Re: [Paparazzi-devel] powering lisa/m v2

[Piotr Esden-Tempski]

Hi Oswald,

Definitely using a separate UBEC is the best/most robust solution, unless you 
can not afford the weight or cost of such. Also in most cases the most 
efficient one as the UBECs tend to be switching voltage regulators, vs the ones 
built into ESCs are generally linear regulators.

If you want to power the lisa from more then one ESC built in BEC you can add 
shunt resistors in line of the supply lines. Generally 1 OHM should do the job. 
I used that solution in the past and it decreased the balancing issues 
significantly.

Regarding your IMU issues. Most likely you were getting EMI injection through 
the power lines of the ESCs, again in that situation the best solution is to 
use an external UBEC.

Cheers,
Piotr

On Jun 1, 2014, at 14:33, Oswald Berthold <address@hidden> wrote:

> 
> hi all again,
> 
> a question about powering lisa/m v2. if powering via the servo 5V rail,
> it is suggested in [1] to connect all (e.g. 4) servos (ESCs) to
> signal/5V/gnd. isn't that supposed to induce differential lateral
> currents among the individual BECs or is that somehow prevented?
> 
> i was anyway powering from only one ESC, which seemed insufficient for
> all of lisa and the periphery. i think i've seen some weird IMU outages
> due to this, the ESC got quite hot too. now using a separate UBEC.
> 
> bst, oswald
> 
> 
> [1] 
> http://wiki.paparazziuav.org/wiki/Lisa/M_v2.0#Quadrocopter.2C_Spektrum_Satellite_Receivers_and_PWM_Motor_Controllers_.28ESC.29
> 
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