Output power adaptive control system and method

Abstract

The present invention proposes an output power adaptive control system and method. In the system, a signal acquisition circuit is used to collect actual voltage signals and actual current signals at the load end; a controller obtains the actual voltage value and actual current value at the load end, and the controller calculates the corresponding target pulse width, target voltage value, and target current value according to the target power. The controller sends a drive signal of a preset pulse width to the power supply circuit based on the target pulse width, and the preset pulse width is less than the target pulse width, and the preset pulse width is regulated by the size of the actual voltage value compared to the target voltage value and the size of the actual current value compared to the target current value; the power supply circuit is connected to the controller, and in response to the preset pulse width sent by the controller, output power is applied to the load end until the target power is reached. The system realizes adaptive adjustment of the output power of the power supply circuit, so that the output power of the load meets the working requirements.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an output power adaptive control system and method, which are particularly suitable for high-power energy platforms. Background Art

[0002] With the continuous advancement of science and technology, many modern medical devices have developed rapidly, especially high-power energy platforms that need to be in direct contact with the human body, such as high-frequency electrosurgical units, large vascular staplers, argon gas knives, and Lip knives. These high-power energy platforms have strict requirements on output power, but in actual work, due to various objective reasons, the accuracy of high-power energy platforms in adjusting the actual output power is not high, making it difficult to meet the requirements of national standards.

[0003] Take the high-frequency electrosurgical unit as an example. It is an electrosurgical instrument commonly used in hospital surgical operations. It applies high-frequency voltage between the electrode tip and human tissue and uses the heat generated by the high-frequency current to achieve simultaneous cutting and coagulation, reduce intraoperative bleeding, make the surgical field clear, and shorten the operation time, which is beneficial to the accuracy and speed of the doctor's surgical operations.

[0004] Traditional high-frequency electrosurgical units have a variety of fixed output modes, and the corresponding power output in each fixed output mode is constant. However, the impedance of human tissue will change during the operation, and the impedance value will change from small to large. Specifically, due to the high water content of human tissue, the moisture in the human tissue evaporates after being burned by the high-frequency electrosurgical unit, leaving only burnt protein, which causes the impedance conductivity to deteriorate and the impedance value to increase. Since the output power cannot be adjusted, the constant output power cannot adapt to the actual output power requirements required by the real-time changing impedance, and when the constant output power is too low compared to the actual output power, the smoothness of the operation cannot be guaranteed; when the constant output power is too large compared to the actual output power, it will affect the safety of the surgical system and increase thermal damage to the tissue.

[0005] The output power range of traditional high-frequency electrosurgical units is between 0 and 300W, and the voltage at the output end of the high-frequency electrosurgical unit reaches 0 to 4000V. Since there is a nonlinear relationship between the output power and the drive signal PWM that controls the output energy on the high-frequency electrosurgical unit, the calculation complexity and amount of computation of the algorithm are increased, resulting in a large error in the output energy, inaccurate calculation results, and difficulty in meeting the error range specified by the national standard for the energy output of high-frequency electrosurgical units.

[0006] Therefore, there is an urgent need to provide an output power adaptive control technology suitable for high-power energy platforms. Summary of the invention

[0007] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the present invention is to provide an output power adaptive control system and method, which is particularly suitable for adaptive regulation of the output power of a high-power energy platform.

[0008] In order to achieve the above-mentioned object of the present invention, the present invention provides an output power adaptive control system, comprising:

[0009] A signal acquisition circuit, wherein the signal acquisition circuit is used to acquire an actual voltage signal and an actual current signal of a load end;

[0010] A controller, wherein the controller obtains an actual voltage value and an actual current value at a load end, the controller calculates a corresponding target pulse width, a target voltage value, and a target current value according to a target power, the controller sends a drive signal of a preset pulse width to a power supply circuit based on the target pulse width, the preset pulse width is smaller than the target pulse width, and the controller adaptively controls the preset pulse width in response to the magnitude of the actual voltage value compared to the target voltage value and the magnitude of the actual current value compared to the target current value until the target pulse width is reached;

[0011] A power supply circuit is connected to the controller and applies output power to the load end in response to a preset pulse width sent by the controller until a target power is reached.

[0012] The output power adaptive control system has a simple structure. The controller outputs a driving signal to the power supply circuit according to the target pulse width value, target current value, target voltage value of the power supply circuit corresponding to the target power, and the actual voltage and actual current signal at the load end, thereby realizing adaptive adjustment of the output power of the power supply circuit so that the output power of the load meets the working requirements.

[0013] Optionally, the signal acquisition circuit includes a voltage acquisition circuit and a current acquisition circuit;

[0014] The voltage sampling circuit is connected to the load end to collect the actual voltage signal of the load end, and the actual voltage signal is converted into an actual voltage value by the analog / digital conversion circuit and sent to the controller;

[0015] The current sampling circuit is connected to the load end to collect the actual current signal of the load end. The actual current signal is converted into an actual current value by the analog / digital conversion circuit and sent to the controller.

[0016] This enables the collection of the actual voltage value and actual current value at the load end.

[0017] Optionally, the power supply circuit includes a main power supply and a first rectifier circuit module connected to the main power supply, wherein the first rectifier circuit module is externally connected to a mains power supply and converts an AC power signal into a DC power signal and transmits the converted DC power signal to the main power supply.

[0018] Optionally, the power supply circuit also includes a second rectifier circuit module and a power amplifier module; the input end of the second rectifier circuit module is connected to the output end of the main power supply to convert the DC signal output by the main power supply into an AC signal, and the output end of the second rectifier circuit module is connected to the input end of the power amplifier module, which amplifies the voltage signal and current signal output by the second rectifier circuit module and then loads them to the load end.

[0019] The present invention also proposes an output power adaptive control method for the above output power adaptive control system, comprising the following steps:

[0020] S1, planning multiple target intervals of output power, and constructing a linear relationship between the pulse width, voltage value and current value corresponding to the output power in each target interval;

[0021] S2, obtaining a target power and determining a target interval corresponding to the target power, and calculating a corresponding target pulse width, a target voltage value, and a target current value based on the linear relationship;

[0022] S3, setting a preset pulse width based on the target pulse width and making the preset pulse width smaller than the target pulse width, and driving the power supply circuit to apply output power to the load end with the preset pulse width;

[0023] S4, obtaining the actual voltage value and the actual current value of the load end;

[0024] S5, adaptively adjusting the preset pulse width by using the difference between the actual current value and the target current value, and the difference between the actual voltage value and the target voltage value, until the target pulse width is reached;

[0025] S6, driving the power supply circuit with the target pulse width to apply target power to the load end.

[0026] In the method, the controller outputs a driving signal to the power supply circuit according to the target pulse width value, target current value, target voltage value of the power supply circuit corresponding to the target power, as well as the actual voltage and actual current signals at the load end, and drives the power supply circuit to output the corresponding power so that the load operates at the target power, thereby realizing adaptive adjustment of the output power of the power supply circuit so that the output power of the load meets the working requirements.

[0027] In an optional solution of the method for adaptively controlling the output power of the high-frequency electrosurgical unit,

[0028] The method for planning multiple target intervals of output power is:

[0029] Test various output modes of the high-power energy platform, set the output power range of various output modes, obtain the relationship curve between the pulse width output by the controller and the output power, the relationship curve between the output power and the output current, and the relationship curve between the output power and the output voltage;

[0030] Find N power points within the output power range of various output modes, where N is a positive integer, and divide the output power range of various output modes into N-1 target intervals.

[0031] This optional solution makes the output power in each target interval approximately linearly related to the corresponding pulse width value, voltage value and current value, making the calculation more convenient.

[0032] In an optional solution of the method for adaptively controlling the output power of a high-frequency electrosurgical unit, the method for determining the pre-target pulse width value, the target voltage value, and the target current value is as follows:

[0033] If the target power p is in the nth target interval, 1≤n≤N-1, then its corresponding target pulse width value pwm(p) is

[0034] pwm(p)=k 1n (pp n )+pwm n ,

[0035] Among them, k 1n is the slope of the pulse width-power curve in interval n, p n is the power value of the initial point of interval n, pwm n is the pulse width value of the initial point of interval n;

[0036] The target voltage value V(p) is

[0037] V(p)=k 2n (pp n )+V n ,

[0038] Among them, k 2n is the slope of the voltage-power curve in interval n, p n is the power value of the initial point of interval n, V n is the voltage value of the initial point of interval n;

[0039] The target current value I(p) is

[0040] I(p)=k 3n (pp n )+I n

[0041] Among them, k 3nis the slope of the current-power curve in interval n, p n is the power value of the initial point of interval n, I n is the current value at the initial point of interval n.

[0042] In an optional solution of the method for adaptively controlling the output power of the high-frequency electrosurgical knife, the method for controlling the preset pulse width value by using the magnitude of the actual voltage value compared to the target voltage value, and the magnitude of the actual current value compared to the target current value is:

[0043] If the actual current value is greater than the target current value, the preset pulse width value is reduced;

[0044] If the actual current value is less than the target current value, the preset pulse width value is increased;

[0045] If the actual voltage value is greater than the target voltage value, the preset pulse width value is reduced;

[0046] If the actual voltage value is less than the target voltage value, the preset pulse width value is increased.

[0047] In an optional solution of the method for adaptively controlling the output power of a high-frequency electrosurgical unit, there is a pre-judgment step between steps S4 and S5:

[0048] Determine whether the absolute value of the difference between the current actual current value and the target current value is greater than the current difference threshold;

[0049] If so, execute step S5 to adjust the target pulse width by comparing the actual current value with the target current value; if not, determine whether the absolute value of the difference between the current actual voltage value and the target voltage value is greater than the voltage difference threshold. If so, execute step S5 to adjust the target pulse width by comparing the actual voltage value with the target voltage value. If not, do not adjust the current pulse width.

[0050] Taking into account the hardware error, this optional solution determines whether the system has entered the target pulse width adjustment by comparing the absolute difference between the current current and the expected current with the current difference threshold. The target pulse width is adjusted only when the requirements are met, otherwise no adjustment is made, which can reduce the amount of calculation. In addition, the present invention is a constant power regulation. This optional solution adjusts the preset pulse width by first comparing the current and then comparing the voltage, ensuring the safety of the system and the output of constant power.

[0051] In an optional solution of the method for adaptively controlling the output power of the high-frequency electrosurgical knife, a PID control method, an adaptive control method, a predictive control method, or a fuzzy control method is used to control the preset pulse width.

[0052] Beneficial effects of the present invention: Since there is a nonlinear relationship between the output power of loads such as high-power energy platforms and the PWM pulse signal output by the controller, the present invention divides the output power range into target intervals with different gradients, performs different controls in each target interval, and improves the accuracy of control; by comparing the absolute difference between the actual current and the target current value with the current difference threshold value, and comparing the absolute value of the difference between the actual voltage and the target voltage value with the voltage difference threshold value, the amount of calculation can be reduced and the error of the load output power can be reduced; in the process of regulating the load output power, the target power is calibrated to the target interval before the calculation is performed, and the response is fast, so that the target power can be reached quickly and stably, and constant power regulation is realized. Based on the present invention's adaptive regulation of the output power of a high-power energy platform, the error of the output power can be controlled within the error range specified by the national standard, or even lower than the error range specified by the national standard.

[0053] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0055] Figure 1 It is a principle block diagram of the first embodiment;

[0056] Figure 2 It is a curve diagram showing the relationship between the pulse energy value PWM output by the controller and the output power P of the high-frequency electrosurgical knife in the pure cutting mode;

[0057] Figure 3 This is the relationship curve between the high-frequency electrosurgical unit output power P and the output current in pure cutting mode;

[0058] Figure 4 It is the relationship curve between the output power P and the output voltage of the high-frequency electrosurgical knife in the pure cutting mode;

[0059] Figure 5 It is a schematic diagram of the flow chart of the second embodiment;

[0060] Figure 6 It is the high frequency output power adjustment response curve of the electrosurgical knife. DETAILED DESCRIPTION

[0061] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0062] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0063] Embodiment 1

[0064] like Figure 1 As shown, the present invention provides an output power adaptive control system, which is particularly suitable for high-power energy platforms, such as high-frequency electrosurgical units.

[0065] The output power adaptive control system in this embodiment includes a power supply circuit, a signal sampling circuit and a controller. Among them, the signal acquisition circuit is used to collect the actual voltage signal and the actual current signal of the load end; the controller is connected to the signal acquisition circuit, obtains the actual voltage value and the actual current value of the load end, calculates the corresponding target pulse width, target voltage value and target current value according to the target power, and the controller sends a driving signal of a preset pulse width to the power supply circuit based on the target pulse width, the preset pulse width is less than the target pulse width, and the controller responds to the size of the actual voltage value compared to the target voltage value and the size of the actual current value compared to the target current value. Adaptively control the preset pulse width until the target pulse width is reached; the power supply circuit is connected to the controller, and responds to the preset drive signal sent by the controller to apply output power to the load end until the target power is reached, so that the load output power signal is stable.

[0066] In this embodiment, the power supply circuit includes a main power supply, a first rectifier circuit module connected to the main power supply, a second rectifier circuit module and a power amplifier module. The first rectifier circuit module is externally connected to the main power supply and converts the AC signal into a DC signal and transmits it to the main power supply; the input end of the second rectifier circuit module is connected to the output end of the main power supply, and the output end of the second rectifier circuit module is connected to the input end of the power amplifier module. The main power supply receives the DC signal output by the first rectifier circuit module, receives the driving signal output by the controller, and outputs a DC signal according to the signal. The DC signal is input to the second rectifier circuit module, and the second rectifier circuit module converts the DC signal into an AC signal. The AC signal is amplified by the power amplifier module and provided to the load to provide working power for the load. Preferably, but not limited to, the main power supply is a DC-DC power supply module.

[0067] In this embodiment, the signal acquisition circuit includes a voltage acquisition circuit and a current acquisition circuit, and the output ends of the current acquisition circuit and the voltage sampling circuit are respectively connected to two sampling signal input ports of the controller. The voltage sampling circuit is connected to the load end, and the actual voltage signal of the load end is collected, and the actual voltage signal collected here is an analog signal. The collected actual voltage signal is converted into an actual voltage value that can be read by the controller through an analog / digital conversion circuit and transmitted to the controller. The current sampling circuit is connected to the load end, and the actual current signal of the load end is collected, and the actual current signal collected here is an analog signal. The collected actual current signal is converted into an actual current value that can be read by the controller through an analog / digital conversion circuit and transmitted to the controller. In this embodiment, the analog / digital conversion circuit can be integrated into the signal acquisition circuit, or it can be independently set. Preferably, but not limited to, the current sampling circuit is a mutual inductance coil circuit connected in series to the load end, and the voltage sampling circuit is a secondary transformer circuit connected in parallel to the load end.

[0068] The driving signal in this embodiment is preferably a PWM signal.

[0069] Embodiment 2

[0070] like Figure 5 As shown, the present invention also provides an output power adaptive control method, comprising the following steps:

[0071] S1, planning multiple target intervals of output power, and constructing a linear relationship among pulse width, voltage value and current value corresponding to the output power in each target interval.

[0072] In this embodiment, multiple target intervals of output power are planned by the following steps:

[0073] At room temperature, various output modes of the high-power energy platform are tested, and the output power range of various output modes is set to obtain the relationship curve between the pulse width (i.e., PWM value) output by the controller and the output power P, the relationship curve between the output power P and the output current, and the relationship curve between the output power P and the output voltage. N power points are found within the output power range of various output modes, where N is a positive integer, and the output power range of various output modes is divided into N-1 target intervals. In each target interval, the output power is linearly related to its corresponding pulse width, voltage value, and current value.

[0074] Taking the pure cutting output mode of the high-frequency electrosurgical unit as an example, the pure cutting output mode of the high-frequency electrosurgical unit is tested at room temperature, and its output power is set to 0-300W. Find 15 coordinate points in the interval [0,300] and divide them into the following 14 target intervals, as follows:

[0075] [1,5],[5,10],[10,25],[25,50],[50,70],[70,90],[90,120],[120,150],[150,180],[180,210],[210,240],[240,260],[260,280],[280,300]. Use an electric knife analyzer in conjunction with a high-frequency electric knife to obtain the PWM value, voltage value, and current value output by the high-frequency electric knife at 15 power points. The corresponding relationship curves of the PWM value output by the controller and the output power P, the relationship curves of the output power P and the output current, and the relationship curves of the output power P and the output voltage are as follows: Figures 2 to 4 As shown. Figure 2 As shown, the relationship between the PWM value and the output power P is generally nonlinear, but within each target range, the curve is approximately linear.

[0076] Then, S2, the target power is obtained and the target interval corresponding to the target power is determined, and the corresponding target pulse width PWM_des, target voltage value U_des and target current value I_des are calculated based on the linear relationship.

[0077] Specifically, after obtaining the target power, the controller can automatically locate the target interval corresponding to the target power, and then calculate the target pulse width PWM_des, target current value I_des, and target voltage value U_des corresponding to the target power according to the linear relationship corresponding to the target interval.

[0078] In this embodiment, based on the relationship curve between the PWM value output by the controller and the load output power P, in each target interval, the method for determining the target pulse width PWM_des, the target current value I_des, and the target voltage value U_des is as follows:

[0079] If the target power p is in the nth target interval, 1≤n≤N-1, then its corresponding target pulse width PWM_des(p) is:

[0080] PWM_des(p)=k 1n (pp n )+pwm n ,

[0081] Among them, k 1n is the slope of the pulse width-power curve in interval n, p n is the power value of the initial point of interval n, pwm n is the pulse width of the initial point of interval n.

[0082] The target voltage value V_des(p) is

[0083] V_des(p)=k2n (pp n )+V n ,

[0084] Among them, k 2n is the slope of the voltage-power curve in interval n, p n is the power value of the initial point of interval n, V n is the voltage value at the initial point of interval n.

[0085] The target current value I_des(p) is

[0086] I_des(p)=k 3n (pp n )+I n

[0087] Among them, k 3n is the slope of the current-power curve in interval n, p n is the power value of the initial point of interval n, I n is the current value at the initial point of interval n.

[0088] S3, based on the target pulse width, a preset pulse width is set and the preset pulse width is set to be smaller than the target pulse width, and the controller outputs the preset pulse width to drive the power supply circuit to output the output power acting on the high-power energy platform, preferably outputting 3 / 4*PWM_des(p) as the preset pulse width pwm_cur. Then, step S4 is executed to obtain the actual voltage value U_cur and the actual current value I_cur fed back by the high-power energy platform.

[0089] S5. Adaptively control the preset pulse width by comparing the actual current value I_cur with the target current value I_des, and comparing the actual voltage value U_cur with the target voltage value U_des, until the target pulse width is reached.

[0090] Optionally, in this embodiment, if the actual current value I_cur is greater than the target current value I_des, the preset pulse width is reduced; if the actual current value I_cur is less than the target current value I_des, the preset pulse width is increased; if the actual voltage value U_cur is greater than the target voltage value U_des, the preset pulse width is reduced; if the actual voltage value U_cur is less than the target voltage value U_des, the preset pulse width is increased.

[0091] In order to make the output power more accurately constant, there is a pre-judgment step between steps S4 and S5:

[0092] Determine whether the absolute value of the difference between the current actual current value I_cur and the target current value I_des is greater than the current difference threshold Im; if so, execute step S5 to adjust the preset pulse width according to the size of the actual current value I_cur compared to the target current value I_des; if not, determine whether the absolute value of the difference between the current actual voltage value U_cur and the target voltage value U_des is greater than the voltage difference threshold Um, if so, execute step S5 to adjust the preset pulse width according to the size of the actual voltage value U_cur compared to the target voltage value U_des, if not, do not adjust the current pulse width.

[0093] Specifically, when adjusting the preset pulse width, a PID control method, an adaptive control method, a predictive control method, or a fuzzy control method may be used.

[0094] Taking the PID control method as an example, the controller compares the absolute value of the difference between the current actual current value I_cur and the target current value I_des and the current difference threshold Im. The current difference threshold Im is set manually, and in this example, it is preferably but not limited to being set to 5.

[0095] When the absolute value of the difference between the current actual current value I_cur and the target current value I_des is greater than the current difference threshold Im, the controller adjusts the PID parameters according to the comparison result between the current actual current value I_cur and the target current value I_des, calculates and updates the preset pulse width according to the first pulse width algorithm, and controls the power supply circuit to output the corresponding output power to the load with the preset pulse width.

[0096] Specifically, when the absolute value of the difference between the current actual current value I_cur and the target current value I_des is greater than the current difference threshold Im and the current actual current value I_cur is greater than the target current value I_des, the first pulse width algorithm is:

[0097] pwm_cur=PWM_des-ki*(PWM_des*(I_cur-_I_des) / 256) / 128, where PWM_des is the target pulse width, I_cur is the current actual current value, I_des is the target current value, and Ki is the integral gain.

[0098] For example, if the current actual current value I_cur is greater than 1.5 times the target current value I_des, the initial Ki value of the PID is adjusted to increase by b1.

[0099] If the current actual current value I_cur is greater than 1.25 times the target current value I_des and less than 1.5 times the target current value I_des, the initial value of Ki is increased by b2.

[0100] If the current actual current value I_cur is less than 1.25 times the target current value I_des but greater than 1.1 times the target current value I_des, Ki increases by b3; Ki is the integral gain, and in this embodiment, the initial value of Ki is 15, b1, b2, and b3 are all positive real numbers, and b1>b2>b3 is satisfied. For example, in the pure cut mode, b1 is 5, b2 is 3, and b3 is 2.

[0101] If the current actual current value I_cur is less than 1.1 times the target current value I_des but greater than or equal to the target current value I_des, Ki is not adjusted.

[0102] When the absolute value of the difference between the current actual current value I_cur and the target current value I_des is greater than the current difference threshold Im and the current actual current value I_cur is less than the target current value I_des, the first pulse width algorithm is: pwm_cur = α×PWM_des, α is a positive real number greater than 1. For example, in the pure cutting mode of the high-frequency electric knife, α is preferably but not limited to 1.25.

[0103] When the absolute value of the difference between the current actual current value I_cur and the target current value I_des is not greater than the current difference threshold Im, the controller compares the current actual voltage value U_cur with the target voltage value U_des. When the absolute value of the difference between the current actual voltage value U_cur and the target voltage value U_des is greater than the voltage difference threshold Um, the second pulse width algorithm is matched according to the comparison result between the current actual voltage value U_cur and the target voltage value U_des to calculate and update the preset pulse width, and the power supply circuit is controlled to output the corresponding output power to the load with the preset pulse width.

[0104] Specifically, when the absolute value of the difference between the current actual voltage value U_cur and the target voltage value U_des is greater than the voltage difference threshold Um, and the current actual voltage value U_cur is greater than the target voltage value U_des, the second pulse width algorithm is: pwm_cur = PWM_des-ki*(U-Un)*PWM_des / 256 / 128, and the preset pulse width is used to control the power supply circuit to output the corresponding output power to the load.

[0105] When the absolute value of the difference between the current actual voltage value U_cur and the target voltage value U_des is greater than the voltage difference threshold Um, and the current output voltage value U_cur is less than the target voltage value U_des, the second pulse width algorithm is: pwm_cur = PWM_des-kp*(U-Un)*PWM_des / 256 / 128, and the preset pulse width pwm_cur is used to control the power supply circuit to output the corresponding power to the load. Kp is the proportional gain of the PID algorithm. In this embodiment, its initial value is set to 60.

[0106] When the absolute value of the difference between the current actual voltage value U_cur and the target voltage value U_des is not greater than the voltage difference threshold value Um, constant power is output without adjusting the current preset pulse width pwm_cur. Figure 6 is the high-frequency electrosurgical unit output power adjustment response diagram, Figure 6 It can be seen that high frequency makes the output power of the electrosurgical knife eventually approach constant power.

[0107] In this embodiment, step S4 to step S5 is a cyclic execution process until the preset pulse width is adjusted to reach the target pulse width.

[0108] This embodiment further includes step S6: driving the power supply circuit to apply target power to the load end with the target pulse width obtained in step S5.

[0109] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0110] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An output power adaptive control system, suitable for high-power energy platforms, characterized in that: include: A signal acquisition circuit, wherein the signal acquisition circuit is used to acquire an actual voltage signal and an actual current signal of a load end; A controller, wherein a plurality of target intervals of output power are planned in the controller, and a linear relationship among pulse width, voltage value and current value respectively corresponding to the output power in each target interval is constructed; the controller obtains an actual voltage value and an actual current value at a load end, determines a target interval corresponding to the target power, calculates a corresponding target pulse width, target voltage value and target current value based on the linear relationship, sends a driving signal of a preset pulse width to a power supply circuit based on the target pulse width, the preset pulse width is smaller than the target pulse width, and adaptively controls the preset pulse width in response to the magnitude of the actual voltage value compared to the target voltage value and the magnitude of the actual current value compared to the target current value until the target pulse width is reached; A power supply circuit is connected to the controller and applies output power to the load end in response to a preset pulse width sent by the controller until a target power is reached.

2. The output power adaptive control system according to claim 1, characterized in that: The signal acquisition circuit includes a voltage acquisition circuit and a current acquisition circuit; The voltage sampling circuit is connected to the load end to collect the actual voltage signal of the load end, and the actual voltage signal is converted into an actual voltage value by the analog / digital conversion circuit and sent to the controller; The current sampling circuit is connected to the load end to collect the actual current signal of the load end. The actual current signal is converted into an actual current value by the analog / digital conversion circuit and sent to the controller.

3. The output power adaptive control system according to claim 1, characterized in that: The power supply circuit includes a main power supply and a first rectifier circuit module connected to the main power supply. The first rectifier circuit module is externally connected to the main power supply and converts an AC signal into a DC signal and transmits the DC signal to the main power supply.

4. The output power adaptive control system according to claim 3, characterized in that: The power supply circuit also includes a second rectifier circuit module and a power amplifier module; the input end of the second rectifier circuit module is connected to the output end of the main power supply to convert the DC signal output by the main power supply into an AC signal, and the output end of the second rectifier circuit module is connected to the input end of the power amplifier module, which amplifies the voltage signal and current signal output by the second rectifier circuit module and then loads them to the load end.

5. An output power adaptive control method for the output power adaptive control system according to claim 1, characterized in that: The following steps are involved: S1, planning multiple target intervals of output power, and constructing a linear relationship between the pulse width, voltage value and current value corresponding to the output power in each target interval; S2, obtaining a target power and determining a target interval corresponding to the target power, and calculating a corresponding target pulse width, a target voltage value, and a target current value based on the linear relationship; S3, setting a preset pulse width based on the target pulse width and making the preset pulse width smaller than the target pulse width, and driving the power supply circuit to apply output power to the load end with the preset pulse width; S4, obtaining the actual voltage value and the actual current value of the load end; S5, adaptively adjusting the preset pulse width by using the difference between the actual current value and the target current value, and the difference between the actual voltage value and the target voltage value, until the target pulse width is reached; S6, driving the power supply circuit with the target pulse width to apply target power to the load end.

6. The output power adaptive control method according to claim 5, characterized in that: The method for planning multiple target intervals of output power is: Test various output modes of the high-power energy platform, set the output power range of various output modes, obtain the relationship curve between the pulse width output by the controller and the output power, the relationship curve between the output power and the output current, and the relationship curve between the output power and the output voltage; Find N power points within the output power range of various output modes, where N is a positive integer, and divide the output power range of various output modes into N-1 target intervals.

7. The output power adaptive control method according to claim 5, characterized in that: The method for determining the target pulse width value, target voltage, and target current is as follows: If the target power p is in the nth target interval, 1≤n≤N-1, then its corresponding target pulse width value pwm(p) is pwm(p)=k 1n (p-p n )+pwm n , Among them, k 1n is the slope of the pulse width-power curve in interval n, p n is the power value of the initial point of interval n, pwm n is the pulse width value of the initial point of interval n; The target voltage value V(p) is V(p)=k 2n (p-p n )+V n , Among them, k 2n is the slope of the voltage-power curve in interval n, p n is the power value of the initial point of interval n, V n is the voltage value of the initial point of interval n; The target current value I(p) is I(p)=k 3n (p-p n )+I n Among them, k 3n is the slope of the current-power curve in interval n, p n is the power value of the initial point of interval n, I n is the current value at the initial point of interval n.

8. The output power adaptive control method according to claim 5, characterized in that: The method for adjusting the preset pulse width value by using the magnitude of the actual voltage value compared to the target voltage value, and the magnitude of the actual current value compared to the target current value is: If the actual current value is greater than the target current value, the preset pulse width value is reduced; If the actual current value is less than the target current value, the preset pulse width value is increased; If the actual voltage value is greater than the target voltage value, the preset pulse width value is reduced; If the actual voltage value is less than the target voltage value, the preset pulse width value is increased.

9. The method for adaptively controlling output power according to claim 5, characterized in that: There is also a pre-judgment step between steps S4 and S5: Determine whether the absolute value of the difference between the current actual current value and the target current value is greater than the current difference threshold; If yes, then executing step S5 to adjust the target pulse width by comparing the actual current value with the target current value; If not, determine whether the absolute value of the difference between the current actual voltage value and the target voltage value is greater than the voltage difference threshold. If so, execute step S5 to adjust the target pulse width according to the size of the actual voltage value compared to the target voltage value. If not, do not adjust the current pulse width.

10. The output power adaptive control method according to claim 5, characterized in that: Specifically, the preset pulse width is adjusted by using a PID control method, an adaptive control method, a predictive control method, or a fuzzy control method.

Images