CN102956110A - LED traffic signal lamp and drive circuit thereof - Google Patents
LED traffic signal lamp and drive circuit thereof Download PDFInfo
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- CN102956110A CN102956110A CN2011102390944A CN201110239094A CN102956110A CN 102956110 A CN102956110 A CN 102956110A CN 2011102390944 A CN2011102390944 A CN 2011102390944A CN 201110239094 A CN201110239094 A CN 201110239094A CN 102956110 A CN102956110 A CN 102956110A
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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
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 the 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 the urban highway traffic order, be conducive to reduce the generation of traffic hazard, improved the service efficiency of road.In recent years, because the continuous expansion of LED range of application, LED also replaces incandescent lamp to be applied in the traffic lights as principal light source gradually.
At present, the driving circuit that adopts of existing LED traffic lights is the shutoff of controlling its inner start-up circuit by metal-oxide-semiconductor as on-off element.Yet, because the triode of control metal-oxide-semiconductor gate-source voltage is supplied with collector voltage by a storage capacitor, when closing, input ac voltage has no progeny when opening immediately, this storage capacitor fails in time to discharge electric energy, startup hysteresis appears when causing start-up circuit again to start, the start delay time lengthens, also make start-up circuit serious the hysteresis in follow-up shutoff, occur, affected the flicker of LED traffic lights and alternately, thereby make the LED traffic lights bright light mistake occur, even can't work.
Therefore, there is startup in the driving circuit of existing LED traffic lights and turn-offs serious hysteresis and the problem of start delay time length.
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:
The trigger voltage generation unit, the output terminal of the described input rectifying filtering circuit of input termination, the 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, is used for according to the output voltage of described output rectifier and filter described trigger voltage generation unit being carried out working state control;
Voltage comparison unit, the output terminal of the described output rectifier and filter of driving voltage termination, the control end of the described switch element of output termination, the output terminal of the described reference power supply of reference voltage termination is for the duty of controlling described switch element according to the situation of change of described LED load output end current;
The High frequency filter unit, the output terminal of the described LED load of input termination, the input end of the described voltage comparison unit of output termination, the high-frequency interferencing signal that is mingled with for the work loop to described LED load carries out filtering.
Another object of the present invention also is to provide a kind of LED traffic lights that comprise described LED traffic signals lamp drive circuit.
In the present invention, by in described LED traffic signals lamp drive circuit, adopting 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, realized supplying operating voltage for described LED load Quick, and at the rear trigger voltage generation unit that turn-offs rapidly of operating voltage foundation, effectively reduced the hysteresis phenomenon that starts with shutoff, there is startup in the driving circuit that solves existing LED traffic lights and turn-offs serious hysteresis and the problem of start delay time length.
Description of drawings
Fig. 1 is the modular structure figure of the LED traffic signals lamp drive circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit structural drawing of the LED traffic signals lamp drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose 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 invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the 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, the 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;
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 that is 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 loop end of the output terminal of LED load 900 and DC-DC transforming circuit 600, is used 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 invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the 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, and 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 among the grid of NPN type triode Q2 and the 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 among the 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 among 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 among the 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 the first end of being connected with resistance R with the output terminal of comparer U2 and is connected 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 behind EMI filtering circuit output AC electricity, by the EMI filtering circuit alternating current is carried out exporting the input rectifying filtering circuit to after static noise and the surge voltage filtering, alternating current is undertaken becoming direct current behind the rectifying and wave-filtering by the input rectifying filtering circuit, 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 the trigger voltage generation unit, and another road enters the DC-DC voltage transformation unit.
After direct current enters the 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 storage capacitor C1 charging by the source electrode of N-type metal-oxide-semiconductor Q1, the PWM control module is started working when the voltage of storage capacitor C1 reaches its trigger voltage, control DC-DC voltage transformation unit is processed galvanic transformation, direct current after the transformation is undertaken exporting LED load 900 to behind the rectifying and wave-filtering by the output rectification filter unit, enters duty thereby drive LED 1, LED 2 and LED 3.In the trigger voltage generation unit, voltage stabilizing diode ZD1 carries out clamper to the voltage of storage capacitor C1, the input voltage that guarantees the 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.
After the dc voltage of output rectifier and filter output reaches the trigger voltage of LED load 900, the output terminal of LED load 900 begins 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 the filtering 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, then the output terminal of comparer U2 is high level output, this high level carries out providing bias voltage for NPN type triode Q3 after the dividing potential drop through resistance R 8 and resistance R 9, NPN type triode Q3 conducting, its collector voltage descends, again because resistance R 7 is obtained dc voltage from the output terminal of output rectifier and filter, so, light emitting diode conducting among the photoelectrical coupler U1, phototriode conducting after obtaining illumination among the photoelectrical coupler U1, and draw electric current from the positive pole of storage capacitor C1, after the voltage of the emitter of phototriode output carries out dividing potential drop among 5 couples of photoelectrical coupler U1 of resistance R 4 and resistance R, Q2 provides bias voltage for NPN type triode, NPN type triode Q2 conducting, and drag down by the grid voltage of its collector with N-type metal-oxide-semiconductor Q1, 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 purpose 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, increase work efficiency, and the phenomenon of avoiding continuing the caused device heating of conducting even damage after LED load 900 obtains operating voltage occurs.
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 finishes 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 then NPN type triode Q2 also ends, still conducting of N-type metal-oxide-semiconductor Q1, and continue storage capacitor C1 is charged.
The embodiment of the 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 in LED traffic signals lamp drive circuit, adopting 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, realized supplying operating voltage for LED load 900 Quicks, and at the rear trigger voltage generation unit 101 that turn-offs rapidly of operating voltage foundation, effectively reduced the hysteresis phenomenon that starts with shutoff, there is startup in the driving circuit that solves existing LED traffic lights and turn-offs serious hysteresis and the problem of start delay time length.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. 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:
The trigger voltage generation unit, the output terminal of the described input rectifying filtering circuit of input termination, the 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, is used for according to the output voltage of described output rectifier and filter described trigger voltage generation unit being carried out working state control;
Voltage comparison unit, the output terminal of the described output rectifier and filter of driving voltage termination, the control end of the described switch element of output termination, the output terminal of the described reference power supply of reference voltage termination is for the duty of controlling described switch element according to the situation of change of described LED load output end current;
The High frequency filter unit, the output terminal of the described LED load of input termination, the input end of the described voltage comparison unit of output termination, the high-frequency interferencing signal that is 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 loop end of the output terminal of described LED load and described DC-DC transforming circuit, is used 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 the described resistance R 1 of 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, and 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 among the grid of described NPN type triode Q2 and the 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 among the 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 among the described photoelectrical coupler U1 of the second termination of described resistance R 7, the collector of described NPN type triode Q3 connects the negative electrode of light emitting diode among the 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 second end of described resistance R 8 is the control end of 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 be connected with negative electrode with the output terminal of described comparer U2 be connected the first end of resistance R 10 and be connected the in-phase input end of the described comparer U2 of 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 such as the described LED traffic signals of claim 1 to 6 any one lamp drive circuit.
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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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| CN201110239094.4A CN102956110B (en) | 2011-08-19 | 2011-08-19 | LED traffic signal lamp and drive circuit thereof |
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| CN103473942A (en) * | 2013-08-30 | 2013-12-25 | 深圳市法马新智能设备有限公司 | Traffic signal countdown control device |
| CN105338690A (en) * | 2014-08-15 | 2016-02-17 | 宁波高新区赛尔富电子有限公司 | LED dimming power source |
| 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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| 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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| CN102956110B (en) | 2014-12-10 |
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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 |