T-box, relay, signal transmission system and vehicle

Abstract

Embodiments of the present application provide a T-Box, a relay, a signal transmission system and a vehicle, and relate to the technical field of communication, and are used for realizing that the T-Box synchronously transmits radio frequency signals and control signals to the relay through a cable. A first branch in the T-Box includes a V2X circuit and a first radio frequency conducting circuit, the first radio frequency conducting circuit is coupled between the V2X circuit and a first combining point. A second branch includes a first control signal end and a first radio frequency isolation circuit, 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 includes a vehicle-to-anything V2X signal end and a bidirectional switch circuit, the bidirectional switch circuit includes a first path and a second path which are coupled in parallel between the V2X signal end and a third combining point, the first path includes a first power amplifier. A fifth branch includes a second control signal end which is coupled with the bidirectional switch circuit; the second control signal end receives the control signal to control the gain of the first power amplifier.

Description

TECHNICAL FIELD

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

[0002] A vehicle to everything (V2X) system is a new generation of information communication technology that connects vehicles with everything. Vehicles rely on a telematics box (T-Box) supporting V2X technology as a transceiver of V2X information, and can form a V2X system with other things relying on a mature communication network architecture to realize V2X communication.

[0003] Since the distance between the external antenna of the vehicle and the T-Box is far, the higher the frequency, the greater the attenuation of the radio frequency signal. Excessive attenuation leads to a serious decline in the radio frequency performance of the vehicle. In order to alleviate the attenuation problem, the technical personnel in the field propose to use a relay to alleviate the attenuation. The relay amplifies and forwards the signal, increasing the radio frequency signal transmission capability.

[0004] However, in the current technology, the T-Box cannot send control signals to the relay, resulting in a lack of dynamic adjustment capability of the relay, such as a lack of dynamic adjustment of the gain, thereby causing the signal transmission system composed of the T-Box and the relay to be unable to dynamically match different vehicle models. SUMMARY

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

[0006] To achieve the above purpose, the technical scheme is as follows:

[0007] In a first aspect, the present application provides a T-Box, which is electrically connected with a relay coupled with an antenna. The T-Box includes a first branch and a second branch. The first branch includes a vehicle to everything (V2X) circuit and a first radio frequency conducting circuit, and the first radio frequency conducting circuit is coupled between the V2X circuit and a first combining point. The V2X circuit is used to send radio frequency signals when the T-Box is used to send signals, and is used to receive radio frequency signals when the T-Box is used to receive signals. The second branch includes a first control signal terminal and a first radio frequency isolation circuit, and the first radio frequency isolation circuit is coupled between the first control signal terminal and the first combining point. The first control signal terminal is used to output control signals. The first radio frequency conducting circuit is used to pass the radio frequency signals and isolate the control signals, and the first radio frequency isolation circuit is used to pass the control signals and isolate the radio frequency signals.

[0008] The T-Box provided by the embodiments of the present application has the following advantages. 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 for controlling the relay. The control signal can carry any information related to controlling the relay. The embodiments of the present application aggregate the control signal and the radio frequency signal by using a circuit structure, so that the T-Box can synchronously output the control signal when outputting the radio frequency signal. The control signal can be used to control the relay to adjust parameters such as gain. When the T-Box is applied to a signal transmission system, the T-Box can synchronously transmit the radio frequency signal and the control signal to the relay through a cable, without increasing the complexity of the signal transmission system, but enabling the relay to dynamically adjust its own parameters according to the control signal to match different vehicle models. Moreover, simulation shows that the loss of the radio frequency signal transmitted by the V2X circuit is low when the control signal is synchronously transmitted, and almost does not affect the radio frequency performance of the T-Box. In addition, the embodiments of the present application aggregate the control signal and the radio frequency signal by using the T-Box itself, and synchronously transmit the control signal and the radio frequency signal through a hardware circuit scheme without the need of additionally increasing large-size devices, thereby reducing the cost, meeting the demand for miniaturization, and being applicable to vehicles. For example, the control signal can carry information related to adjusting the gain of the relay, so as to adjust the gain of the relay according to different application scenarios to adapt to different cable attenuations, so that one set of signal transmission system can adapt to multiple vehicle models. Or for example, the control signal can carry information related to informing the relay to transmit and receive signals, so as to adjust the transmission and reception of the relay 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. A first end of the (1 / 4+N / 2)λ transmission line is coupled to the first combining point, and a 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. λ is the wavelength of the radio frequency signal, and N is an integer greater than or equal to 0. The (1 / 4+N / 2)λ transmission line is used to isolate multiple radio frequency signals, and the structure is simple and occupies a small area.

[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 radio frequency 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 end, and the second end of the first capacitor and the second end of the second capacitor are both coupled to the first node. The first capacitor and the second capacitor are used to compensate for the frequency deviation caused by the processing error of the (1 / 4+N / 2)λ transmission line, thereby optimizing the isolation effect of the radio frequency signal.

[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, which can be directly coupled in the T-Box, and the design is simple.

[0013] In a possible implementation, the T-Box further includes a third branch; the third branch includes a first power supply circuit, the first power supply circuit is coupled with the second combining point, and the second combining point is located between the first radio frequency isolation circuit and the first control signal end. Then, the signal aggregated in the first combining point includes the radio frequency signal, the control signal, and the power supply current, and a hardware circuit scheme is used to realize that the radio frequency signal, the control signal, and the power supply current can be synchronously transmitted through one cable, and a large-size device does not need to be additionally introduced, which has great market prospects.

[0014] In a possible implementation, the first branch further includes a first pass-through AC-to-DC isolation circuit, and the first pass-through AC-to-DC isolation circuit is coupled in series with the first radio frequency pass-through circuit between the V2X circuit and the first combining point.

[0015] By arranging the first pass-through AC-to-DC isolation circuit in the first branch, the radio frequency signal can pass through the first pass-through AC-to-DC isolation circuit, but the power supply current at the first combining point cannot be transmitted to the V2X circuit through the first pass-through AC-to-DC isolation circuit. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference on the radio frequency signal transmitted by the first branch can be reduced.

[0016] In a possible implementation, the first pass-through AC-to-DC isolation circuit includes a first DC blocking capacitor. In this way, the structure of the first pass-through AC-to-DC isolation circuit is simple, and the T-Box occupies a small area.

[0017] In a possible implementation, the second branch further includes a second pass-through AC-to-DC isolation circuit, and the second pass-through AC-to-DC isolation circuit is coupled between the first control signal end and the second combining point.

[0018] By arranging the second pass-through AC-to-DC isolation circuit in the second branch, the power supply current can be prevented from being transmitted in the second branch. That is, the power supply current cannot be transmitted to the first control signal end. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference on the control signal transmitted by the second branch can be reduced.

[0019] In a possible implementation, the second pass-through AC-to-DC isolation circuit includes a second DC blocking capacitor. In this way, the structure of the second pass-through AC-to-DC isolation circuit is simple, and the T-Box occupies a small area.

[0020] In a possible implementation, the third branch further includes a first pass-through DC-to-AC isolation circuit, and the first pass-through DC-to-AC isolation circuit is coupled between the first power supply circuit and the second combining point.

[0021] The power supply current output by the first power supply circuit in the third branch is transmitted to the first combining point, but the power supply current is isolated by the first pass-through AC-DC isolation circuit and cannot be transmitted to the first branch. At the same time, the power supply current is isolated by the second pass-through AC-DC isolation circuit and cannot be transmitted to the second branch, and there is almost no loss of power supply current. The first pass-through DC-AC isolation circuit can also isolate the control signal in the second branch, reducing the loss of the control signal.

[0022] In a possible implementation, the first pass-through DC-AC isolation circuit includes an equivalent inductor. In this way, the first pass-through DC-AC isolation circuit has a simple structure, and the T-Box has a small area.

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

[0024] In a possible implementation, the second branch further includes a first controller configured to output a first gain control signal to the first gain control signal end after receiving the transceiver control signal from the first transceiver control signal end. 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 end and the first transceiver control signal end, and the V2X circuit is coupled to the first transceiver control signal end. The first controller transmits the first gain control signal, so that the first gain control signal is adjustable to adapt to different application scenarios.

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

[0027] In a possible implementation, the second branch further includes a carrier circuit configured to output a carrier signal, and the carrier circuit is coupled to the input end of the modulation circuit. The carrier signal is set to carry and transmit the control signal, which assists the transmission of the control signal, and the transmission effect of the control signal can be improved.

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

[0029] In a possible implementation, the modulation circuit includes a first AND gate; inputs of the first AND gate are coupled with the first gain control signal end, the first transceiving control signal end and the carrier circuit; and an output of the first AND gate is coupled with the first radio frequency isolation circuit. The three-way signal is modulated by using the three-AND-gate structure, which is simple in structure and small in area.

[0030] In a possible implementation, the modulation circuit includes a second AND gate and a third AND gate; inputs of the second AND gate are coupled with two of the first gain control signal end, the first transceiving control signal end and the carrier circuit; an output of the second AND gate is coupled with an input of the third AND gate; the input of the third AND gate is further coupled with the remaining one of the first gain control signal end, the first transceiving control signal end and the carrier circuit; and an output of the third AND gate is coupled with the first radio frequency isolation circuit. The three-way signal is modulated by using the two-stage double-AND-gate structure, which is simple in principle.

[0031] In a possible implementation, the second branch further includes an operational amplifier, which is coupled between the modulation circuit and the first radio frequency isolation circuit. By arranging the operational amplifier at the output of the modulation circuit, the signal modulated by the modulation circuit can be amplified / attenuated and then transmitted to the first junction point, so as to meet the requirements in different application scenarios.

[0032] In a possible implementation, the first radio frequency on-circuit includes a band-pass filter. This is a simple structure, mature technology and low-cost implementation.

[0033] In a possible implementation, the second aspect of the embodiment of the application provides a relay, one end of the relay is configured to be electrically connected with the vehicle-mounted communication terminal, and the other end of the relay is configured to be electrically connected with the antenna. The relay includes a fourth branch and a fifth branch. The fourth branch includes a vehicle-to-everything (V2X) signal end and a bidirectional switch circuit, the bidirectional switch circuit includes a first path and a second path which are coupled in parallel between the V2X signal end and a third junction point, the first path includes a first power amplifier, and an output of the first power amplifier is coupled with the V2X signal end; the V2X signal end is configured to transmit a radio frequency signal when the relay is used for transmitting signals, and is configured to receive a radio frequency signal when the relay is used for receiving signals; the fifth branch includes a second control signal end and a second radio frequency isolation circuit, the second control signal end is coupled with the bidirectional switch circuit; the second radio frequency isolation circuit is coupled between the second control signal end and the third junction point; and the second control signal end is configured to receive a control signal; and the second radio frequency isolation circuit is configured to pass the control signal and isolate the radio frequency signal.

[0034] The relay provided by the embodiments of the present application receives the control signal sent by the T-Box, and controls and adjusts the relay itself in combination with the control signal, so that the relay has a dynamic adjustable function to meet the needs in different application scenarios. In the case that the control signal includes a first gain control signal, the relay can control and regulate the gain value of itself in combination with the first gain control signal to adapt to the line loss in different vehicles. In this way, a set of signal transmission system can adapt to different types of vehicles, and has high adaptability and low cost.

[0035] In a possible implementation, the second control signal end includes a second gain control signal end and a second transceiving control signal end; the second gain control signal end is coupled with the first power amplifier, and the second transceiving control signal end is coupled with the first path and the second path respectively. In this way, the relay can identify signals including gain control signals and transceiving control signals, and be controlled by these signals to optimize the performance of the relay.

[0036] In a possible implementation, the fifth branch further includes a second controller and a first frequency band blocking circuit; the first frequency band blocking circuit is coupled between the second transceiving control signal end and a second node, the second node is coupled with the second radio frequency isolation circuit; the second controller is configured to output a second gain control signal to the second gain control signal end after receiving the transceiving control signal of the second transceiving control signal end and the control signal of the second node. The second controller generates the second gain control signal according to the control signal containing the first gain control signal sent by the T-Box and the separated transceiving 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 with the second gain control signal end, and the input end of the second controller is coupled with the second transceiving control signal end and the second node. This way separates the modulated signal output by the T-Box, has a simple structure and small 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 radio frequency isolation circuit. In the case that the modulated signal includes a carrier signal, the relay can first block the carrier signal, so that the separation mode of the modulated signal can be simplified.

[0039] In a possible implementation, the fifth branch further includes a first signal enhancement circuit, and the first signal enhancement circuit is coupled between the second controller and the second node. By arranging 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, and the second signal enhancement circuit is coupled between the second controller and the second transceiver control signal end. By arranging the second signal enhancement circuit between the second controller and the second transceiver control signal end, the signal of the second transceiver control signal end 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, and the third signal enhancement circuit is coupled between the second node and the second radio frequency isolation circuit. By arranging the second signal enhancement circuit between the second node and the second radio frequency isolation circuit, the signal output by the second radio frequency 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 further includes a power detector, and the power detector is coupled with the input end of the second controller and the third combining point respectively, and the second controller is further configured to receive the 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 the second gain control signal based on the first gain control signal (characterizing the power intensity of the radio frequency signal output by the T-Box) and the power signal output by the power detector (characterizing the power intensity of the radio frequency signal after the line loss of the cable), so as to perform corresponding gain control on the first power amplifier. The length of the cable is different, and the gain value of the second gain control signal output by the second controller is also different, so that the signal transmission system has the function of adapting to different cable lengths, and the signal transmission system provided by the embodiment of the present application can be applied to vehicles with various lengths of cables.

[0043] In a possible implementation, the second radio frequency isolation circuit includes a (1 / 4+N / 2)λ transmission line, a first end of the (1 / 4+N / 2)λ transmission line is coupled with the third combining point, and a second end of the (1 / 4+N / 2)λ transmission line is coupled with the third node; the third node is coupled with the second 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 transmission line is used to realize the isolation of multiple radio frequency signals, and has the advantages of simple structure and small occupied area.

[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 has small occupied area and low cost.

[0045] In a possible implementation, the second radio frequency isolation circuit further includes a third capacitor and a fourth capacitor; a first end of the third capacitor and a first end of the fourth capacitor are coupled to the reference ground voltage terminal, and a second end of the third capacitor and a second end of the fourth capacitor are coupled to the third node. By arranging the third capacitor and the fourth capacitor, the frequency band deviation caused by the processing error of the (1 / 4+N / 2) lambda transmission line can be compensated, and the isolation effect on the radio frequency 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, and the second power supply circuit is coupled to the fourth combining point between the second radio frequency isolation circuit and the second control signal terminal. The relay includes the sixth branch, and the power supply current transmitted by the T-Box can be received to supply power to the relay, so that the structure is simple and the cost is low.

[0048] In a possible implementation, the fourth branch further includes a second radio frequency on-off circuit, and the second radio frequency on-off circuit is coupled between the bidirectional switch circuit and the third combining point. The second radio frequency on-off circuit in the fourth branch can filter out signals of other frequency bands, and attenuate the interference of the out-of-band signal through the radio frequency signal.

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

[0050] In a possible implementation, the third on-off filter circuit includes a third filter capacitor. In this way, the structure of the third on-off filter circuit is simple, and the relay occupies a small area.

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

[0052] In a possible implementation, the fourth on-off filter circuit includes a fourth filter capacitor. In this way, the structure of the fourth on-off filter circuit is simple, and the relay occupies a small area.

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

[0054] In a possible implementation, the second pass-through isolation circuit includes an equivalent inductor. In this way, the second pass-through isolation circuit has a simple structure, and occupies a small area of the relay.

[0055] In a third aspect, the present application provides a signal transmission system, including the T-Box of any one of the first aspect, the cable, and the relay of any one of the second aspect; one end of the cable is coupled with the first combining point of the T-Box, and the other end of the cable is coupled with the third combining point of the relay. The system provided by the present application includes the T-Box of the first aspect and the relay of the second aspect, and has the same beneficial effects as the T-Box and the relay, which will not be repeated here.

[0056] In a fourth aspect, the present application provides a vehicle, including an antenna and the signal transmission system of the third aspect, and the signal transmission system is coupled with the antenna. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 An application scenario of V2X provided by the present application;

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

[0059] Figures 3-6 A framework diagram of a T-Box provided by the present application;

[0060] Figure 7A An architecture diagram of a transmission line network provided by the present application;

[0061] Figure 7B A modulation result diagram of a modulation circuit provided by the present application; Figure 6 A simulation diagram of isolation effect of the first radio frequency isolation circuit on a radio frequency signal;

[0062] Figure 7C Another modulation result diagram of a modulation circuit provided by the present application; Figure 6 A simulation diagram of isolation effect of the first radio frequency isolation circuit on a radio frequency signal;

[0063] Figures 8-12 A framework diagram of a T-Box provided by the present application;

[0064] Figure 13 A modulation result diagram of a modulation circuit provided by the present application;

[0065] Figures 14-20 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 with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0067] Hereinafter, the terms “second”, “first”, and the like are only used for description convenience, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “second”, “first”, and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0068] In addition, in the embodiments of the present application, the orientation terms such as “upper”, “lower”, “left”, “right”, and the like can include but not limited to the orientation defined by the relative placement of the components in the drawings. It should be understood that these directional terms can be relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the placement of the components in the drawings.

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

[0070] In the embodiments of the present application, “and / or” describes the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character “ / ” generally represents that the associated objects before and after it have an “or” relationship.

[0071] First, in order to facilitate understanding, the related terms and concepts that may be involved in the embodiments of the present application will be introduced first.

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

[0073] V2X is used to realize information interaction between vehicles and all entities that can affect vehicles, so as to reduce accidents, alleviate traffic congestion, reduce environmental pollution, and provide other information services. For example,Figure 1 As shown, V2X includes four parts: vehicle to network (V2N) communication is the most widely used form of vehicle networking at present, and its main function is to enable vehicles to connect to cloud servers through mobile networks, and use the navigation, entertainment, anti-theft and other application functions provided by the cloud server. Vehicle to vehicle (V2V) communication can be used for information exchange and warning between vehicles, and the most typical application is used for vehicle-to-vehicle collision avoidance safety systems. Vehicle to infrastructure (V2I) communication is that vehicles can communicate with roads and even other infrastructure, such as traffic lights, roadblocks, etc., to obtain road management information such as traffic light signal timing. Vehicle to pedestrian (V2P) communication is used for safety warning to pedestrians or non-motor vehicles on the road.

[0074] At present, V2X technology can be a car-related dedicated short-range communication (DSRC) defined in institute of electrical and electronics engineers (IEEE) 802.11p, or a cellular vehicle networking (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 schemes provided by the embodiments 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 are also not beyond the application scenario coverage of the embodiments of the present application.

[0075] From the network status and the technical advantages of C-V2X evolution, C-V2X should be the preferred domestic V2X technology standard. C-V2X can be divided into two communication modes, direct mode (V2X-direct) and cellular mode (V2X-cellular), according to the interface. V2X-direct is based on the D2D (device-to-device) ProSe (Proximity Services) in the LTE standard, through the PC5 interface, using the vehicle networking dedicated frequency band (protocol defined as B47 5.9GHz), realizing direct communication between vehicles, roads and people, with low latency and high support for mobile speed, but it needs good resource allocation and congestion control algorithm. In the environment without LTE network coverage, adjacent devices can communicate directly. V2X-cellular uses LTE broadcast, transmits through the cellular network UU interface, 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, expand their perception range, detect hidden threats, and ensure that important warning information is timely and correctly pushed at critical moments. V2X technology not only helps improve vehicle safety performance and improve road traffic efficiency, but also promotes the development of automatic driving technology.

[0077] (2) Telematics Box (T-Box)

[0078] The T-Box is a communication component (or device) in the vehicle information system. The T-Box is mainly used for communication with other devices and / or other electronic equipment in the vehicle, to realize the display of vehicle information and the control of the vehicle by using electronic equipment. The component is installed in the vehicle, accesses the mobile operator network through the built-in communication module, connects the vehicle body network through the automobile bus, connects the car machine through the Ethernet / Wi-Fi / USB interface data channel, and shares mobile data with the driver and passengers in the vehicle through the car machine Wi-Fi.

[0079] Figure 2 A framework of a vehicle is provided for the embodiments of the present application.

[0080] As Figure 2 shown, the vehicle 100 provided by the embodiments of the present application includes a T-Box, a cable, a relay and an antenna.

[0081] The T-Box is coupled with the antenna through a cable. The V2X circuit in the T-Box transmits a radio frequency signal, and the radio frequency signal is transmitted between the T-Box and the antenna. Since the T-Box is usually front-mounted in the vehicle 100, and the antenna is usually rear-mounted in the vehicle 100, the distance between the T-Box and the antenna is usually relatively far. The higher the frequency, the greater the attenuation of the radio frequency signal, and excessive attenuation leads to a serious decline in the radio frequency performance of the vehicle.

[0082] Based on this, as shown in FIG. 1, a relay is added in the vehicle 100. The relay is located between the T-Box and the antenna. The relay amplifies and forwards the radio frequency signal, increases the transmission capacity of the radio frequency signal, and weakens the attenuation of the radio frequency signal. Figure 2

[0083] The T-Box, the cable, and the relay constitute a signal transmission system. The signal transmission system is coupled with the antenna, so that the vehicle 100 realizes the V2X function.

[0084] However, since one T-Box needs to be adapted to multiple vehicle models, the positions of the antenna and the relay are different for each vehicle model, and the gain of the relay for the radio frequency signal also needs to be different.

[0085] To solve the above problems, those skilled in the art design relays with different gain values to adapt to different lengths of cables, and fix the gain of the relay to adapt to different cable attenuations.

[0086] The gain value of the relay is fixed, and different vehicle models use different configurations of the relay. Although this can meet the demand, the adaptation scheme is complex, and each vehicle model needs to develop separate adaptation software, which increases the cost.

[0087] Based on this, the embodiments of the present application provide a signal transmission system. The signal transmission system includes a T-Box, a cable, and a relay. One end of the cable is coupled with the T-Box, and the other end of the cable is coupled with 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 adapt to different vehicles 100.

[0088] Next, the T-Box and the relay in the signal transmission system will be described schematically, and then the signal transmission system will be described schematically.

[0089] Example one

[0090] Figure 3 A frame diagram of a T-Box provided by the embodiments of the present application is provided.

[0091] The embodiments of the present application provide a T-Box. The T-Box is electrically connected with a relay coupled with an antenna. As shown in FIG. 2, the T-Box includes a processor 201, a memory 202, a radio frequency (RF) circuit 203, and a power management integrated circuit (PMIC) 204. 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 radio frequency conducting circuit 11, and the first radio frequency conducting circuit 11 is coupled between the V2X circuit 61 and a first combining point Q1.

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

[0094] When the T-Box transmits signals, the V2X circuit 61 is configured to output radio frequency signals, and the radio frequency signals output by the V2X circuit 61 are transmitted to the first combining point Q1 through the first radio frequency conducting circuit 11. When the T-Box receives signals, the V2X circuit 61 is configured to receive radio frequency signals, and the first combining point Q1 transmits the radio frequency signals to the V2X circuit 61 through the first radio frequency conducting circuit 11.

[0095] It can also be understood that the first branch 1 transmits radio frequency signals, and the radio frequency signals can be transmitted from the V2X circuit 61 to the first combining point Q1, or the radio frequency signals can be transmitted from the first combining point Q1 to the V2X circuit 61.

[0096] The embodiments of the present application do not limit the structure of the V2X circuit 61, and the V2X circuit (also referred to as a V2X module) in related technologies is applicable to the embodiments of the present application.

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

[0098] The first control signal terminal M1 is configured to output control signals, and the control signals include, for example, a first gain control signal, a transceiver control signal, and the like. When the distance between the T-Box and the antenna changes, the control signals can control the gain of the relay to adjust the gain of the relay in combination with the specific scene.

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

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

[0101] So, when the T-Box is used for transmitting signals, the radio frequency 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 outputted. When the T-Box is used for receiving signals, the radio frequency signal is received by the first combining point Q1 and then split into the first branch 1.

[0102] In some embodiments, the radio frequency 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 make the signals on the first branch 1 and the second branch 2 not interfere with each other, the first radio frequency pass-through circuit 11 in the first branch 1 is used to pass the radio frequency signal and isolate the control signal. The first radio frequency isolation circuit 21 in the second branch 2 is used to pass the control signal and isolate the radio frequency signal.

[0105] That is, based on the T-Box shown in the figure, when the T-Box is used for transmitting signals: Figure 3

[0106] The radio frequency signal outputted by the V2X circuit 61 in the first branch 1 is transmitted to the first combining point Q1 through the first radio frequency pass-through circuit 11, but the radio frequency signal is isolated by the first radio frequency isolation circuit 21 and almost cannot be transmitted to the first control signal end M1, and there is almost no loss of the radio frequency signal.

[0107] In the second branch 2, the control signal outputted by the first control signal end M1 is transmitted to the first combining point Q1 through the first radio frequency isolation circuit 21, but the control signal is isolated by the first radio frequency pass-through circuit 11 and almost cannot be transmitted to the V2X circuit 61, and there is almost no loss of the control signal.

[0108] When the T-Box is used for receiving signals:

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

[0110] The radio frequency signal in the first combining point Q1 is isolated by the first radio frequency isolation circuit 21 and almost cannot be transmitted to the first control signal end M1, but the radio frequency signal can be transmitted to the V2X circuit 61 through the first radio frequency pass-through circuit 11 to realize the separation of the radio frequency signal to the first branch 1.

[0111] The control signal in the first combining point Q1 is isolated by the first radio frequency pass-through circuit 11 and cannot be transmitted to the V2X signal end, but the control signal can be transmitted to the first control signal end M1 through the first radio frequency isolation circuit 21 to realize the separation of the control signal in the aggregated signal to the second branch 2.

[0112] ​In the embodiments of the present application, the first combining point Q1 may be coupled with a 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, as shown in Figure 3 The T-Box further includes a connector 80, and the T-Box is coupled with a cable through the connector 80, and the first combining point Q1 is coupled with the connector 80.

[0114] In the T-Box provided by the embodiments 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 for controlling the relay. The control signal can carry any information related to controlling the relay. The embodiments of the present application aggregate the control signal and the radio frequency signal, so that the T-Box can synchronously output the control signal when outputting the radio frequency signal. The control signal can be used to control the relay to adjust parameters such as gain. When the T-Box is applied to a signal transmission system, the T-Box can synchronously transmit the radio frequency signal and the control signal to the relay through a cable, without increasing the complexity of the signal transmission system, but the relay can dynamically adjust its parameters according to the control signal to match different vehicle models. Moreover, simulation shows that the loss of the radio frequency signal transmitted by the V2X circuit 61 is low when the control signal is synchronously transmitted, and almost does not affect the radio frequency performance. In addition, the embodiments of the present application aggregate the control signal and the radio frequency signal through the T-Box itself, and synchronously transmit the control signal and the radio frequency signal through a hardware circuit scheme, without the need to additionally increase large-size devices, reduce costs, meet the demand for miniaturization, and can be applied to vehicles. For example, the control signal can carry information related to adjusting the gain of the relay, so as to adjust the gain of the relay according to different application scenarios, to adapt to different cable attenuations, so that a set of signal transmission systems can adapt to multiple vehicle models. And / or, the control signal can carry information related to informing the relay to transmit and receive signals, so as to adjust the transmission and reception of the relay according to different application states.

[0115] Figure 4 A framework schematic diagram of a T-Box provided by the embodiments of the present application is shown in

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

[0117] The third branch 3 includes a first power supply circuit 63, and the first power supply circuit 63 is coupled with a second combining point Q2, and the second combining point Q2 is located between the first radio frequency isolation circuit 21 and a first control signal end M1.

[0118] The first power supply circuit 63 is configured to transmit a direct current. The first power supply circuit 63 can supply power to the T-Box, and the first power supply circuit 63 can also transmit the direct current to the relay through the cable to supply power to the relay.

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

[0120] Therefore, the signals aggregated in the first combining point Q1 include the radio frequency signal, the control signal, and the power supply current. The hardware circuit scheme can be used to realize that one cable can synchronously transmit the radio frequency signal, the control signal, and the power supply current, and does not need to additionally introduce a large-size device, which has a great market prospect.

[0121] The first power supply circuit 63 is configured to provide a direct current of 1A. The structure of the first power supply circuit 63 is not limited in the embodiments of the present application, and the circuit for providing a direct current in the related art is suitable for the embodiments of the present application.

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

[0123] Since the radio frequency signal and the control signal are both alternating currents, the direct current output by the first power supply circuit 63 can be transmitted to the second combining point Q2 through the first AC / DC conversion circuit 31, and then transmitted to the first combining point Q1. However, the radio frequency 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 AC / DC conversion circuit 31.

[0124] In this way, the loss of the radio frequency signal and the control signal can be reduced.

[0125] In some embodiments, please continue to refer to Figure 4 The first branch 1 further includes a first DC / AC conversion circuit 41, and the first DC / AC conversion circuit 41 is coupled in series with the first radio frequency conducting circuit 11 between the V2X circuit 61 and the first combining point Q1.

[0126] Figure 4 For example, the first radio frequency conducting circuit 11 is coupled close to the V2X circuit 61, and the first DC / AC conversion circuit 41 is coupled close to the first combining point Q1. Alternatively, the first radio frequency conducting circuit 11 can be coupled close to the first combining point Q1, and the first DC / AC conversion circuit 41 can be coupled close to the V2X circuit 61.

[0127] By setting the first pass-through isolation circuit 41 in the first branch 1, the radio frequency signal can pass through the first pass-through isolation circuit 41, but the power supply current at the first combining point Q1 (for example, the power supply current transmitted by the first power supply circuit 63 to the first combining point Q1) cannot be transmitted to the V2X circuit 61 through the first pass-through isolation circuit 41. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference generated by the radio frequency signal transmitted by the first branch 1 can be weakened.

[0128] In some embodiments, please continue to refer to Figure 4 , the second branch 2 further comprises a second pass-through isolation circuit 51 coupled between the first control signal end M1 and the second combining point Q2.

[0129] That is, the second pass-through isolation circuit 51 is coupled to the end of the first radio frequency isolation circuit 21 away from the first combining point Q1.

[0130] The radio frequency signal, the control signal, and the 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 desirable for the radio frequency signal to 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, and the radio frequency signal at the first combining point Q1 cannot be transmitted to the second combining point Q2, but the power supply current can be transmitted to the second combining point Q2. Therefore, by setting the second pass-through isolation circuit 51 in the second branch 2, the transmission of the power supply current in the second branch 2 can be prevented. That is, the power supply current cannot be transmitted to the first control signal end M1. On the one hand, the loss of the power supply current can be reduced, and on the other hand, the interference generated by the control signal transmitted by the second branch 2 can be weakened.

[0131] Based on the circuit structure shown in Figure 4 , when the T-Box is used to transmit signals:

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

[0133] In the second branch 2, the control signal output by the first control signal end M1 is transmitted to the first combining point Q1, but the control signal is isolated by the first radio frequency pass-through circuit 11 and cannot be transmitted to the first branch 1. At the same time, the control signal is isolated by the first pass-through isolation circuit 31 and cannot be transmitted to the third branch 3, and there is almost no loss of the control signal.

[0134] In the third branch 3, the power supply current output by the first power supply circuit 63 is transmitted to the first combining point Q1, but the power supply current is isolated by the first pass-through direct-current isolation circuit 41 and cannot be transmitted to the first branch 1. At the same time, the power supply current is isolated by the second pass-through direct-current isolation circuit 51 and cannot be transmitted to the second branch 2, and there is almost no loss of power supply current.

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

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

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

[0138] It should be noted here that, Figure 4 The first pass-through direct-current isolation circuit 31, the first pass-through direct-current isolation circuit 41, and the second pass-through direct-current isolation circuit 51 in the T-Box shown are presented in dashed lines, indicating that the T-Box provided in the embodiments of the present application can not include the above three circuit modules, or can only include one or two of the above three circuit modules, and is not limited to the T-Box must contain all of the above three circuit modules.

[0139] Figure 5 And Figure 6 A topological structure diagram of a T-Box provided in the embodiments of the present application.

[0140] Based on the above-mentioned T-Box architecture, as Figure 5 In some embodiments, the first radio frequency pass-through circuit 11 includes a bandpass filter.

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

[0142] In some embodiments, the first pass-through direct-current isolation circuit 31 includes an equivalent inductor L.

[0143] In some embodiments, the first pass-through direct-current isolation circuit 41 includes a first direct-current isolation capacitor C1.

[0144] For example, the capacitance value of the first direct-current isolation capacitor C1 is nfa level.

[0145] In some embodiments, the second pass-through direct-current isolation circuit 51 includes a second direct-current isolation capacitor C2.

[0146] For example, the capacitance value of the second direct-current isolation capacitor C2 is nfa level.

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

[0148] In some embodiments, as shown in FIG. 1, the first radio frequency isolation circuit 21 is an isolator. Figure 5

[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 in the T-Box, which is simple in design.

[0151] In other embodiments, as shown in FIG. 2, the first radio frequency 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 the first combining point Q1, a second end of the (1 / 4+N / 2)λ transmission line X is coupled to the first node P1, and the first node P1 is coupled to the second combining point Q2. Figure 6 In the formula, λ is the wavelength of the radio frequency signal, and N is an integer greater than or equal to 0.

[0152] For example, N=0, and the first radio frequency isolation circuit 21 includes a 1 / 4λ transmission line. Alternatively, for example, N=1, and the first radio frequency isolation circuit 21 includes a 3 / 4λ transmission line. Alternatively, for example, N=2, and the first radio frequency isolation circuit 21 includes a (1 / 4+1)λ transmission line. Alternatively, for example, N=3, and the first radio frequency isolation circuit 21 includes a (3 / 4+1)λ transmission line, and so on.

[0153] The transmission line is used to isolate multiple radio frequency signals, which has a simple structure and small occupied area.

[0154] In some embodiments, the T-Box further includes a circuit board, which can be a printed circuit board (PCB), for example.

[0155] In some embodiments, the first branch 1, the second branch 2, and the third branch 3 are disposed on the circuit board.

[0156] In other embodiments, among the first branch 1, the second branch 2, and the third branch 3, in addition to the (1 / 4+N / 2)λ transmission line X, other devices are disposed on the circuit board, and the (1 / 4+N / 2)λ transmission line X is integrated inside the circuit board.

[0157] In this way, the T-Box has a small occupied area and low cost.

[0158] Please continue to refer to

[0159] Figure 6 ​​In some embodiments, the first radio frequency 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 end 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) lambda 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 setting the first capacitor C3 and the second capacitor C4, the frequency band deviation caused by the processing error of the (1 / 4+N / 2) lambda transmission line X can be compensated, and the isolation effect of the radio frequency signal can be optimized.

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

[0164] By setting the capacitance of the first capacitor C3 and the second capacitor C4 to pF level, the radio frequency signal can have a better isolation effect.

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

[0166] The capacitance of the first capacitor C3 and the second capacitor C4 is equal, which can make the first node P1 as the endpoint of the first radio frequency isolation circuit 21, and improve the compensation accuracy of the processing error of the (1 / 4+N / 2) lambda transmission line X.

[0167] Figure 7A The architecture diagram of the transmission line network provided by the embodiments of the present application is shown in the figure; Figure 7B The first radio frequency isolation circuit 21 provided by the embodiments of the present application is shown in the figure; Figure 6 The isolation effect simulation diagram of the radio frequency signal of the first radio frequency isolation circuit 21 is shown in the figure; Figure 7C The first radio frequency isolation circuit 21 provided by the embodiments of the present application is shown in the figure; Figure 6 The isolation effect simulation diagram of the radio frequency signal of the first radio frequency isolation circuit 21 is shown in the figure.

[0168] As shown in the figure, Figure 7A In the transmission line theory, a transmission line with a characteristic impedance of Z0 has a terminal connected to a load with an impedance of Z L , and the two constitute a network.

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

[0170] The input impedance Z looking into this network I The input impedance Z looking into this network I becomes:

[0171]

[0172] where β = 2π / λ, λ is the wavelength of the propagating signal 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-circuited, then Z I = 0. If the T-Box is short-circuited, then Z I = ∞. Therefore, when the (1 / 4 + N / 2)λ transmission line X is used to connect the main channel (the first branch 1) and the branches (the second branch 2 and the third branch 3), there is almost no attenuation of the radio frequency signal on the main channel.

[0175] As shown in Figure 7B , it is found through simulation that, taking the T-Box as an example, the radio frequency signal is detected between the first hybrid junction point Q1 and the connector 80, and the attenuation of the radio frequency signal is about -0.025. These attenuations include the attenuation of the radio frequency signal caused by the devices and signal lines between the V2X circuit and the sampling point, and the attenuation of the radio frequency signal by the first radio frequency isolation circuit 21. Therefore, the attenuation of the radio frequency signal of 5.9GHz by the first radio frequency isolation circuit 21 is very small. As shown in Figure 7C , the radio frequency signal is detected between the first node P1 and the second hybrid junction point Q2, and the attenuation of the radio frequency signal is about -24. Therefore, the radio frequency signal is almost not transmitted to the second hybrid junction point Q2 through the first radio frequency isolation circuit 21.

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

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

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

[0179] As shown in Figure 8As shown, in some embodiments, the first control signal terminal M1 comprises a first gain control signal terminal UART1. The second branch 2 further comprises a first controller 62 coupled with the first gain control signal terminal UART1, and the first controller 62 is configured to send a first gain control signal uart1 to the first gain control signal terminal UART1.

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

[0181] For example, the V2X circuit 61 comprises a modem, and the modem is configured to output the transceiving control signal tx-en.

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

[0183] For example, when the first controller 62 receives the transceiving control signal tx-en indicating that the T-Box is transmitting a radio frequency signal, the first controller 62 sends the first gain control signal uart1 to the first gain control signal terminal UART1, and the first gain control signal uart1 is used to represent the gain adjustment value of the relay to the radio frequency signal.

[0184] When the first controller 62 receives the transceiving control signal tx-en indicating that the T-Box is receiving a radio frequency signal, the first controller 62 does not send the first gain control signal uart1.

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

[0186] In addition, in some embodiments, the first gain control signal uart1 can be a signal directly representing the gain value of the relay, and after receiving the first gain control signal uart1, the relay can directly obtain the gain value.

[0187] Therefore, for different vehicles 100, simulation detection can be performed before leaving the factory, and the gain value 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 directly represents a gain value of 2. For the second type of vehicle, the first gain control signal uart1 directly represents a gain value of 3.

[0189] In other embodiments, the first gain control signal uart1 can also be a signal carrying a gain value, and after receiving the first gain control signal uart1, further processing of the first gain control signal uart1 is still needed to obtain the gain value.

[0190] Then, for different vehicles 100, the first gain control signal uart1 issued by the first controller 62 can be the same, and the first gain control signal uart1 is further generated by the first controller 62 according to different cable lengths to generate a gain control signal representing a gain value. In this way, the signal transmission system can be self-adapted to different vehicles 100.

[0191] Figure 9 A schematic diagram of a T-Box framework is provided for embodiments of the present application.

[0192] As shown in Figure 9 some embodiments, the first control signal end M1 further includes a first transceiver control signal end TX-EN1, which is coupled with the V2X circuit 61 and used to receive a 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 end TX-EN1 and output a first gain control signal uart1 to the first gain control signal end UART1.

[0194] For example, the first controller 62 is coupled with the first gain control signal end UART1 and the first transceiver control signal end 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 with 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 with the first radio frequency isolation circuit 21.

[0196] In the case where the second branch 2 further includes the second pass-through isolation circuit 51, a second end of the modulation circuit 70 is coupled with the second pass-through isolation circuit 51.

[0197] In other words, the modulation circuit 70 modulates the first gain control signal uart1 and the first transmit / receive control signal tx-en, and then transmits them in the second branch 2. Therefore, in the second branch 2, in addition to the first gain control signal uart1, the first transmit / receive control signal tx-en can also be transmitted.

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

[0199] The input terminal of the first AND gate AND1 is coupled to both the first gain control signal terminal UART1 and the first transmit / receive control signal terminal TX-EN1, and the output terminal of the first AND gate AND1 is coupled to the first radio frequency 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 modulates the first gain control signal and the first transmit / receive control signal with an AND, so that the modulated signal output by the first AND gate AND1 contains the information of the first gain control signal and the first transmit / receive control signal.

[0201] After the transmit / receive control signal tx-en transmitted from the first transmit / receive control signal terminal TX-EN1 and the first gain control signal uart1 transmitted from the first gain control signal terminal UART1 are modulated by the modulation circuit 70, the second branch 2 can synchronously transmit the first transmit / receive control signal tx-en and the first gain control signal uart1 to the first combining point Q1 and transmit them through the cable. This increases the amount of information in the aggregated signal transmitted through the cable, eliminating the need for a separate first transmit / receive control signal tx-en branch.

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

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

[0204] Figure 10 This is a schematic diagram of a T-Box frame provided in an embodiment of this application.

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

[0206] The carrier signal outputted by the carrier circuit 64 is a clock signal clk in an example. For example, the clock signal clk is a signal with a frequency of hundreds of megahertz. For example, the clock signal clk is a signal with a frequency of 125 MHz. Of course, the clock signal clk can also be a signal with another frequency.

[0207] For example, the carrier circuit 64 is a clock oscillator, which is configured to generate the clock signal clk with a frequency of 125 MHz. Of course, the clock oscillator can also generate a clock signal with another frequency, as long as the frequency of the clock signal is different from the frequency of the radio frequency signal.

[0208] Then, as shown in FIG. 1, the input end of the first AND gate AND1 is coupled with the first gain control signal end UART1 and the carrier circuit 64, and the output end of the first AND gate AND1 is coupled with the first radio frequency 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. Figure 10

[0209] By setting the carrier signal to carry the control signal, the transmission effect of the control signal can be improved. By using the clock signal as the carrier signal, the clock signal can be separated from the first gain control signal after the gain is received, and the data is not easily lost during the separation.

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

[0211] As shown in FIG. 1, in some embodiments, the second branch 2 includes the carrier circuit 64, and the first control signal end M1 includes the first gain control signal end UART1 and the first transceiver control signal end TX-EN1. Figure 11 In this case, the modulation circuit 70 includes the first AND gate AND1, which can be understood as a triple AND gate in an example.

[0212] The input end of the first AND gate AND1 is coupled with 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 with the second radio frequency isolation circuit 51 or the operational amplifier OP.

[0213] 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.

[0214]

[0215] Figure 12 ​​A schematic diagram of a framework of a T-Box is provided in the embodiments of the present application.

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

[0217] The input end of the second AND gate AND2 is coupled with two of the carrier circuit 64, the first transceiving control signal end TX-EN1 and the first gain control signal end UART1, and the output end of the second AND gate AND2 is coupled with the input end of the third AND gate AND3.

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

[0219] It can also be understood that, after two of the carrier circuit 64, the first transceiving control signal end TX-EN1 and the first gain control signal end UART1 are coupled with the second AND gate AND2, the other one is coupled with the output end of the second AND gate AND2 and the third AND gate AND3. The embodiments of the present application do not limit which two of the carrier circuit 64, the first transceiving control signal end TX-EN1 and the first gain control signal end UART1 are coupled with the second AND gate AND2 first, Figure 12 It is only a schematic diagram.

[0220] For example, as shown in Figure 12 The carrier circuit 64 and the first transceiving control signal end TX-EN1 are coupled with the input end of the second AND gate AND2, the output end of the second AND gate AND2 and the first gain control signal end UART1 are coupled with the input end of the third AND gate AND3, and the output end of the third AND gate AND3 is coupled with the second AC / DC conversion circuit 51 or the operational amplifier OP.

[0221] Alternatively, the carrier circuit 64 and the first gain control signal end UART1 are coupled with the input end of the second AND gate AND2, the output end of the second AND gate AND2 and the first transceiving control signal end TX-EN1 are coupled with the input end of the third AND gate AND3.

[0222] Alternatively, the first gain control signal end UART1 and the first transceiving control signal end TX-EN1 are coupled with the input end of the second AND gate AND2, the output end of the second AND gate AND2 and the carrier circuit 64 are coupled with the input end of the third AND gate AND3.

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

[0224] Figure 13 The horizontal axis is time, and the vertical axis is voltage. From top to bottom, the waveforms are the signal of the carrier circuit 64, the signal of the first transceiving control signal end TX-EN1, the signal of the first gain control signal end UART1, and the modulated signal. After being modulated by the modulation circuit 70, the modulated signal contains the signal of the carrier circuit 64, the signal of the first transceiving control signal end TX-EN1, and the signal of the first gain control signal end UART1, and one signal carries three kinds of information.

[0225] Example Two

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

[0227] The embodiment of the present application provides a relay, one end of the relay is electrically connected with a vehicle-mounted communication terminal, and the other end of the relay is electrically connected with an antenna. Figure 14 As shown in the figure, the relay includes a fourth branch 4 and a fifth branch 5.

[0228] The fourth branch 4 includes a vehicle-to-everything (V2X) signal end and a bidirectional switch circuit 13. The bidirectional switch circuit 13 includes a first path L1 and a second path L2 which are coupled in parallel between the V2X signal end and a third combining point Q3. The first path L1 includes a first power amplifier (PA1), and an output end of the first power amplifier PA1 is coupled with the V2X signal end.

[0229] The V2X signal end is coupled with the antenna, and is used for transmitting and receiving radio frequency signals. The V2X signal end can be used for receiving radio frequency signals, and the V2X signal end can also be used for transmitting radio frequency signals. The radio frequency signals can be the same as those in Example One, which will not be described herein again.

[0230] When the relay is used for receiving radio frequency signals transmitted by the T-Box, the third combining point Q3 receives the radio frequency signals, which are transmitted to the V2X signal end through the first path L1 (the first power amplifier PA1). When the relay is used for transmitting signals to the T-Box, the radio frequency signals transmitted by the V2X signal end are transmitted to the third combining point Q3 through the second path S2.

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

[0232] The bidirectional switch circuit refers to a circuit containing a bidirectional line, signals can be transmitted in two directions, but signals can only be transmitted in one direction at the same time, and signals cannot be transmitted in two directions 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 for receiving signals, the first path L1 is turned on. When the relay is used for transmitting signals, the second path S2 is turned on.

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

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

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

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

[0239] Then, when the relay is used for transmitting signals, the radio frequency signal transmitted by the fourth branch 4 is output through the third combining point Q3. When the relay is used for receiving signals, the radio frequency signal in the aggregated signal (including the radio frequency signal and the control signal) transmitted by the third combining point Q3 is transmitted to the V2X signal end through the fourth branch 4, and the control signal (that is, the modulation signal mentioned above) in the aggregated signal is transmitted to the second control signal end M2 through 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 radio frequency isolation circuit 22 in the fifth branch 5 is used to pass the control signal and isolate the radio frequency signal.

[0241] In some embodiments, the fourth branch 4 further includes a second radio frequency turn-on circuit 12, which is coupled between the bidirectional switch circuit 13 and the third combining point Q3. The second radio frequency turn-on circuit 12 is used to pass the radio frequency signal and isolate the control signal.

[0242] For example, the second radio frequency turn-on circuit 12 includes a band-pass filter. The second radio frequency turn-on circuit 12 can be the same as the first radio frequency turn-on circuit 11, or they can be different.

[0243] In some embodiments, as shown in FIG. 1, the second path S2 in the bidirectional switch circuit 13 includes a second power amplifier PA2. Figure 14

[0244] For example, 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, which can be that the second control signal terminal M2 is 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 amplification multiple 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] Alternatively, for 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] Then, as shown in FIG. 1, 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. Figure 15 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 the requirement.

[0250] In some embodiments, the relay further includes a connector 80.

[0251] One end of the connector 80 is coupled to the third combining point Q3, and the other end of the connector 80 is used to be coupled to a cable.

[0252] In some embodiments, as shown in FIG. 1, the fifth branch 5 further includes a second controller 65 and a first frequency band blocking circuit 71.

[0253] Figure 15 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.

[0254] 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.

[0255] ​​The first frequency band blocking circuit 71 has a blocking frequency band matching the frequency band of the first gain control signal uartl, and is configured to block the first gain control signal uartl and transmit the transceiving control signal tx-en.

[0256] In an example, the first frequency band blocking circuit 71 comprises a low-pass filter or a detector.

[0257] The control signal received by the third combining point Q3 comprises the first gain control signal uartl and the transceiving 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 uartl and transmits the transceiving control signal tx-en to the second transceiving control signal end TX-EN2 through the transceiving control signal tx-en. The second transceiving control signal end TX-EN2 is coupled to the bidirectional switch circuit 13, and is configured 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 receive the transceiving control signal tx-en of the second transceiving 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.

[0259] In an 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 transceiving control signal end TX-EN2 and the second node P2. The second controller 65 is configured to receive the transceiving control signal tx-en of the second transceiving 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 transceiving 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 transceiving control signal tx-en of the second transceiving control signal end TX-EN2 are both transmitted to the second controller 65, and the second controller 65 determines whether to relay a signal for transmission or a signal for reception based on the transceiving control signal tx-en. When relaying a signal for reception, the second controller 65 decodes the modulation signal to generate the second gain control signal uart2, and the second gain control signal uart2 is transmitted to the bidirectional switch circuit 13 to control the gain of the first power amplifier PA1. When relaying a signal for transmission, the second controller 65 does not decode the modulation signal, and the gain of the second power amplifier PA2 is a set gain.

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

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

[0263] As shown in FIG. 5, in some embodiments, the fifth branch 5 further includes a second frequency band blocking circuit 72 coupled between the second node P2 and the second radio frequency isolation circuit 22. Figure 16 The second frequency band blocking circuit 72 has a blocking frequency band matching a frequency band of a carrier signal (e.g., a clock signal clk) for blocking the carrier signal, and is controlled by the first gain control signal uartl and the transceiving control signal tx-en.

[0264] The second frequency band blocking circuit 72 has a blocking frequency band matching a frequency band of a carrier signal (e.g., a clock signal clk) for blocking the carrier signal, and is controlled by the first gain control signal uartl and the transceiving control signal tx-en.

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

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

[0267] Then, the modulated signal transmitted by the second radio frequency isolation circuit 22 is first blocked by the second frequency band blocking circuit 72 to remove the clock signal clk, and the first gain control signal uartl and the transceiving control signal tx-en are transmitted to the second node P2 for transmission 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 uartl and transmits the transceiving control signal tx-en to the second transceiving control signal end TX-EN2. The second controller 65 identifies the first gain control signal uartl and outputs the second gain control signal uart2.

[0268] Figure 17 A schematic diagram of a relay framework provided by an embodiment of the present application.

[0269] In some embodiments, as shown in FIG. 5, the fifth branch 5 further includes a first signal enhancement circuit 90 coupled between the second controller 65 and the second node P2. Figure 17 The first signal enhancement circuit 90 is configured to enhance the signal of the second node P2 before transmitting the signal to the second controller 65, and the enhancement manner includes but is not limited to amplification. The structure of the first signal enhancement circuit 90 is not limited in the embodiments of the present application, and any circuit capable of enhancing signal strength is applicable to the embodiments of the present application.

[0270] By arranging 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 before being transmitted to the second controller 65, so as to improve the accuracy of signal processing.

[0271] By arranging 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 before being 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, which 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 before transmitting it to the second controller 65. The enhancement method includes, but is not limited to, amplification. This application embodiment does not limit the structure of the second signal enhancement circuit; any circuit capable of enhancing signal strength is applicable to this application embodiment.

[0274] By setting 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, thereby improving the accuracy of the signal.

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

[0276] The third signal enhancement circuit is used to enhance the modulated signal output from the second RF isolation circuit 22 before outputting it. The enhancement method includes, but is not limited to, amplification. This application embodiment does not limit the structure of the third signal enhancement circuit; any circuit capable of enhancing signal strength is applicable to this application embodiment.

[0277] By setting a second signal enhancement circuit between the second node P2 and the second radio frequency isolation circuit 22, the signal output by the second radio frequency isolation circuit 22 can be enhanced before being transmitted to the second node P2, thereby improving the accuracy of the signal.

[0278] Figure 18 This is a framework diagram of a relay provided in an embodiment of this application.

[0279] In some embodiments, such as Figure 18 As shown, the relay also includes a power detector 99, which is coupled to the second controller 65 and the third combining point Q3 respectively. The second controller 65 is also configured to receive the 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 based on the first gain control signal uart1 and the power signal.

[0281] The power detector 99, for example, can be a power detection pressure tube. The power detector 99 is configured to convert the strength of the radio frequency signal at the third combining point Q3 into a voltage value, determine the power of the radio frequency signal according to the voltage value, and inform the second controller 65 of the power signal. The second controller 65 outputs the second gain control signal uart2 based on the first gain control signal uart1 (representing the power strength of the radio frequency signal output by the T-Box) and the power signal output by the power detector 99 (representing the power strength of the radio frequency signal after the cable line loss), to perform corresponding gain control on the first power amplifier PA1. The length of the cable is different, and the gain value of the second gain control signal uart2 output by the second controller 65 is also different, so that the signal transmission system has the function of adapting to different cable lengths, and the signal transmission system provided by the embodiment of the present application can be applied to vehicles 100 of various cable 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, the second controller 65 stores a comparison table of line loss and gain), 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 them is within the acceptable line loss range.

[0283] For example, the power detector 99 can be coupled to the third combining point Q3. Alternatively, for example, the power detector 99 can be coupled between the second radio frequency conducting circuit 12 and the bidirectional switch circuit 13. The power detector 99 can receive the radio frequency signal.

[0284] Of course, in some embodiments, the relay can also not include the power detector 99. The T-Box has a pre-known line loss for different cable lengths, and outputs a first gain control signal uart1 matched with the line loss, which 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 be pre-set with the first gain control signal uart1. The signal transmission system provided by the embodiment of the present application can still be applied to vehicles 100 of various cable lengths.

[0285] Figure 19 A topology diagram of a relay provided by an embodiment of the present application.

[0286] In some embodiments, as shown in Figure 19 The relay further includes a sixth branch 6 including a second power supply circuit 66.

[0287] The second power supply circuit 66 is coupled with the fourth combining point Q4, which is located between the second radio frequency isolation circuit 22 and the second control signal terminal M2.

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

[0289] The second power supply circuit 66 is configured to receive a direct current. After receiving the direct current, the second power supply circuit 66 can convert the direct current and supply the relay, or directly supply the relay. The embodiments of the present application do not make any limitation in this regard.

[0290] In some embodiments, as shown in Figure 19 The fourth branch 4 further includes a third pass-through AC blocking DC circuit 42, which is coupled between the bidirectional switch circuit 13 and the third combining point Q3.

[0291] The embodiments of the present application do not make any limitation on the structure of the third pass-through AC blocking DC circuit 42. For example, the third pass-through AC blocking DC circuit 42 includes a third AC blocking capacitor C5, which can have the same structure as the first AC blocking capacitor C1.

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

[0293] The embodiments of the present application do not make any limitation on the structure of the fourth pass-through AC blocking DC circuit 52. For example, the fourth pass-through AC blocking DC circuit 52 includes a fourth AC blocking capacitor C6, which can have the same structure as the second AC blocking capacitor C2.

[0294] In some embodiments, the sixth branch 6 further includes a second pass-through DC blocking AC circuit 32, which is coupled between the second power supply circuit 66 and the fourth combining point Q4.

[0295] The embodiments of the present application do not make any limitation on the structure of the second pass-through DC blocking AC circuit 32. For example, the second pass-through DC blocking AC circuit 32 includes an equivalent inductor L.

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

[0297] For example, as shown in Figure 19As shown, the second radio frequency 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 with the third combining point Q3, and a second end of the (1 / 4+N / 2)λ transmission line X is coupled with the third node P3. The third node P3 is coupled with a fourth node Q4, and the fourth node Q4 is coupled with the second control signal end M2 and the second power supply circuit 66, respectively.

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

[0299] 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 end 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.

[0300] The relay provided by the embodiments of the present application receives the control signal sent by the T-Box, and controls and adjusts the relay itself in combination with the control signal, so that the relay has a dynamically adjustable function to meet the needs in different application scenarios. In the case where the control signal includes a first gain control signal, the relay can adjust the gain value of itself 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 system can adapt to various different vehicles 100, and has high adaptability and low cost.

[0301] Example Three

[0302] Figure 20 An architecture diagram of a signal transmission system provided by the embodiments of the present application.

[0303] The embodiments of the present application provide a signal transmission system, as shown in Figure 20 As shown, the signal transmission system includes a T-Box, a cable, and a relay, and two ends of the cable are coupled with the connector 80 in the T-Box and the connector 80 in the relay, respectively.

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

[0305] The V2X signal end of the relay in the signal transmission system is used to be coupled with an antenna, and when the signal transmission system is applied to a vehicle, the antenna is a 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 One, and the relay in the signal transmission system includes any one of the relays shown in Example Two, Figure 20 which is only an illustration and is not limited in any way.

[0307] In the following,Figure 20 For example, the communication process of the signal transmission system is schematically described.

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

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

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

[0311] The modulated signal in the aggregated signal is isolated by the second radio frequency isolation circuit 12 and cannot reach the fourth branch 4. However, the modulated signal can reach the fourth node Q4 through the second radio frequency isolation circuit 22. After reaching the fourth node Q4, the modulated signal is isolated by the second pass-through 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. 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 transceiving control signal tx-en output by the first transceiving 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 transceiving 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 transceiving control signal terminal TX-EN2, but the transceiving control signal tx-en can be transmitted to the second transceiving control signal terminal TX-EN2. The transceiving control signal tx-en is transmitted to the bidirectional switch circuit 13 through the second transceiving control signal terminal TX-EN2 to control the first power amplifier PA1 in the bidirectional switch circuit 13 to be turned on and the second control amplifier PA2 to be turned off. At the same time, the modulation signal composed of the first gain control signal uart1 and the transceiving control signal tx-en at the second node P2 is transmitted to the second controller 65, and the transceiving control signal tx-en of the second transceiving 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 transceiving control signal tx-en to determine 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 transmit signals 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 modulation signal and outputs the second gain control signal uart2 to control the gain of the first power amplifier PA1. The radio frequency signal transmitted by the T-Box to the fourth branch 4 is amplified by the first power amplifier PA1 and then 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 the T-Box, the first gain control signal uartl included in the modulated signal can be two signals. The first: the first gain control signal uartl directly contains information indicating the specific gain value of the first power amplifier PA1. The second: the first gain control signal uartl 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 modulated 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 adapt to different vehicles 100. For the second case, the second controller 65 decodes the modulated signal, and after processing the modulated 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, and the second controller 65 automatically calculates the line loss and outputs the adaptive gain value to make the signal transmission system self-adaptive to different vehicles 100.

[0316] When the signal transmission system is used to receive signals transmitted 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 radio frequency signal transmitted 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 radio frequency signal to the first combining point Q1 through the cable. The first radio frequency isolation circuit 21 has a blocking effect on the radio frequency signal, and the radio frequency signal will not be transmitted to the second combining point Q2. However, the radio frequency signal can be transmitted to the V2X circuit 61 through the first radio frequency on circuit 11 to complete the reception of the antenna signal.

[0317] In some embodiments, the radio frequency signal emitted by the V2X circuit 61 in the T-Box is set to a regular power, but under special instructions, the power of the radio frequency signal emitted by the T-Box is adjustable. By adjusting the power of the radio frequency signal emitted by the V2X circuit 61 in the T-Box, different scenes can be adapted.

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

[0319] For example, when the vehicle 100 approaches an electronic toll collection (ETC) system, in order to avoid interference of the radio frequency signal with the ETC signal, the frequency band of the radio frequency signal can be adjusted. Then, the T-Box determines whether the vehicle 100 is located at the ETC station. In the case that the vehicle 100 is located at the ETC station, the T-Box adjusts (for example, reduces) the power of the radio frequency signal emitted by the V2X circuit 61, and the relay still performs gain compensation according to the original scheme, so as to reduce the power of the radio frequency signal received by the antenna and weaken the interference.

[0320] The embodiments of the present application do not limit the manner in which the T-Box determines whether the vehicle 100 is located at the ETC station, and the solutions in the related art are all applicable to the embodiments of the present application. For example, whether the vehicle 100 is located at the ETC station can be determined by a global positioning system (GPS).

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

[0322] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A vehicle-mounted communication terminal (T-Box), characterized by comprising: The T-Box is used to be connected with a relay coupled with an antenna; the T-Box comprises: A first branch (1) comprising a vehicle-to-anything (V2X) circuit (61) and a first radio frequency (RF) conducting circuit (11), the first RF conducting circuit (11) being coupled between the V2X circuit (61) and a first combining point (Q1); the V2X circuit (61) is used to send and receive RF signals; A second branch (2) comprising a first control signal end (M1) and a first RF isolation circuit (21), the first RF isolation circuit (21) being coupled between the first control signal end (M1) and the first combining point (Q1); the first control signal end (M1) is used to output a control signal; The first RF conducting circuit (11) is used to pass the RF signals and isolate the control signals, and the first RF isolation circuit (21) is used to pass the control signals and isolate the RF signals.

2. The T-Box of claim 1, wherein, The first RF 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 with the first combining point (Q1), and a second end of the (1 / 4+N / 2)λ transmission line (X) is coupled with a first node (P1); the first node (P1) is coupled with the first control signal end (M1); Wherein, λ is the wavelength of the RF signals, and N is an integer greater than or equal to 0.

3. The T-Box of claim 2, wherein, The first RF isolation circuit (21) further comprises a first capacitor (C3) and a second capacitor (C4); A first end of the first capacitor (C3) and a first end of the second capacitor (C4) are both coupled with a reference ground voltage end (GND), and a second end of the first capacitor (C3) and a second end of the second capacitor (C4) are both coupled with the first node (P1).

4. The T-Box of claim 1, wherein, The first RF isolation circuit (21) comprises an isolator.

5. The T-Box of any of claims 1-4, wherein, The T-Box further comprises a third branch (3); The third branch (3) comprises a first power supply circuit (63), and the first power supply circuit (63) is coupled with a second combining point (Q2), and the second combining point (Q2) is located between the first RF isolation circuit (21) and the first control signal end (M1).

6. The T-Box of claim 5, wherein, The first branch (1) further comprises a first pass-intercept-direct circuit (41), and the first pass-intercept-direct circuit (41) is coupled in series with the first RF conducting circuit (11) between the V2X circuit (61) and the first combining point (Q1); And / or, The second branch (2) further comprises a second pass-intercept-direct circuit (51), and the second pass-intercept-direct circuit (51) is coupled between the first control signal end (M1) and the second combining point (Q2); And / or, The third branch (3) further comprises a first pass-direct-intercept circuit (31), and the first pass-direct-intercept circuit (31) is coupled between the first power supply circuit (63) and the second combining point (Q2).

7. The T-Box of any of claims 1-4, wherein, The first control signal end (M1) comprises a first gain control signal end (UART1) and a first transceiver control signal end (TX-EN1).

8. The T-Box of claim 7, wherein, The second branch (2) further comprises a first controller (62), configured to output a first gain control signal (uart1) to the first gain control signal terminal (UART1) after receiving a transceiving control signal (tx-en) to the first transceiving control signal terminal (TX-EN1).

9. The T-Box of claim 8, wherein, The first controller (62) is coupled with the first gain control signal terminal (UART1) and the first transceiving control signal terminal (TX-EN1), and the V2X circuit (61) is coupled with the first transceiving control signal terminal (TX-EN1).

10. The T-Box of claim 7, wherein, The second branch (2) further comprises a modulation circuit (70); An input terminal of the modulation circuit (70) is coupled with the first gain control signal terminal (UART1) and the first transceiving control signal terminal (TX-EN1), and an output terminal of the modulation circuit (70) is coupled with the first radio frequency isolation circuit (21).

11. The T-Box of claim 10, wherein, The second branch (2) further comprises a carrier circuit (64) for outputting a carrier signal, and the carrier circuit (64) is coupled with an input terminal of the modulation circuit (70).

12. A relay, characterized by, One end of the relay is configured to be electrically connected with the vehicle-mounted communication terminal, and the other end of the relay is configured to be electrically connected with the antenna; the relay comprises: A fourth branch (4) comprising a vehicle-to-anything (V2X) signal terminal and a bidirectional switch circuit (13), the bidirectional switch circuit (13) comprising a first path (L1) and a second path (L2) coupled in parallel between the V2X signal terminal and a third combining point (Q3), the first path (L1) comprising a first power amplifier (PA1), and an output terminal of the first power amplifier (PA1) being coupled with the V2X signal terminal; the V2X signal terminal being configured to transmit and receive radio frequency signals; A fifth branch (5) comprising a second control signal terminal (M2) and a second radio frequency isolation circuit (22), the second control signal terminal (M2) being coupled with the bidirectional switch circuit (13); the second radio frequency isolation circuit (22) being coupled between the second control signal terminal (M2) and the third combining point (Q3); the second control signal terminal (M2) being configured to receive a control signal; and the second radio frequency isolation circuit (22) being configured to pass the control signal and isolate the radio frequency signals.

13. The relay of claim 12, wherein, The second control signal terminal (M2) comprises a second gain control signal terminal (UART2) and a second transceiving control signal terminal (TX-EN2); the second gain control signal terminal (UART2) is coupled with the first power amplifier (PA1), and the second transceiving control signal terminal (TX-EN2) is coupled with the first path (L1) and the second path (L2) respectively.

14. The relay of claim 13, wherein, The fifth branch (5) further comprises a second controller (65) and a first frequency band blocking circuit (71); The first frequency band blocking circuit (71) is coupled between the second transceiving control signal terminal (TX-EN2) and a second node (P2), and the second node (P2) is coupled with the second radio frequency isolation circuit (22); The first frequency band blocking circuit (71) is coupled between the second transceiving control signal terminal (TX-EN2) and a second node (P2), and the second node (P2) is coupled with 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 a transceiving control signal (tx-en) to the second transceiving control signal terminal (TX-EN2) and the control signal of the second node (P2).

15. The relay of claim 14, wherein, An output terminal of the second controller (65) is coupled to the second gain control signal terminal (UART2), and an input terminal of the second controller (65) is coupled to the second transceiving control signal terminal (TX-EN2) and the second node (P2).

16. The relay of claim 14, wherein, The fifth branch (5) further comprises a second frequency band blocking circuit (72) coupled between the second node (P2) and the second radio frequency isolation circuit (22).

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

18. The relay of any of claims 14-16, wherein, The relay further comprises a power detector (99) coupled to the input terminal of the second controller (65) and the third combining point (Q3), respectively, and the second controller (65) is further 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).

19. The relay of any of claims 12-16, wherein, 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 combining point (Q3), and 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 of claim 19, wherein, The second radio frequency isolation circuit (22) further comprises 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 a 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 of any of claims 12-16, wherein, The second path (L2) comprises a second power amplifier (PA2).

22. The relay of any of claims 12-16, wherein, The relay further comprises a sixth branch (6). The sixth branch (6) comprises a second power supply circuit (66), which is coupled with a fourth combining point (Q4) between the second radio frequency isolation circuit (22) and the second control signal terminal (M2).

23. The relay of claim 22, wherein, The fourth branch (4) further comprises a second radio frequency conducting circuit (12), which is coupled between the bidirectional switch circuit (13) and the third combining point (Q3); and / or, The fourth branch (4) further comprises a third conducting-interchange-isolating circuit (42), which is coupled between the bidirectional switch circuit (13) and the third combining point (Q3); and / or, The fifth branch (5) further comprises a fourth conducting-interchange-isolating circuit (52), which 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 conducting-isolating-interchange circuit (32), which is coupled between the second power supply circuit (66) and the fourth combining point (Q4).

24. A signal transmission system, characterized by A T-Box, a cable, and a relay according to any one of claims 1-23; one end of the cable is coupled with the first combining point (Q1) of the T-Box, and the other end of the cable is coupled with the third combining point (Q3) of the relay.

25. A vehicle characterized by A signal transmission system according to claim 24, which is coupled with an antenna. A signal transmission system according to claim 24, which is coupled with an antenna.

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