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

From: alonso acuña
Subject: Re: [Paparazzi-devel] powering lisa/m v2
Date: Mon, 2 Jun 2014 13:52:36 -0600

Hello Piotr, could you please point me to more details about how to connect more than one ESC built in BEC to power redundance to the Lisa/M ? I did not understand how or where the resistor should be connected.   

On Sun, Jun 1, 2014 at 3:42 PM, Piotr Esden-Tempski <address@hidden> wrote:
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.


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]
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