Peer to peer self-optimizing resonant inductive charger
First Claim
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1. A mobile device, comprising:
- a battery;
device electronics powered by the battery, including a mobile wireless communication transceiver and a short range transceiver;
a charging circuit in electronic connection with the battery; and
a coil coupled to the charging circuit, the coil configured for wireless resonant inductive coupling with a tunable coil system of a wireless inductive charging device and for charging the battery via the charging circuit when wirelessly coupled to the tunable coil system; and
wherein the mobile device is configured to;
determine a power transfer efficiency between the coil and the tunable coil system during the wireless resonant inductive coupling for the charging of the battery, andtransmit to the wireless inductive charging device via the short range transceiver a signal to cause the wireless inductive charging device to increase power transfer by changing a setting of the tunable coil system to improve the power transfer efficiency between the coil and the tunable coil system when the determined power transfer efficiency is lower than a target efficiency level,a controller of the wireless inductive charging device changing the setting of the tunable coil system to improve the power transfer efficiency between the coil and the tunable coil system based on the signal,the changing of the setting of the tunable coil system including switching power transmission from a first coil of the tunable coil system to a second coil of the tunable coil system based on an orientation of the second coil to improve the power transfer efficiency.
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Abstract
Inductive wireless charging for mobile devices are described that utilize resonant inductive coupling between a wireless inductive charging device and the battery of the mobile device. The power transfer from the charging device to the mobile device is adjustable. Signals are sent between the devices to determine power transfer efficiency and to adjust settings to approach or achieve a desired target efficiency.
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Citations
20 Claims
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1. A mobile device, comprising:
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a battery; device electronics powered by the battery, including a mobile wireless communication transceiver and a short range transceiver; a charging circuit in electronic connection with the battery; and a coil coupled to the charging circuit, the coil configured for wireless resonant inductive coupling with a tunable coil system of a wireless inductive charging device and for charging the battery via the charging circuit when wirelessly coupled to the tunable coil system; and wherein the mobile device is configured to; determine a power transfer efficiency between the coil and the tunable coil system during the wireless resonant inductive coupling for the charging of the battery, and transmit to the wireless inductive charging device via the short range transceiver a signal to cause the wireless inductive charging device to increase power transfer by changing a setting of the tunable coil system to improve the power transfer efficiency between the coil and the tunable coil system when the determined power transfer efficiency is lower than a target efficiency level, a controller of the wireless inductive charging device changing the setting of the tunable coil system to improve the power transfer efficiency between the coil and the tunable coil system based on the signal, the changing of the setting of the tunable coil system including switching power transmission from a first coil of the tunable coil system to a second coil of the tunable coil system based on an orientation of the second coil to improve the power transfer efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless inductive charging device, comprising:
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a power source; a transceiver; a tunable coil system configured for wireless resonant inductive coupling with a coil coupled to a battery of a mobile device and for resonantly inductively charging the battery when wirelessly coupled to the coil of the mobile device; and a controller configured to adjust power transfer between the tunable coil system and the coil by changing a setting of the tunable coil system; and wherein the wireless inductive charging device is configured to; determine a target power transfer efficiency between the tunable coil system and the coil of the mobile device for charging of the battery, and increase the power transfer between the tunable coil system and the coil by changing the setting of the tunable coil system to approach the determined target power transfer efficiency, the controller changing the setting of the tunable coil system to approach the determined target power transfer efficiency, the changing of the setting of the tunable coil system including switching power transmission from a first coil of the tunable coil system to a second coil of the tunable coil system based on an orientation of the second coil to improve a power transfer efficiency. - View Dependent Claims (10, 11, 12, 13)
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14. A mobile device, comprising:
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a battery; device electronics powered by the battery, including a mobile wireless communication transceiver and a short range transceiver; a charging circuit in electronic connection with the battery; and a coil coupled to the charging circuit, the coil configured for wireless resonant inductive coupling with tunable coil systems of wireless inductive charging devices and for charging the battery via the charging circuit when wirelessly coupled to tunable coil system; and wherein the mobile device is configured to; receive a first signal via the short range transceiver from a first wireless inductive charging device that is indicative of power transfer efficiency between the coil and a first tunable coil system of the first wireless inductive charging device, receive a second signal via the short range transceiver from a second wireless inductive charging device that is indicative of power transfer efficiency between the coil and a second tunable coil system of the second wireless inductive charging device, determine between which of the first wireless inductive charging device and the second wireless inductive charging device provides a power transfer efficiency that meets or exceeds a target efficiency level based on receiving the first signal or the second signal, inductively couple the coil to the first tunable coil system or the second tunable coil system based on determining which of the first wireless inductive charging device or the second wireless inductive charging device provides the power transfer efficiency that meets or exceeds the target efficiency level, and transmit, via the short range transceiver, a signal indicative of the power transfer efficiency that meets or exceeds the target efficiency level between the coil and either the first tunable coil system or the second tunable coil system, causing either the first wireless inductive charging device to increase a power transfer by changing a setting of the first tunable coil system, or the second wireless charging device to increase the power transfer by changing a setting of the second tunable coil system, at least one of a first controller, of the first wireless inductive charging device, changing the setting of the first tunable coil system or a second controller, of the second wireless inductive charging device, changing the setting of the second tunable coil system to improve the power transfer efficiency between the coil and either the first tunable coil system or the second tunable coil system based on the signal, at least one of
the setting of the first tunable coil system or
the setting of the second tunable coil system including at least a combination of two or more of;a Q factor, a coupling coefficient, a coil size activation, a coil orientation, or a resonant frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification