Insulation detection circuit, insulation detection method, device and electronic equipment

Abstract

The application discloses an insulation detection circuit, an insulation detection method and device and electronic equipment, and relates to the field of electric vehicles and charging piles. The application comprises a direct-current voltage source, two ends of the direct-current voltage source are connected with one end of a first voltage dividing mechanism and one end of a second voltage dividing mechanism through a first controllable mechanism and a second controllable mechanism respectively, the other end of the first voltage dividing mechanism and the other end of the second voltage dividing mechanism are connected with a reference ground through a third voltage dividing mechanism, the reference ground is also connected with the ground through a third controllable mechanism, and the two ends of the direct-current voltage source are also connected with a fourth voltage dividing mechanism and a fifth voltage dividing mechanism respectively. By applying the technical scheme, the insulation detection cost can be reduced, and the detection precision of the insulation resistance can be improved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicles and charging piles, and in particular to an insulation detection circuit, insulation detection method, device and electronic equipment. Background Technology

[0002] Insulation testing is required for both electric vehicles and charging stations during the charging process to ensure reliable insulation and thus guarantee the personal safety of users during charging or use.

[0003] Currently, existing insulation detection circuits require two sampling circuits to separately collect the voltage across the resistor when acquiring voltage, which increases the cost of insulation detection. In addition, the large number of components in the two sampling circuits increases the risk of failure. Furthermore, the consistency between the two sampling circuits is difficult to guarantee, which affects the accuracy of insulation resistance detection. Summary of the Invention

[0004] This invention provides an insulation testing circuit, insulation testing method, device, and electronic equipment, which mainly reduces the cost of insulation testing, improves the accuracy of insulation resistance testing, and reduces the risk of failure.

[0005] According to a first aspect of the present invention, an insulation detection circuit is provided, comprising: a DC voltage source, the two ends of the DC voltage source being connected to one end of a first voltage divider mechanism and one end of a second voltage divider mechanism respectively via a first controllable mechanism and a second controllable mechanism; the other ends of the first voltage divider mechanism and the other ends of the second voltage divider mechanism being connected to a reference ground via a third voltage divider mechanism; the reference ground being further connected to ground via the third controllable mechanism; and the two ends of the DC voltage source being further connected to a fourth voltage divider mechanism and a fifth voltage divider mechanism respectively.

[0006] According to a second aspect of the present invention, an insulation testing method is provided, comprising:

[0007] By controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open, the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider mechanism are collected respectively.

[0008] The insulation resistance value is calculated based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value.

[0009] According to a third aspect of the present invention, an insulation detection device is provided, comprising:

[0010] The acquisition unit is used to acquire the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider by controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open.

[0011] The calculation unit is used to calculate the insulation resistance value based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value and the third voltage value.

[0012] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0013] By controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open, the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider mechanism are collected respectively.

[0014] The insulation resistance value is calculated based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value.

[0015] According to a fifth aspect of the present invention, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, performs the following steps:

[0016] By controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open, the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider mechanism are collected respectively.

[0017] The insulation resistance value is calculated based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value.

[0018] According to a sixth aspect of the present invention, a vehicle is provided, comprising: electronic equipment as described in the fifth aspect.

[0019] This invention provides an insulation detection circuit, which, compared to existing insulation detection circuits, includes: a DC voltage source, the two ends of which are respectively connected to one end of a first voltage divider mechanism and one end of a second voltage divider mechanism via a first controllable mechanism and a second controllable mechanism, respectively; the other ends of the first voltage divider mechanism and the other ends of the second voltage divider mechanism are connected to a reference ground via a third voltage divider mechanism; the reference ground is also connected to ground via the third controllable mechanism; and the two ends of the DC voltage source are also respectively connected to a fourth voltage divider mechanism and a fifth voltage divider mechanism. Because the insulation detection circuit provided by this invention only requires one sampling circuit to collect the voltage value across the third voltage divider mechanism during insulation detection, it can reduce the cost of insulation detection. Furthermore, since one sampling circuit has better consistency and is easier to calibrate during design, it can improve the detection accuracy of insulation resistance. In addition, because one sampling circuit reduces the number of sampling circuit components, it reduces the risk of failure. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This diagram illustrates an insulation detection circuit according to an embodiment of the present invention.

[0022] Figure 2 This diagram illustrates another insulation detection circuit provided by an embodiment of the present invention.

[0023] Figure 3 This diagram illustrates yet another insulation detection circuit provided by an embodiment of the present invention;

[0024] Figure 4 This diagram illustrates a flow chart of an insulation testing method provided by an embodiment of the present invention.

[0025] Figure 5 This diagram illustrates the structure of an insulation detection device according to an embodiment of the present invention.

[0026] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention is shown. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0028] Currently, existing insulation detection circuits require two sampling circuits to separately collect the voltage across the resistor when acquiring voltage, which increases the cost of insulation detection. In addition, the large number of components in the two sampling circuits increases the risk of failure. Furthermore, the consistency between the two sampling circuits is difficult to guarantee, which affects the accuracy of insulation resistance detection.

[0029] To address the aforementioned problems, this invention provides an insulation detection circuit, comprising: a DC voltage source, the two ends of which are respectively connected to one end of a first voltage divider mechanism and one end of a second voltage divider mechanism via a first controllable mechanism and a second controllable mechanism, respectively; the other ends of the first voltage divider mechanism and the other ends of the second voltage divider mechanism are connected to a reference ground via a third voltage divider mechanism; the reference ground is also connected to earth via the third controllable mechanism; and the two ends of the DC voltage source are further connected to a fourth voltage divider mechanism and a fifth voltage divider mechanism, respectively. Specifically, the DC voltage source can be a high-voltage DC voltage source.

[0030] Furthermore, such as Figure 1 As shown, the first voltage divider mechanism includes a first resistor R1, the second voltage divider mechanism includes a second resistor R2, the third voltage divider mechanism includes a third resistor R0, the fourth voltage divider mechanism includes a fourth resistor R3, and the fifth voltage divider mechanism includes a fifth resistor R4. The two ends of the DC voltage source are respectively connected to one end of the first resistor R1 and one end of the second resistor R2 through a first controllable mechanism and a second controllable mechanism, respectively. The other ends of the first resistor R1 and the other ends of the second resistor R2 are connected to the reference ground GND through the third resistor R0. The two ends of the DC voltage source are also respectively connected to one end of the fourth resistor R3 and one end of the fifth resistor R4. The other ends of the fourth resistor R3 and the other ends of the fifth resistor R4 are connected to the reference ground.

[0031] Furthermore, such as Figure 1 As shown, the first controllable mechanism includes a first DC relay K1, the second controllable mechanism includes a second DC relay K3, and the third controllable mechanism includes a third DC relay K2. The two ends of the DC voltage source are respectively connected to one end of the first voltage divider mechanism and one end of the second voltage divider mechanism through the first DC relay K1 and the second DC relay K3. The reference ground is connected to the earth through the third DC relay K2. Specifically, the first DC relay K1, the second DC relay K3, and the third DC relay K2 can be high-voltage DC relays.

[0032] Specifically, in Figure 1In this circuit, Vdc is connected to a high-voltage DC power source. Rx and Ry represent the insulation resistance between the high-voltage equipment and the earth (PE). The connection point of Rx and Ry is connected to the earth (PE). The reference ground of the insulation detection circuit is GND. The positive terminal of the high-voltage DC power source is connected to one end of the first resistor R1 via the first DC relay K1. The other end of the first resistor R1 is connected to one end of the third resistor R0. The other end of the third resistor R0 is connected to the reference ground GND. The negative terminal of the high-voltage DC power source is connected to one end of the second resistor R2 via the second DC relay K3. The other end of the second resistor R2 is connected to one end of the third resistor R0. The other end of the third resistor R0 is connected to the reference ground GND. The reference ground GND is also connected to the earth (PE) via the third DC relay K2. The two ends of the high-voltage DC power source are also connected to one end of the fourth resistor R3 and one end of the fifth resistor R4, respectively. The other ends of the fourth resistor R3 and the fifth resistor R4 are connected to the reference ground GND.

[0033] Furthermore, the circuit further includes: a driving circuit, a sampling circuit, and a control module. One end of the driving circuit is connected to the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism, respectively, and the other end of the driving circuit is connected to the control module. Both ends of the sampling circuit are connected to the third voltage divider mechanism and the control module, respectively. The control module is used to issue insulation detection commands to the driving circuit and the sampling circuit. The driving circuit is used to control the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to open or close according to the insulation detection commands. The sampling circuit is used to... When the first controllable mechanism is closed and the second and third controllable mechanisms are open, a first voltage value is acquired across the third voltage divider mechanism; when the first and third controllable mechanisms are closed and the second controllable mechanism is open, a second voltage value is acquired across the third voltage divider mechanism; when the first controllable mechanism is open and the second and third controllable mechanisms are closed, a third voltage value is acquired across the third voltage divider mechanism; the first, second, and third voltage values ​​are sent to the control module; the control module is further configured to calculate the insulation resistance value based on the first, second, and third voltage values. Specifically, the driving circuit can be a relay driving circuit.

[0034] Specifically, in Figure 2In this circuit, one end of the relay drive circuit is connected to the first DC relay K1, the second DC relay K3, and the third DC relay K2, respectively, and the other end of the relay drive circuit is connected to the control module. One end of the sampling circuit is connected to the third resistor R0, and the other end of the sampling circuit is connected to the control module. Before the insulation detection begins, the first DC relay K1, the second DC relay K3, and the third DC relay K2 are all in the open state. When the control module sends an insulation detection command to the relay drive circuit and the sampling circuit, the relay drive circuit will, according to the insulation detection command, first control the first DC relay K1 to close and the second DC relay K3 and the third DC relay K2 to open. Then, the sampling circuit will, according to the insulation detection command, collect the first voltage value across the third resistor R0 in the current state. Immediately afterwards, the relay drive circuit will control the first DC relay K1 and the third DC relay K2 to close and the second DC relay K3 to open, and the sampling circuit will collect the second voltage value across the third resistor R0 in the current state. Furthermore, the relay drive circuit continues to control the first DC relay K1 to open and the second DC relay K3 and the third DC relay K2 to close, so that the sampling circuit can collect the third voltage value across the third resistor R0 in the current state. After collecting the first, second, and third voltage values ​​across the third resistor R0, the sampling circuit will send these values ​​to the control module. The control module will then calculate the insulation resistance value based on these values ​​to achieve insulation detection.

[0035] Furthermore, the driving circuit includes a first driving circuit, a second driving circuit, and a third driving circuit. One end of the first driving circuit, the second driving circuit, and the third driving circuit are respectively connected to the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism, and the other end of the first driving circuit, the second driving circuit, and the third driving circuit are respectively connected to the control module.

[0036] Specifically, such as Figure 2As shown, the relay driving circuit may include a first relay driving circuit, a second relay driving circuit, and a third relay driving circuit. The two ends of the first relay driving circuit (relay driving circuit 1) are connected to the drive coil terminal of the first DC relay K1 and the control module, respectively. The two ends of the second relay driving circuit (relay driving circuit 3) are connected to the drive coil terminal of the second DC relay K3 and the control module, respectively. The two ends of the third relay driving circuit (relay driving circuit 2) are connected to the drive coil terminal of the third DC relay K2 and the control module, respectively. The first relay driving circuit (relay driving circuit 1), the second relay driving circuit (relay driving circuit 3), and the third relay driving circuit (relay driving circuit 2) are used to control the opening and closing of the first DC relay K1, the second DC relay K3, and the third DC relay K2, respectively.

[0037] Furthermore, the control module includes a first microcontroller, the sampling circuit includes an isolated sampling circuit, the other end of the drive circuit is connected to the first microcontroller module, and the two ends of the isolated sampling circuit are respectively connected to the third voltage divider mechanism and the first microcontroller module.

[0038] Specifically, such as Figure 2 As shown, one end of the first relay drive circuit (relay drive circuit 1), one end of the second relay drive circuit (relay drive circuit 3), and one end of the third relay drive circuit (relay drive circuit 2) are respectively connected to the first microcontroller. The two ends of the isolation sampling circuit are respectively connected to the third resistor R0 and the first microcontroller. The first microcontroller is used to issue insulation detection commands. The first relay drive circuit (relay drive circuit 1), the second relay drive circuit (relay drive circuit 3), and the third relay drive circuit (relay drive circuit 2) are used to control the opening and closing of the first DC relay K1, the second DC relay K3, and the third DC relay K2 according to the insulation detection commands. The isolation sampling circuit is used to collect the first, second, and third voltage values ​​across the third resistor R0 and send them to the first microcontroller. The first microcontroller calculates the insulation resistance value based on these first, second, and third voltage values.

[0039] Furthermore, the circuit also includes a digitally isolated communication circuit. The control module includes a second microcontroller and a third microcontroller. The sampling circuit includes a non-isolated sampling circuit, with its two ends connected to the third voltage divider mechanism and the second microcontroller, respectively. The second microcontroller is also connected to the third microcontroller via the digitally isolated communication circuit. The third microcontroller is used to send an insulation detection command to the digitally isolated communication circuit. The digitally isolated communication circuit is used to send the insulation detection command to the second microcontroller. The second microcontroller is used to control the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to open or close according to the insulation detection command, and to obtain the first voltage value, the second voltage value, and the third voltage value through the non-isolated sampling circuit, and to send the first voltage value, the second voltage value, and the third voltage value to the third microcontroller through the digitally isolated communication circuit. The third microcontroller is used to calculate the insulation resistance value based on the first voltage value, the second voltage value, and the third voltage value.

[0040] Specifically, such as Figure 3 As shown, the two ends of the non-isolated sampling circuit are connected to the third resistor R0 and the second microcontroller, respectively. The second microcontroller is also connected to the third microcontroller via a digitally isolated communication circuit. The third microcontroller sends an insulation detection command to the digitally isolated communication circuit. Upon receiving the insulation detection command, the digitally isolated communication circuit forwards it to the second microcontroller. Upon receiving the insulation detection command, the second microcontroller controls the first DC relay K1, the second DC relay K3, and the third DC relay K2 to open or close via the first relay drive circuit (relay drive circuit 1), the second relay drive circuit (relay drive circuit 3), and the third relay drive circuit (relay drive circuit 2). Simultaneously, the non-isolated sampling circuit collects the first, second, and third voltage values ​​across the third resistor R0 and sends them to the second microcontroller. Upon receiving the first, second, and third voltage values, the second microcontroller sends them back to the third microcontroller via the digitally isolated communication circuit, so that the third microcontroller can calculate the insulation resistance value based on these values.

[0041] Since the insulation detection circuit provided in this embodiment of the invention only needs one sampling circuit to collect the voltage value at both ends of the third voltage divider mechanism when performing insulation detection, the insulation detection cost can be reduced. At the same time, since one sampling circuit has better consistency, it is also easier to perform calibration and other processing in the design, thus improving the detection accuracy of insulation resistance. In addition, since one sampling circuit reduces the number of sampling circuit components, the risk of failure is reduced.

[0042] Meanwhile, embodiments of the present invention also provide an insulation testing method that can improve insulation testing accuracy and reduce insulation testing costs, such as... Figure 4 As shown, the method includes:

[0043] 101. By controlling the first controllable mechanism, the second controllable mechanism and the third controllable mechanism to close or open, the first voltage value, the second voltage value and the third voltage value at both ends of the third voltage divider mechanism are collected respectively.

[0044] The first controllable mechanism includes a first DC relay K1, the second controllable mechanism includes a second DC relay K3, the third controllable mechanism includes a third DC relay K2, and the third voltage divider mechanism includes a third resistor R0.

[0045] In this embodiment of the invention, the control module can control the first DC relay K1, the second DC relay K3, and the third DC relay K2 to close or open respectively via the relay driving circuit. Before the insulation detection begins, the first DC relay K1, the second DC relay K3, and the third DC relay K2 are all in the open state. When the control module sends an insulation detection command to the relay driving circuit and the sampling circuit, the relay driving circuit will, according to the insulation detection command, first control the first DC relay K1 to close, while keeping the second DC relay K3 and the third DC relay K2 open. Then, the sampling circuit will, according to the insulation detection command, collect the first voltage value across the third resistor R0 in the current state. Immediately afterwards, the relay driving circuit will control the third DC relay K2 to close, while keeping the first DC relay K1 closed and the second DC relay K3 open, and the sampling circuit will collect the second voltage value across the third resistor R0 in the current state. Further, the relay driving circuit continues to control the first DC relay K1 to open, the second DC relay K3 to close, while keeping the third DC relay K2 closed, and the sampling circuit will collect the third voltage value across the third resistor R0 in the current state.

[0046] After acquiring the first, second, and third voltage values ​​across the third resistor R0, the sampling circuit sends these values ​​to the control module. This allows... Figure 2 or Figure 3 The circuit shown can obtain the first voltage value, the second voltage value, and the third voltage value across the third resistor R0.

[0047] 102. Based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value, calculate the insulation resistance value.

[0048] The first voltage divider mechanism includes a first resistor R1, the second voltage divider mechanism includes a second resistor R2, the third voltage divider mechanism includes a third resistor R0, the fourth voltage divider mechanism includes a fourth resistor R3, and the fifth voltage divider mechanism includes a fifth resistor R4. The resistance values ​​are specifically resistor values. Since... Figure 1 The resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R0, the fourth resistor R3, and the fifth resistor R4 are all known. Therefore, the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R0, the fourth resistor R3, and the fifth resistor R4 can be obtained respectively, so as to calculate the insulation detection resistance value using the above resistance values.

[0049] In this embodiment of the invention, to calculate the insulation resistance value, step 103 specifically includes: calculating the output voltage based on the resistance values ​​corresponding to the first voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, and the first voltage value; and calculating the insulation resistance value based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, and the output voltage, the second voltage value, and the third voltage value.

[0050] Further, the step of calculating the insulation resistance value based on the resistance values ​​corresponding to the first, second, third, fourth, and fifth voltage dividers, as well as the output voltage, the second voltage value, and the third voltage value, includes: calculating a first insulation resistance value based on the resistance values ​​corresponding to the first, third, and fourth voltage dividers, as well as the output voltage, the second voltage value, and the third voltage value; calculating a second insulation resistance value based on the resistance values ​​corresponding to the second, third, and fifth voltage dividers, as well as the output voltage, the second voltage value, and the third voltage value; and adding the first insulation resistance value and the second insulation resistance value to obtain the insulation resistance value.

[0051] Specifically, after obtaining the first voltage value across the third resistor R0, the output voltage across Vdc can be calculated based on this first voltage value, using the following formula:

[0052]

[0053] In this equation, the resistance values ​​of the first resistor R1, the third resistor R0, the fourth resistor R3, and the fifth resistor R4 are all known, and V1 is the first voltage value across the third resistor R0. Therefore, the output voltage Vdc can be calculated using the formula described above.

[0054] Furthermore, based on the output voltage Vdc and the second and third voltage values ​​across the third resistor, the first and second insulation resistance values ​​can be calculated using the following formulas:

[0055]

[0056]

[0057] Where Rx and Ry are the first and second insulation resistance values, respectively, V2p and V2n are the second and third voltage values ​​across the third resistor, respectively, and the second resistance R2 is known. Therefore, the first and second insulation resistance values ​​can be calculated using the above formula. Furthermore, adding the first insulation resistance value Rx and the second insulation resistance value Ry yields the final insulation resistance value.

[0058] Because the embodiments of the present invention cover the measurement of insulation resistance across the entire range, and the calculation formula does not involve any approximations, there is no calculation error, resulting in higher detection accuracy. Furthermore, the embodiments of the present invention can still calculate an approximately infinite insulation resistance even when the actual insulation resistance is infinite, and can still calculate an accurate insulation resistance using the given formula when the insulation resistance is balanced. The calculation formulas of the embodiments of the present invention are also relatively simple.

[0059] Compared to existing insulation testing methods, this invention reduces the number of high-voltage DC relay switching operations by two. The entire process requires only two switching operations (opening and closing) for each high-voltage DC relay, totaling six switching operations. In contrast, traditional insulation testing methods require at least eight switching operations between the two voltage acquisition units, with one high-voltage DC relay sometimes requiring four switching operations to achieve insulation testing. The number of high-voltage DC relay switching operations determines the system's lifespan. Because this invention involves fewer total switching operations and each high-voltage DC relay requires the same number of switching operations (twice), it offers a longer system lifespan compared to traditional insulation testing methods.

[0060] This invention provides an insulation detection method that can acquire the first, second, and third voltage values ​​across a third voltage divider mechanism. Based on the resistance values ​​corresponding to the first, second, third, fourth, and fifth voltage dividers, and the first, second, and third voltage values, the insulation resistance value is calculated. Since this invention requires only one sampling circuit to acquire the voltage values ​​across the third voltage divider mechanism, the cost of insulation detection is reduced. Furthermore, because a single sampling circuit offers better consistency and is easier to calibrate during design, the accuracy of insulation resistance detection is improved. Additionally, the reduced number of sampling circuit components lowers the risk of failure.

[0061] Furthermore, as Figure 4 In specific implementation, embodiments of the present invention provide an insulation detection device, such as... Figure 5 As shown, the device includes: a data acquisition unit 21 and a computing unit 22.

[0062] The acquisition unit 21 can be used to acquire the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider by controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open.

[0063] The calculation unit 22 can be used to calculate the insulation resistance value based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value and the third voltage value.

[0064] In a specific application scenario, the computing unit 23 includes: a first computing module and a second computing module.

[0065] The first calculation module can be used to calculate the output voltage based on the resistance values ​​corresponding to the first voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism and the fifth voltage divider mechanism, and the first voltage value.

[0066] The second calculation module can be used to calculate the insulation resistance value based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism and the fifth voltage divider mechanism, as well as the output voltage, the second voltage value and the third voltage value.

[0067] In a specific application scenario, the second calculation module can be used to calculate a first insulation resistance value based on the resistance values ​​corresponding to the first, third, and fourth voltage dividers, as well as the output voltage, the second voltage value, and the third voltage value; calculate a second insulation resistance value based on the resistance values ​​corresponding to the second, third, and fifth voltage dividers, as well as the output voltage, the second voltage value, and the third voltage value; and add the first insulation resistance value and the second insulation resistance value to obtain the insulation resistance value.

[0068] It should be noted that other corresponding descriptions of the functional modules involved in the insulation detection device provided in this embodiment of the invention can be found in [reference needed]. Figure 4 The corresponding description of the method shown will not be repeated here.

[0069] Based on the above, Figure 4Accordingly, this embodiment of the invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the following steps: by controlling the first, second, and third controllable mechanisms to close or open, acquiring the first, second, and third voltage values ​​at both ends of the third voltage divider mechanism, respectively; and calculating the insulation resistance value based on the resistance values ​​corresponding to the first, second, third, fourth, and fifth voltage dividers, as well as the first, second, and third voltage values.

[0070] Based on the above, Figure 4 The method shown and as Figure 5 The embodiment of the device shown in the invention also provides a physical structural diagram of an electronic device, such as... Figure 6 As shown, the electronic device includes: a processor 31, a memory 32, and a computer program stored in the memory 32 and executable on the processor. Both the memory 32 and the processor 31 are mounted on a bus 33. When the processor 31 executes the program, it performs the following steps: by controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open, it collects the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider mechanism, respectively; based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value, it calculates the insulation resistance value.

[0071] The technical solution of this invention can acquire the first, second, and third voltage values ​​across the third voltage divider mechanism, and calculate the insulation resistance value based on the resistance values ​​corresponding to the first, second, third, fourth, and fifth voltage dividers, as well as the first, second, and third voltage values. Since this invention requires only one sampling circuit to acquire the voltage values ​​across the third voltage divider mechanism, the cost of insulation testing can be reduced. Furthermore, because a single sampling circuit has better consistency and is easier to calibrate during design, the accuracy of insulation resistance detection can be improved. In addition, the reduced number of sampling circuit components reduces the risk of failure.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An insulation detection circuit, characterized in that, include: A DC voltage source is provided, with its two ends connected to one end of a first voltage divider and one end of a second voltage divider via a first controllable mechanism and a second controllable mechanism, respectively. The other ends of the first and second voltage dividers are connected to a reference ground via a third voltage divider. The reference ground is also connected to ground via a third controllable mechanism. The two ends of the DC voltage source are also connected to a fourth and a fifth voltage divider, respectively. Each of the first, second, and third controllable mechanisms has an independent control terminal. The circuit further includes a control module with three independent control output terminals, each connected to one of the control terminals of the first, second, and third controllable mechanisms. Between the reference ground and the earth, there is a direct electrical connection only formed by the third controllable mechanism; The circuit further includes a driving circuit, a sampling circuit, and a control module. One end of the driving circuit is connected to the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism, respectively, and the other end of the driving circuit is connected to the control module. The two ends of the sampling circuit are connected to the third voltage divider mechanism and the control module, respectively. The control module is used to send insulation detection commands to the drive circuit and the sampling circuit; The driving circuit is used to control the first controllable mechanism, the second controllable mechanism and the third controllable mechanism to open or close respectively according to the insulation detection command; The sampling circuit is configured to: acquire a first voltage value across the third voltage divider when the first controllable mechanism is closed and the second and third controllable mechanisms are open; acquire a second voltage value across the third voltage divider when the first and third controllable mechanisms are closed and the second controllable mechanism is open; acquire a third voltage value across the third voltage divider when the first controllable mechanism is open and the second and third controllable mechanisms are closed; and send the first, second, and third voltage values ​​to the control module. The control module is also used to calculate the insulation resistance value based on the first voltage value, the second voltage value, and the third voltage value.

2. The circuit according to claim 1, characterized in that, The first voltage divider mechanism includes a first resistor, the second voltage divider mechanism includes a second resistor, the third voltage divider mechanism includes a third resistor, the fourth voltage divider mechanism includes a fourth resistor, and the fifth voltage divider mechanism includes a fifth resistor. The two ends of the DC voltage source are respectively connected to one end of the first resistor and one end of the second resistor through the first controllable mechanism and the second controllable mechanism, respectively. The other ends of the first resistor and the second resistor are connected to the reference ground through the third resistor. The two ends of the DC voltage source are also respectively connected to one end of the fourth resistor and one end of the fifth resistor. The other ends of the fourth resistor and the fifth resistor are connected to the reference ground.

3. The circuit according to claim 1 or 2, characterized in that, The first controllable mechanism includes a first DC relay, the second controllable mechanism includes a second DC relay, and the third controllable mechanism includes a third DC relay. The two ends of the DC voltage source are respectively connected to one end of the first voltage divider mechanism and one end of the second voltage divider mechanism through the first DC relay and the second DC relay, and the reference ground is connected to the ground through the third DC relay.

4. The circuit according to claim 1, characterized in that, The driving circuit includes a first driving circuit, a second driving circuit, and a third driving circuit. One end of the first driving circuit, the second driving circuit, and the third driving circuit is connected to the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism, respectively, and the other end of the first driving circuit, the second driving circuit, and the third driving circuit is connected to the control module, respectively.

5. The circuit according to claim 1 or 4, characterized in that, The control module includes a first microcontroller, and the sampling circuit includes an isolated sampling circuit. The other end of the driving circuit is connected to the first microcontroller, and the two ends of the isolation sampling circuit are respectively connected to the third voltage divider mechanism and the first microcontroller.

6. The circuit according to claim 1 or 4, characterized in that, The circuit also includes a digitally isolated communication circuit, the control module includes a second microcontroller and a third microcontroller, and the sampling circuit includes a non-isolated sampling circuit. The two ends of the non-isolated sampling circuit are respectively connected to the third voltage divider mechanism and the second microcontroller. The second microcontroller is also connected to the third microcontroller through the digital isolation communication circuit. The third microcontroller is used to send insulation detection commands to the digital isolation communication circuit; The digital isolation communication circuit is used to send the insulation detection command to the second microcontroller; The second microcontroller is configured to control the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to open or close according to the insulation detection command, and to acquire the first voltage value, the second voltage value, and the third voltage value through the non-isolated sampling circuit, and to send the first voltage value, the second voltage value, and the third voltage value to the third microcontroller through the digital isolated communication circuit. The third microcontroller is used to calculate the insulation resistance value based on the first voltage value, the second voltage value, and the third voltage value.

7. An insulation testing method, characterized in that, The insulation detection circuit according to any one of claims 1 to 6 comprises: By controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open, the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider mechanism are collected respectively. The insulation resistance value is calculated based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value.

8. The method according to claim 7, characterized in that, The calculation of the insulation resistance value based on the resistance values ​​corresponding to the first, second, third, fourth, and fifth voltage dividers, and the first, second, and third voltage values, includes: The output voltage is calculated based on the resistance values ​​of the first voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value. The insulation resistance value is calculated based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the output voltage, the second voltage value, and the third voltage value.

9. The method according to claim 8, characterized in that, The step of calculating the insulation resistance value based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the output voltage, the second voltage value, and the third voltage value, includes: The first insulation resistance value is calculated based on the resistance values ​​corresponding to the first voltage divider mechanism, the third voltage divider mechanism, and the fourth voltage divider mechanism, as well as the output voltage, the second voltage value, and the third voltage value. The second insulation resistance value is calculated based on the resistance values ​​corresponding to the second voltage divider mechanism, the third voltage divider mechanism, and the fifth voltage divider mechanism, as well as the output voltage, the second voltage value, and the third voltage value. The insulation resistance value is obtained by adding the first insulation resistance value and the second insulation resistance value.

10. An insulation detection device, applied to the insulation detection circuit as described in claim 1, characterized in that, include: The acquisition unit is used to acquire the first voltage value, the second voltage value, and the third voltage value at both ends of the third voltage divider by controlling the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism to close or open. The calculation unit is used to calculate the insulation resistance value based on the resistance values ​​corresponding to the first voltage divider mechanism, the second voltage divider mechanism, the third voltage divider mechanism, the fourth voltage divider mechanism, and the fifth voltage divider mechanism, as well as the first voltage value, the second voltage value, and the third voltage value; the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism each have independent control terminals; the circuit also includes a control module, which has three independent control output terminals, respectively connected to the control terminals of the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism; Between the reference ground and the earth, there is a direct electrical connection only formed by the third controllable mechanism; The circuit further includes a driving circuit, a sampling circuit, and a control module. One end of the driving circuit is connected to the first controllable mechanism, the second controllable mechanism, and the third controllable mechanism, respectively, and the other end of the driving circuit is connected to the control module. The two ends of the sampling circuit are connected to the third voltage divider mechanism and the control module, respectively. The control module is used to send insulation detection commands to the drive circuit and the sampling circuit; The driving circuit is used to control the first controllable mechanism, the second controllable mechanism and the third controllable mechanism to open or close respectively according to the insulation detection command; The sampling circuit is configured to: acquire a first voltage value across the third voltage divider when the first controllable mechanism is closed and the second and third controllable mechanisms are open; acquire a second voltage value across the third voltage divider when the first and third controllable mechanisms are closed and the second controllable mechanism is open; acquire a third voltage value across the third voltage divider when the first controllable mechanism is open and the second and third controllable mechanisms are closed; and send the first, second, and third voltage values ​​to the control module. The control module is also used to calculate the insulation resistance value based on the first voltage value, the second voltage value, and the third voltage value.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 7 to 9.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 7 to 9.

13. A vehicle, characterized in that, include: The electronic device as claimed in claim 12.

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