Non-contact voltage monitoring device for railway signal equipment

Abstract

The embodiment of the utility model relates to the technical field of railway signal monitoring, and discloses a non-contact voltage monitoring device for railway signal equipment, which comprises a non-contact voltage sensor, a data processing circuit module and a data center, and the data processing circuit module is used for rectifying, following, amplifying and stabilizing the voltage of the alternating current sampling signal to obtain an amplified and stabilized voltage signal, converting the analog quantity of the amplified and stabilized voltage signal into a digital quantity, transmitting the digital quantity to a data center for calculation, and outputting a calculation result. According to the non-contact voltage monitoring device, the line-to-line voltage of the power supply circuit is monitored in a non-contact mode, the problem of voltage monitoring under the condition that an original line is not affected is solved, non-contact measurement of low-voltage alternating current is achieved, and stable line operation is guaranteed.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to railway signal monitoring technical field, especially relate to a railway signal equipment non - contact voltage monitoring device. BACKGROUND

[0002] Railway signal equipment electrical characteristic monitoring is an important means to ensure train operation safety, strengthen signal equipment joint management and monitor railway signal equipment operation quality. In signal equipment electrical characteristic monitoring technology, voltage parameter is a key perception quantity of signal equipment.

[0003] Currently, the contact type measurement method is used for railway signal equipment voltage data monitoring, that is, the measuring device is connected in parallel at the voltage position to be measured to obtain corresponding voltage data by measuring relative voltage value.

[0004] Therefore, how to realize non-contact measurement of railway signal voltage is a problem to be solved. UTILITY MODEL CONTENT

[0005] The embodiment of the utility model relates to railway signal monitoring technical field, especially relate to a railway signal equipment non - contact voltage monitoring device.

[0006] To solve the above technical problems, at least one embodiment of the present application provides a railway signal equipment non-contact voltage monitoring device, comprising: a non-contact voltage sensor, a data processing circuit module and a data center, the non-contact voltage sensor is used for sampling the line-to-line voltage of the power supply circuit of the railway signal equipment to obtain an alternating current sampling signal, the data processing circuit module is used for rectifying, following, amplifying and stabilizing the alternating current sampling signal to obtain an amplified and stabilized signal, converting the analog quantity of the amplified and stabilized signal into digital quantity, transmitting the digital quantity to the data center for calculation, and outputting the calculation result.

[0007] The railway signal equipment non-contact voltage monitoring device provided by the embodiment of the present application, compared with the prior art, adopts the non-contact voltage sensor to realize non-contact sampling of low-voltage alternating current, adopts the data processing circuit module to rectify, follow, amplify, stabilize, analog-digital convert and isolate the alternating current sampling signal, and then transmit the digital quantity of the amplified and stabilized signal to the data center, since the alternating current is sampled non-contactly, the original circuit structure does not need to be damaged, thus solving the problem of monitoring voltage without affecting the original circuit, achieving non-contact measurement of low-voltage alternating current, and ensuring the stability of circuit operation.

[0008] In addition, the non-contact voltage sensor adopts a separated voltage sensor, which can place the circuit in the center of the sensor without connecting the detection circuit on the circuit, thereby realizing non-contact detection of line-to-line voltage.

[0009] In addition, the data processing circuit module comprises a rectifier circuit, a following circuit, an amplification and stabilization circuit, an analog-digital conversion circuit and an isolation circuit connected in sequence, the rectifier circuit is used for rectifying the alternating current signal detected by the non-contact voltage sensor to obtain a direct current sampling signal, the following circuit is used for feeding back and following the direct current sampling signal, the amplification and stabilization circuit is used for amplifying and stabilizing the direct current sampling signal to obtain an amplified and stabilized signal, the analog-digital conversion circuit is used for converting the analog quantity of the amplified and stabilized signal into digital quantity, and the isolation circuit is used for transmitting the digital quantity of the amplified and stabilized signal to the data center. By rectifying the sampling signal to obtain a direct current sampling signal, following the direct current sampling signal to improve the load capacity of the direct current sampling signal, and then amplifying and stabilizing the direct current sampling signal to improve the accuracy of the direct current sampling signal, and through analog-digital conversion, the digital quantity that can be processed by the data center is obtained.

[0010] In addition, the follow-up circuit comprises a first follow-up sub-circuit and a second follow-up sub-circuit, an input end of the first follow-up sub-circuit is connected with an output end of the rectifier circuit through a first resistor, an output end of the second follow-up sub-circuit, one end of the first resistor connected with the rectifier circuit is used as an input end of the follow-up circuit, an output end of the first follow-up sub-circuit is connected with an input end of the second follow-up sub-circuit and used as an output end of the follow-up circuit. Through the follow-up of the first follow-up sub-circuit, the carrying capacity of the direct current sampling signal is improved, and the second follow-up sub-circuit is used for feedback of the output of the first follow-up sub-circuit, thereby improving the detection accuracy.

[0011] In addition, the first follow-up sub-circuit comprises a first amplifier and a first diode, a positive input end of the first amplifier is used as an input end of the first follow-up sub-circuit, a negative input end of the first amplifier is connected with a negative electrode of the first diode and used as an output end of the follow-up circuit, and an output end of the first amplifier is connected with a positive electrode of the first diode. According to the unidirectional conductivity of the diode, the reverse flow to the first amplifier is avoided.

[0012] In addition, the second follow-up sub-circuit comprises a second amplifier and a second diode, a positive input end of the second amplifier is connected with an output end of the first follow-up sub-circuit, a negative input end of the second amplifier is connected with an output end of the second amplifier, a positive electrode of the second diode, a negative electrode of the second diode is used as an output end of the second follow-up sub-circuit and connected with an input end of the first follow-up sub-circuit. According to the unidirectional conductivity of the diode, the reverse flow to the second amplifier is avoided.

[0013] In addition, the amplification and voltage stabilization circuit comprises a voltage division circuit, an amplification sub-circuit and a voltage stabilization circuit connected in sequence, the voltage division circuit comprises a first series resistor string and is used for voltage division of an output voltage of the follow-up circuit to obtain a first voltage division; the amplification sub-circuit comprises a third amplifier and is used for amplification of the first voltage division to obtain an amplified signal; and the voltage stabilization circuit comprises a voltage stabilization tube and is used for voltage stabilization of the amplified signal to obtain an amplified and voltage stabilized signal. The voltage division, amplification and voltage stabilization are performed in sequence, thereby improving the detection accuracy.

[0014] In addition, the amplification sub-circuit comprises a third amplifier and a second series resistor string, a positive input end of the third amplifier is connected with an output end of the voltage division circuit, a negative input end of the third amplifier is connected with a series connection point of the second series resistor string, and an output end of the third amplifier is used as an output end of the amplification sub-circuit and connected with one end of the second series resistor string, and the other end of the second series resistor string is connected with an analog ground.

[0015] In addition, the voltage stabilization circuit comprises a third diode, a voltage stabilization tube, a second capacitor and a seventh resistor, a negative electrode of the third diode is connected with a power supply end of a power supply, a positive electrode of the third diode is connected with a voltage stabilization end of the voltage stabilization tube, one end of the second capacitor, one end of the seventh resistor and an output end of the amplification sub-circuit, the voltage stabilization end of the voltage stabilization tube is used as a voltage stabilization end of the voltage stabilization circuit, and the other end of the voltage stabilization tube, the other end of the second capacitor and the other end of the seventh resistor are connected with an analog ground.

[0016] In addition, the analog-digital conversion circuit comprises an analog-digital conversion chip for converting the analog quantity of the amplified and stabilized signal into a digital quantity; the isolation circuit comprises an isolation communication chip for transmitting the digital quantity of the amplified and stabilized signal to the data center; the data center comprises a processor and a memory for processing and storing the digital quantity of the amplified and stabilized signal and outputting and / or displaying. BRIEF DESCRIPTION OF DRAWINGS

[0017] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which do not limit the present embodiments in which like reference numerals refer to similar elements in the drawings and wherein:

[0018] Figure 1 is a structural schematic diagram of a non-contact voltage monitoring device according to an embodiment of the present application;

[0019] Figure 2 is a structural schematic diagram of a non-contact voltage sensor according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a follow-up circuit according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of an amplified and stabilized circuit according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of an analog-digital conversion circuit according to an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of an isolation circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the various embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, even without these technical details and based on various changes and modifications of the following embodiments, the technical solutions claimed by the present application can be implemented.

[0025] Embodiment One:

[0026] The embodiment of the utility model relates to a kind of railway signal equipment non-contact voltage monitoring devices, for detecting low-voltage alternating current signal, including non-contact voltage sensor, data processing circuit module and data center, non-contact voltage sensor uses separated voltage transformer, for when monitoring will separated voltage transformer be clamped on the electric wire to be detected, realize non-contact voltage sampling.

[0027] The data processing circuit module is used for processing non-contact voltage sampling data to obtain a processing result, and includes a rectifier circuit, an amplification and voltage stabilization circuit, an analog-to-digital conversion circuit and an isolation circuit connected in sequence. The rectifier circuit is used for rectifying the alternating current signal detected by the non-contact voltage sensor to obtain a direct current sampling signal. The amplification and voltage stabilization circuit is used for amplifying the direct current sampling signal to obtain an amplified signal. The analog-to-digital conversion circuit is used for converting the analog quantity of the amplified signal into a digital quantity. The isolation circuit is used for transmitting the digital quantity to the data center. The data center processes the received digital quantity to obtain a detection result.

[0028] Compared with the prior art, the embodiment of the utility model detects low-voltage alternating current voltage using a non-contact voltage sensor, avoids the influence of contact voltage detection on the line, processes the sampling data of low-voltage alternating current using a data processing circuit module, ensures the accuracy of the detection result, and thus solves the technical problem of how to non-contact detect railway signals.

[0029] The following will specifically describe the implementation details of a railway signal equipment non-contact voltage monitoring device according to the embodiment, and the following content is only provided for the convenience of understanding the implementation details and is not necessary for implementing the scheme.

[0030] The embodiment of the utility model provides a kind of railway signal equipment non-contact voltage monitoring device, as shown in Figure 1 The non-contact voltage sensor uses a separated voltage sensor, which is clamped on the cable to be detected during monitoring to sample the line voltage of the power supply line of the railway signal equipment.

[0031] The data processing circuit module is used for processing and calculating the alternating current signal sampled by the non-contact voltage sensor to obtain the line voltage value, and transmitting the calculation result to the data center. The rectifier circuit, the follow-up circuit, the amplification and voltage stabilization circuit, the analog-to-digital conversion circuit and the isolation circuit are sequentially connected. The rectifier circuit is used for rectifying the alternating current signal detected by the non-contact voltage sensor to obtain a direct current sampling signal. The follow-up circuit is used for feedback following the direct current sampling signal. The amplification and voltage stabilization circuit is used for amplifying and stabilizing the direct current sampling signal to obtain an amplified and stabilized signal. The analog-to-digital conversion circuit is used for converting the analog quantity of the amplified and stabilized signal into a digital quantity. The isolation circuit is used for transmitting the digital quantity of the amplified and stabilized signal to the data center. The data center processes the received digital quantity to obtain a detection result.

[0032] The rectifier circuit includes a rectifier circuit for rectifying the alternating current signal detected by the non-contact voltage sensor to obtain a direct current sampling signal ADC0.

[0033] The follow-up circuit includes a first follow-up sub-circuit and a second follow-up sub-circuit. The input end of the first follow-up sub-circuit is connected to the output end of the rectifier circuit through a first resistor. The output end of the first follow-up sub-circuit serves as the output end of the follow-up circuit. One end of the first resistor connected to the output end of the rectifier circuit serves as the input end of the follow-up circuit. The input end of the second follow-up sub-circuit is connected to the output end of the first follow-up sub-circuit. The output end of the second follow-up sub-circuit is connected to the input end of the first follow-up sub-circuit, and is used for feedback of the output of the first follow-up sub-circuit.

[0034] After the follow-up circuit performs follow-up processing on the direct current sampling signal, because of the high input impedance and low output impedance of the follow-up circuit, impedance matching between the front stage and the rear stage is realized, and the signal stability is improved.

[0035] The first follow-up sub-circuit includes a first amplifier and a first diode. The positive input end of the first amplifier serves as the input end of the first follow-up sub-circuit. The negative input end of the first amplifier is connected to the negative electrode of the first diode and serves as the output end of the follow-up circuit. The output end of the first amplifier is connected to the positive electrode of the first diode.

[0036] The second follow-up sub-circuit includes a second amplifier and a second diode. The positive input end of the second amplifier is connected to the output end of the first follow-up sub-circuit. The negative input end of the second amplifier is connected to the output end of the second amplifier and the positive electrode of the second diode. The negative electrode of the second diode serves as the output end of the second follow-up sub-circuit and is connected to the input end of the first follow-up sub-circuit.

[0037] The amplification and voltage stabilization circuit comprises a voltage division circuit, an amplification sub-circuit and a voltage stabilization circuit connected in sequence.

[0038] The amplification circuit divides the output signal of the follow-up circuit, ensures that the input voltage of the amplification sub-circuit is within the voltage range, the amplification sub-circuit amplifies the divided signal, improves the precision of the sampled direct current signal, and the voltage stabilization circuit stabilizes the amplified signal, improves the stability of detection.

[0039] The amplification sub-circuit comprises a third amplifier and a second series resistor string, the positive input end of the third amplifier is connected to the output end of the voltage division circuit, the negative input end is connected to the series connection point of the second series resistor string, and the output end is connected to one end of the second series resistor string as the output end of the amplification sub-circuit, and the other end of the second series resistor string is connected to the analog ground.

[0040] The voltage stabilization circuit comprises a third diode, a voltage stabilization tube, a second capacitor and a seventh resistor, the negative electrode of the third diode is connected to the power supply end of the power supply, the positive electrode of the third diode is connected to the voltage stabilization end of the voltage stabilization tube, one end of the second capacitor, one end of the seventh resistor and the output end of the amplification sub-circuit as the voltage stabilization end of the voltage stabilization circuit, the other end of the voltage stabilization tube, the other end of the second capacitor and the other end of the seventh resistor are connected to the analog ground.

[0041] The analog-digital conversion circuit comprises an analog-digital conversion chip for converting the analog quantity of the amplified and voltage-stabilized signal into a digital quantity.

[0042] The isolation circuit comprises an isolation communication chip for transmitting the digital quantity of the amplified and voltage-stabilized signal to the data center.

[0043] The data center comprises a processor and a memory for processing and storing the digital quantity of the amplified and voltage-stabilized signal, and outputting or / and displaying.

[0044] The railway signal equipment non-contact voltage monitoring device provided by the embodiment adopts a non-contact voltage sensor and a data processing circuit module, can sample the voltage without affecting the measured circuit signal, and can rectify, follow, divide, amplify and stabilize the sampled alternating current signal through the data processing circuit module to obtain an amplified and voltage-stabilized signal, and then perform analog-digital conversion and isolation on the amplified and voltage-stabilized signal, transmit the signal to the data center for output or display, solve the technical problem of how to non-contact monitor the railway voltage signal, and realize non-contact monitoring of the railway voltage signal without affecting the railway signal circuit.

[0045] Embodiment two

[0046] The embodiment of the utility model is the detailed description of above embodiment one, refer to Figures 2 to 6 .

[0047] Specifically, the non-contact voltage sensor, as shown in Figure 2 , adopts a split voltage sensor, the split voltage sensor includes two semicircle structures, one end of the two semicircle structures is hinged together, the power supply line of the voltage to be measured is placed in the center of the two semicircle structures, and then the two semicircle structures are buckled, for monitoring the voltage of the electric wire to be measured, and the split voltage sensor adopts a capacitive coupling principle to realize non-contact voltage measurement.

[0048] Specifically, the rectifier circuit includes a rectifier circuit for rectifying the alternating current signal detected by the non-contact voltage sensor to obtain a direct current sampling signal ADC0, and the direct current sampling signal ADC0 is grounded through a second resistor R6.

[0049] As shown in Figure 3 , the follower circuit includes a first resistor and a second resistor, a first follower subcircuit and a second follower subcircuit, one end of the first resistor R5 and one end of the second resistor R6 are connected to the output end of the direct current sampling signal ADC0, the other end is connected to the input end of the first follower subcircuit and the output end of the second follower subcircuit, and the other end of the second resistor R6 is connected to the ground AGND.

[0050] The first resistor R5 is used for impedance isolation.

[0051] The first follower subcircuit includes an amplifier U11A, the positive input end of the amplifier U11A is connected to the other end of the first resistor R5 as the input end of the first follower subcircuit, the negative input end is connected to the negative electrode of the first reverse isolation diode D7, and the output end is connected to the positive electrode of the first reverse isolation diode D7. The negative electrode of the first reverse isolation diode D7 is used as the output end of the first follower subcircuit.

[0052] The first reverse isolation diode D7 is used for conduction when the voltage at the output end of the amplifier U11A is greater than the voltage at the negative input end, and reverse bias when the voltage at the output end of the amplifier U11A is greater than the voltage at the negative input end, to prevent current from flowing back into the amplifier.

[0053] The second follower subcircuit has the same structure as the first follower subcircuit, including an amplifier U11B, the positive input end of the amplifier U11B is connected to the output end of the first follower subcircuit as the input end of the second follower subcircuit, the negative input end is connected to the positive electrode of the second reverse isolation diode D6 and the output end, the negative electrode of the second reverse isolation diode D6 is connected to the other end of the first resistor R5 as the output end of the second follower subcircuit.

[0054] The second reverse isolation diode D6 is used to superimpose the output voltage of the amplifier U11B on the voltage at the other end of the first resistor R5 when the output voltage of the amplifier U11B is greater than the voltage at the other end of the first resistor R5, and output through the first following sub-circuit, and only output the voltage at the other end of the first resistor R5 through the first following sub-circuit when the output voltage of the amplifier U11B is less than the voltage at the other end of the first resistor R5.

[0055] The second following sub-circuit is used to feedback the output of the first following sub-circuit to stabilize the output of the first following sub-circuit.

[0056] As shown in Figure 4 The amplification and voltage stabilization circuit includes a voltage division circuit, an amplification sub-circuit and a voltage stabilization circuit connected in sequence, the voltage division circuit includes a first series resistor string, one end of the first series resistor string is connected to the output end of the following circuit, the first series point of the first series resistor string is used as the output end of the voltage division circuit, the other end of the first series resistor string is connected to the ground AGND, and a voltage stabilization capacitor is connected between the first series point and the ground AGND, which is used for voltage stabilization of the voltage division.

[0057] Specifically, the first series resistor string includes two series resistors, a third resistor R7 and a fourth resistor R8, one end of the third resistor R7 is connected to the output end of the following circuit, the other end of the third resistor R7 is connected to one end of the fourth resistor R8, and the other end of the fourth resistor R8 is connected to the ground AGND, and a first capacitor C12 is connected in parallel across the fourth resistor R8, which is used for filtering the voltage division.

[0058] The amplification sub-circuit includes an amplifier U21A, the positive input end of the amplifier U21A is connected to the output end of the voltage division circuit, the negative input end of the amplifier U21A is connected to the second series point of the second series resistor string, the output end of the amplifier U21A is used as the output end of the amplification sub-circuit, one end of the second series resistor string is connected to the output end of the amplifier U21A, and the other end of the second series resistor string is connected to the analog ground AGND.

[0059] Specifically, the second series resistor string includes two series resistors, a fifth resistor R9 and a sixth resistor R10, one end of the fifth resistor R9 is connected to the output end of the amplifier U21A, the other end of the fifth resistor R9 is connected to one end of the sixth resistor R10, and the other end of the sixth resistor R10 is connected to the ground AGND.

[0060] The output end of the amplification sub-circuit is connected to the voltage stabilization end of the voltage stabilization circuit, which is used to output the amplified and voltage-stabilized signal PC0_ADC0.

[0061] The voltage stabilizing circuit comprises a third diode D25, a voltage stabilizing tube DZ2, a second capacitor C26 and a seventh resistor R83, the negative electrode of the diode D25 is connected to the power supply end of the power supply 3.3V, the positive electrode of the diode D25 is connected to the voltage stabilizing end of the voltage stabilizing tube DZ2, one end of the second capacitor C26, one end of the seventh resistor R83 and the output end of the amplifying sub-circuit, as the voltage stabilizing end of the voltage stabilizing circuit, the other end of the voltage stabilizing tube DZ2, the other end of the second capacitor C26 and the other end of the seventh resistor R83 are connected to the ground AGND.

[0062] The voltage stabilizing tube of the voltage stabilizing circuit is used for stabilizing the amplified voltage signal, the diode D25 is used for limiting the maximum value of the amplified voltage signal PC0_ADC0 to 0.7V+3.3V=4V, the second capacitor C26 is used for filtering the amplified voltage signal PC0_ADC0, and the seventh resistor R83 is used for discharging the second capacitor C26.

[0063] The analog-digital conversion circuit comprises an analog-digital conversion chip, as shown in the figure, the analog-digital conversion chip of the application adopts a 24-bit high-precision analog-digital conversion chip, which is used for ensuring the precision of voltage conversion. Figure 5

[0064] The isolation circuit comprises an isolation communication chip, as shown in the figure, the isolation communication chip is used for ensuring that the digital signal does not interfere with the collection of analog quantities and improving the sampling stability. Figure 6

[0065] The data center receives the amplified voltage signal digital quantity transmitted by the isolation circuit, processes and outputs or / and displays.

[0066] It should be understood that the expressions "mechanism", "device", "component" and the like used in the application are only a method for distinguishing different components, elements, parts, portions or assemblies of different levels. However, if other expressions can achieve the same purpose, the expressions can be replaced by other expressions.

[0067] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the application, and in actual application, the technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application, and various changes can be made in form and details without departing from the spirit and scope of the application.​​

Claims

1. A non-contact voltage monitoring device for railway signaling equipment, characterized in that, include: The system comprises a non-contact voltage sensor, a data processing circuit module, and a data center. The non-contact voltage sensor is used to sample the line-to-line voltage of the power supply lines of railway signaling equipment to obtain an AC sampling signal. The data processing circuit module is used to rectify, follow, amplify, and regulate the AC sampling signal to obtain an amplified and regulated signal. The amplified and regulated signal is then converted from analog to digital and transmitted to the data center for calculation, outputting the calculation results.

2. The non-contact voltage monitoring device for railway signaling equipment according to claim 1, characterized in that, The non-contact voltage sensor is a discrete voltage sensor.

3. The non-contact voltage monitoring device for railway signaling equipment according to claim 1, characterized in that, The data processing circuit module includes a rectifier circuit, a follower circuit, an amplification and voltage regulation circuit, an analog-to-digital converter circuit, and an isolation circuit connected in sequence. The rectifier circuit is used to rectify the AC signal detected by the non-contact voltage sensor to obtain a DC sampling signal. The follower circuit is used to follow the DC sampling signal. The amplification and voltage regulation circuit is used to amplify and regulate the DC sampling signal to obtain an amplified and regulated signal. The analog-to-digital converter circuit is used to convert the analog quantity of the amplified and regulated signal into a digital quantity. The isolation circuit is used to transmit the digital quantity of the amplified and regulated signal to the data center.

4. The non-contact voltage monitoring device for railway signaling equipment according to claim 3, characterized in that, The follower circuit includes a first follower sub-circuit and a second follower sub-circuit. The input terminal of the first follower sub-circuit is connected to the output terminal of the rectifier circuit and the output terminal of the second follower sub-circuit through a first resistor. The end of the first resistor connected to the rectifier circuit serves as the input terminal of the follower circuit. The output terminal of the first follower sub-circuit is connected to the input terminal of the second follower sub-circuit and serves as the output terminal of the follower circuit.

5. A non-contact voltage monitoring device for railway signaling equipment according to claim 4, characterized in that, The first follower sub-circuit includes a first amplifier and a first diode. The positive input terminal of the first amplifier serves as the input terminal of the first follower sub-circuit, and its negative input terminal is connected to the negative terminal of the first diode and serves as the output terminal of the follower circuit. The output terminal of the first amplifier is connected to the positive terminal of the first diode.

6. A non-contact voltage monitoring device for railway signaling equipment according to claim 4, characterized in that, The second follower sub-circuit includes a second amplifier and a second diode. The positive input terminal of the second amplifier is connected to the output terminal of the first follower sub-circuit, and its negative input terminal is connected to its output terminal and the positive terminal of the second diode. The negative terminal of the second diode serves as the output terminal of the second follower sub-circuit and is connected to the input terminal of the first follower sub-circuit.

7. A non-contact voltage monitoring device for railway signaling equipment according to claim 3, characterized in that, The amplification and voltage regulation circuit includes a voltage divider circuit, an amplification sub-circuit, and a voltage regulation circuit connected in sequence. The voltage divider circuit includes a first series resistor string, which is used to divide the output voltage of the follower circuit to obtain a first voltage divider. The amplification sub-circuit includes a third amplifier, which is used to amplify the first voltage divider to obtain an amplified signal. The voltage regulation circuit includes a Zener diode, which is used to regulate the amplified signal to obtain an amplified and regulated signal.

8. A non-contact voltage monitoring device for railway signaling equipment according to claim 7, characterized in that, The amplifier sub-circuit includes a third amplifier and a second series resistor string. The positive input terminal of the third amplifier is connected to the output terminal of the voltage divider circuit, and its negative input terminal is connected to the series connection point of the second series resistor string. Its output terminal serves as the output terminal of the amplifier sub-circuit and is connected to one end of the second series resistor string. The other end of the second series resistor string is connected to analog ground.

9. A non-contact voltage monitoring device for railway signaling equipment according to claim 7, characterized in that, The voltage regulator circuit includes a third diode, a Zener diode, a second capacitor, and a seventh resistor. The negative terminal of the third diode is connected to the power supply terminal, and the positive terminal of the third diode is connected to the Zener diode's voltage regulator terminal, one end of the second capacitor, one end of the seventh resistor, and the output terminal of the amplifier sub-circuit, serving as the voltage regulator terminal of the voltage regulator circuit. The other end of the Zener diode, the other end of the second capacitor, and the other end of the seventh resistor are connected to analog ground.

10. A non-contact voltage monitoring device for railway signaling equipment according to claim 3, characterized in that, The analog-to-digital conversion circuit includes an analog-to-digital conversion chip for converting the amplified and regulated analog signal into a digital signal; the isolation circuit includes an isolation communication chip for transmitting the amplified and regulated digital signal to the data center; the data center includes a processor and a memory for processing and storing the amplified and regulated digital signal, and for outputting and / or displaying it.

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