CN114590286B - Safety annunciator and control method thereof - Google Patents
Safety annunciator and control method thereof Download PDFInfo
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- CN114590286B CN114590286B CN202210073817.6A CN202210073817A CN114590286B CN 114590286 B CN114590286 B CN 114590286B CN 202210073817 A CN202210073817 A CN 202210073817A CN 114590286 B CN114590286 B CN 114590286B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention belongs to the technical field of rail transit, and particularly relates to a safety annunciator and a control method thereof, wherein the safety annunciator comprises a safety driving unit, a safety control unit and an acquisition unit; the input end of the safety driving unit is connected with the power input end and is used for providing electric energy for the annunciator; the output end of the safety driving unit is respectively connected with the input ends of the safety control unit and the acquisition unit; the input end of the safety control unit is also connected with the output end of the acquisition unit, and the output end of the safety control unit is connected with the safety driving unit. The safety annunciator solves the problem that the existing LED annunciator is incompatible with the traditional color lamp annunciator; the safety annunciator is subjected to hardware design and software control according to a reactive 'failure-safety' principle, so that when any single point failure exists, the annunciator basically has no output, and the indoor lighting relay is changed from suction to falling.
Description
Technical Field
The invention belongs to the technical field of rail transit, and particularly relates to a safety signal machine and a control method thereof.
Background
With rapid development of the rail transit industry and continuous innovation of various technologies, the rail transit signal products are required to improve the automation and intelligence degree of equipment by using modern electronic technology, communication technology and the like on the basis of guaranteeing the existing functions, and the safety and reliability of the products are guaranteed. The signal lamp is used as a baton in a rail transit control system and is a key device for guaranteeing driving safety. Along with the improvement of train speed and driving efficiency, the requirements of the safety and reliability of the rail traffic signal are becoming strict. Most of the existing rail traffic annunciators adopt traditional colored light annunciators, have the problems of low efficiency, short service life, frequent maintenance and the like, and are gradually not suitable for the requirements of railway signal display. Compared with the traditional color lamp, the LED light source has many improvements, and the LED light source is safe, low in heating value, energy-saving and environment-friendly, long in service life of the LED and capable of reducing maintenance frequency and difficulty of the annunciator. LED annunciators using LEDs as light sources are favored because of the excellent characteristics of LED light sources. However, due to the difference of the LED principle and the bulb lighting principle, the drive circuit, the lighting unit and the filament relay are incompatible in inspection, the replacement difficulty is high, and the safety and the reliability of the existing LED annunciator are required to be improved due to the fact that the LED fault mode is complex, so that the LED annunciator is low in utilization rate on a common speed and high-speed railway and only has a small amount of application on local railways and subway lines.
Disclosure of Invention
In view of the foregoing, in one aspect, the present invention discloses a safety annunciator, which includes: the safety driving unit, the safety control unit and the acquisition unit;
the input end of the safety driving unit is connected with the power input end and is used for providing electric energy for the annunciator; the output end of the safety driving unit is respectively connected with the input ends of the safety control unit and the acquisition unit;
the input end of the safety control unit is also connected with the output end of the acquisition unit, and the output end of the safety control unit is connected with the safety driving unit.
Further, the safety driving unit comprises a relay control circuit, an LED rectifying circuit, a power control circuit and a weak current power supply circuit;
the input end of the relay control circuit is connected with the power input end, and the output end of the relay control circuit is connected with the input end of the LED rectifying circuit;
the output end of the LED rectifying circuit is connected with the input end of the power control circuit;
the voltage dividing branch of the power control circuit is connected with the input end of the weak current power supply circuit, and the output end of the weak current power supply circuit is connected with the input end of the power control circuit.
Further, the safety drive unit further comprises an ingress protection circuit;
the entrance protection circuit is connected in series between the power input end and the relay control circuit.
Further, the security control unit comprises a CPU1 and a CPU2;
the input ends of the CPU1 and the CPU2 are respectively connected with the output end of the weak current power supply circuit;
the output ends of the CPU1 and the CPU2 are respectively connected with the input end of the power control circuit;
the output ends of the CPU1 and the CPU2 are also respectively connected with the input end of the relay control circuit.
Further, the acquisition unit comprises a self-adaptive monitoring acquisition circuit, a first voltage and current acquisition circuit and a second voltage and current acquisition circuit;
the output end of the self-adaptive monitoring acquisition circuit is connected with the input ends of the CPU1 and the CPU2, and the self-adaptive monitoring acquisition circuit is used for acquiring the environmental temperature data, the environmental humidity data and the light intensity data of the safety annunciator and sending the environmental temperature data, the environmental humidity data and the light intensity data to the CPU1 and the CPU2 for analysis;
the output end of the first voltage and current acquisition circuit is connected with the input end of the CPU1, and the first voltage and current acquisition circuit is used for acquiring a driving voltage signal, a driving current signal, an input voltage signal and an output voltage signal of the safety control unit and transmitting the driving voltage signal, the driving current signal, the input voltage signal and the output voltage signal to the CPU1 for analysis;
the output end of the second voltage and current acquisition circuit is connected with the input end of the CPU2, and the second voltage and current acquisition circuit is used for acquiring a driving voltage signal, a driving current signal, an input voltage signal and an output voltage signal of the safety control unit and transmitting the driving voltage signal, the driving current signal, the input voltage signal and the output voltage signal to the CPU2 for analysis.
Further, the relay control circuit comprises an optocoupler, a first rectifier bridge, a current transformer and a safety relay;
the input end of the optocoupler is connected with the output ends of the CPU1 and the CPU2, the output end of the optocoupler is connected with the secondary side of the current transformer, and a first rectifier bridge is connected in parallel between the output end of the optocoupler and the secondary side of the current transformer;
the input end of the safety relay is connected in parallel with the output end of the optical coupler and the secondary side of the current transformer, the input end of the safety relay is also connected with the output end of the entrance protection circuit, and the output end of the safety relay is sequentially connected with the primary side of the current transformer and the input end of the LED rectifying circuit in series;
and a capacitor is connected in parallel between the output end of the optical coupler and the secondary side of the current transformer.
Further, the LED rectifying circuit comprises two groups of second rectifying bridge arms connected in parallel, and each group of second rectifying bridge arms comprises a diode;
the second rectifier bridge arms further comprise one or more LED lamp beads connected in series, and the diodes on each second rectifier bridge arm and the LED lamp beads are connected in series.
Further, the output end of the LED rectifying circuit is connected with the input end of the power control circuit, and the power control circuit comprises a load resistor R1, a load resistor R3 and a load resistor R2 which are connected in series;
the power control circuit further comprises an electronic switch P1 and an electronic switch P2, wherein the electronic switch P1 is connected with the load resistor R1 in parallel, the electronic switch P2 is connected with the load resistor R2 in parallel, and control ends of the electronic switch P1 and the electronic switch P2 are respectively connected with output ends of the CPU1 and the CPU2;
and the load resistor R3 and the load resistor R2 are connected in series and then connected with the weak current power supply circuit in parallel.
Still further, the weak current power supply circuit comprises a power supply conversion module;
the input end of the power conversion module is connected in parallel with the load resistor R3 and the load resistor R2 which are connected in series;
the output end of the power supply conversion module is connected with the safety control unit and is used for supplying direct current to the safety control unit;
the output end of the power conversion module is also connected with the driving chips of the electronic switch P1 and the electronic switch P2 and is used for supplying direct current to the driving chips;
a fuse and an anti-reflection diode D1 are also connected in series between one input end of the power conversion module and the load resistor R3;
an anti-reflection diode D2 is connected in series between the other input end of the power conversion module and the load resistor R2.
In another aspect, the invention also discloses a control method of the safety annunciator, wherein the control method of the annunciator comprises software control and hardware control;
the software control includes: the acquisition unit acquires circuit safety data of the safety driving unit and sends the circuit safety data to the safety control unit for analysis, and the safety control unit sends a feedback signal to the safety driving unit according to the circuit safety data, wherein the feedback signal comprises a relay control signal and a PWM control signal;
the hardware control includes: the safety driving unit extracts current data passing through the safety driving unit, and the safety driving unit is controlled to be turned on or turned off according to the current data.
Further, the step of the collecting unit collecting the circuit safety data of the safety driving unit and transmitting the circuit safety data to the safety control unit specifically includes:
the self-adaptive monitoring acquisition circuit acquires the environmental temperature data, the environmental humidity data and the light intensity data of the safety annunciator, and the first voltage and current acquisition circuit and the second voltage and current acquisition circuit acquire the input voltage of the relay control circuit, the output voltage of the power control circuit and the driving voltage and the driving current of the LED rectifying circuit;
the self-adaptive monitoring acquisition circuit respectively sends acquired data to the CPU1 and the CPU2 for analysis, and the first voltage and current acquisition circuit and the second voltage and current acquisition circuit respectively send the acquired data to the CPU1 and the CPU2 for analysis.
Further, the step of the safety control unit sending a feedback signal to the safety driving unit according to the circuit safety data specifically includes:
the CPU1 and the CPU2 send relay control signals to the relay control circuit according to the analysis result, when the analysis result is abnormal, the relay control circuit is disconnected, and when the analysis result is normal, the relay control circuit is connected;
the CPU1 and the CPU2 send PWM control signals to the power control circuit according to analysis results, when the analysis results are abnormal, the electronic switch P1 and the electronic switch P2 are disconnected, the power control circuit cuts off input, when the analysis results are normal, the CPU1 and the CPU2 adjust the duty ratios of the electronic switch P1 and the electronic switch P2, and the safety annunciator is normally lightened.
Still further, the step of controlling the safety driving unit to be turned on or off according to the current data by the safety driving unit comprises the following steps:
collecting current data of a relay control circuit through a current transformer, comparing the current data with a current threshold of a safety relay, and closing the safety relay if the current data meets the current threshold, wherein the relay control circuit works normally;
if the current data does not meet the current threshold value, the safety relay is disconnected, and the relay control circuit cannot work normally;
the current threshold is a current range of normal operation of the safety relay circuit.
The invention provides a safety annunciator, which is designed according to the use structure and the broken wire condition of a traditional color lamp annunciator, solves the problem that the traditional LED annunciator is incompatible with the traditional color lamp annunciator, and realizes the in-situ replacement from the traditional color lamp annunciator on the existing line to the safety annunciator; the safety annunciator is based on the existing power electronic technology, a safety control part with a two-to-two structure is designed according to a combined type 'failure-safety' principle to carry out software control, when two-to-two is consistent, the safety annunciator is output through software control, and hardware design and software control are carried out according to a reactive type 'failure-safety' principle, so that when any single point failure exists, the annunciator is basically not output, and an indoor lighting relay is changed from suction to falling.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic structural diagram of a security signal in accordance with an embodiment of the invention;
fig. 2 shows a schematic diagram of the structure of a relay control circuit and an LED rectifying circuit according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of the structure of a power control circuit and a weak current supply circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a safety annunciator, which is an innovative improvement made according to the existing LED annunciator, solves the problem that the LED annunciator in the prior art is incompatible with the traditional color lamp annunciator, improves the safety and reliability of the existing LED annunciator, and promotes the wide use of the LED annunciator on common speed and high-speed railway lines.
As shown in fig. 1, the safety signal machine is a structural block diagram, wherein the safety control unit adopts a two-in-two structure, the CPU1 and the CPU2 respectively collect and analyze and compare the collection points of the safety driving unit of the safety signal machine to form a circuit self-test, when the CPU1 and the CPU2 judge that the safety driving unit is normal, the CPU1 and the CPU2 normally output, when the CPU1 and the CPU2 judge that the safety driving unit is abnormal, the CPU1 and the CPU2 send PWM control signals to a power control circuit so that the electronic switch P1 and the electronic switch P2 are disconnected, a large resistance load is formed in the power control circuit so as to reduce the input current in the circuit, and meanwhile, the CPU1 and the CPU2 send relay control signals to the relay control circuit to control the disconnection of the safety relay and cut off the power supply input; and double measures are taken to ensure the safe output of the circuit. After the safety driving unit of the safety signal machine is reduced in voltage by the lightning protection transformer of the entrance protection circuit, the on-off of the whole circuit is controlled by the normally closed node safety relay cooperatively controlled by software and hardware, and when the input current is abnormal or the closed loop self-checking abnormality is judged by the feedback safety control unit of the acquisition unit, the output of the safety relay is cut off; the LED lamp beads or the LED lamp string combination is adopted as a first rectifier bridge, and the LEDs are used for rectifying and outputting during normal operation, so that information such as voltage, current and frequency on a bus is collected in real time to judge whether the circuit and the first rectifier bridge are abnormal; the bus is a main circuit where a power input end is located, the power control circuit is adopted to serve as a whole circuit load, the circuit load size can be adjusted according to control of the electronic switch P1 and the electronic switch P2, the CPU1 and the CPU2 enable the load to be small through safety and logic when a normal lamp is on, and a large-resistance load is formed when the lamp is off; the weak current power supply circuit is used as a parallel branch of the load circuit and supplies power for the power control circuit and the safety control unit.
Referring to fig. 1, the safety signal machine is mainly divided into three parts, namely a safety control unit, an acquisition unit and a safety driving unit. The safety control unit adopts a completely independent two-out-of-two structure to realize the safety control of the safety driving unit of the safety annunciator. The safety driving unit of the safety annunciator is divided into an entrance protection circuit, a relay control circuit, an LED rectifying circuit, a power control circuit and a weak current power supply circuit; the safety driving unit, the acquisition unit and the safety control unit are mutually isolated.
The safety control unit adopts a standard two-out-of-two structure according to a fault-safety principle, wherein the safety control A of the safety control unit comprises a CPU1, the safety control B comprises a CPU2, the CPU1 and the CPU2 are mutually isolated and independent, each CPU respectively acquires acquisition values such as input voltage, output voltage, driving current and the like through a first voltage and current acquisition circuit and a second voltage and current acquisition circuit in the acquisition unit and performs analysis and calculation to form a circuit self-check, when a certain CPU fails to perform two-out-of-order or the acquisition value exceeds a threshold value, namely, the circuit self-check is abnormal, the CPU1 and the CPU2 cut off the output of the relay, the safety relay is disconnected, the power input is cut off, the CPU1 and the CPU2 are disconnected through a PWM output control electronic switch, the power control circuit forms a load large resistor, the primary side current of the transformer is smaller than 2ma, the indoor relay drops, the double protection of cut-off input and load increase is realized, the output of a lamp is extinguished when the circuit is abnormal, and the safety driving of the safety signal machine is completed; and if and only if the two CPU 'takes two' are consistent and the self-checking circuit is judged to be normal, an output driving instruction is formed, the relay is controlled to be closed by opening the relay, the PWM control signal is sent to control the electronic switch P1 and the electronic switch P2 to be closed, and the normal driving of the safety annunciator is completed.
The input voltage of the entrance protection circuit is 220V alternating current, and the input voltage performs lightning protection and voltage conversion through the existing lightning protection transformer to provide power for the safety signal machine.
The acquisition unit comprises a voltage and current acquisition unit and a self-adaptive monitoring acquisition circuit. The voltage and current acquisition unit comprises a first voltage and current acquisition circuit and a second voltage and current acquisition circuit which are heterogeneous, the first voltage and current acquisition circuit and the second voltage and current acquisition circuit are mutually independent, heterogeneous acquisition is realized by adopting heterogeneous AD acquisition chips, and judgment errors of a safety control part are prevented from being caused by single-point faults. The first voltage and current acquisition circuit and the second voltage and current acquisition circuit are used for carrying out parallel acquisition on the input voltage of the relay control circuit, the output voltage of the power control circuit and the driving voltage and driving current of the LED rectifying circuit, are respectively connected with the CPU1 and the CPU2 of the safety control unit II, and realize real-time acquisition monitoring and circuit self-checking of the state of the safety signal machine by acquiring the state of the information analysis circuit. Presetting an acquisition information threshold, and judging that a circuit is normal by a CPU1 and a CPU2 when acquisition information (input voltage of a relay control circuit, output voltage of a power control circuit, driving voltage and driving current of an LED rectifying circuit) is in a threshold range, and normally driving and outputting the CPU1 and the CPU2; when the acquired information exceeds the threshold range, the CPU1 and the CPU2 judge that the circuit is abnormal, and the CPU1 and the CPU2 cut off the control output of the safety relay and control the electronic switch P1 and the electronic switch P2 to be disconnected.
The self-adaptive monitoring acquisition circuit comprises temperature, humidity and light intensity acquisition, and is used for realizing the acquisition of the ambient temperature and the humidity and sending the results to the CPU1 and the CPU2;
when the CPU1 and the CPU2 detect that the ambient temperature and the humidity are in the rated value range, the CPU1 and the CPU2 are normally driven;
when the CPU1 and the CPU2 detect that the ambient temperature and the humidity are within the range of +/-10% of the rated value, the CPU1 and the CPU2 carry out ambient temperature and humidity alarm, and the CPU1 and the CPU2 are normally driven; when the CPU detects that the ambient temperature and the humidity exceed the rated value plus or minus 10 percent and are within the range of plus or minus 30 percent, the CPU1 and the CPU2 judge that the environment is abnormal, the output of the safety relay is cut off, the electronic switch P1 and the electronic switch P2 are controlled to be disconnected, and the environment self-adaptive output of the safety annunciator is realized. The safety annunciator collects the light intensity of the safety annunciator while safely outputting and judges the failure rate of the light source of the safety annunciator. When the failure rate of the LED light source is lower than 30%, the safety annunciator is normally lightened; when the failure rate of the LED light source exceeds 30% and is lower than 70%, the CPU1 and the CPU2 adjust the duty ratio of the electronic switch P1 and the electronic switch P2, the safety annunciator is normally lightened, and the CPU1 and the CPU2 send out abnormal alarm information; when the failure rate of the LED light source exceeds 70%, the CPU1 and the CPU2 cut off the output of the relay, control the electronic switch P1 and the electronic switch P2 to be disconnected, and realize the brightness self-adaptive output of the safety annunciator.
As shown in fig. 2, a first node 1 at one side of an input end of the optocoupler is connected with the CPU1 and the CPU2, the other side of the input end of the optocoupler is grounded, a second node 2 and a third node 3 are arranged at an output end of the optocoupler, and the second node 2 and the third node 3 are respectively connected with a secondary side of the current transformer.
As shown in fig. 2, as one embodiment of the present invention, the safety relay is provided with a node 1, a node 2, a node 3, a node 4, a node 5, a node 6, a node 7 and a node 8, wherein the safety relay is arranged on the node 2 and the node 3 of the output end of the optocoupler in parallel through the node 1 and the node 2, the node 3 of the safety relay is connected with the primary side of the current transformer, the node 4 is connected with the LED rectifying circuit, when the node 3 is LED to the node 5 and the node 4 is LED to the node 6, the safety relay is in a normally closed state, and when the node 3 is LED to the node 7 and the node 4 is LED to the node 8, the safety relay is in a normally open state.
As shown in fig. 2, the LED rectifying circuit includes two groups of second rectifying bridge arms connected in parallel, each group of second rectifying bridge arms includes two diodes and a plurality of LED beads connected in series, each group of diodes and LED beads are connected in series, a primary side of the current transformer is connected between two diodes of one of the two groups of second rectifying bridge arms, and a node 4 of the safety relay is connected between two diodes of the other group.
The relay control circuit adopts two groups of node guarantee circuits of the safety relay to realize the double-break function, thereby guaranteeing the safety output of the safety annunciator. The relay control circuit can realize the hardware and software dual control of the safety relay.
The software control includes: the acquisition unit acquires circuit safety data of the safety driving unit and sends the circuit safety data to the safety control unit for analysis, and the safety control unit sends a feedback signal to the safety driving unit according to the circuit safety data, wherein the feedback signal comprises a relay control signal and a PWM control signal; specifically, the method comprises the following steps:
the self-adaptive monitoring acquisition circuit acquires the environmental temperature data, the environmental humidity data and the light intensity data of the safety annunciator, and the first voltage and current acquisition circuit and the second voltage and current acquisition circuit acquire the input voltage of the relay control circuit, the output voltage of the power control circuit and the driving voltage and the driving current of the LED rectifying circuit;
the self-adaptive monitoring acquisition circuit respectively sends acquired data to the CPU1 and the CPU2 for analysis, and the first voltage and current acquisition circuit and the second voltage and current acquisition circuit respectively send the acquired data to the CPU1 and the CPU2 for analysis;
the CPU1 and the CPU2 send relay control signals to the relay control circuit according to the analysis result, when the analysis result is abnormal, the relay control circuit is disconnected, and when the analysis result is normal, the relay control circuit is connected.
The hardware control includes: and the safety driving unit extracts and analyzes the current data passing through the safety driving unit, and controls the safety driving unit to be switched on or switched off according to the analysis result of the current data. Specifically, the method comprises the following steps:
collecting current data of a relay control circuit through a current transformer, comparing the current data with a current threshold of a safety relay, and closing the safety relay if the current data meets the current threshold, wherein the relay control circuit works normally;
if the current data does not meet the current threshold value, the safety relay is disconnected, and the relay control circuit cannot work normally;
the current threshold is a current range of normal operation of the safety relay circuit.
Specifically, the hardware control includes: when the current transformer collects the input current within the normal range of the working current of the safety relay, the node 3 of the safety relay is connected with the node 5, and the node 4 is connected with the node 6, so that the conduction of a main loop of the safety driving unit is ensured, and the input voltage is normally input; when the current transformer collects the input current out of the working current range of the safety relay (namely, the circuit is abnormal), the node 3 of the safety relay is led to the node 7, and the node 4 is led to the node 8, namely, the safety relay is disconnected, so that the main loop input of the safety driving unit is cut off.
The software control comprises: when the CPU1 and/or the CPU2 self-checks and judges that the circuit is abnormal by collecting information, the CPU1 or the CPU2 sends a relay control signal to the relay control circuit, so that the input end node 1 of the optocoupler has no voltage, and the output of the optocoupler is disconnected, namely the output of the safety relay is cut off. The CPU1 and the CPU2 adopt logic or principle, namely, when any CPU is abnormal, the safety relay can be disconnected. The relay control circuit realizes double control of the safety relay through hardware and software, the double control mode is more flexible and convenient, the fault response time when the circuit is abnormal is reduced, the fault response rate is improved, and the safe and reliable output of the safety annunciator is ensured.
As shown in fig. 2, the LED rectifying circuit rectifies the alternating current passing through the safety relay control circuit, divides the LED lamp beads into two groups of two bridge arms serving as the second rectifying bridge, and the LED serves as load output and has a current trimming function. When the safety signal machine is normally lightened, the two groups of LED lamp beads work in a time-sharing mode and are alternately conducted according to fixed frequency, so that the working time of the safety signal machine is reduced by half, the service life of the safety signal machine is further prolonged, the power consumption is reduced, and the temperature rise is reduced.
As shown in fig. 3, the power control circuit is a load of the LED rectifying circuit, and the load circuit is controlled by a driving chip of the electronic switch. The power control circuit connects the electronic switch P1 and the electronic switch P2 in parallel with the load resistor R1 and the load resistor R2 respectively, and controls the electronic switch P1 and the electronic switch P2 to realize the adjustment of the load resistor R1 and the load resistor R2 through the output of the CPU1 and the CPU2, thereby finally realizing the control of the safety annunciator during normal and abnormal states. The CPU1 and the CPU2 send PWM control signals to the power control circuit according to analysis results, when the acquired information judging circuit, the ambient temperature, the ambient humidity and the LED light source are normal, the CPU1 and the CPU2 adjust the duty ratio of the electronic switch P1 and the electronic switch P2, the load resistance is reduced, and the safety signal machine is normally lightened; when the collected information judging circuit is abnormal, including abnormal ambient temperature, abnormal humidity or abnormal LED light source, the double CPU controls the electronic switch to be turned off, the load resistance is increased, the input current is reduced, the current of the primary side of the lightning protection transformer in the entrance protection circuit is limited below 2ma, the indoor H16 and H18 relays fall down, and the input is cut off. The power control circuit realizes load control through the electronic switch P1 and the electronic switch P2, and further realizes input current control; the current of the primary side of the lightning protection transformer can be limited below 2ma in abnormal conditions, reliable falling of the indoor H16 and H18 relays is realized, the lightning protection transformer is compatible with the original color lamp control system, and only the outdoor lighting unit is required to be replaced.
The H16 and H18 relays are relays connected in series in the input of the traditional color lamp annunciator, and when the input current of the traditional color lamp annunciator is smaller than a certain value, the filament is judged to be broken, and the H16 and H18 relays are disconnected at the moment. The input current of the safety annunciator is the primary side current of the lightning protection transformer, when the primary side current of the lightning protection transformer is smaller than a certain value, the filament is judged to be broken, and the H16 and H18 relays are disconnected at the moment, so that compatibility with the original color lamp control system can be realized.
As shown in fig. 3, the invention realizes the control of the whole circuit by connecting the weak current power supply circuit in parallel to one branch of the load circuit in the power control circuit, connecting the fuse and the anti-reverse diode, providing stable voltage through the power supply conversion module, and providing weak current power supply for the power control circuit and the safety control unit. The weak current power supply circuit realizes the association output of the weak current power supply voltage and the front-stage circuit, and the weak current power supply voltage can be stably output when the front-stage circuit is normal; when the abnormal conditions such as undervoltage or overvoltage occur in the front-stage circuit, weak current voltage is output abnormally, the electronic switch P1 and the electronic switch P2 in the power control circuit are disconnected, the circuit load circuit is enlarged, the indoor relay falls down, and the safety output of the safety annunciator is ensured.
The safety annunciator is designed according to the use structure and the wire breakage condition of the traditional color lamp annunciator, and the load of a circuit is controlled through an electronic switch, so that the input current is controlled, the problem that the traditional LED annunciator is incompatible with the traditional color lamp is solved, and the replacement of the traditional color lamp annunciator on the traditional line to the safety annunciator can be realized; the safety annunciator is designed based on the LED luminous principle to realize the output of the safety annunciator, LED lamp beads/lamp strings are grouped into two bridge arms serving as a second rectifier bridge, LEDs are used as load output and have a voltage arrangement function, the LEDs are alternately conducted, the power consumption of the annunciator is reduced, the temperature rise is reduced, the service life of the annunciator is prolonged, and the maintenance frequency and the maintenance difficulty of stations such as remote stations or unattended stations are reduced; the safety annunciator is based on the existing electronic technology, a safety control part of a two-to-two structure is designed according to a combined type 'fault-safety' principle to carry out software control, and when two-to-two is consistent, the annunciator is controlled to output through software, so that the safety output of the annunciator is ensured when any single point fault exists; the safety signal machine adopts a mode of connecting the two nodes of the safety relay in parallel, so that the abnormal condition of output closing caused by the adhesion of a single node is prevented, and the normal abnormal cutting-off function is ensured; the safety signal machine controls the safety relay in a software and hardware dual control mode, the control mode is flexible and convenient, the fault response time when the circuit is abnormal is reduced, and the fault response rate is improved; the safety annunciator is simultaneously turned off through the electronic switch and the physical switch when the circuit self-checking is abnormal, the annunciator output is ensured to be turned off, the safety reliability of the circuit is improved, the safety annunciator controls the circuit load through the electronic switch, the control of input current is realized, the current of the primary side of the lightning protection transformer can be limited below 2ma when the circuit self-checking is abnormal, the reliable dropping of the indoor H16 and H18 relays is realized, and the safety annunciator is compatible with the original color lamp control system, and only the outdoor lighting unit is required to be replaced.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A safety annunciator, the annunciator comprising: the safety driving unit, the safety control unit and the acquisition unit;
the input end of the safety driving unit is connected with the power input end and is used for providing electric energy for the annunciator; the output end of the safety driving unit is respectively connected with the input ends of the safety control unit and the acquisition unit;
the input end of the safety control unit is also connected with the output end of the acquisition unit, and the output end of the safety control unit is connected with the safety driving unit;
the safety control unit comprises a CPU1 and a CPU2, and the safety driving unit comprises a relay control circuit and an entrance protection circuit;
the output ends of the CPU1 and the CPU2 are respectively connected with the input end of the relay control circuit;
the entrance protection circuit is connected in series between the power input end and the relay control circuit;
the relay control circuit comprises an optical coupler, a first rectifier bridge, a current transformer and a safety relay;
the input end of the optocoupler is connected with the output ends of the CPU1 and the CPU2, the output end of the optocoupler is connected with the secondary side of the current transformer, and a first rectifier bridge is connected in parallel between the output end of the optocoupler and the secondary side of the current transformer;
the input end of the safety relay is connected in parallel with the output end of the optical coupler and the secondary side of the current transformer, the input end of the safety relay is also connected with the output end of the entrance protection circuit, and the output end of the safety relay is sequentially connected with the primary side of the current transformer and the input end of the LED rectifying circuit in series;
and a capacitor is connected in parallel between the output end of the optical coupler and the secondary side of the current transformer.
2. The safety signal according to claim 1, wherein the safety drive unit further comprises an LED rectifying circuit, a power control circuit, and a weak current supply circuit;
the input end of the relay control circuit is connected with the power input end, and the output end of the relay control circuit is connected with the input end of the LED rectifying circuit;
the output end of the LED rectifying circuit is connected with the input end of the power control circuit;
the voltage dividing branch of the power control circuit is connected with the input end of the weak current power supply circuit, and the output end of the weak current power supply circuit is connected with the input end of the power control circuit.
3. The safety signal according to claim 2, wherein,
the input ends of the CPU1 and the CPU2 are respectively connected with the output end of the weak current power supply circuit;
the output ends of the CPU1 and the CPU2 are respectively connected with the input end of the power control circuit.
4. The safety signal according to claim 3, wherein the acquisition unit further comprises an adaptive monitoring acquisition circuit, a first voltage current acquisition circuit, and a second voltage current acquisition circuit;
the output end of the self-adaptive monitoring acquisition circuit is connected with the input ends of the CPU1 and the CPU2, and the self-adaptive monitoring acquisition circuit is used for acquiring the environmental temperature data, the environmental humidity data and the light intensity data of the safety annunciator and sending the environmental temperature data, the environmental humidity data and the light intensity data to the CPU1 and the CPU2 for analysis;
the output end of the first voltage and current acquisition circuit is connected with the input end of the CPU1, and the first voltage and current acquisition circuit is used for acquiring a driving voltage signal, a driving current signal, an input voltage signal and an output voltage signal of the safety control unit and transmitting the driving voltage signal, the driving current signal, the input voltage signal and the output voltage signal to the CPU1 for analysis;
the output end of the second voltage and current acquisition circuit is connected with the input end of the CPU2, and the second voltage and current acquisition circuit is used for acquiring a driving voltage signal, a driving current signal, an input voltage signal and an output voltage signal of the safety control unit and transmitting the driving voltage signal, the driving current signal, the input voltage signal and the output voltage signal to the CPU2 for analysis.
5. A safety signal according to claim 2 or 3, wherein the LED rectifying circuit comprises two sets of parallel connected second rectifying bridge legs, and each set of second rectifying bridge legs comprises a diode;
the second rectifier bridge arms further comprise one or more LED lamp beads connected in series, and the diodes on each second rectifier bridge arm and the LED lamp beads are connected in series.
6. The safety signal according to claim 3, wherein the output end of the LED rectifying circuit is connected with the input end of the power control circuit, and the power control circuit comprises a load resistor R1, a load resistor R3 and a load resistor R2 which are connected in series;
the power control circuit further comprises an electronic switch P1 and an electronic switch P2, wherein the electronic switch P1 is connected with the load resistor R1 in parallel, the electronic switch P2 is connected with the load resistor R2 in parallel, and control ends of the electronic switch P1 and the electronic switch P2 are respectively connected with output ends of the CPU1 and the CPU2;
and the load resistor R3 and the load resistor R2 are connected in series and then connected with the weak current power supply circuit in parallel.
7. The safety signal according to claim 6, wherein the weak current supply circuit comprises a power conversion module;
the input end of the power conversion module is connected in parallel with the load resistor R3 and the load resistor R2 which are connected in series;
the output end of the power supply conversion module is connected with the safety control unit and is used for supplying direct current to the safety control unit;
the output end of the power conversion module is also connected with the driving chips of the electronic switch P1 and the electronic switch P2 and is used for supplying direct current to the driving chips;
a fuse and an anti-reflection diode D1 are also connected in series between one input end of the power conversion module and the load resistor R3;
an anti-reflection diode D2 is connected in series between the other input end of the power conversion module and the load resistor R2.
8. A method of controlling a safety signal according to any one of claims 1 to 7, wherein the method of controlling the signal comprises software control and hardware control;
the software control includes: the acquisition unit acquires circuit safety data of the safety driving unit and sends the circuit safety data to the safety control unit for analysis, and the safety control unit sends a feedback signal to the safety driving unit according to the circuit safety data, wherein the feedback signal comprises a relay control signal and a PWM control signal;
the hardware control includes: the safety driving unit extracts current data passing through the safety driving unit, and the safety driving unit is controlled to be turned on or turned off according to the current data.
9. The method of claim 8, wherein the step of the acquisition unit acquiring the circuit safety data of the safety driving unit and transmitting the circuit safety data to the safety control unit specifically comprises:
the self-adaptive monitoring acquisition circuit acquires the environmental temperature data, the environmental humidity data and the light intensity data of the safety annunciator, and the first voltage and current acquisition circuit and the second voltage and current acquisition circuit acquire the input voltage of the relay control circuit, the output voltage of the power control circuit and the driving voltage and the driving current of the LED rectifying circuit;
the self-adaptive monitoring acquisition circuit respectively sends acquired data to the CPU1 and the CPU2 for analysis, and the first voltage and current acquisition circuit and the second voltage and current acquisition circuit respectively send the acquired data to the CPU1 and the CPU2 for analysis.
10. The method according to claim 9, wherein the step of the safety control unit sending a feedback signal to the safety driving unit according to the circuit safety data specifically comprises:
the CPU1 and the CPU2 send relay control signals to the relay control circuit according to the analysis result, when the analysis result is abnormal, the relay control circuit is disconnected, and when the analysis result is normal, the relay control circuit is connected;
the CPU1 and the CPU2 send PWM control signals to the power control circuit according to analysis results, when the analysis results are abnormal, the electronic switch P1 and the electronic switch P2 are disconnected, the power control circuit cuts off input, when the analysis results are normal, the CPU1 and the CPU2 adjust the duty ratios of the electronic switch P1 and the electronic switch P2, and the safety annunciator is normally lightened.
11. The method for controlling a safety signal according to claim 8, wherein the step of controlling the safety driving unit to be turned on or off according to the current data by the safety driving unit comprises the steps of:
collecting current data of a relay control circuit through a current transformer, comparing the current data with a current threshold of a safety relay, and closing the safety relay if the current data meets the current threshold, wherein the relay control circuit works normally;
if the current data does not meet the current threshold value, the safety relay is disconnected, and the relay control circuit cannot work normally;
the current threshold is a current range of normal operation of the safety relay circuit.
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| CN111736563A (en) * | 2020-07-30 | 2020-10-02 | 北京全路通信信号研究设计院集团有限公司 | Control device, distributed control system and control method for annunciator |
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| CN200985032Y (en) * | 2006-12-25 | 2007-12-05 | 王楷迪 | Control system for LED railway signal machine |
| JP2019079190A (en) * | 2017-10-23 | 2019-05-23 | オムロン株式会社 | Output unit, input unit, and input-output system |
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