CN112798981A - Road traffic system with alternating current monitoring and protecting functions - Google Patents
Road traffic system with alternating current monitoring and protecting functions Download PDFInfo
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Abstract
The invention discloses a road traffic system with an alternating current monitoring and protecting function, which relates to the technical field of road traffic.A current filtering lightning protection leakage sampling circuit in the device samples alternating current and induces lightning stroke signals and leakage signals, a leakage current detection terminal led out by the current filtering lightning protection leakage sampling circuit is connected to a signal conversion circuit, a voltage and current sampling circuit is also connected with the alternating current, a voltage sampling output end and a current sampling output end are both connected to the signal conversion circuit, the output of the signal conversion circuit and the lightning stroke signals are both connected to a signal operation control circuit so as to drive an output control drive circuit to control the on-off of power supply for road traffic equipment.
Description
Technical Field
The invention relates to the technical field of road traffic, in particular to a road traffic system with an alternating current monitoring and protecting function.
Background
With the development of domestic economic science and technology, urban population increases, and the quantity of urban vehicles is also expanded in a blowout manner, so that urban road traffic is directly driven to make a leap-type development, which is mainly reflected in the expansion and the complication of a road traffic network. In addition, in order to effectively manage or improve the traffic quality to the maximum extent, the intelligentization of the road traffic network is rapidly developed, the technology updating frequency is faster and faster, and new equipment is continuously and greatly put into use.
The intelligentization of the urban road traffic network is mainly represented by road electronic police, flow detection, V2X (vehicle wireless communication technology), video detection and monitoring, bus priority, intersection traffic light control, illumination, network communication and the like. The intelligent devices are located in all corners of a city and located in various outdoor environments, the intelligent devices need alternating current for normal operation, but the problems that the electricity-taking environment at a crossing is not good, the distance of a stay wire is long, circuits are complex and various, the environment temperature and humidity are high, interference sources are multiple, electric devices are multiple, energy consumption is high and the like exist often, the alternating current power supply is easy to interfere due to the industrial field environment problems, for example, the alternating current power supply is easy to be struck by lightning, static electricity is introduced, voltage fluctuation is large and unstable, surges and the like, and the problems are likely to cause the devices to be incapable of normal work or permanently damage.
Disclosure of Invention
The invention provides a road traffic system with an alternating current monitoring and protecting function aiming at the problems and the technical requirements, and the technical scheme of the invention is as follows:
a road traffic system with ac monitoring protection, the road traffic system comprising: the lightning protection leakage detection circuit comprises an alternating current filtering lightning protection leakage sampling circuit, a voltage and current sampling circuit, a signal conversion circuit, a signal operation control circuit and an output control driving circuit;
the sampling input end of the alternating current filtering lightning protection leakage sampling circuit is connected with alternating current for sampling, the alternating current filtering lightning protection leakage sampling circuit leads out a lightning stroke detection terminal, a leakage current detection terminal and a sampling output end, the alternating current filtering circuit outputs a lightning stroke signal through the lightning stroke detection terminal when the sampled alternating current senses lightning stroke, and outputs a leakage current signal through the leakage current detection terminal when the leakage current is detected;
the voltage sampling input end of the voltage and current sampling circuit is connected with alternating current, the current sampling input end is connected with the sampling output end of the alternating current filtering lightning protection leakage sampling circuit, and the voltage and current sampling circuit leads out a voltage sampling output end output and a current sampling output end;
the signal conversion circuit converts one of three signals of a leakage current detection terminal of the alternating current filtering lightning-protection leakage sampling circuit, a voltage sampling output end of the voltage current sampling circuit and a current sampling output end and outputs the converted signal to the signal operation control circuit;
the signal operation control circuit controls the state of a load switch according to the lightning stroke signal and the signal output by the pulse signal conditioning and sampling circuit, and the load switch is connected to a power supply path from the alternating current to the road traffic equipment.
The beneficial technical effects of the invention are as follows:
the application discloses road traffic system with alternating current monitoring safeguard function, the device to the complicated harsh road traffic power consumption environment of industrial field, to the alternating current real time monitoring of input, provide safety protection for road traffic equipment, the components and parts that use in the circuit all adopt industrial grade device, the operation is reliable and stable, environmental adaptation scope is wide. The circuit device is universal in type selection, easy to replace, low in cost and easy to maintain, and the product is ingenious in principle and concept, mature in technology, safe, reliable, practical in function, low in cost and convenient to use.
Drawings
Fig. 1 is a circuit configuration diagram of a road traffic system disclosed in the present application.
Fig. 2 is a circuit diagram of an ac filtering lightning leakage prevention sampling circuit according to the present application.
Fig. 3 is a circuit diagram of a voltage-current sampling circuit in the present application.
Fig. 4 is a circuit diagram of a signal selection circuit in the present application.
Fig. 5 is a circuit diagram of an effective value conversion circuit in the present application.
Fig. 6 is a circuit diagram of a pulse signal conditioning sampling circuit in the present application.
Fig. 7 is a circuit diagram of a signal operation control circuit in the present application.
Fig. 8 is a circuit diagram of an output control driver circuit in the present application.
Fig. 9 is a circuit diagram of an ac/dc conversion circuit according to the present application.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
The application discloses a road traffic system with alternating current monitoring and protection functions, please refer to fig. 1, and the road traffic system comprises an alternating current filtering lightning protection leakage sampling circuit, a voltage and current sampling circuit, a signal conversion circuit, a signal operation control circuit and an output control drive circuit.
The sampling input end of the alternating current filtering lightning protection leakage sampling circuit is connected with alternating current for sampling, the alternating current filtering lightning protection leakage sampling circuit gives out a lightning stroke detection terminal, a leakage current detection terminal and a sampling output end, and the alternating current filtering circuit outputs a lightning stroke signal through the lightning stroke detection terminal when sensing lightning stroke based on the sampled alternating current and outputs a leakage current signal through the leakage current detection terminal when detecting leakage current.
The voltage sampling input end of the voltage and current sampling circuit is connected with alternating current, the current sampling input end is connected with the sampling output end of the alternating current filtering lightning protection leakage sampling circuit, and the voltage and current sampling circuit leads out a voltage sampling output end output and a current sampling output end.
The signal conversion circuit converts one of three signals of a leakage current detection terminal of the alternating current filtering lightning-protection leakage sampling circuit, a voltage sampling output end of the voltage current sampling circuit and a current sampling output end and outputs the converted signal to the signal operation control circuit.
The signal operation control circuit controls the state of a load switch according to the lightning stroke signal and the signal output by the pulse signal conditioning and sampling circuit, and the load switch is connected to a power supply path from the alternating current to the road traffic equipment.
The lightning stroke sensing circuit and the surge suppression circuit are sequentially arranged from the sampling input end to the sampling output end in the alternating current filtering lightning protection leakage sampling circuit, the lightning stroke sensing circuit leads out a lightning stroke detection terminal, and the surge suppression circuit leads out a leakage current detection terminal and the sampling output end of the alternating current filtering lightning protection leakage sampling circuit.
Referring to the circuit diagram of the ac filtering lightning protection leakage sampling circuit shown in fig. 2, the sampling input end of the ac filtering lightning protection leakage sampling circuit is connected to the live line FACL and the null line FACN of the ac (the 3 rd pin of the connector J1 at the sampling input end of the ac filtering lightning protection leakage sampling circuit in fig. 2 is connected to the live line FACL, and the 2 nd pin is connected to the null line FACN). A lightning stroke induction circuit and a surge suppression circuit are sequentially arranged in the alternating current filtering lightning protection leakage sampling circuit from a sampling input end to a sampling output end, lightning stroke detection terminals LJ + and LJ-are led out of the lightning stroke induction circuit, and leakage current detection terminals LL-and LL + and sampling output ends FACI and FACN are led out of the surge suppression circuit.
In the application, a lightning stroke sensing circuit in an alternating current filtering lightning protection leakage sampling circuit provides three-level lightning protection treatment, and the lightning stroke sensing circuit comprises a first piezoresistor RV1, a second piezoresistor RV2, a third piezoresistor RV3, a fourth piezoresistor RV4, a first temperature fuse TF1, a second temperature fuse TF2, a third temperature fuse TF3, a first gas discharge tube G1, a second gas discharge tube G2, a third gas discharge tube G3 and a first Hall sensor H1, wherein the model of the first Hall sensor H1 in the application is SCT203F 1-DW. One end of a series circuit formed by the first piezoresistor RV1, the first temperature fuse TF1 and the first gas discharge tube G1 is connected with an alternating current live wire FACL, the other end of the series circuit is connected with a second input end (a 2 nd pin) of the first Hall sensor H1, one end of a series circuit formed by the second piezoresistor RV2, the second temperature fuse TF2 and the second gas discharge tube G2 is connected with an alternating current neutral wire FACN, the other end of the series circuit is connected with a second input end of the first Hall sensor H1, the alternating current live wire FACL is further connected with the alternating current neutral wire FACN through the third piezoresistor RV3 and the fourth piezoresistor RV4, a common end of the third piezoresistor RV3 and the fourth piezoresistor RV4 is sequentially connected with the third temperature fuse TF3, the third gas discharge tube G3 and is connected with a second input end of the first Hall sensor H1, a first input end (a 1 st ground wire) of the first Hall sensor H1, a first Hall sensing end (a second Hall sensing pin (a second sensing pin) (a 3) of the first Hall sensor H1) and lightning strike detection terminals LJ + and LJ-.
The surge suppression circuit in the alternating current filtering lightning protection leakage sampling circuit comprises a first inductor L1, a second inductor L2, a fifth piezoresistor RV5, a sixth piezoresistor RV6, a seventh piezoresistor RV7, a fourth temperature fuse TF4, a fifth temperature fuse TF5, a sixth temperature fuse TF6, a fourth gas discharge tube G4, a common-mode inductor GT1, a first transient suppression diode TVS1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a slow-fusing fuse F1, a first negative temperature coefficient resistor TR1 and a second Hall sensor H2, wherein the model of the second Hall sensor H2 is SCT214F 3. The dotted end of the first winding of the common-mode inductor GT1 is connected with an alternating-current live wire FACL through a first inductor L1, the dotted end of the second winding of the common-mode inductor GT1 is connected with an alternating-current neutral wire FACN through a second inductor L2, the dotted end of the first winding of the common-mode inductor GT1 is further connected with the dotted end of the second winding of the common-mode inductor GT1 through a fifth piezoresistor RV5 and a fourth temperature fuse TF4 in sequence, and the dotted end of the first winding of the common-mode inductor GT1 is further connected with the dotted end of the second winding of the common-mode inductor GT1 through a sixth piezoresistor RV6 and a seventh piezoresistor RV7 in sequence; the common end of the sixth piezoresistor RV6 and the seventh piezoresistor RV7 is sequentially connected with the fifth temperature fuse TF5 and the fourth gas discharge tube G4 and connected with the second input end of the first Hall sensor H1. The synonym terminal of the first winding of the common-mode inductor GT1 is connected to the first input terminal (pin 1) of the second hall sensor H2 through a slow-fuse F1, and the synonym terminal of the second winding of the common-mode inductor GT1 is connected to the second input terminal (pin 2) of the second hall sensor H2 through a first negative temperature coefficient resistor TR 1. The synonym terminal of the first winding of the common-mode inductor GT1 is further connected in sequence with the first transient suppression diode TVS1 and the sixth thermal fuse TF6 and with the synonym terminal of the second winding of the common-mode inductor GT1, and the synonym terminal of the first winding of the common-mode inductor GT1 is further connected with the synonym terminal of the second winding of the common-mode inductor GT1 through a third capacitor C3. The synonym terminal of the first winding of the common-mode inductor GT1 is further connected to the second input terminal of the first hall sensor H1 via a second capacitor C2, and the synonym terminal of the second winding of the common-mode inductor GT1 is further connected to the second input terminal of the first hall sensor H1 via a first capacitor C1. Sampling output ends FACI and FACN of the alternating current filtering lightning protection leakage sampling circuit are led out from a first output end (a 4 th pin) and a second output end (a 3 rd pin) of the second Hall sensor H2, a first output end and a first input end of the second Hall sensor H2 are communicated, a second output end and a second input end of the second Hall sensor H2 are communicated, and leakage current detection terminals LL + and LL-are respectively led out from a first induction end (a 5 th pin) and a second induction end (a 6 th pin) of the second Hall sensor H2.
The voltage sampling input end of the voltage and current sampling circuit is connected with alternating currents FACL and FACN, the current sampling input end is connected with the sampling output ends FACI and FACN of the alternating current filtering lightning protection leakage sampling circuit, and the voltage and current sampling circuit leads out voltage sampling output ends DV + and DV-and current sampling output ends DL + and DL-. Referring to the circuit diagram of the voltage-current sampling circuit shown in fig. 3, in the voltage-current sampling circuit, two input terminals of a third hall sensor H3 respectively lead out a current sampling input terminal of the voltage-current sampling circuit to be connected with sampling output terminals FACI and FACN of the ac filtering lightning protection leakage sampling circuit, an output terminal of the third hall sensor H3 leads out current sampling output terminals DL + and DL "of the voltage-current sampling circuit, a forty-third resistor R43 and a forty-first capacitor C41 are further connected between the two current sampling output terminals DL + and DL" of the voltage-current sampling circuit, and the model of the third hall sensor H3 in the present application is SCT211 FK. A first input end of a fourth hall sensor H4 leads out one voltage sampling input end of a voltage and current sampling circuit through a fourth eleventh resistor R41 and a forty resistor R40 to be connected with a live wire FACL of alternating current, a second input end of the fourth hall sensor H4 leads out the other voltage sampling input end of the voltage and current sampling circuit to be connected with a zero wire FACN of alternating current, two output ends of the fourth hall sensor H4 lead out voltage sampling output ends DV + and DV of the voltage and current sampling circuit, a forty-second resistor R42 and a forty capacitor C40 are further connected between the two voltage sampling output ends of the voltage and current sampling circuit, and the model of the fourth hall sensor H4 in the application is SPT 204A.
The input end of the signal conversion circuit is respectively connected with the leakage current detection terminals LL-and LL + of the alternating current filtering lightning-protection leakage sampling circuit, the voltage sampling output ends DV + and DV-of the voltage and current sampling circuit and the current sampling output ends DL + and DL-, and the output end of the signal conversion circuit is connected with the signal operation control circuit. In the application, the signal conversion circuit comprises a signal selection circuit and an effective value conversion circuit, the signal selection circuit is realized based on a multi-channel digital control analog switch, three groups of input ends of the signal selection circuit are respectively connected with leakage current detection terminals LL-and LL + of an alternating current filtering lightning protection leakage sampling circuit, voltage sampling output ends DV + and DV-of the voltage current sampling circuit and current sampling output ends DL + and DL-, an output end AD + and AD-of the signal selection circuit are connected with the input end of the effective value conversion circuit, the effective value conversion circuit is realized based on an amplification circuit and a true effective value converter, and the output end of the effective value conversion circuit is connected with a signal operation control circuit.
Referring to the circuit diagram of the signal selection circuit shown in fig. 4, the signal selection circuit is implemented based on a digitally controlled analog switch of CD4052, three sets of input terminals of the digitally controlled analog switch CD4052 are respectively connected to the leakage current detection terminals LL-and LL +, the voltage sampling output terminals DV + and DV-, and the current sampling output terminals DL + and DL-, and the output terminals AD + and AD-of the digitally controlled analog switch CD4052 are connected to the input terminal of the virtual value conversion circuit.
Referring to the circuit diagram of the effective value converting circuit shown in fig. 5, in the effective value converting circuit, the inverting input terminal of the first operational amplifier U1 is connected to the output terminal AD + of the signal selecting circuit through the first resistor R1, and the non-inverting input terminal of the first operational amplifier U1 is connected to the output terminal AD + of the signal selecting circuit through the second resistor R2. The inverting input terminal of the first operational amplifier U1 is connected to the output terminal of the first operational amplifier U1 through a third resistor R3 and a ninth capacitor C9, respectively, and the non-inverting input terminal of the first operational amplifier U1 is grounded through a fourth resistor R4 and a tenth capacitor C10. The output end of the first operational amplifier U1 is connected to the non-inverting input end of the second operational amplifier U2, and the non-inverting input end of the second operational amplifier U2 is further grounded through an eleventh capacitor C11. The inverting input end of the second operational amplifier U2 is connected to the output end of the second operational amplifier U2 through a fifth resistor R5, the output end of the second operational amplifier U2 is also grounded through a twelfth capacitor C12 and a seventh resistor R7, the output end of the second operational amplifier U2 is connected to the input pin (Vin pin) of the true effective value converter U0 through a sixth resistor R6, the output pin (Out pin) of the true effective value converter U0 is connected to the output end DETLD of the outgoing signal conversion circuit through an eighth resistor R8 and connected to the signal operation control circuit, and the true effective value converter U0 in the present application adopts AD 536. The input pin of the true effective value converter U0 is also connected with the anode of a fifth diode D5 and the cathode of a sixth diode D6, the cathode of the fifth diode D5 is connected with a direct current power supply + V50, and the anode of the sixth diode D6 is connected with a direct current power supply-V50. A fourteenth capacitor C14 is connected between a pin Cc and a pin Com of the true effective value converter U0, a sixteenth capacitor C16 is connected between a pin Out and a pin Cf, a pin Vs of the true effective value converter U0 is connected to a dc power supply-V50, a pin Cav of the true effective value converter U0 is connected to the dc power supply-V50 through a fifteenth capacitor C15, the pin Out of the true effective value converter U0 is further grounded through a ninth resistor R9, and an output terminal DETLD of the signal conversion circuit is further grounded through a seventeenth capacitor C17.
Optionally, the thunderbolt signal is not direct output for signal operation control circuit in this application, because the thunderbolt signal of sensing is an instantaneous pulse signal, its characteristics are that the time is short, and the electric current is big, therefore this application utilizes pulse signal to condition sampling circuit and adopts 20000: 1 to detect this lightning strike discharge process. The lightning stroke detection circuit also comprises a pulse signal conditioning and sampling circuit, wherein the input end of the pulse signal conditioning and sampling circuit is connected with a lightning stroke detection terminal of the alternating current filtering lightning protection leakage sampling circuit, and the output end of the pulse signal conditioning and sampling circuit is connected with a signal operation control circuit; the pulse signal conditioning and sampling circuit conditions and samples the lightning stroke signal output by the lightning stroke detection terminal of the alternating current filtering lightning protection leakage sampling circuit and outputs the conditioned and sampled lightning stroke signal to the signal operation control circuit.
The input end of the pulse signal conditioning and sampling circuit is connected with lightning stroke detection terminals LJ + and LJ-of the alternating current filtering lightning protection leakage sampling circuit, and the output end DETLJ is connected with the signal operation control circuit. Referring to the circuit diagram of the pulse signal conditioning sampling circuit shown in fig. 6, in the pulse signal conditioning sampling circuit, a first input terminal LJ + of the pulse signal conditioning sampling circuit is connected to a non-inverting input terminal of a third operational amplifier U3 through a tenth resistor R10 and a twelfth resistor R12, and a second input terminal LJ-of the pulse signal conditioning sampling circuit is grounded through a magnetic bead FB 1. An inverting input end of the third operational amplifier U3 is connected to an output end of the third operational amplifier U3 through a thirteenth resistor R13, a second transient suppression diode TVS2 and an eleventh resistor R11 are further respectively connected in parallel between the two input ends of the pulse signal conditioning and sampling circuit, and a first zener diode Z1 and an eighteenth capacitor C18 are further respectively connected in parallel between the first resistor R10 and the twelfth resistor R12; the non-inverting input terminal of the third operational amplifier U3 is further grounded through a second zener diode Z2 and a nineteenth capacitor C19, respectively, and the non-inverting input terminal of the third operational amplifier U3 is further connected to the operating power VCC through a seventh diode D7. The output end of the third operational amplifier U3 is further grounded through a twentieth capacitor C20, the output end of the third operational amplifier U3 is further connected to the non-inverting input end of the fourth operational amplifier U4 through a fourteenth resistor R14, the output end of the fourth operational amplifier U4 is connected to the non-inverting input end of the fifth operational amplifier U5 through a seventeenth resistor R17, the output end of the fourth operational amplifier U4 is further connected to a fifteenth resistor R15 and a sixteenth resistor R16 in sequence and grounded, the common end of the fifteenth resistor R15 and the sixteenth resistor R16 is connected to the inverting input end of the fourth operational amplifier U4, and the output end of the fourth operational amplifier U4 is further grounded through a twenty-first capacitor C21. The inverting input end of the fifth operational amplifier U5 is grounded through a nineteenth resistor R19 and a twenty-second capacitor C22 respectively, the inverting input end of the fifth operational amplifier U5 is further connected with a direct-current power supply + V50 through an eighteenth resistor, the output end of the fifth operational amplifier U5 is led out of the output end DETLJ of the pulse signal conditioning sampling circuit and is connected with a signal operation control circuit, and the output end of the fifth operational amplifier U5 is further grounded through a twentieth resistor R20 and a twenty-third capacitor C23 respectively. The third operational amplifier U3, the fourth operational amplifier U4, and the fifth operational amplifier U5 are respectively implemented by three channels in the four operational amplification chip LM 324.
Referring to fig. 7, the signal operation control circuit in the present application is based on a main control chip with a model number of STC15W401AS-35C-SOP20, a 13 th pin of the main control chip is connected to an output terminal DETLJ of the pulse signal conditioning and sampling circuit, a 20 th pin of the main control chip is connected to an output terminal DETLD of the signal conversion circuit, and a 17 th pin of the main control chip is further connected to a buzzer B1 through a triode Q5. And a 3 rd pin CTRL of the main control chip is connected with an output control driving circuit. The 11 th pin (RXD) and the 12 th pin (TXD) of the main control chip are also led out of a connector J3 to be used as communication reserved terminals for debugging.
Referring to a circuit diagram of the output control driving circuit shown in fig. 8, in the output control driving circuit, an emitter of a PNP-type first triode Q1 is connected to a working power VCC, a base CTRL is connected to a signal operation control circuit, a twenty-second resistor R22 is further connected between the emitter and the base of the first triode Q1, a collector of the first triode Q1 is connected to a positive input terminal of a first optocoupler P1 through a twenty-third resistor R23, a power supply pin of a voltage NPN 3 is connected to the working power VCC through a twenty-first resistor R21, a reset pin is connected to a base of a second triode Q2, an emitter of the second triode Q2 is grounded, and a collector of the second triode Q2 is connected to a negative input terminal of the first optocoupler P1. The output end of the first optocoupler P1 is connected with the bases of a PNP-type third triode Q3 and a PNP-type fourth triode Q4 respectively, the emitter of the third triode Q3 is connected with a power supply V12, the collector of the third triode Q3 is connected with a first relay K1, a first load switch controlled by the first relay is connected on a power supply path between a live wire FACL of alternating current and the anode of road traffic equipment, and the 1 st pin of a connector J2 in fig. 8 is led out to be connected with the anode of the road traffic equipment. An emitter of the fourth triode Q4 is connected with a power supply V12, a collector is connected with a second relay K2, and a second load switch controlled by the second relay is connected to a power supply path between a zero line of alternating current and a negative pole of road traffic equipment, for example, a 2 nd pin of a connector J2 in fig. 8 is led out to be connected with the negative pole of the road traffic equipment. The NPN type triode adopts SS8050, the PNP type triode adopts SS8550, and the voltage monitor T3 adopts CAT803SN500T 1G.
In the application, the road traffic system further comprises an alternating current-direct current conversion circuit, wherein the alternating current-direct current conversion circuit is used for converting alternating current into +/-5V direct current power and supplying the direct current power to each circuit to provide stable direct current required by the circuit to work. Referring to the circuit diagram shown in fig. 9, in the ac/dc converting circuit, one end of the primary coil of the transformer VT1 is led out of one ac input end of the ac/dc converting circuit through the second negative temperature coefficient resistor TR2 to be connected to the live line FACL of the ac power, the other end of the primary coil of the transformer VT1 is led out of the other ac input end of the ac/dc converting circuit to be connected to the neutral line FACN of the ac power, and the eighth varistor RV8 is further connected between two ends of the primary coil of the transformer VT 1. A third transient suppression diode TVS3 is connected between two ends of the secondary winding of the transformer VT1, one end of the secondary winding of the transformer VT1 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the other end of the secondary winding of the transformer VT1, one end of the secondary winding of the transformer VT1 is also connected to the anode of the second diode D2, the cathode of the second diode D2 is also connected to the cathode of the fourth diode D4, and the operation of the fourth diode D4 is also connected to the other end of the secondary winding of the transformer VT 1. A common terminal of the second diode D2 and the fourth diode D4 is connected to an input terminal of the first power chip T1 through an eleventh diode D11, a common terminal of the first diode D1 and the third diode D3 is grounded, an anode of the fourth diode D4 is grounded through a fourth electrolytic capacitor C4, and a cathode thereof is grounded through a fifth electrolytic capacitor C5; the output end of the first power chip T1 is connected with the input end of the second power chip T2, the output end of the first power chip T1 is grounded through a sixth electrolytic capacitor C6, and the output end of the second power chip T2 is led out of a direct current power supply + V50 and-V50 to be connected with other circuits for supplying power. The model of the first power chip T1 in this application is LM7805, and the model of the second power chip T2 is E0505S-2WR 3.
Based on the circuit structure disclosed in the application, the alternating current filtering lightning protection electric leakage sampling circuit firstly carries out tertiary lightning protection filtering to the alternating current of input, has certain inhibiting effect to common mode surge simultaneously to filter the interference signal who brings in the electric wire netting, the alternating current of the live wire of alternating current and zero line input can effectively protect subsequent load after the above-mentioned orderly layer upon layer processing of alternating current filtering lightning protection electric leakage sampling circuit, avoids the impact that the electric wire netting brought. Meanwhile, the alternating current filtering lightning protection leakage sampling circuit leads out lightning stroke detection terminals LJ + and LJ-to provide lightning stroke signals for a rear-stage circuit, and leads out leakage current detection terminals LL-and LL + to provide lightning stroke signals for the rear-stage circuit, so that if lightning stroke occurs or the load has electric leakage, the alternating current filtering lightning protection leakage sampling circuit can transmit the detected signals to a rear circuit for processing, and the lightning stroke and the electric leakage can be detected in real time through the two detection terminals. The voltage and current sampling circuit converts the input alternating current voltage and current into small signals with certain coefficients by using a highly reliable Hall element, and outputs voltage signals DV-, DV + and output current signals DL-, DL +. The signal selection circuit selects three groups of input DV-and DV +, DL-and DL +, LL + and LL + in turn and outputs the selected signals to the effective value conversion circuit, and after one path is processed, the other path is switched to process the other path of signals, so that the three paths of signals are processed in a circulating way, and the digital control analog switch can completely isolate the three paths of signals and prevent the three paths of signals from influencing each other. The effective value conversion circuit amplifies the signal input by the signal selection circuit through a differential operational amplifier, then increases input impedance through a voltage follower to reduce output impedance, and finally converts an analog signal into an equivalent direct current level signal through a true effective value converter to be output, and the direct current level signal can be provided for a subsequent signal operation control circuit to be sampled.
Pulse signal conditions sampling circuit and connects exchange filtering lightning protection electric leakage sampling circuit's thunderbolt detection terminal LJ + and LJ-, but because the thunderbolt signal of sensing is an instantaneous pulse signal, its characteristics are that the time is short, and the electric current is big, therefore this application utilizes pulse signal to condition sampling circuit and adopts 20000: 1 to detect this lightning strike discharge process. The induced signal passes through multi-layer amplitude limiting, and the current limiting network controls the signal in a safe range; the duration of the pulse signal is then lengthened to the order of seconds by a capacitor and a voltage follower, and finally the signal is changed into a +5V level signal (the signal only needs to be sampled or not) by an operational amplifier (aiming at the smaller lightning strike or electrostatic induction) and a voltage comparator, and the signal can be detected by a subsequent signal operation control circuit and has time to be processed. And finally, the signal operation control circuit performs AD conversion on the input analog signals DETLD and DETLJ to obtain real voltage, current and leakage current, detects whether lightning strike exists or not, and operates the signals to make control output, such as alarming through a buzzer and a light emitting diode, uploading data, controlling the on-off of a load switch through an output control driving circuit and the like. Because the driving current ratio of the CTRL signal output to the output control driving circuit by the signal operation control circuit is small and the voltage is low, if the relay is controlled, the signal needs to be amplified, and the driving voltage and the driving current of the signal can be improved to meet the requirement; the circuit is provided with two relays which respectively control an alternating current live wire and a zero line to provide a high-voltage alternating current power supply for a load, so that when the input power supply is unstable, or lightning strikes exist, the alternating current input of the load can be disconnected, and equipment is protected from being damaged.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (10)
1. A road traffic system with alternating current monitoring and protection functions, characterized in that the road traffic system comprises: the lightning protection leakage detection circuit comprises an alternating current filtering lightning protection leakage sampling circuit, a voltage and current sampling circuit, a signal conversion circuit, a signal operation control circuit and an output control driving circuit;
the alternating current filtering lightning protection leakage sampling circuit is characterized in that a sampling input end of the alternating current filtering lightning protection leakage sampling circuit is connected with alternating current for sampling, the alternating current filtering lightning protection leakage sampling circuit leads out a lightning stroke detection terminal, a leakage current detection terminal and a sampling output end, the alternating current filtering circuit outputs a lightning stroke signal through the lightning stroke detection terminal when lightning stroke is sensed based on the sampled alternating current, and outputs a leakage current signal through the leakage current detection terminal when leakage is detected;
the voltage sampling input end of the voltage and current sampling circuit is connected with the alternating current, the current sampling input end of the voltage and current sampling circuit is connected with the sampling output end of the alternating current filtering lightning protection leakage sampling circuit, and the voltage and current sampling circuit is led out of a voltage sampling output end output and a current sampling output end;
the signal conversion circuit converts one of three signals of a leakage current detection terminal of the alternating current filtering lightning protection leakage sampling circuit, a voltage sampling output end of the voltage current sampling circuit and a current sampling output end of the voltage current sampling circuit and outputs the converted signal to the signal operation control circuit;
the signal operation control circuit controls the state of a load switch according to the lightning strike signal and the signal output by the pulse signal conditioning and sampling circuit, and the load switch is connected to a power supply path from alternating current to road traffic equipment.
2. The road traffic system of claim 1, wherein a lightning strike sensing circuit and a surge suppression circuit are sequentially arranged in the ac filtering lightning protection leakage sampling circuit from a sampling input end to a sampling output end, the lightning strike sensing circuit leads out the lightning strike detection terminal, and the surge suppression circuit leads out the leakage current detection terminal and the sampling output end of the ac filtering lightning protection leakage sampling circuit.
3. The road traffic system according to claim 2, wherein the lightning strike sensing circuit in the AC filtering lightning leakage sampling circuit comprises a first voltage dependent resistor, a second voltage dependent resistor, a third voltage dependent resistor, a fourth voltage dependent resistor, a first temperature fuse, a second temperature fuse, a third temperature fuse, a first gas discharge tube, a second gas discharge tube, a third gas discharge tube and a first Hall sensor, one end of the series circuit formed by the first voltage dependent resistor, the first temperature fuse and the first gas discharge tube is connected with the live wire of the AC power, the other end of the series circuit formed by the second voltage dependent resistor, the second temperature fuse and the second gas discharge tube is connected with the second input end of the first Hall sensor, one end of the series circuit formed by the second voltage dependent resistor, the second temperature fuse and the second gas discharge tube is connected with the neutral wire of the AC power, and the other end of the series circuit formed by the second voltage dependent resistor, the second temperature fuse and the, the live wire of alternating current still connects the zero line of alternating current through third piezo-resistor and fourth piezo-resistor, and third temperature fuse, third gas discharge tube and be connected to first hall sensor's second input end are connected in proper order to third piezo-resistor and fourth piezo-resistor's common end, first hall sensor's first input ground connection, first hall sensor's first induction end and second induction end are drawn forth respectively lightning stroke detection terminal.
4. The road traffic system according to claim 3, wherein the surge suppression circuit in the AC filtering lightning protection leakage sampling circuit comprises a first inductor, a second inductor, a fifth piezoresistor, a sixth piezoresistor, a seventh piezoresistor, a fourth temperature fuse, a fifth temperature fuse, a sixth temperature fuse, a fourth gas discharge tube, a common-mode inductor, a first transient suppression diode, a first capacitor, a second capacitor, a third capacitor, a slow fuse, a first negative temperature coefficient resistor and a second Hall sensor;
the dotted end of the first winding of the common-mode inductor is connected with a live wire of alternating current through the first inductor, the dotted end of the second winding of the common-mode inductor is connected with a zero line of alternating current through the second inductor, the dotted end of the first winding of the common-mode inductor is further connected to the dotted end of the second winding of the common-mode inductor sequentially through the fifth piezoresistor and the fourth temperature fuse, and the dotted end of the first winding of the common-mode inductor is further connected to the dotted end of the second winding of the common-mode inductor sequentially through the sixth piezoresistor and the seventh piezoresistor; the common end of the sixth piezoresistor and the common end of the seventh piezoresistor are sequentially connected with the fifth temperature fuse and the fourth gas discharge tube and connected with the second input end of the first Hall sensor;
the synonym end of the first winding of the common-mode inductor is connected with the first input end of the second Hall sensor through the slow-melting fuse, and the synonym end of the second winding of the common-mode inductor is connected with the second input end of the second Hall sensor through the first negative temperature coefficient resistor; the synonym end of the first winding of the common mode inductor is also sequentially connected with the first transient suppression diode and the sixth temperature fuse and connected with the synonym end of the second winding of the common mode inductor, and the synonym end of the first winding of the common mode inductor is also connected with the synonym end of the second winding of the common mode inductor through the third capacitor; the synonym end of the first winding of the common-mode inductor is also connected with the second input end of the first Hall sensor through the second capacitor, and the synonym end of the second winding of the common-mode inductor is also connected with the second input end of the first Hall sensor through the first capacitor;
the first output end and the second output end of the second Hall sensor are led out of the sampling output end of the alternating current filtering lightning and leakage protection sampling circuit, the first output end of the second Hall sensor is communicated with the first input end, the second output end of the second Hall sensor is communicated with the second input end, and the first sensing end and the second sensing end of the second Hall sensor are led out of the leakage current detection terminal.
5. The road traffic system according to claim 1, further comprising a pulse signal conditioning and sampling circuit, wherein the input end of the pulse signal conditioning and sampling circuit is connected with the lightning stroke detection terminal of the alternating current filtering lightning protection leakage sampling circuit, and the output end of the pulse signal conditioning and sampling circuit is connected with the signal operation control circuit; and the pulse signal conditioning and sampling circuit conditions and samples the lightning stroke signal output by the lightning stroke detection terminal of the alternating current filtering lightning protection leakage sampling circuit and outputs the conditioned and sampled lightning stroke signal to the signal operation control circuit.
6. The road traffic system according to claim 5, wherein in the pulse signal conditioning and sampling circuit, a first input end of the pulse signal conditioning and sampling circuit is connected with a non-inverting input end of a third operational amplifier through a tenth resistor and a twelfth resistor, and a second input end of the pulse signal conditioning and sampling circuit is grounded through a magnetic bead; the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier through a thirteenth resistor, a second transient suppression diode and an eleventh resistor are respectively connected between the two input ends of the pulse signal conditioning and sampling circuit in parallel, and a first zener diode and an eighteenth capacitor are respectively connected between the first resistor and the twelfth resistor in parallel; the non-inverting input end of the third operational amplifier is grounded through a second Zener diode and a nineteenth capacitor respectively, and the non-inverting input end of the third operational amplifier is connected with a working power supply through a seventh diode;
the output end of the third operational amplifier is further grounded through a twentieth capacitor, the output end of the third operational amplifier is further connected with the non-inverting input end of a fourth operational amplifier through a fourteenth resistor, the output end of the fourth operational amplifier is connected with the non-inverting input end of a fifth operational amplifier through a seventeenth resistor, the output end of the fourth operational amplifier is further sequentially connected with a fifteenth resistor and a sixteenth resistor and grounded, the common end of the fifteenth resistor and the sixteenth resistor is connected with the inverting input end of the fourth operational amplifier, and the output end of the fourth operational amplifier is further grounded through a twenty-first capacitor;
the inverting input end of the fifth operational amplifier is grounded through a nineteenth resistor and a twenty-second capacitor respectively, the inverting input end of the fifth operational amplifier is further connected with a direct-current power supply through an eighteenth resistor, the output end of the fifth operational amplifier leads out the output end of the pulse signal conditioning and sampling circuit to be connected with the signal operational control circuit, and the output end of the fifth operational amplifier is grounded through a twentieth resistor and a twenty-third capacitor respectively.
7. The road traffic system according to claim 1, wherein the signal conversion circuit comprises a signal selection circuit and an effective value conversion circuit, the signal selection circuit is implemented based on a multi-channel digital control analog switch, three groups of input terminals of the signal selection circuit are respectively connected with the leakage current detection terminal of the ac filtering lightning protection leakage current sampling circuit, the voltage sampling output terminal and the current sampling output terminal of the voltage and current sampling circuit, the output terminal of the signal selection circuit is connected with the input terminal of the effective value conversion circuit, the effective value conversion circuit is implemented based on an amplification circuit and a true effective value converter, and the output terminal of the effective value conversion circuit is connected with the signal operation control circuit.
8. The road traffic system according to claim 7, characterized in that the signal selection circuit is implemented on the basis of a digitally controlled analog switch of CD4052 and the significance conversion circuit is implemented on the basis of a true significance converter of AD 536;
in the effective value conversion circuit, two input ends of a first operational amplifier are respectively connected with the output end of the signal selection circuit through a first resistor and a second resistor, an inverting input end of the first operational amplifier is respectively connected with the output end of the first operational amplifier through a third resistor and a ninth capacitor, and a non-inverting input end of the first operational amplifier is grounded through a fourth resistor and a tenth capacitor; the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier, and the non-inverting input end of the second operational amplifier is grounded through an eleventh capacitor; the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier through a fifth resistor, the output end of the second operational amplifier is grounded through a twelfth capacitor and a seventh resistor respectively, the output end of the second operational amplifier is connected with the input pin of the true effective value converter through a sixth resistor, and the output pin of the true effective value converter is connected with the signal operation control circuit through an eighth resistor to lead out the output end of the signal conversion circuit.
9. The road traffic system according to any one of claims 1 to 8, wherein the road traffic system further comprises an ac-dc conversion circuit, in the ac-dc conversion circuit, one end of a primary coil of a transformer leads out one ac input end of the ac-dc conversion circuit through a second negative temperature coefficient resistor to be connected with a live line of alternating current, the other end of the primary coil of the transformer leads out the other ac input end of the ac-dc conversion circuit to be connected with a neutral line of alternating current, and an eighth voltage dependent resistor is further connected between two ends of the primary coil of the transformer;
a third transient suppression diode is connected between two ends of a secondary coil of the transformer, one end of the secondary coil of the transformer is connected with a cathode of a first diode, an anode of the first diode is connected with an anode of a third diode, a cathode of the third diode is connected with the other end of the secondary coil of the transformer, one end of the secondary coil of the transformer is also connected with an anode of a second diode, a cathode of the second diode is also connected with a cathode of a fourth diode, and a demonstration technology of the fourth diode is also connected with the other end of the secondary coil of the transformer;
the common end of the second diode and the common end of the fourth diode are connected with the input end of the first power supply chip through an eleventh diode, the common end of the first diode and the common end of the third diode are grounded, the anode of the fourth diode is grounded through a fourth electrolytic capacitor, and the cathode of the fourth diode is grounded through a fifth electrolytic capacitor; the output end of the first power supply chip is connected with the input end of the second power supply chip, the output end of the first power supply chip is grounded through a sixth electrolytic capacitor, and the output end of the second power supply chip is led out to be connected with other circuits for power supply.
10. The road traffic system according to any one of claims 1 to 8, wherein in the voltage and current sampling circuit, two input terminals of a third hall sensor respectively lead out a current sampling input terminal of the voltage and current sampling circuit to be connected with a sampling output terminal of the alternating current filtering lightning protection leakage sampling circuit, an output terminal of the third hall sensor leads out a current sampling output terminal of the voltage and current sampling circuit, and a forty-third resistor and a forty-first capacitor are further connected between the two current sampling output terminals of the voltage and current sampling circuit;
the first input end of the fourth Hall sensor is led out through an eleventh resistor and a forty-th resistor, a voltage sampling input end of the voltage and current sampling circuit is connected with the live wire of the alternating current, the second input end of the fourth Hall sensor is led out, another voltage sampling input end of the voltage and current sampling circuit is connected with the zero line of the alternating current, two output ends of the fourth Hall sensor are led out, a voltage sampling output end of the voltage and current sampling circuit is connected with a forty-second resistor and a forty-fourth capacitor between the two voltage sampling output ends of the voltage and current sampling circuit.
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| CN202011607791.6A CN112798981A (en) | 2020-12-29 | 2020-12-29 | Road traffic system with alternating current monitoring and protecting functions |
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Cited By (1)
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| CN115149953A (en) * | 2022-08-30 | 2022-10-04 | 青岛鼎信通讯股份有限公司 | Low-frequency carrier signal sampling circuit based on operational amplifier |
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Application publication date: 20210514 |