Connection detection device and connection detection system

Abstract

The embodiment of the utility model provides a connection detection device and a connection detection system. The connection detection device comprises an inter-board connector which comprises a first joint which is installed on a first sub-circuit board, a plurality of first butt joint positions of the first joint are provided with a plurality of first pins, and each pin is connected to a first power supply voltage; the second connector is installed on the second sub-circuit board, a plurality of second butt joint positions of the second connector are provided with a plurality of second pins, and when the first butt joint position is in butt joint with the corresponding second butt joint position, the first pin corresponding to the first butt joint position is connected to the second pin corresponding to the second butt joint position; a plurality of input ends of the logic AND gate circuit are respectively connected to the second pin, and an output end of the logic AND gate circuit outputs a first signal indicating that the first connector and the second connector complete butt joint when the plurality of input ends receive the high-level signal. Therefore, the stability detection of the inter-board connector is realized.

Description

Technical Field

[0001] The present application relates to the field of automotive electronics technology, and in particular to a connection detection device and a connection detection system. Background Art

[0002] With the advancement of intelligent and connected vehicles, the distributed automotive electrical and electronic architecture (EEA), originally based on electronic control units (ECUs), has gradually exposed numerous problems and challenges. To address these issues with distributed EEAs, a proposal has been made to integrate similar but separate ECU functions onto a more powerful processor hardware platform, namely, a domain controller (DCU).

[0003] Connecting two or more PCBs (Printed Circuit Boards) within a single domain controller often presents the challenge. In related art, connections between multiple PCBs within a domain controller typically rely on structural fixation, such as using B2B (board-to-board) connectors to connect different PCBs.

[0004] Since the B2B package is not fixed by welding or screws, it relies only on the friction between the connector male and female to maintain the connection, which is prone to unstable connection problems. However, the relevant technology does not test the stability of the B2B connector. Summary of the Invention

[0005] In view of this, embodiments of the present application provide a connection detection device and a connection detection system to solve or alleviate the problem in the related art that the stability of the B2B connector is not detected.

[0006] According to a first aspect of an embodiment of the present application, a connection detection device is provided, which is applied to a domain controller circuit board. The domain controller circuit board includes a first sub-circuit board and a second sub-circuit board. The connection detection device includes: an inter-board connector, including: a first connector, installed on the first sub-circuit board, and a plurality of first docking positions of the first connector are provided with a plurality of first pins, each pin is connected to a first power supply voltage; a second connector, installed on the second sub-circuit board, and a plurality of second docking positions of the second connector are provided with a plurality of second pins, wherein when the first docking position is docked with the corresponding second docking position, the first pin corresponding to the first docking position is connected to the second pin corresponding to the second docking position; a logic AND gate circuit, wherein the plurality of input ends of the logic AND gate circuit are respectively connected to the second pins, and the output end of the logic AND gate circuit outputs a first signal indicating that the first connector and the second connector have completed docking when all the plurality of input ends receive high-level signals.

[0007] In some embodiments of the present application, the output terminal of the logic AND gate circuit outputs a second signal indicating that the first connector and the second connector are not connected when any input terminal among the multiple input terminals is a low level signal.

[0008] In some embodiments of the present application, the logic AND gate circuit includes a series switch tube formed by multiple switch tubes connected in series, the multiple switch tubes correspond to multiple second pins respectively, the control end of each switch tube is connected to the corresponding second pin, one end of the series switch tube serves as the output end of the logic AND gate circuit, and is connected to the second power supply voltage through a detection resistor, and the other end of the series switch tube is connected to the ground voltage, each switch tube is turned on when the control end receives the first power supply voltage, and is turned off when the control end receives the ground voltage.

[0009] In some embodiments of the present application, the series switching tubes are multiple transistors with collectors and emitters connected, and the base of each transistor serves as a control terminal.

[0010] In some embodiments of the present application, different first docking positions of the first connector are provided with multiple pull-up resistors corresponding to multiple first pins, each pin is connected to one end of the corresponding pull-up resistor, and the other ends of the multiple pull-up resistors are all connected to the first power supply voltage.

[0011] In some embodiments of the present application, the connection detection device further includes: a controller connected to the output end of the logic AND gate circuit, and configured to receive the first signal or the second signal.

[0012] In some embodiments of the present application, the series switch tubes are multiple MOS tubes with gates and drains connected, and the gate of each MOS tube serves as a control terminal.

[0013] In some embodiments of the present application, each MOS tube is an N-type MOS tube, the source of the series switch tube is connected to the ground voltage, the drain of the series switch tube is connected to the second power supply voltage, and the first power supply voltage is the same as the second power supply voltage.

[0014] In some embodiments of the present application, multiple first docking positions are arranged at the connecting portion of the first joint, and multiple second docking positions are arranged at the connecting portion of the second joint, and the multiple first docking positions are matched with the multiple second docking positions respectively.

[0015] According to a second aspect of an embodiment of the present application, a connection detection system is provided, which includes: a domain controller circuit board, including a first sub-circuit board and a second sub-circuit board; and a connection detection device as in any of the above embodiments.

[0016] According to the connection detection device and connection detection system provided in the embodiments of the present application, by connecting each pin of the first connector to the first power supply voltage, when the first pin and the second pin are connected, the second pin is also connected to the first power supply voltage, thereby enabling the second pin to provide a high-level signal to the input end of the logic AND gate circuit, thereby inputting the first signal indicating that the first connector and the second connector have completed docking through the output end of the logic AND gate circuit, thereby realizing stability detection of the inter-board connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 1 is a structural diagram of a connection detection device according to an embodiment of the present application;

[0019] Figure 2 is a structural diagram of a connection detection device according to another embodiment of the present application;

[0020] Figure 3 2 is a structural block diagram of a connection detection system according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0022] The specific implementation of the embodiments of the present application is further explained below in conjunction with the embodiments of the present application and the accompanying drawings.

[0023] Figure 1 Schematic diagram of the structure of a connection detection device according to an embodiment of the present application.

[0024] like Figure 1 As shown, the connection detection device 100 includes: an inter-board connector 101 and a logic AND gate circuit 102, wherein the inter-board connector 101 includes: a first connector 1011, mounted on a first sub-circuit board, wherein a plurality of first docking positions of the first connector 1011 are provided with a plurality of first pins, each pin being connected to a first power supply voltage; a second connector 1012, mounted on a second sub-circuit board, wherein a plurality of second docking positions of the second connector 1012 are provided with a plurality of second pins, wherein when a first docking position is docked with a corresponding second docking position, the first pin corresponding to the first docking position is connected to the second pin corresponding to the second docking position;

[0025] The logic AND gate circuit 102 has multiple input terminals connected to the second pins respectively, and the output terminal of the logic AND gate circuit 102 outputs a first signal indicating that the first connector and the second connector are connected when the multiple input terminals all receive high-level signals.

[0026] In some other embodiments, the output terminal of the logic AND gate circuit 102 outputs a second signal indicating that the first connector and the second connector are not connected when any one of the multiple input terminals is a low level signal.

[0027] Specifically, inter-board connector 101 is a B2B connector that connects different PCBs via a male connector (i.e., first connector 1011) and a female connector (i.e., second connector 1012). The first sub-circuit board and the second sub-circuit board are respectively the first PCB board where the male connector is located and the second PCB board where the female connector is located.

[0028] The connection detection device 100 is applied to the domain controller circuit board DCU, which includes a first sub-circuit board and a second sub-circuit board. The DCU serves as the core of each functional domain of a car and is mainly composed of three parts: a domain master processor, an operating system, and application software and algorithms. The DCU integrates core functions that originally required many ECUs to implement, greatly improving the functional integration of the vehicle system and reducing the development and manufacturing costs of the vehicle.

[0029] In some embodiments, a plurality of first docking positions are provided at the connection portion of the first connector 1011 , and a plurality of second docking positions are provided at the connection portion of the second connector 1012 , and the plurality of first docking positions are matched with the plurality of second docking positions respectively.

[0030] That is to say, if Figure 1 As shown, the first connector 1011 has a plurality of first docking positions provided with a plurality of first pins PIN(1)_male, PIN(2)_male, ... PIN(N-1)_male, and PIN(N)_male, and the second connector 1012 has a plurality of second docking positions provided with a plurality of second pins PIN(1)_female, PIN(2)_female, ... PIN(N-1)_female, and PIN(N)_female. The first docking position and the second docking position match each other. When the first docking position is docked with the corresponding second docking position, the first pin corresponding to the first docking position is connected to the second pin corresponding to the second docking position, such as the PIN(1)_male is connected to the PIN(1)_female.

[0031] The logic AND gate circuit 102 can be implemented by devices with switching functions such as transistors and field effect transistors. This embodiment does not limit the connection relationship between the various devices, and it only needs to implement AND gate logic.

[0032] Since the B2B connector package is not welded or screwed, it relies only on the friction between the male and female connectors to maintain the connection. Therefore, it may become loose or fall off during transportation or use, resulting in signal interruption or short circuit and other faults.

[0033] To solve this problem, the present application sets up a logic AND gate circuit 102, and connects multiple input terminals of the logic AND gate circuit 102 to the second pin respectively. It can be understood that, continue to refer to Figure 1When the inter-board connector 101 connects the first sub-circuit board and the second sub-circuit board, the first connector 1011 and the second connector 1012 of the inter-board connector 101 will be snapped together, so that the multiple first pins of the first connector 1011 and the second pins of the second connector 1012 are connected to each other. At this time, since the first pins are connected to the first power supply voltage VCC (usually 3.3V power supply voltage or 5V power supply voltage), the second pins can also be considered to be connected to the first power supply voltage.

[0034] Furthermore, the multiple input terminals of the logic AND gate circuit 102, which are respectively connected to the second pins, input the first power supply voltage, so that the multiple input terminals all receive high-level signals. At this time, according to the circuit characteristics of the logic AND gate circuit 102, when its inputs are all high-level signals, the output will also be a high-level signal. Therefore, when the multiple input terminals all receive high-level signals, the logic AND gate circuit 102 will output a first signal (i.e., a high-level signal) indicating that the first connector and the second connector are connected. Conversely, when any of the multiple input terminals of the logic AND gate circuit 102 receives a low-level signal, according to the circuit characteristics of the logic AND gate circuit 102, the output terminal of the logic AND gate circuit 102 will output a second signal (i.e., a low-level signal) indicating that the first connector and the second connector are not connected.

[0035] In this way, by connecting each pin of the first connector to the first power supply voltage, when the first pin and the second pin are connected, the second pin is also connected to the first power supply voltage, so that the second pin can provide a high-level signal to the input end of the logic AND gate circuit, thereby inputting the first signal indicating that the first connector and the second connector have completed docking through the output end of the logic AND gate circuit, thereby realizing the stability detection of the inter-board connector.

[0036] In some embodiments, the logic AND gate circuit 102 includes a series switch tube formed by multiple switch tubes connected in series, and the multiple switch tubes correspond to multiple second pins respectively. The control end of each switch tube is connected to the corresponding second pin. One end of the series switch tube serves as the output end of the logic AND gate circuit 102 and is connected to the second power supply voltage through a detection resistor. The other end of the series switch tube is connected to the ground voltage. Each switch tube is turned on when the control end receives the first power supply voltage and is turned off when the control end receives the ground voltage.

[0037] Furthermore, in some embodiments, the series switching tubes are multiple transistors with collectors and emitters connected, and the base of each transistor serves as a control terminal.

[0038] For example, Figure 2 2 is a schematic structural diagram of a connection detection device according to another embodiment of the present application.

[0039] like Figure 2As shown, the logic AND gate circuit 102 in the connection detection device 100 is formed by a plurality of transistors T1, T2, T3 and T4 connected in series, wherein the control terminals (i.e., base terminals) of T1, T2, T3 and T4 are respectively connected to the second pins PIN(1)_female, PIN(2)_female...PIN(N-1)_female and PIN(N)_female of the second connector, the collector terminal of T1 serves as the output terminal of the logic AND gate circuit 102 and is connected to the second power supply voltage through the detection resistor R'. The second power supply voltage VCC is the same as the first power supply voltage VCC, typically a 3.3V power supply voltage or a 5V power supply voltage. The emitter terminal of T4 is connected to the ground voltage VDD. It should be noted that the number of transistors can be adjusted according to actual needs and is not limited in this application.

[0040] When the inter-board connector 101 connects the first sub-circuit board and the second sub-circuit board, the first connector 1011 and the second connector 1012 of the inter-board connector 101 will be snapped together, so that the multiple first pins of the first connector 1011 and the second pins of the second connector 1012 are connected to each other. At this time, since the first pins are connected to the first power supply voltage VCC, the second pins can also be considered to be connected to the first power supply voltage.

[0041] Furthermore, the control terminals of T1, T2, T3, and T4, which are respectively connected to the second pins, input the first power supply voltage, causing each transistor to conduct. Since the emitter of T4 is connected to the ground voltage VDD, the lower end of the detection resistor R' will output a first signal (i.e., a low level) indicating that the first connector and the second connector are fully connected. Conversely, when the first connector 1011 and the second connector 1012 of the inter-board connector 101 are not fastened together properly, so that the multiple first pins of the first connector 1011 and the second pins of the second connector 1012 are not fully connected, at this time, some of the transistors are turned on, and some of the transistors are turned off. Therefore, the lower end of the detection resistor R' will output a second signal (i.e., a high level) indicating that the first connector and the second connector are fully connected.

[0042] In this way, the present application can monitor in real time the unstable connection problem of the inter-board connector caused by installation, vibration, etc.

[0043] In some embodiments, multiple pull-up resistors corresponding to multiple first pins are provided at different first docking positions of the first connector, each pin is connected to one end of the corresponding pull-up resistor, and the other ends of the multiple pull-up resistors are all connected to the first power supply voltage.

[0044] It can be understood that when the GPIO is configured in pull-up mode, the internal resistor will be connected to the VCC end of the GPIO. When there is no external pull-down signal on the GPIO pin, due to the presence of the internal resistor, the pin will automatically be pulled up to the power supply voltage level (i.e., the first power supply voltage VCC), thereby avoiding false triggering operations caused by external noise.

[0045] Continue to refer to Figure 2 The first connector is provided with a plurality of pull-up resistors R1, R2, R3, and R4 corresponding to the plurality of first pins at different first docking positions, and one end of the plurality of pull-up resistors R1, R2, R3, and R4 is respectively connected to the first pins PIN(1)_male, PIN(2)_male...PIN(N-1)_male, and PIN(N)_male of the first connector, and the other end is connected to the first power supply voltage VCC. It should be noted that the number of pull-up resistors can be adjusted according to actual needs and is not limited in this application.

[0046] That is to say, each pin of the first connector is connected to the first power supply voltage through a pull-up resistor and the first power supply voltage, so that when the first pin and the second pin are connected, the second pin is also connected to the first power supply voltage, thereby enabling the second pin to provide a high-level signal to the input end of the logic AND gate circuit, thereby inputting the first signal indicating that the first connector and the second connector have completed docking through the output end of the logic AND gate circuit, thereby realizing stability detection of the inter-board connector.

[0047] In some embodiments, the connection detection device 100 further includes: a controller 103 connected to the output end of the logic AND gate circuit 102 and configured to receive the first signal or the second signal.

[0048] Controller 103 may be an MCU (Microcontroller Unit), which integrates a computer's CPU, memory, I / O ports, serial ports, timers, interrupt system, special function registers, and other components onto a single chip. This MCU is used in various products to perform operations and control. The in-vehicle MCU is the core component of an automotive electronic control unit, responsible for processing various information and primarily used for body control, driving control, infotainment, and driver assistance systems.

[0049] Continue to refer to Figure 2The controller 103 in the connection detection device 100 is connected to the output end of the logic AND gate circuit 102, and is used to receive the first signal or the second signal, so as to determine the detection result corresponding to the first signal or the second signal according to the preset rule. For example, if the signal received according to the preset rule in the controller 103 is a high-level signal, it is determined that the connection between the board connector is stable; if the received signal is a low-level signal, it is determined that the connection between the board connector is unstable and an abnormal reminder is required; or, if the received signal is a low-level signal, it is determined that the connection between the board connector is stable; if the received signal is a high-level signal, it is determined that the connection between the board connector is stable.

[0050] It is understood that when the received signals are voltage signals of different magnitudes, the voltage value corresponding to the voltage signal is used to determine whether there is a connection problem with the inter-board connector. For example, when the received signal is a voltage signal close to 3.3V or 5.5V, the inter-board connector connection is determined to be stable. When the received signal is a voltage signal close to 0V, the inter-board connector connection is determined to be unstable and an abnormality reminder is required. It should be noted that the preset rules for the controller to perform connector connection stability detection based on the first signal or the second signal can be adjusted according to actual needs and are not limited in this application.

[0051] In this way, the controller monitors in real time whether the connection between the board connectors is stable. When an unstable connection occurs, the user will be prompted to perform repairs. Moreover, through the cooperation of the controller and the above-mentioned detection circuit, a detection scheme combining hardware detection and software detection is realized, which can timely monitor the connection status of the inter-board connectors.

[0052] In some embodiments, the series switch tubes are multiple MOS tubes with gates and drains connected, and the gate of each MOS tube serves as a control terminal.

[0053] Furthermore, in some embodiments, each MOS tube is an N-type MOS tube, the source of the series switch tube is connected to the ground voltage, the drain of the series switch tube is connected to the second power supply voltage, and the first power supply voltage is the same as the second power supply voltage.

[0054] That is to say, you can Figure 2 The transistors T1, T2, T3, and T4 are replaced by a plurality of N-type MOS transistors t1, t2, t3, and t4. Similarly, the gates of the plurality of N-type MOS transistors t1, t2, t3, and t4 serve as control terminals and are connected to the corresponding second pins PIN(1)_female, PIN(2)_female, ..., PIN(N-1)_female, and PIN(N)_female, respectively. The drain of t1 is connected to the second power supply voltage VCC and the detection resistor R', and the source of t4 is connected to the ground voltage VDD. It should be noted that the number of the plurality of N-type MOS transistors can be adjusted according to actual needs and is not limited in this application.

[0055] When the inter-board connector 101 connects the first sub-circuit board and the second sub-circuit board, the first connector 1011 and the second connector 1012 of the inter-board connector 101 will be snapped together, so that the multiple first pins of the first connector 1011 and the second pins of the second connector 1012 are connected to each other. At this time, since the first pins are connected to the first power supply voltage VCC, the second pins can also be considered to be connected to the first power supply voltage.

[0056] Furthermore, the control terminals of t1, t2, t3, and t4, which are respectively connected to the second pins, input the first power supply voltage, causing each transistor to conduct. Since the source of t4 is connected to the ground voltage VDD, the lower end of the detection resistor R' will output a first signal (i.e., a low level) indicating that the first connector and the second connector are fully connected. Conversely, when the first connector 1011 and the second connector 1012 of the inter-board connector 101 are not fastened together properly, so that the multiple first pins of the first connector 1011 and the second pins of the second connector 1012 are not fully connected, at this time, some of the N-type MOS transistors are turned on, and some of the MOS transistors are turned off. Therefore, the lower end of the detection resistor R' will output a second signal (i.e., a high level) indicating that the first connector and the second connector are fully connected.

[0057] In summary, the present application connects each pin of the first connector to the first power supply voltage, so that when the first pin and the second pin are connected, the second pin is also connected to the first power supply voltage, thereby enabling the second pin to provide a high-level signal to the input end of the logic AND gate circuit, thereby inputting the first signal indicating that the first connector and the second connector have completed docking through the output end of the logic AND gate circuit, thereby realizing stability detection of the inter-board connector.

[0058] Figure 3 2 is a structural block diagram of a connection detection system according to an embodiment of the present application.

[0059] like Figure 3 As shown, the connection detection system 300 includes: a domain controller circuit board 301, including a first sub-circuit board 3011 and a second sub-circuit board 3012, and a connection detection device 100 according to any of the above embodiments. The first sub-circuit board 3011 and the second sub-circuit board 3012 refer to the first and second PCBs. The domain controller circuit board 301 refers to the domain controller circuit board (DCU). As the core of each functional domain of the vehicle, the DCU mainly consists of three parts: a domain master processor, an operating system, and application software and algorithms. The DCU integrates core functions that originally required multiple ECUs to implement, greatly improving the functional integration of the vehicle system and reducing the development and manufacturing costs of the vehicle.

[0060] According to the connection detection system of the embodiment of the present application, by connecting each pin of the first connector to the first power supply voltage, when the first pin and the second pin are connected, the second pin is also connected to the first power supply voltage, thereby enabling the second pin to provide a high-level signal to the input end of the logic AND gate circuit, thereby inputting the first signal indicating that the first connector and the second connector have completed docking through the output end of the logic AND gate circuit, thereby realizing stability detection of the inter-board connector.

[0061] Thus far, specific embodiments of the present subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing may be advantageous.

[0062] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0063] It should be pointed out that, according to the needs of implementation, the various components / steps described in the embodiments of the present application can be split into more components / steps, or two or more components / steps or partial operations of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present application.

[0064] Those skilled in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of this application.

[0065] The above embodiments are only used to illustrate the embodiments of the present application and are not intended to limit the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of the present application, and the scope of patent protection of the embodiments of the present application should be defined by the claims. The systems, devices, or modules described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions.

Claims

1. A connection detection device, characterized in that: Applied to a domain controller circuit board, the domain controller circuit board includes a first sub-circuit board and a second sub-circuit board, and the connection detection device includes: Inter-board connectors, including: a first connector mounted on the first sub-circuit board, wherein a plurality of first docking positions of the first connector are provided with a plurality of first pins, each pin being connected to a first power supply voltage; a second connector mounted on the second sub-circuit board, wherein a plurality of second docking positions of the second connector are provided with a plurality of second pins, wherein when a first docking position is docked with a corresponding second docking position, a first pin corresponding to the first docking position is connected to a second pin corresponding to the second docking position; A logic AND gate circuit, wherein the multiple input ends of the logic AND gate circuit are respectively connected to the second pin, and the output end of the logic AND gate circuit outputs a first signal indicating that the first connector and the second connector are connected when the multiple input ends all receive high-level signals.

2. The connection detection device according to claim 1, characterized in that: The output end of the logic AND gate circuit outputs a second signal indicating that the first connector and the second connector are not connected when any input end of the multiple input ends is a low level signal.

3. The connection detection device according to claim 2, characterized in that: The logic AND gate circuit includes a series switch tube formed by multiple switch tubes connected in series, and the multiple switch tubes correspond to the multiple second pins respectively. The control end of each switch tube is connected to the corresponding second pin. One end of the series switch tube serves as the output end of the logic AND gate circuit and is connected to the second power supply voltage through a detection resistor. The other end of the series switch tube is connected to the ground voltage. Each switch tube is turned on when the control end receives the first power supply voltage and is turned off when the control end receives the ground voltage.

4. The connection detection device according to claim 3, characterized in that: The series switching tubes are multiple triodes with collectors and emitters connected, and the base of each triode serves as a control terminal.

5. The connection detection device according to claim 1, characterized in that: A plurality of pull-up resistors corresponding to the plurality of first pins are provided at different first docking positions of the first connector, each pin is connected to one end of the corresponding pull-up resistor, and the other ends of the plurality of pull-up resistors are all connected to the first power supply voltage.

6. The connection detection device according to claim 2, characterized in that: The connection detection device further comprises: A controller is connected to the output end of the logic AND gate circuit and is used to receive the first signal or the second signal.

7. The connection detection device according to claim 3, characterized in that: The series switch tubes are multiple MOS tubes with gates and drains connected, and the gate of each MOS tube serves as a control terminal.

8. The connection detection device according to claim 7, characterized in that: Each MOS tube is an N-type MOS tube, the source of the series switch tube is connected to the ground voltage, the drain of the series switch tube is connected to the second power supply voltage, and the first power supply voltage is the same as the second power supply voltage.

9. The connection detection device according to claim 1, wherein: The plurality of first docking positions are arranged at the connection portion of the first connector, the plurality of second docking positions are arranged at the connection portion of the second connector, and the plurality of first docking positions are matched with the plurality of second docking positions respectively.

10. A connection detection system, characterized in that: include: A domain controller circuit board, comprising a first sub-circuit board and a second sub-circuit board; A connection detection device as claimed in any one of claims 1 to 9.

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