CN102956110B - LED traffic signal lamp and drive circuit thereof - Google Patents
LED traffic signal lamp and drive circuit thereof Download PDFInfo
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- CN102956110B CN102956110B CN201110239094.4A CN201110239094A CN102956110B CN 102956110 B CN102956110 B CN 102956110B CN 201110239094 A CN201110239094 A CN 201110239094A CN 102956110 B CN102956110 B CN 102956110B
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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
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Abstract
The invention belongs to the field of LED drive and provides an LED traffic signal lamp and a drive circuit thereof. The drive circuit of the LED traffic signal lamp comprises a starting circuit which comprises a starting voltage generation unit, a switch unit, a voltage comparison unit and a high-frequency filter unit, so that an LED load is provided with working voltage rapidly, the starting voltage generation unit is turned off rapidly after the working voltage is set, time delay of starting and turning off are effectively decreased, and the problem that an existing drive circuit of an LED traffic signal lamp is seriously time-delayed in starting and turning off and long in turn on delay is solved.
Description
Technical field
The invention belongs to LED and drive field, relate in particular to a kind of LED traffic lights and driving circuit thereof.
Background technology
In road traffic, traffic lights are as a kind of traffic administration aid, standard urban highway traffic order, be conducive to reduce the generation of traffic hazard, improved the service efficiency of road.In recent years, due to the continuous expansion of LED range of application, LED also replaces incandescent lamp to be applied in traffic lights as principal light source gradually.
At present, the driving circuit that existing LED traffic lights adopt is by metal-oxide-semiconductor, as on-off element, to control the shutoff of its inner start-up circuit.Yet, owing to controlling the triode of metal-oxide-semiconductor gate-source voltage, by a storage capacitor, supply with collector voltage, when closing, input ac voltage has no progeny while opening immediately, this storage capacitor fails to discharge in time electric energy, while causing start-up circuit again to start, there is startup hysteresis, start delay time lengthens, also make start-up circuit in follow-up shutoff, occur serious hysteresis, affected the flicker of LED traffic lights and replaced, thereby make LED traffic lights occur bright light mistake, even cannot normally work.
Therefore, the driving circuit of existing LED traffic lights exists to start and turn-off and seriously lags behind and the long problem of start delay time.
Summary of the invention
The object of the present invention is to provide a kind of LED traffic signals lamp drive circuit, be intended to solve the driving circuit existence startup of existing LED traffic lights and turn-off the serious problem that lags behind and start shooting delay time length.
The present invention realizes like this, a kind of LED traffic signals lamp drive circuit, be connected with AC power, LED load and reference power supply, comprise EMI filtering circuit, input rectifying filtering circuit, pwm control circuit, DC-DC transforming circuit, output rectifier and filter, sampling feedback circuit and start-up circuit, described start-up circuit comprises:
Trigger voltage generation unit, the output terminal of input rectifying filtering circuit described in input termination, trigger voltage output terminal is connected with the voltage input end of described pwm control circuit and the isolation end of described DC-DC transforming circuit simultaneously, is used to described pwm control circuit that trigger voltage is provided;
Switch element, first input end connects the output terminal of described output rectifier and filter, the second input end discharges end with the electric energy of described trigger voltage generation unit respectively with output terminal and is connected with control end, for described trigger voltage generation unit being carried out to working state control according to the output voltage of described output rectifier and filter;
Voltage comparison unit, the output terminal of output rectifier and filter described in driving voltage termination, the control end of switch element described in output termination, the output terminal of reference power supply described in reference voltage termination, for controlling the duty of described switch element according to the situation of change of described LED load output end current;
High frequency filter unit, the output terminal of LED load described in input termination, the input end of voltage comparison unit described in output termination, the high-frequency interferencing signal being mingled with for the work loop to described LED load carries out filtering.
Another object of the present invention is also to provide a kind of LED traffic lights that comprise described LED traffic signals lamp drive circuit.
In the present invention, by adopt the described start-up circuit that comprises described trigger voltage generation unit, described switch element, described voltage comparison unit and described High frequency filter unit in described LED traffic signals lamp drive circuit, realized as described LED load Quick is for operating voltage, and set up the rear trigger voltage generation unit that turn-offs rapidly in operating voltage, effectively reduced and started and the hysteresis phenomenon of turn-offing, solved the driving circuit existence startup of existing LED traffic lights and turn-off the serious problem that lags behind and start shooting delay time length.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the LED traffic signals lamp drive circuit that provides of the embodiment of the present invention;
Fig. 2 is the exemplary circuit structural drawing of the LED traffic signals lamp drive circuit that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the modular structure of the LED traffic signals lamp drive circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
LED traffic signals lamp drive circuit is connected with AC power 200, LED load 900 and reference power supply 1000, comprise EMI filtering circuit 300, input rectifying filtering circuit 400, pwm control circuit 500, DC-DC transforming circuit 600, output rectifier and filter 700, sampling feedback circuit 800 and start-up circuit 100, start-up circuit 100 comprises:
Trigger voltage generation unit 101, the output terminal of input termination input rectifying filtering circuit 400, trigger voltage output terminal is connected with the voltage input end of pwm control circuit 500 and the isolation end of DC-DC transforming circuit 600 simultaneously, is used to pwm control circuit 500 that trigger voltage is provided;
Switch element 102, first input end connects the output terminal of output rectifier and filter 700, the second input end discharges end with the electric energy of trigger voltage generation unit 101 respectively with output terminal and is connected with control end, for trigger voltage generation unit 101 being carried out to working state control according to the output voltage of output rectifier and filter 700;
Voltage comparison unit 103, the output terminal of driving voltage termination output rectifier and filter 700, the control end of output termination switch element 102, the output terminal of reference voltage termination reference power supply 1000, for according to the duty of the situation of change gauge tap unit 102 of LED load 900 output end currents;
High frequency filter unit 104, the output terminal of input termination LED load 900, the input end of output termination voltage comparison unit 103, the high-frequency interferencing signal being mingled with for the work loop to LED load 900 carries out filtering;
Start-up circuit 100 also comprises a sampling resistor R6, and sampling resistor R6 is connected between the output terminal of LED load 900 and the loop end of DC-DC transforming circuit 600, for generating corresponding sampled voltage according to the situation of change of LED load 900 output end currents.
In embodiments of the present invention, the output terminal of the input termination AC power 200 of EMI filtering circuit 300, the output terminal of the input termination EMI filtering circuit 300 of input rectifying filtering circuit 400, the output terminal of the input termination input rectifying filtering circuit 400 of DC-DC transforming circuit 600, the output terminal of the input termination DC-DC transforming circuit 600 of output rectifier and filter 700, the input end of LED load 900 and output terminal respectively with the output terminal of output rectifier and filter 700 and the first end of sampling resistor R6, the loop end of the second termination DC-DC transforming circuit 600 of sampling resistor R6.
Fig. 2 shows the exemplary circuit structure of the LED traffic signals lamp drive circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
As one embodiment of the invention, trigger voltage generation unit 101 comprises:
Resistance R 1, resistance R 2, N-type metal-oxide-semiconductor Q1, resistance R 3, storage capacitor C1, voltage stabilizing diode ZD1, diode D1 and voltage stabilizing diode ZD2;
The first end of resistance R 1 is the input end of trigger voltage generation unit 101, the first end of the first end connecting resistance R1 of resistance R 2, the second end of the drain electrode connecting resistance R1 of N-type metal-oxide-semiconductor Q1, the grid of N-type metal-oxide-semiconductor Q1 is the control end of trigger voltage generation unit 101, the first end while of resistance R 3 and the grid of N-type metal-oxide-semiconductor Q1, the second end of resistance R 2 and the anode of diode D1 are connected, the second end while of resistance R 3 and the source electrode of N-type metal-oxide-semiconductor Q1, the negative electrode of voltage stabilizing diode ZD1 is connected with the anode of voltage stabilizing diode ZD2, the anode of voltage stabilizing diode ZD1 connects equipotential ground, the negative electrode of voltage stabilizing diode ZD2 connects the negative electrode of diode D1, the anode of voltage stabilizing diode ZD2 is the trigger voltage output terminal of trigger voltage generation unit 101, the electric energy of the just very trigger voltage generation unit 101 of storage capacitor C1 discharges end, the positive pole of storage capacitor C1 connects equipotential ground.
As one embodiment of the invention, switch element 102 comprises:
NPN type triode Q2, photoelectrical coupler U1, resistance R 4, resistance R 5, resistance R 7, NPN type triode Q3, resistance R 8 and resistance R 9;
The current collection of NPN type triode Q2 is the output terminal of switch element 102 very, the emitter of NPN type triode Q2 connects equipotential ground, resistance R 4 is connected between the emitter of phototriode in the grid of NPN type triode Q2 and photoelectrical coupler U1, resistance R 5 is connected between the grid and equipotential ground of NPN type triode Q2, the current collection of phototriode the second input end of switch element 102 very in photoelectrical coupler U1, the first end of resistance R 7 is the first input end of switch element 102, the anode of light emitting diode in the second termination photoelectrical coupler U1 of resistance R 7, the collector of NPN type triode Q3 connects the negative electrode of light emitting diode in photoelectrical coupler U1, the grounded emitter of NPN type triode Q3, the base stage of NPN type triode Q3 is connected with the first end of resistance R 8 and the first end of resistance R 9 simultaneously, the second end of resistance R 8 is the control end of switch element 102, the second end ground connection of resistance R 9.
As one embodiment of the invention, voltage comparison unit 103 comprises:
Diode D4, resistance R 10 and comparer U2;
The positive power source terminal of comparer U2, in-phase input end, inverting input and output terminal are respectively driving voltage end, input end, reference voltage terminal and the output terminal of voltage comparison unit 103, the negative power end ground connection of comparer U2, the anode of diode D4 is connected with the first end of resistance R 10 with the output terminal of comparer U2 respectively with negative electrode, the in-phase input end of the second termination comparer U2 of resistance R 10.
As one embodiment of the invention, High frequency filter unit 104 comprises resistance R 11 and capacitor C 2, and the first end of resistance R 11 and the second end are respectively input end and the output terminal of High frequency filter unit 104, and capacitor C 2 is connected between second end and ground of resistance R 11.
The principle of work of LED traffic signals lamp drive circuit is:
In AC power after EMI filtering circuit output AC electricity, by EMI filtering circuit, alternating current is carried out exporting input rectifying filtering circuit to after static noise and surge voltage filtering, alternating current becomes direct current after input rectifying filtering circuit carries out rectifying and wave-filtering, this direct current divides two-way to enter subsequent conditioning circuit, the first end of the first end of one routing resistance R1 and resistance R 2 enters trigger voltage generation unit, and another road enters DC-DC voltage transformation unit.
Direct current enters after trigger voltage generation unit, the grid of N-type metal-oxide-semiconductor Q1 is high level, so, N-type metal-oxide-semiconductor Q1 conducting, direct current is that storage capacitor C1 charges by the source electrode of N-type metal-oxide-semiconductor Q1, PWM control module is started working when the voltage of storage capacitor C1 reaches its trigger voltage, controlling DC-DC voltage transformation unit processes galvanic transformation, direct current after transformation is undertaken exporting LED load 900 to after rectifying and wave-filtering by output rectification filter unit, thereby drives LED 1, LED 2 and LED 3 to enter duty.In trigger voltage generation unit, voltage stabilizing diode ZD1 carries out clamper to the voltage of storage capacitor C1, the input voltage that guarantees PWM control module is no more than its rated operational voltage, voltage stabilizing diode ZD2 carries out clamper to the grid-source voltage of N-type metal-oxide-semiconductor Q1, guarantees that N-type metal-oxide-semiconductor Q1 can be not excessive and breakdown because of grid-source voltage.
DC voltage in output rectifier and filter output reaches after the trigger voltage of LED load 900, the output terminal of LED load 900 starts to have electric current output, so, R6 resistance two ends form voltage difference, resistance R 11 is obtained the voltage of LED load 900 output terminals from the first end of sampling resistor R6, and by capacitor C 2, it is carried out exporting to after filtering the in-phase input end of comparer U2, if the voltage of LED load 900 output terminals is higher than the reference voltage of the inverting input of comparer U2, the output terminal of comparer U2 is high level output, this high level after resistance R 8 and resistance R 9 are carried out dividing potential drop for NPN type triode Q3 provides bias voltage, NPN type triode Q3 conducting, its collector voltage declines, again because resistance R 7 is obtained DC voltage from the output terminal of output rectifier and filter, so, light emitting diode conducting in photoelectrical coupler U1, phototriode conducting after obtaining illumination in photoelectrical coupler U1, and draw electric current from the positive pole of storage capacitor C1, in 5 couples of photoelectrical coupler U1 of resistance R 4 and resistance R, the voltage of the emitter of phototriode output carries out after dividing potential drop, for NPN type triode, Q2 provides bias voltage, NPN type triode Q2 conducting, and by its collector, the grid voltage of N-type metal-oxide-semiconductor Q1 is dragged down, N-type metal-oxide-semiconductor Q1 cut-off, thereby reach after the operating voltage of LED load 900 is set up, turn-off rapidly the object of trigger voltage generation unit, for flicker and the alternation of follow-up LED load 900 provides condition, in addition, N-type metal-oxide-semiconductor Q1 rapid cut-off after conducting can be saved energy consumption, increases work efficiency, and avoid continuing the phenomenon generation that the caused device heating of conducting even damages after LED load 900 obtains operating voltage.
If the voltage of the output terminal of LED load 900 is less than reference voltage, prove that whole LED traffic signals lamp drive circuit not yet completes the foundation to LED load 900 operating voltage, so, comparer U2 output low level, NPN type triode Q3 cut-off, photoelectrical coupler U1 no current passes through, and NPN type triode Q2 also ends, still conducting of N-type metal-oxide-semiconductor Q1, and continue storage capacitor C1 to charge.
The embodiment of the present invention also provides a kind of LED traffic lights that comprise above-mentioned LED traffic signals lamp drive circuit.
In embodiments of the present invention, by adopt the start-up circuit 100 that comprises trigger voltage generation unit 101, switch element 102, voltage comparison unit 103 and High frequency filter unit 104 in LED traffic signals lamp drive circuit, realized as LED load 900 Quicks are for operating voltage, and set up the rear trigger voltage generation unit 101 that turn-offs rapidly in operating voltage, effectively reduced and started and the hysteresis phenomenon of turn-offing, solved the driving circuit existence startup of existing LED traffic lights and turn-off the serious problem that lags behind and start shooting delay time length.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a LED traffic signals lamp drive circuit, be connected with AC power, LED load and reference power supply, comprise EMI filtering circuit, input rectifying filtering circuit, pwm control circuit, DC-DC transforming circuit, output rectifier and filter, sampling feedback circuit and start-up circuit, it is characterized in that, described start-up circuit comprises:
Trigger voltage generation unit, the output terminal of input rectifying filtering circuit described in its input termination, its trigger voltage output terminal is connected with the voltage input end of described pwm control circuit and the isolation end of described DC-DC transforming circuit simultaneously, is used to described pwm control circuit that trigger voltage is provided;
Switch element, its first input end connects the output terminal of described output rectifier and filter, its second input end discharges end with the electric energy of described trigger voltage generation unit respectively with output terminal and is connected with control end, for described trigger voltage generation unit being carried out to working state control according to the output voltage of described output rectifier and filter;
Voltage comparison unit, the output terminal of output rectifier and filter described in its driving voltage termination, the control end of switch element described in its output termination, the output terminal of reference power supply described in its reference voltage termination, for controlling the duty of described switch element according to the situation of change of described LED load output end current;
High frequency filter unit, the output terminal of LED load described in its input termination, the input end of voltage comparison unit described in its output termination, the high-frequency interferencing signal being mingled with for the work loop to described LED load carries out filtering.
2. LED traffic signals lamp drive circuit as claimed in claim 1, it is characterized in that, described start-up circuit also comprises a sampling resistor R6, described sampling resistor R6 is connected between the output terminal of described LED load and the loop end of described DC-DC transforming circuit, for generating corresponding sampled voltage according to the situation of change of described LED load output end current.
3. LED traffic signals lamp drive circuit as claimed in claim 1, is characterized in that, described trigger voltage generation unit comprises:
Resistance R 1, resistance R 2, N-type metal-oxide-semiconductor Q1, resistance R 3, storage capacitor C1, voltage stabilizing diode ZD1, diode D1 and voltage stabilizing diode ZD2;
The first end of described resistance R 1 is the input end of described trigger voltage generation unit, the first end of resistance R 1 described in the first termination of described resistance R 2, the drain electrode of described N-type metal-oxide-semiconductor Q1 connects the second end of described resistance R 1, the grid of described N-type metal-oxide-semiconductor Q1 is the control end of described trigger voltage generation unit 101, the first end while of described resistance R 3 and the grid of described N-type metal-oxide-semiconductor Q1, the second end of described resistance R 2 and the anode of described diode D1 are connected, the second end while of described resistance R 3 and the source electrode of described N-type metal-oxide-semiconductor Q1, the negative electrode of described voltage stabilizing diode ZD1 is connected with the anode of described voltage stabilizing diode ZD2, the anode of described voltage stabilizing diode ZD1 connects equipotential ground, the negative electrode of described voltage stabilizing diode ZD2 connects the negative electrode of described diode D1, the anode of described voltage stabilizing diode ZD2 is the trigger voltage output terminal of described trigger voltage generation unit, the electric energy of the just very described trigger voltage generation unit of described storage capacitor C1 discharges end, the positive pole of described storage capacitor C1 connects equipotential ground.
4. LED traffic signals lamp drive circuit as claimed in claim 1, is characterized in that, described switch element comprises:
NPN type triode Q2, photoelectrical coupler U1, resistance R 4, resistance R 5, resistance R 7, NPN type triode Q3, resistance R 8 and resistance R 9;
The output terminal of the very described switch element of current collection of described NPN type triode Q2, the emitter of described NPN type triode Q2 connects equipotential ground, described resistance R 4 is connected between the emitter of phototriode in the grid of described NPN type triode Q2 and described photoelectrical coupler U1, described resistance R 5 is connected between the grid and equipotential ground of described NPN type triode Q2, the second input end of the very described switch element of current collection of phototriode in described photoelectrical coupler U1, the first end of described resistance R 7 is the first input end of described switch element, the anode of light emitting diode in photoelectrical coupler U1 described in the second termination of described resistance R 7, the collector of described NPN type triode Q3 connects the negative electrode of light emitting diode in described photoelectrical coupler U1, the grounded emitter of described NPN type triode Q3, the base stage of described NPN type triode Q3 is connected with the first end of described resistance R 8 and the first end of described resistance R 9 simultaneously, the control end that the second end of described resistance R 8 is described switch element, the second end ground connection of described resistance R 9.
5. LED traffic signals lamp drive circuit as claimed in claim 1, is characterized in that, described voltage comparison unit comprises:
Diode D4, resistance R 10 and comparer U2;
The positive power source terminal of described comparer U2, in-phase input end, inverting input and output terminal are respectively driving voltage end, input end, reference voltage terminal and the output terminal of described voltage comparison unit, the negative power end ground connection of described comparer U2, the anode of described diode D4 is connected with the first end of described resistance R 10 with the output terminal of described comparer U2 respectively with negative electrode, the in-phase input end of comparer U2 described in the second termination of described resistance R 10.
6. LED traffic signals lamp drive circuit as claimed in claim 1, it is characterized in that, described High frequency filter unit comprises resistance R 11 and capacitor C 2, the first end of described resistance R 11 and the second end are respectively input end and the output terminal of described High frequency filter unit, and described capacitor C 2 is connected between second end and ground of described resistance R 11.
7. LED traffic lights, is characterized in that, described LED traffic lights comprise the LED traffic signals lamp drive circuit as described in claim 1 to 6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110239094.4A CN102956110B (en) | 2011-08-19 | 2011-08-19 | LED traffic signal lamp and drive circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110239094.4A CN102956110B (en) | 2011-08-19 | 2011-08-19 | LED traffic signal lamp and drive circuit thereof |
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| CN102956110A CN102956110A (en) | 2013-03-06 |
| CN102956110B true CN102956110B (en) | 2014-12-10 |
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| CN103473942B (en) * | 2013-08-30 | 2015-07-08 | 深圳市法马新智能设备有限公司 | Traffic signal countdown control device |
| CN105338690B (en) * | 2014-08-15 | 2018-07-17 | 赛尔富电子有限公司 | A kind of LED dimming power sources |
| CN105429120A (en) * | 2015-11-19 | 2016-03-23 | 广州中逸光电子科技有限公司 | Surge current suppression circuit |
| CN108495417A (en) * | 2018-04-20 | 2018-09-04 | 天津光电丰泰科技有限公司 | A kind of circuit system and its design method of railway signal LED bulb |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20120014077A (en) * | 2003-06-30 | 2012-02-15 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | Single led driver for a traffic light |
| CN200947687Y (en) * | 2006-09-27 | 2007-09-12 | 佛山市国星光电科技有限公司 | Multifunctional LED traffic lamp based on sensible drive circuit |
| CN101896951A (en) * | 2007-12-03 | 2010-11-24 | 奥尔德里奇交通系统私人有限公司 | An LED driver method for traffic lanterns |
| CN201750593U (en) * | 2010-06-29 | 2011-02-16 | 深圳市斯派克光电科技有限公司 | Drive power source circuit of LED traffic light |
| CN202177974U (en) * | 2011-08-19 | 2012-03-28 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
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Address after: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: CHINA GREAT WALL TECHNOLOGY GROUP Co.,Ltd. Address before: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: CHINA GREATWALL COMPUTER SHENZHEN Co.,Ltd. |
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Granted publication date: 20141210 |