T-Box, relay, signal transmission system and vehicle

Abstract

The embodiment of the invention provides a T-Box, a relay, a signal transmission system and a vehicle, relates to the technical field of communication, and is used for synchronously sending a radio frequency signal and a control signal to the relay through a cable by the T-Box. A first branch circuit in the T-Box comprises a V2X circuit and a first radio frequency conduction circuit, and the first radio frequency conduction circuit is coupled between the V2X circuit and a first combining point. The second branch comprises a first control signal end and a first radio frequency isolation circuit, and the first radio frequency isolation circuit is coupled between the first control signal end and the first combining point; the first control signal end outputs a control signal. A fourth branch in the relay comprises a V2X signal end of any thing in vehicle connection and a bidirectional switch circuit, the bidirectional switch circuit comprises a first path and a second path which are coupled between the V2X signal end and the third combining point in parallel, and the first path comprises a first power amplifier. The fifth branch comprises a second control signal end coupled with the bidirectional switching circuit; the second control signal end receives a control signal to control the gain of the first power amplifier.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a T-Box, a relay, a signal transmission system and a vehicle. Background Art

[0002] The vehicle to everything (V2X) system is a new generation of information and communication technology that connects vehicles to everything. Vehicles rely on telematics boxes (T-Boxes) that support V2X technology as V2X information transceivers, and can form a V2X system with other things based on a mature communication network architecture to achieve V2X communication.

[0003] Since the distance between the vehicle's external antenna and the T-Box is relatively long, and the higher the frequency, the greater the attenuation of the RF signal, the excessive attenuation will cause the RF performance of the vehicle to be seriously degraded. In order to alleviate the attenuation problem, technicians in this field have proposed using a relay to alleviate the attenuation. The relay will amplify and forward the signal to increase the transmission capacity of the RF signal.

[0004] However, in current technology, the T-Box cannot send control signals to the relay, resulting in the relay having no dynamic adjustment capabilities, such as the ability to dynamically adjust the gain, which results in the signal transmission system composed of the T-Box and the relay being unable to dynamically match different vehicle models. Summary of the invention

[0005] The embodiments of the present application provide a T-Box, a relay, a signal transmission system and a vehicle, which are used to enable the T-Box to synchronously send a radio frequency signal and a control signal to the relay through a cable.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect of an embodiment of the present application, a T-Box is provided, wherein the T-Box includes a first branch and a second branch, wherein the first branch includes a vehicle-to-anything V2X circuit and a first RF conduction circuit, wherein the first RF conduction circuit is coupled between the V2X circuit and a first junction point; the V2X circuit is used to send RF signals when the T-BOX is used to send signals, and to receive RF signals when the T-BOX is used to receive signals. The second branch includes a first control signal terminal and a first RF isolation circuit, wherein the first RF isolation circuit is coupled between the first control signal terminal and the first junction point; the first control signal terminal is used to output a control signal; the first RF conduction circuit is used to pass RF signals and isolate control signals, and the first RF isolation circuit is used to pass control signals and isolate RF signals.

[0008] In the T-Box provided in the embodiment of the present application, the radio frequency signal transmitted by the first branch is used for V2X communication, and the control signal transmitted by the second branch is used to control the relay, and the control signal can carry any information related to the control relay. The embodiment of the present application aggregates the control signal and the radio frequency signal by adopting a circuit structure, so that the T-Box can synchronously output the control signal when outputting the radio frequency signal, and the control signal can be used to control the relay to adjust the gain and other parameters. When the T-Box is applied to the signal transmission system, the T-Box can synchronously transmit the radio frequency signal and the control signal to the relay through the cable, without excessively increasing the complexity of the signal transmission system, but can enable the relay to dynamically adjust its own parameters according to the control signal to match different vehicle models. Moreover, it is found through simulation that while synchronously transmitting the control signal, the loss of the radio frequency signal transmitted by the V2X circuit is low, and the radio frequency performance of the T-Box is hardly affected. In addition, the embodiment of the present application realizes the aggregation of the control signal and the radio frequency signal through the T-Box itself, and realizes the synchronous transmission of the control signal and the radio frequency signal through a cable through a hardware circuit solution, without the need to add additional large-size devices, reducing costs, meeting the needs of miniaturization, and can be applied to vehicles. For example, the control signal can carry information related to adjusting the relay gain, so as to adjust the relay gain according to different application scenarios to adapt to different cable attenuation, so that a set of signal transmission systems can be adapted to multiple vehicle models. Or, for example, the control signal can carry information related to informing the relay to send and receive signals, so as to adjust the relay's sending and receiving according to different application states.

[0009] In a possible implementation, the first radio frequency isolation circuit includes a (1 / 4+N / 2)λ transmission line; the first end of the (1 / 4+N / 2)λ transmission line is coupled to the first junction point, the second end of the (1 / 4+N / 2)λ transmission line is coupled to the first node; the first node is coupled to the first control signal end; wherein λ is the wavelength of the radio frequency signal, and N is an integer greater than or equal to 0. The isolation of multiple radio frequency signals is achieved through the transmission line, the structure is simple, and the occupied area is small.

[0010] In a possible implementation, the T-Box further includes a circuit board, and the (1 / 4+N / 2)λ transmission line is integrated inside the circuit board. In this way, the T-Box occupies a small area and has a low cost.

[0011] In a possible implementation, the first RF isolation circuit further includes a first capacitor and a second capacitor; the first end of the first capacitor and the first end of the second capacitor are both coupled to the reference ground voltage terminal, and the second end of the first capacitor and the second end of the second capacitor are both coupled to the first node. By setting the first capacitor and the second capacitor, the frequency band deviation caused by the processing error of the (1 / 4+N / 2)λ transmission line can be compensated, and the isolation effect of the RF signal can be optimized.

[0012] In a possible implementation, the first radio frequency isolation circuit includes an isolator. In this way, the first radio frequency isolation circuit is a finished device and can be directly coupled to the T-Box, which is simple in design.

[0013] In a possible implementation, the T-Box also includes a third branch; the third branch includes a first power supply circuit, the first power supply circuit is coupled to a second junction point, and the second junction point is located between the first RF isolation circuit and the first control signal terminal. Then, the signal aggregated in the first junction point includes a RF signal, a control signal, and a power supply current. Through a hardware circuit solution, a cable can simultaneously transmit RF signals, control signals, and power supply current without the need to introduce additional large-size devices, which has great market prospects.

[0014] In a possible implementation, the first branch further includes a first AC conduction and DC isolation circuit, and the first AC conduction and DC isolation circuit is coupled in series with the first RF conduction circuit between the V2X circuit and the first combining point.

[0015] By setting the first AC-DC blocking circuit in the first branch, the RF signal can pass through the first AC-DC blocking circuit, but the power supply current at the first junction cannot be transmitted to the V2X circuit through the first AC-DC blocking circuit. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference to the RF signal transmitted by the first branch can be reduced.

[0016] In a possible implementation, the first AC-passing and DC-isolating circuit includes a first DC-isolating capacitor. In this way, the structure of the first AC-passing and DC-isolating circuit is simple, and the area occupied by the T-Box is small.

[0017] In a possible implementation, the second branch further includes a second AC-passing and DC-isolating circuit, and the second AC-passing and DC-isolating circuit is coupled between the first control signal terminal and the second combining point.

[0018] By providing a second AC-isolating DC-isolating circuit in the second branch, the power supply current can be prevented from being transmitted in the second branch. In other words, the power supply current will not be transmitted to the first control signal terminal. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference to the control signal transmitted by the second branch can be reduced.

[0019] In a possible implementation, the second AC-passing and DC-isolating circuit includes a second DC-isolating capacitor. In this way, the second AC-passing and DC-isolating circuit has a simple structure and the occupied area of ​​the T-Box is small.

[0020] In a possible implementation, the third branch further includes a first DC-passing and AC-isolating circuit, and the first DC-passing and AC-isolating circuit is coupled between the first power supply circuit and the second junction.

[0021] The power current output by the first power circuit in the third branch is transmitted to the first junction point, but the power current is isolated by the first AC-passing and DC-isolating circuit and will not be transmitted to the first branch. At the same time, the power current is isolated by the second AC-passing and DC-isolating circuit and will not be transmitted to the second branch, and there will be almost no loss of power current. The first DC-passing and AC-isolating circuit can also isolate the control signal in the second branch to reduce the loss of the control signal.

[0022] In a possible implementation, the first direct-current-isolating-alternating-circuit includes an equivalent inductor. In this way, the structure of the first direct-current-isolating-alternating-circuit is simple, and the area occupied by the T-Box is small.

[0023] In a possible implementation, the first control signal terminal includes a first gain control signal terminal and a first transceiver control signal terminal. In this way, the T-Box can synchronously transmit the gain control signal and the transceiver control signal to the relay, thereby optimizing the performance of the T-Box.

[0024] In a possible implementation, the second branch further includes a first controller, which is configured to output a first gain control signal to the first gain control signal terminal after receiving the transceiver control signal from the first transceiver control signal terminal. The first controller can output the first gain control signal according to the transceiver control signal to control the gain value of the relay.

[0025] In a possible implementation, the first controller is coupled to the first gain control signal terminal and the first transceiver control signal terminal, and the V2X circuit is coupled to the first transceiver control signal terminal. The first controller transmits the first gain control signal, and the first gain control signal can be adjusted to adapt to different application scenarios.

[0026] In a possible implementation, the second branch further includes a modulation circuit; the input end of the modulation circuit is coupled to the first gain control signal end and the first transceiver control signal end, and the output end of the modulation circuit is coupled to the first RF isolation circuit. In this way, one signal can carry multiple information, simplify the structure of the T-Box, and optimize the performance of the T-Box.

[0027] In a possible implementation, the second branch further includes a carrier circuit, which is used to output a carrier signal; the carrier circuit is coupled to the input end of the modulation circuit. By setting the carrier signal to carry and transmit the control signal, the transmission effect of the control signal can be improved by assisting the transmission of the control signal.

[0028] In a possible implementation, the carrier circuit includes a clock oscillator. Using a clock signal as a carrier signal can easily separate the clock signal from the control signal after receiving the modulated signal, and data is not easily lost during separation.

[0029] In a possible implementation, the modulation circuit includes a first AND gate; an input end of the first AND gate is coupled to a first gain control signal end, a first transceiver control signal end, and a carrier circuit, and an output end of the first AND gate is coupled to a first radio frequency isolation circuit. The three-way signal is modulated in the form of three AND gates, which has a simple structure and occupies a small area.

[0030] In a possible implementation, the modulation circuit includes a second AND gate and a third AND gate; the input end of the second AND gate is coupled to the first gain control signal end, the first transceiver control signal end and two of the carrier circuit, and the output end of the second AND gate is coupled to the input end of the third AND gate; the input end of the third AND gate is also coupled to the first gain control signal end, the first transceiver control signal end and the remaining one of the carrier circuit, and the output end of the third AND gate is coupled to the first RF isolation circuit. The three-way signal is modulated in the form of a two-level dual AND gate, and the principle is simple.

[0031] In a possible implementation, the second branch further includes an operational amplifier, which is coupled between the modulation circuit and the first RF isolation circuit. By providing an operational amplifier at the output end of the modulation circuit, the signal modulated by the modulation circuit can be amplified / attenuated and then transmitted to the first summing point to meet the needs of different application scenarios.

[0032] In a possible implementation, the first radio frequency conduction circuit includes a bandpass filter. This is an implementation with a simple structure, mature technology and low cost.

[0033] In a second aspect of an embodiment of the present application, a relay is provided, and the relay includes a fourth branch and a fifth branch. The fourth branch includes a vehicle-to-anything V2X signal terminal and a bidirectional switch circuit, the bidirectional switch circuit includes a first path and a second path coupled in parallel between the V2X signal terminal and a third junction, the first path includes a first power amplifier, and the output of the first power amplifier is coupled to the V2X signal terminal; the V2X signal terminal is used to send a radio frequency signal when the relay is used to send a signal, and to receive a radio frequency signal when the relay is used to receive a signal; the fifth branch includes a second control signal terminal and a second radio frequency isolation circuit, the second control signal terminal is coupled to the bidirectional switch circuit; the second radio frequency isolation circuit is coupled between the second control signal terminal and the third junction; the second control signal terminal is used to receive a control signal; and the second radio frequency isolation circuit is used to pass the control signal and isolate the radio frequency signal.

[0034] The relay provided in the embodiment of the present application controls and adjusts the relay itself in combination with the control signal after receiving the control signal sent by the T-Box, so that the relay has a dynamically adjustable function to meet the needs of different application scenarios. In the case where the control signal includes a first gain control signal, the relay can adjust its own gain value in combination with the first gain control signal to adapt to the line loss in different vehicles. In this way, a signal transmission system can be adapted to different types of vehicles, with high adaptability and low cost.

[0035] In a possible implementation, the second control signal terminal includes a second gain control signal terminal and a second transceiver control signal terminal; the second gain control signal terminal is coupled to the first power amplifier, and the second transceiver control signal terminal is coupled to the first path and the second path, respectively. In this way, the signals that the relay can identify include the gain control signal and the transceiver control signal, and are controlled by these signals to optimize the performance of the relay.

[0036] In a possible implementation, the fifth branch also includes a second controller and a first frequency band blocking circuit; the first frequency band blocking circuit is coupled between the second transceiver control signal terminal and the second node, and the second node is coupled to the second RF isolation circuit; the second controller is configured to output a second gain control signal to the second gain control signal terminal after receiving the transceiver control signal of the second transceiver control signal terminal and the control signal of the second node. The second controller generates a second gain control signal according to the control signal containing the first gain control signal sent by the T-BOX and the separated transceiver control signal, and transmits the second gain control signal to the first power amplifier to control the gain of the first power amplifier.

[0037] In a possible implementation, the output end of the second controller is coupled to the second gain control signal end, and the input end of the second controller is coupled to the second transceiver control signal end and the second node. This method separates the modulated signal output by the T-Box, has a simple structure, and has low signal loss.

[0038] In a possible implementation, the fifth branch further includes a second frequency band blocking circuit, and the second frequency band blocking circuit is coupled between the second node and the second RF isolation circuit. In the case where the modulated signal includes a carrier signal, the relay may first block the carrier signal, thereby simplifying the separation method of the modulated signal.

[0039] In a possible implementation, the fifth branch further includes a first signal enhancement circuit, which is coupled between the second controller and the second node. By setting the first signal enhancement circuit between the second controller and the second node, the signal of the second node can be enhanced before being transmitted to the second controller, so as to improve the accuracy of signal processing.

[0040] In a possible implementation, the fifth branch further includes a second signal enhancement circuit, which is coupled between the second controller and the second transceiver control signal terminal. By providing the second signal enhancement circuit between the second controller and the second transceiver control signal terminal, the signal of the second transceiver control signal terminal can be enhanced before being transmitted to the second controller, so as to improve the accuracy of the signal.

[0041] In a possible implementation, the fifth branch further includes a third signal enhancement circuit, which is coupled between the second node and the second RF isolation circuit. By providing the second signal enhancement circuit between the second node and the second RF isolation circuit, the signal output by the second RF isolation circuit can be enhanced before being transmitted to the second node, so as to improve the accuracy of the signal.

[0042] In a possible implementation, the relay also includes a power detector, which is coupled to the input end and the third combining point of the second controller respectively, and the second controller is also configured to receive a power signal sent by the power detector before outputting the second gain control signal to the second gain control signal end. The second controller outputs a second gain control signal based on the first gain control signal (characterizing the power strength of the RF signal output by the T-Box) and the power signal output by the power detector (characterizing the power strength of the RF signal after the cable line loss) to perform corresponding gain control on the first power amplifier. The gain value of the second gain control signal output by the second controller is different for different cable lengths, so that the signal transmission system has the function of adaptively adapting to different cable lengths, so that the signal transmission system provided in the embodiment of the present application can be applicable to vehicles with cables of various lengths.

[0043] In a possible implementation, the second RF isolation circuit includes a (1 / 4+N / 2)λ transmission line; the first end of the (1 / 4+N / 2)λ transmission line is coupled to the third junction point, the second end of the (1 / 4+N / 2)λ transmission line is coupled to the third node; the third node is coupled to the second control signal end; wherein λ is the wavelength of the RF signal, and N is an integer greater than or equal to 0. The isolation of multiple RF signals is achieved through the transmission line, the structure is simple, and the occupied area is small.

[0044] In a possible implementation, the relay further includes a circuit board, and the (1 / 4+N / 2)λ transmission line is integrated in the circuit board. In this way, the relay occupies a small area and has a low cost.

[0045] In a possible implementation, the second RF isolation circuit further includes a third capacitor and a fourth capacitor; the first end of the third capacitor and the first end of the fourth capacitor are both coupled to the reference ground voltage terminal, and the second end of the third capacitor and the second end of the fourth capacitor are both coupled to the third node. By setting the third capacitor and the fourth capacitor, the frequency band deviation caused by the processing error of the (1 / 4+N / 2)λ transmission line can be compensated, and the isolation effect of the RF signal can be optimized.

[0046] In a possible implementation, the second path includes a second power amplifier. The second power amplifier can amplify the signal transmitted by the second path to meet different requirements.

[0047] In a possible implementation, the relay further includes a sixth branch; the sixth branch includes a second power supply circuit, the second power supply circuit is coupled to a fourth junction point, and the fourth junction point is located between the second RF isolation circuit and the second control signal terminal. The relay includes the sixth branch, which can receive the power supply current sent by the T-Box to power the relay, has a simple structure, and is low in cost.

[0048] In a possible implementation, the fourth branch further includes a second RF conduction circuit, which is coupled between the bidirectional switch circuit and the third junction point. The second RF conduction circuit in the fourth branch can filter out signals of other frequency bands and reduce interference of out-of-band signals through RF signals.

[0049] In a possible implementation, the fourth branch further includes a third AC-DC-isolating circuit, which is coupled between the bidirectional switch circuit and the third junction point. The third AC-DC-isolating circuit can reduce the loss of power supply current on the one hand, and can reduce the interference to the radio frequency signal transmitted by the fourth branch on the other hand.

[0050] In a possible implementation, the third AC-passing and DC-isolating circuit includes a third DC-isolating capacitor. In this way, the structure of the third AC-passing and DC-isolating circuit is simple, and the area occupied by the relay is small.

[0051] In a possible implementation, the fifth branch further includes a fourth AC-DC-isolating circuit, which is coupled between the second control signal terminal and the fourth junction point. The fourth AC-DC-isolating circuit can reduce the loss of power supply current on the one hand, and reduce the interference to the control signal transmitted by the fifth branch on the other hand.

[0052] In a possible implementation, the fourth AC-passing and DC-isolating circuit includes a fourth DC-isolating capacitor. In this way, the structure of the fourth AC-passing and DC-isolating circuit is simple, and the area occupied by the relay is small.

[0053] In a possible implementation, the sixth branch further includes a second direct-through and alternating-through circuit, which is coupled between the second power supply circuit and the fourth junction point. The second direct-through and alternating-through circuit can isolate the control signal in the fifth branch and reduce the loss of the control signal.

[0054] In a possible implementation, the second direct-passing and alternating-isolating circuit includes an equivalent inductor. In this way, the second direct-passing and alternating-isolating circuit has a simple structure and the relay occupies a small area.

[0055] A third aspect of the embodiments of the present application provides a signal transmission system, comprising the T-Box of any one of the first aspect, a cable, and the relay of any one of the second aspect; one end of the cable is coupled to the first combining point of the T-Box, and the other end of the cable is coupled to the third combining point of the relay. The system provided by the embodiments of the present application comprises the T-Box of the first aspect and the relay of the second aspect, and its beneficial effects are the same as those of the T-Box and the relay, which will not be repeated here.

[0056] According to a fourth aspect of an embodiment of the present application, a vehicle is provided, comprising an antenna and the signal transmission system of the third aspect, wherein the signal transmission system is coupled to the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram of a V2X application scenario provided in an embodiment of the present application;

[0058] Figure 2 A framework diagram of a vehicle provided in an embodiment of the present application;

[0059] Figure 3-Figure 6 A schematic diagram of a T-Box framework provided in an embodiment of the present application;

[0060] Fig. 7A An architecture diagram of a transmission line network provided in an embodiment of the present application;

[0061] Figure 7B A method provided in the embodiment of the present application Figure 6 A simulation diagram of the isolation effect of the first radio frequency isolation circuit on the radio frequency signal;

[0062] Figure 7C Another embodiment of the present application provides Figure 6 A simulation diagram of the isolation effect of the first radio frequency isolation circuit on the radio frequency signal;

[0063] Figure 8-Figure 12 A schematic diagram of a T-Box framework provided in an embodiment of the present application;

[0064] Fig.13 A modulation result diagram of a modulation circuit provided in an embodiment of the present application;

[0065] Figure 14-Figure 20 A schematic diagram of a relay framework provided in an embodiment of the present application. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be 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, rather than all of the embodiments.

[0067] In the following, the terms "second", "first", etc. are used only for convenience of description and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "second", "first", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0068] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" may be defined including but not limited to the orientation relative to the schematic placement of the components in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative description and clarification, and may change accordingly according to changes in the orientation of the components in the drawings.

[0069] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. In addition, the term "coupled" can be a direct electrical connection or an indirect electrical connection through an intermediate medium. The term "contact" can be a direct contact or an indirect contact through an intermediate medium.

[0070] In the embodiments of the present application, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B may be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0071] First, to facilitate understanding, relevant terms and concepts that may be involved in the embodiments of the present application are introduced below.

[0072] (1) Vehicle to everything (V2X)

[0073] V2X is used to realize information exchange between vehicles and all entities that may affect the vehicles, so as to reduce accidents, ease traffic congestion, reduce environmental pollution and provide other information services. Figure 1 As shown in the figure, V2X consists of four parts: Vehicle to Network (V2N) communication is the most widely used form of vehicle networking. Its main function is to connect vehicles to cloud servers through mobile networks and use navigation, entertainment, anti-theft and other application functions provided by cloud servers. Vehicle to vehicle (V2V) communication can be used for information exchange and reminders between vehicles. The most typical application is the anti-collision safety system between vehicles. Vehicle to infrastructure (V2I) communication is that vehicles can communicate with roads and even other infrastructure, such as traffic lights and roadblocks, to obtain road management information such as traffic light signal timing. Vehicle to pedestrian (V2P) communication is used to give safety warnings to pedestrians or non-motor vehicles on the road.

[0074] At present, V2X technology can be the dedicated short range communication (DSRC) related to automobiles defined in 802.11p of the Institute of Electrical and Electronics Engineers (IEEE), or it can be the cellular vehicle network (C-V2X) technology based on cellular mobile communication technology defined by the 3rd Generation Partnership Project (3GPP). It should be clear that the application scenarios of the solution provided in the embodiment of the present application are not limited to the above two mainstream implementation methods (DSRC and C-V2X) in the current V2X technology. With the evolution of technology, other newly emerging V2X technology implementation methods do not exceed the application scenario coverage of the embodiment of the present application.

[0075] Judging from the current network situation and the technical advantages of C-V2X evolution, C-V2X should be the first choice for domestic V2X technical standards. C-V2X can be divided into two communication modes: direct mode (V2X-direct) and cellular mode (V2X-cellular) according to different interfaces. V2X-direct is based on the D2D (device-to-device) proximity communication service (ProSe) in the LTE standard. Through the PC5 interface, it uses the dedicated frequency band of the Internet of Vehicles (protocol defined as B47 5.9GHz) to achieve direct communication between vehicles, roads, and people. It has low latency and supports high mobile speeds, but requires good resource allocation and congestion control algorithms. In an environment without LTE network coverage, neighboring devices can communicate directly. V2X-cellular uses LTE broadcast, forwards through the UU interface of the cellular network, and uses the cellular network frequency band (protocol defined as: B3, B7, B8, B39, B41).

[0076] Based on V2X technology, vehicles share information through channels and expand their perception range to detect hidden threats and ensure that important warning information is pushed in a timely and correct manner at critical moments. V2X technology can not only help improve vehicle safety performance and improve road traffic efficiency, but also promote the development of autonomous driving technology.

[0077] (2) In-vehicle communication terminal (telematics Box, T-Box)

[0078] The vehicle-mounted T-Box is a communication component (or described as a device) in the vehicle-mounted information system. The vehicle-mounted T-Box is mainly used to communicate with other devices and / or other electronic devices in the vehicle to display vehicle information and control the vehicle using electronic devices. This component is pre-installed in the vehicle, accesses the mobile operator network through the built-in communication module, connects to the vehicle body network through the vehicle bus, connects to the vehicle computer through data channels such as Ethernet / wireless fidelity (Wi-Fi) / serial bus (universal serial bus, USB) interface, and shares mobile data with the driver and passengers in the vehicle through the vehicle computer Wi-Fi.

[0079] Figure 2 A framework diagram of a vehicle provided in an embodiment of the present application.

[0080] like Figure 2 As shown, an embodiment of the present application provides a vehicle 100, which includes a T-Box, a cable, a relay, and an antenna.

[0081] The T-Box is coupled to the antenna through a cable, and the V2X circuit in the T-Box transmits a radio frequency signal, which is transmitted between the T-Box and the antenna. Since the T-Box is usually installed in the front of the vehicle 100, and the antenna is usually installed in the rear of the vehicle 100, the distance between the T-Box and the antenna is usually far. The higher the frequency, the greater the attenuation of the radio frequency signal. Excessive attenuation causes a serious degradation of the radio frequency performance of the entire vehicle.

[0082] Based on this, Figure 2 As shown, a relay is added in the vehicle 100, and the relay is located between the T-Box and the antenna. The relay amplifies and forwards the RF signal, increases the transmission capacity of the RF signal, and weakens the attenuation of the RF signal.

[0083] The T-Box, cables, and relays constitute a signal transmission system, which is coupled to the antenna to enable the vehicle 100 to implement the V2X function.

[0084] However, since a T-Box needs to be adapted to a variety of vehicle models, the antenna and relay positions of each vehicle model are different, and the gain of the RF signal required by the relay will also be different.

[0085] In order to solve the above problems, those skilled in the art have designed multiple relays with different gain values ​​to adapt to cables of different lengths, and fixed the gain of the relay without recharging to adapt to different cable attenuations.

[0086] The gain value of the relay is fixed, and different models use relays with different configurations. Although this can meet the needs, the adaptation solution is complicated, and each model needs to develop adaptive software separately, which will increase costs.

[0087] Based on this, an embodiment of the present application provides a signal transmission system, which includes a T-Box, a cable, and a relay. One end of the cable is coupled to the T-Box, and the other end of the cable is coupled to the relay. By changing the structure of the T-Box and the relay, the signal transmitted in the cable includes a gain control signal. At this time, the relay is a gain adjustable relay, so that the same signal transmission system can be adapted to different vehicles 100.

[0088] Below, the T-Box and the relay in the signal transmission system are schematically described respectively, and then the signal transmission system is schematically described.

[0089] Example 1

[0090] Figure 3 A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0091] The present application embodiment provides a T-Box, such as Figure 3 As shown, the T-Box includes a first branch 1 and a second branch 2 .

[0092] The first branch 1 includes a V2X circuit 61 and a first RF conduction circuit 11 . The first RF conduction circuit 11 is coupled between the V2X circuit 61 and a first junction point Q1 .

[0093] The V2X circuit 61 is used to send and receive radio frequency signals. The V2X circuit 61 can be used to receive radio frequency signals, and the V2X circuit 61 can also be used to send radio frequency signals. The radio frequency signal is, for example, a 5.9 GHz signal. Of course, the radio frequency signal can be a signal of any frequency band transmitted by the V2X circuit 61, and 5.9 GHz is only an example.

[0094] When the T-Box sends a signal, the V2X circuit 61 is used to output a radio frequency signal, and the radio frequency signal output by the V2X circuit 61 is transmitted to the first junction point Q1 through the first radio frequency conduction circuit 11. When the T-Box receives a signal, the V2X circuit 61 is used to receive a radio frequency signal, and the first junction point Q1 transmits the radio frequency signal to the V2X circuit 61 through the first radio frequency conduction circuit 11.

[0095] It can also be understood that the signal transmitted in the first branch 1 is a radio frequency signal, and the radio frequency signal can be transmitted from the V2X circuit 61 to the first combining point Q1, and the radio frequency signal can also be transmitted from the first combining point Q1 to the V2X circuit 61.

[0096] The embodiment of the present application does not limit the structure of the V2X circuit 61, and the V2X circuits (also called V2X modules) in the related art are applicable to the embodiment of the present application.

[0097] The second branch 2 includes a first control signal terminal M1 and a first RF isolation circuit 21 . The first RF isolation circuit 21 is coupled between the first control signal terminal M1 and the first junction point Q1 .

[0098] The first control signal terminal M1 is used to output a control signal, and the control signal includes, for example, a first gain control signal, a transceiver control signal, etc. When the distance between the T-Box and the antenna is different, the control signal can control the gain of the relay to adjust the gain of the relay in combination with a specific scenario.

[0099] It can also be understood that what is transmitted in the second branch 2 is a control signal, and the control signal can be transmitted from the first control signal terminal M1 to the first combining point Q1.

[0100] The radio frequency signal and the control signal are combined at the first combining point Q1 and then output to the cable. Therefore, the signal transmitted in the cable at least includes the radio frequency signal and the control signal.

[0101] Then, when the T-Box is used to send a signal, the RF signal transmitted by the first branch 1 and the control signal transmitted by the second branch 2 are combined at the first combining point Q1 and then output. When the T-Box is used to receive a signal, the first combining point Q1 receives the RF signal and then branches the RF signal to the first branch 1.

[0102] In some embodiments, the RF signal and the control signal have different frequencies.

[0103] For example, the radio frequency signal is a high frequency signal, and the control signal is a low frequency signal.

[0104] In some embodiments, in order to prevent the signals on the first branch 1 and the second branch 2 from interfering with each other, the first RF conduction circuit 11 in the first branch 1 is used to pass the RF signal and isolate the control signal. The first RF isolation circuit 21 in the second branch 2 is used to pass the control signal and isolate the RF signal.

[0105] That is to say, based on Figure 3 The T-Box shown, when the T-Box is used to send signals:

[0106] The RF signal output by the V2X circuit 61 in the first branch 1 is transmitted to the first combining point Q1 via the first RF conduction circuit 11, but the RF signal is isolated by the first RF isolation circuit 21 and is hardly transmitted to the first control signal terminal M1, resulting in almost no RF signal loss.

[0107] In the second branch 2, the control signal output by the first control signal terminal M1 is transmitted to the first combining point Q1 via the first RF isolation circuit 21, but the control signal is isolated by the first RF conduction circuit 11 and is hardly transmitted to the V2X circuit 61, resulting in almost no loss of the control signal.

[0108] When the T-Box is used to receive signals:

[0109] The signal received by the first combining point Q1 includes a radio frequency signal.

[0110] The RF signal in the first combining point Q1 is isolated by the first RF isolation circuit 21 and is hardly transmitted to the first control signal terminal M1, but the RF signal can be transmitted to the V2X circuit 61 through the first RF conduction circuit 11 to separate the RF signal to the first branch 1.

[0111] The control signal in the first combining point Q1 is isolated by the first RF conduction circuit 11 and will not be transmitted to the V2X signal end, but the control signal can be transmitted to the first control signal end M1 through the first RF isolation circuit 21 to separate the control signal in the aggregated signal to the second branch 2.

[0112] In the embodiment of the present application, the first combining point Q1 can be coupled to the signal output end of the T-Box, or the first combining point Q1 serves as the signal output end of the T-Box.

[0113] In some embodiments, Figure 3 As shown, the T-Box further includes a connector 80 , through which the T-Box is coupled to the cable, and the first junction point Q1 is coupled to the connector 80 .

[0114] In the T-Box provided in the embodiment of the present application, the radio frequency signal transmitted by the first branch 1 is used for V2X communication, and the control signal transmitted by the second branch 2 is used to control the relay, and the control signal can carry any information related to the control relay. The embodiment of the present application aggregates the control signal with the radio frequency signal so that the T-Box can synchronously output the control signal when outputting the radio frequency signal, and the control signal can be used to control the relay to adjust the gain and other parameters. When the T-Box is applied to the signal transmission system, the T-Box can synchronously transmit the radio frequency signal and the control signal to the relay through the cable, without excessively increasing the complexity of the signal transmission system, but can enable the relay to dynamically adjust its own parameters according to the control signal to match different vehicle models. Moreover, it is found through simulation that while synchronously transmitting the control signal, the loss of the radio frequency signal transmitted by the V2X circuit 61 is low, and the radio frequency performance is hardly affected. In addition, the embodiment of the present application realizes the aggregation of the control signal and the radio frequency signal through the T-Box itself, and realizes the synchronous transmission of the control signal and the radio frequency signal through a hardware circuit solution, without the need to add additional large-size devices, reducing costs, meeting the needs of miniaturization, and can be applied to vehicles. For example, the control signal may carry information related to adjusting the relay gain, so as to adjust the relay gain according to different application scenarios to adapt to different cable attenuations, so that a set of signal transmission systems can be adapted to multiple vehicle models. And / or, the control signal may carry information related to informing the relay to send and receive signals, so as to adjust the relay's sending and receiving according to different application states.

[0115] Figure 4 A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0116] In some embodiments, Figure 4 As shown, the T-Box further includes a third branch 3 .

[0117] The third branch 3 includes a first power circuit 63 . The first power circuit 63 is coupled to a second junction point Q2 . The second junction point Q2 is located between the first RF isolation circuit 21 and the first control signal terminal M1 .

[0118] The first power supply circuit 63 is used to transmit DC power. The first power supply circuit 63 can supply power to the T-Box. The first power supply circuit 63 can also transmit the DC power to the relay through a cable to supply power to the relay.

[0119] It can also be understood that the third branch 3 transmits power current, which is transmitted from the first power circuit 63 to the second combining point Q2 and then to the first combining point Q1.

[0120] Then, the signals aggregated in the first combining point Q1 include RF signals, control signals and power supply current. Through the hardware circuit solution, one cable can synchronously transmit RF signals, control signals and power supply current without the need to introduce additional large-size devices, which has great market prospects.

[0121] The first power supply circuit 63 is used to provide a direct current of 1A, for example. The embodiment of the present application does not limit the structure of the first power supply circuit 63, and the circuits used to provide direct current in the related art are applicable to the embodiment of the present application.

[0122] In some embodiments, please refer to Figure 4 The third branch 3 further includes a first DC-passing and AC-isolating circuit 31, and the first DC-passing and AC-isolating circuit 31 is coupled between the first power supply circuit 63 and the second junction point Q2.

[0123] Since both the RF signal and the control signal are AC signals, by setting the first DC-isolating AC-isolating circuit 31 on the third branch 3, the DC power output by the first power supply circuit 63 can be transmitted to the second junction point Q2 through the first DC-isolating AC-isolating circuit 31, and then transmitted to the first junction point Q1. However, the RF signal transmitted by the first branch 1 and the control signal transmitted by the second branch 2 cannot be transmitted to the first power supply circuit 63 through the first DC-isolating AC-isolating circuit 31.

[0124] In this way, the loss of RF signals and control signals can be reduced.

[0125] In some embodiments, please refer to Figure 4 The first branch 1 also includes a first AC-DC blocking circuit 41, and the first AC-DC blocking circuit 41 and the first RF conduction circuit 11 are coupled in series between the V2X circuit 61 and the first junction point Q1.

[0126] Figure 4 In the figure, the first RF conduction circuit 11 is coupled close to the V2X circuit 61, and the first AC-DC blocking circuit 41 is coupled close to the first combining point Q1. Alternatively, the first RF conduction circuit 11 may be coupled close to the first combining point Q1, and the first AC-DC blocking circuit 41 may be coupled close to the V2X circuit 61.

[0127] By setting the first AC-DC blocking circuit 41 in the first branch 1, the RF signal can pass through the first AC-DC blocking circuit 41, but the power current at the first junction Q1 (for example, the power current transmitted from the first power circuit 63 to the first junction Q1) cannot be transmitted to the V2X circuit 61 through the first AC-DC blocking circuit 41. On the one hand, the loss of the power current can be reduced, and on the other hand, the interference to the RF signal transmitted by the first branch 1 can be reduced.

[0128] In some embodiments, please refer to Figure 4 The second branch 2 further includes a second AC-passing and DC-isolating circuit 51 , and the second AC-passing and DC-isolating circuit 51 is coupled between the first control signal terminal M1 and the second combining point Q2 .

[0129] That is to say, the second AC-passing and DC-isolating circuit 51 is coupled to the end of the first RF isolation circuit 21 away from the first junction Q1 .

[0130] Three signals, namely, radio frequency signal, control signal and power supply current, are aggregated at the first combining point Q1, and the radio frequency signal can be transmitted in the first branch 1. However, in order to reduce the loss of the radio frequency signal, it is not desired that the radio frequency signal be transmitted in the second branch 2 and the third branch 3. The first radio frequency isolation circuit 21 is coupled between the first combining point Q1 and the second combining point Q2. The radio frequency signal at the first combining point Q1 cannot be transmitted to the second combining point Q2, but the power supply current will be transmitted to the second combining point Q2. Therefore, by setting a second AC-DC isolation circuit 51 in the second branch 2, the power supply current can be prevented from being transmitted in the second branch 2. In other words, the power supply current will not be transmitted to the first control signal terminal M1. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference to the control signal transmitted by the second branch 2 can be weakened.

[0131] based on Figure 4 The circuit structure shown, when T-Box is used to send signals:

[0132] In the first branch 1, the RF signal output by the V2X circuit 61 is transmitted to the first combining point Q1, but the RF signal is isolated by the first RF isolation circuit 21 and will not be transmitted to the second branch 2 and the third branch 3, and there will be almost no loss of RF signal.

[0133] In the second branch 2, the control signal output by the first control signal terminal M1 is transmitted to the first junction Q1, but the control signal is isolated by the first RF conduction circuit 11 and will not be transmitted to the first branch 1. At the same time, the control signal is isolated by the first DC-isolating AC-isolating circuit 31 and will not be transmitted to the third branch 3, and there will be almost no loss of the control signal.

[0134] In the third branch 3, the power current output by the first power circuit 63 is transmitted to the first junction Q1, but the power current is isolated by the first AC-DC isolation circuit 41 and will not be transmitted to the first branch 1. At the same time, the power current is isolated by the second AC-DC isolation circuit 51 and will not be transmitted to the second branch 2, and there will be almost no loss of power current.

[0135] When the T-Box is used to receive signals:

[0136] The aggregate signal received by the first combining point Q1 includes a radio frequency signal.

[0137] The RF signal in the first combining point Q1 is isolated by the first RF isolation circuit 21 and will not be transmitted to the second branch 2 and the third branch 3, but the RF signal can be transmitted to the V2X circuit 61 through the first RF conduction circuit 11 to realize the transmission of the RF signal in the first branch 1.

[0138] What needs to be explained here is that Figure 4 In the T-Box shown, the first DC-isolating circuit 31, the first AC-isolating circuit 41 and the second AC-isolating circuit 51 are presented with dotted lines, indicating that the T-Box provided in the embodiment of the present application may not include the above three circuit modules, or may only include one or two of the above three circuit modules, and is not limited to that the T-Box must include all of the above three circuit modules.

[0139] Figure 5 and Figure 6 A schematic diagram of the topological structure of a T-Box provided in an embodiment of the present application.

[0140] Based on the above T-Box architecture, Figure 5 As shown, in some embodiments, the first RF conductive circuit 11 includes a bandpass filter.

[0141] The bandpass filter can pass high-frequency RF signals of 5.9 GHz but cannot pass low-frequency signals (control signals), and has a simple structure.

[0142] In some embodiments, the first DC-passing and AC-isolating circuit 31 includes an equivalent inductor L.

[0143] In some embodiments, the first AC-passing and DC-blocking circuit 41 includes a first DC-blocking capacitor C1 .

[0144] For example, the capacitance of the first DC blocking capacitor C1 is nfa level.

[0145] In some embodiments, the second AC-passing and DC-blocking circuit 51 includes a second DC-blocking capacitor C2.

[0146] For example, the capacitance of the second DC blocking capacitor C2 is nfa level.

[0147] In this way, the structure of T-Box is simple and the cost is low.

[0148] In some embodiments, Figure 5 As shown, the first radio frequency isolation circuit 21 is an isolator.

[0149] For example, the frequency of the radio frequency signal is 5.9 GHz, and the first radio frequency isolation circuit 21 is a 5.9 GHz isolator.

[0150] In this way, the first radio frequency isolation circuit 21 is a finished device and can be directly coupled to the T-Box, which is simple in design.

[0151] In other embodiments, Figure 6 As shown, the first RF isolation circuit 21 includes a (1 / 4+N / 2)λ transmission line X, a first end of the (1 / 4+N / 2)λ transmission line X is coupled to a first junction point Q1, a second end of the (1 / 4+N / 2)λ transmission line X is coupled to a first node P1, and the first node P1 is coupled to a second junction point Q2.

[0152] Wherein, λ is the wavelength of the radio frequency signal, and N is an integer greater than or equal to 0.

[0153] For example, N=0, the transmission line included in the first RF isolation circuit 21 is a 1 / 4λ transmission line. Alternatively, for example, N=1, the transmission line included in the first RF isolation circuit 21 is a 3 / 4λ transmission line. Alternatively, for example, N=2, the transmission line included in the first RF isolation circuit 21 is a (1 / 4+1)λ transmission line. Alternatively, for example, N=3, the transmission line included in the first RF isolation circuit 21 is a (3 / 4+1)λ transmission line, etc.

[0154] The isolation of multiple radio frequency signals is achieved through transmission lines, with a simple structure and a small occupied area.

[0155] In some embodiments, the T-Box further includes a circuit board, which may be, for example, a printed circuit board (PCB).

[0156] In some embodiments, the first branch 1, the second branch 2, and the third branch 3 are arranged on a circuit board.

[0157] In other embodiments, in the above-mentioned first branch 1, second branch 2, and third branch 3, except for the (1 / 4+N / 2)λ transmission line X, other devices are arranged on the circuit board, and the (1 / 4+N / 2)λ transmission line X is integrated inside the circuit board.

[0158] In this way, the T-Box occupies a small area and has a low cost.

[0159] Please continue to refer to Figure 6In some embodiments, the first RF isolation circuit 21 further includes a first capacitor C3 and a second capacitor C4.

[0160] The first end of the first capacitor C3 and the first end of the second capacitor C4 are coupled to the reference ground voltage terminal GND, and the second end of the first capacitor C3 and the second end of the second capacitor C4 are coupled to the second end of the (1 / 4+N / 2)λ transmission line X.

[0161] For example, the second end of the first capacitor C3 is coupled to the first node P1 , and the second end of the second capacitor C4 is coupled to the first node P1 .

[0162] By providing the first capacitor C3 and the second capacitor C4, the frequency band deviation caused by the processing error of the (1 / 4+N / 2)λ transmission line X can be compensated, thereby optimizing the isolation effect of the radio frequency signal.

[0163] In some embodiments, the capacitance of the first capacitor C3 and the second capacitor C4 is in the pF level.

[0164] Setting the capacitance of the first capacitor C3 and the second capacitor C4 to pF level can achieve a better isolation effect on the radio frequency signal.

[0165] In some embodiments, the capacitances of the first capacitor C3 and the second capacitor C4 are equal.

[0166] The capacitances of the first capacitor C3 and the second capacitor C4 are equal, so that the first node P1 can be used as an endpoint of the first RF isolation circuit 21, thereby improving the compensation accuracy of the (1 / 4+N / 2)λ transmission line X processing error.

[0167] Fig. 7A An architecture diagram of a transmission line network provided in an embodiment of the present application; Figure 7B A method provided in the embodiment of the present application Figure 6 A simulation diagram of the isolation effect of the first radio frequency isolation circuit 21 on radio frequency signals; Figure 7C A method provided in the embodiment of the present application Figure 6 The simulation diagram of the isolation effect of the first RF isolation circuit 21 on the RF signal is shown.

[0168] like Fig. 7A As shown in the transmission line theory, a transmission line with a characteristic impedance of Z0 is connected to a terminal with an impedance of Z L The two form a network.

[0169] For example, the characteristic impedance of the (1 / 4+N / 2)λ transmission line X is Z0, and the impedance of the first capacitor C3 and the second capacitor C4 is Z L , the first radio frequency isolation circuit 21 is regarded as a network.

[0170] Looking at the input impedance Z of this network I Will no longer be Z0. Input impedance Z I becomes:

[0171]

[0172] Among them, β = 2π / λ, λ is the wavelength of the signal propagating in the network, and J is the imaginary unit. When l = λ / 4, the formula is derived as follows:

[0173]

[0174] If the T-Box is open, then Z I = 0. If the T-Box is short-circuited, Z I =∞. Therefore, when the (1 / 4+N / 2)λ transmission line X is used to connect the main channel (first branch 1) and the branches (second branch 2 and third branch 3), there is almost no attenuation of the RF signal on the main channel.

[0175] like Figure 7B As shown, it is found through simulation that, taking the signal sent by T-Box as an example, the RF signal is detected between the first junction Q1 and the connector 80, and the attenuation of the RF signal is about -0.025. These attenuations include the attenuation of the RF signal caused by the devices and signal lines between the V2X circuit and the sampling point, as well as the attenuation of the RF signal by the first RF isolation circuit 21. Therefore, the attenuation of the 5.9GHz RF signal by the first RF isolation circuit 21 is very small. Figure 7C As shown, the RF signal is detected between the first node P1 and the second junction point Q2, and the attenuation of the RF signal is about -24. Therefore, the RF signal is hardly transmitted to the second junction point Q2 through the first RF isolation circuit 21.

[0176] Therefore, the first RF isolation circuit 21 based on the (1 / 4+N / 2)λ transmission line X isolates the RF signal while conducting the control signal, does not affect the normal transmission of the RF signal, and the attenuation of the RF signal is relatively small and can be almost ignored.

[0177] Next, the control signal transmitted in the second branch 2 is described.

[0178] Figure 8 A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0179] like Figure 8As shown, in some embodiments, the first control signal terminal M1 includes a first gain control signal terminal UART1. The second branch 2 also includes a first controller 62, which is coupled to the first gain control signal terminal UART1 and is used to send a first gain control signal uart1 to the first gain control signal terminal UART1.

[0180] For example, the first controller 62 is also coupled to the V2X circuit 61, and the V2X circuit 61 is used to send a transceiver control signal tx-en, and the transceiver control signal tx-en is used to indicate whether the T-Box transmits a radio frequency signal or receives a radio frequency signal. For example, when the transceiver control signal tx-en is 1, it is used to indicate that the T-Box is transmitting a radio frequency signal, and when the transceiver control signal tx-en is 0, it is used to indicate that the T-Box is receiving a radio frequency signal.

[0181] For example, the V2X circuit 61 includes a modem, and the modem is used to output a transceiver control signal tx-en.

[0182] The first controller 62 receives the transceiver control signal tx-en, and after receiving the transceiver control signal tx-en, sends the first gain control signal uart1 to the first gain control signal terminal UART1 in combination with the transceiver control signal tx-en.

[0183] For example, the transceiver control signal tx-en received by the first controller 62 is used to indicate that the T-Box is transmitting a radio frequency signal. The first controller 62 sends a first gain control signal uart1 to the first gain control signal terminal UART1. The first gain control signal uart1 is used to represent the gain adjustment value of the relay for the radio frequency signal.

[0184] The transceiver control signal tx-en received by the first controller 62 is used to indicate that the T-Box is receiving a radio frequency signal, and the first controller 62 does not send the first gain control signal uart1.

[0185] In some embodiments, the first controller 62 may be, for example, a microcontroller unit (MCU) of the T-Box, or may be a device disposed on a circuit board of the T-Box.

[0186] In addition, in some embodiments, the first gain control signal uart1 may be a signal that directly represents the relay gain value. After the relay receives the first gain control signal uart1, the gain value may be directly obtained.

[0187] Then, for different vehicles 100 , simulation tests can be performed before delivery, and the gain values ​​represented by the first gain control signal can be set in advance for different cable lengths.

[0188] For example, for the first type of vehicle, the first gain control signal uart1 issued by the first controller 62 directly represents a gain value of 2. For the second type of vehicle, the first gain control signal uart1 issued by the first controller 62 directly represents a gain value of 3.

[0189] In other embodiments, the first gain control signal uart1 may also be a signal carrying a gain value. After the relay receives the first gain control signal uart1, the first gain control signal uart1 still needs to be further processed to obtain the gain value.

[0190] Then, for different vehicles 100, the first gain control signal uart1 sent by the first controller 62 can be the same, and the relay itself further generates a gain control signal representing the gain value in combination with the first gain control signal uart1 according to different cable lengths. In this way, the signal transmission system can be adaptive to different vehicles 100.

[0191] Fig. 9 A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0192] like Fig. 9 As shown, in some embodiments, the first control signal terminal M1 also includes a first transceiver control signal terminal TX-EN1, and the first transceiver control signal terminal TX-EN1 is coupled to the V2X circuit 61 for receiving the transceiver control signal tx-en output by the V2X circuit 61.

[0193] The first controller 62 is configured to receive the transceiver control signal tx-en of the first transceiver control signal terminal TX-EN1 and output a first gain control signal uart1 to the first gain control signal terminal UART1 .

[0194] For example, the first controller 62 is coupled to the first gain control signal terminal UART1 and the first transceiver control signal terminal TX-EN1.

[0195] In some embodiments, the second branch 2 further includes a modulation circuit 70 , an input end of the modulation circuit 70 is coupled to the first gain control signal end UART1 and the first transceiver control signal end TX-EN1 , and an output end of the modulation circuit 70 is coupled to the first RF isolation circuit 21 .

[0196] In the case that the second branch 2 further includes a second AC-passing and DC-isolating circuit 51 , the second end of the modulation circuit 70 is coupled to the second AC-passing and DC-isolating circuit 51 .

[0197] That is, the modulation circuit 70 modulates the first gain control signal uart1 and the first transceiver control signal tx-en and transmits them in the second branch 2. Then, in the second branch 2, in addition to the first gain control signal uart1, the first transceiver control signal tx-en can also be transmitted.

[0198] In some embodiments, the modulation circuit 70 includes a first AND gate AND1 .

[0199] An input terminal of the first AND gate AND1 is coupled to both the first gain control signal terminal UART1 and the first transceiver control signal terminal TX-EN1 , and an output terminal of the first AND gate AND1 is coupled to the first RF isolation circuit 21 .

[0200] In this case, the first AND gate AND1 can be understood as a double AND gate. The first AND gate AND1 performs AND modulation on the first gain control signal and the first transceiver control signal, so that the modulated signal output by the first AND gate AND1 contains information of the first gain control signal and the first transceiver control signal.

[0201] After the transceiver control signal tx-en transmitted by the first transceiver control signal terminal TX-EN1 and the first gain control signal uart1 transmitted by the first gain control signal terminal UART1 are modulated by the modulation circuit 70, the second branch 2 can synchronously transmit the first transceiver control signal tx-en and the first gain control signal uart1 to the first combining point Q1 and transmit through the cable. The amount of information of the aggregated signal transmitted in the cable is increased, and there is no need to set a separate first transceiver control signal tx-en branch.

[0202] In some embodiments, the second branch 2 further includes an operational amplifier (OP), and the operational amplifier OP is coupled between the modulation circuit 70 and the first RF isolation circuit 21 (the second AC-passing and DC-isolating circuit 51 ).

[0203] By providing an operational amplifier OP at the output end of the modulation circuit 70, the signal modulated by the modulation circuit 70 can be amplified / attenuated and then transmitted to the first summing point Q1 to meet the requirements of different application scenarios.

[0204] Fig.10 A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0205] like Fig.10 As shown, in some embodiments, the second branch 2 further includes a carrier circuit 64 , and the carrier circuit 64 is used to output a carrier signal; the carrier circuit 64 is coupled to the input end of the modulation circuit 70 .

[0206] For example, the carrier signal output by the carrier circuit 64 is a clock signal clk. For example, the clock signal clk is a signal with a frequency of 100 MHz. For example, the clock signal clk is a 125 MHz signal. Of course, the clock signal clk can also be a signal of other frequencies.

[0207] For example, the carrier circuit 64 is a clock oscillator, which is used to generate a clock signal with a frequency of 125 MHz. Of course, the clock signal generated by the clock oscillator can also be of other frequencies, as long as the frequency of the clock signal is different from the frequency of the radio frequency signal.

[0208] So, if Fig.10 As shown, the input end of the first AND gate AND1 is coupled to both the first gain control signal end UART1 and the carrier circuit 64, and the output end of the first AND gate AND1 is coupled to the first RF isolation circuit 21. The first AND gate AND1 modulates the first gain control signal uart1 and the carrier signal. In this case, the first AND gate AND1 can be understood as a double AND gate.

[0209] By setting a carrier signal to carry the control signal for transmission, the control signal can be assisted in transmission, thereby improving the transmission effect of the control signal. By using a clock signal as a carrier signal, it is easy to separate the clock signal from the first gain control signal after the modulated signal is received, and data is not easily lost during separation.

[0210] Fig.11 A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0211] like Fig.11 As shown, in some embodiments, the second branch 2 includes a carrier circuit 64, and the first control signal terminal M1 also includes a first gain control signal terminal UART1 and a first transceiver control signal terminal TX-EN1.

[0212] In this case, illustratively, the modulation circuit 70 includes a first AND gate AND1 , and the first AND gate AND1 can be understood as a triple AND gate.

[0213] The input end of the first AND gate AND1 is coupled to the carrier circuit 64, the first transceiver control signal end TX-EN1 and the first gain control signal end UART1, and the output end of the first AND gate AND1 is coupled to the second AC-isolating circuit 51 or the operational amplifier OP.

[0214] Then, the first AND gate AND1 can modulate the first gain control signal uart1, the first transceiver control signal tx-en, and the carrier signal, and transmit them to the relay through the cable.

[0215] Fig.12A schematic diagram of a T-Box framework provided in an embodiment of the present application.

[0216] Alternatively, for example, the modulation circuit 70 includes a second AND gate AND2 and a third AND gate AND3 , and both the second AND gate AND2 and the third AND gate AND3 are double AND gates.

[0217] An input terminal of the second AND gate AND2 is coupled to two of the carrier circuit 64, the first transceiver control signal terminal TX-EN1 and the first gain control signal terminal UART1, and an output terminal of the second AND gate AND2 is coupled to an input terminal of the third AND gate AND3.

[0218] The input end of the third AND gate AND3 is also coupled to the carrier circuit 64, the first transceiver control signal end TX-EN1 and the remaining one of the first gain control signal end UART1, and the output end of the third AND gate AND3 is coupled to the first RF isolation circuit 21 (the second AC-passing and DC-isolating circuit 51).

[0219] It can also be understood that after two of the carrier circuit 64, the first transceiver control signal terminal TX-EN1, and the first gain control signal terminal UART1 are coupled to the second AND gate AND2, the other is coupled to the third AND gate AND3 at the output end of the second AND gate AND2. The embodiment of the present application does not limit which two of the carrier circuit 64, the first transceiver control signal terminal TX-EN1, and the first gain control signal terminal UART1 are coupled to the second AND gate AND902 first. Fig.12 The figure is for illustration only.

[0220] For example, Fig.12 As shown, the carrier circuit 64 and the first transceiver control signal terminal TX-EN1 are coupled to the input terminal of the second AND gate AND2, the output terminal of the second AND gate AND2 and the first gain control signal terminal UART1 are coupled to the input terminal of the third AND gate AND3, and the output terminal of the third AND gate AND3 is coupled to the second AC-DC blocking circuit 51 or the operational amplifier OP.

[0221] Alternatively, for example, the carrier circuit 64 and the first gain control signal terminal UART1 are coupled to the input terminal of the second AND gate AND2, and the output terminal of the second AND gate AND2 and the first transceiver control signal terminal TX-EN1 are coupled to the input terminal of the third AND gate AND3.

[0222] Or, illustratively, the first gain control signal terminal UART1 and the first transceiver control signal terminal TX-EN1 are coupled to the input terminal of the second AND gate AND2, and the output terminal of the second AND gate AND2 and the carrier circuit 64 are coupled to the input terminal of the third AND gate AND3.

[0223] Fig.13A modulation result diagram of a modulation circuit 70 provided in an embodiment of the present application.

[0224] Fig.13 The horizontal axis is time, and the vertical axis is voltage. From top to bottom, the waveforms of the signal of the carrier circuit 64, the signal of the first transceiver control signal terminal TX-EN1, the signal of the first gain control signal terminal UART1, and the modulated signal are shown in sequence. After being modulated by the modulation circuit 70, the modulated signal includes the signal of the carrier circuit 64, the signal of the first transceiver control signal terminal TX-EN1, and the signal of the first gain control signal terminal UART1. One signal carries three kinds of information.

[0225] Example 2

[0226] Fig.14 A schematic diagram of a relay framework provided in an embodiment of the present application.

[0227] The present application embodiment provides a relay, such as Fig.14 As shown, the relay includes a fourth branch 4 and a fifth branch 5 .

[0228] The fourth branch 4 includes a vehicle-to-anything V2X signal terminal and a bidirectional switch circuit 13. The bidirectional switch circuit 13 includes a first path L1 and a second path L2 coupled in parallel between the V2X signal terminal and the third junction point Q3. The first path L1 includes a first power amplifier PA1. The output terminal of the first power amplifier PA1 is coupled to the V2X signal terminal.

[0229] The V2X signal terminal is coupled to the antenna for sending and receiving radio frequency signals. The V2X signal terminal can be used to receive radio frequency signals, and the V2X signal terminal can also be used to send radio frequency signals. The radio frequency signal can be the same as the radio frequency signal in Example 1, and will not be repeated here.

[0230] When the relay is used to receive the RF signal sent by the T-Box, the third combining point Q3 receives the RF signal and transmits it to the V2X signal end via the first path L1 (first power amplifier PA1). When the relay is used to send a signal to the T-Box, the RF signal sent by the V2X signal end is transmitted to the third combining point Q3 via the second path S2.

[0231] It can also be understood that the fourth branch 4 transmits a radio frequency signal, and the radio frequency signal can be transmitted from the V2X signal end to the third combining point Q3, and the radio frequency signal can also be transmitted from the third combining point Q3 to the V2X signal end.

[0232] A bidirectional switching circuit refers to a circuit that contains a bidirectional line. Signals can be transmitted in both directions, but the signal can only be transmitted in one direction at the same time, and the two directions cannot be transmitted at the same time.

[0233] In some embodiments, the bidirectional switch circuit is, for example, a half duplex circuit.

[0234] Then, when the relay is used to receive signals, the first path L1 is conductive, and when the relay is used to send signals, the second path S2 is conductive.

[0235] The fifth branch 5 includes a second control signal terminal M2 and a second RF isolation circuit 22. The second control signal terminal M2 is coupled to the bidirectional switch circuit 13. The second RF isolation circuit 22 is coupled between the second control signal terminal M2 and the third junction point Q3.

[0236] The second control signal terminal M2 is used to receive a control signal, and the control signal received by the second control signal terminal M2 matches the control signal sent by the first control signal terminal M1 in the T-Box.

[0237] It can also be understood that what is transmitted in the fifth branch 5 is a control signal, and the control signal can be transmitted from the third combining point Q3 to the second control signal terminal M2.

[0238] The control signal is, for example, a control signal transmitted by the T-Box. For example, reference may be made to the related description of the control signal in Example 1, which will not be repeated here.

[0239] Then, when the relay is used to send a signal, the RF signal transmitted by the fourth branch 4 is output via the third combining point Q3. When the relay is used to receive a signal, the RF signal in the aggregated signal (including the RF signal and the control signal) transmitted by the third combining point Q3 is transmitted to the V2X signal terminal via the fourth branch 4, and the control signal in the aggregated signal (that is, the modulated signal mentioned above) is transmitted to the second control signal terminal M2 via the fifth branch 5.

[0240] In some embodiments, in order to prevent the signals on the fourth branch 4 and the fifth branch 5 from interfering with each other, the second RF isolation circuit 22 in the fifth branch 5 is used to pass the control signal and isolate the RF signal.

[0241] In some embodiments, the fourth branch 4 further includes a second RF conduction circuit 12, which is coupled between the bidirectional switch circuit 13 and the third junction point Q3, and is used to pass the RF signal and isolate the control signal.

[0242] For example, the second RF conduction circuit 12 includes a bandpass filter. The second RF conduction circuit 12 may be the same as the first RF conduction circuit 11, or they may be different.

[0243] In some embodiments, Fig.14 As shown, the second path S2 in the bidirectional switch circuit 13 includes a second power amplifier PA2.

[0244] Illustratively, the second power amplifier PA2 includes a low noise amplifier (LNA), and an output terminal of the LNA is coupled to the third combining point Q3.

[0245] Based on this, optionally, the second control signal terminal M2 is coupled to the bidirectional switch circuit 13 , and the second control signal terminal M2 may be coupled to the first power amplifier OP1 and the second power amplifier OP2 , respectively.

[0246] For example, the control signal includes a first gain control signal, and the first gain control signal is used to control the gain factors of the first power amplifier OP1 and the second power amplifier OP2.

[0247] Then, the second control signal terminal M2 includes a second gain control signal terminal, and the second gain control signal terminal is coupled to the first power amplifier OP1 and the second power amplifier OP2 respectively.

[0248] Or, as an example, the control signal further includes a transceiver control signal, and the transceiver control signal is further used to control the first power amplifier OP1 or the second power amplifier OP2 to be turned on.

[0249] So, if Fig.15 As shown, the second control signal terminal M2 includes a second gain control signal terminal UART2 and a second transceiver control signal terminal TX-EN2, and the second transceiver control signal terminal TX-EN2 is coupled to the first power amplifier OP1 and the second power amplifier OP2 respectively.

[0250] In this way, when the radio frequency signal is transmitted on the second path S2, the low noise amplifier can amplify the radio frequency signal according to demand.

[0251] In some embodiments, the relay also includes a connector 80 .

[0252] One end of the connector 80 is coupled to the third junction point Q3, and the other end of the connector 80 is used to couple to a cable.

[0253] In some embodiments, Fig.15 As shown, the fifth branch 5 further includes a second controller 65 and a first frequency band blocking circuit 71 .

[0254] The first frequency band blocking circuit 71 is coupled between the second transceiver control signal terminal TX-EN2 and the second node P2 . The second node P2 is coupled to the second RF isolation circuit 22 .

[0255] The blocking frequency band of the first frequency band blocking circuit 71 matches the frequency band of the first gain control signal uart1 and is used to block the first gain control signal uart1 and pass the transceiver control signal tx-en.

[0256] Illustratively, the first frequency band blocking circuit 71 includes a low pass filter or a detector.

[0257] The control signal received by the third junction Q3 includes the first gain control signal uart1 and the transceiver control signal tx-en, and the control signal is transmitted to the second node P2. The first frequency band blocking circuit 71 blocks the first gain control signal uart1, and transmits the transceiver control signal tx-en to the second transceiver control signal terminal TX-EN2 through the transceiver control signal tx-en. The second transceiver control signal terminal TX-EN2 is coupled to the bidirectional switch circuit 13, and is used to control the first power amplifier PA1 or the second power amplifier PA2 to be turned on.

[0258] The second controller 65 is configured to output a second gain control signal uart2 to the second gain control signal terminal UART2 after receiving the transceiver control signal tx-en of the second transceiver control signal terminal TX-EN2 and the control signal of the second node P2.

[0259] For example, the output end of the second controller 65 is coupled to the second gain control signal end UART2, and the input end of the second controller 65 is coupled to the second transceiver control signal end TX-EN2 and the second node P2. The second controller 65 is configured to receive the transceiver control signal tx-en of the second transceiver control signal end TX-EN2 and the control signal of the second node P2, and output the second gain control signal uart2 to the second gain control signal end UART2 according to the transceiver control signal tx-en and the control signal of the second node P2.

[0260] The modulation signal (control signal) at the second node P2 and the transceiver control signal tx-en of the second transceiver control signal terminal TX-EN2 are both transmitted to the second controller 65, and the second controller 65 determines whether the relay is used to send signals or receive signals based on the transceiver control signal tx-en. When the relay is used to receive signals, the second controller 65 decodes the modulation signal to generate a second gain control signal uart2, and the second gain control signal uart2 is transmitted to the bidirectional switch circuit 13 for controlling the gain of the first power amplifier PA1. When the relay is used to send signals, the second controller 65 does not decode the modulation signal, and the gain of the second power amplifier PA2 is the set gain.

[0261] The second controller 65 may be, for example, an MCU of the relay, or a device disposed on a circuit board of the relay.

[0262] Fig.16 A schematic diagram of a relay framework provided in an embodiment of the present application.

[0263] like Fig.16As shown, in some embodiments, the fifth branch 5 further includes a second frequency band blocking circuit 72 , and the second frequency band blocking circuit 72 is coupled between the second node P2 and the second RF isolation circuit 22 .

[0264] The blocking frequency band of the second frequency band blocking circuit 72 matches the frequency band of the carrier signal (eg, the clock signal clk) and is used to block the carrier signal and pass the first gain control signal uart1 and the transceiver control signal tx-en.

[0265] Illustratively, the second frequency band blocking circuit 72 includes a low pass filter or a detector.

[0266] In some embodiments, the blocking frequency of the second frequency band blocking circuit 72 is higher than the blocking frequency band of the first frequency band blocking circuit 71 .

[0267] Then, the modulated signal transmitted by the second RF isolation circuit 22 is blocked for the first time by the second frequency band blocking circuit 72 to remove the clock signal clk, and the first gain control signal uart1 and the transceiver control signal tx-en are transmitted to the second node P2 to be transmitted to the second controller 65 and the first frequency band blocking circuit 71. Then the first frequency band blocking circuit 71 filters out the first gain control signal uart1 and transmits the transceiver control signal tx-en to the second transceiver control signal terminal TX-EN2. The second controller 65 identifies the first gain control signal uart1 and outputs the second gain control signal uart2.

[0268] Fig.17 A framework diagram of a relay provided in an embodiment of the present application.

[0269] In some embodiments, Fig.17 As shown, the fifth branch 5 further includes a first signal enhancement circuit 90 , and the first signal enhancement circuit 90 is coupled between the second controller 65 and the second node P2 .

[0270] The first signal enhancement circuit 90 is used to enhance the signal of the second node P2 and transmit it to the second controller 65. The enhancement method includes but is not limited to amplification. The present embodiment does not limit the structure of the first signal enhancement circuit 90. Any circuit that can enhance the signal strength is applicable to the present embodiment.

[0271] By providing the first signal enhancement circuit 90 between the second controller 65 and the second node P2, the signal of the second node P2 can be enhanced and then transmitted to the second controller 65, so as to improve the accuracy of signal processing.

[0272] In some embodiments, the fifth branch 5 further includes a second signal enhancement circuit, and the second signal enhancement circuit is coupled between the second controller 65 and the second transceiver control signal terminal TX-EN2.

[0273] The second signal enhancement circuit is used to enhance the signal of the second transceiver control signal terminal TX-EN2 and transmit it to the second controller 65. The enhancement method includes but is not limited to amplification. The embodiment of the present application does not limit the structure of the second signal enhancement circuit. Any circuit that can enhance the signal strength is applicable to the embodiment of the present application.

[0274] By providing a second signal enhancement circuit between the second controller 65 and the second transceiver control signal terminal TX-EN2, the signal of the second transceiver control signal terminal TX-EN2 can be enhanced before being transmitted to the second controller 65, so as to improve the accuracy of the signal.

[0275] In some other embodiments, the fifth branch 5 further includes a third signal enhancement circuit, and the third signal enhancement circuit is coupled between the second node P2 and the second RF isolation circuit 22 .

[0276] The third signal enhancement circuit is used to enhance the modulated signal output by the second RF isolation circuit 22 and then output it. The enhancement method includes but is not limited to amplification. The present embodiment does not limit the structure of the third signal enhancement circuit. Any circuit that can enhance the signal strength is applicable to the present embodiment.

[0277] By providing a second signal enhancement circuit between the second node P2 and the second RF isolation circuit 22 , the signal output by the second RF isolation circuit 22 can be enhanced before being transmitted to the second node P2 , so as to improve the accuracy of the signal.

[0278] Fig.18 A framework diagram of a relay provided in an embodiment of the present application.

[0279] In some embodiments, Fig.18 As shown, the relay also includes a power detector 99, which is coupled to the second controller 65 and the third junction Q3 respectively. The second controller 65 is also configured to receive a power signal sent by the power detector before outputting the second gain control signal uart2 to the second gain control signal terminal UART2.

[0280] Specifically, the second gain control signal uart2 is determined according to the first gain control signal uart1 and the power signal.

[0281] The power detector 99 can be, for example, a power voltage detector tube, which is used to convert the RF signal strength at the third junction Q3 into a voltage value, determine the power of the RF signal according to the voltage value, and inform the second controller 65 of the power signal. The second controller 65 outputs a second gain control signal uart2 based on the first gain control signal uart1 (characterizing the power strength of the RF signal output by the T-Box) and the power signal output by the power detector 99 (characterizing the power strength of the RF signal after the cable line loss) to perform corresponding gain control on the first power amplifier PA1. The gain value of the second gain control signal uart2 output by the second controller 65 is different for different cable lengths, so that the signal transmission system has the function of adaptively adapting to different cable lengths, so that the signal transmission system provided in the embodiment of the present application can be applicable to vehicles 100 with cables of various lengths.

[0282] For example, the line loss can be obtained by comparing the difference between the first gain control signal uart1 and the power signal output by the power detector 99. The gain of the first power amplifier PA1 is converted according to the line loss (for example, a comparison table of line loss and gain is stored in the second controller 65), and the second gain control signal uart2 is output to the first power amplifier PA1, so that the power of the signal output by the first power amplifier PA1 is the same as the first gain control signal uart1. Alternatively, the power of the signal output by the first power amplifier PA1 is different from the first gain control signal uart1, but the difference between the two is within the acceptable line loss range.

[0283] For example, the power detector 99 may be coupled to the third junction point Q3. Alternatively, for example, the power detector 99 may be coupled between the second RF conduction circuit 12 and the bidirectional switch circuit 13. The power detector 99 may receive the RF signal.

[0284] Of course, in some embodiments, the relay may not include the power detector 99. The T-Box knows the line loss in advance for different cable lengths, and outputs a first gain control signal uart1 that matches the line loss. The first gain control signal uart1 can control the gain of the first power amplifier PA1. In this way, when applied to different vehicles 100, the signal transmission system only needs to pre-set the first gain control signal uart1. The signal transmission system provided in the embodiment of the present application can still be applied to vehicles 100 with various cable lengths.

[0285] Fig.19 A topological diagram of a relay provided in an embodiment of the present application.

[0286] In some embodiments, Fig.19 As shown, the relay further includes a sixth branch 6 , and the sixth branch 6 includes a second power supply circuit 66 .

[0287] The second power circuit 66 is coupled to a fourth junction point Q4 , and the fourth junction point Q4 is located between the second RF isolation circuit 22 and the second control signal terminal M2 .

[0288] For example, the fourth combining point Q4 is located between the second RF isolation circuit 22 and the second frequency band blocking circuit 72 .

[0289] The second power supply circuit 66 is used to receive direct current. After receiving the direct current, the second power supply circuit 66 can convert the direct current and then supply it to the relay, or can directly supply it to the relay, which is not limited in the embodiment of the present application.

[0290] In some embodiments, Fig.19 As shown, the fourth branch 4 further includes a third AC-passing and DC-isolating circuit 42 , and the third AC-passing and DC-isolating circuit 42 is coupled between the bidirectional switch circuit 13 and the third junction point Q3 .

[0291] The embodiment of the present application does not limit the structure of the third AC-passing DC-blocking circuit 42. By way of example, the third AC-passing DC-blocking circuit 42 includes a third DC-blocking capacitor C5. The third DC-blocking capacitor C5 may have the same structure as the first DC-blocking capacitor C1.

[0292] In some embodiments, the fifth branch 5 further includes a fourth AC-passing and DC-isolating circuit 52 , and the fourth AC-passing and DC-isolating circuit 52 is coupled between the second control signal terminal M2 (the second frequency band blocking circuit 72 ) and the fourth junction point Q4 .

[0293] The embodiment of the present application does not limit the structure of the fourth AC-passing DC-blocking circuit 52. By way of example, the fourth AC-passing DC-blocking circuit 52 includes a fourth DC-blocking capacitor C6. The fourth DC-blocking capacitor C6 may have the same structure as the second DC-blocking capacitor C2.

[0294] In some embodiments, the sixth branch 6 further includes a second DC-passing and AC-isolating circuit 32 , and the second DC-passing and AC-isolating circuit 32 is coupled between the second power circuit 66 and the fourth junction point Q4 .

[0295] The embodiment of the present application does not limit the structure of the second direct-current-isolating alternating-current-isolating circuit 32 . By way of example, the second direct-current-isolating alternating-current-isolating circuit 32 includes an equivalent inductor L.

[0296] In some embodiments, the structure of the second RF isolation circuit 22 may be the same as that of the first RF isolation circuit 21 .

[0297] For example, Fig.19As shown, the second RF isolation circuit 22 includes a (1 / 4+N / 2)λ transmission line X, a first end of the (1 / 4+N / 2)λ transmission line X is coupled to the third junction point Q3, and a second end of the (1 / 4+N / 2)λ transmission line X is coupled to the third node P3. The third node P3 is coupled to the fourth node Q4, and the fourth node Q4 is coupled to the second control signal terminal M2 and the second power supply circuit 66, respectively.

[0298] In some embodiments, the second RF isolation circuit 22 further includes a third capacitor C7 and a fourth capacitor C8.

[0299] A first end of the third capacitor C7 and a first end of the fourth capacitor C8 are both coupled to the reference ground voltage terminal GND, and a second end of the third capacitor C7 and a second end of the fourth capacitor C8 are both coupled to the third node P3.

[0300] The relay provided in the embodiment of the present application controls and adjusts the relay itself in combination with the control signal after receiving the control signal sent by the T-Box, so that the relay has a dynamically adjustable function to meet the needs of different application scenarios. In the case where the control signal includes a first gain control signal, the relay can adjust its own gain value in combination with the first gain control signal to adapt to the line loss in different vehicles 100. In this way, a set of signal transmission circuits can be adapted to various vehicles 100, with high adaptability and low cost.

[0301] Example 3

[0302] Fig. 20 An architectural diagram of a signal transmission system provided in an embodiment of the present application.

[0303] The present application embodiment provides a signal transmission system, such as Fig. 20 As shown, the signal transmission system includes a T-Box, a cable and a relay, and two ends of the cable are respectively coupled to a connector 80 in the T-Box and a connector 80 in the relay.

[0304] It should be understood that the connector 80 in the T-Box and the connector 80 in the relay may be the same or different, and this embodiment of the present application does not limit this.

[0305] The V2X signal end of the relay in the signal transmission system is used to couple with the antenna. When the signal transmission system is applied to a vehicle, the antenna is the V2X antenna of the vehicle.

[0306] In some embodiments, the T-Box in the signal transmission system includes any one of the T-Boxes shown in Example 1, and the relay in the signal transmission system includes any one of the relays shown in Example 2. Fig. 20 This is only an illustration and is not intended to be limiting.

[0307] Below, Fig. 20 Taking as an example, the communication process of the signal transmission system is schematically illustrated.

[0308] The T-Box sends an aggregate signal to the relay, which includes the RF signal transmitted by the first branch 1, the modulated signal transmitted by the second branch 2 (including the signal of the carrier circuit 64, the signal of the first gain control signal terminal UART1 and the signal of the first transceiver control signal terminal TX-EN1), and the power supply current transmitted by the third branch 3. The aggregate signal is transmitted to the relay via the cable, and the signal received at the third combining point Q3 of the relay is the aggregate signal.

[0309] The RF signal in the aggregate signal is isolated by the second RF isolation circuit 22 and cannot reach the fifth branch 5 and the sixth branch 6 , but the RF signal can be transmitted in the fourth branch 4 to the bidirectional switch circuit 13 .

[0310] The power current in the aggregate signal is isolated by the third AC-DC isolation circuit 42 and the fourth AC-DC isolation circuit 52 and cannot reach the fourth branch 4 and the fifth branch 5 , but the power current can be transmitted to the second power circuit 66 in the sixth branch 6 .

[0311] The modulated signal in the aggregated signal is isolated by the second RF conduction circuit 12 and cannot reach the fourth branch 4. However, the modulated signal can reach the fourth node Q4 through the second RF isolation circuit 22. After reaching the fourth node Q4, the modulated signal is isolated by the second DC-isolation circuit 32 and cannot reach the sixth branch 6, but the modulated signal can reach the fifth branch 5.

[0312] The modulation signal includes a carrier signal (e.g., a clock signal clk) output by the carrier circuit 64, a first gain control signal uart1 output by the first gain control signal terminal UART1, and a transceiver control signal tx-en output by the first transceiver control signal terminal TX-EN1. The clock signal clk in the modulation signal is blocked by the second frequency band blocking circuit 72 and cannot reach the second node P2, but the first gain control signal uart1 and the transceiver control signal tx-en in the modulation signal can reach the second node P2. The first gain control signal uart1 in the second node P2 is blocked by the first frequency band blocking circuit 71 and cannot be transmitted to the second transceiver control signal terminal TX-EN2, but the transceiver control signal tx-en can be transmitted to the second transceiver control signal terminal TX-EN2. The transceiver control signal tx-en is transmitted to the bidirectional switch circuit 13 via the second transceiver control signal terminal TX-EN2 to control the first power amplifier PA1 in the bidirectional switch circuit 13 to turn on and the second control amplifier PA2 to turn off. Synchronously, the modulation signal composed of the first gain control signal uart1 and the transceiver control signal tx-en at the second node P2 is transmitted to the second controller 65, and the transceiver control signal tx-en of the second transceiver control signal terminal TX-EN2 is also transmitted to the second controller 65. The second controller 65 determines whether to decode the modulation signal based on the transceiver control signal tx-en to adjust whether to output the second gain control signal uart2.

[0313] For example, tx-en=1, the first power amplifier PA1 is turned on, and the second power amplifier PA2 is turned off. tx-en=0, the first power amplifier PA1 is turned off, and the second power amplifier PA2 is turned on. tx-en=0, the second controller 65 does not decode the modulation signal, and the second power amplifier PA2 amplifies according to the set gain. tx-en=1, the second controller 65 decodes the modulation signal and outputs the second gain control signal uart2 to control the gain of the first power amplifier PA1.

[0314] When the signal transmission system is used to send a signal to the antenna, tx-en=1, the first power amplifier PA1 is turned on, and the second power amplifier PA2 is turned off. At the same time, the second controller 65 decodes the modulated signal and outputs the second gain control signal uart2 to control the gain of the first power amplifier PA1. The RF signal transmitted by the T-Box to the fourth branch 4 is amplified by the first power amplifier PA1 and transmitted to the antenna through the V2X signal terminal to complete the signal transmission to the antenna.

[0315] It should be noted that, in combination with the above description of T-Box, the first gain control signal uart1 included in the modulation signal can be two signals. The first: the first gain control signal uart1 directly includes information indicating the specific gain value of the first power amplifier PA1. The second: the first gain control signal uart1 carries information that can obtain the specific gain value of the first power amplifier PA1. For the first case, the second controller 65 decodes the modulation signal, and the gain value can be directly obtained and output as the second gain control signal uart2. In this case, the line loss is known in advance, and the gain value is set, so that the signal transmission system can be adapted to different vehicles 100. For the second case, the second controller 65 decodes the modulation signal, and after processing the modulation signal and the signal input by the power detector 99, the gain value can be obtained and output as the second gain control signal uart2. In this case, there is no need to know the line loss in advance. The second controller 65 automatically calculates the line loss and outputs the adapted gain value so that the signal transmission system can adaptively adapt to different vehicles 100.

[0316] When the signal transmission system is used to receive the signal sent by the antenna, tx-en=0, the first power amplifier PA1 is turned off, and the second power amplifier PA2 is turned on. At the same time, the second controller 65 does not decode the modulated signal. The RF signal sent by the antenna is amplified by the second power amplifier PA2 and transmitted to the third combining point Q3, and the third combining point Q3 transmits the RF signal to the first combining point Q1 via a cable. The first RF isolation circuit 21 has a blocking effect on the RF signal, and the RF signal will not be transmitted to the second combining point Q2. However, the RF signal can be transmitted to the V2X circuit 61 via the first RF conduction circuit 11 to complete the reception of the antenna signal.

[0317] In some embodiments, the RF signal emitted by the V2X circuit 61 in the T-Box is set to have a conventional power, but under special instructions, the power of the RF signal emitted by the T-Box is adjustable, and the power of the RF signal emitted by the V2X circuit 61 in the T-Box can be adjusted to adapt to different scenarios.

[0318] In some embodiments, it is necessary to reduce the power of the RF signal emitted by the T-Box.

[0319] For example, when the vehicle 100 approaches the electronic toll collection (ETC) system, the frequency band of the RF signal can be adjusted to avoid the RF signal interfering with the ETC signal. Then, the T-Box determines whether the vehicle 100 is located at the ETC toll station. When the vehicle 100 is located at the ETC toll station, the T-Box adjusts (e.g., reduces) the power of the RF signal emitted by the V2X circuit 61, and the relay still performs gain compensation according to the original scheme to reduce the power of the RF signal received by the antenna and reduce interference.

[0320] The embodiment of the present application does not limit the method by which the T-Box determines whether the vehicle 100 is located at an ETC toll station, and all solutions in the related art are applicable to the embodiment of the present application. For example, the global positioning system (GPS) can be used to determine whether the vehicle 100 is located at an ETC toll station.

[0321] In other embodiments, it is necessary to increase the power of the radio frequency signal emitted by the T-Box.

[0322] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A vehicle-mounted communication terminal T-Box, characterized in that: include: A first branch (1) comprises a vehicle-to-anything (V2X) circuit (61) and a first radio frequency conduction circuit (11), wherein the first radio frequency conduction circuit (11) is coupled between the V2X circuit (61) and a first junction point (Q1); the V2X circuit (61) is used to send and receive radio frequency signals; The second branch (2) comprises a first control signal terminal (M1) and a first radio frequency isolation circuit (21), wherein the first radio frequency isolation circuit (21) is coupled between the first control signal terminal (M1) and the first junction point (Q1); the first control signal terminal (M1) is used to output a control signal; The first radio frequency conduction circuit (11) is used for passing the radio frequency signal and isolating the control signal, and the first radio frequency isolation circuit (21) is used for passing the control signal and isolating the radio frequency signal.

2. The T-Box according to claim 1, characterized in that: The first radio frequency isolation circuit (21) comprises a (1 / 4+N / 2)λ transmission line (X); a first end of the (1 / 4+N / 2)λ transmission line (X) is coupled to the first junction (Q1), and a second end of the (1 / 4+N / 2)λ transmission line (X) is coupled to a first node (P1); and the first node (P1) is coupled to the first control signal terminal (M1); Wherein, λ is the wavelength of the radio frequency signal, and N is an integer greater than or equal to 0.

3. The T-Box according to claim 2, characterized in that: The first radio frequency isolation circuit (21) further includes a first capacitor (C3) and a second capacitor (C4); The first end of the first capacitor (C3) and the first end of the second capacitor (C4) are both coupled to the reference ground voltage terminal (GND), and the second end of the first capacitor (C3) and the second end of the second capacitor (C4) are both coupled to the first node (P1).

4. The T-Box according to claim 1, characterized in that: The first radio frequency isolation circuit (21) comprises an isolator.

5. The T-Box according to any one of claims 1 to 4, characterized in that: The T-Box further comprises a third branch (3); The third branch (3) comprises a first power supply circuit (63), the first power supply circuit (63) is coupled to a second junction point (Q2), and the second junction point (Q2) is located between the first radio frequency isolation circuit (21) and the first control signal terminal (M1).

6. The T-Box according to claim 5, characterized in that: The first branch (1) further comprises a first AC-connected and DC-isolated circuit (41), wherein the first AC-connected and DC-isolated circuit (41) is coupled in series with the first radio frequency conduction circuit (11) and is connected between the V2X circuit (61) and the first junction point (Q1); and / or, The second branch (2) further comprises a second AC-passing and DC-isolating circuit (51), wherein the second AC-passing and DC-isolating circuit (51) is coupled between the first control signal terminal (M1) and the second combining point (Q2); and / or, The third branch (3) further comprises a first direct current-passing and alternating current-isolating circuit (31), wherein the first direct current-passing and alternating current-isolating circuit (31) is coupled between the first power supply circuit (63) and the second combining point (Q2).

7. The T-Box according to any one of claims 1 to 6, characterized in that: The first control signal terminal (M1) includes a first gain control signal terminal (UART1) and a first transceiver control signal terminal (TX-EN1).

8. The T-Box according to claim 7, characterized in that: The second branch (2) also includes a first controller (62), which is configured to output a first gain control signal (uart1) to the first gain control signal terminal (UART1) after receiving the transceiver control signal (tx-en) from the first transceiver control signal terminal (TX-EN1).

9. The T-Box according to claim 7 or 8, characterized in that: The first controller (62) is coupled to the first gain control signal terminal (UART1) and the first transceiver control signal terminal (TX-EN1), and the V2X circuit (61) is coupled to the first transceiver control signal terminal (TX-EN1).

10. The T-Box according to any one of claims 7 to 9, characterized in that: The second branch (2) further comprises a modulation circuit (70); The input end of the modulation circuit (70) is coupled to the first gain control signal end (UART1) and the first transceiver control signal end (TX-EN1), and the output end of the modulation circuit (70) is coupled to the first radio frequency isolation circuit (21).

11. The T-Box according to claim 10, characterized in that: The second branch (2) further comprises a carrier circuit (64), wherein the carrier circuit (64) is used to output a carrier signal; the carrier circuit (64) is coupled to an input end of the modulation circuit (70).

12. A relay, characterized in that: include: A fourth branch (4) comprises a vehicle-to-anything (V2X) signal terminal and a bidirectional switch circuit (13), wherein the bidirectional switch circuit (13) comprises a first path (L1) and a second path (L2) coupled in parallel between the V2X signal terminal and a third junction point (Q3), wherein the first path (L1) comprises a first power amplifier (PA1), and an output terminal of the first power amplifier (PA1) is coupled to the V2X signal terminal; and the V2X signal terminal is used to send and receive radio frequency signals; The fifth branch (5) comprises a second control signal terminal (M2) and a second radio frequency isolation circuit (22), wherein the second control signal terminal (M2) is coupled to the bidirectional switch circuit (13); the second radio frequency isolation circuit (22) is coupled between the second control signal terminal (M2) and the third junction point (Q3); the second control signal terminal (M2) is used to receive a control signal; and the second radio frequency isolation circuit (22) is used to pass the control signal and isolate the radio frequency signal.

13. The relay according to claim 12, characterized in that: The second control signal terminal (M2) includes a second gain control signal terminal (UART2) and a second transceiver control signal terminal (TX-EN2); the second gain control signal terminal (UART2) is coupled to the first power amplifier (PA1), and the second transceiver control signal terminal (TX-EN2) is coupled to the first path (L1) and the second path (L2), respectively.

14. The relay according to claim 13, characterized in that: The fifth branch (5) further includes a second controller (65) and a first frequency band blocking circuit (71); The first frequency band blocking circuit (71) is coupled between the second transceiver control signal terminal (TX-EN2) and a second node (P2), and the second node (P2) is coupled to the second radio frequency isolation circuit (22); The second controller (65) is configured to output a second gain control signal (uart2) to the second gain control signal terminal (UART2) after receiving the transceiver control signal (tx-en) of the second transceiver control signal terminal (TX-EN2) and the control signal of the second node (P2).

15. The relay according to claim 14, characterized in that: The output end of the second controller (65) is coupled to the second gain control signal end (UART2), and the input end of the second controller (65) is coupled to the second transceiver control signal end (TX-EN2) and the second node (P2).

16. The relay according to claim 14 or 15, characterized in that: The fifth branch (5) further includes a second frequency band blocking circuit (72), and the second frequency band blocking circuit (72) is coupled between the second node (P2) and the second radio frequency isolation circuit (22).

17. The relay according to any one of claims 14 to 16, characterized in that: The fifth branch (5) further includes a first signal enhancement circuit (90), wherein the first signal enhancement circuit (90) is coupled between the second controller (65) and the second node (P2); and / or, The fifth branch (5) further includes a second signal enhancement circuit, wherein the second signal enhancement circuit is coupled between the second controller (65) and the second transceiver control signal terminal (TX-EN2); and / or, The fifth branch (5) further comprises a third signal enhancement circuit, wherein the third signal enhancement circuit is coupled between the second node (P2) and the second radio frequency isolation circuit (22).

18. The relay according to any one of claims 14 to 17, characterized in that: The relay also includes a power detector (99), which is coupled to the input end of the second controller (65) and the third junction (Q3) respectively. The second controller (65) is also configured to receive a power signal sent by the power detector before outputting a second gain control signal (uart2) to the second gain control signal end (UART2).

19. The relay according to any one of claims 12 to 18, characterized in that: The second radio frequency isolation circuit (22) comprises a (1 / 4+N / 2)λ transmission line (X); a first end of the (1 / 4+N / 2)λ transmission line (X) is coupled to the third junction (Q3), a second end of the (1 / 4+N / 2)λ transmission line (X) is coupled to a third node (P3); the third node (P3) is coupled to the second control signal terminal (M2); Wherein, λ is the wavelength of the radio frequency signal, and N is an integer greater than or equal to 0.

20. The relay according to claim 19, characterized in that: The second radio frequency isolation circuit (22) further includes a third capacitor (C7) and a fourth capacitor (C8); The first end of the third capacitor (C7) and the first end of the fourth capacitor (C8) are both coupled to the reference ground voltage terminal (GND), and the second end of the third capacitor (C7) and the second end of the fourth capacitor (C8) are both coupled to the third node (P3).

21. The relay according to any one of claims 12 to 20, characterized in that: The second path (L2) includes a second power amplifier (PA2).

22. The relay according to any one of claims 12 to 21, characterized in that: The relay further comprises a sixth branch (6); The sixth branch (6) comprises a second power supply circuit (66), the second power supply circuit (66) is coupled to a fourth junction point (Q4), and the fourth junction point (Q4) is located between the second radio frequency isolation circuit (22) and the second control signal terminal (M2).

23. The relay according to claim 22, characterized in that: The fourth branch (4) further comprises a second radio frequency conduction circuit (12), wherein the second radio frequency conduction circuit (12) is coupled between the bidirectional switch circuit (13) and the third junction point (Q3); and / or, The fourth branch (4) further comprises a third AC-passing and DC-isolating circuit (42), wherein the third AC-passing and DC-isolating circuit (42) is coupled between the bidirectional switch circuit (13) and the third junction point (Q3); and / or, The fifth branch (5) further comprises a fourth AC-passing and DC-isolating circuit (52), wherein the fourth AC-passing and DC-isolating circuit (52) is coupled between the second control signal terminal (M2) and the fourth combining point (Q4); and / or, The sixth branch (6) further comprises a second direct current-passing and alternating current-isolating circuit (32), wherein the second direct current-passing and alternating current-isolating circuit (32) is coupled between the second power supply circuit (66) and the fourth junction point (Q4).

24. A signal transmission system, characterized in that: It comprises the T-Box described in any one of claims 1 to 11, a cable, and the relay described in any one of claims 12 to 23; one end of the cable is coupled to the first combining point (Q1) of the T-Box, and the other end of the cable is coupled to the third combining point (Q3) of the relay.

25. A vehicle, characterized in that: The invention comprises an antenna and the signal transmission system as claimed in claim 24, wherein the signal transmission system is coupled to the antenna.

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