CN201178507Y - Constant-current automatic light regulating electric source for LED traffic light - Google Patents

Constant-current automatic light regulating electric source for LED traffic light Download PDF

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Publication number
CN201178507Y
CN201178507Y CNU2008200629085U CN200820062908U CN201178507Y CN 201178507 Y CN201178507 Y CN 201178507Y CN U2008200629085 U CNU2008200629085 U CN U2008200629085U CN 200820062908 U CN200820062908 U CN 200820062908U CN 201178507 Y CN201178507 Y CN 201178507Y
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circuit
power supply
resistance
current
led
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CNU2008200629085U
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陈坤华
曹型勇
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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
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

An automatic constant-current light adjusting power supply for LED traffic lamps comprises an AC protection filter circuit, a rectification and filter circuit, a gating protection circuit, a high-frequency IC with a switch circuit and a light collecting, light adjusting and shunt circuit, which are sequentially connected with each other in series between an AC power supply and a load. A photosensitive resistor and an optical coupling chip in the light collecting and light adjusting circuit are used for detecting the environment brightness of the traffic lamps under the control of the high-frequency IC having a PI switch power integrated chip, and the shunt circuit is used for adjusting the magnitude of a load current to automatically reduce the brightness at night to about 3/4 that in the daytime, thereby meeting the different requirements for lamp brightness for safe driving for the pedestrians in the daytime and at night. From the evening to the night then to the dawn of the second day, singe LED of the signal lamp automatically works with a current of 5 to 18 mA, thereby saving electric energy by 30 to 45%. The low-current operation of the LED at night can slow down brightness and prolong the service life of the LED. The LED can be prevented from current impact, short circuit, open loop, under-voltage, over-voltage, latching off, etc. by using the protection circuit, the high-frequency IC, etc. The DC power supply can be used for substituting for the Siemens controller power supply to obviate the need of an isolating transformer, thereby lowering the cost.

Description

Led traffic light constant current power supply with an automatic light meter
(1) technical field:
The utility model relates to a kind of DC power supply that is used for the LED traffic lights, belongs to electric heating, electric lighting class (H05B) and power supply control or regulates class (H02M).
(2) background technology:
In the traffic lights that the light-emitting diode (LED) of existing domestic production is made, it is all different that the producer of each production of voltage of driving LED adopts, its light-emitting diode luminance, and aging speed all there are differences.At the LED of same light intensity traffic lights, can obviously see show, Huang, green color in the sun, but the high light at the more weak local this traffic lights LED of brightness at night is just dazzling especially, if it is too bright at in-plant main direction of observation light, make driver or pedestrian often dazzle the eyes phenomenon, become traffic hidden danger.For this has proposed the design requirement of light modulation and corresponding power saving function to the LED traffic lights.Because the PN junction stabilized voltage characteristic of LED, the internal resistance meeting changes under the different situation of temperature, therefore can not adopt the dimming mode of traditional change component temperature.
Simultaneously, the present lamp of China traffic department, the power supply heating is big, and what also have uses transformer, when electric current was big, heating was severe more, breaks down the bad arrangement of light-emitting diode thus easily especially, it is luminous to have gone bad the LED that can influence other, must add voltage stabilizing didoe, but increases cost.Therefore the demand of the constant current power supply with an automatic light meter that the design work state does not generate heat and cost is low has been proposed.
(3) summary of the invention:
The led traffic light constant current power supply with an automatic light meter that the utility model proposes mainly is to utilize the stabilized voltage characteristic of light-emitting diode to research and develop.One of its purpose be satisfy pedestrian such as driver by day be the different demands of safety traffic night to the light power; Two of purpose is economize on electricitys and prevents power supply heating accident etc.Its technical scheme is as follows:
Led traffic light constant current power supply with an automatic light meter comprises the AC power 1 of input and the LED load circuit 7 of output, it is characterized in that
7 current rectifying and wave filtering circuits 3 in sequential series of the AC power 1 of input and the LED load circuit of output, the high-frequency integrated circuit 5 that contains switching circuit and daylighting light modulation shunt circuit 6.
Above-mentioned AC power 1 can be connected with 3 of current rectifying and wave filtering circuits and be exchanged protection filter circuit 2, comprises fuse F in it 2, piezo-resistance YR, temperature-sensitive element NTC, filter capacitor C 2And resistance R 2Be provided with the filter circuit 3.2 that bridge rectifier 3.1 and filter capacitor in parallel form in the above-mentioned current rectifying and wave filtering circuit 3.
Can set up gate protective circuit 4 at above-mentioned current rectifying and wave filtering circuit 3 and 5 of high-frequency integrated circuits, comprise field effect gated devices Q in it 4, voltage stabilizing didoe D 4, D 41, diode D 42, capacitor C 4And resistance R 41, R 42Delay capacitor C 41, inductance L 4And resistance R 43Comprise high frequency integrated switch power chip IC in the above-mentioned high-frequency integrated circuit 5 that contains switching power source chip 5, diode D 51, D 52, capacitor C 5, C 51, C 52, inductance L 51, L 52And resistance R 50, R 51, R 53, R 55Comprise opto-coupler chip IC in the above-mentioned daylighting light modulation shunt circuit 6 6, triode Q 6, photo resistance R 60, adjustable resistance R 61, fixed resistance R62, R63, R 64And capacitor C 61
The utility model beneficial effect:
1) the utility model provides a kind of constant current power supply with an automatic light meter by the constant Control current of load size electric current.If the daylighting circuit that contains photo resistance and optocoupler detects the ambient brightness of traffic lights: during sun light intensity, photo resistance presents low resistance state, shunt circuit work, optocoupler IC 6Luminous change is big, load current on the signal lamp LED and shunt circuit equivalence, and signal lamp presents high brightness; When otherwise sunlight was weak, photo resistance presented high resistance state, and optocoupler is luminous to be reduced, shunt circuit work, and the load current on the LED just reduces, and signal lamp brightness reduces.Traffic lights brightness being changed automatically, realized automatically the light intensity of traffic lights being reduced to about 3/4 of daytime at night, is 200～300cd (candela), satisfy thus pedestrian such as driver by day be the different demands of safety traffic night to the light power.By 5 controls of daylighting electric circuit inspection high-frequency integrated circuit, can realize the constant current of 5mA～120mA by the size of adjusting shunt current, extremely to second day dawn, single LED of signal lamp automatically with 5mA～18mA operating current work, saves electric energy about 30%～45% from the dusk to the night.
2) latch protection such as reset fast by realizations anti-current impacts such as exchanging protection filter circuit 2, gate protective circuit 4 and high-frequency integrated circuit 5, short circuit, open loop, under-voltage, overvoltage being set, latching shutoffs, continuing low-voltage input power supply output disturbance, exchange to import disconnection.
3) dimming function is worked at night in low current condition LED, slows down the brightness decay of luminescent device LED, has prolonged the useful life of LED.
4) two groups of LED traffic lights making of this constant current power supply with an automatic light meter are connected on the Siemens Control device and test, and do not find the controller jumping, do not clash.Prove the alternative existing Siemens Control device power supply of this power supply, one group of lamp can reduce three of the interior isolating transformers of existing power supply thus, approximately reduces 60 yuan of costs.
5) adopt this constant current power supply lamp panel with an automatic light meter, because of operating state is not generated heat, need not add voltage stabilizing didoe during arranging light emitting diode, the lamp cost reduces about 5 yuan thus.
(4) description of drawings:
Fig. 1 the utility model circuit block diagram
Fig. 2 the utility model embodiment 1 circuit diagram
(5) embodiment:
Embodiment 1: sees Fig. 1, sees Fig. 2,
AC power 1 is that civil power is at 165-260V.Exchange protection filter circuit 2 in it by fuse F 2, piezo-resistance YR, temperature-sensitive element NTC, in parallel filter capacitor C 2And resistance R 2, R 21Form and (also can not establish R 21).Its function is: the fluctuation and the impact of control voltage; Short circuit and open loop protection; Input voltage is under-voltage and overvoltage protection, feedback compensation.
Current rectifying and wave filtering circuit 3 is by bridge rectifier 3.1 and dc output end four branch road filter capacitor C in parallel 31, C 32, C 33, C 34The filter circuit 3.2 that forms is formed.Bridge rectifier 3.1 becomes pulsating direct current with electric main, carries out filtering by filter circuit 3.2 again.
Gate protective circuit 4 is provided with field effect gated devices Q in it 4, voltage stabilizing didoe D 4, D 41, diode D 42, capacitor C 4And resistance R 41, R 42Delay capacitor C 41, inductance L 4And resistance R 43Bing Lian voltage stabilizing didoe D wherein 41, be used to provide the voltage of gating circuit and set the lowest AC operating voltage.
Diode in series D 42, when being used for Q4 and closing, avoid load terminal voltage recoil and separately with filtering and gating circuit.Gate protective circuit 4 functions are: overload or latch turn-off protection during the open loop fault; Prevented power supply output disturbance when lasting low-voltage input fluctuation, and resetted exchanging to latch fast when input disconnects.
The high-frequency integrated circuit 5 that contains switching power source chip is traffic lights specialty usefulness, and it combines with daylighting light modulation shunt circuit 6 realizes load constant current output.By the daylighting electric circuit inspection signal is imported into by high-frequency integrated circuit 5 controls, adjust the constant current that the shunt current size realizes 5mA～120mA.The size that adjustable resistance control output current is arranged.It is interior by high frequency integrated switch power chip IC 5, diode D51, D52, capacitor C 5, C51, C52, inductance L 51, L 52, resistance R 50, R51, R52, R53, R54, R55 compositions such as (also can not establish R52, R54).
Chip IC 5Adopt PI company power supply control chip series, i.e. PI Switching Power Supply integrated chip.(model TNY267P, TNY268P etc.), IC 5Operating frequency is at 80KHZ-264KHZ during peak load.Its feature 700VHV-FET rated value, power supply voluntarily, sluggish overheated shutoff, frequency modulation(FM) reduce EMI, the under-voltage detection of input voltage, standby and unloaded low-power consumption, Power Limitation.Adopt the bifrequency sample mode can reduce output ripple; Chip is selected strict I for use 2F (current-limiting points overvoltage, overcurrent, current-limiting protection) parameter has improved the ability of device power output and overload power has been minimized, and power supply need not the bias voltage winding voluntarily in drain electrode, and efficient exceeds 2 to 5 than RCC.The chip ON time prolongs the stress requirement that will reduce device when switching on and shutting down, the chip-scale accurate thermal is turn-offed 142 degree and auto restore facility provides system-level overload protection and need not manual reset.Adaptive I LIMIT(chip IC 5The inner cut-off current of electric current) overload power when reducing the high pressure input, the maximum output when adaptive maximum impulse ON time extended characteristic improves the low-voltage input.
Diode D 51As ON/OFF control, can save compensating element, and can select for use cheaply the Zener voltage-stabiliser tube to do parameter and realize the precise and stable of output voltage; Switch control maintains the permanent efficient operation in the whole loading range.Diode D52 and resistance R 55 provide strict current control parameter tolerance and start automatically.If chip biasing resistor R 51And R 52No-load power consumption can be reduced to below the 50mW.The resistance R that is provided with 53And R 54Under-voltage locking can prevent the bad fluctuation of exporting when the outage of energising/short circuit.Resistance R 50For modulated feedback threshold values can prevent burst of pulses, reduce output voltage ripple.Capacitor C 5 is used to reduce the EMI conductive loop, and conductive loop is made up of C5 and IC5.Capacitor C 51Use single capacitor, select I LIMITRepresentative value), realize design flexibility.C 52Shunt capacitance for anti-voltage fluctuation.Inductance L 51Be the feedback filtering inductance, can avoid the fluctuation of exporting.Inductance L 52Chu can inductance for output.
Daylighting light modulation shunt circuit 6 is interior by opto-coupler chip IC 6, triode Q 6, photo resistance R 60, adjustable resistance R 61, fixed resistance R62, R63, R64, R65 (also can not establish R65) and loop capacitance C 61, shunt capacitance C 62Form.Wherein contain opto-coupler chip IC 6With photo resistance R 60The daylighting circuit ambient brightness of traffic lights is detected; The load size is utilized chip IC 6Light is every coming control IC 5HF switch control voltage reaches the control of circuital current.Triode Q6 and photo resistance R6 form with an automatic light meter.Shunt circuit is by adjustable resistance R 61, fixed resistance R62, R63, formations such as R64, R65.During sun light intensity, photo resistance R 60Present low resistance state, optocoupler IC 6Luminous little, shunt circuit work, the load current on the signal lamp LED is big, and traffic lights present high brightness; When otherwise sunlight was weak, load current reduced, a little less than the signal lamp brightness.

Claims (8)

1. led traffic light constant current power supply with an automatic light meter comprises the AC power (1) of input and the LED load circuit (7) of output, it is characterized in that
Current rectifying and wave filtering circuit in sequential series (3), the high-frequency integrated circuit (5) that contains switching power source chip and daylighting light modulation shunt circuit (6) between the LED load circuit (7) of AC power of input (1) and output.
2. by the described constant current of claim 1 power supply with an automatic light meter, it is characterized in that series connection exchanges between AC power (1) and current rectifying and wave filtering circuit (3) to protect filter circuit (2).
3. by the described constant current of claim 2 power supply with an automatic light meter, it is characterized in that comprising fuse F in the interchange protection filter circuit (2) 2, piezo-resistance YR, temperature-sensitive element NTC, filter capacitor C 2And resistance R 2
4. by the described constant current of claim 1 power supply with an automatic light meter, it is characterized in that being provided with in the current rectifying and wave filtering circuit (3) filter circuit (3.2) of bridge rectifier (3.1) and filter capacitor in parallel formation.
5. by the described constant current of claim 4 power supply with an automatic light meter, it is characterized in that between current rectifying and wave filtering circuit (3) and high-frequency integrated circuit (5), establishing gate protective circuit (4), comprise field effect gated devices Q in it 4, voltage stabilizing didoe D 4, D 41, diode D 42, capacitor C 4And resistance R 41, R 42Delay capacitor C 41, inductance L 4And resistance R 43
6. by the described constant current of claim 1 power supply with an automatic light meter, it is characterized in that comprising high frequency integrated switch power chip IC in the described high-frequency integrated circuit (5) that contains switching power source chip 5, diode D 51, D 52, capacitor C 5, C 51, C 52, inductance L 51, L 52And resistance R 50, R 51, R 53, R 55
7. by the described constant current of claim 6 power supply with an automatic light meter, it is characterized in that chip IC 5Adopt PI company power supply control chip series; Diode D 51Select the Zener voltage-stabiliser tube for use.
8. by the described constant current of claim 1 power supply with an automatic light meter, it is characterized in that comprising opto-coupler chip IC in the daylighting light modulation shunt circuit (6) 6, triode Q 6, photo resistance R 60, adjustable resistance R 61With fixed resistance R62, R 63, R 64And capacitor C 61
CNU2008200629085U 2008-04-14 2008-04-14 Constant-current automatic light regulating electric source for LED traffic light Expired - Fee Related CN201178507Y (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101801129A (en) * 2010-01-28 2010-08-11 海洋王照明科技股份有限公司 LED low-power drive circuit and LED lamp
CN102695330A (en) * 2011-03-22 2012-09-26 立锜科技股份有限公司 Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof
CN103124461A (en) * 2013-01-21 2013-05-29 厦门海莱照明有限公司 LED linear intelligent dimming module
WO2013097692A1 (en) * 2011-12-31 2013-07-04 四川新力光源股份有限公司 Alternating current direct drive led light-emitting device
CN101572972B (en) * 2009-06-04 2014-10-01 广州冠今电子科技有限公司 Dimmable LED constant-current drive circuit
CN104219819A (en) * 2013-05-30 2014-12-17 深圳市海洋王照明工程有限公司 Dimming circuit and lamp thereof
WO2015070492A1 (en) * 2013-11-13 2015-05-21 深圳市东方之星电源有限公司 Open-loop hiccup protective circuit of constant-current power supply
WO2019227272A1 (en) * 2018-05-28 2019-12-05 Tridonic Gmbh & Co Kg Lighting interface circuit, controlling method and lighting equipment

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101572972B (en) * 2009-06-04 2014-10-01 广州冠今电子科技有限公司 Dimmable LED constant-current drive circuit
CN101801129A (en) * 2010-01-28 2010-08-11 海洋王照明科技股份有限公司 LED low-power drive circuit and LED lamp
CN102695330A (en) * 2011-03-22 2012-09-26 立锜科技股份有限公司 Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof
CN102695330B (en) * 2011-03-22 2014-11-12 立锜科技股份有限公司 Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof
WO2013097692A1 (en) * 2011-12-31 2013-07-04 四川新力光源股份有限公司 Alternating current direct drive led light-emitting device
CN103124461B (en) * 2013-01-21 2015-04-01 厦门海莱照明有限公司 LED linear intelligent dimming module
CN103124461A (en) * 2013-01-21 2013-05-29 厦门海莱照明有限公司 LED linear intelligent dimming module
CN104219819A (en) * 2013-05-30 2014-12-17 深圳市海洋王照明工程有限公司 Dimming circuit and lamp thereof
CN104219819B (en) * 2013-05-30 2016-12-28 深圳市海洋王照明工程有限公司 Light adjusting circuit and light fixture thereof
WO2015070492A1 (en) * 2013-11-13 2015-05-21 深圳市东方之星电源有限公司 Open-loop hiccup protective circuit of constant-current power supply
WO2019227272A1 (en) * 2018-05-28 2019-12-05 Tridonic Gmbh & Co Kg Lighting interface circuit, controlling method and lighting equipment
GB2588715A (en) * 2018-05-28 2021-05-05 Tridonic Gmbh & Co Kg Lighting interface circuit, controlling method and lighting equipment
GB2588715B (en) * 2018-05-28 2022-05-25 Tridonic Gmbh & Co Kg Lighting interface circuit, controlling method and lighting equipment

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Granted publication date: 20090107