CN104868612B - A kind of resonance type wireless electric energy transmission system based on E class power amplifier - Google Patents
A kind of resonance type wireless electric energy transmission system based on E class power amplifier Download PDFInfo
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Abstract
The present invention provides a kind of resonance type wireless electric energy transmission system based on E class power amplifier, system includes E class power amplifier module, primary impedance converting network, secondary impedance converting network, transmission coil module, load.Wherein E class power amplifier module can produce high_frequency sine wave, and provide electric energy for whole system.Primary impedance converting network is connected with E class power amplifier module and transmitting coil respectively, it is ensured that transmission coil position guarantees the work of E class power amplifier in optimum state in the case where changing；Secondary impedance converting network is connected with receiving coil and load respectively, and efficiency of transmission highest outside E class power amplifier module may be implemented.The present invention adds impedance transformer network appropriate by the primary and secondary side in resonance type wireless electric energy transmission system respectively, E class power amplifier may be implemented in the case where coil position changes still in optimum Working, simultaneity factor obtains highest efficiency of transmission, so that the resonance type wireless electric energy transmission system performance based on E class power amplifier is best.
Description
Technical field
The present invention relates to a kind of resonance type wireless electric energy transmission system based on E class power amplifier more particularly to a kind of addition are double
The resonance type wireless electric energy transmission system of terminal impedance converting network.
Background technique
E class power amplification circuit, i.e. E class power amplifier, working frequency can achieve MHz or more, and circuit structure is very simple
Single, Sofe Switch easy to accomplish, energy conversion efficiency theoretically can achieve 100%, therefore compares and be suitable as resonance type wireless
The high frequency power source of electric energy transmission system.When each component parameters are designed correctly inside E class power amplifier, E class power amplifier not only may be used
To work in zero voltage switch (ZVS) state, and no-voltage derivative may be implemented and open (ZDS) state, at this moment E class power amplifier will
Work is in optimum state, and the output resistance of E class power amplifier is exactly optimal resistance R at this time.
Resonance type wireless electric energy transmission technology has the characteristics that long transmission distance, efficiency of transmission be relatively high, non-radiation type,
Wireless power transmission particularly suitable for moderate distance.Its chief component is transmission coil and load, and transmission coil is general
Reach resonant state by self-resonance or external capacitor, to realize effective transmission of electric energy.But in practical applications, transmission line
Circle is not ideal coil, to consider its internal resistance, and load resistance, which is also not, to be the bigger the better, and there are an optimum values to make system for it
Efficiency of transmission highest.
But in actual system, transmission coil position is easy to happen variation, this mutual inductance between causing coil occurs
Variation, and then the comprehensive performance of system is caused to deteriorate, it is in particular in two aspects, it may be assumed that transmission effect outside first, E class power amplifier
Corresponding optimum load value changes when rate highest, and efficiency of transmission is caused to decline to a great extent；It is equivalent outside second, E class power amplifier
Resistance changes, and is not equal to its best output resistance R, causing E class power amplifier internal resistance to cannot achieve ZDS, (no-voltage derivative is opened
It is logical), or even cannot achieve ZVS (no-voltage is open-minded), so that switch tube voltage, current stress increase, loss increases, or even burns out
Switching tube.
In order to solve problem above, it proposes as with reference to a kind of resonance for adding both-end impedance transformer network shown in FIG. 1
Formula radio energy transmission system.By adding impedance transformer network appropriate respectively in transmitting terminal and receiving end, this system is not only
It can guarantee that E class power amplifier is in optimum Working in the case where transmission coil position changes, that is, meets ZVS and ZDS
Operating condition, and the resonance type wireless electric energy efficiency of transmission outside E class power amplifier can be made to reach highest, so that entirely
The performance of system is best.
Summary of the invention
It is an object of the invention to the resonance type wireless electric energy transmission system for solving currently based on E class power amplifier, there are several realities
Border problem, is in particular in: due to when the original parameter designing of system is unreasonable or transmission coil position changes, E class function
Discharging, road actual working state is bad, and if switch tube voltage or current stress are big, E class power amplifier internal loss is larger, and outer
The low problem of the resonance type wireless electric energy efficiency of transmission in portion.
The purpose of the present invention is realized at least through one of following technical solution:
A kind of resonance type wireless electric energy transmission system based on E class power amplifier, including E class power amplifier module, transmission coil module,
Primary impedance converting network, secondary impedance converting network and load (RL)；Wherein E class power amplifier module is by DC voltage source, chokes
Inductance, driving signal, switching tube, reversed freewheeling diode, shunt capacitance in parallel, filter inductance, filter capacitor composition, E class function
The output end of amplification module generates high frequency sinusoidal alternating current, the high frequency power source as resonance type wireless electric energy transmission system；Transmission
Coil module includes transmitting coil and receiving coil, and wherein transmitting coil is equivalent to by transmitting coil internal resistance, transmitting coil inductance
The RLC series resonance mode formed with transmitting coil resonant capacitance, receiving coil are equivalent to by receiving coil internal resistance, receiving coil
The RLC series resonance mode that inductance and receiving coil resonant capacitance are formed；The input terminal and E class power amplifier of primary impedance converting network
Output end be connected, output end is connected with the transmitting coil in transmission coil module；The input terminal of secondary impedance matching network with
Receiving coil in transmission coil module is connected, and output end is connected with load.
Further, the work of E class power amplifier module meets that no-voltage opens (ZVS) and no-voltage is led at optimum state
Number opens (ZDS), and the equivalent output resistance of E class power amplifier is exactly its corresponding best output resistance at this time；Inside E class power amplifier module
Switching tube driven by high-frequency driving signal；The frequency of high-frequency driving signal, that is, system frequency f range is in 0.5MHz-
Between 50MHz, the duty ratio D=0.5 of switching tube.
Further, the filter branch in E class power amplifier module is connected by filter inductance, filter capacitor, equivalent output resistance
Composition；The quality factor q of filter branch is within the scope of 5-20.
Further, transmitting coil internal resistance RL3With receiving coil internal resistance RL4It include ohmic internal resistance and radiation internal resistance；Transmitting
Coil and receiving coil meet relationship:ω is system angular frequency, meets the π of ω=2 f, L3For hair
Penetrate coil inductance, C3For transmitting coil resonant capacitance, L4For receiving coil inductance, C4For receiving coil resonant capacitance, i.e. emission lines
At system frequency f series resonance occurs for circle and receiving coil；Mutual inductance size between transmitting coil and receiving coil is M, mutually
Sense can change with the variation of the relative position between transmitting coil and receiving coil, that is, transmission coil position.
Further, the load is purely resistive matter, resistance sense property or capacitance-resistance property.
Further, it is made of, is not consumed energy-storage travelling wave tube in primary impedance converting network and secondary impedance converting network
Electric energy, energy-storage travelling wave tube include capacitor and inductance, and the circuit form of primary impedance converting network and secondary impedance converting network is L
Type, T-type or ∏ type.Wherein, L-type impedance transformer network can be divided into two kinds, i.e., positive L-type and inverted L shape, and positive L-type has amplification etc.
The effect of resistance is imitated, inverted L shape has the function of reducing equivalent resistance.
Further, there are one in the case where transmission coil position is determined by the efficiency of transmission η outside E class power amplifier module
Optimal load RL.Optimal, so that efficiency of transmission highest, this optimal load is resistor satisfied
Further, as load RLNot equal to optimal load RL.OptimalWhen, pass through receiving coil and load RLBetween add
Secondary impedance converting network so that from receiving coil output end to the equivalent resistance seen into of load be RL.Optimal；Due to
Secondary impedance converting network does not consume electric energy, then equivalent resistance RL.OptimalThe electric energy of consumption is equal to load RLThe electric energy of consumption,
I.e. peak efficiency transmission may be implemented in system at this time.
Further, the equivalent resistance R of E class function module-externaleqMeet:Work as biography
When defeated coil position changes, equivalent resistance ReqAlso it will change, and work as ReqOutput resistance R best not equal to E class power amplifier
When, by the primary impedance converting network added between E class power amplifier module output end and the input terminal of transmitting coil, so that from
The equivalent resistance R ' that high frequency power source module output end is seen into transmitting coileqMeet: R 'eq=R, at this time E class power amplifier module
Would operate in optimum state, that is, meet ZVS and ZDS condition；Since primary impedance converting network is by energy-storage travelling wave tube capacitor and electricity
Sense is constituted, and does not consume electric energy, therefore the electric energy of E class power amplifier module output is equal to the electric energy that the input terminal of transmitting coil consumes.
Compared with prior art, the invention has the advantages that and technical effect:
For the resonance type wireless electric energy transmission system based on E class power amplifier, by transmitting coil and receiving coil two sides
Impedance transformer network appropriate is added respectively, system can be made in the case where transmission coil position changes, on the one hand
Guarantee the work of E class power amplifier at optimum conditions, that is, meets ZVS and ZDS condition；On the other hand, the electric energy outside E class power amplifier is kept
Efficiency of transmission highest, so that the performance of whole system is best.
Detailed description of the invention
Fig. 1 is the resonance type wireless electric energy transmission system of the invention based on E class power amplifier.
Fig. 2 a, Fig. 2 b are two kinds of internal structure charts (by taking L-type as an example) of impedance transformer network.
Fig. 3 a, Fig. 3 b point are that system adds simulation waveform before and after both-end impedance transformer network.
Specific embodiment
It is further described below in conjunction with specific implementation of the attached drawing to invention, but implementation and protection of the invention is not limited to
This.
As shown in Figure 1, a kind of resonance type wireless electric energy transmission system based on E class power amplifier, including E class power amplifier module I, biography
Defeated coil module II, primary impedance converting network N1, secondary impedance converting network N2 and load RL；Wherein E class power amplifier module I by
By DC voltage source VCC, choke induction L1, driving signal Vg, switching tube S, reversed freewheeling diode VD, shunt capacitance C1 in parallel,
Filter inductance L2, filter capacitor C2 composition can generate high frequency sinusoidal alternating current in output end 11 ', as resonance type wireless electricity
The high frequency power source of energy Transmission system；Transmission coil module ii includes transmitting coil TX and receiving coil RX, wherein transmitting coil
TX is equivalent to by transmitting coil internal resistance RL3, the RLC series resonance that is formed of transmitting coil inductance L3 and transmitting coil resonant capacitance C3
Mode, receiving coil RX are equivalent to by receiving coil internal resistance RL4, receiving coil inductance L4 and receiving coil resonant capacitance C4 formed
RLC series resonance mode, mutual inductance size between transmitting coil TX and receiving coil RX is M；Primary impedance converting network N1
Input terminal be connected with the output end of E class power amplifier, output end is connected with the transmitting coil TX in module ii；Secondary impedance pair net
The input terminal of network N2 is connected with the receiving coil RX in module ii, output end and load RLIt is connected.
The output port of E class power amplifier module is 11 '；The port of transmitting coil TX is 33 ', and the port of receiving coil RX is
44 ', load RLIncoming end be 22 '.The input of primary impedance converting network N1 terminates port 11 ', and output end connects transmitting coil
The port TX 33 '；The input of secondary impedance converting network N2 terminates the port receiving coil RX 44 ', output termination load port 22 '.
E class power amplifier module I provides electric energy for entire resonance type wireless electric energy transmission system, and output waveform is high frequency sinusoidal
Wave.Secondary impedance converting network N2 can to enter in terms of from port 44 ' to load resistance R by designing suitable parameter
Equivalent resistance is equal to optimum load value RL.Optimal, RL.OptimalMeet expression formulaFrom
And make the efficiency of transmission highest outside E class power amplifier module.The case where coil position changes, coil mutual inductance is caused to change
Under, by adding primary impedance converting network N1, the equivalent resistance i.e. E class entered in terms of from port 11 ' to load-side can be made
Power amplifier equivalent output resistance value is equal to the best output resistance R of E class power amplifier, so that the work of E class power amplifier is in optimum state
To realize that no-voltage opens (ZVS) and no-voltage derivative opens (ZDS) condition, so that the resonance entirely based on E class power amplifier
Formula radio energy transmission system working performance is best.
The structure of transmission coil mainly has plane disc type and two kinds of spatially spiral formula.The advantages of plane sandwich wound coil is to occupy
Space is small, is convenient for actual installation, and practical application is wider；Spatially spiral formula coil can produce more uniform magnetic field.It is any
Coil can be equivalent to the cascade of its internal resistance He its inductance, and internal resistance includes Ohmic resistance and radiation resistance.Such as to realize
The resonance type wireless electric energy of coil transmits, then generally requires the external resonant capacitance of series connection, it is made to meet RLC series resonance frequency etc.
In system angular frequency, and meet the π of ω=2 f；If reaching self-resonance state under the action of coil parasitic capacitance, and self-resonance
Frequency is exactly equal to system frequency, then without adding external capacitor.Certainly the present invention includes various types of coils, and is not only limited
In this.
As shown in Fig. 2 a, Fig. 2 b, different impedance transformer networks, impedance transformer network master can be selected for different loads
There are the types such as L-type, T-type, ∏ type, the present invention is temporarily illustrated by taking L-type impedance transformer network as an example, it is not limited to this.
For purely resistive load RLFor, by adding L-type impedance transformer network, arbitrary target resistance value R ' can be equivalent to.L
Type impedance transformer network is there are mainly two types of connection type, as shown in Figure 2 a and 2 b, wherein energy-storage travelling wave tube X1 and X2 be inductance and
The combination (cannot be capacitor or inductance simultaneously) of capacitor, Fig. 2 a are positive L-type impedance transformer network, and wherein reactance part X1, X2 are full
Sufficient expression formula:It can be designed that its corresponding capacitor or electricity according to reactance value X
Inductance value corresponds to an inductance element, and inductance value L meets if X>0: if X<0, corresponding to one
A capacity cell, and capacitor C meets: former resistance R can be equivalent to appoint by positive L-type impedance transformer network
Anticipate target resistance R ', wherein R ' > R；Fig. 3 b is inverted L shape impedance transformer network, and wherein reactance part X1, X2 meet expression formula:It can be designed that its is corresponding inductively or capacitively according to reactance value X
Value corresponds to an inductance element, and inductance value L meets if X>0: if X<0, corresponding to one
Capacity cell, and capacitor C meets: former resistance R can be equivalent to arbitrarily by inverted L shape impedance transformer network
Target resistance R ', wherein R ' < R.
Specific step is as follows for this system design method: in known E class power amplifier DC voltage VCC, working frequency f (switch frequency
Rate), duty ratio D, best output resistance R, filter branch quality factor q, transmitting coil inductance L3 and internal resistance RL3, receiving coil electricity
Feel L4 and internal resistance RL4, mutual inductance M, load resistance RLUnder conditions of: (1) firstly, design the other parameters of E class power amplifier, i.e. chokes
The value of inductance L1, shunt capacitance C1 in parallel, filter inductance L2 and filter capacitor C2.(2) transmitting coil and receiving coil are adjusted
Resonant capacitance (C3, C4), makes its satisfactionThe wherein π f of ω=2, i.e., system reaches resonance shape at this time
State.(3) situation certain in coil position compares actual loading resistance RLOptimum resistance value when being transmitted with system maximal efficiency
RL.OptimalSizeIf RL<RL.Optimal, then positive L-type resistance is added in load end
Resistance switching network carries out impedance transformation to it, and adjusts the parameter of its internal energy-storage travelling wave tube, makes to see into from port 44 ' equivalent
Resistance is RL.Optimal；If RL>RL.Optimal, then impedance transformation is carried out to it in load end addition inverted L shape impedance transformer network, and
The parameter for adjusting its internal energy-storage travelling wave tube, makes the equivalent resistance R seen into from port 44 'L.Optimal.E can be realized at this time
Efficiency of transmission is maximum outside class power amplifier.(4) in the case where coil position is certain, compare equivalent resistance R outside E class power amplifiereqWith
The size of optimal resistance R is (wherein): if Req< R, then in high frequency power source module and hair
Positive L-type impedance transformer network is added between ray circle TX, impedance transformation is carried out to it, and adjust the parameter of its internal energy-storage travelling wave tube,
Make the equivalent resistance R to enter in terms of from port 11 ' to transmitting coil；If Req> R, then high frequency power source and transmitting coil TX it
Between addition inverted L shape impedance transformer network impedance transformation is carried out to it, and adjust the parameter of its internal energy-storage travelling wave tube, make from port
11 ' the equivalent resistances seen into transmitting coil are R.It is designed by above step, it is ensured that the E class in coil change in location
Power amplifier module can guarantee the transmission effect of the resonance type wireless electric energy outside E class power amplifier module still in optimum Working
Rate reaches highest, therefore the performance that the resonance type wireless electric energy transmission system entirely based on E class power amplifier may be implemented reaches best.
According to the above design procedure, a kind of resonance type wireless electric energy transmission system sample based on E class power amplifier is provided here,
It is known: DC input voitage VCC=30V, system operating frequency, that is, switching frequency f=1MHz, duty ratio D=0.5, E class power amplifier is most
Good output resistance R=10 Ω, filter branch quality factor q=10, transmitting coil is consistent with receiving coil parameter to be met: L3=L4
=36 μ H, RL3=RL4=1 Ω can be designed that other parameters value according to following equation:
Filter inductance in a.E class power amplifier
B. filter capacitor
C. paralleled power switches shunt capacitance
D. choke inductionTemporarily take L1=120uH
E. transmission coil series resonant capacitance C3=C4=703.6pF.
Assuming that the mutual inductance size M=2.37uH of transmitting coil and receiving coil under certain relative position, actual loading electricity
Hinder RL=5 Ω, then its simulation waveform is as shown in Figure 3a, and wherein I3 is the electric current of transmitting coil, and I4 is the electricity in receiving coil
Stream, ISTo pass through the electric current of switching tube S, VSFor the voltage at switching tube both ends, it can be seen that switching tube does not realize Sofe Switch,
It is unsatisfactory for ZVS condition, switchs tube current ISThere is very big peak value, this electric current is easy to burn out switching tube S, and simulation value is specific
Are as follows: I3=0.76A, I4=1.9A, IS.max=41.7A, VS.max=75.6V.The biography outside E class power amplifier at this time can then be calculated to obtain
Defeated efficiencyAnd theoretical maximum efficiency of transmission is 87.4%, therefore this system had both been not carried out E class power amplifier
External efficiency of transmission highest, also there is no guarantee that the work of E class power amplifier at optimum conditions, that is, is unsatisfactory for ZVS and ZDS condition.
According to formula it is found that as the mutual inductance M=2.37uH between transmission coil
When, optimum load value RL.Optimal=14.9 Ω, at this time the efficiency of transmission highest outside E class power amplifier.And actual loading resistance RL
=5 Ω, it is therefore desirable to add secondary impedance converting network N2 and carry out impedance transformation to it, specific calculating process is as follows: due to RL<
RL.Optimal, then positive L-type impedance transformer network N2, X1=10.6 Ω, X2=-7 Ω (temporarily taking first group of solution) is used, then it is corresponded to
Reactance parameter value be respectively as follows: L6=1.685uH, C6=22.6nF；Similarly, after adding secondary impedance converting network N2, E
Equivalent resistance outside class power amplifierNot equal to its optimum load value R (R
=10 Ω), it is therefore desirable to it adds primary impedance converting network N1 and impedance transformation is carried out to it, design process is similar to N2, uses
Inverted L shape impedance transformer network N1, X1=-21.286 Ω, X2=7 Ω (temporarily taking second group of solution), then its corresponding reactance parameter value
It is respectively as follows: C5=7.477nF, L5=1.1uH.
Fig. 3 b is the simulation waveform after system addition impedance transformer network, before wherein I3, V3 are impedance transformer network N1
Electric current and voltage, I4, V4 be impedance transformer network N2 before electric current and voltage, IL3For the electric current in receiving coil, ILIt is logical
The electric current of overload resistance, ISTo pass through the electric current of switching tube S, VSFor the voltage at switching tube both ends, it can be seen that impedance transformation
Electric current, voltage in phase before network N 1 and N2, illustrate they by subsequent resistance conversion for another resistance, in addition, opening
Pass pipe not only realizes no-voltage and opens (ZVS), and also approximation realizes no-voltage derivative and opens (ZDS).Switch tube current ISNot yet
Occur spike, simulation value specifically: IL3=1.88A, I4=1.81A, IL=3.03A, IS.max=5A, VS.max=
113.4V.The efficiency of transmission outside E class power amplifier at this time can then be calculated to obtainVery close theoretical maximum passes
Defeated efficiency, therefore by addition both-end impedance transformer network N1 and N2, this system not only realizes efficiency of transmission outside E class power amplifier
Highest, and ensure that the work of E class power amplifier at optimum conditions, that is, meet ZVS and ZDS condition.
When transmission coil position changes, the mutual inductance M between transmitting coil and receiving coil will change therewith, but be
The mentality of designing of system is identical with the above process.
Claims (7)
1. a kind of resonance type wireless electric energy transmission system based on E class power amplifier, it is characterised in that including E class power amplifier module (I), pass
Defeated coil module (II), primary impedance converting network (N1), secondary impedance converting network (N2) and load (RL)；Wherein E class function
Amplification module (I) is by DC voltage source (VCC), choke induction (L1), driving signal (Vg), switching tube (S), reversed freewheeling diode
(VD), shunt capacitance (C1) in parallel, filter inductance (L2), filter capacitor (C2) composition, DC voltage source (VCC) anode, chokes
Inductance (L1), filter inductance (L2), filter capacitor (C2) are sequentially connected, DC voltage source (VCC) cathode pass through driving signal
(Vg) it is connect with the base stage of switching tube (S), one end is connected to chokes electricity after reversed freewheeling diode (VD) is in parallel with switching tube (S)
Feel between (L1), filter inductance (L2), the other end and DC voltage source (VCC) cathode connection, shunt capacitance (C1) in parallel also with
Switching tube (S) is in parallel；The output end (11 ') of E class power amplifier module generates high frequency sinusoidal alternating current, passes as resonance type wireless electric energy
The high frequency power source of defeated system；Transmission coil module (II) includes transmitting coil (TX) and receiving coil (RX), wherein emission lines
Circle (TX) is equivalent to by transmitting coil internal resistance (RL3), transmitting coil inductance (L3) and transmitting coil resonant capacitance (C3) formed
RLC series resonance mode, receiving coil (RX) are equivalent to by receiving coil internal resistance (RL4), receiving coil inductance (L4) and receive line
Enclose the RLC series resonance mode that resonant capacitance (C4) is formed；The input terminal and E class power amplifier module of primary impedance converting network (N1)
Output end be connected, output end is connected with the transmitting coil (TX) in transmission coil module (II)；Secondary impedance converting network
(N2) input terminal is connected with the receiving coil (RX) in transmission coil module (II), output end and load (RL) be connected；Transmitting
Coil resistance (RL3) and receiving coil internal resistance (RL4) it include ohmic internal resistance and radiation internal resistance；Transmitting coil (TX) and reception line
Circle (RX) meets relationship:ω is system angular frequency, meets the π of ω=2 f, L3For transmitting coil electricity
Sense, C3For transmitting coil resonant capacitance, L4For receiving coil inductance, C4For receiving coil resonant capacitance, i.e., transmitting coil (TX) and
At system frequency f series resonance occurs for receiving coil (RX)；Mutual inductance between transmitting coil (TX) and receiving coil (RX) is big
Small is M, and mutual inductance can be with the variation of the relative position between transmitting coil (TX) and receiving coil (RX), that is, transmission coil position
And change；There are an optimal loads in the case where transmission coil position is determined by efficiency of transmission η outside E class power amplifier module
RL.Optimal, so that efficiency of transmission highest, this optimal load meetsRL3For transmitting
Coil resistance, RL4For receiving coil internal resistance.
2. a kind of resonance type wireless electric energy transmission system based on E class power amplifier according to claim 1, which is characterized in that
In optimum state, i.e., no-voltage is opened open-minded with no-voltage derivative, at this time E class power amplifier mould for E class power amplifier module (I) work
The equivalent output resistance (R) of block is exactly its corresponding best output resistance；Switching tube (S) inside E class power amplifier module is by driving
Signal (Vg) drives；The frequency of driving signal, that is, system frequency f range is between 0.5MHz-50MHz, the duty of switching tube
Compare D=0.5.
3. the resonance type wireless electric energy transmission system according to claim 2 based on E class power amplifier, which is characterized in that E class function
Filter branch in amplification module is composed in series by filter inductance (L2), filter capacitor (C2), equivalent output resistance (R)；Filtering branch
The quality factor q on road is within the scope of 5-20.
4. a kind of resonance type wireless electric energy transmission system based on E class power amplifier according to claim 1, which is characterized in that
Load is purely resistive matter, resistance sense property or capacitance-resistance property.
5. a kind of resonance type wireless electric energy transmission system based on E class power amplifier according to claim 1, which is characterized in that
It is made of in primary impedance converting network (N1) and secondary impedance converting network (N2) energy-storage travelling wave tube, does not consume electric energy, energy storage
Element includes capacitor and inductance, the circuit form of primary impedance converting network (N1) and secondary impedance converting network (N2) be L-type,
T-type or ∏ type；Wherein, L-type impedance transformer network includes two kinds, i.e., positive L-type and inverted L shape, positive L-type have amplification equivalent resistance
Effect, inverted L shape have the function of reducing equivalent resistance.
6. a kind of resonance type wireless electric energy transmission system based on E class power amplifier according to claim 1, which is characterized in that
As load (RL) it is not equal to optimal load RL.OptimalWhen, pass through receiving coil (RX) and load (RL) between the secondary impedance added
Converting network (N2), so that the equivalent resistance seen into from receiving coil output end (44 ') to load is RL.Optimal；Due to
Secondary impedance converting network (N2) does not consume electric energy, then equivalent resistance RL.OptimalThe electric energy of consumption is equal to load (RL) consumption
Electric energy, i.e., at this time resonance type wireless electric energy transmission system realize peak efficiency transmission.
7. a kind of resonance type wireless electric energy transmission system based on E class power amplifier according to claim 6, which is characterized in that E
Equivalent resistance R outside class power amplifier moduleeqMeet:When transmission coil position becomes
When change, equivalent resistance ReqAlso it will change, and work as ReqWhen output resistance R best not equal to E class power amplifier module (I), by E
The primary impedance converting network added between class power amplifier module (I) output end (11 ') and the input terminal (33 ') of transmitting coil (TX)
(N1), so that the equivalent resistance R ' to enter in terms of from E class power amplifier module (I) output end (11 ') to transmitting coileqMeet: R 'eq=
R, E class power amplifier module (I) would operate in optimum state at this time, that is, meets no-voltage and open and open condition with no-voltage derivative；By
It is made of in primary impedance converting network (N1) energy-storage travelling wave tube capacitor and inductance, does not consume electric energy, therefore E class power amplifier module
(I) electric energy that input terminal (33 ') of the electric energy exported equal to transmitting coil (TX) consumes.
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| CN108809134A (en) * | 2018-06-08 | 2018-11-13 | 上海电力学院 | Wide load inverter circuit applied to magnet coupled resonant type wireless transmission of electricity |
| CN110971012B (en) * | 2019-12-02 | 2024-07-19 | 广东工业大学 | E-type wireless power transmission device and start control method |
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| US9166562B2 (en) * | 2013-02-25 | 2015-10-20 | Qualcomm Incorporated | Impedance transformation network for improved driver circuit performance |
| US10381874B2 (en) * | 2011-03-25 | 2019-08-13 | Qualcomm Incorporated | Filter for improved driver circuit efficiency and method of operation |
| JP6148234B2 (en) * | 2011-08-04 | 2017-06-14 | ワイトリシティ コーポレーションＷｉｔｒｉｃｉｔｙ Ｃｏｒｐｏｒａｔｉｏｎ | Tunable wireless power architecture |
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