Current detection device and monitoring system for railway signaling equipment

Abstract

This invention discloses a current detection device and monitoring system suitable for railway signaling equipment, belonging to the field of rail transit technology. The current detection device includes a magnetic circuit acquisition module, a temperature detection module, and a data processing module. The magnetic circuit acquisition module surrounds the cable under test, amplifying the magnetic field generated by the cable and outputting a voltage signal. The temperature detection module detects the temperature of the environment in which the magnetic circuit acquisition module is located. The data processing module is electrically connected to both the magnetic circuit acquisition module and the temperature detection module, compensating for the voltage signal based on the temperature and outputting a current signal. This invention can improve measurement accuracy without affecting the main system function of the railway signaling equipment.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and in particular to a current detection device and monitoring system suitable for railway signaling equipment. Background Technology

[0002] Railway signaling equipment is used to control train operation and is classified as a safety-critical device. Monitoring the electrical parameters of each channel of the signaling equipment and understanding its real-time operating status is crucial for safe train operation. The electromagnetic environment along railway lines is complex. To effectively avoid harmonic interference and ensure the reliable operation of railway signaling equipment, most systems employ DC power supply, signal control, and display. Therefore, DC current monitoring technology suitable for railway signaling equipment has been extensively studied.

[0003] However, existing technologies for monitoring DC current can affect the main system functions of railway signaling equipment and have low measurement accuracy. Summary of the Invention

[0004] This invention provides a current detection device and monitoring system suitable for railway signaling equipment, so as to improve measurement accuracy without affecting the main system function of railway signaling equipment.

[0005] According to one aspect of the present invention, a current detection device suitable for railway signaling equipment is provided, comprising: The magnetic circuit acquisition module, which encloses the cable under test, is used to amplify the magnetic field generated by the cable under test and output a voltage signal. A temperature detection module is used to detect the temperature of the environment in which the magnetic circuit acquisition module is located; The data processing module is electrically connected to the magnetic circuit acquisition module and the temperature detection module, respectively, and is used to compensate the voltage signal based on the temperature and output a current signal.

[0006] Optionally, the magnetic circuit acquisition module includes a U-shaped nanocrystalline iron core and a Hall element. The U-shaped nanocrystalline iron core includes a first bent portion, a first end portion, and a second end portion. The first end portion and the second end portion are connected through the first bent portion. The first end portion and the second end portion are arranged opposite to each other and form an air gap in the U-shaped nanocrystalline iron core. The Hall element is disposed in the air gap. or, The magnetic circuit acquisition module includes a U-shaped silicon steel magnetic core and a Hall element. The U-shaped silicon steel magnetic core includes a second bent portion, a third end portion, and a fourth end portion. The third end portion and the fourth end portion are connected through the second bent portion. The third end portion and the fourth end portion are arranged opposite to each other and form an air gap in the U-shaped silicon steel magnetic core. The Hall element is disposed in the air gap.

[0007] Optionally, the ratio of the magnetic circuit length to the cross-sectional area of ​​the U-shaped nanocrystalline iron core ranges from 3.5 to 4.2 mm. -1 ; The air gap width ranges from 0.8 to 1.2 mm.

[0008] Optionally, the temperature detection module, the data processing module, and the Hall element are disposed on the same substrate.

[0009] Optionally, the current detection device further includes: a U-shaped main body, a U-shaped pressure plate, and a locking screw, wherein the U-shaped pressure plate and the U-shaped main body are arranged along a first direction and are locked and fixed by the locking screw; The U-shaped main body is a hollow structure that encloses the magnetic circuit acquisition module, and the substrate is disposed on the first side wall of the U-shaped main body.

[0010] Optionally, the U-shaped main body includes a fifth end and a sixth end; The fifth end is located on the side away from the first end, and the sixth end is located on the side away from the second end.

[0011] Optionally, the data processing module includes a Hall signal conditioning circuit; The Hall signal conditioning circuit includes an operational amplifier circuit and a protection circuit. The input terminal of the operational amplifier circuit is connected to the Hall element, and the operational amplifier circuit is used to amplify the voltage signal. The output terminal of the operational amplifier circuit is connected to the protection circuit, and the protection circuit is used to protect the output interface of the Hall signal conditioning circuit.

[0012] Optionally, the operational amplifier circuit includes an operational amplifier, a first resistor, and a second resistor; The first input terminal of the operational amplifier is connected to the Hall element, the second input terminal of the operational amplifier is connected to the first terminal of the first resistor, the first terminal of the first resistor is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the output terminal of the operational amplifier, and the second terminal of the first resistor is grounded. The protection circuit includes a fuse, a first capacitor, a first Zener diode, and a second Zener diode; The first end of the fuse is connected to the output end of the operational amplifier. The second end of the fuse, the first end of the first capacitor, the first end of the first Zener diode, and the first end of the second Zener diode are all connected to the first output interface of the Hall signal conditioning circuit. The second end of the first capacitor, the second end of the first Zener diode, and the second end of the second Zener diode are all connected to the second output interface of the Hall signal conditioning circuit. The second output interface is grounded.

[0013] According to another aspect of the present invention, a monitoring system suitable for railway signaling equipment is provided, comprising at least one current detection device suitable for railway signaling equipment provided in any embodiment of the present invention.

[0014] Optionally, the monitoring system for railway signaling equipment further includes: a channel synchronous acquisition module and a host computer, wherein the channel synchronous acquisition module is connected to at least one of the data processing modules and is used to acquire the current signal output by at least one of the data processing modules; the host computer is connected to the channel synchronous acquisition module.

[0015] The technical solution of this invention, by setting a current detection device including a magnetic circuit acquisition module, a temperature detection module, and a data processing module, enables the magnetic circuit acquisition module to amplify the corresponding magnetic field changes when current flows through the cable under test and output a voltage signal corresponding to the magnetic field changes. The temperature detection module can detect the temperature of the environment where the magnetic circuit acquisition module is located. The data processing module receives the voltage signal and temperature, and compensates for the voltage signal based on the temperature, which can avoid the problem of inaccurate output voltage signal caused by temperature drift of the magnetic circuit acquisition module, thereby improving the accuracy of the voltage signal and thus improving the accuracy of current measurement, and consequently improving the reliability of railway signaling equipment. Furthermore, the current detection device measures current in a non-contact manner, without intruding into the main circuit of the railway signaling system, and will not cause changes in the circuit impedance of the railway signaling equipment, affecting the main system function, or introducing new risk points. Therefore, it has high safety and meets the usage requirements of railway signaling equipment and other equipment with stringent safety requirements.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a current detection device suitable for railway signaling equipment provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another current detection device suitable for railway signaling equipment provided in an embodiment of the present invention; Figure 3This is a schematic diagram of another current detection device suitable for railway signaling equipment provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a Hall signal conditioning circuit provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of a monitoring system for railway signaling equipment provided in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and their variations, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Research has found that existing technologies typically use resistance measurement and conventional Hall effect sensors to monitor the DC current of railway signaling equipment.

[0022] Specifically, the resistance sampling method involves inserting a sampling resistor in series in the railway signaling equipment circuit. Based on Ohm's law, the resistor converts the current into a voltage signal for measurement. When current flows through the sampling resistor, a voltage drop proportional to the current is generated across its terminals. By measuring this voltage and combining it with the resistance value, the magnitude of the current can be deduced.

[0023] A typical Hall effect sensor usually consists of a Hall element, a magnetic field conditioning section, and a signal processing circuit. When current flows through a conductor, a magnetic field is generated, which affects the built-in Hall element. When the Hall element is subjected to the magnetic field, the output voltage signal is proportional to the current intensity, thus enabling current measurement. The signal processing circuit amplifies and processes the output signal to obtain an accurate current value.

[0024] However, resistance sampling is an invasive measurement method. Inserting a sampling resistor in series into the circuit of railway signaling equipment can lead to changes in circuit impedance, affecting the main system's functionality. Furthermore, railway signaling equipment is subject to stringent safety requirements; introducing external circuitry into the equipment circuitry introduces risks and reduces the reliability of the railway signaling equipment. Conventional open-loop Hall effect sensors, due to their open air gap design, suffer from unstable magnetic flux and are susceptible to temperature changes and external magnetic field interference, resulting in significant temperature drift and zero drift, affecting measurement accuracy.

[0025] To address the aforementioned problems, embodiments of the present invention provide a current detection device suitable for railway signaling equipment. Figure 1 This is a schematic diagram of a current detection device suitable for railway signaling equipment provided in an embodiment of the present invention. (See attached diagram.) Figure 1 The current detection device for railway signaling equipment includes a magnetic circuit acquisition module 10, a temperature detection module 20, and a data processing module 30.

[0026] The magnetic circuit acquisition module 10 surrounds the cable under test 100. The magnetic circuit acquisition module 10 amplifies the magnetic field generated by the cable under test 100 and outputs a voltage signal. The temperature detection module 20 is located in the environment where the magnetic circuit acquisition module 10 is located. The temperature detection module 20 is used to detect the temperature of the environment where the magnetic circuit acquisition module 10 is located. The data processing module 30 is electrically connected to both the magnetic circuit acquisition module 10 and the temperature detection module 20. The data processing module 30 is used to compensate for the voltage signal based on temperature and output a current signal.

[0027] The data processing module 30 can store a polynomial compensation algorithm (temperature compensation algorithm) to compensate for the voltage signal through temperature, eliminating the temperature drift of the magnetic circuit acquisition module 10. For example, the process of obtaining the temperature compensation algorithm can be as follows: First, a constant magnetic field is input into the magnetic circuit acquisition module across the entire temperature range, and the voltage signal output by the magnetic circuit acquisition module at different temperatures is recorded to establish a correspondence between temperature and the original voltage signal. Then, curve fitting techniques such as the least squares method can be used, with temperature as the independent variable and output voltage error as the dependent variable, to calculate the coefficients of an optimally fitted polynomial. Once the polynomial coefficients are determined, the polynomial compensation algorithm is obtained. After the polynomial compensation algorithm is determined, the data processing module receives the temperature collected by the temperature detection module, substitutes the temperature into the polynomial compensation algorithm, calculates the compensation value corresponding to that temperature, and then compensates the voltage signal output by the magnetic circuit acquisition module based on the compensation value.

[0028] The cable under test 100 is a cable in railway signaling equipment that can characterize the status of railway signaling equipment. The magnetic circuit can be specifically understood as the magnetic core in the magnetic circuit acquisition module 10, forming a ring-shaped magnetic circuit along the direction of the magnetic field generated when current flows through the cable under test 100.

[0029] Specifically, when current flows through the cable under test 100, the corresponding magnetic field also changes. The magnetic circuit acquisition module 10 focuses and amplifies the magnetic field and outputs a voltage signal corresponding to the change in magnetic field. Simultaneously, the temperature detection module 20 acquires the temperature of the environment where the magnetic circuit acquisition module 10 is located. The data processing module 30 receives the voltage signal and temperature respectively, calculates a compensation value based on the temperature, compensates the voltage signal using the compensation value, and outputs a current signal based on the compensated voltage signal. That is, the technical solution provided by this embodiment of the invention does not require the current detection device to be connected in series to the railway signaling equipment circuit, thus avoiding intrusion into the main circuit of the railway signaling system, resulting in higher security. Furthermore, the data processing module 30 itself stores a temperature compensation algorithm, which can calculate a compensation value based on the received temperature, thereby compensating the voltage signal output by the magnetic circuit acquisition module 10. This avoids the problem of inaccurate output voltage signal caused by temperature drift in the magnetic circuit acquisition module 10, further improving the accuracy of current measurement.

[0030] The technical solution of this invention, by setting a current detection device including a magnetic circuit acquisition module, a temperature detection module, and a data processing module, enables the magnetic circuit acquisition module to amplify the corresponding magnetic field changes when current flows through the cable under test and output a voltage signal corresponding to the magnetic field changes. The temperature detection module can detect the temperature of the environment where the magnetic circuit acquisition module is located. The data processing module receives the voltage signal and temperature, and compensates for the voltage signal based on the temperature, which can avoid the problem of inaccurate output voltage signal caused by temperature drift of the magnetic circuit acquisition module, thereby improving the accuracy of the voltage signal and thus improving the accuracy of current measurement, and consequently improving the reliability of railway signaling equipment. Furthermore, the current detection device measures current in a non-contact manner, without intruding into the main circuit of the railway signaling system, and will not cause changes in the circuit impedance of the railway signaling equipment, affecting the main system function, or introducing new risk points. Therefore, it has high safety and meets the usage requirements of railway signaling equipment and other equipment with stringent safety requirements.

[0031] It is understandable that the magnetic circuit acquisition module 10 may include various structures, as long as it can amplify the magnetic field and output a voltage signal. The following describes the structures that the magnetic circuit acquisition module 10 may have.

[0032] In one embodiment, see Figure 1Optionally, the magnetic circuit acquisition module 10 includes a U-shaped nanocrystalline iron core 11 and a Hall element 12. The U-shaped nanocrystalline iron core 11 includes a first bent portion, a first end, and a second end. The first end and the second end are connected by the first bent portion and are arranged opposite to each other. The first end and the second end are, for example, curved surfaces, forming an air gap in the U-shaped nanocrystalline iron core 11. The Hall element 12 is disposed at the air gap. Exemplarily, the Hall element 12 may be specifically disposed at a position opposite to the highest point of the first end curved surface and the highest point of the second curved surface.

[0033] The Hall element 12 can be a linear Hall element. The data processing module 30 specifically inputs the temperature into its stored polynomial compensation algorithm and calculates the compensation value corresponding to the temperature through the polynomial compensation algorithm. The voltage signal output by the Hall element 12 is compensated according to the compensation value, thereby eliminating the temperature drift of the Hall element 12.

[0034] Understandably, before using the U-shaped nanocrystalline iron core 11, its parameters are first optimized through core permeability optimization and air gap magnetic field focusing design. For example, by performing the core permeability optimization step, the magnetic circuit length and cross-sectional area of ​​the U-shaped nanocrystalline iron core 11 can be optimized; by performing the air gap magnetic field focusing design step, the air gap width of the U-shaped nanocrystalline iron core 11 can be optimized. This allows the U-shaped nanocrystalline iron core 11 to increase the magnetic field strength of the cable under test 100 by 8-12 times, enabling the current detection device to achieve accurate measurement of small currents with a resolution of 10mA, and improving its anti-interference capability. The small current can be 0.5A-5A.

[0035] Specifically, by employing a U-shaped nanocrystalline iron core 11 as the main magnetic circuit, a linear Hall element 12 is integrated into the air gap of the U-shaped nanocrystalline iron core 11 to ensure that the Hall element 12 is in a uniform magnetic field region, thereby improving the speed at which the Hall element 12 responds to changes in the magnetic field and the accuracy of the output voltage signal. Furthermore, the current detection device in this solution is equivalent to using a U-shaped nanocrystalline iron core and a Hall element. This measurement method is non-contact, requiring no intrusion into the main circuit of the railway signaling system, thus avoiding the introduction of new risk points, ensuring high safety, and meeting the stringent safety requirements of railway signaling and other similar equipment.

[0036] In another embodiment, optionally, the magnetic circuit acquisition module includes a U-shaped silicon steel magnetic core and a Hall element. The U-shaped silicon steel magnetic core includes a second bent portion, a third end and a fourth end. The third end and the fourth end are connected through the second bent portion. The third end and the fourth end are arranged opposite to each other and form an air gap in the U-shaped silicon steel magnetic core. The Hall element is disposed in the air gap.

[0037] Based on the above embodiments, optionally, the ratio of the magnetic circuit length to the cross-sectional area of ​​the U-shaped nanocrystalline iron core is in the range of 3.5-4.2 mm. -1 This technology enables the leakage magnetic coefficient of the U-shaped nanocrystalline iron core to be ≤0.05, resulting in almost no magnetic field energy loss. Consequently, it can generate a stronger and purer confinement magnetic field than traditional magnetic cores under the same excitation, further improving the accuracy of the Hall element's output voltage signal and making it suitable for high-precision current measurement scenarios.

[0038] Based on the above embodiments, optionally, the air gap width is in the range of 0.8-1.2 mm, which can ensure that the Hall element is in a uniform magnetic field region.

[0039] In related technologies, the DC current of railway signaling equipment is also monitored using fluxgate sensors.

[0040] Specifically, a fluxgate magnetometer is a weak magnetic field measuring device that operates based on the nonlinear magnetization characteristics of a high-permeability iron core in an alternating magnetic field. Its core structure consists of a magnetic core made of a high-permeability soft magnetic material, an excitation coil, and an induction coil. When current flows through the magnetic core, a change in the magnetic field is generated, causing a change in the permeability of the core. The fluxgate magnetometer applies an alternating magnetic field through the excitation coil, detects the second harmonic signal intensity of the induction coil, and thus calculates the current magnitude.

[0041] However, although the fluxgate sensor measurement method has high accuracy and is non-invasive, it is bulky and cannot meet the high-density installation requirements of signal equipment. Therefore, this testing method has high space requirements.

[0042] Figure 2 This is a schematic diagram of another current detection device suitable for railway signaling equipment provided by an embodiment of the present invention, specifically showing an assembly diagram of the current detection device. Figure 3 This is a schematic diagram of another current detection device suitable for railway signaling equipment provided in an embodiment of the present invention, specifically showing a schematic diagram after assembly. See also... Figure 2 and Figure 3 Based on the above embodiments, optionally, the temperature detection module, data processing module, and Hall element are disposed on the same substrate. This allows the temperature detection module, data processing module, and Hall element to be integrated into a small package, resulting in high integration and enabling flexible, high-density installation in space-constrained environments such as signal equipment room cabinets.

[0043] A current detection device can be understood as a miniaturized current sensor, which can be embedded in a miniaturized PCB to measure the current of the cable under test.

[0044] See also Figure 2Optionally, the current detection device further includes: a U-shaped main body 201, a U-shaped pressure plate 202, and a locking screw 203. The U-shaped pressure plate 202 and the U-shaped main body 201 are arranged along a first direction Y and are locked and fixed by the locking screw 203, wherein the first direction Y is the extension direction of the cable 100 under test. The U-shaped main body 201 is a hollow structure that encloses the magnetic circuit acquisition module. The substrate 300 is disposed on the first sidewall of the U-shaped main body 201. The first sidewall is, for example, a plane, to facilitate the placement of the substrate 300. With the above configuration, the current detection device can have the advantages of high integration and small size, which can meet the high-density installation requirements in the chassis of signal equipment.

[0045] Optionally, the U-shaped main body 201 also includes a second sidewall and a third sidewall disposed on both sides of the first sidewall. Both the second sidewall and the third sidewall are curved surfaces to better wrap the U-shaped nanocrystalline iron core.

[0046] Optionally, the U-shaped main body 201 also includes a positioning part, and the U-shaped pressure plate 202 also includes a positioning hole. During assembly, positioning in the first direction Y can be achieved by the cooperation of the positioning hole of the U-shaped pressure plate 202 and the positioning part of the U-shaped main body 201. After the U-shaped pressure plate 202 and the surface of the U-shaped main body 201 are attached, they are locked and fixed by the locking screw 203.

[0047] See also Figure 2 Optionally, the U-shaped main body 201 includes a fifth end and a sixth end, which are not connected; the fifth end is located on the side away from the first end, and the sixth end is located on the side away from the second end. This arrangement allows the Hall element to be located on the side where the substrate is located, simplifying the assembly process of the current detection device. The thickness of the second and third sidewalls near the first sidewall is greater than the thickness of the second and third sidewalls near the ends.

[0048] Figure 4 This is a schematic diagram of a Hall signal conditioning circuit provided in an embodiment of the present invention. See also: Figure 4 Based on the above embodiments, the data processing module may optionally include a Hall signal conditioning circuit 301; The Hall signal conditioning circuit includes an operational amplifier circuit 311 and a protection circuit 321; The input terminal of the operational amplifier circuit 311 is connected to the Hall element 12. The operational amplifier circuit 311 is used to amplify the voltage signal. The output terminal of the operational amplifier circuit 311 is connected to the protection circuit 321. The protection circuit 321 is used to protect the output interface of the Hall signal conditioning circuit 301.

[0049] See also Figure 4Optionally, the operational amplifier circuit 311 includes an operational amplifier U1, a first resistor R1, and a second resistor R2; the first input terminal of the operational amplifier U1 is connected to the Hall element 12, the second input terminal of the operational amplifier U1 is connected to the first terminal of the first resistor R1, the first terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is connected to the output terminal of the operational amplifier U1, and the second terminal of the first resistor R1 is grounded.

[0050] Among them, the second resistor R2 is the negative feedback resistor.

[0051] Optionally, the operational amplifier U1 also includes a first power supply terminal and a second power supply terminal, and the operational amplifier circuit 311 also includes a second capacitor C2. The second capacitor C2 is connected between the first power supply terminal of the operational amplifier U1 and ground. The first power supply terminal of the operational amplifier U1 is connected to a first voltage VCC, and the second power supply terminal of the operational amplifier U1 is grounded.

[0052] Optionally, the Hall signal conditioning circuit 301 further includes a third resistor R3, the first end of which is connected to the output terminal of the operational amplifier U1, and the second end of which is connected to the protection circuit 321. The third resistor R3 is used for current limiting.

[0053] The protection circuit 321 includes a fuse FB1, a first capacitor C1, a first Zener diode ZD1, and a second Zener diode ZD2. The first end of the fuse FB1 is connected to the output terminal of the operational amplifier U1. The second end of the fuse FB1, the first end of the first capacitor C1, the first end of the first Zener diode ZD1, and the first end of the second Zener diode ZD2 are all connected to the first output interface Vout1 of the Hall signal conditioning circuit 301. The second end of the first capacitor C1, the second end of the first Zener diode ZD1, and the second end of the second Zener diode ZD2 are all connected to the second output interface Vout2 of the Hall signal conditioning circuit 301. The second output interface Vout2 is grounded.

[0054] This invention also provides a monitoring system suitable for railway signaling equipment, including at least one current detection device for railway signaling equipment provided in any of the above embodiments. Therefore, this monitoring system has corresponding beneficial effects.

[0055] Figure 5 A schematic diagram of a monitoring system for railway signaling equipment provided in an embodiment of the present invention is shown below. Figure 5 The monitoring system for railway signaling equipment includes at least one current detection device 400 suitable for railway signaling equipment.

[0056] Optionally, the monitoring system for railway signaling equipment also includes a channel synchronous acquisition module 40 and a host computer 50. The channel synchronous acquisition module 40 is connected to at least one data processing module 30 and is used to acquire the current signal output by at least one data processing module 30. The host computer 50 is connected to the channel synchronous acquisition module 40.

[0057] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0058] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A current detection device suitable for railway signaling equipment, characterized in that, The current detection device includes: The magnetic circuit acquisition module, which encloses the cable under test, is used to amplify the magnetic field generated by the cable under test and output a voltage signal. A temperature detection module is used to detect the temperature of the environment in which the magnetic circuit acquisition module is located; The data processing module is electrically connected to the magnetic circuit acquisition module and the temperature detection module, respectively, and is used to compensate the voltage signal based on the temperature and output a current signal.

2. The current detection device for railway signaling equipment according to claim 1, characterized in that, The magnetic circuit acquisition module includes a U-shaped nanocrystalline iron core and a Hall element. The U-shaped nanocrystalline iron core includes a first bent portion, a first end portion, and a second end portion. The first end portion and the second end portion are connected through the first bent portion. The first end portion and the second end portion are arranged opposite to each other and form an air gap in the U-shaped nanocrystalline iron core. The Hall element is disposed in the air gap. or, The magnetic circuit acquisition module includes a U-shaped silicon steel magnetic core and a Hall element. The U-shaped silicon steel magnetic core includes a second bent portion, a third end portion, and a fourth end portion. The third end portion and the fourth end portion are connected through the second bent portion. The third end portion and the fourth end portion are arranged opposite to each other and form an air gap in the U-shaped silicon steel magnetic core. The Hall element is disposed in the air gap.

3. The current detection device for railway signaling equipment according to claim 2, characterized in that, The ratio of the magnetic path length of the U-shaped nanocrystalline iron core to the cross-sectional area of the U-shaped nanocrystalline iron core ranges from 3.5 to 4.2 mm -1 ; The air gap width ranges from 0.8 to 1.2 mm.

4. The current detection device for railway signaling equipment according to claim 2, characterized in that, The temperature detection module, the data processing module, and the Hall element are disposed on the same substrate.

5. The current detection device for railway signaling equipment according to claim 4, characterized in that, The current detection device further includes: a U-shaped main body, a U-shaped pressure plate, and a locking screw. The U-shaped pressure plate and the U-shaped main body are arranged along a first direction and are locked and fixed by the locking screw. The U-shaped main body is a hollow structure that encloses the magnetic circuit acquisition module, and the substrate is disposed on the first side wall of the U-shaped main body.

6. The current detection device for railway signaling equipment according to claim 5, characterized in that, The U-shaped main body includes a fifth end and a sixth end; The fifth end is located on the side away from the first end, and the sixth end is located on the side away from the second end.

7. The current detection device for railway signaling equipment according to claim 2, characterized in that, The data processing module includes a Hall signal conditioning circuit; The Hall signal conditioning circuit includes an operational amplifier circuit and a protection circuit. The input terminal of the operational amplifier circuit is connected to the Hall element, and the operational amplifier circuit is used to amplify the voltage signal. The output terminal of the operational amplifier circuit is connected to the protection circuit, and the protection circuit is used to protect the output interface of the Hall signal conditioning circuit.

8. The current detection device for railway signaling equipment according to claim 7, characterized in that, The operational amplifier circuit includes an operational amplifier, a first resistor, and a second resistor; The first input terminal of the operational amplifier is connected to the Hall element, the second input terminal of the operational amplifier is connected to the first terminal of the first resistor, the first terminal of the first resistor is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the output terminal of the operational amplifier, and the second terminal of the first resistor is grounded. The protection circuit includes a fuse, a first capacitor, a first Zener diode, and a second Zener diode; The first end of the fuse is connected to the output end of the operational amplifier. The second end of the fuse, the first end of the first capacitor, the first end of the first Zener diode, and the first end of the second Zener diode are all connected to the first output interface of the Hall signal conditioning circuit. The second end of the first capacitor, the second end of the first Zener diode, and the second end of the second Zener diode are all connected to the second output interface of the Hall signal conditioning circuit. The second output interface is grounded.

9. A monitoring system suitable for railway signaling equipment, characterized in that, It includes at least one current detection device suitable for railway signaling equipment as claimed in any one of claims 1-8.

10. The monitoring system for railway signaling equipment according to claim 9, characterized in that, Also includes: The system includes a channel synchronous acquisition module and a host computer. The channel synchronous acquisition module is connected to at least one of the data processing modules and is used to acquire the current signal output by at least one of the data processing modules. The host computer is connected to the channel synchronous acquisition module.

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