CN113839473B - Anti-offset magnetic coupling wireless power transmission charging device - Google Patents

Anti-offset magnetic coupling wireless power transmission charging device Download PDF

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CN113839473B
CN113839473B CN202111273309.4A CN202111273309A CN113839473B CN 113839473 B CN113839473 B CN 113839473B CN 202111273309 A CN202111273309 A CN 202111273309A CN 113839473 B CN113839473 B CN 113839473B
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coil
transmitting coil
transmitting
wireless power
power transmission
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CN113839473A (en
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徐万里
张航
王长富
鲁长波
***
周友杰
陈今茂
安高军
李华
徐磊
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Institute Of Military New Energy Technology Institute Of Systems Engineering Academy Of Military Sciences
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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
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • 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
    • 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
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an anti-offset magnetic coupling wireless power transmission charging device, which comprises a signal generator, a power amplifier, a switchable coil, a distance measuring module, a controller, a receiving coil and a load, wherein the signal generator is connected with the power amplifier; the switchable coil comprises N0The wireless power transmission device comprises a signal generator, a power amplifier, a switchable coil, a distance measurement module, a transmitting coil and a receiving coil, wherein the signal generator is connected with the power amplifier, the power amplifier is connected with the switchable coil, the switchable coil is connected with the distance measurement module, wireless power transmission is carried out between the switchable coil and the receiving coil through magnetic coupling, and the receiving coil is connected with a load. The controller calculates the mutual inductance between each transmitting coil and each receiving coil of the switchable coils, the internal resistance of each transmitting coil and the efficiency coefficient, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission. The control circuit of the invention is simple, has low loss and low cost, and can realize the anti-offset target only by controlling the access of different transmitting coils.

Description

Anti-offset magnetic coupling wireless power transmission charging device
Technical Field
The invention relates to the technical field of wireless charging, in particular to an anti-offset magnetic coupling wireless power transmission charging device.
Background
With the development of the times, the development of power equipment is also changing day by day, and the power equipment is applied to various complicated occasions. The traditional wired electric energy transmission has the problem that electric sparks are generated due to the fact that an electric transmission line is easy to damage and age, the service life of electrical equipment is seriously influenced, even the personal safety of people is influenced, and the requirement of people for high-quality living standard cannot be met. The magnetic coupling resonance transmission technology has the characteristics of moderate transmission power, high efficiency and moderate distance, and has important research value and application significance.
Although wireless transmission has many advantages, there are still many problems in engineering applications. In many application scenarios, such as charging of bioelectronic devices in biomedicine, electric vehicles, unmanned aerial vehicles, and mobile electronic devices, a flexible transfer location and a high charging efficiency are required. When the mobile device is charged, the charging efficiency of the receiving coil offset system is rapidly reduced, and different charging terminals need different charging platforms due to different required power. Ideally, the charging platform should be versatile and capable of both power adaptation and distance adaptation. To solve the above-mentioned problems of mobile wireless charging, many methods are proposed, such as adaptive frequency tracking, impedance matching method, coil structure design.
The frequency tracking technology is to realize tracking control of the resonant frequency of a transmitting loop by adding a series of complex circuits such as a high-frequency current detector, a differential amplifier, a phase compensator, a phase-locked loop and the like in a WPT/MRC system. However, these additional circuits complicate the system, affect the reliability and efficiency of the system, and the system has insufficient resistance to offset in the horizontal and offset directions.
The impedance matching method is to add an impedance matching circuit to a transmitting end of the WPT system to realize impedance matching of the system, thereby improving the efficiency of the system, however, the power transmission efficiency between coils cannot be improved by a simple impedance matching method.
Disclosure of Invention
The invention discloses an anti-offset magnetic coupling wireless power transmission charging device, which aims at solving the problems that power transmission efficiency is reduced and different power requirements of different loads are difficult to adapt to after a receiving end coil of an existing wireless power transmission system deviates. Internal resistance of the power amplifier is RsAt an input voltage of VsThe switchable coil comprises N0A transmitting coil for wireless power transmission, the transmitting coil n has an internal resistance of RnThe compensation capacitance of the transmitting coil n is CnA receiving coil LRXIncluding parasitic resistance RRXAnd a compensation capacitor CRX. Inductance of the receiving coil is LRXThe resistance of the load is RLThe inductance of the switchable coil is Ln. The signal generator is connected with the power amplifier, the power amplifier is connected with the switchable coil, the switchable coil is connected with the distance measuring module, the distance measuring module is connected with the controller, the signal generator, the power amplifier, the switchable coil and the distance measuring module are located at a transmitting end of wireless power transmission, wireless power transmission is carried out between the switchable coil and the receiving coil through magnetic coupling, the receiving coil is connected with a load, and the receiving coil and the load are located at a receiving end of the wireless power transmission.
The transmitting end distance measuring module measures the horizontal offset distance h and the vertical offset distance d between the receiving coil and the transmitting coil and sends the measured distances to the controller, the controller calculates the mutual inductance between each transmitting coil and each receiving coil of the switchable coils, the internal resistance of each transmitting coil and the efficiency coefficient according to the received distances, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission.
For the transmitting coil n, the controller calculates the mutual inductance Mn of the transmitting coil n and the receiving coil, and the calculation formula of the mutual inductance Mn is as follows:
Figure BDA0003329444660000021
wherein N is1、N2Number of turns per layer, r, of the transmitter coil n and the receiver coil, respectively1Is the radius of the transmitting coil n, r2Radius of the receiving coil, μ0For vacuum permeability, RQNIs the distance between any two points on the two coils, theta and phi are the azimuth angle and the pitch angle of any point on the receiving coil relative to any point on the transmitting coil n, RQNThe calculation formula of (2) is as follows:
Figure BDA0003329444660000022
the controller calculates the internal resistance R of the transmitting coil n according to the Ferrah formulanThe calculation formula is as follows:
Rn＝RDC+RAC，
Figure BDA0003329444660000031
Figure BDA0003329444660000032
Figure BDA0003329444660000033
in the formula, RDC is the direct-current resistance of the transmitting coil n, RACFor the alternating current resistance of the transmitter coil N, ρ is the resistivity of copper, m and N are the number of layers and turns of the coil, respectively, lwLength of copper wire for transmitting coil, dsIs the diameter of the copper wire of the transmitting coil, f is the current frequency in Hz, rsRadius of copper wire for transmitting coil, nsNumber of copper wires for transmitting coil, fhThe frequency of the alternating current when the alternating current resistance of the transmitting coil is twice the direct current resistance, mu is the magnetism of the mediumConductivity, k is the ratio of the area of the wire in the conductor to the area of the conductor strip insulation;
controller according to MnAnd RnCalculating gamman，γnAs an efficiency coefficient of the transmitting coil n,
Figure BDA0003329444660000034
the controller selects gammanIs used for wireless power transmission, N is 1,2, …, N0。
And when the horizontal offset distance h and the vertical offset distance d between the receiving coil and the transmitting coil are changed, the controller recalculates the mutual inductance between each transmitting coil and the receiving coil of the switchable coil, the internal resistance of each transmitting coil and the efficiency coefficient, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission.
The invention has the beneficial effects that:
the invention discloses an anti-offset magnetic coupling wireless power transmission charging device, which utilizes the mutual inductance and the internal resistance of a receiving coil and a transmitting coil to calculate the efficiency coefficient of the receiving coil and the transmitting coil, achieves the aim of anti-offset wireless power transmission by maximizing the efficiency coefficient, and realizes the maximization of the charging efficiency when the coils are offset.
The control circuit of the invention is simple, has low loss and low cost, can realize the anti-offset target only by controlling the access of different transmitting coils, can realize the anti-offset in the transverse direction and the longitudinal direction simultaneously, and has the advantage of wide application range.
Drawings
Fig. 1 is a structural diagram of the anti-offset magnetic coupling wireless power transmission charging device according to the present invention;
FIG. 2 is a coil position diagram of the magnetically coupled wireless power transfer apparatus of the present invention;
fig. 3 is a flow chart of switching coils according to the present invention.
Detailed Description
For a better understanding of the present disclosure, an example is given here. Fig. 1 is a structural diagram of the anti-offset magnetic coupling wireless power transmission charging device according to the present invention; FIG. 2 is a diagram of coil positions for magnetically coupled wireless power transfer in accordance with the present invention; fig. 3 is a flow chart of switching coils according to the present invention. In fig. 3, γ 1 is stored as the maximum value of the efficiency coefficient of the transmitting coil.
The invention discloses an anti-offset magnetic coupling wireless power transmission charging device, which aims at solving the problems that power transmission efficiency is reduced and different power requirements of different loads are difficult to adapt to after a receiving end coil of an existing wireless power transmission system deviates. Internal resistance of the power amplifier is RsAt an input voltage of VsThe switchable coil comprises M0A transmitting coil for wireless power transmission, the transmitting coil n has an internal resistance of RnThe compensation capacitance of the transmitting coil n is CnA receiving coil LRXIncluding parasitic resistance RRXAnd a compensation capacitor Crx. Inductance of the receiving coil is LRXThe resistance of the load is RLThe inductance of the switchable coil is Ln. The signal generator is connected with the power amplifier, the power amplifier is connected with the switchable coil, the switchable coil is connected with the distance measuring module, the distance measuring module is connected with the controller, the signal generator, the power amplifier, the switchable coil and the distance measuring module are located at a transmitting end of wireless power transmission, wireless power transmission is carried out between the switchable coil and the receiving coil through magnetic coupling, the receiving coil is connected with a load, and the receiving coil and the load are located at a receiving end of the wireless power transmission.
The transmitting end distance measuring module measures the horizontal offset distance h and the vertical offset distance d between the receiving coil and the transmitting coil and sends the measured distances to the controller, the controller calculates the mutual inductance between each transmitting coil and each receiving coil of the switchable coils, the internal resistance of each transmitting coil and the efficiency coefficient according to the received distances, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission.
Fig. 1 is a structural diagram of the anti-offset magnetic coupling wireless power transmission charging device according to the present invention. Radio energy transmission efficiency etacoilThe calculation formula of (2) is as follows:
Figure BDA0003329444660000051
wherein, γnAs an efficiency coefficient of the transmitting coil n,
Figure BDA0003329444660000052
Mnis the mutual inductance between the transmitter coil n and the receiver coil, and omega is the current frequency, which can be derived from the efficiency formula, gammanThe larger the value, the higher the efficiency between the coils.
For the transmitting coil n, the controller calculates the mutual inductance Mn of the transmitting coil n and the receiving coil, and the calculation formula of the mutual inductance Mn is as follows:
Figure BDA0003329444660000053
wherein N is1、N2Number of turns per layer, r, of the transmitter coil n and the receiver coil, respectively1Is the radius of the transmitting coil n, r2Radius of the receiving coil, μ0For vacuum permeability, RQNIs the distance between any two points on the two coils, theta and phi are the azimuth angle and the pitch angle of any point on the receiving coil relative to any point on the transmitting coil n, RQNThe calculation formula of (2) is as follows:
Figure BDA0003329444660000054
and (3) researching the transmission efficiency of the system, namely the axial deviation d and the transverse deviation h when the displacement change occurs between the two coils. As can be seen from the transmission efficiency calculation formula, the displacement change only affects the mutual inductance.
The controller calculates the internal resistance R of the transmitting coil n according to the Ferrah formulanThe calculation formula is as follows:
Rn＝RDC+RAC，
Figure BDA0003329444660000055
Figure BDA0003329444660000056
Figure BDA0003329444660000061
in the formula, RDCIs the direct-current resistance of the transmitting coil n, RACFor the alternating current resistance of the transmitter coil N, ρ is the resistivity of copper, m and N are the number of layers and turns of the coil, respectively, lwLength of copper wire for transmitting coil, dsIs the diameter of the copper wire of the transmitting coil, f is the current frequency in Hz, rsRadius of copper wire for transmitting coil, nsNumber of copper wires for transmitting coil, fhWhen the frequency of the alternating current is a frequency at which the alternating current resistance of the transmitting coil is twice the direct current resistance, mu is the permeability of the medium, k is the ratio of the area of the wire in the conductor to the area of the conductor strip insulation, and when the frequency of the current is constant,
Figure BDA0003329444660000062
is a constant. Therefore, the coil resistance is proportional to the coil diameter.
Controller according to MnAnd RnCalculating gamman，γnAs an efficiency coefficient of the transmitting coil n,
Figure BDA0003329444660000063
the controller selects gammanIs used for wireless power transmission, N is 1,2, …, N0；
And when the horizontal offset distance h and the vertical offset distance d between the receiving coil and the transmitting coil are changed, the controller recalculates the mutual inductance between each transmitting coil and the receiving coil of the switchable coil, the internal resistance of each transmitting coil and the efficiency coefficient, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (3)

1. An anti-offset magnetic coupling wireless power transmission charging device is characterized by comprising a signal generator, a power amplifier, a switchable coil, a distance measuring module, a controller, a receiving coil and a load; the switchable coil comprises N0The signal generator, the power amplifier, the switchable coil and the ranging module are positioned at a transmitting end of the wireless power transmission, the switchable coil and the receiving coil are in wireless power transmission through magnetic coupling, the receiving coil is connected with a load, and the receiving coil and the load are positioned at a receiving end of the wireless power transmission;
the transmitting end distance measuring module measures a horizontal offset distance h and a vertical offset distance d between the receiving coil and the transmitting coil and sends the measured distances to the controller, the controller calculates the mutual inductance between each transmitting coil and each receiving coil of the switchable coils, the internal resistance of each transmitting coil and the efficiency coefficient according to the received distances, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission;
for the transmitting coil n, the controller calculates the mutual inductance Mn of the transmitting coil n and the receiving coil, and the calculation formula of the mutual inductance Mn is as follows:
Figure FDA0003490869430000011
，
wherein N is1、N2Each layer of turns of the transmitting coil n and the receiving coil respectivelyNumber r1Is the radius of the transmitting coil n, r2Radius of the receiving coil, μ0For vacuum permeability, RQNIs the distance between any two points on the two coils, theta and phi are the azimuth angle and the pitch angle of any point on the receiving coil relative to any point on the transmitting coil n, RQNThe calculation formula of (2) is as follows:
Figure FDA0003490869430000012
the controller calculates the internal resistance R of the transmitting coil n according to the Ferrah formulanThe calculation formula is as follows:
Rn＝RDC+RAC，
Figure FDA0003490869430000021
Figure FDA0003490869430000022
Figure FDA0003490869430000023
in the formula, RDCIs the direct-current resistance of the transmitting coil n, RACFor the alternating current resistance of the transmitter coil N, ρ is the resistivity of copper, m and N are the number of layers and turns of the coil, respectively, lwLength of copper wire for transmitting coil, dsIs the diameter of the copper wire of the transmitting coil, f is the current frequency in Hz, rsRadius of copper wire for transmitting coil, nsNumber of copper wires for transmitting coil, fhIs the alternating current frequency when the alternating current resistance value of the transmitting coil is twice the direct current resistance value, mu is the magnetic permeability of the medium, and k is the ratio of the area of the wire in the conductor to the area of the conductor belt insulator;
controller according to MnAnd RnComputingγn，γnAs an efficiency coefficient of the transmitting coil n,
Figure FDA0003490869430000024
the controller selects gammanIs used for wireless power transmission, N is 1,2, …, N0。
2. An anti-drift magnetically-coupled wireless power transfer charging apparatus according to claim 1, wherein the internal resistance of the transmitting coil n is RnThe compensation capacitance of the transmitting coil n is CnA receiving coil LRXIncluding parasitic resistance RRXAnd a compensation capacitor CRX(ii) a Inductance of the receiving coil is LRXThe resistance of the load is RLThe inductance of the switchable coil is Ln(ii) a Internal resistance of the power amplifier is RsAt an input voltage of Vs。
3. An offset-resistant magnetically-coupled wireless power transfer charging apparatus according to claim 1,
and when the horizontal offset distance h and the vertical offset distance d between the receiving coil and the transmitting coil are changed, the controller recalculates the mutual inductance between each transmitting coil and the receiving coil of the switchable coil, the internal resistance of each transmitting coil and the efficiency coefficient, and selects the transmitting coil with the maximum efficiency coefficient for wireless power transmission.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106165233A (en) * 2014-02-14 2016-11-23 麻省理工学院 Wireless power transfer
CN112436614A (en) * 2020-10-10 2021-03-02 温州大学 Wireless power transmission device with anti-offset performance and implementation method thereof
CN112910108A (en) * 2021-01-19 2021-06-04 南京韦兹科技有限公司 Wireless charging system of anti skew in submarine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101184503B1 (en) * 2010-08-13 2012-09-20 삼성전기주식회사 Wireless power transmission apparatus and transmission method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106165233A (en) * 2014-02-14 2016-11-23 麻省理工学院 Wireless power transfer
CN112436614A (en) * 2020-10-10 2021-03-02 温州大学 Wireless power transmission device with anti-offset performance and implementation method thereof
CN112910108A (en) * 2021-01-19 2021-06-04 南京韦兹科技有限公司 Wireless charging system of anti skew in submarine

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