Insulation resistance detection circuit and new energy vehicle

Abstract

The utility model discloses an insulation impedance detection circuit and a new energy vehicle. The utility model relates to the field of new energy vehicles, which comprises a first impedance detection circuit arranged on the low-voltage side of the new energy vehicle, a second impedance detection circuit arranged on the high-voltage side of the new energy vehicle, and a logic judgment module, the first impedance detection circuit is connected with a first component arranged on the low-voltage side and a second component arranged on the high-voltage side; the second impedance detection circuit is respectively connected with the first component and the second component; and the logic judgment module is respectively connected with the first impedance detection circuit and the second impedance detection circuit. According to the utility model, the technical problem that the accuracy of detecting the insulation resistance between the power battery and the vehicle body is low in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy vehicle field, specifically, relate to a kind of insulation impedance detection circuit and new energy vehicle. BACKGROUND

[0002] With the rapid development of new energy technology, more and more users purchase new energy vehicles as a means of daily life, even replace the oil-driven vehicle with new energy vehicles, with the growing number of new energy vehicle users, the safety of new energy vehicles is one of the important aspects considered by users. Power battery as the power of new energy vehicle, has higher voltage, so it is necessary to isolate the voltage between power battery and new energy vehicle body, so as to prevent the new energy vehicle from leaking after starting, to ensure the safety of users. Among them, detecting the insulation impedance between power battery and vehicle body is one of the necessary methods to prevent new energy vehicles from leaking after starting, and the accuracy of detecting the insulation impedance between power battery and vehicle body in the related art is low.

[0003] For the above problems, no effective solution has been proposed so far. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a kind of insulation impedance detection circuit and new energy vehicle, to at least solve the technical problem of low accuracy in related art for detecting the insulation impedance between power battery and vehicle body.

[0005] According to one aspect of the embodiment of the utility model, an insulation impedance detection circuit is provided, comprising: a first impedance detection circuit arranged on the low-voltage side of the new energy vehicle, a second impedance detection circuit arranged on the high-voltage side of the new energy vehicle, and a logic judgment module, the voltage level of the high-voltage side is higher than that of the low-voltage side;The first impedance detection circuit is connected with the first component arranged on the low-voltage side and the second component arranged on the high-voltage side respectively, for detecting the first insulation impedance between the first component and the second component;The second impedance detection circuit is connected with the first component and the second component respectively, for detecting the second insulation impedance between the first component and the second component;The logic judgment module is connected with the first impedance detection circuit and the second impedance detection circuit respectively, for determining whether the first component and the second component are successfully isolated based on the first insulation impedance and the second insulation impedance.

[0006] Further, the first impedance detection circuit includes: a first detection circuit, a first terminal of which is connected to a first component, a second terminal of which is connected to a second component, and the first detection circuit is used to detect a first voltage between the first component and the second component; a first isolation circuit, a first terminal of which is connected to a third terminal of the first detection circuit, and the first isolation circuit is used to acquire the first voltage; and a first processing unit, a first terminal of which is connected to a second terminal of the first isolation circuit, a second terminal of which is connected to a logic judgment module, and the first processing unit is used to determine a first insulation impedance based on the first voltage.

[0007] Furthermore, the first detection circuit includes: a first voltage divider resistor, the first end of which is connected to the first component, the second end of which is connected to the second component, and the third end of which is connected to the first end of the first isolation circuit.

[0008] Further, the first isolation circuit includes one of the following: a first operational amplifier, the first input terminal of the first operational amplifier being connected to the third terminal of the first detection circuit, the second input terminal of the first operational amplifier being grounded, and the output terminal of the first operational amplifier being connected to the first terminal of the first processing unit, the first operational amplifier being used to amplify the first voltage; and a first voltage follower, the first input terminal of the first voltage follower being connected to the third terminal of the first detection circuit, the second input terminal of the first voltage follower being grounded, and the output terminal of the first voltage follower being connected to the first terminal of the first processing unit, the first voltage follower being used to isolate the first voltage.

[0009] Further, the second impedance detection circuit includes: a second detection circuit, the first terminal of which is connected to the first component, and the second terminal of which is connected to the second component, the second detection circuit being used to detect a second voltage between the first component and the second component; a second isolation circuit, the first terminal of which is connected to the third terminal of the second detection circuit, the second isolation circuit being used to acquire the second voltage; and a second processing unit, the first terminal of which is connected to the second terminal of the second isolation circuit, the second terminal of which is connected to the logic judgment module, the second processing unit being used to determine the second insulation impedance based on the second voltage.

[0010] Furthermore, the second detection circuit includes: a second voltage divider resistor, the first end of which is connected to the first component, the second end of which is connected to the second component, and the third end of which is connected to the first end of the second isolation circuit.

[0011] Further, the second isolation circuit includes one of the following: a second operational amplifier, the first input terminal of which is connected to the third terminal of the second detection circuit, the second input terminal of which is grounded, and the output terminal of which is connected to the first terminal of the second processing unit, the second operational amplifier being used to amplify the second voltage; and a second voltage follower, the first input terminal of which is connected to the third terminal of the second detection circuit, the second input terminal of which is grounded, and the output terminal of which is connected to the first terminal of the second processing unit, the second voltage follower being used to isolate the second voltage.

[0012] Furthermore, the logic judgment module includes: a first logic judgment unit connected to the first impedance detection circuit, used to determine whether the first component and the second component are successfully isolated based on the first insulation impedance; and a second logic judgment unit connected to the second impedance detection circuit, used to determine whether the first component and the second component are successfully isolated based on the second insulation impedance.

[0013] Furthermore, the circuit also includes an isolation resistor assembly, the first end of which is connected to the second component, and the second end of which is connected to the first impedance detection circuit and the second impedance detection circuit. The isolation resistor assembly is used to provide voltage isolation between the first component and the second component.

[0014] Furthermore, the isolation resistor assembly includes: a first isolation resistor connected between the second component and the first impedance detection circuit; and a second isolation resistor connected between the second component and the second impedance detection circuit.

[0015] Furthermore, the circuit also includes an output module connected to the logic judgment module, used to output prompt information based on the control signal output by the logic judgment module.

[0016] Furthermore, the output module also includes one of the following: the instrument display screen of the new energy vehicle; the central control display screen of the new energy vehicle.

[0017] According to another aspect of the present invention, a new energy vehicle is also provided, comprising: a first component deployed on the low-voltage side; a second component deployed on the high-voltage side, wherein the voltage level of the low-voltage side is lower than the voltage level of the high-voltage side; and the aforementioned insulation impedance detection circuit, wherein the insulation impedance detection circuit is connected to the first component and the second component respectively, and the insulation impedance detection circuit is used to detect whether the first component and the second component are successfully isolated.

[0018] In this embodiment of the invention, an insulation impedance detection circuit is provided, comprising: a first impedance detection circuit disposed on the low-voltage side of the new energy vehicle, a second impedance detection circuit disposed on the high-voltage side of the new energy vehicle, and a logic judgment module; the first impedance detection circuit is connected to a first component deployed on the low-voltage side and a second component deployed on the high-voltage side; the second impedance detection circuit is connected to both the first and second components; and the logic judgment module is connected to both the first and second impedance detection circuits. In this invention, by separately configuring the first impedance detection circuit, the second impedance detection circuit, and the logic judgment module, the insulation impedance between the first and second components can be dually detected through the first and second detection modules to obtain the first and second insulation impedances respectively. The logic judgment module analyzes and judges the first and second insulation impedances to accurately determine whether the first and second components are successfully isolated. This avoids the phenomenon of missed or over-detection when detecting the insulation impedance between the power battery and the vehicle body, effectively improving the accuracy of detecting the insulation impedance between the power battery and the vehicle body, and thus solving the technical problem of low accuracy in detecting the insulation impedance between the power battery and the vehicle body in related technologies. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of an optional insulation resistance detection circuit according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of an optional first impedance detection circuit according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of an optional second impedance detection circuit according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of another optional insulation resistance detection circuit according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of another optional insulation resistance detection circuit according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of another optional insulation resistance detection circuit according to an embodiment of the present utility model;

[0026] The above figures include the following reference numerals: 10, low-voltage side; 11, high-voltage side; 12, first component; 13, second component; 14, first impedance detection circuit; 15, second impedance detection circuit; 16, logic judgment module; 20, first detection circuit; 21, first isolation circuit; 22, first processing unit; 30, second detection circuit; 31, second isolation circuit; 32, second processing unit; 40, vehicle body; 41, power battery; 42, first logic judgment unit; 43, second logic judgment unit; 44, first output unit; 45, second output unit; 50, first voltage divider resistor; 51, second voltage divider resistor; 52, first isolation resistor; 53, second isolation resistor; 54, first operational amplifier; 55, second operational amplifier; 56, output module; 60, first voltage follower; 61, second voltage follower. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device comprising a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0029] When the aforementioned preset application scenario is a scenario in a field other than the vehicle field, those skilled in the art should understand that the vehicle corresponding to the above insulation impedance detection circuit can be replaced with other objects (such as agricultural machinery, drones, robots, etc.), and correspondingly, the insulation impedance detection circuit of new energy vehicles can be replaced with insulation impedance detection circuits related to other objects. Based on this, this application embodiment takes the vehicle field as an example to illustrate the specific implementation of the above insulation impedance detection circuit.

[0030] According to an embodiment of the present invention, an embodiment of an insulation impedance detection circuit is provided. Figure 1 This is a schematic diagram of an optional insulation resistance detection circuit according to an embodiment of the present invention, as shown below. Figure 1 As shown, the circuit includes: a first impedance detection circuit 14 disposed on the low-voltage side 10 of the new energy vehicle, a second impedance detection circuit 15 disposed on the high-voltage side 11 of the new energy vehicle, and a logic judgment module 16, wherein the voltage level of the high-voltage side 11 is greater than the voltage level of the low-voltage side 10; the first impedance detection circuit 14 is connected to a first component 12 disposed on the low-voltage side 10 and a second component 13 disposed on the high-voltage side 11, respectively, and is used to detect the first insulation impedance between the first component 12 and the second component 13; the second impedance detection circuit 15 is connected to the first component 12 and the second component 13, respectively, and is used to detect the second insulation impedance between the first component 12 and the second component 13; the logic judgment module 16 is connected to the first impedance detection circuit 14 and the second impedance detection circuit 15, respectively, and is used to determine whether the first component 12 and the second component 13 are successfully isolated based on the first insulation impedance and the second insulation impedance.

[0031] The aforementioned new energy vehicles refer to vehicles that can be driven by electricity. These new energy vehicles are equipped with power batteries to provide electricity. These new energy vehicles include, but are not limited to: pure electric passenger cars, pure electric buses, pure electric trucks, pure electric lorries, plug-in hybrid electric passenger cars, plug-in hybrid electric buses, plug-in hybrid electric trucks, plug-in hybrid electric lorries, range-extended electric passenger cars, range-extended electric buses, range-extended electric trucks, or range-extended electric lorries. The aforementioned power batteries include, but are not limited to: lithium-ion batteries, solid-state batteries, or nickel-metal hydride batteries, etc., that provide power to the new energy vehicles.

[0032] The low-voltage side of the aforementioned new energy vehicle refers to the side of the new energy vehicle with a lower voltage. The low-voltage side of the aforementioned new energy vehicle refers to the side of the new energy vehicle body. Since the high-voltage side of the new energy vehicle usually contains components such as batteries, motors and inverters that operate at high voltage, generating voltages of hundreds of volts, new energy vehicles are divided into high-voltage and low-voltage sides to reduce the risk of electric shock to users. In this application, the aforementioned low-voltage side is the side of the new energy vehicle that does not contain high-voltage components.

[0033] The high-voltage side of the aforementioned new energy vehicle refers to the high-voltage side of the new energy vehicle with a higher voltage. The high-voltage side of the aforementioned new energy vehicle refers to one side of the power battery of the new energy vehicle. In this application, the high-voltage side is the side of the new energy vehicle that contains high-voltage components.

[0034] The aforementioned logic judgment module refers to the module in the insulation impedance detection circuit used to determine whether the first component and the second component are successfully isolated. The aforementioned logic judgment module analyzes the first insulation impedance and the second insulation impedance to double-determine whether the first component and the second component are successfully isolated. In this application, the first insulation impedance is determined by the first impedance detection circuit, and the second insulation impedance is determined by the second impedance detection circuit.

[0035] The aforementioned first component refers to the component on the low-voltage side of the new energy vehicle. In this application, the aforementioned first component refers to the component of the new energy vehicle body. The aforementioned first component includes, but is not limited to, the body frame, chassis frame, suspension system or steering system, etc. The aforementioned first component is collectively referred to as the body of the new energy vehicle.

[0036] The aforementioned second component refers to the component on the high-voltage side of the new energy vehicle. In this application, the aforementioned second component refers to the component in the new energy vehicle that operates in a high-voltage environment or generates high voltage. The aforementioned second component includes, but is not limited to, the motor, inverter, battery cell, positive and negative electrode materials, power battery casing or battery management system, etc. The aforementioned second component is collectively referred to as the power battery of the new energy vehicle.

[0037] The aforementioned first impedance detection circuit refers to a circuit used to detect the insulation impedance between the aforementioned first component and the aforementioned second component. The aforementioned first impedance detection circuit includes, but is not limited to, a bridge circuit, an insulation impedance matching circuit, an insulation impedance conversion circuit, or an insulation impedance measurement circuit.

[0038] The aforementioned second impedance detection circuit refers to a circuit used to detect the insulation impedance between the aforementioned first component and the aforementioned second component. The aforementioned second impedance detection circuit is independent of the aforementioned first impedance detection circuit, so as to realize dual detection of the insulation impedance between the power battery and the vehicle body of the new energy vehicle. The aforementioned second impedance detection circuit includes, but is not limited to: bridge circuit, insulation impedance matching circuit, insulation impedance conversion circuit or insulation impedance measurement circuit, etc.

[0039] In one optional embodiment, the insulation impedance detection circuit includes: a first impedance detection circuit, a second impedance detection circuit, and a logic judgment module. The first impedance detection circuit and the first component are disposed on the low-voltage side of the new energy vehicle where the voltage is lower. The second impedance detection circuit and the second component are disposed on the high-voltage side of the new energy vehicle where the voltage is higher. The first impedance detection circuit is connected to both the first component and the second component. The logic judgment module is connected to both the first impedance detection circuit and the second impedance detection circuit. The first impedance detection circuit detects a first insulation impedance between the first component and the second component, and the second impedance detection circuit detects a second insulation impedance between the first component and the second component. The first impedance detection circuit sends the first insulation impedance to the logic judgment module, and the second impedance detection circuit sends the second insulation impedance to the logic judgment module. The logic judgment module determines whether the first component and the second component are successfully isolated based on the first insulation impedance and the second insulation impedance.

[0040] In another optional embodiment, a first logic judgment module and a second logic judgment module can be provided. The insulation impedance detection circuit includes: a first impedance detection circuit, a second impedance detection circuit, a first logic judgment module, and a second logic judgment module. The first impedance detection circuit and the first component are disposed on the low-voltage side of the new energy vehicle where the voltage is lower. The second impedance detection circuit and the second component are disposed on the high-voltage side of the new energy vehicle where the voltage is higher. The first impedance detection circuit is connected to both the first component and the second component. The first logic judgment module is connected to the first impedance detection circuit, and the second logic judgment module is connected to the second impedance detection circuit. After detecting the first insulation impedance between the first component and the second component using the first impedance detection circuit, the first insulation impedance is sent to the first logic judgment module. The first logic judgment module determines whether the first component and the second component are successfully isolated, resulting in a first output. After detecting the second insulation impedance between the first component and the second component using the second impedance detection circuit, the second insulation impedance is sent to the second logic judgment module. The second logic judgment module determines whether the first component and the second component are successfully isolated, resulting in a second output. Based on the first output and the second output, it is determined whether the first component and the second component are successfully isolated.

[0041] The above solution provides an insulation impedance detection circuit, including: a first impedance detection circuit disposed on the low-voltage side of the new energy vehicle, a second impedance detection circuit disposed on the high-voltage side of the new energy vehicle, and a logic judgment module; the first impedance detection circuit is connected to a first component deployed on the low-voltage side and a second component deployed on the high-voltage side respectively; the second impedance detection circuit is connected to both the first and second components respectively; and the logic judgment module is connected to both the first and second impedance detection circuits respectively. In this invention, by separately setting the first impedance detection circuit, the second impedance detection circuit, and the logic judgment module, the insulation impedance between the first and second components can be dually detected through the first and second detection modules to obtain the first and second insulation impedances respectively. The logic judgment module analyzes and judges the first and second insulation impedances to accurately determine whether the first and second components are successfully isolated, thereby avoiding missed or over-detection when detecting the insulation impedance between the power battery and the vehicle body. This effectively improves the accuracy of detecting the insulation impedance between the power battery and the vehicle body, thus solving the technical problem of low accuracy in detecting the insulation impedance between the power battery and the vehicle body in related technologies.

[0042] Optionally, the first impedance detection circuit includes: a first detection circuit, a first terminal of which is connected to a first component, a second terminal of which is connected to a second component, and the first detection circuit is used to detect a first voltage between the first component and the second component; a first isolation circuit, a first terminal of which is connected to a third terminal of the first detection circuit, and the first isolation circuit is used to acquire the first voltage; and a first processing unit, a first terminal of which is connected to a second terminal of the first isolation circuit, a second terminal of which is connected to a logic judgment module, and the first processing unit is used to determine a first insulation impedance based on the first voltage.

[0043] The aforementioned first detection circuit refers to the circuit in the aforementioned first impedance detection circuit used to detect the voltage between the aforementioned first component and the aforementioned second component. In this application, the first voltage between the aforementioned first component and the aforementioned second component is determined by the aforementioned first detection circuit, thereby determining the first insulation impedance between the aforementioned first component and the aforementioned second component.

[0044] The aforementioned first isolation circuit refers to the circuit in the aforementioned first impedance detection circuit used to collect the detection results of the aforementioned first detection circuit. In this application, after the aforementioned first detection circuit detects the aforementioned first voltage, it collects the first voltage detected in the aforementioned first detection circuit through the aforementioned first isolation circuit, and then determines the first insulation impedance between the aforementioned first component and the aforementioned second component through the aforementioned first processing unit.

[0045] The aforementioned first processing unit refers to the circuit in the aforementioned first impedance detection circuit used to determine the aforementioned first insulation impedance based on the aforementioned first voltage. In this application, the aforementioned first insulation impedance can be obtained by calculating through a program preset in the aforementioned first processing unit, or the aforementioned first insulation impedance can be output by pre-establishing a first impedance determination model in the aforementioned first processing unit.

[0046] In one alternative embodiment, Figure 2 This is a schematic diagram of an optional first impedance detection circuit according to an embodiment of the present invention, as shown below. Figure 2 As shown, the first impedance detection circuit includes a first detection circuit 20, a first isolation circuit 21, and a first processing unit 22. The first end of the first detection circuit 20 is connected to the first component 12, the second end of the first detection circuit 20 is connected to the second component 13, the first end of the first isolation circuit 21 is connected to the third end of the first detection circuit 20, the first end of the first processing unit 22 is connected to the second end of the first isolation circuit 21, and the second end of the first processing unit 22 is connected to the logic judgment module 16. The first detection circuit 20 detects the first voltage between the first component 12 and the second component 13, acquires the first voltage through the first isolation circuit 21, and sends the first voltage to the first processing unit 22. The first processing unit 22 can calculate the first insulation impedance based on the first voltage according to a pre-set program.

[0047] In this application, by setting up a first detection circuit, a first isolation circuit, and a first processing unit, the voltage detection, voltage acquisition, and acquisition of the first insulation impedance between the first component and the second component can be performed independently, which effectively improves the stability of acquiring the first insulation impedance and enhances the user experience.

[0048] Optionally, the first detection circuit includes: a first voltage divider resistor, a first end of which is connected to a first component, a second end of which is connected to a second component, and a third end of which is connected to a first end of a first isolation circuit.

[0049] The aforementioned first voltage divider resistor is used to protect the isolation circuit. When the voltage in the first detection circuit is too high, the voltage is divided by the first voltage divider resistor to prevent short circuits or other faults from occurring in the first detection circuit. The aforementioned first voltage divider resistor is also used for voltage distribution and voltage measurement in the first detection circuit.

[0050] In one optional embodiment, a first voltage divider resistor is provided in the first detection circuit. The first end of the first voltage divider resistor is connected to the first component, the second end of the first voltage divider resistor is connected to the second component, and the third end of the first voltage divider resistor is connected to the first end of the first isolation circuit. The first voltage divider resistor is used to distribute and measure the voltage in the first detection circuit, and to protect the first detection circuit when the voltage in the first detection circuit is too high.

[0051] In another alternative embodiment, the first voltage divider unit can be replaced with a first voltage divider unit, wherein the first end of the first voltage divider unit is connected to the first component, the second end of the first voltage divider unit is connected to the second component, and the third end of the first voltage divider unit is connected to the first end of the first isolation circuit. The user can use the first voltage divider unit to distribute and measure the voltage in the first detection circuit, and to protect the first detection circuit.

[0052] In another optional embodiment, multiple first voltage-dividing resistors can be provided in the first detection circuit to form a first voltage-dividing resistor group. The first end of the first voltage-dividing resistor group is connected to the first component, the second end is connected to the second component, and the third end is connected to the first end of the first isolation circuit. The first voltage-dividing resistor group is used to distribute and measure the voltage in the first detection circuit, and to protect the first detection circuit when the voltage is too high.

[0053] In this application, by setting the first voltage divider resistor, the first voltage divider resistor is detected to determine the first voltage, which effectively improves the efficiency of obtaining the first voltage, effectively improves the safety of the first detection circuit, and enhances the user experience.

[0054] Optionally, the first isolation circuit includes one of the following: a first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to a third terminal of the first detection circuit, a second input terminal of the first operational amplifier is grounded, and an output terminal of the first operational amplifier is connected to a first terminal of the first processing unit, and the first operational amplifier is used to amplify the first voltage; and a first voltage follower, wherein a first input terminal of the first voltage follower is connected to a third terminal of the first detection circuit, a second input terminal of the first voltage follower is grounded, and an output terminal of the first voltage follower is connected to a first terminal of the first processing unit, and the first voltage follower is used to isolate the first voltage.

[0055] In one optional embodiment, the first isolation circuit includes: a first operational amplifier, a first input terminal of which is connected to a third terminal of the first detection circuit, a second input terminal of which is grounded, and an output terminal of which is connected to a first terminal of the first processing unit. After detecting a first voltage between the first component and the second component, the first detection circuit inputs the first voltage to the first operational amplifier, which amplifies the first voltage before inputting it to the first processing unit to improve the accuracy of the first processing unit in obtaining the first insulation impedance.

[0056] In another optional embodiment, the first isolation circuit includes: a first voltage follower, a first input terminal of which is connected to a third terminal of the first detection circuit, a second input terminal of which is grounded, and an output terminal of which is connected to a first terminal of the first processing unit. After detecting a first voltage between the first component and the second component, the first detection circuit inputs the first voltage to the first voltage follower, which isolates the first voltage to ensure its stability.

[0057] In this application, the first voltage is amplified by the first operational amplifier or isolated by the first voltage follower. The first operational amplifier effectively improves the accuracy of the insulation impedance detection circuit in detecting the insulation impedance, and the first voltage follower effectively improves the stability of the first voltage, thereby enhancing the user experience.

[0058] Optionally, the second impedance detection circuit includes: a second detection circuit, a first terminal of which is connected to the first component, a second terminal of which is connected to the second component, and the second detection circuit is used to detect a second voltage between the first component and the second component; a second isolation circuit, a first terminal of which is connected to the third terminal of the second detection circuit, and the second isolation circuit is used to acquire the second voltage; and a second processing unit, a first terminal of which is connected to the second terminal of the second isolation circuit, a second terminal of which is connected to the logic judgment module, and the second processing unit is used to determine the second insulation impedance based on the second voltage.

[0059] The aforementioned second detection circuit refers to the circuit in the aforementioned second impedance detection circuit used to perform a second detection of the voltage between the aforementioned first component and the aforementioned second component. In this application, the first voltage between the aforementioned first component and the aforementioned second component is determined by the aforementioned first detection circuit, and the second voltage between the aforementioned first component and the aforementioned second component is determined by the aforementioned second detection circuit, thereby determining the aforementioned second insulation impedance between the aforementioned first component and the aforementioned second component, so as to achieve the purpose of dual measurement of the voltage between the aforementioned first component and the aforementioned second component.

[0060] The aforementioned second isolation circuit refers to the circuit in the aforementioned first impedance detection circuit used to collect the detection results of the aforementioned second detection circuit. In this application, after the aforementioned second detection circuit detects the aforementioned first voltage, it collects the first voltage detected in the aforementioned second detection circuit through the aforementioned second isolation circuit, and then determines the first insulation impedance between the aforementioned first component and the aforementioned second component through the aforementioned second processing unit.

[0061] The aforementioned second processing unit refers to the circuit in the aforementioned first impedance detection circuit used to determine the aforementioned second insulation impedance based on the aforementioned first voltage. In this application, the aforementioned second insulation impedance can be obtained by calculating using a program pre-set in the aforementioned second processing unit, or the aforementioned second insulation impedance can be output by pre-establishing a first impedance determination model in the aforementioned second processing unit.

[0062] In one alternative embodiment, Figure 3 This is a schematic diagram of an optional second impedance detection circuit according to an embodiment of the present invention, as shown below. Figure 3 As shown, the second impedance detection circuit includes a second detection circuit 30, a second isolation circuit 31, and a second processing unit 32. The first end of the second detection circuit 30 is connected to the first component 12, and the second end of the second detection circuit 30 is connected to the second component 13. The first end of the second isolation circuit 31 is connected to the third end of the second detection circuit 30. The first end of the second processing unit 32 is connected to the second end of the second isolation circuit 31, and the second end of the second processing unit 32 is connected to the logic judgment module 16. The second detection circuit 30 detects the first voltage between the first component 12 and the second component 13, acquires the first voltage through the second isolation circuit 31, and sends the first voltage to the second processing unit 32. The second processing unit 32 can calculate the first insulation impedance based on the first voltage through a pre-set program.

[0063] In this application, by setting up a second detection circuit, a second isolation circuit, and a second processing unit, the voltage detection, voltage acquisition, and acquisition of the second insulation impedance between the first component and the second component can be performed independently, which effectively improves the stability of acquiring the second insulation impedance and enhances the user experience.

[0064] Optionally, the second detection circuit includes: a second voltage divider resistor, the first end of which is connected to the first component, the second end of which is connected to the second component, and the third end of which is connected to the first end of the second isolation circuit.

[0065] The aforementioned second voltage divider resistor is used to protect the isolation circuit. When the voltage in the second detection circuit is too high, the voltage is divided by the second voltage divider resistor to prevent short circuits or other faults from occurring in the second detection circuit. The aforementioned second voltage divider resistor is also used for voltage distribution and voltage measurement in the second detection circuit.

[0066] In one optional embodiment, a second voltage divider resistor is provided in the second detection circuit. The first end of the second voltage divider resistor is connected to the first component, the second end is connected to the second component, and the third end is connected to the first end of the second isolation circuit. The second voltage divider resistor is used to distribute and measure the voltage in the second detection circuit, and to protect the second detection circuit when the voltage is too high.

[0067] In another alternative embodiment, the second voltage divider unit can be replaced with a second voltage divider unit, wherein the first end of the second voltage divider unit is connected to the first component, the second end of the second voltage divider unit is connected to the second component, and the third end of the second voltage divider unit is connected to the first end of the first isolation circuit. The user can use the second voltage divider unit to distribute and measure the voltage in the second detection circuit.

[0068] In another optional embodiment, multiple second voltage-dividing resistors can be provided in the second detection circuit to form a second voltage-dividing resistor group. The first end of the second voltage-dividing resistor group is connected to the first component, the second end of the second voltage-dividing resistor group is connected to the second component, and the third end of the second voltage-dividing resistor group is connected to the first end of the first isolation circuit. The second voltage-dividing resistor group is used to distribute and measure the voltage in the second detection circuit, and to protect the second detection circuit when the voltage is too high.

[0069] In this application, by setting the second voltage divider resistor, the second voltage is detected to determine the second voltage, which effectively improves the efficiency of obtaining the second voltage, effectively improves the safety of the second detection circuit, and enhances the user experience.

[0070] Optionally, the second isolation circuit includes one of the following: a second operational amplifier, wherein the first input terminal of the second operational amplifier is connected to the third terminal of the second detection circuit, the second input terminal of the second operational amplifier is grounded, and the output terminal of the second operational amplifier is connected to the first terminal of the second processing unit, and the second operational amplifier is used to amplify the second voltage; and a second voltage follower, wherein the first input terminal of the second voltage follower is connected to the third terminal of the second detection circuit, the second input terminal of the second voltage follower is grounded, and the output terminal of the second voltage follower is connected to the first terminal of the second processing unit, and the second voltage follower is used to isolate the second voltage.

[0071] In one optional embodiment, the second isolation circuit includes a second operational amplifier. The first input terminal of the second operational amplifier is connected to the third terminal of the first detection circuit, the second input terminal of the second operational amplifier is grounded, and the output terminal of the second operational amplifier is connected to the first terminal of the first processing unit. After the first detection circuit detects the second voltage between the first component and the second component, it inputs the second voltage to the second operational amplifier, which amplifies the second voltage before inputting it to the first processing unit to improve the accuracy of the second processing unit in obtaining the second insulation impedance.

[0072] In another optional embodiment, the second isolation circuit includes a second voltage follower. The first input terminal of the second voltage follower is connected to the third terminal of the first detection circuit, the second input terminal of the second voltage follower is grounded, and the output terminal of the second voltage follower is connected to the first terminal of the first processing unit. After detecting the second voltage between the first component and the second component, the first detection circuit inputs the second voltage to the second voltage follower, which isolates the second voltage to ensure its stability.

[0073] In this application, the second voltage is amplified by the second operational amplifier or isolated by the second voltage follower. The second operational amplifier effectively improves the accuracy of the insulation impedance detection circuit in obtaining the second insulation impedance, and the second voltage follower effectively improves the stability of the second voltage, thereby enhancing the user experience.

[0074] Optionally, the logic judgment module includes: a first logic judgment unit connected to the first impedance detection circuit, used to determine whether the first component and the second component are successfully isolated based on the first insulation impedance; and a second logic judgment unit connected to the second impedance detection circuit, used to determine whether the first component and the second component are successfully isolated based on the second insulation impedance.

[0075] The aforementioned first logic judgment module refers to the module in the aforementioned logic judgment module used to determine whether the aforementioned first component and the aforementioned second component are successfully isolated based on the first insulation impedance. In this application, the aforementioned first logic judgment module is used to analyze the aforementioned first insulation impedance in order to determine whether the aforementioned first component and the aforementioned second component are successfully isolated.

[0076] The aforementioned second logic judgment module refers to the module in the aforementioned logic judgment module used to determine whether the aforementioned first component and the aforementioned second component are successfully isolated based on the second insulation impedance. In this application, the aforementioned second logic judgment module is used to analyze the aforementioned second insulation impedance in order to determine whether the aforementioned first component and the aforementioned second component are successfully isolated.

[0077] In one optional embodiment, the logic judgment module includes: a first logic judgment unit and a second logic judgment unit. The first logic judgment unit is connected to a first impedance detection circuit, and the second logic judgment unit is connected to a second impedance detection circuit. In this application, the first logic judgment unit analyzes the first insulation impedance to determine whether the first component and the second component are successfully isolated; the second logic judgment unit analyzes the second insulation impedance to determine whether the first component and the second component are successfully isolated. The first logic judgment unit and the second logic judgment unit perform dual detection to accurately determine whether the first component and the second component are successfully isolated.

[0078] In this application, by setting up a first logic judgment unit and a second logic judgment unit respectively, the first logic judgment unit and the second logic judgment unit are used to double-detect whether the first component and the second component are successfully isolated. This effectively improves the accuracy of determining whether the first component and the second component are successfully isolated, thereby improving the user experience.

[0079] Optionally, the circuit further includes: an isolation resistor assembly, a first end of which is connected to the second component, and a second end of which is connected to the first impedance detection circuit and the second impedance detection circuit. The isolation resistor assembly is used to provide voltage isolation between the first component and the second component.

[0080] The aforementioned isolation components refer to components used for voltage isolation between the first component and the second component. These isolation components include, but are not limited to, isolation resistors, optocouplers, transformers, isolated DC-DC converters, isolated relays, or isolated gate drivers. In this application, the voltage isolation between the first component and the second component is achieved through the aforementioned isolation components.

[0081] In an optional embodiment, the insulation impedance detection circuit is further provided with an isolation resistor component. The first end of the isolation resistor component is connected to the second component, and the second end of the isolation resistor component is connected to the first impedance detection circuit and the second impedance detection circuit. The isolation resistor component can provide voltage isolation between the first component and the second component.

[0082] In this application, the voltage isolation of the first component and the second component is achieved through the aforementioned isolation component, so as to prevent the voltage of the power battery of the new energy vehicle and the voltage of the vehicle body from interfering with each other, effectively improving the safety of the new energy vehicle and enhancing the user experience.

[0083] Optionally, the isolation resistor assembly includes: a first isolation resistor connected between the second component and the first impedance detection circuit; and a second isolation resistor connected between the second component and the second impedance detection circuit.

[0084] In one optional embodiment, the isolation resistor assembly includes: a first isolation resistor and a second isolation resistor, wherein the first isolation resistor is disposed between the second component and the first impedance detection circuit, and the second isolation resistor is disposed between the second component and the second impedance detection circuit to prevent the high voltage in the second component from affecting the first component.

[0085] In this application, by setting a first isolation resistor and a second isolation resistor, the high voltage in the second component is prevented from affecting the first component, which effectively improves the safety of the vehicle body, thereby effectively improving the safety of new energy vehicles and enhancing the user experience.

[0086] Optionally, the circuit further includes an output module connected to the logic judgment module, used to output prompt information based on the control signal output by the logic judgment module.

[0087] The aforementioned prompt information refers to information used to inform the user whether the first component and the second component have been successfully isolated. The user can determine whether the first component and the second component have been successfully isolated based on the aforementioned prompt information. The aforementioned prompt information includes, but is not limited to, sound information, image information, or video information.

[0088] The aforementioned output module refers to the module that outputs prompt information to the user terminal based on the judgment result of the logic judgment module. In this application, after the logic judgment module determines whether the first component and the second component are successfully isolated, it sends the judgment result to the aforementioned output module. The aforementioned output module then prompts the user with the aforementioned prompt information. The aforementioned output module includes, but is not limited to, a display output module, an audio output module, or a video output module.

[0089] In an optional embodiment, the insulation impedance detection circuit includes an output module connected to the logic judgment module. After the logic judgment module determines whether the first component and the second component are successfully isolated, it sends the judgment result to the output module. The output module outputs a prompt message to remind the user whether the first component and the second component are successfully isolated.

[0090] In this application, by setting an output module, the user is reminded whether the first component and the second component have been successfully isolated, so that the user can repair the new energy vehicle in a timely manner if the isolation fails, which effectively improves the safety of the new energy vehicle and thus enhances the user experience.

[0091] Optionally, the output module may also include one of the following: an instrument display screen for new energy vehicles; or a central control display screen for new energy vehicles.

[0092] In one optional embodiment, the output module includes an instrument display screen or a central control display screen of the new energy vehicle. After the logic judgment module determines whether the first component and the second component are successfully isolated, it sends the judgment result to the output module. The output module outputs information on whether the first component and the second component are successfully isolated to the instrument display screen or the central control display screen of the new energy vehicle to remind the user whether the first component and the second component are successfully isolated.

[0093] In this application, the instrument display screen and the central control display screen are used to quickly remind the user whether the first component and the second component are successfully isolated, which effectively improves the efficiency of the insulation resistance detection circuit in prompting the user and enhances the user experience.

[0094] For example, Figure 4 This is a schematic diagram of another optional insulation resistance detection circuit according to an embodiment of the present invention, as shown below. Figure 4As shown, the insulation resistance detection circuit includes: a first component 12, a first detection circuit 20, a first isolation circuit 21, a first processing unit 22, a first logic judgment unit 42, a second component 13, a second detection circuit 30, a second isolation circuit 31, a second processing unit 32, a second logic judgment unit 43, and an equivalent insulation resistance 46. The first component 12, the first detection circuit 20, the first isolation circuit 21, the first processing unit 22, and the first logic judgment unit 42 are disposed on the vehicle body 40, while the second component 13, the second detection circuit 30, the second isolation circuit 31, the second processing unit 32, and the second logic judgment unit 43 are disposed on the power battery 41. An equivalent insulation resistance 46 is provided between the vehicle body 40 and the power battery 41. The vehicle body 40 is isolated from the power battery 41 by an equivalent insulation impedance 46. The first voltage and the second voltage between the first component 12 and the second component 13 are obtained by the first detection circuit 20 and the second detection circuit 30, respectively. The first detection circuit 20 sends the first voltage to the first isolation circuit 21, and the second detection circuit 30 sends the second voltage to the second isolation circuit 31. The first isolation circuit 21 collects the first voltage and sends it to the first processing unit 22. The second isolation circuit 31 collects the second voltage and sends it to the second processing unit 32. The first processing unit 22 analyzes the first voltage to obtain the first insulation impedance, and the second processing unit 32 analyzes the second voltage to obtain the second insulation impedance. The first processing unit 22 determines whether the first component 12 and the second component 13 are successfully isolated, and the second processing unit 32 determines whether the first component 12 and the second component 13 are successfully isolated. The first output unit 44 and the second output unit 45 in the output module notify the user whether the first component 12 and the second component 13 are successfully isolated.

[0095] Furthermore, Figure 5 This is a schematic diagram of another optional insulation resistance detection circuit according to an embodiment of the present invention, as shown below. Figure 5As shown, the insulation impedance detection circuit includes: a first component 12, a second component 13, a first isolation resistor 52, a second isolation resistor 53, a first voltage divider resistor 50, a second voltage divider resistor 51, a first operational amplifier 54, a second operational amplifier 55, an output module 56, a first processing unit 22, a second processing unit 32, a first logic judgment unit 42, a second logic judgment unit 43, and an equivalent insulation impedance 46. The second component 13 is mounted on the power battery 41, and the first component 12 is mounted on the vehicle body 40. An equivalent insulation impedance 46 for isolating the power battery 41 and the vehicle body 40 is provided between them. The first component 12 is connected to the first voltage divider resistor 50 and the second voltage divider resistor 51, and the second component is connected to the first isolation resistor 52 and the second isolation resistor 53. The first voltage divider resistor 50 divides the first voltage, the second voltage divider resistor 51 divides the second voltage, and the first isolation resistor 52 and the second isolation resistor 53 isolate the first component 12 and the second component 13. The first voltage divider resistor 50 transmits the first voltage to the first operational amplifier 54. After amplification, the first voltage is processed by the first processing unit 22 to obtain the first insulation impedance. The first logic judgment unit 42 determines whether the first component 12 and the second component 13 are successfully isolated. The second voltage divider resistor 51 transmits the second voltage to the second operational amplifier 55. After amplification, the second voltage is processed by the second processing unit 32 to obtain the second insulation impedance. The second logic judgment unit 43 determines whether the first component 12 and the second component 13 are successfully isolated. The output module 56 notifies the user whether the first component 12 and the second component 13 are successfully isolated.

[0096] Furthermore, Figure 6 This is a schematic diagram of another optional insulation resistance detection circuit according to an embodiment of the present invention, as shown below. Figure 6As shown, the insulation impedance detection circuit includes: a first component 12, a second component 13, a first isolation resistor 52, a second isolation resistor 53, a first voltage divider resistor 50, a second voltage divider resistor 51, a first voltage follower 60, a second voltage follower 61, an output module 56, a first processing unit 22, a second processing unit 32, a first logic judgment unit 42, a second logic judgment unit 43, and an equivalent insulation impedance 46. The second component 13 is mounted on the power battery 41, and the first component 12 is mounted on the vehicle body 40. An equivalent insulation impedance 46 for isolating the power battery 41 and the vehicle body 40 is provided between them. The first component 12 is connected to the first voltage divider resistor 50 and the second voltage divider resistor 51, and the second component is connected to the first isolation resistor 52 and the second isolation resistor 53. The first voltage is divided by the first voltage divider resistor 50, and the second voltage is divided by the second voltage divider resistor 51. The first component 12 and the second component 13 are isolated by the first isolation resistor 52 and the second isolation resistor 53. The first voltage divider resistor 50 transmits the first voltage to the first voltage follower 60, which isolates the first voltage. The first processing unit 22 then processes the isolated first voltage to obtain the first insulation impedance. The first logic judgment unit 42 determines whether the first component 12 and the second component 13 are successfully isolated. The second voltage divider resistor 51 transmits the second voltage to the second voltage follower 61, which isolates the second voltage. The second processing unit 32 then processes the second voltage to obtain the second insulation impedance. The second logic judgment unit 43 determines whether the first component 12 and the second component 13 are successfully isolated. The output module 56 then notifies the user whether the first component 12 and the second component 13 are successfully isolated.

[0097] According to another aspect of the present invention, a new energy vehicle is also provided. The vehicle is equipped with the insulation impedance circuit of the above embodiment. The first component of the new energy vehicle is disposed on the low-voltage side, and the second component of the new energy vehicle is disposed on the high-voltage side. The voltage level of the low-voltage side is lower than the voltage level of the high-voltage side. The insulation impedance circuit is connected to the first component and the second component respectively to detect whether the first component and the second component are successfully isolated. The specific implementation method and preferred application scenario are the same as those in the above embodiment, and will not be repeated here.

[0098] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An insulation resistance detection circuit, characterized in that, include: The system includes a first impedance detection circuit installed on the low-voltage side of the new energy vehicle, a second impedance detection circuit installed on the high-voltage side of the new energy vehicle, and a logic judgment module, wherein the voltage level of the high-voltage side is greater than the voltage level of the low-voltage side. The first impedance detection circuit is connected to a first component deployed on the low-voltage side and a second component deployed on the high-voltage side, respectively, and is used to detect the first insulation impedance between the first component and the second component; The second impedance detection circuit is connected to the first component and the second component respectively, and is used to detect the second insulation impedance between the first component and the second component; The logic judgment module is connected to the first impedance detection circuit and the second impedance detection circuit respectively, and is used to determine whether the first component and the second component are successfully isolated based on the first insulation impedance and the second insulation impedance.

2. The insulation resistance detection circuit according to claim 1, characterized in that, The first impedance detection circuit includes: A first detection circuit, wherein a first terminal of the first detection circuit is connected to the first component, and a second terminal of the first detection circuit is connected to the second component, and the first detection circuit is used to detect a first voltage between the first component and the second component; A first isolation circuit, wherein a first terminal of the first isolation circuit is connected to a third terminal of the first detection circuit, and the first isolation circuit is used to acquire the first voltage; A first processing unit, wherein a first end of the first processing unit is connected to a second end of the first isolation circuit, and a second end of the first processing unit is connected to the logic judgment module, and the first processing unit is used to determine the first insulation impedance based on the first voltage.

3. The insulation resistance detection circuit according to claim 2, characterized in that, The first detection circuit includes: The first voltage divider resistor has its first end connected to the first component, its second end connected to the second component, and its third end connected to the first end of the first isolation circuit.

4. The insulation resistance detection circuit according to claim 2, characterized in that, The first isolation circuit includes one of the following: A first operational amplifier has a first input terminal connected to a third terminal of the first detection circuit, a second input terminal grounded, and an output terminal connected to a first terminal of the first processing unit. The first operational amplifier is used to amplify the first voltage. A first voltage follower has its first input terminal connected to the third terminal of the first detection circuit, its second input terminal grounded, and its output terminal connected to the first terminal of the first processing unit. The first voltage follower is used to isolate the first voltage.

5. The insulation resistance detection circuit according to claim 1, characterized in that, The second impedance detection circuit includes: A second detection circuit is provided, wherein a first terminal of the second detection circuit is connected to the first component, and a second terminal of the second detection circuit is connected to the second component, and the second detection circuit is used to detect a second voltage between the first component and the second component. A second isolation circuit is used to acquire the second voltage. The first terminal of the second isolation circuit is connected to the third terminal of the second detection circuit. The second processing unit has a first end connected to the second end of the second isolation circuit and a second end connected to the logic judgment module. The second processing unit is used to determine the second insulation impedance based on the second voltage.

6. The insulation resistance detection circuit according to claim 5, characterized in that, The second detection circuit includes: The second voltage divider resistor has its first end connected to the first component, its second end connected to the second component, and its third end connected to the first end of the second isolation circuit.

7. The insulation resistance detection circuit according to claim 5, characterized in that, The second isolation circuit includes one of the following: The second operational amplifier has its first input terminal connected to the third terminal of the second detection circuit, its second input terminal grounded, and its output terminal connected to the first terminal of the second processing unit. The second operational amplifier is used to amplify the second voltage. The second voltage follower has its first input terminal connected to the third terminal of the second detection circuit, its second input terminal grounded, and its output terminal connected to the first terminal of the second processing unit. The second voltage follower is used to isolate the second voltage.

8. The insulation resistance detection circuit according to any one of claims 1 to 7, characterized in that, The logic judgment module includes: The first logic judgment unit is connected to the first impedance detection circuit and is used to determine whether the first component and the second component are successfully isolated based on the first insulation impedance. The second logic judgment unit is connected to the second impedance detection circuit and is used to determine whether the first component and the second component are successfully isolated based on the second insulation impedance.

9. The insulation resistance detection circuit according to any one of claims 1 to 7, characterized in that, Also includes: An isolation resistor assembly is provided, wherein a first end of the isolation resistor assembly is connected to the second component, and a second end of the isolation resistor assembly is connected to the first impedance detection circuit and the second impedance detection circuit. The isolation resistor assembly is used to provide voltage isolation between the first component and the second component.

10. The insulation resistance detection circuit according to claim 9, characterized in that, The isolation resistor assembly includes: A first isolation resistor is connected between the second component and the first impedance detection circuit; The second isolation resistor is connected between the second component and the second impedance detection circuit.

11. The insulation resistance detection circuit according to any one of claims 1 to 7, characterized in that, Also includes: The output module, connected to the logic judgment module, is used to output prompt information based on the control signal output by the logic judgment module.

12. The insulation resistance detection circuit according to claim 11, characterized in that, The output module also includes one of the following: The instrument display screen of the new energy vehicle; The central control display screen of the new energy vehicle.

13. A new energy vehicle, characterized in that, include: The insulation impedance detection circuit according to any one of claims 1 to 12, wherein the insulation impedance detection circuit is connected to the first component and the second component respectively, and the insulation impedance detection circuit is used to detect whether the first component and the second component are successfully isolated.

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