CN109687604B - One-to-many wireless power transmission system suitable for ordered loads and control method thereof - Google Patents
One-to-many wireless power transmission system suitable for ordered loads and control method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a one-to-many wireless power transmission system suitable for ordered loads and a control method thereof, belonging to the technical field of wireless power transmission, and comprising a direct current voltage source, a direct current voltage converter and a high-frequency inverter which are sequentially connected with the direct current voltage source, wherein one end of an alternating current output end of the high-frequency inverter is connected with a plurality of switches in parallel, the plurality of switches are connected with a plurality of transmitting coils in series, the other end of the alternating current output end of the high-frequency inverter is connected with an LCL compensation network, the other end of a second resonance inductor of the LCL compensation network is connected with a plurality of transmitting coils, the plurality of transmitting coils are connected with a plurality of receiving coils through electromagnetic coupling, and the plurality of receiving coils are connected with a plurality. The invention solves the problems of complex structure, high cost and low system efficiency of the existing multi-load wireless power transmission system.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and relates to a one-to-many wireless power transmission system suitable for ordered loads and a control method thereof.
Background
The current wireless electric energy transmission system can be divided into four systems, namely one-to-one, one-to-many, many-to-one and many-to-many, wherein the one-to-one wireless electric energy transmission system comprises an inverter, a transmitting coil and a receiving end; two types of one-to-many wireless power transmission systems exist, one type of the system comprises an inverter, a round or rectangular large transmitting coil and a plurality of small receiving coils, and the other type of the system comprises an inverter, a plurality of transmitting coils and a plurality of small receiving coils, so that the problems that the transmission efficiency is low, the electromagnetic radiation is serious, and the receiving voltage of a receiving end is uncontrollable exist.
Moreover, each transmitting coil in the existing wireless power transmission system is independently provided with a set of compensation circuit, so that the system is complex in structure and high in cost, most systems can only realize a topological function, and the efficiency optimization of the system cannot be realized.
Therefore, the present invention is directed to the above problems, and provides a one-to-many wireless power transmission system suitable for an ordered load and a control method thereof.
Disclosure of Invention
The invention aims to: the one-to-many wireless power transmission system suitable for the ordered loads and the control method thereof are provided, and the problems of complex structure, high cost and low system efficiency of the conventional multi-load wireless power transmission system are solved.
The technical scheme adopted by the invention is as follows:
the one-to-many wireless electric energy transmission system suitable for the ordered load comprises a direct current voltage source E and a direct current voltage converter V sequentially connected with the direct current voltage source EDCBAnd a high frequency inverter VTSaid high frequency inverter VTOne end of the AC output end is connected with a plurality of switches S in parallelnN is more than or equal to 1, and the switches SnA plurality of transmitting coils are connected in series, and the high-frequency inverter VTThe other end of the alternating current output end is connected with an LCL compensation network, and a second resonant inductor L of the LCL compensation networkPT2Connected with a plurality of transmitting coils, the transmitting coils are connected with a plurality of receiving coils through electromagnetic coupling, and the receiving coils are connected with a plurality of loads RLnConnecting, wherein n is more than or equal to 1.
Further, the LCL compensation network comprises two first resonant inductors L connected in seriesPT1And a second resonant inductor LPT2And the first resonant inductor LPT1And a second resonant inductor LPT2A resonant capacitor C connected in parallelPTSaid resonant capacitor CPTAnd an inverter VTIs connected at one end.
Further, the receiving coil and the load RLA high-frequency rectifier V is also connected between the twoRTAnd a DC voltage converter VDC。
Further, the one transmitting coilComprising a transmitting coil inductor L connected in seriesPnWhere n is greater than or equal to 1, and a transmitting coil compensation capacitor CPnWherein n is more than or equal to 1.
Further, the one receiving coil includes one receiving coil inductance L connected in seriesSnWhere n is greater than or equal to 1, and a receiving coil compensation capacitor CSnN is more than or equal to 1, and the inductance L of the receiving coilSnAnd a transmitting coil inductance LPnAnd (5) mutual inductance.
The control method of the one-to-many wireless power transmission system suitable for the ordered load comprises a switch control method and an efficiency optimization control method;
the switch control method has the precondition that at least one switch is ensured to be in a closed state, only one switch of the system is closed in a steady state, and two switches are simultaneously closed in a switch switching process in a transient state, and specifically comprises the following steps:
step 1.1: ensuring that at least one switch is in a closed state, assuming an initial state, switch SnIn a closed state;
step 1.2: judging whether the load is increased or decreased;
step 1.3: if step 1.2 has no load increase or decrease, the switch S remains closednWhen the system is in a stable state, the switch switching is finished;
step 1.4: if step 1.2 there is an increase in load, switch S is closedn+1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
step 1.5: if step 1.2 there is a reduction in load, switch S is closedn-1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
the efficiency optimization control method specifically comprises the following steps:
step 2.1: sequentially increasing the load R in the order of the 1 st to the nth transmitting coilsL1、RL2、……、RLnDetermining the number of actual loads, namely the value of n;
step 2.2: transmitting coil inductance L in measuring systemP1、LP2、……、LPnAnd a compensation capacitor C of the transmitting coilP1、CP2、……、CPnVoltage U acrossRP1、URP2、……、URPnD and D.C. voltage converter VDCBOutput voltage U ofDC；
Step 2.3: calculating high frequency inverter VTOutput voltage U ofPT；
Step 2.4: calculating the load RL1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqn；
Step 2.5: calculating DC voltage converter V for maximizing system efficiency by digital analysis methodDCBInduced voltage U ofDCopt；
Step 2.6: providing a DC voltage converter VDCBHas an output voltage of UDCoptThereby optimizing the efficiency of the wireless power transmission system to a maximum value.
Further, in the step 2.3, the high frequency inverter V is calculated according to the formula (1)TOutput voltage U ofPTThe formula (1) is:
further, in step 2.4, the load R is calculated according to equation (2)L1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqnThe formula (2) is:
wherein, PLeqiIs a load RLiAbsorbed active power, Re [ ]]To take the real part of the complex number, UPRiFor emitter voltage, expression is UPRi＝UPi+IPiRPi，UPiIs LPiAnd CPiSum of voltages over, IPiIs passing through LPiCurrent of (M)iFor the ith transmitting coil inductance LPiAnd the ith receiving coil inductance LSiMutual inductance value of, Mi＝M，RPiIs the internal resistance of the i-th transmitting coil, RPi＝RP，RSiIs the internal resistance of the i-th receiving coil, RSi＝RSAnd ω is the system resonance angular frequency:
wherein, CPiCompensating the capacitance for the ith transmitter coil, CSiThe capacitance is compensated for the ith receive coil.
Further, in step 2.5, formula (4) is calculated by a numerical analysis method:
wherein,
where α is a gain coefficient, and the dc voltage converter V that maximizes the system efficiency can be obtained from the above equations (4) and (5)DCBInduced voltage U ofDCopt。
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the wireless power transmission system is suitable for a one-to-many wireless power transmission system with ordered loads, and a plurality of transmitting coils share one LCL compensation network and a high-frequency power supply, so that the topological structure of the system is simplified, and the cost is reduced; when closed-loop control is performed, communication connection does not need to be established between the transmitting coil and the receiving coil, wireless communication equipment is saved, and cost is further reduced.
2. The working state of each transmitting coil is controlled by an independent switch, the working state of the transmitting coil can be controlled by controlling the state of the switch, the transmitting coil which does not work stops working, the control is simple, and the coupling mechanism is one-to-one from the perspective of the electromagnetic coupling mechanism, so that the leakage inductance is reduced, and the electromagnetic radiation of the system is comprehensively reduced.
3. The control method is suitable for the one-to-many wireless power transmission system with the ordered load, realizes switch control and efficiency optimization by combining system modeling and a control algorithm, and improves the transmission efficiency of the wireless power transmission system.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:
fig. 1 is a circuit topology diagram of a one-to-many wireless power transfer system suitable for ordered loads;
fig. 2 is a flowchart of a switch control method in a control method of a one-to-many wireless power transmission system for an orderly load;
fig. 3 is a circuit topology diagram of an efficiency optimization control method among control methods of a one-to-many wireless power transmission system suitable for an ordered load.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that 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.
The one-to-many wireless power transmission system suitable for the ordered loads and the control method thereof solve the problems of complex structure, high cost and low system efficiency of the conventional multi-load wireless power transmission system.
The one-to-many wireless electric energy transmission system suitable for the ordered load comprises a direct current voltage source E and a direct current voltage converter V sequentially connected with the direct current voltage source EDCBAnd a high frequency inverter VTSaid high frequency inverter VTOne end of the AC output end is connected with a plurality of switches S in parallelnN is more than or equal to 1, and the switches SnA plurality of transmitting coils are connected in series, and the high-frequency inverter VTThe other end of the alternating current output end is connected with an LCL compensation network, and a second resonant inductor L of the LCL compensation networkPT2Connected with a plurality of transmitting coils, and the transmitting coils are connected with a plurality of receiving coils through electromagnetic couplingThe receiving coils and the loads RLnConnecting, wherein n is more than or equal to 1.
According to the invention, a plurality of transmitting coils share one LCL compensation network and one high-frequency power supply, so that the topological structure of the system is simplified, and the cost is reduced; when closed-loop control is performed, communication connection does not need to be established between the transmitting coil and the receiving coil, wireless communication equipment is saved, and cost is further reduced.
The control method of the one-to-many wireless power transmission system suitable for the ordered load comprises a switch control method and an efficiency optimization control method;
the switch control method has the precondition that at least one switch is ensured to be in a closed state, only one switch of the system is closed in a steady state, and two switches are simultaneously closed in a switch switching process in a transient state, and specifically comprises the following steps:
step 1.1: ensuring that at least one switch is in a closed state, assuming an initial state, switch SnIn a closed state;
step 1.2: judging whether the load is increased or decreased;
step 1.3: if step 1.2 has no load increase or decrease, the switch S remains closednWhen the system is in a stable state, the switch switching is finished;
step 1.4: if step 1.2 there is an increase in load, switch S is closedn+1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
step 1.5: if step 1.2 there is a reduction in load, switch S is closedn-1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
the efficiency optimization control method specifically comprises the following steps:
step 2.1: sequentially increasing the load R in the order of the 1 st to the nth transmitting coilsL1、RL2、……、RLnDetermining the number of actual loads, namely the value of n;
step 2.2: in the measuring systemTransmitting coil inductance LP1、LP2、……、LPnAnd a compensation capacitor C of the transmitting coilP1、CP2、……、CPnVoltage U acrossRP1、URP2、……、URPnD and D.C. voltage converter VDCBOutput voltage U ofDC；
Step 2.3: calculating high frequency inverter VTOutput voltage U ofPT；
Step 2.4: calculating the load RL1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqn；
Step 2.5: calculating DC voltage converter V for maximizing system efficiency by digital analysis methodDCBInduced voltage U ofDCopt；
Step 2.6: providing a DC voltage converter VDCBHas an output voltage of UDCoptThereby optimizing the efficiency of the wireless power transmission system to a maximum value.
The control method is suitable for the one-to-many wireless power transmission system with the ordered load, realizes switch control and efficiency optimization by combining system modeling and a control algorithm, and improves the transmission efficiency of the wireless power transmission system.
The features and properties of the present invention are described in further detail below with reference to examples.
Example one
As shown in fig. 1, it should be noted that N in the drawing indicates the maximum number of loads in the system, that is, the number of final transmitting ends/receiving ends, N in the specification indicates the number of loads existing in the system in a certain operating state, that is, a certain transmitting end/receiving end therein, and not specifically, N is greater than 1 and less than N, and i in the specification also indicates a general meaning.
The one-to-many wireless electric energy transmission system suitable for the ordered load comprises a direct current voltage source E and a direct current voltage converter V sequentially connected with the direct current voltage source EDCBAnd a high frequency inverter VTSaid high frequency inverter VTOne end of the AC output end is connected with a plurality of switches S in parallelnN is more than or equal to 1, and the switches SnA plurality of transmitting coils are connected in series, and the high-frequency inverter VTThe other end of the alternating current output end is connected with an LCL compensation network, and a second resonant inductor L of the LCL compensation networkPT2Connected with a plurality of transmitting coils, the transmitting coils are connected with a plurality of receiving coils through electromagnetic coupling, and the receiving coils are connected with a plurality of loads RLnConnecting, wherein n is more than or equal to 1.
Further, the LCL compensation network comprises two first resonant inductors L connected in seriesPT1And a second resonant inductor LPT2And the first resonant inductor LPT1And a second resonant inductor LPT2A resonant capacitor C connected in parallelPTSaid resonant capacitor CPTAnd an inverter VTIs connected at one end.
Further, the receiving coil and the load RLA high-frequency rectifier V is also connected between the twoRTAnd a DC voltage converter VDC。
Further, the one transmitting coil includes one transmitting coil inductor L connected in seriesPnWhere n is greater than or equal to 1, and a transmitting coil compensation capacitor CPnWherein n is more than or equal to 1.
Further, the one receiving coil includes one receiving coil inductance L connected in seriesSnWhere n is greater than or equal to 1, and a receiving coil compensation capacitor CSnN is more than or equal to 1, and the inductance L of the receiving coilSnAnd a transmitting coil inductance LPnAnd (5) mutual inductance.
The working principle is as follows:
the DC voltage converter VDCBThe output voltage U of the DC voltage source EDCBIs transformed into UDCThen output to the high frequency inverter VTSaid high frequency inverter VTWill UDCConverting into high-frequency AC voltage source, and supplying power to LCL compensation network when current I of high-frequency AC currentPTCurrent through transmitting coil inductance LPnAt the transmitting coil inductance LPnGenerating a high-frequency electromagnetic field around; inductance L of receiving coilSnUnder the action of the high-frequency electromagnetic field, high-frequency AC voltage is induced and passes through a high-frequency rectifier VRTRectified and then passed through a DC voltage converter VDCChange, i.e. for the load RLnAnd (5) supplying power.
According to the invention, a plurality of transmitting coils share one LCL compensation network and one high-frequency power supply, so that the topological structure of the system is simplified, and the cost is reduced; during closed-loop control, communication connection does not need to be established between the transmitting coil and the receiving coil, wireless communication equipment is saved, and cost is further reduced.
The control method of the one-to-many wireless power transmission system suitable for the ordered load comprises a switch control method and an efficiency optimization control method;
the precondition of the switch control method is to ensure that at least one switch is in a closed state, only one switch of the system is closed in a steady state, and two switches are simultaneously closed in a switch switching process in a transient state, as shown in fig. 2, the method specifically comprises the following steps:
step 1.1: ensuring that at least one switch is in a closed state, assuming an initial state, switch SnIn a closed state;
step 1.2: judging whether the load is increased or decreased;
step 1.3: if step 1.2 has no load increase or decrease, the switch S remains closednWhen the system is in a stable state, the switch switching is finished;
step 1.4: if step 1.2 there is an increase in load, switch S is closedn+1The system is in a transient state, and then the switch S is turned offnSwitch, switchFinishing the switching;
step 1.5: if step 1.2 there is a reduction in load, switch S is closedn-1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
the efficiency optimization control method, as shown in fig. 3, is a circuit topology during efficiency optimization, and specifically includes the following steps:
step 2.1: sequentially increasing the load R in the order of the 1 st to the nth transmitting coilsL1、RL2、……、RLnDetermining the number of actual loads, namely the value of n;
step 2.2: transmitting coil inductance L in measuring systemP1、LP2、……、LPnAnd a compensation capacitor C of the transmitting coilP1、CP2、……、CPnVoltage U acrossRP1、URP2、……、URPnD and D.C. voltage converter VDCBOutput voltage U ofDC；
Step 2.3: calculating high frequency inverter VTOutput voltage U ofPT；
Step 2.4: calculating the load RL1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqn；
Step 2.5: calculating DC voltage converter V for maximizing system efficiency by digital analysis methodDCBInduced voltage U ofDCopt；
Step 2.6: providing a DC voltage converter VDCBHas an output voltage of UDCoptThereby optimizing the efficiency of the wireless power transmission system to a maximum value.
Further, in the step 2.3, the high frequency inverter V is calculated according to the formula (1)TOutput voltage U ofPTThe formula (1) is:
further, in the step 2.4Calculating the load R according to the formula (2)L1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqnThe formula (2) is:
wherein, PLeqiIs a load RLiAbsorbed active power, Re [ ]]To take the real part of the complex number, UPRiFor emitter voltage, expression is UPRi＝UPi+IPiRPi，UPiIs LPiAnd CPiSum of voltages over, IPiIs passing through LPiCurrent of (M)iFor the ith transmitting coil inductance LPiAnd the ith receiving coil inductance LSiMutual inductance value of, Mi＝M，RPiIs the internal resistance of the i-th transmitting coil, RPi＝RP，RSiIs the internal resistance of the i-th receiving coil, RSi＝RSAnd ω is the system resonance angular frequency:
wherein, CPiCompensating the capacitance for the ith transmitter coil, CSiThe capacitance is compensated for the ith receive coil.
Further, in step 2.5, formula (4) is calculated by a numerical analysis method:
wherein,
wherein α is a gain coefficient, which can be obtained from the above equations (4) and (5)DC voltage converter V for maximizing system efficiencyDCBInduced voltage U ofDCopt。
The control method is suitable for the one-to-many wireless power transmission system with the ordered load, realizes switch control and efficiency optimization by combining system modeling and a control algorithm, and improves the transmission efficiency of the wireless power transmission system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents and improvements made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (1)
1. A control method of a one-to-many wireless power transmission system suitable for an ordered load is characterized by comprising the one-to-many wireless power transmission system suitable for the ordered load, a switch control method and an efficiency optimization control method;
the one-to-many wireless power transmission system suitable for the ordered load comprises a direct-current voltage source E, and is characterized in that: further comprises a DC voltage converter V connected with the DC voltage source E in sequenceDCBAnd a high frequency inverter VTSaid high frequency inverter VTOne end of the AC output end is connected with a plurality of switches S in parallelnN is more than or equal to 1, and the switches SnA plurality of transmitting coils are connected in series, and the high-frequency inverter VTThe other end of the alternating current output end is connected with an LCL compensation network, and a second resonant inductor L of the LCL compensation networkPT2The other end of the magnetic field sensor is connected with a plurality of transmitting coils, the transmitting coils are connected with a plurality of receiving coils through electromagnetic coupling, and the receiving coils are connected with a plurality of loads RLnConnecting, wherein n is more than or equal to 1;
a transmitter coil comprising a transmitter coil inductor L connected in seriesPnWhere n is greater than or equal to 1, and a transmitting coil compensation capacitor CPnWherein n is more than or equal to 1;
a receiving coil including a receiving coil inductor L connected in seriesSnWhereinN is not less than 1, and a receiving coil compensation capacitor CSnN is more than or equal to 1, and the inductance L of the receiving coilSnAnd a transmitting coil inductance LPnMutual inductance;
the switch control method has the precondition that at least one switch is ensured to be in a closed state, only one switch of the system is closed in a steady state, and two switches are simultaneously closed in a switch switching process in a transient state, and specifically comprises the following steps:
step 1.1: ensuring that at least one switch is in a closed state, assuming an initial state, switch SnIn a closed state;
step 1.2: judging whether the load is increased or decreased;
step 1.3: if step 1.2 has no load increase or decrease, the switch S remains closednWhen the system is in a stable state, the switch switching is finished;
step 1.4: if step 1.2 there is an increase in load, switch S is closedn+1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
step 1.5: if step 1.2 there is a reduction in load, switch S is closedn-1The system is in a transient state, and then the switch S is turned offnThe switch is switched over;
the efficiency optimization control method specifically comprises the following steps:
step 2.1: sequentially increasing the load R in the order of the 1 st to the nth transmitting coilsL1、RL2、……、RLnDetermining the number of actual loads, namely the value of n;
step 2.2: transmitting coil inductance L in measuring systemP1、LP2、……、LPnAnd a compensation capacitor C of the transmitting coilP1、CP2、……、CPnVoltage U acrossRP1、URP2、……、URPnD and D.C. voltage converter VDCBOutput voltage U ofDC；
Step 2.3: calculating the output voltage U of a high frequency inverter VTPT；
Step 2.4: calculating the load RL1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqn；
Step 2.5: calculating DC voltage converter V for maximizing system efficiency by digital analysis methodDCBInduced voltage U ofDCopt；
Step 2.6: providing a DC voltage converter VDCBHas an output voltage of UDCoptThereby optimizing the efficiency of the wireless power transmission system to a maximum value;
in the step 2.3, the high-frequency inverter V is calculated according to the formula (1)TOutput voltage U ofPTThe formula (1) is:
in said step 2.4, the load R is calculated according to the formula (2)L1、RL2、……、RLnAbsorbed active power PLeq1、PLeq2、……、PLeqnThe formula (2) is:
wherein, PLeqiIs a load RLiAbsorbed active power, Re [ ]]To take the real part of the complex number, UPRiFor emitter voltage, expression is UPRi＝UPi+IPiRPi，UPiIs LPiAnd CPiSum of voltages over, IPiIs passing through LPiCurrent of (M)iFor the ith transmitting coil inductance LPiAnd the ith receiving coil inductance LSiMutual inductance value of, Mi＝M，RPiIs the internal resistance of the i-th transmitting coil, RPi＝RP，RSiIs the internal resistance of the i-th receiving coil, RSi＝RSω is the angular frequency of resonance of the system, LPT1Is the inductance value of the first resonant inductor,LPT2the inductance value of the second resonant inductor;
wherein, CPTIs the capacitance value of the resonant capacitor, CPiCompensating the capacitance of the capacitor, C, for the ith transmitter coilSiCompensating the capacitance value of the capacitor, L, for the ith receiving coilPT1Is the inductance value of the first resonant inductor, LPT2The inductance value of the second resonant inductor;
in step 2.5, the formula (4) is calculated by a numerical analysis method:
wherein,
where α is a gain coefficient, and the dc voltage converter V that maximizes the system efficiency can be obtained from the above equations (4) and (5)DCBInduced voltage U ofDCopt。
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| CN109687604B true CN109687604B (en) | 2020-12-01 |
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| CN111082540B (en) * | 2019-12-17 | 2021-03-23 | 西南交通大学 | Multi-tap wireless power transmission system and efficiency optimization method thereof |
| CN113964958B (en) * | 2021-11-12 | 2023-05-26 | 西南交通大学 | Wireless charging system with multiple loads and low leakage magnetic fields and parameter design method thereof |
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