Steam ablation device and its steam generating device

Abstract

The present invention provides a steam ablation device and its steam generating device, which includes a coil, an electrode, a motor for driving the electrode to move to adjust the effective length of the coil connected to its circuit, and a control circuit. The control circuit includes a controller and a sampling circuit. The sampling circuit includes a temperature sampling circuit, a voltage sampling circuit, and a current sampling circuit. Liquid is heated in the coil to be converted into steam. The temperature sampling circuit collects the current temperature of the coil and sends it to the controller. The controller determines the target resistance value of the coil according to the current temperature and the corresponding relationship between the coil temperature and the change in the coil resistance value. The voltage sampling circuit and the current sampling circuit respectively collect the current working voltage and the current working current of the coil and send them to the controller. The controller determines the current resistance value of the coil according to the current working voltage and the current working current, and controls the motor to rotate to drive the electrode to move to the target position according to the difference between the current resistance value and the target resistance value, and adjusts the effective length to correspond to the target resistance value.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a steam ablation device and its steam generating device. Background Art

[0002] A bronchoscope thermal steam generator is a generating device that converts purified water into thermal steam for ablation. The thermal steam generated by it is guided to an ablation catheter and then reaches the diseased lung airways and soft tissues such as over-inflated lesions through a bronchoscope for thermal ablation. Currently, doctors can set the ablation time (the magnitude of the released energy) of the bronchoscope thermal steam generator according to the severity of the patient, so as to achieve the ablation effect.

[0003] However, due to partial energy loss during the heating of the coil, there is an easy deviation value between the magnitude of the energy released set by the doctor and the magnitude of the energy ejected from the coil steam port. Moreover, during the process of converting purified water into thermal steam by the bronchoscope thermal steam generator, as the temperature rises, the resistance value of the coil inevitably increases. With the increase in resistance value, the actual output power decreases, thus the change in resistance value affects the effect of forming thermal steam and to a certain extent affects the ablation effect. Summary of the Invention

[0004] To solve the existing technical problems, the present invention provides a steam ablation device and its steam generating device that can maintain the stable output power of the coil, effectively reduce the deviation, and improve the ablation effect.

[0005] To achieve the above object, the technical solution of the embodiment of the present invention is realized as follows:

[0006] A steam generating device includes a coil with a hollow interior, an electrode electrically connected to the coil, a motor for driving the electrode to move to adjust the effective length of the coil connected to its circuit, and a control circuit for controlling the operation of the motor. The control circuit includes a controller and a sampling circuit connected between the controller and the coil. The sampling circuit includes a temperature sampling circuit, a voltage sampling circuit, and a current sampling circuit. Liquid is heated in the coil to be converted into steam. The temperature sampling circuit collects the current temperature of the coil and sends it to the controller. The controller determines the target resistance value of the coil according to the current temperature and the corresponding relationship between the coil temperature and the change in the coil resistance value. The voltage sampling circuit and the current sampling circuit respectively collect the current working voltage and the current working current of the coil and send them to the controller. The controller determines the current resistance value of the coil according to the current working voltage and the current working current, and controls the motor to rotate to drive the electrode to move to the target position according to the difference between the current resistance value and the target resistance value, and adjusts the effective length to correspond to the target resistance value.

[0007] A steam ablation device includes a steam generating device provided in any embodiment of the present application, a perfusion device communicating with an input port of the coil in the steam generating device, and an ablation catheter communicating with an output port of the coil.

[0008] The steam ablation device and its steam generating device provided in the embodiments of the present invention collect the current temperature of the coil through a temperature sampling circuit and send it to the controller. The controller determines the target resistance value of the coil. The current working voltage and current working current of the coil are collected through a voltage sampling circuit and a current sampling circuit and sent to the controller. The controller determines the current resistance value of the coil. The movement of the electrode is controlled according to the difference between the current resistance value and the target resistance value of the coil to adjust the effective length of the coil connected to its circuit, thereby adjusting the impedance of the coil connected to its circuit and keeping the output power of the coil stable. In this way, during the process of the liquid being heated and converted into steam in the coil, the energy size ejected from the steam outlet of the coil can always be consistent with the energy size set by the doctor for release, ensuring a continuous ablation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0010] Figure 1 It is a schematic diagram of a known steam ablation device;

[0011] Figure 2 It is a schematic diagram of a steam generating device in an embodiment;

[0012] Figure 3 It is a control schematic diagram of a steam generating device in an embodiment;

[0013] Figure 4 It is a circuit schematic diagram of a main control chip in an embodiment;

[0014] Figure 5 It is a circuit schematic diagram of a debugging circuit in an embodiment;

[0015] Figure 6 It is a circuit schematic diagram of a power conversion circuit in an embodiment;

[0016] Figure 7 It is a circuit schematic diagram of a voltage control circuit in an embodiment;

[0017] Figure 8Schematic diagram of the motor drive circuit in an embodiment;

[0018] Figure 9 Schematic diagram of the ambient temperature detection circuit in an embodiment;

[0019] Figure 10 Partial schematic diagram of the anti-static circuit of the power supply feedback circuit in an embodiment;

[0020] Figure 11 Schematic diagram of the circuit of the pin part of the anti-static circuit of the power supply feedback circuit in an embodiment;

[0021] Figure 12 Schematic diagram of the key control circuit in an embodiment;

[0022] Figure 13 Schematic diagram of the voltage sampling circuit in an embodiment;

[0023] Figure 14 Schematic diagram of the current sampling circuit in an embodiment;

[0024] Figure 15 Schematic diagram of the first temperature sampling circuit in an embodiment;

[0025] Figure 16 Schematic diagram of the second temperature sampling circuit in an embodiment. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0028] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The technical solutions of the present invention will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0029] Steam ablation is a new non-implantable bronchoscopic interventional technique. It sends a steam catheter into the target lung tissue identified by high-resolution CT through a bronchoscope, releases a predetermined amount of high-temperature water vapor to generate a thermal reaction on the target lung tissue of the patient, causing acute inflammatory reactions and injury repair in the local lung tissue, resulting in pulmonary fibrosis and scar repair, or forming atelectasis to achieve the purpose of lung volume reduction. Please refer to Figure 1 , the currently known steam ablation device 10 mainly includes a perfusion device 11, a steam generation device 12, an ablation catheter 13, and a connector body 14 connected in sequence. Among them, the connector body 14 is connected to an external gas source, and gas enters the expansion balloon through the ablation catheter 13, causing the expansion balloon to expand to abut against the inner wall of the trachea at the lesion site. The steam generation device 12 is connected to and passes through the expansion balloon from the connector body 14 through the ablation catheter 13, and outputs steam to the lesion site through the ablation catheter 13. The perfusion device 11 is used to perfusion the liquid for forming steam into the coil of the steam generation device 12 to maintain the continuity of steam formation by the steam generation device.

[0030] During the process of converting water into steam by the coil in the steam generation device, the highest temperature reached by the heating coil can be 250 degrees Celsius. The inventors of the present application found in the research that when the temperature is increased by 100 degrees Celsius each time, the resistance value of the coil changes by about 35 milliohms. In order to solve the problem that the change in the resistance value of the coil affects the loss of energy ejected from the steam port of the coil and ensure a constant output heating power, the embodiments of the present invention provide a steam generation device that can automatically adjust the effective impedance of the coil connected to the circuit to keep the output power of the coil constant, so that the energy size ejected from the steam port of the coil can always maintain consistency with the energy size set by the doctor for release, ensuring a continuous ablation effect, and a steam ablation device including the steam generation device.

[0031] Please refer to in combination with Figure 2 and Figure 3, an embodiment of the present invention provides a steam generating device, which includes a coil 120 with a hollow interior, an electrode 121 electrically connected to the coil 120, a motor for driving the electrode 121 to move to adjust the effective length of the coil 120 connected to its circuit, and a control circuit for controlling the operation of the motor 123. The control circuit includes a controller 20 and a sampling circuit connected between the controller 20 and the coil 120. The sampling circuit includes a temperature sampling circuit 24, a voltage sampling circuit 23, and a current sampling circuit 25. Liquid is heated in the coil 120 and converted into steam; the temperature sampling circuit 24 collects the current temperature of the coil 120 and sends it to the controller 20. The controller 20 determines the target resistance value of the coil 120 according to the current temperature and the corresponding relationship between the coil temperature and the change in the coil resistance value; the voltage sampling circuit 23 and the current sampling circuit 25 respectively collect the current working voltage and the current working current of the coil 120 and send them to the controller 20. The controller 20 determines the current resistance value of the coil 120 according to the current working voltage and the current working current, and controls the motor 123 to rotate to drive the electrode 121 to move to the target position according to the difference between the current resistance value and the target resistance value, and adjusts the effective length to correspond to the target resistance value.

[0032] In the above embodiment, the steam generating device collects the current temperature of the coil 120 through the temperature sampling circuit 24 and sends it to the controller 20. The controller 20 determines the target resistance value of the coil 120. The current working voltage and the current working current of the coil 120 are collected through the voltage sampling circuit 23 and the current sampling circuit 25 and sent to the controller 20. The controller 20 determines the current resistance value of the coil 120, and controls the movement of the electrode 121 according to the difference between the current resistance value and the target resistance value of the coil 120, so as to adjust the effective length of the coil 121 connected to its circuit, thereby adjusting the impedance of the coil 121 connected to its circuit and keeping the output power of the coil 120 stable. In this way, during the process of heating the liquid in the coil 120 and converting it into steam, the energy magnitude ejected from the coil steam port can always be kept consistent with the set released energy magnitude, ensuring a continuous ablation effect.

[0033] Among them, the electrode 121 is connected to the lead screw 124 through the electrode clip 122. The lead screw 124 is connected to the output shaft of the motor 123. The electrode clip 122 clamps and fixes the electrode 121 on the lead screw 124. When the output shaft of the motor 123 rotates, it can drive the electrode clip 122 to move along the length extension direction of the lead screw 124. The electrode clip 122 drives the electrode 121 to move, so that the electrode 121 can be adjusted to contact different positions on the coil 120. In this way, the coil 120 can form a slide rheostat, and the electrode 121 connected to the coil 120 serves as the sliding part of the slide rheostat. The motor 123 drives the electrode clip arm 122 to drive the electrode 121 to move along the length direction of the coil 120, realizing the sliding of the sliding part on the slide rheostat to change the resistance value of the slide rheostat. The motor preferably can be a stepper motor. The stepper motor cooperates with the lead screw to control the change of the position of the electrode on the coil, which can accurately control the effective length of the coil connected to its circuit, and correspondingly accurately control the impedance value of the coil connected to its circuit.

[0034] In some embodiments, please refer to Figures 4 to 6 , the controller includes a main control chip U1, a debugging circuit and a power conversion circuit connected to the main control chip U1. The debugging circuit includes a JTAG interface chip J1, a plurality of resistors respectively connecting the test reset terminal, the test data serial input terminal, the test mode selection terminal, the test data serial output terminal, the test clock terminal, the reset signal terminal, and the test clock return signal terminal of the JTAG interface chip, a Schottky diode connecting the plurality of resistors to the electrode ground, and a filter capacitor connected to the power input terminal of the JTAG interface chip J1; the power conversion circuit includes a voltage regulator power chip U2, filter capacitors respectively connecting the first power input terminal and the second power input terminal of the voltage regulator power chip U2 to the electrode ground, and an electrolytic capacitor connecting the output terminal of the voltage regulator power chip U2 to the electrode ground.

[0035] Among them, the main control chip U1 uses a microcontroller MCU, and the main control chip U1 conducts control and feedback with other circuits. The main control chip U1 can control the motor drive through SPI communication interaction, and then control the motor 123 to drive the electrode 121 to perform corresponding movements. The movement of the motor 123 controls the heating degree of the coil 120, samples the temperature of the coil 120, and when the temperature of the coil 120 measured by the sampling is within the preset appropriate range, the main control chip U1 controls the output of a certain voltage to be provided to the coil 120 to maintain the normal working state of the coil 120. The voltage sampling and current sampling of the coil 120 are enabled, and the sampled data is fed back to the main control chip U1, and then the resistance value of the coil 120 is calculated. Then, the obtained resistance value is compared with the set standard threshold, and then the movement or emergency stop of the motor 123 is controlled. The debugging circuit is connected to the main control chip U1. When the clock is normal, the debugging circuit can access the main control chip U1 through the Debug interface to download programs for debugging. The power conversion circuit is used to provide 3.3V voltage to the main control chip U1 to ensure the normal operation of the main control chip U1.

[0036] As an optional specific example, the main control chip U1 uses a 32-bit ARM microcontroller of model STM32F103RxT6. Pin 15 of the main control chip U1 is used to feedback the status of the switching power supply to ensure that the switching power supply maintains a continuous output state. Pins 20, 21, 22, and 23 are four-way SPI communication interfaces for interacting with the motor. Pins 41, 42, 43, and 44 are respectively connected to four-way status lights, and the status of whether there is a fault is reflected through LED1~4. Pin 45 outputs the power supply status. Pins 46, 49, and 50 are the signal inputs from the debugging circuit to the main control chip U1, and pins 55 and 56 output signals to be connected to the debugging circuit. Pins 26, 27, 61, and 62 indirectly control the start / stop, forward rotation, reverse rotation, and acceleration of the motor by keys respectively, and feedback the commands output by the keys to the main control chip U1, and then control the motor to perform corresponding movements. Pins 58 and 59 are a way of I2C communication interface, which is connected to the voltage sampling circuit 23, and the voltage value is read through I2C. Pins 29 and 30 are another way of I2C communication interface, which is connected to the temperature sampling circuit 24 to transmit temperature signals. Pins 35 and 36 are the inputs of fault signals, which are used to control the function of pin 34 to output and control how the stepper motor works. If in a fault state, the motor drive is made to achieve an emergency stop; under normal circumstances, the motor is normally driven to rotate forward and backward. Pins 32, 48, 64, and 19 represent the internal working voltage of the device. Pins 12, 31, 47, 18, and 63 represent the ground terminal voltage. Pin 13 is the positive input of the analog signal. Pin 8 is the feedback input terminal of the voltage sampling signal of the coil. Pin 9 is the feedback input terminal of the current sampling signal of the coil. Pin 10 is the feedback input terminal of the temperature sampling signal. Pin 11 is the situation where once an abnormality occurs in the sampling circuits of coil temperature sampling, voltage sampling, and current sampling, it feedbacks to the main control chip and controls the motor to stop immediately. Pin 24 inputs the signal of abnormal current state. Pin 25 is the signal input terminal of abnormal temperature state. Pins 25, 37, 39, 40, 51, 52, and 53 are all pins related to power supply feedback. Among them, pin 25 inputs the power management clock signal and outputs the power management data signal through pin 37. Pin 39 inputs the signal of abnormal fan state. Pins 40, 51, 52, and 53 all input the signal of whether the power supply status is good. Pin 34 is used to implement the function of controlling the operation of the stepper motor. Pin 34 is connected to the N-channel transistor Q1, resistors R18 and R19. The gate of the transistor Q1 is connected to pin 34 of the main control chip, the drain is connected to the 5V power supply, the source is connected to a signal motor drive circuit and a resistor R19 is connected to the electrode ground, and a resistor R18 is connected between the gate and the source. When the transistor Q1 is in the on state, that is, when the gate voltage of the transistor Q1 is more than 10V greater than the drain voltage, the gate can accurately output a drive signal to control the motor to stop urgently; when the transistor Q1 is in the off state, no signal is output to the motor drive circuit.

[0037] The debugging circuit includes a JTAG interface chip J1, resistors R3 to R10, capacitors C13, C14, and Schottky diodes U3, U4. The debugging circuit is used to download programs inside the main control chip U1. Pin 1 and pin 2 of the JTAG interface chip J1 are connected to the 3.3V power supply, and are respectively connected to the electrode ground in series with capacitors C13 and C14. Pin 3 is the test reset terminal, which is connected in series with a resistor R5, and the output signal is connected to pins 5 and 6 of the main control chip for debugging. Pin 5 is the test data serial input terminal, which is connected in series with a resistor R6, and the output signal is connected to pin 50 of the main control chip for debugging. Pin 7 is the test mode selection terminal, which is connected in series with a resistor R7, and the output signal is connected to pin 46 of the main control chip for debugging. Pin 9 is the test clock terminal, which is connected in series with a resistor R8, and the output signal is connected to pin 49 of the main control chip for debugging. Pin 13 is the test data serial output terminal, which is connected in series with a resistor R9, and the output signal is connected to pin 55 of the main control chip for debugging. Pin 15 is the reset signal terminal, which is connected in series with a resistor R10, and the output signal is connected to pin 7 of the main control chip for resetting. Pin 11 is the test clock return signal terminal, pin 17 is connected to the ground in series with a resistor R3, and pin 19 is connected to the ground in series with a resistor R4. Among them, pins 3, 5, 7, 9, 13, and 15 pass through diodes U3 and U4, that is, each is connected in series with a diode to the ground. Among them, resistors R3 to R10 and Schottky diodes U3, U4 play a role in preventing backflow current, and filtering capacitors C13, C14 play a filtering role.

[0038] The power conversion circuit is used to convert the 5V voltage to 3.3V voltage, and includes a voltage regulator power chip U2, capacitors C5, C6, and electrolytic capacitor E4. The voltage regulator power chip U2 uses a power chip with the model LM3940IMP-3.3. Among them, the role of the power conversion circuit is to supply power to the main control chip U1. Pin 1 of the voltage regulator power chip U2 is connected to the 5V power supply voltage, pin 3 is connected to 3.3V, pins 2 and 4 are connected to the electrode ground. A filtering capacitor C5 is connected between the 5V power supply voltage and the ground, and a filtering capacitor C6 is connected between 3.3V and the ground. Among them, filtering capacitors C5, C6 play a filtering role, and an electrolytic capacitor E4 is connected between the output terminal and the electrode ground. The electrolytic capacitor E4 plays a filtering and energy storage role.

[0039] In some embodiments, the control circuit further includes a voltage control circuit 22 connected between the controller 20 and the coil 120. When the current temperature detected by the controller 20 falls within a preset temperature range, the controller 20 controls the voltage control circuit 22 to output a specified voltage value to the coil 120. The preset temperature range is pre-set according to the temperature range required for the normal operation of the coil. When the current temperature of the coil 120 is detected to be within the preset temperature range, the controller 20 controls the voltage control circuit 22 to output a specified voltage value to the coil 120 to heat the coil 120 and convert the liquid into vapor. When the current temperature exceeds the preset temperature range, the controller 20 controls the voltage control circuit 22 to stop supplying electrical energy to the coil 120. Optionally, please refer to Figure 7 , the voltage control circuit 22 includes an opto-isolation circuit 221, a MOS switch circuit 222, a MOS drive circuit 223 connected between the opto-isolation circuit 221 and the MOS switch circuit 222, and a boost circuit 224 connected between the opto-isolation circuit 221 and the controller 20. The boost circuit 224 converts the output voltage of the controller 20 into the operating voltage of the opto-isolation circuit 221. The opto-isolation circuit 221 isolates the power input part and the drive part in the control circuit. The MOS drive circuit 222 drives the MOS transistor in the MOS switch circuit 223 to conduct or cut off, so as to adjust the voltage control circuit 22 to output a specified voltage value to the coil 120.

[0040] Among them, the boost circuit 224 includes a boost chip U9, a first capacitor C30 connecting the positive input terminal Vin+ of the boost chip U9 to the electrode ground GND, a second capacitor C26 connecting the positive input terminal Vin+ and the positive output terminal Vout+, a third capacitor C27 connecting the negative input terminal Vin- and the negative output terminal Vout-, a fourth capacitor C29 connecting the positive output terminal Vout+ and the negative output terminal Vout-, a fifth capacitor C31 connecting the input power supply to the electrode ground, and a sixth capacitor C28 connecting the output power supply to the electrode terminal. The first capacitor C30, the fifth capacitor C31, and the sixth capacitor C28 are used for filtering. The second capacitor C26 and the third capacitor C27 are used to prevent differential mode interference. The fourth capacitor C29 is used to prevent high-frequency interference. The optocoupler isolation circuit 221 includes an optocoupler isolation chip U7, a field-effect transistor Q4 whose drain is connected to the load negative terminal of the optocoupler isolation chip U7, a voltage-dividing resistor R21 connecting the gate and the source of the field-effect transistor Q4, a clamping resistor R20 connecting the load positive terminal of the optocoupler isolation chip U7 to the boost circuit 224, and an isolation capacitor C23 connecting the power input terminal of the optocoupler isolation chip U7 to the isolation ground IS0_GND. The output terminal of the optocoupler isolation chip U7 is connected to the MOS drive circuit 222. The isolation capacitor C23 functions as a filter. When the voltage difference between the gate and the source of the field-effect transistor Q4 exceeds a preset value, the field-effect transistor Q4 conducts. The voltage-dividing resistor R21 is used to reduce the voltage difference to improve the anti-interference ability of the field-effect transistor. The MOS drive circuit 222 includes a MOS drive chip U8. The MOS switch circuit 223 includes a first field-effect transistor Q2 and a second field-effect transistor Q3 respectively connected to the two signal output terminals of the MOS drive chip U8, a protection circuit respectively connected between the source and the drain of the first field-effect transistor Q2 and the second field-effect transistor Q3, a common-mode inductor L3 respectively connected to the sources of the first field-effect transistor Q2 and the second field-effect transistor Q3, and a resistor R90 connected between one of the signal output terminals and the electrode ground. The protection circuit includes protection capacitors C24 (C25) and current-limiting resistors R24 (R24) connected in series between the source and the drain, and diodes D6 (D7) connected in parallel with the protection resistors R24 (R25). The protection circuit prevents high-voltage damage when the first field-effect transistor Q2 and the second field-effect transistor Q3 are turned off. The common-mode inductor L3 functions to filter out common-mode voltage interference. The resistor R90 functions for voltage sampling.

[0041] As an optional specific example, the voltage control circuit 22 functions to regulate the voltage, mainly controlling the turn-on and turn-off of the voltage in the range of 10V to 30V provided by the outside with a small 5V voltage. The optocoupler isolation circuit 221 is used to isolate the control part and the drive part in the circuit, so that the control circuit part and the drive circuit part are isolated from each other without interference, avoiding that if the drive circuit burns out, it will not affect the damage of the control circuit. The optocoupler isolation circuit 221 includes an optocoupler isolation chip U7, resistors R20, R21, a transistor Q4, and a capacitor C23. The optocoupler isolation chip U7 uses an isolation chip with the model TLP715. The drain of the transistor Q4 is connected to pin 3 of the optocoupler isolation chip U7. A resistor R21 is connected between the gate and the source of the transistor Q4. Pin 1 of the optocoupler isolation chip U7 is connected to the 5V voltage in series with a resistor R20. Pin 6 of the optocoupler isolation chip U7 is connected to the isolation voltage 5V and a capacitor C23 is connected to the isolation ground. The optocoupler isolation chip U7, as an optocoupler isolator, functions to isolate the input signal and the output signal so that they will not be interfered with by each other. The resistor R20 is a clamping resistor and functions to clamp. The resistor R21 is such that when there is a voltage difference between the gate and the source reaching a certain degree, the transistor Q4 will conduct. The resistor R21 can reduce the voltage between the gate and the source to a certain extent and can increase the anti-interference ability of the transistor. The capacitor C23 functions to filter.

[0042] The MOS drive circuit 222 realizes the turn-on and turn-off of a large voltage (in the range of 10V to 30V) with a small voltage of 5V. Among them, the MOS drive circuit includes a MOS drive chip U8, pin headers J4 and J5, transistors Q2 and Q3, resistors R22 to R25, capacitors C24 and C25, and diodes D6 and D7. The MOS transistor drive chip U8 can use a dual high-voltage isolation MOS driver chip of model HT0440. When the logic inputs A and B are at logic high, the output terminals VOUTA and VOUTB of the MOS transistor drive chip U8 generate two independent DC isolation voltages and are respectively connected to the MOS switch circuit. The transistors in the MOS switch circuit are equivalent to relays and have the advantage of non-contact control. The first field-effect transistor Q2 controls the high end, and the second field-effect transistor Q3 controls the low end. When Q2 and Q3 are conducting, the circuit forms a path, and the external voltage outputs a voltage to heat the coil. When Q2 and Q3 are cut off, the circuit is disconnected, that is, the voltage output by the MOS transistor drive chip U8 controls the conduction and disconnection of the circuit composed of Q2 and Q3, playing a switching role. Pin 1 (A) and pin 8 (B) of the MOS transistor drive chip U8 are commonly connected to the output terminal pin 5 of the optocoupler isolation chip U7, and pin 2 (CLK) and pin 7 (GND) are commonly connected to the isolated ground. The output of the MOS transistor drive chip U8 is connected to the MOS switch circuit, which includes the first field-effect transistor Q2 and the second field-effect transistor Q3, resistors R22 to R25, diodes R24 and R25, and capacitors C24 and C25. The output VOUTA signal of the MOS transistor drive chip U8 is output through pins 3 and 4. Pin 4 (VOUTA+) of the MOS transistor drive chip U8 is connected in series with a resistor R22 to pin 1 of the first field-effect transistor Q2. Pin 4 of the first field-effect transistor Q2 is connected to one end of the capacitor C24. The capacitor C24 is connected to a resistor R24 and then to pins 2, 3, 5, 6, and 7 of the first field-effect transistor Q2. A diode D6 is connected in parallel with the resistor R24. The input end of the diode D6 is connected to pins 2, 3, 5, 6, and 7 of the first field-effect transistor Q2. The capacitor C24, resistor R24, and diode D6 form a protection circuit when the first field-effect transistor Q2 is conducting, playing a role in filtering and preventing coil backrush. Pin 3 (VOUTA-) of the MOS transistor drive chip U8, the pins 2 of the first field-effect transistor Q2, the output end of the resistor R24, and the input end of the diode D6 are connected to pin 1 of the common-mode inductor L3. The pin header J4 is connected across pins 3 and 4 of the common-mode inductor L3. The output VOUTB signal of the MOS transistor drive chip U8 is output through pins 5 and 6. Pin 5 (VOUTB+) of the MOS transistor drive chip U8 is connected in series with a resistor R23 to pin 1 of the second field-effect transistor Q3.Pin 4 of the second field effect transistor Q3 is connected to one end of capacitor C25 and pin 2 of the common mode inductor L3. Capacitor C25 is connected to a resistor R25 which is then connected to pins 2, 3, 5, 6, 7 of the second field effect transistor Q3. A diode D7 is connected in parallel with resistor R25. The input end of diode D7 is connected to pins 2, 3, 5, 6, 7 of the second field effect transistor Q3. The capacitor C25, resistor R25, and diode D7 form a protection circuit when the second field effect transistor Q3 is conducting, which plays a role in filtering and preventing coil backrush. Pin 6 (VOUTB-) of the MOS transistor driver chip U8 is connected to pin I1 of resistor R90, and then outputs the current (Current Measure) signal through the V1 pin to the voltage amplification circuit of the current sampling circuit. Pin V2 of resistor R90 is grounded, and pin I2 is grounded and connected to pin 2 of J5. The coil is connected to the pin header J4, and voltage data sampling is performed on both ends of the coil respectively. The sampling data number of pin 1 of the pin header J4 is Vn, and the sampling data number of pin 2 of the pin header J4 is Vp. Then the voltages at both ends of the coil are connected to the voltage reduction circuit of the voltage acquisition circuit. Among them, resistors R22 and R23 are current-limiting and voltage-limiting resistors, which play a role in preventing excessive current and voltage, and ensuring the normal operation of the transistors in the MOS switch circuit. The common mode inductor L3 plays a role in filtering out common mode voltage interference. Resistor R90 plays a role in voltage sampling. The pin header J5 provides an external power supply, that is, a voltage in the range of 10 - 30V.

[0043] The boost circuit 224 includes a boost chip U9 and capacitors C26 - 31. The boost circuit boosts the 3.3V voltage to 5V voltage for supplying power to the U7 chip, which is connected to pin 6 (VDD) of U7. The boost chip U9 can use a power chip with the model number R1S - 3.305, which plays an isolation role, making the input end and the output end not interfere with each other. Pin 2 (Vin+) of the boost chip U9 is input with a 3.3V voltage, and the input end is connected to a capacitor C30 which is then connected to ground. A capacitor C26 is connected between pin 2 and pin 5. A capacitor C28 is connected between the 3.3V voltage and ground. The negative input end of pin 1 of the boost chip U9 is connected to the electrode ground. A capacitor C27 is connected between pin 4 and pin 1. A capacitor C29 is connected between pin 4 (Vout-) and pin 5 (Vout+). Since there is a chopper circuit integrated in the boost chip U9, energy can be accumulated through the inductor, and the current will decrease under normal circumstances. A capacitor C31 is connected between the isolated 5V voltage and the isolated ground. Among them, capacitor C30 plays a filtering role, and capacitors C26 and C27 are safety capacitors, which prevent differential mode interference between 3.3V and 5V and protect personal safety. Capacitors C28 and C31 play a filtering role. Capacitor C29 plays a role in filtering out high-frequency interference.

[0044] In some embodiments, please refer to Figure 3 and Figure 8, the control circuit further includes a motor drive circuit 21 connected between the controller 20 and the motor 123. The controller 20 controls the forward or reverse rotation of the motor 123 through the motor drive circuit 21 according to the difference between the current resistance value and the target resistance value, so as to adjust the position of the electrode 121. The controller 20 controls the rotation direction and the number of rotation cycles of the motor 123 through the motor drive circuit 21 to accurately control the movement direction and the movement distance of the electrode 121. The coil 120 is connected to the circuit where it is located through the electrode 121. Therefore, by changing the contact between the electrode 121 and different positions of the coil 120, the effective length of the coil 120 connected to the circuit where it is located can be adjusted, and the impedance of the coil 120 connected to the circuit can be adjusted. Optionally, the motor drive circuit 21 includes a motor control chip U5 and a buck circuit 211 that provides power to the motor control chip U5. Two motor output terminals of the motor control chip U5 are respectively connected to the positive input terminal and the negative input terminal of the motor 123. The motor drive circuit 21 further includes a first diode D1 and a second diode D2 that connect the feedback terminal of the motor control chip U5 to the positive input terminal and the negative input terminal of the motor respectively, a plurality of isolation resistors that connect the input terminals of the first diode D1 and the second diode D2 to the electrode ground, a clamping resistor that connects the test mode terminal to the isolation resistor, a filtering resistor that is connected to the first power input terminal, and a plurality of storage capacitors and electrolytic capacitors that are connected in parallel between the second power input terminal and the electrode ground. The first diode D1 and the second diode D2 play a role in preventing the reverse impact current of the electrode, the clamping resistor plays a clamping role, the filtering resistor plays a role in eliminating the noise of the first power input terminal, the storage capacitor plays a role in filtering and energy storage, and the electrolytic capacitor plays a role in filtering. The buck circuit 211 includes a buck chip U6, a filtering inductor L2 connected to the output terminal of the buck chip U6, a diode D5 connected between one end of the filtering inductor L2 and the electrode ground, a first electrolytic capacitor E3 connected between the other end of the filtering inductor L2 and the electrode ground, a second electrolytic capacitor E2 and a filtering capacitor C61 connected between the input terminal of the buck chip U6 and the electrode ground. The diode provides a freewheeling circuit. The filtering inductor C61 and the first electrolytic capacitor E3 play a role in eliminating the burrs caused by the inductor discharge. The filtering capacitor C61 plays a filtering role, and the second electrolytic capacitor E2 plays a role in preventing the generation of interference clutter.

[0045] As an optional specific example, the motor drive circuit 21 includes a motor control chip U5, two-phase four-wire stepper motors J2 and J3, diodes D1 to D4, resistors R11 to 17, capacitors C16 to 22, C63, and electrolytic capacitor E1. The motor control chip U5 uses a high-voltage driver with the model number TMC2130. The 5V power supply voltage required by the motor control chip U5 is obtained from the 12V voltage through a buck circuit. The purpose of bucking is to ensure the normal use of the motor control chip U5 to prevent damage caused by excessive voltage. The pins of the main control chip connected to the motor drive circuit generate step and direction signals. The motor position is controlled by sending pulses on the step signal, and the direction is indicated on the direction signal. The motor control chip U5 provides a signal of a microstep counter and a sine table, converts the signal into coil current, and controls the position of the motor. Pin 1 is the clock input, and the internal or external clock is connected to the ground wire with a short wire. Pins 2, 3, 4, and 5 achieve communication and interaction with the motor control chip U5. The output signal of pin 20 is connected to pin 2 of TMC2130 to adjust the SPI input mode. The output signal of pin 21 of the main control chip is connected to pin 3 of the motor control chip U5 to adjust the input mode of the SPI serial clock. The output signal of pin 22 of the main control chip is connected to pin 4 of the motor control chip U5 for SPI data input. The feedback signal output from pin 5 of the motor control chip U5 is connected to pin 23 (master device data input) of the main control chip to output SPI-related data. Pin 8 (VCC_IO) provides a 5V power supply voltage for all digital pins. Pin 10 has a pull-up resistor mode selection input, and a resistor R13 is connected in series to the 5V power supply voltage. The resistor R13 is a pull-up resistor. When it is in the tied-high state, it can be used to control the SPI interface. Pin 11 is grounded. The unused pin is connected to the electrode ground to be compatible with future versions. A capacitor C15 is connected between the 5V power supply voltage and the ground. Pins 12 and 35 are grounded, and a resistor R12 is connected. The resistance value of the resistor R12 is 0 ohm. Pin 13 (motor coil B output) is connected to one end of a two-phase four-wire stepper motor J3. The detection resistor of coil b of pin 14 (BRB) is connected to a resistor R15. The resistance value of the resistor R15 is 0 ohm. The detection resistor needs to be placed near the pin of the ground wire. Pin 15 (OB2 motor coil B output 2) is connected to the other end of a two-phase four-wire stepper motor J3. Both ends of the stepper motor J3 are respectively connected in series to the input ends of diodes D3 and D4. Pin 16 (VS motor power supply voltage) is connected in series with a capacitor C16 to the ground. Pin 18 (DCEN_CFG4) is grounded. Grounding can select the mode of pin 10 for normal operation, that is, the no-speed automatic change with load (dcStep) mode. Pins 20 and 21 are both diagnostic output pins with an error reporting function. They transmit relevant fault information to the main control chip, and then the main control chip controls the motor to stop running through the input of pin 22. Pin 23 (AIN_IREF) is connected in series with a resistor R17 and a pull-up resistor R16.Pin 24 (GNDA) is grounded. A capacitor C22 is connected in series to ground at pin 25 (5VOUT). A capacitor C21 is connected in series to ground at pin 26 (VCC). A resistor R16 is connected between pins 25 and 26. A capacitor C20 is connected between pin 27 (CPO charge pump capacitor output) and pin 28 (CPI charge pump capacitor input). A capacitor C19 is connected in series at pin 29 (voltage of VCP) to pin 30. Pin 30 (5V regulator for analog power supply voltage) and pin 31 (VS) are connected to a 12V power supply voltage. Two capacitors C17, C18 and an electrolytic capacitor E1 are connected in parallel between the 12V power supply voltage and ground. Pin 31 (motor power supply voltage) is connected to ground to provide filtering capability. Pin 32 (OA2 motor wire A output 2) is connected to pin 2 of a two-phase four-wire stepper motor J2. Pin 34 (OA1 coil A output 1) is connected to pin 1 of the two-phase four-wire stepper motor J2. Pin 33 (BRA, sense resistor of coil A) is connected to two ports of the two-phase four-wire stepper motor J2 through the input ends of two parallel diodes D1 and D2, and finally placed at the ground terminal. Pin 35 (GNDP) is connected to the left input end of diode D1 in series with a resistor R15. Pin 36 (input of TST_MODE test mode) is connected to one end of resistor R15 in series with a resistor R11. Pin 37 (EP) is grounded and used as the ground pin GND of the digital circuit. The exposed die pad is connected to GND, providing as many vias as possible to transfer heat to GND. Among them, diodes D1, D2, D3, D4 function to prevent the backrush current of the motor, resistor R13 functions as a clamp, resistors R11, R12, R14, R15 have a resistance value of 0 ohms and function as isolation, resistor R16 functions to eliminate the noise of pin 25 (5VOUT pin), capacitors C15, C16, C20 function as filters, capacitors C17, C18, C19 function as filters and energy storage, and electrolytic capacitor E1 functions as a filter. The resistance value of C21 is 470 nF. The resistance value of R16 is 2.2 ohms, and the resistance value of capacitor C20 is 22 nF. Capacitors C17, C18, C19 are 100 nF.

[0046] Among them, the buck circuit 211 includes a buck chip U6, an inductor L2, a diode D5, electrolytic capacitors E2 and E3, and a capacitor C61. The buck circuit 211 is a BUCK buck circuit, which is used to step down the 12V voltage to 5V voltage. The buck chip U6 uses a power chip with the model number LM25965. The 12V power supply voltage is connected to pin 1 (voltage input terminal) of the buck chip U6, and a capacitor C61 is connected between the input terminal and the ground. Pin 3 (GND) is grounded, and an electrolytic capacitor E2 is connected between the 12V power supply voltage and the ground. Pin 5 (switch terminal) is grounded. Pin 2 (voltage output terminal) is connected to 5V in series with an inductor L2, and an electrolytic capacitor E3 is connected between the ground and 5V. The LC filter circuit composed of the inductor L2 and the capacitor E3 plays a role in improving the power quality and eliminating the spikes caused by the rapid rise of the voltage during the instantaneous discharge of the inductor. A diode D5 is connected between the ground and the output terminal, providing a freewheeling loop. Among them, the capacitor C61 plays a filtering role, the electrolytic capacitor E2 plays a role in preventing interference and noise from being generated in the circuit, and the diode D5 plays a freewheeling role.

[0047] In some embodiments, the control circuit further includes an ambient temperature detection circuit 29 connected to the controller 20. The ambient temperature detection circuit 29 detects the temperature value of the environment around the motor, and controls the motor 123 to stop when the temperature value is higher than the set value. The ambient temperature detection circuit 29 includes a temperature sensor. Please refer to Figure 9 , as an optional specific example, the temperature sensor uses a digital sensor chip U19 with the model number MCP9804T-E / MS. The digital sensor chip U19 communicates with the main control chip through I2C to detect the ambient temperature inside the handle, so as to prevent the ambient temperature inside the handle from being too high. Once the ambient temperature inside the handle is too high, a signal will be fed back to the main control chip, and then the motor will be controlled to stop moving. If the temperature meets the normal operating state, the motor will perform normal forward and reverse rotations. The signal output from pin 30 of the main control chip is sent to the serial data input terminal pin 2 of the digital sensor chip U19. Pin 1 of the digital sensor chip U19 and pin 29 of the serial clock terminal of the main control chip transmit data to each other. The digital sensor chip U19 is controlled to start or end by the signal sent by the main control chip. Pins 5, 6, 7, and 8 are connected to the 3.3V power supply voltage, pin 4 (common ground terminal) is grounded, and a capacitor C56 is connected between the 3.3V power supply and the ground. The capacitor C56 plays a filtering role.

[0048] In some embodiments, please refer to Figure 3 and Figures 10 to 11, the control circuit further includes a power supply feedback circuit 28 connected to the controller 20. The power supply feedback circuit 28 obtains the voltage value output from the feedback terminal of the controller 20 to determine whether the power supply is in a normal state. The power supply feedback circuit 28 detects the states of each power supply respectively and plays a warning role. Optionally, the power supply feedback circuit 28 includes an anti-static circuit connected to the feedback terminal. The anti-static circuit includes switch chips D9, D10, D11 respectively connected to the input terminal or output terminal of the controller 20, and pin headers J9, J10, J11, J12 connected between the corresponding input terminal, output terminal and the switch chips D9, D10, D11. The switch chips D9, D10, D11 are transient diode chips. Each switch chip includes an input terminal connected to the feedback terminal, a triode with the base connected to the power enable terminal of the controller, a pull-up resistor connecting the emitter of the triode to the power supply voltage, and a diode connecting the collector of the triode to the power supply voltage. The collector is connected to the electrode ground. The pull-up resistor plays a clamping role, and the diode plays an anti-static role.

[0049] As an optional specific example, the signals output after the electrostatic measures are taken on multiple signals of the power feedback circuit 28, in cooperation with the motor adjustment circuit, control the on or off of the voltage by cooperating with the conduction or cut-off of the connected transistor, thereby determining the corresponding movement of the motor. When there are interference signals and internal states occur, the voltage adjustment circuit does not output voltage, playing a protective role, feeding back the corresponding signals to the MCU, and then controlling the motor to stop moving. Under normal circumstances, it is fed back to the main control chip to control the normal supply of voltage by the voltage control circuit, and the motor also rotates forward and backward accordingly. The V_SETPOINT signal connected to the switch chip U1 feeds back whether the power supply voltage is normal. POWER_GOOD_1, POWER_GOOD_2, and POWER_GOOD_3 are the power status of each path, and signals such as the fan, temperature alarm, bus clock, and data are all for the purpose of giving an alarm to prevent damage to the device due to excessive temperature and send an alarm signal. The anti-static circuit includes the pin headers J9, J10, J11, and J12. The switch chip uses transient diode chips D9, D10, and D11 of model 824001, resistors R80 to R89, transistors Q9, Q10, and Q11, and diodes D12, D13, and D14. The signals input or output from the main control chip U1 are not directly connected to the ports of the switch chips D9, D10, and D11, but are connected through the pin headers J9, J10, J11, and J12. The pin headers J9, J10, J11, and J12 are used because the ports are prone to static electricity, playing the role of an interface to prevent static electricity and interference, and grounding the unused ports. The switch chips D9, D10, and D11 are TVS diode arrays used to isolate static electricity and will not interfere with the operation of the main control chip. Connect the PMBUS_CLK signal of the main control chip U1 to pin 6 of the switch chip D9, and the PMBUS_DATA signal to pin 4. Output the AC_FAIL signal from pin 1 of the switch chip D9 to pin 24 of the main control chip U1, and connect a clamping resistor R83 between them to 3.3V. The resistors R80 to R83 connected to the pin header J9 play the role of clamping the signal at a high level and also limiting the current. Pin 3 receives the FAN_FAIL signal output from pin 39 of the main control chip, pin 2 (GND) is grounded, and pin 5 (VCC) is connected to 3.3V. The output of pin 1 of the switch chip D10, POWER_GOOD_GLOBAL, is connected to pin 40 of the main control chip, the output of pin 3, TEMP_ALARM, is connected to pin 25 of the main control chip, pin 2 (GND) is grounded, and pin 5 (VCC) is connected to 3.3V. The output of pin 1 of the switch chip D11, POWER_GOOD_1, is connected to pin 53 of the main control chip, the output of pin 3, POWER_GOOD_2, is connected to pin 52 of the main control chip, the output of pin 6, POWER_GOOD_3, is connected to pin 51 of the main control chip, the input of pin 4 is the V_SETPOINT signal output from pin 15 of the main control chip, pin 2 (GND) is grounded, and pin 5 (VCC) is connected to 3.3V.Pin 2 of the pin header J10 is connected to a resistor R85 by the POWER_GOOD_1 signal output from pin 1 of the switch chip D11. Pin 6 of the pin header J10 is connected to the V_SETPOINT signal output from pin 15 of the main control chip. The POWER_MOD_ENABLE signal output from pin 45 of the main control chip is input to pin 1 of the triode Q9. Pin 3 of the triode Q9 is connected to a pull-up resistor R84 to 5V to provide a high potential, and a diode D12-1 is connected from the output terminal of pin 3 of the triode Q9 to the 5V power supply. Pin 2 of the triode Q9 is grounded and is also connected to a diode D12-2 through D12-1 to the 5V power supply. Among them, the two diodes in the diode D12 play an anti-static role. The resistors R84 and R85 play a clamping role. Pin 2 of the pin header J11 is connected to a resistor R87 by the POWER_GOOD_2 signal output from pin 3 of the switch chip D11. Pin 6 of the pin header J11 is connected to the V_SETPOINT signal output from pin 15 of the main control chip. The POWER_MOD_ENABLE signal output from pin 45 of the main control chip is input to pin 1 of the triode Q10. Pin 3 of the triode Q10 is connected to a pull-up resistor R86 to 5V to provide a high level, and a diode D13-1 is connected from the output terminal of pin 3 of the triode Q10 to the 5V power supply. Pin 2 of the triode Q10 is grounded and is also connected to a diode D13-2 through D13-1 to the 5V power supply. Among them, the two diodes in the diode D13 play an anti-static role, and the resistors R86 and R87 play a clamping role. Pin 2 of the pin header J12 is connected to a signal output from pin 6 of the switch chip D11 and is connected to a pull-up resistor R89. Pin 6 of the pin header J12 is connected to the V_SETPOINT signal output from pin 15 of the main control chip. The POWER_MOD_ENABLE signal output from pin 45 of the main control chip is input to pin 1 of the triode Q11. Pin 3 of the triode Q11 is connected to a pull-up resistor R88 to the 5V power supply to provide a high level, and a diode D14-1 is connected from the output of pin 3 of the triode Q11 to the 5V power supply. Pin 2 of the triode Q11 is grounded and is also connected to a diode D14-2 through D14-1 to the 5V power supply. Among them, the two diodes in the diode D14 play an anti-static role, and the resistors R88 and R89 play a clamping role.

[0050] In some embodiments, the control circuit further includes an indication circuit, and the indication circuit indicates the working state of the controller by a lit or extinguished state, or by different lit states.

[0051] In some embodiments, please refer to Figure 3 and Figure 12, the control circuit further includes a key control circuit 26. After receiving a manual key instruction, the key control circuit 26 controls the motor 123 to rotate forward, rotate backward or stop according to the manual key instruction. The key control circuit 26 is used for manually controlling the operation of the motor 123, manually debugging data and performing tests before normal operation. When a key is pressed, a corresponding key control indication is given. For example, the key control circuit 26 includes four circuits, which respectively implement the four functions of starting and stopping, forward rotation, reverse rotation, and acceleration, and feed back the issued instruction to the main control chip U1, facilitating it to control the motor to make a drive to implement the corresponding function, and facilitating the obtaining of relevant test data. Optionally, the key control circuit 26 includes four keys SW1 to 4 respectively connected to the control signal terminals Switch1 to 4 of the controller 20, and a switch circuit respectively connected to the keys SW1 to 4. Taking SW1 as an example, each of the switch circuits includes a field effect transistor Q5 whose gate is connected to the corresponding key, a first voltage dividing resistor R72 connected between the gate and the source of the field effect transistor Q5, a second voltage dividing resistor R73 connecting the drain to the power supply voltage 3.3V, a third voltage dividing resistor R68 connecting the corresponding key SW1 to the power supply voltage, and a filter capacitor C57 connected in parallel with the third voltage dividing resistor R68. The keys SW1 to 4 respectively control the starting and stopping, forward rotation, reverse rotation and acceleration of the motor 123. When the keys SW1 to 4 are disconnected, the field effect transistors of the corresponding switch circuits of the keys SW1 to 4 are in the cut-off state. When the keys SW1 to 4 are pressed, the field effect transistors of the corresponding switch circuits of the keys SW1 to 4 are in the conducting state, and send corresponding manual key instructions to the control signal terminals of the controller 20.

[0052] As an optional specific example, the key control circuit 26 includes N-channel transistors Q5 to Q8, keys SW1 to 4, LEDs 5 to 8, resistors R68 to 79, and capacitors C57 to 60. The information states of the four functions of start / stop, forward rotation, reverse rotation, and acceleration are respectively fed back to pins 26, 27, 61, and 62 of the main control chip U1 through the four keys SW1, SW2, SW3, and SW4, and then the main control chip U1 outputs control signals from each pin to control the movement of the motor, that is, the four keys SW1, SW2, SW3, and SW4 indirectly control the motor 123. Taking the key SW1 as an example, the gate of the transistor Q5 is connected to the key SW1, an LED, and a resistor R68 to the 3.3V power supply voltage. There is a resistor R76 between the gate and the source of the transistor Q5. The drain of the transistor Q5 is connected in series with a resistor R77 to 3.3V, and there is also a capacitor C59 in parallel with the resistor R70. The source of the transistor Q5 is connected to the ground. The signal output from the drain of the transistor Q5 is fed back to the corresponding input / output port of the main control chip. When the key SW1 is pressed, that is, when the circuit is turned on, the transistor Q5 is in the on state, and the LED5 lights up, sending a command signal to the main control chip. When the key SW1 is released, that is, when the branch is disconnected, the transistor Q5 is in the off state, and the circuit is not conducting, and no signal is sent to the main control chip U1. The circuits composed of the transistors Q6, Q7, and Q8 are the same. Among them, the resistor R68 plays a role in current limiting. The resistor R72 plays a role in voltage division, that is, dividing the gate voltage. The capacitor C59 plays a role in filtering.

[0053] In some embodiments, please refer to Figure 3 and Figure 13 , the voltage sampling circuit 23 includes a voltage reduction circuit 231, an optical isolation circuit 232, and a follower circuit 233. The voltage reduction circuit 231 includes a first comparator U13A, a first sampling resistor R28 and a second sampling resistor R29 respectively connected between the positive and negative input terminals of the first comparator U13A and the positive and negative voltage terminals of the coil 123, an isolation resistor R26 connected between the positive input terminal and the isolated ground ISO_GND, and a first feedback resistor R27 connected between the negative input terminal and the output terminal; the first sampling resistor R28 and the second sampling resistor R29 play a role in current limiting; the optical isolation circuit 232 includes an optical isolation voltage sensor U10 connected to the output terminal of the first comparator U13A; the follower circuit 233 includes a second comparator U12A whose positive and negative input terminals are respectively connected to the positive and negative output terminals of the optical isolation voltage sensor U10, and a protection resistor R44 connected between the output terminal of the second comparator U12A and the induced voltage output terminal, and the protection resistor R44 plays a role in preventing output short-circuit failure.

[0054] As an optional specific example, the voltage sampling circuit 23 is used to accurately sample the voltage value of the coil voltage and feedback it to the main control chip U1 as the VOLTAGE_SENSOR signal. The entire signal is input to pins 2 and 3 of the first comparator U13A by the sampled Vn and Vp signals respectively to achieve the function of voltage reduction, reducing the voltage value of the voltage signal. The output signal is connected to the input terminal of pin 2 of the optical isolation voltage sensor U10 for isolation processing. The signal obtained from the isolation circuit is connected to the follower circuit, and the voltage output across pins 6 and 7 is connected to the follower circuit composed of the second comparator U12A. Finally, the VOLTAGE_SENSOR signal is output from pin 1 and feedback to the main control chip U1, which can accurately feedback the voltage sampling value to the main control chip. The main control chip can calculate the corresponding voltage value. The first comparator U13A uses a comparator of model OPA2237EA. The circuit composed of the first comparator U13A and resistors R26 to 29 realizes the function of voltage reduction, reducing the voltage by 0.056 times. The positive voltage Vp of the sampled coil is input and connected to a resistor R28 and then to pin 3 of the first comparator U13A. The negative voltage Vn of the sampled coil is input and connected to a resistor R29 and then to pin 2 of the first comparator U13A. A resistor R26 is connected between the non-inverting input terminal and the isolated ground. A feedback resistor R27 is connected between the inverting input terminal and the output terminal. Pin 4 of the first comparator U13A is connected to the isolated ground, and pin 8 is connected to the isolated voltage of 5V. The optical isolation voltage sensor U10 uses a chip of model ACPL-C87B. The optical isolation voltage sensor U10, resistors R32, R34, and capacitors C32, C33, C36 to 38 form an optical isolation circuit. Pin 1 of the optical isolation voltage sensor U10 is connected to the isolated power supply voltage of 5V, and a capacitor C32 is connected to the isolated ground. The voltage passing through R32 is connected to pin 3 (SHDN shutdown pin) of the optical isolation voltage sensor U10, and this pin functions when at a high potential. Pin 3 is connected to one end of a resistor R34, the other end of the resistor R34 is connected to the isolated ground, and a capacitor C33 is connected to the output terminal of the resistor R32. Pin 4 of the optical isolation voltage sensor U10 is connected to the isolated ground, pin 5 of U10 is grounded, and a capacitor C38 is connected to 3.3V. Pin 8 (power supply voltage of the output terminal) is connected to the 3.3V power supply voltage, and a capacitor C37 is connected to the ground. A capacitor C36 is connected between pin 6 (negative voltage output) and pin 7 (positive voltage output).The second comparator U12A uses a chip of model OPA2237. The second comparator U12A, resistors R36 to R39, and protection resistor R44 form a follower circuit. Pin 7 (positive voltage output) of the optical isolation voltage sensor U10 is connected in series with a resistor R36 to pin 3 (non-inverting input terminal) of the second comparator U12A. Pin 6 (negative voltage output) of the optical isolation voltage sensor U10 is connected in series with a resistor R37 to pin 2 (inverting input terminal) of U12A. Pin 4 of U12A is grounded, and pin 8 is connected to 3.3V. One end of resistor R38 is connected to pin 3 (non-inverting input terminal) and the other end is connected to ground. One end of resistor R39 is connected to pin 2 (inverting input terminal) and the other end is connected to the output terminal. The output terminal is connected in series with a resistor R45, and finally a voltage sampling value Voltage_SENSOR is output. Among them, the resistance values of R26 to R29 determine the reduction multiple achieved by the voltage reduction circuit. The reduction multiple is calculated by the formula u = |-Rf / R1| = |-R27 / R29| = |-5K / 88.7K| = 0.056, indicating that the voltage is reduced by 0.056 times. By the formula u = |-Rf / R1| = |-R39 / R37| = |-10K / 10K| = 1, it can be known that the amplification factor of the follower is 1. R28 and R29 play a role in current limiting. Capacitors C32, C37, and C38 play a role in filtering, and resistor R44 plays a role in preventing output short-circuit failure.

[0055] In some embodiments, please refer to Figure 3 and Figure 14 , the current sampling circuit 25 includes an amplified voltage circuit 251, an optical isolation circuit 252, and a follower circuit 253. The amplified voltage circuit 251 includes a third comparator U13B with its positive input terminal connected to the current signal output terminal, a current limiting resistor R30 connecting the negative input terminal of the third comparator U13B to the isolated ground ISO_GND, and a second feedback resistor R31 connected between the negative input terminal and the output terminal; the current limiting resistor R30 plays a role in current limiting; the optical isolation circuit 252 includes an optical isolation voltage sensor U11 connected to the output terminal of the third comparator U13B; the follower circuit 253 includes a fourth comparator U12B with its positive and negative input terminals respectively connected to the positive and negative output terminals of the optical isolation voltage sensor U11, a protection capacitor C40 connected between the positive and negative input terminals of the fourth comparator U12B, and a protection resistor R45 connected between the output terminal of the fourth comparator U12B and the induced current output terminal. The protection capacitor C40 plays a role in avoiding interference from high-frequency AC signals and DC pulse signals, and the protection resistor R45 plays a role in preventing output short-circuit failure.

[0056] As an optional specific example, the current sampling circuit is used to accurately sample the current value of the coil current and feedback it to the main control chip as the CURRENT_SENSOR signal. The entire signal is input from the current signal output by the resistor R90 to pin 5 of the third comparator U13B to achieve the voltage amplification function, amplify the voltage value of the current signal, connect the output signal to the input terminal of pin 2 of the optical isolation voltage sensor U11 for isolation processing, connect the signal obtained from the isolation circuit to the follower circuit, output the voltage through both ends of pins 6 and 7 to form a follower circuit composed of the third comparator U12B, and finally output the CURRENT_SENSOR signal from pin 7 and feedback it to the main control chip U1, which can accurately feedback the current sampling value to the main control chip. The main control chip can calculate the corresponding current value. The third comparator U13B uses the comparator of model OPA2237EA. The circuit composed of the third comparator U13B, resistors R30 and R31 realizes the function of amplifying the voltage, amplifying the voltage by 32.6 times. The output current signal of the resistor R90 is input to pin 5 of the third comparator U13B. A resistor R33 is connected in series to pin 7 of the third comparator U13B and connected to pin 2 (VIN input voltage signal) of the optical isolation voltage sensor U11. Pin 6 of the third comparator U13B is connected to an isolation ground through a resistor R30. Pin 4 of the third comparator U13B is connected to the isolation ground. Pin 8 of the third comparator U13B is connected to the isolation voltage of 5V. The negative feedback resistor R31 is connected to the inverting input terminal of the third comparator U13B through the amplification circuit of the third comparator U13B. The optical isolation voltage sensor U11 uses the chip of model ACPL-C87B. The optical isolation voltage sensor U11, resistors R33 and R35, and capacitors C34, C35, C39 to 41 form an optical isolation circuit. Pin 1 of the optical isolation voltage sensor U11 is connected to the isolation power supply voltage of 5V, and a capacitor C34 is connected to the isolation ground. The voltage passing through the resistor R33 is connected to pin 3 (SHDN shutdown pin) of the optical isolation voltage sensor U11, and this pin works when at a high potential. One end of the resistor R35 is connected to pin 3, the other end of the resistor R35 is connected to the isolation ground, and a capacitor C35 is connected to the output terminal of the resistor R33. Pin 4 of the optical isolation voltage sensor U11 is connected to the isolation ground. Pin 5 of the optical isolation voltage sensor U11 is grounded and a capacitor C41 is connected to 3.3V. Pin 8 (power supply voltage of the output terminal) is connected to the 3.3V power supply voltage, and a capacitor C39 is connected to the ground. A capacitor C40 is connected between pin 6 (negative voltage output) and pin 7 (positive voltage output). The follower circuit includes the OPA2237 chip U12B, resistors R40 to 43, and R45.The pin 7 (positive voltage output) of the optical isolation voltage sensor U11 is connected in series with a resistor R40 to the pin 5 (non-inverting input terminal) of U12B. The pin 6 (negative voltage output) of the optical isolation voltage sensor U11 is connected in series with a resistor R41 to the pin 6 (inverting input terminal) of U12B. The pin 4 of the fourth comparator U12B is grounded, and the pin 8 is connected to 3.3V. One end of the resistor R42 is connected to the pin 5 (non-inverting input terminal), and the other end is connected to the ground. One end of the resistor R43 is connected to the pin 6 (inverting input terminal), and the other end is connected to the output terminal. The output terminal is connected in series with a resistor R45, and finally a current sampling value CURRENT_SENSOR is output. Among them, the amplification factor of the amplifier circuit is determined by the resistance values of the resistors R30 and R31. The amplification factor is calculated by the formula u = 1 + Rf / R1 = 1 + R31 / R30 = 1 + 1K / 31.6K = 32.6, so it can be seen that the voltage is amplified 32.6 times. By the formula u = |-Rf / R1| = |-R43 / R41| = |-10K / 10K| = 1, it can be known that the amplification factor of the follower is 1. The resistor R30 plays a role in current limiting, the capacitors C34, C39, and C41 play a role in filtering, the capacitor C40 plays a role in avoiding the interference of high-frequency AC signals and DC pulse interference signals, and the resistor R45 plays a role in preventing output short-circuit failure.

[0057] The values sampled by the voltage and current sampling circuits are fed back to the main control chip and the corresponding voltage and current values are calculated. Through calculation, the resistance value of the connected coil can be obtained, and the requirement of stabilizing the resistance value of the connected coil can be achieved.

[0058] In some embodiments, please refer to Figure 3 、 Figures 15 to 16, the temperature sampling circuit 24 includes a temperature processing circuit and a voltage amplification circuit. The temperature processing circuit includes a first temperature sampling circuit 241 for sampling the temperature of the steam outlet of the coil 120 and a second temperature sampling circuit 242 for sampling the temperature of the coil. The first temperature sampling circuit 241 includes a temperature sensor chip U16 and a thermocouple J6 connected to the positive and negative input terminals of the sensor chip U16. The thermocouple J6 is disposed at the air jet of the coil 120. The voltage amplification circuit includes a fifth comparator U15 with its positive input terminal connected to the output terminal of the sensor chip U16, a first voltage dividing resistor R58 connecting the negative input terminal of the fifth comparator U15 to the electrode ground, and a second voltage dividing resistor R59 connected between the first voltage dividing resistor R58 and the output terminal of the fifth comparator U15. The amplification ratio of the voltage amplification circuit is determined by the first voltage dividing resistor R58 and the second voltage dividing resistor R59. The second temperature sampling circuit 242 includes a temperature signal conversion circuit, a signal interaction isolation circuit, and an isolation circuit. The temperature signal conversion circuit includes a thermocouple J7 disposed on the coil 120 and a temperature sensor U14A with its positive and negative input terminals connected to the thermocouple J7. The signal interaction isolation circuit includes an isolation chip U18 communicatively connected to the temperature sensor U14A. The output terminal of the isolation chip U18 is connected to the controller 20. The isolation circuit includes an isolated DC-DC converter U17. The negative output terminal of the isolated DC-DC converter U17 is connected to the ground terminal of the temperature sensor U14A, and the positive input terminal is connected to the power input terminal of the temperature sensor U14A.

[0059] As an optional specific example, the first temperature sampling circuit 241 of the steam outlet accurately samples the voltage value of the temperature of the steam outlet of the coil and feeds it back to the main control chip as a TEMP_SENSOR signal. The temperature value of the steam outlet measured by the thermocouple J6 by the first temperature sampling circuit 241 first undergoes the filtering effect of the RC filtering circuit and then is input through pins 1 and 8 of the input terminal of the sensor chip U16. The sensor chip U16, as a high-precision temperature processor, obtains a high-precision temperature voltage value. The signal output from pin 6 of the sensor chip U16 is connected to the non-inverting input terminal of pin 3 of the fifth comparator U15. Through the voltage amplification circuit, the voltage value of the accurate temperature is amplified 1.59 times to the main control chip for convenient reading of the value. Finally, the TEMP_SENSOR signal is fed back to the main control chip from pin 1, and the temperature sampling value can be accurately fed back to the main control chip. The corresponding temperature value can be calculated by the main control chip. The sensor chip U16 uses a chip of model AD8495ARMZ. The sensor chip U16, resistors R49, R50, R53, and capacitors C42, C44, C45, 48 form a high-precision temperature sensing circuit. The thermocouple J6 is a thermocouple for the temperature of the air jet port connected to the coil. The sensor chip U16 uses a high-precision temperature sensor of model AD8495ARMZ. Since the voltage flowing through the circuit is very small, high-precision processing is required to output a high-precision temperature voltage value. The output terminal of pin 1 of the thermocouple J6 is connected in series with a resistor R49 and connected to pin 8 (IN+) of the sensor chip U16. The output terminal of pin 2 of the thermocouple J6 is connected in series with a resistor R50 and connected to pin 1 (IN-) of U16. Among them, the resistor R49 and the capacitor C44, and the resistor R50 and the capacitor C45 constitute an RC filtering circuit to filter out the high-frequency interference in the circuit. Pin 2 of the sensor chip U16 must be driven by a low impedance to function. Pin 3 (VS-) is grounded. Pin 5 (SENSE) uses its test mode and needs to be connected to the output, that is, connected to pin 3 (non-inverting input terminal) of the fifth comparator U15. Pin 7 (positive power supply) is connected to 3.3V, and a capacitor C48 is connected between the power supply voltage 3.3V and the ground. The fifth comparator U15 uses a chip of model AD8603AUI. The fifth comparator U15, resistors R58, R59, and capacitor C49 form a voltage amplification circuit. The fifth comparator U15 is a MOS tube operational amplifier, and the formed circuit plays a role in voltage amplification. Pin 6 (OUT) outputs to the non-inverting input terminal of pin 3 of the fifth comparator U15. Pin 2 (GND) of the fifth comparator U15 is grounded. Pin 5 (power supply terminal) is connected to 3.3V, and a capacitor C49 is connected between the ground and the 3.3V power supply. Pin 4 (negative input terminal) is connected to a resistor R58 grounded and also connected to a resistor R59 to the output terminal. The temperature acquisition is performed at the output terminal of pin 1 of the fifth comparator U15. The relevant information between the input of the output terminal voltage and the temperature: has a non-inverting gain of 1.59.It is verified that at 25°C, Vout is 199 mV; at 200°C, Vout is 1590 mV; at 250°C, Vout is 1990 mV; at 300°C, Vout is 2340 mV; at 400°C, Vout is 3180 mV. Among them, the resistance values of resistors R58 and R59 determine the amplification ratio. Capacitors C48 and C49 play a filtering role.

[0060] The second temperature sampling circuit 242 for detecting the coil temperature takes isolation measures to prevent interference caused by potential imbalance and isolates the control part from the drive part. The thermocouple J7 is arranged at the coil, and the voltage signal of the temperature on the thermocouple J7 is output through both ends of pins 1 and 2. After the filtering effect of the RC filtering circuit, the electromotive force of the thermocouple J7 is connected to both ends of pin 2 (Vin+) and pin 4 (Vin-) of the temperature sensor U14A. The corresponding Celsius degrees obtained by converting the electromotive force are output through the temperature sensor U14A. The relevant Celsius degree signal conducts I2C communication interaction between pin 20 (SDA) and pin 19 (SCL) of the I2C bus of the temperature sensor U14A and pin 6 (SCL2) and pin 7 (SDA2) of the isolation chip U18. The obtained temperature value is isolated by the isolation chip U18, and the corresponding coil temperature value is output from pin 2 (SDA1) and pin 3 (SCL1) of the isolation chip U18 and fed back to pins 58 and 59 of the main control chip. The main control chip can facilitate subsequent operations such as turning on the voltage and current sampling circuits or emergency stopping the motor according to the obtained corresponding temperature value. Among them, the 3.3V voltage in the isolated state is obtained by isolating DC-DC conversion of the 3.3V voltage through the isolated DC-DC converter U17. It can isolate high-frequency interference, prevent high-voltage radiation generated by high voltage, prevent additional interference to other components, especially low-voltage components, and output a stable 3.3V voltage for use by the coil in the isolated state. The temperature sensor U14 uses a chip with the model MCP9600. The temperature sensor U14, the thermocouple J7, resistors R51, R52, R54 to 57, and capacitors C43, C46, C47 form a temperature signal conversion circuit. The thermocouple J7 is arranged on the coil, and the temperature sensor U14 functions to convert the electromotive force of the thermocouple J7 into Celsius degrees. The output end of pin 1 of the thermocouple J7 is connected in series with a resistor R51 to pin 2 of the temperature sensor U14A. The output end of the resistor R51 is connected to the resistor R55 to the 3.3V voltage of the temperature module and is also connected to the ground terminal of the temperature module through the resistor R56. The capacitor C46 is connected in parallel with the resistor R49. The resistor R51 and the capacitor C46 form an RC filtering circuit to filter out high-frequency interference. The output end of pin 2 of the thermocouple J7 is connected in series with a resistor R52 to pin 4 of the temperature sensor U14A and is also connected to a resistor R54 to the ground of the temperature module. The output end of the resistor R52 is connected to a capacitor C47 to the ground of the temperature module. The resistor R52 and the capacitor C47 form a filtering circuit to filter out high-frequency interference. A capacitor C43 is connected between pin 2 and pin 4 of the temperature sensor U14A. The signal output from pin 19 (SCL) of the temperature sensor U14A is connected to pin 6 (SCL2) of the isolation chip U18, and the output of pin 20 of the temperature sensor U14A is connected to pin 7 (SDA2) of the isolation chip U18. Pins 19 and 20 are respectively connected to a clamping resistor R60 and R61 and connected to the 3.3V of the temperature module.For the pins of another functional terminal U14B of the temperature sensor U14, except that pin 8 is connected to the 3.3V of the temperature module, the rest are all connected to the ground of the temperature module, and a capacitor C54 is connected between the 3.3V power supply and the ground of the temperature module. Among them, capacitor C43 plays a role in preventing differential-mode interference, and capacitors C50 and C54 play a filtering role. Resistors R60 and R61 play a clamping role.

[0061] The isolation chip U18 uses the model ISO1540DR. The isolation chip U18, resistors R60 to 63, and capacitors C50 and C51 form a signal interaction isolation circuit. The isolation chip U18 isolates the input temperature in degrees Celsius signal and outputs a stable I2C signal of the coil temperature after isolation, so that the input end and the output end do not interfere with each other, facilitating I2C data transmission and feedback transmission with the main control chip to obtain the temperature value. The I2C1_SCL output from pin 58 of the main control chip is connected to pin 2 (SDA1) of the isolation chip U18, and the input / output signal of pin 59 (I2C1_SDA) of the main control chip is connected to pin 3 (SCL1) of the isolation chip U18, and a clamping resistor R62 and R63 are respectively connected to pins 2 and 3 to ensure normal communication interaction between pins 2 and 3. Pin 1 (VCC1) of the isolation chip U18 is connected to the 3.3V power supply voltage, and a capacitor C51 is connected between the 3.3V power supply voltage and the ground. Pin 8 (VCC2) of the isolation chip U18 is connected to the 3.3V power supply voltage of the temperature module, and a capacitor C50 is connected between the ground and the 3.3V of the temperature module. Pin 4 of the isolation chip U18 is grounded, and pin 5 is connected to the ground of the temperature module. Among them, capacitors C50 and C51 play a filtering role. Resistors R62 and R63 play an anti-interference role for this pin when inputting signals.

[0062] The isolated DC-DC converter U17 uses the MEU1S0303ZC chip. The isolated DC-DC converter U17 and capacitors C52, C53, and C55 form an isolation circuit. The voltage values at the input and output ends of the isolated DC-DC converter U17 are the same, which plays a role in isolating high-frequency interference, preventing high-voltage radiation generated by high voltages, and preventing additional interference to other components, especially low-voltage components. Pin 1 (Vin+) of the isolated DC-DC converter U17 is input with the power supply voltage 3.3V, pin 2 (Vin-) is grounded, and a capacitor C52 is connected between the power supply voltage 3.3V and the ground. Pin 3 (Vout-) is connected to the ground of the temperature module, pin 4 (Vout+) is connected to the 3.3V of the temperature module, and a capacitor C53 is connected between the 3.3V of the temperature module and the ground of the temperature module. A capacitor C55 is connected between pins 3 and 4 of the isolated DC-DC converter U17. Among them, capacitors C52, C53, and C55 play a filtering role.

[0063] In the above embodiments, the sampling process of the voltage, current, and temperature of the coil preferably has a certain sequence. First, the temperature of the coil is sampled. When the measured coil temperature is within a preset standard threshold, the voltage control switch in the voltage control circuit is then turned on. Then, the voltage sampling and current sampling circuits start to work, output the sampled data and feedback it to the main control chip, calculate the impedance value of the effective length of the coil connected to the circuit, and then compare the obtained data with the set standard threshold. If the feedback value does not meet the set standard threshold, the main control chip will control the motor to make an emergency stop. If the feedback value meets the set standard threshold, the motor drive circuit is then controlled to perform normal forward and reverse rotations. Additionally, for voltage and current sampling, the voltage is first amplified / reduced, and then an isolation circuit and a follower circuit are connected, which can avoid interference from high-frequency AC signals and DC pulse interference signals to accurately output the measured value. And isolation measures are taken for the temperature sampling of the coil to prevent interference caused by the coil voltage.

[0064] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A steam generating device, characterized in that, It includes a coil with a hollow interior, an electrode electrically connected to the coil, a motor for driving the electrode to move so as to adjust the effective length of the coil connected to the circuit in which it is located, and a control circuit for controlling the operation of the motor, wherein the control circuit includes a controller and a sampling circuit connected between the controller and the coil, wherein the sampling circuit includes a temperature sampling circuit, a voltage sampling circuit and a current sampling circuit, and liquid is heated in the coil and converted into steam; The temperature sampling circuit collects the current temperature of the coil and sends it to the controller, and the controller determines the target resistance of the coil according to the current temperature and the corresponding relationship between the coil temperature and the change of the coil resistance; The voltage sampling circuit and the current sampling circuit respectively collect the current working voltage and the current working current of the coil and send them to the controller. The controller determines the current resistance of the coil according to the current working voltage and the current working current, controls the motor to rotate and drives the electrode to move to the target position according to the difference between the current resistance and the target resistance, and adjusts the effective length to correspond to the target resistance.

2. The steam generating device according to claim 1, characterized in that, The controller includes a main control chip, a debugging circuit and a power conversion circuit connected to the main control chip, the debugging circuit includes a JTAG interface chip, a plurality of resistors respectively connecting a test reset terminal, a test data serial input terminal, a test mode selection terminal, a test data serial output terminal, a test clock terminal, a reset signal terminal, and a test clock return signal terminal of the JTAG interface chip, a Schottky diode connecting the plurality of resistors to an electrode ground, and a filter capacitor connected to a power input terminal of the JTAG interface chip; The power conversion circuit includes a voltage-stabilized power chip, a filter capacitor connecting a first power input terminal and a second power input terminal of the voltage-stabilized power chip to an electrode ground respectively, and an electrolytic capacitor connecting an output terminal of the voltage-stabilized power chip to an electrode ground.

3. The steam generating device according to claim 1, characterized in that, The control circuit also includes a voltage control circuit connected between the controller and the coil. When the current temperature meets a preset temperature range, the controller controls the voltage control circuit to output a voltage value of a specified magnitude to the coil.

4. The steam generating device according to claim 3, characterized in that, The voltage control circuit includes an optocoupler isolation circuit, a MOS switch circuit, a MOS drive circuit connected between the optocoupler isolation circuit and the MOS switch circuit, and a boost circuit connected between the optocoupler isolation circuit and the controller. The boost circuit converts the output voltage of the controller into the working voltage of the optocoupler isolation circuit. The optocoupler isolation circuit isolates the power input part and the drive part. The MOS drive circuit drives the MOS tube in the MOS switch circuit to turn on or off, so as to adjust the voltage control circuit to output a voltage value of a specified size to the coil.

5. The steam generating device according to claim 4, characterized in that, The boost circuit includes a boost chip, a first capacitor connecting the positive input terminal of the boost chip to the electrode ground, a second capacitor connecting the positive input terminal and the positive output terminal, a third capacitor connecting the negative input terminal and the negative output terminal, a fourth capacitor connecting the positive output terminal and the negative output terminal, a fifth capacitor connecting the input power supply to the electrode ground, and a sixth capacitor connecting the output power supply to the electrode terminal. The first capacitor, the fifth capacitor, and the sixth capacitor are used for filtering. The second capacitor and the third capacitor are used to prevent differential-mode interference. The fourth capacitor is used to prevent high-frequency interference.

6. The steam generating device according to claim 4, characterized in that, The optocoupler isolation circuit includes an optocoupler isolation chip, a field-effect transistor with its drain connected to the load negative terminal of the optocoupler isolation chip, a voltage-dividing resistor connecting the gate and the source of the field-effect transistor, a clamping resistor connecting the load positive terminal of the optocoupler isolation chip to the boost circuit, and an isolation capacitor connecting the power input terminal of the optocoupler isolation chip to the isolation ground. The output terminal of the optocoupler isolation chip is connected to the MOS drive circuit. The isolation capacitor functions as a filter. When the voltage difference between the gate and the source of the field-effect transistor exceeds a preset value, the field-effect transistor conducts. The voltage-dividing resistor is used to reduce the voltage difference to enhance the anti-interference ability of the field-effect transistor.

7. The steam generating device according to claim 4, characterized in that, The MOS drive circuit includes a MOS drive chip. The MOS switch circuit includes a first field-effect transistor and a second field-effect transistor respectively connected to the two signal output terminals of the MOS drive chip, a protection circuit respectively connected between the source and the drain of the first field-effect transistor and the second field-effect transistor, a common-mode inductor respectively connected to the sources of the first field-effect transistor and the second field-effect transistor, and a resistor connected between one of the signal output terminals and the electrode ground. The protection circuit includes a protection capacitor and a current-limiting resistor connected in series between the source and the drain, and a diode connected in parallel with the protection resistor. The protection circuit prevents high-voltage damage when the first field-effect transistor and the second field-effect transistor are turned off. The common-mode inductor functions to filter out common-mode voltage interference. The resistor functions for voltage sampling.

8. The steam generating device according to claim 1, characterized in that, The control circuit further includes a motor drive circuit connected between the controller and the motor. The controller controls the motor to rotate forward or backward through the motor drive circuit according to the difference between the current resistance value and the target resistance value to adjust the position of the electrode.

9. The steam generating device according to claim 8, characterized in that, The motor drive circuit includes a motor control chip and a buck circuit for supplying power to the motor control chip. Two motor output terminals of the motor control chip are respectively connected to the positive input terminal and the negative input terminal of the motor. The motor drive circuit further includes a first diode and a second diode that connect the feedback terminal of the motor control chip to the positive input terminal and the negative input terminal of the motor respectively, a plurality of isolation resistors that connect the input terminals of the first diode and the second diode to the electrode ground, a clamping resistor that connects the test mode terminal to the isolation resistors, a filtering resistor connected to the first power input terminal, and a plurality of storage capacitors and electrolytic capacitors connected in parallel between the second power input terminal and the electrode ground. The first diode and the second diode function to prevent electrode backrush current, the clamping resistor functions to clamp, the filtering resistor functions to eliminate the noise at the first power input terminal, the storage capacitors function to filter and store energy, and the electrolytic capacitors function to filter.

10. The steam generating device according to claim 9, characterized in that, The buck circuit includes a buck chip, a filtering inductor connected to the output terminal of the buck chip, a diode connected between one end of the filtering inductor and the electrode ground, a first electrolytic capacitor connected between the other end of the filtering inductor and the electrode ground, a second electrolytic capacitor and a filtering capacitor connected between the input terminal of the buck chip and the electrode ground. The diode provides a freewheeling loop. The filtering inductor and the first electrolytic capacitor function to eliminate the spikes caused by inductor discharge. The filtering capacitor functions to filter, and the second electrolytic capacitor functions to prevent the generation of interference clutter.

11. The steam generating device according to claim 1, characterized in that, The control circuit further includes an ambient temperature detection circuit connected to the controller. The ambient temperature detection circuit detects the temperature value of the environment around the motor, and controls the motor to stop when the temperature value is higher than the set value.

12. The steam generating device according to claim 1, characterized in that, The control circuit further includes a power supply feedback circuit connected to the controller. The power supply feedback circuit obtains the voltage value output from the feedback terminal of the controller to determine whether the power supply is in a normal state.

13. The steam generating device according to claim 12, characterized in that, The power supply feedback circuit includes an anti-static circuit connected to the feedback terminal. The anti-static circuit includes a switch chip respectively connected to the input terminal or the output terminal of the controller, and pin headers connected between the corresponding input terminal, output terminal and the switch chip. The switch chip is a transient diode chip. Each switch chip includes an input terminal connected to the feedback terminal, a triode whose base is connected to the power enable terminal of the controller, a pull-up resistor connecting the emitter of the triode to the power supply voltage, and a diode connecting the collector of the triode to the power supply voltage. The collector is connected to the electrode ground. The pull-up resistor functions to clamp, and the diode functions to prevent static electricity.

14. The steam generating device according to claim 1, characterized in that, The control circuit further includes an indication circuit that indicates the working state of the controller by the lit or extinguished state, or by different lit states.

15. The steam generating device according to claim 1, characterized in that, The control circuit further includes a key control circuit. After receiving a manual key command, the key control circuit controls the motor to rotate forward, rotate backward or stop according to the manual key command.

16. The steam generating device according to claim 15, characterized in that, The key control circuit includes four keys respectively connected to the control signal terminals of the controller and a switch circuit respectively connected to the keys. Each switch circuit includes a field-effect transistor with its gate connected to the corresponding key, a first voltage-dividing resistor connected between the gate and the source of the field-effect transistor, a second voltage-dividing resistor connecting the drain to the power supply voltage, a third voltage-dividing resistor connecting the corresponding key to the power supply voltage, and a filter capacitor connected in parallel with the third voltage-dividing resistor. The keys respectively control the start / stop, forward rotation, reverse rotation, and acceleration of the motor. When the key is off, the field-effect transistor of the switch circuit corresponding to the key is in the cut-off state. When the key is pressed, the field-effect transistor of the switch circuit corresponding to the key is in the on state, sending a corresponding manual key command to the control signal terminal of the controller.

17. The steam generating device according to any one of claims 1 to 16, characterized in that, The voltage sampling circuit includes a voltage reduction circuit, an optical isolation circuit, and a follower circuit. The voltage reduction circuit includes a first comparator, a first sampling resistor and a second sampling resistor respectively connected between the positive and negative input terminals of the first comparator and the positive and negative voltage terminals of the coil, an isolation resistor connected between the positive input terminal and the isolated ground, and a first feedback resistor connected between the negative input terminal and the output terminal; the first sampling resistor and the second sampling resistor function to limit the current. The optical isolation circuit includes an optical isolation voltage sensor connected to the output terminal of the first comparator. The follower circuit includes a second comparator with its positive and negative input terminals respectively connected to the positive and negative output terminals of the optical isolation voltage sensor, and a protection resistor connected between the output terminal of the second comparator and the induced voltage output terminal. The protection resistor functions to prevent output short-circuit failure.

18. The steam generating device according to any one of claims 1 to 16, characterized in that, The current sampling circuit includes an amplified voltage circuit, an optical isolation circuit, and a follower circuit. The amplified voltage circuit includes a third comparator with its positive input terminal connected to the current signal output terminal, a current-limiting resistor connecting the negative input terminal of the third comparator to the isolated ground, and a second feedback circuit connected between the negative input terminal and the output terminal; the current-limiting resistor functions to limit the current. The optical isolation circuit includes an optical isolation voltage sensor connected to the output terminal of the third comparator. The follower circuit includes a fourth comparator with its positive and negative input terminals respectively connected to the positive and negative output terminals of the optical isolation voltage sensor, a protection capacitor connected between the positive and negative input terminals of the fourth comparator, and a protection resistor connected between the output terminal of the fourth comparator and the induced current output terminal. The protection capacitor functions to avoid interference from high-frequency AC signals and DC pulse signals, and the protection resistor functions to prevent output short-circuit failure.

19. The steam generating device according to any one of claims 1 to 16, characterized in that, The temperature sampling circuit includes a temperature processing circuit and a voltage amplification circuit. The temperature processing circuit includes a first temperature sampling circuit for sampling the temperature of the steam outlet of the coil and a second temperature sampling circuit for sampling the temperature of the coil. The first temperature sampling circuit includes a temperature sensor chip and a thermocouple connected to the positive and negative input terminals of the sensor chip. The thermocouple is disposed at the air jet of the coil. The voltage amplification circuit includes a fifth comparator with a positive input terminal connected to the output terminal of the sensor chip, a first voltage-dividing resistor connecting the negative input terminal of the fifth comparator to the electrode ground, and a second voltage-dividing resistor connected between the first voltage-dividing resistor and the output terminal of the fifth comparator. The amplification ratio of the voltage amplification circuit is determined by the first voltage-dividing resistor and the second voltage-dividing resistor; The second temperature sampling circuit includes a temperature signal conversion circuit, a signal interaction isolation circuit, and an isolation circuit. The temperature signal conversion circuit includes a thermocouple disposed on the coil and a temperature sensor with positive and negative input terminals connected to the thermocouple. The signal interaction isolation circuit includes an isolation chip communicatively connected to the temperature sensor, and an output terminal of the isolation chip is connected to the controller. The isolation circuit includes an isolated DC-DC converter, a negative output terminal of the isolated DC-DC converter is connected to the ground terminal of the temperature sensor, and a positive input terminal of the isolated DC-DC converter is connected to the power input terminal of the temperature sensor.

20. A steam ablation device, characterized in that, Comprising a steam generating device according to any one of claims 1 to 19, a perfusion device communicating with an input port of the coil in the steam generating device, and an ablation catheter communicating with an output port of the coil.

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