CN109664841B - High-voltage interlocking circuit, fault detection method and device - Google Patents
High-voltage interlocking circuit, fault detection method and device Download PDFInfo
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- CN109664841B CN109664841B CN201811488118.8A CN201811488118A CN109664841B CN 109664841 B CN109664841 B CN 109664841B CN 201811488118 A CN201811488118 A CN 201811488118A CN 109664841 B CN109664841 B CN 109664841B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a high-voltage interlocking circuit, a fault detection method and a fault detection device, wherein the high-voltage interlocking circuit comprises: the detection device comprises a detection branch circuit, a first resistance network, a second resistance network and a constant current source; the detection branch comprises a third resistor network and a high-voltage interface which are connected in series; after being connected in parallel with the first resistance network, the detection branch circuit and the second resistance network are connected in series between the positive output end and the negative output end of the constant current source, so that the first detection module can judge the fault of the high-voltage interface loop according to the voltage of the positive output end of the constant current source, judge the fault of the high-voltage interface loop according to the voltage of the positive output end, and detect the integrity of the high-voltage interface loop.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a high-voltage interlocking circuit, a fault detection method and a fault detection device.
Background
High Voltage Inter-lock (HVIL), is a safety design method that monitors the integrity of the High Voltage interface loop with low Voltage signals. At present, when the integrity of a high-voltage interface circuit is detected, a Micro Controller Unit (MCU) is usually used to output a Pulse-Width Modulation (PWM) wave for detection.
In the existing high-voltage interlocking loop, the MCU outputs PWM waves to one end of the high-voltage interface, when the high-voltage connector is normally connected to the high-voltage interface, the MCU can receive the returned PWM waves at the other end of the high-voltage interface, and the loop of the high-voltage interface is complete. Once the MCU does not receive the returned PWM wave, the fault of the high-voltage interface loop can be determined, and therefore the integrity of the high-voltage interface loop can be detected.
However, the existing technical solution can only determine whether the high-voltage interface circuit is on or off, and cannot determine the specific fault form of the high-voltage interface circuit, which is not beneficial to the subsequent troubleshooting and processing of the fault of the high-voltage interface circuit.
Disclosure of Invention
In order to solve the prior art, embodiments of the present application provide a high-voltage interlock circuit, a fault detection method, and a device, which can identify a specific fault problem of a high-voltage interface loop, distinguish a short circuit of the high-voltage interface loop, a short circuit to ground, or a short circuit to a power supply, and improve fault removal efficiency.
The embodiment of the application provides a high-voltage interlock circuit, includes: the detection device comprises a detection branch circuit, a first resistance network, a second resistance network and a constant current source;
the detection branch comprises a third resistor network and a high-voltage interface which are connected in series;
after being connected in parallel with the first resistance network, the detection branch circuit and the second resistance network are connected in series between the positive output end and the negative output end of the constant current source, so that the first detection module can judge the fault of the high-voltage interface loop according to the voltage of the positive output end of the constant current source.
Optionally, the second resistor network includes a first resistor and a second resistor connected in series, so that the second detection module determines the working state of the constant current source according to the voltage of a node between the first resistor and the second resistor.
Optionally, the first resistance network includes: a third resistor; the third resistive network, comprising: a fourth resistor;
the first end of the third resistor is connected with the positive output end of the constant current source, and the second end of the third resistor is connected with the first end of the first resistor;
the second end of the first resistor is connected with a second detection module and is connected with the negative output end of the constant current source through the second resistor, so that the second detection module judges the working state of the constant current source according to the voltage of a node between the first resistor and the second resistor;
the first end of the fourth resistor is connected with the positive output end of the constant current source through the high-voltage interface, and the second end of the fourth resistor is connected with the first end of the first resistor.
Optionally, the output current of the positive output end of the constant current source is greater than 10 milliamperes, and the negative output end of the constant current source is grounded;
the resistance values of the first resistor and the second resistor are both 100 ohms, and the resistance values of the third resistor and the fourth resistor are both 330 ohms.
Optionally, the method further includes: a voltage dividing branch;
the voltage dividing branch is used for dividing the voltage of the positive output end of the constant current source to obtain a detection voltage, so that the first detection module can judge the fault of the high-voltage interface loop according to the detection voltage.
Optionally, the voltage dividing circuit specifically includes: a fifth resistor and a sixth resistor;
the first end of the fifth resistor is connected with the positive output end of the constant current source;
and the second end of the fifth resistor is connected with the first detection module and is connected with the negative output end of the constant current source through the sixth resistor.
Optionally, a voltage value of the detection voltage does not exceed 5V.
Optionally, the method further includes: a diode and/or a capacitor;
the anode of the diode is connected with the positive output end of the constant current source, and the cathode of the diode is connected with the detection branch circuit;
the first end of the capacitor is connected between the high-voltage interface and the third resistor, and the second end of the capacitor is connected with the negative output end of the constant current source.
The fault detection method provided by the embodiment of the application is applied to any one of the high-voltage interlocking circuits provided by the embodiment; the method comprises the following steps:
obtaining the voltage of the positive output end of the constant current source to obtain a sampling voltage;
determining a voltage interval of the sampling voltage in a configuration table obtained in advance; the configuration table comprises a one-to-one correspondence relationship between a plurality of voltage intervals and the connection state of a high-voltage interface loop, and each voltage interval is not overlapped;
and judging the fault of the high-voltage interface loop according to the connection state of the high-voltage interface loop corresponding to the determined voltage interval.
The fault detection device provided by the embodiment of the application is applied to any one of the high-voltage interlocking circuits provided by the embodiment; the apparatus, comprising: the device comprises a data acquisition unit, an interval searching unit and a fault judging unit;
the data acquisition unit is used for acquiring the voltage of the positive output end of the constant current source to obtain a sampling voltage;
the interval searching unit is used for determining a voltage interval of the sampling voltage in a configuration table obtained in advance; the configuration table comprises a one-to-one correspondence relationship between a plurality of voltage intervals and the connection state of a high-voltage interface loop, and each voltage interval is not overlapped;
and the fault judging unit is used for judging the fault of the high-voltage interface loop according to the connection state of the high-voltage interface loop corresponding to the determined voltage interval.
Compared with the prior art, the method has the advantages that:
in the embodiment of the application, after the high-voltage interface is connected in series with the third resistor network to obtain the detection branch, the detection branch is connected in parallel with the first resistor network, and then connected in series with the second resistor network between the positive output end and the negative output end of the constant current source, and as the connection state of the high-voltage interface changes, such as normal connection, open circuit to ground, short circuit to an external power supply, and the like, the voltage at the positive output end of the constant current source also changes, so that the fault of the high-voltage interface loop can be judged according to the voltage at the positive output end, and the detection of the integrity of the high-voltage interface loop.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a high-voltage interlock circuit according to an embodiment of the present disclosure;
FIG. 2 is a circuit topology of a high voltage interlock circuit according to an embodiment of the present application;
FIG. 3 is another circuit topology of a high voltage interlock circuit according to an embodiment of the present application
Fig. 4a to fig. 4e are schematic diagrams of a high-voltage interlock circuit provided in an embodiment of the present application under different connection states of a high-voltage interface;
FIG. 5 is a circuit topology of yet another high voltage interlock circuit provided in an exemplary embodiment of the present application;
fig. 6 is a schematic flowchart of a fault detection method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a fault detection apparatus according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It should be noted that the high-voltage interlock circuit and the fault detection method and device thereof provided in the embodiments of the present application may be used for detecting a connection state (i.e., integrity of a high-voltage interface circuit) at a high-voltage interface in a vehicle that provides power through a power battery, such as a hybrid vehicle and an electric vehicle, and may also be used for detecting a connection state at a high-voltage interface in a high-voltage interface circuit of other equipment.
In order to detect the connection state of the high-voltage interface and identify the fault of the high-voltage interface loop, the high-voltage interlock circuit provided by the embodiment of the application is connected through a specific resistance network, so that the voltage ranges of the positive output ends of the constant current sources are different when the connection states of the high-voltage interface are different, and the detection of the states of normal connection, open circuit, short circuit to the ground, short circuit to an external power supply and the like of the high-voltage interface can be realized according to the detected voltage of the positive output end of the constant current source.
Based on the above-mentioned ideas, in order to make the above-mentioned objects, features and advantages of the present application more comprehensible, specific embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the diagram is a schematic structural diagram of a high-voltage interlock circuit according to an embodiment of the present disclosure.
The high-voltage interlock circuit that this application embodiment provided includes: a detection branch 100, a first resistance network 200, a second resistance network 300 and a constant current source 400;
the detection branch 100 comprises a third resistor network 500 and a high-voltage interface 600 which are connected in series;
after being connected in parallel with the first resistance network 200, the detection branch 100 is connected in series with the second resistance network 300 between the positive output end and the negative output end of the constant current source 400, so that the first detection module 701 can determine the connection state of the high-voltage interface loop according to the voltage at the positive output end of the constant current source 400.
It is understood that the positive output terminal of the constant current source 400 is an output terminal of a positive voltage or a positive current, and the negative output terminal may be an output terminal of a negative voltage or a reverse current or ground.
In this embodiment, the high-voltage interface 600 is used to connect a high-voltage connector, and the high-voltage connector is connected to the electrical equipment through a wire to form a high-voltage interface loop, so as to supply power to the electrical equipment. In the using process, under the influence of the external or the device itself, the high voltage interface 600 may have connection states such as normal connection, open circuit, short circuit to ground, short circuit to power supply, etc., which results in the resistance and/or voltage of the high voltage interface 600 changing, and the voltage detected at the positive output end of the constant current source 400 also changing accordingly, so as to determine the fault of the high voltage interface loop.
Specifically, when the high-voltage interface circuit is normal, the resistance of the high-voltage interface 600 is equal to the equivalent resistance of the high-voltage connector connection circuit, and the resistance value of the detection branch 100 is the sum of the resistance value of the third resistance network 500 and the equivalent resistance of the high-voltage interface circuit. When the high-voltage interface circuit is in an open circuit state, the connection at the high-voltage interface 600 is disconnected, and the resistance value of the detection branch 100 is infinite. When the high voltage interface loop is short-circuited to ground, the high voltage interface 600 is equivalent to ground, the resistance is zero, the resistance of the detection branch 100 is equal to the resistance of the third resistance network 500, and the connection relationship changes, the detection branch 100 is connected in parallel with the second resistance network 300, and is connected in series with the first resistance network 200 between the positive output end and the negative output end of the constant current source 400. When the high voltage interface loop is short-circuited to an external power source (e.g., an external battery), the high voltage interface 600 is connected to the positive electrode of the external power source, which is equivalent to adding a constant voltage source to the positive output terminal of the constant current source 400. The detection branch 100 is connected with an external power supply, the resistance value is the sum of the resistance value of the third resistance network 500 and the equivalent resistance of the high-voltage interface loop, and the voltage at the positive output end of the constant current source 400 is approximately equal to the voltage of the external power supply.
Therefore, the voltage at the positive output end of the constant current source 400 can be in different voltage intervals in different states of the high-voltage interface circuit by detecting the change of the resistance and/or the voltage of the branch circuit 100 in different connection states, so that the first detection module 701 can judge the fault of the high-voltage interface circuit according to the voltage at the positive output end of the constant current source 400, and the normal work and operation of the electric vehicle are ensured. The following detailed description will be given with reference to specific embodiments, which are not repeated herein. In practical applications, the first detecting module 701 may be an MCU of an electric vehicle.
In the embodiment of the application, after the high-voltage interface is connected in series with the third resistor network to obtain the detection branch, the detection branch is connected in parallel with the first resistor network, and then connected in series with the second resistor network between the positive output end and the negative output end of the constant current source, and as the connection state of the high-voltage interface changes, such as normal connection, open circuit to ground, short circuit to an external power supply, and the like, the voltage at the positive output end of the constant current source also changes, so that the fault of the high-voltage interface loop can be judged according to the voltage at the positive output end, and the detection of the integrity of the high-voltage interface loop.
The high-voltage interlock circuit and the operation principle thereof provided by the embodiments of the present application will be described in detail with a specific example.
Referring to fig. 2, a circuit topology of a high voltage interlock circuit is provided according to an embodiment of the present application.
In some possible implementation manners of the embodiment of the present application, the first resistance network 200 may specifically include: a third resistor R3; the second resistor network 300 may specifically include: a seventh resistor R7; the third resistor network 500 may specifically include: a fourth resistor R4;
the first end of the third resistor R3 is connected with the positive output end of the constant current source 400, and the second end of the third resistor R3 is grounded through the seventh resistor R7;
a first end of the fourth resistor R4 is connected to the positive output terminal of the constant current source 400 via the high voltage interface 600, and a second end of the fourth resistor R4 is connected to the second end of the third resistor R3.
In some possible implementations provided by the embodiment of the present application, as shown in fig. 3, the second resistor network 300 may further include a first resistor R1 and a second resistor R2 connected in series, so that the second detection module 702 may determine the operating state of the constant current source 400 according to the voltage at the node between the first resistor R1 and the second resistor R2. As an example, the first resistor R1 and the second resistor R2 may each have a resistance of 100 ohms.
It can be understood that, because the voltage at the node between the first resistor R1 and the second resistor R2 is not affected by the connection state of the high-voltage interface loop, the current flowing through the branch where the first resistor R1 and the second resistor R2 are located will also change with the change of the current output by the constant current source 400, so that the condition of the current output by the constant current source 400 can be detected according to the voltage at the node between the first resistor R1 and the second resistor R2, and whether the constant current source 400 is working normally is determined, and the accuracy of determining the fault of the high-voltage interface loop can be ensured.
In some possible designs, in order to protect the device safety, the high-voltage interlock circuit provided by the embodiment of the present application may further include: a diode D and/or a capacitor C;
the anode of the diode D is connected to the positive output terminal of the constant current source 400, and the cathode is connected to the first end of the fourth resistor R4 through the high voltage interface 600;
the capacitor C is connected between the first terminal of the fourth resistor R4 and the negative output terminal of the constant current source 400.
The operation principle of the high-voltage interlock circuit provided in the embodiment of the present application is described below by taking the circuit topology shown in fig. 2 as an example.
When the high-voltage interface circuit is in a normal connection state, as shown in fig. 4a, the circuit is normally connected, the high-voltage interface 600 is equivalent to the equivalent resistor R8 connected with the high-voltage interface circuit, and the detection branch 100 includes an equivalent resistor R8 and a fourth resistor R4 connected in series. A part of the current output from the constant current source 400 flows through the series equivalent resistor R8 and the fourth resistor R4, then flows in parallel with the third resistor R3, and finally flows into the ground through the seventh resistor R7.
When the high voltage interface circuit is in an open circuit state, as shown in fig. 4b, the high voltage interface 600 is disconnected, the resistance of the detection branch 100 is infinite, and the current output by the constant current source 400 directly flows into the ground through the third resistor R3 and the seventh resistor R7.
When the high voltage interface loop is short-circuited to ground, as shown in fig. 4c, the high voltage interface 600 is grounded, and after the current output by the constant current source 400 passes through the third resistor R3, a part of the current flows into ground through the fourth resistor R4, and another part of the current flows into ground through the seventh resistor R7.
When the high voltage interface loop is in short circuit with the external power supply, the high voltage interface 600 is connected to the positive electrode of the external power supply, which is equivalent to the external power supply connected to the detection branch 100, and the voltage at the positive output end of the constant current source 400 is approximately equal to the voltage of the external power supply. According to the connection situation, the output of the external power source flows into the ground through the fourth resistor R4 and the seventh resistor R7 which are connected in series, as shown in FIG. 4 d; alternatively, the output of the external power source flows into ground through the equivalent resistor R8, the fourth resistor R4 and the seventh resistor R7 connected in series, as shown in fig. 4 e. And the current outputted from the constant current source 400 flows directly into the ground through the third resistor R3 and the seventh resistor R7.
As can be seen from the above analysis, when the high-voltage interface circuit is in different connection states, the resistance value between the positive output terminal and the negative output terminal of the constant current source 400 is different. Because the current output by the constant current source 400 is constant, the voltage value of the positive output end of the constant current source 400 changes along with the change of the resistance value between the positive output end and the negative output end of the constant current source 400, so that different connection states of normal connection, disconnection, short circuit to the ground, short circuit to the power supply and the like of a high-voltage interface loop can be distinguished.
It should be noted that, in practical applications, the equivalent resistance of the high-voltage interface circuit is affected by the use conditions such as oxidation of the conducting wire, and the resistance value of the high-voltage interface circuit can reach 1000 Ω at most. In order to ensure that the connection state of the high voltage interface 600 can be distinguished according to the detected voltage, in one example, the output current of the constant current source 400 may be greater than 10 milliamperes (mA), such as 12.5mA, 15mA, and the like, the resistance value of the seventh resistor R7 may be 200 ohms, and the resistance values of the third resistor R3 and the fourth resistor R4 may be 330 ohms.
In some possible implementations provided by the embodiments of the present application, as shown in fig. 5, in order to prevent the first detection module 701 from being damaged due to the voltage detected at the positive output terminal of the constant current source 400, the high voltage interlock circuit may further include: a voltage dividing branch 800;
the voltage dividing branch 800 is configured to divide the voltage at the positive output end of the constant current source 400 to obtain a detection voltage, so that the first detection module 701 determines the connection state of the high voltage interface 600 according to the detection voltage.
In practical applications, the voltage value of the obtained detection voltage may be limited to not exceed 5V to avoid the first detection module 701 from being damaged.
As an example, the voltage divider circuit 800 may specifically include: a fifth resistor R5 and a sixth resistor R6;
a first end of the fifth resistor R5 is connected to the positive output end of the constant current source 400;
the second end of the fifth resistor R5 is connected to the first detecting module 701, and is connected to the negative output terminal of the constant current source 400 through the sixth resistor R6.
In practical applications, the resistance of the fifth resistor R5 may be 180 kohms, and the resistance of the sixth resistor R6 may be 100 kohms.
It should be noted that the above is only an exemplary illustration and should not be considered as a limitation to the implementation of the present application, and in practical applications, the magnitude of the current output by the constant voltage source and the resistance values of the resistors may be specifically set according to different application scenarios and different high voltage interface loops, which are not listed here.
Based on the high-voltage interlock circuit provided by the embodiment, the embodiment of the application also provides a fault detection method.
The fault detection method provided by the embodiment of the present application is applied to any one of the high-voltage interlock circuits provided by the above embodiments, and may be specifically executed by an MCU or other controllers of an electric vehicle, which is not limited herein.
Referring to fig. 6, the figure is a schematic flow chart of a fault detection method provided in the embodiment of the present application.
The fault detection method provided by the embodiment of the application comprises the following steps:
s601: obtaining the voltage of the positive output end of the constant current source to obtain a sampling voltage;
s602: determining a voltage interval of sampling voltage in a configuration table obtained in advance; the configuration table comprises a one-to-one corresponding relation between a plurality of voltage intervals and the connection state of the high-voltage interface, and each voltage interval is not overlapped;
taking the circuit topology shown in fig. 5 as an example, wherein the resistances of the third resistor R3 and the fourth resistor R4 are both 300 ohms, the resistance of the seventh resistor R7 is 200 ohms, the resistance of the fifth resistor R5 is 180 kiloohms, and the resistance of the sixth resistor R6 is 100 kiloohms, the configuration table obtained in advance may be as shown in the following table:
| connection state of high-voltage interface loop | Voltage interval |
| Normal connection | (-∞，1.85V) |
| Disconnection of connection | [1.85V，2.7V) |
| Short circuit to ground | [2.7V，3V) |
| Short-circuiting to an external power supply | [3V，4.7V) |
S603: and judging the fault of the high-voltage interface loop according to the connection state of the high-voltage interface loop corresponding to the determined voltage interval.
Based on the high-voltage interlock circuit and the fault detection method provided by the embodiment, the embodiment of the application also provides a fault detection device.
The fault detection device provided in the embodiment of the present application is applied to any one of the high-voltage interlock circuits provided in the above embodiments, and may be specifically configured to be executed by an MCU or other controllers of an electric vehicle, which is not limited herein.
Referring to fig. 7, the diagram is a schematic structural diagram of a fault detection apparatus provided in an embodiment of the present application.
The fault detection device that this application embodiment provided includes: a data acquisition unit 10, an interval search unit 20, and a failure determination unit 30;
the data acquisition unit 10 is used for acquiring the voltage of the positive output end of the constant current source to obtain a sampling voltage;
an interval searching unit 20, configured to determine a voltage interval of the sampling voltage in a configuration table obtained in advance; the configuration table comprises a one-to-one corresponding relation between a plurality of voltage intervals and the connection state of the high-voltage interface loop, and each voltage interval is not overlapped;
and a fault determining unit 30, configured to determine a fault of the high-voltage interface circuit according to the connection state of the high-voltage interface circuit corresponding to the determined voltage interval.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The system or the device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (9)
1. A high voltage interlock circuit, comprising: the detection device comprises a detection branch circuit, a first resistance network, a second resistance network and a constant current source;
the detection branch comprises a third resistor network and a high-voltage interface which are connected in series;
after being connected in parallel with the first resistance network, the detection branch circuit is connected in series with the second resistance network between the positive output end and the negative output end of the constant current source, so that the first detection module can judge the fault of the high-voltage interface loop according to the voltage range of the voltage of the positive output end of the constant current source; the second resistor network comprises a first resistor and a second resistor which are connected in series, so that the second detection module can judge the working state of the constant current source according to the voltage of a node between the first resistor and the second resistor.
2. The high voltage interlock circuit of claim 1, wherein said first resistor network comprises: a third resistor; the third resistive network, comprising: a fourth resistor;
the first end of the third resistor is connected with the positive output end of the constant current source, and the second end of the third resistor is connected with the first end of the first resistor;
the second end of the first resistor is connected with a second detection module and is connected with the negative output end of the constant current source through the second resistor, so that the second detection module judges the working state of the constant current source according to the voltage of a node between the first resistor and the second resistor;
the first end of the fourth resistor is connected with the positive output end of the constant current source through the high-voltage interface, and the second end of the fourth resistor is connected with the first end of the first resistor.
3. The high voltage interlock circuit of claim 2,
the output current of the positive output end of the constant current source is more than 10 milliamperes, and the negative output end of the constant current source is grounded;
the resistance values of the first resistor and the second resistor are both 100 ohms, and the resistance values of the third resistor and the fourth resistor are both 330 ohms.
4. The high voltage interlock circuit of any of claims 1-3, further comprising: a voltage dividing branch;
the voltage dividing branch is used for dividing the voltage of the positive output end of the constant current source to obtain a detection voltage, so that the first detection module can judge the fault of the high-voltage interface loop according to the detection voltage.
5. The high-voltage interlock circuit according to claim 4, wherein the voltage divider circuit comprises: a fifth resistor and a sixth resistor;
the first end of the fifth resistor is connected with the positive output end of the constant current source;
and the second end of the fifth resistor is connected with the first detection module and is connected with the negative output end of the constant current source through the sixth resistor.
6. The high voltage interlock circuit of claim 4,
the voltage value of the detection voltage does not exceed 5V.
7. The high voltage interlock circuit of any of claims 1-3, further comprising: a diode and/or a capacitor;
the anode of the diode is connected with the positive output end of the constant current source, and the cathode of the diode is connected with the detection branch circuit;
the first end of the capacitor is connected between the high-voltage interface and the third resistor, and the second end of the capacitor is connected with the negative output end of the constant current source.
8. A fault detection method, applied to the high-voltage interlock circuit according to any one of claims 1 to 7; the method comprises the following steps:
obtaining the voltage of the positive output end of the constant current source to obtain a sampling voltage;
determining a voltage interval of the sampling voltage in a configuration table obtained in advance; the configuration table comprises a one-to-one correspondence relationship between a plurality of voltage intervals and the connection state of a high-voltage interface loop, and each voltage interval is not overlapped;
judging the fault of the high-voltage interface loop according to the connection state of the high-voltage interface loop corresponding to the determined voltage interval; the second resistor network comprises a first resistor and a second resistor which are connected in series, so that the second detection module can judge the working state of the constant current source according to the voltage of a node between the first resistor and the second resistor.
9. A fault detection device, applied to a high-voltage interlock circuit according to any one of claims 1 to 7; the apparatus, comprising: the device comprises a data acquisition unit, an interval searching unit and a fault judging unit;
the data acquisition unit is used for acquiring the voltage of the positive output end of the constant current source to obtain a sampling voltage;
the interval searching unit is used for determining a voltage interval of the sampling voltage in a configuration table obtained in advance; the configuration table comprises a one-to-one correspondence relationship between a plurality of voltage intervals and the connection state of a high-voltage interface loop, and each voltage interval is not overlapped;
the fault judgment unit is used for judging the fault of the high-voltage interface loop according to the connection state of the high-voltage interface loop corresponding to the determined voltage interval; the second resistor network comprises a first resistor and a second resistor which are connected in series, so that the second detection module can judge the working state of the constant current source according to the voltage of a node between the first resistor and the second resistor.
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| SE2251267A1 (en) * | 2022-10-31 | 2024-05-01 | Northvolt Systems Ab | Connector interface |
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| CN111983391B (en) * | 2019-05-21 | 2023-06-20 | 上海汽车集团股份有限公司 | Fault positioning method and system |
| CN112213573B (en) * | 2019-12-30 | 2023-06-23 | 蜂巢能源科技有限公司 | High-voltage interlocking loop detection method and circuit |
| CN113777521B (en) * | 2020-05-22 | 2023-05-09 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| CN113866668B (en) * | 2020-06-12 | 2023-04-14 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| CN111796213B (en) * | 2020-07-10 | 2023-05-12 | 的卢技术有限公司 | Detection circuit and method for electrical loop integrity and breakpoint positioning |
| CN112882456B (en) * | 2021-01-13 | 2022-04-12 | 深圳市道通科技股份有限公司 | OBD equipment |
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| CN113552472B (en) * | 2021-09-18 | 2021-12-24 | 浙江富特科技股份有限公司 | High-voltage interlocking detection circuit and method for detecting interlocking loop state by using same |
| CN113917368A (en) * | 2021-09-28 | 2022-01-11 | 潍柴动力股份有限公司 | High-voltage interlocking detection circuit, method and device |
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