A power electronic switch electrical communication system and method

Abstract

The present invention relates to the field of electronic switch technology, and specifically discloses an electrical communication system and method for a power electronic switch, wherein the system includes an acquisition module, a first processing module, a second processing module, a packaging module, and an upload module; the system solves signal pollution, isolation requirements, and rapid response problems through local rapid protection judgment and execution, combined with electrical isolation and differential signal conversion and anti-interference communication links. By combining distributed processing with centralized control, it can ensure the integrity, transmission speed, and protection timeliness of feedback signals in high electromagnetic interference, distributed architecture, and high-voltage isolation environments, effectively improving the reliability and safety of equipment operation.

Description

Technical Field

[0001] The present application relates to the technical field of electronic switches, and in particular to an electrical communication system and method for power electronic switches. Background Art

[0002] Power electronic conversion equipment, as core equipment in the industrial, energy, and transportation sectors, requires high-frequency power electronic switching devices to achieve power conversion and control. In high-power applications, the equipment adopts a modular design, resulting in a distributed layout of switch modules and centralized management by a central control unit, necessitating the construction of a reliable communication system across isolation barriers.

[0003] However, power electronic switching devices generate strong electromagnetic interference (EMI) during high-frequency switching. This interference contaminates feedback signals through spatial radiation and wire coupling. Analog signals and sensitive digital signals are particularly susceptible to common-mode noise. This signal contamination can cause control system inaccuracies and even cause protection functions to fail. At the same time, the need for electrical isolation in high-voltage applications further limits the bandwidth and timeliness of signal transmission. Traditional communication solutions often struggle to strike a balance between high anti-interference capabilities and high-speed transmission performance. Especially in protection scenarios requiring microsecond-level rapid response, misjudgments or transmission delays caused by noise can damage expensive power electronic devices or cause entire systems to shut down. Therefore, in applications with high electromagnetic interference and distributed architectures, there is an urgent need for a communication technology that can integrate local fast protection and highly anti-interference digital transmission to ensure the integrity and reliability of feedback signals, thereby supporting the safe, stable, and efficient operation of power electronic equipment.

[0004] There is currently no effective technical solution to the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a power electronic switch electrical communication system and method to solve the problems of signal pollution, isolation requirements and rapid response, so as to achieve local rapid protection and anti-interference digital transmission functions.

[0006] In a first aspect, the present application provides a power electronic switch electrical communication system, which is applied in a power electronic conversion device, and the system includes:

[0007] An acquisition module is used to collect analog feedback signals and digital feedback signals of power electronic conversion equipment through a signal acquisition interface;

[0008] The first processing module is used to perform conditioning, analog-to-digital conversion and preliminary digital filtering on the analog feedback signal to obtain a digitized analog feedback signal;

[0009] a second processing module, configured to use a high-speed comparator to perform level determination on a protection signal requiring a rapid response in the digital feedback signal through a digital signal processing path to obtain a protection determination result, and, when the protection determination result meets a protection condition, generate a local shutdown signal through a local protection execution unit, wherein the local shutdown signal acts on a gate drive circuit of the power electronic conversion device to execute a local shutdown action;

[0010] The packaging module is used to package the digitized analog feedback signal and the protection judgment result into a data frame through the local communication interface unit, perform electrical isolation and differential signal conversion, and obtain a differential digital signal;

[0011] The upload module is used to send the differential digital signal to the central control unit through an anti-interference digital communication link, so that the central control unit can perform one or more actions including data processing, control decision-making and protection judgment.

[0012] The power electronic switch electrical communication system provided in this application solves the problems of signal pollution, isolation requirements and rapid response through local rapid protection judgment and execution, combined with electrical isolation and differential signal conversion and anti-interference communication links. It combines distributed processing with centralized control. In high electromagnetic interference, distributed architecture and high-voltage isolation environments, it can ensure the integrity, transmission speed and protection timeliness of feedback signals, effectively improving the reliability and safety of equipment operation.

[0013] In a second aspect, the present application further provides a power electronic switch electrical communication method, which is applied in a power electronic conversion device, and the method comprises the following steps:

[0014] S1. Collect analog feedback signals and digital feedback signals of power electronic conversion equipment through the signal acquisition interface;

[0015] S2, conditioning, analog-to-digital conversion and preliminary digital filtering of the analog feedback signal to obtain a digitized analog feedback signal;

[0016] S3. Using a high-speed comparator through a digital signal processing path, a level determination is performed on a protection signal requiring a rapid response in the digital feedback signal to obtain a protection determination result. When the protection determination result meets a protection condition, a local protection execution unit generates a local shutdown signal. The local shutdown signal acts on a gate drive circuit of the power electronic conversion device to perform a local shutdown action.

[0017] S4. Through the local communication interface unit, the digitized analog feedback signal and the protection judgment result are packaged into a data frame, and electrical isolation and differential signal conversion are performed to obtain a differential digital signal;

[0018] S5. Send the differential digital signal to the central control unit through the anti-interference digital communication link, so that the central control unit can perform one or more actions among data processing, control decision-making and protection judgment.

[0019] The method proposed in this application is applied to the power electronic switch electrical communication system provided in the first aspect. It solves the problems of signal pollution, isolation requirements and rapid response through local rapid protection judgment and execution, combined with electrical isolation and differential signal conversion and anti-interference communication links. It combines distributed processing with centralized control. In high electromagnetic interference, distributed architecture and high-voltage isolation environment, it can ensure the integrity, transmission speed and protection timeliness of the feedback signal, effectively improving the reliability and safety of equipment operation.

[0020] In the power electronic switch electrical communication method, in step S3, the step of performing level judgment on the protection signal requiring a rapid response in the digital feedback signal using a high-speed comparator through a digital signal processing path to obtain a protection judgment result includes:

[0021] S31. Digitally filter the digital feedback signal using a digital signal processing path to obtain a filtered digital feedback signal, and determine the amplitude of the filtered digital feedback signal;

[0022] S32. Use the high-speed comparator to compare the amplitude of the protection signal that needs a quick response in the filtered digital feedback signal with the preset signal threshold to generate a comparison result, and use the anti-interference module to sample the comparison result multiple times. If the number of consecutive and consistent comparison results sampled by the anti-interference module reaches a preset number, the comparison result is determined to be valid, and the comparison result is output as the protection judgment result.

[0023] This series of steps ensures that only real and persistent signal anomalies will trigger rapid protection actions, significantly improving the accuracy and reliability of protection judgments and avoiding false shutdowns or protection failures caused by noise.

[0024] In the power electronic switch electrical communication method, in step S31, the digital signal processing path includes an adaptive filter, and the adaptive filter includes:

[0025] A noise estimation module, used for estimating the noise power spectrum density of the digital feedback signal in real time;

[0026] A filter parameter adjustment module, configured to calculate and adjust the filter coefficients of the filter module according to the noise power spectrum density;

[0027] The filtering module is used to perform digital filtering on the digital feedback signal.

[0028] In this way, even if the noise in the digital feedback signal changes with time or operating conditions, the adaptive filter can continue to effectively suppress the noise, thereby improving the accuracy of the filtered digital feedback signal, thereby improving the reliability of subsequent protection judgments and avoiding misjudgments or delays caused by noise.

[0029] In the power electronic switch electrical communication method, the process of calculating and adjusting the filter coefficient of the filter module according to the noise power spectrum density includes:

[0030] A1. Inputting the noise power spectrum density into an adaptive step size factor calculation module, so as to calculate a normalized noise power based on the noise power spectrum density by the adaptive step size factor calculation module;

[0031] A2. Calculating an adaptive step size factor using a nonlinear function according to the normalized noise power;

[0032] A3. Adopting an adaptive step size factor and using a minimum mean square error algorithm, the filter coefficients are updated and adjusted.

[0033] In the power electronic switch electrical communication method, in step S31, the process of determining the amplitude of the filtered digital feedback signal includes:

[0034] The filtered digital feedback signal is obtained, and a root mean square value of the filtered digital feedback signal is calculated as the amplitude of the filtered digital feedback signal.

[0035] The power electronic switch electrical communication method, wherein the local protection execution unit has a shutdown timer;

[0036] When the protection judgment result meets the protection condition, a local protection execution unit generates a local shutdown signal, and the local shutdown signal acts on the gate drive circuit of the power electronic conversion device to perform a local shutdown action. The process includes:

[0037] B1. When the protection judgment result meets the protection condition, the protection judgment result is sent to the local protection execution unit, so that the local protection execution unit starts a shutdown timer for timing, and the shutdown timer is configured with a shutdown time threshold and a dead time parameter;

[0038] B2. During the timing of the shutdown timer, the local protection execution unit continuously outputs an enable signal to the shutdown control input terminal of the gate drive circuit, and interlocks the upper and lower bridge arm drive signals of the gate drive circuit according to the dead time parameter;

[0039] B3. When the shutdown timer reaches the shutdown time threshold, the local protection execution unit stops outputting the enable signal to the shutdown control input terminal of the gate drive circuit, releases the interlocking control of the upper and lower bridge arm drive signals of the gate drive circuit, and completes the local shutdown action.

[0040] The power electronic switch electrical communication method, wherein step S4 comprises:

[0041] S41. Construct a data frame, where the data frame includes a frame header, a data payload, and a frame trailer, where the data payload includes a digitized analog feedback signal and a protection judgment result;

[0042] S42. Calculate the CRC check code of the data payload according to a preset CRC check algorithm, and add the CRC check code to the end of the data frame to obtain a data frame including the CRC check code;

[0043] S43, electrically isolating the data frame containing the CRC checksum through an isolation chip to obtain an isolated data frame;

[0044] S44 , performing differential signal conversion on the isolated data frame through a differential signal driver to obtain a differential digital signal.

[0045] In the power electronic switch electrical communication method, in step S2, the conditioning process includes filtering, amplification and level adjustment performed based on the signal conditioning circuit.

[0046] In the power electronic switch electrical communication method, in step S2, the preliminary digital filtering is a mean filter or a low-pass filter.

[0047] From the above, it can be seen that the present application provides a power electronic switch electrical communication system and method, wherein the power electronic switch electrical communication system provided by the present application solves the problems of signal pollution, isolation requirements and rapid response through local rapid protection judgment and execution, combined with electrical isolation and differential signal conversion and anti-interference communication links. It combines distributed processing with centralized control, and can ensure the integrity, transmission speed and protection timeliness of the feedback signal in high electromagnetic interference, distributed architecture and high-voltage isolation environment, thereby effectively improving the reliability and safety of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the structure of the power electronic switch electrical communication system provided in an embodiment of the present application.

[0049] Figure 2 Schematic diagram of the structure of the second processing module.

[0050] Figure 3 Flowchart of the power electronic switch electrical communication method provided in an embodiment of the present application.

[0051] Figure numerals: 101, acquisition module; 102, first processing module; 103, second processing module; 104, packaging module; 105, upload module; 110, power electronic conversion equipment; 111, signal acquisition interface; 112, gate drive circuit; 113, anti-interference digital communication link; 114, central control unit. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present application.

[0053] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0054] First, please refer to Figure 1 Some embodiments of the present application provide a power electronic switch electrical communication system, which is applied in a power electronic conversion device 110. The system includes:

[0055] The acquisition module 101 is used to collect analog feedback signals and digital feedback signals of the power electronic conversion device 110 through the signal acquisition interface 111;

[0056] The first processing module 102 is used to perform conditioning, analog-to-digital conversion and preliminary digital filtering on the analog feedback signal to obtain a digitized analog feedback signal;

[0057] The second processing module 103 is configured to perform level determination on the protection signal requiring a rapid response in the digital feedback signal using a high-speed comparator through a digital signal processing path to obtain a protection determination result. When the protection determination result meets the protection condition, the local protection execution unit generates a local shutdown signal. The local shutdown signal acts on the gate drive circuit 112 of the power electronic converter 110 to execute a local shutdown action.

[0058] The packaging module 104 is used to package the digitized analog feedback signal and the protection judgment result into a data frame through the local communication interface unit, perform electrical isolation and differential signal conversion, and obtain a differential digital signal;

[0059] The upload module 105 is used to send the differential digital signal to the central control unit 114 through the anti-interference digital communication link 113, so that the central control unit 114 can perform one or more actions of data processing, control decision-making and protection judgment.

[0060] Specifically, the acquisition module 101 is connected to the power electronic conversion device 110 via the signal acquisition interface 111 to receive analog feedback signals and digital feedback signals. The analog feedback signals can come from current sensors or voltage sensors, while the digital feedback signals can come from status monitoring points.

[0061] More specifically, the first processing module 102 receives the analog feedback signal and includes a signal conditioning circuit, an analog-to-digital converter, and a digital filter. The signal conditioning circuit pre-processes the analog signal, the analog-to-digital converter converts the conditioned analog signal into a digital signal, and the digital filter performs preliminary filtering on the digital signal to suppress noise.

[0062] More specifically, the second processing module 103 receives the digital feedback signal. Its digital signal processing path includes a high-speed comparator and a local protection execution unit. The high-speed comparator is used to quickly determine whether the level of the protection signal required by the digital feedback signal exceeds a preset threshold. The local protection execution unit is connected to the high-speed comparator and, if the judgment result meets the protection condition, directly outputs a local shutdown signal to the gate drive circuit 112 of the power electronic converter 110.

[0063] More specifically, the packaging module 104 connects to the first processing module 102 and the second processing module 103 via a local communication interface unit, receiving the digitized analog feedback signal and protection judgment results. The packaging module 104 internally includes data frame construction logic, an electrical isolation unit, and a differential signal driver. The data frame construction logic organizes the received data into data frames. The electrical isolation unit isolates the data frames, with the isolation voltage level matching the device voltage level. The differential signal driver converts the isolated signals into differential form.

[0064] More specifically, the upload module 105 is connected to the differential signal driver of the packaging module 104 and is connected to the central control unit 114 via the anti-interference digital communication link 113 for transmitting differential digital signals.

[0065] More specifically, the system of the present application operates as follows: The acquisition module 101 first collects analog and digital feedback signals from the power electronic converter 110. The analog feedback signal enters the first processing module 102, where it undergoes filtering, amplification, and level adjustment by the signal conditioning circuit to improve signal quality. The conditioned analog signal is converted to a digital signal by an analog-to-digital converter, followed by preliminary digital filtering to further remove noise, resulting in a digitized analog feedback signal. The digital feedback signal enters the digital signal processing path of the second processing module 103. A high-speed comparator performs level determination on protection signals requiring a rapid response. When the high-speed comparator's determination indicates that the signal meets the protection condition, the local protection execution unit immediately responds by generating a local shutdown signal. The local shutdown signal directly acts on the gate drive circuit 112 of the power electronic converter 110, prompting the power electronic switching device to quickly shut down, executing the local protection action. This local fast protection mechanism bypasses communication delays with the central control unit 114, improving the system's response speed in emergency situations and preventing equipment damage. Simultaneously, the digitized analog feedback signal and the protection determination result from the high-speed comparator are sent to the packaging module 104. The packaging module 104 packages this data into data frames through the local communication interface unit. To ensure safety and anti-interference capabilities, the data frames are electrically isolated by the electrical isolation unit, effectively isolating the high-voltage side from the low-voltage side. The isolated data frames are then converted into differential digital signals by the differential signal driver. Differential signal transmission improves the signal's ability to resist common-mode noise. Finally, the upload module 105 sends the differential digital signal to the remote central control unit 114 through the anti-interference digital communication link 113. After receiving the data, the central control unit 114 can perform more complex data processing, control decisions, or high-level protection judgments to achieve monitoring and management of the entire power electronic conversion device 110.

[0066] By combining the above-mentioned distributed processing with centralized control, the power electronic switch electrical communication system of the present application can ensure the integrity, transmission speed and protection timeliness of the feedback signal under high electromagnetic interference, distributed architecture and high-voltage isolation environment, thereby improving the reliability and safety of equipment operation.

[0067] From the above, it can be seen that the power electronic switch electrical communication system provided by this application solves the problems of signal pollution, isolation requirements and rapid response through local rapid protection judgment and execution, combined with electrical isolation and differential signal conversion and anti-interference communication links. It combines distributed processing with centralized control. In high electromagnetic interference, distributed architecture and high-voltage isolation environment, it can ensure the integrity, transmission speed and protection timeliness of the feedback signal, effectively improving the reliability and safety of equipment operation.

[0068] Second, please refer to Figure 2 and Figure 3 Some embodiments of the present application further provide a power electronic switch electrical communication method, which is applied in a power electronic conversion device 110. The method includes the following steps:

[0069] S1. Collect analog feedback signals and digital feedback signals from the power electronic conversion device 110 through the signal acquisition interface 111;

[0070] S2, conditioning, analog-to-digital conversion and preliminary digital filtering of the analog feedback signal to obtain a digitized analog feedback signal;

[0071] S3. Using a high-speed comparator through a digital signal processing path, a level determination is performed on the protection signal requiring a quick response in the digital feedback signal to obtain a protection determination result. When the protection determination result meets the protection condition, a local protection execution unit generates a local shutdown signal. The local shutdown signal acts on the gate drive circuit 112 of the power electronic converter 110 to perform a local shutdown operation.

[0072] S4. Through the local communication interface unit, the digitized analog feedback signal and the protection judgment result are packaged into a data frame, and electrical isolation and differential signal conversion are performed to obtain a differential digital signal;

[0073] S5. Send the differential digital signal to the central control unit 114 through the anti-interference digital communication link 113, so that the central control unit 114 can perform one or more actions among data processing, control decision-making and protection judgment.

[0074] The method proposed in this application is applied to the power electronic switch electrical communication system provided in the first aspect. It solves the problems of signal pollution, isolation requirements and rapid response through local rapid protection judgment and execution, combined with electrical isolation and differential signal conversion and anti-interference communication links. It combines distributed processing with centralized control. In high electromagnetic interference, distributed architecture and high-voltage isolation environment, it can ensure the integrity, transmission speed and protection timeliness of the feedback signal, effectively improving the reliability and safety of equipment operation.

[0075] In some preferred embodiments, in step S3, the step of performing level determination on the protection signal requiring a rapid response in the digital feedback signal using a high-speed comparator through a digital signal processing path to obtain a protection determination result includes:

[0076] S31. Digitally filter the digital feedback signal using a digital signal processing path to obtain a filtered digital feedback signal, and determine the amplitude of the filtered digital feedback signal;

[0077] S32. Use a high-speed comparator to compare the amplitude of the protection signal that requires a quick response in the filtered digital feedback signal with the preset signal threshold to generate a comparison result, and use the anti-interference module to sample the comparison result multiple times. If the number of consecutive and consistent comparison results sampled by the anti-interference module reaches a preset number, the comparison result is determined to be valid, and the comparison result is output as a protection judgment result.

[0078] Specifically, the digital signal processing pathway performs digital filtering on the digital feedback signal to remove noise and improve signal quality. After filtering, the signal amplitude is determined to provide a stable input for subsequent comparisons. This process reduces the impact of noise on signal amplitude judgment. Next, a high-speed comparator compares the amplitude of the protection signal requiring a rapid response within the filtered signal with a preset threshold to generate a preliminary judgment result. To enhance judgment reliability, the anti-interference module samples the comparison result multiple times. The validity of the comparison result is verified by determining the number of consecutive, consistent sampling times. The final protection judgment result is output only when the comparison result remains stable. This series of steps ensures that only genuine, persistent signal anomalies trigger rapid protection action, significantly improving the accuracy and reliability of protection judgments and avoiding false shutdowns or protection failures caused by noise. This mechanism, by introducing a time dimension for judgment, effectively suppresses false judgments caused by transient noise. Combined with the high-speed comparator in the digital signal processing pathway, it balances response efficiency and protection judgment reliability.

[0079] In some preferred embodiments, in step S31, the digital signal processing path further includes an adaptive filter, and the adaptive filter includes:

[0080] A noise estimation module, used for estimating the noise power spectrum density of the digital feedback signal in real time;

[0081] A filter parameter adjustment module is used to calculate and adjust the filter coefficient of the filter module according to the noise power spectrum density;

[0082] The filtering module is used to digitally filter the digital feedback signal.

[0083] Specifically, the noise estimation module is configured to analyze the input digital feedback signal in real time to determine the power spectral density of the noise therein. The filter parameter adjustment module is configured to receive the noise power spectral density information output by the noise estimation module and, based on this information, calculate and update the filter coefficients of the filtering module. The filtering module is configured to receive the digital feedback signal and filter the digital feedback signal using the current filter coefficients provided by the filter parameter adjustment module. The filtering characteristics of the filtering module can be dynamically adjusted based on the real-time estimated noise characteristics, thereby enabling the filtering process to dynamically adapt to changing noise environments.

[0084] More specifically, the noise estimation module performs real-time analysis on the input digital feedback signal, for example, by estimating the power spectral density of the noise in the signal through methods such as short-time Fourier transform. The filter parameter adjustment module calculates and updates the filter coefficients of the filter module based on the received noise power spectral density. This calculation process is performed dynamically to ensure that the filter coefficients can reflect the characteristics of the current noise. The filter module receives the original digital feedback signal and applies the latest filter coefficients calculated by the filter parameter adjustment module for digital filtering. In this way, even if the noise in the digital feedback signal changes with time or operating conditions, the adaptive filter can continue to effectively suppress the noise, thereby improving the accuracy of the digital feedback signal after filtering, and thereby improving the reliability of subsequent protection judgments, avoiding misjudgments or delays caused by noise.

[0085] In some preferred embodiments, the process of calculating and adjusting the filter coefficients of the filtering module according to the noise power spectrum density includes:

[0086] A1. Inputting the noise power spectrum density into the adaptive step size factor calculation module to calculate the normalized noise power based on the noise power spectrum density by the adaptive step size factor calculation module;

[0087] A2. Based on the normalized noise power, an adaptive step size factor is calculated using a nonlinear function;

[0088] A3. Adopting adaptive step size factor and updating and adjusting filter coefficients according to minimum mean square error algorithm.

[0089] Specifically, during the operation of the power electronic converter 110, the digital feedback signal may be affected by electromagnetic interference. To accurately extract signal information and make rapid protection decisions, the digital feedback signal needs to be filtered. An adaptive filter is used to perform this filtering task, and its performance depends on the adjustment of the filter coefficients. The noise estimation module estimates the noise power spectral density of the digital feedback signal in real time. This density reflects the distribution intensity of the noise at different frequencies. This noise power spectral density is input into the adaptive step size factor calculation module. This module calculates the normalized noise power based on the noise power spectral density. This normalized value represents the overall noise level. Based on the normalized noise power, an adaptive step size factor is calculated using a nonlinear function. This nonlinear function is designed so that when the noise level is high, the calculated step size factor is smaller, which helps maintain algorithm stability; when the noise level is low, the calculated step size factor is larger, which helps accelerate the convergence of the filter coefficients. This adaptive step size factor is used in conjunction with the minimum mean square error algorithm to iteratively update the filter coefficients of the adaptive filter. The minimum mean square error algorithm drives coefficient adjustment by minimizing the filter output error. By introducing an adaptive step size factor, the filter coefficient update process can dynamically adapt to changes in the noise environment, thereby improving the filter's convergence speed and steady-state filtering accuracy. More accurate and rapid filtering results are used in subsequent high-speed comparators for level judgment, reducing false or missed judgments caused by noise, improving the reliability and timeliness of local rapid protection actions, and ensuring safe operation of equipment in high-electromagnetic interference environments.

[0090] In some preferred embodiments, in step S31, the process of determining the amplitude of the filtered digital feedback signal includes:

[0091] The filtered digital feedback signal is obtained, and a root mean square value of the filtered digital feedback signal is calculated as the amplitude of the filtered digital feedback signal.

[0092] Specifically, the RMS operation involves squaring each sample value in the signal sequence, then calculating the average of these squared values, and finally taking the square root of the average value.

[0093] More specifically, calculating the RMS value to determine the amplitude of the filtered digital feedback signal yields a more stable and representative signal RMS value. The RMS value reflects the signal's energy level and has a certain suppressive effect on transient noise and fluctuations. Comparing this RMS amplitude with a preset threshold improves the accuracy of protection decisions and reduces misjudgments caused by transient signal variations or noise, thereby ensuring the safe operation of the power electronic converter 110.

[0094] In some preferred embodiments, the local protection execution unit has a shutdown timer;

[0095] When the protection judgment result meets the protection condition, a local shutdown signal is generated by the local protection execution unit. The local shutdown signal acts on the gate drive circuit 112 of the power electronic conversion device 110 to perform the local shutdown action. The process includes:

[0096] B1. When the protection judgment result meets the protection condition, the protection judgment result is sent to the local protection execution unit, so that the local protection execution unit starts the shutdown timer for timing. The shutdown timer is configured with the shutdown time threshold and dead time parameters;

[0097] B2. During the shutdown timer, the local protection execution unit continuously outputs an enable signal to the shutdown control input terminal of the gate drive circuit 112 and interlocks the upper and lower bridge arm drive signals of the gate drive circuit 112 according to the dead time parameter;

[0098] B3. When the shutdown timer reaches the shutdown time threshold, the local protection execution unit stops outputting the enable signal to the shutdown control input terminal of the gate drive circuit 112, and releases the interlock control of the upper and lower bridge arm drive signals of the gate drive circuit 112 to complete the local shutdown action.

[0099] Specifically, the interlock control prevents the upper and lower bridge arms from being turned on at the same time. The interlock control means that when the driving signal of one bridge arm is at a high level, the driving signal of the other bridge arm is forced to be pulled low.

[0100] More specifically, the above processing method solves the problems of timing control of local shutdown action, preventing the upper and lower bridge arms from being turned on at the same time, and controlling the shutdown duration.

[0101] More specifically, the local protection execution unit integrates a timer function, which is configured with a threshold for setting a turn-off duration and parameters for gate drive signal interlocking.

[0102] More specifically, when the protection judgment result meets the protection conditions, the local protection execution unit receives this result and starts an internal shutdown timer. The shutdown timer is configured with a shutdown time threshold, which determines the duration of the forced shutdown state, as well as a dead-time parameter for interlocking control of the gate drive signal. During the timer operation, the local protection execution unit continuously outputs an enable signal to the gate drive circuit 112, which forces the gate drive circuit 112 into the shutdown state, preventing the power electronic switching devices from turning on. Simultaneously, the local protection execution unit interlocks the upper and lower bridge drive signals output by the gate drive circuit 112 based on the dead-time parameter. This interlock control ensures that at any time, the drive signals for the upper and lower bridge arms do not cause both switching devices to turn on simultaneously, thereby preventing bridge arm short circuits. When the shutdown timer reaches the set shutdown time threshold, the local protection execution unit stops outputting the enable signal, releasing the forced shutdown state and interlock control of the gate drive circuit 112. At this point, the local shutdown operation is complete.

[0103] More specifically, through these steps, the method of the present application implements timing control of local protection shutdown actions, prevents simultaneous conduction of the upper and lower bridge arms, and controls the shutdown duration. The shutdown timer and time threshold provide shutdown duration control, meeting rapid protection requirements. Deadtime parameters and an interlock control mechanism prevent the risk of shoot-through in the upper and lower bridge arms, improving system reliability. A continuous output enable signal ensures that the switching device remains in the off state during the timing period. These technical features work together to address the timing and control issues faced when executing local shutdown actions in the power electronic converter 110.

[0104] In some preferred embodiments, step S4 includes:

[0105] S41. Construct a data frame, where the data frame includes a frame header, a data payload, and a frame trailer, where the data payload includes a digitized analog feedback signal and a protection judgment result;

[0106] S42. Calculate the CRC check code of the data payload according to a preset CRC check algorithm, and add the CRC check code to the end of the data frame to obtain a data frame including the CRC check code;

[0107] S43, electrically isolating the data frame containing the CRC checksum through an isolation chip to obtain an isolated data frame;

[0108] S44 , performing differential signal conversion on the isolated data frame through a differential signal driver to obtain a differential digital signal.

[0109] Specifically, the isolation voltage level of the isolation chip matches the voltage level of the power electronic conversion device 110 .

[0110] More specifically, the common mode rejection ratio of the differential signal driver is greater than a preset common mode rejection ratio threshold.

[0111] More specifically, the power electronic converter 110 generates strong electromagnetic interference during operation. This interference may enter the communication link through spatial radiation or wire coupling. In particular, when transmitting signals across an isolation barrier, the signals are susceptible to common-mode noise, leading to data transmission errors or loss. To address this issue, this solution first constructs a data frame before sending the data to the central control unit 114, combining the digitized analog feedback signal and the protection judgment result. Next, a checksum for the data payload is calculated using a preset CRC checksum algorithm and added to the end of the data frame. This enables the receiving end to detect whether errors occurred during data transmission, improving data integrity. Subsequently, the data frame containing the CRC checksum is electrically isolated by an isolation chip. This creates a physical barrier between the local communication interface unit and the anti-interference digital communication link 113, blocking direct coupling of high voltage or common-mode noise, protecting the low-voltage side circuit, and simultaneously meeting the high-voltage isolation requirements of the power electronic converter 110. The isolation voltage level of the isolation chip matches the voltage level of the power electronic converter 110, ensuring effective isolation. Finally, the isolated data frame undergoes differential signal conversion via a differential signal driver. This differential signal transmission method effectively suppresses common-mode noise, improving the signal's anti-interference capability. The common-mode rejection ratio of the differential signal driver exceeds a preset threshold, further enhancing common-mode noise suppression. Through these steps, the digitized analog feedback signal and protection judgment results are reliably and accurately transmitted to the central control unit 114.

[0112] In some preferred embodiments, in step S2, the conditioning process includes filtering, amplification, and level adjustment performed by a signal conditioning circuit.

[0113] Specifically, in this embodiment, the collected analog feedback signal first enters the signal conditioning circuit. In this circuit, the signal is filtered to remove noise and interference components superimposed on the useful signal, thereby improving the purity of the signal. The filtered signal is then sent to the amplifier circuit, and its amplitude is increased to a level suitable for the input range of the analog-to-digital converter, which helps to fully utilize the range of the analog-to-digital converter and improve the conversion accuracy. Finally, the signal passes through the level adjustment circuit, and its DC bias is changed to ensure that the signal voltage range matches the input voltage range of the analog-to-digital converter, avoiding signal distortion or exceeding the range. The analog signal after filtering, amplification and level adjustment has a high signal-to-noise ratio and a suitable level range, thereby providing a high-quality input signal for subsequent analog-to-digital conversion and preliminary digital filtering, thereby improving the accuracy and reliability of the entire communication method.

[0114] In some preferred embodiments, in step S2, the preliminary digital filtering is mean filtering or low-pass filtering.

[0115] Specifically, in step S2, the analog feedback signal is filtered, amplified, and level-adjusted by a conditioning circuit, and then converted into a digital signal by an analog-to-digital converter. Subsequently, preliminary digital filtering is performed on the digital signal. If mean filtering is used, the average value of multiple consecutive sampling points is calculated as the filter output of the current point. If low-pass filtering is used, a digital low-pass filter is applied, which is designed to attenuate signal components above a preset cutoff frequency and retain signal components below the frequency. The filtered digitized analog feedback signal has a lower noise level. Thus, the signal is packaged and sent to the central control unit 114. After receiving the digitized analog feedback signal with reduced noise, the central control unit 114 performs data processing, control decision-making, or protection judgment. The reduction in signal noise makes the processing results of the central control unit 114 more accurate, thereby improving the performance of the control system and the reliability of the protection function.

[0116] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0117] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0118] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0119] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A power electronic switch electrical communication system, used in power electronic conversion equipment, characterized in that: The system comprises: An acquisition module is used to collect analog feedback signals and digital feedback signals of power electronic conversion equipment through a signal acquisition interface; The first processing module is used to perform conditioning, analog-to-digital conversion and preliminary digital filtering on the analog feedback signal to obtain a digitized analog feedback signal; a second processing module, configured to use a high-speed comparator to perform level determination on a protection signal requiring a rapid response in the digital feedback signal through a digital signal processing path to obtain a protection determination result, and, when the protection determination result meets a protection condition, generate a local shutdown signal through a local protection execution unit, wherein the local shutdown signal acts on a gate drive circuit of the power electronic conversion device to execute a local shutdown action; The step of performing level judgment on the protection signal requiring a quick response in the digital feedback signal using a high-speed comparator through a digital signal processing path to obtain a protection judgment result includes: digitally filtering the digital feedback signal using a digital signal processing path to obtain a filtered digital feedback signal, and determining an amplitude of the filtered digital feedback signal; Using the high-speed comparator to compare the amplitude of the protection signal that requires a quick response in the filtered digital feedback signal with a preset signal threshold to generate a comparison result, and using the anti-interference module to sample the comparison result multiple times. If the number of consecutive and consistent comparison results sampled by the anti-interference module reaches a preset number, the comparison result is determined to be valid, and the comparison result is output as the protection judgment result; The local protection execution unit has a shutdown timer; when the protection judgment result reaches the protection condition, the local protection execution unit generates a local shutdown signal, and the local shutdown signal acts on the gate drive circuit of the power electronic conversion device to perform the local shutdown action. The process includes: When the protection judgment result meets the protection condition, the protection judgment result is sent to the local protection execution unit, so that the local protection execution unit starts the shutdown timer for timing, and the shutdown timer is configured with a shutdown time threshold and a dead time parameter; During the timing of the shutdown timer, the local protection execution unit continuously outputs an enable signal to the shutdown control input terminal of the gate drive circuit, and interlocks the upper and lower bridge arm drive signals of the gate drive circuit according to the dead time parameter; When the shutdown timer reaches the shutdown time threshold, the local protection execution unit stops outputting the enable signal to the shutdown control input terminal of the gate drive circuit, releases the interlock control of the upper and lower bridge arm drive signals of the gate drive circuit, and completes the local shutdown action; The packaging module is used to package the digitized analog feedback signal and the protection judgment result into a data frame through the local communication interface unit, perform electrical isolation and differential signal conversion, and obtain a differential digital signal; The upload module is used to send the differential digital signal to the central control unit through an anti-interference digital communication link, so that the central control unit can perform one or more actions including data processing, control decision-making and protection judgment.

2. A power electronic switch electrical communication method, applied in a power electronic conversion device, characterized in that: The method comprises the following steps: S1. Collect analog feedback signals and digital feedback signals of power electronic conversion equipment through the signal acquisition interface; S2, conditioning, analog-to-digital conversion and preliminary digital filtering of the analog feedback signal to obtain a digitized analog feedback signal; S3. Using a high-speed comparator through a digital signal processing path, a level determination is performed on a protection signal requiring a rapid response in the digital feedback signal to obtain a protection determination result. When the protection determination result meets a protection condition, a local protection execution unit generates a local shutdown signal. The local shutdown signal acts on a gate drive circuit of the power electronic conversion device to perform a local shutdown action. The step of performing level judgment on the protection signal requiring a quick response in the digital feedback signal using a high-speed comparator through a digital signal processing path to obtain a protection judgment result includes: S31. Digitally filter the digital feedback signal using a digital signal processing path to obtain a filtered digital feedback signal, and determine the amplitude of the filtered digital feedback signal; S32. Using the high-speed comparator to compare the amplitude of the protection signal that requires a quick response in the filtered digital feedback signal with a preset signal threshold to generate a comparison result, and using the anti-interference module to sample the comparison result multiple times. If the number of consecutive and consistent comparison results sampled by the anti-interference module reaches a preset number, the comparison result is determined to be valid, and the comparison result is output as the protection judgment result. The local protection execution unit has a shutdown timer; when the protection judgment result reaches the protection condition, the local protection execution unit generates a local shutdown signal, and the local shutdown signal acts on the gate drive circuit of the power electronic conversion device to perform the local shutdown action. The process includes: B1. When the protection judgment result meets the protection condition, the protection judgment result is sent to the local protection execution unit, so that the local protection execution unit starts a shutdown timer for timing, and the shutdown timer is configured with a shutdown time threshold and a dead time parameter; B2. During the timing of the shutdown timer, the local protection execution unit continuously outputs an enable signal to the shutdown control input terminal of the gate drive circuit, and interlocks the upper and lower bridge arm drive signals of the gate drive circuit according to the dead time parameter; B3. When the shutdown timer reaches the shutdown time threshold, the local protection execution unit stops outputting the enable signal to the shutdown control input terminal of the gate drive circuit, releases the interlock control of the upper and lower bridge arm drive signals of the gate drive circuit, and completes the local shutdown action; S4. Through the local communication interface unit, the digitized analog feedback signal and the protection judgment result are packaged into a data frame, and electrical isolation and differential signal conversion are performed to obtain a differential digital signal; S5. Send the differential digital signal to the central control unit through the anti-interference digital communication link, so that the central control unit can perform one or more actions among data processing, control decision-making and protection judgment.

3. The power electronic switch electrical communication method according to claim 2, characterized in that: In step S31, the digital signal processing path includes an adaptive filter, and the adaptive filter includes: A noise estimation module, used for estimating the noise power spectrum density of the digital feedback signal in real time; A filter parameter adjustment module, configured to calculate and adjust the filter coefficients of the filter module according to the noise power spectrum density; The filtering module is used to perform digital filtering on the digital feedback signal.

4. The power electronic switch electrical communication method according to claim 3, characterized in that: The process of calculating and adjusting the filter coefficient of the filtering module according to the noise power spectrum density includes: A1. Inputting the noise power spectrum density into an adaptive step size factor calculation module, so as to calculate a normalized noise power based on the noise power spectrum density by the adaptive step size factor calculation module; A2. Calculating an adaptive step size factor using a nonlinear function according to the normalized noise power; A3. Adopting an adaptive step size factor and using a minimum mean square error algorithm, the filter coefficients are updated and adjusted.

5. The power electronic switch electrical communication method according to claim 4, characterized in that: In step S31, the process of determining the amplitude of the filtered digital feedback signal includes: The filtered digital feedback signal is obtained, and a root mean square value of the filtered digital feedback signal is calculated as the amplitude of the filtered digital feedback signal.

6. The power electronic switch electrical communication method according to claim 2, characterized in that: Step S4 includes: S41. Construct a data frame, where the data frame includes a frame header, a data payload, and a frame trailer, where the data payload includes a digitized analog feedback signal and a protection judgment result; S42. Calculate the CRC check code of the data payload according to a preset CRC check algorithm, and add the CRC check code to the end of the data frame to obtain a data frame including the CRC check code; S43, electrically isolating the data frame containing the CRC checksum through an isolation chip to obtain an isolated data frame; S44 , performing differential signal conversion on the isolated data frame through a differential signal driver to obtain a differential digital signal.

7. The power electronic switch electrical communication method according to claim 2, characterized in that: In step S2 , the conditioning process includes filtering, amplification, and level adjustment performed by a signal conditioning circuit.

8. The power electronic switch electrical communication method according to claim 2, characterized in that: In step S2, the preliminary digital filtering is mean filtering or low-pass filtering.

Images