Ultrasonic generator control method, ultrasonic generator, storage medium and computer

Abstract

The invention provides an ultrasonic generator control method, an ultrasonic generator, a storage medium and a computer, when the ultrasonic generator meets a constant power mode switching condition, a second output target is obtained according to a preset rule, the output state is adjusted according to the second output target, and when the output power of a power supply is limited, the output state is adjusted. The output state is adaptively adjusted according to the resonance state trace offset characteristic caused by the actual load characteristic, the offset resonance point is tracked based on the traceable parameter, the output efficiency is increased, and the active power is improved. By dynamically adjusting the output target, the output state can be adjusted along with the change of the load, the reduction degree of the output efficiency caused by micro offset of a resonance point due to loading is reduced, the reduction degree of the active power due to the influence of the load is reduced, the cutting effect of the ultrasonic scalpel is guaranteed, and the operation effect is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an ultrasound generator control method, an ultrasound generator, a storage medium, and a computer. Background Technology

[0002] An ultrasonic scalpel is a medical device that uses high-frequency ultrasonic energy for tissue cutting and hemostasis. Its core principle is to convert electrical energy into mechanical vibration through a piezoelectric ceramic transducer, generating high-frequency ultrasonic waves of about 55.5 kHz. This causes the scalpel head to vibrate at a low amplitude (about 50-100 μm), breaking down tissue through selective thermal and cavitation effects, while simultaneously achieving precise cutting and hemostasis.

[0003] Ultrasonic scalpel systems typically employ phase-locked loop (PLL) frequency tracking technology. By controlling the phase difference between the power supply's output voltage and current, the frequency of the output drive signal is kept consistent with the mechanical resonant frequency (fs) of the ultrasonic scalpel, ensuring efficient conversion of electrical energy into mechanical vibration. Ideally, the output amplitude is maximized and cutting efficiency is optimal when the system operates at its resonant point. Current technologies employ various improvements to enhance the accuracy and speed of PLL frequency tracking, such as using dynamic parameter calculations or intelligent algorithms to better track and lock onto the resonant point fs, thereby maintaining stable output and effective cutting even when the system power is below its limit.

[0004] However, in-depth research by the inventors revealed that while existing technologies have made progress in resonant point tracking, they still have a fundamental limitation: their control objective is always to find and lock the mechanical resonant point (fs) in order to obtain the maximum output amplitude. This strategy is effective when the system output power has not reached its upper limit, but when cutting thick or dense tissues, the total output power of the ultrasonic generator reaches its upper limit, and the system has to enter a constant power mode. Under this power saturation state, continuing to pursue the resonant point fs will result in a low proportion of active power output from the system, with a large amount of power dissipated in reactive components, resulting in insufficient mechanical energy actually obtained by the scalpel, a decrease in cutting speed, and an inability to meet the requirements of efficient surgery. More importantly, because the interaction between the scalpel and the tissue being cut dynamically changes the load characteristics, causing a slight shift in the resonant point, existing solutions cannot further optimize energy conversion efficiency in constant power mode.

[0005] Therefore, there is an urgent need in this field for a method that can adaptively find and lock the optimal energy conversion efficiency point (such as the second resonant frequency fm) of the system in constant power mode to output maximum active power. This is not a simple frequency tracking problem, but a completely new problem involving the switching of power adaptive control strategies: that is, how to automatically switch from "pursuing maximum amplitude (constant current mode)" to "pursuing maximum efficiency (constant power mode)" by monitoring the power state, thereby solving the problem of insufficient active power output efficiency when the power is saturated. Summary of the Invention

[0006] The present invention aims to solve the fundamental problem mentioned in the background art: existing ultrasonic generators still use the mechanical resonant frequency fs as the control target in constant power mode, resulting in insufficient active power output efficiency and failing to meet the high load cutting requirements.

[0007] To address this issue, this invention employs theoretical analysis and simulation studies based on the equivalent circuit model of an ultrasonic scalpel. The study reveals that when the system output power reaches its upper limit, its theoretically optimal operating point is not the mechanical resonance point fs, but rather a point of maximum energy conversion efficiency (corresponding to the frequency fm). Operating at this point allows for the achievement of maximum active power output in constant power mode. However, this frequency fm is affected by dynamic loads and cannot be directly measured or tracked.

[0008] The core innovation of this invention lies in the discovery that the aforementioned maximum efficiency point fm corresponds to a specific voltage and current phase angle α, and that this phase angle α is not unknowable; it has a definite mathematical relationship with the system's static parameters (L0, C0) and the easily obtainable operating parameters (resonant frequency fs, voltage U, current I) in constant current mode. Based on this discovery, this invention fundamentally changes the control strategy in constant power mode, proposing a new method that uses the target phase angle α obtained through tracking calculations to replace the traditional method of tracking the zero phase angle, thereby indirectly and accurately enabling the system to operate near the maximum efficiency point fm.

[0009] Therefore, the purpose of this invention is to provide an ultrasonic generator control method that, through the above-mentioned innovative strategy, effectively solves the problem of low active power output efficiency caused by improper control targets in constant power mode, thereby ensuring the cutting effect of ultrasonic scalpel under high load conditions.

[0010] This invention provides a method for controlling an ultrasonic generator, comprising: When the ultrasonic generator is in constant current mode, the output state is adjusted according to a preset first output target. Monitor the operating condition of the ultrasonic generator, and switch to constant power mode when the preset constant power mode switching conditions are met based on the operating condition of the ultrasonic generator; When the ultrasonic generator is in constant power mode, a second output target is obtained according to a preset rule, and the output state is adjusted according to the second output target. In the constant power mode, the output efficiency of the second output target is greater than the output efficiency of the first output target.

[0011] Optionally, the step of obtaining the second output target according to a preset rule includes: The target output frequency of the ultrasonic generator is searched according to the preset rules, and the current output frequency of the constant power mode is adjusted to the target output frequency, which is the output frequency corresponding to the maximum output efficiency of the ultrasonic generator. The preset rule is to adjust the output frequency of the constant power mode so that the measured phase angle of the ultrasonic generator approaches the target phase angle, thereby searching for the target output frequency of the ultrasonic generator. The target phase angle is calculated by a preset formula.

[0012] Optionally, the step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle includes: The target phase angle of the current ultrasonic generator is calculated using the preset formula, and it is determined whether the measured phase angle of the current ultrasonic generator is close to the target phase angle. If not, adjust the output frequency of the constant power mode according to the preset frequency adjustment rules, and return to the step of calculating the target phase angle of the current ultrasonic generator using the preset formula and determining whether the measured phase angle of the current ultrasonic generator is close to the target phase angle; If so, the current output frequency of the constant power mode is output to search for the target output frequency of the ultrasonic generator.

[0013] Optionally, the preset formula is:

[0014] Where a is the target phase angle, arctan is the arctangent calculation formula, arc is the inverse trigonometric function calculation formula, U is the power supply output voltage at the first resonant frequency, I is the power supply output current at the first resonant frequency, Π is pi, fs is the first resonant frequency in the first output target, C0 is the capacitive reactance of the parallel equivalent capacitance of the target ultrasonic generator, and L0 is the inductive reactance of the parallel equivalent inductance of the target ultrasonic generator.

[0015] Optionally, it also includes: when the preset constant power mode switching conditions are met, switching the working mode of the ultrasonic generator to the constant power mode.

[0016] Optionally, the constant power mode switching condition includes at least one of the following: the current power of the ultrasonic generator is greater than or equal to a power threshold, the current current of the ultrasonic generator exceeds a current threshold, and the current voltage of the ultrasonic generator exceeds a voltage threshold.

[0017] Optionally, it also includes: When the ultrasonic generator is started, the working mode of the ultrasonic generator is set to the constant current mode, and it is determined whether the constant power mode switching condition is met.

[0018] Another aspect of the present invention provides an ultrasonic generator for use with an ultrasonic surgical scalpel, the ultrasonic generator comprising: The acquisition module is used to acquire the operating conditions of the ultrasonic generator; The main control module is used to control the working mode of the ultrasonic generator, which includes constant current mode and constant power mode. The phase-locked frequency tracking module is used to adjust the output voltage, output current, and output frequency of the ultrasonic generator according to the phase-locked frequency tracking target. The main controller is also used to regulate the working state of the ultrasonic generator according to the ultrasonic generator control method described above.

[0019] Optionally, the phase-locked frequency tracking target of the phase-locked frequency tracking module includes a phase angle, and the initial phase angle is zero.

[0020] Another aspect of the present invention provides an ultrasonic generator for use with an ultrasonic scalpel, the ultrasonic generator including a main controller, the main controller being used to regulate the working state of the ultrasonic generator according to the above-described ultrasonic generator control method.

[0021] The present invention also provides a storage medium, which is a computer-readable storage medium and stores a computer program, which, when read and run, is used to execute the above-described ultrasonic generator control method.

[0022] The present invention also provides a computer that stores a computer program, which, when read and run, is used to execute the above-described ultrasonic generator control method.

[0023] The ultrasonic generator control method provided by this invention switches to constant power mode when the constant power mode switching conditions are met in constant current mode. In constant power mode, a second output target is obtained according to preset rules, and the output state is adjusted according to the second output target to increase output efficiency. This invention, through mode switching, dynamically adjusts the output target to increase output efficiency when output efficiency decreases due to load influence, reducing the degree of output efficiency reduction caused by slight resonant point shifts due to load, thus ensuring the cutting effect of the ultrasonic scalpel and improving surgical outcomes. Attached Figure Description

[0024] Figure 1 This is a flowchart of the main process of the ultrasonic generator control method in the embodiments of the invention; Figure 2 This is an equivalent circuit diagram of the ultrasonic generator in the embodiments of the present invention; Figure 3 This is a schematic diagram of the main module structure of the ultrasonic generator in this embodiment of the invention; Figure 4 This is a flowchart of an ultrasonic generator control method provided in an embodiment of the present invention.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In practical applications, existing technologies involve interaction between the ultrasonic scalpel and the tissue being cut, which alters the load characteristics of the scalpel head and causes a shift in the resonant state. Under phase-locked loop (PLL) frequency tracking, the proportion of active power actually applied to the load decreases, resulting in lower-than-ideal cutting efficiency for the ultrasonic scalpel and reduced surgical outcomes. Furthermore, the load characteristics change when cutting different tissues or when the state of the tissue being cut changes, leading to a dynamic shift in the system's resonant state that is difficult to standardize and quantify.

[0030] To address the problems in the prior art, this application provides an ultrasonic generator control method, such as... Figure 1 As shown, it mainly includes: Step S01: When the ultrasonic generator is in constant current mode, adjust the output state according to the preset first output target; Step S02: Monitor the operating condition of the ultrasonic generator, and when the preset constant power mode switching condition is met based on the operating condition of the ultrasonic generator, switch to constant power mode; Step S03: When the ultrasonic generator is in constant power mode, a second output target is obtained according to a preset rule, and the output state is adjusted according to the second output target. In the constant power mode, the output efficiency of the second output target is greater than the output efficiency of the first output target.

[0031] Step S03 further includes searching for the target output frequency of the ultrasonic generator according to a preset rule, and adjusting the current output frequency of the constant power mode to the target output frequency, wherein the target output frequency is the output frequency corresponding to the maximum output efficiency of the ultrasonic generator. The preset rule is to adjust the output frequency of the constant power mode so that the measured phase angle of the ultrasonic generator approaches the target phase angle, thereby searching for the target output frequency of the ultrasonic generator. The target phase angle is calculated by a preset formula.

[0032] The target phase angle is obtained based on the following analysis, such as Figure 2 The figure shows the equivalent model of an ultrasonic scalpel, where S is the power supply of the main unit, L0 is the parallel equivalent inductance, C0 is the parallel equivalent capacitance, Lm is the series equivalent inductance, Cm is the series equivalent capacitance, and Rm is the dynamic load of the tissue being cut.

[0033] Based on theoretical analysis and simulation studies of the equivalent circuit model, the inventors discovered that the system has a theoretical maximum energy conversion efficiency point (corresponding to the second resonant frequency fm), at which the maximum active power output under constant power can be obtained. However, this frequency fm is affected by the dynamic load (Lm, Cm, Rm) and cannot be directly measured or tracked.

[0034] The key discovery of this invention is that the above-mentioned maximum efficiency point fm corresponds to a specific voltage and current phase angle α, and this phase angle α is not unknowable. It has a definite mathematical relationship with the static parameters (L0, C0) of the system and the operating parameters (resonant frequency fs, voltage U, current I) that are easily obtained in constant current mode.

[0035] Through theoretical derivation, the target phase angle α can be calculated and determined using the following preset formula: ;Formula (1) Where a is the target phase angle; arctan() is the arctangent function; π is pi; fs is the first resonant frequency determined by phase-locked loop frequency tracking under constant current mode; C0 is the parallel equivalent capacitance of the ultrasonic transducer (static parameter, which can be pre-calibrated); L0 is the parallel inductance matched with C0 (static parameter, which can be pre-calibrated); U is the power supply output voltage at the first resonant frequency (operating parameter, which can be measured in real time); and I is the power supply output current at the first resonant frequency (operating parameter, which can be measured in real time).

[0036] The theoretical basis of this formula lies in the fact that at the point of maximum efficiency fm, the equivalent reactance of the dynamic series resonant circuit (Lm-Cm-Rm) is zero, and its impedance is purely resistive. At this point, the total phase difference of the system is determined by the equivalent susceptance of the static parallel circuit (L0-C0), thus deriving the above mathematical relationship.

[0037] The engineering significance of this formula lies in its transformation of an optimal control objective (frequency fm) that cannot be directly measured into a control objective (phase angle α) that can be precisely calculated using known quantities. This provides a unique and feasible implementation path for subsequently tracking this phase angle using phase-locked loop (PLL) technology, thereby indirectly stabilizing the system to operate near its maximum efficiency point.

[0038] It should be noted that the "maximum energy conversion efficiency point (fm)" mentioned in this paper is a theoretical optimum derived from an equivalent circuit model. In practical applications, especially under dynamic load conditions, the essence of the method described in this invention lies in tracking the target phase angle α (which can be directly obtained based on theory and available data) to make the system operate near this theoretical optimum, thereby achieving significant optimization and stabilization of active power output efficiency.

[0039] In practical applications, the parameter range of the equivalent model is: L0∈(1.6mH, 2.4mH), C0∈(3.28nF, 4.92nF), Lm∈(0.3H, 1.5H), Cm∈(6pF, 30pF), Rm∈(50Ω, 500Ω). Based on this, frequency sweep simulation tests (simulation under ideal conditions) are carried out, and some of the test results are shown in Tables 1, 2, 3, 4 and 5.

[0040] Table 1:

[0041] Table 2:

[0042] Table 3:

[0043] Table 4:

[0044] Table 5:

[0045] Where f0 is the static resonant frequency, fs is the first resonant frequency obtained by phase-locked loop frequency tracking when the maximum current is reached in constant current mode, fm is the second resonant frequency obtained based on dynamic equivalent parameters, Y0 is the parallel equivalent susceptance of L0 and C0, and its constraint condition is |Y0| maximum value < 1 / 1370S ≈ 0.000729927 (S is the unit of conductance, susceptance and admittance), Xm is the series equivalent reactance of Lm and Cm, Bm is the equivalent susceptance jBm of jXm and Rm in series to parallel, G is the equivalent conductance jXm and Rm in series to parallel, j is a complex number, and K is the output efficiency (the proportion of active power).

[0046] The theoretical formula for K is: ; Since Xm is a dynamic parameter and Rm is related to the tissue being cut, it is difficult to directly solve for a fixed value.

[0047] As shown in Table 1, the output efficiency at the second resonant frequency fm is significantly greater than that at the first resonant frequency fs, and the difference from the maximum efficiency is small. Since the maximum efficiency point is difficult to solve directly, this application uses the second resonant frequency fm as the control target. As shown in Tables 1 and 2, under the condition of no deviation in L0 and C0, the change in dynamic load Rm has no significant impact on the resonant frequency, and there is no shift in the resonant frequency. As shown in Tables 1, 3, 4, and 5, the main influencing factors for the shift in the resonant frequency are L0 and C0, while the shift caused by Lm and Cm is minimal.

[0048] In the above tests, the difference between the second resonant frequency fm and the first resonant frequency fs is extremely small, making it difficult to achieve through frequency modulation. Furthermore, the applicant also discovered that at the second resonant frequency fm, there is a phase difference between the voltage and current of the power supply, and through phasor analysis, this phase difference (target phase angle a) satisfies formula (2): ; At the second resonant frequency fm, Xm=0, Rm=U / I, Y0=2*Π*fs*C0-1 / (2*Π*fs*C0*L0), substituting into tan(a), we get formula (1): ; Where U is the power supply output voltage at the first resonant frequency, I is the power supply output current at the first resonant frequency, fs can be obtained by phase-locked frequency tracking in constant current mode, the phase-locking angle of phase-locked frequency tracking in constant current mode is 0, C0 and L0 are fixed parameters of the system. After the hardware design is completed, they are fixed values. Considering the deviation caused by the machining tolerance, their actual values ​​can be tested and calibrated by the equipment manufacturer.

[0049] The step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle includes: The target phase angle of the current ultrasonic generator is calculated using the preset formula, and it is determined whether the measured phase angle of the current ultrasonic generator is close to the target phase angle. If not, adjust the output frequency of the constant power mode according to the preset frequency adjustment rules, and return to the step of calculating the target phase angle of the current ultrasonic generator using the preset formula and determining whether the measured phase angle of the current ultrasonic generator is close to the target phase angle; If so, the current output frequency of the constant power mode is output to search for the target output frequency of the ultrasonic generator.

[0050] In an optional embodiment, the step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle is achieved by phase-locked loop frequency tracking. In phase-locked loop frequency tracking, closed-loop control can be performed by a PID (proportional-integral-derivative) controller or the like. It obtains the real-time phase angle of the output voltage and output current based on the phase information of the power supply's output voltage and output current, and obtains the real-time difference between the real-time phase angle and the target phase. The output frequency is adjusted according to the real-time difference until the real-time difference is eliminated, thus ensuring control reliability.

[0051] Depending on the working state, ultrasonic scalpels often have multiple working modes. The output efficiency control is mainly applied in constant power mode. To ensure the effectiveness of the control operation based on the target phase angle, it also includes: when the preset constant power mode switching conditions are met, the working mode of the ultrasonic generator is switched to constant power mode, which can avoid the interference of the original working mode by the phase angle control being accidentally started, and ensure the working efficiency of each working mode.

[0052] Specifically, the constant power mode switching condition includes at least the current power of the ultrasound generator being greater than or equal to the power threshold. The power threshold is usually a safety threshold. When the current power is greater than the power threshold, switching to constant power mode can limit the output power within a safe range, avoid safety accidents, and improve surgical safety.

[0053] To avoid damage to electronic devices from high current, the constant power mode switching conditions also include the current current exceeding the current threshold or the current voltage exceeding the voltage threshold. The current threshold and voltage threshold are corresponding safety thresholds and are pre-calibrated.

[0054] To improve the startup speed of the ultrasonic generator, this embodiment further includes: when the ultrasonic generator starts, setting the operating mode of the ultrasonic generator to constant current mode, and determining whether the current constant power mode switching condition is met. In constant current mode, the drive current is large, which can quickly start the ultrasonic generator. At the same time, the system status is detected to determine whether the current constant power mode switching condition is met, so as to switch to constant power mode in time when the startup power is too high, thus ensuring safety while balancing startup speed.

[0055] In constant current mode, the active power is mainly affected by the total output power. At this time, the resonant point is located at the first resonant frequency fs. In order to improve the output efficiency in constant current mode, in this embodiment, after the step of setting the working mode of the ultrasonic generator to constant current mode when the ultrasonic generator is started, it also includes: locking the output frequency of the ultrasonic generator to the first resonant frequency through a phase-locked loop. The first resonant frequency is obtained through the fixed parameters of the system and is a preset value.

[0056] To determine the timing of mode switching, this embodiment further includes: monitoring the operating condition of the ultrasonic generator, and switching the operating mode of the ultrasonic generator to constant power mode when the current operating condition meets the preset constant power mode switching conditions.

[0057] The information corresponding to the operating conditions of the ultrasonic generator includes the real-time output current, real-time output power, real-time output voltage, and real-time output frequency of the power supply.

[0058] As a specific example, in this embodiment, the constant power mode switching conditions include: the real-time output current reaching a preset maximum current threshold, and the real-time output power exceeding a preset maximum power threshold. The maximum current threshold and maximum power threshold are typically safety thresholds and can be obtained from the device parameter manual.

[0059] To facilitate the rapid start-up of the ultrasonic scalpel, in this embodiment, the ultrasonic generator is first started in constant current mode, and the operating condition of the ultrasonic generator is monitored. When the current operating condition meets the preset constant power mode switching conditions, it is switched to the constant power mode.

[0060] The target phase angle α can be predetermined in constant current mode, allowing for rapid response when switching to constant power mode, improving the stability of effective output power, the stability of cutting effect during surgery, and ultimately, the surgical outcome. Furthermore, it requires minimal system computing resources and has low modification costs. The required power output voltage, power output current, and first resonant frequency are readily available, ensuring high data accuracy and guaranteeing the reliability and effectiveness of control.

[0061] In a specific instance, such as Figure 4 As shown, after the ultrasonic scalpel is powered on, the main controller first performs a self-check to confirm its normal performance. It then interacts with the transducer and the main unit to obtain the parameter C0 of the parallel equivalent capacitance from the transducer and the parameter L0 of the parallel efficiency inductance from the main unit. After confirmation, cutting can begin. This process is relatively short, and sufficient preparation time before cutting ensures completion. In practical applications, for example, the scalpel can provide audible alerts to the surgeon to ensure the effectiveness of the control scheme described in this application.

[0062] When cutting begins, the machine first operates in constant current mode. During cutting in constant current mode, the first resonant frequency fs (the resonant frequency when the safe current threshold is reached in constant current mode) is obtained by confirming the phase-locked loop frequency tracking, as well as the output voltage U and output current I at this time. After confirmation, the tangent value tan(a) of the target phase angle is pre-calculated according to formula (2).

[0063] When the current threshold is reached in constant current mode, it is determined that the constant current mode switching condition is met, and the mode is switched to constant power mode. In constant power mode, it is determined whether the current power P has reached the power threshold Pmax.

[0064] When the current power P reaches the power threshold Pmax, the target phase angle a is calculated by looking up the table based on the tangent value tan(a) and the arctangent function, and the phase shift is started. The target phase angle a is used as the phase-locked target for phase-locked frequency tracking until the phase shift is completed and the working state is fixed. When the current power P does not reach the power threshold Pmax, the phase shift is directly determined to be completed and the working target of phase-locked frequency tracking is fixed.

[0065] By adjusting the power output of the ultrasonic scalpel under the current load condition, the active power can be maximized, reducing the impact of load-induced resonant state shift and subsequent reduction in actual active power. This ensures cutting efficiency under various operating conditions and improves surgical outcomes.

[0066] According to the data in Tables 1 to 5, the output efficiency at the second resonant frequency fm is not the maximum, and the difference between it and the maximum output efficiency is small. Therefore, the maximum efficiency in this application mainly refers to the output efficiency at the effectively controllable second resonant frequency fm. The target phase angle α can be predetermined in constant current mode. Therefore, in practical applications, after rapid phase-locked looping to the second resonant frequency, there is still some operational space, which can be combined with other artificial intelligence control methods to further improve output efficiency. Thus, the ultrasonic generator control method of this invention also has good embeddability and a wide range of applications.

[0067] The present invention also provides an ultrasonic generator for use with an ultrasonic scalpel, such as... Figure 3 As shown, the ultrasonic generator includes: The acquisition module 21 is used to acquire the operating conditions of the ultrasonic generator 10, including the power supply voltage, current, and output frequency of the ultrasonic generator 10. The main control module 22 is used to control the working mode of the ultrasonic generator 10. The working mode includes at least the constant power mode in the constant current mode and the constant power mode, as well as the adjustment of the working state of the ultrasonic generator according to the working conditions of the ultrasonic generator. Phase-locked frequency tracking module 23 is used to adjust the output voltage, output current and output frequency of the ultrasonic generator according to the phase-locked frequency tracking target; The main controller 22 is also used to obtain the target phase angle α according to the above-mentioned ultrasonic generator control method, and provide the target phase angle α to the phase-locked frequency tracking module 23 to adjust the phase-locked frequency tracking target, thereby adjusting the output efficiency of the ultrasonic generator.

[0068] The phase-locked loop (PLL) frequency tracking module 23 is further used to update the initial phase angle to the target phase angle when acquiring the target phase angle, where the initial phase angle is zero. The output target mainly includes the phase angle target and the frequency target of the PLL frequency tracking. In constant current mode, the phase angle target of the first output target is 0, and the frequency target is the first resonant frequency fs (the mechanical resonant frequency obtained from the static parameters). The present invention also provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is read and run, it is used to execute the above-described ultrasonic generator control method.

[0069] The present invention also provides a computer that stores a computer program, which, when read and run, is used to execute the above-described ultrasonic generator control method.

[0070] Those skilled in the art will understand that the logic or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable storage medium" can mean any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0071] More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable storage media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0072] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0073] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The embodiments described above are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for controlling an ultrasonic generator, characterized in that, include: When the ultrasonic generator is in constant current mode, the output state is adjusted according to a preset first output target. Monitor the operating condition of the ultrasonic generator, and switch to constant power mode when the preset constant power mode switching conditions are met based on the operating condition of the ultrasonic generator; When the ultrasonic generator is in constant power mode, a second output target is obtained according to a preset rule, and the output state is adjusted according to the second output target. In the constant power mode, the output efficiency of the second output target is greater than the output efficiency of the first output target.

2. The ultrasonic generator control method according to claim 1, characterized in that, The step of obtaining the second output target according to the preset rules includes: The target output frequency of the ultrasonic generator is searched according to the preset rules, and the current output frequency of the constant power mode is adjusted to the target output frequency, which is the output frequency corresponding to the maximum output efficiency of the ultrasonic generator. The preset rule is to adjust the output frequency of the constant power mode so that the measured phase angle of the ultrasonic generator approaches the target phase angle, thereby searching for the target output frequency of the ultrasonic generator. The target phase angle is calculated by a preset formula.

3. The ultrasonic generator control method according to claim 2, characterized in that, The step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle includes: The target phase angle of the current ultrasonic generator is calculated using the preset formula, and it is determined whether the measured phase angle of the current ultrasonic generator is close to the target phase angle. If not, adjust the output frequency of the constant power mode according to the preset frequency adjustment rules, and return to the step of calculating the target phase angle of the current ultrasonic generator using the preset formula and determining whether the measured phase angle of the current ultrasonic generator is close to the target phase angle; If so, the current output frequency of the constant power mode is output to search for the target output frequency of the ultrasonic generator.

4. The ultrasonic generator control method according to claim 3, characterized in that, The preset formula is: Where a is the target phase angle, arctan is the arctangent calculation formula, arc is the inverse trigonometric function calculation formula, U is the power supply output voltage at the first resonant frequency, I is the power supply output current at the first resonant frequency, Π is pi, fs is the first resonant frequency in the first output target, C0 is the capacitive reactance of the parallel equivalent capacitance of the target ultrasonic generator, and L0 is the inductive reactance of the parallel equivalent inductance of the target ultrasonic generator.

5. The ultrasonic generator control method according to claim 4, characterized in that, The constant power mode switching conditions include at least one of the following: the current power of the ultrasonic generator is greater than or equal to the power threshold, the current current of the ultrasonic generator exceeds the current threshold, and the current voltage of the ultrasonic generator exceeds the voltage threshold.

6. The ultrasonic generator control method according to claim 4 or 5, characterized in that, Also includes: When the ultrasonic generator is started, the working mode of the ultrasonic generator is set to the constant current mode, and it is determined whether the constant power mode switching condition is met.

7. An ultrasonic generator for use with an ultrasonic surgical scalpel, characterized in that, The ultrasonic generator includes: The acquisition module is used to acquire the operating conditions of the ultrasonic generator; The main control module is used to control the working mode of the ultrasonic generator, which includes constant current mode and constant power mode, and to adjust the working state of the ultrasonic generator according to the working conditions of the ultrasonic generator. The phase-locked frequency tracking module is used to adjust the output voltage, output current, and output frequency of the ultrasonic generator according to the phase-locked frequency tracking target. The main controller is further configured to regulate the working state of the ultrasonic generator according to any one of claims 1 to 6, thereby adjusting the output efficiency of the ultrasonic generator.

8. The ultrasonic generator according to claim 7, characterized in that, The phase-locked frequency tracking target of the phase-locked frequency tracking module includes the phase angle, and the initial phase angle is zero.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium and stores a computer program, which, when read and run, is used to execute the ultrasonic generator control method according to claims 1 to 6.

10. A computer, characterized in that, The computer stores a computer program, which, when read and run, is used to execute the ultrasonic generator control method according to claims 1 to 6.

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