Vehicle-mounted GPS antenna diagnosis and protection circuit and vehicle

Abstract

The utility model relates to a vehicle-mounted GPS antenna diagnosis and protection circuit and a vehicle. The circuit comprises a power supply; the control module comprises a first ADC acquisition unit and a second ADC acquisition unit, and the first ADC acquisition unit is electrically connected with the power supply; the input end of the voltage conversion module is electrically connected with a power supply, and power supply signals of the input end are converted into antenna voltage to be output; the control end of the first control switch is electrically connected with the output end of the voltage conversion module, a reference signal is accessed to the second end of the first control switch, and the first control switch is switched on when antenna voltage is accessed to the control end of the first control switch; the first end of the second control switch is connected with the output end of the voltage conversion module, the control end of the second control switch is electrically connected with the first end of the first control switch, the second end of the second control switch is electrically connected with the second ADC acquisition unit, and the second control switch is switched on when a reference signal is connected to the control end of the second control switch; the control end of the first control switch and the second end of the second control switch are electrically connected with the GPS antenna.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of GPS antenna of vehicle, concretely relates to a vehicle GPS antenna diagnosis and protection's circuit and vehicle. BACKGROUND

[0002] With the wide application of global positioning system (GPS) in vehicle navigation and positioning, the stability and reliability of vehicle GPS antenna are particularly important. However, the existing vehicle GPS system often cannot detect in time and take effective measures to protect when encountering antenna damage or failure, thus leading to the function damage of vehicle navigation system or even complete failure. SUMMARY

[0003] The utility model provides a vehicle GPS antenna diagnosis and protection's circuit and vehicle, and mainly solves the problem that the existing vehicle GPS system cannot detect in time and take effective measures to protect when encountering antenna damage or failure.

[0004] The technical scheme of the utility model is:

[0005] The application provides a vehicle GPS antenna diagnosis and protection's circuit, which comprises:

[0006] A power supply;

[0007] A control module, the control module comprises a first ADC acquisition unit and a second ADC acquisition unit, the first ADC acquisition unit is electrically connected with the power supply;

[0008] A voltage conversion module, the input end of the voltage conversion module is electrically connected with the power supply, and the voltage conversion module is used for converting the power supply signal at the input end into an antenna voltage and then outputting;

[0009] A first control switch, the control end of the first control switch is electrically connected with the output end of the voltage conversion module, the second end of the first control switch is connected with a reference signal, and the first control switch is used for being turned on when the antenna voltage is connected with the control end;

[0010] A second control switch, the first end of the second control switch is electrically connected with the output end of the voltage conversion module, the control end of the second control switch is electrically connected with the first end of the first control switch, the second end of the second control switch is electrically connected with the second ADC acquisition unit of the control module, and the second control switch is used for being turned on when the reference signal is connected with the control end;

[0011] The control end of the first control switch and the second end of the second control switch are also electrically connected with a GPS antenna;

[0012] The control module judges the working state of the GPS antenna according to the first sampling voltage of the first ADC acquisition unit and the second sampling voltage of the second ADC acquisition unit.

[0013] Preferably, a pull-down resistor is connected between the control end and the second end of the first control switch.

[0014] Preferably, the voltage conversion module is a first resistor, a first end of the first resistor serving as an input end of the voltage conversion module, and a second end of the first resistor serving as an output end of the voltage conversion module.

[0015] Preferably, the first control switch is a triode, a base of the triode serving as the control end of the first control switch, a collector of the triode serving as the first end of the first control switch, and an emitter of the triode serving as the second end of the first control switch.

[0016] Preferably, the circuit for diagnosing and protecting the vehicle-mounted GPS antenna further comprises a second resistor and a third resistor, the collector of the triode being electrically connected to the output end of the voltage conversion module through the second resistor, the base of the triode being electrically connected to the output end of the voltage conversion module through the third resistor, and the base of the triode being further electrically connected to the GPS antenna through a sixth resistor.

[0017] Preferably, the second control switch is a MOS tube, a control end of the MOS tube serving as the control end of the second control switch, a first end of the MOS tube serving as the first end of the second control switch, and a second end of the MOS tube serving as the second end of the second control switch.

[0018] Preferably, the circuit for diagnosing and protecting the vehicle-mounted GPS antenna further comprises an inductor, the control end of the first control switch, the second end of the second control switch, and the second ADC acquisition unit of the control module all being electrically connected to the GPS antenna through the inductor.

[0019] Preferably, the circuit for diagnosing and protecting the vehicle-mounted GPS antenna further comprises a voltage division module, the second ADC acquisition unit of the control module being electrically connected to the second end of the second control switch through the voltage division module, wherein a first end of the voltage division module is electrically connected to the second end of the second control switch, a second end of the voltage division module is grounded, and a voltage division output end of the voltage division module is electrically connected to the second ADC acquisition unit of the control module.

[0020] Preferably, the voltage division module comprises a seventh resistor and an eighth resistor, a first end of the seventh resistor is a first end of the voltage division module, a second end of the seventh resistor and a first end of the eighth resistor are electrically connected, a second end of the seventh resistor is a voltage division output end of the voltage division module, and a second end of the eighth resistor is a second end of the voltage division module.

[0021] The application also provides a vehicle comprising the vehicle-mounted GPS antenna diagnosis and protection circuit.

[0022] The vehicle-mounted GPS antenna diagnosis and protection circuit has the advantages that:

[0023] The working state of the GPS antenna is diagnosed, so that abnormal problems of the GPS antenna can be found in time, the damage degree is reduced, the GPS antenna is prevented from being seriously damaged, the frequency of replacing the antenna is reduced, and the maintenance cost is reduced.

[0024] The first sampling voltage of the first ADC acquisition unit and the second sampling voltage of the second ADC acquisition unit are used to judge the open circuit, short circuit, overcurrent and other states of the GPS antenna, so that state information is fed back to the vehicle owner, and the vehicle owner can take effective measures (such as sending the vehicle for maintenance) to deal with the abnormal state in time. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a schematic diagram of a vehicle-mounted GPS antenna diagnosis and protection circuit in an embodiment of the application;

[0026] Figure 2 FIG. 3 is a current trend schematic diagram of the vehicle-mounted GPS antenna diagnosis and protection circuit when the GPS power supply is shorted to ground in the embodiment of the application;

[0027] Figure 3 FIG. 4 is a current trend schematic diagram of the vehicle-mounted GPS antenna diagnosis and protection circuit when the GPS power supply is open in the embodiment of the application. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are intended to explain the application, and are not intended to limit the application.

[0029] Reference is made to Figure 1 , Figure 2 and Figure 3The embodiment of the application provides a vehicle-mounted GPS antenna diagnosis and protection circuit, which comprises a power supply, a control module 1, a voltage conversion module 2, a first control switch 3 and a second control switch 4 and a GPS antenna 5.

[0030] With reference to Figure 1 The voltage conversion module 2 is a first resistor R1 with a resistance of 15Ω, the first end of the first resistor R1 is used as the input end of the voltage conversion module 2, and the second end of the first resistor R1 is used as the output end of the voltage conversion module 2.

[0031] In the embodiment of the application, the power supply is an LDO power supply, the actual supply voltage of the GPS antenna 5 is represented as V1, and the supply voltage of the LDO power supply is represented as V2, wherein the supply voltage V2 of the LDO power supply is between 3.85V and 4.502V, and the voltage drop range after the first resistor R1 and the second control switch 4 is 0.066V-0.771V. Figure 1 It can be determined that the first sampling voltage collected by the first ADC collection unit is equal to the supply voltage V2 of the LDO power supply, and the second sampling voltage collected by the second ADC collection unit needs to be converted according to different working states of the GPS antenna 5 to obtain the corresponding actual supply voltage V1 of the GPS antenna 5, and then the working state of the GPS antenna 5 is determined according to the supply voltage V2 of the LDO power supply and the actual supply voltage V1 of the GPS antenna 5.

[0032] In the embodiment of the application, the first control switch 3 is a triode Q1, the base of the triode Q1 is used as the control end of the first control switch 3, the collector of the triode Q1 is used as the first end of the first control switch 3, and the emitter of the triode Q1 is used as the second end of the first control switch 3.

[0033] In the embodiment of the present application, the triode Q1 can be an NPN triode, and the triode Q1 is turned on when the voltage between the base B and the emitter E of the triode Q1 is greater than a preset initial voltage threshold.

[0034] With reference to Figure 1 In the embodiment of the present application, the circuit for diagnosing and protecting the vehicle-mounted GPS antenna further comprises a second resistor R2 with a resistance of 10kΩ and a third resistor R3 with a resistance of 200Ω, the collector of the triode Q1 is electrically connected to the output end of the first resistor R1 through the second resistor R2, the base of the triode Q1 is electrically connected to the output end of the first resistor R1 through the third resistor R3, and the base of the triode Q1 is further electrically connected to the GPS antenna 5 through a sixth resistor R6.

[0035] The second resistor R2 and the third resistor R3 are voltage dividing resistors, and are mainly used for reducing the voltage in the circuit so that the triode Q1 meets the turn-on condition. The resistance values of the second resistor R2 and the third resistor R3 can be set according to actual needs, and the specific resistance values are not limited in the embodiment of the present application.

[0036] The second control switch 4 is a MOS tube Q2, the control end of the MOS tube Q2 serves as the control end of the second control switch 4, the first end of the MOS tube Q2 serves as the first end of the second control switch 4, and the second end of the MOS tube Q2 serves as the second end of the second control switch 4.

[0037] When the triode Q1 is turned on, the MOS tube Q2 is turned on when the voltage between the control end and the first end of the MOS tube Q2 is less than zero and reaches a threshold voltage. At this time, the triode Q1 and the MOS tube Q2 provide voltage for the GPS antenna 5.

[0038] It should be noted that the MOS tube Q2 can be a PMOS tube, the control end of the MOS tube Q2 can be a gate, the first end of the MOS tube Q2 can be a source, and the second end of the MOS tube Q2 can be a drain.

[0039] With reference to Figure 1 The circuit in the embodiment of the present application further comprises a voltage dividing module 6, and the second ADC sampling unit of the control module 1 is electrically connected to the second end of the second control switch 4 through the voltage dividing module 6, wherein the first end of the voltage dividing module 6 is electrically connected to the second end of the second control switch 4, the second end of the voltage dividing module 6 is grounded, the voltage dividing output end of the voltage dividing module 6 is electrically connected to the second ADC sampling unit of the control module 1, and the voltage dividing module 6 is used to divide the voltage between the first end and the second end thereof and output the voltage through the voltage dividing output end.

[0040] The first end of the voltage division module 6 is electrically connected with the second end of the second control switch 4, and the second end of the voltage division module 6 is grounded, so that the voltage is too high when the circuit works, and the circuit is prevented from entering the protection state, and the stability of the circuit is ensured. The voltage division module 6 is used for dividing the voltage between the first end and the second end of the voltage division module 6 and outputting the voltage through the voltage division output end, so that the second sampling voltage sampled by the second ADC sampling unit of the control module 1 is more accurate.

[0041] The voltage division module 6 includes a seventh resistor R7 with a resistance of 10KΩ and an eighth resistor R8 with a resistance of 10KΩ. The first end of the seventh resistor R7 serves as the first end of the voltage division module 6. The second end of the seventh resistor R7 is electrically connected with the first end of the eighth resistor R8. The second end of the seventh resistor R7 serves as the voltage division output end of the voltage division module 6. The second end of the eighth resistor R8 serves as the second end of the voltage division module 6.

[0042] The seventh resistor R7 and the eighth resistor R8 are sampling voltage division resistors. A part of the voltage is dropped on the seventh resistor R7 and the eighth resistor R8, so that the voltage between the voltage division module 6 is reduced. The actual supply voltage of the GPS antenna 5 can be obtained by using the sampling voltage division resistors. The resistance value can be selected according to the sampling range of the second ADC sampling unit of the control module 1. The resistance value of the seventh resistor R7 and the eighth resistor R8 can be set according to actual needs. The specific size of the resistance value is not limited in the embodiment of the utility model.

[0043] Referring to Figure 1 The circuit in the embodiment of the application further includes an inductor L1 with a value of 47mH. The second end of the second control switch 4 and the second ADC sampling unit of the control module 1 are electrically connected with the GPS antenna 5 through the inductor L1.

[0044] The inductor L1 is used for power isolation and filtering. The power isolation of the inductor L1 means that the initial supply voltage and the actual supply voltage of the GPS antenna 5 are separated, so that the control module 1 can accurately detect different states of the GPS antenna 5. The filtering function of the inductor L1 is an important measure to suppress and prevent interference.

[0045] Referring to Figure 1The circuit in this embodiment further includes a 2.2uF, 16V first capacitor C1; a 100nF, 50V second capacitor C2; a 100nF, 50V third capacitor C3; a 100pF, 50V fourth capacitor C4; a 10nF, 50V fifth capacitor C5; a 10nF, 50V sixth capacitor C6; and a bidirectional Zener diode D1 (model P2SD3V3X1BF). The first capacitors C1 to C6 serve as filter capacitors. The use of filter capacitors can make the circuit's operating performance more stable and also reduce the interference of ripple on the circuit. The bidirectional Zener diode D1 serves as an anti-static capacitor. The remaining capacitors mainly serve a filtering function; the first resistor R1 and the first capacitor C1 form an RC filter.

[0046] The circuit described in this embodiment can detect whether the GPS antenna 5 is short-circuited, open-circuited, overcurrent, or operating normally, as well as its recovery status after a fault. Specifically, the circuit determines the first sampling voltage acquired by the first ADC acquisition unit as the supply voltage V2 of the LDO power supply. The second sampling voltage acquired by the second ADC acquisition unit is converted into the actual supply voltage V1 of the GPS antenna 5 under different operating states of the GPS antenna 5. The calculated supply voltage V2 of the LDO power supply and the actual supply voltage V1 of the GPS antenna 5 under the corresponding state are then compared with the pre-calibrated supply voltage V2' of the LDO power supply and the actual supply voltage V1' of the GPS antenna 5 under the corresponding operating state, thereby identifying the operating state of the GPS antenna.

[0047] When the GPS antenna experiences a short ground fault, such as Figure 2 With inductor L1 shorted to ground, the base voltage VB of transistor Q1 is 0V, meaning transistor Q1 is in the off state. Figure 2 It can be seen that MOSFET Q2 is also in the off state at this time. When the GPS power supply is shorted to ground, the entire circuit can be simplified to the LDO power supply passing through the first resistor R1 to the third resistor R3 and then through the inductor L1 to ground. At this time, if the second sampling voltage collected by the second ADC acquisition unit is 0V, and the first sampling voltage collected by the first ADC acquisition unit is between 3.85-4.502V, then the calculated supply voltage V2 of the LDO power supply is between 3.85-4.502V, while the supply voltage V1 of the GPS antenna 5 is 0.

[0048] When the GPS antenna 5 recovers from the short-ground event, the base voltage of transistor Q1 is greater than the short-ground recovery turn-on voltage, and the GPS antenna 5 recovers after the short-ground event. Since the pull-down resistor R5 inside transistor Q1 is close to the base resistor R4, the base current is very small. Therefore, the pull-down resistor R5 needs to be replaced, and the resistance of the replacement pull-down resistor R5 is much larger than that of the base resistor R4. The voltage division effect of the replaced base pull-down resistor R5 in the voltage divider circuit will be weakened, so more voltage will drop between the base and emitter of transistor Q1. At this time, transistor Q1 conducts, and the GPS antenna 5 resumes normal power supply.

[0049] When GPS antenna 5 is open-circuited, such as Figure 3 With both transistor Q1 and MOSFET Q2 conducting, the LDO power supply reaches the second ADC acquisition unit through two loops. One loop involves the LDO power supply passing through resistor R1 to MOSFET Q2, then through a voltage divider formed by two 10K resistors R7 and R8 before reaching the second ADC acquisition unit. The other loop involves passing through resistor R1 to resistors R3 and R6, then through another 10K resistors R7 and R8 before reaching the second ADC acquisition unit. At this point, the first sampling voltage acquired by the first ADC acquisition unit is between 3.85 and 4.502V, and the second sampling voltage acquired by the second ADC acquisition unit is between 1.925 and 2.251V. Calculations show that twice the voltage acquired by the second ADC acquisition unit is equal to the actual supply voltage V1 of GPS antenna 5, which is between 3.85 and 4.502V; the supply voltage V2 of the LDO power supply is also between 3.85 and 4.502V. When the actual power supply voltage V1 of GPS antenna 5 is between 3.85-4.502V and the power supply voltage V2 of LDO power supply is between 3.85-4.502V, and the difference between the power supply voltage V2 of LDO power supply and the actual power supply voltage V1 of GPS antenna 5 is less than or equal to 0.05V, it can be determined that GPS antenna 5 is in an open circuit state.

[0050] After the open circuit of GPS antenna 5 is restored, the LDO power supply supplies power to GPS antenna 5. At this time, transistor Q1 remains in saturation and MOSFET Q2 remains on. GPS antenna 5 is considered to have resumed operation when the following three conditions are met: the actual supply voltage V1 of GPS antenna 5 is between 3.231 and 4.281V; the supply voltage V2 of the LDO power supply is between 3.997 and 4.407V; and the voltage difference between V2 and V1 is greater than 0.12V and less than 0.77V.

[0051] When the GPS antenna 5 is in overcurrent, the triode Q1 and the MOS tube Q2 are in the conducting state, and the power supply is mainly supplied through the first resistor R1 to the MOS tube Q2 and then through the inductor L1. At this time, the first sampling voltage collected by the first ADC collection unit is between 3.85-4.502V, and the second sampling voltage collected by the second ADC collection unit is between 0.094-1.824V. Since the current of the GPS power supply in overcurrent is 52mA-250mA, it can be calculated by resistance voltage division that the actual supply voltage V1 of the GPS antenna 5 is between 0.187-3.64V. The supply voltage V2 of the LDO power supply is between 3.85-4.502V. When judging the overcurrent of the GPS power supply, in addition to the actual supply voltage V1 of the GPS antenna 5 and the supply voltage V2 of the LDO power supply being located in the corresponding voltage range interval respectively, it also needs to satisfy that the difference between the supply voltage V2 of the LDO power supply and the actual supply voltage V1 of the GPS antenna 5 is greater than 0.8V and less than 3.85V. Since the maximum current of the GPS antenna 5 is 50mA, at this time, 2mA is added to the maximum current, in order to distinguish the normal current 50mA and avoid misjudgment. The current of the GPS antenna 5 in overcurrent will maintain for a period of time, if the instantaneous current exceeds the current of the GPS antenna 5 in overcurrent, which is 52mA-250mA, it should not be considered as overcurrent failure.

[0052] When the GPS antenna 5 works normally, referring to Figure 1 , the triode Q1 and the MOS tube Q2 are in the conducting state, and the LDO power supply is mainly supplied through the first resistor R1 to the MOS tube Q2 and then through the inductor L1 to supply the GPS antenna 5, at this time, the second sampling voltage collected by the second ADC collection unit is between 1.568-2.212V. It can be calculated by resistance voltage division that the actual supply voltage V1 of the GPS antenna 5 is between 3.136-4.424V, and the supply voltage V2 of the LDO power supply is between 3.85-4.502V. When judging the normal work of the GPS antenna 5, in addition to satisfying that the actual supply voltage V1 of the GPS antenna 5 and the supply voltage V2 of the LDO power supply are located in the corresponding preset voltage range respectively, it also needs to satisfy that the difference between the supply voltage V2 of the LDO power supply and the actual supply voltage V1 of the GPS antenna 5 is greater than 0.06V and less than 0.771V.

[0053] The circuit in the embodiment adopts high-precision ADC to monitor voltage in real time, and adds another detection of the overcurrent state of the GPS antenna in addition to the normal work, short ground and open circuit state of the GPS antenna. The circuit can also realize the detection of the recovery of the short ground and the open circuit recovery state of the GPS antenna.

[0054] The circuit in the embodiments of the present application adopts common devices, and the prices of the components are cheap, the circuit is simple, and the circuit is suitable for mass production and wide application.

[0055] It should be noted that each of the embodiments in the specification adopts a progressive manner for description, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] It should also be noted that in this paper, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, relationship terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between the entities or operations, and cannot be understood as indicating or implying relative importance. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or terminal device including the element.

[0058] The above describes the technical solutions provided by the present application in detail, and the principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the present application, and the content of the specification should not be understood as a limitation on the present application. At the same time, for those skilled in the art, according to the present application, there will be different forms of changes in specific implementation modes and application ranges, which do not need to be enumerated here, and the obvious changes or changes derived therefrom are still within the protection scope of the present application.

Claims

1. A circuit for diagnosing and protecting a GPS antenna in a vehicle, comprising: a GPS antenna; a GPS receiver; a GPS antenna diagnostic circuit; and a GPS antenna protection circuit. include: power supply; The control module (1) includes a first ADC acquisition unit and a second ADC acquisition unit, wherein the first ADC acquisition unit is electrically connected to the power supply. Voltage conversion module (2), the input terminal of the voltage conversion module (2) is electrically connected to the power supply, and is used to convert the power signal at its input terminal into antenna voltage and output it; The first control switch (3) is electrically connected to the output terminal of the voltage conversion module (2), and the second terminal of the first control switch (3) is connected to a reference signal. The first control switch (3) is used to turn on when the antenna voltage is connected to its control terminal. The second control switch (4) has its first end electrically connected to the output end of the voltage conversion module (2), its control end electrically connected to the first end of the first control switch (3), and its second end electrically connected to the second ADC acquisition unit of the control module (1). The second control switch (4) is used to turn on when the reference signal is connected to its control end. The control terminal of the first control switch (3) and the second terminal of the second control switch (4) are also electrically connected to the GPS antenna (5); The control module (1) determines the working status of the GPS antenna (5) based on the first sampling voltage of the first ADC acquisition unit and the second sampling voltage of the second ADC acquisition unit.

2. The vehicle GPS antenna diagnostic and protection circuit of claim 1, wherein, A pull-down resistor (R5) is connected between the control terminal and the second terminal of the first control switch (3).

3. The vehicle GPS antenna diagnostic and protection circuit of claim 1, wherein, The voltage conversion module (2) is a first resistor (R1), the first end of the first resistor (R1) serves as the input end of the voltage conversion module (2), and the second end of the first resistor (R1) serves as the output end of the voltage conversion module (2).

4. The vehicle GPS antenna diagnostic and protection circuit of claim 1, wherein, The first control switch (3) is a transistor (Q1). The base of the transistor (Q1) serves as the control terminal of the first control switch (3), the collector of the transistor (Q1) serves as the first terminal of the first control switch (3), and the emitter of the transistor (Q1) serves as the second terminal of the first control switch (3).

5. The vehicle GPS antenna diagnostic and protection circuit of claim 4, wherein, The vehicle-mounted GPS antenna diagnostic and protection circuit further includes: a second resistor (R2) and a third resistor (R3). The collector of the transistor (Q1) is electrically connected to the output terminal of the voltage conversion module (2) through the second resistor (R2). The base of the transistor (Q1) is electrically connected to the output terminal of the voltage conversion module (2) through the third resistor (R3). The base of the transistor (Q1) is also electrically connected to the GPS antenna (5) through a sixth resistor (R6).

6. The vehicle GPS antenna diagnostic and protection circuit of claim 1, wherein, The second control switch (4) is a MOS transistor (Q2). The control terminal of the MOS transistor (Q2) is the control terminal of the second control switch (4). The first terminal of the MOS transistor (Q2) is the first terminal of the second control switch (4). The second terminal of the MOS transistor (Q2) is the second terminal of the second control switch (4).

7. The vehicle GPS antenna diagnostic and protection circuit of claim 1, wherein, The vehicle-mounted GPS antenna diagnosis and protection circuit further comprises an inductor (L1), a control end of the first control switch (3), the second end of the second control switch (4) and a second ADC acquisition unit of the control module (1) are electrically connected with the GPS antenna (5) through the inductor (L1).

8. The vehicle GPS antenna diagnostic and protection circuit of claim 1, wherein, The vehicle-mounted GPS antenna diagnosis and protection circuit further comprises a voltage division module (6), the second ADC acquisition unit of the control module (1) is electrically connected with the second end of the second control switch (4) through the voltage division module (6), wherein a first end of the voltage division module (6) is electrically connected with the second end of the second control switch (4), a second end of the voltage division module (6) is grounded, and a voltage division output end of the voltage division module (6) is electrically connected with the second ADC acquisition unit of the control module (1).

9. The vehicle GPS antenna diagnostic and protection circuit of claim 8, wherein, The voltage division module (6) comprises a seventh resistor (R7) and an eighth resistor (R8), a first end of the seventh resistor (R7) is used as the first end of the voltage division module (6), a second end of the seventh resistor (R7) is electrically connected with a first end of the eighth resistor (R8), the second end of the seventh resistor (R7) is used as the voltage division output end of the voltage division module (6), and a second end of the eighth resistor (R8) is used as the second end of the voltage division module (6).

10. A vehicle characterized by comprising: The vehicle-mounted GPS antenna diagnosis and protection circuit comprises the vehicle-mounted GPS antenna diagnosis and protection circuit according to any one of claims 1 to 9.

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