CN114006477A - Wireless power transmission system operating in time solitary wave state and control method thereof - Google Patents

Wireless power transmission system operating in time solitary wave state and control method thereof Download PDF

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CN114006477A
CN114006477A CN202111261452.1A CN202111261452A CN114006477A CN 114006477 A CN114006477 A CN 114006477A CN 202111261452 A CN202111261452 A CN 202111261452A CN 114006477 A CN114006477 A CN 114006477A
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power transmission
wireless power
solitary wave
magnetic coupling
nonlinear
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CN114006477B (en
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谢帆
陈锦涛
张波
肖文勋
丘东元
陈艳峰
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South China University of Technology SCUT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

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Abstract

The invention discloses a wireless power transmission system operating in a time solitary wave state and a control method thereof, wherein the wireless power transmission system comprises a nonlinear power electronic converter, a time solitary wave state controller and a magnetic coupling resonance wireless power transmission structure; the nonlinear power electronic converter consists of a direct-current voltage source and an inverter circuit and is used as a power supply to drive the magnetic coupling resonance wireless power transmission structure; the time solitary wave state controller consists of a sampling circuit, a solitary wave resolver and a driving circuit, and the output of the time solitary wave state controller is used for driving the nonlinear power electronic converter. According to the invention, the primary current is sampled, and the converter is controlled by the solitary wave resolver in real time to generate a nonlinear driving power supply so as to balance the parameter dispersion of the magnetic coupling resonance wireless power transmission structure, so that the system is operated in a high-efficiency wireless power transmission state. The invention eliminates the parameter dispersion phenomenon from the time solitary wave principle so as to achieve the purpose of high-efficiency wireless power transmission.

Description

Wireless power transmission system operating in time solitary wave state and control method thereof
Technical Field
The invention relates to the technical field of wireless power transmission or non-contact power transmission, in particular to a wireless power transmission system operating in a time solitary wave state and a control method thereof.
Background
The wireless power transmission technology has wide application prospect due to the non-contact energy transmission. Among the existing wireless power transmission technologies, the magnetic coupling resonance wireless power transmission technology has outstanding advantages of flexibility and safety in principle, and can realize wireless power transmission at a proper distance. The mature application of the compound can be expected to bring important development to various fields such as home, medical treatment, military and the like.
At present, the main reasons for limiting the further popularization and application of magnetic coupling wireless power transmission are as follows: 1. the system can realize high-efficiency energy transmission only by operating at a resonant frequency, and the resonant frequency is easy to shift due to load, environmental change or circuit element aging, so that the detuning phenomenon occurs; 2. the introduction of the secondary communication device to control the operating frequency of the system for tuning increases the circuit cost and is complicated to control.
Soliton (or soliton) is a concept in nonlinear science, and is one of the popular technologies in many fields, and the research and development of soliton in nonlinear optics makes the optical communication technology a great breakthrough.
The wireless power transmission technology uses electromagnetic waves as an energy transmission medium, and light is a special electromagnetic wave. By taking the advantages of the solitary wave technology, the control theory of the novel magnetic coupling resonance wireless power transmission system is significant.
Disclosure of Invention
A first object of the present invention is to overcome the drawbacks and disadvantages of the prior art, and to provide a wireless power transmission system operating in a time solitary wave state, which samples a primary current without using a secondary communication device, so as to achieve the purpose of low cost, high efficiency, simple control, and stable wireless power transmission.
A second object of the present invention is to provide a control method of a wireless power transmission system operating in a time soliton state.
The first purpose of the invention is realized by the following technical scheme: a wireless power transmission system operating in a time solitary wave state comprises a nonlinear power electronic converter, a time solitary wave state controller and a magnetic coupling resonance wireless power transmission circuit; the nonlinear power electronic converter generates high-frequency square wave alternating current according to the input of the time solitary wave state controller, and the high-frequency square wave alternating current is used as a power supply to drive the magnetic coupling resonance wireless power transmission structure to operate; the time solitary wave state controller consists of a sampling circuit, a solitary wave resolver and a driving circuit, wherein the sampling circuit is respectively connected with a primary side of the magnetic coupling resonance wireless power transmission structure and the solitary wave resolver, the solitary wave resolver is connected with the driving circuit, and the driving circuit is connected with an inverter circuit of the nonlinear power electronic converter and is used for driving the nonlinear power electronic converter; the solitary wave state controller samples the primary current of the magnetic coupling wireless power transmission structure, and according to the dispersion rule of the resonant frequency to each parameter of the structure, the solitary wave state controller generates a driving signal with corresponding frequency in real time after being solved by the solitary wave solver, so that the nonlinear effect of the nonlinear power electronic converter is balanced with the dispersion rule of the resonant frequency.
Preferably, the solitary wave resolver is a comparator, the sampling circuit samples the primary current of the magnetic coupling resonance wireless power transmission structure and inputs the primary current into a plus input end of the comparator, a minus input end of the comparator is grounded, the output of the comparator is amplified by a driving circuit and then drives an inverter circuit of a nonlinear power electronic converter, the nonlinear power electronic converter is composed of a direct current voltage source and an inverter circuit composed of a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, the positive electrode of the direct current voltage source is respectively connected with the first switching tube and the third switching tube, the negative electrode of the direct current voltage source is respectively connected with the second switching tube and the fourth switching tube, the first switching tube is connected with the second switching tube, the third switching tube is connected with the fourth switching tube, wherein the driving currents of the first switching tube and the fourth switching tube are in phase, the driving currents of the second switching tube and the third switching tube are in the same phase.
Preferably, the magnetic coupling resonance wireless power transmission structure consists of a primary side compensation capacitor, a primary side coil, a primary side inherent resistor, a secondary side compensation capacitor, a secondary side coil, a secondary side inherent resistor and a load, wherein the primary side compensation capacitor, the primary side inherent resistor and the primary side coil are connected in series and then connected with two output ends of the nonlinear power electronic converter; the primary coil and the secondary coil of the magnetic coupling resonance wireless power transmission structure and the primary compensation capacitor and the secondary compensation capacitor respectively form a series resonance circuit which meets the requirement
Figure BDA0003325627020000031
Wherein L is1、L2Is the self-inductance value of the primary and secondary side coils, C1、C2The capacitance values of the primary and secondary compensation capacitors are used, and omega is the angular frequency of the system.
The second purpose of the invention is realized by the following technical scheme: a method of controlling a wireless power transmission system operating in a time soliton state, comprising the steps of:
1) according to the soliton wave theory, the conditions for the system to operate in the soliton wave state are set as follows:
Figure BDA0003325627020000032
first left item of equal sign
Figure BDA0003325627020000033
Alpha is a dispersion effect of the resonant frequency, and refers to various parameters of the magnetic coupling resonant wireless power transmission structure, which is an inherent effect of the magnetic coupling resonant wireless power transmission structure; the second term is a nonlinear effect, and delta n refers to the nonlinear effect of the nonlinear power electronic converter;
2) for a magnetic coupling resonance wireless power transmission structure, a nonlinear power electronic converter is arrangedHas an output of uinResonant capacitance C ═ C1＝C2The coil inductance L ═ L1＝L2Mutual inductance between coils is M, and load is RLThe loop resistance is R1、R2I.e. the inherent resistance of the primary side and the secondary side; the expression formula of the resonance frequency is obtained according to the kirchhoff voltage law and the mechanical vibration theory as follows:
Figure BDA0003325627020000034
the expression is the dispersion effect of the resonant frequency of the magnetic coupling resonant wireless power transmission structure, wherein the natural frequency of the circuit
Figure BDA0003325627020000035
Coefficient of coil coupling
Figure BDA0003325627020000036
3) Sampling a primary side loop current of a magnetic coupling resonance wireless power transmission structure, controlling a nonlinear power electronic converter in real time through a time solitary wave state controller, and generating corresponding delta n omega to balance the dispersion effect of resonance frequency, namely enabling a system to keep a high-efficiency running solitary wave state; the constructed solitary wave resolver takes a dispersion rule capable of balancing the resonant frequency of the magnetic coupling resonance wireless power transmission structure as a standard.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the method can keep the state of the isolated wave running with high efficiency in a certain transmission range, overcome the defect of insufficient transmission distance of the inductive wireless power transmission technology, and make up the defect of fixed transmission distance of the magnetic coupling resonant wireless power transmission technology.
2. And secondary communication equipment is not needed, so that the cost and the system complexity are reduced, and the system reliability is improved.
3. Compared with a microwave type wireless power transmission mode, the invention can achieve higher transmission power based on the magnetic coupling wireless power transmission principle.
4. The structure of the invention is an improvement based on a general magnetic coupling wireless power transmission structure, and has strong applicability and simple structure.
5. The energy transmission of the invention is based on the resonance principle and can reduce the magnetic interference to the non-resonance body (such as a human body) between the transmission coils.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic diagram of a time soliton state controller.
Fig. 3 is a schematic diagram of a magnetic coupling resonance wireless power transmission structure.
FIG. 4 is a circuit diagram of the system simulation of the present invention.
FIG. 5 is a diagram of simulation results of the system of the present invention.
FIG. 6 is a diagram of FFT analysis of simulation results of the system of the present invention.
FIG. 7 is a diagram of the results of a system simulation of an untimed solitary wave state controller.
Detailed Description
The present invention will be further described with reference to the following specific examples.
As shown in fig. 1 and fig. 2, the present embodiment provides a wireless power transmission system operating in a time solitary wave state, including a nonlinear power electronic converter, a time solitary wave state controller, and a magnetic coupling resonance wireless power transmission structure; the nonlinear power electronic converter is composed of a direct-current voltage source E and a first switching tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4The positive pole of the DC voltage source E is respectively connected with the first switch tube S1And a third switching tube S3The negative electrode of the DC voltage source E is respectively connected with a second switch tube S2And a fourth switching tube S4Connection, the first switching tube S1And a second switch tube S2Connection, the third switching tube S3And a fourth switching tube S4Connecting; the magnetic coupling resonance wireless power transmission structure comprises a primary side compensation capacitor, a primary side coil and a primary side inherent resistanceThe secondary side compensation capacitor, the secondary side coil, the secondary side intrinsic resistor and the load are connected in series and then connected with the two output ends of the nonlinear power electronic converter, the secondary side compensation capacitor, the secondary side coil, the secondary side intrinsic resistor and the load are connected in series, and the primary side coil and the secondary side coil are coupled and transmit energy through circuit resonance; the nonlinear power electronic converter generates high-frequency square wave alternating current according to the input of the time solitary wave state controller, and the high-frequency square wave alternating current is used as a power supply to drive the magnetic coupling resonance wireless power transmission structure to operate; the time solitary wave state controller consists of a sampling circuit, a solitary wave resolver and a driving circuit, wherein the sampling circuit is respectively connected with a primary side of the magnetic coupling resonance wireless power transmission structure and the solitary wave resolver, the solitary wave resolver is connected with the driving circuit, and the driving circuit is connected with an inverter circuit of the nonlinear power electronic converter and is used for driving the nonlinear power electronic converter; the solitary wave state controller samples the primary current of the magnetic coupling wireless power transmission structure, and according to the dispersion rule of the resonant frequency to each parameter of the structure, the solitary wave state controller generates a driving signal with corresponding frequency in real time after being solved by the solitary wave solver, so that the nonlinear effect of the nonlinear power electronic converter is balanced with the dispersion rule of the resonant frequency.
Preferably, in this embodiment, the soliton wave resolver is a comparator, the sampling circuit samples a primary current of the magnetic coupling resonance wireless power transmission structure and inputs the primary current to a + input terminal of the comparator, a-input terminal of the comparator is grounded, and an output of the comparator is amplified by the driving circuit and drives an inverter circuit of the nonlinear power electronic converter, wherein the first switching tube S is connected to the ground1And a fourth switching tube S4The driving current of (A) is in phase, the second switch tube S2And a third switching tube S3Are in phase.
The primary coil and the secondary coil of the magnetic coupling resonance wireless power transmission structure and the primary compensation capacitor and the secondary compensation capacitor respectively form a series resonance circuit which meets the requirement
Figure BDA0003325627020000061
Wherein L is1、L2Is the self-inductance value of the primary and secondary side coils, C1、C2The capacitance values of the primary and secondary compensation capacitors are used, and omega is the angular frequency of the system.
In nonlinear optics, when light is transmitted in an optical fiber, dispersion effect exists to widen the waveform, but nonlinear effect such as self-phase modulation can cause waveform compression, and when the nonlinear effect completely compensates the dispersion effect of the light, the light pulse can keep the waveform unchanged in a time domain to form a time optical soliton. The dynamic behavior of an optical soliton in an optical fiber is generally described by using a nonlinear Schrodinger equation, and for a one-dimensional situation, the dimensionless nonlinear Schrodinger equation after the normalized transformation is as follows:
Figure BDA0003325627020000062
in the equation, q represents light amplitude, t and x respectively refer to time and space parameters, i is a quantization coefficient, the second term on the left side is a dispersion effect, the third term Δ n refers to a nonlinear effect, and when the two effects are balanced, the time is as follows:
Figure BDA0003325627020000063
then there are:
Figure BDA0003325627020000064
that is, the light does not change with time during propagation, and optical solitons are generated.
Similarly, in the magnetic coupling resonance wireless power transfer structure, it may be configured that:
Figure BDA0003325627020000065
here, p is the wireless power transmission power, and α denotes various parameters of the magnetic coupling resonance wireless power transmission structure. Since the transmitted power is also related to a number of spatial variables, we have as a balancing goal that the circuit operates at the resonant frequency for simplicity of analysis. The conditions for the circuit to operate in the soliton state are:
Figure BDA0003325627020000066
similarly, the first term on the left side of the equal sign of the above formula is the dispersion effect of the resonant frequency, which is the inherent effect of the magnetic coupling resonant wireless power transmission structure. The second term is a nonlinear effect, the real-time control nonlinear power electronic converter is solved through the solitary wave solver, a corresponding nonlinear effect is generated to balance the dispersion effect of the resonant frequency, and the circuit can be operated in a high-efficiency solitary wave state. To reduce cost, the input to the soliton resolver may sample the primary current.
Firstly, the inherent dispersion effect of the magnetic coupling resonance wireless power transmission structure is solved. As shown in fig. 3, subscripts 1 and 2 denote a primary side loop (i.e., a transmission loop) and a secondary side loop (i.e., a reception loop) of the magnetically-coupled resonant wireless power transmission structure, respectively. R1、R2Indicating loop resistance, i.e. primary and secondary intrinsic resistance, RLRepresents the load resistance, L1、L1、2Representing coil inductance, C1、C2Representing resonant capacitance, M representing mutual inductance between two coils, u1、u2Representing the voltage across the capacitor, uinRepresenting the input voltage of the magnetically coupled resonant wireless power transfer structure. The system is modeled using a circuit model. Based on kirchhoff voltage circuits, the model can be expressed as:
Figure BDA0003325627020000071
three matrices are defined, respectively:
Figure BDA0003325627020000072
substitution can obtain:
Figure BDA0003325627020000073
wherein
Figure BDA0003325627020000074
The above equation is a standard differential equation form of a two-degree-of-freedom vibration system. When a two-freedom-degree vibration mechanical system is forced to vibrate, two undamped free vibration frequencies exist, and when the frequency of the driving external force is equal to the frequency, the amplitude of the forced vibration reaches the maximum value. And the natural frequency is the natural characteristic of the vibrating system and does not change with the system response. This can be manifested in the circuit as the frequency of the applied voltage being the same as the system natural frequency, so that the system response is maximized, at which point the system reaches a resonant state.
According to the vibration theory, the natural frequency, i.e. the resonance frequency, is expressed as:
Figure BDA0003325627020000075
the expression is the dispersion effect of the resonant frequency of the magnetic coupling resonant wireless power transmission structure, wherein the natural frequency of the circuit
Figure BDA0003325627020000076
Coefficient of coil coupling
Figure BDA0003325627020000077
And then constructing a corresponding time solitary wave state controller. Note the resonant frequency expression and the frequency of oscillation of the primary current
Figure BDA0003325627020000078
Similarly, therefore, using a zero-crossing comparator based on the transmit loop current as an isolated wave resolver, non-zero resultsThe linear effect has a certain balancing effect on the dispersion effect of the resonance frequency.
This model was simulated in the PSIM as shown in fig. 4 with the system parameters shown in table 1 below. Simulating the condition that the aging capacity of the capacitor is reduced, and sequentially making the resonant capacitor C in the experiment1、C2From CaIs changed into CbThen changed to Cc. As shown in fig. 5, fig. 6 is an FFT analysis chart corresponding to the result, and it can be found that when the resonant capacitance parameter changes, the oscillation frequency of the transmitting loop current changes, the frequency of the driving circuit generated by the soliton resolver also changes, a nonlinear effect is generated, the operating frequency of the circuit changes along with the dispersion rule of the resonant frequency, and the dispersion effect is balanced. Comparing the simulation results of the system without the time solitary wave state controller shown in fig. 7 under the same conditions, it can be known that the nonlinear effect has a certain balance effect on the dispersion effect of the resonant frequency, so that the circuit keeps operating with high efficiency.
Table 1: simulation system parameters
VDC/V L1,2/μH M/μF R1,2/Ω RL/Ω Ca/pF Cb/pF Cc/pF
20 60 5.65 1 27 790 395 197.5
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims (4)

1. A wireless power transmission system operating in a time soliton state, comprising: the wireless power transmission system comprises a nonlinear power electronic converter, a time solitary wave state controller and a magnetic coupling resonance wireless power transmission structure; the nonlinear power electronic converter generates high-frequency square wave alternating current according to the input of the time solitary wave state controller, and the high-frequency square wave alternating current is used as a power supply to drive the magnetic coupling resonance wireless power transmission structure to operate; the time solitary wave state controller consists of a sampling circuit, a solitary wave resolver and a driving circuit, wherein the sampling circuit is respectively connected with a primary side of the magnetic coupling resonance wireless power transmission structure and the solitary wave resolver, the solitary wave resolver is connected with the driving circuit, and the driving circuit is connected with an inverter circuit of the nonlinear power electronic converter and is used for driving the nonlinear power electronic converter; the solitary wave state controller samples the primary current of the magnetic coupling wireless power transmission structure, and according to the dispersion rule of the resonant frequency to each parameter of the structure, the solitary wave state controller generates a driving signal with corresponding frequency in real time after being solved by the solitary wave solver, so that the nonlinear effect of the nonlinear power electronic converter is balanced with the dispersion rule of the resonant frequency.
2. A wireless power transmission system operating in a time soliton state according to claim 1, wherein: the solitary wave resolver is a comparator, the sampling circuit samples the primary current of the magnetic coupling resonance wireless power transmission structure and inputs the primary current into a plus input end of the comparator, a minus input end of the comparator is grounded, the output of the comparator is amplified by a driving circuit and then drives an inverter circuit of a nonlinear power electronic converter, and the nonlinear power electronic converter is composed of a direct current voltage source (E) and a first switching tube (S)1) A second switch tube (S)2) And a third switching tube (S)3) And a fourth switching tube (S)4) The positive pole of the DC voltage source (E) is respectively connected with the first switch tube (S)1) And a third switching tube (S)3) The negative pole of the direct current voltage source (E) is respectively connected with a second switch tube (S)2) And a fourth switching tube (S)4) Connected, the first switching tube (S)1) And a second switch tube (S)2) Connected, the third switching tube (S)3) And a fourth switching tube (S)4) Connected, wherein the first switching tube (S)1) And a fourth switching tube (S)4) The driving current of (A) is in phase, the second switch tube (S)2) And a third switching tube (S)3) Are in phase.
3. A wireless power transmission system operating in a time soliton state according to claim 1, wherein: the magnetic coupling resonance wireless power transmission structure comprises a primary side compensation capacitor, a primary side coil, a primary side inherent resistance, a secondary side compensation capacitor, a secondary side coil, a secondary side inherent resistance and a load, wherein the primary side compensation capacitor, the primary side inherent resistance and the primary side coil are connected in series and then connected with two output ends of a nonlinear power electronic converter; the primary coil and the secondary coil of the magnetic coupling resonance wireless power transmission structure and the primary compensation capacitor and the secondary compensation capacitor respectively form a series resonance circuit which meets the requirement
Figure FDA0003325627010000021
Wherein L is1、L2Is the self-inductance value of the primary and secondary side coils, C1、C2The capacitance values of the primary and secondary compensation capacitors are used, and omega is the angular frequency of the system.
4. A control method of a wireless power transmission system operating in a time soliton state according to any one of claims 1 to 3, comprising the steps of:
1) according to the soliton wave theory, the conditions for the system to operate in the soliton wave state are set as follows:
Figure FDA0003325627010000022
first left item of equal sign
Figure FDA0003325627010000023
Alpha is a dispersion effect of the resonant frequency, and refers to various parameters of the magnetic coupling resonant wireless power transmission structure, which is an inherent effect of the magnetic coupling resonant wireless power transmission structure; the second term is a nonlinear effect, and delta n refers to the nonlinear effect of the nonlinear power electronic converter;
2) for the magnetic coupling resonance wireless power transmission structure, the output of the nonlinear power electronic converter is set as uinResonant capacitance C ═ C1＝C2The coil inductance L ═ L1＝L2Mutual inductance between coils is M, and load is RLThe loop resistance is R1、R2I.e. the inherent resistance of the primary side and the secondary side; the expression formula of the resonance frequency is obtained according to the kirchhoff voltage law and the mechanical vibration theory as follows:
Figure FDA0003325627010000024
the expression is a magnetic coupling resonance wireless power transmission junctionDispersion effect of structural resonance frequency, wherein circuit natural frequency
Figure FDA0003325627010000025
Coefficient of coil coupling
Figure FDA0003325627010000026
3) Sampling a primary side loop current of a magnetic coupling resonance wireless power transmission structure, controlling a nonlinear power electronic converter in real time through a time solitary wave state controller, and generating corresponding delta n omega to balance the dispersion effect of resonance frequency, namely enabling a system to keep a high-efficiency running solitary wave state; the constructed solitary wave resolver takes a dispersion rule capable of balancing the resonant frequency of the magnetic coupling resonance wireless power transmission structure as a standard.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014139287A1 (en) * 2013-03-12 2014-09-18 海尔集团公司 Wireless power transmission system adapted for multiload dynamic switching
WO2014176875A1 (en) * 2013-04-28 2014-11-06 海尔集团技术研发中心 Method and system fro wireless electric energy transmission
CN109436197A (en) * 2018-10-31 2019-03-08 中国海洋大学 Interior estimates act on coupled motions and the dynamometry experimental system for simulating of lower ocean floating structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014139287A1 (en) * 2013-03-12 2014-09-18 海尔集团公司 Wireless power transmission system adapted for multiload dynamic switching
WO2014176875A1 (en) * 2013-04-28 2014-11-06 海尔集团技术研发中心 Method and system fro wireless electric energy transmission
CN109436197A (en) * 2018-10-31 2019-03-08 中国海洋大学 Interior estimates act on coupled motions and the dynamometry experimental system for simulating of lower ocean floating structure

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