CN113078744A - Magnetic resonance wireless charging device - Google Patents
Magnetic resonance wireless charging device Download PDFInfo
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- CN113078744A CN113078744A CN202110468470.0A CN202110468470A CN113078744A CN 113078744 A CN113078744 A CN 113078744A CN 202110468470 A CN202110468470 A CN 202110468470A CN 113078744 A CN113078744 A CN 113078744A
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- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical group [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
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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
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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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
- H02J7/007—Regulation of charging or discharging current or voltage
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Abstract
The invention relates to a magnetic resonance wireless charging device, wherein a transmitting end comprises a plurality of resonance transmitting circuits connected in parallel and a power supply circuit used for driving each resonance transmitting circuit, each resonance transmitting circuit is respectively provided with a transmitting coil, each transmitting coil is respectively arranged on a supporting device, each transmitting coil is surrounded to form a space concave curved surface structure, and each transmitting coil is respectively in a concave curved surface structure; the resonance receiving circuit is provided with receiving coils and is used for receiving the electromagnetic waves transmitted by the transmitting coils; and the control unit is used for calculating the electric energy transmission efficiency according to the voltage and the current of the output end of the resonance receiving circuit and the current and the voltage of the output end of the power supply circuit when the receiving coil receives the electromagnetic waves transmitted by the transmitting coil, and adjusting the angle and/or the position of the supporting device when the electric energy transmission efficiency is smaller than the preset transmission efficiency. The magnetic resonance wireless charging device reduces the magnetic flux leakage risk of the device, shields the cost, improves the energy utilization rate and has high charging efficiency.
Description
Technical Field
The invention belongs to the technical field of wireless charging, and particularly relates to a magnetic resonance wireless charging device.
Background
Wireless charging methods are various, but electromagnetic induction methods and magnetic resonance methods, which perform power transmission by magnetic coupling, are currently the mainstream methods, and electromagnetic induction methods and magnetic resonance methods, which perform power transmission in a non-contact manner by magnetic fields generated by receiving and transmitting coils. In a charging environment with higher voltage or larger current, such as an electric automobile, the wireless power transmission avoids the direct contact of a human body with a conductor, so that the safety is higher; the wireless power transmission saves complex wiring procedures or battery replacement, so that the wireless power transmission is more convenient; the built-in difficult damage of wireless charging wire can eliminate the short circuit that cable, connector and plug arouse, so stability is more stable than limited transmission of electricity. The electromagnetic induction type wireless charging is widely used in products such as electric shavers, electric toothbrushes, mobile phones and the like, and has the advantages of simple principle and structure and low cost; however, when the relative position and distance between the transmitting coil and the receiving coil become large, the power transmission efficiency decreases rapidly, so that the coils must be kept at a short distance, and the application range is limited. In the magnetic resonance wireless charging, capacitors are inserted into a transmission side and a reception side to form an LC resonance circuit, and power transmission is performed after the resonance frequencies of the transmission side and the reception side are matched. The advantage of this mode is that can draw the distance of big coil, can carry out wireless charging for many mobile device simultaneously. But has the following disadvantages: the high-power wireless charging transmitting coil can enable surrounding people, animals and live broadcast to be radiated by electromagnetic fields exceeding the standard, the radiation of electric fields and magnetic fields exceeding the standard can bring harm to surrounding animals and plants, and can influence the normal operation of electronic equipment, so that a large amount of cost is needed to be spent on electromagnetic shielding at present; in addition, the magnetic resonance wireless charging product needs extremely high accuracy when in use, the transmission efficiency of electric energy is obviously influenced by the changes of the position and the angle between the transmitting coil and the receiving coil, and the use requirement is high, so that the large-scale application of the magnetic resonance wireless charging product is limited.
Disclosure of Invention
The technical problem solved by the invention is as follows: a magnetic resonance wireless charging device reduces the magnetic flux leakage risk and the shielding cost of the charging device; the energy utilization rate and the electric energy transmission efficiency are improved.
The specific solution provided by the invention comprises the following steps:
the invention provides a magnetic resonance wireless charging device, comprising: a support device; the transmitting end comprises a plurality of resonant transmitting circuits connected in parallel and a power circuit used for driving each resonant transmitting circuit, each resonant transmitting circuit is provided with a transmitting coil, each transmitting coil is arranged on the supporting device and forms a spatial concave curved surface structure in an enclosing manner, and each transmitting coil is of a concave curved surface structure; the receiving end comprises a resonance receiving circuit, and the resonance receiving circuit is used for receiving coils and is used for receiving the electromagnetic waves transmitted by the transmitting coils; the adjusting device is used for adjusting the angle and/or the position of the supporting device; the detection device is used for detecting the voltage and the current of the output end of the resonance receiving circuit and the voltage and the current of the output end of the power supply circuit and sending the voltage and the current of the output end of the resonance receiving circuit and the voltage and the current of the output end of the power supply circuit to the control unit; and the control unit is used for calculating the electric energy transmission efficiency according to the voltage and the current of the output end of the resonance receiving circuit and the current and the voltage of the output end of the power supply circuit when the receiving coil receives the electromagnetic waves transmitted by the transmitting coil, and adjusting the angle and/or the position of the supporting device when the electric energy transmission efficiency is smaller than the preset transmission efficiency until the electric energy transmission efficiency is not smaller than the preset transmission efficiency.
Based on the technical scheme of the invention, the method has the following beneficial technical effects:
the coils with the concave curved surface structure are arranged in an enclosing mode to form a space concave curved surface structure, the coils act simultaneously, a strong magnetic field is generated at a specific position (on one side of a concave surface of the space concave curved surface structure) through electromagnetic wave interference, magnetic fields near other positions (on one side of a convex surface of the space concave curved surface structure or near the concave surface of the space concave curved surface structure) are offset, the magnetic field is weak, even if the magnetic field of the magnetic field in the equipment to be charged is stronger, the magnetic field intensity is reduced at other positions without the need of the magnetic field intensity, the risk of external magnetic leakage is reduced, the shielding cost is reduced; and the angle and the position of the transmitting end are adjusted through the adjusting unit so as to achieve higher charging power and charging efficiency.
On the basis of the scheme, the invention can be further improved as follows:
further, the device comprises an infrared detection unit used for detecting whether the charging position of the transmitting end is placed with the transmitting coil or not, and the infrared detection unit is electrically connected with the control unit.
Specifically, the infrared detection unit is an infrared sensor, and when a receiving end (transmitting coil) to be charged is at a charging level, the control unit starts to calculate the electric energy transmission efficiency and transmits the angle and/or position of the receiving end as required until the electric energy transmission efficiency meets the requirement.
Furthermore, the spatial concave curved surface structure is 1/8-1/3 spherical curved surfaces or 1/8-1/3 ellipsoidal curved surfaces.
Therefore, a strong magnetic field with a certain distance can be generated on the concave side of the concave curved surface of the space, the magnetic field can be used for charging high-power equipment at a long distance, such as vehicles and the like, the magnetic field on the convex side of the concave curved surface of the space is weak, and the shielding cost is low.
Optionally, the spatial concave curved surface structure is a spherical curved surface of 1/2-7/8 or a semi-ellipsoidal curved surface of 1/2-7/8, so that a strong magnetic field can be generated inside the spatial concave curved surface structure, and the spatial concave curved surface structure can be used for charging devices with small size, such as mobile phones and bluetooth earphones.
Alternatively, the spatial concave curved surface structure may also be an irregular spatial curved surface structure. The structure and position of the transmitting coil can be adjusted when the charging device is designed so as to generate a stronger charging magnetic field in a required specific direction and a required specific distance.
Further, an iron core is arranged in the middle of each transmitting coil, and each transmitting coil is made of an iron core with a wire wound around the middle of the transmitting coil.
The iron core with magnetic conductivity is added in the middle of the coil, and the iron core can concentrate magnetic lines around the coil, so that the local magnetic field intensity can be increased, and the intensity of the charging magnetic field of the charging device in a specific direction and a specific distance can be increased.
Specifically, the iron core and the transmitting coil are fixed through glue or screws, and the connection fixity of the iron core and the transmitting coil is further improved.
Furthermore, one of the iron cores is arranged in the middle of the transmitting coil and is perpendicular to a tangent plane in the middle of the transmitting coil, the other iron cores are arranged around the iron core in the middle, and the length of one side, close to the iron core in the middle, of each of the other iron cores is larger than that of one side, far away from the iron core in the middle, of each of the other iron cores.
The length of one side of each iron core, which is close to the iron core at the middle part, is increased, the magnetic field intensity along the axial direction of the iron core at the middle part can be enhanced, the magnetic field intensity of the convex surface side of the space concave curved surface structure and the magnetic field intensity of the concave surface accessory of the space concave curved surface structure are reduced, and the magnetic field leakage risk is reduced.
Furthermore, the supporting device comprises a first magnetic shielding shell, the first magnetic shielding shell is fixed on the adjusting device, the first magnetic shielding shell covers one side of the convex surface of each transmitting coil, and each transmitting coil is fixedly connected with the first magnetic shielding shell.
Therefore, the first magnetic shielding shell can shield the magnetic field leaked outside the concave curved surface structure, and can fix the position of each transmitting coil and be integrally arranged.
Specifically, the first magnetic shielding shell is matched with the structure of the spatial concave curved surface structure.
Further, the first magnetic shield shell is made of a mixed material of a magnetic material with high magnetic permeability and a metal material with high electric conductivity.
Specifically, the mixed material of the magnetic material with high magnetic conductivity and the metal material with high electric conductivity is obtained by compression molding, and has a good magnetic shielding effect.
Furthermore, the supporting device comprises a plurality of second magnetic shielding shells, each second magnetic shielding shell is fixedly connected with the adjusting device, each second magnetic shielding shell is of a disc-shaped structure, and each transmitting coil is fixed in one second magnetic shielding shell.
Therefore, the space concave curved surface structure formed by the surrounding of each charging coil can be integrally shielded by adopting the first magnetic shielding shell, and the charging coils can be individually shielded in a one-to-one correspondence manner by adopting the second magnetic shielding shell; also can adopt second magnetism shielding shell to carry out the independent shielding of one-to-one to the charging coil after, adopt first magnetism shielding shell again to enclose the space spill curved surface structure that establishes into to each charging coil and carry out whole shielding, all can realize good magnetism shielding effect.
Further, the adjusting device comprises a translation adjusting structure for adjusting the horizontal position of the supporting device, the translation adjusting structure comprises a first translation lead screw, a first translation slide rail, a first translation slider, a first translation motor for driving the first translation lead screw to rotate, a second translation lead screw, a second translation slide rail, a second translation slider and a second translation motor for driving the second translation lead screw to rotate, the first translation lead screw and the first translation slide rail are arranged in parallel, the first translation slider is connected with a nut of the first translation lead screw, and the first translation slider is connected with the first translation slide rail in a sliding manner; the second translation screw rod and the second translation sliding rail are arranged in parallel, the second translation sliding block is connected with a nut of the second translation screw rod, the second translation sliding block is connected with the second translation sliding rail in a sliding mode, the second translation sliding rail is perpendicular to the first translation sliding rail, the second translation sliding rail is fixed on the first translation sliding block, the supporting device is fixed on the second translation sliding block, and the control unit is respectively electrically connected with the first translation motor and the second translation motor.
Therefore, the control unit can adjust the position of the supporting device (transmitting end) moving along the direction of the first translation slide rail and the position of the supporting device (transmitting end) moving along the direction of the second translation slide rail according to the requirements, compared with the electromagnetic induction type wireless charging magnet, the magnetic resonance type wireless charging magnet can realize longer-distance charging, but the requirement on the coupling degree of the transmitting coil and the receiving coil is also high, for the receiving end and the transmitting end (device to be charged) with specific structures, the optimal position between the receiving end and the transmitting end, namely the position of the optimal charging potential with the maximum coupling degree is determined, therefore, after the height and the angle of the transmitting end are fixed, the position of the optimal charging potential is fixed, the height and the angle of the transmitting end can be set in advance, then the charging potential is set, when in use, only the device to be charged with the receiving coil needs to be roughly placed at the charging potential, and then the adjusting, the horizontal positions of the transmitting end and the optimal charging potential are finely adjusted, so that the receiving coil of the device to be charged is just positioned on the optimal charging potential, and the electric energy transmission efficiency is optimal.
Furthermore, adjusting device still includes the angle modulation structure that is used for adjusting the strutting arrangement angle, angle modulation structure includes vertical setting's pivot and is used for the drive pivot pivoted third motor, the third motor is fixed in on the second translation slider, strutting arrangement is fixed in the pivot, the third unit is connected with the control unit electricity.
The transmitting coils on the transmitting end can be adjusted simultaneously through angle adjustment and position adjustment, so that the receiving end and the transmitting end achieve better coupling degree, and the application range is wide.
The wireless charging receiving coil of the resonance receiving circuit is electrically connected with the input end of the rectifying circuit, and the output end of the rectifying circuit is connected with a target load or a rechargeable battery.
Specifically, the power circuit comprises a power supply, a rectification filter circuit and an inverter circuit.
Specifically, the detection device comprises a first current-voltage detection circuit and a second current-voltage detection circuit, wherein the first current-voltage detection circuit is connected with the output end of the inverter circuit and is used for detecting the voltage and the current of the output end of the inverter circuit and sending the voltage and the current to the control unit; and the second current and voltage detection circuit is connected with the output end of the resonance receiving circuit and is used for detecting the current and the voltage at the output end of the resonance receiving circuit and sending the current and the voltage to the control unit.
Specifically, the control unit includes: the first calculation module is used for receiving the voltage and the current of the output end of the inverter circuit sent by the first current and voltage detection circuit, performing power calculation to obtain output power and sending the output power to the control module; the second calculation module is used for receiving the current and the voltage of the output end of the resonance receiving circuit, which are sent by the second current and voltage detection circuit, performing power calculation to obtain charging power and sending the charging power to the control module; and the control module calculates the electric energy transmission efficiency according to the charging power and the output power and sends the electric energy transmission efficiency to the angle adjusting unit.
Specifically, the first computing module and the control module are connected through a bluetooth module.
Specifically, the first computing module sends the calculated output power to a first bluetooth module, the control module is connected with a second bluetooth module, and the first computing module and the control module are connected through the first bluetooth module and the second bluetooth module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a transmitting end in a first embodiment according to the present invention.
Fig. 2 is a schematic structural diagram of a magnetic resonance wireless charging device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a transmitting end in a second embodiment according to the present invention.
Fig. 4 is a schematic structural diagram of a second magnetic shield case and a transmitting coil according to a third embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an adjusting device according to an embodiment of the present invention.
In fig. 1-5, the names of the components represented by the respective reference numerals are as follows:
1. a transmitting coil; 11. an iron core;
2. a support device; 21. a first magnetic shield case; 22. a second magnetic shield case;
3. an adjustment device; 31. a first translation lead screw; 32. a first translation slide rail; 33. a first translation slide rail; 34. a first translation motor; 35. a second translation lead screw; 36. a second translation slide rail; 37. a second translation slide; 38. a rotating shaft.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention is described below with reference to specific embodiments in conjunction with fig. 1-5.
As shown in fig. 1 to 5, the present invention provides a magnetic resonance wireless charging apparatus, including: a support device 2; a transmitting terminal including a plurality of resonant transmitting circuits connected in parallel and a power circuit for driving the resonant transmitting circuits, each of the resonant transmitting circuits having a transmitting coil 1, L1Each transmitting coil 1 is respectively arranged on the supporting device, the transmitting coils 1 are surrounded to form a spatial concave curved surface structure, and each transmitting coil 1 is respectively of a concave curved surface structure; a receiving end comprising a resonant receiving circuit with a receiving coil L2For receiving the electromagnetic wave transmitted by each of the transmitting coils 1; the adjusting device is used for adjusting the angle and/or the position of the supporting device; detection means for detecting the output of said resonant receiving circuitThe voltage and the current as well as the voltage and the current at the output end of the power supply circuit are sent to the control unit; and the control unit is used for calculating the electric energy transmission efficiency according to the voltage and the current of the output end of the resonance receiving circuit and the current and the voltage of the output end of the power supply circuit when the receiving coil receives the electromagnetic waves transmitted by the transmitting coil, and adjusting the angle and/or the position of the supporting device when the electric energy transmission efficiency is smaller than the preset transmission efficiency until the electric energy transmission efficiency is not smaller than the preset transmission efficiency. According to the magnetic resonance wireless charging device, the coils with the concave curved surface structures are arranged in an enclosing mode to form the spatial concave curved surface structures, the coils act simultaneously, so that the magnetic field of the magnetic field in equipment to be charged is stronger, the magnetic field intensity is reduced at other positions where the magnetic field intensity is not needed, the risk of external magnetic leakage is reduced, the influence on the environment is reduced, the energy utilization rate is improved, and the shielding cost is reduced; the angle and the position of the transmitting end are adjusted through the adjusting unit so as to achieve higher charging power and charging efficiency.
The magnetic resonance wireless charging device based on the embodiment of the invention further comprises an infrared detection unit for detecting whether the transmitting coil 1 is placed at the charging position of the transmitting end, and the infrared detection unit is electrically connected with the control unit.
Specifically, the infrared detection unit is an infrared sensor, and when the receiving end to be charged is at a charging level, the control unit starts to calculate the electric energy transmission efficiency and transmits the angle and/or position of the receiving end as required until the electric energy transmission efficiency meets the requirement.
Based on the magnetic resonance wireless charging device provided by the embodiment of the invention, the spatial concave curved surface structure is 1/8-1/3 spherical curved surfaces or 1/8-1/3 ellipsoidal curved surfaces. The strong magnetic field with a certain distance can be generated on the concave side of the concave curved surface of the space, the magnetic field can be used for charging high-power equipment at a longer distance, such as vehicles and the like, the magnetic field on the convex side of the concave curved surface of the space is weak, and the shielding cost is low.
Optionally, the spatial concave curved surface structure is a spherical curved surface of 1/2-7/8 or a semi-ellipsoidal curved surface of 1/2-7/8, so that a strong magnetic field can be generated inside the spatial concave curved surface structure, and the spatial concave curved surface structure can be used for charging devices with small size, such as mobile phones and bluetooth earphones.
Alternatively, the spatial concave curved surface structure may also be an irregular spatial curved surface structure. The structure and position of the transmitting coil can be adjusted when the charging device is designed so as to generate a stronger charging magnetic field in a required specific direction and a required specific distance.
As shown in fig. 1, in the magnetic resonance wireless charging device according to the embodiment of the present invention, an iron core 11 is disposed in a middle portion of each of the transmitting coils 1, and each of the transmitting coils is made of an iron core in which a wire is wound. The iron core with magnetic conductivity is added in the middle of the coil, and the iron core can concentrate magnetic lines around the coil, so that the local magnetic field intensity can be increased, and the intensity of the charging magnetic field of the charging device in a specific direction and a specific distance can be increased.
Specifically, the iron core and the transmitting coil are fixed through glue or screws, and the connection fixity of the iron core and the transmitting coil is further improved.
According to the magnetic resonance wireless charging device disclosed by the embodiment of the invention, one iron core 11 is arranged in the middle of the transmitting coil and is vertical to a tangent plane in the middle of the transmitting coil, the other iron cores are arranged around the iron core in the middle, and the length of one side of each iron core close to the iron core in the middle is greater than that of one side of each iron core far away from the iron core in the middle. The length of one side of each iron core, which is close to the iron core at the middle part, is increased, the magnetic field intensity along the axial direction of the iron core at the middle part can be enhanced, the magnetic field intensity of the convex surface side of the space concave curved surface structure and the magnetic field intensity of the concave surface accessory of the space concave curved surface structure are reduced, and the magnetic field leakage risk is reduced.
As shown in fig. 3, according to the magnetic resonance wireless charging device of the embodiment of the present invention, the supporting device 2 includes a first magnetic shielding case 21, the first magnetic shielding case 21 is fixed to the adjusting device, the first magnetic shielding case 21 is covered on the convex side of each transmitting coil 1, and each transmitting coil 1 is fixedly connected to the first magnetic shielding case 21. The first magnetic shielding shell can shield a magnetic field leaked outside the concave curved surface structure, and can fix the positions of the transmitting coils to be integrally arranged.
Specifically, the first magnetic shielding shell is matched with the structure of the spatial concave curved surface structure.
According to the magnetic resonance wireless charging device provided by the embodiment of the invention, the first magnetic shielding shell is prepared from a mixed material of a magnetic material with high magnetic conductivity and a metal material with high electric conductivity.
Specifically, the mixed material of the magnetic material with high magnetic conductivity and the metal material with high electric conductivity is obtained by compression molding, and has a good magnetic shielding effect.
As shown in fig. 4, according to the magnetic resonance wireless charging device of the embodiment of the present invention, the supporting device 2 includes a plurality of second magnetic shielding shells 22, each of the second magnetic shielding shells 22 is fixedly connected to the adjusting device 3, each of the second magnetic shielding shells 22 is a disk-shaped structure, and each of the transmitting coils 1 is fixed in one of the second magnetic shielding shells 22. The space concave curved surface structure formed by the surrounding of the charging coils can be integrally shielded by adopting the first magnetic shielding shell, and the charging coils can be independently shielded in a one-to-one correspondence manner by adopting the second magnetic shielding shell; also can adopt second magnetism shielding shell to carry out the independent shielding of one-to-one to the charging coil after, adopt first magnetism shielding shell again to enclose the space spill curved surface structure that establishes into to each charging coil and carry out whole shielding, all can realize good magnetism shielding effect.
As shown in fig. 5, in the magnetic resonance wireless charging device according to the embodiment of the present invention, the adjusting device 3 includes a translation adjusting structure for adjusting a horizontal position of the supporting device, the translation adjusting structure includes a first translation lead screw 31, a first translation slide rail 32, a first translation slider 33, a first translation motor 34, a second translation lead screw 35, a second translation slide rail 36, a second translation slider 37, and a second translation motor for driving the second translation lead screw to rotate, the first translation lead screw 31 and the first translation slide rail 32 are arranged in parallel, the first translation slider 33 is connected to a nut of the first translation lead screw 31, and the first translation slider 33 is connected to the first translation slide rail 32 in a sliding manner; the second translation lead screw 35 and the second translation slide rail 36 are arranged in parallel, the second translation slide block 37 is connected with a nut of the second translation lead screw 35, the second translation slide block 37 is connected with the second translation slide rail 36 in a sliding manner, the second translation slide rail 36 is arranged perpendicular to the first translation slide rail 32, the second translation slide rail 36 is fixed on the first translation slide block 33, the supporting device is fixed on the second translation slide block 37, and the control unit is respectively electrically connected with the first translation motor 34 and the second translation motor. Specifically, the first translation slide rail, the second translation slide rail and the charging position are arranged in parallel, and the second translation slide block is vertically arranged on the second translation slide block. The control unit can adjust the position of the supporting device (transmitting end) moving along the direction of the first translation slide rail and the position of the supporting device (transmitting end) moving along the direction of the second translation slide rail according to the requirements, compared with the electromagnetic induction type wireless charging electromagnet, the magnetic resonance type wireless charging electromagnet can realize longer-distance charging, but the requirement on the coupling degree of the transmitting coil and the receiving coil is also high, for the transmitting end (device to be charged) of the receiving end with a specific structure, the optimal position between the transmitting end and the receiving end, namely the position of the optimal charging potential with the maximum coupling degree is determined, therefore, after the height and the angle of the transmitting end are fixed, the position of the optimal charging potential is fixed, the height and the angle of the transmitting end can be set in advance, then the charging potential is set, when in use, the device to be charged with the receiving coil only needs to be roughly placed at the charging position, then the, the horizontal positions of the transmitting end and the optimal charging potential are finely adjusted, so that the receiving coil of the device to be charged is just positioned on the optimal charging potential, and the electric energy transmission efficiency is optimal.
Based on the magnetic resonance wireless charging device provided by the embodiment of the invention, the adjusting device further comprises an angle adjusting structure for adjusting the angle of the supporting device, the angle adjusting structure comprises a vertically arranged rotating shaft 38 and a third motor for driving the rotating shaft to rotate, the third motor is fixed on the second translation sliding block 37, the supporting device is fixed on the rotating shaft, and the third unit is electrically connected with the control unit. The transmitting terminal can be adjusted by angle adjustment and position adjustment simultaneously, so that the receiving terminal and the transmitting terminal reach a better coupling degree, and the application range is wide.
Specifically, as shown in fig. 2, the wireless charging system further includes a rectifying circuit, an output end of the wireless charging receiving coil is electrically connected to an input end of the rectifying circuit, and an output end of the rectifying circuit is connected to a target load or a rechargeable battery.
Specifically, the power circuit comprises a power supply, a rectification filter circuit and an inverter circuit.
Specifically, the detection device comprises a first current-voltage detection circuit and a second current-voltage detection circuit, wherein the first current-voltage detection circuit is connected with the output end of the inverter circuit and is used for detecting the voltage and the current of the output end of the inverter circuit and sending the voltage and the current to the control unit; and the second current and voltage detection circuit is connected with the output end of the resonance receiving circuit and is used for detecting the current and the voltage at the output end of the resonance receiving circuit and sending the current and the voltage to the control unit.
Specifically, as shown in fig. 3, the control unit includes: the first calculation module is used for receiving the voltage and the current of the output end of the inverter circuit sent by the first current and voltage detection circuit, performing power calculation to obtain output power and sending the output power to the control module; the second calculation module is used for receiving the current and the voltage of the output end of the resonance receiving circuit, which are sent by the second current and voltage detection circuit, performing power calculation to obtain charging power and sending the charging power to the control module; and the control module calculates the electric energy transmission efficiency according to the charging power and the output power and sends the electric energy transmission efficiency to the angle adjusting unit. Specifically, the first computing module and the control module are connected through a bluetooth module. Specifically, the first computing module sends the calculated output power to a first bluetooth module, the control module is connected with a second bluetooth module, and the first computing module and the control module are connected through the first bluetooth module and the second bluetooth module.
Specifically, the control module is a single chip microcomputer.
Although embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A magnetic resonance wireless charging apparatus, comprising:
a support device (2);
the transmitting terminal comprises a plurality of resonant transmitting circuits connected in parallel and a power circuit used for driving each resonant transmitting circuit, each resonant transmitting circuit is provided with a transmitting coil (1), each transmitting coil is arranged on the supporting device (2) respectively, each transmitting coil (1) is surrounded to form a spatial concave curved surface structure, and each transmitting coil (1) is a concave curved surface structure;
the receiving end comprises a resonance receiving circuit, the resonance receiving circuit is provided with a receiving coil and is used for receiving the electromagnetic waves transmitted by each transmitting coil (1);
-adjustment means (3) for adjusting the angle and/or position of said support means;
the detection device is used for detecting the voltage and the current of the output end of the resonance receiving circuit and the voltage and the current of the output end of the power supply circuit and sending the voltage and the current of the output end of the resonance receiving circuit and the voltage and the current of the output end of the power supply circuit to the control unit;
and the control unit is used for calculating the electric energy transmission efficiency according to the voltage and the current of the output end of the resonance receiving circuit and the current and the voltage of the output end of the power supply circuit when the receiving coil receives the electromagnetic waves transmitted by the transmitting coil, and adjusting the angle and/or the position of the supporting device when the electric energy transmission efficiency is smaller than the preset transmission efficiency until the electric energy transmission efficiency is not smaller than the preset transmission efficiency.
2. The magnetic resonance wireless charging device according to claim 1, further comprising an infrared detection unit for detecting whether the transmitting coil (1) is placed at the charging position of the transmitting terminal, wherein the infrared detection unit is electrically connected to the control unit.
3. The magnetic resonance wireless charging device of claim 1, wherein the spatial concave curved surface structure is a spherical curved surface of 1/8-1/3 or an ellipsoidal curved surface of 1/8-1/3.
4. The wireless magnetic resonance charging device according to claim 1, wherein an iron core (11) is disposed in a middle portion of each of the transmitting coils (1), and each of the transmitting coils is made of an iron core with a wire wound around the middle portion thereof.
5. The wireless charging device of claim 4, wherein one of the iron cores (11) is disposed in the middle of the transmitting coil and perpendicular to a tangent plane at the middle of the transmitting coil, the other iron cores are disposed around the iron core at the middle, and the length of the side of the other iron cores near the iron core at the middle is greater than the length of the side of the other iron cores far from the iron core at the middle.
6. The magnetic resonance wireless charging device according to claim 1, wherein the supporting device (2) comprises a first magnetic shielding housing (21), the first magnetic shielding housing (21) is fixed to the adjusting device, the first magnetic shielding housing (21) covers the convex side of each transmitting coil (1), and each transmitting coil (1) is fixedly connected with the first magnetic shielding housing (21).
7. A magnetic resonance wireless charging apparatus according to claim 6, characterized in that the first magnetically shielded housing (21) is made of a mixed material of a magnetic material of high magnetic permeability and a metallic material of high electric conductivity.
8. The magnetic resonance wireless charging device according to claim 1, wherein the supporting device (2) comprises a plurality of second magnetic shielding shells (22), each second magnetic shielding shell (22) is fixedly connected with the adjusting device (3), each second magnetic shielding shell (22) is a disk-shaped structure, and each transmitting coil (1) is fixed in one second magnetic shielding shell (22).
9. A magnetic resonance wireless charging apparatus according to any one of claims 1-8, the adjusting device (3) comprises a translation adjusting structure for adjusting the horizontal position of the supporting device, the translation adjusting structure comprises a first translation lead screw (31), a first translation slide rail (32), a first translation slide block (33), a first translation motor (34) for driving the first translation lead screw to rotate, a second translation lead screw (35), a second translation slide rail (36), a second translation slide block (37) and a second translation motor for driving the second translation lead screw to rotate, wherein the first translation lead screw, the first translation slide rail (32), the first translation slide block (33), the first translation motor and the second translation motor are respectively and horizontally arranged, the first translation lead screw (31) and the first translation slide rail (32) are arranged in parallel, the first translation sliding block (33) is connected with a nut of the first translation screw rod (31), the first translation sliding block (33) is connected with the first translation sliding rail (32) in a sliding manner; the second translation screw rod (35) and the second translation sliding rail (36) are arranged in parallel, the second translation sliding block (37) is connected with a nut of the second translation screw rod (35), the second translation sliding block (37) is connected with the second translation sliding rail (36) in a sliding mode, the second translation sliding rail (36) is perpendicular to the first translation sliding rail (32), the second translation sliding rail (36) is fixed on the first translation sliding block (33), the supporting device is fixed on the second translation sliding block (37), and the control unit is respectively electrically connected with the first translation motor (34) and the second translation motor.
10. The magnetic resonance wireless charging device according to claim 9, wherein the adjusting device further comprises an angle adjusting structure for adjusting the angle of the supporting device, the angle adjusting structure comprises a vertically arranged rotating shaft (38) and a third motor for driving the rotating shaft to rotate, the third motor is fixed on the second translation slider (37), the supporting device is fixed on the rotating shaft (38), and the third unit is electrically connected with the control unit.
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| CN202110468470.0A CN113078744A (en) | 2021-04-28 | 2021-04-28 | Magnetic resonance wireless charging device |
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Application publication date: 20210706 |