Way back in 3rd quarter 2013 Apple has initially created Apple's first major wireless charging system for the iMac in a report entitled "Apple Reveals Master Details of Wireless Charging System." The main patent from this report is presented below.
Apple notes that creating electronic devices and electronic device accessories with desired wireless charging attributes can be challenging. In other devices, antennas are compact, but are sensitive to the position of the antennas relative to external objects.If no care is taken, antennas may be blocked or otherwise not working as expected
Some electronic accessories have batteries, but the batteries may need to be recharged often, so it would be desirable to be able to provide improved tr relentless circuits for electronic devices and accessories for electronic equipment.
Apple's invention covers a wireless power transmission system having a wireless power receiving unit configured to receive power from a wireless power transmission unit. The wireless power transmission device may comprise an antenna configured to transmit wireless charge signals to the wireless power receiving device. The wireless power transmission device may have a conductive housing portion at a front surface and a reflector at a rear surface forming a cavity for the antenna. The antenna can be a slotted antenna formed by a slot in the conductive housing part or a patch antenna formed in an opening in the conductive housing part. The wireless power supply can be a desktop computer. The stationary computer may include a display having a transparent cover layer resting on an upper edge of the conductive housing portion. The wireless current receiving device may include an antenna which receives the wireless charging signals from the wireless power transmission device. The wireless power receiving device may include rectifier circuits which convert signals from the antenna to a correspondingly retrieved current voltage which may be used to charge a battery in the wireless power receiving unit. The antenna may be a slot antenna or a reverse F antenna with portions formed by a conductive housing for the wireless power receiver unit. The wireless power receiving device can be a keyboard, a trackpad, or a computer mouse. The wireless charge signals can be transmitted from the wireless power transmission device to the wireless power receiving device at a frequency between 500 MHz and 6000 MHz (e.g., 900 MHz) or another desired frequency.
Apple's Patent FIG. 3 below is a perspective view of an illustrative wireless charging system with a desktop computer and keyboard; FIG. 4 is a perspective view of an illustrative wireless charging system with a desktop computer and a trackpad; FIG. 5 is a perspective view of an illustrative wireless charging system with a desktop computer and a computer mouse.
Apple patent Figure 10 below is a perspective view of an illustrative wireless power transfer unit with a slotted antenna .
Apple's Patent FIG. 11 above is a perspective view of an illustrative wireless power transmission device having a patch antenna; FIG. 12 is a perspective view of an illustrative multi-antenna wireless power transmission device for transmitting wireless power signals.
Apple's Patent FIG. 13 below is a side view of an illustrative wireless power supply (an iMac) configured to route wireless power signals to a wireless power receiving unit (accessory, keyboard, etc.)