CN106160252B - Transmitting terminal of wireless power transmission system - Google Patents
Transmitting terminal of wireless power transmission system Download PDFInfo
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- CN106160252B CN106160252B CN201510179537.3A CN201510179537A CN106160252B CN 106160252 B CN106160252 B CN 106160252B CN 201510179537 A CN201510179537 A CN 201510179537A CN 106160252 B CN106160252 B CN 106160252B
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Abstract
The invention discloses a wireless power transmission system transmitting terminal, which comprises: the circuit comprises an input end, a first inductor, a second inductor and a first capacitor; two ends of the first inductor are connected with the input end, one end of the second inductor is connected with the first pole plate of the first capacitor, and the other end of the first inductor is grounded; the input end of the wireless power transmission transmitting end receives low-frequency current, the first inductor and the second inductor are mutually inductive, the second inductor, the sixth inductor and the first capacitor generate resonance, and the current is transmitted to the ground through the grounding end. The invention increases the frequency of the low-frequency electricity, transmits the low-frequency electricity through the resonant circuit, and takes the earth as a conductor to realize local power transmission which can be achieved by any land energy on the earth, thereby realizing industrial-grade wireless power transmission. The invention effectively reduces the power transmission cost.
Description
Technical Field
The invention relates to a transmitting terminal of a wireless power transmission system, and belongs to the technical field of electric power.
Background
The electric power system converts the primary energy of the nature into electric energy through a power generation power device (mainly comprising a boiler, a steam turbine, a generator, an auxiliary production system of a power plant and the like), supplies the electric energy to each load center through a power transmission system, a power transformation system and a power distribution system, and converts the electric energy into energy of different forms such as power, heat, light and the like through various devices, thereby serving regional economy and people life.
The power system is mainly composed of: the power generation, transformation, transmission, distribution, power utilization and the like. A number of techniques to be improved are incorporated in each part of the power system. The power transmission part is an intermediate part of the power system and is an important part of the power system, and is closely connected with all aspects of the power system and is an important link for energy generation, transmission and management. Power plants and electrical load centers are typically located in different areas. A power plant is built in a place with proper conditions of primary energy resources such as water power and coal, and electric energy can be transmitted to a load center far away from the power plant through power transmission, so that the development and utilization of the electric energy exceed the limit of regions.
At present, power transmission is classified into ac power transmission and dc power transmission according to the nature of the transmission current. Dc transmission was first successfully achieved in the 80's of the 19 th century. However, the voltage of the dc transmission is difficult to increase continuously under the current technical conditions, so that the transmission capacity and the efficiency are limited. At the end of the 19 th century, direct current transmission was gradually replaced by alternating current transmission. The success of alternating current transmission has already met a new era in the electrified society of the 20 th century. The direct current transmission has new development since the 60 s of the 20 th century, and is matched with the alternating current transmission to form an alternating current and direct current hybrid power system.
The traditional electric energy transmission mainly depends on a conducting wire or a conductor for transmission, and a large number of conducting wires, towers, transformation equipment and current conversion equipment are used in complicated links of power generation, power transmission and power utilization, and the daily maintenance of a power grid is also indiscernible. Wireless power transmission is used as a special power transmission mode, power energy is transmitted by radio, and various links in the power transmission process are omitted, so that electric energy is more economical. Compared with traditional power transmission, the wireless power transmission has the outstanding advantages in specific occasions and has a very good development prospect. However, the conventional wireless power transmission method only realizes short-distance and low-energy power transmission (wireless charging and the like), but high-energy power transmission is not realized yet in a long distance, and various difficulties need to be overcome.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to realize long-distance wireless power transmission.
To achieve the above object, the present invention provides a transmitting terminal of a wireless power transmission system, which transmits a current to a receiving terminal of the wireless power transmission system through the earth, wherein,
the wireless transmission transmitting terminal comprises: the circuit comprises an input end, a first inductor, a second inductor and a first capacitor;
two ends of the first inductor are connected with the input end, one end of the second inductor is connected with a first polar plate of the first capacitor, and the other end of the second inductor is grounded;
the input end of the wireless power transmission transmitting end receives very low frequency current, the first inductor and the second inductor are mutually inductive, the second inductor and the first capacitor generate resonance, and the current is transmitted to the ground through the grounding end.
Preferably, the wireless power transmission system further comprises a booster circuit connected between the input end and the wireless power transmission transmitting end for boosting the power transmission voltage.
Preferably, the wireless power transmission transmitting terminal further comprises an up-conversion circuit;
the frequency raising circuit is connected between the input end of the wireless power transmission transmitting end and the generator and is used for raising the frequency of the low-frequency current sent by the generator to the very low-frequency current.
Preferably, the frequency boost circuit comprises: a third capacitor and a first electric high-frequency igniter;
the first pole of the third capacitor is connected with the first end of the input end of the wireless power transmission transmitting end, the second pole of the third capacitor is connected with the second end of the input end of the wireless power transmission transmitting end, and the second end of the first electric high-frequency igniter is connected with the first end of the first inductor.
Preferably, the wireless power transmission transmitting terminal further comprises a fifth inductor and a sixth inductor;
the fifth inductor is connected with the first inductor in series; the sixth inductor is connected in series with the two inductors.
Preferably, the wireless power transmission transmitting terminal is further provided with a first overcurrent protection unit, and the first overcurrent protection unit is arranged between the generator and the input end of the wireless power transmission transmitting terminal.
Preferably, the first pole of the first capacitor is a spherical electrode or a ring electrode, and the first electrode of the first capacitor and the ground form a first capacitor.
According to the transmitting terminal of the wireless power transmission system, the low-frequency power is transmitted out through the resonant circuit after being increased in frequency, the ground is used as a conductor, local power transmission which can be achieved by any land energy on the earth is achieved, and industrial-grade wireless power transmission is realized. The wireless power transmission system provided by the invention effectively reduces the power transmission cost.
Drawings
Fig. 1 is a schematic diagram of the power transmission principle of the transmitting end of the wireless power transmission system of the invention;
FIG. 2 is a schematic diagram of a boost circuit added to a transmitting terminal of the wireless power transmission system according to the present invention;
FIG. 3 is a schematic diagram of a frequency increasing circuit added to the transmitting terminal of the wireless power transmission system according to the present invention;
fig. 4a and 4b are schematic diagrams of the structure of the circuit of adding an inductor at the transmitting end of the wireless power transmission system according to the present invention;
FIG. 5 is a schematic diagram of the structure of the wireless power transmission system with an overcurrent protection circuit added at the transmitting end;
fig. 6 is a schematic diagram of a spherical electrode at the transmitting end of the wireless power transmission system.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the present invention provides a transmitting terminal of a wireless power transmission system, which includes a wireless power transmission transmitting terminal and a wireless power transmission receiving terminal; the wireless transmission transmitting terminal transmits current to the wireless transmission receiving terminal through the ground, wherein the wireless transmission transmitting terminal comprises: the circuit comprises an input end, a first inductor, a second inductor and a first capacitor; two ends of the first inductor are connected with the input end, one end of the second inductor is connected with the first pole plate of the first capacitor, and the other end of the second inductor is grounded; the input end of the wireless power transmission transmitting end receives very low frequency current, the first inductor and the second inductor are mutually inductive, the second inductor and the first capacitor generate resonance, and the current is transmitted to the ground through the grounding end. The following is a detailed description of the transmitting terminal of the wireless power transmission system provided by the present invention.
As shown in fig. 2, in order to further reduce the circuit loss during power transmission, a booster circuit is further provided at the wireless power transmission transmitting end. The booster circuit is connected between the input terminal and the wireless power transmission transmitting terminal for boosting the power transmission voltage.
As shown in fig. 3, according to the transmission principle of electromagnetic waves, in the present invention, air is used as a communication medium for electromagnetic wave propagation on the ground, which has almost no loss, and the frequency of the electromagnetic waves can be selected from high frequency and ultra high frequency, so that the radiation efficiency is high, the physical size of the antenna is short, and the volume is small. The electromagnetic wave penetrating the stratum is transmitted in the coal seam and rock stratum with large loss, and the working frequency must be reduced to a very low frequency band (VLF) or even an audio frequency band (VF) to have certain penetrating power. As can be seen from the expression "Π Λ p" in the amplitude attenuation constant, the lower the frequency of the electromagnetic wave, the smaller the conductivity p of the medium, the slower the attenuation speed, and the more favorable the energy transfer. Whereas the electricity generated by existing generator sets is 50 Hz. Such low frequencies are susceptible to interference during ground transmission, which is detrimental to the long-distance transmission of electrical energy. In order to enable low-frequency electricity generated by the existing low-frequency generator set to be transmitted through the wireless power transmission system provided by the invention on the premise of not changing the existing low-frequency generator set, a frequency boosting circuit is required to be arranged between a generator and the wireless power transmission system, and the frequency boosting circuit is used for boosting the low-frequency electricity generated by the generator set to very low frequency and then enters the wireless power transmission system through the input end of the wireless power transmission transmitting end. The frequency boosting circuit comprises a third capacitor and a first electric power high-frequency igniter, a first pole of the third capacitor is connected with a first end of an input end of the wireless power transmission transmitting end in a high-frequency mode and is connected with a first end of the first electric power high-frequency igniter, a second pole of the third capacitor is connected with a second end of the input end of the wireless power transmission transmitting end, and a second end of the first electric power high-frequency igniter is connected with a first end of a first inductor.
As shown in fig. 4a, in order to further ensure that the transmitting terminal of the wireless power transmission system is suitable for being used in different regional conditions and adjusting the second inductance under different regional conditions, a first inductance adjusting circuit may be disposed at the transmitting terminal of the wireless power transmission, where the first inductance adjusting circuit includes a sixth inductance; the sixth inductor is connected in series with the two inductors. In the present invention, the sixth inductor is preferably an adjustable inductor.
As shown in fig. 4b, in order to further ensure that the transmitting terminal of the wireless power transmission system is suitable for being used in different regional conditions, and the first inductor and the second inductor are adjusted in different regional conditions, a first inductor adjusting circuit may be disposed at the transmitting terminal of the wireless power transmission system, where the first inductor adjusting circuit includes a fifth inductor and a sixth inductor; the fifth inductor is connected with the first inductor in series; the sixth inductor is connected in series with the two inductors. The invention can be tuned by the adjustable inductor according to the change of the impedance so as to adapt to wireless power transmission under different regional conditions.
As shown in fig. 5, in order to further ensure the safety of the transmitting end of the wireless power transmission system, a first overcurrent protection unit is further disposed at the transmitting end of the wireless power transmission system, and the first overcurrent protection unit is disposed between the generator and the input end of the transmitting end of the wireless power transmission system.
As shown in fig. 6, the first capacitor is a spherical electrode or a ring electrode, and the first electrode of the first capacitor and the ground form a first capacitor. The spherical electrode or the annular electrode is more stable relative to a planar electrode when being installed in the field, and the spherical electrode is superior to the annular electrode.
According to the transmitting terminal of the wireless power transmission system, energy is transmitted through the very low frequency current, the very low frequency wireless transmission is similar to the single-wire power transmission principle, and the wire parameters of single-wire power transmission can be equivalent to a resistor and a reactance finally. The invention uses the earth as a conductor, and the earth is equivalent to a single lead.
The address of the transmitting terminal provided by the invention can be arbitrarily selected, and the oscillation factor frequency of the transmitting terminal is equal to the sum of the earth and the oscillation factor frequency of the receiving terminal. Taking the area of Lichuan Hubei as an example, if a single phase transmits 2 megawatts of electricity, the transmission frequency is 20kh, the distance is 3.75 kilometers, the voltage of each phase is 220kv, the equivalent resistance is 243 ohms, the earth is equivalent to a single line with the effective current of about 15.7 amperes and the loss of about 3 percent. For the invention, because the electric energy is converted into the very low frequency current by the transmitting terminal, when the very low frequency current is transmitted by the earth as a conductor for transmitting the electric energy, the influence of the impedance between the transmitting terminal and the receiving terminal and the geographical distance between the transmitting terminal and the receiving terminal is small, and the small change can be solved in tuning. The earth is equivalent to impedance during tuning, no matter how far the transmitting end and the receiving end are. Therefore, no matter how far the power transmission distance is, the power transmission system provided by the invention is superior to the existing power transmission mode in power transmission.
In summary, the transmitting terminal of the wireless power transmission system provided by the invention increases the frequency of the low-frequency power, and transmits the low-frequency power through the resonant circuit, and the ground itself is used as a conductor, so that the local power transmission which can be achieved by any land energy on the earth is realized, and the industrial-grade wireless power transmission is realized. The transmitting terminal of the wireless power transmission system provided by the invention effectively reduces the power transmission cost.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (5)
1. A transmitting terminal of a wireless power transmission system, characterized in that the wireless power transmission transmitting terminal transmits current to a wireless power transmission receiving terminal through the earth, wherein,
the wireless transmission transmitting terminal includes: the circuit comprises an input end, a first inductor, a second inductor and a first capacitor;
two ends of the first inductor are connected with the input end, one end of the second inductor is connected with a first polar plate of the first capacitor, and the other end of the second inductor is grounded;
the input end of the wireless power transmission transmitting end receives very low frequency current, the first inductor and the second inductor are mutually inductive, the second inductor and the first capacitor generate resonance, and the current is transmitted to the ground through the grounding end; the frequency range of the very low frequency current is 20 kHz;
the first electrode of the first capacitor and the ground form a first capacitor;
the wireless power transmission transmitting end further comprises a fifth inductor and a sixth inductor;
the fifth inductor is connected with the first inductor in series; the sixth inductor is connected in series with the second inductor, and the sixth inductor is an adjustable inductor;
the oscillation factor frequency of the wireless power transmission transmitting end is equal to the sum of the oscillation factor frequencies of the earth and the receiving end;
the wireless power transmission transmitting terminal is also provided with a first overcurrent protection unit, and the first overcurrent protection unit is arranged between the generator and the input end of the wireless power transmission transmitting terminal.
2. The transmit end of a wireless power transmission system of claim 1, further comprising a boost circuit connected between the input end and the wireless power transmission transmit end for boosting a power transmission voltage.
3. The transmitting end of a wireless power transmission system according to claim 1, wherein the wireless power transmission transmitting end further comprises an up-conversion circuit;
the frequency raising circuit is connected between the input end of the wireless power transmission transmitting end and the generator and is used for raising the frequency of the low-frequency current sent by the generator to the very low-frequency current.
4. The transmitting end of the wireless power transmission system according to claim 3, wherein the frequency up-conversion circuit comprises: a third capacitor and a first electric high-frequency igniter;
the first pole of the third capacitor is connected with the first end of the input end of the wireless power transmission transmitting end and the first end of the first electric power high-frequency igniter, the second pole of the third capacitor is connected with the second end of the input end of the wireless power transmission transmitting end, and the second end of the first electric power high-frequency igniter is connected with the first end of the first inductor.
5. The transmitting end of a wireless power transmission system according to claim 1, wherein the first electrode of the first capacitor is a ball electrode or a ring electrode.
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| CN201510179537.3A CN106160252B (en) | 2015-04-14 | 2015-04-14 | Transmitting terminal of wireless power transmission system |
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| CN201510179537.3A CN106160252B (en) | 2015-04-14 | 2015-04-14 | Transmitting terminal of wireless power transmission system |
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| CN106160252B true CN106160252B (en) | 2021-01-29 |
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| EP0639301B1 (en) * | 1992-05-08 | 1997-09-03 | Uniline Limited | Method and apparatus for single line transmission of electrical power |
| CN101552493A (en) * | 2008-12-04 | 2009-10-07 | 廖厚联 | Magnetic circuit power transmission system |
| CN103875158A (en) * | 2011-08-04 | 2014-06-18 | M·班克 | A single-wire electric system |
| CN104362769A (en) * | 2014-11-06 | 2015-02-18 | 华中科技大学 | Wireless energy transmission system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2329505A1 (en) * | 2008-08-25 | 2011-06-08 | Governing Dynamics, LLC. | Wireless energy transfer system |
| AU2013207313A1 (en) * | 2012-03-19 | 2014-11-27 | Howard, Keith Maxwell Mr | System for wireless distribution of power |
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- 2015-04-14 CN CN201510179537.3A patent/CN106160252B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0639301B1 (en) * | 1992-05-08 | 1997-09-03 | Uniline Limited | Method and apparatus for single line transmission of electrical power |
| CN101552493A (en) * | 2008-12-04 | 2009-10-07 | 廖厚联 | Magnetic circuit power transmission system |
| CN103875158A (en) * | 2011-08-04 | 2014-06-18 | M·班克 | A single-wire electric system |
| CN104362769A (en) * | 2014-11-06 | 2015-02-18 | 华中科技大学 | Wireless energy transmission system |
Non-Patent Citations (2)
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| Radiation Losses from a Single Wire Earth Return Power Line with Bends;Cornelis J. Kikkert etal;《2008 Australasian Telecommunication Networks and Applications Conference》;20081210;158-162 * |
| 小型非接触式电能传输系统的设计与实现;赵彪等;《电力电子技术》;20090131;49-51 * |
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