1033 results about "Test power" patented technology

The invention discloses a method for testing the dynamic response characteristic of a power supply by simulating the load change of the power supply, and relates to the technical field of power supply testing, and the method comprises the steps: generating a simulation load change sequence based on a preset load change mode, and enabling each load value to correspond to a specific time point; inputting the simulated load change sequence into the power supply to be tested, and controlling the power supply to be tested to work according to the simulated load change sequence by using the multi-channel synchronous test system so as to simulate the load change in the actual use process; a high-precision data acquisition module is used for acquiring and recording output voltage values, output current values and corresponding timestamps of the to-be-tested power supply under different load conditions at a sampling rate not lower than a first set value, and a dynamic response data set is formed; and processing the dynamic response data set by using a preset data calibration algorithm, and calculating dynamic response parameters of the to-be-tested power supply at each load change point. The motor power supply testing device has the effect of improving motor power supply testing precision.

The invention provides a driving power supply testing method, device and equipment and a storage medium, and relates to the technical field of driving power supply testing, and the method comprises the steps: obtaining an input voltage, an input current, an output voltage and an output current of a to-be-tested driving power supply under different loads; according to the input voltage, the input current, the output voltage and the output current of the to-be-tested driving power supply under different loads, calculating the conversion efficiency of the to-be-tested driving power supply under different loads; according to the conversion efficiency of the to-be-tested driving power supply under different loads, determining stable parameters of the to-be-tested power supply; acquiring output voltage fluctuation ranges of the to-be-tested driving power supply under different loads, and determining precision parameters of the to-be-tested driving power supply according to the output voltage fluctuation ranges of the to-be-tested driving power supply under different loads; and determining the working performance grade of the to-be-tested driving power supply in combination with the stable parameters and the precision parameters. The technical effect of the invention is that the comprehensive performance of the driving power supply can be accurately evaluated.

The invention relates to the technical field of radio frequency modules, and discloses a radio frequency module power amplifier efficiency test method and system, and the method comprises the steps: connecting a signal generator, a power meter, a spectrum analyzer and a DC power supply with a to-be-tested power amplifier, and obtaining a layered power amplifier efficiency test system; establishing a continuous wave test model and a modulation signal test model to obtain compensation parameter data; inputting a first test signal to the to-be-tested power amplifier to obtain power gain data and standardized efficiency data; inputting a second test signal to the to-be-tested power amplifier to obtain adjacent channel leakage power ratio data; performing total efficiency analysis and isolation efficiency analysis on different working states to obtain a layering efficiency analysis result; and carrying out standardization processing on a hierarchical efficiency analysis result, establishing power measurement error evaluation and efficiency calculation error evaluation, and obtaining a power amplifier efficiency test report, thereby realizing comprehensive evaluation on the efficiency characteristics of the power amplifier in different working states.

The invention discloses an energy storage converter test power setting method and device, and relates to the field of converter testing, the energy storage converter test power setting method is applied to an energy storage converter test system, and the energy storage converter test system comprises a high-voltage power grid, a power isolation transformer, a first energy storage converter and a second energy storage converter; wherein the high-voltage power grid is electrically connected with one end of the power isolation transformer, and the first energy storage converter and the second energy storage converter are electrically connected with the other end of the power isolation transformer. Sending a first optical fiber signal to a second energy storage converter based on the target optical fiber transmission channel; and indicating the second energy storage converter to set the power of the second energy storage converter based on the received optical fiber signal, so that the sum of the set second power of the second energy storage converter and the power indicated in the received optical fiber signal is zero.

The invention provides a method for testing a power device and a test circuit for realizing the test method, and the method comprises the steps: applying a negative grid voltage to a grid of a to-be-tested device, and applying a test voltage to a source and a drain of the to-be-tested device, so as to carry out the body diode bipolar degradation test of the to-be-tested device; after the body diode bipolar degradation test is performed on the device to be tested, applying a grid pre-bias voltage to the grid of the device to be tested so as to eliminate the threshold drift of the device to be tested; and after the threshold drift of the to-be-tested device is eliminated, applying double-pulse voltage to the source electrode and the drain electrode of the to-be-tested device so as to perform double-pulse test on the to-be-tested device. According to the method, the problem that the threshold voltage drift of the silicon carbide device is not fully considered in the prior art is solved by applying the grid pre-bias voltage, the double-pulse test is directly carried out after the bipolar degradation experiment of the body diode is finished, the influence of inconsistent retest time on the test result is avoided, and meanwhile, the test efficiency is remarkably improved.

The invention provides a junction temperature measuring circuit of a vehicle inverter power device and a design method and application thereof. The junction temperature measuring circuit comprises two measuring circuits and a clamping power supply, wherein the two measuring circuits are respectively used for measuring two power devices of an upper bridge and a lower bridge; each measuring circuit comprises a self-adaptive switch and a clamping module, and the self-adaptive switch is configured to enable the potential of the measuring end to track the potential of the drain electrode or the source electrode of the measured power device when the measured power device enters a conducting state; when the tested power device is in the off state, the micro-conduction state between the drain electrode or the source electrode of the tested power device and the measuring end is kept; the clamping module realizes positive clamping voltage and negative clamping voltage through a clamping power supply, and the positive clamping voltage and the negative clamping voltage are respectively used for voltage clamping of a measuring end when the measured power device is in a turn-off state. According to the junction temperature measuring circuit provided by the invention, the working junction temperature of the power device of the high-speed switch can be measured timely and accurately.

The invention provides a robustness evaluation method based on a power equipment defect detection model, and relates to the technical field of power equipment defect detection, and the method comprises the steps: obtaining an original sample of a power defect detection image to build a training set and a test set; applying an adversarial attack algorithm to the test set to generate an adversarial sample; respectively inputting the training set and the confrontation sample into a to-be-tested power equipment defect detection model to obtain a classification result of the original sample and a classification result of the confrontation sample; calculating robustness evaluation indexes of the to-be-tested model according to classification results of the original samples and the adversarial samples; calculating weights of different evaluation indexes through an entropy weight method, and calculating a comprehensive score according to each weight to obtain an evaluation result; according to the method, the robustness difference of different models under adversarial attack is deeply analyzed, so that the accuracy and the reliability of defect detection of the power equipment are improved, the performance and the practicability of the deep learning model in a power defect detection scene are improved, and the method has wide application prospect and practical value.

The invention relates to the technical field of semiconductor manufacturing, and provides a method and a system for testing the service life of a power field effect transistor. The method comprises the following steps: acquiring test environment parameter information of a to-be-tested power field effect transistor in a database; the test environment parameter information comprises a plurality of environment parameter sets; for each environmental parameter set, performing an electrical performance test on the to-be-tested power field effect transistor in a test environment corresponding to the environmental parameter set to obtain electrical performance parameter information corresponding to the environmental parameter set; performing defect prediction on the to-be-tested power field effect transistor based on a preset defect prediction algorithm and the electrical performance parameter information to obtain defect prediction information; and predicting the service life of the power field effect transistor based on the defect prediction information. The method improves the accuracy of the life test result.

The invention provides a power cycle test method for a power device, and the method comprises the steps: carrying out the initial detection of a to-be-tested power device, obtaining an initial threshold voltage, and carrying out the power cycle test of the to-be-tested power device; under the condition that the to-be-tested power device is turned off in one power cycle and the junction temperature of the to-be-tested power device is reduced to a preset temperature condition, detecting to obtain a test threshold voltage of the to-be-tested power device, and calculating to obtain a threshold voltage change rate according to the initial threshold voltage and the test threshold voltage; and whether the to-be-tested power device is aged and fails is judged according to the threshold voltage change rate. According to the method, characteristic parameters collected in the power cycle process are calibrated in real time, whether a chip fails or not and packaging fails is judged according to parameter deviation values, threshold voltage is accurately tested in the power cycle turn-off process, and then on-line collected conduction voltage drop is calibrated; and synchronous online monitoring of the reliability and the packaging reliability of the silicon carbide chip is realized.

The invention provides a chip power consumption measurement system and method.The chip power consumption measurement system comprises a test board, a power consumption collection module and a control module, the control module sends task instructions to a chip to be tested, and the task instructions comprise any one or more of a voltage instruction, a frequency instruction and an operation core instruction; when the chip to be tested executes a task instruction, the power consumption acquisition module acquires voltage information of each test resistor and transmits the voltage information to the control module; the control module determines the test power consumption of the to-be-tested chip according to the voltage information. According to the technical scheme, the task instruction can be sent to the to-be-tested chip, any one or more of the working frequency, the working voltage and the number of the running cores of the to-be-tested chip can be changed, different use scenes can be simulated, power consumption measurement of the to-be-tested chip can be completed in different scenes, and the test power consumption of the to-be-tested chip can be accurately and rapidly obtained.

The invention relates to the technical field of direct current transmission detection, in particular to a device and method for testing power pipeline connection, and the device comprises a power parameter collection module which is used for collecting current signals and voltage signals in a power pipeline, measuring temperature values at a plurality of positions, obtaining insulation resistance at each node, and measuring grounding resistance of a plurality of grounding points; and summarizing the measurement data to generate an electric power parameter set. According to the invention, through integration and analysis of measurement data of current, voltage, temperature, insulation resistance and grounding resistance, comprehensive monitoring and evaluation of the state of the power pipeline are realized. After the data are integrated, by calculating the mean value, the variance and the peak value of the data and analyzing the spatial distribution of the temperature and the frequency characteristics of the grounding resistance, the understanding of the behavior of the power system is enhanced. According to the data analysis mode, the prediction capability of potential risks and the sensitivity of fault detection are improved, and serious equipment faults and service interruption are effectively avoided.

The invention discloses a system for LOCA accident simulation irradiation test and a design method, which are characterized in that a pressurized water reactor fuel element LOCA irradiation performance test is taken as a research object, a circulation loop and a test device are established, prototype reactor operation conditions and different accident process thermal hydraulic conditions are simulated, a fuel element LOCA irradiation simulation test is carried out, and a test result is obtained. The high-temperature and high-pressure water system is divided into three areas according to temperature and pressure, the three-stage cooling circulation system is combined with the detachable plate heat exchanger, and the number of the heat exchangers and the parameter coupling complexity among the three-stage system are reduced. The mode of combining circulation loop electric heating and in-pile device electric heating is adopted, the irradiation test thermal condition is controlled, the test power of the device is increased, the device adopts a long heat exchange flow channel, the natural circulation capacity is constructed, and the safety of the test device is improved; the invention provides a test method aiming at release working conditions of trace and massive gases and fission products, and a simulated irradiation test covering various accident working condition ranges is provided, so that the application range is wide.

The invention provides a real-time stability test platform and method for data acquisition of a power distribution control chip. The real-time stability test platform comprises a test power grid, an acquisition system, a to-be-tested control chip, a high-low temperature alternating box, an upper computer and a clock module, the upper computer is used for storing a plurality of test programs, controlling the high and low temperature alternating box and the test power grid to obtain different working conditions, calling the corresponding test programs according to the different working conditions, sending out corresponding control instructions, and performing stability analysis on the control chip to be tested according to the first test data and the second test data; and obtaining a stability test result. The problem that in the prior art, a single parameter testing method is difficult to comprehensively evaluate the stability of a control chip in an actual complex environment in real time is solved; according to the invention, the stability of the control chip is efficiently tested in real time, and the problems of difficult simulation of complex working conditions and multi-parameter coupling influence can be solved.

The invention is suitable for the technical field of communication, and particularly relates to a method for detecting mismatched harmonic waves of a power amplifier. The method comprises the steps that a first power detection unit is connected with a coupler through a control unit, the standing-wave ratio of a to-be-detected power amplifier chip is adjusted to be 1: 1 through a tuner, and the power of an input signal of a vector signal generator is adjusted till the target power of the to-be-detected power amplifier chip is reached; the second power detection unit is connected with the coupler through the control unit, the output standing-wave ratio of the to-be-detected power amplifier chip is adjusted to a preset specific value through the tuner, and when the tuner modulates phases at intervals of preset degrees, the harmonic power of the to-be-detected power amplifier chip in each phase is recorded through the second power detection unit. Compared with the prior art, the method can accurately test and evaluate the harmonic wave of the to-be-tested power amplifier chip under the mismatched standing wave condition, thereby evaluating the harmonic wave index of the to-be-tested power amplifier chip.

The invention provides a memory, in the memory, for a memory array sheet at a non-head-and-tail position, each bit line is coupled to a corresponding pressure test power supply, and the pressure test power supply corresponding to a first bit line is different from the pressure test power supply corresponding to an adjacent second bit line; for the storage array sheets at the head and tail positions, the first bit lines are coupled to the corresponding pressure test power supplies, and the pressure test power supplies corresponding to the first bit lines with odd numbers are different from the pressure test power supplies corresponding to the first bit lines with even numbers.

The invention discloses a test monitoring method and system for a combined transformer test power supply, and the method comprises the steps: carrying out the test monitoring of a target test power supply, obtaining power supply test monitoring information, carrying out the data preprocessing of the power supply test monitoring information, and obtaining the preprocessing result information; an anomaly detection model is constructed, preprocessing result information is input to detect operation anomaly data occurring during power supply testing, and anomaly detection information is obtained; performing trend analysis based on the abnormal detection information, predicting the change of the power supply test monitoring data at the future moment, and detecting an abnormal trend to obtain abnormal trend detection information; extracting abnormal features based on the abnormal trend detection information, presetting a risk assessment rule, and performing risk assessment according to the extracted abnormal features to obtain risk assessment information; according to the risk assessment information, it is judged that a test safety risk exists, and if yes, a fuzzy controller is used for generating a regulation and control scheme for regulation and control, so that the safety and reliability of power supply testing are guaranteed.

The utility model provides an adjustable pulse generator. The adjustable pulse generator comprises an input unit, a control unit and a driving circuit, the input unit is used for receiving a PWM signal parameter value input by a user; the control unit is used for outputting a PWM signal with a preset frequency and a preset duty ratio based on a PWM signal parameter value input by a user; and the driving circuit is used for modulating the PWM signal output by the control unit so as to drive the power semiconductor device to be tested. According to the adjustable pulse generator provided by the invention, parameters such as the frequency and the duty ratio of the pulse signal are adjustable, the circuit structure is simple, the cost is relatively low, and the size of a test tool is reduced.

The utility model discloses an integrated test control system of a power module. The integrated test control system comprises an NTC test loop and an insulation test loop. The system also comprises a change-over switch. The insulation voltage-withstanding tester passes through the NTC test loop and then leads out an NTC test terminal. An insulation test terminal is led out from the insulation voltage-withstanding tester through an insulation test loop; and the insulation test terminal and the NTC test terminal are respectively connected to the test end of the power module to be tested through the change-over switch. Compared with the prior art, the testing device has the advantages that two testing procedures are integrated together, different testing procedures can be rapidly switched through the change-over switch, NTC testing and insulation testing can be rapidly completed, testing efficiency is improved, the procedures of insulation testing and NTC isolation testing are simplified, and operation efficiency is improved.

The invention provides a reliability test system and method, and relates to the field of power devices, the reliability test system can carry out a high-temperature gate bias test and a high-temperature reverse bias test, multiple test modes are realized in one reliability test system, and the test efficiency is improved. Moreover, the reliability test system can apply an alternating signal to the to-be-tested device, thereby truly restoring an actual application scene, and enabling the reliability test system provided by the invention to accurately test the reliability of the power device. After the stress is applied, detection can be carried out immediately, and the relaxation effect of the power device is prevented from influencing the test result. Besides, in the high-temperature gate offset test, the pulse frequency or duty ratio of the electric stress pulse signal can be controlled through the half-bridge circuit, the parameters of the pulse signal can be flexibly changed by the reliability test system for different power devices, and the test applicability is improved.

The utility model relates to a power supply monitoring circuit and electronic equipment, belongs to the technical field of power supply monitoring, and is used for monitoring power supply voltage in real time. The power supply monitoring circuit comprises a photoelectric coupler, a resistor R4, a first voltage stabilizing source, a second voltage stabilizing source, a first voltage dividing unit and a second voltage dividing unit, and a tested power supply is connected with the reference end of the first voltage stabilizing source and the reference end of the second voltage stabilizing source through the first voltage dividing unit and the second voltage dividing unit respectively. The cathode of the first voltage stabilizing source is connected with the reference end of the second voltage stabilizing source; the input positive end and the input negative end of the photoelectric coupler are respectively connected with the output end of the tested power supply and the cathode of the second voltage stabilizing source; the resistor R4 is connected in parallel between the input positive end and the input negative end of the photoelectric coupler, and the output end of the photoelectric coupler is connected with a reference voltage and outputs a monitoring signal. According to the utility model, when the power supply voltage is lower than a normal power supply range, the monitoring signal generates an overturning level, and real-time monitoring of the power supply voltage is realized.

The invention discloses a broadband oscillation characterization platform of a multi-chip power module and a near-field characteristic evaluation method, and belongs to the technical field of power electronics. The continuous operation condition of the power converter is decoupled into a series of discrete switching points, transient near-field radiation data of a to-be-tested power module under the discrete switching points are obtained through a double-pulse test, and near-magnetic field radiation signals are reconstructed; performing time-frequency analysis on the reconstructed near magnetic field radiation signal to generate a two-dimensional time-frequency matrix; and calculating a radiation energy entropy value based on the two-dimensional time-frequency matrix, fusing the radiation energy entropy value with the peak amplitude in the two-dimensional time-frequency matrix to generate a comprehensive EMI index for evaluating the broadband oscillation electromagnetic interference risk, and triggering EMI risk early warning when the comprehensive EMI index exceeds a threshold value. According to the method, the spectrum complexity is quantified through the radiation energy entropy, the multi-dimensional EMI risk assessment is carried out by fusing the peak amplitude of the time-frequency matrix, and the broadband oscillation in the multi-chip parallel power module can be accurately and efficiently represented.

The invention belongs to the technical field of testing equipment, and particularly discloses a fastener locking effect overhaul testing device which comprises a base, a testing power mechanism is arranged on the outer side of the base, an air pressure stabilizing mechanism is arranged outside the base and used for stabilizing air pressure, and a testing mechanism is arranged in the base and used for testing the locking effect of a fastener. The test power mechanism provides test power for the test mechanism, one side of the test mechanism is provided with a sealing mechanism, the sealing mechanism is used for forming a sealed space with the test mechanism, the test power mechanism comprises a motor, the bottom of the motor is fixedly connected to the interior of one side of the base, and the bottom of the motor is fixedly connected to the interior of the other side of the base. And the output end of the motor is fixedly connected with an eccentric wheel. Through the combination of the test power mechanism, the air pressure stabilizing mechanism and the test mechanism, air pressures in different environments can be simulated while a vibration anti-falling test can be carried out, so that the multifunctionality of the device is realized, and the practicability of the device is further improved.

The invention discloses a power electronic equipment radiation emission level evaluation method and device based on a reverberation chamber, a medium and equipment. The method comprises the following steps: acquiring a reverberation chamber radiation receiving power sample and a transmission coefficient sample; obtaining a radiation power calculation model of the to-be-tested power electronic equipment, constructing a radiation power function of the to-be-tested power electronic equipment, and obtaining a probability density function of a radiation power estimation value and an uncertainty model based on the radiation power function of the to-be-tested power electronic equipment; evaluating a first radiation emission level of the to-be-tested power electronic equipment based on the radiation power calculation model and the uncertainty model; the second radiation emission level is determined according to the radiation power function of the power electronic equipment to be measured, so that the statistical distribution characteristics of the electromagnetic field in the reverberation chamber can be accurately described, and the influence of the independent sampling number on the measurement uncertainty can be quantitatively analyzed; effective evaluation of statistical characteristics and measurement uncertainty of radiation emission of power electronic equipment is realized.

The invention discloses an inertia and damping coefficient detection method, system and device of power electronic equipment, and relates to the technical field of power electronics, and the method comprises the steps: obtaining the AC voltage and AC current of to-be-detected power electronic equipment in real time; determining a frequency and a frequency change rate based on the AC voltage; determining active power based on the AC voltage and the AC current; generating a disturbance signal based on the frequency, the active power, the AC voltage or the AC current; when the disturbance signal is 0, no processing is carried out; when the disturbance signal is 1, obtaining a frequency vector, a frequency change rate vector and an active power vector during disturbance based on the frequency, the frequency change rate and the active power; and based on the frequency vector, the frequency change rate vector and the active power vector, determining an inertia coefficient and a damping coefficient of the to-be-tested power electronic equipment. The inertia and damping coefficient of the power electronic equipment can be accurately detected on line in real time, so that the dynamic behavior of the power electronic equipment can be reflected more comprehensively.

The utility model relates to the technical field of audio product testing, and provides an audio power amplifier equipment testing system, which comprises audio conversion equipment, channel switching equipment and testing equipment, the audio conversion equipment is used for receiving a first audio signal of a sound source, realizing output of multiple paths of second audio signals and transmitting the multiple paths of second audio signals to the power amplifiers to be tested in a one-to-one correspondence manner; the channel switching equipment is used for controlling the plurality of to-be-tested power amplifiers to be connected with the test equipment in sequence, and the test equipment comprises a loudspeaker or an audio analyzer. According to the utility model, through establishing consistent test channels for different to-be-tested power amplifiers, subjective or objective test comparison can be accurately carried out on the different to-be-tested power amplifiers, and in an actual test, the difference of different audio power amplifier devices in the same batch can be effectively identified, and the test cost is saved.

The invention provides a memory test circuit. The memory test circuit comprises a memory module. The storage module comprises a test power supply end, a current test end, a test interface, a memory, a selector, a test logic module and a control module, the test interface is connected with the test logic module, and the current test end is connected with the memory. And when the storage module is in a working mode, the selector connects the memory with the control module. The memory module enters a test mode through a test command, when the memory module is in the test mode, the test power supply end supplies power to the memory, the selector connects the test logic module with the memory, and the test logic module is connected with the memory. And performing serial communication with the test logic module through the test interface to test the storage module. Therefore, the performance of the memory under different conditions can be detected, and the chips which cannot reach various performance indexes can be screened out, so that the subsequent packaging cost is saved.

The invention discloses a server power supply board testing method and system, electronic equipment and a storage medium, and relates to the technical field of server power supply board testing, and the method comprises the steps: inputting a testing power supply signal to a server power supply board, and verifying the triggering accuracy of overvoltage protection and undervoltage protection functions of the server power supply board; after a preset power supply signal is converted by a solid-state relay, voltage loading and detection are carried out on a power supply input interface one by one channel, and after it is verified that a power supply protection function and an input interface state are normal, multi-type load fluctuation and communication protocol interaction requirements of a server are dynamically reproduced through a function analog signal. The output stability and protocol compatibility of the server power supply board are evaluated by combining an electronic load dynamic discharge test with a digital signal collaborative feedback mechanism, so that the technical problems of relatively low test efficiency and relatively high test cost of the server power supply board in related technologies are solved, and the purposes of reducing the test cost, improving the test efficiency and improving the test efficiency are achieved. And the test coverage rate is increased.

The invention relates to the technical field of intelligent testing, in particular to an intelligent testing method, device and equipment of a photovoltaic inverter and a storage medium. The method comprises the following steps: obtaining photovoltaic inverter structure data; performing shielding simulation device deployment on the photovoltaic inverter structure data to generate photovoltaic module shielding simulation device deployment data; carrying out key structure data acquisition on the structure data of the photovoltaic inverter through the deployment data of the photovoltaic module shielding simulation device, and obtaining the operation data of the standard photovoltaic inverter; and performing shielding test scene simulation on the deployment data of the photovoltaic module shielding simulation device to obtain photovoltaic inverter joint test power data. According to the invention, by introducing shielding simulation, dynamic current-voltage analysis, anti-shielding capability prediction and evaluation and data visualization, a performance detection process of the photovoltaic inverter in a shielding state is provided, and the intelligent level of the test and the reliability of the test result are improved at the same time.

The invention discloses a high-power alternating-current impedance excitation circuit, a control method thereof and an electrolysis test system, and belongs to the technical field of power supplies and power electronics, the circuit is used as an alternating-current power supply in a high-capacity electrolysis test power supply, and the circuit is controlled by a controller to output an alternating-current signal so as to carry out an impedance test on an electrolytic bath. Compared with a full-bridge circuit, the alternating-current impedance excitation circuit adopts the multi-level converter, so that the output current harmonic content is low, the electrolysis efficiency is improved, the equipment loss is reduced, the economical efficiency of an electrolysis system is improved, stable operation of an electrolytic bath is ensured, and electrolysis interruption or faults caused by voltage fluctuation are reduced.

The invention discloses a fault detection method and system for an SVF multi-stage full-bridge sub-module in an SLCC, and the method comprises the steps: constructing a converter valve test model which comprises a converter valve, a valve control unit and a low-pressure pressurization unit; wherein the converter valve comprises a full-bridge sub-module; based on a valve tower structure, wiring complexity and test voltage safety, performing number optimization on series connection and parallel connection of full-bridge sub-modules, and setting test power supply voltage; and based on the topological structure of the full-bridge sub-modules, performing low-voltage pressurization test on the full-bridge sub-modules by using a low-voltage pressurization unit to obtain the working states of the full-bridge sub-modules, judging faults of the full-bridge sub-modules connected in series, and positioning fault positions. According to the method, the detection efficiency of the multi-stage full-bridge sub-module is improved, all the full-bridge sub-modules of the valve tower can be rapidly and accurately detected and diagnosed only through one-time wiring, the field handover test time is shortened, and SLCC direct-current power transmission project construction is supported.