CN211405575U - Wireless charging system - Google Patents
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- CN211405575U CN211405575U CN201921298586.9U CN201921298586U CN211405575U CN 211405575 U CN211405575 U CN 211405575U CN 201921298586 U CN201921298586 U CN 201921298586U CN 211405575 U CN211405575 U CN 211405575U
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Abstract
The utility model provides a wireless charging system, this wireless charging system includes: the wireless charging device comprises a wireless charging transmitting device, a relay transmitting device and a wireless charging receiving device. When the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, the impedance matching network circuit is adjusted according to the working frequency of the wireless charging transmitting device, so that the current of the alternating current is reduced, the magnetic field is generated by the second transmitting coil, when the first receiving coil induces the magnetic field generated by the second transmitting coil, the alternating current is generated, and the alternating current is converted into direct current to charge the wireless charging equipment. The embodiment of the utility model provides an in, through adjusting impedance matching network circuit for the electric current of alternating current reduces, can improve wireless charging system's electric energy transmission distance and transmission efficiency.
Description
Technical Field
The utility model relates to a technical field that charges especially relates to a wireless charging system.
Background
With the continuous development and progress of wireless charging technology, the wireless charging technology is gradually applied to various fields of our lives.
The current wireless charging technology often adopts the electromagnetic induction technology, electric energy transmitting terminal adopts the mode of tight coupling with the electric energy receiving terminal to charge for wireless battery charging outfit, strengthen magnetic field intensity through the volume of increase electric energy transmitting terminal coil and the electric current that flows through the coil, and then increase the transmission distance of electric energy, however, because the strong magnetic field can produce extra heat loss to the metal object around the electric energy receiving terminal, and the electric current of increase can make electric energy transmitting terminal coil produce the loss, cause the high temperature of wireless battery charging outfit and electric energy transmitting terminal coil, and the too high charging power that can reduce the electric energy receiving terminal of temperature, thereby lead to the transmission efficiency of electric energy to reduce. In addition, the volume of the coil at the electric energy transmitting end and the current flowing through the coil are increased, so that the maximum transmission distance of electric energy is only 45 millimeters, and the performance requirements of users cannot be met.
Therefore, how to improve wireless charging system's electric energy transmission distance and transmission efficiency is the utility model discloses the problem that awaits solution is urgent.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a wireless charging system to solve the problem that the electric energy transmission distance of the wireless charging system is short and the transmission efficiency is low in the prior art.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the utility model discloses a first aspect discloses a wireless charging system, wireless charging system includes: the wireless charging device comprises a wireless charging transmitting device, a relay transmitting device and a wireless charging receiving device;
the relay transmission device is arranged between the first transmitting coil of the wireless charging transmitting device and the first receiving coil of the wireless charging receiving device;
the relay transmission device comprises a second receiving coil, a second transmitting coil, an impedance matching network circuit and a magnetic shielding layer;
the second receiving coil and the second transmitting coil are both arranged on the magnetic shielding layer;
the second receiving coil is connected with the first transmitting coil in a loose coupling mode, and the second transmitting coil is connected with the first receiving coil in a tight coupling mode;
the impedance matching network circuit is connected with the second receiving coil and the second transmitting coil in parallel. When the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, the impedance matching network circuit is adjusted according to the working frequency of the wireless charging transmitting device, so that the current of the alternating current is reduced, and the magnetic field is generated through the second transmitting coil;
when the first receiving coil induces the magnetic field generated by the second transmitting coil, alternating current is generated, and the alternating current is converted into direct current to charge the wireless charging equipment.
Optionally, the impedance matching network circuit includes: a first resonant capacitor and a second resonant capacitor;
one end of the second receiving coil is connected with one end of the second transmitting coil in series, the second receiving coil is connected with the first resonant capacitor in parallel, one end of the first resonant capacitor is connected with one end of the second resonant capacitor in series, and the other end of the second resonant capacitor is connected with the other end of the second transmitting coil in series;
when the second receiving coil induces a magnetic field generated by the first transmitting coil, alternating current is generated, capacitance values of the first resonance capacitor and the second resonance capacitor are adjusted according to the working frequency of the wireless charging and transmitting device, and when a resonance frequency point corresponding to the capacitance values of the first resonance capacitor and the second resonance capacitor approaches the working frequency, the current of the alternating current is reduced, and the magnetic field is generated through the second transmitting coil.
Optionally, the impedance matching network circuit further includes: a third resonant capacitor;
one end of the second receiving coil is connected with one end of the second transmitting coil in series, the second receiving coil is connected with the third resonant capacitor in parallel, and the third resonant capacitor is connected with the second transmitting coil in parallel;
when the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated; adjusting the capacitance value of the third resonant capacitor according to the working frequency of the wireless charging and transmitting device; when the resonant frequency point corresponding to the capacitance value of the third resonant capacitor approaches the working frequency, the current of the alternating current is reduced, and a magnetic field is generated through the second transmitting coil.
Optionally, the impedance matching network circuit further includes: a fourth resonant capacitor, a fifth resonant capacitor and a sixth resonant capacitor;
the second receiving coil is connected with the fourth resonant capacitor in parallel, one end of the second receiving coil is connected with one end of the fifth resonant capacitor in series, the other end of the second receiving coil is connected with one end of the sixth resonant capacitor in series, the other end of the fifth resonant capacitor is connected with one end of the second transmitting coil in series, and the other end of the sixth resonant capacitor is connected with the other end of the second transmitting coil in series;
when the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, and capacitance values of a fourth resonant capacitor, a fifth resonant capacitor and a sixth resonant capacitor are adjusted according to the working frequency of the wireless charging and transmitting device; when the resonant frequency point corresponding to the capacitance values of the fourth resonant capacitor, the fifth resonant capacitor and the sixth resonant capacitor approaches the working frequency, the current of the alternating current is reduced, and a magnetic field is generated through the second transmitting coil.
Optionally, the magnetic shielding layer includes: a first magnetism isolating sheet and a second magnetism isolating sheet;
the second receiving coil is arranged on the first magnetism isolating sheet, and the second transmitting coil is arranged on the second magnetism isolating sheet and used for shielding redundant magnetic fields around the wireless charging receiving device when the wireless charging receiving device charges the wireless charging equipment.
Optionally, the size of the second receiving coil is specifically set by a coupling coefficient between the first transmitting coil and the second receiving coil.
Based on the above, the embodiment of the utility model provides a wireless charging system and method, this wireless charging system includes: the wireless charging device comprises a wireless charging transmitting device, a relay transmitting device and a wireless charging receiving device. When the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, the impedance matching network circuit is adjusted according to the working frequency of the wireless charging transmitting device, so that the current of the alternating current is reduced, the magnetic field is generated by the second transmitting coil, when the first receiving coil induces the magnetic field generated by the second transmitting coil, the alternating current is generated, and the alternating current is converted into direct current to charge the wireless charging equipment. The embodiment of the utility model provides an in, through adjusting impedance matching network circuit for the electric current of alternating current reduces, can improve wireless charging system's electric energy transmission distance and transmission efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wireless charging system according to an embodiment of the present invention;
fig. 3 is a schematic side view of a relay transmission device according to an embodiment of the present invention;
fig. 4 is a schematic front view of a relay transmission device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a relay transmission device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another relay transmission device according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a wireless charging method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Known by the background art, among the prior art, the wireless charging technique often adopts the electromagnetic induction technique, electric energy transmitting terminal adopts the mode of tight coupling to charge for wireless battery charging outfit with the electric energy receiving terminal, the volume through increase electric energy transmitting terminal coil and the electric current that flows through the coil strengthen magnetic field intensity, and then increase the transmission distance of electric energy, however, the electric current of increase can make electric energy transmitting terminal coil produce the loss, cause the high temperature of wireless battery charging outfit and electric energy transmitting terminal coil, and then reduce the charging power of electric energy receiving terminal, thereby lead to the transmission efficiency of electric energy to reduce. In addition, the volume of the coil at the electric energy transmitting end and the current flowing through the coil are increased, so that the maximum transmission distance of electric energy is only 45 millimeters, and the performance requirements of users cannot be met.
Therefore, the embodiment of the utility model provides a wireless charging system and method, the transmission efficiency that can solve the electric energy reduces, and the transmission distance of electric energy can not satisfy the problem of user's performance demand.
The utility model discloses an electric energy can charge for the equipment that carries the battery such as handheld device, portable equipment or plate equipment.
Referring to fig. 1, for the embodiment of the utility model discloses a structural schematic diagram of wireless charging system, this structural schematic diagram of wireless charging system includes: the wireless charging transmission device 100, the relay transmission device 200, and the wireless reception device 300.
The relay transmission device 200 is disposed between the first transmitting coil Lp of the wireless charging transmitting device 100 and the first receiving coil Ls of the wireless charging receiving device 300.
The relay transmission device 200 includes a second receiving coil L1, a second transmitting coil L2, an impedance matching network circuit, and a magnetic shield layer (not shown in fig. 1).
It should be noted that the first receiving coil Lp, the first receiving coil Ls, the second receiving coil L1 and the transmitting coil L2 are all inductance coils, and the second receiving coil L1 and the transmitting coil L2 can be made by using a multi-strand litz wire or a flexible circuit board FPC form or other manufacturing processes.
The material of the magnetic shielding layer may be other magnetic shielding materials such as a ferrite soft magnetic sheet or a nanocrystalline soft magnetic sheet, which may be determined according to practical situations and is not limited in the present application.
The second receiving coil L1 and the second transmitting coil L2 are both disposed on a magnetic shield layer.
The second receiving coil L1 is connected to the first transmitting coil Lp by loose coupling, and the second transmitting coil L2 is connected to the first receiving coil Ls by tight coupling.
The impedance matching network circuit is connected in parallel with the second receiving coil L1 and the second transmitting coil L2.
When the second receiving coil L1 senses the magnetic field generated by the first transmitting coil Lp, an alternating current is generated, the impedance matching network circuit is adjusted according to the operating frequency of the wireless charging and transmitting device 100, so that the current of the alternating current is reduced, and the magnetic field is generated through the second transmitting coil L2.
Specifically, when the second receiving coil L1 senses a magnetic field generated by the first transmitting coil Lp, the electric energy is inductively coupled according to the electromagnetic induction principle, so as to generate an alternating current, the impedance matching network circuit is adjusted according to the operating frequency of the wireless charging and transmitting device 100, and when the resonant frequency point corresponding to the capacitance value of the impedance matching network circuit approaches the operating frequency, the impedance matching network circuit reaches the optimal impedance value, so that the current of the alternating current of the second transmitting coil L2 is reduced by 2-3 times, and the magnetic field is generated through the second transmitting coil L2.
The optimal impedance value is an impedance value of a circuit corresponding to the case where the capacitive reactance in the impedance matching network circuit is equal to the inductive reactance.
When the first receiving coil Ls induces the magnetic field generated by the second transmitting coil L1, an alternating current is generated, and the alternating current is converted into a direct current to charge the wireless charging device.
Specifically, when the first receiving coil Ls induces the magnetic field generated by the second transmitting coil L1, the electric energy is inductively coupled according to the electromagnetic induction principle, so as to generate an alternating current, and the alternating current is converted into a direct current to charge the wireless charging device.
The embodiment of the utility model provides an in, when the magnetic field that first transmitting coil produced is sensed to second receiving coil, produce the alternating current, according to the operating frequency of wireless emitter that charges, adjust impedance matching network circuit for the electric current of alternating current reduces, and produces magnetic field through second transmitting coil, produces the alternating current when first receiving coil senses the magnetic field that second transmitting coil produced, and changes the alternating current into the direct current and charge for wireless charging equipment. The utility model discloses an adjust impedance matching network circuit, impedance matching network circuit reaches the best impedance value for the electric current of alternating current reduces, can improve wireless charging system's electric energy transmission distance and transmission efficiency.
The embodiment of the utility model provides an in, LC cluster resonance circuit can be constituteed to second receiving coil L1, second transmitting coil L2 and impedance matching network circuit among the relay transmission device.
Based on the wireless charging system shown in fig. 1, the embodiment of the present invention further discloses specific structures of the LC series resonant circuit and the wireless charging receiving apparatus 300 in the wireless charging transmitting apparatus 100 and the relay transmission apparatus 200 shown in fig. 1, in specific implementations, as shown in fig. 3.
The wireless charging transmission device 100 includes: the constant voltage source U0 comprises a full bridge inverter circuit consisting of a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4, and an LC resonance circuit consisting of a first emitting coil Lp and a seventh resonance capacitor Cp.
One end of the constant voltage source U0 is connected to one end of the first switch S1, and the other end of the constant voltage source U0 is grounded.
The common connection terminal of the first switch S1 and the constant voltage source U0 is connected to one end of the second switch S2, and the other end of the first switch S1 is connected to one end of the third switch S3.
The other end of the third switch S3 is connected to one end of the fourth switch S4, the common connection end of the third switch S3 and the fourth switch S4 is grounded, and the other end of the fourth switch S4 is connected to the other end of the second switch S2.
A common connection terminal of the first switch S1 and the third switch S3 is connected to the first transmitting coil Lp, a common connection terminal of the second switch S2 and the fourth switch S4 is connected to the seventh capacitor Cp, and the first transmitting coil Lp is connected in series to the seventh capacitor Cp.
Optionally, the LC resonant circuit in the relay transmission device 200 includes: a second receiving coil L1, a second transmitting coil L2, a first resonant capacitor C1 and a second resonant capacitor C2.
One end of the second receiving coil L1 is connected in series with one end of the second transmitting coil L2, the second receiving coil L1 is connected in parallel with the first resonant capacitor C1, one end of the first resonant capacitor C1 is connected in series with one end of the second resonant capacitor C2, and the other end of the second resonant capacitor C2 is connected in series with the other end of the second transmitting coil L2.
Specifically, an inner diameter stub at one end of the second receiving coil L1 is connected to an outer diameter stub at one end of the second transmitting coil L2, a stub of the second receiving coil L1 is connected in parallel to the first resonant capacitor C1, one end of the first resonant capacitor C1 is connected in series with one end of the second resonant capacitor C2, and a stub at the other end of the second resonant capacitor C2 is connected in series with the other end of the second transmitting coil L2.
The wireless charge receiving apparatus 300 includes: a filter circuit formed by a receiving coil Ls, an eighth resonant capacitor Cs and a ninth resonant capacitor Cd of the wireless receiving device, a rectifying circuit formed by a load resistor R1, a first capacitor Cm, a second capacitor Cn, a third capacitor C, a fifth switch S5, a sixth switch S6, a seventh switch S7, a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3 and a fourth rectifying diode D4, and a battery.
One end of the first receiving coil Ls is connected in series with one end of the eighth resonant capacitor Cs, the other end of the first receiving coil Ls is connected in series with one end of the ninth resonant capacitor Cd, and the other end of the eighth resonant capacitor Cs is connected in series with the other end of the ninth resonant capacitor Cd.
The common connection end of the eighth resonant capacitor Cs and the ninth resonant capacitor Cd is connected with one end of a first capacitor Cm, the other end of the first capacitor Cm is connected with one end of a fifth switch S5, the common connection end of the first receiving coil Ls and the ninth resonant capacitor Cd is connected with one end of a second capacitor Cn, the other end of the second capacitor Cn is connected with one end of a sixth switch S6, the other end of the fifth switch S5 is connected with the other end of the sixth switch S6, the common connection end of the fifth switch S5 and the sixth switch S6 is connected with one end of a load resistor R1, and the other end of the load resistor R1 is grounded.
The common connection end of the eighth resonant capacitor Cs and the ninth resonant capacitor Cd is connected with the common connection end of the first rectifier diode D1 and the second rectifier diode D2, and the common connection end of the receiving coil Ls and the ninth resonant capacitor Cd of the wireless receiving device is connected with the common connection end of the third rectifier diode D3 and the fourth rectifier diode D4.
The anode of the first rectifying diode D1 is connected to the cathode of the second rectifying diode D2, the cathode of the first rectifying diode D1 is connected to the cathode of the third rectifying diode D3, the anode of the third rectifying diode D3 is connected to the cathode of the fourth rectifying diode D4, and the anode of the second rectifying diode D2 is connected to the anode of the fourth rectifying diode D4.
The positive pole and the negative pole of the battery are respectively provided with a binding post, and each binding post is respectively connected with a conducting wire. For convenience of description, a post provided at the positive electrode is referred to as a positive electrode post, and a post provided at the negative electrode is referred to as a negative electrode post.
The common connection end of the first rectifying diode D1 and the third rectifying diode D3 is connected with the positive terminal of the battery, and the common connection end of the second rectifying diode D2 and the fourth rectifying diode D4 is connected with the negative terminal of the battery.
It should be noted that the battery may be a lithium ion battery, a nickel cadmium rechargeable battery, a nickel hydrogen rechargeable battery, etc., and the present application is not limited thereto.
The constant voltage source U0 outputs constant direct current to the full-bridge inverter circuit, the full-bridge inverter circuit controls the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 to be closed, and the direct current is converted into alternating current with adjustable frequency and voltage. When the alternating current passes through the seventh resonant capacitor Cp and the first transmitting coil Lp, a varying magnetic field is generated above the first transmitting coil Lp.
Specifically, when alternating current passes through the first transmitting coil Lp and the seventh resonant capacitor Cp, the seventh resonant capacitor Cp discharges, the first transmitting coil Lp starts to have a reverse recoil current, the first transmitting coil Lp charges, when the voltage of the first transmitting coil Lp reaches the maximum, the seventh resonant capacitor Cp discharges, then the first transmitting coil Lp starts to discharge, and the seventh resonant capacitor Cp charges.
When the second receiving coil L1 in the relay transmission device located above the first receiving coil Lp induces the magnetic field generated by the first transmitting coil Lp, an alternating current is generated, the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 are adjusted according to the operating frequency of the wireless charging and transmitting device 100, and when the resonant frequency point corresponding to the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 approaches the operating frequency, the current of the alternating current is reduced, and the magnetic field is generated through the second transmitting coil L2.
Specifically, when the second receiving coil L1 in the relay transmission device located above the first receiving coil Lp induces the magnetic field generated by the first transmitting coil Lp, the electric energy is inductively coupled according to the electromagnetic induction principle, so as to generate an alternating current, the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 are adjusted according to the operating frequency of the wireless charging and transmitting device 100, when the resonant frequency point corresponding to the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 approaches the operating frequency, the impedance matching network circuit reaches the optimal impedance value, so that the current of the alternating current is reduced to 2-3 times of the current when the alternating current is generated by the first receiving coil Lp, and the magnetic field is generated by the second transmitting coil L2.
When the first receiving coil Ls induces the magnetic field generated by the second transmitting coil L1, the electric energy is inductively coupled according to the electromagnetic induction principle to generate an alternating current, the alternating current passes through the full-bridge rectification filter circuit to filter harmonic components to obtain a required alternating current, and the alternating current is converted into a direct current to charge the wireless charging device.
Specifically, when alternating current flows through the filter circuit, harmonic components are filtered to obtain required alternating current; the first rectifier diode D1, the second rectifier diode D2, the third rectifier diode D3 and the fourth rectifier diode D4 are turned on, the third capacitor C is charged while the alternating current flows through the load resistor R1, and when the voltage of the third capacitor C reaches the maximum voltage, the third capacitor C starts to discharge to the load resistor R1, so that the voltage flowing through the battery is relatively flat, that is, the alternating current is converted into direct current to charge the battery.
The embodiment of the utility model provides an in, when the magnetic field that first transmitting coil produced is sensed to second receiving coil, produce the alternating current, according to wireless emitter's that charges operating frequency, adjust first resonance electric capacity and second resonance electric capacity, when the resonant frequency point that the capacitance value of first resonance electric capacity and second resonance electric capacity corresponds approaches operating frequency, make the electric current of alternating current reduce, and produce magnetic field through second transmitting coil, produce the alternating current when first receiving coil senses the magnetic field that second transmitting coil produced, and convert the alternating current into the direct current and charge for wireless charging equipment. The utility model discloses in the capacitance value through adjusting impedance matching network circuit's first resonance electric capacity and second resonance electric capacity for the resonant frequency point that the capacitance value of first resonance electric capacity and second resonance electric capacity corresponds approaches operating frequency, makes the electric current of alternating current reduce, can improve wireless charging system's electric energy transmission distance and transmission efficiency, and makes the line loss of impedance network circuit minimum, and then improves wireless charging system's life.
Based on the LC series resonant circuit shown in fig. 2 described above. In a specific application, the second receiving coil L1 and the second transmitting coil L2 in the LC resonance circuit are both provided on a magnetic separator, as shown in fig. 4 and 5, and the relay transmission device includes a second receiving coil L1, a second transmitting coil L2, a first resonant capacitor C1, a second resonant capacitor C2, and a magnetic shield layer.
The magnetic shield layer includes: the first magnetism isolating sheet and the second magnetism isolating sheet.
The second receiving coil L1 is disposed on the first magnetism isolating sheet, and the second transmitting coil L2 is disposed on the second magnetism isolating sheet, that is, the positions of the second receiving coil L1 and the second transmitting coil L2 are separated, so that when the wireless charging receiving apparatus 300 charges the wireless charging device, the unnecessary magnetic field around the wireless charging receiving apparatus 300 is shielded.
The second receiving coil L1 and the second transmitting coil L2 are connected in series on the same plane through a lead a, a second resonant capacitor C2 is arranged between the lead a and the lead b and connected in parallel with the second receiving coil L1, a first resonant capacitor C1 is arranged on the lead b and connected with the second resonant capacitor C2, and a first resonant capacitor C1 is connected in series with the second transmitting coil L2.
Specifically, when the second receiving coil L1 induces the magnetic field generated by the first transmitting coil Lp, an alternating current is generated, and the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 are adjusted according to the operating frequency of the wireless charging and transmitting device 100; when the resonant frequency point corresponding to the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 approaches the operating frequency, the current of the alternating current is reduced, and a magnetic field is generated by the second transmitting coil.
Note that the diameter of the second receiving coil L1 is larger than the diameter of the second transmitting coil L2.
It should be noted that the size of the second receiving coil L1 is specifically determined by simulating the coupling coefficient between the first transmitting coil Lp and the second receiving coil L1 by electromagnetic simulation software, so that the coupling coefficient is maximized, thereby determining the size of the second receiving coil L1.
Further, since the second transmitting coil L2 and the first receiving coil Ls are connected by close coupling, the size of the second transmitting coil L2 is substantially the same as that of the first receiving coil Ls. So that the coupling coefficient between the second transmitting coil L2 and the first receiving coil Ls is maximized.
It should be noted that the diameters of the first magnetism isolating piece and the second magnetism isolating piece are slightly larger than the diameters of the second receiving coil L1 and the second transmitting coil L2.
The embodiment of the utility model provides an in, the magnetism isolating sheet among the relay transmission device can shield unnecessary magnetic field around the wireless receiving arrangement that charges, reduces wireless charging equipment's temperature lifting speed to overcome wireless charging equipment because the too high and slow problem of charging efficiency that leads to of temperature rise. Meanwhile, coupling coefficients between the first transmitting coil Lp and the second receiving coil L1, and between the second transmitting coil L2 and the first receiving coil Ls are maximized, which may further improve the charging efficiency of the wireless charging device.
In order to better explain the relay transmission device disclosed in the embodiment of the present invention, the following takes a wireless charging embodiment of a mobile phone as an example to specifically explain.
Assuming that the wireless charging transmitting device 100 can be disposed on a charger, the wireless charging receiving device 300 can be disposed on a mobile phone and connected to a battery in the mobile phone.
Second receiving coil L1 can be placed in the front of first magnetism isolating sheet among the relay transmission device, and the back of first magnetism isolating sheet can set up at the table back that has certain thickness, and the back of second magnetism isolating sheet is provided with second transmitting coil, and the back of second magnetism isolating sheet can be placed in the table top that has certain thickness.
The constant voltage source on the charger outputs constant direct current, and the direct current is converted into alternating current with adjustable frequency and voltage through a full-bridge inverter circuit of the wireless charging transmitting device. When an alternating current passes through the LC resonance circuit, a varying magnetic field is generated above the first radiation coil Lp.
When the second receiving coil L1 on the front surface of the first magnetism isolating sheet induces the magnetic field generated by the first transmitting coil Lp, the electric energy is inductively coupled according to the electromagnetic induction principle, so as to generate alternating current, and according to the working frequency of the wireless charging transmitting device 100, the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 are adjusted, when the resonant frequency point corresponding to the capacitance values of the first resonant capacitor C1 and the second resonant capacitor C2 approaches the working frequency, the capacitive reactance of the matching impedance circuit reaches the optimal impedance value, so that the current of the alternating current is reduced by 2-3 times, and the magnetic field is generated through the second transmitting coil L2.
When the mobile phone is placed above the front surface of the second magnetism-isolating sheet, the first receiving coil Ls of the wireless receiving device in the mobile phone induces the magnetic field generated by the first emitting coil L2 below the second magnetism-isolating sheet, so that alternating current is generated, and the alternating current is converted into direct current to charge the mobile phone battery.
The first magnetism isolating sheet and the second magnetism isolating sheet shield redundant magnetic fields around the mobile phone when the mobile phone is placed above the front side of the second magnetism isolating sheet.
The embodiment of the utility model provides an in, when placing the cell-phone on the second magnetism isolating sheet, first magnetism isolating sheet and second magnetism isolating sheet can be in shielding cell-phone unnecessary magnetic field around, and through setting up relay transmission device, can improve wireless charging system's electric energy transmission distance and transmission efficiency.
Based on the above-mentioned wireless charging system shown in fig. 2 disclosed in the embodiment of the present invention, as shown in fig. 5, optionally, the relay transmission device 200 includes a second receiving coil L1, a second transmitting coil L2, a third resonant capacitor C3, and a magnetic shielding layer (not shown in fig. 5).
One end of the second receiving coil L1 is connected in series with one end of the second transmitting coil L2, the second receiving coil L1 is connected in parallel with the third resonant capacitor C3, and the third resonant capacitor C3 is connected in parallel with the second transmitting coil L2.
When the second receiving coil L1 induces the magnetic field generated by the first transmitting coil Ls, an alternating current is generated, and the capacitance value of the third resonant capacitor C3 is adjusted according to the working frequency of the wireless charging and transmitting device 100; when the resonant frequency point corresponding to the capacitance value of the third resonant capacitor C3 approaches the operating frequency, the current of the alternating current is reduced, and a magnetic field is generated by the second transmitting coil L2.
The process of adjusting the capacitance value of the third resonant capacitor C3 in the impedance matching network circuit is the same as the process of adjusting the capacitance value of the impedance matching network circuit shown in fig. 2, and is not repeated here.
The embodiment of the utility model provides an in, through the capacitance value of adjusting impedance matching network circuit's third resonant capacitance for the resonant frequency point that third resonant capacitance's capacitance value corresponds approaches operating frequency, and impedance matching network circuit reachs the best impedance value, makes the electric current of alternating current reduce, can improve wireless charging system's electric energy transmission distance and transmission efficiency, and makes impedance matching network circuit's line loss minimum, and then improves wireless charging system's life.
Based on the above-mentioned wireless charging system shown in fig. 2 disclosed in the embodiment of the present invention, as shown in fig. 6, optionally, the relay transmission device 200 includes a second receiving coil L1, a second transmitting coil L2, a fourth resonant capacitor C4, a fifth resonant capacitor C5, a sixth resonant capacitor C6 and a magnetic shielding layer (not shown in fig. 6).
The second receiving coil L1 is connected in parallel with the fourth resonant capacitor C4, one end of the second receiving coil L1 is connected in series with one end of the fifth resonant capacitor C5, the other end of the second receiving coil L1 is connected in series with one end of the sixth resonant capacitor C6, the other end of the fifth resonant capacitor C5 is connected in series with one end of the second transmitting coil L2, and the other end of the sixth resonant capacitor C6 is connected in series with the other end of the second transmitting coil L2.
When the second receiving coil L1 induces the magnetic field generated by the first transmitting coil Lp, an alternating current is generated, and the capacitance values of the fourth resonant capacitor C4, the fifth resonant capacitor C5 and the sixth resonant capacitor C6 are adjusted according to the working frequency of the wireless charging and transmitting device 100; when the resonant frequency point corresponding to the capacitance values of the fourth resonant capacitor C4, the fifth resonant capacitor C5 and the sixth resonant capacitor C6 approaches the operating frequency, the current of the alternating current is reduced, and a magnetic field is generated by the second transmitting coil L2.
The process of adjusting the capacitance values of the fourth resonant capacitor C4, the fifth resonant capacitor C5, and the sixth resonant capacitor C6 in the impedance matching network circuit is the same as the process of adjusting the capacitance values of the impedance matching network circuit shown in fig. 2, and is not repeated here.
The embodiment of the utility model provides an in, through the fourth resonant capacitance who adjusts impedance matching network circuit, the capacitance value of fifth resonant capacitance and sixth resonant capacitance, make fourth resonant capacitance, the resonant frequency point that the capacitance value of fifth resonant capacitance and sixth resonant capacitance corresponds approaches operating frequency, impedance matching network circuit reachs best impedance value, make the electric current of alternating current reduce, can improve wireless charging system's electric energy transmission distance and transmission efficiency, and make impedance matching network circuit's line loss minimum, and then improve wireless charging system's life.
Based on the structures of the LC resonant circuits shown in fig. 2, 5 and 6, other structures of the LC resonant series-parallel circuit capable of making the impedance matching network circuit reach the optimal impedance value and reducing the current of the alternating current may be included, which is determined according to the actual situation, and the present application is not limited thereto.
Based on the foregoing the embodiment of the utility model provides a wireless charging system is disclosed, the embodiment of the utility model provides a still correspond and disclose a wireless charging method. As shown in fig. 7, a schematic flow chart of a wireless charging method is provided in an embodiment of the present invention. The wireless charging method comprises the following steps:
step S701: when the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, the impedance matching network circuit is adjusted according to the working frequency of the wireless charging transmitting device, so that the current of the alternating current is reduced, and the magnetic field is generated through the second transmitting coil.
Step S702: when the first receiving coil induces the magnetic field generated by the second transmitting coil, alternating current is generated, and the alternating current is converted into direct current to charge the wireless charging equipment.
It should be noted that, above-mentioned the utility model discloses the specific principle and the executive process of each step in the wireless charging method disclosed in the embodiment, with the aforesaid the utility model discloses implement wireless charging device the same, can refer to the aforesaid the utility model discloses corresponding part among the wireless charging device disclosed in the embodiment, no longer describe here.
The embodiment of the utility model provides an in, when the magnetic field that first transmitting coil produced is sensed to second receiving coil, produce the alternating current, according to wireless transmitting device's that charges operating frequency, adjust impedance matching network circuit for the electric current of alternating current reduces, and produces magnetic field through second transmitting coil. When the first receiving coil induces the magnetic field generated by the second transmitting coil, alternating current is generated, and the alternating current is converted into direct current to charge the wireless charging equipment. The utility model discloses in, through adjusting impedance matching network circuit, impedance matching network circuit reaches the best impedance value for the electric current of second transmitting coil alternating current reduces, can improve wireless charging system's electric energy transmission distance and transmission efficiency.
Based on the aforesaid the utility model discloses the impedance matching network circuit that the embodiment figure 2 discloses, impedance matching network circuit includes: a first resonant capacitor and a second resonant capacitor.
Therefore, above-mentioned the embodiment of the present invention shows step S701 specifically when the second receiving coil senses the magnetic field generated by the first transmitting coil, the ac power is generated, according to the operating frequency of the wireless charging transmitting device, the impedance matching network circuit is adjusted, so that the current of the ac power is reduced, and through the second transmitting coil, the magnetic field is generated, including:
when the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, and the capacitance values of the first resonant capacitor and the second resonant capacitor are adjusted according to the working frequency of the wireless charging and transmitting device.
When the resonant frequency point corresponding to the capacitance values of the first resonant capacitor and the second resonant capacitor approaches the working frequency, the current of the alternating current is reduced, and a magnetic field is generated through the second transmitting coil.
The embodiment of the utility model provides an in, through the capacitance value of adjusting first resonance electric capacity and second resonance electric capacity for the resonant frequency point that the capacitance value of first resonance electric capacity and second resonance electric capacity corresponds approaches operating frequency, makes the electric current of alternating current reduce, can improve wireless charging system's electric energy transmission distance and transmission efficiency, and makes impedance matching network circuit's line loss minimum, and then improves wireless charging system's life.
Based on above-mentioned the utility model discloses the impedance matching network circuit that the embodiment figure 5 discloses, this impedance matching network circuit includes: and a third resonant capacitor.
Therefore, above-mentioned the embodiment of the present invention shows step S701 specifically when the second receiving coil senses the magnetic field generated by the first transmitting coil, the ac power is generated, according to the operating frequency of the wireless charging transmitting device, the impedance matching network circuit is adjusted, so that the current of the ac power is reduced, and through the second transmitting coil, the magnetic field is generated, including:
when the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, the capacitance value of the third resonant capacitor is adjusted according to the working frequency of the wireless charging and transmitting device, and when the resonant frequency point corresponding to the capacitance value of the third resonant capacitor approaches the working frequency, the current of the alternating current is reduced, and the magnetic field is generated through the second transmitting coil.
The embodiment of the utility model provides an in, through adjusting the capacitance value of third resonant capacitor for the resonant frequency point that the capacitance value of third resonant capacitor corresponds approaches operating frequency, makes the electric current of alternating current reduce, can improve wireless charging system's electric energy transmission distance and transmission efficiency, and makes impedance matching network circuit's line loss minimum, and then improves wireless charging system's life.
Based on the aforesaid the utility model discloses the impedance matching network circuit that the embodiment of figure 6 is disclosed, impedance matching network circuit includes: a fourth resonant capacitor, a fifth resonant capacitor and a sixth resonant capacitor.
Therefore, above-mentioned the embodiment of the present invention shows step S701 specifically when the second receiving coil senses the magnetic field generated by the first transmitting coil, the ac power is generated, according to the operating frequency of the wireless charging transmitting device, the impedance matching network circuit is adjusted, so that the current of the ac power is reduced, and through the second transmitting coil, the magnetic field is generated, including:
when the second receiving coil induces the magnetic field generated by the first transmitting coil, alternating current is generated, and the capacitance values of the fourth resonant capacitor, the fifth resonant capacitor and the sixth resonant capacitor are adjusted according to the working frequency of the wireless charging and transmitting device.
When the resonant frequency points corresponding to the capacitance values of the fourth resonant capacitor, the fifth resonant capacitor and the sixth resonant capacitor approach the working frequency, the current of the alternating current is reduced, and a magnetic field is generated through the second transmitting coil.
The embodiment of the utility model provides an in, through the capacitance value of adjusting fourth resonant capacitor, fifth resonant capacitor and sixth resonant capacitor for the resonant frequency point that the capacitance value of fourth resonant capacitor, fifth resonant capacitor and sixth resonant capacitor corresponds approaches operating frequency, makes the electric current of alternating current reduce, can improve wireless charging system's electric energy transmission distance and transmission efficiency, and makes impedance matching network circuit's line loss minimum, and then improves wireless charging system's life.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A wireless charging system, comprising: the wireless charging device comprises a wireless charging transmitting device, a relay transmitting device and a wireless charging receiving device;
the relay transmission device is arranged between the first transmitting coil of the wireless charging transmitting device and the first receiving coil of the wireless charging receiving device;
the relay transmission device comprises a second receiving coil, a second transmitting coil, an impedance matching network circuit and a magnetic shielding layer;
the second receiving coil and the second transmitting coil are both arranged on the magnetic shielding layer;
the second receiving coil is connected with the first transmitting coil in a loose coupling mode, and the second transmitting coil is connected with the first receiving coil in a tight coupling mode;
the impedance matching network circuit is connected with the second receiving coil and the second transmitting coil in parallel; the second receiving coil is used for inducing the magnetic field generated by the first transmitting coil and generating alternating current to be input into the impedance matching network circuit; the second transmitting coil is used for converting the alternating current output by the impedance matching network circuit into a magnetic field;
the first receiving coil is used for inducing the magnetic field generated by the second transmitting coil and generating alternating current to supply power to the wireless charging receiving device.
2. The wireless charging system of claim 1, wherein the impedance matching network circuit comprises: a first resonant capacitor and a second resonant capacitor;
one end of the second receiving coil is connected with one end of the second transmitting coil in series, the second receiving coil is connected with the first resonant capacitor in parallel, one end of the first resonant capacitor is connected with one end of the second resonant capacitor in series, and the other end of the second resonant capacitor is connected with the other end of the second transmitting coil in series.
3. The wireless charging system of claim 1, wherein the impedance matching network circuit further comprises: a third resonant capacitor;
one end of the second receiving coil is connected with one end of the second transmitting coil in series, the second receiving coil is connected with the third resonant capacitor in parallel, and the third resonant capacitor is connected with the second transmitting coil in parallel.
4. The wireless charging system of claim 1, wherein the impedance matching network circuit further comprises: a fourth resonant capacitor, a fifth resonant capacitor and a sixth resonant capacitor;
the second receiving coil is connected with the fourth resonant capacitor in parallel, one end of the second receiving coil is connected with one end of the fifth resonant capacitor in series, the other end of the second receiving coil is connected with one end of the sixth resonant capacitor in series, the other end of the fifth resonant capacitor is connected with one end of the second transmitting coil in series, and the other end of the sixth resonant capacitor is connected with the other end of the second transmitting coil in series.
5. The wireless charging system of claim 1, wherein the magnetic shield layer comprises: a first magnetism isolating sheet and a second magnetism isolating sheet;
the second receiving coil is arranged on the first magnetism isolating sheet, and the second transmitting coil is arranged on the second magnetism isolating sheet and used for shielding redundant magnetic fields around the wireless charging receiving device when the wireless charging receiving device charges wireless charging equipment.
6. The wireless charging system of claim 1, wherein the second receiving coil is dimensioned specifically by a coupling coefficient between the first transmitting coil and the second receiving coil.
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| CN201921298586.9U CN211405575U (en) | 2019-08-12 | 2019-08-12 | Wireless charging system |
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| CN201921298586.9U CN211405575U (en) | 2019-08-12 | 2019-08-12 | Wireless charging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350636A (en) * | 2019-08-12 | 2019-10-18 | 广东工业大学 | A kind of wireless charging system and method |
| CN112615440A (en) * | 2020-12-25 | 2021-04-06 | 国网北京市电力公司 | Wireless power transmission device and wireless power transmission system |
| CN113472088A (en) * | 2021-07-09 | 2021-10-01 | 江苏东大集成电路系统工程技术有限公司 | Wireless charging method and wireless charging system |
| CN114475293A (en) * | 2021-12-22 | 2022-05-13 | 北京理工大学 | Position sensor-free electric automobile wireless charging automatic starting and guiding system |
| CN114661090A (en) * | 2022-05-19 | 2022-06-24 | 深之蓝(天津)水下智能科技有限公司 | Method and system for self-adaptively acquiring matching capacitance value |
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2019
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350636A (en) * | 2019-08-12 | 2019-10-18 | 广东工业大学 | A kind of wireless charging system and method |
| CN110350636B (en) * | 2019-08-12 | 2024-02-13 | 深圳市磁迹科技有限公司 | Wireless charging system and method |
| CN112615440A (en) * | 2020-12-25 | 2021-04-06 | 国网北京市电力公司 | Wireless power transmission device and wireless power transmission system |
| CN113472088A (en) * | 2021-07-09 | 2021-10-01 | 江苏东大集成电路系统工程技术有限公司 | Wireless charging method and wireless charging system |
| CN113472088B (en) * | 2021-07-09 | 2024-04-23 | 东集技术股份有限公司 | Wireless charging method and wireless charging system |
| CN114475293A (en) * | 2021-12-22 | 2022-05-13 | 北京理工大学 | Position sensor-free electric automobile wireless charging automatic starting and guiding system |
| CN114475293B (en) * | 2021-12-22 | 2024-01-30 | 北京理工大学 | Automatic starting and guiding system for wireless charging of electric automobile without position sensor |
| CN114661090A (en) * | 2022-05-19 | 2022-06-24 | 深之蓝(天津)水下智能科技有限公司 | Method and system for self-adaptively acquiring matching capacitance value |
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