CN202177974U - LED traffic signal lamp and drive circuit thereof - Google Patents
LED traffic signal lamp and drive circuit thereof Download PDFInfo
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- CN202177974U CN202177974U CN201120303404XU CN201120303404U CN202177974U CN 202177974 U CN202177974 U CN 202177974U CN 201120303404X U CN201120303404X U CN 201120303404XU CN 201120303404 U CN201120303404 U CN 201120303404U CN 202177974 U CN202177974 U CN 202177974U
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Abstract
The utility model, belonging to the field of LED drive, provides an LED traffic signal lamp and a drive circuit thereof. In the LED traffic signal lamp, a starting circuit composed of a starting voltage generation unit, a switch unit, a voltage comparison unit and a high frequency filter unit is used in the drive circuit of the LED traffic signal lamp, which realizes that working voltage is quickly provided to the LED load, and the starting voltage generation unit is quickly switched off after the working voltage is generated, so that hysteresis phenomenon of starting and stopping is effectively reduced, and the problem that the drive circuit of the current LED traffic signal lamp has serious hysteresis phenomenon of starting and stopping and long starting delay time is solved.
Description
Technical field
The utility model belongs to LED and drives the field, relates 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, help reducing 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 main light source gradually.
At present, the driving circuit that adopted of existing LED traffic lights is through the shutoff of metal-oxide-semiconductor as its inner start-up circuit of on-off element control.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, and this storage capacitor fails in time to discharge electric energy; Occur when causing start-up circuit to start once more starting lagging behind; Start delay time lengthening also makes start-up circuit in follow-up shutoff, occur serious the hysteresis, has influenced the flicker of LED traffic lights and replaces; Thereby make the LED traffic lights bright lamp mistake occur, even can't operate as normal.
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.
The utility model content
The purpose of the utility model is to provide a kind of LED traffic signals lamp drive circuit, is intended to solve the driving circuit existence startup of existing LED traffic lights and turn-offs the serious problem that lags behind and start shooting delay time length.
The utility model is to realize 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, said start-up circuit comprises:
The output terminal of the said input rectifying filtering circuit of input termination; The trigger voltage output terminal is connected with the voltage input end of said pwm control circuit and the isolation end of said DC-DC transforming circuit simultaneously, and the trigger voltage generation unit of trigger voltage is provided for said pwm control circuit;
First input end connects the output terminal of said output rectifier and filter; Second input end discharges end with the electric energy of said trigger voltage generation unit respectively with output terminal and is connected with control end, said trigger voltage generation unit is carried out the switch element of duty control according to the output voltage of said output rectifier and filter;
The output terminal of the said output rectifier and filter of driving voltage termination; The control end of the said switch element of output termination; The output terminal of the said reference power supply of reference voltage termination is controlled the voltage comparison unit of the duty of said switch element according to the situation of change of said LED load output end current;
The output terminal of the said LED load of input termination, the input end of the said voltage comparison unit of output termination, the high-frequency interferencing signal that is mingled with in the work loop to said LED load carries out the High frequency filter unit of filtering.
Another purpose of the utility model also is to provide a kind of LED traffic lights that comprise said LED traffic signals lamp drive circuit.
In the utility model; Through in said LED traffic signals lamp drive circuit, adopting the said start-up circuit that comprises said trigger voltage generation unit, said switch element, said voltage comparison unit and said High frequency filter unit; Realized WV being provided fast for said LED load; And set up the back in WV and turn-off the trigger voltage generation unit rapidly; Reduced the hysteresis phenomenon that starts with shutoff effectively, 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 utility model embodiment;
Fig. 2 is the exemplary circuit structural drawing of the LED traffic signals lamp drive circuit that provides of the utility model embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the modular structure of the LED traffic signals lamp drive circuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, 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:
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, and the trigger voltage generation unit 101 of trigger voltage is provided for pwm control circuit 500;
First input end connects the output terminal of output rectifier and filter 700; 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, trigger voltage generation unit 101 is carried out the switch element 102 of duty control according to the output voltage of output rectifier and filter 700;
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 is according to the voltage comparison unit 103 of the duty of the situation of change control switch unit 102 of LED load 900 output end currents;
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 in the work loop to LED load 900 carries out the High frequency filter unit 104 of filtering;
Start-up circuit 100 also comprises a sampling resistor R6, and sampling resistor R6 is connected between the loop end of output terminal and DC-DC transforming circuit 600 of LED load 900, and sampling resistor R6 generates corresponding sampled voltage according to the situation of change of LED load 900 output end currents.
In the utility model embodiment; 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 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 utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
As the utility model one embodiment, 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;
First end of resistance R 1 is the input end of trigger voltage generation unit 101; First end of the first terminating resistor R1 of resistance R 2; 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; First end of resistance R 3 is connected with the grid of N type metal-oxide-semiconductor Q1, second end of resistance R 2 and the anode of diode D1 simultaneously, and second end of resistance R 3 is connected with the source electrode of N type metal-oxide-semiconductor Q1, the negative electrode of voltage stabilizing diode ZD1 and the anode of voltage stabilizing diode ZD2 simultaneously, and 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, and 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 the utility model one embodiment, 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 grid and the photoelectrical coupler U1 of NPN type triode Q2; Resistance R 5 is connected between the grid and equipotential ground of NPN type triode Q2, the current collection of phototriode second input end of switch element 102 very among the photoelectrical coupler U1, and 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, and the base stage of NPN type triode Q3 is connected with first end of resistance R 8 and first end of resistance R 9 simultaneously; Second end of resistance R 8 is the control end of switch element 102, the second end ground connection of resistance R 9.
As the utility model one embodiment, 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 in-phase input end of the second termination comparer U2 of resistance R 10 with the output terminal of comparer U2 and first end of resistance R 10 respectively with negative electrode.
As the utility model one embodiment, High frequency filter unit 104 comprises resistance R 11 and capacitor C 2, and first end of resistance R 11 and second end are respectively the 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 get into subsequent conditioning circuit, and first end of a routing resistance R1 and first end of resistance R 2 get into the trigger voltage generation unit, and another road gets into the DC-DC voltage transformation unit.
After direct current gets into the trigger voltage generation unit; The grid of N type metal-oxide-semiconductor Q1 is a high level; So, N type metal-oxide-semiconductor Q1 conducting, direct current is storage capacitor C1 charging through 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 handled galvanic transformation, and the direct current after the transformation is undertaken exporting LED load 900 to behind the rectifying and wave-filtering by the output rectification filtering unit, thereby driven for emitting lights diode (LED) 1, LED 2 and LED 3 get into duty.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 reached the trigger voltage of LED load 900, the output terminal of LED load 900 began to have electric current output, so; R6 resistance two ends form voltage difference, and resistance R 11 is obtained the voltage of LED load 900 output terminals from first end of sampling resistor R6, and by capacitor C 2 it are 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, and this high level carries out for NPN type triode Q3 bias voltage being provided 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 resistance R 4 and 5 couples of photoelectrical coupler U1 of resistance R; Q2 provides bias voltage for NPN type triode, NPN type triode Q2 conducting, and drag down through the grid voltage of its collector with N type metal-oxide-semiconductor Q1; N type metal-oxide-semiconductor Q1 ends; Thereby reach after the WV of LED load 900 is set up, the purpose of turn-offing the trigger voltage generation unit rapidly is for the flicker and the alternation of follow-up LED load 900 provides condition; In addition, N type metal-oxide-semiconductor Q1 rapidly by saving energy consumption, increases work efficiency after conducting, and the phenomenon of avoiding after LED load 900 obtains WV, continuing caused device heating of conducting even damage takes place.
If the voltage of the output terminal of LED load 900, proves whole LED traffic signals lamp drive circuit less than reference voltage and do not accomplish the foundation to LED load 900 WVs as yet, so; Comparer U2 output low level; NPN type triode Q3 ends, and photoelectrical coupler U1 no current passes through, and then NPN type triode Q2 also ends; N type metal-oxide-semiconductor Q1 conducting still, and continue storage capacitor C1 is charged.
The utility model embodiment also provides a kind of LED traffic lights that comprise above-mentioned LED traffic signals lamp drive circuit.
In the utility model embodiment; Through 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 WV being provided fast for LED load 900; And set up the back in WV and turn-off trigger voltage generation unit 101 rapidly; Reduced the hysteresis phenomenon that starts with shutoff effectively, 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 is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
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 said start-up circuit comprises:
The output terminal of the said input rectifying filtering circuit of input termination; The trigger voltage output terminal is connected with the voltage input end of said pwm control circuit and the isolation end of said DC-DC transforming circuit simultaneously, and the trigger voltage generation unit of trigger voltage is provided for said pwm control circuit;
First input end connects the output terminal of said output rectifier and filter; Second input end discharges end with the electric energy of said trigger voltage generation unit respectively with output terminal and is connected with control end, said trigger voltage generation unit is carried out the switch element of duty control according to the output voltage of said output rectifier and filter;
The output terminal of the said output rectifier and filter of driving voltage termination; The control end of the said switch element of output termination; The output terminal of the said reference power supply of reference voltage termination is controlled the voltage comparison unit of the duty of said switch element according to the situation of change of said LED load output end current;
The output terminal of the said LED load of input termination, the input end of the said voltage comparison unit of output termination, the high-frequency interferencing signal that is mingled with in the work loop to said LED load carries out the High frequency filter unit of filtering.
2. LED traffic signals lamp drive circuit as claimed in claim 1 is characterized in that said start-up circuit also comprises a sampling resistor R6, and said sampling resistor R6 is connected between the loop end of output terminal and said DC-DC transforming circuit of said LED load.
3. LED traffic signals lamp drive circuit as claimed in claim 1 is characterized in that, said 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;
First end of said resistance R 1 is the input end of said trigger voltage generation unit; First end of the said resistance R 1 of first termination of said resistance R 2; The drain electrode of said N type metal-oxide-semiconductor Q1 connects second end of said resistance R 1; The grid of said N type metal-oxide-semiconductor Q1 is the control end of said trigger voltage generation unit 101; First end of said resistance R 3 is connected with the grid of said N type metal-oxide-semiconductor Q1, second end of said resistance R 2 and the anode of said diode D1 simultaneously; Second end of said resistance R 3 is connected with the negative electrode of the source electrode of said N type metal-oxide-semiconductor Q1, said voltage stabilizing diode ZD1 and the anode of said voltage stabilizing diode ZD2 simultaneously; The anode of said voltage stabilizing diode ZD1 connects equipotential ground, and the negative electrode of said voltage stabilizing diode ZD2 connects the negative electrode of said diode D1, and the anode of said voltage stabilizing diode ZD2 is the trigger voltage output terminal of said trigger voltage generation unit; The electric energy of the just very said trigger voltage generation unit of said storage capacitor C1 discharges end, and the positive pole of said storage capacitor C1 connects equipotential ground.
4. LED traffic signals lamp drive circuit as claimed in claim 1 is characterized in that said 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 said switch element of current collection of said NPN type triode Q2; The emitter of said NPN type triode Q2 connects equipotential ground; Said resistance R 4 is connected between the emitter of phototriode among grid and the said photoelectrical coupler U1 of said NPN type triode Q2; Said resistance R 5 is connected between the grid and equipotential ground of said NPN type triode Q2; Second input end of the very said switch element of current collection of phototriode among the said photoelectrical coupler U1; First end of said resistance R 7 is the first input end of said switch element, the anode of light emitting diode among the said photoelectrical coupler U1 of second termination of said resistance R 7, and the collector of said NPN type triode Q3 connects the negative electrode of light emitting diode among the said photoelectrical coupler U1; The grounded emitter of said NPN type triode Q3; The base stage of said NPN type triode Q3 is connected with first end of said resistance R 8 and first end of said resistance R 9 simultaneously, and second end of said resistance R 8 is the control end of said switch element, the second end ground connection of said resistance R 9.
5. LED traffic signals lamp drive circuit as claimed in claim 1 is characterized in that said voltage comparison unit comprises:
Diode D4, resistance R 10 and comparer U2;
The positive power source terminal of said 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 said voltage comparison unit; The negative power end ground connection of said comparer U2; The anode of said diode D4 is connected the in-phase input end of the said comparer U2 of second termination of said resistance R 10 with the output terminal of said comparer U2 and first end of said resistance R 10 respectively with negative electrode.
6. LED traffic signals lamp drive circuit as claimed in claim 1; It is characterized in that; Said High frequency filter unit comprises resistance R 11 and capacitor C 2; First end of said resistance R 11 and second end are respectively the input end and the output terminal of said High frequency filter unit, and said capacitor C 2 is connected between second end and ground of said resistance R 11.
7. LED traffic lights is characterized in that, said LED traffic lights comprise like any described LED traffic signals lamp drive circuit of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120303404XU CN202177974U (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 |
|---|---|---|---|
| CN201120303404XU CN202177974U (en) | 2011-08-19 | 2011-08-19 | LED traffic signal lamp and drive circuit thereof |
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| CN202177974U true CN202177974U (en) | 2012-03-28 |
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| CN201120303404XU Expired - Lifetime CN202177974U (en) | 2011-08-19 | 2011-08-19 | LED traffic signal lamp and drive circuit thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956110A (en) * | 2011-08-19 | 2013-03-06 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
| CN103106800A (en) * | 2012-12-29 | 2013-05-15 | 上海澳星照明电器制造有限公司 | Driving power circuit of traffic light |
| CN103533721A (en) * | 2013-10-31 | 2014-01-22 | 矽力杰半导体技术(杭州)有限公司 | Pulse type current LED drive circuit |
| CN103680174A (en) * | 2013-12-04 | 2014-03-26 | 无锡安邦电气有限公司 | Low-impact-current high-power-factor energy storage type countdown display circuit |
| CN104023449A (en) * | 2014-06-18 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | Driving circuit of arrow-head-shaped traffic lights |
| WO2015024224A1 (en) * | 2013-08-22 | 2015-02-26 | Liu Xiaofeng | Led constant-current circuit and led lamp |
| 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 |
| CN106559933A (en) * | 2015-09-25 | 2017-04-05 | 光宝电子(广州)有限公司 | Traffic signal lamp drive circuit |
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2011
- 2011-08-19 CN CN201120303404XU patent/CN202177974U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956110A (en) * | 2011-08-19 | 2013-03-06 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
| CN103106800A (en) * | 2012-12-29 | 2013-05-15 | 上海澳星照明电器制造有限公司 | Driving power circuit of traffic light |
| WO2015024224A1 (en) * | 2013-08-22 | 2015-02-26 | Liu Xiaofeng | Led constant-current circuit and led lamp |
| CN103533721A (en) * | 2013-10-31 | 2014-01-22 | 矽力杰半导体技术(杭州)有限公司 | Pulse type current LED drive circuit |
| CN103680174A (en) * | 2013-12-04 | 2014-03-26 | 无锡安邦电气有限公司 | Low-impact-current high-power-factor energy storage type countdown display circuit |
| CN103680174B (en) * | 2013-12-04 | 2015-10-28 | 无锡安邦电气有限公司 | Low dash current high power factor energy storage type countdown display circuit |
| CN104023449A (en) * | 2014-06-18 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | Driving circuit of arrow-head-shaped traffic lights |
| 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 |
| CN105338690B (en) * | 2014-08-15 | 2018-07-17 | 赛尔富电子有限公司 | A kind of LED dimming power sources |
| CN106559933A (en) * | 2015-09-25 | 2017-04-05 | 光宝电子(广州)有限公司 | Traffic signal lamp drive circuit |
| CN106559933B (en) * | 2015-09-25 | 2018-03-27 | 光宝电子(广州)有限公司 | Traffic lights circuit arrangement |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120328 Effective date of abandoning: 20141210 |
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| RGAV | Abandon patent right to avoid regrant |