Wireless charging system and wireless charging method
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.
1 . A wireless charging apparatus, comprising:
a receiver circuit having a receiver coil; and
a housing enclosing the receiver circuit, wherein the receiver coil of the receiver circuit located on an inner side of the housing;
a controller configured to determine whether the wireless charging apparatus has a wireless charging requirement, wherein the wireless charging apparatus configured to be positioned between a first electronic device and a second electronic device, the wireless charging apparatus is physically connected to the first electronic device and extends functions of the first electronic device as an auxiliary device used together with the first electronic device; and
upon determining that the wireless charging apparatus has the wireless charging requirement, to enable
the receiver circuit to receive wireless power, via the receiver coil, from the first electronic device or the second electronic device; and
upon determining that the wireless charging apparatus does not have the wireless charging requirement, to receive an electromagnetic field to be transparently transmitted between the first electronic device and the second electronic device, through the receiver coil.
2 . The wireless charging apparatus according to claim 1 , wherein the receiver coil and the inner side of the housing are free from substantial magnetic material therebetween as measured by an area of a magnetic material compared to a preset area threshold.
3 . The wireless charging apparatus according to claim 1 , wherein when the first electronic device is configured to the second electronic device through the receiver coils, or is configured to receive a reverse charging from the second electronic device through the receiver coils, wherein the receiver circuit is operating with a wireless charging receiving function being in a disabled state.
4 . The wireless charging apparatus according to claim 3 , 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 open 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 4 , wherein the receiver circuit further comprises one or more first switches, a matching circuit, and a rectifier circuit, wherein at least one of the one or more first switches 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 wireless charging apparatus 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 controller is configured to receive a wireless charging requirement, and the controller and/or an application processor (AP) of the wireless charging apparatus are configured to control both the output switch and the ASK modulation circuit to be in a closed state for receiving the wireless power.
8 . The wireless charging apparatus according to claim 7 , wherein after charging of the wireless charging apparatus is completed, the controller is configured to: control the ASK modulation circuit to send, to the first electronic device, information indicating 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 controller is configured to receive a wireless charging requirement, and the controller and/or a processor of the wireless charging apparatus are configured to control 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 charging of the wireless charging apparatus is completed, the controller is configured to: control the ASK modulation circuit to send, to the first electronic device, information indicating 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 wireless charging apparatus is a keyboard physically connected to the tablet and receives power from the tablet wirelessly.
12 . A wireless charging system, comprising:
a first electronic device;
a second electronic device configured to transfer power wirelessly with the first electronic device; and
a wireless charging device physically connected to the first electronic device and positioned between the first electronic device and the second electronic device, the wireless charging device comprising:
a housing;
a receiver circuit enclosed by the housing, the
receiver circuit including a receiver coil located on an inner side of the housing; and
a controller configured to determine whether the wireless charging device has a wireless charging requirement, and
upon determining that the wireless charging device has the wireless charging requirement, to enable the receiver circuit to receive wireless power, via the receiver coil, from the first electronic device or the second electronic device; and
upon determining that the wireless charging device does not have the wireless charging requirement, to receive an electromagnetic field to be transparently transmitted between the first electronic device and the second electronic device, through the receiver coil.
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 the wireless charging device is free from a substantial magnetic material between the receiver coil and the inner side of the housing such that an area of the magnetic material 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 wireless charging 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.