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

[Piotr Esden-Tempski]

Hi Alonso,

I finally found a bit of time to draw more wiring diagrams. I have added the 
diagram showing PWM ESC's and dedicated BEC wiring option:
http://wiki.paparazziuav.org/wiki/Lisa/M_v2.0#Quadrocopter.2C_Spektrum_Satellite_Receivers.2C_PWM_Motor_Controllers_.28ESC.29_and_dedicated_avionics_Battery_Elimination_Circuit_.28BEC.29

As well as the shunt balancing option you are asking about. It is the second 
diagram in the section:
http://wiki.paparazziuav.org/wiki/Lisa/M_v2.0#Quadrocopter.2C_Spektrum_Satellite_Receivers_and_PWM_Motor_Controllers_.28ESC.29

I hope this helps. And as I mentioned before, the Dedicated BEC option is the 
one I would recommend.

Cheers,
Piotr

On Jun 2, 2014, at 12:52, alonso acuña <address@hidden> wrote:

> 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.
> 
> 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
> >
> > _______________________________________________
> > Paparazzi-devel mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> 
> 
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