CN111384945A - Frequency control method and device and frequency control circuit - Google Patents
Frequency control method and device and frequency control circuit Download PDFInfo
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- CN111384945A CN111384945A CN201811637850.7A CN201811637850A CN111384945A CN 111384945 A CN111384945 A CN 111384945A CN 201811637850 A CN201811637850 A CN 201811637850A CN 111384945 A CN111384945 A CN 111384945A
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L5/00—Automatic control of voltage, current, or power
- H03L5/02—Automatic control of voltage, current, or power of power
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- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
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Abstract
The invention relates to a frequency control method, a device and a frequency control circuit, which are used for acquiring a first power ratio corresponding to an excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusting the frequency of the excitation signal so as to enable the second power ratio to be smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
Description
Technical Field
The invention relates to the technical field of ultrasonic transducers, in particular to a frequency control method, a frequency control device and a frequency control circuit.
Background
An ultrasonic transducer is an energy conversion device that can convert input electric power into mechanical power (i.e., ultrasonic waves) and transmit the mechanical power. Ultrasonic transducers are widely used in various ultrasonic devices such as ultrasonic scalpels, ultrasonic welding machines, ultrasonic cleaning machines, and the like. An ultrasonic transducer in the ultrasonic device receives an alternating current excitation signal with a specific frequency and converts the alternating current excitation signal into mechanical energy to drive corresponding working equipment.
The ultrasonic transducer has a fixed frequency, and when the frequency of the excitation signal is consistent with the natural frequency of the ultrasonic transducer, namely the ultrasonic transducer works at a resonant frequency with consistent voltage and current phases, the conversion efficiency of the ultrasonic transducer is highest. However, in the working process of the ultrasonic transducer, the natural frequency of the ultrasonic transducer is affected by the self-performance, the state of the working equipment, the working environment and other factors, so that the natural frequency and the frequency of the excitation signal have a large difference, and the conversion efficiency of the ultrasonic transducer is reduced.
Disclosure of Invention
Therefore, it is necessary to provide a frequency control method, a frequency control device, and a frequency control circuit for solving the problem that the natural frequency of the ultrasonic transducer is changed due to the influence of the self-performance, the state of the working equipment, the working environment, and other factors during the working process, so that the natural frequency and the frequency of the excitation signal have a large difference, and the conversion efficiency of the ultrasonic transducer is reduced.
An embodiment of the present invention provides a frequency control method, including:
acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
the frequency of the excitation signal is adjusted such that the second power ratio is less than the first power ratio.
The frequency control method obtains a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
In one embodiment, the process of adjusting the frequency of the excitation signal such that the second power ratio is less than the first power ratio comprises the steps of:
if the second power ratio is smaller than the first power ratio, adjusting the frequency of the excitation signal in a first preset mode; the first preset mode is the same as the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
In one embodiment, the process of adjusting the frequency of the excitation signal such that the second power ratio is less than the first power ratio comprises the steps of:
if the second power ratio is larger than the first power ratio, adjusting the frequency of the excitation signal in a second preset mode; the second preset mode is opposite to the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
In one embodiment, the manner in which the second power ratio is adjusted relative to the frequency of the excitation signal includes increasing the frequency of the excitation signal by a preset hertz value.
In one embodiment, the manner in which the second power ratio is adjusted relative to the frequency of the corresponding excitation signal includes decreasing the frequency of the excitation signal by a preset hertz value.
An aspect of an embodiment of the present invention further provides a frequency control apparatus, including:
the first power ratio acquisition module is used for acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
the second power ratio acquisition module is used for acquiring a corresponding power ratio after the frequency of the excitation signal is adjusted, and the corresponding power ratio is used as a second power ratio;
and the frequency control module is used for adjusting the frequency of the excitation signal so as to enable the second power ratio to be smaller than the first power ratio.
The frequency control device acquires a first power ratio corresponding to the excitation signal and a second power ratio obtained by adjusting the frequency of the excitation signal, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
An aspect of the embodiments of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the following steps when executing the computer program:
acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
the frequency of the excitation signal is adjusted such that the second power ratio is less than the first power ratio.
The computer device obtains a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
An aspect of the embodiments of the present invention further provides a computer storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of:
acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
the frequency of the excitation signal is adjusted such that the second power ratio is less than the first power ratio.
The computer storage medium obtains a first power ratio corresponding to the excitation signal and a second power ratio obtained after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
In another aspect, an embodiment of the present invention provides a frequency control circuit, including a power acquisition module and a frequency control module;
the power acquisition module is used for connecting the ultrasonic transducer, acquiring active power and reactive power of the ultrasonic transducer and outputting the active power and the reactive power to the frequency control module;
the frequency control module is used for acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
the frequency control module is used for acquiring a corresponding power ratio after the frequency of the excitation signal is adjusted, and the corresponding power ratio is used as a second power ratio;
the frequency control module is further configured to adjust the frequency of the excitation signal such that the second power ratio is less than the first power ratio.
In the frequency control circuit, the frequency control module receives the active power and the reactive power of the ultrasonic transducer acquired by the power acquisition module to acquire a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal to make the second power ratio smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
The embodiment of the invention also provides an ultrasonic transducer system, which comprises a rectifying circuit, a BUCK circuit, a full-bridge inverter circuit, a high-frequency transformer, an inductance tuning matching circuit, an ultrasonic transducer and the frequency control circuit;
the system comprises a rectification circuit, a BUCK circuit, a full-bridge inverter circuit, a high-frequency transformer, an inductance tuning matching circuit and an ultrasonic transducer; the rectifying circuit is used for connecting external power supply;
the power acquisition module is connected with the ultrasonic transducer;
the frequency control module is connected with the full-bridge inverter and used for outputting control signals by the full-bridge inverter so as to adjust the frequency of alternating current signals output by the full-bridge inverter.
In the ultrasonic transducer system, the frequency control module receives the active power and the reactive power of the ultrasonic transducer acquired by the power acquisition module to acquire a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal to make the second power ratio smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
Drawings
FIG. 1 is a flow chart of a frequency control method according to an embodiment;
FIG. 2 is a flow chart of a frequency control method according to another embodiment;
FIG. 3 is a flow chart of a frequency control method according to yet another embodiment;
FIG. 4 is a block diagram of a frequency control device according to an embodiment;
FIG. 5 is a block diagram of a frequency control device according to another embodiment;
FIG. 6 is a block diagram of a frequency control circuit;
FIG. 7 is a block diagram of an ultrasound transducer system;
fig. 8 is a flowchart of a frequency control method according to an embodiment.
Detailed Description
For better understanding of the objects, technical solutions and effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples. It is to be noted that the following examples are given for the purpose of illustration only and are not intended to limit the invention
An embodiment of the present invention provides a frequency control method, in one aspect:
fig. 1 is a flowchart of a frequency control method according to an embodiment, and as shown in fig. 1, the frequency control method according to an embodiment includes steps S100 to S102:
s100, acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
when the ultrasonic transducer receives an excitation signal, the electric power of the excitation signal can be converted into mechanical power, and the active power and the reactive power of the ultrasonic transducer can be collected in the conversion process. The excitation signal is an alternating current signal having a specific frequency.
S101, acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
and acquiring the power ratio of the ultrasonic transducer when the received excitation signal with the adjusted frequency is used as the second power ratio once the frequency of the excitation signal is adjusted at any time or in any mode.
S102, adjusting the frequency of the excitation signal to enable the second power ratio to be smaller than the first power ratio.
The frequency of the excitation signal is adjusted such that the second power ratio is less than the first power ratio. After the frequency of the excitation signal is adjusted, the power ratio corresponding to the excitation signal before adjustment is a first power ratio, and the power ratio corresponding to the excitation signal after adjustment is a second power ratio. Based on this, the second power ratio in any cycle is made smaller than the first power ratio by the cyclic adjustment of the frequency of the excitation signal. The power ratio of the ultrasonic transducer can be gradually reduced through continuous cycle adjustment.
In one embodiment, the manner in which the second power ratio is adjusted relative to the frequency of the excitation signal includes increasing the frequency of the excitation signal by a preset hertz value.
I.e. the way the frequency of the excitation signal is adjusted in step S101 comprises increasing the frequency of the excitation signal by a preset hertz value. The frequency of the excitation signal with the preset hertz value is increased, taking the frequency of the excitation signal before adjustment as f as an example, and the frequency of the excitation signal after adjustment is f + Δ f, wherein Δ f is the preset hertz value. The adjustment amplitude of the frequency of the excitation signal may be set according to the setting of the preset hertz value.
In one embodiment, the manner in which the second power ratio is adjusted relative to the frequency of the corresponding excitation signal includes decreasing the frequency of the excitation signal by a preset hertz value.
I.e. the way the frequency of the excitation signal is adjusted in step S101 comprises increasing the frequency of the excitation signal by a preset hertz value. The frequency of the excitation signal with the preset hertz value is reduced, taking the frequency of the excitation signal before adjustment as f as an example, and the frequency of the excitation signal after adjustment is f- Δ f, wherein Δ f is the preset hertz value. The adjustment amplitude of the frequency of the excitation signal may be set according to the setting of the preset hertz value.
In one embodiment, fig. 2 is a flowchart of a frequency control method according to another embodiment, and as shown in fig. 2, the process of adjusting the frequency of the excitation signal in step S102 to make the second power ratio smaller than the first power ratio includes step S200:
s200, if the second power ratio is smaller than the first power ratio, adjusting the frequency of the excitation signal in a first preset mode; the first preset mode is the same as the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
Here, when the second power ratio is smaller than the first power ratio, it indicates that the frequency of the excitation signal is adjusted in a manner that the power ratio of the ultrasonic transducer becomes smaller in step S101, so that the frequency of the excitation signal is adjusted again in the same first preset manner so that the power ratio of the ultrasonic transducer becomes smaller. After the frequency of the excitation signal is adjusted by the first preset mode of step S102, step S100 and step S101 are restarted, the original second power ratio is equivalent to the current first power ratio, a new second power ratio after change is obtained, and the comparison of step S101 and the processing of step S102 are performed again to make the power ratio of the ultrasonic transducer approach to the minimum value.
The first preset mode is the same as the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted. Taking the way that the frequency of the excitation signal corresponding to the second power ratio is adjusted to be the way of reducing the frequency of the excitation signal with the preset hertz value as an example, the first preset way is to reduce the frequency of the excitation signal with the preset hertz value. Similarly, if the manner in which the second power ratio is adjusted to the frequency of the excitation signal is to increase the frequency of the excitation signal with the preset hertz value, the first preset manner is to increase the frequency of the excitation signal with the preset hertz value.
In one embodiment, fig. 3 is a flowchart of a frequency control method according to yet another embodiment, and as shown in fig. 3, the process of adjusting the frequency of the excitation signal in step S102 to make the second power ratio smaller than the first power ratio includes step S300:
s300, if the second power ratio is larger than the first power ratio, adjusting the frequency of the excitation signal in a second preset mode; the second preset mode is opposite to the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
Wherein, when the second power ratio is larger than the first power ratio, it indicates that the frequency of the excitation signal is adjusted in a manner that the power ratio of the ultrasonic transducer is increased in step S101, so that the frequency of the excitation signal is adjusted in an opposite second preset manner to make the power ratio of the ultrasonic transducer smaller. After the frequency of the excitation signal is adjusted by the second preset mode of step S102, step S100 and step S101 are restarted, the original second power ratio is equivalent to the current first power ratio, a new second power ratio after change is obtained, and the comparison of step S101 and the processing of step S102 are performed again to make the power ratio of the ultrasonic transducer approach to the minimum value.
The second preset mode is opposite to the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted. Taking the way that the second power ratio is adjusted according to the frequency of the excitation signal as an example to decrease the frequency of the excitation signal with the preset hertz value, the second preset way is to increase the frequency of the excitation signal with the preset hertz value. Similarly, if the manner in which the second power ratio is adjusted to the frequency of the stress excitation signal is to increase the frequency of the excitation signal with the preset hertz value, the second preset manner is to decrease the frequency of the excitation signal with the preset hertz value.
In the frequency control method according to any of the embodiments, the first power ratio corresponding to the excitation signal and the second power ratio obtained after the frequency of the excitation signal is adjusted are obtained, and the frequency of the excitation signal is further adjusted so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
An embodiment of the present invention provides a frequency control apparatus:
fig. 4 is a block diagram of a frequency control apparatus according to an embodiment, and as shown in fig. 4, the frequency control apparatus includes blocks 100 to 102:
a first power ratio acquisition module 100, configured to acquire a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
a second power ratio acquisition module 101, configured to acquire a power ratio corresponding to the adjusted frequency of the excitation signal, as a second power ratio;
and the frequency control module 102 is configured to adjust the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio.
In one embodiment, fig. 5 is a block diagram of a frequency control device according to another embodiment, and as shown in fig. 5, the frequency control module 102 includes a first adjusting module 200;
a first adjusting module 200, configured to adjust a frequency of the excitation signal in a first preset manner when the second power ratio is smaller than the first power ratio; the first preset mode is the same as the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
In one embodiment, as shown in fig. 5, the frequency control module 102 includes a second adjustment module 201;
a second adjusting module 201, configured to adjust the frequency of the excitation signal in a second preset manner when the second power ratio is greater than the first power ratio; the second preset mode is opposite to the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
In one embodiment, the manner in which the second power ratio is adjusted relative to the frequency of the excitation signal includes increasing the frequency of the excitation signal by a preset hertz value.
In one embodiment, the manner in which the second power ratio is adjusted relative to the frequency of the corresponding excitation signal includes decreasing the frequency of the excitation signal by a preset hertz value.
The frequency control device acquires a first power ratio corresponding to the excitation signal and a second power ratio obtained by adjusting the frequency of the excitation signal, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
An aspect of the embodiments of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the frequency control method according to any of the above embodiments are implemented.
It will be understood by those skilled in the art that all or part of the processes in the methods of the embodiments described above may be implemented by hardware related to instructions of a computer program, and the program may be stored in a non-volatile computer readable storage medium, and in the embodiments of the present invention, the program may be stored in a storage medium of a computer system and executed by at least one processor in the computer system, so as to implement the processes of the embodiments including the frequency control methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The computer device obtains a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
Based on the above examples, an aspect of the embodiments of the present invention further provides a computer storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the steps of the frequency control method of any of the above embodiments.
The integrated unit of the present invention may also be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a RAM, a ROM, a magnetic or optical disk, or various other media that can store program code.
The computer storage medium obtains a first power ratio corresponding to the excitation signal and a second power ratio obtained after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
Another aspect of the embodiments of the present invention provides a frequency control circuit:
fig. 6 is a block diagram of a frequency control circuit, and as shown in fig. 6, the frequency control circuit includes a power collection module 300 and a frequency control module 301;
the power acquisition module 300 is used for connecting the ultrasonic transducer, acquiring active power and reactive power of the ultrasonic transducer, and outputting the active power and the reactive power to the frequency control module 301;
the frequency control module 301 is configured to obtain a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
the frequency control module 301 is configured to obtain a power ratio corresponding to the adjusted frequency of the excitation signal, as a second power ratio;
the frequency control module 301 is further configured to adjust the frequency of the excitation signal such that the second power ratio is less than the first power ratio.
Based on the above example, the frequency control module 301, as a computer device, may perform the steps of the frequency control method of any of the above embodiments. The frequency control module 301 adjusts the frequency of the variable excitation signal, and externally displays the variable excitation signal as modulation of the control signal. The frequency of the excitation signal is adjusted by modulating a frequency-variable control signal. In one embodiment, the frequency control module 301 comprises an MCU, and the control signal comprises a PWM signal, and the MCU can modulate the frequency of the PWM signal. Frequency control is realized through the MCU, and cost can be effectively reduced.
In the frequency control circuit, the frequency control module 301 receives the active power and the reactive power of the ultrasonic transducer acquired by the power acquisition module 300 to obtain a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
Based on the frequency control circuit, another aspect of the embodiments of the present invention further provides an ultrasonic transducer system:
fig. 7 is a block diagram of an ultrasonic transducer system, as shown in fig. 7, the ultrasonic transducer system includes a rectifier circuit 400, a BUCK circuit 401, a full bridge inverter circuit 402, a high frequency transformer 403, an inductance tuning matching circuit 404, an ultrasonic transducer 405, and the frequency control circuit 406;
a rectifying circuit 400, a BUCK circuit 401, a full-bridge inverter circuit 402, a high-frequency transformer 403, an inductance tuning matching circuit 404 and an ultrasonic transducer 405; the rectifying circuit 400 is used for connecting external power supply;
wherein the external power supply is the original signal of the excitation signal source. The excitation signal source comprises a BUCK circuit 401, a full-bridge inverter circuit 402, a high-frequency transformer 403 and an inductance tuning matching circuit 404.
The power acquisition module 300 is connected with an ultrasonic transducer 405;
the frequency control module 301 is connected to the full-bridge inverter circuit 402, and the frequency control module 301 is configured to output a control signal from the full-bridge inverter circuit 402 to adjust the frequency of the ac signal output by the full-bridge inverter circuit 402.
In order to further understand the embodiment of the present invention by combining the frequency control method of any of the above embodiments, the following takes the specific application example shown in fig. 8 as an example to explain the technical solution of the embodiment of the present invention:
fig. 8 is a flowchart of a frequency control method of a specific application example, and as shown in fig. 8, a program of the frequency control method of the specific application example preset an initial frequency f, and adjusts the initial frequency f in a first preset manner, where the first preset manner is denoted as "direction d is left", and correspondingly, the second preset manner is denoted as "d is right". And taking the initial frequency f as the frequency of the excitation signal, acquiring a corresponding first power ratio theta, adjusting the frequency of the excitation signal in a first preset mode, namely, in a mode of reducing the frequency of the excitation signal with a preset Hertz value, and acquiring a second power ratio theta _1 after the frequency of the excitation signal is adjusted. When the second power ratio theta _1 is smaller than the first power ratio theta, the frequency of the excitation signal is adjusted in a first predetermined manner. When the second power ratio theta _1 is greater than the first power ratio theta, the frequency of the excitation signal is adjusted in a second predetermined manner. The frequency of the excitation signal is adjusted by adjusting the frequency of the full-bridge inverter circuit 402 using the adjusted frequency as the frequency of the excitation signal.
In the ultrasonic transducer system, the frequency control module 301 receives the active power and the reactive power of the ultrasonic transducer acquired by the power acquisition module 300 to obtain a first power ratio corresponding to the excitation signal and a second power ratio after the frequency of the excitation signal is adjusted, and further adjusts the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio. By continuously adjusting the frequency of the excitation signal, the power ratio of the ultrasonic transducer can be reduced. Since the current-voltage phase difference of the excitation signal is similar to the power ratio of the ultrasonic transducer, the current-voltage phase difference of the excitation signal can be made small. Therefore, the difference between the natural frequency of the ultrasonic transducer and the frequency of the excitation signal is reduced, and the conversion efficiency of the ultrasonic transducer is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of frequency control, comprising the steps of:
acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
adjusting a frequency of the excitation signal such that the second power ratio is less than the first power ratio.
2. A frequency control method according to claim 1, wherein said process of adjusting the frequency of said excitation signal so that said second power ratio is smaller than said first power ratio comprises the steps of:
if the second power ratio is smaller than the first power ratio, adjusting the frequency of the excitation signal in a first preset mode; the first preset mode is the same as the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
3. The frequency control method according to claim 1, wherein the process of adjusting the frequency of the excitation signal so that the second power ratio is smaller than the first power ratio comprises the steps of:
if the second power ratio is larger than the first power ratio, adjusting the frequency of the excitation signal in a second preset mode; wherein the second preset mode is opposite to the mode that the frequency of the excitation signal corresponding to the second power ratio is adjusted.
4. The method according to any one of claims 1 to 3, wherein the manner in which the second power ratio is adjusted with respect to the frequency of the excitation signal includes increasing the frequency of the excitation signal by a preset Hertz value.
5. The method according to any one of claims 1 to 3, wherein the manner in which the second power ratio is adjusted with respect to the frequency of the excitation signal includes decreasing the frequency of the excitation signal by a preset Hertz value.
6. A frequency control apparatus, comprising:
the first power ratio acquisition module is used for acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
the second power ratio acquisition module is used for acquiring a corresponding power ratio after the frequency of the excitation signal is adjusted, and the corresponding power ratio is used as a second power ratio;
and the frequency control module is used for adjusting the frequency of the excitation signal so as to enable the second power ratio to be smaller than the first power ratio.
7. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps when executing the computer program:
acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
adjusting a frequency of the excitation signal such that the second power ratio is less than the first power ratio.
8. A computer storage medium, having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
adjusting a frequency of the excitation signal such that the second power ratio is less than the first power ratio.
9. A frequency control circuit is characterized by comprising a power acquisition module and a frequency control module;
the power acquisition module is used for being connected with an ultrasonic transducer, acquiring active power and reactive power of the ultrasonic transducer and outputting the active power and the reactive power to the frequency control module;
the frequency control module is used for acquiring a power ratio corresponding to the excitation signal as a first power ratio; the power ratio is the ratio of reactive power to active power when the ultrasonic transducer receives an excitation signal;
the frequency control module is used for acquiring a power ratio corresponding to the adjusted frequency of the excitation signal as a second power ratio;
the frequency control module is further configured to adjust a frequency of the excitation signal such that the second power ratio is less than the first power ratio.
10. An ultrasonic transducer system comprising a rectifier circuit, a BUCK circuit, a full bridge inverter circuit, a high frequency transformer, an inductance tuning matching circuit, an ultrasonic transducer, and the frequency control circuit of claim 9;
the rectification circuit, the BUCK circuit, the full-bridge inverter circuit, the high-frequency transformer, the inductance tuning matching circuit and the ultrasonic transducer; the rectifying circuit is used for connecting external power supply;
the power acquisition module is connected with the ultrasonic transducer;
the frequency control module is connected with the full-bridge inverter and used for outputting control signals by the full-bridge inverter so as to adjust the frequency of alternating current signals output by the full-bridge inverter.
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