CN116667540A

CN116667540A - Wireless charging equipment and wireless charging system

Info

Publication number: CN116667540A
Application number: CN202211453969.5A
Authority: CN
Inventors: 王星; 黄华; 江森龙; 刘昆
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-08-29

Abstract

The embodiment of the application provides wireless charging equipment and a wireless charging system, which realize heat dissipation and realize thinner charging base thickness. The wireless charging device comprises an adapter and a charger comprising a cable and a charging base; the cable is internally provided with a charging wire, the charging base comprises a charging shell, the charging shell is provided with a containing cavity, and a wireless charging coil electrically connected with the charging wire is arranged in the containing cavity; the adapter charges the equipment to be charged through a charging wire and a wireless charging coil; a radiator is arranged in the adapter and comprises a first air inlet and a first air outlet; an air guide channel communicated with the first air outlet is arranged in the cable; the charging shell is provided with a second air inlet and a second air outlet communicated with the air guide channel; the radiator guides external air to flow into the first air inlet, and guides air to flow into the accommodating cavity through the first air outlet, the air guide channel and the second air inlet, so that air in the accommodating cavity flows out through the second air outlet after flowing through the wireless charging coil.

Description

Wireless charging equipment and wireless charging system

Technical Field

The present application relates to the field of charging technologies, and in particular, to a wireless charging device and a wireless charging system.

Background

Because wireless charging mode, more safe and reliable than wired charging mode, and convenient to use, consequently, more and more electronic equipment, especially mobile hand-held device (such as cell-phone, intelligent wrist-watch etc.) have all adopted wireless charging technique.

The cooperation of wireless charging coil and adapter is inhaled to magnetism has the advantage that degree of freedom is high as the wireless charging equipment that uses in common, can charge just to use, however, it has the problem that heat dissipation ability is poor.

Disclosure of Invention

In order to solve the technical problems, the application provides wireless charging equipment and a wireless charging system, which can realize heat dissipation without increasing the volume of a charging base.

In a first aspect, an embodiment of the present application provides a wireless charging apparatus, including: an adapter and a charger; the charger comprises a cable and a charging base; the adapter is internally provided with a printed circuit board, the cable is internally provided with a charging wire, the charging base comprises a charging shell, the charging shell is provided with a containing cavity, a wireless charging coil is arranged in the containing cavity, and the wireless charging coil is electrically connected with the charging wire; when the charging wire is electrically connected with the printed circuit board, the adapter charges the equipment to be charged which is placed on the charging base through the charging wire and the wireless charging coil; wherein, the adapter is also internally provided with a radiator, and the radiator comprises a first air inlet and a first air outlet; an air guide channel communicated with the first air outlet is also arranged in the cable; the charging shell is provided with a second air inlet and a second air outlet, and the second air inlet is communicated with the air guide channel; the radiator guides external air to flow into the first air inlet, and guides air to flow into the accommodating cavity through the first air outlet, the air guide channel and the second air inlet, so that air in the accommodating cavity flows out through the second air outlet after flowing through the wireless charging coil.

Through setting up small-size radiator in the adapter, guide the radiator to the radiator with external air to flow into the wireless charging coil place through the air duct and hold the cavity in, with taking away wireless charging coil's heat, realized radiating effect under the condition that does not increase charging base thickness and weight, and then realized optimal design, promoted user's visual experience. In addition, the charging base does not have any extra heat source except the wireless charging coil, so that the charging power can be improved, and the charging speed is further improved.

The cable and the charging base can be fixedly connected or can be connected in a pluggable manner.

An air guide groove is disposed between the first air outlet and the air guide channel for guiding more air to the air guide channel.

For example, the adapter may include a charging interface, to which the cable is plugged in to electrically connect with the adapter; alternatively, the cable is fixedly connected with the adapter.

In some possible implementations, the cable includes a cable housing disposed around the charging conductor, the cable housing and the charging conductor having a gap, the gap between the cable housing and the charging conductor forming the air guide channel. The structure for forming the air guide channel is not needed, only the air guide channel is formed by utilizing the gap between the cable shell and the charging lead, and the structure is simple and the cost is low.

In some possible implementations, the cable housing has a diameter greater than or equal to 2mm and less than or equal to 5mm, based on the gap between the cable housing and the charging conductor forming the air guide channel. The arrangement is that the appearance of the cable is not affected because the diameter of the cable shell is larger, and the transmission of air is not affected because the diameter of the cable shell is smaller.

Illustratively, the cable housing is a circular annular housing having a maximum diameter of 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or the like. It will be appreciated that the annular housing may be an annular housing within certain tolerances, the shape of which may change when actually provided.

In some possible implementations, the charging wire includes a positive wire and a negative wire on the basis that the gap between the cable housing and the charging wire forms an air guide channel; the cable also comprises an intermediate medium, the intermediate medium is arranged around the positive electrode lead, the periphery of the intermediate medium is provided with an annular conducting layer, and the annular conducting layer is a negative electrode lead; the gap between the annular conductive layer and the cable housing forms an air guide channel. Namely, the coaxial line is used as an energy transmission wire, so that the influence of electromagnetic compatibility problem can be reduced, and under the same diameter of the cable shell, when the coaxial line is used as the energy transmission wire, the gap between the annular conductive layer and the cable shell forms a larger air guide channel, thereby being beneficial to the flow of air.

In some possible implementations, the charging wire includes a positive wire and a negative wire on the basis that the gap between the cable housing and the charging wire forms an air guide channel; the positive electrode lead and the negative electrode lead form a twisted pair; the cable also comprises an intermediate medium and an insulating layer, wherein the intermediate medium is arranged around the twisted pair, and the insulating layer is arranged around the intermediate medium; the gap between the cable housing and the insulating layer forms an air guide channel. I.e., the positive and negative conductors transmit energy in the form of twisted pairs to reduce the effects of electromagnetic compatibility problems.

In some possible implementations, the periphery of the cable housing is provided with an annular shielding layer, which may be provided to further reduce the impact of electromagnetic compatibility issues.

In some possible implementations, the intermediate medium includes a non-conductive flexible medium to increase flexibility of the cable, thereby improving the user experience.

In some possible implementations, the dielectric medium includes silicone grease or other nonconductive flexible medium, etc., to increase the flexibility of the cable, in addition to the dielectric medium.

In some possible implementations, the charging housing includes opposite charging surfaces and a back surface, and further includes a sidewall connecting the charging surfaces and the back surface, and a second air inlet and a second air outlet are provided on the sidewall. The design of air intake and air outlet is more reasonable, and is favorable to wireless charging coil heat to dispel.

In some possible implementations, on the basis that the second air inlets and the second air outlets are arranged on the side wall, the number of the second air outlets is multiple, one of the second air outlets is opposite to the second air inlet, and the remaining second air outlets are uniformly arranged on the side wall so as to further improve the heat dissipation effect.

In some possible implementations, on the basis that the second air inlet and the second air outlet are arranged on the side wall, a connecting line between the second air inlet and the second air outlet forms a Chinese character 'mi'. The number of the second air inlets is seven, so that heat dissipation cannot be influenced due to the fact that the number of the second air outlets is small, process steps are complex when the charging shell is arranged due to the fact that the number of the second air outlets is large, external dust, water and the like enter the charging base, performance of the wireless charging coil is influenced, heat dissipation is guaranteed, and meanwhile the wireless charging coil in the charging base can be protected.

In some possible implementations, the heat sink includes a structure such as a fan or a piezoelectric air pump that is small in volume and that can direct outside air into the air guide channel.

In some possible implementations, the wireless charging device further includes a protection structure; when the wireless charging equipment is not used, the protection structure is used for shielding the second air outlet; when the adapter charges the equipment to be charged placed on the charging base through the charging wire and the wireless charging coil, the protection structure exposes the second air outlet. The setting of protection architecture can not influence the heat dissipation, and when not using this wireless charging equipment, also can avoid external dust, water etc. to get into in the charging base through the second air outlet, protect the wireless charging coil in the charging base.

In a second aspect, an embodiment of the present application provides a wireless charging device including an adapter and a charger; the charger comprises a cable and a charging base; the adapter is internally provided with a printed circuit board, the cable is internally provided with a charging wire, the charging base comprises a charging shell, the charging shell is provided with a containing cavity, a wireless charging coil and a piezoelectric air pump are arranged in the containing cavity, and the wireless charging coil and the piezoelectric air pump are electrically connected with the charging wire; when the charging wire is electrically connected with the printed circuit board, the adapter charges the equipment to be charged placed on the charging base through the charging wire and the wireless charging coil and supplies power to the piezoelectric air pump; the piezoelectric air pump comprises a first air inlet and a first air outlet; the charging shell is provided with a second air inlet and a second air outlet, and the second air inlet is opposite to the first air inlet; the piezoelectric air pump guides external air to flow into the first air inlet through the second air inlet, and guides air to flow into the accommodating cavity through the first air outlet, so that air in the accommodating cavity flows out through the second air outlet after flowing through the wireless charging coil.

Unlike the first aspect, the piezoelectric air pump is arranged in the charging base, and because the volume of the piezoelectric air pump is very small, the piezoelectric air pump is compared with other heat dissipation structures arranged in the charging base, the light and thin design of the charging base can be realized, and the visual experience of a user is improved.

In some possible implementations, the charging housing includes opposite charging surfaces and a back surface, the piezoelectric air pump being located between the plane of the wireless charging coil and the back surface in a direction perpendicular to the charging surfaces; the charging shell further comprises a side wall connecting the charging surface and the back, a second air inlet is formed in the back, and a second air outlet is formed in the side wall; the opening of the first air outlet faces the wireless charging coil, and the orthographic projection of the first air outlet on the plane of the charging surface is positioned in the middle of the orthographic projection of the wireless charging coil on the plane of the charging surface; the distance from the second air outlet to the charging surface is smaller than or equal to the distance from the plane where the wireless charging coil is located to the charging surface. The second air inlet can be added to the back of the charging base, the second air inlet is opposite to the first air inlet of the piezoelectric air pump, the direction of the first air outlet of the piezoelectric air pump is opposite to the direction of the first air inlet of the piezoelectric air pump and is towards the middle position of the wireless charging coil, so that air can be guided to the middle position of the wireless charging coil, and the distance from the second air outlet to the charging surface is smaller than or equal to the distance from the plane of the wireless charging coil to the charging surface due to the fact that the second air outlet is arranged on the side wall, and therefore external air is scattered into the outside after passing through the wireless coil, and heat dissipation of the wireless charging coil is facilitated.

In some possible implementation manners, on the basis that the second air outlets are formed in the side walls, the second air outlets are multiple in number, the second air outlets are uniformly formed in the side walls, and the design of the second air outlets is more reasonable, so that heat dissipation of the wireless charging coil is facilitated.

In some possible implementations, the wireless charging device further includes a protection structure; when the wireless charging equipment is not used, the protection structure is used for shielding the second air inlet and the second air outlet; when the adapter charges the equipment to be charged placed on the charging base through the charging wire and the wireless charging coil, the protection structure exposes the second air inlet and the second air outlet. The setting of protection architecture can not influence the heat dissipation, and when not using this wireless battery charging outfit, also can avoid external dust, water etc. to enter into the base that charges through second air intake and second air outlet in, protect the wireless charging coil in the base that charges.

In some possible implementations, the charging wire includes a positive wire, a negative wire, a positive power wire, and a negative power wire, one end of the positive wire and one end of the negative wire are both electrically connected to the wireless charging coil, and one end of the positive power wire and one end of the negative power wire are both electrically connected to the piezoelectric air pump; the charging wire is electrically connected with the printed circuit board, namely the other end of the positive electrode wire, the other end of the negative electrode wire, the other end of the positive power wire and the other end of the negative power wire are electrically connected with the printed circuit board; the cable comprises a cable shell and an intermediate medium, wherein the intermediate medium is arranged around the positive electrode lead, the periphery of the intermediate medium is provided with an annular conducting layer, and the annular conducting layer is a negative electrode lead; the positive and negative power lines are located between the annular conductive layer and the cable jacket. Namely, the coaxial line is used as a lead for energy transmission to replace a twisted pair, so that the influence of electromagnetic compatibility is reduced.

In some possible implementations, the intermediate medium includes a non-conductive flexible medium, on the basis that the cable includes an intermediate medium. That is, unlike common coaxial lines, silicone grease or other nonconductive flexible medium is filled between the positive and negative wires to increase flexibility of the cable and enhance user experience. This is because the cable transmission frequency is in the Khz level, and there is no high-frequency signal transmission requirement, so that the problem of insertion loss of a common coaxial line can be hardly considered, and the emphasis is on flexibility.

In some possible implementations, on the basis that the cable includes a cable housing, an annular shielding layer is disposed on the periphery of the cable housing, and the annular shielding layer may further reduce the influence of the electromagnetic compatibility problem.

In a third aspect, an embodiment of the present application provides a wireless charging system, where the wireless charging system includes a device to be charged and the wireless charging device in the first aspect or the second aspect, and the wireless charging device has the same advantages as the first aspect or the second aspect, and is used for wirelessly charging the device to be charged.

Drawings

Fig. 1 is a schematic diagram of an application scenario of a wireless charging device according to an embodiment of the present application;

Fig. 2 is a schematic diagram of an application scenario of a wireless charging device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a wireless charging system according to an embodiment of the present application;

fig. 4 is a schematic circuit diagram of a wireless charging system according to an embodiment of the present application;

FIG. 5 is a schematic view of an adapter according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a cable according to an embodiment of the present application;

FIG. 7 is a cross-sectional view taken along the direction AA' of FIG. 6;

fig. 8 is a schematic structural diagram of a charging base according to an embodiment of the present application;

FIG. 9 is a cross-sectional view taken along the BB' direction of FIG. 8;

fig. 10 is a schematic diagram of a positional relationship among a wireless charging coil, a magnetic attraction assembly and ferrite according to an embodiment of the present application;

FIG. 11 is a diagram illustrating a positional relationship between a second air inlet and a second air outlet according to an embodiment of the present application;

FIG. 12 is a further cross-sectional view taken along the direction AA' of FIG. 6;

FIG. 13 is a further cross-sectional view taken along the direction AA' of FIG. 6;

FIG. 14 is a further cross-sectional view taken along the direction AA' of FIG. 6;

fig. 15a to 15d are schematic diagrams of EMC results obtained by simulating cables of respective structures in the embodiment of the present application;

FIG. 16 is a further cross-sectional view taken along the direction AA' of FIG. 6;

FIG. 17 is a further cross-sectional view taken along the direction AA' of FIG. 6;

fig. 18 is a schematic structural diagram of a charging base according to another embodiment of the present application;

FIG. 19 is a cross-sectional view taken along the direction CC' of FIG. 18;

fig. 20 is a further cross-sectional view of fig. 6 along direction AA'.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.

The terms first and second and the like in the description and in the claims of embodiments of the application, are used for distinguishing between different objects and not necessarily for describing a particular sequential order of objects. For example, the first target object and the second target object, etc., are used to distinguish between different target objects, and are not used to describe a particular order of target objects.

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, the plurality of processing units refers to two or more processing units; the plurality of systems means two or more systems.

Currently, there are two main forms of wireless charging devices: one is wireless charging seat, as shown in fig. 1, electronic equipment (such as a mobile phone 10) can be placed on the wireless charging seat 20 for wireless charging, the wireless charging seat 20 is large in volume, an air duct is arranged in the wireless charging seat, and active heat dissipation can be achieved, however, the mobile phone 10 on the wireless charging seat 20 cannot be used while being charged, and user experience is poor. The other is the matching of the magnetic wireless charging coil and the adapter, as shown in fig. 2, the matching of the wireless charging coil 30 and the adapter 40 can make the mobile phone use while charging, and the degree of freedom is high, but the heat dissipation capability is poor. This is because the magnetic attraction attracts the wireless charging coil 30 tightly at the back shell of the mobile phone, there is almost no air channel in the middle, and if a fan and an air channel are added, the wireless charging coil 30 becomes thick, that is, besides the magnet needs to be added, the attraction force is lifted, the position of the fan needs to be reserved for the wireless charging coil 30, so that the wireless charging coil can be very thick, and further the appearance visual experience is poor.

Based on this, the embodiment of the present application provides a wireless charging system including a wireless charging device (may also be referred to as a wireless charging transmitting device) and a device to be charged (may also be referred to as a wireless charging receiving device), where the wireless charging device is configured to charge the device to be charged having a wireless charging function. The wireless charging device includes a magnetic wireless charging coil and an adapter, and the device to be charged may be a mobile phone, a tablet, a notebook computer, a personal digital assistant (personal digital assistant, PDA for short), a vehicle-mounted computer, an intelligent wearable device (such as an intelligent watch, an intelligent bracelet, an earphone, etc.), a Virtual Reality (VR), an augmented reality (augmented reality, AR), etc. with a built-in rechargeable battery. The equipment to be charged can also be electronic products such as wireless charging electric automobiles, wireless charging household appliances (such as sweeping robots and the like), unmanned aerial vehicles and the like.

The wireless charging equipment provided by the embodiment of the application can solve the heat dissipation problem on the premise of meeting the requirement of charging and using the mobile phone, does not increase the weight and thickness of the wireless charging coil, is favorable for the light and thin design of the wireless charging coil, and improves the use experience of users.

The following describes a structure of the wireless charging transmitting apparatus in conjunction with a wireless charging receiving apparatus, where the wireless charging receiving apparatus is a mobile phone.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a wireless charging system according to an embodiment of the present application. As shown in fig. 3, the wireless charging system 01 includes a wireless charging transmission device 50 and a wireless charging reception device 10. The wireless charging transmission device 50 includes a magnetic wireless charging coil 30 and an adapter 40, the magnetic wireless charging coil 30 includes a cable 31 and a charging base 32, wherein one end of the cable 31 may be fixedly connected to the charging base 32, or may be pluggable connected to the charging base 32, the other end of the cable 31 may be fixedly connected to the adapter 40, or may be pluggable connected to the adapter 40, for example, the adapter 40 includes a charging interface 41, the adapter 40 is connected to the cable 31 through the charging interface 41, and the cable 31 is pluggable connected to the charging interface 41 of the adapter 40. The adapter 40 wirelessly charges the handset 10 through the magnetically attracted wireless charging coil 30.

Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a wireless charging system according to an embodiment of the present application. As shown in fig. 4, the wireless charging transmission apparatus 50 further includes a wireless transmission device including a voltage conversion circuit 41, a Direct Current (DC)/alternating Current (Alternating Current, AC) circuit 42, a resonant capacitor C1, and a transmitting coil L1, wherein the voltage conversion circuit 41, the Direct Current (DC)/alternating Current (Alternating Current, AC) circuit 42, and the resonant capacitor C1 are disposed in the adapter 40, and the transmitting coil L1 is disposed in the charging base 32 and electrically connected to the Direct Current (DC)/alternating Current (Alternating Current, AC) circuit 42 and the resonant capacitor C1 in the adapter 40 through the cable 31.

The adapter 40 is capable of converting 220V ac power into dc power (e.g., 5V, 20V, etc.) according to the charging power requirement, wherein the dc power converted by the adapter 40 is the first dc voltage in order to distinguish between other dc voltages.

The voltage conversion circuit 41 is used for converting the first direct current voltage into a stable second direct current voltage. The voltage conversion circuit 41 is, for example, a boost circuit (also referred to as boost circuit) for boosting the first dc voltage and outputting the boosted voltage. Of course, the voltage conversion circuit 41 is not limited to the step-up circuit, and may be a step-down circuit for outputting the first dc voltage after being stepped down.

A Direct Current (DC)/alternating Current (Alternating Current, AC) circuit 42 is electrically connected to the voltage converting circuit 41, for converting the second DC voltage output from the voltage converting circuit 41 into an alternating Current. Illustratively, the DC/AC circuit 42 is, for example, a full bridge circuit or a half bridge circuit. The DC/AC circuit 42 is also referred to as a Transmit (TX) chip, among others.

The resonance capacitor C1 and the transmitting coil L1 are connected in series to form a series resonance network, and the transmitting coil L1 is electrically connected to the DC/AC circuit 42 through the resonance capacitor C1. During the charging and discharging of the resonance capacitor C1 and the transmitting coil L1 by the DC/AC circuit 42, the transmitting coil L1 may be enabled to convert alternating current into an alternating magnetic field.

With continued reference to fig. 4, a wireless charging receiving apparatus (i.e., a cellular phone) 10 includes a wireless receiving device 11 and a battery 12.

The wireless receiving device 11 includes a receiving coil L2, a resonance capacitor C2, and an AC/DC circuit 111.

The receiving coil L2 is configured to receive the alternating magnetic field output by the transmitting coil L1 and convert the alternating magnetic field into layer alternating current. The receiving coil L2 and the resonance capacitor C2 form a series resonance network. The receiving coil L2 is electrically connected to the AC/DC circuit 111 through the resonance capacitor C2, and the AC/DC circuit 111 is electrically connected to the battery 12. The AC/DC circuit 111 is configured to convert the AC power generated by the receiving coil L2 into DC power and output the DC power to the battery 12 to charge the battery 12, thereby completing wireless charging of the mobile phone 10. The AC/DC circuit 111 may be, for example, a rectifier bridge. Among them, the AC/DC circuit 111 is also called a Reception (RX) chip.

In some embodiments, the wireless receiving device 11 may also include a voltage conversion circuit 112 when the direct current output by the AC/DC circuit 111 is too large to be directly supplied to the battery 12. The voltage conversion circuit 112 is electrically connected to the AC/DC circuit 111 and the battery 12, respectively, for reducing a large voltage output from the AC/DC circuit 111 to a charging voltage of the battery 12. The voltage conversion circuit 112 is, for example, a step-down circuit (also referred to as a buck circuit).

Referring to fig. 5, fig. 5 is a schematic structural diagram of an adapter according to an embodiment of the present application. As shown in fig. 5, the adapter 40 includes an adapter housing 43, the adapter housing 43 has a housing cavity in which a printed circuit board 44 is disposed, and the above-described voltage conversion circuit 41, direct Current (DC)/alternating Current (Alternating Current, AC) circuit 42, and resonance capacitor C1 (not shown in fig. 5) and the like are disposed on the printed circuit board 44. The adapter housing 43 includes a first surface 431, a second surface 433 opposite the first surface 431, and an annular surface 434 connecting the first surface 431 and the second surface 433, the first surface 431 having the charging interface 41 described above disposed thereon. The plane of the printed circuit board 44 is, for example, parallel to the first surface 431, which results in a more compact structure within the adapter 40, which is advantageous for a miniaturized design of the adapter 40.

With continued reference to fig. 5, in order to achieve the heat dissipation effect, the heat dissipation device 45 is disposed in the adapter 40, where the heat dissipation device 45 includes a first air inlet 451 and a first air outlet 452, and correspondingly, an opening 432 is formed on the first surface 431, where the opening 432 is opposite to the first air inlet 451, that is, a projection of the first air inlet 451 on a plane of the first surface 431 overlaps with the opening 432, and illustratively, a projection of the first air inlet 451 on a plane of the first surface 431 coincides with the opening 432, or, a projection of the first air inlet 451 on a plane of the first surface 431 is located in the opening 432, that is, a size of a projection of the first air inlet 451 on a plane of the first surface 431 is smaller than a size of the opening 432, or, a projection of the opening 432 is located in a plane of the first air inlet 451 on the first surface 431 is larger than a size of the opening 432.

The first air outlet 452 is opposite to the charging interface 41, that is, the projection of the first air outlet 452 on the plane of the first surface 431 overlaps with the charging interface 41, where the projection of the first air outlet 452 on the plane of the first surface 431 is located in the charging interface 41, that is, the projection of the first air outlet 452 on the plane of the first surface 431 is smaller than the size of the charging interface 41.

Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a cable according to an embodiment of the present application, and fig. 7 is a cross-sectional view along AA' direction of fig. 6. As shown in fig. 6 and 7, the cable 31 includes a ring-shaped cable housing 311, and a charging wire 312 is disposed in the cable housing 311, that is, the cable housing 311 is disposed around the charging wire 312, wherein the charging wire 312 includes a positive electrode wire and a negative electrode wire (not shown in the drawings), which constitute a twisted pair, for example. The cable housing 311 and the charging wire 312 have a gap, the gap between the cable housing 311 and the charging wire 312 forms an air guide channel 313, the air guide channel 313 is communicated with the first air outlet 452, and air at the first air outlet 452 can flow into the air guide channel 313.

Referring to fig. 8 and 9, fig. 8 is a schematic structural diagram of a charging base according to an embodiment of the present application, and fig. 9 is a cross-sectional view along BB' of fig. 8. As shown in fig. 8 and 9, the charging base 32 includes a charging housing 321, the charging housing 321 includes a charging surface 322 and a back surface 323 opposite to each other, and a side wall 324 connecting the charging surface 322 and the back surface 323, and a second air inlet 325 and a second air outlet 326 are formed on the side wall 324.

Referring to fig. 10, fig. 10 is a schematic diagram illustrating a positional relationship among a wireless charging coil, a magnetic attraction component and ferrite according to an embodiment of the present application. As shown in fig. 10, a wireless charging coil (i.e., transmitting coil L1), a magnetically attractable component 327, and ferrite 328 are disposed within the receiving cavity. The wireless charging coil L1 is electrically connected with the charging wire 312, the magnetic attraction component 327 is disposed on the periphery of the wireless charging coil L1 and surrounds the wireless charging coil L1, and the ferrite 328 is disposed on a side of the wireless charging coil L1 facing away from the charging surface 322. The magnetic component 327 is used to magnetically fix the mobile phone 10 on the charging surface 322, and the ferrite 328 binds the magnetic field generated by the wireless charging coil L1, so that the magnetic field generated by the wireless charging coil L1 radiates to the charging surface 322.

When the cable 31 is inserted into the charging interface 41 of the adapter 40, the charging wire 312 is electrically connected to the printed circuit board 11 in the adapter 40, and the adapter 40 charges the mobile phone 10 to be charged placed on the charging surface 322 through the voltage conversion circuit 41, direct Current (DC)/alternating Current (Alternating Current, AC) circuit 42, the resonance capacitor C1, the charging wire 312, and the wireless charging coil L1.

During charging, the wireless charging coil L1 generates heat. The radiator 45 guides the external air to flow into the first air inlet 451 through the opening 432, and guides the air to flow out of the first air outlet 452 so that the air flows into the air guide channel 313. In some embodiments, in order to make more air guide channels 313, an air guide groove (not shown in the figure) is provided between the first air outlet 452 and the air guide channels 313. The air in the air guide channel 313 flows into the accommodating cavity of the charging housing 321 through the second air inlet 325. The air entering the accommodating cavity takes away the heat on the wireless charging coil L1 and then is dissipated into the outside through the second air outlet 326, so that the heat dissipation effect is realized.

In the embodiment of the application, by arranging the small-sized radiator 45 in the adapter 40, external air is guided into the radiator 45 through the radiator 45 and flows into the accommodating cavity where the wireless charging coil L1 is located through the air guide channel 313, so that heat of the wireless charging coil L1 is taken away, the radiating effect is realized under the condition that the thickness and the weight of the charging base 32 are not increased, the optimal appearance design is realized, and the visual experience of a user is improved. In addition, since the charging base 32 has no additional heat source other than the wireless charging coil L1, the charging power and thus the charging speed can be increased.

As for the type of the radiator 45, the embodiment of the present application does not limit the type of the radiator 45, as long as the outside air can be guided into the air guide passage 313. Illustratively, the heat sink 45 includes a small-sized device such as a small fan or a piezoelectric air pump.

It will be appreciated that when the heat sink 45 comprises a small fan, the opening 432 may be located on the annular surface 434, for example.

Regarding the number and positions of the second air outlets 326, the number and positions of the second air outlets 326 are not limited in the embodiment of the present application, and a person skilled in the art may set the number and positions of the second air outlets 326 according to actual situations, so long as the heat of the wireless charging coil L1 can be dissipated to the outside.

In some embodiments, referring to fig. 11, fig. 11 is a positional relationship diagram of a second air inlet and a second air outlet according to an embodiment of the present application. As shown in fig. 11, the number of the second air outlets 326 is plural, wherein one second air outlet 326 is opposite to the second air inlet 325, that is, the second air inlet 325 can be exposed through the second air outlet 326, and the remaining second air outlets 326 are uniformly disposed on the side wall 324, that is, the distance between two adjacent second air outlets 326 is the same. The arrangement is beneficial to improving the heat dissipation effect.

In this case, the connection line between the second air inlet 325 and the second air outlet 326 forms a shape like a Chinese character 'mi', that is, the number of the second air inlets 325 is one, and the number of the second air outlets 326 is seven, so that the arrangement does not affect the heat dissipation due to the smaller number of the second air outlets 326, and also does not complicate the process steps when the charging case 321 is arranged and make external dust, water, etc. enter the charging base 32, affect the performance of the wireless charging coil L1, and can protect the wireless charging coil L1 in the charging base 32 while guaranteeing heat dissipation.

To further prevent external dust, water, etc. from entering the charging base 32, the wireless charging transmission apparatus 50 further includes a protection structure (not shown in the drawings). When the wireless charging transmitting device 50 is not used to charge the wireless charging receiving device 10, the protection structure is used to shield the second air outlet 326, so as to prevent external dust, water, etc. from entering the charging base 32. When the wireless charging transmitting device 50 charges the wireless charging receiving device 10, the protection structure exposes the second air outlet 326, so that the air taking away the heat of the wireless charging coil L1 is dissipated to the outside through the second air outlet 326.

For the specific arrangement mode of the protection structure, the embodiment of the application does not limit the specific arrangement mode of the protection structure, as long as the second air outlet 326 is exposed during charging, and the protection of the second air outlet 326 is within the protection scope of the application when the protection structure is not charged.

Regarding the size of the cable housing 311, the size of the cable housing 311 is not limited in the embodiment of the present application, as long as a gap is provided between the cable housing 311 and the charging wire 312, and the air guide passage 313 may be formed. Illustratively, the diameter of the cable housing 311 is greater than or equal to 2mm and less than or equal to 5mm, which is arranged so as not to affect the appearance of the cable 31 due to the larger diameter of the cable housing 311, nor to affect the air transmission due to the smaller diameter of the cable housing 311.

Considering that the gap between the cable housing 311 and the charging wire 312 increases the size of the cable 31, thereby affecting the flexibility of the cable 31, fig. 12 is a further sectional view of fig. 6 along the AA' direction, see fig. 12. As shown in fig. 12, the cable 31 further includes a nonconductive flexible medium 314 and an insulating layer 315 (for example, a lacquer), where the nonconductive flexible medium 314 surrounds a twisted pair formed by the positive electrode conductive wire 3121 and the negative electrode conductive wire 3122, the insulating layer 315 surrounds the nonconductive flexible medium 314, and a gap between the cable housing 311 and the insulating layer 315 forms an air guide channel 313, and the nonconductive flexible medium 314 may be, for example, silicone grease or other nonconductive flexible medium, so that the flexibility of the cable 31 can be increased and the use experience of a user can be improved.

Considering that the signal transmitted by the charging wire 312 is an ac signal, the higher harmonics cause a problem of greater electromagnetic compatibility (Electro Magnetic Compatibility, EMC), and thus, referring to fig. 13, fig. 13 is a further cross-sectional view along the AA' direction of fig. 6. As shown in fig. 13, the charging wire 312 includes a positive electrode wire 3121 and a negative electrode wire 3122, the cable 31 further includes a non-conductive flexible medium 314, the non-conductive flexible medium 314 is disposed around the positive electrode wire 3121, and an annular conductive layer is disposed on the periphery of the non-conductive flexible medium 314, and the annular conductive layer is the negative electrode wire 3122. The gap between the annular conductive layer and the cable housing 311 forms an air guide channel 313. I.e. using a coaxial wire as a charging wire for energy transmission, reduces the impact of EMC problems, and furthermore, unlike common coaxial wires, the space between the positive and negative wires 3121, 3122 is filled with silicone grease or other non-conductive flexible medium to increase the flexibility of the cable. The cable transmission frequency is in KHz level, and high-frequency signal transmission is not required, so that the problem of insertion loss of a common coaxial line can be hardly considered, and the flexibility is emphasized to improve the user experience.

In order to further reduce the effect of the electromagnetic compatibility problem, see fig. 14, fig. 14 is a further cross-sectional view of fig. 6 along the AA' direction. As shown in fig. 14, the outer periphery of the cable housing 311 is provided with an annular shielding layer 316, wherein fig. 14 is an explanation taking the outer periphery of the cable housing 311 provided with the annular shielding layer 316 as an example when coaxial wires are used as the wires for energy transmission. The material and thickness of the shielding layer 316 are not limited in this embodiment, and those skilled in the art may set the material according to practical situations, and exemplary materials of the shielding layer 316 are, for example, aluminum foil, and the thickness of the shielding layer 316 is, for example, 0.12mm.

Referring to fig. 15a-15d, fig. 15a-15d are schematic diagrams of EMC results obtained by simulating cables of various structures in the embodiment of the present application, wherein the abscissa is frequency (in MHz) and the ordinate is EMC result (in dB). The cables of the respective structures include a normal cable (twisted pair and a cable case disposed around the twisted pair) shown in fig. 16, a cable (a cable case of the cable shown in fig. 12 is provided with a round of shielding layer, wherein the thickness of the shielding layer is 0.12 mm), a cable shown in fig. 13, and a cable shown in fig. 14 (wherein the thickness of the shielding layer is 0.12 mm) shown in fig. 17.

Fig. 15a corresponds to an EMC result diagram obtained by simulating the cable shown in fig. 16, fig. 15b corresponds to an EMC result diagram obtained by simulating the cable shown in fig. 17, fig. 15c corresponds to an EMC result diagram obtained by simulating the cable shown in fig. 13, and fig. 15d corresponds to an EMC result diagram obtained by simulating the cable shown in fig. 14.

Table 1 shows the comparative simulation results of the cables of the respective structures described above.

Simulation shows that when the shielding layer is not available, the cable radiation capacity of the coaxial cable serving as the charging wire for energy transmission is obviously weaker than that of the cable of the twisted pair serving as the charging wire for energy transmission, and after the shielding layer with the same thickness is added, the cable radiation capacity of the coaxial cable serving as the charging wire for energy transmission is slightly weaker than that of the cable of the twisted pair serving as the charging wire for energy transmission, namely, the result of EMC of the cable of the coaxial cable serving as the charging wire for energy transmission is optimized compared with that of the cable of the twisted pair serving as the charging wire for energy transmission, whether the shielding layer is added or not, and particularly, the index of nearly 1dB can be improved under the condition of adding the shielding layer.

The above example is described by taking the case where the radiator is provided in the adapter, but the present application is not limited thereto. In other optional embodiments of the present application, the piezoelectric air pump may be further disposed in the charging base, and because the volume of the piezoelectric air pump is very small, compared with the case that other heat dissipation structures are disposed in the charging base, the present application may also achieve a light and thin design of the charging base, and enhance the user's visual experience.

For example, referring to fig. 18, fig. 18 is a schematic structural view of a charging base according to another embodiment of the present application, and fig. 19 is a cross-sectional view of fig. 18 along the direction CC'. As shown in fig. 18 and 19, a wireless charging coil L1 and a piezoelectric air pump 453 are disposed in the accommodating cavity of the charging base 32, and the wireless charging coil L1 and the piezoelectric air pump 453 are electrically connected to the charging wire 312, and the charging wire 312 includes a positive electrode wire and a negative electrode wire (not shown in the drawings) for supplying alternating current to the wire charging coil L1, and further includes a positive power wire and a negative power wire (not shown in the drawings) for supplying power to the piezoelectric air pump 453, wherein the positive power wire and the negative power wire are electrically connected to the piezoelectric air pump 453, and the positive electrode wire and the negative electrode wire are electrically connected to the wireless charging coil L1. When the charging wire 312 is electrically connected with the printed circuit board 44, the adapter 40 charges the mobile phone to be charged placed on the charging base 32 through the charging wire 312 and the wireless charging coil L1 and supplies power to the piezoelectric air pump 451.

The piezoelectric air pump 453 includes a first air inlet 451 and a first air outlet 452, the charging housing 321 is provided with a second air inlet 325 and a second air outlet 326, and the second air inlet 325 is opposite to the first air inlet 451, i.e. the second air inlet 325 can expose the first air inlet 451. The piezoelectric air pump 453 guides the external air to flow into the first air inlet 451 through the second air inlet 325, and guides the air to flow into the accommodating cavity through the first air outlet 452, so that the air in the accommodating cavity flows out through the second air outlet 326 after flowing through the wireless charging coil L1.

Through setting up piezoelectricity air pump 453 in charging base 32, because piezoelectricity air pump 453's volume is very little, consequently, compare in setting up other heat radiation structure in charging base 32, also can realize charging base 32's frivolous design, promote user's visual experience.

In this case, in order to make the air from the first air outlet 452 flow through the wireless charging coil L1 more, with continued reference to fig. 19, the piezoelectric air pump 453 is located between the plane of the wireless charging coil L1 and the back surface 323 in the direction perpendicular to the charging surface 322. The second air inlet 325 is disposed on the back surface 323, and the second air outlet 326 is disposed on the sidewall 324. The opening of the first air outlet 452 faces the wireless charging coil L1, and the orthographic projection of the first air outlet 452 on the plane of the charging surface is located at the middle position of the orthographic projection of the wireless charging coil L1 on the plane of the charging surface, and the distance H1 from the second air outlet 326 to the charging surface 322 is smaller than or equal to the distance H2 from the plane of the wireless charging coil L1 to the charging surface 322.

Therefore, the air from the first air outlet 452 can directly flow into the middle position of the wireless charging coil L1 and flow from the middle position of the wireless charging coil L1 to the edge of the wireless charging coil L1, so that the air is dispersed into the outside after passing through each position of the wireless charging coil L1, which is beneficial to heat dissipation of the wireless charging coil L1.

In this case, the number of the second air outlets 326 disposed on the side wall 324 is multiple, and the plurality of second air outlets 326 are uniformly disposed on the side wall, i.e. the distances between two adjacent second air outlets 326 are the same, so that the design of the second air outlets is more reasonable, which is beneficial to the dissipation of the heat of the wireless charging coil L1.

To further prevent external dust, water, etc. from entering the charging base 32, the wireless charging transmission apparatus 50 further includes a protection structure (not shown in the drawings). The wireless charging device 50 also includes a protective structure (not shown in the figures); when the wireless charging device 50 is not in use, the protection structure is used for shielding the second air inlet 325 and the second air outlet 326; when the adapter 40 charges the mobile phone 10 to be charged placed on the charging base 32 through the charging wire 312 and the wireless charging coil L1, the protection structure exposes the second air inlet 325 and the second air outlet 326. The arrangement of the protection structure does not affect heat dissipation, and when the wireless charging device is not used, external dust, water and the like can be prevented from entering the charging base 32 through the second air inlet 325 and the second air outlet 326, so that the wireless charging coil L1 in the charging base 32 is protected.

It will be appreciated that since the piezoelectric air pump 453 is disposed within the charging base 32, no air guide channel is required within the cable 32.

It will be appreciated that the positive and negative conductors may also be made coaxial when no air guide channels are required in the cable 32, to reduce the effects of electromagnetic compatibility issues. For example, referring to fig. 20, fig. 20 is a further cross-sectional view of fig. 6 along direction AA'. As shown in fig. 20, the non-conductive flexible medium 314 is disposed around the positive electrode lead 3121, and an annular conductive layer is disposed on the periphery of the non-conductive flexible medium 314, and the annular conductive layer is the negative electrode lead 3122. The positive power supply line 3123 and the negative power supply line 3124 are located between the annular conductive layer and the cable housing 311. Namely, the coaxial line is used as a lead for energy transmission to replace a twisted pair, so that the influence of electromagnetic compatibility is reduced.

Similarly, in order to further reduce the influence of the electromagnetic compatibility problem, with continued reference to fig. 20, the periphery of the cable housing 311 is provided with an annular shielding layer 316, where the material and thickness of the shielding layer 316 are not limited in the embodiments of the present application, and those skilled in the art may set the shielding layer according to the practical situation, and the material of the shielding layer 316 is, for example, aluminum foil, and the thickness of the shielding layer 316 is, for example, 0.12mm.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A wireless charging device, comprising: an adapter and a charger; the charger comprises a cable and a charging base;

the adapter is internally provided with a printed circuit board, the cable is internally provided with a charging wire, the charging base comprises a charging shell, the charging shell is provided with a containing cavity, a wireless charging coil is arranged in the containing cavity, and the wireless charging coil is electrically connected with the charging wire;

when the charging wire is electrically connected with the printed circuit board, the adapter charges the equipment to be charged which is placed on the charging base through the charging wire and the wireless charging coil;

A radiator is further arranged in the adapter, and the radiator comprises a first air inlet and a first air outlet; an air guide channel communicated with the first air outlet is also arranged in the cable; the charging shell is provided with a second air inlet and a second air outlet, and the second air inlet is communicated with the air guide channel;

the radiator guides external air to flow into the first air inlet, and guides air to flow into the accommodating cavity through the first air outlet, the air guide channel and the second air inlet, so that air in the accommodating cavity flows through the wireless charging coil and then flows out through the second air outlet.

2. The wireless charging device of claim 1, wherein the cable comprises a cable housing disposed around the charging conductor, the cable housing and the charging conductor having a gap, the gap between the cable housing and the charging conductor forming the air guide channel.

3. The wireless charging device of claim 2, wherein the cable housing has a diameter greater than or equal to 2mm and less than or equal to 5mm.

4. The wireless charging device of claim 2, wherein the charging wire comprises a positive wire and a negative wire;

The cable also comprises an intermediate medium, wherein the intermediate medium is arranged around the positive electrode lead, an annular conducting layer is arranged on the periphery of the intermediate medium, and the annular conducting layer is the negative electrode lead; the gap between the annular conductive layer and the cable housing forms the air guide channel.

5. The wireless charging device of claim 2, wherein the charging wire comprises a positive wire and a negative wire; the positive electrode lead and the negative electrode lead form a twisted pair;

the cable further includes an intermediate medium disposed around the twisted pair and an insulating layer disposed around the intermediate medium;

the gap between the cable housing and the insulating layer forms the air guide channel.

6. The wireless charging device of any of claims 2-5, wherein a periphery of the cable housing is provided with an annular shield.

7. The wireless charging device of claim 4 or 5, wherein the intermediate medium comprises a non-conductive flexible medium.

8. The wireless charging device of claim 7, wherein the non-conductive flexible medium comprises silicone grease.

9. The wireless charging device of claim 1, wherein the charging housing comprises opposing charging surfaces and a back surface, and further comprising a sidewall connecting the charging surfaces and the back surface, the sidewall having the second air inlet and the second air outlet disposed thereon.

10. The wireless charging device of claim 9, wherein the number of second air outlets is a plurality, wherein one of the second air outlets is opposite to the second air inlet, and the remaining second air outlets are uniformly disposed on the side wall.

11. The wireless charging device of claim 9 or 10, wherein a connection between the second air inlet and the second air outlet forms a chevron shape.

12. The wireless charging device of claim 1, wherein the heat sink comprises a fan or a piezoelectric air pump.

13. The wireless charging device of claim 1, wherein the wireless charging device further comprises a protective structure; when the wireless charging equipment is not used, the protection structure is used for shielding the second air outlet; when the adapter charges the equipment to be charged placed on the charging base through the charging wire and the wireless charging coil, the protection structure exposes the second air outlet.

14. A wireless charging device characterized by an adapter and a charger; the charger comprises a cable and a charging base;

a printed circuit board is arranged in the adapter, a charging wire is arranged in the cable, the charging base comprises a charging shell, the charging shell is provided with a containing cavity, a wireless charging coil and a piezoelectric air pump are arranged in the containing cavity, and the wireless charging coil and the piezoelectric air pump are electrically connected with the charging wire;

when the charging wire is electrically connected with the printed circuit board, the adapter charges equipment to be charged placed on the charging base through the charging wire and the wireless charging coil and supplies power to the piezoelectric air pump;

the piezoelectric air pump comprises a first air inlet and a first air outlet; the charging shell is provided with a second air inlet and a second air outlet, and the second air inlet is opposite to the first air inlet;

the piezoelectric air pump guides external air to flow into the first air inlet through the second air inlet, and guides air to flow into the accommodating cavity through the first air outlet, so that air in the accommodating cavity flows through the wireless charging coil and then flows out through the second air outlet.

15. The wireless charging device of claim 14, wherein the charging housing comprises opposing charging surfaces and a back surface, the piezoelectric air pump being located between the plane of the wireless charging coil and the back surface in a direction perpendicular to the charging surfaces;

the charging shell further comprises a side wall connecting the charging surface and the back surface, the second air inlet is arranged on the back surface, and the second air outlet is arranged on the side wall;

the opening of the first air outlet faces the wireless charging coil, and the orthographic projection of the first air outlet on the plane of the charging surface is positioned in the middle of the orthographic projection of the wireless charging coil on the plane of the charging surface;

the distance from the second air outlet to the charging surface is smaller than or equal to the distance from the plane where the wireless charging coil is located to the charging surface.

16. The wireless charging device of claim 15, wherein the number of the second air outlets is plural, and the plural second air outlets are uniformly disposed on the side wall.

17. The wireless charging device of any one of claims 14-16, wherein the wireless charging device further comprises a protective structure; when the wireless charging equipment is not used, the protection structure is used for shielding the second air inlet and the second air outlet; when the adapter charges the equipment to be charged placed on the charging base through the charging lead and the wireless charging coil, the protection structure exposes the second air inlet and the second air outlet.

18. The wireless charging device of claim 14, wherein the charging wire comprises a positive wire, a negative wire, a positive power wire, and a negative power wire, wherein one end of the positive wire and one end of the negative wire are both electrically connected to the wireless charging coil, and wherein one end of the positive power wire and one end of the negative power wire are both electrically connected to the piezoelectric pump; the charging wire is electrically connected with the printed circuit board, namely the other end of the positive wire, the other end of the negative wire, the other end of the positive power wire and the other end of the negative power wire are electrically connected with the printed circuit board;

the cable comprises a cable shell and an intermediate medium, wherein the intermediate medium is arranged around the positive electrode lead, an annular conducting layer is arranged on the periphery of the intermediate medium, and the annular conducting layer is the negative electrode lead; the positive power supply line and the negative power supply line are located between the annular conductive layer and the cable housing.

19. The wireless charging device of claim 18, wherein the intermediate medium comprises a non-conductive flexible medium.

20. The wireless charging device of claim 18, wherein a periphery of the cable housing is provided with an annular shield.

21. A wireless charging system comprising a device to be charged and a wireless charging device according to any one of claims 1-20;

the wireless charging equipment is used for wirelessly charging the equipment to be charged.