DPSI RV Mini Family Operating Instructions Version 1.0
Page 14 of 54
5.3. Detached Voltage Regulators
Until now, the receiver set was supplied directly by the connected
battery (or corresponding battery switch). The output voltage of
batteries depends heavily on the actual discharging state. Because 5-
cell NiCd or NiMH batteries are utilized more often for optimal servo
power, a fully charged battery reaches voltages up to 7.5V after turning
the charger off. Although this peak voltage usually drops quickly it can
shorten the life cycle of servos in adverse cases because servos
usually are approved only for 6V by the manufacturer. Due to
increased usage of light weight Lithium Polymer batteries voltage
regulation is mandatory because these batteries carry a nominal
voltage of 7.4V.
The electronics in the DPSI RV Mini make sure that the voltage is
reduced to a permissible value, independent of the higher input voltage
of the battery. Jumper (small pluggable bridges) allow for selection of
the desired output voltage. This way, the power requirements can be
adapted to the pilot needs and technical data of the servos.
As a specialty, two separate voltage regulators are built into the DPSI
RV Mini each having its own selectable output voltage. Servos directly
connected to the DPSI are supplied by their own voltage regulator. Its
output voltage is either 5.9V or battery voltage. This means: the servos
are supplied either with a regulated 5.9V (regular permissible voltage)
or directly with the (unregulated) battery voltage. Later is about 7.4V for
2-cell LiPo batteries. Some servos can be supplied with this higher
voltage already.
A receiver connected to the DPSI RV Mini is supplied by its own
voltage regulator. This is very advantageous and gains safety
significantly.
The output voltage of the receiver can be set between 5.2V and 5.9V.
Besides direct connections of high power servos the concept of the
DPSI RV Mini allows for connection of additional low power servos to
the receiver (e.g. a throttle servo), where 5.2V normally suffice.
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