CN117348399A - Output power self-adaptive adjusting system and method - Google Patents
Output power self-adaptive adjusting system and method Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
Abstract
The invention provides a self-adaptive regulating system and a self-adaptive regulating method for output power of a high-power energy platform. The system comprises: the signal acquisition circuit acquires and processes the electric signal on the power output circuit; the control module is electrically connected with the signal acquisition circuit, receives and secondarily processes the electric signals, and responds to the secondary processing result to adjust the driving frequency until reaching the resonant frequency and outputting a first driving signal and a second driving signal; the driving frequency output circuit is electrically connected with the first output end of the control module, receives the first driving signal and outputs driving frequency; the power adjusting circuit is electrically connected with the second output end of the control module and receives a second driving signal to adjust the output power until reaching the target power; the input end of the driving frequency output circuit is electrically connected with the power regulating circuit and outputs power in a periodical change mode based on the driving frequency. The invention can adaptively adjust the output power and meet the normal working requirement of a high-power energy platform.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to an output power self-adaptive adjusting system and method, which are particularly suitable for self-adaptive adjustment of the output power of a high-power energy platform.
Background
With the continuous progress of technology, many modern medical instruments have been rapidly developed, and in particular, high-power energy platforms, such as high-frequency electrotomes, large vessel anastomat, argon knife, li Pu knife, etc., which are required to be in direct contact with human bodies are required. In addition to the performance requirements of the devices themselves, the requirements of these medical devices are also becoming more and more interesting in terms of safety of the devices to the human body when they are used. These high power energy platforms therefore need to be maintained in a stable operating state.
The current power output circuits for energy platforms use a fixed switching frequency. Because the capacitor and the inductor have ageing problems, the resonant frequency of the output power circuit also changes, and when the system driving frequency and the resonant frequency are not matched, the electric knife cannot work normally, namely the actually output power can be reduced, the energy of the electric knife cannot meet the working requirement, and the cutting or coagulation effect is poor.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an output power self-adaptive adjusting system and an output power self-adaptive adjusting method, so that the driving frequency and the resonant frequency of the system are matched, and the output power is self-adaptively adjusted to meet the normal working requirement of a high-power energy platform, and even if the resonant capacitor and the resonant inductor of a power output circuit are aged, the high-power energy platform can still work normally.
In order to achieve the above object of the present invention, the present invention provides an output power adaptive adjustment system, which is suitable for a high-power energy platform, comprising:
a power output circuit including a resonant circuit for generating a resonant frequency;
the signal acquisition circuit is electrically connected with the power output circuit and is used for acquiring and processing the electric signals on the power output circuit;
the control module is electrically connected with the signal acquisition circuit and is used for receiving and secondarily processing the processed electric signals, adjusting the driving frequency until reaching the resonant frequency and outputting a first driving signal in response to the secondary processing result, and outputting a second driving signal for adjusting the output power;
the driving frequency output circuit is electrically connected with the first output end of the control module and is used for receiving the first driving signal and outputting the driving frequency;
the power adjusting circuit is electrically connected with the second output end of the control module and is used for receiving the second driving signal to adjust the output power until reaching the target power;
the input end of the driving frequency output circuit is electrically connected with the power regulating circuit and outputs the output power in a periodical change mode based on the driving frequency.
The self-adaptive output power adjusting system enables the driving frequency to be matched with the resonant frequency, and the output power is adjusted through self-adaptation, so that the normal working requirement of the high-power energy platform is met, even if the resonant capacitor and the resonant inductor of the power output circuit are aged, the high-power energy platform can still work normally, the frequency is adjusted first, the power is adjusted, and the adjusting speed and accuracy are improved.
In an alternative to the output power adaptive adjustment system, the driving frequency adjustment circuit includes:
the first signal amplifying circuit is electrically connected with the first output end of the control module and is used for receiving and amplifying the first driving signal;
the second signal amplifying circuit is electrically connected with the first output end of the control module and is used for receiving and amplifying the first driving signal;
the full-bridge inverter circuit is electrically connected with the first signal amplifying circuit, and the reverse circuit is electrically connected with the second signal amplifying circuit and is used for receiving the first driving signal and conducting the forward and reverse circuits of the full-bridge inverter circuit so as to realize the conversion of direct current into alternating current.
In the alternative scheme, the driving frequency adjusting circuit realizes the forward and reverse circuit conduction of the full-bridge inverter circuit based on the first driving signal, so that the full-bridge inverter circuit realizes the conversion from direct current to alternating current, and is convenient for providing high-voltage alternating current for a load.
In an alternative to the output power adaptive adjustment system, the signal acquisition circuit comprises:
the first voltage sensor is arranged at the input end of the resonant circuit and is used for acquiring a first voltage signal of the electric signal;
the second voltage sensor is arranged at the output end of the resonant circuit and is used for acquiring a second voltage signal of the electric signal;
the current sensor is arranged at the output end of the resonant circuit and is used for acquiring an output current signal of the electric signal;
the first voltage processing module is electrically connected with the first voltage sensor and is used for receiving the first voltage signal and converting the first voltage signal into a first voltage value;
the second voltage processing module is electrically connected with the second voltage sensor and is used for receiving the second voltage signal and converting the second voltage signal into a second voltage value;
the current processing module is electrically connected with the current sensor and is used for receiving the output current signal and converting the output current signal into an output current value;
the power processing module is electrically connected with the second voltage processing module and the current processing module and is used for receiving the second voltage value and the output current value and processing the second voltage value and the output current value to obtain an output power value;
the input end of the control module is electrically connected with the first voltage processing module, the second voltage processing module, the current processing module and the power processing module and is used for receiving the first voltage value, the second voltage value, the output current value and the output power value.
This alternative provides a circuit basis for acquiring and processing electrical signals on the power output circuit.
In an alternative of the adaptive output power adjustment system, the control module adjusts the driving frequency to match the resonant frequency of the power output circuit in response to a difference between the first voltage value and the second voltage value being greater than or equal to a first threshold;
the control module responds to the fact that the output current value does not exceed the current threshold value, the second voltage value does not exceed the voltage threshold value, and the difference value between the target power and the output power is smaller than the power threshold value, and generates a second driving signal which is output to the power processing module and used for adjusting the output power until the output power of the load end reaches the target power. This alternative further improves the speed and accuracy of the adjustment.
The invention also provides a power self-adaptive adjusting method based on the output power self-adaptive adjusting system, which comprises the following steps:
acquiring an electric signal of a power output circuit;
adjusting the driving frequency according to the electric signal until reaching the resonant frequency, outputting a first driving signal and outputting a second driving signal;
the power regulating circuit regulates the output power until reaching the target power according to the second driving signal, and the driving frequency output circuit outputs the output power to the power output circuit in a periodical change mode based on the first driving signal; the power output circuit finally outputs the target power.
The method enables the driving frequency and the resonance frequency of the system to be matched, can adaptively adjust the output power, meets the normal working requirement of the high-power energy platform, can still normally work even under the condition that the resonance capacitance and the resonance inductance of the power output circuit are aged, and adjusts the frequency first and then adjusts the power, thereby improving the adjusting speed and accuracy.
In an alternative scheme of the power self-adaptive adjusting method, the method for acquiring the electric signal of the power output circuit and adjusting the driving frequency according to the electric signal until reaching the resonant frequency comprises the following steps:
s11, acquiring a current first voltage value of an input end of a resonant circuit of the power output circuit and a current second voltage value of an output end of the resonant circuit;
and S12, the control module responds to the fact that the difference value between the current first voltage value and the current second voltage value is larger than or equal to a first threshold value, and the adjusting driving frequency is matched with the resonance frequency of the power output circuit.
When the driving frequency reaches the resonance frequency of the resonance circuit, the resonance impedance is minimum, otherwise, the resonance circuit can divide the voltage, and the larger the voltage divided by the resonance circuit is, the smaller the output voltage is, so that the matching condition of the driving frequency and the resonance frequency of the resonance circuit is reflected by the first voltage value of the input end of the resonance circuit and the second voltage value of the output end of the resonance circuit, and the matching of the driving frequency and the resonance frequency of the resonance circuit can be rapidly and accurately realized.
In an alternative of the power adaptive adjustment method, step S12 includes the steps of:
s121, if the difference value between the current first voltage value and the current second voltage value is smaller than a first threshold value, the control module judges that the driving frequency is matched with the resonance frequency of the power output circuit; otherwise, step S122 is entered;
and S122, adjusting and increasing the driving frequency until the driving frequency is matched with the resonance frequency of the power output circuit.
In an alternative to the power adaptive adjustment method, step S122 includes the steps of:
s1221: if the difference value between the current first voltage value and the current second voltage value is not smaller than the first threshold value, increasing the driving frequency, wherein the frequency adjusting amplitude is i;
s1222: judging whether the difference value between the current first voltage value and the current second voltage value is smaller than the difference value between the first voltage value and the second voltage value acquired last time, if so, re-executing the step S121; otherwise, step S1223 is entered;
s1223: reducing the driving frequency adjustment amplitude, wherein the frequency adjustment amplitude i 'is smaller than i, and assigning i' to i; judging whether the difference value between the current first voltage value and the current second voltage value is not smaller than the difference value between the previous first voltage value and the second voltage value, if so, adjusting the frequency adjustment amplitude to be i', and executing step S121; otherwise, judging whether the difference value between the current first voltage value and the current second voltage value is smaller than a first threshold value, if so, ending the driving frequency adjustment; otherwise, step S1223 is repeatedly performed.
This alternative increases the speed at which the drive frequency is matched to the resonant frequency.
In an alternative aspect of the power adaptive adjustment method, the method for generating the second driving signal for driving the power adjustment circuit according to the electrical signal includes:
s21, setting target power, determining a factory calibrated power interval in which the target power is located, calculating pulse width output by a control module corresponding to the target power, and outputting the pulse width to drive a power regulating circuit by the control module;
s22, acquiring an output current value and a current second voltage value of the output end of the resonant circuit of the power output circuit under the current pulse width in real time; determining the current output power of the output end of the resonant circuit by utilizing the current second voltage value and the output current value;
s23, the control module generates a second driving signal for driving the power regulating circuit in response to the current output current value not exceeding the current threshold value, the current second voltage value not exceeding the voltage threshold value, and the difference value between the target power and the current output power not being smaller than the power threshold value.
The alternative scheme ensures that the output current value and the second voltage value of the load end are regulated within the corresponding threshold values, and ensures the safety of the system.
Specifically, step S23 includes:
s231: judging whether the current output current value is larger than the current value corresponding to the upper limit power value of the factory calibrated power interval in which the target power is positioned and is not larger than the current threshold value, if so, reducing the output pulse width by the control module, wherein the reduction amplitude is j, and executing the step S22; otherwise, enter the voltage limiting step S232;
s232: judging whether the current second voltage value is larger than a voltage value corresponding to the upper limit power value of the factory calibrated power interval in which the target power is located and is not larger than a voltage threshold value, if so, reducing the output pulse width by the control module, wherein the reduction amplitude is j, and executing step S22; otherwise, step S233 is performed;
s233: if the current output power is larger than the target power, judging whether the difference value between the current output power and the target power is smaller than a power threshold value, if so, executing the step S22, otherwise, reducing the output pulse width by the control module, wherein the reduction amplitude is j, and executing the step S22;
if the current output power is not greater than the target power, judging whether the difference value between the target power and the current output power is smaller than a power threshold, if so, executing step S22, otherwise, increasing the output pulse width by the control module, and executing step S22 with the increasing amplitude being j.
The alternative scheme is that when the power is regulated, the current comparison is firstly carried out, then the voltage comparison is carried out, and finally the power is compared, so that the current and the voltage can be ensured not to exceed the safety range, and the safety of a human body is ensured.
The beneficial effects of the invention are as follows: according to the invention, the driving frequency is regulated according to the input voltage and the output voltage of the resonant circuit of the power output circuit so as to enable the driving frequency to be matched with the resonant frequency of the power output circuit, and the output power of the power regulating circuit is regulated through the output voltage, the output current and the output power of the resonant circuit so as to enable the final output power to meet the working requirement of a high-power energy platform; even if the resonance capacitor and resonance inductance of the power output circuit are aged, the high-power energy platform can still work normally, and the high-power energy platform is particularly suitable for high-power energy platforms such as high-frequency electric knives, large vessel anastomat, argon knives, li Pu knives and the like.
When the output power is adaptively adjusted, the frequency is adjusted first, then the power is adjusted, the adjusting speed and accuracy are improved, when the power is adjusted, the current comparison and the voltage comparison are carried out first, and finally the power is compared, so that the current and the voltage can be ensured not to exceed the safety range, and the safety of a human body is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a plot of calibration power and PWM;
fig. 3 is a schematic flow chart of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
As shown in fig. 1, the present invention provides an output power adaptive regulation system suitable for a high-power energy platform, comprising: the device comprises a control module, a signal acquisition circuit, a power output circuit, a driving frequency output circuit and a power regulation circuit.
Wherein the power output circuit comprises a resonant circuit for generating a resonant frequency; the signal acquisition circuit is electrically connected with the power output circuit and is used for acquiring and processing the electric signals on the power output circuit.
The control module is electrically connected with the signal acquisition circuit and is used for receiving and secondarily processing the electric signal processed by the signal acquisition circuit, responding to the secondary processing result, adjusting the driving frequency until reaching the resonant frequency, enabling the driving frequency to be matched with the resonant frequency of the power output circuit, outputting a first driving signal and outputting a second driving signal for adjusting the output power.
The driving frequency output circuit is electrically connected with the first output end of the control module and is used for receiving the first driving signal and outputting driving frequency. The goal of the present embodiment of adjusting the system frequency is achieved when the drive frequency matches the resonant frequency of the resonant circuit. In this embodiment, the driving frequency adjusting circuit includes a first signal amplifying circuit, a second signal amplifying circuit, and a full-bridge inverter circuit:
the first signal amplifying circuit is electrically connected with the first output end of the control module and is used for receiving and amplifying the first driving signal; the first signal amplifying circuit amplifies the first driving signal, improves the driving capability, and the output end of the first signal amplifying circuit is connected with the forward circuit of the full-bridge inverter circuit, transmits the first driving signal to the full-bridge inverter circuit and controls the forward circuit of the full-bridge inverter circuit to be conducted; the second signal amplifying circuit is electrically connected with the first output end of the control module and is used for receiving and amplifying the first driving signal; the second signal amplifying circuit amplifies the first driving signal, improves driving capability, and the output end of the second signal amplifying circuit is connected with the reversing circuit of the full-bridge inverter circuit, transmits the first driving signal to the full-bridge inverter circuit and controls the reversing circuit of the full-bridge inverter circuit to be conducted; the forward and reverse circuit conduction of the full-bridge inverter circuit is realized, and the full-bridge inverter circuit realizes direct current to alternating current.
The power adjusting circuit is electrically connected with the second output end of the control module and is used for receiving a second driving signal, and the power adjusting circuit adjusts the output power based on the second driving signal so that the output power of the load end reaches the target power. The input end of the driving frequency output circuit is electrically connected with the power regulating circuit, and outputs the output power to the power output circuit in a periodical change mode based on the driving frequency.
In this embodiment, the power conditioning circuit may be a high voltage power module, a high voltage transformer module, or other forms of power conditioning modules. Taking the high-voltage power supply module as an example, the second output end of the control module is connected with the driving end of the high-voltage power supply module, and the control module outputs a second driving signal to the high-voltage power supply module according to the electric signal to adjust the output power until reaching the target power. The power output end of the high-voltage power supply module is electrically connected with the full-bridge inverter circuit, and the high-voltage power supply module acquires a second driving signal and outputs power to the full-bridge inverter circuit according to the second driving signal. The full-bridge inverter circuit is electrically connected with the power output circuit, and outputs the output power to the power output circuit in a periodic variation based on the driving frequency. The power output circuit outputs target power, so that the output power of the load end meets the working requirement.
In this embodiment, the high-voltage power supply module may be further connected to a mains supply, to convert the mains supply into a high-voltage direct current, and the first driving signal and the second driving signal are PWM signals, and the driving frequency and the output power are adjusted by adjusting the duty ratio of PWM, that is, the pulse width. The mains supply is also connected with an auxiliary power supply, and the auxiliary power supply is used for converting the mains supply into low-voltage direct current and providing power for each module and each circuit in the system.
The electrical signal of the power output circuit obtained in this embodiment includes a first voltage signal generated at an input end of the resonant circuit, a second voltage signal and an output current signal generated at an output end of the resonant circuit, and the output power value obtained based on the second voltage value and the output current value by converting the first voltage signal, the second voltage signal and the output current signal into corresponding first voltage value, second voltage value and output current value.
The signal acquisition circuit comprises a first voltage sensor arranged at the input end of the resonant circuit and used for acquiring a first voltage signal of the electric signal; the second voltage sensor is arranged at the output end of the resonant circuit and is used for acquiring a second voltage signal of the electric signal; the current sensor is arranged at the output end of the resonant circuit and is used for acquiring an output current signal of the electric signal; the first voltage processing module is electrically connected with the first voltage sensor and is used for receiving the first voltage signal and converting the first voltage signal into a first voltage value; the second voltage processing module is electrically connected with the second voltage sensor and is used for receiving a second voltage signal and converting the second voltage signal into a second voltage value; the current processing module is electrically connected with the current sensor and is used for receiving the output current signal and converting the output current signal into an output current value; the power processing module is electrically connected with the second voltage processing module and the current processing module and is used for receiving the second voltage value and the output current value and processing the second voltage value and the output current value to obtain an output power value;
the input end of the control module is electrically connected with the first voltage processing module, the second voltage processing module, the current processing module and the power processing module and is used for receiving the first voltage value, the second voltage value, the output current value and the output power value.
The control module adjusts the driving frequency to match the resonant frequency of the power output circuit in response to the difference between the first voltage value and the second voltage value being greater than or equal to the first threshold.
The control module responds to the fact that the output current value does not exceed the current threshold value, the second voltage value does not exceed the voltage threshold value, and the difference value between the target power and the output power is smaller than the power threshold value, generates a second driving signal which is output to the power processing module and is used for adjusting the output power, so that the output power of the load end reaches the target power, and the working requirement is met.
The high-power energy platform terminated by the load in the embodiment can be a high-frequency electric knife, a large vessel anastomat, an argon knife or a epper knife, and the like, and the adopted electric signals can be impedance signals, phase difference signals and the like besides input voltage, output voltage and output current of the resonant circuit.
Example two
On the basis of the embodiment, the invention also provides an embodiment of an adaptive output power adjusting method. As shown in fig. 3, the method specifically comprises the following steps:
acquiring an electric signal of the power output circuit, adjusting the driving frequency according to the electric signal until reaching the resonant frequency, outputting a first driving signal to the driving frequency output circuit, and outputting a second driving signal to the power regulating circuit;
the power adjusting circuit adjusts output power until reaching target power according to the second driving signal, the driving frequency output circuit enables a forward circuit and a reverse circuit of a full-bridge inverter circuit of the driving frequency output circuit to be conducted based on the first driving signal, the full-bridge inverter circuit is enabled to realize direct current to alternating current, the driving frequency output circuit outputs the output power to the power output circuit in a periodical change mode based on the first driving signal, and the power output circuit finally outputs target power. The power conditioning circuit in this embodiment is preferably, but not limited to, a high voltage power supply module.
In this embodiment, an input voltage, an output current, and an output power obtained based on the output voltage and the output current of a resonant circuit of a power output circuit are taken as examples of the electric signal, and will be described in detail.
The high-frequency electric knife has a calibration operation before leaving the factory, as shown in figure 2, respectively at P 1 、P 2 、P 3 、P 4 、P 5 、P 6 、P 7 、P 8 、P 9 、P 10 The 10 power points are calibrated, and the corresponding PWM C For PWM 1 、PWM 2 、PWM 3 、PWM 4 、PWM 5 、PWM 6 、PWM 7 、PWM 8 、PWM 9 、PWM 10 The method comprises the steps of carrying out a first treatment on the surface of the Corresponding voltage U 21 、U 22 、U 23 、U 24 、U 25 、U 26 、U 27 、U 28 、U 29 、U 210 The method comprises the steps of carrying out a first treatment on the surface of the Corresponding current is I 1 、I 2 、I 3 、I 4 、I 5 、I 6 、I 7 、I 8 、I 9 、I 10 The method comprises the steps of carrying out a first treatment on the surface of the The voltage threshold is U max The current threshold is I max 。
When the system works, the control module responds to the input of any power signal, outputs a first driving signal (a first pulse signal PWM1 and a second pulse signal PWM 2) for driving the full-bridge inverter circuit to conduct forward and reverse conduction, and also outputs a second driving signal to drive the output power of the high-voltage power supply module. In this embodiment, the system can be presetIn the frequency range of the system, the safety frequency of the high-frequency electric knife is 300 KHz-750 KHz, the frequency range of the system is set to be 350 KHz-700 KHz in the embodiment, and an output power P is set n And starting the system, starting self-adaptive adjustment, and enabling the driving frequency to be matched with the resonance frequency of the power output circuit, so that the output power of the load end meets the working requirement.
The method comprises the specific steps of obtaining an electric signal of a power output circuit, adjusting a driving frequency according to the electric signal until reaching a resonant frequency:
s11, acquiring a current first voltage value U of a resonant circuit input end of the power output circuit 1n Current second voltage value U of resonant circuit output terminal 2n 。
S12, the control module responds to the current first voltage value U 1n And the current second voltage value U 2n The difference value of the first threshold value U or more k The adjustment drive frequency is matched to the resonant frequency of the power output circuit.
The specific adjusting steps are as follows:
s121, if the current first voltage value U 1n And the current second voltage value U 2n The difference value is smaller than the first threshold value U k U, i.e. U 1n -U 2n <U k The driving frequency is approximately up to the resonant frequency f0 of the power output circuit, namely the control module judges that the driving frequency is matched with the resonant frequency f0, the frequency adjustment is finished, the power adjustment stage is entered, and the power adjustment circuit adjusts the output power; otherwise, the process advances to step S122.
S122, if the current first voltage value U 1n And the current second voltage value U 2n The difference value is not smaller than the first threshold value U k When, U 1n -U 2n ≥U k When the frequency of the driving frequency is regulated by the control module, the frequency variation range does not exceed the preset system frequency range, and the frequency variation range is 350 KHz-700 KHz in the implementation until the driving frequency approximately reaches the resonant frequency f0 and is matched with the resonant frequency f 0. In the step, when the driving frequency is adjusted, the method is specifically implemented as follows:
s1221: if the current first voltage value U 1n And the current second voltage value U 2n The difference value of the first threshold value U or more k U, i.e. U 1n -U 2n ≥U k The control module increases the driving frequency, the frequency adjustment amplitude is i, i.e. the driving frequency is increased to F n +i, detecting a first voltage value U of a resonant circuit of the power output circuit after the drive frequency is changed 1n+1 Second voltage value U 2n+1 A first voltage U of a resonant circuit of the power output circuit with the driving frequency changed 1n+1 Assigned to the current first voltage value U 1n A second voltage U of the resonant circuit of the power output circuit with the driving frequency changed 2n+1 Assigned to the current second voltage value U 2n 。
S1222: if the current first voltage value U 1n And the current second voltage value U 2n The difference value of the voltage is smaller than the difference value of the first voltage value and the second voltage value obtained last time, and is based on the current first voltage value U after the frequency is increased 1n And the current second voltage value U 2n Step S121 is performed; otherwise, step S1223 is entered.
S1223: if the current first voltage value U 1n And the current second voltage value U 2n The control module reduces the driving frequency by not less than the difference between the first voltage value and the second voltage value, the reduced frequency adjustment amplitude i 'is less than i, and i' is assigned to i, i.e. the driving frequency is reduced to F n I, i.e. let i' be i/2, assigning i/2 to i, detecting the first voltage value U of the resonant circuit of the power output circuit after a change of the driving frequency 1n+1 Second voltage value U 2n+1 A first voltage U of a resonant circuit of the power output circuit with the driving frequency changed 1n+1 Assigned to the current first voltage value U 1n A second voltage U of the resonant circuit of the power output circuit with the driving frequency changed 2n+1 Assigned to the current second voltage value U 2n 。
If the current first voltage value U 1n And the current second voltage value U 2n The difference between the first voltage value and the second voltage value is not smaller than the previous one, the frequency adjustment amplitude is reduced, i.e. i/2 is reduced, and the reduced voltage is used for the voltage adjustmentThe frequency adjustment amplitude is assigned to i, and the first voltage U of the resonant circuit of the power output circuit after the driving frequency is changed is detected 1n+1 Second voltage value U 2n+1 A first voltage U of a resonant circuit of the power output circuit with the driving frequency changed 1n+1 Assigned to the current first voltage value U 1n A second voltage U of the resonant circuit of the power output circuit with the driving frequency changed 2n+1 Assigned to the current second voltage value U 2n Then, step S121 is performed.
If the current first voltage value U 1n And the current second voltage value U 2n When the difference value of the first voltage value is smaller than the difference value of the first voltage value and the second voltage value, judging the current first voltage value U 1n And the current second voltage value U 2n Whether the difference is smaller than the first threshold U k If so, the driving frequency is approximately up to the resonant frequency f0, and is matched with the resonant frequency f0, and the driving frequency adjustment is finished; otherwise, step S1223 is performed.
And finishing the frequency adjustment until the driving frequency is matched with the resonant frequency f 0.
After the frequency adjustment is completed, the power adjustment is performed, and the output current value I of the resonant circuit of the power output circuit is obtained at the moment n The control module is used for controlling the voltage according to the current second voltage value U 2n Current output current value I n And generating a second driving signal for driving the high-voltage power supply module so that the output power of the high-frequency electric knife meets the working requirement. The drive signal here is a PWM signal.
The method specifically comprises the following steps:
s21, setting target power P n Determining a target power P n The power interval of factory calibration is located, and the target power P is calculated n Pulse width PWM output by corresponding control module C The control module outputs the pulse width PWM C Driving the power conditioning circuit.
Here target power P n Pulse width PWM output by corresponding control module C The calculation method of (1) is as follows: at the target power P n Construction in a factory calibrated power intervalThe linear relation between the output power and the PWM output by the control module, and the target power P is calculated according to the linear relation n Pulse width value PWM output by the corresponding control module C PWM is carried out C PWM as the current pulse width value n The control module outputs the pulse width value PWM n And driving the high-voltage power supply module.
The calculation formula is as follows: pulse width PWM C ＝【(PWM’-PWM”)/(P’-P”)】*P n +pwm '- [ (PWM' -PWM ")/(P '-P") ] P ", wherein P' and P" are target powers P " n The upper and lower limit power values of the power interval of factory calibration are the pulse energy corresponding to the PWM ' and the PWM ' which are P '. For example, when the target power P n The power interval of factory calibration is shown as [ P ] in figure 2 3 ，P 4 P' corresponds to P when in the interval 4 P' corresponds to P 3 Find P in FIG. 2 4 And P 3 Corresponding PWM 4 And PWM 3 Then the target power P can be calculated according to the formula n Pulse width value PWM output by the corresponding control module C 。
S22, collecting the current output current value I of the output end of the resonant circuit of the power output circuit under the current pulse width in real time n And a current second voltage value U 2n The method comprises the steps of carrying out a first treatment on the surface of the By means of the current value I n And a current second voltage value U 2n The current output power of the output of the resonant circuit is determined. Here the present output current value I n Current second voltage value U 2n For the current output current value I in case of matching of the driving frequency and the resonant frequency f0 n Current second voltage value U 2n 。
S23, the control module responds to the current output current value I n Does not exceed the current threshold I max Current second voltage value U 2n Does not exceed the voltage threshold U max And target power and current output power P n ' the difference is not less than the power threshold P m A second driving signal is generated to drive the high voltage power supply module.
The step S23 specifically includes:
s231: if the current value I is currently output n Greater than I' and less than or equal to the current threshold I max The control module reduces pulse width PWM n The step S22 is performed with the decreasing amplitude j. If the current value I is currently output n Not greater than I', the voltage limiting step S232 is entered.
A proportionality constant K1 larger than 1 can be set to judge the current output current value I n Whether or not greater than K1 and less than or equal to a current threshold I max If so, the control module reduces the pulse width PWM n Step S22 is performed with the decreasing amplitude j, otherwise the voltage limiting step S232 is entered.
I' is the target power P n The current value corresponding to the upper limit power value P' of the factory calibrated power interval, such as the target power P n The power interval of factory calibration is shown as [ P ] in figure 2 3 ，P 4 In the interval, I' is power P 4 Corresponding I 4 。
S232: if the current second voltage value U 2n Greater than U' and less than or equal to voltage threshold U max The control module reduces pulse width PWM n Step S22 is executed, wherein the reduction amplitude is j; if the current second voltage value U 2n Not greater than U', step S233 is performed.
Here, a proportionality constant K2 greater than 1 may be set to determine the current second voltage value U 2n Whether or not to be greater than K2U' and less than or equal to a voltage threshold U max If so, the control module reduces the pulse width PWM n Step S22 is performed with the decreasing amplitude j, otherwise the voltage limiting step S233 is entered.
U' is the target power P n Voltage corresponding to upper limit power value P' of power interval of factory calibration, such as when target power P n The power interval of factory calibration is shown as [ P ] in figure 2 3 ，P 4 When in the interval, U' is power P 4 Corresponding U 24 。
S233: if the current output power P n ' greater than target power P n And P is n ’-P n Not less than the power threshold P m The control module reduces the pulse width PWM n Step S22 is executed, wherein the reduction amplitude is j; if the current output power P n ' greater than target power P n And P is n ’-P n Less than the power threshold P m Step S22 is performed; if the current output power P n ' not greater than the target power P n And P is n -P n ' not less than the power threshold P m The control module increases the pulse width PWM n Step S22 is executed by increasing the amplitude to j; if the current output power P n ' not greater than the target power P n And P is n -P n ' less than the power threshold P m Step S22 is performed.
Repeating the steps to make the output power of the high-frequency electric knife reach the target power P as much as possible n Always meeting the working requirements.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An output power adaptive regulation system for a high power energy platform, comprising:
a power output circuit including a resonant circuit for generating a resonant frequency;
the signal acquisition circuit is electrically connected with the power output circuit and is used for acquiring and processing the electric signals on the power output circuit;
the control module is electrically connected with the signal acquisition circuit and is used for receiving and secondarily processing the processed electric signals, adjusting the driving frequency until reaching the resonant frequency and outputting a first driving signal in response to the secondary processing result, and outputting a second driving signal for adjusting the output power;
the driving frequency output circuit is electrically connected with the first output end of the control module and is used for receiving the first driving signal and outputting the driving frequency;
the power adjusting circuit is electrically connected with the second output end of the control module and is used for receiving the second driving signal to adjust the output power until reaching the target power;
the input end of the driving frequency output circuit is electrically connected with the power regulating circuit and outputs the output power in a periodical change mode based on the driving frequency.
2. The output power adaptive regulation system of claim 1, wherein the drive frequency regulation circuit comprises:
the first signal amplifying circuit is electrically connected with the first output end of the control module and is used for receiving and amplifying the first driving signal;
the second signal amplifying circuit is electrically connected with the first output end of the control module and is used for receiving and amplifying the first driving signal;
the full-bridge inverter circuit is electrically connected with the first signal amplifying circuit, and the reverse circuit is electrically connected with the second signal amplifying circuit and is used for receiving the first driving signal and conducting the forward and reverse circuits of the full-bridge inverter circuit so as to realize the conversion of direct current into alternating current.
3. The output power adaptive regulation system of claim 1, wherein the signal acquisition circuit comprises:
the first voltage sensor is arranged at the input end of the resonant circuit and is used for acquiring a first voltage signal of the electric signal;
the second voltage sensor is arranged at the output end of the resonant circuit and is used for acquiring a second voltage signal of the electric signal;
the current sensor is arranged at the output end of the resonant circuit and is used for acquiring an output current signal of the electric signal;
the first voltage processing module is electrically connected with the first voltage sensor and is used for receiving the first voltage signal and converting the first voltage signal into a first voltage value;
the second voltage processing module is electrically connected with the second voltage sensor and is used for receiving the second voltage signal and converting the second voltage signal into a second voltage value;
the current processing module is electrically connected with the current sensor and is used for receiving the output current signal and converting the output current signal into an output current value;
the power processing module is electrically connected with the second voltage processing module and the current processing module and is used for receiving the second voltage value and the output current value and processing the second voltage value and the output current value to obtain an output power value;
the input end of the control module is electrically connected with the first voltage processing module, the second voltage processing module, the current processing module and the power processing module and is used for receiving the first voltage value, the second voltage value, the output current value and the output power value.
4. The adaptive output power regulation system of claim 3, wherein,
the control module responds to the fact that the difference value between the first voltage value and the second voltage value is larger than or equal to a first threshold value, and adjusts the driving frequency to be matched with the resonance frequency of the power output circuit;
the control module responds to the fact that the output current value does not exceed the current threshold value, the second voltage value does not exceed the voltage threshold value, and the difference value between the target power and the output power is smaller than the power threshold value, and generates a second driving signal which is output to the power processing module and used for adjusting the output power until the output power of the load end reaches the target power.
5. A power adaptation method based on an output power adaptation system according to any of claims 1-4, comprising the steps of:
acquiring an electric signal of a power output circuit;
adjusting the driving frequency according to the electric signal until reaching the resonant frequency, outputting a first driving signal and outputting a second driving signal;
the power regulating circuit regulates the output power until reaching the target power according to the second driving signal, and the driving frequency output circuit outputs the output power to the power output circuit in a periodical change mode based on the first driving signal; the power output circuit finally outputs the target power.
6. The method for adaptively adjusting power according to claim 5, wherein the method for obtaining an electrical signal of the power output circuit and adjusting the driving frequency according to the electrical signal until the resonant frequency is reached comprises:
s11, acquiring a current first voltage value of an input end of a resonant circuit of the power output circuit and a current second voltage value of an output end of the resonant circuit;
and S12, the control module responds to the fact that the difference value between the current first voltage value and the current second voltage value is larger than or equal to a first threshold value, and the adjusting driving frequency is matched with the resonance frequency of the power output circuit.
7. The power adaptive adjustment method according to claim 6, characterized in that step S12 comprises the steps of:
s121, if the difference value between the current first voltage value and the current second voltage value is smaller than a first threshold value, the control module judges that the driving frequency is matched with the resonance frequency of the power output circuit; otherwise, step S122 is entered;
and S122, adjusting and increasing the driving frequency until the driving frequency is matched with the resonance frequency of the power output circuit.
8. The power adaptive adjustment method according to claim 7, characterized in that step S122 includes the steps of:
s1221: if the difference value between the current first voltage value and the current second voltage value is not smaller than the first threshold value, increasing the driving frequency, wherein the frequency adjusting amplitude is i;
s1222: judging whether the difference value between the current first voltage value and the current second voltage value is smaller than the difference value between the first voltage value and the second voltage value acquired last time, if so, re-executing the step S121; otherwise, step S1223 is entered;
s1223: reducing the driving frequency adjustment amplitude, wherein the frequency adjustment amplitude i 'is smaller than i, and assigning i' to i; judging whether the difference value between the current first voltage value and the current second voltage value is not smaller than the difference value between the previous first voltage value and the second voltage value, if so, adjusting the frequency adjustment amplitude to be i', and executing step S121; otherwise, judging whether the difference value between the current first voltage value and the current second voltage value is smaller than a first threshold value, if so, ending the driving frequency adjustment; otherwise, step S1223 is repeatedly performed.
9. The method of claim 5, wherein generating a second driving signal for driving the power conditioning circuit based on the electrical signal comprises:
s21, setting target power, determining a factory calibrated power interval in which the target power is located, calculating pulse width output by a control module corresponding to the target power, and outputting the pulse width to drive a power regulating circuit by the control module;
s22, acquiring an output current value and a current second voltage value of the output end of the resonant circuit of the power output circuit under the current pulse width in real time; determining the current output power of the output end of the resonant circuit by utilizing the current second voltage value and the output current value;
s23, the control module generates a second driving signal for driving the power regulating circuit in response to the current output current value not exceeding the current threshold value, the current second voltage value not exceeding the voltage threshold value, and the difference value between the target power and the current output power not being smaller than the power threshold value.
10. The power adaptive adjustment method according to claim 9, characterized in that step S23 includes:
s231: judging whether the current output current value is larger than the current value corresponding to the upper limit power value of the factory calibrated power interval in which the target power is positioned and is not larger than the current threshold value, if so, reducing the output pulse width by the control module, wherein the reduction amplitude is j, and executing the step S22; otherwise, enter the voltage limiting step S232;
s232: judging whether the current second voltage value is larger than a voltage value corresponding to the upper limit power value of the factory calibrated power interval in which the target power is located and is not larger than a voltage threshold value, if so, reducing the output pulse width by the control module, wherein the reduction amplitude is j, and executing step S22; otherwise, step S233 is performed;
s233: if the current output power is larger than the target power, judging whether the difference value between the current output power and the target power is smaller than a power threshold value, if so, executing the step S22, otherwise, reducing the output pulse width by the control module, wherein the reduction amplitude is j, and executing the step S22;
if the current output power is not greater than the target power, judging whether the difference value between the target power and the current output power is smaller than the power threshold, if so, executing step S22, otherwise, increasing the output pulse width by the control module, and executing step S22 with the increasing amplitude being j.
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