WIRELESS INDUCTIVE POWER TRANSFER

摘要

An inductive power transfer system comprises a power transmitter (101) and a power receiver (105). The power transmission system supports two-way communications. The power receiver (105) first initiates a mandatory configuration phase by transmitting a signal strength package and the power transmitter and receiver then operates (505, 507) the mandatory configuration phase wherein a first set of power transfer operating parameters are selected for the power transmitter (101) and the power receiver (105). The power receiver (105) subsequently transmits (509) a request to enter a negotiation phase and the power transmitter (101) acknowledges (511) the request by transmitting an acknowledgement. It then enters the negotiation phase. The power receiver (105) enters the negotiation phase in response to receiving the acknowledgment message. The power receiver (105) and power transmitter (101) then determines (513, 515) a second set of operating parameters by performing the negotiation phase. The approach is particularly suitable for a Qi power transfer system.

主权项

1. A method of operation for an inductive power transfer system comprising a power transmitter arranged to generate a wireless power signal for a power receiver, the inductive power transfer system supporting two-way communication between the power transmitter and the power receiver based on modulation of the power signal, the method comprising:
initiating, by the power receiver, a mandatory configuration phase by transmitting a signal strength package to the power transmitter; wherein the power transmitter and the power receiver operate in the mandatory configuration phase, and a first set of power transfer operating parameters are selected for the power transmitter and the power receiver; transmitting, by the power receiver, a request to enter a requested negotiation phase; acknowledging, by the power transmitter, the request to enter the requested negotiation phase by transmitting an acknowledgement to the power receiver, the acknowledgement being indicative of an acceptance or a rejection of the request to enter the requested negotiation phase; entering, by the power transmitter, the requested negotiation phase in response to receiving the request to enter the requested negotiation phase; entering, by the power receiver, the requested negotiation phase in response to receiving the acknowledgment from the power transmitter if the acknowledgment is indicative of the acceptance of the request to enter the requested negotiation phase; determining, by the power receiver and power transmitter, a second set of operating parameters by performing the requested negotiation phase.