Electric leakage detection method based on vehicle-mounted charging

Abstract

The invention discloses an electric leakage detection method based on vehicle-mounted charging, and relates to the technical field of electric leakage detection, and the method comprises the steps: setting voltage detection points at two sides of each electrical element, selecting one voltage detection point as a central point, obtaining an electrical element adjacent to the central point, marking the voltage detection point in the middle as an equipotential point, and carrying out the detection of the equipotential point. The method comprises the following steps: acquiring an environment of a vehicle-mounted charging circuit to obtain an equipotential set, detecting the environment of the vehicle-mounted charging circuit in real time to obtain a data acquisition signal, acquiring and calculating detection data on an environment detector according to the data acquisition signal to obtain an electric leakage factor, comparing the electric leakage factor with a threshold value to obtain an electric leakage signal, and when the electric leakage signal is detected, judging whether the electric leakage signal is abnormal or not. The voltage of the voltage detection points corresponding to the elements in the equipotential set is collected and compared to obtain the position of the leakage current, and the electric leakage position is obtained by detecting the potential, so that accurate positioning is realized, and accidents caused by the fact that some hidden electric leakage places or paths are not detected are prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of leakage detection, and in particular to a leakage detection method based on vehicle-mounted charging. Background Art

[0002] The invention with patent publication number CN116593931A discloses a leakage detection method, circuit and vehicle charger for AC power supply. In response to the user's power-on action for AC power supply, a first sampling signal is obtained, and the first sampling signal includes the sampling signal of the first sampling point and the sampling signal of the second sampling point; the first sampling signal is impedance matched and hardware filtered to obtain the second sampling signal; the second sampling signal is software filtered to obtain the third sampling signal, and the third sampling signal includes the voltage effective value and voltage peak value of the first sampling point and the voltage effective value and voltage peak value of the second sampling point; when the deviation between the voltage effective value of the first sampling point and the voltage effective value of the second sampling point is greater than or equal to the preset voltage deviation threshold, it is confirmed that the AC power supply has leakage. Through the above method, this application solves the problem that the leakage of AC power supply poses a hidden danger to the personal safety of users in the scenario of using AC power supply.

[0003] During the process of charging the device with on-board charging, the overall circuit is relatively complicated, and the leakage detection of on-board charging is generally performed in a fixed circuit. This may result in the inability to effectively detect some hidden parts or leakage paths, thus causing accidents. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a leakage detection method based on vehicle-mounted charging to solve the above-mentioned technical problem.

[0005] To achieve the above object, a leakage detection method based on vehicle charging is proposed according to an embodiment of the first aspect of the present invention. The method specifically comprises the following steps:

[0006] Step 1: First, according to the charging circuit diagram of the vehicle charging, a simulation circuit diagram is obtained, and the electrical components Ei in the simulation circuit diagram are obtained, i=1, 2, 3, ..., and voltage detection points Eia and Eib are set on both sides of each electrical component Ei respectively;

[0007] Step 2: Then, according to the position of the voltage detection point, a voltage detection point is taken as the center point, and the adjacent components are obtained, and all the voltage detection points between the center point and the adjacent components are marked as equipotential points to obtain an equipotential set;

[0008] Step 3: Perform real-time detection on the circuit environment of the on-board charger, and compare the detection value with the environmental standard range to obtain a data acquisition signal, and collect the detection data on the environmental detector according to the data acquisition signal, and process it to obtain a leakage factor, and then compare the leakage factor with the threshold to obtain a leakage signal;

[0009] Step 4: When a leakage signal is detected, an equipotential set is obtained, and the voltages of the voltage detection points in the equipotential set are detected respectively. When the detection voltage of an equipotential set is abnormal, it indicates that there is a leakage current. At the same time, the location of the leakage current is obtained according to the location of this equipotential set.

[0010] As a further embodiment of the present invention, electrical components refer to components such as resistors, capacitors, diodes, amplifiers and power supplies in a circuit.

[0011] As a further scheme of the present invention, the voltage detection points Eia and Eib are set on both sides of the electrical component Ei, and the relationship is that Eia is the high potential point of the electrical component i, Eib is the low potential point of the electrical component i, and the voltage of the high potential point minus the low potential point is the potential difference across the electrical component.

[0012] As a further solution of the present invention, a specific method for obtaining an equipotential set is:

[0013] S1: First obtain the positions of all electrical components in the simulation circuit diagram and the positions of the corresponding voltage detection points;

[0014] S2: select any electrical element Ei, first select its high potential point Eia as the center point, then obtain the electrical elements adjacent to the center point, and mark them as adjacent elements Ln, n = 1, 2, 3, ..., and n < i;

[0015] S3: Obtain the voltage detection points between the center point and all adjacent elements Ln, and mark them as equipotential points. At the same time, take the center point and all the equipotential points corresponding to it as elements of the equipotential set to obtain the equipotential set.

[0016] S4: Select other unmarked voltage detection points respectively, mark them as center points, and process them according to the above steps S2 to S3 to obtain several equipotential sets.

[0017] As a further solution of the present invention, the method for obtaining the leakage factor is:

[0018] ST1: An environment detection device is first set up in the environment where the on-board charging circuit is placed, wherein the environment detection device includes a temperature detector, a humidity detector and a dust detector;

[0019] ST2: Then, the corresponding environmental standard intervals are set in the environmental detector, and the environmental standard intervals include the temperature standard interval, the humidity standard interval and the dust standard interval;

[0020] ST3: The environmental detector monitors the environment of the vehicle charging location in real time. When all environmental detection values ​​are within the corresponding environmental standard range, the environmental detector will not collect and transmit the detection data. Otherwise, it will generate a data collection signal.

[0021] ST4: When the processor detects the data acquisition signal, the time when the data acquisition signal is detected is taken as the starting time, and the detection data on the environmental detector is collected every unit time t, and marked as temperature Tj, humidity Sj and dust value FCj, j = 1, 2, 3, ..., m, indicating that there are m groups of detection data, and j = 1 indicates the environmental detection data collected at the starting time;

[0022] ST5: Use the formula Lo = (Tj×λ1+Sj×λ2+FCj×λ3) α ×K to obtain the leakage factor Lo, where λ1, λ2 and λ3 are the corresponding influence coefficients, α is the correction factor, and K is the proportional coefficient.

[0023] As a further solution of the present invention, a method for obtaining a leakage signal is as follows:

[0024] When the leakage factor Lo is less than the threshold value Ly, the detection data of the next unit time is collected and calculated again. When the leakage factor Lo is greater than or equal to the threshold value Ly, a leakage signal is generated.

[0025] As a further solution of the present invention, a method for obtaining the leakage current and the location of the leakage current is:

[0026] When a leakage signal is detected, the voltage of the voltage detection point corresponding to the element in the equipotential set is collected to obtain the detection voltage, and the detection voltage is compared. When all the detection voltages in any equipotential set are completely consistent, the position where the detection point in this equipotential set is located is a normal circuit. On the contrary, when there is a detection voltage value in the equipotential set that is not completely consistent, it means that there is a leakage current at the position corresponding to this equipotential set.

[0027] When leakage current is detected, the power-off protection device will be activated immediately, interrupting the on-board charging circuit and transmitting the leakage signal to relevant personnel.

[0028] As a further solution of the present invention, a leakage sensor is also provided in the vehicle-mounted charging circuit. When the leakage sensor detects the presence of leakage current in the charging circuit, the specific position in the circuit will be detected according to the method in the above step four to obtain the specific position of the leakage fault, and the leakage signal will be transmitted to relevant personnel.

[0029] Compared with the prior art, the invention has the following beneficial effects: firstly, detection and calculation are performed according to environmental factors to obtain a leakage factor, and when the leakage factor is greater than a threshold, a leakage alarm is generated, and the leakage alarm is combined with the leakage sensor alarm. When one party issues an alarm message, the potential in the circuit is detected, thereby improving the accuracy and reliability of leakage fault detection;

[0030] When a leakage signal is generated, the potential of each equipotential point is detected to obtain the leakage position, achieving precise positioning, thereby preventing accidents caused by some hidden leakage locations or paths not being detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the system framework of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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 are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figure 1 The present application provides a method for detecting leakage of electric current based on vehicle charging, which specifically comprises the following steps:

[0035] Step 1: first obtain the charging circuit diagram of the vehicle charging, and model the vehicle circuit diagram in the simulation software to obtain a simulation circuit diagram. In this embodiment, the simulation software is selected as Protues, and then obtain the electrical components in the simulation circuit diagram, where the electrical components include resistors, capacitors, diodes and amplifiers, etc., and mark the electrical components as E1, E2, E3, ..., Ei, indicating that there are i electrical components in the simulation circuit diagram, and the electrical components include a power supply;

[0036] Step 2: Set voltage detection points on both sides of each electrical component, and mark each voltage detection point as Eia and Eib, where Eia is the high potential point of electrical component i, Eib is the low potential point of electrical component i, and the voltage of the high potential point minus the low potential point is the potential difference across the electrical component, that is, the voltage Ui across the electrical component Ei;

[0037] Step 3: According to the simulation circuit diagram, the voltage detection points in the circuit are divided into several equipotential sets. The specific method of dividing the voltage detection points is:

[0038] S1: First obtain the positions of all electrical components in the simulation circuit diagram and the positions of the corresponding voltage detection points;

[0039] S2: select any electrical element Ei, first select its high potential point Eia as the center point, then obtain the electrical elements adjacent to the center point, and mark them as adjacent elements Ln, n = 1, 2, 3, ..., and n < i;

[0040] S3: Obtain the voltage detection points between the center point and all adjacent elements Ln, and mark them as equipotential points. At the same time, take the center point and all the equipotential points corresponding to it as elements of an equipotential set, thereby obtaining an equipotential set. It should be noted that the voltage values ​​detected at the positions of the voltage detection points corresponding to all elements in the same equipotential set are the same value under normal circumstances.

[0041] S4: Select other unmarked voltage detection points respectively, mark them as center points, and process them according to the above steps S2 to S3, so as to obtain several equipotential sets;

[0042] Step 4: Then detect the circuit environment and process the detection data to obtain the leakage factor. The circuit environment includes the temperature, humidity and dust at the vehicle charging location. The specific detection method is as follows:

[0043] ST1: An environment detection device is first set up in the environment where the on-board charging circuit is placed, wherein the environment detection device includes a temperature detector, a humidity detector and a dust detector;

[0044] ST2: Then, corresponding environmental standard intervals are set in the environmental detector, and the environmental standard intervals include a temperature standard interval, a humidity standard interval, and a dust standard interval. In this embodiment, specific values ​​of the environmental standard intervals are set by staff in related fields according to actual conditions;

[0045] ST3: The environmental detector monitors the environment of the vehicle charging location in real time. When all environmental detection values ​​are within the corresponding environmental standard range, the environmental detector will not collect and transmit the detection data, reducing the transmission and processing process of the processor and avoiding wasting too many computing resources. On the contrary, when any environmental detection value is not within the corresponding environmental standard range, a data collection signal is generated.

[0046] ST4: When the processor detects the data acquisition signal, the time when the data acquisition signal is detected is taken as the starting time, and the detection data on the environmental detector is collected every unit time t, and marked as temperature Tj, humidity Sj and dust value FCj, j = 1, 2, 3, ..., m, indicating that there are m groups of detection data, and j = 1 indicates the environmental detection data collected at the starting time;

[0047] ST5: Use the formula Lo = (Tj×λ1+Sj×λ2+FCj×λ3) α ×K to obtain the leakage factor Lo, where λ1, λ2 and λ3 are the corresponding influence coefficients, α is the correction factor, in this embodiment, α is 0.35627, K is the proportional coefficient, and its specific value is set by professionals;

[0048] When the leakage factor Lo is less than the threshold value Ly, the detection data of the next unit time is collected and calculated again. When the leakage factor Lo is greater than or equal to the threshold value Ly, a leakage signal is generated. The threshold value Ly is determined by personnel in related fields.

[0049] Step 5: When detecting the leakage signal, the equipotential set is obtained, and the position of the voltage detection point corresponding to the element in the equipotential set is detected. The specific detection method is:

[0050] When a leakage signal is detected, the voltage of the voltage detection point corresponding to the element in the equipotential set is collected to obtain the detection voltage, and the detection voltage is compared. When all the detection voltages in any equipotential set are completely consistent, the position where the detection point in this equipotential set is located is a normal circuit. On the contrary, when there is a detection voltage value in the equipotential set that is not completely consistent, it means that there is a leakage current at the position corresponding to this equipotential set.

[0051] When leakage current is detected, the power-off protection device will be activated immediately, interrupting the on-board charging circuit and transmitting the leakage signal to relevant personnel, who will then report the leakage fault.

[0052] Embodiment 2:

[0053] The difference between this embodiment and embodiment one is that in this embodiment, a leakage sensor is further provided in the vehicle-mounted charging circuit. When the leakage sensor detects the presence of leakage current in the charging circuit, the specific position in the circuit is detected according to a method of the above embodiment to obtain the specific position of the leakage fault, and transmit the leakage signal to relevant personnel.

[0054] Embodiment three:

[0055] This embodiment is used to integrate and implement the first embodiment and the second embodiment, and its specific implementation method is as follows:

[0056] When the on-board charging circuit is in operation, the environmental detection device and the leakage sensor detect the leakage current at the same time. When any detection position sends a leakage signal, the voltage detection point in the equipotential set is detected to obtain the leakage fault location.

[0057] Some of the data in the above formula are calculated by removing the dimensions and taking their numerical values. The formula is a formula that is closest to the actual situation obtained by software simulation of a large amount of collected data; the preset parameters and preset thresholds in the formula are set by technical personnel in this field according to actual conditions or obtained through simulation of a large amount of data.

[0058] The working principle of the present invention is as follows: first, a charging circuit diagram of on-board charging is obtained, and it is modeled in simulation software to obtain a simulation circuit diagram, and at the same time, electrical components in the simulation circuit diagram are obtained, and voltage detection points are set on both sides of each electrical component respectively, and then, according to the simulation circuit diagram, any voltage detection point is selected as the midline point, the electrical components adjacent to the center point are obtained, and the voltage detection point in the middle is marked as an equipotential point, thereby obtaining an equipotential set, and then the circuit environment of the on-board charging is detected in real time, and the detection value is compared with the environmental standard interval to obtain a data acquisition signal, and the detection data on the environmental detector is collected according to the data acquisition signal, and processed to obtain a leakage factor, and then the leakage factor is compared with a threshold to obtain a leakage signal, and when a leakage signal is detected, the voltage of the voltage detection point corresponding to the element in the equipotential set is collected and compared, thereby obtaining the position of the leakage current.

[0059] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A leakage detection method based on vehicle charging, characterized in that: The method specifically comprises the following steps: Step 1: First, according to the charging circuit diagram of the vehicle charging, a simulation circuit diagram is obtained, and the electrical components Ei in the simulation circuit diagram are obtained, i=1, 2, 3, ..., and voltage detection points Eia and Eib are set on both sides of each electrical component Ei respectively; Step 2: Then, according to the position of the voltage detection point, a voltage detection point is taken as the center point, and the adjacent components are obtained, and all the voltage detection points between the center point and the adjacent components are marked as equipotential points to obtain an equipotential set; Step 3: Perform real-time detection on the circuit environment of the on-board charger, and compare the detection value with the environmental standard range to obtain a data acquisition signal, and collect the detection data on the environmental detector according to the data acquisition signal, and process it to obtain a leakage factor, and then compare the leakage factor with the threshold to obtain a leakage signal; Step 4: When a leakage signal is detected, an equipotential set is obtained, and the voltages of the voltage detection points in the equipotential set are detected respectively. When the detection voltage of an equipotential set is abnormal, it indicates that there is a leakage current. At the same time, the location of the leakage current is obtained according to the location of this equipotential set.

2. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: Electrical components refer to components such as resistors, capacitors, diodes, amplifiers and power supplies in circuits.

3. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: The relationship between the voltage detection points Eia and Eib set on both sides of the electrical component Ei is that Eia is the high potential point of the electrical component i, Eib is the low potential point in the electrical component i, and the voltage of the high potential point minus the low potential point is the potential difference between the two ends of the electrical component.

4. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: The specific method of obtaining the equipotential set is: S1: First obtain the positions of all electrical components in the simulation circuit diagram and the positions of the corresponding voltage detection points; S2: select any electrical element Ei, first select its high potential point Eia as the center point, then obtain the electrical elements adjacent to the center point, and mark them as adjacent elements Ln, n = 1, 2, 3, ..., and n < i; S3: Obtain the voltage detection points between the center point and all adjacent elements Ln, and mark them as equipotential points. At the same time, take the center point and all the equipotential points corresponding to it as elements of the equipotential set to obtain the equipotential set. S4: Select other unmarked voltage detection points respectively, mark them as center points, and process them according to the above steps S2 to S3 to obtain several equipotential sets.

5. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: The method for obtaining the leakage factor is: ST1: An environment detection device is first set up in the environment where the on-board charging circuit is placed, wherein the environment detection device includes a temperature detector, a humidity detector and a dust detector; ST2: Then, the corresponding environmental standard intervals are set in the environmental detector, and the environmental standard intervals include the temperature standard interval, the humidity standard interval and the dust standard interval; ST3: The environmental detector monitors the environment of the vehicle charging location in real time. When all environmental detection values ​​are within the corresponding environmental standard range, the environmental detector will not collect and transmit the detection data. Otherwise, it will generate a data collection signal. ST4: When the processor detects the data acquisition signal, the time when the data acquisition signal is detected is taken as the starting time, and the detection data on the environmental detector is collected every unit time t, and marked as temperature Tj, humidity Sj and dust value FCj, j = 1, 2, 3, ..., m, indicating that there are m groups of detection data, and j = 1 indicates the environmental detection data collected at the starting time; ST5: Use the formula Lo = (Tj×λ1+Sj×λ2+FCj×λ3) α ×K to obtain the leakage factor Lo, where λ1, λ2 and λ3 are the corresponding influence coefficients, α is the correction factor, and K is the proportional coefficient.

6. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: The method for obtaining the leakage signal is: When the leakage factor Lo is less than the threshold value Ly, the detection data of the next unit time is collected and calculated again. When the leakage factor Lo is greater than or equal to the threshold value Ly, a leakage signal is generated.

7. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: The method for obtaining the leakage current and the location of the leakage current is: When a leakage signal is detected, the voltage of the voltage detection point corresponding to the element in the equipotential set is collected to obtain the detection voltage, and the detection voltage is compared. When all the detection voltages in any equipotential set are completely consistent, the position where the detection point in this equipotential set is located is a normal circuit. On the contrary, when there is a detection voltage value in the equipotential set that is not completely consistent, it means that there is a leakage current at the position corresponding to this equipotential set. When leakage current is detected, the power-off protection device will be activated immediately, interrupting the on-board charging circuit and transmitting the leakage signal to relevant personnel.

8. The leakage detection method based on vehicle charging according to claim 1 is characterized in that: A leakage sensor is also provided in the vehicle charging circuit. When the leakage sensor detects leakage current in the charging circuit, the specific position in the circuit will be detected according to the method in step 4 above to obtain the specific position of the leakage fault, and transmit the leakage signal to relevant personnel.

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