CN217901933U - Insulation sampling circuit and vehicle - Google Patents
Insulation sampling circuit and vehicle Download PDFInfo
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- CN217901933U CN217901933U CN202221195080.7U CN202221195080U CN217901933U CN 217901933 U CN217901933 U CN 217901933U CN 202221195080 U CN202221195080 U CN 202221195080U CN 217901933 U CN217901933 U CN 217901933U
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Abstract
The utility model provides an insulating sampling circuit and vehicle, include: the device comprises a first detection branch, a second detection branch, a third detection branch and a sampling module; the first detection branch circuit is connected in parallel with two ends of the anode insulation resistor and divides voltage at two ends of the anode insulation resistor; the second detection branch and the third detection branch are respectively connected in parallel with two ends of the negative insulation resistor, and the second detection branch and/or the third detection branch are started to adjust the current flowing through the first detection branch; the sampling module is connected to the output end of the first detection branch circuit and used for collecting the voltage division signal output by the first detection branch circuit. The utility model can realize insulation detection only by using one path of voltage acquisition, has simple structure and achieves the national standard acquisition precision; the insulation resistance can be calculated by using different methods according to different starting branches, the various methods can play a role in checking, and the accuracy and the reliability are ensured.
Description
Technical Field
The utility model relates to a vehicle field especially relates to an insulating sampling circuit and vehicle.
Background
With the continuous development of new energy industry, more and more people select electric vehicles to replace traditional fuel vehicles as travel tools, and the use safety of the electric vehicles is also a very concern of people. For a vehicle high-voltage system, an insulation fault has very serious harm, if the fault is small, high-voltage electric leakage is caused, electric energy resources are wasted, and if the fault is large, personal safety is harmed, so that the fault can be detected in time, and the fault is one of key points of the existing vehicle high-voltage system.
For an insulation detection circuit on an automobile, the national standard GBT18384 mainly detects an insulation resistance value by switching two series-connected voltage dividing resistors and high-voltage switching devices. The scheme needs two paths of voltage acquisition and has a complex structure; and the calculation mode of the insulation resistance is solidified, and once errors happen, a verification mechanism does not exist, so that the reliability is low.
Therefore, how to provide an insulation sampling scheme with simple structure and high reliability has become one of the technical problems to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings in the prior art, an object of the present invention is to provide an insulation sampling circuit and a vehicle, which are used for solving the problems of complex structure, low reliability and the like of the insulation sampling circuit in the prior art.
In order to achieve the above and other related objects, the present invention provides an insulation sampling circuit for detecting a positive insulation resistance and a negative insulation resistance, wherein the positive insulation resistance is connected between a positive electrode of a battery and a ground terminal, and the negative insulation resistance is connected between a negative electrode of the battery and the ground terminal; the insulated sampling circuit at least comprises:
the device comprises a first detection branch, a second detection branch, a third detection branch and a sampling module;
the first detection branch circuit is connected in parallel with two ends of the anode insulation resistor and divides voltage at two ends of the anode insulation resistor;
the second detection branch and the third detection branch are respectively connected in parallel with two ends of the negative insulation resistor, and the second detection branch and/or the third detection branch are started to adjust the current flowing through the first detection branch;
the sampling module is connected to the output end of the first detection branch circuit and collects the voltage division signal output by the first detection branch circuit.
Preferably, the ground terminal is a frame potential.
More preferably, the first detection branch comprises a first resistance unit and a second resistance unit; the first end of the first resistance unit is connected with the anode of the battery, and the second end of the first resistance unit is connected with the first end of the second resistance unit; and the second end of the second resistance unit is connected with the grounding end.
More preferably, the input end of the sampling module is connected to two ends of the second resistance unit.
More preferably, the second detection branch comprises a first switch and a third resistance unit; the first switch is connected in series with the third resistance unit.
More preferably, the third detection branch comprises a second switch and a fourth resistance unit; the second switch is connected in series with the fourth resistance unit.
More preferably, the insulation sampling circuit further comprises an insulation resistance calculation module; the insulation resistance calculation module is connected to the output end of the sampling module, obtains device parameters and battery voltage of each detection branch, and calculates the resistance values of the anode insulation resistance and the cathode insulation resistance.
To achieve the above and other related objects, the present invention also provides a vehicle, comprising at least: the insulation sampling circuit.
As described above, the utility model discloses an insulating sampling circuit and vehicle has following beneficial effect:
1. the utility model discloses an insulating sampling circuit only needs to use voltage acquisition all the way can realize insulating detection, simple structure; and the acquisition precision reaches the national standard requirement.
2. The utility model discloses an insulating sampling circuit accessible launches the difference of branch road and uses different methods to calculate insulation resistance, can play the effect of check-up between the various methods, ensures accuracy and reliability.
Drawings
Fig. 1 shows a schematic structural diagram of the insulation sampling circuit of the present invention.
Description of the element reference
1. Insulation sampling circuit
11. First detection branch
12. Second detection branch
13. Third detection branch
14. Sampling module
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
Please refer to fig. 1. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
As shown in fig. 1, the utility model provides an insulating sampling circuit 1 for detect positive insulation resistance Rp and negative pole insulation resistance Rn, positive insulation resistance Rp connects between battery positive pole HV + and earthing terminal GND, negative pole insulation resistance Rn connects between battery negative pole HV-and earthing terminal GND. The insulated sampling circuit 1 includes:
a first detection branch 11, a second detection branch 12, a third detection branch 13 and a sampling module 14.
As shown in fig. 1, the first detecting branch 11 is connected in parallel to two ends of the positive insulation resistor Rp, and divides the voltage across the positive insulation resistor Rp.
Specifically, in this embodiment, the first detecting branch 11 includes a first resistance unit R1 and a second resistance unit R2. The first end of the first resistor unit R1 is connected with the battery anode HV +, and the second end is connected with the first end of the second resistor unit R2; the second end of the second resistance unit R2 is connected to the ground GND. The first resistor unit R1 and the second resistor unit R2 divide the voltage across the positive insulation resistor Rp.
It should be noted that the first resistance unit R1 is a single resistance or a series, parallel, series and parallel structure of multiple resistances; similarly, the second resistance unit R2 is a single resistance or a series, parallel, series-parallel structure of multiple resistances; not repeated herein.
As shown in fig. 1, the second detection branch 12 is connected in parallel to two ends of the negative insulation resistor Rn.
Specifically, in the present embodiment, the second detecting branch 12 includes a first switch S1 and a third resistance unit R3; the first switch S1 is connected in series with the third resistance unit R3. As an example, one end of the first switch S1 is connected to the ground GND, and the other end is connected to the first end of the third resistance unit R3; the second end of the third resistance unit R3 is connected with the negative electrode HV < - >; in practical use, the positions of the first switch S1 and the third resistor unit R3 may be interchanged, and the on and off of the first switch S1 may directly determine whether the third resistor unit R3 is connected to the voltage collecting path, which is not limited to this embodiment.
It should be noted that the third resistance unit R3 is a single resistance or a series, parallel, series and parallel structure of multiple resistances, which is not described herein again.
As shown in fig. 1, the third detection branch 13 is connected in parallel to two ends of the negative insulation resistor Rn.
Specifically, in this embodiment, the third detecting branch 13 includes a second switch S2 and a fourth resistance unit R4; the second switch S2 is connected in series with the fourth resistance unit R4. As an example, one end of the second switch S2 is connected to the ground GND, and the other end is connected to the first end of the fourth resistance unit R4; the second end of the fourth resistance unit R4 is connected with the negative electrode HV < - >; in practical use, the positions of the second switch S2 and the fourth resistance unit R4 may be interchanged, and the on and off of the second switch S2 can directly determine whether the fourth resistance unit R4 is connected to the voltage collecting path, which is not limited to this embodiment.
It should be noted that the fourth resistance unit R4 is a single resistance or a series, parallel, series-parallel structure of multiple resistances, which is not described herein in detail.
Specifically, the second detection branch 12 and the third detection branch 13 respectively realize the relationship with the voltage acquisition path through internal switches, and the second detection branch 12 and/or the third detection branch 13 may be activated to adjust the current flowing through the first detection branch 11, so as to affect the sampled voltage.
As shown in fig. 1, the sampling module 14 is connected to an output end of the first detection branch 11, and collects a voltage division signal output by the first detection branch 11.
Specifically, in this embodiment, for convenience of calculation, the input end of the sampling module 14 is connected to two ends of the second resistance unit R2, and the voltage of the second resistance unit R2 is obtained as a sampling signal. In practical use, the sampling module 14 may also be connected to two ends of the first resistance unit R1, which is not limited to this embodiment.
As another implementation manner of the present invention, the insulation sampling circuit 1 further includes an insulation resistance calculation module (not shown in the figure). The insulation resistance calculation module is connected to the output end of the sampling module 14, obtains device parameters and battery voltage of each detection branch, and calculates resistance values of the positive insulation resistance Rp and the negative insulation resistance Rn.
In this embodiment, the insulation sampling circuit 1 is applied to a vehicle high-voltage system, and the ground GND is a frame potential. In practical use, the grounding end may be determined according to different application scenarios, including but not limited to a motor housing and an air conditioner external housing, which are not described herein one by one.
The sampling principle of the insulation sampling circuit 1 is as follows:
in the sampling method 1, first, the first switch S1 is closed, the second switch S2 is turned off, at this time, the first resistance unit R1, the second resistance unit R2, and the third resistance unit R3 form a voltage acquisition path, and the sampling module 14 acquires a voltage, denoted as U, at two ends of the second resistance unit R2 S1 (ii) a Then, the second switch S2 is closed, at this time, after the third resistance unit R3 is connected in parallel with the fourth resistance unit R4, the third resistance unit R3 is sequentially connected in series with the first resistance unit R1 and the second resistance unit R2 to form a voltage acquisition path, and the sampling module 14 acquires the voltage at the two ends of the second resistance unit R2, which is marked as U S2 (ii) a The following relationship is obtained:
wherein, U General assembly The total voltage of the battery is Rp, rn, R1, R2, R3 and R4, wherein Rp is the resistance value of the positive insulation resistor, rn is the resistance value of the negative insulation resistor, R1 is the resistance value of the first resistor unit, R2 is the resistance value of the second resistor unit, and R3 is the resistance value of the third resistor unit. And (2) solving the equations (1) and (2) to obtain that the resistance values of the positive insulation resistance Rp and the negative insulation resistance Rn satisfy the following relational expression:
the sampling method 2 includes firstly closing the first switch S1 and turning off the second switch S2, at this time, the first resistance unit R1, the second resistance unit R2 and the third resistance unit R3 form a voltage acquisition path, and the sampling module 14 acquires a voltage at two ends of the second resistance unit R2, which is marked as U S3 (ii) a Then, the first switch S1 is turned off, the second switch S2 is turned on, at this time, the first resistance unit R1, the second resistance unit R2, and the fourth resistance unit R4 form a voltage acquisition path, and the sampling module 14 acquires the voltage at two ends of the second resistance unit R2, which is marked as U S4 (ii) a The following relationship is obtained:
and (3) solving the equations (5) and (6) simultaneously to obtain that the resistance values of the positive insulation resistance Rp and the negative insulation resistance Rn satisfy the following relational expression:
it should be noted that, in practical use, the first switch S1 may be turned off, the second switch S2 may be turned on, and then the first switch S1 and the second switch S2 may be turned on, so as to obtain the resistance values of the positive insulation resistor Rp and the negative insulation resistor Rn, which is not described herein again. The detection result can be obtained by any one method or two or more methods, and the two or more methods can be mutually verified when being adopted, so that the accuracy and the reliability are improved.
The utility model provides a vehicle, the vehicle includes insulating sampling circuit 1, insulating sampling circuit 1 is used for detecting the insulation fault of vehicle, and then ensures the safe in utilization of vehicle.
To sum up, the utility model provides an insulation sampling circuit and a vehicle for detecting a positive insulation resistance and a negative insulation resistance, wherein the positive insulation resistance is connected between a battery positive pole and a grounding terminal, and the negative insulation resistance is connected between a battery negative pole and the grounding terminal; the insulated sampling circuit at least comprises: the device comprises a first detection branch, a second detection branch, a third detection branch and a sampling module; the first detection branch circuit is connected in parallel with two ends of the anode insulation resistor and divides voltage at two ends of the anode insulation resistor; the second detection branch and the third detection branch are respectively connected in parallel to two ends of the negative insulation resistor, and the second detection branch and/or the third detection branch are started to adjust the magnitude of current flowing through the first detection branch; the sampling module is connected to the output end of the first detection branch circuit and collects the voltage division signal output by the first detection branch circuit. The utility model discloses an insulating sampling circuit only needs to use voltage acquisition all the way can realize insulating detection, simple structure, and the collection precision reaches the national standard requirement; the insulation resistance can be calculated by different methods according to different starting branches, the various methods can play a role in checking, and accuracy and reliability are ensured. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The utility model provides an insulating sampling circuit for detect anodal insulation resistance and negative pole insulation resistance, anodal insulation resistance connects between battery positive pole and earthing terminal, negative pole insulation resistance connects between battery negative pole and earthing terminal, its characterized in that: the insulated sampling circuit at least comprises:
the device comprises a first detection branch, a second detection branch, a third detection branch and a sampling module;
the first detection branch circuit is connected in parallel with two ends of the anode insulation resistor and divides voltage at two ends of the anode insulation resistor;
the second detection branch and the third detection branch are respectively connected in parallel to two ends of the negative insulation resistor, and the second detection branch and/or the third detection branch are started to adjust the magnitude of current flowing through the first detection branch;
the sampling module is connected to the output end of the first detection branch circuit and collects the voltage division signal output by the first detection branch circuit.
2. The isolated sampling circuit of claim 1, wherein: the grounding end is the frame potential.
3. The isolated sampling circuit of claim 1 or 2, wherein: the first detection branch comprises a first resistance unit and a second resistance unit; the first end of the first resistance unit is connected with the anode of the battery, and the second end of the first resistance unit is connected with the first end of the second resistance unit; and the second end of the second resistance unit is connected with the grounding end.
4. The isolated sampling circuit of claim 3, wherein: and the input end of the sampling module is connected with the two ends of the second resistance unit.
5. The isolated sampling circuit of claim 1 or 2, wherein: the second detection branch comprises a first switch and a third resistance unit; the first switch is connected in series with the third resistance unit.
6. The isolated sampling circuit of claim 1 or 2, wherein: the third detection branch comprises a second switch and a fourth resistance unit; the second switch is connected in series with the fourth resistance unit.
7. The isolated sampling circuit of claim 1 or 2, wherein: the insulation sampling circuit also comprises an insulation resistance calculation module; the insulation resistance calculation module is connected to the output end of the sampling module, obtains device parameters and battery voltage of each detection branch, and calculates the resistance values of the anode insulation resistance and the cathode insulation resistance.
8. A vehicle, characterized in that it comprises at least: an isolated sampling circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221195080.7U CN217901933U (en) | 2022-05-17 | 2022-05-17 | Insulation sampling circuit and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221195080.7U CN217901933U (en) | 2022-05-17 | 2022-05-17 | Insulation sampling circuit and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN217901933U true CN217901933U (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221195080.7U Active CN217901933U (en) | 2022-05-17 | 2022-05-17 | Insulation sampling circuit and vehicle |
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| CN (1) | CN217901933U (en) |
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- 2022-05-17 CN CN202221195080.7U patent/CN217901933U/en active Active
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