Antenna state detection circuit and electronic equipment

Abstract

The utility model relates to an antenna state detection circuit and electronic equipment, the antenna state detection circuit comprises a sampling unit and a first diode, the negative electrodes of an antenna unit, the sampling unit and the first diode are communicated pairwise, and the positive electrode of the first diode is connected with a power supply; the sampling unit is used for acquiring measurement voltage; the short circuit protection unit is arranged between the antenna unit and the negative electrode of the first diode and between the sampling unit and the negative electrode of the first diode; the short-circuit protection unit comprises a first path and a second path, the first path is provided with a first resistor, and the second path is provided with a first switch assembly; the antenna unit is in a grounding state and an external power supply connection state, the first switch assembly is disconnected, the antenna unit is in an open circuit state and a working state, and the first switch assembly is connected. Based on the scheme, the state of the antenna unit can be determined in a relatively high-efficiency and relatively accurate manner.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to an antenna status detection circuit and electronic device. Background Technology

[0002] With the popularization of intelligent connected vehicles, autonomous driving technology based on high-precision maps is becoming more and more mature. The accuracy of positioning depends not only on the chip's signal processing, but also on the antenna performance and antenna status.

[0003] Currently, most devices cannot diagnose the antenna status in real time. Because antenna failures are not detected in time, vehicle navigation may fail or remote location queries may not be available, thus affecting the user experience. For vehicles that rely on high-precision maps to achieve autonomous driving, this may even lead to traffic accidents or personal injury in serious cases. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides an antenna state detection circuit and electronic device.

[0005] In a first aspect, this application provides an antenna state detection circuit, including:

[0006] The sampling unit and the first diode are connected in pairs, and the antenna unit and the negative terminal of the sampling unit and the first diode are connected to the power supply. The sampling unit is used to acquire the measurement voltage.

[0007] A short-circuit protection unit is disposed between the antenna unit and the negative terminal of the first diode, and between the sampling unit and the negative terminal of the first diode; the short-circuit protection unit includes a first path and a second path, the first path is provided with a first resistor, and the second path is provided with a first switching component; when the antenna unit is in a grounded state and a state connected to an external power supply, the first switching component is open; when the antenna unit is in an open-circuit state and a working state, the first switching component is on.

[0008] Optionally, the short-circuit protection unit further includes an NPN transistor, a second resistor, and a first diode; the first switching assembly includes a P-type MOSFET.

[0009] The source of the P-type MOS transistor, the first terminal of the first resistor, and the negative terminal of the first diode are connected in pairs. The drain of the P-type MOS transistor, the second terminal of the first resistor, the antenna unit, and the sampling unit are connected in pairs. The base of the NPN transistor is connected to the second terminal of the first resistor. The collector of the NPN transistor is connected to the first terminal of the second resistor. The emitter of the NPN transistor is grounded. The second terminal of the second resistor is connected to the gate of the P-type MOS transistor. The positive terminal of the first diode is connected to the power supply.

[0010] Optionally, the sampling unit includes a third resistor, a fourth resistor, and a detection component;

[0011] The first end of the third resistor and the antenna unit of the short-circuit protection unit are connected in pairs. The second end of the third resistor is connected to the first end of the fourth resistor. The second end of the fourth resistor is grounded. The detection component is connected between the second end of the third resistor and the first end of the fourth resistor.

[0012] Optionally, it also includes a first capacitor;

[0013] The first terminal of the first capacitor is connected between the detection component and the second terminal of the third resistor, and between the detection component and the first terminal of the fourth resistor, and the second terminal of the first capacitor is grounded.

[0014] Optionally, it may also include a first inductor;

[0015] The first inductor is connected between the antenna unit and the short-circuit protection unit, and also between the antenna unit and the sampling unit.

[0016] Optionally, it also includes a bidirectional breakdown diode;

[0017] The first end of the bidirectional breakdown diode is connected between the antenna unit and the short-circuit protection unit, and between the antenna unit and the sampling unit, and the second end of the bidirectional breakdown diode is grounded.

[0018] Optionally, a fifth resistor may also be included;

[0019] The fifth resistor is connected between the short-circuit protection unit and the negative terminal of the first diode.

[0020] Optionally, a second capacitor may also be included;

[0021] The first terminal of the second capacitor, the first terminal of the first resistor, and the source of the P-type MOS transistor are connected in pairs, and the second terminal of the second capacitor is connected between the second terminal of the second resistor and the gate of the P-type MOS transistor.

[0022] Optionally, a filtering component may also be included;

[0023] The first end of the filter component is connected between the short-circuit protection unit and the power supply.

[0024] Secondly, this application also provides an electronic device, including an antenna state detection circuit as described in any of the first aspects.

[0025] This application provides an antenna state detection circuit and electronic device. The antenna state detection circuit includes: a sampling unit and a first diode. The antenna unit, the sampling unit, and the negative terminal of the first diode are connected in pairs, and the positive terminal of the first diode is connected to a power supply. The sampling unit is used to acquire a measurement voltage. A short-circuit protection unit is disposed between the antenna unit and the negative terminal of the first diode, and between the sampling unit and the negative terminal of the first diode. The short-circuit protection unit includes a first path and a second path. The first path is provided with a first resistor, and the second path is provided with a first switching component. When the antenna unit is in a grounded state and connected to an external power supply, the first switching component is open. When the antenna unit is in an open-circuit state and in a working state, the first switching component is turned on. Based on the above scheme, this application can determine whether the antenna unit is in a normal working state by the sampling unit based on the detected measurement voltage. Since the switching mode of the first switching component is different when the antenna unit is in a grounded state and connected to an external power supply compared to when the antenna unit is in an open-circuit state and in a working state, the corresponding current transmission paths are also different. Therefore, the sampling unit can detect different measurement voltages and then determine whether the antenna unit is in a grounded state, connected to an external power supply, or in an open-circuit state or a normal working state based on the different measurement voltages. In summary, this application can determine the state of antenna elements in a more efficient and accurate manner. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an antenna state detection circuit structure provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0033] The antenna state detection circuit and electronic device provided in this application are described below with reference to the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of an antenna state detection circuit structure provided in an embodiment of this application. Figure 1 As shown, the antenna state detection circuit includes:

[0035] The sampling unit 100 and the first diode 201 are connected in pairs. The negative terminals of the antenna unit 200, the sampling unit 100, and the first diode 201 are connected to each other. The positive terminal of the first diode 201 is connected to the power supply 300. The sampling unit 100 is used to acquire the measurement voltage.

[0036] A short-circuit protection unit 400 is disposed between the antenna unit 200 and the negative terminal of the first diode 201, and also between the sampling unit 100 and the negative terminal of the first diode 201. The short-circuit protection unit 400 includes a first path and a second path. The first path includes a first resistor 401, and the second path includes a first switching assembly 402. When the antenna unit 200 is in a grounded state and connected to an external power supply state, the first switching assembly 402 is open. When the antenna unit 200 is in an open-circuit state and an operating state, the first switching assembly 402 is on.

[0037] Specifically, the output voltage of the power supply 300 can be 5V. The antenna unit 200 represents a functional unit capable of transmitting and receiving positioning signals. In addition to being connected to the short-circuit protection unit 400, the antenna unit 200 is also connected to a control component 700, such as a controller in a vehicle. Figure 1The diagram illustrates the location and connection method of the control component 700. The sampling unit 100 represents a functional unit capable of acquiring a measurement voltage, which may include, for example, an MCU (Microcontroller Unit) and related components. The short-circuit protection unit 400 is used to implement different current flow paths under different antenna states. Because the current flow paths in the circuit are different under different states, the measurement voltage acquired by the sampling unit 100 is also different, thus the antenna state can be determined based on the acquired measurement voltage.

[0038] When antenna element 200 is in an open-circuit state, it means that antenna element 200 is disconnected from the circuit. At this time, the first switching component 402 is turned on, and the current in the circuit flows through the following path: power supply 300 → first diode 201 → first switching component 402 → sampling unit 100. In this state, the voltage measured by sampling unit 100 can be V0-Vref, where V0 is the output voltage of power supply 300 and Vref is the forward voltage drop of first diode 201.

[0039] When antenna element 200 is in a grounded state, it indicates that antenna element 200 is short-circuited to ground. At this time, the first switch assembly 402 is open, and the current in the circuit flows through the following path: power supply 300 → first diode 201 → first resistor 401 → antenna element 200 (GND). In this state, the voltage measured by sampling unit 100 can be 0.

[0040] The antenna unit 200 being in the external power supply connection state indicates that the antenna unit 200 is short-circuited and connected to another external power source that is not used to power the antenna unit 200. This may damage the antenna unit 200. In this state, the first switching assembly 402 is disconnected, and the current in the circuit flows through the path of antenna unit 200 (external power supply) → sampling unit 100. In this state, the voltage measured by the sampling unit 100 can be the output voltage of the external power supply (the output voltage of the external power supply is different from the output voltage of the power supply 300).

[0041] The antenna unit 200 being in working condition indicates that the circuit has not experienced any faults and is in normal working condition. At this time, the first switching component 402 is turned on, and the current flow path in the circuit is as follows: ① Power supply 300 → First diode 201 → First switching component 402 → Sampling unit 100; ② Power supply 300 → First switching component 402 → Antenna unit 200. That is, in this state, both the sampling unit 100 and the antenna unit 200 are powered by the power supply 300. In this state, the voltage measured by the sampling unit 100 can be V0-Vref.

[0042] In summary, the embodiments of this application can determine whether the antenna unit 200 is in a normal operating state based on the detected measurement voltage by the sampling unit 100. Since the switching mode of the first switching component 402 differs between the antenna unit 200 in a grounded state and a state connected to an external power supply, and between the antenna unit 200 in an open-circuit state and a working state, the corresponding current transmission paths are also different. Therefore, the sampling unit 100 can detect different measurement voltages and then determine whether the antenna unit 200 is in a grounded state, a state connected to an external power supply, an open-circuit state, or a normal operating state based on these different measurement voltages. In conclusion, this application can determine the state of the antenna unit 200 in a relatively efficient and accurate manner.

[0043] Figure 2 This is a schematic diagram of another antenna status detection circuit structure provided in an embodiment of this application. In some embodiments, the short-circuit protection unit 400 further includes an NPN transistor 403 and a second resistor 404. The first switching assembly 402 includes a P-type MOSFET 4021.

[0044] The source of the P-type MOSFET 4021, the first terminal of the first resistor 401, and the cathode of the first diode 201 are connected in pairs. The drain of the P-type MOSFET 4021, the second terminal of the first resistor 401, the antenna unit 200, and the sampling unit 100 are connected in pairs. The base of the NPN transistor 403 is connected to the second terminal of the first resistor 401. The collector of the NPN transistor 403 is connected to the first terminal of the second resistor 404. The emitter of the NPN transistor 403 is grounded. The second terminal of the second resistor 404 is connected to the gate of the P-type MOSFET 4021. The anode of the first diode 201 is connected to the power supply 300.

[0045] like Figure 2 As shown, the P-type MOSFET 4021 is turned on when its gate is at a low potential. When the NPN transistor 403 is turned on, its emitter is grounded, and the gate of the P-type MOSFET 4021 is at a low potential, thus turning the P-type MOSFET 4021 on.

[0046] When antenna element 200 is grounded, the base of NPN transistor 403 is at a low level, therefore NPN transistor 403 cannot conduct. The gate of P-type MOSFET 4021 cannot be grounded, and the gate is at a high level, so P-type MOSFET 4021 cannot conduct. The current flow path in the circuit is as follows: Figure 1 The corresponding implementation examples will not be described in detail here.

[0047] When antenna element 200 is in the off state, the base of NPN transistor 403 is at a high level, so NPN transistor 403 is turned on. The gate of P-type MOSFET 4021 is grounded, and the gate is at a low level, so P-type MOSFET 4021 is turned on. The current flow path in the circuit is as follows: Figure 1 The corresponding implementation examples will not be described in detail here.

[0048] When antenna unit 200 is in operation, the base of NPN transistor 403 is at a high level, so NPN transistor 403 is turned on. The gate of P-type MOSFET 4021 is grounded, so the gate is at a low level, and P-type MOSFET 4021 is turned on. However, due to the presence of the first diode 201, the power supply 300 is protected, preventing current from flowing back into the power supply 300. The current flow path in the circuit is shown in the figure. Figure 1 The corresponding implementation examples will not be described in detail here.

[0049] When antenna element 200 is in operation, the base of NPN transistor 403 is at a high level, therefore NPN transistor 403 is turned on. The gate of P-type MOSFET 4021 is grounded, and the gate is at a low level, therefore P-type MOSFET 4021 is turned on. The current flow path in the circuit is as follows: Figure 1 The corresponding implementation examples will not be described in detail here.

[0050] Figure 3 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application. In some embodiments, the sampling unit 100 includes a third resistor 101, a fourth resistor 102, and a detection component 103.

[0051] The first end of the third resistor 101, the short-circuit protection unit 400, and the antenna unit 200 are connected in pairs. The second end of the third resistor 101 is connected to the first end of the fourth resistor 102. The second end of the fourth resistor 102 is grounded. The detection component 103 is connected between the second end of the third resistor 101 and the first end of the fourth resistor 102.

[0052] like Figure 3 As shown, the detection component 103 can be a functional component capable of detecting voltage, such as an MCU. In this structure, the measured voltage detected by the detection component 103 is the voltage divider of the third resistor 101. Figure 3 Under the given structure, the current flow paths under different antenna states are as follows:

[0053] The antenna unit 200 is in an open circuit state. The current in the circuit flows through the following path: power supply 300 → first diode 201 → first switch assembly 402 → third resistor 101 → fourth resistor 102 → GND.

[0054] Antenna element 200 is in a grounded state, and the current in the circuit flows through the following path: power supply 300 → first diode 201 → first resistor 401 → antenna element 200 (GND).

[0055] When the antenna unit 200 is connected to an external power source, the current in the circuit flows through the following path: antenna unit 200 (external power source) → third resistor 101 → fourth resistor 102 → GND.

[0056] When the antenna unit 200 is in operation, the current flow path in the circuit is as follows: ① Power supply 300 → First diode 201 → First switch assembly 402 → Third resistor 101 → Fourth resistor 102 → GND; ② Power supply 300 → First diode 201 → First switch assembly 402 → Antenna unit 200.

[0057] Continue reading Figure 3 In some embodiments, a first capacitor 501 is also included.

[0058] The first terminal of the first capacitor 501 is connected between the detection component 103 and the second terminal of the third resistor 101, and between the detection component 103 and the first terminal of the fourth resistor 102. The second terminal of the first capacitor 501 is grounded.

[0059] like Figure 3 As shown, the first capacitor 501 can be used to stabilize the port voltage and reduce switching noise. The capacitance of the first capacitor 501 can be between 10nF and 100nF.

[0060] Continue reading Figure 3 In some implementations, a first inductor 502 is also included.

[0061] The first inductor 502 is connected between the antenna unit 200 and the short-circuit protection unit 400, and between the antenna unit 200 and the sampling unit 100.

[0062] like Figure 3 As shown, the first inductor 502 can be used as part of a low-pass filter, forming an RLC circuit with the third resistor 101 and the first capacitor 501. The self-resonant frequency of the first inductor 502 is not lower than the operating frequency of the antenna state detection circuit. The inductance value of the first inductor 502 can be referenced to the operating frequency of the antenna state detection circuit, satisfying the formula... The current of the first inductor 502 is selected to be no less than twice the maximum operating current of the antenna element 200, which is less than the minimum operating frequency of the antenna state detection circuit. Here, L represents the inductance value of the first inductor 502 and C represents the capacitance value of the first capacitor 501.

[0063] Continue reading Figure 1In some implementations, a bidirectional breakdown diode 503 is also included.

[0064] The first end of the bidirectional breakdown diode 503 is connected between the antenna unit 200 and the short-circuit protection unit 400, and between the antenna unit 200 and the sampling unit 100, while the second end of the bidirectional breakdown diode 503 is grounded.

[0065] like Figure 1 As shown, the bidirectional breakdown diode 503 can be used to prevent the antenna detection circuit from being affected by static electricity. When the circuit is affected by factors such as static electricity, resulting in excessive voltage, the bidirectional breakdown diode 503 is broken down, preventing damage to other components.

[0066] Figure 4 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application. In some embodiments, a fifth resistor 504 is also included.

[0067] The fifth resistor 504 is connected between the short-circuit protection unit 400 and the first diode 201.

[0068] The fifth resistor, 504, can limit the current in the circuit.

[0069] Continue reading Figure 2 In some embodiments, a second capacitor 505 is also included.

[0070] The first terminal of the second capacitor 505, the first terminal of the first resistor 401, and the source of the P-type MOS transistor 4021 are connected in pairs, and the second terminal of the second capacitor 505 is connected between the second terminal of the second resistor 404 and the gate of the P-type MOS transistor 4021.

[0071] like Figure 2 As shown, the second capacitor 505 can serve as a soft start. When the power supply 300 supplies power to the entire antenna status detection circuit and then to the antenna unit 200, the second capacitor 505 will be charged first due to its presence. Only when the second capacitor 505 is "fully charged" can the control P-type MOS transistor 4021 be turned on.

[0072] Continue reading Figure 1 In some implementations, a filter component 600 is also included.

[0073] The first end of the filter component 600 is connected between the short-circuit protection unit 400 and the power supply 300.

[0074] like Figure 1As shown, the filter component 600 may include a third capacitor 601 and a fourth capacitor 602, which can be used as filter capacitors to filter the voltage output by the power supply 300.

[0075] Continue reading Figure 1 The circuit may also include a fifth capacitor 506, the position of which is as follows: Figure 1 As shown, it will not be described again here. The fifth capacitor 506 can be used as a DC blocking capacitor for signal input. The self-resonant frequency of the fifth capacitor 506 can be greater than the signal operating frequency of the antenna element 200. The self-resonant frequency F2≈1 / C5, where C5 is the capacitance value of the fifth capacitor 506.

[0076] Figure 5 This is a schematic diagram of another antenna state detection circuit structure provided in an embodiment of this application. Figure 5 This is a schematic diagram of the circuit structure after combining various embodiments of this application.

[0077] The following is combined with Figure 5 The parameters of some components are illustrated by example.

[0078] The resistance of the fourth resistor 102 can be 499KΩ, and the resistance of the third resistor 101 can be 1MΩ. The resistance values ​​of the third resistor 101 and the fourth resistor 102 can be determined according to the output voltage of the power supply 300 and the range of the sampling unit 100. Under the condition of the output voltage of the power supply 300, the voltage division does not exceed 3.3V.

[0079] The capacitance of the second capacitor 505 can be between 10nF and 100nF, used to stabilize the port voltage and reduce switching noise.

[0080] The resistance value of the fifth resistor 504 can be determined based on the maximum operating current of the antenna element 200, for example, R5 < (V0 - Vref - Vmin) / Imax; where V0 is the input voltage of the power supply 300, Vref is the forward voltage drop of the first diode 201, Vmin is the minimum operating voltage of the antenna element 200, and Imax is the maximum operating current of the antenna element 200.

[0081] The resistance value of the first resistor 401 needs to be referenced to the saturation voltage of the NPN transistor 403. This antenna state detection circuit requires the NPN transistor 403 to operate in the saturation region at power-on. Simultaneously, it requires that when the antenna element 200 is short-circuited to ground or short-circuited to an external power supply, the current through the first resistor 401 does not exceed the maximum current that the first resistor 401 can carry. For example, if the saturation voltage of the NPN transistor 403 is Vq, then (V0-Vref) / P_R1 < R1 < ((V0-Vref-Vq)×(R1+R4)) / Vq. Where V0 is the antenna input voltage, Vref is the forward voltage drop of the first diode 201, P_R1 is the maximum power of R1, R1 represents the resistance value of the first resistor 401, and R4 represents the resistance value of the fourth resistor 102.

[0082] The junction capacitance of the bidirectional breakdown diode 503 should be small to avoid affecting the RF communication performance. The clamping voltage of the bidirectional breakdown diode 503 should be slightly greater than the operating voltage of the antenna status detection circuit.

[0083] The allowable voltage of Vgs / Vds in the P-type MOSFET 4021 shall not be less than the supply voltage of the antenna unit 200, and the allowable current of Id shall not be less than twice the maximum supply current of the antenna unit 200.

[0084] exist Figure 5 In the current configuration, antenna element 200 is in an open-circuit state, and the first switching component 402 is turned on. The current flows through the following path: power supply 300 → first diode 201 → fifth resistor 504 → first switching component 402 → third resistor 101 → fourth resistor 102 → GND. Under this state, the voltage measured by the measuring component can be V. 断 = (V0-Vref) / (R5+R3+R4)×R4, where V0 represents the output voltage of power supply 300, Vref represents the forward voltage drop of the first diode 201, R5 represents the resistance value of the fifth resistor 504, R3 represents the resistance value of the third resistor 101, and R4 represents the resistance value of the fourth resistor 102.

[0085] Antenna unit 200 is in a grounded state. At this time, the first switching component 402 is open, and the current in the circuit flows through the following path: power supply 300 → first diode 201 → fifth resistor 504 → first resistor 401 → first inductor 502 → antenna unit 200 (GND). In this state, the third resistor 101 and the fourth resistor 102 are short-circuited, so the voltage measured by the measuring component can be 0.

[0086] Antenna unit 200 is connected to an external power source, but this external power source is not used to power antenna unit 200. This could potentially damage antenna unit 200. In this state, the first switching component 402 is disconnected, and the current flow path in the circuit is: antenna unit 200 (external power source) → third resistor 101 → fourth resistor 102 → GND. The voltage measured by the measuring component in this state can be V. 短1 =V0 / (R3+R4)×R4. The measurement value of the measuring component can have an upper limit. When the voltage division of the fourth resistor 102 exceeds the upper limit of the measuring component, the measurement value of the measuring component is the upper limit value of the measuring component. For example, if the upper limit of the measuring component is 3.3V, then even if the voltage division of the fourth resistor 102 is 3.4V, the measurement value of the measuring component will still be 3.3V.

[0087] Antenna unit 200 is in the working state. At this time, the first switching component 402 is turned on, and the current flow path in the circuit is as follows: ① Power supply 300 → first diode 201 → fifth resistor 504 → first switching component 402 → third resistor 101 → fourth resistor 102 → GND; ② Power supply 300 → first diode 201 → fifth resistor 504 → first switching component 402 → first inductor 502 → antenna unit 200. That is, in this state, both sampling unit 100 and antenna unit 200 are powered by power supply 300. In this state, the voltage measured by sampling unit 100 can be V. 工 =(V0-Vref-(Iant+I 采 Iant represents the operating current of antenna element 200. 采 This indicates the current in the corresponding paths of the third resistor 101 and the fourth resistor 102.

[0088] This application also provides an electronic device that may include any of the antenna state detection circuits described above.

[0089] This electronic device can achieve the same technical effect as the antenna state detection circuit in any of the above embodiments, and will not be described in detail here.

[0090] It should be noted that the aforementioned electronic devices can be installed in the vehicle, specifically in the in-vehicle system, such as the battery management system; or they can be other terminal devices outside the vehicle, such as mobile phones, computers, smart wearable devices, and other electronic devices, which are not limited here.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. An antenna state detection circuit, characterized in that, include: The sampling unit and the first diode are connected in pairs, and the antenna unit and the negative terminal of the sampling unit and the first diode are connected to the power supply. The sampling unit is used to acquire the measurement voltage. A short-circuit protection unit is disposed between the antenna unit and the negative terminal of the first diode, and between the sampling unit and the negative terminal of the first diode; the short-circuit protection unit includes a first path and a second path, the first path is provided with a first resistor, and the second path is provided with a first switching component; when the antenna unit is in a grounded state and a state connected to an external power supply, the first switching component is open; when the antenna unit is in an open-circuit state and a working state, the first switching component is on.

2. The antenna state detection circuit according to claim 1, characterized in that, The short-circuit protection unit further includes an NPN transistor and a second resistor; the first switching assembly includes a P-type MOSFET. The source of the P-type MOS transistor, the first terminal of the first resistor, and the negative terminal of the first diode are connected in pairs. The drain of the P-type MOS transistor, the second terminal of the first resistor, the antenna unit, and the sampling unit are connected in pairs. The base of the NPN transistor is connected to the second terminal of the first resistor. The collector of the NPN transistor is connected to the first terminal of the second resistor. The emitter of the NPN transistor is grounded. The second terminal of the second resistor is connected to the gate of the P-type MOS transistor. The positive terminal of the first diode is connected to the power supply.

3. The antenna state detection circuit according to claim 1, characterized in that, The sampling unit includes a third resistor, a fourth resistor, and a detection component; The first end of the third resistor and the antenna unit of the short-circuit protection unit are connected in pairs. The second end of the third resistor is connected to the first end of the fourth resistor. The second end of the fourth resistor is grounded. The detection component is connected between the second end of the third resistor and the first end of the fourth resistor.

4. The antenna state detection circuit according to claim 3, characterized in that, It also includes the first capacitor; The first terminal of the first capacitor is connected between the detection component and the second terminal of the third resistor, and between the detection component and the first terminal of the fourth resistor, and the second terminal of the first capacitor is grounded.

5. The antenna state detection circuit according to claim 4, characterized in that, It also includes the first inductor; The first inductor is connected between the antenna unit and the short-circuit protection unit, and also between the antenna unit and the sampling unit.

6. The antenna state detection circuit according to claim 1, characterized in that, It also includes bidirectional breakdown diodes; The first end of the bidirectional breakdown diode is connected between the antenna unit and the short-circuit protection unit, and between the antenna unit and the sampling unit, and the second end of the bidirectional breakdown diode is grounded.

7. The antenna state detection circuit according to claim 1, characterized in that, It also includes a fifth resistor; The fifth resistor is connected between the short-circuit protection unit and the negative terminal of the first diode.

8. The antenna state detection circuit according to claim 2, characterized in that, It also includes a second capacitor; The first terminal of the second capacitor, the first terminal of the first resistor, and the source of the P-type MOS transistor are connected in pairs, and the second terminal of the second capacitor is connected between the second terminal of the second resistor and the gate of the P-type MOS transistor.

9. The antenna state detection circuit according to claim 1, characterized in that, It also includes a filtering component; The first end of the filter component is connected between the short-circuit protection unit and the power supply.

10. An electronic device, characterized in that, Includes the antenna status detection circuit as described in any one of claims 1-9.

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