CN108599393B - Design method of equal-length receiving coil for efficient wireless power transmission - Google Patents
Design method of equal-length receiving coil for efficient wireless power transmission Download PDFInfo
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- CN108599393B CN108599393B CN201810416931.8A CN201810416931A CN108599393B CN 108599393 B CN108599393 B CN 108599393B CN 201810416931 A CN201810416931 A CN 201810416931A CN 108599393 B CN108599393 B CN 108599393B
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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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Abstract
The invention discloses a method for designing an equal-length receiving coil for efficient wireless power transmission, which comprises the following steps: (1) setting basic parameters: setting basic parameters of the transmission coil according to application requirements; (2) and after the basic parameters are determined, calculating the length of the transmitting coil, and determining the optimal coil turn spacing of the receiving coil by calculation under the condition of ensuring equal coil lengths. Through the steps, the transmission efficiency of the system can be improved by changing the winding mode of the coil without changing the total length of the conducting wire.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a design method of a coil of a magnetic coupling power transmission system.
Background
Wireless power transmission is also called non-contact power transmission, and refers to that in the process of transmitting power from a power supply end to electric equipment, a used transmission medium is changed from a traditional tangible medium into an aerial intangible medium, direct contact between the equipment is not needed, and potential safety hazards caused by electric sparks and line aging due to friction caused by contact are avoided, so that the wireless power transmission is a research hotspot in recent years. The wireless power transmission technology has wide application prospect, can be used for charging household equipment and electric vehicles, can also play a great role in the fields with special environments such as aerospace, oil field drilling, medical appliances and the like, and has profound research significance.
According to the transmission principle, wireless power transmission can be roughly classified into three categories: electromagnetic induction type wireless power transmission, microwave type wireless power transmission and magnetic coupling resonance type wireless power transmission. Many research and study works have been carried out by scientists at home and abroad in the aspect of wireless power transmission technology for many years, but the progress is slow. In recent years, the magnetic coupling resonant wireless energy transmission technology is rapidly developed as a new wireless power transmission technology, and causes huge reverberation in the field of wireless energy transmission, so that the wireless energy transmission technology becomes a hot problem for researches of domestic and foreign scholars.
Generally, in a wireless power transmission system, a receiving coil and a transmitting coil have the same structure and the same length of wires, but as the transmission distance increases, the transmission efficiency of the system decreases faster, i.e., the same transmitting and receiving coil structure is not the optimal coil structure. If under the unchangeable condition of receiving coil length, through changing its coiling mode, can slow down the reducing speed of efficiency, improve the transmission efficiency of system, whole process will need not to increase the consumptive material, and simple and efficient, is fit for practical application.
Disclosure of Invention
The invention provides a design method of an equal-length receiving coil for efficient wireless power transmission, which changes the winding mode of a wire under the condition of unchanging the length of the wire, improves the transmission efficiency of a system and solves the problem of low transmission efficiency commonly existing in the conventional wireless power transmission system.
In order to achieve the purpose, the specific steps of the planar coil design are as follows:
(1) setting basic parameters: determining the transmission distance d, the average radius r of the transmitting coil and the receiving coil according to the application and the application object1＝r2Initially determining the initial radius r of the two-plane spiral coil as d/4out_1＝rout_210cm, turn-to-turn spacing s of the transmitting coil115mm, N turns16, winding by using a lead with the wire diameter w of 1mm, and leading the total length l of the coil leadiCan be calculated from the following formula:
in the formula [ Ni]Denotes that N is not exceedediWhen subscript i is 1 and 2, parameters of the transmitting coil and the receiving coil are respectively represented, and the parameters of the transmitting coil are substituted into the formula to obtain l1. In radioIn a transmission system, the resonance frequency of the coil is generally selected to be in the order of MHz, i.e. the system operates in a high frequency band, and the problem of reflection must be considered, so that the resistor RSIt needs to match the characteristic impedance of the transmission line, which is 50 Ω, so RSTake 50 omega, load RLDetermined by the charging target;
(2) determining an optimum turn spacing s matched to the basic parameters2': in order to improve the transmission efficiency of the system, the mutual inductance needs to be changed as smoothly as possible, and the mutual inductance between the two coils can be calculated by the following formula:
in the formula of0＝4π×10-7H/M is the vacuum permeability, d is the distance between two coils, and the mutual inductance M is related to s2The partial differential of (c) is zero:
receiving coil turn number N when mutual inductance change is gentlest2And turn-to-turn distance s2The relationship between the two wires is that the lengths of the receiving coil and the receiving coil are equal to each other, and the following requirements are satisfied:
l2＝l1 (4)
simultaneous equations (1), (3) and (4) for determining s2And N2The mutual inductance of the coils can be more smooth under the condition of ensuring the same length of the two coil leads, so that the overall transmission efficiency is improved. At this time s2I.e. the optimum turn spacing s of the equal length receiving coil2’。
Has the advantages that: compared with a common plane wireless electric energy transmission system, the winding mode of the receiving coil is changed under the condition that the length of the wound wire is not changed, so that the transmission efficiency eta in the whole transmission range can be improved.
Drawings
Fig. 1 is a schematic diagram of a wireless power transmission system;
FIG. 2 is a schematic diagram of a planar coil configuration;
FIG. 3 is an equivalent circuit schematic of the system;
FIG. 4 is a graph comparing the mutual inductance curves of the receiver coil after and before optimization;
fig. 5 is a graph comparing transmission efficiency after optimization and before optimization of the receive coil.
Detailed Description
The design method of the equal-length receiving coil for efficient wireless power transmission comprises a transmitting device and a receiving device.
As shown in FIG. 1, the transmitting device comprises a signal generator, a power amplifier, and an adjustable capacitor C1And a transmitting coil, a transmitting coil and an adjustable capacitor C1Realizing series resonance; the receiving device comprises a receiving coil and an adjustable capacitor C2And a load, a receiving coil and an adjustable capacitor C2Series resonance is also achieved. A signal generator in the transmitting device generates a high-frequency signal with fixed frequency, the high-frequency signal is output by a power amplifier to drive a transmitting coil, and the signal is transmitted to a receiving coil through resonance and then to a load.
The specific connection mode of the system is as follows: the signal output end of the signal generator is connected with the signal input end of the power amplifier; the positive output terminal of the power amplifier is connected with one end of the transmitting coil; the other end of the transmitting coil and the adjustable capacitor C1Is connected with one end of the connecting rod; the adjustable capacitor C1And the other end of the second switch is connected to a negative output terminal of the power amplifier. The receiving coil and the transmitting coil are coaxially arranged, one end of the receiving coil is connected with a positive input terminal of a load, and the other end of the receiving coil is connected with the adjustable capacitor C2Connecting; the adjustable capacitor C2The other end of which is connected to the negative terminal of the load.
FIG. 2 is a schematic view of a planar coil structure, wherein rout_1,rout_2Initial radii of the transmitter and receiver coils, s, respectivelyiThe coil structure is determined by the parameters of the turn pitch of the coil and the wire diameter of the wire used by the coil. d is the transmission distance between the two coils.
FIG. 3 is a schematic diagram of an equivalent circuit of the system, where VSAs a signal source, R1,R2The equivalent resistances of the transmitting coil and the receiving coil are far smaller than the internal resistance R of the signal sourceSAnd a load resistance RLAnd can be ignored in the calculation.
Before and after the optimization of the receiving coil, i.e. s, as shown in fig. 42The mutual inductance comparison graph before and after the value optimization shows that the mutual inductance curve after the optimization of the receiving coil has obvious weakening trend at a short distance, the over-coupling of the common planar coil at the short distance can be weakened, and meanwhile, the mutual inductance after the optimization is obviously higher than the mutual inductance before the optimization at a long distance, and the weak coupling at the long distance can be enhanced.
As shown in fig. 5, which is a comparison graph of transmission efficiency of the system before and after the optimization of the receiving coil, it can be seen that the optimized coil system can significantly improve the transmission efficiency of the system in the whole transmission distance range.
Claims (1)
1. The design method of the equal-length receiving coil for high-efficiency wireless power transmission is characterized in that a wireless power transmission system comprises a transmitting device and a receiving device, wherein the transmitting device comprises a signal generator, a power amplifier and an adjustable capacitor C1And a transmitting coil, a transmitting coil and an adjustable capacitor C1Realizing series resonance; the receiving device comprises a receiving coil and an adjustable capacitor C2And a load, a receiving coil and an adjustable capacitor C2Also realize series resonance, signal generator produces the fixed high frequency signal of frequency among the transmitting device, through power amplifier output, drives transmitting coil, transmits the signal for receiving coil through the resonance, and then transmits for the load, and concrete design step is as follows:
(1) setting basic parameters: determining the transmission distance D, the average radius r of the transmitting coil and the receiving coil according to the application and the application object1＝r2D is D/4, D is the transmission distance between two coils, and the initial radius r of the spiral coil is determinedout_1＝rout_210cm, turn-to-turn spacing s of the transmitting coil115mm, N turns16, winding by using a lead with the wire diameter w of 1mm, and leading the total length l of the coil leadiCan be calculated from the following formula:
in the formula [ Ni]Denotes that N is not exceedediIs calculated to obtain l, the index i is 1 and 2 respectively representing the parameters of the transmitting coil and the receiving coil1Internal resistance of source RSTake 50 omega, load RLDetermined by the charging target;
(2) determining an optimum turn spacing s matched to the basic parameters2': in order to improve the transmission efficiency of the system, the mutual inductance needs to be changed as smoothly as possible, and the mutual inductance between the two coils can be calculated by the following formula:
in the formula of0＝4π×10-7H/M is the vacuum permeability, d is the transmission distance between two coils, and the mutual inductance M is related to s2The partial differential of (c) is zero:
receiving coil turn number N when mutual inductance change is gentlest2And turn-to-turn distance s2The relationship between them, in order to make the total length of the receiving coil and the transmitting coil equal, it is necessary to satisfy:
l2＝l1 (4)
resolution of simultaneous formulas (1), (3) and (4) to obtain s2And N2Can make the mutual inductance gentle and ensure the total length of the two coil wires to be the same, and s at the moment2I.e. the optimum turn spacing s of the equal length receiving coil2’。
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| CN103134998A (en) * | 2013-01-31 | 2013-06-05 | 广西电网公司电力科学研究院 | Coil turns selection method during wireless energy transmission based on resonance coupling |
| CN103872798A (en) * | 2014-03-27 | 2014-06-18 | 武汉大学 | Magnetic resonance wireless energy transmission system and optimization method of positions of coils thereof |
| EP2983266B1 (en) * | 2014-08-05 | 2017-02-22 | Panasonic Corporation | Power transmission device and wireless power transmission system |
| CN107231043A (en) * | 2017-07-11 | 2017-10-03 | 杭州电子科技大学 | A kind of wireless power supply transmitted based on single line electric energy |
| CN107370248A (en) * | 2017-08-17 | 2017-11-21 | 河南师范大学 | Deng radius electromagnetic resonant parallel power coil design method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134998A (en) * | 2013-01-31 | 2013-06-05 | 广西电网公司电力科学研究院 | Coil turns selection method during wireless energy transmission based on resonance coupling |
| CN103872798A (en) * | 2014-03-27 | 2014-06-18 | 武汉大学 | Magnetic resonance wireless energy transmission system and optimization method of positions of coils thereof |
| EP2983266B1 (en) * | 2014-08-05 | 2017-02-22 | Panasonic Corporation | Power transmission device and wireless power transmission system |
| CN107231043A (en) * | 2017-07-11 | 2017-10-03 | 杭州电子科技大学 | A kind of wireless power supply transmitted based on single line electric energy |
| CN107370248A (en) * | 2017-08-17 | 2017-11-21 | 河南师范大学 | Deng radius electromagnetic resonant parallel power coil design method |
Non-Patent Citations (1)
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| 小功率无线电能传输系统谐振线圈设计优化;冯帆 等;《电子测量技术》;20170131;全文 * |
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