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US 11,108,277 B2Granted
Wireless power transfer control based on required and received power error
AssigneeApple Inc.
InventorJeffrey Douglas Louis
Life of this patent
Estimating the term…
Abstract
A system for wireless power transfer control comprising a receiver for receiving and consuming power, a transmitter for transmitting power, wherein the receiver is configured to generate and send a message to the transmitter, the transmitter is configured to control an output level transmitted to the receiver based on the message, and wherein the receiver or the transmitter is configured to perform a corrective action if a magnitude of the message exceeds a power error threshold for a threshold time.
Claims25
A transmitter for wireless power transfer comprising:
- a power transmitting coil;
- and
- control circuitry coupled to the power transmitting coil configured to:
- receive a plurality of messages from a wireless power receiver, the plurality of messages allowing closed loop control of transmitter operation by the receiver;
- monitor error indicators from the plurality of messages, the error indicators representing a magnitude of a difference between a power need of the receiver and power provided by the transmitter;
- exert closed loop control of a wireless power transfer output level transmitted to the wireless power receiver based on at least some of the error indicators from the plurality of messages;
- determine whether the error indicators exceed a non-zero power error threshold for a threshold time, wherein the threshold time is less than a control error packet timeout of the transmitter, the control error packet timeout being selected to prevent shutdown of the transmitter because of lost communication with the receiver;
- and
- in accordance with determining that the error indicators exceed the non-zero power error threshold for the threshold time, perform a corrective action.
6 more elements
A transmitter for wirelessly transmitting power comprising:
- a power transmitting coil;
- and
- control circuitry coupled to the power transmitting coil configured to:
- receive a plurality of messages from a wireless power receiver, the plurality of messages allowing closed loop control of transmitter operation by the receiver;
- monitor error indicators from the plurality of messages, the error indicators representing a magnitude of a difference between a power need of the receiver and power provided by the transmitter;
- exert closed loop control of a wireless power transfer output level transmitted to the wireless power receiver based on at least some of the error indicators from the plurality of messages;
- in response to at least some of the error indicators from the plurality of messages indicating an equilibrium state in which the error indicators do not exceed a non-zero power error threshold, set an output threshold;
- and
- in accordance with determining that an output from the transmitter exceeds the output threshold, perform a corrective action.
6 more elements
A transmitter for wirelessly transmitting power comprising:
- a power transmitting coil;
- and
- control circuitry coupled to the power transmitting coil configured to:
- receive a plurality of messages from a wireless power receiver, the plurality of messages allowing closed loop control of transmitter operation by the receiver;
- monitor error indicators from the plurality of messages, the error indicators representing a magnitude of a difference between a power need of the receiver and power provided by the transmitter;
- exert closed loop control of a wireless power transfer output level transmitted to the wireless power receiver based on at least some of the error indicators from the plurality of messages;
- in response to at least some of the error indicators from the plurality of messages indicating an equilibrium state in which the error indicators do not exceed a non-zero power error threshold, set an output slope threshold;
- and
- in accordance with determining that a rate of change of a transmitter output exceeds the output slope threshold, perform a corrective action.
6 more elements
A receiver for wireless power transfer comprising:
- a power receiving coil;
- and
- control circuitry coupled to the power receiving coil configured to:
- send a plurality of messages to a wireless power transmitter, the plurality of messages allowing closed loop control of transmitter operation by the receiver, each message including an error indicator, the error indicator representing a magnitude of a difference between a power need of the receiver and power provided by the transmitter;
- receive a wireless power transfer input level transmitted from the wireless power transmitter based on the error indicators;
- monitor the error indicators from the plurality of messages;
- determine whether the error indicators exceed a non-zero power error threshold for a threshold time, wherein the threshold time is less than a control error packet timeout of the transmitter, the control error packet timeout being selected to prevent shutdown of the transmitter because of lost communication with the receiver;
- and
- in accordance with determining that the error indicators exceed the non-zero power error threshold for the threshold time, perform a corrective action.
6 more elements
Dependencies are inferred from the claim text.