CN113794613A - Direct-current carrier communication module of locomotive fire-fighting controller - Google Patents
Direct-current carrier communication module of locomotive fire-fighting controller Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40189—Flexible bus arrangements involving redundancy by using a plurality of bus systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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Abstract
The invention discloses a direct current carrier communication module of a locomotive fire controller, which comprises the following parts: the method comprises the following steps: the system comprises a processor unit, a power supply unit, a two-way redundant two-bus processing unit and an external communication interface unit; the dual-path redundant second bus processing unit comprises a first second bus processing unit and a second bus processing unit, wherein the first/second bus processing unit comprises a first/second sending control circuit, a first/second sending signal conversion circuit, a first/second receiving signal processing circuit, a first/second receiving detection circuit and a first/second short-circuit alarm detection circuit. The invention solves the problem that only a fixed number of fire detectors can be detected; the two bus processing units adopt double-path redundancy, and the processor unit automatically starts the other bus after judging the fault of one bus, thereby ensuring the reliability of power supply and data processing of the fire detector on the two buses of the module.
Description
Technical Field
The invention discloses a direct current carrier communication module of a locomotive fire controller, which is applied to a fire detector or a direct current carrier communication system.
Background
A communication module of a general locomotive fire-fighting controller comprises a processor unit, a two-bus communication unit and a power supply unit. The processor unit sends a control signal, and sends a voltage signal through the two-bus communication unit to establish communication with the detector. The data returned by the detector is fed back to the detected data by using the current signal. The current signal returned by the detector is changed into a voltage signal through the sampling resistor, and the voltage signal is compared with a set fixed reference voltage value and then output to the main processor unit. The biggest disadvantage of such a design is that the detection current signal returned by the detectors is compared with a set fixed reference voltage value, and the fixation of the comparison value limits the number of detectors, for example, only a limited number of detectors can be connected, and the detection data is invalid if the number of detectors is exceeded. And is easily interfered by external signals in the detection process to generate invalid data. Meanwhile, when a detector short circuit or a two-bus open circuit fault occurs, the processor cannot give an alarm and relevant remedial measures, so that the whole module is functionally invalid.
Disclosure of Invention
The invention provides a direct current carrier communication module of a locomotive fire controller, which solves the problem that the prior art can only detect a fixed number of fire detectors; meanwhile, the two bus circuits of the direct current carrier wave transmit voltage signals with the voltage of 24VDC to 32VDC, so that the signal level is improved; meanwhile, the device can detect signals with different amplitudes returned by the detector, and outputs the signals to the processor through the shaping circuit with fixed amplitudes.
In order to achieve the above object, a locomotive fire controller direct current carrier communication module, comprising:
the system comprises a processor unit, a power supply unit, a two-way redundant two-bus processing unit and an external communication interface unit; the dual-path redundant second bus processing unit comprises a first second bus processing unit and a second bus processing unit, wherein the first second bus processing unit/the second bus processing unit comprises a first sending control circuit/a second sending control circuit, a first sending signal conversion circuit/a second sending signal conversion circuit, a first receiving signal processing circuit/a second receiving signal processing circuit, a first receiving detection circuit/a second receiving detection circuit and a first short-circuit alarm detection circuit/a second short-circuit alarm detection circuit; the external communication interface unit comprises a CAN communication interface circuit and a serial communication interface circuit; the output end of the processor unit is connected with the input ends of the first sending control circuit/the second sending control circuit of the first two-bus processing unit/the second two-bus processing unit; the output end of the first sending control circuit/the second sending control circuit is connected with the input end of the first sending signal conversion circuit/the second sending signal conversion circuit; the output end of the first transmitting signal conversion circuit/the second transmitting signal conversion circuit is connected with the first fire detector/the second fire detector; the first fire detector/the second fire detector is connected with the first receiving signal processing circuit/the second receiving signal processing circuit; the output end of the first received signal processing circuit/the second received signal processing circuit is connected with the first received detection circuit/the second received detection circuit; the output end of the first receiving detection circuit/the second receiving detection circuit is respectively connected with the processor unit and the first short circuit alarm detection circuit/the second short circuit alarm detection circuit; the processor unit is connected with the CAN communication interface circuit and the serial communication interface circuit; the output end of the first short circuit alarm detection circuit/the second short circuit alarm detection circuit is connected with the second input end of the first sending control circuit/the second sending control circuit; and the power supply unit is respectively connected with the first and second bus processing units/the second bus processing unit, the processor unit and the external communication interface unit.
Further, the first/second transmission control circuits each include a first resistor R311, a second resistor R312, a first nand gate U31A, a second nand gate U31B, a third nand gate U31C, and a fourth nand gate U31D; one end of the first resistor R311 is connected to the pin Data of the processor unit and one input end of the first NAND gate U31A, and the other end is connected to the power supply VCC; the other input end of the first nand gate U31A is connected to the pin En of the processor unit, the second resistor R312 and one input end of the third nand gate U31C; the other end of the second resistor R312 is grounded; two input ends of the second NAND gate U31B are connected, and are connected with the output end of the first NAND gate U31A; the other input end of the third nand gate U31C is connected with the output end of the first nand gate U31A; two input ends of the fourth nand gate U31D are connected and connected with the output end of the third nand gate U31C; the output end of the second nand gate U31B is connected with the 32V control pin of the first transmission signal conversion circuit/the second transmission signal conversion circuit; the output end of the fourth nand gate U31D is connected to the 24V control pin of the first transmit signal conversion circuit/the second transmit signal conversion circuit.
Further, the first transmission signal conversion circuit/the second transmission signal conversion circuit each include a third resistor R321, a first triode Q1, a fourth resistor R322, a first MOS transistor Q5, a first diode D321, a fifth resistor R323, a sixth resistor R324, a second triode Q2, a seventh resistor R325, a third triode Q3, an eighth resistor R326, a second MOS transistor Q6, a second diode D322, a ninth resistor R327, a tenth resistor R328, a fourth triode Q4, and an eleventh resistor R329; one end of a sixth resistor R324 is connected with a 32V control pin of the first sending control circuit/the second sending control circuit, and the other end of the sixth resistor R324 is connected with a base electrode of a second triode Q2; the emitter of the second triode Q2 is grounded; the collector of the second triode Q2 is connected with one end of a fifth resistor R323; one end of a third resistor R321 is connected with a 32V direct-current power supply and an emitting electrode of a first triode Q1; the other end of the third resistor R321 is connected with the base electrode of the first triode Q1, one end of the fourth resistor R322 and the source electrode of the first MOS transistor Q5; a collector of the first triode Q1 is connected with the other end of the fourth resistor R322, the other end of the fifth resistor R323 and the gate of the first MOS transistor Q5; the drain electrode of the first MOS transistor Q5 is connected to the positive electrode of the first diode D321; one end of a tenth resistor R328 is connected with a 24V control pin of the first sending control circuit/the second sending control circuit, and the other end of the tenth resistor R is connected with a base electrode of a fourth triode Q4; the emitter of the fourth triode Q4 is grounded; the collector of the fourth triode Q4 is connected to one end of the ninth resistor R327; one end of a seventh resistor R325 is connected with a 24V direct-current power supply and an emitting electrode of a third triode Q3; the other end of the seventh resistor R325 is connected with the base of the third triode Q3, one end of the eighth resistor R326 and the source of the second MOS transistor Q6; a collector of the third triode Q3 is connected with the other end of the eighth resistor R326, the other end of the ninth resistor R327 and a gate of the second MOS transistor Q6; the drain electrode of the second MOS transistor Q6 is connected to the anode of the second diode D322; the cathode of the first diode D321 is connected to the cathode of the second diode D322, one end of the eleventh resistor R329, and the pin Send of the first/second received signal processing circuit; the other end of the eleventh resistor R329 is grounded.
Further, the first/second receiving signal processing circuit includes a first bidirectional suppressor diode TVS33, a twelfth resistor R33, a first capacitor C331, a common mode choke coil T33, a second capacitor C332, a voltage dependent resistor RV33, and a self-recovery fuse F33; the first bidirectional suppressor TVS33 is connected in parallel to the first capacitor C331, and has one end connected to the output pin Send of the first/second transmission signal conversion circuit and the other end connected to the twelfth resistor R33 and the input pin Vin of the first/second reception detection circuit; the other end of the twelfth resistor R33 is grounded; two ends of the first capacitor C331 are respectively connected with the common mode filter T33; the other end of the common mode filter T33 is connected with a second capacitor C332 and a piezoresistor RV33 in parallel; one end of a piezoresistor RV33 is connected with a self-recovery fuse F33, and the other end of the piezoresistor RV33 is connected with a negative electrode L-of the fire detector; the other end of the self-healing fuse F33 is connected to the positive L + of the fire detector.
Further, the first/second receiving and detecting circuits each include a second bidirectional suppressor diode TVS34, a thirteenth resistor R341, a fourteenth resistor R342, a fifteenth resistor R343, a sixteenth resistor R344, a seventeenth resistor R345, a first voltage comparator U34, and a non-polar capacitor C34; one end of the second bidirectional suppressor diode TVS34 is connected to the thirteenth resistor R341, the fifteenth resistor R343 and the voltage pin Vin after the conversion of the fire detector, and the other end is grounded; the other end of the thirteenth resistor R341 is connected to the fourteenth resistor R342; the other end of the fourteenth resistor R342 is connected to the non-inverting input terminal of the first voltage comparator U34; the other end of the fifteenth resistor R343 is connected to the sixteenth resistor R344 and the non-polar capacitor C34; the other end of the nonpolar capacitor C34 is grounded; the other end of the sixteenth resistor R344 is connected to the inverting input terminal of the first voltage comparator U34; the output end of the first voltage comparator U34 is connected with the seventeenth resistor R345 and the pin Vout of the processor unit; the seventeenth resistor R345 has the other end connected to the power supply Vcc.
Further, the first short circuit alarm detection circuit/the second short circuit alarm detection circuit each include a second voltage comparator U35; the inverting input end of the second voltage comparator U35 is connected with a voltage signal pin Vin converted by the fire detector, and the non-inverting input end of the second voltage comparator U35 is connected with a fixed reference voltage Vref; the output terminal of the second voltage comparator U35 is connected to the pin En of the first/second transmit control circuit.
Compared with the prior art, the direct current carrier communication module of the locomotive fire controller has the following advantages:
under the permission of power supply capacity, an unlimited number of fire detectors can be connected without modifying circuit parameters, so that the installation limitation of a use field is removed, and the installation process is simplified; pulse signals with different amplitudes can be detected and output with fixed voltage amplitudes, so that the voltage level of the input interface of the processor is well adapted; two paths of redundant buses are adopted, one path of fault can start the other path of fault, and reliable communication of the fire detector is guaranteed; the system has a function of alarming and detecting the short circuit of the two buses; the system has the function of two-bus open-circuit alarm detection; the device has the function of wire breaking and partitioning, namely the two buses in two paths can simultaneously work in parallel and automatically partition and independently work under the condition that the transmission line is broken. The invention adopts a low-power consumption control strategy, and closes the peripheral which is not used in an idle state, thereby achieving the purpose of reducing power consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic block diagram of a DC carrier communication module of a fire controller of a locomotive disclosed by the present invention;
FIG. 2 is a diagram of a two-bus transmission control circuit according to the present disclosure;
FIG. 3 is a circuit diagram of a two-bus transmission signal conversion circuit according to the present disclosure;
FIG. 4 is a circuit diagram of a two-bus received signal processing circuit according to the present invention;
FIG. 5 is a circuit diagram of a two-bus receiving detector circuit disclosed in the present invention;
FIG. 6 is a diagram of a two-bus short circuit alarm detection circuit according to the present disclosure;
in the figure, 1, a processor unit; 2. a power supply unit; 3. a first and second bus processing unit; 4. a second bus processing unit; 5. an external communication interface unit; 31. a first transmission control circuit; 32. a first transmission signal conversion circuit; 33. a first received signal processing circuit; 34. a first receiving detector circuit; 35. a first short circuit alarm detection circuit; 36. a second transmission control circuit; 37. a second transmission signal conversion circuit; 38. a second received signal processing circuit; 39. a second receiving detector circuit; 40. a second short circuit alarm detection circuit; 51. a CAN communication interface circuit; 52. a serial communication interface circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
This embodiment provides a locomotive fire control controller direct current carrier communication module, as figure 1, a locomotive fire control controller direct current carrier communication module, its characterized in that includes: the system comprises a processor unit 1, a power supply unit 2, a two-way redundant two-bus processing unit and an external communication interface unit 5; the two-way redundant two-bus processing unit comprises a first two-bus processing unit 3 and a second two-bus processing unit 4,
the first and second bus processing units 3 comprise a first transmission control circuit 31, a first transmission signal conversion circuit 32, a first receiving signal processing circuit 33/, a first receiving detection circuit 34/, and a first short-circuit alarm detection circuit 35;
the second bus processing unit 4 includes a second transmission control circuit 36, a second transmission signal conversion circuit 37, a second reception signal processing circuit 38, a second reception detection circuit 39, and a second short-circuit alarm detection circuit 40;
wherein the external communication interface unit 5 includes a CAN communication interface circuit 51 and a serial communication interface circuit 52; the output end of the processor unit 1 is connected with the input ends of the first sending control circuit 31/the second sending control circuit 36 of the first two-bus processing unit 3/the second two-bus processing unit 4; the output end of the first transmission control circuit 31/the second transmission control circuit 36 is connected with the input end of the first transmission signal conversion circuit 32/the second transmission signal conversion circuit 37; the output end of the first transmitting signal conversion circuit 32/the second transmitting signal conversion circuit 37 is connected with the first fire detector/the second fire detector; the first fire detector/the second fire detector are connected with the first receiving signal processing circuit 33/the second receiving signal processing circuit 38; the output terminals of the first received signal processing circuit 33 and the second received signal processing circuit 38 are connected to the first received detector circuit 34 and the second received detector circuit 39; the output ends of the first receiving detector circuit 34 and the second receiving detector circuit 39 are respectively connected with the processor unit 1 and the first short-circuit alarm detection circuit 35 and the second short-circuit alarm detection circuit 40; the processor unit 1 is connected with a CAN communication interface circuit 51 and a serial communication interface circuit 52; the output end of the first short circuit alarm detection circuit 35/the second short circuit alarm detection circuit 40 is connected with the second input end of the first sending control circuit 31/the second sending control circuit 36; the power supply unit 2 is respectively connected with the first two-bus processing unit 3/the second two-bus processing unit 4, the processor unit 1 and the external communication interface unit 5; referring to fig. 1, the processor unit 1 of the present invention includes an STM32F1 series microprocessor and its external necessary peripheral devices, and outputs Data and control signals to the first transmission control circuit 31/the second transmission control circuit 36 through IO pins Data and En, and collects Vin signals output by the first reception detector circuit 34/the second reception detector circuit 39 for digital signal analysis and fault alarm detection; the status data and alarm status of the fire detector are transmitted to the external controller through the external communication interface unit 5. The power supply unit 2 is configured to convert an externally input power supply voltage into a power supply voltage required by the entire module, including power supplies of two buses, i.e., a direct current 32V and a direct current 24V, and a processor, i.e., a 3.3V power supply. Each path of the two-path redundant two-bus processing unit comprises a sending control circuit, a sending signal conversion circuit, a receiving signal processing circuit, a receiving detection circuit and a short circuit alarm detection circuit. In this embodiment, the two-way redundant two-bus adopts two identical first and second bus processing units 3 and 4, and the processor unit 1 determines whether to use one of the two bus processing units or simultaneously use two of the two bus processing units according to the fault alarm state of the bus. The system is used for sending data to the fire detector and receiving data from the fire detector through the two buses, and setting corresponding software and hardware judgment strategies to judge bus short-circuit faults and open-circuit faults for protection; when the processor unit 1 detects a fault of one of the two buses, the other two buses can be started immediately, and reliable communication of the fire detector is guaranteed. The external communication interface unit 5 includes a CAN communication interface circuit 51, a serial communication interface circuit 52, and CAN communicate with an external controller.
In a specific embodiment, in view of the fact that the first transmission control circuit 31 is consistent with the internal circuit of the second transmission control circuit 36, only a specific circuit example of the first transmission control circuit 31 is given in this example; the first transmission control circuit 31 comprises a first resistor R311, a second resistor R312, a first NAND gate U31A, a second NAND gate U31B, a third NAND gate U31C and a fourth NAND gate U31D; one end of the first resistor R311 is connected to the pin Data of the processor unit 1 and one input end of the first NAND gate U31A, and the other end is connected to the power supply VCC; the other input end of the first nand gate U31A is connected to the pin En of the processor unit 1, the second resistor R312 and one input end of the third nand gate U31C; the other end of the second resistor R312 is grounded; two input ends of the second NAND gate U31B are connected, and are connected with the output end of the first NAND gate U31A; the other input end of the third nand gate U31C is connected with the output end of the first nand gate U31A; two input ends of the fourth nand gate U31D are connected and connected with an output end of the third nand gate U31C; the output end of the second nand gate U31B is connected to the 32V control pin of the first transmission signal conversion circuit 32/second transmission signal conversion circuit 37; the output terminal of the fourth nand gate U31D is connected to the 24V control pin of the first/second transmission signal conversion circuit 32/37.
Referring to fig. 2, the first transmission control circuit 31/the second transmission control circuit 36 is a judgment of the output enable control signal En of the processor unit 1 and the Data output by the processor unit 1 by the logic circuit, and then transmits the result of the logic judgment to the first transmission signal conversion circuit 32/the second transmission signal conversion circuit 37, so as to realize that the processor unit 1 transmits Data onto the two buses, i.e., the voltage signals on the control two buses are 32V, 24V, 0V.
In the specific embodiment, in view of the fact that the first transmission signal conversion circuit 32 coincides with the internal circuit of the second transmission signal conversion circuit 37, only a specific circuit example of the first transmission signal conversion circuit 32 is given in this example; the first transmission signal conversion circuit 32/the second transmission signal conversion circuit 37 each include a third resistor R321, a first transistor Q1, a fourth resistor R322, a first MOS transistor Q5, a first diode D321, a fifth resistor R323, a sixth resistor R324, a second transistor Q2, a seventh resistor R325, a third transistor Q3, an eighth resistor R326, a second MOS transistor Q6, a second diode D322, a ninth resistor R327, a tenth resistor R328, a fourth transistor Q4, and an eleventh resistor R329; one end of the sixth resistor R324 is connected to the 32V control pin of the first transmission control circuit 31/the second transmission control circuit 36, and the other end is connected to the base of the second transistor Q2; the emitter of the second triode Q2 is grounded; the collector of the second triode Q2 is connected with one end of a fifth resistor R323; one end of the third resistor R321 is connected with a 32V direct-current power supply and an emitting electrode of the first triode Q1; the other end of the third resistor R321 is connected with the base electrode of the first triode Q1, one end of the fourth resistor R322 and the source electrode of the first MOS transistor Q5; a collector of the first triode Q1 is connected with the other end of the fourth resistor R322, the other end of the fifth resistor R323 and a gate of the first MOS transistor Q5; the drain electrode of the first MOS tube Q5 is connected with the anode of a first diode D321; one end of the tenth resistor R328 is connected to the 24V control pin of the first transmission control circuit 31/the second transmission control circuit 36, and the other end is connected to the base of the fourth transistor Q4; the emitter of the fourth triode Q4 is grounded; the collector of the fourth triode Q4 is connected to one end of a ninth resistor R327; one end of the seventh resistor R325 is connected with a 24V direct-current power supply and an emitting electrode of a third triode Q3; the other end of the seventh resistor R325 is connected with the base electrode of the third triode Q3, one end of the eighth resistor R326 and the source electrode of the second MOS tube Q6; a collector of the third triode Q3 is connected with the other end of the eighth resistor R326, the other end of the ninth resistor R327 and a gate of the second MOS transistor Q6; the drain electrode of the second MOS tube Q6 is connected with the anode of a second diode D322; the cathode of the first diode D321 is connected to the cathode of the second diode D322, one end of the eleventh resistor R329, and the pin Send of the first/second received signal processing circuits 33 and 38; the other end of the eleventh resistor R329 is grounded; referring to fig. 3, the first transmission signal conversion circuit 32/the second transmission signal conversion circuit 37 receive control signals of the first transmission control circuit 31/the second transmission control circuit 36 to apply different voltage signals to the two buses.
In a specific embodiment, in view of the fact that the first received signal processing circuit 33 and the second received signal processing circuit 38 have the same internal circuit, only a specific circuit example of the first received signal processing circuit 33 is given in this example; the first/second received signal processing circuits 33, 38 include a first bidirectional suppressor TVS33, a twelfth resistor R33, a first capacitor C331, a common mode choke T33, a second capacitor C332, a voltage dependent resistor RV33, and a self-recovery fuse F33; the first bidirectional suppressor diode TVS33 is connected in parallel to the first capacitor C331, and has one end connected to the output terminal Send of the first transmission signal conversion circuit 32/second transmission signal conversion circuit 37 and the other end connected to the twelfth resistor R33 and the input terminal Vin of the first reception detection circuit 34/second reception detection circuit 39; the other end of the twelfth resistor R33 is grounded; two ends of the first capacitor C331 are respectively connected with a common mode filter T33; the other end of the common mode filter T33 is connected with a second capacitor C332 and a piezoresistor RV33 in parallel; one end of the piezoresistor RV33 is connected with a self-recovery fuse F33, and the other end of the piezoresistor RV33 is connected with a negative electrode L-of the fire detector; the other end of the self-recovery fuse F33 is connected to the positive electrode L + of the fire detector. Referring to fig. 4, the first/second receiving signal processing circuits 33 and 38 protect and filter the current signal of the fire detector, and then convert the current signal into a voltage signal through a sampling resistor.
In the specific embodiment, in view of the fact that the first reception detector circuit 34 corresponds to the internal circuit of the second reception detector circuit 39, only a specific circuit example of the first reception detector circuit 34 is given in this example; the first/second receiving detector circuits 34/39 each include a second bidirectional suppressor diode TVS34, a thirteenth resistor R341, a fourteenth resistor R342, a fifteenth resistor R343, a sixteenth resistor R344, a seventeenth resistor R345, a first voltage comparator U34, and a nonpolar capacitor C34; one end of the second bidirectional suppressor diode TVS34 is connected to the thirteenth resistor R341, the fifteenth resistor R343 and the voltage pin Vin after the conversion of the fire detector, and the other end is grounded; the other end of the thirteenth resistor R341 is connected to the fourteenth resistor R342; the other end of the fourteenth resistor R342 is connected to the non-inverting input terminal of the first voltage comparator U34; the other end of the fifteenth resistor R343 is connected with a sixteenth resistor R344 and a non-polar capacitor C34; the other end of the nonpolar capacitor C34 is grounded; the other end of the sixteenth resistor R344 is connected with the inverting input end of the first voltage comparator U34; the output end of the first voltage comparator U34 is connected with a seventeenth resistor R345 and a pin Vout of the processor unit 1; the seventeenth resistor R345 is connected to a power source Vcc at the other end. Referring to fig. 5, the first receiving detector circuit 34/the second receiving detector circuit 39, the voltage signal Vin converted by the fire detector is divided into two paths, which are respectively sent to the non-inverting and inverting input terminals of the voltage comparator, wherein the input negative pulse signal has a smooth waveform after being filtered by the resistance-capacitance filter, and the waveform is compared with the input positive pulse signal, and the comparator outputs a pulse with a fixed amplitude.
In a specific embodiment, since the first short-circuit alarm detection circuit 35 and the second short-circuit alarm detection circuit 40 have the same internal circuit, only a specific circuit example of the first short-circuit alarm detection circuit 35 is given in this example; the first short circuit alarm detection circuit 35/the second short circuit alarm detection circuit 40 both comprise a second voltage comparator U35; the inverting input end of the second voltage comparator U35 is connected with a voltage signal pin Vin converted by the fire detector, and the non-inverting input end of the second voltage comparator U35 is connected with a fixed reference voltage Vref; the output terminal of the second voltage comparator U35 is connected to the pin En of the first/second transmit control circuits 31, 36. Referring to fig. 6, the first/second short alarm detection circuits 35/40 are used to cut off power when the fire detector is short-circuited and alarm an external controller. The first short circuit alarm detection circuit 35/the second short circuit alarm detection circuit 40 compares the voltage signal Vin converted by the fire detector with the fixed reference voltage Vref, the comparator outputs the voltage signal Vin to the first sending control circuit 31/the second sending control circuit 36, the comparator is used for cutting off the power supply of the fire detector from hardware in time, and when the processor unit 1 detects that the voltage signal Vin is too large and lasts for 500 milliseconds, the processor unit 1 detects a short circuit alarm and transmits an alarm state to an external controller through the CAN communication interface circuit 51 or the serial communication interface circuit 52.
In this embodiment, the direct current carrier communication module of the locomotive fire controller further has an open-circuit alarm detection function, and is configured to alarm to an external controller when detecting an open-circuit fault of the two buses. The open alarm detection function is completely judged by software of the processor unit 1, specifically, when the processor unit 1 detects that the voltage signal Vin is too small and close to 0 and lasts for 500 milliseconds, the open alarm is detected, and an alarm state is transmitted to an external controller through the CAN communication interface circuit 51 or the serial communication interface circuit 52.
In this embodiment, based on the two-way bus structure, the direct current carrier communication module of the locomotive fire controller further has a function of line breaking and partitioning, and the two-way bus structure is used for partitioning and parallel operation when a transmission line is disconnected. The disconnection partition strategy corresponding to the disconnection partition function comprises the following steps: when one path of two buses is used, after the processor unit 1 detects open circuit alarm, namely disconnection fault occurs on the transmission lines of the current two buses, the processor unit 1 starts another path of two bus interfaces, namely two paths of two buses can work simultaneously, the two bus interfaces are jointly arranged on a two bus loop consisting of a plurality of fire detectors and two paths of two bus interfaces of a direct current carrier communication module, the two bus loop is divided into two independent partitions from the position where the transmission lines are disconnected, and each partition is provided with one path of two bus interface of the direct current carrier communication module. Thus, although the transmission line is disconnected, most of the fire detectors are not disconnected in power supply and data processing, and the integrity of the whole fire detector system is guaranteed to the greatest extent possible.
The fault alarm output by the invention comprises but is not limited to a detector short circuit alarm, a two-bus open circuit alarm, a first two-bus fault alarm and a second two-bus fault alarm.
The two-bus direct current detection communication module of the invention compares the set fixed reference voltage value with the detected instantaneous value instead of the average value formed by the first receiving detection circuit 34/the second receiving detection circuit 39, the average value is formed by filtering the signal returned by the fire detector and is changed along with the change of the returned signal, therefore, the two-bus direct current detection communication module is not limited by the number of fire detectors and can be used for any number of fire detectors.
Secondly, the direct current detection module collects and controls the fire detector in a two-bus mode, and the two buses bear signals from 24VDC to 32VDC, so that the signal level is improved; two paths of redundant buses are adopted, and one path of fault can start the other path of fault; transmitting detection information related to the fire detector to a main control unit by using CAN communication; with open fault detection; short-circuit fault detection function; simultaneously converting the acquired digital pulse signals into fixed-amplitude voltage for output; processor unit 1 uses an STM32F1 series microprocessor chip; the invention adopts a low-power consumption control strategy, and closes the peripheral which is not used in an idle state, thereby achieving the purpose of reducing power consumption.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a locomotive fire control controller direct current carrier communication module which characterized in that includes: the system comprises a processor unit (1), a power supply unit (2), a two-way redundant two-bus processing unit and an external communication interface unit (5); the dual-path redundant second bus processing unit comprises a first second bus processing unit (3) and a second bus processing unit (4), wherein the first second bus processing unit (3)/the second bus processing unit (4) comprises a first sending control circuit (31)/a second sending control circuit (36), a first sending signal conversion circuit (32)/a second sending signal conversion circuit (37), a first receiving signal processing circuit (33)/a second receiving signal processing circuit (38), a first receiving detection circuit (34)/a second receiving detection circuit (39), a first short-circuit alarm detection circuit (35)/a second short-circuit alarm detection circuit (40); the external communication interface unit (5) includes a CAN communication interface circuit (51) and a serial communication interface circuit (52); the output end of the processor unit (1) is connected with the input ends of a first sending control circuit (31)/a second sending control circuit (36) of the first two-bus processing unit (3)/the second two-bus processing unit (4); the output end of the first transmission control circuit (31)/the second transmission control circuit (36) is connected with the input end of the first transmission signal conversion circuit (32)/the second transmission signal conversion circuit (37); the output end of the first sending signal conversion circuit (32)/the second sending signal conversion circuit (37) is connected with a first fire detector/a second fire detector; the first fire detector/the second fire detector is connected with the first receiving signal processing circuit (33)/the second receiving signal processing circuit (38); the output ends of the first received signal processing circuit (33)/the second received signal processing circuit (38) are connected with a first received detection circuit (34)/a second received detection circuit (39); the output ends of the first receiving detection circuit (34) and the second receiving detection circuit (39) are respectively connected with the processor unit (1) and the first short-circuit alarm detection circuit (35) and the second short-circuit alarm detection circuit (40); the processor unit (1) is connected with a CAN communication interface circuit (51) and a serial communication interface circuit (52); the output end of the first short circuit alarm detection circuit (35)/the second short circuit alarm detection circuit (40) is connected with the second input end of the first transmission control circuit (31)/the second transmission control circuit (36); the power supply unit (2) is respectively connected with the first and second bus processing units (3) and (4), the processor unit (1) and the external communication interface unit (5).
2. The locomotive fire control controller direct current carrier communication module of claim 1, wherein:
the first sending control circuit (31)/the second sending control circuit (36) comprise a first resistor R311, a second resistor R312, a first NAND gate U31A, a second NAND gate U31B, a third NAND gate U31C and a fourth NAND gate U31D; one end of the first resistor R311 is connected with a pin Data of the processor unit (1) and one input end of the first NAND gate U31A, and the other end is connected with a power supply VCC; the other input end of the first NAND gate U31A is connected with a pin En of the processor unit (1), the second resistor R312 and one input end of a third NAND gate U31C; the other end of the second resistor R312 is grounded; two input ends of the second NAND gate U31B are connected, and are connected with the output end of the first NAND gate U31A; the other input end of the third nand gate U31C is connected with the output end of the first nand gate U31A; two input ends of the fourth nand gate U31D are connected and connected with an output end of the third nand gate U31C; the output end of the second NAND gate U31B is connected with the 32V control pin of the first transmission signal conversion circuit (32)/the second transmission signal conversion circuit (37); the output end of the fourth nand gate U31D is connected to the 24V control pin of the first transmission signal conversion circuit (32)/the second transmission signal conversion circuit (37).
3. The locomotive fire control controller direct current carrier communication module of claim 1, wherein:
the first transmission signal conversion circuit (32)/the second transmission signal conversion circuit (37) respectively comprise a third resistor R321, a first triode Q1, a fourth resistor R322, a first MOS tube Q5, a first diode D321, a fifth resistor R323, a sixth resistor R324, a second triode Q2, a seventh resistor R325, a third triode Q3, an eighth resistor R326, a second MOS tube Q6, a second diode D322, a ninth resistor R327, a tenth resistor R328, a fourth triode Q4 and an eleventh resistor R329; one end of the sixth resistor R324 is connected with a 32V control pin of the first sending control circuit (31)/the second sending control circuit (36), and the other end of the sixth resistor R324 is connected with a base electrode of a second triode Q2; the emitter of the second triode Q2 is grounded; the collector of the second triode Q2 is connected with one end of a fifth resistor R323; one end of the third resistor R321 is connected with a 32V direct-current power supply and an emitting electrode of the first triode Q1; the other end of the third resistor R321 is connected with the base electrode of the first triode Q1, one end of the fourth resistor R322 and the source electrode of the first MOS transistor Q5; a collector of the first triode Q1 is connected with the other end of the fourth resistor R322, the other end of the fifth resistor R323 and a gate of the first MOS transistor Q5; the drain electrode of the first MOS tube Q5 is connected with the anode of a first diode D321; one end of the tenth resistor R328 is connected with a 24V control pin of the first sending control circuit (31)/the second sending control circuit (36), and the other end is connected with a base electrode of a fourth triode Q4; the emitter of the fourth triode Q4 is grounded; the collector of the fourth triode Q4 is connected to one end of a ninth resistor R327; one end of the seventh resistor R325 is connected with a 24V direct-current power supply and an emitting electrode of a third triode Q3; the other end of the seventh resistor R325 is connected with the base electrode of the third triode Q3, one end of the eighth resistor R326 and the source electrode of the second MOS tube Q6; a collector of the third triode Q3 is connected with the other end of the eighth resistor R326, the other end of the ninth resistor R327 and a gate of the second MOS transistor Q6; the drain electrode of the second MOS tube Q6 is connected with the anode of a second diode D322; the cathode of the first diode D321 is connected with the cathode of the second diode D322, one end of the eleventh resistor R329 and a pin Send of the first received signal processing circuit (33)/the second received signal processing circuit (38); the other end of the eleventh resistor R329 is grounded.
4. The locomotive fire control controller direct current carrier communication module of claim 1, wherein:
the first receiving signal processing circuit (33)/the second receiving signal processing circuit (38) comprises a first bidirectional suppression diode TVS33, a twelfth resistor R33, a first capacitor C331, a common mode choke coil T33, a second capacitor C332, a voltage dependent resistor RV33 and a self-recovery fuse F33; the first bidirectional suppressor TVS33 is connected in parallel with the first capacitor C331, and has one end connected to the output terminal Send of the first transmission signal conversion circuit (32)/the second transmission signal conversion circuit (37) and the other end connected to the twelfth resistor R33 and the input terminal Vin of the first reception detection circuit (34)/the second reception detection circuit (39); the other end of the twelfth resistor R33 is grounded; two ends of the first capacitor C331 are respectively connected with a common mode filter T33; the other end of the common mode filter T33 is connected with a second capacitor C332 and a piezoresistor RV33 in parallel; one end of the piezoresistor RV33 is connected with a self-recovery fuse F33, and the other end of the piezoresistor RV33 is connected with a negative electrode L-of the fire detector; the other end of the self-recovery fuse F33 is connected to the positive electrode L + of the fire detector.
5. The locomotive fire control controller direct current carrier communication module of claim 1, wherein:
the first receiving detector circuit (34)/the second receiving detector circuit (39) each include a second bidirectional suppressor diode TVS34, a thirteenth resistor R341, a fourteenth resistor R342, a fifteenth resistor R343, a sixteenth resistor R344, a seventeenth resistor R345, a first voltage comparator U34 and a non-polar capacitor C34; one end of the second bidirectional suppressor diode TVS34 is connected to the thirteenth resistor R341, the fifteenth resistor R343 and the voltage pin Vin after the conversion of the fire detector, and the other end is grounded; the other end of the thirteenth resistor R341 is connected to the fourteenth resistor R342; the other end of the fourteenth resistor R342 is connected to the non-inverting input terminal of the first voltage comparator U34; the other end of the fifteenth resistor R343 is connected with a sixteenth resistor R344 and a non-polar capacitor C34; the other end of the nonpolar capacitor C34 is grounded; the other end of the sixteenth resistor R344 is connected with the inverting input end of the first voltage comparator U34; the output end of the first voltage comparator U34 is connected with a seventeenth resistor R345 and a pin Vout of the processor unit (1); the seventeenth resistor R345 is connected to a power source Vcc at the other end.
6. The locomotive fire control controller direct current carrier communication module of claim 1, wherein:
the first short circuit alarm detection circuit (35)/the second short circuit alarm detection circuit (40) comprise a second voltage comparator U35; the inverting input end of the second voltage comparator U35 is connected with a voltage signal pin Vin converted by the fire detector, and the non-inverting input end of the second voltage comparator U35 is connected with a fixed reference voltage Vref; the output end of the second voltage comparator U35 is connected with a pin En of the first transmission control circuit (31)/the second transmission control circuit (36).
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