High-voltage connection terminal detection circuit, device and system

Abstract

The utility model discloses a high-voltage connection terminal detection circuit, device and system, and relates to the technical field of electronics, the high-voltage connection terminal detection circuit comprises a high-voltage interlocking circuit, and the high-voltage interlocking circuit comprises a plurality of interlocking parallel branches and a plurality of detection resistors. The detection resistors which are connected in series are respectively connected with the interlocking branches in parallel to form a high-voltage interlocking circuit of which the real-time impedance changes along with the on-off state of the interlocking branches, and then the high-voltage interlocking circuit and the divider resistors are connected between a power supply end and a ground wire in series. The voltage acquisition and processing module acquires the node voltage of the common connection point of the high-voltage interlocking circuit and the divider resistor, and the on-off state of each interlocking branch can be judged by combining the series voltage division principle. Due to the fact that the impedance of a single interlocking branch and the number of the interlocking branches can be set at will, the resolution of real-time impedance changes of the high-voltage interlocking circuit can be improved. And meanwhile, the circuit structure is also convenient for changing the number of the interlocking branches in the later period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, and particularly relates to a high-voltage connection terminal detection circuit, device and system. BACKGROUND

[0002] In the prior art, there are many high-voltage distribution units in an electric vehicle, and the high-voltage distribution units can be connected through high-voltage wiring harnesses and terminals. However, due to the high vibration level of the electric vehicle, the terminals are prone to loosening and falling off due to vibration during operation. In order to ensure the safe operation of the electric vehicle, it is necessary to detect the connection state of each terminal in real time. An interlocking structure is usually arranged at each terminal, and a plurality of interlocking structures are connected in series and connected in parallel with a detection resistor. When the connection state of each interlocking structure changes, the overall resistance value changes, and at this time, the voltage across any one detection resistor can be collected to determine the change in the resistance value, and the current connection state of each terminal can be determined according to the change in the overall resistance value. However, when there are too many terminals connected in series, the resistance value change and voltage change corresponding to each terminal in different connection states become smaller and smaller as the number of terminals increases, the resolution is low, the voltage collection accuracy is affected, and misjudgment is easily caused. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a high-voltage connection terminal detection circuit, device and system, which aims to solve the technical problem of how to improve the resolution of detecting different connection states of a plurality of high-voltage connection terminals.

[0004] To achieve the above-mentioned purpose, the present application provides a high-voltage connection terminal detection circuit, which comprises:

[0005] A high-voltage interlocking circuit, which comprises a plurality of interlocking parallel branches and a plurality of detection resistors connected in parallel with the plurality of interlocking parallel branches, and each detection resistor is connected in series with each other, and each interlocking parallel branch comprises at least two interlocking branches connected in parallel with each other;

[0006] A voltage dividing resistor, one end of which is connected to a power supply end through the high-voltage interlocking circuit, and the other end of which is grounded;

[0007] A voltage acquisition and processing module, which is connected to the common connection point of the voltage dividing resistor and the high-voltage interlocking circuit, is used for detecting the node voltage at the common connection point, and calculates the real-time impedance of the high-voltage interlocking circuit based on the node voltage and the resistance value of the voltage dividing resistor, so as to determine the on-off state of each interlocking branch according to the real-time impedance.

[0008] In an embodiment, the interlocking branch comprises a first resistor and an interlocking terminal.

[0009] The first resistor is connected in series with the interlocking terminal, and the series connection of the first resistor and the interlocking terminal is connected in parallel with one of the corresponding detection resistors.

[0010] In an embodiment, the resistance of the first resistor is different from the resistance of the detection resistor.

[0011] In an embodiment, the resistance of each first resistor connected in parallel with the same detection resistor is different.

[0012] In an embodiment, when the resistance of any two detection resistors is the same, the impedance of each interlocking branch connected in parallel with one of the detection resistors is different from the impedance of each interlocking branch connected in parallel with the other detection resistor.

[0013] In an embodiment, when the resistance of any two detection resistors is different and the number of corresponding parallel interlocking branches is the same, the impedance of each interlocking branch connected in parallel with one of the detection resistors is one-to-one corresponding to the impedance of each interlocking branch connected in parallel with the other detection resistor.

[0014] In addition, to achieve the above object, the application also provides a high-voltage connection terminal detection device, which adopts the high-voltage connection terminal detection circuit as described above.

[0015] In addition, to achieve the above object, the application also provides a high-voltage connection terminal detection system, which adopts the high-voltage connection terminal detection device as described above.

[0016] The embodiments of the application provide a high-voltage connection terminal detection circuit, device and system. The high-voltage connection terminal detection circuit comprises a high-voltage interlocking circuit, the high-voltage interlocking circuit comprising a plurality of interlocking parallel branches and a plurality of detection resistors connected in parallel with the plurality of interlocking parallel branches, the detection resistors being connected in series with each other, and each interlocking parallel branch comprising at least two interlocking branches connected in parallel with each other; a voltage dividing resistor, one end of the voltage dividing resistor being connected to a power supply terminal via the high-voltage interlocking circuit, and the other end of the voltage dividing resistor being grounded; and a voltage acquisition and processing module, the voltage acquisition and processing module being connected to a common connection point of the voltage dividing resistor and the high-voltage interlocking circuit, for detecting a node voltage at the common connection point, and calculating a real-time impedance of the high-voltage interlocking circuit based on the node voltage and the resistance of the voltage dividing resistor, so as to determine the on-off state of each interlocking branch according to the real-time impedance.

[0017] The high-voltage interlocking circuit is formed by connecting multiple detection resistors in series and multiple interlocking branches in parallel, and the high-voltage interlocking circuit and a fixed-resistance voltage dividing resistor are connected in series between a power supply end and a ground wire. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0020] Figure 1 The structural connection diagram provided for the high-voltage connection terminal detection circuit embodiment one of the present application;

[0021] Figure 2 The circuit connection diagram provided for the high-voltage connection terminal detection circuit embodiment two of the present application.

[0022] The purpose implementation, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application, and are not used to limit the present application.

[0024] In order to better understand the technical solutions of the present application, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] The present application proposes a high-voltage connection terminal detection circuit of the first embodiment, please refer to Figure 1 , the high-voltage connection terminal detection circuit comprises:

[0026] A high-voltage interlocking circuit 10, comprising: a plurality of interlocking parallel branches 11 and a plurality of detection resistors Rx connected in parallel with the plurality of interlocking parallel branches 11 respectively, each of the detection resistors Rx being connected in series with each other, each of the interlocking parallel branches 11 comprising at least two interlocking branches 111 connected in parallel with each other;

[0027] A voltage dividing resistor Rf, one end of which is connected to a power supply end via the high-voltage interlocking circuit 10, and the other end of which is grounded;

[0028] A voltage acquisition and processing module 20 connected to the common connection point of the voltage dividing resistor Rf and the high-voltage interlocking circuit 10, for detecting the node voltage at the common connection point, and calculating the real-time impedance of the high-voltage interlocking circuit 10 based on the node voltage and the resistance value of the voltage dividing resistor Rf, so as to determine the on-off state of each of the interlocking branches 111 according to the real-time impedance.

[0029] It should be understood that, for high-voltage wiring harness, since it is necessary to transmit high-voltage at a long distance, a segmented design is usually adopted. Each two segments of high-voltage wiring harness can be connected and fixed by an interlocking structure (or understood as a connection terminal) to prevent the high-voltage wiring harness from being disconnected and to ensure the safety of the high-voltage wiring harness. However, in some environments with high vibration level, the structure may be loose and fall off, and the high-voltage wiring harness may be disconnected due to the looseness of any interlocking structure. At this time, a set of accompanying low-voltage circuit can be designed to check the on-off state of each interlocking structure and the on-off state of the entire high-voltage wiring harness. A series of detection resistors Rx are usually provided, and the interlocking structure at each connection point of the high-voltage wiring harness is connected in parallel with one detection resistor Rx one by one, and the equivalent resistance of the parallel structure formed by the interlocking structure and the corresponding detection resistor Rx also changes with the on-off state, so that the on-off state of each interlocking branch 111 can be determined by acquiring the voltage between both ends of each detection resistor Rx. However, with this method, as the high-voltage transmission line expands, more and more high-voltage wiring harnesses are needed, and more and more interlocking branches 111 are needed, and more and more detection resistors Rx are needed. This situation will cause the voltage range between both ends of each detection resistor Rx corresponding to each interlocking branch 111 closer to the ground to become smaller and smaller when the on-off state is changed. It can be understood that, as the number of interlocking branches 111 connected in series increases, the overall voltage acquisition accuracy and impedance calculation accuracy are continuously decreasing, which is easy to cause misjudgment.

[0030] It should be noted that in the embodiment, the power terminal can be connected to a low-voltage power supply, and the specific output voltage can be 5V. The high-voltage interlocking circuit 10 is a low-voltage circuit accompanying the high-voltage wire harness, and has a plurality of detection resistors Rx connected in series and a plurality of interlocking parallel branches 11 equal in number to the detection resistors Rx, each of which contains at least two interlocking branches 111 connected in parallel. Each interlocking branch 111 corresponds to a connection point of two sections of the high-voltage wire harness. When the connection point is disconnected, the corresponding interlocking branch 111 is in an off state; when the connection point is connected, the corresponding interlocking branch 111 is in an on state and provides a certain impedance.

[0031] It is easy to understand that in the embodiment, one end of the series structure of the detection resistors Rx in the high-voltage interlocking circuit 10 is connected to the power terminal, and the other end of the series structure forms a common connection point with one end of the fixed-resistance voltage dividing resistor Rf, and the other end of the voltage dividing resistor Rf is grounded. The input terminal of the voltage acquisition and processing module 20 is also connected to the common connection point, so that the node voltage at the common connection point, i.e. the voltage across the voltage dividing resistor Rf, can be acquired. Since the high-voltage interlocking circuit 10 and the voltage dividing circuit also form a series structure, the voltage acquisition and processing module 20 can calculate the real-time voltage shared by the high-voltage interlocking circuit 10 from the power supply voltage output by the power terminal and the node voltage, and also calculate the real-time current flowing through the high-voltage interlocking circuit 10 from the node voltage and the resistance of the voltage dividing resistor Rf, and the real-time impedance of the high-voltage interlocking circuit 10 can be calculated from the real-time voltage and the real-time current.

[0032] It should be noted that in the embodiment, if the on-off state of one of the interlocking branches 111 changes, the overall impedance of the interlocking parallel branch 11 in which the interlocking branch 111 is located will change accordingly, and the real-time impedance of the entire high-voltage interlocking circuit 10 will also change accordingly. Therefore, the number of interlocking branches 111 in each state and which interlocking branch 111 is in an open circuit state can be determined by the real-time impedance of the entire high-voltage interlocking circuit 10.

[0033] In the circuit structure proposed in the embodiment, a plurality of interlocking branches 111 are connected in parallel to each detection resistor Rx. Since the impedance provided by the interlocking branches 111 when turned on can be set to different values, and the number of interlocking branches 111 connected in parallel to different detection resistors Rx can also be set to different values, the degree of change in the overall impedance of the high-voltage interlocking circuit 10 when switching the on-off state of each interlocking branch 111 can be freely set, that is, the resolution of the real-time impedance change of the high-voltage interlocking circuit 10 can be freely set, which facilitates the identification of the collected voltage, so that the on-off state of each interlocking branch 111 can be more accurately determined. Even if more interlocking branches 111 are to be added to the high-voltage interlocking circuit 10 later, the judgment accuracy of the voltage collection and processing module 20 will not decrease by setting interlocking branches 111 with appropriate impedance.

[0034] The embodiment of the present application provides a high-voltage connection terminal detection circuit, which comprises: a high-voltage interlocking circuit, the high-voltage interlocking circuit comprising: a plurality of interlocking parallel branches and a plurality of detection resistors connected in parallel with the plurality of interlocking parallel branches, the detection resistors being connected in series with each other, and each interlocking parallel branch comprising at least two interlocking branches connected in parallel with each other; a voltage dividing resistor, one end of the voltage dividing resistor being connected to a power supply end through the high-voltage interlocking circuit, and the other end of the voltage dividing resistor being grounded; and a voltage collection and processing module, the voltage collection and processing module being connected to a common connection point of the voltage dividing resistor and the high-voltage interlocking circuit, for detecting a node voltage at the common connection point, and calculating a real-time impedance of the high-voltage interlocking circuit based on the node voltage and the resistance value of the voltage dividing resistor, so as to determine the on-off state of each interlocking branch according to the real-time impedance. By connecting a plurality of detection resistors connected in series with each other in parallel with a plurality of interlocking branches to form a high-voltage interlocking circuit whose real-time impedance changes with the on-off state of each interlocking branch, and then connecting the high-voltage interlocking circuit and the voltage dividing resistor with a fixed resistance value between the power supply end and the ground, the node voltage at the common connection point of the high-voltage interlocking circuit and the voltage dividing resistor can be collected by the voltage collection and processing module, so that the real-time impedance of the high-voltage interlocking circuit can be obtained according to the node voltage and the resistance value of the voltage dividing resistor, and then the on-off state of each interlocking branch can be determined. Since the impedance of a single interlocking branch and the number of interlocking branches can be set at will, the resolution of the real-time impedance change of the high-voltage interlocking circuit can be improved, and the number of interlocking branches can be changed later, which is convenient for use in actual scenarios.

[0035] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as the above-mentioned first embodiment can be referred to the above description, and will not be described in detail hereinafter. On this basis, please refer to Figure 2 , the interlocking branch 111 comprises: a first resistor R1 and an interlocking terminal S;

[0036] The first resistor R1 is connected in series with the interlock terminal S, and the series connection of the first resistor R1 and the interlock terminal S is connected in parallel with one of the corresponding detection resistors Rx.

[0037] It should be noted that the connection structure shown in the figure is only an example of a specific structure provided by the embodiment. In the embodiment, the interlock branch 111 mainly includes the first resistor R1 and the interlock terminal S. The interlock terminal S can be regarded as a switch device. When the corresponding two sections of the high-voltage cable are normally connected, the corresponding interlock branch 111 is in a conduction state, the interlock terminal S is closed, and the series connection of the first resistor R1 and the interlock terminal S can form a parallel connection with the detection resistor Rx, that is, the first resistor R1 is connected in parallel with the corresponding detection resistor Rx. When the corresponding two sections of the high-voltage cable are not normally connected, the corresponding interlock branch 111 is in a non-conduction state, the interlock terminal S is open, and the interlock branch 111 is equivalent to a circuit breaker, and the first resistor R1 in the interlock branch 111 cannot form a parallel connection with the corresponding detection resistor Rx.

[0038] As can be easily understood from the above description, in the embodiment, the equivalent resistance formed by the interlock branch 111 in the conduction state and the corresponding detection resistor Rx is necessarily different from that in the non-conduction state. Therefore, when the on-off state of any interlock branch 111 changes, the real-time impedance of the high-voltage interlock circuit 10 will necessarily change. In addition, as can be known from the above circuit structure, the equivalent resistance formed by different detection resistors Rx and the corresponding parallel interlock branch 111 will also differ under different conditions, that is, the on-off state and the number of on-off of the interlock branch 111 have a corresponding relationship with the real-time impedance of the high-voltage interlock circuit 10. Through the above corresponding relationship, the voltage acquisition and processing module 20 can accurately determine the on-off state of each interlock branch 111 according to the calculated real-time impedance.

[0039] Further, in the embodiment, the resistance value of the first resistor R1 is different from that of the detection resistor Rx.

[0040] As can be easily understood, in the embodiment, as a setting method, in order to make the change of the equivalent impedance formed by the detection resistor Rx and the corresponding parallel interlock branch 111 (or the interlock parallel branch 11) more obvious, the resistance value of the first resistor R1 and the resistance value of the detection resistor Rx can be set to different values. When the same detection resistor Rx is connected in parallel with a larger number of interlock branches 111, the equivalent resistance value changes more obviously with the on-off state of each interlock branch 111, and the real-time impedance of the entire high-voltage interlock circuit 10 changes more obviously, which facilitates the voltage acquisition and processing module 20 to more accurately determine the on-off state of each interlock branch 111.

[0041] Further, the resistance values of the first resistors R1 in parallel with the same detection resistor Rx are different.

[0042] It is easy to understand that in the embodiment, as a setting mode, the resistance values of the first resistors R1 in the interlocking branches 111 in parallel with the same detection resistor Rx are respectively set as different values, so that the voltage acquisition and processing module 20 can more accurately acquire the real-time impedance of the high-voltage interlocking circuit 10 according to the change of the node voltage, and further more accurately determine which detection resistor Rx corresponds to which interlocking branch 111 in which state of connection / disconnection, or understand which connection node of the high-voltage cable is disconnected.

[0043] Further, in the embodiment, when the resistance values of any two detection resistors Rx are the same, the impedances of the interlocking branches 111 in parallel with one of the detection resistors Rx are different from the impedances of the interlocking branches 111 in parallel with the other detection resistor Rx.

[0044] It is easy to understand that in the embodiment, the resistance values of the different detection resistors Rx can be set as the same value, but in this case, the resistance values of the first resistors R1 in the interlocking branches 111 can all be set as different values. For example, two detection resistors Rx are respectively in parallel with two interlocking branches 111, and the impedance of each detection resistor Rx is 100Ω. The resistance values of the first resistors R1 in the two interlocking branches 111 in parallel with one of the detection resistors Rx can be set as 50Ω and 150Ω respectively, and the resistance values of the first resistors R1 in the two interlocking branches 111 in parallel with the other detection resistor Rx can be set as 75Ω and 125Ω respectively. It can be found that such setting can ensure that the equivalent impedance of the high-voltage interlocking circuit 10 is different when the connection / disconnection state of the different interlocking branches 111 changes. In this way, it can be ensured that when each interlocking branch 111 switches between the connection state and the disconnection state, the change of the real-time impedance of the high-voltage interlocking circuit 10 is different.

[0045] Further, in the embodiment, when the resistance values of any two detection resistors Rx are different and the number of the interlocking branches 111 in parallel with each detection resistor Rx is the same, the impedances of the interlocking branches 111 in parallel with one of the detection resistors Rx are one-to-one corresponding to the impedances of the interlocking branches 111 in parallel with the other detection resistor Rx.

[0046] It is easy to understand that in the embodiment, the resistance values of the different detection resistors Rx can also be set to different values, but in this case, the resistance values of the first resistors R1 in each interlocking branch 111 can be set to the same resistance value one by one, for example, two detection resistors Rx are each connected in parallel with two interlocking branches 111, and the resistance values of the detection resistors Rx are 100Ω and 200Ω respectively, and the resistance values of the first resistors R1 in the two interlocking branches 111 connected in parallel with one of the detection resistors Rx can be set to 50Ω and 150Ω respectively, and the resistance values of the first resistors R1 in the two interlocking branches 111 connected in parallel with the other detection resistor Rx can also be set to 50Ω and 150Ω respectively. In this way, in the case where the resistance values of the detection resistors Rx are not the same, the changes in the real-time impedance of the high-voltage interlocking circuit 10 when the on-off state of each interlocking branch 111 changes are not the same and have certain regularity, facilitating the setting of the correspondence between the real-time impedance of the high-voltage interlocking circuit 10 and the on-off state change of each interlocking branch 111.

[0047] In addition, to achieve the above-mentioned purpose, the embodiment of the application also provides a high-voltage connection terminal detection device, which adopts all the embodiments of the high-voltage connection terminal detection circuit described above. Compared with the prior art, the high-voltage connection terminal detection device provided by the embodiment of the application has the same beneficial effects as the high-voltage connection terminal detection circuit provided by the above-mentioned embodiments, and the other technical features of the high-voltage connection terminal detection device are the same as the features disclosed in the above-mentioned embodiments, which will not be repeated here.

[0048] In addition, to achieve the above-mentioned purpose, the embodiment of the application also provides a high-voltage connection terminal detection system, which adopts all the embodiments of the high-voltage connection terminal detection device described above. Compared with the prior art, the high-voltage connection terminal detection system provided by the embodiment of the application has the same beneficial effects as the high-voltage connection terminal detection device provided by the above-mentioned embodiments, and the other technical features of the high-voltage connection terminal detection system are the same as the features disclosed in the above-mentioned embodiments, which will not be repeated here.

[0049] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent processing scope of the application.

Claims

1. A high voltage connection terminal detection circuit, characterized by, The high-voltage connection terminal detection circuit comprises: a high-voltage interlocking circuit comprising a plurality of interlocking parallel branches and a plurality of detection resistors connected in parallel with the plurality of interlocking parallel branches, the detection resistors being connected in series with each other, and each interlocking parallel branch comprising at least two interlocking branches connected in parallel with each other; a voltage dividing resistor, one end of which is connected to a power supply terminal via the high-voltage interlocking circuit, and the other end of which is grounded; a voltage acquisition and processing module connected to a common connection point of the voltage dividing resistor and the high-voltage interlocking circuit, for detecting a node voltage at the common connection point, and calculating a real-time impedance of the high-voltage interlocking circuit based on the node voltage and a resistance value of the voltage dividing resistor, so as to determine the on-off state of each interlocking branch according to the real-time impedance.

2. The high-voltage connection terminal detection circuit according to claim 1, characterized in that, The interlocking branch comprises a first resistor and an interlocking terminal. The first resistor and the interlocking terminal are connected in series, and the series connection of the first resistor and the interlocking terminal is connected in parallel with one of the corresponding detection resistors.

3. The high-voltage connection terminal detection circuit according to claim 2, characterized in that, The resistance value of the first resistor is different from that of the detection resistor.

4. The high-voltage connection terminal detection circuit according to claim 2, characterized in that, The resistance values of the first resistors connected in parallel with the same detection resistor are different.

5. The high-voltage connection terminal detection circuit according to any one of claims 1 to 4, characterized in that, When the resistance values of any two detection resistors are the same, the impedance of each interlocking branch connected in parallel with one of the detection resistors is different from that of each interlocking branch connected in parallel with the other detection resistor.

6. The high-voltage connection terminal detection circuit according to any one of claims 1 to 4, characterized in that, When the resistance values of any two detection resistors are different and the number of interlocking branches connected in parallel with each detection resistor is the same, the impedance of each interlocking branch connected in parallel with one of the detection resistors is one-to-one corresponding to that of each interlocking branch connected in parallel with the other detection resistor.

7. A high-voltage connection terminal detection device, characterized by comprising: The high-voltage connection terminal detection device adopts the high-voltage connection terminal detection circuit according to any one of claims 1-6.

8. A high voltage connection terminal detection system characterized by, The high-voltage connection terminal detection system adopts the high-voltage connection terminal detection device according to claim 7.

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