CN103108462A - Dimming method of light emitting diode (LED) street lamp - Google Patents
Dimming method of light emitting diode (LED) street lamp Download PDFInfo
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- CN103108462A CN103108462A CN2013100286485A CN201310028648A CN103108462A CN 103108462 A CN103108462 A CN 103108462A CN 2013100286485 A CN2013100286485 A CN 2013100286485A CN 201310028648 A CN201310028648 A CN 201310028648A CN 103108462 A CN103108462 A CN 103108462A
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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
Abstract
The invention discloses a dimming method of a light emitting diode (LED) street lamp. According to the method, a light control room sends a dimming signal to an alternating current / direct current (AC / DC) power supply, the AC / DC power supply outputs a dimming pulse according to the dimming signal, the dimming pulse is transmitted to an LED constant current power module through a direct current bus, and the LED constant current power module outputs different currents to the LED lamp with the dimming pulse as the dimming signal. According to the method, an independent control circuit is not needed, the structure of the system is simple, cost of the system is reduced, wireless interference and electromagnetic interference are avoided, electromagnetic environment is purified, and reliability of the system is improved. The dimming method of the LED street lamp is capable of achieving dimming of 100 levels and is equivalent to a level-less dimming method. The dimming pulse is utilized to transmit the dimming signal, the transmission is not affected by transmission voltage of the direct current bus, and multi-level dimming can be achieved under the circumstance that the voltage of the direct current bus is small.
Description
[technical field]
The present invention relates to the LED street lamp, relate in particular to a kind of LED street light modulating method.
[background technology]
The LED street lamp need to be adjusted the brightness of street lamp according to environmental aspect, and traditional LED road lamp system comprises light control room, AC/DC power supply and a plurality of LED street lamp assembly.LED street lamp assembly comprises LED constant current-supplying module and LED lamp, and LED constant current-supplying module is powered to the LED lamp.LED constant current-supplying module comprises the constant current-supplying circuit and controls MCU, the AC/DC power supply comprises controls MCU and AC/DC change-over circuit, the ac input end of AC/DC change-over circuit connects civil power, and dc output end connects the input of constant current-supplying circuit, the output termination LED lamp of constant current-supplying circuit.
The light-dimming method of tradition LED street lamp is that the PC of light control room sends dimming control signal to the control MCU of AC/DC power supply, the control MCU of AC/DC power supply sends control signal to the control MCU of LED constant current-supplying module again, and the output current that the control MCU by LED constant current-supplying module controls the constant current-supplying circuit is realized the light modulation of LED street lamp.
The LED street lamp is along road arrangement, and the space is far, and street lamp is just farther from the AC/DC power supply.The control MCU of the control MCU of AC/DC power supply and LED constant current-supplying module communicates by letter, usually adopt the technical scheme of wire communication, radio communication or power line carrier communication, all system configuration is complicated, cost is high, the problem of poor reliability existing in various degree for these communication plans.
In order to solve the problems of the technologies described above, the applicant has submitted a kind of application for a patent for invention of LED street light modulating method to State Intellectual Property Office, and (application number is: the technical scheme that 2012104506969 November 13 2012 applying date) adopts as shown in Figure 1, light control room sends dim signal to the AC/DC power supply, the AC/DC power supply is according to the direct current of the different voltages of dim signal output, by dc bus to LED constant current-supplying module, LED constant current-supplying module is exported different electric current as dim signal to the LED lamp with the voltage of input, realizes the light modulation of LED street lamp.The technical scheme of this application relies on power bus-bar to transmit dim signal, only need simple comparison circuit can realize that brightness control signal detects, do not need independently control circuit, system configuration is simple, reduced system cost, there is no air interference and electromagnetic interference, the purifying electric magnetic environment has improved system reliability.
This light modulation scheme utilizes the magnitude of voltage of power line and the drive current formation one-to-one relationship of LED street lamp to realize light modulation.Because the circuit of street lamp power line is long, the pressure drop meeting reaches 20% of power voltage line value, so the simple and easy carrier schemes of this power line can only be applied in the power line supply line of the above voltage of 250V, and can only realize the light modulation of easy 2-3 level, be difficult to realize more multistage light modulation.
[summary of the invention]
The technical problem to be solved in the present invention is to provide a kind of in the situation that DC bus-bar voltage is lower, also can realize the LED street light modulating method of multistage light modulation.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of LED street light modulating method, light control room sends dim signal to the AC/DC power supply, the AC/DC power supply is sent to LED constant current-supplying module according to dim signal output light modulation pulse by dc bus, LED constant current-supplying module is exported different electric current as dim signal to the LED lamp with the light modulation pulse, realizes the light modulation of LED street lamp.
Above-described LED street light modulating method, light control room sends dim signal to the MCU of AC/DC power supply, and the MCU of AC/DC power supply exports the light modulation pulse of different pulse durations to LED constant current-supplying module according to the AC/DC change-over circuit that the dim signal of different brightness is controlled the AC/DC power supply; The pulse duration that the pulse width detection circuit basis of LED constant current-supplying module detects is sent different control signals to the control MCU of LED constant current-supplying module, control MCU and export different electric currents according to the constant current-supplying circuit of control signal control LED constant current-supplying module to the LED lamp, realize the light modulation of LED street lamp.
Above-described LED street light modulating method, described light modulation pulse comprise a light modulation timing initial pulse and a light modulation timing stopping pulse, and described pulse duration is the time span between light modulation timing initial pulse and light modulation timing stopping pulse.
Above-described LED street light modulating method, light modulation timing initial pulse is to be lowered to fast after the pulse valley threshold voltage Quick-return under the dc bus output voltage to a pulse of initial value, and light modulation timing initial pulse is to be lowered to fast after the pulse valley threshold voltage Quick-return under the dc bus output voltage to a pulse of initial value.
Above-described LED street light modulating method, valley point voltage is the 85-95% of dc bus output voltage.
Above-described LED street light modulating method is controlled MCU by the output current of change PWM Duty ratio control constant current-supplying circuit, in the situation that the duty ratio of the constant change of output current peak value electric current rectangular pulse, the light modulation of realization; The duty ratio of output current rectangular pulse is directly proportional to the pulse duration of light modulation pulse.
Above-described LED street light modulating method compares with default time span the duty ratio that obtains the output current rectangular pulse by pulse duration.
The present invention relies on power bus-bar to transmit dim signal, only need simple pulse width detection circuit can realize that brightness control signal detects, do not need independently control circuit, system configuration is simple, reduced system cost, there is no air interference and electromagnetic interference, the purifying electric magnetic environment has improved system reliability.
The present invention can realize the nearly light modulation of 100 grades, is equivalent to the stepless dimming mode.The present invention utilizes the light modulation pulse to transmit dim signal, is not subjected to the impact of dc bus transmission voltage, realizes multistage light modulation in can DC bus-bar voltage lower situation.
[description of drawings]
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the theory diagram of one of prior art LED road lamp system.
Fig. 2 is the theory diagram of LED street light modulating embodiment of the method road lamp system of the present invention.
Fig. 3 is the theory diagram of LED street light modulating embodiment of the method LED street lamp assembly of the present invention.
[embodiment]
As shown in Figure 2, light control room sends dim signal to the MCU of AC/DC power supply, and the MCU of AC/DC power supply exports the light modulation pulse of different pulse durations to LED constant current-supplying module according to the AC/DC change-over circuit that the dim signal of different brightness is controlled the AC/DC power supply by dc bus; The pulse duration that the pulse width detection circuit basis of LED constant current-supplying module detects is sent different control signals to the control MCU of LED constant current-supplying module, control MCU and export different electric currents according to the constant current-supplying circuit of control signal control LED constant current-supplying module to the LED lamp, realize the light modulation of LED street lamp.
The light modulation pulse comprises light modulation timing initial pulse and light modulation timing stopping pulse, and the pulse duration of light modulation pulse is the time span between light modulation timing initial pulse and light modulation timing stopping pulse.
Light modulation timing initial pulse is to be lowered to fast after the pulse valley threshold voltage Quick-return under the dc bus output voltage to a pulse of initial value, and light modulation timing initial pulse is to be lowered to fast after the pulse valley threshold voltage Quick-return under the dc bus output voltage to a pulse of initial value.
Light modulation pulse valley threshold voltage can be the 85-95% of dc bus output voltage.
The control MCU of LED constant current-supplying module is by the output current of change PWM Duty ratio control constant current-supplying circuit, in the situation that the duty ratio of the constant change of output current peak value electric current rectangular pulse, the light modulation of realization; The duty ratio of output current rectangular pulse is directly proportional to the pulse duration of light modulation pulse.
The control MCU of LED constant current-supplying module compares with default time span the duty ratio that obtains the output current rectangular pulse by pulse duration.
Describe by the following examples:
During normal operation, civil power 380V alternating current is input to the AC/DC change-over circuit of AC/DC power supply, and AC/DC change-over circuit output 280V, the isolated DC electricity of 10KW be to dc bus, for being distributed in 88, the zone LED street lamp power supply, road lamp power supply of 3 square kilometres.LED constant current-supplying module in the street lamp assembly becomes 300 milliamperes of electric currents of peak value to the 200V-280V direct voltage to the LED lamp statements based on collusion electricity of street lamp.
When needing light modulation 50%, light modulation 50% signal is sent to the AC/DC system power supply by grid line RJ45 interface in street lamp institute control room, and the MCU of system power supply is according to program setting, and the pulse duration that is converted into the light modulation pulse is corresponding 100% brightness of 1s(pulsewidth 2s).The AC/DC change-over circuit of AC/DC power supply is that the light modulation pulse of 1s is to LED constant current-supplying module by the dc bus output pulse width.At first the AC/DC change-over circuit is lowered fast output voltage 20V and is returned to initial value 280V again, forms light modulation timing initial pulse, after the 1s clock, then lowers fast output voltage 20V and is returned to initial value 280V again, forms light modulation timing stopping pulse.The time that the pulse width detection circuit of LED constant current-supplying module detects between bus light modulation timing initial pulse and light modulation timing stopping pulse is 1s, and testing result is sent to the MCU of LED constant current-supplying module.The MCU of LED constant current-supplying module calculates the duty ratio of constant current power supply circuits output current rectangular pulse: the full brightness pulsewidth 2s=50% of duty ratio=light modulation pulsewidth 1s/.The MCU of LED constant current-supplying module is transferred to 50% with the PWM duty ratio of constant current-supplying circuit, and constant current-supplying circuit output current is the rectangular pulse of the duty ratio 50% of 300 milliamperes of peak values.At this moment, the lamp pearl only had for 50% time luminous, and 90 watts * 80 lumens/watt of lumen meter * 50%=3600 lumen is pressed in luminous brightness.
When needing light modulation 75%, light modulation 75% signal is sent to the AC/DC system power supply by grid line RJ45 interface in street lamp institute control room, and the MCU of system power supply is according to program setting, and the pulse duration that is converted into the light modulation pulse is corresponding 100% brightness of 1.5s(pulsewidth 2s).The AC/DC change-over circuit of AC/DC power supply is that the light modulation pulse of 1.5s is to LED constant current-supplying module by the dc bus output pulse width.At first the AC/DC change-over circuit is lowered fast output voltage 20V and is returned to initial value 280V again, forms light modulation timing initial pulse, after the 1.5s clock, then lowers fast output voltage 20V and is returned to initial value 280V again, forms light modulation timing stopping pulse.The time that the pulse width detection circuit of LED constant current-supplying module detects between bus light modulation timing initial pulse and light modulation timing stopping pulse is 1.5s, and testing result is sent to the MCU of LED constant current-supplying module.The MCU of LED constant current-supplying module calculates the duty ratio of constant current power supply circuits output current rectangular pulse: the full brightness pulsewidth 2s=75% of duty ratio=light modulation pulsewidth 1.5s/.The MCU of LED constant current-supplying module is transferred to 75% with the PWM duty ratio of constant current-supplying circuit, and constant current-supplying circuit output current is the rectangular pulse of the duty ratio 75% of 300 milliamperes of peak values.At this moment, the lamp pearl only had for 75% time luminous, and 90 watts * 80 lumens/watt of lumen meter * 75%=5400 lumen is pressed in luminous brightness.
If needing the brightness of street lamp is 100%, light modulation 100% signal is sent to the AC/DC system power supply by grid line RJ45 interface in street lamp institute control room, the MCU of system power supply is according to program setting, and the pulse duration that is converted into the light modulation pulse is corresponding 100% brightness of 2s(pulsewidth 2s).The AC/DC change-over circuit of AC/DC power supply is that the light modulation pulse of 2s is to LED constant current-supplying module by the dc bus output pulse width.At first the AC/DC change-over circuit is lowered fast output voltage 20V and is returned to initial value 280V again, forms light modulation timing initial pulse, after the 2s clock, then lowers fast output voltage 20V and is returned to initial value 280V again, forms light modulation timing stopping pulse.The time that the pulse width detection circuit of LED constant current-supplying module detects between bus light modulation timing initial pulse and light modulation timing stopping pulse is 2s, and testing result is sent to the MCU of LED constant current-supplying module.The MCU of LED constant current-supplying module calculates the duty ratio of constant current power supply circuits output current rectangular pulse: the full brightness pulsewidth 2s=100% of duty ratio=light modulation pulsewidth 2s/.The MCU of LED constant current-supplying module is transferred to 100% with the PWM duty ratio of constant current-supplying circuit, and constant current-supplying circuit output current is the rectangular pulse of the duty ratio 100% of 300 milliamperes of peak values.At this moment, 90 watts * 80 lumens/watt of lumen meter * 100%=7200 lumen is pressed in luminous brightness luminous 100% time of lamp pearl.
LED street light modulating method operation process chart of the present invention
As can be seen from the above embodiments, the duty ratio of constant current-supplying circuit output current, the brightness that is street lamp is corresponding with the pulse duration of light modulation pulse, just can obtain the duty ratio of corresponding constant current-supplying circuit output current and the brightness of street lamp as long as adjust the pulse duration of light modulation pulse.The present invention can realize the nearly light modulation of 100 grades, is equivalent to the stepless dimming mode.The present invention utilizes the light modulation pulse to transmit dim signal, is not subjected to the impact of dc bus transmission voltage, realizes multistage light modulation in can DC bus-bar voltage lower situation.
The present invention relies on power bus-bar to transmit dim signal equally, only need simple pulse width detection circuit can realize that brightness control signal detects, do not need independently control circuit, system configuration is simple, reduced system cost, there is no air interference and electromagnetic interference, the purifying electric magnetic environment has improved system reliability.
Claims (7)
1. LED street light modulating method, it is characterized in that, light control room sends dim signal to the AC/DC power supply, the AC/DC power supply is sent to LED constant current-supplying module according to dim signal output light modulation pulse by dc bus, LED constant current-supplying module is exported different electric current as dim signal to the LED lamp with the light modulation pulse, realizes the light modulation of LED street lamp.
2. LED street light modulating method according to claim 1, it is characterized in that, light control room sends dim signal to the MCU of AC/DC power supply, and the MCU of AC/DC power supply exports the light modulation pulse of different pulse durations to LED constant current-supplying module according to the AC/DC change-over circuit that the dim signal of different brightness is controlled the AC/DC power supply; The pulse duration that the pulse width detection circuit basis of LED constant current-supplying module detects is sent different control signals to the control MCU of LED constant current-supplying module, control MCU and export different electric currents according to the constant current-supplying circuit of control signal control LED constant current-supplying module to the LED lamp, realize the light modulation of LED street lamp.
3. LED street light modulating method according to claim 1, it is characterized in that, described light modulation pulse comprises a light modulation timing initial pulse and a light modulation timing stopping pulse, and described pulse duration is the time span between light modulation timing initial pulse and light modulation timing stopping pulse.
4. LED street light modulating method according to claim 3, it is characterized in that, light modulation timing initial pulse is to be lowered to fast after the pulse valley threshold voltage Quick-return under the dc bus output voltage to a pulse of initial value, and light modulation timing initial pulse is to be lowered to fast after the pulse valley threshold voltage Quick-return under the dc bus output voltage to a pulse of initial value.
5. LED street light modulating method according to claim 4, is characterized in that, valley point voltage is the 85-95% of dc bus output voltage.
6. LED street light modulating method according to claim 2, it is characterized in that, control MCU by the output current of change PWM Duty ratio control constant current-supplying circuit, in the situation that the duty ratio of the constant change of output current peak value electric current rectangular pulse, the light modulation of realization; The duty ratio of output current rectangular pulse is directly proportional to the pulse duration of light modulation pulse.
7. LED street light modulating method according to claim 6, is characterized in that, compares with default time span the duty ratio that obtains the output current rectangular pulse by pulse duration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100286485A CN103108462A (en) | 2013-01-25 | 2013-01-25 | Dimming method of light emitting diode (LED) street lamp |
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| CN2013100286485A CN103108462A (en) | 2013-01-25 | 2013-01-25 | Dimming method of light emitting diode (LED) street lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391672A (en) * | 2013-08-12 | 2013-11-13 | 铜陵学院 | Single lamp control device for remote measurement and control |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102548101A (en) * | 2010-12-27 | 2012-07-04 | 英飞特电子（杭州）有限公司 | LED dimming system |
| CN102625538A (en) * | 2012-03-27 | 2012-08-01 | 佛山市南海科谷电源有限公司 | Constant current LED (light-emitting diode) signal conditioning circuit |
| CN202587532U (en) * | 2012-05-14 | 2012-12-05 | 罗敏 | Single-wire carrier dimming circuit structure |
| CN102830279A (en) * | 2012-09-14 | 2012-12-19 | 北京华鑫志和科技有限公司 | Data processing device used for electric energy meter and power consumption collector |
| CN202663588U (en) * | 2012-03-02 | 2013-01-09 | 广州市雷格斯光电科技有限公司 | Dimming and drive control circuit for LED lighting |
-
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- 2013-01-25 CN CN2013100286485A patent/CN103108462A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102548101A (en) * | 2010-12-27 | 2012-07-04 | 英飞特电子（杭州）有限公司 | LED dimming system |
| CN202663588U (en) * | 2012-03-02 | 2013-01-09 | 广州市雷格斯光电科技有限公司 | Dimming and drive control circuit for LED lighting |
| CN102625538A (en) * | 2012-03-27 | 2012-08-01 | 佛山市南海科谷电源有限公司 | Constant current LED (light-emitting diode) signal conditioning circuit |
| CN202587532U (en) * | 2012-05-14 | 2012-12-05 | 罗敏 | Single-wire carrier dimming circuit structure |
| CN102830279A (en) * | 2012-09-14 | 2012-12-19 | 北京华鑫志和科技有限公司 | Data processing device used for electric energy meter and power consumption collector |
Non-Patent Citations (1)
| Title |
|---|
| 张雪霁: "LED集中直流供电系统的通信及调光控制研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391672A (en) * | 2013-08-12 | 2013-11-13 | 铜陵学院 | Single lamp control device for remote measurement and control |
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Application publication date: 20130515 |