Charger withstand voltage test device
By designing a charger voltage withstand voltage testing device that includes detection, analysis and warning modules, the problem that existing devices cannot detect multiple charging heads and inaccurate test results at the same time is solved, and efficient and accurate voltage withstand voltage testing of multiple chargers is achieved.
Patent Information
- Application Number
- CN202411853027.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-07
AI Technical Summary
The existing charger voltage test device cannot detect multiple charging heads at the same time, and the impact of environmental factors, equipment factors and the charger's own factors leads to inaccurate test results.
A charger voltage resistant test device is designed, including a voltage resistant tester and a test assembly. The test module includes a detection module, an analysis module and an alert module, which can collect and analyze data on factors affecting the environment, equipment and chargers, and issue warnings through the alert module to ensure the accuracy of the test results.
The compressive resistance of multiple chargers is realized at one time, which improves the practicality and accuracy of the test, avoids misjudgment of environmental factors and equipment factors, and judges the degree of damage of the charger to ensure the reliability of the test.
Smart Images
Figure CN119575105A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of testing devices, and in particular to a charger withstand voltage testing device. Background Art
[0002] The withstand voltage test of a charger is an important safety test used to ensure that the charger can maintain its insulation performance and function unaffected under conditions higher than the normal operating voltage. The withstand voltage test usually requires applying an AC voltage of up to 3kv to 4kv to the charger for one minute to verify whether its insulation material can withstand such high voltage without leakage or breakdown. The main purpose of the withstand voltage test is to verify the insulation performance of the charger and ensure that it can operate safely under extreme conditions. Through the withstand voltage test, the safety and reliability of the charger can be effectively evaluated to ensure that it can work stably in various environments. Existing equipment does not have the ability to detect multiple charging heads simultaneously; In the prior art, when conducting a withstand voltage test on a charger, the interference of influencing factors is mostly considered. In terms of environmental factors, abnormal temperature and humidity may change the performance of the insulating material, and electromagnetic interference may affect the accuracy of the test voltage, thereby leading to misjudgment of the test results. In terms of equipment factors, insufficient accuracy of the test instrument may lead to inaccurate applied voltage, and loose electrodes may change the contact resistance, causing local overheating and affecting the actual withstand voltage performance of the charger. In terms of the charger itself, internal damage and aging may reduce the insulation performance and reduce the withstand voltage value that the charger can withstand. All these may make the withstand voltage test results unable to truly reflect the insulation and safety performance of the charger, leading to an erroneous assessment of the charger quality. Therefore, the present invention improves the existing equipment in view of the above problems. Summary of the invention
[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a charger withstand voltage test device.
[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a charger voltage test device, comprising a voltage tester, two double-ended wires are plugged into the connection port on the front end surface of the voltage tester, a row test box is provided on the top surface of the voltage tester, one side of the row test box is plugged into the connection port on the side of the voltage tester through a single-ended wire, and a row test component is provided in the row test box; The test component also includes a detection module, an analysis module and a warning module; The detection module collects environmental influencing factors, equipment influencing factors and charger influencing factors respectively, and transmits the collected data to the analysis module; The analysis module analyzes and processes the data transmitted by the detection module, generates a corresponding warning signal according to the processing result, and transmits the warning signal to the warning module; The warning module issues a corresponding warning reminder according to the corresponding warning signal.
[0005] Preferably, support columns are fixedly connected to both sides of the rear end of the bottom surface of the row test box, and the bottom ends of the support columns are fixedly connected to the top surface of the withstand voltage tester.
[0006] Preferably, the row test component comprises a row test box, a plurality of partitions are vertically fixed inside the row test box, an opening is provided on the back of the row test box, a USB plug board is hinged on one side of the opening, and a limit strip is installed on the other side of the opening by bolts.
[0007] Preferably, a through hole is provided on one side of the row test box to cooperate with the single-head wire, the single-head wire is fixedly connected to the power board, the power board is embedded in the side wall of the row test box, contacts are provided on both sides of the power board, and the contacts pass through the partition of the row test box.
[0008] Preferably, a conductive plate is installed on the front end surface of the USB plug board, the conductive plate is embedded inside the USB plug board, one side of the conductive plate abuts against the contact on one side of the power board, and a plurality of USB plugs are equidistantly installed and connected in front of the conductive plate, and the USB plugs pass through the USB plug board.
[0009] Preferably, the contact on the other side of the power board is connected to a socket board, and the socket board is provided with a plurality of sockets, and the sockets are aligned with the USB plug.
[0010] Preferably, the analysis module analyzes environmental influencing factors in the following steps: Step 1: Get n identical chargers, test the withstand voltage values of the chargers with a test instrument at different temperatures, draw the corresponding coordinate points of the test data on the horizontal axis of the withstand voltage data, preset the fluctuation range of the withstand voltage data, draw a circle with the coordinate point as the center and the length of the fluctuation range as the radius, and then count the circles that do not intersect with other circles, recorded as m. If m>n / 5, it is determined that there are many data anomalies and the test data is inaccurate, and the data test operation is repeated; Step 2: On the contrary, the withstand voltage data corresponding to the intersecting circles are averaged and recorded as the withstand voltage data at the corresponding temperature; the temperature data T and the withstand voltage data Uw have the following relationship: Uw=Uo*[1-k1*(T-To)], where Uo is the withstand voltage data of the charger at the reference temperature To, and k1 is a coefficient related to temperature; substitute the withstand voltage data corresponding to different temperatures into the relationship between the temperature data T and the withstand voltage data Uw, and calculate the specific value of k1; Step 3: Obtain the withstand voltage data of the charger under different humidity conditions, and substitute the obtained data into the relationship between humidity data H and withstand voltage data Uh, Uh=Uo*[1-k2*H], and calculate the specific value of k2; substitute the withstand voltage data Ud of the charger under different electromagnetic interference C into the formula, Ud=k3*C, and calculate the specific value of k3; Step 4: Consider the withstand voltage data of the charger under the interference of three factors, the fluctuation caused by temperature and humidity on the withstand voltage of the charger, Uwh=Uo*[1-k1*(T-To)]*[1-k2*H], and then consider the fluctuation caused by electromagnetic interference factors, U1=Uwh-Ud; compare the calculated withstand voltage data with the detected withstand voltage data, subtract one from the ratio of the two withstand voltage data, and take the absolute value, and compare the absolute value with the preset comparison threshold value one. If the absolute value is greater than the preset comparison threshold value one, it is determined that the detected withstand voltage data is inaccurate, and the detected withstand voltage data is replaced with the calculated withstand voltage data; otherwise, it is determined that there is no impact.
[0011] Preferably, the analysis module analyzes the factors affecting the device and the charger in the following steps: Step 1: Repeat the measurement of the same standard charger N times to obtain the repeatability data of the charger, calculate the mean of the repeatability data, record it as the mean of the repeatability data, then sum the squares of the differences between the N repeatability data and the mean of the repeatability data, and divide it by N-1 to obtain the standard deviation of the repeatability data. The ratio of the standard deviation to the mean of the repeatability data is recorded as the repeatability error. If the repeatability error is greater than the preset comparison threshold 2, it is determined that the instrument accuracy is low, and the repeatability error is recorded as the instrument accuracy error Uc; compare the actual applied voltage with the instrument detection voltage. If the actual applied voltage Ut is greater than the instrument detection voltage, it is determined that the instrument accuracy is too small, and the actual applied voltage is adjusted to Uj=(1+Uc)*Ut; if the instrument accuracy is too large, the actual applied voltage is adjusted to Uj=(1-Uc)*Ut; Step 2: Assume that the contact resistance of the electrodes when in normal contact is Ro. When the electrodes are loose, the contact resistance becomes R1, R1>Ro. Assume that the coefficient of dielectric strength reduction of the insulating material due to local overheating is k4, k4=R1 / Ro. The relationship between the withstand voltage Us that the charger can actually withstand and the withstand voltage Uq that it can withstand under normal circumstances is Us= *Uq, then the withstand voltage data fluctuation caused by instrument accuracy and electrode looseness is U2=Uj-Us; Step 3: If the absolute value of the difference between data 1 and the ratio of the withstand voltage data U2 to the detected withstand voltage data is greater than a preset comparison threshold 1, it is determined that the electrode is loose, a loose warning signal is generated, and the loose warning signal is transmitted to the warning module; Step 4: The degree of damage can be referenced by the ratio of the insulation resistance, dielectric strength and capacitance parameters before and after the change. The ratios before and after the change are calculated and recorded as b1, b2 and b3. The weights of the insulation resistance, dielectric strength and capacitance parameters are preset as w1, w2 and w3 respectively. The comprehensive damage and aging degree of the charger is D=w1*(1-b1)+w2*(1-b2)+w3*(1-b3). The relationship between the charger withstand voltage Uf and the damage and aging degree D is Uf=D*Uq. Step 5: If the damage degree D is greater than the preset damage threshold, it is determined that the damage degree of the charger cannot be detected, a replacement warning signal is generated, and the replacement warning signal is transmitted to the warning module.
[0012] Preferably, the warning module performs the following operations to warn: Step 1: After receiving the loosening warning signal, the buzzer set on the test assembly will sound to remind the operator that the electrode is loose; Step 2: After receiving the replacement warning signal, the buzzer and red lamp beads set on the test component are used for warning. The buzzer beeps and the red lamp lights up to remind the operator that the damage and aging of the charger seriously affect the detection.
[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the cooperation of the withstand voltage tester and the double-headed wire, it is convenient to test the charger separately, and through the cooperation of the withstand voltage tester and the row test component, it is convenient to test the pressure resistance of multiple chargers at the same time, which improves the practicality and realizes the ability of the device to test multiple chargers at one time; it solves the problem that the device cannot test multiple charging heads at the same time; 2. The detection module, analysis module and warning module are used to analyze and process the influencing factors of the environment, equipment and charger itself respectively. The comprehensive fluctuations of temperature, humidity and electromagnetic interference on the withstand voltage data are considered, compared with the detection data and corrected to make the withstand voltage test data more accurate and avoid misjudgment caused by environmental factors. The influence of electrode looseness on withstand voltage is considered, the looseness of the electrode is judged and warned to ensure the accuracy of the test voltage and eliminate the interference of equipment factors on the test results. It is judged whether the degree of damage to the charger affects the detection, and a replacement warning is issued when necessary to ensure that the tested charger is in normal condition and improve the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a three-dimensional schematic diagram of the overall appearance of the device proposed by the present invention; Figure 2This is a schematic front view of the overall appearance of the device proposed by the present invention; Figure 3 A schematic side view of the overall appearance of the device proposed by the present invention; Figure 4 A schematic top view of the row test assembly structure proposed by the present invention; Figure 5 It is a schematic back view of the row test assembly structure proposed by the present invention; Figure 6 This is a schematic top view of the structure of the power strip, USB plug board and power board proposed by the present invention; Figure 7 A three-dimensional schematic diagram of the USB plug board and power board structure proposed by the present invention; Figure 8 This is a three-dimensional schematic diagram of the structure of the power strip and the power board proposed by the present invention; Fig. 9 It is a system flow chart of the present invention.
[0015] Serial numbers in the figure: 1. Withstand voltage tester; 2. Double-ended wire; 3. Test box; 4. Support column; 5. Single-ended wire; 6. USB plug board; 7. Limit strip; 8. USB plug; 9. Power board; 10. Plug board. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0017] Example: See Figure 1-9 A charger voltage test device in the present invention comprises a voltage tester 1, two double-ended wires 2 are plugged into the connection port on the front end face of the voltage tester 1, a row test box 3 is arranged on the top face of the voltage tester 1, one side of the row test box 3 is plugged into the connection port on the side face of the voltage tester 1 through a single-ended wire 5, a row test assembly is arranged in the row test box 3, through the cooperation of the voltage tester 1 and the double-ended wire 2, it is convenient to detect the charger separately, thereby improving practicality; support columns 4 are fixedly connected to both sides of the rear end of the bottom face of the row test box 3, the bottom end of the support column 4 is fixedly connected to the top face of the voltage tester 1, the row test assembly comprises the row test box 3, a plurality of partitions are vertically fixedly connected inside the row test box 3, an opening is opened on the back face of the row test box 3, a USB plug board 6 is hingedly connected to one side of the opening, a limit strip 7 is installed on the other side of the opening through bolts, through the cooperation of the USB plug board 6 and the limit strip 7, the USB plug board 6 is convenient to be fixed, thereby improving practicality.
[0018] The test component also includes a detection module, an analysis module and a warning module; Environmental factors include temperature, humidity and electromagnetic interference. Obtain n identical chargers, test the withstand voltage values of the chargers with test instruments at different temperatures, and arrange the withstand voltage data in ascending order of temperature. Perform abnormality removal on the multiple withstand voltage data detected at each temperature, draw the corresponding data size coordinate points on the horizontal axis of the withstand voltage data, preset the fluctuation range of the withstand voltage data, draw a circle with the coordinate point as the center and the length of the fluctuation range as the radius, and then count the circles that do not intersect with other circles, recorded as m. If m>n / 5 , it is determined that there are many abnormal data and the detection data is inaccurate, and the data detection operation is repeated; otherwise, the mean of the withstand voltage data corresponding to the intersecting circles is calculated, and the calculated mean is recorded as the withstand voltage data at the corresponding temperature; the temperature data T and the withstand voltage data Uw have the following relationship, Uw=Uo*[1-k1*(T-To)], Uo is the withstand voltage data of the charger at the reference temperature To, and k1 is the coefficient related to temperature; the withstand voltage data corresponding to different temperatures are substituted into the relationship between the temperature data T and the withstand voltage data Uw, and the specific value of k1 is calculated; Establish the same test, obtain the withstand voltage data of the charger under different humidity, and substitute the obtained data into the relationship between humidity data H and withstand voltage data Uh, Uh=Uo*[1-k2*H], and calculate the specific value of k2; substitute the withstand voltage data Ud of the charger under different electromagnetic interference C into the formula, Ud=k3*C, and calculate the specific value of k3; The withstand voltage data of the charger under the interference of three factors are considered. First, the fluctuations of the withstand voltage of the charger caused by temperature and humidity are considered comprehensively, Uwh=Uo*[1-k1*(T-To)]*[1-k2*H], and then the fluctuations caused by electromagnetic interference factors are considered, U1=Uwh-Ud; the calculated withstand voltage data is compared with the detected withstand voltage data, the ratio of the two withstand voltage data is reduced by one, and the absolute value is taken, and the absolute value is compared with the preset comparison threshold value one. If the absolute value is greater than the preset comparison threshold value one, it is determined that the detected withstand voltage data is inaccurate, and the detected withstand voltage data is replaced by the calculated withstand voltage data; otherwise, it is determined that there is no impact.
[0019] Equipment influencing factors include instrument accuracy and electrode looseness; repeat measurements are performed on the same standard charger N times to obtain the repeatability data of the charger, the mean of the repeatability data is calculated, and recorded as the mean of the repeatability data. The squares of the differences between the N repeatability data and the mean of the repeatability data are summed and divided by N-1 to obtain the standard deviation of the repeatability data. The ratio of the standard deviation to the mean of the repeatability data is recorded as the repeatability error. If the repeatability error is greater than the preset comparison threshold value 2, the instrument accuracy is judged to be low, and the repeatability error is recorded as the instrument accuracy error Uc; the actual applied voltage is compared with the instrument detection voltage. If the actual applied voltage Ut is greater than the instrument detection voltage, the instrument accuracy is judged to be too small, and the actual applied voltage is adjusted to Uj=(1+Uc)*Ut; if the instrument accuracy is too large, the actual applied voltage is adjusted to Uj=(1-Uc)*Ut; Assume that the contact resistance of the electrodes when in normal contact is Ro. When the electrodes are loose, the contact resistance becomes R1, R1>Ro. The local overheating caused by the loose electrodes will affect the temperature around the charger, and then affect the performance of the insulating material. Assume that the coefficient of the dielectric strength of the insulating material decreased due to local overheating is k4, k4=R1 / Ro. The relationship between the actual withstand voltage Us that the charger can withstand and the withstand voltage Uq that it can withstand under normal circumstances is Us= *Uq, the fluctuation of withstand voltage data caused by instrument accuracy and electrode looseness is U2=Uj-Us; if the absolute value of the difference between data 1 and the ratio of withstand voltage data U2 and the detected withstand voltage data is greater than the preset comparison threshold 1, it is determined that the electrode is loose, a loose warning signal is generated, and the loose warning signal is transmitted to the warning module.
[0020] Factors affecting the charger include equipment damage and aging. When the charger is damaged and aged, the values of the insulation resistance, dielectric strength and capacitance parameters will change. The degree of damage can be referenced by the ratio of the insulation resistance, dielectric strength and capacitance parameters before and after the change. The ratios before and after the change are calculated and recorded as b1, b2 and b3. The weights of the insulation resistance, dielectric strength and capacitance parameters are preset as w1, w2 and w3 respectively. The comprehensive degree of damage and aging of the charger is D=w1*(1-b1)+w2*(1-b2)+w3*(1-b3). The relationship between the charger withstand voltage Uf and the degree of damage and aging D is Uf=D*Uq. If the degree of damage D is greater than the preset damage threshold, it is determined that the degree of damage to the charger cannot be detected, a replacement warning signal is generated, and the replacement warning signal is transmitted to the warning module.
[0021] If after separate judgment of the three factors of environmental influence, equipment influence and charger influence, it is determined that the three factors have little impact on the withstand voltage data, then a comprehensive impact judgment is made, and the weight coefficients of the three factors are preset, recorded as r1, r2 and r3. The comprehensive impact withstand voltage data UZ=r1*U1+r2*U2+r3*Uf, if the value of |1-UZ / Uq| is greater than the preset comparison threshold three, it is determined that the data fluctuation is large, and the data is re-tested; otherwise, the tested withstand voltage data is exported.
[0022] In the present invention, a through hole is opened on one side of the test box 3 to cooperate with the single-head wire 5, and the single-head wire 5 is fixedly connected to the power board 9, which is embedded in the side wall of the test box 3. Contacts are provided on both sides of the power board 9, and the contacts pass through the partition of the test box 3. A conductive plate is installed on the front end surface of the USB plug board 6, and the conductive plate is embedded in the USB plug board 6. One side of the conductive plate abuts against the contacts on one side of the power board 9. A plurality of USB plugs 8 are equidistantly installed and connected in front of the conductive plate, and the USB plugs 8 pass through the USB plug board 6. The contacts on the other side of the power board 9 are connected to the plug board 10, and the plug board 10 is provided with a plurality of sockets, and the sockets are aligned with the USB plugs 8. Through the cooperation of the withstand voltage tester 1 and the test assembly, it is convenient to simultaneously detect the pressure resistance of multiple chargers, thereby improving practicality.
[0023] Working principle: When the present invention is used, first power is supplied to the withstand voltage tester 1. When only one charger needs to be tested, the two double-headed wires 2 can be directly connected to the charger and the withstand voltage tester 1 to perform a withstand voltage test. When multiple charging heads need to be tested, first adjust the limit bar 7 to a vertical position, thereby rotating and opening the USB plug board 6, and then push the charger between the partitions, insert the pins on the charger into the sockets on the strip board 10, and then rotate and close the USB plug board 6, adjust the limit bar 7 to an angle, thereby fixing the USB plug board 6, and while closing the USB plug board 6, the USB plug 8 on the USB plug board 6 is naturally plugged into the USB socket of the charger to form a current path, and finally start the withstand voltage tester 1 to test the charger through the single-headed wire 5 and receive data.
[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A charger withstand voltage test device, comprising a withstand voltage tester (1), characterized in that: Two double-ended wires (2) are plugged into the connection port on the front end of the withstand voltage tester (1); a row test box (3) is provided on the top surface of the withstand voltage tester (1); one side of the row test box (3) is plugged into the connection port on the side of the withstand voltage tester (1) via a single-ended wire (5); and a row test component is provided in the row test box (3); The test component also includes a detection module, an analysis module and a warning module; The detection module collects environmental influencing factors, equipment influencing factors and charger influencing factors respectively, and transmits the collected data to the analysis module; The analysis module analyzes and processes the data transmitted by the detection module, generates a corresponding warning signal according to the processing result, and transmits the warning signal to the warning module; The warning module issues a corresponding warning reminder according to the corresponding warning signal.
2. A charger withstand voltage test device according to claim 1, characterized in that: Support columns (4) are fixedly connected to both sides of the rear end of the bottom surface of the row test box (3), and the bottom ends of the support columns (4) are fixedly connected to the top surface of the withstand voltage tester (1).
3. A charger withstand voltage test device according to claim 2, characterized in that: The row test assembly comprises a row test box (3), a plurality of partitions are vertically fixed inside the row test box (3), an opening is provided on the back of the row test box (3), a USB plug board (6) is hingedly connected to one side of the opening, and a limit strip (7) is installed on the other side of the opening via bolts.
4. A charger withstand voltage test device according to claim 3, characterized in that: A through hole is provided on one side of the row test box (3) to match the single-end wire (5); the single-end wire (5) is fixedly connected to a power connection board (9); the power connection board (9) is embedded in the side wall of the row test box (3); contacts are provided on both sides of the power connection board (9); the contacts penetrate the partition of the row test box (3).
5. A charger withstand voltage test device according to claim 3, characterized in that: A conductive plate is installed on the front end surface of the USB plug board (6), the conductive plate is embedded in the USB plug board (6), one side of the conductive plate abuts against a contact point on one side of the power board (9), and a plurality of USB plugs (8) are installed and connected at equal intervals in front of the conductive plate, and the USB plugs (8) penetrate the USB plug board (6).
6. A charger withstand voltage test device according to claim 5, characterized in that: The contact point on the other side of the power board (9) is connected to a socket board (10), and the socket board (10) is provided with a plurality of sockets, and the sockets are aligned with the USB plug (8).
7. A charger withstand voltage test device according to claim 1, characterized in that: The analysis steps of the analysis module for environmental impact factors are as follows: Step 1: Get n identical chargers, test the withstand voltage values of the chargers with a test instrument at different temperatures, draw the corresponding coordinate points of the test data on the horizontal axis of the withstand voltage data, preset the fluctuation range of the withstand voltage data, draw a circle with the coordinate point as the center and the length of the fluctuation range as the radius, and then count the circles that do not intersect with other circles, recorded as m. If m>n / 5, it is determined that there are many data anomalies and the test data is inaccurate, and the data test operation is repeated; Step 2: On the contrary, the withstand voltage data corresponding to the intersecting circles are averaged and recorded as the withstand voltage data at the corresponding temperature; the temperature data T and the withstand voltage data Uw have the following relationship: Uw=Uo*[1-k1*(T-To)], where Uo is the withstand voltage data of the charger at the reference temperature To, and k1 is a coefficient related to temperature; substitute the withstand voltage data corresponding to different temperatures into the relationship between the temperature data T and the withstand voltage data Uw, and calculate the specific value of k1; Step 3: Obtain the withstand voltage data of the charger under different humidity conditions, and substitute the obtained data into the relationship between humidity data H and withstand voltage data Uh, Uh=Uo*[1-k2*H], and calculate the specific value of k2; substitute the withstand voltage data Ud of the charger under different electromagnetic interference C into the formula, Ud=k3*C, and calculate the specific value of k3; Step 4: Consider the withstand voltage data of the charger under the interference of three factors, the fluctuation caused by temperature and humidity on the withstand voltage of the charger, Uwh=Uo*[1-k1*(T-To)]*[1-k2*H], and then consider the fluctuation caused by electromagnetic interference factors, U1=Uwh-Ud; compare the calculated withstand voltage data with the detected withstand voltage data, subtract one from the ratio of the two withstand voltage data, and take the absolute value, and compare the absolute value with the preset comparison threshold value one. If the absolute value is greater than the preset comparison threshold value one, it is determined that the detected withstand voltage data is inaccurate, and the detected withstand voltage data is replaced with the calculated withstand voltage data; otherwise, it is determined that there is no impact.
8. A charger withstand voltage test device according to claim 7, characterized in that: The analysis module analyzes the factors affecting the device and charger as follows: Step 1: Perform N repeated measurements on the same standard charger to obtain the repeatability data of the charger, calculate the mean of the repeatability data, record it as the mean of the repeatability data, then sum the squares of the differences between the N repeatability data and the mean of the repeatability data, and divide it by N-1 to obtain the standard deviation of the repeatability data. The ratio of the standard deviation to the mean of the repeatability data is recorded as the repeatability error. If the repeatability error is greater than the preset comparison threshold value 2, it is determined that the instrument accuracy is low, and the repeatability error is recorded as the instrument accuracy error Uc; compare the actual applied voltage with the instrument detection voltage. If the actual applied voltage Ut is greater than the instrument detection voltage, it is determined that the instrument accuracy is too small, and the actual applied voltage is adjusted to Uj=(1+Uc)*Ut; If the accuracy of the instrument is too large, adjust the actual applied voltage to Uj=(1-Uc)*Ut; Step 2: Assume that the contact resistance of the electrodes when in normal contact is Ro. When the electrodes are loose, the contact resistance becomes R1, R1>Ro. Assume that the coefficient of dielectric strength reduction of the insulating material due to local overheating is k4, k4=R1 / Ro. The relationship between the withstand voltage Us that the charger can actually withstand and the withstand voltage Uq that it can withstand under normal circumstances is Us= *Uq, then the withstand voltage data fluctuation caused by instrument accuracy and electrode looseness is U2=Uj-Us; Step 3: If the absolute value of the difference between data 1 and the ratio of the withstand voltage data U2 to the detected withstand voltage data is greater than a preset comparison threshold 1, it is determined that the electrode is loose, a loose warning signal is generated, and the loose warning signal is transmitted to the warning module; Step 4: The degree of damage can be referenced by the ratio of the insulation resistance, dielectric strength and capacitance parameters before and after the change. The ratios before and after the change are calculated and recorded as b1, b2 and b3. The weights of the insulation resistance, dielectric strength and capacitance parameters are preset as w1, w2 and w3 respectively. The comprehensive damage and aging degree of the charger is D=w1*(1-b1)+w2*(1-b2)+w3*(1-b3). The relationship between the charger withstand voltage Uf and the damage and aging degree D is Uf=D*Uq. Step 5: If the damage degree D is greater than the preset damage threshold, it is determined that the damage degree of the charger cannot be detected, a replacement warning signal is generated, and the replacement warning signal is transmitted to the warning module.
9. A charger withstand voltage test device according to claim 8, characterized in that: The warning module performs the following operations: Step 1: After receiving the loosening warning signal, the buzzer set on the test assembly will sound to remind the operator that the electrode is loose; Step 2: After receiving the replacement warning signal, the buzzer and red lamp beads set on the test component are used for warning. The buzzer beeps and the red lamp lights up to remind the operator that the damage and aging of the charger seriously affect the detection.