DC Cross-Coupling Detection Method and Control Equipment

Abstract

The present invention provides a method and device for detecting DC cross-coupling. The method includes: obtaining the positive-to-ground voltage of the first auxiliary circuit, the negative-to-ground voltage of the first auxiliary circuit, the positive-to-ground voltage of the second auxiliary circuit, and the negative-to-ground voltage of the second auxiliary circuit; judging the type of DC cross-coupling according to the positive / negative sign of the difference between the positive-to-ground voltage of the first and the positive-to-ground voltage of the second, and the positive / negative sign of the difference between the negative-to-ground voltage of the first and the negative-to-ground voltage of the second; wherein the type of DC cross-coupling includes same-end cross-coupling and different-end cross-coupling. By collecting the voltages of two auxiliary circuits, then calculating the differences between the voltages, and according to the positive / negative signs of the differences, the cross-coupling type can be accurately found, improving the efficiency of fault detection.

Description

Technical Field

[0001] This application belongs to the field of fault detection, and particularly relates to a DC mutual penetration detection method and a control device. Background Art

[0002] DC mutual penetration is one of the main faults in the DC power source system. When DC mutual penetration occurs in the DC power source system, problems such as a decrease in the insulation performance of the DC power source system and abnormal voltage fluctuations will occur, affecting the safe operation of the DC power source system.

[0003] In the prior art, the occurrence of mutual penetration is usually determined by calculating the mutual penetration impedance. However, under the same working conditions, the same results will appear for positive-to-positive penetration and negative-to-negative penetration. Therefore, it is difficult to determine the type of mutual penetration. Summary of the Invention

[0004] In view of this, the present invention provides a DC mutual penetration detection method and a control device, aiming to solve the problem of low accuracy in the DC mutual penetration detection process.

[0005] The first aspect of the embodiment of the present invention provides a DC mutual penetration detection method, which is used to detect the mutual penetration type between two DC power source systems through a first auxiliary circuit and a second auxiliary circuit; among the two DC power source systems, the one with a larger bus voltage is the host, and the other is the slave; the first auxiliary circuit is connected to the host; the second auxiliary circuit is connected to the slave;

[0006] The first auxiliary circuit includes a first resistor and a second resistor connected in series; the second auxiliary circuit includes a third resistor and a fourth resistor connected in series; the connection point of the first resistor and the second resistor of the first auxiliary circuit and the connection point of the third resistor and the fourth resistor of the second auxiliary circuit are grounded together;

[0007] The DC mutual penetration detection method includes:

[0008] Obtain the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, the second positive-to-ground voltage, and the second negative-to-ground voltage of the second auxiliary circuit; judge the DC mutual penetration type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; where the DC mutual penetration type includes same-end mutual penetration and different-end mutual penetration.

[0009] In a possible implementation manner, the judging the DC mutual penetration type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage includes:

[0010] If sign(a) ≠ sign(d), then the DC mutual penetration type is the same - end mutual penetration;

[0011] If sign(a) = sign(d), then the DC mutual penetration type is the different - end mutual penetration;

[0012] Among them, sign(x) is the sign function, a is the positive - positive difference value, and d is the negative - negative difference value;

[0013] Among them, the positive - positive difference value is the difference between the first positive - to - ground voltage and the second positive - to - ground voltage;

[0014] The negative - negative difference value is the difference between the first negative - to - ground voltage and the second negative - to - ground voltage.

[0015] In a possible implementation manner, after determining that the DC mutual penetration type is the same - end mutual penetration, it further includes:

[0016] If |a| < |d|, then determine that the mutual penetration port order is positive - positive mutual penetration;

[0017] If |a| > |d|, then determine that the mutual penetration port order is negative - negative mutual penetration.

[0018] In a possible implementation manner, after determining that the DC mutual penetration type is the different - end mutual penetration, it further includes:

[0019] If sign(a) = sign(b) = sign(d), then determine that the mutual penetration port order is positive - negative mutual penetration;

[0020] If sign(a) = sign(c) = sign(d), then determine that the mutual penetration port order is negative - positive mutual penetration;

[0021] Among them, a is the positive - positive difference value, b is the positive - negative difference value, c is the negative - positive difference value, and d is the negative - negative difference value;

[0022] The positive - negative difference value is the difference between the first positive - to - ground voltage and the second negative - to - ground voltage;

[0023] The negative - positive difference value is the difference between the first negative - to - ground voltage and the second positive - to - ground voltage.

[0024] In a possible implementation manner, after determining the DC mutual penetration type, the method further includes:

[0025] Sample the leakage current of each branch in the host and the slave to obtain the sampled current of each branch;

[0026] Determine the branch with the absolute value of the sampled current greater than the preset current threshold as the mutual penetration branch.

[0027] The second aspect of the embodiments of the present invention provides a DC inter - penetration detection method, which is used to detect the type of inter - penetration between two DC power source systems through a first auxiliary circuit and a second auxiliary circuit; the first auxiliary circuit is connected to the host; the second auxiliary circuit is connected to the slave;

[0028] The first auxiliary circuit includes a first resistor and a second resistor connected in series, and the second auxiliary circuit includes a third resistor, a fourth resistor, a first switch, a second switch, and a third switch connected in series;

[0029] The connection point of the first resistor and the second resistor is the host grounding node; the connection point of the third resistor and the fourth resistor is the slave grounding node; the series - connected first switch and second switch are connected in parallel across the slave; the connection point of the first switch and the second switch is the host grounding node, and the third switch is connected between the host grounding node and the slave grounding node;

[0030] The DC inter - penetration detection method includes:

[0031] Closing the third switch and opening the first switch and the second switch;

[0032] Obtaining the first positive - to - ground voltage, the first negative - to - ground voltage of the first auxiliary circuit, the second positive - to - ground voltage, and the second negative - to - ground voltage of the second auxiliary circuit; judging the type of DC inter - penetration according to the positive - negative sign of the difference between the first positive - to - ground voltage and the second positive - to - ground voltage and the positive - negative sign of the difference between the first negative - to - ground voltage and the second negative - to - ground voltage; wherein the type of DC inter - penetration includes same - end inter - penetration and different - end inter - penetration;

[0033] If the type of DC inter - penetration is same - end inter - penetration, determining the order of the inter - penetration ports according to the absolute value of the difference between the first positive - to - ground voltage and the second positive - to - ground voltage and the absolute value of the difference between the first negative - to - ground voltage and the second negative - to - ground voltage;

[0034] If the type of DC inter - penetration is different - end inter - penetration, opening the third switch; obtaining the host bus voltage and the host bus negative - to - ground voltage of the first auxiliary circuit; determining the order of the inter - penetration ports according to the host bus voltage and the host bus negative - to - ground voltage; the host bus negative - to - ground voltage is the voltage corresponding to the alternate start - stop of the first switch and the second switch.

[0035] In a possible implementation, the host bus negative - to - ground voltage includes a first voltage and a second voltage; the first voltage is the host bus negative - to - ground voltage measured when the first switch is closed and the second switch is opened, and the second voltage is the host bus negative - to - ground voltage measured when the first switch is opened and the second switch is closed;

[0036] Determining the mutual penetration port sequence according to the host bus voltage and the host bus negative-to-ground voltage includes:

[0037] If both the first voltage and the second voltage are greater than half of the host bus voltage, the mutual penetration port sequence is from the negative pole of the slave bus to the positive pole of the host bus;

[0038] If both the first voltage and the second voltage are less than half of the host bus voltage, the mutual penetration port sequence is from the positive pole of the slave bus to the negative pole of the host bus.

[0039] A third aspect of the embodiments of the present invention provides a DC mutual penetration detection auxiliary device, including: a first auxiliary circuit and at least one second auxiliary circuit;

[0040] The first auxiliary circuit and each second auxiliary circuit are used to implement mutual penetration detection through the DC mutual penetration detection method described in the first aspect above;

[0041] Alternatively, the first auxiliary circuit and each second auxiliary circuit are used to implement mutual penetration detection through the DC mutual penetration detection method described in the second aspect above.

[0042] A fourth aspect of the embodiments of the present invention provides a DC mutual penetration detection device, including:

[0043] A first acquisition module, configured to acquire the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, and the second positive-to-ground voltage, the second negative-to-ground voltage of the second auxiliary circuit;

[0044] A first judgment module, configured to judge the DC mutual penetration type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; wherein the DC mutual penetration type includes same-end mutual penetration and different-end mutual penetration.

[0045] A fifth aspect of the embodiments of the present invention provides a DC mutual penetration detection device, including:

[0046] A switching module, configured to close the third switch and open the first switch and the second switch;

[0047] A second acquisition module, configured to acquire the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, and the second positive-to-ground voltage, the second negative-to-ground voltage of the second auxiliary circuit;

[0048] A second judgment module, configured to judge the DC mutual penetration type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; wherein the DC mutual penetration type includes same-end mutual penetration and different-end mutual penetration;

[0049] A first determination module, configured to determine the mutual penetration port order according to the absolute value of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the absolute value of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage when the DC mutual penetration type is same-end mutual penetration;

[0050] A second determination module, configured to disconnect the third switch when the DC mutual penetration type is different-end mutual penetration; obtain the main bus voltage and the main bus negative-to-ground voltage of the first auxiliary circuit; determine the mutual penetration port order according to the main bus voltage and the main bus negative-to-ground voltage; the main bus negative-to-ground voltage is the voltage corresponding to the alternating start and stop of the first switch and the second switch.

[0051] A fourth aspect of the embodiments of the present invention provides a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the DC mutual penetration detection method described in the first aspect above or the steps of the DC mutual penetration detection method described in the second aspect above are implemented.

[0052] A fifth aspect of the embodiments of the present invention provides a computer-readable storage medium storing a computer program, characterized in that when the computer program is executed by a processor, the steps of the DC mutual penetration detection method described in the first aspect above or the steps of the DC mutual penetration detection method described in the second aspect above are implemented.

[0053] The DC mutual penetration detection method and control device provided by the embodiments of the present invention include: obtaining the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, the second positive-to-ground voltage, and the second negative-to-ground voltage of the second auxiliary circuit; judging the DC mutual penetration type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; wherein the DC mutual penetration type includes same-end mutual penetration and different-end mutual penetration. By collecting the voltages of two auxiliary circuits, then calculating the differences between the voltages, and according to the positive and negative signs of the differences, the mutual penetration type can be accurately found, improving the efficiency of fault detection. Description of the Drawings

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0055] Figure 1It is a schematic diagram for detecting positive-to-positive cross-cabling between two DC power source systems in the prior art;

[0056] Figure 2 It is a schematic diagram for detecting negative-to-negative cross-cabling between two DC power source systems in the prior art;

[0057] Figure 3 It is a schematic diagram for detecting positive-to-negative cross-cabling between two DC power source systems in the prior art;

[0058] Figure 4 It is a schematic diagram for detecting negative-to-positive cross-cabling between two DC power source systems in the prior art;

[0059] Figure 5 It is a schematic diagram of the first auxiliary circuit and the second auxiliary circuit provided by an embodiment of the present invention;

[0060] Figure 6 It is a flowchart for implementing the DC cross-cabling detection method provided by an embodiment of the present invention;

[0061] Figure 7 It is a schematic diagram of the first auxiliary circuit and the second auxiliary circuit provided by another embodiment of the present invention;

[0062] Figure 8 It is a flowchart for implementing the DC cross-cabling detection method provided by another embodiment of the present invention;

[0063] Figure 9 It is a schematic diagram of the structure of the DC cross-cabling detection auxiliary device provided by an embodiment of the present invention;

[0064] Figure 10 It is a schematic diagram of the structure of the DC cross-cabling detection device provided by an embodiment of the present invention;

[0065] Figure 11 It is a schematic diagram of the structure of the DC cross-cabling detection device provided by another embodiment of the present invention;

[0066] Figure 12 It is a schematic diagram of the structure of the control device provided by an embodiment of the present invention. Detailed Embodiment

[0067] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0068] Figure 1 It is a schematic diagram for detecting positive-to-positive cross-cabling between two DC power source systems in the prior art.Figure 2 It is a schematic diagram for detecting negative-negative mutual penetration between two DC power source systems in the prior art. Figure 3 It is a schematic diagram for detecting positive-negative mutual penetration between two DC power source systems in the prior art. Figure 4 It is a schematic diagram for detecting negative-positive mutual penetration between two DC power source systems in the prior art.

[0069] In the prior art, generally Figures 1-4 The auxiliary circuit shown in is connected between two DC power source systems DC1 and DC2 to achieve DC mutual penetration detection. When detecting, the method of calculating the equivalent mutual penetration impedance is used to determine the occurrence of DC mutual penetration. However, the positive-positive mutual penetration and negative-negative mutual penetration will show the same results in this method, making it difficult to accurately judge the DC mutual penetration. And the circuit is relatively complex, and switch switching is required during the judgment process.

[0070] The calculation method of the above-mentioned equivalent mutual penetration impedance is specifically as follows (where U+ below is the voltage of the positive terminal of the host with respect to ground, and U- is the voltage of the negative terminal of the host with respect to ground):

[0071] As Figure 1 shown, when K4 is closed and K5 is open, positive-positive mutual penetration occurs between the two DC power source systems, and the mutual penetration equivalent impedance is

[0072] As Figure 2 shown, when K5 is closed and K4 is open, negative-negative mutual penetration occurs between the two DC power source systems, and the mutual penetration equivalent impedance is

[0073] As Figure 3 shown, when K5 is closed and K4 is open, positive-negative mutual penetration occurs between the two DC power source systems, and the mutual penetration equivalent impedance is

[0074] As Figure 4 shown, when K4 is closed and K5 is open, negative-positive mutual penetration occurs between the two DC power source systems, and the mutual penetration equivalent impedance is

[0075] The present invention provides a first auxiliary circuit, a second auxiliary circuit, and a corresponding DC mutual penetration detection method to determine the type of mutual penetration. The method of calculating the equivalent mutual penetration impedance given in the prior art can be used in the present invention to detect whether mutual penetration has occurred, that is, as the front-end detection of the present invention.

[0076] Figure 5 It is a schematic diagram of the first auxiliary circuit and the second auxiliary circuit provided by an embodiment of the present invention. As Figure 5 shown, in this embodiment, the DC mutual penetration detection method is used to detect two DC power source systems through the first auxiliary circuit 11 and the second auxiliary circuit 12 (for example Figure 1The crosstalk type between the shown DC1 and DC2). The bus voltage of DC1 in the two DC source systems is larger, which is taken as the master, and DC2 is taken as the slave. The first auxiliary circuit is connected to the master. The second auxiliary circuit is connected to the slave.

[0077] The first auxiliary circuit includes a first resistor R2 and a second resistor R4 connected in series. The second auxiliary circuit includes a third resistor R5 and a fourth resistor R6 connected in series. The first auxiliary circuit and the connection point of the third resistor R5 and the fourth resistor R6 of the second auxiliary circuit are grounded together through the connection point of the first resistor R2 and the second resistor R4.

[0078] The first auxiliary circuit and the second auxiliary circuit provided in this embodiment only require a total of four detection resistors, and no switch switching is required during the detection process, which has the advantages of simple operation, low cost and small volume compared with the prior art.

[0079] Figure 6 It is the implementation flowchart of the DC crosstalk detection method provided by the embodiment of the present invention. As Figure 6 shown, in this embodiment, the DC crosstalk detection method is used to detect the crosstalk type between two DC source systems through the first auxiliary circuit and the second auxiliary circuit shown in Figure 1 , and the method includes:

[0080] S601, obtain the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, and the second positive-to-ground voltage and the second negative-to-ground voltage of the second auxiliary circuit.

[0081] In this embodiment, the first positive-to-ground voltage is the voltage U across R2 shown in Figure 1 , the first negative-to-ground voltage is the voltage U across R4 shown in 1+ , the second positive-to-ground voltage is the voltage U across R5 shown in Figure 1 , and the second negative-to-ground voltage is the voltage U across R6 shown in 1- , the second positive-to-ground voltage is the voltage U across R5 shown in Figure 1 , and the second negative-to-ground voltage is the voltage U across R6 shown in 2+ , the second negative-to-ground voltage is the voltage U across R6 shown in Figure 1 , and the second negative-to-ground voltage is the voltage U across R6 shown in 2- .

[0082] S602, judge the DC crosstalk type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; wherein the DC crosstalk type includes same-end crosstalk and different-end crosstalk.

[0083] In this embodiment, through the positive and negative signs of U 1+ -U 2+ and the positive and negative signs of U 1- -U 2-The positive and negative signs can be used to determine the type of DC cross - shorting. The same - end cross - shorting occurs between the positive terminals of two DC source systems, and the different - end cross - shorting occurs between the positive terminal (or negative terminal) of one DC source system and the negative terminal (or positive terminal) of the other DC source system.

[0084] In this embodiment, by determining the DC cross - shorting type according to the positive and negative signs of the difference between the first positive - to - ground voltage and the second positive - to - ground voltage and the positive and negative signs of the difference between the first negative - to - ground voltage and the second negative - to - ground voltage, compared with the method of calculating the equivalent cross - shorting resistance in the prior art, less data is collected, the calculation is simple, and the DC cross - shorting type can be quickly and accurately determined.

[0085] In some embodiments, S602 may specifically include:

[0086] If sign(a)≠sign(d), then the DC cross - shorting type is the same - end cross - shorting;

[0087] If sign(a) = sign(d), then the DC cross - shorting type is the different - end cross - shorting;

[0088] Where sign(x) is the sign function, a is the positive - positive difference, and d is the negative - negative difference;

[0089] Where the positive - positive difference is the difference between the first positive - to - ground voltage and the second positive - to - ground voltage;

[0090] The negative - negative difference is the difference between the first negative - to - ground voltage and the second negative - to - ground voltage.

[0091] In some embodiments, after determining that the DC cross - shorting type is the same - end cross - shorting, it further includes:

[0092] If |a| < |d|, then determine that the cross - shorting port order is positive - positive cross - shorting;

[0093] If |a| > |d|, then determine that the cross - shorting port order is negative - negative cross - shorting.

[0094] In some embodiments, after determining that the DC cross - shorting type is the different - end cross - shorting, it further includes:

[0095] If sign(a) = sign(b) = sign(d), then determine that the cross - shorting port order is positive - negative cross - shorting;

[0096] If sign(a) = sign(c) = sign(d), then determine that the cross - shorting port order is negative - positive cross - shorting;

[0097] Where a is the positive - positive difference, b is the positive - negative difference, c is the negative - positive difference, and d is the negative - negative difference;

[0098] The positive - negative difference is the difference between the first positive - to - ground voltage and the second negative - to - ground voltage;

[0099] The negative-positive difference is the difference between the first negative-to-ground voltage and the second positive-to-ground voltage.

[0100] The determination of the above-mentioned DC cross-coupling type and cross-coupling port order is illustrated below through an implementation example, but it is not intended as a limitation. In this implementation example, the host bus voltage is 126.5V, the slave bus voltage is 126V, and the cross-coupling resistance is 50 kΩ.

[0101] Voltage data for positive-positive cross-coupling, positive-negative cross-coupling, negative-positive cross-coupling, and negative-negative cross-coupling are obtained through experimental simulation, as shown in Table 1-4 specifically:

[0102] Table 1 Positive-Positive Cross-Coupling Voltage Data Table

[0103]

[0104]

[0105] It can be concluded from Table 1 that the condition for positive-positive cross-coupling is and |a| < |d|

[0106] Table 2 Positive-Negative Cross-Coupling Voltage Data Table

[0107]

[0108] It can be concluded from Table 2 that the condition for positive-negative cross-coupling is sign(a) = sign(b) = sign(d).

[0109] Table 3 Negative-Positive Cross-Coupling Voltage Data Table

[0110]

[0111] It can be concluded from Table 3 that the condition for negative-positive cross-coupling is sign(a) = sign(c) = sign(d).

[0112] Table 4 Negative-Negative Cross-Coupling Voltage Data Table

[0113]

[0114] It can be concluded from Table 4 that the condition for negative-negative cross-coupling is and |a| > |d|.

[0115] From the above implementation example, it can be concluded that

[0116] If is satisfied, then it is cross-coupling at the same end;

[0117] If is not satisfied, then it is cross-coupling at different ends;

[0118] Among them, a is a positive - positive difference value, b is a positive - negative difference value, c is a negative - positive difference value, and d is a negative - negative difference value.

[0119] In this embodiment, sign(x) is a sign function. When x > 0, sign(x)=1; when x = 0, sign(x)=0; when x < 0, sign(x)= - 1.

[0120] It can also be seen from Table 1 - 4 above that b > 0 and c < 0 always exist. Therefore, the above - mentioned judgment formula can be simplified as: if sign(a)≠sign(d), then the DC inter - penetration type is the same - end inter - penetration;

[0121] If sign(a)=sign(d), then the DC inter - penetration type is the different - end inter - penetration.

[0122] It should be noted that the premise for the above - mentioned judgment condition to hold is that the main - machine bus voltage is greater than the slave - machine bus. When the slave - machine bus voltage is greater than the main - machine bus voltage, in the calculation of a, b, c, and d, the voltages in their calculation formulas need to be swapped. For example, a = U 1+ -U 2+ , when the slave - machine bus voltage is greater than the main - machine bus voltage, a = U 2+ -U 1+ .

[0123] In some embodiments, after S602, the method may further include:

[0124] Sampling the leakage current of each branch in the first DC power source system and the second DC power source system to obtain the sampled current of each branch;

[0125] Determining the inter - penetrated branch as the branch whose absolute value of the sampled current is greater than the preset current threshold.

[0126] For the first DC power source system and the second DC power source system, there are often multiple branches. By detecting the preset voltage detection points, only the inter - penetration type can be judged, but the specific inter - penetrated branch cannot be determined.

[0127] In this embodiment, by sampling the leakage current of each branch, the branch where the inter - penetration occurs can be determined, which is convenient for maintenance personnel to perform maintenance.

[0128] It should be understood that the magnitudes of the sequence numbers of the steps in the above - mentioned embodiments do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0129] Figure 7 is a schematic diagram of the first auxiliary circuit and the second auxiliary circuit provided by another embodiment of the present invention. As Figure 7As shown, in this embodiment, the DC cross-coupling detection method is used to detect the cross-coupling type between two DC power source systems (DC1 and DC2 shown in the figure) through a first auxiliary circuit and a second auxiliary circuit; the first auxiliary circuit is connected to the host; the second auxiliary circuit is connected to the slave.

[0130] The first auxiliary circuit includes a first resistor R2 and a second resistor R4 connected in series, and the second auxiliary circuit includes a third resistor R5, a fourth resistor R6, a first switch K4, a second switch K5, and a third switch K6 connected in series.

[0131] The connection point of the first resistor R2 and the second resistor R4 is the host grounding node; the connection point of the third resistor R5 and the fourth resistor R6 is the slave grounding node; the series-connected first switch K4 and second switch K5 are connected in parallel across the slave; the connection point of the first switch K4 and the second switch K5 is the host grounding node, and the third switch K6 is connected between the host grounding node and the slave grounding node.

[0132] The first auxiliary circuit and the second auxiliary circuit provided in this embodiment only require 4 detection resistors and 3 switches to complete the detection of DC cross-coupling. Compared with the existing method of calculating the equivalent cross-coupling resistance, the circuit is simpler.

[0133] Figure 8 is the implementation flowchart of the DC cross-coupling detection method provided in another embodiment of the present invention. As Figure 8 shown, in this embodiment, the DC cross-coupling detection method includes:

[0134] Close the third switch and open the first switch and the second switch;

[0135] Obtain the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, the second positive-to-ground voltage, and the second negative-to-ground voltage of the second auxiliary circuit; judge the DC cross-coupling type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; where the DC cross-coupling type includes same-end cross-coupling and different-end cross-coupling;

[0136] If the DC cross-coupling type is same-end cross-coupling, determine the cross-coupling port order according to the absolute value of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the absolute value of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage;

[0137] If the DC cross-coupling type is different-end cross-coupling, open the third switch; obtain the host bus voltage and the host bus negative-to-ground voltage of the first auxiliary circuit; determine the cross-coupling port order according to the host bus voltage and the host bus negative-to-ground voltage; the host bus negative-to-ground voltage is the voltage corresponding to the alternating start and stop of the first switch and the second switch.

[0138] The first positive-to-ground voltage isFigure 7 The voltage U across R2 shown in 1+ , and the first negative voltage to ground is Figure 7 The voltage U across R4 shown in 1- , and the second positive voltage to ground is Figure 7 The voltage U across R5 shown in 2+ , and the second negative voltage to ground is Figure 7 The voltage U across R6 shown in 2- . After S801, the circuit will be the same as the circuit shown in Figure 1 , so the method of DC mutual penetration detection corresponding to Figure 1 is the same, and will not be limited here. At S804, that is, when the DC mutual penetration type is heretical mutual penetration, the circuit after switching is different from the circuit shown in Figure 1 . At this time, the negative voltage of the bus to ground during the switching process is used to judge the order of the mutual penetration ports. The specific judgment method is as follows:

[0139] In some embodiments, the negative voltage of the host bus to ground includes a first voltage and a second voltage; the first voltage is the negative voltage of the host bus to ground measured when the first switch is closed and the second switch is opened, and the second voltage is the negative voltage of the host bus to ground measured when the first switch is opened and the second switch is closed;

[0140] Determining the order of the mutual penetration ports according to the host bus voltage and the negative voltage of the host bus to ground includes:

[0141] If both the first voltage and the second voltage are greater than half of the host bus voltage, the order of the mutual penetration ports is from the negative pole of the slave bus to the positive pole of the host bus;

[0142] If both the first voltage and the second voltage are less than half of the host bus voltage, the order of the mutual penetration ports is from the positive pole of the slave bus to the negative pole of the host bus.

[0143] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0144] Figure 9 is a schematic structural diagram of a DC mutual penetration detection auxiliary device provided by an embodiment of the present invention. As shown in Figure 9 , in this embodiment, the DC mutual penetration detection auxiliary device 9 includes: a first auxiliary circuit 91 and at least one second auxiliary circuit 92;

[0145] The first auxiliary circuit 91 and each second auxiliary circuit 92 are used to implement mutual penetration detection through the DC mutual penetration detection method of any one of the embodiments shown in Figure 5 and Figure 6 ;

[0146] Alternatively, the first auxiliary circuit and each second auxiliary circuit are used to implement crosstalk detection through the DC crosstalk detection method of any one of the embodiments shown as follows Figure 7 and Figure 8 shown below.

[0147] Figure 10 FIG. [FIG. number] is a schematic structural diagram of the DC crosstalk detection device provided by an embodiment of the present invention. As Figure 10 shown, the DC crosstalk detection device 10 includes:

[0148] A first acquisition module 1010, configured to acquire the first positive-to-ground voltage, the first negative-to-ground voltage of the first auxiliary circuit, the second positive-to-ground voltage, and the second negative-to-ground voltage of the second auxiliary circuit;

[0149] A first judgment module 1020, configured to judge the DC crosstalk type according to the positive / negative sign of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive / negative sign of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; wherein the DC crosstalk type includes in-phase crosstalk and out-of-phase crosstalk.

[0150] Optionally, the first judgment module 1020 is specifically configured to:

[0151] If sign(a) ≠ sign(d), the DC crosstalk type is in-phase crosstalk;

[0152] If sign(a) = sign(d), the DC crosstalk type is out-of-phase crosstalk;

[0153] wherein, sign(x) is a sign function, a is the positive-positive difference, and d is the negative-negative difference;

[0154] wherein, the positive-positive difference is the difference between the first positive-to-ground voltage and the second positive-to-ground voltage;

[0155] The negative-negative difference is the difference between the first negative-to-ground voltage and the second negative-to-ground voltage.

[0156] Optionally, the DC crosstalk detection device 10 further includes a first port judgment module 1030.

[0157] The first port judgment module 1030 is configured to:

[0158] If |a| < |d|, determine that the crosstalk port order is positive-positive crosstalk;

[0159] If |a| > |d|, determine that the crosstalk port order is negative-negative crosstalk.

[0160] Optionally, the DC crosstalk detection device 10 further includes a second port judgment module 1040.

[0161] The second port judgment module 1040 is configured to:

[0162] If sign(a) = sign(b) = sign(d), then it is determined that the cross-coupling port order is positive-negative cross-coupling;

[0163] If sign(a) = sign(c) = sign(d), then it is determined that the cross-coupling port order is negative-positive cross-coupling;

[0164] Wherein, a is the positive-positive difference, b is the positive-negative difference, c is the negative-positive difference, and d is the negative-negative difference;

[0165] The positive-negative difference is the difference between the first positive voltage to ground and the second negative voltage to ground;

[0166] The negative-positive difference is the difference between the first negative voltage to ground and the second positive voltage to ground.

[0167] Optionally, the DC cross-coupling detection device 10 further includes a branch determination module 1050.

[0168] The branch determination module 1050 is used for:

[0169] Sampling the leakage current of each branch in the host and the slave to obtain the sampling current of each branch;

[0170] Determine the cross-coupling branch as the branch where the absolute value of the sampling current is greater than the preset current threshold.

[0171] The DC cross-coupling detection device provided in this embodiment can be used to execute the above Figure 5 and Figure 6 The method embodiments shown, and their implementation principles and technical effects are similar, so they will not be elaborated here in this embodiment.

[0172] Figure 11 It is a schematic structural diagram of the DC cross-coupling detection device provided by the embodiment of the present invention. As Figure 11 shown, the DC cross-coupling detection device 11 includes:

[0173] The switching module 1110 is used to close the third switch and open the first switch and the second switch;

[0174] The second acquisition module 1120 is used to acquire the first positive voltage to ground, the first negative voltage to ground of the first auxiliary circuit, the second positive voltage to ground, and the second negative voltage to ground of the second auxiliary circuit;

[0175] The second determination module 1130 is used to judge the DC cross-coupling type according to the positive and negative signs of the difference between the first positive voltage to ground and the second positive voltage to ground and the positive and negative signs of the difference between the first negative voltage to ground and the second negative voltage to ground; wherein the DC cross-coupling type includes same-end cross-coupling and different-end cross-coupling;

[0176] The first determination module 1140 is configured to determine the mutual penetration port sequence according to the absolute value of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the absolute value of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage when the DC mutual penetration type is the same-end mutual penetration;

[0177] The second determination module 1150 is configured to disconnect the third switch when the DC mutual penetration type is the different-end mutual penetration; obtain the main bus voltage and the main bus negative-to-ground voltage of the first auxiliary circuit; determine the mutual penetration port sequence according to the main bus voltage and the main bus negative-to-ground voltage; the main bus negative-to-ground voltage is the voltage corresponding to the alternate start and stop of the first switch and the second switch.

[0178] Optionally, the second determination module 1150 is specifically configured to:

[0179] If both the first voltage and the second voltage are greater than half of the main bus voltage, the mutual penetration port sequence is from the negative pole of the slave bus to the positive pole of the main bus;

[0180] If both the first voltage and the second voltage are less than half of the main bus voltage, the mutual penetration port sequence is from the positive pole of the slave bus to the negative pole of the main bus.

[0181] The DC mutual penetration detection device provided in this embodiment can be used to execute the above Figure 7 and Figure 8 shown method embodiments, and their implementation principles and technical effects are similar, and will not be elaborated here in this embodiment.

[0182] Figure 12 is a schematic structural diagram of a control device provided by an embodiment of the present invention. As Figure 12 shown, the control device 12 of this embodiment includes: a processor 1200, a memory 1210, and a computer program 1220 stored in the memory 1210 and executable on the processor 1200. When the processor 1200 executes the computer program 1220, the steps in the above-mentioned various DC mutual penetration detection method embodiments are implemented, such as Figure 6 shown steps 601 to 602 or as Figure 8 shown steps 801-804. Alternatively, when the processor 1200 executes the computer program 1220, the functions of each module / unit in the above-mentioned device embodiments are implemented, such as Figure 10 shown modules 1010 to 1020.

[0183] Exemplarily, the computer program 1220 can be divided into one or more modules / units. One or more modules / units are stored in the memory 1210 and executed by the processor 1200 to complete the present invention. One or more modules / units can be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program 1220 in the control device 12.

[0184] The control device 12 can be a control terminal, a single-chip microcomputer, an MCU, etc., which is not limited herein. Those skilled in the art can understand that Figure 12 These are merely examples of the control device 12 and do not constitute a limitation on the control device 12. It may include more or fewer components than shown in the figure, or combine certain components, or different components.

[0185] The so-called processor 1200 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0186] The memory 1210 may be an internal storage unit of the control device 12, such as the hard disk or memory of the control device 12. The memory 1210 may also be an external storage device of the control device 12, such as a plug-in hard disk equipped on the control device 12, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 1210 may also include both the internal storage unit and the external storage device of the control device 12. The memory 1210 is used to store computer programs and other programs and data required by the terminal. The memory 1210 may also be used to temporarily store data that has been output or will be output.

[0187] An embodiment of the present invention provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the embodiment of the above DC mutual penetration detection method are implemented.

[0188] The computer-readable storage medium stores a computer program 1220, which includes program instructions. When the program instructions are executed by the processor 1200, all or part of the processes in the methods of the above embodiments are implemented. It can also be completed by instructing related hardware through the computer program 1220. The computer program 1220 can be stored in a computer-readable storage medium. When the computer program 1220 is executed by the processor 1200, the steps of the above various method embodiments can be implemented. Among them, the computer program 1220 includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0189] The computer-readable storage medium can be the internal storage unit of the terminal in any of the foregoing embodiments, such as the hard disk or memory of the terminal. The computer-readable storage medium can also be an external storage device of the terminal, such as a plug-in hard disk equipped on the terminal, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the computer-readable storage medium can also include both the internal storage unit and the external storage device of the terminal. The computer-readable storage medium is used to store the computer program and other programs and data required by the terminal. The computer-readable storage medium can also be used to temporarily store the data that has been output or will be output.

[0190] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0191] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0192] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be assigned to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0193] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0194] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in the form of hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0195] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0196] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0197] In addition, in each embodiment of the present invention, each functional unit may be integrated into a processing unit, may exist physically alone for each unit, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0198] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it may also be completed by instructing relevant hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments may be implemented. Among them, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device that can carry computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0199] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A DC mutual penetration detection method, characterized in that The DC mutual penetration detection method is used to detect the type of mutual penetration between two DC power source systems through a first auxiliary circuit and a second auxiliary circuit; the DC power source system with a larger bus voltage among the two DC power source systems is the host, and the other is the slave; the first auxiliary circuit is connected to the host; the second auxiliary circuit is connected to the slave; The first auxiliary circuit includes a first resistor and a second resistor connected in series; the second auxiliary circuit includes a third resistor and a fourth resistor connected in series; the first auxiliary circuit and the second auxiliary circuit are grounded together at the connection point of the first resistor and the second resistor and the connection point of the third resistor and the fourth resistor; The DC mutual penetration detection method includes: Obtaining a first positive-to-ground voltage, a first negative-to-ground voltage of the first auxiliary circuit, a second positive-to-ground voltage, and a second negative-to-ground voltage of the second auxiliary circuit; If , the DC mutual penetration type is the same-end mutual penetration; If , the DC intermixing type is heretical intermixing; where, sign( x ) is the sign function, a is the positive-positive difference, d is the negative-negative difference; Wherein, the positive-positive difference is the difference between the first positive-to-ground voltage and the second positive-to-ground voltage; The negative-negative difference is the difference between the first negative-to-ground voltage and the second negative-to-ground voltage.

2. The DC mutual penetration detection method according to claim 1, wherein, After determining that the DC mutual penetration type is in-phase mutual penetration, it further includes: If , it is determined that the cross-port order is positive-positive cross If , then it is determined that the cross-port order is negative-negative cross.

3. The DC mutual penetration detection method according to claim 1, characterized in that After determining that the DC mutual penetration type is out-of-phase mutual penetration, it further includes: If , it is determined that the order of the interpenetrating ports is positive-negative interpenetration; If , it is determined that the order of the interpenetrating ports is negative-positive interpenetration; Wherein, a is the positive-positive difference, b is the positive-negative difference, c is the negative-positive difference, d is the negative-negative difference; The positive-negative difference is the difference between the first positive-to-ground voltage and the second negative-to-ground voltage; The negative-positive difference is the difference between the first negative-to-ground voltage and the second positive-to-ground voltage.

4. The DC cross-coupling detection method according to any one of claims 1-3, characterized in that, After determining the DC mutual penetration type, the method further includes: Sampling the leakage current of each branch in the host and the slave to obtain the sampling current of each branch; Determining the branch with the absolute value of the sampling current greater than the preset current threshold as the mutual penetration branch.

5. A DC inter-crosstalk detection method, characterized in that The DC mutual penetration detection method is used to detect the type of mutual penetration between two DC power source systems through a first auxiliary circuit and a second auxiliary circuit; The first auxiliary circuit is connected to the host; the second auxiliary circuit is connected to the slave; The first auxiliary circuit includes a first resistor and a second resistor connected in series, and the second auxiliary circuit includes a third resistor, a fourth resistor, a first switch, a second switch, and a third switch connected in series; The connection point of the first resistor and the second resistor is the host grounding node; the connection point of the third resistor and the fourth resistor is the slave grounding node; the series-connected first switch and second switch are connected in parallel across the slave; the connection point of the first switch and the second switch is the host grounding node, and the third switch is connected between the host grounding node and the slave grounding node; The DC mutual penetration detection method includes: Closing the third switch and opening the first switch and the second switch; Obtaining a first positive-to-ground voltage, a first negative-to-ground voltage of the first auxiliary circuit, a second positive-to-ground voltage, and a second negative-to-ground voltage of the second auxiliary circuit; judging the DC mutual penetration type according to the positive and negative signs of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the positive and negative signs of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; wherein the DC mutual penetration type includes in-phase mutual penetration and out-of-phase mutual penetration; If the DC cross-coupling type is the same-end cross-coupling, determine the cross-coupling port sequence according to the absolute value of the difference between the first positive-to-ground voltage and the second positive-to-ground voltage and the absolute value of the difference between the first negative-to-ground voltage and the second negative-to-ground voltage; If the DC cross-coupling type is the different-end cross-coupling, disconnect the third switch; obtain the main bus voltage and the main bus negative-to-ground voltage of the first auxiliary circuit; determine the cross-coupling port sequence according to the main bus voltage and the main bus negative-to-ground voltage; the main bus negative-to-ground voltage is the voltage corresponding to the alternating start and stop of the first switch and the second switch.

6. The DC mutual penetration detection method according to claim 5, wherein The main bus negative-to-ground voltage includes a first voltage and a second voltage; the first voltage is the main bus negative-to-ground voltage measured when the first switch is closed and the second switch is opened, and the second voltage is the main bus negative-to-ground voltage measured when the first switch is opened and the second switch is closed; The determining the cross-coupling port sequence according to the main bus voltage and the main bus negative-to-ground voltage includes: If both the first voltage and the second voltage are greater than half of the main bus voltage, the cross-coupling port sequence is from the negative pole of the slave bus to the positive pole of the main bus; If both the first voltage and the second voltage are less than half of the main bus voltage, the cross-coupling port sequence is from the positive pole of the slave bus to the negative pole of the main bus.

7. A DC mutual penetration detection auxiliary device, characterized in that Includes: A first auxiliary circuit and at least one second auxiliary circuit; The first auxiliary circuit and each second auxiliary circuit are used to perform cross-coupling detection through the DC cross-coupling detection method according to any one of claims 1-4; Or, the first auxiliary circuit and each second auxiliary circuit are used to perform cross-coupling detection through the DC cross-coupling detection method according to one of claims 5 and 6.

8. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, the steps of the DC cross-coupling detection method according to any one of claims 1 to 4 above or the steps of the DC cross-coupling detection method according to one of claims 5 and 6 above are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, the steps of the DC cross-coupling detection method according to any one of claims 1 to 4 above or the steps of the DC cross-coupling detection method according to one of claims 5 and 6 above are implemented.

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