Terminal device, wireless charger, wireless charging method, and wireless charging system

Abstract

The invention discloses terminal equipment, a wireless charger, a wireless charging method and a wireless charging system. The terminal equipment comprises a display screen, a rear shell, a battery and a first wireless receiving coil. The rear shell is opposite to the display screen; the battery is arranged between the display screen and the rear shell; the first wireless receiving coil is coupled with the battery, arranged on the back side of the display screen and used for wirelessly charging the battery, and the back side of the display screen refers to the side, facing the rear shell, of the display screen. Compared with the back side of the rear shell, the back side of the display screen has a larger area for laying the first wireless receiving coil, under the condition, the laying area of the first wireless receiving coil can be larger, and the larger the laying area of the first wireless receiving coil is, the better the heat dissipation effect is, and the better the charging effect is.

Description

Technical Field

[0001] The present application belongs to the technical field of wireless charging, and in particular relates to a terminal device, a wireless charger, a wireless charging method and a wireless charging system. Background Art

[0002] Wireless charging technology is widely used in mobile terminals and other terminal devices due to its convenience. In wireless charging technology, the larger the coil laying area, the better the heat dissipation effect, the temperature is not easy to rise, the terminal device charges faster, and the charging effect is better.

[0003] However, as the functions of terminal devices become more diverse and complex, terminal devices integrate more and more functional modules, which makes the internal space of terminal devices more compact. Based on this, how to achieve a larger area of ​​coil laying in the compact internal space of terminal devices is one of the problems that the industry needs to solve. Summary of the invention

[0004] The embodiments of the present application provide a terminal device, a wireless charger, a wireless charging method and a wireless charging system, which can improve the charging effect of the terminal device.

[0005] In a first aspect, an embodiment of the present application provides a terminal device. The terminal device includes a display screen, a rear shell, a battery, and a first wireless receiving coil. The rear shell is arranged opposite to the display screen. The battery is arranged between the display screen and the rear shell. The first wireless receiving coil is coupled to the battery and is arranged on the back side of the display screen for wirelessly charging the battery. The back side of the display screen refers to the side of the display screen facing the rear shell, also referred to as the screen side.

[0006] In the traditional technology, the wireless receiving coil is laid on the side of the back shell facing the display screen, that is, the back side of the back shell, also called the back shell side, which is referred to as a single-coil charging solution in the embodiment of the present application. It should be noted that functional devices are usually laid on the back shell side of the terminal device, resulting in a large area of ​​the back shell being occupied, such as the camera module of a mobile phone, the photoelectric volumetric pulse wave sensor of a smart watch, and so on. Relative to the back side of the back shell, the back side of the display screen has a larger area for laying the first wireless receiving coil. In this case, the laying area of ​​the above-mentioned first wireless receiving coil can be laid larger. The larger the laying area of ​​the first wireless receiving coil, the better the heat dissipation effect.

[0007] It should be understood that if the heat dissipation is not good during the charging process and the local temperature is too high, the terminal device will reduce the charging power or even stop charging to reduce the temperature, so as to ensure the safety of charging, which makes the charging speed of the terminal device slower and the charging effect worse. Therefore, the heat dissipation effect is better in the embodiment of the present application, the temperature is not easy to rise, the charging speed of the terminal device is faster, and the charging effect is better. It should be noted that the back side of the display screen is generally only paved with the front camera. For aesthetic considerations, the size of the front camera is made very small, and the area occupied is almost negligible.

[0008] In addition, since functional devices are usually placed on the back shell side of the terminal device, a large amount of space needs to be reserved on the back shell side of the terminal device for placing these functional devices. In the terminal device, the first wireless receiving coil is arranged on the screen side, which can make room for the placement of these functional devices on the back shell side. Moreover, in this embodiment, the first wireless receiving coil is arranged on the screen side. In this case, since wireless charging does not need to be performed through the back shell, the back shell can be made into a metal back shell to cater to the popular trend of metal back shells.

[0009] In some embodiments of the present application, the terminal device further includes a second wireless receiving coil, which is disposed in the terminal device and located outside the back side of the display screen, and is coupled to the battery for wirelessly charging the battery.

[0010] In this embodiment, the terminal device includes two coils, a first wireless receiving coil and a second wireless receiving coil. When one coil is damaged, the other coil can continue to be used, which can improve the charging reliability of the terminal device.

[0011] In addition, the first wireless receiving coil and the second wireless receiving coil are distributed in different positions. This embodiment of the present application refers to this coil arrangement scheme as a distributed charging scheme.

[0012] When the first wireless receiving coil and the second wireless receiving coil charge the battery, compared with the single-coil charging scheme in the traditional technology, when the two schemes provide the same charging power, the distributed charging scheme is equivalent to using two coils to jointly provide the charging power generated by the single coil in the single-coil charging scheme. In this way, in order to generate the same charging power, the distributed charging scheme is equivalent to dispersing the heat source from one location to two locations, which is conducive to increasing the heat dissipation space and dispersing the heat, so that the charging temperature of the distributed charging scheme is significantly lower than that of the single-coil charging scheme, thereby improving the situation where the terminal device is obviously hot when charging. On the contrary, it is easy to understand that when the charging temperature of the two schemes is constant, such as when there are certain requirements for the charging temperature of the terminal device (such as an upper limit requirement of 38°C), the charging power provided by the distributed charging scheme is greater than the charging power provided by the single-coil charging scheme.

[0013] When one of the first wireless receiving coil and the second wireless receiving coil is used to charge the battery, one wireless receiving coil is charged in the distributed charging scheme, and the other wireless receiving coil is not charged. In this way, when the charging wireless receiving coil needs to stop charging due to heat, the other wireless receiving coil can be used to continue charging, which can shorten the charging time.

[0014] Optionally, the second wireless receiving coil is arranged on the back side of the rear shell, and the back side of the rear shell refers to the side of the rear shell facing the display screen. In this case, the first wireless receiving coil and the second wireless receiving coil are far apart. On the one hand, the heat interference between the two can be minimized as much as possible, thereby reducing the impact on each other's heat dissipation speed; on the other hand, there is a larger heat dissipation space between the two for heat dissipation, which is conducive to accelerating heat dissipation. In this way, the charging temperature of the first wireless receiving coil and the second wireless receiving coil increases little, the restriction of the charging temperature on the charging power is reduced, the charging power can be significantly increased, the charging speed can be accelerated, and the charging time can be shortened, thereby improving the user's charging experience.

[0015] In some examples, the terminal device further includes a first control unit, a first wireless charging unit, and a first switching unit. The output end of the first wireless charging unit is coupled to the battery, and the input end of the first wireless charging unit is coupled to the output end of the first switching unit; the first control unit is coupled to the first switching unit, and the first control unit is used to control the input end of the first switching unit to be connected to at least one of the first wireless receiving coil and the second wireless receiving coil, so as to conduct the circuit between the at least one wireless receiving coil and the first wireless charging unit.

[0016] It should be understood that when the first switching unit connects the circuit between the first wireless receiving coil and the first wireless charging unit, the first wireless receiving coil charges the battery; when the first switching unit connects the circuit between the second wireless receiving coil and the first wireless charging unit, the second wireless receiving coil charges the battery; when the first switching unit connects the circuit between the first wireless receiving coil and the second wireless receiving coil and the first wireless charging unit, the first wireless receiving coil and the second wireless receiving coil charge the battery together. Through the control of the first switching unit by the first control unit, the terminal device can use one or two wireless receiving coils for charging, making the charging scheme flexible. In addition, this example can connect the circuit between any wireless receiving coil and the first wireless charging unit through the control of the first switching unit by the first control unit, thereby realizing the reuse of the first wireless charging unit, which is conducive to reducing costs and realizing the miniaturization of the terminal device.

[0017] In some designs of the present application, when the circuit between either the first wireless receiving coil or the second wireless receiving coil and the first wireless charging unit is connected, and the circuit between the other wireless receiving coil and the first wireless charging unit is disconnected, if the charging temperature of either wireless receiving coil does not meet the requirements, the first control unit is used to control the first switching unit to disconnect the circuit between either wireless receiving coil and the first wireless charging unit and connect the circuit between the other wireless receiving coil and the first wireless charging unit.

[0018] This design is based on the situation in the previous embodiment that the terminal device can use one of the first wireless receiving coil and the second wireless receiving coil to charge the battery. When the temperature of one wireless receiving coil is too high (does not meet the requirements), the first control unit can conduct the circuit between the other wireless receiving coil and the first wireless charging unit to switch the other wireless receiving coil to charge. When the temperature of the other wireless receiving coil is too high, the previous wireless receiving coil is turned on again. That is to say, in this design, one wireless receiving coil is used for charging at the same time, and the battery is charged by switching between the two wireless receiving coils. In this way, the two wireless receiving coils will charge the battery alternately, that is, the receiving end alternate charging scheme.

[0019] In the single-coil charging solution of traditional technology, only a single coil is set in the terminal device. When using this single coil for charging, its charging strategy is: when the charging temperature of the single coil reaches the preset threshold, the charging power of the single coil is usually reduced to zero (i.e. charging is stopped). As the heat dissipation proceeds, the temperature of the single coil gradually decreases. When the charging temperature of the single coil drops, the charging power is increased again, and this is repeated.

[0020] It can be seen that in the traditional technology, during the time period when the single coil stops charging, the charging power is zero, which reduces the average charging power of the entire charging process, thereby prolonging the charging time; while in this design, during the time period when one of the wireless receiving coils stops charging (assuming that the charging power of the wireless receiving coil and the single coil is the same), the charging power provided by the other wireless receiving coil is greater than zero, which increases the average charging power of the entire charging process, thereby shortening the charging time. If the average charging power provided by the alternate charging scheme at the receiving end is the same as the average charging power provided by the single coil charging scheme, the alternate charging scheme at the receiving end reduces the charging temperature of the terminal device and improves the situation where the terminal device overheats during charging.

[0021] In some embodiments of the present application, when the battery is wirelessly charged using either the first wireless receiving coil or the second wireless receiving coil, if the charging temperature of either wireless receiving coil does not meet the requirement, the terminal device is used to switch the wireless receiving coil for wireless charging of the battery from either wireless receiving coil to the other of the first wireless receiving coil and the second wireless receiving coil. In this embodiment, the first wireless receiving coil and the second wireless receiving coil also charge the battery alternately, and the effect can be seen in the previous embodiment.

[0022] At the same time, when the wireless receiving coil for wirelessly charging the battery is switched from any wireless receiving coil to another wireless receiving coil, the terminal device is also used to output a first control instruction, and the first control instruction is used to instruct the wireless charger to use the wireless transmitting coil corresponding to the other wireless receiving coil to charge the terminal device. It should be understood that only when the wireless transmitting coil corresponding to the other wireless receiving coil is charged, the other wireless receiving coil can wirelessly charge the battery.

[0023] In some other design methods of the present application, the terminal device also includes a first control unit and a first wireless charging unit; the output end of the first wireless charging unit is connected to the battery, the first wireless charging unit is connected to the first control unit, and the input end of the first wireless charging unit is also connected to the first wireless receiving coil and the second wireless receiving coil; the first control unit is used to control the first wireless receiving coil and the second wireless receiving coil to charge the battery together. In this design method, both wireless receiving coils are connected to the first wireless charging unit, which realizes the reuse of the first wireless charging unit, which is conducive to reducing costs and realizing the miniaturization of the terminal device.

[0024] In some other designs of the present application, when a first wireless receiving coil and a second wireless receiving coil are used to wirelessly charge a battery, if a charging temperature of any one of the first wireless receiving coil and the second wireless receiving coil does not meet the requirements, the terminal device is used to output a second control instruction to a wireless charger that powers the terminal device, and the second control instruction is used to instruct the wireless charger to reduce the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils.

[0025] In this design, when the first wireless receiving coil and the second wireless receiving coil are used to charge the battery together, the charging temperatures of the first wireless receiving coil and the second wireless receiving coil are controlled separately. When the charging temperature of any wireless receiving coil does not meet the requirements, the charging power of the corresponding wireless transmitting coil is reduced through the second control instruction. In this way, the charging power of the wireless receiving coil whose charging temperature does not meet the requirements will also be reduced, thereby ensuring charging safety.

[0026] Compared with the single-coil charging solution, this design uses the first wireless receiving coil and the second wireless receiving coil to charge the battery. When the charging power provided by one coil is exactly the same as the charging power provided by a single coil in the traditional technology, the charging power provided by the other coil can be used as an additional benefit, resulting in a higher average charging power and a shorter charging time. When the average charging power of the two is the same, the charging temperature of the terminal device in this design is lower, which can improve the situation where the terminal device overheats during charging.

[0027] For example, the terminal device is a smart watch. As a miniaturized product, the compact space inside the smart watch makes its heating problem prominent, which greatly limits the charging power of wireless charging. Especially for the diversified functions of smart watches, this problem is more prominent. Therefore, the above-mentioned distributed charging solution is applied to smart watches, and the effect is outstanding.

[0028] Specifically, the smart watch includes a dial; the display screen, battery and back cover all belong to the dial; the dial also includes a metal decorative part, which is located on the side of the battery facing the display screen and surrounds the display screen; wherein the metal decorative part and the first wireless receiving coil do not overlap in their orthographic projection on the back cover.

[0029] In this embodiment, the metal decorative piece surrounding the periphery of the display screen is constructed as a ring structure to form a closed loop. Therefore, during wireless charging, eddy currents will be generated under the action of electromagnetic induction, which will affect the wireless charging process of the first wireless receiving coil. In order to reduce the impact of the metal decorative piece on the wireless charging process of the first wireless receiving coil, the metal decorative piece and the first wireless receiving coil do not overlap in their orthographic projections on the back shell. Therefore, when the coil of the wireless charger and the first wireless receiving coil are aligned, the metal decorative piece will not be sandwiched between the coil of the wireless charger and the first wireless receiving coil. In this case, the electromagnetic coupling between the coil of the wireless charger and the metal decorative piece is suppressed, thereby reducing the impact of the metal decorative piece on the wireless charging process of the first wireless receiving coil.

[0030] In a second aspect, an embodiment of the present application provides a wireless charger. The wireless charger includes: a first support portion and a second support portion. A first wireless transmitting coil is arranged on the first support portion, and a second wireless transmitting coil is arranged on the second support portion; wherein, when the terminal device is located at the charging position of the wireless charger, wherein, when the terminal device is located at the charging position of the wireless charger, the terminal device is located between the first support portion and the second support portion, and the first support portion is opposite to the display screen of the terminal device so that the first wireless transmitting coil provides charging input for the first wireless receiving coil deployed in the terminal device. In this embodiment, when the terminal device is located at the charging position of the wireless charger, the terminal device is located between the first support portion and the second support portion. The first support portion and the second support portion can assist in the positioning of the terminal device, so that when the terminal device is placed at the charging position of the wireless charger, the first wireless transmitting coil can be aligned with the first wireless receiving coil, thereby improving the efficiency of wireless charging.

[0031] In some embodiments, a second wireless transmitting coil is also disposed on the second supporting portion; the second wireless transmitting coil disposed on the second supporting portion is opposite to the position of the second wireless receiving coil in the terminal device to provide charging input for the second wireless receiving coil.

[0032] In the wireless charger, the first wireless transmitting coil and the second wireless transmitting coil are distributed at different positions on the wireless charger. Like the aforementioned terminal device, the two coils are also arranged in a distributed manner. Compared with a wireless charger with a single coil, the wireless charger has a larger heat dissipation space, which can largely solve the heating problem of wireless charging, reduce the limiting effect of heating on the charging power, and thus increase the charging power of wireless charging and improve the charging speed. Moreover, the wireless charger can achieve a lower charging temperature while providing the same charging power; when the charging temperature is equivalent, the wireless charger can provide a greater charging power. For details, please refer to the description of the aforementioned related embodiments for adaptability.

[0033] In some embodiments, the second support portion is opposite to the rear shell of the terminal device. In the wireless charger, it should be understood that the display screen and the rear shell of the terminal device are arranged opposite to each other, so the first wireless transmitting coil and the second wireless transmitting coil are arranged opposite to each other in the charging state, and are distributed at two positions on the wireless charger that are far apart. In addition to having the effects of the wireless charger of the previous embodiment, when the wireless charger is used for charging, since the two are far apart, there is a large heat dissipation space between the two for heat dissipation, which is conducive to accelerating heat dissipation and reducing the damage to the wireless charger caused by excessively high charging temperature, thereby extending the service life of the wireless charger.

[0034] In some embodiments of the present application, a clamping portion is further included; the first support portion and the second support portion are respectively connected to the clamping portion, and the first support portion and the second support portion are arranged opposite to each other in the charging state; the clamping portion is used to clamp the terminal device between the first support portion and the second support portion in the charging state. In this embodiment, the clamping portion can clamp the terminal device between the first support portion and the second support portion in the charging state, which, on the one hand, makes it difficult for the terminal device to fall off, and on the other hand, helps to align the terminal device and the wireless charger to ensure charging efficiency.

[0035] Optionally, the angle between the first support portion and the second support portion is in an adjustable state. In this embodiment, the angle between the first support portion and the second support portion is set to be in an adjustable state, which can facilitate the placement and removal of the terminal device.

[0036] Exemplarily, the clamping portion includes a first clamping arm, a second clamping arm and a connecting seat; the first support portion is arranged at the first end of the first clamping arm; the second support portion is arranged at the first end of the second clamping arm; the connecting seat is rotatably connected to the second end of the first clamping arm and the second end of the second clamping arm respectively, and the first clamping arm and / or the second clamping arm can rotate around the connecting seat to adjust the angle between the first support portion and the second support portion to realize the "opening" or "closing" of the wireless charger.

[0037] This example provides an implementation scheme in which the angle between the first support part and the second support part is in an adjustable state. When charging is required, the first support part and / or the second support part can be rotated to put the wireless charger in the "on" state, and the terminal device can be placed between the first support part and the second support part; the first support part and / or the second support part can be rotated again to put the wireless charger in the "closed" state, and the terminal device can be firmly clamped between the first support part and the second support part for charging; when charging is completed, the first support part and / or the second support part can be rotated to put the wireless charger in the "on" state, and the terminal device can be taken out from between the first support part and the second support part.

[0038] In some design modes of the present application, the wireless charger is used to: when using any one of the first wireless transmitting coil or the second wireless transmitting coil to charge the terminal device, the wireless charger is used to: receive a first control instruction from the terminal device; the first control instruction is used to instruct the wireless charger to use the other of the first wireless transmitting coil and the second wireless transmitting coil to charge the terminal device; in response to the first control instruction, the wireless transmitting coil charging the terminal device is switched from one wireless transmitting coil to another wireless transmitting coil. The implementation effect of this embodiment can be adaptively referred to the implementation effect of the relevant embodiment in the aforementioned terminal device.

[0039] In some other design modes of the present application, when the first wireless transmitting coil and the second wireless transmitting coil are used to charge the terminal device together, the wireless charger is used to: receive a second control instruction from the terminal device; the second control instruction is used to instruct the wireless charger to reduce the charging power of one of the first wireless transmitting coil and the second wireless transmitting coil; in response to the second control instruction, reduce the charging power of the wireless transmitting coil indicated by the second control instruction. The implementation effect of this embodiment can be adaptively referred to the implementation effect of the relevant embodiment in the aforementioned terminal device.

[0040] In a third aspect, an embodiment of the present application also provides a wireless charging method. The wireless charging method is applied to a terminal device, in which a first wireless receiving coil and a second wireless receiving coil are deployed, the first wireless receiving coil is deployed on the back side of the display screen of the terminal device, and the second wireless receiving coil is deployed on the back side of the rear shell of the terminal device. The wireless charging method includes: in the process of wirelessly charging the terminal device by at least one of the first wireless receiving coil and the second wireless receiving coil, obtaining the charging temperature of each wireless receiving coil in at least one wireless receiving coil; adjusting the charging power of the terminal device according to the charging temperature of each wireless receiving coil.

[0041] In some embodiments, when either the first wireless receiving coil or the second wireless receiving coil is charging a terminal device, the charging power of the terminal device is adjusted according to the charging temperature of each wireless receiving coil, including: if the charging temperature of either wireless receiving coil does not meet the requirement, the other wireless receiving coil of the first wireless receiving coil and the second wireless receiving coil is used to wirelessly charge the terminal device.

[0042] In this embodiment, the so-called switching another wireless receiving coil to wirelessly charge the terminal device means that another wireless receiving coil starts charging at a certain charging power, and at the same time, the wireless receiving coil whose charging temperature does not meet the requirement stops charging, that is, the charging power is zero. It can be seen that by switching to another wireless receiving coil to wirelessly charge the terminal device, the charging power of the terminal device can be adjusted.

[0043] Optionally, when charging the terminal device by any one wireless receiving coil is switched to wirelessly charging the terminal device by using another wireless receiving coil, the above-mentioned wireless charging method also includes: sending a first control instruction to the wireless charger, and the first control instruction is used for the wireless charger to use the wireless transmitting coil corresponding to the other wireless receiving coil to wirelessly charge the terminal device.

[0044] It should be noted that in order to enable another wireless receiving coil to start charging at a certain charging power and to make the charging power of the wireless receiving coil whose charging temperature does not meet the requirement zero, it is also necessary to adjust the corresponding wireless transmitting coils to provide corresponding inputs. In this embodiment, by sending a switching instruction to the wireless charger, the wireless charger is instructed to switch the wireless transmitting coil corresponding to another wireless receiving coil to charge the terminal device, so that the charging power of the terminal device can be adjusted.

[0045] In other embodiments, when a first wireless receiving coil and a second wireless receiving coil are used to jointly perform wireless charging for a terminal device, the charging power of the terminal device is adjusted according to the charging temperature of each wireless receiving coil, including: if the charging temperature of any one of the first wireless receiving coil and the second wireless receiving coil does not meet the requirements, the terminal device is used to output a second control instruction, and the second control instruction is used to instruct the wireless charger to reduce the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils.

[0046] It should be understood that as the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils decreases, the charging power of any one of the wireless receiving coils will also decrease, thereby achieving adjustment of the charging power of the terminal device.

[0047] It can be understood that the beneficial effects that can be achieved by the technical solution in any possible design method of the third aspect provided above can be referred to the beneficial effects of the terminal device in the first aspect and any possible design method thereof, and will not be repeated here.

[0048] In a fourth aspect, an embodiment of the present application further provides a wireless charging system. The wireless charging system includes a terminal device as in the first aspect and any embodiment thereof; and a wireless charger as in the second aspect and any embodiment thereof, configured to receive an input voltage from an adapter and wirelessly charge the terminal device.

[0049] Optionally, the wireless charging system further includes an adapter; the adapter is used to couple with the wireless charger in a charging state to provide an input voltage to the wireless charger.

[0050] It can be understood that the beneficial effects that can be achieved by the technical solution in any possible design method of the fourth aspect provided above can be referred to the beneficial effects of the terminal device in the first aspect and any possible design method thereof, and the wireless charger in the second aspect and any possible design method thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A circuit schematic diagram of a wireless charging system provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of the structure of a smart watch provided in an embodiment of the present application;

[0053] Figure 3 for Figure 2 Explosion diagram of the dial of the smart watch shown Figure 1 ;

[0054] Figure 4 A distribution diagram of the position of the first wireless receiving coil on the display screen of a smart watch provided in an embodiment of the present application;

[0055] Figure 5 Schematic diagram of the explosion of the dial of the smart watch shown Figure 2 ;

[0056] Figure 6 A distribution diagram of the position of the second wireless receiving coil provided in an embodiment of the present application on the back shell of a smart watch;

[0057] Figure 7 A heat dissipation comparison diagram of the distributed charging solution and the single-coil charging solution provided in the embodiment of the present application;

[0058] Figure 8 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application;

[0059] Fig. 9 The change of charging power corresponding to the alternate charging scheme of the receiving end provided in the embodiment of the present application Figure 1 ;

[0060] Fig.10 The change of charging power corresponding to the alternate charging scheme of the receiving end provided in the embodiment of the present application Figure 2 ;

[0061] Fig.11 This is a graph showing the change in charging power corresponding to the single-coil charging solution;

[0062] Fig.12 This is the temperature variation diagram corresponding to the single-coil charging solution;

[0063] Fig.13 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application;

[0064] Fig.14 A graph showing the charging power and temperature changes of the first wireless receiving coil in the receiving-end independent charging solution provided in an embodiment of the present application;

[0065] Fig.15 A graph showing the charging power and temperature changes of the second wireless receiving coil in the receiving-end independent charging solution provided in an embodiment of the present application;

[0066] Fig.16 A circuit schematic diagram of a smart watch provided in an embodiment of the present application;

[0067] Fig.17 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application;

[0068] Fig.18 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application;

[0069] Fig.19 A schematic diagram of the structure of a wireless charger provided in an embodiment of the present application;

[0070] Fig. 20 for Figure 5 The dial and Fig.19 The schematic diagram of the wireless charger in the charging state is shown;

[0071] Fig.21 for Fig.19 A schematic diagram of the opening and closing of the wireless charger shown;

[0072] Fig. 22 An interactive diagram of a wireless charging method provided in an embodiment of the present application;

[0073] Fig.23 An interactive diagram of another wireless charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0075] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. The term "electrical connection" referred to in the embodiments of the present application, that is, "electrical connection", refers to a connection method that can transmit electrical signals.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0078] In addition, the term "and / or" can be a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0079] It should be noted that in the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplarily" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0080] The following is an explanation of the relevant technical terms involved in the embodiments of the present application.

[0081] 1. Wireless Charging

[0082] Wireless charging is a process in which the transmitter TX (such as a charger) and the receiver RX (such as a mobile phone, smart watch, etc.) each have a coil. The transmitter TX converts electrical energy into a magnetic field through the wireless transmitting coil. The magnetic field of the wireless transmitting coil passes through the wireless receiving coil of the receiving end RX. According to Faraday's law of electromagnetic induction, an electric field will be generated in the wireless receiving coil, and finally the receiving end RX outputs electrical energy to achieve charging.

[0083] It should be noted that during the wireless charging process, the closer the wireless transmitting coil and the wireless receiving coil are, the higher the wireless charging efficiency; the more aligned the centers of the wireless transmitting coil and the wireless receiving coil are, the higher the wireless charging efficiency.

[0084] For example, please refer to Figure 1 , Figure 1 A circuit schematic diagram of a wireless charging system provided in an embodiment of the present application.

[0085] The wireless charging system includes a transmitter TX and a receiver RX. The transmitter TX corresponds to a wireless charger. The receiver RX corresponds to a terminal device with a wireless charging function, such as a mobile phone, a wearable device (such as a smart watch, a smart bracelet), etc. In some embodiments, the wireless charging system may also include an adapter for providing an input voltage to the wireless charger. The wireless charger is used to receive the input voltage of the adapter to charge the terminal device.

[0086] The terminal device is provided with a wireless receiving coil that can receive electromagnetic signals. Thus, when the terminal device is placed on the charging position of the wireless charger, the wireless transmitting coil provided in the wireless charger can be coupled with the wireless receiving coil provided in the terminal device, and the wireless charger transmits a wireless charging signal to the terminal device through the coupled wireless transmitting coil and wireless receiving coil, thereby wirelessly charging the terminal device.

[0087] Specifically, for example, the transmitting end TX may include a microcontroller unit (MCU) 11, a power bridge 12, and an LC resonant circuit 13 composed of an inductor and a capacitor. The inductor in the LC resonant circuit 13 can be used as a wireless transmitting coil in a wireless charger. The receiving end RX may include an LC resonant circuit 21 composed of an inductor and a capacitor, a rectifier bridge 22, a low dropout regulator (LDO) 23, a charger chip 24, a battery 25, and an MCU 26. The inductor in the LC resonant circuit 21 can be used as a wireless receiving coil in a terminal device.

[0088] The capacitors in the LC resonant circuit 13 and the capacitors in the LC resonant circuit 21 can be used for tuning so that the charging efficiency is optimized when the resonant frequencies of the LC resonant circuit 13 and the LC resonant circuit 21 are at a resonant frequency. The typical resonant frequency is 130 kHz. The impedance of the capacitor in the LC resonant circuit 13 can be adjusted by the MCU 11, and the capacitor in the LC resonant circuit 21 can be adjusted by the MCU 26.

[0089] The transmitting end TX receives a DC voltage (i.e., input voltage Vin) from the outside (such as an adapter), and the DC voltage is converted into an AC voltage through a power bridge 12. The AC voltage generates an AC current in the LC resonant circuit 13, and the AC current generates a magnetic field through the wireless transmitting coil. The receiving end RX senses the magnetic field generated by the wireless transmitting coil, generates an AC current in the LC resonant circuit 21, and the AC current is converted into a DC voltage through a rectifier bridge 22. The DC voltage is converted into a voltage suitable for the battery through LDO23 and a charger chip 24 to charge the battery 25. The charger chip 24 can also be used to monitor parameters such as the battery capacity, battery cycle number, charging status, and battery health status (leakage, impedance) of the battery 25.

[0090] Each switch of the power bridge 12 is controlled based on a pulse width modulation (PWM) square wave, thereby realizing direct current to alternating current. Specifically, the MCU11 can transmit a PWM square wave to each switch of the power bridge 12, and each switch of the power bridge 12 is alternately opened and closed under the control of the PWM square wave, thereby converting the DC voltage into an AC voltage. It should be noted that the duty cycle and frequency of PWM will affect the power of the AC voltage converted by the power bridge 12. Based on this, the MCU11 of the transmitter TX can control the energy of the transmitter TX by controlling the frequency and / or duty cycle of the PWM square wave, thereby achieving the purpose of reducing or increasing the charging power. In addition, the input voltage Vin will also affect the power of the AC voltage, and the charging power can also be adjusted by adjusting the amplitude of the input voltage Vin.

[0091] When the receiving end RX needs to convey information to the transmitting end TX (such as requesting the transmitting end TX to reduce or increase the charging power, etc.), a group of capacitors (shown as C1 and C2) can be connected or disconnected on both sides of the LC resonant circuit of the receiving end RX under the control of MCU26. The connection or disconnection of the capacitor will cause the equivalent impedance of the LC resonant circuit of the transmitting end TX to change. The change in equivalent impedance will cause the current of the LC resonant circuit of the transmitting end TX to change, and the voltage at the connection point between the capacitor and the inductor to change. This changing signal will be collected and demodulated, and transmitted to the MCU11 of the transmitting end TX. The entire change rule is written in the protocol, and the MCU11 of the transmitting end TX can obtain the information transmitted by the receiving end RX through the protocol.

[0092] In traditional technology, the wireless receiving coil in the terminal device is laid on the side of the back shell facing the display screen, that is, the back side of the back shell, also called the back shell side. However, since functional devices (such as the camera module of the mobile phone, the PPG sensor of the smart watch, etc.) are usually laid on the back shell side of the terminal device, the back shell is occupied by a large area. In this case, if the wireless receiving coil is laid on the side of the back shell facing the display screen, the laying area of ​​the wireless receiving coil is relatively small, and the small laying area will have poor heat dissipation effect, which will cause the terminal device to heat up. The current wireless charging is subject to the problems of charging power and heat generation, and the charging speed is relatively slow. Heat generation is a major factor limiting the charging power.

[0093] Based on this, an embodiment of the present application provides a terminal device that can be applied to the above-mentioned wireless charging system. In the terminal device, the first wireless receiving coil is laid on the back side of the display screen of the terminal device. Since the number of functional components laid on the back side of the display screen relative to the side of the rear shell facing the display screen is very small, for example, only the front camera is generally laid on the back side of the display screen. For aesthetic considerations, the size of the front camera is made very small and the area occupied is almost negligible. Therefore, relative to the back side of the rear shell, the back side of the display screen has a larger area for laying the first wireless receiving coil for wireless charging of the terminal device, and the larger the laying area of ​​the first wireless receiving coil, the larger the heat dissipation area of ​​the first wireless receiving coil, and the better the heat dissipation effect.

[0094] It should be understood that if the heat dissipation is not good during the charging process and the local temperature is too high, the terminal device will reduce the charging power or even stop charging to reduce the temperature, so as to ensure charging safety, which makes the charging speed of the terminal device slower and the charging effect worse. Since the first wireless receiving coil is laid on the back side of the display screen in the embodiment of the present application, the heat dissipation effect is better in the embodiment of the present application, the temperature is not easy to rise, and the influence of heat on the charging efficiency is reduced, so the charging speed of the terminal device is faster and the charging effect is better.

[0095] It should be noted that usually only the front camera is installed on the back of the display screen. For aesthetic reasons, the size of the front camera is made very small and the area it occupies is almost negligible.

[0096] In addition, since functional devices are usually placed on the back shell side of the terminal device, a large amount of space needs to be reserved on the back shell side of the terminal device for placing these functional devices. In the terminal device, the first wireless receiving coil is arranged on the screen side, which can make room for the placement of these functional devices on the back shell side. Moreover, in this embodiment, the first wireless receiving coil is arranged on the screen side. In this case, since wireless charging does not need to be performed through the back shell, the back shell can be made into a metal back shell to cater to the popular trend of metal back shells.

[0097] The terminal device, wireless charger and wireless charging system provided in the embodiments of the present application are described below in conjunction with the accompanying drawings.

[0098] For example, please refer to Figure 2 , Figure 2 The smart watch 100 is a schematic diagram of a smart watch according to an embodiment of the present application. The smart watch 100 includes a dial 110 and a strap 120 .

[0099] The strap 120 is a structure for wearing the smart watch 100 on the wrist.

[0100] The dial 110 may be loaded with functional components for implementing the functions of the smart watch 10. For example, the functions of the smart watch 100 may include, but are not limited to, physiological parameter (such as pulse, heart rate, etc.) detection function, time display function, communication function, display function, and the like.

[0101] For example, please refer to Figure 3 , Figure 3 for Figure 2 Explosion diagram of the dial of the smart watch shown Figure 1 .

[0102] The dial 110 includes a display screen 111, a first wireless receiving coil 112, a watch body 113 and a rear shell 114 which are sequentially stacked along the Z direction shown in the figure. The Z direction can be understood as the thickness direction of the dial 110.

[0103] The display screen 111 is used to display images, videos, texts, etc. to realize the display function of the smart watch 100 .

[0104] The first wireless receiving coil 112 is used to receive a first wireless charging input provided by a wireless charger to charge the battery 115. The wireless charger may be a wireless charger of the smart watch 100 or other devices that can wirelessly charge the smart watch 100.

[0105] The watch body 113 is used as an exterior part of the smart watch 100 and is also used to accommodate functional components such as a battery 115 and a circuit board (not shown in the figure). The battery 115 is used to power the functional components of the smart watch 100 that need power. The circuit board is used to carry and electrically connect the functional components of the smart watch 100.

[0106] Specifically, the watch body 113 is constructed as a ring structure extending along the Z direction, that is, the axial direction of the ring structure is the Z direction. The space enclosed by the watch body 113 constructed as a ring structure is used as the above-mentioned accommodation space to accommodate the functional components of the smart watch 100 that need to be hidden.

[0107] The rear case 114 is used for protection and decoration. When the smart watch 100 is worn on a wrist, the rear case 114 contacts the wrist.

[0108] Figure 3 In the illustrated embodiment, the display screen 111 and the rear shell 114 are arranged opposite to each other, and the battery 115 is arranged between the display screen 111 and the rear shell 114. The first wireless receiving coil 112 is arranged on the side of the display screen 111 facing the rear shell 114, that is, the back side of the display screen 111. In this embodiment, when charging is required, taking a wireless charger as an example, the display screen 111 of the smart watch 100 is aligned with the wireless charger, and the wireless charger provides a first wireless charging input to the first wireless receiving coil 112 through the display screen 111, and the first wireless receiving coil 112 receives the first wireless charging input to charge the battery 115.

[0109] It is understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the smart watch. In other embodiments of the present application, the smart watch may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently.

[0110] Figure 3 In the dial 110 shown, the back cover 114 is usually laid with a PPG sensor, etc. Compared with the back cover 114, the back side of the display screen 111 has a larger area for laying the first wireless receiving coil 112. In this case, the laying area of ​​the first wireless receiving coil 112 can be larger. The larger the laying area of ​​the first wireless receiving coil 112, the better the heat dissipation effect, the temperature is not easy to rise during charging, the charging speed of the smart watch 100 is faster, and the charging effect is better.

[0111] In addition, since the back shell side of the smart watch 100 is usually equipped with functional components, a large amount of space needs to be reserved on the back shell side of the terminal device for these functional components to be installed. Figure 3 In the embodiment, the first wireless receiving coil 112 is arranged on the screen side, which can free up space for the arrangement of these functional components on the back shell side. In addition, in this embodiment, the first wireless receiving coil 112 is arranged on the screen side. In this case, since wireless charging does not need to be performed through the back shell 114, the back shell 114 can be made into a metal back shell to cater to the popular trend of metal back shells.

[0112] It should be noted that the wiring of the display screen 111 is metal. When the first wireless receiving coil 112 is charged through the display screen 111, the wiring of the display screen 111 is similar to the first wireless receiving coil 112, and both will generate eddy currents under the action of electromagnetic induction, thereby affecting the wireless charging process of the first wireless receiving coil 112, which is specifically manifested in the following two aspects:

[0113] First, because the wiring of the display screen 111 generates eddy currents under the action of electromagnetic induction, heat is generated near the display screen 111 .

[0114] Second, since the wiring of the display screen 111 divides away part of the energy under the effect of electromagnetic induction, it will affect the wireless charging efficiency of the first wireless receiving coil 112.

[0115] However, the wiring of the display screen 111 is very thin, the impedance is relatively large, and the conductivity is relatively low. The impact of the wiring of the display screen 111 on the wireless charging efficiency and the eddy currents generated during the wireless charging process are both relatively low. According to the simulation results of the first wireless receiving coil 112 being affected by the display screen 111, the impact of the wiring of the display screen 111 on the wireless charging efficiency can be ignored, and the eddy currents generated during the wireless charging process are also very small, and the heating caused by the eddy currents is not obvious. In addition, in this embodiment, the first wireless receiving coil 112 is laid on the back side of the display screen 111, which can enhance the heat dissipation effect of the first wireless receiving coil 112, so that the heat generated by the eddy currents is further suppressed.

[0116] Please continue to refer to Figure 3 Optionally, the dial 110 further includes a metal decorative part 116. The metal decorative part 116 is located on the side of the battery 115 facing the display screen 111, and surrounds the periphery of the display screen 111 to decorate the edge of the display screen 111. Of course, in other embodiments, the metal decorative part 116 can also be replaced with a decorative part of other materials. It should be understood that the metal decorative part 116 surrounding the periphery of the display screen 111 is constructed as a ring structure to form a closed loop. Therefore, during wireless charging, eddy currents will also be generated under the action of electromagnetic induction, which will affect the wireless charging process of the first wireless receiving coil 112.

[0117] In order to reduce the influence of the metal decoration 116 on the wireless charging process of the first wireless receiving coil 112, in some embodiments of the present application, the metal decoration 116 and the first wireless receiving coil 112 do not overlap in their orthographic projections on the back shell 114. In this way, the metal decoration 116 and the first wireless receiving coil 112 do not overlap in the thickness direction of the smart watch 100.

[0118] For example, please refer to Figure 4 , Figure 4 The distribution diagram of the position of the first wireless receiving coil on the display screen of the smart watch provided in the embodiment of the present application. The dotted line in the figure represents the first wireless receiving coil 112, and the figure illustrates the position relationship between the first wireless receiving coil and the metal decorative part 116.

[0119] Depend on Figure 4It can be seen that the first wireless receiving coil 112 laid on the back side of the display screen 111 is located within the edge of the display screen 111, that is, it does not exceed the boundary of the display screen 111. In this way, the metal decorative part 116 and the first wireless receiving coil 112 do not overlap in the thickness direction of the smart watch 100.

[0120] It should be understood that the wireless transmitting coil of the wireless charger is designed to cooperate with the first wireless receiving coil 112, so the coil of the wireless charger can be aligned (center aligned) with the first wireless receiving coil 112 for charging to obtain good wireless charging efficiency. Since the metal decorative part 116 and the first wireless receiving coil 112 do not overlap in the Z direction, when the coil of the wireless charger and the first wireless receiving coil 112 are aligned, the metal decorative part 116 will not be sandwiched between the coil of the wireless charger and the first wireless receiving coil 112. In this case, the electromagnetic coupling between the coil of the wireless charger and the metal decorative part 116 is suppressed, thereby reducing the impact of the metal decorative part 116 on the wireless charging process of the first wireless receiving coil 112.

[0121] It should be noted that the smart watch 100 has more and more functions. At present, the commonly used smart watch 100 must not only support the near field communication (NFC) function, but also need to have Bluetooth function, global positioning system (GPS) positioning function and embedded subscriber identity module (ESIM) function. With the diversification of the functions of the smart watch 100, the standby time of the smart watch 100 has been greatly shortened, and there is an urgent requirement for the charging speed of the smart watch 100. However, due to the problems of charging power and heat generation, the wireless charging speed of the smart watch 100 is relatively slow. Heat generation is a major factor that directly limits the charging power. How to solve the problem of slow wireless charging speed of the smart watch 100 is mainly to solve the problems of charging heat generation and charging power. Based on this, the embodiments of the present application also provide Figure 5 The distributed charging scheme shown.

[0122] For example, please refer to Figure 5 , Figure 5 for Figure 2 The exploded view of the dial 110 of the smart watch 100 is shown Figure 2 .

[0123] Different from Figure 3 , Figure 5The watch dial 110 shown further includes a second wireless receiving coil 117 . The second wireless receiving coil 117 is used to receive a second wireless charging input provided by a wireless charger to wirelessly charge the battery 115 .

[0124] The second wireless receiving coil 117 is disposed on the side of the rear housing 114 facing the display screen 111, that is, the back side of the rear housing 114. In order to avoid the influence of the rear housing 114 on wireless charging, the entire rear housing 114 can be made of plastic material. Of course, only the position occupied by the second wireless receiving coil 117 can be made of plastic material.

[0125] It should be noted that, in some embodiments, a PPG sensor or other device may be disposed on the back side of the rear shell 114 , and the PPG sensor or other device will occupy the back side of the rear shell 114 . Based on this, the second wireless receiving coil 117 needs to avoid the PPG sensor or other device.

[0126] For example, please refer to Figure 6 , Figure 6 The distribution diagram of the position of the second wireless receiving coil of the smart watch provided in the embodiment of the present application on the back shell. The dotted line in the figure represents the second wireless receiving coil 117. Figure 6 It can be seen that there are reserved spaces in the area of ​​the rear shell 114 located outside the second wireless receiving coil 117 , and these spaces can be used for laying devices such as PPG sensors.

[0127] Please continue to refer to Figure 5 , Figure 5 The illustrated embodiment is provided with two wireless receiving coils, a first wireless receiving coil 112 and a second wireless receiving coil 117. The two wireless receiving coils are separately distributed at two different positions on the screen side and the back shell side. The embodiment of the present application refers to this coil arrangement scheme as a distributed charging scheme. It should be understood that in other embodiments, the second wireless receiving coil 117 may also be arranged at other positions different from the first wireless receiving coil 112, so that the first wireless receiving coil 112 and the second wireless receiving coil 117 are distributed at different positions. For example, in other product forms of terminal devices (non-smart watch product forms), when there is space for laying coils on the side of the terminal device between the display screen and the back shell, the second wireless receiving coil may also be arranged on the side.

[0128] In the distributed charging scheme, when the first wireless receiving coil 112 and the second wireless receiving coil 117 are used to charge the battery, compared with the single-coil charging scheme in the traditional technology, when the charging power provided by the single-coil charging scheme is the same as the charging power provided by the distributed charging scheme (i.e., at the same charging power), the distributed charging scheme is equivalent to using two wireless receiving coils to jointly provide the charging power generated by the single coil charging scheme using a single coil. In this way, on the one hand, the charging power required to be provided by a single wireless receiving coil in the distributed charging scheme is lower, the heat generated is naturally less, and the charging temperature of the wireless receiving coil is lower; on the other hand, in order to generate the same charging power, the distributed charging scheme is equivalent to dispersing the heat source from one position to two positions, which is conducive to increasing the heat dissipation space and dispersing the heat, so that the charging temperature of the coil in the distributed charging scheme is significantly lower than that of the single-coil charging scheme, thereby improving the situation where the smart watch 100 is obviously hot when charging. It can be seen that when the charging power provided by the distributed charging scheme is the same as the charging power provided by the single-coil charging scheme, the former has a lower charging temperature.

[0129] Please refer to Figure 7 , Figure 7 A heat dissipation comparison diagram of the distributed charging solution and the single-coil charging solution provided in the embodiments of the present application.

[0130] Figure 7 (a) is a heat dissipation schematic diagram of a single-coil charging solution, in which only a second wireless receiving coil 117 is provided; Figure 7 (b) is a schematic diagram of heat dissipation of a distributed charging solution, in which a first wireless receiving coil 112 and a second wireless receiving coil 117 are provided.

[0131] By comparison, we can find that Figure 7 In (b), by dispersing the heat source, the space between the first wireless receiving coil 112 and the second wireless receiving coil 117 can be used for heat dissipation. For example, the large space between the second wireless receiving coil 117 and the first wireless receiving coil 112 can be used for heat dissipation. Figure 7 In (a), the heat source is only the second wireless receiving coil 117, so only the space where the second wireless receiving coil 117 is located can be used for heat dissipation. The heat dissipation space is small, the heat dissipation is not ideal, the charging temperature of the coil rises quickly, and it is easy to exceed the limit value, resulting in a reduction in charging power. The reduction in charging power directly leads to a longer charging time and a slower charging speed, which makes the user's charging experience worse. Figure 7 For the single-coil charging solution shown in (a), Figure 7 The distributed charging solution shown in (b) has a larger heat dissipation space, so Figure 7In the distributed charging solution shown in (b) of FIG. 1 , the coil dissipates heat faster and the charging temperature is lower. It should be understood that the lower the charging temperature, the lower the restriction of the charging temperature on the charging power, the charging power can be significantly increased, the charging speed can be accelerated, and the charging time can be shortened, thereby improving the user's charging experience.

[0132] On the contrary, it is easy to understand that when the charging temperature requirements of the distributed charging scheme and the single-coil charging scheme are the same, such as when there are certain requirements for the charging temperature of the smart watch 100 (such as an upper limit requirement of 38°C), the charging power that the distributed charging scheme can provide is bound to be greater than the charging power provided by the single-coil charging scheme. Since each wireless receiving coil in the distributed charging scheme can adjust the charging power within the charging power range limited by the upper limit requirement of the charging temperature, therefore, when the charging temperature requirements of the two are the same, the second wireless receiving coil 117 can be adjusted to the same charging power as the single wireless receiving coil in the single-coil charging scheme. In this case, the charging power of the first wireless receiving coil 112 can be additionally benefited, which makes the charging power provided by the distributed charging scheme higher than the charging power provided by the single-coil charging scheme, thereby improving the charging speed, increasing the charging efficiency, and shortening the charging time.

[0133] Exemplarily, it is assumed that the heat dissipation environment of the second wireless receiving coil 117 and the first wireless receiving coil 112 is basically the same, the upper limit requirement of the charging temperature of the wearable device is 38°, and the maximum charging power supported by the smart watch 100 is Pall; the charging power of a single coil in the single-coil charging scheme is Pone, and the charging power of the distributed charging scheme is Pdis. Then summarize the following relationship: Pall>=Pone, Pall>=Pdis. When the charging temperature limit Pone is close to Pall, then Pdis is close to Pall, and Pdis>Pone. When the temperature environment of each receiving coil of the distributed charging scheme is consistent with that of a single coil in the single-coil charging scheme, and Pall>2*Pone, then Pdis>2*Pone. In other words, when the maximum power supported by the smart watch 100 is significantly greater than the charging power of a single coil in the single-coil charging scheme, the charging power that can be provided by the distributed charging scheme is significantly greater than the charging power of a single coil in the single-coil charging scheme, the effective charging power is significantly improved, and the charging time is significantly shortened.

[0134] For example, assuming that the heat dissipation conditions of the first wireless receiving coil 112 and the second wireless receiving coil 117 in the distributed charging scheme and the heat dissipation conditions of the second wireless receiving coil 117 in the single-coil charging scheme are the same, then the charging power of the first wireless receiving coil 112 and the charging power of the second wireless receiving coil 117 in the distributed charging scheme can be the same as the charging power of the second wireless receiving coil 117 in the single-coil charging scheme. In this case, the average charging power of the distributed charging scheme can be doubled, the charging speed can be doubled, and the charging time can be shortened by half.

[0135] The following is an explanation from the perspective of circuit implementation. Figure 5 The smart watch 100 is shown for illustration.

[0136] For example, please refer to Figure 8 , Figure 8 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application.

[0137] The receiving end RX of the wireless charging system is the above-mentioned smart watch 100. Figure 8 It can be seen that the smart watch 100 further includes a first control unit 183, a first wireless charging unit 184 and a first switching unit 185. The output end of the first wireless charging unit 184 is coupled to the battery 115, and the input end of the first wireless charging unit 184 is coupled to the output end of the first switching unit 185; the first control unit 183 is coupled to the first switching unit 185, and is used to control the input end of the first switching unit 185 to be connected to at least one of the first wireless receiving coil 112 and the second wireless receiving coil 117, so as to conduct the loop between the at least one wireless receiving coil and the first wireless charging unit 184.

[0138] In some embodiments, the first switching unit 185 can be implemented by two single-pole double-throw switches. In this case, the first switching unit 185 can realize the circuit conduction between one of the first wireless receiving coil 112 and the second wireless receiving coil 117 and the first wireless charging unit 184 under the control of the first control unit 183.

[0139] For details, please refer to Figure 8 , the first control unit 183 can refer to Figure 1 The MCU26 of the receiving end RX shown understands.

[0140] The first wireless charging unit 184 may include a rectifier bridge, an LDO, and a charger chip, etc. The functions of each unit may refer to Figure 1The rectifier bridge 22, LDO 23 and charger chip 24 of the receiving end RX are shown. The first input end and the second input end of the rectifier bridge are used as the input end of the first wireless charging unit 184, and the output end of the charger chip is used as the output end of the first wireless charging unit 184.

[0141] The first switching unit 185 may include two single-pole double-throw switches, namely, a single-pole double-throw switch 1851 and a single-pole double-throw switch 1852, wherein the third terminals of the single-pole double-throw switch 1851 and the single-pole double-throw switch 1852 may be used as the output end of the first switching unit 185. The first wireless receiving coil 112 is used as the inductor in the first LC resonant circuit 181, and the second wireless receiving coil 117 is used as the inductor in the second LC resonant circuit 182. The first LC resonant circuit 181 and the second LC resonant circuit 182 may refer to Figure 1 Of course, in other embodiments, the specific implementation of each unit may be different, and the embodiment of the present application does not limit this, as long as each unit can perform its corresponding function.

[0142] Among them, the first terminal and the second terminal of the single-pole double-throw switch 1851 are respectively coupled to the first end of the first wireless receiving coil 112 and the first end of the second wireless receiving coil 117; the first terminal and the second terminal of the single-pole double-throw switch 1852 are respectively coupled to the second end of the first wireless receiving coil 112 and the second end of the second wireless receiving coil 117; the third terminal of the single-pole double-throw switch 1851 and the third terminal of the single-pole double-throw switch 1852 are respectively coupled to the first input end (i.e., the first input end of the rectifier bridge) and the second input end (i.e., the second input end of the rectifier bridge) of the first wireless charging unit 184.

[0143] Among them, when the "pole" of the single-pole double-throw switch 1851 and the single-pole double-throw switch 1852 is placed at the first terminal, the single-pole double-throw switch 1851 and the single-pole double-throw switch 1852 connect the third terminal and the first terminal, and this situation is regarded as the input end of the first switching unit 185 being connected to the first wireless receiving coil 112; when the "pole" of the single-pole double-throw switch 1851 and the single-pole double-throw switch 1852 is placed at the second terminal, the single-pole double-throw switch 1851 and the single-pole double-throw switch 1852 connect the third terminal and the second terminal, and this situation is regarded as the input end of the first switching unit 185 being connected to the second wireless receiving coil 117.

[0144] The first control unit 183 can be used to control the single-pole double-throw switch 1851 to connect the third terminal with the first terminal, and control the single-pole double-throw switch 1852 to connect the third terminal with the first terminal, so as to realize the connection of the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184. In this case, the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184 is disconnected; it can also be used to control the single-pole double-throw switch 1851 to connect the third terminal with the second terminal, and control the single-pole double-throw switch 1852 to connect the third terminal with the second terminal, so as to realize the connection of the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184. In this case, the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184 is disconnected.

[0145] It should be understood that when the loop between the first wireless receiving coil 112 and the first wireless charging unit 184 is connected and the loop between the second wireless receiving coil 117 and the first wireless charging unit 184 is disconnected, the first wireless receiving coil 112 and the first wireless transmitting coil 220 of the wireless charger 200 undergo electromagnetic induction, thereby generating an alternating current to supply the first wireless charging unit 184. The first wireless charging unit 184 is used to convert the alternating current generated by the first wireless receiving coil 112 into a direct current suitable for charging the battery 115 to charge the battery 115.

[0146] When the loop between the second wireless receiving coil 117 and the first wireless charging unit 184 is connected and the loop between the first wireless receiving coil 112 and the first wireless charging unit 184 is disconnected, the second wireless receiving coil 117 and the second wireless transmitting coil 230 of the wireless charger 200 are electromagnetically induced, thereby generating an alternating current to supply the first wireless charging unit 184. The first wireless charging unit 184 is used to convert the alternating current generated by the second wireless receiving coil 117 into a direct current suitable for charging the battery 115 to charge the battery 115. In this embodiment, the first wireless receiving coil 112 and the second wireless receiving coil 117 both charge the battery 115 via the first wireless charging unit 184, thereby realizing the sharing of the first wireless charging unit 184, which is conducive to reducing costs and realizing the miniaturization of the smart watch 100.

[0147] Based on this, Figure 8In the embodiment, the first control unit 183 can be used to control the first switching unit 185 to connect the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184, and disconnect the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184, so that the smart watch 100 uses the first wireless receiving coil 112 to wirelessly charge the battery 115 (hereinafter, the first wireless receiving coil 112 wirelessly charging the battery 115 is referred to as charging the first wireless receiving coil 112); it can also be used to control the first switching unit 185 to connect the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184, and disconnect the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184, so that the smart watch 100 uses the second wireless receiving coil 117 to charge the battery 115 (hereinafter, the second wireless receiving coil 117 wirelessly charging the battery 115 is referred to as charging the second wireless receiving coil 117).

[0148] visible, Figure 8 In the illustrated embodiment, the first control unit 183 controls the first switching unit 185 so that the circuit between one of the first wireless receiving coil 112 and the second wireless receiving coil 117 and the first wireless charging unit 184 is connected, so that one of the two wireless receiving coils can be selected to charge the battery 115.

[0149] based on Figure 8 In the circuit scheme of the receiving end RX shown in the figure, the smart watch 100 can switch between the first wireless receiving coil 112 and the second wireless receiving coil 117 as the wireless receiving coil for wirelessly charging the battery 115, so that the first wireless receiving coil 112 and the second wireless receiving coil 117 alternately charge the battery 115 wirelessly. This charging scheme is referred to as a receiving end alternating charging scheme in the embodiment of the present application.

[0150] Specifically, in the receiving end alternating charging scheme, when using either the first wireless receiving coil 112 or the second wireless receiving coil 117 to wirelessly charge the battery 115, if the charging temperature of either wireless receiving coil does not meet the requirements (for example, the charging temperature is greater than or equal to the first temperature threshold), the smart watch 100 is used to switch the wireless receiving coil for wireless charging the battery 115 from either wireless receiving coil to the other wireless receiving coil of the first wireless receiving coil 112 and the second wireless receiving coil 117.

[0151] Optionally, when the wireless receiving coil for wireless charging of the battery 115 is switched from any wireless receiving coil to another wireless receiving coil, the smart watch 100 is further used to output a first control instruction, the first control instruction is used to instruct the wireless charger 200 to use the wireless transmitting coil corresponding to another wireless receiving coil to charge the smart watch 100, that is, to instruct the wireless charger 200 to switch another wireless transmitting coil to charge the smart watch 100. The charging temperature refers to the temperature during the charging process of the battery 115. In the embodiment of the present application, the charging temperature of the first wireless receiving coil 112 is referred to as the first charging temperature, and the charging temperature of the second wireless receiving coil 117 is referred to as the second charging temperature.

[0152] Optionally, in the embodiment of the present application, the first temperature thresholds corresponding to the first wireless receiving coil 112 and the second wireless receiving coil 117 may be the same or different. For example, when the laying area of ​​the first wireless receiving coil 112 is larger than the laying area of ​​the second wireless receiving coil 117, the first temperature threshold corresponding to the first wireless receiving coil 112 may be set higher than the first temperature threshold corresponding to the second wireless receiving coil 117. For the sake of distinction, in the embodiment of the present application, the first temperature threshold corresponding to the first wireless receiving coil 112 is referred to as the first preset threshold, and the first temperature threshold corresponding to the second wireless receiving coil 117 is referred to as the second preset threshold. The first preset threshold and the second preset threshold can be set as needed, and may be the same or different. Among them, the charging temperature of the first wireless receiving coil 112 meets the requirements, which means that the first charging temperature is less than the first preset threshold; the charging temperature of the first wireless receiving coil 112 does not meet the requirements, which means that the first charging temperature is greater than or equal to the first preset threshold. The charging temperature of the second wireless receiving coil 117 meets the requirements, which means that the second charging temperature is less than the second preset threshold; the charging temperature of the second wireless receiving coil 117 meets the requirements, which means that the second charging temperature is greater than or equal to the second preset threshold.

[0153] For the sake of ease of distinction, the first control instruction used to instruct the wireless charger 200 to switch from using the wireless transmitting coil corresponding to the second wireless receiving coil 117 to using the wireless transmitting coil corresponding to the first wireless receiving coil 112 will be referred to as the first switching instruction, and the first control instruction used to instruct the wireless charger 200 to switch from using the wireless transmitting coil corresponding to the first wireless receiving coil 112 to using the wireless transmitting coil corresponding to the second wireless receiving coil 117 to charge the smart watch 100 will be referred to as the second switching instruction.

[0154] In addition, in the subsequent embodiments of the present application, “switching the wireless receiving coil for wirelessly charging the battery 115 from any one of the wireless receiving coils to the other of the first wireless receiving coil 112 and the second wireless receiving coil 117” is referred to as “switching the other wireless receiving coil for charging”. For example, “switching the wireless receiving coil for wirelessly charging the battery 115 from the first wireless receiving coil 112 to the second wireless receiving coil 117” is referred to as “switching the second wireless receiving coil 117 for charging”; for another example, “switching the wireless receiving coil for wirelessly charging the battery 115 from the second wireless receiving coil 117 to the first wireless receiving coil 112” is referred to as “switching the first wireless receiving coil 112 for charging”. Other similar descriptions involved later shall also be understood in this way.

[0155] Based on this, the above-mentioned alternating charging scheme of the receiving end can be expressed as: when using the first wireless receiving coil 112 to wirelessly charge the battery 115, if the first charging temperature is greater than or equal to the first preset threshold, the smart watch 100 is used to switch the second wireless receiving coil 117 for charging, that is, the second wireless receiving coil 117 is used for charging, and the first wireless receiving coil 112 is stopped to charge the battery 115 of the terminal device.

[0156] Optionally, in the case of switching to charging the second wireless receiving coil 117, the smart watch 100 is further used to output a second switching instruction to the wireless charger 200. The second switching instruction is used to instruct the wireless charger 200 to switch from using the wireless transmitting coil corresponding to the first wireless receiving coil 112 (i.e., the second wireless transmitting coil 230 shown in the figure) to using the wireless transmitting coil corresponding to the second wireless receiving coil 117 (i.e., the second wireless transmitting coil 230 shown in the figure) to charge the smart watch 100, that is, to instruct the wireless charger 200 to switch the wireless transmitting coil corresponding to the second wireless receiving coil 117 to charge the smart watch 100.

[0157] When the second wireless receiving coil 117 is used to charge the battery 115 of the terminal device, if the charging temperature of the second wireless receiving coil 117 does not meet the requirements, the smart watch 100 is used to switch to charging the first wireless receiving coil 112, that is, the first wireless receiving coil 112 is used for charging, and the second wireless receiving coil 117 is stopped to charge the battery 115 of the terminal device.

[0158] Optionally, in the case of switching to charging the first wireless receiving coil 112, the smart watch 100 is further used to output a first switching instruction to the wireless charger 200. The first switching instruction is used to instruct the wireless charger 200 to switch from using the wireless transmitting coil corresponding to the second wireless receiving coil 117 (i.e., the second wireless transmitting coil 230 shown in the figure) to using the wireless transmitting coil corresponding to the first wireless receiving coil 112 (i.e., the first wireless transmitting coil 220 shown in the figure) to charge the smart watch 100, that is, to instruct the wireless charger 200 to switch the first wireless transmitting coil to charge the smart watch 100.

[0159] Combine the following Figure 8 This embodiment is described in detail from the perspective of implementation at the circuit level.

[0160] Please continue to refer to Figure 8 , when the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184 is connected, and the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184 is disconnected, so that the smart watch 100 uses the first wireless receiving coil 112 to charge the battery 115, if the first charging temperature is greater than or equal to the first preset threshold, the first control unit 183 is used to control the first switching unit 185 to connect the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184. In this case, the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184 is disconnected, so that the smart watch 100 uses the second wireless receiving coil 117 for charging, thereby switching the second wireless receiving coil 117 for charging. Optionally, in the case of switching the second wireless receiving coil 117 for charging, the first control unit 183 is also used to control the smart watch 100 to output a second switching instruction, so that the wireless charger 200 provides a second wireless charging input to charge the smart watch 100, and the second wireless receiving coil 117 is used to receive the second wireless charging input and generate an alternating current. Since the loop between the second wireless receiving coil 117 and the first wireless charging unit 184 is connected, the alternating current generated by the second wireless receiving coil 117 is provided to the first wireless charging unit 184 to wirelessly charge the battery 115 .

[0161] When the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184 is connected, and the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184 is disconnected, so that the smart watch 100 is charged by the second wireless receiving coil 117, if the second charging temperature is greater than or equal to the first preset threshold, the first control unit 183 is used to control the first switching unit 185 to connect the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184. In this case, the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184 is disconnected, thereby switching the first wireless receiving coil 112 for charging. Optionally, when switching the first wireless receiving coil 112 for charging, the first control unit 183 is also used to control the smart watch 100 to output a first switching instruction, so that the wireless charger 200 provides a first wireless charging input to charge the smart watch 100; the first wireless receiving coil 112 is used to receive the first wireless charging input and generate an alternating current. Since the loop between the first wireless receiving coil 112 and the first wireless charging unit 184 is connected, the alternating current generated by the first wireless receiving coil 112 is provided to the first wireless charging unit 184 to wirelessly charge the battery 115 .

[0162] For example, at the beginning of charging, the first control unit 183 is used to control the first switching unit 185 to conduct the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184, and disconnect the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184, so that the smart watch 100 is charged by the first wireless receiving coil 112. As the first wireless receiving coil 112 is charged, the first charging temperature gradually rises. If the first charging temperature is greater than or equal to the first preset threshold, the first control unit 183 is used to control the first switching unit 185 to conduct the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184, and disconnect the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184, so as to switch the second wireless receiving coil 117 to charge. As the second wireless receiving coil 117 is charged, the first charging temperature gradually decreases and the second charging temperature gradually increases. If the second charging temperature is greater than or equal to the second preset threshold, the first control unit 183 is used to control the first switching unit 185 to turn on the circuit between the first wireless receiving coil 112 and the first wireless charging unit 184, and disconnect the circuit between the second wireless receiving coil 117 and the first wireless charging unit 184, so as to switch the first wireless receiving coil 112 to charge again. Similarly, the first wireless receiving coil 112 and the second wireless receiving coil 117 are charged alternately with each other until the smart watch 100 is fully charged.

[0163] It should be noted that, in the above-mentioned alternate charging scheme at the receiving end, the charging power of the first wireless receiving coil 112 and the charging power of the second wireless receiving coil 117 may be the same or different.

[0164] For example, please refer to Fig. 9 , Fig. 9 The change of charging power corresponding to the alternate charging scheme of the receiving end provided in the embodiment of the present application Figure 1 .

[0165] Among them, from time 0 to time T11, the second wireless receiving coil 117 is charged; at time T11, the second charging temperature is greater than or equal to the second preset threshold, and the first wireless receiving coil 112 is switched to charge; from time T11 to time T12, the first wireless receiving coil 112 is charged; at time T12, the first charging temperature is greater than or equal to the first preset threshold, and the second wireless receiving coil 117 is switched to charge; from time T12 to time T13, the second wireless receiving coil 117 is charged; at time T13, the second charging temperature is greater than or equal to the second preset threshold, and the first wireless receiving coil 112 is switched to charge; from time T13 to time T14, the first wireless receiving coil 112 is charged. The receiving coil 112 is charged; at time T14, the first charging temperature is greater than or equal to the first preset threshold, and the second wireless receiving coil 117 is switched to charge; from time T14 to time T15, the second wireless receiving coil 117 is charged; at time T15, the second charging temperature is greater than or equal to the second preset threshold, and the first wireless receiving coil 112 is switched to charge; from time T15 to time T16, the first wireless receiving coil 112 is charged; at time T16, the first charging temperature is greater than or equal to the first preset threshold, and the second wireless receiving coil 117 is switched to charge; from time T16 to time T17, the second wireless receiving coil 117 is charged; charging ends at time T17.

[0166] Fig. 9 In the embodiment, the charging power of the first wireless receiving coil 112 and the charging power of the second wireless receiving coil 117 are the same, both of which are W1. Therefore, as the first wireless receiving coil 112 and the second wireless receiving coil 117 are charged alternately, Fig. 9 The charging power in the circuit is distributed in a straight line.

[0167] For example, please refer to Fig.10 , Fig.10 The change of charging power corresponding to the alternate charging scheme of the receiving end provided in the embodiment of the present application Figure 2 .

[0168] Among them, from time 0 to time T21, the second wireless receiving coil 117 is charged; at time T21, the second charging temperature is greater than or equal to the second preset threshold, and the first wireless receiving coil 112 is switched to charge; from time T21 to time T22, the first wireless receiving coil 112 is charged; at time T22, the first charging temperature is greater than or equal to the first preset threshold, and the second wireless receiving coil 117 is switched to charge; from time T22 to time T23, the second wireless receiving coil 117 is charged; at time T23, the second charging temperature is greater than or equal to the second preset threshold, and the first wireless receiving coil 112 is switched to charge; from time T23 to time T24, the first wireless receiving coil 112 is charged. The receiving coil 112 is charged; at time T24, the first charging temperature is greater than or equal to the first preset threshold, and the second wireless receiving coil 117 is switched to charge; from time T24 to time T25, the second wireless receiving coil 117 is charged; at time T25, the second charging temperature is greater than or equal to the second preset threshold, and the first wireless receiving coil 112 is switched to charge; from time T25 to time T26, the first wireless receiving coil 112 is charged; at time T26, the first charging temperature is greater than or equal to the first preset threshold, and the second wireless receiving coil 117 is switched to charge; from time T26 to time T27, the second wireless receiving coil 117 is charged; charging ends at time T27.

[0169] Fig.10 In the example, the charging power of the first wireless receiving coil 112 is different from the charging power of the second wireless receiving coil 117. Among them, W1 is the charging power of the second wireless receiving coil 117, and W2 is the charging power of the first wireless receiving coil 112. Therefore, as the first wireless receiving coil 112 and the second wireless receiving coil 117 are charged alternately, Fig.10 The charging power in the battery is distributed alternately between high and low.

[0170] In the single-coil charging solution of the conventional technology, there is only the second wireless receiving coil 117, that is, the second wireless receiving coil 117. For the solution with only a single coil, the charging strategy is: when the temperature of the second wireless receiving coil 117 reaches the threshold, the charging power of the second wireless receiving coil 117 is usually reduced to 0 (that is, charging is stopped) to allow the temperature of the second wireless receiving coil 117 to drop. As the heat dissipation proceeds, the temperature of the second wireless receiving coil 117 gradually drops. When the temperature of the second wireless receiving coil 117 drops, the charging power is increased again, and this is repeated.

[0171] For example, please refer to Fig.11 and Fig.12 , Fig.11 This is the charging power change diagram corresponding to the single-coil charging solution. Fig.12 This is the temperature variation diagram corresponding to the single-coil charging scheme.

[0172] Fig.11In the embodiment, from time 0 to time T31, the second wireless receiving coil 117 is charged, and the charging power is W1; from time T31 to time T32, the second wireless receiving coil 117 stops charging, and the charging power is zero; from time T32 to time T33, the second wireless receiving coil 117 is charged, and the charging power is W1; from time T33 to time T34, the second wireless receiving coil 117 stops charging, and the charging power is zero; from time T34 to time T35, the second wireless receiving coil 117 is charged, and the charging power is W1; from time T35 to time T36, the second wireless receiving coil 117 stops charging, and the charging power is zero; from time T36 to time T37, the second wireless receiving coil 117 is charged, and the charging power is W1; and charging ends at time T37. Fig.11 In the example, since only one coil is charged, as the second wireless receiving coil 117 is charged and stopped, Fig.11 The charging power in the system is distributed alternately high and low. Fig.12 The temperature of the second wireless receiving coil 117 is also alternately high and low as the second wireless receiving coil 117 is charged and stopped.

[0173] By comparison, we can find that Fig.11 There is a period of time during the entire charging process when charging is stopped, that is, there is a period of time when the charging power is zero; Fig. 9 and Fig.10 There is no period of time during the entire charging process when charging is stopped, that is, there is no period of time when the charging function is zero.

[0174] Fig.11 , the charging power of the second wireless receiving coil 117 during the charging period, and Fig. 9 , Fig.10 The charging power of the second wireless receiving coil 117 during the charging period is the same, which is W1. Fig.11 During the time period when the second wireless receiving coil 117 stops charging, the charging power is zero, which makes Fig.11 In the single-coil charging scheme shown, the average charging power of the entire charging process decreases, thereby prolonging the charging time; Fig. 9 and Fig.10 During the time period when the second wireless receiving coil 117 stops charging, the first wireless receiving coil 112 provides charging powers W1 and W2 that are greater than zero, which makes Fig. 9 and Fig.10 In the alternate charging scheme at the receiving end shown, the average charging power of the entire charging process is increased, thereby shortening the charging time. This embodiment achieves the purpose of shortening the charging time by increasing the charging power.

[0175] It should be noted that, in other embodiments, Fig.11The charging power during the charging period of the second wireless receiving coil 117 may also be Fig. 9 , Fig.10 The charging power of the first wireless receiving coil 112 in the charging time period is different. For example, within the allowable range, Fig.11 During the charging period of the second wireless receiving coil 117, the charging power is increased, or Fig. 9 The charging power of the first wireless receiving coil 112 and / or the second wireless receiving coil 117 in the respective charging time periods is reduced to make Fig.11 The single coil charging scheme shown and Fig. 9 , Fig.10 The receiver alternating charging scheme shown has the same average charging power throughout the charging process. In this case, Fig. 9 and Fig.10 The equivalent of using two coils to generate the required average charging power is Fig.11 In terms of charging power, it is equivalent to changing the heat source from one location to two locations, which is beneficial to increase the heat dissipation space and disperse the heat, thereby improving the situation where the charging temperature rises significantly. And, under the same average charging power, Fig. 9 and Fig.10 The charging power of a single coil is lower, and the temperature of the space where the first wireless receiving coil 112 and the temperature of the space where the second wireless receiving coil 117 are located are reduced, which is beneficial to reducing the situation where the smart watch 100 becomes noticeably hot during charging.

[0176] It should be noted that the above Fig. 9 , Fig.10 , Fig.11 In the embodiment, the charging power of each wireless receiving coil during charging is a constant value. In other embodiments, it may also be a value that changes with temperature.

[0177] Please continue to refer to Figure 8 In other embodiments, the first switching unit 185 may use two multi-pole multi-throw switches (such as double-pole double-throw switches). The first control unit 183 may also be used to control the first switching unit 185 to conduct the circuit between one of the first wireless receiving coil 112 and the second wireless receiving coil 117 and the first wireless charging unit 184, so that the smart watch 100 uses one of the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge the battery 115. Based on this, the above-mentioned receiving end alternating charging scheme can be applicable to the embodiment in which the first switching unit 185 can use two multi-pole multi-throw switches.

[0178] It should be noted that it is easy for those skilled in the art to implement two multi-pole multi-throw switches to connect the circuit between one of the first wireless receiving coil 112 and the second wireless receiving coil 117 and the first wireless charging unit 184, and no further details will be given here.

[0179] Please refer to Fig.13 , Fig.13 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application.

[0180] The receiving end RX of the wireless charging system is Figure 5 The smart watch 100 shown is different from Figure 8 The receiving end RX includes two first wireless charging units 184 .

[0181] An input end of one of the first wireless charging units 184 is coupled to the first wireless receiving coil 112, and an output end is coupled to the battery 115, so as to convert the AC current generated by the first wireless receiving coil 112 into a DC current suitable for charging the battery 115 to charge the battery 115; an input end of the other first wireless charging unit 184 is coupled to the second LC resonant circuit 182, and an output end is coupled to the battery 115, so as to convert the AC current generated by the second wireless receiving coil 117 into a DC current suitable for charging the battery 115 to charge the battery 115.

[0182] Fig.13 In the embodiment shown, a separate first wireless charging unit 184 is configured for each wireless receiving coil in the receiving end RX, and a first wireless charging unit 184 is no longer shared. In this case, there is no need to set up an additional wireless charging unit 184 for multiplexing. Figure 8 The first switching unit 185 shown is switched. It should be noted that the above content focuses on Figure 8 and Fig.13 Different units are introduced. Fig.13 Units not mentioned in the above may be adapted for reference Figure 8 See the relevant instructions in .

[0183] based on Fig.13 In the circuit scheme of the receiving end RX shown in the figure, in other embodiments of the present application, the smart watch 100 can be charged by the first wireless receiving coil 112 and the second wireless receiving coil 117. When two wireless receiving coils are used to wirelessly charge the battery 115, the charging temperatures of the two wireless receiving coils are independently controlled, which is referred to as a receiving end independent control charging scheme in the embodiment of the present application.

[0184] Specifically, when the first charging temperature is less than the first preset threshold, the smart watch 100 can be used to send a first charging instruction to the wireless charger 200, the first charging instruction is used to instruct the wireless charger 200 to control the wireless transmitting coil corresponding to the first wireless receiving coil 112 to provide a first wireless charging input, and the first charging instruction is also used to indicate the desired charging power of the first wireless charging input, such as the first power. In this case, the smart watch 100 uses the first wireless receiving coil 112 to receive the first wireless charging input to charge the battery 115. When the second charging temperature is less than the second preset threshold, the smart watch 100 can be used to send a second charging instruction to the wireless charger 200, the second charging instruction is used to instruct the wireless charger 200 to control the wireless transmitting coil corresponding to the second wireless receiving coil 117 to provide a second wireless charging input, and the second charging instruction is also used to indicate the desired charging power of the second wireless charging input, such as the second power. In this case, the smart watch 100 uses the second wireless receiving coil 117 to receive the second wireless charging input to charge the battery 115. It should be understood that at a certain moment, if the first charging temperature is less than the first preset threshold and the second charging temperature is less than the second preset threshold, the first control unit 183 can be used to send the first charging instruction and the second charging instruction to the wireless charger 200. The first wireless receiving coil 112 receives the first wireless charging input to charge the battery 115, and the second wireless receiving coil 117 receives the second wireless charging input to charge the battery 115. In this case, the smart watch 100 uses the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge.

[0185] In the case where the first wireless receiving coil 112 and the second wireless receiving coil 117 are used to charge the battery 115 together, if the charging temperature of any one of the first wireless receiving coil 112 and the second wireless receiving coil 117 does not meet the requirements, the smart watch 100 is used to output a second control instruction to the wireless charger 200 that powers the smart watch 100, and the second control instruction is used to instruct the wireless charger 200 to reduce the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils. It should be understood that as the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils is reduced, the charging power of any one of the wireless receiving coils is also reduced. For the sake of distinction, the second control instruction for instructing the wireless charger 200 to reduce the charging power of the wireless transmitting coil corresponding to the first wireless receiving coil 112 will be referred to as the third charging instruction, and the second control instruction for instructing the wireless charger 200 to reduce the charging power of the wireless transmitting coil corresponding to the second wireless receiving coil 117 will be referred to as the fourth charging instruction.

[0186] That is, when the first wireless receiving coil 112 and the second wireless receiving coil 117 are used to charge the battery 115 together, if the first charging temperature is greater than or equal to the first preset threshold, the smart watch 100 is used to output a third charging instruction to the wireless charger 200, and the third charging instruction is used to instruct the wireless charger 200 to reduce the charging power of the wireless transmitting coil (i.e., the first wireless transmitting coil 220 shown in the figure) corresponding to the first wireless receiving coil 112; as the charging power of the first wireless transmitting coil 220 is reduced, the charging power of the first wireless receiving coil 112 is reduced to ensure charging safety. For example, the third charging instruction is used to instruct the wireless charger 200 to control the wireless transmitting coil corresponding to the first wireless receiving coil 112 to provide a first wireless charging input with a third power, wherein the third power is less than the first power, such as the third power is zero (in this case, the third charging instruction is used to instruct the wireless charger 200 to control the first wireless receiving coil 112 to stop providing the first wireless charging input). In this case, the smart watch 100 uses the first wireless receiving coil 112 to receive the first wireless charging input with the third power for charging, and the charging power of the first wireless receiving coil 112 can be reduced.

[0187] In the case where the first wireless receiving coil 112 and the second wireless receiving coil 117 are used to charge the battery 115 together, if the second charging temperature is greater than or equal to the second preset threshold, the smart watch 100 is used to output a fourth charging instruction to the wireless charger 200, and the fourth charging instruction is used to instruct the wireless charger 200 to reduce the charging power of the wireless transmitting coil (i.e., the second wireless transmitting coil 230 shown in the figure) corresponding to the second wireless receiving coil 117. As the charging power of the second wireless transmitting coil 230 decreases, the charging power of the second wireless receiving coil 117 decreases to ensure charging safety. For example, the fourth charging instruction is used to instruct the wireless charger 200 to control the wireless transmitting coil corresponding to the second wireless receiving coil 117 to provide a second wireless charging input with a fourth power, wherein the fourth power is less than the second power, such as the fourth power is zero (in this case, the fourth charging instruction is used to instruct the wireless charger 200 to control the second wireless receiving coil 117 to stop providing the second wireless charging input). In this case, the smart watch 100 uses the second wireless receiving coil 117 to receive the second wireless charging input with the fourth power for charging, and the charging power of the second wireless receiving coil 117 can be reduced.

[0188] Please continue to refer to Fig.13 The first control unit 183 can be used to control the impedance of the circuit to achieve the output of the first charging instruction, the second charging instruction, the third charging instruction and the fourth charging instruction. For example, it controls the connection or disconnection of the capacitor C1 and / or the capacitor C2 and the impedance of the capacitor C1 and the capacitor C2 when connected.

[0189] For example, at the beginning of charging, the first charging temperature is less than the first preset threshold, and the second charging temperature is less than the second preset threshold. The first control unit 183 is used to control the output of the first charging instruction and the second charging instruction so that the smart watch 100 uses the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge. As the first wireless receiving coil 112 and the second wireless receiving coil 117 are charged, the first charging temperature and the second charging temperature gradually rise. Assuming that the first charging temperature does not meet the requirements first, that is, the first charging temperature is greater than or equal to the first preset threshold, the first control unit 183 is used to control the output of the third charging instruction to reduce the charging power of the first wireless receiving coil 112. As the charging power of the first wireless receiving coil 112 decreases, the first charging temperature gradually decreases. If the first charging temperature is less than the third preset threshold (which can be set as needed), the first control unit 183 can be used to output the first charging instruction so that the smart watch 100 increases the charging power of the first wireless receiving coil 112. The temperature control of the charging process of the second wireless receiving coil 117 is similar and will not be repeated.

[0190] The following takes the case where the charging power drops to zero as an example. In other embodiments, the charging power may also drop to a value greater than zero. It should be understood that when the charging power drops, if the heat dissipation rate is higher than the rate at which the temperature rises due to charging, it may also have the effect of cooling the coil. This will not be described in detail here. It should be noted that in the above-mentioned receiving-end independent control charging scheme, the charging power of the first wireless receiving coil 112 and the charging power of the second wireless receiving coil 117 may be the same or different.

[0191] For example, please refer to Fig.14 , Fig.14 This is a diagram showing the changes in charging power and temperature of the first wireless receiving coil in the receiving-end independent charging solution provided in an embodiment of the present application.

[0192] Fig.14(a) in the figure shows the charging power variation trend of the first wireless receiving coil 112. Charging starts at time 0, and the first charging temperature rises. When the first charging temperature reaches time T41, it is too high, and the first wireless receiving coil 112 stops charging to cool down the first wireless receiving coil 112. As the cooling and heat dissipation proceed, the first charging temperature drops. When the first charging temperature reaches time T42, it is normal, and the first wireless receiving coil 112 charges. As the charging proceeds, the first charging temperature rises. When the first charging temperature reaches time T43, it is too high, and the first wireless receiving coil 112 stops charging to cool down the first wireless receiving coil 112. This is repeated until T45, when charging ends. That is, from time 0 to time T41, the first wireless receiving coil 112 is charged; from time T41 to time T42, the first wireless receiving coil 112 stops charging; from time T42 to time T43, the first wireless receiving coil 112 is charged; from time T43 to time T44, the first wireless receiving coil 112 stops charging; from time T44 to time T45, the first wireless receiving coil 112 is charged; and charging ends at time T45. Among them, W1 is the charging power of the first wireless receiving coil 112. Fig.14 (b) in the figure illustrates the temperature variation trend of the first wireless receiving coil 112. In the figure, the temperature of the first wireless receiving coil 112 gradually rises to the first preset threshold value as the first wireless receiving coil 112 is charged, and drops to the third preset threshold value as the first wireless receiving coil 112 stops charging. The temperature of the first wireless receiving coil 112 is alternately high and low as the first wireless receiving coil 112 is repeatedly charged and stopped.

[0193] For example, please refer to Fig.15 , Fig.15 This is a diagram showing the changes in charging power and temperature of the second wireless receiving coil in the receiving-end independent charging solution provided in an embodiment of the present application.

[0194] Fig.15(a) in the figure shows the charging power variation trend of the second wireless receiving coil 117. Charging starts at time 0, and the second charging temperature rises. When the second charging temperature reaches time T51, it is too high, and the second wireless receiving coil 117 stops charging to cool down the first wireless receiving coil 112. As the cooling and heat dissipation proceed, the first charging temperature drops. When the first charging temperature reaches time T52, it is normal, and the second wireless receiving coil 117 charges. As the charging proceeds, the first charging temperature rises. When the first charging temperature reaches time T53, it is too high, and the second wireless receiving coil 117 stops charging to cool down the second wireless receiving coil 117. This is repeated until T55, when charging ends. That is, from time 0 to time T51, the second wireless receiving coil 117 is charged; from time T51 to time T52, the second wireless receiving coil 117 stops charging; from time T52 to time T53, the second wireless receiving coil 117 is charged; from time T53 to time T54, the second wireless receiving coil 117 stops charging; from time T54 to time T55, the first wireless receiving coil 112 is charged; and charging ends at time T55. Among them, W2 is the charging power of the second wireless receiving coil 117.

[0195] Fig.15 (b) in the figure illustrates the temperature variation trend of the second wireless receiving coil 117. In the figure, the temperature of the second wireless receiving coil 117 gradually rises to the second preset threshold value as the second wireless receiving coil 117 is charged, and drops to the fourth preset threshold value as the second wireless receiving coil 117 stops charging, and alternately shows high and low distribution as the second wireless receiving coil 117 repeatedly charges and stops charging.

[0196] By comparison Fig.14 (a) and Fig.15 In (a), the charging time periods of the first wireless receiving coil 112 and the second wireless receiving coil 117 overlap, that is, when charging using the above temperature control strategy, the first wireless receiving coil 112 and the second wireless receiving coil 117 are charged at the same time.

[0197] It should be understood that in the receiving end independent control charging solution, the average charging power of the smart watch 100 is Fig.14 The charging power of the first wireless receiving coil 112 in (a) and Fig.15 The charging power of the second wireless receiving coil 117 in (a) is determined by two parts. Fig.11 In the single-coil charging scheme of FIG. 1 , only the second wireless receiving coil 117 is used for charging, and the average charging power of the smart watch 100 is only Fig.11 The charging power of the second wireless receiving coil 117 is determined by the charging power of the second wireless receiving coil 117.

[0198] By comparison, we can find that Fig.15The charging power of the second wireless receiving coil 117 in (a) and Fig.11 The charging power of the second wireless receiving coil 117 is the same, which is W2. In this case, compared with Fig.11 In the receiving end independent control charging solution, the first wireless receiving coil 112 and the second wireless receiving coil 117 are used to charge the battery 115 at the same time, which can provide additional benefits. Fig.14 The charging power provided by the first wireless receiving coil 112 in (a) above increases the average charging power of the entire charging process of the receiving end independent charging scheme and shortens the charging time. Fig.14 In (a), the charging power W1 of the first wireless receiving coil 112 is equal to W2, and the average charging power can be provided as Fig.11 This embodiment achieves the purpose of shortening the charging time by increasing the charging power.

[0199] It should be understood that although Fig.15 (a) and Fig.11 The charging power of the second wireless receiving coil 117 is the same, but Fig.15 The charging power of the second wireless receiving coil 117 in (a) and Fig.11 The charging power of the second wireless receiving coil 117 may also be different. Fig.14 The charging power of the first wireless receiving coil 112 in (a) and Fig.15 The charging powers of the second wireless receiving coils 117 in (a) may also be the same or different. For example, when the heat dissipation conditions of the coils are the same, the charging powers may be the same; when the heat dissipation conditions of the coils are different, the charging powers may be different.

[0200] when Fig.14 The charging power of the first wireless receiving coil 112 in (a) and Fig.15 The charging power of the second wireless receiving coil 117 in (a) makes the average charging power of the entire charging process of the receiving end independent control charging scheme, and Fig.11 When the average charging power of the single-coil charging scheme shown is the same, since the two coils in the receiving-end independent charging scheme are dispersed, the heat dissipation is faster and the temperature is lower, which can reduce the heating of the smart watch 100.

[0201] It should be noted that the above Fig.11 , Fig.14 , Fig.15 In the embodiment, the charging power of each wireless receiving coil during charging is a constant value. In other embodiments, it may also be a value that changes with temperature.

[0202] In addition, please continue to refer to Fig.13 , Fig.13 In the circuit scheme shown, one of the two wireless receiving coils can also be selected to charge the battery 115. For example, when the first wireless receiving coil 112 is needed for charging, the first control unit 183 can be used to control the output of the first charging instruction so that the wireless charger 200 provides a first wireless charging input with a first power. In this case, the smart watch 100 uses the first wireless receiving coil 112 to receive the first wireless charging input to wirelessly charge the battery 115. For another example, when the second wireless receiving coil 117 is needed for charging, the first control unit 183 can be used to control the output of the second charging instruction so that the wireless charger 200 provides a second wireless charging input with a second power. In this case, the smart watch 100 uses the second wireless receiving coil 117 to receive the second wireless charging input to wirelessly charge the battery 115. Based on this, the above-mentioned receiving end alternating charging scheme can also be applied to Fig.13 The circuit scheme of the receiving end RX is shown.

[0203] In addition, it should be noted that Figure 8 In the case where the first switching unit 185 adopts two multi-pole multi-throw switches, the first control unit 183 can also be used to control the input end of the first switching unit 185 to connect with the first wireless receiving coil 112 and the second wireless receiving coil 117, so as to conduct the circuit between the first wireless receiving coil 112 and the second wireless receiving coil 117 and the first wireless charging unit 184, so that the smart watch 100 uses the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge the battery 115 together. The receiving end independent control charging solution is also applicable to Figure 8 The first switching unit 185 uses two multi-pole multi-throw switches. It should be noted that it is easy for those skilled in the art to realize the conduction of the circuit between the two wireless receiving coils in the first wireless receiving coil 112 and the second wireless receiving coil 117 and the first wireless charging unit 184 using two multi-pole multi-throw switches, and no further details will be given here.

[0204] For example, please refer to Fig.16 , Fig.16 A circuit schematic diagram of a smart watch provided in an embodiment of the present application.

[0205] The smart watch 100 may also include a first circuit unit, a second circuit unit, and a wireless charging unit. The first wireless receiving coil 112 is connected to the wireless charging unit via the first circuit unit, and the second wireless receiving coil 117 is connected to the wireless charging unit via the second circuit unit. The first wireless receiving coil 112 and the second wireless receiving coil 117 are connected to the wireless charging unit in parallel.

[0206] Among them, the first circuit unit can be understood as a device for tuning the resonant frequency of the first wireless receiving coil 112, and the second circuit unit can be understood as a device for tuning the resonant frequency of the second wireless receiving coil 117. Exemplarily, the first circuit unit and the second circuit unit can be capacitors, etc. The first circuit unit and the second circuit unit achieve the purpose of tuning the resonant frequency by adjusting the impedance of the circuit in which they are located, thereby improving the charging efficiency. The commonly used resonant frequency is 130kHz. Based on this, the first circuit unit and the second circuit unit can adjust the resonant frequencies of the first wireless receiving coil 112 and the second wireless receiving coil 117 to 130kHz respectively.

[0207] Among them, the wireless charging unit is a component that uses the alternating current generated by the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge the battery. In this case, the first wireless receiving coil 112 and the second wireless receiving coil 117 can pick up charging power respectively. For example, when the first wireless receiving coil 112 and the second wireless receiving coil 117 both pick up power, the charging power of the first wireless receiving coil 112 is Pa, and the charging power of the second wireless receiving coil 117 is Pb. Then, the charging power of the smart watch 100, that is, the total charging power is Pdis, then, Pdis = Pa + Pb. Among them, Pa and Pb can be the same or different. For example, when the smart watch 100 is required to provide a charging power of 10W (watts), the first wireless receiving coil 112 and the second wireless receiving coil 117 can provide 5W and 5W respectively, or 3W and 7W, and so on.

[0208] In this case, compared with the smart watch with a single-coil charging solution, at the same charging power, Fig.17 The smartwatch 100 shown shares the same charging power through two wireless receiving coils, so each wireless receiving coil needs to bear less power and lower temperature. Fig.17 The two wireless receiving coils of the smart watch 100 shown can both be charged at a charging power close to the limit of the same charging temperature requirement. When the charging power of one of the wireless receiving coils is exactly the same as the charging power of a single wireless receiving coil in the single-coil charging scheme, the smart watch 100 can additionally benefit from the charging power of the other wireless receiving coil.

[0209] For details, please refer to Fig.17 , Fig.17 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application.

[0210] Fig.17 The receiving end RX shown can be understood as Fig.16The smart watch 100 shown includes a first LC resonance circuit 181 , a second LC resonance circuit 182 , a first control unit 183 , a first wireless charging unit 184 and a battery 115 .

[0211] Different from Figure 8 , Fig.17 In the receiving end RX shown in the figure, the first wireless receiving coil 112 and the second wireless receiving coil 117 are directly coupled to the input end of the first wireless charging unit 184, and no more Figure 8 In this case, the first wireless receiving coil 112 and the second wireless receiving coil 117 also share the first wireless charging unit 184, which is beneficial to reducing costs and miniaturizing the smart watch 100. Figure 8 and Fig.17 Different units are introduced. Fig.17 Units not mentioned in the above may be adapted for reference Figure 8 See the relevant instructions in .

[0212] Specifically, the input end of the first wireless charging unit 184 includes a first input end (i.e., the first input end of the rectifier bridge) and (i.e., the second input end of the rectifier bridge). The first ends of the first wireless receiving coil 112 and the second wireless receiving coil 117 are both coupled to the first input end of the first wireless charging unit 184, and the second ends of the first wireless receiving coil 112 and the second wireless receiving coil 117 are both coupled to the second input end of the first wireless charging unit 184. In this way, the first wireless receiving coil 112 and the second wireless receiving coil 117 are connected to the first wireless charging unit 184 in parallel.

[0213] In this case, the alternating current generated by electromagnetic induction between the first wireless receiving coil 112 and the first wireless transmitting coil 220 will be supplied to the first wireless charging unit 184, and the alternating current generated by electromagnetic induction between the second wireless receiving coil 117 and the second wireless transmitting coil 230 will also be supplied to the first wireless charging unit 184. The alternating currents generated by the two will be superimposed due to the parallel connection. The first wireless charging unit 184 is used to convert the superimposed alternating current into a direct current suitable for charging the battery 115 and then charge the battery 115, thereby charging the battery 115.

[0214] It should be understood that, when the input voltage Vin is kept constant and the charging power of the first wireless receiving coil 112 and the second wireless receiving coil 117 is kept constant, Fig.17The parallel scheme shown can increase the current on the rear-stage trunk (as shown by the position of point X in the figure), thereby increasing the charging power of the wireless charger 200 and the smart watch 100. Assuming that the charging power of the first wireless receiving coil 112 and the second wireless receiving coil 117 are the same, the charging power of the smart watch 100 can be doubled. The parallel scheme achieves the improvement of charging power by increasing the current. It should be noted that in some scenarios, the voltage that the first wireless charging unit 184 can receive is relatively low (such as the requirements of the protocols of each chip and device). In this case, the charging power of the smart watch 100 can be increased by increasing the current through this parallel scheme.

[0215] based on Fig.17 In the parallel circuit scheme of the receiving end RX shown in the figure, the first control unit 183 can be used to control the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge the battery 115 together. Specifically, when the first charging temperature and the second charging temperature both meet the requirements, the first control unit 183 is used to control the output of the fifth charging instruction, and the fifth charging instruction is used to instruct the wireless charger 200 to provide the first wireless charging input and the second wireless charging input. In this case, the first wireless receiving coil 112 and the second wireless receiving coil 117 can both undergo electromagnetic induction to generate an alternating current, so that the battery 115 can be charged together. When either the first charging temperature or the second charging temperature does not meet the requirements, the first control unit 183 is used to control the output of the sixth charging instruction, and the sixth charging instruction is used to instruct the wireless charger 200 to reduce the charging power of the wireless transmitting coil corresponding to the wireless receiving coil whose charging temperature does not meet the requirements. For example, if the first charging temperature does not meet the requirements, the sixth charging instruction is used to instruct the wireless charger 200 to provide a first wireless charging input with a third power to reduce the charging power of the wireless transmitting coil corresponding to the first wireless receiving coil 112 (i.e., the first wireless transmitting coil 220 shown in the figure), such as the instruction for instructing the wireless charger 200 to stop providing the first wireless charging input, that is, the third power is zero; for another example, if the second charging temperature does not meet the requirements, the sixth charging instruction is used to instruct the wireless charger 200 to provide a second wireless charging input with a fourth power to reduce the charging power of the wireless transmitting coil corresponding to the second wireless receiving coil 117 (i.e., the second wireless transmitting coil 230 shown in the figure), such as the instruction for instructing the wireless charger 200 to stop providing the second wireless charging input, that is, the fourth power is zero. In this way, as the charging power of the wireless transmitting coil corresponding to the wireless receiving coil whose charging temperature does not meet the requirements is reduced, the charging power of the wireless receiving coil whose charging temperature does not meet the requirements is also reduced, thereby ensuring charging safety.

[0216] Different from Fig.13 , Fig.17In the wireless charger 200, due to the parallel connection, there is only one wireless charging unit (i.e., the second wireless charging unit 244 shown in the figure). Once the input voltage Vin and / or the PWM square wave are adjusted, the charging power of the two wireless transmitting coils will be adjusted, thereby adjusting the charging power of the two wireless receiving coils together. The charging power of one wireless receiving coil cannot be controlled separately. Once the charging power of one wireless receiving coil is reduced, the charging power of the other wireless receiving coil will also be reduced. If one wireless receiving coil stops charging, the other wireless receiving coil will also stop charging. Fig.13 In the embodiment, the first control unit 183 can individually control the charging power of any wireless receiving coil to be reduced. Fig.17 The illustrated solution may be applicable to a scenario where the charging temperature changes of the first wireless receiving coil 112 and the second wireless receiving coil 117 are substantially the same.

[0217] Of course, in other embodiments, switches may be added to the branches where the first wireless receiving coil 112 and the second wireless receiving coil 117 are located, and / or to the branches where the wireless transmitting coils corresponding to the first wireless receiving coil 112 and the second wireless receiving coil 117 are located, so that the first wireless receiving coil 112 and the second wireless receiving coil 117 can be independently controlled. Figure 8 In the embodiment, the first switching unit 185 is implemented by two multi-pole multi-throw switches. Fig.13 The receiving-end independent control charging scheme shown can be applied to this scheme.

[0218] Understandably, Fig.16 and Fig.17 In the circuit shown, when the first wireless receiving coil 112 and the second wireless receiving coil 117 are connected in series to the wireless charging unit, the first wireless receiving coil 112 and the second wireless receiving coil 117 can also pick up the charging power respectively. Then, the charging power of the smart watch 100 is the total charging power Pdis=Pa+Pb.

[0219] For example, please refer to Fig.18 , Fig.18 A circuit schematic diagram of another wireless charging system provided in an embodiment of the present application.

[0220] Different from Fig.17 In the receiving end RX of the wireless charging system, the first wireless receiving coil 112 and the second wireless receiving coil 117 are connected in series to the input end of the first wireless charging unit 184. In this case, the first wireless receiving coil 112 and the second wireless receiving coil 117 also share the first wireless charging unit 184, which is conducive to reducing costs and miniaturizing the smart watch 100. It should be noted that the following Fig.17 and Fig.18 Different units are introduced. Fig.18 Units not mentioned in the above may be adapted for reference Fig.17 See the relevant instructions in .

[0221] Specifically, the input end of the first wireless charging unit 184 includes a first input end (i.e., the first input end of the rectifier bridge) and (i.e., the second input end of the rectifier bridge). Among them, the first end of the first wireless receiving coil 112 is coupled to the first input end of the first wireless charging unit 184, the second end of the first wireless receiving coil 112 is coupled to the first end of the second wireless receiving coil 117, and the second end of the second wireless receiving coil 117 is coupled to the second input end of the first wireless charging unit 184. In this way, the first wireless receiving coil 112 and the second wireless receiving coil 117 are connected in series to the first wireless charging unit 184. In this case, the AC voltage at both ends of the first wireless receiving coil 112 and the AC voltage at both ends of the second wireless receiving coil 117 will be superimposed due to the series connection.

[0222] It should be noted that the first wireless receiving coil 112 and the second wireless receiving coil 117 are connected in series, the current in the circuit remains unchanged, but the voltage is increased. When the charging power of the first wireless receiving coil 112 and the second wireless receiving coil 117 remains unchanged, Fig.18 The series connection scheme shown in the figure can increase the voltage at the position shown by point M and point N in the figure, thereby increasing the charging power of the wireless charger 200 and the smart watch 100. Assuming that the charging power of the first wireless receiving coil 112 and the second wireless receiving coil 117 is the same, the charging power of the smart watch 100 can be doubled. Fig.17 The parallel scheme, Fig.18 The series connection scheme shown achieves an increase in charging power by increasing the voltage.

[0223] It should be noted that in some scenarios, due to high requirements on line loss, the current that can be received by the first wireless charging unit 184 is relatively low. In this case, the charging power of the smart watch 100 can be increased by increasing the voltage through this series connection scheme.

[0224] It should be understood that Figures 5 to 7 The wireless charger used with the smart watch 100 shown in the figure also needs to include two wireless transmitting coils to cooperate with the first wireless receiving coil 112 and the second wireless receiving coil 117 for charging respectively.

[0225] Based on this, the embodiment of the present application also provides a wireless charger suitable for Figures 5 to 7The smart watch 100 shown cooperates to charge the smart watch 100.

[0226] For example, please refer to Fig.19 , Fig.19 A schematic diagram of the structure of a wireless charger provided in an embodiment of the present application.

[0227] The wireless charger 200 includes a first support portion 211 and a second support portion 212. A first wireless transmitting coil 220 is arranged on the first support portion 211, and a second wireless transmitting coil 230 is arranged on the second support portion 212. For example, the first support portion 211 can be constructed as an annular groove structure, and the first wireless transmitting coil 220 is arranged on the first support portion 211 by being embedded in the groove of the first support portion 211. The matching relationship between the second support portion 212 and the second wireless transmitting coil 230 can refer to the specific implementation of the first support portion 211 and the first wireless transmitting coil 220.

[0228] Please refer to Fig. 20 , Fig. 20 for Figure 5 The dial 110 and Fig.19 The wireless charger 200 shown in the figure is in a charging state. Fig. 20 (a)~ Fig. 20 (c) in FIG. 1 shows the wireless charger 200 from different angles.

[0229] Among them, when the dial 110 is located at the charging position of the wireless charger 200, in the charging state, the first support portion 211 is opposite to the display screen 111, and the second support portion 212 is opposite to the back shell 114. In this way, in the charging state, the first wireless transmitting coil 220 arranged on the first support portion 211 is opposite to the first wireless receiving coil 112, and the first wireless charging input can be provided to the first wireless receiving coil 112 to charge the dial 110. The second wireless transmitting coil 230 arranged on the second support portion 212 is arranged opposite to the back shell 114, and the second wireless charging input can be provided to the second wireless receiving coil 117 to charge the dial 110. Of course, in other embodiments, when the second wireless receiving coil 117 is arranged at other positions, the position of the second wireless transmitting coil 230 is also adaptively adjusted.

[0230] It can be seen that the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are distributed at different positions on the wireless charger 200. Like the aforementioned smart watch 100, the two coils are also arranged in a distributed manner. Compared with a wireless charger with a single coil, the wireless charger 200 has a larger heat dissipation space, which can largely solve the heating problem of wireless charging and reduce the impact of heating on the life of the wireless charger. The wireless charger 200 can achieve a lower charging temperature while providing the same charging power; under the same charging temperature requirements, the wireless charger 200 can provide a greater charging power. For details, you can adaptably refer to the description of the aforementioned related embodiments, which will not be repeated here.

[0231] It should be understood that Figure 5 In the embodiment, the display screen 111 is opposite to the rear shell 114. Therefore, in order to make the first support portion 211 opposite to the display screen 111 in the charging state, and the second support portion 212 opposite to the rear shell 114 in the charging state, the first support portion 211 and the second support portion 212 are opposite to each other in the charging state.

[0232] In some embodiments, the first support portion 211 and the second support portion 212 may always be opposite to each other. Naturally, the first support portion 211 and the second support portion 212 may be opposite to each other in a charging state.

[0233] In other embodiments, the positions of the first support portion 211 and the second support portion 212 can also be adjusted. By adjusting the positions of the first support portion 211 and the second support portion 212, they can be relatively close to each other in the charging state. Fig.19 and Fig. 20 The embodiment shown belongs to the latter.

[0234] For details, please refer to Fig.19 or Fig. 20 , the wireless charger 200 further includes a clamping portion 213. The first support portion 211 and the second support portion 212 are connected to the first support portion 211 and the second support portion 212 respectively, and the clamping portion 213 can be used to clamp the dial 110 between the first support portion 211 and the second support portion 212 in the charging state. In this way, the clamping portion 213 can clamp the terminal device between the first support portion 211 and the second support portion 212 in the charging state. On the one hand, the dial 110 is not easy to fall off, and on the other hand, it helps to align the dial 110 and the wireless charger 200 to ensure charging efficiency.

[0235] Optionally, the clamping portion 213 includes a first clamping arm 213 a , a second clamping arm 213 b and a connecting seat 213 c .

[0236] The first support portion 211 is disposed at the first end of the first clamp arm 213a, and the second support portion 212 is disposed at the first end of the second clamp arm 213b. The connection base 213c is rotatably connected (e.g., hinged) to the second end of the first clamp arm 213a and the second end of the second clamp arm 213b, respectively. The connection base 213c can be configured as a cavity structure for accommodating electronic components of the wireless charger 200.

[0237] It should be understood that since the connecting seat 213c is rotatably connected to the second end of the first clamp arm 213a and the second end of the second clamp arm 213b respectively, the first clamp arm 213a and the second clamp arm 213b can both rotate around the connecting seat 213c, thereby driving the first support portion 211 and the second support portion 212 to rotate to achieve "opening" or "closing".

[0238] Please refer to Fig.21 , Fig.21 for Fig.19 The schematic diagram of the wireless charger opening and closing is shown in Figure 1. For easier understanding, Fig.21 A dial 110 is also shown.

[0239] in, Fig.21 Two states of the wireless charger 200, “on” and “off”, are illustrated.

[0240] The "on" state means that the angle between the first support portion 211 and the second support portion 212 of the wireless charger 200 is greater than zero. Figure 5 The dial 110 shown provides convenience for placing in or taking out from the wireless charger 200. Specifically, the maximum angle between the first support portion 211 and the second support portion 212 can be set as needed, and the embodiment of the present application does not limit this.

[0241] The "closed" state means that the angle between the first support portion 211 and the second support portion 212 of the wireless charger 200 is zero. In this case, the first support portion 211 and the second support portion 212 are opposite to each other. Fig.19 In the charging state shown, the dial 110 can be firmly clamped between the first support portion 211 and the second support portion 212 , and the first wireless transmitting coil 220 and the display screen 111 are opposite to each other, and the second wireless transmitting coil 230 and the rear shell 114 are opposite to each other.

[0242] When charging is needed, first, the first support part 211 and / or the second support part 212 are rotated to put the wireless charger 200 in the "on" state, and the dial 110 is placed between the first support part 211 and the second support part 212; then, the first support part 211 and / or the second support part 212 are rotated again to put the wireless charger 200 in the "closed" state, and the dial 110 is firmly clamped between the first support part 211 and the second support part 212 for charging; when charging is completed, first, the first support part 211 and / or the second support part 212 are rotated to put the wireless charger 200 in the "on" state, and the dial 110 is taken out from between the first support part 211 and the second support part 212.

[0243] It should be noted that, in other embodiments, only one of the first clamp arm 213a and the second clamp arm 213b may be rotated around the connecting seat 213c to achieve "opening" or "closing", and the present application embodiment does not specifically limit this. In addition, in other embodiments, the angle between the first support portion 211 and the second support portion 212 may be adjusted in other ways to facilitate the placement and removal of the dial 110.

[0244] In addition, the clamping function of the clamping portion 213 can also be achieved in other ways. Exemplarily, the second end of the first clamping arm 213a and the second end of the second clamping arm 213b are respectively slidably connected to the connecting seat 213c, and the angle between the first clamping arm 213a and the second clamping arm 213b is zero. In this case, the first support portion 211 and the second support portion 212 are always opposite, but the distance between the first support portion 211 and the second support portion 212 can be adjusted by the relative sliding of the first clamping arm 213a and the second clamping arm 213b. When the distance is increased, a function similar to the above-mentioned "open" state can be achieved, which is convenient for placing and taking the dial 110; when the distance is decreased, a function similar to the above-mentioned "closed" state can be achieved, so as to facilitate the clamping function.

[0245] The following is an explanation from the perspective of circuit implementation. Fig.19 The wireless charger 200 is shown for illustration.

[0246] For example, please refer to Figure 8 , Figure 8 The transmitter TX of the wireless charging system shown in the figure may be the wireless charger 200 described above. Figure 8 It can be seen that the wireless charger 200 further includes a second control unit 243 , a second wireless charging unit 244 and a second switching unit 245 .

[0247] The input end of the second wireless charging unit 244 is used to couple with the adapter, the output end of the second wireless charging unit 244 is coupled with the input end of the second switching unit 245, and the output end of the second switching unit 245 is coupled with the first wireless transmitting coil 220 and the second wireless transmitting coil 230 respectively.

[0248] The second control unit 243 is used to perform PWM control on the second wireless charging unit 244, so as to control the second wireless charging unit 244 to convert the DC voltage into the required AC voltage. The so-called PWM control is to pass a PWM square wave. For details, please refer to Figure 1 The second wireless charging unit 244 is used to convert the input voltage Vin provided by the adapter into a desired AC voltage and output it under the control of the second control unit 243. The second control unit 243 is coupled to the first switching unit 185, and is used to control the second switching unit 245 to connect the loop between at least one of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 and the second wireless charging unit 244.

[0249] In some embodiments, the second switching unit 245 can be implemented by two single-pole double-throw switches. In this case, the second switching unit 245 can realize the loop conduction between one of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 and the first wireless charging unit 184.

[0250] For details, please refer to Figure 8 , the second control unit 243 can refer to Figure 1 The transmitter TX shown is understood by MCU11.

[0251] The second wireless charging unit 244 can refer to Figure 1 The power bridge 12 of the transmitter TX is shown as follows. The input end of the power bridge is used as the input end of the second wireless charging unit 244 , and the two output ends of the power bridge are used as the output ends of the second wireless charging unit 244 .

[0252] The second switching unit 245 may include two single-pole double-throw switches, namely a single-pole double-throw switch 2451 and a single-pole double-throw switch 2452 , wherein the third terminals of the single-pole double-throw switch 2451 and the single-pole double-throw switch 2452 are used as input terminals of the second switching unit 245 .

[0253] The first wireless transmitting coil 220 is used as an inductor in the third LC resonant circuit 241, and the second wireless transmitting coil 230 is used as an inductor in the fourth LC resonant circuit 242. The third LC resonant circuit 241 and the fourth LC resonant circuit 242 can refer to Figure 1The LC resonant circuit 21 of the receiving end is shown. Of course, in other embodiments, the specific implementation of each unit may be different, and the embodiment of the present application does not limit this, as long as each unit can perform its corresponding function.

[0254] Among them, the first terminal and the second terminal of the single-pole double-throw switch 2451 are respectively coupled to the first end of the first wireless transmitting coil 220 and the first end of the second wireless transmitting coil 230; the first terminal and the second terminal of the single-pole double-throw switch 2451 are respectively coupled to the second end of the first wireless transmitting coil 220 and the second end of the second wireless transmitting coil 230; the third terminal of the single-pole double-throw switch 2451 and the third terminal of the single-pole double-throw switch 2452 are respectively coupled to the first output end (i.e., the first output end of the power bridge) and the second output end (i.e., the second output end of the power bridge) of the second wireless charging unit 244.

[0255] Among them, when the "pole" of the single-pole double-throw switch 2451 and the single-pole double-throw switch 2452 is placed at the first terminal, the single-pole double-throw switch 2451 and the single-pole double-throw switch 2452 connect the third terminal and the first terminal, and this situation is regarded as the output end of the second switching unit 245 is connected to the first wireless transmitting coil 220; when the "pole" of the single-pole double-throw switch 2451 and the single-pole double-throw switch 2452 is placed at the second terminal, the single-pole double-throw switch 2451 and the single-pole double-throw switch 2452 connect the third terminal and the second terminal, and this situation is regarded as the output end of the second switching unit 245 is connected to the second wireless transmitting coil 230.

[0256] The second control unit 243 can be used to control the single-pole double-throw switch 2451 to connect the third terminal with the first terminal, and control the single-pole double-throw switch 2452 to connect the third terminal with the first terminal, so as to realize the connection of the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244. In this case, the second wireless transmitting coil 230 is disconnected from the second wireless charging unit 244. It can also be used to control the single-pole double-throw switch 2451 to connect the third terminal with the second terminal, and control the single-pole double-throw switch 2452 to connect the third terminal with the second terminal, so as to realize the connection of the circuit between the second wireless transmitting coil 230 and the second wireless charging unit 244. In this case, the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244 is disconnected.

[0257] It should be understood that when the loop between the first wireless transmitting coil 220 and the second wireless charging unit 244 is connected and the loop between the second wireless transmitting coil 230 and the second wireless charging unit 244 is disconnected, the AC voltage output by the second wireless charging unit 244 is supplied to the first wireless transmitting coil 220, and the first wireless transmitting coil 220 generates an AC current, which is output in the form of a magnetic field, thereby providing the above-mentioned first wireless charging input to charge the smart watch 100. When the loop between the second wireless transmitting coil 230 and the second wireless charging unit 244 is connected and the loop between the first wireless transmitting coil 220 and the second wireless charging unit 244 is disconnected, the AC voltage output by the second wireless charging unit 244 is supplied to the second wireless transmitting coil 230, and the second wireless transmitting coil 230 generates an AC current, which is output in the form of a magnetic field, thereby providing the above-mentioned second wireless charging input to charge the smart watch 100. In this embodiment, the first wireless transmitting coil 220 and the second wireless transmitting coil 230 both receive the AC voltage from the second wireless charging unit 244 , thereby sharing the second wireless charging unit 244 , which is beneficial to reducing costs and miniaturizing the wireless charger 200 .

[0258] based on Figure 8 In the circuit scheme of the transmitter TX shown in the figure, the wireless charger 200 can switch between the first wireless transmitting coil 220 and the second wireless transmitting coil 230 as the wireless transmitting coil for charging the smart watch 100, so that the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are charged alternately. This charging scheme is referred to as the transmitter alternating charging scheme in the embodiment of the application. It should be understood that Figure 8 The transmitter TX shown can be used in conjunction with the receiver RX.

[0259] When one of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 charges the smart watch 100, the wireless charger 200 is used to receive a first control instruction from the smart watch 100; the first control instruction is used to instruct the wireless charger 200 to use the other wireless transmitting coil of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 to charge the smart watch 100; in response to the first control instruction, the wireless transmitting coil charging the smart watch 100 is switched from one wireless transmitting coil to another wireless transmitting coil.

[0260] That is, when the wireless charger 200 uses the first wireless transmitting coil 220 to charge the smart watch 100, if the wireless charger 200 receives a first switching instruction from the smart watch 100, the wireless charger 200 is used to switch the second wireless transmitting coil 230 to provide a second wireless charging input in response to the first switching instruction, thereby charging the smart watch 100. When the wireless charger 200 uses the second wireless transmitting coil 230 to charge the smart watch 100, if the wireless charger 200 receives a second switching instruction from the smart watch 100, the wireless charger 200 is used to switch the first wireless transmitting coil 220 to provide a first wireless charging input in response to the second switching instruction, thereby charging the smart watch 100.

[0261] Combination Figure 8 , when the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244 is connected, and the circuit between the second wireless transmitting coil 230 and the second wireless charging unit 244 is disconnected, so that the wireless charger 200 adopts the first wireless transmitting coil 220 for charging, if the wireless charger 200 receives the second switching instruction, the second control unit 243 is used to control the second switching unit 245 to conduct the circuit between the second wireless transmitting coil 230 and the second wireless charging unit 244. In this case, the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244 is disconnected, so that the wireless charger 200 adopts the second wireless transmitting coil 230 for charging, thereby realizing switching the second wireless transmitting coil 230 for charging.

[0262] In the case where the circuit between the second wireless transmitting coil 230 and the second wireless charging unit 244 is connected, and the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244 is disconnected, so that the wireless charger 200 adopts the second wireless transmitting coil 230 for charging, if the wireless charger 200 receives the first switching instruction, the second control unit 243 is used to control the second switching unit 245 to connect the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244. In this case, the circuit between the first wireless transmitting coil 220 and the second wireless charging unit 244 is disconnected, so that the wireless charger 200 adopts the second wireless transmitting coil 230 for charging, thereby realizing switching the second wireless transmitting coil 230 for charging.

[0263] It should be noted that the charging powers of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 can be the same or different. Compared with a wireless charger with only a single wireless transmitting coil, the wireless charger 200 with two wireless transmitting coils can significantly improve the heating of the wireless charger 200 at the same charging power when adopting the above-mentioned transmitting end alternate charging scheme, and can provide a higher charging power at the same charging temperature requirement. It can be adapted to refer to the above-mentioned Figure 8 Detailed description of the receiving end RX shown.

[0264] For example, please refer to Fig.13 , Fig.13 The transmitter TX of the wireless charging system shown can be the wireless charger 200 described above. Figure 8 , the transmitting end TX includes two second wireless charging units 244.

[0265] One of the second wireless charging units 244 has an input end coupled to the adapter, and an output end coupled to the first wireless transmitting coil 220, for converting an input voltage Vin1 provided by the adapter into an AC voltage and outputting it to the first wireless transmitting coil 220; the other second wireless charging unit 244 has an input end coupled to the adapter, and an output end coupled to the second wireless transmitting coil 230, for converting another input voltage Vin2 provided by the adapter into an AC voltage and outputting it to the second wireless transmitting coil 230. It should be noted that the above content focuses on Figure 8 and Fig.13 The difference between Fig.13 Units not mentioned in the above may be adapted for reference Figure 8 See the relevant instructions in .

[0266] Fig.13 In the embodiment shown, a separate wireless charging unit is configured for each wireless transmitting coil in the transmitting end TX, and the second wireless charging unit 244 is not shared. In this case, there is no need to set up an additional wireless charging unit for multiplexing. Figure 8 The second switching unit 245 shown performs switching.

[0267] based on Fig.13 In the circuit scheme of the transmitter TX shown in FIG. 1 , in other embodiments of the present application, the wireless charger 200 can use the first wireless transmitting coil 220 and the second wireless transmitting coil 230 to charge the smart watch 100 together. When two wireless transmitting coils are used for charging together, the charging temperatures of the two wireless transmitting coils are independently controlled, which is referred to as a transmitter-independent charging scheme in the present application embodiment.

[0268] Specifically, when receiving the first charging instruction, the wireless charger 200 can be used to control the first wireless transmitting coil 220 to provide a first wireless charging input (such as providing a first wireless charging input with a first power) to charge the smart watch 100. When receiving the second charging instruction, the wireless charger 200 can be used to control the second wireless transmitting coil 230 to provide a second wireless charging input (such as providing a first wireless charging input with a first power) to charge the smart watch 100. According to the above description of the receiving end independent control charging scheme and the structure of the transmitting end TX circuit, the wireless charger 200 may also receive the first charging instruction during the charging process using the second wireless transmitting coil 230, and may also receive the second charging instruction during the charging process using the first wireless transmitting coil 220. Based on this, the wireless charger 200 can be used to charge the smart watch 100 using the first wireless transmitting coil 220 and the second wireless transmitting coil 230.

[0269] When the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are used to charge the smart watch 100 together, if the wireless charger 200 receives a second control instruction from the smart watch 100, the second control instruction is used to instruct the wireless charger 200 to reduce the charging power of one of the first wireless transmitting coil 220 and the second wireless transmitting coil 230; then the wireless charger 200 is used to respond to the second control instruction and reduce the charging power of the wireless transmitting coil indicated by the second control instruction.

[0270] Specifically, in the case where the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are used to charge the smart watch 100 together, if the wireless charger 200 receives a third charging instruction from the smart watch 100, the wireless charger 200 is used to reduce the charging power of the first wireless transmitting coil 220 in response to the third charging instruction, for example, the wireless charger 200 controls the first wireless transmitting coil 220 to provide a first wireless charging input having a third power, which is less than the first power. For example, the third power is zero (in this case, the wireless charger 200 is used to control the first wireless transmitting coil 220 to stop providing the first wireless charging input); if the wireless charger 200 receives a fourth charging instruction from the smart watch 100, the wireless charger 200 is used to reduce the charging power of the second wireless transmitting coil 230 in response to the fourth charging instruction, for example, the wireless charger 200 controls the second wireless transmitting coil 230 to provide a second wireless charging input having a fourth power, which is less than the second power, for example, the fourth power is zero (in this case, the wireless charger 200 is used to control the second wireless transmitting coil 230 to stop providing the second wireless charging input).

[0271] Combination Fig.13The second control unit 243 can be used to control one or more of the frequency, duty cycle and input voltage of the PWM square wave to adjust the charging power of the first wireless transmitting coil 220 and the second wireless transmitting coil 230.

[0272] It should be noted that Fig.13 In the embodiment, the charging power of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 can be the same or different. Fig.13 The same reason as the receiver RX, the transmitter alternate charging scheme can also be applied to Fig.13 In the circuit scheme of the transmitter TX shown in FIG. Figure 8 The same reason as in the receiver RX, Figure 8 When the second switching unit 245 shown in the figure adopts two multi-pole multi-throw switches, the independent control charging scheme of the sending end is also applicable to Figure 8 In addition, compared with a wireless charger with only a single wireless transmitting coil, the wireless charger 200 with two wireless transmitting coils can significantly improve the heating of the wireless charger 200 at the same charging power when adopting the above-mentioned transmitting end independent control charging solution, and can provide a higher charging power at the same charging temperature requirement, which can be adaptively referred to the above-mentioned Fig.13 Detailed description of the receiving end RX shown.

[0273] For example, please refer to Fig.17 , Fig.17 The transmitter TX of the wireless charging system shown can be the wireless charger 200 described above. Figure 8 , Fig.17 In the transmitter TX shown in the figure, the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are directly connected to the second wireless charging unit 244 in parallel. The specific connection can be adapted to refer to the aforementioned Fig.17 The first wireless receiving coil 112 and the second wireless receiving coil 117 are connected in parallel to the first wireless charging unit 184. In this embodiment, the first wireless transmitting coil 220 and the second wireless transmitting coil 230 also share the second wireless charging unit 244, which is beneficial to reducing costs and miniaturizing the wireless charger 200.

[0274] based on Fig.17 In the parallel circuit scheme of the receiving end RX shown in FIG. 1 , the second control unit 243 can be used to control the first wireless receiving coil 112 and the second wireless receiving coil 117 to charge the battery 115 together. Fig.17Description of the receiving end RX in . Due to the parallel connection, there is only one wireless charging unit in the wireless charger 200. Once the input voltage Vin and / or the PWM square wave are adjusted, the charging power of the two wireless transmitting coils will be adjusted, and the charging power of one wireless transmitting coil cannot be controlled separately. Once the charging power of one wireless transmitting coil is reduced, the charging power of the other wireless transmitting coil will also be reduced. If one wireless transmitting coil stops charging, the other wireless transmitting coil also stops charging.

[0275] Fig.17 The parallel circuit scheme shown can increase the current on the front-stage trunk (as shown by the position of point X in the figure) while keeping the input voltage Vin unchanged and the charging power of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 unchanged, thereby increasing the charging power of the wireless charger 200. Assuming that the charging power of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 is the same, the charging power of the wireless charger 200 can be doubled. The parallel scheme achieves the improvement of charging power by increasing the current. It should be noted that in some scenarios, the voltage that the second wireless charging unit 244 can receive is relatively low (such as the requirements of the protocols of each chip and device). In this case, the charging power of the wireless charger 200 can be increased by increasing the current through this parallel scheme.

[0276] For example, please refer to Fig.18 , Fig.17 The transmitter TX of the wireless charging system shown can be the wireless charger 200 described above. Fig.17 In the transmitter TX of the wireless charging system, the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are connected in series to the input end of the second wireless charging unit 244. The specific connection can be adaptively referred to the aforementioned Fig.17 The first wireless receiving coil 112 and the second wireless receiving coil 117 are connected in series to the first wireless charging unit 184. In this case, the first wireless transmitting coil 220 and the second wireless transmitting coil 230 also share the second wireless charging unit 244, which is conducive to reducing costs and miniaturizing the wireless charger 200.

[0277] It should be noted that the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are connected in series, and the current in the circuit remains unchanged, but the voltage is increased. When the charging power of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 remains unchanged, Fig.18The series connection scheme shown in the figure can increase the voltage at the position shown by point M in the figure, thereby increasing the charging power of the wireless charger 200. Assuming that the charging power of the first wireless transmitting coil 220 and the second wireless transmitting coil 230 are the same, the charging power of the wireless charger 200 can be doubled. Fig.17 The parallel scheme, Fig.18 The series connection scheme shown achieves an increase in charging power by increasing the voltage.

[0278] It should be noted that in some scenarios, due to high requirements on line loss, the current that can be received by the second wireless charging unit 244 is relatively low. In this case, the charging power of the smart watch 100 can be increased by increasing the voltage through this series connection scheme.

[0279] In addition, an embodiment of the present application also provides a wireless charging method.

[0280] For example, please refer to Fig. 22 , Fig. 22 An interactive diagram of a wireless charging method provided in an embodiment of the present application, the wireless charging method can be applied to Figure 8 or Fig.13 In the wireless charging system shown, the wireless charging method includes the following steps S2201 to S2213:

[0281] S2201: The wireless charger and the smart watch establish handshake communication.

[0282] The so-called handshake communication refers to the charging-related protocol communication performed by the wireless charger 200 and the smart watch 100 before charging, so as to reach an agreement with each other for the subsequent charging process.

[0283] After establishing handshake communication, the wireless charger 200 charges the smart watch 100. During the process of the wireless charger 200 charging the smart watch 100, the smart watch 100 periodically detects the first charging temperature and the second charging temperature. Specifically, the sampling frequency (such as 1ms, 5ms, 20ms) of the smart watch 100 detecting the first charging temperature and the second charging temperature can be set so that the smart watch 100 can achieve periodic detection.

[0284] During the specific implementation, the first charging temperature and the second charging temperature can be measured by respectively setting temperature sensors near the first wireless receiving coil 112 and the second wireless receiving coil 117. By detecting the first charging temperature and the second charging temperature, the temperature of the first wireless receiving coil 112 and the second wireless receiving coil 117 during the charging process can be known to determine whether charging is safe.

[0285] It should be understood that when charging is initially performed, the temperature of the first wireless receiving coil 112 and the second wireless receiving coil 117 is close to room temperature and normal, and both can be used for charging. This embodiment is described by taking the second wireless transmitting coil 230 and the second wireless receiving coil 117 as an example of the coils that are initially charged through the following S2202 and S2203. Of course, in other embodiments, the first wireless transmitting coil 220 and the first wireless receiving coil 112 may also charge the battery 115 initially.

[0286] S2202: The wireless charger provides a second wireless charging input to the smart watch through a second wireless transmitting coil.

[0287] S2203, the smart watch receives a second wireless charging input through a second wireless receiving coil to charge the battery.

[0288] As charging proceeds, the temperature of the second wireless receiving coil 117 becomes higher and higher. The smart watch 100 first detects that the second charging temperature is greater than or equal to a second preset threshold, which is as follows S2204.

[0289] S2204: The smart watch detects that the second charging temperature is greater than or equal to a second preset threshold.

[0290] Specifically, the second preset threshold can be set according to actual needs.

[0291] The second charging temperature is greater than or equal to the second preset threshold, indicating that the temperature of the second wireless receiving coil 117 is too high, and there is a safety hazard in continuing charging. In this case, by executing S2205 and S2206, the first wireless transmitting coil 220 and the first wireless receiving coil 112 are switched to charge, and the second wireless receiving coil 117 is cooled down to ensure charging safety. Among them, switching the first wireless receiving coil 112 to charge the battery 115 means that the second wireless receiving coil 117 stops charging the battery 115 and the first wireless receiving coil 112 charges the battery 115.

[0292] It should be understood that as the second wireless receiving coil 117 stops charging and the space where the second wireless receiving coil 117 is located is cooled, the second charging temperature no longer rises but gradually decreases, thereby ensuring charging safety.

[0293] S2205, the smart watch switches to the first wireless receiving coil to charge the battery.

[0294] It should be noted that for Figure 8S2205 may be executed by the first control unit 183. In order to switch the first wireless receiving coil 112 for charging, when the second charging temperature is greater than or equal to the second preset threshold, the first control unit 183 is further used to control the first switching unit 185 to connect the loop between the first wireless charging unit 184 and the first wireless receiving coil 112, so as to switch the first wireless receiving coil 112 to charge the battery 115.

[0295] S2206: The smart watch sends a first switching instruction to the wireless charger, and the wireless charger receives the first switching instruction from the wireless charger.

[0296] The first switching instruction is used to instruct the wireless charger 200 to use the first wireless transmitting coil 220 to charge the smart watch 100. The first switching instruction can also be used to indicate the charging power of the desired first wireless charging input.

[0297] S2207: In response to the first switching instruction, the wireless charger switches the first wireless transmitting coil to provide a first wireless charging input to charge the smart watch.

[0298] Combination Figure 8 , S2207 may be executed by the second control unit 243. Specifically, in the wireless charger 200, Figure 8 In the case where the second charging temperature is greater than or equal to the second preset threshold, the second control unit 243 is further used to control the second switching unit 245 to connect the loop between the second wireless charging unit 244 and the first wireless transmitting coil 220. In this case, the second wireless charging unit 244 generates an AC voltage to supply the first wireless transmitting coil 220, so that the first wireless transmitting coil 220 generates an AC current (i.e., the first wireless charging input) to charge the smart watch 100, thereby switching the first wireless transmitting coil 220 to charge.

[0299] S2208, the smart watch receives a first wireless charging input through a first wireless receiving coil to charge the battery.

[0300] It should be understood that as charging proceeds, the temperature of the first wireless receiving coil 112 becomes higher and higher, and the smart watch 100 detects that the first charging temperature is greater than or equal to the first preset threshold.

[0301] S2209, the smart watch detects that the first charging temperature is greater than or equal to a first preset threshold.

[0302] Specifically, the first preset threshold can be set according to actual needs.

[0303] The first charging temperature is greater than or equal to the first preset threshold, indicating that the temperature of the first wireless receiving coil 112 is too high, and there is a safety hazard in continuing to charge. In this case, by executing S2210 and S2211, the second wireless transmitting coil 230 and the second wireless receiving coil 117 are switched to charge, and the first wireless receiving coil 112 is cooled down to ensure charging safety. Among them, switching the second wireless receiving coil 117 to charge the battery 115 means that the first wireless receiving coil 112 stops charging the battery 115 and the second wireless receiving coil 117 charges the battery 115.

[0304] It should be understood that as the first wireless receiving coil 112 stops charging and the space where the first wireless receiving coil 112 is located is cooled, the first charging temperature no longer rises but gradually decreases, thereby ensuring charging safety.

[0305] S2210, the smart watch switches to the second wireless receiving coil to charge the battery 115.

[0306] It should be noted that for Figure 8 In order to switch the second wireless receiving coil 117 for charging, when the first charging temperature is greater than or equal to the first preset threshold, the first control unit 183 controls the first switching unit 185 to connect the loop between the first wireless charging unit 184 and the second wireless receiving coil 117, so as to switch the second wireless receiving coil 117 to charge the battery 115.

[0307] S2211, the smart watch sends a second switching instruction to the wireless charger, and the wireless charger receives the second switching instruction from the wireless charger.

[0308] The second switching instruction is used to instruct the wireless charger 200 to use the second wireless transmitting coil 230 to charge the smart watch 100. The second switching instruction can also be used to indicate the charging power of the desired second wireless charging input.

[0309] S2212: In response to the second switching instruction, the wireless charger switches the second wireless transmitting coil to provide a second wireless charging input to charge the smart watch.

[0310] Combination Figure 8 , S2212 may be executed by the second control unit 243. Specifically, in the wireless charger 200, Figure 8In the embodiment, the second control unit 243 controls the second switching unit 245 to connect the loop between the second wireless charging unit 244 and the second wireless transmitting coil 230. In this case, the second wireless charging unit 244 generates an AC voltage to supply the second wireless transmitting coil 230, so that the second wireless transmitting coil 230 generates an AC current (i.e., a second wireless charging input) to charge the smart watch 100, thereby switching the second wireless transmitting coil 230 to charge the smart watch 100.

[0311] S2213, the smart watch receives a second wireless charging input through the second wireless receiving coil to charge the battery 115.

[0312] Fig. 22 In the wireless charging method shown, as the charging process proceeds, the smart watch 100 periodically detects the first charging temperature and the second charging temperature. Fig. 22 The wireless charging method shown alternately satisfies the triggering conditions shown in S2204 or S2209 above, so that the two pairs of coils can be used to charge the battery 115 alternately. Fig. 22 The implementation effect can refer to the aforementioned description of the effects of the alternate charging scheme for the receiving end and the alternate charging scheme for the transmitting end.

[0313] For example, please refer to Fig.23 , Fig.23 An interactive diagram of another wireless charging method provided in an embodiment of the present application, which can be applied to Fig.13 In the wireless charging system shown, the wireless charging method includes the following steps S2301 to S2314:

[0314] S2301: The wireless charger and the smart watch establish handshake communication.

[0315] After establishing the handshake communication, the wireless charger 200 charges the smart watch 100. During the charging process of the wireless charger 200 for the smart watch 100, the smart watch 100 periodically detects the first charging temperature and the second charging temperature.

[0316] At the beginning of charging, the first charging temperature and the second charging temperature are close to room temperature and both meet the requirements. The detection result is as follows S2302.

[0317] S2302: The smart watch detects that the first charging temperature is lower than a first preset threshold, and the second charging temperature is lower than a second preset threshold.

[0318] Fig.23 When the smart watch detects that both the first charging temperature and the second charging temperature meet the requirements, the first wireless receiving coil 112 and the second wireless receiving coil 117 are used to charge the battery 115. Based on this, the following S2303 and S2304 are executed.

[0319] S2303, the smart watch sends a first charging instruction to the wireless charger, and the wireless charger receives the first charging instruction from the wireless charger.

[0320] S2304, the smart watch sends a second charging instruction to the wireless charger, and the wireless charger receives the second charging instruction from the wireless charger.

[0321] It should be noted that S2303 does not necessarily precede S2304, but may also occur after S2304, or simultaneously.

[0322] S2305: The wireless charger controls the first wireless transmitting coil to provide a first wireless charging input in response to the first charging instruction, and controls the second wireless transmitting coil to provide a second wireless charging input in response to the second charging instruction.

[0323] For specific implementation, please refer to the above Fig.13 Description of the receiving-end independent charging solution and the transmitting-end independent charging solution.

[0324] S2306, the smart watch receives a first wireless charging input through the first wireless receiving coil, and receives a second wireless charging input through the second wireless receiving coil to charge the battery.

[0325] As charging proceeds, the temperatures of the first wireless receiving coil 112 and the second wireless receiving coil 117 become higher and higher. Assume that the smart watch 100 first detects that the first charging temperature is greater than or equal to the first preset threshold, that is, S2307 as follows.

[0326] S2307: The smart watch detects that the first charging temperature is greater than or equal to a first preset threshold.

[0327] S2308, the smart watch sends a third charging instruction to the wireless charger, and the wireless charger receives the third charging instruction from the wireless charger.

[0328] S2309: The wireless charger controls the first wireless transmitting coil to stop providing the first wireless charging input in response to the third charging instruction.

[0329] Combination Fig.13 In the wireless charger 200, the second control unit 243 can control the switches in the first second wireless charging unit 244 to be turned off, so that the first wireless transmitting coil 220 cannot generate an alternating current to charge the smart watch 100, thereby controlling the first wireless transmitting coil 220 to stop the first wireless charging input. Of course, in other embodiments, the first wireless transmitting coil 220 can be controlled to stop charging the smart watch in other ways, such as stopping the supply of the input voltage Vin1.

[0330] It should be understood that as the first wireless transmitting coil 220 stops providing the first wireless charging input, the first wireless receiving coil 112 stops charging the battery 115 because it does not receive the first wireless charging input, as shown in S2310 below.

[0331] S2310: The first wireless receiving coil stops charging the battery.

[0332] S2311, the smart watch detects that the second charging temperature is greater than or equal to the second preset threshold.

[0333] S2312, the smart watch sends a fourth charging instruction to the wireless charger, and the wireless charger receives the fourth charging instruction from the wireless charger.

[0334] S2313: The wireless charger controls the second wireless transmitting coil to stop providing the second wireless charging input in response to the fourth charging instruction.

[0335] Combination Fig.13 In the wireless charger 200, the second control unit 243 can control the switches in the second wireless charging unit 244 to be turned off, so that the second wireless transmitting coil 230 cannot generate an alternating current to charge the smart watch 100, thereby controlling the second wireless transmitting coil 230 to stop charging the smart watch 100. Of course, in other embodiments, the second wireless transmitting coil 230 can be controlled to stop providing the second wireless charging input to charge the smart watch in other ways, such as stopping the supply of the input voltage Vin1.

[0336] It should be understood that as the second wireless transmitting coil 230 stops providing the second wireless charging input, the second wireless receiving coil 117 stops charging the battery 115 because it does not receive the second wireless charging input, as shown in S2314 below.

[0337] S2314, the second wireless receiving coil stops charging the battery.

[0338] It should be noted that Fig.23 The wireless charging method shown only illustrates a portion of the charging process. It should be understood that as the second wireless receiving coil 117 and the first wireless receiving coil 112 stop charging and heat dissipation proceeds, the second charging temperature and the first charging temperature gradually decrease. As the charging process proceeds, when the smart watch 100 periodically detects the first charging temperature and the second charging temperature, the second charging temperature alternately satisfies the trigger conditions shown in S2302 and S2311 above, and the first charging temperature alternately satisfies the trigger conditions shown in S2302 and S2307 above, until the smart watch 100 is fully charged.

[0339] Fig.23In the embodiment, when it is detected that any one of the first charging temperature and the second charging temperature does not meet the requirement, directly controlling the wireless transmitting coil to stop providing wireless charging input is introduced as an example. In other embodiments, the charging power of the corresponding wireless transmitting coil can also be reduced. Fig.23 The implementation effect can refer to the above description of the effect of the receiving end independent control charging scheme and the transmitting end independent control charging scheme.

[0340] It should be noted that the above embodiment is described by taking the smart watch 100 and the wireless charger 200 as examples in which each includes two coils. In other embodiments, the smart watch 100 and the wireless charger 200 may also include more coils. The position distribution and charging scheme of the multiple coils may be adaptively referred to the implementation of the above two coils, which is also within the protection scope of the present application.

[0341] In the above embodiments, the description of each embodiment has its own emphasis. For the part that is not described or recorded in detail in a certain embodiment, please refer to the relevant description of other embodiments. The above embodiments are only used to illustrate the technical solution of the present application, not to limit it; although the present application is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application, and should be included in the protection scope of the present application.

Claims

1. A terminal device, characterized in that: include: Display screen; A rear housing, arranged opposite to the display screen; A battery, disposed between the display screen and the rear housing; The first wireless receiving coil is coupled to the battery and is disposed on the back side of the display screen for wirelessly charging the battery. The back side of the display screen refers to a side of the display screen facing the rear housing.

2. The terminal device according to claim 1, characterized in that: The terminal device also includes a second wireless receiving coil, which is arranged in the terminal device and located outside the back side of the display screen, and is coupled to the battery for wirelessly charging the battery.

3. The terminal device according to claim 2, characterized in that: The second wireless receiving coil is arranged on the back side of the rear cover, and the back side of the rear cover refers to a side of the rear cover facing the display screen.

4. The terminal device according to claim 2 or 3, characterized in that: The terminal device also includes a first control unit, a first wireless charging unit and a first switching unit; The output end of the first wireless charging unit is coupled to the battery, and the input end of the first wireless charging unit is coupled to the output end of the first switching unit; The first control unit is connected to the first switching unit, and is used to control the input end of the first switching unit to be connected to at least one of the first wireless receiving coil and the second wireless receiving coil, so as to conduct the loop between the at least one wireless receiving coil and the first wireless charging unit.

5. The terminal device according to claim 4, characterized in that: In a case where the circuit between either the first wireless receiving coil or the second wireless receiving coil and the first wireless charging unit is connected, and the circuit between the other wireless receiving coil and the first wireless charging unit is disconnected, if the charging temperature of either wireless receiving coil does not meet the requirement, the first control unit is used to control the first switching unit to disconnect the circuit between either wireless receiving coil and the first wireless charging unit and connect the circuit between the other wireless receiving coil and the first wireless charging unit.

6. The terminal device according to any one of claims 1 to 4, characterized in that: When the battery is wirelessly charged using either the first wireless receiving coil or the second wireless receiving coil, if the charging temperature of either wireless receiving coil does not meet the requirement, the terminal device is used to switch the wireless receiving coil for wireless charging the battery from either wireless receiving coil to the other of the first wireless receiving coil and the second wireless receiving coil.

7. The terminal device according to any one of claims 1 to 6, characterized in that: In a case where the wireless receiving coil for wirelessly charging the battery is switched from any one of the wireless receiving coils to the other wireless receiving coil, the terminal device is also used to output a first control instruction, wherein the first control instruction is used to instruct the wireless charger that powers the terminal device to use the wireless transmitting coil corresponding to the other wireless receiving coil to charge the terminal device.

8. The terminal device according to claim 2 or 3, characterized in that: The terminal device also includes a first control unit and a first wireless charging unit; The output end of the first wireless charging unit is connected to the battery, the first wireless charging unit is connected to the first control unit, and the input end of the first wireless charging unit is also connected to the first wireless receiving coil and the second wireless receiving coil; The first control unit is used to control the first wireless receiving coil and the second wireless receiving coil to charge the battery together.

9. The terminal device according to claim 2 or 3, characterized in that: In the case where the first wireless receiving coil and the second wireless receiving coil are used to jointly wirelessly charge the battery, if the charging temperature of any one of the first wireless receiving coil and the second wireless receiving coil does not meet the requirement, the terminal device is used to output a second control instruction to the wireless charger that powers the terminal device, and the second control instruction is used to instruct the wireless charger to reduce the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils.

10. The terminal device according to any one of claims 1 to 9, characterized in that: The terminal device is a smart watch.

11. The terminal device according to claim 10, characterized in that: The smart watch comprises a dial; The display screen, the battery and the back cover all belong to the watch dial; The dial further includes a metal decorative piece, which is located on a side of the battery facing the display screen and surrounds the display screen; wherein the metal decorative piece and the first wireless receiving coil do not overlap in their orthographic projections on the rear shell.

12. A wireless charger, characterized in that: The wireless charger comprises: a first supporting part and a second supporting part, wherein a first wireless transmitting coil is arranged on the first supporting part; In which, when the terminal device is located at the charging position of the wireless charger, the terminal device is located between the first supporting part and the second supporting part, and the first supporting part is opposite to the display screen of the terminal device so that the first wireless transmitting coil provides charging input for the first wireless receiving coil deployed in the terminal device.

13. The wireless charger according to claim 12, characterized in that: A second wireless transmitting coil is also disposed on the second supporting portion; The second wireless transmitting coil disposed on the second supporting portion is opposite to the second wireless receiving coil in the terminal device to provide charging input for the second wireless receiving coil.

14. The wireless charger according to claim 13, characterized in that: The second supporting portion is opposite to the rear shell of the terminal device.

15. The wireless charger according to any one of claims 12 to 14, characterized in that: Also includes a clamping portion; The first supporting portion and the second supporting portion are respectively connected to the clamping portion, and the first supporting portion and the second supporting portion are arranged opposite to each other in a charging state; The clamping portion is used to clamp the terminal device between the first supporting portion and the second supporting portion in a charging state.

16. The wireless charger according to claim 15, characterized in that: The angle between the first supporting portion and the second supporting portion is adjustable.

17. The wireless charger according to claim 16, characterized in that: The clamping portion includes a first clamping arm, a second clamping arm and a connecting seat; The first supporting portion is arranged at the first end of the first clamp arm; the second supporting portion is arranged at the first end of the second clamp arm; the connecting seat is rotatably connected to the second end of the first clamp arm and the second end of the second clamp arm respectively, and the first clamp arm and / or the second clamp arm can rotate around the connecting seat.

18. The wireless charger according to any one of claims 13 to 17, characterized in that: In the case where one of the first wireless transmitting coil and the second wireless transmitting coil is used to charge the terminal device, the wireless charger is used to: Receiving a first control instruction from the terminal device; the first control instruction is used to instruct the wireless charger to use the other wireless transmitting coil of the first wireless transmitting coil and the second wireless transmitting coil to charge the terminal device; In response to the first control instruction, the wireless transmitting coil for charging the terminal device is switched from the one wireless transmitting coil to the other wireless transmitting coil.

19. The wireless charger according to any one of claims 12 to 17, characterized in that: When the first wireless transmitting coil and the second wireless transmitting coil are used to charge the terminal device together, the wireless charger is used to: receiving a second control instruction from the terminal device; the second control instruction is used to instruct the wireless charger to reduce the charging power of one of the first wireless transmitting coil and the second wireless transmitting coil; In response to the second control instruction, the charging power of the wireless transmitting coil indicated by the second control instruction is reduced.

20. A wireless charging method, characterized in that: Applied in a terminal device, the terminal device is provided with a first wireless receiving coil and a second wireless receiving coil, the first wireless receiving coil is provided on the back side of a display screen of the terminal device, and the second wireless receiving coil is provided on the back side of a rear shell of the terminal device, the method comprising: In a process in which at least one of the first wireless receiving coil and the second wireless receiving coil performs wireless charging for the terminal device, obtaining a charging temperature of each of the at least one wireless receiving coil; Adjust the charging power of the terminal device according to the charging temperature of each of the wireless receiving coils.

21. The wireless charging method according to claim 20, characterized in that: In the case where either the first wireless receiving coil or the second wireless receiving coil performs wireless charging for the terminal device, adjusting the charging power of the terminal device according to the charging temperature of each of the wireless receiving coils includes: If the charging temperature of any one of the wireless receiving coils does not meet the requirement, the other one of the first wireless receiving coil and the second wireless receiving coil is used to wirelessly charge the terminal device.

22. The wireless charging method according to claim 21, characterized in that: In the case where the charging of the terminal device by any one of the wireless receiving coils is switched to wirelessly charging the terminal device by using the other wireless receiving coil, the method further includes: A first control command is sent to the wireless charger, where the first control command is used to instruct the wireless charger to use the wireless transmitting coil corresponding to the other wireless receiving coil to wirelessly charge the terminal device.

23. The wireless charging method according to claim 20, characterized in that: In the case where the first wireless receiving coil and the second wireless receiving coil are used together to wirelessly charge the terminal device, adjusting the charging power of the terminal device according to the charging temperature of each of the wireless receiving coils includes: If the charging temperature of any one of the first wireless receiving coil and the second wireless receiving coil does not meet the requirements, the terminal device is used to output a second control instruction, and the second control instruction is used to instruct the wireless charger to reduce the charging power of the wireless transmitting coil corresponding to any one of the wireless receiving coils.

24. A wireless charging system, characterized in that: include: The terminal device according to any one of claims 1 to 11; as well as, The wireless charger according to any one of claims 12 to 19 is used to receive an input voltage input by an adapter to wirelessly charge the terminal device.

25. The wireless charging system according to claim 24, characterized in that: Also included is the adapter; The adapter is used to couple with the wireless charger in a charging state to provide the input voltage to the wireless charger.

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