Radio frequency generator impedance test circuit

Abstract

The invention relates to the field of radio frequency generators, in particular to a radio frequency generator impedance test circuit. The radio frequency generator impedance test circuit comprises a power supply, a radio frequency power output assembly, a radio frequency conduit, a first undersampling circuit, a second undersampling circuit and a controller, one end of the radio frequency power output assembly is connected with the power supply, and the other end of the radio frequency power output assembly is connected with the radio frequency conduit; one end of the first undersampling circuit is connected with the input end of the radio frequency power output assembly, the other end of the first undersampling circuit is connected with the controller, one end of the second undersampling circuit is connected with the output end of the radio frequency power output assembly, the other end of the second undersampling circuit is connected with the controller, and the first undersampling circuit carries out undersampling on first power utilization data of the input end of the radio frequency power output assembly; the second undersampling circuit is used for undersampling second power utilization data of the output end of the radio frequency power output assembly; and the controller calculates the measurement impedance of the radio frequency catheter according to the first power consumption data and the second power consumption data. The radio frequency generator impedance test circuit is simple and low in cost.

Description

Technical Field

[0001] The invention relates to the field of radio frequency generators, and in particular to a radio frequency generator impedance testing circuit. Background Art

[0002] With the continuous progress of science and technology, radio frequency technology has become more and more mature, and radio frequency systems are increasingly used in various industries. With the continuous development of radio frequency systems, the impedance of radio frequency catheters in radio frequency systems also has its own characteristics.

[0003] Typically, the impedance of the RF catheter of the RF system is measured by synchronously oversampling the output voltage and current through a high-speed ADC (e.g. Figure 1 ), calculate the phase difference, and then get the impedance. This method is costly and the impedance test circuit design is relatively complicated. Summary of the invention

[0004] In view of this, the present invention provides a radio frequency generator impedance test circuit to solve the problems of high cost and relatively complex circuit design of the radio frequency generator impedance test circuit in the prior art.

[0005] In a first aspect, the present invention provides a radio frequency generator impedance test circuit, the radio frequency generator impedance test circuit comprising: a power supply, a radio frequency power output component, a radio frequency catheter, a first under-sampling circuit, a second under-sampling circuit, and a controller, wherein one end of the radio frequency power output component is connected to the power supply, and the other end is connected to the radio frequency catheter; one end of the first under-sampling circuit is connected to the input end of the radio frequency power output component, and the other end is connected to the controller; one end of the second under-sampling circuit is connected to the output end of the radio frequency power output component, and the other end is connected to the controller, wherein:

[0006] A first under-sampling circuit, used for under-sampling first power consumption data at an input end of a radio frequency power output component;

[0007] A second under-sampling circuit is used to under-sample the second power consumption data at the output end of the radio frequency power output component;

[0008] The controller is used to receive the first power usage data and the second power usage data, and calculate the measured impedance of the radio frequency catheter according to the first power usage data and the second power usage data.

[0009] The RF generator impedance test circuit provided by the embodiment of the present application includes: a power supply, a RF power output component, a RF catheter, a first undersampling circuit, a second undersampling circuit, and a controller, wherein one end of the RF power output component is connected to the power supply, and the other end is connected to the RF catheter; one end of the first undersampling circuit is connected to the input end of the RF power output component, and the other end is connected to the controller; one end of the second undersampling circuit is connected to the output end of the RF power output component, and the other end is connected to the controller, wherein: the first undersampling circuit is used to undersample the first power consumption data at the input end of the RF power output component. The second undersampling circuit is used to undersample the second power consumption data at the output end of the RF power output component. The controller is used to receive the first power consumption data and the second power consumption data, and calculate the measured impedance of the RF catheter according to the first power consumption data and the second power consumption data. The above-mentioned RF generator impedance test circuit uses the first undersampling circuit and the second undersampling circuit to undersample the first power consumption data and the second power consumption data respectively. Compared with the traditional method, the RF output frequency band is lower than the sampling frequency band and is easily interfered. However, the above-mentioned RF generator impedance test circuit has a low sampling rate and can suppress RF interference through simple filtering. Therefore, it is not easily interfered and has good stability. In addition, the RF generator impedance test circuit uses the first undersampling circuit and the second undersampling circuit to undersample the first power consumption data and the second power consumption data respectively, and does not require high-precision devices, so the circuit is simple and the cost is low.

[0010] In an optional implementation, the first power usage data includes a first current and a first voltage input to the RF power output component, the first undersampling circuit includes a first current undersampling circuit, a first voltage undersampling circuit and a first low-speed ADC, and the first current undersampling circuit and the first voltage undersampling circuit are respectively connected to the first low-speed ADC, wherein:

[0011] A first current under-sampling circuit, used for collecting a first current;

[0012] A first voltage under-sampling circuit, used for collecting a first voltage;

[0013] The first low-speed ADC is used to perform low-speed analog-to-digital conversion on the first current and the first voltage.

[0014] The RF generator impedance test circuit provided in the embodiment of the present application, the first power consumption data includes the first current and the first voltage input to the RF power output component, the first undersampling circuit includes the first current undersampling circuit and the first voltage undersampling circuit and the first low-speed ADC, the first current undersampling circuit and the first voltage undersampling circuit are respectively connected to the first low-speed ADC, and no high-precision devices are needed, which simplifies the RF generator impedance test circuit and reduces the cost of the RF generator impedance test circuit. A relatively high-precision measurement can be achieved through the low-speed ADC. Among them: the first current undersampling circuit is used to collect the first current; the first voltage undersampling circuit is used to collect the first voltage; the accuracy of the collected first current and the first voltage is guaranteed. The first low-speed ADC is used to perform low-speed analog-to-digital conversion on the first current and the first voltage, so that the controller can receive the data of the first voltage and the data of the first current, and then the measured impedance of the RF catheter can be calculated according to the data of the first voltage and the data of the first current.

[0015] In an optional implementation, the second power usage data includes a second current and a second voltage output by the RF power output component, the second undersampling circuit includes a second current undersampling circuit and a second voltage undersampling circuit and a second low-speed ADC, and the second current undersampling circuit and the second voltage undersampling circuit are respectively connected to the second low-speed ADC, wherein:

[0016] A second current under-sampling circuit, used for under-sampling a second current output by the radio frequency power output component;

[0017] A second voltage under-sampling circuit, used for under-sampling a second voltage output by the radio frequency power output component;

[0018] The second low speed is used for performing low-speed digital-to-analog conversion on the second current and the second voltage.

[0019] The RF generator impedance test circuit provided by the embodiment of the present application, the second power consumption data includes the second current and the second voltage output by the RF power output component, the second undersampling circuit includes the second current undersampling circuit, the second voltage undersampling circuit and the second low-speed ADC, the second current undersampling circuit and the second voltage undersampling circuit are respectively connected to the second low-speed ADC, and no high-precision devices are needed, which simplifies the RF generator impedance test circuit and reduces the cost of the RF generator impedance test circuit. The low-speed ADC can achieve relatively high-precision measurement. Among them: the second current undersampling circuit is used to undersample the second current output by the RF power output component; the second voltage undersampling circuit is used to undersample the second voltage output by the RF power output component; the accuracy of the collected second current and second voltage is ensured. The second low-speed ADC is used to perform low-speed digital-to-analog conversion on the second current and the second voltage. Thereby, it can be ensured that the controller can receive the data of the second voltage and the data of the second current, and then the measured impedance of the RF catheter can be calculated according to the data of the first current, the data of the first voltage, the data of the second voltage and the data of the second current.

[0020] In an optional embodiment, the controller is used to calculate the total input power of the RF power output component based on the first current and the first voltage; calculate the phase angle of the voltage and current corresponding to the RF catheter based on the relationship between the total input power, the second current and the second voltage; and calculate the measured impedance of the RF catheter based on the total input power and the phase angle.

[0021] The RF generator impedance test circuit and controller provided in the embodiment of the present application are used to calculate the total input power of the RF power output component according to the first current and the first voltage, thereby ensuring the accuracy of the calculated total input power. Then, according to the relationship between the total input power, the second current and the second voltage, the phase angle of the voltage and current corresponding to the RF catheter is calculated, thereby ensuring the accuracy of the calculated phase angle of the voltage and current corresponding to the RF catheter; according to the total input power and the phase angle, the measured impedance of the RF catheter is calculated, thereby ensuring the accuracy of the calculated measured impedance of the RF catheter.

[0022] In an optional implementation, the controller is configured to calculate the phase angle by dividing the total input power by the product of the second current and the second voltage and then multiplying the result by the first coefficient.

[0023] The RF generator impedance test circuit and controller provided in the embodiment of the present application are used to calculate the phase angle by dividing the total input power by the product of the second current and the second voltage and then multiplying it by the first coefficient, thereby ensuring the accuracy of the calculated phase angle.

[0024] In an optional embodiment, the controller is used to calculate the resistance and inductance of the radio frequency catheter according to the second voltage and the second current; and determine the measured impedance of the radio frequency catheter according to the resistance and the inductance.

[0025] The RF generator impedance test circuit provided in the embodiment of the present application calculates the resistance and inductance of the RF catheter based on the second voltage and the second current, thereby ensuring the accuracy of the calculated resistance and inductance; and determines the measured impedance of the RF catheter based on the resistance and inductance, thereby ensuring the accuracy of the determined measured impedance of the RF catheter.

[0026] In an optional implementation, the controller is further used to monitor the measured impedance in real time, and when the measured impedance changes, adjust the power output by the RF power output component.

[0027] The RF generator impedance test circuit provided in the embodiment of the present application, the controller is also used to monitor the measured impedance in real time. When the measured impedance changes, the power output by the RF power output component is adjusted, thereby realizing real-time monitoring of the measured impedance and avoiding the RF generator from failing to work properly due to changes in the measured impedance.

[0028] In an optional embodiment, the RF generator impedance test circuit further includes an internal calibration load and a switching switch, wherein an input end of the switching switch is connected to the RF power output component, one end of the output end of the switching switch is connected to the RF catheter, and the other end of the output end of the switching switch is connected to the internal calibration load; wherein;

[0029] When the switch is switched to the internal calibration load, the controller is used to calibrate the impedance test circuit of the RF generator according to the standard impedance corresponding to the internal calibration load.

[0030] The RF generator impedance test circuit provided in the embodiment of the present application also includes an internal calibration load and a switching switch, wherein the switching switch input end is connected to the RF power output component, one end of the switching switch output end is connected to the RF catheter, and the other end of the switching switch output end is connected to the internal calibration load; wherein; when the switching switch is switched to the internal calibration load, the controller is used to calibrate the RF generator impedance test circuit according to the standard impedance corresponding to the internal calibration load. The calibration of the RF generator impedance test circuit is achieved, and the inaccurate measured impedance of the RF catheter is avoided due to the inaccuracy of the RF generator impedance test circuit itself. Therefore, the measured impedance of the above-mentioned RF catheter can further ensure the accuracy of the measured impedance of the measured RF catheter.

[0031] In an optional implementation, the controller is used to calculate the impedance to be calibrated corresponding to the internal calibration load based on the first power usage data and the second power usage data, compare the impedance to be calibrated with the standard impedance, and calibrate the RF generator impedance test circuit based on the comparison result.

[0032] The RF generator impedance test circuit and controller provided in the embodiment of the present application are used to calculate the impedance to be calibrated corresponding to the internal calibration load based on the first power consumption data and the second power consumption data, compare the impedance to be calibrated with the standard impedance, and calibrate the RF generator impedance test circuit based on the comparison result, thereby ensuring the accuracy of the calibration of the RF generator impedance test circuit.

[0033] In an optional embodiment, the first power usage data includes a first current and a first voltage input to the RF power output component, and the second power usage data includes a second current and a second voltage output by the RF power output component; wherein:

[0034] The controller is used to calculate the total input power of the radio frequency power output component according to the first current and the first voltage; divide the total input power by the product of the second current and the second voltage, and then multiply by the first coefficient to calculate the phase angle of the voltage and current corresponding to the radio frequency catheter; calculate the impedance to be calibrated according to the total input power and the phase angle; compare the impedance to be calibrated with the standard impedance, and adjust the first coefficient according to the comparison result so that the impedance to be calibrated is equal to the standard impedance.

[0035] The RF generator impedance test circuit provided in the embodiment of the present application, the controller is used to calculate the total input power of the RF power output component according to the first current and the first voltage, thereby ensuring the accuracy of the calculated total input power. The total input power is divided by the product of the second current and the second voltage, and then multiplied by the first coefficient to calculate the phase angle of the voltage and current corresponding to the RF catheter, thereby ensuring the accuracy of the phase angle of the voltage and current corresponding to the RF catheter. Then, according to the total input power and the phase angle, the impedance to be calibrated is calculated; the impedance to be calibrated is compared with the standard impedance, and according to the comparison result, the first coefficient is adjusted to make the impedance to be calibrated equal to the standard impedance, thereby ensuring the accuracy of the calibration of the RF generator impedance test circuit, and further ensuring the accuracy of the measured impedance of the measured RF catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a schematic diagram of synchronous oversampling in the prior art according to an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of a radio frequency generator impedance test circuit according to an embodiment of the present invention;

[0039] Figure 3 is a schematic diagram of undersampling according to an embodiment of the present invention;

[0040] Figure 4 is a schematic diagram of a radio frequency generator impedance test circuit according to another embodiment of the present invention;

[0041] Figure 5 4 is a schematic diagram of a radio frequency generator impedance testing circuit according to yet another embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0043] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] The present invention provides a radio frequency generator impedance test circuit, such as Figure 2 As shown, the RF generator impedance test circuit includes: a power supply 1, a RF power output component 2, a RF catheter 3, a first under-sampling circuit 4, a second under-sampling circuit 5, and a controller 6, wherein one end of the RF power output component 2 is connected to the power supply 1, and the other end is connected to the RF catheter 3; one end of the first under-sampling circuit 4 is connected to the input end of the RF power output component 2, and the other end is connected to the controller 6; one end of the second under-sampling circuit 5 is connected to the output end of the RF power output component 2, and the other end is connected to the controller 6, wherein:

[0046] A first under-sampling circuit 4 is used to under-sample the first power consumption data at the input end of the radio frequency power output component 2;

[0047] A second under-sampling circuit 5, used for under-sampling the second power consumption data at the output end of the radio frequency power output component 2;

[0048] The controller 6 is used to receive the first power usage data and the second power usage data, and calculate the measured impedance of the radio frequency catheter 3 according to the first power usage data and the second power usage data.

[0049] Specifically, the power supply 1 is used to supply power to the RF power output component 2, and the RF power output component 2 is used to output a RF power signal. The first undersampling circuit 4 is connected to the input end of the RF power output component 2, and is used to undersample the first power consumption data at the input end of the RF power output component 2, wherein the undersampling schematic diagram is as shown in FIG. Figure 3 As shown. The first power consumption data may be at least one of voltage data, current data, and power data. Then, the under-sampled first power consumption data is transmitted to the controller 6.

[0050] The second under-sampling circuit 5 is connected to the output end of the RF power output component 2, and is used to under-sample the second power consumption data output by the RF power output component 2. The second power consumption data can be at least one of voltage data, current data, and power data. Then, the sampled second power consumption data is transmitted to the controller 6.

[0051] After receiving the first power usage data and the second power usage data, the controller 6 calculates the measured impedance of the radio frequency catheter 3 according to the first power usage data and the second power usage data.

[0052] Optionally, the first power usage data may be first power data at the input end of the RF power output component 2, and the second power usage data may be second power data output by the RF power output component 2. The controller 6 may calculate the phase angle of the RF catheter 3 according to the first power data and the second power data. Then, the measured impedance of the RF catheter 3 is calculated using the phase angle and the first power.

[0053] The RF generator impedance test circuit provided by the embodiment of the present application includes: a power supply 1, a RF power output component 2, a RF catheter 3, a first undersampling circuit 4, a second undersampling circuit 5, and a controller 6, wherein one end of the RF power output component 2 is connected to the power supply 1, and the other end is connected to the RF catheter 3; one end of the first undersampling circuit 4 is connected to the input end of the RF power output component 2, and the other end is connected to the controller 6; one end of the second undersampling circuit 5 is connected to the output end of the RF power output component 2, and the other end is connected to the controller 6, wherein: the first undersampling circuit 4 is used to undersample the first power consumption data at the input end of the RF power output component 2. The second undersampling circuit 5 is used to undersample the second power consumption data at the output end of the RF power output component 2. The controller 6 is used to receive the first power consumption data and the second power consumption data, and calculate the measured impedance of the RF catheter 3 according to the first power consumption data and the second power consumption data. The above-mentioned RF generator impedance test circuit uses the first undersampling circuit 4 and the second undersampling circuit 5 to undersample the first power consumption data and the second power consumption data, respectively. Compared with the traditional method, the RF output frequency band is lower than the sampling frequency band and is easily interfered with. However, the above-mentioned RF generator impedance test circuit has a low sampling rate and can suppress RF interference through simple filtering. Therefore, it is not easily interfered with and has good stability. In addition, the RF generator impedance test circuit uses the first undersampling circuit and the second undersampling circuit to undersample the first power consumption data and the second power consumption data, respectively, and does not require high-precision devices, so the circuit is simple and the cost is low.

[0054] In an optional embodiment, if Figure 4 As shown, the RF generator impedance test circuit includes: a power supply 1, a RF power output component 2, a RF catheter 3, a first under-sampling circuit 4, a second under-sampling circuit 5, and a controller 6, wherein one end of the RF power output component 2 is connected to the power supply 1, and the other end is connected to the RF catheter 3; one end of the first under-sampling circuit 4 is connected to the input end of the RF power output component 2, and the other end is connected to the controller 6; one end of the second under-sampling circuit 5 is connected to the output end of the RF power output component 2, and the other end is connected to the controller 6, wherein:

[0055] The first power consumption data obtained by undersampling of the first undersampling circuit 4 includes a first current and a first voltage input to the RF power output component 2. The first undersampling circuit 4 includes a first current undersampling circuit 41, a first voltage undersampling circuit 42, and a first low-speed ADC 43, and the first current undersampling circuit 41 and the first voltage undersampling circuit 42 are respectively connected to the first low-speed ADC 43, wherein:

[0056] A first current under-sampling circuit 41, configured to collect a first current;

[0057] A first voltage under-sampling circuit 42, configured to collect a first voltage;

[0058] The first low-speed ADC 43 is used for performing low-speed analog-to-digital conversion on the first current and the first voltage.

[0059] The second power consumption data obtained by undersampling of the second undersampling circuit 5 includes the second current and the second voltage output by the RF power output component 2. The second undersampling circuit 5 includes a second current undersampling circuit 51, a second voltage undersampling circuit 52 and a second low-speed ADC 53. The second current undersampling circuit 51 and the second voltage undersampling circuit 52 are respectively connected to the second low-speed ADC 53, wherein:

[0060] A second current under-sampling circuit 51, used for under-sampling the second current output by the RF power output component 2;

[0061] The second voltage under-sampling circuit 52 is used to under-sample the second voltage output by the RF power output component 2;

[0062] The second low speed is used for performing low-speed digital-to-analog conversion on the second current and the second voltage.

[0063] The controller 6 is used to calculate the total input power of the radio frequency power output component 2 according to the first current and the first voltage; and calculate the radio frequency catheter 3 according to the relationship between the total input power, the second current and the second voltage.

[0064] Optionally, the controller 6 may calculate the phase angle by dividing the total input power by the product of the second current and the second voltage, and then multiplying the result by the first coefficient.

[0065] Optionally, the controller 6 is used to calculate the resistance and inductance of the radio frequency catheter 3 according to the second voltage and the second current; and determine the measurement impedance of the radio frequency catheter 3 according to the resistance and inductance.

[0066] In an optional implementation, after calculating the measured impedance of the RF catheter 3 , the controller 6 is further configured to monitor the measured impedance in real time, and adjust the power output by the RF power output component 2 when the measured impedance changes.

[0067] Specifically, the power supply 1 is used to supply power to the RF power output component 2, and the RF power output component 2 is used to output a RF power signal. One end of the first current under-sampling circuit 41 and the first voltage under-sampling circuit 42 in the first under-sampling circuit 4 are respectively connected to the input end of the RF power output component 2, and the other ends of the first current under-sampling circuit 41 and the first voltage under-sampling circuit 42 are respectively connected to the first low-speed ADC 43, and the other end of the first low-speed ADC 43 is connected to the controller 6.

[0068] The first current under-sampling circuit 41 and the first voltage under-sampling circuit 42 respectively under-sample the first current and the first voltage input to the RF power output component 2, and then use the first low-speed ADC 43 to perform low-speed digital-to-analog conversion on the first current and the first voltage obtained by the under-sampling, and transmit the low-speed digital-to-analog converted first current and first voltage to the controller 6.

[0069] One end of the second current under-sampling circuit 51 and the second voltage under-sampling circuit 52 in the second under-sampling circuit 5 is respectively connected to the output end of the RF power output component 2, and the other end of the second current under-sampling circuit 51 and the second voltage under-sampling circuit 52 is respectively connected to the second low-speed ADC 53, and the other end of the second low-speed ADC 53 is connected to the controller 6.

[0070] The second current under-sampling circuit 51 and the second voltage under-sampling circuit 52 under-sample the second current and the second voltage output by the RF power output component 2 respectively, and then use the second low-speed ADC53 to perform low-speed digital-to-analog conversion on the under-sampled second current and the second voltage, and transmit the low-speed digital-to-analog converted second current and the second voltage to the controller 6.

[0071] After receiving the first current, the first voltage, the second current and the second voltage after digital-to-analog conversion, the controller 6 calculates the total input power of the RF power output component 2 by multiplying the first current after digital-to-analog conversion by the first voltage. Then, the total input power is divided by the product of the second current and the second voltage after digital-to-analog conversion, and then multiplied by the first coefficient to calculate the phase angle of the RF catheter 3. Then, the resistance and inductance of the RF catheter 3 are calculated according to the second voltage and the second current; and the measurement impedance of the RF catheter 3 is determined according to the resistance and the inductance.

[0072] Exemplarily, the calculation formula may be as follows:

[0073] P=U1*I1 (1)

[0074] ) (2)

[0075] =U2 / I2 (3)

[0076] R= *COSθ (4)

[0077] ZL= *SINθ (5)

[0078] Wherein, P is the total input power, U1 is the first voltage, I1 is the first current; θ is the phase angle, a is the first coefficient, U2 is the second voltage, I2 is the second current, is the impedance of the radio frequency catheter 3 , R is the resistance of the radio frequency catheter 3 , and ZL is the inductive reactance of the radio frequency catheter 3 .

[0079] Optionally, after calculating the measured impedance of the radio frequency catheter 3 , the controller 6 may also monitor the measured impedance in real time, and adjust the power output by the radio frequency power output component 2 when the measured impedance changes.

[0080] Among them, the situation where the measured impedance changes includes but is not limited to, within a preset time, the change value of the measured impedance exceeds the change threshold, for example, the change value of the measured impedance within 1s exceeds the change threshold of 20; the value of the measured impedance becomes 0 or a null value, etc.

[0081] In the RF generator impedance test circuit provided by the embodiment of the present application, the first power consumption data includes the first current and the first voltage input to the RF power output component 2, the first undersampling circuit 4 includes the first current undersampling circuit 41, the first voltage undersampling circuit 42 and the first low-speed ADC 43, the first current undersampling circuit 41 and the first voltage undersampling circuit 42 are respectively connected to the first low-speed ADC 43, and no high-precision devices are required, which simplifies the RF generator impedance test circuit and reduces the cost of the RF generator impedance test circuit. The low-speed ADC can achieve relatively high-precision measurement. Among them: the first current undersampling circuit 41 is used to collect the first current; the first voltage undersampling circuit 42 is used to collect the first voltage; the accuracy of the collected first current and the first voltage is guaranteed. The first low-speed ADC 43 is used to perform low-speed analog-to-digital conversion on the first current and the first voltage, so that the controller 6 can receive the data of the first voltage and the data of the first current, and then the measured impedance of the RF catheter 3 can be calculated according to the data of the first voltage and the data of the first current.

[0082] The second power consumption data includes the second current and the second voltage output by the RF power output component 2. The second undersampling circuit 5 includes a second current undersampling circuit 51, a second voltage undersampling circuit 52 and a second low-speed ADC 53. The second current undersampling circuit 51 and the second voltage undersampling circuit 52 are respectively connected to the second low-speed ADC 53. No high-precision devices are required, which simplifies the RF generator impedance test circuit and reduces the cost of the RF generator impedance test circuit. A relatively high-precision measurement can be achieved through the low-speed ADC. Among them: the second current undersampling circuit 51 is used to undersample the second current output by the RF power output component 2; the second voltage undersampling circuit 52 is used to undersample the second voltage output by the RF power output component 2; the accuracy of the collected second current and second voltage is ensured. The second low-speed ADC 53 is used to perform low-speed digital-to-analog conversion on the second current and the second voltage. Thereby, it can be ensured that the controller 6 can receive the data of the second voltage and the data of the second current, and then the measured impedance of the RF catheter 3 can be calculated according to the data of the first current, the data of the first voltage, the data of the second voltage and the data of the second current.

[0083] The controller 6 calculates the total input power of the RF power output component 2 according to the first current and the first voltage, thereby ensuring the accuracy of the calculated total input power. Then, the total input power is divided by the product of the second current and the second voltage, and then multiplied by the first coefficient to calculate the phase angle, thereby ensuring the accuracy of the calculated phase angle. The measured impedance of the RF catheter 3 is calculated according to the total input power and the phase angle, thereby ensuring the accuracy of the calculated measured impedance of the RF catheter 3.

[0084] In addition, in the RF generator impedance test circuit provided in the embodiment of the present application, the controller 6 is also used to monitor the measured impedance in real time. When the measured impedance changes, the power output by the RF power output component 2 is adjusted, thereby realizing real-time monitoring of the measured impedance and avoiding the RF generator from failing to work properly due to changes in the measured impedance.

[0085] In an optional embodiment, if Figure 5As shown, the present invention provides a radio frequency generator impedance test circuit, comprising: a power supply 1, a radio frequency power output component 2, a radio frequency catheter 3, a first under-sampling circuit 4, a second under-sampling circuit 5, and a controller 6, wherein one end of the radio frequency power output component 2 is connected to the power supply 1, and the other end is connected to the radio frequency catheter 3; one end of the first under-sampling circuit 4 is connected to the input end of the radio frequency power output component 2, and the other end is connected to the controller 6; one end of the second under-sampling circuit 5 is connected to the output end of the radio frequency power output component 2, and the other end is connected to the controller 6; the radio frequency generator impedance test circuit also includes an internal calibration load 7 and a switching switch 8, wherein the input end of the switching switch 8 is connected to the radio frequency power output component 2, and one end of the output end of the switching switch 8 is connected to the radio frequency catheter 3 and the other end is connected to the internal calibration load 7; wherein;

[0086] The controller 6 is used to calibrate the impedance test circuit of the radio frequency generator according to the standard impedance corresponding to the internal calibration load 7.

[0087] In an optional embodiment, the controller 6 is used to calculate the impedance to be calibrated corresponding to the internal calibration load 7 according to the first power usage data and the second power usage data, compare the impedance to be calibrated with the standard impedance, and calibrate the RF generator impedance test circuit according to the comparison result.

[0088] Specifically, when the switch 8 is switched to the internal calibration load 7, the first undersampling circuit 4 undersamples the first power consumption data at the input end of the RF power output component 2; the second undersampling circuit 5 undersamples the second power consumption data at the output end of the RF power output component 2; the controller 6 receives the first power consumption data and the second power consumption data, and calculates the impedance to be calibrated of the internal calibration load 7 according to the first power consumption data and the second power consumption data. In addition, the controller 6 can also receive the standard impedance corresponding to the internal calibration load 7 input by the user. Then, the controller 6 compares the impedance to be calibrated with the standard impedance, and calibrates the impedance test circuit of the RF generator according to the comparison result.

[0089] In an optional embodiment, the first power usage data includes a first current and a first voltage input to the RF power output component 2, and the second power usage data includes a second current and a second voltage output by the RF power output component 2; wherein: the controller 6 is used to calculate the total input power of the RF power output component 2 based on the first current and the first voltage; the phase angle of the RF catheter 3 is calculated by dividing the total input power by the product of the second current and the second voltage, and then multiplying by the first coefficient; the impedance to be calibrated is calculated based on the total input power and the phase angle; the impedance to be calibrated is compared with the standard impedance, and according to the comparison result, the first coefficient is adjusted to make the impedance to be calibrated equal to the standard impedance.

[0090] Specifically, when the switch 8 is switched to the internal calibration load 7, the first undersampling circuit 4 undersamples the first current and the first voltage at the input end of the RF power output component 2; the second undersampling circuit 5 undersamples the second current and the second voltage at the output end of the RF power output component 2. The controller 6 receives the first current, the first voltage, the second current and the second voltage. Then, the controller 6 calculates the total input power of the RF power output component 2 according to the first current and the first voltage; divides the total input power by the product of the second current and the second voltage, and then multiplies it by the first coefficient to calculate the phase angle of the RF catheter 3. Then, the resistance and inductance of the RF catheter are calculated according to the second voltage and the second current; the measured impedance of the RF catheter is determined according to the resistance and the inductance; the impedance to be calibrated is compared with the standard impedance. When the impedance to be calibrated is inconsistent with the standard impedance, the controller 6 adjusts the first coefficient to make the impedance to be calibrated equal to the standard impedance.

[0091] Optionally, after calibrating the RF generator impedance test circuit, the controller 6 can control the switch 8 to switch to the RF catheter 3. Then the first current undersampling circuit 41 and the first voltage undersampling circuit 42 undersample the first current and the first voltage input to the RF power output component 2 respectively, and then use the first low-speed ADC 43 to perform low-speed digital-to-analog conversion on the first current and the first voltage obtained by undersampling, and transmit the low-speed digital-to-analog converted first current and first voltage to the controller 6. One end of the second current undersampling circuit 51 and the second voltage undersampling circuit 52 in the second undersampling circuit 5 are respectively connected to the output end of the RF power output component 2, and the other ends of the second current undersampling circuit 51 and the second voltage undersampling circuit 52 are respectively connected to the second low-speed ADC 53, and the other end of the second low-speed ADC 53 is connected to the controller 6.

[0092] The second current under-sampling circuit 51 and the second voltage under-sampling circuit 52 under-sample the second current and the second voltage output by the RF power output component 2 respectively, and then use the second low-speed ADC53 to perform low-speed digital-to-analog conversion on the under-sampled second current and the second voltage, and transmit the low-speed digital-to-analog converted second current and the second voltage to the controller 6.

[0093] After receiving the first current, the first voltage, the second current and the second voltage after digital-to-analog conversion, the controller 6 calculates the total input power of the RF power output component 2 by multiplying the first current after digital-to-analog conversion by the first voltage. Then, the total input power is divided by the product of the second current and the second voltage after digital-to-analog conversion, and then multiplied by the first coefficient to calculate the phase angle of the RF catheter 3. Then, the resistance and inductance of the RF catheter are calculated according to the second voltage and the second current; and the measurement impedance of the RF catheter is determined according to the resistance and the inductance.

[0094] After calculating the measured impedance of the radio frequency catheter 3 , the controller 6 can also monitor the measured impedance in real time, and adjust the power output by the radio frequency power output component 2 when the measured impedance changes.

[0095] The RF generator impedance test circuit provided in the embodiment of the present application further includes an internal calibration load 7 and a switching switch 8, wherein the input end of the switching switch 8 is connected to the RF power output component 2, and one end of the output end of the switching switch 8 is connected to the RF catheter 3 and the other end is connected to the internal calibration load 7; wherein; when the switching switch 8 is switched to the internal calibration load 7, it is used to calculate the total input power of the RF power output component 2 according to the first current and the first voltage, thereby ensuring the accuracy of the calculated total input power. The phase angle of the RF catheter 3 is calculated by dividing the total input power by the product of the second current and the second voltage, and then multiplying by the first coefficient, thereby ensuring the accuracy of the calculated phase angle of the RF catheter 3. Then, according to the total input power and the phase angle, the impedance to be calibrated is calculated; the impedance to be calibrated is compared with the standard impedance, and according to the comparison result, the first coefficient is adjusted so that the impedance to be calibrated is equal to the standard impedance, thereby ensuring the accuracy of the calibration of the RF generator impedance test circuit, thereby ensuring the accuracy of the measured impedance of the measured RF catheter 3.

[0096] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A radio frequency generator impedance test circuit, characterized in that: The RF generator impedance test circuit includes: a power supply, a RF power output component, a RF catheter, a first under-sampling circuit, a second under-sampling circuit, and a controller, wherein one end of the RF power output component is connected to the power supply, and the other end is connected to the RF catheter; one end of the first under-sampling circuit is connected to the input end of the RF power output component, and the other end is connected to the controller; one end of the second under-sampling circuit is connected to the output end of the RF power output component, and the other end is connected to the controller, wherein: The first under-sampling circuit is used to under-sample the first power consumption data of the input end of the radio frequency power output component; The second under-sampling circuit is used to under-sample the second power consumption data at the output end of the RF power output component; The controller is used to receive the first power usage data and the second power usage data, and calculate the measured impedance of the radio frequency catheter according to the first power usage data and the second power usage data.

2. The RF generator impedance test circuit according to claim 1, characterized in that: The first power usage data includes a first current and a first voltage input to the RF power output component, the first undersampling circuit includes a first current undersampling circuit, a first voltage undersampling circuit and a first low-speed ADC, the first current undersampling circuit and the first voltage undersampling circuit are respectively connected to the first low-speed ADC, wherein: The first current under-sampling circuit is used to collect the first current; The first voltage under-sampling circuit is used to collect the first voltage; The first low-speed ADC is used to perform low-speed analog-to-digital conversion on the first current and the first voltage.

3. The RF generator impedance test circuit according to claim 2, characterized in that: The second power consumption data includes a second current and a second voltage output by the RF power output component, the second under-sampling circuit includes a second current under-sampling circuit and a second voltage under-sampling circuit and a second low-speed ADC, and the second current under-sampling circuit and the second voltage under-sampling circuit are respectively connected to the second low-speed ADC, wherein: The second current under-sampling circuit is used to under-sample the second current output by the RF power output component; The second voltage under-sampling circuit is used to under-sample the second voltage output by the RF power output component; The second low-speed ADC is used to perform low-speed digital-to-analog conversion on the second current and the second voltage.

4. The RF generator impedance test circuit according to claim 3, characterized in that: The controller is used to calculate the total input power of the radio frequency power output component according to the first current and the first voltage; and calculate the phase angle of the voltage and current corresponding to the radio frequency catheter according to the relationship between the total input power, the second current and the second voltage; A measured impedance of the radio frequency catheter is calculated based on the total input power and the phase angle.

5. The RF generator impedance test circuit according to claim 4, characterized in that: The controller is used for calculating the phase angle by dividing the total input power by the product of the second current and the second voltage and then multiplying the product by a first coefficient.

6. The RF generator impedance test circuit according to claim 4, characterized in that: The controller is used to calculate the resistance and inductance of the radio frequency catheter according to the second voltage and the second current; and determine the measured impedance of the radio frequency catheter according to the resistance and inductance.

7. The RF generator impedance test circuit according to claim 4, characterized in that: The controller is also used to monitor the measured impedance in real time, and when the measured impedance changes, adjust the power output by the radio frequency power output component.

8. The RF generator impedance test circuit according to claim 1, characterized in that: The RF generator impedance test circuit further includes an internal calibration load and a switch, wherein an input end of the switch is connected to the RF power output component, one end of the output end of the switch is connected to the RF catheter, and the other end of the output end of the switch is connected to the internal calibration load; wherein: When the switch is switched to the internal calibration load, the controller is used to calibrate the RF generator impedance test circuit according to the standard impedance corresponding to the internal calibration load.

9. The RF generator impedance test circuit according to claim 8, characterized in that: The controller is used to calculate the impedance to be calibrated corresponding to the internal calibration load according to the first power usage data and the second power usage data, compare the impedance to be calibrated with the standard impedance, and calibrate the RF generator impedance test circuit according to the comparison result.

10. The RF generator impedance test circuit according to claim 9, characterized in that: The first power usage data includes a first current and a first voltage input to the RF power output component, and the second power usage data includes a second current and a second voltage output by the RF power output component; wherein: The controller is used to calculate the total input power of the RF power output component according to the first current and the first voltage; divide the total input power by the product of the second current and the second voltage, and then multiply by a first coefficient to calculate the phase angle of the voltage and current corresponding to the RF catheter; calculate the impedance to be calibrated according to the total input power and the phase angle; compare the impedance to be calibrated with the standard impedance, and adjust the first coefficient according to the comparison result so that the impedance to be calibrated is equal to the standard impedance.

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