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System Description |
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Wireless Power Transfer |
System Control |
Version 1.1.1 |
5.2.2Identification & configuration phase
In the identification & configuration phase, the Power Transmitter shall identify the Power Receiver and collect configuration information. For this purpose, the Power Transmitter shall correctly receive the following sequence of Packets, in the order shown, and without changing its Operating Point:
If the Power Transmitter enters the identification & configuration phase from the ping phase, an Identification Packet.
If the Ext bit of the preceding Identification Packet is set to ONE, an Extended Identification Packet.
Up to 7 optional configuration Packets from the following set (the order in which the Power Transmitter receives these Packets, if any, is not relevant):
o A Power Control Hold-off Packet. If the Power Transmitter receives multiple Power Control Hold-off Packets, the Power Transmitter shall retain the Power Control Hold-off Time contained in the last Power Control Hold-off Packet received (see below).
oAny Proprietary Packet (as listed in Table 6-3). If the Power Transmitter does not know how to handle the message contained in the Proprietary Packet, the Power Transmitter shall ignore that message.
oAny reserved Packet (as indicated in Table 6-3). The Power Transmitter shall ignore the message contained in the reserved Packet.
A Configuration Packet. If the number of optional configuration Packets, which the Power Transmitter has received, is not equal to the value contained in the Count field of the
Configuration Packet, the Power Transmitter shall remove the Power Signal within ms after receiving the stop bit of the Configuration Packet’s checksum byte, and return to the selection phase.
The Power Transmitter shall receive the above sequence of Packets subject to the following timing constraints:
If the Power Transmitter does not detect the start bit of the header byte of a next Packet in the
sequence within the time interval |
after the end of the directly preceding Packet in the sequence, |
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the Power Transmitter shall remove the Power Signal within |
. See Figure 5-4(a). In this |
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context, the directly preceding Packet of the Identification Packet is the Signal Strength Packet, which the Power Transmitter has received in the ping phase. In addition, if the Power Transmitter has entered the identification & configuration phase from the power transfer phase, the directly preceding Packet of the first Packet in the sequence—either the Configuration Packet if the sequence does not contain optional configuration Packets, or the first optional configuration Packet—is the End Power Transfer Packet, which the Power Transmitter has received in the power transfer phase.
If the Power Transmitter does not correctly receive a Packet in the sequence within the time interval after the start of that Packet, the Power Transmitter shall remove the Power Signal within
. See Figure 5-4(b).
If the Power Transmitter correctly receives a next Packet that does not comply with the above
sequence, the Power Transmitter shall remove the Power Signal within |
after the end of that |
Packet. See Figure 5-4(c). |
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In addition to these timing constraints, if the Power Transmitter does not receive a Packet correctly (see Section 6.2.4), the Power Transmitter shall remove the Power Signal within after detecting the error.
After the Power Transmitter has received the Configuration Packet, the Power Transmitter shall execute the following steps, in the order shown:
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If the relation ( ) |
( ) is not satisfied, the Power Transmitter shall revert to the |
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selection phase. Moreover, if the Power Transmitter reverts to the selection phase, the Power |
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Transmitter shall remove the Power Signal within |
after the end of the Configuration |
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© Wireless Power Consortium, July 2012 |
System Description
Wireless Power Transfer
Version 1.1.1 |
System Control |
Packet. If the Power Transmitter has not received a Power Control Hold-off Packet, the Power |
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Transmitter shall proceed to use |
( ). |
If the Power Transmitter has correctly received all Packets in the sequence (see Figure 5-4(d)), the Power Transmitter may create a Power Transfer Contract. See below.
If the Power Transmitter has created a Power Transfer Contract, the Power Transmitter may proceed to the power transfer phase. If the Power Transmitter does not proceed to the power
transfer phase, the Power Transmitter shall remove the Power Signal within |
after the start |
of the Configuration Packet. See Figure 5-4(e) |
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If the Power Transmitter has removed the Power Signal—and does not proceed to the power transfer phase—the Power Transmitter shall revert to the selection phase.
tnext |
tterminate |
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(a) |
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Preceding Packet |
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tnext |
tmax |
tterminate |
(b) |
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Preceding Packet |
Next Packet |
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tnext |
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tterminate |
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Preceding Packet |
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tmax |
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tnext |
tmax |
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Preceding Packet |
Next Packet |
tmax |
Configuration |
tnext |
texpire |
(e) |
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Preceding Packet |
Configuration |
Figure 5-4: Power Transmitter timing in the identification & configuration phase
© Wireless Power Consortium, July 2012 |
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Wireless Power Transfer |
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System Control |
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Version 1.1.1 |
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Table 5-2: Power Transmitter timing in the identification & configuration phase |
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Parameter |
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Minimum |
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Target |
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Maximum |
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Next Packet time out |
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ms |
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Maximum Packet length |
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N.A. |
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ms |
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Table 5-3: Power control hold-off time |
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Parameter |
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Power Control Hold-off Time |
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Power Control Hold-off Time |
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Based on the configuration information received from the Power Receiver, the Power Transmitter can create a Power Transfer Contract. This version 1.1.1 of the System Description Wireless Power Transfer, Volume I, Part 1, does not define the parameters that comprise a Power Transfer Contract. However, it is recommended that the Power Transfer Contract contains at least the following parameters:
The maximum power that the Power Receiver intends to provide at its output (as obtained from the Maximum Power field of the Configuration Packet).
5.2.3Power transfer phase
In the power transfer phase, the Power Transmitter controls the power transfer to the Power Receiver, in response to control data that it receives from the latter. For this purpose, the Power Transmitter shall receive zero or more of the following Packets:
Control Error Packet.
Received Power Packet.
Charge Status Packet.
End Power Transfer Packet.
Any Proprietary Packet (as listed in Table 6-3). If the Power Transmitter does not know how to handle the message contained in the Proprietary Packet, the Power Transmitter shall ignore that message.
Any reserved Packet (as indicated in Table 6-3). The Power Transmitter shall ignore the message contained in the reserved Packet.
The Power Transmitter shall receive the above Packets subject to the following timing constraints:
If the Power Transmitter does not correctly receive the start of the first Control Error Packet
within the time window after the start of the Configuration Packet, which the Power Transmitter has received in the identification & configuration phase, the Power Transmitter shall
remove the Power Signal within |
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start of a Control Error Packet within the time window |
after the start of the preceding |
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Control Error Packet, the Power Transmitter shall remove the Power Signal within |
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Figure 5-5(a). |
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If the Power Transmitter does not correctly receive the start of the first Received Power Packet
within the time window |
after the start of the Configuration Packet, which the Power |
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Transmitter has received in the identification & configuration phase, the Power Transmitter shall |
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remove the Power Signal within |
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start of a Received Power Packet within the time window |
after the start of the preceding |
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Received Power Packet, the Power Transmitter shall remove the Power Signal within |
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See Figure 5-5 (f). |
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© Wireless Power Consortium, July 2012 |
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System Description |
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Wireless Power Transfer |
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Version 1.1.1 |
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System Control |
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ttimeout |
tterminate |
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Control Error |
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ttimeout |
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tdelay |
tsettle |
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Next Control Error |
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Preceding Control Error |
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tactive |
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tterminate |
(c) |
tdelay |
tsettle |
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Preceding Control Error |
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tactive |
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tdelay |
tsettle |
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End Power Transfer
Preceding Control Error
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tterminate |
(e) |
tdelay |
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End Power Transfer |
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Preceding Control Error |
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tactive |
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tpower |
tterminate |
(f) |
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Received Power |
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Figure 5-5: Power Transmitter timing in the power transfer phase
Table 5-4: Power Transmitter timing in the power transfer phase
Parameter |
Symbol |
Minimum |
Target |
Maximum |
Unit |
Control Error Packet time out |
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N.A. |
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Power control active time |
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Power control settling time |
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Received Power Packet time |
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N.A. |
23000 |
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© Wireless Power Consortium, July 2012 |
77 |
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System Description |
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Wireless Power Transfer |
System Control |
Version 1.1.1 |
In addition to the above timing constraints, the Power Transmitter shall execute the following actions:
Upon receiving a Control Error Value, the Power Transmitter shall adjust its Operating Point, as
defined in Section 5.2.3.1, during a time window Power Transmitter shall wait for an interval
again after communications. See Figure 5-5 (b).
. Prior to making any adjustment, the to enable the Primary Cell current to stabilize
If the Power Transmitter correctly receives a Packet that does not comply with the above
sequence, the Power Transmitter shall remove the Power Signal within |
after the end of |
that Packet. See Figure 5-5 (c). |
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If the Power Transmitter receives an End Power Transfer Packet, the Power Transmitter shall:
oRevert to the identification & configuration phase without changing its Operating Point, if the End Power Transfer Code is 0x07 (reconfigure). See Figure 5-5 (d).
o Remove the Power Signal within after the end of the End Power Transfer Packet, if the End Power Transfer Code has any other value than 0x07. See Figure 5-5 (e).
The Power Transmitter shall monitor the parameters contained in the Power Transfer Contract throughout the power transfer phase. If the Power Transmitter detects that the actual value of
any of those parameters exceeds the limits contained in the Power Transfer Contract, the Power Transmitter shall remove the Power Signal within .
If the Power Transmitter has removed the Power Signal, the Power Transmitter shall revert to the selection phase.
5.2.3.1Power transfer control
This version 1.1.1 of the System Description Wireless Power Transfer, Volume I, Part 1, defines a specific method, which the Power Transmitter shall use to control its Primary Cell current towards the new Primary Cell current (see also Section 5.1). This method is based on a discrete proportional-integral- differential (PID) algorithm as illustrated in Figure 5-6.
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Control Error |
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Message |
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( , ) |
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Conversion Unit |
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Transmitter |
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Figure 5-6: PID control algorithm
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© Wireless Power Consortium, July 2012 |