CN111845850B - Subway track monitoring circuit - Google Patents
Subway track monitoring circuit Download PDFInfo
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- CN111845850B CN111845850B CN202010738605.6A CN202010738605A CN111845850B CN 111845850 B CN111845850 B CN 111845850B CN 202010738605 A CN202010738605 A CN 202010738605A CN 111845850 B CN111845850 B CN 111845850B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/18—Railway track circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/18—Railway track circuits
- B61L1/181—Details
Abstract
The invention discloses a subway track monitoring circuit, which effectively solves the problems of train speed limitation and poor anti-interference capability when a magnetoelectric sensor is used for track monitoring.
Description
Technical Field
The invention relates to the field of monitoring circuits, in particular to a subway rail monitoring circuit.
Background
The subway is a rapid, large-traffic and electric power traction rail transit built in cities, trains run on a fully-closed subway rail, lines in a central urban area are basically arranged in underground tunnels, lines outside the central urban area are generally arranged on viaducts or the ground, and the subway is a special, high-density and high-traffic urban rail transit system covering various underground and ground rights of roads in the urban area.
In the prior art, a magnetoelectric sensor is generally used when a train passes through a track, the magnetoelectric sensor converts kinetic energy of the train into induced potential in a coil to be output by utilizing an electromagnetic induction principle, but the magnetoelectric sensor is only suitable for dynamic measurement and has the following defects: firstly, the amplitude of the output signal changes along with the change of the rotating speed of the wheels of the train, and if the speed of the train is too slow, the output signal is too low, and the electric control unit cannot monitor the output signal; secondly, the response frequency is not high, and when the rotating speed of the train wheels is too high, the frequency response of the sensor cannot keep up; thirdly, the anti-electromagnetic wave interference ability is poor.
The present invention proposes a new solution to this problem.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide a subway rail monitoring circuit, which effectively solves the problems of train speed limitation and poor anti-interference capability when a magnetoelectric sensor is used for rail monitoring.
The technical scheme includes that the train protection device comprises a current transformer and a differentiator, the current transformer is short-circuited when a train passes through, a signal passing through the train is transmitted to a NAND gate through a bridge rectifier, an output signal of the NAND gate is transmitted to the differentiator, the differentiator sends a trigger signal to a trigger, the trigger changes the state and transmits the signal to the NAND gate, and the output signal of the NAND gate is transmitted to a controller or an alarm device through a relay.
Due to the adoption of the technology, compared with the prior art, the invention has the following advantages: whether use current transformer T1 and current transformer T2 to be monitored the subway track by the short circuit and whether have the train to pass through, no matter what kind of speed the train is in can both carry out effectual monitoring to the train, provide trigger signal for trigger T3 and trigger T4 through differentiator U3, make it the train pass through a current transformer when the trigger state can only alternate once, the effectual interference killing feature that has improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a simulation diagram of a subway train.
Fig. 3 is a timing diagram illustrating the operation of the present invention.
Detailed Description
The foregoing and other technical matters, effects and features of the present invention will be apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which reference is made to the accompanying drawings.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A ground rail monitoring circuit comprises an audio emitter AF, wherein a pin 1 of the audio emitter AF is connected with a rail 1, a pin 2 of the audio emitter AF is connected with a rail 2, an inductor L1 and a capacitor C1 are connected in series to form a series resonant circuit to connect the rail 1 and the rail 2, an inductor L2 and a capacitor C2 are connected in series to form a series resonant circuit to connect the rail 1 and the rail 2, the connection point of the audio emitter AF with the rail 1 and the rail 2 is located at the midpoint of the two series resonant circuits, an output signal of the audio emitter AF is output to the rail 1 from the pin 1, one path of the output signal is transmitted to the rail 2 through the series resonant circuit formed by the inductor L1 and the capacitor C1 and then returned to the pin 2 of the audio emitter AF, the other path of the output signal is transmitted to the rail 2 through the series resonant circuit formed by the inductor L2 and the capacitor C2 and then returned to the pin 2 of the audio emitter AF, the resonant frequencies of the two series resonant circuits are set as the frequencies of the output signal of the audio emitter AF, the 1 pin and the 2 pin of the current transformer T1 are respectively connected with two ends of a connector R1, the 1 pin and the 2 pin of the current transformer T2 are respectively connected with two ends of a connector R2, the connector R1 and the connector R2 are insulated, a signal on a track 1 passes through primary windings of the current transformer T1 and the current transformer T2, voltage signals output by secondary windings of the current transformer T1 and the current transformer T2 are respectively transmitted to a bridge rectifier D1 and a bridge rectifier D2, the bridge rectifier D1 and the bridge rectifier D2 output high-level signals, an AND gate U1 and a NOT gate U2 form a NAND gate, the output end of the NOT gate U2 outputs low level when two input ends simultaneously input high level, the output end of the NOT gate U2 outputs high level when any one of the two input ends inputs low level, the NOT gate U2 outputs the signal to a differentiator U3, and the differentiator U3 differentiates the signal in the process of changing from low level to high level and high level, respectively generating a positive differential signal and a negative differential signal, wherein the positive differential signal is output to a trigger T3 through a pin 2 of a differentiator U3, the negative differential signal is output to a trigger T4 through a pin 3 of a differentiator U3, the state of the output signal is changed by the trigger T3 and a trigger T4 after receiving the trigger signal, the output ends of a trigger T3 and a trigger T4 are respectively connected with a pin 1 and a pin 2 of an AND gate U4, the AND gate U4 and a NOT gate U5 form a NAND gate, the output end of the NOT gate U5 outputs low level when both input ends of the AND gate U4 input high level, the NOT gate U5 outputs high level when any input end of the AND gate U4 inputs low level, the output signal of the NOT gate U5 is output to a controller or an alarm device through a relay, when no train passes through the track, the primary windings of a current transformer T1 and the current transformer T2 are energized, the bridge rectifier D1 and the bridge rectifier D2 both output a high level, so that the and gate U1 outputs a high level, the not gate U2 outputs a low level, since the current through the primary windings of the current transformer T1 and the current transformer T2 is constant, the U2 continuously outputs a low level, the differentiator U3 does not output a signal, the outputs of the flip-flop T3 and the flip-flop T4 also remain unchanged, the flip-flop T3 and the flip-flop T4 are preset to a high level, the output of the and gate U4 is a high level, the output of the not gate U5 is a low level, which indicates that no train passes through the track, when a pair of wheels of the train passes through the current transformer T1, the current transformer T1 is short-circuited by two wheels immediately before and after the train passes through the current transformer T1, the bridge rectifier D1 outputs a low level, the primary winding of the current transformer T1 is re-energized, the bridge rectifier D1 outputs a high level, so that the not gate U2 outputs a high pulse voltage during the process, the differentiator U3 differentiates the rising edge and the falling edge of the high voltage pulse, the differentiated signals are respectively output to the flip-flop T3 and the flip-flop T4 as trigger signals, the flip-flop T3 and the flip-flop T4 change states and output low levels successively, so that the not gate U5 outputs high levels, the signals are output to the controller or the alarm circuit through a relay to indicate that a train passes through, when the pair of wheels which pass through the current transformer T1 pass through the current transformer T2, the not gate U2 also outputs a high voltage pulse as the current transformer T1, the differentiator U3 differentiates the rising edge and the falling edge of the high voltage pulse respectively, the differentiated signals are respectively output to the flip-flop T3 and the flip-flop T4 as trigger signals, the flip-flop T3 and the flip-flop T4 change states and output high levels successively, so that the output of the not gate U5 changes low levels again, the audio frequency signal processing circuit comprises an audio frequency transmitter AF, a 1 pin of the audio frequency transmitter AF is connected with a track 1 between a connector R1 and a connector R2, a 2 pin of the audio frequency reflection area AF is connected with a track 2, a 1 pin of a current transformer T1 is connected with one end of a connector R1 in the track 1, a 2 pin of a current transformer T1 is connected with the other end of a connector R1 in the track 1, a 3 pin of a current transformer T1 is connected with a 1 pin of a bridge rectifier D1, a 4 pin of a current transformer T1 is connected with a 2 pin of a bridge rectifier D1, one end of an inductor L1 is connected with the track 1, the other end of an inductor L1 is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with the track 2, a 1 pin of a current transformer T2 is connected with one end of a connector R2 in the track 1, a 2 pin of a current transformer T2 is connected with the other end of a connector R2 in the track 1, a 3 pin of a current transformer T2 is connected with a 1 pin 493 2 of the bridge rectifier D2, and a 4 pin of a current transformer T2 is connected with a 2 pin 2, one end of an inductor L2 is connected with a track 1, the other end of the inductor L2 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with a track 2, a pin 3 of a bridge rectifier D1 is connected with a pin 1 of an AND gate U1, a pin 3 of a bridge rectifier D2 is connected with a pin 2 of an AND gate U1, an output end of the AND gate U1 is connected with an input end of an NOT gate U2, an output end of the NOT gate U2 is connected with a pin 1 of a differentiator U3, a pin 2 of the differentiator U3 is connected with a positive electrode of a diode D3, a pin 3 of the differentiator U3 is connected with a negative electrode of a diode D4, a negative electrode of a diode D3 is connected with an input end of a trigger T3, an output end of the trigger T3 is connected with a pin 1 of an AND gate U4, a positive electrode of a diode D4 is connected with an input end of a trigger T4, an output end of the trigger T4 is connected with a pin 2 of the AND gate U4, an output end of the NOT 4 is connected with an input end of the NOT 5, and an output end of the NOT 5 is connected with a relay.
When the invention is used, a signal sent by an audio transmitter AF passes through a current transformer TI and a primary winding of a current transformer T2, a bridge rectifier D1 and a bridge rectifier D2 output high level, a NOT gate U2 outputs low level, a differentiator U3 differentiates a changed voltage signal, when no train passes through the track, the primary windings of the current transformer T1 and the current transformer T2 are kept electrified, the output voltage of the NOT gate U2 is kept unchanged, the differentiator U3 does not output a signal, the states of a trigger T3 and a trigger T4 are kept unchanged, a trigger T3 and the trigger T4 are preset to be high level, therefore, the NOT gate U5 outputs low level to indicate that no train passes through the track, when the train passes through the track, when a pair of wheels of the train passes through the position above the current transformer T1, the primary winding of the current transformer T1 is firstly short-circuited, the primary winding of the current transformer T1 is cut off, the primary winding of the current transformer T1 is electrified again after the current transformer T1, therefore, the output voltage of the not gate U2 changes from low level to high level and then changes to low level, which is a high level pulse, the differentiator U3 differentiates the rising edge and the falling edge of the high level pulse, the differentiated signal is transmitted to the flip-flop T3 and the flip-flop T4 as a trigger signal, the flip-flop T3 and the flip-flop T4 change states and output low level, so that the not gate U4 outputs high level, which indicates that a train passes through, the wheel will first short the current transformer T2 when passing over the current transformer T2, the primary winding of the current transformer T2 is de-energized, and the primary winding of the current transformer T2 is energized again after passing through the current transformer T2, so that the output voltage of the not gate U2 changes from low level to high level and then changes to low level, which is a high level pulse, the differentiator U3 differentiates the rising edge and the falling edge of the high level pulse, the differentiated signals are respectively transmitted to a trigger T3 and a trigger T4 as trigger signals, the trigger T3 and the trigger T4 are enabled to change states and output high levels, the trigger T3 and the trigger T4 are enabled to reset, the distance between a current transformer T1 and a current transformer T2 is set as d0, the distance between a front wheel and a rear wheel of each pair of wheels of the train is set as d1, the distance d0 is preferably larger than the distance d1, and the signals are transmitted to a controller or an alarm device through a relay when a NOT gate U4 outputs high levels;
according to the invention, whether a train passes through a subway track is monitored through the short-circuit state of the current transformer T1 and the current transformer T2, and the train does not need to be limited by the running speed of the train, the differentiator U3 is used for providing trigger signals for the trigger T3 and the trigger T4, the trigger signal is only sent out once when the train passes through the current transformer T1 or the current transformer T2 each time, the trigger T3 and the trigger T4 do not change when the train passes through the current transformer T1 or the current transformer T2, and the anti-interference capability of the monitoring process is effectively improved.
Claims (1)
1. A subway rail monitoring circuit comprises a current transformer and a differentiator, and is characterized in that the current transformer is short-circuited when a train passes through, a signal passing through the train is transmitted to a NAND gate through a bridge rectifier, an output signal of the NAND gate is transmitted to the differentiator, the differentiator sends a trigger signal to a trigger, the trigger changes the state and transmits the signal to the NAND gate, and the output signal of the NAND gate is transmitted to a controller or an alarm device through a relay;
the subway track monitoring circuit comprises an audio transmitter AF, a 1 pin of the audio transmitter AF is connected with a track 1 between a connector R1 and a connector R2, a 2 pin of the audio reflection area AF is connected with a track 2, a 1 pin of a current transformer T1 is connected with one end of a connector R1 in the track 1, a 2 pin of a current transformer T1 is connected with the other end of a connector R1 in the track 1, a 3 pin of a current transformer T1 is connected with a 1 pin of a bridge rectifier D1, a 4 pin of a current transformer T1 is connected with a 2 pin of the bridge rectifier D1, one end of an inductor L1 is connected with the track 1, the other end of an inductor L1 is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with the track 2, a 1 pin of a current transformer T2 is connected with one end of a connector R2 in the track 1, a 2 pin of a current transformer T2 is connected with the other end of a connector R2 in the track 1, and a 3 pin of a current transformer T2 is connected with a 1 pin of the bridge rectifier D2, a pin 4 of the current transformer T2 is connected to a pin 2 of the bridge rectifier D2, one end of the inductor L2 is connected to the rail 1, the other end of the inductor L2 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the rail 2, a pin 3 of the bridge rectifier D1 is connected to a pin 1 of the and gate U1, a pin 3 of the bridge rectifier D2 is connected to a pin 2 of the and gate U1, an output of the and gate U1 is connected to an input of the not gate U2, an output of the not gate U2 is connected to a pin 1 of the differentiator U3, a pin 2 of the differentiator U3 is connected to an anode of the diode D3, a pin 3 of the differentiator U3 is connected to a cathode of the diode D3, a cathode of the diode D3 is connected to an input of the trigger T3, an output of the trigger T3 is connected to a pin 2 of the and gate U3, an output of the and gate U3 is connected to an input of the gate U3. The output end of the NOT gate U5 is connected with a relay.
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| CN202010738605.6A CN111845850B (en) | 2020-07-28 | 2020-07-28 | Subway track monitoring circuit |
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| CN202010738605.6A CN111845850B (en) | 2020-07-28 | 2020-07-28 | Subway track monitoring circuit |
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| CN111845850B true CN111845850B (en) | 2022-03-29 |
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| CN116534091B (en) * | 2023-07-06 | 2023-10-27 | 北京和利时系统工程有限公司 | Method for realizing adjacent line interference analysis, computer storage medium and terminal |
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