CN110429722A - A kind of parallel connection type fractional order autonomy wireless power transmission systems - Google Patents
A kind of parallel connection type fractional order autonomy wireless power transmission systems Download PDFInfo
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- CN110429722A CN110429722A CN201910664740.8A CN201910664740A CN110429722A CN 110429722 A CN110429722 A CN 110429722A CN 201910664740 A CN201910664740 A CN 201910664740A CN 110429722 A CN110429722 A CN 110429722A
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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
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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Abstract
The invention discloses a kind of parallel connection type fractional order autonomy wireless power transmission systems, including fractional order transmit circuit and fractional order to receive circuit；Fractional order transmit circuit includes the primary side fractional order capacitor that the primary side fractional order inductance coil being connected in series and order are greater than 1, and primary side fractional order capacitor of the order greater than 1 has the property of negative resistance, can provide energy for system；It includes secondary fractional order capacitor and the load in fractional order inductance coil, pair being connected in parallel that fractional order, which receives circuit,.Primary side fractional order capacitor and inductance coil and reception circuit of the present invention using order greater than 1 constitute autonomous system, making primary side fractional order capacitor not is only that circuit provides energy, when order is fixed, the working frequency and capacitance of primary side fractional order capacitor can be with automatic following system Parameters variations simultaneously, to realize the constant of system efficiency of transmission and output power, solve the problems, such as that efficiency decline or output power caused by conventional wireless transmission system changes in resonance frequency shift and the coefficient of coup are unstable.
Description
Technical field
The present invention relates to wireless power transmission or the technical field of wireless power transmission, refer in particular to a kind of parallel connection type fractional order from
Control wireless power transmission systems.
Background technique
In recent years, based near field magnetic coupling electric energy transmission technology by broad development, since its transmission range can be from millimeter
Grade is and safe and efficient to tens Centimeter Levels or even meter level, it is considered to be is hopeful to substitute a kind of transmission of electricity skill of wire transmission
Art.Early stage near field wireless transmission be usually can only tune under a specified distance realization high efficiency of transmission, later frequency with
Track technology and PT, which are symmetrically utilized, allows wireless power transmission systems to realize stable electric energy transmission under different distance.Traditional
It is consistent with receiving unit resonance frequency including only being emitted in system based on frequency-tracking and the symmetrical near field wireless power transmission of PT
Under the conditions of, efficiency of transmission just keeps highest.But by the shadow of environment temperature, load, circumferential metal object or electromagnetic environment etc.
It rings, the resonance frequency of resonator easily shifts in wireless power transmission systems, and therefore, conventional method does not adapt to system by the external world
The case where environment or internal factor interference lead to resonance frequency shift, efficiency of transmission and output power are not able to maintain stabilization.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology and deficiency, proposes a kind of parallel connection type fractional order autonomy nothing
Line transmission system, primary side fractional order capacitor and inductance coil and reception circuit using order greater than 1 constitute autonomous system, make original
Side fractional order capacitor is not only that circuit provides energy, at the same when order is fixed primary side fractional order capacitor working frequency and capacitance
To realize the constant of system efficiency of transmission and output power, it is defeated can to solve conventional wireless with automatic following system Parameters variation
The problem that efficiency declines or output power is unstable caused by electric system changes in resonance frequency shift and the coefficient of coup.
To achieve the above object, a kind of technical solution provided by the present invention are as follows: parallel connection type fractional order autonomy wireless power transmission
System, including fractional order transmit circuit and fractional order receive circuit；The fractional order transmit circuit includes the primary side being connected in series
Fractional order inductance coil and order are greater than 1 primary side fractional order capacitor, and primary side fractional order capacitor of the order greater than 1 has negative resistance
Property, energy can be provided for system；The fractional order receive circuit include the secondary side fractional order inductance coil being connected in parallel,
Secondary side fractional order capacitor and load；The primary side fractional order inductance coil and secondary side fractional order inductance coil pass through magnetic coupling mode
Realize wireless power transmission；There are two types of operating modes for the primary side fractional order capacitor tool: first, capacitor order is constant, work frequency
Rate and capacitance automatic following system Parameters variation are with the work of holding capacitor homeostasis；Second, working frequency is fixed, order and appearance
It is worth automatic following system Parameters variation with the work of holding capacitor homeostasis；
When primary side fractional order capacitor order is constant, capacitance and frequency parameter can automatic following system Parameters variation, with
Realization system efficiency of transmission and power it is constant, primary side fractional order capacitor provides energy, primary side fractional order capacitor for system at this time
The priority task mode fixed in order, primary side fractional order capacitor can automatically select working frequency and capacitance to keep stablizing work
Make, when system parameter variations, primary side fractional order capacitor working frequency and capacitance meeting automatic following system variation, and automatically keep
System efficiency of transmission and output power it is constant, when system parameter variations are more than setting range, primary side fractional order capacitor is automatic
It is switched to the fixed mode of working frequency, to keep steady operation.
Further, the voltage of the primary side fractional order inductance and secondary side fractional order inductance, current differential relationship meet:Phase relation meetsWherein, iLFor fractional order inductive current, vLFor fractional order inductive drop, β is point
Number rank inductance order, and 0 < β≤2, LβFor fractional order inductance inductance value.
Further, the voltage of the primary side fractional order capacitor and secondary side fractional order capacitor, current differential relationship meet:Phase relation meetsWherein, iCFor fractional order capacitance current, vCFor fractional order capacitance voltage, α is point
Number rank capacitor order, CαFor fractional order capacitor's capacity, and the 1 < α of order of primary side fractional order capacitor1< 2, secondary side fractional order electricity
The 0 < α of order of appearance2≤2；
Further, the inductance value of the primary side fractional order inductance coil and order are fixed；Pair side fractional order inductance
The inductance value and order of coil are fixed；The capacitance and order of pair side fractional order capacitor are fixed.
Compared with prior art, the present invention have the following advantages that with the utility model has the advantages that
1, system structure is simple, is not necessarily to high frequency voltage source.
2, system effectiveness can adapt to the variation of the coefficient of coup and resonance frequency automatically.
3, system output power can adapt to the variation of the coefficient of coup and resonance frequency automatically.
4, the working range of system can be changed only by adusting the order of fractional order capacitor.
Detailed description of the invention
Fig. 1 is system model figure of the invention in embodiment.
Fig. 2 is the graph of relation of system efficiency of transmission and the coefficient of coup in embodiment.
Fig. 3 is the graph of relation of system output power and the coefficient of coup in embodiment.
Specific embodiment
For the content and feature that the present invention is further explained, specific embodiments of the present invention are carried out below in conjunction with attached drawing
It illustrates, but implementation and protection of the invention is without being limited thereto.
As shown in Figure 1, parallel connection type fractional order autonomy wireless power transmission systems provided by the present embodiment, including fractional order transmitting
Circuit and fractional order receive circuit；The fractional order transmit circuit includes the primary side fractional order inductance coil L being connected in seriesβ1And rank
Number is greater than 1 primary side fractional order capacitor Cα1, primary side fractional order capacitor C of the order greater than 1α1Property with negative resistance can be to be
System provides energy；It includes the secondary side fractional order inductance coil L being connected in parallel that the fractional order, which receives circuit,β2, secondary side fractional order
Capacitor Cα2With load RL；The primary side fractional order inductance coil Lβ1With secondary side fractional order inductance coil Lβ2Pass through magnetic coupling mode
Realize wireless power transmission.
Primary side fractional order capacitor of the order greater than 1 has the characteristics that apparent energy is constant in the present embodiment, and has two
Kind operating mode: first, capacitor order is constant, working frequency and capacitance automatic following system Parameters variation；The second, working frequency
It is fixed, order and capacitance automatic following system Parameters variation.
According to coupled mode theory, the coupling mode equations of Fig. 1 system are as follows:
G in formula1、τ2The respectively proportion of goods damageds of the ratio of profit increase of transmit circuit and reception circuit, and g1=-(τCa1+τLβ1), τ2
=τCa2+τLβ2+τRL, wherein τCa1、τLβ1、τCa2、τLβ2、τRLThe proportion of goods damageds of each element respectively in circuit,Its
Middle k is Mutual Inductance Coupling coefficient, ω1,ω2Respectively emit and the resonance angular frequency of receiver, expression formula be as follows:
Each element loss rate expression is as follows:
By formula (1) available system, there are the conditions of steady state solution are as follows:
It can be obtained by formula (1) and formula (9) again
System effectiveness general expression, which can then be obtained, is
System output power general expression:
Wherein:
In formula, VCa1For fractional order capacitance voltage virtual value.
Available, the system operating frequency solution by formula (1) are as follows:
When mode of the primary side fractional order capacitor work in order fixation, α is enabled1=α0For constant, therefore it is as available from the above equation
The range for the Mutual Inductance Coupling coefficient united when primary side fractional order capacitor order is fixed are as follows:
kCFor the critical operating point of system.As k < kCWhen, primary side capacitor cannot work in order fixed mode, otherwise primary side
Capacitor is unable to steady operation without working frequency solution, so primary side capacitor automatically switches to working frequency fixed mode at this time, ω=
ω2。
As k > kCWhen, primary side fractional order capacitor works in order fixed mode α1=α0, enable kmThe maximum designed for system
Mutual inductance.According to formula (3)-(9), can obtain when system parameter meets following formula:
τRL> > τCa2+τLβ2 (17)
Then τRL/τ2About constant, and efficiency of transmission can be approximated to be:
Output power is approximately:
SCa1For the apparent energy of primary side fractional order capacitor, therefore from the above equation, we can see that, k >=kCWhen system efficiency of transmission and defeated
Power is unrelated with mutual inductance and resonance frequency out.
As k < kCWhen, by formula (9)-(14), system efficiency of transmission and output power can be obtained are as follows:
If fractional order inductance coil capacitance are as follows: Lβ1=Lβ2=20 μ H/s1-β, inductance order is β1=β2=0.9996, it is secondary
Side capacitor order is α2=0.9993, load resistance RL=600 Ω, secondary side nominal resonant frequency are ω20=2 π * 500kHz,
Selecting primary side fractional order capacitor order is α0=1.02, then can obtain critical point Mutual Inductance Coupling coefficient is kC=0.057.
When receiving circuit resonant frequencies without offset, the relationship of system efficiency of transmission, output power and Mutual Inductance Coupling coefficient
Curve difference is as shown in Figures 2 and 3.By Fig. 2 and Fig. 3 it is found that working as k >=kCWhen, system efficiency of transmission and output power are constant.
As the above analysis, parallel connection type fractional order autonomy wireless power transmission systems of the invention, in the Mutual Inductance Coupling of design
In coefficient range, either Mutual Inductance Coupling coefficient variation either resonance frequency offset, system can realize efficiency and
The constant efficient transmission of output power, with traditional wireless power transmission systems there are notable difference, the advantages of present system, is aobvious for this
And be clear to, it is worthy to be popularized.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (4)
1. a kind of parallel connection type fractional order autonomy wireless power transmission systems, it is characterised in that: including fractional order transmit circuit and fractional order
Receive circuit；The fractional order transmit circuit includes the primary side fractional order inductance coil (L being connected in seriesβ1) and order greater than 1
Primary side fractional order capacitor (Cα1), order is greater than 1 primary side fractional order capacitor (Cα1) property with negative resistance, it can be mentioned for system
For energy；It includes the secondary side fractional order inductance coil (L being connected in parallel that the fractional order, which receives circuit,β2), secondary side fractional order electricity
Hold (Cα2) and load (RL)；The primary side fractional order inductance coil (Lβ1) and pair side fractional order inductance coil (Lβ2) pass through magnetic coupling
Conjunction mode realizes wireless power transmission；The primary side fractional order capacitor (Cα1) there are two types of operating modes for tool: first, capacitor order is permanent
Fixed, working frequency and capacitance automatic following system Parameters variation are with the work of holding capacitor homeostasis；Second, working frequency is solid
Fixed, order and capacitance automatic following system Parameters variation are with the work of holding capacitor homeostasis；
As primary side fractional order capacitor (Cα1) order it is constant when, capacitance and frequency parameter can automatic following system Parameters variation, with
Constant, the primary side fractional order capacitor (C at this time of realization system efficiency of transmission and powerα1) for system provide energy, primary side fractional order
Capacitor (Cα1) the priority task mode fixed in order, primary side fractional order capacitor (Cα1) working frequency and capacitance can be automatically selected
To keep steady operation, when system parameter variations, primary side fractional order capacitor (Cα1) working frequency and capacitance can follow automatically and be
System variation, and the constant of system efficiency of transmission and output power is automatically kept, it is former when system parameter variations are more than setting range
Side fractional order capacitor (Cα1) the fixed mode of working frequency is automatically switched to, to keep steady operation.
2. a kind of parallel connection type fractional order autonomy wireless power transmission systems according to claim 1, it is characterised in that: the primary side
Fractional order inductance (Lβ1) and pair side fractional order inductance (Lβ2) voltage, current differential relationship meet:Phase relation
MeetWherein, iLFor fractional order inductive current, vLFor fractional order inductive drop, β is fractional order inductance order, and 0
< β≤2, LβFor fractional order inductance inductance value.
3. a kind of parallel connection type fractional order autonomy wireless power transmission systems according to claim 1, it is characterised in that: the primary side
Fractional order capacitor (Cα1) and pair side fractional order capacitor (Cα2) voltage, current differential relationship meet:Phase relation
MeetWherein, iCFor fractional order capacitance current, vCFor fractional order capacitance voltage, α is fractional order capacitor order, CαTo divide
Number rank capacitor's capacity, and primary side fractional order capacitor (Cα1) 1 < α of order1< 2, secondary side fractional order capacitor (Cα2) 0 < of order
α2≤2。
4. a kind of parallel connection type fractional order autonomy wireless power transmission systems according to claim 1, it is characterised in that: the primary side
Fractional order inductance coil (Lβ1) inductance value and order be fixed；The pair side fractional order inductance coil (Lβ2) inductance value and rank
Number is fixed；The pair side fractional order capacitor (Cα2) capacitance and order be fixed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110932409A (en) * | 2019-12-17 | 2020-03-27 | 华南理工大学 | Fractional order parallel electric field coupling wireless power transmission system |
| CN110971004A (en) * | 2019-12-17 | 2020-04-07 | 华南理工大学 | Voltage-source-free series autonomous electromagnetic field double-coupling wireless power transmission system |
| CN110971006A (en) * | 2019-12-17 | 2020-04-07 | 华南理工大学 | Parallel autonomous electromagnetic field double-coupling wireless power transmission system |
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| CN108494113A (en) * | 2018-06-04 | 2018-09-04 | 华南理工大学 | A kind of autonomy fractional order series connection wireless power transmission systems |
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| CN103915908A (en) * | 2014-03-31 | 2014-07-09 | 华南理工大学 | Fractional order parallel resonance wireless power transmission system |
| CN203827070U (en) * | 2014-03-31 | 2014-09-10 | 华南理工大学 | Fractional-order serial-parallel connected resonance wireless power transmission system |
| WO2016073867A1 (en) * | 2014-11-07 | 2016-05-12 | Murata Manufacturing Co., Ltd. | Variable-distance wireless-power-transfer system with fixed tuning and power limiting |
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| CN110932409A (en) * | 2019-12-17 | 2020-03-27 | 华南理工大学 | Fractional order parallel electric field coupling wireless power transmission system |
| CN110971004A (en) * | 2019-12-17 | 2020-04-07 | 华南理工大学 | Voltage-source-free series autonomous electromagnetic field double-coupling wireless power transmission system |
| CN110971006A (en) * | 2019-12-17 | 2020-04-07 | 华南理工大学 | Parallel autonomous electromagnetic field double-coupling wireless power transmission system |
| CN110971004B (en) * | 2019-12-17 | 2024-06-04 | 华南理工大学 | Voltage-source-free series autonomous electromagnetic field double-coupling wireless power transmission system |
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