Antenna powering circuit and vehicle

Abstract

The application discloses an antenna power supply circuit and a vehicle, and belongs to the technical field of antennas. In the application, a power supply branch of a mirror current source module is used to supply power to an antenna module, and a detection branch of the mirror current source module is used to detect the power supply current of the power supply branch in a mirror mode and output a current detection signal, so that a processing module can detect the state of the antenna according to the current detection signal. In this way, the mirror current source module composed of a small number of discrete devices is used to simultaneously realize the functions of antenna power supply and power supply current detection, and an LDO and an operational amplifier chip need not be arranged, so that the cost of the antenna power supply circuit can be reduced.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to an antenna power supply circuit and a vehicle. Background Technology

[0002] In related technologies, LDOs (Low Dropout Regulators) can be used to power vehicle-mounted active antennas, and detection circuits composed of operational amplifier chips and other devices can be used to detect the antenna's supply current in order to diagnose the antenna's status. However, the high cost of LDOs and operational amplifier chips makes the cost of vehicle-mounted antenna power supply circuits high. Summary of the Invention

[0003] This application provides an antenna power supply circuit and a vehicle, reducing the cost of vehicle-mounted antenna power supply circuits, thereby at least partially solving the aforementioned technical problems.

[0004] To achieve the above objectives, in a first aspect, an antenna power supply circuit is provided, comprising: The mirror current source module includes a power input terminal, a power supply branch, a detection branch, and a signal output terminal; The power input terminal is used to connect to the power supply. The power supply branch is connected to the power input terminal and the antenna port respectively. In response to the power supply power-on state, it switches its working state to the on state to supply power to the antenna module connected to the antenna port. The detection branch is connected to the power supply branch, the power input terminal, and the signal output terminal respectively, and is used to detect the power supply current of the power supply branch and output the corresponding current detection signal to the signal output terminal. The processing module, connected to the signal output terminal, is used to determine the antenna status of the antenna module based on the current detection signal.

[0005] Secondly, a vehicle is also provided, comprising: Antenna power supply circuit as described above.

[0006] In summary, in this application, the antenna is powered by the power supply branch of the mirror current source module, and the power supply current of the power supply branch is detected in a mirror manner through the detection branch of the mirror current source module, and a current detection signal is output. This allows the processing module to detect the antenna status based on the current detection signal. Thus, by using a mirror current source module composed of a few discrete components, both antenna power supply and power supply current detection functions are achieved, eliminating the need for LDO and operational amplifier chips, thereby reducing the cost of the antenna power supply circuit. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the first structure of the antenna power supply circuit provided in some embodiments of this application; Figure 2 This is a schematic diagram of a second structure of the antenna power supply circuit provided in some embodiments of this application; Figure 3 This is a schematic diagram of a third structure of the antenna power supply circuit provided in some embodiments of this application; Figure 4 This is a schematic diagram of the fourth structure of the antenna power supply circuit provided in some embodiments of this application; Figure 5 This is a first circuit schematic diagram of an antenna power supply circuit provided in some embodiments of this application; Figure 6 This is a second circuit schematic diagram of the antenna power supply circuit provided in some embodiments of this application; Figure 7 This is a first circuit schematic diagram of the overcurrent detection module, current limiting module, and mirror current source module provided in some embodiments of this application; Figure 8 This is a second circuit schematic diagram of the overcurrent detection module, current limiting module, and mirror current source module provided in some embodiments of this application; Figure 9 This is a third circuit schematic diagram of the overcurrent detection module, current limiting module, and mirror current source module provided in some embodiments of this application; Figure 10 for Figure 5 and Figure 6 Simulation curves of the corresponding antenna power supply circuit; Figure 11 for Figure 7 Simulation curves of the corresponding antenna power supply circuit; Figure 12 for Figure 8 Simulation curves of the corresponding antenna power supply circuit; Figure 13 for Figure 9 The simulation curve of the corresponding antenna power supply circuit.

[0009] Explanation of reference numerals in the attached figures: 100. Mirror current source module; 101. Power input terminal; 102. Power supply branch; 103. Detection branch; 104. Signal output terminal; P. Common contact; 200. Processing module; 300. Current limiting module; 400. Power supply control module; 401. First unidirectional conduction unit; 402. Second unidirectional conduction unit; 403. Control unit; 500. Switch module; 600. Overcurrent detection module; 700. Signal conditioning module; 800. Protection module; Q1, First switching device; Q2, Second switching device; Q3, Third switching device; Q4, the fourth switching device; Q5, the fifth switching device; Q6, the sixth switching device; Q7, the seventh switching device; Q8, the eighth switching device; Q9, the ninth switching device; R1, the first resistor; R2, the second resistor; R3, the third resistor; R4, the fourth resistor; R5, the fifth resistor; R6, the sixth resistor; R7, the seventh resistor; R8, the eighth resistor; R9, the ninth resistor; R10, the tenth resistor; R11, the eleventh resistor; R12, the twelfth resistor; R13, the pull-up resistor; R14, the pull-down resistor; R15, time delay resistor; R16, first conditioning resistor; R17, second conditioning resistor; R18, the eighteenth resistor; R19, the nineteenth resistor; D1, the first diode; D2, second diode; D3, third diode; D4, TVS diode; L1, inductor; C1, Delay capacitor; C2, Conditioning capacitor; C3, First filter capacitor; C4, the second filter capacitor; C5, the fifth capacitor.

[0010] The realization of the objectives, functional features and advantages of the embodiments of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0011] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0012] In a first aspect, embodiments of this application provide an antenna power supply circuit, such as... Figure 1As shown, it may include a mirror current source module 100 and a processing module 200. The mirror current source module 100 may include a power input terminal 101, a power supply branch 102, a detection branch 103 and a signal output terminal 104.

[0013] The power input terminal 101 is connected to the power supply P5V0. The power supply branch 102 is connected to both the power input terminal 101 and the antenna port RF_IN_ANT. In response to the power-on state of the power supply P5V0, it switches its operating state to the ON state, supplying power to the antenna module connected to the antenna port RF_IN_ANT. The detection branch 103 is connected to the power supply branch 102, the power input terminal 101, and the signal output terminal 104. It detects the supply current of the power supply branch 102 and outputs a corresponding current detection signal to the signal output terminal 104. The processing module 200 is connected to the signal output terminal 104 and determines the antenna state of the antenna module based on the current detection signal.

[0014] It should be noted that the antenna power supply circuit can be used for the vehicle-mounted antenna module. In the vehicle-mounted antenna module, the GNSS (Global Navigation Satellite System Antenna), 5G antenna, and FM (Frequency Modulation) antenna are active antennas, typically powered via the antenna port RF_IN_ANT using a POC (Power Over Coax) method. The power supply P5V0 refers to the +5V DC power supply that provides POC power to the antenna port RF_IN_ANT. This 5V power supply can be obtained by multiplexing an existing 5V power rail in the vehicle control system.

[0015] In this embodiment, when the power supply P5V0 is powered on, the power supply branch 102 of the mirror current source module 100 is turned on, connecting the power supply P5V0 to the antenna port RF_IN_ANT to power the antenna module; when the power supply P5V0 is not powered on, the power supply branch 102 is turned off, disconnecting the line between the power supply P5V0 and the antenna port RF_IN_ANT to stop powering the antenna module. Simultaneously, the detection branch 103 and the power supply branch 102 form a mirror current source structure: when the power supply branch 102 is turned on, the detection branch 103 is also turned on; when the power supply branch 102 is turned off, the detection branch 103 is also turned off; and the detection current of the detection branch 103 is in a fixed proportional relationship with the power supply current of the power supply branch 102, so that the current detection signal output by the signal output terminal 104 can reflect the magnitude of the power supply current of the power supply branch 102, enabling the processing module 200 to realize antenna status detection of the antenna module. The processing module 200 can be at least one of the vehicle's electronic control units or an MCU (Microcontroller Unit). The processing module 200 can acquire current detection signals through an ADC (Analog-to-Digital Converter) port. Therefore, in this embodiment, the antenna module is powered by the power supply branch of the mirror current source module, and the power supply current of the power supply branch is detected in a mirror manner through the detection branch of the mirror current source module, and a current detection signal is output. This allows the processing module to perform antenna status detection based on the current detection signal. Thus, by using a mirror current source module composed of a few discrete components, both antenna power supply and power supply current detection functions are achieved, eliminating the need for LDO and operational amplifier chips, thereby reducing the cost of the antenna power supply circuit.

[0016] Furthermore, it is understandable that when the processing module 200 performs antenna status detection, it does not need to accurately measure the supply current value. It only needs to determine the range of the supply current to determine the antenna status. That is, the processing module 200 can detect the antenna status by judging whether the current detection signal is within a preset range. The antenna status can include open circuit (not connected), short circuit, and normal operation. For example, if the antenna's operating current range is 4mA to 45mA, when the processing module 200 detects that the supply current corresponding to the current detection signal is less than 4mA, it determines the antenna status as open circuit, indicating that the antenna module has an open circuit fault or is not connected. When the processing module 200 detects that the supply current corresponding to the current detection signal is between 4mA and 45mA, it determines the antenna status as normal operation, indicating that the antenna module is working normally. When the processing module 200 detects that the supply current corresponding to the current detection signal is greater than 45mA, it determines the antenna status as short circuit, indicating that the antenna module has a short circuit fault.

[0017] In some of these embodiments, such as Figure 2 As shown, the antenna power supply circuit may also include a current limiting module 300. The current limiting module 300 is connected between the power supply branch 102 and the antenna port RF_IN_ANT, and is connected to the signal output terminal 104, and is used to limit the current of the power supply branch 102 according to the current detection signal.

[0018] It is understood that this embodiment is based on a mirror current source module. By adding a current limiting module to a mirror current source module, the current limiting function can be realized according to the current detection signal output by the mirror current source module. There is no need to set up a separate current limiting chip and current limiting detection chip, which can further reduce the cost of the antenna power supply circuit.

[0019] As an example, such as Figure 5 and 6 As shown, the current limiting module 300 may include a fifth switching device Q5. The fifth switching device Q5 includes a first electrode connected to the power supply branch 102, a second electrode connected to the antenna port RF_IN_ANT, and a control electrode connected to the signal output terminal 104.

[0020] It should be noted that the fifth switching device Q5 can be a PMOS transistor, with its first electrode as the source, second electrode as the drain, and control electrode as the gate. The current limiting principle is: as the supply current increases, the collector current I of the fourth switching device Q4... cQ4 Increase the voltage V at signal output terminal 104 104 The increase in voltage causes a decrease in the absolute value of the gate-source voltage of the fifth switching device Q5, increasing the on-resistance Rds and thus reducing the supply current, thereby creating negative feedback to limit the supply current. This is achieved by appropriately setting the resistance value R5 of the fifth resistor and the on-threshold voltage V of the fifth switching device Q5. gsthQ5 This allows setting the current limiting threshold I0 for the antenna's power supply. For example, if the voltage drop across the third resistor R3 and the voltage drop across the third switching device Q3 are ignored, the current limiting threshold I0 can be determined by the following formula: (R3 / R4)×I0×R5-V P5V0 =V gsthQ5 ; V P5V0 This refers to the output voltage of the power supply.

[0021] In some embodiments, the processing module 200 is also used to output power supply control signals. For example... Figure 3As shown, the antenna power supply circuit may further include a power supply control module 400. The power supply control module 400 is connected to the processing module 200, the antenna port RF_IN_ANT, and the current limiting module 300, respectively. It outputs a switch control signal to the current limiting module 300 based on the power supply control signal and the antenna voltage signal at the antenna port RF_IN_ANT. When both the power supply control signal and the antenna voltage signal are at a first level, it outputs an effective level switch control signal to control the current limiting module 300 to turn on. When at least one of the power supply control signal and the antenna voltage signal is at a second level, it outputs an ineffective level switch control signal to control the current limiting module 300 to turn off.

[0022] In this embodiment, the first level can be a high level, and the second level can be a low level. The power supply control signal is used to control whether to supply power to the antenna. The antenna voltage signal can be the voltage applied to the antenna module or the voltage induced by the antenna module. The current limiting module 300 can also act as an on / off control switch for the line between the power supply branch 102 and the antenna port RF_IN_ANT, so as to switch the power supply branch 102 to the antenna module connected to the antenna port RF_IN_ANT according to the switch control signal to turn on or off, and to realize the short circuit protection function. In specific implementation, when power is needed for the antenna module, the processing module 200 outputs a first-level power supply control signal. If the antenna voltage signal is at the first level, the power supply control module 400 outputs an effective-level switch control signal to control the current limiting module 300 to conduct, connecting the power supply branch 102 and the antenna port RF_IN_ANT, thus powering the antenna module. When power needs to be stopped, the processing module 200 outputs a second-level power supply control signal, causing the power supply control module 400 to output an ineffective-level switch control signal to control the current limiting module 300 to turn off, disconnecting the power supply branch 102 and the antenna port RF_IN_ANT, thereby achieving the switching function of power supply to the antenna module. Furthermore, when the antenna port RF_IN_ANT is short-circuited to ground, the antenna voltage signal jumps to the second level, causing the power supply control module 400 to output an ineffective-level switch control signal to control the current limiting module 300 to turn off, disconnecting the power supply branch 102 and the antenna port RF_IN_ANT, thus achieving short-circuit protection. When the processing module 200 outputs a first-level power supply control signal and the short circuit to ground at the antenna port RF_IN_ANT is eliminated, the power supply control module 400 outputs a valid-level switch control signal to control the current limiting module 300 to re-conduct and automatically restore power supply to the antenna module.

[0023] In some of these embodiments, such as Figure 4As shown, the antenna power supply circuit may further include a switch module 500. The switch module 500 is connected to the power supply control module, the power supply P5V0, and the power input terminal 101, respectively. It is used to control the connection between the power supply and the power input terminal 101 according to a valid level switch control signal, and to control the disconnection between the power supply and the power input terminal 101 according to an invalid level switch control signal.

[0024] In this embodiment, a switch module 500, other than the current limiting module, can switch the power supply branch 102 to the antenna module connected to the antenna port RF_IN_ANT based on the switch control signal of the power supply control module, and implement short-circuit protection. In this case, the current limiting module 300 only needs to implement the current limiting function. Specifically, when power needs to be supplied to the antenna module, the processing module 200 outputs a first-level power supply control signal. If the antenna voltage signal is at the first level, the power supply control module 400 outputs an effective-level switch control signal to control the switch module 500 to turn on, connecting the power supply P5V0 to the power input terminal 101, thus supplying power to the antenna module. When power needs to be stopped, the processing module 200 outputs a second-level power supply control signal, causing the power supply control module 400 to output an ineffective-level switch control signal to control the switch module 500 to turn off, disconnecting the power supply P5V0 from the power input terminal 101, thus realizing the switching function of supplying power to the antenna module. Furthermore, when the antenna port RF_IN_ANT is short-circuited to ground, the antenna voltage signal jumps to the second level, causing the power supply control module 400 to output an invalid level switch control signal to control the switch module 500 to turn off, disconnecting the line between the power supply P5V0 and the power input terminal 101, thus achieving short-circuit protection. When the processing module 200 outputs a first level power supply control signal and the short circuit to ground at the antenna port RF_IN_ANT is eliminated, the power supply control module 400 outputs an valid level switch control signal to control the switch module 500 to turn on again, automatically restoring antenna power supply.

[0025] Therefore, in this embodiment, the power supply control module controls the on / off state of the current limiting module or the switching module together with the power supply control signal of the processing module and the antenna voltage signal of the antenna port. Without the need to set up an additional antenna short-circuit protection circuit, it can not only realize the switching function of antenna power supply, but also realize the antenna short-circuit protection function. This reduces the number of short-circuit protection devices in the antenna power supply circuit, reduces the space volume of the antenna power supply circuit, and saves the hardware cost of the antenna power supply circuit.

[0026] In some specific embodiments, such as Figure 5As shown, the power supply control module 400 may include a first unidirectional conduction unit 401, a second unidirectional conduction unit 402, and a control unit 403. The first unidirectional conduction unit 401 is connected to the processing module 200 and is used to receive the power supply control signal ANT_OFF, and is turned off when the power supply control signal is at a first level and turned on when the power supply control signal is at a second level. The second unidirectional conduction unit 402 is connected to the antenna port RF_IN_ANT and is used to receive the antenna voltage signal, and is turned off when the antenna voltage signal is at a first level and turned on when the antenna voltage signal is at a second level. The control unit 403 is connected to the first unidirectional conduction unit 401 and the second unidirectional conduction unit 402 respectively, and is connected to the current limiting module 300. It is used to output a valid level switch control signal when both the first unidirectional conduction unit 401 and the second unidirectional conduction unit 402 are turned off, and to output an invalid level switch control signal when at least one of the first unidirectional conduction unit 401 and the second unidirectional conduction unit 402 is turned on. In some other specific embodiments, such as... Figure 6 As shown, the control unit 403 is connected to the first unidirectional conduction unit 401 and the second unidirectional conduction unit 402, and is also connected to the switch module 500.

[0027] In this embodiment, an AND logic relationship is formed by two unidirectional conduction units, enabling dual condition judgment of the control commands from the processing module and the actual voltage signal at the antenna port. The current limiting module or switching module is only allowed to conduct when both are at valid levels. Any abnormal level (such as the processing module actively shutting off the antenna power supply or a short circuit to ground at the antenna port) can independently trigger the current limiting module or switching module to shut down, enhancing the anti-interference capability of the antenna power supply circuit. Simultaneously, unidirectional conduction isolates electrical crosstalk between the processing module and the antenna port, preventing mutual signal interference. The control unit only needs to perform simple level judgment to output the switching control signal, eliminating the need for complex timing or protocol analysis, resulting in fast response and high reliability. Furthermore, using unidirectional conduction units to access the antenna voltage signal results in a simpler circuit structure compared to using an operational amplifier-based short-circuit detection circuit to detect short circuits at the antenna port, making it easier to integrate at low cost into the RF front-end of the antenna power supply circuit.

[0028] As an example, such as Figure 5As shown, the first unidirectional conduction unit 401 may include a first diode D1, which includes a cathode connected to the processing module 200 and an anode connected to the control unit 403. The second unidirectional conduction unit 402 may include a second diode D2, which includes a cathode connected to the antenna port RF_IN_ANT and an anode connected to the control unit 403. The control unit 403 may include a ninth switching device Q9, an eighteenth resistor R18, and a nineteenth resistor R19. The ninth switching device Q9 includes a first electrode connected to the power input terminal 101, a second electrode connected to the current limiting module 300, and a control electrode connected to one end of the nineteenth resistor R19. The other end of the nineteenth resistor R19 is connected to the anode of the first diode D1 and the anode of the second diode D2. The eighteenth resistor R18 is connected between the first electrode of the ninth switching device Q9 and the control electrode of the ninth switching device Q9.

[0029] It should be noted that the first diode D1 and the second diode D2 form an AND gate. When the cathode of either diode is low, the common node of the anodes of both diodes is low; when both diode cathodes are high, the common node is high. As an example, the first diode D1 and the second diode D2 can be Schottky diodes to achieve fast switching and low voltage drop. The control electrode of the ninth switching device Q9 is connected to this common node through the nineteenth resistor R19 to receive the switching control signal output from the AND gate. The eighteenth resistor R18 is connected between the first electrode and the control electrode of the ninth switching device Q9 as a pull-up resistor, ensuring that the ninth switching device Q9 is reliably turned off when the common node of the first diode D1 and the second diode D2 is high.

[0030] In specific implementation, when the power supply control signal ANT_OFF output by the processing module 200 is low, and / or the antenna port RF_IN_ANT is in normal working condition (i.e., the RF_IN_ANT voltage is higher than 3V or the impedance to ground is normal), and the antenna voltage signal is low, the common node of the first diode D1 and the second diode D2 is low, the control electrode voltage of the ninth switching device Q9 is lower than its source voltage, the ninth switching device Q9 is turned on, and it outputs a low-level switching control signal to the current limiting module 300 through the second electrode, thereby controlling the current limiting module 300 to turn off so that the power supply branch 102 can supply power to the outside. Conversely, when the power supply control signal ANT_OFF output by the MCU is validly high (or in a high-impedance floating state), and the antenna port is in normal working condition (i.e., the RF_IN_ANT voltage is higher than 3V or the impedance to ground is normal), and the antenna voltage signal is high, the first diode D1 and the second diode D2 are both turned off, and the control electrode potential of the ninth switching device Q9 is pulled up to the +5V of the power supply P5V0 through the eighteenth resistor R18. At this time, the control electrode potential of the ninth switching device Q9 is equal to the source electrode potential, the ninth switching device Q9 is turned off, and an invalid level switching control signal is output, so that the current limiting module 300 returns to the current limiting working mode and supplies power normally to the outside.

[0031] Therefore, this embodiment uses a single power supply P5V0 to directly power the power supply branch 102 through the power input terminal 101, which avoids the startup uncertainty caused by the timing difference between the power supply P5V0 and the power input terminal 101 due to the switching module 500. Furthermore, the control unit 403 may also include a fifth capacitor C5 connected between the control electrode of the ninth switching device Q9 and ground, or between the power input terminal 101 and ground, to suppress the instantaneous potential jump of the common node of the first diode D1 and the second diode D2 during the circuit power-on startup process, ensuring that the ninth switching device Q9 will not be mis-connected due to transient interference, thereby effectively avoiding the "hiccup" phenomenon (i.e., repeated power supply switching) during startup. Furthermore, since the eighteenth resistor R18 can pull up the potential of the common node of the first diode D1 and the second diode D2 to the potential of the power supply P5V0, when the processing module 200 outputs a low-level power supply control signal, the output pin of the processing module 200 will bear a sink current from +5V. Therefore, in actual design, the sink current can be limited by limiting the resistance ratio of the eighteenth resistor R18 and the nineteenth resistor R19, ensuring that the sink current is within the maximum withstand range of the output pin of the processing module 200, thereby ensuring the long-term reliability of the system. At the same time, the resistance design of the eighteenth resistor R18 and the nineteenth resistor R19 also needs to take into account that when the antenna port voltage is 3V, the potential of the common node of the first diode D1 and the second diode D2 will not accidentally turn on the ninth switching device Q9. That is, the control electrode voltage of the ninth switching device Q9 after voltage division by the eighteenth resistor R18 and the nineteenth resistor R19 must be higher than the turn-off threshold of the ninth switching device Q9.

[0032] As another example, such as Figure 6 As shown, the control unit 403 may include a first switching device Q1. The first switching device Q1 includes a control electrode connected to the operating voltage P3V3, a first electrode connected to the switching module 500, and a grounded second electrode. The control electrode of the first switching device Q1 is also connected to the anode of the first diode D1 and the anode of the second diode D2.

[0033] like Figure 6As shown, the control electrode of the first switching device Q1 is connected to the common node of the first diode D1 and the second diode D2. The control unit 403 may also include a pull-up resistor R13, a pull-down resistor R14, a delay resistor R15, and a delay capacitor C1. The pull-up resistor R13 is connected between the operating voltage P3V3 and the common node, providing a high level for the control electrode of the first switching device Q1. The pull-down resistor R14 is connected between the common node and ground, keeping the control electrode of the first switching device Q1 at a low level by default when the operating voltage P3V3 is not powered on. The delay resistor R15 and the delay capacitor C1 form a delay circuit, connected between the common node and the control electrode of the first switching device Q1. Adjusting the resistance of the delay resistor R15 and the capacitance of the delay capacitor C1 can adjust the delay of the control signal to the switching module 500 according to actual needs. The first switching device Q1 can be an NPN transistor. When both the power supply control signal ANT_OFF and the antenna voltage signal are high, the operating voltage P3V3 is pulled up to a high level by the pull-up resistor R13, acting as the control voltage for the first switching device Q1. When the control voltage of the first switching device Q1 is greater than its conduction threshold, the first switching device Q1 is turned on, outputting a valid switching control signal through the second electrode. When the power supply control signal ANT_OFF is low, turning on the first diode D1, and / or when the antenna port RF_IN_ANT is shorted to ground, turning on the second diode D2, the control voltage of the first switching device Q1 is pulled down to a low level, and the first switching device Q1 is turned off, outputting an invalid switching control signal. The valid level of the switching control signal is low.

[0034] Furthermore, in this embodiment, during the power-on process of the antenna power supply circuit, the antenna voltage signal rises from 0V to the supply voltage. While the antenna voltage signal is still at a low level, the control voltage of the first switching device does not change due to the presence of the operating voltage and the pull-up resistor. Therefore, the first switching device will not repeatedly switch its operating state during the power-on process, preventing the switching module from repeatedly switching its on / off state. Compared to using an LDO for power supply, where the antenna voltage signal is extracted from the LDO's output node for short-circuit protection, this avoids the repeated restarting and hiccuping phenomenon in the antenna power supply circuit. Moreover, by using the second diode D2 to extract the antenna voltage signal, the cathode voltage of the second diode D2 is directly pulled low when the antenna port is short-circuited, reducing the turn-off time of the short-circuit protection and improving its reliability.

[0035] In some specific embodiments, such as Figure 6As shown, the switching module 500 may include a second switching device Q2, a first resistor R1, and a second resistor R2. The second switching device Q2 includes a first electrode connected to the power supply P5V0, a ​​second electrode connected to the power input terminal 101, and a control electrode connected to the power supply control module 400. The first resistor R1 is connected between the first electrode of the second switching device Q2 and the control electrode of the second switching device Q2. The second resistor R2 is connected between the power supply control module 400 and the control electrode of the second switching device Q2.

[0036] It should be noted that the second switching device Q2 can be a PMOS transistor, with its first electrode as the source, its second electrode as the drain, and its control electrode as the gate. When the first switching device Q1 is off, the current in the first resistor R1 is 0, the gate-source voltage of the second switching device Q2 is 0, the second switching device Q2 is off, the power input port 101 is not powered, and therefore the antenna port RF_IN_ANT is not powered. When the first switching device Q1 is on, it makes the gate-source voltage of the second switching device Q2 less than its turn-on threshold voltage, the second switching device Q2 is on, the power input port 101 can be powered, and thus the power supply branch 102 is turned on, so that the antenna port RF_IN_ANT can be powered.

[0037] In some specific embodiments, such as Figure 5 and 6 As shown, the power supply branch 102 may include a third switching device Q3 and a third resistor R3. The detection branch 103 may include a fourth switching device Q4, a fourth resistor R4, and a fifth resistor R5. The third switching device Q3 includes a first electrode connected to the power input terminal 101, a second electrode connected to the antenna port RF_IN_ANT, and a control electrode connected to the fourth switching device Q4. The control electrode of the third switching device Q3 is also connected to its own second electrode. The third resistor R3 is connected between the power input terminal 101 and the first electrode of the third switching device Q3. The fourth switching device Q4 includes a first electrode connected to the power input terminal 101, a second electrode connected to the signal output terminal 104, and a control electrode connected to the third switching device Q3. The fourth resistor R4 is connected between the power input terminal 101 and the first electrode of the fourth switching device Q4. The fifth resistor R5 is connected between the second electrode of the fourth switching device Q4 and ground.

[0038] In this embodiment, the third switching device Q3 and the fourth switching device Q4 can be PNP transistors. The control electrode of the third switching device Q3 is shorted to the second electrode to form a diode connection. The control electrodes of the third switching device Q3 and the fourth switching device Q4 are connected to a common junction P, forming a mirror current source. The working principle of the mirror current source is as follows: the third resistor R3 is connected in series with the emitter and base of the third switching device Q3, and the fourth resistor R4 is connected in series with the emitter and base of the fourth switching device Q4. The two series branches are connected in parallel, making V... R3 +V ebQ3 =V R4 +V ebQ4 V R3 V is the voltage difference across the third resistor R3. ebQ3 V is the emitter-base voltage of the third switching device Q3. R4 V is the voltage difference across the fourth resistor R4. ebQ4 This is the emitter-base voltage of the fourth switching device Q4; since the emitter-base voltage V when the transistor is working normally... eb Since the forward voltage is approximately constant (e.g., 0.7V), V can be approximated as... ebQ3 =V ebQ4 This makes V R3 =V R4 ; and V R3 =I eQ3 ×R3,V R4 =I eQ4 ×R4, R3 is the resistance of the third resistor R3, and R4 is the resistance of the fourth resistor R4, so I eQ3 ×R3=I eQ4 ×R4, which is I eQ4 =(R3 / R4)×I eQ3 I eQ3 I is the emitter current of the third switching device Q3. eQ4 This is the emitter current of the fourth switching device Q4; based on this, and since the emitter current of the transistor is approximately equal to the collector current, the collector current I of the fourth switching device Q4 is... cQ4 =(R3 / R4)×I cQ3 The collector current I of the third switching device Q3 cQ3 =(R4 / R3)×I cQ4 It can be seen that I cQ3 That is, the supply current of the antenna that needs to be detected. Therefore, after the resistance values ​​of the third resistor R3 and the fourth resistor R4 are determined, it is only necessary to detect I. cQ4 I can be calculated cQ3 Therefore, the current detection signal V 104 = I cQ4×R5 enables the processing module 200 to calculate the antenna's power supply current based on the current detection signal, thereby realizing antenna status detection.

[0039] In addition, it should be noted that the mirror current source module itself has a certain degree of suppression effect on temperature changes and has high current detection accuracy; while antenna status detection only needs to determine the range of the power supply current, without needing to accurately measure the current value of the power supply current. Therefore, the mirror current source module composed of discrete components in this embodiment can meet the needs of antenna status diagnosis, without the need to use a current detection chip.

[0040] In some of these embodiments, such as Figure 4 As shown, the antenna power supply circuit may further include a signal conditioning module 700. The signal conditioning module 700 is connected to the signal output terminal 104 and is used to filter and convert the current detection signal to obtain a conditioned current detection signal. The processing module 200 is connected to the signal conditioning module 700 and is used to determine the antenna state based on the conditioned current detection signal.

[0041] It should be noted that, as Figure 5 and 6 As shown, the signal conditioning module 700 may include a first conditioning resistor R16, a second conditioning resistor R17, and a conditioning capacitor C2. The first conditioning resistor R16 is connected between the signal output terminal 104 and the sampling terminal of the processing module 200. The second conditioning resistor R17 and C2 are respectively connected between the sampling terminal of the processing module 200 and ground. The first conditioning resistor R16 and the second conditioning resistor R17 attenuate the voltage of the current detection signal to a voltage range that the ADC port of the processing module 200 can withstand, thus preventing high voltage from damaging the processing module 200. The conditioning capacitor C2 is used for filtering the current detection signal. The processing module 200 reads the voltage of the ADC (Analog-to-Digital Converter) port and then converts it to obtain the antenna's supply current.

[0042] In some embodiments, such as Figure 4 As shown, the antenna power supply circuit may also include a protection module 800. The protection module 800 is connected between the current limiting module 300 and the antenna port RF_IN_ANT, and is used to shield against electrostatic interference and prevent high voltage backflow.

[0043] As an example, such as Figure 5 and 6As shown, the protection module 800 may include a TVS (Transient Voltage Suppressor) transistor D4, an inductor L1, a first filter capacitor C3, a second filter capacitor C4, and a third diode D3. The antenna port RF_IN_ANT is connected to the antenna connector port. The TVS transistor D4 is mainly used to protect the antenna port RF_IN_ANT from electrostatic discharge and surge interference. The main functions of the inductor L1, the first filter capacitor C3, and the second filter capacitor C4 are to isolate the RF signal of the antenna port RF_IN_ANT from the power supply signal, and to filter the power supply signal. The power supply provides current to the antenna end through the third diode D3 and the inductor L1. The third diode D3 is used to prevent high voltage from the antenna connector port from entering the power supply circuit, protecting the power supply system of the antenna power supply circuit. In addition, the cathode of the second diode D2 is connected to the cathode side of the third diode D3 to obtain the antenna voltage signal.

[0044] In some embodiments, such as Figures 7 to 9 As shown, the antenna power supply circuit may further include an overcurrent detection module 600. The overcurrent detection module 600 is connected to both the power input terminal 101 and the power supply branch 102, and is used to detect the supply current and output a corresponding overcurrent detection signal. The current limiting module 300 is connected between the power supply branch 102 and the antenna port RF_IN_ANT, and is also connected to the overcurrent detection module 600, used to limit the current in the power supply branch 102 based on the overcurrent detection signal.

[0045] In this embodiment, the overcurrent detection signal and the current detection signal are separated by the overcurrent detection module, and the amplification factor and current limiting threshold of the current detection signal can be set independently.

[0046] As an example, such as Figure 7 As shown, the overcurrent detection module 600 may include a sixth switching device Q6, a sixth resistor R6, and a seventh resistor R7. The sixth switching device Q6 includes a first electrode connected to the power input terminal 101, a second electrode connected to the current limiting module 300, and a control electrode connected to the power supply branch 102. The sixth resistor R6 is connected between the power input terminal 101 and the first electrode of the sixth switching device Q6. The seventh resistor R7 is connected between the second electrode of the sixth switching device Q6 and ground. The control electrode of the sixth switching device Q6 is connected between the third resistor R3 and the first electrode of the third switching device Q3.

[0047] It should be noted that the sixth switching device Q6 can be a PNP transistor. The emitter-base voltage of the sixth switching device Q6 is equal to the voltage across the third resistor R3. When the supply current increases, causing the voltage across the third resistor R3 to increase to the conduction threshold voltage of the sixth switching device Q6 (e.g., 700mV), the sixth switching device Q6 turns on. The overcurrent detection signal voltage output from the second electrode of the sixth switching device Q6 increases, the absolute value of the gate-source voltage of the fifth switching device Q5 decreases, and the on-resistance increases, thereby reducing the supply current and achieving the effect of current limiting.

[0048] As another example, such as Figure 8 As shown, with Figure 7 Compared to the example shown, the difference is that the control electrode of the sixth switching device Q6 is connected to the common contact point P of the power supply branch 102 and the detection branch 103, so that the third switching device Q3, the fourth switching device Q4 and the sixth switching device Q6 form a three-transistor mirror current source structure.

[0049] It should be noted that the mirror current source structure itself has a certain suppression effect on temperature changes. Therefore, this embodiment borrows the principle of the mirror current source to obtain the overcurrent detection signal, which has good temperature characteristics. The principle of the three-transistor mirror current source is as follows: For ease of explanation, R3=R4=R6, where R6 is the resistance value of the sixth resistor. The emitter-base of the three transistors are connected in series with the three resistors and then in parallel. At this time, the emitter-base voltages of the third switching device Q3, the fourth switching device Q4, and the sixth switching device Q6 are exactly the same. Therefore, even with temperature changes, the emitter currents of the three transistors are exactly equal. Assuming that the three transistors have good consistency, the amplification factor hfe of the transistors changes by the same amount when the temperature changes; since I... c =I eb ×h fe Therefore, the collector currents of the three transistors are equal. In other words, the characteristic of "equal collector currents" is independent of temperature. As long as the collector currents of the three transistors are equal (and increase or decrease with temperature), the voltage of the overcurrent detection signal and the voltage of the current detection signal can reflect the magnitude of the supply current without being affected by temperature, thereby achieving the effect that the current limiting detection signal and the current detection signal are not affected by temperature.

[0050] Furthermore, in practical applications, R3, R4, and R6 may not be equal. Since the transistor mainly operates in the amplification region, according to the VI characteristic of the transistor between the emitter and base, the voltage drop across the transistor remains almost constant when the current flowing through it changes. Therefore, the emitter-base voltages of the three transistors can still be approximated as equal. Adjusting the values ​​of the seventh resistor R7 and the sixth resistor R6 can adjust the ratio of the overcurrent detection signal voltage to the supply current, ensuring that when the supply current reaches the current limiting threshold, the difference between the overcurrent detection signal voltage and the voltage at the first electrode of the fifth switching device Q5 equals the conduction threshold voltage of Q5.

[0051] As yet another example, such as Figure 9 As shown, with Figure 7 Compared to the illustrated embodiment, the difference lies in that the overcurrent detection module 600 is implemented using a differential comparator circuit. The overcurrent detection module 600 may include a seventh switching device Q7, an eighth switching device Q8, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. The seventh switching device Q7 includes a first electrode connected to the power input terminal 101, a second electrode grounded through the ninth resistor R9, and a control electrode connected to the first terminals of the eleventh resistor R11 and the twelfth resistor R12; the second terminal of the eleventh resistor R11 is connected to the power input terminal 101, and the second terminal of the twelfth resistor R12 is grounded. The eighth switching device Q8 includes a first electrode connected to the power input terminal 101, a second electrode grounded through the tenth resistor R10, and a control electrode connected to the power supply branch 102; the second electrode of the eighth switching device Q8 is also connected to the current limiting module 300. The eighth resistor R8 is connected between the power input terminal 101 and the first electrode of the seventh switching device Q7 and the first electrode of the eighth switching device Q8.

[0052] It should be noted that, Figure 7 and Figure 8The overcurrent detection signal changes slowly (linearly) with the supply current. An ideal overcurrent detection signal should resemble the output of a comparator: a low level when the supply current is below the current-limiting threshold, and a high level when the supply current exceeds the current-limiting threshold to limit the current. Therefore, this embodiment uses a differential comparator circuit with a dual-input, single-output configuration to construct the overcurrent detection module 600. Eleventh resistor R11 and twelfth resistor R12 divide the voltage at the power input terminal 101, providing a reference voltage for the control electrode of the seventh switching device Q7. The control electrode of the eighth switching device Q8 is connected between the third resistor R3 and the third switching device Q3 in the power supply branch 102, sampling a voltage proportional to the supply current. When the supply current is below the current-limiting threshold, the eighth switching device Q8 is off, the overcurrent detection signal is low, and the fifth switching device Q5 is fully turned on. When the supply current exceeds the current-limiting threshold, the differential comparator flips, the eighth switching device Q8 quickly turns on, the voltage of the overcurrent detection signal rises rapidly, the on-resistance of the fifth switching device Q5 increases, and the supply current is limited. Therefore, the introduction of a differential comparator circuit can not only improve the response speed of current limiting, but also offset some of the effects of temperature changes.

[0053] Next, the beneficial effects of the antenna power supply circuit of the embodiments of this application will be explained based on simulation verification results.

[0054] like Figure 10 As shown, Figure 10 for Figure 5 and Figure 6 The corresponding antenna power supply circuits are plotted as follows: current detection signal and antenna port voltage signal change with supply current at different ambient temperatures. L1 is the current detection signal change with supply current at an ambient temperature of 100℃; L2 is the current detection signal change with supply current at an ambient temperature of 25℃; L3 is the current detection signal change with supply current at an ambient temperature of -40℃; L4 is the antenna voltage signal change with supply current at an ambient temperature of 100℃; L5 is the antenna voltage signal change with supply current at an ambient temperature of 25℃; and L6 is the antenna voltage signal change with supply current at an ambient temperature of -40℃.

[0055] like Figure 11 As shown, Figure 11 for Figure 7The corresponding antenna power supply circuits are plotted as follows: current detection signal and antenna port voltage signal change with supply current at different ambient temperatures. L7 is the current detection signal change with supply current at an ambient temperature of 100℃; L8 is the current detection signal change with supply current at an ambient temperature of 25℃; L9 is the current detection signal change with supply current at an ambient temperature of -40℃; L10 is the antenna voltage signal change with supply current at an ambient temperature of 100℃; L11 is the antenna voltage signal change with supply current at an ambient temperature of 25℃; and L12 is the antenna voltage signal change with supply current at an ambient temperature of -40℃.

[0056] like Figure 12 As shown, Figure 12 for Figure 8 The corresponding antenna power supply circuits are plotted as follows: current detection signal and antenna port voltage signal change with supply current at different ambient temperatures. L13 shows the current detection signal change with supply current at an ambient temperature of 100℃; L14 shows the current detection signal change with supply current at an ambient temperature of 25℃; L15 shows the current detection signal change with supply current at an ambient temperature of -40℃; L16 shows the antenna voltage signal change with supply current at an ambient temperature of 100℃; L17 shows the antenna voltage signal change with supply current at an ambient temperature of 25℃; and L18 shows the antenna voltage signal change with supply current at an ambient temperature of -40℃.

[0057] like Figure 13 As shown, Figure 13 for Figure 9 The corresponding antenna power supply circuits show the curves of current detection signal, antenna port voltage signal, and overcurrent detection signal changing with supply current under different ambient temperatures. L19 shows the curve of overcurrent detection signal changing with supply current at an ambient temperature of 100℃; L20 shows the curve of overcurrent detection signal changing with supply current at an ambient temperature of 25℃; L21 shows the curve of overcurrent detection signal changing with supply current at an ambient temperature of -40℃; L22 shows the curve of current detection signal changing with supply current at an ambient temperature of 100℃; L23 shows the curve of current detection signal changing with supply current at an ambient temperature of 25℃; L24 shows the curve of current detection signal changing with supply current at an ambient temperature of -40℃; L25 shows the curve of antenna voltage signal changing with supply current at an ambient temperature of 100℃; L26 shows the curve of antenna voltage signal changing with supply current at an ambient temperature of 25℃; and L27 shows the curve of antenna voltage signal changing with supply current at an ambient temperature of -40℃.

[0058] It can be seen that the current detection signal is linearly correlated with the supply current under different ambient temperatures, and the proportionality coefficient is relatively large, which facilitates ADC measurement by the processing module. Similarly, the current limiting detection signal is also linearly correlated with the supply current under different ambient temperatures, and the proportionality coefficient is relatively large, allowing the fifth switching device Q5 to quickly implement the current limiting function based on the current limiting detection signal. Furthermore, the antenna voltage signal is linearly correlated with the supply current under different ambient temperatures, and the proportionality coefficient is relatively large, effectively supplying power to the antenna. Moreover, when the supply current is less than 70mA, the antenna voltage signals are basically identical under different ambient temperatures, indicating that the antenna voltage signal is less affected by ambient temperature. Therefore, the antenna power supply circuit of this embodiment can effectively supply power to the antenna under any ambient temperature.

[0059] In addition, such as Figure 13 As shown, the voltage of the overcurrent detection signal changes rapidly around the current threshold of 75mA, and the fluctuation of the current limiting threshold is small under different ambient temperatures: approximately 84.5mA at -40℃, approximately 75.8mA at 25℃, and approximately 71.3mA at 100℃. It is evident that the antenna power supply circuit provided in this embodiment has reliable current limiting protection.

[0060] Secondly, embodiments of this application also provide a vehicle including an antenna power supply circuit as described in any of the above embodiments.

[0061] It should be noted that the vehicle can be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not specifically limit it. In this embodiment, the vehicle also includes an on-board antenna module, which is connected to the antenna power supply circuit via the antenna port RF_IN_ANT. The antenna is powered by the antenna power supply circuit of any of the above embodiments in a POC (Proof-of-Concept) manner, and antenna status diagnosis is realized.

[0062] It should be noted that, in the description of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an apparatus or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an apparatus or system. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the apparatus or system that includes that element.

[0063] In the description of this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In the description of this application, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, "multiple" means two or more, unless otherwise explicitly defined.

[0065] In the description of this application, the suffixes such as "module," "part," or "unit" used to denote elements are merely for the purpose of illustration and have no specific meaning in themselves. Therefore, "module," "part," or "unit" can be used interchangeably. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An antenna power supply circuit, characterized in that, include: The mirror current source module includes a power input terminal, a power supply branch, a detection branch, and a signal output terminal; The power input terminal is used to connect to the power supply. The power supply branch is connected to the power input terminal and the antenna port respectively, and switches its working state to the on state in response to the power supply power supply state, so as to supply power to the antenna module connected to the antenna port. The detection branch is connected to the power supply branch, the power input terminal and the signal output terminal respectively, and is used to detect the power supply current of the power supply branch and output the corresponding current detection signal to the signal output terminal. The processing module, connected to the signal output terminal, is used to determine the antenna state of the antenna module based on the current detection signal.

2. The antenna power supply circuit according to claim 1, characterized in that, Also includes: A current limiting module is connected between the power supply branch and the antenna port, and is connected to the signal output terminal, for limiting the current of the power supply branch according to the current detection signal.

3. The antenna power supply circuit according to claim 2, characterized in that, The processing module is also used to output power supply control signals; The antenna power supply circuit also includes: The power supply control module is connected to the processing module, the antenna port, and the current limiting module, respectively. It is used to output a switch control signal to the current limiting module according to the power supply control signal and the antenna voltage signal of the antenna port. When both the power supply control signal and the antenna voltage signal are at a first level, it outputs an effective level switch control signal to control the current limiting module to turn on. When at least one of the power supply control signal and the antenna voltage signal is at a second level, it outputs an invalid level switch control signal to control the current limiting module to turn off.

4. The antenna power supply circuit according to claim 3, characterized in that, Also includes: A switching module is connected to the power supply control module, the power supply, and the power input terminal respectively, and is used to control the conduction of the line between the power supply and the power input terminal according to the active level switching control signal, and to control the disconnection of the line between the power supply and the power input terminal according to the inactive level switching control signal. The switching module includes a second switching device, a first resistor, and a second resistor; The second switching device includes a first electrode connected to the power supply, a second electrode connected to the power input terminal, and a control electrode connected to the power supply control module; The first resistor is connected between the first electrode of the second switching device and the control electrode of the second switching device; The second resistor is connected between the power supply control module and the control electrode of the second switching device.

5. The antenna power supply circuit according to claim 3 or 4, characterized in that, The power supply control module includes: The first unidirectional conduction unit is connected to the processing module and is used to receive the power supply control signal, and to be turned off when the power supply control signal is at the first level and turned on when the power supply control signal is at the second level. The second unidirectional conduction unit is connected to the antenna port and is used to receive the antenna voltage signal, and is turned off when the antenna voltage signal is at the first level and turned on when the antenna voltage signal is at the second level. The control unit is connected to the first unidirectional conduction unit and the second unidirectional conduction unit respectively, and is also connected to the current limiting module or the switching module. It is used to output a switch control signal with an effective level when both the first unidirectional conduction unit and the second unidirectional conduction unit are turned off, and to output a switch control signal with an invalid level when at least one of the first unidirectional conduction unit and the second unidirectional conduction unit is turned on.

6. The antenna power supply circuit according to claim 5, characterized in that, The first unidirectional conduction unit includes a first diode, which includes a cathode connected to the processing module and an anode connected to the control unit; The second unidirectional conduction unit includes a second diode, which includes a cathode connected to the antenna port and an anode connected to the control unit; The control unit includes a ninth switching device, an eighteenth resistor, and a nineteenth resistor. The ninth switching device includes a first electrode connected to the power input terminal, a second electrode connected to the current limiting module, and a control electrode connected to one end of the nineteenth resistor. The other end of the nineteenth resistor is connected to the anode of the first diode and the anode of the second diode. The eighteenth resistor is connected between the first electrode of the ninth switching device and the control electrode of the ninth switching device; or The control unit includes a first switching device, which includes a control electrode connected to the operating voltage, a first electrode connected to the switching module, and a grounded second electrode. The control electrode of the first switching device is also connected to the anode of the first diode and the anode of the second diode.

7. The antenna power supply circuit according to claim 1, characterized in that, The power supply branch includes a third switching device and a third resistor, and the detection branch includes a fourth switching device, a fourth resistor, and a fifth resistor. The third switching device includes a first electrode connected to the power input terminal, a second electrode connected to the antenna port, and a control electrode connected to the fourth switching device. The control electrode of the third switching device is also connected to its own second electrode. The third resistor is connected between the power input terminal and the first electrode of the third switching device. The fourth switching device includes a first electrode connected to the power input terminal, a second electrode connected to the signal output terminal, and a control electrode connected to the third switching device; the fourth resistor is connected between the power input terminal and the first electrode of the fourth switching device; and the fifth resistor is connected between the second electrode of the fourth switching device and ground.

8. The antenna power supply circuit according to claim 2, characterized in that, The current limiting module includes a fifth switching device; The fifth switching device includes a first electrode connected to the power supply branch, a second electrode connected to the antenna port, and a control electrode connected to the signal output terminal; And / or, The antenna power supply circuit also includes an overcurrent detection module; the overcurrent detection module is connected to the power input terminal and the power supply branch respectively, and is used to detect the power supply current and output a corresponding overcurrent detection signal. The current limiting module is connected between the power supply branch and the antenna port, and is connected to the overcurrent detection module, for limiting the current of the power supply branch according to the overcurrent detection signal.

9. The antenna power supply circuit according to claim 8, characterized in that, The overcurrent detection module includes a sixth switching device, a sixth resistor, and a seventh resistor; The sixth switching device includes a first electrode connected to the power input terminal, a second electrode connected to the current limiting module, and a control electrode connected to the power supply branch or the common connection point of the power supply branch and the detection branch; the sixth resistor is connected between the power input terminal and the first electrode of the sixth switching device; the seventh resistor is connected between the second electrode of the sixth switching device and ground. Alternatively, the overcurrent detection module may include a seventh switching device, an eighth switching device, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor. The seventh switching device includes a first electrode connected to the power input terminal, a second electrode grounded through the ninth resistor, and a control electrode connected to the first terminal of the eleventh resistor and the first terminal of the twelfth resistor; the second terminal of the eleventh resistor is connected to the power input terminal, and the second terminal of the twelfth resistor is grounded. The eighth switching device includes a first electrode connected to the power input terminal, a second electrode grounded through the tenth resistor, and a control electrode connected to the power supply branch; the second electrode of the eighth switching device is also connected to the current limiting module. The eighth resistor is connected between the power input terminal and the first electrode of the seventh switching device and the first electrode of the eighth switching device.

10. A vehicle, characterized in that, include: The antenna power supply circuit as described in any one of claims 1 to 9.

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