Automatic radio frequency matching control system, base station system and method

Abstract

The embodiment of the present invention discloses an automatic radio frequency matching control system and a base station system and method, including: a power detection switching unit, a matching circuit, a power detection circuit and a controller; the base station, the power detection switching unit, the matching circuit and the antenna are connected in sequence; the power detection circuit is connected to the power detection switching unit; and the controller is connected to the power detection circuit and the matching circuit respectively. Specifically, in this solution, the power detection switching unit is used to ensure the reception and transmission of radio frequency signals, while detecting the radio frequency power of the return loss at the matching end; the adjustable inductor and adjustable capacitor in the matching circuit are used to achieve impedance matching; the radio frequency power of the return loss at the matching end is detected by the power detection circuit; and the automatic matching circuit is controlled by the controller according to the detected radio frequency power of the return loss at the matching end. The radio frequency power with the minimum return loss at the matching end is obtained by adjustment. Impedance matching between the base station and the antenna is achieved, solving the problem of mismatch after the antenna is installed.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency communication technology, and in particular to an automatic radio frequency matching control system and a base station system and method. Background Art

[0002] Antennas are crucial for radiating energy from wireless communication devices, such as base stations. In some outdoor base stations and wireless communication systems, external antennas are often used to facilitate deployment and increase coverage. RF signal transmission requires that the impedance of each transmission node, including the base station interface, RF cables, and antennas, be 50 ohms, ensuring lossless RF signal transmission. However, during installation and deployment, antennas and transmission cables are often affected by environmental factors, mounting structure factors, and process factors, resulting in a mismatch between the actual connection and the base station. This impedance mismatch causes the RF signal output by the base station to be transmitted back to the base station. This not only damages the base station's power unit but also reduces the actual output power, thereby decreasing the base station's signal coverage.

[0003] Therefore, there is a need for a solution to solve the problems in the prior art. Summary of the Invention

[0004] In view of this, the present invention proposes an automatic radio frequency matching control system and a base station system and method, which realizes impedance matching between the base station and the antenna through a power detection switching unit, a matching circuit, a power detection circuit and a controller, and solves the problem of mismatch after the antenna is installed.

[0005] Specifically, the present invention proposes the following specific embodiments:

[0006] The embodiment of the present invention provides an automatic radio frequency matching control system, which is applied between a base station and an antenna. The system includes: a power detection switching unit, a matching circuit, a power detection circuit and a controller;

[0007] The power detection switching unit is used to connect to the base station, the power detection switching unit is connected to the matching circuit, and the matching circuit is used to connect to the antenna to form a radio frequency signal transceiver channel;

[0008] The power detection circuit is connected to the power detection switching unit to detect the power loss of the radio frequency signal passing through the power detection switching unit;

[0009] The controller is connected to the power detection circuit and the matching circuit respectively to adjust the matching circuit based on the power loss to achieve impedance matching.

[0010] In a specific embodiment, the power detection switching unit includes: a coupler; wherein the coupler is provided with four interfaces; wherein the first interface is connected to the base station, the second interface is connected to the matching circuit, the third interface is connected to the preset grounded inductor, and the fourth interface is connected to the power detection circuit.

[0011] In a specific embodiment, the power detection switching unit includes: a first radio frequency switch, a second radio frequency switch, and a circulator;

[0012] One end of the first RF switch is used to connect to the base station, and the other end of the first RF switch and one end of the second RF switch form two paths, one of which is provided with the circulator;

[0013] The other end of the second RF switch is connected to the matching circuit;

[0014] The circulator is connected to the power detection circuit.

[0015] In a specific embodiment, the power detection circuit includes: a Maxim MAX2206 power detection chip.

[0016] In a specific embodiment, the matching circuit includes: an adjustable inductor and an adjustable capacitor; wherein the adjustable inductor is connected in series between the power detection switching unit and the antenna; one end of the adjustable capacitor is connected to the adjustable inductor, and the other end of the adjustable capacitor is grounded;

[0017] The adjustable inductor and the adjustable capacitor are both connected to the controller.

[0018] In a specific embodiment, two adjustable capacitors are provided, one located on each side of the adjustable inductor.

[0019] In a specific embodiment, the adjustable capacitor is a digital adjustable capacitor.

[0020] In a specific embodiment, the adjustable capacitor is a digital adjustable capacitor with model number PE64904.

[0021] In a specific embodiment, the adjustable inductor includes a third radio frequency switch and a plurality of inductor units;

[0022] The third RF switch is connected to the controller; one end of the third RF switch is provided with a first contact, and the other end is provided with a plurality of second contacts;

[0023] A plurality of the inductance units are connected in series to form an inductance group;

[0024] The first contact is connected to an endpoint on one side of the inductor group, one second contact is connected to an endpoint on the other side of the inductor group, and the remaining second contacts are respectively connected to the connection points between two adjacent inductor units in the inductor group. Different second contacts are connected to different points, so that the inductance can be adjusted through the connection between the first contact and different second contacts.

[0025] In a specific embodiment, the controller is provided with an analog-to-digital converter; the analog-to-digital converter is connected to the power detection circuit.

[0026] An embodiment of the present invention further discloses a base station system, including the above-mentioned automatic radio frequency matching control system.

[0027] An embodiment of the present invention further discloses an automatic radio frequency matching control method, which is applied to the above-mentioned automatic radio frequency matching control system. The method includes:

[0028] Transmitting a TX radio frequency signal in the automatic radio frequency matching control system;

[0029] Acquiring echo data through the controller, the echo data including an ADC value corresponding to the return loss, and an inductance value and a capacitance value corresponding to the ADC value;

[0030] Adjusting the capacitance and inductance in the matching circuit by the controller, and obtaining echo data obtained after the adjustment;

[0031] Selecting echo data with the smallest ADC value from the plurality of echo data, and using the inductance value and the capacitance value in the selected echo data as a matching result;

[0032] Stop transmitting TX RF signal;

[0033] configuring the matching circuit based on the matching result by the controller;

[0034] Turn on the base station.

[0035] Thus, embodiments of the present invention provide an automatic RF matching control system and base station system and method, applied between a base station and an antenna. The system includes: a power detection switching unit, a matching circuit, a power detection circuit, and a controller. The base station, the power detection switching unit, the matching circuit, and the antenna are sequentially connected to form a RF signal transceiver channel. The power detection circuit is connected to the power detection switching unit to detect the power loss of the RF signal passing through the power detection switching unit. The controller is connected to the power detection circuit and the matching circuit to adjust the matching circuit based on the power loss to achieve impedance matching. Specifically, in this solution, the power detection switching unit ensures the transmission and reception of RF signals while also detecting the RF power of the matching end return loss. Impedance matching is achieved through adjustable inductors and capacitors in the matching circuit. The power detection circuit detects the RF power of the matching end return loss. The controller then controls the automatic matching circuit based on the detected RF power of the matching end return loss. Adjustments are made to achieve impedance matching between the base station and the antenna, resolving the problem of antenna mismatch after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope of protection of the present invention. In each of the drawings, similar components are numbered similarly.

[0037] Figure 1 A schematic structural diagram of an automatic radio frequency matching control system according to an embodiment of the present invention is shown;

[0038] Figure 2 A schematic diagram of a specific structure of an automatic radio frequency matching control system according to an embodiment of the present invention is shown;

[0039] Figure 3 Another specific structural diagram of an automatic radio frequency matching control system according to an embodiment of the present invention is shown;

[0040] Figure 4 A schematic structural diagram of a matching circuit in an automatic radio frequency matching control system according to an embodiment of the present invention is shown;

[0041] Figure 5 A schematic diagram of the structure of an adjustable inductor in an automatic radio frequency matching control system according to an embodiment of the present invention is shown;

[0042] Figure 6 A schematic flow chart of an automatic radio frequency matching control method according to an embodiment of the present invention is shown;

[0043] Figure 7 A schematic diagram showing a specific flow chart of an automatic radio frequency matching control method according to an embodiment of the present invention is shown;

[0044] Figure 8 Another specific flow chart of an automatic radio frequency matching control method in an embodiment of the present invention is shown.

[0045] Legend:

[0046] 100-power detection switching unit;

[0047] 110-coupler;

[0048] 121 - first radio frequency switch; 122 - second radio frequency switch; 123 - circulator;

[0049] 200-matching circuit;

[0050] 210-adjustable inductor; 211-third RF switch; 212-inductor unit;

[0051] 220-adjustable capacitor;

[0052] 300-power detection circuit; 400-controller; 500-base station; 600-antenna. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0054] The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the figures is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort are intended to be within the scope of protection of the present invention.

[0055] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0056] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0057] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present invention pertain. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present invention.

[0058] Example 1

[0059] Embodiment 1 of the present invention discloses an automatic radio frequency matching control system, such as Figure 1 As shown, the system is applied between a base station 500 and an antenna 600, and includes: a power detection switching unit 100, a matching circuit 200, a power detection circuit 300 and a controller 400;

[0060] The power detection switching unit 100 is used to connect to the base station 500, and the power detection switching unit 100 is connected to the matching circuit 200, and the matching circuit 200 is used to connect to form a radio frequency signal transceiver channel;

[0061] The power detection circuit 300 is connected to the power detection switching unit 100 to detect the power loss of the radio frequency signal passing through the power detection switching unit 100;

[0062] The controller 400 is connected to the power detection circuit 300 and the matching circuit 200 respectively to adjust the matching circuit 200 based on the power loss to achieve impedance matching. Specifically, for example, a preset mapping table can be used to adjust the impedance to achieve impedance matching.

[0063] This solution uses a power detection switching unit 100 to ensure the transmission and reception of RF signals while also detecting the RF power of the matching end return loss. Impedance matching is achieved through the adjustable inductor 210 and adjustable capacitor 220 in the matching circuit 200. The power detection circuit 300 detects the RF power of the matching end return loss. The controller 400 then controls the automatic matching circuit 200 based on the detected RF power of the matching end return loss. Adjustments are made to achieve the RF power that minimizes the matching end return loss. This achieves impedance matching between the base station 500 and the antenna 600, resolving the issue of mismatching after the antenna 600 is installed.

[0064] Example 2

[0065] like Figure 2As shown, embodiment 2 of the present invention discloses an automatic radio frequency matching control system. Based on the embodiment, it is further defined that the power detection switching unit 100 includes: a coupler 110; wherein the coupler 110 is provided with 4 ports; wherein port 1 is connected to the base station 500, port 2 is connected to the matching circuit 200, port 3 is connected to a preset grounded inductor, and port 4 is connected to the power detection circuit 300.

[0066] like Figure 2 As shown, the power detection switching unit 100 includes a coupler 110. The operating principle of the coupler 110 is as follows: When the TX / RX (transmit / receive signals) output by the base station 500 pass through the coupler 110 to the matching circuit 200, there is insertion loss passing through the coupler 110. The coupling end of the coupler 110 is connected to the power detection circuit 300. When the antenna 600 impedance is mismatched, return loss is generated from the antenna 600 toward the second interface of the coupler 110. After passing through the coupler 110, this return loss power generates coupled power at the fourth interface of the coupler 110. The power detection circuit 300 detects the magnitude of the return loss coupled power.

[0067] The advantages of this embodiment are: simple solution, few components, relatively low cost; and generally applicable to high-power systems.

[0068] Example 3

[0069] like Figure 3 As shown, embodiment 3 of the present invention discloses an automatic radio frequency matching control system, which is further limited on the basis of embodiment 1, wherein the power detection switching unit 100 includes: a first radio frequency switch 121, a second radio frequency switch 122 and a circulator 123;

[0070] One end of the first RF switch 121 is connected to the base station 500 , and the other end of the first RF switch 121 and one end of the second RF switch 122 form two paths, one of which is provided with the circulator 123 ;

[0071] The other end of the second RF switch 122 is connected to the matching circuit 200;

[0072] The circulator 123 is connected to the power detection circuit 300 .

[0073] like Figure 3 As shown, in this solution, two RF switches and a circulator 123 are used. When base station 500 is first powered on, controller 400 (e.g., a central processing unit (CPU)) switches the first RF switch 121 and the second RF switch 122 to the circulator 123 path. This path automatically achieves impedance matching. Once matching is complete, the path is switched to the path without the circulator 123, enabling normal RF transmission and reception.

[0074] Among them, such as Figure 3 As shown, the operating principle of circulator 123 is as follows: when an RF signal enters port 1, it is output from port 2; when an RF signal enters port 2, it is output from port 3; and when an RF signal enters port 3, it is output from port 1. Signals passing through circulator 123 experience insertion loss. The amount of this loss is determined by the characteristics of circulator 123.

[0075] Therefore, when the impedance of antenna 600 is mismatched, return loss is generated from antenna 600 through second RF switch 122 toward the second port of circulator 123. The return loss power of antenna 600 passes through the second RF switch and then loops through the second port of circulator 123 to the third port. The return loss is detected by power detection circuit 300.

[0076] Advantages of this solution: The insertion loss of the circulator 123 and the RF switch is very small, so the power of the return loss is basically all detected by the power detection circuit 300, so the actual power detected is relatively high.

[0077] Example 4

[0078] Embodiment 4 of the present invention discloses an automatic radio frequency matching control system, which is further defined based on Embodiments 1-3, wherein the power detection circuit 300 includes a Maxim MAX2206 power detection chip.

[0079] Specifically, the power detection circuit 300 detects return loss power. Therefore, it is a device for detecting RF power. For example, the Maxim MAX2206 power detection chip can be used. It measures the return loss RF signal strength and converts it into a voltage between 0 and 2.5V. The output of the MAX2206 is connected to the controller 400. Furthermore, the controller 400 includes an analog-to-digital converter (ADC), which is connected to the power detection circuit 300.

[0080] Specifically, for example, the output end of MAX2206 can be connected to an ADC (analog-to-digital converter) of a CPU (central processing unit) to convert a 0-2.5V voltage into a digital value.

[0081] In addition, if Figure 4 As shown, the matching circuit 200 includes: an adjustable inductor 210 and an adjustable capacitor 220; wherein the adjustable inductor 210 is connected in series between the power detection switching unit 100 and the antenna 600; one end of the adjustable capacitor 220 is connected to the adjustable inductor 210, and the other end of the adjustable capacitor 220 is grounded;

[0082] The adjustable inductor 210 and the adjustable capacitor 220 are both connected to the controller 400 .

[0083] Specifically, the matching circuit 200 is designed as a π-shaped circuit, usually using a series inductor and a parallel capacitor to ground, such as Figure 4 shown.

[0084] Further, such as Figure 4 As shown, there are two adjustable capacitors 220 , which are located on both sides of the adjustable inductor 210 .

[0085] In a specific embodiment, the adjustable capacitor 220 is a digital adjustable capacitor 220 .

[0086] Furthermore, the adjustable capacitor 220 is a digital adjustable capacitor 220 with a model number of PE64904.

[0087] Specifically, to achieve automatic matching, the matching capacitors and inductors must be digitally controlled, with the controller 400 adjusting their parameters. Therefore, a 5-bit, 32-state digitally adjustable capacitor 220, model PE64904, can be used. Its capacitance is controlled via a 3-wire serial SPI interface. The capacitance value of a series-connected capacitor in the circuit is 0.7-4.6pF, while the capacitance value of a parallel-connected capacitor is 1.12-5.18pF. All decoding and configuration are integrated within the chip, eliminating the need for additional bypass and filtering components, making it well-suited for this solution.

[0088] In addition, if Figure 5 As shown, the adjustable inductor 210 includes a third RF switch 211 and a plurality of inductor units 212;

[0089] The third RF switch 211 is connected to the controller 400 ; one end of the third RF switch 211 is provided with a first contact, and the other end is provided with a plurality of second contacts;

[0090] A plurality of the inductance units 212 are connected in series to obtain an inductance group;

[0091] The first contact is connected to an endpoint on one side of the inductor group, one second contact is connected to an endpoint on the other side of the inductor group, and the remaining second contacts are respectively connected to points between two adjacent inductor units 212 in the inductor group. Different second contacts are connected to different points, so that the inductance can be adjusted through the connection between the first contact and different second contacts.

[0092] Specifically, the digital adjustment of the inductance can be achieved by using the interaction between the radio frequency switch and the inductor. Figure 6As shown, when the third RF switch 211 is connected to port 2, no inductor is connected to the circuit. When the RF switch is controlled to connect ports 1 and 3, the L6 inductor (also known as the inductor unit 212, and the other L1-L5Y are also inductor units 212) is connected to the circuit for matching. When ports 1 and 4 are connected, the L5 and L6 inductors participate in the circuit matching.

[0093] Example 5

[0094] Embodiment 5 of the present invention further discloses a base station system, including the automatic radio frequency matching control system described in embodiments 1-4.

[0095] Example 6

[0096] Embodiment 5 of the present invention further discloses an automatic radio frequency matching control method, which is applied to the automatic radio frequency matching control system described in embodiments 1-4. Figure 6 As shown, the method includes:

[0097] Step S101: transmitting a radio frequency signal in the automatic radio frequency matching control system;

[0098] Specifically, the radio frequency signal here is a simulated TX (transport) radio frequency signal of a base station.

[0099] Step S102: Acquire echo data through the controller 400, where the echo data includes an ADC value corresponding to the return loss, and an inductance value and a capacitance value corresponding to the ADC value;

[0100] Step S103: adjusting the capacitance and inductance in the matching circuit 200 through the controller 400, and acquiring echo data obtained after the adjustment;

[0101] Step S104: selecting echo data with the smallest ADC value from the plurality of echo data, and taking the inductance value and capacitance value in the selected echo data as a matching result;

[0102] Step S105: stop transmitting the radio frequency signal;

[0103] Step S106: configuring the matching circuit 200 based on the matching result by the controller 400;

[0104] Step S107: Turn on the base station.

[0105] Specifically, in a specific application scenario, the method includes the following steps:

[0106] (1) Startup and system initialization

[0107] (2)CPU controls the transmission of TX radio frequency signal.

[0108] (3) The ADC interface of the CPU detects the current return loss power value.

[0109] (4) The CPU controls the digitally adjustable capacitor and adjustable inductor through digital interfaces such as SPI and GPIO to adjust the matching value.

[0110] (5) Each time an adjustment is made, read the ADC interface detection value.

[0111] (6) Traverse all possible matching solutions and compare the detected return loss values. Take the minimum ADC value (return loss value).

[0112] (7) The matching solution with the minimum value is used as the final matching solution and recorded in the CPU.

[0113] (8) The matching is completed and the system operates normally.

[0114] In addition, for the different structures of the above-mentioned embodiment 2 and embodiment 3, the corresponding methods are also different. For example, the control method of the structure of embodiment 2 is as follows: Figure 7 As shown, the control method of the structure in Example 3 is as follows Figure 8 This solution can achieve automatic matching between the base station and the antenna, effectively solving the mismatch problem after the antenna is installed, and is low-cost.

[0115] In this regard, an embodiment of the present invention proposes an automatic RF matching control system and a base station system and method, which are applied between a base station 500 and an antenna 600. The system includes: a power detection switching unit 100, a matching circuit 200, a power detection circuit 300 and a controller 400; the power detection switching unit 100 is used to connect 500, the power detection switching unit 100 is connected to the matching circuit 200, and the matching circuit 200 can be connected to the antenna 600 to form a RF signal transceiver channel; the power detection circuit 300 is connected to the power detection switching unit 100 to detect the power loss of the RF signal passing through the power detection switching unit 100; the controller 400 is respectively connected to the power detection circuit 300 and the matching circuit 200 to adjust the matching circuit 200 based on the power loss to achieve impedance matching. Specifically, in this solution, the power detection switching unit 100 ensures the transmission and reception of RF signals while also detecting the RF power of the matching end return loss. Impedance matching is achieved through the adjustable inductor 210 and adjustable capacitor 220 in the matching circuit 200. The power detection circuit 300 detects the RF power of the matching end return loss. The controller 400 then controls the automatic matching circuit 200 based on the detected RF power of the matching end return loss. Adjustments are made to achieve the RF power with the minimum matching end return loss. This achieves impedance matching between the base station 500 and the antenna 600, resolving the issue of mismatching after the antenna 600 is installed.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. It should also be noted that in alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or flow chart, and the combination of boxes in the structure diagram and / or flow chart, can be implemented with a dedicated hardware-based system that performs the specified functions or actions, or can be implemented with a combination of dedicated hardware and computer instructions.

[0117] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0118] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. An automatic radio frequency matching control system, characterized in that: Applied between a base station and an antenna, the system includes: a power detection switching unit, a matching circuit, a power detection circuit, and a controller; The power detection switching unit is used to connect to the base station, the power detection switching unit is connected to the matching circuit, and the matching circuit is used to connect to the antenna to form a radio frequency signal transceiver channel; The power detection circuit is connected to the power detection switching unit to detect the power loss of the radio frequency signal passing through the power detection switching unit; The controller is connected to the power detection circuit and the matching circuit respectively to adjust the matching circuit based on the power loss to achieve impedance matching; The power detection switching unit includes: a first radio frequency switch, a second radio frequency switch and a circulator; One end of the first RF switch is used to connect to the base station, and the other end of the first RF switch and one end of the second RF switch form two paths, one of which is provided with the circulator; The other end of the second RF switch is connected to the matching circuit; The circulator is connected to the power detection circuit; The matching circuit includes: an adjustable inductor and an adjustable capacitor; the adjustable inductor and the adjustable capacitor are both connected to the controller; The adjustable capacitor is a digitally adjustable capacitor, and the adjustable inductor includes a third radio frequency switch and a plurality of inductor units; The third RF switch is connected to the controller; one end of the third RF switch is provided with a first contact, and the other end is provided with a plurality of second contacts; A plurality of the inductance units are connected in series to form an inductance group; The first contact is connected to an endpoint on one side of the inductor group, one second contact is connected to an endpoint on the other side of the inductor group, and the remaining second contacts are respectively connected to the connection points between two adjacent inductor units in the inductor group. Different second contacts are connected to different points, so that the inductance can be adjusted through the connection between the first contact and different second contacts.

2. The system according to claim 1, wherein The power detection switching unit includes: a coupler; wherein the coupler is provided with four interfaces; wherein the first interface is connected to the base station, the second interface is connected to the matching circuit, the third interface is connected to the preset grounded inductor, and the fourth interface is connected to the power detection circuit.

3. The system according to any one of claims 1 to 2, wherein: The power detection circuit includes: a MaximMAX2206 power detection chip.

4. The system according to any one of claims 1 to 2, wherein: The adjustable inductor is connected in series between the power detection switching unit and the antenna; one end of the adjustable capacitor is connected to the adjustable inductor, and the other end of the adjustable capacitor is grounded.

5. The system according to claim 4, wherein: There are two adjustable capacitors, which are located on both sides of the adjustable inductor respectively.

6. The system according to any one of claims 1 to 2, characterized in that The controller is provided with an analog-to-digital converter; the analog-to-digital converter is connected to the power detection circuit.

7. A base station system, characterized in that: The automatic radio frequency matching control system comprises the automatic radio frequency matching control system according to any one of claims 1 to 6.

8. An automatic radio frequency matching control method, characterized in that: The automatic radio frequency matching control system according to any one of claims 1 to 6 comprises: transmitting a radio frequency signal in the automatic radio frequency matching control system; Acquiring echo data through the controller, the echo data including an ADC value corresponding to the return loss, and an inductance value and a capacitance value corresponding to the ADC value; Adjusting the capacitance and inductance in the matching circuit by the controller, and obtaining echo data obtained after the adjustment; Selecting echo data with the smallest ADC value from the plurality of echo data, and using the inductance value and the capacitance value in the selected echo data as a matching result; Stop transmitting radio frequency signals; configuring the matching circuit based on the matching result by the controller; Turn on the base station.

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