CN108512317B - Method and device for determining number of electric energy receiving terminals in wireless electric energy transmission system - Google Patents

Method and device for determining number of electric energy receiving terminals in wireless electric energy transmission system Download PDF

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CN108512317B
CN108512317B CN201810291851.4A CN201810291851A CN108512317B CN 108512317 B CN108512317 B CN 108512317B CN 201810291851 A CN201810291851 A CN 201810291851A CN 108512317 B CN108512317 B CN 108512317B
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electric energy
transmission system
receiving end
energy transmission
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CN108512317A (en
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李莉
黄禹铭
林鸿高
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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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

Abstract

The embodiment of the invention provides a method and a device for determining the number of electric energy receiving ends in a wireless electric energy transmission system, wherein the method comprises the following steps: determining an electric energy sending end and an electric energy receiving end to be adopted in a target wireless electric energy transmission system to be designed; determining a circuit model corresponding to a target wireless power transmission system based on an electric energy sending end and an electric energy receiving end; calculating the coupling coefficient of the electric energy sending end and each electric energy receiving end in the circuit model, and calculating the load quality factor of the electric energy sending end and each electric energy receiving end; and calculating the value of N based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained by calculation. The embodiment of the invention is applied to determine the number of the electric energy receiving ends in the wireless electric energy transmission system, so that the electric energy transmission performance of the wireless electric energy transmission system can be improved.

Description

Method and device for determining number of electric energy receiving terminals in wireless electric energy transmission system
Technical Field
The invention relates to the technical field of energy transmission, in particular to a method and a device for determining the number of electric energy receiving terminals in a wireless electric energy transmission system.
Background
Wireless Power Transfer (WPT) systems often include a power transmitting end and a plurality of power receiving ends. The electric energy transmitting end can transmit electric energy to the electric energy receiving end in the system simultaneously through a non-wire and non-contact method, so that the electric energy transmission is more flexible and safer.
The inventors found that when the number of power receiving ends in the wireless power transmission system is larger, the energy transmission efficiency of the system is higher, but the received energy (i.e., output power) of each power receiving end is smaller. However, when designing a wireless power transmission system, the number of power receiving terminals is often set at will, and this design method cannot balance the power transmission efficiency of the system and the output power of each power receiving terminal.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for determining the number of power receiving terminals in a wireless power transmission system, so as to balance the power transmission efficiency of the wireless power transmission system and the output power of each power receiving terminal in the system, thereby improving the power transmission performance of the system.
In a first aspect, an embodiment of the present invention provides a method for determining the number of power receiving terminals in a wireless power transmission system, where the method may include:
determining an electric energy sending end and an electric energy receiving end to be adopted in a target wireless electric energy transmission system to be designed;
determining a circuit model corresponding to a target wireless power transmission system based on an electric energy sending end and an electric energy receiving end; the circuit model comprises an electric energy sending end and N electric energy receiving ends;
calculating the coupling coefficient of the electric energy sending end and each electric energy receiving end in the circuit model, and calculating the load quality factor of the electric energy sending end and each electric energy receiving end;
calculating the value of N based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained by calculation; the first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value.
Optionally, after the step of calculating the value of N based on the calculated coupling coefficient, the load quality factor, and a preset first receiving end number calculation formula, the method may further include:
judging whether the output power of each electric energy receiving end in the N electric energy receiving ends is smaller than the lowest output power of the corresponding electric energy receiving end or not based on the calculated N value;
and if the output power of the receiving end is smaller than the lowest output power of the corresponding electric energy receiving end, updating the calculated value of the preset second receiving end number calculation formula to obtain the N value.
Optionally, the first receiving end number calculation formula is as follows:
Figure BDA0001617741390000021
wherein N is at the power receiving end of the target wireless power transmission systemThe number of the cells; λ is a preset energy transmission efficiency gain coefficient; mu is a preset output power gain coefficient; k is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the target wireless electric energy transmission system; q is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the target wireless electric energy transmission system; qsThe load quality factor of the power transmitting end in the target wireless power transmission system is obtained.
Optionally, the step of obtaining the first receiving end number calculation formula may include:
calculating the output power of each electric energy receiving end in a preset wireless electric energy transmission system, and calculating the energy transmission efficiency of the preset wireless electric energy transmission system; the preset wireless power transmission system comprises X identical power receiving ends;
calculating energy transmission efficiency gain of the preset wireless power transmission system when X identical power receiving ends exist in the preset wireless power transmission system, compared with the situation that a single power receiving end exists in the preset wireless power transmission system;
calculating the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, compared with the situation that a single electric energy receiving end exists in the preset wireless electric energy transmission system;
generating an energy transmission efficiency-output power combined gain coefficient calculation formula based on the energy transmission efficiency gain, the output power gain, the energy transmission efficiency gain coefficient and the output power gain coefficient;
obtaining an intermediate calculation formula for calculating the maximum value obtained by X energy based on an energy transmission efficiency-output power combined gain coefficient calculation formula;
and converting to obtain a first receiving end number calculation formula based on the intermediate calculation formula.
Alternatively, the energy transfer efficiency-output power joint gain coefficient calculation formula may be:
Figure BDA0001617741390000031
wherein G is an energy transmission efficiency-output power joint gain coefficient; gηEnergy transfer efficiency gain; gPFor output power gain ηX-loadη, when X identical power receiving ends exist in the preset wireless power transmission system, the energy transmission efficiency of the wireless power transmission system is preset1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the wireless electric energy transmission system is preset; pX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the wireless electric energy transmission system is preset; p1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the wireless electric energy transmission system is preset; k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system; q' is an on-load quality factor determined based on the on-load quality factor of an electric energy receiving end in a preset wireless electric energy transmission system; qs' is the preset load quality factor of the electric energy transmitting end in the wireless electric energy transmission system; v. ofs' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
Optionally, the second receiving end number calculation formula may be:
Figure BDA0001617741390000032
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; rsThe resistance value of an electric energy sending end in the target wireless electric energy transmission system is obtained; vsThe input voltage of an electric energy sending end in a target wireless electric energy transmission system is obtained; pthThe minimum output power is that when N electric energy receiving ends exist in a target wireless electric energy transmission system, each electric energy receiving end in the N electric energy receiving ends can work normally.
In a second aspect, an embodiment of the present invention further provides an apparatus for determining the number of power receiving terminals in a wireless power transmission system, where the apparatus may include:
the first determining unit is used for determining an electric energy sending end and an electric energy receiving end which are adopted in a target wireless electric energy transmission system to be designed;
the second determining unit is used for determining a circuit model corresponding to the target wireless power transmission system based on the power transmitting end and the power receiving end; the circuit model comprises an electric energy sending end and N electric energy receiving ends;
the first calculating unit is used for calculating the coupling coefficient between the electric energy sending end and each electric energy receiving end in the circuit model and calculating the load quality factor of the electric energy sending end and each electric energy receiving end;
the second calculation unit is used for calculating the value of N based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation; the first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value.
Optionally, in an embodiment of the present invention, the apparatus may further include:
the judgment unit is used for judging whether the output power of each electric energy receiving end in the N electric energy receiving ends is smaller than the lowest output power of the corresponding electric energy receiving end or not based on the N value obtained by calculation after the N value is calculated based on the coupling coefficient obtained by calculation, the load quality factor and a preset first receiving end number calculation formula;
and the updating unit is used for updating the calculated N value by utilizing the calculated value of the preset second receiving end number calculation formula when the judging unit judges that the output power of the receiving end is smaller than the lowest output power of the corresponding electric energy receiving end.
Optionally, the first receiving end number calculation formula may be:
Figure BDA0001617741390000041
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; λ is a preset energy transmission efficiency gain coefficient; mu is a preset output power gain coefficient; k is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the target wireless electric energy transmission system; q is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the target wireless electric energy transmission system; qsThe load quality factor of the power transmitting end in the target wireless power transmission system is obtained.
Optionally, the apparatus may further include: an obtaining unit; the obtaining unit includes:
the first calculation submodule is used for calculating the output power of each electric energy receiving end in the preset wireless electric energy transmission system and calculating the energy transmission efficiency of the preset wireless electric energy transmission system; the preset wireless power transmission system comprises X identical power receiving ends;
the second calculation submodule is used for calculating the energy transmission efficiency gain of the preset wireless power transmission system when the X identical power receiving ends exist in the preset wireless power transmission system, compared with the situation that a single power receiving end exists in the preset wireless power transmission system;
the third calculation sub-module is used for calculating the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when the X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, relative to the situation that a single electric energy receiving end exists in the preset wireless electric energy transmission system;
the generation submodule is used for generating an energy transmission efficiency-output power combined gain coefficient calculation formula based on the energy transmission efficiency gain, the output power gain, the energy transmission efficiency gain coefficient and the output power gain coefficient;
the obtaining submodule is used for obtaining an intermediate calculation formula for calculating the maximum value obtained by the X energy based on the energy transmission efficiency-output power combined gain coefficient calculation formula; and the conversion submodule is used for converting to obtain a first receiving end number calculation formula based on the intermediate calculation formula.
Alternatively, the energy transfer efficiency-output power joint gain coefficient calculation formula may be:
Figure BDA0001617741390000051
wherein G is an energy transmission efficiency-output power joint gain coefficient; gηEnergy transfer efficiency gain; gPFor output power gain ηX-loadη, when X identical power receiving ends exist in the preset wireless power transmission system, the energy transmission efficiency of the wireless power transmission system is preset1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the wireless electric energy transmission system is preset; pX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the wireless electric energy transmission system is preset; p1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the wireless electric energy transmission system is preset; k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system; q' is an on-load quality factor determined based on the on-load quality factor of an electric energy receiving end in a preset wireless electric energy transmission system; qs' is the preset load quality factor of the electric energy transmitting end in the wireless electric energy transmission system; v. ofs' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
Optionally, in this embodiment of the present invention, the second receiving end number calculation formula may be:
Figure BDA0001617741390000061
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; rsThe resistance value of an electric energy sending end in the target wireless electric energy transmission system is obtained; vsThe input voltage of an electric energy sending end in a target wireless electric energy transmission system is obtained; pthThe minimum output power is that when N electric energy receiving ends exist in a target wireless electric energy transmission system, each electric energy receiving end in the N electric energy receiving ends can work normally.
In a third aspect, an embodiment of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, where the processor and the communication interface complete communication between the memory and the processor through the communication bus;
a memory for storing a computer program;
a processor for implementing any of the above method steps for determining the number of power receiving terminals in a wireless power transmission system when executing a program stored in the memory.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements any of the method steps of the method for determining the number of power receiving terminals in a wireless power transmission system.
In the embodiment of the invention, the electric energy sending end and the electric energy receiving end which are adopted by the target wireless electric energy transmission system to be designed can be determined firstly. And then, constructing a circuit model which corresponds to the target wireless power transmission system and comprises one power transmitting terminal and N power receiving terminals by using the determined power transmitting terminal and power receiving terminal. And then, calculating the coupling coefficient and the load quality factor of the electric energy transmitting end and each electric energy receiving end in the circuit model. Then, the values of N of the N electric energy receiving ends in the circuit model can be calculated based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation. The first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value. Therefore, the target wireless power transmission system is designed by utilizing the number of the power receiving ends calculated by the first receiving end number calculation formula, so that the energy transmission efficiency of the target wireless power transmission system and the output power of each power receiving end in the system can be balanced, and the power transmission performance of the system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining the number of power receiving terminals in a wireless power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for determining the number of power receiving terminals in a wireless power transmission system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
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 solve the problems in the prior art, embodiments of the present invention provide a method, an apparatus, an electronic device, and a computer-readable storage medium for determining the number of power receiving terminals in a wireless power transmission system.
First, a method for determining the number of power receiving terminals in a wireless power transmission system according to an embodiment of the present invention is described below.
Referring to fig. 1, a method for determining the number of power receiving terminals in a wireless power transmission system according to an embodiment of the present invention may include the following steps:
s101: determining an electric energy sending end and an electric energy receiving end to be adopted in a target wireless electric energy transmission system to be designed;
the electric energy sending end and the electric energy receiving end to be adopted are determined, and parameters such as the number of turns of coils, the inductance value, the compensation capacitance value and the like of the electric energy sending end and the electric energy receiving end to be adopted are also determined.
In addition, the determined electric energy receiving ends can be various types of electric energy receiving ends, and parameters of any two types of electric energy receiving ends are not completely the same. Of course, it is also reasonable to determine only one type of power receiving end.
S102: determining a circuit model corresponding to a target wireless power transmission system based on an electric energy sending end and an electric energy receiving end; the circuit model comprises an electric energy sending end and N electric energy receiving ends;
after the electric energy sending end and the electric energy receiving end to be adopted are determined, a circuit model corresponding to a target wireless electric energy transmission system to be designed can be determined based on the determined electric energy sending end and the determined electric energy receiving end. The circuit model can be set to comprise an electric energy sending end and N electric energy receiving ends, wherein N is more than or equal to 2.
After the circuit model is set, the relative positions of each electric energy receiving end and each electric energy sending end in the circuit model are determined, namely the distance between each electric energy receiving end and each electric energy sending end is determined. Moreover, parameters of the electric energy receiving end and the electric energy sending end in the circuit model are also determined.
S103: calculating the coupling coefficient of the electric energy sending end and each electric energy receiving end in the circuit model, and calculating the load quality factor of the electric energy sending end and each electric energy receiving end;
the coupling coefficient between the electric energy sending end and each electric energy receiving end in the circuit model can be calculated through a coupling coefficient calculation formula.
The coupling coefficient calculation formula is as follows:
Figure BDA0001617741390000081
wherein k issjThe coupling coefficient between coils of an electric energy sending end and a jth electric energy receiving end in a target wireless electric energy transmission system is shown. MsjL is the inductance value between the coils of the power transmitting terminal and the jth power receiving terminal in the target wireless power transmission systemsL inductance value of coil at power transmitting end in target wireless power transmission systemjThe inductance value of the coil of the jth power receiving end in the target wireless power transmission system is obtained.
In addition, when the power transmitting end or the power receiving end is an R L C series resonant circuit, the load quality factor of the corresponding power transmitting end or the power receiving end can be calculated by dividing the inductive reactance or the capacitive reactance at the time of resonance by the series resistance.
S104: calculating the value of N based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained by calculation; the first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value.
After the coupling coefficients of the electric energy transmitting terminal and each electric energy receiving terminal in the circuit model are obtained through calculation, in an implementation mode, the maximum coupling coefficient can be selected from the obtained coupling coefficients to serve as the equivalent coupling coefficient corresponding to the target wireless electric energy transmission system. In another implementation, the calculated coupling coefficients may be summed and the sum averaged. And then, taking the obtained average of the coupling coefficients as the equivalent coupling coefficient corresponding to the target wireless power transmission system.
In yet another implementation manner, the equivalent coupling coefficient may be calculated by using a preset equivalent coupling coefficient calculation formula. The equivalent coupling coefficient calculation formula may be:
Figure BDA0001617741390000091
wherein Q isnAnd representing the loaded quality factor of the Nth electric energy receiving end in the target wireless electric energy transmission system. k is a radical ofsnThe coupling coefficient between coils of an electric energy sending end and an Nth electric energy receiving end in the target wireless electric energy transmission system is obtained.
In addition, after the on-load quality factors of the power transmitting end and each power receiving end in the circuit model are obtained through calculation, in one implementation mode, the largest on-load quality factor can be selected from the on-load quality factors corresponding to the power receiving ends and is used as the on-load quality factor determined and obtained based on the on-load quality factors of the power receiving ends in the target wireless power transmission system. In another implementation, the calculated on-load figure of merit of the power receiving end may be summed, and then the sum may be averaged. And then, taking the obtained average of the coupling coefficients as the load quality factor determined based on the load quality factor of the power receiving end in the target wireless power transmission system.
Then, the equivalent coupling coefficient corresponding to the target wireless power transmission system, the load quality factor determined based on the load quality factor of the power receiving end in the target wireless power transmission system, and the load quality factor of the power transmitting end in the target wireless power transmission system can be substituted into the first receiving end number calculation formula, so that the optimal power receiving end number in the target wireless power transmission system can be calculated.
The first receiving end number calculation formula may be:
Figure BDA0001617741390000101
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; λ is a preset energy transmission efficiency gain coefficient; mu is a preset output power gain coefficient; k is based on the target radioCalculating the coupling coefficient of an electric energy sending end and an electric energy receiving end in the energy transmission system to obtain an equivalent coupling coefficient; q is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the target wireless electric energy transmission system; qsThe load quality factor of the power transmitting end in the target wireless power transmission system is obtained.
Here, λ + μ ═ 1 may be set. In the calculation, λ may be set to 1, and μmay be set to 0, in which case only the energy transfer efficiency gain of the target wireless power transfer system is considered, and the output power gain is not considered. In this case, λ may be 0, and μmay be 1, and only the output power gain of the target wireless power transmission system is considered, and the energy transmission efficiency gain is not considered. When it is desired to balance the energy transfer efficiency gain and the output power gain, i.e., balance the energy transfer efficiency and the output power, it is reasonable to set λ ═ μ ═ 0.5, or the absolute value of the difference between λ and μ is smaller than a small preset threshold.
In the embodiment of the invention, the electric energy sending end and the electric energy receiving end which are adopted by the target wireless electric energy transmission system to be designed can be determined firstly. And then, constructing a circuit model which corresponds to the target wireless power transmission system and comprises one power transmitting terminal and N power receiving terminals by using the determined power transmitting terminal and power receiving terminal. And then, calculating the coupling coefficient and the load quality factor of the electric energy transmitting end and each electric energy receiving end in the circuit model. Then, the values of N of the N electric energy receiving ends in the circuit model can be calculated based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation. The first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value. Therefore, the target wireless power transmission system is designed by utilizing the number of the power receiving ends calculated by the first receiving end number calculation formula, so that the energy transmission efficiency of the target wireless power transmission system and the output power of each power receiving end in the system can be balanced, and the power transmission performance of the system is improved.
After the value of N is obtained through calculation, in order to ensure that when N power receiving terminals are deployed in the target wireless power transmission system, the output power of each power receiving terminal of the N power receiving terminals can ensure that the corresponding power receiving terminal works normally. After the value of N is calculated, the following operations may also be performed:
judging whether the output power of each electric energy receiving end in the N electric energy receiving ends is smaller than the lowest output power of the corresponding electric energy receiving end or not based on the calculated N value;
and if the output power of the receiving end is smaller than the lowest output power of the corresponding electric energy receiving end, updating the calculated value of the preset second receiving end number calculation formula to obtain the N value.
Wherein, the lowest output power of an electric energy receiving end means: the lowest output power of the electric energy receiving end in normal operation can be met.
The second receiving end number calculation formula may be:
Figure BDA0001617741390000111
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; rsThe resistance value of an electric energy sending end in the target wireless electric energy transmission system is obtained; vsThe input voltage of an electric energy sending end in a target wireless electric energy transmission system is obtained; pthThe minimum output power is that when N electric energy receiving ends exist in a target wireless electric energy transmission system, each electric energy receiving end in the N electric energy receiving ends can work normally.
For example, the first receiving end number calculation formula is used to calculate that N is 6, and the output power of each of the 6 receiving ends cannot guarantee the corresponding receiving end to operate normally. At this time, the second receiving end number calculation formula may be used to recalculate to obtain N-4, and replace N-6 with N-4 to update the value of N.
The following describes a manner of obtaining the target calculation formula of the first receiving end.
The step of obtaining the first receiving end number calculation formula may include:
s201: calculating the output power of each electric energy receiving end in a preset wireless electric energy transmission system, and calculating the energy transmission efficiency of the preset wireless electric energy transmission system; the preset wireless power transmission system comprises X identical power receiving ends;
the preset wireless power transmission system comprises a power transmitting terminal and X identical power receiving terminals. That is, the coil turns, inductance, compensation capacitance and other parameters of any two of the X electric energy receiving ends are completely the same, and X is more than or equal to 2.
In addition, a normalized current matrix equation for X power receiving terminals can be established as follows:
Figure BDA0001617741390000121
wherein v iss' finger presetting of normalized input voltage of power transmitting terminal in wireless power transmission system, the
Figure BDA0001617741390000122
Vs' refers to the input voltage of the electric energy transmitting terminal; omega is0Refers to the resonant frequency, Ls' means an inductance value of the coil of the power transmitting terminal. In addition, ijRefers to the normalized current of the jth power receiving terminal, and
Figure BDA0001617741390000123
Ijcurrent of jth power receiving terminal, Ls' means an inductance value of the coil of the jth power receiving terminal.
Then, the energy transmission efficiency of the preset wireless power transmission system can be calculated through an energy transmission efficiency calculation formula and the normalized current matrix equation:
Figure BDA0001617741390000124
since the X electric energy receiving terminals are identical, the output power can be simplified as follows:
Figure BDA0001617741390000125
wherein Q isxThe method is characterized by presetting the loaded quality factor of the Xth electric energy receiving end in the wireless electric energy transmission system. k is a radical ofsxThe method is characterized by presetting a coupling coefficient between coils of an electric energy sending end and an Xth electric energy receiving end in a wireless electric energy transmission system. k is a radical ofeAnd k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system. QeQ' is the sum of the on-load quality factors of the electric energy receiving ends in the preset wireless electric energy transmission system, and the on-load quality factor determined based on the on-load quality factors of the electric energy receiving ends in the preset wireless electric energy transmission system; qs' is the preset load quality factor of the power transmitting end in the wireless power transmission system.
In addition, the output power of each electric energy receiving end can be calculated through an output power calculation formula:
Figure BDA0001617741390000131
wherein, PjThe method comprises the steps that the output power of the jth electric energy receiving end in a wireless electric energy transmission system is preset, and Q' is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the wireless electric energy transmission system; qs' is the preset load quality factor of the electric energy transmitting end in the wireless electric energy transmission system; v. ofs' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
S202: calculating energy transmission efficiency gain of the preset wireless power transmission system when X identical power receiving ends exist in the preset wireless power transmission system, compared with the situation that a single power receiving end exists in the preset wireless power transmission system;
presetting energy transmission efficiency gain G of wireless electric energy transmission systemηComprises the following steps:
Figure BDA0001617741390000132
wherein, ηX-loadη, when X identical power receiving ends exist in the preset wireless power transmission system, the energy transmission efficiency of the wireless power transmission system is preset1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the wireless electric energy transmission system is preset.
S203: calculating the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, compared with the situation that a single electric energy receiving end exists in the preset wireless electric energy transmission system;
presetting output power gain G of electric energy receiving end in wireless electric energy transmission systemPComprises the following steps:
Figure BDA0001617741390000141
wherein, PX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the wireless electric energy transmission system is preset; p1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the wireless electric energy transmission system is preset.
S204: generating an energy transmission efficiency-output power combined gain coefficient calculation formula based on the energy transmission efficiency gain, the output power gain, the energy transmission efficiency gain coefficient and the output power gain coefficient;
the energy transmission efficiency-output power joint gain coefficient calculation formula can be as follows:
Figure BDA0001617741390000142
wherein G is an energy transmission efficiency-output power joint gain coefficient; gηEnergy transfer efficiency gain; gPFor output power gain ηX-loadη, when X identical power receiving ends exist in the preset wireless power transmission system, the energy transmission efficiency of the wireless power transmission system is preset1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the wireless electric energy transmission system is preset; pX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the wireless electric energy transmission system is preset; p1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the wireless electric energy transmission system is preset; k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system; q' is the sum of the loaded quality factors of the electric energy receiving ends in the preset wireless electric energy transmission system; qs' is the preset load quality factor of the electric energy transmitting end in the wireless electric energy transmission system; v. ofs' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
S205: obtaining an intermediate calculation formula for calculating the maximum value obtained by X energy based on an energy transmission efficiency-output power combined gain coefficient calculation formula;
wherein, the obtained intermediate calculation formula can be:
Figure BDA0001617741390000151
s206: and converting to obtain a first receiving end number calculation formula based on the intermediate calculation formula.
The calculation formula of the number of the first receiving ends obtained by the conversion of the intermediate calculation formula is as follows:
Figure BDA0001617741390000152
in summary, by applying the embodiments of the present invention, the energy transmission efficiency of the wireless power transmission system and the output power of each power receiving end in the system can be balanced, thereby improving the power transmission performance of the system.
Corresponding to the foregoing method embodiment, an embodiment of the present invention further provides an apparatus for determining the number of power receiving terminals in a wireless power transmission system, and referring to fig. 2, the apparatus may include:
a first determining unit 201, configured to determine an electric energy sending end and an electric energy receiving end to be used in a target wireless electric energy transmission system to be designed;
a second determining unit 202, configured to determine, based on the electric energy sending end and the electric energy receiving end, a circuit model corresponding to the target wireless electric energy transmission system; the circuit model comprises an electric energy sending end and N electric energy receiving ends;
the first calculating unit 203 is used for calculating the coupling coefficient between the electric energy sending end and each electric energy receiving end in the circuit model and calculating the load quality factor of the electric energy sending end and each electric energy receiving end;
the second calculating unit 204 is configured to calculate a value of N based on the calculated coupling coefficient, the load quality factor, and a preset first receiving end number calculation formula; the first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient; the absolute value of the difference between the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value.
By applying the device provided by the embodiment of the invention, the electric energy sending end and the electric energy receiving end which are adopted by the target wireless electric energy transmission system to be designed can be determined firstly. And then, constructing a circuit model which corresponds to the target wireless power transmission system and comprises one power transmitting terminal and N power receiving terminals by using the determined power transmitting terminal and power receiving terminal. And then, calculating the coupling coefficient and the load quality factor of the electric energy transmitting end and each electric energy receiving end in the circuit model. Then, the values of N of the N electric energy receiving ends in the circuit model can be calculated based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation. The first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value. Therefore, the target wireless power transmission system is designed by utilizing the number of the power receiving ends calculated by the first receiving end number calculation formula, so that the energy transmission efficiency of the target wireless power transmission system and the output power of each power receiving end in the system can be balanced, and the power transmission performance of the system is improved.
Optionally, in an embodiment of the present invention, the apparatus may further include:
the judgment unit is used for judging whether the output power of each electric energy receiving end in the N electric energy receiving ends is smaller than the lowest output power of the corresponding electric energy receiving end or not based on the N value obtained by calculation after the N value is calculated based on the coupling coefficient obtained by calculation, the load quality factor and a preset first receiving end number calculation formula;
and the updating unit is used for updating the calculated N value by utilizing the calculated value of the preset second receiving end number calculation formula when the judging unit judges that the output power of the receiving end is smaller than the lowest output power of the corresponding electric energy receiving end.
Optionally, the first receiving end number calculation formula may be:
Figure BDA0001617741390000161
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; λ is a preset energy transmission efficiency gain coefficient; mu is a preset output power gain coefficient; k is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the target wireless electric energy transmission system; q is the on-load quality determined based on the on-load quality factor of the power receiving end in the target wireless power transmission systemA factor; qsThe load quality factor of the power transmitting end in the target wireless power transmission system is obtained.
Optionally, in an embodiment of the present invention, the apparatus may further include: an obtaining unit;
the obtaining unit includes: the device comprises a first calculation submodule, a second calculation submodule, a third calculation submodule, a generation submodule, an obtaining submodule and a conversion submodule;
the first calculation submodule is used for calculating the output power of each electric energy receiving end in the preset wireless electric energy transmission system and calculating the energy transmission efficiency of the preset wireless electric energy transmission system; the preset wireless power transmission system comprises X identical power receiving ends;
the second calculation submodule is used for calculating the energy transmission efficiency gain of the preset wireless power transmission system when the X identical power receiving ends exist in the preset wireless power transmission system, compared with the situation that a single power receiving end exists in the preset wireless power transmission system;
the third calculation sub-module is used for calculating the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when the X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, relative to the situation that a single electric energy receiving end exists in the preset wireless electric energy transmission system;
the generation submodule is used for generating an energy transmission efficiency-output power combined gain coefficient calculation formula based on the energy transmission efficiency gain, the output power gain, the energy transmission efficiency gain coefficient and the output power gain coefficient;
the obtaining submodule is used for obtaining an intermediate calculation formula for calculating the maximum value obtained by the X energy based on the energy transmission efficiency-output power combined gain coefficient calculation formula;
and the conversion submodule is used for converting to obtain a first receiving end number calculation formula based on the intermediate calculation formula.
Alternatively, the energy transfer efficiency-output power joint gain coefficient calculation formula may be:
Figure BDA0001617741390000171
wherein G is an energy transmission efficiency-output power joint gain coefficient; gηEnergy transfer efficiency gain; gPFor output power gain ηX-loadη, when X identical power receiving ends exist in the preset wireless power transmission system, the energy transmission efficiency of the wireless power transmission system is preset1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the wireless electric energy transmission system is preset; pX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the wireless electric energy transmission system is preset; p1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the wireless electric energy transmission system is preset; k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system; q' is an on-load quality factor determined based on the on-load quality factor of an electric energy receiving end in a preset wireless electric energy transmission system; qs' is the preset load quality factor of the electric energy transmitting end in the wireless electric energy transmission system; v. ofs' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
Optionally, in this embodiment of the present invention, the second receiving end number calculation formula may be:
Figure BDA0001617741390000181
wherein N is the number of electric energy receiving ends in the target wireless electric energy transmission system; rsThe resistance value of an electric energy sending end in the target wireless electric energy transmission system is obtained; vsThe input voltage of an electric energy sending end in a target wireless electric energy transmission system is obtained; pthThe minimum output power is that when N electric energy receiving ends exist in a target wireless electric energy transmission system, each electric energy receiving end in the N electric energy receiving ends can work normally.
Corresponding to the above method embodiment, an embodiment of the present invention provides an electronic device, referring to fig. 3, the electronic device includes a processor 301, a communication interface 302, a memory 303, and a communication bus 304, where the processor 301, the communication interface 302, and the memory 303 complete communication with each other through the communication bus 304;
a memory 303 for storing a computer program;
the processor 301, when executing the program stored in the memory 303, is configured to implement any of the above method steps of the method for determining the number of power receiving terminals in the wireless power transmission system.
In the embodiment of the invention, the electronic device may determine the electric energy transmitting terminal and the electric energy receiving terminal to be adopted by the target wireless electric energy transmission system to be designed. And then, constructing a circuit model which corresponds to the target wireless power transmission system and comprises one power transmitting terminal and N power receiving terminals by using the determined power transmitting terminal and power receiving terminal. And then, calculating the coupling coefficient and the load quality factor of the electric energy transmitting end and each electric energy receiving end in the circuit model. Then, the values of N of the N electric energy receiving ends in the circuit model can be calculated based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation. The first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value. Therefore, the target wireless power transmission system is designed by utilizing the number of the power receiving ends calculated by the first receiving end number calculation formula, so that the energy transmission efficiency of the target wireless power transmission system and the output power of each power receiving end in the system can be balanced, and the power transmission performance of the system is improved.
Corresponding to the above method embodiment, an embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when being executed by a processor, implements any of the method steps of the method for determining the number of power receiving ends in a wireless power transmission system.
After the computer program stored in the computer-readable storage medium provided by the embodiment of the present invention is executed by a processor of the electronic device, the electronic device may determine an electric energy transmitting end and an electric energy receiving end to be used by a target wireless electric energy transmission system to be designed. And then, constructing a circuit model which corresponds to the target wireless power transmission system and comprises one power transmitting terminal and N power receiving terminals by using the determined power transmitting terminal and power receiving terminal. And then, calculating the coupling coefficient and the load quality factor of the electric energy transmitting end and each electric energy receiving end in the circuit model. Then, the values of N of the N electric energy receiving ends in the circuit model can be calculated based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation. The first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value. Therefore, the target wireless power transmission system is designed by utilizing the number of the power receiving ends calculated by the first receiving end number calculation formula, so that the energy transmission efficiency of the target wireless power transmission system and the output power of each power receiving end in the system can be balanced, and the power transmission performance of the system is improved.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the embodiments of the apparatus, the electronic device, and the computer-readable storage medium, since they are substantially similar to the embodiments of the method, the description is simple, and for the relevant points, reference may be made to the partial description of the embodiments of the method.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (6)

1. A method for determining the number of power receivers in a wireless power transfer system, comprising:
determining an electric energy sending end and an electric energy receiving end to be adopted in a target wireless electric energy transmission system to be designed;
determining a circuit model corresponding to the target wireless power transmission system based on the power transmitting terminal and the power receiving terminal; the circuit model comprises an electric energy sending end and N electric energy receiving ends;
calculating the coupling coefficient of the electric energy sending end and each electric energy receiving end in the circuit model, and calculating the load quality factor of the electric energy sending end and each electric energy receiving end;
calculating the value of N based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained by calculation; the first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value;
the first receiving end number calculation formula is as follows:
Figure FDA0002501741090000011
wherein N is the number of power receiving ends in the target wireless power transmission system; the lambda is a preset energy transmission efficiency gain coefficient; mu is a preset output power gain coefficient; the k is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the target wireless electric energy transmission system; q is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the target wireless electric energy transmission system; said QsWireless power transfer to the targetThe load quality factor of an electric energy transmitting end in the transmission system;
wherein the step of obtaining the first receiving end number calculation formula comprises: calculating the output power of each electric energy receiving end in a preset wireless electric energy transmission system, and calculating the energy transmission efficiency of the preset wireless electric energy transmission system; the preset wireless power transmission system comprises X identical power receiving ends;
calculating energy transmission efficiency gain of the preset wireless power transmission system when X identical power receiving ends exist in the preset wireless power transmission system, compared with when a single power receiving end exists in the preset wireless power transmission system;
calculating the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, compared with the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when a single electric energy receiving end exists in the preset wireless electric energy transmission system;
generating an energy transmission efficiency-output power joint gain coefficient calculation formula based on the energy transmission efficiency gain, the output power gain, the energy transmission efficiency gain coefficient and the output power gain coefficient;
obtaining an intermediate calculation formula for calculating the maximum value of the X energy based on the energy transmission efficiency-output power joint gain coefficient calculation formula; based on the intermediate calculation formula, converting to obtain a first receiving end number calculation formula;
wherein, the calculation formula of the energy transmission efficiency-output power joint gain coefficient is as follows:
Figure FDA0002501741090000021
wherein G is an energy transmission efficiency-output power joint gain coefficient; the G isηA gain in the energy transfer efficiency; the G isPFor the output power gain, said ηX-loadWhen X identical power connections exist in the preset wireless power transmission systemWhen receiving the terminal, the preset energy transmission efficiency of the wireless electric energy transmission system is η1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the preset wireless electric energy transmission system is improved; the P isX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the preset wireless electric energy transmission system is output; the P is1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the preset wireless electric energy transmission system is output; the k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system; q' is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the preset wireless electric energy transmission system; said Qs' is the loaded quality factor of the electric energy transmitting end in the preset wireless electric energy transmission system; v iss' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
2. The method of claim 1, wherein after the step of calculating the value of N based on the calculated coupling coefficient, the load quality factor, and a preset first receiver number calculation formula, the method further comprises:
judging whether the output power of each electric energy receiving end in the N electric energy receiving ends is smaller than the lowest output power of the corresponding electric energy receiving end or not based on the calculated N value;
if the output power of the receiving end is smaller than the lowest output power of the corresponding electric energy receiving end, updating the calculated N value by using the calculated value of a preset second receiving end number calculation formula;
wherein, the second receiving end number calculation formula is:
Figure FDA0002501741090000031
wherein N is the number of power receiving ends in the target wireless power transmission system; the R issThe resistance value of an electric energy sending end in the target wireless electric energy transmission system is obtained; the V issThe input voltage of an electric energy sending end in the target wireless electric energy transmission system is obtained; the P isthThe minimum output power is the minimum output power which enables each electric energy receiving end in the N electric energy receiving ends to work normally when the N electric energy receiving ends exist in the target wireless electric energy transmission system.
3. An apparatus for determining the number of power receivers in a wireless power transfer system, comprising:
the first determining unit is used for determining an electric energy sending end and an electric energy receiving end which are adopted in a target wireless electric energy transmission system to be designed;
a second determining unit, configured to determine, based on the electric energy sending end and the electric energy receiving end, a circuit model corresponding to the target wireless electric energy transmission system; the circuit model comprises an electric energy sending end and N electric energy receiving ends;
the first calculating unit is used for calculating the coupling coefficient between the electric energy sending end and each electric energy receiving end in the circuit model and calculating the load quality factor of the electric energy sending end and each electric energy receiving end;
the second calculation unit is used for calculating the value of the N based on the coupling coefficient, the load quality factor and a preset first receiving end number calculation formula obtained through calculation; the first receiving end number calculation formula is determined based on a preset energy transmission efficiency gain coefficient and an output power gain coefficient, and the absolute value of the difference value of the energy transmission efficiency gain coefficient and the output power gain coefficient is smaller than a preset threshold value;
the first receiving end number calculation formula is as follows:
Figure FDA0002501741090000041
wherein N is the number of power receiving ends in the target wireless power transmission system; the lambda is a preset energy transmission efficiency gain coefficient; mu is a preset output power gain coefficient; the k is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the target wireless electric energy transmission system; q is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the target wireless electric energy transmission system; said QsThe load quality factor of the electric energy transmitting end in the target wireless electric energy transmission system is obtained;
wherein the step of obtaining the first receiving end number calculation formula comprises: calculating the output power of each electric energy receiving end in a preset wireless electric energy transmission system, and calculating the energy transmission efficiency of the preset wireless electric energy transmission system; the preset wireless power transmission system comprises X identical power receiving ends;
calculating energy transmission efficiency gain of the preset wireless power transmission system when X identical power receiving ends exist in the preset wireless power transmission system, compared with when a single power receiving end exists in the preset wireless power transmission system;
calculating the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, compared with the output power gain of the electric energy receiving end in the preset wireless electric energy transmission system when a single electric energy receiving end exists in the preset wireless electric energy transmission system;
generating an energy transmission efficiency-output power joint gain coefficient calculation formula based on the energy transmission efficiency gain, the output power gain, the energy transmission efficiency gain coefficient and the output power gain coefficient;
obtaining an intermediate calculation formula for calculating the maximum value of the X energy based on the energy transmission efficiency-output power joint gain coefficient calculation formula; based on the intermediate calculation formula, converting to obtain a first receiving end number calculation formula;
wherein, the calculation formula of the energy transmission efficiency-output power joint gain coefficient is as follows:
Figure FDA0002501741090000051
wherein G is an energy transmission efficiency-output power joint gain coefficient; the G isηA gain in the energy transfer efficiency; the G isPFor the output power gain, said ηX-loadη, wherein the preset wireless power transmission system has energy transmission efficiency when X identical power receiving terminals exist in the preset wireless power transmission system1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the energy transmission efficiency of the preset wireless electric energy transmission system is improved; the P isX-loadWhen X identical electric energy receiving ends exist in the preset wireless electric energy transmission system, the output power of the X-th electric energy receiving end in the preset wireless electric energy transmission system is output; the P is1-loadWhen a single electric energy receiving end exists in the preset wireless electric energy transmission system, the output power of the electric energy receiving end in the preset wireless electric energy transmission system is output; the k' is an equivalent coupling coefficient obtained by calculation based on the coupling coefficient of the electric energy sending end and the electric energy receiving end in the preset wireless electric energy transmission system; q' is an on-load quality factor determined based on the on-load quality factor of the electric energy receiving end in the preset wireless electric energy transmission system; said Qs' is the loaded quality factor of the electric energy transmitting end in the preset wireless electric energy transmission system; v iss' is the normalized input voltage of the electric energy sending end in the preset wireless electric energy transmission system.
4. The apparatus of claim 3, further comprising:
the judgment unit is used for judging whether the output power of each electric energy receiving end in the N electric energy receiving ends is smaller than the lowest output power of the corresponding electric energy receiving end or not based on the N value obtained by calculation after the value of the N is calculated based on the coupling coefficient obtained by calculation, the load quality factor and a preset first receiving end number calculation formula;
the updating unit is used for updating the calculated N value by utilizing a calculated value of a preset second receiving end number calculation formula when the judging unit judges that the output power of the receiving end is smaller than the lowest output power of the corresponding electric energy receiving end;
wherein, the second receiving end number calculation formula is:
Figure FDA0002501741090000061
wherein N is the number of power receiving ends in the target wireless power transmission system; the R issThe resistance value of an electric energy sending end in the target wireless electric energy transmission system is obtained; the V issThe input voltage of an electric energy sending end in the target wireless electric energy transmission system is obtained; the P isthThe minimum output power is the minimum output power which enables each electric energy receiving end in the N electric energy receiving ends to work normally when the N electric energy receiving ends exist in the target wireless electric energy transmission system.
5. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any one of claims 1 and 2 when executing a program stored in the memory.
6. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method steps of one of the claims 1, 2.
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