High-isolation voltage sensor

Abstract

The invention relates to the technical field of power sensors, in particular to a high-isolation voltage sensor which comprises an insulating shell and an isolation assembly arranged in the insulating shell. A pretreatment assembly and a post-treatment assembly are arranged on the two sides of the insulating shell respectively; the preprocessing assembly is used for adjusting the gain of an input signal to a linear working area; and the post-processing component is used for reducing nonlinearity of the output signal. According to the invention, light transmission is carried out in a light insulation and insulation epoxy sealing environment, so that interference of external light can be effectively prevented, and the purity of signals is ensured. Meanwhile, the sealing environment is also beneficial for realizing high-voltage physical insulation, and the safety and the stability of the system are ensured. And the insulation grade of 50KV can be reached, which means that the device can normally work in ultrahigh voltage-withstanding occasions such as a high-voltage high-isolation power supply, and safe and stable operation of an electric power system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power sensors, in particular to a high isolation voltage sensor. Background Art

[0002] In view of the fact that electronic circuits are often required to provide sampling signals from a closed loop in automatic control, that is, to take out a part of the execution results of the original parameters and feed them back to the input end (commonly known as negative feedback), and make appropriate judgments and corrections based on the mutual comparison between the two to ensure that the final execution results meet our needs and achieve the ideal results.

[0003] In fact, there are some constraints in the design. For example, due to the potential difference between the primary and secondary caused by certain working conditions, it is easy to cause high voltage breakdown of the transformer or device. The highest withstand voltage level of the photocoupler currently available in the market is only 7.5KV, which is far from the 50KV required by the radiation. In order to avoid damage to the original device and circuit during the transmission of feedback information, we designed a high-isolation sensor. Summary of the invention

[0004] The object of the present invention is to provide a high isolation voltage sensor to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high isolation voltage sensor comprises an insulating shell and an isolation component arranged inside the insulating shell; a pre-processing component and a post-processing component are respectively arranged on both sides of the insulating shell; the pre-processing component is used to adjust the input signal gain to a linear working area; the post-processing component is used to reduce the nonlinearity of the output signal.

[0007] Preferably, the preprocessing component includes a shell 1 and a power supply 1, an amplifier circuit 1, a linear compensation circuit, and an electro-optical conversion module arranged in the shell 1, the output end of the amplifier circuit 1 is connected to the linear compensation circuit, the output end of the linear compensation circuit is connected to the input end of the electro-optical conversion module, the output end of the electro-optical conversion module passes through the shell 1 and is connected to the isolation component, and the power supply 1 is connected to the electro-optical conversion module.

[0008] Preferably, the isolation component comprises a light-conducting crystal rod and an epoxy insulating layer, one end of the light-conducting crystal rod is connected to the electro-optical converter, and the light-conducting crystal rod is located in the epoxy insulating layer.

[0009] Preferably, the post-processing component includes a shell 2 and a power supply 2, a single-chip microcomputer, a photoelectric conversion module and an amplifier circuit arranged in the shell, the power supply 2 is connected to the single-chip microcomputer, the photoelectric conversion module is connected to the amplifier circuit, the amplifier circuit is connected to the single-chip microcomputer, and the end of the photoconductive crystal rod away from the electro-optical conversion module is connected to the photoelectric conversion module.

[0010] Preferably, an input-output module and a communication module are arranged on the outside of the insulating shell, the communication module and the input-output module are respectively connected to the single-chip microcomputer, and the input-output module includes a display screen and a control keyboard.

[0011] Preferably, both the first shell and the second shell are filled with epoxy resin.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention converts the collected voltage or current signal through a preprocessing component and converts it into an optical signal. This step is to utilize the high speed, large capacity and strong anti-interference ability of optical fiber communication technology to improve the quality and reliability of signal transmission. The optical signal will pass through the optical crystal rod installed in the insulating shell. This optical crystal rod has excellent optical properties and can effectively transmit the optical signal to the post-processing component. During the transmission process, the transmission of light is carried out in a light-proof insulating epoxy sealed environment, which can effectively prevent interference from external light and ensure the purity of the signal. At the same time, this sealed environment also helps to achieve high-voltage physical insulation and ensure the safety and stability of the system. The insulation level can reach up to 50KV, which means that it can work normally in ultra-high withstand voltage occasions such as high-voltage and high-isolation power supplies to ensure the safe and stable operation of the power system.

[0014] 2. In the present invention, when the optical signal reaches the post-processing component, the post-processing component will convert the received optical signal into an electrical signal. This process is completed by a photoelectric converter, which can accurately restore the optical signal to the original electrical signal. Then, these electrical signals will be sent to the single-chip microcomputer for processing. The single-chip microcomputer is a microcomputer with powerful data processing capabilities and can analyze and process electrical signals in real time. Through the processing of the single-chip microcomputer, we can generate corresponding numbers, which represent the specific values ​​of the original voltage or current signal. These numbers will be displayed on the display screen for the operator or the monitoring system to view and analyze. In this way, we can monitor the operating status of the power system in real time, detect abnormal conditions in time and take corresponding measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the principle of the sensor of the present invention;

[0016] Figure 2This is a schematic diagram of the sensor structure of the present invention.

[0017] In the accompanying drawings: insulating shell 1, isolation component 2, pre-processing component 3, post-processing component 4, optical crystal rod 201, shell 1 301, power supply 1 302, amplifier circuit 1 303, linear compensation circuit 304, electro-optical conversion module 305, shell 2 401, power supply 2 402, single-chip computer 403, photoelectric conversion module 404, amplifier circuit 2 405. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] refer to Figure 1-2 The present invention provides a technical solution: a high isolation voltage sensor, comprising an insulating shell 1 and an isolation component 2 installed inside the insulating shell 1; a pre-processing component 3 and a post-processing component 4 are respectively installed on both sides of the insulating shell 1; the pre-processing component 3 is used to adjust the input signal gain to the linear working area; the pre-processing component 3 comprises a shell 301 and a power supply 302, an amplifier circuit 303, a linear compensation circuit 304, and an electro-optical conversion module 305 installed in the shell 301, the output end of the amplifier circuit 303 is connected to the linear compensation circuit 304, the output end of the linear compensation circuit 304 is connected to the input end of the electro-optical conversion module 305, the output end of the electro-optical conversion module 305 passes through the shell 301 and is connected to the isolation component 2, and the power supply 302 is connected to the electro-optical conversion module 305.

[0021] The post-processing component 4 is used to reduce the nonlinearity of the output signal. The post-processing component 4 includes a second housing 401 and a second power supply 402, a single-chip computer 403, a photoelectric conversion module 404 and a second amplifier circuit 405 installed in the second housing 401. The second power supply 402 is connected to the single-chip computer 403, the photoelectric conversion module 404 is connected to the second amplifier circuit 405, the second amplifier circuit 405 is connected to the single-chip computer 403, and the end of the optical crystal rod 201 away from the electro-optical conversion module 305 is connected to the photoelectric conversion module 404.

[0022] The isolation component 2 includes a light-conducting crystal rod 201 and an epoxy insulating layer. One end of the light-conducting crystal rod 201 is connected to the electro-optical converter, and the light-conducting crystal rod 201 is located in the epoxy insulating layer.

[0023] An input-output module and a communication module are installed outside the insulating housing 1. The communication module and the input-output module are connected to the single-chip computer 403 respectively. The input-output module includes a display screen and a control keyboard.

[0024] The first shell 301 and the second shell 401 are both filled with epoxy resin.

[0025] Working principle: The signal is amplified, filtered and adjusted as necessary by the pre-processing component 3 to meet the subsequent photoelectric conversion requirements. This step ensures the clarity and accuracy of the signal. The pre-processed electrical signal is converted into an optical signal by a photoelectric conversion module 404. This photoelectric conversion module 404 must have high linearity to ensure the accuracy of the signal. The optical signal is transmitted through the optical crystal rod 201 installed in the insulating housing 1. The optical crystal rod 201 is made of high-purity optical materials and can effectively transmit optical signals with almost no loss of brightness or clarity. The post-processing component 4 receives the optical signal transmitted through the optical crystal rod 201 and restores the optical signal to an electrical signal. The electrical signal is then sent to the microcontroller 403 for processing, which may include steps such as analog-to-digital conversion, calibration, and temperature compensation. The processed digital signal is finally displayed on a display screen connected to the microcontroller 403 for operator monitoring.

[0026] All optoelectronic components in the system are installed in a light-proof insulating epoxy sealed environment. This material can effectively prevent the influence of the external environment on the optical path while ensuring an insulation level of up to 50KV.

[0027] Taking into account the particularity of the high-voltage environment, the system design should include multiple safety measures such as overvoltage protection, transient voltage suppression and reverse polarity protection to ensure the stability and long-term operation of the equipment.

[0028] The function of the pre-processing component 3 is to adjust the gain and adjust the optical drive signal to the linear working area. The main process is: the collected signal voltage and current are amplified, linearly corrected by the linear compensation circuit 304, and then the electro-optical conversion module 305 is driven to generate an optical signal. The function of the post-processing component 4 is to convert the optical signal into an electrical signal, and perform error correction and compensation through the single-chip microcomputer 403, so that the nonlinearity generated in the photoelectric conversion process is minimized.

[0029] The communication module can realize data connection between multiple sensors. By operating one sensor, the data of transformers at other locations measured by other sensors can be obtained, and the obtained data can be displayed on the display screen.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high isolation voltage sensor, characterized in that: The invention comprises an insulating shell (1) and an isolation component (2) arranged inside the insulating shell (1); a pre-processing component (3) and a post-processing component (4) are respectively arranged on both sides of the insulating shell (1); the pre-processing component (3) is used to adjust the input signal gain to a linear working area; and the post-processing component (4) is used to reduce the nonlinearity of the output signal.

2. A high isolation voltage sensor according to claim 1, characterized in that: The pre-processing component (3) comprises a housing (301) and a power supply (302), an amplifier circuit (303), a linear compensation circuit (304), and an electro-optical conversion module (305) arranged in the housing (301); the output end of the amplifier circuit (303) is connected to the linear compensation circuit (304); the output end of the linear compensation circuit (304) is connected to the input end of the electro-optical conversion module (305); the output end of the electro-optical conversion module (305) passes through the housing (301) and is connected to the isolation component (2); and the power supply (302) is connected to the electro-optical conversion module (305).

3. The high isolation voltage sensor according to claim 1, characterized in that: The isolation component (2) comprises a light-conducting crystal rod (201) and an epoxy insulation layer, one end of the light-conducting crystal rod (201) is connected to an electro-optical converter, and the light-conducting crystal rod (201) is located in the epoxy insulation layer.

4. A high isolation voltage sensor according to claim 2, characterized in that: The post-processing component (4) comprises a second housing (401) and a second power supply (402), a single-chip computer (403), a photoelectric conversion module (404) and a second amplifier circuit (405) arranged in the second housing (401); the second power supply (402) is connected to the single-chip computer (403); the photoelectric conversion module (404) is connected to the second amplifier circuit (405); the second amplifier circuit (405) is connected to the single-chip computer (403); and one end of the optical waveguide crystal rod (201) away from the electro-optical conversion module (305) is connected to the photoelectric conversion module (404).

5. The high isolation voltage sensor according to claim 4, characterized in that: An input / output module and a communication module are arranged outside the insulating housing (1); the communication module and the input / output module are respectively connected to the single-chip computer (403); and the input / output module comprises a display screen and a control keyboard.

6. The high isolation voltage sensor according to claim 4, characterized in that: The first shell (301) and the second shell (401) are both filled with epoxy resin.

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