CN101437344B

CN101437344B - Constant-lighting fault protection circuit for traffic signal light

Info

Publication number: CN101437344B
Application number: CN2008102314629A
Authority: CN
Inventors: 余建华; 王彬
Original assignee: SHENGMAO PHOTOELECTRIC TECHNOLOGIES Co Ltd
Current assignee: SHENGMAO PHOTOELECTRIC TECHNOLOGIES Co Ltd
Priority date: 2008-12-22
Filing date: 2008-12-22
Publication date: 2012-05-23
Anticipated expiration: 2028-12-22
Also published as: CN101437344A

Abstract

The invention provides a traffic light normally-lighting fault protection circuit, which comprises a signaler main control circuit, red, yellow and green three groups of light state acquisition circuits, a red and green light power cut circuit and a yellow light lighting circuit, wherein the signaler main control circuit is electrically connected with the light state acquisition circuits and is used for reading signal light state information to perform fault judgment; and the red and green light power cut circuit and the yellow light lighting circuit are electrically connected to the signaler main control circuit respectively and are used for executing command of the signaler main control circuit. The fault protecting circuit is improvement on the basis of a traffic light control device, namely a signaler, has the advantages of smart and practical of circuit design, low cost and stable working performance, and can exclude traffic hidden trouble in time and effectively avoid traffic accidents to ensure traffic safety at intersections.

Description

Constant-lighting fault protection circuit for traffic signal light

Technical field

The present invention relates to a kind of traffic lights holding circuit, specifically, relate to a kind of constant-lighting fault protection circuit for traffic signal light.

Background technology

Traffic lights the normal bright fault of red light or green light can occur because of various reasons in long use; Especially in a single day the normal bright fault of unidirectional or two-way green light appears in the crossing, just is prone to conflict with mutual crisscross traffic signals, and then misleads vehicle and pedestrian, very easily causes traffic hazard.

In order to overcome the above problems, people are seeking a kind of desirable technical solution always.

Summary of the invention

The objective of the invention is deficiency to prior art; A kind of circuit design is light and practical, cost is low, the constant-lighting fault protection circuit for traffic signal light of stable work in work thereby provide; This circuit can in time be got rid of traffic hidden danger, effectively avoids traffic accident, and guarantees crossing traffic safety.

To achieve these goals, the present invention provides a kind of constant-lighting fault protection circuit for traffic signal light, and it comprises the teleseme governor circuit, red, yellow, green three groups of lamp attitude Acquisition Circuit, traffic lights power cutting circuit and amber light point brightening circuit; Wherein, said teleseme governor circuit is electrically connected said lamp attitude Acquisition Circuit, is used to read signal lamp lamp attitude information so that carry out fault judgement; Said traffic lights power cutting circuit and said amber light point brightening circuit are electrically connected said teleseme governor circuit respectively, are used to carry out the order of teleseme governor circuit;

Said lamp attitude Acquisition Circuit comprises that primary side is serially connected in the current transformer in the signal lamp loop, voltage comparator, commutation diode, reference power supply, electric capacity of voltage regulation and the resistance that output terminal connects the teleseme governor circuit; Wherein, Said Current Transformer Secondary side one end of the anodal connection of said commutation diode; Said commutation diode negative pole connects said voltage comparator inverting input and said resistance one end respectively; Said resistance other end ground connection, said resistance and said electric capacity of voltage regulation are connected in parallel, and said voltage comparator normal phase input end connects said reference power supply;

Said traffic lights power cutting circuit comprises that the first anode and second anode are serially connected in the traffic lights hex inverter that bidirectional triode thyristor, light activated power thyristor and input end in the red and green signals lamp loop is connected the teleseme governor circuit; Wherein, Said traffic lights hex inverter output terminal connects the diode cathode of said light activated power thyristor, and the output loop two ends of said light activated power thyristor connect the control end and the first anode of said bidirectional triode thyristor respectively;

Said amber light point brightening circuit comprises that the first anode and second anode are serially connected in the amber light bidirectional triode thyristor in the amber light loop, the amber light light activated power thyristor is connected the teleseme governor circuit with input end amber light hex inverter; Wherein, Said amber light hex inverter output terminal connects the diode cathode of said amber light light activated power thyristor, and the output loop two ends of said amber light light activated power thyristor connect the control end and the first anode of said amber light bidirectional triode thyristor respectively.

The relative prior art of the present invention has outstanding substantive distinguishing features and obvious improvement; Specifically; This circuit is on the basis of traffic signals lamp control device teleseme, to improve, and has that circuit design is light and practical, cost is low, the advantage of stable work in work, and it can in time get rid of traffic hidden danger; Effectively avoid traffic accident, guarantee crossing traffic safety;

Certain green light at traffic lights causes Chang Lianghou owing to fault; Collect the normal bright signal of this lamp and pass to the teleseme governor circuit by lamp attitude Acquisition Circuit; The teleseme governor circuit misleads vehicle and pedestrian for avoiding crisscross giving a green light simultaneously, and the teleseme governor circuit passes through the dump of trouble light traffic lights power cutting circuit with traffic lights, and through amber light point brightening circuit amber light is lighted; Carry out Huang and dodge, keep in repair waiting.

Description of drawings

Fig. 1 is a circuit structure block diagram of the present invention;

Fig. 2 is a circuit diagram of the present invention.

Embodiment

Through embodiment, technical scheme of the present invention is done further detailed description below.

As shown in Figure 1, a kind of constant-lighting fault protection circuit for traffic signal light comprises the teleseme governor circuit, is respectively applied for the lamp attitude Acquisition Circuit of redness, yellow, greensignal light, traffic lights power cutting circuit and amber light point brightening circuit; Wherein, said teleseme governor circuit is electrically connected said lamp attitude Acquisition Circuit, is used to read signal lamp lamp attitude information so that carry out fault judgement; Said traffic lights power cutting circuit and said amber light point brightening circuit are electrically connected said teleseme governor circuit respectively, are used to carry out the order of teleseme governor circuit.

Concrete working method is: the state of each signal lamp of lamp attitude Acquisition Circuit collection also sends the teleseme governor circuit to; The teleseme governor circuit judges that to all lamp attitudes if certain red light or green light Chang Liang, the teleseme governor circuit sends the signal of cutting off the electricity supply to the traffic lights power cutting circuit immediately; The traffic lights power cutting circuit is with the dump of traffic lights; Simultaneously, the teleseme governor circuit sends amber light point brightening circuit and lights signal, and amber light is lighted.

Said teleseme governor circuit is the governor circuit that utilizes existing teleseme, and realizes each circuit control through the control to address and data bus; It includes a PC104 industrial control board, through PC104 bus output data address bus and reading writing signal line.

The principle of said lamp attitude Acquisition Circuit is that traffic lights has alternating current when lighting and passes through, and is little electric current through a current transformer with big current conversion, has judged whether that through a comparer electric current passes through;

When certain lamp is bright, must have electric current flows through; The current transformer that in the loop of signal lamp, adds a 5A/5mA; Can sample the little electric current of signal lamp loop current 1/1000 like this, send into voltage comparator LM2902 through diode 1N4148 rectification and electric capacity of voltage regulation voltage stabilizing then, the 0.04V reference voltage that obtains with the electric resistance partial pressure of 62K and 510 Ω compares; If be higher than reference voltage; It is bright state through traffic lights that there is electric current in voltage comparator LM2902 output low level explanation loop, if be lower than reference voltage, LM2902 output high level explanation traffic lights is going out; PC104 on the governor circuit is through PC104 bus OPADD 0X000 and read signal N-CPU-IOR; Address wire is through the sheet choosing of decoding gating U21 eight line buffers of the 3 lines-8 line code translator of U18 and U20; The level signal of LM2902 output is outputed on the data bus D0-D8 through U21; PC104 reads back the data on the bus through eight bidirectional bus transceiver 74HC245 then, through software data is handled then.

Said traffic lights power cutting circuit comprises that the first anode and second anode are serially connected in the traffic lights hex inverter that bidirectional triode thyristor, light activated power thyristor and input end in the red and green signals lamp loop is connected the teleseme governor circuit; Wherein, Said traffic lights hex inverter output terminal connects the diode cathode of said light activated power thyristor, and the output loop two ends of said light activated power thyristor connect the control end and the first anode of said bidirectional triode thyristor respectively; When evergreen fault appearred in the signal lamp on certain direction, the PC104 on the teleseme master control borad had received the light on and off situation of the real-time lamp of lamp attitude Acquisition Circuit feedback through address and data bus, after the teleseme program finds that green conflict appears in signal lamp; Traffic light signal is cut off in teleseme output, passes through PC104 bus OPADD 0X010 and write signal N-CPU-IOW through the PC104 bus, and through data bus output 0X40; Address wire is through the latch signal line of a level control of U18 decoding choosing output U23, and U2374HC373 is a latch, when LE is low level; Chip can be with the data latching on the bus; The signal N-CONFLICT that cut off the traffic lights power supply this moment imports CPLD into, and CPLD judges through logical circuit, the signal POWERC output low level of will cutting off the electricity supply; Through becoming high level after the hex inverter 74HC05 anti-phase; Light activated power thyristor MOC3063 ends, not conducting of bidirectional triode thyristor BTA26, thus realized the cut-out of traffic lights power supplys;

Said amber light point brightening circuit comprises that the first anode and second anode are serially connected in the amber light bidirectional triode thyristor in the amber light loop, the amber light light activated power thyristor is connected the teleseme governor circuit with input end amber light hex inverter; Wherein, Said amber light hex inverter output terminal connects the diode cathode of said amber light light activated power thyristor, and the output loop two ends of said amber light light activated power thyristor connect the control end and the first anode of said amber light bidirectional triode thyristor respectively; PC104 on the teleseme master control borad is through PC104 bus OPADD 0X008 and write signal N-CPU-IOW; And through data bus output 0XFD; Decipher through after the phase inverter 74HC04 anti-phase through U18 and U26 the address, and the LE end of control U25 latch 74HC373 latchs output with 0XFD; The break-make that realizes MOC3063 is brought in the control that inserts light activated power thyristor MOC3063 through the reverse back of 74HC05 then, and then control bidirectional triode thyristor BTA16 realizes the control to signal lamp.

Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims

1. a constant-lighting fault protection circuit for traffic signal light comprises the teleseme governor circuit, it is characterized in that: this holding circuit also comprises redness, yellow, green three groups of lamp attitude Acquisition Circuit, traffic lights power cutting circuit and amber light point brightening circuit; Wherein, said teleseme governor circuit is electrically connected said lamp attitude Acquisition Circuit, is used to read signal lamp lamp attitude information so that carry out fault judgement; Said traffic lights power cutting circuit and said amber light point brightening circuit are electrically connected said teleseme governor circuit respectively, are used to carry out the order of teleseme governor circuit;