An alternating current charging pile low-power equivalent full-load test aging method and an aging device

Abstract

The application discloses a low-power equivalent full-load aging device and an aging method for quality inspection of high-power alternating current charging piles, and belongs to the technical field of factory detection of electric vehicle charging equipment. The device comprises a low-resistance closed loop, an adjustable power frequency low-voltage access loop, a constant current control output loop and a charging pile internal current collection loop. The low-resistance closed loop is connected with the adjustable power frequency low-voltage access loop and the constant current control output loop, and the constant current control output loop is connected with the charging pile internal current collection loop. The application can cover aging and interoperability testing of all specifications of alternating current charging piles, has simple hardware and high reliability, is suitable for efficient and energy-saving detection of large-scale production lines, and is convenient for test detection.

Description

Technical Field

[0001] This invention relates to the field of AC charging piles and testing technology for electric vehicles, specifically to a low-power equivalent full-load test aging device and aging method for AC charging piles. Background Technology

[0002] Burn-in testing (also known as burn-in or burn-out testing) is a critical reliability testing step in the manufacturing process of electronic devices. Before leaving the factory, electronic products are forced to operate under specified electrical stress, thermal stress, or environmental stress conditions for a specific period of time. By simulating and accelerating the stress conditions that the product may experience throughout its entire life cycle, potential defects are exposed and caused to fail before leaving the factory, thereby screening out products that meet quality standards.

[0003] Mass production of AC charging piles requires full-load aging tests. Traditional methods using 3.5kW to 14kW resistive loads result in huge energy consumption, severe heat generation, and high costs. As annual production reaches tens of millions of units, energy consumption increases exponentially. Existing energy-saving solutions are complex and costly, making them difficult to adapt to the requirements of minimalist, reliable, and low-cost production lines.

[0004] Among the related technologies is Chinese patent publication number CN119953214A, which combines the test load with the structure of an underground charging pile to construct a test cabinet containing core equipment such as a load disturbance generator, a load coupling device, a programmable AC electronic load, and a power quality analyzer. The load disturbance generator generates a step load disturbance signal, and the load coupling device realizes continuous adjustment of the load impedance. The sliding time window method is used to analyze the electrical parameters in real time during the load disturbance process, extract the load response characteristics and power quality change characteristics, use a charging load adaptive model to generate the optimal load adjustment parameters, and combine the charging performance evaluation model to perform a comprehensive performance evaluation. This scheme has a relatively complex structure and high cost.

[0005] Another Chinese patent document, CN120262438A, discloses a testing method that includes collecting and analyzing multi-dimensional electrical parameters of a target charging pile to obtain initial electrical data; calculating the output power fluctuation state of the target charging pile based on the initial electrical data to obtain output power fluctuation state parameters; if the output power fluctuation state parameters exceed a preset threshold, identifying the load type of the device to be charged based on the output power fluctuation state parameters to obtain the load type; selecting a load adjustment strategy for the target charging pile based on the load type to obtain a load adjustment command; and controlling the power output of the target charging pile based on the load adjustment command using an IGBT drive circuit installed in the target charging pile to obtain the target output power. This method solves the technical problem of how charging piles can work stably under various conditions and intelligently adapt to different types of load demands.

[0006] EP 3872505 A1 This invention utilizes a combination of a power load transistor unit and a current compensation unit to achieve load adjustment. First, the logic switching of the power load transistor unit is controlled according to a set current-carrying value. Then, the current compensation unit is controlled to perform current compensation based on the actual current-carrying value collected after switching, ensuring that the actual current-carrying value equals the set current-carrying value. This provides the load current for the charging pile during testing, meeting testing requirements. This invention only requires a power load transistor unit and a current compensation unit to achieve current adjustment during charging pile testing, eliminating the need for a programmable integrated electronic load. Summary of the Invention

[0007] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, embodiments of this invention propose a low-power equivalent full-load test aging device and method for AC charging piles. This method maximizes the output capacity of the AC charging pile by sharing a single system with the vehicle charging OBC response and AC charging pile measurements. It automatically implements load testing, reducing the frequency of manual load adjustment during testing and the need to detect whether the AC charging pile outputs a correct PWM signal during the aging process. The interoperability protocol with the vehicle OBC can also be used for full-item testing, allowing developers to easily assess the various performance aspects of the AC charging pile in any situation. This provides a means for full-process testing in after-sales and third-party testing scenarios.

[0008] A low-power equivalent full-load test aging method for AC charging piles according to a first aspect of the present invention includes: a low-resistance closed loop, an adjustable power frequency low-voltage access loop, a constant current control output loop, and an internal current acquisition loop of the charging pile. The low-resistance closed loop is connected to the adjustable power frequency low-voltage access loop and the constant current control output loop, and the constant current control output loop is connected to the internal current acquisition loop of the charging pile. The method steps include: Set the total resistance of the low-resistance closed-loop circuit to the rated value; Input the rated adjustable power frequency voltage to the low-impedance closed-loop circuit; Set the test current of the constant current control output circuit to the rated value; Collect the actual current of the charging pile, calculate the power based on the rated voltage of 220V, and enter the full-load aging state. Maintain the constant current control output circuit set current to complete full-load aging.

[0009] Furthermore, the rated input power frequency voltage is 0~3V.

[0010] Furthermore, the rated value of the test current of the constant current control output circuit can be set to: 8A, 16A, 32A, or 50A.

[0011] Furthermore, the rated total resistance of the low-resistance closed-loop circuit is any value from 0.015Ω to 0.025Ω.

[0012] Furthermore, when the rated test current of the constant current control output circuit is 32A, the input rated power frequency excitation voltage during aging is 0.63V, and the power consumption is 20.16W; when the rated test current of the constant current control output circuit is 50A, the input rated power frequency excitation voltage during aging is 1V, and the power consumption is 50W.

[0013] According to an embodiment of the first aspect of this application, a low-power equivalent full-load test aging method for AC charging piles has at least the following beneficial effects: This invention adopts a preset low-voltage power frequency input and a preset low-resistance closed loop. The preset test current is output to the charging pile by the constant current control output circuit. The actual current during the aging test of the charging pile is collected, and a full-load aging test is performed. This method has full current range, real large current equivalent full load, simulates the effect of car charging, has extremely low power consumption and low voltage safety, and can simultaneously complete all aspects of the interoperability test of the charging pile.

[0014] This invention also proposes a low-power equivalent full-load test aging device for AC charging piles. The aging device includes: a low-resistance closed loop, an adjustable power frequency low-voltage access loop, a constant current control output loop, and an internal current acquisition loop for the charging pile. The low-resistance closed loop is connected to the adjustable power frequency low-voltage access loop and the constant current control output loop. The constant current control output loop is connected to the internal current acquisition loop for the charging pile. The low-resistance closed loop is used to preset a rated resistance value. The adjustable power frequency low-voltage access loop is used to preset a rated power frequency input voltage to provide the aging test voltage input. The constant current control output loop is used to output a rated aging test current to the charging gun. The internal current acquisition loop for the charging pile is used to acquire the actual aging current of the charging pile. The low-power equivalent full-load test aging device for AC charging piles executes the low-power equivalent full-load test aging method for AC charging piles as described in claim 1.

[0015] Furthermore, the low-resistance closed-loop circuit is composed of a charging pile input cable, a charging gun output cable, a standard relay, and PCB copper foil connected in series.

[0016] Furthermore, the charging pile input cable and the charging gun output cable are 6mm² copper wires with a total length of 6 meters and a total circuit resistance of 0.025Ω.

[0017] Furthermore, the standard relay is a 40A national standard relay, the length of the PCB copper foil does not exceed 10cm, and the total circuit resistance is 0.015Ω.

[0018] According to an embodiment of the second aspect of this application, an AC charging pile low-power equivalent full-load test aging device has at least the following beneficial effects: This invention adopts a low-voltage power frequency voltage input to a low-resistance closed loop, and outputs test current to the charging pile through a constant current control output loop. The actual current during the aging test is collected through the charging pile's internal current acquisition loop to achieve the effect of full-load aging test. This device has a full range of current levels, real large current equivalent full load, simulates the effect of car charging, has extremely low power consumption, low voltage safety, and can simultaneously complete all aspects of charging pile interoperability testing.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This application provides a schematic diagram of the composition of an AC charging pile low-power equivalent full-load test aging device. Figure 2 This application provides a schematic diagram illustrating the composition principle of an AC charging pile low-power equivalent full-load test aging device. Figure 3 This application provides a schematic diagram of the steps for a low-power equivalent full-load test aging method for AC charging piles, as illustrated in the embodiments of this application. Figure 4 This is a schematic diagram illustrating the implementation steps of a low-power equivalent full-load test aging method for AC charging piles provided in an embodiment of this application. Figure 5 This is a schematic diagram of the circuit principle of a low-power equivalent full-load test aging device for an AC charging pile, provided for the application embodiment.

[0021] Figure label: 1. Adjustable power frequency low-voltage excitation transformer; 2. Output current execution control board; 3. Transformer output, relay, and charging gun closed-loop circuit; 4. Core detection and output control board; 5. AC charging pile under test. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] Mass production of AC charging piles necessitates full-load aging tests. Traditional methods employ resistive loads ranging from 3.5kW to 14kW, resulting in significant energy consumption, heat generation, and high costs. With annual production reaching tens of millions of units, energy consumption increases exponentially. Existing energy-saving solutions are complex and costly, failing to meet the demands of streamlined, reliable, and low-cost production lines. Therefore, this invention proposes a low-power equivalent full-load aging device and method for quality inspection in the production of high-power AC charging piles, addressing the aforementioned problems.

[0025] In aging tests, the aging voltage is determined by the charging pile's power supply state under full load, which typically causes the charging pile to operate at the upper limit of constant current mode. The aging voltage is slightly affected by grid / feedback loop disturbances but averages approximately 220V. The charging pile current I measured at this time directly reflects the power output status. If the actual charging pile current I is approximately equal to the rated charging pile current I, it indicates that the charging pile is under full load. If the actual charging pile current I < the rated charging pile current I, it means that the charging pile is not at full load. This may be due to increased line impedance, voltage drop leading to low voltage, or a fault in the charging pile itself.

[0026] The PWM duty cycle of the charging gun's CP signal is used to represent the maximum charging current that the charging station can provide: A duty cycle of 10% indicates a current request of 6A, a duty cycle of 53.3% indicates a current request of 32A, and a duty cycle of 96% indicates a current request of 80A.

[0027] In actual aging tests, the complete process of the charging gun's CP signal is as follows: The charging pile outputs a +9V CP voltage. The test system closes its internal S2 switch (simulating the on-board charger's state), and the charging gun's CP voltage drops to +6V. After recognizing this state change, the charging pile activates its internal relay to start outputting. This process simultaneously completes the dual verification of the physical connection of the occupied line and the full-load judgment. If the on-board charger does not simulate a suitable charging current requirement, the charging pile may limit the power output, causing the test to be misleadingly interpreted as a non-full-load state. Therefore, aging test systems typically include: outputting a full-load request through the charging gun's CP signal (PWM duty cycle) based on the internal rated current.

[0028] The nominal output voltage of a charging pile under test is typically 220V, and the rated output current obtained from the charging pile's nameplate information is the rated current I. In mass production aging tests of charging piles, 220V × I is used as an equivalent value to identify full load. The principle behind this is: The test system first communicates with the charging pile under test to obtain its nominal rated current value I. Then, it applies a steady-state rated voltage of 220V to the output terminal of the charging pile and sets the electronic load constant current (CC) mode to the rated current value, forcing the charging pile to output at the rated power, thereby realizing the equivalent simulation of the full-load condition.

[0029] Example 1, please refer to Figure 1 and Figure 2 According to a first aspect of the present invention, an aging method for low-power equivalent full-load testing of an AC charging pile includes: a low-resistance closed-loop circuit, an adjustable power frequency low-voltage access circuit, a constant current control output circuit, and an internal current acquisition circuit of the charging pile. The low-resistance closed-loop circuit is connected to the adjustable power frequency low-voltage access circuit and the constant current control output circuit, and the constant current control output circuit is connected to the internal current acquisition circuit of the charging pile. The testing method steps are as follows: The charging pile input is connected to the power grid terminal of the test aging device, and the charging gun is connected to the charging gun port of the test terminal of the test aging device. The test device is connected to the power grid terminal and the charging pile in parallel with the same phase. In this embodiment, the adjustable power frequency low voltage access circuit can be selected from an AC transformer. The transformer outputs an adjustable power frequency low voltage of 0-3V, which is synchronously connected to the input terminal of the charging pile. The LN lines cannot be reversed. The constant current controller in the test aging device measures the PWM duty cycle of the charging pile control guide, calculates the maximum output current according to the charging pile standard, and automatically and gradually increases the current to the target value starting from the lowest current. The charging pile is identified as rated full load. The heat generation characteristics of the input and output physical connections of the charging pile equipment under full load are tested, as well as other synchronous tests performed by the test device according to the aging test standard. The test is completed after running for a set time to complete the verification test or aging. The aging test device has an actual power consumption of only 20-50W throughout the entire process, with no high heat and no need for a high-power load.

[0030] Please refer to Figure 3 According to a first aspect embodiment of the present invention, a method for automatically detecting and matching motor parameters includes: Step 201: Set the total resistance of the low-resistance closed-loop circuit to the rated value; The low-resistance closed-loop circuit consists of the charging pile input cable, the charging gun output cable, a standard relay, and PCB copper foil connected in series. By setting the length and width of the PCB copper foil, the resistance value of the low-resistance closed-loop circuit can be preset. For example, the total resistance of the charging pile input cable and the charging gun output cable connected in series is 0.025Ω, and the resistance of the PCB copper foil is 0.015Ω.

[0031] Step 202: Input the rated adjustable power frequency voltage into the low-impedance closed-loop circuit; Through the power frequency transformer, which can output a low voltage of 0~3V, the rated low voltage power frequency voltage is input to the low resistance closed loop circuit.

[0032] Step 203: Set the constant current control output circuit test current to the rated value; By adjusting the output current control board, the constant current control output circuit test current can be set according to the rated output current of the charging gun, such as 8A, 16A, 32A, 50A, and the maximum can be set to 100A.

[0033] Step 204: Collect the actual current of the charging pile, calculate the power based on the rated voltage of 220V, and enter the full-load aging state; By collecting the actual charging current of the charging pile and calculating the power equivalent to the rated voltage of 220V, the charging pile is considered to be in full load condition when the actual charging current is equal to the rated current of the charging gun.

[0034] Step 205: Maintain the constant current control output circuit set current to complete aging; The aging test is completed by maintaining the required test current in the constant current control output circuit.

[0035] In this embodiment, please refer to Figure 2 , Figure 4 The method for automatically detecting and matching motor parameters according to the first aspect embodiment of the present invention is further described as follows: The method steps include: For other embodiments of this invention, please refer to... Figure 2 and Figure 4 The method and steps are as follows: 1. Power on the AC charging pile low-power equivalent full-load test aging device with power frequency power supply. 2. Connect the output terminals L, N, and PE of the AC charging pile low-power equivalent full-load test aging device to the corresponding terminals of the charging pile respectively. 3. Insert the charging gun head of the charging pile into the special socket of the AC charging pile low power equivalent full load test aging device; 4. Start the charging station; 5. The AC charging pile low-power equivalent full-load test aging device detects a control signal input to the charging pile and analyzes the maximum output power of the charging pile. 6. The AC charging pile low-power equivalent full-load test aging device detects that the charging pile has a valid signal input and closes the S2 switch; 7. The charging pile automatically closes the relay, causing the current L and N circuits to close respectively; 8. The AC charging pile low power equivalent full load test aging device controls the input transformer to increase from 0 current to the maximum power output current of the charging pile. 9. The charging station is operating at full power. 10. After the charging pile completes the predetermined aging time, the data is sent to the AC charging pile low power equivalent full load test aging device with 100% duty cycle PWM. 11. After the AC charging pile low-power equivalent full-load test aging device automatically reduces the current to the minimum, it turns on switch S2. 12. Automatically test whether the charging pile responds correctly to the relay opening time.

[0036] The charging pile is connected to the testing device, which initiates the charging pile startup, simulates the conditions for a car's response, automatically guides the charging pile's output relay to close, and then detects the charging pile's maximum output current. The low-voltage excitation control current gradually increases from a small current to full current, with a constant current output of 8 / 16 / 32 / 50A or any current required by the charging pile. The charging pile is then subjected to an equivalent full load, completing all simulated car charging conditions for testing and aging. Through these aging steps, batch aging tests of charging piles can be conveniently performed; it is simple and easy to use.

[0037] Reference Figure 1 and Figure 2 This invention describes a low-power equivalent full-load test aging device for AC charging piles according to a second aspect of this application. The device includes: a low-resistance closed-loop circuit, an adjustable power frequency low-voltage access circuit, a constant current control output circuit, and an internal current acquisition circuit for the charging pile. The low-resistance closed-loop circuit is connected to the adjustable power frequency low-voltage access circuit and the constant current control output circuit. The constant current control output circuit is connected to the internal current acquisition circuit for the charging pile. The low-resistance closed-loop circuit is used to preset a rated resistance value. The adjustable power frequency low-voltage access circuit is used to preset a rated power frequency input voltage to provide the aging test voltage input. The constant current control output circuit is used to output a rated aging test current to the charging gun. The internal current acquisition circuit for the charging pile is used to acquire the actual aging current of the charging pile. Using this device, aging is performed according to the method of the first aspect, enabling batch aging tests on charging piles.

[0038] In this embodiment, the low-resistance closed-loop circuit is composed of a charging pile input cable, a charging gun output cable, a standard relay, and PCB copper foil. The charging pile input cable and the charging gun output cable are 6mm² copper wires with a total length of 6 meters. The total resistance of the charging pile input cable and the charging gun output cable is 0.025Ω. The length of the PCB copper foil does not exceed 10cm, and the total resistance of the circuit is 0.015Ω.

[0039] In this embodiment, an adjustable low-voltage power frequency excitation unit is used as an adjustable low-voltage power frequency excitation unit. The adjustable low-voltage power frequency excitation unit outputs a continuously adjustable low-voltage power frequency of 0V to 3V, which is connected to a low-resistance closed-loop circuit. The constant current control unit realizes adjustable output of constant current self-adaptive charging pile control such as 8A, 16A, 32A, and 50A. In some implementations, a circuit for implementing this device is provided; please refer to [reference needed]. Figure 5 This is a circuit schematic diagram of an embodiment of this application.

[0040] This embodiment includes a power supply circuit, a motor drive circuit, a load circuit, a control circuit, a CPLT detection circuit, and a current detection circuit. The power supply circuit provides the necessary power to each component. The load circuit consists of a voltage regulator, an L transformer, an N transformer, a motor, and a magnetic ring. The outputs of the L and N transformers are connected to the L input and output terminals and the N input and output terminals of the charging pile, respectively, outputting an adjustable low-voltage power supply to the charging pile, thus achieving the function of an adjustable low-voltage power supply access circuit. The current detection circuit is used to detect the internal current of the charging pile. The control circuit and the CPLT detection circuit are used for testing and controlling the charging pile and achieving constant current control output.

[0041] The charging pile's internal current is sampled using a current detection circuit to collect the actual loop current. The full-load output state is then determined using the rated 220V voltage as an equivalent, achieving low-power equivalent full-load aging and simulating the actual working state.

[0042] The constant current control unit is composed of a control circuit and a CPLT detection circuit. The required excitation voltage for the constant current control unit to output a current of 32A is about 0.63V, and the circuit power loss is about 20W. The required excitation voltage for the constant current control unit to output a current of 50A is no more than 1V, and the circuit power loss is no more than 50W.

[0043] As a preferred embodiment, the low-resistance closed-loop circuit may include a 40A national standard relay and a PCB copper foil with a length not exceeding 10cm, so that the actual overall circuit resistance of the low-resistance closed-loop circuit is controlled between 0.015Ω and 0.025Ω.

[0044] As a preferred embodiment, the adjustable power frequency low voltage input circuit excitation voltage starts from 0V, and the constant current control output circuit is made into an output current adjustment execution control board for current closed-loop control, which can stably output multiple levels of test current such as 8A, 16A, 32A, and 50A.

[0045] As a preferred embodiment, the internal current acquisition circuit of the charging pile can be made into a core detection and output control board for output current feedback detection.

[0046] As a preferred embodiment, the low-resistance closed loop can be formed by connecting the charging pile input line, the charging gun line, the relay, and the PCB copper foil in series. For example, the charging pile input cable and the charging gun output cable can be selected with a total length of 6m of 6mm² copper wire, and the total resistance of the low-resistance closed loop is set to 0.02Ω.

[0047] In this embodiment, the adjustable low-voltage input circuit excitation voltage U can be adjusted from 0V to 3V, and the constant current control output circuit output current is controlled to be 8A / 16A / 32A / 50A. The aging test power P is calculated as follows: When the output current of the constant current control output circuit is 32A, the excitation voltage of the input circuit is U≈0.63V, and the aging test power is P≈20W; when the output current of the constant current control output circuit is 50A, the excitation voltage of the input circuit is U≈0.99V, and the aging test power is P≈49.5W.

[0048] The charging pile is identified as fully loaded based on 220V×I equivalent, achieving true current aging with almost no additional energy consumption.

[0049] As a preferred embodiment, when using this aging device, the charging pile input is connected to the device's power grid terminal, and the charging gun is connected to the device's test terminal charging gun port. The test device is connected to the power grid in parallel with the charging pile. A power frequency transformer can be selected as an adjustable power frequency low voltage excitation unit. The power frequency transformer outputs an adjustable low voltage of 0-3V and is synchronously connected to the input terminal of the charging pile. The LN lines must not be reversed. The constant current control board in the test device measures the PWM duty cycle of the charging gun control guide of the charging pile, calculates the maximum output current according to the charging pile standard, and the constant current control board automatically and gradually increases the current to the target value from the minimum current. The charging pile identifies the charging gun output as rated full load, tests the heat characteristics of the input and output physical connections of the charging pile equipment under full load, and tests other synchronous tests performed by the test device according to the standard. The test is then run for a set time to complete the verification test or aging. The actual power loss of this device is only 20-50W throughout the entire process, with no high heat generation and no need for a high-power load.

[0050] This solution has the following beneficial effects: 1. Extreme energy saving: Compared with traditional aging test schemes, which use electronic loads and have an aging power of several kW, this scheme uses low excitation voltage and constant current control output circuit to output large current, with an aging test power of tens of watts, resulting in energy savings of >99%.

[0051] 2. Authentic and Effective: By collecting the actual charging current inside the charging pile, the rated high current is output back to the charging pile power circuit under constant current control, providing a true high current testing effect.

[0052] 3. Full range coverage: Depending on the rated current of the charging gun, the constant current output circuit can be selected to output 8A, 16A, 32A, and 50A test current, achieving full coverage of the standard charging gun charging current.

[0053] 4. Voltage safety: It adopts low-voltage power frequency excitation voltage. During the test, the excitation voltage can be set to <1V throughout, which is far below the national standard test excitation voltage upper limit of 3V.

[0054] 5. By using the current execution control board, core detection and output control board, and the testing methods in this solution, a full range of interoperability tests for charging piles can be completed simultaneously.

[0055] The AC charging pile low-power equivalent full-load test aging device according to the second aspect of the present invention has at least the following beneficial effects: The present invention adopts a low-voltage power frequency voltage input to a low-resistance closed loop, outputs test current to the charging pile through a constant current control output loop, and collects the actual current during the aging test through the charging pile's internal current acquisition loop to achieve the full-load aging test effect. This device has full current range, real large current equivalent full load, simulates the effect of car charging, has extremely low power consumption and low voltage safety, and can simultaneously complete all aspects of charging pile interoperability test effects.

[0056] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0057] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A low-power equivalent full-load test aging method for AC charging piles, characterized in that, include: The method comprises a low-resistance closed-loop circuit, an adjustable power frequency low-voltage access circuit, a constant current control output circuit, and an internal current acquisition circuit for the charging pile. The low-resistance closed-loop circuit is connected to the adjustable power frequency low-voltage access circuit and the constant current control output circuit. The constant current control output circuit is connected to the internal current acquisition circuit for the charging pile. The method steps include: Set the total resistance of the low-resistance closed-loop circuit to the rated value; Input the rated adjustable power frequency voltage to the low-impedance closed-loop circuit; Set the test current of the constant current control output circuit to the rated value; Collect the actual current of the charging pile, calculate the power based on the rated voltage of 220V, and enter the full-load aging state. Maintain the constant current control output circuit set current to complete full-load aging.

2. The low-power equivalent full-load test aging method for AC charging piles according to claim 1, characterized in that, The rated input power frequency voltage is 0~3V.

3. The low-power equivalent full-load test aging method for AC charging piles according to claim 1, characterized in that, The rated value of the test current of the constant current control output circuit can be set to: 8A, 16A, 32A, 50A.

4. The low-power equivalent full-load test aging method for AC charging piles according to claim 1, characterized in that, The rated total resistance of the low-resistance closed-loop circuit is any value from 0.015Ω to 0.025Ω.

5. The method according to claim 3, characterized in that, When the rated test current of the constant current control output circuit is 32A, the input rated power frequency excitation voltage during aging is 0.63V, and the power consumption is 20.16W; when the rated test current of the constant current control output circuit is 50A, the input rated power frequency excitation voltage during aging is 1V, and the power consumption is 50W.

6. A low-power equivalent full-load aging test device for AC charging piles, characterized in that, include: The device comprises a low-resistance closed-loop circuit, an adjustable power frequency low-voltage access circuit, a constant current control output circuit, and an internal current acquisition circuit for the charging pile. The low-resistance closed-loop circuit is connected to the adjustable power frequency low-voltage access circuit and the constant current control output circuit. The constant current control output circuit is connected to the internal current acquisition circuit for the charging pile. The low-resistance closed-loop circuit is used to preset the rated resistance value. The adjustable power frequency low-voltage access circuit is used to preset the rated power frequency input voltage to provide the aging test voltage input. The constant current control output circuit is used to output the rated aging test current to the charging gun. The internal current acquisition circuit for the charging pile is used to acquire the actual aging current of the charging pile. The AC charging pile low-power equivalent full-load test aging test device executes the AC charging pile low-power equivalent full-load test aging method as described in claim 1.

7. The AC charging pile low-power equivalent full-load aging test device according to claim 6, characterized in that, The low-resistance closed-loop circuit consists of the charging pile input cable, the charging gun output cable, a standard relay, and PCB copper foil connected in series.

8. The AC charging pile low-power equivalent full-load aging test device according to claim 7, characterized in that, The charging pile input cable and the charging gun output cable are 6mm² copper wires, with a total length of 6 meters and a total circuit resistance of 0.025Ω.

9. The AC charging pile low-power equivalent full-load aging test device according to claim 7, characterized in that, The standard relay is a 40A national standard relay, the length of the PCB copper foil does not exceed 10cm, and the total circuit resistance is 0.015Ω.

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