Voltage sampling device, ablation system, and voltage sampling method

Abstract

The application discloses a voltage sampling device, an ablation system and a voltage sampling method, and belongs to the field of voltage signal detection. The voltage sampling device comprises a sampling circuit, an adjusting circuit and an operation circuit. The sampling circuit is used for sampling a target voltage signal and performing amplitude compensation on the signal being sampled by the sampling circuit based on the frequency of the target voltage signal during the sampling process to obtain a first sampling signal. The adjusting circuit is used for processing the first sampling signal to obtain a second sampling signal. The adjusting circuit is also used for extracting an interference signal in the first sampling signal and generating a compensation signal based on the interference signal. The operation circuit is used for performing subtraction operation on the second sampling signal and the compensation signal to obtain a target sampling signal and output the target sampling signal.

Description

Technical Field

[0001] This application relates to the field of voltage signal detection, and in particular to a voltage sampling device, an ablation system, and a voltage sampling method. Background Technology

[0002] Pulsed electric field ablation is a physical therapy method for tumor treatment that has emerged in recent years. This method is a non-thermal ablation technique that primarily uses high-voltage, steep pulses to induce irreversible electroporation in cells, disrupting cellular homeostasis and triggering apoptosis. Compared to methods such as radiofrequency ablation and cryoablation, pulsed electric field ablation is safer and more effective, and is considered a next-generation disruptive ablation technology.

[0003] Voltage sampling technology, due to its high precision and fast response, is applied in pulsed electric field ablation to measure the waveform information of high-voltage pulses. The measured waveform can not only monitor the working status of the ablation equipment itself, but also, in combination with other measuring devices, reflect the impedance of the lesion location and the impedance change, so as to monitor the ablation effect in real time. Summary of the Invention

[0004] This application provides a voltage sampling device, comprising: a sampling circuit, an adjustment circuit, and a calculation circuit; wherein,

[0005] The sampling circuit is used to sample the target voltage signal, and to perform amplitude compensation on the signal being sampled by the sampling circuit based on the frequency of the target voltage signal during the sampling process to obtain a first sampled signal; the amplitude compensation is used to make the ratio of the amplitude of the first sampled signal to the amplitude of the target voltage signal within a first range.

[0006] The adjustment circuit is used to process the first sampled signal to obtain a second sampled signal;

[0007] The adjustment circuit is also used to extract interference signals from the first sampled signal and generate a compensation signal based on the interference signals.

[0008] The arithmetic circuit is used to perform a subtraction operation on the second sampled signal and the compensation signal to obtain the target sampled signal, and output the target sampled signal.

[0009] In one possible implementation, the sampling circuit includes a first sampling circuit and a second sampling circuit, the first sampling circuit and the second sampling circuit having the same structure; the target voltage signal includes a first voltage signal and a second voltage signal, the first sampling circuit corresponds to the first voltage signal, the second sampling circuit corresponds to the second voltage signal, and the first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase.

[0010] In one possible implementation, both the first sampling circuit and the second sampling circuit include a sampling network and a first compensation network, wherein the sampling network is connected in parallel with the first compensation network; wherein...

[0011] The sampling network is used to sample the corresponding voltage signal;

[0012] The first compensation network is used to perform amplitude compensation on the signal being sampled by the sampling network to obtain a sampled signal. The sampled signal obtained by the first sampling circuit has the same amplitude and opposite phase as the sampled signal obtained by the second sampling circuit.

[0013] In one possible implementation, the sampling network includes a first adjustable resistor for adjusting the DC voltage division ratio between the first sampling circuit and the second sampling circuit; the first compensation network includes a first adjustable capacitor for adjusting the AC voltage division ratio between the first sampling circuit and the second sampling circuit.

[0014] In one possible implementation, both the target voltage signal and the first sampled signal are differential signals; the adjustment circuit includes an amplifier circuit and a conversion circuit; wherein...

[0015] The amplifier circuit is used to amplify the first sampled signal to obtain a third sampled signal, wherein the third sampled signal is a differential signal;

[0016] The conversion circuit is used to convert the third sampled signal into a single-ended signal to obtain the second sampled signal.

[0017] In one possible implementation, the adjustment circuit further includes a compensation circuit;

[0018] The compensation circuit is used to extract a common-mode signal from the third sampled signal and use the extracted common-mode signal as the interference signal in the first sampled signal.

[0019] The compensation circuit is further configured to convert the interference signal into a differential signal and adjust the amplitude of the differential signal to obtain the compensation signal.

[0020] In one possible implementation, the amplifier circuit includes a second compensation network, which in turn includes a second adjustable capacitor; wherein...

[0021] The second compensation network is used to adjust the gain slope of the amplifier circuit by adjusting the second adjustable capacitor to perform gain compensation on the amplifier circuit, the gain compensation being used to make the gain of the amplifier circuit within a second range.

[0022] This application embodiment also provides an ablation system, including: an ablation device and a voltage sampling device as described in any of the above solutions, wherein the ablation device performs tissue ablation by receiving a target sampling signal from the voltage sampling device.

[0023] This application also provides a voltage sampling method, applied to a voltage sampling device, comprising:

[0024] The target voltage signal is sampled by a sampling circuit, and the amplitude of the sampled signal is compensated based on the frequency of the target voltage signal during the sampling process to obtain a first sampled signal; the amplitude compensation is used to make the ratio of the amplitude of the first sampled signal to the amplitude of the target voltage signal within a first range.

[0025] The first sampled signal is processed to obtain the second sampled signal;

[0026] Extract the interference signal from the first sampled signal, and generate a compensation signal based on the interference signal;

[0027] The second sampled signal and the compensation signal are subtracted to obtain the target sampled signal, and the target sampled signal is output.

[0028] In one possible implementation, the sampling circuit includes a first sampling circuit and a second sampling circuit, the first sampling circuit and the second sampling circuit having the same structure; the target voltage signal includes a first voltage signal and a second voltage signal, the first sampling circuit corresponds to the first voltage signal, the second sampling circuit corresponds to the second voltage signal, and the first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase.

[0029] In one possible implementation, both the first sampling circuit and the second sampling circuit include a sampling network and a first compensation network. The sampling network is connected in parallel with the first compensation network. The sampling network is used to sample the voltage signal, and the first compensation network is used to perform amplitude compensation on the signal being sampled by the sampling network to obtain a sampled signal. The sampled signal obtained by the first sampling circuit has the same amplitude and opposite phase to the sampled signal obtained by the second sampling circuit.

[0030] In one possible implementation, the sampling network includes a first adjustable resistor for adjusting the DC voltage division ratio between the first sampling circuit and the second sampling circuit; the first compensation network includes a first adjustable capacitor for adjusting the AC voltage division ratio between the first sampling circuit and the second sampling circuit.

[0031] In one possible implementation, both the target voltage signal and the first sampled signal are differential signals; the processing of the first sampled signal to obtain the second sampled signal includes:

[0032] The first sampled signal is amplified to obtain a third sampled signal, which is a differential signal;

[0033] The third sampling signal is converted into a single-ended signal to obtain the second sampling signal.

[0034] In one possible implementation, extracting the interference signal from the first sampled signal includes:

[0035] The common-mode signal is extracted from the third sampled signal, and the extracted common-mode signal is used as the interference signal in the first sampled signal;

[0036] The generation of the compensation signal based on the interference signal includes:

[0037] The compensation circuit converts the interference signal into a differential signal and adjusts the amplitude of the differential signal to obtain the compensation signal.

[0038] The voltage sampling device, ablation system, and voltage sampling method provided in this application include a sampling circuit in the voltage sampling device that performs amplitude compensation on the signal being sampled based on the frequency of the target voltage signal during the sampling process. This amplitude compensation ensures that the ratio of the amplitude of the sampled signal to the amplitude of the target voltage signal is within a first range. Since the amplitude compensation is based on the frequency of the target voltage signal, the sampling circuit can perform amplitude compensation on the signal being sampled regardless of whether the target voltage signal is a high-frequency or low-frequency signal. This facilitates achieving a higher sampling bandwidth, thereby improving the integrity and accuracy of the sampling. Furthermore, the adjustment circuit in the voltage sampling device generates a compensation signal based on the interference signal extracted from the sampled signal, and the arithmetic circuit performs a subtraction operation on the sampled signal and the compensation signal. In other words, the voltage sampling device extracts the interference signal and compensates for it based on the interference signal, thereby filtering out the interference signal in the sampled signal. This may achieve distortion-free sampling of the target voltage signal, further improving the accuracy of the sampling. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a voltage sampling device according to an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of another voltage sampling device according to an embodiment of this application;

[0041] Figure 3This is a schematic diagram of the third voltage sampling device according to an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the ablation system structure according to an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the ablation device structure according to an embodiment of this application;

[0044] Figure 6 This is a schematic flowchart of the voltage sampling method according to an embodiment of this application. Detailed Implementation

[0045] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0046] First, taking pulsed electric field ablation technology as an example, we describe the problem that voltage sampling methods in related technologies may not be able to accurately sample high-voltage pulses.

[0047] During pulsed electric field ablation, it is crucial to accurately measure the waveform information of the high-voltage pulse. The measured waveform can not only monitor the working status of the ablation equipment itself, but also, in conjunction with other measuring devices, reflect the impedance and impedance changes at the lesion location.

[0048] To address the aforementioned scenarios, relevant technologies employ voltage dividers such as resistor voltage dividers, capacitor voltage dividers, and high-voltage probes to measure the waveform information of high-voltage pulses. However, in resistor voltage dividers, the resistor impedance cannot be too high; otherwise, the measurement error will be significantly affected by the input impedance of the subsequent stage, and the high-frequency information of the waveform may be severely affected by distributed parameters, almost resulting in its loss. Similarly, capacitor voltage dividers are also significantly affected by the input impedance of the subsequent circuit, especially in accurately measuring the low-frequency components of the signal. Furthermore, some mature high-voltage probe products on the market suffer from both high cost and low bandwidth, failing to accurately reflect fast leading-edge and narrow pulse signals, and are susceptible to interference from fast high-voltage pulses, leading to output waveform distortion.

[0049] In general, for technical scenarios such as pulsed electric field ablation, the output high-voltage pulses have fast leading edges and pulse widths that are mostly between hundreds of nanoseconds and hundreds of microseconds, and in some cases only tens of nanoseconds. Traditional voltage sampling devices may not be able to meet the sampling requirements of such signals.

[0050] Based on this, in various embodiments of this application, the sampling circuit in the voltage sampling device performs amplitude compensation on the signal being sampled by the sampling circuit based on the frequency of the target voltage signal during the sampling process of the target voltage signal. The amplitude compensation is used to make the ratio of the amplitude of the sampled signal to the amplitude of the target voltage signal within a first range. Since the amplitude compensation performed by the sampling circuit is based on the frequency of the target voltage signal, the sampling circuit can perform amplitude compensation on the signal being sampled regardless of whether the target voltage signal is a high-frequency signal or a low-frequency signal. This is beneficial to achieving a higher sampling bandwidth, thereby contributing to the integrity and accuracy of the sampling. Furthermore, the adjustment circuit in the voltage sampling device generates a compensation signal based on the interference signal extracted from the sampled signal, and the arithmetic circuit performs a subtraction operation on the sampled signal and the compensation signal. That is, the voltage sampling device extracts the interference signal and compensates based on the interference signal in the sampled signal, thereby filtering out the interference signal in the sampled signal. This may achieve distortion-free sampling of the target voltage signal, which helps to improve the accuracy of the sampling. In summary, voltage sampling devices are beneficial for ensuring the integrity of sampling and improving sampling accuracy. For example, in high-voltage pulse sampling scenarios, the voltage sampling device provided in this application can not only ensure the integrity of high-voltage pulse sampling but also help to achieve accurate sampling of high-voltage pulses.

[0051] It should be noted that, in the various embodiments of this application, the method for determining high frequency / low frequency can be understood with reference to related technologies, and this application does not make a special definition for it. In addition, "one or more" means at least one, and "multiple" means at least two.

[0052] This application provides a voltage sampling device, such as... Figure 1 As shown, it includes: a cascaded sampling circuit 110, an adjustment circuit 120, and an operational circuit 130; wherein,

[0053] The sampling circuit 110 is used to sample the target voltage signal and to perform amplitude compensation on the signal being sampled by the sampling circuit 110 based on the frequency of the target voltage signal during the sampling process to obtain a first sampled signal; the amplitude compensation is used to make the ratio of the amplitude of the first sampled signal to the amplitude of the target voltage signal within a first range.

[0054] Since the amplitude compensation performed by the sampling circuit 110 is based on the frequency of the target voltage signal, the sampling circuit 110 can perform amplitude compensation on the signal being sampled, regardless of whether the target voltage signal is a high-frequency signal or a low-frequency signal. This can potentially achieve a higher sampling bandwidth, which is beneficial to the integrity and accuracy of the sampling.

[0055] Optionally, the specific method of generating the target voltage signal and the specific method of inputting the target voltage signal to the voltage sampling device can be preset according to the circuit deployment scenario, voltage sampling requirements, etc. For example, the target voltage signal can be generated by a specific power supply and input to the voltage sampling device. This application embodiment does not limit this.

[0056] Optionally, during the sampling process, the sampling circuit 110 performs amplitude compensation on the signal being sampled by the sampling circuit 110 based on the frequency of the target voltage signal. This means that the first sampled signal obtained by the sampling circuit 110 is the amplitude-compensated signal. For example, the amount of amplitude compensation can increase linearly with the increase of the frequency of the target voltage signal, which is beneficial for accurately performing amplitude compensation on the signal being sampled and can further improve the sampling accuracy.

[0057] Optionally, the specific formula relationship between the compensation amount and the frequency of the target voltage signal, the specific method by which the sampling circuit 110 obtains the compensation amount, and the specific value of the first range can be preset according to the circuit deployment scenario, voltage sampling requirements, etc. This application embodiment does not limit this, as long as the amplitude compensation effect of "the ratio of the amplitude of the first sampling signal to the amplitude of the target voltage signal is within the first range" can be achieved.

[0058] Considering that the target voltage signal may be a differential signal, and a differential signal contains two signals with equal amplitude and opposite phase, the sampling circuit 110 can perform differential sampling on the target voltage signal through two sub-circuits with the same circuit structure (which can be referred to as the first sampling circuit and the second sampling circuit). Accordingly, the first sampling signal can also be a differential signal.

[0059] In one possible implementation, such as Figure 2 As shown, the sampling circuit 110 may include a first sampling circuit 210 and a second sampling circuit 220 connected in parallel. The first sampling circuit 210 and the second sampling circuit 220 have the same structure. The target voltage signal may include a first voltage signal and a second voltage signal. The first sampling circuit 210 corresponds to the first voltage signal, and the second sampling circuit 220 corresponds to the second voltage signal. The first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase.

[0060] Optionally, the first sampling circuit 210 and the second sampling circuit 220 can be broadband voltage sampling circuits, and the first sampling circuit 210 and the second sampling circuit 220 are connected in parallel.

[0061] When the target voltage signal is a differential signal, since the amplitude compensation is based on the frequency of the differential signal, the sampling circuit 110 can accurately perform amplitude compensation on the signal being sampled, whether it is a high-frequency differential signal or a low-frequency differential signal.

[0062] In one possible implementation, such as Figure 3 As shown, the first sampling circuit 210 includes a sampling network 310 and a first compensation network 320. The sampling network 310 in the first sampling circuit 210 is used to sample the first voltage signal, and the first compensation network 320 is used to perform amplitude compensation on the signal being sampled by the sampling network 310 to obtain a sampled signal. The second sampling circuit 220 includes a sampling network 330 and a first compensation network 340. The sampling network 330 in the second sampling circuit 220 is used to sample the second voltage signal, and the first compensation network 340 is used to perform amplitude compensation on the signal being sampled by the sampling network 330 to obtain a sampled signal. Since the first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase, the signals sampled by the first sampling circuit 210 and the second sampling circuit 220 have equal amplitude but opposite phase.

[0063] Optionally, the specific sampling method of the above sampling network can be preset according to the circuit deployment scenario, voltage sampling requirements, etc., such as voltage division sampling through resistors and / or capacitors, etc., which is not limited in this embodiment.

[0064] Optionally, the amplitude compensation method of the first compensation network can be preset according to the circuit deployment scenario, voltage sampling requirements, etc. For example, amplitude compensation can be performed by capacitive reactance compensation, etc., and this application embodiment does not limit this.

[0065] Furthermore, the specific circuit structures of the sampling network and the first compensation network are not limited in the embodiments of this application, as long as their functions are implemented.

[0066] By setting the sampling network and the first compensation network in the first sampling circuit / second sampling circuit, frequency-based amplitude compensation can be performed on two signals with equal amplitude and opposite phase in the differential signal. Therefore, whether it is a high-frequency differential signal or a low-frequency differential signal, the sampling circuit 110 can accurately perform amplitude compensation on the signal being sampled. That is, a higher sampling bandwidth can be achieved for differential signals, which is beneficial to the integrity and accuracy of differential signal sampling.

[0067] In one possible implementation, such as Figure 3 As shown, sampling network 310 may include a first adjustable resistor R5, and sampling network 330 includes a first adjustable resistor R9. The first adjustable resistor can be used to adjust the DC voltage division ratio between the first sampling circuit 210 and the second sampling circuit 220.

[0068] By adjusting the first adjustable resistor R5 in the first sampling circuit 210 and / or the first adjustable resistor R9 in the second sampling circuit 220, the DC voltage division ratio between the first sampling circuit 210 and the second sampling circuit 220 can be changed, thereby enabling fine-tuning (or fine adjustment or calibration) of the sampling error caused by component tolerances, which is beneficial to further improve the accuracy / precision of sampling voltage signals.

[0069] In one possible implementation, such as Figure 3 As shown, the first compensation network 320 may include a first adjustable capacitor C1, and the first compensation network 340 includes a first adjustable capacitor C7. The first adjustable capacitor can be used to adjust the AC voltage division ratio between the first sampling circuit 210 and the second sampling circuit 220.

[0070] By adjusting the first adjustable capacitor C1 in the first sampling circuit 210 and / or the first adjustable capacitor C7 in the second sampling circuit 220, the AC voltage division ratio (e.g., the high-frequency AC voltage division ratio) between the first sampling circuit 210 and the second sampling circuit 220 can be changed. This allows for fine-tuning (or fine adjustment or calibration) of the sampling error caused by component tolerances, thereby further improving the accuracy / precision of voltage signal sampling.

[0071] In one possible implementation, such as Figure 3 As shown, the first compensation network 320 also includes capacitors C2 and C3. Capacitor C3 is connected in parallel with the adjustable capacitor C1, and capacitor C2 is connected in series with capacitors C1 and C3. The sampling network 310 also includes resistors R4 and R6, which are connected in series. The ratio of the amplitude of the circuit output signal to the amplitude of the input signal (i.e., the ratio of the amplitude of the first sampled signal to the amplitude of the signal that samples the target voltage signal) can be calculated using Formula 1:

[0072]

[0073] Among them, V OUT V represents the output signal of the circuit. IN denoted by f, which represents the input signal of the circuit.

[0074] Alternatively, Formula 1 can also be understood as the transfer function of the first compensation network 320, which can be used to calculate the gain of the first compensation network 320.

[0075] In one possible implementation, the adjustment circuit 120 is used to process the first sampled signal to obtain a second sampled signal;

[0076] The adjustment circuit 120 is also used to extract interference signals from the first sampled signal and generate a compensation signal based on the interference signals.

[0077] In one possible implementation, such as Figure 2 As shown, both the target voltage signal and the first sampled signal are differential signals; the adjustment circuit 120 includes an amplifier circuit 230, which amplifies the first sampled signal to obtain a third sampled signal, which is a differential signal.

[0078] The amplifier circuit 230 can accurately amplify the first sampled signal. By setting a specific amplification factor, it can be applied to different sampling scenarios, which helps to improve the compatibility of the voltage sampling device.

[0079] While amplifying the first sampled signal, the operational amplifier's inherent structural characteristics (such as high input impedance) enable it to suppress low-frequency common-mode interference in the first sampled signal. This provides a certain bandwidth (the specific bandwidth can be related to the amplifier's structure and set as needed) of low-frequency common-mode rejection capability. Furthermore, due to the operational amplifier's inherent structural characteristics (such as high input impedance), the amplifier circuit also addresses the sensitivity of the sampling circuit 110 to the input impedance of other related subsequent circuits, achieving impedance isolation between the sampling circuit 110 and other related subsequent circuits.

[0080] In one possible implementation, the amplifier circuit may include a second compensation network, which may include a second adjustable capacitor; wherein...

[0081] The second compensation network is used to adjust the gain slope of the amplifier circuit by adjusting the second adjustable capacitor to perform gain compensation on the amplifier circuit. The gain compensation is used to make the gain of the amplifier circuit within the second range.

[0082] Optionally, the specific circuit structure of the second compensation network, the specific principle of the second compensation network adjusting the gain slope of the amplifier circuit by adjusting the second adjustable capacitor, and the specific value of the second range can be preset according to the circuit deployment scenario, voltage sampling requirements, etc. This application embodiment does not limit these, as long as the gain compensation effect of "the gain of the amplifier circuit is within the second range" can be achieved.

[0083] Regardless of whether the target voltage signal is a high-frequency signal or a low-frequency signal, by controlling the gain of the amplifier circuit within a second range and setting the difference between the maximum and minimum values ​​of the second range to a minimum value (such as 0.1), the stability of the amplifier circuit's gain can be enhanced, that is, the anti-interference capability of the amplifier circuit can be enhanced, which is conducive to further improving the accuracy of voltage signal sampling.

[0084] In one possible implementation, such as Figure 3 As shown, the amplifier circuit 230 includes resistors R3, R7, R13 and an adjustable capacitor C4. R3, R7 and R13 together determine the AC amplification factor of the differential signal. C4 is a high-frequency gain compensation capacitor (i.e., the second adjustable capacitor), which can adjust the AC gain of the amplifier circuit 230 before signal amplification.

[0085] Alternatively, the ratio of the amplitude of the output signal to the amplitude of the input signal of the amplifier circuit 230 can be calculated using the following formula:

[0086]

[0087] Formula 2 can also be understood as the transfer function of amplifier circuit 230, which can be used to calculate the gain of amplifier circuit 230.

[0088] In one possible implementation, such as Figure 2 As shown, both the target voltage signal and the first sampled signal are differential signals; the adjustment circuit 120 also includes a conversion circuit 240, which is used to convert the third sampled signal into a single-ended signal to obtain the second sampled signal.

[0089] Converting differential signals into single-ended signals via a conversion circuit improves the compatibility of voltage sampling devices and makes them suitable for more application scenarios.

[0090] Optionally, such as Figure 3 As shown, the conversion circuit 240 includes an operational amplifier U2B and resistors R1, R2, R14 and R15. By using the operational amplifier U2B and resistors R1, R2, R14 and R15, the differential signal can be converted into a single-ended signal, thereby improving the compatibility of the voltage sampling device and helping to make the voltage sampling device suitable for more application scenarios.

[0091] Optionally, the conversion circuit 240 utilizes an operational amplifier to convert the third sampled signal into a single-ended signal, or it can further amplify the sampled signal during the conversion process. That is, the second sampled signal can be a further amplified sampled signal. This improves the signal amplification capability of the voltage sampling device, thereby enhancing its compatibility and making it suitable for more application scenarios. Whether the conversion circuit further amplifies the sampled signal can be preset based on the circuit deployment scenario, voltage sampling requirements, etc., and this embodiment does not limit this.

[0092] In one possible implementation, such as Figure 2 As shown, the adjustment circuit 120 may further include a compensation circuit 250; wherein,

[0093] The compensation circuit 250 is used to extract a common-mode signal from the third sampled signal and use the extracted common-mode signal as the interference signal in the first sampled signal;

[0094] The compensation circuit 250 is further configured to convert the interference signal into a differential signal and adjust the amplitude of the differential signal to obtain the compensation signal.

[0095] Since the amplifier circuit has already used the structural characteristics of the operational amplifier itself (such as high input impedance at the input terminal) to eliminate low-frequency common-mode interference in the sampled signal, the common-mode signal extracted by the compensation circuit from the third sampled signal is a high-frequency common-mode signal. That is, the compensation circuit extracts a high-frequency common-mode interference signal from the third sampled signal.

[0096] Since common-mode signals cannot directly compensate for differential-mode signals, the interference signal is first converted into a differential-mode signal, and then the amplitude of the differential-mode signal is adjusted to obtain the compensation signal. This can more accurately convert the interference signal into a controllable compensation amount, which can improve the accuracy of the compensation signal and thus help improve the accuracy of the sampling signal.

[0097] Optionally, such as Figure 3 As shown, the compensation circuit 250 in the voltage sampling device can extract the high-frequency common-mode interference signal in the third sampled signal by using amplifier U5B and convert the interference signal into a differential-mode signal; at the same time, the amplitude of the differential-mode signal can be adjusted by using amplifier U5B, capacitor C8, capacitor C9 and resistor R22.

[0098] In one possible implementation, the arithmetic circuit 130 is used to perform a subtraction operation on the second sampled signal and the compensation signal to obtain the target sampled signal, and output the target sampled signal.

[0099] Optionally, the operational circuit 130 may include operational amplifiers, as well as components such as resistors and / or capacitors. The specific circuit structure of the operational circuit 130 is not limited in this application embodiment, as long as its function is achieved.

[0100] Since the second sampled signal is obtained by the conversion circuit through converting the third sampled signal into a single-ended signal, the common-mode signal (i.e., high-frequency common-mode interference signal) in the third sampled signal may be converted into a differential signal superimposed on the single-ended signal output by the circuit after processing by the conversion circuit. In other words, the second sampled signal may contain superimposed high-frequency interference signals. However, by performing a subtraction operation between the second sampled signal and the compensation signal by the arithmetic circuit 130, the high-frequency interference signal in the second sampled signal can be filtered out, thereby ensuring the accuracy of the target sampled signal. In other words, through the design of the arithmetic circuit 130, the high-frequency common-mode interference signal that the preceding circuit could not completely suppress can be suppressed, and the final measurement result (i.e., the target sampled signal) can be compensated. This results in a target sampled signal with high-frequency common-mode interference that is significantly suppressed or basically eliminated, which helps to achieve accurate sampling of high-speed pulse voltage.

[0101] Optionally, for Figure 3 The operational circuit 130 in the voltage sampling device shown can perform a subtraction operation between the differentially amplified signal (i.e., the second sampling signal) and the compensation signal by using amplifier U3B. This can eliminate the remaining high-frequency interference signal in the second sampling signal, which is beneficial for obtaining the target sampling signal in which high-frequency common-mode interference is greatly suppressed or can be basically eliminated.

[0102] In one possible implementation, such as Figure 2 As shown, the voltage sampling device may further include a power supply circuit 260 for providing power to one or more components in the voltage sampling device.

[0103] For example, the power supply circuit 260 may specifically include a precision power supply circuit that can provide low-noise power to one or more components (such as amplifiers) in the voltage sampling device.

[0104] By setting up the power supply circuit 260, the compatibility of the voltage sampling device can be improved, making it suitable for more application scenarios.

[0105] This application also provides an ablation system, such as Figure 4 As shown, the ablation system may include an ablation device 410 and a voltage sampling device 420 provided by one or more of the above-described technical solutions. The ablation device 410 can perform tissue ablation by receiving a target sampling signal from the voltage sampling device 420. Furthermore, the structure of the ablation device 410 may be as follows: Figure 5 As shown.

[0106] Accordingly, embodiments of this application also provide a voltage sampling method, applied to the voltage sampling device provided by one or more of the above-mentioned technical solutions, such as... Figure 6 As shown, the method includes:

[0107] Step 601: The target voltage signal is sampled by a sampling circuit, and amplitude compensation is performed on the sampled signal based on the frequency of the target voltage signal during the sampling process to obtain a first sampled signal; the amplitude compensation is used to make the ratio of the amplitude of the first sampled signal to the amplitude of the target voltage signal within a first range.

[0108] Step 602: Process the first sampled signal to obtain the second sampled signal;

[0109] Step 603: Extract the interference signal from the first sampled signal and generate a compensation signal based on the interference signal;

[0110] Step 604: Perform a subtraction operation on the second sampled signal and the compensation signal to obtain the target sampled signal, and output the target sampled signal.

[0111] Because amplitude compensation is performed on the sampled signal based on the frequency of the target voltage signal during the sampling process, the amplitude compensation can be accurately performed on the sampled signal regardless of whether the target voltage signal is a high-frequency or low-frequency signal, achieving a higher sampling bandwidth and ensuring the integrity and accuracy of the sampling. Furthermore, because interference signals are extracted and compensated based on the interference signals in the sampled signal, interference signals in the sampled signal can be filtered out, achieving distortion-free sampling of the target voltage signal and further improving the sampling accuracy.

[0112] In one possible implementation, the sampling circuit includes a first sampling circuit and a second sampling circuit, the first sampling circuit and the second sampling circuit having the same structure; the target voltage signal includes a first voltage signal and a second voltage signal, the first sampling circuit corresponds to the first voltage signal, the second sampling circuit corresponds to the second voltage signal, and the first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase.

[0113] When the target voltage signal is a differential signal, amplitude compensation is performed on the sampled signal based on the frequency of the differential signal during the sampling process. Therefore, whether it is a high-frequency differential signal or a low-frequency differential signal, the amplitude compensation of the sampled signal can be accurately performed, achieving a higher sampling bandwidth for differential signals and ensuring the integrity and accuracy of differential signal sampling.

[0114] In one possible implementation, both the first sampling circuit and the second sampling circuit include a sampling network and a first compensation network. The sampling network is connected in parallel with the first compensation network. The sampling network is used to sample the voltage signal, and the first compensation network is used to perform amplitude compensation on the signal being sampled by the sampling network to obtain a sampled signal. The sampled signal obtained by the first sampling circuit has the same amplitude and opposite phase to the sampled signal obtained by the second sampling circuit.

[0115] By setting the sampling network and the first compensation network in the first sampling circuit / second sampling circuit, frequency-based amplitude compensation can be performed on two signals with equal amplitude and opposite phase in the differential signal. Therefore, whether it is a high-frequency differential signal or a low-frequency differential signal, the amplitude compensation of the signal being sampled can be accurately performed, achieving a higher sampling bandwidth for the differential signal and ensuring the integrity and accuracy of the differential signal sampling.

[0116] In one possible implementation, the sampling network includes a first adjustable resistor for adjusting the DC voltage division ratio between the first sampling circuit and the second sampling circuit.

[0117] By adjusting the first adjustable resistor in the first sampling circuit and / or the second sampling circuit, the DC voltage division ratio between the first sampling circuit and the second sampling circuit can be changed, thereby enabling fine-tuning (or fine adjustment or calibration) of the sampling error caused by component tolerances, which is beneficial to further improve the accuracy / precision of sampling voltage signals.

[0118] In one possible implementation, the first compensation network includes a first adjustable capacitor for adjusting the AC voltage division ratio between the first sampling circuit and the second sampling circuit.

[0119] By adjusting the first adjustable capacitor in the first sampling circuit and / or the second sampling circuit, the AC voltage division ratio (e.g., the high-frequency AC voltage division ratio) between the first sampling circuit and the second sampling circuit can be changed, thereby enabling fine-tuning (or fine adjustment or calibration) of the sampling error caused by component tolerances, which is beneficial to further improve the accuracy / precision of sampling voltage signals.

[0120] In one possible implementation, both the target voltage signal and the first sampled signal are differential signals; the processing of the first sampled signal to obtain the second sampled signal may include:

[0121] The first sampled signal is amplified to obtain a third sampled signal, which is a differential signal;

[0122] The third sampling signal is converted into a single-ended signal to obtain the second sampling signal.

[0123] By amplifying the first sampled signal, a higher sampling bandwidth can be achieved, ensuring the integrity of the high-voltage pulse sampling. This enables distortion-free sampling of the voltage signal, thereby improving sampling accuracy. Converting the differential signal to a single-ended signal enhances the compatibility of the voltage sampling method, making it suitable for a wider range of applications.

[0124] In one possible implementation, extracting the interference signal from the first sampled signal may include:

[0125] The common-mode signal is extracted from the third sampled signal, and the extracted common-mode signal is used as the interference signal in the first sampled signal;

[0126] The step of generating a compensation signal based on the interference signal may include:

[0127] The compensation circuit converts the interference signal into a differential signal and adjusts the amplitude of the differential signal to obtain the compensation signal.

[0128] Since common-mode signals cannot directly compensate for differential-mode signals, the interference signal is first converted into a differential-mode signal, and then the amplitude of the differential-mode signal is adjusted to obtain the compensation signal. This can more accurately convert the interference signal into a controllable compensation amount, thereby improving the accuracy of the compensation signal and thus enhancing the accuracy of the sampling signal.

[0129] It should be noted that, Figure 6 The voltage sampling method shown is based on the same concept as the voltage sampling device embodiment described above. Its specific implementation process can be understood by referring to the voltage sampling device embodiment, and will not be repeated here.

[0130] The solution provided in this application has the following advantages: Since amplitude compensation is performed on the sampled signal based on the frequency of the target voltage signal during sampling, the amplitude compensation can be accurately performed on the sampled signal regardless of whether the target voltage signal is a high-frequency or low-frequency signal, achieving higher sampling bandwidth and ensuring sampling integrity and accuracy. Furthermore, since interference signals are extracted and compensated based on the interference signals in the sampled signal, interference signals in the sampled signal can be filtered out, achieving distortion-free sampling of the target voltage signal and further improving sampling accuracy. In summary, the voltage sampling device can ensure both sampling integrity and improve sampling accuracy. For example, in high-voltage pulse sampling scenarios, the solution provided in this application can ensure both the integrity and accurate sampling of high-voltage pulses.

[0131] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0132] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict. The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application.

Claims

1. A voltage sampling device, characterized in that, include: Sampling circuit, adjustment circuit, and operational circuit; among which, The sampling circuit is used to sample the target voltage signal, and to perform amplitude compensation on the signal being sampled by the sampling circuit based on the frequency of the target voltage signal during the sampling process to obtain a first sampled signal; the amplitude compensation is used to make the ratio of the amplitude of the first sampled signal to the amplitude of the target voltage signal within a first range. The adjustment circuit is used to process the first sampled signal to obtain a second sampled signal; The adjustment circuit is also used to extract interference signals from the first sampled signal and generate a compensation signal based on the interference signals. The arithmetic circuit is used to perform a subtraction operation on the second sampled signal and the compensation signal to obtain the target sampled signal, and output the target sampled signal. The adjustment circuit includes an amplifier circuit, a conversion circuit, and a compensation circuit. The amplifier circuit is used to amplify the first sampled signal to obtain a third sampled signal; The conversion circuit is used to convert the third sampled signal into a single-ended signal to obtain the second sampled signal; The compensation circuit is used to convert the interference signal into a differential signal and adjust the amplitude of the differential signal to obtain the compensation signal.

2. The voltage sampling device according to claim 1, characterized in that, The sampling circuit includes a first sampling circuit and a second sampling circuit, and the first sampling circuit and the second sampling circuit have the same structure; the target voltage signal includes a first voltage signal and a second voltage signal, the first sampling circuit corresponds to the first voltage signal, the second sampling circuit corresponds to the second voltage signal, and the first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase.

3. The voltage sampling device according to claim 2, characterized in that, Both the first sampling circuit and the second sampling circuit include a sampling network and a first compensation network, wherein the sampling network is connected in parallel with the first compensation network; wherein, The sampling network is used to sample the corresponding voltage signal; The first compensation network is used to perform amplitude compensation on the signal being sampled by the sampling network to obtain a sampled signal. The sampled signal obtained by the first sampling circuit has the same amplitude and opposite phase as the sampled signal obtained by the second sampling circuit.

4. The voltage sampling device according to claim 3, characterized in that, The sampling network includes a first adjustable resistor for adjusting the DC voltage division ratio between the first sampling circuit and the second sampling circuit; the first compensation network includes a first adjustable capacitor for adjusting the AC voltage division ratio between the first sampling circuit and the second sampling circuit.

5. The voltage sampling device according to claim 1, characterized in that, The target voltage signal, the first sampling signal, and the third sampling signal are all differential signals.

6. The voltage sampling device according to claim 5, characterized in that, The compensation circuit is further configured to extract a common-mode signal from the third sampled signal and use the extracted common-mode signal as the interference signal in the first sampled signal.

7. The voltage sampling device according to claim 5, characterized in that, The amplifier circuit includes a second compensation network, and the second compensation network includes a second adjustable capacitor; wherein... The second compensation network is used to adjust the gain slope of the amplifier circuit by adjusting the second adjustable capacitor to perform gain compensation on the amplifier circuit, the gain compensation being used to make the gain of the amplifier circuit within a second range.

8. An ablation system, characterized in that, include: The ablation device and the voltage sampling device according to any one of claims 1 to 7, wherein the ablation device performs tissue ablation by receiving a target sampling signal from the voltage sampling device.

9. A voltage sampling method, characterized in that, Applications in voltage sampling devices include: The target voltage signal is sampled by a sampling circuit, and the amplitude of the sampled signal is compensated based on the frequency of the target voltage signal during the sampling process to obtain a first sampled signal; the amplitude compensation is used to make the ratio of the amplitude of the first sampled signal to the amplitude of the target voltage signal within a first range. The first sampled signal is processed to obtain the second sampled signal; Extract the interference signal from the first sampled signal, and generate a compensation signal based on the interference signal; The second sampled signal and the compensation signal are subtracted to obtain the target sampled signal, and the target sampled signal is output. The step of processing the first sampled signal to obtain the second sampled signal includes: The first sampled signal is amplified to obtain the third sampled signal; The third sampled signal is converted into a single-ended signal to obtain the second sampled signal; The generation of the compensation signal based on the interference signal includes: The interference signal is converted into a differential signal, and the amplitude of the differential signal is adjusted to obtain the compensation signal.

10. The voltage sampling method according to claim 9, characterized in that, The sampling circuit includes a first sampling circuit and a second sampling circuit, and the first sampling circuit and the second sampling circuit have the same structure; the target voltage signal includes a first voltage signal and a second voltage signal, the first sampling circuit corresponds to the first voltage signal, the second sampling circuit corresponds to the second voltage signal, and the first voltage signal and the second voltage signal are voltage signals with equal amplitude and opposite phase.

11. The voltage sampling method according to claim 10, characterized in that, Both the first sampling circuit and the second sampling circuit include a sampling network and a first compensation network. The sampling network is connected in parallel with the first compensation network. The sampling network is used to sample the voltage signal. The first compensation network is used to perform amplitude compensation on the signal being sampled by the sampling network to obtain a sampled signal. The sampled signal obtained by the first sampling circuit has the same amplitude and opposite phase to the sampled signal obtained by the second sampling circuit.

12. The voltage sampling method according to claim 11, characterized in that, The sampling network further includes a first adjustable resistor, which is used to adjust the DC voltage division ratio between the first sampling circuit and the second sampling circuit; the first compensation network includes a first adjustable capacitor, which is used to adjust the AC voltage division ratio between the first sampling circuit and the second sampling circuit.

13. The voltage sampling method according to claim 9, characterized in that, The target voltage signal, the first sampling signal, and the third sampling signal are all differential signals.

14. The voltage sampling method according to claim 13, characterized in that, Extracting interference signals from the first sampled signal includes: The common-mode signal is extracted from the third sampled signal, and the extracted common-mode signal is used as the interference signal in the first sampled signal.

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