CN114924206A - Antenna detection circuit, vehicle-mounted terminal and vehicle - Google Patents

Antenna detection circuit, vehicle-mounted terminal and vehicle Download PDF

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Publication number
CN114924206A
CN114924206A CN202210319377.8A CN202210319377A CN114924206A CN 114924206 A CN114924206 A CN 114924206A CN 202210319377 A CN202210319377 A CN 202210319377A CN 114924206 A CN114924206 A CN 114924206A
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antenna
resistor
module
voltage
triode
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刘坚
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Hunan Sany Intelligent Control Equipment Co Ltd
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Hunan Sany Intelligent Control Equipment Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/10—Radiation diagrams of antennas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The application relates to the field of vehicle electronic information, in particular to an antenna detection circuit, a vehicle-mounted terminal and an engineering vehicle. The antenna detection circuit comprises a system power supply, a voltage division module, a detection module and a judgment module, wherein the voltage output by the system power supply is divided by the voltage division module, meanwhile, the output voltage of the detection module and the different states of the antenna are used, and the voltage division relations of different types are different, so that the judgment module can judge the open circuit or the short circuit of the antenna and the type of the antenna according to the voltage at the third end of the detection module, the circuit is simple, the cost is lower, the detection function is various, the antenna on-off and short circuit are basically judged, the vehicle use safety is ensured, the type of the antenna can be judged, and the management and the application of the antenna are facilitated.

Description

Antenna detection circuit, vehicle-mounted terminal and vehicle
Technical Field
The application relates to the field of vehicle electronic information, in particular to an antenna detection circuit, a vehicle-mounted terminal and a vehicle.
Background
At present, an antenna is often installed on a vehicle-mounted terminal of a vehicle, the antenna enables functions of GPS navigation, positioning and the like of the vehicle to be normally used, and meanwhile, the vehicle-mounted terminal also has a detection function of the antenna, but an existing antenna detection circuit is high in hardware cost, complex in software logic and single in detection function, and cannot accurately judge the type of the antenna while detecting the state of the antenna, so that a better detection circuit is required.
Disclosure of Invention
In view of this, the application provides an antenna detection circuit, a vehicle-mounted terminal and a vehicle, which solve or improve the technical problems that the antenna detection circuit in the prior art is high in hardware cost, complex in software logic, single in detection function, and incapable of detecting the state of an antenna and simultaneously accurately judging the type of the antenna.
According to a first aspect of the present application, there is provided an antenna detection circuit comprising: a system power supply; the first end of the voltage division module is connected with the output end of the system power supply; the first end of the detection module is connected with the second end of the voltage division module, and the second end of the detection module is connected with an antenna; the input end of the judgment module is connected with the third end of the detection module; the judging module judges the state of the antenna and the type of the antenna according to the voltage of the third end of the detecting module; wherein the states of the antenna include a short circuit state, an open circuit state, and a normal state.
In one possible implementation, the antenna includes a communication antenna including a first radio frequency connector and a second radio frequency connector; wherein the detection module comprises: a first end of the first inductor is connected with the first radio frequency connector, and a second end of the first inductor is connected with the voltage dividing module; the first end of the first resistor is connected with the second end of the first inductor, and the second end of the first resistor is connected with the judging module; wherein, the partial pressure module includes: a first end of the second resistor is connected with the output end of the power supply, and a second end of the second resistor is connected with a second end of the first inductor; and the first end of the third resistor is grounded, and the second end of the third resistor is connected with the second radio frequency connector.
In one possible implementation manner, the antenna detection circuit further includes: and the first end of the damage prevention module is connected with the first end of the second resistor, and the second end of the damage prevention module is connected with the output end of the system power supply.
In one possible implementation, the antenna comprises a GNSS antenna; wherein the detection module comprises: the third end of the first triode is connected with the judging module, and the first end of the first triode is connected with the GNSS antenna; a first end of the fourth resistor is connected with the voltage division module, and a second end of the fourth resistor is connected with a first end of the first triode; and the first end of the fifth resistor is connected with the voltage division module, the second end of the fifth resistor is connected with the judgment module, and the voltage division module is used for dividing the power supply voltage output by the output end of the system power supply so that the first triode works in a saturation region or an amplification region.
In one possible implementation, the voltage dividing module includes: a third end and a second end of the second triode are both connected with the second end of the first triode; a first end of the sixth resistor is grounded, and a second end of the sixth resistor is connected with a third end of the second triode; and a first end of the seventh resistor is connected with the output end of the system power supply, and a second end of the seventh resistor is connected with the first end of the second triode.
In one possible implementation manner, the antenna detection circuit further includes: the first end of the short-circuit protection module is connected with the output end of the system power supply, the second end of the short-circuit protection module is connected with the first end of the voltage division module, and the third end of the short-circuit protection module is connected with the antenna.
In one possible implementation, the short-circuit protection module includes: one end of the output acquisition module is connected with the antenna; a second end of the third triode is connected with the second end of the output acquisition module, and a first end of the third triode is grounded; the first end of the divider resistor is connected with the third end of the third triode, and the second end of the divider resistor is connected with the output end of the system power supply; the first end of the fourth triode is connected with the third end of the voltage division resistor, and the third end of the fourth triode is connected with the first end of the voltage division module; the output acquisition module is used for dividing the voltage of the antenna to enable the third triode to be in a saturation region or a cut-off region; the voltage dividing resistor is used for dividing the voltage of the system power supply, so that the fourth triode is switched on or switched off.
In one possible implementation, the output acquisition module includes: an eighth resistor, a first end of which is connected to the antenna; and the ninth resistor is connected with the eighth resistor in series, the first end of the ninth resistor is connected with the second end of the eighth resistor, and the second end of the ninth resistor is connected with the second end of the third triode.
In one possible implementation, the voltage dividing resistor includes: a tenth resistor; and an eleventh resistor in series with the tenth resistor; the first end of the tenth resistor is connected with the second end of the eleventh resistor, the second end of the tenth resistor is connected with the output end of the system power supply, and the first end of the eleventh resistor is connected with the third end of the third triode.
According to a second aspect of the present application, there is provided a vehicle-mounted terminal including: an antenna; and the antenna detection circuit of any of the above.
According to a third aspect of the present application, there is provided a vehicle comprising: any of the above vehicle-mounted terminals.
The application provides a this kind of antenna detection circuitry, including the system power supply, the partial pressure module, detection module and judgment module, carry out the partial pressure through the voltage of partial pressure module to system power supply output, simultaneously with the help of detection module's output voltage and the different states of antenna, the partial pressure relation of different grade type is different, make the judgment module can judge the switching-on and switching-off circuit of antenna according to the voltage of detection module's third end, the type of short circuit and antenna, not only the circuit is simple, the cost is lower, it is various to detect the function simultaneously, except that judging the antenna switching-on and switching-off basically, guarantee vehicle safety in utilization, can also judge the type of antenna, be convenient for the management and the application of antenna.
Drawings
Fig. 1 is a schematic structural diagram of an antenna detection circuit according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a communication antenna detection circuit in an antenna detection circuit according to an embodiment of the present application.
Fig. 3 is a circuit diagram of a GNSS antenna detection circuit in an antenna detection circuit according to an embodiment of the present application.
Fig. 4 is a circuit diagram of an antenna short-circuit protection circuit in an antenna detection circuit according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a vehicle-mounted terminal according to an embodiment of the present application.
Detailed Description
In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indicators in the embodiments of the present application (such as upper, lower, left, right, front, rear, top, bottom … …) are only used to explain the relative positional relationship between the components, the movement, etc. in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a circuit diagram of an antenna detection circuit according to an embodiment of the present application. As shown in fig. 1, the antenna detection circuit specifically includes a system power VCC, a voltage dividing module 100, a detection module 200, and a determination module 300. The first end of the voltage dividing module 100 is connected to the output end of the system power VCC, and the voltage dividing module 100 divides the voltage output by the output end of the system power VCC; the first end of the detection module 200 is connected with the second end of the voltage division module 100, the second end of the detection module 200 is connected with the antenna 10, and the voltage drop of the detection module 200 is related to the on/off circuit and the short circuit of the antenna 10 and the type of the antenna 10; the input end of the determining module 300 is connected to the third terminal of the detecting module 200, and the determining module 300 determines the state of the antenna 10 and the type of the antenna 10 according to the voltage at the third terminal of the detecting module 200, wherein the state of the antenna 10 includes a normal state, a short-circuit state and a disconnection state, and the type of the antenna refers to that the types of the antennas provided by different suppliers are different, and the supplier providing the antenna can be correspondingly deduced reversely according to the type of the antenna. The antenna detection circuit is low in cost, simple in circuit and high in reliability, can detect the on-off and short circuit of the antenna 10, can detect the type of the antenna 10 and facilitates daily management of the antenna 10.
The application provides this kind of antenna detection circuitry, including system power VCC, divide voltage module 100, detection module 200 and judge module 300, divide voltage that system power VCC exported through divide voltage module 100, simultaneously with the help of detection module 200's output voltage and antenna 10 different states, the partial pressure relation of different grade type is different, make judge module 300 can judge the state of antenna 10 and the type of antenna 10 according to the voltage of the third end of detection module 200, not only the circuit is simple, the cost is lower, it is various to detect the function simultaneously, except that judging antenna 10 opens and shuts basically, the short circuit, guarantee vehicle safety in utilization, can also judge the type of antenna 10, be convenient for antenna 10's management and application.
It should be understood that in order to ensure the safe operation of the circuit, the system power supply VCC is preferably of the VCC-3V3 type, and in general, the voltage thereof is not preferably greater than 5V.
In a possible implementation manner, fig. 2 is a circuit diagram of a 4G antenna detection circuit in an antenna detection circuit according to an embodiment of the present application. As shown in fig. 2, the antenna applied to the antenna detection circuit may be a communication antenna, and specifically may be a 2G antenna, a 4G antenna, a 5G antenna, etc., and the following description will be given by taking the 4G antenna as an example, where the 4G antenna includes a first rf connector H1 and a second rf connector H2, the first rf connector H1 is connected to the detection module 200 of the antenna detection circuit, and the second rf connector H2 is connected to the voltage division module 100 of the antenna detection circuit, so that the antenna detection circuit can detect the on, off, and short circuit of the 4G antenna. Based on the 4G antenna, the detection module 200 of the antenna detection circuit further includes a first inductor L1 and a first resistor R1. A first end of the first inductor L1 is connected to the first rf connector H1, a second end of the first inductor L1 is connected to an output end of the system power VCC, the first inductor L1 may be 56 nanohenries, and the first inductor L1 reduces an influence of an external interference signal on the quality of an rf signal of a 4G antenna rf line; the second terminal of the first resistor R1 is the second terminal of the detection module 200, and the first terminal of the first resistor R1 is connected to the second terminal of the first inductor L1. The voltage divider 100 of the antenna detection circuit includes a second resistor R2 and a third resistor R3. A first end of the second resistor R2 is connected with the output end of the system power supply VCC, and a second end of the second resistor R2 is connected with a second end of the first inductor L1; the first end of the third resistor R3 is grounded, the second end is connected to the second rf connector H2, optionally, the second end of the third resistor R3 may also be connected to a first capacitor C1 for dc blocking, and the third resistor R3 and the second resistor R2 play a role of voltage division in the detection circuit. The first capacitor C1 may be 470 picofarads, and the determining module 300 of the antenna detection circuit may be an analog-to-digital converter ADC of the communication module. In addition, a first end of the second resistor R2 is connected in series with the first transistor D1, a second end of the second resistor R2 is connected to the second capacitor C2 and the third capacitor C3 which are connected in parallel, and the second capacitor C2 and the third capacitor C3 are both grounded, the second capacitor C2 may be 100 nanofarads, and the third capacitor C3 may be 33 picofards.
When the antenna detection circuit is not connected with the 4G antenna, namely the first radio frequency connector H1 is suspended, the direct current circuit of the first inductor L1 is disconnected, the voltage of the system power VCC directly enters the input end of the judgment module 300, and at this time, the judgment module 300 displays that the voltage of the third end of the detection module 200 is about 3.2V-3.3V; when the antenna detection circuit is connected with the 4G antenna, the first rf connector H1 is connected with the second rf connector H2, and the voltage across the first resistor R1, i.e. the voltage at the third terminal of the detection module 200, is a voltage divided by the third resistor R3, so that the voltage value is related to the magnitude of the third resistor R3 and the output voltage of the system power VCC, and is usually about 1.5V-2.1V, that is, when the voltage at the third terminal of the detection module 200 is within the above range, the judgment module 300 can judge that the current 4G antenna is in a connection state; when the 4G antenna is shorted, which is equivalent to the first inductor L1 being shorted to ground, the voltage entering the ADC interface of the ADC through the first resistor R1 is about 0V-0.1V, that is, when the voltage at the third terminal of the detection module 200 is within the above range, it can be determined that the current 4G antenna is in a short-circuit state. The circuit judges whether the current 4G antenna is connected or not and whether the current 4G antenna is short-circuited or not through different voltages at two ends of the first resistor R1 in the detection module 200, and the adopted elements are simple and easy to obtain, the cost is low, meanwhile, the detection result is visual and accurate, and the reliability is high.
Meanwhile, when the 4G antenna is connected, because the third resistor R3 configured for different types of 4G antennas has different sizes, for example, the resistance of the third resistor R3 of the supplier a is 10K ohms, the voltage entering the ADC interface of the analog-to-digital converter through the first resistor R1 is about 1.5V to 1.6V, and the resistance of the third resistor R3 of the supplier B is 20K ohms, so the voltage entering the ADC interface of the analog-to-digital converter through the first resistor R1 is about 2.0V to 2.1V. Similarly, when the resistance of the third resistor R3 is known, the voltage at the third end of the detection module 200 during the 4G antenna access can be calculated, so as to determine the current information such as the type or supplier of the 4G antenna, which is convenient for different management according to different types of antennas, and is more convenient.
Specifically, as shown in fig. 2, the second end of the first inductor L1 is further connected to the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected to a twelfth resistor R12, the twelfth resistor R12 may be a 0-ohm resistor, and the 4G antenna detection circuit further includes a spare capacitor C5 and a spare capacitor C6. The second terminal of the second resistor R2 is further connected to the first terminal of the seventh capacitor C7, the second terminal of the seventh capacitor C7 is grounded, and the seventh capacitor C7 may be 100 nanofarads.
Optionally, as shown in fig. 2, the antenna detection circuit may further include a damage prevention module 400, where a first end of the damage prevention module 400 is connected to a second end of the first inductor L1, and a second end of the damage prevention module 400 is connected to an output end of the system power VCC, and the damage prevention module 400 may be used to reduce the possibility of reverse voltage reverse damage to the circuit.
Specifically, as shown in fig. 2, the damage prevention module 400 may specifically include a first transistor D1, which plays a role of reverse protection for the detection circuit by using characteristics of the transistor, so as to reduce the probability of an accident occurring in the mis-connection circuit.
In a possible implementation manner, fig. 3 is a circuit diagram of a GNSS antenna detection circuit in an antenna detection circuit according to an embodiment of the present application. As shown in fig. 3, the antenna applied by the antenna detection circuit may also be a GNSS antenna. When the antenna detection circuit is applied to the detection of the GNSS antenna, the detection module 200 of the circuit may include a first transistor Q1, a fourth resistor R4, and a fifth resistor R5. The first triode Q1 may be SST3906, the third terminal of the first triode Q1 is the third terminal of the detection module 200, the first terminal of the first triode Q1 is connected to the GNSS antenna, the second terminal of the first triode Q1 is connected to the voltage divider module 100, and an eighth capacitor C8 and a second inductor L2, one end of which is grounded, are further connected between the GNSS antenna and the first terminal of the first triode Q1; the fourth resistor R4 is connected with the first end of the first triode Q1; the fifth resistor R5 is connected to the third terminal of the first transistor Q1. Meanwhile, the voltage dividing module 100 is configured to divide the power voltage output by the output terminal of the system power VCC, so that the first transistor Q1 operates in a saturation region or an amplification region.
When the GNSS antenna is turned off, the voltage division module 100 divides the power supply voltage, so that the first transistor Q1 operates in a saturation region; when the GNSS antenna is normally connected, the voltage division module 100 divides the power supply voltage so that the first transistor Q1 operates in the amplification region; when the GNSS antenna is short circuited, the current does not pass through the first transistor Q1. As can be seen from the above, the different connection states of the GNSS antenna and the detection module 200 cause the voltages at the two ends of the first transistor Q1 to be different, and then the determining module 300 determines the current connection state of the GNSS according to the different voltages at the third end of the detection module 200, thereby implementing the detection function of the antenna. The determining module 300 may include a thirteenth resistor R13 and an ADC, wherein a first end of the thirteenth resistor R13 is connected to a third end of the first transistor Q1, and a second end of the thirteenth resistor R13 is connected to the ADC. In addition, different active low noise amplification devices are adopted by different suppliers, and the currents extracted by the antenna detection circuit are different due to the different active low noise amplification devices, so that when the GNSS antenna is normally connected, the type of the currently adopted GNSS antenna can be judged according to the interval where the voltage value of the third terminal of the detection module 200 is located, and differential management and application can be conveniently performed on different types of antennas.
Specifically, as shown in fig. 3, when the antenna detection circuit is applied to the detection of the GNSS antenna, the voltage divider 100 of the circuit may further include a second transistor Q2, a sixth resistor R6, and a seventh resistor R7. The selectable type of the second triode Q2 is SST3906, and the third end and the second end of the second triode Q3578 are both connected with the second end of the first triode Q1; a first end of the sixth resistor R6 is grounded, and a second end of the sixth resistor R6 is connected with a third end of the second triode Q2; the first end of the seventh resistor R7 is connected to the output terminal of the system power VCC, the first end of the seventh resistor R7 is further connected in parallel to a ninth capacitor C9, and the second end of the seventh resistor R7 is connected to the first end of the second transistor Q2.
When the GNSS antenna is not connected, the GNSS antenna port is floating, the voltage at the second terminal of the second transistor Q2 is divided by the diode voltage drop of the seventh resistor R7 and the second transistor Q2 (it can be known from the reference that the voltage drop between the base and the emitter of the transistor with the model SST3906 is 0.64VDC) and the sixth resistor R6, it can be calculated that the voltage at the second terminal of the second transistor Q2 is 2.633V, the voltage at the first terminal of the first transistor Q1 is 3.3VDC, the voltage at the first terminal of the first transistor Q1 is 0.667VDC (i.e., the voltage at the first terminal of the first transistor Q1 is 3.3V minus the voltage 2.633V at the second terminal of the second transistor Q2), which is greater than the turn-on voltage of the first transistor Q1 by 0.64V, at this time, the first transistor Q1 can be turned on, and when the GNSS antenna operates in a saturation region, the voltage drop at the first terminal of the first transistor Q35 1 is 0.3V, at this time, the voltage drop of the third terminal of the third transistor Q1 is about 3V, i.e. the voltage at the third terminal of the detection module 200 is 3.3V. Therefore, when the determining module 300 determines that the voltage at the third terminal of the detecting module 200 is about 3.3V, such as 3.2V to 3.3V, it can be determined that the GNSS antenna is currently in the off state.
When the GNSS antenna is short-circuited, the voltage of the GNSS antenna port is 0V, and the voltage of the third terminal of the detection module 200 is also about 0V at this time, that is, when the determination module 300 determines that the voltage of the third terminal of the detection module 200 is about 0V, such as 0V to 0.06V, it may be determined that the current GNSS antenna is in a short-circuited state.
When the GNSS antenna is normally connected, the currents of the circuits in which the GNSS antenna is located are different due to different active low noise amplification devices adopted by different suppliers, and the currents drawn by the antenna detection circuit from the GNSS antenna circuits are also different. For example, when the GNSS antenna provided by the provider a is used, the voltage of the GNSS antenna is 3.193V, the voltage from the first terminal of the first transistor Q1 to the second terminal thereof is 0.56VDC (i.e., the voltage of the GNSS antenna is 3.193V minus the voltage of the second terminal of the second transistor Q2 is 2.633V), and is less than the turn-on voltage of the first transistor Q1, at this time, the first transistor Q1 operates in an amplification region, and as can be seen from a review of the manual, the impedance from the first terminal of the first transistor Q1 to the third terminal thereof is 7.8K ohms, and at this time, the voltage from the second terminal of the first transistor Q1 is about 1.2V. Therefore, when the determining module 300 determines that the voltage at the third terminal of the detecting module 200 is about 1.2V, it can be determined that the current GNSS antenna is in a normal connection state, and the type of the GNSS antenna used by the circuit is the GNSS antenna provided by the provider a.
For another example, when the GNSS antenna provided by the provider B is used, the voltage of the GNSS antenna is 3.177V, the voltage from the first terminal of the first transistor Q1 to the second terminal thereof is 0.56VDC (i.e., the voltage 3.177V of the GNSS antenna subtracts 2.633V of the second terminal of the second transistor Q2), which is smaller than the turn-on voltage of the first transistor Q1, the first transistor Q1 operates in an amplification region, and it can be known from a manual that the impedance of the first terminal of the first transistor Q1 to the third terminal thereof is 10K ohms, and at this time, the voltage of the second terminal of the first transistor Q1 is about 1.02V. Therefore, when the determining module 300 determines that the voltage at the third terminal of the detecting module 200 is about 1.02V, it can be determined that the current GNSS antenna is in a normal connection state, and the type of the GNSS antenna used by the circuit is the GNSS antenna provided by the provider B.
In a similar manner, in the above determination process, the GNSS antennas of different types can obtain the corresponding preset voltage value by pre-calculating the voltage, so as to determine whether the GNSS antennas are connected or not and whether the GNSS antennas are short-circuited according to the different voltages at the third end of the detection module 200, and the types of the GNSS antennas, so that not only the determination result is intuitive and accurate, but also the component cost is low.
Optionally, fig. 4 is a circuit diagram of a short-circuit protection circuit in an antenna detection circuit according to an embodiment of the present application. As shown in fig. 3 and 4, the antenna detection circuit may further include a short-circuit protection module 500 for performing circuit protection, wherein the short-circuit protection module is suitable for both circuits including communication antennas and GNSS antennas, and the GNSS antennas are taken as an example for description below. The second terminal of the short-circuit protection module 500 is connected to the second terminal of the voltage divider module 100, and the third terminal of the short-circuit protection module 500 is connected to the GNSS antenna. The short-circuit protection module 500 is used for circuit protection when the GNSS antenna is short-circuited, so that the power supply is protected, and the use safety of the circuit is improved.
In one possible implementation manner, as shown in fig. 4, the short-circuit protection module 500 further includes an output acquisition module 510, a third transistor Q3, a voltage dividing resistor 520, and a fourth transistor Q4. One end of the output acquisition module 510 is connected to the GNSS antenna, the output acquisition module 510 is configured to divide the voltage of the GNSS antenna, so that the third transistor Q3 is in a saturation region or a cut-off region, the output acquisition module 510 may include an eighth resistor R8 and a ninth resistor R9 that are connected in series, where a first end of the eighth resistor R8 is connected to the GNSS antenna, a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9, and a second end of the ninth resistor R9 is connected to a second end of the third transistor Q3; the model of the third triode Q3 can be selected as SST3904, the second end of the third triode Q3 is connected with the second end of the output acquisition module 510, and the first end of the third triode Q3 is grounded; the first end of the voltage dividing resistor 520 is connected to the third end of the third triode Q3, the second end of the voltage dividing resistor 520 is connected to the output end of the system power VCC, the voltage dividing resistor 520 is configured to divide the voltage of the system power VCC, so that the fourth triode Q4 is turned on or turned off, the voltage dividing resistor 520 may specifically include a tenth resistor R10 and an eleventh resistor R11 that are connected in series with each other, wherein the first end of the tenth resistor R10 is connected to the second end of the eleventh resistor R11, the first end of the eleventh resistor R11 is the first end of the voltage dividing resistor 520, that is, the first end of the eleventh resistor R11 is connected to the third end of the third triode Q3, and the second end of the tenth resistor R10 is the second end of the voltage dividing resistor 520, that is, the second end of the tenth resistor R10 is connected to the output end of the system power VCC; a first terminal of the fourth transistor Q4 is connected to a second terminal of the tenth resistor R10, and a third terminal of the fourth transistor Q4 is connected to a first terminal of the seventh resistor R7. The output end of the system power VCC is connected to the first end of the fourteenth resistor R14 of 0 ohm, the second end of the fourteenth resistor R14 of 0 ohm is connected to the second end of the fourth triode Q4, the power voltage of the system power VCC is output to the third end of the fourth triode Q4 through the second end of the fourth triode Q4, and is finally output to the first end of the voltage divider module 100, that is, the detection power VCC _ GNSS of the GNSS in fig. 4, and the system power VCC end in fig. 3.
When the GNSS antenna is normally connected, after the power voltage output by the antenna power VCC _ RF passes through the output acquisition module 510, the third transistor Q3 is operated in a saturation region, at this time, the impedance of the third terminal of the third transistor Q3 to the first terminal thereof is 0 ohm, at this time, the eleventh resistor R11 is equivalent to ground, the voltage of the tenth resistor R10 is the voltage obtained by dividing the voltage by the tenth resistor R10 and the eleventh resistor R11, since the eleventh resistor R11 is equivalent to ground at this time, the voltage of the tenth resistor R10 is 3.3V, at this time, the voltage of the fourth transistor Q4 is-3.3V, that is, the PMOS transistor VGS (pin 2 to pin 1) is-3.3V, and the second terminal to the third terminal thereof are in a conduction state.
When the GNSS antenna is short-circuited, the voltage of the GNSS antenna is 0V at this time, the eighth resistor R8 and the eleventh resistor R11 make the third transistor Q3 work in the cut-off region, the impedance of the third terminal of the third transistor Q3 to the first terminal thereof is 5M ohm, the impedance of the eleventh resistor R11 to the ground is 5M ohm, the voltage of the tenth resistor R10 is divided by the impedance of the eleventh resistor R11 and the impedance of the third terminal of the third transistor Q3 to the first terminal thereof, and is approximately equal to 0V, that is, the PMOS transistor VGS (pin 1 in pin 2) is 0V, the second terminal of the fourth transistor Q4 to the third terminal thereof is in the cut-off state, so that the function of protecting the power supply is achieved, the second transistor Q3 will not be turned back on until the short-circuited state of the GNSS antenna is over, and the probability of power supply damage occurring when the GNSS antenna is short-circuited is reduced.
It should be understood that the fourth transistor Q4 provided in the above embodiments is preferably a PMOS transistor, which is relatively low in cost, but may be replaced by an NMOS transistor if necessary, and the specific implementation elements should depend on the specific implementation scenario, and the application does not further limit the specific types of elements of the fourth transistor Q4. The eighth resistor R8 and the ninth resistor R9 provided in the above embodiments may be resistors with the same resistance value or resistors with different resistance values, and the specific resistance values should be determined according to the specific application scenario.
Specifically, as shown in fig. 4, a fifteenth resistor R15 is connected in parallel to a second end of the tenth resistor R10, a first end of the fifteenth resistor R15 is connected in parallel to the tenth resistor R10, and a second end of the fifteenth resistor R15 is connected to the ninth resistor R9.
An embodiment of the present application further provides a vehicle-mounted terminal, and fig. 5 is a schematic structural diagram of the vehicle-mounted terminal provided in the embodiment of the present application. As shown in fig. 5, the vehicle-mounted terminal specifically includes an antenna and the antenna detection circuit provided in any of the above embodiments.
Specifically, as shown in fig. 5, the antenna 10 included in the vehicle-mounted terminal may be one or both of a GNSS antenna and a communication antenna.
This kind of vehicle mounted terminal that this application provided is owing to included above-mentioned antenna detection circuitry, this antenna detection circuitry includes system power VCC, voltage division module 100, detection module 200 and judging module 300, make this vehicle mounted terminal can divide voltage of system power VCC output through voltage division module 100, simultaneously with the help of detection module 200's output voltage and antenna 10 different states, the partial pressure relation of different grade type is different, make judging module 300 can judge the break-make of antenna 10 and the type of antenna 10 according to the voltage of detection module 200's third end, not only the circuit is simple, the cost is lower, it is various to detect the function simultaneously, except judging the antenna break-make basically, guarantee vehicle safety in utilization, can also judge the type of antenna 10, be convenient for antenna 10's management and application.
In a possible implementation manner, as shown in fig. 5, the vehicle-mounted terminal may further include a communication module 600, and the communication module 600 further includes an analog-to-digital converter ADC, where the determination module 300 in the antenna detection circuit is the analog-to-digital converter ADC, and the analog-to-digital converter ADC of the communication module 600 is used to detect and output the voltage at the third terminal of the detection module 200, so that the detection result is more intuitive and reliable.
In addition, the embodiment of the application also provides a vehicle, and the vehicle comprises the vehicle-mounted terminal in the embodiment.
This kind of vehicle that this application provided is owing to included above-mentioned vehicle mounted terminal, owing to this vehicle mounted terminal has included above-mentioned antenna detection circuit, this antenna detection circuit includes system power VCC, voltage division module 100, detection module 200 and judging module 300, make this vehicle mounted terminal can carry out the partial pressure to the voltage of system power VCC output through voltage division module 100, simultaneously with the help of detection module 200's output voltage and the different states of antenna, the partial pressure relation of different grade type is different, make judging module 300 can judge the break-make of antenna and the type of antenna according to the voltage of detection module 200's third end, not only the circuit is simple, the cost is lower, it is various to detect the function simultaneously, except judging the break-make of antenna basically, guarantee vehicle safety in utilization, can also judge the type of antenna, be convenient for antenna's management and application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (11)

1. An antenna detection circuit, comprising:
a system power supply;
the voltage division module (100), wherein a first end of the voltage division module (100) is connected with an output end of the system power supply;
a first end of the detection module (200) is connected with a second end of the voltage division module (100), and a second end of the detection module (200) is connected with an antenna; and
the input end of the judgment module (300) is connected with the third end of the detection module (200);
the judging module (300) judges the state of the antenna and the type of the antenna according to the voltage of the third end of the detecting module (200);
wherein the states of the antenna include a short circuit state, an open circuit state, and a normal state.
2. The antenna detection circuit of claim 1, wherein the antenna comprises a communication antenna comprising a first radio frequency connector and a second radio frequency connector;
wherein the detection module (200) comprises:
a first inductor, wherein a first end of the first inductor is connected with the first radio frequency connector, and a second end of the first inductor is connected with the voltage division module (100); and
a first end of the first resistor is connected with a second end of the first inductor, and a second end of the first resistor is connected with the judging module (300);
wherein the voltage division module (100) comprises:
a first end of the second resistor is connected with an output end of the system power supply, and a second end of the second resistor is connected with a second end of the first inductor;
and the first end of the third resistor is grounded, and the second end of the third resistor is connected with the second radio frequency connector.
3. The antenna detection circuit of claim 2, further comprising:
loss prevention module (400), the first end of loss prevention module (400) with the first end of second resistance is connected, the second end of loss prevention module (400) with the output of system's power is connected.
4. The antenna detection circuit of claim 1, wherein the antenna comprises a GNSS antenna;
wherein the detection module (200) comprises:
the third end of the first triode is connected with the judging module (300), and the first end of the first triode is connected with the GNSS antenna;
a first end of the fourth resistor is connected with the voltage division module (100), and a second end of the fourth resistor is connected with a first end of the first triode; and
a first end of the fifth resistor is connected with the voltage division module (100), and a second end of the fifth resistor is connected with the judgment module (300);
the voltage division module (100) is used for dividing the power supply voltage output by the output end of the system power supply so that the first triode works in a saturation region or an amplification region.
5. The antenna detection circuit according to claim 4, characterized in that the voltage division module (100) comprises:
the third end and the second end of the second triode are both connected with the second end of the first triode;
a first end of the sixth resistor is grounded, and a second end of the sixth resistor is connected with a third end of the second triode; and
and a first end of the seventh resistor is connected with the output end of the system power supply, and a second end of the seventh resistor is connected with the first end of the second triode.
6. The antenna detection circuit of claim 1, further comprising:
the first end of the short-circuit protection module (500) is connected with the output end of the system power supply, the second end of the short-circuit protection module (500) is connected with the first end of the voltage division module (100), and the third end of the short-circuit protection module (500) is connected with the antenna.
7. The antenna detection circuit according to claim 6, characterized in that the short-circuit protection module (500) comprises:
an output acquisition module (510), wherein one end of the output acquisition module (510) is connected with the antenna;
a second end of the third triode is connected with the second end of the output acquisition module (510), and a first end of the third triode is grounded;
a divider resistor (520), wherein a first end of the divider resistor (520) is connected with a third end of the third triode, and a second end of the divider resistor (520) is connected with an output end of the system power supply; and
a first end of the fourth triode is connected with a third end of the voltage division resistor (520), and a third end of the fourth triode is connected with a first end of the voltage division module (100);
the output acquisition module (510) is configured to divide the voltage of the antenna so that the third triode is in a saturation region or a cut-off region; the voltage dividing resistor (520) is used for dividing the voltage of the system power supply, so that the fourth triode is switched on or switched off.
8. The antenna detection module (200) of claim 7, wherein the output acquisition module (510) comprises:
the first end of the eighth resistor is connected with the antenna; and
and the first end of the ninth resistor is connected with the second end of the eighth resistor, and the second end of the ninth resistor is connected with the second end of the third triode.
9. The antenna detection module (200) of claim 7, wherein the voltage divider resistor (520) comprises:
a tenth resistor; and
an eleventh resistor in series with the tenth resistor;
the first end of the tenth resistor is connected with the second end of the eleventh resistor, the second end of the tenth resistor is connected with the output end of the system power supply, and the first end of the eleventh resistor is connected with the third end of the third triode.
10. A vehicle-mounted terminal characterized by comprising:
an antenna; and
the antenna detection circuit of any one of claims 1-9.
11. A vehicle characterized by comprising the in-vehicle terminal of claim 10.
CN202210319377.8A 2022-03-29 2022-03-29 Antenna detection circuit, vehicle-mounted terminal and vehicle Pending CN114924206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210319377.8A CN114924206A (en) 2022-03-29 2022-03-29 Antenna detection circuit, vehicle-mounted terminal and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210319377.8A CN114924206A (en) 2022-03-29 2022-03-29 Antenna detection circuit, vehicle-mounted terminal and vehicle

Publications (1)

Publication Number Publication Date
CN114924206A true CN114924206A (en) 2022-08-19

Family

ID=82805395

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210319377.8A Pending CN114924206A (en) 2022-03-29 2022-03-29 Antenna detection circuit, vehicle-mounted terminal and vehicle

Country Status (1)

Country Link
CN (1) CN114924206A (en)

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