Low-temperature plasma operation control system and plasma operation equipment

Abstract

The invention discloses a low-temperature plasma operation control system and plasma operation equipment, and relates to the technical field of medical equipment, and the low-temperature plasma operation control system comprises a power supply input end, a power conversion module, a switching output module, a multi-stage current protection circuit, a multi-stage voltage protection circuit and a driving control module, the power conversion module comprises a first power circuit, an energy pool and a second power circuit which are sequentially connected in series; the switching output module is used for outputting different output powers to the working electrode; the multi-stage current protection circuit samples current output by the first power circuit, the second power circuit and the switching output module and outputs corresponding current sampling signals; the multi-stage voltage protection circuit samples the voltage of the energy pool and outputs a corresponding voltage sampling signal; and the driving control module outputs a corresponding driving control signal to the power conversion module according to the current sampling signal and the voltage sampling signal so as to adjust the magnitude of the output power. The invention aims to improve the safety and stability of operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a low-temperature plasma surgery control system and plasma surgery equipment. Background Art

[0002] Currently, high-frequency surgical equipment (such as high-frequency electrosurgical units and low-temperature plasma surgical systems) is widely used in various minimally invasive surgical procedures. Their core operating principle is to apply high-frequency current to human tissue, achieving functions such as cutting, coagulation, or ablation. Due to limitations in power supply technology and the performance of power devices, most current high-frequency surgical equipment uses a single fixed-frequency output, commonly in the form of a 100kHz square wave or a 450kHz sine wave. Existing high-frequency surgical equipment generally employs relatively simple power output protection schemes, lacking intelligent adjustment and multiple safety mechanisms for varying frequencies and load conditions. This makes it difficult to meet the higher safety, precision, and versatility requirements of modern surgical procedures. Some manufacturers integrate a low-frequency (100kHz square wave) switching power supply circuit and a high-frequency (450kHz sine wave) switching power supply into a single device. The operator selects the power supply according to their needs, switching it internally via relays. This allows the plasma device to output two operating frequencies. However, this requires two power supply systems, reducing stability and safety. Summary of the Invention

[0003] The main purpose of the present invention is to provide a low-temperature plasma surgery control system and plasma surgery equipment, aiming to improve the safety and stability of the operation.

[0004] To achieve the above objectives, the present invention proposes a low-temperature plasma surgery control system, which includes: Power input terminal, used to access the power supply voltage; A power conversion module includes a first power circuit, an energy pool, and a second power circuit connected in series; an input terminal of the first power circuit is connected to the power input terminal, the first power circuit is configured to convert the power supply voltage and output it to the energy pool, and the energy pool is configured to store energy to provide energy to the second power circuit; a switching output module, wherein the input end of the switching output module is connected to the output end of the power conversion module, and the output end of the switching output module is connected to the working electrode, and is used to output different output powers to the working electrode; a multi-stage current protection circuit, wherein the input end of the multi-stage current protection circuit is respectively electrically connected to the output end of the first power circuit, the output end of the second power circuit, and the output end of the switching output module, and is configured to sample the current output by the first power circuit, the second power circuit, and the switching output module, and output a corresponding current sampling signal; A multi-stage voltage protection circuit, used to sample the voltage of the energy pool and output a corresponding voltage sampling signal; The drive control module is used to output a corresponding drive control signal to the power conversion module according to the current sampling signal and the voltage sampling signal, so as to adjust the output power.

[0005] In one embodiment, the drive control module includes: A control circuit, configured to output a corresponding control signal according to the current sampling signal and the voltage sampling signal; a modulation circuit, wherein a controlled end of the modulation circuit is electrically connected to the control circuit and is configured to output a corresponding drive control signal according to the control signal; A drive circuit, wherein the controlled end of the drive circuit is electrically connected to the modulation circuit, and the output end of the drive circuit is electrically connected to the first power circuit and the second power circuit respectively, for outputting corresponding drive signals to the first power circuit and the second power circuit according to the drive control signal.

[0006] In one embodiment, the multi-level current protection circuit includes at least a first-level current protection circuit, a second-level current protection circuit, a third-level current protection circuit, a fourth-level current protection circuit, and a fifth-level current protection circuit; Wherein, the multiple current protection circuits each include: AC transformer, used to collect current signals; A rectifier and filter circuit, configured to rectify and filter the current signal and then output a corresponding DC filtered signal; a comparator, wherein the negative terminal of the comparator is electrically connected to the output terminal of the rectifier and filter circuit, the positive terminal of the comparator is used to receive a reference current value, the comparator is used to compare the current value corresponding to the DC filter signal with the reference current value, and output a corresponding current comparison result to the control circuit and / or the modulation circuit; The control circuit is configured to stop outputting a drive control signal to the modulation circuit according to the current comparison result, so that the modulation circuit controls the drive circuit to stop outputting the drive signal, disconnecting the electrical connection between the power conversion module and the working electrode, and outputting a corresponding control signal according to the current comparison result; The modulation circuit is used to output a corresponding drive control signal to the drive circuit according to the current comparison result and / or the control signal, so that the drive circuit outputs drive signals of different sizes to the first power circuit.

[0007] In one embodiment, the multi-stage voltage protection circuit includes: a first voltage sampling circuit, configured to collect the output voltage of the energy pool and output a corresponding first voltage sampling signal to the control circuit; The control circuit is configured to output a control signal to the modulation circuit according to a correspondence between the first voltage sampling signal and a preset power value, so that the modulation circuit outputs a corresponding drive control signal to the drive circuit according to the control signal, and controls the drive circuit to output drive signals of different magnitudes to the first power circuit and the second power circuit; a second voltage sampling circuit, configured to collect the output voltage of the energy pool and output a corresponding second voltage sampling signal to the modulation circuit; The modulation circuit is used to output a corresponding drive control signal to the drive circuit according to the second voltage sampling signal, so that the drive circuit stops outputting the drive signal to the second power circuit.

[0008] In one embodiment, the first voltage sampling circuit and the second voltage sampling circuit both include: A voltage sampling module is electrically connected to the energy pool and outputs a corresponding voltage sampling signal; A filter circuit, configured to filter the voltage sampling signal and then output a corresponding filtered signal; A comparison circuit, wherein the negative input terminal of the comparison circuit is electrically connected to the output terminal of the filter circuit, the positive input terminal of the comparison circuit is connected to the reference voltage value, and the comparison circuit is used to compare the voltage value corresponding to the filtered signal with the reference voltage value and output the corresponding voltage comparison result.

[0009] In one embodiment, the switching output module includes: a voltage conversion module, electrically connected to the output terminal of the second power circuit, configured to perform voltage conversion on the signal output by the second power circuit according to a preset voltage ratio and then output a target voltage signal; a first output filter circuit and a second output filter circuit, wherein the input ends of the first output filter circuit and the second output filter circuit are respectively electrically connected to the output end of the voltage conversion module, and the output ends of the first output filter circuit and the second output filter circuit are respectively electrically connected to the working electrode; The first output filter circuit is used to filter the target voltage signal and then output a first output power to the working electrode; The second output filter circuit is used for filtering the target voltage signal and then outputting a second output power to the working electrode; The first output power is greater than or equal to the second output power.

[0010] In one embodiment, the multi-level current protection circuit includes at least a first-level current protection circuit, a second-level current protection circuit, a third-level current protection circuit, a fourth-level current protection circuit and a fifth-level current protection circuit; the first-level current protection circuit is electrically connected to the output end of the first power circuit, the second-level current protection circuit is electrically connected to the output end of the second power circuit, the third-level current protection circuit is electrically connected to the output end of the voltage conversion module, the input ends of the fourth-level current protection circuit and the fifth-level current protection circuit are both electrically connected to the output end of the third-level current protection circuit, the output end of the fourth-level current protection circuit is electrically connected to the input end of the first output filter circuit, and the output end of the fifth-level current protection circuit is electrically connected to the input end of the second output filter circuit.

[0011] In one embodiment, the control circuit specifically includes: Controller; an analog-to-digital converter, configured to perform analog-to-digital conversion on the current sampling signal and the voltage sampling signal, and then output corresponding current digital signals and voltage digital signals to the controller; The controller is used to process the current digital signal and the voltage digital signal and then output a corresponding driving control signal to the power conversion module to adjust the output power.

[0012] In one embodiment, the low-temperature plasma surgery control system further includes: an electrode identification circuit, the electrode identification circuit being used to detect the working voltage value of the working electrode and output a corresponding voltage detection signal to the drive control module; The drive control module is used to determine the type of the working electrode according to the working voltage value, and output a corresponding drive control signal to the power conversion module according to the type, so as to output the output power matching the type. The present invention further provides a plasma surgical device, comprising the low-temperature plasma surgical control system described above, and a working electrode, wherein the working electrode is electrically connected to the output end of the switching output module in the low-temperature plasma surgical control system. In practical applications, the present invention can achieve effective power output at two different frequencies, flexibly switch between the two different frequencies, and provide necessary energy regulation and support through the first power circuit to ensure that the second power circuit can operate stably at different frequencies. The drive control module receives sampled output data from the multi-stage current protection circuit and the multi-stage voltage protection circuit, and calculates the appropriate drive control signal in combination with the internal algorithm, thereby adjusting the working state of the first power circuit and the second power circuit. That is, by adapting the first power circuit and the second power circuit, the first power circuit and the second power circuit can both operate stably at two different basic frequencies, ensuring that the output power can meet the surgical requirements and be within a safe range. In this way, while meeting various surgical requirements, reliable safety protection measures are provided, improving the safety and stability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0014] Figure 1 This is a schematic diagram of a circuit module of an embodiment of a low-temperature plasma surgery control system of the present invention; Figure 2 This is a schematic diagram of a circuit module of another embodiment of the low-temperature plasma surgery control system of the present invention; Figure 3 This is a schematic diagram of a circuit module of another embodiment of a low-temperature plasma surgery control system of the present invention; Figure 4 This is a schematic diagram of a circuit module of yet another embodiment of a low-temperature plasma surgery control system according to the present invention; Figure 5 This is a specific circuit diagram of an embodiment of a multi-stage current protection circuit in a low-temperature plasma surgery control system of the present invention; Figure 6 This is a specific circuit diagram of another embodiment of a multi-stage current protection circuit in a low-temperature plasma surgery control system of the present invention; Figure 7 This is a specific circuit diagram of an embodiment of a multi-level voltage protection circuit in a low-temperature plasma surgery control system of the present invention; Figure 8 This is a specific circuit diagram of an embodiment of a multi-level voltage protection circuit in a low-temperature plasma surgery control system of the present invention. Description of Figure Numbers: 100. Power input terminal; 200. Power conversion module; 210. First power circuit; 220. Energy pool; 230. Second power circuit; 300. Switching output module; 400. Multi-level current protection circuit; 410. First-level current protection circuit; 420. Second-level current protection circuit; 430. Third-level current protection circuit; 440. Fourth-level current protection circuit; 450. Fifth-level current protection circuit; 500. Multi-level voltage protection circuit; 510. First voltage sampling circuit; 520. Second voltage sampling circuit; 600. Drive control module; 610. Control circuit; 620. Modulation circuit; 630. Drive circuit; 631. First-level drive circuit; 632. Second-level drive circuit. The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0016] It should be noted that in this article, step codes such as S100 and S200 are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial limitation on the order. When implementing the step, those skilled in the art may execute S200 first and then S100, etc., but these should all be within the scope of protection of this application. Low-temperature plasma surgery utilizes a radiofrequency electric field of a specific frequency to excite a saline electrolyte, forming a thin layer of chloride and sodium ions of a certain thickness on the surface of the transmitting electrode. This thin layer of excited chloride and sodium ion particles is called a plasma. The radiofrequency field imparts sufficient kinetic energy to the plasma, which impacts biological tissue cells within the electrode region, disrupting their molecular structure and causing the target tissue cells to disintegrate molecularly, thereby achieving both cutting and ablation. Furthermore, the surgical system can output radiofrequency energy at a low level, primarily to achieve a thermal effect that can be exploited to achieve tissue hemostasis. Low-temperature plasma surgery offers significant advantages over traditional surgical methods. Endoscopes play a crucial role in minimally invasive surgery. The operator simultaneously controls the endoscope and the low-temperature plasma blade. The endoscope locates the surgical target and simultaneously controls the low-temperature plasma blade to achieve the desired surgical objectives, such as cutting, hemostasis, and ablation. During low-temperature plasma surgery, the two instruments are independently controlled. Since the surgery uses physiological saline as the medium, when the plasma blade is immersed in physiological saline, it stimulates sodium chloride to produce an effective plasma layer for surgery. During the surgery, the sodium chloride is ionized and produces bubbles, which affects the surgical field of view, and there is a risk of collision between the plasma blade and the endoscope lens during the surgery. Since the wall of a general endoscope is made of metal, the energy of the plasma blade will be instantly discharged through the wall of the endoscope. The instantaneous energy discharge is accompanied by a transient large current. This energy will cause the endoscope lens to be punctured and damaged, and will also pose a safety risk to the surgical operator and the patient. Therefore, the design of power output protection is particularly important.

[0017] Due to limitations in power supply technology and device characteristics, current high-frequency surgical equipment (such as high-frequency electrosurgical units and low-temperature plasma surgical equipment) mostly utilize a single, fixed output frequency, such as a 100 kHz square wave or a 450 kHz sine wave. Due to its unique operating mechanism, low-temperature plasma surgical equipment, when operating in "cutting" mode, generates less heat at the blade due to the short rise / fall time of the square wave's output. More energy is converted into charged ion cutting energy, resulting in a lower operating temperature at the blade and less thermal damage to the surgical site. However, due to the low operating frequency, low-frequency current can easily induce nerve stimulation during certain surgical procedures. For example, this can induce spinal nerve reflexes (instant pain) during transforaminal endoscopic lumbar discectomy and obturator nerve reflexes (instant convulsions) during urological surgery. These procedures require plasma surgical equipment to operate at a higher frequency to avoid nerve stimulation. When low-temperature plasma surgical equipment operates at a higher output frequency (such as 450KHz), the plasma equipment's output power is converted into more heat, resulting in higher temperatures at the blade, making it unsuitable for surgeries such as those involving the ear, nose, and throat (ENT) that require lower cutting temperatures. To address this issue, some manufacturers have integrated a low-frequency (100KHz square wave) switching power supply circuit and a high-frequency (450KHz sine wave) switching power supply into one device. The operator selects the power supply according to their needs, and the power supply is switched internally via a relay. This method achieves the goal of two operating frequencies in one plasma device, and to some extent, it also addresses the difficulty of balancing nerve stimulation and thermal damage in single-frequency plasma surgery. However, it requires two power supply systems, which reduces the stability and safety of the power supply system.

[0018] For this purpose, refer to Figure 1 The present invention provides a low-temperature plasma surgery control system, which includes: A power input terminal 100 is used to connect to the power supply voltage; The power conversion module 200 includes a first power circuit 210, an energy pool 220, and a second power circuit 230 connected in series. The input terminal of the first power circuit 210 is connected to the power input terminal 100. The first power circuit 210 is used to convert the power supply voltage and output it to the energy pool 220. The energy pool 220 is used to store energy to provide energy for the second power circuit 230. A switching output module 300, wherein the input end of the switching output module 300 is connected to the output end of the power conversion module 200, and the output end of the switching output module 300 is connected to the working electrode, for outputting different output powers to the working electrode; a multi-stage current protection circuit 400, wherein the input end of the multi-stage current protection circuit 400 is respectively electrically connected to the output end of the first power circuit 210, the output end of the second power circuit 230, and the output end of the switching output module 300, and is configured to sample the current output by the first power circuit 210, the second power circuit 230, and the switching output module 300, and output a corresponding current sampling signal; A multi-stage voltage protection circuit 500 is used to sample the voltage of the energy pool 220 and output a corresponding voltage sampling signal; The driving control module 600 is configured to output a corresponding driving control signal to the power conversion module 200 according to the current sampling signal and the voltage sampling signal, so as to adjust the output power.

[0019] In this embodiment, the power input terminal 100 can be connected to the grid voltage, and the low-temperature plasma surgery control system can also include a rectifier circuit for rectifying the grid voltage and outputting it to the power conversion module 200. The first power circuit 210 and the second power circuit 230 can both be implemented using switching tubes, such as IGBTs, MOS tubes, GaN tubes, etc. The energy pool 220 can be a supercapacitor or a group of high-capacity electrolytic capacitors, which are used to temporarily store energy transmitted from the first power circuit 210 and release it to the second power circuit 230 when needed. The switching output module 300 can be implemented by a switching circuit. In this embodiment, the switching circuit can be implemented by a relay such as a high-speed relay or a solid-state relay, or the switching tube mentioned above, which can quickly respond and switch the output power at different frequencies to the working electrode. It should be noted that the switching switch module can also be equipped with a filter to purify the output signal and avoid electromagnetic interference. The current protection circuit can be implemented using a current sampling module and peripheral circuits. The current sampling module includes at least one of an AC transformer, a Hall effect sensor, and a shunt. The peripheral circuits may include a rectifier, a comparator, and the like. The AC transformer is used to detect the current output by at least one of the first power circuit 210, the second power circuit 230, and the switching output module 300. After rectification, the current is output to the comparator, which compares it with a preset current threshold. The comparison result is output to the drive control module 600. Once the current exceeds the safety range corresponding to the preset current threshold, the drive control module 600 triggers a protection mechanism, such as cutting off the power supply or reducing the output power. The multi-level voltage protection circuit 500 can be implemented using a voltage acquisition circuit and peripheral circuits. The voltage acquisition circuit can be implemented using a voltage-dividing resistor network, a voltage transformer, or the like. The peripheral circuitry corresponding to the voltage protection circuit can be implemented using a filter circuit, an analog-to-digital conversion circuit, or the like. The filter circuit filters the voltage output by the voltage acquisition circuit and outputs it to the analog-to-digital conversion circuit. The analog-to-digital conversion circuit then performs analog-to-digital conversion and outputs a corresponding digital signal to the drive control module 600. When the drive control module 600 detects an overvoltage condition, it issues a corresponding control instruction to shut down the output to prevent overvoltage damage to the device. The drive control module 600 can be implemented using a control circuit 610 and a drive circuit 630. The control circuit 610 receives the output signal from at least one of the multi-stage current protection circuit 400 and the multi-stage voltage protection circuit 500, processes it accordingly, and then outputs a corresponding control signal to the drive circuit 630, thereby controlling the drive circuit 630 to drive the corresponding first power circuit 210 and second power circuit 230.The control circuit 610 can be implemented using a main controller, such as an MCU, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), a PLC, or a SOC (System on Chip). The drive circuit 630 can be implemented using a drive circuit 630 composed of discrete components such as transistors, diodes, resistors, and capacitors, an integrated driver chip, an optocoupler isolation driver, or the like.

[0020] In this embodiment, the drive control module 600 can output corresponding control signals based on the received trigger signal to control the operation of the first power circuit 210 and the second power circuit 230. A specific description will be given by taking the example of the first power circuit 210 and the second power circuit 230 both being IGBT tubes. The drive control module 600 adjusts the switching frequency and duty cycle of the IGBT in the first power circuit 210 based on the trigger signal, thereby adjusting the output voltage level to meet the needs of the energy pool 220. At the same time, the drive control module 600 can also change the switching frequency of the IGBT in the second power circuit 230 to output the energy of the energy pool 220. For example, for the 100KHz operating mode, the drive control module 600 needs to control the IGBT to switch quickly at the first frequency; while in the 450kHz mode, a higher switching speed is required, so the drive control module 600 needs to control the IGBT to switch quickly at the second frequency. The first frequency is lower than the second frequency, and both are set in advance by the R&D personnel. In addition, the drive control module 600 can output corresponding control signals to the first power circuit 210 and the second power circuit 230 based on the output results of the multi-stage current protection circuit and the multi-stage voltage protection circuit 500. These protection circuits ensure that energy output can be safely controlled even at different operating frequencies, preventing damage to the patient or surgical instruments. For example, when the drive control module 600 determines that the voltage of the energy pool 220 is higher than a preset voltage threshold based on the voltage sampling signal output by the voltage protection circuit corresponding to the energy, the duty cycle of the IGBT in the first power circuit 210 can be reduced, thereby reducing the energy input to the energy pool 220 per unit time. Alternatively, the operating state of the IGBT in the second power circuit can be adjusted (e.g., by increasing the output power) to accelerate the discharge of the energy pool 220 and quickly reduce the voltage by actively consuming excess energy in the energy pool 220. In this way, the charging rate of the energy pool 220 is reduced, thereby suppressing further voltage increases.

[0021] It should be noted that the trigger signal received by the drive control module 600 can be a trigger signal output by an operator triggering a button, key, or other trigger component on the plasma surgical device. For example, the plasma surgical device is provided with at least a first trigger key for activating the 100 kHz output mode and a second trigger key corresponding to the 450 kHz output mode. The operator can select the corresponding key according to actual needs. Alternatively, the trigger signal can be a signal output by the operator via a computer device that is communicatively connected to the plasma surgical device. Alternatively, the trigger signal can be a signal output by a foot switch on the plasma surgical device. For example, the plasma surgical device is provided with at least two foot switches, one corresponding to the 100 kHz and the other to the 450 kHz output modes. During surgery, the operator can change the output mode by pressing the foot switch without interrupting the current operation. To switch to 100 kHz mode, the operator lightly presses the first foot switch. To switch to 450 kHz mode, the operator simply presses the second foot switch, and the system automatically completes the mode switch. Alternatively, the plasma surgical device can be provided with a single foot switch, and the user can change the output mode by pressing it once or twice.

[0022] In practical applications, the present invention can achieve effective power output at two different frequencies, flexibly switch between the two different frequencies, and provide necessary energy regulation and support through the first power circuit 210 to ensure that the second power circuit 230 can operate stably at different frequencies. The drive control module 600 receives sampled output data from the multi-stage current protection circuit 400 and the multi-stage voltage protection circuit 500, and calculates a suitable drive control signal in combination with an internal algorithm, thereby adjusting the working state of the first power circuit 210 and the second power circuit 230. That is, by adapting the first power circuit 210 and the second power circuit 230, the first power circuit 210 and the second power circuit 230 can both operate stably at two different basic frequencies, ensuring that the output power can meet the surgical requirements while being within a safe range. In this way, while meeting various surgical requirements, reliable safety protection measures are provided, improving the safety and stability of the operation. In another embodiment, reference Figure 2 , the drive control module 600 includes: A control circuit 610, configured to output a corresponding control signal according to the current sampling signal and the voltage sampling signal; a modulation circuit 620, wherein a controlled end of the modulation circuit 620 is electrically connected to the control circuit 610 and is configured to output a corresponding driving control signal according to the control signal; The driving circuit 630 has a controlled end electrically connected to the modulation circuit 620, and an output end electrically connected to the first power circuit 210 and the second power circuit 230, respectively, for outputting corresponding driving signals to the first power circuit 210 and the second power circuit 230 according to the driving control signal.

[0023] In this embodiment, the control circuit 610 and the modulation circuit 620 can both be implemented using the main controller described in the above embodiment. In this embodiment, the control circuit 610 selects MCU, the modulation circuit 620 selects a dedicated PWM controller IC, and the drive circuit 630 can be implemented using the drive circuit 630 described in the above embodiment.

[0024] When the low-temperature plasma surgical control system is powered on, the MCU performs a self-test to confirm that all circuit modules are operating normally. The multi-level current protection circuit 400 and the multi-level voltage protection circuit 500 continuously monitor the status of the first power circuit 210, the second power circuit 230, and the energy pool 220. The MCU analyzes this data in real time to determine whether output power adjustment or protective measures are currently required. For example, when the voltage of the energy pool 220 is detected approaching a preset threshold, the MCU calculates new PWM parameters (including at least frequency and duty cycle) and sends them to the PWM control circuit 610. Upon receiving the control command from the MCU, the PWM control circuit 610 immediately updates its PWM output signal. The driver circuit 630 then controls the IGBTs corresponding to the first and second power circuits 210, 230 based on the PWM output signal. In actual applications, for different operating modes (100 kHz or 450 kHz), the MCU adjusts the PWM frequency accordingly to suit the IGBT operating conditions. If an abnormal condition (such as overvoltage or overcurrent) occurs, the MCU quickly issues a protection command to shut down the relevant IGBTs or adjust their operating parameters to prevent damage to the control system. In addition, all protection actions can also be recorded by the control circuit 610 in the internal memory for subsequent maintenance reference. In one embodiment, reference Figure 4 、 Figure 5 and Figure 6 , the multi-level current protection circuit 400 includes at least a first-level current protection circuit 410, a second-level current protection circuit 420, a third-level current protection circuit 430, a fourth-level current protection circuit 440 and a fifth-level current protection circuit 450; Wherein, the multiple current protection circuits each include: AC transformer, used to collect current signals; A rectifier and filter circuit, configured to rectify and filter the current signal and then output a corresponding DC filtered signal; a comparator, wherein the negative terminal of the comparator is electrically connected to the output terminal of the rectifier and filter circuit, and the positive terminal of the comparator is used to receive a reference current value. The comparator is used to compare the current value corresponding to the DC filter signal with the reference current value and output the corresponding current comparison result to the control circuit 610 and / or the modulation circuit 620; The control circuit 610 is configured to stop outputting the drive control signal to the modulation circuit 620 according to the current comparison result, so that the modulation circuit 620 controls the drive circuit 630 to stop outputting the drive signal and disconnect the power conversion module 200 from the working electrode, and to output a corresponding control signal according to the current comparison result; The modulation circuit 620 is configured to output a corresponding driving control signal to the driving circuit 630 according to the current comparison result and / or the control signal, so that the driving circuit 630 outputs driving signals of different magnitudes to the first power circuit 210 .

[0025] In this embodiment, the AC transformer CT is used to collect the current signal, and the rectification and filtering circuit can be implemented using a rectification circuit and a filtering circuit, which outputs a corresponding DC signal after rectifying and filtering the current signal; the comparator OP1 compares the current value corresponding to the DC signal with the reference current value, and outputs the corresponding current comparison result to the control circuit 610 and / or the modulation circuit 620.

[0026] refer to Figure 3The first-stage current protection circuit 410 is disposed between the first power circuit 210 (first-stage power circuit) and the second power circuit 230 (second-stage power circuit). The first-stage current protection circuit 410 is primarily responsible for monitoring the energy flow from the first power circuit 210 to the energy pool 220. Because this circuit carries the high energy current after conversion from the primary power supply, it requires monitoring to prevent overload or short circuit conditions. The second-stage current protection circuit 420 is disposed at the output of the second power circuit 230 to monitor the energy flow from the second power circuit 230 to subsequent circuits. The output characteristics of the second power circuit 230 directly impact the final surgical outcome. Monitoring the output current of the second power circuit 230 ensures that the second power circuit 230 is not damaged by excessive load current. In this embodiment, an output transformer is also disposed at the output of the second-stage current protection circuit 420. The output transformer serves as a pre-processor component for the third-stage current protection circuit 430 and is connected to the input of the third-stage current protection circuit 430. The output transformer adjusts the output voltage of the second power circuit 230 to a voltage level suitable for the current use of the surgical instrument while also providing electrical isolation for enhanced safety. Transmitting signals through magnetic coupling helps suppress common-mode interference and improve the overall system's anti-interference capabilities. The third-level current protection circuit 430 further monitors the current after conversion by the output transformer to ensure that even after electrical isolation, no excessive current enters the subsequent circuit, preventing current anomalies caused by transformer failure or other reasons from affecting the safe operation of the switching output module 300. The output ends of the third-level current protection circuit are respectively connected to the fourth-level current protection circuit 440 and the fifth-level current protection circuit 450. The output ends of the fourth-level current protection circuit 440 and the fifth-level current protection circuit 450 are both electrically connected to the switching output module 300. Considering that different surgical applications may require different frequency operating modes (such as 100KHz and 450kHz), these two-level current protection circuits can perform targeted monitoring and protection to ensure operational safety in each mode.

[0027] It should be noted that the principle of the second-level current protection is the same as that of the first-level circuit protection, but the control path is different. That is, the first-level current protection is set between the first power circuit 210 (first-level power circuit) and the second power circuit 230 (second-level power circuit), and the second-level current protection circuit 420 is set at the output end of the second power circuit 230.

[0028] refer to Figure 5In this embodiment, the rectifier circuit is implemented using a rectifier bridge composed of diodes D1, D2, D3, and D4. The operating principle of the first-stage current protection circuit 410 is used as an example for explanation. The AC transformer CT collects the output current signal of the first power circuit 210, rectifies it through the rectifier circuit, and then filters it, outputting a corresponding DC filtered signal to the comparator OP1. The comparator compares the DC filtered signal with the reference current value (protection value) connected to the positive terminal and divides the current comparison result into two outputs. One output is sent to the control circuit 610 MCU. Based on the energy corresponding to the trigger signal, the control circuit 610 controls the drive circuit 630 through the DAC module and the frequency / PWM control circuit, thereby controlling the output of the first power circuit 210 and the second power circuit 230, including whether to shut down the output. The other output is sent to the modulation circuit 620, i.e., the frequency / PWM control circuit, so that the frequency / PWM control circuit controls the drive circuit 630, thereby controlling the output power of the first-stage power circuit.

[0029] It should be noted that, in this embodiment, the drive circuit 630 includes a first-stage drive circuit 631 and a second-stage drive circuit 632. The output end of the first-stage drive circuit 631 is connected to the first power circuit 210 for driving the first power circuit 210. The output end of the second-stage drive circuit 632 is connected to the second power circuit 230 for driving the second power circuit 230. For the first-stage current protection circuit 410, the frequency / PWM control circuit controls the first-stage drive circuit 631, thereby controlling the output power of the first-stage power circuit.

[0030] Similarly, taking the working principle of the second-stage current protection circuit 420 as an example, the AC transformer CT collects the output current signal of the second power circuit 230, rectifies it through the rectifier circuit, and then filters it to output the corresponding DC filtered signal to the comparator OP1. The comparator compares the DC filtered signal with the reference current value (protection value) connected to the positive terminal and divides the current comparison result into two outputs. One current comparison result is output to the control circuit 610 MCU. The control circuit 610 controls the drive circuit 630 based on the energy corresponding to the trigger signal through the DAC module and frequency / PWM control circuit, thereby controlling the output of the first power circuit 210 and the second power circuit 230, including whether to shut down the output. The other output is output to the modulation circuit 620, i.e., the frequency / PWM control circuit, so that the frequency / PWM control circuit controls the second-stage drive circuit 632, thereby controlling the output power of the second-stage power circuit.

[0031] In this embodiment, the fourth level current protection circuit 440 includes Figure 4 The fourth level current protection circuit 1 and the fifth level current protection circuit 450 include Figure 4The fourth level current protection 2 in the circuit has the same working principle as the third level current protection circuit, but the control path is different. Figure 6 The circuits of the third-level current protection circuit 430, the fourth-level current protection circuit 440, and the fifth-level current protection circuit can be implemented using the same circuit structure as the first-level current protection circuit 410 and the second current protection circuit, but the output paths of the third-level current protection circuit, the fourth-level current protection circuit 440, and the fifth-level current protection circuit 450 are different from those of the first two-level current protection circuits.

[0032] Taking the working principle of the third-level current protection circuit 430 as an example, the AC transformer collects the signal, rectifies it through the rectifier circuit, and then outputs the corresponding DC filtered signal to the comparator OP1 after filter processing. The comparator compares it with the reference current value (protection value) connected to the positive terminal and outputs the current comparison result to the control circuit 610MCU. The control circuit 610 controls the drive circuit 630 through the modulation circuit 620, that is, the frequency / PWM control circuit, according to the required energy corresponding to the trigger signal, thereby controlling the output power of the first power circuit 210 and the second power circuit 230.

[0033] By implementing a five-level current protection circuit, multi-layer protection is implemented from the pre-stage to the output stage, enhancing system safety. Each level of current protection circuit forms a closed-loop control with the drive control module 600. The MCU dynamically adjusts the output power based on the current sampling signal, enabling flexible energy output regulation. Furthermore, multiple current protection mechanisms effectively reduce the risks of overcurrent, short circuits, and abnormal discharge, ensuring the safety of both patients and equipment. Furthermore, the output transformer partially isolates the main power circuit from the surgical electrode, effectively reducing direct harm to the patient from the high-voltage circuit. In one embodiment, the multi-level voltage protection circuit 500 includes: A first voltage sampling circuit 510 is configured to collect the output voltage of the energy pool 220 and output a corresponding first voltage sampling signal to the control circuit 610 ; The control circuit 610 is configured to output a control signal to the modulation circuit 620 based on a correspondence between the first voltage sampling signal and a preset power value, so that the modulation circuit 620 outputs a corresponding driving control signal to the driving circuit 630 according to the control signal, thereby controlling the driving circuit 630 to output driving signals of different magnitudes to the first power circuit 210 and the second power circuit 230; The second voltage sampling circuit 520 is used to collect the output voltage of the energy pool 220 and output a corresponding second voltage sampling signal to the modulation circuit 620; The modulation circuit 620 is configured to output a corresponding driving control signal to the driving circuit 630 according to the second voltage sampling signal, so that the driving circuit 630 stops outputting the driving signal to the second power circuit 230 .

[0034] The first voltage sampling circuit 510 and the second voltage sampling circuit 520 both include: A voltage sampling module, electrically connected to the energy pool 220 and outputting a corresponding voltage sampling signal; A filter circuit, configured to filter the voltage sampling signal and then output a corresponding filtered signal; A comparison circuit, wherein the negative input terminal of the comparison circuit is electrically connected to the output terminal of the filter circuit, the positive input terminal of the comparison circuit is connected to the reference voltage value, and the comparison circuit is used to compare the voltage value corresponding to the filtered signal with the reference voltage value and output the corresponding voltage comparison result.

[0035] In this embodiment, the voltage sampling module can be implemented using a voltage transformer, a voltage-dividing resistor network, etc. In this embodiment, a voltage-dividing resistor network consisting of a first resistor R1 and a second resistor R2 is selected. The filter circuit can be implemented using a filter circuit consisting of at least one of a resistor, an inductor, and a capacitor.

[0036] refer to Figure 3 and Figure 4 The first voltage sampling circuit 510 (first-stage voltage detection circuit) is electrically connected to the energy pool 220 for real-time monitoring of the energy pool 220's voltage. The second voltage sampling circuit 520 (second-stage voltage detection circuit) is connected to the output of the energy pool 220. It should be noted that both the first voltage sampling circuit 510 and the second voltage sampling circuit 520 sample the energy pool 220's voltage, but their output paths are different. The first voltage sampling circuit 510 monitors the energy pool 220's voltage in real time and outputs a first voltage sampling signal to the ADC module within the control circuit 610 MCU. After analog-to-digital conversion, the signal is converted into a digital signal, which is then processed by the control circuit 610. The second voltage sampling circuit 520 is based on a full hardware design and does not involve the control circuit 610. Its output result is directly output to the modulation circuit 620. After detecting that the energy pool 220 has too much energy, it directly controls the frequency / PWM control circuit to cut off the output of the second power circuit 230, that is, cuts off the subsequent energy output. This process does not require the participation of the MCU control circuit 610, reducing the risk of excessive output energy due to a failure of the control circuit 610, for example, excessive energy output caused by an MCU crash.

[0037] The working principle of the first voltage sampling circuit 510 is specifically described. Figure 7The voltage of energy pool 220 is divided by resistors R1 and R2, reducing the voltage of energy pool 220 and outputting it to the filter circuit. The filter circuit then filters the voltage and outputs it to the ADC module of control circuit 610. After analog-to-digital conversion, it becomes a digital signal. The control circuit 610 MCU can then compare and analyze the collected voltage with a preset power. In this embodiment, a comparator (comparison circuit) within the MCU can be used for comparison. For example, the negative terminal of the comparator is connected to the ADC output, and the positive terminal is connected to a reference voltage corresponding to the preset power. If the comparator output determines that the output voltage is too low, the MCU can directly control the first-stage driver circuit 631 and the second-stage driver circuit 632 to increase their output. Similarly, if the output voltage is too high, the MCU can control the first-stage driver circuit 631 and the second-stage driver circuit 632 to reduce their output.

[0038] The working principle of the second voltage sampling circuit 520 is specifically described. Figure 8 The voltage of the energy pool 220 is divided by the resistors R1 and R2, that is, the voltage of the energy pool 220 is reduced and then output to the filter circuit, so that the filter circuit performs filtering and then outputs it to the comparison circuit, such as the comparator OP2. The comparison circuit compares the voltage value corresponding to the filtered signal of the filter circuit with the reference voltage value, and outputs the corresponding voltage comparison result to the modulation circuit 620. The frequency / PWM control circuit can output the corresponding drive control signal to the drive circuit 630 according to the voltage comparison result. If the current voltage of the energy pool 220 is too high, the frequency / PWM control circuit controls the second-stage drive circuit 632 to stop outputting the drive signal to the second power circuit 230, thereby turning off the output. Compared with the first voltage sampling circuit 510, the second voltage sampling circuit 520 does not require the participation of the control circuit 610 throughout the process, which can prevent the problem of excessive power output caused by special circumstances such as MCU crash or damage.

[0039] The first voltage sampling circuit 510 provides precise voltage feedback for the MCU to regulate power. The second voltage sampling circuit 520, acting as hardware-level protection, promptly cuts off output even if the MCU fails, preventing potential danger and ensuring the control system remains safe even in extreme situations. The combination of the first voltage sampling circuit 510 (software path) and the second voltage sampling circuit 520 (hardware path) improves the reliability and safety of the low-temperature plasma surgery control system. In another embodiment, the switching output module 300 includes: a voltage conversion module, electrically connected to the output terminal of the second power circuit 230, configured to perform voltage conversion on the signal output by the second power circuit 230 according to a preset voltage ratio and then output a target voltage signal; a first output filter circuit and a second output filter circuit, wherein the input ends of the first output filter circuit and the second output filter circuit are respectively electrically connected to the output end of the voltage conversion module, and the output ends of the first output filter circuit and the second output filter circuit are respectively electrically connected to the working electrode; The first output filter circuit is used to filter the target voltage signal and then output a first output power to the working electrode; The second output filter circuit is used for filtering the target voltage signal and then outputting a second output power to the working electrode; The first output power is greater than or equal to the second output power.

[0040] In this embodiment, the voltage conversion module includes the output transformer described in the above-mentioned embodiment. It converts the signal output by the second power circuit 230 according to a preset voltage ratio and outputs a target voltage signal. It also provides electrical isolation between the main power circuit and the working electrode, improving safety. Both the first output filter circuit and the second output filter circuit can be implemented using filters composed of at least one of a resistor, an inductor, and a capacitor. The first output filter circuit performs low-pass filtering on the target voltage signal to remove high-frequency noise and stray harmonics, and outputs an optimized first output power to the working electrode. This is suitable for surgical modes requiring higher power output, such as "cutting" mode. Its filter parameters are designed to retain high-frequency components to ensure output power intensity. The second output filter circuit also filters the target voltage signal and outputs a finely filtered second output power to the working electrode. This is suitable for surgical modes requiring lower power but higher precision, such as "coagulation" or "ablation" modes.

[0041] In combination with the contents of the above embodiments, the multi-level current protection circuit 400 includes at least a first-level current protection circuit 410, a second-level current protection circuit 420, a third-level current protection circuit 430, a fourth-level current protection circuit 440 and a fifth-level current protection circuit 450; the first-level current protection circuit 410 is electrically connected to the output end of the first power circuit 210, the second-level current protection circuit 420 is electrically connected to the output end of the second power circuit 230, the third-level current protection circuit 430 is electrically connected to the output end of the voltage conversion module, the input ends of the fourth-level current protection circuit 440 and the fifth-level current protection circuit 450 are both electrically connected to the output end of the third-level current protection circuit 430, the output end of the fourth-level current protection circuit 440 is electrically connected to the input end of the first output filter circuit, and the output end of the fifth-level current protection circuit 450 is electrically connected to the input end of the second output filter circuit.

[0042] In this embodiment, the control circuit 610 MCU in the control system can determine which output filter circuit to activate based on the operator-selected operating mode (e.g., cutting / coagulation) or an external control signal (e.g., a command from the MCU or computer system). The output transformer's frequency range can be 100 kHz to 500 kHz, and the preset voltage ratio is set by R&D personnel based on actual needs. For this example, the first output filter circuit is an LC low-pass filter, and the second output filter circuit is a π-type filter. The cutoff frequency of the first output filter circuit is set to 500 kHz to retain high-frequency energy and output high power. The cutoff frequency of the second output filter circuit is set to 100 kHz to suppress high-frequency noise and output a smoother, lower-power signal. When the operator presses the "Cut" button, the system activates the first output filter circuit and outputs the first output power. When switching to "Coagulation" mode, the second output filter circuit is activated and outputs the first output power, which results in a lower-power, more stable current.

[0043] By setting up a voltage conversion module including an output transformer and two independent output filtering circuits, it supports two different power level outputs to adapt to different surgical needs, and realizes the isolation, conversion, filtering and distribution of high-frequency energy, thereby meeting the diverse output needs in different surgical scenarios. In one embodiment, the control circuit 610 specifically includes: Controller; an analog-to-digital converter, configured to perform analog-to-digital conversion on the current sampling signal and the voltage sampling signal, and then output corresponding current digital signals and voltage digital signals to the controller; The controller is used to process the current digital signal and the voltage digital signal and then output a corresponding driving control signal to the power conversion module 200 to adjust the output power.

[0044] In conjunction with the above embodiments, the control circuit 610MCU is provided with an analog-to-digital converter (ADC). The output results of each current protection circuit and voltage protection circuit must first be converted by the ADC to digital form before the corresponding digital signals are output to the controller for appropriate processing. The current sampling signal is converted to a current digital signal after analog-to-digital conversion, and the voltage sampling signal is converted to a voltage sampling signal after analog-to-digital conversion. The controller adaptively adjusts the outputs of the first power circuit 210 and the second power circuit 230 based on the current digital signal, voltage digital signal, and current frequency requirements to meet user needs.

[0045] Optionally, the low-temperature plasma surgery control system further includes: An electrode identification circuit, which is used to detect the working voltage value of the working electrode and output a corresponding voltage detection signal to the drive control module 600; The drive control module 600 is used to determine the type of the working electrode according to the working voltage value, and output a corresponding drive control signal to the power conversion module 200 according to the type, so as to output the output power matching the type.

[0046] In this embodiment, different impedance elements (such as resistors, diodes, Zener voltage regulators, etc.) can be integrated inside the working electrode to form different voltage characteristics; the electrode identification circuit can be composed of a voltage divider resistor network and a comparator; it is used to detect the characteristic voltage signal generated by the working electrode after it is connected to the control system; determine which type of electrode is currently connected based on the voltage range; and output the corresponding voltage detection signal to the drive control module 600 (MCU), so that the control circuit 610MCU can identify the electrode model based on the voltage value corresponding to the voltage detection signal by looking up the table, and determine which surgical electrode is currently being used (such as cutting type, coagulation type, ablation type, arthroscopic type, etc.); then, according to the type, call the preset power control parameters (such as output frequency, duty cycle, maximum power limit) that match the current type, so as to control the modulation circuit 620 to adjust the output of the first power circuit 210 and the second power circuit 230 to match the electrode characteristics. For example, when electrode A is connected, the electrode recognition circuit collects 2.5V voltage; when electrode B is connected, the electrode recognition circuit collects 3.3V. The MCU identifies and calls the corresponding control strategy based on this, thereby outputting an energy form suitable for the current electrode operation, such as 100kHz or 450kHz.

[0047] By introducing the electrode recognition circuit, the low-temperature plasma surgical equipment can realize intelligent recognition and automatic power matching of different types of surgical electrodes. It can quickly determine the type of electrode based on its characteristic voltage and dynamically adjust the output parameters in combination with the drive control module 600, thereby improving the safety of the operation. It is suitable for scenarios where frequent electrode replacement is required and the operation is highly complex. The present invention further provides a plasma surgical device, comprising any of the above-mentioned low-temperature plasma surgical control systems, and a working electrode, wherein the working electrode is electrically connected to the output end of the switching output module 300 in the low-temperature plasma surgical control system.

[0048] It is worth noting that since the plasma surgical equipment of the present invention is based on the above-mentioned low-temperature plasma surgical control system, the embodiments of the plasma surgical equipment of the present invention include all technical solutions of all embodiments of the above-mentioned low-temperature plasma surgical control system, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0049] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A low-temperature plasma surgery control system, characterized in that: The low-temperature plasma surgery control system includes: Power input terminal, used to access the power supply voltage; A power conversion module includes a first power circuit, an energy pool, and a second power circuit connected in series; an input terminal of the first power circuit is connected to the power input terminal, the first power circuit is configured to convert the power supply voltage and output it to the energy pool, and the energy pool is configured to store energy to provide energy to the second power circuit; a switching output module, wherein the input end of the switching output module is connected to the output end of the power conversion module, and the output end of the switching output module is connected to the working electrode, and is used to output different output powers to the working electrode; a multi-stage current protection circuit, wherein the input end of the multi-stage current protection circuit is respectively electrically connected to the output end of the first power circuit, the output end of the second power circuit, and the output end of the switching output module, and is configured to sample the current output by the first power circuit, the second power circuit, and the switching output module, and output a corresponding current sampling signal; A multi-stage voltage protection circuit, used to sample the voltage of the energy pool and output a corresponding voltage sampling signal; The drive control module is used to output a corresponding drive control signal to the power conversion module according to the current sampling signal and the voltage sampling signal, so as to adjust the output power.

2. The low-temperature plasma surgery control system according to claim 1, characterized in that: The drive control module includes: A control circuit, configured to output a corresponding control signal according to the current sampling signal and the voltage sampling signal; a modulation circuit, wherein a controlled end of the modulation circuit is electrically connected to the control circuit and is configured to output a corresponding drive control signal according to the control signal; A drive circuit, wherein the controlled end of the drive circuit is electrically connected to the modulation circuit, and the output end of the drive circuit is electrically connected to the first power circuit and the second power circuit respectively, for outputting corresponding drive signals to the first power circuit and the second power circuit according to the drive control signal.

3. The low-temperature plasma surgery control system according to claim 2, characterized in that: The multi-level current protection circuit includes at least a first-level current protection circuit, a second-level current protection circuit, a third-level current protection circuit, a fourth-level current protection circuit and a fifth-level current protection circuit; Wherein, the multiple current protection circuits each include: AC transformer, used to collect current signals; A rectifier and filter circuit, configured to rectify and filter the current signal and then output a corresponding DC filtered signal; a comparator, wherein the negative terminal of the comparator is electrically connected to the output terminal of the rectifier and filter circuit, the positive terminal of the comparator is used to receive a reference current value, the comparator is used to compare the current value corresponding to the DC filter signal with the reference current value, and output a corresponding current comparison result to the control circuit and / or the modulation circuit; The control circuit is configured to stop outputting a drive control signal to the modulation circuit according to the current comparison result, so that the modulation circuit controls the drive circuit to stop outputting the drive signal, disconnecting the electrical connection between the power conversion module and the working electrode, and outputting a corresponding control signal according to the current comparison result; The modulation circuit is used to output a corresponding drive control signal to the drive circuit according to the current comparison result and / or the control signal, so that the drive circuit outputs drive signals of different sizes to the first power circuit.

4. The low-temperature plasma surgery control system according to claim 2, wherein: The multi-stage voltage protection circuit comprises: a first voltage sampling circuit, configured to collect the output voltage of the energy pool and output a corresponding first voltage sampling signal to the control circuit; The control circuit is configured to output a control signal to the modulation circuit according to a correspondence between the first voltage sampling signal and a preset power value, so that the modulation circuit outputs a corresponding drive control signal to the drive circuit according to the control signal, and controls the drive circuit to output drive signals of different magnitudes to the first power circuit and the second power circuit; a second voltage sampling circuit, configured to collect the output voltage of the energy pool and output a corresponding second voltage sampling signal to the modulation circuit; The modulation circuit is used to output a corresponding drive control signal to the drive circuit according to the second voltage sampling signal, so that the drive circuit stops outputting the drive signal to the second power circuit.

5. The low-temperature plasma surgery control system according to claim 4, characterized in that: The first voltage sampling circuit and the second voltage sampling circuit both include: A voltage sampling module is electrically connected to the energy pool and outputs a corresponding voltage sampling signal; A filter circuit, configured to filter the voltage sampling signal and then output a corresponding filtered signal; A comparison circuit, wherein the negative input terminal of the comparison circuit is electrically connected to the output terminal of the filter circuit, the positive input terminal of the comparison circuit is connected to the reference voltage value, and the comparison circuit is used to compare the voltage value corresponding to the filtered signal with the reference voltage value and output the corresponding voltage comparison result.

6. The low-temperature plasma surgery control system according to claim 1, characterized in that: The switching output module includes: a voltage conversion module, electrically connected to the output terminal of the second power circuit, configured to perform voltage conversion on the signal output by the second power circuit according to a preset voltage ratio and then output a target voltage signal; a first output filter circuit and a second output filter circuit, wherein the input ends of the first output filter circuit and the second output filter circuit are respectively electrically connected to the output end of the voltage conversion module, and the output ends of the first output filter circuit and the second output filter circuit are respectively electrically connected to the working electrode; The first output filter circuit is used to filter the target voltage signal and then output a first output power to the working electrode; The second output filter circuit is used for filtering the target voltage signal and then outputting a second output power to the working electrode; The first output power is greater than or equal to the second output power.

7. The low-temperature plasma surgery control system according to claim 6, characterized in that: The multi-level current protection circuit includes at least a first-level current protection circuit, a second-level current protection circuit, a third-level current protection circuit, a fourth-level current protection circuit and a fifth-level current protection circuit; The first-level current protection circuit is electrically connected to the output end of the first power circuit, the second-level current protection circuit is electrically connected to the output end of the second power circuit, the third-level current protection circuit is electrically connected to the output end of the voltage conversion module, the input ends of the fourth-level current protection circuit and the fifth-level current protection circuit are both electrically connected to the output end of the third-level current protection circuit, the output end of the fourth-level current protection circuit is electrically connected to the input end of the first output filter circuit, and the output end of the fifth-level current protection circuit is electrically connected to the input end of the second output filter circuit.

8. The low-temperature plasma surgery control system according to claim 2, wherein: The control circuit specifically includes: Controller; an analog-to-digital converter, configured to perform analog-to-digital conversion on the current sampling signal and the voltage sampling signal, and then output corresponding current digital signals and voltage digital signals to the controller; The controller is used to process the current digital signal and the voltage digital signal and then output a corresponding driving control signal to the power conversion module to adjust the output power.

9. The low-temperature plasma surgery control system according to any one of claims 1 to 8, characterized in that: The low-temperature plasma surgery control system further includes: an electrode identification circuit, the electrode identification circuit being used to detect the working voltage value of the working electrode and output a corresponding voltage detection signal to the drive control module; The drive control module is used to determine the type of the working electrode according to the working voltage value, and output a corresponding drive control signal to the power conversion module according to the type, so as to output the output power matching the type.

10. A plasma surgical device, characterized in that: It comprises the low-temperature plasma surgery control system according to any one of claims 1 to 9, and a working electrode, wherein the working electrode is electrically connected to the output end of the switching output module in the low-temperature plasma surgery control system.

Images