Current monitoring device and method for turn-off thyristor-like devices based on a roebel coil

Abstract

The application discloses a kind of based on rohac coil turn-off thyristor class device current monitoring device and method, it is related to power electronics field.The device includes: at least one rohac coil, including at least one of first rohac coil, second rohac coil and third rohac coil, first rohac coil is used to obtain the induced signal corresponding to anode current, second rohac coil is used to obtain the induced signal corresponding to gate current, third rohac coil is used to obtain the induced signal corresponding to cathode current, at least one of first rohac coil, second rohac coil and third rohac coil is PCB type rohac coil;At least one signal processing circuit is used to integrate amplification to obtain current measurement signal for the received induced signal, and current measurement signal is processed by analog-digital conversion, and current sampling data is obtained;Main control unit is electrically connected with analog-digital conversion circuit, for outputting current monitoring result based on current sampling data.According to the embodiment of the application, the comprehensiveness and reliability of current monitoring can be improved.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and in particular relates to a current monitoring device and method for turn-off thyristor devices based on Rogowski coils. Background Technology

[0002] Currently, turn-off thyristor devices (such as emitter-turn-off thyristors (ETO), avalanche-controlled thyristors (ACT), and integrated gate-commutated thyristors (IGCT)) are widely used in high-capacity, current-controlled power semiconductor devices in fields such as high-voltage direct current transmission, motor drives, and renewable energy. As key components of power electronic systems, the reliable operation of thyristors is crucial to the stability of the entire power system; therefore, real-time monitoring of their operating status is particularly important. Current monitoring is one of the important parameters for monitoring the status of turn-off thyristors, and its development is of great significance for improving the operational reliability and lifespan of these devices. Fast and high-precision current monitoring can promptly detect abnormal operating states and failure states of the devices (such as overcurrent turn-off and turn-off failure), and provide strong support for fault diagnosis and preventive maintenance, thereby effectively reducing system downtime and maintenance costs.

[0003] Currently, methods for monitoring the current of turn-off thyristors mainly focus on measuring the anode current, lacking monitoring of the cathode and gate currents, thus failing to comprehensively reflect the device's operating status. Therefore, a comprehensive and reliable method for monitoring the current of turn-off thyristors remains lacking. Summary of the Invention

[0004] This application provides a current monitoring device and method for turn-off thyristor devices based on Rogowski coils, which can improve the comprehensiveness and reliability of current monitoring.

[0005] In a first aspect, embodiments of this application provide a current monitoring device for a turn-off thyristor based on a Rogowski coil, the device comprising: At least one Rogowski coil, including at least one of a first Rogowski coil, a second Rogowski coil, and a third Rogowski coil, wherein the first Rogowski coil is used to acquire an induced signal corresponding to the anode current of a turn-off thyristor-like device, the second Rogowski coil is used to acquire an induced signal corresponding to the gate current of a turn-off thyristor-like device, and the third Rogowski coil is used to acquire an induced signal corresponding to the cathode current of a turn-off thyristor-like device, and at least one of the first Rogowski coil, the second Rogowski coil, and the third Rogowski coil is a PCB-type Rogowski coil; At least one signal processing circuit is electrically connected to a corresponding Rogowski coil. The signal processing circuit includes an amplifier circuit, an integrator circuit, and an analog-to-digital converter circuit. The signal processing circuit is used to integrate and amplify the received induced signal to obtain a current measurement signal, and to perform analog-to-digital conversion processing on the current measurement signal to obtain current sampling data. The main control unit is electrically connected to the analog-to-digital conversion circuit. It is used to receive current sampling data and output the current monitoring results of the thyristor-type devices that can be turned off based on the current sampling data.

[0006] In some possible implementations, the integrating circuit is configured as a circuit with a reset function, and the main control unit is also electrically connected to the integrating circuit; The main control unit is also used to receive instruction signals from the drive unit of the turn-off thyristor-type device, and output an integral reset control signal to the integral circuit based on the instruction signal, so as to control the integral circuit to switch between the integral working state and the integral reset state.

[0007] In some possible implementations, the first Rogowski coil is an externally snap-on PCB Rogowski coil; Externally clip-on PCB Rogowski coils include an integrated insulation structure and a closed coil structure. The closed coil structure is arranged on an integrated insulation structure, which is used to fix it above the gate terminal area of ​​a turn-off thyristor device by a snap-fit ​​method.

[0008] In some possible implementations, the integrated insulation structure includes a first hollow ring and a second hollow ring connected vertically, the first hollow ring being used to form a snap-fit ​​structure, and the first hollow ring and / or the second hollow ring being used to carry a closed coil structure. The inner diameter of the first hollow ring is equal to or greater than the diameter of the anode terminal of the turn-off thyristor device, and the height of the first hollow ring is equal to or greater than the height of the gate terminal of the turn-off thyristor device.

[0009] In some possible implementations, the inner diameter of the second hollow ring is smaller than the inner diameter of the first hollow ring.

[0010] In some possible implementations, the integrated insulation structure is a structure made of PCB board or insulating material.

[0011] In some possible implementations, the second Rogowski coil is a planar PCB Rogowski coil; The planar PCB Rogowski coil is set in the blank PCB area between the gate cathode interface and the drive circuit element area on the drive unit PCB of the turn-off thyristor-type device, and the coil structure of the planar PCB Rogowski coil is arranged in the middle layer of the blank PCB area.

[0012] In some possible implementations, the intermediate layer corresponding to the blank PCB board area does not have any potential distribution layer other than the coil structure; Furthermore, the gate potential layer and cathode potential layer of the turn-off thyristor-type device are respectively arranged on the upper and lower sides of the middle layer where the coil structure is located, so that the loop magnetic field of the gate current is coupled to the planar PCB Rogowski coil.

[0013] In some possible implementations, the third Rogowski coil is a toroidal PCB Rogowski coil; A ring-shaped PCB Rogowski coil is arranged around the ring-shaped interface connecting the drive unit of the turn-off thyristor-type device to the device package, and the coil structure of the ring-shaped PCB Rogowski coil is arranged in the middle layer of the PCB board of the drive unit for measuring the cathode current of the turn-off thyristor-type device.

[0014] In some possible implementations, the third Rogowski coil is an embedded Rogowski coil; The embedded Rogowski coil adopts a flexible Rogowski coil structure, which is arranged in the gap inside the cathode terminal of the turn-off thyristor-type device package by embedding wires. The flexible Rogowski coil structure leads out a coil output terminal through the notch connecting the drive unit of the turn-off thyristor-type device and the package. The coil output terminal is used for electrical connection to the signal processing circuit.

[0015] In some possible implementations, at least one of the first Rogowski coil, the second Rogowski coil, and the third Rogowski coil adopts a differential coil structure; The differential coil structure includes a first coil planar structure and a second coil planar structure located in two different intermediate layers. The first coil planar structure and the second coil planar structure are connected by a vertical via to form a closed coil.

[0016] In some possible implementations, the coil output of the differential coil structure is led out using a shielded wire structure and connected to the signal processing circuit.

[0017] In some possible implementations, the integrating circuit includes a passive integrating circuit and / or an active integrating circuit; The passive integrator circuit includes a first resistor and a first capacitor. The first end of the first resistor is electrically connected to the input terminal of the passive integrator circuit, the second end of the first resistor is electrically connected to the first end of the first capacitor and the output terminal of the passive integrator circuit, the second end of the first capacitor is electrically connected to the ground terminal, and a first switch is connected in parallel across the two ends of the first capacitor. The active integrator circuit includes an operational amplifier, a second resistor, and a second capacitor. The non-inverting input of the operational amplifier is electrically connected to the input of the active integrator circuit, and the output of the operational amplifier is electrically connected to the output of the active integrator circuit. The second resistor is placed between the ground terminal and the inverting input of the operational amplifier, and the second capacitor is placed between the inverting input and the output of the operational amplifier. A second switch is connected in parallel across the two ends of the second capacitor.

[0018] In some possible implementations, the signal processing circuit also includes a non-inverting amplifier circuit; The integrating circuit, the amplifying circuit, the non-inverting amplifying circuit, and the analog-to-digital converter circuit are connected in series in sequence, or the amplifying circuit, the integrating circuit, the non-inverting amplifying circuit, and the analog-to-digital converter circuit are connected in series in sequence. The non-inverting amplifier circuit is used to amplify the received signal a second time.

[0019] Based on the same inventive concept, in a second aspect, embodiments of this application provide a method for monitoring the current of a Rogowski coil-based turn-off thyristor device, applied to a Rogowski coil-based turn-off thyristor device current monitoring device as described in any of the embodiments of the first aspect above. This Rogowski coil-based turn-off thyristor device current monitoring method includes: Acquire the current sampling data corresponding to the anode current, gate current and cathode current of the turn-off thyristor-type device; Current calibration is performed on the multi-channel current sampling data corresponding to the anode current, gate current, and cathode current to obtain the current monitoring results of turn-off thyristor devices.

[0020] In some possible implementations, current calibration is performed on the multi-channel current sampling data corresponding to the anode current, gate current, and cathode current, respectively, to obtain the current monitoring results of the turn-off thyristor-type device, including: Multi-channel signal time synchronization and amplitude calibration are performed on the multi-channel current sampling data to obtain the calibrated multi-channel intermediate signal; Based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraints of the anode current, gate current and cathode current, and the multi-channel intermediate signal is biased and corrected based on the residual to obtain the multi-channel corrected signal. By utilizing the dynamic characteristics of anode current, gate current, and cathode current, multi-channel correction signals are fused to obtain preliminary fusion results. The weighted projection algorithm is used to correct the preliminary fusion results, and the current estimation results of anode current, gate current and cathode current are output. Based on the current estimation results, the current monitoring results of turn-off thyristor devices are determined.

[0021] In some possible implementations, based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraints of the anode current, gate current, and cathode current, and the multi-channel intermediate signal is biased and corrected based on the residual to obtain a multi-channel corrected signal, including: Based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraint, and the slowly varying component of the residual is extracted. Based on the slowly varying components of the residuals and the preset weighted allocation principle, the first bias estimate corresponding to the anode current, the second bias estimate corresponding to the gate current, and the third bias estimate corresponding to the cathode current are determined. Based on the first bias estimate, the second bias estimate, and the third bias estimate, the multi-channel intermediate signal is biased and corrected to obtain the multi-channel corrected signal.

[0022] In some possible implementations, the current monitoring results of the turn-off thyristor-type devices are determined based on the current estimation results, including: The measurement residuals corresponding to the anode current, gate current, and cathode current are obtained respectively, and the current estimation results are dynamically weighted based on the measurement residuals to obtain the current monitoring results of turn-off thyristor devices.

[0023] In some possible implementations, current calibration is performed on the multi-channel current sampling data corresponding to the anode current, gate current, and cathode current to obtain the current monitoring results of the turn-off thyristor-type device, including: Upon receiving the activation command, record the multi-channel current values ​​corresponding to the anode current, gate current, and cathode current. During the time period from the turn-on command to the next turn-off command, the multi-channel current sampling data is biased and corrected based on the multi-channel current values ​​to obtain the current monitoring results of the turn-off thyristor-type devices.

[0024] Based on the same inventive concept, in a third aspect, embodiments of this application provide a current monitoring device for turn-off thyristor devices based on a Rogowski coil, the device comprising: Processor and memory storing computer program instructions; When the processor executes the computer program instructions, it implements the current monitoring method for turn-off thyristor devices based on Rogowski coils provided in any of the embodiments of this application above.

[0025] Fourthly, embodiments of this application provide a computer storage medium storing computer program instructions, which, when executed by a processor, implement the current monitoring method for turn-off thyristor-type devices based on Rogowski coils provided in any of the above embodiments of this application.

[0026] Fifthly, embodiments of this application provide a computer program product in which instructions, when executed by a processor of an electronic device, cause the electronic device to perform the current monitoring method for turn-off thyristor devices based on Rogowski coils provided in any of the embodiments of this application described above.

[0027] As described above, the present application provides a Rogowski coil-based current monitoring device and method for turn-off thyristor devices. This Rogowski coil-based current monitoring device includes at least one Rogowski coil, at least one signal processing circuit, and a main control unit. The at least one Rogowski coil includes at least one of a first Rogowski coil, a second Rogowski coil, and a third Rogowski coil. The first Rogowski coil is used to acquire the induced signal corresponding to the anode current of the turn-off thyristor device; the second Rogowski coil is used to acquire the induced signal corresponding to the gate current of the turn-off thyristor device; and the third Rogowski coil is used to acquire the induced signal corresponding to the cathode current of the turn-off thyristor device. At least one of the first, second, and third Rogowski coils is a PCB-type Rogowski coil. The signal processing circuit is electrically connected to the corresponding Rogowski coil and includes an amplifier circuit, an integrator circuit, and an analog-to-digital converter circuit. The signal processing circuit integrates and amplifies the received induced signal to obtain a current measurement signal, and performs analog-to-digital conversion on the current measurement signal to obtain current sampling data. The main control unit is electrically connected to the analog-to-digital conversion circuit to receive current sampling data and output the current monitoring results of the thyristor-type devices that can be turned off based on the current sampling data.

[0028] Compared to traditional Rogowski coils, which are bulky, have low measurement accuracy, are difficult to integrate into compact electronic devices, and only support anode current measurement, this application's embodiment of a Rogowski coil-based current monitoring device and method for turn-off thyristors uses multiple Rogowski coils to monitor the currents at different poles of the anode, cathode, and gate currents. This provides a more comprehensive understanding of the current state of the turn-off thyristor, improving the comprehensiveness and reliability of current monitoring. Furthermore, this embodiment uses at least one of the first, second, and third Rogowski coils as a PCB-type Rogowski coil, enabling high integration and compact arrangement without occupying excessive extra space. This also helps reduce parasitic inductance and capacitance, resulting in faster dynamic response and higher reliability. Simultaneously, a signal processing circuit processes the induced signal, including amplification, integration, and analog-to-digital conversion, converting the analog signal into a digital signal. The main control unit receives the processed current sampling data and outputs the current monitoring results, thereby improving the reliability and accuracy of current monitoring processing and supporting the stable operation of the power system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a typical structure of an IGCT provided in an embodiment of this application; Figure 2 This is a schematic diagram of the IGCT package cross-section and current distribution provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a current monitoring device for turn-off thyristor-type devices based on a Rogowski coil, provided in an embodiment of this application. Figure 4 This is a schematic diagram of the structure of a current monitoring device for a turn-off thyristor-type device based on a Rogowski coil, provided in another embodiment of this application. Figure 5 This is a schematic diagram of the deployment architecture of an externally clipped PCB Rogowski coil provided in one embodiment of this application; Figure 6 This is a cross-sectional structural schematic diagram of an externally clipped PCB Rogowski coil provided in an embodiment of this application; Figure 7 This is a schematic diagram of the coil wiring of an externally clipped PCB Rogowski coil provided in one embodiment of this application; Figure 8 This is a schematic diagram of the deployment architecture of an externally clipped PCB Rogowski coil provided in another embodiment of this application; Figure 9 This is a schematic diagram of the deployment architecture of a planar PCB Rogowski coil and a ring-shaped PCB Rogowski coil provided in an embodiment of this application; Figure 10 This is a schematic diagram of the coil wiring of a planar PCB Rogowski coil and a ring-shaped PCB Rogowski coil provided in an embodiment of this application; Figure 11 This is a schematic diagram of the deployment architecture of an embedded PCB Rogowski coil provided in one embodiment of this application; Figure 12 This is a schematic diagram of the structure of a current monitoring device for a turn-off thyristor-type device based on a Rogowski coil, provided in another embodiment of this application; Figure 13 This is a schematic diagram of the structure of an integrating circuit provided in an embodiment of this application; Figure 14 This is a schematic flowchart of a current monitoring method for turn-off thyristor devices based on Rogowski coils, provided in one embodiment of this application.

[0031] Figure 15 This is a schematic diagram of the structure of a current monitoring device for a turn-off thyristor-type device based on a Rogowski coil, provided in one embodiment of this application. Detailed Implementation

[0032] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0034] As described in the background section, current methods for monitoring the current of turn-off thyristors mainly focus on measuring the anode current, lacking monitoring of the cathode and gate currents, and thus failing to comprehensively reflect the device's operating status. Therefore, a comprehensive and reliable method for monitoring the current of turn-off thyristors is still lacking.

[0035] Specifically, such as Figure 1 As shown, turn-off thyristor devices mainly consist of three parts: the chip, the package, and the driver. The chip is primarily responsible for the power conversion function, the package provides mechanical support and electrical connections, and the driver controls the device. A typical example of a turn-off thyristor device is the IGCT device, as shown in the diagram. Figure 1 As shown, the turn-off thyristor chip is packaged with a pressure-fit package to expose the anode terminal, cathode terminal, and gate terminal. The gate cathode terminal is connected to the turn-off thyristor drive unit via a drive ring interface. Both the package and the drive gate cathode ring have a notch to facilitate screwing the package into the drive ring interface. Multiple sets of circular holes are distributed on both the package's gate cathode terminal and the corresponding drive gate cathode ring interface. After connection, a stable mechanical fixation and electrical connection are achieved by inserting bolts into the circular holes. The drive's PCB (Printed Circuit Board) has a structure including a top layer, at least two intermediate layers, and a bottom layer.

[0036] As a current-controlled device, such as Figure 2 As shown, the current in a turn-off thyristor device mainly includes the anode current. Cathode current and gate current ,in Under normal conduction conditions, it can turn off the anode current of thyristor-type devices. and cathode current Essentially equal, gate current The leakage current is relatively small. Under normal blocking conditions, the anode current, cathode current, and gate current of a turn-off thyristor device are all close to zero. During turn-off, the turn-off thyristor device reduces the cathode current by applying a reverse voltage to the gate cathode. Commutation to gate current This achieves turn-off. During turn-on, a strong trigger pulse is injected into the gate of a thyristor-type device via a drive. This allows turn-off thyristor devices to quickly enter the conduction state. Therefore, the operating state of turn-off thyristor devices is closely related to the three major currents, especially the dynamic characteristics of turn-on and turn-off and the cathode current. and gate current There is a direct connection. To achieve accurate monitoring, analysis, and diagnosis of the entire operating state of turn-off thyristor devices, it is necessary to... , and Real-time monitoring is conducted.

[0037] Currently, the primary method for measuring the current in turn-off thyristor devices is the Rogowski coil method. A Rogowski coil is a current measuring device based on the principle of electromagnetic induction; it measures the current flowing through a conductor by using a closed loop coil wound around the conductor. The alternating current flowing through the Rogowski coil... A voltage signal proportional to the current will be induced in the Rogowski coil. Its expression is: ,in This represents the sensitivity coefficient of the Rogowski coil. The waveform of the measured current can be obtained by integrating the induced voltage signal. However, current methods for monitoring the current of turn-off thyristor devices all focus on the anode current. In terms of measurement, there is a lack of measurement of cathode current. and gate current The measurement method. The current path of a thyristor-type device that can be turned off is as follows: Figure 2 As shown, due to the press-fit closed package design of turn-off thyristor-type devices, they can achieve cathode current... Gate current The independent measurement portion is extremely limited and is concentrated within the enclosed package of turn-off thyristor-type devices, making it difficult to achieve cathode current measurement using traditional Rogowski coil solutions. Gate current Direct measurement. In addition, existing closed-loop Rogowski coils of this type also have disadvantages such as weak anti-interference ability, poor transient response characteristics, and DC zero drift.

[0038] In summary, there is currently no method that can simultaneously control the anode current of turn-off thyristor-type devices. Cathode current and gate current The measurement methods are inadequate. Furthermore, existing current measurement methods suffer from susceptibility to interference, low accuracy, and DC zero drift, which prevents accurate monitoring and diagnosis of the full operating state of turn-off thyristors, posing a threat to their safe operation.

[0039] In view of the above, in order to solve or improve the problems of the prior art one by one, the embodiments of this application provide a current monitoring device and method for turn-off thyristor-type devices based on Rogowski coils. It should be noted that the embodiments provided in this application are not intended to limit the scope of this application.

[0040] The following section first introduces the current monitoring method for turn-off thyristor devices based on Rogowski coils, as described in the embodiments of this application. This application proposes a high-precision current monitoring device and method for turn-off thyristor devices based on Rogowski coils. The overall technical concept is to achieve the monitoring of the anode current of turn-off thyristor devices through an "external PCB Rogowski coil design". High-precision acquisition is achieved through a "planar PCB Rogowski coil design" to obtain the gate current of turn-off thyristor devices. High-precision acquisition of cathode current using "ring-shaped PCB Rogowski coil design" and "embedded Rogowski coil design". High-precision acquisition. Meanwhile, addressing the shortcomings of Rogowski coils, such as susceptibility to interference and DC drift bias, a resettable integrating circuit is proposed in hardware, and a software-based... , and A multi-parameter joint calibration method for the three major current characteristics, along with a bias reset method, improves the accuracy and reliability of Rogowski coil measurements.

[0041] It should be noted that the schematic diagrams in the embodiments of this application are all based on IGCT devices as examples. The installation position and structural design of the coil design are based on the typical packaging structure of IGCT devices, but do not involve design requirements that are only applicable to special structures on IGCT. Any design scheme applicable to other types of turn-off thyristor devices is included within the protection scope of the embodiments of this application.

[0042] Please see below first. Figure 3 This application provides a current monitoring device for a turn-off thyristor based on a Rogowski coil 100. The turn-off thyristor based on a Rogowski coil 100 includes: At least one Rogowski coil 100 includes at least one of a first Rogowski coil 110, a second Rogowski coil 120, and a third Rogowski coil 130. The first Rogowski coil 110 is used to acquire an induced signal corresponding to the anode current of a thyristor-like device, the second Rogowski coil 120 is used to acquire an induced signal corresponding to the gate current of a thyristor-like device, and the third Rogowski coil 130 is used to acquire an induced signal corresponding to the cathode current of a thyristor-like device. At least one of the first Rogowski coil 110, the second Rogowski coil 120, and the third Rogowski coil 130 is a PCB-type Rogowski coil. At least one signal processing circuit 200 is electrically connected to a corresponding Rogowski coil 100. The signal processing circuit 200 includes an amplifier circuit 10, an integrator circuit 20, and an analog-to-digital converter circuit 30. The signal processing circuit 200 is used to integrate and amplify the received induced signal to obtain a current measurement signal, and to perform analog-to-digital conversion processing on the current measurement signal to obtain current sampling data. The main control unit 300 is electrically connected to the analog-to-digital conversion circuit 30. It is used to receive current sampling data and output the current monitoring results of the thyristor-type devices that can be turned off based on the current sampling data.

[0043] Specifically, the first Rogowski coil 110, the second Rogowski coil 120, and the third Rogowski coil 130 are respectively arranged at different positions in the thyristor-like device to induce corresponding current signals. For example, the first Rogowski coil 110 is arranged near the anode of the thyristor-like device to acquire the induced signal corresponding to the anode current of the turn-off thyristor-like device. The second Rogowski coil 120 is arranged near the gate to acquire the induced signal corresponding to the gate current of the turn-off thyristor-like device. The third Rogowski coil 130 is arranged near the cathode to acquire the induced signal corresponding to the cathode current of the turn-off thyristor-like device.

[0044] In this application, at least one of the first Rogowski coil 110, the second Rogowski coil 120, and the third Rogowski coil 130 can be a PCB-type Rogowski coil. Compared to the traditional toroidal Rogowski coil 100, which has drawbacks such as large size, low measurement accuracy, and difficulty in integration into compact electronic devices, this embodiment achieves high integration by designing the coil on a multi-layer PCB board. For example, within the package of devices such as IGCTs or in the drive unit, the PCB-type Rogowski coil can be densely arranged without occupying excessive additional space. Furthermore, this embodiment optimizes the coil geometry and wiring method through PCB-type coil design, reducing parasitic inductance and capacitance, thereby achieving faster dynamic response and higher reliability.

[0045] The aforementioned signal processing circuit 200 is electrically connected to the corresponding Rogowski coil 100. It uses amplifier circuit 10 and integrator circuit 20 to integrate and amplify the weak induced signal output from the Rogowski coil 100 to obtain a current measurement signal, bringing it to a level suitable for subsequent processing. Then, analog-to-digital converter circuit 30 converts the integrated and amplified analog signal into a digital signal to obtain current sampling data for processing by the main control unit 300.

[0046] In practical applications, the aforementioned amplifier circuit 10 can use an operational amplifier or a differential amplifier circuit to amplify the induced signal output by the Rogowski coil 100. The aforementioned integrator circuit 20 can be implemented using an active integrator circuit and / or a passive integrator circuit to recover a signal proportional to the current by integrating the signal. The aforementioned analog-to-digital converter circuit 30 can use a high-speed ADC (such as a 16-bit or higher precision ADC) to convert the integrated analog signal into a digital signal.

[0047] It should be noted that in the actual signal processing, the induced signal output by the Rogowski coil 100 can be amplified by the amplifier circuit 10 first, and then the amplified signal can be integrated by the integrator circuit 20 to obtain the current measurement signal. Alternatively, the induced signal output by the Rogowski coil 100 can be integrated by the integrator circuit 20 first, and then the integrated signal can be amplified by the amplifier circuit 10. The order of the integrator circuit 20 and the amplifier circuit 10 is not restricted here.

[0048] The aforementioned main control unit 300 is electrically connected to the analog-to-digital conversion circuit 30. It can process the current sampling data after analog-to-digital conversion, calculate the actual current value, and output the actual current value as the current monitoring result of the turn-off thyristor-type device. Furthermore, the main control unit 300 can also determine the operating status of the thyristor-type device based on the current data and detect abnormal conditions (such as overcurrent, turn-off failure, etc.).

[0049] The aforementioned main control unit 300 can be implemented using programmable controllers such as microcontroller units (MCUs), digital signal processors (DSPs), and field-programmable gate arrays (FPGAs), and no strict limitation is made here.

[0050] Combination Figure 3 As shown, in one example, taking the differential amplifier circuit 10 as an example, the Coil+ terminal (Vcoil+) and Coil- terminal (Vcoil-) of the Rogowski coil 100 are connected to the positive and negative input terminals of the differential amplifier circuit, respectively. The signal amplified by the differential amplifier circuit is connected to the integrator circuit 20 for integration processing, output to the analog-to-digital converter circuit 30 for sampling, and finally output to the main control unit 300 for processing, or directly led out. It should be noted that the order of the amplifier circuit 10 and the integrator circuit 20 is not limited to the above description. The integrator circuit 20, in whole or in part, can be placed before the differential amplifier circuit. After the signals received by the Coil+ and Coil- terminals have undergone complete / partial integration processing, differential amplification processing is then performed.

[0051] It should be noted that the differential amplifier circuit is mainly used in scenarios where the Rogowski coil 100 is arranged in a differential structure. If the Rogowski coil 100 is arranged in a single-ended structure, a conventional amplifier circuit 10 can be used instead. The differential amplifier circuit can be implemented using a differential amplifier or a typical differential amplifier circuit based on an operational amplifier, and no limitation is made here.

[0052] As described above, the present application provides a current monitoring device for a turn-off thyristor based on a Rogowski coil 100. This device includes at least one Rogowski coil 100, at least one signal processing circuit 200, and a main control unit 300. The at least one Rogowski coil 100 includes at least one of a first Rogowski coil 110, a second Rogowski coil 120, and a third Rogowski coil 130. The first Rogowski coil 110 is used to acquire the induced signal corresponding to the anode current of the turn-off thyristor; the second Rogowski coil 120 is used to acquire the induced signal corresponding to the gate current of the turn-off thyristor; and the third Rogowski coil 130 is used to acquire the induced signal corresponding to the cathode current of the turn-off thyristor. At least one of the first Rogowski coil 110, the second Rogowski coil 120, and the third Rogowski coil 130 is a PCB-type Rogowski coil. The signal processing circuit 200 is electrically connected to the corresponding Rogowski coil 100. The signal processing circuit 200 includes an amplifier circuit 10, an integrator circuit 20, and an analog-to-digital converter circuit 30. The signal processing circuit 200 integrates and amplifies the received induced signal to obtain a current measurement signal, and performs analog-to-digital conversion on the current measurement signal to obtain current sampling data. The main control unit 300 is electrically connected to the analog-to-digital converter circuit 30 and is used to receive the current sampling data and output the current monitoring results of the turn-off thyristor-type devices based on the current sampling data.

[0053] Compared to traditional toroidal Rogowski coils 100, which are bulky, have low measurement accuracy, are difficult to integrate into compact electronic devices, and only support anode current measurement, this application's embodiment of a current monitoring device for turn-off thyristor devices based on Rogowski coils 100 monitors the currents at different poles of the anode, cathode, and gate currents using multiple Rogowski coils 100. This provides a more comprehensive understanding of the current state of the turn-off thyristor device, improving the comprehensiveness and reliability of current monitoring. Furthermore, in this embodiment, at least one of the first Rogowski coil 110, the second Rogowski coil 120, and the third Rogowski coil 130 is a PCB-type Rogowski coil, enabling high integration and compact arrangement without occupying excessive additional space. This also helps reduce parasitic inductance and capacitance, resulting in faster dynamic response and higher reliability. Meanwhile, a signal processing circuit 200 is set up to process the induced signal, including amplification, integration and analog-to-digital conversion, converting the analog signal into a digital signal. The main control unit 300 receives the processed current sampling data and outputs the current monitoring results, thereby improving the reliability and accuracy of current monitoring and processing, and providing support for the stable operation of the power system.

[0054] Please see below. Figure 4 Optionally, according to some embodiments of this application, the integrating circuit 20 is configured as a circuit with a reset function, and the main control unit 300 is also electrically connected to the integrating circuit 20. The main control unit 300 is also used to receive the instruction signal of the drive unit of the turn-off thyristor-type device, and output the integral reset control signal to the integral circuit 20 based on the instruction signal, so as to control the integral circuit 20 to switch between the integral working state and the integral reset state.

[0055] In this embodiment, the integrating amplifier circuit adopts a resettable integrating amplifier circuit design, which can effectively solve the DC drift bias problem that easily occurs in the Rogowski coil 100 under multiple repetitive pulse conditions (corresponding to the continuous turn-on and turn-off conditions of turn-off thyristor devices). Specifically, the integrating circuit 20 accumulates charge during integration. If it is not reset, it may lead to the accumulation of integration error, affecting the measurement accuracy. The reset function allows the integrating circuit 20 to be cleared to zero before the start of each measurement cycle, thereby ensuring that each integration starts from zero, improving the accuracy and reliability of the measurement.

[0056] The main control unit 300 not only receives current sampling data but is also electrically connected to the integrator circuit 20, enabling it to receive command signals from the drive unit of the turn-off thyristor-type device. Based on these command signals, the main control unit 300 outputs corresponding integrator reset control signals to the integrator circuit 20, controlling the integrator circuit 20 to switch between integrator operating state and integrator reset state.

[0057] In this way, when the main control unit 300 receives a command signal from the drive unit indicating that a reset operation is required, the main control unit 300 sends an integral reset control signal to the integrator circuit 20. The integrator circuit 20 enters the reset state, releases the accumulated charge, clears the output of the integrator to zero, and prepares to start a new integration cycle. After the reset is completed, the integrator circuit 20 switches to the integration working state and begins to integrate the induced signal from the Rogowski coil 100. This significantly improves the accuracy of the signal integration stage in current monitoring.

[0058] The coil's Coil+ and Coil- terminals are connected to the positive and negative input terminals of the differential amplifier circuit, respectively. The signal amplified by the differential amplifier circuit is connected to the integrator circuit 20 for integration. The output of the integrator circuit 20 is connected to the non-inverting amplifier circuit 40 for secondary amplification, and finally output to the high-speed ADC for sampling, and finally output to the main control unit 300 for processing, or directly led out. The fiber optic communication module 400 is used to receive the turn-on / turn-off command signal driven by the turn-off thyristor-like device, and transmit the command signal to the main control unit 300. The main control unit 300 generates an integration reset command, and resets the integrator circuit 20 through the analog switch of the resettable integrator circuit 20. The power supply section provides a stable operating power for the entire circuit.

[0059] It should be added that, in order to achieve efficient and accurate transmission of command signals, an optical fiber communication module 400 can also be provided in the aforementioned signal processing circuit 200. The optical fiber communication module 400 is used to receive turn-on / turn-off command signals driven by turn-off thyristor-type devices and transmit the command signals to the main control unit 300. The main control unit 300 generates an integral reset control command, which is then used by the integral circuit 20 for reset control. Furthermore, the turn-off thyristor-type device current monitoring device based on the Rogowski coil 100 can also include a power supply section. This power supply section can provide a stable operating power supply for the overall circuit to ensure the long-term reliable operation of the device.

[0060] It should be added that the fiber optic communication module 400 and the main control unit 300 here can be directly driven by turn-off thyristor devices, thereby simplifying the overall circuit design.

[0061] Please see below. Figure 5 Optionally, according to some embodiments of this application, the first Rogowski coil 110 is an externally snap-on PCB Rogowski coil; the externally snap-on PCB Rogowski coil includes an integrated insulation structure 101 and a closed coil structure 102, the closed coil structure 102 being arranged on the integrated insulation structure 101, and the integrated insulation structure 101 being used to be fixed above the gate terminal region of a turn-off thyristor-type device in a snap-on manner.

[0062] Optionally, according to some embodiments of this application, the integrated insulation structure 101 includes a first hollow ring 1011 and a second hollow ring 1012 connected vertically. The first hollow ring 1011 is used to form a snap-fit ​​structure, and the first hollow ring 1011 and / or the second hollow ring 1012 are used to carry the closed coil structure 102. The inner diameter of the first hollow ring 1011 is equal to or greater than the diameter of the anode terminal of the turn-off thyristor-like device, and the height of the first hollow ring 1011 is equal to or greater than the height of the gate terminal of the turn-off thyristor-like device. Optionally, according to some embodiments of this application, the inner diameter of the second hollow ring 1012 is smaller than the inner diameter of the first hollow ring 1011.

[0063] Specifically, in one particular example provided in this application, combined with Figure 5 as well as Figure 6 As shown, the integrated insulation structure 101 can be constructed by connecting two hollow rings of the same thickness but different inner diameters. The first hollow ring 1011 forms a snap-fit ​​structure to fix the Rogowski coil 100 above the gate terminal of the turn-off thyristor-like device. The second hollow ring 1012 can form the main part of the Rogowski coil 100, thereby controlling the anode current of the turn-off thyristor-like device. Measurement.

[0064] The inner diameter of the first hollow ring 1011 is equal to or slightly larger than the diameter of the anode terminal of the turn-off thyristor-like device, and its height is equal to or larger than the height of the gate terminal of the turn-off thyristor-like device, to ensure that the Rogowski coil 100 can be securely snapped onto the gate terminal of the turn-off thyristor-like device. The inner diameter of the second hollow ring 1012 can be smaller than the inner diameter of the first hollow ring 1011, and its distance from the IGCT (or other turn-off thyristor-like device) must meet electrical insulation requirements. The height of the second hollow ring 1012 and the outer diameter of the overall ring (the first hollow ring 1011 and the second hollow ring 1012) are designed according to actual needs. Furthermore, the height of the second hollow ring 1012 and the outer diameter of the overall ring can be set larger to provide a larger coil area for the Rogowski coil 100, thereby helping to improve the sensitivity of the Rogowski coil 100.

[0065] There are three main ways to arrange the closed coil structure 102 on the integrated insulation structure 101: the coil can be arranged only in the first hollow ring 1011, only in the second hollow ring 1012, or in both the first hollow ring 1011 and the second hollow ring 1012. The output voltage terminal of the closed coil structure 102 can be led out via leads and connected to the subsequent signal processing circuit 200 for processing.

[0066] Optionally, such as Figure 7 As shown, the first Rogowski coil 110 can adopt a differential coil structure. The differential coil structure includes a first turn planar structure and a second turn planar structure located in two different intermediate layers. The first turn planar structure and the second turn planar structure are connected by a vertical via to form a closed coil. Figure 7 The routing method of the differential Rogowski coil shown has strong anti-interference capability.

[0067] Combination Figure 7 As shown, several parallel and uniformly distributed coil structures, called Coil+ and Coil- (the first and second planar coil structures), are simultaneously arranged on two intermediate layers of different thicknesses of the circular ring, with the center of the integrated structure as the base point and a certain value between the inner and outer diameters of the hollow circular ring. The two planar coil structures are connected through vertical vias to form a closed coil structure. The final end of Coil+ is connected to the initial end of Coil- as the GND potential output terminal; the final end of Coil+ serves as the Vcoil+ potential output terminal, and the return line of the final end of Coil- serves as the Vcoil- potential output terminal, which is led out to the subsequent signal processing circuit 200 for processing. More specifically, the output voltage terminal of the closed coil structure 102 can be led out through a lead, which can be a shielded wire structure to improve anti-interference capability, such as twisted pair or coaxial cable.

[0068] It should be noted that, apart from the aforementioned differential Rogowski coil design, other designs that utilize a closed coil structure 102 arranged on the aforementioned integrated structure to monitor the anode current of turn-off thyristor devices are all included within the scope of protection of this application. Furthermore, the aforementioned wiring method is also applicable to subsequent gate current monitoring and cathode current monitoring schemes.

[0069] Optionally, according to some embodiments of this application, the integrated insulation structure 101 is a structure made of PCB board or insulating material. In this embodiment, the material selected for the integrated insulation structure 101 is insulating material. Furthermore, it can be manufactured using PCB board, which facilitates the coil wiring of the Rogowski coil 100.

[0070] It should be noted that the use of a hollow ring design is not a necessary condition for this embodiment. Other designs that use a snap-fit ​​integrated structure to fix and arrange a closed coil structure 102 above the device gate terminal to achieve monitoring of the anode current of a turn-off thyristor-like device are all included within the scope of protection of this application. For example Figure 8 The preferred design shown, in which a cuboid lead-out structure is additionally connected to the ring, also falls within the scope of protection of this application.

[0071] Please see below. Figure 9 Optionally, according to some embodiments of this application, the second Rogowski coil 120 is a planar PCB Rogowski coil; the planar PCB Rogowski coil is disposed in the blank PCB area between the gate cathode interface and the drive circuit element area on the drive unit PCB of the turn-off thyristor-type device, and the coil structure of the planar PCB Rogowski coil is arranged in the middle layer of the blank PCB area.

[0072] In this embodiment, within the blank PCB board plane located between the cathode interface of the turn-off thyristor device driver gate and the area of ​​the main circuit elements driving the turn-off thyristor device, combined with Figure 9 As shown, a Rogowski coil structure is arranged in region A1 of the PCB. The coil is deployed on the middle layer of the PCB and is used to control the gate current of turn-off thyristor-type devices. Measurement.

[0073] Optionally, according to some embodiments of this application, the intermediate layer corresponding to the blank PCB board area is not provided with any potential distribution layer other than the coil structure; and the gate potential layer and cathode potential layer of the turn-off thyristor-type device are respectively arranged on the upper and lower sides of the intermediate layer where the coil structure is located, so that the loop magnetic field of the gate current is coupled to the planar PCB Rogowski coil.

[0074] Specifically, in the PCB routing area, no other potential distribution should be set in the middle layer, and the gate potential (and the potential layer on which all gate currents flow from the gate cathode interface to the drive circuit) and the cathode potential (and the potential layer on which all gate currents flow from the drive circuit to the gate cathode interface) are respectively distributed on the upper and lower sides of the coil middle layer, so as to realize the measurement of the gate current.

[0075] Optionally, such as Figure 10 As shown, the second Rogowski coil 120 can also adopt a differential coil structure. The differential coil structure includes a first turn planar structure and a second turn planar structure located in two different intermediate layers. The first turn planar structure and the second turn planar structure are connected by a vertical via to form a closed coil. Figure 10 The routing method of the differential Rogowski coil shown has strong anti-interference capability.

[0076] Combination Figure 10As shown, in a specific implementation, several parallel and uniformly distributed coil structures, referred to as Coil+ and Coil- (the first and second planar coil structures), can be simultaneously arranged on two intermediate layers of different thicknesses on a blank PCB board. The two planar coil structures are connected via vertical vias to form a closed coil structure. The final ends of each coil are connected by a return line located on the other intermediate layer. The final return line of Coil+ is connected to the initial end of Coil-, serving as the GND potential output terminal; the final return line of Coil+ serves as the Vcoil+ potential output terminal, and the final return line of Coil- serves as the Vcoil- potential output terminal, both led out to an integrating amplifier circuit for processing. More specifically, the output voltage terminal of the aforementioned closed coil structure can be led out via a shielded wire structure to improve anti-interference capability; for example, twisted-pair cables or coaxial cables can be used.

[0077] It should be noted that, apart from the differential Rogowski coil design described above, other designs that monitor the gate current of turn-off thyristor devices by arranging closed coil structures on the aforementioned integrated structure are also included within the scope of protection of this application. Furthermore, the wiring method described above is also applicable to other current monitoring schemes.

[0078] Alternatively, according to some embodiments of this application, please continue to refer to... Figure 9 The third Rogowski coil 130 is a ring-shaped PCB Rogowski coil. The ring-shaped PCB Rogowski coil is arranged around the ring-shaped interface connecting the drive unit of the turn-off thyristor device to the device package, and the coil structure of the ring-shaped PCB Rogowski coil is arranged in the middle layer of the PCB board of the drive unit for measuring the cathode current of the turn-off thyristor device.

[0079] Combination Figure 9 The layout of the ring-shaped PCB Rogowski coil shown involves arranging a ring-shaped PCB Rogowski coil structure around the ring-shaped interface connecting the thyristor-type device driver and package. The coil is positioned on the middle layer of the driver unit PCB board. Figure 9 The A2 region shown is used to control the cathode current of turn-off thyristor-type devices. Measurement.

[0080] Optionally, such as Figure 10 As shown, the aforementioned annular PCB Rogowski coil can also employ a differential coil structure. The differential coil structure includes a first turn planar structure and a second turn planar structure located on two different intermediate layers. The first turn planar structure and the second turn planar structure are connected by vertical vias to form a closed coil. Figure 10 The routing method of the differential Rogowski coil shown has strong anti-interference capability.

[0081] In a ring-shaped Rogowski coil on a PCB, several parallel and uniformly distributed coil structures, called Coil+ and Coil- (the first and second planar coil structures), can be simultaneously arranged on two intermediate layers of different thicknesses of the ring, with the center of the integrated structure as the base point and a diameter greater than the outer diameter of the gate cathode interface. These two planar coil structures are connected by vertical vias to form a closed coil structure. The final ends of the two coils are located on one side of the gate cathode interface notch and are connected by a return line on the other intermediate layer. The return line then returns to the initial end (on the other side of the gate cathode interface) via a circular wiring with a diameter greater than the outer diameter of the gate cathode interface. The final return line of Coil+ is connected to the initial end of Coil-, serving as the GND potential output terminal; the final return line of Coil+ serves as the Vcoil+ potential output terminal, and the final return line of Coil- serves as the Vcoil- potential output terminal, both leading to the integrating amplifier circuit for processing. This lead can use a shielded wire structure to improve anti-interference capability, such as twisted pair or coaxial cable.

[0082] It should be noted that, apart from the differential Rogowski coil design described above, other designs that monitor the gate current of turn-off thyristor devices by arranging closed coil structures on the aforementioned integrated structure are also included within the scope of protection of this application. Furthermore, the wiring method described above is also applicable to other current monitoring schemes.

[0083] Optionally, according to some embodiments of this application, such as Figure 11 As shown, the third Rogowski coil 130 is an embedded Rogowski coil; the embedded Rogowski coil adopts a flexible Rogowski coil structure, which is arranged in the gap inside the cathode terminal of the turn-off thyristor-type device package by embedding wires. The flexible Rogowski coil structure leads out a coil output terminal through the notch connecting the drive unit of the turn-off thyristor-type device and the package. The coil output terminal is used to electrically connect to the signal processing circuit 200.

[0084] In this embodiment, combined with Figure 11 As shown, a thin, flexible Rogowski coil structure is used, and it is embedded in the gap inside the cathode terminal of the turn-off thyristor-like device package. The output voltage terminal is led out from the connection notch between the drive and the turn-off thyristor-like device package, thereby controlling the cathode current of the turn-off thyristor-like device. Measurement.

[0085] Optionally, according to some embodiments of this application, at least one of the first Rogowski coil 110, the second Rogowski coil 120, and the third Rogowski coil 130 adopts a differential coil structure; the differential coil structure includes a first turn-plane structure and a second turn-plane structure located in two different intermediate layers, and the first turn-plane structure and the second turn-plane structure are connected by a vertical via to form a closed coil. Optionally, according to some embodiments of this application, the coil output terminal of the differential coil structure is led out using a shielded wire structure and connected to the signal processing circuit 200. It should be understood that a detailed description of this embodiment can be found in the relevant sections above, and will not be repeated here.

[0086] Please see below. Figure 12 Optionally, according to some embodiments of this application, the signal processing circuit 200 further includes a non-inverting amplifier circuit 40; The integrating circuit 20, the amplifying circuit 10, the non-inverting amplifying circuit 40, and the analog-to-digital converter circuit 30 are connected in series in sequence, or the amplifying circuit 10, the integrating circuit 20, the non-inverting amplifying circuit 40, and the analog-to-digital converter circuit 30 are connected in series in sequence; the non-inverting amplifying circuit 40 is used to amplify the received signal a second time.

[0087] In this embodiment, the non-inverting amplifier circuit 40 is used to amplify the received signal a second time. The non-inverting amplifier circuit 40 can amplify these signals from the previous stage to a level suitable for analog-to-digital conversion, thereby improving the signal-to-noise ratio of the signal and ensuring the accuracy of subsequent processing.

[0088] It should be noted that the non-inverting amplifier circuit 40 is not strictly necessary. If the output signal amplitude of the integrating circuit 20 already meets the input requirements of the subsequent ADC, this part can be omitted. The non-inverting amplifier circuit 40 can be implemented using a non-inverting amplifier or a typical non-inverting amplifier circuit 40 based on an operational amplifier.

[0089] like Figure 13 As shown, optionally, according to some embodiments of this application, the above-described integrator circuit 20 includes a passive integrator circuit 22 and / or an active integrator circuit 21; The passive integrator circuit 22 includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is electrically connected to the input terminal of the passive integrator circuit 22, the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1 at the output terminal of the passive integrator circuit 22, the second end of the first capacitor C1 is electrically connected to the ground terminal GND, and the two ends of the first capacitor C1 are connected in parallel to the first switch S1. The active integrator circuit 21 includes an operational amplifier OP, a second resistor R2, and a second capacitor C2. The non-inverting input terminal of the operational amplifier OP is electrically connected to the input terminal of the active integrator circuit 21, and the output terminal of the operational amplifier OP is electrically connected to the output terminal of the active integrator circuit 21. The second resistor R2 is located between the ground terminal and the inverting input terminal of the operational amplifier OP, and the second capacitor C2 is located between the inverting input terminal and the output terminal of the operational amplifier OP. The two ends of the second capacitor C2 are connected in parallel with the second switch S2.

[0090] In this embodiment, the resettable integrating circuit 20 is divided into two schemes: passive integrating and active integrating. The integrating function can be implemented using any one or a combination of both. Specifically, the passive integrating circuit 22 mainly includes an RC integrating circuit composed of a first resistor R1 and a first capacitor C1 connected in series, with a first switch S1 connected in parallel across the first capacitor C1. Furthermore, an analog switch T1 (not shown in the figure) can be connected in series across the second terminal of the first resistor R1. When S1 is closed and T1 is open, the RC integrating circuit is reset, eliminating residual charge in the capacitor and realizing the integrating reset function; when S1 is open and T1 is closed, the RC integrating circuit performs normal integrating operations.

[0091] The active integrator circuit 21 mainly includes an operational amplifier OP, a second capacitor C2, and a second resistor R2. A second switch S2 is connected in parallel across the second capacitor C2. Furthermore, an analog switch T2 (not shown in the figure) can be connected in series at the non-inverting input of the operational amplifier OP. When S2 is closed and T2 is open, the active integrator circuit 21 is reset, eliminating the residual charge in the second capacitor C2 and realizing the integration reset function. When S2 is open and T2 is closed, the active integrator circuit 21 performs normal integration. All of the above switches can be controlled by the main control unit 300 based on the integration reset control command generated by the turn-on / turn-off command driven by a turn-off thyristor-type device. These switches can be implemented using electronic switching devices capable of analog switching functions, such as analog switch chips, field-effect transistors, etc., without strict limitations.

[0092] like Figure 13 As shown, in the case where the active integrator circuit 21 and the passive integrator circuit 22 are combined to implement the integrator circuit 20, the passive integrator circuit 22 is placed first, followed by the active integrator circuit 21. The second terminal of the first resistor R1 in the passive integrator circuit 22 is electrically connected to the non-inverting input terminal of the operational amplifier OP in the active integrator circuit 21. The analog switch T2, which was originally set in series with the non-inverting input terminal of the operational amplifier OP in the separate active integrator circuit 21, and the analog switch T1 connected in series with the second terminal of the first resistor R1, can be eliminated to reduce component consumption.

[0093] Based on the Rogowski coil-based current monitoring device for turn-off thyristors provided in the above embodiments, and for the same inventive concept, this application also provides a Rogowski coil-based current monitoring method for turn-off thyristors, corresponding to the above-mentioned Rogowski coil-based current monitoring device. The following describes... Figure 14 This paper provides a detailed introduction to the current monitoring method for turn-off thyristor devices based on Rogowski coils.

[0094] Figure 14 This illustration shows a flowchart of a Rogowski coil-based current monitoring method for turn-off thyristor devices according to an embodiment of this application. This Rogowski coil-based current monitoring method is applied to a Rogowski coil-based current monitoring device. The method can be directly executed by the main control unit in the Rogowski coil-based current monitoring device, or it can be executed by other external host computers or other devices; no limitation is made herein. Figure 14 As shown, the current monitoring method for turn-off thyristor-type devices based on Rogowski coils includes the following steps: S1410: Acquire the current sampling data corresponding to the anode current, gate current and cathode current of the turn-off thyristor-type device, respectively. S1420 performs current calibration on the multi-channel current sampling data corresponding to the anode current, gate current, and cathode current to obtain the current monitoring results of turn-off thyristor devices.

[0095] The specific implementation methods of steps 1410 to 1420 above will be described in detail below. It is understood that the current monitoring method for turn-off thyristor devices based on Rogowski coils has the same or similar technical effects as the aforementioned current monitoring device for turn-off thyristor devices based on Rogowski coils, and will not be repeated here.

[0096] In S1410, specifically, current sampling data corresponding to the anode current, gate current, and cathode current of the turn-off thyristor-like device are acquired. The method for acquiring these current sampling data can be found in the aforementioned description of the current monitoring device for turn-off thyristor-like devices based on Rogowski coils, and will not be elaborated upon here.

[0097] In S1420, for current calibration of multi-channel current sampling data corresponding to anode current, gate current, and cathode current, this application embodiment specifically proposes a method based on... , and A multi-parameter joint calibration method for three major current characteristics and a DC bias elimination method are proposed to achieve high-precision, fast-response, and robust current estimation.

[0098] Among them, multi-parameter joint calibration is mainly achieved by integrating anode current. Cathode current and gate current The measurement information of the three major currents, combined with the current conservation constraint, enables high-precision estimation of the three major currents of turn-off thyristor devices; the DC bias elimination method mainly achieves real-time evaluation and elimination of the DC bias of the Rogowski coil output by utilizing the operating characteristics of turn-off thyristor devices.

[0099] The implementation steps of the above-mentioned multi-parameter joint calibration method are described in detail below. Optionally, according to some embodiments of this application, the above-mentioned current calibration of the multi-channel current sampling data corresponding to the anode current, gate current, and cathode current to obtain the current monitoring results of the turn-off thyristor-type device includes: Multi-channel signal time synchronization and amplitude calibration are performed on the multi-channel current sampling data to obtain the calibrated multi-channel intermediate signal; Based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraints of the anode current, gate current and cathode current, and the multi-channel intermediate signal is biased and corrected based on the residual to obtain the multi-channel corrected signal. By utilizing the dynamic characteristics of anode current, gate current, and cathode current, multi-channel correction signals are fused to obtain preliminary fusion results. The weighted projection algorithm is used to correct the preliminary fusion results, and the current estimation results of anode current, gate current and cathode current are output. Based on the current estimation results, the current monitoring results of turn-off thyristor devices are determined.

[0100] Optionally, according to some embodiments of this application, based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraints of the anode current, gate current, and cathode current, and the multi-channel intermediate signal is biased and corrected based on the residual to obtain a multi-channel corrected signal, including: Based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraint, and the slowly varying component of the residual is extracted. Based on the slowly varying components of the residuals and the preset weighted allocation principle, the first bias estimate corresponding to the anode current, the second bias estimate corresponding to the gate current, and the third bias estimate corresponding to the cathode current are determined. Based on the first bias estimate, the second bias estimate, and the third bias estimate, the multi-channel intermediate signal is biased and corrected to obtain the multi-channel corrected signal.

[0101] Optionally, according to some embodiments of this application, the current monitoring results of the turn-off thyristor-type device are determined based on the current estimation results, including: The measurement residuals corresponding to the anode current, gate current, and cathode current are obtained respectively, and the current estimation results are dynamically weighted based on the measurement residuals to obtain the current monitoring results of turn-off thyristor devices.

[0102] The following is a specific example illustrating the multi-parameter joint calibration method, which mainly includes the following steps: multi-channel signal acquisition and modeling, signal time synchronization and initial amplitude calibration, constraint residual extraction and bias tracking, multi-channel complementary fusion processing and constraint projection, dynamic weight adjustment and abnormal channel suppression, and result output.

[0103] 1. Multi-channel acquisition and modeling: Acquiring anode current signals Cathode current signal AND gate current signal And establish a unified measurement model for the anode current signal. Cathode current signal AND gate current signal The measurement model established based on the multi-channel current sampling data in the aforementioned embodiments is as follows: (1) In equation (1), This indicates the expected ideal current output value. Indicates the zero-point drift or bias of the sensor. This represents the noise term. To ensure signal sampling integrity, the sampling frequency can be selected to be no less than 5 to 10 times the highest effective bandwidth of the measured current.

[0104] Signal time synchronization and initial amplitude calibration: Determine the time delay difference of each channel based on the synchronization trigger pulse, rising edge, or external clock reference in the three-channel signal. Signal alignment is achieved through a time compensation algorithm. Subsequently, preliminary amplitude calibration is performed on the three-channel signals, eliminating gain inconsistencies and zero-point offsets through static calibration or short-time averaging, thereby obtaining the preliminary calibrated multi-channel intermediate signal. This provides consistent timing and constraint-based consistent projection correction for subsequent fusion processing.

[0105] 2. Constrained Residual Extraction and Bias Tracking: Based on the current conservation constraints of anode current, gate current, and cathode current, calculate the real-time residuals: (2) Next, bias correction is applied to the multi-channel intermediate signals based on the residuals to obtain the multi-channel corrected signals. For example, the slowly varying components of the residuals are extracted using low-pass filtering or moving average methods to estimate the combined error term of the three-channel biases. Using a weighted allocation principle, the bias allocation ratio is determined based on the accuracy or noise level of each sensor, and the bias estimate for each channel is updated. This includes a first bias estimate corresponding to the anode current, a second bias estimate corresponding to the gate current, and a third bias estimate corresponding to the cathode current. Finally, the multi-channel intermediate signals are biased and corrected to obtain the multi-channel corrected signals. The correction method is as shown in equation (3): (3) This step can effectively suppress the accumulation of zero-point errors caused by sensor drift or temperature changes.

[0106] 3. Multi-channel complementary fusion processing: In this step, based on the dynamic characteristics of each channel, that is, using the dynamic characteristics of the anode current, gate current and cathode current, the multi-channel correction signal is fused to obtain a preliminary fusion result. Specifically, the dynamic characteristics of each channel are used to construct a frequency domain complementary fusion structure. For example, the channel with high bandwidth but high noise (such as the anode current) is taken as the fast component, and the channel with low noise but slow response (such as the cathode and gate current) is taken as the slow component. By designing a complementary filter bank, a high-pass filter is applied to the fast component and a low-pass filter is applied to the slow component. The two are then weighted and superimposed to achieve a balance between dynamic response and steady-state accuracy. For example, the multi-channel correction signal is fused to obtain the preliminary fusion result of the anode current. The estimation of the anode current can be expressed as Equation (4): (4) In equation (4), and These are high-pass and low-pass operators, respectively. This complementary fusion method preserves high-speed transient characteristics without significantly amplifying noise.

[0107] Next, consistency projection correction based on constraint relationship: To ensure that the final result strictly satisfies the current conservation relationship, the preliminary fusion results of the three channels obtained in the previous steps are combined into a vector, as shown in equation (5): (5) And establish the constraint matrix, as shown in equation (6): (6) The initial fusion results are corrected for consistency using a weighted projection method, and the current estimates of the anode current, gate current, and cathode current are output; as shown in equation (7): (7) In equation (7), This is the weight matrix for each channel, used to reflect the reliability of different sensors. After this correction, the output three-channel current estimation results are... , , Numerical constraints are strictly met to avoid error drift caused by noise accumulation.

[0108] 4. Dynamic Weight Adjustment and Abnormal Channel Suppression: In this step, the measurement residuals corresponding to the anode current, gate current, and cathode current are obtained, and the current estimation results are dynamically weighted based on the measurement residuals to obtain the current monitoring results for turn-off thyristor devices. Specifically, during system operation, the measurement residuals of each channel are calculated in real time. : (8) In equation (8), the channel status is determined based on the trend of the amplitude and variance of the residuals. When a signal experiences a sudden increase in noise, saturation distortion, or abnormal drift, the weight of that channel is automatically reduced or it is temporarily blocked to prevent abnormal signals from interfering with the fusion results. The system recalculates the constraint fusion based on the remaining effective channels to maintain the stability and continuity of the detection results. Simultaneously, the weighting matrix can be dynamically adjusted based on the residual information. This enables adaptive optimization, ensuring that the system maintains optimal fusion performance under different operating conditions.

[0109] 5. Output Results: After constraint correction and dynamic optimization, the system outputs the final fused and adjusted current estimation results: The final current monitoring results for the turn-off thyristor devices are obtained.

[0110] In practical applications, these results can be directly used for the analysis of the turn-on and turn-off processes of power devices, junction temperature inversion, and health status assessment. They can also be used as real-time feedback input for drive control and protection modules, thereby significantly improving the safety and operational reliability of power modules.

[0111] The DC bias elimination method provided in the embodiments of this application is described below. Optionally, according to some embodiments of this application, current calibration is performed on the multi-channel current sampling data corresponding to the anode current, gate current, and cathode current to obtain the current monitoring results of the turn-off thyristor-type device, including: Upon receiving the activation command, record the multi-channel current values ​​corresponding to the anode current, gate current, and cathode current. During the time period from the turn-on command to the next turn-off command, the multi-channel current sampling data is biased and corrected based on the multi-channel current values ​​to obtain the current monitoring results of the turn-off thyristor-type devices.

[0112] Specifically, the DC bias elimination method mainly includes the following steps: bias evaluation and storage, DC bias elimination, and bias reset, as detailed below.

[0113] 1. Bias Evaluation Storage: When a turn-off thyristor receives an on command, since the drive has not yet activated, the turn-off thyristor is in a steady-state blocking state, and the coil current... Theoretically, it should be zero. The main control unit or host computer records the current value output by the Rogowski coil at this time. This allows us to obtain the multi-channel current values ​​corresponding to the anode current, gate current, and cathode current.

[0114] 2. DC bias elimination: The current value measured by the Rogowski coil during the time period from when the turn-off thyristor receives the turn-on command to when the next turn-off command is received. All include actual current values. With bias Therefore, bias correction is performed on the multi-channel current sampling data based on the multi-channel current values ​​to obtain the current monitoring results of turn-off thyristor devices. The specific expression is Equation (9): (9) 3. Bias Reset: After a turn-off command is received by a turn-off thyristor device, the bias current value of the main control unit or host computer is reset. Reset to zero, awaiting the next activation command.

[0115] Overall, the embodiments of this application address the current inability to monitor the cathode current of turn-off thyristor devices. and gate current Addressing the issues of low current monitoring accuracy in turn-off thyristor devices, this application proposes a high-precision method for measuring the anode, cathode, and gate currents of turn-off thyristors. This method fills a gap in the measurement of cathode current in turn-off thyristors. and gate current This invention fills the measurement gap and improves the accuracy of current measurement for turn-off thyristors from both hardware circuit design and software algorithm perspectives. This enables accurate monitoring and diagnosis of the full operating state of turn-off thyristors, improves their operational reliability and lifespan, and ensures the stable operation of power electronic systems.

[0116] Based on the Rogowski coil-based current monitoring method for turn-off thyristor devices provided in the above embodiments, and with the same inventive concept, this application also provides a Rogowski coil-based current monitoring device for turn-off thyristor devices, corresponding to the above-described Rogowski coil-based current monitoring method. The following describes... Figure 15This paper provides a detailed introduction to current monitoring equipment for turn-off thyristor devices based on Rogowski coils.

[0117] Please see below. Figure 15 , Figure 15 This is a schematic diagram of the structure of a current monitoring device for a turn-off thyristor-type device based on a Rogowski coil, provided in one embodiment of this application.

[0118] A current monitoring device for turn-off thyristor-type devices based on Rogowski coils may include a processor 1501 and a memory 1502 storing computer program instructions.

[0119] Specifically, the processor 1501 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0120] Memory 1502 may include mass storage for data or instructions. For example, and not limitingly, memory 1502 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 1502 may include removable or non-removable (or fixed) media. Where appropriate, memory 1502 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 1502 is non-volatile solid-state memory.

[0121] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the methods according to one aspect of this disclosure.

[0122] The processor 1501 reads and executes computer program instructions stored in the memory 1502 to implement any of the current monitoring methods for turn-off thyristor devices based on Rogowski coils in the above embodiments.

[0123] In one example, the current monitoring device for a Rogowski coil-based turn-off thyristor device may also include a communication interface 1503 and a bus 1510. For example, Figure 15 As shown, the processor 1501, memory 1502, and communication interface 1503 are connected through bus 1510 and complete communication with each other.

[0124] The communication interface 1503 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0125] Bus 1510 includes hardware, software, or both, that couples components of a Rogowski coil-based turn-off thyristor-type device current monitoring device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 1510 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0126] The Rogowski coil-based current monitoring device for turn-off thyristors executes the Rogowski coil-based current monitoring method for turn-off thyristors described in the embodiments of this application, thereby realizing the Rogowski coil-based current monitoring method for turn-off thyristors described in the embodiments of this application.

[0127] Furthermore, in conjunction with the Rogowski coil-based current monitoring method for turn-off thyristor devices described in the above embodiments, this application embodiment can provide a computer storage medium for implementation. This computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the Rogowski coil-based current monitoring methods for turn-off thyristor devices described in the above embodiments.

[0128] Based on the Rogowski coil-based current monitoring method for turn-off thyristor devices described in the above embodiments, this application provides a computer program product. When the instructions in the computer program product are executed by the processor of an electronic device, the electronic device performs the Rogowski coil-based current monitoring method for turn-off thyristor devices provided in any of the above embodiments of this application.

[0129] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0130] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0131] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0132] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0133] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A current monitoring device for turn-off thyristor-type devices based on Rogowski coils, characterized in that, The device includes: At least one Rogowski coil, including at least one of a first Rogowski coil, a second Rogowski coil, and a third Rogowski coil, wherein the first Rogowski coil is used to acquire an induced signal corresponding to the anode current of the turn-off thyristor-like device, the second Rogowski coil is used to acquire an induced signal corresponding to the gate current of the turn-off thyristor-like device, and the third Rogowski coil is used to acquire an induced signal corresponding to the cathode current of the turn-off thyristor-like device, wherein at least one of the first Rogowski coil, the second Rogowski coil, and the third Rogowski coil is a PCB-type Rogowski coil; At least one signal processing circuit is electrically connected to the corresponding Rogowski coil. The signal processing circuit includes an amplification circuit, an integration circuit, and an analog-to-digital conversion circuit. The signal processing circuit is used to integrate and amplify the received induced signal to obtain a current measurement signal, and to perform analog-to-digital conversion processing on the current measurement signal to obtain current sampling data. The main control unit is electrically connected to the analog-to-digital conversion circuit and is used to receive the current sampling data and output the current monitoring result of the turn-off thyristor device based on the current sampling data.

2. The apparatus according to claim 1, characterized in that, The integrating circuit is configured to have a reset function, and the main control unit is also electrically connected to the integrating circuit. The main control unit is also used to receive the instruction signal from the drive unit of the turn-off thyristor device, and output an integral reset control signal to the integral circuit based on the instruction signal, so as to control the integral circuit to switch between the integral working state and the integral reset state.

3. The apparatus according to claim 1, characterized in that, The first Rogowski coil is an externally clipped PCB Rogowski coil; The externally clip-on PCB Rogowski coil includes an integrated insulation structure and a closed coil structure. The closed coil structure is arranged on the integrated insulation structure, which is used to fix it above the gate terminal area of ​​the turn-off thyristor device in a snap-fit ​​manner.

4. The apparatus according to claim 3, characterized in that, The integrated insulation structure includes a first hollow ring and a second hollow ring connected vertically. The first hollow ring is used to form a snap-fit ​​structure, and the first hollow ring and / or the second hollow ring are used to support the closed coil structure. Wherein, the inner diameter of the first hollow ring is equal to or greater than the diameter of the anode terminal of the turn-off thyristor device, and the height of the first hollow ring is equal to or greater than the height of the gate terminal of the turn-off thyristor device.

5. The apparatus according to claim 4, characterized in that, The inner diameter of the second hollow ring is smaller than the inner diameter of the first hollow ring.

6. The apparatus according to any one of claims 3 to 5, characterized in that, The integrated insulation structure is a structure made of PCB board or insulating material.

7. The apparatus according to claim 1, characterized in that, The second Rogowski coil is a planar PCB Rogowski coil; The planar PCB Rogowski coil is disposed in the blank PCB area between the gate cathode interface and the drive circuit element area on the drive unit PCB of the turn-off thyristor-type device, and the coil structure of the planar PCB Rogowski coil is arranged in the middle layer of the blank PCB area.

8. The apparatus according to claim 7, characterized in that, The intermediate layer corresponding to the blank PCB board area does not have any other potential distribution layers besides the coil structure; Furthermore, the gate potential layer and cathode potential layer of the turn-off thyristor-type device are respectively arranged on the upper and lower sides of the middle layer where the coil structure is located, so that the loop magnetic field of the gate current is coupled to the planar PCB Rogowski coil.

9. The apparatus according to claim 1, characterized in that, The third Rogowski coil is a toroidal PCB Rogowski coil; The annular PCB Rogowski coil is arranged around the annular interface connecting the drive unit of the turn-off thyristor device to the device package, and the coil structure of the annular PCB Rogowski coil is arranged in the middle layer of the PCB board of the drive unit for measuring the cathode current of the turn-off thyristor device.

10. The apparatus according to claim 1, characterized in that, The third Rogowski coil is an embedded Rogowski coil; The embedded Rogowski coil adopts a flexible Rogowski coil structure, which is arranged in the gap inside the cathode terminal of the turn-off thyristor-like device package by embedding wires. The flexible Rogowski coil structure leads out a coil output terminal through the notch connecting the drive unit of the turn-off thyristor device and the package. The coil output terminal is used to electrically connect to the signal processing circuit.

11. The apparatus according to claim 1, characterized in that, At least one of the first Rogowski coil, the second Rogowski coil, and the third Rogowski coil adopts a differential coil structure; The differential coil structure includes a first coil plane structure and a second coil plane structure located in two different intermediate layers. The first coil plane structure and the second coil plane structure are connected by a vertical via to form a closed coil.

12. The apparatus according to claim 11, characterized in that, The output terminal of the differential coil structure is led out using a shielded wire structure and connected to the signal processing circuit.

13. The apparatus according to claim 1, characterized in that, The integrating circuit includes a passive integrating circuit and / or an active integrating circuit; The passive integrator circuit includes a first resistor and a first capacitor. The first end of the first resistor is electrically connected to the input terminal of the passive integrator circuit. The second end of the first resistor is electrically connected to the first end of the first capacitor and to the output terminal of the passive integrator circuit. The second end of the first capacitor is electrically connected to the ground terminal. A first switch is connected in parallel across the two ends of the first capacitor. The active integrator circuit includes an operational amplifier, a second resistor, and a second capacitor. The non-inverting input of the operational amplifier is electrically connected to the input of the active integrator circuit, and the output of the operational amplifier is electrically connected to the output of the active integrator circuit. The second resistor is disposed between the ground terminal and the inverting input of the operational amplifier, and the second capacitor is disposed between the inverting input of the operational amplifier and the output of the operational amplifier. A second switch is connected in parallel across the two ends of the second capacitor.

14. The apparatus according to claim 1, characterized in that, The signal processing circuit also includes a non-inverting amplifier circuit; The integrating circuit, the amplifying circuit, the non-inverting amplifying circuit, and the analog-to-digital converter circuit are connected in series in sequence, or the amplifying circuit, the integrating circuit, the non-inverting amplifying circuit, and the analog-to-digital converter circuit are connected in series in sequence. The non-inverting amplifier circuit is used to amplify the received signal a second time.

15. A method for monitoring the current of a turn-off thyristor-like device based on a Rogowski coil, characterized in that, The method, applied to the current monitoring device for a turn-off thyristor-type device based on a Rogowski coil as described in any one of claims 1-14, comprises: Acquire the current sampling data corresponding to the anode current, gate current and cathode current of the turn-off thyristor device; The current monitoring results of the turn-off thyristor device are obtained by performing current calibration on the multi-channel current sampling data corresponding to the anode current, the gate current, and the cathode current.

16. The method according to claim 15, characterized in that, The process of performing current calibration on the multi-channel current sampling data corresponding to the anode current, the gate current, and the cathode current to obtain the current monitoring results of the turn-off thyristor device includes: The multi-channel current sampling data is subjected to multi-channel signal time synchronization and amplitude calibration to obtain the calibrated multi-channel intermediate signal. Based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraints of the anode current, the gate current, and the cathode current, and the multi-channel intermediate signal is biased and corrected based on the residual to obtain the multi-channel corrected signal. By utilizing the dynamic characteristics of the anode current, the gate current, and the cathode current, the multi-channel correction signal is fused to obtain a preliminary fusion result. The preliminary fusion results are corrected using a weighted projection algorithm, and the current estimation results of the anode current, the gate current, and the cathode current are output. Based on the current estimation results, the current monitoring results of the turn-off thyristor-type devices are determined.

17. The method according to claim 16, characterized in that, The process involves calculating the residuals based on the multi-channel intermediate signals using the current conservation constraints of the anode current, the gate current, and the cathode current, and then applying a bias correction to the multi-channel intermediate signals based on these residuals to obtain a multi-channel corrected signal. This includes: Based on the multi-channel intermediate signal, the residual is calculated using the current conservation constraint, and the slowly varying component of the residual is extracted. Based on the slowly varying components of the residual and the preset weighted allocation principle, a first bias estimate corresponding to the anode current, a second bias estimate corresponding to the gate current, and a third bias estimate corresponding to the cathode current are determined. Based on the first bias estimate, the second bias estimate, and the third bias estimate, the multi-channel intermediate signal is biased and corrected to obtain the multi-channel corrected signal.

18. The method according to claim 16, characterized in that, The determination of the current monitoring result of the turn-off thyristor based on the current estimation result includes: The measurement residuals corresponding to the anode current, the gate current, and the cathode current are obtained respectively, and the current estimation results are dynamically weighted based on the measurement residuals to obtain the current monitoring results of the turn-off thyristor device.

19. The method according to claim 15, characterized in that, The process of performing current calibration on the multi-channel current sampling data corresponding to the anode current, the gate current, and the cathode current to obtain the current monitoring results of the turn-off thyristor device includes: Upon receiving the activation command, record the multi-channel current values ​​corresponding to the anode current, the gate current, and the cathode current; During the time period from the turn-on command to the next turn-off command, the multi-channel current sampling data is biased and corrected based on the multi-channel current value to obtain the current monitoring result of the turn-off thyristor device.

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