Wireless charging system and wireless charging method

Abstract

Embodiments of this application disclose a wireless charging system. The wireless charging system includes a first electronic device, a wireless charging device, and a second electronic device. The wireless charging device is located between the first electronic device and the second electronic device. The wireless charging device is an auxiliary device of the first electronic device and is physically connected to the first electronic device, the wireless charging device includes a receiver circuit and a housing, the receiver circuit includes a receiver coil, and the receiver coil is located on an inner side of the housing. The first electronic device is configured to: charge the wireless charging device, charge the second electronic device through the wireless charging device, and receive power from the second electronic device through the wireless charging device.

What is claimed is: 
     
         1 . A wireless charging apparatus, comprising a first electronic device and an auxiliary device that belongs to the first electronic device, wherein the auxiliary device is physically connected to the first electronic device, the first electronic device is configured to charge the auxiliary device, the auxiliary device comprises a receiver circuit and a housing, the receiver circuit comprises a receiver coil, and the receiver coil is located on an inner side of the housing; and
 when the wireless charging apparatus charges a second electronic device located on an outer side of the wireless charging apparatus, a magnetic field transmitted by the first electronic device charges the second electronic device through the auxiliary device; or   when the wireless charging apparatus receives reverse charging from a second electronic device located on an outer side of the wireless charging apparatus, the first electronic device receives a magnetic field that is from the second electronic device and that penetrates the auxiliary device.   
     
     
         2 . The wireless charging apparatus according to  claim 1 , wherein there is no magnetic material between the receiver coil and the inner side of the housing, or an area of a magnetic material between the receiver coil and the inner side of the housing is less than a preset threshold. 
     
     
         3 . The wireless charging apparatus according to  claim 1 , wherein when the first electronic device charges the second electronic device through the auxiliary device, or receives the reverse charging from the second electronic device through the auxiliary device, a wireless charging receiving function of the receiver circuit is in a disabled state. 
     
     
         4 . The wireless charging apparatus according to  claim 3 , wherein the receiver circuit further comprises an output switch and an ASK modulation circuit; and
 when the wireless charging receiving function of the receiver circuit is in a disabled state, both the output switch and the ASK modulation circuit are in an opened state; or   when the wireless charging receiving function of the receiver circuit is in an enabled state, both the output switch and the ASK modulation circuit are in a closed state.   
     
     
         5 . The wireless charging apparatus according to  claim 1 , wherein the receiver circuit further comprises one or more first switches, a matching circuit, and a rectifier circuit, and the at least one first switch is located between the receiver coil and the matching circuit, and/or the at least one first switch is located between the matching circuit and the rectifier circuit. 
     
     
         6 . The wireless charging apparatus according to  claim 1 , wherein a self-resonant frequency of the auxiliary device is greater than a maximum working frequency at which the first electronic device charges the second electronic device or receives wireless power from the second electronic device. 
     
     
         7 . The wireless charging apparatus according to  claim 4 , wherein the receiver circuit further comprises a controller, and when receiving a wireless charging requirement, the controller and/or an application processor (AP) of the auxiliary device control/controls both the output switch and the ASK modulation circuit to be in a closed state. 
     
     
         8 . The wireless charging apparatus according to  claim 7 , wherein after the charging of the auxiliary device is completed, the controller is configured to: control the ASK modulation circuit to send, to the first electronic device, information used to indicate that the charging is completed, and control the ASK modulation circuit and the output switch to switch from a closed state to an opened state. 
     
     
         9 . The wireless charging apparatus according to  claim 5 , wherein the receiver circuit further comprises a controller, and when receiving a wireless charging requirement, the controller and/or a processor of the auxiliary device control/controls the one or more first switches, the output switch, and the ASK modulation circuit to be in a closed state. 
     
     
         10 . The wireless charging apparatus according to  claim 9 , wherein after the charging of the auxiliary device is completed, the controller is configured to: control the ASK modulation circuit to send, to the first electronic device, information used to indicate that the charging is completed, and control the one or more first switches, the ASK modulation circuit, and the output switch to switch from a closed state to an opened state. 
     
     
         11 . The wireless charging apparatus according to  claim 1 , wherein the first electronic device is a tablet, and the auxiliary device is a keyboard. 
     
     
         12 . A wireless charging system, comprising a first electronic device, a wireless charging device, and a second electronic device, wherein the wireless charging device is located between the first electronic device and the second electronic device, the wireless charging device is an auxiliary device of the first electronic device and is physically connected to the first electronic device, the wireless charging device comprises a receiver circuit and a housing, the receiver circuit comprises a receiver coil, and the receiver coil is located on an inner side of the housing; and
 the first electronic device is configured to: charge the wireless charging device, charge the second electronic device through the wireless charging device, and receive power from the second electronic device through the wireless charging device.   
     
     
         13 . The system according to  claim 12 , wherein when the first electronic device charges the second electronic device or receives the power from the second electronic device, an electromagnetic field between the first electronic device and the second electronic device penetrates the wireless charging device. 
     
     
         14 . The system according to  claim 12 , wherein there is no magnetic material between the receiver coil and the inner side of the housing, or an area of a magnetic material between the receiver coil and the inner side of the housing is less than a preset threshold. 
     
     
         15 . The system according to  claim 12 , wherein
 when the first electronic device charges the second electronic device or receives the power from the second electronic device, a wireless charging receiving function of the receiver circuit is in a disabled state; or   when the first electronic device charges the auxiliary device, a wireless charging receiving function of the receiver circuit is in an enabled state.   
     
     
         16 . The system according to  claim 15 , wherein the receiver circuit further comprises an output switch and an amplitude shift keying ASK modulation circuit; and
 when the wireless charging receiving function of the receiver circuit is in a disabled state, both the output switch and the ASK modulation circuit are in an opened state; or   when the wireless charging receiving function of the receiver circuit is in an enabled state, both the output switch and the ASK modulation circuit are in a closed state.   
     
     
         17 . The system according to  claim 16 , wherein
 the wireless charging device is specifically configured to determine, according to an instruction entered by a user or detection information of a sensor, that the wireless charging device has a wireless charging requirement; or   the wireless charging device is specifically configured to: receive first information from the first electronic device, and determine, based on the first information, that the wireless charging device has a wireless charging requirement, wherein the first information is used to indicate that the wireless charging device has a wireless charging requirement.   
     
     
         18 . The system according to  claim 17 , wherein
 when the wireless charging device has a wireless charging requirement, both the output switch and the ASK modulation circuit are in a closed state.   
     
     
         19 . The system according to  claim 16 , wherein
 the wireless charging device is further configured to: when the charging of the wireless charging device is completed, send second information to the first electronic device, wherein the second information is used to indicate that the charging of the wireless charging device is completed; and   the wireless charging device is further configured to: after sending the second information, disable a modulation function of the ASK modulation circuit, and open the output switch.   
     
     
         20 . The system according to  claim 15 , wherein the receiver circuit further comprises one or more first switches, a matching circuit, and a rectifier circuit; two ends of the receiver coil are connected to an input end of the matching circuit, and an output end of the matching circuit is connected to an input end of the rectifier circuit; and the one or more first switches are disposed between the receiver coil and the matching circuit or between the matching circuit and the input end of the rectifier circuit; and
 when the wireless charging receiving function of the receiver circuit is in a disabled state, the one or more first switches are in an opened state; or   when the wireless charging receiving function of the receiver circuit is in an enabled state, the one or more first switches are in a closed state.