CN111740506A - Design method of three-coil wireless power transmission system with stable voltage gain - Google Patents
Design method of three-coil wireless power transmission system with stable voltage gain Download PDFInfo
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- CN111740506A CN111740506A CN202010641949.5A CN202010641949A CN111740506A CN 111740506 A CN111740506 A CN 111740506A CN 202010641949 A CN202010641949 A CN 202010641949A CN 111740506 A CN111740506 A CN 111740506A
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
Abstract
The invention discloses a design method of a three-coil wireless power transmission system with stable voltage gain, which comprises the following steps of firstly, determining the shape of a coil and the number of turns of the coil according to the design of the two-coil wireless power transmission system; and then splitting the transmitting coil into a transmitting coil and a relay coil of a three-coil system, determining and obtaining the compensation capacitance of each coil in the three-coil system by taking the receiving coil as the receiving coil of the three-coil system according to a certain sequence, obtaining the three-coil wireless electric energy transmission system with stable voltage gain if the fluctuation range of the system voltage gain does not exceed 10% when the coil is deviated to the maximum deviation position, and otherwise, reselecting the turn number of the transmitting coil in the three-coil system. In addition, on the basis of meeting the requirement of stable voltage gain, the method can also enable the efficiency of the system to be higher as much as possible, and has important significance for popularization and use of wireless power transmission.
Description
Technical Field
The invention relates to a wireless power transmission technology, in particular to a design method of a three-coil wireless power transmission system with stable voltage gain.
Background
Compared with the traditional wired power transmission technology, the wireless power transmission technology is safer and more convenient, so that the wireless power transmission technology is widely applied to various electric equipment, such as mobile terminals, medical equipment, electric automobiles and the like. Currently common wireless power transmission systems include two-coil systems, three-coil systems, and LCC-S systems. When the coil is deviated, the voltage gain of the system is often unstable along with the increase of the deviation distance, and for a three-coil system, the research finds that the three-coil system obtained by adopting a specific design can still keep stable voltage gain when the coil is deviated, so that the three-coil system is suitable for more use scenes of wireless power transmission technology.
Accordingly, there is provided a design method of a three-coil wireless power transmission system, which can effectively stabilize a voltage gain of the system when a coil is offset, and is intended to promote the three-coil wireless power transmission system.
Disclosure of Invention
The invention aims to provide a design method of a three-coil wireless power transmission system with stable voltage gain.
The invention provides a design method of a three-coil wireless power transmission system with stable voltage gain. The three-coil wireless power transmission system comprises a transmitting coil, a relay coil and a receiving coil. The transmitting coil and the relay coil are positioned on the same plane, and the transmitting coil and the relay coil are obtained by dividing the transmitting coil in the two-coil wireless electric energy transmission system. The coil includes but is not limited to a planar circular coil, a rectangular coil, a DD coil, and the like. The stable voltage gain of the three-coil system needs to meet the requirement that the fluctuation range of the voltage gain does not exceed 10% when the coil is deflected to the maximum deflection position (namely, the deflection is over against the position +/-100 mm).
The design method comprises the following steps:
the method comprises the following steps: determining the shape of a coil and the number of turns of the coil according to the anti-offset output requirement of the system (namely the output voltage and the output power requirement of the system at the maximum offset position) and the design of the two-coil wireless power transmission system; the design methods of the two-coil wireless power transmission systems are mature and are the prior art, and are not described herein again;
step two: selecting the number of turns of a transmitting coil in a three-coil system to be not more than half of the number of turns of the transmitting coil in the two-coil system, taking the rest part of the transmitting coil in the two-coil system as a relay coil of the three-coil system, and measuring the inductance of each coil in the three-coil system and the change curve of the mutual inductance between the coils along with the offset distance by adopting the number of turns of a receiving coil in the two-coil system;
step three: and designing the compensation capacitance of each coil in the three-coil system according to the inductance of each coil at the maximum offset position in the three-coil system obtained by measurement in the step two and the mutual inductance between the coils at the position as follows: 1) the compensation capacitor of the receiving coil resonates with the inductance of the receiving coil, namely the resonance capacitor; 2) calculating the compensation capacitance of the relay coil and the resonance capacitance of the relay coil which meet the maximum efficiency in the current three-coil system, and selecting the optimal compensation capacitance of the relay coil between the maximum efficiency compensation capacitance and the resonance capacitance; 3) calculating the compensation capacitance of the transmitting coil according to the inductance, mutual inductance and capacitance parameters, so that the compensation capacitance of the transmitting coil meets a zero phase angle, namely the imaginary part of the input impedance of the current three-coil system is zero;
step four: and (3) calculating the voltage gain of the three-coil system during the deflection by using a voltage gain formula, if the coil deflects to the maximum deflection position, the fluctuation range of the system voltage gain does not exceed 10%, obtaining the three-coil wireless electric energy transmission system with stable voltage gain, and otherwise, returning to the step two, and reselecting the turn number of the transmitting coil in the three-coil system.
Furthermore, after a three-coil wireless power transmission system with stable voltage gain is obtained, the number of turns of a receiving coil is further adjusted, compensation capacitors of the coils are modified to meet the condition of the step three, the efficiency of the three-coil system in the deviation process is calculated by using an efficiency formula, the system efficiency is the highest at the moment, then the voltage gain of the three-coil system in the deviation process is calculated again according to the voltage gain formula, if the coil deviates to the maximum deviation position, the fluctuation range of the system voltage gain does not exceed 10%, the design is completed, otherwise, the step is repeated, and the number of turns of the receiving coil in the three-coil system is reselected.
The invention has the beneficial effects that:
aiming at the three-coil wireless power transmission system, the voltage gain of the three-coil wireless power transmission system can be stabilized when the coil deviates by adopting the design method of the invention, in addition, the efficiency of the system can be made higher as much as possible on the basis of satisfying the voltage gain stabilization, and the method of the invention has important significance for the popularization and the use of the wireless power transmission.
The details of an implementation of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Features, aspects, and advantages of which will become apparent from the description, the drawings, and the claims. It should be noted that the relative dimensions of the following figures may not be drawn to scale.
Drawings
Fig. 1 is a functional structure block diagram of a three-coil wireless power transmission system according to all exemplary embodiments of the present invention.
FIG. 2 is a block diagram of the design process of the present invention.
FIG. 3 is a voltage gain simulation diagram for verification of design results according to one embodiment of the design flow described in FIG. 2.
FIG. 4 is a simulation diagram of the efficiency of design result verification according to an embodiment of the design flow illustrated in FIG. 2.
FIG. 5 is an input current simulation diagram for verification of design results according to one embodiment of the design flow described in FIG. 2.
Detailed Description
The detailed description set forth below in connection with the appended drawings is intended as a description of exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The term "exemplary" used throughout this description means "serving as an example, instance, or illustration," and should not necessarily be construed as preferred or advantageous over other exemplary embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of exemplary embodiments of the invention. In some instances, some devices are shown in block diagram form.
Fig. 1 is a functional structure block diagram of a three-coil wireless power transmission system according to all exemplary embodiments of the present invention. The power transmitter 110 comprises a driving power supply 101, a compensation network 102 and a transmitting coil 103. The driving power supply 101 outputs a high frequency alternating current to the compensation network 102 and the transmitting coil 103, thereby causing the power transmitter 110 to generate a high frequency alternating magnetic field. The compensation network 102 may include capacitors and/or inductors, often in the form of compensation capacitors in series with the transmit coil. The power relay transmitter 111 includes a compensation network 104 and a relay coil 105. The compensation network 104 may include capacitors and/or inductors, often in the form of compensation capacitors in series with the relay coil. The power receiver 112 includes a receive coil 107, a compensation network 106, and a rectifier 108. The receiving coil 107 generates a high-frequency alternating current by a high-frequency alternating magnetic field generated by the power transmitter 110 and the power relay transmitter 111, and inputs the high-frequency alternating current to the rectifier 108 after passing through the compensation network 106. The compensation network 106 may include capacitors and/or inductors, often in the form of compensation capacitors in series with the transmit coil. The rectifier 108 rectifies the high-frequency alternating current into direct current and supplies the electric power to the load 109, thereby enabling wireless transmission of the electric power.
The transmit coil 103, the relay coil 105 and the receive coil 107 may be configured to comprise an air core or a solid core, such as a ferrite core. A coil containing a ferrite core may better transfer energy from the power transmitter 110 and the power relay transmitter 111 to the power receiver 112.
FIG. 2 is a block diagram of the design process of the present invention. As shown in the figure, the design method is as follows:
the method comprises the following steps: determining the shape of a coil and the number of turns of the coil according to the anti-offset output requirement of the system and the design of a two-coil wireless power transmission system;
step two: selecting the number of turns of a transmitting coil in a three-coil system to be not more than half of the number of turns of the transmitting coil in the two-coil system, taking the rest part of the transmitting coil in the two-coil system as a relay coil of the three-coil system, and measuring the inductance of each coil in the three-coil system and the change curve of the mutual inductance between the coils along with the offset distance by adopting the number of turns of a receiving coil in the two-coil system;
step three: and (3) designing the compensation capacitance of each coil in the three-coil system according to the inductance of each coil at the maximum offset position (offset opposite to the position of 100mm) in the three-coil system obtained by the measurement in the step two and the mutual inductance between the coils at the position in the three-coil system in the following sequence: 1) the compensation capacitor of the receiving coil resonates with the inductance of the receiving coil, namely the resonance capacitor; 2) calculating the compensation capacitance of the relay coil and the resonance capacitance of the relay coil which meet the maximum efficiency in the current three-coil system, and selecting the optimal compensation capacitance of the relay coil between the maximum efficiency compensation capacitance and the resonance capacitance; 3) calculating the compensation capacitance of the transmitting coil according to the inductance, mutual inductance and capacitance parameters, so that the compensation capacitance of the transmitting coil meets a zero phase angle, namely the imaginary part of the input impedance of the current three-coil system is zero;
step four: and (3) calculating the voltage gain of the three-coil system during the deflection by using a voltage gain formula, if the coil deflects to the maximum deflection position, the fluctuation range of the system voltage gain does not exceed 10%, obtaining the three-coil wireless electric energy transmission system with stable voltage gain, and otherwise, returning to the step two, and reselecting the turn number of the transmitting coil in the three-coil system.
The voltage gain formula is
Wherein, UoutIs the output voltage of the system, UinIs the input voltage of the system.
Furthermore, after a three-coil wireless power transmission system with stable voltage gain is obtained, the number of turns of a receiving coil is further adjusted, compensation capacitors of the coils are modified to meet the condition of the step three, the efficiency of the three-coil system in the deviation process is calculated by using an efficiency formula, the system efficiency is the highest at the moment, then the voltage gain of the three-coil system in the deviation process is calculated again according to the voltage gain formula, if the coil deviates to the maximum deviation position, the fluctuation range of the system voltage gain does not exceed 10%, the design is completed, otherwise, the step is repeated, and the number of turns of the receiving coil in the three-coil system is reselected.
The efficiency formula is
Wherein, PoutIs the output power of the system, PinIs the input power of the system.
According to the design process described in fig. 2, taking the output requirement of the maximum offset position (offset facing position 100mm) to output ac voltage 400V and output power 3.3kW as an example, the coil of the two-coil system is designed to use 350 strands of litz wire, the coil part includes a magnetic core, is unshielded, and is shaped as a rectangular coil, at this time, the outer diameter of the coil is 380mm, the inner diameter is 150mm, the number of turns is 31, and the transmitting coil and the receiving coil are symmetric coils.
Selecting a three-coil system with the transmitting coil having 5 turns, the outer diameter of 380mm and the inner diameter of 344.8 mm; the rest of the turns of the transmitting coil in the two-coil system are used as a relay coil of the three-coil system, namely the number of the turns of the relay coil is 26, the outer diameter of the relay coil is 344.8mm, and the inner diameter of the relay coil is 150 mm; the number of turns of the receiving coil of the three-coil system is consistent with that of the receiving coil of the two-coil system, namely 31 turns; and measuring the curves of the inductance of each coil in the three-coil system and the mutual inductance between the coils along with the change of the offset distance under the condition of the number of turns. According to the parameter values of the three-coil system at the maximum offset, the compensation capacitance of the receiving coil is set to be 6.12nF, the compensation capacitance of the relay coil is set to be 7.9nF, and the compensation capacitance of the transmitting coil is set to be 57.41 nF. And calculating the voltage gain of each position when the current three-coil system is deviated, wherein the maximum voltage gain is 1.035, the minimum voltage gain is 1.01, and obviously the fluctuation is less than 10 percent, namely the three-coil system meets the requirement of stabilizing the voltage gain.
Further optimizing the efficiency of the three-coil system, and adjusting the number of turns of the receiving coil to be 26, wherein the outer diameter of the receiving coil is 380mm and the inner diameter of the receiving coil is 150 mm; the compensation capacitance of the receiving coil is configured to be 8.69nF, the compensation capacitance of the relay coil is configured to be 7.9nF, and the compensation capacitance of the transmitting coil is configured to be 41.32 nF; the efficiency in the excursion is higher than the former case, and the fluctuation range of the system voltage gain in the excursion does not exceed 10%, so the current three-coil system is taken as the design result.
FIG. 3 is a voltage gain simulation plot of design result verification for the specific embodiment. As shown, 301 is a three coil system, 302 is an LCC-S system, and 303 is a two coil system. It is apparent that the voltage gain of the three coil system designed by this patent exhibits a steady state with coil excursion (i.e., the voltage gain maximum differs from the minimum by less than 10%), while the voltage gain of the two coil system and the LCC-S system exhibits an unstable state with coil excursion.
Fig. 4 is an efficiency simulation diagram of the design result verification of the embodiment. As shown, 401 is a three coil system, 402 is an LCC-S system, and 403 is a two coil system. It is apparent that the efficiency of the three coil system is now intermediate between the two coil system and the LCC-S system, and that current three coil system designs can achieve practical purposes.
FIG. 5 is an input current simulation plot for design result verification for the specific embodiment. As shown, 501 is a three coil system, 502 is an LCC-S system, and 503 is a two coil system. It is apparent that the maximum input current of the three-coil system is less than 10A at this time, and the input current is stable at the time of the offset.
In summary, all the design result verification diagrams of the embodiments are considered, and a three-coil wireless power transmission system with stable voltage gain can be designed according to the design scheme of the invention.
Various modifications to the above-described embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A design method of a three-coil wireless power transmission system with stable voltage gain is characterized by comprising the following steps:
the method comprises the following steps: determining the shape of a coil and the number of turns of the coil according to the anti-offset output requirement of the system and the design of a two-coil wireless power transmission system;
step two: selecting the number of turns of a transmitting coil in a three-coil system to be not more than half of the number of turns of the transmitting coil in the two-coil system, taking the rest part of the transmitting coil in the two-coil system as a relay coil of the three-coil system, and measuring the inductance of each coil in the three-coil system and the change curve of the mutual inductance between the coils along with the offset distance by adopting the number of turns of a receiving coil in the two-coil system;
step three: and designing the compensation capacitance of each coil in the three-coil system according to the inductance of each coil at the maximum offset position in the three-coil system obtained by measurement in the step two and the mutual inductance between the coils at the position as follows:
1) the compensation capacitor of the receiving coil resonates with the inductance of the receiving coil, namely the resonance capacitor;
2) calculating the compensation capacitance of the relay coil and the resonance capacitance of the relay coil which meet the maximum efficiency in the current three-coil system, and selecting the optimal compensation capacitance of the relay coil between the maximum efficiency compensation capacitance and the resonance capacitance;
3) calculating the compensation capacitance of the transmitting coil according to the inductance, mutual inductance and capacitance parameters, so that the compensation capacitance of the transmitting coil meets a zero phase angle, namely the imaginary part of the input impedance of the current three-coil system is zero;
step four: and (3) calculating the voltage gain of the three-coil system during the deflection by using a voltage gain formula, if the coil deflects to the maximum deflection position, the fluctuation range of the system voltage gain does not exceed 10%, obtaining the three-coil wireless electric energy transmission system with stable voltage gain, and otherwise, returning to the step two, and reselecting the turn number of the transmitting coil in the three-coil system.
2. A method for designing a three-coil wireless power transmission system with stable voltage gain as claimed in claim 1, wherein said anti-excursion requirement is the output power and output voltage requirement of the coil at the excursion facing position ± 100 mm.
3. The method of claim 1, wherein after obtaining a three-coil wireless power transmission system with stable voltage gain, further adjusting the number of turns of the receiving coil and modifying the compensation capacitance of each coil to satisfy the condition of step three, calculating the efficiency of the three-coil system when it is shifted by using the efficiency formula so that the system efficiency is the highest, and then calculating the voltage gain of the three-coil system when it is shifted by using the voltage gain formula again, wherein if the coil is shifted to the maximum shift, the fluctuation range of the system voltage gain is not more than 10%, the design is completed, otherwise, the step is repeated, that is, the number of turns of the receiving coil in the three-coil system is reselected.
4. A method of designing a three coil wireless power transfer system with stable voltage gain as claimed in claim 1, wherein the coil shapes include but are not limited to planar circular coil, rectangular coil and DD coil.
5. A method of designing a three-coil wireless power transfer system with stabilized voltage gain as claimed in claim 1, wherein said coil is an air-core coil or a solid-core coil.
6. A method of designing a three coil wireless power transfer system with stable voltage gain as claimed in claim 1, wherein said coil has a ferrite core.
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| CN112260414A (en) * | 2020-10-14 | 2021-01-22 | 浙江大学 | Wireless power transmission device using three-coil structure to improve anti-deviation capability |
| CN113162253A (en) * | 2021-04-23 | 2021-07-23 | 上海科技大学 | Planar wireless charging transmitter based on relay coil |
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| CN111740506B (en) | 2022-02-08 |
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