M2TECH Palmer - Manual (Page 9)

PALMER POWER STATION
LOW NOISE BATTERY POWER SUPPLY/CHARGER
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
9
M2Tech
www.m2tech.biz
5. Operation
5.1. Charge policy
Charge is activated whenever one of the following events occur:
a) the unit is powered, the battery is in use and the battery voltage falls below the low
battery limit;
b) the unit is off (mains switch released, Page 6 no.1), the output switch is on and the unit
is powered by pushing the mains switch.
When the unit gets powered with the outputs enabled, chances are that the battery has
been previously used down to the full capacity, so a charge cycle needs to be started.
User may use this to start a charge at any time by just powering the unit with the outputs
enabled.
On the other hand, powering the unit with the outputs disabled puts the unit in a “charge
idle” status in which a charge is only activated when the battery is depleted.
5.2. Forced battery operation
As stated in paragraph 5.1., the PALMER POWER STATION initiates a charge cycle every time
the battery voltage reaches the low battery level while the unit is powered. When the
charge is in progress, the low-noise post-regulator is fed by a pre-regulator to ensure
uninterrupted operation of the unit(s) connected to the PALMER POWER STATION output(s).
User may prefer not to have the charge started before ending the listening session, thus
using all the safe battery capacity. This is achieved by simply switching the PALMER POWER
STATION off. The battery will feed the post-regulator even when its voltage falls below the
low battery threshold, down to a safety depletion level. When this depletion level is
reached, a protection circuit will disable the output, totally isolating the battery and
avoiding any further depletion which may damage it.
5.3. Battery safety and life duration
The Li-Po battery used inside the PALMER POWER STATION is a very high quality unit, with
long life and high surge current. To avoid damaging it, protections are included in the
PALMER POWER STATION circuit, as well as inside the battery itself.
The battery is protected against:
a) undervoltage (depletion);
b) overvoltage due to charge circuit faults;
c) overcurrent, by both the internal circuit and a resettable polyswitch fuse.