Switch-mode BEC with Lithium Cutoff
The SmartBEC adds the benefits of a switching BEC and a lithium-aware
LVC to your flight system. It is a great choice for anyone looking to
upgrade their non-lithium aware system to use higher voltage lithium
SmartBEC features a soft lithium cutoff,
so you don’t have to worry about making an emergency
dead-stick landing. When the battery is nearly depleted, the power
output of the motor is progressively scaled down. Once the plane begins
to feel sluggish, its time to set up for a landing.
SmartBEC uses a switching type power supply to efficiently
convert high pack voltages into the 5v your receiver and radio gear
needs. A switching BEC does not become grossly inefficient when used
from high voltage sources. Because of this you will not need to fear
losing radio power from a BEC shutdown. Adding a SmartBEC will allow
you to stop carrying around a second receiver battery, often saving
several ounces of weight. SmartBEC supports up to four standard servos
or six sub-micro servos, so the majority of sport and parkflyer type
aircraft are suitable. It puts out almost no EMI, so you can use it
without fear of glitching.
The SmartBEC installs between your ESC and receiver, so you don't have
to modify your speed control to disable its internal BEC, just plug it
in. SmartBEC works by modifying the throttle commands sent to the ESC,
so if the ESC has low voltage cutoff settings, they will still be
active. Whichever LVC occurs first (ESC or SmartBEC) will take
SmartBEC automatically detects the number of series lithium
cells, and displays this information by flashing a light. After
connecting the battery and prior to flying, make sure that the SmartBEC
has detected the correct number of cells. If the battery is in a
severely discharged state, the SmartBEC may detect the incorrect number
of cells. If the number of cells displayed by the SmartBEC is less than
the number of cells in the battery, DO NOT attempt to fly as this may
damage your battery pack. Instead, fully charge the battery before
is a small video of a SmartBEC that has detected a four cell (4s) pack.
As a safety precaution, SmartBEC will not arm the ESC for pack voltages
lower than 9V or higher than 34V.
SmartBEC is not directly compatible with opto-isolated
ESCs. A small modification is required (see below).
For best results, ensure that the SmartBEC is installed at least 2
inches away from your receiver.