Frequency converter measuring device and method

Abstract

The invention discloses a frequency converter measurement device and method, relates to the technical field of measurement and control, and provides a standardized measurement environment by integrating an interface relay protection card, an electric signal adjustment card, a signal acquisition card, an electronic load card and a main control module in a protection shell. The whole process of frequency converter access, load characteristic simulation, voltage and current signal adjustment and voltage signal acquisition is realized, the automation degree of measurement is improved, and the complexity of measurement is effectively reduced. And an image acquisition module arranged outside the protective shell can be combined to identify an indication signal of a display panel of the frequency converter in the testing process, and on the basis, the main control module can be combined with two paths of acquired voltage signals to obtain a measurement result of the frequency converter. The measurement efficiency is further improved, and the measurement result is automatically generated and read.

Description

Technical Field

[0001] This application relates to the field of measurement and control technology, and in particular to a frequency converter measurement device and method. Background Technology

[0002] A frequency converter is a power supply with a controllable and variable frequency output, widely used to regulate the operating speed of AC motors. By changing the frequency of the output power supply, it controls the motor speed, improving energy efficiency and achieving precise speed control. During the research and development and production of frequency converters, their functions and performance need to be measured. However, current measurement work mainly relies on manual methods, requiring the operation of numerous devices, involving complex procedures, and resulting in low testing efficiency, which can no longer meet production requirements. Summary of the Invention

[0003] In view of the above problems, this application provides a frequency converter measurement device and method to improve testing efficiency. The specific solution is as follows:

[0004] The first aspect of this application provides a frequency converter measuring device, comprising: a protective housing, an interface relay protection card, an electrical signal adjustment card, a signal acquisition card, an electronic load card and a main control module disposed inside the protective housing, and an image acquisition module disposed outside the protective housing;

[0005] The interface relay protection card is equipped with a signal interface for connecting to the frequency converter;

[0006] The electrical signal adjustment card is used to convert the target voltage signal and the target current signal into two voltage signals, wherein the target voltage signal and the target current signal are respectively the voltage signal and current signal of the frequency converter input from the interface relay protection card;

[0007] The electronic load card is connected between the electrical signal adjustment card and the interface relay protection card, and the electronic load card is used to simulate the load characteristics of the motor.

[0008] The signal acquisition card is used to acquire the two voltage signals respectively and send the acquired signals to the main control module;

[0009] The image acquisition module is used to acquire images of the display panel of the frequency converter;

[0010] The main control module is used to generate measurement results based on the images acquired by the image acquisition module and the two voltage signals, and is also used to select the switch of the interface relay protection card and the load characteristics of the electronic load card.

[0011] In one possible implementation, the interface relay protection card includes: a signal isolation submodule, an instruction parsing submodule, and a relay submodule;

[0012] The signal isolation submodule is used to couple the control signals sent by the main control module and then send them to the instruction parsing submodule;

[0013] The instruction parsing submodule is used to parse the control signal to obtain the level signal for controlling the relay;

[0014] The relay submodule is used to control the relay to turn on and off according to the level signal.

[0015] In one possible implementation, the electrical signal adjustment card includes a current adjustment submodule and a voltage adjustment submodule, with the electronic load card connected between the current adjustment submodule and the interface relay protection card;

[0016] The voltage adjustment submodule is used to convert the voltage of the frequency converter and output a voltage signal.

[0017] The current adjustment submodule is used to convert the current of the frequency converter when the load is applied to obtain another voltage signal.

[0018] In one possible implementation, the voltage regulation submodule includes a voltage amplification unit and a voltage isolation unit. The voltage amplification unit is used to amplify the voltage of the frequency converter, and the voltage isolation unit is used to isolate the amplified voltage and output the voltage signal.

[0019] In one possible implementation, the voltage regulation submodule further includes: a first power supply module and a second power supply module;

[0020] After isolating the supply voltage, the first power supply module supplies power to the voltage amplification unit and the isolation pre-stage of the voltage isolation unit;

[0021] After isolating the power supply voltage, the second power supply module supplies power to the isolation stage of the voltage isolation unit.

[0022] In one possible implementation, the image acquisition module includes: a camera and a support rod;

[0023] One end of the support rod is rotatably connected to the protective housing, and the camera is mounted on one end of the support rod. The inside of the support rod is a hollow structure, and the camera is connected to the main control module through a signal line arranged in the hollow structure.

[0024] In one possible implementation, the support rod is a telescopic structure consisting of at least two sub-mechanisms, the length of which is adjustable in a target direction, which is perpendicular to the rotation direction of the support rod.

[0025] In one possible implementation, the image acquisition module further includes at least two limiting blocks disposed on the protective housing, the at least two limiting blocks defining the rotation range of the support rod, so that the support rod can move within the rotation range.

[0026] A second aspect of this application provides a frequency converter measurement method, applied in the main control module of the frequency converter measurement device described in the first aspect, comprising:

[0027] In response to the measurement start signal, a conduction signal is sent to the interface relay protection card and a load adjustment signal is sent to the electronic load card;

[0028] The image acquisition module acquires and processes the acquired image to obtain status data characterizing the operating status of the frequency converter.

[0029] The operating status of the frequency converter is verified based on the status data and the two voltage signals acquired by the signal acquisition card.

[0030] In one possible implementation, the step of performing recognition processing on the acquired image obtained by the image acquisition module to obtain status data characterizing the operating status of the frequency converter includes:

[0031] The acquired images are preprocessed to determine the image recognition region;

[0032] The image in the recognition area is subjected to recognition of text content and indicator light on / off status to obtain the status data.

[0033] A third aspect of this application provides a computer program product including computer-readable instructions that, when executed on an electronic device, cause the electronic device to implement the inverter measurement method of the second aspect or any implementation thereof.

[0034] The fourth aspect of this application provides a computer storage medium carrying one or more computer programs, which, when executed by an electronic device, enable the electronic device to implement the inverter measurement method of the second aspect or any implementation thereof.

[0035] By utilizing the aforementioned technical solution, the inverter measurement device provided in this application, through the integration of an interface relay protection card, an electrical signal adjustment card, a signal acquisition card, an electronic load card, and a main control module within the protective housing, provides a standardized measurement environment. This enables the entire process of inverter connection, load characteristic simulation, voltage and current signal adjustment, and voltage signal acquisition, thereby improving the automation level of the measurement and effectively reducing its complexity. Furthermore, it can be combined with an image acquisition module located outside the protective housing to identify the indicator signals on the inverter's display panel during the testing process. Based on this, the main control module can combine the acquired two voltage signals to obtain the measurement results of the inverter. This further improves measurement efficiency and enables automatic generation and reading of measurement results. Attached Figure Description

[0036] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0037] Figure 1 A structural diagram of a frequency converter measuring device provided in this application;

[0038] Figure 2 An internal connection diagram of a frequency converter measuring device provided in this application;

[0039] Figure 3 An internal connection diagram of another inverter measuring device provided in this application;

[0040] Figure 4 This is a partial circuit diagram of the interface relay protection card provided in this application;

[0041] Figure 5 Another part of the circuit diagram of the interface relay protection card provided in this application;

[0042] Figure 6 The circuit diagram of the voltage regulation submodule provided in this application;

[0043] Figure 7 The architecture diagram of the main control module provided in this application. Detailed Implementation

[0044] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0045] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0046] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0047] Variable frequency drives (VFDs) are widely used in various motor drive systems, improving energy efficiency and enabling precise speed control. They are widely applied in both industrial and civil sectors. Simultaneously, both industrial and civil sectors are increasingly focused on aging management and reliability analysis of critical process systems. This necessitates measuring VFDs during R&D, production, and testing. However, current VFD measurement requires manual operation with a combination of equipment such as loads, power supplies, and oscilloscopes. This method is cumbersome, complex, and increasingly unable to meet the production and testing needs of VFDs.

[0048] To address the aforementioned problems, this application provides a frequency converter measuring device. The frequency converter measuring device of this application embodiment will be described in detail below with reference to the accompanying drawings.

[0049] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the inverter measuring device provided in the embodiments of this application, such as... Figure 1 As shown in the figure, an inverter measuring device provided in this application includes: a protective housing 1, an interface relay protection card 2, an electrical signal adjustment card 3, a signal acquisition card 4, an electronic load card 6 and a main control module 5 disposed inside the protective housing 1, and an image acquisition module 7 disposed outside the protective housing 1;

[0050] The interface relay protection card 2 is equipped with a signal interface for connecting the frequency converter.

[0051] The electrical signal adjustment card 3 is used to convert the target voltage signal and the target current signal into two voltage signals. The target voltage signal and the target current signal are the voltage signal and current signal of the frequency converter input from the interface relay protection card, respectively.

[0052] The electronic load card 6 is connected between the electrical signal conditioning card and the interface relay protection card. The electronic load card is used to simulate the load characteristics of the motor.

[0053] Signal acquisition card 4 is used to acquire the two voltage signals separately and send the acquired signals to the main control module.

[0054] Image acquisition module 7 is used to acquire images from the inverter's display panel.

[0055] The main control module 5 is used to generate measurement results based on the images acquired by the image acquisition module and the two voltage signals. It is also used to select the switching of the interface relay protection card and the load characteristics of the electronic load card.

[0056] Specifically, refer to Figure 2 The connection relationship between the various components inside the protective housing 1 is shown. The protective housing 1 can be set as a cuboid shape, and the interface relay protection card 2, the electrical signal adjustment card 3, the signal acquisition card 4, the electronic load card 6, and the main control module 5 can be arranged in sequence inside it.

[0057] The protective housing 1 can be constructed using a 6U chassis. The 6U chassis employs a modular design, with independent control between the main board and each slot, facilitating hardware upgrades and offering strong expandability. The interface relay protection card is used to connect to the inverter under test. It features overvoltage and overcurrent relay protection functions, automatically disconnecting the inverter from the device upon triggering the protection action. The interface relay protection card can consist of a relay control card and a power relay.

[0058] The electrical signal conditioning card 3 can condition the voltage and current signals output by the frequency converter into standard signals of 1V-5V.

[0059] Signal acquisition card 4 can be set to acquire the converted standard voltage signal at a set rate, and then the main control module analyzes and uses it.

[0060] The electronic load card 6 can simulate a motor under the control of the main control module, providing resistive and inductive loads. The resistance and inductance values ​​are adjustable, and the electronic load card has an internal active cooling fan for cooling.

[0061] The image acquisition module 7 can collect data on the operation of the LED digital tubes and LED lights on the inverter's display panel and hand them over to the main control module for analysis of the inverter's operating status.

[0062] During actual inverter measurement, the tester only needs to connect the inverter to the interface relay protection card 2 and power it on for self-test. Rotate the image acquisition module 7 to the front of the inverter. Set the corresponding load on the electronic load card 6 and start the device to automatically measure the inverter. After the measurement is completed, the device will generate a test report. Turn off the inverter and the device to end the measurement.

[0063] As can be seen above, this inverter measurement device adopts an integrated design, integrating a programmable electronic load card, interface relay protection board, voltage and current conditioning board, signal acquisition card, main control module, and image processing module within a standard 6U chassis. This provides a standardized measurement environment and effectively improves testing efficiency. By combining the image processing module, the inverter's display output can be automatically read and recorded, and the inverter's measurements can be verified using the voltage signal from the signal acquisition card, further improving testing efficiency.

[0064] In some embodiments, to improve the safety of measurement and effectively protect the frequency converter and measuring device, the interface relay protection card 2 includes: a signal isolation submodule, an instruction parsing submodule, and a relay submodule;

[0065] The signal isolation submodule is used to couple the control signals sent by the main control module to the instruction parsing submodule;

[0066] The instruction parsing submodule is used to parse control signals to obtain level signals for controlling relays;

[0067] The relay submodule is used to control the relay to turn on and off based on the level signal.

[0068] Specifically, refer to Figure 4 and Figure 5 As shown, the interface relay protection card 2 consists of a relay control card and a power relay. The relay control card comprises a signal isolation submodule and an instruction parsing submodule. The power relay is controlled by the relay control card. The circuit diagrams of the signal isolation submodule and the instruction parsing submodule are shown below. Figure 4 As shown, CON5 is the terminal for receiving the strobe signal ISOYNC, the clock signal ISOSCLK, and the data signal ISOSMOSI. DC2 provides isolated power to the B0505s. ISOYNC, ISOSCLK, and ISOSMOSI are connected to the I / O pins of U7 via optocouplers HCPL600 through U8, U9, and U10, respectively. U7 is a CPLD (Complex Programmable Logic Device) that parses control commands and generates the nCTRL signal. The nCTRL signal is used for control... Figure 5 The transistor Q11 shown controls the conduction or cutoff of its collector and emitter, thereby controlling the conduction or cutoff of the relay K11 coil. D11 is connected in parallel across the relay coil to protect it. Controlling the conduction and cutoff of SOUT0+ and SIN0+, and SOUT0- and SIN0-, further controls the conduction and cutoff of the high-power relay.

[0069] It is understood that those skilled in the art can select and adjust the models of the devices involved in the above circuit diagram as needed, and no restrictions are imposed here.

[0070] The electrical signal conditioning card 3 includes a current conditioning submodule and a voltage conditioning submodule, and an electronic load card is connected between the current conditioning submodule and the interface relay protection card.

[0071] The voltage regulation submodule is used to convert the voltage of the frequency converter and output a voltage signal.

[0072] The current adjustment submodule is used to convert the current of the frequency converter when the load is applied to obtain another voltage signal.

[0073] Specifically, refer to Figure 3 As shown, since the resistive and inductive loads in the electronic load card 6 will have a significant impact on the current, the current adjustment submodule can be used to collect the current.

[0074] The voltage regulation submodule includes a voltage amplification unit and a voltage isolation unit. The voltage amplification unit amplifies the voltage of the frequency converter, and the voltage isolation unit isolates the amplified voltage and outputs a voltage signal.

[0075] The voltage regulation submodule also includes: a first power supply module and a second power supply module;

[0076] After isolating the supply voltage, the first power supply module supplies power to the voltage amplification unit and the isolation pre-stage of the voltage isolation unit;

[0077] The second power supply module isolates the power supply voltage and then supplies power to the isolation stage of the voltage isolation unit.

[0078] Specifically, voltage and current conditioning are implemented using different circuits. (Refer to...) Figure 6 The circuit diagram for voltage conditioning is provided. VIN_01 is the voltage signal to be conditioned, which is first divided by resistors R1 and R2. INA128 is a high-precision, low-power general-purpose instrumentation amplifier with high common-mode interference suppression and high input impedance. The second stage uses an isolation operational amplifier ISO12 to isolate the voltage, resulting in the conditioned and isolated output VOUT_01. The power supply is divided into two parts: one is an isolation voltage (VDD1 and VSS1) formed by Vcc through an A2412D-1W, which shares a common ground with VIN_01 and powers the INA128 and the ISO124 isolation pre-stage. The other is an isolation voltage (VDD, VSS, and AGND) formed by Vcc through a WRA2412YMD-6W, which powers the ISO124 isolation post-stage. This effectively reduces interference signals in the acquisition circuit and ensures the accuracy of the acquired signal.

[0079] Furthermore, the current adjustment circuit can also adopt a design method similar to that of the voltage adjustment circuit described above to condition the current signal. Those skilled in the art can design and select according to their needs, and will not elaborate further here.

[0080] In other embodiments of this application, reference is made to Figure 1 As shown, the image acquisition module includes: a camera 71, a support rod 72, and at least two limiting blocks 74 disposed on the protective housing.

[0081] One end of the support rod 72 is rotatably connected to the protective housing 1. A camera 71 is installed at one end of the support rod 72. The inside of the support rod 72 is a hollow structure. The camera 71 is connected to the main control module through a signal line arranged in the hollow structure.

[0082] The support rod 72 is a telescopic structure consisting of at least two sub-mechanisms. The length of the telescopic structure is adjustable in the target direction, which is perpendicular to the rotation direction of the support rod 72.

[0083] At least two limiting blocks 74 define the rotation range of the support rod 72, allowing the support rod 72 to move within the rotation range.

[0084] Specifically, refer to Figure 1 As shown, one end of the support rod 72 can be fixed to the upper part of the protective housing 1 by the rotating fixing device 73, and the other end is equipped with a camera 71. The support rod 72 can rotate within a range of 0-180 degrees. After rotating into position, the support rod can be fixed by tightening the rotating fixing device 73. The support rod can adopt a two-section telescopic design, which can be extended and retracted for storage, and the extension length can be adjusted as needed during use. The power supply and signal lines are routed through the central control structure of the support rod, improving the neatness and aesthetics of the appearance. The two limit blocks at the top limit the rotation range of the camera mechanism and prevent excessive pulling of the internal cables.

[0085] It is understood that those skilled in the art can adjust the number of the aforementioned limiting blocks and the structure of the support rods as needed, and no restrictions are imposed here.

[0086] The embodiments of this application also provide a frequency converter measurement method, which can be applied to the main control module of the frequency converter measurement device described in the above embodiments, and specifically may include the following processing steps:

[0087] Step 101: In response to the measurement start signal, send a conduction signal to the interface relay protection card and a load adjustment signal to the electronic load card.

[0088] Step 102: The image acquired by the image acquisition module is processed to obtain status data representing the operating status of the frequency converter.

[0089] Step 103: Verify the operating status of the frequency converter based on the status data and the two voltage signals acquired by the signal acquisition card.

[0090] Specifically, after the frequency converter is connected to the frequency converter measuring device, the main control module, upon receiving the command to start measurement, sets the parameters of the electronic load card according to the impedance and inductive reactance parameters set by the user. Then, the control interface relay protection card is activated to perform the measurement. The measurement results are generated based on the image acquired by the image acquisition module and the voltage signal acquired by the signal acquisition card.

[0091] For example, the current voltage and current of the frequency converter are determined based on the collected standard voltage signal, and then combined with the voltage and current displayed on the frequency converter's display panel identified from the collected image, the normal operation status of the frequency converter is verified.

[0092] In some embodiments, the image acquired by the image acquisition module is processed for recognition to obtain status data characterizing the operating status of the frequency converter, which may specifically include:

[0093] Step 1021: Preprocess the acquired image to determine the image recognition area;

[0094] Step 1022: Recognize the text content and indicator light status of the image in the recognition area to obtain status data.

[0095] Specifically, the acquired images are processed by the image algorithm running in the main control module, which can identify the indicators of the inverter's LCD, LED digital tube and LED lights.

[0096] Image processing and recognition processes can specifically include the following steps:

[0097] The first part is image acquisition, which is accomplished by the camera and image acquisition module of the camera mechanism. It continuously captures images of the front panel of the frequency converter, using H.264 (AVC) video encoding format, and simultaneously records time stamps.

[0098] The second part is video extraction, which is completed by the main control and display modules. Based on the device's test command time and the video's time stamp, the corresponding valid video segments are extracted.

[0099] The third part is video preprocessing, which is completed by the main control and display modules. Images are extracted frame by frame from the valid video segments.

[0100] The fourth part involves image preprocessing, which is performed by the main control and display modules. This includes image resizing, noise removal, and edge extraction, ultimately identifying the key areas of the LCD, LED digital tube, and LED lights.

[0101] The fifth part involves OCR recognition of the extracted key areas, which is performed by the main control and display modules. This process identifies text information such as letters and numbers displayed on the LCD and LED digital tubes, and also recognizes the color and on / off information of the LED lights.

[0102] Part Six involves organizing the submitted information, a process completed by the main control and display modules. This includes generating recorded data and determining its validity.

[0103] The seventh part also includes a fault-tolerant mechanism that identifies images where key areas cannot be located, or where text information, light color, or on / off information cannot be accurately extracted, allowing for manual intervention for identification.

[0104] It is understood that those skilled in the art can implement the above image recognition process using different algorithms as needed, which will not be elaborated here.

[0105] The main control module provided in the embodiments of this application. (See reference...) Figure 7 The diagram illustrates a structural schematic suitable for implementing the main control module in the embodiments of this application. The electronic devices in the embodiments of this application may include, but are not limited to, fixed terminals such as PADs (tablet computers), desktop computers, etc. Figure 7 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0106] like Figure 7 As shown, the main control module may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 701, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 702 or a program loaded from a storage device 708 into a random access memory (RAM) 703. When the electronic device is powered on, the RAM 703 also stores various programs and data required for the operation of the electronic device. The processing device 701, ROM 702, and RAM 703 are interconnected via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0107] Typically, the following devices can be connected to I / O interface 705: input devices 706 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 707 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 708 including, for example, memory cards, hard drives, etc.; and communication devices 709. Communication device 709 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 7Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown. More or fewer devices may be implemented or have alternatively.

[0108] This application also provides a computer program product including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the inverter measurement methods provided in this application.

[0109] This application also provides a computer-readable storage medium carrying one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the inverter measurement methods provided in this application.

[0110] It should also be noted that the device embodiments described above are merely illustrative. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0111] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0112] In the above embodiments, the implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, in the form of a computer program product.

[0113] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

Claims

1. A frequency converter measuring device, characterized in that, include: The protective housing, the interface relay protection card, the electrical signal adjustment card, the signal acquisition card, the electronic load card and the main control module disposed inside the protective housing, and the image acquisition module disposed outside the protective housing; The interface relay protection card is equipped with a signal interface for connecting to the frequency converter; The electrical signal adjustment card is used to convert the target voltage signal and the target current signal into two voltage signals, wherein the target voltage signal and the target current signal are respectively the voltage signal and current signal of the frequency converter input from the interface relay protection card; The electronic load card is connected between the electrical signal adjustment card and the interface relay protection card, and the electronic load card is used to simulate the load characteristics of the motor. The signal acquisition card is used to acquire the two voltage signals respectively and send the acquired signals to the main control module; The image acquisition module is used to acquire images of the inverter's display panel; The main control module is used to generate measurement results based on the images acquired by the image acquisition module and the two voltage signals, and is also used to select the switch of the interface relay protection card and the load characteristics of the electronic load card.

2. The inverter measuring device according to claim 1, characterized in that, The interface relay protection card includes: a signal isolation submodule, an instruction parsing submodule, and a relay submodule; The signal isolation submodule is used to couple the control signals sent by the main control module and then send them to the instruction parsing submodule; The instruction parsing submodule is used to parse the control signal to obtain the level signal for controlling the relay; The relay submodule is used to control the relay to turn on and off according to the level signal.

3. The inverter measuring device according to claim 1, characterized in that, The electrical signal adjustment card includes a current adjustment submodule and a voltage adjustment submodule, and the electronic load card is connected between the current adjustment submodule and the interface relay protection card; The voltage adjustment submodule is used to convert the voltage of the frequency converter and output a voltage signal. The current adjustment submodule is used to convert the current of the frequency converter when the load is applied to obtain another voltage signal.

4. The frequency converter measuring device according to claim 3, characterized in that, The voltage adjustment submodule includes a voltage amplification unit and a voltage isolation unit. The voltage amplification unit is used to amplify the voltage of the frequency converter, and the voltage isolation unit is used to isolate the amplified voltage and output the voltage signal.

5. The inverter measuring device according to claim 4, characterized in that, The voltage regulation submodule further includes: a first power supply module and a second power supply module; After isolating the supply voltage, the first power supply module supplies power to the voltage amplification unit and the isolation pre-stage of the voltage isolation unit; After isolating the power supply voltage, the second power supply module supplies power to the isolation stage of the voltage isolation unit.

6. The inverter measuring device according to any one of claims 1 to 5, characterized in that, The image acquisition module includes: a camera and a support rod; One end of the support rod is rotatably connected to the protective housing, and the camera is mounted on one end of the support rod. The inside of the support rod is a hollow structure, and the camera is connected to the main control module through a signal line arranged in the hollow structure.

7. The inverter measuring device according to claim 6, characterized in that, The support rod is a telescopic structure consisting of at least two sub-mechanisms. The length of the telescopic structure is adjustable in the target direction, which is perpendicular to the rotation direction of the support rod.

8. The frequency converter measuring device according to claim 6, characterized in that, The image acquisition module further includes at least two limiting blocks disposed on the protective housing, the at least two limiting blocks defining the rotation range of the support rod, so that the support rod can move within the rotation range.

9. A method for measuring a frequency converter, applied in the main control module of the frequency converter measuring device according to any one of claims 1 to 8, characterized in that, include: In response to the measurement start signal, a conduction signal is sent to the interface relay protection card and a load adjustment signal is sent to the electronic load card; The image acquisition module acquires and processes the acquired image to obtain status data characterizing the operating status of the frequency converter. The operating status of the frequency converter is verified based on the status data and the two voltage signals acquired by the signal acquisition card.

10. The inverter measurement method according to claim 9, characterized in that, The step of processing the acquired images obtained by the image acquisition module to obtain status data characterizing the operating status of the frequency converter includes: The acquired images are preprocessed to determine the image recognition region; The image in the recognition area is subjected to recognition of text content and indicator light on / off status to obtain the status data.

Images