Insulation Resistance Detection Device, Vehicle, and Method for Determining Insulation Resistance Value

Abstract

The present application discloses a detection device for insulation resistance, a vehicle, and a method for determining the value of insulation resistance. The detection device for insulation resistance includes: N high-voltage platforms, N positive insulation resistors, N negative insulation resistors, a processing module, a first resistor, a second resistor, a voltage signal source, and a voltage measurement module. The first end of the first resistor is connected to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor is connected to the positive pole of the voltage signal source. The negative pole of the voltage signal source is connected to the ground terminal. The first end of the voltage measurement module is connected to the second connection point of the first resistor and the second resistor. The second end of the voltage measurement module is connected to the negative pole of the voltage signal source. The processing module is connected to the voltage measurement module, and the processing module is used to determine the parallel value of the insulation resistances of the N high-voltage platforms according to the voltage value output by the voltage measurement module.

Description

Technical Field

[0001] The present application relates to the field of insulation resistance detection, and particularly to a detection device for insulation resistance, a vehicle, and a method for determining the insulation resistance value. Background Art

[0002] In order to ensure the safety of vehicle driving, it is necessary to detect the resistance values of the positive and negative insulation resistances of the high-voltage platform of the vehicle. With the development of electric vehicles, current electric vehicles need to use multiple electrically connected high-voltage platforms to work simultaneously. In the related art, it is necessary to design a set of insulation detection circuits for each of the multiple high-voltage platforms to realize the detection of the insulation resistances of the multiple high-voltage platforms. Therefore, by detecting the insulation resistances of the multiple high-voltage platforms through the above solution, the structure of the entire device is relatively complex. Summary of the Invention

[0003] The present application discloses a detection device for insulation resistance, a vehicle, and a method for determining the insulation resistance value, which solves the problem that the structure of the device for detecting the insulation resistances of multiple high-voltage platforms is relatively complex.

[0004] To solve the above problems, the present application adopts the following technical solutions:

[0005] In a first aspect, an embodiment of the present application discloses a detection device for insulation resistance, including: N high-voltage platforms, N positive insulation resistors, N negative insulation resistors, a processing module, a first resistor, a second resistor, a voltage signal source, and a voltage measurement module, where N is an integer greater than or equal to 2, and: the Nth high-voltage platform among the N high-voltage platforms is connected to any one of the previous (N - 1) high-voltage platforms through a positive or negative electrode. The first high-voltage platform among the N high-voltage platforms includes a first high-voltage sub-platform and a second high-voltage sub-platform, and the negative electrode of the first high-voltage sub-platform is connected to the positive electrode of the second high-voltage sub-platform; one of the N positive insulation resistors is connected between the positive electrode of a high-voltage platform and the ground terminal; one of the N negative insulation resistors is connected between the negative electrode of a high-voltage platform and the ground terminal; the first end of the first resistor is connected to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform, and the second end of the first resistor is connected to the first end of the second resistor; the second end of the second resistor is connected to the positive electrode of the voltage signal source; the negative electrode of the voltage signal source is connected to the ground terminal; the first end of the voltage measurement module is connected to the second connection point of the first resistor and the second resistor, and the second end of the voltage measurement module is connected to the negative electrode of the voltage signal source; the processing module is connected to the voltage measurement module, and the processing module is configured to determine the parallel value of the insulation resistances of the N high-voltage platforms according to the voltage value output by the voltage measurement module.

[0006] In a second aspect, an embodiment of the present application discloses a vehicle, including the detection device for insulation resistance described in the first aspect above.

[0007] In a third aspect, an embodiment of the present application discloses a method for determining the insulation resistance value, which is applied to the detection device for insulation resistance described in the first aspect above. The determination method includes: obtaining a first voltage value, a second voltage value, a third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor, where the first voltage value is the voltage value output by the voltage signal source, the second voltage value is the voltage value measured by the voltage measurement module when the first voltage value is positive, and the third voltage value is the voltage value measured by the voltage measurement module when the first voltage value is negative; determining the parallel value of the insulation resistances of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor.

[0008] The technical solution adopted by the present application can achieve the following beneficial effects:

[0009] An embodiment of the present application provides a detection device for insulation resistance. The detection device for insulation resistance includes N high-voltage platforms, N positive insulation resistors, N negative insulation resistors, a processing module, a first resistor, a second resistor, a voltage signal source, and a voltage measurement module. The Nth high-voltage platform among the N high-voltage platforms is connected to any one of the previous (N - 1) high-voltage platforms through a positive or negative electrode. The first high-voltage platform among the N high-voltage platforms includes a first high-voltage sub-platform and a second high-voltage sub-platform. The negative electrode of the first high-voltage sub-platform is connected to the positive electrode of the second high-voltage sub-platform. One of the N positive insulation resistors is connected between the positive electrode of a high-voltage platform and the ground terminal. One of the N negative insulation resistors is connected between the negative electrode of a high-voltage platform and the ground terminal. The first resistor, the second resistor, the voltage signal source, and the voltage measurement module form a detection circuit. The first end of the first resistor is connected to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor is connected to the positive electrode of the voltage signal source. The negative electrode of the voltage signal source is connected to the ground terminal. The first end of the voltage measurement module is connected to the second connection point of the first resistor and the second resistor. The second end of the voltage measurement module is connected to the negative electrode of the voltage signal source. Then the processing module is connected to the voltage measurement module. The processing module is configured to determine the parallel value of the insulation resistances of the N high-voltage platforms according to the voltage value output by the voltage measurement module. That is, the present application can realize the detection of the parallel value of the insulation resistances of N high-voltage platforms through a detection circuit connected between the first high-voltage sub-platform and the second high-voltage sub-platform and a processing module connected to the voltage measurement module in the detection circuit. Moreover, the device structure for realizing the detection of the parallel value of the insulation resistances of N high-voltage platforms in the present application is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of a detection device for insulation resistance disclosed in an embodiment of the present application;

[0011] Figures 2 to 6 is a schematic diagram of a voltage detection module measuring the voltage at the first end of the second resistor in an embodiment of the present application;

[0012] Figure 7 is a schematic flowchart of a method for determining the insulation resistance value disclosed in an embodiment of the present application;

[0013] Figure 8 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0015] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data may be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object may be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0016] Figure 1 FIG. is a schematic structural diagram of a detection device for insulation resistance disclosed in an embodiment of the present application.

[0017] It should be noted that the following insulation resistances are all equivalent resistances.

[0018] As Figure 1 shown, the detection device for insulation resistance disclosed in the embodiment of the present application includes: N high-voltage platforms, N positive insulation resistances, N negative insulation resistances, a processing module, a first resistor R1, a second resistor R0, a voltage signal source DC, and a voltage measurement module U1, where N is an integer greater than or equal to 2.

[0019] The Nth high-voltage platform among the N high-voltage platforms is connected to any one of the previous (N - 1) high-voltage platforms through a positive or negative electrode. The first high-voltage platform among the N high-voltage platforms includes a first high-voltage sub-platform and a second high-voltage sub-platform, and the negative electrode of the first high-voltage sub-platform is connected to the positive electrode of the second high-voltage sub-platform.

[0020] Exemplarily, when N = 2, that is, the insulation resistance detection device includes two high-voltage platforms (B1 and B2), the negative electrode of B2 can be connected to the negative electrode of B1, or the positive electrode of B2 can be connected to the positive electrode of B1; when N = 3, that is, the insulation resistance detection device includes three high-voltage platforms (B1, B2, and B3), the negative electrode of B2 can be connected to the negative electrode of B1, the negative electrode of B3 can be connected to the negative electrode of B2, or the positive electrode of B2 can be connected to the positive electrode of B1, the positive electrode of B3 can be connected to the positive electrode of B2, or the negative electrode of B2 can be connected to the negative electrode of B1, the positive electrode of B3 can be connected to the positive electrode of B2, or the positive electrode of B2 can be connected to the positive electrode of B1, the negative electrode of B3 can be connected to the negative electrode of B2. It should be noted that the positive electrode of B3 can also be connected to the positive electrode of B1, or the negative electrode of B3 can also be connected to the negative electrode of B1, which will not be elaborated one by one in this application.

[0021] In this application, the first high-voltage platform can be any one of the N high-voltage platforms. The voltage threshold of the high-voltage platform is greater than the target threshold, and the target threshold can be the safe voltage value of the national standard. When the high-voltage platform is a high-voltage platform applied to an electric vehicle, the target threshold can be 60V. That is, when the high-voltage platform is a high-voltage platform applied to an electric vehicle, the voltage threshold of the high-voltage platform is greater than 60V.

[0022] One of the N positive insulation resistances is connected between the positive electrode of a high-voltage platform and the ground terminal, and one of the N negative insulation resistances is connected between the negative electrode of a high-voltage platform and the ground terminal. That is to say, each high-voltage platform can correspond to a positive insulation resistance and a negative insulation resistance. As Figure 1 shown, taking the high-voltage platform B1 corresponding to the positive insulation resistance r1p and the negative insulation resistance r1n, and the high-voltage platform B2 corresponding to the positive insulation resistance r2p and the negative insulation resistance r2n as an example, the positive insulation resistance r1p is connected between the positive electrode of the high-voltage platform B1 and the ground terminal (i.e., Figure 1 the vehicle frame ground shown in), the negative insulation resistance r1n is connected between the negative electrode of the high-voltage platform B1 and the ground terminal, the positive insulation resistance r2p is connected between the positive electrode of the high-voltage platform B2 and the ground terminal, and the negative insulation resistance r2n is connected between the negative electrode of the high-voltage platform B2 and the ground terminal.

[0023] In this application, as Figure 1As shown, a detection circuit is composed of a first resistor R1, a second resistor R0, a voltage signal source DC, and a voltage measurement module U1. Among them, the first end of the first resistor R1 is connected to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform, and the second end of the first resistor R1 is connected to the first end of the second resistor R0; the second end of the second resistor R0 is connected to the positive pole of the voltage signal source DC; the negative pole of the voltage signal source DC is connected to the ground terminal; the first end of the voltage measurement module U1 is connected to the second connection point of the first resistor R1 and the second resistor R0, and the second end of the voltage measurement module U1 is connected to the negative pole of the voltage signal source DC. The voltage measurement module U1 is used to measure the voltage value at the first end (i.e., the right end) of the second resistor R0. In the embodiment of the present application, the first resistor R1 is a resistor to prevent the system insulation resistance from decreasing. At the same time, the first resistor R1 has a voltage-dividing effect, and the resistance value of the first resistor R1 can be 500K to 5M ohms. It should be noted that the system insulation resistance is the smallest insulation resistance among the N positive-pole insulation resistors and the N negative-pole insulation resistors. The second resistor R0 is a standard resistor, and the resistance value of the second resistor R0 can be several K to dozens of K ohms. The high voltage of the first high-voltage platform is divided by the first resistor R1 and the second resistor R0 to a range that the voltage measurement module can handle (usually within 10V) to facilitate the voltage measurement module to process and convert. The voltage signal source DC outputs a signal voltage +E or -E, generally 5 to 12V. The higher the signal voltage output by the voltage signal source DC, the stronger the anti-interference performance.

[0024] In the present application, the processing module is connected to the voltage measurement module U1, and the processing module is used to determine the parallel value of the insulation resistances of the N high-voltage platforms according to the voltage value output by the voltage measurement module U1. That is to say, in the present application, the processing module receives the voltage value at the first end (i.e., the right end) of the second resistor R0 measured by the voltage measurement module U1, and the processing module determines the parallel value of the insulation resistances of the N high-voltage platforms according to the received voltage value at the first end (i.e., the right end) of the second resistor R0. In the case of determining the parallel value of the insulation resistances of the N high-voltage platforms, the parallel value of the insulation resistances of the N high-voltage platforms can be compared with the warning resistance value. In the case where the parallel value of the insulation resistances of the N high-voltage platforms is less than the warning resistance value, a safety warning is issued, where the warning resistance value can be determined according to the voltage value of the high-voltage platform with the highest voltage value among the N high-voltage platforms and the warning value of the national standard.

[0025] The following takes Figure 1Taking the insulation resistance detection device shown as an example, a method for determining the parallel value of the insulation resistances of two high-voltage platforms in an insulation resistance detection device including two high-voltage platforms (B1 and B2) will be described. The high-voltage platform B1 corresponds to the positive insulation resistance r1p and the negative insulation resistance r1n, and the high-voltage platform B2 corresponds to the positive insulation resistance r2p and the negative insulation resistance r2n. The high-voltage platform B1 includes a first high-voltage sub-platform B11 and a second high-voltage sub-platform B12. The negative pole of B11 is connected to the positive pole of B12, and the first end of the first resistor R1 is connected to the first connection point of B11 and B12.

[0026] (1) Let r x = r1p||r1n||r2p||r2n, that is, the parallel value of r1p, r1n, r2p, and r2n, which is also the parallel value of the insulation resistances of the positive and negative poles to the ground of all high-voltage platforms in the insulation resistance detection device, that is, the parallel value of the insulation resistances of N high-voltage platforms.

[0027] (2) The voltage signal source DC outputs +E. After the value of the voltage measurement module U1 is stable, the voltage value u1 at the first end (i.e., the right end) of the second resistor R0 is measured (as Figure 2 shown).

[0028] According to the superposition principle, u1 is the superposition of the voltage signal source DC, the first high-voltage sub-platform B11, the second high-voltage sub-platform B12, and the high-voltage platform B2 acting alone, that is, u1 = U1_1 + U1_2 + U1_3 + U1_4, where, as Figures 3 to 6 shown, U1_1 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when the voltage signal source DC outputs +E and acts alone, U1_2 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when B11 acts alone, U1_3 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when B12 acts alone, and U1_4 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when B2 acts alone.

[0029] It should be noted that the superposition theorem of the circuit is: in a linear circuit, the voltage or current of any branch is equal to the superposition of the voltage and current generated by the independent power source acting alone on that branch.

[0030] (3) The voltage signal source DC outputs -E. After the value of the voltage measurement module U1 is stable, the voltage value u2 at the first end (i.e., the right end) of the second resistor R0 is measured.

[0031] Similarly, according to the superposition principle, u2 is the superposition of the separate actions of the voltage signal source DC, the first high-voltage sub-platform B11, the second high-voltage sub-platform B12, and the high-voltage platform B2, that is, u2 = U2_1 + U2_2 + U2_3 + U2_4, where U2_1 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when the voltage signal source DC outputs -E and acts alone, U2_2 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when B11 acts alone, U2_3 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when B12 acts alone, and U2_4 is the voltage value at the first end (i.e., the right end) of the second resistor R0 when B2 acts alone.

[0032] (4) From the equivalent circuit, it can be obtained that: U2_1 = -U1_1, U2_2 = U1_2, U2_3 = U1_3, U2_4 = U1_4. Therefore, u1 - u2 = U1_1 * 2, where it is obtained from the equivalent circuit Therefore, Furthermore, through derivation, it can be obtained that

[0033] Therefore, the processing module determines the parallel value of the insulation resistances of the two high-voltage platforms according to the voltage value E output by the voltage signal source DC, the resistance value of the first resistor R1, the resistance value of the second resistor R0, the voltage value u1 measured by the voltage measurement module U1 at the first end (i.e., the right end) of the second resistor R0 when the voltage signal source DC outputs +E received from the voltage measurement module, and the voltage value u2 measured by the voltage measurement module U1 at the first end (i.e., the right end) of the second resistor R0 when the voltage signal source DC outputs -E received from the voltage measurement module. Among them, the processing module can also be connected to the voltage signal source DC, and the processing module controls the magnitude of the voltage value E output by the voltage signal source DC. The resistance values of the first resistor R1 and the second resistor R0 can be pre-stored in the processing module, or the processing module receives the resistance values of the first resistor R1 and the second resistor R0 input from the outside.

[0034] It should be noted that when the number of high-voltage platforms included in the insulation resistance detection device is different, the compositions of the voltage values u1 and u2 at the first end (i.e., the right end) of the second resistor R0 measured by the voltage measurement module U1 are different. Similarly, when the insulation resistance detection device includes N high-voltage platforms, the processing module determines the parallel value of the insulation resistances of the N high-voltage platforms based on the voltage value E output by the voltage signal source DC, the resistance value of the first resistor R1, the resistance value of the second resistor R0, the voltage value u1 measured by the voltage measurement module U1 at the first end (i.e., the right end) of the second resistor R0 when the voltage signal source DC outputs +E received from the voltage measurement module, and the voltage value u2 measured by the voltage measurement module U1 at the first end (i.e., the right end) of the second resistor R0 when the voltage signal source DC outputs -E received from the voltage measurement module.

[0035] An embodiment of the present application provides a detection device for insulation resistance. The detection device for insulation resistance includes N high-voltage platforms, N positive insulation resistors, N negative insulation resistors, a processing module, a first resistor R1, a second resistor R0, a voltage signal source DC, and a voltage measurement module U1. The Nth high-voltage platform among the N high-voltage platforms is connected to any one of the previous (N - 1) high-voltage platforms through a positive or negative electrode. The first high-voltage platform among the N high-voltage platforms includes a first high-voltage sub-platform and a second high-voltage sub-platform. The negative electrode of the first high-voltage sub-platform is connected to the positive electrode of the second high-voltage sub-platform. One of the N positive insulation resistors is connected between the positive electrode of a high-voltage platform and the ground terminal. One of the N negative insulation resistors is connected between the negative electrode of a high-voltage platform and the ground terminal. The first resistor R1, the second resistor R0, the voltage signal source DC, and the voltage measurement module U1 form a detection circuit. The first end of the first resistor R1 is connected to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform. The second end of the first resistor R1 is connected to the first end of the second resistor R0. The second end of the second resistor R0 is connected to the positive electrode of the voltage signal source DC. The negative electrode of the voltage signal source DC is connected to the ground terminal. The first end of the voltage measurement module U1 is connected to the second connection point of the first resistor R1 and the second resistor R0. The second end of the voltage measurement module U1 is connected to the negative electrode of the voltage signal source DC. Then the processing module is connected to the voltage measurement module U1. The processing module is configured to determine the parallel value of the insulation resistances of the N high-voltage platforms according to the voltage value output by the voltage measurement module U1. That is, the present application can realize the detection of the parallel value of the insulation resistances of N high-voltage platforms through a detection circuit connected between the first high-voltage sub-platform and the second high-voltage sub-platform and a processing module connected to the voltage measurement module U1 in the detection circuit. Moreover, the device structure for realizing the detection of the parallel value of the insulation resistances of N high-voltage platforms in the present application is relatively simple.

[0036] In the present application, the above connection relationships are all electrical connection relationships. In addition, the voltage measurement module U1 in the present application can be composed of a signal conditioning circuit and an analog / digital converter (ADC). The signal conditioning circuit can be composed of an operational amplifier, a capacitor, a resistor, etc.

[0037] In one implementation, the processing module can be a processor or a processing system, and the present application does not make specific limitations on this.

[0038] In the embodiment of the present application, the first high-voltage platform may be the high-voltage platform with the highest voltage value among the N high-voltage platforms. That is to say, the first high-voltage platform with the highest voltage value among the N high-voltage platforms includes a first high-voltage sub-platform and a second high-voltage sub-platform. By connecting the first end of the first resistor in the detection circuit to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform in the high-voltage platform with the highest voltage value among the N high-voltage platforms, the insulation resistance condition of all the electrically connected high-voltage platforms in the insulation resistance detection device can be detected in real time.

[0039] In one implementation, the rated voltage value of the first high-voltage sub-platform may be the same as the rated voltage value of the second high-voltage sub-platform. Exemplarily, when the voltage value of the first high-voltage platform is 800V, the rated voltage values of both the first high-voltage sub-platform and the second high-voltage sub-platform are 400V. When the rated voltage values of the first high-voltage sub-platform and the second high-voltage sub-platform are the same, the voltage withstand requirement of the detection circuit is the lowest, which can reduce the cost of components.

[0040] In another possible implementation, the rated voltage value of the first high-voltage sub-platform may be different from the rated voltage value of the second high-voltage sub-platform. Exemplarily, when the voltage value of the first high-voltage platform is 800V, the rated voltage value of the first high-voltage sub-platform may be 300V, and the rated voltage value of the second high-voltage sub-platform may be 500V. When the rated voltage values of the first high-voltage sub-platform and the second high-voltage sub-platform are different, the voltage withstand requirement of the detection circuit is higher.

[0041] In addition, when the voltage value of the first high-voltage sub-platform is the same as the voltage value of the second high-voltage sub-platform, the maximum operating voltage of the first resistor is half of the voltage value of the first high-voltage platform.

[0042] In the embodiment of the present application, the insulation resistance detection device may further include a switching module. The first end of the switching module is connected to the first connection point, and the second end of the switching module is connected to the first end of the first resistor. That is to say, the detection circuit may further include a switching module. Connect the first end of the switching module to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform, and the second end of the switching module to the first end of the first resistor. When it is necessary to detect the parallel value of the insulation resistances of the N high-voltage platforms, turn on the switching module. When it is not necessary to detect the parallel value of the insulation resistances of the N high-voltage platforms or when the detection circuit needs to be repaired, turn off the switching module.

[0043] In one possible implementation, as Figure 1As shown, the on-off module can be a switch K. Exemplarily, the on-off module can be a semiconductor switch, and the semiconductor switch can be composed of a relay, a transistor, etc.

[0044] In another possible implementation, the on-off module can be a relay. Exemplarily, the on-off module can be an electromagnetic relay. By using an electromagnetic relay as the on-off module, the connection relationship is relatively simple.

[0045] In one implementation, when the rated voltage value of the first high-voltage sub-platform is the same as that of the second high-voltage sub-platform, the maximum operating voltage of the on-off module is half of the voltage value of the first high-voltage platform. At this time, the voltage withstand requirement of the on-off module is the lowest, which can reduce the cost of components.

[0046] The embodiment of the present application discloses a vehicle, including the insulation resistance detection device described in the above embodiment.

[0047] Figure 7 It is a schematic flowchart of a method for determining the value of the insulation resistance disclosed in the embodiment of the present application. As Figure 7 shown, the method for determining the value of the insulation resistance provided by the embodiment of the present application includes the following steps:

[0048] S720. Obtain the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor.

[0049] Among them, the first voltage value is the voltage value output by the voltage signal source, the second voltage value is the voltage value measured by the voltage measurement module when the first voltage value is positive, and the third voltage value is the voltage value measured by the voltage measurement module when the first voltage value is negative.

[0050] In the present application, the first voltage value can be the voltage value output by the voltage signal source controlled by the processing module. The second voltage value can be the voltage value of the first end (i.e., the right end) of the second resistor measured by the voltage measurement module when the voltage value output by the voltage signal source is positive (for example, +E). The third voltage value can be the voltage value of the first end (i.e., the right end) of the second resistor measured by the voltage measurement module when the voltage value output by the voltage signal source is negative (for example, -E). The resistance values of the first resistor and the second resistor can be pre-stored in the processing module, or the processing module receives the resistance values of the first resistor and the second resistor input from the outside.

[0051] S740. Determine the parallel value of the insulation resistances of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor.

[0052] In this application, the processing module can determine the parallel value of the insulation resistances of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor.

[0053] That is to say, the processing module can continuously receive the second voltage value and the third voltage value measured by the voltage measurement module, and determine the parallel value of the insulation resistances of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor.

[0054] The embodiment of this application provides a method for determining insulation resistance. By obtaining the first voltage value output by the voltage signal source, the second voltage value measured by the voltage measurement module when the first voltage value is positive, the third voltage value measured by the voltage measurement module when the first voltage value is negative, the resistance value of the first resistor, and the resistance value of the second resistor, and then determining the parallel value of the insulation resistances of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor, the monitoring of the parallel value of the insulation resistances of the N high-voltage platforms is realized.

[0055] When the parallel value of the insulation resistances of the N high-voltage platforms is determined, the parallel value of the insulation resistances of the N high-voltage platforms can be compared with the warning resistance value. When the parallel value of the insulation resistances of the N high-voltage platforms is less than the warning resistance value, a safety warning is given. Among them, the warning resistance value can be determined according to the voltage value of the high-voltage platform with the highest voltage value among the N high-voltage platforms and the warning value of the national standard.

[0056] In one implementation, the determining the parallel value of the insulation resistances of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor may include: determining the parallel value of the insulation resistances of the N high-voltage platforms through the following formula; where r x is the parallel value of the insulation resistances of the N high-voltage platforms, E is the first voltage value, u1 is the second voltage value, u2 is the third voltage value, R0 is the second resistance value, and R1 is the first resistance value.

[0057] It should be noted that the above-described insulation voltage detection device and the method for determining the insulation resistance value can also be used in other scenarios where there are multiple high-voltage platforms that need to be isolated from the ground (i.e., insulation resistance detection is required), such as solar power supplies, industrial DC power supplies, etc. The insulation resistance can be detected by the method described in the above embodiments.

[0058] Optionally, as Figure 8 shown, an embodiment of the present application further provides an electronic device 800, including a processor 801 and a memory 802. A program or instruction that can run on the processor 801 is stored on the memory 802. When the program or instruction is executed by the processor 801, it implements each step of the embodiment of the method for determining the insulation resistance value described above, and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0059] An embodiment of the present application further provides a readable storage medium. A program or instruction is stored on the readable storage medium. When the program or instruction is executed by a processor, it implements each process of the embodiment of the method for determining the insulation resistance value described above, and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0060] Among them, the processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disks, or optical discs.

[0061] In the above embodiments of the present application, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0062] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A detecting device for insulation resistance, characterized in that, Including: N high-voltage platforms, N positive insulation resistors, N negative insulation resistors, a processing module, a first resistor, a second resistor, a voltage signal source, and a voltage measurement module, where N is an integer greater than or equal to 2, and: The Nth high-voltage platform among the N high-voltage platforms is connected to any one of the previous (N - 1) high-voltage platforms through a positive or negative pole. The first high-voltage platform among the N high-voltage platforms includes a first high-voltage sub-platform and a second high-voltage sub-platform, and the negative pole of the first high-voltage sub-platform is connected to the positive pole of the second high-voltage sub-platform; One of the N positive insulation resistors is connected between the positive pole of a high-voltage platform and the ground terminal; One of the N negative insulation resistors is connected between the negative pole of a high-voltage platform and the ground terminal; The first end of the first resistor is connected to the first connection point of the first high-voltage sub-platform and the second high-voltage sub-platform, and the second end of the first resistor is connected to the first end of the second resistor; The second end of the second resistor is connected to the positive pole of the voltage signal source; The negative pole of the voltage signal source is connected to the ground terminal; The first end of the voltage measurement module is connected to the second connection point of the first resistor and the second resistor, and the second end of the voltage measurement module is connected to the negative pole of the voltage signal source; The processing module is connected to the voltage measurement module, and the processing module is used to determine the parallel value of the insulation resistors of the N high-voltage platforms according to the voltage value output by the voltage measurement module.

2. The insulation resistance detection device according to claim 1, wherein, The first high-voltage platform is the high-voltage platform with the highest voltage value among the N high-voltage platforms.

3. The insulation resistance detection device according to claim 1, characterized in that, The rated voltage value of the first high-voltage sub-platform is the same as the rated voltage value of the second high-voltage sub-platform.

4. The detecting device for insulation resistance according to claim 3, wherein The insulation resistor detection device further includes a switching module. The first end of the switching module is connected to the first connection point, and the second end of the switching module is connected to the first end of the first resistor.

5. The insulation resistance detection device according to claim 4, characterized in that, The switching module is a switch.

6. The insulation resistance detection device according to claim 4, characterized in that, The switching module is a relay.

7. The detecting device for insulation resistance according to claim 4, characterized in that, The maximum operating voltage of the switching module is half of the voltage value of the first high-voltage platform.

8. A vehicle, characterized in that, Including the insulation resistor detection device according to any one of claims 1 to 7.

9. A method for determining the insulation resistance value, characterized in that, Applied to the insulation resistor detection device according to any one of claims 1 to 7, the determination method includes: Obtaining a first voltage value, a second voltage value, a third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor, where the first voltage value is the voltage value output by the voltage signal source, the second voltage value is the voltage value measured by the voltage measurement module when the first voltage value is positive, and the third voltage value is the voltage value measured by the voltage measurement module when the first voltage value is negative; Determining the parallel value of the insulation resistors of the N high-voltage platforms according to the first voltage value, the second voltage value, the third voltage value, the resistance value of the first resistor, and the resistance value of the second resistor.

10. The determination method according to claim 9, wherein Determining a parallel value of insulation resistances of the N high voltage platforms according to the first voltage value, the second voltage value, the third voltage value, a resistance value of the first resistor, and a resistance value of the second resistor includes: Determining the parallel value of the insulation resistances of the N high voltage platforms through the following formula; where r x is the parallel value of the insulation resistances of the N high-voltage platforms, E is the first voltage value, u1 is the second voltage value, u2 is the third voltage value, R0 is the second resistance value, and R1 is the first resistance value.

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