Current durability test system of control and protection device on charging cable

Abstract

The invention discloses a current durability test system for a control and protection device on a charging cable. The current durability test system comprises an input power supply, a tested product device, a main control module, a data processing module, a time sequence control module, a switch switching module, an acquisition display module and a current load module. By accurately controlling the time sequence in the test process, the time sequence control module ensures that all the test stages are executed in sequence. And the switch switching module switches different current loads according to the control signal, so that multiple tests of residual current, pre-charging current, rated current and pulse current are realized. Each current test signal is collected by the current probe and is transmitted to the data processing module. And the main control module controls the switch switching module according to a test result to ensure that the system executes a test according to a predetermined flow, and durability test requirements under different current loads are met. The system can efficiently and accurately evaluate the durability of the charging cable and related equipment, and has the advantages of simplicity and convenience in operation, high automation, high test precision and the like.

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: (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.

[0004] (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.

[0005] (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.

[0006] (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.

[0007] 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

[0008] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a current durability testing system for a control and protection device on a charging cable.

[0009] The purpose of the present invention can be achieved by the following technical solutions: The present invention provides a current durability test system for a control and protection device on a charging cable, comprising: An input power supply, a device under test, a main control module, a data processing module, a timing control module, a switch switching module, an 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, and the main control module is respectively connected to the timing control module and the switch switching module.

[0010] Furthermore, the current load module includes a residual current load, a pre-charge current load, a rated current load, and a pulse current load, and 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 a residual current test of the device under test, the pre-charge current load is used for a pre-charge current test of the device under test, the rated current load is used for a rated current test of the device under test, and the pulse current load is used for a pulse current test of the device under test.

[0011] 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, 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, and the device under test is 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, respectively.

[0012] 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, and the register is a two-bit register with an initial value of 00.

[0013] 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.

[0014] Further, the test result output port of the main control module is connected to the first bit input terminal of the first decoder, and the output terminal of the first counter is connected to the second bit input terminal of the first decoder through the third decoder; the first bit output terminal of the first decoder is connected to the input terminal of the adder, the second bit output terminal of the first decoder is connected to the input terminal of the first counter, the third bit 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 bit input terminal of the second decoder, the output terminal of the second counter is connected to the second bit input terminal of the second decoder, the first bit output terminal of the second decoder is connected to the reset bit of the first counter, the second bit output terminal of the second decoder is connected to the reset bit of the second counter, the third bit 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.

[0015] Further, the first decoder is a decoder with two inputs and three outputs, the first input is a one-bit output of the test result output terminal of the main control module, the second input is a one-bit 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 first decoder's three-bit output is 100; When the input is 00, the first decoder's three-bit output is 010; When the input is 11, the first decoder's three-bit output is 011; When the input is 01, the first decoder outputs three bits as 010.

[0016] 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, the last two inputs are the two outputs of the second counter, the first output is input to the reset port of the first counter, the second output is input to the reset 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: 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; other inputs are all output 000.

[0017] Furthermore, the third decoder is a decoder with three-bit input and one-bit output, the three-bit input is the three-bit output of the first counter, and the one-bit 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 other inputs are all output 1.

[0018] Furthermore, the main control module is used to perform the following process: When the main control module receives a clock signal from the timing signal input port, the main control module receives the output of the adder from the test item input port, and outputs a control signal to the switch switching module according to the received signal, and controls the corresponding switch to close to implement the test, specifically including: When the signal received by the test item input port is 00, a control signal is output to the switch switching module to control the first switch and the second switch to be closed, and the third switch, the fourth switch, and the fifth switch to be opened, so as to implement a residual current test on the device under test; When the signal received by the test item input port is 01, a control signal is output to the switch switching module to control the first switch and the third switch to be closed, and the second switch, the fourth switch, and the fifth switch to be opened, so as to implement a pre-charge current test on the device under test; When the signal received by the test item input port is 10, a control signal is output to the switch switching module to control the first switch and the fourth switch to be closed, and the second switch, the third switch, and the fifth switch to be opened, so as to implement a rated current test on the device under test; When the signal received by the test item input port is 11, a control signal is output to the switch switching module to control the first switch and the fifth switch to be closed, and the second switch, the third switch, and the fourth switch to be opened, so as to implement a pulse current test on the device under test; The main control module receives the test result signal output by the data processing module, and when the test succeeds, outputs a 1 signal to the first input port of the first decoder through the test result output port, and when the test fails, 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.

[0019] Compared with the prior art, the present invention has the following advantages: (1) The present invention realizes the alternating test of different current modes (such as residual current, pre-charge current, rated current, and pulse current) by setting residual current load, pre-charge current load, rated current load, and pulse current load, and can fully simulate the performance of the charging cable under different working conditions. This setting overcomes the limitation of the single current test mode in the prior art, and enables the test system to more accurately evaluate the durability of the control and protection device in a complex current environment.

[0020] (2) The present invention realizes fully automatic control and monitoring of the test process by introducing a timing control module and a multi-level decoder structure. When each test fails, the system can automatically start the retry mechanism and perform up to three retries to ensure that each test item can pass before entering the next test link. In this way, the automation level of the test is greatly improved, the need for manual intervention is reduced, and time and labor costs are saved.

[0021] (3) The present invention uses a timer chip connected to the main control module to accurately control the time interval of each test phase, ensuring that each step in the test process can be carried out according to the preset time, avoiding delays or inconsistencies in the test process. This precise timing control improves the accuracy of the test results and ensures the stability of each test phase.

[0022] (4) The second decoder of the present invention is connected to the stop test control port of the main control module, which can automatically stop the test when a system error is detected, avoiding unnecessary repetition and the influence of errors during the test process. This mechanism not only improves the stability of the test, but also ensures that the system can be stopped in time when a fault occurs, preventing further damage or erroneous data generation.

[0023] (5) The present invention uses a multi-bit counter and a decoder to 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 test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a system schematic diagram of the present invention; Figure 2 It is a schematic diagram of the timing control module of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] This embodiment provides a current durability test system for a control and protection device on a charging cable. Figure 1 As shown, 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, an 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, and the main control module is respectively connected to the timing control module and the switch switching module.

[0027] Furthermore, the current load module includes a residual current load, a pre-charge current load, a rated current load, and a pulse current load, and 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 a residual current test of the device under test, the pre-charge current load is used for a pre-charge current test of the device under test, the rated current load is used for a rated current test of the device under test, and the pulse current load is used for a pulse current test of the device under test.

[0028] Among them, the residual current load includes an adjustable resistor, which is used to control and protect the residual current test of the device, simulating current leakage or unbalanced current. The residual current load can be used to test the response ability of the equipment in the event of current leakage, and check whether it can detect and cut off the circuit in time to prevent electrical fires or electrical accidents.

[0029] The pre-charge current load includes a rated resistor and is used for pre-charge current testing of control and protection devices. The pre-charge current load simulates the initial charging stage when the device is powered on, helping to detect whether the device can effectively control and limit the startup current to avoid electrical damage caused by sudden current.

[0030] The rated current load consists of a series resistor and inductor, and is used for rated current testing of control and protection devices. This load simulates the continuous current of the device under normal working conditions, ensures that the device operates stably at the rated working current, and checks whether the device can operate for a long time at the specified current without overheating or damage.

[0031] Pulse current loads consist of resistors and capacitors connected in series, and are used for pulse current testing of control and protection devices. Pulse current loads simulate high peak instantaneous current conditions, helping to detect how devices perform when faced with high-intensity current shocks in a short period of time. Pulse current loads are often used to test the rapid response capabilities of equipment and its overcurrent protection mechanisms.

[0032] Furthermore, the acquisition and display module includes a first current probe, a second current probe, a third current probe, and a fourth current probe, and 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 connected to the residual current load, the pre-charge current load, the rated current load, and the pulse current load through the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5, respectively.

[0033] In this embodiment, the first current probe, the second current probe, the third current probe, and the fourth current probe respectively collect current signals during the residual current test, the pre-charge current test, the rated current test, and the pulse current test, and transmit the collected current signals to the data processing module, and the data processing module includes: Signal conditioning circuit: used to filter, amplify and process the current signals from each current probe in order to eliminate noise and adjust the signal to a range suitable for further analysis.

[0034] Data acquisition unit: used to receive conditioned current signals and store and process these data in digital form. The data acquisition unit can assign the collected data to the corresponding test category according to the timestamp, such as residual current, pre-charge current, rated current, pulse current, etc.

[0035] Data analysis module: used to analyze and process the collected current data to determine whether the test has passed. The analysis module compares the actual collected current value with the predetermined standard value to identify whether there is an over-standard, leakage or other abnormal situation, and generates a corresponding test report or signal output.

[0036] Output interface: transmits the processed results to the main control module for further decision-making by the main control module. 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.

[0037] Further, such as Figure 2 As 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.

[0038] 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.

[0039] Further, the test result output port of the main control module is connected to the first bit input terminal of the first decoder, and the output terminal of the first counter is connected to the second bit input terminal of the first decoder through the third decoder; the first bit output terminal of the first decoder is connected to the input terminal of the adder, the second bit output terminal of the first decoder is connected to the input terminal of the first counter, the third bit 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 bit input terminal of the second decoder, the output terminal of the second counter is connected to the second bit input terminal of the second decoder, the first bit output terminal of the second decoder is connected to the reset bit of the first counter, the second bit output terminal of the second decoder is connected to the reset bit of the second counter, the third bit 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.

[0040] Further, the first decoder is a decoder with two inputs and three outputs, the first input is a one-bit output of the test result output terminal of the main control module, the second input is a one-bit 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 first decoder's three-bit output is 100; When the input is 00, the first decoder's three-bit output is 010; When the input is 11, the first decoder's three-bit output is 011; When the input is 01, the first decoder outputs three bits as 010.

[0041] 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, the last two inputs are the two outputs of the second counter, the first output is input to the reset port of the first counter, the second output is input to the reset 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: 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; other inputs output 000.

[0042] Furthermore, the third decoder is a decoder with three-bit input and one-bit output, the three-bit input is the three-bit output of the first counter, and the one-bit 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 other inputs are all output 1.

[0043] Furthermore, the main control module is used to perform the following process: When the main control module receives a clock signal from the timing signal input port, the main control module receives the output of the adder from the test item input port, and outputs a control signal to the switch switching module according to the received signal, and controls the corresponding switch to close to implement the test, specifically including: When the signal received by the test item input port is 00, a control signal is output to the switch switching module to control the first switch S1 and the second switch S2 to be closed, and the third switch S3, the fourth switch S4, and the fifth switch S5 to be opened, so as to implement the residual current test of the device under test; When the signal received by the test item input port is 01, a control signal is output to the switch switching module to control the first switch S1 and the third switch S3 to be closed, and the second switch S2, the fourth switch S4, and the fifth switch S5 to be opened, so as to implement a pre-charge current test on the device under test; When the signal received by the test item input port is 10, a control signal is output to the switch switching module to control the first switch S1 and the fourth switch S4 to be closed, and the second switch S2, the third switch S3, and the fifth switch S5 to be opened, so as to implement the rated current test of the device under test; When the signal received by the test item input port is 11, a control signal is output to the switch switching module to control the first switch S1 and the fifth switch S5 to be closed, and the second switch S2, the third switch S3, and the fourth switch S4 to be opened, so as to implement a pulse current test on the device under test; The switch module includes The main control module receives the test result signal output by the data processing module, and when the test succeeds, outputs a 1 signal to the first input port of the first decoder through the test result output port, and when the test fails, 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.

[0044] The working principle of this embodiment is as follows: The system first outputs a clock signal periodically through the timer chip. Whenever the main control module receives the clock signal, it receives the output signal of the adder from the test item input port. This signal determines which current test is currently being performed (residual current test, pre-charge current test, rated current test or pulse current test).

[0045] 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 operation is as follows: 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 open 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 equipment can work normally in the case of leakage or ground fault.

[0046] 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 a pre-charge current test to simulate the initial current during the charging process to ensure that the device can be charged normally when the battery is low.

[0047] 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 equipment under the rated working current and ensure that no overload or damage occurs under normal working conditions.

[0048] 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 a pulse current test to simulate the impact of sudden current loads and ensure that the equipment can withstand current fluctuations and shocks in a short period of time.

[0049] In each test phase, the switch switching module controls different switch combinations to make the current flow to the specified current load along the set path, thereby achieving precise control of different current test items. During the test, 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 determines whether the test is passed based on the test results of the data processing module.

[0050] When the test starts, the register signal is 00, the first counter is 000, and the second counter is 00. The test is successful at this time, and the main control module outputs a 1 signal to the first bit input of the first decoder. At this time, the second bit input of the first decoder is 0, and 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 conducted, the main control module will test the pre-charge current test.

[0051] When the test fails, the main control module outputs a 0 signal to the first bit 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, and the register remains unchanged, and the previous test item continues. When all three tests pass, the first counter is 100 and the second counter is 11. Therefore, the second decoder will output 110, the first counter and the second counter will be cleared, and the main control module continues to test. At this time, the third decoder outputs 0, so the first bit output of the first decoder becomes 1, and the adder will add 1 to the signal of the register, so the main control module performs the next test item to realize the cyclic test; when one of the three tests fails, the second decoder will output 111, and the third bit 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.

[0052] In this way, the present embodiment can flexibly and accurately 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.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on 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: include: An input power supply, a device under test, a main control module, a data processing module, a timing control module, a switch switching module, an 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, and the main control module is respectively connected to the timing control module and the switch switching module.

2. The current durability test system of the control and protection device on the charging cable according to claim 1, characterized in that: The current load module includes residual current load, pre-charge current load, rated current load, and pulse current load, and the current durability test system includes residual current test, pre-charge current test, rated current test, and pulse current test; The residual current load is used for residual current testing of the device under test, the pre-charge current load is used for pre-charge current testing of the device under test, the rated current load is used for rated current testing of the device under test, and the pulse current load is used for pulse current testing of the device under test.

3. The current durability test system of the control and protection device on the 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, and the device under test is 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, respectively.

4. The current durability test system of the control and protection device on the charging cable according to claim 1, characterized in that: 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.

5. The current durability test system of the control and protection device on the charging cable according to claim 4, 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 after every preset period of time.

6. The current durability test system of the control and protection device on the charging cable according to claim 4, characterized in that: The test result output port of the main control module is connected to the first bit input end of the first decoder, and the output end of the first counter is connected to the second bit input end of the first decoder through the third decoder; the first bit output end of the first decoder is connected to the input end of the adder, the second bit output end of the first decoder is connected to the input end of the first counter, the third bit output end of the first decoder is connected to the input end of the second counter, the output end of the first counter is connected to the first bit input end of the second decoder, the output end of the second counter is connected to the second bit input end of the second decoder, the first bit output end of the second decoder is connected to the reset bit of the first counter, the second bit output end of the second decoder is connected to the reset bit of the second counter, the third bit output end of the second decoder is connected to the stop test control port of the main control module, and the output end of the adder is respectively connected to the test item input port and the register of the main control module.

7. The current durability test system of the control and protection device on the charging cable according to claim 4, characterized in that: The first decoder is a decoder with two inputs and three outputs. The first input is an output of the test result output terminal of the main control module, the second input is an 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 first decoder's three-bit output is 100; When the input is 00, the first decoder's three-bit output is 010; When the input is 11, the first decoder's three-bit output is 011; When the input is 01, the first decoder outputs three bits as 010.

8. The current durability test system of the control and protection device on the charging cable according to claim 4, 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, the last two inputs are the two outputs of the second counter, the first output is input to the reset port of the first counter, the second output is input to the reset 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: 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; other inputs are all output 000.

9. The current durability test system of the control and protection device on the charging cable according to claim 4, characterized in that: The third decoder is a decoder with three-bit input and one-bit output, the three-bit input is the three-bit output of the first counter, and the one-bit 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 other inputs are all output 1.

10. A current durability test system for a control and protection device on a charging cable according to claim 1, characterized in that: The main control module is used to perform the following process: When the main control module receives a clock signal from the timing signal input port, the main control module receives the output of the adder from the test item input port, and outputs a control signal to the switch switching module according to the received signal, and controls the corresponding switch to close to implement the test, specifically including: When the signal received by the test item input port is 00, a control signal is output to the switch switching module to control the first switch and the second switch to be closed, and the third switch, the fourth switch, and the fifth switch to be opened, so as to implement a residual current test on the device under test; When the signal received by the test item input port is 01, a control signal is output to the switch switching module to control the first switch and the third switch to be closed, and the second switch, the fourth switch, and the fifth switch to be opened, so as to implement a pre-charge current test on the device under test; When the signal received by the test item input port is 10, a control signal is output to the switch switching module to control the first switch and the fourth switch to be closed, and the second switch, the third switch, and the fifth switch to be opened, so as to implement a rated current test on the device under test; When the signal received by the test item input port is 11, a control signal is output to the switch switching module to control the first switch and the fifth switch to be closed, and the second switch, the third switch, and the fourth switch to be opened, so as to implement a pulse current test on the device under test; The main control module receives the test result signal output by the data processing module, and when the test succeeds, outputs a 1 signal to the first input port of the first decoder through the test result output port, and when the test fails, 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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