CN104300698A - Resonance enhanced wireless power transmission structure with high resonance frequency stability - Google Patents

Resonance enhanced wireless power transmission structure with high resonance frequency stability Download PDF

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CN104300698A
CN104300698A CN201410620723.1A CN201410620723A CN104300698A CN 104300698 A CN104300698 A CN 104300698A CN 201410620723 A CN201410620723 A CN 201410620723A CN 104300698 A CN104300698 A CN 104300698A
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circuit
electric capacity
voltage
inductance
power transmission
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CN104300698B (en
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朱春波
郭尧
魏国
逯仁贵
宋凯
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

The invention discloses a resonance enhanced wireless power transmission structure with high resonance frequency stability, and relates to the technical field of wireless power transmission. According to the wireless power transmission structure provided by the invention, the change of a coupling coefficient and a load cannot influence the resonance frequency, the primary side works at a constant frequency, the voltage and the current are same in phase, and the design of an absorption circuit and a soft switch is easily realized; due to a secondary-side impedance adjusting circuit, on one hand, the whole back-stage omega 0 frequency component of a rectifier bridge is purely resistive and the load change is guaranteed not to influence the resonance frequency, and on the other hand, the output voltage is stable and the power supply demand of the back-stage load is met; meanwhile, compared with an existing secondary-side wireless power transmission structure, the secondary-side structure proposed by the invention has relatively high resonance value Q, so that the resonance is enhanced, the transmission power under the weak coupling condition is increased, and the transmission efficiency under the weak coupling condition is improved. The resonance enhanced wireless power transmission structure is suitable for wireless power transmission occasions.

Description

A kind of harmonic intensified wireless power transmission structure with high resonance frequency stability
Technical field
The present invention relates to wireless power transmission technical field.
Background technology
For radio energy transmission system, the increase of transmission range or amount of side-shift all can cause coupling coefficient to reduce, thus reduces efficiency of transmission and power, and meanwhile, the change of coupling coefficient can cause Impedance of reflection to change, and causes system off resonance.On the other hand, the change of secondary load characteristic, and load non-linear (as rectifier bridge, non-linear element etc.) all can cause secondary power factor to decline, system off resonance, affects laser propagation effect.
Prior art: in order to solve the system off resonance problem that coupling coefficient or load variations cause, publication number is that CN103151853A discloses a kind of wireless power transmission impedance auto-match device, Real-time Collection reflection coefficient, and by the impedance matching of switch arrays regulating system; Publication number is that CN103178623A discloses a kind of controlled inductance tuner, compensates or make resonant circuit resonance again under new resonant frequency point to off resonance; Publication number is that CN103199634A discloses a kind of phased capacitance tuning device, makes emission of magnetic field circuit, magnetic field receiving circuit maintains original resonating at frequencies, or at new Frequency point again resonance; Publication number is that CN103219807A discloses a kind of adaptive wireless electric energy transmitting device, it is launched LC harmonic oscillator, relaying LC harmonic oscillator and reception LC harmonic oscillator and comprises resonance frequency trimmer, for adjusting resonance frequency when frequency fluctuates among a small circle; Publication number is that CN103607056A discloses the method utilizing secondary-side switch capacitance group to keep nominal resonant frequency; Publication number is the method that CN103516354A discloses the frequency of phase locking tracking of a kind of former limit.Above-mentioned disclosed patent is all by corresponding governor motion, maintains the stable of system resonance frequencies;
Publication number is that CN103746462A discloses a kind of bilateral LCC compensating network for wireless power transmission and tuning methods thereof, by the parameter choose of respective rule, resonance frequency and coil relative position, the loading condition that can realize system have nothing to do, but its secondary is current source characteristic, less stable when system is unloaded, and former limit is when being square-wave voltage excitation, the Current harmonic distortion that inverter circuit exports is serious, is difficult to reliable and stable operation.In the control of power output, publication number is that CN103078414A discloses the controlled wireless electric energy transmission device of a kind of through-put power, periodically turned off by second switch pipe and close, indirectly controlling the work period of magnetic coupling resonant circuit, thus reach the control of wireless power transmission power; Publication number is the Poewr control method that CN103580301A discloses another kind of former limit adjustment.
Summary of the invention
The object of the present invention is to provide a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability, the change of coupling coefficient and load is made not affect resonance frequency, its former limit is fixed work frequently, and electric current and voltage same-phase, be easy to the design of absorbing circuit and Sofe Switch; Secondary impedance regulating circuit makes the ω of the whole rear class of rectifier bridge on the one hand 0frequency component is purely resistive, and the change of proof load does not affect resonance frequency, makes output voltage stabilization on the other hand, meets the power demands of successive load.Meanwhile, relative to existing wireless power transmission secondary structure, the secondary structure that the present invention proposes has larger resonant Q value, thus strengthens resonance, significantly improves the through-put power under weak coupling condition and efficiency.
Have a harmonic intensified wireless power transmission structure for high resonance frequency stability, it comprises: inverter circuit 2, former limit resonant circuit 3, secondary resonant circuit 4, secondary impedance regulating circuit 5, impedance adjustment control circuit 11, voltage collection circuit 6, bandwidth-limited circuit 7, phase compensating circuit 8, full-wave rectifying circuit 9, current collection circuit 10 and No. two voltage collection circuits 12; Wherein:
Former limit resonant circuit 3 comprises inductance L 1, inductance L p, electric capacity C 1, electric capacity C pwith electric capacity C p＇;
Secondary resonant circuit 4 comprises inductance L s, inductance L 2, electric capacity C s, electric capacity C s＇, electric capacity C 2with electric capacity C s2;
The inductance capacitance of former limit resonant circuit 3 and the inductance of secondary resonant circuit 4, electric capacity meet:
ω 0 = C 1 + C p C 1 C p L 1 = C p + C p ′ C p C p ′ L p = C s + C s ′ C s C s ′ L s = 1 L 2 C 2
And:
C s 2 = C 2 1 - C 2 ( ω 0 2 L s - 1 / C s ′ )
Wherein: ω 0for resonance angular frequency during Energy Transfer;
Inverter circuit 2 accesses DC source 1; A power end of described inverter circuit 2 and electric capacity C 1one end connect; Described electric capacity C 1the other end and inductance L 1one end connect; Described inductance L 1the other end simultaneously with electric capacity C pone end and electric capacity C pone end of ＇ connects; Described electric capacity C pthe other end of ＇ and inductance L pone end connect; Described inductance L pthe other end simultaneously with electric capacity C pthe other end be connected with another power output end of inverter circuit 2;
Inductance L sone end and electric capacity C sone end of ＇ connects; Described electric capacity C sthe other end of ＇ simultaneously with electric capacity C s2one end and electric capacity C sone end connect; Described electric capacity C s2the other end simultaneously and inductance L 2one end and electric capacity C 2one end connect; Described electric capacity C 2the other end be connected with a power end of secondary impedance regulating circuit 5 by rectifier bridge;
Inductance L sthe other end and electric capacity C sone end of ＇ connects; Described electric capacity C sthe other end of ＇ simultaneously with electric capacity C sthe other end and inductance L 2the other end connect; Described electric capacity C sthe other end be connected with another power end of secondary impedance regulating circuit 5 by rectifier bridge;
A power output end of secondary impedance regulating circuit 5 is connected with a power input of load; Another power output end of described secondary impedance regulating circuit 5 is connected with another power input of load;
A voltage collection circuit 6 gathers the voltage signal of rectifier bridge input, and the voltage signal output end of a described voltage collection circuit 6 is connected with the voltage signal inputs of bandwidth-limited circuit 7; The voltage signal output end of described bandwidth-limited circuit 7 is connected with the voltage signal inputs of phase compensating circuit 8; The voltage signal output end of described phase compensating circuit 8 is connected with the voltage signal inputs of full-wave rectifying circuit 9; The voltage signal output end of described full-wave rectifying circuit 9 is connected with a voltage signal inputs mouth of impedance adjustment control circuit 11;
Current collection circuit 10 collection enters the current signal of secondary impedance regulating circuit 5, and the current signal output end of described current collection circuit 10 is connected with the current signal input port of impedance adjustment control circuit 11;
The control signal output of described impedance adjustment control circuit 11 is connected with the control signal input of secondary impedance regulating circuit 5;
No. two voltage collection circuits 12 gather the voltage of secondary impedance regulating circuit 5 output, and the voltage output end of described No. two voltage collection circuits 12 is connected with No. two voltage signal inputs mouths of impedance adjustment control circuit 11;
The reference voltage input terminal mouth of impedance adjustment control circuit 11 is for receiving the reference voltage of outside input.
Impedance adjustment control circuit 11 comprises: a voltage input end mouth 113, No. two voltage input end mouths 112, current input terminal mouth 111, reference voltage input terminal mouth 114, voltage error amplifying circuit 115, mlultiplying circuit 116, current error amplifying circuit 117, comparator circuit 118 and switch driving circuits 119;
A voltage input end mouth 113 is connected with a signal input part of mlultiplying circuit 116; Described No. two voltage input end mouths 112 are connected with No. two voltage signal inputs of voltage error amplifying circuit 115; Reference voltage input terminal mouth 114 is connected with No. two voltage signal inputs of voltage error amplifying circuit 115; The output of described voltage error amplifying circuit 117 is connected with No. two signal input parts of mlultiplying circuit 116; The output of mlultiplying circuit 116 is connected with an input of current error amplifying circuit 117; Current input terminal mouth 111 is connected with No. two inputs of current error amplifying circuit 117; The output of described current error amplifying circuit 117 is connected with a signal input part of comparator circuit 118; No. two signal input parts of described comparator circuit 118 are standard signal inputs; The output of described comparator circuit 118 is connected with the signal input part of switch driving circuit 119, and the signal output part of described switch driving circuit 119 is control signal outputs of impedance adjustment control circuit 5.
Secondary impedance regulating circuit 5 comprises switch S t, inductance L t, electric capacity Ct and diode Dt;
The moved end of switch S t is a power input of secondary impedance regulating circuit 5; The control end of described switch S t is the control end of secondary impedance regulating circuit; The quiet end of described switch S t is connected with the negative electrode of diode Dt and one end of inductance L t simultaneously; The anode of described diode Dt is connected with one end of electric capacity Ct simultaneously; The anode of described diode Dt is a power output end of secondary impedance regulating circuit;
The other end of described inductance L t is another power input of secondary impedance regulating circuit 5; The other end of described inductance L t is connected with the other end of electric capacity Ct; The other end of described electric capacity Ct is another power output end of secondary impedance regulating circuit.
For former limit resonant circuit 3, electric capacity C p＇ omits, and inductance L pneed satisfy condition:
L 1 - 1 ω 0 2 C 1 = L p .
For secondary resonant circuit 4, electric capacity C s＇ omits, the L and inductance L s need satisfy condition s<L 2.
For former limit resonant circuit 3, satisfy condition:
L 1 - 1 &omega; 0 2 C 1 = L p .
That is: L 1and C 1the inductance value of series equivalent is less than L p;
For secondary resonant circuit 4, satisfy condition:
L s - 1 &omega; 0 2 C s &prime; < L 2
That is: L sand C sthe equivalent inductance value of ＇ series connection is less than L 2.
The resonance frequency omega of Energy Transfer 0with secondary impedance regulating circuit operating frequency ω 1pass be: ω 1>=10 ω 0.
Adjusting reference voltage is for regulating the output voltage of secondary impedance regulating circuit 5.
When it also comprises n former limit resonant circuit 3, n+1 former limit resonant circuit 3 is connected to parallel way on the ac bus of inverter circuit 2 output, described n >=1.
Compared with prior art, the present invention has following beneficial effect:
1, change (comprising load, character, nonlinear change) the not influential system resonance frequency of coupling coefficient and load, the inversion of former limit works to determine frequency mode, more easily realizes the design of absorbing circuit and Sofe Switch.
2, exporting as adjustable constant pressure source, meeting the demand of successive load by arranging corresponding output voltage.
3, when receiving terminal is unloaded, system input power extremely low (being only the loss of the resistance of former secondary line and inverter circuit), can reliability service.
4, when not having receiving terminal, system input power extremely low (being only the loss of the resistance of former sideline and inverter circuit), can reliability service.
5, the current harmonics component of inverter circuit output is extremely low, improves stability and the reliability of inverter circuit work.
6, there is larger resonant Q value, thus strengthen resonance, in low coupling coefficient situation, obtain high through-put power and efficiency.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram;
Fig. 2 is secondary impedance regulating circuit and impedance adjustment control circuit schematic diagram;
Fig. 3 is the equivalent-circuit model schematic diagram of system;
Connection diagram when Fig. 4 is multi-emitting end;
The voltage current waveform schematic diagram that when Fig. 5 is system works, inverter circuit exports;
Fig. 6 is present system efficiency of transmission and coupling coefficient relation schematic diagram;
Fig. 7 is output voltage gain of the present invention and coupling coefficient relation schematic diagram;
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Main technical points of the present invention comprises:
A, a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability, comprising:
Inverter circuit 2, former limit resonant circuit 3, secondary resonant circuit 4, secondary impedance regulating circuit 5, impedance adjustment control circuit 11, first voltage collection circuit 6, bandwidth-limited circuit 7, phase compensating circuit 8, full-wave rectifying circuit 9, current collection circuit 10 and the second voltage collection circuit 12;
Wherein:
Former limit resonant circuit 3: comprise inductance L 1, L p, electric capacity C 1, C p, C p＇;
Secondary resonant circuit 4: comprise inductance L s, L 2, electric capacity C s, C s＇, C 2, C s2;
The inductance capacitance of former limit resonant circuit 3 and the inductance of secondary resonant circuit 4, electric capacity meet relation:
&omega; 0 = C 1 + C p C 1 C p L 1 = C p + C p &prime; C p C p &prime; L p = C s + C s &prime; C s C s &prime; L s = 1 L 2 C 2
And:
C s 2 = C 2 1 - C 2 ( &omega; 0 2 L s - 1 / C s &prime; )
Wherein: ω 0for resonance angular frequency during Energy Transfer; For former limit resonant circuit, electric capacity C p＇ can cancel, and other inductance capacitances then can not merge; If cancel electric capacity Cp ＇, then inductance L p need satisfy condition when electric capacity Cp ＇ exists, satisfy condition i.e. L 1and C 1the inductance value of series equivalent is less than L p; For secondary resonant circuit, electric capacity C s＇ can cancel, and other inductance capacitances then can not merge; If cancel electric capacity Cs ＇, then inductance L s need satisfy condition L s<L 2; As electric capacity C swhen ＇ exists, satisfy condition i.e. L sand C sthe equivalent inductance value of ＇ series connection is less than L 2;
A voltage collection circuit 6 gathers the voltage signal of rectifier bridge input stage, and this voltage signal is ω through center angular frequency 0bandwidth-limited circuit filtering after become sine wave, applying aspect compensating circuit of going forward side by side, phase compensating circuit be used for compensating band bandpass filter circuit at center angular frequency ω 0phase difference, the voltage signal making it export and the ω of primary signal 0frequency component same-phase, the sine wave that phase compensating circuit exports enters a voltage input end mouth 6 of impedance adjustment control circuit after the process of full-wave rectifying circuit.
During system works, the angular frequency of former limit inverter circuit 2 is constant is ω 0impedance adjustment control circuit 11 is by gathering: step voltage (namely port A both end voltage), 2 rectifier bridge output currents, 3 load voltages, 4 reference voltages before 1 rectifier bridge, above four parameters, control the break-make of secondary impedance regulating circuit breaker in middle device, make port A place ω 0the electric current and voltage same-phase of frequency component, and load voltage is stabilized in set point.By the size of adjusting reference voltage, the output voltage of adjustable system.
Impedance adjustment control circuit 11 comprises: a voltage input end mouth 113, No. two voltage input end mouths 112, current input terminal mouth 111, reference voltage input terminal mouth 114, voltage error amplifying circuit 115, mlultiplying circuit 116, current error amplifying circuit 117, comparator circuit 118 and switch driving circuits 119;
Secondary impedance regulating circuit 5 comprises switch S t, inductance L t, electric capacity Ct, diode Dt;
The voltage of voltage input end mouth 2 and reference voltage input terminal mouth compares by voltage error amplifying circuit, and be multiplied by the input voltage of mlultiplying circuit with voltage input end mouth 1 after its error is amplified, the output of mlultiplying circuit is as current reference signal, compare with the signal of current input terminal mouth, current error amplifying circuit is by the high fdrequency component handling averagely in current error, and current error is sent into comparator circuit, it is ω that another of comparator circuit is input as angular frequency 1sawtooth signal, the output of comparator is switch controlling signal, and controls the turning on and off of secondary impedance regulating circuit breaker in middle device by switch driving circuit.
The resonance frequency omega of B, Energy Transfer 0with secondary impedance regulating circuit operating frequency ω 1pass be: ω 1>=10 ω 0.
When C, transmitting terminal have n (n >=1) former limit resonant circuit, be connected on the ac bus that inverter circuit exports with parallel way during this n former limit resonant circuit
The equivalent-circuit model of D, system as shown in Figure 3, r 0for inverter circuit internal resistance, r pfor former edge emitting Coil resistance, r sfor the internal resistance of secondary receiving coil, for the mutual inductance between transmitting coil and receiving coil, rectifier bridge and rear class thereof are equivalent to load impedance Z, U ifor the output voltage of inverter circuit, U ofor the voltage in equivalent load, if then at system resonance frequencies ω 0place, the total impedance of whole secondary is:
Z secondary=λ 2z+r s(1)
Quality factor during secondary resonance are:
Notice that λ is less than 1, and can pass through its size of changing parameter, therefore from (2) formula, structure proposed by the invention enhances the Q value of secondary resonance.
By the equivalence of secondary total impedance to former limit, the system total impedance of calculating is:
Z in = L 1 - 1 &omega; 0 2 C 1 C p ( r p + &omega; 0 2 M 2 &lambda; 2 Z + r s ) - - - ( 3 )
There is (3) formula visible, when load Z is purely resistive, Z inonly have real part, the change of therefore load or mutual inductance (coupling coefficient) can not cause resonance frequency to be drifted about.In order to make Z be always purely resistive at resonance frequency place, add secondary impedance regulating circuit in secondary rectifier bridge rear class, and pass through the control of secondary control circuit, make output voltage stabilization on the one hand, make the ω of the whole rear class of rectifier bridge on the other hand 0frequency component is purely resistive.
E, when not having load Z, the no-load loss of receiving terminal is:
P no - load = | U oc ( ( X L s + X C s &prime; ) | | X C s ) + ( X L s + X C s &prime; ) + r s | 2 r s
Wherein, U ocfor the open circuit voltage that receiving coil is responded to, for the induction reactance of Ls, for the capacitive reactance of Cs ＇, for the capacitive reactance of Cs, due to be a very large value, structure therefore proposed by the invention has lower no-load loss.
F, when transmitting terminal has the former limit resonant circuit of n (n>=1), be connected on the ac bus that inverter circuit exports with parallel way during this n former limit resonant circuit, now do not have the corresponding former limit resonant circuit receiving receiving terminal only to consume P no-recvthere is the former limit resonant circuit of corresponding receiving terminal then to Load transportation power, and receiving terminal lean on nearer, coupling coefficient is higher, through-put power is larger, therefore this structure switches between the resonant circuit of multiple former limits without the need to using switch, and the character of himself ensure that the former limit resonant circuit acting the closer to receiving terminal is more.
G, inductance L 1value to decide according to the harmonic distortion of inverter circuit output current, L 1value is larger, and its induction reactance is larger, more obvious to the suppression of high-frequency harmonic, thus reduces Current harmonic distortion, but L 1volume larger, cost is higher, and L 1value is crossed conference and is caused former limit resonant circuit close to series resonance, affects the stability of inverter circuit.
H, due to system works time, in transmitting coil and receiving coil, resonance current is very large, therefore relative to L 1and L 2, L pand L swith thicker wire rod coiling to raise the efficiency.

Claims (9)

1. there is a harmonic intensified wireless power transmission structure for high resonance frequency stability, it is characterized in that: it comprises: inverter circuit (2), former limit resonant circuit (3), secondary resonant circuit (4), secondary impedance regulating circuit (5), impedance adjustment control circuit (11), voltage collection circuit (6), bandwidth-limited circuit (7), phase compensating circuit (8), full-wave rectifying circuit (9), current collection circuit (10) and No. two voltage collection circuits (12); Wherein:
Former limit resonant circuit (3) comprises inductance L 1, inductance L p, electric capacity C 1, electric capacity C pwith electric capacity C p＇;
Secondary resonant circuit (4) comprises inductance L s, inductance L 2, electric capacity C s, electric capacity C s＇, electric capacity C 2with electric capacity C s2;
The inductance capacitance on former limit resonant circuit (3) and the inductance of secondary resonant circuit (4), electric capacity meet:
&omega; 0 = C 1 + C p C 1 C p L 1 = C p + C p &prime; C p C p &prime; L p = C s + C s &prime; C s C s &prime; L s = 1 L 2 C 2
And:
C s 2 = C 2 1 - C 2 ( &omega; 0 2 L s - 1 / C s &prime; )
Wherein: ω 0for resonance angular frequency during Energy Transfer;
Inverter circuit (2) access DC source (1); A power end of described inverter circuit (2) and electric capacity C 1one end connect; Described electric capacity C 1the other end and inductance L 1one end connect; Described inductance L 1the other end simultaneously with electric capacity C pone end and electric capacity C pone end of ＇ connects; Described electric capacity C pthe other end of ＇ and inductance L pone end connect; Described inductance L pthe other end simultaneously with electric capacity C pthe other end be connected with another power output end of inverter circuit (2);
Inductance L sone end and electric capacity C sone end of ＇ connects; Described electric capacity C sthe other end of ＇ simultaneously with electric capacity C s2one end and electric capacity C sone end connect; Described electric capacity C s2the other end simultaneously and inductance L 2one end and electric capacity C 2one end connect; Described electric capacity C 2the other end be connected with a power end of secondary impedance regulating circuit (5) by rectifier bridge;
Inductance L sthe other end and electric capacity C sone end of ＇ connects; Described electric capacity C sthe other end of ＇ simultaneously with electric capacity C sthe other end and inductance L 2the other end connect; Described electric capacity C sthe other end be connected by rectifier bridge another power end with secondary impedance regulating circuit (5);
A power output end of secondary impedance regulating circuit (5) is connected with a power input of load; Described another power output end of secondary impedance regulating circuit (5) is connected with another power input of load;
A voltage collection circuit (6) gathers the voltage signal of rectifier bridge input, and the voltage signal output end of a described voltage collection circuit (6) is connected with the voltage signal inputs of bandwidth-limited circuit (7); The voltage signal output end of described bandwidth-limited circuit (7) is connected with the voltage signal inputs of phase compensating circuit (8); The voltage signal output end of described phase compensating circuit (8) is connected with the voltage signal inputs of full-wave rectifying circuit (9); The voltage signal output end of described full-wave rectifying circuit (9) is connected with a voltage signal inputs mouth of impedance adjustment control circuit (11);
Current collection circuit (10) collection enters the current signal of secondary impedance regulating circuit (5), and the current signal output end of described current collection circuit (10) is connected with the current signal input port of impedance adjustment control circuit (11);
The control signal output of described impedance adjustment control circuit (11) is connected with the control signal input of secondary impedance regulating circuit (5);
No. two voltage collection circuits (12) gather the voltage of secondary impedance regulating circuit (5) output, and the voltage output end of described No. two voltage collection circuits (12) is connected with No. two voltage signal inputs mouths of impedance adjustment control circuit (11);
The reference voltage input terminal mouth of impedance adjustment control circuit (11) is for receiving the reference voltage of outside input.
2. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, is characterized in that, for former limit resonant circuit (3), and electric capacity C p＇ omits, and inductance L pneed satisfy condition:
L 1 - 1 &omega; 0 2 C 1 = L p .
3. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, is characterized in that for secondary resonant circuit (4), electric capacity C s＇ omits, the L and inductance L s need satisfy condition s<L 2.
4. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, is characterized in that, for former limit resonant circuit (3), satisfying condition:
L 1 - 1 &omega; 0 2 C 1 = L p
That is: L 1and C 1the inductance value of series equivalent is less than L p;
For secondary resonant circuit (4), satisfy condition:
L s - 1 &omega; 0 2 C s &prime; < L 2
That is: L sand C sthe equivalent inductance value of ＇ series connection is less than L 2.
5. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, is characterized in that the resonance frequency omega of Energy Transfer 0with secondary impedance regulating circuit operating frequency ω 1pass be: ω 1>=10 ω 0.
6. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 2, is characterized in that adjusting reference voltage is for regulating the output voltage of secondary impedance regulating circuit (5).
7. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, when it is characterized in that it also comprises n former limit resonant circuit (3), n+1 former limit resonant circuit (3) is connected on the ac bus that inverter circuit (2) exports with parallel way, described n >=1.
8. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, is characterized in that impedance adjustment control circuit (11) comprising: a voltage input end mouth (113), No. two voltage input end mouths (112), current input terminal mouth (111), reference voltage input terminal mouth (114), voltage error amplifying circuit (115), mlultiplying circuit (116), current error amplifying circuit (117), comparator circuit (118) and switch driving circuits (119);
A voltage input end mouth (113) is connected with a signal input part of mlultiplying circuit (116); Described No. two voltage input end mouths (112) are connected with No. two voltage signal inputs of voltage error amplifying circuit (115); Reference voltage input terminal mouth (114) is connected with No. two voltage signal inputs of voltage error amplifying circuit (115); The output of described voltage error amplifying circuit (117) is connected with No. two signal input parts of mlultiplying circuit (116); The output of mlultiplying circuit (116) is connected with an input of current error amplifying circuit (117); Current input terminal mouth (111) is connected with No. two inputs of current error amplifying circuit (117); The output of described current error amplifying circuit (117) is connected with a signal input part of comparator circuit (118); No. two signal input parts of described comparator circuit (118) are standard signal inputs; The output of described comparator circuit (118) is connected with the signal input part of switch driving circuit (119), and the signal output part of described switch driving circuit (119) is the control signal output of impedance adjustment control circuit (5).
9. a kind of harmonic intensified wireless power transmission structure with high resonance frequency stability according to claim 1, is characterized in that secondary impedance regulating circuit (5) comprises switch S t, inductance L t, electric capacity Ct and diode Dt;
The moved end of switch S t is a power input of secondary impedance regulating circuit (5); The control end of described switch S t is the control end of secondary impedance regulating circuit; The quiet end of described switch S t is connected with the negative electrode of diode Dt and one end of inductance L t simultaneously; The anode of described diode Dt is connected with one end of electric capacity Ct simultaneously; The anode of described diode Dt is a power output end of secondary impedance regulating circuit;
The other end of described inductance L t is another power input of secondary impedance regulating circuit (5); The other end of described inductance L t is connected with the other end of electric capacity Ct; The other end of described electric capacity Ct is another power output end of secondary impedance regulating circuit.
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CN111835092A (en) * 2020-07-27 2020-10-27 北京理工大学 Bilateral LCC compensation network adjusting method and system of wireless charging system
CN111931361A (en) * 2020-07-28 2020-11-13 金陵科技学院 Multi-transmitting single-receiving WPT (Wireless Power transfer) optimization method with adjustable feed electrical parameters
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CN108711950A (en) * 2018-06-04 2018-10-26 哈尔滨工业大学 A kind of topological structure circuit and Parameters design for linearly improving remote-wireless electric energy transmission voltage gain
CN109412278B (en) * 2018-06-07 2024-02-20 乐合数据信息科技江苏有限公司 Self-adaptive magnetic resonance wireless charging device and method
CN109412278A (en) * 2018-06-07 2019-03-01 北京乐界乐科技有限公司 Adaptive magnetic resonance wireless charging device and method
CN110048520A (en) * 2019-05-08 2019-07-23 燕山大学 Primary side has the wireless charging device of C-LCC compensation network
CN111416586A (en) * 2020-04-03 2020-07-14 杭州易百德微电子有限公司 Load structure and radio frequency amplifier formed by same
CN111525708A (en) * 2020-04-28 2020-08-11 国网安徽省电力有限公司检修分公司 S-S topology wide area wireless charging system based on multi-coil switching control
CN111525708B (en) * 2020-04-28 2023-06-30 国网安徽省电力有限公司检修分公司 S-S topology wide area wireless charging system based on multi-coil switching control
CN111835092A (en) * 2020-07-27 2020-10-27 北京理工大学 Bilateral LCC compensation network adjusting method and system of wireless charging system
CN111931361A (en) * 2020-07-28 2020-11-13 金陵科技学院 Multi-transmitting single-receiving WPT (Wireless Power transfer) optimization method with adjustable feed electrical parameters
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