Full-parameter automatic test system suitable for dual three-channel RD converter

Abstract

The invention discloses a full-parameter automatic test system suitable for a dual three-channel RD converter. The system sets and controls a tested product and a test instrument through computer control software, and realizes automatic test of performance parameters and functions of the to-be-tested dual three-channel RD converter under different temperature conditions according to a full-parameter automatic test process set by the computer control software. And automatically recording the test data and storing the test data to form a test record table. According to the invention, the test efficiency and test coverage of the dual three-channel RD converter can be effectively improved, and the actual result shows that a single converter can complete the test of all parameters within 5 minutes and automatically form a test record. Compared with a traditional manual test, the method has better efficiency and consistency, and is suitable for batch production test of the dual three-channel RD converter.

Description

Technical Field

[0001] This invention belongs to the field of automatic testing technology for RD converter parameters, and in particular, it is a full-parameter automatic testing system suitable for dual three-channel RD converters. Background Technology

[0002] In modern industrial automation, power system monitoring, and high-precision testing and measurement, the demand for multi-channel, synchronous, and high-precision signal acquisition is becoming increasingly urgent. This is especially true in complex power electronic devices such as motor drives, multiphase inverters, and grid-connected converters, where real-time and accurate monitoring of multiphase currents and voltages is required for precise control, protection, and status analysis. In this context, dual three-channel RD converters have emerged as key components for addressing these core challenges.

[0003] To ensure product quality, dual three-channel RD converters need to undergo parameter and functional testing before leaving the factory to check for compliance. However, currently, testing is mainly conducted manually using instruments to determine product quality. As the batch production quantity increases or the number of test parameters per unit increases, manual testing becomes inefficient. Therefore, there is an urgent need for a fully automated testing system to improve testing efficiency and consistency. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a fully automated testing system for dual three-channel RD converters.

[0005] The technical solution to achieve the purpose of this invention is: a fully automatic test system for dual-three-channel RD converters. The system uses computer control software to set and control the product under test and the test instruments, and according to the fully automatic test process set by the computer control software, it realizes the automatic testing of the performance parameters and functions of the dual-three-channel RD converter under test under different temperature conditions, as well as the automatic recording of test data and saving the test data to form a test record table; the computer control software is customized according to the test methods, instrument settings and control methods of each parameter.

[0006] Furthermore, the hardware component of the system includes:

[0007] The power supply unit is used to provide the required voltage to various parts of the system;

[0008] The signal acquisition unit is used to acquire signals related to the parameters of the dual three-channel RD converter;

[0009] Test fixtures are used to assemble dual-to-three-channel RD converters under test;

[0010] The temperature control unit is used to control the temperature of the dual three-channel RD converter under test;

[0011] The signal generation unit is used to generate the signals required for parameter testing and send them to the test fixture.

[0012] The control unit is used to control the operation of the entire testing system, to start or stop the full-parameter automatic test; it is also used to receive signals transmitted by the signal acquisition unit, perform data analysis and processing to obtain parameter test results.

[0013] Furthermore, the signal acquisition unit includes at least a data acquisition unit, a digital multimeter, and an oscilloscope, wherein the data acquisition unit is used to acquire angle data of the dual three-channel RD converter under test; the test fixture includes at least a fixture plate; the temperature control unit includes at least a heat flow meter; and the signal generation unit includes at least a resolver signal simulator for generating a calibrated resolver signal for the test fixture.

[0014] Furthermore, the control unit includes at least a computer and a control box. The computer is used to send control commands related to parameter testing to the control box, and is also used to receive signals transmitted by the signal acquisition unit, perform data analysis and processing to obtain parameter test results. The control box is used to receive control commands sent by the computer to control the test fixture to switch the connection between the dual three-channel RD converter under test and different signal acquisition channels in the signal acquisition unit, so as to realize the testing of different parameters of the dual three-channel RD converter under test.

[0015] Furthermore, the system implements reference voltage range testing for the dual three-channel RD converter, the specific process of which includes:

[0016] When the computer control software controls the resolver signal simulator to output the upper and lower reference voltages, the accuracy of the dual three-channel RD converter is read, and it is determined whether the reference voltage range that the dual three-channel RD converter can withstand meets the requirements, and the determination result is recorded.

[0017] Furthermore, the system implements reference frequency range testing for the dual three-channel RD converter, the specific process of which includes:

[0018] When controlling the upper and lower reference frequencies of the resolver signal simulator output by the computer control software, read the accuracy of the dual three-channel RD converter, determine whether the reference frequency range that the dual three-channel RD converter can withstand meets the requirements, and record the determination result.

[0019] Furthermore, the system implements maximum tracking rate testing for the dual three-channel RD converter, the specific process of which includes:

[0020] The computer control software controls the resolver signal simulator to output an angle at a certain speed. The duty cycle of the highest bit output waveform of the dual three-channel RD converter is detected by an oscilloscope to determine whether it is within the normal range, and the judgment result is recorded.

[0021] Furthermore, the system implements speed signal linearity testing for dual three-channel RD converters, the specific process of which includes:

[0022] The computer control software controls the resolver signal simulator to output angles at various speeds. There is a linear proportional relationship between each speed. By reading the DC value of the speed voltage measured by a digital multimeter under different speed conditions, the linear ratio between speed voltages and the error of the linear ratio between set speeds, as well as the symmetry of forward and reverse speed voltages, are calculated to obtain the linearity of the speed signal, determine whether it is within the normal range, and record the judgment result.

[0023] Furthermore, the formula for calculating the linearity of the forward speed voltage output of the dual three-channel RD converter under test is as follows:

[0024]

[0025] in,

[0026]

[0027]

[0028] In the formula, To determine the forward speed voltage output linearity of the dual three-channel RD converter under test, This represents the positive slope of the velocity voltage obtained from the test at point i. , where n represents the total number of test points. This represents the average value of the positive slope of the velocity voltage. , These represent the speed voltage measured at point i+1 and point i of the dual three-channel RD converter under test by the multimeter, respectively. This indicates the speed corresponding to the test at point i+1; This represents the speed corresponding to the test at point i;

[0029] The formula for calculating the inverting speed voltage output linearity of the dual three-channel RD converter under test is as follows:

[0030]

[0031] in,

[0032]

[0033]

[0034] In the formula, To determine the inverting speed voltage output linearity of the dual three-channel RD converter under test, This represents the slope of the reverse velocity voltage obtained from the test at point j. , where n represents the total number of test points. This represents the average value of the reverse slope of the velocity voltage. , These represent the speed voltage measured at point j+1 and point j of the dual three-channel RD converter under test by the multimeter, respectively. This indicates the speed corresponding to the (j+1)th test point; This indicates the speed corresponding to the test at point j.

[0035] Furthermore, the formula for calculating the voltage symmetry of forward and reverse rotation speeds is as follows:

[0036]

[0037] In the formula, Represents symmetry, expressed in %. This represents the average value of the positive slope of the velocity voltage. This represents the average value of the reverse slope of the velocity voltage.

[0038] Compared with the prior art, the significant advantages of this invention are:

[0039] (1) Currently, there is no system for automated testing of dual-to-three-channel RD converters. The testing of dual-to-three-channel RD converters is still mainly carried out by setting up a manual test platform with multiple devices. This invention can effectively improve the testing efficiency of dual-to-three-channel RD converters, reducing the testing time of the traditional testing method from 15 minutes to 5 minutes, and automatically generating test records. At the same time, the test coverage is more comprehensive, covering all technical parameters of dual-to-three-channel RD converters.

[0040] (2) Compared with traditional manual testing, the present invention has better efficiency and consistency and is suitable for mass production testing of dual three-channel RD converters.

[0041] (3) Optimized test methods and implementation processes are proposed for dynamic test items, including maximum tracking rate, speed voltage, speed signal linearity, and settling time, which makes it easier to implement an automatic test system.

[0042] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0043] Figure 1 This is a block diagram of a fully automated test system for the full parameters of a dual three-channel RD converter in one embodiment.

[0044] Figure 2 This is an automated testing flowchart in one embodiment.

[0045] Figure 3 This is a flowchart of the conversion accuracy test in one embodiment.

[0046] Figure 4 This is a flowchart of a resolution test in one embodiment.

[0047] Figure 5 This is a flowchart of the maximum tracking rate test in one embodiment.

[0048] Figure 6 This is a flowchart of a speed-voltage test in one embodiment.

[0049] Figure 7 This is a flowchart of a speed signal linearity test in one embodiment.

[0050] Figure 8 This is a flowchart of a stability time test in one embodiment. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0053] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0054] In one embodiment, a fully automated testing system for dual-three-channel RD converters is provided. The system uses computer control software to set and control the product under test and the testing instruments. Following the fully automated testing process set by the computer control software, the system automatically tests the performance parameters and functions of the dual-three-channel RD converter under test under different temperature conditions, automatically records the test data, and saves the test data to form a test record table. The computer control software is customized according to the test methods for each parameter, the instrument settings, and the control methods.

[0055] Furthermore, combined Figure 1 The hardware component of the system includes:

[0056] The power supply unit is used to provide the required voltage to various parts of the system;

[0057] The signal acquisition unit is used to acquire signals related to the parameters of the dual three-channel RD converter;

[0058] Test fixtures are used to assemble dual-to-three-channel RD converters under test;

[0059] The temperature control unit is used to control the temperature of the dual three-channel RD converter under test;

[0060] The signal generation unit is used to generate the signals required for parameter testing and send them to the test fixture.

[0061] The control unit is used to control the operation of the entire testing system, to start or stop the full-parameter automatic test; it is also used to receive signals transmitted by the signal acquisition unit, perform data analysis and processing to obtain parameter test results.

[0062] Preferably, in some embodiments, the signal acquisition unit includes at least a data acquisition unit, a digital multimeter, and an oscilloscope, wherein the data acquisition unit is used to acquire angle data of the dual three-channel RD converter under test; the test fixture includes at least a fixture plate; the temperature control unit includes at least a heat flow meter; the signal generation unit includes at least a resolver signal simulator for generating a calibrated resolver signal for the test fixture; and the power supply unit includes at least a range power supply.

[0063] Here, the fixture plate needs to be designed to be compatible with different models of dual-triple-channel RD converters.

[0064] Preferably, in some embodiments, the control unit includes at least a computer and a control box. The computer is used to send control commands related to parameter testing to the control box, and is also used to receive signals transmitted by the signal acquisition unit and perform data analysis and processing to obtain parameter test results. The control box is used to receive control commands sent by the computer to control the test fixture to switch the connection between the dual three-channel RD converter under test and different signal acquisition channels in the signal acquisition unit, so as to realize the testing of different parameters of the dual three-channel RD converter under test.

[0065] The overall testing process is as follows: Figure 2 As shown. After opening the automatic testing software, the testing system will perform a self-check to confirm that communication with each testing instrument has been established. First, click the login button on the testing software interface, fill in the tester information and product batch number, then click the channel selection button to select the channel to be tested, then click the test item button to select the test item, and finally click the test start button. The system will then begin testing the product. After the test is completed, the testing software will automatically generate a test report and save it in Excel format.

[0066] Furthermore, in one embodiment, the system implements conversion accuracy testing: Computer control software controls the power supply to the fixture plate and simultaneously controls the resolver signal simulator to output reference and signal. During conversion accuracy testing, the simulator is set to output different angular position signals. The data acquisition unit collects and reads the digital position data output by the converter, performs data calculation and error judgment, and then transmits the judgment result back to the computer control software. The specific process is as follows: Figure 3 As shown.

[0067] Here, the resolver signal simulator can be either the 5330A or the SMNQ-3 simulator; no specific limitation is made. Both devices provide an RS232 serial port for control. For different functions, a device selection function is designed in the computer control software to call different control functions.

[0068] Furthermore, in one embodiment, the system implements resolution testing: computer control software controls a resolver signal simulator to output an angle at a certain rotational speed (6 rpm), and the control box controls a relay on the fixture board to activate the converter's digital output pin D. n Switch to connection with the I / O board, where n is the converter's resolution, and the control software detects D. n To determine if the resolution meets the requirements, check for changes in the voltage level. The specific process is as follows: Figure 4 As shown.

[0069] Furthermore, in one embodiment, the system implements impedance testing: the computer control software transmits control commands to the control box, the control box controls the relays on the fixture board to connect the converter reference input pin and signal input pin to the multimeter, the computer control software sends setting instructions to the digital multimeter to switch the multimeter to the point resistance setting, reads the resistance value read by the multimeter, the control software determines whether the requirements are met, and records the determination result.

[0070] Furthermore, in one embodiment, the system implements digital level testing: the computer control software transmits control commands to the control box, the control box controls the relays on the fixture board to switch the converter's digital pins to connect with the I / O board, the computer control software reads the level fed back from the I / O board, determines whether the requirements are met, and records the determination result.

[0071] Furthermore, in one embodiment, the system implements a maximum tracking rate test: the computer control software controls the resolver signal simulator to output an angle at a specified maximum speed, and the control box controls the relay on the fixture board to connect the highest bit pin D1 of the converter's digital output to the oscilloscope. By reading the oscilloscope waveform, the duty cycle should be within 45% to 55% (judgment value), and it is determined whether the converter's maximum tracking rate meets the requirements. The judgment result is recorded. The specific process is as follows: Figure 5 As shown.

[0072] Further, in one embodiment, the system implements speed voltage testing: the instruments required for speed voltage testing include a resolver signal simulator and a digital multimeter. The multimeter is used to measure the speed voltage and transmit the measured value to the computer. The multimeter has a serial 232 communication port, so communication between the multimeter and the computer uses serial 232 communication. Before reading the measured value, a setting command needs to be sent to the multimeter to switch it to the DC voltage range. The command for measuring DC voltage is: VDC\n. Before reading the zero-point voltage of the speed signal, the multimeter needs to be switched to the AC voltage range. The command for measuring AC voltage is: VAC\n. The timing sequence of this test is as follows: set the simulator to rotate forward, read the speed voltage; set the simulator to rotate in reverse, read the speed voltage; read the signal voltage in a stationary state; determine whether the read value is within the given index range; and output the test result. The specific implementation process is as follows: Figure 6 As shown.

[0073] Furthermore, in one embodiment, the system implements a speed signal linearity test: computer software controls a simulator at 0 ( ) ~ Positive maximum tracking rate St ( Select speed T within the range i Speed ​​output, including at least 0 ( The maximum tracking rate St and the midpoint between them are measured. The control box controls the fixture board to connect the converter's speed signal pin to a multimeter, and the multimeter measures the converter's speed voltage V. i The linearity of the converter's forward speed voltage output is calculated using the following formula:

[0074]

[0075] in,

[0076]

[0077]

[0078] In the formula, To determine the forward speed voltage output linearity of the dual three-channel RD converter under test, This represents the positive slope of the velocity voltage obtained from the test at point i. , where n represents the total number of test points. This represents the average value of the positive slope of the velocity voltage. , These represent the speed voltage measured at point i+1 and point i of the dual three-channel RD converter under test by the multimeter, respectively. This indicates the speed corresponding to the test at point i+1; This represents the speed corresponding to the test at point i.

[0079] Then the computer software controls the simulator at 0 ( ) ~ negative maximum tracking rate St( Select speed T within the range j Speed ​​output, including at least 0 ( The control box controls the fixture board to connect the converter's speed signal pin to a multimeter, and measures the converter's speed voltage V using the multimeter. The maximum negative tracking rate St and the midpoint between them are also considered. j The linearity of the converter's reverse speed voltage output is calculated using the following formula:

[0080]

[0081] in,

[0082]

[0083]

[0084] In the formula, To determine the inverting speed voltage output linearity of the dual three-channel RD converter under test, This represents the slope of the reverse velocity voltage obtained from the test at point j. , where n represents the total number of test points. This represents the average value of the reverse slope of the velocity voltage. , These represent the speed voltage measured at point j+1 and point j of the dual three-channel RD converter under test by the multimeter, respectively. This indicates the speed corresponding to the (j+1)th test point; This indicates the speed corresponding to the test at point j.

[0085] Finally, the forward and reverse rotation speed voltage symmetry is calculated using the following formula:

[0086]

[0087] In the formula, Represents symmetry, expressed in %. This represents the average value of the positive slope of the velocity voltage. This represents the average value of the reverse slope of the velocity voltage.

[0088] The computer control software calculates and determines whether the linearity of the speed signal is within a given specification range, and outputs the test results. The specific implementation process is as follows: Figure 7 As shown.

[0089] Furthermore, in one embodiment, the system implements a steady-state test: computer software controls a simulator to output simulated angles in 179° step increments, and the control box controls a fixture plate to connect the converter's speed signal pin to an oscilloscope, measuring the time t required for the speed signal waveform to reach a steady state from its initial state. res The computer control software calculates and determines whether the steady-state time is within a given range, and outputs the test results. The specific implementation process is as follows: Figure 8 As shown.

[0090] This invention effectively improves the testing efficiency and coverage of dual-three-channel RD converters. Practical results show that a single converter can complete testing of all parameters and automatically generate test records within 5 minutes. Compared to traditional manual testing, this invention offers better efficiency and consistency, making it suitable for batch production testing of dual-three-channel RD converters.

[0091] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention without departing from its spirit and scope should be included within the protection scope of the present invention.

Claims

1. A fully automated testing system for all parameters of a dual-three-channel RD converter, characterized in that, The system uses computer control software to set and control the product under test and the testing instruments. Following the fully automated test process set by the computer control software, it realizes the automatic testing of the performance parameters and functions of the dual three-channel RD converter under test under different temperature conditions, as well as the automatic recording of test data and saving the test data to form a test record table. The computer control software is customized according to the test methods, instrument settings and control methods of each parameter.

2. The fully automated test system for dual-three-channel RD converters according to claim 1, characterized in that, The hardware component of the system includes: The power supply unit is used to provide the required voltage to various parts of the system; The signal acquisition unit is used to acquire signals related to the parameters of the dual three-channel RD converter; Test fixtures are used to assemble dual-to-three-channel RD converters under test; The temperature control unit is used to control the temperature of the dual three-channel RD converter under test; The signal generation unit is used to generate the signals required for parameter testing and send them to the test fixture. The control unit is used to control the operation of the entire testing system, to start or stop the full-parameter automatic test; it is also used to receive signals transmitted by the signal acquisition unit, perform data analysis and processing to obtain parameter test results.

3. The fully automated test system for dual-three-channel RD converters according to claim 2, characterized in that, The signal acquisition unit includes at least a data acquisition unit, a digital multimeter, and an oscilloscope, wherein the data acquisition unit is used to acquire angle data of the dual three-channel RD converter under test; the test fixture includes at least a fixture plate; the temperature control unit includes at least a heat flow meter; and the signal generation unit includes at least a resolver signal simulator for generating a calibrated resolver signal for the test fixture.

4. The fully automated test system for dual-three-channel RD converters according to claim 3, characterized in that, The control unit includes at least a computer and a control box. The computer is used to send control commands related to parameter testing to the control box, and is also used to receive signals transmitted by the signal acquisition unit, perform data analysis and processing to obtain parameter test results. The control box is used to receive control commands sent by the computer to control the test fixture to switch the connection between the dual three-channel RD converter under test and different signal acquisition channels in the signal acquisition unit, so as to realize the testing of different parameters of the dual three-channel RD converter under test.

5. The fully automated test system for dual-three-channel RD converters according to claim 4, characterized in that, The system enables the testing of the reference voltage range of a dual three-channel RD converter. The specific process includes: When the computer control software controls the resolver signal simulator to output the upper and lower reference voltages, the accuracy of the dual three-channel RD converter is read, and it is determined whether the reference voltage range that the dual three-channel RD converter can withstand meets the requirements, and the determination result is recorded.

6. The fully automated test system for dual-three-channel RD converters according to claim 4, characterized in that, The system implements reference frequency range testing for dual three-channel RD converters, and the specific process includes: When controlling the upper and lower reference frequencies of the resolver signal simulator output by the computer control software, read the accuracy of the dual three-channel RD converter, determine whether the reference frequency range that the dual three-channel RD converter can withstand meets the requirements, and record the determination result.

7. The fully automated test system for dual-three-channel RD converters according to claim 4, characterized in that, The system enables maximum tracking rate testing of dual three-channel RD converters, and the specific process includes: The computer control software controls the resolver signal simulator to output an angle at a certain speed. The duty cycle of the highest bit output waveform of the dual three-channel RD converter is detected by an oscilloscope to determine whether it is within the normal range, and the judgment result is recorded.

8. The fully automated test system for dual-three-channel RD converters according to claim 4, characterized in that, The system performs speed signal linearity testing on a dual three-channel RD converter. The specific process includes: The computer control software controls the resolver signal simulator to output angles at various speeds. There is a linear proportional relationship between each speed. By reading the DC value of the speed voltage measured by a digital multimeter under different speed conditions, the linear ratio between speed voltages and the error of the linear ratio between set speeds, as well as the symmetry of forward and reverse speed voltages, are calculated to obtain the linearity of the speed signal, determine whether it is within the normal range, and record the judgment result.

9. The fully automated test system for dual-three-channel RD converters according to claim 8, characterized in that, The formula for calculating the linearity of the forward speed voltage output of the dual three-channel RD converter under test is as follows: ； in, ； ； In the formula, To determine the forward speed voltage output linearity of the dual three-channel RD converter under test, This represents the positive slope of the velocity voltage obtained from the test at point i. , where n represents the total number of test points. This represents the average value of the positive slope of the velocity voltage. , These represent the speed voltage measured at point i+1 and point i of the dual three-channel RD converter under test by the multimeter, respectively. This indicates the speed corresponding to the test at point i+1; This represents the speed corresponding to the test at point i; The formula for calculating the inverting speed voltage output linearity of the dual three-channel RD converter under test is as follows: ； in, ； ； In the formula, To determine the inverting speed voltage output linearity of the dual three-channel RD converter under test, This represents the slope of the reverse velocity voltage obtained from the test at point j. , where n represents the total number of test points. This represents the average value of the reverse slope of the velocity voltage. , These represent the speed voltage measured at point j+1 and point j of the dual three-channel RD converter under test by the multimeter, respectively. This indicates the speed corresponding to the (j+1)th test point; This indicates the speed corresponding to the test at point j.

10. The fully automated test system for dual-three-channel RD converters according to claim 8, characterized in that, The formula for calculating the voltage symmetry of forward and reverse rotation speeds is: ； In the formula, Represents symmetry, expressed in %. This represents the average value of the positive slope of the velocity voltage. This represents the average value of the reverse slope of the velocity voltage.

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