Power Sink Example
As a followup to Mike M.'s suggestion that we attempt to compile some
data on power sinks prior to the York meeting, I 'll start off with the
following
contribution with respect to our iP Phone.
Looking into the iP Phone the LAN will see a full-wave bridge followed
by a shunt capacitance of between 100uF and 200uF. No inrush current limiting
should be assumed. The capacitance provides local energy storage for a
switching power supply which is capable of functioning with a source voltage
of between 30VDC and 60VDC. The phone load will be about 3W maximum
and , due to the switching power supply, will present a constant power (negative
resistance) characteristic.
Hopefully we'll have sufficient contributions to make some good progress
on the PAR in York.
Regards,
Scott Burton
Design Engineer
Mitel Corporation
Kanata, Ontario, Canada
TEL: 613-592-2122
FAX: 613-592-4784
scott_burton@xxxxxxxxx
www.mitel.com