CN117538616A - Impedance detection method, impedance detection circuit and impedance detection device - Google Patents
Impedance detection method, impedance detection circuit and impedance detection device Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
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- G01R31/2822—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere of microwave or radiofrequency circuits
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Abstract
The application provides an impedance detection method, an impedance detection circuit and impedance detection equipment, which relate to the technical field of radio frequency, wherein the impedance detection method is applied to the impedance detection equipment and is used for detecting the impedance value of a radio frequency circuit and comprises the following steps: the control and adjustment unit is used for adjusting the reactance value of the adjustable reactance unit and detecting the current value of the impedance detection circuit through the detection unit; when the current of the impedance detection circuit reaches a peak value, the control and adjustment unit stops adjusting the reactance value of the adjustable reactance unit, further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, and detects the power value of the adjustable resistance unit through the detection unit; and correspondingly obtaining the impedance value of the radio frequency circuit based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value. The method and the device can dynamically detect the impedance value of the radio frequency circuit when the radio frequency circuit works.
Description
Technical Field
The present disclosure relates to the field of radio frequency technologies, and in particular, to an impedance detection method, an impedance detection circuit, and an impedance detection device.
Background
Currently, with the popularization of Radio Frequency (RF) applications, RF circuits are increasingly used in various fields. After the radio frequency circuit is built, dynamic parameters of the radio frequency circuit are often detected, so that the radio frequency circuit is regulated. However, the existing detection method cannot detect the dynamic parameters of the radio frequency circuit, especially the impedance value of the radio frequency circuit, under the static condition of the radio frequency circuit, so that the radio frequency circuit is difficult to adjust, and the damage of the radio frequency circuit is easy to cause. Therefore, how to dynamically detect the impedance value of the rf circuit while the rf circuit is operating becomes a problem to be considered.
Disclosure of Invention
The application provides an impedance detection method, an impedance detection circuit and impedance detection equipment, which can dynamically detect the impedance value of a radio frequency circuit when the radio frequency circuit works.
In a first aspect, an impedance detection method is provided, applied to an impedance detection device, for detecting an impedance value of the radio frequency circuit, where the impedance detection device includes an impedance detection circuit and a detection unit; the impedance detection circuit comprises an adjustable reactance unit, an adjustable resistance unit and an adjusting unit, wherein the adjustable reactance unit is connected in an output path of the radio frequency circuit and has an adjustable reactance value, the adjustable resistance unit and the adjustable reactance unit are connected in series in the output path of the radio frequency circuit and have an adjustable resistance value, and the adjusting unit is used for adjusting the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit; the impedance detection method comprises the following steps:
The control and adjustment unit is used for adjusting the reactance value of the adjustable reactance unit and detecting the current value of the impedance detection circuit through the detection unit;
when the current of the impedance detection circuit reaches a peak value, the control and adjustment unit stops adjusting the reactance value of the adjustable reactance unit, further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, and detects the power value of the adjustable resistance unit through the detection unit;
and correspondingly obtaining the impedance value of the radio frequency circuit based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value.
In one possible implementation manner, the impedance value of the radio frequency circuit includes a circuit reactance value Xs and a circuit resistance value Rs, the impedance value of the adjustable reactance unit when the current based on the impedance detection circuit reaches a peak value, and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches a peak value correspondingly obtain the impedance value of the radio frequency circuit, and the method includes:
obtaining a circuit reactance value Xs of the radio frequency circuit based on the reactance value correspondence of the adjustable reactance unit when the impedance detection circuit is at a current peak;
And obtaining a circuit resistance Rs of the radio frequency circuit based on the resistance value of the adjustable resistance unit when the adjustable resistance unit is at the power peak.
In a second aspect, an impedance detection circuit is further provided, and is configured to detect an impedance value of a radio frequency circuit, where the impedance detection circuit includes an adjustable reactance unit, an adjustable resistance unit, and an adjusting unit, where the adjustable reactance unit is connected to an output path of the radio frequency circuit and has an adjustable reactance value; the adjustable resistance unit and the adjustable reactance unit are connected in series in an output path of the radio frequency circuit and have adjustable resistance values; the adjusting unit is used for adjusting the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit; the adjusting unit firstly adjusts the reactance value of the adjustable reactance unit, when the current of the impedance detection circuit reaches a peak value, the adjusting unit stops adjusting the reactance value of the adjustable reactance unit and further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, wherein the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value, and the resistance value of the adjustable resistance unit is used for correspondingly obtaining the impedance value of the radio frequency circuit when the power of the adjustable resistance unit reaches the peak value.
In one possible implementation manner, the impedance value of the radio frequency circuit includes a circuit reactance value Xs and a circuit resistance value Rs, the circuit reactance value Xs of the radio frequency circuit is obtained based on the reactance value correspondence of the adjustable reactance unit when the impedance detection circuit is in a current peak, and the circuit resistance value Rs of the radio frequency circuit is obtained based on the resistance value correspondence of the adjustable resistance unit when the adjustable resistance unit is in a power peak.
In one possible implementation manner, the circuit reactance value xs= -Xr of the radio frequency circuit, where Xr is the reactance value of the adjustable reactance unit when the impedance detection circuit is at the current peak.
In one possible implementation, a circuit resistance value rs=rm of the radio frequency circuit, where Rm is a resistance value of the adjustable resistance unit at a power peak of the adjustable resistance unit.
In a possible embodiment, the adjustable reactance unit comprises at least a first adjustable inductance and a first adjustable capacitance, the first adjustable inductance being connected in series with the first adjustable capacitance, the adjustable reactance value comprising an adjustable inductance value and/or capacitance value, the adjustable resistance unit comprising at least a first adjustable resistance.
In one possible embodiment, the adjustment unit comprises a first adjustment module and a second adjustment module, the adjustment amplitude of each adjustment of the first adjustment module being greater than the adjustment amplitude of each adjustment of the second adjustment module.
In a third aspect, there is also provided an impedance detection apparatus including the above impedance detection circuit, the impedance detection apparatus further including a detection unit for detecting a current value of the impedance detection circuit and a power value of the adjustable resistance unit, and a control unit; the control unit is used for controlling the adjusting unit to firstly adjust the reactance value of the adjustable reactance unit until the power of the adjustable resistance unit reaches a peak value, and correspondingly obtaining the impedance value of the radio frequency circuit based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value. The impedance detection circuit comprises an adjustable reactance unit, an adjustable resistance unit and an adjusting unit, wherein the adjustable reactance unit is connected in an output path of the radio frequency circuit and has an adjustable reactance value; the adjustable resistance unit and the adjustable reactance unit are connected in series in an output path of the radio frequency circuit and have adjustable resistance values; the adjusting unit is used for adjusting the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit; the adjusting unit firstly adjusts the reactance value of the adjustable reactance unit, when the current of the impedance detection circuit reaches a peak value, the adjusting unit stops adjusting the reactance value of the adjustable reactance unit and further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, wherein the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value, and the resistance value of the adjustable resistance unit is used for correspondingly obtaining the impedance value of the radio frequency circuit when the power of the adjustable resistance unit reaches the peak value.
In one possible implementation manner, the detection unit includes a current detection module and a power detection module, the current detection module is connected to a current path of the impedance detection circuit and is used for detecting a current value of the impedance detection circuit, and the power detection module is connected to two ends of the adjustable resistance unit and is used for detecting a power value of the adjustable resistance unit.
According to the impedance detection method, the impedance detection circuit and the impedance detection equipment, the impedance value of the radio frequency circuit can be correspondingly obtained through the adjustable reactance unit and the adjustable resistance unit which are connected in series to the output path of the radio frequency circuit, and by adjusting the reactance value and the resistance value of the adjustable reactance unit and the adjustable resistance unit, according to the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches a peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value, the impedance value of the radio frequency circuit can be dynamically detected when the radio frequency circuit works.
Drawings
In order to more clearly describe the technical solutions in the embodiments or the background of the present application, the following description will describe the drawings that are required to be used in the embodiments or the background of the present application.
Fig. 1 is a flowchart of an impedance detection method according to an embodiment of the present application.
Fig. 2 is a flowchart of an impedance detection method according to another embodiment of the present application.
Fig. 3 is a schematic diagram of an impedance detection circuit according to an embodiment of the present application.
Fig. 4 is a circuit schematic diagram of the impedance detection circuit shown in fig. 3.
Fig. 5 is a schematic circuit diagram of an adjustable reactance unit according to an embodiment of the present application.
Fig. 6 is a schematic circuit diagram of an adjustable resistor unit according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of an adjusting unit in an embodiment of the present application.
Fig. 8 is a circuit schematic diagram of an impedance detecting apparatus according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a detection unit in an embodiment of the present application.
Fig. 10 is a circuit schematic diagram of an impedance detecting apparatus in a further embodiment of the present application.
Reference numerals illustrate: 1. impedance detection equipment 10, impedance detection circuit, I0, current value, P0, power value, 100, adjustable reactance unit, L1, first adjustable inductance, C1, first adjustable capacitance, L2, second adjustable inductance, C2, second adjustable capacitance, 200, adjustable resistance unit, RH1, first adjustable resistance, RH2, second adjustable resistance, 300, adjustment unit, 310, first adjustment module, 320, second adjustment module, 400, detection unit, 410, current detection module, 420, power detection module, 500, control unit, 20, radio frequency circuit.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.
In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the embodiments of the present application, it should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In describing embodiments of the present application, it should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above-described drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1 together, fig. 1 is a flowchart of an impedance detection method according to an embodiment of the present application. As shown in fig. 1, the present application provides an impedance detection method applied to an impedance detection device for detecting an impedance value of a radio frequency circuit, where the impedance detection device includes an impedance detection circuit and a detection unit; the impedance detection circuit comprises an adjustable reactance unit, an adjustable resistance unit and an adjusting unit, wherein the adjustable reactance unit is connected in an output path of the radio frequency circuit and has an adjustable reactance value, the adjustable resistance unit and the adjustable reactance unit are connected in series in the output path of the radio frequency circuit and have an adjustable resistance value, and the adjusting unit is used for adjusting the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit; the impedance detection method comprises the following steps:
Step S100: the control and adjustment unit is used for adjusting the reactance value of the adjustable reactance unit and detecting the current value of the impedance detection circuit through the detection unit;
step S200: when the current of the impedance detection circuit reaches a peak value, the control and adjustment unit stops adjusting the reactance value of the adjustable reactance unit, further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, and detects the power value of the adjustable resistance unit through the detection unit;
step S300: and correspondingly obtaining the impedance value of the radio frequency circuit based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value.
Therefore, according to the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value, the impedance value of the radio frequency circuit can be correspondingly obtained, so that the impedance value of the radio frequency circuit can be dynamically detected when the radio frequency circuit works.
Referring to fig. 2 together, fig. 2 is a flowchart of an impedance detection method according to another embodiment of the present application. As shown in fig. 1 and 2, the impedance value of the radio frequency circuit includes a circuit reactance value Xs and a circuit resistance value Rs, and step S300: based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches a peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches a peak value, correspondingly obtaining the impedance value of the radio frequency circuit, the method comprises the following steps:
Step S310: obtaining a circuit reactance value Xs of the radio frequency circuit based on the reactance value correspondence of the adjustable reactance unit when the impedance detection circuit is at a current peak;
step S320: and obtaining a circuit resistance Rs of the radio frequency circuit based on the resistance value of the adjustable resistance unit when the adjustable resistance unit is at the power peak.
Therefore, the reactance value of the adjustable reactance unit is corresponding to the reactance value Xs of the circuit of the radio frequency circuit when the impedance detection circuit is at the current peak, the resistance value of the adjustable resistance unit is corresponding to the resistance value Rs of the circuit of the radio frequency circuit when the adjustable resistance unit is at the power peak, and the impedance value of the radio frequency circuit can be correspondingly obtained based on the reactance value Xs of the circuit of the radio frequency circuit and the resistance value Rs of the circuit of the radio frequency circuit, so that the impedance value of the radio frequency circuit can be dynamically detected when the radio frequency circuit works.
The reactance value of the adjustable reactance unit is Xr when the impedance detection circuit is at a current peak value, the circuit reactance value xs= -Xr of the radio frequency circuit, the resistance value of the adjustable resistance unit is Rm when the impedance detection circuit is at a power peak value, and the circuit resistance value Rs=Rm of the radio frequency circuit.
According to the impedance detection method, the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit can be adjusted according to different change precision and adjustment amplitude, the current peak value of the impedance detection circuit and the power peak value of the adjustable resistance unit are prevented from being missed, and according to the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value, the impedance value of the radio frequency circuit can be correspondingly obtained, so that the impedance value of the radio frequency circuit can be dynamically detected when the radio frequency circuit works.
In one or more embodiments, the impedance detection apparatus further comprises a control unit, and the impedance detection method described above is controllable by the control unit.
Referring to fig. 3 and fig. 4 together, fig. 3 is a schematic structural diagram of an impedance detection circuit according to an embodiment of the present application, and fig. 4 is a schematic circuit diagram of the impedance detection circuit according to the present application as shown in fig. 3. As shown in fig. 3 and fig. 4, the present application further provides an impedance detection circuit 10 for detecting an impedance value of the radio frequency circuit 20, where the impedance detection circuit 10 includes an adjustable reactance unit 100, an adjustable resistance unit 200, and an adjusting unit 300, and the adjustable reactance unit 100 is connected to an output path of the radio frequency circuit 20 and has an adjustable reactance value; the adjustable resistance unit 200 and the adjustable reactance unit 100 are connected in series in the output path of the radio frequency circuit 20, and have adjustable resistance values; the adjusting unit 300 is used for adjusting the reactance value of the adjustable reactance unit 100 and the resistance value of the adjustable resistance unit 200; wherein the adjusting unit 300 adjusts the reactance value of the adjustable reactance unit 100 first, when the current of the impedance detecting circuit 10 reaches a peak value, the adjusting unit 300 stops adjusting the reactance value of the adjustable reactance unit 100, and further adjusts the resistance value of the adjustable resistance unit 200 until the power of the adjustable resistance unit 200 reaches a peak value, wherein the reactance value of the adjustable reactance unit 100 when the current of the impedance detecting circuit 10 reaches a peak value, and the resistance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches a peak value are used for correspondingly obtaining the impedance value of the radio frequency circuit 20.
Thus, in the impedance detection circuit 10 of the present application, by the adjustable reactance unit 100 and the adjustable resistance unit 200 connected in series to the output path of the radio frequency circuit 20, and by adjusting the reactance value and the resistance value of the adjustable reactance unit 100 and the adjustable resistance unit 200, the impedance value of the radio frequency circuit 20 can be obtained correspondingly according to the reactance value of the adjustable reactance unit 100 when the current of the impedance detection circuit 10 reaches the peak value and the resistance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches the peak value, so as to dynamically detect the impedance value of the radio frequency circuit 20 when the radio frequency circuit 20 is in operation.
In one or more embodiments, the rf circuit 20 may include only an rf power supply, only an rf power supply and an impedance matching network, and may further include other components such as an rf power supply, an impedance matching network, and a load, where the impedance detection circuit 10 of the present application may dynamically detect the impedance value of the rf circuit 20 when the rf circuit 20 is in operation.
In one or more embodiments, the adjustment unit 300 may be a rotation motor, the rotation shaft of which is connected to the adjustable reactance unit 100 and the adjustable resistance unit 200, respectively, and the reactance value and the resistance value of the adjustable reactance unit 100 and the adjustable resistance unit 200 connected to the rotation shaft of the rotation motor become larger or smaller when the rotation motor rotates.
Wherein, the rotation direction of the rotation motor includes a first direction and a second direction, the first direction is opposite to the second direction, when the rotation motor rotates in the first direction, the reactance value and the resistance value of the adjustable reactance unit 100 and the adjustable resistance unit 200 connected to the rotation shaft of the rotation motor may be increased, and correspondingly, when the rotation motor rotates in the second direction, the reactance value and the resistance value of the adjustable reactance unit 100 and the adjustable resistance unit 200 connected to the rotation shaft of the rotation motor are decreased. In addition, when the rotary motor rotates in the first direction, the reactance value and the resistance value of the adjustable reactance unit 100 and the adjustable resistance unit 200 connected to the rotary shaft of the rotary motor may also be reduced, and correspondingly, when the rotary motor rotates in the second direction, the reactance value and the resistance value of the adjustable reactance unit 100 and the adjustable resistance unit 200 connected to the rotary shaft of the rotary motor are increased.
In one or more embodiments, one end of the adjustable resistor unit 200 is connected to the adjustable reactance unit 100, the other end of the adjustable resistor unit 200 may be connected to the ground terminal of the radio frequency circuit 20, the other end of the adjustable resistor unit 200 may also be grounded, and the other end of the adjustable resistor unit 200 may also be connected to the ground terminal of the radio frequency circuit 20 and ground, respectively.
In one or more embodiments, the impedance value of the radio frequency circuit 20 includes a circuit reactance value Xs and a circuit resistance value Rs, where the circuit reactance value Xs of the radio frequency circuit 20 is obtained based on the reactance value of the adjustable reactance unit 100 when the impedance detection circuit 10 is at the peak current, and the circuit resistance value Rs of the radio frequency circuit 20 is obtained based on the resistance value of the adjustable resistance unit 200 when the adjustable resistance unit 200 is at the peak power.
Therefore, the reactance value of the adjustable reactance unit 100 corresponds to the circuit reactance value Xs of the radio frequency circuit 20 when the current peaks by the impedance detection circuit 10, and the resistance value of the adjustable resistance unit 200 corresponds to the circuit resistance value Rs of the radio frequency circuit 20 when the power peaks by the adjustable resistance unit 200, so that the impedance value of the radio frequency circuit 20 can be correspondingly obtained, and the impedance value of the radio frequency circuit 20 can be dynamically detected when the radio frequency circuit 20 works.
In one or more embodiments, the circuit reactance value xs= -Xr of the radio frequency circuit 20, where Xr is the reactance value of the tunable reactance unit 100 at the current peak of the impedance detection circuit 10.
Therefore, when the current of the impedance detection circuit 10 reaches the peak value, it indicates that the rf circuit 20 and the impedance detection circuit 10 are resonating together, and the reactance value Xr of the adjustable reactance unit 100 is conjugated with the circuit reactance value Xs of the rf circuit 20, so that the circuit reactance value Xs of the rf circuit 20 can be obtained correspondingly by using the resonance point of the rf circuit 20 and the impedance detection circuit 10 together.
It should be noted that, the rf circuit 20 and the impedance detecting circuit 10 are integrally resonant, the reactance value of the impedance detecting circuit 10 is conjugated with the circuit reactance value Xs of the rf circuit 20, and in the impedance detecting circuit 10 shown in fig. 4, the impedance detecting circuit 10 only includes the adjustable reactance unit 100 connected in series in the output path of the rf circuit 20, and the reactance value of the impedance detecting circuit 10 is equal to the reactance value of the adjustable reactance unit 100, so as to be convenient for indicating and calculating the circuit reactance value Xs of the rf circuit 20.
In one or more embodiments, the adjustment unit 300 adjusts the reactance value of the adjustable reactance unit 100, and when the current of the impedance detection circuit 10 increases, the circuit reactance value Xs > -Xr of the radio frequency circuit 20 is determined, and the adjustment unit 300 further adjusts the reactance value of the adjustable reactance unit 100. The adjusting unit 300 adjusts the reactance value of the adjustable reactance unit 100, determines that the circuit reactance value Xs of the radio frequency circuit 20 is < -Xr when the current of the impedance detecting circuit 10 decreases, and the adjusting unit 300 adjusts the reactance value of the adjustable reactance unit 100.
Thus, according to the change of the current of the impedance detection circuit 10, the adjustment of the reactance value of the adjustable reactance unit 100 by the adjustment unit 300 is simple, so that the current of the impedance detection circuit 10 reaches the peak value.
In one or more embodiments, the circuit resistance value rs=rm of the radio frequency circuit 20, where Rm is the resistance value of the adjustable resistance unit 200 at the power peak of the adjustable resistance unit 200.
Therefore, when the power of the adjustable resistance unit 200 reaches the peak value, it indicates that the rf circuit 20 is impedance-matched with the whole impedance detection circuit 10, and the resistance value Rm of the adjustable reactance unit 100 is equal to the circuit resistance value Rs of the rf circuit 20, and the circuit resistance value Rs of the rf circuit 20 can be obtained correspondingly by using the time of impedance matching of the rf circuit 20 and the whole impedance detection circuit 10.
In one or more embodiments, the adjustment unit 300 adjusts the resistance value of the adjustable resistance unit 200, and when the power of the adjustable resistance unit 200 increases, it is determined that the circuit resistance value Rs > Rm of the radio frequency circuit 20, and the adjustment unit 300 further adjusts the resistance value of the adjustable resistance unit 200. The adjusting unit 300 adjusts the resistance value of the adjustable resistance unit 200, determines that the circuit resistance value Rs < Rm of the radio frequency circuit 20 when the power of the adjustable resistance unit 200 is reduced, and the adjusting unit 300 adjusts the resistance value of the adjustable resistance unit 200.
Thus, according to the change of the power of the adjustable resistance unit 200, the adjustment of the resistance value of the adjustable resistance unit 200 by the adjustment unit 300 is simple, so that the power of the adjustable resistance unit 200 reaches a peak value.
As shown in fig. 4, the adjustable reactance unit 100 includes at least a first adjustable inductance L1 and a first adjustable capacitance C1, the first adjustable inductance L1 is connected in series with the first adjustable capacitance C1, the adjustable reactance value includes an adjustable inductance value and/or a capacitance value, and the adjustable resistance unit 200 includes at least a first adjustable resistance RH1.
Thus, the adjustable reactance unit 100 at least includes the first adjustable inductance L1 and the first adjustable capacitance C1, the adjustable resistance unit 200 at least includes the first adjustable resistance RH1, and the adjusting unit 300 adjusts the inductance value of the first adjustable inductance L1 and/or the capacitance value of the first adjustable capacitance C1, so as to adjust the reactance value of the adjustable reactance unit 100, and adjusts the resistance value of the first adjustable resistance RH1, so as to adjust the resistance value of the adjustable resistance unit 200.
According to the foregoing, when the circuit reactance value Xs of the radio frequency circuit 20 and the reactance value Xr of the adjustable reactance unit 100 are conjugated, the current of the impedance detection circuit 10 reaches a peak value, the reactance of the radio frequency circuit 20 and the impedance detection circuit 10 is zero, and the reactance properties of the radio frequency circuit 20 and the impedance detection circuit 10 are inductive or capacitive, which results in a decrease of the current value I0 of the impedance detection circuit 10. Thus, in one or more embodiments, for the adjustment of the first tunable inductance L1, the adjustment unit 300 increases the inductance value of the first tunable inductance L1, determines that the reactance property of the radio frequency circuit 20 and the whole impedance detection circuit 10 is capacitive when the current of the impedance detection circuit 10 increases, and the adjustment unit 300 further increases the inductance value of the first tunable inductance L1, determines that the reactance property of the radio frequency circuit 20 and the whole impedance detection circuit 10 is inductive when the current of the impedance detection circuit 10 decreases, and the adjustment unit 300 decreases the inductance value of the first tunable inductance L1. For the adjustment of the first adjustable capacitor C1, the adjusting unit 300 adjusts the capacitance value of the first adjustable capacitor C1, determines that the reactance attribute of the radio frequency circuit 20 and the whole impedance detection circuit 10 is inductive when the current of the impedance detection circuit 10 increases, and further adjusts the capacitance value of the first adjustable capacitor C1 by the adjusting unit 300, determines that the reactance attribute of the radio frequency circuit 20 and the whole impedance detection circuit 10 is capacitive when the current of the impedance detection circuit 10 decreases, and adjusts the capacitance value of the first adjustable capacitor C1 by the adjusting unit 300.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an adjustable reactance unit according to an embodiment of the present application. As shown in fig. 4 and 5, the adjustable reactance unit 100 further includes a second adjustable inductor L2 and a second adjustable capacitor C2, where the second adjustable inductor L2 and the second adjustable capacitor C2 are connected in series with the first adjustable capacitor C1, and the second adjustable inductor L2 and the first adjustable inductor L1 have different variation precision, and the second adjustable capacitor C2 and the first adjustable capacitor C1 have different variation precision, where the variation precision is that the adjusting unit 300 adjusts the inductance variation values of the first adjustable inductor L1 and the second adjustable inductor L2 or adjusts the capacitance variation values of the first adjustable capacitor C1 and the second adjustable capacitor C2 once.
Therefore, when the adjusting unit 300 adjusts the reactance value of the adjustable reactance unit 100 through the second adjustable inductance L2 with different accuracy from the first adjustable inductance L1 and through the second adjustable capacitance C2 with different accuracy from the first adjustable capacitance C1, the reactance value of the adjustable reactance unit 100 can be adjusted with different accuracy according to specific needs, so as to avoid missing the current peak value of the detection circuit.
Specifically, the higher the variation accuracy, the smaller the inductance variation value of the first adjustable inductance L1 and the second adjustable inductance L2 is adjusted once or the capacitance variation value of the first adjustable capacitance C1 and the second adjustable capacitance C2 is adjusted once. Conversely, the lower the variation accuracy is, the larger the inductance variation value of the first adjustable inductance L1 and the second adjustable inductance L2 is adjusted once or the capacitance variation value of the first adjustable capacitance C1 and the second adjustable capacitance C2 is adjusted once.
In one or more embodiments, the variation accuracy of the second adjustable inductance L2 is greater than the variation accuracy of the first adjustable inductance L1, the variation accuracy of the second adjustable capacitance C2 is greater than the variation accuracy of the first adjustable capacitance C1, the inductance value of the first adjustable inductance L1 and/or the capacitance value of the first adjustable capacitance C1 are adjusted by the adjusting unit 300, and the inductance value of the second adjustable inductance L2 and/or the capacitance value of the second adjustable capacitance C2 are further adjusted to obtain the current peak value of the impedance detecting circuit 10.
Therefore, the adjusting unit 300 adjusts the inductance value of the first adjustable inductor L1 and/or the capacitance value of the first adjustable capacitor C1, and further adjusts the inductance value of the second adjustable inductor L2 and/or the capacitance value of the second adjustable capacitor C2, so that the reactance value of the adjustable reactance unit 100 can be coarsely adjusted, and further fine adjustment is performed on the reactance value of the adjustable reactance unit 100, so that the situation that the accuracy of change is overlarge and the current peak value of the impedance detection circuit 10 is missed is avoided.
In one or more embodiments, the inductance value of the second tunable inductor L2 is different from that of the first tunable inductor L1, so that the accuracy of the change of the second tunable inductor L2 is different from that of the first tunable inductor L1, and the capacitance value of the second tunable capacitor C2 is different from that of the first tunable capacitor C1, so that the accuracy of the change of the second tunable capacitor C2 is different from that of the first tunable capacitor C1.
When the inductance value of the second adjustable inductor L2 is smaller than the inductance value of the first adjustable inductor L1, the variation accuracy of the second adjustable inductor L2 is greater than the variation accuracy of the first adjustable inductor L1, and when the capacitance value of the second adjustable capacitor C2 is smaller than the capacitance value of the first adjustable capacitor C1, the variation accuracy of the second adjustable capacitor C2 is greater than the variation accuracy of the first adjustable capacitor C1.
Referring to fig. 6, fig. 6 is a schematic circuit diagram of an adjustable resistor unit according to an embodiment of the disclosure. As shown in fig. 4 and 6, the adjustable resistor unit 200 further includes a second adjustable resistor RH2, where the second adjustable resistor RH2 is connected in series with the first adjustable resistor RH1, and the second adjustable resistor RH2 is different from the first adjustable resistor RH1 in terms of variation accuracy, where the variation accuracy is that the adjustment unit 300 adjusts the resistance variation values of the first adjustable resistor RH1 and the second adjustable resistor RH2 at a time.
Therefore, when the adjusting unit 300 adjusts the resistance value of the adjustable resistor unit 200, the resistance value of the adjustable resistor unit 200 can be adjusted with different accuracy according to specific needs by the second adjustable resistor RH2 with different accuracy from the first adjustable resistor RH1, so as to avoid missing the power peak value of the adjustable resistor unit 200.
Specifically, the higher the variation accuracy, the smaller the resistance variation value of the first and second adjustable resistors RH1 and RH2 is adjusted at a time. Conversely, the lower the variation accuracy, the larger the resistance variation value of the first and second adjustable resistors RH1 and RH2 is adjusted at a time.
In one or more embodiments, the accuracy of the variation of the second adjustable resistor RH2 is greater than that of the first adjustable resistor RH1, and the resistance value of the first adjustable resistor RH1 is adjusted by the adjusting unit 300, and the resistance value of the second adjustable resistor RH2 is further adjusted to obtain the power peak value of the adjustable resistor unit 200.
Therefore, the resistance value of the first adjustable resistor RH1 is adjusted by the adjusting unit 300, and the resistance value of the second adjustable resistor RH2 is further adjusted, so that the resistance value of the adjustable resistor unit 200 can be coarsely adjusted, and then the resistance value of the adjustable resistor unit 200 is further finely adjusted, thereby avoiding the overlarge variation precision and missing the power peak value of the adjustable resistor unit 200.
In one or more embodiments, the resistance values of the second adjustable resistor RH2 and the first adjustable resistor RH1 are different, so that the accuracy of the variation of the second adjustable resistor RH2 and the first adjustable resistor RH1 is different.
When the resistance value of the second adjustable resistor RH2 is smaller than that of the first adjustable resistor RH1, the variation accuracy of the second adjustable resistor RH2 is greater than that of the first adjustable resistor RH 1.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an adjusting unit according to an embodiment of the present application. As shown in fig. 4 and 7, the adjusting unit 300 includes a first adjusting module 310 and a second adjusting module 320, and an adjusting amplitude of each adjustment of the first adjusting module 310 is larger than an adjusting amplitude of each adjustment of the second adjusting module 320.
Therefore, the adjustment amplitude of each adjustment of the first adjustment module 310 is larger than that of each adjustment of the second adjustment module 320, so that when the adjustment unit 300 adjusts the reactance value of the adjustable reactance unit 100, the reactance value of the adjustable reactance unit 100 can be adjusted with different adjustment amplitudes, and the current peak value of the impedance detection circuit 10 is prevented from being missed. And when the adjusting unit 300 adjusts the resistance value of the adjustable resistor unit 200, the resistance value of the adjustable resistor unit 200 can be adjusted with different adjusting amplitudes, so as to avoid missing the power peak value of the adjustable resistor unit 200.
In one or more embodiments, in the process of adjusting the reactance value of the adjustable reactance unit 100 by the adjusting unit 300, to adjust the reactance value of the adjustable reactance unit 100 by the first adjusting module 310, then further adjust the reactance value of the adjustable reactance unit 100 by the second adjusting module 320, to obtain the current peak value of the impedance detecting circuit 10. Therefore, the reactance value of the adjustable reactance unit 100 is adjusted by the first adjusting module 310, the reactance value of the adjustable reactance unit 100 can be coarse-adjusted first, and then the reactance value of the adjustable reactance unit 100 is further fine-adjusted by the second adjusting module 320, so that the condition that the adjustment amplitude is too large and the current peak value of the impedance detection circuit 10 is missed is avoided.
In one or more embodiments, in the process of adjusting the resistance value of the adjustable resistance unit 200 by the adjusting unit 300, the resistance value of the adjustable resistance unit 200 is adjusted by the first adjusting module 310, and then the resistance value of the adjustable resistance unit 200 is further adjusted by the second adjusting module 320, so as to obtain the power peak value of the adjustable resistance unit 200.
Therefore, the first adjusting module 310 adjusts the resistance value of the adjustable resistor unit 200 first, so that the resistance value of the adjustable resistor unit 200 can be coarsely adjusted first, and then the second adjusting module 320 further adjusts the resistance value of the adjustable resistor unit 200 finely, so that the condition that the adjusting amplitude is overlarge and the power peak value of the adjustable resistor unit 200 is missed is avoided.
In one or more embodiments, the first adjustment module 310 and the second adjustment module 320 may each be a rotating motor.
In one or more embodiments, the impedance detection circuit 10 may include both the first adjustable inductance L1, the first adjustable capacitance C1, the second adjustable inductance L2, and the second adjustable capacitance C2 as shown in fig. 5, the first adjustable resistance RH1 and the second adjustable resistance RH2 as shown in fig. 6, and the first adjustment module 310 and the second adjustment module 320 as shown in fig. 7.
Therefore, the adjustable reactance unit 100 and the adjustable resistance unit 200 can be finely adjusted in a plurality of adjustment modes, with different change precision and different adjustment amplitudes, and the current peak value of the impedance detection circuit 10 and the power peak value of the adjustable resistance unit 200 are prevented from being missed.
According to the impedance detection method and the impedance detection circuit 10, the impedance value of the adjustable reactance unit 100 and the impedance value of the adjustable resistance unit 200 can be adjusted with different change precision and adjustment amplitude, the current peak value of the impedance detection circuit 10 and the power peak value of the adjustable resistance unit 200 are prevented from being missed, and according to the impedance value of the adjustable reactance unit 100 when the current of the impedance detection circuit 10 reaches the peak value and the impedance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches the peak value, the impedance value of the radio frequency circuit 20 can be correspondingly obtained, so that the impedance value of the radio frequency circuit 20 can be dynamically detected when the radio frequency circuit 20 works.
As shown in fig. 8, the present application further provides an impedance detecting apparatus 1, where the impedance detecting apparatus 1 includes the impedance detecting circuit 10 in any of the foregoing embodiments, and the impedance detecting apparatus 1 further includes a detecting unit 400 and a control unit 500, where the detecting unit 400 is configured to detect a current value I0 of the impedance detecting circuit 10 and a power value P0 of the adjustable resistance unit 200; the control unit 500 is configured to control the adjusting unit 300 to adjust the reactance value of the adjustable reactance unit 100 first, and when the current of the impedance detecting circuit 10 reaches a peak value, control the adjusting unit 300 to stop adjusting the reactance value of the adjustable reactance unit 100, and further adjust the resistance value of the adjustable resistance unit 200 until the power of the adjustable resistance unit 200 reaches the peak value, and correspondingly obtain the impedance value of the radio frequency circuit 20 based on the reactance value of the adjustable reactance unit 100 when the current of the impedance detecting circuit 10 reaches the peak value and the resistance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches the peak value.
The impedance detecting apparatus 1 may be an impedance detecting apparatus to which the aforementioned impedance detecting method is applied.
The impedance detection circuit 10 includes an adjustable reactance unit 100, an adjustable resistance unit 200, and an adjusting unit 300, where the adjustable reactance unit 100 is connected to the output path of the radio frequency circuit 20 and has an adjustable reactance value; the adjustable resistance unit 200 and the adjustable reactance unit 100 are connected in series in the output path of the radio frequency circuit 20, and have adjustable resistance values; the adjusting unit 300 is used for adjusting the reactance value of the adjustable reactance unit 100 and the resistance value of the adjustable resistance unit 200; wherein the adjusting unit 300 adjusts the reactance value of the adjustable reactance unit 100 first, when the current of the impedance detecting circuit 10 reaches a peak value, the adjusting unit 300 stops adjusting the reactance value of the adjustable reactance unit 100, and further adjusts the resistance value of the adjustable resistance unit 200 until the power of the adjustable resistance unit 200 reaches a peak value, wherein the reactance value of the adjustable reactance unit 100 when the current of the impedance detecting circuit 10 reaches a peak value, and the resistance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches a peak value are used for correspondingly obtaining the impedance value of the radio frequency circuit 20.
The more specific structure of the impedance detection circuit 10 can be seen in any of the above embodiments, and the details of the impedance detection circuit 10 are not described herein.
Accordingly, the current value I0 of the impedance detection circuit 10 and each power value P0 when the adjustable resistance unit 200 is at each resistance value are detected by the detection unit 400, and the reactance value of the adjustable reactance unit 100 and the resistance value of the adjustable resistance unit 200 are adjusted by the control unit 500 control the adjustment unit 300, and the impedance value of the radio frequency circuit 20 can be correspondingly obtained according to the reactance value of the adjustable reactance unit 100 when the current of the impedance detection circuit 10 reaches the peak value and the resistance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches the peak value, so that the impedance value of the radio frequency circuit 20 is dynamically detected when the radio frequency circuit 20 is operated.
In particular, the detection unit 400 may be used as a part of the impedance detection circuit 10 to detect the current value I0 of the impedance detection circuit 10 and the power value P0 of the adjustable resistor unit 200.
Specifically, the control unit 500 adjusts the reactance value of the adjustable reactance unit 100 and the resistance value of the adjustable resistance unit 200 by controlling the adjusting unit 300 to obtain the reactance value of the adjustable reactance unit 100 when the current of the impedance detecting circuit 10 reaches the peak value, and the resistance value of the adjustable resistance unit 200 when the power of the adjustable resistance unit 200 reaches the peak value, so as to correspondingly obtain the impedance value of the radio frequency circuit 20.
In one or more embodiments, when the adjustment unit 300 is a rotary motor, the control unit 500 adjusts the reactance value of the adjustable reactance unit 100 and the resistance value of the adjustable resistance unit 200 connected to the rotary shaft of the rotary motor by controlling the rotation direction and the number of rotations or a specific rotation angle of the rotary motor.
In one or more embodiments, the control unit 500 is further configured to control the adjusting unit 300 to increase the reactance value of the adjustable reactance unit 100, and detect, by the detecting unit 400, the current value I0 of the impedance detecting circuit 10, and when the current of the impedance detecting circuit 10 increases, control the adjusting unit 300 to further increase the reactance value of the adjustable reactance unit 100, and when the current of the impedance detecting circuit 10 decreases, control the adjusting unit 300 to decrease the reactance value of the adjustable reactance unit 100.
In one or more embodiments, the control unit 500 is further configured to control the adjusting unit 300 to increase the resistance value of the adjustable resistance unit 200, and detect the power value P0 of the adjustable resistance unit 200 through the detecting unit 400, when the power of the adjustable resistance unit 200 increases, control the adjusting unit 300 to further increase the resistance value of the adjustable resistance unit 200, and when the power of the adjustable resistance unit 200 decreases, control the adjusting unit 300 to decrease the resistance value of the adjustable resistance unit 200.
In one or more embodiments, the control unit 500 may be a general-purpose processor such as a central processing unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, a discrete gate logic device, a logic control device such as a transistor logic device, or a microprocessor such as a micro control unit (Micro Control Unit, MCU).
Referring to fig. 9, fig. 9 is a schematic structural diagram of a detecting unit according to an embodiment of the present application. As shown in fig. 8 and 9, the detection unit 400 includes a current detection module 410 and a power detection module 420, the current detection module 410 is configured to detect a current value I0 of the impedance detection circuit 10, and the power detection module 420 is configured to detect a power value P0 of the adjustable resistance unit 200.
Thus, the current value I0 of the impedance detection circuit 10 and the power value P0 of the adjustable resistance unit 200 are detected by the current detection module 410 and the power detection module 420.
Referring to fig. 10 together, fig. 10 is a schematic circuit diagram of an impedance detecting apparatus according to another embodiment of the present application. As shown in fig. 8, 9 and 10, the current detection module 410 is connected to the output path of the radio frequency circuit 20, and the power detection module 420 is connected to two ends of the adjustable resistor unit 200 in parallel, wherein the current detection module 410 is an ammeter, and the power detection module 420 is a power meter.
Accordingly, the current value I0 of the impedance detection circuit 10 and the power value P0 of the adjustable resistor unit 200 are conveniently detected in real time by using the current detection module 410 as an ammeter and the power detection module 420 as a power meter.
According to the impedance detection method, the impedance detection circuit 10 and the impedance detection device 1, through the method and the structure, the current value I0 of the impedance detection circuit 10 and the power value P0 of the adjustable resistor unit 200 are detected through the detection unit 400, and the reactance value of the adjustable resistor unit 100 and the resistance value of the adjustable resistor unit 200 are regulated through the control unit 500 control regulating unit 300, so that the reactance value of the adjustable resistor unit 100 and the resistance value of the adjustable resistor unit 200 can be regulated with different variation precision and regulation amplitude, the current peak of the impedance detection circuit 10 and the power peak of the adjustable resistor unit 200 are prevented from being missed, and according to the reactance value of the adjustable resistor unit 100 when the current of the impedance detection circuit 10 reaches the peak value and the resistance value of the adjustable resistor unit 200 when the power of the adjustable resistor unit 200 reaches the peak value, the impedance value of the radio frequency circuit 20 can be correspondingly obtained, and the impedance value of the radio frequency circuit 20 can be dynamically detected when the radio frequency circuit 20 works.
The foregoing description is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and should be covered in the scope of the present application; embodiments of the present application and features of embodiments may be combined with each other without conflict. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An impedance detection method is characterized by being applied to an impedance detection device for detecting an impedance value of a radio frequency circuit, wherein the impedance detection device comprises an impedance detection circuit and a detection unit;
the impedance detection circuit comprises an adjustable reactance unit, an adjustable resistance unit and an adjusting unit, wherein the adjustable reactance unit is connected in an output path of the radio frequency circuit and has an adjustable reactance value, the adjustable resistance unit and the adjustable reactance unit are connected in series in the output path of the radio frequency circuit and have an adjustable resistance value, and the adjusting unit is used for adjusting the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit;
The impedance detection method comprises the following steps:
the control and adjustment unit is used for adjusting the reactance value of the adjustable reactance unit and detecting the current value of the impedance detection circuit through the detection unit;
when the current of the impedance detection circuit reaches a peak value, the control and adjustment unit stops adjusting the reactance value of the adjustable reactance unit, further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, and detects the power value of the adjustable resistance unit through the detection unit;
and correspondingly obtaining the impedance value of the radio frequency circuit based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value.
2. The method of claim 1, wherein the impedance value of the radio frequency circuit includes a circuit reactance value Xs and a circuit resistance value Rs, the impedance value of the adjustable reactance unit when the current based on the impedance detection circuit reaches a peak value, and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches a peak value, correspondingly obtaining the impedance value of the radio frequency circuit, includes:
obtaining a circuit reactance value Xs of the radio frequency circuit based on the reactance value correspondence of the adjustable reactance unit when the impedance detection circuit is at a current peak;
And obtaining a circuit resistance Rs of the radio frequency circuit based on the resistance value of the adjustable resistance unit when the adjustable resistance unit is at the power peak.
3. An impedance detection circuit for detecting an impedance value of a radio frequency circuit, comprising:
the adjustable reactance unit is connected in the output path of the radio frequency circuit and has an adjustable reactance value;
the adjustable resistance unit is connected in series with the adjustable reactance unit in an output path of the radio frequency circuit and has an adjustable resistance value;
the adjusting unit is used for adjusting the reactance value of the adjustable reactance unit and the resistance value of the adjustable resistance unit;
the adjusting unit firstly adjusts the reactance value of the adjustable reactance unit, when the current of the impedance detection circuit reaches a peak value, the adjusting unit stops adjusting the reactance value of the adjustable reactance unit and further adjusts the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, wherein the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value, and the resistance value of the adjustable resistance unit is used for correspondingly obtaining the impedance value of the radio frequency circuit when the power of the adjustable resistance unit reaches the peak value.
4. The impedance detection circuit of claim 3 wherein the impedance value of the radio frequency circuit comprises a circuit reactance value Xs and a circuit resistance value Rs, the circuit reactance value Xs of the radio frequency circuit being derived based on the reactance value of the adjustable reactance unit when the impedance detection circuit is at a peak current, the circuit resistance value Rs of the radio frequency circuit being derived based on the resistance value of the adjustable resistance unit when the adjustable resistance unit is at a peak power.
5. The impedance detection circuit of claim 4 wherein the radio frequency circuit has a circuit reactance value xs= -Xr, where Xr is the reactance value of the adjustable reactance unit at the peak current of the impedance detection circuit.
6. The impedance detection circuit of claim 4 wherein the radio frequency circuit has a circuit resistance value Rs = Rm, where Rm is the resistance value of the adjustable resistive element at the peak power level of the adjustable resistive element.
7. An impedance detection circuit according to claim 3, wherein the adjustable reactance unit comprises at least a first adjustable inductance and a first adjustable capacitance, the first adjustable inductance being connected in series with the first adjustable capacitance, the adjustable reactance value comprising an adjustable inductance value and/or capacitance value, the adjustable resistance unit comprising at least a first adjustable resistance.
8. The impedance detection circuit of claim 3 wherein the adjustment unit comprises a first adjustment module and a second adjustment module, the adjustment amplitude of each adjustment of the first adjustment module being greater than the adjustment amplitude of each adjustment of the second adjustment module.
9. An impedance detecting device comprising the impedance detecting circuit according to any one of claims 3-8, the impedance detecting device further comprising:
a detection unit for detecting a current value of the impedance detection circuit and a power value of the adjustable resistance unit;
the control unit is used for controlling the adjusting unit to firstly adjust the reactance value of the adjustable reactance unit, controlling the adjusting unit to stop adjusting the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches a peak value, further adjusting the resistance value of the adjustable resistance unit until the power of the adjustable resistance unit reaches the peak value, and correspondingly obtaining the impedance value of the radio frequency circuit based on the reactance value of the adjustable reactance unit when the current of the impedance detection circuit reaches the peak value and the resistance value of the adjustable resistance unit when the power of the adjustable resistance unit reaches the peak value.
10. The impedance detecting apparatus according to claim 9, wherein the detecting unit includes a current detecting module connected in a current path of the impedance detecting circuit for detecting a current value of the impedance detecting circuit, and a power detecting module connected to both ends of the adjustable resistance unit for detecting a power value of the adjustable resistance unit.
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| Publication number | Publication date |
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| CN117538616B (en) | 2024-04-23 |
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