CN110445265B - Decoupling device of wireless power transmission system - Google Patents
Decoupling device of wireless power transmission system Download PDFInfo
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- CN110445265B CN110445265B CN201910898376.1A CN201910898376A CN110445265B CN 110445265 B CN110445265 B CN 110445265B CN 201910898376 A CN201910898376 A CN 201910898376A CN 110445265 B CN110445265 B CN 110445265B
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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
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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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
Abstract
The invention discloses a decoupling device of a wireless power transmission system, and relates to the technical field of wireless power transmission. The wireless power transmission system comprises a first receiving coil and a second receiving coil which are coupled, and the decoupling device comprises: a first inductor and a second inductor; the first receiving coil is connected with the first inductor, and the second receiving coil is connected with the second inductor; the mutual inductance between the first and second receive coils is equal to the mutual inductance between the first and second inductors. According to the invention, the decoupling device is arranged on the first receiving coil and the second receiving coil which are magnetically coupled, and the magnetic coupling between the first receiving coil and the second receiving coil is counteracted by utilizing the magnetic coupling between the first inductor and the second inductor; the magnetic coupling between the receiving coils is offset, and the mutual inductance and the induced electromotive force generated by the magnetic coupling are eliminated, so that the wireless power transmission system works in a normal resonance state.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a decoupling device of a wireless power transmission system.
Background
In the static wireless power transmission system, in order to improve the offset resistance of the static wireless power transmission system, a mode of using a plurality of receiving coils may be adopted. When the receiving coils are magnetically coupled, the output performance of the static wireless power transmission system is reduced, and the influence is increased along with the increase of the load and the coupling, so that the output power of the static wireless power transmission system is limited, and the safety and the stability of the static wireless power transmission system are reduced.
In the dynamic wireless power transmission system, the induced voltage of a single receiving coil fluctuates greatly due to the movement of a vehicle body, the fluctuation can be effectively reduced by adopting a structure of a plurality of receiving coils, and in order to eliminate the influence of magnetic coupling between the receiving coils on the output performance of the dynamic wireless power transmission system, a certain distance is kept between the receiving coils, so that the area of the whole receiving device is enlarged. Therefore, the existing wireless power transmission system has the problem of unsatisfactory decoupling effect.
Disclosure of Invention
The invention aims to provide a decoupling device of a wireless power transmission system, which can offset the magnetic coupling between receiving coils, eliminate the adverse effect of the magnetic coupling on the wireless power transmission system and solve the problem of poor decoupling effect of the wireless power transmission system.
In order to achieve the purpose, the invention provides the following scheme:
a decoupling device of a wireless power transmission system is applied to the wireless power transmission system, and the wireless power transmission system comprises: the device comprises a direct current source, a square wave generator, a primary side compensation network, a transmitting coil, a receiving device and a load;
the receiving apparatus includes: the first receiving coil, the second receiving coil, the first secondary compensation network, the second secondary compensation network, the first rectifying and filtering circuit and the second rectifying and filtering circuit;
the decoupling apparatus includes: a first inductor and a second inductor;
the output end of the direct current source is electrically connected with the input end of the square wave generator;
the output end of the square wave generator is electrically connected with the input end of the primary side compensation network;
the output end of the primary side compensation network is electrically connected with the input end of the transmitting coil;
the transmitting coil is respectively arranged corresponding to the first receiving coil and the second receiving coil, and the transmitting coil and the first receiving coil and the transmitting coil and the second receiving coil are coupled; the transmitting coil is respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling;
there is coupling between the first receiving coil and the second receiving coil, and the decoupling device is arranged between the first receiving coil and the second receiving coil;
a first end of the first receiving coil is electrically connected with an input end of the first secondary side compensation network, a second end of the first receiving coil is electrically connected with a first end of the first inductor, and a second end of the first inductor is electrically connected with an input end of the first secondary side compensation network;
a first end of the second receiving coil is electrically connected with a first end of the second inductor, a second end of the second inductor is electrically connected with an input end of the second secondary compensation network, and a second end of the second receiving coil is electrically connected with an input end of the second secondary compensation network;
the first inductor is coupled with the second inductor;
a mutual inductance between the first receive coil and the second receive coil is equal to a mutual inductance between the first inductance and the second inductance;
the output end of the first secondary compensation network is electrically connected with the input end of the first rectification filter circuit;
the output end of the second secondary side compensation network is electrically connected with the input end of the second rectification filter circuit;
the output end of the first rectifying and filtering circuit and the output end of the second rectifying and filtering circuit are electrically connected with the input end of the load.
Optionally, the first end of the first receiving coil and the first end of the second receiving coil are synonym ends;
the first end of the first inductor and the first end of the second inductor are synonym ends.
Optionally, the first end of the first receiving coil and the first end of the second receiving coil are homonymous ends;
the first end of the first inductor and the first end of the second inductor are dotted terminals.
A decoupling device of a wireless power transmission system is applied to the wireless power transmission system, and the wireless power transmission system comprises: the device comprises a direct current source, a square wave generator, a primary side compensation network, a first transmitting coil, a second transmitting coil, a receiving device and a load;
the receiving apparatus includes: the first receiving coil, the second receiving coil, the first secondary compensation network, the second secondary compensation network, the first rectifying and filtering circuit and the second rectifying and filtering circuit;
the decoupling apparatus includes: a transmitting decoupling device and a receiving decoupling device; the transmitting decoupling device comprises a third inductor and a fourth inductor, and the receiving decoupling device comprises a first inductor and a second inductor;
the output end of the direct current source is electrically connected with the input end of the square wave generator;
the output end of the square wave generator is electrically connected with the input end of the primary side compensation network;
the output end of the primary side compensation network is electrically connected with the input ends of the first transmitting coil and the second transmitting coil;
the first transmitting coil and the second transmitting coil are respectively arranged corresponding to the first receiving coil and the second receiving coil, the first transmitting coil is respectively coupled with the first receiving coil and the second receiving coil, and the second transmitting coil is respectively coupled with the first receiving coil and the second receiving coil; the first transmitting coil and the second transmitting coil are respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling;
there is coupling between the first transmitting coil and the second transmitting coil, and the transmitting decoupling device is arranged between the first transmitting coil and the second transmitting coil;
the first end of the first transmitting coil is electrically connected with the output end of the primary side compensation network, the second end of the first transmitting coil is electrically connected with the first end of the third inductor, and the second end of the third inductor is electrically connected with the output end of the primary side compensation network;
the first end of the second transmitting coil is electrically connected with the first end of the fourth inductor, the second end of the fourth inductor is electrically connected with the output end of the primary side compensation network, and the second end of the second transmitting coil is electrically connected with the output end of the primary side compensation network;
the third inductor is coupled with the fourth inductor;
a mutual inductance between the first transmit coil and the second transmit coil is equal to a mutual inductance between the third inductance and the fourth inductance;
there is coupling between the first receiving coil and the second receiving coil, and the receiving decoupling device is arranged between the first receiving coil and the second receiving coil;
a first end of the first receiving coil is electrically connected with an input end of the first secondary side compensation network, a second end of the first receiving coil is electrically connected with a first end of the first inductor, and a second end of the first inductor is electrically connected with an input end of the first secondary side compensation network;
a first end of the second receiving coil is electrically connected with a first end of the second inductor, a second end of the second inductor is electrically connected with an input end of the second secondary compensation network, and a second end of the second receiving coil is electrically connected with an input end of the second secondary compensation network;
the first inductor is coupled with the second inductor;
a mutual inductance between the first receive coil and the second receive coil is equal to a mutual inductance between the first inductance and the second inductance;
the output end of the first secondary compensation network is electrically connected with the input end of the first rectification filter circuit;
the output end of the second secondary side compensation network is electrically connected with the input end of the second rectification filter circuit;
the output end of the first rectifying and filtering circuit and the output end of the second rectifying and filtering circuit are electrically connected with the input end of the load.
Optionally, the first end of the first transmitting coil and the first end of the second transmitting coil are synonym ends;
the first end of the third inductor and the first end of the fourth inductor are synonym terminals.
Optionally, the first end of the first transmitting coil and the first end of the second transmitting coil are homonymous ends;
the first end of the third inductor and the first end of the fourth inductor are dotted terminals.
Optionally, the first end of the first receiving coil and the first end of the second receiving coil are synonym ends;
the first end of the first inductor and the first end of the second inductor are synonym ends.
Optionally, the first end of the first receiving coil and the first end of the second receiving coil are homonymous ends;
the first end of the first inductor and the first end of the second inductor are dotted terminals.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses a decoupling device of a wireless power transmission system, which is applied to the wireless power transmission system, and the wireless power transmission system comprises: the device comprises a direct current source, a square wave generator, a primary side compensation network, a transmitting coil, a receiving device and a load; the receiving apparatus includes: the first receiving coil, the second receiving coil, the first secondary compensation network, the second secondary compensation network, the first rectifying and filtering circuit and the second rectifying and filtering circuit; the decoupling device comprises: a first inductor and a second inductor; the first receiving coil and the second receiving coil are coupled, a decoupling device is arranged between the first receiving coil and the second receiving coil, the first receiving coil is connected with a first inductor, and the second receiving coil is connected with a second inductor; the mutual inductance between the first receiving coil and the second receiving coil generated by the magnetic coupling is equal to the mutual inductance between the first inductor and the second inductor generated by the magnetic coupling. The decoupling device is arranged on the first receiving coil and the second receiving coil which are magnetically coupled, and the magnetic coupling between the first receiving coil and the second receiving coil is utilized to counteract the magnetic coupling between the first receiving coil and the second receiving coil; the magnetic coupling between the receiving coils is offset, and the mutual inductance and the induced electromotive force generated by the magnetic coupling are eliminated, so that the wireless power transmission system works in a normal resonance state, and the area of the receiving device is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a circuit block diagram of a wireless power transmission system according to embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a decoupling device provided in embodiment 1 of the present invention;
fig. 3 is a circuit diagram in which the synonym terminal of the decoupling device provided in embodiment 1 of the present invention is connected to the synonym terminals of the two receiving coils;
fig. 4 is a circuit diagram of the decoupling device according to embodiment 1 of the present invention, in which the homonymous terminal is connected to the synonym terminals of the two receiving coils;
fig. 5 is a circuit diagram of the two receiving coils with the same current direction according to embodiment 1 of the present invention;
fig. 6 is a circuit diagram of the two receiving coils of embodiment 1 of the present invention when the currents are reversed;
fig. 7 is a circuit diagram of a receiving coil with current according to embodiment 1 of the present invention;
fig. 8 is a graph of self inductance and mutual inductance in the receiving loop when the decoupling device is not disposed in the two receiving coils according to embodiment 1 of the present invention;
fig. 9 is a graph of self inductance and mutual inductance in the receiving loop when two receiving coils are provided with the decoupling device according to embodiment 1 of the present invention;
fig. 10 is a circuit block diagram of a wireless power transmission system according to embodiment 2 of the present invention;
fig. 11 is a circuit diagram of a decoupling device provided in embodiment 2 of the present invention.
Wherein, 1, a direct current source; 2. a square wave generator; 3. a primary side compensation network; l isPA transmitting coil; l isS1A first receiving coil; l isS2A second receiving coil; 5. a decoupling device; 6. a first secondary compensation network; 7. a second subsidiary edge compensation network; 8. a first rectifying and filtering circuit; 9. a second rectifying and filtering circuit; 10. a load; l is1A first inductor; l is2A second inductor; m1Mutual inductance of the first receiving coil and the transmitting coil; m2Mutual inductance of the second receiving coil and the transmitting coil; a is1A first end of the first receiving coil; a is2A first end of a second receiving coil; b1The first end of the first inductor; b2A first end of the second inductor; 11. a launch decoupling device; 12. receiving a decoupling device; l isP1A first transmitting coil; l isP2A second transmitting coil; 13. a third inductor; 14. and a fourth inductor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
The present embodiment 1 provides a decoupling apparatus for a wireless power transmission system, and fig. 1 is a circuit block diagram of the wireless power transmission system provided in embodiment 1 of the present invention; fig. 2 is a circuit diagram of the decoupling device provided in embodiment 1 of the present invention. Referring to fig. 1 and fig. 2, the decoupling apparatus for dual receiving coils in the wireless power transmission system of embodiment 1 is applied to a wireless power transmission system, and the wireless power transmission system includes: direct current source 1, square wave generator 2, primary side compensation network 3 and transmitting coil LPA receiving device and a load 10.
The receiving apparatus includes: receiving coil and pairAn edge compensation network and a rectification filter circuit. The receiving coil is a double receiving coil, i.e. the receiving coil comprises a first receiving coil LS1And a second receiving coil LS2. The number of the secondary side compensation networks is two, namely the secondary side compensation networks comprise: a first subsidiary compensation network 6 and a second subsidiary compensation network 7. The number of the rectifying and filtering circuits is two, namely the rectifying and filtering circuit comprises: a first rectifying-filtering circuit 8 and a second rectifying-filtering circuit 9.
The decoupling device 5 comprises: first inductance L1And a second inductance L2. The first inductor and the second inductor form a coupling inductor, the coupling inductor is wound by litz wires, and a coupling medium between the coupling inductors can be a magnetic core or air.
The output end of the direct current source is electrically connected with the input end of the square wave generator.
The output end of the square wave generator is electrically connected with the input end of the primary side compensation network.
And the output end of the primary side compensation network is electrically connected with the input end of the transmitting coil.
The transmitting coil is arranged corresponding to the first receiving coil and the second receiving coil, the transmitting coil is coupled with the first receiving coil, and the transmitting coil is coupled with the second receiving coil. The transmitting coil is respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling.
There is coupling between first receiving coil and the second receiving coil, sets up decoupling device between first receiving coil and the second receiving coil.
The first end of the first receiving coil is electrically connected with the input end of the first secondary side compensation network, the second end of the first receiving coil is electrically connected with the first end of the first inductor, and the second end of the first inductor is electrically connected with the input end of the first secondary side compensation network.
The first end of the second receiving coil is electrically connected with the first end of the second inductor, the second end of the second inductor is electrically connected with the input end of the second secondary compensation network, and the second end of the second receiving coil is electrically connected with the input end of the second secondary compensation network.
The first inductor is coupled with the second inductor, and conductors of the first inductor and the second inductor are litz wires.
The mutual inductance generated by the magnetic coupling between the first receiving coil and the second receiving coil is equal to the mutual inductance generated by the magnetic coupling between the first inductor and the second inductor, that is, the mutual inductance of the first receiving coil and the second receiving coil is M, and the mutual inductance of the first inductor and the second inductor is also M. In practical application, the mutual inductance between the first inductor and the second inductor is equal to the mutual inductance between the first receiving coil and the second receiving coil by determining the number of turns of the winding of the first inductor and the second inductor and adjusting the air gap, so that the purpose of mutual cancellation of magnetic coupling is achieved. In practical applications, the transmitting coil and the receiving coil essentially correspond to an inductor, so this embodiment 1 provides a way to measure the mutual inductance between two inductors: first, the second terminal of the first of the two inductors is connected to the first terminal of the second inductor, and the two terminals of the inductance tester are respectively clamped to the first terminal of the first inductor and the second terminal of the second inductor, so as to measure the inductance value l 1. Then, the second terminal of the first inductor is connected to the second terminal of the second inductor, and the two terminals of the inductance tester are clamped to the first terminal of the first inductor and the first terminal of the second inductor, respectively, to measure an inductance value l 2. The mutual inductance value is obtained by subtracting the inductance value l1 from the inductance value l2 and dividing the result by 4. Meanwhile, the homonymous terminal or the synonym terminal of the two inductors can be determined by utilizing the measuring mode, namely the inductance value l1 is greater than the inductance value l2, and the first terminal of the first inductor and the first terminal of the second inductor are homonymous terminals; the inductance l1 is smaller than the inductance l2, and the first end of the first inductor and the first end of the second inductor are synonym terminals. Meanwhile, in practical application, the mutual inductance of the coupling inductor, namely the first inductor and the second inductor, is equal to the mutual inductance of the first receiving coil and the second receiving coil by selecting the number of strands of the litz wire, the type of the magnetic core of the coupling inductor, the winding turns of the litz wire and the air gap between the magnetic cores.
The output end of the first secondary compensation network is electrically connected with the input end of the first rectifying and filtering circuit. The first receiving coil, the first secondary side compensation network and the first rectifying and filtering circuit are a first receiving loop.
And the output end of the second secondary side compensation network is electrically connected with the input end of the second rectification filter circuit. The second receiving coil, the second secondary side compensation network and the second rectification filter circuit are a second receiving loop.
The output end of the first rectifying and filtering circuit and the output end of the second rectifying and filtering circuit are both electrically connected with the input end of the load.
The direct current source generates square wave voltage with fixed frequency through the square wave generator, the primary side compensation network is matched with the inductance of the transmitting coil, and the secondary side compensation network is matched with the receiving coil after the decoupling device is connected in series, so that the wireless power transmission system works in a normal resonance state.
Since there are attributes of the homonymous terminal and the synonym terminal between the receiving coils, this embodiment 1 further provides two specific connection relationships among the first receiving coil, the second receiving coil, the first inductor, and the second inductor:
a first connection relationship is that the synonym terminal of the coupling inductor is connected to the homonymous terminals of the two receiving coils, fig. 3 is a circuit diagram of the synonym terminal of the decoupling device provided in embodiment 1 of the present invention connected to the homonymous terminals of the two receiving coils, referring to fig. 3, the first terminal a of the first receiving coil1And a first end a of the second receiving coil2Is a synonym terminal; first end b of first inductor1And a first terminal b of a second inductor2Is a synonym.
A second connection relationship is that the homonymous terminal of the coupling inductor is connected to the synonym terminals of the two receiving coils, fig. 4 is a circuit diagram of the decoupling device provided in embodiment 1 of the present invention, in which the homonymous terminal of the decoupling device is connected to the synonym terminals of the two receiving coils, and referring to fig. 4, the first terminal a of the first receiving coil1And a first end a of the second receiving coil2Is a homonymous terminal; first end b of first inductor1And a first terminal b of a second inductor2Is the same name end.
To prove the beneficial effects of the decoupling device in this embodiment 1, a wireless power transmission system, in which the decoupling device is disposed and the receiving coil and the coupling inductor are in the second connection relationship, is analyzed: the wireless power transmission system of this embodiment 1 is in a stable operation state, and all the inductance devices and capacitance devices used in the wireless power transmission system are ideal elements.
Under the influence of the coupling position of the receiving coil and the transmitting coil, the current between the two receiving coils has three working states of same direction and opposite direction and only one receiving coil has current.
The first working state: the current between the two receiving coils is in the same direction, fig. 5 is a circuit diagram of the two receiving coils provided in embodiment 1 of the present invention, referring to fig. 5, the current directions of the two receiving coils in fig. 5 are in the same direction, and the mutual inductance between the transmitting coil and the first receiving coil is M1Mutual inductance between the transmitter coil and the second receiver coil is M2The magnetic field between the two receiving coils is coupled in the same direction, the mutual inductance between the first receiving coil and the second receiving coil is M, the magnetic field between the coupling inductors in the decoupling device is coupled in the reverse direction, and the mutual inductance between the first inductor and the second inductor is M, so that the coupling between the two receiving coils and the coupling between the coupling inductors are mutually offset.
The second working state: the current between the two receiving coils is in reverse direction, fig. 6 is a circuit diagram of the current reversal of the two receiving coils according to embodiment 1 of the present invention, referring to fig. 6, the current direction of the two receiving coils in fig. 6 is in reverse direction, and the mutual inductance between the transmitting coil and the first receiving coil is M1Mutual inductance between the transmitter coil and the second receiver coil is M2The magnetic field between the two receiving coils is in reverse coupling, the mutual inductance between the first receiving coil and the second receiving coil is M, the magnetic field between the coupling inductors in the decoupling device is in same-direction coupling, and the mutual inductance between the first inductor and the second inductor is M, so that the coupling between the two receiving coils and the coupling between the coupling inductors are mutually offset.
The third working state: only one receiving coil has current, fig. 7 is a circuit diagram of a receiving coil having current according to embodiment 1 of the present invention, and referring to fig. 7, only one receiving coil is in operation, that is, the first receiving coil is in operation in fig. 7, and the mutual inductance between the transmitting coil and the first receiving coil is M1The other receiving coil is located in a receiving loop equivalent to openIn the circuit, that is, the second receiving loop where the second receiving coil is located in fig. 7 is open, and no current flows through both the second receiving coil and the second inductor, so that the existence of the decoupling device, that is, the first inductor and the second inductor has no influence on the third operating state.
Through analyzing three different working states of the two receiving coils, the magnetic coupling between the two receiving coils can be offset by arranging the decoupling device, and for the third working state, the decoupling device has no influence on the normal work of the wireless power transmission system. Therefore, the wireless power transmission system of the present embodiment 1 can maintain a stable operation state.
The magnetic coupling of the two receiving coils is embodied by the mutual inductance of the two receiving coils, and the magnitude of the mutual inductance represents the degree of the magnetic coupling. If the coupling inductance is added to offset the magnetic coupling between the two receiving coils, after the decoupling device is added, the mutual inductance between the first receiving loop where the first receiving coil is located and the second receiving loop where the second receiving coil is located is close to 0. Fig. 8 is a graph of self inductance and mutual inductance in the receiving loop when the decoupling device is not disposed in the two receiving coils according to embodiment 1 of the present invention; fig. 9 is a graph showing the self-inductance and mutual-inductance in the receiving loop when the decoupling device is disposed on two receiving coils according to embodiment 1 of the present invention. A coordinate system is established with the position of the receiver coil, the X-axis represents the movement of the receiver coil in the left-right direction, the Y-axis represents the movement of the receiver coil in the front-back direction, the Z-axis represents the movement of the receiver coil in the up-down direction, the abscissa in fig. 8 and 9 represents the offset of the receiver coil in the X-axis in units of centimeters (cm), and the ordinate represents the inductance value in units of microhenries (μ H). Referring to fig. 8 and 9, it can be found by comparing fig. 8 and 9 that: before the decoupling device is not arranged on the receiving device, when the two receiving coils deviate 0-10cm relative to the transmitting coil in the X-axis direction, the mutual inductance of two receiving loops where the two receiving coils are located fluctuates up and down at 7.5 microhenries; after the decoupling device is arranged, the mutual inductance of the two receiving loops where the two receiving coils are located is within the whole offset range, and the mutual inductance is reduced to be below 0.3 microhenry, and the decoupling of the two receiving loops is realized by arranging the decoupling device on the receiving device.
After the wireless power transmission system provided with the decoupling device and the receiving coils and the coupling inductors in the second connection relation is analyzed, the fact that the working states of the two receiving coils are not affected by the coupling of the two receiving coils after the decoupling device is arranged can be found, the total inductance in the two receiving loops is always kept stable in any working state, and the magnetic coupling between the two receiving coils is offset.
In summary, the wireless power transmission system of this embodiment 1 is provided with the decoupling device, so that the magnetic coupling between the two receiving coils is cancelled, and the mutual inductance and the induced electromotive force generated by the magnetic coupling are eliminated; the wireless power transmission system is enabled to work at a resonance frequency point all the time, the reliability and the safety of the operation of the wireless power transmission system are guaranteed, and meanwhile the area of the receiving device is reduced.
Example 2
The present embodiment 2 provides a decoupling device for a wireless power transmission system, and the difference between the present embodiment 2 and the embodiment 1 is that the medium wireless power transmission system of the present embodiment 2 includes two transmitting coils. Fig. 10 is a circuit block diagram of a wireless power transmission system according to embodiment 2 of the present invention; fig. 11 is a circuit diagram of a decoupling device provided in embodiment 2 of the present invention. Referring to fig. 10 and 11, the decoupling device of the wireless power transmission system of the embodiment 2 is applied to a wireless power transmission system, and the wireless power transmission system includes: direct current source 1, square wave generator 2, primary side compensation network 3 and first transmitting coil LP1A second transmitting coil LP2A receiving device and a load 10.
The receiving apparatus includes: the device comprises a receiving coil, a secondary side compensation network and a rectification filter circuit. The receiving coil is a double receiving coil, i.e. the receiving coil comprises a first receiving coil LS1And a second receiving coil LS2. The number of the secondary side compensation networks is two, namely the secondary side compensation networks comprise: a first subsidiary compensation network 6 and a second subsidiary compensation network 7. The number of the rectifying and filtering circuits is two, namely the rectifying and filtering circuit comprises: a first rectifying-filtering circuit 8 and a second rectifying-filtering circuit 9.
The decoupling device comprises: transmission decoupling device 11 and reception decoupling device12, placing; the transmitting decoupling device comprises a third inductor 13 and a fourth inductor 14, and the receiving decoupling device comprises a first inductor L1And a second inductance L2. The third inductor and the fourth inductor form a coupling inductor, the first inductor and the second inductor form a coupling inductor, the coupling inductor is wound by a litz wire, and a coupling medium between the coupling inductors can be a magnetic core or air.
The output end of the direct current source is electrically connected with the input end of the square wave generator.
The output end of the square wave generator is electrically connected with the input end of the primary side compensation network.
The output end of the primary side compensation network is electrically connected with the input ends of the first transmitting coil and the second transmitting coil.
The first transmitting coil and the second transmitting coil are respectively arranged corresponding to the first receiving coil and the second receiving coil, the first transmitting coil is respectively coupled with the first receiving coil and the second receiving coil, namely, the first transmitting coil is coupled with the first receiving coil, the first transmitting coil is coupled with the second receiving coil, the second transmitting coil is respectively coupled with the first receiving coil and the second receiving coil, namely, the second transmitting coil is coupled with the first receiving coil, and the second transmitting coil is coupled with the second receiving coil; the first transmitting coil and the second transmitting coil are respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling. The first transmitting coil and the second transmitting coil are respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling.
There is coupling between first transmitting coil and the second transmitting coil, sets up the decoupling zero device of transmission between first transmitting coil and the second transmitting coil.
The first end of the first transmitting coil is electrically connected with the output end of the primary side compensation network, the second end of the first transmitting coil is electrically connected with the first end of the third inductor, and the second end of the third inductor is electrically connected with the output end of the primary side compensation network.
The first end of the second transmitting coil is electrically connected with the first end of the fourth inductor, the second end of the fourth inductor is electrically connected with the output end of the primary side compensation network, and the second end of the second transmitting coil is electrically connected with the output end of the primary side compensation network.
The third inductor is coupled with the fourth inductor, and conductors of the third inductor and the fourth inductor are litz wires.
Mutual inductance generated by magnetic coupling between the first transmitting coil and the second transmitting coil is equal to mutual inductance generated by magnetic coupling between the third inductor and the fourth inductor; in practical application, the mutual inductance between the third inductor and the fourth inductor is equal to the mutual inductance between the first transmitting coil and the second transmitting coil by determining the number of turns of the winding of the third inductor and the fourth inductor and adjusting the air gap, so that the purpose of mutual cancellation of magnetic coupling is achieved.
The first receiving coil and the second receiving coil are coupled and connected, the first receiving coil and the second receiving coil are coupled, and a receiving decoupling device is arranged between the first receiving coil and the second receiving coil.
The first end of the first receiving coil is electrically connected with the input end of the first secondary side compensation network, the second end of the first receiving coil is electrically connected with the first end of the first inductor, and the second end of the first inductor is electrically connected with the input end of the first secondary side compensation network.
The first end of the second receiving coil is electrically connected with the first end of the second inductor, the second end of the second inductor is electrically connected with the input end of the second secondary compensation network, and the second end of the second receiving coil is electrically connected with the input end of the second secondary compensation network.
The first inductor is coupled with the second inductor, and conductors of the first inductor and the second inductor are litz wires.
The mutual inductance generated by the magnetic coupling between the first receiving coil and the second receiving coil is equal to the mutual inductance generated by the magnetic coupling between the first inductor and the second inductor, that is, the mutual inductance of the first receiving coil and the second receiving coil is M, and the mutual inductance of the first inductor and the second inductor is also M. In practical application, the mutual inductance between the first inductor and the second inductor is equal to the mutual inductance between the first receiving coil and the second receiving coil by determining the number of turns of the winding of the first inductor and the second inductor and adjusting the air gap, so that the purpose of mutual cancellation of magnetic coupling is achieved. Meanwhile, in practical application, the mutual inductance of the third inductor and the fourth inductor is equal to the mutual inductance of the first transmitting coil and the second transmitting coil, and the mutual inductance of the first inductor and the second inductor is equal to the mutual inductance of the first receiving coil and the second receiving coil by selecting the number of strands of the litz wires, the type of the magnetic core of the coupling inductor, the number of winding turns of the litz wires and the air gap between the magnetic cores.
The output end of the first secondary compensation network is electrically connected with the input end of the first rectifying and filtering circuit. The first receiving coil, the first secondary side compensation network and the first rectifying and filtering circuit are a first receiving loop.
And the output end of the second secondary side compensation network is electrically connected with the input end of the second rectification filter circuit. The second receiving coil, the second secondary side compensation network and the second rectification filter circuit are a second receiving loop.
The output end of the first rectifying and filtering circuit and the output end of the second rectifying and filtering circuit are both electrically connected with the input end of the load.
The direct current source generates square wave voltage with fixed frequency through the square wave generator, the primary side compensation network is respectively matched with the inductances of the first transmitting coil and the second transmitting coil, and the secondary side compensation network is matched with the receiving coil after the decoupling device is connected in series, so that the wireless power transmission system works in a normal resonance state.
Since there are attributes of the homonymous terminal and the synonym terminal between the transmitting coils, this embodiment 2 further provides two specific connection relationships among the first transmitting coil, the second transmitting coil, the third inductor, and the fourth inductor:
the first connection relationship is that the synonym end of the coupling inductor is connected with the homonymous ends of the two transmitting coils, namely the first end of the first transmitting coil and the first end of the second transmitting coil are synonym ends; the first end of the third inductor and the first end of the fourth inductor are synonym terminals.
The second connection relationship is that the homonymous end of the coupling inductor is connected with the synonym ends of the two transmitting coils, namely the first end of the first transmitting coil and the first end of the second transmitting coil are homonymous ends; the first end of the third inductor and the first end of the fourth inductor are dotted terminals.
Since there are attributes of the homonymous terminal and the synonym terminal between the receiving coils, this embodiment 2 further provides two specific connection relationships among the first receiving coil, the second receiving coil, the first inductor, and the second inductor:
the first connection relationship is that the synonym end of the coupling inductor is connected with the homonymous ends of the two receiving coils, namely the first end of the first receiving coil and the first end of the second receiving coil are synonym ends; the first end of the first inductor and the first end of the second inductor are synonym ends.
The second connection relationship is that the homonymous end of the coupling inductor is connected with the synonym ends of the two receiving coils, namely the first end of the first receiving coil and the first end of the second receiving coil are homonymous ends; the first end of the first inductor and the first end of the second inductor are dotted terminals.
In summary, in this embodiment 2, by providing the decoupling device in the wireless power transmission system, the magnetic coupling between the two transmitting coils is cancelled, the magnetic coupling between the two receiving coils is cancelled, and the mutual inductance and the induced electromotive force generated by the magnetic coupling are eliminated; the wireless power transmission system is enabled to work at the resonant frequency point all the time, and the reliability and the safety of the operation of the wireless power transmission system are guaranteed. Compared with the prior art, the wireless power transmission system of the embodiment 2 has the advantages that the decoupling device is arranged, so that the magnetic coupling between the two transmitting coils is offset, the magnetic coupling between the two receiving coils is offset, and the area of the receiving device is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A decoupling device of a wireless power transmission system is characterized in that the decoupling device is applied to the wireless power transmission system, and the wireless power transmission system comprises: the device comprises a direct current source, a square wave generator, a primary side compensation network, a transmitting coil, a receiving device and a load;
the receiving apparatus includes: the first receiving coil, the second receiving coil, the first secondary compensation network, the second secondary compensation network, the first rectifying and filtering circuit and the second rectifying and filtering circuit;
the decoupling apparatus includes: a first inductor and a second inductor;
the output end of the direct current source is electrically connected with the input end of the square wave generator;
the output end of the square wave generator is electrically connected with the input end of the primary side compensation network;
the output end of the primary side compensation network is electrically connected with the input end of the transmitting coil;
the transmitting coil is respectively arranged corresponding to the first receiving coil and the second receiving coil, and the transmitting coil and the first receiving coil and the transmitting coil and the second receiving coil are coupled; the transmitting coil is respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling;
there is coupling between the first receiving coil and the second receiving coil, and the decoupling device is arranged between the first receiving coil and the second receiving coil;
a first end of the first receiving coil is electrically connected with an input end of the first secondary side compensation network, a second end of the first receiving coil is electrically connected with a first end of the first inductor, and a second end of the first inductor is electrically connected with an input end of the first secondary side compensation network;
a first end of the second receiving coil is electrically connected with a first end of the second inductor, a second end of the second inductor is electrically connected with an input end of the second secondary compensation network, and a second end of the second receiving coil is electrically connected with an input end of the second secondary compensation network;
the first inductor is coupled with the second inductor;
a mutual inductance between the first receive coil and the second receive coil is equal to a mutual inductance between the first inductance and the second inductance;
the output end of the first secondary compensation network is electrically connected with the input end of the first rectification filter circuit;
the output end of the second secondary side compensation network is electrically connected with the input end of the second rectification filter circuit;
the output end of the first rectifying and filtering circuit and the output end of the second rectifying and filtering circuit are electrically connected with the input end of the load.
2. The decoupling apparatus of claim 1, wherein the first end of the first receive coil and the first end of the second receive coil are synonym terminals;
the first end of the first inductor and the first end of the second inductor are synonym ends.
3. The decoupling apparatus of claim 1, wherein the first end of the first receive coil and the first end of the second receive coil are homonymous ends;
the first end of the first inductor and the first end of the second inductor are dotted terminals.
4. A decoupling device of a wireless power transmission system is characterized in that the decoupling device is applied to the wireless power transmission system, and the wireless power transmission system comprises: the device comprises a direct current source, a square wave generator, a primary side compensation network, a first transmitting coil, a second transmitting coil, a receiving device and a load;
the receiving apparatus includes: the first receiving coil, the second receiving coil, the first secondary compensation network, the second secondary compensation network, the first rectifying and filtering circuit and the second rectifying and filtering circuit;
the decoupling apparatus includes: a transmitting decoupling device and a receiving decoupling device; the transmitting decoupling device comprises a third inductor and a fourth inductor, and the receiving decoupling device comprises a first inductor and a second inductor;
the output end of the direct current source is electrically connected with the input end of the square wave generator;
the output end of the square wave generator is electrically connected with the input end of the primary side compensation network;
the output end of the primary side compensation network is electrically connected with the input ends of the first transmitting coil and the second transmitting coil;
the first transmitting coil and the second transmitting coil are respectively arranged corresponding to the first receiving coil and the second receiving coil, the first transmitting coil is respectively coupled with the first receiving coil and the second receiving coil, and the second transmitting coil is respectively coupled with the first receiving coil and the second receiving coil; the first transmitting coil and the second transmitting coil are respectively in energy transfer with the first receiving coil and the second receiving coil through magnetic coupling;
there is coupling between the first transmitting coil and the second transmitting coil, and the transmitting decoupling device is arranged between the first transmitting coil and the second transmitting coil;
the first end of the first transmitting coil is electrically connected with the output end of the primary side compensation network, the second end of the first transmitting coil is electrically connected with the first end of the third inductor, and the second end of the third inductor is electrically connected with the output end of the primary side compensation network;
the first end of the second transmitting coil is electrically connected with the first end of the fourth inductor, the second end of the fourth inductor is electrically connected with the output end of the primary side compensation network, and the second end of the second transmitting coil is electrically connected with the output end of the primary side compensation network;
the third inductor is coupled with the fourth inductor;
a mutual inductance between the first transmit coil and the second transmit coil is equal to a mutual inductance between the third inductance and the fourth inductance;
there is coupling between the first receiving coil and the second receiving coil, and the receiving decoupling device is arranged between the first receiving coil and the second receiving coil;
a first end of the first receiving coil is electrically connected with an input end of the first secondary side compensation network, a second end of the first receiving coil is electrically connected with a first end of the first inductor, and a second end of the first inductor is electrically connected with an input end of the first secondary side compensation network;
a first end of the second receiving coil is electrically connected with a first end of the second inductor, a second end of the second inductor is electrically connected with an input end of the second secondary compensation network, and a second end of the second receiving coil is electrically connected with an input end of the second secondary compensation network;
the first inductor is coupled with the second inductor;
a mutual inductance between the first receive coil and the second receive coil is equal to a mutual inductance between the first inductance and the second inductance;
the output end of the first secondary compensation network is electrically connected with the input end of the first rectification filter circuit;
the output end of the second secondary side compensation network is electrically connected with the input end of the second rectification filter circuit;
the output end of the first rectifying and filtering circuit and the output end of the second rectifying and filtering circuit are electrically connected with the input end of the load.
5. The decoupling apparatus of claim 4, wherein the first end of the first transmit coil and the first end of the second transmit coil are synonym ends;
the first end of the third inductor and the first end of the fourth inductor are synonym terminals.
6. The decoupling apparatus of claim 4 wherein the first end of the first transmit coil and the first end of the second transmit coil are homonymous ends;
the first end of the third inductor and the first end of the fourth inductor are dotted terminals.
7. The decoupling apparatus of claim 4, wherein the first end of the first receive coil and the first end of the second receive coil are synonym terminals;
the first end of the first inductor and the first end of the second inductor are synonym ends.
8. The decoupling apparatus of claim 4, wherein the first end of the first receive coil and the first end of the second receive coil are homonymous ends;
the first end of the first inductor and the first end of the second inductor are dotted terminals.
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| CN109245231A (en) * | 2018-10-29 | 2019-01-18 | 浙江大学 | A kind of wireless charging topological structure with nature constant pressure and flow output characteristics |
| CN110048520A (en) * | 2019-05-08 | 2019-07-23 | 燕山大学 | Primary side has the wireless charging device of C-LCC compensation network |
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| CN109245231A (en) * | 2018-10-29 | 2019-01-18 | 浙江大学 | A kind of wireless charging topological structure with nature constant pressure and flow output characteristics |
| CN110048520A (en) * | 2019-05-08 | 2019-07-23 | 燕山大学 | Primary side has the wireless charging device of C-LCC compensation network |
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Effective date of registration: 20210623 Address after: No. 200, Deyuan West Road, high tech Development Zone, Xinxiang City, Henan Province Patentee after: XINXIANG TAIHANG JIAXIN ELECTRICAL TECHNOLOGY Co.,Ltd. Address before: No.438, west section of Hebei Street, Haigang District, Qinhuangdao City, Hebei Province Patentee before: Yanshan University |