CN214310793U - Relay state diagnostic circuit - Google Patents
Relay state diagnostic circuit Download PDFInfo
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- CN214310793U CN214310793U CN202022710063.XU CN202022710063U CN214310793U CN 214310793 U CN214310793 U CN 214310793U CN 202022710063 U CN202022710063 U CN 202022710063U CN 214310793 U CN214310793 U CN 214310793U
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Abstract
The utility model provides a relay state diagnostic circuit belongs to relay state diagnosis technical field. The diagnostic circuit includes: the device comprises a first branch circuit, a second branch circuit and a signal acquisition processing part; the first branch circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor which are sequentially connected in series; one end of the first branch is used for connecting the anode of the vehicle high-voltage loop, and the other end of the first branch is used for connecting the cathode of the vehicle high-voltage loop; the second branch comprises an auxiliary power supply, one end of the second branch where the anode of the auxiliary power supply is located is connected with a series point of a second resistor and a third resistor, and the other end of the second branch is used for being connected with the cathode of the battery pack; the series connection point of the first resistor and the second resistor is a first voltage sampling point, and the series connection point of the third resistor and the fourth resistor is a second voltage sampling point; the first voltage sampling point and the second voltage sampling point are respectively connected with the signal acquisition processing part. The diagnostic circuit can be used for simultaneously diagnosing the states of the positive relay and the negative relay, the diagnostic efficiency is high, and the cost of the diagnostic circuit is low.
Description
Technical Field
The utility model relates to a relay state diagnostic circuit belongs to relay state diagnosis technical field.
Background
At present, the safety of the electric automobile is more and more emphasized, and an important factor influencing the safety of the electric automobile is the adhesion problem of the high-voltage relay. In the application of a high-voltage electrical system, in order to control the on-off of the high-voltage electrical system and ensure the safety of a high-voltage loop, a relay needs to be introduced to control the on-off of the loop. The relay is located in the high voltage main circuit between the battery pack and any protected device. In actual electric automobile application, when an expected electric system does not work, the high voltage of the battery pack is automatically disconnected with other rear-end load devices, when the relay has the problem of adhesion failure, the expected requirement cannot be met, the adhesion failure of the relay directly causes the situations of overshoot, overdischarge and the like of the battery pack, the performance of a battery is attenuated if the battery is in a light situation, and serious safety accidents such as fire explosion and the like of the battery pack can be caused if the battery is in a serious situation, so that whether the on-off state of the relay meets the expected requirement or not directly influences the safety of the whole high-voltage electric system, and in the static and running processes of a vehicle, the on-off state of the relay needs to be diagnosed to ensure that the state of the relay is consistent with the actual requirement.
For example, in the invention patent application with the application number of CN109143048A, a high-voltage loop relay adhesion diagnosis circuit and a diagnosis method are disclosed, wherein different detection circuits are required for the state detection of a positive relay and the state detection of a negative relay, which results in a complex relay adhesion diagnosis circuit and high cost; in addition, the state detection of the positive and negative relays needs to be completed in a time-sharing and step-by-step mode and cannot be performed simultaneously, the detection efficiency is low, different detection circuits need to be controlled to be on and off in the detection process, and the detection process is complex.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a relay state diagnostic circuit that can realize just, negative pole relay state diagnosis simultaneously.
In order to achieve the above object, the present invention provides a relay status diagnosis circuit, which is used for status diagnosis of a positive relay and a negative relay in a vehicle high-voltage loop, wherein the vehicle high-voltage loop at least comprises a battery pack, a positive relay connected between the positive pole of the battery pack and the positive pole of the vehicle high-voltage loop, and a negative relay connected between the negative pole of the battery pack and the negative pole of the vehicle high-voltage loop;
the diagnostic circuit includes: the device comprises a first branch circuit, a second branch circuit and a signal acquisition processing part;
the first branch circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor which are sequentially connected in series; one end of the first branch is used for being connected with the anode of a vehicle high-voltage circuit, and the other end of the first branch is used for being connected with the cathode of the vehicle high-voltage circuit;
the second branch comprises an auxiliary power supply, one end of the second branch where the anode of the auxiliary power supply is located is connected with a series point of a second resistor and a third resistor, and one end of the second branch where the cathode of the auxiliary power supply is located is used for being connected with the cathode of the battery pack;
the series connection point of the first resistor and the second resistor is a first voltage sampling point, and the series connection point of the third resistor and the fourth resistor is a second voltage sampling point; the first voltage sampling point and the second voltage sampling point are respectively connected with the signal acquisition processing part.
The utility model has the advantages that: when the relay state diagnosis circuit is used for carrying out state diagnosis on the positive relay and the negative relay in the vehicle high-voltage loop, the state of the positive relay can be judged according to the relation between the voltage value of the first voltage sampling point and the voltage value of the auxiliary power supply and the state of the negative relay can be judged according to the relation between the voltage value of the second voltage sampling point and the voltage value of the auxiliary power supply by acquiring the voltage value of the first voltage sampling point and the voltage value of the second voltage sampling point; because the voltage value of first, second voltage sampling point can gather simultaneously and obtain, consequently utilizes the utility model discloses a relay state diagnostic circuit can realize the state diagnosis of anodal relay and negative pole relay simultaneously, diagnoses efficiently, and need not carry out on-off control to detection circuitry, and the testing process is simple, in addition, because the state diagnosis of anodal relay and negative pole relay shares one set of circuit, diagnostic circuit's cost is lower.
Further, the diagnostic circuit further comprises a first filtering means and a second filtering means; the first voltage sampling point is connected with the signal acquisition and processing part through the first filtering device, and the second voltage sampling point is connected with the signal acquisition and processing part through the second filtering device.
Further, the signal acquisition processing part comprises an ADC conversion circuit.
Drawings
Fig. 1 is a schematic circuit diagram of a relay state diagnosis circuit used for diagnosis of a single positive relay and a single negative relay in embodiment 1 of the present invention;
fig. 2 is a schematic circuit diagram of a positive relay that is adhered when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in embodiment 2 of the relay state diagnosis circuit of the present invention;
fig. 3 is a schematic circuit diagram of a negative relay that is adhered when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in the relay state diagnosis circuit embodiment 2 of the present invention;
fig. 4 is a schematic circuit diagram illustrating adhesion of a positive relay and a negative relay when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in embodiment 2 of the relay state diagnosis circuit of the present invention;
fig. 5 is a schematic circuit diagram of the relay state diagnosis circuit of the present invention, in which two positive relays are simultaneously bonded when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in embodiment 2 of the relay state diagnosis circuit;
fig. 6 is a schematic circuit diagram of the relay state diagnosis circuit of the present invention, in which two negative relays are simultaneously bonded when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in embodiment 2 of the relay state diagnosis circuit;
fig. 7 is a schematic circuit diagram illustrating the adhesion of two positive relays and two negative relays when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in the embodiment 2 of the relay state diagnosis circuit of the present invention;
fig. 8 is a schematic circuit diagram of the relay state diagnosis circuit of the present invention, in which three positive relays are simultaneously bonded when the relay state diagnosis circuit is used for diagnosing three positive relays and three negative relays in embodiment 2 of the relay state diagnosis circuit;
fig. 9 is a schematic circuit diagram of a relay state diagnosis circuit of the present invention, in which three cathode relays are simultaneously bonded when the relay state diagnosis circuit is used for diagnosing three cathode relays and three anode relays in embodiment 2 of the relay state diagnosis circuit;
fig. 10 is a schematic circuit diagram illustrating the three positive relays and the three negative relays are adhered when the relay state diagnosis circuit is used for diagnosing the three positive relays and the three negative relays in the relay state diagnosis circuit embodiment 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Relay state diagnosis circuit embodiment 1:
the relay state diagnosis circuit of the embodiment is used for performing state diagnosis on a positive relay and a negative relay in a high-voltage circuit of a vehicle. The relay state diagnosis circuit of the present embodiment will be described in detail below, taking as an example the state diagnosis of the relay state diagnosis circuit of the present embodiment for a single positive relay and a single negative relay:
as shown in fig. 1, the vehicle high-voltage circuit includes at least a battery pack, a positive relay RelayP connected between a positive electrode of the battery pack and a positive electrode HV + of the vehicle high-voltage circuit, and a negative relay RelayN connected between a negative electrode of the battery pack and a negative electrode HV-of the vehicle high-voltage circuit. The positive relay RelayP is used for controlling the on-off of the positive loop, and the negative relay RelayN is used for controlling the on-off of the negative loop.
As shown in fig. 1, the relay state diagnosis circuit of the present embodiment includes: the device comprises a first branch circuit, a second branch circuit, a first filtering device, a second filtering device and a signal acquisition and processing part; the first branch circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 which are sequentially connected in series; one end of the first branch is used for being connected with a positive electrode HV + of a vehicle high-voltage circuit, and the other end of the first branch is used for being connected with a negative electrode HV-; the second branch circuit comprises an auxiliary power supply, one end of the second branch circuit where the anode of the auxiliary power supply is located is connected with a series point of a second resistor R2 and a third resistor R3, and one end of the second branch circuit where the cathode of the auxiliary power supply is located is used for connecting with the cathode of the battery pack; the series connection point of the first resistor R1 and the second resistor R2 is a first voltage sampling point, and the series connection point of the third resistor R3 and the fourth resistor R4 is a second voltage sampling point; the first voltage sampling point is connected with the signal acquisition and processing part through the first filtering device, and the second voltage sampling point is connected with the signal acquisition and processing part through the second filtering device.
The filtering device is a commonly used filter in the prior art, and has the function of filtering the voltage value acquired by the voltage sampling point, so that the voltage signal acquired by the signal acquisition and processing part is more stable and reliable.
As shown in fig. 1, in the present embodiment, the first resistor R1, the second resistor R2 and the first filter device constitute a positive electrode detection portion for detecting the state of the positive electrode relay and converting the state information of the positive electrode relay into a voltage signal; the third resistor R3, the fourth resistor R4 and the second filter device form a negative pole detection part which is used for detecting the state of the negative pole relay and converting the state information of the negative pole relay into a voltage signal; the signal acquisition processing part comprises an ADC conversion circuit and a processor and is mainly used for converting voltage signal analog quantity corresponding to the state information of the positive and negative relays into voltage values of digital quantity and then carrying out operation processing on the voltage values of the digital quantity to obtain the state information of the positive and negative relays.
The voltage value Vref of the auxiliary power supply, the values of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are determined according to the voltage value of the battery pack; as an embodiment, when the voltage of the battery pack is 200V, the voltage of the auxiliary power supply is 3V, R1 ═ 100K Ω, R2 ═ 1K Ω, R3 ═ 1K Ω, and R4 ═ 100K Ω.
When the battery pack in the vehicle high-voltage circuit works and needs high-voltage output, the anode relay RelayP and the cathode relay RelayN need to be closed simultaneously (namely, are in a connected state simultaneously), and the rear-end high-voltage circuit starts to work; when the battery pack in the vehicle high-voltage loop works but needs to stop high-voltage output or does not work, the anode relay RelayP and the cathode relay RelayN need to be disconnected simultaneously, and the rear-end high-voltage circuit is disconnected from the high voltage to stop working; however, in the actual working process, when the relay needs to be disconnected, the relay may be stuck and cannot be normally disconnected; when the relay needs to be closed, the relay may be stuck and cannot be normally closed.
By connecting the relay state diagnosis circuit of the embodiment to the vehicle high-voltage circuit, the relay state diagnosis circuit of the embodiment can be used for performing state diagnosis on the positive relay and the negative relay in the vehicle high-voltage circuit, and specifically, by collecting the voltage value Vp of the first voltage sampling point and the voltage value Vn of the second voltage sampling point, the states of the positive relay and the negative relay can be judged according to the relationship between the voltage value Vp and the voltage value Vn and the voltage value Vref of the auxiliary power supply.
As can be seen from fig. 1, when the battery pack in the high-voltage circuit of the vehicle is in operation:
when both RelayP and RelayN are in the off state: vp equals Vref, Vn equals Vref;
when RelayP is in the on state and RelayN is in the off state:
Vn＝Vref
in the formula, Vsum is the voltage value from the positive electrode of the battery pack to the negative electrode of the battery pack.
When RelayP is in the off state and RelayN is in the on state:
Vp＝Vref
when both RelayP and RelayN are in the on state:
in summary, a relay state determination table shown in table 1 is obtained:
TABLE 1 Relay State judging Table
After the voltage value Vp is acquired, the state of the anode relay RelayP can be determined by comparing the voltage value Vp with the table 1; after the voltage value Vn is acquired, the state of the negative relay RelayN can be judged by comparing the voltage value Vn with the voltage value Vn shown in the table 1; because the voltage value Vp and the voltage value Vn can be acquired simultaneously, the state diagnosis of the positive relay and the negative relay can be realized simultaneously by utilizing the relay state diagnosis circuit of the embodiment, the diagnosis efficiency is high, and the state diagnosis of the positive relay and the negative relay share one circuit, so the cost is low. In practical application, the relay state diagnosis circuit of the embodiment is used for acquiring the state information of the positive relay and the negative relay in real time, so that the automobile safety can be improved by judging whether the state of the relay is consistent with the actual requirement or not.
Relay state diagnosis circuit embodiment 2:
relay state diagnosis circuit embodiment 1 describes a relay state diagnosis circuit in detail by taking a state diagnosis of a single positive relay and a single negative relay as an example, and the present embodiment is different from embodiment 1 in that: the relay state diagnosis circuit of this embodiment may be used for the state diagnosis of a plurality of positive relays and a plurality of negative relays, and the detailed description will be given below by taking the state diagnosis of three positive relays and three negative relays as an example.
When the relay state diagnosis circuit is used for state diagnosis of three positive pole relays and three negative pole relays, the specific circuit corresponding to each situation is shown in fig. 2-10, in the figure, V1 represents a battery pack, RelayP1, RelayP2 and RelayP3 are three positive pole relays, and RelayN1, RelayN2 and RelayN3 are three negative pole relays, when the relay state diagnosis circuit comprises a branch in which an auxiliary power supply V2 is located and a branch in which resistors R1, R2, R3 and R4 are connected in series, and further comprises a branch in which resistors R7, R6, R5 and R8 are located in series and a branch in which resistors R8, R8 and R8 are located in series, one end of the auxiliary power supply V8 is used for connecting the negative pole of the battery pack V8, the other end of the auxiliary power supply V8 is used for connecting the series point of the resistors R8 and R8, the series point of the positive pole relay 8 and the high-voltage loop of the vehicle, the series point of the relay 8 and the high-voltage relay 8, and the serial point of the resistor and the negative relay is used for connecting the negative pole of the high-voltage loop of the vehicle. The position of the probe in the figure is a voltage sampling point.
FIG. 2 is a schematic circuit diagram showing a positive relay stuck together, FIG. 3 is a schematic circuit diagram showing a negative relay stuck together, FIG. 4 is a schematic circuit diagram showing a positive relay and a negative relay being stuck together, FIG. 5 is a schematic circuit diagram showing two positive relays being stuck together, FIG. 6 is a schematic circuit diagram of two negative electrode relays being adhered at the same time, FIG. 7 is a schematic circuit diagram of two positive electrode relays and two negative electrode relays being adhered, FIG. 8 is a schematic circuit diagram of three positive relays being bonded simultaneously, FIG. 9 is a schematic circuit diagram of three negative relays being bonded simultaneously, FIG. 10 is a schematic circuit diagram of three positive relays and three negative relays being bonded, in each case, the voltage values at the voltage sampling points are as shown in the corresponding diagram, and the state of each relay can be determined by combining the relationship between the voltage values at the voltage sampling points and the voltage value of the auxiliary power supply.
Claims (3)
1. The relay state diagnosis circuit is characterized by being used for performing state diagnosis on a positive relay and a negative relay in a vehicle high-voltage loop, wherein the vehicle high-voltage loop at least comprises a battery pack, the positive relay connected between the positive pole of the battery pack and the positive pole of the vehicle high-voltage loop, and the negative relay connected between the negative pole of the battery pack and the negative pole of the vehicle high-voltage loop;
the diagnostic circuit includes: the device comprises a first branch circuit, a second branch circuit and a signal acquisition processing part;
the first branch circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor which are sequentially connected in series; one end of the first branch is used for being connected with the anode of a vehicle high-voltage circuit, and the other end of the first branch is used for being connected with the cathode of the vehicle high-voltage circuit;
the second branch comprises an auxiliary power supply, one end of the second branch where the anode of the auxiliary power supply is located is connected with a series point of a second resistor and a third resistor, and one end of the second branch where the cathode of the auxiliary power supply is located is used for being connected with the cathode of the battery pack;
the series connection point of the first resistor and the second resistor is a first voltage sampling point, and the series connection point of the third resistor and the fourth resistor is a second voltage sampling point; the first voltage sampling point and the second voltage sampling point are respectively connected with the signal acquisition processing part.
2. The relay status diagnostic circuit of claim 1, further comprising a first filtering device and a second filtering device; the first voltage sampling point is connected with the signal acquisition and processing part through the first filtering device, and the second voltage sampling point is connected with the signal acquisition and processing part through the second filtering device.
3. The relay state diagnostic circuit according to claim 1 or 2, wherein the signal acquisition processing section includes an ADC conversion circuit.
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| CN202022710063.XU CN214310793U (en) | 2020-11-20 | 2020-11-20 | Relay state diagnostic circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019360A (en) * | 2021-10-27 | 2022-02-08 | 智新控制系统有限公司 | Multi-relay diagnostic system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019360A (en) * | 2021-10-27 | 2022-02-08 | 智新控制系统有限公司 | Multi-relay diagnostic system and method |
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Effective date of registration: 20211228 Address after: 450000 room 320, third floor, comprehensive office building, No. 88, Yugong Road, economic and Technological Development Zone, Zhengzhou City, Henan Province Patentee after: Yutong Commercial Vehicle Co.,Ltd. Address before: No.266, Xunjiang East Road, Zhengzhou Economic and Technological Development Zone, Henan 450000 Patentee before: ZHENGZHOU SHENLAN POWER TECHNOLOGY Co.,Ltd. |
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