CN110112837A - The wireless power supply system of multi-emitting coils from parallel connection of coils power supply based on PT symmetry principle - Google Patents
The wireless power supply system of multi-emitting coils from parallel connection of coils power supply based on PT symmetry principle Download PDFInfo
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- CN110112837A CN110112837A CN201910553145.7A CN201910553145A CN110112837A CN 110112837 A CN110112837 A CN 110112837A CN 201910553145 A CN201910553145 A CN 201910553145A CN 110112837 A CN110112837 A CN 110112837A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The wireless power supply system for the multi-emitting coils from parallel connection of coils power supply based on PT symmetry principle that the invention discloses a kind of, including emitter and reception device；Emitter includes negative resistance and n transmitting module, and negative resistance and n transmitting module are connected in parallel, and provides energy for system, each transmitting module is made of the transmitting coil, transmitting terminal resonant capacitance and transmitting coil equivalent internal resistance of series connection；Reception device includes receiving module and load, and receiving module and connected in series with the load, receiving module are made of the receiving coil, receiving end resonant capacitance and receiving coil equivalent internal resistance being connected in series.The present invention realizes constant efficiency of transmission and output power in parity-time symmetrical region, and effectively reduces the critical coupling coefficient of system, improve the critical transmission range of system, and the ability of system output power is improved, for powerful application, there is significant advantage.
Description
Technical Field
The invention relates to the technical field of wireless power transmission or wireless power transmission, in particular to a wireless power supply system with multiple transmitting coils for power supply in parallel based on a PT (potential transformer) symmetry principle.
Background
Compared with a traditional wire Power supply mode without electrical connection, the Wireless Power Transfer (WPT) has the advantages of flexibility, convenience, safety, reliability and the like. The existing wireless power transmission technology is mainly based on the electromagnetic induction and magnetic resonance principle, and part of research results are applied to the fields of electronic consumer products, implantable medical equipment, electric vehicle charging and the like. However, the inductive wireless power transmission technology has short transmission distance and low efficiency, and the magnetic resonance wireless power transmission technology has the problems of frequency splitting, high resonance frequency, small output power, short distance and even no power output. The bottleneck problem existing in the two methods is not solved, and the practical application of the wireless power transmission technology is greatly limited.
The university of washington, 1998, in bender.c.m, created the universal-time (PT) symmetric quantum theory, which has been successfully applied to many fields of optics, materials science, etc. In recent years, researchers apply the space-time (PT) symmetric quantum theory to the field of wireless power transmission, which shows great advantages, but the critical transmission distance of the traditional single transmitting coil system based on the space-time symmetric principle is not optimal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a wireless power supply system with multiple transmitting coils for power supply in parallel based on a PT (potential transformer) symmetry principle, and constant transmission efficiency and output power are realized in an astronomical-time symmetric region. Compared with a system of a single transmitting coil based on the principle of space-time symmetry, the invention effectively reduces the critical coupling coefficient of the system, namely improves the critical transmission distance of the system, improves the capability of the system to output power, and has obvious advantages for high-power application occasions.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the wireless power supply system comprises a transmitting device and a receiving device, wherein the wireless power supply system is powered by multiple transmitting coils in parallel based on a PT (potential transformer) symmetry principle; the transmitting device comprises a negative resistor and n transmitting modules, the negative resistor and the n transmitting modules are connected in parallel and provide energy for the system, and each transmitting module consists of a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series; the receiving device comprises a receiving module and a load, wherein the receiving module is connected with the load in series, and the receiving module consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series.
Further, the transmitting coils of the n transmitting modules have symmetrical parameters and the same coupling degree with the receiving coils, and the transmitting coils of the n transmitting modules are completely decoupled with each other, namely, the following requirements are met:
wherein,andrespectively representing the inductance value, the equivalent internal resistance value and the mutual inductance value between the ith transmitting coil and the receiving coil, wherein i is 1,2,3 … n;denotes a mutual inductance value between the ith and jth transmitter coils, i ≠ 1,2,3 … n, j ≠ 1,2,3 … n, and i ≠ j,representing the value of the mutual inductance between the i-th transmit coil and the receive coil.
Further, the steady state operation of the wireless power supply system meets the space-time symmetry condition:
wherein,representing the natural frequency of each transmit coil loop,representing the natural frequency of the receive coil loop; l isPFor the inductance value of the respective transmitting coil, i.e.LSAn inductance value of the receiving coil; cPFor each transmitting end resonant capacitance value, i.e.CSIs a receiving end resonance capacitance value; rpEquivalent internal resistance for each transmitting coilValue, i.e.RSThe equivalent internal resistance value of the receiving coil; -RNIs a negative resistance value, RLIs the load resistance value;for mutual inductance between the respective transmitter and receiver coils, MPSFor mutual inductance between respective transmitter and receiver coils, i.e.
Further, the voltage and current relationship of the negative resistance satisfies the following conditions:the phase relation satisfies:wherein,for the current flowing through the negative resistance, V1Is the voltage across the negative resistance, -RNIs the resistance value of the negative resistance and is automatically adjustable.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the system has simple and reliable structure, and can realize constant transmission efficiency and output power when the load is fixed.
2. Compared with a traditional wireless power supply system with a single transmitting coil based on the principle of space symmetry and time symmetry, the critical coupling coefficient of the system is remarkably reduced, namely the critical transmission distance is remarkably improved.
3. The power supply is realized by connecting a plurality of transmitting coils in parallel, so that the capability of outputting power of the system is effectively improved, and the power supply system is suitable for occasions with high-power requirements and has remarkable advantages.
Drawings
Fig. 1 is an equivalent circuit schematic diagram of a wireless power supply system with multiple transmitting coils powered in parallel based on PT symmetry principle.
Fig. 2 is a schematic diagram of two symmetrical and completely decoupled transmitting coils according to the embodiment.
Fig. 3 is a schematic diagram of two symmetrical and completely decoupled transmitter coils according to another embodiment.
Fig. 4 is a graph of the transmission efficiency of the system versus the coupling coefficient in the embodiment.
Fig. 5 is a graph of system output power versus coupling coefficient in an embodiment.
Fig. 6 is a comparison graph of critical coupling coefficients of a dual-transmitting-coil wireless power supply system and a conventional single-receiving-coil wireless charging system under different loads.
Detailed Description
To further illustrate the content and features of the present invention, the following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the invention is not limited thereto.
As shown in fig. 1, the wireless power supply system with multiple transmitting coils for parallel power supply based on PT symmetry principle provided in this embodiment includes two parts, namely a transmitting device and a receiving device, where the transmitting device includes a negative resistor-RNAnd n transmitting modules, the negative resistance-RNAnd n transmitting modules connected in parallel, the negative resistance-RNFor energizing the system, each transmitter module is provided with a series-connected transmitter coilTransmitting terminal resonance capacitorAnd equivalent internal resistance of transmitting coilComposition is carried out; the receiving device comprises a receiving module and a load, wherein the receiving module and the load are connected in series, and the receiving module is composed of a receiving coil L connected in seriesSReceiving end resonant capacitor CSAnd equivalent internal resistance R of receiving coilSAnd (4) forming.
Further, the transmitting coils of the n transmitting modules have symmetrical parameters and the same coupling degree with the receiving coils, and the transmitting coils of the n transmitting modules are completely decoupled from each other, so that the parameters can be obtained from kirchhoff's law according to fig. 1:
in the formula (1), -RNIs a negative resistance value, RLIs the load resistance value;respectively representing the inductance value, the equivalent internal resistance value and the ith transmitting end resonance capacitor of the ith transmitting coil; l isSInductance value for the receiving coil, CSIs the receiving end resonance capacitance value, RSThe equivalent internal resistance value of the receiving coil;is the mutual inductance between the ith transmitter coil and the receiver coil,the current vectors of the ith transmitting loop and the ith receiving loop are respectively, wherein i is 1,2,3 … n; ω is the operating frequency of the system.
Since the parameters of the n transmitting coils are completely symmetrical and the coupling degree with the receiving coil is the same, the method can be known
Let LPFor the inductance value of each transmitting coil, CPFor each transmitting end resonant capacitance value, RPIs the internal resistance, M, of each transmitting coilPSFor the mutual inductance values of the respective transmitter and receiver coils,for the natural frequency of each of the transmit loops,for the natural frequency of the receiving loop, equation (1) can be simplified as follows:
wherein,for the mutual inductance between the respective transmitter and receiver coils,is an equivalent transmit loop current vector.
The condition that formula (2) has a non-zero solution is:
the real-imaginary part separation of equation (3) can be obtained:
when the transmitting loop and the equivalent receiving loop form an astronomical-time symmetric circuit, i.e.
Equation (4) can be simplified as:
from the above equation, the frequency solution can be:
the condition that a purely real solution of frequency exists can be further derived from equation (7):
therefore, the following conditions are also required to be met during the steady-state operation of the system:
in this case, the equivalent transmitting loop current effective value I 'can be obtained from the expressions (2) and (5)'PAnd receiving loop current effective value ISThe ratio of the components is as follows:
and according to power conservation:
the efficiency η of the system at this time is equal to:
transmission power PoEqual to:
the ratio (L) of the transmitting coil inductance value and the receiving coil inductance value of the traditional single-receiving coil power supply system based on the PT symmetry principle and the wireless power supply system provided by the invention and powered by multiple transmitting coils in parallel based on the PT symmetry principle is assumedP/LS) If the two signals are equal, the power supply system adopting the multi-transmitting coil parallel power supply and the power supply system adopting the single transmitting coil have the same transmission efficiency according to the formula (12); meanwhile, as can be seen from the equation (9), the critical coupling coefficient of the system can be effectively reduced by adopting the power supply of the multiple transmitting coils in parallel, and as can be seen from the equation (13), the output power of the system can be effectively improved by adopting the power supply of the multiple transmitting coils in parallel.
To further illustrate the advantages of the present invention, in the present embodiment, by way of example, a wireless power supply system for parallel power supply of dual transmitting coils based on the principle of space symmetry and time symmetry is designed. The electrical parameters of the system are as follows: v1100V, transmitting coil inductanceInductance L of receiving coilS100 muH, natural frequency ωP＝ωS300kHz, equivalent internal resistanceThe negative resistance is realized by a power electronic circuit.
Optionally, fig. 2 is a structure of two transmitting coils with symmetric parameters and decoupled from each other, which is implemented by vertically stacking two fully symmetric DD-type coils, in which the receiving coils also have the same structure, and only two layers of DD-type coils are connected in series; alternatively, fig. 3 is another two-parameter symmetric and mutually decoupled transmitting coil structure, which is implemented by partially overlapping two completely symmetric planar coils, preferably, two completely symmetric rectangular planar coils are used, and preferably, the receiving coil in this embodiment is a planar rectangular coil, but the transmitting coil and the receiving coil are not limited to the above two structures.
FIG. 4 and FIG. 5 show a load RLWhen the system is 5 Ω, the relationship curve between the transmission efficiency and the output power of the system and the coupling coefficient shows that the system provided by the invention realizes constant transmission efficiency and output power in an area of space-time symmetry. Fig. 6 shows the critical coupling coefficients of the dual-transmitting-coil wireless power supply system and the conventional single-receiving-coil wireless charging system under different loads, and it can be seen that the system provided by the invention can effectively reduce the critical coupling coefficient, i.e. the critical transmission distance is significantly increased, and the system has practical application value and is worthy of popularization.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention and its embodiments should not be limited thereto, so that the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. Wireless power supply system of many transmitting coils parallel power supply based on PT symmetrical principle its characterized in that: the wireless power supply system comprises a transmitting device and a receiving device; the transmitting device comprises a negative resistor and n transmitting modules, the negative resistor and the n transmitting modules are connected in parallel and provide energy for the system, and each transmitting module consists of a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series; the receiving device comprises a receiving module and a load, wherein the receiving module is connected with the load in series, and the receiving module consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series.
2. The PT symmetry principle based wireless power supply system with parallel power supply of multiple transmitting coils as claimed in claim 1, wherein: the parameters of the transmitting coils of the n transmitting modules are symmetrical and the coupling degree between the transmitting coils and the receiving coils is the same, and the transmitting coils of the n transmitting modules are completely decoupled mutually, namely, the following requirements are met:
wherein,andrespectively representing the inductance value, the equivalent internal resistance value and the mutual inductance value between the ith transmitting coil and the receiving coil, wherein i is 1,2,3 … n;denotes a mutual inductance value between the ith and jth transmitter coils, i ≠ 1,2,3 … n, j ≠ 1,2,3 … n, and i ≠ j,representing the value of the mutual inductance between the i-th transmit coil and the receive coil.
3. The PT symmetry principle based wireless power supply system with parallel power supply of multiple transmitting coils as claimed in claim 1, wherein: the steady state operation of the wireless power supply system meets the space-time symmetry condition:
wherein,representing the natural frequency of each transmit coil loop,representing the natural frequency of the receive coil loop; l isPFor the inductance value of the respective transmitting coil, i.e.LSAn inductance value of the receiving coil; cPFor each transmitting end resonant capacitance value, i.e.CSIs a receiving end resonance capacitance value; rpFor each transmitting coil equivalent internal resistance, i.e.RSThe equivalent internal resistance value of the receiving coil; -RNIs a negative resistance value, RLIs the load resistance value;for mutual inductance between the respective transmitter and receiver coils, MPSFor mutual inductance between respective transmitter and receiver coils, i.e.
4. The PT symmetry principle based wireless power supply system with parallel power supply of multiple transmitting coils as claimed in claim 1, wherein: the voltage and current relation of the negative resistance satisfies the following conditions:the phase relation satisfies:wherein,for the current flowing through the negative resistance, V1Is the voltage across the negative resistance, -RNIs the resistance value of the negative resistance and is automatically adjustable.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611375A (en) * | 2019-10-28 | 2019-12-24 | 华南理工大学 | Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle |
| CN110649715A (en) * | 2019-10-28 | 2020-01-03 | 华南理工大学 | Multi-frequency many-to-one wireless power supply system based on PT (potential Transformer) symmetry principle |
| CN110943551A (en) * | 2019-12-13 | 2020-03-31 | 华南理工大学 | Multi-load wireless power transmission system with constant power and constant efficiency characteristics |
| CN111342566A (en) * | 2020-03-25 | 2020-06-26 | 西安电子科技大学 | Resonance tracking type non-contact multi-path power supply device and power supply method |
| CN112018904A (en) * | 2020-09-21 | 2020-12-01 | 同济大学 | Synthetic PT symmetrical system realized based on passive single resonant coil |
| CN112491158A (en) * | 2020-11-17 | 2021-03-12 | 哈尔滨工业大学 | Circuit structure with adjustable current proportion between two parallel-wound wireless power transmission coil strands and parameter design method |
| CN112635179A (en) * | 2020-12-28 | 2021-04-09 | 苏州电掣智能科技有限公司 | Wireless charging device |
| CN112803614A (en) * | 2021-03-17 | 2021-05-14 | 安徽工业大学 | Wireless power supply system based on receiving end equivalent negative resistance PT symmetry and control method |
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| CN210092970U (en) * | 2019-06-25 | 2020-02-18 | 广州汇力威无线供电技术有限公司 | PT symmetry principle-based wireless power supply system with multiple transmitting coils for parallel power supply |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110611375A (en) * | 2019-10-28 | 2019-12-24 | 华南理工大学 | Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle |
| CN110649715A (en) * | 2019-10-28 | 2020-01-03 | 华南理工大学 | Multi-frequency many-to-one wireless power supply system based on PT (potential Transformer) symmetry principle |
| CN110943551A (en) * | 2019-12-13 | 2020-03-31 | 华南理工大学 | Multi-load wireless power transmission system with constant power and constant efficiency characteristics |
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| CN111342566B (en) * | 2020-03-25 | 2021-10-26 | 西安电子科技大学 | Resonance tracking type non-contact multi-path power supply device and power supply method |
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| CN112491158A (en) * | 2020-11-17 | 2021-03-12 | 哈尔滨工业大学 | Circuit structure with adjustable current proportion between two parallel-wound wireless power transmission coil strands and parameter design method |
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| CN112803614A (en) * | 2021-03-17 | 2021-05-14 | 安徽工业大学 | Wireless power supply system based on receiving end equivalent negative resistance PT symmetry and control method |
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