CN103025007B - Street lamp illuminating device - Google Patents
Street lamp illuminating device Download PDFInfo
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- CN103025007B CN103025007B CN201210506860.3A CN201210506860A CN103025007B CN 103025007 B CN103025007 B CN 103025007B CN 201210506860 A CN201210506860 A CN 201210506860A CN 103025007 B CN103025007 B CN 103025007B
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- resistance
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- 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
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides street lamp illuminating device, comprise power supply and LED display device.LED display device comprises: constant-current source, LED group, variable resistance, voltage tester unit, comparator, variable resistor controller and processing unit.The resistance value that processing unit transmits according to variable resistor controller and the voltage drop value that voltage tester unit transmits calculate the current value flowing through the electric current of variable resistor controller.The present current value that comparator transmits processing unit and reference current value compare, and export compare result signal to variable resistor controller.The resistance value of the resistance sizes between the first end of current variable resistance and the 3rd end is passed to processing unit by variable resistor controller.When the compare result signal of comparator represents that present current value is greater than reference current value, variable resistor controller, by regulating the 3rd end of variable resistance, becomes to make the resistance between the first end of variable resistance and the 3rd end the electric current reducing greatly to flow through LED group.
Description
Technical field
The present invention relates to display and lighting field, more particularly, the present invention relates to a kind of street lamp illuminating device.
Background technology
In the street lamp illumination system in current city, usually can adopt LED to throw light on.LED is a kind of solid-state semiconductor device, and it can be directly luminous energy electric energy conversion.The heart of LED is a semiconductor wafer, and one end of semiconductor wafer is attached on a support (as negative pole), and the other end of semiconductor wafer connects the positive pole of power supply, and whole wafer is got up by epoxy encapsulation.
Semiconductor wafer is made up of two parts, and a part is P type semiconductor, and inside it, occupy an leading position in hole, and the other end of semiconductor wafer is N type semiconductor, at this side mainly electronics.Time these two kinds of semiconductors couple together, between them, just form one " P-N junction ".
When electric current acts on this wafer by wire time, electronics will be pushed to P district, and in P district, electronics is with hole-recombination, then will send energy with the form of photon, the principle of LED luminescence that Here it is.And the wavelength of light determines the color of light, determine by forming P-N junction material.
But the temperature of LED is higher under normal circumstances, and resistance is less.In other words, the band gap of the PN junction in LED has temperature dependency, and the band gap of PN junction in LED raises with temperature and reduces.Therefore, the forward bias voltage of LED has negative temperature dependency, and characteristicness is reduce with the rising of temperature.Therefore, when LED is driven with constant voltage (constant pressure source), the LED temperature caused due to ambient temperature and spontaneous heating raises, and thus reduces the forward bias voltage of LED, and increases the forward current of LED.The forward current increased impels temperature to raise further and forward voltage reduces further.
But the light output brightness of LED is directly proportional to the electric current flowing through LED.That is, the electric current flowing through LED is larger, and the light output brightness of LED is larger; Otherwise the electric current flowing through LED is less, the light output brightness of LED is less.So when drive of constant voltage source LED display unit, owing to flowing through the curent change of LED, therefore, the brightness of the light that LED display unit sends can change, and even sometimes acute variation can occur.Now, street lamp can seem flickering, may produce harmful effect to lighting condition, and serious may cause certain influence to circuit, and this does not wish to occur.
Summary of the invention
Technical problem to be solved by this invention is for there is above-mentioned defect in prior art, provides a kind of street lamp illuminating device that can keep brightness stability when utilizing drive of constant voltage source LED or LED strip.
According to the present invention, provide a kind of street lamp illuminating device, comprise power supply and LED display device.LED display device comprises: constant-current source, LED group, variable resistance, voltage tester unit, comparator, variable resistor controller and processing unit; Wherein, variable resistance comprises first end, the second end and the 3rd end, wherein by the resistance sizes between the first end of the variable resistance that regulates the position of the 3rd end of variable resistance to regulate and the 3rd end; And wherein, the first end of LED group is connected to the first end of constant-current source, and the second end of LED group is connected to the first end of variable resistance; The three-terminal link of variable resistance is to the second end of constant-current source; The two ends of voltage tester unit are connected to the first end of variable resistance and the second end respectively or are connected to first end and the 3rd end of variable resistance respectively, thus measure the voltage drop on variable resistance 3; And wherein, the output of voltage tester unit is connected to processing unit, thus transmit the voltage drop value on variable resistance to processing unit; The output of processing unit is connected to the first input end of comparator 5, and the second input of comparator is defeated have input reference current value; Wherein, reference current value represents the current value size expecting to flow through LED group; And the voltage drop value that wherein, the resistance value that transmits according to variable resistor controller of processing unit and voltage tester unit transmit calculates the current present current value flowing through the electric current of variable resistor controller; The output of comparator is connected to variable resistor controller, and the present current value that comparator transmits processing unit and reference current value compare, and export compare result signal to variable resistor controller; And wherein, variable resistor controller regulates the 3rd end of variable resistance according to the compare result signal of comparator, thus the resistance sizes between the first end of the variable resistance regulated and the 3rd end; Further, the resistance value of the resistance sizes between the first end of current variable resistance and the 3rd end is passed to processing unit by variable resistor controller; Wherein, when the compare result signal of comparator represents that present current value is greater than reference current value, variable resistor controller, by regulating the 3rd end of variable resistance, becomes to make the resistance between the first end of variable resistance and the 3rd end the electric current reducing greatly to flow through LED group.
In use, carry out supply of electric power by power supply to LED display device, then street lamp illuminating device of the present invention can keep brightness stability.It will be appreciated by persons skilled in the art that some annexes in street lamp illuminating device, such as lampshade, lamp stand etc., those skilled in the art can be selected by routine techniques means.
Preferably, when the compare result signal of comparator represents that present current value is less than reference current value, variable resistor controller, by regulating the 3rd end of variable resistance, increases to make the resistance decreasing between the first end of variable resistance and the 3rd end the electric current flowing through LED group.
Preferably, described LED display device also comprises: reference current value setting unit; The size of reference current value is regulated by reference to current value setting unit.
Preferably, the first input end of comparator is positive input, and the second input of comparator is defeated is reverse input end.
Preferably, LED group is single led.
Or preferably, LED group is multiple LED of series connection.
According to the present invention, by the real-time control of circuit, even if when using constant-current source, the intrinsic brilliance as the LED group of display unit also can be made to be adjusted to the expectation brightness represented by reference current value; Therefore, even if street lamp illuminating device according to a first embodiment of the present invention also can keep the luminance level expected when using constant-current source.
Accompanying drawing explanation
By reference to the accompanying drawings, and by reference to detailed description below, will more easily there is more complete understanding to the present invention and more easily understand its adjoint advantage and feature, wherein:
Fig. 1 schematically shows the block diagram of LED display device according to a first embodiment of the present invention.
Fig. 2 schematically shows the block diagram of LED display device according to a second embodiment of the present invention.
It should be noted that, accompanying drawing is for illustration of the present invention, and unrestricted the present invention.Note, represent that the accompanying drawing of structure may not be draw in proportion.Further, in accompanying drawing, identical or similar element indicates identical or similar label.
Embodiment
In order to make content of the present invention clearly with understandable, below in conjunction with specific embodiments and the drawings, content of the present invention is described in detail.
< first embodiment >
Fig. 1 schematically shows the block diagram of LED display device according to a first embodiment of the present invention.
As shown in Figure 1, LED display device according to a first embodiment of the present invention comprises: constant-current source 1, LED group 2, variable resistance 3, voltage tester unit 4, comparator 5, variable resistor controller 6 and processing unit 7.
Wherein, such as, LED group 2 is multiple LED of series connection.Certainly, LED group 2 also can be the LED combination of other form, or can be even as a LED.
Wherein, variable resistance 3 comprises first end D1, the second end D2 and the 3rd end D3, wherein by the resistance sizes between the first end D1 of the variable resistance 3 that regulates the position of the 3rd end D3 of variable resistance 3 to regulate and the 3rd end D3.
And wherein, the first end of LED group 2 is connected to the first end of constant-current source 1, the second end of LED group 2 is connected to the first end D1 of variable resistance 3.
3rd end D3 of variable resistance 3 is connected to the second end of constant-current source 1.
The two ends of voltage tester unit 4 are connected to first end D1 and the second end D2 of variable resistance 3 respectively, thus measure the voltage drop on variable resistance 3.
Alternatively, such as, the first measuring junction of voltage tester unit 4 and the second measuring junction are connected to first end D1 and the 3rd end D3 of variable resistance 3 respectively, thus measure the voltage drop on variable resistance 3.
The output of voltage tester unit 4 is connected to processing unit 7, thus transmits the voltage drop value on variable resistance 3 to processing unit 7.
The output of processing unit 7 is connected to the first input end (such as positive input) of comparator 5, and the second input defeated (such as reverse input end) of comparator 5 have input reference current value Io.Wherein, reference current value Io illustrates the current value size expecting to flow through LED group 2, that is, reference current value Io illustrates the expectation brightness of LED group 2.
The resistance value that processing unit 7 transmits according to variable resistor controller 6 and the voltage drop value that voltage tester unit 4 transmits calculate the current present current value flowing through the electric current of variable resistor controller 6.
The output of comparator 5 is connected to variable resistor controller 6.The present current value that comparator 5 pairs of processing units 7 transmit and reference current value Io compare, and export compare result signal to variable resistor controller 6.
Variable resistor controller 6 regulates the 3rd end D3 of variable resistance 3 according to the compare result signal of comparator 5, thus the resistance sizes between the first end D1 of the variable resistance 3 regulated and the 3rd end D3.Further, the resistance value of the resistance sizes between the first end D1 of current variable resistance 3 and the 3rd end D3 is passed to processing unit 7 by variable resistor controller 6.
Specifically, when the compare result signal of comparator 5 represents that present current value is greater than reference current value Io, this just represents that the intrinsic brilliance of LED group 2 is greater than the expectation brightness of LED group 2, thus, variable resistor controller 6 is by regulating the 3rd end D3 of variable resistance 3, thus the resistance between the first end D1 of variable resistance 3 and the 3rd end D3 becomes the electric current reducing greatly to flow through LED group 2, reduce the intrinsic brilliance of LED group 2 thus, thus make the intrinsic brilliance of LED group 2 become the expectation brightness of LED group 2.
Otherwise, when the compare result signal of comparator 5 represents that present current value is less than reference current value Io, this just represents that the intrinsic brilliance of LED group 2 is less than the expectation brightness of LED group 2, thus, variable resistor controller 6 is by regulating the 3rd end D3 of variable resistance 3, thus the resistance decreasing between the first end D1 of variable resistance 3 and the 3rd end D3 increases the electric current flowing through LED group 2, increase the intrinsic brilliance of LED group 2 thus, thus make the intrinsic brilliance of LED group 2 become the expectation brightness of LED group 2.
Can find out, by the real-time control of foregoing circuit, even if when using constant-current source, the intrinsic brilliance as the LED group 2 of display unit also can be made to be adjusted to the expectation brightness represented by reference current value; Therefore, even if LED display device according to a first embodiment of the present invention also can keep the luminance level expected when using constant-current source.
In the case, comprise the street lamp illuminating device of the LED display device of power supply and first embodiment of the invention in use, power supply provides supply of electric power, even if use the street lamp illuminating device of the LED display device of first embodiment of the invention also can keep the luminance level expected when using constant-current source.
< second embodiment >
Fig. 2 schematically shows the block diagram of LED display device according to a second embodiment of the present invention.
As shown in Figure 2, LED display device according to a first embodiment of the present invention shown in LED display device according to a second embodiment of the present invention and Fig. 1 unlike, except the part of the LED display device according to a first embodiment of the present invention shown in Fig. 1, LED display device according to a second embodiment of the present invention also comprises: reference current value setting unit 8.
Specifically, such as, user regulates the size of reference current value Io by reference current value setting unit 8, thus regulates the expectation brightness of LED group 2.
Be understandable that, although the present invention with preferred embodiment disclose as above, but above-described embodiment and be not used to limit the present invention.For any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the technology contents of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (6)
1. a street lamp illuminating device, is characterized in that, comprising:
Power supply; With
LED display device,
Described LED display device comprises: constant-current source, LED group, variable resistance, voltage tester unit, comparator, variable resistor controller and processing unit;
Wherein, variable resistance comprises first end, the second end and the 3rd end, wherein by the resistance sizes between the first end of the variable resistance that regulates the position of the 3rd end of variable resistance to regulate and the 3rd end;
And wherein, the first end of LED group is connected to the first end of constant-current source, and the second end of LED group is connected to the first end of variable resistance; The three-terminal link of variable resistance is to the second end of constant-current source; The two ends of voltage tester unit are connected to the first end of variable resistance and the second end respectively or are connected to first end and the 3rd end of variable resistance respectively, thus measure the voltage drop on variable resistance;
And wherein, the output of voltage tester unit is connected to processing unit, thus transmit the voltage drop value on variable resistance to processing unit; The output of processing unit is connected to the first input end of comparator, and the second input of comparator is defeated have input reference current value; Wherein, reference current value represents the current value size expecting to flow through LED group;
And the voltage drop value that wherein, the resistance value that transmits according to variable resistor controller of processing unit and voltage tester unit transmit calculates the current present current value flowing through the electric current of variable resistor controller; The output of comparator is connected to variable resistor controller, and the present current value that comparator transmits processing unit and reference current value compare, and export compare result signal to variable resistor controller;
And wherein, variable resistor controller regulates the 3rd end of variable resistance according to the compare result signal of comparator, thus the resistance sizes between the first end of the variable resistance regulated and the 3rd end; Further, the resistance value of the resistance sizes between the first end of current variable resistance and the 3rd end is passed to processing unit by variable resistor controller;
Wherein, when the compare result signal of comparator represents that present current value is greater than reference current value, variable resistor controller, by regulating the 3rd end of variable resistance, becomes to make the resistance between the first end of variable resistance and the 3rd end the electric current reducing greatly to flow through LED group.
2. street lamp illuminating device according to claim 1, it is characterized in that, when the compare result signal of comparator represents that present current value is less than reference current value, variable resistor controller, by regulating the 3rd end of variable resistance, increases to make the resistance decreasing between the first end of variable resistance and the 3rd end the electric current flowing through LED group.
3. street lamp illuminating device according to claim 1 and 2, is characterized in that, described LED display device also comprises: reference current value setting unit; The size of reference current value is regulated by reference to current value setting unit.
4. street lamp illuminating device according to claim 1 and 2, is characterized in that, the first input end of comparator is positive input, and the second input of comparator is defeated is reverse input end.
5. street lamp illuminating device according to claim 1 and 2, is characterized in that, LED group is single led.
6. street lamp illuminating device according to claim 1 and 2, is characterized in that, LED group is multiple LED of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210506860.3A CN103025007B (en) | 2012-11-29 | 2012-11-29 | Street lamp illuminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210506860.3A CN103025007B (en) | 2012-11-29 | 2012-11-29 | Street lamp illuminating device |
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| Publication Number | Publication Date |
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| CN103025007A CN103025007A (en) | 2013-04-03 |
| CN103025007B true CN103025007B (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210506860.3A Expired - Fee Related CN103025007B (en) | 2012-11-29 | 2012-11-29 | Street lamp illuminating device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439672A (en) * | 2013-08-27 | 2013-12-11 | 上海德科电子仪表有限公司 | Circuit and method for detecting faults of alarm lamp of motormeter |
| CN104853483B (en) * | 2015-04-16 | 2018-08-21 | 北京迈特力德信息技术有限公司 | A kind of light level setting method and device |
| CN114038431B (en) * | 2021-11-02 | 2023-02-28 | 昆山龙腾光电股份有限公司 | Backlight driving circuit and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640030A (en) * | 2008-07-29 | 2010-02-03 | 三星电子株式会社 | Display device having reduced waterfall noise |
| CN202168257U (en) * | 2011-08-04 | 2012-03-14 | 深圳市瑞信集成电路有限公司 | Charge pump type LED drive circuit with adaptive mode conversion function |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110066664A (en) * | 2009-12-11 | 2011-06-17 | 삼성엘이디 주식회사 | Led driving apparatus |
| CN102345808A (en) * | 2010-08-04 | 2012-02-08 | 富士迈半导体精密工业（上海）有限公司 | Light emitting diode (LED) illumination device |
| CN202494943U (en) * | 2012-02-23 | 2012-10-17 | 樱花卫厨（中国）股份有限公司 | Adjustable constant-voltage constant-current-source circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640030A (en) * | 2008-07-29 | 2010-02-03 | 三星电子株式会社 | Display device having reduced waterfall noise |
| CN202168257U (en) * | 2011-08-04 | 2012-03-14 | 深圳市瑞信集成电路有限公司 | Charge pump type LED drive circuit with adaptive mode conversion function |
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| CN103025007A (en) | 2013-04-03 |
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Effective date of registration: 20160218 Address after: 315400 Zhejiang city of Ningbo province low Tong Street West of Yuyao City Village Applicant after: YUYAO JIJIA ELECTRICAL APPLIANCES Co.,Ltd. Address before: 315400, Zhejiang City, Ningbo province Yuyao Si Zhen Industrial Park Applicant before: Yang Xiafang |
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Effective date of registration: 20190816 Address after: 528415 Building B, No. 24 Guangle Central Road, Xiaolan Town, Zhongshan City, Guangdong Province Patentee after: Zhongshan Mingtuo Lighting Technology Co.,Ltd. Address before: 510000 Guangzhou High-tech Industrial Development Zone Science Avenue 231, 233 Skirt Building B1B2, 1st, 2nd, 3rd and 4th floors Patentee before: BOAO ZONGHENG NETWORK TECHNOLOGY Co.,Ltd. Effective date of registration: 20190816 Address after: 510000 Guangzhou High-tech Industrial Development Zone Science Avenue 231, 233 Skirt Building B1B2, 1st, 2nd, 3rd and 4th floors Patentee after: BOAO ZONGHENG NETWORK TECHNOLOGY Co.,Ltd. Address before: 315400 Zhejiang city of Ningbo province low Tong Street West of Yuyao City Village Patentee before: YUYAO JIJIA ELECTRICAL APPLIANCES Co.,Ltd. |
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Granted publication date: 20160309 Termination date: 20191129 |