Compensation amplification circuit of V2X equipment, V2X equipment and OBU equipment

Abstract

The invention discloses a V2X device compensation amplification circuit, a V2X device and an OBU device, the circuit comprises an active amplification circuit and an MCU circuit, the MCU circuit is used for generating a transmit-receive time sequence control signal Switch Control to control the active amplification circuit to transmit or receive a signal; sending a partial attenuation control signal ATTControl to dynamically adjust the attenuation of an adjustable attenuator in the active amplification circuit and maintain the outlet power of the active amplification circuit; the circuit further comprises a transmitting power detection circuit and an antenna detection circuit. According to the invention, on one hand, the power loss can be automatically compensated, so that the communication distance between V2X equipment is increased. And on the other hand, extra cable transmission power supply and control signals do not need to be added, and V2X equipment is convenient to install.

Description

Technical Field

[0001] This application relates to the field of active V2X compensation amplifier design technology, and in particular to a compensation amplifier circuit for a V2X device, a V2X device, and an OBU device. Background Technology

[0002] V2X (Vehicle to Everything), as a technology for vehicle-to-everything (V2X) cooperation, can greatly improve traffic efficiency and is currently widely used in the field of autonomous driving. OBU (On-Board Unit) devices, as V2X terminals, are installed on vehicles to enable communication between vehicles and between vehicles and the road. An OBU device typically consists of an OBU host, an external antenna, and corresponding peripheral power supply units, such as... Figure 1 As shown.

[0003] The OBU device is powered by the vehicle battery, the host computer handles communication signals and corresponding protocol processing, and the antenna performs wireless signal transmission and reception. Specifically, the V2X antenna typically consists of two independent passive V2X antennas, such as... Figure 2 As shown, the main antenna both transmits and receives signals, while the auxiliary antenna only receives signals. Typically, there are two 5m long RF cables outside the antenna, usually using automotive-grade FAKRA connectors.

[0004] The OBU (On-Board Unit) device is typically installed inside the vehicle, while the V2X passive antenna is mounted on the roof via a cable. Because V2X radio frequency operates at a relatively high frequency of 5.9 GHz, the radio frequency cable causes significant signal attenuation; especially when the vehicle is relatively large, the cable may be 5 meters long, resulting in an attenuation of nearly 10 dB; this reduces the communication distance to about one-third of its original value.

[0005] The solution in related technologies is to increase the transmission power to improve the communication distance. However, the V2X protocol standard has clear requirements for the terminal transmission power, with a maximum transmission power of 23dBm±2dB. Therefore, the transmission power cannot be further increased at the OBU module transmitter end. An amplifier can only be added at the V2X antenna end. However, adding an amplifier at the antenna end requires adding power supply lines and protocol signal control lines, which increases the difficulty and complexity of antenna installation. Summary of the Invention

[0006] This application provides a compensation amplifier circuit for a V2X device, a V2X device, and an OBU device to automatically compensate for power loss, thereby increasing the communication distance between V2X devices. Simultaneously, it eliminates the need for additional cables to transmit power and control signals, facilitating the installation of V2X devices.

[0007] The embodiments of this application adopt the following technical solutions:

[0008] In a first aspect, embodiments of this application provide a compensation amplifier circuit for a V2X device, wherein the circuit includes: an active amplifier circuit and an MCU circuit, the MCU circuit being used for...

[0009] Generate a transmit / receive timing control signal Switch_Control to control the active amplifier circuit to transmit or receive signals;

[0010] Send a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit.

[0011] The circuit also includes: a transmit power detection circuit and an antenna detection circuit.

[0012] The transmission power detection circuit is used to detect the V2X transmission signal power after attenuation through the cable, and output the detected power value signal to the MCU circuit.

[0013] The antenna detection circuit is used to detect whether the V2X antenna is in place or installed, and outputs the detection result to the MCU circuit.

[0014] In some embodiments, the active amplifier circuit includes: a transmitting channel and a receiving channel.

[0015] In the transmission channel, the transmission signal is switched to the transmission amplification circuit by the first switch: after passing through the adjustable attenuator, the fixed gain amplifier, and the filter in sequence, it reaches the output port through the second switch.

[0016] In the receiving channel, the signal received by the passive antenna is switched to the receiving amplification circuit by the second switch: after passing through the low noise amplifier and the filter in sequence, it is switched to the output port by the first switch.

[0017] In some embodiments, the MCU circuit is further used for

[0018] The first switch or the second switch is controlled by the transmit / receive timing control signal Switch_Control.

[0019] In some embodiments, the antenna detection circuit is further configured to determine whether the V2X antenna is in a preset position or whether it is installed by detecting the voltage of the partial attenuation control signal ANT_Detect.

[0020] When ANT_Detect is the first preset value, the antenna terminal resistor RANT is not connected, meaning there is no external antenna.

[0021] When ANT_Detect is the second preset value, the antenna at the antenna end is installed normally in the preset position;

[0022] When ANT_Detect is the third preset value, the antenna short circuit fault is not in the preset position.

[0023] In some embodiments, it is also used for

[0024] If the V2X antenna is detected to be not installed or short-circuited, the MCU will be put into sleep mode and the transceiver amplifiers in the active amplifier circuit will be powered off and stop working.

[0025] All units functioned normally after the V2X antenna was detected to be properly installed.

[0026] In some embodiments, the transmit power detection circuit is further used for

[0027] If the detected transmission signal is greater than a preset threshold, it is considered that the transmission moment has arrived and the MCU circuit is notified to control the active amplifier circuit to switch to the transmission amplification channel.

[0028] If the transmitted signal is detected to be no greater than a preset threshold, it is considered to be in the receiving phase and the MCU circuit is notified to switch to the receiving amplification channel.

[0029] In some embodiments, the preset threshold value is -10dBm.

[0030] In some embodiments, the compensation amplifier circuit is mounted close to the antenna.

[0031] Secondly, embodiments of this application also provide a V2X device, which includes the compensation amplifier circuit of the V2X device described in the first aspect.

[0032] Thirdly, embodiments of this application also provide an OBU device, which includes the compensation amplifier circuit of the V2X device described in the first aspect.

[0033] The at least one technical solution adopted in this application embodiment can achieve the following beneficial effects: The circuit includes an active amplifier circuit and an MCU circuit. The MCU circuit is used to generate a transmit / receive timing control signal Switch_Control to control the active amplifier circuit to transmit or receive signals; and to send a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit. The MCU circuit realizes the generation of the transmit / receive timing control signal and the processing of the partial attenuation control signal. The circuit also includes a transmit power detection circuit and an antenna detection circuit. The transmit power detection circuit is used to detect the V2X transmit signal power after cable attenuation and outputs the detected power value signal to the MCU circuit. The antenna detection circuit is used to detect whether the V2X antenna is in place or installed and outputs the detection result to the MCU circuit. The transmit power detection circuit and the antenna detection circuit can respectively detect the V2X transmit signal power and detect whether the V2X antenna is in place or installed, thereby controlling compensation when needed. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a schematic diagram of the circuit structure of V2X in related technologies;

[0036] Figure 2 A schematic diagram of power supply for V2X in related technologies;

[0037] Figure 3 This is a schematic diagram of the internal structure of the compensation amplifier circuit of the V2X device in the embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the compensation amplifier circuit of the V2X device in the embodiments of this application;

[0039] Figure 5 The pull-down resistor R in the embodiments of this application ANT A schematic diagram of the circuit principle;

[0040] Figure 6 This is a schematic diagram of the V2X host transmitting signal connected to a 5m radio frequency cable near the antenna in an embodiment of this application. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0043] This application provides a compensation amplifier circuit for a V2X device, such as... Figure 3 The diagram shows the internal structure of the compensation amplifier circuit of the V2X device in this embodiment. The circuit includes: an active amplifier circuit 310 and an MCU circuit 320. The MCU circuit 320 is used to generate a transmit / receive timing control signal Switch_Control to control the active amplifier circuit to transmit or receive signals; and to send a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit. It also includes: a transmit power detection circuit 330 and an antenna detection circuit 340. The transmit power detection circuit 330 is used to detect the power of the V2X transmit signal after cable attenuation and output the detected power value signal to the MCU circuit. The antenna detection circuit 340 is used to detect whether the V2X antenna is in place or installed and output the detection result to the MCU circuit.

[0044] It is understood that maintaining the output power of the active amplifier circuit can be either maintaining the output power at a stable value within a certain range or maintaining it at a fixed value. Both the stable value range and the fixed value can be adjusted according to the output power requirements.

[0045] Specifically, the MCU circuit 320, as the core control unit of the compensation amplifier circuit, mainly functions to generate the transmit / receive timing control signal Switch_Control and the transmit attenuation control signal ATT_Control. The Switch_Control signal controls the transmission and reception of signals. The ATT_Control signal ensures that the transmit output power remains a fixed value. Preferably, as... Figure 4As shown, the receiving section LNA in the active amplifier circuit is always in a fixed-gain amplification state. Additionally, the transmitting section PA is a fixed-gain amplifier. It first detects the transmitted signal power and then dynamically adjusts the attenuation of the adjustable attenuator based on the detected transmitted signal power to ensure that the output power is always 23dBm.

[0046] Furthermore, the transmit power detection circuit 330 detects the V2X transmit signal power after cable attenuation and then outputs the detected power value signal to the MCU circuit 320. It can be understood that the transmit power detection circuit 330 can be located at the amplifier input end, and its function is to detect the V2X transmit signal power after cable attenuation. The antenna detection circuit 340 detects whether the V2X antenna is in place or installed. The antenna detection circuit 340 is typically located at the amplifier output end, and its function is to detect whether the V2X antenna is in place or installed, and to notify the MCU circuit 320 of the detection result, thereby taking corresponding actions (such as the MCU circuit 320 entering sleep mode or normal operation). For example, it detects whether the V2X antenna is in place and properly installed, or not in place, or whether the antenna is short-circuited.

[0047] With the above circuit, without adding cables, the compensation amplifier circuit can dynamically and automatically compensate for power loss according to the actual line length, and can automatically generate protocol control signals, which can effectively make up for the signal loss caused by long-distance transmission, thereby increasing the communication distance of V2X devices.

[0048] With the above circuit, no additional control signal cables are needed in practical applications, thus facilitating the wiring of the entire vehicle.

[0049] The circuit described above includes an active amplifier circuit and an MCU circuit. The MCU circuit generates a transmit / receive timing control signal (Switch_Control) to control the active amplifier circuit to transmit or receive signals; and sends a partial attenuation control signal (ATT_Control) to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit. The MCU circuit generates the transmit / receive timing control signal and processes the partial attenuation control signal. The circuit also includes a transmit power detection circuit and an antenna detection circuit. The transmit power detection circuit detects the V2X transmit signal power after cable attenuation and outputs the detected power value to the MCU circuit. The antenna detection circuit detects whether the V2X antenna is in place or installed and outputs the detection result to the MCU circuit. The transmit power detection circuit and the antenna detection circuit can respectively detect the V2X transmit signal power and whether the V2X antenna is in place or installed, thereby enabling compensation control when needed.

[0050] Unlike related technologies that simply increase transmission power to extend communication distance, this circuit eliminates the need for additional cables to transmit power and control signals, simplifying the installation of V2X devices. The embodiment in this application uses only one cable.

[0051] Unlike related technologies where adding an amplifier at the antenna end requires additional power supply lines and protocol signal control lines, the MCU circuit described above generates the transmit / receive timing control signal Switch_Control to control the active amplifier circuit's transmission or reception of signals; it also sends a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit. The control signals are generated by the MCU circuit, and no additional equipment is required.

[0052] In one embodiment of this application, the active amplifier circuit 310 includes a transmitting channel and a receiving channel. In the transmitting channel, the transmitted signal is switched to the transmitting amplifier circuit via a first switch: after passing through an adjustable attenuator, a fixed gain amplifier, and a filter in sequence, it reaches the output port via a second switch. In the receiving channel, the signal received by the passive antenna is switched to the receiving amplifier circuit via a second switch: after passing through a low-noise amplifier and a filter in sequence, it reaches the output port via the first switch.

[0053] like Figure 4As shown, the active amplifier circuit 310 is used to perform V2X signal transmission and reception amplification functions. This part is the main signal channel and is equipped with a switch for switching. Specifically, in the transmission channel, the transmitted signal is attenuated by the cable and reaches the compensation amplifier circuit. It first passes through the switch to the transmission amplifier circuit section, then sequentially passes through the adjustable attenuator, fixed gain amplifier, and filter before reaching the output port through a switch. Similarly, in the receiving channel, the receiving link and the transmitting link are reverse processes. The signal received by the passive antenna goes directly to the compensation amplifier circuit, first passes through the switch to the receiving amplifier circuit section, then passes through the low-noise amplifier and filter before reaching the output port through a switch.

[0054] In one embodiment of this application, the MCU circuit 320 is further configured to control the switching of the first switch or the switching of the second switch via the transceiver timing control signal Switch_Control.

[0055] like Figure 4 As shown, the MCU circuit 320 transmits and receives the timing control signal Switch_Control to control the switching of the first switch or the second switch. Switching between different channels is achieved by switching the first switch or the second switch.

[0056] In one embodiment of this application, the antenna detection circuit is further configured to determine whether the V2X antenna is in a preset position or whether it is installed by detecting the voltage of the partial attenuation control signal ANT_Detect; when ANT_Detect is a first preset value, the antenna end resistor RANT is not connected, i.e., there is no external antenna; when ANT_Detect is a second preset value, the antenna at the antenna end is normally installed in the preset position; when ANT_Detect is a third preset value, the antenna end is short-circuited and is not in the preset position.

[0057] like Figure 5 As shown, Figure 5 Pull-down resistor R ANT Part of it is implemented at the V2X antenna end, and the rest is implemented inside the compensation amplifier. Antenna detection can be achieved by detecting the ANT_Detect signal voltage. Typically, R... ANT The value can be 20KΩ; specifically: when ANT_Detect is 5V, the antenna terminal resistance R can be determined. ANT If no connection is made, there is no external antenna. When ANT_Detect is 2.5V, it indicates that the external antenna is installed correctly. When ANT_Detect is 0V, it indicates a short circuit at the antenna end. The ANT_Detect signal is used to detect whether the V2X antenna is in place or installed, and the detection result is notified to the MCU unit, which then takes appropriate action.

[0058] In one embodiment of this application, the MCU is further configured to enter a sleep state and the transceiver amplifiers in the active amplifier circuit are powered down and do not work when the V2X antenna is detected to be not installed or to be short-circuited; when the V2X antenna is detected to be installed normally, all units work normally.

[0059] like Figure 4 As shown, when the compensation amplifier circuit of the V2X device detects that the V2X antenna is not installed or is short-circuited, the compensation amplifier can put the MCU into a sleep state and power down the transceiver amplifiers, thus maximizing power saving. After detecting that the V2X antenna is properly installed, all units of the compensation amplifier operate normally.

[0060] In one embodiment of this application, the transmit power detection circuit 330 is further configured to, when the transmitted signal is detected to be greater than a preset threshold, consider that it is a transmission moment and notify the MCU circuit to control the active amplifier circuit to switch to the transmit amplification channel; when the transmitted signal is detected to be less than the preset threshold, consider that it is a reception moment and notify the MCU circuit to switch to the receive amplification channel.

[0061] Considering that the V2X protocol uses TDD (Time Division Multiplexing) signals, and that transmission and reception require timing switching according to protocol requirements, it is generally necessary to use a timing switching control signal provided by the V2X device's main controller to control the two switches. This ensures that the compensation amplifier circuit switches to the transmit amplification channel at the transmit time and to the receive amplification channel at the receive time. Therefore, the V2X device needs to provide a dedicated control signal line connected to the compensation amplifier unit, which complicates system design and wiring.

[0062] like Figure 4 As shown, in the embodiments of this application, a power detection unit is used to identify the transmission and reception timing. Specifically, when the power detection unit detects that the transmission signal is greater than a certain preset value, it considers that it is at the transmission time and notifies the MCU to control the two switches to switch the circuit to the transmission amplification channel; otherwise, it considers that the system is at the reception time and the MCU controls the two switches to switch the circuit to the reception amplification channel.

[0063] In one embodiment of this application, the preset threshold value is -10dBm. The typical preset power detection value can be processed according to -10dBm. Specifically, it is determined based on the explicit requirements for terminal transmit power in the V2X protocol standard, with a maximum transmit power of 23dBm ± 2dB.

[0064] In one embodiment of this application, the compensation amplifier circuit is mounted close to the antenna.

[0065] In this embodiment, the compensation amplifier circuit compensates for the power loss caused by excessively long cables between the V2X device and the V2X antenna, which leads to a reduction in communication distance. Therefore, the compensation amplifier should be placed as close as possible to the V2X antenna when used in the system. Specifically, as shown below... Figure 6 As shown, the V2X host transmits signals via a 5m RF cable to the vicinity of the antenna. The signal first passes through a compensation amplifier and then is connected to the V2X antenna. The compensation amplifier should be installed as close to the antenna as possible.

[0066] An embodiment of this application provides a V2X device, which includes a compensation amplifier circuit for the V2X device.

[0067] The compensation amplifier circuit includes: an active amplifier circuit, an MCU circuit, and the MCU circuit is used for...

[0068] Generate a transmit / receive timing control signal Switch_Control to control the active amplifier circuit to transmit or receive signals;

[0069] Send a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit.

[0070] The circuit also includes: a transmit power detection circuit and an antenna detection circuit.

[0071] The transmission power detection circuit is used to detect the V2X transmission signal power after attenuation through the cable, and output the detected power value signal to the MCU circuit.

[0072] The antenna detection circuit is used to detect whether the V2X antenna is in place or installed, and outputs the detection result to the MCU circuit.

[0073] An embodiment of this application provides an OBU device, which includes a compensation amplification circuit for the V2X device. The compensation amplification circuit includes an active amplification circuit, an MCU circuit, and the MCU circuit itself, for use in...

[0074] Generate a transmit / receive timing control signal Switch_Control to control the active amplifier circuit to transmit or receive signals;

[0075] Send a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the output power of the active amplifier circuit.

[0076] The circuit also includes: a transmit power detection circuit and an antenna detection circuit.

[0077] The transmission power detection circuit is used to detect the V2X transmission signal power after attenuation through the cable, and output the detected power value signal to the MCU circuit.

[0078] The antenna detection circuit is used to detect whether the V2X antenna is in place or installed, and outputs the detection result to the MCU circuit.

[0079] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A compensation amplifier circuit for a V2X device, wherein: The circuit comprises: an active amplifier circuit and an MCU circuit, wherein the MCU circuit is used to Generate a transmit and receive timing control signal Switch_Control to control the active amplifier circuit to transmit or receive a signal; Sending a partial attenuation control signal ATT_Control to dynamically adjust the attenuation of the adjustable attenuator in the active amplifier circuit and maintain the outlet power of the active amplifier circuit; The circuit also includes: a transmission power detection circuit and an antenna detection circuit, The transmission power detection circuit is used to detect the power of the V2X transmission signal after cable attenuation, and output the detected power value signal to the MCU circuit; The antenna detection circuit is used to detect whether the V2X antenna is in place or installed, and output the detection result to the MCU circuit.

2. The circuit as claimed in claim 1, wherein: The active amplifier circuit includes: a transmitting channel and a receiving channel, In the transmitting channel, the transmitting signal is switched to the transmitting amplifier circuit through the first switch, and then passes through the adjustable attenuator, the fixed gain amplifier, and the filter in sequence, and then reaches the output port through the second switch; In the receiving channel, the signal received by the passive antenna is switched to the receiving amplification circuit through the second switch, and then passes through the low noise amplifier and the filter in sequence and reaches the output port through the first switch.

3. The circuit as claimed in claim 2, wherein: The MCU circuit is also used The first switch switching or the second switch switching is controlled by the transceiver timing control signal Switch_Control.

4. The circuit as claimed in claim 1, wherein: The antenna detection circuit is further used to determine whether the V2X antenna is in a preset position or installed by detecting the voltage of the partial attenuation control signal ANT_Detect; When ANT_Detect is the first preset value, the antenna terminal resistor RANT is not connected, that is, there is no external antenna; When ANT_Detect is the second preset value, the antenna at the antenna end is normally installed at the preset position; When ANT_Detect is the third preset value, the antenna terminal short circuit abnormality is not at the preset position.

5. The circuit as claimed in claim 1, wherein: Also used for When it is detected that the V2X antenna is not installed or is short-circuited, the MCU is put into a dormant state and the transceiver amplifiers in the active amplifier circuit are powered off and do not work; When it is detected that the V2X antenna is installed normally, all units work normally.

6. The circuit as claimed in claim 1, wherein: The transmission power detection circuit is also used When it is detected that the transmission signal is greater than the preset threshold value, it is considered to be at the transmission moment and the MCU circuit is notified to control the active amplifier circuit to switch to the transmission amplification channel; When it is detected that the transmission signal is not greater than the preset threshold value, it is considered to be at the receiving moment and the MCU circuit is notified to switch to the receiving amplification channel.

7. The circuit as claimed in claim 6, wherein: The preset threshold value is -10dBm.

8. The circuit as claimed in claim 1, wherein: The compensation amplifier circuit is installed close to the antenna.

9. A V2X device, wherein: A compensation amplifier circuit comprising the V2X device as claimed in any one of claims 1 to 8.

10. An OBU device, wherein: A compensation amplifier circuit comprising the V2X device as claimed in any one of claims 1 to 8.

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