CN108092417A - Wireless charging device and control method thereof - Google Patents
Wireless charging device and control method thereof Download PDFInfo
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- CN108092417A CN108092417A CN201711421135.5A CN201711421135A CN108092417A CN 108092417 A CN108092417 A CN 108092417A CN 201711421135 A CN201711421135 A CN 201711421135A CN 108092417 A CN108092417 A CN 108092417A
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H02J7/025—
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a wireless charging device and a control method thereof, wherein the device comprises: a transmitting end (10) and a receiving end (20); wherein the transmitting end (10) comprises: a transmitting coil group formed of three or more transmitting coils; the transmitting coil group is used for forming a uniform transmitting field and transmitting an electromagnetic signal in the transmitting field; and the receiving end (20) is used for receiving the electromagnetic signal in the receiving range of the transmitting field and converting the electromagnetic signal into an electric signal required by a load to be charged. The scheme of the invention can overcome the defects of inconvenient charging, inconvenient use, poor user experience and the like in the prior art, and has the beneficial effects of convenient charging, convenient use and good user experience.
Description
Technical Field
The invention belongs to the technical field of wireless charging, particularly relates to a wireless charging device and a control method thereof, and particularly relates to an omnibearing non-contact wireless charging device and a control method thereof.
Background
Wireless power transmission, also known as wireless power transmission or non-contact power transmission, refers to converting electric energy into relay energy of other forms (such as electromagnetic field energy, laser, microwave, mechanical wave, etc.) by a transmitter, transmitting the relay energy for a certain distance, and converting the relay energy into electric energy by a receiver to realize wireless power transmission. Nowadays, Wireless Power transmission technology is developed vigorously, and practical products such as Qi (Wireless charging alliance, Wireless Power Consortium) standard, the first organization to promote Wireless charging technology, have appeared.
The existing products close to practical use still need to place electrical appliances (such as mobile phones, PAD and other mobile terminals) on a charger to be charged. Although the use of a charging cable is avoided, the appliance must still be placed in a defined position to enable charging, in which case the device becomes no longer "mobile".
In the prior art, the charging device has the defects of inconvenience in charging, inconvenience in use, poor user experience and the like.
Disclosure of Invention
The invention aims to solve the defects and provide a wireless charging device and a control method thereof, so as to solve the problem of charging inconvenience caused by the fact that an electric appliance needs to be placed on a charger in the prior art, and achieve the effect of improving charging convenience.
The present invention provides a wireless charging device, including: a transmitting end and a receiving end; wherein, the transmitting terminal includes: a transmitting coil group formed of three or more transmitting coils; the transmitting coil group is used for forming a uniform transmitting field and transmitting an electromagnetic signal in the transmitting field; and the receiving end is used for receiving the electromagnetic signal in the receiving range of the transmitting field and converting the electromagnetic signal into an electric signal required by the load to be charged.
Optionally, the transmit coil assembly comprises: three transmitting coils; and every two of the three transmitting coils are arranged orthogonally, and the transmitting field of an inside-to-outside transmitting type is formed in an orthogonal feed magnetic coupling resonance mode.
Optionally, wherein, when the transmitting coil set includes three transmitting coils, the receiving range includes: the radius is around the circle of the set value; and/or alternating current with same frequency and orthogonal phase is applied to the three transmitting coils, so that the three transmitting coils form three orthogonal coils.
Optionally, the transmit coil assembly comprises: four transmitting coils; the four transmitting coils form the transmitting field of an outside-in transmitting type by adopting a space magnetic field structure distributed by S-N-S-N polar coils.
Optionally, wherein, when the transmitting coil set includes four transmitting coils, the receiving range includes: the area enclosed by the four coils; and/or, the spatial magnetic field structure comprises: among the four transmitting coils, a first pair of coils which are opposite to each other are electrified with excitation current with set phase, and a second pair of coils which are opposite to each other are electrified with excitation current with opposite phase of the set phase.
Optionally, wherein in the magnetic field formed by the first pair of coils, pole S is located within the region enclosed by the four coils; in the magnetic field formed by the second pair of coils, pole N is located in the area enclosed by the four coils.
Optionally, the transmitting end further includes: an excitation circuit; the excitation circuit includes: an excitation source and a transmission capacitor; the number of the excitation circuits is consistent with that of the transmitting coils in the transmitting coil group; each excitation circuit and the corresponding transmitting coil form a transmitting loop.
Optionally, the excitation source comprises: a crystal oscillator and a radio frequency power amplifier; when the transmitting coil set comprises three transmitting coils, the excitation source further comprises: an LC quadrature phase shifter; when the transmitting coil group comprises three transmitting coils, the crystal oscillator, the LC quadrature phase shifter and the radio frequency power amplifier are sequentially connected into the corresponding transmitting loop; or, when the transmitting coil group comprises four transmitting coils, the crystal oscillator and the radio frequency power amplifier are sequentially connected to the corresponding transmitting loop.
Optionally, when the transmitting coil set includes three transmitting coils, the three transmitting coils correspond to the same crystal oscillator and the same LC quadrature phase shifter; the three excitation sources corresponding to the three transmitting coils are realized in a mode that the same crystal oscillator generates oscillation frequency, the same LC quadrature phase shifter provides phase shift, and then the three excitation sources are respectively connected with corresponding radio frequency power amplifiers.
Optionally, the receiving end includes: a receiving coil and a receiving capacitor; the receiving coil, the receiving capacitor and the load to be charged form a receiving loop; and/or the number of the receiving ends is more than one; the transmitting terminal can charge more than one receiving terminal in a one-to-many manner; and/or the electromagnetic signal received by the receiving end comprises: and the comprehensive electromagnetic signal transmitted by the transmitting coil group.
Optionally, the receiving end further includes: a receiving end rectifier and a DC/DC module; the receiving end rectifier and the DC/DC module are sequentially arranged between the receiving coil and a load to be charged or between the receiving capacitor and the load to be charged.
In another aspect, the present invention provides a method for controlling a wireless charging device, including: forming a uniform transmitting field through a transmitting coil group formed by more than three transmitting coils, and transmitting an electromagnetic signal in the transmitting field; and in the receiving range of the transmitting field, receiving the electromagnetic signal and converting the electromagnetic signal into an electric signal required by the load to be charged.
Optionally, the forming of the uniform transmission field by a transmission coil group formed by three or more transmission coils includes: forming the transmitting field of an inside-out transmitting type in a mode of magnetic coupling resonance through orthogonal feed by enabling every two transmitting coils of the three transmitting coils to be arranged orthogonally; or, the four transmitting coils adopt a space magnetic field structure distributed by S-N-S-N polar coils to form the transmitting field of an outside-in transmitting type.
Optionally, wherein, when the transmitting coil set includes three transmitting coils, the receiving range includes: the radius is around the circle of the set value; and/or alternating current with same frequency and orthogonal phase is conducted in the three transmitting coils, so that the three transmitting coils form three orthogonal coils; or, when the transmitting coil set includes four transmitting coils, the receiving range includes: the area enclosed by the four coils; and/or, the spatial magnetic field structure comprises: among the four transmitting coils, a first pair of coils which are opposite to each other are electrified with excitation current with set phase, and a second pair of coils which are opposite to each other are electrified with excitation current with opposite phase of the set phase.
According to the scheme, the uniform transmitting field is formed by the plurality of transmitting coils, so that omnibearing non-contact type electric energy transmission can be realized, and mobile wireless charging can be flexibly, safely and conveniently realized.
Furthermore, according to the scheme of the invention, a uniform transmitting field is formed by a plurality of transmitting coils, the traditional contact type and unidirectional wireless charging coil positioning is not needed, and the one-to-many real-time charging can be realized.
Therefore, according to the scheme provided by the invention, the uniform transmitting field is formed by the plurality of transmitting coils so as to realize non-contact charging, and the problem of charging inconvenience caused by the fact that the electric appliance needs to be placed on the charger in the prior art is solved, so that the defects of charging inconvenience, use inconvenience and poor user experience in the prior art are overcome, and the beneficial effects of charging convenience, use convenience and good user experience are realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic front view of a quadrature transmitting coil and a receiving coil of a wireless charging device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wireless power transmission circuit in a wireless charging device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wireless power supply area in a wireless charging device according to an embodiment of the invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
10-a transmitting end; 20-the receiving end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, a wireless charging device is provided, as shown in fig. 1, which is a schematic structural diagram of an embodiment of the wireless charging device of the present invention. The wireless charging apparatus may include: a transmitting end 10 and a receiving end 20.
In an optional example, the transmitting end 10 may include: a transmitting coil group formed by more than three transmitting coils. The transmitting coil assembly can be used for forming a uniform transmitting field and transmitting electromagnetic signals in the transmitting field.
For example: the second scheme shown in fig. 3 and the first scheme shown in fig. 1 and 2 have the same point that a plurality of excitation coils form a uniform field to realize one-to-many charging.
Optionally, the transmitting coil set may include: three transmitting coils.
And in the three transmitting coils, every two transmitting coils are arranged orthogonally, and the transmitting field of an inside-to-outside transmitting type is formed in an orthogonal feed magnetic coupling resonance mode.
For example: referring to the example shown in fig. 1, when the magnetic field generated by the transmitting coil is perpendicular to the receiving coil, the transmission efficiency reaches a maximum value; on the contrary, when the magnetic field generated by the transmitting coil is parallel to the receiving coil, i.e. the transmitting coil is perpendicular to the receiving coil, the transmission efficiency is the minimum.
Therefore, three orthogonal coils are formed through the three orthogonal transmitting coils, a uniform transmitting field can be formed, and the device is high in reliability and good in charging convenience.
More optionally, when the transmitting coil set may include three transmitting coils, the receiving range may include: the radius is around the circle of the set value.
For example: when the receiving coil is positioned at any position away from the origin of coordinates (circle with radius of R), the orthogonal transmitting resonance coil and the receiving coil system can be coupled and transferred with magnetic field energy in an omnibearing way.
For example: the orthogonal arrangement of the three coils is completely considered based on the formation of an omnidirectional transmitting field, when an orthogonal feed magnetic coupling resonant wireless energy transmission scheme is adopted, the direction vector of a magnetic field changes along with time, the rotation is periodically from 0 degrees to 360 degrees, and the change quantity of the energy transmission efficiency relative to the angle change of a receiving coil is minimum.
For example: when the receiving coil is shifted in position on the circumference with the radius of R, the pairing transmission relationship between the three transmitting coils and the receiving coil does not need to be shifted, the orthogonal arrangement of the transmitting coils is considered based on the consideration, the orthogonal arrangement can form a uniform field, and when the receiving coil is shifted in position on the circumference with the radius of R or a plurality of receiving coils are distributed on the circumference with the radius of R, the transmission efficiency is slightly changed.
The distance between the receiving coil and the origin of coordinates may be a range in which wireless charging is implemented. This range is typically several tens of centimeters, related to parameters such as resonant frequency, wire radius, coil radius, number of coil turns, electrical conductivity, and load resistance.
For example: the first embodiment of fig. 1 and 2 is around a circle of radius R.
From this, use the receiving range that the circumference encloses through forming with the settlement radius, can realize removing and charge, can also realize charging one to many for it is more convenient to charge, and can guarantee normal use, is favorable to promoting user experience.
More optionally, alternating currents with the same frequency and orthogonal phases are applied to the three transmitting coils, so that the three transmitting coils form three orthogonal coils.
For example: the transmitting coil shown in fig. 1 uses three orthogonal coils, which are supplied with alternating current of the same frequency and receiving coils (only 1 is shown in fig. 1).
For example: the same frequency means that the orthogonal coils (namely the transmitting coils) are electrified with alternating current with the same frequency, and the phases are orthogonal.
Therefore, the three transmitting coils are electrified with the same-frequency alternating current, so that the uniformity of a formed transmitting field is more facilitated, and the charging accuracy and reliability can be improved.
Optionally, the transmitting coil set may include: four transmitting coils.
The four transmitting coils form the transmitting field of an outside-in transmitting type by adopting a space magnetic field structure distributed by S-N-S-N polar coils.
For example: in the wireless power supply area shown in fig. 3, four coils at the periphery are excitation coils, and a receiving coil at the inner part is placed in the area. A space magnetic field structure distributed by S-N-S-N polar coils is adopted. The scheme can be applied to wireless power provided in various places such as airports, stations and hotels, and can be used in some special occasions such as the fields of power transmission problems of human body implantation instruments such as cardiac pacemakers and new energy electric vehicles.
For example: the four coils are arranged by adopting a space magnetic field structure distributed by S-N-S-N polar coils.
From this, form even transmitting field through four transmitting coil, can realize the wireless contactless charging in wider space, and the convenience of charging is good, and user experience is better.
More optionally, when the transmitting coil set may include four transmitting coils, the receiving range may include: the area enclosed by the four coils.
For example: in the second embodiment of fig. 3, the area is enclosed by four coils.
Therefore, wireless charging is carried out in the area surrounded by the four transmitting coils, the charging mode is simple and convenient, and the charging reliability is high.
More optionally, the spatial magnetic field structure may include: among the four transmitting coils, a first pair of coils which are opposite to each other are electrified with excitation current with set phase, and a second pair of coils which are opposite to each other are electrified with excitation current with opposite phase of the set phase.
For example: two coils opposite to each other are electrified with excitation current, S poles of the coils are in the area enclosed by the four coils, and the other two coils opposite to each other are electrified with opposite-phase excitation current, N poles of the coils are in the area enclosed by the four coils, namely, the space magnetic field structure distributed by the coils with S-N-S-N polarities.
Therefore, the space magnetic field structure is formed by pairwise opposition of the four transmitting coils, the uniformity and reliability of the formed transmitting field can be guaranteed, and the reliability and safety of wireless charging can be further guaranteed.
Further, in the magnetic field formed by the first pair of coils, the S pole is located in the area enclosed by the four coils. In the magnetic field formed by the second pair of coils, pole N is located in the area enclosed by the four coils.
Therefore, the polarity of the magnetic fields formed by the two pairs of coils is opposite, the stability of the transmitting field formed by the four coils can be improved, and the reliability and the safety of wireless charging can be improved.
Optionally, the transmitting end 10 may further include: a drive circuit. The excitation circuit may include: an excitation source and an emission capacitance.
Wherein the number of the excitation circuits is consistent with the number of the transmitting coils in the transmitting coil group. Each excitation circuit and the corresponding transmitting coil form a transmitting loop.
Therefore, a transmitting loop is formed by the exciting source and the transmitting capacitor and the transmitting coil, so that the electromagnetic signal transmission stability is good and the reliability is high.
More optionally, the excitation source may include: a crystal oscillator and a radio frequency power amplifier; when the transmitting coil set comprises three transmitting coils, the excitation source further comprises: an LC quadrature phase shifter.
When the transmitting coil group comprises three transmitting coils, the crystal oscillator, the LC quadrature phase shifter and the radio frequency power amplifier are sequentially connected into the corresponding transmitting loop; or, when the transmitting coil group comprises four transmitting coils, the crystal oscillator and the radio frequency power amplifier are sequentially connected to the corresponding transmitting loop.
Thus, when the number of the transmitting coils is three, the transmitting coils pass through the crystal oscillator and the radio frequency power amplifier; when the transmitting coil set comprises three transmitting coils, the excitation source further comprises: the LC quadrature phase shifter forms an excitation source, and the convenience and the reliability of forming three quadrature coils by three coils can be improved.
Further, when the transmitting coil set may include three transmitting coils, the three transmitting coils correspond to the same crystal oscillator and the same LC quadrature phase shifter.
The three excitation sources corresponding to the three transmitting coils are realized in a mode that the same crystal oscillator generates oscillation frequency, the same LC quadrature phase shifter provides phase shift, and then the three excitation sources are respectively connected with corresponding radio frequency power amplifiers.
For example: fig. 2 is a block diagram of a wireless power transmission scheme, and the core of the system is a quadrature transmitting coil and a high-power radio frequency signal source providing same-frequency phase difference feed. The signal source can be realized by selecting a mode that the same crystal oscillator generates oscillation frequency, an LC quadrature phase shifter provides phase shift, and then the signal source is respectively connected with a radio frequency power amplifier. The receiving end has the same structure as a common magnetic coupling resonant wireless energy transmission receiver, and comprises a receiving coil, a radio frequency rectifier, a DC-DC converter and a load (usually a mobile terminal).
The high-power rf signal source is S1 to S3 in fig. 1, and is also a structure from the crystal oscillator to the rf power amplifier in fig. 2.
Thus, by using the same crystal oscillator and LC quadrature phase shifter for the three transmit coils, the stability of forming the three quadrature coils and the uniformity of the transmit field can be improved.
In an alternative example, the receiving end 20 may be configured to receive the electromagnetic signal in a receiving range of the transmitting field, and convert the electromagnetic signal into an electrical signal required by a load to be charged.
For example: in the existing wireless charging device, an exciting coil, namely a transmitting coil, is a single coil, and a receiving coil is three pairwise orthogonal coils; some transmitting devices comprise a single excitation coil and three pairwise orthogonal transmitting coils, and the receiving ends comprise three pairwise orthogonal receiving coils and a single load coil.
In the scheme of the invention, the transmitting coils are three coils which are orthogonal pairwise, the receiving end is a single coil embedded in the mobile terminal, and a plurality of receiving coils surrounding the transmitting coils can simultaneously realize wireless power transmission, namely one-to-many, real-time and efficient charging can be realized; in addition, the wireless power transmission device is different from the traditional magnetic coupling resonant wireless power transmission topology, the transmitting coil and the receiving coil are mainly planar directly-wound coils generally, and the relative position of the coils is more strict, and the transmitting coil is composed of three pairwise orthogonal coils, so that a plurality of single coils embedded in the mobile terminal can be simultaneously charged, the constraint of the relative positions of the coils can be overcome, and the omnibearing non-contact wireless charging can be realized. In addition, the alternative scheme provided by the invention embodies that four peripheral coils are exciting coils, a receiving coil placing area is arranged inside the coil, a plurality of coils can be placed at the same time, one-to-many simultaneous real-time high-efficiency contactless wireless charging can be realized, the coil can be applied to various places of airports, stations and hotels to provide wireless power, and the coil can be applied to some special occasions, such as the fields of power transmission problems of human body implantation instruments such as cardiac pacemakers and the like, new energy electric vehicles and the like.
From this, form even transmitting field through a plurality of transmitting coil, can realize all-round contactless power transmission through all-round contactless wireless charging to realize nimble, safe, conveniently realizing removing wireless charging, thereby promote the convenience of charging, and do not influence user's normal use, promoted user experience greatly.
The electromagnetic signal received by the receiving end 20 includes: and the comprehensive electromagnetic signal transmitted by the transmitting coil group.
For example: the receiving coil of fig. 1 can receive the integrated electromagnetic signal of the transmitting coil, and the orthogonal arrangement of the transmitting coil can minimize the variation of the energy transmission efficiency relative to the angle variation of the receiving coil.
Therefore, the receiving end can receive the comprehensive electromagnetic signal sent by the transmitting coil assembly, the convenience and the flexibility of receiving the electromagnetic signal can be improved, and the convenience and the flexibility of charging are further improved.
Optionally, the receiving end 20 may include: a receive coil and a receive capacitor.
The receiving coil, the receiving capacitor and the load to be charged form a receiving loop.
For example: the receiving coil of fig. 1 can receive the integrated electromagnetic signal of the transmitting coil, and the orthogonal arrangement of the transmitting coil can minimize the variation of the energy transmission efficiency relative to the angle variation of the receiving coil.
Therefore, the comprehensive electromagnetic signal sent by the transmitting coil can be received through the matching arrangement of the receiving coil and the receiving capacitor, the receiving mode is simple and convenient, and the reliability of receiving the electromagnetic signal is high.
Optionally, the number of the receiving terminals 20 is more than one.
The transmitting end can charge more than one receiving end 20 one to many.
For example: the purpose of the three transmit coils in fig. 1 is to achieve a uniform field around the coils, and to achieve "one-to-many" (more than 3) charging, rather than one transmit coil for each receive coil.
From this, through the even transmission field of transmitting terminal formation, can charge to a plurality of receiving terminals, realize "one to many" real-time, high-efficient charging, "can realize" one to many "real-time charging, and need not traditional contact and the location of one-way wireless charging coil to can realize that the most genuine limit uses mobile terminal equipment limit to charge for it.
Optionally, the receiving end 20 may further include: a receiving end rectifier and a DC/DC module.
The receiving end rectifier and the DC/DC module are sequentially arranged between the receiving coil and a load to be charged or between the receiving capacitor and the load to be charged.
From this, through receiving end rectifier bridge and DC/DC module, can charge for the load of waiting to charge of multiple demand for wireless charging's application scope is wider, and flexibility and the convenience of charging can greatly promote, and charges according to the required signal of telecommunication of load and guaranteed the security of charging.
Through a large number of tests, the technical scheme of the embodiment is adopted, a uniform transmitting field is formed by a plurality of transmitting coils, all-dimensional non-contact type electric energy transmission can be realized, and mobile wireless charging can be flexibly, safely and conveniently realized.
According to the embodiment of the invention, a control method of the wireless charging device corresponding to the wireless charging device is also provided. The control method of the wireless charging device may include:
step 1, forming a uniform transmitting field through a transmitting coil group formed by more than three transmitting coils, and transmitting electromagnetic signals in the transmitting field.
And 2, receiving the electromagnetic signal in the receiving range of the transmitting field, and converting the electromagnetic signal into an electric signal required by a load to be charged.
From this, form even transmitting field through a plurality of transmitting coil, can realize all-round contactless power transmission through all-round contactless wireless charging to realize nimble, safe, conveniently realizing removing wireless charging, thereby promote the convenience of charging, and do not influence user's normal use, promoted user experience greatly.
In an alternative example, forming a uniform transmit field by a transmit coil assembly formed by more than three transmit coils may include: by arranging each two of the three transmitting coils in an orthogonal manner, the transmitting field of an inside-out transmitting type is formed in a manner of magnetic coupling resonance through orthogonal feeding.
Therefore, three orthogonal coils are formed through the three orthogonal transmitting coils, a uniform transmitting field can be formed, and the device is high in reliability and good in charging convenience.
Alternatively, when the transmitting coil set may include three transmitting coils, the receiving range may include: the radius is around the circle of the set value.
From this, use the receiving range that the circumference encloses through forming with the settlement radius, can realize removing and charge, can also realize charging one to many for it is more convenient to charge, and can guarantee normal use, is favorable to promoting user experience.
Optionally, alternating currents with the same frequency and orthogonal phases are applied to the three transmitting coils, so that the three transmitting coils form three orthogonal coils.
Therefore, the three transmitting coils are electrified with the same-frequency alternating current, so that the uniformity of a formed transmitting field is more facilitated, and the charging accuracy and reliability can be improved.
In an alternative example, forming a uniform transmit field by a transmit coil assembly formed by more than three transmit coils may include: the four transmitting coils adopt a space magnetic field structure distributed by S-N-S-N polar coils to form the transmitting field of an outside-in transmitting type.
From this, form even transmitting field through four transmitting coil, can realize the wireless contactless charging in wider space, and the convenience of charging is good, and user experience is better.
Optionally, when the transmitting coil set may include four transmitting coils, the receiving range may include: the area enclosed by the four coils.
Therefore, wireless charging is carried out in the area surrounded by the four transmitting coils, the charging mode is simple and convenient, and the charging reliability is high.
Optionally, the spatial magnetic field structure may include: among the four transmitting coils, a first pair of coils which are opposite to each other are electrified with excitation current with set phase, and a second pair of coils which are opposite to each other are electrified with excitation current with opposite phase of the set phase.
Therefore, the space magnetic field structure is formed by pairwise opposition of the four transmitting coils, the uniformity and reliability of the formed transmitting field can be guaranteed, and the reliability and safety of wireless charging can be further guaranteed.
In an optional embodiment, the scheme of the invention can realize omnibearing contactless power transmission by omnibearing contactless wireless charging, and realize flexible, safe and convenient mobile wireless charging; through realizing "one to many" real-time, high-efficient charging, "one to many" real-time charging can be realized, and need not traditional contact and the location of the wireless charging coil of unidirectional type to can realize that the limit in the true sense uses mobile terminal equipment limit to charge for it.
For example: in 9 months and 18 days (2017), apples finally come out to be equipped with wireless charging functions iPhone 8/8Plus and iPhone X, and the wireless charging technology is used for firing at one time. Unfortunately, they use the common Qi wireless charging standard, which means that the three new iphones must be attached to a charging cradle to enable wireless charging. This technology has been in fact available for several years, and the reality is that even with wireless charging, the user still needs to put the devices on the charging pad, which is still a pain-you cannot use these devices while charging, and in addition, the user either needs to prepare a charging pad for each device or needs a large charging pad to charge all devices at the same time, thus affecting the user's normal use and convenience experience. In addition, mobile terminal and charging panel need accurate positioning can realize high-efficient charging, and the positioning mode that adopts at present has: coil array type, movable coil type, and magnet attraction type.
In an alternative embodiment, the present invention provides an omnidirectional contactless charging system for the above charging schemes, which can be seen from the example shown in fig. 1.
According to the scheme of the invention, when the magnetic field generated by the transmitting coil is vertical to the receiving coil, the transmission efficiency reaches the highest value; on the contrary, when the magnetic field generated by the transmitting coil is parallel to the receiving coil, that is, the transmitting coil is perpendicular to the receiving coil, the transmitting coil shown in fig. 1 adopts three orthogonal coils, and the same-frequency alternating current and the receiving coils (only 1 is given in fig. 1) are used, and when the receiving coil is located at any position away from the origin of coordinates (a circle with a radius of R), the orthogonal transmitting resonance coil and the receiving coil system can be coupled and transmit magnetic field energy in all directions.
Alternatively, the orthogonal arrangement of the three coils is completely considered based on forming an omnidirectional transmitting field, when an orthogonal feed magnetic coupling resonant wireless energy transmission scheme is adopted, it can be considered that a magnetic field direction vector changes along with time, and periodically rotates from 0 ° to 360 °, and the change amount of the energy transmission efficiency relative to the angle change of the receiving coil is minimum.
Alternatively, the same frequency means that orthogonal coils (i.e. transmitting coils) are supplied with alternating current of the same frequency, and the phases are orthogonal.
Alternatively, the receiving coil of fig. 1 may receive the integrated electromagnetic signal of the transmitting coil, and the orthogonal arrangement of the transmitting coil may minimize the amount of change in the energy transfer efficiency with respect to the angular change of the receiving coil.
Alternatively, three transmit coils are provided in fig. 1 to achieve a uniform field around the coils, and to achieve "one-to-many" (more than 3) charging, instead of one transmit coil for each receive coil.
Alternatively, the distance between the receiving coil and the origin of coordinates may be a range in which wireless charging is realized. This range is typically several tens of centimeters, related to parameters such as resonant frequency, wire radius, coil radius, number of coil turns, electrical conductivity, and load resistance.
Alternatively, when the receiving coil is shifted in position on a circumference of radius R, the paired transmission relationship between the three transmitting coils and the receiving coil does not need to be shifted, and the orthogonal arrangement of the transmitting coils is considered based on this, the orthogonal arrangement can form a uniform field, and when the receiving coil is shifted in position on a circumference of radius R or a plurality of receiving coils are distributed on a circumference of radius R, the transmission efficiency is little changed.
Fig. 2 is a block diagram of a wireless power transmission scheme, and the core of the system is a quadrature transmitting coil and a high-power radio frequency signal source providing same-frequency phase difference feed. The signal source can be realized by selecting a mode that the same crystal oscillator generates oscillation frequency, an LC quadrature phase shifter provides phase shift, and then the signal source is respectively connected with a radio frequency power amplifier. The receiving end has the same structure as a common magnetic coupling resonant wireless energy transmission receiver, and comprises a receiving coil, a radio frequency rectifier, a DC-DC converter and a load (usually a mobile terminal).
The high-power rf signal source is S1 to S3 in fig. 1, and is also a structure from the crystal oscillator to the rf power amplifier in fig. 2.
In an alternative example, the scheme of the present invention can also be implemented by the scheme two shown in fig. 3. In the wireless power supply area shown in fig. 3, four coils at the periphery are excitation coils, and a receiving coil at the inner part is placed in the area. The second scheme adopts a space magnetic field structure distributed by S-N-S-N polar coils. The scheme can be applied to wireless power provided in various places such as airports, stations and hotels, and can be used in some special occasions such as the fields of power transmission problems of human body implantation instruments such as cardiac pacemakers and new energy electric vehicles.
The second scheme shown in fig. 3 and the first scheme shown in fig. 1 and 2 have the same point that a plurality of excitation coils form a uniform field to realize one-to-many charging. Wherein, the first scheme of fig. 1 and fig. 2 is around a circle with a radius R; and the second scheme of fig. 3 is an area enclosed by four coils. In the scheme two, four coils are arranged, and a space magnetic field structure distributed by S-N-S-N polar coils is adopted, namely two coils which are opposite to each other are electrified with excitation current, the S pole of each coil is positioned in the region enclosed by the four coils, the other two opposite coils are electrified with opposite-phase excitation current, and the N pole of each coil is positioned in the region enclosed by the four coils, namely the space magnetic field structure distributed by the S-N-S-N polar coils.
Since the processing and functions implemented by the control method of the present embodiment substantially correspond to the embodiments, principles and examples of the wireless charging device shown in fig. 1 to fig. 3, reference may be made to the related description in the foregoing embodiments for details which are not described in detail in the description of the present embodiment, and thus are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, a uniform transmitting field is formed by a plurality of transmitting coils, the traditional contact type and unidirectional wireless charging coil positioning is not needed, and the one-to-many real-time charging can be realized.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (14)
1. A wireless charging device, comprising: a transmitting end (10) and a receiving end (20); wherein,
the transmitting end (10) comprising: a transmitting coil group formed of three or more transmitting coils; the transmitting coil group is used for forming a uniform transmitting field and transmitting an electromagnetic signal in the transmitting field;
and the receiving end (20) is used for receiving the electromagnetic signal in the receiving range of the transmitting field and converting the electromagnetic signal into an electric signal required by a load to be charged.
2. The apparatus of claim 1, wherein the transmit coil assembly comprises: three transmitting coils;
and every two of the three transmitting coils are arranged orthogonally, and the transmitting field of an inside-to-outside transmitting type is formed in an orthogonal feed magnetic coupling resonance mode.
3. The apparatus of claim 2, wherein,
when the transmitting coil set includes three transmitting coils, the receiving range includes: the radius is around the circle of the set value;
and/or the presence of a gas in the gas,
alternating current with same frequency and orthogonal phase is conducted in the three transmitting coils, so that the three transmitting coils form three orthogonal coils.
4. The apparatus of claim 1, wherein the transmit coil assembly comprises: four transmitting coils;
the four transmitting coils form the transmitting field of an outside-in transmitting type by adopting a space magnetic field structure distributed by S-N-S-N polar coils.
5. The apparatus of claim 4, wherein,
when the transmitting coil set includes four transmitting coils, the receiving range includes: the area enclosed by the four coils;
and/or the presence of a gas in the gas,
the spatial magnetic field structure comprises:
among the four transmission coils,
a first pair of coils opposite to each other is supplied with an excitation current of a set phase, and a second pair of coils opposite to each other is supplied with an excitation current of the opposite phase of the set phase.
6. The apparatus of claim 5, wherein,
in the magnetic field formed by the first pair of coils, S pole is positioned in the area enclosed by the four coils;
in the magnetic field formed by the second pair of coils, pole N is located in the area enclosed by the four coils.
7. The apparatus according to one of claims 1-6, wherein the transmitting end (10) further comprises: an excitation circuit; the excitation circuit includes: an excitation source and a transmission capacitor;
the number of the excitation circuits is consistent with that of the transmitting coils in the transmitting coil group;
each excitation circuit and the corresponding transmitting coil form a transmitting loop.
8. The apparatus of claim 7, wherein the excitation source comprises: a crystal oscillator and a radio frequency power amplifier; when the transmitting coil set comprises three transmitting coils, the excitation source further comprises: an LC quadrature phase shifter; wherein,
when the transmitting coil group comprises three transmitting coils, the crystal oscillator, the LC quadrature phase shifter and the radio frequency power amplifier are sequentially connected into the corresponding transmitting loop;
or,
when the transmitting coil group comprises four transmitting coils, the crystal oscillator and the radio frequency power amplifier are sequentially connected to corresponding transmitting loops.
9. The apparatus of claim 8, wherein when the transmit coil set comprises three transmit coils, the three transmit coils correspond to a same crystal oscillator and a same LC quadrature phase shifter;
the three excitation sources corresponding to the three transmitting coils are realized in a mode that the same crystal oscillator generates oscillation frequency, the same LC quadrature phase shifter provides phase shift, and then the three excitation sources are respectively connected with corresponding radio frequency power amplifiers.
10. The apparatus according to one of claims 1 to 9, wherein,
the receiving end (20) comprises: a receiving coil and a receiving capacitor;
the receiving coil, the receiving capacitor and the load to be charged form a receiving loop;
and/or the presence of a gas in the gas,
the number of the receiving ends (20) is more than one;
the transmitting end can charge more than one receiving end (20) in a one-to-many manner;
and/or the presence of a gas in the gas,
the receiving end (20) receives an electromagnetic signal, comprising: and the comprehensive electromagnetic signal transmitted by the transmitting coil group.
11. The apparatus of claim 10, wherein the receiving end (20) further comprises: a receiving end rectifier and a DC/DC module; wherein,
the receiving end rectifier and the DC/DC module are sequentially arranged between the receiving coil and a load to be charged or between the receiving capacitor and the load to be charged.
12. A method for controlling a wireless charging apparatus according to any one of claims 1 to 11, comprising:
forming a uniform transmitting field through a transmitting coil group formed by more than three transmitting coils, and transmitting an electromagnetic signal in the transmitting field;
and in the receiving range of the transmitting field, receiving the electromagnetic signal and converting the electromagnetic signal into an electric signal required by the load to be charged.
13. The method of claim 12, wherein forming a uniform transmit field with a transmit coil assembly of three or more transmit coils comprises:
forming the transmitting field of an inside-out transmitting type in a mode of magnetic coupling resonance through orthogonal feed by enabling every two transmitting coils of the three transmitting coils to be arranged orthogonally;
or,
the four transmitting coils adopt a space magnetic field structure distributed by S-N-S-N polar coils to form the transmitting field of an outside-in transmitting type.
14. The method of claim 13, wherein,
when the transmitting coil set includes three transmitting coils, the receiving range includes: the radius is around the circle of the set value;
and/or the presence of a gas in the gas,
alternating current with the same frequency and orthogonal phase is conducted in the three transmitting coils, so that the three transmitting coils form three orthogonal coils;
or,
when the transmitting coil set includes four transmitting coils, the receiving range includes: the area enclosed by the four coils;
and/or the presence of a gas in the gas,
the spatial magnetic field structure comprises:
among the four transmitting coils, a first pair of coils which are opposite to each other are electrified with excitation current with set phase, and a second pair of coils which are opposite to each other are electrified with excitation current with opposite phase of the set phase.
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