Coaxial cable protection circuit, transmission system and vehicle

Abstract

The application provides a coaxial cable protection circuit, a transmission system and a vehicle, which are used to reduce the operation failure rate of coaxial cable signal transmission, improve the anti-interference ability and operation stability of the coaxial cable signal transmission, and improve the operation ability of the coaxial cable signal transmission under the complex electromagnetic working conditions of the vehicle. The circuit comprises a signal processing module, a non-inverting pin connected to a coaxial cable connector through a direct current isolation module, an electromagnetic interference suppression module connected to a connection line between the direct current isolation module and the coaxial cable connector, at least one electrostatic protection module, a first end of which is connected to the connection line between the non-inverting pin of the signal processing module and the coaxial cable connector, a second end of which is grounded, a voltage conversion module, a first end of which is connected to a power supply device or a load device, and a second end of which is connected to the connection line between the direct current isolation module and the electromagnetic interference suppression module.

Description

Technical Field

[0001] This application relates to the field of coaxial cable technology, and more particularly to a coaxial cable protection circuit, transmission system, and vehicle. Background Technology

[0002] Power over Coax (PoC) technology is a transmission system that simultaneously transmits high-speed data signals and DC power through a single coaxial cable. In the field of automotive image transmission, PoC technology is one of the core technologies for signal transmission from sensors such as automotive cameras and radar.

[0003] With the continuous improvement of sensing accuracy, vehicle-mounted PoC systems need to support higher transmission speeds and greater power supply, which poses a severe challenge to signal integrity and electromagnetic compatibility. However, traditional single-ended PoC protection circuits have a simple structure and a single protection system, usually only equipped with basic surge protection devices, which are difficult to effectively resist multiple threats such as electrostatic discharge, surges and electromagnetic interference. As a result, the anti-interference capability of coaxial cable signal transmission is weak, the failure rate is high, and it is difficult to operate stably for a long time under the complex electromagnetic conditions of vehicles. Summary of the Invention

[0004] This application provides a coaxial cable protection circuit, transmission system, and vehicle to reduce the failure rate of coaxial cable signal transmission, improve the anti-interference capability and operational stability of coaxial cable signal transmission, and enhance its operational capability under complex electromagnetic conditions in vehicles.

[0005] This application provides a coaxial cable protection circuit, including: a signal processing module, a DC blocking module, a coaxial cable connector, an electromagnetic interference suppression module, a voltage conversion module, and at least one electrostatic discharge (ESD) protection module. The signal processing module has its non-inverting pin connected to the coaxial cable connector via the DC blocking module. The electromagnetic interference suppression module is connected to the connection line between the DC blocking module and the coaxial cable connector. The at least one electrostatic discharge protection module has its first end connected to the connection line between the non-inverting pin of the signal processing module and the coaxial cable connector, and its second end grounded. The voltage conversion module has its first end connected to the power supply equipment or load equipment, and its second end connected to the connection line between the DC blocking module and the electromagnetic interference suppression module.

[0006] The coaxial cable protection circuit provided in this application embodiment includes an electromagnetic interference suppression module and at least one electrostatic discharge (ESD) protection module on the circuit between the signal processing module and the coaxial cable connector. The electromagnetic interference suppression module suppresses electromagnetic interference, and the at least one ESD protection module suppresses ESD interference and / or surge interference, thereby suppressing conducted and radiated interference during coaxial cable signal transmission, reducing the failure rate of coaxial cable signal transmission, improving the anti-interference capability and operational stability of coaxial cable signal transmission, and enhancing its operational capability under complex electromagnetic conditions in vehicles.

[0007] In one possible implementation, there are multiple electrostatic discharge (ESD) protection modules, and at least one first end of the ESD protection module is connected to the connection line between the non-inverting pin of the signal processing module and the DC blocking module, and the connection line between the electromagnetic interference suppression module and the coaxial cable connector.

[0008] In the coaxial cable protection circuit provided in this application embodiment, when there are multiple electrostatic discharge (ESD) protection modules, at least one first end of an ESD protection module is connected to the connection line between the non-inverting pin of the signal processing module and the DC blocking module. Similarly, at least one first end of an ESD protection module is connected to the connection line between the electromagnetic interference suppression module and the coaxial cable connector. In this way, a two-level ESD protection is formed. Through the cooperation of the electromagnetic interference suppression module and the two-level ESD protection, electromagnetic interference, ESD interference, and surge interference are suppressed in stages, thereby effectively suppressing conducted interference and radiated interference during coaxial cable signal transmission, reducing the failure rate of coaxial cable signal transmission, and improving the anti-interference capability and operational stability of coaxial cable signal transmission.

[0009] In one possible implementation, the circuit further includes a filtering module, with a first end connected to the voltage conversion module and a second end connected to the connection line between the DC blocking module and the electromagnetic interference suppression module.

[0010] In one possible implementation, the voltage conversion module includes a boost circuit and / or a buck circuit.

[0011] In one possible implementation, the DC blocking module includes a single capacitor or multiple capacitors connected in series.

[0012] In one possible implementation, the electromagnetic interference suppression module includes a feedthrough filter, with a first end connected to the DC blocking module, a second end connected to the coaxial cable connector, and a third and fourth end grounded.

[0013] In one possible implementation, the signal processing module includes a deserializer or a serializer.

[0014] This application provides a coaxial cable transmission system, including a first transmission terminal and a second transmission terminal connected by a coaxial cable. The first transmission terminal includes a power supply device and a coaxial cable protection circuit as described above, and the second transmission terminal includes a load device and a coaxial cable protection circuit as described above.

[0015] This application provides a vehicle, including a vehicle body and a coaxial cable transmission system as described above.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram illustrating an implementation environment for an optional coaxial cable protection circuit, as shown in an exemplary embodiment of this application; Figure 2 A schematic diagram of an optional coaxial cable protection circuit is shown for an exemplary embodiment of this application; Figure 3 A schematic diagram of another optional coaxial cable protection circuit is shown as an exemplary embodiment of this application; Figure 4A A schematic diagram of the structure of the coaxial cable protection circuit at the host end of an on-board PoC system, as shown in an exemplary embodiment of this application; Figure 4B A schematic diagram of the coaxial cable protection circuit at the sensor end in an on-board PoC system, as shown in an exemplary embodiment of this application; Reference numerals: 10-Coaxial cable, 11-First transmission terminal, 12-Second transmission terminal, 111-Power supply equipment, 112-First coaxial cable protection circuit, 121-Second coaxial cable protection circuit, 122-Load equipment, 21-Signal processing module, 22-DC blocking module, 23-Coaxial cable connector, 24-Electromagnetic interference suppression module, 25-Voltage conversion module, 26-Electrostatic discharge protection module, 31-First electrostatic discharge protection module, 32-Second electrostatic discharge protection module, 400-Main unit, 40-DC power supply, 41-Voltage conversion circuit, 42-Filter, 43-Deserializer, 44-First capacitor, 45-Second capacitor, 46-Bleeding resistor, 47-Feedthrough filter, 48-Connector, 49-First electrostatic impedance device, 50-Second electrostatic impedance device, 51-Serializer, 52-Sensor power circuit, 500-Sensor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0021] In the following text, the terms "first," "second," etc., are used only to distinguish similar objects and do not constitute a limitation on the order or sequence of similar objects. They are used for descriptive purposes only and should not be construed as implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified with "first" or "second" may explicitly or implicitly include one or more of that feature. The variations of "including" and "having," etc., indicate that the scope covered by the subject of the word is not exclusive, except for the examples shown by the word.

[0022] It is understood that the various numerical designations, step numbers, and other identifiers recorded in this application are for descriptive convenience and are not intended to limit the scope of this application. The size of the identifiers in this application does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

[0023] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0024] Traditional single-ended PoC protection circuits have a simple structure and a single protection system, usually only equipped with basic surge protection devices. They are unable to effectively resist multiple threats such as electrostatic discharge, surge and electromagnetic interference, and cannot purify the noise interference of vehicle loads. As a result, high-frequency video signals are severely reflected and attenuated, which can easily cause image distortion. Therefore, the coaxial cable signal transmission in traditional single-ended PoC protection circuits has weak anti-interference ability, high failure rate, and is difficult to operate stably for a long time under the complex electromagnetic conditions of vehicles.

[0025] Therefore, embodiments of this application provide a coaxial cable protection circuit, a coaxial cable transmission system, and a vehicle, which will be described in detail below.

[0026] Please see Figure 1 , Figure 1 This is a schematic diagram of an implementation environment for the coaxial cable protection circuit provided in this application embodiment.

[0027] like Figure 1 As shown, the implementation environment includes a first transmission terminal 11 and a second transmission terminal 12 that are connected by a coaxial cable 10. The first transmission terminal 11 includes a power supply device 111 and a first coaxial cable protection circuit 112, and the second transmission terminal 12 includes a second coaxial cable protection circuit 121 and a load device 122.

[0028] Schematic, the first coaxial cable protection circuit 112 and the second coaxial cable protection circuit 121 have the same structure, and each can include: a signal processing module, a DC blocking module, a coaxial cable connector, an electromagnetic interference suppression module, a voltage conversion module, and at least one electrostatic discharge (ESD) protection module. The signal processing module has its non-inverting pin connected to the coaxial cable connector via the DC blocking module. The coaxial cable connector is connected to the coaxial cable. The electromagnetic interference suppression module is connected on the connection line between the DC blocking module and the coaxial cable connector. The at least one ESD protection module has its first end connected to the connection line between the non-inverting pin of the signal processing module and the coaxial cable connector, and its second end grounded. The voltage conversion module has its first end connected to a power supply device or a load device, and its second end connected to the connection line between the DC blocking module and the electromagnetic interference suppression module.

[0029] This coaxial cable protection circuit includes an electromagnetic interference suppression module and at least one electrostatic discharge (ESD) protection module in the circuit between the signal processing module and the coaxial cable connector. The electromagnetic interference suppression module suppresses electromagnetic interference, and the at least one ESD protection module suppresses ESD interference and / or surge interference, thereby suppressing conducted and radiated interference during coaxial cable signal transmission, reducing the failure rate of coaxial cable signal transmission, and improving the anti-interference capability and operational stability of coaxial cable signal transmission.

[0030] In one example, taking the on-board PoC system in a new energy vehicle as an example, the first transmission terminal 11 can be the host end or the electronic control unit (ECU) end, the power supply device 111 can be a DC power supply or a battery, the signal processing module in the first coaxial cable protection circuit 112 can be a deserializer, the second transmission terminal 12 can be the sensor end, the signal processing module in the second coaxial cable protection circuit 121 can be a serializer, and the load device 122 can be a camera, radar, or other sensors.

[0031] In some implementations, at the host or ECU end, the host or ECU outputs parallel control signals for the sensor (e.g., configuration parameters, sensor wake-up, sensor sleep, etc.) to a deserializer. The deserializer converts the parallel control signals into serial control signals and outputs them through a non-inverting pin. A voltage conversion module outputs a voltage signal. The serial control signal and the voltage signal are combined and superimposed on the connection line between the DC blocking module and the coaxial cable connector, and then transmitted to the sensor end via the coaxial cable. Additionally, the deserializer also receives serial data transmitted from the sensor end through a coaxial cable protection circuit, converts the received serial data into parallel data, and provides the converted parallel data to the host or ECU for processing.

[0032] At the sensor end, the superimposed signal sent by the host or ECU end is received through the coaxial cable protection circuit. Since the DC blocking module can block DC signals, the superimposed signal is separated at the DC blocking module. The voltage signal powers the sensor through the voltage conversion module, and the serial control signal is input to the serializer. The serializer then converts the serial control signal into a parallel control signal and sends the parallel control signal to the sensor to control the sensor to perform corresponding configurations or actions. In addition, the serializer also converts the parallel data collected by the sensor into serial data and sends the converted serial data to the host or ECU end through the coaxial cable.

[0033] Of course, the new energy vehicle application scenarios mentioned above are only used to illustrate the application scenarios of the coaxial cable protection circuit provided in the embodiments of this application, and are not intended to limit the application scenarios. The application scenarios may also include, but are not limited to: smart home application scenarios, communication and broadcasting scenarios, security monitoring scenarios, industrial camera and machine vision scenarios, medical imaging scenarios, Internet of Things scenarios, etc.

[0034] Please see Figure 2 , Figure 2 This is a schematic diagram illustrating the structure of a coaxial cable protection circuit according to an exemplary embodiment of this application. This coaxial cable protection circuit can be applied to... Figure 1 The implementation environment is shown. Figure 2 As shown, in an exemplary embodiment, the coaxial cable protection circuit includes: a signal processing module 21, a DC blocking module 22, a coaxial cable connector 23, an electromagnetic interference suppression module 24, a voltage conversion module 25, and at least one electrostatic discharge protection module 26. Figure 2 Taking one electrostatic discharge (ESD) protection module as an example (in some implementations, there may be multiple ESD protection modules), a detailed introduction to each module is as follows: The signal processing module 21, whose non-inverting pin is connected to the coaxial cable connector 23 through the DC blocking module 22, is used to perform serial / parallel conversion of sensor data and synthesis or separation of voltage signals.

[0035] In some embodiments of this application, the inverting pin of the signal processing module 21 can be grounded through a DC blocking capacitor and a bleeder resistor, which are connected in series.

[0036] In some embodiments of this application, taking the on-board PoC system in a new energy vehicle as an example, when the signal processing module 21 is a deserializer, it is located at the host or ECU end. On the one hand, it receives parallel control signals for the sensor output from the host or ECU and converts the parallel control signals into serial control signals, which are then output through a non-inverting pin. On the other hand, the deserializer receives serial data transmitted by the sensor end through a coaxial cable. This serial data is obtained by the serializer at the sensor end converting the parallel data collected by the sensor. The deserializer converts the received serial data into parallel data and provides the converted parallel data to the host or ECU for processing.

[0037] The serial control signal and voltage signal output by the deserializer are combined and superimposed on the connection line between the DC blocking module and the coaxial cable connector, and sent to the sensor end through the coaxial cable. The voltage signal is obtained by the voltage conversion module 25 through boost conversion or buck conversion of the voltage signal output by the car battery.

[0038] When the signal processing module 21 is a serializer, it is located at the sensor end. After the sensor end receives the superimposed signal sent by the host end or ECU end through the coaxial cable, the superimposed signal is separated at the DC blocking module 22 because the DC blocking module 22 can block the DC signal. The voltage signal in the superimposed signal powers the sensor through the voltage conversion module 25, and the serial control signal in the superimposed signal is input to the serializer.

[0039] The serializer has two functions: firstly, it receives serial control signals, converts them into parallel control signals, and sends these parallel control signals to the sensor to control the sensor to perform corresponding configurations or actions; secondly, it converts parallel data from the sensor into serial data and sends the converted serial data to the host or ECU via a coaxial cable.

[0040] Electromagnetic interference suppression module 24 is connected to the connection line between DC blocking module 22 and coaxial cable connector 23, and is used to suppress electromagnetic interference.

[0041] In some embodiments of this application, the electromagnetic interference suppression module 24 may use a feedthrough filter, with the first end of the feedthrough filter connected to the DC blocking module 22, the second end connected to the coaxial cable connector 23, and the third and fourth ends of the feedthrough filter grounded respectively.

[0042] By setting a feedthrough filter on the connection line between the DC blocking module and the coaxial cable connector, the discharge path of electrostatic interference and surge interference can be shortened. Furthermore, since the third and fourth terminals of the feedthrough filter are both grounded, it provides extremely low impedance to ground for common-mode noise, which can be filtered out in advance before the interference enters the signal processing module, thus blocking the interference propagation path.

[0043] In some embodiments of this application, the feedthrough filter may adopt a through-shield structure as a dedicated interface for wires to enter and exit the shield, so as to prevent internal high-frequency noise leakage while resisting the intrusion of strong external interference.

[0044] At least one electrostatic discharge protection module 26 has a first end connected to the connection line between the non-inverting pin of the signal processing module 21 and the coaxial cable connector 23, and a second end grounded, for suppressing electrostatic interference and / or surge interference.

[0045] Among them, electrostatic interference refers to high-voltage pulse signals that occur within a very short time, while surge interference refers to high-energy overvoltage or overcurrent surges that last for a longer period of time.

[0046] In some embodiments of this application, one electrostatic discharge (ESD) protection module 26 may be used to suppress ESD interference and / or surge interference, or multiple ESD protection modules 26 may be used to suppress ESD interference and / or surge interference, depending on actual needs.

[0047] In one example, when there are multiple electrostatic discharge protection modules 26, at least one first end of an electrostatic discharge protection module 26 is connected to the connection line between the non-inverting pin of the signal processing module 21 and the DC blocking module 22, and to the connection line between the electromagnetic interference suppression module 24 and the coaxial cable connector 23.

[0048] Taking a coaxial cable protection circuit that includes two electrostatic discharge protection modules as an example, such as Figure 3 As shown, the first end of the first electrostatic discharge protection module 31 is connected to the connection line between the non-inverting pin of the signal processing module 21 and the DC blocking module 22, and the second end is grounded; the first end of the second electrostatic discharge protection module 32 is connected to the connection line between the electromagnetic interference suppression module 24 and the coaxial cable connector 23, and the second end is grounded.

[0049] In some embodiments of this application, the electrostatic discharge (ESD) protection module may use various electrostatic discharge (ESD) components, including one or more of the following: transient voltage suppression diodes, varistors, Zener diodes, and gas discharge tubes.

[0050] The voltage conversion module 25 has a first end connected to the power supply equipment or load equipment, and a second end connected to the connection line between the DC blocking module 22 and the electromagnetic interference suppression module 24, and is used for voltage conversion.

[0051] In some embodiments of this application, when the voltage conversion module 25 is connected to a power supply device, such as a DC power supply or a battery, it is used to convert the voltage signal provided by the power supply device and transmit the converted voltage signal to the PoC circuit; when the voltage conversion module 25 is connected to a load device, it is used to convert the received voltage signal and provide the converted voltage signal to the load device.

[0052] In some examples, the voltage conversion module 25 may be a boost circuit and / or a buck circuit, and the specific structure of this application embodiment is not limited.

[0053] In some embodiments of this application, the coaxial cable protection circuit further includes: a filtering module, the first end of which is connected to the voltage conversion module, and the second end of which is connected to the connection line between the DC blocking module and the electromagnetic interference suppression module, for filtering the voltage signal input to the voltage conversion module or the voltage signal output by the voltage conversion module.

[0054] In some examples, the filter module may be an inductor or a filter circuit containing an inductor, used to pass DC and block AC.

[0055] In some embodiments of this application, the DC blocking module includes a single capacitor or multiple capacitors connected in series.

[0056] The various parts of the coaxial cable protection circuit provided in one embodiment of this application have been described in detail above. The coaxial cable protection circuit provided in this embodiment includes an electromagnetic interference suppression module and at least one electrostatic discharge (ESD) protection module in the circuit between the signal processing module and the coaxial cable connector. The electromagnetic interference suppression module suppresses electromagnetic interference, and the at least one ESD protection module suppresses ESD interference and / or surge interference. When multiple ESD protection modules are used, multi-level ESD protection can be formed. By cooperating with the electromagnetic interference suppression module and multi-level ESD protection, electromagnetic interference, ESD interference, and surge interference are suppressed in stages, thereby effectively suppressing conducted and radiated interference during coaxial cable signal transmission, reducing the operational failure rate of coaxial cable signal transmission, and improving the anti-interference capability and operational stability of coaxial cable signal transmission.

[0057] In one example, when the coaxial cable protection circuit is applied to the host side of an on-board PoC system, taking the electromagnetic interference suppression module as a feedthrough filter as an example, its structure is as follows: Figure 4A As shown, it includes: a host 400, a DC power supply 40, a voltage conversion circuit 41, a filter 42, a deserializer 43, a first capacitor 44, a second capacitor 45, a bleeder resistor 46, a feedthrough filter 47, a connector 48, a first electrostatic impedance 49, and a second electrostatic impedance 50.

[0058] In this circuit, one end of the voltage conversion circuit 41 is connected to the DC power supply 40, and the other end is connected to one end of the filter 42. The other end of the filter 42 is connected to the second end of the first capacitor 44. The deserializer 43 is communicatively connected to the host 400. The non-inverting serial-data input / output positive (SIOP) pin of the deserializer 43 is connected to the first end of the first capacitor 44, and the inverting serial-data input / output negative (SION) pin of the deserializer 43 is grounded through the second capacitor 45 and the bleeder resistor 46 connected in series. The second end of the first capacitor 44 is connected to the first end of the feedthrough filter 47, and also to one end of the filter 42.

[0059] The second end of the feedthrough filter 47 is connected to connector 48, and the third and fourth ends of the feedthrough filter 47 are grounded respectively. One end of the first electrostatic resistor 49 is connected to SIOP of the deserializer 43, and the other end is grounded. One end of the second electrostatic resistor 50 is connected to the second end of the feedthrough filter 47, and the other end is grounded.

[0060] exist Figure 4AIn the coaxial cable protection circuit shown, the second electrostatic impedance 50 forms the first level of protection. Located near the coaxial cable connector, it discharges external surges and static electricity, clamps high voltage and high energy to a safe voltage, and blocks most transient impacts from entering subsequent circuits. The feedthrough filter 47 forms the second level of protection, filtering out residual high-frequency interference and RF spikes, cutting off the propagation path of transient interference, attenuating the amplitude of residual pulses, achieving energy buffering, and simultaneously filtering out ripple noise on the DC power supply. The first electrostatic impedance 49 forms the third level of protection. Located near the deserializer 43, it precisely limits the voltage of the remaining small residual pulses after attenuation, protecting the deserializer 43, and simultaneously dissipating internal interference. Through the cooperation of these three levels of protection circuits, the deserializer 43 is protected.

[0061] Specifically, static electricity and surges are preferentially discharged by the second electrostatic impedance device. Residual high-frequency interference enters the ground through the feedthrough filter to achieve port signal filtering. Residual low-frequency pulses are clamped by the first electrostatic impedance device. Through the cooperation of three-level protection circuits, conducted interference and radiated interference are filtered out from the source, reducing the failure rate of coaxial cable signal transmission and improving the anti-interference capability and operational stability of coaxial cable signal transmission.

[0062] Because the feedthrough filter enables both DC power input and high-frequency signal pass-through, the aforementioned coaxial cable protection circuit exhibits no impedance drop, reducing signal reflection and waveform distortion, optimizing the integrity of high-speed signals, and ensuring the transmission quality of the Gigabit Multimedia Serial Link (GMSL). When applied to an automotive PoC system, this coaxial cable protection circuit effectively controls low-frequency and high-frequency interference, significantly improving the electromagnetic compatibility (EMC) test pass rate of the automotive PoC circuit, enhancing overall EMC performance, and effectively preventing power switching noise from coupling into the GMSL high-speed signal.

[0063] The following is combined with Figure 4A This section provides a brief explanation of the signal reception and transmission process on the host side.

[0064] On the host side, the deserializer 43 is communicatively connected to the host 400. The deserializer 43 receives parallel control signals for the sensor output from the host 400 and converts these parallel control signals into serial control signals, which are then output through a non-inverting pin. The serial control signal and voltage signal output by the deserializer 43 converge and superimpose on the connection line between the first capacitor 44 and the connector 48, forming a superimposed signal. This superimposed signal is transmitted to the sensor end via a coaxial cable. The voltage signal is obtained by the voltage conversion circuit 41 through either boost or buck conversion of the voltage signal output from the DC power supply 40.

[0065] On the other hand, the deserializer 43 receives serial data sent by the sensor end through a coaxial cable. This serial data is obtained by the serializer at the sensor end converting the parallel data collected by the sensor. The deserializer 43 converts the received serial data into parallel data and provides the converted parallel data to the host 400 for processing.

[0066] In another example, when a coaxial cable protection circuit is applied to the sensor end of an on-board PoC system, taking the electromagnetic interference suppression module as a feedthrough filter as an example, its structure is as follows: Figure 4B As shown, it includes: sensor 500, voltage conversion circuit 41, filter 42, first capacitor 44, second capacitor 45, bleeder resistor 46, feedthrough filter 47, connector 48, first electrostatic impedance 49, second electrostatic impedance 50, serializer 51, and sensor power circuit 52.

[0067] In this circuit, one end of the voltage conversion circuit 41 is connected to the sensor power circuit 52, and the other end is connected to one end of the filter 42. The other end of the filter 42 is connected to the second end of the first capacitor 44. The SIOP of the serializer 51 is connected to the first end of the first capacitor 44, and the SION of the serializer 51 is grounded through the second capacitor 45 and the bleeder resistor 46 connected in series. The serializer 51 is communicatively connected to the sensor 500, which is powered by the sensor power circuit 52. The second end of the first capacitor 44 is connected to the first end of the feedthrough filter 47, and also to one end of the filter 42.

[0068] The second end of the feedthrough filter 47 is connected to connector 48, and the third and fourth ends of the feedthrough filter 47 are grounded respectively. One end of the first electrostatic resistor 49 is connected to SIOP of the serializer 51, and the other end is grounded. One end of the second electrostatic resistor 50 is connected to the second end of the feedthrough filter 47, and the other end is grounded.

[0069] exist Figure 4B In the coaxial cable protection circuit shown, the serializer 51 separates the voltage signal and the data signal from the received signal, and uses the voltage signal to power the sensor. Its principle of suppressing electromagnetic interference, electrostatic interference and surge interference is the same as that of the host or ECU, and will not be described again here.

[0070] The following is combined with Figure 4B This section provides a brief explanation of the process of receiving and transmitting signals at the sensor end.

[0071] At the sensor end, after receiving the superimposed signal sent by the host end through the coaxial cable, the superimposed signal is separated at the first capacitor 44 because the first capacitor 44 can block the DC signal. The voltage signal in the superimposed signal is used to power the sensor through the filter 42, the voltage conversion circuit 41, and the sensor power circuit 52. The serial control signal in the superimposed signal is input to the serializer 51.

[0072] The serializer 51 receives serial control signals, converts them into parallel control signals, and sends the parallel control signals to the sensor 500 to control the sensor 500 to perform corresponding configurations or actions. On the other hand, the serializer 51 converts parallel data from the sensor 500 into serial data and sends the converted serial data to the host computer via a coaxial cable.

[0073] Based on the same concept, some embodiments of this application provide a coaxial cable transmission system, including a first transmission terminal and a second transmission terminal connected by coaxial cable communication. The first transmission terminal includes a power supply device and a coaxial cable protection circuit provided in some embodiments of this application, and the second transmission terminal includes a load device and a coaxial cable protection circuit provided in some embodiments of this application.

[0074] Based on the same concept, some embodiments of this application provide a vehicle, characterized in that it includes a vehicle body and a coaxial cable transmission system provided in some embodiments of this application.

[0075] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0076] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A coaxial cable protection circuit, characterized in that, include: The system includes a signal processing module, a DC blocking module, a coaxial cable connector, an electromagnetic interference suppression module, a voltage conversion module, and at least one electrostatic discharge (ESD) protection module. The signal processing module has its non-inverting pin connected to the coaxial cable connector via the DC blocking module. The electromagnetic interference suppression module is connected to the connection line between the DC blocking module and the coaxial cable connector. The at least one electrostatic discharge protection module has its first end connected to the connection line between the non-inverting pin of the signal processing module and the coaxial cable connector, and its second end grounded. The voltage conversion module has its first end connected to the power supply equipment or load equipment, and its second end connected to the connection line between the DC blocking module and the electromagnetic interference suppression module.

2. The circuit according to claim 1, characterized in that, The electrostatic discharge protection module comprises multiple modules. At least one first end of the electrostatic discharge protection module is connected to the connection line between the non-inverting pin of the signal processing module and the DC blocking module, and the connection line between the electromagnetic interference suppression module and the coaxial cable connector.

3. The circuit according to claim 1, characterized in that, The electrostatic discharge protection module includes one or more of the following: transient voltage suppression diode, varistor, Zener diode, and gas discharge tube.

4. The circuit according to claim 1, characterized in that, The circuit further includes a filter module, with its first end connected to the voltage conversion module and its second end connected to the connection line between the DC blocking module and the electromagnetic interference suppression module.

5. The circuit according to any one of claims 1-4, characterized in that, The voltage conversion module includes: a boost circuit and / or a buck circuit.

6. The circuit according to any one of claims 1-4, characterized in that, The DC blocking module includes a single capacitor or multiple capacitors connected in series.

7. The circuit according to any one of claims 1-4, characterized in that, The electromagnetic interference suppression module includes a feedthrough filter. The first end of the feedthrough filter is connected to the DC blocking module, the second end is connected to the coaxial cable connector, and the third and fourth ends of the feedthrough filter are grounded respectively.

8. The circuit according to any one of claims 1-4, characterized in that, The signal processing module includes a deserializer or a serializer.

9. A coaxial cable transmission system, characterized in that, The device includes a first transmission terminal and a second transmission terminal connected via a coaxial cable. The first transmission terminal includes a power supply device and a coaxial cable protection circuit as described in any one of claims 1-8. The second transmission terminal includes a load device and a coaxial cable protection circuit as described in any one of claims 1-8.

10. A vehicle, characterized in that, It includes the vehicle body and the coaxial cable transmission system as described in claim 9.

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