Multi-path small-size high-precision voltage sensor

Abstract

The utility model relates to a multipath small-size high-precision voltage sensor, which comprises a shell, a PCBA assembly, a positive input high-voltage line group, a negative input high-voltage line group and at least two paths of output ports, and is characterized in that the PCBA assembly is arranged in the shell, and the positive input high-voltage line group, the negative input high-voltage line group and the multipath output ports penetrate through the shell; a plurality of voltage division detection circuits are arranged on the PCBA assembly in an integrated mode, the positive input high-voltage line set and the negative input high-voltage line set are matched with each other to form a plurality of sets of independent direct-current high-voltage input channels, and the multiple sets of direct-current high-voltage input channels are connected with the input ends of the voltage division detection circuits in a one-to-one correspondence mode. The output ends of the multi-path voltage division detection circuit are connected with the multi-path output ports in a one-to-one correspondence manner; the voltage division detection circuit divides the input direct-current high voltage in proportion and outputs a low-voltage detection signal. The device can monitor multiple paths of high voltage at the same time, and is small in size and convenient to carry; voltage detection is carried out in a proportional voltage division mode, the detection precision is high, and the environment adaptability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to high voltage detection equipment technical field, concretely relates to a kind of multi-path small volume high-precision voltage sensor. BACKGROUND

[0002] At present, in the production test and maintenance process of high-voltage electronic equipment, it is very important to accurately and quickly measure the voltage on the equipment. However, the existing voltage sensor is often large in size, which is difficult to meet the strict requirements of modern electronic equipment on space. Especially in the voltage detection scene of multiple high-voltage electronic equipment with close distance, it is very important to reduce the spatial size of the voltage sensor. In addition, the accuracy of these sensors needs to be improved to meet the growing measurement needs. Therefore, it is of great significance to develop a small-size, high-precision high-voltage detection device to improve the performance and reliability of electronic equipment. SUMMARY

[0003] Based on the above description, the utility model provides a kind of multi-path small volume high-precision voltage sensor to mainly solve the problem of large space occupied by traditional voltage detection equipment.

[0004] The technical solution of the utility model to solve the above technical problem is as follows: a kind of multi-path small volume high-precision voltage sensor, including shell, PCBA component, positive input high-voltage line group, negative input high-voltage line group and at least two-way output port, the PCBA component is set in the shell interior, the positive input high-voltage line group, negative input high-voltage line group and multi-path output port are through the shell;The PCBA component is integrally provided with a plurality of voltage division detection circuits, the positive input high-voltage line group and the negative input high-voltage line group are matched to form a plurality of independent DC high-voltage input channels, a plurality of DC high-voltage input channels are connected to the input end of the voltage division detection circuit one by one, and the output end of the voltage division detection circuit is connected to the multi-path output port one by one;The voltage division detection circuit divides the input DC high voltage by a certain proportion and outputs a low-voltage detection signal.

[0005] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects: the multi-path small volume high-precision voltage sensor provided by the utility model divides the input DC high voltage by a certain proportion through the multi-path voltage division detection circuit, and outputs a low-voltage detection signal, which can monitor multiple high-voltage at the same time, such as 10kV and above high-voltage. The voltage sensor is integrated on the PCBA component in the shell through the multi-path voltage division detection circuit, which can greatly reduce the size of the voltage sensor, reduce the space occupied by the equipment, and facilitate carrying. The voltage is detected by proportional voltage division, with high detection accuracy, which has positive significance for improving the performance and reliability of the measured electronic equipment.

[0006] On the basis of the above technical solutions, the utility model further can make improvement as follows.

[0007] Further, the shell comprises a box body and a cover plate, the box body forms an accommodation space, the cover plate is in close connection with the opening end of the accommodation space, the PCBA assembly is arranged in the accommodation space, and the accommodation space is filled with electronic potting glue.

[0008] Further, the PCBA assembly comprises a first PCBA, a second PCBA and a partition plate, the first PCBA and the second PCBA are arranged on two surfaces of the partition plate respectively, the partition plate is connected with the inner wall of the box body, and at least one voltage division detection circuit is arranged on the first PCBA and the second PCBA.

[0009] Further, a plurality of supporting columns are fixedly arranged in the box body, and the partition plate is mounted on the supporting columns.

[0010] Further, a limiting table is arranged in the box body, and the end surface of the limiting table is in abutting engagement with the partition plate.

[0011] Further, a window is arranged on the box body, and the output port is mounted in the window.

[0012] Further, a rib column is arranged on the box body.

[0013] Further, the positive input high-voltage line group comprises a plurality of positive input high-voltage lines, the negative input high-voltage line group comprises a plurality of negative input high-voltage lines, one of the positive input high-voltage lines and one of the negative input high-voltage lines jointly form one direct-current high-voltage input channel.

[0014] Further, the voltage division detection circuit comprises m first voltage division modules, n second voltage division modules and n third voltage division modules, wherein m > n, m and n are positive integers;

[0015] The positive input high-voltage line, the m first voltage division modules and the negative input high-voltage line are connected in series, the first voltage division module connected with the negative input high-voltage line serves as a detection module, and a capacitor is arranged in parallel at both ends of the detection module.

[0016] The high-voltage end of the detection module is connected with the positive output end of the output port through the n second voltage division modules arranged in series, the low-voltage end of the detection module is connected with the negative output end of the output port through the n third voltage division modules arranged in series, and the n second voltage division modules and the n third voltage division modules are arranged symmetrically at both ends of the detection module.

[0017] Further, the first voltage division module includes a plurality of first voltage division resistors arranged in parallel, the second voltage division module includes a plurality of second voltage division resistors arranged in parallel, and the third voltage division module includes a plurality of third voltage division resistors arranged in parallel, and the second voltage division resistors and the third voltage division resistors are identical. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A use scene schematic diagram of the multi-path small-size high-precision voltage sensor is provided for the embodiment of the utility model;

[0019] Figure 2 A structure schematic diagram of the multi-path small-size high-precision voltage sensor from a certain perspective is provided for the embodiment of the utility model;

[0020] Figure 3 Another structure schematic diagram of the multi-path small-size high-precision voltage sensor from a certain perspective is provided for the embodiment of the utility model;

[0021] Figure 4 An explosion structure schematic diagram of the multi-path small-size high-precision voltage sensor is provided for the embodiment of the utility model;

[0022] Figure 5 A shell structure schematic diagram is provided for the embodiment of the utility model;

[0023] Figure 6 A certain voltage division detection circuit principle schematic diagram is provided for the embodiment of the utility model.

[0024] In the drawings, the component list represented by each reference numeral is as follows:

[0025] 1, shell, 101, cover plate, 102, box body, 1021, limiting table, 1022, support column, 1023, rib column, 1024, mounting hole, 1025, positioning groove, 1026, window, 2, PCBA assembly, 201, first PCBA, 202, second PCBA, 3, partition plate, 4, positive input high-voltage line group, 5, negative input high-voltage line group, 6, output port, 601, first output port, 602, second output port, 7, screw, 8, first voltage division module, 9, second voltage division module, 10, third voltage division module, 11, detection module;

[0026] R1i / R2i, first voltage division resistor, R3j / R4j, second voltage division resistor, R5j / R6j, third voltage division resistor, C1~Ck, capacitor; H1+, first positive input high-voltage line, H2+, second positive input high-voltage line, H1-, first negative input high-voltage line, H2-, second negative input high-voltage line. DETAILED DESCRIPTION

[0027] For the purpose of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings. There can, of course, be many different forms of the application and the application should not be limited to the embodiments set forth herein. Rather, the embodiments are provided as example of the disclosure of the application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0029] It will be understood that the spatially relative terms "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device is inverted or rotated by 90 degrees, the descriptions of "below" or "under" or "beneath" an element or feature can be interpreted as "above" or "over" the element or feature. Likewise, a device can be oriented in any orientation, and the spatially relative terms used herein are interpreted accordingly. The terms "first", "second", "third", etc. can be used to describe various elements, components, regions, layers and / or sections which have the same or similar characteristics or functions.

[0030] It is to be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element, or connected to the other element with intervening elements. "Connected" in the following embodiments should be understood as "electrically connected", "communicatively connected", etc. if the circuits, modules, units, etc. connected to each other have transmission of electrical signals or data.

[0031] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "including" or "having" etc. specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0032] Please refer to Figures 1-4 Based on the defects of the existing DC high-voltage detection device, the embodiment provides a multi-channel small-size high-precision voltage sensor. In order to facilitate the illustration of the utility model, the following text takes two detection channels as an example, and more detection channels can be set based on the same idea in the actual application scene.Figure 1 The application scenario of the voltage sensor for detecting multiple high-voltage DC devices is demonstrated. Figure 1 The following example uses the detection of two high-voltage DC power supply devices for illustration, and the detection results can be displayed through the back-end display device. Figure 2 The external three-dimensional structure of the voltage sensor based on the output end perspective is shown. Figure 3 The external three-dimensional structure of the voltage sensor based on the input end perspective is shown. Figure 4 The internal structure of the voltage sensor after the housing 1 is removed is shown. Figure 5 The internal structure of the housing 1 is shown. Figure 6 The circuit principle of any voltage divider detection circuit inside the voltage sensor is demonstrated.

[0033] like Figures 1-3 As shown, this embodiment provides a multi-channel small-volume high-precision voltage sensor, including a housing 1, a PCBA assembly 2, a positive input high-voltage wire group 4, a negative input high-voltage wire group 5, and at least two output ports 6. The housing 1 is made of an insulating material, and the PCBA assembly 2 is arranged inside the housing 1. The positive input high-voltage wire group 4, the negative input high-voltage wire group 5, and the multi-channel output ports 6 pass through the housing 1; the PCBA assembly 2 is integrated with a multi-channel voltage division detection circuit, and the positive input high-voltage wire group 4 and the negative input high-voltage wire group 5 cooperate with each other to form multiple groups of independent DC high-voltage input channels. The multiple groups of DC high-voltage input channels are connected to the input ends of the multi-channel voltage division detection circuit in a one-to-one correspondence, and the output ends of the multi-channel voltage division detection circuit are connected to the multi-channel output ports 6 in a one-to-one correspondence; the voltage division detection circuit divides the input DC high voltage proportionally and outputs a low-voltage detection signal.

[0034] It is understood that the multi-channel, compact, high-precision voltage sensor provided in this embodiment uses a multi-channel voltage-dividing detection circuit to proportionally divide the DC high voltage inputs from each channel and output a low-voltage detection signal. This allows for simultaneous monitoring of multiple high voltages, such as 10kV and above. This voltage sensor, integrated onto a PCBA assembly 2 within a housing 1 via the multi-channel voltage-dividing detection circuit, significantly reduces the size of the voltage sensor, minimizing the device's footprint and making it more portable. The proportional voltage-dividing method provides high detection accuracy, significantly improving the performance and reliability of the electronic device being tested.

[0035] Based on the above technical solution, this embodiment can also be improved as follows.

[0036] In one possible implementation, Figures 2-5As shown, the shell 1 includes a box body 102 and a cover plate 101, the box body 102 forms a containing space inside, the cover plate 101 is in close connection with the opening end of the containing space; the PCBA assembly 2 is arranged in the containing space, and the containing space is filled with electronic potting glue.

[0037] It can be understood that, in the process of assembling the voltage sensor, first, the PCBA assembly 2 is installed and fixed in the containing space of the box body 102, then the positions of the positive input high-voltage line group 4, the negative input high-voltage line group 5 and the multi-output port 6 on the shell 1 are adjusted, then the electronic potting glue is filled in the containing space, and finally the cover plate 101 is connected and fixed with the box body 102 by the screw 7. The electronic potting glue in the containing space can further fix the positions of the components in the containing space, increase the structural stability and reliability of the voltage sensor, and reduce the degree of influence of the voltage sensor on the environment, so that the voltage sensor is suitable for various pressure environments.

[0038] In one possible implementation, as shown in the exploded view of Figure 4 , the PCBA assembly 2 includes a first PCBA 201, a second PCBA 202 and a partition plate 3, the first PCBA 201 and the second PCBA 202 are arranged on two sides of the partition plate 3 respectively, and the partition plate 3 is connected with the inner wall of the box body 102; the first PCBA 201 and the second PCBA 202 each have at least one voltage division detection circuit.

[0039] In one possible implementation, as shown in Figure 5 , a plurality of support columns 1022 are fixedly arranged in the box body 102, and the partition plate 3 is arranged on the support columns 1022. The plurality of support columns 1022 can support the partition plate 3 at multiple points, and the partition plate 3 can be connected with the support columns 1022 by means of bolts, screws 7, gluing, clamping and the like, so as to effectively fix the partition plate 3 and the first PCBA 201 and the second PCBA 202 in the containing space of the box body 102.

[0040] Further, the box body 102 is provided with a limiting table 1021, and the end face of the limiting table 1021 is in abutting engagement with the partition plate 3. Unlike the aforementioned support columns 1022 which support and fix the partition plate 3 at multiple points, the limiting table 1021 supports the partition plate 3 in a surface manner to limit the position of the partition plate 3, prevent the electrical elements on the PCBA assembly 2 from interfering with the inner wall of the box body 102, and at the same time reserve appropriate heat dissipation space for the electrical elements.

[0041] In combination with Figure 2 , Figure 4 and Figure 5As shown, the box body 102 is provided with a plurality of windows 1026, and the output ports 6 are installed in the windows 1026 one by one. The installation reliability of the output ports 6 on the box body 102 can be improved, and the electrical safety distance between the output ports 6 can be ensured by setting the distance between the windows 1026, so as to prevent the low-voltage detection signals output by the adjacent output ports 6 from interfering with each other, and improve the working safety and reliability of the voltage sensor.

[0042] In combination Figures 2-5 As shown, the box body 102 is provided with a plurality of windows 1026, and the output ports 6 are installed in the windows 1026 one by one. The installation reliability of the output ports 6 on the box body 102 can be improved, and the electrical safety distance between the output ports 6 can be ensured by setting the distance between the windows 1026, so as to prevent the low-voltage detection signals output by the adjacent output ports 6 from interfering with each other, and improve the working safety and reliability of the voltage sensor.

[0043] In one possible implementation, as shown in Figures 1-4 As shown, the positive input high-voltage line group 4 includes a plurality of positive input high-voltage lines, such as a first positive input high-voltage line H1+ and a second positive input high-voltage line H2+. The negative input high-voltage line group 5 includes a plurality of negative input high-voltage lines, such as a first negative input high-voltage line H1- and a second negative input high-voltage line H2-. In this embodiment, two DC high-voltage input channels are provided, wherein the first positive input high-voltage line H1+ and the first negative input high-voltage line H1- together form a first DC high-voltage input channel, and the second positive input high-voltage line H2+ and the second negative input high-voltage line H2- together form a second DC high-voltage input channel. Correspondingly, the output port 6 includes a first output port 601 and a second output port 602, and the PCBA assembly 2 is provided with two voltage division detection circuits (a voltage division detection circuit on the first PCBA 201 and a voltage division detection circuit on the second PCBA 202). The first output port 601, the voltage division detection circuit on the first PCBA 201, and the first DC high-voltage input channel correspond to each other, and the second output port 602, the voltage division detection circuit on the second PCBA 202, and the second DC high-voltage input channel correspond to each other.

[0044] In one possible implementation, the topological structure of each voltage division detection circuit is the same. As shown in Figure 6As shown, the single voltage division detection circuit includes m first voltage division modules 8 connected in series, n second voltage division modules 9 connected in series, and n third voltage division modules 10 connected in series, m represents the number of first voltage division modules 8, n represents the number of second voltage division modules 9 or the number of third voltage division modules 10, that is, the number of second voltage division modules 9 and the number of third voltage division modules 10 are both n, wherein m and n are positive integers, m≥2, preferably m>n.

[0045] The positive input high voltage line, the m first voltage division modules 8, and the negative input high voltage line are connected in series to form a proportional voltage division circuit. For example, the positive input high voltage line is connected to the high voltage end HV+ of the first voltage division module 8 Figure 6 The negative input high voltage line is connected to the low voltage end HV- of the m first voltage division modules 8 Figure 6 The negative input high voltage line is grounded at the low voltage end HV- of the m first voltage division modules 8. The first voltage division module 8 connected to the negative input high voltage line serves as a detection module 11, and capacitors C1-Ck are connected in parallel across the detection module 11, where k is the number of capacitors, and k is a positive integer.

[0046] For example, the voltage between the positive input high voltage line and the negative input high voltage line is 10kV. In the 10kV high voltage detection scenario which is difficult to detect, the m first voltage division modules 8 proportionally divide the 10kV high voltage, and the voltage on a single first voltage division module 8 is greatly reduced after voltage division. By detecting the voltage change on a single first voltage division module 8 (such as the detection module 11), the voltage change between the positive input high voltage line and the negative input high voltage line can be calculated proportionally. According to the current flow direction, the last (mth) first voltage division module 8 is set as the detection module 11, and due to the current limiting effect of the m-1 first voltage division modules 8 in front of it, the impact of the surge current on the subsequent circuit when the voltage sensor is connected to the measured high voltage direct current device can be reduced. Capacitors C1-Ck are connected in parallel to each other, and capacitors C1-Ck are connected in parallel to the detection module 11, which can be used to filter high-frequency noise in the detection voltage signal.

[0047] The high voltage end of the detection module 11 is connected to the positive output end LV+ of the output port 6 through the n second voltage division modules 9 connected in series, and the low voltage end of the detection module 11 is connected to the negative output end LV- of the output port 6 through the n third voltage division modules 10 connected in series. The positive output end LV+ and the negative output end LV- of the output port 6 are connected to subsequent related measurement devices, such as Figure 1 The display device shown is used to display the detection results. The n second voltage division modules 9 and the n third voltage division modules 10 are symmetrically arranged across the detection module 11, which is used to further divide and adjust the low voltage detection signal output by the detection module 11, so as to obtain a low voltage detection signal that matches the parameters of the subsequent related measurement devices.

[0048] As Figure 6 shown, the first voltage division module 8 includes a plurality of first voltage division resistors arranged in parallel, the second voltage division module 9 includes a plurality of second voltage division resistors arranged in parallel, and the third voltage division module 10 includes a plurality of third voltage division resistors arranged in parallel. In this embodiment, the first voltage division module 8, the second voltage division module 9 and the third voltage division module 10 are all illustrated by way of example in a manner that two voltage division resistors are arranged in parallel. For example Figure 6 shown, the first voltage division module 8 includes a plurality of first voltage division resistors arranged in parallel, the second voltage division module 9 includes a plurality of second voltage division resistors arranged in parallel, and the third voltage division module 10 includes a plurality of third voltage division resistors arranged in parallel. In this embodiment, the first voltage division module 8, the second voltage division module 9 and the third voltage division module 10 are all illustrated by way of example in a manner that two voltage division resistors are arranged in parallel. For example Figure 6 shown, the second voltage division module 9 includes a second voltage division resistor R3j and a second voltage division resistor R4j, and the third voltage division module 10 includes a third voltage division resistor R5j and a third voltage division resistor R6j, j being the serial number of the second voltage division module 9 and the serial number of the third voltage division module 10, j∈[1,n]. Preferably, the parameters of the second voltage division resistors and the third voltage division resistors are the same.

[0049] It can be understood that, since the rated power of a resistor is limited, that is, its current overload capacity is limited, each voltage division module adopts a plurality of resistors arranged in parallel, which can reduce the power borne by each resistor, that is, each voltage division module can be shunted to enhance the overload capacity of each voltage division module and avoid being broken down by inrush current. At the same time, the error of the combined resistance of each voltage division module can be reduced by arranging a plurality of resistors in parallel, and the detection accuracy can be improved.

[0050] Further, the first voltage division resistors, the second voltage division resistors and the third voltage division resistors can be preferably implemented by using one-tenth-precision chip resistors, and a plurality of one-tenth-precision chip resistors are used for voltage division, so that the sampling accuracy can reach more than one thousandth, and the overall detection accuracy of the system is improved.

[0051] The voltage sensor provided by the utility model can monitor multiple high voltages, such as 10kV and above high voltages, at the same time. The voltage sensor is integrated on the PCBA assembly 2 in the same shell 1 through the multi-voltage division detection circuit, so that the size of the voltage sensor can be greatly reduced, the space occupied by the equipment can be reduced, and the voltage sensor is convenient to carry. The high-voltage direct-current voltage is detected through the resistance proportional voltage division mode, the detection accuracy is high, and the performance and reliability of the measured electronic equipment are improved.

[0052] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-channel, small volume, high precision voltage sensor, characterized in that, The application relates to a high-voltage DC power supply, which comprises a shell (1), a PCBA assembly (2), a positive input high-voltage line group (4), a negative input high-voltage line group (5) and at least two output ports (6), the PCBA assembly (2) is arranged in the shell (1), the positive input high-voltage line group (4), the negative input high-voltage line group (5) and the multiple output ports (6) penetrate through the shell (1), multiple voltage division detection circuits are integrated on the PCBA assembly (2), the positive input high-voltage line group (4) and the negative input high-voltage line group (5) cooperatively form multiple groups of independent DC high-voltage input channels, the multiple groups of DC high-voltage input channels are connected with the input ends of the multiple voltage division detection circuits one by one, and the output ends of the multiple voltage division detection circuits are connected with the multiple output ports (6) one by one.

2. The multi-channel, small volume, high precision voltage sensor of claim 1, wherein, The shell (1) comprises a box body (102) and a cover plate (101), the box body (102) forms an accommodating space, and the cover plate (101) is in close connection with the opening end of the accommodating space; the PCBA assembly (2) is arranged in the accommodating space, and the accommodating space is filled with electronic potting adhesive.

3. The multi-channel, small volume, high accuracy voltage sensor of claim 2, wherein, The PCBA assembly (2) comprises a first PCBA (201), a second PCBA (202) and a partition plate (3), the first PCBA (201) and the second PCBA (202) are arranged on the two surfaces of the partition plate (3) respectively, and the partition plate (3) is connected with the inner wall of the box body (102); at least one voltage division detection circuit is arranged on the first PCBA (201) and the second PCBA (202) respectively.

4. The multi-channel, small volume, high accuracy voltage sensor of claim 3, wherein, A plurality of supporting columns (1022) are fixedly arranged in the box body (102), and the partition plate (3) is mounted on the supporting columns (1022).

5. The multi-channel small volume high precision voltage sensor according to claim 3 or 4, characterized in that, A limiting table (1021) is arranged in the box body (102), and the end surface of the limiting table (1021) is in abutting engagement with the partition plate (3).

6. The multi-channel small volume high precision voltage sensor according to any one of claims 2-4, characterized in that, A window (1026) is arranged on the box body (102), and the output port (6) is mounted in the window (1026).

7. The multi-channel small volume high precision voltage sensor according to any one of claims 2-4, characterized in that, A rib column (1023) is arranged on the box body (102).

8. The multi-channel, small volume, high accuracy voltage sensor of claim 1, wherein, The positive input high-voltage line group (4) comprises a plurality of positive input high-voltage lines, the negative input high-voltage line group (5) comprises a plurality of negative input high-voltage lines, and one positive input high-voltage line and one negative input high-voltage line jointly form one DC high-voltage input channel.

9. The multi-channel, small volume, high accuracy voltage sensor of claim 8, wherein, The voltage division detection circuit comprises m first voltage division modules (8), n second voltage division modules (9) and n third voltage division modules (10), wherein m>n, m and n are positive integers; The positive input high-voltage line, the m first voltage division modules (8) and the negative input high-voltage line are connected in series, a first voltage division module (8) connected with the negative input high-voltage line serves as a detection module (11), and a capacitor is arranged in parallel at the two ends of the detection module (11). The high voltage end of the detection module (11) is connected with the positive output end of the output port (6) through n second voltage division modules (9) arranged in series, and the low voltage end of the detection module (11) is connected with the negative output end of the output port (6) through n third voltage division modules (10) arranged in series; n second voltage division modules (9) and n third voltage division modules (10) are symmetrically arranged at both ends of the detection module (11).

10. The multi-channel, small volume, high accuracy voltage sensor of claim 9, wherein, The first voltage division module (8) comprises a plurality of first voltage division resistors arranged in parallel, the second voltage division module (9) comprises a plurality of second voltage division resistors arranged in parallel, the third voltage division module (10) comprises a plurality of third voltage division resistors arranged in parallel, and the second voltage division resistors and the third voltage division resistors are the same.

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