting color temperature. The lamp comprises a light ray detection unit, a control unit and a light source driving unit, wherein the light ray detection unit is used for detecting intensities of a first color light component and a second color light component in a received reflection light ray, the control unit is used for determining a color temperature adjustment direction according to the intensities of the first color light component and the second color light component, and the light source driving unit is used for driving a light source to increase or reduce the color temperature of lamp light according to the color temperature adjustment direction. By the lamp, the color temperature of lamp light can be automatically adjusted according to the color of paper, the damage of the reflection light ray to a human eye is reduced as well as the reading resolution is ensured.
Description
Technical field
The present invention relates to a kind of lighting, especially relate to a kind of light fixture being automatically adjusted colour temperature and circuit.
Background technology
At present, daily paper using many employings brilliant white coloured paper and the yellowing blank sheet of paper such as books, publication, writing paper.Brilliant white coloured paper adds black word, and writing is clear, and naked eyes easily identify reading, but under light irradiates, brilliant white coloured paper is many to light line reflection, particularly reflects blue light composition in more white light, and human eye is harmful to.Yellowing blank sheet of paper adds black word, and under light irradiates, the light of reflection is less, and in reflected white-light, blue light composition also reduces, and to a certain degree decreases the injury to human eye, but yellowing paper reduces with blackness handwriting resolution, and the resolution of writing is also declined by human eye therewith.The injury to human eye because different paper color and lusters brings can be improved by regulating the light fixture colour temperature used, reduce light colour temperature when brilliant white paper, during yellowing paper, suitably increase light colour temperature, can ensure that writing reduces clearly to human eye injury simultaneously.Existing light fixture can remove to regulate the attribute of light by button or remote control, and such as colour temperature, brightness etc., but user does not often know that great colour temperature is suitable, cannot accurately regulate suitable colour temperature when reading the paper of different colours.
Summary of the invention
The technical problem of colour temperature cannot be automatically adjusted according to paper color and luster in order to solve light fixture of the prior art, the invention provides and a kind of can automatically identify paper color and luster and regulate the light fixture of colour temperature, circuit and method, while taking into account reading definition, reduce the light infringement to human eye.
The technical scheme is that
A kind of light fixture being automatically adjusted colour temperature, detects unit, control unit, light source driving units including light, and described light detection unit is for detecting the intensity of the first color and the second color light component in the reflection light received；According to the intensity of described first color and the second color light component, described control unit determines that colour temperature regulates direction；Described light source driving units drives light source to improve for regulating direction according to described colour temperature or reduces the colour temperature of light.
In addition, present invention also offers a kind of circuit being automatically adjusted colour temperature, first photoconductive resistance L1 one end and system VCC connect, other end connects the first divider resistance R1, and it is connected to the ADC channel AIN0 of MCUU1, first divider resistance R1 other end meets GND, and the first photoconductive resistance L1 sensitive surface covers Red lightscreening plate；Second photoconductive resistance L2 one end and system VCC connect, and other end connects the second divider resistance R2, and are connected to the ADC channel AIN1 of MCUU1, and the second divider resistance R2 other end connects GND, L2 sensitive surface and covers green color filter；Current-limiting resistance R3 one end connects high color temperature LED LEDD1 supply voltage VIN, and one end connects LED anode, and D1 negative electrode connects driving audion Q1 colelctor electrode, and Q1 base stage connects the PWM passage 1 being simultaneously connected with U1 of pull down resistor R5；Current-limiting resistance R4 one end connects low color temperature light emitting diode LEDD2 supply voltage VIN, and one end connects LEDD2 anode, and D2 negative electrode connects driving audion Q2 colelctor electrode, and Q2 base stage connects the PWM passage 0 being simultaneously connected with U1 of pull down resistor R6.
Compared with prior art, the present invention can be automatically adjusted the colour temperature of light fixture light according to paper color and luster so that reflection light colour temperature decreases the reflection light infringement to human eye while ensureing to read definition.
Accompanying drawing explanation
Fig. 1 is the structure chart that light fixture colour temperature of the present invention regulates；
Fig. 2 is that the present invention is from changing the simplified electrical circuit diagram regulating one embodiment of colour temperature light fixture.
Detailed description of the invention
In order to principles of the invention and technical scheme are described, it is described in detail below in conjunction with accompanying drawing.Example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
The invention provides a kind of light fixture being automatically adjusted colour temperature according to paper color and luster, as shown in Figure 1, including light sensing unit, control unit, light source driving units, light sensing unit receives the light that paper reflection is returned, the filtered intensity extracting different light component, control unit determines the adjustment direction of light source color temperature according to the intensity of the light component extracted, and the intensity of the colour temperature adjustment direction adjustment light source that light source driving units is determined according to control unit regulates the colour temperature of light.Sensitivity according to the light component that light sensing unit extracts, it is preferred that also include signal amplification unit, is amplified the intensity of the light component obtained according to setting ratio.
Specifically, Fig. 2 illustrates that the present invention is automatically adjusted the simplified electrical circuit diagram of colour temperature light fixture one of which embodiment.According to Fig. 2, light sensing unit includes the first photoconductive resistance L1 and the second photoconductive resistance L2, first photoconductive resistance L1 sensitive surface covers Red lightscreening plate, second photoconductive resistance L2 sensitive surface covers green color filter, and filtered of the light that paper reflection is returned obtains red light component and green light components after filtering；Signal amplification unit includes the first divider resistance R1 and the second divider resistance R2, and red light component and green light components obtain the first divider resistance R1 and the voltage U of the second divider resistance R2 respectively after the first divider resistance R1 and the second divider resistance R2 amplifiesR1And UR2；MCU control unit is according to the first divider resistance R1 voltage U sensedR1Voltage U with the second divider resistance sensingR2Calculate the ratio P of red light component and green light components, and with the reference value P set0Compare, it is determined that the adjustment direction of colour temperature.If P is more than P0, illustrating that red component proportion is more than benchmark ratio, current colour temperature is partially warm, need to improve the colour temperature of output light source；If P is less than P0, illustrating that red component proportion is less than benchmark ratio, current colour temperature is colder, need to reduce the colour temperature of output light source；If P is equal to P0, illustrate that current light colour temperature is suitable, it is not necessary to light source is adjusted.In the present embodiment, light source is made up of high color temperature LED and low color temperature light emitting diode, when needs improve light colour temperature, can pass through increase the intensity of high color temperature LED and reduce the intensity of low color temperature light emitting diode, mixed by the light of different proportion and improve light colour temperature, until the ratio P of the red light component detected and green light components reaches benchmark ratio P0In time, stops.Specifically, the present embodiment circuit implementations is as follows:
Photoconductive resistance L1 one end and system VCC connect, and other end connects the first divider resistance R1, and ADC channel AIN0, the R1 other end being connected to MCUU1 connects GND, L1 sensitive surface and covers Red lightscreening plate；Photoconductive resistance L2 one end and system VCC connect, and other end connects the second divider resistance R2, and ADC channel AIN1, the R2 other end being connected to MCUU1 connects GND, L2 sensitive surface and covers green color filter；Current-limiting resistance R3 one end connects high color temperature LED LEDD1 supply voltage VIN, and one end connects LEDD1 anode, and D1 negative electrode connects driving audion Q1 colelctor electrode, and Q1 base stage connects the PWM passage 1 being simultaneously connected with U1 of pull down resistor R5；Current-limiting resistance R4 one end connects low color temperature light emitting diode LEDD2 supply voltage VIN, and one end connects LEDD2 anode, and D2 negative electrode connects driving audion Q2 colelctor electrode, and Q2 base stage connects the PWM passage 0 being simultaneously connected with U1 of pull down resistor R6.
In the present embodiment, photoconductive resistance is only one of which implementation, and those skilled in the art also can be replaced with the light-sensitive device such as light sensitive diode, phototriode.
Further, the first divider resistance R1 and the second divider resistance R2 is adjustable resistance, it is possible to the value adjusting two divider resistance R1 and R2 regulates dividing ratios, and then balances the diversity of light-sensitive device and cause that influence value deviation is big.
Further, switching device Q1, the Q2 of the present embodiment is contained for switching device, it is possible to for audion, FET, MOSFET etc..
Further, the LED drive part of the present embodiment is only used as just to set forth the technology of the present invention principle, is not limited to the present invention, and scope should contain all LED drive patterns, and such as DC-DC constant-current driving, DC-DC constant voltage drives, linear constant current etc..
For principle that the present invention realize is described in detail, illustrate below in conjunction with embodiment illustrated in fig. 2.White light comprises the red, green, blue of equivalent, and namely the red, green, blue mixing of equivalent is namely in white light, and the colour temperature of white light is about about 5400K.If the red color light component contained by a certain light source is many, its colour temperature is lower than 5400K, as tengsten lamp colour temperature be about 2800K；If blue light ingredient contained by a certain light source is many, its colour temperature is higher than 5400K.When light fixture is incident upon on brilliant white paper with 5400K colour temperature light, owing to brilliant white paper has white full range luminous reflectance, the amount by the HONGGUANG of Red lightscreening plate with by the green glow of green color filter is of substantially equal.When light fixture is incident upon on yellowing blank sheet of paper with 5400K colour temperature light, owing to the sodium yellow composition of yellowing blank sheet of paper reflection is more, by the amount light of Red lightscreening plate more than by the amount light of green color filter.When light fixture is to be incident upon on brilliant white paper lower than 5400K colour temperature light, owing in low colour temperature light, HONGGUANG composition is more, bigger than by the amount light of green color filter by the amount light of Red lightscreening plate.When light fixture is to be incident upon on yellowing blank sheet of paper lower than 5400K colour temperature light, due to yellowing blank sheet of paper have reflection sodium yellow composition many, compared with white paper, bigger than by the amount light of green color filter by the amount light of Red lightscreening plate.It follows that when same light is irradiated on the paper of different color and luster, the HONGGUANG in reflection light is different from the ratio of green glow, and colour temperature is also different；When different light are irradiated on the paper of same color and luster, the HONGGUANG in reflection light is also different from the ratio of green glow, and namely colour temperature is different.By pass through amount light red, green color filter can obtain red light and green light in reflection light number, the colour temperature direction of reflection light can be reflected by calculating the ratio of red light quantity and green light quantity in reflection light.From the above analysis, determine that the factor of reflection light color temperature includes color and luster and irradiation light light color temperature two aspect of reflecting surface and paper.Can presetting the color temperature benchmark value that a best applicable human eye is read by experiment, namely red light is than the ratio P of green light0。
After opening light source, when detecting that in reflection light, the ratio of red light and blue ray is more than the benchmark ratio P set0Time, illustrating to increase the colour temperature irradiating light, light fixture light colour temperature, reducing red light component, until detecting that HONGGUANG reaches color temperature benchmark value P than the ratio of green glow0Till；In like manner, when detecting that in reflection light, the ratio of red light and blue ray is less than the benchmark ratio P set0Time, illustrating to reduce the colour temperature irradiating light, light fixture light colour temperature, increasing red light component, until detecting that HONGGUANG reaches color temperature benchmark value than the ratio value of green glow.System is fed back to a degeneration factor from detecting, according to default reference value P0, can progressively adjust the colour temperature of light fixture light by pid algorithm until what detect reflects the color temperature benchmark value P that the ratio of HONGGUANG and blue light in light reaches to set0Till.
In the embodiment shown in Figure 2, UR1For the voltage of the sensing of divider resistance R1, UR2For the voltage of divider resistance R2 sensing, P is UR1/UR2Value, P0For reference value.When light fixture is irradiated on the paper of different color and luster, when detecting that P is more than P0Time, it is meant that red component proportion is more than benchmark, and colour temperature is partially warm, and control unit MCUU1 controls PWM1 and increases, and improves the brightness of high color temperature diode D1, increases cool colour, and ratio reduces PWM0 simultaneously, reduces warm colour proportion, until detecting that P is equal to P0；In like manner, when detecting that P is less than P0Time, it is meant that red component proportion is less than benchmark, and colour temperature is colder, and control unit MCUU1 controls PWM1 and reduces, and reduces cool colour, and ratio increases PWM0 simultaneously, improves the brightness of warm colour diode D2, improves warm colour proportion, until detecting that P is equal to P0.As can be seen here, when on light fixture light-illuminating to the paper of different colours, the light fixture of the present invention can be automatically adjusted the colour temperature of light so that paper reflection both ensure that the definition of reading to the light of human eye, also protects the vision of human eye.
Preferably, the light fixture of the present invention is properly applied to the occasion such as desk lamp, filing cabinet.
The foregoing is only several embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. can being automatically adjusted a light fixture for colour temperature, detect unit, control unit, light source driving units including light, described light detection unit is for detecting the intensity of the first color and the second color light component in the reflection light received；According to the intensity of described first color and the second color light component, described control unit determines that colour temperature regulates direction；Described light source driving units drives light source to improve for regulating direction according to described colour temperature or reduces the colour temperature of light.
2. light fixture according to claim 1, it is characterized in that: described light detection unit includes the first light-sensitive device, the second light-sensitive device, described first light-sensitive device sensitive surface covers the first color filter, and described second light-sensitive device sensitive surface covers the second color filter.
3. light fixture according to claim 2, it is characterised in that: described light-sensitive device is photoconductive resistance, light sensitive diode or phototriode.
4. light fixture according to claim 2, it is characterised in that: described first color filter is Red lightscreening plate, and described second color filter is green color filter.
5. light fixture according to claim 1 and 2, it is characterised in that: also including signal amplification unit, described signal amplification unit is for amplifying the intensity of light component.
6. light fixture according to claim 5, it is characterized in that: described signal amplification unit includes the first divider resistance R1, the second divider resistance R2, described first divider resistance is connected with described first light-sensitive device, and described second divider resistance is connected with described second light-sensitive device.
7. light fixture according to claim 1, it is characterised in that: described control unit calculates the ratio P of described first color light component and described second color light component, by with benchmark ratio P0 relatively determine that colour temperature regulates direction.
8. light fixture according to claim 1, it is characterised in that: lamp light source is made up of high color temperature LED and low colour temperature LED, and described light source driving units regulates the colour temperature of light by adjusting the mixed proportion of described high color temperature LED light and low colour temperature LED light.
9. light fixture according to claim 8, it is characterised in that: LED drive pattern is DC-DC constant-current driving, DC-DC constant voltage drives or linear constant current drives.
10. the circuit being automatically adjusted colour temperature, first photoconductive resistance L1 one end and system VCC connect, and other end connects the first divider resistance R1, and is connected to the ADC channel AIN0 of MCUU1, first divider resistance R1 other end meets GND, and the first photoconductive resistance L1 sensitive surface covers Red lightscreening plate；Second photoconductive resistance L2 one end and system VCC connect, and other end connects the second divider resistance R2, and are connected to the ADC channel AIN1 of MCUU1, and the second divider resistance R2 other end connects GND, L2 sensitive surface and covers green color filter；Current-limiting resistance R3 one end connects high color temperature LED LEDD1 supply voltage VIN, and one end connects LED anode, and D1 negative electrode connects driving audion Q1 colelctor electrode, and Q1 base stage connects the PWM passage 1 being simultaneously connected with U1 of pull down resistor R5；Current-limiting resistance R4 one end connects low color temperature light emitting diode LEDD2 supply voltage VIN, and one end connects LEDD2 anode, and D2 negative electrode connects driving audion Q2 colelctor electrode, and Q2 base stage connects the PWM passage 0 being simultaneously connected with U1 of pull down resistor R6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610110489.7A CN105744675B (en) | 2016-02-29 | 2016-02-29 | A kind of light fixture and circuit for automatically adjusting colour temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610110489.7A CN105744675B (en) | 2016-02-29 | 2016-02-29 | A kind of light fixture and circuit for automatically adjusting colour temperature |
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| CN105744675A true CN105744675A (en) | 2016-07-06 |
| CN105744675B CN105744675B (en) | 2018-02-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108626683A (en) * | 2018-03-23 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of colour temperature for RGB laser headlamps detects feedback device |
| CN109509438A (en) * | 2018-12-28 | 2019-03-22 | 惠科股份有限公司 | Backlight drive component, backlight module and display device |
| CN110996468A (en) * | 2019-12-27 | 2020-04-10 | 科大讯飞股份有限公司 | Dimming method and device, dimming system and storage medium |
| CN111988531A (en) * | 2019-05-21 | 2020-11-24 | 北京小米移动软件有限公司 | Light supplementing module, light supplementing control method of light supplementing module, terminal and device |
| CN112020173A (en) * | 2019-05-29 | 2020-12-01 | 广东小天才科技有限公司 | Light adjusting method and intelligent desk lamp |
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| CN103857096A (en) * | 2012-11-28 | 2014-06-11 | 胡能忠 | Optimal vision illumination device and method for the same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626683A (en) * | 2018-03-23 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of colour temperature for RGB laser headlamps detects feedback device |
| CN109509438A (en) * | 2018-12-28 | 2019-03-22 | 惠科股份有限公司 | Backlight drive component, backlight module and display device |
| CN111988531A (en) * | 2019-05-21 | 2020-11-24 | 北京小米移动软件有限公司 | Light supplementing module, light supplementing control method of light supplementing module, terminal and device |
| CN112020173A (en) * | 2019-05-29 | 2020-12-01 | 广东小天才科技有限公司 | Light adjusting method and intelligent desk lamp |
| CN110996468A (en) * | 2019-12-27 | 2020-04-10 | 科大讯飞股份有限公司 | Dimming method and device, dimming system and storage medium |
| CN110996468B (en) * | 2019-12-27 | 2022-05-17 | 科大讯飞股份有限公司 | Dimming method and device, dimming system and storage medium |
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| CN105744675B (en) | 2018-02-06 |
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