Patent
Wireless charging systems and methods
TLDR
In this paper, an embodiment of a system for wirelessly charging a wrist-worn device may include a radio frequency charging energy generating element, and an antenna configured to radiate the RF charging energy, the antenna comprising a first coil and a second coil, each comprising a plurality of windings, the windings of the first coil being wound in a direction opposite the direction of the second coil.Abstract:
An embodiment of a system for wirelessly charging a wrist-worn device may include a radio frequency (RF) charging energy generating element, and an antenna configured to radiate the RF charging energy, the antenna comprising a first coil and a second coil, the first coil and the second coil each comprising a plurality of windings, the windings of the first coil being wound in a direction opposite the direction of the windings of the second coil. An embodiment of a wrist-worn charge-receiving device may include an antenna coil adapted to receive radio frequency (RF) charging energy, the antenna coil comprising non-uniform windings; and a rechargeable power source coupled to the antenna coil, the antenna coil adapted to provide the RF charging energy to the rechargeable power source.read more
Citations
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Patent
Wireless power transmission with selective range
TL;DR: In this article, the authors describe a methodology for wireless power transmission based on pocket-forming, which may include one transmitter and at least one or more receivers, being the transmitter the source of energy and the receiver the device that is desired to charge or power.
Patent
System and method for controlling communication between wireless power transmitter managers
Douglas Bell,Michael Leabman +1 more
TL;DR: In this paper, a method for controlling communication between wireless power transmitter managers is disclosed, where a WiFi connection may be established between WPT managers to share information between system devices, and a WPT manager may need to fulfill two conditions to control power transfer over a customer device; customer device's signal strength threshold has to be significantly greater than 50%, such as 55% or more of the signal strength measured by all other wireless power transmitters and has to remain significantly higher than 50% for a minimum amount of time.
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Receivers for Wireless Power Transmission
TL;DR: In this article, the authors provide various electric receiver arrangements which may be used to provide wireless power transmission using suitable power transmission techniques such as pocket-forming, where receivers may include at least one antenna connected to at least two rectifiers and one power converter.
Patent
Portable wireless charging pad
TL;DR: In this article, a method and apparatus for improved wireless charging pads for charging and/or powering electronic devices is presented, which does not require a power chord for connecting to a main power supply, for example a wall outlet.
References
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Patent
Contact-less power transfer
TL;DR: In this paper, a system and method for transferring power without requiring direct electrical conductive contacts is described, where a primary unit having a power supply and a substantially laminar charging surface having at least one conductor that generates an electromagnetic field when a current flows there through and having an charging area defined within a perimeter of the surface, the at least conductor being arranged such that electromagnetic field lines generated by the at most one conductor are substantially parallel to the plane of the ground surface or at least subtend an angle of 45° or less to the surface within the charging area.
Patent
Method and apparatus for wireless powering and recharging
TL;DR: In this article, an arrangement for charging a charge storage device by placing the charge storage devices in an RF or microwave radiation field is provided, where one or more antennas connected to the antennas rectify the received RF electromagnetic field an produce a DC output current, which is used to charge the device.
Patent
Power transmission control device, power reception control device, non-contact power transmission system, power transmission device, power reception device, and electronic instrument
Kota Onishi,Kentaro Yoda,Haruhiko Sogabe,Takahiro Kamijo,Kuniharu Suzuki,Hiroshi Kato,Katsuya Suzuki,Manabu Yamazaki +7 more
TL;DR: A power reception device transmits authentication information (e.g., start code, manufacturer ID, product ID, rated power information, and resonance characteristic information) to a power transmission device before starting normal power transmission by a non-contact power transmission system as discussed by the authors.
Patent
Resonance type non-contact charging apparatus
Shimpei Sakoda,Kazuyoshi Takada +1 more
TL;DR: In this paper, a non-contact charging system with a DC/DC converter and a battery has been described, where the duty cycle of the converter is controlled such that the input impedance of the resonance system at the resonant frequency and the output impedance of a high frequency power source match each other.
Patent
Rf powered specialty lighting, motion, sound
TL;DR: In this paper, a system for wirelessly powering an item is described, where a source is configured to send wireless power to a target and the target converts the wireless power into a usable power.