Antenna diagnosis circuit, vehicle-mounted antenna module and vehicle

Abstract

The utility model relates to the field of antenna diagnosis, and provides an antenna diagnosis circuit, a vehicle-mounted antenna module and a vehicle. The antenna diagnosis circuit comprises a constant current source module, an antenna detection module and a control module. Wherein the constant current source module is connected with the antenna, the antenna detection module is connected with the constant current source module, and the control module is connected with the antenna detection module; wherein the constant current source module provides electric energy for the antenna, the antenna detection module performs electric signal sampling on the constant current source module to obtain a first sampling electric signal, and the control module determines an in-place state and / or a fault state of the antenna according to the first sampling electric signal. According to the antenna diagnosis circuit provided by the invention, the fault state of the antenna is directly determined, so that the fault detection result is more accurate, the antenna diagnosis circuit is suitable for antenna diagnosis schemes of more antenna fault diagnosis scenes, and the application range of the antenna diagnosis circuit is widened.

Description

Technical Field

[0001] This application belongs to the field of antenna diagnostic technology, and in particular relates to an antenna diagnostic circuit, an on-board antenna module, and a vehicle. Background Technology

[0002] Antenna diagnostic circuits are the foundation for determining antenna faults. They are widely used in electronic devices with communication capabilities, such as drones and automobiles.

[0003] However, the relevant antenna diagnostic circuits can only detect the presence of the antenna and use this as the result of antenna fault diagnosis. This not only results in inaccurate antenna fault diagnosis, but also cannot be applied to other fault diagnosis scenarios other than antenna presence detection. Utility Model Content

[0004] The purpose of this application is to provide an antenna diagnostic circuit, an on-board antenna module, and a vehicle, which can be applied to more antenna fault diagnosis scenarios and broaden the scope of application of the antenna diagnostic circuit.

[0005] A first aspect of this application provides an antenna diagnostic circuit, the antenna diagnostic circuit comprising:

[0006] The constant current source module is connected to the antenna and is used to provide power to the antenna.

[0007] The antenna detection module is connected to the constant current source module. The antenna detection module is used to sample the electrical signal of the constant current source module to obtain the first sampled electrical signal.

[0008] The control module is connected to the antenna detection module. The control module is used to determine the in-situ status and / or fault status of the antenna based on the first sampled electrical signal.

[0009] The antenna diagnostic circuit provided in this application utilizes a constant current source module to provide power to the antenna, and an antenna detection module samples the electrical signal of the constant current source module to obtain a first sampled electrical signal. Since the antenna can be considered as a load of the constant current source module, the first sampled electrical signal can be used to characterize the antenna's power consumption. Based on this, the control module can determine whether the antenna is in place and / or determine the antenna's fault state according to the first sampled electrical signal. The antenna diagnostic circuit provided in this application directly determines the antenna's fault state, making the fault detection results more accurate and applicable to antenna diagnostic schemes in more antenna fault diagnosis scenarios, thus broadening the scope of application of the antenna diagnostic circuit.

[0010] The second aspect of this application provides a vehicle-mounted antenna module, including the antenna diagnostic circuit, antenna, and global satellite system receiver provided in the first aspect above. The antenna diagnostic circuit is connected to the antenna, the antenna is connected to the global satellite system receiver, and the antenna diagnostic circuit is adapted to diagnose the in-situ status and / or fault status of the antenna.

[0011] A third aspect of this application provides a vehicle that includes the antenna diagnostic circuit provided in the first aspect, or the vehicle-mounted antenna module provided in the second aspect.

[0012] It is understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant descriptions in the first aspect above, and will not be repeated here. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an antenna diagnostic circuit provided in one embodiment of this application;

[0014] Figure 2 This is a schematic diagram of an antenna diagnostic circuit provided in another embodiment of this application;

[0015] Figure 3 A schematic diagram of an antenna diagnostic circuit provided in another embodiment of this application;

[0016] Figure 4 A schematic diagram of an antenna diagnostic circuit provided in another embodiment of this application;

[0017] Figure 5 A schematic diagram of an antenna diagnostic circuit is also provided in one embodiment of this application;

[0018] Figure 6 for Figure 4 A schematic diagram of the specific structure of an antenna diagnostic circuit is provided in the embodiment;

[0019] Figure 7 A schematic diagram of the specific structure of an antenna diagnostic circuit provided in one embodiment of this application.

[0020] Figure 8 for Figure 7 An embodiment provides a specific circuit diagram of an antenna diagnostic circuit;

[0021] Figure 9 This is a schematic diagram of the structure of a vehicle-mounted antenna module provided in one embodiment of this application;

[0022] Figure 10 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Antenna diagnostic circuits are the foundation for determining antenna faults. They are widely used in electronic devices with communication capabilities, such as drones and automobiles.

[0028] However, the relevant antenna diagnostic circuits can only detect the antenna's presence and use this as the basis for antenna fault diagnosis. This not only results in inaccurate fault determination but also makes them unsuitable for fault diagnosis scenarios beyond antenna presence detection. Therefore, the relevant antenna diagnostic solutions have a limited scope of application.

[0029] To address the aforementioned technical problems, this application provides an antenna diagnostic circuit that can be applied to more antenna fault diagnosis scenarios, thus broadening the scope of application of antenna diagnostic circuits.

[0030] See Figure 1 , Figure 1 A schematic diagram of an antenna diagnostic circuit according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0031] like Figure 1 As shown, an antenna diagnostic circuit 100 includes: a constant current source module 10, an antenna detection module 20, and a control module 30. Specifically:

[0032] A constant current source module 10 is connected to antenna 110. The constant current source module 10 provides power to antenna 110. An antenna detection module 20 is connected to constant current source module 10. The antenna detection module 20 samples the electrical signal from the constant current source module 10 to obtain a first sampled electrical signal. A control module 30 is connected to antenna detection module 20. The control module 30 determines the presence and / or fault status of antenna 110 based on the first sampled electrical signal.

[0033] In this embodiment, the constant current source module 10, connected to the antenna 110, can provide operating power to the antenna 110. Here, since the maximum output current of the constant current source module 10 is known or a fixed value, and the antenna 110 can be regarded as the load of the constant current source module 10, the antenna detection module 20 samples the electrical signal of the constant current source module 10, and the obtained first sampled electrical signal can be used to characterize the power consumption of the antenna 110 (as a load).

[0034] For example, since the constant current source module 10 serves as input, its output power or electrical signal magnitude depends on the load of the antenna 110. Therefore, when the antenna 110 is not in position, the first sampled electrical signal obtained by sampling the constant current source module 10 using the antenna detection module 20 approaches 0. When the voltage and / or current values ​​of the first sampled electrical signal obtained by sampling the constant current source module 10 using the antenna detection module 20 are greater than 0, it can be determined that the antenna 110 is in position. Furthermore, the fault state of the antenna can be determined based on the range of the voltage and / or current values ​​of the first sampled electrical signal. Fault states include short circuit, open circuit, signal reception failure, etc. For example, based on the range of the voltage and / or current values ​​of the first sampled electrical signal, it can be determined whether the antenna 110 is short-circuited, open-circuited, or whether it is operating normally.

[0035] Based on this, the control module 30 can determine whether the antenna 110 is in place and / or determine the fault state of the antenna 110 according to the first sampled electrical signal.

[0036] In a specific implementation, the constant current source module 10 can be implemented using a circuit that includes a DC constant current source. For example, the circuit including the DC constant current source can provide a corresponding operating current to the antenna 110 according to its operating state, and this operating current is equal to or less than the maximum current value that the DC constant current source circuit can output. Correspondingly, the antenna detection module 20 can be implemented using a current detection circuit.

[0037] For example, the antenna detection module 20 may include a sampling unit and a signal amplification unit. The sampling unit samples the output current of the circuit including the DC constant current source in the example above, and the signal amplification unit amplifies the sampled current value to obtain a sampled voltage value. Here, the sampled voltage value can be used as the first sampled electrical signal. Of course, in specific implementations, the sampled current value can also be used as the first sampled electrical signal; this is not a limitation.

[0038] In this example, the output of the amplification unit serves as the output of the antenna detection module 20 and is connected to the data sampling terminal of the control module 30. Specifically, the control module 30 may include a processing chip. The data sampling terminal of this processing chip (such as the sampling terminal of an analog-to-digital converter (ADC)) can be connected to the output of the antenna detection module 20 to obtain a first sampled electrical signal. By comparing this first sampled electrical signal with a preset reference voltage or reference current, the processing chip can determine whether the antenna 110 is in place and / or determine the fault state of the antenna 110.

[0039] In the above scheme, the antenna diagnostic circuit 100 is connected to the antenna 110. The antenna diagnostic circuit 100 includes a constant current source module 10, an antenna detection module 20, and a control module 30. By connecting the constant current source module 10 to the antenna 110, the constant current source module 10 can provide power to the antenna. Therefore, for the constant current source module 10, the antenna 110 can be considered as its load. Thus, by connecting the constant current source module 10, the antenna detection module 20, and the control module 30 sequentially, the antenna detection module 20 can sample the electrical signal of the constant current source module 10, and the sampled first electrical signal can be sent to the control module 30. Since this first electrical signal can be used to characterize the power consumption of the antenna 110, the control module 30 can determine whether the antenna 110 is in place and / or determine the antenna's fault state based on this first electrical signal. Therefore, an antenna diagnostic scheme applicable to more antenna fault diagnosis scenarios is provided, broadening the applicability of the antenna diagnostic circuit.

[0040] Figure 2 A schematic diagram of an antenna diagnostic circuit according to another embodiment of this application is shown. As an embodiment, it is related to... Figure 1 The difference in the illustrated embodiment is that, Figure 2 In the embodiment shown, the antenna diagnostic circuit 100 further includes a protection module 40.

[0041] like Figure 2 As shown, the protection module 40 is connected between the antenna 110 and the constant current source module 10. The protection module 40 is used to shield against electrostatic interference and prevent high voltage backflow.

[0042] It is easy to understand that, since the antenna 110 can be used to transmit and receive radio frequency signals in actual use, it is prone to electrostatic interference or surge interference with conductors in the surrounding environment (such as the casing of electronic devices). In this embodiment, in order to shield against this interference and prevent surge high voltage backflow, a protection module 40 is connected between the antenna 110 and the constant current source module 10.

[0043] In practical implementation, the protection module 40 can be implemented using existing unidirectional conduction circuits. For example, a circuit can be constructed using the unidirectional conduction characteristics of a diode. Here, since the antenna 110 acts as a radiator in the communication process, it needs to be isolated from the constant current source module 10. Therefore, an inductor can be added to the diode for isolation.

[0044] It is easy to understand that in the specific implementation process, the signal frequency band that needs to be isolated and the voltage value of the reverse high voltage can be determined according to the usage scenario of antenna 110, and the specific specifications of diodes and inductors can be determined accordingly, so it will not be elaborated here.

[0045] In the above scheme, a protection module 40 is connected between the antenna 110 and the constant current source module 10. The protection module 40 can not only isolate the antenna 110 as a radiator from the constant current source module 10 for communication, but also shield electrostatic interference and prevent high voltage backflow, thereby improving the stability of the antenna 110 in actual use.

[0046] Figure 3 A schematic diagram of an antenna diagnostic circuit according to another embodiment of this application is shown. As an embodiment, it is related to... Figure 2 The difference in the illustrated embodiment is that, Figure 3 In the illustrated embodiment, the antenna diagnostic circuit 100 further includes a power supply module 50, connected to the constant current source module 10. The power supply module 50 is used to provide power to the constant current source module 10.

[0047] In this embodiment, the power supply module 50 provides electrical energy to the constant current source module 10. Specifically, the power supply module 50 can be connected to a power source and perform voltage transformation on the voltage provided by the power source, and output the transformed voltage to the constant current source module 10.

[0048] In practice, the power supply module 50 may include a voltage conversion unit or a voltage conversion chip, which boosts or bucks the voltage of the power supply to obtain a voltage suitable for the constant current source module 10, so that the constant current source module 10 can operate according to the voltage and thus provide power to the antenna 110.

[0049] The above solution connects the power supply module 50 to the constant current source module 10, allowing the power supply module 50 to act as a buffer between the constant current source module 10 and the power supply. This power supply module 50 can store and / or transform the electrical energy provided by the power supply before supplying power to the constant current source module 10, avoiding excessive current and / or voltage in the constant current source module 10 due to direct connection to the power supply, thus improving the overall stability of the antenna diagnostic circuit 100.

[0050] Figure 4 This illustration shows a schematic diagram of an antenna diagnostic circuit according to another embodiment of this application. As an embodiment, it is related to... Figure 3 The difference in the illustrated embodiment is that, Figure 4 In the embodiment shown, the antenna diagnostic circuit 100 further includes a power control module 60.

[0051] exist Figure 4 In this configuration, the power control module 60 is connected between the output terminal of the constant current source module 10 and the enable terminal 51 of the power supply module 50.

[0052] In this embodiment, the power control module 60 is used to sample the output of the constant current source module 10 to obtain a second sampled electrical signal, and to change or not change the voltage of the enable terminal 51 of the power supply module 50 according to the second sampled electrical signal.

[0053] It is easy to understand that, similar to the first sampled electrical signal, since the second sampled electrical signal is obtained by the power control module 60 sampling the output terminal of the constant current source module 10, the second sampled electrical signal can be used to characterize at least one of the output power, output voltage, and output current of the constant current source module 10. That is, the second sampled electrical signal can at least be used to characterize whether the antenna 110 is short-circuited to ground.

[0054] Based on this, when the power control module 60 determines that the antenna 110 is short-circuited to ground according to the second sampling electrical signal, it can change the voltage of the enable terminal 51 of the power supply module 50 to stop the power supply module 50 from providing power to the constant current source module 10, thereby stopping the power supply to the antenna 110. Alternatively, when the power control module 60 determines that the antenna 110 is not short-circuited according to the second sampling point number, it can maintain the voltage of the enable terminal 51 of the power supply module 50, allowing the power supply module 50 to continue providing power to the constant current source module 10, so that the constant current source module 10 can continue to provide power to the antenna 110.

[0055] In a practical implementation, the power control module 60 can be implemented using a switching circuit composed of a switching transistor and / or an electronic switch.

[0056] For example, the switching circuit in the power control module 60 is connected between the output terminal of the constant current source module 10 and the enable terminal 51 of the power supply module 50. This switching circuit samples the electrical signal at the output terminal of the constant current source module 10. Here, it is assumed that the voltage at the enable terminal 51 of the power supply module 50 is high by default. When the antenna 110 is short-circuited to ground, the output voltage of the constant current source module 10 is higher; when the antenna 110 is not short-circuited to ground, the output voltage of the constant current source module 10 is lower.

[0057] As an example, the power control module 60 can sample the electrical signal at the output terminal of the constant current source module 10. When the sampled second electrical signal is a higher voltage, the higher voltage will activate the circuit between the enable terminal 51 of the power supply module 50 and ground, thereby lowering the voltage of the enable terminal 51 of the power supply module 50. That is, the voltage of the enable terminal 51 of the power supply module 50 will be changed. As a result, the power supply module 50 will stop providing power to the constant current source module 10, and the constant current source module 10 will also stop providing power to the antenna 110.

[0058] As another example, the power control module 60 can sample the electrical signal at the output terminal of the constant current source module 10. When the sampled second electrical signal is a low voltage, the loop between the enable terminal 51 of the power supply module 50 and ground is not connected under the action of this low voltage, thereby maintaining the voltage of the enable terminal 51 of the power supply module 50. Thus, the power supply module 50 can continuously provide power to the constant current source module 10, and the constant current source module 10 can continuously provide power to the antenna 110.

[0059] The above solution allows the power control module 60 to determine whether the antenna 110 is short-circuited to ground. Based on this determination, the voltage at the enable terminal 51 of the power supply module 50 can be adjusted, allowing the power supply module 50 to either stop or continue supplying power to the constant current source module 10. This achieves the goal of stopping power supply to the antenna 110 via the constant current source module 10 when the antenna 110 is short-circuited to ground, and continuously supplying power to the antenna 110 via the constant current source module 10 when the antenna 110 is not short-circuited to ground, thus improving the rationality of the antenna diagnostic circuit 100.

[0060] Figure 5 A schematic diagram of an antenna diagnostic circuit according to another embodiment of this application is shown. As an embodiment, it is related to... Figure 3 The difference in the illustrated embodiment is that, Figure 5 In the illustrated embodiment, the control module 30 is also connected to the enable terminal 51 of the power supply module 50. The control module 30 is also used to change the voltage of the enable terminal 51 of the power supply module 50 when the antenna 110 is in a short-circuit fault state.

[0061] In this embodiment, the control module 30 can determine whether the antenna 110 is in place and / or in a fault state based on the first sampled electrical signal. In specific implementation, the control module 30 can be configured with a circuit consisting of corresponding comparators, using the first sampled electrical signal input to the comparator circuit for comparison. For example, when the voltage of the first sampled electrical signal is equal to or greater than a preset short-circuit threshold, the fault state of the antenna 110 can be determined to be a short circuit. At this time, the control module 30 can change the voltage of the enable terminal 51 of the power supply module 50, causing the power supply module 50 to stop providing power to the constant current source module 10, and the constant current source module 10 to also stop providing power to the antenna 110.

[0062] The above scheme, by using the multiplexing control module 30 to determine the presence and / or fault status of the antenna 110 based on the first sampled electrical signal, and controlling the power supply module 50 to supply power to the constant current source module 10 based on the determination result, can not only save the implementation cost of the antenna diagnostic circuit 100 and reduce the circuit area, but also improve the utilization rate of the control module 30.

[0063] Figure 6 It shows Figure 4 The embodiment provides a schematic diagram of the specific structure of an antenna diagnostic circuit. As an example, the constant current source module 10 includes a constant current branch 11.

[0064] like Figure 6 As shown, the output terminal 112 of the constant current branch 11 is connected to the protection module 40, and the input terminal 111 of the constant current branch 11 is connected to the power supply module 50.

[0065] In this embodiment, the constant current branch 11 is used to transmit the electrical energy provided by the power supply module 50 to the antenna 110 through the protection module 40. Therefore, the protection module 40 can isolate the antenna 110 from the constant current branch 11, and at the same time prevent high voltage from flowing back to the power supply module 50 through the constant current branch 11.

[0066] like Figure 6 As shown in the figure, as an embodiment, the antenna detection module 20 includes: a first input resistor Rin1, a second input resistor Rin2, and an operational amplifier branch 21.

[0067] The first end of the first input resistor Rin1 and the first end of the second input resistor Rin2 are respectively connected to the constant current branch 11. The second end of the first input resistor Rin1 is connected to the first input terminal of the operational amplifier branch 21. The second end of the second input resistor Rin2 is connected to the second input terminal of the operational amplifier branch 21. The output terminal of the operational amplifier branch 21 is connected to the control module 30.

[0068] In this embodiment, the antenna detection module 20 is connected to the constant current branch 11 through the first input resistor Rin1 and the second input resistor Rin2, which allows it to sample the input electrical signal of the constant current branch 11 and obtain a first sampled electrical signal. The first sampled electrical signal is then amplified by the operational amplifier branch 21 to obtain an electrical signal suitable for processing by the control module 30.

[0069] For example, the antenna detection module 20 is connected to the constant current branch 11 through the first input resistor Rin1 and the second input resistor Rin2, and can sample the input electrical signal of the constant current branch 11. Specifically, it can sample the input current of the constant current branch 11, and amplify the current using the operational amplifier branch 21 to obtain the corresponding input voltage value. This voltage value is then transmitted to the control module 30. The control module 30 can determine the presence and / or fault status of the antenna 110 based on this voltage value.

[0070] like Figure 6 As shown, in this embodiment, the power control module 60 includes a level matching branch 61. The input terminal of the level matching branch 61 is connected to the output terminal of the constant current source module 10, and the output terminal of the level matching branch 61 is connected to the enable terminal 51 of the power supply module 50.

[0071] It is understandable that the constant current source module 10 includes a constant current branch 11, and the output terminal 112 of the constant current branch 11 can be used as the output terminal of the constant current source module 10.

[0072] In the above scheme, the protection module 40 can isolate the antenna 110 from the constant current branch 11, and at the same time prevent high voltage from flowing back to the power supply module 50 through the constant current branch 11. By sampling the input electrical signal of the constant current branch 11 using the first input resistor Rin1 and the second input resistor Rin2, a first sampled electrical signal can be obtained. This first sampled electrical signal is then amplified by the operational amplifier branch 21 to obtain an electrical signal suitable for processing by the control module 30, which helps to improve the data processing efficiency of the control module 30.

[0073] Figure 7 A schematic diagram of a specific structure of an antenna diagnostic circuit according to one embodiment is shown. In conjunction with any of the above embodiments, in... Figure 7 In the illustrated embodiment, the antenna diagnostic circuit 100 may further include a filtering module 70. The filtering module 70 is connected to the constant current source module 10 via the protection module 40. The filtering module 70 is used to filter the power supplied by the constant current source module 10 to the antenna 110.

[0074] It is easy to understand that since the constant current source module 10 can provide power to the antenna 110 through the protection module 40, the filter module 70 is connected through the branch node that transmits power in the protection module 40, and can filter the power provided by the constant current source module 10, thereby reducing the probability of interference when the antenna 110 transmits and receives radio frequency signals.

[0075] Figure 8 It shows Figure 7 An embodiment provides a specific circuit diagram of an antenna diagnostic circuit. For example... Figure 8 As shown in the figure, as an embodiment, the constant current branch 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a first switch Q1, a second switch Q2, and a first capacitor C1.

[0076] The first end of the first resistor R1 is connected to the first end of the second resistor R2, forming node P1, which serves as the input terminal 111 of the constant current branch 11. The second end of the first resistor R1, the controlled terminal of the first switch Q1, and the first potential terminal of the second switch Q2 are all connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is grounded. The second end of the second resistor R2 is connected to the first potential terminal of the first switch Q1. The second potential terminal of the first switch Q1 and the first end of the third resistor R3 are all connected to the controlled terminal of the second switch Q2. The second end of the third resistor R3 is grounded. The second potential terminal of the second switch Q2 serves as the output terminal 112 of the constant current branch 11.

[0077] Combination Figure 7 and Figure 8 The constant current branch 11 supplies power to the antenna 110 through the protection module 40. In a specific implementation, the protection module 40 can be connected to the antenna connector J1, and then the antenna interface (ANT) can be connected through the antenna connector J1.

[0078] like Figure 8 As shown, in a specific implementation, the first switch Q1 and the second switch Q2 can be plug-and-play (PNP) type transistors. It is understood that in other embodiments, the first switch Q1 and the second switch Q2 can also be replaced by other metal-oxide-semiconductor field-effect transistors (MOSFETs) or insulated-gate bipolar transistors (IGBTs), which will not be elaborated upon here.

[0079] exist Figure 8In the circuit, after the power supply module 50 is powered on normally, the Vbe of the first switch Q1 is greater than 0, and the first switch Q1 is in the off state. At this time, the Vbe of the second switch Q2 is less than 0, and the second switch Q2 is turned on. The power supply module 50 supplies power to the antenna ANT through the first resistor R1, the second switch Q2, and the protection module 40. When the load current of the antenna ANT increases, the voltage difference across the first resistor R1 gradually increases, so the Vbe of the first switch Q1 gradually decreases. The first switch Q1 is in the amplification region, and the current in the third resistor R3 gradually increases. At this time, the Vbe of the second switch Q2 gradually increases, and the second switch Q2 shrinks from the saturation region to the amplification region, so the conduction current of the second switch Q2 decreases. When the load current of the antenna ANT increases to a certain current threshold (e.g., 80mA), the partial conduction of the first switch Q1 affects the conduction of the second switch Q2, thereby limiting the conduction current of the second switch Q2 to the current threshold (e.g., 80mA), thus acting as a constant current source circuit.

[0080] Combination Figure 7 and Figure 8 As an example, the protection module 40 includes an inductor L, a first diode D1, and a second diode D2. The first end of the inductor L and the first end of the first diode D1 are respectively connected to the antenna 110 through the antenna connector J1. The second end of the first diode D1 is grounded. The second end of the inductor L is connected to the first end of the second diode D2. The second end of the second diode D2 is connected to the output terminal 112 of the constant current branch 11.

[0081] like Figure 8 As shown in the illustration, in one embodiment, the first diode D1 is a transient voltage suppressor diode. Here, the first diode D1 is a transient voltage suppressor diode with bidirectional voltage regulation and bidirectional negative resistance characteristics, providing overvoltage protection. It can be used to suppress instantaneous overvoltages. When a surge pulse voltage occurs instantaneously in the protected circuit, the bidirectional breakdown diode can quickly Zener break down, changing from a high-resistance state to a low-resistance state, thus shunting and clamping the surge voltage, thereby protecting the components in the circuit from damage by the instantaneous surge pulse voltage. The first terminal of the second diode D2 is the cathode, and the second terminal of the second diode D2 is the anode.

[0082] It is easy to understand that since the constant current branch 11 supplies power to the antenna 110 through the protection module 40, a corresponding filtering module can be configured in the protection module 40 to filter the power supplied by the constant current branch 11, thereby reducing the probability of interference when the antenna 110 transmits and receives radio frequency signals. Figure 8 In a specific implementation, the filtering module can be a filtering circuit composed of a fifth capacitor C5 and a sixth capacitor C6 connected in parallel.

[0083] like Figure 8As shown in the illustration, as an embodiment, the operational amplifier branch 21 includes at least an operational amplifier U1, a second capacitor C2, a third capacitor C3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The positive input terminal +IN of the operational amplifier U1 serves as the first input terminal of the operational amplifier branch 21, and the negative input terminal -IN of the operational amplifier U1 serves as the second input terminal of the operational amplifier branch 21. The power supply terminal of the operational amplifier U1 and the first terminal of the second capacitor C2 are connected to a preset power supply VDD, and the second terminal of the second capacitor C2 is grounded. The first terminal of the fourth resistor R4 is connected to the positive input terminal of the operational amplifier U1, and the second terminal of the fourth resistor R4 is grounded. The first terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6 are connected to the output terminal OUT of the operational amplifier U1, and the second terminal of the fifth resistor R5 is connected to the negative input terminal -IN of the operational amplifier U1. The second terminal of the sixth resistor R6 is connected to the first terminal of the third capacitor C3, and the node formed serves as the output terminal of the operational amplifier branch 21. The second terminal of the third capacitor C3 is grounded.

[0084] exist Figure 8 In this module, the control module 30 may include a microcontroller unit (MCU) and is connected to the output of the operational amplifier branch 21 in the antenna detection module 20 via the data channel ADC.

[0085] Taking a circuit where the fourth resistor R4 and the fifth resistor R5 are both 47KΩ, and the first input resistor Rin1 and the second input resistor Rin2 are 10KΩ resistors matched to op-amp branch 21 as an example. In this example, the sixth resistor R6 can be 100Ω and the third capacitor C3 can be 10pF, together forming a low-pass filter input to the MCU's ADC sampling channel. The second capacitor C2 is used for filtering by operational amplifier U1. Op-amp branch 21 is a negative feedback amplifier circuit with a gain β = 47K / 10K = 4.7.

[0086] The principle of antenna fault detection is as follows:

[0087] (1) During normal operation: The second switch Q2 is normally turned on to supply power to the antenna ANT. When the antenna ANT is working normally, the current is in the range of 15~30mA. The voltage output of the operational amplifier U1 is (0.015~0.03)*10*4.7=(0.7~1.41). The ADC channel of the processor MCU receives the voltage output of the operational amplifier U1. When the processor MCU detects that the voltage is between 0.7 and 1.41V, it considers the antenna to be in place.

[0088] (2) When the antenna is short-circuited to ground: Constant current branch 11 can achieve current limiting protection. Calculated at 80mA, the output voltage = 0.08 * 10 * 4.7 = 3.76V. Operational amplifier U1 can cut off this signal to 3.3V, and output this 3.3V to the ADC pin of the processor MCU. The MCU determines that there is a short circuit fault at the antenna port. Here, the insulation layer of the antenna harness is damaged, and it comes into contact with the power cable or ground wire, thus forming a short circuit to ground.

[0089] (3) When the antenna is open-circuited: The antenna detection module 20 detects that there is no voltage on the first input resistor R1 through the first input resistor Rin1 and the second input resistor Rin2, and the operational amplifier U1 outputs 0V. At this time, the ADC of the processor MCU collects the data and determines that the antenna is open-circuited. Here, an open-circuit fault refers to the antenna being disconnected or loose.

[0090] (4) When the antenna is short-circuited to the power supply: the second diode D2 of the antenna protection module 40 is reverse cut off, which can protect the circuit.

[0091] like Figure 8 As shown in the figure, in one embodiment, the level matching branch 61 includes: a third switch Q3, a fourth switch Q4, a third diode D3, a fourth capacitor C4, a seventh resistor R7, and an eighth resistor R8. The controlled terminal of the third switch Q3 serves as the input terminal of the level matching branch 61. The first potential terminal of the third switch Q3 is grounded. The second potential terminal of the third switch Q3, the first terminal of the seventh resistor R7, and the first terminal of the fourth capacitor C4 are all connected to the controlled terminal of the fourth switch Q4. The second terminal of the seventh resistor R7 is connected to a preset power supply VDD. The second terminal of the fourth capacitor C4 and the first potential terminal of the fourth switch Q4 are all grounded. The second potential terminal of the fourth switch Q4 and the first terminal of the eighth resistor R8 are all connected to the cathode of the third diode D3. The second terminal of the eighth resistor R8 is connected to the preset power supply VDD. The anode terminal of the third diode D3 serves as the output terminal of the level matching branch 61.

[0092] like Figure 8 As shown, the controlled terminal of the third switch Q3 serves as the input terminal of the level matching branch 61 and is connected to the output terminal 112 of the constant current branch 11. The anode terminal of the third diode D3 serves as the output terminal of the level matching branch 61 and is connected to the enable terminal 51 of the power supply module 50.

[0093] exist Figure 8 It should be noted that, since there is a certain voltage difference between the output voltage of the constant current branch 11's output terminal 112 and the voltage of the enable terminal 51 of the power supply module 50, a level matching branch 61 needs to be connected. In the level matching branch 61, the third switch Q3 and the fourth switch Q4 are mainly used to achieve consistent voltage polarity in two stages of inversion.

[0094] like Figure 8 As shown, the output terminal 112 of the constant current branch 11 serves as both the second sampling electrical signal and the antenna status feedback signal, which is connected to the controlled terminal of the third switch Q3. Taking the power supply module 50 as including the power supply chip U2, and taking the enable pin EN of the power supply chip U2 as the default pull-up enable of the enable terminal 51 of the power supply module 50 as an example, when the antenna is short-circuited to ground, the second sampling electrical signal obtained by the level matching branch 61 sampling the output terminal 112 of the constant current branch 11 is a higher voltage. This turns on the third switch Q3 and the fourth switch Q4, thereby pulling down the voltage of the enable pin EN of the power supply chip U2.

[0095] exist Figure 8 In this embodiment, the processor MCU of the control module 30 can also be configured with another general-purpose input / output (GPIO) pin. In one embodiment, this GPIO pin can be connected to the enable pin EN of the power supply chip U2. When the MCU determines that the antenna is short-circuited to ground based on the first sampled electrical signal, it can pull down the voltage of the enable pin EN of the power supply chip U2 through this GPIO pin, thereby stopping the power supply to the antenna.

[0096] In some embodiments, when the MCU determines that the antenna short-circuit fault to ground has been cleared based on the first sampled electrical signal, it can also pull up the voltage of the enable pin EN of the power supply chip U2 through the GPIO pin, thereby restoring power supply to the antenna.

[0097] The above solution can realize full-scenario diagnosis of antenna in-situ detection, open circuit faults and short circuit faults. In addition, when an antenna short circuit to ground occurs, it can automatically restore power supply to the antenna after the fault is cleared, which can improve the overall reliability of the antenna.

[0098] Figure 9 A schematic diagram of the structure of a vehicle-mounted antenna module provided in an embodiment of this application is shown. Figure 9 As shown, the vehicle-mounted antenna module 200 includes the antenna diagnostic circuit 100, antenna 110, and global satellite system receiver 120 provided in the above embodiments. The antenna diagnostic circuit 100 is connected to the antenna 110, and the antenna 110 is connected to the global satellite system receiver 120. The antenna diagnostic circuit 100 is adapted to diagnose the in-situ status and / or fault status of the antenna 110.

[0099] In practice, antenna 110 can be any type of vehicle-mounted antenna; there are no restrictions here.

[0100] For example, antenna 110 can be an antenna for communicating with a terminal, an antenna for communicating with vehicles and / or roadside equipment, etc. Accordingly, global satellite system receiver 120 transmits and receives wireless signals by reusing this vehicle-mounted antenna.

[0101] For example, antenna 110 can also be an antenna for a global satellite system installed on the vehicle. Global satellite system receiver 120 can achieve satellite positioning and navigation functions by connecting to antenna 110.

[0102] The solution in this embodiment diagnoses the in-situ status and / or fault status of the antenna 110 through the antenna diagnostic circuit 110, which can obtain more accurate fault detection results and is applicable to more fault diagnosis scenarios of vehicle antenna modules.

[0103] Figure 10 A schematic diagram of the structure of a vehicle provided in an embodiment of this application is shown. Figure 10 As shown, the vehicle 300 includes the vehicle-mounted antenna module 200 provided in the above embodiments.

[0104] It can be understood that the improvements and specific implementation methods of the vehicle-mounted antenna module 200 and the vehicle 300 provided in this embodiment, which are related to this application, have all been... Figures 1 to 8 For a detailed description of the corresponding antenna diagnostic circuit 100 embodiment, please refer to the detailed description. Figures 1 to 8 ,as well as Figures 1 to 8 The relevant descriptions in the corresponding embodiments will not be repeated here.

[0105] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0106] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An antenna diagnostic circuit, characterized in that, The antenna diagnostic circuit includes: A constant current source module, connected to the antenna, is used to provide power to the antenna; An antenna detection module is connected to the constant current source module. The antenna detection module is used to sample the electrical signal of the constant current source module to obtain a first sampled electrical signal. A control module, connected to the antenna detection module, is used to determine the in-situ status and / or fault status of the antenna based on the first sampled electrical signal.

2. The antenna diagnostic circuit according to claim 1, characterized in that, The antenna diagnostic circuit also includes: A protection module is connected between the antenna and the constant current source module. The protection module is used to shield electrostatic interference and prevent high voltage backflow.

3. The antenna diagnostic circuit according to claim 2, characterized in that, The antenna diagnostic circuit also includes: A power supply module is connected to the constant current source module and is used to provide power to the constant current source module.

4. The antenna diagnostic circuit according to claim 3, characterized in that, The antenna diagnostic circuit also includes: A power control module is connected between the output terminal of the constant current source module and the enable terminal of the power supply module. The power control module is used to sample the electrical signal at the output terminal of the constant current source module to obtain a second sampled electrical signal, and to change or not change the voltage at the enable terminal of the power supply module according to the second sampled electrical signal.

5. The antenna diagnostic circuit according to claim 3, characterized in that, The control module is also connected to the enable terminal of the power supply module, and the control module is also used to change the voltage of the enable terminal of the power supply module when the fault state of the antenna is short circuit.

6. The antenna diagnostic circuit according to claim 2, characterized in that, The antenna diagnostic circuit also includes: A filtering module is provided, which is connected to the constant current source module through the protection module. The filtering module is used to filter the power supplied by the constant current source module to the antenna.

7. The antenna diagnostic circuit according to claim 3, characterized in that, The constant current source module includes: a constant current branch; The output terminal of the constant current branch is connected to the protection module, and the input terminal of the constant current branch is connected to the power supply module. The constant current branch is used to transmit the electrical energy provided by the power supply module to the antenna through the protection module.

8. The antenna diagnostic circuit according to claim 7, characterized in that, The antenna detection module includes: a first input resistor, a second input resistor, and an operational amplifier branch; The first end of the first input resistor and the first end of the second input resistor are respectively connected to the constant current branch. The second end of the first input resistor is connected to the first input terminal of the operational amplifier branch. The second end of the second input resistor is connected to the second input terminal of the operational amplifier branch. The output terminal of the operational amplifier branch is connected to the control module.

9. The antenna diagnostic circuit according to claim 7, characterized in that, The protection module includes: an inductor, a first diode, and a second diode; The first end of the inductor and the first end of the first diode are respectively connected to the antenna through an antenna connector. The second end of the first diode is grounded. The second end of the inductor is connected to the first end of the second diode. The second end of the second diode is connected to the output end of the constant current branch.

10. The antenna diagnostic circuit according to claim 4, characterized in that, The power control module includes: a level matching branch; The input terminal of the level matching branch is connected to the output terminal of the constant current source module, and the output terminal of the level matching branch is connected to the enable terminal of the power supply module.

11. A vehicle-mounted antenna module, characterized in that, Includes the antenna diagnostic circuit, antenna, and global satellite system receiver as described in any one of claims 1 to 10. The antenna diagnostic circuit is connected to the antenna, and the antenna is connected to the global satellite system receiver. The antenna diagnostic circuit is adapted to diagnose the in-situ status and / or fault status of the antenna.

12. A vehicle, characterized in that, It includes the antenna diagnostic circuit according to any one of claims 1 to 10, or the vehicle-mounted antenna module according to claim 11.

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