An insulated track circuit

Abstract

The application provides an insulated track circuit, each section of which comprises a sending side and a receiving side; the receiving side and the sending side each comprise a common mode inductance unit, a lightning protection transformer, a transmission cable, a matching transformer, a tuning unit and a transceiver; the transceiver is connected to the rail through the lightning protection transformer, the transmission cable, the common mode inductance unit and the matching transformer in sequence; the tuning unit is arranged between the two connecting points of the matching transformer and the rail; the tuning unit is located at the two ends of a mechanical insulation joint in the insulated track circuit; the tuning unit is used for generating series resonance on the signal of an adjacent section to form short-circuit impedance close to zero and generating parallel resonance on the signal of the section to form high impedance; the transmission cable presents capacitive transmission cable in the presence of a signal and inductive common mode inductance unit to form parallel resonance on the signal of the section to generate high impedance; thus, after a mechanical insulation joint appears a damage fault, the channel impedance is increased and the power of a track circuit transmitter is reduced, so that fault escalation is avoided.

Description

Technical Field

[0001] This invention belongs to the field of railway signaling technology, and more specifically, relates to an insulated track circuit. Background Technology

[0002] Track circuits are primarily used to check the track's occupancy and vacancy status, as well as to monitor the integrity of the rails, thus playing a crucial role in improving the safety and reliability of train operations. Track circuits are generally divided into sections using insulating joints. For sections between stations, electrical insulating joints are mainly used, while within stations, mechanical insulating joints are primarily used to achieve electrical separation of the track circuits.

[0003] This type of mechanical insulation provides good signal isolation, but it suffers from insulation damage. When the insulation breaks, the signal is transmitted outside the designated area, which reduces the load within the channel, increases the load burden on the track circuit transmitter, and reduces the safety and reliability of the track circuit system. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an insulated track circuit that, after a mechanical insulation joint fails, increases the channel impedance and reduces the power of the track circuit transmitter, thereby preventing the failure from escalating.

[0005] This application provides an insulated track circuit, comprising: multiple sections; each section includes: a transmitting side and a receiving side;

[0006] Both the transmitting and receiving sides include: a common-mode inductor unit, a surge protection transformer, a transmission cable, a matching transformer, a tuning unit, and a transceiver device;

[0007] The transceiver is connected to the rail in sequence via the lightning protection transformer, the transmission cable, the common-mode inductor unit, and the matching transformer; the tuning unit is located between the two connection points of the matching transformer and the rail; the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit; wherein, the transceiver on the transmitting side is a transmitting device; and the transceiver on the receiving side is a receiving device.

[0008] The tuning unit is used to generate series resonance to form a short circuit for signals in adjacent segments, with impedance approaching zero; and to generate parallel resonance to form high impedance for signals in the current segment.

[0009] The transmission cable exhibits capacitive behavior when a signal is present, and the inductive behavior of the transmission cable and the common-mode inductor unit forms a parallel resonance with the signal in this section, resulting in high impedance.

[0010] Optionally, in the above-described insulated track circuit, on the transmitting side: the transmitting device is connected to the primary winding of the lightning protection transformer;

[0011] The secondary winding of the lightning protection transformer is connected to one side of the transmission cable;

[0012] The other side of the transmission cable is connected to one side of the common-mode inductor unit;

[0013] The other side of the common-mode inductor unit is connected to the primary winding of the matching transformer;

[0014] The secondary winding of the matching transformer is connected to the rail;

[0015] The tuning unit is disposed between the two connection points of the matching transformer and the rail; and the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

[0016] Optionally, in the above-mentioned insulated track circuit, on the receiving side: the receiving device is connected to the primary winding of the lightning protection transformer;

[0017] The secondary winding of the lightning protection transformer is connected to one side of the transmission cable;

[0018] The other side of the transmission cable is connected to one side of the common-mode inductor unit;

[0019] The other side of the common-mode inductor unit is connected to the primary winding of the matching transformer;

[0020] The secondary winding of the matching transformer is connected to the rail;

[0021] The tuning unit is disposed between the two connection points of the matching transformer and the rail; and the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

[0022] Optionally, in the above-described insulated track circuit, the common-mode inductor unit includes a common-mode inductor.

[0023] Optionally, in the above-described insulated track circuit, the common-mode inductor unit includes a first branch and a second branch;

[0024] One end of the first branch is connected to one end of one side of the transmission cable;

[0025] One end of the second branch is connected to the other end of one side of the transmission cable.

[0026] The other end of the first branch is connected to one end of the primary winding of the matching transformer;

[0027] The other end of the second branch is connected to the other end of the primary winding of the matching transformer.

[0028] Optionally, in the above-described insulated track circuit, the common-mode inductor unit includes: at least one first inductor and at least one second inductor;

[0029] The first inductor is installed on the first branch;

[0030] The second inductor is provided on the second branch.

[0031] Optionally, in the above-described insulated track circuit, the number of the first inductors is one.

[0032] The number of the second inductor is 1.

[0033] Optionally, in the above-mentioned insulated track circuit, the signal frequencies of two adjacent sections are different.

[0034] Optionally, in the above-mentioned insulated track circuit, the signal frequencies of two segments spaced one section apart are the same.

[0035] Optionally, in the above-mentioned insulated track circuit, when insulation failure occurs, the mechanical insulation joints of the corresponding two sections fail, forming a circuit;

[0036] The first signal from the first segment enters the second segment; the tuning unit on the receiving side in the second segment resonates in series with the first signal, forming zero impedance;

[0037] The tuning unit on the receiving side of the first segment is connected in parallel with the tuning unit on the receiving side of the second segment; the impedance is less than the threshold.

[0038] After passing through the matching transformer, the impedance is less than the threshold, and the common-mode inductor unit and the transmission cable resonate in parallel.

[0039] As can be seen from the above technical solution, the insulated track circuit provided by the present invention includes multiple sections, each section including a transmitting side and a receiving side; both the receiving side and the transmitting side include: a common-mode inductor unit, a lightning protection transformer, a transmission cable, a matching transformer, a tuning unit, and a transceiver device; the transceiver device is connected to the rail in sequence through the lightning protection transformer, the transmission cable, the common-mode inductor unit, and the matching transformer; the tuning unit is located between the two connection points of the matching transformer and the rail; the tuning unit is located at both ends of the mechanical insulation joint in the insulated track circuit; wherein, the transceiver device on the transmitting side is a transmitting device; the transceiver device on the receiving side is a receiving device; the tuning unit is used to generate series resonance to form a short circuit for the signal of the adjacent section, with the impedance approaching zero; and to generate parallel resonance to form a high impedance for the signal of the current section; the transmission cable exhibits capacitive behavior when there is a signal, and the inductive behavior of the transmission cable and the common-mode inductor unit forms parallel resonance for the signal of the current section, generating a high impedance; thus, after the mechanical insulation joint is damaged, the channel impedance increases, the power of the track circuit transmitter is reduced, thereby preventing the fault from escalating. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of an insulated track circuit provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of another insulated track circuit provided in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of another insulated track circuit provided in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of another insulated track circuit provided in an embodiment of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] This application provides an insulated track circuit to solve the problem in the prior art where signal transmission across zones occurs due to insulation damage, which reduces the load within the channel, increases the load burden on the track circuit transmitter, and reduces the safety and reliability of the track circuit system.

[0048] See Figure 1The insulated track circuit includes: multiple sections; the sections include: a transmitting side and a receiving side.

[0049] See Figure 2 Both the transmitting and receiving sides include: a common-mode inductor unit, a surge protection transformer, a transmission cable, a matching transformer, a tuning unit, and a transceiver device;

[0050] The transceiver unit is connected to the rail in sequence via a lightning protection transformer, a transmission cable, a common-mode inductor unit, and a matching transformer.

[0051] The tuning unit is located between the two connection points of the matching transformer and the rail; the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

[0052] Among them, the transceiver device on the sending side is the transmitting device; the transceiver device on the receiving side is the receiving device.

[0053] For ease of explanation, each transformer and transmission cable will be given a distinct name.

[0054] The transmitting side includes a transmitting lightning protection transformer, a transmitting transmission cable, a transmitting common-mode inductor unit, a transmitting matching transformer, a transmitting tuning unit, and a transmitting device.

[0055] The transmitting device is connected to the rail sequentially via a transmitting lightning protection transformer, a transmitting transmission cable, a transmitting common-mode inductor unit, and a transmitting matching transformer. The transmitting tuning unit is located between the two connection points of the transmitting matching transformer and the rail; and is situated at both ends of the mechanical insulation joint in the insulated rail circuit.

[0056] Specifically, the transmitting device is connected to the primary winding of the transmitting surge protection transformer; the secondary winding of the transmitting surge protection transformer is connected to one end of the transmitting transmission cable; the other end of the transmitting transmission cable is connected to one end of the transmitting common mode inductor unit; the other end of the transmitting common mode inductor unit is connected to the primary winding of the transmitting matching transformer; one end of the primary winding of the transmitting matching transformer is connected to one end of the rail and one end of the transmitting tuning unit; the other end of the secondary winding of the transmitting matching transformer is connected to the other end of the rail and the other end of the transmitting tuning unit.

[0057] The receiving side includes a receiving lightning protection transformer, a receiving transmission cable, a receiving common-mode inductor unit, a receiving matching transformer, a receiving tuning unit, and a receiving device.

[0058] The receiving device is connected to the rail sequentially via a receiving lightning protection transformer, a receiving transmission cable, a receiving common-mode inductor unit, and a receiving matching transformer. The receiving tuning unit is located between the two connection points of the receiving matching transformer and the rail; and is situated at both ends of the mechanical insulation joint in the insulated rail circuit.

[0059] Specifically, the receiving device is connected to the primary winding of the receiving surge protection transformer; the secondary winding of the receiving surge protection transformer is connected to one end of the receiving transmission cable; the other end of the receiving transmission cable is connected to one end of the receiving common-mode inductor unit; the other end of the receiving common-mode inductor unit is connected to the primary winding of the receiving matching transformer; one end of the primary winding of the receiving matching transformer is connected to one end of the rail and one end of the receiving tuning unit; the other end of the secondary winding of the receiving matching transformer is connected to the other end of the rail and the other end of the receiving tuning unit.

[0060] The tuning unit is used to generate series resonance to form a short circuit for signals in adjacent segments, with impedance approaching zero; and to generate parallel resonance to form high impedance for signals in the current segment.

[0061] In other words, when insulation failure occurs between this section and the adjacent section, the mechanical insulation joint between this section and the corresponding adjacent section fails, forming a circuit.

[0062] At this time, the tuning unit and the corresponding signal in the corresponding section will resonate in series to form a short circuit, and will also resonate in parallel to the signal in the section to form a high impedance.

[0063] When a signal is present, the transmission cable exhibits capacitive behavior. The inductive properties of the transmission cable and the common-mode inductor unit create parallel resonance with the signal in this section, resulting in high impedance.

[0064] In other words, when a signal is transmitted on a transmission cable, the transmission cable exhibits capacitive behavior, meaning that the transmission cable can be considered equivalent to a capacitor.

[0065] That is, the capacitive property of the transmission cable and the inductive property of the common-mode inductor unit form a parallel resonance with the signal in this section, generating high impedance and preventing the signal from flowing out through insulation failure.

[0066] like Figure 2 As shown, the insulated track circuit with mechanical insulating joints includes three sections: section A, section B, and section C. The signal frequency of section A is f1, and the signal frequencies of sections B and C are f2. The basic structure of each section of the track circuit is the same, including: a receiving unit, a transmitting unit, a lightning protection transformer, and a matching transformer.

[0067] Tuning units are installed at both ends of the mechanical insulation joint, and common-mode inductor units are installed between the matching voltage transformer and the transmission cable.

[0068] The tuning unit in this section can generate series resonance to create a short circuit for signals in adjacent sections, with impedance approaching zero; while it can generate parallel resonance to create high impedance for signals in this section.

[0069] The design of the common-mode inductor unit is as follows: the transmission cable exhibits capacitive behavior when there is a signal, which can form a parallel resonance with the inductive behavior of the common-mode inductor L1 to generate high impedance for the signal in this section.

[0070] In other words, we should avoid signals from adjacent segments and also prevent signals from adjacent segments from flowing into our segment.

[0071] The specific implementation mechanism is as follows: When insulation failure occurs, the mechanical insulation joint between section A and section B fails, forming a circuit. Signal f1 from section A enters section B, and the tuning unit within section B resonates in series with f1, forming zero impedance, i.e., a short circuit occurs, so signal f1 cannot continue to be transmitted to section B. Since the tuning unit within section B forms zero impedance, the tuning unit on the receiving side of section A is connected in parallel with it, and its impedance approaches zero. After passing through the matching transformer, the impedance also approaches zero, so the common-mode inductor L1 and the transmission cable will resonate in parallel at a resonant frequency of f1. Parallel resonance increases the impedance within the channel. Increased channel impedance, under constant voltage source output conditions, reduces the transmitter output power, improving safety after a fault occurs.

[0072] The above example uses insulation failure between section A and section B. The mechanism is the same after insulation failure occurs between section A and section C, so it will not be elaborated here. It depends on the actual situation and is within the scope of protection of this application.

[0073] In this embodiment, the insulated track circuit includes multiple sections, each section including a transmitting side and a receiving side. Both the transmitting and receiving sides include a common-mode inductor unit, a surge protection transformer, a transmission cable, a matching transformer, a tuning unit, and a transceiver. The transceiver is connected to the rail sequentially through the surge protection transformer, the transmission cable, the common-mode inductor unit, and the matching transformer. The tuning unit is located between two connection points of the matching transformer and the rail. The tuning unit is located at both ends of the mechanical insulation joint in the insulated track circuit. The transceiver on the transmitting side is a transmitting device, and the transceiver on the receiving side is a receiving device. The tuning unit generates a series resonance to form a short circuit for signals from adjacent sections, resulting in impedance approaching zero. It also generates a parallel resonance to form a high impedance for signals from the current section. The transmission cable exhibits capacitive behavior when a signal is present, and the inductive behavior of the transmission cable and the common-mode inductor unit forms a parallel resonance with the signal from the current section, generating high impedance. Therefore, after a mechanical insulation joint failure, the channel impedance increases, reducing the power of the track circuit transmitter, thereby preventing the fault from escalating.

[0074] In practical applications, the specific connection relationship on the sending side is as follows:

[0075] On the transmitting side: the transmitting device is connected to the primary winding of the lightning protection transformer; the secondary winding of the lightning protection transformer is connected to one side of the transmission cable; the other side of the transmission cable is connected to one side of the common mode inductor unit; the other side of the common mode inductor unit is connected to the primary winding of the matching transformer; the secondary winding of the matching transformer is connected to the rail; the tuning unit is located between the two connection points of the matching transformer and the rail; and the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

[0076] That is, the transmitting device is connected to the primary winding of the transmitting surge protection transformer; the secondary winding of the transmitting surge protection transformer is connected to one end of the transmitting transmission cable; the other end of the transmitting transmission cable is connected to one end of the transmitting common-mode inductor unit; the other end of the transmitting common-mode inductor unit is connected to the primary winding of the transmitting matching transformer; one end of the primary winding of the transmitting matching transformer is connected to one end of the rail and one end of the transmitting tuning unit; the other end of the secondary winding of the transmitting matching transformer is connected to the other end of the rail and the other end of the transmitting tuning unit.

[0077] In practical applications, the specific connection relationship on the receiving side is as follows:

[0078] On the receiving side: the receiving device is connected to the primary winding of the lightning protection transformer; the secondary winding of the lightning protection transformer is connected to one side of the transmission cable; the other side of the transmission cable is connected to one side of the common mode inductor unit; the other side of the common mode inductor unit is connected to the primary winding of the matching transformer; the secondary winding of the matching transformer is connected to the rail; the tuning unit is located between the two connection points of the matching transformer and the rail; and the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

[0079] That is, the receiving device is connected to the primary winding of the receiving surge protection transformer; the secondary winding of the receiving surge protection transformer is connected to one end of the receiving transmission cable; the other end of the receiving transmission cable is connected to one end of the receiving common mode inductor unit; the other end of the receiving common mode inductor unit is connected to the primary winding of the receiving matching transformer; one end of the primary winding of the receiving matching transformer is connected to one end of the rail and one end of the receiving tuning unit; the other end of the secondary winding of the receiving matching transformer is connected to the other end of the rail and the other end of the receiving tuning unit.

[0080] In practical applications, see Figure 3 The common-mode inductor unit includes: common-mode inductor L1.

[0081] It should be noted that the common mode inductor L1 (Common mode Choke), also called a common mode choke, is commonly used in computer switching power supplies to filter common mode electromagnetic interference signals. In board design, the common mode inductor L1 also serves as an EMI filter, used to suppress the outward radiation of electromagnetic waves generated by high-speed signal lines.

[0082] In the filter circuit of common-mode inductor L1, La and Lb are the coils of common-mode inductor L1. These two coils are wound on the same iron core with the same number of turns and phase (wound in opposite directions). Thus, when normal current flows through common-mode inductor L1, the current generates opposite magnetic fields in the inductor coils wound in the same phase, which cancel each other out. At this time, the normal signal current is mainly affected by the coil resistance (and a small amount of damping due to leakage inductance). When common-mode current flows through the coil, due to the unidirectional nature of the common-mode current, a unidirectional magnetic field is generated in the coil, increasing the coil's inductive reactance and making the coil exhibit high impedance, producing a strong damping effect. This attenuates the common-mode current, achieving the purpose of filtering.

[0083] Specifically, the first end of the common mode inductor L1 is connected to one end of one side of the transmission cable; the second end of the common mode inductor L1 is connected to the other end of one side of the transmission cable; the third end of the common mode inductor L1 is connected to one end of the primary winding of the matching voltage transformer; and the fourth end of the common mode inductor L1 is connected to the other end of the primary winding of the matching voltage transformer.

[0084] In practical applications, the common-mode inductor unit includes a first branch and a second branch;

[0085] One end of the first branch is connected to one end of one side of the transmission cable; one end of the second branch is connected to the other end of one side of the transmission cable; the other end of the first branch is connected to one end of the primary winding of the matching transformer; the other end of the second branch is connected to the other end of the primary winding of the matching transformer.

[0086] In practical applications, see Figure 4 The common-mode inductor unit includes: at least one first inductor L2 and at least one second inductor L3;

[0087] The first inductor L2 is installed on the first branch.

[0088] In other words, one end of the first inductor L2 is connected to one end of the transmission cable; the other end of the first inductor L2 is connected to one end of the primary winding of the matching transformer.

[0089] A second inductor L3 is installed on the second branch.

[0090] In other words, one end of the second inductor L3 is connected to one side of the transmission cable and the other end of the transmission cable; the other end of the second inductor L3 is connected to the other end of the primary winding of the matching transformer.

[0091] In practical applications, there is one first inductor L2.

[0092] One end of the first inductor L2 is directly connected to one end of the transmission cable; the other end of the first inductor L2 is directly connected to one end of the primary winding of the matching transformer.

[0093] Of course, it is also possible that the number of the first inductor L2 is other values, which will not be elaborated here. It depends on the actual situation and is all within the protection scope of this application.

[0094] When there are multiple first inductors L2, each first inductor L2 is connected in series and / or in parallel.

[0095] Specifically, one end of each of the first inductors L2 connected in series serves as one end of the first branch and is connected to one end of the transmission cable; the other end of each of the first inductors L2 connected in series serves as the other end of the first branch and is connected to one end of the primary winding of the matching transformer.

[0096] Alternatively, one end of each of the first inductors L2 connected in parallel can serve as one end of the first branch and be connected to one end of the transmission cable; the other end of each of the first inductors L2 connected in parallel can serve as the other end of the first branch and be connected to one end of the primary winding of the matching transformer.

[0097] Alternatively, one end of the series-parallel connection of each first inductor L2 can serve as one end of the first branch and be connected to one end of the transmission cable; the other end of the series connection of each first inductor L2 can serve as the other end of the first branch and be connected to one end of the primary winding of the matching transformer.

[0098] The number of the second inductor L3 is 1.

[0099] One end of the second inductor L3 is directly connected to one side of the transmission cable and the other end; the other end of the second inductor L3 is directly connected to the other end of the primary winding of the matching transformer.

[0100] Of course, it is also possible that the number of the second inductor L3 is other values, which will not be elaborated here. It depends on the actual situation and is all within the protection scope of this application.

[0101] When there are multiple second inductors L3, each second inductor L3 is connected in series and / or in parallel.

[0102] Specifically, one end of each of the second inductors L3 connected in series serves as one end of the second branch and is connected to the other end of one side of the transmission cable; the other end of each of the second inductors L3 connected in series serves as the other end of the second branch and is connected to the other end of the primary winding of the matching transformer.

[0103] Alternatively, one end of each of the second inductors L3 connected in parallel serves as one end of the second branch and is connected to the other end of one side of the transmission cable; the other end of each of the second inductors L3 connected in parallel serves as the other end of the second branch and is connected to the other end of the primary winding of the matching transformer.

[0104] Alternatively, one end of each of the second inductors L3 connected in series and parallel can serve as one end of the second branch and be connected to the other end of one side of the transmission cable; the other end of each of the second inductors L3 connected in series can serve as the other end of the second branch and be connected to the other end of the primary winding of the matching transformer.

[0105] In practical applications, the signal frequencies of two adjacent segments are different.

[0106] The signal frequencies of two segments separated by one section are the same.

[0107] Specifically, such as Figure 4 As shown, the insulated track circuit includes three sections: section A, section B, and section C. The signal frequency of section A is f1, and the signal frequencies of sections B and C are f2.

[0108] In other words, the signal frequencies of segments B and C are equal; the signal frequency of segment A is not equal to the signal frequencies of segments B and C.

[0109] In practical applications, when insulation failure occurs, the mechanical insulation joints of the corresponding two sections fail, forming a circuit; the first signal from the first section enters the second section; the tuning unit on the receiving side in the second section resonates in series with the first signal, forming zero impedance; the tuning unit on the receiving side of the first section is connected in parallel with the tuning unit on the receiving side in the second section; the impedance is less than the threshold; after passing through the matching transformer, the impedance is less than the threshold, and the common-mode inductor L1 resonates in parallel with the transmission cable.

[0110] It should be noted that if the impedance is less than the threshold, it can be considered that the impedance is close to zero.

[0111] Specifically, the insulated track circuit with mechanical insulating joints comprises three sections: section A, section B, and section C. The signal frequency of section A is f1, and the signal frequencies of sections B and C are f2. The basic structure of each section of the track circuit is identical, including: a receiving unit, a transmitting unit, a lightning protection transformer, and a matching transformer.

[0112] Tuning units are installed at both ends of the mechanical insulation joint, and a common-mode inductor L1 is installed between the matching voltage transformer and the transmission cable.

[0113] The tuning unit in this section can generate series resonance to create a short circuit for signals in adjacent sections, with impedance approaching zero; while it can generate parallel resonance to create high impedance for signals in this section.

[0114] The design of the common-mode inductor L1 is as follows: when the transmission cable is in the presence of a signal, it exhibits capacitive behavior, which can form a parallel resonance with the inductive behavior of the common-mode inductor L1 to generate high impedance for the signal in this section.

[0115] In other words, we must prevent signals from flowing from this section to adjacent sections, and also prevent signals from flowing from adjacent sections to this section.

[0116] The specific implementation mechanism is as follows: When insulation failure occurs, the mechanical insulation joint between section A and section B fails, forming a circuit. Signal f1 from section A enters section B, and the tuning unit within section B resonates in series with f1, forming zero impedance, i.e., a short circuit occurs, so signal f1 cannot continue to be transmitted to section B. Since the tuning unit within section B forms zero impedance, the tuning unit on the receiving side of section A is connected in parallel with it, and its impedance approaches zero. After passing through the matching transformer, the impedance also approaches zero, so the common-mode inductor L1 and the transmission cable will resonate in parallel at a resonant frequency of f1. Parallel resonance increases the impedance within the channel. Increased channel impedance, under constant voltage source output conditions, reduces the transmitter output power, improving safety after a fault occurs.

[0117] The above example uses insulation failure between section A and section B. The mechanism is the same after insulation failure occurs between section A and section C, so it will not be elaborated here. It depends on the actual situation and is within the scope of protection of this application.

[0118] In this embodiment, tuning units are installed at both ends of the mechanical insulation joint, and a common-mode inductor L1 is installed at a suitable position in the channel to improve protection. This method is simple, effective, and highly reliable.

[0119] The features described in the various embodiments of this specification can be substituted for or combined with each other. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0120] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0121] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An insulated track circuit, characterized in that, include: Multiple sections; The segment includes: the transmitting side and the receiving side; Both the transmitting side and the receiving side include: a common-mode inductor unit, a lightning protection transformer, a transmission cable, a matching transformer, a tuning unit, and a transceiver device; The transceiver is connected to the rail in sequence via the lightning protection transformer, the transmission cable, the common-mode inductor unit, and the matching transformer; the tuning unit is located between the two connection points of the matching transformer and the rail; the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit; wherein, the transceiver on the transmitting side is a transmitting device; and the transceiver on the receiving side is a receiving device. The tuning unit is used to generate series resonance to form a short circuit for signals in adjacent segments, with impedance approaching zero; and to generate parallel resonance to form high impedance for signals in the current segment. The transmission cable exhibits capacitive behavior when a signal is present, and the inductive behavior of the transmission cable and the common-mode inductor unit forms a parallel resonance with the signal in this section, resulting in high impedance. When insulation failure occurs, the mechanical insulation joints of the corresponding two sections fail, forming a circuit; The first signal from the first segment enters the second segment; the tuning unit on the receiving side in the second segment resonates in series with the first signal, forming zero impedance; The tuning unit on the receiving side of the first segment is connected in parallel with the tuning unit on the receiving side of the second segment; the impedance is less than the threshold. After passing through the matching transformer, the impedance is less than the threshold. The common-mode inductor unit and the transmission cable resonate in parallel to increase the channel impedance and reduce the transmitter output power after the mechanical insulation joint is damaged.

2. The insulated track circuit according to claim 1, characterized in that, On the transmitting side: the transmitting device is connected to the primary winding of the lightning protection transformer; The secondary winding of the lightning protection transformer is connected to one side of the transmission cable; The other side of the transmission cable is connected to one side of the common-mode inductor unit; The other side of the common-mode inductor unit is connected to the primary winding of the matching transformer; The secondary winding of the matching transformer is connected to the rail; The tuning unit is disposed between the two connection points of the matching transformer and the rail; and the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

3. The insulated track circuit according to claim 1, characterized in that, On the receiving side: the receiving device is connected to the primary winding of the lightning protection transformer; The secondary winding of the lightning protection transformer is connected to one side of the transmission cable; The other side of the transmission cable is connected to one side of the common-mode inductor unit; The other side of the common-mode inductor unit is connected to the primary winding of the matching transformer; The secondary winding of the matching transformer is connected to the rail; The tuning unit is disposed between the two connection points of the matching transformer and the rail; and the tuning unit is located at both ends of the mechanical insulation joint in the insulated rail circuit.

4. The insulated track circuit according to claim 1, characterized in that, The common-mode inductor unit includes: a common-mode inductor.

5. The insulated track circuit according to claim 1, characterized in that, The common-mode inductor unit includes a first branch and a second branch; One end of the first branch is connected to one end of one side of the transmission cable; One end of the second branch is connected to the other end of one side of the transmission cable; The other end of the first branch is connected to one end of the primary winding of the matching transformer; The other end of the second branch is connected to the other end of the primary winding of the matching transformer.

6. The insulated track circuit according to claim 5, characterized in that, The common-mode inductor unit includes: at least one first inductor and at least one second inductor; The first inductor is installed on the first branch; The second inductor is provided on the second branch.

7. The insulated track circuit according to claim 6, characterized in that, The number of the first inductors is 1; The number of the second inductor is 1.

8. The insulated track circuit according to claim 1, characterized in that, The signal frequencies of two adjacent sections are different.

9. The insulated track circuit according to claim 1, characterized in that, The signal frequencies of two segments separated by one section are the same.

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