Double glass iv tester

Abstract

The application discloses a double-glass IV tester, which comprises a main control unit, an adaptive wide-range electronic load module, a multi-channel synchronous sampling unit, at least two irradiance meter interfaces, a temperature acquisition module, a man-machine interaction unit, a local storage module, a wireless communication module and a built-in power supply battery. The adaptive wide-range electronic load module is connected with the main control unit and a component to be measured, and comprises a multi-gear resistor array and a switch matrix, and is used for providing a variable load in a voltage range of 0-2000V and a current range of 0-40A. The multi-channel synchronous sampling unit is connected with the main control unit, the adaptive wide-range electronic load module, the irradiance meter interface and the temperature acquisition module respectively, and is used for synchronously collecting voltage, current, irradiance and temperature signals. The application does not need to install an optical shield on the back of the component, is simple to operate, has a wide range coverage, high testing precision, and is suitable for on-site detection and long-term operation and maintenance evaluation of various double-sided double-glass components and high-voltage component strings.

Description

Technical Field

[0001] This invention belongs to the technical field of photovoltaic module testing equipment, specifically relating to a double-glass IV tester. Background Technology

[0002] With the rapid development of the global photovoltaic industry, bifacial double-glass photovoltaic modules have gradually become the mainstream product in the market due to their higher power generation efficiency and longer service life. Unlike traditional single-sided modules, bifacial double-glass modules are encapsulated with glass on both sides, and the back side can receive ground-reflected light and ambient scattered light to generate electricity, which can increase power generation by 10% to 30%.

[0003] IV characteristic testing is a core method for evaluating the electrical performance of photovoltaic modules and diagnosing module faults. The IV curve tester applies a variable load to the photovoltaic module and scans to obtain a complete current-voltage characteristic curve, from which key parameters such as open-circuit voltage, short-circuit current, maximum power, maximum power point voltage, maximum power point current, fill factor, and conversion efficiency can be extracted.

[0004] Currently, portable IV testing devices on the market mainly have the following shortcomings:

[0005] (1) When testing bifacial double-glass modules with existing testing instruments, a light-shielding plate needs to be installed on the back of the module to block the incident light from the back, and the bifacial module is tested as a single-glass module. This method requires additional light-shielding equipment, which is extremely inconvenient to operate on site and has low testing efficiency. Moreover, the light-shielding effect is affected by the installation method and the ambient scattered light, making it difficult to guarantee complete light shading, resulting in systematic errors in the test results and failing to accurately reflect the true front power generation performance of the module.

[0006] (2) The mainstream portable IV tester has a range of 1500V / 20A, which cannot meet the testing requirements of high-voltage strings and high-current modules such as half-cell and shingled modules in 1500V systems. Under low temperature conditions, the open-circuit voltage of strings can reach more than 1800V, and the operating current of half-cell modules can reach more than 20A, which cannot be covered by the existing range.

[0007] (3) Existing testing instruments typically require 800W / m 2 Under the above irradiation conditions, the IV curve was severely distorted due to insufficient irradiance in low irradiation environments, resulting in large errors in the test results and making effective testing impossible. This severely limited the time window for on-site testing.

[0008] (4) Most existing test instruments are single manual test modes, which cannot continuously monitor the components for a long time, make it difficult to evaluate the performance changes of the components under different irradiation and temperature conditions, and also cannot automatically calculate long-term operating indicators such as the power plant PR value.

[0009] (5) Existing test instruments usually only support single-channel irradiance meters and require manual calibration of parameters, which is complicated to operate; for bifacial component testing, it is necessary to measure the irradiance of both the front and back sides at the same time, which a single-channel irradiance meter cannot meet.

[0010] Therefore, it is necessary to provide a double-glass IV tester to address the aforementioned technical issues.

[0011] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0012] The purpose of this invention is to provide a double-glass IV tester that can solve the problems mentioned above in the background.

[0013] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0014] The dual-glass IV tester includes a main control unit, an adaptive wide-range electronic load module, a multi-channel synchronous sampling unit, at least two radiometer interfaces, a temperature acquisition module, a human-machine interaction unit, a local storage module, a wireless communication module, and a built-in power supply battery.

[0015] The adaptive wide-range electronic load module is connected to the main control unit and the component under test (DUT). The adaptive wide-range electronic load module includes a multi-level resistor array and a switch matrix, used to provide a variable load within a voltage range of 0–2000V and a current range of 0–40A. The multi-channel synchronous sampling unit is connected to the main control unit, the adaptive wide-range electronic load module, the radiometer interface, and the temperature acquisition module, respectively, for synchronously acquiring voltage, current, irradiance, and temperature signals. At least two radiometer interfaces are used to connect to the front radiometer and the back radiometer, respectively. The main control unit synchronously acquires the front and back irradiance values ​​at the start of IV scanning, and determines the pure front power generation parameters from the measured IV data based on the front and back irradiance values ​​and the bifaciality ratio parameters of the DUT, while simultaneously controlling the human-machine interface unit to display and / or store the test results.

[0016] In one or more embodiments of the present invention, a component database storage module is further included. The component database storage module pre-stores correction parameters for various component models. The human-computer interaction unit is provided with a double-sided component test mode option. In the double-sided component test mode, the main control unit calls the double-sided ratio parameter and temperature coefficient of the corresponding component model in the component database storage module to convert the test results into standard test conditions.

[0017] In one or more embodiments of the present invention, the adaptive wide-range electronic load module includes at least two range settings, wherein the first range is 0-1000V / 0-20A and the second range is 0-2000V / 0-40A. The main control unit performs pre-detection on the components before scanning to obtain the open-circuit voltage and short-circuit current, and automatically selects the range setting based on the pre-detection results.

[0018] In one or more embodiments of the present invention, the multi-level resistor array includes multiple binary weighted power resistors and high-speed switches. The main control unit changes the load resistance value by controlling the on / off state of each switch in the switch matrix, thereby achieving IV curve scanning with at least 2048 scanning points.

[0019] In one or more embodiments of the present invention, the multi-channel synchronous sampling unit includes an analog-to-digital converter and a baseline dynamic compensation circuit, and the main control unit adjusts the sampling integration time and filtering parameters of the analog-to-digital converter according to the current irradiance to suppress noise under low irradiance conditions.

[0020] In one or more embodiments of the present invention, the main control unit enters a low-irradiance test mode when the current irradiance is lower than a preset threshold. In the low-irradiance test mode, the main control unit controls the multi-channel synchronous sampling unit to extend the sampling integration time and controls the adaptive wide-range electronic load module to reduce the scanning speed. Subsequent processing is performed after the IV curve stabilizes.

[0021] In one or more embodiments of the present invention, a timer module is also included, wherein the main control unit automatically starts IV testing periodically according to the test interval set by the user, stores the irradiation, temperature, and IV characteristic parameters in the local storage module in a time series, and automatically calculates the system performance ratio based on the time series.

[0022] In one or more embodiments of the present invention, the radiometer interface is also used to read calibration information from the radiometer's built-in storage chip. The main control unit automatically identifies the radiometer model and calls the corresponding calibration coefficient based on the calibration information, and automatically allocates the front channel and the back channel.

[0023] In one or more embodiments of the present invention, the built-in power supply battery is a lithium battery, and the tester further includes a charging management circuit. During the test, the main control unit controls the component under test to charge the lithium battery through the test circuit, thereby realizing the reuse of the test circuit and the charging circuit.

[0024] In one or more embodiments of the present invention, a high-voltage isolation protection circuit is further included, wherein the isolation voltage of the high-voltage isolation protection circuit is not less than 4000V.

[0025] Compared with the prior art, the double-glass IV tester of the present invention has the following technical advantages:

[0026] (1) The power generation performance of the front side can be accurately measured without adding a shading plate to the back of the module. The error of the front STC power test can be controlled within ±3%, which is significantly improved compared with the traditional shading method. The test time of a single module is shortened by about 50%.

[0027] (2) It can achieve a voltage range of 0 to 2000V and a current range of 0 to 40A, which can fully cover the testing needs of high-voltage strings and high-current components such as half-cell and shingled modules in 1500V systems.

[0028] (3) The effective test irradiation range is extended to 100W / m 2 The above significantly extends the effective testing time per day, making it particularly suitable for testing work in high-latitude regions or under cloudy weather conditions.

[0029] (4) Supports continuous automatic IV testing with a minimum interval of 20 seconds, and can automatically calculate PR value, providing more comprehensive data support for power plant operation and maintenance assessment.

[0030] (5) Supports simultaneous access of multiple radiometers, automatically identifies the model and loads calibration parameters, eliminating the need for manual settings and making operation more convenient.

[0031] (6) Multi-level high-voltage isolation design ensures operational safety, and built-in lithium battery supports long-term outdoor work. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a system block diagram of a double-glass IV tester according to an embodiment of the present invention;

[0034] Figure 2 This is a flowchart of the testing process of a double-glass IV tester according to an embodiment of the present invention;

[0035] Figure 3 This is a block diagram of a multi-channel synchronous sampling unit in one embodiment of the present invention;

[0036] Figure 4 This is a perspective view of the double-glass IV tester in one embodiment of the present invention. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0038] like Figures 1 to 4 As shown, the dual-glass IV tester in one embodiment of the present invention includes a main control unit, an adaptive wide-range electronic load module, a multi-channel synchronous sampling unit, at least two radiometer interfaces, a temperature acquisition module, a human-machine interaction unit, a local storage module, a wireless communication module, and a built-in power supply battery.

[0039] The adaptive wide-range electronic load module is connected to the main control unit and the component under test. The multi-channel synchronous sampling unit is connected to the main control unit, the adaptive wide-range electronic load module, the radiometer interface, and the temperature acquisition module, respectively. The main control unit is also connected to the human-machine interface unit, the local storage module, and the wireless communication module, respectively.

[0040] Specifically, the adaptive wide-range electronic load module includes a multi-stage resistor array and a switch matrix to provide a variable load within a voltage range of 0–2000V and a current range of 0–40A. The multi-stage resistor array consists of multiple binary-weighted power resistors and high-speed switches. The main control unit changes the load resistance by controlling the on / off state of each switch in the switch matrix, achieving IV curve scanning at least 2048 scanning points.

[0041] Furthermore, the adaptive wide-range electronic load module includes at least two range settings: the first range is 0–1000V / 0–20A, and the second range is 0–2000V / 0–40A. Before scanning, the main control unit performs pre-detection on the components to obtain open-circuit voltage and short-circuit current, and automatically selects the range setting based on the pre-detection results to avoid exceeding the range and ensure sampling accuracy.

[0042] During the pre-detection phase, the main control unit first applies a small voltage probe signal to obtain the initial open-circuit voltage Voc of the component. test and short-circuit current Isc test If Voc test ≤1000V and Isc test If the current is ≤20A, it will automatically switch to the first level and use a high-precision resistor array for scanning. If Voc test >1000V or Isc test If the current is greater than 20A, it will automatically switch to the second gear and activate the high-power load branch, while adjusting the sampling attenuation coefficient to ensure that the analog-to-digital converter does not exceed the range.

[0043] like Figure 3 As shown, the multi-channel synchronous sampling unit includes an analog-to-digital converter and a baseline dynamic compensation circuit, used to synchronously acquire voltage, current, irradiance, and temperature signals. The main control unit adjusts the sampling integration time and filtering parameters of the analog-to-digital converter according to the current irradiance to suppress noise under low irradiance conditions. When the current irradiance is lower than a preset threshold, the main control unit enters a low-irradiance test mode, controls the multi-channel synchronous sampling unit to extend the sampling integration time, and controls the adaptive wide-range electronic load module to reduce the scanning speed. Subsequent processing is performed after the IV curve stabilizes.

[0044] In addition, the main control unit also executes a wide irradiance range adaptive correction algorithm. When the irradiance is 800 W / m²... 2 For the above, the first sampling integration time T1 and the first scan rate V1 are set to achieve rapid testing. When the irradiance is between 300-800 W / m²... 2 During this period, a second sampling integration time T2 and a second scan rate V2 are set to balance speed and accuracy. When the irradiance is below 300 W / m²... 2 And higher than 100W / m 2 When the low-irradiance mode is entered, the third sampling integration time T3 and the third scan rate V3 are set, and the digital filtering algorithm is started to perform moving average or median filtering on adjacent sampling points to effectively suppress weak signal noise and improve IV curve distortion.

[0045] In the low-irradiance testing mode, the main control unit uses the key parameters of the measured IV curve to deduce the single-diode model parameters, including the photocurrent Iph, the diode reverse saturation current Io, the series resistance Rs, the parallel resistance Rsh, and the diode ideality factor n. Then, it uses the model parameters to reconstruct the ideal IV curve, eliminating curve distortion under low irradiance and achieving 100W / m. 2 Accurate testing under low-irradiation conditions.

[0046] like Figure 1 As shown, at least two radiometer interfaces are used to connect to the front radiometer and the rear radiometer, respectively. The radiometer interfaces are also used to read calibration information from the radiometer's built-in storage chip. The main control unit automatically identifies the radiometer model based on the calibration information, retrieves the corresponding calibration coefficients, and automatically allocates the front channel and the rear channel.

[0047] Furthermore, the instrument simultaneously triggers multi-channel irradiance sampling while initiating IV scanning, using a unified timestamp to ensure strict temporal correspondence between irradiance data and IV data. A built-in automatic calibration program allows for automatic identification and one-click calibration of radiometer parameters, eliminating the need for manual, line-by-line settings and meeting the requirements for synchronous acquisition of illumination data for bifacial modules.

[0048] In addition, the irradiometer interface uses I2C or a single-bus protocol, and the irradiometer's built-in memory chip stores the irradiometer model, unique serial number, and factory calibration coefficient K. cal The main control unit actively polls each channel after power-on, reads chip data, automatically identifies the model by comparing it with the internal database, and automatically assigns it to the front or back channel. If it fails to identify the model, it prompts the user to enter the information manually. If the identification is successful, it automatically loads the calibration coefficient K. cal and the measured irradiance G raw Multiply by K cal As the final valid value.

[0049] In this embodiment, the radiometer interface is three-way, which can simultaneously connect to the front irradiation probe, the back irradiation probe, and the backup channel.

[0050] In this embodiment, the component database storage module pre-stores correction parameters for various component models, and the human-computer interaction unit has a double-sided component testing mode option. In the double-sided component testing mode, the main control unit calls the double-sided ratio parameters and temperature coefficient of the corresponding component model from the component database storage module to convert the test results to standard test conditions.

[0051] During testing, the operator connects the front and rear radiometers to their respective interfaces, connects the test leads to the bifacial double-glass module under test, and selects either the bifacial module testing mode or continuous monitoring mode via the human-machine interface. The main control unit first reads the radiometer calibration information and automatically configures the channels, then performs pre-testing on the module to determine the measurement range. The main control unit initiates the IV scan, simultaneously acquiring the front and rear irradiance values ​​and module temperature. The adaptive wide-range electronic load module adjusts the load according to the preset scan points, and the multi-channel synchronous sampling unit simultaneously records voltage and current data. After the scan is completed, the main control unit determines the pure front power generation parameters from the measured IV data based on the front and rear irradiance values ​​and the bifaciality ratio parameters of the module under test, while simultaneously controlling the human-machine interface to display and / or store the test results.

[0052] Specifically, the main control unit decomposes the front-side generated power from the measured total power in the following manner:

[0053]

[0054]

[0055] in, To measure the maximum power, and Irradiance on the front and back sides, respectively. This refers to the double-sided ratio parameter.

[0056] Furthermore, in obtaining pure positive power Subsequently, the main control unit uses a dedicated STC conversion model for bifacial modules to correct for standard conditions. Unlike traditional methods that only use frontal irradiance correction, this model also incorporates frontal irradiance. Backside equivalent irradiance G back_eff (Its measured value by the back radiometer) Multiply by the double-sided ratio (Calculated), component temperature T module and ambient temperature T amb .

[0057] When making specific corrections, first consider the temperature coefficient. , Temperature correction is applied to voltage and current, and then based on the irradiance correction factor. Combined effective irradiance of both front and back sides Irradiation correction was performed to adjust the measured frontal power. Corrected to STC (1000W / m) 2 P under the condition of 25℃ STC The corrected formula is:

[0058]

[0059] in The coefficient is the temperature coefficient, and the spectral correction factor K is taken into account. spectrum This process eliminates the need to install a light-shielding plate on the back of the component, thus eliminating systematic errors introduced by the light-shielding operation and significantly reducing the testing time for a single component.

[0060] The timer module allows users to set test intervals, with a minimum of 20 seconds. The main control unit automatically starts IV tests periodically according to the set intervals, and stores the irradiation, temperature, and IV characteristic parameters in the local storage module in a time series, as well as automatically calculates the system performance ratio (PR) based on the time series.

[0061] In this embodiment, the time-series data processing and automatic PR calculation algorithm are as follows: The main control unit periodically performs continuous automatic IV testing, and records the timestamp t, irradiance G(t), component temperature T(t), and actual power P for each test. actual (t) and P converted to STC STC (t). When calculating the PR value, the cumulative effective irradiance within the time period is calculated first. ,in For the testing interval, G(t) must be greater than a preset threshold to avoid interference from nighttime and extremely low irradiance data. Then, the cumulative power generation within the time period is calculated. Finally, according to Calculate the system performance ratio, where P STC_nominalThis represents the nominal STC power of the component. The algorithm automatically removes invalid data points due to sudden drops in irradiance or abnormal temperatures, and generates a time series curve of the PR value changing over time, enabling long-term performance trend assessment of the component.

[0062] like Figure 1 As shown, the built-in power supply battery is a lithium battery, and the tester also includes a charging management circuit. During the test, the main control unit controls the component under test to charge the lithium battery through the test circuit, realizing the reuse of the test circuit and the charging circuit, thus improving the battery life. The tester also includes a high-voltage isolation protection circuit, with an isolation voltage of not less than 4000V and a safety level of CATIII 2000V.

[0063] In other alternative implementations, the adaptive wide-range electronic load module can also be an electronic load or a capacitor-resistance hybrid load; bifacial power decomposition can be achieved using a correction method based on spectral response or a machine learning method; low-irradiance compensation can also be achieved using a dual-diode model or empirical formula correction; wireless communication methods can include LoRa, ZigBee, RS485, USB, WiFi, or 4G / 5G; the number of radiometer interfaces can be expanded; and power supply methods can include an external portable power supply, a solar power bank, etc.

[0064] In practical use, after the main control unit is powered on, it first reads the calibration information from the built-in storage chips of the front and rear radiometers through the radiometer interface, automatically identifies the radiometer model and loads the corresponding calibration coefficients, and automatically allocates the front and rear channels. Subsequently, the main control unit retrieves the bifaciality, temperature coefficient and other STC correction parameters of the selected component model from the component database storage module, completing the basic data preparation before testing.

[0065] The main control unit applies a small voltage probe signal to the component under test to quickly obtain estimated values ​​of its open-circuit voltage Voc and short-circuit current Isc. Based on the pre-detection results, the main control unit automatically switches the range of the adaptive wide-range electronic load module according to the preset judgment logic, and simultaneously adjusts the sampling attenuation coefficient of the analog-to-digital converter to ensure that the optimal sampling resolution is obtained without exceeding the range.

[0066] After the main control unit issues the IV scan start command, the adaptive wide-range electronic load module gradually increases the resistance from the open-circuit state to the short-circuit state according to the switching sequence of the binary weighted resistor array, realizing load changes at least 2048 scan points. At the same time, the multi-channel synchronous sampling unit synchronously collects the voltage and current signals flowing through the component under test, the irradiance data of the front and rear radiometers, and the component temperature signal collected by the temperature sensor, based on a unified timestamp, ensuring that all measurement data are strictly synchronized in time.

[0067] The main control unit monitors the irradiance value in real time and automatically adjusts the sampling integration time and scanning rate according to the current irradiance. When the irradiance is lower than the preset threshold, it automatically enters the low-irradiance test mode: extending the sampling integration time to suppress noise, reducing the scanning speed to collect stable data, and triggering the low-irradiance compensation algorithm. It uses the key parameters of the measured IV curve to back-calculate the single diode model parameters and then reconstructs the ideal IV curve, thereby eliminating the distortion effect under low irradiance.

[0068] After scanning, the main control unit uses the front irradiance, back irradiance, and the bifacial ratio of the component under test to... The power increment generated by back-side reflected light is extracted from the measured total power to obtain the pure front-side power generation. Subsequently, the main control unit combines multiple parameters such as front-side irradiance, back-side equivalent irradiance, module temperature, and ambient temperature, and uses a dedicated STC conversion model for bifacial modules to correct the measured front-side power to the results under standard test conditions.

[0069] If the user configures the system to continuous automatic monitoring mode, the main control unit periodically repeats the above test process according to the set test interval, and stores the irradiance, temperature, IV characteristic parameters, and converted STC power of each test in the local storage module in a time series. The built-in time-series data processing algorithm performs statistical analysis on the accumulated data, automatically removes invalid data points, calculates the effective irradiance and power generation within the time period, and then automatically generates the trend curve of the system performance ratio.

[0070] Throughout the testing process, the main control unit controls the component under test (DUT) to charge its built-in lithium battery via the test circuit through the charging management circuit, achieving energy recovery. Test results are simultaneously displayed on a color touchscreen and stored in local memory. They can also be uploaded to a remote terminal via a wireless communication module, enabling seamless integration between on-site testing and cloud management.

[0071] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0073] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0074] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0075] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0076] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-glass IV tester, characterized in that, include: The system includes a main control unit, an adaptive wide-range electronic load module, a multi-channel synchronous sampling unit, at least two radiometer interfaces, a temperature acquisition module, a human-machine interaction unit, a local storage module, a wireless communication module, and a built-in power supply battery. The adaptive wide-range electronic load module is connected to the main control unit and the component under test. The adaptive wide-range electronic load module includes a multi-level resistor array and a switch matrix, which are used to provide a variable load within the voltage range of 0 to 2000V and the current range of 0 to 40A. The multi-channel synchronous sampling unit is connected to the main control unit, the adaptive wide-range electronic load module, the irradiance interface and the temperature acquisition module respectively, and is used to synchronously acquire voltage, current, irradiance and temperature signals; The at least two radiometer interfaces are used to connect to the front radiometer and the back radiometer, respectively; The main control unit synchronously acquires the front irradiance value and the back irradiance value at the start of IV scanning, and determines the pure front power generation parameters from the measured IV data based on the front irradiance value, the back irradiance value and the bifacial ratio parameter of the component under test, while controlling the human-machine interaction unit to display and / or store the test results.

2. The double-glass IV tester according to claim 1, characterized in that, It also includes a component database storage module, which pre-stores correction parameters for various component models. The human-computer interaction unit has a double-sided component test mode option. In the double-sided component test mode, the main control unit calls the double-sided ratio parameters and temperature coefficient of the corresponding component model in the component database storage module to convert the test results to standard test conditions.

3. The double-glass IV tester according to claim 1, characterized in that, The adaptive wide-range electronic load module includes at least two range settings, wherein the first range is 0~1000V / 0~20A and the second range is 0~2000V / 0~40A. The main control unit performs pre-detection on the component before scanning to obtain the open-circuit voltage and short-circuit current, and automatically selects the range setting based on the pre-detection results.

4. The double-glass IV tester according to claim 3, characterized in that, The multi-level resistor array includes multiple binary weighted power resistors and high-speed switches. The main control unit changes the load resistance by controlling the on / off state of each switch in the switch matrix, thereby achieving IV curve scanning at least 2048 scanning points.

5. The double-glass IV tester according to claim 1, characterized in that, The multi-channel synchronous sampling unit includes an analog-to-digital converter and a baseline dynamic compensation circuit. The main control unit adjusts the sampling integration time and filtering parameters of the analog-to-digital converter according to the current irradiance to suppress noise under low irradiance conditions.

6. The double-glass IV tester according to claim 5, characterized in that, When the current irradiance is lower than a preset threshold, the main control unit enters a low-irradiance test mode. In the low-irradiance test mode, the main control unit controls the multi-channel synchronous sampling unit to extend the sampling integration time and controls the adaptive wide-range electronic load module to reduce the scanning speed. Subsequent processing is performed after the IV curve stabilizes.

7. The double-glass IV tester according to claim 1, characterized in that, It also includes a timer module, in which the main control unit automatically starts IV testing periodically according to the test interval set by the user, stores the irradiation, temperature, and IV characteristic parameters in the local storage module in a time series, and automatically calculates the system performance ratio based on the time series.

8. The double-glass IV tester according to claim 1, characterized in that, The radiometer interface is also used to read calibration information from the radiometer's built-in storage chip. The main control unit automatically identifies the radiometer model and calls up the corresponding calibration coefficients based on the calibration information, and automatically allocates the front channel and the back channel.

9. The double-glass IV tester according to claim 1, characterized in that, The built-in power supply battery is a lithium battery, and the tester also includes a charging management circuit. During the test, the main control unit controls the component under test to charge the lithium battery through the test circuit, thereby realizing the reuse of the test circuit and the charging circuit.

10. The double-glass IV tester according to claim 1, characterized in that, It also includes a high-voltage isolation protection circuit, wherein the isolation voltage of the high-voltage isolation protection circuit is not less than 4000V.

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