CN110829618A - Directional transmission system of multi-load wireless power transmission system - Google Patents
Directional transmission system of multi-load wireless power transmission system Download PDFInfo
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- CN110829618A CN110829618A CN201911008072.XA CN201911008072A CN110829618A CN 110829618 A CN110829618 A CN 110829618A CN 201911008072 A CN201911008072 A CN 201911008072A CN 110829618 A CN110829618 A CN 110829618A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 39
- 238000004891 communication Methods 0.000 claims abstract description 26
- 230000005611 electricity Effects 0.000 claims abstract description 20
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000012546 transfer Methods 0.000 claims abstract description 4
- 230000000739 chaotic effect Effects 0.000 claims description 7
- 238000013507 mapping Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 11
- 230000007246 mechanism Effects 0.000 description 8
- 230000005674 electromagnetic induction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
Abstract
The invention relates to a directional transmission system for a multi-load wireless electric energy transmission system, which is characterized in that: the system comprises a power supply unit and a power utilization unit, wherein the power supply unit is formed by mutually connecting a power supply circuit, a key generation unit and a wireless communication unit of a power supply unit, and the power utilization unit is formed by mutually connecting a resonance unit, a power receiving unit, a wireless communication unit of the power utilization unit, a key decoding unit and a capacitance adjusting unit; the power supply unit and the power consumption unit carry out energy transfer through electromagnetic coupling connection among the power supply circuit, the resonance unit and the power receiving unit; the power supply unit and the electricity consumption unit transmit the request signal and the key information through wireless communication connection between the wireless communication unit of the power supply unit and the wireless communication unit of the electricity consumption unit.
Description
Technical Field
The invention relates to a wireless charging technology, in particular to a directional transmission mechanism for a multi-load wireless power transmission system.
Background
Wireless charging technology is derived from wireless power transmission technology, which utilizes electromagnetic coupling, a power supply apparatus transmits electric energy to a consumer, which uses received energy to charge a battery while operating itself. Compared with the wired charging technology, the energy transmission does not need a distribution line, so that the power supply device is very suitable for supplying power to the mobile equipment. With the development of electric vehicles, mobile robots and the like, the demand for wireless charging is increasing. The wireless charging technology is mainly realized by electromagnetic induction charging, radio wave charging and magnetic resonance charging. The electromagnetic induction type charging principle is similar to the transformer principle, a primary coil is electrified with alternating current with a certain frequency, a secondary coil can generate certain current by using the electromagnetic induction principle, and the technology has the advantages of very short space transmission distance (mm level) and low transmission efficiency. The radio wave charging technology is a well-developed technology, similar to the early used ore radio, and mainly comprises a microwave transmitting device and a microwave receiving device, and can capture the radio wave energy rebounded from a wall, and maintain a stable direct current voltage while adjusting along with the load. The magnetic resonance type charging system consists of an energy transmitting device and an energy receiving device, when the two devices are adjusted to the same frequency or resonate at a specific frequency, the two devices can exchange energy with each other, the magnetic resonance type charging system is a technology which is currently researched, a research team of the institute of technology (MIT) of the Massachusetts of 2007 uses the technology to light a 60-watt bulb which is two meters away, compared with the electromagnetic induction type charging, the transmission distance and the efficiency of the magnetic resonance type charging system are obviously increased, and a new direction is opened for a wireless charging technology and a wireless power transmission technology.
The wireless charging system is oriented to a plurality of power consumption units, but no distribution line is used for defining legally authorized power consumption units, and a safety mechanism of power transmission of the wireless charging system is yet to be developed.
Disclosure of Invention
The invention aims to provide a directional transmission system for a multi-load wireless power transmission system, which realizes wireless power supply to authorized power utilization units, and simultaneously, unauthorized power utilization units cannot obtain effective power supply. The technical scheme is as follows:
a directional transmission system for a multi-load wireless power transmission system comprises a power supply unit and a power consumption unit, wherein the power supply unit is formed by mutually connecting a power supply circuit, a key generation unit and a wireless communication unit of a power supply unit, and the power consumption unit is formed by mutually connecting a resonance unit, a power receiving unit, a wireless communication unit of the power consumption unit, a key decoding unit and a capacitance adjusting unit; the power supply unit and the power consumption unit carry out energy transfer through electromagnetic coupling connection among the power supply circuit, the resonance unit and the power receiving unit; the power supply unit and the electricity consumption unit transmit the request signal and the key information through wireless communication connection between the wireless communication unit of the power supply unit and the wireless communication unit of the electricity consumption unit. The key generation unit of the power supply unit generates a key through a key function of the power supply unit and transmits the generated key to the wireless communication unit of the power supply unit in a wireless transmission mode; the power supply circuit adjusts the switching frequency according to the frequency corresponding to the key.
Further, the wireless communication unit of the electricity consumption unit transmits the key received from the power supply unit to the key decoding unit, the key decoding unit decodes the switching frequency of the power supply circuit according to the obtained key and transmits the key to the capacitance adjusting unit, and the capacitance adjusting unit adjusts the capacitance values of the resonance unit and the power receiving unit so that the natural frequencies of the resonance unit and the power receiving unit are the same as the obtained switching frequency.
The function used by the key generation unit is one of gaussian mapping or other chaotic functions.
The wireless charging system provided by the invention is based on the magnetic resonance coupling principle, and the charging efficiency is very sensitive to the frequency. The directional transmission of energy can be realized by processing the frequency change rule. The invention relates to a directional transmission mechanism aiming at a multi-load wireless power transmission system, which is characterized in that the frequency sensitivity of magnetic resonance coupling wireless charging is utilized, and the chaos function is used for processing the frequency change rule so as to realize the directional energy of wireless charging. The directional transmission mechanism for the multi-load wireless power transmission system has the advantages that wireless power supply to authorized power utilization units can be realized, and meanwhile, unauthorized power utilization units cannot obtain effective power supply. The results of the scale-down experiments show that: the supply voltage obtained by authorized electricity utilization units in the experiment is stabilized at about 10V, while the supply voltage obtained by unauthorized electricity utilization units in the experiment approaches 0V.
Drawings
Fig. 1 is a structural diagram of a directional transmission mechanism for a multi-load wireless power transmission system according to the present invention;
FIG. 2 is a bifurcation diagram of Gaussian mapping;
FIG. 3 is a graph showing the results of a downscaling experiment, wherein (a) is a voltage waveform of an authorized unit of electricity in the experiment, and (b) is a voltage waveform of an unauthorized unit of electricity in the experiment.
1. Power supply unit 2, electricity unit 3, power supply circuit 4, and resonance unit
5. Wireless communication unit of power receiving unit 6, key generation unit 7 and power supply unit
8. DC/AC converter 9, wireless communication unit 10 of electricity consumption unit, key decoding unit
11. Capacitance adjusting unit 12, voltage waveform of authorized electricity unit in experiment
13. Voltage waveform of unauthorized electricity unit in experiment
Detailed Description
The structure of the directional transmission mechanism for the multi-load wireless power transmission system of the present invention is described with reference to the accompanying drawings.
Fig. 1 shows an overall structure of a directional transmission mechanism for a multi-load wireless power transmission system according to the present invention. The directional transmission mechanism for the multi-load wireless power transmission system comprises a power supply unit 1 and a power utilization unit 2, wherein the power supply unit 1 is composed of a power supply circuit 4, a secret key generation unit 6 and a wireless communication unit 7 of a power supply unit, and the power utilization unit 2 is composed of a resonance unit 5, a power receiving unit 6, a wireless communication unit 10 of a power utilization unit, a secret key decoding unit 11 and a capacitance adjusting unit 12.
The wireless charging system of the present invention relies on the magnetic resonance coupling principle. The power supply circuit 4, the resonance unit 5, and the power receiving unit 6 constitute a wireless charging integrated circuit based on the magnetic resonance coupling principle, and energy transfer is achieved therebetween by the principle of electromagnetic induction. Only when the natural frequencies of the resonance unit 4 and the power receiving unit 5 are equal to the switching frequency ω of the power supply circuit 30The maximum transmission energy can be obtained with the same electrical unit 2. Namely:
the power supply unit 1 continuously adjusts the key through the key generation unit 6 according to a certain chaotic function, and the DC/AC converter 8 adjusts the switching frequency of the power supply circuit 3 according to the frequency corresponding to the key to wait for the power supply request of the power unit 2. When the power unit 2 needs power supply due to insufficient power, the wireless communication unit 9 of the power unit sends a power supply request to the power supply unit 1, the wireless communication unit 8 of the power supply unit receives the power supply request and sends a key to the power unit 1, and after the wireless communication unit 9 of the power unit receives the key, the key decoding unit 11 obtains the switching frequency omega of the power supply unit 10The capacitance C of the resonance unit 4 is adjusted by the capacitance adjusting unit 122And a capacitance C of the power receiving unit 53So that its natural frequency is equal to ω0Matched to obtain maximum transmitted energy.
The above power supply process is performed on the premise that the electricity consumption unit 2 is an authorized electricity consumption unit, i.e., the key decoding unit 10 thereof matches the key generation unit 5 of the power supply unit 1. an unauthorized electricity consumption unit lacks information of key generation of the power supply unit 1, and ω cannot obtain ω0And thus an effective power supply cannot be obtained.
Fig. 2 shows a bifurcation diagram of gaussian mapping. Gaussian mapping is a chaotic function. It is a one-bit non-linear iterative mapping, which can be described by the formula:
xn+1＝exp(-αxn 2)+β
wherein α is the adjustment parameter of chaotic oscillation amplitude, β is the bifurcation parameter, FIG. 2 shows that when α is 6.2, β changes from-0.7 to-0.3, xnThe sequence is in chaotic oscillation in the interval of (-0.3, 0.7). Thus using (0.8+ x)n) The key mu is set while the switching frequency omega can be at (0.5 omega)0,1.5ω0) The interval chaotic regulation is according to the following formula:
ω＝μω0
this realizes unpredictable adjustment of the frequency, and the electricity consumption unit without the key generation information cannot obtain the optimum frequency and cannot obtain efficient power supply.
FIG. 3 is the results of a downscaling experiment of the invention, wherein the abscissa represents 1s per interval and the ordinate represents 5V per interval. It can be seen that the voltage waveform 12 of authorized power units in the experiment is stable at about 10V, while the voltage waveform 13 of unauthorized power units in the experiment has an amplitude of almost 0.
Claims (3)
1. A directional transmission system for a multi-load wireless power transmission system is characterized in that: the system comprises a power supply unit and a power utilization unit, wherein the power supply unit is formed by mutually connecting a power supply circuit, a key generation unit and a wireless communication unit of a power supply unit, and the power utilization unit is formed by mutually connecting a resonance unit, a power receiving unit, a wireless communication unit of the power utilization unit, a key decoding unit and a capacitance adjusting unit; the power supply unit and the power consumption unit carry out energy transfer through electromagnetic coupling connection among the power supply circuit, the resonance unit and the power receiving unit; the power supply unit and the electricity consumption unit transmit the request signal and the key information through wireless communication connection between the wireless communication unit of the power supply unit and the wireless communication unit of the electricity consumption unit. The key generation unit of the power supply unit generates a key through a key function of the power supply unit and transmits the generated key to the wireless communication unit of the power supply unit in a wireless transmission mode; the power supply circuit adjusts the switching frequency according to the frequency corresponding to the key.
2. A directional transmission system according to claim 1, wherein: the wireless communication unit of the electricity consumption unit transmits the key received from the power supply unit to the key decoding unit, the key decoding unit decodes the switching frequency of the power supply circuit according to the obtained key and transmits the key to the capacitance adjusting unit, and the capacitance adjusting unit adjusts the capacitance values of the resonance unit and the power receiving unit so that the inherent frequencies of the resonance unit and the power receiving unit are the same as the obtained switching frequency.
3. A directional transmission system according to claim 1, wherein: the function used by the key generation unit is one of gaussian mapping or other chaotic functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008072.XA CN110829618A (en) | 2019-10-22 | 2019-10-22 | Directional transmission system of multi-load wireless power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911008072.XA CN110829618A (en) | 2019-10-22 | 2019-10-22 | Directional transmission system of multi-load wireless power transmission system |
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| CN110829618A true CN110829618A (en) | 2020-02-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795154A (en) * | 2013-11-22 | 2014-05-14 | 西南交通大学 | Load legitimacy determination method of inductive wireless electric energy transmission system |
| CN104617680A (en) * | 2015-01-20 | 2015-05-13 | 天津大学 | Energy encrypting based magnetic resonance coupling type wireless charging system |
| CN105207373A (en) * | 2015-09-09 | 2015-12-30 | 天津大学 | Magnetic resonance coupling wireless charging system based on photoelectric encryption |
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- 2019-10-22 CN CN201911008072.XA patent/CN110829618A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795154A (en) * | 2013-11-22 | 2014-05-14 | 西南交通大学 | Load legitimacy determination method of inductive wireless electric energy transmission system |
| CN104617680A (en) * | 2015-01-20 | 2015-05-13 | 天津大学 | Energy encrypting based magnetic resonance coupling type wireless charging system |
| CN105207373A (en) * | 2015-09-09 | 2015-12-30 | 天津大学 | Magnetic resonance coupling wireless charging system based on photoelectric encryption |
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Application publication date: 20200221 |