CN116054433B - Mobile wireless charging transmitting terminal - Google Patents
Mobile wireless charging transmitting terminal Download PDFInfo
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- CN116054433B CN116054433B CN202310307884.4A CN202310307884A CN116054433B CN 116054433 B CN116054433 B CN 116054433B CN 202310307884 A CN202310307884 A CN 202310307884A CN 116054433 B CN116054433 B CN 116054433B
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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
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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
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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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
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a mobile wireless charging transmitting terminal, which comprises a working circuit, a shell, a first track, a second track, a power module and a functional coil group, wherein the working circuit is arranged on the shell; the power module comprises a metal plate and a transmitting coil; the first rail is slidably arranged between the two second rails; the power module is slidably arranged on the first track; the functional coil group comprises a plurality of functional coils; any two adjacent functional coils are overlapped, and the width of the overlapped area accounts for two thirds of the width of the functional coils; the functional coil extends along the direction of the first track and the second track; when the motor needs to move, three-phase alternating current with the phase difference of 120 DEG is input to at least the functional coils on the moving path. The traction force is generated through the electromagnetic field generated after the functional coil is electrified, so that the movement of the transmitting end is realized, no additional motor drive is needed, the cost is low, and the structure is simple and firm. The functional coil also has the functions of detecting the position of the receiving coil and detecting foreign matters, and one part is multipurpose.
Description
Technical Field
The invention relates to the field of wireless charging, in particular to a mobile wireless charging transmitting terminal.
Background
The accurate alignment of the wireless charging transmitting coil and the receiving coil ensures efficient power transmission, and when the transmitting coil and the receiving coil have larger offset, the transmission power, the efficiency and the like of the wireless charging system are obviously reduced; particularly when the offset exceeds a certain range, a situation in which charging is impossible occurs due to low electromagnetic coupling between the transmitting coil and the receiving coil. Meanwhile, if metal foreign matters exist between the transmitting coil and the receiving coil, wireless charging work can be affected, and potential safety hazards can be caused.
In the prior art, a movable transmitting end is provided to solve the alignment problem, but an additional driving motor is often required, which increases the equipment cost and the complexity of the system.
Disclosure of Invention
The invention provides a mobile wireless charging transmitting terminal, which can complete the movement of the transmitting terminal without an additional motor and ensure the alignment of wireless charging.
Portable wireless transmitting terminal that charges, operating circuit still includes: the device comprises a shell, a first track, a second track, a power module and a functional coil group; wherein the power module comprises a metal plate and a transmitting coil; the second rails are provided with two oppositely arranged rails and are respectively arranged in the shell, and the first rail is slidably arranged between the two second rails; the power module is slidably arranged on the first track, and the functional coil group comprises a plurality of functional coils; any two adjacent functional coils are overlapped, and the width of the overlapped area accounts for two thirds of the width of the functional coils; the functional coil extends along the direction of the first track and also extends along the direction of the second track; when the motor needs to move, three-phase alternating current with the phase difference of 120 DEG is input to at least the functional coils on the moving path.
Preferably, the device further comprises an excitation circuit and a switch module, wherein the switch module comprises a plurality of independent switches, each functional coil is communicated with the excitation circuit through a corresponding independent switch, and the excitation circuit inputs three-phase alternating current with the phase difference of 120 degrees to the functional coils.
Preferably, all the functional coils are arranged in groups of 3, and the phases of currents input by the three functional coils in each group are different by 120 degrees; in each group, when the current of any one of the functional coils reaches the maximum value, the currents of the other two functional coils are opposite to each other.
Preferably, the frequency of the three-phase alternating current is f3, and the functional coil whose current reaches the maximum value is changed every time 1/(3×f3) time elapses.
Preferably, the method further comprises: an acquisition circuit; the functional coil group is also used for detecting a receiving coil and foreign matters; the switch module comprises a plurality of independent switches, and each functional coil and the excitation circuit form a detection loop through a corresponding independent switch; the switch module controls the on-off of each detection loop; the acquisition circuit acquires the electrical parameters of each detection loop, and judges whether a receiving coil exists, the position of the receiving coil exists or not and whether metal foreign matters exist or not according to the electrical parameters.
Preferably, the acquisition circuit acquires the electrical parameters, and at least the impedance value of the functional coil can be obtained; comparing the impedance value with a basic impedance value to judge whether a receiving coil is arranged in the area where the functional coil group is arranged or not and whether metal foreign matters are arranged or not; wherein the base impedance value is divided into four: a first base impedance, a transmitting coil is arranged below the functional coil, and a comprehensive impedance value is arranged above the functional coil when the receiving coil is not arranged; a second base impedance, the function coil has no transmitting coil below, and the function coil has no comprehensive impedance value when the receiving coil above; a third base impedance, wherein a transmitting coil is arranged below the functional coil, and a comprehensive impedance value when a receiving coil is arranged above the functional coil; and the fourth base impedance, the transmitting coil is not arranged below the functional coil, and the comprehensive impedance value when the receiving coil is arranged above the functional coil.
Preferably, the acquisition circuit acquires that the receiving coil is not in the state that the impedance value of the functional coil is at the first basic impedance value or the second basic impedance value; when the acquisition circuit acquires that the impedance value of the functional coil is in the third basic impedance value or the fourth basic impedance value, the receiving coil is judged, and the relative position of the receiving coil can be judged according to the position of the functional coil; when the acquisition circuit acquires that the impedance value of the functional coil is not in the basic impedance value, the acquisition circuit judges that the metal foreign matters exist above the functional coil.
Preferably, the independent switch is sequentially connected with a detection loop, the excitation circuit loads a first alternating current signal in the connected detection loop, and the acquisition circuit at least acquires the equivalent impedance value of the functional coil in the detection loop.
Preferably, when the receiving coil is judged to be present, the detection loop in which the corresponding functional coil is positioned is sequentially connected, and the exciting circuit loads a second alternating current signal in the connected detection loop to enable the functional coil to generate an alternating magnetic field, and the receiving coil induces the alternating magnetic field to generate induced voltage and feeds back the intensity of the induced voltage; the frequency of the second alternating current signal is a frequency which is satisfied to enable the receiving coil to generate induced voltage.
The mobile wireless charging transmitting terminal generates traction force through the electromagnetic field generated after the functional coil is electrified, so that the transmitting terminal is moved, no additional motor drive is needed, the cost is low, and the structure is simple and firm. Meanwhile, the functional coil also has the functions of detecting the position of the receiving coil and detecting foreign matters, and one part is multipurpose.
Drawings
FIG. 1 is a schematic diagram of a mobile wireless charging transmitting terminal according to the present invention;
FIG. 2 is an exploded view of a power module in a mobile wireless charging transmitting terminal according to the present invention;
FIG. 3 is a circuit diagram of functional coils in the mobile wireless charging transmitting terminal of the present invention;
FIG. 4 is a schematic diagram of a functional coil structure in a mobile wireless charging transmitting terminal according to the present invention;
FIG. 5 is a schematic diagram of the arrangement of functional coils in the mobile wireless charging transmitting terminal according to the present invention;
FIG. 6 is a graph showing the current change of the A coil, the B coil and the C coil in the mobile wireless charging transmitting terminal;
FIG. 7 is a schematic diagram of a traveling wave magnetic field on a metal plate in a mobile wireless charging transmitting terminal according to the present invention;
FIG. 8 is a schematic diagram of the current direction on the metal plate in the mobile wireless charging transmitting terminal according to the present invention;
FIG. 9 is a diagram showing an arrangement of functional coils in a mobile wireless charging transmitting terminal according to the present invention;
fig. 10 is another arrangement of functional coils in the mobile wireless charging transmitting terminal of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The present invention provides a mobile wireless charging transmitting terminal (hereinafter referred to as transmitting terminal) capable of detecting the position of a receiving coil and aligning the receiving coil and the transmitting coil by moving the transmitting terminal when the receiving coil and the transmitting coil are not aligned.
As shown in fig. 1 and 2, the transmitting terminal includes an operating circuit, and a first rail 1, a second rail 2, a housing 0, a power module 3, and a functional coil group 6. The power module 3 includes a metal plate 4, a transmitting coil 5, a shielding plate, and the like. The operating circuit includes a rectifying circuit, an inverter circuit, and the like.
The above-mentioned power module 3 is mainly a main component for performing a wireless charging function, the first rail 1, the second rail 2, and the functional coil group 6 are main portions for enabling the transmitting coil 5 to move, and the metal plate 4 also participates in realizing the moving function.
In addition to this, the transmitting end is provided with an acquisition circuit 9 and the like, and can detect the receiving coil and the metallic foreign matter. When the receiving coil is detected, the position of the receiving coil is determined, thereby enabling the transmitting end to be moved more efficiently for alignment. When the metal foreign matter is detected, wireless charging can be stopped in time.
The material of the housing 0 is generally engineering plastic, and the housing 0 mainly plays a role in packaging and improving mechanical strength. The components may be layered within the housing 0, as shown in fig. 1, with the top layer being the functional coil assembly 6 and the next layer being the power module 3, with the transmit coil 5 being at this layer, and the transmit coil 5 being visible below the functional coil assembly 6. The first track 1 and the second track 2 may be counted as bottom layers, typically the second track 2 is formed on the inner wall of the housing 0, and the first track 1 may pass at the bottom of the power module 3 or in the middle of the power module 3, on the one hand to support the power module 3 and on the other hand to provide a path for movement thereof. As in fig. 1, the power module 3 has a housing, through which the first rail 1 passes. While the functional coil group 6 covers an area larger than the area of the transmitting coil 5. The functional coil assembly 6 also has a housing in fig. 1, in which the housing area of the functional coil assembly 6 is smaller than the housing area of the power module 3, and the area relationship between the functional coil assembly 6 and the transmitting coil 5 is not shown. And in order to better illustrate the parts, the functional coil assembly 6 is prevented from shielding the lower parts, so that the area of the lower parts is reduced or a part of the lower parts is hidden for illustration. In practical application, the area of the functional coil group 6 is large enough, and the transmitting coil 5 can be moved to any position, so that the functional coil group 6 can cover the transmitting coil. As shown in fig. 2, the housing of the power module 3 may be divided into upper and lower parts, and other parts may be provided therein in addition to the metal plate 4 and the transmitting coil 5. Other necessary components are also included in the power module 3. Besides the main components, the shielding plate is arranged at the lower side of the transmitting coil 5, the winding of the transmitting coil 5 is generally wound by a high-frequency litz wire, and the shielding plate is generally made of high-permeability materials such as nanocrystalline or ferrite.
Below the shielding plate is the above-mentioned metal plate 4, and the metal plate 4 may be of aluminum material, which further plays a role in electromagnetic field shielding and heat conduction in addition to the above-mentioned use for movement. The metal plate 4 has an area larger than that of the transmitting coil 5 and extends at least in one dimension to both ends of the transmitting coil 5. The shielding plate and the metal plate 4 are not shown in fig. 1 and 2.
The second rails 2 have two oppositely disposed, and the first rail 1 is slidably disposed between the two second rails 2, and preferably, the first rail 1 and the second rail 2 are perpendicular to each other. The power module 3 is slidably arranged on said first rail 1, the power module 3 being slidable along the extension direction of the first rail 1, i.e. a movement of the transmitter coil 5 in the first direction is achieved. The sliding of the first track 1 between the second tracks 2 indirectly effects a movement of the transmitter coil 5 in the second direction.
The transmitting coil 5, the functional coil group 6, the first track 1, the second track 2 and other parts are all arranged in the shell 0, and the transmitting coil 5 and the receiving coil can be aligned by the movement of the power module 3. The motive power for the movement is provided by the functional coil assembly 6, to which of course electrical energy is required to be input. The functional coil assembly 6 may not move with the power module 3.
The following describes a specific moving mode, and then explains the principle of detecting the receiving coil and detecting the metallic foreign matter. The functional coil group 6 includes a plurality of functional coils; two adjacent functional coils are overlapped, and the width of the overlapped area accounts for two thirds of the width of the functional coils; referring to fig. 4 and 5, the functional coils are arranged in series like a tile, being overlapped with each other in one dimension direction, with a partial area overlap between one functional coil and the next, and if the width of the functional coil is L, the second functional coil in the overlapping direction overlaps at 1/3L of the first functional coil, and the length of the overlapping portion of the two functional coils is 2/3L. The third detection function coil is overlapped at 2/3L of the first function coil (also at 1/3L of the second function coil), the length of the overlapped part of the first function coil and the third function coil is 1/3L, and the length of the overlapped part of the second function coil and the third function coil is 2/3L. The overlap here is mainly to ensure the function of movement. In fig. 5, part of the functional coils are hidden for convenience of marking. The functional coils in fig. 4 and 5 are merely examples, and are not limited to the structure of the functional coils.
The functional coil extends in the direction of the first track 1 and also in the direction of the second track 2; when the motor needs to move, three-phase alternating current with the phase difference of 120 DEG is input to at least the functional coils on the moving path.
The energizing circuit 7 and the switch module 8 realize the energizing, the switch module 8 comprises a plurality of independent switches, each functional coil is respectively communicated with the energizing circuit 7 through a corresponding independent switch, and the energizing circuit 7 inputs three-phase alternating current with 120 DEG phase difference to the communicated functional coils.
When the movement is required, three-phase alternating current with a phase difference of 120 degrees is supplied to the functional coils in the direction to be moved (the required functional coils are communicated with the exciting circuit 7 through independent switches), and for example, the functional coils extending along the direction of the first track 1 are required to be supplied with electricity along the first direction. Note that the first direction and the second direction cannot move simultaneously, and it is necessary to perform movement in one direction and then move in the other direction after completing the movement in the other direction.
The functional coils to which the three-phase alternating current is injected include at least the functional coils above the transmitting coil 5, and also include a plurality of functional coils surrounding the functional coils above the transmitting coil in order to ensure an effective movement effect. All of these functional coils are grouped into one group (every 3 groups) every adjacent three functional coils in the moving direction, and the phases of the currents input into the three functional coils of each group are 120 degrees different.
For ease of understanding, as shown in fig. 3, 4 and 5, we denote three functional coils in a group, denoted A, B, C, and referred to as a coil, B coil and C coil. Referring to fig. 6, the ordinate is current, and the abscissa is time, when the current value of the a coil reaches a positive maximum value, the current values of the B coil and the C coil are opposite (the current directions are opposite) to each other, and are 1/2 of the negative maximum value, that is, the current values of the B coil and the C coil are opposite to each other, and are 1/2 of the current value of the a coil, at this time, a magnetic field with the largest amplitude is generated on the axis of the a coil, and a magnetic field is generated between the B coil on one side of the a coil and the C coil next adjacent to the B coil, and between the C coil on the other side of the a coil and the B coil adjacent to the C coil. In short, it is between the adjacent B coil and C coil on the right side of the A coil, and between the adjacent C coil and B coil on the left side of the A coil.
As can be seen from the above, the current phases of all the a coils are the same, the current phases of all the B coils are the same, and the current phases of all the C coils are the same, so that the functional coils using the same current phases can be divided into one group by the switch module 8, i.e. in fig. 3, the switch module 8 is provided with three groups of switches including the switch K1, the switch K2 and the switch K3, the a coil is connected with the switch K1, the B coil is connected with the switch K2, the C coil is connected with the switch K3, and the switches K1, K2 and K3 are respectively connected with three ports of the excitation circuit 7. Of course, the switches K1, K2, K3 include respective corresponding independent switches, that is, the switches K1, K2, K3 correspond to the independent switches connected to the a coil, the B coil, and the C coil, respectively, so as to ensure that each coil can be independently controlled, and the coils are grouped, because the current phases used are the same, and the excitation circuit 7 can provide excitation currents with the same phase for the same group, so that the groups are conveniently controlled.
According to the above, a magnetic field is generated on the function coil to which alternating current is applied, the magnetic field being sinusoidally distributed in a straight line direction; when the current of the coil A reaches the maximum value, after t=1/(3×f3) time (wherein f3 is the frequency of the three-phase alternating current), the current of the coil B reaches the maximum value, at this time, the current of the coil C and the current of the coil A are both 1/2 of the negative maximum value, and the maximum amplitude of the magnetic field is transferred to the axis of the coil B; after t=2/(3×f3) time, when the C-coil current reaches the maximum value, both the a-coil and the B-coil and the current are 1/2 of the negative maximum value, and the maximum amplitude of the magnetic field is turned onto the C-coil axis again. It follows that when the three-phase current changes with time, the amplitude of the magnetic field moves in a straight line in the order of the a-coil, the B-coil, and the C-coil, and thus this translational magnetic field can be referred to as a traveling wave magnetic field.
The travelling wave magnetic field will generate an induced current on the metal plate 4, and fig. 7 and 8 illustrate the principle that the transmitting coil generates electromagnetic thrust under the action of the travelling wave magnetic field. Reference is made to the following diagram, wherein the sine waveform in fig. 7 is the travelling magnetic field generated by the functional coil, the direction of the current on the metal plate 4 is shown by a solid line, the travelling magnetic field generated by the functional coil to which alternating current is applied in the figure is shown by an N pole in the forward amplitude, and by an S pole in the reverse amplitude, and the direction of the induced current generated by the metal plate 4 is shown in fig. 8. The metal plate 4 is in the travelling wave magnetic field and is cut by the travelling wave magnetic field in translation, the metal plate 4 is equivalent to the parallel arrangement of an infinite number of electrified metal conductor bars, the direction of electromagnetic thrust can be judged according to the magnetic field and the current direction and according to the left hand rule, and the electromagnetic thrust generated on all the metal conductor bars and the travelling wave magnetic field moving direction are the same direction, and the superposition effect of the electromagnetic thrust generated on all the metal conductor bars is equivalent to the metal plate 4, so that the metal plate 4 can do linear motion along the travelling wave magnetic field moving direction and drive the power module 3 to move. Vs in fig. 7 indicates the direction of movement.
If the moving direction is to be switched, the phase sequence of any two phases of the input three-phase alternating current is switched, the generated travelling wave magnetic field can also move reversely, and the corresponding moving direction can also be reversed. According to this principle, linear reciprocating motion can be achieved.
If the power transmission coil needs to move along the first direction, three-phase alternating current is fed to the overlapped functional coils above the transmitting coil 5 along the first direction; the transmitting coil 5 needs to be moved in the second direction, and only the three-phase alternating current is supplied to the functional coils overlapping in the second direction above the transmitting coil 5, and the transmitting coil 5 is moved to the lower side of the functional coils overlapping in the second direction because the number of the functional coils overlapping in the second direction may be smaller than that of the functional coils overlapping in the first direction. The moving direction is consistent with the moving speed of the travelling magnetic field, the moving speed of the whole travelling magnetic field is synchronous but slightly lower than the moving speed of the travelling magnetic field, the moving speed of the travelling magnetic field is determined by the frequency f3 of the input three-phase alternating current and the length of the functional coil, and the travelling magnetic field and the moving speed can be adjusted by setting and adjusting the two values.
Note that the above-described reason why the transmitting coil 5 is moved to the position below the functional coils overlapped in the second direction is that the number of functional coils overlapped in the second direction is smaller than that of functional coils overlapped in the first direction, so that it is necessary to move to the position below the functional coils overlapped in the second direction. This can save the amount of use of the functional coil. It can be seen from fig. 9 that in the first direction there are significantly more functional coils that overlap, and that in any position there is a functional coil that overlaps in the first direction, either the power module 3 or the transmitter coil 5, so that it can be moved in the first direction in any position. And the functional coils overlapping in the second direction have only the first column, so that the transmitting coil 5 has to be moved to the first column first when it is necessary to move in the second direction. I.e. first in a first direction and then in a second direction.
If the arrangement is such that the functional coils are all overlapped in both the first direction and the second direction as shown in fig. 10, the transmitting coil 5 may be moved regardless of the order of the moving directions. Except that this approach requires the use of more functional coils.
The detection receiving coil and the metallic foreign matter will be described below.
The functional coil group 6, the exciting circuit 7, the collecting circuit 9 and the switch module 8 are also used for detecting the receiving coil (whether the receiving coil is detected and the position of the receiving coil is detected), and detecting the metal foreign matter (whether the metal foreign matter is detected and the position of the metal foreign matter is detected). The wireless charging device also comprises a transmitting end communication module which is used for transmitting information with a receiving end communication module, for example, when the wireless charging device has metal foreign matters, wireless charging is stopped.
As a transmitting end of the wireless energy, the transmitting coil 5 is connected to an ac conversion circuit and controlled by a controller, and the ac conversion circuit, the controller, etc. may be integrated in a housing of the transmitting end, whereas in the application case of high-power wireless charging, the ac conversion circuit and the controller may be independently arranged outside the housing 0 due to volume, heat dissipation, etc. The wireless charging transmitting end can charge a receiving device with a receiving coil, and the winding of the receiving coil is of a plane coiled single-coil structure. The shell surface of the wireless charging transmitting terminal is provided with a chargeable area, the size of the chargeable area is larger than that of the receiving coil, and when the receiving device is placed in the chargeable area, the receiving device can be identified by the wireless charging transmitting terminal to start the wireless charging function.
The functional coil assembly 6 is sized to cover the chargeable area. The chargeable area means that the transmitting coil 5 can be coupled with the receiving coil to charge the device to be charged when the device to be charged with the receiving means is placed in the area.
As described above, the functional coil group 6 includes a plurality of functional coils, and the switch module 8 includes a plurality of independent switches therein, and each of the functional coils is respectively communicated with the exciting circuit 7 through a corresponding independent switch, and constitutes a circuit, called a detection circuit, capable of detecting the receiving coil and the metallic foreign matter. Namely an excitation circuit 7, an independent switch and a functional coil, and forms a detection loop. The acquisition circuit 9 acquires the electrical parameters of each detection loop, and judges whether a receiving coil exists, the position of the receiving coil exists or not and whether metal foreign matters exist or not according to the electrical parameters. At least the impedance of the functional coil can be obtained from the acquired electrical parameters. The acquisition circuit may be connected in series in the detection circuit, or other connection or measurement methods may be adopted, so long as the electrical parameters in each detection circuit can be obtained, and the invention is applicable. The acquisition circuit 9 generally includes functional components (functional circuits) such as a filter (filter circuit) and a measurer (measurement circuit).
The excitation circuit 7 is shared, so that the function of the independent switch is to ensure that the specified detection circuit can be operated each time, and in general, the independent switch does not simultaneously connect all the functional coils to the excitation circuit 7 and does not simultaneously operate all the detection circuits. (of course, if necessary, multiple independent switches may be closed simultaneously, and multiple detection loops may be operated simultaneously).
In actual operation, each detection loop is normally connected in sequence to obtain the impedance of each functional coil, so as to judge whether a receiving coil and a metal foreign body exist at the position of the functional coil. The position of the receiving coil and the position where the metallic foreign matter exists can be known by judging the plurality of functional coils.
Meanwhile, as described above, each of the change-over switches (K1, K2, K3) includes a respective independent switch therein, which is connected to each of the functional coils. The other end of the functional coil is connected in parallel to the other port of the excitation circuit 7.
When the independent switch is turned on, the function coil connected to the independent switch is turned on with the excitation circuit 7, and the output of the excitation circuit 7 is applied to both ends of the function coil.
When the detection circuit works, each independent switch is sequentially connected, so that the detection circuit can work, the acquisition circuit 9 acquires electric signals, and then an equivalent impedance value of each functional coil is obtained, and the impedance value is compared with a predetermined reference impedance value.
When the transmitting coil 5 is moved, the exciting circuit 7 inputs an alternating current with a frequency f3 and a phase difference of 120 ° for a group of three functional coils, and when the exciting circuit 7 is used as a detection circuit, the exciting circuit 7 loads a first alternating signal with a frequency f1 on the functional coils which are connected, collects the electric parameters of the connected detection circuit, and measures the equivalent impedance value and the change thereof of the functional coils by measuring the amplitude and the phase of the current, for example.
The first ac signal loaded by the exciting circuit 7 is the working frequency used when the collecting circuit 9 collects the impedance value. The acquisition circuit 9 is arranged below the transmitting coil, i.e. integrated in the wireless charging transmitting end housing, and the acquisition circuit 9 may also integrate the functional components therein in whole or in part in the controller. Typically only one functional coil is connected to both ends of the excitation circuit 7 at a time, i.e. only one detection circuit is in communication.
The basic impedance values are divided into four: a first base impedance, a transmitting coil 5 is arranged below the functional coil, and a comprehensive impedance value is arranged above the functional coil when the receiving coil is not arranged; a second base impedance, the function coil has no transmitting coil 5 below, and the function coil has no comprehensive impedance value when the receiving coil above; a third base impedance, a transmitting coil 5 is arranged below the functional coil, and a comprehensive impedance value when a receiving coil is arranged above the functional coil; and the fourth base impedance, the transmitting coil 5 is not arranged below the functional coil, and the comprehensive impedance value when the receiving coil is arranged above the functional coil.
The four basic impedance values may be acquired in advance under corresponding conditions, that is, acquired using the above-described structure, or may be calculated by theory and then manually given.
The acquisition circuit 9 judges that no receiving coil exists when the impedance value of the functional coil is in the first basic impedance value or the second basic impedance value; when the impedance value is in the third basic impedance value or the fourth basic impedance value, judging that the receiving coil is arranged, and judging the relative position of the receiving coil according to the position of the functional coil; when the impedance value is not in the basic impedance value, the functional coil is judged to have metal foreign matters above. In general, when the obtained impedance value is compared with the four basic impedance values, a fault tolerance range, typically about 5%, can be set.
The metal object can be equivalent to a coil structure, so that the impedance value detected by the functional coil can be changed, and the impedance value change generally deviates from 4 basic impedance values, and the metal object appearing above the functional coil is equivalent to 'foreign matters' outside the wireless charging system, and does not belong to the transmitting end nor the receiving end. The metal foreign matter in the wireless charging power transmitting magnetic field may generate heat due to eddy effect, even ignite inflammables, and may cause loss of transmission power. When the metal foreign matter is found above the functional coil, particularly when the metal foreign matter is near the receiving coil, the charging is stopped, an alarm is sent, and the standby detection state can be re-entered after the metal foreign matter is cleaned.
When the plurality of functional coils detect that the receiving coil is arranged above, the plurality of functional coils are arranged in an overlapping mode, and the plurality of functional coils are positioned at adjacent positions, so that whether the detection of the positions of the receiving coils is correct can be verified and judged. Further, after determining that the receiving coil exists, all the detecting loops are disconnected, then the detecting loops where the functional coil, which is just judged to have the receiving coil above, is connected in sequence by the independent switch, the exciting circuit 7 loads the second alternating current signal with the frequency f2 at two ends of the functional coil, an alternating magnetic field is generated on the functional coil, the receiving coil senses the magnetic field to generate an induced voltage, a corresponding device detects the intensity of the induced voltage at the receiving end, and the signal intensity can be reported to the wireless charging transmitting end through a wireless communication link, if the signal intensity meets the preset requirement, the receiving device to be charged above the functional coil can be further determined. Wherein the excitation circuit 7 loads the frequency f2 of the second alternating current signal to a frequency which enables the receiving device to generate an induced voltage.
When the position of the receiving coil is determined and the receiving coil is not above the transmitting coil 5, the position of the transmitting coil 5 is aligned with the receiving coil using the above-described movement.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (9)
1. The utility model provides a portable wireless transmitting terminal that charges, includes work circuit, its characterized in that still includes:
the device comprises a shell (0), a first track (1), a second track (2), a power module (3) and a functional coil group (6); wherein the power module (3) comprises a metal plate (4) and a transmitting coil (5);
the second rails (2) are provided with two oppositely arranged rails and are respectively arranged in the shell (0), and the first rail (1) is slidably arranged between the two second rails (2);
the power module (3) is slidably arranged on the first track (1);
the functional coil group (6) includes a plurality of functional coils; any two adjacent functional coils are overlapped, and the width of the overlapped area accounts for two thirds of the width of the functional coils; the functional coil extends in the direction of the first rail (1) and also in the direction of the second rail (2);
when the motor needs to move, three-phase alternating current with the phase difference of 120 DEG is input to at least the functional coils on the moving path.
2. The mobile wireless charging transmitter of claim 1, wherein,
the three-phase alternating current power supply circuit further comprises an excitation circuit (7) and a switch module (8), wherein the switch module (8) comprises a plurality of independent switches, each functional coil is communicated with the excitation circuit (7) through a corresponding independent switch, and the excitation circuit (7) inputs three-phase alternating current with the phase difference of 120 degrees to the functional coils.
3. The mobile wireless charging transmitter of claim 1, wherein,
all the functional coils are arranged in groups of 3, and the phases of currents input by the three functional coils in each group are different by 120 degrees;
in each group, when the current of any one of the functional coils reaches the maximum value, the currents of the other two functional coils are opposite to each other.
4. The mobile wireless charging transmitter of claim 3, wherein,
the frequency of the three-phase alternating current is f3, and the functional coil with the current reaching the maximum value is converted into one coil after the time of 1/(3×f3).
5. The mobile wireless charging transmitter of claim 2, wherein,
further comprises: an acquisition circuit (9);
the functional coil group (6) is also used for detecting a receiving coil and foreign matters;
the switch module (8) comprises a plurality of independent switches, and each functional coil and the excitation circuit (7) form a detection loop through a corresponding independent switch;
the switch module (8) controls the on-off of each detection loop;
the acquisition circuit (9) acquires the electric parameters of each detection loop, and judges whether a receiving coil exists, the position of the receiving coil exists or not and whether metal foreign matters exist or not according to the electric parameters.
6. The mobile wireless charging transmitter of claim 5, wherein,
the acquisition circuit (9) acquires the electrical parameters, and at least the impedance value of the functional coil can be obtained;
comparing the impedance value with a basic impedance value to judge whether a receiving coil is arranged in the area where the functional coil group (6) is arranged or not and whether metal foreign matters are arranged or not;
wherein the base impedance value is divided into four:
a first base impedance, a transmitting coil is arranged below the functional coil, and a comprehensive impedance value is arranged above the functional coil when the receiving coil is not arranged;
a second base impedance, the function coil has no transmitting coil below, and the function coil has no comprehensive impedance value when the receiving coil above;
a third base impedance, wherein a transmitting coil is arranged below the functional coil, and a comprehensive impedance value when a receiving coil is arranged above the functional coil;
and the fourth base impedance, the transmitting coil is not arranged below the functional coil, and the comprehensive impedance value when the receiving coil is arranged above the functional coil.
7. The mobile wireless charging transmitter of claim 6, wherein,
the acquisition circuit (9) acquires that the receiving coil is not needed when the impedance value of the functional coil is at a first basic impedance value or a second basic impedance value;
the acquisition circuit (9) acquires the impedance value of the functional coil to be in a third basic impedance value or a fourth basic impedance value, judges that the receiving coil is arranged, and can judge the relative position of the receiving coil according to the position of the functional coil;
and when the acquisition circuit (9) acquires that the impedance value of the functional coil is not in the basic impedance value, judging that the metal foreign matters exist above the functional coil.
8. The mobile wireless charging transmitter of claim 5, wherein,
the independent switch is sequentially connected with a detection loop, the excitation circuit (7) loads a first alternating current signal in the connected detection loop, and the acquisition circuit (9) at least acquires the equivalent impedance value of the functional coil in the detection loop.
9. The mobile wireless charging transmitter of claim 5, wherein,
when the receiving coil is judged to be present, the detection loop where the corresponding functional coil is located is sequentially connected, and the exciting circuit (7) loads a second alternating current signal in the connected detection loop to enable the functional coil to generate an alternating magnetic field, and the receiving coil induces the alternating magnetic field to generate induced voltage and feeds back the intensity of the induced voltage;
the frequency of the second alternating current signal is a frequency which is satisfied to enable the receiving coil to generate induced voltage.
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| CN116054433A (en) | 2023-05-02 |
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