Electromagnetic voiceprint monitoring system and method for state of power electronic device

Abstract

The invention provides a power electronic device state electromagnetic voiceprint monitoring system and method, and relates to the technical field of power electronic device aging monitoring, and the system comprises an electromagnetic voiceprint collection device which comprises a resonant piezoelectric speed sensor, a voiceprint signal collection module, a self-energy-taking power supply module and a first wireless communication module; the system main control module comprises a second wireless communication module, a central processing unit, a voiceprint storage unit, a voiceprint display unit and an aging evaluation module, and the second wireless communication module is in communication connection with the first wireless communication module. With the adoption of the scheme, the early aging state in the device is monitored under the condition that the normal work of the power electronic device is not influenced; the monitoring system is low in invasiveness, higher in monitoring sensitivity and better in reliability.

Description

Technical Field

[0001] The present application relates to the technical field of aging monitoring of power electronic devices, and in particular to a system and method for monitoring the electromagnetic soundprint of a power electronic device. Background Art

[0002] Power electronic devices play an important role in the fields of new energy power generation, special equipment, rail transportation, etc., and are the key to realizing power conversion. Since power electronic devices often work in the on-off state, frequently subjected to high voltage and high current shocks, they are easily subjected to repeated effects of thermal stress and mechanical stress, which leads to fatigue damage, affecting the normal operation of the device and posing a serious threat to the safe and stable operation of the system. Therefore, the damage status monitoring and remaining life prediction of power electronic devices are of great significance.

[0003] The existing electrical parameter monitoring method for power electronic device damage status monitoring requires changing the working circuit of the power electronic device, which cannot achieve non-invasive monitoring and cannot detect early aging; the infrared thermal parameter monitoring method has high monitoring equipment costs and requires the removal of the device package; the monitoring method based on the aging model has problems of poor accuracy and low reliability due to the inability to accurately model aging. At present, there is no non-invasive, highly sensitive power electronic device status monitoring method that can monitor early aging defects. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first purpose of this application is to propose an electromagnetic soundprint monitoring system for the status of power electronic devices, which realizes the monitoring of the aging status of power electronic devices and provides technical support for the safe operation of new energy power generation, special equipment, rail transit, etc.

[0006] The second objective of the present application is to propose a method for monitoring the electromagnetic soundprint of a power electronic device.

[0007] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a power electronic device state electromagnetic soundprint monitoring system, including an electromagnetic soundprint collection device and a system main control module, wherein:

[0008] The electromagnetic soundprint collection device includes a resonant piezoelectric velocity sensor, a soundprint signal collection module, a self-power supply module and a first wireless communication module;

[0009] The system main control module includes a second wireless communication module, a central processing unit, a voiceprint storage unit, a voiceprint display unit and an aging evaluation module, wherein the second wireless communication module is communicatively connected with the first wireless communication module.

[0010] Optionally, in one embodiment of the present application, the electromagnetic soundprint collection device is arranged on the packaging shell or heat sink of the power electronic device, the resonant piezoelectric velocity sensor is coupled to the packaging shell or heat sink of the power electronic device through a clamp or adhesive, and the resonant piezoelectric velocity sensor is installed at a selected position closest to the semiconductor chip.

[0011] Optionally, in one embodiment of the present application, the resonant frequency of the resonant piezoelectric velocity sensor is 80kHz to 150kHz, and the peak sensitivity is not less than 65dB.

[0012] Optionally, in one embodiment of the present application, the voiceprint signal acquisition module includes a preamplifier, a filtering circuit and a data acquisition chip, the preamplifier is connected to the resonant piezoelectric velocity sensor, the sampling rate of the data acquisition chip is not less than 10MHz, and the time length of the extracted single-time electromagnetic voiceprint signal of the power electronic device on and off is greater than 150us.

[0013] Optionally, in one embodiment of the present application, the voiceprint signal acquisition module includes a preamplifier, a filtering circuit and a data acquisition chip, the preamplifier is connected to the resonant piezoelectric velocity sensor, the sampling rate of the data acquisition chip is not less than 10MHz, and the time length of the extracted single-time electromagnetic voiceprint signal of the power electronic device on and off is greater than 150us.

[0014] Optionally, in one embodiment of the present application, the power supply module includes a self-energy extraction coil and an energy storage capacitor. The self-energy extraction coil is installed on the collector pin of the power electronic device. The self-energy extraction coil obtains energy through the principle of electromagnetic induction, and the energy storage capacitor stores the energy obtained by the self-energy extraction coil.

[0015] Optionally, in one embodiment of the present application, the central processing unit receives the voiceprint information transmitted by the second wireless communication module, displays the waveform in the voiceprint display unit, and stores it in the voiceprint storage unit; the aging assessment module assesses the aging status of the power electronic device based on the data stored in the voiceprint storage unit; the central processing unit receives the assessment result of the aging assessment module and marks it in the voiceprint display unit.

[0016] To achieve the above purpose, a second embodiment of the present invention proposes a method for monitoring the electromagnetic soundprint of a power electronic device state, which is applied to the above-mentioned electromagnetic soundprint monitoring system for the power electronic device state. The method comprises:

[0017] The electromagnetic soundprint signal of the resonant piezoelectric speed sensor is collected when the power electronic device is turned on and off. When collecting, the interference data caused by the transient electromagnetic coupling noise in the space is eliminated through the preamplifier and filter circuit to obtain the electromagnetic soundprint signal;

[0018] Performing data enhancement on the collected electromagnetic soundprint signal to obtain the electromagnetic soundprint signal time series;

[0019] Calculate the electromagnetic soundprint energy time series and the electromagnetic soundprint cumulative energy time series based on the electromagnetic soundprint signal time series;

[0020] By comparing the accumulated energy time series of electromagnetic soundprints with the accumulated energy time series of historical electromagnetic soundprints and comparing them with the life fitting curve obtained from the power cycle accelerated aging test, the aging state and remaining life of power electronic devices can be evaluated in real time.

[0021] Optionally, in one embodiment of the present application, removing interference data caused by transient electromagnetic coupling noise in space through a preamplifier and a filter circuit includes:

[0022] The part of the signal frequency band greater than 1MHZ is determined as the noise of the transient electromagnetic coupling to the sensor during the switching on and off of the power electronic device.

[0023] Optionally, in one embodiment of the present application, the data enhancement method is cubic spline interpolation of voiceprint signals, subsequence feature enhancement based on voiceprint signal decomposition, or data repair based on the statistical law of historical voiceprints; the electromagnetic voiceprint cumulative energy time series is expressed as:

[0024]

[0025] Among them, S(t) is the electromagnetic soundprint cumulative energy time series, X(t) is the electromagnetic soundprint time series, and E(t) is the electromagnetic soundprint energy time series.

[0026] Optionally, in one embodiment of the present application, the life fitting curve obtained by the power cycle aging accelerated test includes: a group of electromagnetic sound print cumulative energy curves of the power electronic device from intact to failed, and a separation time point and power cycle number curve.

[0027] The electromagnetic soundprint monitoring method for the state of power electronic devices in the embodiment of the present application utilizes the electromagnetic soundprint signals of the power electronic devices when they are turned on and off to monitor their aging state; it can monitor and evaluate the aging state of the devices in real time and predict the remaining lifespan; the monitoring sensitivity is higher and the reliability is higher; the method has a simple model solution and good real-time performance; and the system power consumption is low.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1A schematic diagram of the structure of a power electronic device status electromagnetic soundprint monitoring system provided in Example 1 of the present application;

[0031] Figure 2 A schematic diagram of a flow chart of a method for monitoring electromagnetic sound patterns of a power electronic device state provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the time domain waveform of the electromagnetic soundprint signal of the power electronic device according to an embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the time series of the accumulated energy of the electromagnetic sound print of power electronic devices in different aging states according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] The following describes the electromagnetic acoustic print monitoring system and method for the state of power electronic devices according to an embodiment of the present application with reference to the accompanying drawings.

[0036] Figure 1 A schematic diagram of the structure of an electromagnetic soundprint monitoring system for the status of a power electronic device provided in Example 1 of the present application.

[0037] like Figure 1 As shown, the electromagnetic soundprint monitoring system for the power electronic device status includes an electromagnetic soundprint acquisition device and a system main control module, wherein:

[0038] The electromagnetic soundprint collection device includes a resonant piezoelectric velocity sensor, a soundprint signal collection module, a self-power supply module and a first wireless communication module;

[0039] In this embodiment, the electromagnetic soundprint collection device is arranged near the power electronic device packaging shell or the heat sink, and the resonant piezoelectric velocity sensor is coupled to the power electronic device packaging shell or the heat sink through a clamp or an adhesive.

[0040] In this embodiment, the resonant piezoelectric velocity sensor is installed at a selected position that is as close to the semiconductor chip as possible. When selecting, according to the structure of the power electronic device, a position close to the semiconductor chip is selected in the device housing or heat sink, so that the acoustic impedance of the solid medium on the propagation path of the voiceprint signal from the inside of the device to the sensor is as small as possible.

[0041] In this embodiment, the resonant frequency of the resonant piezoelectric velocity sensor is 80kHz to 150kHz, and the peak sensitivity is not less than 65dB.

[0042] In this embodiment, the preamplifier and the filter circuit are connected to the resonant piezoelectric speed sensor to filter out transient electromagnetic noise and other electromagnetic interference noise. The sampling rate of the data acquisition chip is not less than 10MHz, and the time length of the extracted single-time electromagnetic soundprint signal of the power electronic device on and off is greater than 150us.

[0043] In this embodiment, the power supply module is powered by a combination of a self-energy coil and an energy storage capacitor. The self-energy coil is installed on the collector pin of the power electronic device to obtain energy through the principle of electromagnetic induction; the energy storage capacitor is used to store the obtained energy and drive the electromagnetic soundprint collection device to complete a signal collection and wireless transmission.

[0044] Preferably, the data acquisition processor adopts the STM32F7 series high-performance single-chip microcomputer produced by STMicroelectronics; the electromagnetic soundprint monitoring sensor adopts a piezoelectric sensor with a resonant frequency of 150kHz and a peak sensitivity of 75dB.

[0045] The system main control module includes a second wireless communication module, a central processing unit, a voiceprint storage unit, a voiceprint display unit and an aging evaluation module, wherein the second wireless communication module is communicatively connected with the first wireless communication module.

[0046] In this embodiment, the central processor receives the voiceprint information transmitted by the wireless communication module, displays the waveform on the voiceprint display unit and stores it in the voiceprint storage unit. The central processor also receives the evaluation result of the aging evaluation module and marks it in the voiceprint display unit.

[0047] In this embodiment, the aging assessment module extracts historical voiceprint data from the voiceprint storage unit, performs feature extraction and timing feature analysis on the voiceprint signal, assesses the current aging state of the power electronic device, and predicts the device life.

[0048] Preferably, the wireless communication module adopts WiFi networking communication mode, and is used for mutual communication between multiple electromagnetic soundprint signal acquisition devices of the system and the system main control module.

[0049] The electromagnetic soundprint monitoring system for the state of power electronic devices in the embodiment of the present application utilizes the transient electromagnetic soundprint signals of the power electronic devices when they are turned on and off to monitor their aging state; it can monitor and evaluate the aging state of the devices in real time and predict the remaining lifespan, with higher monitoring sensitivity and reliability; the method for solving the model is simple and has good real-time performance; and the system has low power consumption.

[0050] In order to implement the above-mentioned embodiment, the present application also proposes a method for monitoring the electromagnetic soundprint of the state of a power electronic device, which is applied to the above-mentioned electromagnetic soundprint monitoring system of the state of a power electronic device.

[0051] Figure 2 A schematic flow chart of a method for monitoring the electromagnetic soundprint of a power electronic device state provided in an embodiment of the present application.

[0052] like Figure 2 As shown, the method for monitoring the electromagnetic soundprint of the power electronic device state includes the following steps:

[0053] Step 201, collecting electromagnetic soundprint signals of the power electronic device when the power electronic device is turned on or off, and the vibration direction is perpendicular to the resonant piezoelectric speed sensor. During the collection, the interference data caused by the transient electromagnetic coupling noise in the space is eliminated through the preamplifier and the filter circuit to obtain the electromagnetic soundprint signal;

[0054] In this embodiment, the preamplifier and the filter circuit eliminate the interference data caused by the transient electromagnetic coupling noise in the space, including: when the signal frequency band is greater than 1MHz, it is considered that the noise is coupled to the sensor by the transient electromagnetic effect of the power electronic device when it is turned on and off.

[0055] Step 202, performing data enhancement on the collected electromagnetic soundprint signal to obtain a time series of the electromagnetic soundprint signal;

[0056] In this embodiment, the signal quality is evaluated by the central processing unit, and data enhancement is performed to obtain the electromagnetic voiceprint signal time series. The data enhancement methods include but are not limited to: cubic spline interpolation of voiceprint signals, subsequence feature enhancement based on voiceprint signal decomposition, and data repair based on the statistical laws of historical voiceprints.

[0057] For example, the waveform of the collected electromagnetic soundprint signal is as follows: Figure 3 As shown, the filtering circuit uses low-pass filtering with a cutoff frequency of 1 MHz, and the cubic spline interpolation method is used for waveform repair. The final waveform length is 180 us and the sampling rate is 100 MHz.

[0058] Step 203, calculating the electromagnetic soundprint energy time series and the electromagnetic soundprint cumulative energy time series based on the electromagnetic soundprint signal time series;

[0059] In this embodiment, the electromagnetic soundprint energy time series E(t), the electromagnetic soundprint cumulative energy time series S(t) and the electromagnetic soundprint time series X(t) satisfy the following relationship:

[0060]

[0061] Step 204 , compare the electromagnetic soundprint cumulative energy time series with the historical electromagnetic soundprint cumulative energy time series, and compare it with the life fitting curve obtained by the power cycle accelerated aging test to evaluate the aging state and remaining life of the power electronic device in real time.

[0062] In this embodiment, the life fitting curve obtained by the power cycle accelerated aging test includes: a group of electromagnetic sound print cumulative energy curves of the power electronic device from intact to failure, and a separation time point and power cycle number curve.

[0063] In this embodiment, the cumulative energy time series of electromagnetic soundprints is compared with the cumulative energy time series of historical electromagnetic soundprints, the sequence separation time points and sequence maximum values ​​are analyzed, and the life fitting curve obtained by the power cycle accelerated aging test is compared to evaluate the aging state and remaining life of the power electronic device in real time.

[0064] For example, the electromagnetic soundprint cumulative energy time series is as follows Figure 4 As shown, the life fitting curve obtained from the power cycle accelerated aging test is used to evaluate the aging state of the device, and the evaluation results of no aging, slight aging, and moderate aging are obtained.

[0065] The electromagnetic soundprint monitoring method for the state of power electronic devices in the embodiment of the present application can utilize the electromagnetic soundprint signals emitted by the switching transients of the power electronic devices to monitor the aging state of the devices and evaluate the remaining life at the same time; the method has a simple solution model, fast judgment speed and good real-time performance.

[0066] It should be noted that the above explanation of the embodiment of the electromagnetic soundprint monitoring system for the state of power electronic devices is also applicable to the electromagnetic soundprint monitoring method for the state of power electronic devices of this embodiment, and will not be repeated here.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0070] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0071] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0072] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0073] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0074] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A power electronic device status electromagnetic soundprint monitoring system, characterized in that: It includes an electromagnetic voiceprint collection device and a system main control module, wherein: The electromagnetic soundprint collection device includes a resonant piezoelectric velocity sensor, a soundprint signal collection module, a self-power supply module and a first wireless communication module; The system main control module includes a second wireless communication module, a central processing unit, a voiceprint storage unit, a voiceprint display unit and an aging evaluation module, wherein the second wireless communication module is communicatively connected with the first wireless communication module.

2. The system according to claim 1, characterized in that The electromagnetic soundprint collection device is arranged on the power electronic device packaging shell or the heat sink, the resonant piezoelectric velocity sensor is coupled to the power electronic device packaging shell or the heat sink through a clamp or an adhesive, and the resonant piezoelectric velocity sensor is installed at a selected position closest to the semiconductor chip.

3. The system according to claim 1, characterized in that The resonant piezoelectric velocity sensor has a resonant frequency of 80kHz to 150kHz and a peak sensitivity of not less than 65dB.

4. The system according to claim 1, characterized in that The voiceprint signal acquisition module includes a preamplifier, a filter circuit and a data acquisition chip. The preamplifier is connected to the resonant piezoelectric velocity sensor. The sampling rate of the data acquisition chip is not less than 10MHz. The time length of the extracted single-time electromagnetic voiceprint signal of the power electronic device on and off is greater than 150us.

5. The system according to claim 1, wherein: The power supply module includes a self-energy extraction coil and an energy storage capacitor. The self-energy extraction coil is installed on the collector pin of the power electronic device. The self-energy extraction coil obtains energy through the principle of electromagnetic induction, and the energy storage capacitor stores the energy obtained by the self-energy extraction coil.

6. The system according to claim 1, wherein: The central processing unit receives the voiceprint information transmitted by the second wireless communication module, displays the waveform in the voiceprint display unit, and stores it in the voiceprint storage unit; the aging assessment module assesses the aging status of the power electronic device based on the data stored in the voiceprint storage unit; the central processing unit receives the assessment result of the aging assessment module and marks it in the voiceprint display unit.

7. A method for monitoring electromagnetic soundprint of power electronic device status, characterized in that: The method is applied to the electromagnetic acoustic print monitoring system for the state of a power electronic device according to any one of claims 1 to 6, and the method comprises: Collecting electromagnetic soundprint signals of the power electronic device when it is turned on or off in a transient state, with the vibration direction perpendicular to the resonant piezoelectric speed sensor, and during the collection, removing interference data caused by transient electromagnetic coupling noise in the space through the preamplifier and the filter circuit to obtain electromagnetic soundprint signals; Performing data enhancement on the collected electromagnetic soundprint signal to obtain the electromagnetic soundprint signal time series; Calculate the electromagnetic soundprint energy time series and the electromagnetic soundprint cumulative energy time series based on the electromagnetic soundprint signal time series; The aging state and remaining life of the power electronic device are evaluated in real time by comparing the electromagnetic soundprint cumulative energy time series with the historical electromagnetic soundprint cumulative energy time series and comparing with the life fitting curve obtained by the power cycle accelerated aging test.

8. The method according to claim 7, characterized in that The method of eliminating interference data caused by transient electromagnetic coupling noise in space by the preamplifier and the filter circuit includes: The part of the signal frequency band greater than 1MHZ is determined as the noise of the transient electromagnetic coupling to the sensor during the switching on and off of the power electronic device.

9. The method according to claim 7, characterized in that The data enhancement method is cubic spline interpolation of voiceprint signal, subsequence feature enhancement based on voiceprint signal decomposition, or data repair based on the statistical law of historical voiceprint; the electromagnetic voiceprint cumulative energy time series is expressed as: Among them, S(t) is the electromagnetic soundprint cumulative energy time series, X(t) is the electromagnetic soundprint time series, and E(t) is the electromagnetic soundprint energy time series.

10. The method according to claim 7, characterized in that The life fitting curve obtained by the power cycle aging accelerated test includes: a group of electromagnetic sound pattern cumulative energy curves of power electronic devices from intact to failure, and a separation time point and power cycle number curve.

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