Insulation detection system, equipment and vehicle

Abstract

The utility model discloses an insulation detection system, equipment and a vehicle. The insulation detection system comprises a voltage acquisition unit, a voltage preprocessing unit and a micro-control unit, the voltage acquisition unit is used for acquiring the voltage of the whole vehicle; the voltage preprocessing unit is electrically connected with the voltage acquisition unit and is used for preprocessing the acquired voltage of the whole vehicle and outputting a digital voltage signal corresponding to the voltage of the whole vehicle; and the micro-control unit is electrically connected with the voltage preprocessing unit and is used for calculating the insulation value of the whole vehicle based on the digital voltage signal and a preset compensation method. According to the utility model, low-cost components are adopted, so that the insulation detection system can meet the requirements of high precision and low cost at the same time.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to an insulation detection system, equipment and vehicle. Background Art

[0002] With the development of society, new energy vehicles and commercial vehicles are becoming more and more popular. New energy vehicles generally lead out two high-voltage busbars, namely the positive busbar and the negative busbar, from the power battery to connect the power battery of new energy vehicles with the motor controller of the vehicle. The high voltage range is between 300v-1000v. This high voltage level is enough to endanger personal safety, and the risk of electric shock must be avoided. The insulation of the power battery and the battery shell that provide power for new energy vehicles is one of the most important aspects to avoid the risk of electric shock. It is very important and urgent to carry out relevant research on high-voltage insulation detection.

[0003] At present, in order to meet the detection accuracy requirements of the national standard (GBT38661), automotive insulation detection circuits use a large number of high-precision resistors (such as an accuracy of 0.1%), or high-bit ADCs, reference sources and other circuits, resulting in high costs for insulation detection circuits.

[0004] However, the above insulation detection circuit cannot meet the requirements of high precision and low cost at the same time. Utility Model Content

[0005] The main purpose of the present application is to provide an insulation detection system, equipment and vehicle to solve the problem that the existing insulation detection system cannot meet the requirements of high precision and low cost at the same time.

[0006] In order to achieve the above objectives, in a first aspect, the present application provides an insulation detection system, comprising:

[0007] Voltage acquisition unit, voltage preprocessing unit and micro control unit;

[0008] Voltage collection unit, used to collect the voltage of the entire vehicle;

[0009] A voltage preprocessing unit is electrically connected to the voltage acquisition unit and is used to preprocess the acquired vehicle voltage and output a digital voltage signal corresponding to the vehicle voltage;

[0010] The micro control unit is electrically connected to the voltage preprocessing unit and is used to calculate the insulation value of the entire vehicle based on the digital voltage signal and a preset compensation method.

[0011] In a possible implementation, the voltage preprocessing unit includes:

[0012] Voltage dividing resistors, voltage acquisition and conditioning circuits, and analog-to-digital converters;

[0013] A voltage-dividing resistor is electrically connected to the voltage acquisition unit and is used to divide the collected vehicle voltage into a low-amplitude analog voltage signal that meets the input range of the analog-to-digital converter;

[0014] The voltage acquisition and conditioning circuit is electrically connected to the voltage dividing resistor and is used to perform impedance matching on the low-amplitude analog voltage signal and output an analog voltage signal recognizable by the analog-to-digital converter;

[0015] The analog-to-digital converter is electrically connected to the voltage acquisition and conditioning circuit and is used for converting the analog voltage signal recognizable by the analog-to-digital converter into a digital voltage signal.

[0016] In a possible implementation, the voltage acquisition and conditioning circuit includes:

[0017] A first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, an operational amplifier, a first power supply, and a second power supply;

[0018] One end of the sixth resistor is electrically connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the positive electrode of the second power supply, the other end of the fourth resistor is electrically connected to the non-inverting input terminal of the amplifier, the inverting input terminal of the operational amplifier is electrically connected to one end of the third resistor, the other end of the third resistor is grounded, one end of the third resistor is also electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the output terminal of the operational amplifier and one end of the first resistor, the other end of the first resistor is electrically connected to one end of the first capacitor, the other end of the first capacitor is grounded, the power input terminal of the operational amplifier is electrically connected to the positive electrode of the first power supply and one end of the second capacitor, the other end of the second capacitor is grounded, and the power output terminal of the operational amplifier is grounded.

[0019] In a possible implementation, the preset compensation method includes at least a single linear compensation method and a multi-segment linear compensation method.

[0020] In a possible implementation, the preset compensation method is a single linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal;

[0021] Micro control unit, comprising:

[0022] A first calculation unit, a second calculation unit, and an insulation value calculation unit;

[0023] A first calculation unit, electrically connected to the voltage preprocessing unit, for calculating a linear parameter using a single linear compensation method and the first digital voltage signal, and determining a linear function based on the linear parameter;

[0024] A second calculation unit, electrically connected to the first calculation unit, and configured to input the second digital voltage signal into a linear function and output a compensation value;

[0025] The insulation value calculation unit is electrically connected to the second calculation unit and is used to calculate the insulation value using the compensation value.

[0026] In a possible implementation, the preset compensation method is a multi-segment linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal;

[0027] Micro control unit, comprising:

[0028] A first calculation unit, a second calculation unit, and an insulation value calculation unit;

[0029] A first calculation unit is electrically connected to the voltage preprocessing unit, and is used to calculate multiple sets of linear parameters using a multi-segment linear compensation method and the first digital voltage signal, and determine multiple linear functions based on the multiple sets of linear parameters, wherein the multiple sets of linear parameters correspond to the multiple linear functions one by one;

[0030] A second calculation unit, electrically connected to the first calculation unit, configured to input the second digital voltage signal into a target linear function among the plurality of linear functions, and output a compensation value, wherein the target linear function is a linear function corresponding to the voltage interval to which the second digital voltage signal belongs;

[0031] The insulation value calculation unit is electrically connected to the second calculation unit and is used to calculate the insulation value using the compensation value.

[0032] In a possible implementation, the insulation detection circuit further includes:

[0033] Reference source;

[0034] The reference source is electrically connected to the voltage preprocessing unit and is used to provide power to the voltage preprocessing unit.

[0035] In a second aspect, an embodiment of the utility model provides an insulation detection device, and the insulation detection device at least includes any insulation detection system as described above.

[0036] In a third aspect, an embodiment of the utility model provides a vehicle, the vehicle comprising at least any insulation detection system as described above.

[0037] The embodiment of the utility model provides an insulation detection system, equipment and vehicle, including: a voltage acquisition unit, a voltage preprocessing unit and a micro control unit; the voltage acquisition unit is used to collect the voltage of the whole vehicle; the voltage preprocessing unit is electrically connected to the voltage acquisition unit, and is used to preprocess the collected whole vehicle voltage and output a digital voltage signal corresponding to the whole vehicle voltage; the micro control unit is electrically connected to the voltage preprocessing unit, and is used to calculate the insulation value of the whole vehicle based on the digital voltage signal and a preset compensation method. The utility model adopts low-cost components, so that the insulation detection system can meet the requirements of high precision and low cost at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0039] Figure 1 It is a schematic diagram of an insulation detection circuit provided by an embodiment of the utility model;

[0040] Figure 2 It is a schematic diagram of a voltage preprocessing unit and a microcontroller unit provided in an embodiment of the utility model;

[0041] Figure 3 It is a schematic diagram of a voltage acquisition and conditioning circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0044] It should be understood that in various embodiments of the present invention, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0045] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0046] It should be understood that in the present utility model, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains A, B and C", "Contains A, B, C" means that A, B, and C are all included, "Contains A, B or C" means that one of A, B, and C is included, and "Contains A, B and / or C" means that any one, any two, or any three of A, B, and C are included.

[0047] It should be understood that in the present invention, "B corresponding to A", "B corresponding to A", "A corresponds to B" or "B corresponds to A" means that B is associated with A and B can be determined based on A. Determining B based on A does not mean determining B based only on A, but B can also be determined based on A and / or other information. A and B match when the similarity between A and B is greater than or equal to a preset threshold.

[0048] Depending on the context, "if" as used herein may be interpreted as "when" or "when" or "in response to determining" or "in response to detecting."

[0049] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0050] In order to make the purpose, technical solutions and advantages of the utility model clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0051] In one embodiment, Figure 1 As shown, an insulation detection system is provided, comprising the following steps:

[0052] Voltage acquisition unit, voltage preprocessing unit and micro control unit.

[0053] Among them, the voltage acquisition unit is used to collect the voltage of the whole vehicle; the voltage preprocessing unit is electrically connected to the voltage acquisition unit, used to preprocess the collected whole vehicle voltage and output a digital voltage signal corresponding to the whole vehicle voltage; the micro control unit is electrically connected to the voltage preprocessing unit, used to calculate the insulation value of the whole vehicle based on the digital voltage signal and a preset compensation method.

[0054] The insulation detection system also includes: a reference source; the reference source is electrically connected to the voltage preprocessing unit and is used to provide power to the voltage preprocessing unit.

[0055] like Figure 2As shown, the voltage preprocessing unit includes: a voltage dividing resistor, a voltage acquisition and conditioning circuit, and an analog-to-digital converter.

[0056] Among them, the voltage-dividing resistor is electrically connected to the voltage acquisition unit, and is used to divide the collected vehicle voltage into a low-amplitude analog voltage signal that meets the input range of the analog-to-digital converter; the voltage acquisition and conditioning circuit is electrically connected to the voltage-dividing resistor, and is used to perform impedance matching on the low-amplitude analog voltage signal and output an analog voltage signal recognizable by the analog-to-digital converter; the analog-to-digital converter is electrically connected to the voltage acquisition and conditioning circuit, and is used to convert the analog voltage signal recognizable by the analog-to-digital converter into a digital voltage signal.

[0057] like Figure 3 As shown, the voltage acquisition and conditioning circuit includes:

[0058] A first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, an operational amplifier IC1, a first power supply and a second power supply VREF;

[0059] One end of the sixth resistor R6 is electrically connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is electrically connected to the positive electrode of the second power supply VREF, the other end of the fourth resistor R4 is electrically connected to the non-inverting input terminal of the operational amplifier IC1, the inverting input terminal of the operational amplifier IC1 is electrically connected to one end of the third resistor R3, the other end of the third resistor R3 is grounded, one end of the third resistor R3 is also electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the output terminal of the operational amplifier IC1 and one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, the power input terminal of the operational amplifier IC1 is electrically connected to the positive electrode VDD of the first power supply and one end of the second capacitor C2, the other end of the second capacitor C2 is grounded, and the power output terminal of the operational amplifier IC1 is grounded.

[0060] Since the voltage divider resistor (i.e., the voltage divider circuit), the voltage acquisition and conditioning circuit and the analog-to-digital converter (i.e., the digital-to-analog converter) are connected in sequence, specifically, one end of the sixth resistor R6 in the voltage acquisition and conditioning circuit is electrically connected to the voltage divider resistor, and the other end of the first resistor R1 is electrically connected to the analog-to-digital converter to form a final connection relationship.

[0061] The micro control unit includes: a first calculation unit, a second calculation unit, and an insulation value calculation unit.

[0062] Among them, the preset compensation method at least includes a single linear compensation method and a multi-segment linear compensation method.

[0063] When the preset compensation method is a single linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal, the first calculation unit is electrically connected to the power preprocessing unit, and is used to calculate the linear parameters using the single linear compensation method and the first digital voltage signal, and determine the linear function based on the linear parameters; the second calculation unit is electrically connected to the first calculation unit, and is used to input the second digital voltage signal into the linear function and output the compensation value; the insulation value calculation unit is electrically connected to the second calculation unit, and is used to calculate the insulation value using the compensation value. The first digital voltage signal is a data group composed of a digital voltage signal in a certain digital voltage signal interval and an actually collected digital voltage signal, and the linear parameters are calculated for the selected linear function to obtain the required data group, thereby obtaining the linear function.

[0064] For example, the first digital voltage signal includes two sets of data, namely 3v and 3.5v, and 4v and 4.5v, where 3v and 4v are the values ​​of a certain digital voltage signal interval, and 3.5v and 4.5v are the actual collected digital voltage signals. Input these two sets of data into the linear function: y=kx+b, and the values ​​of linear parameters k and b can be calculated. Specifically,

[0065] By formula: 3k+b=3.5, 4k+b=4.5

[0066] The solution is k=1, b=0.5.

[0067] After calculating the linear parameters, the linear function y=x+0.5 can be directly determined.

[0068] The acquired second digital voltage signal is then input into a linear function to output a compensation value, wherein the second digital voltage signal represents the actually collected digital voltage signal, for example, the second digital voltage signal is 2v, and the second digital voltage signal of 2v is substituted as input into the determined linear function y=x+0.5, and the calculated y value, i.e. 2.5v, is the compensation value, and finally the insulation value is calculated based on the calculated compensation value.

[0069] In the case where the preset compensation method is a multi-segment linear compensation method and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal, the microcontroller unit includes: a first calculation unit, a second calculation unit, and an insulation value calculation unit; the first calculation unit is electrically connected to the voltage preprocessing unit, and is used to calculate multiple sets of linear parameters using the multi-segment linear compensation method and the first digital voltage signal, and determine multiple linear functions based on the multiple sets of linear parameters, wherein the multiple sets of linear parameters correspond to the multiple linear functions one by one; the second calculation unit is electrically connected to the first calculation unit, and is used to input the second digital voltage signal into a target linear function among the multiple linear functions, and output a compensation value, wherein the target linear function is a linear function corresponding to the voltage interval to which the second digital voltage signal belongs; the insulation value calculation unit is electrically connected to the second calculation unit, and is used to calculate the insulation value using the compensation value. In this embodiment, the first digital voltage signal is a data group composed of the digital voltage signals in the multiple digital voltage signal intervals and the actually collected digital voltage signals, and then the required data group is obtained for the selected linear function to calculate the linear parameters, thereby obtaining the linear function.

[0070] For example, the first digital voltage signal includes six groups of data, and one digital voltage signal is taken out from each of the digital voltage signal intervals [0, 20], [21, 40] and [41, 100], which are 10, 20, 30, 40, 60, and 80 respectively. Then, the actually collected digital voltage signals corresponding to each digital voltage signal are obtained, which are 10.1, 20.1, 30.2, 40.2, 60.3 and 80.3 respectively.

[0071] It can be seen that the first digital voltage signal interval corresponds to two sets of data, which are 10, 10.1 and 20, 20.1 respectively; the second digital voltage signal interval corresponds to two sets of data, which are 30, 30.2 and 40, 40.2 respectively; the third digital voltage signal interval corresponds to two sets of data, which are 60, 60.3 and 80, 80.3 respectively.

[0072] The two sets of data corresponding to each digital voltage signal interval are respectively input into the linear function: y=kx+b, and the values ​​of the linear parameters k and b corresponding to each digital voltage signal interval can be calculated. Specifically,

[0073] By using the formula: 10k+b=10.1, 20k+b=20.1, the linear parameters k1=1, b1=0.1 corresponding to the first digital voltage signal interval are calculated, that is, the linear function corresponding to the first digital voltage signal interval is y=x+0.1.

[0074] Through the formula: 30k+b=30.2, 40k+b=40.2, the linear parameters k2=1, b2=0.2 corresponding to the second digital voltage signal interval are calculated, that is, the linear function corresponding to the second digital voltage signal interval is y=x+0.2.

[0075] Through the formula: 60k+b=60.3, 80k+b=80.3, the linear parameters k3=1, b3=0.3 corresponding to the third digital voltage signal interval are calculated, that is, the linear function corresponding to the third digital voltage signal interval is y=x+0.3.

[0076] Then, the second digital voltage signal is obtained. It should be noted here that after obtaining the second digital voltage signal, it is necessary to first determine which digital voltage signal interval the second digital voltage signal belongs to, and then match the corresponding linear function. For example, if the second digital voltage signal obtained is 50v, it can be known that it belongs to the third digital voltage signal interval, and its corresponding linear function is y=x+0.3. The second digital voltage signal 50v can be substituted as input into the determined linear function y=x+0.3, and the calculated y value, that is, 50.3v, is the compensation value. Finally, the insulation value is calculated based on the calculated compensation value.

[0077] The present application adopts a multi-segment linear compensation method to divide each digital voltage signal interval, so that the linear function corresponding to the digital voltage signal interval is more accurate, thereby improving the accuracy of the compensation value, and further improving the accuracy and precision of the insulation value calculation.

[0078] The embodiment of the utility model provides an insulation detection system, including: a voltage acquisition unit, a voltage preprocessing unit and a micro control unit; the voltage acquisition unit is used to acquire the voltage of the whole vehicle; the voltage preprocessing unit is electrically connected to the voltage acquisition unit, and is used to preprocess the acquired whole vehicle voltage and output a digital voltage signal corresponding to the whole vehicle voltage; the micro control unit is electrically connected to the voltage preprocessing unit, and is used to calculate the insulation value of the whole vehicle based on the digital voltage signal and a preset compensation method. The utility model adopts low-cost components, so that the insulation detection system can meet the requirements of high precision and low cost at the same time.

[0079] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the utility model.

[0080] The following is an embodiment of the device of the present utility model. For details not described in detail, reference can be made to the corresponding method embodiments described above.

[0081] The present utility model also provides an insulation detection device and a vehicle, wherein the insulation detection device and the vehicle at least include an insulation detection system, wherein the insulation detection system includes:

[0082] Voltage acquisition unit, voltage preprocessing unit and micro control unit;

[0083] Voltage collection unit, used to collect the voltage of the entire vehicle;

[0084] A voltage preprocessing unit is electrically connected to the voltage acquisition unit and is used to preprocess the acquired vehicle voltage and output a digital voltage signal corresponding to the vehicle voltage;

[0085] The micro control unit is electrically connected to the voltage preprocessing unit and is used to calculate the insulation value of the entire vehicle based on the digital voltage signal and a preset compensation method.

[0086] In a possible implementation, the voltage preprocessing unit includes:

[0087] Voltage dividing resistors, voltage acquisition and conditioning circuits, and analog-to-digital converters;

[0088] A voltage-dividing resistor is electrically connected to the voltage acquisition unit and is used to divide the collected vehicle voltage into a low-amplitude analog voltage signal that meets the input range of the analog-to-digital converter;

[0089] The voltage acquisition and conditioning circuit is electrically connected to the voltage dividing resistor and is used to perform impedance matching on the low-amplitude analog voltage signal and output an analog voltage signal recognizable by the analog-to-digital converter;

[0090] The analog-to-digital converter is electrically connected to the voltage acquisition and conditioning circuit and is used for converting the analog voltage signal recognizable by the analog-to-digital converter into a digital voltage signal.

[0091] In a possible implementation, the voltage acquisition and conditioning circuit includes:

[0092] A first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, an operational amplifier, a first power supply, and a second power supply;

[0093] One end of the sixth resistor is electrically connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the positive electrode of the second power supply, the other end of the fourth resistor is electrically connected to the non-inverting input terminal of the amplifier, the inverting input terminal of the operational amplifier is electrically connected to one end of the third resistor, the other end of the third resistor is grounded, one end of the third resistor is also electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the output terminal of the operational amplifier and one end of the first resistor, the other end of the first resistor is electrically connected to one end of the first capacitor, the other end of the first capacitor is grounded, the power input terminal of the operational amplifier is electrically connected to the positive electrode of the first power supply and one end of the second capacitor, the other end of the second capacitor is grounded, and the power output terminal of the operational amplifier is grounded.

[0094] In a possible implementation, the preset compensation method includes at least a single linear compensation method and a multi-segment linear compensation method.

[0095] In a possible implementation, the preset compensation method is a single linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal;

[0096] Micro control unit, comprising:

[0097] A first calculation unit, a second calculation unit, and an insulation value calculation unit;

[0098] A first calculation unit, electrically connected to the voltage preprocessing unit, for calculating a linear parameter using a single linear compensation method and the first digital voltage signal, and determining a linear function based on the linear parameter;

[0099] A second calculation unit, electrically connected to the first calculation unit, and configured to input the second digital voltage signal into a linear function and output a compensation value;

[0100] The insulation value calculation unit is electrically connected to the second calculation unit and is used to calculate the insulation value using the compensation value.

[0101] In a possible implementation, the preset compensation method is a multi-segment linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal;

[0102] Micro control unit, comprising:

[0103] A first calculation unit, a second calculation unit, and an insulation value calculation unit;

[0104] A first calculation unit is electrically connected to the voltage preprocessing unit, and is used to calculate multiple sets of linear parameters using a multi-segment linear compensation method and the first digital voltage signal, and determine multiple linear functions based on the multiple sets of linear parameters, wherein the multiple sets of linear parameters correspond to the multiple linear functions one by one;

[0105] A second calculation unit, electrically connected to the first calculation unit, configured to input the second digital voltage signal into a target linear function among the plurality of linear functions, and output a compensation value, wherein the target linear function is a linear function corresponding to the voltage interval to which the second digital voltage signal belongs;

[0106] The insulation value calculation unit is electrically connected to the second calculation unit and is used to calculate the insulation value using the compensation value.

[0107] In a possible implementation, the insulation detection circuit further includes:

[0108] Reference source;

[0109] The reference source is electrically connected to the voltage preprocessing unit and is used to provide power to the voltage preprocessing unit.

[0110] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An insulation detection system, characterized in that: include: Voltage acquisition unit, voltage preprocessing unit and micro control unit; The voltage collection unit is used to collect the voltage of the entire vehicle; The voltage preprocessing unit is electrically connected to the voltage acquisition unit, and is used to preprocess the acquired vehicle voltage and output a digital voltage signal corresponding to the vehicle voltage; The micro control unit is electrically connected to the voltage preprocessing unit and is used to calculate the insulation value of the entire vehicle based on the digital voltage signal and a preset compensation method.

2. The insulation detection system according to claim 1, characterized in that: The voltage preprocessing unit comprises: Voltage dividing resistors, voltage acquisition and conditioning circuits, and analog-to-digital converters; The voltage dividing resistor is electrically connected to the voltage acquisition unit and is used to divide the collected vehicle voltage into an analog voltage signal with a low amplitude that meets the input range of the analog-to-digital converter; The voltage acquisition and conditioning circuit is electrically connected to the voltage dividing resistor, and is used to perform impedance matching on the low-amplitude analog voltage signal and output an analog voltage signal recognizable by the analog-to-digital converter; The analog-to-digital converter is electrically connected to the voltage acquisition and conditioning circuit, and is used to convert the analog voltage signal recognizable by the analog-to-digital converter into a digital voltage signal.

3. The insulation detection system according to claim 2, characterized in that: The voltage acquisition and conditioning circuit comprises: A first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, an operational amplifier, a first power supply, and a second power supply; One end of the sixth resistor is electrically connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the positive electrode of the second power supply, the other end of the fourth resistor is electrically connected to the non-inverting input terminal of the amplifier, the inverting input terminal of the operational amplifier is electrically connected to one end of the third resistor, the other end of the third resistor is grounded, one end of the third resistor is also electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the output terminal of the operational amplifier and one end of the first resistor, the other end of the first resistor is electrically connected to one end of the first capacitor, the other end of the first capacitor is grounded, the power input terminal of the operational amplifier is electrically connected to the positive electrode of the first power supply and one end of the second capacitor, the other end of the second capacitor is grounded, and the power output terminal of the operational amplifier is grounded.

4. The insulation detection system according to claim 1, characterized in that: The preset compensation method at least includes a single linear compensation method and a multi-segment linear compensation method.

5. The insulation detection system according to claim 4, characterized in that: The preset compensation method is a single linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal; The micro control unit comprises: A first calculation unit, a second calculation unit, and an insulation value calculation unit; The first calculation unit is electrically connected to the voltage preprocessing unit, and is used to calculate linear parameters using the single linear compensation method and the first digital voltage signal, and determine a linear function based on the linear parameters; The second calculation unit is electrically connected to the first calculation unit, and is used to input the second digital voltage signal into the linear function and output a compensation value; The insulation value calculation unit is electrically connected to the second calculation unit, and is used to calculate the insulation value using the compensation value.

6. The insulation detection system according to claim 4, characterized in that: The preset compensation method is a multi-segment linear compensation method, and the digital voltage signal includes a first digital voltage signal and a second digital voltage signal; The micro control unit comprises: A first calculation unit, a second calculation unit, and an insulation value calculation unit; The first calculation unit is electrically connected to the voltage preprocessing unit, and is used to calculate multiple groups of linear parameters using the multi-segment linear compensation method and the first digital voltage signal, and determine multiple linear functions based on the multiple groups of linear parameters, wherein the multiple groups of linear parameters correspond to the multiple linear functions one by one; The second calculation unit is electrically connected to the first calculation unit, and is used to input the second digital voltage signal into a target linear function among the multiple linear functions, and output a compensation value, wherein the target linear function is a linear function corresponding to the voltage interval to which the second digital voltage signal belongs; The insulation value calculation unit is electrically connected to the second calculation unit, and is used to calculate the insulation value using the compensation value.

7. The insulation detection system according to claim 1, characterized in that: The insulation detection system also includes: Reference source; The reference source is electrically connected to the voltage preprocessing unit and is used to provide power to the voltage preprocessing unit.

8. An insulation detection device, characterized in that: The insulation detection device at least comprises the insulation detection system according to any one of claims 1 to 7.

9. A vehicle, characterized in that: The vehicle comprises at least the insulation detection system according to any one of claims 1 to 7.

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