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Transmitter
W
C
IRELESS
HARGING
Power transfer from a Power Transmitter to a Power Receiver comprises four phases, namely selection,
ping, identification & configuration, and power transfer. The diagram below illustrates the relation between
the phases. The solid arrows indicate transitions, which the Power Transmitter initiates; and the dotted
arrows indicate transitions that the Power Receiver initiates. By definition, if the Power Transmitter is not
applying a Power Signal, the system is in the selection phase. This means that a transition from any of
the other phases to the selection phase involves the Power Transmitter removing the Power Signal.
selection
The main activity in each of these phases is described below.
Selection
In this phase, the Power Transmitter typically monitors the Interface Surface for the placement and
removal of objects. The Power Transmitter attempts to differentiate between Power Receivers and
Foreign Objects —keys, coins, etc. If the Power Transmitter detects the possible presence of a receiver,
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No portion of this document may be reproduced or reused in any form without Active-Semi's prior written consent
O
VERVIEW
apply Power Signal
no response -
abort Digital Ping
power transfer
complete
no Power Transfer Contract
unexpected Packet
transmission error
time-out
Power Transfer Contract
violation unexpected
Packet time-out
power transfer
complete
PAC5220WP A11 WPC
Power Application Controller
ping
extend Digital Ping
identification and
configuration
Power Transfer
Reconfigure
Contract established
power transfer
- 7
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Rev 1.7 May, 2014
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