Impedance tuning circuit and electronic equipment

Abstract

The invention discloses an impedance tuning circuit and electronic equipment, and belongs to the technical field of communication. Wherein the impedance tuning circuit is used for tuning impedance between the transceiver and the antenna, the transceiver and the antenna are connected through a transmission line, and the impedance tuning circuit comprises an impedance tuner which is connected in series between the transceiver and the antenna; the input end of the control circuit is connected to the transmission line, and the output end of the control circuit is connected to the impedance tuner; wherein the control circuit is used for controlling the operation of the impedance tuner according to a first signal input by the input end of the control circuit and a second signal output by the output end of the control circuit, so as to tune the impedance between the transceiver and the antenna.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to an impedance tuning circuit and an electronic device. Background Art

[0002] In the related technology, the impedance matching between the transceiver and the antenna has an important impact on the operation performance of the antenna. Specifically, the antenna needs to work in multiple frequency bands, so different impedance matching is required for different working frequency bands to achieve excellent communication indicators.

[0003] The current impedance matching technology uses a discrete tuner; this discrete tuner contains a limited number of capacitors or inductors with different values; the controller identifies the working frequency band of the wireless system at this time, and then connects the preset capacitors or inductors in the tuner to the circuit through the controller to achieve circuit matching tuning. This solution cannot achieve continuous adjustment and can only choose from discrete values, so the adjustment ability is limited. Summary of the invention

[0004] The present application aims to provide an impedance tuning circuit and an electronic device, which can solve the problem of limited impedance adjustment capability of the impedance tuning circuit in the related art.

[0005] In a first aspect, an embodiment of the present application provides an impedance tuning circuit for tuning the impedance between a transceiver and an antenna, wherein the transceiver and the antenna are connected via a transmission line, and the impedance tuning circuit includes:

[0006] An impedance tuner, connected in series between the transceiver and the antenna;

[0007] a control circuit, wherein an input end of the control circuit is connected to the transmission line, and an output end of the control circuit is connected to the impedance tuner;

[0008] The control circuit is used to control the operation of the impedance tuner according to a first signal input to the input end of the control circuit and a second signal output to the output end of the control circuit, so as to tune the impedance between the transceiver and the antenna.

[0009] In a second aspect, an embodiment of the present application provides an electronic device, comprising an impedance tuning circuit as in the first aspect.

[0010] The impedance tuning circuit of the embodiment of the present application is configured with an impedance tuner and a control circuit. When the transceiver sends a radio frequency signal to the antenna, the control circuit can receive in real time the power signal reflected from the impedance tuner to the transceiver and generate a first signal, and then generate a second signal based on the first signal. Finally, the control circuit controls the operation of the impedance tuner based on the first signal and the second signal, thereby realizing continuous tuning of the impedance between the transceiver and the antenna by the impedance tuning circuit, thereby improving the impedance tuning effect between the transceiver and the antenna.

[0011] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0013] Figure 1 One of the structural schematic diagrams of the impedance tuning circuit of an embodiment of the present application is shown;

[0014] Figure 2 Shows Figure 1 Schematic diagram of the structure of the medium impedance tuner;

[0015] Figure 3 A second structural schematic diagram of the impedance tuning circuit of an embodiment of the present application is shown;

[0016] Figure 4 A structural block diagram of an electronic device according to an embodiment of the present application is shown.

[0017] Reference numerals:

[0018] 100 impedance tuning circuit, 102 impedance tuner, 104 control circuit, 106 acquisition unit, 108 control unit, 110 coupler, 112 detector, 114 error amplifier, 116 first coil, 118 magnetic core, 120 isolation component, 122 first capacitor, 124 second capacitor, 126 filtering component, 128 first choke, 130 second choke, 132 housing, 134 elastic member, 200 transceiver, 202 transmission line, 300 antenna, 400 electronic device. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0020] The features of the terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0021] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] Combine the following Figures 1 to 4 An impedance tuning circuit and an electronic device according to embodiments of the present application are described.

[0023] In some embodiments of the present application, an impedance tuning circuit is provided. Figure 1 FIG. 1 shows one of the structural schematic diagrams of the impedance tuning circuit of an embodiment of the present application, such as Figure 1 As shown, the impedance tuning circuit 100 is used to tune the impedance between the transceiver 200 and the antenna 300. The transceiver 200 and the antenna 300 are connected through a transmission line 202. The impedance tuning circuit 100 includes: an impedance tuner 102, which is connected in series between the transceiver 200 and the antenna 300; a control circuit 104, wherein the input end of the control circuit 104 is connected to the transmission line 202, and the output end of the control circuit 104 is connected to the impedance tuner 102; wherein the control circuit 104 is used to control the operation of the impedance tuner 102 according to a first signal input to the input end of the control circuit 104 and a second signal output from the output end of the control circuit 104, so as to tune the impedance between the transceiver 200 and the antenna 300.

[0024] In the embodiment of the present application, the impedance tuning circuit 100 is used to tune the impedance matching between the transceiver 200 and the antenna 300, so that the transceiver 200 and the antenna 300 have good impedance matching, so that the power of the radio frequency signal sent by the transceiver 200 can be radiated and output by the electromagnetic wave signal emitted by the antenna 300 as much as possible, thereby ensuring the signal transmission efficiency of the antenna. Specifically, the transceiver 200 and the antenna 300 are connected through the transmission line 202, and the impedance tuning circuit 100 is connected between the transceiver 200 and the antenna 300.

[0025] Furthermore, the impedance tuning circuit 100 includes an impedance tuner 102, which is connected in series between the transceiver 200 and the antenna 300. The operation of the impedance tuner 102 can achieve impedance tuning between the transceiver 200 and the antenna 300. At the same time, the impedance tuning circuit 100 also includes a control circuit 104, the input end of the control circuit 104 is connected to the transmission line 202, and the output end of the control circuit 104 is connected to the impedance tuner 102.

[0026] Specifically, by connecting the input end of the control circuit 104 to the transmission line 202, the control circuit 104 can receive the power signal reflected from the impedance tuner 102 to the transceiver 200 during the process of the transceiver 200 transmitting the radio frequency signal to the antenna 300, and generate a first signal according to the power signal. After passing through the control circuit 104, the first signal can also generate a second signal, which is output through the output end of the control circuit 104. Further, the output end of the control circuit 104 is also connected to the impedance tuner 102, so that the control circuit 104 can control the operation of the impedance tuner 102 according to the first signal and the second signal, so as to achieve the tuning and matching of the impedance between the transceiver 200 and the antenna 300.

[0027] It is understandable that during the operation of the impedance tuning circuit 100, the first signal is formed according to the power signal reflected by the impedance tuner 102 and returned to the transceiver 200, and the second signal is generated in real time according to the first signal, so that the operation of the impedance tuner 102 can be controlled in real time according to the first signal and the second signal, and then the continuous tuning process of the impedance between the transceiver 200 and the antenna 300 can be realized. Compared with the impedance tuning in the related art that can only be tuned in discrete form, the impedance tuning effect is better.

[0028] The impedance tuning circuit 100 of the embodiment of the present application is provided with an impedance tuner 102 and a control circuit 104. When the transceiver 200 sends a radio frequency signal to the antenna 300, the control circuit 104 can receive in real time the power signal reflected from the impedance tuner 102 to the transceiver 200 and generate a first signal, and then generate a second signal according to the first signal. Finally, the control circuit 104 controls the operation of the impedance tuner 102 according to the first signal and the second signal, thereby realizing continuous tuning of the impedance between the transceiver 200 and the antenna 300 by the impedance tuning circuit 100, thereby improving the impedance tuning effect between the transceiver 200 and the antenna 300.

[0029] In some embodiments of the present application, Figure 2 Shows Figure 1 Schematic diagram of the structure of the impedance tuner, the impedance tuner 102 includes: a first coil 116, the first coil 116 is connected in series between the transceiver 200 and the antenna 300, and one end of the first coil 116 is connected to the output end of the control circuit 104; a magnetic core 118, the magnetic core 118 is movably inserted in the first coil 116; wherein the control circuit 104 is used to adjust the current in the first coil 116 according to the first signal and the second signal to adjust the length of the portion of the magnetic core 118 inserted into the first coil 116 to tune the inductance value of the impedance tuner 102.

[0030] In an embodiment of the present application, the impedance tuner 102 may include a first coil 116 and a magnetic core 118, wherein the magnetic core 118 is movably inserted in the first coil 116. During the process of the control circuit 104 controlling the impedance tuner 102, the length of the portion of the magnetic core 118 inserted into the first coil 116 can be adjusted by adjusting the current in the first coil 116, that is, adjusting the inductance value of the impedance tuner 102, thereby achieving tuning of the impedance matching between the transceiver 200 and the antenna 300.

[0031] Specifically, the first coil 116 is connected in series between the transceiver 200 and the antenna 300 , and the output end of the control circuit 104 is connected to one end of the first coil 116 , so that the control circuit 104 can adjust the magnitude of the current in the first coil 116 .

[0032] Exemplarily, when the first voltage signal is less than the second voltage signal, the error amplifier 114 outputs a forward voltage, which acts on the first coil 116, and the first coil 116 generates a magnetic field. This magnetic field interacts with the magnetic core 118, and the magnetic core 118 can be more deeply incorporated into the first coil 116, thereby increasing the inductance of the first coil 116, thereby increasing the inductance, thereby adjusting the impedance matching between the transceiver 200 and the antenna 300. On the contrary, when the first voltage signal is greater than the second voltage signal, the error amplifier 114 can output a reverse voltage, which acts on the first coil 116, and the first coil 116 generates a magnetic field. This magnetic field interacts with the magnetic core 118, and the magnetic core 118 can be more deeply incorporated into the first coil 116, thereby reducing the inductance of the first coil 116, thereby reducing the inductance, thereby adjusting the impedance matching between the transceiver 200 and the antenna 300.

[0033] In some embodiments of the present application, Figure 2 As shown, the impedance tuning circuit 100 further includes: an isolation component 120 disposed on the transmission line 202 , and the isolation component 120 is used to isolate the DC current between the transceiver 200 and the control circuit 104 , and to isolate the DC current between the antenna 300 and the control circuit 104 .

[0034] In the embodiment of the present application, the impedance tuning circuit 100 also includes an isolation component 120. Through the isolation component 120, the DC current between the control circuit 104 and the transceiver 200, and between the control circuit 104 and the antenna 300 can be isolated to prevent the DC current of the control circuit 104 from interfering with the RF signal sent from the transceiver 200 to the antenna 300 during operation.

[0035] It is understandable that the transceiver 200 transmits a radio frequency signal to the antenna 300, and the signal output by the control circuit 104 in the process of controlling the impedance tuner 102 is a direct current. Therefore, in order to prevent the direct current output by the control circuit 104 during operation from interfering with the radio frequency signal transmitted by the transceiver 200, an isolation component 120 may be provided in the impedance tuning circuit 100, thereby ensuring stable transmission of the radio frequency signal transmitted by the transceiver 200.

[0036] In some embodiments of the present application, Figure 2 As shown, the isolation component 120 includes: a first capacitor 122, one end of the first capacitor 122 is connected to the transceiver 200, and the other end of the first capacitor 122 is connected to the first coil 116; a second capacitor 124, one end of the second capacitor 124 is connected to the antenna 300, and the other end of the second capacitor 124 is connected to the first coil 116.

[0037] In the embodiment of the present application, the isolation component 120 may include a first capacitor 122 disposed between the transceiver 200 and the first coil 116, and a second capacitor 124 disposed between the antenna 300 and the first coil 116. It is understandable that the output end of the control circuit 104 is connected to the first coil 116, and the two ends of the first coil 116 are respectively connected to the transceiver 200 and the antenna 300. Therefore, by providing the first capacitor 122 and the second capacitor 124, the DC current between the first coil 116 and the transceiver 200 and the antenna 300 is isolated, and then the DC current between the control circuit 104 and the transceiver 200 and the antenna 300 is isolated.

[0038] In some embodiments of the present application, Figure 2 As shown, the impedance tuning circuit 100 further includes a filtering component 126 disposed between the control circuit 104 and the impedance tuner 102 for filtering the radio frequency signal transmitted to the control circuit 104 .

[0039] In the embodiment of the present application, the impedance tuning circuit 100 further includes a filter component 126. By setting the filter component 126, it is possible to filter the radio frequency signal flowing to the control circuit 104. It can be understood that the input and output signals during the operation of the control circuit 104 are both direct currents, and the signals transmitted between the transceiver 200 and the antenna 300 are radio frequency signals. Therefore, in order to prevent the radio frequency signal from interfering with the direct current signal received and transmitted during the operation of the control circuit 104, the filter component 126 can be set to filter the radio frequency signal flowing to the control circuit 104 to ensure that the control circuit 104 can operate normally.

[0040] In some embodiments of the present application, Figure 2 As shown, the filter component 126 includes: a first choke 128, one end of the first choke 128 is connected to the output end of the control circuit 104, and the other end of the first choke 128 is connected to one end of the first coil 116; a second choke 130, one end of the second choke 130 is connected to the other end of the first coil 116, and the other end of the second choke 130 is grounded.

[0041] In the embodiment of the present application, the filter component 126 may include a first choke 128 and a second choke 130, wherein the first choke 128 is connected between the output end of the control circuit 104 and one end of the first coil 116. One end of the second choke 130 is connected to the other end of the first coil 116, and the other end of the second choke 130 is grounded.

[0042] Specifically, during the operation of the control circuit 104, the DC current signal output by the output end of the control circuit 104 flows through one end of the first coil 116 to the other end of the first coil 116, and finally flows to the ground end, completing the circulation loop of the DC current signal. Through the setting of the first choke 128 and the second choke 130, during the transmission of the DC current signal, when a radio frequency signal appears, the radio frequency signal can be filtered by the first choke 128 and the second choke 130 to ensure the normal operation of the control circuit 104.

[0043] In some embodiments of the present application, Figure 2 and Figure 3 As shown, the impedance tuner 102 further includes: a housing 132 , in which the first coil 116 is disposed; an elastic member 134 , one end of the elastic member 134 is connected to the housing 132 , and the other end of the elastic member 134 is connected to the magnetic core 118 .

[0044] In the embodiment of the present application, the impedance tuner 102 further includes a housing 132, that is, the first coil 116 and the magnetic core 118 of the impedance tuner 102 can be disposed in the housing 132. By providing the housing 132, the first coil 116 and the magnetic core 118 can be protected to prevent the first coil 116 and the magnetic core 118 from being damaged by external impurities.

[0045] Furthermore, the impedance tuner 102 also includes an elastic member 134, one end of the elastic member 134 is connected to the housing 132, and the other end of the elastic member 134 is connected to the magnetic core 118. During the operation of the impedance tuning circuit 100, the control circuit 104 controls the magnitude of the current in the first coil 116, so that the magnetic field generated by the first coil 116 changes, and then the magnetic core 118 in the first coil 116 moves, so as to achieve the purpose of changing the inductance value of the impedance tuner 102. Through the setting of the elastic member 134, on the one hand, the movement of the magnetic core 118 can be limited to a certain extent, so as to prevent the magnetic core 118 from moving too far under the action of inertia. On the other hand, when the impedance tuning circuit 100 is not running, the magnetic core 118 can be reset through the elastic member 134, and the stability of the setting can also be ensured.

[0046] Specifically, the elastic member 134 may be a spring, one end of the spring is connected to the housing 132 , and the other end of the spring is connected to the magnetic core 118 .

[0047] In some embodiments of the present application, Figure 1 One of the structural schematic diagrams of the impedance tuning circuit of an embodiment of the present application is shown; Figure 3 FIG. 2 shows a second schematic diagram of the structure of the impedance tuning circuit according to an embodiment of the present application; Figure 1 and Figure 3As shown, the control circuit 104 includes: a collection unit 106, the collection unit 106 is connected to the transmission line 202, and is used to collect a first signal; a control unit 108, a first input end of the control unit 108 is connected to the collection unit 106, an output end of the control unit 108 is connected to the impedance tuner 102, and a second input end of the control unit 108 is connected to the output end of the control unit 108; wherein the first input end of the control unit 108 is used to receive the first signal collected by the collection unit 106, the second input end of the control unit 108 is used to receive the second signal output by the output end of the control unit 108, and the control unit 108 is used to control the operation of the impedance tuner 102 according to the first signal and the second signal.

[0048] In the embodiment of the present application, the control circuit 104 may include a collection unit 106 and a control unit 108, wherein the collection unit 106 is connected to the transmission line 202, so as to collect the first signal. Specifically, in the process of the transceiver 200 transmitting the radio frequency signal to the antenna 300, the collection unit 106 may receive the power signal reflected from the impedance tuner 102 to the transceiver 200, and then generate the first signal according to the power signal, and transmit the first signal to the control unit 108 through the first input terminal of the control unit 108.

[0049] Furthermore, after the first input end of the control unit 108 receives the first signal collected by the collection unit 106, the second signal is output through the output end of the control unit 108, and the output end of the control unit 108 is also connected to the second input end of the control unit 108, that is, the first input end of the control unit 108 inputs the first signal, and the second input end of the control unit 108 inputs the second signal, so that the control unit 108 can output according to the first signal and the second signal.

[0050] At the same time, the output end of the control unit 108 is also connected to the impedance tuner 102, that is, the two input ends of the control unit 108 respectively input the first signal and the second signal, and the output end of the control unit 108 is connected to the impedance tuner 102, so that the control unit 108 controls the operation of the impedance tuner 102 according to the first signal and the second signal, thereby realizing the tuning of the impedance between the transceiver 200 and the antenna 300 during the operation of the impedance tuner 102.

[0051] In some embodiments of the present application, Figure 1 and Figure 3 As shown, the acquisition unit 106 includes: a coupler 110, one end of the coupler 110 is connected to the transmission line 202; a detector 112, an input end of the detector 112 is connected to the other end of the coupler 110, and an output end of the detector 112 is connected to a first input end of the control unit 108.

[0052] In an embodiment of the present application, the acquisition unit 106 may include a coupler 110. Specifically, one end of the coupler 110 is connected to the transmission line 202. In this way, when the transceiver 200 sends a radio frequency signal to the antenna 300, the power signal reflected back from the transceiver 200 by the impedance tuner 102 can be coupled to the other end of the coupler 110 through one end of the coupler 110 when passing through the transmission line 202.

[0053] Furthermore, the acquisition unit 106 also includes a detector 112, and the input end of the detector 112 is connected to the other end of the coupler 110. That is, after the power signal reflected by the impedance tuner 102 is coupled to the other end of the coupler 110 through one end of the coupler 110, the power signal can be transmitted to the input end of the detector 112. Then, the detector 112 processes the power signal to convert the power signal into a first signal, thereby realizing the acquisition process of the first signal by the acquisition unit 106.

[0054] Specifically, the first signal may be a voltage signal, that is, the detector 112 can convert the power signal transmitted from the coupler 110 into a voltage signal.

[0055] In some embodiments of the present application, Figure 3 As shown, the control unit 108 includes: an error amplifier 114 , a first input end of the error amplifier 114 is connected to the output end of the acquisition unit 106 , the output end of the error amplifier 114 is connected to the impedance tuner 102 , and a second input end of the error amplifier 114 is connected to the output end of the error amplifier 114 .

[0056] In the embodiment of the present application, the control unit 108 may include an error amplifier 114, and a first input terminal of the error amplifier 114 is connected to an output terminal of the acquisition unit 106, so that the error amplifier 114 can receive the first signal collected by the acquisition unit 106 through the first input terminal. Further, the second input terminal of the error amplifier 114 is connected to the output terminal of the error amplifier 114, that is, when the error amplifier 114 receives the first signal, it can output a second signal at the output terminal, and then, the output terminal of the error amplifier 114 is connected to the second input terminal of the error amplifier 114, so that the error amplifier 114 can receive the second signal. Further, the output terminal of the error amplifier 114 is also connected to the impedance tuner 102, so that the error amplifier 114 can output a control signal to the impedance tuner 102 to control the operation of the impedance tuner 102 to achieve real-time tuning of the impedance matching between the transceiver 200 and the antenna 300.

[0057] Specifically, the first input terminal of the error amplifier 114 is connected to the output terminal of the detector 112, the first signal output by the detector 112 is input through the first input terminal of the error amplifier 114, and then the output terminal of the error amplifier 114 outputs the second signal, and the second signal is input to the error amplifier 114 through the second input terminal of the error amplifier 114. That is, the error amplifier 114 compares the magnitudes of the first signal and the second signal, and then outputs a control signal to the impedance tuner 102 according to the comparison result.

[0058] Exemplarily, the detector 112 can convert the power signal transmitted from the coupler 110 into a first voltage signal, and then output a second voltage signal through the error amplifier 114. Further, the error amplifier 114 compares the first voltage signal with the second voltage signal. If the first voltage signal is greater than the second voltage signal, it means that the power coupled to the coupler 110 is increasing, that is, the impedance mismatch between the transceiver 200 and the antenna 300 is gradually increasing. At this time, the error amplifier 114 can output a reverse voltage, that is, the power of the RF signal passing through the impedance tuner 102 is reduced, thereby gradually reducing the impedance mismatch between the transceiver 200 and the antenna 300. On the contrary, if the first voltage signal is less than the second voltage signal, the error amplifier 114 outputs a forward voltage, thereby increasing the power of the RF signal passing through the impedance tuner 102, so that the impedance mismatch between the transceiver 200 and the antenna 300 is gradually reduced. Furthermore, if the first voltage signal and the second voltage signal are equal, it indicates that the impedance matching degree between the transceiver 200 and the antenna 300 has reached an optimal state.

[0059] The embodiment of the present application further provides an electronic device 400, Figure 4 The structure block diagram of the electronic device according to the embodiment of the present application is shown as follows: Figure 4 As shown, the electronic device 400 includes the impedance tuning circuit 100 as in the above embodiment.

[0060] The electronic device 400 proposed in this embodiment has the impedance tuning circuit 100 as in any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An impedance tuning circuit for tuning the impedance between a transceiver and an antenna, wherein the transceiver and the antenna are connected via a transmission line, characterized in that: The impedance tuning circuit comprises: an impedance tuner connected in series between the transceiver and the antenna; a control circuit, wherein an input end of the control circuit is connected to the transmission line, and an output end of the control circuit is connected to the impedance tuner; The control circuit is used to control the operation of the impedance tuner according to a first signal input to the input end of the control circuit and a second signal output from the output end of the control circuit, so as to tune the impedance between the transceiver and the antenna.

2. The impedance tuning circuit according to claim 1, characterized in that: The impedance tuner comprises: A first coil, the first coil is connected in series between the transceiver and the antenna, and one end of the first coil is connected to an output end of the control circuit; a magnetic core, the magnetic core being movably inserted into the first coil; The control circuit is used to adjust the current in the first coil according to the first signal and the second signal to adjust the length of the portion of the magnetic core inserted into the first coil to tune the inductance value of the impedance tuner.

3. The impedance tuning circuit according to claim 2, characterized in that: Also includes: An isolation component is arranged on the transmission line, and is used to isolate the direct current between the transceiver and the control circuit, and is used to isolate the direct current between the antenna and the control circuit.

4. The impedance tuning circuit according to claim 3, characterized in that: The isolation assembly comprises: a first capacitor, one end of the first capacitor being connected to the transceiver, and the other end of the first capacitor being connected to the first coil; A second capacitor, one end of the second capacitor is connected to the antenna, and the other end of the second capacitor is connected to the first coil.

5. The impedance tuning circuit according to claim 4, characterized in that: Also includes: The filter component is arranged between the control circuit and the impedance tuner, and is used for filtering the radio frequency signal transmitted to the control circuit.

6. The impedance tuning circuit according to claim 5, characterized in that: The filtering component comprises: a first choke coil, one end of which is connected to the output end of the control circuit, and the other end of which is connected to one end of the first coil; A second choke coil, one end of which is connected to the other end of the first coil, and the other end of which is grounded.

7. The impedance tuning circuit according to claim 2, characterized in that: The impedance tuner further comprises: a housing, wherein the first coil is disposed in the housing; An elastic member, one end of which is connected to the shell, and the other end of which is connected to the magnetic core.

8. The impedance tuning circuit according to any one of claims 1 to 7, characterized in that: The control circuit comprises: a collection unit, the collection unit being connected to the transmission line and configured to collect the first signal; A control unit, wherein a first input end of the control unit is connected to the acquisition unit, an output end of the control unit is connected to the impedance tuner, and a second input end of the control unit is connected to an output end of the control unit; Among them, the first input end of the control unit is used to receive the first signal collected by the collection unit, the second input end of the control unit is used to receive the second signal output by the output end of the control unit, and the control unit is used to control the operation of the impedance tuner according to the first signal and the second signal.

9. The impedance tuning circuit according to claim 8, characterized in that: The acquisition unit comprises: a coupler, one end of which is connected to the transmission line; A detector, wherein an input end of the detector is connected to the other end of the coupler, and an output end of the detector is connected to the first input end of the control unit.

10. The impedance tuning circuit according to claim 8, characterized in that: The control unit comprises: An error amplifier, wherein a first input end of the error amplifier is connected to an output end of the acquisition unit, an output end of the error amplifier is connected to the impedance tuner, and a second input end of the error amplifier is connected to an output end of the error amplifier.

11. An electronic device, characterized in that: include: An impedance tuning circuit as claimed in any one of claims 1 to 10.

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