CN117060604B - Wireless power supply system and power transmission system - Google Patents
Wireless power supply system and power transmission system Download PDFInfo
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- CN117060604B CN117060604B CN202311315555.0A CN202311315555A CN117060604B CN 117060604 B CN117060604 B CN 117060604B CN 202311315555 A CN202311315555 A CN 202311315555A CN 117060604 B CN117060604 B CN 117060604B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 54
- 238000012806 monitoring device Methods 0.000 claims description 8
- 230000014509 gene expression Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
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- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- 230000007246 mechanism Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
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- 230000001419 dependent effect Effects 0.000 description 1
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- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
Abstract
The invention discloses a wireless power supply system and a power transmission system, wherein the wireless power supply system comprises: a transmitting side unit, a receiving side unit and n output units; the transmitting side unit comprises a transmitting coil, and is used for converting the accessed direct-current electric energy into alternating-current electric energy and transmitting the alternating-current electric energy to the receiving side unit through the transmitting coil; the receiving side unit comprises a receiving coil which is arranged in pairs with the transmitting coil, the first end of the 1 st output unit is connected with the first end of the receiving coil, the second end of the nth output unit is connected with the second end of the receiving coil, and the second end of the jth output unit is connected with the first end of the (j+1) th output unit; the output unit comprises a resonant voltage dividing unit and a rectifier, wherein the resonant voltage dividing unit is used for enabling reactive power of the load loop to be zero in a resonant state. The invention can solve the problems of large volume, complex structure and high cost in the existing multi-load wireless power supply system.
Description
Technical Field
The invention relates to the technical field of wireless power supply, in particular to a wireless power supply system and a power transmission system.
Background
The current wireless power supply system can be divided into four systems of one-to-one, one-to-many, many-to-one and many-to-many, wherein the one-to-one wireless power supply system comprises an inverter, a transmitting coil and a receiving end, and when the power utilization requirement of the plurality of receiving ends exists, the plurality of inverters and the plurality of transmitting ends are needed, so that the system has a complex structure, poor flexibility, low comprehensive utilization rate and high construction, operation and maintenance costs; two one-to-many wireless power supply systems are provided, one including an inverter, a transmitting coil and a plurality of small receiving coils, and the other including an inverter, a plurality of transmitting coils and a plurality of small receiving coils, all have the problems of low transmission efficiency and serious electromagnetic radiation.
Moreover, each transmitting coil in the existing wireless power supply system is provided with a set of compensation circuit independently, so that the system is large in size, complex in structure and high in cost, most of the systems can only realize the topology function, and the efficiency optimization of the systems cannot be realized.
Disclosure of Invention
The invention provides a wireless power supply system and a power transmission system, which are used for solving the problems of large volume, complex structure and high cost existing in the existing multi-load wireless power supply system.
In a first aspect, an embodiment of the present invention provides a wireless power supply system, including: the device comprises a transmitting side unit, a receiving side unit and n output units, wherein n is a positive integer greater than or equal to 2; the transmitting side unit comprises a transmitting coil, and is used for converting the accessed direct-current electric energy into alternating-current electric energy and transmitting the alternating-current electric energy to the receiving side unit through the transmitting coil; the receiving side unit comprises a receiving coil which is arranged in pairs with the transmitting coil and is used for receiving alternating current power; the first end of the 1 st output unit is connected with the first end of the receiving coil, the second end of the n-th output unit is connected with the second end of the receiving coil, and the second end of the j-th output unit is connected with the first end of the (j+1) -th output unit, wherein j is more than or equal to 1 and less than or equal to n-1; the output unit comprises a resonant voltage division unit and a rectifier, wherein a first end of the resonant voltage division unit is used as a first end of the output unit, a second end of the resonant voltage division unit is used as a second end of the output unit, and the resonant voltage division unit is used for enabling reactive power of the load loop to be zero in a resonant state; the first input end of the rectifier is connected with the third end of the resonant voltage division unit, the second input end of the rectifier is connected with the second end of the resonant voltage division unit, and the rectifier is used for converting alternating current electric energy into direct current electric energy.
Optionally, the resonant voltage dividing unit includes a resonant voltage dividing capacitor and a resonant inductor; the first end of the resonant voltage division capacitor is used as the first end of the resonant voltage division unit, and the second end of the resonant voltage division capacitor is used as the second end of the resonant voltage division unit; the first end of the resonant inductor is connected with the first end of the resonant voltage dividing capacitor, and the second end of the resonant inductor is used as the third end of the resonant voltage dividing unit.
Optionally, the resonant voltage division capacitor is a fixed capacitor.
Optionally, when the wireless power supply system is fully resonant, the resonant voltage division capacitor needs to satisfy the following conditions:
；
wherein,representing imaginary units, ++>Indicating the angular frequency of the current, ">Representing the capacitance value of each resonant voltage division capacitor, +.>Representing the inductance value of the receiving coil,/-, for>The capacitance value of the resonant receiving capacitance.
Optionally, when the wireless power supply system is fully resonant, the resonant voltage division capacitor also needs to meet the following conditions;
；
wherein,phasor value representing the output voltage on each load,/->Representing imaginary units, ++>For the phasor value of the output voltage of the inverter, < >>Indicating the angular frequency of the current, ">Indicating mutual inductance of transmitting coil and receiving coil, +.>The capacitance value of each resonant voltage division capacitor is represented, wherein i is more than or equal to 1 and less than or equal to n.
Optionally, the receiving side unit further includes a resonant receiving capacitor, a first end of the resonant receiving capacitor is connected to the first end of the receiving coil, and a second end of the resonant receiving capacitor is connected to the first end of the 1 st output unit.
Optionally, the transmitting-side unit further includes an inverter; the input end of the inverter is connected with direct current, the first output end of the inverter is connected with the first end of the transmitting coil, and the second output end of the inverter is connected with the second end of the transmitting coil.
Optionally, the transmitting side unit further includes a resonant transmitting capacitor, a first end of the resonant transmitting capacitor is connected to the first input end of the inverter, and a second end of the resonant transmitting capacitor is connected to the first end of the transmitting coil.
In a second aspect, an embodiment of the present invention provides a power transmission system, including: the monitoring device and the wireless power supply system are used for supplying power to the monitoring device; the wireless power supply system comprises the wireless power supply system provided in the first aspect.
The wireless power supply system provided by the embodiment of the invention comprises the transmitting side unit, the receiving side unit and n output units, wherein one receiving coil is shared by a plurality of output units, and a plurality of independent voltage outputs can be realized by only using a pair of coupling mechanisms (namely the receiving coil and the transmitting coil), so that the wireless power supply system is small in size, simple in structure and low in cost.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a wireless power supply system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of yet another wireless power supply system according to an embodiment of the present invention;
fig. 3 is an equivalent circuit model of a wireless power supply system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a wireless power supply system according to an embodiment of the present invention, as shown in fig. 1, where the wireless power supply system includes: a transmitting side unit 11, a receiving side unit 12, and n output units 13, where n is a positive integer greater than or equal to 2.
The transmitting-side unit 11 includes a transmitting coilThe transmitting-side unit 11 is used for switching in direct-current power +.>Converted into alternating current energy and passed through a transmitting coil +.>Transmitting alternating current power to the receiving-side unit 12; the receiving-side unit 12 comprises a transmitting coil->Receiving coils arranged in pairs->Receiving coil->For receiving ac power; the first end of the 1 st output unit is connected with the receiving coil +.>The second terminal of the nth output unit is connected to the receiving coil +.>The second end of the j-th output unit is connected with the first end of the (j+1) -th output unit, wherein j is more than or equal to 1 and less than or equal to n-1; the output unit 13 includes a resonant voltage division unit 30 and a rectifier 31, a first end of the resonant voltage division unit 30 is used as a first end of the output unit 13, a second end of the resonant voltage division unit 30 is used as a second end of the output unit 13, and the resonant voltage division unit 30 is used for enabling reactive power of a load loop to be zero in a resonant state; a first input terminal of the rectifier 31 is connected to the third terminal of the resonant voltage divider unit 30, a second input terminal of the rectifier 31 is connected to the second terminal of the resonant voltage divider unit 30, and the rectifier 31 is configured to convert ac power into dc power.
In particular, the transmitting coilIs tightly wound enameled wire, is excited by a high-frequency power supply, and transmits magnetic field energy transmitted to a receiving coil to the greatest extent by a resonance magnetic coupling principle>A place; finally through the power receiving coil->And receiving the generated high-frequency magnetic field, inducing electromotive force at the low-voltage side according to the electromagnetic induction theorem, and processing by a subsequent circuit to obtain stable direct-current voltage output.
The wireless power supply system also comprises a power taking device arranged on the high-voltage transmission lineThe electric device is used for converting high-voltage direct current on the high-voltage transmission line into low-voltage direct currentTo the transmitting-side unit 11.
Because the high-voltage direct current is obtained after the power is obtained by the power obtaining device on the high-voltage line, the power cannot be directly supplied to the on-column monitoring equipment and the like on the low-voltage side, and therefore a wireless power supply system is required to be adopted, and the electric isolation of power supply equipment and the insulation of the high-voltage side and the low-voltage side are realized. At the same time, through the transmitting coil which can change the wireless power supply systemAnd receive coil->And a relay coil is added between the two coils to improve the transmission distance and the transmission efficiency.
The transmitting-side unit 11 further includes an inverter 110; the input end of the inverter 110 is connected with direct currentThe first output of the inverter is connected to the transmitter coil>Is connected to the first terminal of the inverter 110, the second output terminal of which is connected to the transmitting coil>Is connected to the second end of the first connector.
The output units 13 are configured to output direct current, and the voltages output by the respective output units 13 may be the same or different.
The resonant voltage divider unit 30 may be an LC series resonant circuit in which the reactive power of the load loop is zero when the resonant state is reached. This means that although there is an ac signal through the LC series resonant circuit, no energy is converted or dissipated in the output unit 13. This is because in the resonant state, the energy provided by the active elements in the receiving unit 12 is stored in the inductor and capacitor and exchanged back and forth throughout the cycle.
Specifically, when the capacitor is charged, energy is transferred from the generator into the capacitor. When the capacitor discharges, energy is transferred from the capacitor into the inductor. In this way, the energy in the LC series resonant circuit is exchanged back and forth throughout the cycle, but the total energy remains unchanged. In the resonance state, the reactive power of the load loop is zero.
The type of rectifier 31 may be selected according to actual needs. The rectifier 31 may be full-wave rectification, half-wave rectification, or bridge rectification, for example.
With continued reference to fig. 1, the wireless power supply system operates according to the following principles: the transmitting side unit 11 converts the connected DC power into AC power and passes through the transmitting coilA receiving coil for transmitting the alternating current power to the receiving-side unit 12>The rectifier 31 in the output unit 13 converts this alternating current energy into direct current to the device to be supplied (in the figure with load resistance +.>，/>，…，/>，/>Schematic) is powered. Wherein the device to be powered can be a monitoring device or the like.
The wireless power supply system provided by the embodiment of the invention comprises the transmitting side unit, the receiving side unit and n output units, wherein one receiving coil is shared by a plurality of output units, and a plurality of independent voltage outputs can be realized by only using a pair of coupling mechanisms (namely the receiving coil and the transmitting coil), so that the wireless power supply system is small in size, simple in structure and low in cost.
Fig. 2 is a schematic structural diagram of still another wireless power supply system according to an embodiment of the present invention, and as shown in fig. 2, optionally, the receiving-side unit 12 further includes a resonant receiving capacitorResonance receiving capacitance->Is>Is connected to the first terminal of the resonant receiving capacitor>Is connected to the first end of the 1 st output unit.
The transmitting-side unit 11 further includes an inverter 110; the input end of the inverter 110 is connected with direct currentThe first output of the inverter is connected to the transmitter coil>Is connected to the first terminal of the inverter 110, the second output terminal of which is connected to the transmitting coil>Is connected to the second end of the first connector.
Inverter 110 may be a half bridge inverter or a full bridge inverter. Inverter 110 is configured to receive dc powerAnd the DC power is added>Converted into alternating current electric energy. Illustratively, as shown in fig. 2, the inverter 110 may be a full-bridge inverter that includes four switching devices S1, S2, S3, and S4.
The transmitting-side unit 11 also includes resonanceTransmitting capacitorResonance emission capacitance->Is connected to the first input of the inverter 110, resonance emission capacitance +.>Is associated with the transmitting coil>Is connected to the first end of the housing.
Alternatively, the resonant voltage dividing unit 30 includes a resonant voltage dividing capacitance and a resonant inductance; the first end of the resonant voltage division capacitor is used as the first end of the resonant voltage division unit, and the second end of the resonant voltage division capacitor is used as the second end of the resonant voltage division unit; the first end of the resonant inductor is connected to the first end of the resonant voltage dividing capacitor, and the second end of the resonant inductor is used as the third end of the resonant voltage dividing unit 30. The resonant voltage-dividing capacitor is a fixed capacitor.
Specifically, the resonant voltage-dividing unit of the 1 st output unit includes a first resonant voltage-dividing capacitorAnd a first resonant inductance->The resonant voltage-dividing unit of the 2 nd output unit comprises a second resonant voltage-dividing capacitor>And a second resonance inductance->The resonance voltage division unit of the n-1 th output unit comprises an n-1 th resonance voltage division capacitor +.>And n-1 th resonance inductance->The resonance voltage division unit of the nth output unit comprises an nth resonance voltage division capacitor +.>And n < th > resonant inductance->。
An equivalent circuit model of the wireless power supply system can be established according to the operation state data, and fig. 3 is an equivalent circuit model of the wireless power supply system provided by the embodiment of the invention, and an output voltage expression of each output unit when the wireless power supply system integrally resonates is determined based on the equivalent circuit model; and determining the capacitance value of each resonant voltage division capacitor according to the output voltage expression of each output unit so as to enable the whole wireless power supply system to resonate.
Specifically, according to the load resistance，/>，…，/>Calculating the equivalent load of the output unit:
；
wherein,representing output unit equivalent load, +.>The resistance of the load resistor is shown.
According to kirchhoff's voltage law, determining the following equivalent circuit complete model by writing a loop equation of the wireless power supply system:
；
wherein:a phasor value for the inverter output voltage; />、/>、/>、/>、…、/>The current phase values of the transmitting coil loop, the receiving coil loop and the voltage output loops of the output units are respectively +.>、/>Internal resistances of the transmit coil loop and the receive coil loop, respectively, M representing the transmit coil +.>And receive coil->Mutual inductance between->Representing plural units->Indicating the angular frequency of the current, ">、/>…、/>The capacitance value of each resonant voltage division capacitor, < + >>、/>、…、/>Respectively equivalent loads of the output units.
、/>、/>The reactance of the transmit coil loop, the receive coil loop, and the voltage output loop of each output unit are represented separately, and can be expressed as:
；
wherein,representing the capacitance value of the resonant receiving capacitance, +.>Representing the capacitance value of the resonant transmit capacitance.
In order to improve the timeliness of resonance adjustment, in the embodiment, the equivalent circuit complete model is simplified and analyzed, the internal resistance of the coil is ignored, and the current of each loop is solved by using mathematical knowledge as follows:
；
that is, each loop current expression is:
；
on the premise of obtaining the loop currents, the output voltages of the output units can be obtained and expressed as:
；
wherein,phasor value representing the output voltage on each load,/->Representing imaginary units, ++>For the phasor value of the output voltage of the inverter, < >>Indicating the angular frequency of the current, ">Indicating mutual inductance of transmitting coil and receiving coil, +.>The capacitance value of each resonant voltage division capacitor is represented, wherein i is more than or equal to 1 and less than or equal to n.
As can be seen from the output voltage expressions of the respective output units, the output voltages on the respective loads are independent of the loads and do not affect each other, and are dependent only on the input voltage, the resonance frequency, the mutual inductance and the resonance voltage dividing capacitance, and the output voltages on the respective loads are constant output voltages independent of the loads. Since the input voltage, resonant frequency and mutual inductance are generally fixed when the wireless power supply system is fixed, the output voltage on each load depends on the resonant voltage-dividing capacitance。
When the wireless power supply system is fully resonant, the reactance of each loop is zero, i.eThe resonant voltage-dividing capacitor needs to meet the following conditions:
；
wherein,representing imaginary units, ++>Indicating the angular frequency of the current, ">Capacitance value representing resonant voltage division capacitance, +.>Representing the inductance value of the receiving coil,/-, for>The capacitance value of the resonant receiving capacitance.
Meanwhile, when the wireless power supply system is completely resonant, in order to realize the required output voltage, the resonant voltage-dividing capacitor also needs to meet the following conditions:
；
wherein,phasor value representing the output voltage on each load,/->Representing imaginary units, ++>For the phasor value of the output voltage of the inverter, < >>Indicating the angular frequency of the current, ">Indicating mutual inductance of transmitting coil and receiving coil, +.>The capacitance value of each resonant voltage division capacitor is represented, wherein i is more than or equal to 1 and less than or equal to n.
With continued reference to fig. 2, the wireless power supply system operates on the following principles: inverter 110 receives DC powerAnd the DC power is added>Converted into alternating current electric energy. Transmitting coil->Receives the ac power output from the inverter 110 and generates an alternating magnetic field. Receiving coil->Inducing the alternating magnetic field and converting the alternating magnetic field into alternating electrical energy. The ac power output by the inverter 110 and the ac power received by the rectifier 31 may be the same or different. The rectifier 31 receives the ac power and converts the ac power into dc power to power the device to be powered (illustrated by load resistors RL1, RL2, …, RLn) connected to the rectifier 31. Wherein the device to be powered can be a monitoring device or the like.
The wireless power supply system of this embodiment receives the ac power output by the inverter through the transmitting coil, and generates the alternating magnetic field, inducts the alternating magnetic field through the receiving coil, and converts the alternating magnetic field into the ac power, and makes the wireless power supply system resonate through the resonance voltage dividing unit, and then makes the reactive power of the load loop be zero, improves the output efficiency of the wireless power supply system, receives the ac power through the rectifier, and converts the ac power into the dc power, for the equipment to be powered that is connected with the rectifier, through sharing a receiving coil with a plurality of output units, only use a pair of coupling mechanisms (i.e. receiving coil and transmitting coil), a plurality of independent voltage outputs can be realized, small volume, simple structure, low cost, and can be seen from the output voltage expression of each output unit, the output voltage on each load is irrelevant with the load and each output voltage is not affected by each other, and is relevant with the input voltage, resonance frequency, mutual inductance and resonance voltage dividing capacitance, that is the output voltage on each load is constant output voltage irrelevant with the load.
In one embodiment, there is provided a power transmission system including: the monitoring device and the wireless power supply system are used for supplying power to the monitoring device; the wireless power supply system comprises the wireless power supply system provided by any embodiment.
The monitoring equipment is arranged on the power tower and comprises various data acquisition devices and a monitoring host, wherein the various data acquisition devices are used for analyzing and acquiring various data (such as temperature, humidity, wind direction ratio and the like) of the power transmission line and the surrounding; the monitoring host controls each data acquisition device in the front end acquisition unit through a preset program, and is also internally provided with a network transmission unit for transmitting various processed data to the monitoring center at high speed. The monitoring center consists of a server set and platform software, and can analyze the received data to perform qualitative and quantitative analysis and trend prediction on the state of the power transmission line in operation. The wireless power supply system is used for supplying power to the monitoring equipment, and the wireless power supply system can be set according to the embodiments of the wireless power supply system.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. A wireless power supply system, comprising: the device comprises a transmitting side unit, a receiving side unit and n output units, wherein n is a positive integer greater than or equal to 2;
the transmitting side unit comprises a transmitting coil, and is used for converting the accessed direct-current electric energy into alternating-current electric energy and transmitting the alternating-current electric energy to the receiving side unit through the transmitting coil;
the receiving side unit comprises a receiving coil which is arranged in pairs with the transmitting coil and is used for receiving the alternating current power;
the first end of the 1 st output unit is connected with the first end of the receiving coil, the second end of the nth output unit is connected with the second end of the receiving coil, and the second end of the j-th output unit is connected with the first end of the (j+1) -th output unit, wherein j is more than or equal to 1 and less than or equal to n-1;
the output unit comprises a resonant voltage division unit and a rectifier, wherein a first end of the resonant voltage division unit is used as a first end of the output unit, a second end of the resonant voltage division unit is used as a second end of the output unit, and the resonant voltage division unit is used for enabling reactive power of a load loop to be zero in a resonant state;
the first input end of the rectifier is connected with the third end of the resonant voltage division unit, the second input end of the rectifier is connected with the second end of the resonant voltage division unit, and the rectifier is used for converting the alternating current electric energy into direct current electric energy;
the resonant voltage division unit comprises a resonant voltage division capacitor and a resonant inductor;
the first end of the resonant voltage division capacitor is used as the first end of the resonant voltage division unit, and the second end of the resonant voltage division capacitor is used as the second end of the resonant voltage division unit;
the first end of the resonant inductor is connected with the first end of the resonant voltage dividing capacitor, and the second end of the resonant inductor is used as the third end of the resonant voltage dividing unit;
when the wireless power supply system is completely resonant, the resonant voltage division capacitor needs to meet the following conditions:
；
wherein,representing imaginary units, ++>Indicating the angular frequency of the current, ">Representing the capacitance value of each resonant voltage division capacitor, +.>Representing the inductance value of the receiving coil,/-, for>The capacitance value of the resonant receiving capacitance.
2. The wireless power supply system of claim 1 wherein said resonant voltage divider capacitor is a fixed capacitor.
3. The wireless power supply system of claim 1, wherein said resonant voltage divider capacitance is further required to satisfy the following condition when said wireless power supply system is fully resonant;
；
wherein,phasor value representing the output voltage on each load,/->Representing imaginary units, ++>For the phasor value of the output voltage of the inverter, < >>Indicating the angular frequency of the current, ">Indicating mutual inductance of transmitting coil and receiving coil, +.>The capacitance value of each resonant voltage division capacitor is represented, wherein i is more than or equal to 1 and less than or equal to n.
4. The wireless power supply system of claim 1, wherein said receiving side unit further comprises a resonant receiving capacitor, a first end of said resonant receiving capacitor being connected to a first end of said receiving coil, a second end of said resonant receiving capacitor being connected to a first end of said 1 st said output unit.
5. The wireless power supply system of claim 1, wherein said transmitting side unit further comprises an inverter;
the input end of the inverter is connected with direct current, the first output end of the inverter is connected with the first end of the transmitting coil, and the second output end of the inverter is connected with the second end of the transmitting coil.
6. The wireless power supply system of claim 5, wherein said transmitting side unit further comprises a resonant transmitting capacitor, a first end of said resonant transmitting capacitor being connected to a first input of said inverter, and a second end of said resonant transmitting capacitor being connected to a first end of said transmitting coil.
7. A power transmission system, comprising: a monitoring device and a wireless power supply system for powering the monitoring device; the wireless power supply system comprising the wireless power supply system of any one of claims 1-6.
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