Direct current load test system and direct current load test method

Abstract

The invention provides a direct-current load test system, a direct-current load test method and a programmable direct-current load module, and the system comprises an upper computer which is used for storing load simulation parameters required by the direct-current load test of a current tested power supply device, and generating a load simulation control instruction according to the load simulation parameters; and the plurality of programmable direct current load modules are connected with the upper computer and are used for constructing a direct current load simulation network matched with the tested power supply equipment according to the load simulation control instruction so as to perform a direct current load test on the tested power supply equipment. Therefore, through the load simulation parameters stored in the upper computer, the load simulation control instructions suitable for the tested power supply devices with different voltages and power levels can be generated. Besides, a plurality of programmable direct-current load modules are adopted, and a relay group, a main controller, a resistor matrix and the like are integrated in each module, so that the flexibility and the expandability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the field of circuit design technology, and in particular to a DC load test system, a DC load test method, and a programmable DC load module. Background Art

[0002] With the continuous advancement of new energy technologies and the ongoing innovation of "source-grid-load-storage" integration, research and simulation testing of DC loads are becoming increasingly frequent. These include diverse targets such as electric vehicle power batteries, electrochemical energy storage batteries, various electrical devices in DC distribution networks, and DC electric heaters. Given the wide variety of DC loads, their varying voltages and power levels, and their complex and varied cascading configurations, simulation testing requires a large number of DC load test equipment with varying models, types, and technical parameters to simulate diverse load conditions. This allows for comprehensive stress and load testing of power supplies and power supply systems, verifying their performance and stability and ensuring stable operation and high efficiency.

[0003] This test model has been widely used in many industries such as automotive electronics, aerospace, shipbuilding, solar cells, fuel cells, etc., but it is accompanied by many challenges such as high investment costs, lengthy production cycles, insufficient flexibility in use, repeated investment of resources, difficulty in upgrading, poor interoperability between devices, and inconvenient transportation.

[0004] For power supply equipment such as charging stations, inverters, and converters, calibration testing and functional verification are equally important. A DC load must be configured to simulate the DC load for detailed performance and functional verification. Given the significant differences in voltage and power levels among various power supply devices, the required DC load specifications and forms also vary to simulate the various DC loads connecting to or disconnecting from the DC power distribution system. When multiple load devices are required to be used in parallel, they are limited to devices of the same model and must be connected via input and communication cables. These devices then communicate with the upper control terminal for control and data exchange. Summary of the Invention

[0005] In order to solve or alleviate the above technical problems, the present invention provides a DC load test system, a DC load test method, and a programmable DC load module.

[0006] A DC load test system, comprising: The host computer is used to store load simulation parameters required for performing a DC load test on the current power supply device under test, and to generate load simulation control instructions according to the load simulation parameters, wherein the load simulation parameters include at least one of a DC load parameter, a DC load curve, and an energy loading time parameter; A plurality of programmable DC load modules are connected to the host computer and are used to construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction to perform a DC load test on the power supply device under test; Each of the programmable DC load modules includes: an input interface, a relay group, a main controller, and a resistor matrix, wherein the input interface and the relay group are both connected to the main controller; The input interface includes an input interface positive electrode and an input interface negative electrode, the input interface positive electrode is electrically connected to the positive electrode of the DC output port of the power supply device under test, and the input interface negative electrode is electrically connected to the negative electrode of the DC output port of the power supply device under test, and is used to receive the DC power output by the power supply device under test; The main controller is used to parse the load simulation control instruction to generate a switch signal sequence; The resistor matrix includes an input end, an output end, and a plurality of resistor branches formed between the input end and the output end, wherein the input end is electrically connected to the positive electrode of the input interface, and the output end is electrically connected to the input interface to load the DC power onto the resistor matrix; The relay group includes a plurality of relays. Driven by the switching signal sequence, the plurality of relays are selectively connected or disconnected to form a plurality of resistance branches and thereby form a DC load simulation sub-network that consumes the DC power, so that some or all of the corresponding DC load simulation sub-networks in the plurality of programmable DC load modules are combined to form a DC load simulation network.

[0007] Optionally, the main controller includes an FPGA logic control submodule, and the FPGA logic control submodule is used to perform the following steps: parsing the load simulation control instruction to obtain the load simulation parameters therefrom; Based on the configured strategy generator, the logic gate circuit is controlled according to the load simulation parameters to generate a switching signal sequence.

[0008] Optionally, the DC load test system also includes a relay group drive circuit, which is connected to the I / O pin of the FPGA logic control submodule to receive the switching signal sequence output by the FPGA logic control submodule and drive the attraction or release of several relays accordingly to control the several relays to be selectively connected or disconnected.

[0009] Optionally, the FPGA logic control submodule controls the logic gate circuit according to the load simulation parameters based on the configured strategy generator to generate a switching signal sequence, obtains a description file describing the load simulation request, and encodes the description file of the load simulation request to generate a hardware description vector to be loaded into the strategy generator, and accordingly configures the combinational logic and timing logic of the logic gate circuit according to the load simulation parameters to generate a switching signal sequence.

[0010] Optionally, the main controller is also used to obtain the rated output description file of the power supply device under test and the simulated load type description file to determine the connection mode that can be used when the DC load simulation sub-networks are combined, and the connection mode includes: at least one of a single connection mode and a mixed connection mode, the single connection mode is a series connection mode or a parallel connection mode, and the mixed connection mode includes a series connection mode and a parallel connection mode.

[0011] Optionally, the main controller is specifically configured to perform the following steps to determine a connection mode that can be used when the DC load simulation sub-networks are combined: Read and parse the rated output description file of the power supply device under test to obtain the rated voltage V Rated and rated current I Rated; Read and parse the simulated load type description file to obtain the required load resistance range R Load Range; Calculate the total resistance required based on the rated output of the power supply device. : ; According to the resistor strap list R_list, based on the required load resistance range R Load Range, the number of available resistor straps and the total resistance value are evaluated; If the number of resistors and the total resistance value relationship satisfaction , and the number of resistance bands ≤, then the series connection mode is selected; If the resistance value of a single resistor strip is satisfy , then the parallel connection mode is selected; If the number of resistor bands and the total resistance value satisfy And the number of resistance bands ≤, then the mixed connection mode is selected.

[0012] Optionally, the resistor matrix includes a plurality of resistor strips, each resistor strip being connected to at least one relay; The main controller parses the load simulation control instruction to calculate the total resistance value of the DC load simulation network, calculates the number of the DC load simulation sub-networks and the resistance value of each DC load simulation sub-network based on the total resistance value, selectively connects or disconnects the relay so that the resistance band connected to the relay is selectively connected or disconnected, thereby forming at least one corresponding resistance branch.

[0013] Optionally, the DC load test system further includes: a wireless communication module, configured to receive the load simulation control instruction via a constructed wireless communication channel.

[0014] Optionally, the DC load test system further comprises: a fan module for performing air-cooling treatment on the hollow core of the programmable DC load module, and configuring the start-up fan in the fan module and adjusting the fan speed under the control of the main controller.

[0015] Optionally, the DC load test system also includes: a temperature control sensor and a temperature control switch, wherein the temperature control sensor is used to detect the ambient temperature of the programmable DC load module under the control of the temperature control switch, and send it to the main controller, so that when the ambient temperature exceeds a set temperature threshold, the main controller is triggered to send a fan start signal to the fan module, so that the fan module is started, or when the ambient temperature does not exceed the set temperature threshold, the main controller is triggered to send a fan stop signal to the fan module, so that the fan module is stopped.

[0016] A method for a DC load test, comprising: Based on the host computer, storing load simulation parameters required for performing a DC load test on the current power supply device under test, and generating load simulation control instructions according to the load simulation parameters, wherein the load simulation parameters include at least one of a DC load parameter, a DC load curve, and an electric energy loading time parameter; Based on a plurality of programmable DC load modules connected to the host computer, the following steps are performed to construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction, so as to perform a DC load test on the power supply device under test, wherein each of the programmable DC load modules includes: an input interface, a relay group, a main controller, and a resistor matrix, and the input interface and the relay group are both connected to the main controller: Receiving DC power output by the power supply device under test based on an input interface positive electrode and an input interface negative electrode respectively electrically connected to the positive electrode of the DC output port of the power supply device under test and the negative electrode of the DC output port of the power supply device under test; parsing the load simulation control instruction based on the main controller to generate a switch signal sequence; Based on the input end being electrically connected to the positive electrode of the input interface, the output end being electrically connected to the input interface, and the resistance matrix of a plurality of resistance branches formed between the input end and the output end receiving the DC power loaded thereon; Driven by the switching signal sequence, several relays included in the relay group are selectively connected or disconnected to form several resistance branches, thereby forming a DC load simulation sub-network that consumes the DC power, so that some or all of the corresponding DC load simulation sub-networks in the several programmable DC load modules are combined to form a DC load simulation network.

[0017] A DC load test system, comprising: The host computer is used to generate load simulation control instructions according to the load simulation parameters required for performing a DC load test on the current power supply device under test; The programmable DC resistance load network includes a plurality of programmable DC load modules, each of which is connected to the host computer so that the plurality of programmable DC load modules construct a DC load simulation network matching the power supply device under test according to the load simulation control instructions to perform a DC load test on the power supply device under test.

[0018] A programmable DC load module comprises: an input interface, a relay group, a main controller, and a resistor matrix, wherein the input interface and the relay group are both connected to the main controller; The input interface includes an input interface positive electrode and an input interface negative electrode, the input interface positive electrode is electrically connected to the positive electrode of the DC output port of the power supply device under test, and the input interface negative electrode is electrically connected to the negative electrode of the DC output port of the power supply device under test, and is used to receive the DC power output by the power supply device under test; The main controller is used to parse the load simulation control instruction to generate a switch signal sequence; The resistor matrix includes an input end, an output end, and a plurality of resistor branches formed between the input end and the output end, wherein the input end is electrically connected to the positive electrode of the input interface, and the output end is electrically connected to the input interface to load the DC power onto the resistor matrix; The relay group includes a plurality of relays. Driven by the switch signal sequence, the plurality of relays are selectively connected or disconnected to form a plurality of resistance branches and thereby form a DC load simulation sub-network that consumes the DC power, so as to perform a DC load test on the power supply device under test.

[0019] To this end, the DC load test system proposed above effectively solves the technical defects existing in traditional test methods, which is specifically reflected in the following aspects: (1) The system can generate load simulation control instructions suitable for different voltage and power levels of the power supply equipment under test through the load simulation parameters stored in the host computer. This means that whether it is a charging pile, inverter or converter, as long as its DC output characteristics are within the coverage range of the system, it can be accurately simulated and tested by adjusting the load simulation parameters.

[0020] (2) The system uses several programmable DC load modules, each of which integrates key components such as the input interface, relay group, main controller, and resistor matrix. This modular design not only improves the flexibility and scalability of the system, but also enables the system to flexibly adjust load characteristics to simulate various complex DC load conditions.

[0021] (3) While traditional methods limit the parallel use of multiple load devices to devices of the same model, the programmable DC load modules in this system, through unified control by the host computer, can achieve flexible combinations of modules of different models and specifications. This means that when higher power or more complex load simulation is required, multiple modules can be easily connected in parallel to form a DC load simulation network that meets the requirements.

[0022] (4) The system uses wireless (or optional wired) communication to achieve data transmission and control between the host computer and the programmable DC load module, reducing the complex cable connections in traditional methods. This not only improves the portability and deployment convenience of the system, but also reduces the risk of test interruption due to cable failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present disclosure will be more fully understood based on the detailed description given below and the accompanying drawings of embodiments of the present disclosure. The accompanying drawings are intended to provide knowledge and understanding of the embodiments of the present disclosure and are not intended to limit the scope of the present disclosure to these specific embodiments. In addition, the drawings are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of a DC load test system provided in an embodiment of the present application.

[0025] Figure 2 This is a structural diagram of the programmable DC load module 1 provided in an embodiment of the present application.

[0026] FIG3( a ), FIG3 ( b ), and FIG3 ( c ) are schematic diagrams showing a DC load simulation subnetwork formed by the programmable DC load module 1 in a series connection mode, a parallel connection mode, and a mixed connection mode, respectively. Figure 4 A schematic diagram of the structure of the resistance matrix provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following detailed description, drawings, accompanying figures, and appended claims all indicate the nature and advantages of the innovations, embodiments, and / or examples of the claimed inventions. All drawings are for illustrative purposes only and do not limit the scope of the claimed inventions. Such drawings are not necessarily drawn to scale and are a part of this disclosure.

[0028] In the drawings, similar components or features may have the same or similar reference designations in the form of labels (such as alphanumeric symbols, eg, reference numbers) and may indicate similar or equivalent functionality.

[0029] Figure 1 This is a schematic diagram of a DC load test system provided in an embodiment of the present application. Figure 1 As shown, it includes: The host computer 2 is used to store load simulation parameters required for performing a DC load test on the current power supply device under test, and to generate load simulation control instructions according to the load simulation parameters, wherein the load simulation parameters include at least one of a DC load parameter, a DC load curve, and an energy loading time parameter; Several programmable DC load modules 1 are connected to the host computer 2 and are used to construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction to perform a DC load test on the power supply device under test.

[0030] Figure 2 This is a schematic diagram of the structure of the programmable DC load module 1 provided in the embodiment of the present application. Figure 2 As shown, each of the programmable DC load modules 1 includes: an input interface, a relay group 106, a main controller, and a resistance matrix. The input interface and the relay group 106 are both connected to the main controller 103; The input interface includes an input interface positive electrode 101 and an input interface negative electrode 102, wherein the input interface positive electrode 101 is electrically connected to the positive electrode of the DC output port of the power supply device under test, and the input interface negative electrode 102 is electrically connected to the negative electrode of the DC output port of the power supply device under test, and is used to receive the DC power output by the power supply device under test; The main controller 103 is used to parse the load simulation control instruction to generate a switch signal sequence; The resistor matrix 105 includes an input end, an output end, and a plurality of resistor branches formed between the input end and the output end. The input end is electrically connected to the positive electrode 101 of the input interface, and the output end is electrically connected to the input interface to load the DC power onto the resistor matrix 105. The relay group 106 includes a plurality of relays. Driven by the switching signal sequence, the plurality of relays are selectively connected or disconnected to form a plurality of resistance branches and thereby form a DC load simulation sub-network that consumes the DC power, so that some or all of the corresponding DC load simulation sub-networks in the plurality of programmable DC load modules 1 are combined to form a DC load simulation network.

[0031] The switch signal sequence consists of a series of high and low level signals, each corresponding to a relay. When a signal is high, it indicates that the corresponding relay should be connected; when the signal is low, it indicates that the corresponding relay should be disconnected.

[0032] Furthermore, each signal in the switching signal sequence should correspond to a relay in the relay group. The signal's high or low state is determined by the desired resistor branch configuration. The sequence timing should match the resistor branch formation and switching requirements to ensure that the relays are connected or disconnected at the correct time.

[0033] To this end, the DC load test system proposed above effectively solves the technical defects existing in traditional test methods, which is specifically reflected in the following aspects: 1. The system uses the load simulation parameters stored in host computer 2 to generate load simulation control instructions suitable for the power supply devices under test at different voltages and power levels. This means that whether it's a charging station, inverter, or converter, as long as its DC output characteristics fall within the system's coverage, it can be accurately simulated and tested by adjusting the load simulation parameters.

[0034] 2. The system utilizes several programmable DC load modules 1, each of which integrates key components such as an input interface, relay group 106, main controller, and resistor matrix. This modular design not only enhances system flexibility and scalability but also enables flexible adjustment of load characteristics to simulate a variety of complex DC load conditions.

[0035] 3. While traditional methods limit the parallel use of multiple load devices to devices of the same model, the programmable DC load module 1 in this system, under the unified control of the host computer 2, allows for flexible combinations of modules of different models and specifications. This means that when higher power or more complex load simulation is required, multiple modules can be easily connected in parallel to form a DC load simulation network that meets the requirements.

[0036] 4. The system uses wireless or optional wired communication to achieve data transmission and control between the host computer 2 and the programmable DC load module 1, eliminating the complex cable connections required in traditional methods. This not only improves the system's portability and deployment convenience, but also reduces the risk of test interruption due to cable failure.

[0037] Optionally, the main controller 103 includes an FPGA logic control submodule, and the FPGA logic control submodule is used to perform the following steps: parsing the load simulation control instruction to obtain the load simulation parameters therefrom; Based on the configured strategy generator, the logic gate circuit is controlled according to the load simulation parameters to generate a switching signal sequence.

[0038] Therefore, the use of FPGA field programmable gate array logic control submodule in the load simulation control system brings many benefits, which can be explained in the following aspects: 1. FPGAs, with their parallel processing capabilities and high clock speeds, enable efficient parsing and processing of load simulation control instructions. They generate switching signal sequences in real time, ensuring load simulation accuracy and response speed, meeting application scenarios requiring high precision and real-time performance.

[0039] 2. The FPGA logic control submodule, through its configured strategy generator, can flexibly adjust the control logic based on different load simulation parameters. This flexibility enables the system to adapt to various load simulation scenarios, allowing functional adjustments and upgrades without hardware changes.

[0040] 3. FPGA integrates complex logic control functions on a single chip, reducing the need for external components and improving system integration and reliability. This reduces the risk of system failure due to external component failure and improves overall system stability and reliability.

[0041] Optionally, the DC load test system also includes a relay group drive circuit, which is connected to the I / O pin of the FPGA logic control submodule to receive the switching signal sequence output by the FPGA logic control submodule and drive the attraction or release of several relays accordingly to control the several relays to be selectively connected or disconnected.

[0042] Therefore, the introduction of relay group drive circuit combined with FPGA logic control submodule in DC load test system brings significant technical benefits, which can be explained in the following aspects: 1. The design of the relay group drive circuit enables the system to control the energization or release of multiple relays, thereby achieving flexible control of multiple loads. This design enhances the scalability of the system, and the number of relays can be increased or decreased as needed to accommodate load tests of varying scales and complexities.

[0043] 2. The FPGA logic control submodule can output precise switching signal sequences, and the relay group drive circuit can accurately control the relay operation based on these signals. This precise control ensures the accuracy and reliability of the load test and improves the quality and credibility of the test results.

[0044] 3. The FPGA's high-speed and parallel processing capabilities enable it to generate switching signal sequences in real time and rapidly control the relay states through the relay group drive circuit. This high efficiency and real-time performance ensures the smooth progress of load testing, reducing test time and resource consumption.

[0045] 4. By combining the FPGA logic control submodule with the relay group drive circuit, complex load control logic can be implemented without the use of additional external components or a more complex control system. This design simplifies the overall system structure, reduces design and manufacturing costs, and improves the system's cost-effectiveness.

[0046] The reconfigurability of the FPGA logic control submodule makes the system easy to maintain and upgrade. Modifying the load test logic or parameters requires simply reprogramming the FPGA, eliminating the need for hardware replacement. The relay group drive circuit, serving as the FPGA's output interface, is also easy to troubleshoot and replace, reducing system maintenance.

[0047] Optionally, the FPGA logic control submodule controls the logic gate circuit according to the load simulation parameters based on the configured strategy generator to generate a switching signal sequence, obtains a description file describing the load simulation request, and encodes the description file of the load simulation request to generate a hardware description vector to be loaded into the strategy generator, and accordingly configures the combinational logic and timing logic of the logic gate circuit according to the load simulation parameters to generate a switching signal sequence.

[0048] To this end, when generating the switching signal sequence, the FPGA logic control submodule obtains the description file of the load simulation request and encodes it to generate a hardware description vector. This vector is then loaded into the strategy generator to configure the combinational logic and sequential logic of the logic gate circuit according to the load simulation parameters. This technical solution brings significant technical benefits, which can be explained in the following aspects: By using description files to define load simulation requests, the system achieves extreme flexibility and configurability. Users can modify description files as needed to implement different load simulation scenarios without modifying the hardware or firmware. The use of hardware description vectors further enhances this flexibility, enabling the FPGA logic control submodule to dynamically configure logic gates based on varying load simulation parameters.

[0049] 2. The introduction of description files simplifies the design and development process of FPGA logic control submodules. Designers can use high-level languages ​​or tools to write description files without having to delve into the underlying hardware details. This reduces design complexity, shortens development cycles, and enables non-hardware experts to participate in the design and configuration of load simulation systems.

[0050] 3. By combining the load simulation request description file with the hardware description vector, the FPGA logic control submodule can more accurately parse and execute load simulation instructions. This reduces system failures caused by instruction parsing errors or improper configuration, and improves system reliability and stability.

[0051] 4. When the load simulation function needs to be changed or expanded, it is only necessary to modify the description file and regenerate the hardware description vector, and then load it into the FPGA logic control submodule. This reduces the difficulty and cost of system maintenance and upgrades, allowing the system to adapt to new load simulation requirements more quickly.

[0052] 5. By dynamically configuring the combinational logic and sequential logic of logic gate circuits, the FPGA logic control submodule can more efficiently utilize hardware resources and optimize performance based on load simulation parameters. This ensures high performance and resource utilization when handling complex load simulation tasks.

[0053] Optionally, the main controller 103 is also used to obtain the rated output description file of the power supply device under test and the simulated load type description file to determine the connection mode that can be used when the DC load simulation sub-networks are combined, and the connection mode includes: at least one of a single connection mode and a mixed connection mode, the single connection mode is a series connection mode or a parallel connection mode, and the mixed connection mode includes a series connection mode and a parallel connection mode.

[0054] As shown in Figures 3(a), 3(b) and 3(c), they are schematic diagrams of the DC load simulation sub-network formed by the programmable DC load module 1 in the series connection mode, parallel connection mode and mixed connection mode, respectively.

[0055] To this end, the main controller 103 obtains the rated output description file of the power supply device under test and the simulated load type description file to determine the connection mode that can be used when combining the DC load simulation sub-networks. This design brings significant technical benefits, which can be specifically explained from the following aspects: 1. The main controller 103 can automatically obtain and process the rated output description file of the power supply device under test and the simulated load type description file, and can determine the appropriate connection mode without manual intervention. This improves the intelligence and automation level of the system, reduces operational complexity, and improves work efficiency.

[0056] 2. By analyzing the rated output description file and the load type description file, the main controller 103 can more accurately determine the connection mode between the DC load simulation sub-networks. This ensures the accuracy and precision of the load simulation and improves the credibility and reliability of the test results.

[0057] 3. The system supports single connection mode, series or parallel connection, and mixed connection mode, a combination of series and parallel connection, providing a variety of connection methods to choose from. This enhances the flexibility and diversity of the system, enabling the system to adapt to the test requirements of different power devices and load types under test.

[0058] 4. The main controller 103 selects the most appropriate connection mode based on the rated output of the power supply device under test and the simulated load type, thereby optimizing resource allocation. This avoids unnecessary resource waste and improves the overall performance and efficiency of the system.

[0059] 5. By automatically determining the connection mode, the system can quickly perform load simulation tests, improving test efficiency. At the same time, due to the precise selection of the connection mode, the quality of the test results is also improved, providing more reliable test data for the R&D and production of power supply equipment.

[0060] Optionally, the main controller 103 is specifically configured to perform the following steps to determine a connection mode that can be used when the DC load simulation sub-networks are combined: Read and parse the rated output description file of the power supply device under test to obtain the rated voltage V Rated and rated current I Rated; Read and parse the simulated load type description file to obtain the required load resistance range R Load Range; Calculate the total resistance required based on the rated output of the power supply device. : ; According to the list R_list of resistor straps 115 , based on the required load resistance range R Load Range , evaluating the number of available resistor straps 115 and the total resistance value; If the number and total resistance value of the resistance band 115 relationship satisfaction , and the number of resistance bands 115 is ≤3, then the series connection mode is selected; If the resistance value of a single resistor strip 115 and satisfy , then the parallel connection mode is selected; If the number and total resistance value of the resistor band 115 satisfy If the number of the resistance bands 115 is ≤ 5, the mixed connection mode is selected.

[0061] Therefore, the selection of the above parameters when combining DC load simulation sub-networks has the following technical benefits: 1. The 5% tolerance is chosen to ensure that the resistance values ​​match closely enough to the desired R Required , taking into account the accuracy and availability of resistor ribbon 115 in real-world applications. This tolerance provides some flexibility to accommodate variations between the actual and ideal values ​​of resistor ribbon 115 , ensuring a precise resistance match and thus improving test accuracy.

[0062] 2. The threshold for the number of resistor ribbons 115 is set at 3 because, when a limited number of resistor ribbons 115 are available, series connection is the simplest implementation and is easy to control and adjust. This threshold facilitates quick decision-making while maintaining system simplicity. When the number of resistor ribbons 115 is small, selecting series connection simplifies circuit design, reduces nodes and connection points, and reduces complexity and potential points of failure.

[0063] 3. 20% is selected as the threshold for the ratio of individual resistor ribbons 115 to R Required to ensure that even with lower resistance values, the required total resistance can be effectively achieved through parallel connection. This ratio provides sufficient margin to accommodate different combinations of resistor ribbons 115, enabling flexible connection patterns based on the actual number and resistance values ​​of resistor ribbons 115, improving system adaptability. Furthermore, parallel connection provides greater current carrying capacity without sacrificing resistance, helping to simulate the performance of power supply devices under high load conditions.

[0064] 4. The threshold value of the number of resistor strips 115 is set to 5 because when a large number of available resistor strips 115 are available, they can be connected in parallel to share the current, reducing the load of a single resistor, thereby improving the stability and reliability of the system.

[0065] Alternatively, illustratively, see Figure 4 The resistor matrix 105 includes a plurality of resistor strips 115, each of which is connected to at least one relay 116. In addition, a connection switch 117 is configured to be connected to the input. When the connection switch is closed, the corresponding resistor matrix may participate in the work. Figure 4 In the scenario, the relay is connected across the two ends of the resistance segment. When the relay is closed, the resistance strip is short-circuited. When the relay is disconnected, the resistance strip can form a resistance branch.

[0066] In some embodiments, multiple Figure 4As shown in the resistor matrix, one resistor matrix is ​​configured with one connection switch, and by controlling the closing or opening of the connection switch, the corresponding resistor matrix is ​​controlled to participate in the processing.

[0067] Here, it should be noted that the control of the above-mentioned connection switches and relays can be controlled by generating high and low level starting signals by the control circuit. The detailed control principle can be found in the relevant description of the prior art and will not be repeated here.

[0068] The main controller parses the load simulation control instruction to calculate the total resistance value of the DC load simulation network, and calculates the number of the DC load simulation sub-networks and the resistance value of each DC load simulation sub-network based on the total resistance value, and selectively connects or disconnects the relay so that the resistance band 115 connected to the relay is selectively connected or disconnected, thereby forming at least one corresponding resistance branch.

[0069] To this end, the resistor matrix 105 is composed of several resistor strips 115, each of which is connected to at least one relay. The main controller parses the load simulation control instructions to calculate the total resistance of the DC load simulation network and, based on this, determines the number of DC load simulation sub-networks and the resistance value of each sub-network. By selectively connecting or disconnecting the relays, the resistor strips 115 connected to the relays are selectively connected or disconnected, thereby forming at least one corresponding resistance branch. This technical solution brings significant technical benefits, which can be specifically explained from the following aspects: 1. By using relays to control the insertion and removal of the resistor strips 115, the system can achieve flexible resistance configuration. The main controller can dynamically adjust the number and resistance value of the resistor branches according to the load simulation control instructions to meet different test requirements.

[0070] 2. The main controller can accurately calculate the total resistance value of the DC load simulation network and accurately determine the number and resistance value of the sub-networks based on this value. This ensures the precision and accuracy of the load simulation and improves the credibility and reliability of the test results.

[0071] 3. By quickly connecting or disconnecting relays, the system can quickly form or change resistance branches, achieving real-time control of load simulation. This improves test efficiency and reduces test time and resource consumption.

[0072] 4. The resistor matrix 105 is composed of a plurality of resistor strips 115. Each resistor strip 115 can be independently controlled, which increases the scalability of the system. When the resistance value needs to be increased or the resistor configuration needs to be changed, only the resistor strip 115 needs to be added or replaced without making major changes to the entire system.

[0073] 5. The resistor matrix 105 composed of relays and resistor strips 115 simplifies the design of the load simulation network. Compared with using complex electronic components or circuits, this design solution reduces manufacturing costs and improves the cost-effectiveness of the system.

[0074] 6. The resistor strip 115 and relay are independent modules, making them easy to troubleshoot and replace. When the system needs to be upgraded or maintained, these modules can be easily replaced or repaired, reducing maintenance difficulty and cost.

[0075] Optionally, the DC load test system further includes: a wireless communication module 104, configured to receive the load simulation control instruction via a constructed wireless communication channel.

[0076] To this end, the DC load test system further includes a wireless communication module 104 for receiving load simulation control instructions via a constructed wireless communication channel. This design brings significant technical benefits, which can be specifically explained from the following aspects: 1. The introduction of wireless communication module 104 makes the transmission of load simulation control instructions no longer restricted by physical connections, thus improving the flexibility of the system. Users can send control instructions wirelessly without touching the DC load test system, thus achieving remote control.

[0077] 2. Using wireless communication eliminates the complex wiring and interface design required for traditional wired connections, simplifying the system layout and installation process. This reduces system deployment costs and improves system maintainability.

[0078] 3. The wireless communication module 104 enables the DC load test system to connect and interact with other devices with wireless communication capabilities. This enhances the scalability of the system and makes it easier to integrate the system into a larger test environment or automated test system.

[0079] 4. Users can send load simulation control commands via wireless communication anytime and anywhere, without having to go to the site in person. This improves the efficiency and convenience of testing, especially when remote testing or large-scale deployment testing scenarios are required.

[0080] 5. Using wireless communication reduces the number of physical connection points and reduces the risk of failures caused by poor connections or aging lines. This helps improve system stability and reliability and reduces test interruptions or data loss due to failures.

[0081] Optionally, the DC load test system further comprises: a fan module 107 for performing hollow air cooling on the programmable DC load module 1 , and configuring the fan to be started and adjusting the fan speed in the fan module 107 under the control of the main controller 103 .

[0082] To this end, the DC load test system also includes a fan module 107, which is used to perform air cooling on the programmable DC load module 1. This module can also configure fan startup and adjust fan speed under the control of the main controller 103. This design brings significant technical benefits, which can be specifically explained in the following aspects: 1. The fan module 107 effectively removes the heat generated by the programmable DC load module 1 through air cooling, improving the system's heat dissipation efficiency. This helps maintain the load module's operating temperature within a reasonable range, preventing performance degradation or damage due to overheating.

[0083] 2. Through effective heat dissipation, the fan module 107 helps lower the operating temperature of the programmable DC load module 1, thereby reducing the damage to electronic components caused by thermal stress. This helps extend the service life of the load module and the entire system, and reduces maintenance costs.

[0084] 3. The introduction of fan module 107 enables the system to better cope with high load or long-term operation, reducing the risk of system crash or failure due to overheating. This improves the stability and reliability of the system and ensures the accuracy and consistency of test results.

[0085] 4. The main controller 103 can control the start-up and speed adjustment of the fan in the fan module 107, allowing users to flexibly configure it according to actual test requirements and environmental conditions. This enhances the flexibility and controllability of the system and improves the user experience.

[0086] Optionally, the DC load test system also includes: a temperature control sensor and a temperature control switch 108, wherein the temperature control sensor is used to detect the ambient temperature of the programmable DC load module 1 under the control of the temperature control switch 108, and send it to the main controller 103, so that when the ambient temperature exceeds a set temperature threshold, the main controller is triggered to send a fan start signal to the fan module 107, so that the fan module 107 is started, or when the ambient temperature does not exceed the set temperature threshold, the main controller is triggered to send a fan stop signal to the fan module 107, so that the fan module 107 is stopped.

[0087] To this end, the DC load test system further includes a temperature control sensor and a temperature control switch 108. This design brings significant technical benefits, which can be specifically explained from the following aspects: 1. Under the control of the temperature control switch 108, the temperature control sensor can detect the ambient temperature of the programmable DC load module 1 in real time and send this data to the main controller 103. Based on the received temperature data, the main controller 103 can intelligently determine whether to start or stop the fan module 107 to achieve precise temperature control management.

[0088] 2. When the ambient temperature exceeds the set temperature threshold, the main controller 103 promptly triggers the fan start signal to ensure that the fan module 107 begins operation, preventing damage to the programmable DC load module 1 due to overheating. This greatly improves system safety and avoids safety hazards such as equipment failure or fire caused by excessive temperatures.

[0089] 3. Through intelligent temperature control management, the system can ensure that the programmable DC load module 1 always operates within a suitable temperature range. This helps reduce the damage to electronic components caused by thermal stress, thereby extending the service life of the equipment.

[0090] 4. When the ambient temperature does not exceed the set temperature threshold, the main controller 103 will trigger the fan stop signal to stop the fan module 107. This avoids unnecessary energy consumption and reduces the operating cost of the system.

[0091] In addition, the present invention also provides a method for a DC load test, which includes: Based on the host computer 2, the load simulation parameters required for performing a DC load test on the current power supply device under test are stored, and a load simulation control instruction is generated according to the load simulation parameters, wherein the load simulation parameters include at least one of a DC load parameter, a DC load curve, and an energy loading time parameter; Based on a plurality of programmable DC load modules 1 connected to the host computer 2, the following steps are performed to construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction, so as to perform a DC load test on the power supply device under test, wherein each programmable DC load module 1 includes: an input interface, a relay group 106, a main controller, and a resistance matrix, and the input interface and the relay group 106 are both connected to the main controller 103: Based on the input interface comprising an input interface positive electrode 101 and an input interface negative electrode 102, which are electrically connected to the positive electrode of the DC output port of the power supply device under test and the negative electrode of the DC output port of the power supply device under test respectively, receiving the DC power output by the power supply device under test; parsing the load simulation control instruction based on the main controller 103 to generate a switching signal sequence; Based on the input end being electrically connected to the positive electrode 101 of the input interface, the output end being electrically connected to the input interface, and the resistance matrix 105 of a plurality of resistance branches formed between the input end and the output end receiving the DC power loaded thereon; Driven by the switching signal sequence, the multiple relays included in the relay group 106 are selectively connected or disconnected to form multiple resistance branches, thereby forming a DC load simulation sub-network that consumes the DC power, so that some or all of the corresponding DC load simulation sub-networks in the multiple programmable DC load modules 1 are combined to form a DC load simulation network.

[0092] Furthermore, the programmable DC resistance load module may further include a power supply 109 for providing power to the above-mentioned electronic control components in the programmable DC resistance load module.

[0093] Furthermore, an embodiment of the present application further provides a DC load test system, which includes: The host computer 2 is used to generate a load simulation control instruction according to the load simulation parameters required for performing a DC load test on the current power supply device under test; A programmable DC resistance load network includes a plurality of programmable DC load modules 1, each of which is connected to the host computer 2, so that the plurality of programmable DC load modules 1 construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction, so as to perform a DC load test on the power supply device under test.

[0094] In this embodiment, each programmable DC load module 1 can refer to the above Figure 2 The embodiment can be implemented in other ways.

[0095] Furthermore, the embodiment of the present application further provides a programmable DC load module 1, which includes: an input interface, a relay group 106, a main controller, and a resistor matrix, wherein the input interface and the relay group 106 are both connected to the main controller 103; The input interface includes an input interface positive electrode 101 and an input interface negative electrode 102, wherein the input interface positive electrode 101 is electrically connected to the positive electrode of the DC output port of the power supply device under test, and the input interface negative electrode 102 is electrically connected to the negative electrode of the DC output port of the power supply device under test, and is used to receive the DC power output by the power supply device under test; The main controller 103 is used to parse the load simulation control instruction to generate a switch signal sequence; The resistor matrix 105 includes an input end, an output end, and a plurality of resistor branches formed between the input end and the output end. The input end is electrically connected to the positive electrode 101 of the input interface, and the output end is electrically connected to the input interface to load the DC power onto the resistor matrix 105. The relay group 106 includes a plurality of relays. Driven by the switching signal sequence, the plurality of relays are selectively connected or disconnected to form a plurality of resistance branches and thereby form a DC load simulation sub-network that consumes the DC power, so as to perform a DC load test on the power supply device under test.

[0096] In this embodiment, the exemplary description of each structure can be found in the above Figure 1-Figure 2 The description will not be repeated here.

[0097] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A DC load test system, characterized in that: include: The host computer (2) is used to store load simulation parameters required for performing a DC load test on the current power supply device under test, and to generate load simulation control instructions according to the load simulation parameters, wherein the load simulation parameters include at least one of a DC load parameter, a DC load curve, and an electric energy loading time parameter; A plurality of programmable DC load modules (1) are connected to the host computer (2) and are used to construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction, so as to perform a DC load test on the power supply device under test; Each of the programmable DC load modules (1) comprises: an input interface, a relay group (106), a main controller (103), and a resistance matrix (105); the input interface and the relay group (106) are both connected to the main controller (103); The input interface comprises an input interface positive electrode (101) and an input interface negative electrode (102), the input interface positive electrode (101) being electrically connected to the positive electrode of the DC output port of the power supply device under test, and the input interface negative electrode (102) being electrically connected to the negative electrode of the DC output port of the power supply device under test, for receiving DC power output by the power supply device under test; The main controller (103) is used to parse the load simulation control instruction to generate a switch signal sequence; The resistor matrix (105) comprises an input end, an output end, and a plurality of resistor branches formed between the input end and the output end, the input end being electrically connected to the positive electrode (101) of the input interface, and the output end being electrically connected to the input interface, so as to load the direct current power onto the resistor matrix (105); The relay group (106) comprises a plurality of relays (116), which are selectively connected or disconnected under the drive of the switch signal sequence to form a plurality of resistance branches and thereby form a DC load simulation sub-network that consumes the DC power, so that some or all of the corresponding DC load simulation sub-networks in the plurality of programmable DC load modules (1) are combined to form a DC load simulation network.

2. The DC load test system according to claim 1, characterized in that: The main controller (103) comprises an FPGA logic control submodule, and the FPGA logic control submodule is used to perform the following steps: Parsing the load simulation control instruction to obtain the load simulation parameter therefrom; Based on the configured strategy generator, the logic gate circuit is controlled according to the load simulation parameters to generate a switch signal sequence.

3. The DC load test system according to claim 2, characterized in that: The DC load test system also includes a relay group drive circuit, which is connected to the I / O pin of the FPGA logic control submodule to receive the switch signal sequence output by the FPGA logic control submodule and drive the attraction or release of several relays accordingly to control the several relays to be selectively connected or disconnected.

4. The DC load test system according to claim 2, characterized in that: The FPGA logic control submodule controls the logic gate circuit according to the load simulation parameters based on the configured strategy generator to generate a switch signal sequence, obtains a description file describing the load simulation request, and encodes the description file of the load simulation request to generate a hardware description vector to be loaded into the strategy generator, thereby configuring the combinational logic and timing logic of the logic gate circuit according to the load simulation parameters to generate a switch signal sequence.

5. The DC load test system according to claim 1, characterized in that: The main controller (103) is also used to obtain a rated output description file of the power supply device under test and a simulated load type description file to determine a connection mode that can be used when the DC load simulation sub-networks are combined, the connection mode comprising: at least one of a single connection mode and a mixed connection mode, the single connection mode being a series connection mode or a parallel connection mode, and the mixed connection mode comprising a series connection mode and a parallel connection mode.

6. The DC load test system according to claim 1, characterized in that: The main controller (103) is specifically used to perform the following steps to determine the connection mode that can be used when the DC load simulation sub-networks are combined: Read and parse the rated output description file of the power supply device under test to obtain the rated voltage V Rated and rated current I Rated ; Read and parse the simulated load type description file to obtain the required load resistance range R Load Range; Calculate the total resistance required based on the rated output of the power supply device. : ; According to the list R_list of resistor straps (115), based on the required load resistance range R Load Range, evaluating the number of available resistor straps (115) and the total resistance value; If the number and total resistance value of the resistor band (115) Relationship satisfaction , and the number of the resistance bands (115) is ≤3, then the series connection mode is selected; If the resistance value of a single resistor strip (115) and total resistance value satisfy , then the parallel connection mode is selected; If the number and total resistance value of the resistor band (115) satisfy And the number of the resistor bands (115) is ≤5, then the mixed connection mode is selected.

7. The DC load test system according to claim 1, characterized in that: The resistor matrix (105) includes a plurality of resistor bands (115), each resistor band (115) being connected to at least one relay; The main controller parses the load simulation control instruction to calculate the total resistance value of the DC load simulation network, calculates the number of the DC load simulation sub-networks and the resistance value of each DC load simulation sub-network based on the total resistance value, and selectively connects or disconnects the relay so that the resistance band (115) connected to the relay is selectively connected or disconnected, thereby forming at least one corresponding resistance branch.

8. A method for DC load testing, characterized in that: include: Based on the host computer (2), load simulation parameters required for performing a DC load test on the current power supply device under test are stored, and load simulation control instructions are generated according to the load simulation parameters, wherein the load simulation parameters include at least one of a DC load parameter, a DC load curve, and an electric energy loading time parameter; Based on connecting a plurality of programmable DC load modules (1) to the host computer (2), the following steps are performed to construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction, so as to perform a DC load test on the power supply device under test, wherein each of the programmable DC load modules (1) comprises: an input interface, a relay group (106), a main controller, and a resistance matrix, and the input interface and the relay group (106) are both connected to the main controller (103): Based on the input interface comprising a positive electrode (101) and a negative electrode (102) electrically connected to the positive electrode of the DC output port of the power supply device under test and the negative electrode of the DC output port of the power supply device under test, respectively, receiving the DC power output by the power supply device under test; Parsing the load simulation control instruction based on the main controller (103) to generate a switch signal sequence; Based on the input end being electrically connected to the positive electrode (101) of the input interface, the output end being electrically connected to the input interface, and a resistance matrix (105) of a plurality of resistance branches formed between the input end and the output end receiving the DC power loaded thereon; Driven by the switch signal sequence, a plurality of relays included in the relay group (106) are selectively connected or disconnected to form a plurality of resistance branches, thereby forming a DC load simulation sub-network that consumes the DC power, so that part or all of the corresponding DC load simulation sub-networks in the plurality of programmable DC load modules (1) are combined to form a DC load simulation network.

9. A DC load test system, characterized in that: include: The host computer (2) is used to generate a load simulation control instruction according to the load simulation parameters required for performing a DC load test on the power supply device under test; A programmable DC resistance load network comprises a plurality of programmable DC load modules (1), each of which is connected to a host computer (2), so that the plurality of programmable DC load modules (1) construct a DC load simulation network matching the power supply device under test according to the load simulation control instruction, so as to perform a DC load test on the power supply device under test.

10. A programmable DC load module, characterized in that: include: An input interface, a relay group (106), a main controller, and a resistance matrix, wherein the input interface and the relay group (106) are both connected to the main controller (103); The input interface comprises an input interface positive electrode (101) and an input interface negative electrode (102), the input interface positive electrode (101) being electrically connected to the positive electrode of the DC output port of the power supply device under test, and the input interface negative electrode (102) being electrically connected to the negative electrode of the DC output port of the power supply device under test, for receiving DC power output by the power supply device under test; The main controller (103) is used to parse the load simulation control instruction to generate a switch signal sequence; The resistor matrix (105) comprises an input end, an output end, and a plurality of resistor branches formed between the input end and the output end, the input end being electrically connected to the positive electrode (101) of the input interface, and the output end being electrically connected to the input interface, so as to load the direct current power onto the resistor matrix (105); The relay group (106) comprises a plurality of relays. Under the drive of the switch signal sequence, the plurality of relays are selectively connected or disconnected to form a plurality of resistance branches and thereby form a DC load simulation sub-network that consumes the DC power, so as to perform a DC load test on the power supply device under test.

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