CN111030319A - Underwater non-contact wireless energy transmission system based on ultrasonic waves - Google Patents

Underwater non-contact wireless energy transmission system based on ultrasonic waves Download PDF

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CN111030319A
CN111030319A CN201911175902.8A CN201911175902A CN111030319A CN 111030319 A CN111030319 A CN 111030319A CN 201911175902 A CN201911175902 A CN 201911175902A CN 111030319 A CN111030319 A CN 111030319A
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impedance
representing
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ultrasonic transducer
matching network
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吕舒晗
杜依诺
张宝军
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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
    • H02J50/15—Circuit arrangements or systems for wireless supply or distribution of electric power using ultrasonic waves

Abstract

The application discloses an underwater non-contact wireless energy transmission system based on ultrasonic waves, which comprises an excitation signal source, an ultrasonic transducer and a transmission terminal, wherein the excitation signal source is used for outputting an excitation signal to the ultrasonic transducer at the transmission terminal; the transmitting end ultrasonic transducer is used for receiving the excitation signal and converting the excitation signal into ultrasonic waves; the receiving end ultrasonic transducer is used for receiving the ultrasonic waves sent by the transmitting end ultrasonic transducer and converting the ultrasonic waves into alternating current signals; the AC-DC converter is used for receiving the alternating current signal sent by the ultrasonic transducer at the receiving end and converting the alternating current signal into a direct current signal for driving a load; and the load is used for receiving the direct current signal sent by the AC-DC converter. This application embodiment is through adopting the ultrasonic wave as energy transmission medium, owing to can carry out better propagation in aqueous as the ultrasonic wave of a mechanical wave, especially the loss is less on the energy transmission of well long distance section to can charge to the electric load high-efficiently, conveniently.

Description

Underwater non-contact wireless energy transmission system based on ultrasonic waves
Technical Field
The invention relates to the technical field of ocean exploration, in particular to an underwater non-contact wireless energy transmission system based on ultrasonic waves.
Background
The ocean is a vast body of water whose earth's surface is divided by continents and communicated with each other. As a second natural environment on which human beings rely for survival, the oceans have the self characteristics of wide area, 70.8 percent of the global surface area, a large amount of mineral resources and biological resources, and the like.
Compared with the land, the land has wide ocean area, and various ocean bodies and ocean activities are in a highly dispersed state, so that the land is difficult to establish contact with each other and brings difficulty to the management and monitoring of the ocean activities. Therefore, in the process of ocean resource development and ocean environment monitoring, a large number of electromechanical devices and sensing devices need to be arranged, and how to conveniently supplement electric energy to the electric devices is one of the key technologies for scientifically and effectively developing ocean resources and monitoring ocean environments. Currently, the charging mode includes repeatedly fetching the electronic device for charging, wet plugging and unplugging the connector, or a magnetic coupling-based wireless charging technology.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: firstly, the electronic equipment is repeatedly fished for charging, a large amount of manpower is consumed, the operability is not strong, and the time is wasted; secondly, potential safety hazards exist when the joints of the electronic equipment are inserted and pulled out in a wet mode, and the lives of personnel are threatened; thirdly, water has a severe attenuation effect on the magnetic field, and eddy current generated by the magnetic field in water adversely affects the magnetic field, so that the magnetic coupling-based wireless charging technology can only meet high-power wireless energy transmission in a very short distance, and when the coupling distance is increased, the charging efficiency is rapidly attenuated, and the charging requirement of the electronic equipment cannot be met.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide an underwater contactless wireless energy transmission system based on ultrasonic waves, which uses ultrasonic waves as an energy transmission medium, and can efficiently and conveniently charge electric devices because ultrasonic waves, which are a kind of mechanical waves, can be well propagated in water, and especially, the loss is small in energy transmission in a medium-long distance section.
The application provides an underwater non-contact wireless energy transmission system based on ultrasonic waves, includes:
the excitation signal source is used for outputting an excitation signal to the transmitting end ultrasonic transducer;
the transmitting end ultrasonic transducer is used for receiving the excitation signal and converting the excitation signal into ultrasonic waves;
the receiving end ultrasonic transducer is used for receiving the ultrasonic waves sent by the transmitting end ultrasonic transducer and converting the ultrasonic waves into alternating current signals;
the AC-DC converter is used for receiving the alternating current electric signal sent by the receiving end ultrasonic transducer and converting the alternating current electric signal into a direct current electric signal for driving a load;
and the load is used for receiving the direct current signal sent by the AC-DC converter.
Optionally, the system further comprises a first impedance matching network and a second impedance matching network;
the input end of the first impedance matching network is connected with the output end of the excitation signal source, the output end of the first impedance matching network is connected with the input end of the transmitting end ultrasonic transducer, and the first impedance matching network is used for adjusting the source impedance of the system;
the input end of the second impedance matching network is connected with the output end of the receiving-end ultrasonic transducer, the output end of the second impedance matching network is connected with the input end of the AC-DC converter, and the second impedance matching network is used for adjusting the load impedance of the system.
Optionally, the source impedance of the system is:
Figure BDA0002289934760000021
α1＝-2j Re{Z22}Im{Z11}+j Im{Z12Z21}
Δ＝(2Re{Z11}Re{Z22}-Re{Z12Z21})2-|Z12Z21|2
Figure BDA0002289934760000022
Figure BDA0002289934760000023
Figure BDA0002289934760000024
Figure BDA0002289934760000031
wherein Z ismSRepresenting the source impedance, Re representing the real part of the complex number, Im representing the imaginary part of the complex number; z0Denotes a reference impedance, Z11Represents the scattering parameter S11Corresponding impedance parameter, Z12Represents the scattering parameter S12Corresponding impedance parameter, Z21Represents the scattering parameter S21Corresponding impedance parameter, Z22Represents the scattering parameter S22A corresponding impedance parameter; scattering parameter S11Representing the input reflection coefficient, scattering parameter S12Representing the backward transmission coefficient, scattering parameter S21Representing the forward transmission coefficient, scattering parameter S22Representing the output reflection coefficient.
Optionally, the load impedance of the system is:
Figure BDA0002289934760000032
α2＝-2j Re{Z11}Im{Z22}+j Im{Z12Z21}
Δ＝(2Re{Z11}Re{Z22}-Re{Z12Z21})2-|Z12Z21|2
Figure BDA0002289934760000033
Figure BDA0002289934760000034
Figure BDA0002289934760000035
Figure BDA0002289934760000036
wherein Z ismLRepresenting the load impedance, Re representing the real part of the complex number, Im representing the imaginary part of the complex number; z0Denotes a reference impedance, Z11Represents the scattering parameter S11Corresponding impedance parameter, Z12Represents the scattering parameter S12Corresponding impedance parameter, Z21Represents the scattering parameter S21Corresponding impedance parameter, Z22Represents the scattering parameter S22A corresponding impedance parameter; scattering parameter S11Representing the input reflection coefficient, scattering parameter S12Representing the backward transmission coefficient, scattering parameter S21Representing the forward transmission coefficient, scattering parameter S22Representing the output reflection coefficient.
Optionally, the AC-DC converter comprises a resonant rectifier and a DC-DC converter connected in series.
Optionally, the resonant rectifier comprises a bridge rectifier, a resonant inductor and a resonant capacitor;
the resonant inductor is disposed between the second impedance matching network and the bridge rectifier;
the number of the resonance capacitors is 4, and the resonance capacitors are respectively connected in parallel with two ends of 4 diodes of the bridge rectifier.
Optionally, the input impedance of the first impedance matching network, the output impedance of the second impedance matching network, and the input impedance of the radio frequency AC-DC converter are all 50 Ω.
Optionally, the load is an electronic device that outputs voice.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides an underwater non-contact wireless energy transmission system based on ultrasonic waves, which comprises an excitation signal source, a transmitting end ultrasonic transducer and a receiving end ultrasonic transducer, wherein the excitation signal source is used for outputting an excitation signal to the transmitting end ultrasonic transducer; the transmitting end ultrasonic transducer is used for receiving the excitation signal and converting the excitation signal into ultrasonic waves; the receiving end ultrasonic transducer is used for receiving the ultrasonic waves sent by the transmitting end ultrasonic transducer and converting the ultrasonic waves into alternating current signals; the AC-DC converter is used for receiving the alternating current signal sent by the ultrasonic transducer at the receiving end and converting the alternating current signal into a direct current signal for driving a load; and the load is used for receiving the direct current signal sent by the AC-DC converter. This application embodiment is through adopting the ultrasonic wave as energy transmission medium, owing to can carry out better propagation in aqueous as the ultrasonic wave of a mechanical wave, especially the loss is less on the energy transmission of well long distance section to can charge to the electric load high-efficiently, conveniently.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a basic structure of an ultrasonic-based underwater contactless wireless energy transmission system according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another ultrasonic-based underwater contactless wireless energy transmission system provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a Smith chart according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of an rf AC-DC converter according to an embodiment of the present disclosure.
Reference numerals:
1-an underwater non-contact wireless energy transmission system based on ultrasonic waves, 11-an excitation signal source, 12-a transmitting end ultrasonic transducer, 13-a receiving end ultrasonic transducer, 14-an AC-DC converter, 15-a load, 16-a first impedance matching network and 17-a second impedance matching network.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
For convenience of understanding and explanation, the ultrasonic wave based underwater contactless wireless energy transmission system provided by the embodiment of the present application is explained in detail by fig. 1 to 4.
Please refer to fig. 1, which is a schematic diagram illustrating a basic structure of an underwater contactless wireless energy transmission system based on ultrasonic waves according to an embodiment of the present application. The underwater non-contact wireless energy transmission system 1 based on ultrasonic waves comprises an excitation signal source 11, a transmitting end ultrasonic transducer 12, a receiving end ultrasonic transducer 13, an AC-DC converter 14 and a load 15.
The excitation signal source 11 is configured to output an excitation signal to the transmitting-end ultrasonic transducer 12; the transmitting end ultrasonic transducer 12 is used for receiving the excitation signal and converting the excitation signal into ultrasonic waves; the receiving end ultrasonic transducer 13 is used for receiving the ultrasonic wave emitted by the transmitting end ultrasonic transducer 12 and converting the ultrasonic wave into an alternating current signal; the AC-DC converter 14 is configured to receive the AC signal sent by the receiving-end ultrasound transducer 13, and convert the AC signal into a DC signal for driving the load 15; the load 15 is used for receiving a direct current signal sent by the AC-DC converter 14. Because the ultrasonic wave as a mechanical wave can be well propagated in water, the loss is small especially on the energy transmission of the medium-long distance section, and the electric load can be charged efficiently and conveniently. In addition, since the ultrasonic wave-based underwater contactless wireless energy transmission system 1 may include at least one receiving-end ultrasonic transducer 13, it is possible to simultaneously charge a plurality of electric loads.
Optionally, as shown in fig. 2, which is a schematic structural diagram of another ultrasonic-based underwater contactless wireless energy transmission system provided in the embodiment of the present application. The underwater non-contact wireless energy transmission system 1 based on ultrasonic waves further comprises a first impedance matching network 16 and a second impedance matching network 17, wherein the input end of the first impedance matching network 16 is connected with the output end of the excitation signal source 11, the output end of the first impedance matching network 16 is connected with the input end of the ultrasonic transducer 12 at the transmitting end, and the first impedance matching network 16 is used for adjusting the source impedance of the system 1; and the input end of the second impedance matching network 17 is connected to the output end of the receiving-end ultrasonic transducer 13, the output end of the second impedance matching network 17 is connected to the input end of the AC-DC converter 14, and the second impedance matching network 17 is used for adjusting the load impedance of the system 1. Therefore, the embodiment of the present application can improve the wireless energy transmission efficiency between the transmitting-side ultrasonic transducer 12 and the receiving-side ultrasonic transducer 13 through the impedance matching circuit.
Optionally, the impedance matching network is obtained by: measuring scattering parameters between the transmitting end ultrasonic transducer 12 and the receiving end ultrasonic transducer 13, wherein the scattering parameters comprise a forward transmission coefficient, a backward transmission coefficient, an input reflection coefficient and an output reflection coefficient; further, the topology of the impedance matching network is determined from the scattering parameters and the smith chart, wherein the impedance matching network comprises a first impedance matching network 16 and a second impedance matching network 17. For example, the scattering parameter S includes a back propagation coefficient S12Forward transmission coefficient S21Input reflection coefficient S11And the output reflection coefficient S22. Wherein the reverse transmission coefficient S12When port 1 is matched, the transmission parameters from port 2 to port 1 can obtain the forward transmission coefficient S21Input reflection coefficient S11And an output reflection coefficient S22And the meaning of the transmission parameters is not described in detail.
It is easy to understand that the forward transmission coefficient S21The larger the energy loss, the higher the transmission efficiency. In the actual measurement of the scattering parameter S, a vector analyzer was used for the test. For example, first, in order to cooperate with the vector analyzer, the interface between the transmitting end ultrasonic transducer 12 and the receiving end ultrasonic transducer 13 needs to be manufactured firstAn N-type joint; secondly, after the instrument is calibrated, the transmitting end and the receiving end are respectively connected to two interfaces of the instrument; thirdly, setting parameters such as frequency bands and power to be measured, and displaying four groups of measured curves of the S parameter by the instrument; further, an MATLAB is adopted on a computer to reduce and analyze the measurement curve, the file data are a plurality of discrete points obtained by decomposing the curve, array division is carried out according to four parameters, and each array corresponds to a reverse transmission coefficient S12Forward transmission coefficient S21Input reflection coefficient S11And the output reflection coefficient S22. Due to the forward transmission coefficient S21The larger the size, the better, and therefore the examples of this application are at S21Finds out the highest point of the curve, namely the frequency point with the maximum transmission parameter, and takes the maximum frequency point as the working frequency of the ultrasonic-based underwater non-contact wireless energy transmission system 1, and further finds out the S corresponding to the maximum frequency point in other arrays12、S11And S22The value is obtained.
Specifically, the determining the topology structure of the impedance matching network according to the scattering parameters and the smith chart includes: converting the scattering parameters to obtain impedance parameters corresponding to the scattering parameters, and calculating to obtain the source impedance and the load impedance of the impedance matching network based on the impedance parameters; further, a topology corresponding to the source impedance and the load impedance is searched in the smith chart, as shown in fig. 3, which is a schematic diagram of the smith chart provided in the embodiment of the present application. It should be noted that Smith chart (Smith chart) is a common chart of motor and electronic engineering, and bilinear transformation is adopted on a complex plane, and is mainly used for impedance matching of a transmission line.
Optionally, the scattering parameter is converted to obtain an impedance parameter corresponding to the scattering parameter, and specifically, the impedance parameter is calculated by the following formula:
Figure BDA0002289934760000071
Figure BDA0002289934760000072
Figure BDA0002289934760000073
Figure BDA0002289934760000074
in formulae (1) to (4), Z11Represents the scattering parameter S11Corresponding impedance parameter, Z0Denotes a reference impedance, Z12Represents the scattering parameter S12Corresponding impedance parameter, Z21Represents the scattering parameter S21Corresponding impedance parameter, Z22Represents the scattering parameter S22A corresponding impedance parameter; scattering parameter S11Representing the input reflection coefficient, scattering parameter S12Representing the backward transmission coefficient, scattering parameter S21Representing the forward transmission coefficient, scattering parameter S22Representing the output reflection coefficient. Wherein the reference impedance Z0In the case where the input impedance and the output impedance of the impedance matching network are determined, they are fixed values. For example, when the input impedance and the output impedance of the impedance matching network are both 50 Ω, the reference impedance Z is set0Also 50 omega.
Optionally, based on the impedance parameter, the source impedance and the load impedance of the impedance matching network are calculated, specifically calculated by the following formula:
Figure BDA0002289934760000075
Figure BDA0002289934760000076
wherein, α1＝-2j Re{Z22}Im{Z11}+j Im{Z12Z21} (7)
α2＝-2j Re{Z11}Im{Z22}+j Im{Z12Z21} (8)
Δ＝(2Re{Z11}Re{Z22}-Re{Z12Z21})2-|Z12Z21|2(9) In formulae (5) to (9), ZmsRepresenting the source impedance, ZmLRepresenting the load impedance; re denotes the real part of the complex number and Im denotes the imaginary part of the complex number.
Optionally, as shown in fig. 4, it is a schematic diagram of a circuit structure of a radio frequency AC-DC converter provided in the embodiment of the present application. The AC-DC converter 14 includes a resonance type rectifier and a DC-DC converter connected in sequence, for example, the resonance type rectifier includes a bridge rectifier, a resonance inductor and a resonance capacitor, wherein the resonance inductor L1Arranged between the second impedance matching network 17 and the bridge rectifier and having 4 resonant capacitors, i.e. C1～C4Each connected in parallel to 4 diodes of the bridge rectifier, i.e. D1～D4At both ends of the same. According to the embodiment of the application, the high-frequency alternating current signals received by the ultrasonic transducer can be converted into stable direct current signals through the alternating current-direct current converter, and the charging safety of the power load is guaranteed. Compared with a common bridge rectifier, the radio frequency AC-DC converter 14 adds a resonant inductor L1And four resonance capacitors C1～C4. In addition, the radio frequency AC-DC converter 14 further comprises a DC-DC converter, i.e. a capacitor C5The resistor R is used for stabilizing the output voltage, and the load 15 is represented by the resistor R, for example, the load 15 is an electronic device outputting voice, but the load 15 may also be any other electronic device with small power, which is not limited in this embodiment of the application.
Note that, the resonance inductance L1And a resonance capacitor C1～C4The on-period of the resonant rectifier can be extended by the current resonance between the two. According to FIG. 4, the resonant inductance L1And a resonance capacitor C1～C4The parameter values are obtained by the following process: first, an input voltage V is determinedinAnd an output voltage VconTo obtain a voltage ratio αV＝Vcon/Vin；
Secondly, the frequency ratio is determined
Figure BDA0002289934760000081
Secondly, dimensionless parameters are calculated
Figure BDA0002289934760000082
Next, the resonance inductance L is calculated1The value:
Figure BDA0002289934760000083
in the formula (10), Zin，AC-DCRepresenting the input impedance, f, of the radio frequency AC-DC converter 14inRepresenting the input frequency of the rf AC-DC converter 14.
Next, the resonance frequency f is calculatedre＝αffin；
Finally, the resonance capacitance C value is calculated:
Figure BDA0002289934760000084
wherein, the resonant capacitor C1～C4Are all C values.
Optionally, in the embodiment of the present application, the input impedance of the first impedance matching network 16, the output impedance of the second impedance matching network 17, and the input impedance of the radio frequency AC-DC converter 14 are all 50 Ω, so that the system 1 has high wireless energy transmission efficiency.
Taking the underwater non-contact wireless energy transmission system based on ultrasonic waves shown in fig. 2 as an example for explanation, the construction and test process of the system 1 in the embodiment of the present application mainly includes the following steps: firstly, connecting a transmitting end ultrasonic transducer 12 with a first impedance matching network 16, and connecting a receiving end ultrasonic transducer 13 with a second impedance matching network 17, wherein a water environment is formed between the transmitting end ultrasonic transducer 12 and the receiving end ultrasonic transducer 13; secondly, connecting the second impedance matching network 17 of the receiving-end ultrasonic transducer 13 with the AC-DC converter 14; then, the output end of the AC-DC converter 14 is connected to a load 15, where the load 15 may be an electronic device outputting voice, and the load 15 may be replaced by any other electronic device with small power; further, the excitation signal source 11 is added to the transmitting-end ultrasonic transducer 12 for excitation, and whether the load 15 works normally is observed. It should be noted that there are two definitions for normal operation, one is to charge the charging port of the load 15 and observe whether the charging rate is greater than the power consumption rate; the other is to disassemble the battery in the load 15, directly supply power to the load power supply, and observe whether the load can be normally started and operated.
The embodiment of the application provides an underwater non-contact wireless energy transmission system based on ultrasonic waves, which comprises an excitation signal source, a transmitting end ultrasonic transducer and a receiving end ultrasonic transducer, wherein the excitation signal source is used for outputting an excitation signal to the transmitting end ultrasonic transducer; the transmitting end ultrasonic transducer is used for receiving the excitation signal and converting the excitation signal into ultrasonic waves; the receiving end ultrasonic transducer is used for receiving the ultrasonic waves sent by the transmitting end ultrasonic transducer and converting the ultrasonic waves into alternating current signals; the AC-DC converter is used for receiving the alternating current signal sent by the ultrasonic transducer at the receiving end and converting the alternating current signal into a direct current signal for driving a load; and the load is used for receiving the direct current signal sent by the AC-DC converter. This application embodiment is through adopting the ultrasonic wave as energy transmission medium, owing to can carry out better propagation in aqueous as the ultrasonic wave of a mechanical wave, especially the loss is less on the energy transmission of well long distance section to can charge to the electric load high-efficiently, conveniently.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (8)

1. An ultrasonic-based underwater contactless wireless energy transfer system, comprising:
the excitation signal source is used for outputting an excitation signal to the transmitting end ultrasonic transducer;
the transmitting end ultrasonic transducer is used for receiving the excitation signal and converting the excitation signal into ultrasonic waves;
the receiving end ultrasonic transducer is used for receiving the ultrasonic waves sent by the transmitting end ultrasonic transducer and converting the ultrasonic waves into alternating current signals;
the AC-DC converter is used for receiving the alternating current electric signal sent by the receiving end ultrasonic transducer and converting the alternating current electric signal into a direct current electric signal for driving a load;
and the load is used for receiving the direct current signal sent by the AC-DC converter.
2. The ultrasonic-based underwater contactless wireless energy transfer system of claim 1, further comprising a first impedance matching network and a second impedance matching network;
the input end of the first impedance matching network is connected with the output end of the excitation signal source, the output end of the first impedance matching network is connected with the input end of the transmitting end ultrasonic transducer, and the first impedance matching network is used for adjusting the source impedance of the system;
the input end of the second impedance matching network is connected with the output end of the receiving-end ultrasonic transducer, the output end of the second impedance matching network is connected with the input end of the AC-DC converter, and the second impedance matching network is used for adjusting the load impedance of the system.
3. An ultrasound-based, underwater contactless wireless energy transfer system according to claim 2, characterized in that the source impedance of the system is:
Figure FDA0002289934750000011
α1＝-2jRe{Z22}Im{Z11}+jIm{Z12Z21}
Δ＝(2Re{Z11}Re{Z22}-Re{Z12Z21})2-|Z12Z21|2
Figure FDA0002289934750000012
Figure FDA0002289934750000013
Figure FDA0002289934750000014
Figure FDA0002289934750000021
wherein Z ismSRepresenting the source impedance, Re representing the real part of the complex number, Im representing the imaginary part of the complex number; z0Denotes a reference impedance, Z11Represents the scattering parameter S11Corresponding impedance parameter, Z12Represents the scattering parameter S12Corresponding impedance parameter, Z21Represents the scattering parameter S21Corresponding impedance parameter, Z22Represents the scattering parameter S22A corresponding impedance parameter; scattering parameter S11Representing the input reflection coefficient, scattering parameter S12Representing the backward transmission coefficient, scattering parameter S21Representing the forward transmission coefficient, scattering parameter S22Representing the output reflection coefficient.
4. An ultrasonic-based underwater contactless wireless energy transfer system according to claim 2, characterized in that the load impedance of the system is:
Figure FDA0002289934750000022
α2＝-2jRe{Z11}Im{Z22}+jIm{Z12Z21}
Δ＝(2Re{Z11}Re{Z22}-Re{Z12Z21})2-|Z12Z21|2
Figure FDA0002289934750000023
Figure FDA0002289934750000024
Figure FDA0002289934750000025
Figure FDA0002289934750000026
wherein Z ismLRepresenting the load impedance, Re representing the real part of the complex number, Im representing the imaginary part of the complex number; z0Denotes a reference impedance, Z11Represents the scattering parameter S11Corresponding impedance parameter, Z12Represents the scattering parameter S12Corresponding impedance parameter, Z21Represents the scattering parameter S21Corresponding impedance parameter, Z22Represents the scattering parameter S22A corresponding impedance parameter; scattering parameter S11Representing the input reflection coefficient, scattering parameter S12Representing the backward transmission coefficient, scattering parameter S21Representing the forward transmission coefficient, scattering parameter S22Representing the output reflection coefficient.
5. An ultrasound-based, underwater contactless wireless energy transfer system according to claim 2, characterized in that the AC-DC converter comprises a resonant type rectifier and a DC-DC converter connected in series.
6. The ultrasonic-based underwater contactless wireless energy transfer system of claim 5, wherein the resonant type rectifier comprises a bridge rectifier, a resonant inductor and a resonant capacitor;
the resonant inductor is disposed between the second impedance matching network and the bridge rectifier;
the number of the resonance capacitors is 4, and the resonance capacitors are respectively connected in parallel with two ends of 4 diodes of the bridge rectifier.
7. The ultrasonic-based subsea contactless wireless energy transfer system of claim 2, wherein the input impedance of the first impedance matching network, the output impedance of the second impedance matching network and the input impedance of the radio frequency AC-DC converter are all 50 Ω.
8. The ultrasonic-based underwater contactless wireless energy transfer system of claim 1 wherein the load is an electronic device that outputs speech.
CN201911175902.8A 2019-11-26 2019-11-26 Underwater non-contact wireless energy transmission system based on ultrasonic waves Withdrawn CN111030319A (en)

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Application publication date: 20200417