A Current Durability Test System for a Control and Protection Device on a Charging Cable

Abstract

The present invention discloses a current durability test system for a control and protection device on a charging cable, which includes an input power supply, a device under test, a main control module, a data processing module, a timing control module, a switch switching module, a collection and display module, and a current load module. By precisely controlling the timing in the test process, the timing control module ensures that each test stage is executed in sequence. The switch switching module switches different current loads according to the control signal to implement multiple tests of residual current, pre-charge current, rated current, and pulse current. Each current test signal is collected by a current probe and transmitted to the data processing module. The main control module controls the switch switching module according to the test results to ensure that the system performs the test according to the predetermined process and meets the durability test requirements under different current loads. This system can efficiently and accurately evaluate the durability of charging cables and related equipment, and has the advantages of simple operation, high automation, and high test accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic device testing, and in particular relates to a current durability testing system for a control and protection device on a charging cable. Background Art

[0002] With the rapid development of electric vehicles and other charging equipment, the safety and stability of charging cables, as a key part of power transmission, are of vital importance. The control and protection devices integrated on the charging cables are usually used to protect batteries and other electrical components from electrical faults such as overload, short circuit, overvoltage, etc. However, these control and protection devices may encounter a variety of extreme current or voltage conditions during long-term use, especially in frequent charging cycles. The durability and stability of the current have become the core issues to ensure their reliability.

[0003] In order to ensure the reliability and safety of these devices, they must be subjected to long-term current durability tests. The current durability test methods in the prior art often have the following problems:

[0004] (1) Low test efficiency: Most existing test systems rely on manual operation or semi-automated processes, which have low test efficiency and require a long time to run before conclusions can be drawn. In addition, under the alternating test of multiple current modes, the system's degree of automation is limited, resulting in a long test cycle, which is difficult to meet the needs of efficient production.

[0005] (2) Single test mode: Current test systems are often limited to testing a single current mode (such as rated current, pulse current, etc.), and lack comprehensive testing of the alternating effects of different current modes. Since multiple current fluctuations may occur during the charging process, a single test mode cannot fully evaluate the durability of the control and protection device in a complex current environment.

[0006] (3) Lack of automated fault detection and recovery mechanisms: When a test fails, existing test systems rely on manual intervention to retest, and are unable to automatically diagnose the fault and quickly resume testing. The lack of automated error recovery and retry mechanisms affects test efficiency and accuracy.

[0007] (4) Inconsistent test environment: Charging cables vary greatly in use under different environmental conditions (such as temperature, humidity, voltage fluctuations, etc.). However, existing test systems often fail to simulate the various current loads and current mode changes in real use environments, resulting in inaccurate test results that cannot reflect the performance of the device in actual work.

[0008] Therefore, how to design an efficient, comprehensive and automated current durability test system has become a technical problem that needs to be urgently solved in the current electrical equipment industry. Summary of the invention

[0009] The object of the present invention is to provide a current durability test system for a control and protection device on a charging cable to overcome the defects existing in the above-mentioned prior art.

[0010] The object of the present invention can be achieved by the following technical solutions:

[0011] The present invention provides a current durability test system for a control and protection device on a charging cable, including:

[0012] An input power supply, a device under test, a main control module, a data processing module, a timing control module, a switch switching module, a collection and display module, and a current load module. The input power supply is connected to the device under test. The device under test is connected to the current load module through the collection and display module and the switch switching module. The collection and display module is connected to the data processing module. The data processing module is connected to the main control module. The main control module is respectively connected to the timing control module and the switch switching module.

[0013] Furthermore, the current load module includes a residual current load, a pre-charge current load, a rated current load, and a pulse current load. The current durability test system includes a residual current test, a pre-charge current test, a rated current test, and a pulse current test. The residual current load is used for the residual current test of the device under test. The pre-charge current load is used for the pre-charge current test of the device under test. The rated current load is used for the rated current test of the device under test. The pulse current load is used for the pulse current test of the device under test.

[0014] Furthermore, the collection and display module includes a first current probe, a second current probe, a third current probe, and a fourth current probe. The switch switching module includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch. The input power supply is connected to the device under test through the first switch. The device under test is respectively connected to the residual current load, the pre-charge current load, the rated current load, and the pulse current load through the second switch, the third switch, the fourth switch, and the fifth switch.

[0015] Furthermore, the timing control module includes a timer chip, an adder, a register, a first counter, a second counter, a first decoder, a second decoder, and a third decoder. The first counter is a three-bit counter. The second counter is a two-bit counter. The register is a two-bit register with an initial value of 00.

[0016] Furthermore, the timer chip is connected to the timing signal input port of the main control module and is used to output a clock signal to the main control module every preset period of time.

[0017] Further, the test result output port of the main control module is connected to the first input terminal of the first decoder, and the output terminal of the first counter is connected to the second input terminal of the first decoder through the third decoder; the first output terminal of the first decoder is connected to the input terminal of the adder, the second output terminal of the first decoder is connected to the input terminal of the first counter, the third output terminal of the first decoder is connected to the input terminal of the second counter, the output terminal of the first counter is connected to the first input terminal of the second decoder, the output terminal of the second counter is connected to the second input terminal of the second decoder, the first output terminal of the second decoder is connected to the clear bit of the first counter, the second output terminal of the second decoder is connected to the clear bit of the second counter, the third output terminal of the second decoder is connected to the stop test control port of the main control module, and the output terminal of the adder is respectively connected to the test item input port and the register of the main control module.

[0018] Further, the first decoder is a decoder with two inputs and three outputs. The first input is one output of the test result output terminal of the main control module, the second input is one output of the third decoder, the first output is input to the input terminal of the adder, the second output is input to the input terminal of the first counter, and the third output is input to the input terminal of the second counter. The output rule of the first decoder is as follows:

[0019] When the input is 10, the three outputs of the first decoder are 100;

[0020] When the input is 00, the three outputs of the first decoder are 010;

[0021] When the input is 11, the three outputs of the first decoder are 011;

[0022] When the input is 01, the three outputs of the first decoder are 010.

[0023] Further, the second decoder is a decoder with five inputs and three outputs. The first three inputs are the three outputs of the first counter, and the last two inputs are the two outputs of the second counter. The first output is input to the clear port of the first counter, the second output is input to the clear port of the second counter, and the third output is input to the stop test control port of the main control module. The output rule of the second decoder is as follows:

[0024] When the input is 10011, the output is 110;

[0025] When the input is 10000, the output is 111;

[0026] When the input is 10001, the output is 111;

[0027] When the input is 10010, the output is 111; for other inputs, the output is 000.

[0028] Further, the third decoder is a decoder with three inputs and one output. The three inputs are the three outputs of the first counter, and the one output is input to the second input port of the first decoder. The output rule of the third decoder is as follows:

[0029] When the input is 000, the output is 0; for other inputs, the output is 1.

[0030] Further, the main control module is used to execute the following process:

[0031] When the main control module receives a clock signal from the timing signal input port once, the main control module receives the output of the adder from the test item input port once, and outputs a control signal to the switch switching module according to the received signal to control the corresponding switch to close for testing. Specifically, it includes:

[0032] When the signal received by the test item input port is 00, output a control signal to the switch switching module to control the first switch and the second switch to close, and control the third switch, the fourth switch, and the fifth switch to open, so as to realize the residual current test of the device under test;

[0033] When the signal received by the test item input port is 01, output a control signal to the switch switching module to control the first switch and the third switch to close, and control the second switch, the fourth switch, and the fifth switch to open, so as to realize the pre-charge current test of the device under test;

[0034] When the signal received by the test item input port is 10, output a control signal to the switch switching module to control the first switch and the fourth switch to close, and control the second switch, the third switch, and the fifth switch to open, so as to realize the rated current test of the device under test;

[0035] When the signal received by the test item input port is 11, output a control signal to the switch switching module to control the first switch and the fifth switch to close, and control the second switch, the third switch, and the fourth switch to open, so as to realize the pulse current test of the device under test;

[0036] The main control module receives the test result signal output by the data processing module. When the test is successful, it outputs a 1 signal to the first input port of the first decoder through the test result output port. When the test fails, it outputs a 0 signal to the first input port of the first decoder through the test result output port;

[0037] When the main control module receives a 1 signal from the stop test control port, the test stops.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] (1) By setting up a residual current load, a pre-charge current load, a rated current load, and a pulse current load, the present invention realizes the alternate testing of different current modes (such as residual current, pre-charge current, rated current, and pulse current), and can comprehensively simulate the performance of the charging cable under different working conditions. This setting overcomes the limitation of the single current testing mode in the prior art, enabling the testing system to more accurately evaluate the durability of the control and protection device in a complex current environment.

[0040] (2) By introducing a timing control module and a multi-level decoder structure, the present invention realizes the full-automatic control and monitoring of the testing process. When each test fails, the system can automatically start a retry mechanism, performing up to three retries. Only after ensuring that each test item passes can the next test link be entered. In this way, the automation degree of the test is greatly improved, the need for manual intervention is reduced, and time and labor costs are saved.

[0041] (3) The present invention uses the connection between a timer chip and the main control module to accurately control the time interval of each test stage, ensuring that each step in the testing process can be carried out according to the preset time, and avoiding delays or inconsistencies in the testing process. This precise timing control improves the accuracy of the test results and ensures the stable progress of each test stage.

[0042] (4) The second decoder of the present invention is connected to the stop test control port of the main control module, and can automatically stop the test when a system error is detected, avoiding unnecessary repetition and the influence of errors in the testing process. This mechanism not only improves the stability of the test, but also ensures that the system can stop in time when a failure occurs, preventing further damage or the generation of incorrect data.

[0043] (5) By using the cooperation of a multi-bit counter and a decoder, the present invention can accurately track the test progress and the number of retries in multiple test cycles, ensuring that each test can complete a certain number of retries and switch to the next task in a timely manner according to the test results. The cooperation between the counter and the decoder ensures the efficiency and stability of the testing process. Description of the Drawings

[0044] Figure 1 is a schematic diagram of the system of the present invention;

[0045] Figure 2 is a schematic diagram of the timing control module of the present invention. Detailed Embodiments

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] This embodiment provides a current durability test system for a control and protection device on a charging cable, as Figure 1 shown, including:

[0048] An input power supply, a device under test, a main control module, a data processing module, a timing control module, a switch switching module, a collection and display module, and a current load module. The input power supply is connected to the device under test, the device under test is connected to the current load module through the collection and display module and the switch switching module, the collection and display module is connected to the data processing module, the data processing module is connected to the main control module, and the main control module is respectively connected to the timing control module and the switch switching module.

[0049] Furthermore, the current load module includes a residual current load, a pre-charge current load, a rated current load, and a pulse current load. The current durability test system includes a residual current test, a pre-charge current test, a rated current test, and a pulse current test; the residual current load is used for the residual current test of the device under test, the pre-charge current load is used for the pre-charge current test of the device under test, the rated current load is used for the rated current test of the device under test, and the pulse current load is used for the pulse current test of the device under test.

[0050] Among them, the residual current load includes an adjustable resistor, which is used for the residual current test of the control and protection device to simulate the current leakage or unbalanced current situation. The residual current load can be used to test the response ability of the device when current leaks and check whether it can detect and cut off the circuit in time to prevent electrical fires or electrical accidents.

[0051] The pre-charge current load includes a rated resistor, which is used for the pre-charge current test of the control and protection device. The pre-charge current load simulates the initial charging stage when the device is powered on and helps detect whether the device can effectively control and limit the starting current to avoid electrical damage caused by sudden current.

[0052] The rated current load includes a resistor and an inductor connected in series, which is used for the rated current test of the control and protection device. This load simulates the continuous current of the device under normal working conditions, ensures that the device operates stably under the rated working current, and checks whether the device can operate for a long time under the specified current without overheating or damage.

[0053] The pulsed current load includes a resistor and a capacitor connected in series, and is used for the pulsed current test of the control and protection device. The pulsed current load simulates the situation of high-peak instantaneous current, and helps to detect the performance of the device when facing high-intensity current impact in a short time. The pulsed current load is often used to test the fast response ability of the device and its overcurrent protection mechanism.

[0054] Furthermore, the acquisition and display module includes a first current probe, a second current probe, a third current probe, and a fourth current probe. The switch switching module includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, and a fifth switch S5. The input power supply is connected to the device under test through the first switch S1, and the device under test is respectively connected to the residual current load, the pre-charge current load, the rated current load, and the pulsed current load through the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5.

[0055] In this embodiment, the first current probe, the second current probe, the third current probe, and the fourth current probe are respectively used to collect the current signals during the residual current test, the pre-charge current test, the rated current test, and the pulsed current test, and transmit the collected current signals to the data processing module. The data processing module includes:

[0056] A signal conditioning circuit: used to filter, amplify and other processes the current signals from each current probe, so as to eliminate noise and adjust the signals to a range suitable for further analysis.

[0057] A data acquisition unit: used to receive the conditioned current signals, and store and process these data in a digital form. The data acquisition unit can allocate the collected data to the corresponding test categories according to the time stamp, such as residual current, pre-charge current, rated current, pulsed current, etc.

[0058] A data analysis module: used to analyze and process the collected current data to judge whether the test passes. The analysis module compares the actually collected current value with the predetermined standard value, identifies whether there are over-standard, leakage or other abnormal conditions, and generates the corresponding test report or signal output.

[0059] An output interface: transmits the processed result to the main control module for the main control module to make further decisions. This interface can be connected to the main control module through digital signals or analog signals to update the test status and results in real time.

[0060] Furthermore, as Figure 2 shown, the timing control module includes a timer chip, an adder, a register, a first counter, a second counter, a first decoder, a second decoder, and a third decoder. The first counter is a three-bit counter, the second counter is a two-bit counter, and the register is a two-bit register with an initial value of 00.

[0061] Further, the timer chip is connected to the timing signal input port of the main control module and is used to output a clock signal to the main control module every preset period of time.

[0062] Further, the test result output port of the main control module is connected to the first input terminal of the first decoder, and the output terminal of the first counter is connected to the second input terminal of the first decoder through the third decoder; the first output terminal of the first decoder is connected to the input terminal of the adder, the second output terminal of the first decoder is connected to the input terminal of the first counter, the third output terminal of the first decoder is connected to the input terminal of the second counter, the output terminal of the first counter is connected to the first input terminal of the second decoder, the output terminal of the second counter is connected to the second input terminal of the second decoder, the first output terminal of the second decoder is connected to the clear bit of the first counter, the second output terminal of the second decoder is connected to the clear bit of the second counter, the third output terminal of the second decoder is connected to the stop test control port of the main control module, and the output terminal of the adder is respectively connected to the test item input port and the register of the main control module.

[0063] Further, the first decoder is a decoder with two inputs and three outputs. The first input is one output of the test result output terminal of the main control module, and the second input is one output of the third decoder. The first output is input to the input terminal of the adder, the second output is input to the input terminal of the first counter, and the third output is input to the input terminal of the second counter. The output rules of the first decoder are as follows:

[0064] When the input is 10, the three outputs of the first decoder are 100;

[0065] When the input is 00, the three outputs of the first decoder are 010;

[0066] When the input is 11, the three outputs of the first decoder are 011;

[0067] When the input is 01, the three outputs of the first decoder are 010.

[0068] Further, the second decoder is a decoder with five inputs and three outputs. The first three inputs are the three outputs of the first counter, and the last two inputs are the two outputs of the second counter. The first output is input to the clear port of the first counter, the second output is input to the clear port of the second counter, and the third output is input to the stop test control port of the main control module. The output rules of the second decoder are as follows:

[0069] When the input is 10011, the output is 110;

[0070] When the input is 10000, the output is 111;

[0071] When the input is 10001, the output is 111;

[0072] When the input is 10010, the output is 111; for other inputs, the output is 000.

[0073] Further, the third decoder is a decoder with three inputs and one output. The three inputs are the three outputs of the first counter, and the one output is input to the second input port of the first decoder. The output rule of the third decoder is as follows:

[0074] When the input is 000, the output is 0, and for other inputs, the output is 1.

[0075] Further, the main control module is used to execute the following process:

[0076] When the main control module receives a clock signal from the timing signal input port once, the main control module receives the output of the adder from the test item input port once, and outputs a control signal to the switch switching module according to the received signal to control the corresponding switch to close for testing. Specifically, it includes:

[0077] When the signal received by the test item input port is 00, output a control signal to the switch switching module to control the first switch S1 and the second switch S2 to close, and control the third switch S3, the fourth switch S4, and the fifth switch S5 to open, so as to realize the residual current test of the device under test;

[0078] When the signal received by the test item input port is 01, output a control signal to the switch switching module to control the first switch S1 and the third switch S3 to close, and control the second switch S2, the fourth switch S4, and the fifth switch S5 to open, so as to realize the pre-charge current test of the device under test;

[0079] When the signal received by the test item input port is 10, output a control signal to the switch switching module to control the first switch S1 and the fourth switch S4 to close, and control the second switch S2, the third switch S3, and the fifth switch S5 to open, so as to realize the rated current test of the device under test;

[0080] When the signal received by the test item input port is 11, output a control signal to the switch switching module to control the first switch S1 and the fifth switch S5 to close, and control the second switch S2, the third switch S3, and the fourth switch S4 to open, so as to realize the pulse current test of the device under test;

[0081] Among them, the switch switching module includes

[0082] The main control module receives the test result signal output by the data processing module. When the test is successful, it outputs a signal of 1 to the first input port of the first decoder through the test result output port. When the test fails, it outputs a signal of 0 to the first input port of the first decoder through the test result output port;

[0083] When the main control module receives a signal of 1 from the stop test control port, the test stops.

[0084] The working principle of this embodiment is as follows:

[0085] The system first outputs a clock signal periodically through the timer chip. Whenever the main control module receives the clock signal, the main control module will receive the output signal of the adder from the test item input port. This signal determines which current test is being performed currently (residual current test, pre-charge current test, rated current test, or pulse current test).

[0086] According to the received test item signal, the main control module will output the corresponding control signal to the switch switching module, thereby controlling the switching of different switches and selecting the corresponding current load for testing. The specific operations are as follows:

[0087] When the test item input signal is 00, the main control module outputs a control signal to the switch switching module to control the first switch and the second switch to close, and disconnect the third, fourth, and fifth switches. In this way, the current passes through the residual current load, and the system performs the residual current test to ensure that the device can work properly in case of leakage or grounding fault.

[0088] When the test item input signal is 01, the main control module outputs a control signal to the switch switching module to control the first switch and the third switch to close, and disconnect the other switches. In this way, the current passes through the pre-charge current load, and the system performs the pre-charge current test to simulate the initial current during the charging process to ensure that the device can charge normally when the battery power is insufficient.

[0089] When the test item input signal is 10, the main control module outputs a control signal to the switch switching module to control the first switch and the fourth switch to close, and disconnect the other switches. In this way, the current passes through the rated current load, and the system performs the rated current test to verify the performance of the device under the rated working current and ensure that there is no overload or damage under normal working conditions.

[0090] When the test item input signal is 11, the main control module outputs a control signal to the switch switching module to control the first switch and the fifth switch to close, and disconnect the other switches. In this way, the current passes through the pulse current load, and the system performs the pulse current test to simulate the impact of sudden current load and ensure that the device can withstand current fluctuations and impacts in a short period of time.

[0091] In each test phase, the switch switching module controls different switch combinations to make the current flow along the set path to the specified current load, so as to achieve precise control of different current test items. During the test process, the system will collect current data in real time through the acquisition and display module and transmit the data to the data processing module for analysis and processing. The main control module judges whether the test passes according to the test results of the data processing module.

[0092] When the test starts, the register signal is 00, the first counter is 000, and the second counter is 00. At this time, the test is successful. The main control module outputs a 1 signal to the first input of the first decoder. At this time, the second input of the first decoder is 0, so the first decoder outputs 100. Then the 1 signal is input to the adder, and the register is updated to 01. Therefore, the next time the test is performed, the main control module will test the pre-charge current.

[0093] When the test fails, the main control module outputs a 0 signal to the first input of the first decoder. At this time, the first decoder outputs 010, and the first counter is updated to 001. At this time, the input of the adder is 0, so the register remains unchanged, and the previous test item continues. When three consecutive tests pass, the first counter is 100 and the second counter is 11. Therefore, the second decoder outputs 110 at this time, and the first counter and the second counter are cleared. The main control module continues the test, and the third decoder outputs 0 at this time, so the first output of the first decoder becomes 1, and the adder adds 1 to the signal of the register. Therefore, the main control module proceeds to the next test item to achieve cyclic testing. When one of the three tests fails, the second decoder outputs 111 at this time, and the third output 1 is input to the test stop control port of the main control module to control the main control module to stop the test, indicating that the device under test is unqualified.

[0094] In this way, this embodiment can flexibly and precisely implement the current durability test of the charging cable control and protection device, ensuring the stability and safety of the device under different current conditions.

[0095] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A current durability test system for a control and protection device on a charging cable, characterized in that, Including: An input power supply, a device under test, a main control module, a data processing module, a timing control module, a switch switching module, a acquisition and display module, and a current load module. The input power supply is connected to the device under test. The device under test is connected to the current load module through the acquisition and display module and the switch switching module. The acquisition and display module is connected to the data processing module. The data processing module is connected to the main control module. The main control module is respectively connected to the timing control module and the switch switching module; The current load module includes a residual current load, a pre-charge current load, a rated current load, and a pulse current load. The current durability test system includes a residual current test, a pre-charge current test, a rated current test, and a pulse current test; The residual current load is used for the residual current test of the device under test. The pre-charge current load is used for the pre-charge current test of the device under test. The rated current load is used for the rated current test of the device under test. The pulse current load is used for the pulse current test of the device under test.

2. The current durability test system for the control and protection device on a charging cable according to claim 1, characterized in that, The acquisition and display module includes a first current probe, a second current probe, a third current probe, and a fourth current probe. The switch switching module includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch. The input power supply is connected to the device under test through the first switch. The device under test is respectively connected to the residual current load, the pre-charge current load, the rated current load, and the pulse current load through the second switch, the third switch, the fourth switch, and the fifth switch.

3. The current durability test system for the control and protection device on a charging cable according to claim 1, wherein The timing control module includes a timer chip, an adder, a register, a first counter, a second counter, a first decoder, a second decoder, and a third decoder. The first counter is a three-bit counter. The second counter is a two-bit counter. The register is a two-bit register with an initial value of 00.

4. The current durability test system for the control and protection device on a charging cable according to claim 3, characterized in that, The timer chip is connected to the timing signal input port of the main control module and is used to output a clock signal to the main control module every preset period of time.

5. The current durability test system of a control and protection device on a charging cable according to claim 3, characterized in that, The test result output port of the main control module is connected to the first input terminal of the first decoder. The output terminal of the first counter is connected to the second input terminal of the first decoder through the third decoder. The first output terminal of the first decoder is connected to the input terminal of the adder. The second output terminal of the first decoder is connected to the input terminal of the first counter. The third output terminal of the first decoder is connected to the input terminal of the second counter. The output terminal of the first counter is connected to the first input terminal of the second decoder. The output terminal of the second counter is connected to the second input terminal of the second decoder. The first output terminal of the second decoder is connected to the clear bit of the first counter. The second output terminal of the second decoder is connected to the clear bit of the second counter. The third output terminal of the second decoder is connected to the stop test control port of the main control module. The output terminal of the adder is respectively connected to the test item input port and the register of the main control module.

6. The current durability test system of a control and protection device on a charging cable according to claim 3, characterized in that, The first decoder is a decoder with two inputs and three outputs. The first input is one output of the test result output terminal of the main control module, the second input is one output of the third decoder, the first output is input to the input terminal of the adder, the second output is input to the input terminal of the first counter, and the third output is input to the input terminal of the second counter. The output rule of the first decoder is as follows: When the input is 10, the three outputs of the first decoder are 100; When the input is 00, the three outputs of the first decoder are 010; When the input is 11, the three outputs of the first decoder are 011; When the input is 01, the three outputs of the first decoder are 010.

7. The current durability test system for the control and protection device on a charging cable according to claim 3, characterized in that, The second decoder is a decoder with five inputs and three outputs. The first three inputs are the three outputs of the first counter, and the last two inputs are the two outputs of the second counter. The first output is input to the clear port of the first counter, the second output is input to the clear port of the second counter, and the third output is input to the stop test control port of the main control module. The output rule of the second decoder is as follows: When the input is 10011, the output is 110; When the input is 10000, the output is 111; When the input is 10001, the output is 111; When the input is 10010, the output is 111; for other inputs, the output is 000.

8. The current durability test system for the control and protection device on a charging cable according to claim 3, characterized in that, The third decoder is a decoder with three inputs and one output. The three inputs are the three outputs of the first counter, and one output is input to the second input port of the first decoder. The output rule of the third decoder is as follows: When the input is 000, the output is 0, and for other inputs, the output is 1.

9. The current durability test system for the control and protection device on a charging cable according to claim 1, characterized in that, The main control module is used to execute the following process: When the main control module receives a clock signal from the timing signal input port once, the main control module receives the output of the adder from the test item input port once, and outputs a control signal to the switch switching module according to the received signal to control the corresponding switch to close for testing. Specifically, it includes: When the signal received by the test item input port is 00, output a control signal to the switch switching module to control the first switch and the second switch to close, and control the third switch, the fourth switch, and the fifth switch to open, so as to realize the residual current test of the device under test; When the signal received by the test item input port is 01, output a control signal to the switch switching module to control the first switch and the third switch to close, and control the second switch, the fourth switch, and the fifth switch to open, so as to realize the pre-charge current test of the device under test; When the signal received by the test item input port is 10, output a control signal to the switch switching module to control the first switch and the fourth switch to close, and control the second switch, the third switch, and the fifth switch to open, so as to realize the rated current test of the device under test; When the signal received by the test item input port is 11, output a control signal to the switch switching module to control the first switch and the fifth switch to close, and control the second switch, the third switch, and the fourth switch to open, so as to realize the pulse current test of the device under test; The main control module receives the test result signal output by the data processing module. When the test is successful, it outputs a 1 signal to the first input port of the first decoder through the test result output port. When the test fails, it outputs a 0 signal to the first input port of the first decoder through the test result output port; When the main control module receives a 1 signal from the stop test control port, the test is stopped.

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