A test system for power modules

Abstract

This invention provides a power module testing system that may include: an excitation power supply, an adapter module, an electronic load, and a host computer. The adapter module has an opening on its protective housing that is adapted to the size of the power module, through which the power module is inserted into a first receiving space. An interface circuit board is located at one end of the first receiving space corresponding to the opening. After the power module is inserted into the first receiving space, the output interface of the power module and the input terminal of the interface circuit board are adapted and connected. The input interface of the power module is connected to the output terminal of the excitation power supply, and the output terminal of the interface circuit board is connected to the input terminal of the electronic load. A data acquisition circuit board is located in a second receiving space, with its input terminal connected to the output terminal of the interface circuit board, and its output terminal connected to the host computer. The excitation power supply and the electronic load are each connected to the host computer. This power module testing system is portable and allows for integrated testing in the field.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and more specifically, to a testing system for power modules. Background Technology

[0002] A substation is a location in a power system that transforms voltage and current, and receives and distributes electrical energy. Secondary equipment in a substation, such as relay protection devices and monitoring and control devices, consists of multiple modules, one of which is the power supply module. The power supply module serves as the power input device for the entire system, providing the necessary power to the other modules. The reliable operation of the power supply module directly affects the stability of the secondary equipment and even the entire substation.

[0003] To ensure the normal operation of secondary equipment, existing technologies typically employ power module testing systems to test the power modules and determine their operating status. However, existing testing systems are bulky and inconvenient to carry, making them unsuitable for on-site testing. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a power module testing system. To achieve the above objectives, this invention provides the following technical solution:

[0005] A power module testing system according to a specific embodiment of the present invention includes: an excitation power supply, an adapter module, an electronic load, and a host computer;

[0006] The adapter module includes: a protective housing, a data acquisition circuit board, and an interface circuit board;

[0007] The protective housing has a first accommodating space and a second accommodating space. The protective housing has an opening that matches the size of the power module. The power module is inserted into the first accommodating space through the opening.

[0008] The interface circuit board is disposed at one end of the first accommodating space corresponding to the opening. After the power module is inserted into the first accommodating space, the output interface of the power module and the input terminal of the interface circuit board are adapted and connected. The input interface of the power module is connected to the output terminal of the excitation power supply. The output terminal of the interface circuit board is connected to the input terminal of the electronic load.

[0009] The data acquisition circuit board is disposed in the second accommodating space. The input end of the data acquisition circuit board is connected to the output end of the interface circuit board. The output end of the data acquisition circuit board is connected to the host computer. The projection of the data acquisition circuit board in the first direction coincides with the projection of the power module in the first direction.

[0010] The control terminals of the excitation power supply and the electronic load are respectively connected to the host computer. The host computer is used to adjust the output voltage of the excitation power supply and the resistance of the electronic load based on a preset test strategy, and to receive the voltage and current values ​​sent by the data acquisition circuit board.

[0011] Furthermore, the power module testing system also includes: a digital measuring instrument connected to the host computer, used to measure the voltage and current values ​​at the output terminal of the interface circuit board.

[0012] Furthermore, the protective housing includes: a first housing and a second housing;

[0013] The first housing has the first accommodating space and the opening inside. The first housing and the second housing are detachably connected. When the first housing and the second housing are connected, the second accommodating space is formed.

[0014] Furthermore, a preset number of external connectors are provided on the first housing.

[0015] Furthermore, two slide rails with opposite positions are provided on the side wall inside the first housing. Each slide rail extends from the opening to the interface circuit board. After the power module is inserted along the two slide rails, the output interface of the power module and the input terminal of the interface circuit board are adapted and connected.

[0016] Furthermore, the second housing is made of a transparent insulating material.

[0017] Furthermore, the data acquisition circuit board is equipped with a voltage and current acquisition module and a power supply module. The input terminal of the voltage and current acquisition module is connected to the interface circuit board, and the output terminal of the voltage and current acquisition module is connected to the output terminal of the data acquisition circuit board. The power supply module provides the required power to the voltage and current acquisition module.

[0018] Furthermore, the voltage and current acquisition module includes at least a 5V power supply voltage and current acquisition unit, a 24V power supply voltage and current acquisition unit, and a 110V power supply voltage and current acquisition unit.

[0019] Furthermore, the power supply module provides a 5V operating power supply to the voltage and current acquisition module.

[0020] Furthermore, the protective shell is a cuboid structure with a length not exceeding 25cm, a width not exceeding 15cm, and a height not exceeding 10cm.

[0021] As can be seen from the above technical solution, the power module testing system provided by the present invention can include: an excitation power supply, an adapter module, an electronic load, and a host computer. The adapter module includes: a protective housing, a data acquisition circuit board, and an interface circuit board. The protective housing has a first accommodating space and a second accommodating space, and an opening adapted to the size of the power module. The power module is inserted into the first accommodating space through the opening. The interface circuit board is located at one end of the first accommodating space corresponding to the opening. After the power module is inserted into the first accommodating space, the output interface of the power module and the input end of the interface circuit board are adapted and connected. The input interface of the power module is connected to the output end of the excitation power supply, and the output end of the interface circuit board is connected to the input end of the electronic load. The data acquisition circuit board is located in the second accommodating space. The input end of the data acquisition circuit board is connected to the output end of the interface circuit board, and the output end of the data acquisition circuit board is connected to the host computer. The projection of the data acquisition circuit board in a first direction coincides with the projection of the power module in the first direction. The adapter module makes the wiring of the power module simpler and faster. The control terminals of the excitation power supply and the electronic load are connected to a host computer. The host computer is used to adjust the output voltage of the excitation power supply and the resistance of the electronic load based on a preset test strategy, and to receive the voltage and current values ​​sent by the data acquisition circuit board. This power supply module test system is portable and can be integrated for testing in the field. Attached Figure Description

[0022] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a structural diagram of a test system for a power module provided according to an exemplary embodiment;

[0024] Figure 2 This is a test schematic diagram of power module parameters provided according to an exemplary embodiment;

[0025] Figure 3 This is a front structural view of an adapter module provided according to an exemplary embodiment;

[0026] Figure 4 This is a reverse structural diagram of an adapter module provided according to an exemplary embodiment;

[0027] Figure 5 This is a structural diagram of the internal slide rail of the device provided according to an exemplary embodiment;

[0028] Figure 6This is a structural diagram of an interface circuit board provided according to an exemplary embodiment;

[0029] Figure 7 This is a circuit diagram of a 5V power supply voltage and current acquisition unit provided according to an exemplary embodiment;

[0030] Figure 8 This is a circuit diagram of a 24V power supply voltage and current acquisition unit provided according to an exemplary embodiment;

[0031] Figure 9 This is a circuit diagram of a 110V power supply voltage and current acquisition unit provided according to an exemplary embodiment;

[0032] Figure 10 This is a circuit diagram of a power supply module provided according to an exemplary embodiment;

[0033] Figure 11 This is a circuit diagram of the output port on a data acquisition circuit board according to an exemplary embodiment. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Reference Figure 1 The embodiment of the present invention shown provides a test system for a power module, which may include: an excitation power supply 3, an adapter module 1, an electronic load 4, and a host computer 5.

[0036] Reference Figure 3 and Figure 4 The adapter module 1 shown includes: a protective housing, a data acquisition circuit board, and an interface circuit board;

[0037] The protective housing has a first accommodating space and a second accommodating space. The protective housing has an opening that matches the size of the power module. The power module 2 is inserted into the first accommodating space through the opening 103.

[0038] The interface circuit board is located at one end of the first accommodating space corresponding to the opening 103. After the power module 2 is inserted into the first accommodating space, the output interface of the power module 2 and the input end of the interface circuit board are adapted and connected. The input interface of the power module 2 is connected to the output end of the excitation power supply 3, and the output end of the interface circuit board is connected to the input end of the electronic load 4.

[0039] The data acquisition circuit board is set in the second accommodating space. The input end of the data acquisition circuit board is connected to the output end of the interface circuit board. The output end of the data acquisition circuit board is connected to the host computer 5. The projection of the data acquisition circuit board in the first direction and the projection of the power module in the first direction coincide.

[0040] The control terminals of the excitation power supply 3 and the electronic load 4 are respectively connected to the host computer 5. The host computer 5 is used to adjust the output voltage of the excitation power supply 3 and the resistance of the electronic load 4 based on the preset test strategy, and to receive the voltage and current values ​​sent by the data acquisition circuit board.

[0041] Specifically, the programmable excitation power supply 3 can be programmed by the host computer 5 to generate a power supply test quantity sequence, which is then input into the power supply module. The programmable electronic load 4, based on the host computer's programmed settings, can generate a circuit load sequence to simulate the actual working environment of the power supply module 2. To adapt to the output interfaces of most manufacturers' power supply modules, the interface circuit board can use universal power interface terminals for connection with the power supply module. The host computer can control the output quantities of the excitation power supply and electronic load according to the pre-set test program. Then, based on the current and voltage values ​​collected by the data acquisition module, it measures and calculates the parameters corresponding to the program, thereby enabling the analysis and comparison of the power supply module's performance indicators. (Refer to...) Figure 2 The diagram shown is a simplified schematic of the connection and testing of a programmable excitation power supply and a programmable electronic load. R1, R2, R3, R4, and R5 are adjustable resistors; A1, A2, A3, A4, and A5 are ammeters; V1, V2, V3, V4, and V5 are voltmeters; and S1 and S2 are switches. When testing the substation power supply module, the adjustable resistors are replaced with a programmable electronic load, and the ammeters and voltmeters are replaced with digital test instruments. The tests that can be performed using this power supply module testing system include:

[0042] Power module startup voltage test:

[0043] To verify whether the power module can start normally and whether the waveform is monotonous during voltage startup, testers need to adjust the rated operating voltage of the programmable excitation power supply under no-load, half-load, and full-load conditions, and use digital measuring instruments to monitor the monotonicity of the startup voltage, startup time, and voltage amplitude after startup. The power module should meet the technical requirement of reliable startup from 0% rated load to 100% rated load, before the input voltage slowly rises from 0 to 80% of the rated voltage.

[0044] Power module input limit voltage test:

[0045] To verify whether the waveform of the power module is monotonous during voltage startup under extreme voltage input conditions, and whether the power module can start normally, testers need to adjust the electronic load to output no-load, half-load, and full-load conditions respectively, and set the minimum and maximum operating voltages of the programmable excitation power supply. Digital measuring instruments should be used to monitor the monotonicity of the startup voltage, startup time, and voltage amplitude after startup. The power module should meet the technical requirement of reliable startup within the range of 0% to 100% rated load and 70% to 120% of rated voltage.

[0046] Power module repeated startup test:

[0047] To verify the normality of repeated power-on / off startup of the power supply module, testers need to adjust the rated operating voltage of the programmable power supply output under rated load conditions and repeatedly power off and on 5 times, with a 10-second interval between each cycle. The power supply module should meet the following two technical requirements: 1. Under rated load conditions, the stable settling time when the output voltage rises from 10% to 95% of the rated voltage should not exceed 35ms. 2. Under rated load and rated input voltage conditions, the power-on inrush current should not exceed 20A, and the time for the inrush current to drop to 1.5 times the rated input current should not exceed 10ms.

[0048] Power module output accuracy:

[0049] To verify the proper functioning of the power supply loop and output rectifier / filter circuit, testers must adjust the rated operating voltage of the programmable power supply output under rated load conditions and use a digital measuring instrument to measure the output voltage in volts. The power supply module should meet the following technical requirements:

[0050]

[0051] The rated voltage corresponds to different voltage levels of the power supply module, and the reference error is expressed as the ratio of the voltage amplitude at the high-precision test output terminal to the operating voltage of the programmable excitation power supply input power supply module.

[0052] Overall regulation of the power module:

[0053] To verify the stability and response speed of the power supply loop, and to confirm its normal operation, testers must, under rated load, adjust the excitation voltage from 80% to 120% of its rated voltage, using digital measuring instruments to capture the highest point and duration of the voltage jump. Then, adjust the excitation voltage from 120% to 80% of its rated voltage, using digital measuring instruments to capture the lowest point and duration of the voltage jump, and take the greater of the two values. The power module should meet the following technical requirements regarding the overall regulation rate (the ratio of the power module's output voltage to its rated voltage) and its correspondence with different rated voltage levels when the input voltage varies from 80% to 120% of the rated voltage and the load power varies from 10% to 100% of the rated power:

[0054]

[0055] Ripple noise:

[0056] To verify the functionality of the power module's output filter circuit, the excitation power supply input voltage should be varied within 80% to 120% of its rated voltage, and the power supply load current should be varied within 10% to 100% of its rated current. The output voltage ripple noise should be tested using a digital measuring instrument probe with a minimum loop. The power module should meet the following technical requirements:

[0057]

[0058] Among them, the peak-to-peak value of the ripple represents the ratio of the peak amplitude of the ripple to the peak voltage.

[0059] Overvoltage protection for power modules:

[0060] To verify the overvoltage protection function of the power supply, under rated input and rated load conditions, adjust the output voltage of each power module to exceed the rated value by ±20%. The power module must meet the technical requirements that the power protection should stop the power module within 5ms, and the time for the output voltage to drop to 20% of the rated voltage should not exceed 100ms.

[0061] Over-power protection for power modules:

[0062] To verify the overcurrent protection function of the power supply, the output should be adjusted from the rated load to twice the rated load at the rated input. The power supply module must meet the following technical requirements: the power protection should activate and stop the power supply module within 5ms; the time for the output voltage to drop to 20% of the rated voltage should not exceed 100ms.

[0063] Power module short circuit protection:

[0064] To verify the short-circuit protection function of the power supply, the tester needs to short-circuit each output terminal at the rated input of the power supply. The power module must meet the technical requirements of power protection action, stopping the power module within 5ms, and the time for the output voltage to drop to 20% of the rated voltage should not exceed 100ms.

[0065] To verify whether the power supply efficiency is within the normal range, it is necessary to read the source voltage and current, and the electronic load voltage and current, under the rated input and rated output conditions, and calculate the overall efficiency. The technical requirement is: with the power module inputting its rated voltage and at 50% of its rated load, the power supply efficiency should not be less than 70%.

[0066] The power module testing system uses a host computer as the control center. Through built-in test strategies and programs, it can automatically control the excitation power supply and electronic load to automatically measure the power module parameters and record data. It can also automatically judge the module's operating condition and provide subsequent maintenance suggestions, which improves the safety and convenience of testing, reduces the difficulty and complexity of wiring, and can significantly improve the testing efficiency of power modules.

[0067] As a possible implementation method of the above embodiments, see below. Figures 3 to 5 As shown, the protective housing can be composed of a first housing 102 and a second housing 101. A first receiving space and an opening 103 are provided within the first housing 102. The first housing 102 and the second housing 101 are detachably connected via a fixing post 104, forming a second receiving space after the first housing 102 and the second housing 101 are connected. A data acquisition circuit board can be placed in the second receiving space formed by the first housing 102 and the second housing 101. In actual use, the power modules of the secondary equipment supply power to other modules of the secondary equipment in a plug-in manner; therefore, referring to... Figure 3 As shown, depending on the installation method of the power module board, two opposing slide rails 107 are provided on the side wall inside the first housing 102. Each slide rail 107 extends from the opening 103 to the interface circuit board 106. After the power module is inserted along the two slide rails 107, the output interface of the power module and the input terminal of the interface circuit board 106 are adapted and connected. In this way, the slide rails 107 enable the output interface of the power module to dock more smoothly with the interface circuit board 106 located inside the first receiving space, improving the accuracy of docking.

[0068] Most power modules use Phoenix connectors for easy connection. Therefore, to ensure compatibility with most power modules during testing, the interface circuit board can use a power interface compatible with Phoenix connectors. Refer to [reference needed]. Figure 6The interface shown typically uses a 96-terminal connector to interface with the power module, which can meet the access requirements of most power modules. In practical use, the host computer can connect to the output port of the data acquisition circuit board through the pre-reserved notch on the second housing, and connect to the power supply via the exposed power interface of the power module to obtain the various supply current and voltage values ​​of the power module in the power-on state. This power module adapter provides input / output interfaces, including a unified and universal output interface for connecting to test instruments and databases. It effectively solves the safety issues associated with manual plug-and-play testing methods and eliminates the complex wiring process, making the acquisition of power module current, voltage, and other parameters simpler and faster, effectively improving testing efficiency.

[0069] In some specific embodiments of the present invention, a predetermined number of external connectors 105 are provided on the first housing. The external connectors 105 can be used to connect to other interfaces on the power module, facilitating the testing and verification of other functions of the power module.

[0070] For ease of observation and troubleshooting, the second housing 101 is typically made of transparent insulating material. This allows users to directly observe the internal structure of the data acquisition circuit board, enabling timely replacement and repair of the circuit board in conjunction with the mounting posts when problems occur.

[0071] To facilitate testing and carrying, in some other specific embodiments of the present invention, the protective shell is a cuboid structure with a length not exceeding 25cm, a width not exceeding 15cm, and a height not exceeding 10cm.

[0072] It is understood that those skilled in the art can make adaptive adjustments to the overall size and shape of the protective housing according to the actual test power module model, size, etc., and the present invention does not impose any limitations on this.

[0073] As a feasible implementation of the above embodiments, a voltage and current acquisition module and a power supply module are provided on the data acquisition circuit board. The input terminal of the voltage and current acquisition module is connected to the interface circuit board, the output terminal of the voltage and current acquisition module is connected to the output terminal of the data acquisition circuit board, and the power supply module provides the required power to the voltage and current acquisition module.

[0074] The voltage and current acquisition module includes at least three voltage and current acquisition units: one for 5V power supply, one for 24V power supply, and one for 110V power supply. The power supply module provides a 5V operating power supply to the voltage and current acquisition module.

[0075] Specifically, refer to Figures 6 to 11As shown, the interface circuit board uses a 96-pin power interface board, which can send various types of voltage and current output by the power module to the corresponding acquisition circuits for voltage and current signal acquisition. Then, the acquired current and voltage signals are sent to the host computer for processing through the output port of the data acquisition circuit board.

[0076] The voltage and current acquisition unit for the 5V power supply uses the AD8807ARZ operational amplifier as the main chip to process the input 5V power supply and obtain the corresponding 5V power supply current value. The voltage value of the 5V power supply can be directly output to the corresponding output interface after being connected from the interface circuit board.

[0077] The voltage and current acquisition unit of the 24V power supply also uses the AD8807ARZ operational amplifier as the main chip to process the input 24V power supply to obtain the corresponding 24V power supply current value. The 24V power supply voltage value is obtained by voltage division through R6 and R7, and then filtered by capacitor C6 to obtain the corresponding voltage value and send it to the corresponding pin of the output port.

[0078] The voltage acquisition section of the 110V power supply voltage and current acquisition unit uses an isolator AMC1311DWVR and an operational amplifier TLV8001DCKR as the main chips to first isolate and ensure the safety of the voltage before acquiring the voltage, and then send the acquired voltage value to the corresponding pin of the output port.

[0079] The current acquisition section uses an isolator AMC1302QDWVQ1 and an operational amplifier TLV6001DCKR as the main chips. After isolating to ensure the safety of the voltage, the current is acquired and the acquired current value is sent to the corresponding pin of the output port.

[0080] The chips in each unit are powered by a stable 5V voltage provided by an L78M05ABDT-TR voltage regulator chip.

[0081] It is understood that those skilled in the art can also use other circuits with the same voltage and current acquisition functions to acquire voltage and current, and this invention does not impose any limitations on this.

[0082] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The modules and sub-modules in the devices and terminals of the various embodiments of the present invention can be merged, divided, and deleted according to actual needs, and the features described in each embodiment can be replaced or combined.

[0083] In the embodiments provided by this invention, it should be understood that the disclosed terminals and devices can be implemented in other ways. For example, the division of modules or sub-modules is merely a logical functional division; in actual implementation, there may be other division methods. For instance, multiple sub-modules or modules may be combined or integrated into another module, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be indirect couplings or communication connections through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0084] The modules or submodules described as separate components may or may not be physically separate. The components that constitute a module or submodule may or may not be physical modules or submodules; that is, they may be located in one place or distributed across multiple network modules or submodules. Some or all of the modules or submodules can be selected to achieve the purpose of this embodiment's solution, depending on actual needs.

[0085] In addition, the functional modules or sub-modules in the various embodiments of the present invention can be integrated into one processing module, or each module or sub-module can exist physically separately, or two or more modules or sub-modules can be integrated into one module.

[0086] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A testing system for a power supply module, characterized in that, include: Excitation power supply, adapter module, electronic load, and host computer; The adapter module includes: a protective housing, a data acquisition circuit board, and an interface circuit board; The protective housing has a first accommodating space and a second accommodating space. The protective housing has an opening that matches the size of the power module. The power module is inserted into the first accommodating space through the opening. The protective housing includes a first housing and a second housing. The first housing has the first accommodating space and the opening. The first housing and the second housing are detachably connected by a fixing post. The connection of the first housing and the second housing forms the second accommodating space. The interface circuit board is disposed at one end of the first accommodating space corresponding to the opening. After the power module is inserted into the first accommodating space, the output interface of the power module and the input terminal of the interface circuit board are adapted and connected. The input interface of the power module is connected to the output terminal of the excitation power supply. The output terminal of the interface circuit board is connected to the input terminal of the electronic load. Two slide rails with opposite positions are provided on the side wall inside the first housing. Each slide rail extends from the opening to the interface circuit board. After the power module is inserted along the two slide rails, the output interface of the power module and the input terminal of the interface circuit board are adapted and connected. The data acquisition circuit board is disposed in the second accommodating space. The input end of the data acquisition circuit board is connected to the output end of the interface circuit board. The output end of the data acquisition circuit board is connected to the host computer. The projection of the data acquisition circuit board in the first direction and the projection of the power module in the first direction coincide. The voltage and current acquisition module in the data acquisition circuit board includes at least a 5V power supply voltage and current acquisition unit, a 24V power supply voltage and current acquisition unit and a 110V power supply voltage and current acquisition unit. The 110V power supply voltage and current acquisition unit is isolated before acquisition. The control terminals of the excitation power supply and the electronic load are respectively connected to the host computer. The host computer is used to adjust the output voltage of the excitation power supply and the resistance of the electronic load based on a preset test strategy, and to receive the voltage and current values ​​sent by the data acquisition circuit board; and to perform tests by adjusting the electronic load under no-load, half-load and full-load conditions.

2. The system according to claim 1, characterized in that, Also includes: A digital measuring instrument connected to the host computer is used to measure the voltage and current values ​​at the output terminal of the interface circuit board.

3. The system according to claim 1, characterized in that, The first housing is provided with a preset number of external sockets.

4. The system according to claim 1, characterized in that, The second housing is made of a transparent insulating material.

5. The system according to claim 1, characterized in that, The data acquisition circuit board is equipped with a voltage and current acquisition module and a power supply module. The input terminal of the voltage and current acquisition module is connected to the interface circuit board, and the output terminal of the voltage and current acquisition module is connected to the output terminal of the data acquisition circuit board. The power supply module provides the required power to the voltage and current acquisition module.

6. The system according to claim 5, characterized in that, The voltage and current acquisition module includes at least a 5V power supply voltage and current acquisition unit, a 24V power supply voltage and current acquisition unit, and a 110V power supply voltage and current acquisition unit.

7. The system according to claim 5, characterized in that, The power supply module provides a 5V operating power to the voltage and current acquisition module.

8. The system according to any one of claims 1 to 7, characterized in that, The protective shell is a cuboid structure with a length not exceeding 25cm, a width not exceeding 15cm, and a height not exceeding 10cm.

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