CN204090227U - The anti-flashing power circuit of a kind of traffic lights - Google Patents
The anti-flashing power circuit of a kind of traffic lights Download PDFInfo
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- CN204090227U CN204090227U CN201420471031.0U CN201420471031U CN204090227U CN 204090227 U CN204090227 U CN 204090227U CN 201420471031 U CN201420471031 U CN 201420471031U CN 204090227 U CN204090227 U CN 204090227U
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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 utility model discloses the anti-flashing power circuit of a kind of traffic lights, relate to traffic lights field.Comprise current rectifying and wave filtering circuit, constant current output circuit and input undervoltage protection circuit, wherein, input undervoltage protection circuit comprises the anti-fluctuation unit of input detection unit, input undervoltage protected location and input undervoltage.When the supply voltage inputted is lower than normal range (NR), will traffic lights be made still luminous by output current; When the supply voltage inputted is in critical value, output voltage can not be made to cut in and out and cause the light flash of traffic lights, increase the useful life of traffic lights.
Description
Technical field
The utility model relates to traffic lights field, is specifically related to the anti-flashing power circuit of a kind of traffic lights.
Background technology
Traffic lights are the important component parts in traffic safety equipment, are the basic languages of road traffic.Along with traffic signal system is popularized fast in the whole nation in recent years, the style of traffic lights and kind have been tending towards ripe and fixing.The light on and off state of existing traffic lights is generally do not need the input voltage of the signal lamp of giving out light to carry out to control by reducing, but sometimes still can occur should non-luminous signal lamp flashing fault occur, namely when input voltage is too low, traffic lights still can flashing, if continue always, the problem of traffic lights still flashing when easily causing input voltage too low, not only easily make traffic lights damage, also easily make pedestrian, driver etc. produce erroneous judgement, cause security incident.
Utility model content
?the purpose of this utility model is according to the deficiencies in the prior art, provides a kind of power circuit making traffic lights that flashing not occur when input voltage is too low.
For achieving the above object, the technical scheme that the utility model adopts is:
The anti-flashing power circuit of a kind of traffic lights, comprise current rectifying and wave filtering circuit, constant current output circuit and input undervoltage protection circuit, it is characterized in that: described input undervoltage protection circuit comprises the anti-fluctuation unit of input detection unit, input undervoltage protected location and input undervoltage;
Described input undervoltage detecting unit comprises resistance R33, R32 and R35 of being connected in series, the resistance R33 other end is connected to the voltage input end A of described input undervoltage protection circuit, is connected with the reference pole of accurate adjustable linear voltage regulator TL431 between resistance R32 and R35;
Described input undervoltage protected location comprises resistance R31, R36 and electric capacity C19 of being connected in series, the anode of close adjustable linear voltage regulator TL431 is connected with between resistance R36 and electric capacity C19, hinder between R36 and electric capacity C19 simultaneously and go back reverse parallel connection voltage stabilizing didoe ZD5, the positive pole of this voltage stabilizing didoe ZD5 is connected with the base stage of triode Q5;
The resistance R34 that the anti-fluctuation unit of described input undervoltage comprises diode D8 and is connected with its negative pole; simultaneously; the positive pole of diode D8 is parallel between resistance R32 and R35, and resistance R34 is connected with the collector electrode of triode Q5, as the output of described input undervoltage protection circuit.
Technique effect of the present utility model:
1, when the supply voltage inputted is lower than normal range (NR), will traffic lights be made still luminous by output current; When the supply voltage inputted is in critical value, output voltage can not be made to cut in and out and cause the light flash of traffic lights, increase the useful life of traffic lights.
2, the components and parts adopted are simple, cost is lower, are applicable to promoting the use of.
Accompanying drawing explanation
Fig. 1 is the power circuit diagram of the anti-flashing of traffic lights;
Fig. 2 is input undervoltage protection circuit figure.
Embodiment
Power circuit diagram as shown in Figure 1; in dotted line frame is the single-ended flyback isolation type switch power constant-current source circuit of typical L6526SP chip controls; comprise current rectifying and wave filtering circuit, constant current output circuit, dotted line frame outside is featured circuit input undervoltage protection circuit of the present utility model.Because the single-ended flyback isolation type switch power constant-current source circuit of the L6526SP chip controls in dotted line frame is prior art; its all technical characteristic is all complete open; therefore the principle of this circuit is no longer analyzed at this; selective analysis the utility model feature, the i.e. connection of input undervoltage protection circuit and operation principle thereof.
Input undervoltage protection circuit figure as shown in Figure 2, input undervoltage protection circuit comprises input detection unit, input undervoltage protected location, the anti-fluctuation unit of input undervoltage.Wherein, input undervoltage detecting unit comprises resistance R33, R32 and R35 of being connected in series, and the resistance R33 other end is connected to the voltage input end A of input undervoltage protection circuit, is connected with the reference pole of accurate adjustable linear voltage regulator TL431 between resistance R32 and R35.Input undervoltage protected location comprises resistance R31, R36 and electric capacity C19 of being connected in series; the anode of close adjustable linear voltage regulator TL431 is connected with between resistance R36 and electric capacity C19; hinder between R36 and electric capacity C19 simultaneously and go back reverse parallel connection voltage stabilizing didoe ZD5; the voltage stabilizing value of this voltage stabilizing didoe is 5.6V, and its positive pole is connected with the base stage of NPN triode Q5.The resistance R34 that the anti-fluctuation unit of described input undervoltage comprises diode D8 and is connected with its negative pole; simultaneously; the positive pole of diode D8 is parallel between resistance R32 and R35, and resistance R34 is connected with the collector electrode of NPN triode Q5, as the output of this input undervoltage protection circuit.
During power on circuitry, when input voltage is in normal range (NR), when the voltage range namely in input power circuit is 90V-270V, Switching Power Supply normally works.Now be input to the circuit dividing potential drop sampling that in input undervoltage protection circuit, large voltage is composed in series via R33, R32, R35; make voltage on R35 higher than 2.50V; the voltage being namely added in TL431 reference pole is greater than 2.50V(note: TL431 is 2.50V with reference to the reference voltage of pole); the now negative electrode pin position conducting of TL431; anode pin position is electronegative potential, and voltage stabilizing didoe ZD5 and NPN triode Q5 is ended.The VCC voltage not affecting B point in under-voltage protecting circuit exports, meanwhile, due to R34, D8 series arm because diode D8 place reverse-biased does not affect the VCC voltage of B point equally; Therefore Switching Power Supply normally works.
When input voltage is lower than normal range (NR); namely when the voltage in input power circuit is less than 90V; now be input to the circuit dividing potential drop sampling that in input undervoltage protection circuit, large voltage is composed in series via R33, R32, R35; make voltage on R35 lower than 2.50V, be namely carried in TL431 and be less than 2.50V with reference to the voltage of pole.When the reference pole on-load voltage of TL431 is lower than reference voltage 2.50V; in high-impedance state between negative electrode, anode; now input undervoltage protection circuit voltage input source A point charges to electric capacity C19 through R31, R36; the voltage on electric capacity C19 is made constantly to increase; when the magnitude of voltage on electric capacity C19 is raised to the voltage stabilizing value 5.6V being greater than voltage stabilizing didoe ZD5; now voltage stabilizing didoe ZD5 conducting, its generation current causes NPN triode Q5 saturation conduction.By B point voltage clamper at about 0.3V, then (8) input of the constant current chip L6526SP now in constant-current circuit quits work because losing VCC voltage, makes now Switching Power Supply no-output, is namely in the too low guard mode of input voltage.
Simultaneously, series arm diode D8, R34 being formed due to the conducting of NPN triode Q5 is connected in parallel on divider resistance R35, and diode D8 place positively biased, reduce further the voltage on resistance R35, also the voltage being just carried in the reference pole of TL431 is lower, make power circuit can not produce the fluctuation of input voltage because of the critical condition being in reference voltage, cause the output that power supply cuts in and out, the input voltage when power circuit is only had to rise to normal voltage range, namely, during 90V-270V, power circuit just can recover to export.
Claims (1)
1. the anti-flashing power circuit of traffic lights, comprise current rectifying and wave filtering circuit, constant current output circuit and input undervoltage protection circuit, it is characterized in that: described input undervoltage protection circuit comprises the anti-fluctuation unit of input detection unit, input undervoltage protected location and input undervoltage;
Described input undervoltage detecting unit comprises resistance R33, R32 and R35 of being connected in series, the resistance R33 other end is connected to the voltage input end A of described input undervoltage protection circuit, is connected with the reference pole of accurate adjustable linear voltage regulator TL431 between resistance R32 and R35;
Described input undervoltage protected location comprises resistance R31, R36 and electric capacity C19 of being connected in series, the anode of close adjustable linear voltage regulator TL431 is connected with between resistance R36 and electric capacity C19, hinder between R36 and electric capacity C19 simultaneously and go back reverse parallel connection voltage stabilizing didoe ZD5, the positive pole of this voltage stabilizing didoe ZD5 is connected with the base stage of triode Q5;
The resistance R34 that the anti-fluctuation unit of described input undervoltage comprises diode D8 and is connected with its negative pole; simultaneously; the positive pole of diode D8 is parallel between resistance R32 and R35, and resistance R34 is connected with the collector electrode of triode Q5, as the output of described input undervoltage protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420471031.0U CN204090227U (en) | 2014-08-20 | 2014-08-20 | The anti-flashing power circuit of a kind of traffic lights |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420471031.0U CN204090227U (en) | 2014-08-20 | 2014-08-20 | The anti-flashing power circuit of a kind of traffic lights |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204090227U true CN204090227U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420471031.0U Active CN204090227U (en) | 2014-08-20 | 2014-08-20 | The anti-flashing power circuit of a kind of traffic lights |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106097752A (en) * | 2016-08-16 | 2016-11-09 | 安徽科力信息产业有限责任公司 | A kind of Signalized control switch protecting circuit and adaptive guard method thereof |
| CN110875687A (en) * | 2018-09-04 | 2020-03-10 | 上海航空电器有限公司 | Aviation isolation type flyback switching power supply converter |
-
2014
- 2014-08-20 CN CN201420471031.0U patent/CN204090227U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106097752A (en) * | 2016-08-16 | 2016-11-09 | 安徽科力信息产业有限责任公司 | A kind of Signalized control switch protecting circuit and adaptive guard method thereof |
| CN110875687A (en) * | 2018-09-04 | 2020-03-10 | 上海航空电器有限公司 | Aviation isolation type flyback switching power supply converter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 330100 Jiangxi Province, Nanchang City New Town Industrial District No. 408 Road, Changleng Patentee after: Nanchang Jinke traffic Polytron Technologies Inc Address before: 408 No. 330100 Jiangxi province Nanchang Changleng Foreign Investment Industrial Zone, Industrial Avenue Patentee before: Nanchang Jinke Traffic Science and Technology Co., Ltd. |