CN112858787A - Impedance detection circuit, apparatus and method - Google Patents
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- 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
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
An impedance detection circuit, apparatus and method, wherein the impedance detection circuit comprises: the device comprises a detection signal module, a radio frequency isolation module, a frequency selection module, a signal amplification module and a processing module; the radio frequency isolation module is respectively connected with the detection signal module and the frequency selection module, the load to be detected is respectively connected with the radio frequency isolation module and the frequency selection module, and the signal amplification module is respectively connected with the frequency selection module and the processing module; the radio frequency generating circuit sends a radio frequency energy signal and is connected with the radio frequency isolation module, the load to be detected and the frequency selection module, the radio frequency isolation module prevents the radio frequency energy signal from being input into the detection signal module, the frequency selection module filters the radio frequency energy signal and allows the impedance detection signal to pass, the processing module calculates the impedance value of the load to be detected according to the voltage value of the impedance detection signal, and therefore accuracy of impedance detection can be improved.
Description
Technical Field
The embodiment of the application relates to the technical field of electronics, in particular to an impedance detection circuit, an impedance detection device and an impedance detection method.
Background
The radio frequency ablation technology is to precisely deliver radio frequency energy to a target area under the guidance of an image and ablate an object to be ablated. In the ablation process, the impedance value of the smiling target changes along with the ablation process, the impedance value needs to be calculated, the ablation effect is monitored in real time, and the success rate and the safety of ablation are improved.
In the prior art, the measurement of the impedance value cannot be completed before the radio frequency ablation, and the detection circuit of the impedance value is not independent of the radio frequency energy output circuit, so that the interference of a radio frequency signal to the detection of the impedance value cannot be avoided, the difficulty of the detection of the impedance value is increased, the detection accuracy is reduced, the inconvenience and the rapidness of the radio frequency ablation operation are caused, and the safety risk is increased.
Disclosure of Invention
The embodiment of the application provides an impedance detection circuit, an impedance detection device and an impedance detection method, which can realize that an impedance detection signal is independent of radio frequency signal transmission, thereby avoiding interference of the radio frequency signal and improving the accuracy of detecting the impedance value of an external load.
An aspect of an embodiment of the present application provides an impedance detection circuit, including:
the device comprises a detection signal module, a radio frequency isolation module, a frequency selection module, a signal amplification module and a processing module;
the radio frequency isolation module is respectively connected with the detection signal module and the frequency selection module, a load to be detected is respectively connected with the radio frequency isolation module and the frequency selection module, and the signal amplification module is respectively connected with the frequency selection module and the processing module;
the radio frequency generating circuit for sending a radio frequency energy signal is connected with the radio frequency isolating module, the load to be detected and the frequency selection module, the radio frequency isolating module is used for preventing the radio frequency energy signal from being input into the detection signal module which sends a preset frequency impedance detection signal, the frequency selection module is used for filtering the radio frequency energy signal and transmitting the impedance detection signal to the signal amplification module after voltage division, the signal amplification module amplifies the impedance detection signal after voltage division and transmits the impedance detection signal to the processing module, and the processing module calculates the impedance value of the load to be detected according to the voltage value of the amplified impedance detection signal.
An aspect of the embodiments of the present application further provides an impedance detection apparatus, including the impedance detection circuit as described above.
An aspect of the embodiments of the present application further provides an impedance detection method, where detecting an impedance value of a load to be detected by using the impedance detection circuit includes:
the control detection signal module outputs an alternating current detection signal with preset frequency, and the alternating current detection signal passes through the radio frequency isolation module, the frequency selection module and the signal amplification module and is output to the processing module;
controlling a radio frequency generating circuit to send a radio frequency energy signal, wherein the radio frequency energy signal is input from the connection position of the radio frequency generating circuit and a radio frequency isolation module, the load to be detected and a frequency selection module;
the radio frequency isolation module is used for preventing the radio frequency energy signal from being input into the detection signal module, the frequency selection module is used for filtering the radio frequency energy signal and dividing the impedance detection signal, the divided impedance detection signal is transmitted to the signal amplification module to be amplified and then transmitted to the processing module, and the processing module is controlled to calculate the impedance value of the load to be detected according to the amplified voltage value of the impedance detection signal.
As can be seen from the foregoing embodiments of the present application, a detection signal module in the impedance detection circuit outputs an impedance detection signal, and the impedance detection signal is processed by the radio frequency isolation module, the frequency selection module, and the signal amplification module and then output to the processing module; the radio frequency generating circuit outputs a radio frequency energy signal, the radio frequency energy signal is input from one end of a load to be detected, a radio frequency isolating module and a frequency selecting module, the radio frequency isolating module isolates the radio frequency energy signal and prevents the radio frequency energy signal from being input to a detection signal module, the frequency selecting module absorbs the radio frequency energy signal and allows an impedance detection signal to pass through, after the radio frequency energy signal is processed by a signal amplifying module, the processing module can calculate the impedance value of the load to be detected according to the voltage value of the detected impedance detection signal reaching the processing module, the impedance detecting circuit can be independent from the radio frequency generating circuit, so that the impedance detection signal is not interfered by the radio frequency energy signal when the radio frequency energy signal is input, the accuracy of impedance detection is improved, the detection of the impedance value can be completed before the radio frequency operation, and a reference basis is provided for other parameters needing to be controlled in the radio frequency operation in advance, the convenience of radio frequency operation is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an impedance detection circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit structure diagram of an impedance detection circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit schematic diagram of an impedance detection circuit according to an embodiment of the present application;
fig. 4 is a schematic flowchart of an impedance detection method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specifically, referring to fig. 1, a schematic structural diagram of an impedance detection circuit provided in an embodiment of the present application is shown. As shown in fig. 1, the impedance detection circuit specifically includes:
the device comprises a detection signal module 10, a radio frequency isolation module 20, a frequency selection module 30, a signal amplification module 40 and a processing module 50;
the detection signal module 10 is connected to the radio frequency isolation module 20, and the detection signal module 10 is configured to send an impedance detection signal with a preset frequency under the control of a controller such as an mcu (microcontroller unit) or a single chip microcomputer, where the impedance detection signal is an ac signal in the form of a triangular wave.
The rf isolation module 20 is further connected to an rf generating circuit 60 for generating rf energy signals, and the rf isolation module 20 has a filtering function, so as to prevent the rf energy signals from entering the detection signal module 10, and interfere and damage the circuit, and simultaneously convert the impedance detection signals into sine wave signals that are harmless to human body.
The radio frequency isolation module 20 and the radio frequency generation circuit 60 are both connected to the frequency selection module 30, the radio frequency isolation module 20 is further connected to the signal amplification module 40, the signal amplification module 40 is further connected to the processing module 50, the impedance detection circuit is connected to the outside of the load to be detected, and the impedance detection circuit is respectively connected to the radio frequency isolation module 20, the radio frequency generation circuit 60 and the frequency selection module 30.
Specifically, the frequency selection module 30 has a higher impedance for the impedance detection signal, which can normally pass through, and a lower impedance for the rf energy signal, which filters the rf energy signal, so as to prevent the impedance detection signal from being interfered by the rf energy signal when entering the signal amplification module 40. The radio frequency isolation module 20 divides the voltage of the impedance detection signal and transmits the divided impedance detection signal to the signal amplification module 40, the signal amplification module 40 amplifies the divided impedance detection signal, and the processing module 50 is configured to detect a voltage value of the amplified impedance detection signal and calculate an impedance value of the load to be detected according to a preset calculation formula according to the voltage value.
In the embodiment of the application, a detection signal module in an impedance detection circuit outputs an impedance detection signal, and the impedance detection signal is processed by a radio frequency isolation module, a frequency selection module and a signal amplification module and then output to a processing module; the radio frequency generating circuit outputs a radio frequency energy signal, the radio frequency energy signal is input from one end of a load to be detected, a radio frequency isolating module and a frequency selecting module, the radio frequency isolating module isolates the radio frequency energy signal and prevents the radio frequency energy signal from being input to a detection signal module, the frequency selecting module absorbs the radio frequency energy signal and allows an impedance detection signal to pass through, after the radio frequency energy signal is processed by a signal amplifying module, the processing module can calculate the impedance value of the load to be detected according to the voltage value of the detected impedance detection signal reaching the processing module, the impedance detecting circuit can be independent from the radio frequency generating circuit, so that the impedance detection signal is not interfered by the radio frequency energy signal when the radio frequency energy signal is input, the accuracy of impedance detection is improved, the detection of the impedance value can be completed before the radio frequency operation, and a reference basis is provided for other parameters needing to be controlled in the radio frequency operation in advance, the convenience of radio frequency operation is greatly improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an impedance detection circuit according to another embodiment of the present application.
Specifically, the frequency selection module 30 includes a first resistor circuit R1 (shown in fig. 2 as a resistor label for simplicity) and a resonant circuit.
The first resistor circuit R1 includes a plurality of resistors connected in series, specifically referring to fig. 3, fig. 3 is a circuit schematic diagram of the impedance detection circuit, preferred values of components in the impedance detection circuit are all labeled in fig. 3, the plurality of resistors connected in series preferably include R9, R10 and R11 in fig. 3, one end of the first resistor circuit R1 (i.e., the end where R9 is located) is connected to the radio frequency generation circuit 60, the radio frequency generation circuit receives the radio frequency energy signal, and the other end of the first resistor circuit R1 is connected to the resonant circuit.
The resonant circuit is specifically an LC resonant circuit, and is used for frequency selection, so that the impedance detection signal of the resonant frequency normally passes through, and is output to the signal amplification module 40 of the rear pole for operation processing, and the non-resonant signal is absorbed and attenuated to avoid interference with the impedance detection signal. The LC resonant circuit is formed by connecting an inductor L and a capacitor C in parallel, specifically C8 and L12, and C9 and L13 in fig. 3.
The radio frequency isolation module 20 includes a second resistor circuit R2 (shown in fig. 2 as a resistor label) and a band-reject filter circuit.
Wherein the second resistor circuit R2 comprises a plurality of resistors connected in series, preferably R7 and R8 in fig. 3. The band-stop filter circuit is specifically an LC band-stop filter circuit and comprises an inductor L and a capacitor C1 which are connected in parallel in FIG. 2, namely an inductor L11 and a capacitor C5 in FIG. 3. The LC band-stop filter circuit can prevent radio frequency ablation energy from entering the detection signal module 10 which sends out the impedance detection signal through the LC band-stop filter circuit, interference and damage are formed on the circuit, and meanwhile, the impedance detection signal is processed into a safe sine wave signal which is not damaged by a human body.
One end (namely the end where the R8 is located) of the second resistor circuit R2 is connected with the radio frequency generating circuit 60, the radio frequency energy signal is accessed, and is connected with one end (namely the end where the R9 is located) of the first resistor circuit R1, and the other end (namely the other end where the R7 is located) of the second resistor circuit R2 is connected with the LC band elimination filter circuit.
Further, the other end of the LC band-stop filter circuit is connected to the detection signal module 10, and the detection signal module 10 includes: a square wave signal module 11 and a filtering module 12. The square wave signal module 11 is connected to the filtering module 12 for generating the impedance detection signal, and the impedance detection signal with a preset frequency sent by the square wave signal module 11 is a square wave signal, preferably 5V (volt). The predetermined frequency is preferably 50 KHZ.
The square wave signal module 11 includes a square wave signal source 13 and an inverter IC, where the inverter IC is an inverter U12C in fig. 3, and the specific model is 74HC 04D;
the inverter IC is connected to the square wave signal source 13 and the filter module 12, and the inverter IC inverts a phase of the impedance detection signal in the form of a square wave generated by the square wave signal source 13 and transmits the inverted phase to the filter module 12.
The filter module 12 comprises a band-pass filter circuit, which may be in particular an RC band-pass filter circuit, preferably comprising C3, R5, R6 and C4 in fig. 3, connected to the inverter IC and the LC band-stop filter circuit, in particular for processing the impedance detection signal from a square wave signal to an alternating signal in the form of a triangular wave. Among them, C3 and R5 constitute a differentiating circuit that reduces the voltage value of the impedance detection signal, preferably from 5V to 500mv (millivolts) in peak-to-peak voltage.
As shown in fig. 2, the load R3 to be tested is externally connected to the impedance detection circuit, as shown in fig. 2 and fig. 3, R3 is respectively connected to the resistor R8 of the RF isolation module 20, the RF generation circuit 60 (i.e., RF _ P in fig. 3) and the frequency selection module 30, and as shown in fig. 3, a capacitor C6 is further connected between the frequency selection module 30 and the RF generation circuit 60.
Further, a filter capacitor C2 is connected between the second resistor circuit R2 and the resonant circuit, specifically, between R11 and the resonant circuit, and C2 is C7 in fig. 3.
Further, the signal amplifying module 40 includes an amplifier circuit, which is mainly composed of a resistor, a capacitor and a signal amplifier, and is used for amplifying and filtering the input impedance detection signal.
The processing module 50 is specifically a device capable of performing data processing, such as a single chip microcomputer or an MCU, and is configured to calculate an impedance value of the to-be-detected impedance R3 according to the parameter of the impedance detection circuit and the detected voltage value of the impedance detection signal output from the signal amplification module 40. The calculation process is as follows with reference to fig. 2:
UA＝UB×R3/(R1+R3)；
UC＝UA×R4/(R2+R4)；
wherein R is3Is the impedance value, R, of the load to be detected1Is the resistance value, R, of the first resistor circuit2Is the resistance value, R, of the second resistor circuit4Is the resistance value of the resonant circuit, UAA radio frequency generating circuit 60, a radio frequency isolation module 20 and a load R to be detected3And the voltage value, U, of the connection point of the frequency selection module 30BIs the voltage value, U, output by the band-stop filter circuit in the RF isolation module 20CIs the input voltage value of the signal amplification module 40.
Specifically, the voltage value at point A, B, C in fig. 2 is U in the above formulaA、UBAnd UC. R in the above formula1、R2And R4The magnitude of the resistance can be calculated from the known values of the respective constituent resistors, and thus, R1、R2And R4Is a definite value, which is known before the calculation of the above equation is performed.
Voltage at point B viaPer R1、R2、R3And R4At point A, the voltage is divided, and R2And R4The resistance value is large and is ignored in calculation, so that U in the above formula is obtainedA＝UB×R3/(R1+R3)。
UB: according to the waveform of the impedance detection signal, the parameters of each component in the RC band-pass filter circuit and the LC band-stop filter circuit and the relational expression of current, voltage and resistance in the circuit, the voltage value U of the output point B of the LC band-stop filter circuit can be calculatedBThe preferred value is 500 mV.
UC: the processing module 50 can calculate the voltage value U input by the operational amplifier circuit according to the detected voltage value output by the operational amplifier circuit and by combining the amplification proportion of the operational amplifier circuitC。
By combining the above formula, can obtain UAAnd further obtain R3。
In another embodiment of the present application, there is also provided an impedance detection apparatus, including the impedance detection circuit provided in the above embodiments, and the impedance detection circuit may be integrated in the impedance detection apparatus as a whole, or may be integrated in the impedance detection apparatus according to each module or several modules described in the above embodiments. The specific structure and operation principle of the impedance detection circuit are described in the above embodiments. The impedance detection device may be for radio frequency operation and the load to be detected may be a physiological tissue of a human body.
The impedance detection device in the embodiment comprises an impedance detection circuit, wherein a detection signal module in the impedance detection circuit outputs an impedance detection signal, and the impedance detection signal is processed by a radio frequency isolation module, a frequency selection module and a signal amplification module and then output to a processing module; the radio frequency generating circuit outputs a radio frequency energy signal, the radio frequency energy signal is input from one end of a load to be detected, a radio frequency isolating module and a frequency selecting module, the radio frequency isolating module isolates the radio frequency energy signal and prevents the radio frequency energy signal from being input to a detection signal module, the frequency selecting module absorbs the radio frequency energy signal and allows an impedance detection signal to pass through, after the radio frequency energy signal is processed by a signal amplifying module, the processing module can calculate the impedance value of the load to be detected according to the voltage value of the detected impedance detection signal reaching the processing module, the impedance detecting circuit can be independent from the radio frequency generating circuit, so that the impedance detection signal is not interfered by the radio frequency energy signal when the radio frequency energy signal is input, the accuracy of impedance detection is improved, the detection of the impedance value can be completed before the radio frequency operation, and a reference basis is provided for other parameters needing to be controlled in the radio frequency operation in advance, the convenience of radio frequency operation is greatly improved.
Referring to fig. 4, in another embodiment of the present application, there is further provided an impedance detection method, where detection of an impedance value of a load to be detected can be implemented by an impedance detection apparatus and an impedance detection circuit in an embodiment, the method includes:
s101, controlling a detection signal module to output an alternating current detection signal with a preset frequency, wherein the alternating current detection signal is output to a processing module through a radio frequency isolation module, a frequency selection module and a signal amplification module;
s102, controlling a radio frequency generating circuit to send a radio frequency energy signal, wherein the radio frequency energy signal is input from the connection position of the radio frequency generating circuit and a radio frequency isolation module, a load to be detected and a frequency selection module;
it should be noted that the order of step S102 and step S101 may be interchanged, and is not limited by the description of the current embodiment.
S103, the radio frequency energy signal is prevented from being input into the detection signal module through the radio frequency isolation module, the radio frequency energy signal is filtered through the frequency selection module, the impedance detection signal is subjected to voltage division, the divided impedance detection signal is transmitted to the signal amplification module to be amplified and then transmitted to the processing module, and the processing module is controlled to calculate the impedance value of the load to be detected according to the voltage value of the amplified impedance detection signal.
For further technical details of the impedance detection circuit and the impedance detection apparatus used in the impedance detection method, reference is made to the description of the foregoing embodiments.
In the embodiment of the application, a detection signal module in an impedance detection circuit is controlled to output an impedance detection signal, and the impedance detection signal is processed by a radio frequency isolation module, a frequency selection module and a signal amplification module and then output to a processing module; the radio frequency generating circuit outputs a radio frequency energy signal, the radio frequency energy signal is input from one end of a load to be detected, a radio frequency isolating module and a frequency selecting module, the radio frequency isolating module isolates the radio frequency energy signal and prevents the radio frequency energy signal from being input to a detection signal module, the frequency selecting module absorbs the radio frequency energy signal and allows an impedance detection signal to pass through, after the radio frequency energy signal is processed by a signal amplifying module, the processing module can calculate the impedance value of the load to be detected according to the voltage value of the detected impedance detection signal reaching the processing module, the impedance detecting circuit can be independent from the radio frequency generating circuit, so that the impedance detection signal is not interfered by the radio frequency energy signal when the radio frequency energy signal is input, the accuracy of impedance detection is improved, the detection of the impedance value can be completed before the radio frequency operation, and a reference basis is provided for other parameters needing to be controlled in the radio frequency operation in advance, the convenience of radio frequency operation is greatly improved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In view of the above description of the impedance detection circuit, the impedance detection device and the impedance detection method provided by the present invention, those skilled in the art will recognize that there are variations in the embodiments and applications of the concept of the present invention, and in summary, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An impedance detection circuit, comprising:
the device comprises a detection signal module, a radio frequency isolation module, a frequency selection module, a signal amplification module and a processing module;
the radio frequency isolation module is respectively connected with the detection signal module and the frequency selection module, a load to be detected is respectively connected with the radio frequency isolation module and the frequency selection module, and the signal amplification module is respectively connected with the frequency selection module and the processing module;
the radio frequency generating circuit for sending a radio frequency energy signal is connected with the radio frequency isolating module, the load to be detected and the frequency selection module, the radio frequency isolating module is used for preventing the radio frequency energy signal from being input into the detection signal module which sends a preset frequency impedance detection signal, the frequency selection module is used for filtering the radio frequency energy signal and transmitting the impedance detection signal to the signal amplification module after voltage division, the signal amplification module amplifies the impedance detection signal after voltage division and transmits the impedance detection signal to the processing module, and the processing module calculates the impedance value of the load to be detected according to the voltage value of the amplified impedance detection signal.
2. The impedance detection circuit of claim 1, wherein the frequency selection module comprises: a first resistance circuit and a resonance circuit;
the first resistance circuit comprises a plurality of resistors connected in series, one end of the first resistance circuit is connected to the radio frequency energy signal, and the other end of the first resistance circuit is connected to the resonance circuit.
3. The impedance detection circuit of claim 1 or 2, wherein the radio frequency isolation module comprises: the second resistance circuit and the band-elimination filter circuit;
the second resistance circuit comprises a plurality of resistors connected in series, one end of the second resistance circuit is connected with the radio frequency energy signal and is connected with one end of the first resistance circuit, and the other end of the second resistance circuit is connected with the band elimination filter circuit;
the other end of the band elimination filter circuit is connected with the detection signal module.
4. The impedance detection circuit of claim 3, wherein the detection signal module comprises: the device comprises a square wave signal module and a filtering module;
the square wave signal module is connected with the filtering module and used for generating an impedance detection square wave signal;
the filtering module is also connected with the band elimination filtering circuit and is used for processing the square wave signals into alternating current signals.
5. The impedance detection circuit of claim 4, wherein the square wave signal module comprises a square wave signal source and an inverter;
the phase inverter is connected with the square wave signal source and the filtering module, and the phase inverter inverts the phase of the impedance detection signal in the form of square waves generated by the square wave signal source and then sends the inverted phase to the filtering module.
6. The impedance detection circuit of claim 5, wherein the filtering module comprises: a band-pass filter circuit;
the band-pass filter circuit is respectively connected with the phase inverter and the band-stop filter circuit.
7. The impedance detection circuit of claim 6, wherein the impedance value of the load to be detected is calculated by the formula:
UA＝UB×R3/(R1+R3)；
UC＝UA×R4/(R2+R4)；
wherein R is3Is the impedance value, R, of the load to be detected1Is the resistance value, R, of the first resistor circuit2Is the resistance value, R, of the second resistor circuit4Is the resistance value of the resonant circuit, UAThe voltage value U of the connection point of the radio frequency generation circuit and the radio frequency isolation module, the load to be detected and the frequency selection moduleBIs the voltage value, U, output by the band-stop filter circuitCThe input voltage value of the signal amplification module is obtained.
8. An impedance detection device comprising the impedance detection device according to any one of claims 1 to 7.
9. An impedance detection method, characterized in that the impedance value of a load to be detected is detected by the impedance detection circuit according to any one of claims 1 to 7, the method comprising:
the control detection signal module outputs an alternating current detection signal with preset frequency, and the alternating current detection signal passes through the radio frequency isolation module, the frequency selection module and the signal amplification module and is output to the processing module;
controlling a radio frequency generating circuit to send a radio frequency energy signal, wherein the radio frequency energy signal is input from the connection position of the radio frequency generating circuit and a radio frequency isolation module, the load to be detected and a frequency selection module;
the radio frequency isolation module is used for preventing the radio frequency energy signal from being input into the detection signal module, the frequency selection module is used for filtering the radio frequency energy signal and dividing the impedance detection signal, the divided impedance detection signal is transmitted to the signal amplification module to be amplified and then transmitted to the processing module, and the processing module is controlled to calculate the impedance value of the load to be detected according to the amplified voltage value of the impedance detection signal.
10. The method according to claim 9, wherein the impedance value of the load to be detected is calculated by the formula:
UA＝UB×R3/(R1+R3)；
UC＝UA×R4/(R2+R4)；
wherein R is3Is the impedance value, R, of the load to be detected1Is the resistance value, R, of the first resistor circuit2Is the resistance value, R, of the second resistor circuit4Is the resistance value of the resonant circuit, UAIs the voltage value U of the connection point of the RF generation circuit 60 and the RF isolation module, the load to be detected and the frequency selection moduleBIs the voltage value, U, output by the band-stop filter circuitCIs a stand forAnd the input voltage value of the signal amplification module.
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