CN115021702A - Superaudio electromagnetic emission circuit - Google Patents
Superaudio electromagnetic emission circuit Download PDFInfo
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- CN115021702A CN115021702A CN202210622573.2A CN202210622573A CN115021702A CN 115021702 A CN115021702 A CN 115021702A CN 202210622573 A CN202210622573 A CN 202210622573A CN 115021702 A CN115021702 A CN 115021702A
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- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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Abstract
The invention belongs to the technical field of superaudio electromagnetism, and particularly relates to a superaudio electromagnetic transmitting circuit which comprises a resonant matching circuit and a transmitting antenna, wherein the resonant matching circuit comprises three groups of first capacitors C connected in series 1 A second capacitor C 2 And a third capacitor C 3 Said first capacitor C 1 Parallel first inductor L 1 Said first capacitor C 2 Parallel first inductor L 2 . The problems of antenna length change and resonant capacitor mismatch are solved, the slope of impedance along with frequency change is reduced, and the adaptation degree of inductance change of the long lead is improved.
Description
Technical Field
The invention belongs to the technical field of superaudio frequency electromagnetism, and particularly relates to a superaudio frequency electromagnetic transmitting circuit.
Background
Because the electric source transmitter adopts the long wire as the transmitting antenna, the inductance value of the long wire is higher, the impedance of the conventional cable is about 1.5mH/km (10 square cable), when the impedance is lower than 10kHz, the impedance is at the level of 100 ohms, when the transmitting frequency is continuously increased, the impedance is linearly increased, when the transmitting frequency is 100kHz, the impedance is increased to 1000 ohms, at the moment, the transmitting current of 1A is reached, and the transmitting voltage is not lower than 1000V. The cable is at high voltage high frequency during operation, and the insulation of cable will receive severe examination, and the distributed capacitance of cable this moment will produce great leakage current, leads to transmitting antenna's the inconsistent aggravation of electric current, and in order to improve cable dielectric strength, the insulating layer thickness that needs the increase cable simultaneously, and is unfavorable to engineering application.
In order to reduce the impedance of the transmitting antenna under the high-frequency condition, the impedance can be reduced through an LC resonance mode, when single-frequency resonance is adopted, the impedance is rapidly increased after deviating from the resonance frequency, 10 resonant capacitors are approximately required to be configured for matching under the requirement that the impedance is not more than 500 ohms according to the voltage level of 500V (the withstand voltage level of a conventional three-phase alternating current system) when the transmitting frequency range is required to be 10Hz-500kHz, and the resonant capacitors are mismatched due to the change of the length of the antenna.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a superaudio electromagnetic transmitting circuit, which solves the problems of antenna length change and resonance capacitor mismatch.
The invention is realized in such a way that the superaudio electromagnetic transmitting circuit comprises a resonant matching circuit and a transmitting antenna, wherein the resonant matching circuit comprises three groups of first capacitors C connected in series 1 A second capacitor C 2 And a third capacitor C 3 Said first capacitor C 1 Parallel first inductor L 1 Said first capacitor C 2 Parallel first inductor L 2 。
Further, the transmission frequency range includes: 100 kHz-200 kHz, 200 kHz-300 kHz, 300 kHz-400 kHz, 400 kHz-500 kHz.
Further, the first inductance L is determined from empirical values 1 And a first inductance L 2 To the first inductance L 1 And a first inductance L 2 A minimum value in the value range is assigned, and a change step length is taken as a unit to gradually increase L 2 In the process, the corresponding first capacitance C is calculated 1 A second capacitor C 2 And a third capacitor C 3 Value of when L 2 After obtaining the maximum value, the first inductance L is increased by taking the step length as the unit 1 Repeating the above process until the first inductor L 1 Obtaining the maximum value to obtain a plurality of groups of capacitance and inductance combinations; and screening the capacitance-inductance combination, and selecting the combination with the frequency stability of more than 80% in each transmission frequency range to obtain the optimal capacitance-inductance combination corresponding to each transmission frequency range.
Further, the principle of selecting the optimal combination of capacitance and inductance corresponding to each transmission frequency range satisfies: first inductance L 1 And a first inductor L 2 Always, only the first capacitor C needs to be changed when the transmitting frequency range is switched 1 A second capacitor C 2 And a third capacitor C 3 The value is obtained.
Further, calculating the corresponding first capacitance C by means of Newton iteration 1 A second capacitor C 2 And a third capacitor C 3 A value; the following formula is used:
C (k+1) ＝C (k) -[F′(C (k) )] -1 F(C (k) )
C＝(C 1 ，C 2 ，C 3 ) T
F＝(f 1 ，f 2 ，f 3 ) T
k is iteration number, the initial value C (0) is substituted, and the first capacitor C is solved through successive iteration 1 A second capacitor C 2 And a third capacitor C 3 The value of (c).
Compared with the prior art, the invention has the beneficial effects that: the method of the invention provides multi-resonance emission in a wide frequency band range, and through multi-resonance design, the frequency range below 500 ohms can reach 150kHz, 3 groups of resonance networks are configured to cover the frequency range of 500kHz, and simultaneously, the slope of impedance along with frequency change is reduced, and the adaptation degree of inductance change of a long wire is improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present invention;
FIG. 2 is a graph of impedance versus frequency for single frequency resonance and multiple frequency resonance;
fig. 3 impedance curves from 0-500kHz at a transmit antenna inductance of 0.5mH (piecewise impedance matching).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a super-audio frequency electromagnetic transmitting circuit, which is capable of transmitting in a multi-resonance wide frequency band range, and by means of a multi-resonance design, a frequency range of 500 ohms can reach 150kHz, and a frequency range of 500kHz can be covered by configuring 3 sets of resonant networks, and at the same time, the slope of impedance along with frequency change is reduced, and the adaptation degree of inductance change of a long wire is improved.
The resonant matching circuit structure includes: the resonant matching circuit comprises three groups of first capacitors C connected in series 1 A second capacitor C 2 And a third capacitor C 3 The first electricityContainer C 1 Parallel first inductor L 1 Said first capacitor C 2 Parallel first inductor L 2 。
Referring to fig. 1, according to the schematic diagram of the circuit, the total impedance Z of the load system of the present circuit can be determined by the following formula (1):
where ω is the transmit waveform angular frequency and "//" represents parallel. As can be seen from the fundamental principle of resonance, the capacitive reactance and the inductive reactance in the circuit need to be equal in magnitude, opposite in phase, and suppressed from each other. At this time, the total impedance of the circuit is the coil internal resistance R 0 And the aim of integral resonance of the circuit is fulfilled. Namely:
formula (2): z ═ R 0
The following relation can be obtained by the above two formulas: formula (3):
ω 6 (L 1 L 2 L 3 C 1 C 2 C 3 )-ω 4 (L 1 L 2 C 2 C 3 +L 2 L 3 C 2 C 3 +L 1 L 2 C 1 C 3 +L 1 L 2 C 1 C 2 )+ω 2 (L 1 C 3 +L 2 C 3 +L 2 C 2 +L 3 C 3 +L 1 C 1 )-1＝0
equation (3) can find that the equation has more than one solution. Therefore, the matching circuit can realize multi-frequency point resonance.
The transmission frequency range of 100 kHz-500 kHz is divided into the following ranges: 100 kHz-200 kHz, 200 kHz-300 kHz, 300 kHz-400 kHz, 400 kHz-500 kHz. Determining the capacitance inductance value corresponding to each transmission frequency range:
determining the first inductance L from empirical values 1 And a first inductance L 2 To the first inductance L 1 And a first inductance L 2 A minimum value in the value range is assigned, and a change step length is taken as a unit to be gradually increasedLarge L 2 In the process, the corresponding first capacitance C is calculated 1 A second capacitor C 2 And a third capacitor C 3 Value of when L 2 After obtaining the maximum value, the first inductance L is increased by taking the step length as the unit 1 Repeating the above process until the first inductor L 1 Obtaining the maximum value to obtain a plurality of groups of capacitance and inductance combinations; and screening the capacitance-inductance combination, and selecting the combination with the frequency stability of more than 80% in each transmission frequency range to obtain the optimal capacitance-inductance combination corresponding to each transmission frequency range.
Calculating a corresponding first capacitance C by means of Newton iteration 1 A second capacitor C 2 And a third capacitor C 3 A value; the following formula is used:
C (k+1) ＝C (k )-[F′(C (k) )] -1 F(C (k) )
C＝(C 1 ，C 2 ，C 3 ) T
F＝(f 1 ，f 2 ，f 3 ) T
k is iteration number, the initial value C (0) is substituted, and the first capacitor C is solved through successive iteration 1 A second capacitor C 2 And a third capacitor C 3 The value of (c).
Selecting corresponding ones of the transmission frequency rangesThe principle of the optimal capacitance-inductance combination satisfies: first inductance L 1 And a first inductor L 2 Always, only the first capacitance C needs to be changed when the transmitting frequency range is switched 1 A second capacitor C 2 And a third capacitor C 3 The value is obtained. Furthermore, a combination of parameters with only one different capacitance can be chosen, so that only one device parameter can be changed for each frequency range switching during tuning.
Referring to fig. 2, the impedance variation curve with frequency is compared between single-frequency resonance and multi-frequency resonance, and the impedance variation using the present invention is smaller than that of single-frequency resonance.
By adopting the multi-frequency resonance scheme of the invention in the ranges of 100 kHz-200 kHz, 200 kHz-300 kHz, 300 kHz-400 kHz and 400 kHz-500 kHz, only one device parameter is changed when each frequency range is switched. The impedance curve of the final system is shown in fig. 3.
According to the graph shown in fig. 3, within the transmission frequency range of 10Hz to 500kHz, the load impedance of the antenna is not more than 500 ohms, and the high-frequency transmission current can be ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A superaudio electromagnetic transmitting circuit is characterized by comprising a resonant matching circuit and a transmitting antenna, wherein the resonant matching circuit comprises three groups of first capacitors C connected in series 1 A second capacitor C 2 And a third capacitance C 3 Said first capacitor C 1 Parallel first inductor L 1 Said first capacitor C 2 Parallel first inductor L 2 。
2. The superaudio electromagnetic transmission circuit of claim 1, wherein the transmission frequency range comprises: 100 kHz-200 kHz, 200 kHz-300 kHz, 300 kHz-400 kHz, 400 kHz-500 kHz.
3. Superaudio electromagnetic transmission circuit according to claim 2, wherein the first inductance L is determined based on empirical values 1 And a first inductance L 2 To the first inductance L 1 And a first inductance L 2 A minimum value in the value range is assigned, and a change step length is taken as a unit to gradually increase L 2 In the process, the corresponding first capacitance C is calculated 1 A second capacitor C 2 And a third capacitor C 3 Value of when L 2 After obtaining the maximum value, the first inductance L is increased by taking the step length as the unit 1 Repeating the above process until the first inductor L 1 Obtaining the maximum value to obtain a plurality of groups of capacitance and inductance combinations; and screening the capacitance-inductance combination, and selecting the combination with the frequency stability of more than 80% in each transmission frequency range to obtain the optimal capacitance-inductance combination corresponding to each transmission frequency range.
4. The superaudio electromagnetic transmission circuit of claim 3, wherein the principle of selecting the optimum combination of capacitance and inductance for each transmission frequency range satisfies the following: first inductance L 1 And a first inductor L 2 Always, only the first capacitance C needs to be changed when the transmitting frequency range is switched 1 A second capacitor C 2 And a third capacitor C 3 The value is obtained.
5. Superaudio electromagnetic transmit circuit according to claim 3, wherein the respective first capacitance C is calculated by means of Newton's iterations 1 A second capacitor C 2 And a third capacitor C 3 A value; the following formula is used:
C (k+1) ＝C (k) -[F′(C (k) )] -1 F(C (k) )
C＝(C 1 ，C 2 ，C 3 ) T
F＝(f 1 ，f 2 ，f 3 ) T
k is iteration number, the initial value C (0) is substituted, and the first capacitor C is solved through successive iteration 1 A second capacitor C 2 And a third capacitor C 3 The value of (c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210622573.2A CN115021702A (en) | 2022-06-01 | 2022-06-01 | Superaudio electromagnetic emission circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210622573.2A CN115021702A (en) | 2022-06-01 | 2022-06-01 | Superaudio electromagnetic emission circuit |
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| CN115021702A true CN115021702A (en) | 2022-09-06 |
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| CN202210622573.2A Pending CN115021702A (en) | 2022-06-01 | 2022-06-01 | Superaudio electromagnetic emission circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101501991A (en) * | 2006-06-27 | 2009-08-05 | 传感电子公司 | Resonant circuit tuning system with dynamic impedance matching |
| CN110085972A (en) * | 2019-05-06 | 2019-08-02 | 中国科学院地质与地球物理研究所 | A kind of antenna transmission circuit with brill orientation electromagnetic wave resistivity logging instrument |
| AU2020103024A4 (en) * | 2020-10-27 | 2020-12-24 | Institute Of Geology And Geophysics Chinese Academy Of Sciences (Iggcas) | Antenna Transceiving Device of Orientation-while-drilling Electromagnetic Wave Resistivity Logging Instrument |
| CN112937319A (en) * | 2021-02-24 | 2021-06-11 | 余以虎 | Multi-frequency resonance compensation-based multi-channel wireless charging system for intelligent mobile restaurant |
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2022
- 2022-06-01 CN CN202210622573.2A patent/CN115021702A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101501991A (en) * | 2006-06-27 | 2009-08-05 | 传感电子公司 | Resonant circuit tuning system with dynamic impedance matching |
| CN110085972A (en) * | 2019-05-06 | 2019-08-02 | 中国科学院地质与地球物理研究所 | A kind of antenna transmission circuit with brill orientation electromagnetic wave resistivity logging instrument |
| AU2020103024A4 (en) * | 2020-10-27 | 2020-12-24 | Institute Of Geology And Geophysics Chinese Academy Of Sciences (Iggcas) | Antenna Transceiving Device of Orientation-while-drilling Electromagnetic Wave Resistivity Logging Instrument |
| CN112937319A (en) * | 2021-02-24 | 2021-06-11 | 余以虎 | Multi-frequency resonance compensation-based multi-channel wireless charging system for intelligent mobile restaurant |
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