High-voltage interlocking detection circuit and device

Abstract

The utility model discloses a high-voltage interlocking detection circuit and device, and relates to the technical field of automobile detection.The high-voltage interlocking detection circuit comprises at least two detection modules which are connected in series, each detection module comprises at least two detection units which are connected in parallel, and each detection unit comprises at least two detection resistors which are connected in series; the at least two detection modules are also connected with the corresponding high-voltage connectors in parallel; the voltage acquisition module is connected with any detection module and is used for acquiring endpoint voltage of the detection module and outputting a voltage sampling signal; and the judgment module is connected with the voltage acquisition module and is used for receiving the voltage sampling signal and obtaining the high-voltage interlocking state of each high-voltage connector and the fault state of each detection resistor according to the voltage sampling signal. The high-voltage interlocking detection circuit solves the technical problem that the high-voltage interlocking detection circuit is low in reliability.

Description

Technical Field

[0001] This application relates to the technical field of vehicle detection, and particularly to a high-voltage interlock detection circuit and device. Background Art

[0002] In the related art, a detection resistor with a different resistance value can be connected in parallel to each of the multiple high-voltage connectors of the high-voltage system, and the interlock state of the high-voltage connector corresponding to each detection resistor can be judged by detecting the voltage at the voltage detection point, so as to realize the high-voltage interlock detection function. However, if the detection resistor fails, the high-voltage interlock detection of the corresponding high-voltage connector cannot be realized, resulting in low reliability of the high-voltage interlock detection circuit. Summary of the Utility Model

[0003] The main object of this application is to propose a high-voltage interlock detection circuit and device, aiming to solve the technical problem of low reliability of the high-voltage interlock detection circuit.

[0004] To achieve the above object, the high-voltage interlock detection circuit proposed in this application includes:

[0005] At least two detection modules connected in series, each detection module includes at least two detection units connected in parallel, each detection unit includes at least two detection resistors connected in series, and at least two detection modules are also connected in parallel with their respective corresponding high-voltage connectors;

[0006] A voltage acquisition module, connected to any one of the detection modules, for acquiring the terminal voltage of the detection module and outputting a voltage sampling signal;

[0007] A judgment module, connected to the voltage acquisition module, for receiving the voltage sampling signal and obtaining the high-voltage interlock state of each high-voltage connector and the fault state of each detection resistor according to the voltage sampling signal.

[0008] In one embodiment, the equivalent resistance values of at least two detection modules are different from each other.

[0009] In one embodiment, the voltage acquisition module includes:

[0010] A pull-down resistor unit, connected to the output ends of at least two detection modules, for performing voltage division processing on the voltages of at least two detection modules;

[0011] A signal processing unit, connected to any one of the detection modules, for acquiring the terminal voltage and outputting a voltage sampling signal.

[0012] In one embodiment, the voltage acquisition module further includes:

[0013] A signal source unit, connected to at least two detection modules, for outputting a power signal to at least two detection modules.

[0014] In one embodiment, the voltage acquisition module further includes:

[0015] A pull-up resistor unit, which is respectively connected to the signal source unit and the input ends of at least two detection modules, and is used for dividing the voltage at the input ends of at least two detection modules.

[0016] In one embodiment, the signal processing unit is connected to the common connection point of the pull-up resistor unit and at least two detection modules, or is connected to the common connection point of the pull-down resistor unit and at least two detection modules.

[0017] In one embodiment, both the pull-up resistor unit and the pull-down resistor unit include at least two resistor circuits connected in parallel, and each resistor circuit includes at least two sampling resistors connected in series.

[0018] In one embodiment, the power supply signal is any one of a DC voltage signal, a square wave signal, a triangular wave signal, or an AC voltage signal.

[0019] In one embodiment, the judgment module is a microprogram controller.

[0020] The present application also provides a high-voltage interlock detection device, which includes:

[0021] The high-voltage interlock detection circuit as described above.

[0022] One or more technical solutions provided by the present application have at least the following technical effects:

[0023] In the technical solution of the present application, by setting at least two detection modules connected in series, and setting at least two detection units in the detection modules connected in parallel to each high-voltage connector, and setting at least two detection resistors in each detection unit, when at least one detection resistor in the detection module corresponding to any high-voltage connector fails, since the other detection resistors in the detection module are working normally, the voltage acquisition module can still collect the terminal voltage of any one detection module, so that the judgment module can judge the high-voltage interlock state of each high-voltage connector and the fault state of each detection resistor according to different terminal voltages, improving the reliability of the high-voltage interlock detection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1Schematic diagram of a circuit of an embodiment of the high-voltage interlock detection circuit provided by this application;

[0026] Figure 2 Schematic diagram of a circuit of an exemplary detection module provided by this application;

[0027] Figure 3 Schematic diagram of a circuit of another exemplary detection module provided by this application;

[0028] Figure 4 Schematic diagram of a circuit of yet another exemplary detection module provided by this application.

[0029] The realization of the purpose of this application, functional features, and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of this application will be clearly and completely described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0031] It should be noted that in this utility model, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a device or system including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such device or system. Without more limitations, the elements defined by the statement "include..." do not exclude the existence of additional identical elements in the device or system including such element.

[0032] In this utility model, unless otherwise clearly defined and limited, the terms "connect", "fix", etc. should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] In the present utility model, the use of suffixes such as "module", "component", or "unit" for representing elements is only for facilitating the description of the present utility model, and it has no specific meaning by itself. Therefore, "module", "component", or "unit" can be used interchangeably. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] In an automotive high-voltage system, the interlock state of a high-voltage connector can be detected through a high-voltage interlock detection circuit. However, if the detection resistor itself in the relevant high-voltage interlock detection circuit fails, the high-voltage interlock detection of the corresponding high-voltage connector cannot be achieved. Specifically, after any one of the detection resistors is short-circuited, if the corresponding high-voltage connector is disconnected, it cannot be correctly detected; after any one of the detection resistors is open-circuited, if the corresponding high-voltage connector is disconnected, it is impossible to correctly locate which high-voltage connector is disconnected, resulting in a relatively low reliability of the high-voltage interlock detection circuit.

[0035] To solve the above technical problems, the present application proposes a high-voltage interlock detection circuit and device.

[0036] Please refer to Figures 1 to 4 In an embodiment of the present application, the high-voltage interlock detection circuit may include:

[0037] At least two detection modules connected in series, each detection module includes at least two detection units connected in parallel, each detection unit includes at least two detection resistors connected in series, and the at least two detection modules are also connected in parallel with their respective corresponding high-voltage connectors;

[0038] A voltage acquisition module, connected to any one of the detection modules, for acquiring the terminal voltage of the detection module and outputting a voltage sampling signal;

[0039] A judgment module, connected to the voltage acquisition module, for receiving the voltage sampling signal and obtaining the high-voltage interlock state of each high-voltage connector and the fault state of each detection resistor according to the voltage sampling signal.

[0040] It should be noted that taking the automotive high-voltage system as an example, as Figure 1 shown, n is the number of high-voltage connectors in the automotive high-voltage system, the number of detection modules is the same as the number of high-voltage connectors, one detection module is connected in parallel with one high-voltage connector, j is the number of detection units in one detection module, and i is the number of detection resistors in one detection unit.

[0041] In some examples, asFigure 2 As shown, the detection module x corresponding to the high-voltage connector x may include detection resistors Rx to Rx+3. The detection resistors Rx and Rx+2 are connected in series as one detection unit, and the detection resistors Rx+1 and Rx+3 are connected in series as another detection unit. As Figure 3 As shown, the detection module x corresponding to the high-voltage connector x may include detection resistors Rx to Rx+5. The detection resistors Rx, Rx+2, and Rx+4 are sequentially connected in series as one detection unit, and the detection resistors Rx+1, Rx+3, and Rx+5 are sequentially connected in series as another detection unit. As Figure 4 As shown, the detection module x corresponding to the high-voltage connector x may include detection resistors Rx to Rx+5. The detection resistors Rx and Rx+3 are connected in series as the first detection unit, the detection resistors Rx+1 and Rx+4 are connected in series as the second detection unit, and the detection resistors Rx+2 and Rx+5 are connected in series as the third detection unit. Thus, in specific implementation, the number of detection units and detection resistors in each detection module is set according to actual usage requirements. Preferably, in order to control the cost of the high-voltage interlock detection circuit, as Figure 2 As shown, the detection module is provided with two detection units, and each detection unit is provided with two detection resistors.

[0042] It can be understood that the high-voltage interlock state may include a connected state and a disconnected state. When the high-voltage connector is in the connected state, both ends of the parallel detection modules will be short-circuited, and when the high-voltage connector is in the disconnected state, a voltage can be detected at both ends of the parallel detection modules. Therefore, by collecting the terminal voltage of the detection module through the voltage acquisition module, according to the change of the terminal voltage, the high-voltage interlock state of each high-voltage connector can be detected, and in the case of a fault in the detection resistor, the terminal voltage will also change. Therefore, the fault state of each detection resistor can also be determined according to the change of the terminal voltage. As Figure 1 As shown, the voltage acquisition points for collecting the terminal voltage may be set at the input or output ends of at least two detection modules, or at the common connection point Px of any two detection modules.

[0043] In this embodiment, after the voltage acquisition module acquires the voltage sampling signal, it can output the voltage sampling signal to the judgment module, so that the judgment module can compare the voltage value corresponding to the voltage sampling signal with multiple preset voltage values to detect the high-voltage interlock state of each high-voltage connector and the fault state of each detection resistor.

[0044] It can be understood that the judgment module may be a controller. The controller may include a logic controller and a microprogram controller. The logic circuit in the logic controller can be set according to multiple preset voltage values, and the microprogram controller can store multiple preset voltage values. Among them, when the positions of the voltage acquisition points are different, the multiple preset voltage values are also different. In specific implementation, the multiple preset voltage values can be determined according to the equivalent resistance values of each detection module.

[0045] In a feasible implementation, the equivalent resistance values of at least two detection modules are different from each other.

[0046] It should be noted that the equivalent resistance values of at least two detection modules may be the same. In this case, it is possible to determine whether a high-voltage connector is in an open state based on the voltage sampling signal, and determine how many high-voltage connectors are in an open state; or, the equivalent resistance values of at least two detection modules may be different from each other. In this case, when different high-voltage connectors are in an open state, the terminal voltages are all different. Therefore, it is also possible to locate the high-voltage connector in an open state based on the voltage sampling signal. Preferably, in this embodiment, the equivalent resistance values of at least two detection modules are set to be different from each other.

[0047] It can be understood that the resistance values of the detection resistors in one detection module may be the same, as long as it is ensured that the equivalent resistance values of at least two detection modules are different from each other. The resistance values of the detection resistors in one detection module may also be different. In this case, if a detection resistor fails, it is also possible to locate the faulty detection resistor based on the voltage sampling signal.

[0048] In a feasible implementation, the judgment module may be a microprogram controller.

[0049] It should be noted that in order to simplify the judgment module, in this embodiment, a microprogram controller is selected as the judgment module.

[0050] In a feasible implementation, the voltage acquisition module may include:

[0051] A pull-down resistor unit, connected to the output ends of at least two detection modules, for performing voltage division processing on the voltages of at least two detection modules;

[0052] A signal processing unit, connected to any one of the detection modules, for collecting the terminal voltage and outputting a voltage sampling signal.

[0053] In this embodiment, the voltage acquisition module further includes:

[0054] A signal source unit, connected to at least two detection modules, for outputting a power signal to at least two detection modules.

[0055] It should be noted that the signal source unit is connected to the input ends of at least two detection modules connected in series, and the pull-down resistor unit may be connected to the output ends of at least two detection modules connected in series. The power signal output by the signal source unit passes through at least two detection modules or at least two high-voltage connectors and is output to the pull-down resistor unit, so that there is a terminal voltage at the terminals of the detection modules. After the signal processing unit collects the terminal voltage, a voltage sampling signal is obtained. Among them, the signal processing unit may be a signal conditioning circuit.

[0056] In this embodiment, the power supply signal can be any one of a DC voltage signal, a square wave signal, a triangular wave signal, or an AC voltage signal.

[0057] It can be understood that the signal source unit can output any one of the power supply signals including a DC voltage signal, a square wave signal, a triangular wave signal, or an AC voltage signal. Specifically in use, the signal source unit can be selected according to actual usage requirements.

[0058] In a feasible implementation manner, the voltage acquisition module further includes:

[0059] A pull-up resistor unit, which is respectively connected to the signal source unit and the input ends of at least two detection modules, and is used for voltage division processing of the voltages at the input ends of the at least two detection modules.

[0060] It should be noted that to ensure the stability of the high-voltage interlock detection circuit, resistor units can be respectively arranged at the input ends of the at least two detection modules and at the output ends of the at least two detection modules, so as to ensure that stable voltages can exist at both the input ends and the output ends of the at least two detection modules.

[0061] In this embodiment, the signal processing unit can be connected to the common connection point of the pull-up resistor unit and the at least two detection modules, or to the common connection point of the pull-down resistor unit and the at least two detection modules.

[0062] It should be noted that the voltage acquisition point in this embodiment is set at the common connection point of the pull-up resistor unit and the at least two detection modules, or at the common connection point of the pull-down resistor unit and the at least two detection modules, that is, it is set at the input ends or the output ends of the at least two detection modules.

[0063] In the case where the sampling resistor unit includes a pull-up resistor unit and a pull-down resistor unit, when at least two high-voltage connectors are both in a connected state, the terminal voltage U is:

[0064] U = (Vs / (R 上拉电阻单元 + R 下拉电阻单元 )) × R 下拉电阻单元

[0065] Wherein, Vs is the voltage value of the power supply signal, R 上拉电阻单元 is the resistance value of the pull-up resistor unit, and R 下拉电阻单元 is the resistance value of the pull-up resistor unit.

[0066] When at least one of the at least two high-voltage connectors is in a disconnected state, if the signal processing unit is connected to the common connection point of the pull-up resistor unit and the at least two detection modules, then the terminal voltage U is:

[0067] U = (Vs / (R 上拉电阻单元 + R下拉电阻单元 +R 检测模块x )) × R 下拉电阻单元

[0068] Among them, R 检测模块x is the equivalent resistance value of the detection module corresponding to the high-voltage connector in the disconnected state;

[0069] When at least one of the at least two high-voltage connectors is in the disconnected state, if the signal processing unit is connected to the common connection point of the pull-down resistor unit and the at least two detection modules, the terminal voltage U is:

[0070] U = (Vs / (R 上拉电阻单元 +R 下拉电阻单元 +R 检测模块x )) × (R 检测模块x +R 下拉电阻单元 ).

[0071] When at least one of the at least two high-voltage connectors is in the disconnected state and there is a faulty detection resistor in the detection module, if the signal processing unit is connected to the common connection point of the pull-up resistor unit and the at least two detection modules, the terminal voltage is:

[0072] U' = (Vs / (R 上拉电阻单元 +R 下拉电阻单元 +R' 检测模块x )) × R 下拉电阻单元

[0073] Among them, R' 检测模块x is the equivalent resistance value when the detection module corresponding to the high-voltage connector in the disconnected state is faulty;

[0074] When at least one of the at least two high-voltage connectors is in the disconnected state and there is a faulty detection resistor in the detection module, if the signal processing unit is connected to the common connection point of the pull-down resistor unit and the at least two detection modules, the terminal voltage is:

[0075] U' = (Vs / (R 上拉电阻单元 +R 下拉电阻单元 +R' 检测模块x )) × (R' 检测模块x +R 下拉电阻单元 ).

[0076] Thus, since R' 检测模块x is different from R 检测模块x , U' is different from U. By comparing U' with multiple preset voltage values, the high-voltage connector in the disconnected state and the detection module with a faulty detection resistor can be located.

[0077] In this embodiment, the pull-up resistor unit and the pull-down resistor unit may each include at least two resistor circuits connected in parallel, and each resistor circuit includes at least two sampling resistors connected in series.

[0078] It should be noted that the circuit structures of the pull-up resistor unit and the pull-down resistor unit may be the same as that of the detection module.

[0079] In one example, as Figure 1 shown, when a detection module includes two detection units and each detection unit includes two detection resistors, the pull-up resistor unit may include sampling resistors R11 - R14, and the pull-down resistor unit may include sampling resistors R15 - R18.

[0080] The technical solution of this embodiment is to set at least two detection modules connected in series, and set at least two detection units in the detection modules connected in parallel to each high-voltage connector. At least two detection resistors are provided in each detection unit. When at least one detection resistor in the detection module corresponding to any high-voltage connector fails, since the other detection resistors in the detection module are working properly, the voltage acquisition module can still collect the terminal voltage of any detection module, so that the judgment module can judge the high-voltage interlock state of each high-voltage connector and the failure state of each detection resistor according to different terminal voltages, improving the reliability of the high-voltage interlock detection circuit.

[0081] This application also proposes a high-voltage interlock detection device, which includes:

[0082] The high-voltage interlock detection circuit as described above.

[0083] It should be noted that the specific structure of this high-voltage interlock detection circuit refers to the above embodiment. Since this high-voltage interlock detection device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0084] The above description is only an exemplary embodiment of this application, and does not limit the patent scope of this application. Any equivalent structural transformation made under the technical concept of this application by using the content of the specification and drawings of this application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A high-voltage interlock detection circuit, characterized in that, The high-voltage interlock detection circuit includes: At least two detection modules connected in series, each detection module includes at least two detection units connected in parallel, each detection unit includes at least two detection resistors connected in series, and at least two of the detection modules are also connected in parallel with their respective corresponding high-voltage connectors; A voltage acquisition module, connected to any one of the detection modules, for acquiring the terminal voltage of the detection module and outputting a voltage sampling signal; A judgment module, connected to the voltage acquisition module, for receiving the voltage sampling signal and obtaining the high-voltage interlock state of each high-voltage connector and the fault state of each detection resistor according to the voltage sampling signal.

2. The high-voltage interlock detection circuit according to claim 1, wherein The equivalent resistance values of at least two of the detection modules are different from each other.

3. The high-voltage interlock detection circuit according to claim 2, wherein The voltage acquisition module includes: A pull-down resistor unit, connected to the output terminals of the at least two detection modules, for performing voltage division processing on the output terminal voltages of the at least two detection modules; A signal processing unit, connected to any one of the detection modules, for acquiring the terminal voltage and outputting the voltage sampling signal.

4. The high-voltage interlock detection circuit according to claim 3, wherein The voltage acquisition module further includes: A signal source unit, connected to the input terminals of the at least two detection modules, for outputting a power signal to the at least two detection modules.

5. The high-voltage interlock detection circuit according to claim 4, wherein The voltage acquisition module further includes: A pull-up resistor unit, respectively connected to the signal source unit and the input terminals of the at least two detection modules, for performing voltage division processing on the input terminal voltages of the at least two detection modules.

6. The high-voltage interlock detection circuit according to claim 5, wherein, The signal processing unit is connected to the common connection point of the pull-up resistor unit and the at least two detection modules, or to the common connection point of the pull-down resistor unit and the at least two detection modules.

7. The high-voltage interlock detection circuit according to claim 5, wherein Both the pull-up resistor unit and the pull-down resistor unit include at least two resistor circuits connected in parallel, and each resistor circuit includes at least two sampling resistors connected in series.

8. The high-voltage interlock detection circuit according to claim 4, characterized in that, The power signal is any one of a DC voltage signal, a square wave signal, a triangular wave signal, or an AC voltage signal.

9. The high-voltage interlock detection circuit according to any one of claims 1 to 8, characterized in that The judgment module is a microprogram controller.

10. A high-voltage interlock detection device, characterized in that, The high-voltage interlock detection device includes: The high-voltage interlock detection circuit according to any one of claims 1 to 9.

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