Charging pile insulation detection device and charging pile

Abstract

The present application discloses a charging pile insulation detection device and a charging pile. The charging pile insulation detection device includes a first resistor, a second resistor, a third resistor, a first detection resistor and a second detection resistor, and a positive bus switch and a negative bus switch. The first resistor and the third resistor are connected in series between the positive bus and the negative bus to form a first branch. The first detection resistor and the second detection resistor are connected in series between the positive bus and the negative bus to form a second branch. The first branch and the second branch are connected in parallel; the second resistor is connected in parallel with the second detection resistor and the third resistor, respectively. In this way, different combinations of the first resistor, the second resistor, and the third resistor can realize different circuit working states, and then the resistance values ​​of the first detection resistor and the second detection resistor can be derived to realize insulation detection. The structure is simple and stable, and the cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of charging piles, and more specifically, to a charging pile insulation detection device and a charging pile. Background Art

[0002] With the rapid development of electric vehicle and charging pile charging module technology and rechargeable battery technology, the safety of electric vehicles and charging piles has become more and more the focus of attention. Due to the high voltage and high current output characteristics of DC charging piles, once an insulation failure occurs, it will easily cause damage to the equipment and even threaten the personal safety of the user. Insulation failure of the charging pile charging module may cause electric shock accidents, so insulation detection is crucial to the safe charging of the charging pile. In the relevant technology, conventional insulation monitoring methods include balanced bridge method and double-terminal unbalanced bridge method. When the balanced bridge method is grounded at both ends, the detection error is large; the double-terminal unbalanced bridge method has complex detection steps. During the detection, the positive and negative busbars need to be connected to the ground with resistance respectively. The voltage between the positive and negative busbars and the ground is changing. After each resistance is added, it is necessary to delay and wait for the voltage between the busbar and the ground to stabilize. The detection speed is slow, and the circuit structure is complex and the cost is high. Utility Model Content

[0003] Embodiments of the present application provide a charging pile insulation detection device and a charging pile.

[0004] The charging pile insulation detection device of the embodiment of the present application includes: a first resistor, a second resistor, a third resistor, a first detection resistor and a second detection resistor, and a positive bus switch and a negative bus switch. The first resistor and the third resistor are connected in series between the positive bus and the negative bus to form a first branch, the first detection resistor and the second detection resistor are connected in series between the positive bus and the negative bus to form a second branch, and the first branch and the second branch are connected in parallel; the second resistor is connected in parallel with the second detection resistor and the third resistor respectively, the first end of the second resistor is connected to the first branch and the second branch respectively, and the second end of the second resistor is connected to the negative bus; the positive bus switch is set on the positive bus, and the negative bus switch is set on the negative bus.

[0005] In the charging pile insulation detection device of the embodiment of the present application, the charging pile insulation detection device includes: a first resistor, a second resistor, a third resistor, a first detection resistor and a second detection resistor, and a positive bus switch and a negative bus switch. The first resistor and the third resistor are connected in series between the positive bus and the negative bus to form a first branch. The first detection resistor and the second detection resistor are connected in series between the positive bus and the negative bus to form a second branch. The first branch and the second branch are connected in parallel. The second resistor is connected in parallel with the second detection resistor and the third resistor respectively. The first end of the second resistor is connected to the first branch and the second branch respectively, and the second end of the second resistor is connected to the negative bus. The positive bus switch is set on the positive bus, and the negative bus switch is set on the negative bus. In this way, different combinations of the first resistor, the second resistor, and the third resistor can realize different circuit working states, and then the resistance values ​​of the first detection resistor and the second detection resistor can be derived to realize insulation detection. The structure is simple and stable, and the cost is low. At the same time, in addition to the output side positive and negative pole insulation detection function, it also has positive bus switch and negative bus switch fault diagnosis, positive bus and negative bus output side short circuit detection, with complete functions.

[0006] In some embodiments, the positive bus switch is disposed between the first branch and the second branch, a first end of the positive bus switch is connected to a first end of the first resistor, and a second end of the positive bus switch is connected to a first end of the first detection resistor;

[0007] The negative bus switch is arranged between the first branch and the second branch, the first end of the negative bus switch is connected to the second end of the third resistor, and the second end of the negative bus switch is connected to the second end of the second detection resistor.

[0008] In some embodiments, the distance from the location where the second resistor is connected to the negative bus to the negative bus switch is farther than the distance from the location where the second detection resistor is connected to the negative bus to the negative bus switch.

[0009] In some embodiments, the charging pile insulation detection device further includes a shunt, which is disposed on the negative bus, and the second end of the second resistor is connected to the shunt.

[0010] In some embodiments, the charging pile insulation detection device also includes a first switch, a second switch and a third switch, the first switch and the third switch are connected in series between the second end of the first resistor and the first end of the third resistor, the first end of the second switch is connected between the second end of the first detection resistor and the first end of the second detection resistor, and the second end of the second switch is connected to the first end of the second resistor.

[0011] In some embodiments, the charging pile insulation detection device also includes a first sampling resistor and a second sampling resistor, the first end of the first sampling resistor is connected to the second end of the first resistor, the second end of the first sampling resistor is connected to the first switch, the first end of the second sampling resistor is connected to the second switch, and the second end of the second sampling resistor is connected to the first end of the second resistor.

[0012] In some embodiments, the charging pile insulation detection device also includes a third branch and a fourth branch, the first end of the third branch is connected to the first branch and is arranged between the first switch and the third switch, the second end of the third branch is connected to the first end of the second sampling resistor, the first end of the fourth branch is connected to the second branch and is arranged between the first detection resistor and the second detection resistor, and the second end of the fourth branch is connected to the first end of the second sampling resistor.

[0013] In some embodiments, the charging pile insulation detection device further includes a fifth branch, a first end of the fifth branch is connected to the fourth branch and is arranged between the second switch and the second branch, and a second end of the fifth branch is grounded.

[0014] In some embodiments, the first switch, the second switch, and the third switch are all electronic switches.

[0015] The charging pile of the implementation mode of the present application includes the charging pile insulation detection device described in any one of the above implementation modes.

[0016] In the charging pile insulation detection device and the charging pile of the embodiment of the present application, the charging pile insulation detection device includes: a first resistor, a second resistor, a third resistor, a first detection resistor and a second detection resistor, and a positive bus switch and a negative bus switch. The first resistor and the third resistor are connected in series between the positive bus and the negative bus to form a first branch. The first detection resistor and the second detection resistor are connected in series between the positive bus and the negative bus to form a second branch. The first branch and the second branch are connected in parallel. The second resistor is connected in parallel with the second detection resistor and the third resistor respectively. The first end of the second resistor is connected to the first branch and the second branch respectively, and the second end of the second resistor is connected to the negative bus. The positive bus switch is set on the positive bus, and the negative bus switch is set on the negative bus. In this way, different combinations of the first resistor, the second resistor, and the third resistor can realize different circuit working states, and then the resistance values ​​of the first detection resistor and the second detection resistor can be derived to realize insulation detection. The structure is simple and stable, and the cost is low. At the same time, in addition to the output side positive and negative pole insulation detection function, it also has positive bus switch and negative bus switch fault diagnosis, positive bus and negative bus output side short circuit detection, with complete functions.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a charging pile insulation detection device according to an embodiment of the present application;

[0020] Figure 2 It is a module schematic diagram of a charging station according to an embodiment of the present application.

[0021] Description of main component symbols:

[0022] Charging pile insulation detection device 100;

[0023] The first switch S1, the second switch S2, the third switch S3, the first resistor R1, the second resistor R2, the third resistor R3, the first detection resistor R+, the second detection resistor R-, the positive bus switch K1, the negative bus switch K2, the first sampling resistor r1, the second sampling resistor r2, the first branch 10, the second branch 20, the third branch 30, the fourth branch 40, the fifth branch 50, the positive bus 60, the negative bus 70, the shunt 80, the charging pile 200, and the charging station 300. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and examples of materials provided in the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0027] See also Figure 1 The charging pile insulation detection device 100 of the embodiment of the present application includes: a first resistor R1, a second resistor R2, a third resistor R3, a first detection resistor R+ and a second detection resistor R-, a positive bus switch K1 and a negative bus switch K2.

[0028] The first resistor R1 and the third resistor R3 are connected in series between the positive bus 60 and the negative bus 70 to form a first branch 10. The first detection resistor R+ and the second detection resistor R- are connected in series between the positive bus 60 and the negative bus 70 to form a second branch 20. The first branch 10 and the second branch 20 are connected in parallel.

[0029] The second resistor R2 is connected in parallel with the second detection resistor R− and the third resistor R3 , respectively. The first end of the second resistor R2 is connected to the first branch 10 and the second branch 20 , respectively. The second end of the second resistor R2 is connected to the negative bus 70 .

[0030] The positive bus switch K1 is disposed on the positive bus 60 , and the negative bus switch K2 is disposed on the negative bus 70 .

[0031] In some embodiments, the charging pile insulation detection device 100 of the embodiment of the present application can be used for the charging pile 200 .

[0032] In the charging pile insulation detection device 100 of the embodiment of the present application, different combinations of the first resistor R1, the second resistor R2, and the third resistor R3 can realize different circuit working states, and then the resistance values ​​of the first detection resistor R+ and the second detection resistor R- can be derived to realize insulation detection, which has a simple and stable structure and low cost. At the same time, in addition to the output side positive and negative pole insulation detection function, it also has the positive bus switch K1 and the negative bus switch K2 fault diagnosis, the output side short circuit detection of the positive bus 60 and the negative bus 70, and the functions are complete. The specific structure of the charging pile insulation detection device 100 is described below.

[0033] Please combine Figure 1In the charging pile insulation detection device 100 of the embodiment of the present application, the upward end of the element is the first end, and the downward end of the element is the second end.

[0034] See also Figure 1 In some embodiments, the positive bus switch K1 is disposed between the first branch 10 and the second branch 20, the first end of the positive bus switch K1 is connected to the first end of the first resistor R1, and the second end of the positive bus switch K1 is connected to the first end of the first detection resistor R+.

[0035] The negative bus switch K2 is arranged between the first branch 10 and the second branch 20, the first end of the negative bus switch K2 is connected to the second end of the third resistor R3, and the second end of the negative bus switch K2 is connected to the second end of the second detection resistor R-.

[0036] Specifically, the first end of the first resistor R1 and the first end of the first detection resistor R+ are respectively arranged at both ends of the positive bus switch K1, and the second end of the third resistor R3 and the second end of the second detection resistor R- are respectively arranged at both ends of the negative bus switch K2.

[0037] See also Figure 1 In some embodiments, the distance from the position where the second resistor R2 is connected to the negative bus 70 to the negative bus switch K2 is farther than the distance from the position where the second detection resistor R- is connected to the negative bus 70 to the negative bus switch K2. In other words, the second detection resistor R- is closer to the negative bus switch K2 than the second resistor R2.

[0038] See also Figure 1 In some embodiments, the charging pile insulation detection device 100 further includes a shunt 80 , which is disposed on the negative bus 70 , and the second end of the second resistor R2 is connected to the shunt 80 .

[0039] In some embodiments, the charging pile insulation detection device 100 also includes a first switch S1, a second switch S2 and a third switch S3, the first switch S1 and the third switch S3 are connected in series between the second end of the first resistor R1 and the first end of the third resistor R3, the first end of the second switch S2 is connected between the second end of the first detection resistor R+ and the first end of the second detection resistor R-, and the second end of the second switch S2 is connected to the first end of the second resistor R2.

[0040] Specifically, the first switch S1 is disposed between the second end of the first resistor R1 and the first branch 10 , the second switch S2 is disposed on the second branch 20 , and the third switch S3 is disposed between the first end of the third resistor R3 and the first branch 10 .

[0041] See also Figure 1In some embodiments, the charging pile insulation detection device 100 also includes a first sampling resistor r1 and a second sampling resistor r2, the first end of the first sampling resistor r1 is connected to the second end of the first resistor R1, the second end of the first sampling resistor r1 is connected to the first switch S1, the first end of the second sampling resistor r2 is connected to the second switch S2, and the second end of the second sampling resistor r2 is connected to the first end of the second resistor R2.

[0042] See also Figure 1 In some embodiments, the charging pile insulation detection device 100 also includes a third branch 30 and a fourth branch 40, the first end of the third branch 30 is connected to the first branch 10 and is arranged between the first switch S1 and the third switch S3, the second end of the third branch 30 is connected to the first end of the second sampling resistor R-, the first end of the fourth branch 40 is connected to the second branch 20 and is arranged between the first detection resistor R+ and the second detection resistor R-, and the second end of the fourth branch 40 is connected to the first end of the second sampling resistor R-.

[0043] In some embodiments, the first switch S1 , the second switch S2 , and the third switch S3 are all electronic switches.

[0044] The electronic switch has a fast response speed and high control accuracy, and can meet the use requirements of the charging pile insulation detection device 100. The electronic switch can be a bipolar transistor, a field effect transistor, an insulated gate bipolar transistor, an optical coupler, a relay, etc., which are not limited here.

[0045] In some embodiments, the charging pile insulation detection device 100 further includes a fifth branch 50 , a first end of the fifth branch 50 is connected to the fourth branch 40 and is disposed between the second switch S2 and the second branch 20 , and a second end of the fifth branch 50 is grounded.

[0046] Specifically, in the charging pile insulation detection device 100 of the embodiment of the present application, the first switch S1, the second switch S2 and the third switch S3 are added to the circuit, and different closed combinations of the first switch S1, the second switch S2 and the third switch S3 are controlled to realize the switching of different working states of the circuit system, so that the corresponding circuit resistance equation group can be established, and the combination of the equation group can calculate the insulation resistance of the positive and negative electrodes on the output side, that is, the first detection resistor R+ and the second detection resistor R- are calculated. The charging pile insulation detection device 100 of the embodiment of the present application has a simple structural design, which is conducive to stable system operation, low failure rate, and has the advantages of low hardware cost.

[0047] The charging pile insulation monitoring device 100 of the implementation mode of the present application can control the first switch S1, the second switch S2 and the third switch S3 to implement different working state combinations to obtain the corresponding set of equations. The result of the joint deduction is the insulation value of the positive and negative output sides to the ground wire and the calculation formula of the first detection resistor R+ and the second detection resistor R-, so as to determine whether there is an abnormality in the insulation and realize insulation detection of the charging pile and the charging vehicle.

[0048] In an example, the specific steps of insulation detection are as follows:

[0049] Step 1: According to the design of the DC charging control guidance process of the relevant specification protocol, the CAN message of the vehicle's BHM (BMS handshake Message) carries the insulation detection voltage V. The charging pile 200 receives this message and drives a high-voltage power supply module to boost the voltage according to this data, wherein the output wiring of the high-voltage power supply module is uniformly connected to DC+ and DC-. It should be noted that in this step, in order to avoid affecting the accuracy of insulation detection, it is not appropriate to drive multiple modules to boost the voltage. The status frame of the high-voltage power supply module is read back at the charging pile 200 end. After the module is boosted to the required value, the positive bus switch K1 and the negative bus switch K2 are closed, and the insulation detection process is officially entered to check the insulation of the charging pile 200 (including the charging cable) and the vehicle.

[0050] Step 2: Close the first switch S1 and the second switch S2 and open the third switch S3 at the same time, and establish equation (1) of the first detection resistor R+ and the second detection resistor R-:

[0051]

[0052] Among them, U1 is R + The actual sampling voltage on both sides, U2 is R - The actual sampled voltage on both sides, " / / " indicates that the resistors are connected in parallel, and the same symbols below have the same meaning, so they will not be repeated. At this stage, the two AD sampling channels of the system sample the DC+ and DC- voltages, drive multiple rounds of sampling, and calculate the average value of U1 and U2.

[0053] Step 3: Close the first switch S1, the second switch S2 and the third switch S3, and establish equation (2) of the first detection resistor R+ and the second detection resistor R-:

[0054]

[0055] Among them, U3 is R + The actual sampling voltage on both sides, U4 is R - The actual sampling voltage on both sides, at this stage, the two AD sampling channels of the system sample the DC+ and DC- voltages, drive multiple rounds of sampling, and calculate the average value of U3 and U4.

[0056] At this time, UUU and U in the equation group are the known actual voltage sampling average values, and equations 1 and 2 are combined, and let We get equation (3):

[0057]

[0058] Re-order Substituting into equation (2), we obtain equation (4):

[0059]

[0060] Step 4: After the charging pile 200 receives the insulation detection voltage data of the vehicle, the charging pile 200 is responsible for driving the high-voltage power supply module to boost the voltage for insulation inspection inside the charging pile 200 and the vehicle as a whole. The R+ and R- obtained in steps 2 and 3 are the insulation resistances from the positive and negative output sides to PE. R takes the minimum value of R+ and R-, divided by the insulation detection voltage V of the vehicle (data from step 1).

[0061] Specifically, the result of the insulation check can be obtained by analyzing the result of R / V. In one example, when (R / V)>500Ω / V, the charging pile is considered safe. When 100Ω / V<(R / V)<500Ω / V, an abnormal insulation alarm of the charging pile needs to be reported, but charging can be carried out normally. When (R / V)<100Ω / V, the charging pile is considered to have an insulation failure. If a device is connected to the charging pile, charging will be automatically stopped. It should be noted that the relevant data of R / V is only for illustrative purposes and does not represent a limitation on this application.

[0062] In addition, the embodiment of the present application can also control the first switch S1, the second switch S2 and the third switch S3 to implement different working states, realize the fault diagnosis of the positive bus switch K1 and the negative bus switch K2 and the output side short circuit detection of the positive bus 60 and the negative bus 70. Specifically, the detection strategy of the disconnection and adhesion detection of the two switches K1 and K2 is specifically described below:

[0063] I. Detection of adhesion condition of positive bus switch K1:

[0064] The positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are respectively controlled to be in the following states:

[0065] K1-off, K2-off

[0066] S1-on, S2-off, S3-off

[0067] The operating condition analysis is performed based on the voltage outside the positive bus switch K1: if it is detected that the voltage outside the positive bus switch K1 is greater than a predetermined voltage value, such as 80V, the positive bus switch K1 is stuck, that is, the positive bus switch K1 should be disconnected but is not disconnected.

[0068] II. Detection of the non-closing condition of the positive bus switch K1:

[0069] The positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are respectively controlled to be in the following states:

[0070] K1-on, K2-off

[0071] S1-on, S2-off, S3-off

[0072] The operating condition analysis is performed based on the voltage outside the positive bus switch K1: if the sampling value of the voltage outside the positive bus switch K1 is very small, it means that the positive bus switch K1 is not closed, that is, the positive bus switch K1 should be closed but is not closed, otherwise the positive bus switch K1 is closed.

[0073] III. Detection of short circuit conditions:

[0074] First, the positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are controlled to be in the following states:

[0075] K1-on, K2-off

[0076] S1-on, S2-off, S3-off

[0077] In this working state, the positive and negative voltages of the battery are sampled;

[0078] Let fDCNegativeVolt be the positive electrode sampling voltage of the battery;

[0079] fDCNegativeVolt is the negative electrode sampling voltage of the battery;

[0080] It can be obtained that: shortCheckV = fDCNegativeVolt;

[0081] shortCheckOutV=fDCNegativeVolt+fBatterPosVolt;

[0082] Lambuda1=fDCNegativeVolt / (fDCNegativeVolt+fBatterPosVolt);

[0083] Then, the switching circuit controls the positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 to be in the following states respectively:

[0084] K1-on, K2-off

[0085] S1-on, S2-off, S3-on

[0086] Get the Lambda2 value after switching

[0087] Lambuda2=fDCNegativeVolt / (fDCNegativeVolt+fBatterPosVolt);

[0088] According to Lambuda1 and Lambuda2, the working condition analysis is carried out:

[0089] If there is a short circuit, the corresponding Lambuda values ​​of the two circuits before and after the switches S1, S2, and S3 are switched are quite different. If there is no short circuit, the circuit does not change, and the corresponding Lambuda values ​​are infinitely close.

[0090] IV. Adhesion detection of negative bus switch K2:

[0091] First, the positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are controlled to be in the following states:

[0092] K1-on, K2-off

[0093] S1-on, S2-off, S3-off

[0094] Order: Lambuda1 = U1 / U2;

[0095] Then, the positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are controlled to be in the following states respectively:

[0096] K1-on, K2-off

[0097] S1-on, S2-off, S3-on

[0098] Order: Lambuda2 = U1 / U2;

[0099] Among them, U1 is the sampling voltage outside the positive bus switch K1, and U2 is the sampling voltage outside the negative bus switch K2.

[0100] According to Lambuda1 and Lambuda2, the working condition analysis is performed: if the negative bus switch K2 is disconnected, then Lambuda1 and Lambuda2 are infinitely close; if the negative bus switch K2 is adhered, that is, the positive bus switch K1 should be disconnected but is not disconnected, 1.0 <Lambuda2 / Lambuda1<2.0。

[0101] V.K2 non-closed detection:

[0102] First, the positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are controlled to be in the following states:

[0103] K1-on, K2-on

[0104] S1-on, S2-off, S3-off

[0105] Order: Lambuda1 = U1 / U2

[0106] Then, the positive bus switch K1, the negative bus switch K2, the first switch S1, the second switch S2 and the third switch S3 are controlled to be in the following states respectively:

[0107] K1-on, K2-on

[0108] S1-on, S2-off, S3-on

[0109] Order: Lambuda2 = U1 / U2;

[0110] Among them, U1 is the sampling voltage outside the positive bus switch K1, and U2 is the sampling voltage outside the negative bus switch K2.

[0111] According to Lambuda1 and Lambuda2, the working condition analysis is performed: if K2 is not closed, that is, the positive bus switch K1 should be closed but is not closed, then Lambuda1 and Lambuda2 are infinitely close; if K2 is adhered, 1.0 <Lambuda2 / Lambuda1<2.0。

[0112] To sum up, the charging pile insulation detection device 100 of the embodiment of the present application has a simple and stable circuit design and low cost. In addition to the output side positive and negative pole insulation detection function, it also has the functions of K1 and K2 switch fault diagnosis and output side short circuit detection.

[0113] See also Figure 2 The charging pile 200 of the embodiment of the present application includes the charging pile insulation detection device 100 of any one of the above-mentioned embodiments.

[0114] See also Figure 2The charging station 300 of the embodiment of the present application includes the charging pile 200 of the above embodiment.

[0115] In the charging pile insulation detection device 100, the charging pile 200 and the charging station 300 of the embodiment of the present application, the charging pile insulation detection device 100 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first detection resistor R+ and a second detection resistor R-, and a positive bus switch K1 and a negative bus switch K2. The first resistor R1 and the third resistor R3 are connected in series between the positive bus 60 and the negative bus 70 to form a first branch 10, and the first detection resistor R+ and the second detection resistor R- are connected in series between the positive bus 60 and the negative bus 70 to form a second branch 20. The first branch 10 and the second branch 20 are connected in parallel; the second resistor R2 is connected in parallel with the second detection resistor R- and the third resistor R3, respectively, the first end of the second resistor R2 is connected to the first branch 10 and the second branch 20, respectively, and the second end of the second resistor R2 is connected to the negative bus 70; the positive bus switch K1 is arranged on the positive bus 60, and the negative bus switch K2 is arranged on the negative bus 70. In this way, different combinations of the first resistor R1, the second resistor R2, and the third resistor R3 can achieve different circuit working states, and then the resistance values ​​of the first detection resistor R+ and the second detection resistor R- can be derived to achieve insulation detection, with a simple and stable structure and low cost. At the same time, in addition to the output side positive and negative insulation detection function, it also has the positive bus switch K1 and the negative bus switch K2 fault diagnosis, the output side short circuit detection of the positive bus 60 and the negative bus 70, and the functions are complete.

[0116] In the present application, the use scenarios of the charging pile 200 and the charging station 300 are not limited. For example, the charging pile 200 and the charging station 300 can be applied to vehicle charging.

[0117] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0119] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A charging pile insulation detection device, characterized in that: include: A first resistor, a second resistor, a third resistor, a first detection resistor and a second detection resistor, and a positive bus switch and a negative bus switch, wherein the first resistor and the third resistor are connected in series between the positive bus and the negative bus to form a first branch, the first detection resistor and the second detection resistor are connected in series between the positive bus and the negative bus to form a second branch, and the first branch and the second branch are connected in parallel; The second resistor is connected in parallel with the second detection resistor and the third resistor respectively, the first end of the second resistor is connected to the first branch and the second branch respectively, and the second end of the second resistor is connected to the negative bus; The positive bus switch is arranged on the positive bus, and the negative bus switch is arranged on the negative bus.

2. The charging pile insulation detection device according to claim 1, characterized in that: The positive bus switch is arranged between the first branch and the second branch, a first end of the positive bus switch is connected to a first end of the first resistor, and a second end of the positive bus switch is connected to a first end of the first detection resistor; The negative bus switch is arranged between the first branch and the second branch, the first end of the negative bus switch is connected to the second end of the third resistor, and the second end of the negative bus switch is connected to the second end of the second detection resistor.

3. The charging pile insulation detection device according to claim 2, characterized in that: The distance from the position where the second resistor is connected to the negative bus bar to the negative bus bar switch is greater than the distance from the position where the second detection resistor is connected to the negative bus bar to the negative bus bar switch.

4. The charging pile insulation detection device according to claim 3, characterized in that: The charging pile insulation detection device also includes a shunt, which is arranged on the negative bus bar, and the second end of the second resistor is connected to the shunt.

5. The charging pile insulation detection device according to claim 1, characterized in that: The charging pile insulation detection device also includes a first switch, a second switch and a third switch, the first switch and the third switch are connected in series between the second end of the first resistor and the first end of the third resistor, the first end of the second switch is connected between the second end of the first detection resistor and the first end of the second detection resistor, and the second end of the second switch is connected to the first end of the second resistor.

6. The charging pile insulation detection device according to claim 5, characterized in that: The charging pile insulation detection device also includes a first sampling resistor and a second sampling resistor, wherein the first end of the first sampling resistor is connected to the second end of the first resistor, the second end of the first sampling resistor is connected to the first switch, the first end of the second sampling resistor is connected to the second switch, and the second end of the second sampling resistor is connected to the first end of the second resistor.

7. The charging pile insulation detection device according to claim 6, characterized in that: The charging pile insulation detection device also includes a third branch and a fourth branch, the first end of the third branch is connected to the first branch and is arranged between the first switch and the third switch, the second end of the third branch is connected to the first end of the second sampling resistor, the first end of the fourth branch is connected to the second branch and is arranged between the first detection resistor and the second detection resistor, and the second end of the fourth branch is connected to the first end of the second sampling resistor.

8. The charging pile insulation detection device according to claim 7, characterized in that: The charging pile insulation detection device also includes a fifth branch, a first end of the fifth branch is connected to the fourth branch and is arranged between the second switch and the second branch, and a second end of the fifth branch is grounded.

9. The charging pile insulation detection device according to claim 5, characterized in that: The first switch, the second switch and the third switch are all electronic switches.

10. A charging pile, characterized in that: The invention comprises the charging pile insulation detection device according to any one of claims 1 to 9.

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