CN103312052A - Antenna device for wireless power supply system - Google Patents
Antenna device for wireless power supply system Download PDFInfo
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- CN103312052A CN103312052A CN2013102846975A CN201310284697A CN103312052A CN 103312052 A CN103312052 A CN 103312052A CN 2013102846975 A CN2013102846975 A CN 2013102846975A CN 201310284697 A CN201310284697 A CN 201310284697A CN 103312052 A CN103312052 A CN 103312052A
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Abstract
The invention discloses an antenna device for a wireless power supply system. The antenna device comprises a transmitting device and a receiving device, wherein the transmitting device comprises a high-frequency power supply and a transmitting antenna, the high-frequency power supply is an oscillating circuit composed of an oscillating coil and an equivalent oscillating capacitor, the transmitting antenna is a series loop composed of a transmitting coil and a transmitting compensating capacitor, the receiving device comprises a receiving antenna and an induction coil, the receiving antenna is a series loop composed of a receiving coil and a receiving compensating capacitor, the induction coil is coupled with the receiving coil, the high-frequency power supply of the transmitting device generates fixed-frequency high-frequency voltage and is used for driving the transmitting antenna, and the high-frequency voltage is converted into electromagnetic energy via the transmitting antenna to be transmitted in a space. The receiving device is used for receiving the electromagnetic energy in the space and converting the electromagnetic energy into available alternating-current or direct-current electricity. The induction coil is used for transmitting energy received by the receiving antenna to a load by means of inductive coupling. The antenna device can solve the problems in antenna design in a wireless transmission system and can improve energy transmission efficiency.
Description
Technical field
The present invention relates to the wireless power technology, especially relate to the antenna assembly that utilizes the magnetic coupling harmonic technology to realize the wireless power supply system of wireless power.
Background technology
The transmission of tradition electric energy mainly utilizes the direct contact of plain conductor to carry out, and this has brought many inconvenience to us.And wireless power transmission is just different, and electric energy is contactless from the transmitting terminal to the receiving terminal, has improved the flexibility of power consumption equipment acquisition electric energy.In addition, the wireless power transmission technology also has the advantages such as wireless connections, safety, capable of dynamic continued power, and especially in special and adverse circumstances, as giving mobile power supply equipment, high pressure, inflammable, explosive occasion wait to be widely used under water.Especially in the epoch of energy scarcity, utilizing the inexhaustible eco-friendly power source of space---solar energy is first-selected.
The wireless power transmission technology will change traditional delivery of electrical energy mode, be subject to international extensive concern, and at present commonly used have three class methods, i.e. induction, electromagentic resonance formula and electromagnetic radiation formula wireless power transmission.The present invention mainly concentrates in the research of electromagentic resonance formula, namely utilizes the magnetic coupling harmonic technology, and when the natural frequency of the oscillating magnetic field frequency of power supply transmitting terminal and receiving terminal was identical, receiving terminal just produced resonance, thereby realizes the wireless transmission of energy.In the magnetic coupling harmonic technology, the antenna of transmitting terminal and receiving terminal has been calibrated for a magnetic resonance system, can be with fixing frequency vibration after the energising.Energy Transfer is not subjected to spatial obstacle thing (non magnetic) impact, can see thus, and efficiency of transmission is relevant with the diameter of transmission, received energy unit, transmits area larger, and efficiency of transmission is higher; Laser propagation effect and frequency and antenna size are in close relations.Antenna assembly is the key component in the wireless power transmission technology, relates to emission and the reception of energy.The properties influence of antenna is to the transmission performance of whole system, also is the basis of researching and analysing whole wireless transmitting system for the analysis of antenna.At present during Antenna Design for simplified design, generally transmitting coil and receiving coil are designed to identical parameters, cause the receiving terminal size larger, increased the equiva lent impedance loss of receiving terminal antenna, and the space scattering loss between the coil, be easy to cause the reduction of efficiency of transmission, in addition, the selection of coil q adopting parameters and electric capacity topology also is that Antenna Design is the problem that should be noted that.
Summary of the invention
The invention provides a kind of antenna assembly for wireless power supply system, solved the energy loss problem that occurs in the Antenna Design in the present wireless transmitting system, improve energy transmission efficiency.
For achieving the above object, the present invention adopts following technical scheme:
A kind of antenna assembly for wireless power supply system comprises dispensing device and receiving system:
Dispensing device comprises high frequency electric source and transmitting antenna, and high frequency electric source is the oscillation circuit that oscillator coil and equivalent oscillating capacitor form, and transmitting antenna is transmitting coil and the series loop of launching the compensation condenser composition, and oscillator coil and transmitting coil are of coupled connections;
Receiving system comprises reception antenna and induction coil, and reception antenna is receiving coil and the series loop that receives the compensation condenser composition, and induction coil and receiving coil are of coupled connections, and are connected in series with external loading; Reception antenna is consistent with the transmitting antenna self-resonant frequency.
The inductance of receiving coil, winding method, the number of turn are different from inductance, winding method, the number of turn of transmitting coil, receive the compensation condenser capacitance and to launch the compensation condenser capacitance different.
Wherein the winding method of receiving coil, the number of turn and receiving coil reach definite number of turn according to the different winding method of the conditional requests such as the size employing of different occasions in the reception antenna, such as when volume is restricted, adopting the snail coiling, allow to adopt the spatially spiral winding method in the space; Then according to reception antenna and the transmitting antenna self-resonant frequency consistency principle, carry out the compensation of different appearance values to receiving compensation condenser in the reception antenna from the emission compensation condenser, thereby improve the receiving coil utilance.
The high frequency voltage of dispensing device medium-high frequency power generation fixed frequency, in order to drive transmitting antenna, the conversion of process transmitting antenna is converted to electromagnetic energy with high-frequency electrical and transmits in the space.Receiving system is used for receiving the electromagnetic energy in space, and is converted into available interchange or direct current, and the energy that induction coil utilization induction coupling receives reception antenna is delivered to load.
Further, in order to realize effective transmission in magnetic field under the near field, farthest improve the aggregation of transmitting energy, should improve as much as possible resonance frequency, while is also considered the factors such as switching frequency during the existing high-power electric and electronic, resonance frequency is difficult for too high, so transmitting antenna and reception antenna self-resonant frequency scope are 1MHz～50MHz.
Further, for guaranteeing that receiving system is in the near-field region transmitting antenna of the electromagnetic field that dispensing device produces and the distance between the reception antenna
Wherein, λ is the transmission antennas transmit electromagnetic wavelength.
Further, the high frequency electric source in the emitter adopts Colpitts oscillation circuit.
Further, the compensation condenser of transmitting antenna and receiving coil all adopts the building-out capacitor mode that adds.
Further, according to resonance theory, the present invention is faint coupled system, so transmitting antenna and reception antenna quality factor q〉〉 1/k, wherein k is the coupling coefficient between transmitting coil and the receiving coil.
Further, rule of thumb, the coupling coefficient k between transmitting coil and the receiving coil＜0.05.
Beneficial effect: (1) the present invention takes the inconsistent design of parameter of transmitting coil and receiving coil, can further solve the design problem of existing radio energy transmission system transmit antenna parameter, improves efficiency of transmission; (2) under the alternative condition that satisfies coil q parameter of the present invention and electric capacity topology, as long as guarantee that the self-resonant frequency of two coils is consistent, and satisfy the Q value and choose condition, such as the Energy Transfer occasion at the multi-load Sensor Network, according to design of the present invention, can design the larger-size transmitting antenna of a cover, reception antenna then can be according to the size design size of load, effectively utilize the space, having solved existing Energy Transfer, to transmit and receive the antenna size parameter consistent, cause connecing that to penetrate antenna size excessive, the problem that utilance is lower, realize effective transmission of energy, improve laser propagation effect.
Description of drawings
Fig. 1 is antenna device arrangement schematic diagram of the present invention.
Fig. 2 is the aerial coil schematic diagram.
Fig. 3 is dispensing device equivalent circuit diagram of the present invention.
Fig. 4 is receiving system equivalent circuit diagram of the present invention.
Fig. 5 is the resonance curve of antenna when having the different Q value.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in Figure 1, the present invention includes a dispensing device and receiving system, wherein dispensing device comprises high frequency electric source 1 and transmitting antenna 2, high frequency electric source 1 is the oscillation circuit that oscillator coil 3 and equivalent oscillating capacitor 4 form, and this oscillation circuit is Colpitts oscillation circuit; Transmitting antenna 2 is transmitting coil 5 and the series loop of launching compensation condenser 6 compositions, and oscillator coil 3 is of coupled connections with transmitting coil 5, and emission compensation condenser 6 adopts the building-out capacitor mode that adds.
Receiving system comprises reception antenna 7 and induction coil 8, and reception antenna 7 is receiving coil 9 and the series loop that receives compensation condenser 10 compositions, and induction coil 8 is of coupled connections with receiving coil 9, and is connected in series with external loading 11; By adjusting receiving coil 9 and receiving compensation condenser 10, make reception antenna 7 consistent with transmitting antenna 2 self-resonant frequencies.
In addition, the inductance of receiving coil 9, winding method, the number of turn are different from inductance, winding method, the number of turn of transmitting coil 5, receive compensation condenser 10 capacitances and to launch compensation condenser 6 capacitances different.
Dispensing device equivalent circuit diagram of the present invention as shown in Figure 3, dispensing device medium-high frequency power supply 1 produces the high frequency voltage of fixed frequency, in order to driving transmitting antenna 2, through the conversion of transmitting antenna 2 high-frequency electrical is converted to electromagnetic energy and transmits in the space.The dispensing device equivalent circuit diagram as shown in Figure 4, receiving system receives the electromagnetic energy in spaces with reception antenna 7, and is converted into available interchange or direct current, the energy that induction coil 3 utilizes the induction coupling that reception antenna 7 is received is delivered to external loading 11.
Antenna assembly is the important component part that consists of wireless power supply system, and the wireless transmission of wireless power supply system energy mainly needs transmitting antenna and reception antenna, so each parameter of antenna can directly have influence on the Energy Transfer effect.The aerial coil schematic diagram as shown in Figure 2, the design of antenna is whole antenna assembly part and parcel, wherein the self-resonant frequency of transmitting antenna is by following formula calculative determination:
L wherein
1Be transmitting coil self inductance, C
1Be emission building-out capacitor value.
In order to realize effective transmission in magnetic field under the near field, farthest improve the aggregation of transmitting energy, should improve as much as possible resonance frequency, the ordinary circumstance lower frequency is more than megahertz, while is also considered the factors such as switching frequency during the existing high-power electric and electronic, resonance frequency is difficult for too high, otherwise be difficult to realize, the inversion of power unit, therefore, we determine that by appropriate design transmitting coil 5 and emission compensation condenser 6 the self-resonant frequency scope of transmitting antenna 2 is between 1MHz～50MHz.
The winding method of receiving coil, the number of turn and receiving coil adopt different winding methods and select the number of turn according to the conditional requests such as size of different occasions in the reception antenna 7, finally according to reception antenna and the transmitting antenna self-resonant frequency consistency principle, carry out the compensation of different appearance values to receiving compensation condenser in the reception antenna from the emission compensation condenser; For example can adopt the winding method of spatially spiral at transmitting antenna, the number of turn 5 circles, and be subjected to volume restrictions receiving terminal antenna can adopt snail design, the number of turn is 3 circles, different resulting inductance value according to the number of turn is also different, according to the consistent principle of resonance frequency, can obtain receiving compensation condenser and the compensation appearance value of launching compensation condenser in the reception antenna, thereby realize the resonance between two coils.
In addition, transmitting antenna 2 and reception antenna 7 all have higher quality factor q value, according to resonance theory, the faint coupled system of this system, Q should be much larger than 1/k, and k is the coupling coefficient between transmitting coil and the receiving coil, for so that system can reach the resonance steady operation, rule of thumb be worth Q〉20, k＜0.05, k is less, as shown in Figure 5, Q value resonance curve is more sharp-pointed, and Energy Transfer is more effective.
For guaranteeing that receiving system is in the near-field region of the electromagnetic field of transmitting antenna 2 generations, distance is between transmitting antenna and the reception antenna
Wherein, λ is the transmission antennas transmit electromagnetic wavelength.
It below is the specific embodiment of the present invention, send coil parameter in the present embodiment: radius is 30 centimetres, adopt the spatially spiral winding, the number of turn is 3 circles, and resonance work is 3MHz frequently, the receiving coil parameter: radius is 10 centimetres, adopt the snail winding, the number of turn is 6 circles, and resonance work is 3MHz frequently, and quality factor q is 100.Coupling coefficient k is 0.01 in addition, and efficiency of transmission is 65% as calculated.If employing is designed to transmitting coil and receiving coil the mode of identical parameters, efficiency of transmission is about 52%.As seen from the above, laser propagation effect of the present invention is higher, has better practicality.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. antenna assembly that is used for wireless power supply system is characterized in that comprising:
Dispensing device, comprise high frequency electric source and transmitting antenna, described high frequency electric source is the oscillation circuit that oscillator coil and equivalent oscillating capacitor form, and described transmitting antenna is transmitting coil and the series loop of launching the compensation condenser composition, and described oscillator coil and transmitting coil are of coupled connections;
Receiving system comprises reception antenna and induction coil, and described reception antenna is receiving coil and the series loop that receives the compensation condenser composition, and described induction coil and receiving coil are of coupled connections, and are connected in series with external loading; Described reception antenna is consistent with the transmitting antenna self-resonant frequency;
The inductance of described receiving coil, winding method, the number of turn are different from inductance, winding method, the number of turn of transmitting coil, and described reception compensation condenser capacitance is different from emission compensation condenser capacitance.
2. a kind of antenna assembly for wireless power supply system according to claim 1, it is characterized in that: described transmitting antenna and reception antenna self-resonant frequency scope are 1MHz～50MHz.
3. a kind of antenna assembly for wireless power supply system according to claim 1 is characterized in that: the distance between described transmitting antenna and the reception antenna
Wherein, λ is the transmission antennas transmit electromagnetic wavelength.
4. a kind of antenna assembly for wireless power supply system according to claim 1 is characterized in that: described high frequency electric source employing Colpitts oscillation circuit.
5. a kind of antenna assembly for wireless power supply system according to claim 1, it is characterized in that: the compensation condenser of described transmitting antenna and reception antenna all adopts the building-out capacitor mode that adds.
6. a kind of antenna assembly for wireless power supply system according to claim 1 is characterized in that: described transmitting antenna and reception antenna quality factor q〉〉 1/k,, wherein k is the coupling coefficient between transmitting coil and the receiving coil.
7. a kind of antenna assembly for wireless power supply system according to claim 7 is characterized in that: the coupling coefficient k between described transmitting coil and the receiving coil＜0.05.
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| CN201310284697.5A CN103312052B (en) | 2013-07-08 | 2013-07-08 | A kind of antenna assembly for wireless power supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103915916A (en) * | 2014-04-23 | 2014-07-09 | 慈溪市源顺光电科技有限公司 | Magnetic resonance wireless electric energy transmitting device based on planar magnetic resonant coupling coil structure |
| CN106463228A (en) * | 2014-03-28 | 2017-02-22 | 迪睿合株式会社 | Wireless power supply antenna system and electronic device |
| CN107690103A (en) * | 2017-09-29 | 2018-02-13 | 桂林电子科技大学 | A kind of headphone for supporting wireless charging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106463228A (en) * | 2014-03-28 | 2017-02-22 | 迪睿合株式会社 | Wireless power supply antenna system and electronic device |
| CN103915916A (en) * | 2014-04-23 | 2014-07-09 | 慈溪市源顺光电科技有限公司 | Magnetic resonance wireless electric energy transmitting device based on planar magnetic resonant coupling coil structure |
| CN107690103A (en) * | 2017-09-29 | 2018-02-13 | 桂林电子科技大学 | A kind of headphone for supporting wireless charging |
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| CN103312052B (en) | 2015-08-05 |
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