CN109560619B - Frequency setting method for realizing penetrating metal energy transmission by utilizing piezoelectric ceramics - Google Patents
Frequency setting method for realizing penetrating metal energy transmission by utilizing piezoelectric ceramics Download PDFInfo
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- CN109560619B CN109560619B CN201811490824.6A CN201811490824A CN109560619B CN 109560619 B CN109560619 B CN 109560619B CN 201811490824 A CN201811490824 A CN 201811490824A CN 109560619 B CN109560619 B CN 109560619B
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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
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Abstract
The invention relates to a frequency setting method for realizing energy transmission of penetrating metal by utilizing piezoelectric ceramics, which comprises the following steps: 1) setting a frequency modulation starting frequency, a frequency modulation ending frequency and a stepping interval; 2) the system starts from the initial frequency, and obtains the power of a first maximum value and the frequency corresponding to the extreme value through power detection; 3) obtaining first minimum value power after the first maximum value power and the frequency corresponding to the minimum value power through power detection; 4) calculating the thickness of the metal barrier plate; 5) calculating all frequency points which meet the condition that the thickness of the metal baffle is integral multiple of the half-wavelength of the sound wave according to the thickness of the metal baffle and the sound velocity in the metal baffle; 6) detecting the maximum power value corresponding to all frequency points in the frequency modulation range by power, and storing the maximum power and the optimal working frequency corresponding to the maximum power in the system; 7) the system operates at an optimum operating frequency corresponding to the maximum power and supplies power to the load at the maximum power. Compared with the prior art, the method has the advantages of realizing the charging of the load by the maximum power and the like.
Description
Technical Field
The invention relates to the technical field of wireless energy transmission, in particular to a frequency setting method for realizing penetrating metal energy transmission by utilizing piezoelectric ceramics.
Background
Conventionally, drilling and wiring are the main methods for realizing energy transmission by penetrating metal shells such as underwater weapons, underwater vehicles, surface ships, aerospace equipment, nuclear energy equipment, oil pipelines and the like. However, the drilling and wiring method inevitably damages the tightness of the metal structure, and reduces the use and protection efficiency of the metal shell to personnel and important equipment.
Due to the strong faraday shielding effect of the metal housing, energy transmission methods based on electromagnetic waves, inductive coupling, capacitive coupling and other techniques are difficult to apply. Because mechanical waves can penetrate through metal elastic media, and piezoelectric materials can realize the interconversion of electrical signals and mechanical waves with higher efficiency, people propose the technology of utilizing piezoelectric transducers to realize energy transmission through metal.
Although the current piezoelectric energy transmission technology is widely applied to the realization of wireless energy by penetrating metal, for the same kind of transducer and the optimal resonance frequency points of different individuals, the optimal frequency points are not completely consistent due to slight differences of manufacturing processes and materials. For the same pair of piezoelectric ceramic transducers coupled to the metal shadow mask, the resonant frequency point after installation will also shift. The optimum resonance frequency point of the transducer is not a certain value.
In addition, during transmission of penetrating metal energy, incident sound waves are reflected and transmitted at the interface of the transducer and the metal connection due to acoustic impedance mismatch between the metal baffle and the transducer. When the thickness of the metal baffle is even multiple (integral multiple of half wavelength) of the wave length of the sound wave 1/4, the transmission intensity is maximum; the transmission intensity is minimal when the metal shadow mask thickness is an odd multiple of the wavelength of the acoustic wave 1/4.
In practical application scenes, the types of the metal baffles are different on different occasions, the ambient temperatures are different, and the sound velocity of sound waves in the metal is different, so that the sound wave wavelengths are different. For the same metal baffle plate, even if the acoustic wave wavelength is the same, the thickness of the metal baffle plate is different under the same temperature, and the condition that the thickness of the metal baffle plate is just the integral multiple relation of half-wavelength of the wavelength corresponding to the optimal resonance frequency point of the transducer can not be met.
In summary, the research on the high-efficiency charging method of automatic frequency modulation penetrating through different types and thicknesses of metal baffles at different temperatures is urgent.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a frequency setting method for realizing energy transmission of penetrating metal by utilizing piezoelectric ceramics, which is used for solving the problem that the thickness of a metal display plate is integral multiple of the half wavelength of sound wave in the process of charging a load when ultrasonic waves penetrate through metal shadow masks of different types and different thicknesses at different environmental temperatures, and realizing the maximum efficiency of a system for charging the load.
The purpose of the invention can be realized by the following technical scheme:
a frequency setting method for realizing penetrating metal energy transmission by utilizing piezoelectric ceramics comprises the following steps:
1) setting the frequency modulation starting frequency f according to the optimal resonance frequency of the transducer and the frequency band after broadband impedance matching1End frequency f2And a step interval Δ f;
2) the system starts from the initial frequency, steps frequency modulation in the frequency band range according to step intervals, and obtains the power P of the first maximum value through power detectionmax1Frequency f corresponding to the extreme valuemax1；
3) The system obtains a first minimum power P after the first maximum power through power detectionmin1And the minimum power corresponds to the frequency fmin1；
4) According to frequency f corresponding to maximum powermax1Frequency f corresponding to the power of minimum valuemin1Calculating the thickness d of the metal barrier plate;
5) the system calculates all frequency points f meeting the condition that the thickness of the metal baffle is integral multiple of the half wavelength of sound wave according to the thickness d of the metal baffle and the sound velocity upsilon in the metal bafflemax n；
6) All frequency points f in power detection frequency modulation rangemax nCorresponding maximum power value Pmax nThe maximum power Pmax＝max{Pmax1,Pmax2...Pmax nAnd its corresponding optimum working frequency fmaxStoring in the system;
7) the system works at the optimum working frequency f corresponding to the maximum powermaxAnd at maximum power PmaxPower is supplied to the load.
Preferably, said fmax1The method is obtained by step frequency modulation, gradual convergence adjustment and testing by a power detection circuit.
Preferably, said fmin1The method is obtained by step frequency modulation, gradual convergence adjustment and testing by a power detection circuit.
Preferably, the thickness d of the metal shadow mask is calculated as follows:
and solving through the two equations to obtain the acoustic wave.
Preferably, all frequency points f meeting the condition that the thickness of the metal baffle is integral multiple of the half wavelength of the sound wave are calculated according to the thickness d of the metal baffle and the sound velocity upsilon in the metal bafflemax n
Wherein n is 1,2,3, upsilon is the sound velocity in the metal baffle, n is the number of half-wave wavelengths of sound waves in the metal baffle, and d is the thickness of the metal baffle.
Preferably, said optimum operating frequency fmaxThe selection mechanism is that a plurality of frequency points f meet the condition that the thickness of the metal baffle is integral multiple of the half wavelength of the sound wavemax nAnd comparing corresponding power values.
Compared with the prior art, the invention adopts ultrasonic waves as a carrier for transmitting energy by penetrating through the metal baffle plate, adaptively adjusts the optimal charging frequency according to the material and thickness of the metal plate, the ambient temperature and the like, and realizes the purpose of charging the load by the maximum power.
Drawings
Fig. 1 is a schematic block diagram of a circuit embodying the present invention.
Fig. 2 is a schematic diagram of the propagation of an acoustic signal in an energy channel.
FIG. 3 is a graph of the results of S parameter tests for sonic penetration of a 12mm metal aluminum plate.
FIG. 4 is a simplified flow chart of a frequency setting method for achieving energy transmission through metal by using piezoelectric ceramics according to the present invention.
Reference numerals
1. Signal generator 2, preceding stage operational amplifier 3, power amplifier 4, broadband impedance matching
5. Transmitting transducer 6, metal baffle 7, receiving transducer 8, broadband impedance matching
9. Full-bridge rectification 10, load 11, MCU controller 12 and power detection circuit
13. Coupling agent
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The schematic block diagram of the circuit shown in fig. 1 includes a transmitting end, an energy channel and a receiving end. The transmitting end MCU controls the signal generator to generate continuous carrier waves, the continuous carrier waves are subjected to primary amplification and power amplification to complete impedance matching, and the matched electric signals are loaded to the transmitting transducer and are transmitted to the receiving transducer through the energy channel. The power detection system internally transmits energy with maximum efficiency for implementing the automatic frequency modulation of the present invention. At a receiving end, the power signal is picked up by a receiving transducer, matched by a connecting impedance, rectified and filtered by a full bridge, and used for supplying power for an internal load.
The propagation of the acoustic signal in the energy channel is schematically illustrated in fig. 2. In the process of transmitting energy by penetrating through the metal baffle, incident sound waves are reflected and transmitted at the interface of the receiving transducer and the metal connection due to the fact that the acoustic impedance of the metal baffle is not matched with that of the transducer. The direction of the reflected wave is opposite to that of the incident wave, the reflected wave is transmitted to the interface of the transmitting transducer and the metal baffle plate and can be reflected again, and multipath effect can exist in multiple reflections. The transmitted wave signal is transmitted directly into the receiving transducer.
The result of the S parameter test of the 12mm aluminum metal shadow mask penetrated by sound waves is shown in FIG. 3. The network analyzer is in 100KHz-2MHz, and a sweep-frequency electric signal passes through 12mm gold by the transducerAfter the mask is closed, the distribution characteristic of signal amplitude along with frequency, S11Is the reflection coefficient, S21Is the forward transmission coefficient. S at the frequency doubling point of which the thickness of the metal baffle meets the requirement that the thickness of the metal baffle is an even number of the wave length of the sound wave 1/421Very large, S11Are small; s at the point that the thickness of the metal baffle meets the requirement that the thickness of the metal baffle is an odd number of frequency doubling of the sound wave 1/4 wavelength21Very small, S11Is very large;
fig. 4 is a simplified flow chart of a frequency setting method for achieving energy transmission through metal by using piezoelectric ceramics according to the present invention. The method comprises the following steps:
1) setting the frequency modulation starting frequency f according to the optimal resonance frequency of the transducer and the frequency band after broadband impedance matching1End frequency f2And a step interval Δ f;
2) the system starts from the initial frequency, steps frequency modulation in the frequency band range according to step intervals, and obtains the power P of the first maximum value through power detectionmax1Frequency f corresponding to the extreme valuemax1；
3) The system obtains a first minimum power P after the first maximum power through power detectionmin1And the minimum power corresponds to the frequency fmin1；
4) According to frequency f corresponding to maximum powermax1Frequency f corresponding to the power of minimum valuemin1Calculating the thickness d of the metal barrier plate;
5) the system calculates all frequency points f meeting the condition that the thickness of the metal baffle is integral multiple of the half wavelength of sound wave according to the thickness d of the metal baffle and the sound velocity upsilon in the metal bafflemax n；
6) All frequency points f in power detection frequency modulation rangemax nCorresponding maximum power value Pmax nThe maximum power Pmax＝max{Pmax1,Pmax2...Pmax nAnd its corresponding optimum working frequency fmaxStoring in the system;
7) the system works at the optimum working frequency f corresponding to the maximum powermaxAnd at maximum power PmaxPower is supplied to the load.
Wherein f ismax1、fmin1The method is obtained by step frequency modulation, gradual convergence adjustment and testing by a power detection circuit.
The thickness d is calculated as follows:
wherein the optimum operating frequency fmaxThe selection mechanism is that a plurality of frequency points f meet the condition that the thickness of the metal baffle is integral multiple of the half wavelength of the sound wavemax nAnd comparing corresponding power values.
Wherein f ismax nThe calculation method of (2) is as follows:
the invention adopts ultrasonic wave as a carrier for transmitting energy by penetrating through the metal baffle plate, and adaptively adjusts the optimal charging frequency according to the material and thickness of the metal plate, the ambient temperature and the like. The problem that the thickness of the metal baffle cannot be completely matched with the integral multiple of the half-wavelength of sound waves at the optimal resonance frequency point of the transducer in different application occasions is solved, and the thickness of the metal baffle is the integral multiple of the half-wavelength of the sound waves through automatic frequency modulation in a broadband matching frequency band range. The maximum power is charged for the load, the energy consumption of the system is saved, and the charging efficiency is improved.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A frequency setting method for realizing penetrating metal energy transmission by utilizing piezoelectric ceramics is characterized by comprising the following steps:
1) setting the frequency modulation starting frequency f according to the optimal resonance frequency of the transducer and the frequency band after broadband impedance matching1End frequency f2And a step interval Δ f;
2) the system starts from the initial frequency, steps frequency modulation in the frequency band range according to step intervals, and obtains the power P of the first maximum value through power detectionmax1Frequency f corresponding to the maximum powermax1；
3) The system obtains a first minimum power P after the first maximum power through power detectionmin1And the minimum power corresponds to the frequency fmin1；
4) According to frequency f corresponding to maximum powermax1Frequency f corresponding to the power of minimum valuemin1Calculating the thickness d of the metal barrier plate;
5) the system calculates all frequency points f meeting the condition that the thickness of the metal baffle is integral multiple of the half wavelength of sound wave according to the thickness d of the metal baffle and the sound velocity upsilon in the metal bafflemaxn；
6) All frequency points f in power detection frequency modulation rangemaxnCorresponding maximum power value PmaxnThe maximum power Pmax＝max{Pmax1,Pmax2...PmaxnAnd its corresponding optimum working frequency fmaxStoring in the system;
7) the system works at the optimum working frequency f corresponding to the maximum powermaxAnd at maximum power PmaxSupplying power to a load;
the thickness d of the metal shadow mask is calculated as follows:
wherein upsilon is the sound velocity in the metal baffle, n is the number of half-wave wavelengths of sound waves in the metal baffle, and d and n are unknowns to be solved, and the unknowns are obtained by solving the two equations;
calculating all frequency points f meeting the condition that the thickness of the metal baffle is integral multiple of the half wavelength of the sound wave according to the thickness d of the metal baffle and the sound velocity upsilon in the metal bafflemaxn
Wherein n is 1,2,3, upsilon is the sound velocity in the metal baffle, n is the number of half-wave wavelengths of sound waves in the metal baffle, and d is the thickness of the metal baffle.
2. The method of claim 1, wherein f is a frequency setting factor of energy transmission through metal using piezoelectric ceramicsmax1The method is obtained by step frequency modulation, gradual convergence adjustment and testing by a power detection circuit.
3. The method of claim 1, wherein f is a frequency setting factor of energy transmission through metal using piezoelectric ceramicsmin1The method is obtained by step frequency modulation, gradual convergence adjustment and testing by a power detection circuit.
4. The method as claimed in claim 1, wherein the optimal operating frequency f is set by using a piezoelectric ceramic to transmit energy through the metalmaxThe selection mechanism is that a plurality of frequency points f meet the condition that the thickness of the metal baffle is integral multiple of the half wavelength of the sound wavemaxnAnd comparing corresponding power values.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406611A (en) * | 2015-10-28 | 2016-03-16 | 中国人民解放军国防科学技术大学 | Device and method of determining through-metal wall ultrasonic sound wireless energy transmission channel optimization frequency |
| CN106253499A (en) * | 2016-08-17 | 2016-12-21 | 桐城市闲产网络服务有限公司 | A kind of novel ultrasound wave Contactless Power Transmission System based on PZT |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY154347A (en) * | 2007-12-21 | 2015-05-29 | Access Business Group Int Llc | Circuitry for inductive power transfer |
| WO2015196290A1 (en) * | 2014-06-25 | 2015-12-30 | Dalhousie University | Power links and methods for improved efficiency |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406611A (en) * | 2015-10-28 | 2016-03-16 | 中国人民解放军国防科学技术大学 | Device and method of determining through-metal wall ultrasonic sound wireless energy transmission channel optimization frequency |
| CN106253499A (en) * | 2016-08-17 | 2016-12-21 | 桐城市闲产网络服务有限公司 | A kind of novel ultrasound wave Contactless Power Transmission System based on PZT |
Non-Patent Citations (1)
| Title |
|---|
| Modeling and Evaluation on through-metal Power Transfer Using Piezoelectric Transducer;Falong Huang等;《2018 10th International Conference on Wireless Communications and Signal Processing (WCSP)》;20181103;全文 * |
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