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Features
• Intelligent battery supply system
comprising CU 4000 charger and
BP 4000 battery pack
• Microprocessor controlled charge/
discharge monitoring function
• One-hour quick charging and Battery
Recovery Management
• Charging compartment allows battery
pack to be charged inside the
transmitter
CU 4000 / BP 4000
Description
The AKG charging system 4000 consists of the CU 4000 charging unit and the BP
4000 battery pack. The charging unit itself is a stand-alone unit in a rugged plastic
housing, featuring 2 charging compartments, each mechanically designed to hold
either one HT 4000 handheld transmitter, a PT 4000 bodypack transmitter or a BP
4000 spare battery pack.
Two battery packs can be charged simultaneously by the CU 4000, if the battery
pack is installed in either the HT 4000 or PT 4000 transmitters. There is no need
to remove the battery pack from the transmitters since these transmitters are equipped
with on- board charging contacts for a plug-in charge.
The sophisticated charging electronics of the CU 4000 comprises revolutionary
functions to carefully charge and service the BP 4000 battery packs over the full
lifetime of the battery.
The basic charging function is based on a trickle charge system with so-called inflection
point switch-off automation. Safety switch off occurs by detection of the peak voltage,
the negative voltage slope or a predetermined time out. Thus the battery pack is
prevented from overcharging. An integrated two-slot power management system allows
the Charging unit to charge two battery packs simultaneously in
approximately 1 hour.
Since the BP 4000 battery pack incorporates micro-
processor-controlled surveillance intelligence, there
is a permanent data stream between the Charging
Unit and the Battery Pack to protect the batteries
from any damage caused by the charging process.
A charge balance management circuit controls the
exact amount of energy to be charged in the pack
as the amount that was taken out of the pack (2nd
level overcharge protection). The charge balance
management also features a self-discharging counter
used to detect the exact battery pack status after a
long period of storage. With the help of this charge
balance management, an accurate remaining battery life
display can be realized on the transmitters (transferred via pilot
tone to the SR 4000 receiver).
All necessary battery pack data will be stored in the internal RAM or EPROM-
memory of the pack. All predetermined and initial parameters are stored in EPROM-
memory of the battery pack to perform a correct recovery cycle.
The battery pack also features an internal temperature surveillance circuit that adjusts
the charging current of the CU4000 to protect the device in case of low or high
temperature during loading.
To reduce the so-called memory effect which leads to decreasing battery capacity,
the communication between the BP 4000 and the CU 4000 is able to calculate if
the batteries need a recovery cycle by the help of the stored date in the BP 4000.
In this case, the CU 4000 draws the user’s attention to this possible problem and
suggests starting a recovery cycle. The user can activate the recovery cycle via a
recovery button on the CU 4000´s front panel. The recovery cycle refreshes the battery
pack by charging and discharging cycles to determine the actual capacity and initialize
the capacity counter for accurate use time calculation.
Other controls include a 3-step LED display showing the charging status. A lockable
DC connector on the rear panel of the CU allows the unit to be powered by either an
external DC adapter or by the optional PSU 4000 central power supply.
Due to the sophisticated charging system, the battery pack can power the HT 4000
and PT 4000 for up to 12 hours with one full charging cycle, plus its gentle charging
function will ensure up to 1,000 charging cycles.