Power supply signal monitoring and protecting system

Abstract

The invention discloses a power signal monitoring and protecting system, and relates to the technical field of high-power power supply. According to the power signal monitoring and protection system, a high-speed signal conditioning mode based on A / D conversion and D / A conversion is adopted for signal collection, a detection threshold value is remotely configured through an upper computer, a high-voltage side fault detection threshold value is adjusted in real time, and the problems that in a traditional system, threshold value adjustment is inconvenient, and the signal collection bandwidth is limited are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-power power supply, and in particular to a power supply signal monitoring and protection system. Background Art

[0002] As a key device for achieving controlled nuclear fusion reactions, the tokamak device's core challenge lies in confining and heating high-temperature plasma to fusion ignition conditions. In addition to relying on ohmic heating, this process also requires the introduction of multiple high-power auxiliary heating systems (such as neutral beam injection and radio frequency heating) to elevate the plasma temperature. These auxiliary heating systems must be powered by a high-power, high-voltage power supply. This power supply typically consists of multiple rectifier modules connected in series, which adjust the module output in real time to produce high-voltage waveforms of varying amplitudes and frequencies. During this process, the stable output capability of the high-voltage power supply is directly related to the safety, stability, and control efficiency of the device's operation. Therefore, accurate monitoring of the high-voltage power supply signal and effective fault protection measures are crucial to the device's operation.

[0003] Currently, signal measurement and fault protection for high-voltage power supplies are primarily achieved by configuring a separate measurement and protection circuit for each high-voltage power supply. These protection circuits are typically deployed near the high-voltage power supply area. While this design shortens signal transmission distances, the fact that personnel are prohibited from entering the high-voltage area during operation prevents the protection system's thresholds (such as overcurrent and overvoltage thresholds) from being adjusted in real time to meet operating conditions, severely limiting the system's dynamic response and flexibility. Furthermore, existing signal acquisition systems are mostly based on voltage-to-frequency (VF) or frequency-to-voltage (FV) conversion technologies, and their effective bandwidth is typically limited to low frequencies (typically below 10 kHz). As tokamaks increasingly demand high-frequency modulation capabilities for high-voltage power supplies (e.g., pulse operation in the hundreds of kHz range), the insufficient bandwidth of traditional acquisition systems will lead to signal distortion and latency, compromising the real-time and accurate performance of fault detection.

[0004] In summary, the existing high-voltage power signal measurement and protection system has the following technical defects: (1) The protection threshold cannot be adjusted online: The tight coupling design between the protection circuit and the high-voltage power supply limits the dynamic optimization of the protection parameters during operation, making it difficult to adapt to changes in complex working conditions; (2) Limited signal acquisition bandwidth: The acquisition system based on voltage-frequency / frequency-voltage conversion is difficult to meet the signal measurement requirements of high-frequency and high-voltage output, which restricts the improvement of power supply performance and rapid fault diagnosis.

[0005] Therefore, there is an urgent need to develop a high-voltage power supply measurement and protection system that supports real-time adjustable thresholds and has high-bandwidth signal acquisition capabilities to improve the reliability and adaptability of the tokamak device's power supply system. Summary of the Invention

[0006] The present invention provides a power supply signal monitoring and protection system to solve the problems that the existing system cannot adjust the protection threshold online, has insufficient signal acquisition bandwidth, and cannot meet the requirements of accurate monitoring and fault diagnosis of high-power and high-voltage power supplies.

[0007] The present invention is implemented through the following technical solution: providing a power signal monitoring and protection system, comprising: a first conversion module, configured to perform a first processing on a monitoring signal collected from the high-voltage power supply, wherein the first processing includes buffer filtering processing, and the monitoring signal includes a voltage signal and / or a current signal; a high-speed signal conditioning module, configured to perform a second processing on the monitoring signal after the first processing, wherein the second processing includes: first performing analog-to-digital conversion and then performing digital-to-analog conversion; a fault protection module, communicating with a host computer, configured to locally configure a detection threshold according to configuration information received from the host computer, compare the monitoring signal after the first processing with the detection threshold, and output a fault signal according to the comparison result; a control module, configured to output a control signal according to the fault signal to cut off the high voltage power supply; A signal acquisition module is used to acquire the fault detection signal and the monitoring signal after the second processing.

[0008] The present invention addresses the shortcomings of existing power supply monitoring and fault protection systems for high-voltage power supplies operating with high-frequency modulation, and adopts a high-speed signal conditioning method based on analog-to-digital (A / D) and digital-to-analog (D / A) conversion for signal acquisition, which has a higher acquisition bandwidth. By performing buffering and filtering on the acquired signals, the stability of signal transmission and the anti-interference capability of the system are significantly improved, while also protecting the safety of subsequent circuits and improving the accuracy of fault detection. For the protection system, the detection threshold is remotely configured using the host computer, and the high-voltage side fault detection module can be set in real time. Through the communication connection with the protection end that performs power outage, a real-time response is made to various faults, and the power supply is cut off in time, thereby ensuring the power supply safety of the high-power high-voltage power supply.

[0009] In one embodiment, the first conversion module is further configured to perform a third process on the monitoring signal after the first process, the third process comprising a voltage-frequency conversion process; The control module is further configured to receive the monitoring signal that has undergone the third processing, and output a control signal to cut off the high-voltage power supply according to the monitoring signal that has undergone the third processing.

[0010] In one embodiment, the system further includes a second conversion module, the second conversion module being configured to perform a fourth process on the monitoring signal that has undergone the third process, the fourth process including a frequency-voltage conversion process; The signal acquisition module is further configured to acquire the monitoring signal that has undergone the fourth processing.

[0011] In one embodiment, The first conversion module includes a buffer circuit, a voltage-frequency conversion circuit, a first input terminal, a first output terminal, a second output terminal, a third output terminal and a fourth output terminal; The first input terminal receives a monitoring signal collected from the high voltage power supply; The buffer circuit is connected to the first input terminal and is configured to perform the first processing on the monitoring signal; The first output end is used to transmit the monitoring signal after the first processing to the high-speed signal conditioning module, and the second output end is used to transmit the monitoring signal after the first processing to the fault protection module; The voltage-frequency conversion circuit is connected in series with the buffer circuit, and is used to perform the third processing on the monitoring signal that has undergone the first processing; The third output terminal is used to transmit the monitoring signal after the third processing to the second conversion circuit, and the fourth output terminal is used to transmit the monitoring signal after the third processing to the control module; The first input end, the first output end, and the second output end use BNC interfaces, and the third output end and the fourth output end use HFBR interfaces.

[0012] In one embodiment, the first conversion module and the second conversion module are connected via an optical fiber.

[0013] In one embodiment, the voltage-frequency conversion circuit uses an AD650 isolation chip.

[0014] In one embodiment, the fault protection module includes a local threshold deployment submodule and a fault detection submodule, and the local threshold deployment submodule and the fault detection submodule are connected via a transmission data line and a clock line; The local threshold deployment submodule communicates with the host computer and is used to locally configure the detection threshold according to the configuration information received from the host computer; and Sending the detection threshold to the fault detection submodule via the transmission data line and the clock line; The fault detection submodule includes a D / A conversion circuit, which is used to convert the sent detection threshold into an analog detection threshold, compare the first processed monitoring signal with the analog detection threshold, and output a fault signal according to the comparison result.

[0015] In one embodiment, the fault protection module further includes a high-voltage side voltage-frequency conversion box and a low-voltage side frequency-voltage conversion box; the local threshold deployment submodule further includes a check submodule; The fault detection submodule and the high-voltage side voltage-frequency conversion box are located on the high-voltage side, and the local threshold deployment submodule, the low-voltage side frequency-voltage conversion box and the host computer are located on the low-voltage side; The analog detection threshold in the fault detection submodule is converted into a frequency signal by the high-voltage side frequency-voltage conversion box, then restored by the low-voltage side frequency-voltage conversion box, and finally retrieved by the verification submodule. The verification submodule compares the analog detection threshold with the issued detection threshold to determine whether the issuance is successful.

[0016] In one embodiment, the fault detection submodule includes an overvoltage detection submodule and an overcurrent detection submodule, and the detection threshold includes a voltage detection threshold and a current detection threshold; The overvoltage detection submodule includes a first comparison circuit, configured to compare the voltage signal after the first processing with the voltage detection threshold, and output an overvoltage signal according to the comparison result; The overcurrent detection submodule includes a second comparison circuit, which is used to compare the current signal after the first processing with the current detection threshold, and output an overcurrent signal according to the detection result.

[0017] In one embodiment, the high-speed signal conditioning module includes a high-speed A / D conversion circuit and a high-speed D / A conversion circuit; The high-speed A / D conversion circuit is located on the high-voltage side, the high-speed D / A conversion circuit is located on the low-voltage side, and the high-speed A / D conversion circuit and the high-speed D / A conversion circuit are connected via an optical fiber.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: The power signal monitoring and protection system of the present invention solves the problems of inconvenient threshold adjustment and limited signal acquisition bandwidth in traditional systems by integrating a high-speed signal conditioning module, a fault protection module, a control module and a signal acquisition module. The high-speed signal conditioning module based on A / D and D / A conversion collects the output signal of the high-voltage power supply with high-frequency modulation, which has better acquisition effect for transient waveforms such as power supply overcurrent; While retaining the traditional signal acquisition technology based on voltage-frequency conversion (VF) or frequency-voltage conversion (FV), a high-speed signal conditioning module is added to take into account both high-power high-voltage power supply and general high-voltage power supply applications; The system is compatible with voltage and current measurement and protection, and has integrated software and hardware protection, data calculation and transmission functions. The entire device is highly safe and reliable, with diverse functions and flexibility. A modular isolation design between power supply and signal, measurement and protection is achieved, which improves the reliability of devices in complex high-voltage environments and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings: Figure 1 This is a structural diagram of a power signal measurement and protection system according to an embodiment of the present invention; Figure 2 It is a structural diagram of the power signal measurement and protection system implemented in a compatible application scenario; Figure 3 This is a schematic structural diagram of a fault protection module according to an embodiment of the present invention; Figure 4 This is a schematic structural diagram of a fault protection module compatible with multiple signals according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to or inherent in other steps or units of the device.

[0022] The terms used in the various embodiments of the present invention are only used for the purpose of describing specific embodiments and are not intended to limit the various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise specified, all terms used herein (including technical terms and scientific terms) have the same meaning as those commonly understood by those skilled in the art to which the various embodiments of the present invention belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present invention.

[0023] An embodiment of the present invention provides a power supply signal monitoring and protection system suitable for signal monitoring, fault detection and protection of high-power high-voltage power supplies, which solves the shortcomings of existing voltage monitoring and protection systems applied to high-power high-voltage power supplies, can collect signals with a wider frequency band, and realize online adjustment of detection thresholds.

[0024] The power signal monitoring and protection system of the present invention is applied to high-power high-voltage power supply and general high-voltage power supply, see Figure 1 As shown, the system includes a first conversion module 1 , a high-speed signal conditioning module 2 , a fault protection module 3 , a control module 4 and a signal acquisition module 5 .

[0025] Various monitoring signals collected from the high-voltage power supply are first input into the first conversion module 1. These monitoring signals include typical voltage and current signals, as well as other signals indicative of the power supply's operating status. When applied to high-power, high-voltage power supplies, the first conversion module 1 primarily performs a first processing function, namely, performing a first processing operation on the monitoring signals collected from the high-power, high-voltage power supply. This first processing primarily involves buffering and filtering the collected signals through a buffer circuit. When also applied to general high-voltage power supplies, the first conversion module 1 also includes a third processing function: voltage-to-frequency conversion, equivalent to existing systems based on voltage-to-frequency (VF) or frequency-to-voltage (FV) technologies.

[0026] First, the effects of the first conversion module 1 and other modules and their interaction will be described in terms of the application of high-power and high-voltage power supply.

[0027] The input of the first conversion module 1 is connected to a signal acquisition sensor, such as the output of a high-frequency voltage divider or current sensor. The voltage and current signals of the high-voltage power supply are collected by the high-frequency voltage divider and current sensor, respectively. The first conversion module 1 receives this high-frequency information through its first input. The inputs of the high-speed signal conditioning module 2 and the fault protection module 3 are respectively connected to the two outputs of the first conversion module 1, receiving these monitoring signals after filtering by the buffer circuit.

[0028] In the high-speed signal conditioning module 2, the received signal undergoes a second processing. The second processing mainly includes analog-to-digital conversion (A / D) followed by digital-to-analog conversion (D / A). The output signal of the high-voltage power supply under high-frequency modulation operation, acquired based on A / D and D / A conversion, has a higher acquisition bandwidth and better acquisition effect for transient waveforms such as power supply overcurrent, thereby improving fault diagnosis efficiency. A signal acquisition module 5 is connected after the high-speed signal conditioning module 2, and the signals after A / D and D / A conversion are transmitted to the signal acquisition module 5 to complete the acquisition of the monitoring signal.

[0029] In the fault protection module 3, fault detection is performed on the received signal. The actual signal is compared with a detection threshold. If the actual signal exceeds the detection threshold (the monitored current exceeds the current detection threshold, and the monitored voltage exceeds the voltage detection threshold), a fault is detected. For current and voltage detection, overvoltage / overcurrent faults are generally detected through threshold comparison. When a fault is detected, the fault protection module 3 outputs a fault signal (overvoltage signal, overcurrent signal), which drives the control module 4 to execute the power-off operation. The control module 4 outputs a corresponding control signal to disconnect the high-voltage power supply. Simultaneously, the fault protection module 3 sends the fault signal to the signal acquisition module 5 to complete the acquisition of fault signals such as overvoltage and overcurrent. A digital measurement module 6 can be included in the fault signal acquisition path, and the signal is sent to the signal acquisition module 5 through photoelectric conversion. The signal acquisition module 5 acquires analog and digital signals from various high-voltage power supplies for recording and comprehensive analysis. Personnel at the acquisition system end can read the waveforms in real time for more accurate detection data analysis and fault diagnosis.

[0030] Fault protection module 3 communicates remotely with the host computer. Configuration information can be sent from the host computer to remotely configure the detection threshold in fault protection module 3. This allows for online adjustment of the detection threshold on the low-voltage side, resolving the issue of inability to adjust the monitoring threshold online. This allows for dynamic optimization of protection parameters and adapts to complex operating conditions, such as the plasma heating phase and steady-state maintenance phase, avoiding false triggering or protection delays caused by fixed thresholds. Furthermore, the host computer threshold configuration system is located in the low-voltage area, isolated from the high-voltage power supply area and fault detection, improving operational safety for personnel.

[0031] During implementation, personnel shall perform the following steps: (1) The output end of the high-frequency voltage divider / current sensor is connected to the input end of the first processing module 1. The voltage and current signals of the high-voltage power supply operating with high-frequency modulation are cached and filtered, and converted into A / D and D / A in the high-speed signal conditioning module 2 before entering the signal acquisition module 5. Personnel read the waveform in real time at the acquisition end.

[0032] (2) Personnel send voltage and current protection thresholds in the upper computer threshold configuration system of the fault protection system. When the power output parameters are higher than the sent thresholds, the control system receives overvoltage and overcurrent signals and cuts off the power module to achieve the protection function.

[0033] In one embodiment, the high-speed signal conditioning module 2 includes a high-speed A / D conversion circuit and a high-speed D / A conversion circuit. The high-speed A / D conversion circuit is located on the high-voltage side, and the high-speed D / A conversion circuit is located on the low-voltage side. The high-speed A / D conversion circuit and the high-speed D / A conversion circuit are connected by an optical fiber. In the high-speed signal conditioning module 2, the high-voltage side high-speed A / D conversion circuit first converts the analog signal into a digital signal, which is then transmitted via optical fiber to the low-voltage side high-speed D / A conversion circuit. The digital signal is then converted into an analog signal by the high-speed D / A conversion circuit and sent to the signal acquisition module 5.

[0034] The collaborative design of optical fiber digital signal transmission (with its strong anti-interference capabilities and high transmission rate) and high-speed A / D conversion significantly increases the signal acquisition bandwidth to meet the high-frequency modulation requirements of high-voltage power supplies. The optical fiber transmission bandwidth is determined by the optical module speed, typically reaching the GHz level, while the sampling rate of the high-speed A / D converter directly determines the signal restoration accuracy. The combination of these two improves signal acquisition capabilities, ultimately enabling the waveform display to clearly identify transient processes and accurate amplitudes in high-frequency signal faults such as overcurrent.

[0035] In one embodiment, the power supply signal monitoring and protection system is compatible with the application scenarios of high-power high-voltage power supply and general high-voltage power supply, and adds a high-speed signal acquisition channel based on the existing voltage-frequency conversion V / F and frequency-voltage conversion F / V technology. Figure 2 As shown, the system includes a first conversion module 1, a second conversion module 7, a high-speed signal conditioning module 2, a fault protection module 3, a control module 4, and a signal acquisition module 5. In this embodiment, the first conversion module 1 has a third processing function, which mainly includes voltage-frequency conversion. Correspondingly, the second conversion module 7 has a fourth processing function, which mainly includes frequency-voltage conversion.

[0036] In the first conversion module 1, the buffered and filtered monitoring signal is first converted into a frequency signal via a voltage-to-frequency conversion circuit. The second conversion module 6 then performs a fourth process on the frequency signal, restoring it to a voltage signal, i.e., frequency-to-voltage conversion (F / V). Signal acquisition based on both voltage-to-frequency conversion (V / F) and frequency-to-voltage conversion (F / V) technologies is achieved through the first and second conversion modules 1 and 6, and the collected signal is then transmitted to the signal acquisition system 5.

[0037] A further improvement is to connect the first conversion module 1 and the second conversion module 6 via optical fiber. The first conversion module is located on the high-voltage side, and the second conversion module is located on the low-voltage side. The optical fiber transmission achieves electrical isolation between the high-voltage side and the low-voltage control side, avoiding the risk of high-voltage breakdown.

[0038] Specifically, the first conversion module includes a buffer circuit, a voltage-frequency conversion circuit, a first input, a first output, a second output, a third output, and a fourth output. The first, first, and second outputs utilize BNC interfaces (BNC-in, BNC-1, and BNC-2), while the third and fourth outputs utilize HFBR interfaces (HFBR-1 and HFBR-2) for efficient data transmission. The buffer circuit performs buffer filtering, while the voltage-frequency conversion circuit performs voltage-frequency conversion. The first input, BNC-in, is connected to the input of the buffer circuit to receive monitoring signals. The first and second outputs, BNC-1 and BNC-2, are connected to the output of the buffer circuit and transmit the voltage and current signals, after buffer filtering, to the high-speed signal conditioning module 2 and the fault protection module 3, respectively. The third and fourth outputs, HFBR-1 and HFBR-2, are connected to the output of the voltage-frequency conversion circuit and transmit the signals, after voltage-frequency conversion, to the second processing module and the main control module 4, respectively.

[0039] Furthermore, the main control module receives the frequency signal of the third output terminal HFBR-1 and the fault signal output by the fault protection module 3, and disconnects the high-voltage power supply according to the frequency signal and / or the fault signal. The fault signal includes but is not limited to an overcurrent signal and an overvoltage signal for real-time current and voltage detection of the high-voltage power supply, and a through-protection signal for through-detection of the power supply module.

[0040] Furthermore, the voltage-frequency conversion circuit of the first conversion module 1 is implemented by an AD650 isolation chip.

[0041] In one embodiment, the fault protection module 3 includes a local threshold deployment submodule and a fault detection submodule. Figure 3 As shown, the local threshold deployment submodule communicates with the host computer via optical fiber and features A / D conversion. It configures detection thresholds locally based on configuration information received from the host computer, performs A / D conversion on the configured detection thresholds, and then encodes and transmits them to the fault detection submodule via the transmission data and clock lines. The local threshold deployment submodule and the host computer are located on the low-voltage side, while the fault detection submodule is located on the high-voltage side. Remote configuration and distribution of detection thresholds ensures personnel safety.

[0042] The fault detection submodule includes a D / A conversion circuit and a detection circuit. The D / A conversion circuit converts the issued detection threshold into an analog detection threshold. The detection circuit compares the first processed monitoring signal with the analog detection threshold and outputs a fault signal according to the comparison result.

[0043] Among them, the configured detection thresholds include current detection thresholds and voltage detection thresholds, the analog detection thresholds include analog current detection thresholds converted from current detection thresholds and analog voltage conversion thresholds converted from voltage detection thresholds, the detection circuit compares the real-time current with the analog current detection threshold, and compares the real-time voltage (current) with the analog voltage (current) detection threshold to obtain a fault signal.

[0044] Furthermore, the fault detection submodule also includes a straight-through protection circuit to detect power supply straight-through faults. When no module opening signal is detected and the voltage or current exceeds the set threshold, the circuit outputs a straight-through protection signal to drive the main control module 4 to cut off the power supply.

[0045] In one embodiment, the monitoring and protection system also includes detection threshold recovery and verification functions, and the fault protection module also includes a high-voltage side voltage-frequency conversion box and a low-voltage side frequency-voltage conversion box. The fault detection submodule and the high-voltage side voltage-frequency conversion box are located on the high-voltage side, while the local threshold deployment submodule, the low-voltage side frequency-voltage conversion box, and the host computer are located on the low-voltage side. The high-voltage side frequency-frequency conversion box and the low-voltage side frequency-voltage conversion box are connected via optical fiber.

[0046] The high-voltage side voltage-frequency conversion box is connected to the fault detection submodule, converts the analog detection threshold converted by the fault detection submodule into a frequency signal, and then transmits it to the low-voltage side frequency-voltage conversion box to restore it to a voltage signal. The local threshold deployment submodule collects the signal and compares it with the issued detection threshold to determine whether the issuance is successful.

[0047] The local threshold deployment submodule also includes a testing submodule, and the detection submodule completes the detection threshold retrieval and comparison functions.

[0048] In one embodiment, the fault protection module performs fault detection on both the voltage and current signals and includes an overvoltage detection submodule and an overcurrent detection submodule, which are executed in parallel. The overvoltage detection submodule compares the first processed voltage signal with a voltage detection threshold and outputs an overvoltage signal based on the comparison result. The overcurrent detection submodule compares the first processed current signal with a current detection threshold and outputs an overcurrent signal based on the detection result.

[0049] See also Figure 4The overvoltage detection submodule and the overcurrent detection submodule are located in the voltage protection box and the current protection box, respectively, with the two boxes isolated from each other. The overvoltage detection submodule and the overcurrent detection submodule have similar circuit structures, both including a D / A conversion circuit, a protection action signal generation circuit (comparison circuit, fault signal generation circuit), a pass-through protection circuit, and a threshold voltage-frequency conversion circuit (voltage-frequency conversion box on the high-voltage side). Personnel send voltage and current protection thresholds in the threshold configuration system of the fault protection system's host computer. The local threshold deployment submodule transmits the configured voltage (current) detection threshold to the overvoltage detection submodule and overcurrent detection submodule through synchronous encoding via the transmission data line and clock line. The D / A conversion circuit converts the voltage (current) detection threshold into an analog voltage (current) detection threshold. The comparison circuit compares the real-time voltage (current) signal with the analog voltage (current) detection threshold. The fault signal generation circuit generates an overvoltage or overcurrent signal. The analog voltage (current) detection threshold is converted into a frequency signal through the respective threshold voltage-frequency conversion circuits and sent to the low-voltage side threshold frequency-voltage conversion box. The verification submodule compares the recovery detection threshold with the sent threshold to determine whether the sending is successful, ensuring the high safety and reliability of the system.

[0050] Fault signals such as overvoltage or overcurrent are sent to the main control module 4 for power control. At the same time, overvoltage, overcurrent, and direct protection signals are transmitted to the digital measurement module 6 through optical fiber and sent to the signal acquisition module 5 after photoelectric conversion.

[0051] Furthermore, the overvoltage detection submodule and the overcurrent detection submodule also include a built-in circuit generation module. In the high-voltage side fault detection submodule, the detection threshold is not only sent by the upper computer, but also generated by the built-in circuit itself. The built-in circuit can also send two overvoltage / overcurrent signals, which are respectively sent to the control module and the signal acquisition module.

[0052] Furthermore, both the overvoltage and overcurrent detection submodules include a shoot-through protection module. When no module activation signal is detected but the voltage or current exceeds the detection threshold, indicating a power shoot-through, the protection activation signal generation circuit outputs a shoot-through protection signal. This shoot-through protection signal is transmitted via optical fiber to the digital measurement module, and then, after photoelectric conversion, is sent to the signal acquisition module and the main control module. Upon receiving the overvoltage, overcurrent, or shoot-through signal, the control system disconnects the power module.

[0053] In the application scenario of compatibility between high-power high-voltage power supply and general high-voltage power supply, the personnel perform the following operations during implementation: (1) Connect the output end of the high-frequency voltage divider / current sensor to the input end of the voltage-frequency conversion circuit. After the voltage and current signals of the high-voltage power supply undergo voltage-frequency conversion and frequency-voltage conversion and enter the acquisition system, personnel can read the waveform in real time at one end of the acquisition system.

[0054] (2) For high-voltage power supplies operating with high-frequency modulation, the high-frequency voltage and current signals they output are connected to a high-speed signal conditioning module. After internal A / D and D / A conversion, personnel read the waveforms in real time at one end of the acquisition system.

[0055] (3) Personnel send voltage and current protection thresholds in the upper computer threshold configuration system of the fault protection system. When the power output parameters are higher than the sent thresholds or the thresholds generated by the built-in circuit, the control system cuts off the power module after receiving the overvoltage, overcurrent or direct-through signal to achieve the protection function.

[0056] (4) Fault signals such as overvoltage and overcurrent are transmitted to the digital signal measurement system through optical fiber, and then sent to the signal acquisition system after photoelectric conversion. Personnel can read the power supply fault status in real time.

[0057] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power signal monitoring and protection system, characterized in that: Applied to high voltage power supply, the power signal monitoring and protection system includes: a first conversion module, configured to perform a first processing on a monitoring signal collected from the high-voltage power supply, wherein the first processing includes buffer filtering processing, and the monitoring signal includes a voltage signal and / or a current signal; a high-speed signal conditioning module, configured to perform a second processing on the monitoring signal after the first processing, wherein the second processing includes: first performing analog-to-digital conversion and then performing digital-to-analog conversion; a fault protection module, communicating with a host computer, configured to locally configure a detection threshold according to configuration information received from the host computer, compare the monitoring signal after the first processing with the detection threshold, and output a fault signal according to the comparison result; a control module, configured to output a control signal according to the fault signal to cut off the high voltage power supply; A signal acquisition module is used to acquire the fault detection signal and the monitoring signal after the second processing.

2. The power signal monitoring and protection system according to claim 1, characterized in that: The first conversion module is further configured to perform a third process on the monitoring signal that has undergone the first process, wherein the third process includes a voltage-frequency conversion process; The control module is further configured to receive the monitoring signal that has undergone the third processing, and output a control signal to cut off the high-voltage power supply according to the monitoring signal that has undergone the third processing.

3. The power signal monitoring and protection system according to claim 2, characterized in that: The system further includes a second conversion module, the second conversion module being configured to perform a fourth process on the monitoring signal that has undergone the third process, the fourth process including a frequency-voltage conversion process; The signal acquisition module is further configured to acquire the monitoring signal that has undergone the fourth processing.

4. The power signal monitoring and protection system according to claim 3, characterized in that: The first conversion module includes a buffer circuit, a voltage-frequency conversion circuit, a first input terminal, a first output terminal, a second output terminal, a third output terminal and a fourth output terminal; The first input terminal receives a monitoring signal collected from the high voltage power supply; The buffer circuit is connected to the first input terminal and is configured to perform the first processing on the monitoring signal; The first output end is used to transmit the monitoring signal after the first processing to the high-speed signal conditioning module, and the second output end is used to transmit the monitoring signal after the first processing to the fault protection module; The voltage-frequency conversion circuit is connected in series with the buffer circuit, and is used to perform the third processing on the monitoring signal that has undergone the first processing; The third output terminal is used to transmit the monitoring signal after the third processing to the second conversion circuit, and the fourth output terminal is used to transmit the monitoring signal after the third processing to the control module; The first input end, the first output end, and the second output end use BNC interfaces, and the third output end and the fourth output end use HFBR interfaces.

5. The power signal monitoring and protection system according to claim 3, characterized in that: The first conversion module and the second conversion module are connected via an optical fiber.

6. The power signal monitoring and protection system according to claim 3, characterized in that: The voltage-frequency conversion circuit adopts AD650 isolation chip.

7. The power signal monitoring and protection system according to claim 1, characterized in that: The fault protection module includes a local threshold deployment submodule and a fault detection submodule, and the local threshold deployment submodule and the fault detection submodule are connected via a transmission data line and a clock line; The local threshold deployment submodule communicates with the host computer and is used to locally configure the detection threshold according to the configuration information received from the host computer; and Sending the detection threshold to the fault detection submodule via the transmission data line and the clock line; The fault detection submodule includes a D / A conversion circuit, which is used to convert the sent detection threshold into an analog detection threshold, compare the first processed monitoring signal with the analog detection threshold, and output a fault signal according to the comparison result.

8. The power signal monitoring and protection system according to claim 7, characterized in that: The fault protection module also includes a high-voltage side voltage-frequency conversion box and a low-voltage side frequency-voltage conversion box; the local threshold deployment submodule also includes a check submodule; The fault detection submodule and the high-voltage side voltage-frequency conversion box are located on the high-voltage side, and the local threshold deployment submodule, the low-voltage side frequency-voltage conversion box and the host computer are located on the low-voltage side; The analog detection threshold in the fault detection submodule is converted into a frequency signal by the high-voltage side frequency-voltage conversion box, then restored by the low-voltage side frequency-voltage conversion box, and finally retrieved by the verification submodule. The verification submodule compares the analog detection threshold with the issued detection threshold to determine whether the issuance is successful.

9. The power signal monitoring and protection system according to claim 7 or 8, characterized in that: The fault detection submodule includes an overvoltage detection submodule and an overcurrent detection submodule, and the detection threshold includes a voltage detection threshold and a current detection threshold; The overvoltage detection submodule includes a first comparison circuit, configured to compare the voltage signal after the first processing with the voltage detection threshold, and output an overvoltage signal according to the comparison result; The overcurrent detection submodule includes a second comparison circuit, which is used to compare the current signal after the first processing with the current detection threshold, and output an overcurrent signal according to the detection result.

10. The power signal monitoring and protection system according to claim 1, characterized in that: The high-speed signal conditioning module includes a high-speed A / D conversion circuit and a high-speed D / A conversion circuit; The high-speed A / D conversion circuit is located on the high-voltage side, the high-speed D / A conversion circuit is located on the low-voltage side, and the high-speed A / D conversion circuit and the high-speed D / A conversion circuit are connected via an optical fiber.

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