CN115566813A - Magnetic coupling resonant wireless energy transmission device and method - Google Patents

Magnetic coupling resonant wireless energy transmission device and method Download PDF

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Publication number
CN115566813A
CN115566813A CN202211179241.8A CN202211179241A CN115566813A CN 115566813 A CN115566813 A CN 115566813A CN 202211179241 A CN202211179241 A CN 202211179241A CN 115566813 A CN115566813 A CN 115566813A
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ultrasonic vibrator
frequency
primary
resonance circuit
coil
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刘跃财
乔先鹏
王富全
陈威
杨兴
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Shenzhen Meifei Precision Co ltd
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Shenzhen Meifei Precision Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/15—Circuit arrangements or systems for wireless supply or distribution of electric power using ultrasonic waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

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  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

The invention discloses a magnetic coupling resonant wireless energy transmission device and a method, wherein the magnetic coupling resonant wireless energy transmission device comprises the following steps: the ultrasonic transducer comprises an excitation voltage source, a primary resonance circuit, a secondary resonance circuit and an ultrasonic vibrator; the primary resonant circuit is connected with the excitation voltage source, and the frequency of the primary resonant circuit is the same as the frequency of a loop of the excitation voltage source; the secondary resonance circuit is respectively connected with the primary resonance circuit and the ultrasonic vibrator, and the frequency of the whole secondary resonance circuit and the ultrasonic vibrator is the same as that of the excitation voltage source. The secondary resonance circuit and the whole loop of the ultrasonic vibrator generate resonance, so that the energy transmission efficiency is improved, energy transmission is carried out in a resonance mode, and the transmission distance is long.

Description

Magnetic coupling resonant wireless energy transmission device and method
Technical Field
The invention relates to the technical field of power electronics, in particular to a magnetic coupling resonant wireless energy transmission device and a magnetic coupling resonant wireless energy transmission method.
Background
At present, advanced composite materials and fine ceramic materials are widely applied to the fields of civil use, aerospace and the like due to the characteristics of excellent physical chemistry, high hardness, high strength and the like, but the advanced composite materials and the fine ceramic materials also provide a challenge on how to process the materials with high efficiency and high quality.
In a rotary ultrasonic machine, the rotary ultrasonic machining can be realized by a contact energy transmission technology or a non-contact energy transmission technology based on wireless energy transmission, wherein the contact energy transmission technology is typically a carbon brush slip ring, and the carbon brush slip ring transmits electric energy to the rotating slip ring under a certain pressure by using a non-rotating (static) carbon brush. However, this energy transmission has a limited service life and also limits the rotational speed of the slip ring.
The non-contact energy transmission technology based on wireless energy transmission can well overcome the defects of the contact energy transmission technology. The magnetic coupling induction type wireless energy transmission technology is similar to the structure of a loose coupling transformer, a traditional transformer is divided into two halves (a primary coil and a secondary coil), the primary coil generates an alternating magnetic field under the action of alternating current, the secondary coil generates alternating current under the action of the alternating magnetic field, and therefore energy can be transmitted under an air gap. However, the magnetic coupling induction type wireless energy transmission technology has short transmission distance and low transmission efficiency.
Accordingly, there is a need for improvements and developments in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a magnetic coupling resonant wireless energy transmission device and method, so as to solve the problems of short transmission distance and low transmission efficiency of magnetic coupling induction wireless energy in rotational ultrasonic machining.
The technical scheme of the invention is as follows:
a magnetic coupling resonant wireless energy transmission device comprises: the ultrasonic transducer comprises an excitation voltage source, a primary resonance circuit, a secondary resonance circuit and an ultrasonic vibrator;
the primary resonance circuit is connected with the excitation voltage source, and the frequency of the primary resonance circuit is the same as that of the excitation voltage source;
the secondary resonance circuit is respectively connected with the primary resonance circuit and the ultrasonic vibrator, and the frequency of the whole secondary resonance circuit and the ultrasonic vibrator is the same as that of the excitation voltage source.
In a further arrangement of the invention, the primary resonant circuit comprises: a first resistor, a first capacitor, a primary coil;
one end of the first capacitor is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the primary coil, the other end of the primary coil is connected with one end of the excitation voltage source, and the other end of the excitation voltage source is connected with the other end of the first capacitor.
In a further arrangement of the invention, the secondary resonant circuit comprises: the second resistor, the second capacitor, the secondary coil and the first inductor;
one end of the second resistor is connected with one end of the second capacitor, the other end of the second capacitor is connected with one end of the first inductor, the other end of the first inductor is connected with one end of the ultrasonic vibrator, the other end of the ultrasonic vibrator is connected with one end of the secondary coil, and the other end of the secondary coil is connected with the other end of the second resistor.
In a further arrangement of the invention, the secondary resonant circuit comprises: a second resistor, a secondary coil;
one end of the second resistor is connected with one end of the ultrasonic vibrator, the other end of the ultrasonic vibrator is connected with one end of the secondary coil, and the other end of the secondary coil is connected with the other end of the second resistor.
According to a further development of the invention, the distance between the primary coil and the secondary coil is greater than 1mm.
In a further development of the invention, the diameter of the primary coil is greater than the diameter of the secondary coil.
A magnetic coupling resonant wireless energy transmission method comprises the following steps:
determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the secondary resonance circuit and the ultrasonic vibrator;
and selecting parameters of a primary resonance circuit to enable the frequency of the primary resonance circuit to be the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator.
And adjusting the frequency of the excitation voltage source so that the frequency of the excitation voltage source is the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator.
In a further aspect of the present invention, the step of determining the frequency of the secondary resonant circuit and the entire ultrasonic transducer based on the parameters of the secondary resonant circuit and the ultrasonic transducer includes:
and determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the ultrasonic vibrator, the inductance value of the secondary coil, the inductance value of the first inductor and the capacitance value of the second capacitor.
The present invention further provides that the step of determining the frequency of the secondary resonant circuit and the entire ultrasonic vibrator according to the parameters of the secondary resonant circuit and the ultrasonic vibrator includes:
and determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the ultrasonic vibrator and the parameters of the secondary coil.
The invention further provides that the step of selecting the parameters of the primary resonance circuit to make the frequency of the primary resonance circuit the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator comprises the following steps:
and selecting the diameter of the secondary coil, and calculating the optimal solution of the diameter of the primary coil according to electromagnetic simulation under the condition that the diameter of the secondary coil is constant.
The invention provides a magnetic coupling resonant wireless energy transmission device and a method, comprising the following steps: the ultrasonic transducer comprises an excitation voltage source, a primary resonance circuit, a secondary resonance circuit and an ultrasonic vibrator; the primary resonant circuit is connected with the excitation voltage source, and the frequency of the primary resonant circuit is the same as that of the excitation voltage source; the secondary resonance circuit is respectively connected with the primary resonance circuit and the ultrasonic vibrator, and the frequency of the whole secondary resonance circuit and the ultrasonic vibrator is the same as the frequency of the excitation voltage source. According to the invention, the frequency of the primary resonant circuit is the same as that of the excitation voltage source, and the frequency of the secondary resonant circuit and the whole ultrasonic vibrator is the same as that of the excitation voltage source, so that the secondary resonant circuit and the whole loop of the ultrasonic vibrator resonate, the maximum amplitude is obtained, and the energy transmission efficiency is improved. And energy is transmitted in a resonance mode, and the transmission distance is long.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of a magnetic coupling resonant wireless energy transmission device according to the present invention.
Fig. 2 is a schematic structural diagram of the magnetic coupling resonant wireless energy transmission device of the present invention.
Fig. 3 is a structural diagram of a primary coil and a secondary coil in a magnetic coupling induction type wireless energy transmission device in the prior art.
Fig. 4 is a structural diagram of a primary coil and a secondary coil in the magnetic coupling resonant wireless energy transmission device of the present invention.
Fig. 5 is a diagram showing a positional relationship between a primary coil and a secondary coil in the magnetic coupling resonant wireless energy transmission device of the present invention.
Fig. 6 is a schematic circuit diagram of a first embodiment of the magnetic coupling resonant wireless energy transmission device according to the present invention.
Fig. 7 is a primary equivalent circuit diagram of an ultrasonic vibrator in the magnetic coupling resonant wireless energy transmission device of the invention.
Fig. 8 is a secondary equivalent circuit diagram of an ultrasonic vibrator in the magnetic coupling resonant wireless energy transmission device of the present invention.
Fig. 9 is a schematic circuit diagram of a second embodiment of the magnetic coupling resonant wireless energy transmission device according to the present invention.
Fig. 10 is a coupling structure diagram of the primary large-diameter coil and the secondary small-diameter coil of the magnetic coupling resonance type wireless energy transmission device of the invention.
Fig. 11 is a flow chart of the magnetic coupling resonant wireless energy transmission method of the present invention.
Fig. 12 is a simulation data diagram of the diameter and coupling coefficient of the primary coil in the magnetic coupling resonant wireless energy transmission method of the present invention.
Detailed Description
The invention provides a magnetic coupling resonant wireless energy transmission device and a magnetic coupling resonant wireless energy transmission method, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the attached drawings and taking examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the embodiments and claims, the articles "a", "an", "the" and "the" may include plural forms as well, unless the context specifically dictates otherwise. If there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 10, the present invention provides a magnetic coupling resonant wireless energy transmission device according to a preferred embodiment.
As shown in fig. 1 and fig. 2, the present invention provides a magnetic coupling resonant wireless energy transmission device, including: an excitation voltage source 100, a primary resonance circuit 200, a secondary resonance circuit 300, and an ultrasonic vibrator 400;
the primary resonant circuit 200 is connected to the excitation voltage source 100, and the frequency f1 of the primary resonant circuit 200 is the same as the frequency f2 of the excitation voltage source 100; the secondary resonance circuit 300 is connected to the primary resonance circuit 200 and the ultrasonic vibrator 400, respectively, and the frequency f3 of the secondary resonance circuit 300 and the ultrasonic vibrator 400 as a whole is the same as the frequency f1 of the excitation voltage source.
Specifically, the excitation voltage source 100 is connected to the primary resonant circuit 200, and the frequency of the primary resonant circuit 200 is the same as the frequency of the excitation voltage source 100, and when the frequency f1 of the primary resonant circuit 200 is the same as the frequency f3 of the excitation voltage source 100, the capacitive reactance and the inductive reactance of the primary resonant circuit 200 are equal, and the impedance is zero, so that resonance occurs, and the circuit current reaches the maximum value. The primary resonant circuit 200 is connected to the secondary resonant circuit 300 by means of magnetic coupling, which is to allow a current change of one circuit to affect another circuit by mutual inductance. The secondary resonant circuit 300 is further connected with the ultrasonic vibrator 400, and the ultrasonic vibrator 400 is composed of a rear cover plate, piezoelectric ceramics, a front cover plate, an amplitude transformer, a flange plate and a processing cutter. The electric energy can be converted into mechanical energy, namely the electric energy receives the electric signal output by the secondary resonance circuit and performs rotary motion to machine the machine tool. When the frequency f2 of the whole of the secondary resonance circuit 300 and the ultrasonic vibrator 400 is the same as the frequency f3 of the excitation voltage source, a loop formed by the secondary resonance circuit 300 and the ultrasonic vibrator 400 resonates, and thus the energy transmission efficiency is improved.
It should be noted that, as shown in fig. 3, the magnetic coupling induction type wireless energy transmission technology is realized by the primary coil L P And a secondary coil L S Magnetic core therebetween such that primary coil L P And a secondary coil L S Electromagnetic induction is generated to realize energy transmission. In order to generate electromagnetic induction, a primary coil L is required P And a secondary coil L S Must not be too far apart, e.g., d1 is between 0.1mm and 1 mm; and also the primary coil L needs to be secured P And a secondary coil L S Is aligned, due to installation errors, the primary coil L P And a secondary coil L S The angular deviation of (2) is unavoidable, and once the mounting deviation occurs, when the secondary coil L S In the case of high-speed rotation, this will result in the primary coil L P And a secondary coil L S The collision and the stability are reduced, and as shown in fig. 2 and 4, the magnetic coupling resonance type wireless energy transmission makes the primary resonant circuit 200 resistive and the loop formed by the secondary resonant circuit 300 and the ultrasonic vibrator 400 resistive by the same frequency as the excitation voltage source 100 to generateGenerating resonance for energy transmission, wherein the primary coil L P And a secondary coil L S Is relatively wide, e.g. d2 is larger than 1mm, even up to 10mm, whereby the transmission distance is long and due to the primary coil L P And a secondary coil L S Is wider at the secondary coil L S Is not easy to contact with the primary coil L during rotation P A collision is generated.
Wherein, as shown in FIG. 5, when the primary coil L is wound P And the secondary coil L S When both are circular, the primary coil L P And the secondary coil L S May be the primary coil L P And the secondary coil L S When the primary coil L is wound, is a distance d3 between the axial centers P Is arc-shaped, the secondary coil L S When it is circular, the primary coil L P And the secondary coil L S May be the primary coil L P With the secondary coil L S The distance d4 between the edges is not particularly limited.
As shown in fig. 6 and 9, in one embodiment, the primary resonant circuit 200 includes: a first resistor R1, a first capacitor C1, and a primary coil L P (ii) a One end of the first capacitor C1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the primary coil L P Is connected to one end of the primary coil L P The other end of the excitation voltage source 100 is connected to one end of the excitation voltage source 100, and the other end of the excitation voltage source 100 is connected to the other end of the first capacitor C1.
Specifically, the first resistor R1 is a total resistance of the primary resonant circuit 200, the first capacitor C1 is a primary series compensation capacitor, and the primary coil L is P Which may be equivalently an inductor, the primary resonant circuit 200 has a frequency of
Figure BDA0003862277280000081
If the frequency f1 of the primary resonant circuit 200 is equal to the frequency f3 of the excitation voltage source 100, a resonance occurs, and the first resonant circuit is drivenA capacitor C1, the first resistor R1, and the primary coil L P And the loop formed by the excitation voltage source 100 is resistive, that is, the current of the loop reaches the maximum value, so that the transmission efficiency of energy is improved.
In one embodiment, as shown in fig. 6, the secondary resonant circuit 300 includes: a second resistor R2, a second capacitor C2, and a secondary coil L S And a first inductance L1; one end of the second resistor R2 is connected with one end of the second capacitor C2, the other end of the second capacitor C2 is connected with one end of the first inductor L1, the other end of the first inductor L1 is connected with one end of the ultrasonic vibrator 400, and the other end of the ultrasonic vibrator 400 is connected with the secondary coil L S Is connected to one end of the secondary coil L S And the other end thereof is connected to the second resistor R2.
Specifically, the second resistor R2 is a total resistance of the secondary resonant circuit 300, the second capacitor C2 is a series compensation capacitor of the secondary resonant circuit 300, and the secondary coil L S Equivalent to inductance, for connection with the primary coil L P Mutual inductance is generated to realize current conversion. The first inductor L1 is a matching inductor, and is used to improve the electromechanical coupling efficiency of the ultrasonic vibrator 400. In the field of rotary ultrasonic machining, the ultrasonic vibrator performs high-speed rotary motion according to the electric energy transmitted by the secondary resonance circuit 300 to realize machining operation.
The ultrasonic vibrator 400 is equivalent to a capacitor connected in parallel with an RLC circuit, as shown in fig. 7, one end of the third capacitor C3 is connected to one end of the second inductor L2, the other end of the second inductor L2 is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the other end of the third capacitor C3. The overall frequency of the first inductor L1 and the ultrasonic vibrator 400 is:
Figure BDA0003862277280000091
Figure BDA0003862277280000092
C 5 ＝(C 3 ×C 4 )+(C 3 +C 4 )；
fig. 8 is a circuit diagram of the ultrasound oscillator of fig. 7 after secondary equivalence, xs is an equivalent capacitance of the ultrasound oscillator, rs is an equivalent series resistance of the ultrasound oscillator, L1 is an inductance value of the first inductor L1, and ω is an angular frequency.
The secondary coil L is also present due to the secondary resonant circuit 300 S The secondary coil L S Therefore, a second capacitor C2 is added to the secondary resonant circuit 300 to make the inductive reactance and the capacitive reactance in the circuit formed by the secondary resonant circuit 300 and the ultrasonic transducer 400 equal, and the impedance is zero, i.e., a resistive value is presented, so as to generate resonance later. In particular, the secondary coil L S And the frequency formula formed by the second capacitor C2 is
Figure BDA0003862277280000093
By adjusting the capacitance value of the second capacitor C2 so that f5= f4, the frequency f2 of the secondary resonance circuit 300 and the entire ultrasonic transducer 400 is determined, that is, f2= f5= f4, and by making the frequency f2 of the secondary resonance circuit 300 and the entire ultrasonic transducer 400, the frequency f1 of the primary resonance circuit 200, and the frequency f3 of the excitation voltage source 100 the same, resonance is generated, and the energy transfer efficiency is improved.
In the second embodiment, as shown in fig. 9, the secondary resonance circuit includes: second resistor R2, secondary coil L S (ii) a One end of the second resistor R2 is connected to one end of the ultrasonic vibrator 400, and the other end of the ultrasonic vibrator 400 is connected to the other end of the second resistor R2.
In particular, since the added capacitance at the secondary resonance circuit 300, although improving the transmission efficiency of energy, enables the transmission of energy over a long distance, this additional added capacitance needs to be attached to the ultrasound transducer 400,this may cause an uneven mass distribution of the ultrasonic vibrator 400, resulting in an unbalance when the ultrasonic vibrator 400 rotates. Therefore, the compensation capacitance, i.e., the second capacitance C2, is removed in the secondary resonance circuit 300. Determining the equivalent capacitance of the ultrasound transducer 400 and the secondary coil L S Frequency of (2)
Figure BDA0003862277280000094
That is, the frequency of the secondary resonant circuit 300 and the entire ultrasonic vibrator 400 is f2= f6, and the frequency f2 of the secondary resonant circuit 300 and the entire ultrasonic vibrator 400, the frequency f1 of the primary resonant circuit 200, and the frequency f3 of the excitation voltage source 100 are made the same, thereby generating resonance, and achieving high wireless energy transmission efficiency while maintaining the rotational balance of the ultrasonic vibrator 400.
In one embodiment, as shown in fig. 10, the primary coil Lp has a larger diameter than the secondary coil L S Wherein at the secondary coil L S When the diameter of the primary coil Lp is determined, the diameter of the primary coil Lp calculates the optimal solution of the diameter of the primary coil Lp through electromagnetic simulation software, so that the primary coil Lp and the secondary coil L are enabled to be connected S The coupling coefficient of (a) reaches a maximum value.
Specifically, in the rotary ultrasonic machining apparatus, the ultrasonic vibrator 400 and the secondary coil L S In combination, the secondary coil L is arranged to generate resonance when wireless energy transfer is achieved S Needs to rotate in synchronization with the ultrasonic vibrator 400, wherein the secondary coil L S The heavier the weight of (a), the greater the linear velocity and moment of inertia at high speed rotation, affecting the stability of subsequent ultrasonic processing. Wherein the primary coil L P And the secondary coil L S The larger the diameter of (C) is, the larger the primary coil L is P And a secondary coil L S Is larger than the coupling coefficient of the primary coil L P And the secondary coil L S The greater the coupling coefficient of (a), the higher the transmission efficiency of energy. Through simulation analysis and experimental verification, the primary coil L is discovered P Diameter and secondary coil L S Are not coupled when the diameters are uniformWhen the number is at its maximum, but with the primary coil L P Increased diameter primary coil L P And a secondary coil L S The coupling coefficient of (a) increases first and then decreases. Therefore, by setting the secondary coil L of small diameter S In the secondary coil L S After the determination, the optimal primary coil L is calculated through the combined simulation of Maxwell software and Simplorer software P Size. To achieve a reduction in the secondary coil L while achieving a high energy transfer efficiency S Further, the volume and the mass of the ultrasonic vibrator 400 are reduced, and the stability of ultrasonic processing is improved.
The invention also provides a magnetic coupling resonant wireless energy transmission method, which comprises the following steps:
s1, determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the secondary resonance circuit and the ultrasonic vibrator.
And S11, determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the ultrasonic vibrator, the inductance value of the secondary coil, the inductance value of the first inductor and the capacitance value of the second capacitor.
Specifically, the formula of the first inductor and the overall frequency of the ultrasonic vibrator is
Figure BDA0003862277280000111
Figure BDA0003862277280000112
C 5 ＝(C 3 ×C 4 )+(C 3 +C 4 )；
Wherein f4 is the frequency of the first inductor and the whole ultrasonic vibrator, and f3 is the frequency of the excitation voltage source; xs is the equivalent capacitance of the ultrasonic vibrator, L1 is the inductance value of the first inductor L1, and omega is the angular frequency.
Since the parameters of the ultrasonic vibrator are fixed and can be equivalent to capacitance, the first inductor is determined by the inductance value of the first inductorThe inductance and the frequency of the whole ultrasonic vibrator are increased, but because the secondary resonant circuit also has a secondary coil, and the inductance of the secondary coil can influence the loop formed by the secondary resonant circuit and the ultrasonic vibrator to be resistive, the first capacitance is increased according to the frequency formula of the secondary resonant circuit
Figure BDA0003862277280000113
The capacitance value of the first capacitor is selected so that f5= f4, so that the loop formed by the secondary resonance circuit and the ultrasonic vibrator is resistive.
And S12, determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the ultrasonic vibrator and the parameters of the secondary coil.
Specifically, the first capacitor needs to be attached to the ultrasonic vibrator, so that the mass distribution of the ultrasonic vibrator is uneven, and the rotation imbalance of the ultrasonic vibrator is further influenced. Thus, by removing the first capacitance and the first inductance, the overall frequency of the secondary resonance circuit and the ultrasound transducer is determined to be
Figure BDA0003862277280000114
And the problem of unbalanced rotation of the ultrasonic vibrator can be solved by removing the first capacitor.
S2, selecting parameters of the primary resonance circuit to enable the frequency of the primary resonance circuit to be the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator.
Wherein the frequency formula of the primary resonant circuit is
Figure BDA0003862277280000115
And selecting the capacitance value of the first capacitor to enable the frequency of the primary resonance circuit to be the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator, so as to generate resonance for a subsequent loop formed by the secondary resonance circuit and the ultrasonic vibrator.
S21, selecting the diameter of the secondary coil, and calculating the optimal solution of the diameter of the primary coil according to electromagnetic simulation under the condition that the diameter of the secondary coil is constant.
After determining the parameters of the secondary resonance circuit, namely the inductance value of the secondary coil, wherein the coil diameter influences the inductance value of the coil, therefore, when the inductance value of the secondary coil is determined, namely the diameter of the secondary coil is determined, and when the inductance value of the secondary coil is determined, the optimal solution of the diameter of the primary coil is obtained through Maxwell software simulation, and the optimal solution is the time when the coupling coefficient of the primary coil and the secondary coil is maximum, namely the time when the energy transmission efficiency is highest. For example, as shown in fig. 12, the diameter of the secondary coil is selected to be 100mm, and the distance between the primary coil and the secondary coil is 5mm, the primary coil is changed from 50mm to 250mm through simulation of Maxwell software, and the coupling coefficient is maximized when the diameter of the primary coil is 125mm according to experimental data.
And S3, adjusting the frequency of an excitation voltage source to enable the frequency of the excitation voltage source to be the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator.
And adjusting the frequency of an excitation voltage source to enable the frequency of the excitation voltage source to be the same as the natural frequency of a secondary resonance circuit, so as to generate resonance and improve the transmission efficiency of energy, wherein the secondary resonance circuit is a circuit formed by the secondary resonance circuit and the ultrasonic vibrator.
In summary, the magnetic coupling resonant wireless energy transmission device and method provided by the present invention include: the ultrasonic transducer comprises an excitation voltage source, a primary resonance circuit, a secondary resonance circuit and an ultrasonic vibrator; the primary resonant circuit is connected with the excitation voltage source, and the frequency of the primary resonant circuit is the same as that of the excitation voltage source; the secondary resonance circuit is respectively connected with the primary resonance circuit and the ultrasonic vibrator, and the frequency of the whole secondary resonance circuit and the ultrasonic vibrator is the same as that of the excitation voltage source. According to the invention, the frequency of the primary resonance circuit is the same as that of the excitation voltage source, and the frequency of the secondary resonance circuit and the whole ultrasonic vibrator is the same as that of the excitation voltage source, so that the whole loop of the secondary resonance circuit and the whole ultrasonic vibrator generates resonance, thereby obtaining the maximum amplitude and improving the energy transmission efficiency. And energy is transmitted in a resonance mode, and the transmission distance is long.
It will be understood that the invention is not limited to the examples described above, but that modifications and variations will occur to those skilled in the art in light of the above teachings, and that all such modifications and variations are considered to be within the scope of the invention as defined by the appended claims.

Claims (10)

1. A magnetic coupling resonant wireless energy transfer device, comprising: the ultrasonic transducer comprises an excitation voltage source, a primary resonance circuit, a secondary resonance circuit and an ultrasonic vibrator;
the primary resonance circuit is connected with the excitation voltage source, and the frequency of the primary resonance circuit is the same as that of the excitation voltage source;
the secondary resonance circuit is respectively connected with the primary resonance circuit and the ultrasonic vibrator, and the frequency of the whole secondary resonance circuit and the ultrasonic vibrator is the same as that of the excitation voltage source.
2. A magnetically coupled resonant wireless energy transfer device according to claim 1, wherein the primary resonant circuit comprises: the first resistor, the first capacitor and the primary coil;
one end of the first capacitor is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the primary coil, the other end of the primary coil is connected with one end of the excitation voltage source, and the other end of the excitation voltage source is connected with the other end of the first capacitor.
3. A magnetically coupled resonant wireless energy transfer device according to claim 2, wherein the secondary resonant circuit comprises: the second resistor, the second capacitor, the secondary coil and the first inductor;
one end of the second resistor is connected with one end of the second capacitor, the other end of the second capacitor is connected with one end of the first inductor, the other end of the first inductor is connected with one end of the ultrasonic vibrator, the other end of the ultrasonic vibrator is connected with one end of the secondary coil, and the other end of the secondary coil is connected with the other end of the second resistor.
4. A magnetically coupled resonant wireless energy transfer device according to claim 2, wherein the secondary resonant circuit comprises: a second resistor and a secondary coil;
one end of the second resistor is connected with one end of the ultrasonic vibrator, the other end of the ultrasonic vibrator is connected with one end of the secondary coil, and the other end of the secondary coil is connected with the other end of the second resistor.
5. A magnetically coupled resonant wireless energy transfer device according to claim 3 or 4, wherein the distance between the primary coil and the secondary coil is greater than 1mm.
6. A magnetically coupled resonant wireless energy transfer device according to claim 3 or claim 4, wherein the diameter of the primary coil is greater than the diameter of the secondary coil.
7. A magnetic coupling resonant wireless energy transmission method is characterized by comprising the following steps:
determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the secondary resonance circuit and the ultrasonic vibrator;
selecting parameters of a primary resonant circuit to enable the frequency of the primary resonant circuit to be the same as the frequency of the secondary resonant circuit and the whole ultrasonic vibrator;
and adjusting the frequency of the excitation voltage source so that the frequency of the excitation voltage source is the same as the frequency of the secondary resonance circuit and the whole ultrasonic vibrator.
8. A magnetic coupling resonant wireless energy transmission method according to claim 7, wherein the step of determining the frequency of the secondary resonant circuit and the ultrasonic vibrator as a whole based on the parameters of the secondary resonant circuit and the ultrasonic vibrator comprises:
and determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the ultrasonic vibrator, the inductance value of the secondary coil, the inductance value of the first inductor and the capacitance value of the second capacitor.
9. A magnetic coupling resonant wireless energy transmission method according to claim 8, wherein the step of determining the frequency of the secondary resonant circuit and the ultrasonic vibrator as a whole based on the parameters of the secondary resonant circuit and the ultrasonic vibrator comprises:
and determining the frequency of the secondary resonance circuit and the whole ultrasonic vibrator according to the parameters of the ultrasonic vibrator and the parameters of the secondary coil.
10. A magnetic coupling resonant wireless energy transmission method according to claim 7, wherein the step of selecting a primary resonant circuit parameter such that the primary resonant circuit frequency is the same as the secondary resonant circuit frequency and the entire ultrasound transducer comprises:
and selecting the diameter of the secondary coil, and calculating the optimal solution of the diameter of the primary coil according to electromagnetic simulation under the condition that the diameter of the secondary coil is constant.
CN202211179241.8A 2022-09-23 2022-09-23 Magnetic coupling resonant wireless energy transmission device and method Pending CN115566813A (en)

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